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1

Extended Boussinesq equations for rapidly varying topography  

Microsoft Academic Search

We developed a new Boussinesq-type model which extends the equations of Madsen and Sørensen [1992. A new form of the Boussinesq equations with improved linear dispersion characteristics. Part 2. A slowly varying bathymetry. Coastal Engineering 18, 183–204.] by including both bottom curvature and squared bottom slope terms. Numerical experiments were conducted for wave reflection from the Booij's [1983. A note

Gunwoo Kim; Changhoon Lee; Kyung-Duck Suh

2009-01-01

2

Optimal color temperature adjustment for mobile devices under varying illuminants  

NASA Astrophysics Data System (ADS)

With the wide use of mobile devices, display color reproduction has become extremely important. The purpose of this study is to investigate the optimal color temperature for mobile displays under varying illuminants. The effect of the color temperature and the illuminance of ambient lighting on user preferences were observed. For a visual examination, a total of 19 nuanced whites were examined under 20 illuminants. A total of 19 display stimuli with different color temperatures (2,500 K ~ 19,600 K) were presented on an iPad3 (New iPad). The ambient illuminants ranged in color temperature from 2,500 K to 19,800 K and from 0 lx to 3,000 lx in illuminance. Supporting previous studies of color reproduction, there was found to be a positive correlation between the color temperature of illuminants and that of optimal whites. However, the relationship was not linear. Based on assessments by 56 subjects, a regression equation was derived to predict the optimal color temperature adjustment under varying illuminants, as follows: [Display Tcp = 5138.93 log(Illuminant Tcp) - 11956.59, p<.001, R2=0.94]. Moreover, the influence of an illuminant was positively correlated with the illuminance level, confirming the findings of previous studies. It is expected that the findings of this study can be used as the theoretical basis when designing a color strategy for mobile display devices.

Choi, Kyungah; Suk, Hyeon-Jeong

2014-01-01

3

Time-varying human mobility patterns with metapopulation epidemic dynamics  

NASA Astrophysics Data System (ADS)

In this paper, explicitly considering the influences of an epidemic outbreak on human travel, a time-varying human mobility pattern is introduced to model the time variation of global human travel. The impacts of the pattern on epidemic dynamics in heterogeneous metapopulation networks, wherein each node represents a subpopulation with any number of individuals, are investigated by using a mean-field approach. The results show that the pattern does not alter the epidemic threshold, but can slightly lower the final average density of infected individuals as a whole. More importantly, we also find that the pattern produces different impacts on nodes with different degree, and that there exists a critical degree kc. For nodes with degree smaller than kc, the pattern produces a positive impact on epidemic mitigation; conversely, for nodes with degree larger than kc, the pattern produces a negative impact on epidemic mitigation.

Gong, Yong-Wang; Song, Yu-Rong; Jiang, Guo-Ping

2013-10-01

4

Computation of rapidly varied unsteady, free-surface flow  

USGS Publications Warehouse

Many unsteady flows in hydraulics occur with relatively large gradients in free surface profiles. The assumption of hydrostatic pressure distribution with depth is no longer valid. These are rapidly-varied unsteady flows (RVF) of classical hydraulics and also encompass short wave propagation of coastal hydraulics. The purpose of this report is to present an introductory review of the Boussinnesq-type differential equations that describe these flows and to discuss methods for their numerical integration. On variable slopes and for large scale (finite-amplitude) disturbances, three independent derivational methods all gave differences in the motion equation for higher order terms. The importance of these higher-order terms for riverine applications must be determined by numerical experiments. Care must be taken in selection of the appropriate finite-difference scheme to minimize truncation error effects and the possibility of diverging (double mode) numerical solutions. It is recommended that practical hydraulics cases be established and tested numerically to demonstrate the order of differences in solution with those obtained from the long wave equations of St. Venant. (USGS)

Basco, D. R.

1987-01-01

5

Error eliminating rapid ultrasonic firing for mobile robot obstacle avoidance  

Microsoft Academic Search

This paper introduces error eliminating rapid ultrasonic firing (EERUF), a new method for firing multiple ultrasonic sensors in mobile robot applications. EERUF allows ultrasonic sensors to fire at rates that are five to ten times faster than those customary in conventional applications. This is possible because EERUF reduces the number of erroneous readings due to ultrasonic noise by one to

Johann Borenstein; Yoram Koren

1995-01-01

6

Asymptotic analysis of deterministic and stochastic equations with rapidly varying components  

Microsoft Academic Search

The asymptotic character of deterministic and stochastic equations whose solutions have a rapidly varying component is studied. Of particular interest is the class of problems for which the limiting behavior can be described in a contracted and simplified framework.

George C. Papanicolaou; Werner Kohler

1975-01-01

7

A Synchronization Approach to Trajectory Tracking of Multiple Mobile Robots While Maintaining Time-Varying Formations  

Microsoft Academic Search

In this paper, we present a synchronization approach to trajectory tracking of multiple mobile robots while maintaining time-varying formations. The main idea is to control each robot to track its desired trajectory while synchronizing its motion with those of other robots to keep relative kinematics relationships, as required by the formation. First, we pose the formation-control problem as a synchronization

Dong Sun; Can Wang; Wen Shang; Gang Feng

2009-01-01

8

Rapid Prototyping of Mobile Input Devices Using Wireless Sensor Nodes  

Microsoft Academic Search

Many options exist for prototyping software-based human-computer interfaces, but there are few compa- rable technologies that allows application developers to create ad-hoc hardware interfaces with correspond- ing ease and flexibility. In this paper, we present a system for rapidly constructing low cost prototypes of mobile in- put devices by leveraging wireless sensor nodes. We demonstrate two proof-of-concept applications-a conduc- tor's

James Carlson; Richard Han; Shandong Lao; Chaitanya Narayan; Sagar Sanghani

2003-01-01

9

Time-varying Feedback Stabilization of Car-like Wheeled Mobile Robots  

Microsoft Academic Search

Many nonholonomic mechanical systems, such as common wheeled mobile robots, are controllable but cannot be stabilized to given positions and orientations bv using smooth pure-state feedback control. However, as shown in Samson (1990), such systems may still be stabilized by using smooth time-varying feedbacks,—i.e., feedbacks that explicitly depend on the time variable. This possibility is here applied to the stabilization

Claude Samson

1993-01-01

10

Patterns and dynamics of rapid local adaptation and sex in varying habitat types in rotifers.  

PubMed

Local adaptation is an important principle in a world of environmental change and might be critical for species persistence. We tested the hypothesis that replicated populations can attain rapid local adaptation under two varying laboratory environments. Clonal subpopulations of the cyclically parthenogenetic rotifer Brachionus calyciflorus were allowed to adapt to two varying harsh and a benign environment: a high-salt, a food-limited environment and untreated culture medium (no salt addition, high food). In contrast to most previous studies, we re-adjusted rotifer density to a fixed value (two individuals per ml) every 3-4 days of unrestricted population growth, instead of exchanging a fixed proportion of the culture medium. Thus our dilution regime specifically selected for high population growth during the entire experiment and it allowed us to continuously track changes in fitness (i.e., maximum population growth under the prevailing conditions) in each population. After 56 days (43 asexual and eight sexual generations) of selection, the populations in the harsh environments showed a significant increase in fitness over time relative to the beginning compared to the population in untreated culture medium. Furthermore, the high-salt population exhibited a significantly elevated ratio of sexual offspring from the start of the experiment, which suggested that this environment either triggered higher rates of sex or that the untreated medium and the food-limited environment suppressed sex. In a following assay of local adaptation we measured population fitness under "local" versus "foreign" conditions (populations adapted to this environment compared to those of the other environment) for both harsh habitats. We found significantly higher fitness values for the local populations (on average, a 38% higher fitness) compared to the foreign populations. Overall, local adaptation was formed rapidly and it seemed to be more pronounced in the high-salt treatment. PMID:24324875

Scheuerl, Thomas; Stelzer, Claus-Peter

2013-10-01

11

Patterns and dynamics of rapid local adaptation and sex in varying habitat types in rotifers  

PubMed Central

Local adaptation is an important principle in a world of environmental change and might be critical for species persistence. We tested the hypothesis that replicated populations can attain rapid local adaptation under two varying laboratory environments. Clonal subpopulations of the cyclically parthenogenetic rotifer Brachionus calyciflorus were allowed to adapt to two varying harsh and a benign environment: a high-salt, a food-limited environment and untreated culture medium (no salt addition, high food). In contrast to most previous studies, we re-adjusted rotifer density to a fixed value (two individuals per ml) every 3–4 days of unrestricted population growth, instead of exchanging a fixed proportion of the culture medium. Thus our dilution regime specifically selected for high population growth during the entire experiment and it allowed us to continuously track changes in fitness (i.e., maximum population growth under the prevailing conditions) in each population. After 56 days (43 asexual and eight sexual generations) of selection, the populations in the harsh environments showed a significant increase in fitness over time relative to the beginning compared to the population in untreated culture medium. Furthermore, the high-salt population exhibited a significantly elevated ratio of sexual offspring from the start of the experiment, which suggested that this environment either triggered higher rates of sex or that the untreated medium and the food-limited environment suppressed sex. In a following assay of local adaptation we measured population fitness under “local” versus “foreign” conditions (populations adapted to this environment compared to those of the other environment) for both harsh habitats. We found significantly higher fitness values for the local populations (on average, a 38% higher fitness) compared to the foreign populations. Overall, local adaptation was formed rapidly and it seemed to be more pronounced in the high-salt treatment.

Scheuerl, Thomas; Stelzer, Claus-Peter

2013-01-01

12

Rapid Prototyping a Collections-based Mobile Wayfinding Application  

Microsoft Academic Search

This research presents the results of a project that investigated how students use a library developed mobile app to locate books in the library. The study employed a methodology of formative evaluation so that the development of the mobile app would be informed by user preferences for next generation wayfinding systems. A key finding is the importance of gathering ongoing

Jim Hahn; Alaina Morales

2011-01-01

13

Rapid Prototyping a Collections-Based Mobile Wayfinding Application  

ERIC Educational Resources Information Center

This research presents the results of a project that investigated how students use a library developed mobile app to locate books in the library. The study employed a methodology of formative evaluation so that the development of the mobile app would be informed by user preferences for next generation wayfinding systems. A key finding is the…

Hahn, Jim; Morales, Alaina

2011-01-01

14

Is bigger really better? Comparison of rapid decompression experiments using varying sample sizes  

NASA Astrophysics Data System (ADS)

Rapid decompression of pressurized volcanic systems is one of the key factors causing explosive eruptions. During eruption, the mixture of melt, crystals and bubbles comprising the magma in the conduit is exposed to high strain rates. If the strain rate approaches the structural relaxation time of the melt, brittle fragmentation will occur. The rate of decompression controls the strain rate and thereby determines whether an explosive event is triggered. Several studies have investigated rapid decompression of natural volcanic rocks using sample sizes ranging from 17 mm to 26 mm diameter. This increase in sample size enables the use of samples containing elements such as vesicles and phenocrysts of order of a few mm in size. For samples with larger phenocrysts, the experimental response of samples of this size range to rapid decompression is significantly compromised by the behaviour of these large crystals. However, large phenocrysts and particularly large vesicles are quite common in volcanic rocks. Thus, to cope with these samples experimentally, we developed an experimental set-up that enables the use of sample diameters up to 60 mm. Comparison to the results from smaller samples sizes allows us to evaluate the impact of boundary conditions and sample size itself on fragmentation behaviour (threshold, speed and efficiency). We performed experiments on samples from Lipari (Italy), Mt.Merapi (Indonesia) and Mt.Yasur (Vanuatu) that cover a large range in connected porosity, namely 18 - 78 %. All rapid decompression experiments were conducted at room temperature in a pressure range from 2 - 10 MPa. In a first series of experiments we analysed the fragmentation threshold, in a second series we determined fragmentation speed and grain-size distribution for each experiment. Additionally, we were able to estimate the velocity of the particles ejected after fragmentation using a high-speed camera. The results are discussed in the light of data from recent studies using smaller sample diameters. Further we evaluate the influence of varying decompression rates on the experiments. Finally we apply an energy budget model providing a link between the fragmentation process and the particle velocity.

Kremers, S. B.; Barsu, S.; Scheu, B.; Dingwell, D. B.

2011-12-01

15

Controlling mobility via rapidly oscillating time-periodic stimulus  

NASA Astrophysics Data System (ADS)

To address the dynamics of a Brownian particle on a periodic symmetric substrate under high-frequency periodic forcing with a vanishing time average, we construct an effective Langevin dynamics by invoking Kapitza-Landau time window. Our result is then exploited to simulate the mobility both for original and effective dynamics which are in good agreement with theoretical predictions. This close agreement and the enhancement of mobility are very robust against the tailoring of amplitude-to-frequency ratio which substantiates the correctness of our calculation. Present results may be illuminating for understanding the dynamics of cold atoms in electromagnetic fields.

Sarkar, Prasun; Maity, Alok Kumar; Shit, Anindita; Chattopadhyay, Sudip; Chaudhuri, Jyotipratim Ray; Banik, Suman K.

2014-05-01

16

Rapid reconstruction of small objects on mobile phones  

Microsoft Academic Search

Augmented Reality (AR) on mobile phones is receiving more and more attention recently, becoming a popular research topic and an important commercial field. In this paper we present a lightweight method to create coarse 3D models of small-scale objects. The goal is to give the users the possibility to create and maintain AR content themselves without the need for expensive

Andreas Hartl; Lukas Gruber; Clemens Arth; Stefan Hauswiesner; Dieter Schmalstieg

2011-01-01

17

Integrating rapid risk mapping and mobile phone call record data for strategic malaria elimination planning  

PubMed Central

Background As successful malaria control programmes re-orientate towards elimination, the identification of transmission foci, targeting of attack measures to high-risk areas and management of importation risk become high priorities. When resources are limited and transmission is varying seasonally, approaches that can rapidly prioritize areas for surveillance and control can be valuable, and the most appropriate attack measure for a particular location is likely to differ depending on whether it exports or imports malaria infections. Methods/Results Here, using the example of Namibia, a method for targeting of interventions using surveillance data, satellite imagery, and mobile phone call records to support elimination planning is described. One year of aggregated movement patterns for over a million people across Namibia are analyzed, and linked with case-based risk maps built on satellite imagery. By combining case-data and movement, the way human population movements connect transmission risk areas is demonstrated. Communities that were strongly connected by relatively higher levels of movement were then identified, and net export and import of travellers and infection risks by region were quantified. These maps can aid the design of targeted interventions to maximally reduce the number of cases exported to other regions while employing appropriate interventions to manage risk in places that import them. Conclusions The approaches presented can be rapidly updated and used to identify where active surveillance for both local and imported cases should be increased, which regions would benefit from coordinating efforts, and how spatially progressive elimination plans can be designed. With improvements in surveillance systems linked to improved diagnosis of malaria, detailed satellite imagery being readily available and mobile phone usage data continually being collected by network providers, the potential exists to make operational use of such valuable, complimentary and contemporary datasets on an ongoing basis in infectious disease control and elimination.

2014-01-01

18

Robust adaptive control of linear discrete-time systems with rapidly-varying parameters  

Microsoft Academic Search

In this paper an indirect adaptive regulator is constructed for single-input single-output linear time-varying discrete-time systems. The plant parameters are modeled as a linear combination of known bounded functions which may be fast varying with unknown slowly-varying coefficients that are confined to a convex set. The unknown coefficients are estimated using a gradient type estimator with a projection operation. It

A. Jerbi; E. W. Kaineii; J. F. Dorsey

1994-01-01

19

Simulation of rapid startup in microwave magnetrons with azimuthally-varying axial magnetic fields  

Microsoft Academic Search

Recent experiments have shown that the sidebands and the close-in noise in a microwave oven magnetron may be virtually eliminated by the addition of an azimuthally varying axial magnetic field. Not only the low noise behavior was observed, but also the startup was found to be substantially hastened when the number of the perturbing magnets equals the number of electron

M. C. Jones; V. B. Neculaes; W. White; Y. Y. Lau; R. M. Gilgenbach; J. Luginsland; P. Pengvanich; N. M. Jordan; Y. Hidaka; H. Bosman

2004-01-01

20

Detection of Rapidly Varying H 2 Emissions in Jupiter's Aurora from the Galileo Orbiter  

Microsoft Academic Search

H2 band emissions in Jupiter's northern auroral region at 1240 Å were highly variable on time scales of a few seconds in Galileo ultraviolet spectrometer (UVS) recorded data from November 5, 1996 (7:25:29 to 7:34:30 spacecraft event time (SCET)) during orbit Callisto-3 (C3). Emission at 1611 Å varied in phase with 1240 Å emission, but was much weaker. The 1240

Wayne R. Pryor; A. Ian F. Stewart; Karen E. Simmons; Joseph M. Ajello; W. Kent Tobiska; John T. Clarke; G. Randy Gladstone

2001-01-01

21

Immersive video as a rapid prototyping and evaluation tool for mobile and ambient applications  

Microsoft Academic Search

A key issue in mobile and ambient computing is the effort required to rapidly prototype and evaluate user interfaces and applications. Existing technologies for these tasks suffer either from low fidelity (e.g. paper prototypes, mental walkthroughs) or effectively require a near full-scale deployment. We propose an approach using immersive video with surround sound and a simulated infrastructure to create a

Pushpendra Singh; Hai Nam Ha; Zhiwen Kwang; Patrick Olivier; Christian Kray; Phil Blythe; Phil James

2006-01-01

22

Rapidly varying A-type stars in the SuperWASP archive  

NASA Astrophysics Data System (ADS)

The searches for transiting exoplanets have produced a vast amount of time-resolved photometric data of many millions of stars. One of the leading ground-based surveys is the SuperWASP project. We present the initial results of a survey of over 1.5 million A-type stars in the search for high frequency pulsations using SuperWASP photometry. We are able to detect pulsations down to the 0.5 mmag level in the broad-band photometry. This has enabled the discovery of several rapidly oscillating Ap stars and over 200 ? Scuti stars with frequencies above 50 d-1, and at least one pulsating sdB star. Such a large number of results allows us to statistically study the frequency overlap between roAp and ? Scuti stars and probe to higher frequency regimes with existing data.

Holdsworth, Daniel L.; Smalley, Barry

2014-02-01

23

Charged particle motion in electromagnetic fields varying moderately rapidly in space  

SciTech Connect

Electromagnetic fields are considered which vary on the space scale of the geometric mean of the Larmor radius and the much larger scale length of variation of the magnetic field lines. It is first shown that the magnetic moment is an adiabatic invariant, even though the usual arguments for its existence fail. The motion of the guiding center is then examined. For perpendicular drifts in magnitude comparable with the particle speed, the subsequent motion is dominated by electrostatic effects. The motion of particles along the field lines occurs on a much slower time scale than the perpendicular drift time scale. When the guiding center motion is approximately periodic in time, a second adiabatic invariant exists, the magnetic flux enclosed by the almost periodic orbit. When the perpendicular drift is small compared with the particle speed, the parallel motion and the perpendicular drift occur on the same, slow timescale.

Jagannath, Aukosh; Weitzner, Harold [Courant Institute of Mathematical Sciences, New York University, New York, New York 10012 (United States)

2011-10-15

24

Fast-responder: Rapid mobile-phone access to recent remote sensing imagery for first responders  

NASA Astrophysics Data System (ADS)

We introduce Fast-Responder, a novel prototype data-dissemination application and architecture concept to rapidly deliver remote sensing imagery to smartphones to enable situational awareness. The architecture implements a Fast-Earth image caching system on the phone and interacts with a Fast-Earth server. Prototype evaluation successfully demonstrated that National Guard users could select a location, download multiple remote sensing images, and flicker between images, all in less than a minute on a 3G mobile commercial link. The Fast-Responder architecture is a significant advance that is designed to meet the needs of mobile users, such as National Guard response units, to rapidly access information during a crisis, such as a natural or man-made disaster. This paper focuses on the architecture design and advanced user interface concepts for small-screens for highly active mobile users. Novel Fast-Responder concepts can also enable rapid dissemination and evaluation of imagery on the desktop, opening new technology horizons for both desktop and mobile users.

Talbot, L. M.; Talbot, B. G.

25

Rapid mobilization of membrane lipids in wheat leaf sheaths during incompatible interactions with Hessian fly.  

PubMed

Hessian fly (HF) is a biotrophic insect that interacts with wheat on a gene-for-gene basis. We profiled changes in membrane lipids in two isogenic wheat lines: a susceptible line and its backcrossed offspring containing the resistance gene H13. Our results revealed a 32 to 45% reduction in total concentrations of 129 lipid species in resistant plants during incompatible interactions within 24 h after HF attack. A smaller and delayed response was observed in susceptible plants during compatible interactions. Microarray and real-time polymerase chain reaction analyses of 168 lipid-metabolism-related transcripts revealed that the abundance of many of these transcripts increased rapidly in resistant plants after HF attack but did not change in susceptible plants. In association with the rapid mobilization of membrane lipids, the concentrations of some fatty acids and 12-oxo-phytodienoic acid (OPDA) increased specifically in resistant plants. Exogenous application of OPDA increased mortality of HF larvae significantly. Collectively, our data, along with previously published results, indicate that the lipids were mobilized through lipolysis, producing free fatty acids, which were likely further converted into oxylipins and other defense molecules. Our results suggest that rapid mobilization of membrane lipids constitutes an important step for wheat to defend against HF attack. PMID:22668001

Zhu, Lieceng; Liu, Xuming; Wang, Haiyan; Khajuria, Chitvan; Reese, John C; Whitworth, R Jeff; Welti, Ruth; Chen, Ming-Shun

2012-07-01

26

A pilot biomedical engineering course in rapid prototyping for mobile health.  

PubMed

Rapid prototyping of medically assistive mobile devices promises to fuel innovation and provides opportunity for hands-on engineering training in biomedical engineering curricula. This paper presents the design and outcomes of a course offered during a 16-week semester in Fall 2011 with 11 students enrolled. The syllabus covered a mobile health design process from end-to-end, including storyboarding, non-functional prototypes, integrated circuit programming, 3D modeling, 3D printing, cloud computing database programming, and developing patient engagement through animated videos describing the benefits of a new device. Most technologies presented in this class are open source and thus provide unlimited "hackability". They are also cost-effective and easily transferrable to other departments. PMID:24110238

Stokes, Todd H; Venugopalan, Janani; Hubbard, Elena N; Wang, May D

2013-01-01

27

An offline mobile nutrition monitoring intervention for varying-literacy patients receiving hemodialysis: a pilot study examining usage and usability  

PubMed Central

Objective Design and evaluation of the dietary intake monitoring application (DIMA) to assist varying-literacy patients receiving hemodialysis to adhere to their prescribed dietary regimen. Methods An iterative, user-centered design process informed by Bandura's social cognitive theory was employed to design DIMA—a mobile application that utilizes touch-screen, visual interfaces; barcode scanning; and voice recording to assist varying-literacy patients receiving hemodialysis to self-monitor their diet. A pilot field study was conducted where 18 patients receiving hemodialysis were recruited face-to-face from two dialysis facilities to use DIMA for 6?weeks. Subjects recorded their dietary intake using DIMA and met with research assistants three times each week. All interactions with DIMA were logged. Subjects' interdialytic weight gain was recorded throughout the study. At the end of the study, two face-to-face questionnaires were administered to assess usability and context of use. Results Subjects were able to use DIMA successfully—12 subjects used DIMA as much or more at the end of the study as they did at the beginning and reported that DIMA helped them change their diet. Subjects had difficulty using the barcode scanner. Viewing past meals was the most used of the reflection mechanisms in DIMA. Conclusion Results suggest that while many design features were useful, some could be improved. In particular, future versions of DIMA will be on a smartphone using a camera for barcode scanning, integrate feedback and past meal reflection into the normal flow of the application, and support visual cues when selecting food items.

Siek, Katie A; Chaudry, Beenish; Jones, Josette; Astroth, Kim; Welch, Janet L

2012-01-01

28

Ion mobility spectrometry for the rapid analysis of over-the-counter drugs and beverages  

PubMed Central

In the pharmaceutical industry, there are increasing requirements for analytical methods in quality assessment for the production of drugs. In this investigation, ion mobility spectrometry (IMS) was used for the rapid qualitative separation and identification of active ingredients in generic over-the-counter drugs and food additives in beverages. The active ingredients determined in drugs were acetaminophen, aspartame, bisacodyl, caffeine, dextromethorphan, diphenhydramine, famotidine, glucosamine, guaifenesin, loratadine, niacin, phenylephrine, pyridoxine, thiamin, and tetrahydrozoline. Aspartame and caffeine were determined in beverages. Fourteen over-the-counter drugs and beverages were analyzed. Analysis times below 10 s were obtained for IMS, and reduced mobilities were reported for the first time for 12 compounds. A quadrupole mass spectrometer coupled to a mobility spectrometer was used to assure a correct peak assignation. The combination of fast analysis, low cost, and inexpensive maintenance of IMS instruments makes IMS an attractive technique for the qualitative determination of the active ingredients in over-the-counter drugs and food additives in manufacture quality control and cleaning verification for the drug and food industries.

Fernandez-Maestre, Roberto

2009-01-01

29

A rapid analytical method for hair analysis using ambient pressure ion mobility mass spectrometry with electrospray ionization (ESI-IMMS)  

Microsoft Academic Search

Analysis of hair is often applied to assess drug abuse history, exposure to environmental and industrial pollutants, heavy\\u000a metals, gestational drug exposure and various other screening purposes. This manuscript reports the application of ambient\\u000a pressure ion mobility spectrometry mass spectrometry (IMMS) with electrospray ionization (ESI) source as a rapid analytical\\u000a tool for hair analysis. The study demonstrated that ion mobility

Prabha Dwivedi; Herbert H. Hill Jr

2008-01-01

30

Acute Sterol O-Acyltransferase 2 (SOAT2) Knockdown Rapidly Mobilizes Hepatic Cholesterol for Fecal Excretion.  

PubMed

The primary risk factor for atherosclerotic cardiovascular disease is LDL cholesterol, which can be reduced by increasing cholesterol excretion from the body. Fecal cholesterol excretion can be driven by a hepatobiliary as well as a non-biliary pathway known as transintestinal cholesterol efflux (TICE). We previously showed that chronic knockdown of the hepatic cholesterol esterifying enzyme sterol O-acyltransferase 2 (SOAT2) increased fecal cholesterol loss via TICE. To elucidate the initial events that stimulate TICE, C57Bl/6 mice were fed a high cholesterol diet to induce hepatic cholesterol accumulation and were then treated for 1 or 2 weeks with an antisense oligonucleotide targeting SOAT2. Within 2 weeks of hepatic SOAT2 knockdown (SOAT2HKD), the concentration of cholesteryl ester in the liver was reduced by 70% without a reciprocal increase in hepatic free cholesterol. The rapid mobilization of hepatic cholesterol stores resulted in a ?2-fold increase in fecal neutral sterol loss but no change in biliary cholesterol concentration. Acute SOAT2HKD increased plasma cholesterol carried primarily in lipoproteins enriched in apoB and apoE. Collectively, our data suggest that acutely reducing SOAT2 causes hepatic cholesterol to be swiftly mobilized and packaged onto nascent lipoproteins that feed cholesterol into the TICE pathway for fecal excretion. PMID:24901470

Marshall, Stephanie M; Gromovsky, Anthony D; Kelley, Kathryn L; Davis, Matthew A; Wilson, Martha D; Lee, Richard G; Crooke, Rosanne M; Graham, Mark J; Rudel, Lawrence L; Brown, J Mark; Temel, Ryan E

2014-01-01

31

Acute Sterol O-Acyltransferase 2 (SOAT2) Knockdown Rapidly Mobilizes Hepatic Cholesterol for Fecal Excretion  

PubMed Central

The primary risk factor for atherosclerotic cardiovascular disease is LDL cholesterol, which can be reduced by increasing cholesterol excretion from the body. Fecal cholesterol excretion can be driven by a hepatobiliary as well as a non-biliary pathway known as transintestinal cholesterol efflux (TICE). We previously showed that chronic knockdown of the hepatic cholesterol esterifying enzyme sterol O-acyltransferase 2 (SOAT2) increased fecal cholesterol loss via TICE. To elucidate the initial events that stimulate TICE, C57Bl/6 mice were fed a high cholesterol diet to induce hepatic cholesterol accumulation and were then treated for 1 or 2 weeks with an antisense oligonucleotide targeting SOAT2. Within 2 weeks of hepatic SOAT2 knockdown (SOAT2HKD), the concentration of cholesteryl ester in the liver was reduced by 70% without a reciprocal increase in hepatic free cholesterol. The rapid mobilization of hepatic cholesterol stores resulted in a ?2-fold increase in fecal neutral sterol loss but no change in biliary cholesterol concentration. Acute SOAT2HKD increased plasma cholesterol carried primarily in lipoproteins enriched in apoB and apoE. Collectively, our data suggest that acutely reducing SOAT2 causes hepatic cholesterol to be swiftly mobilized and packaged onto nascent lipoproteins that feed cholesterol into the TICE pathway for fecal excretion.

Marshall, Stephanie M.; Gromovsky, Anthony D.; Kelley, Kathryn L.; Davis, Matthew A.; Wilson, Martha D.; Lee, Richard G.; Crooke, Rosanne M.; Graham, Mark J.; Rudel, Lawrence L.

2014-01-01

32

Mycobacteria mobility shift assay: a method for the rapid identification of Mycobacterium tuberculosis and nontuberculous mycobacteria.  

PubMed

The identification of mycobacteria is essential because tuberculosis (TB) and mycobacteriosis are clinically indistinguishable and require different therapeutic regimens. The traditional phenotypic method is time consuming and may last up to 60 days. Indeed, rapid, affordable, specific and easy-to-perform identification methods are needed. We have previously described a polymerase chain reaction-based method called a mycobacteria mobility shift assay (MMSA) that was designed for Mycobacterium tuberculosis complex (MTC) and nontuberculous mycobacteria (NTM) species identification. The aim of this study was to assess the MMSA for the identification of MTC and NTM clinical isolates and to compare its performance with that of the PRA-hsp65 method. A total of 204 clinical isolates (102 NTM and 102 MTC) were identified by the MMSA and PRA-hsp65. For isolates for which these methods gave discordant results, definitive species identification was obtained by sequencing fragments of the 16S rRNA and hsp65 genes. Both methods correctly identified all MTC isolates. Among the NTM isolates, the MMSA alone assigned 94 (92.2%) to a complex or species, whereas the PRA-hsp65 method assigned 100% to a species. A 91.5% agreement was observed for the 94 NTM isolates identified by both methods. The MMSA provided correct identification for 96.8% of the NTM isolates compared with 94.7% for PRA-hsp65. The MMSA is a suitable auxiliary method for routine use for the rapid identification of mycobacteria. PMID:24821059

Wildner, Letícia Muraro; Bazzo, Maria Luiza; Liedke, Susie Coutinho; Nogueira, Christiane Lourenço; Segat, Gabriela; Senna, Simone Gonçalves; Schlindwein, Aline Daiane; Oliveira, Jaquelline Germano de; Rovaris, Darcita B; Bonjardim, Claudio A; Kroon, Erna G; Ferreira, Paulo Cp

2014-06-01

33

RAPID  

Cancer.gov

Rapid Access to Preventive Intervention Development (RAPID) Program About RAPID Description and Objectives of the Program Oversight RAPID Is Not... Frequently Asked Questions Application Information Format of Applications Address for Applications

34

Understanding Gas Phase Modifier Interactions in Rapid Analysis by Differential Mobility-Tandem Mass Spectrometry  

NASA Astrophysics Data System (ADS)

A systematic study involving the use and optimization of gas-phase modifiers in quantitative differential mobility-mass spectrometry (DMS-MS) analysis is presented using nucleoside-adduct biomarkers of DNA damage as an important reference point for analysis in complex matrices. Commonly used polar protic and polar aprotic modifiers have been screened for use against two deoxyguanosine adducts of DNA: N-(deoxyguanosin-8-yl)-4-aminobiphenyl (dG-C8-4-ABP) and N-(deoxyguanosin-8-y1)-2-amino-l-methyl-6-phenylimidazo[4,5-b]pyridine (dG-C8-PhIP). Particular attention was paid to compensation voltage (CoV) shifts, peak shapes, and product ion signal intensities while optimizing the DMS-MS conditions. The optimized parameters were then applied to rapid quantitation of the DNA adducts in calf thymus DNA. After a protein precipitation step, adduct levels corresponding to less than one modification in 106 normal DNA bases were detected using the DMS-MS platform. Based on DMS fundamentals and ab initio thermochemical results, we interpret the complexity of DMS modifier responses in terms of thermal activation and the development of solvent shells. At very high bulk gas temperature, modifier dipole moment may be the most important factor in cluster formation and cluster geometry, but at lower temperatures, multi-neutral clusters are important and less predictable. This work provides a useful protocol for targeted DNA adduct quantitation and a basis for future work on DMS modifier effects.

Kafle, Amol; Coy, Stephen L.; Wong, Bryan M.; Fornace, Albert J.; Glick, James J.; Vouros, Paul

2014-01-01

35

Understanding gas phase modifier interactions in rapid analysis by differential mobility-tandem mass spectrometry.  

PubMed

A systematic study involving the use and optimization of gas-phase modifiers in quantitative differential mobility-mass spectrometry (DMS-MS) analysis is presented using nucleoside-adduct biomarkers of DNA damage as an important reference point for analysis in complex matrices. Commonly used polar protic and polar aprotic modifiers have been screened for use against two deoxyguanosine adducts of DNA: N-(deoxyguanosin-8-yl)-4-aminobiphenyl (dG-C8-4-ABP) and N-(deoxyguanosin-8-y1)-2-amino-l-methyl-6-phenylimidazo[4,5-b]pyridine (dG-C8-PhIP). Particular attention was paid to compensation voltage (CoV) shifts, peak shapes, and product ion signal intensities while optimizing the DMS-MS conditions. The optimized parameters were then applied to rapid quantitation of the DNA adducts in calf thymus DNA. After a protein precipitation step, adduct levels corresponding to less than one modification in 10(6) normal DNA bases were detected using the DMS-MS platform. Based on DMS fundamentals and ab initio thermochemical results, we interpret the complexity of DMS modifier responses in terms of thermal activation and the development of solvent shells. At very high bulk gas temperature, modifier dipole moment may be the most important factor in cluster formation and cluster geometry, but at lower temperatures, multi-neutral clusters are important and less predictable. This work provides a useful protocol for targeted DNA adduct quantitation and a basis for future work on DMS modifier effects. PMID:24452298

Kafle, Amol; Coy, Stephen L; Wong, Bryan M; Fornace, Albert J; Glick, James J; Vouros, Paul

2014-07-01

36

Rapid analysis of lubricants by atmospheric solid analysis probe-ion mobility mass spectrometry.  

PubMed

Formulated lubricants are complex mixtures composed of base oil(s) and additives with various functions (detergents, corrosion inhibiter, antioxidant, viscosity modifiers, etc.). Because of the aliphatic nature of base oil and the chemical diversity of additives, the characterization of lubricant is currently a long and complex process. The comprehensive analysis of lubricant samples involves several techniques such as nuclear magnetic resonance, mass spectrometry, chromatography and infrared spectroscopy. The coupling of atmospheric solid analysis probe (ASAP) with ion mobility-mass spectrometry (IM-MS) has been shown to be an efficient tool for the characterization of complex mixture containing vaporizable polar to non-polar compounds. This approach affords the coupling of a direct ionization technique that does not require sample preparation, with a bi-dimensional separation method with high peak capacity. In this work, we show that ASAP-IM-MS is a suitable method for rapid and direct characterization of lubricant samples. Indeed, base oil and additives yielded, by ASAP, ions series which could be separated by IM-MS. Molecular additives such as Zn-dithiocarbamate, phosphite, thiophosphate and Alkyl diphenylamine were ionized as molecular ions [M](+•) or protonated molecules [M?+?H](+) , depending of their polarity. In some cases, fragment ions were observed, confirming the additive identification. In addition, high molecular weight polymeric additives such as poly(alkyl methacrylate) (PAM) were pyrolized in the ASAP source leading to characteristic fragment ions. ASAP-IM-MS is shown to be a powerful tool for studying complex mixtures, allowing the first comprehensive analysis of lubricants in just a few minutes. Copyright © 2014 John Wiley & Sons, Ltd. PMID:25044898

Barrère, Caroline; Hubert-Roux, Marie; Afonso, Carlos; Racaud, Amandine

2014-08-01

37

Rapid field installation, easy shipping with containerized mobile pipe coating plant  

Microsoft Academic Search

A one-of-a-kind mobile pipe coating plant designed to apply four of today's most sophisticated pipe coating materials has been developed by the Ramco Carlson organization in Tulsa, Okla., and Aberdeen Scotland. The mobile plant is designed to apply, through the interchange of specialized containers, any of these coatings: fusion-boded epoxy or heat-shrinkable tape. Every aspect of the plant was designed

Hale

1985-01-01

38

Development of rapid methodologies for the isolation and quantitation of drug metabolites by differential mobility spectrometry - mass spectrometry  

PubMed Central

Clinical and forensic toxicology laboratories are inundated with thousands of samples requiring lengthy chromatographic separations prior to mass spectrometry. Here, we employ differential mobility spectrometry (DMS) interfaced to nano-electrospray ionization-mass spectrometry to provide a rapid ion filtration technique for the separation of ions in gas phase media prior to mass spectral analysis on a DMS-integrated AB SCIEX API 3000 triple-quadrupole mass spectrometer. DMS is efficient at the rapid separation of ions under ambient conditions and provides many advantages when used as an ion filtration technique in tandem with mass spectrometry (MS) and MS/MS. Our studies evaluated DMS-MS/MS as a rapid, quantitative platform for the analysis of drug metabolites isolated from urine samples. In targeted applications, five metabolites of common drugs of abuse were effectively and rapidly separated using isopropanol and ethyl acetate as transport gas modifiers, eliminating the gas chromatography or liquid chromatography-based separations commonly employed in clinical and forensic toxicology laboratories. Calibration curves were prepared for the selected drug metabolites utilizing deuterated internal standards for quantitative purposes. The feasibility of separating and quantitating drug metabolites in a rapid fashion was evaluated by compensation voltage stepping followed by multiple reaction monitoring (MRM) detection. Rapid profiling of clinical and forensic toxicology samples could help to address an urgent need within the scientific community by developing high-throughput analytical methodologies, which could reduce significant case backlogs present within these laboratories.

Coy, Stephen L.; Nazarov, Erkinjon; Vouros, Paul

2013-01-01

39

Rapid Solution Hardening, Dislocation Mobility, and the Flow Stress of Crystals  

Microsoft Academic Search

A theory is derived for impurity-controlled dislocation mobility and the resultant temperature variation of the flow stress of lithium fluoride. The theory is suitable to crystals in which the hardening is primarily due to tetragonal lattice distortions such as result from the introduction of magnesium into lithium fluoride, these being defects whose interactions with dislocations have been calculated previously. Dislocation

Robert L. Fleischer

1962-01-01

40

Neural-adaptive control of single-master-multiple-slaves teleoperation for coordinated multiple mobile manipulators with time-varying communication delays and input uncertainties.  

PubMed

In this paper, adaptive neural network control is investigated for single-master-multiple-slaves teleoperation in consideration of time delays and input dead-zone uncertainties for multiple mobile manipulators carrying a common object in a cooperative manner. Firstly, concise dynamics of teleoperation systems consisting of a single master robot, multiple coordinated slave robots, and the object are developed in the task space. To handle asymmetric time-varying delays in communication channels and unknown asymmetric input dead zones, the nonlinear dynamics of the teleoperation system are transformed into two subsystems through feedback linearization: local master or slave dynamics including the unknown input dead zones and delayed dynamics for the purpose of synchronization. Then, a model reference neural network control strategy based on linear matrix inequalities (LMI) and adaptive techniques is proposed. The developed control approach ensures that the defined tracking errors converge to zero whereas the coordination internal force errors remain bounded and can be made arbitrarily small. Throughout this paper, stability analysis is performed via explicit Lyapunov techniques under specific LMI conditions. The proposed adaptive neural network control scheme is robust against motion disturbances, parametric uncertainties, time-varying delays, and input dead zones, which is validated by simulation studies. PMID:24808577

Li, Zhijun; Su, Chun-Yi

2013-09-01

41

Rapid Isothermal Gas Chromatography-Mass Spectrometry Method for Validating a Small Ion Mobility Spectrometer Sensor  

Microsoft Academic Search

A fast and reproducible isothermal gas chromatographic-mass spectrometric method for validating a small ion mobility spectrometer (IMS) sensor for detection of gaseous volatile organic compounds (VOCs) is presented. This method utilizes an automated cyclic valving (CV) sampling technique coupled to a gas chromatograph- mass spectrometer (GC\\/MS) in selected ion monitoring (SIM) mode (CV\\/GC\\/MS\\/ SIM). The sampling time is considerably reduced

Jerome A. Imonigie; Robert N. Walters; Molly M. Gribb

2006-01-01

42

Results from the Quake-Catcher Network Rapid Aftershock Mobilization Project (QCN-RAMP) in Christchurch, New Zealand and Advances in QCN Rapid Earthquake Detections  

NASA Astrophysics Data System (ADS)

Following the 4 September 2010 M7.1 Darfield earthquake in New Zealand, we initiated a QCN Rapid Aftershock Mobilization Project (RAMP). We rapidly installed 180 low-cost 14-bit USB Micro-Electro-Mechanical Systems (MEMS) accelerometers in less than a week in order to record aftershocks as many aftershocks as possible. Using data recorded by these stations, we began performing real-time tests of a rapid earthquake detection and characterization program that had been developed through retrospective testing of data collected during the M8.8 Maule, Chile RAMP deployment in early 2010 (Chung et al., 2011). QCN sensors recorded the M6.3 Christchurch event on 22 February 2011, and we used trigger information (station location, trigger time, and peak accelerations) to estimate the magnitude and location. In addition, we automatically produced a map of measured and predicted shaking intensities within 7 seconds of the earthquake origin time. Successive iterations improved the event characterization and, within 24 seconds of the earthquake, magnitude and location estimates were comparable to those provided by GNS. Using the wealth of data from this event as well as the following aftershocks, we continue to improve the detection and identification algorithms. Recent improvements include inverting data from all recorded events along with the GNS data from the same events to find an empirical relationship between peak ground motion at the time of the detection, station to event distance, and final magnitude. Whilst still in development, our preliminary results using the data collected from these and other QCN stations around the world suggest that MEMS sensors installed in homes, schools, and offices provide a way to dramatically increase the density of strong motion observations for use in seismic hazard analysis and earthquake early warning.

Chung, A. I.; Cochran, E. S.; Christensen, C.; Kaiser, A. E.; Lawrence, J. F.

2012-04-01

43

A Mobile Acoustic Subsurface Sensing (MASS) System for Rapid Roadway Assessment  

PubMed Central

Surface waves are commonly used for vibration-based nondestructive testing for infrastructure. Spectral Analysis of Surface Waves (SASW) has been used to detect subsurface properties for geologic inspections. Recently, efforts were made to scale down these subsurface detection approaches to see how they perform on small-scale structures such as concrete slabs and pavements. Additional efforts have been made to replace the traditional surface-mounted transducers with non-contact acoustic transducers. Though some success has been achieved, most of these new approaches are inefficient because they require point-to-point measurements or off-line signal analysis. This article introduces a Mobile Acoustic Subsurface Sensing system as MASS, which is an improved surface wave based implementation for measuring the subsurface profile of roadways. The compact MASS system is a 3-wheeled cart outfitted with an electromagnetic impact source, distance register, non-contact acoustic sensors and data acquisition/processing equipment. The key advantage of the MASS system is the capability to collect measurements continuously at walking speed in an automatic way. The fast scan and real-time analysis advantages are based upon the non-contact acoustic sensing and fast air-coupled surface wave analysis program. This integration of hardware and software makes the MASS system an efficient mobile prototype for the field test.

Lu, Yifeng; Zhang, Yi; Cao, Yinghong; McDaniel, J. Gregory; Wang, Ming L.

2013-01-01

44

Isoelectric point mobility shift assay for rapid screening of charged and uncharged ligands bound to proteins.  

PubMed

Three human proteins (hTAP1, hTAP2 and hTAP3) that are related to the yeast phosphatidylinositol/phosphatidylcholine transfer protein SEC14p were recently cloned in our laboratory. These proteins contain a relatively large hydrophobic pocket, the so called CRAL-TRIO domain, which is present also in other human proteins, such as CRALBP, alpha-TTP and MEG2. The CRAL-TRIO domains in these proteins bind ligands such as retinaldehyde, tocopherols and polyphosphoinositides, respectively. To screen for potential hTAPs ligands, we developed a semi-quantitative isoelectric point mobility shift assay (IPMS-assay) that allows assessing the binding of potential hydrophobic ligands to proteins. Purified proteins occupied with a charged ligand migrate differently on isoelectric focusing gels when compared with free protein. Competition of bound charged ligands with uncharged ones reverses the mobility shift, so that the relative affinities of the two ligands to the protein can be estimated. PMID:12749692

Kempná, Petra; Cipollone, Rita; Villacorta, Luis; Ricciarelli, Roberta; Zingg, Jean-Marc

2003-02-01

45

Rapid Analysis of Isobaric Exogenous Metabolites by Differential Mobility Spectrometry Mass Spectrometry  

SciTech Connect

The direct separation of isobaric glucuronide metabolites from propranolol dosed tissue extracts by differential mobility spectrometry mass spectrometry (DMS-MS) with the use of a polar gas-phase chemical modifier was demonstrated. The DMS gas-phase separation was able to resolve the isobaric metabolites with separation times on the order of ms instead of mins to hrs typically required when using pre-ionization chromatographic separation methods. Direct separation of isobaric metabolites from the complex tissue extract was validated using standards as well as implementing an HPLC separation prior to the DMS-MS analysis to pre-separate the species of interest. The ability to separate isobaric exogenous metabolites directly from a complex tissue extract is expected to facilitate the drug development process by increasing analytical throughput without the requirement for pre-ionization cleanup or separation strategies.

Parson, Whitney B [ORNL; Schneider, Bradley B [MDS Sciex; Kertesz, Vilmos [ORNL; Corr, Jay [AB Sciex; Covey, Thomas R. [MDS Sciex; Van Berkel, Gary J [ORNL

2011-01-01

46

Rapid analysis of isomeric exogenous metabolites by differential mobility spectrometry-mass spectrometry.  

PubMed

The direct separation of isomeric glucuronide metabolites from propranolol dosed tissue extracts by differential mobility spectrometry-mass spectrometry (DMS-MS) with the use of the polar gas-phase chemical modifier acetonitrile was demonstrated. The DMS gas-phase separation was able to resolve the isomeric metabolites with separation times on the order of milliseconds instead of minutes which is typically required when using pre-ionization chromatographic separation methods. Direct separation of isomeric metabolites from the complex tissue extract was confirmed by implementing a high-performance liquid chromatography (HPLC) separation prior to the DMS-MS analysis to pre-separate the species of interest. The ability to separate isomeric exogenous metabolites directly from a complex tissue extract is expected to facilitate the drug development process by increasing analytical throughput without the requirement for pre-ionization cleanup or separation strategies. PMID:22002690

Parson, Whitney B; Schneider, Bradley B; Kertesz, Vilmos; Corr, Jay J; Covey, Thomas R; Van Berkel, Gary J

2011-11-30

47

Pocket pathologist: A mobile application for rapid diagnostic surgical pathology consultation  

PubMed Central

Introduction: Telepathology allows the digital transmission of images for rapid access to pathology experts. Recent technologic advances in smartphones have allowed them to be used to acquire and transmit digital images of the glass slide, representing cost savings and efficiency gains over traditional forms of telepathology. We report our experience with developing an iPhone application (App - Pocket Pathologist) to facilitate rapid diagnostic pathology teleconsultation utilizing a smartphone. Materials and Methods: A secure, web-based portal (http://pathconsult.upmc.com/) was created to facilitate remote transmission of digital images for teleconsultation. The App augments functionality of the web-based portal and allows the user to quickly and easily upload digital images for teleconsultation. Image quality of smartphone cameras was evaluated by capturing images using different adapters that directly attach phones to a microscope ocular lens. Results: The App was launched in August 2013. The App facilitated easy submission of cases for teleconsultation by limiting the number of data entry fields for users and enabling uploading of images from their smartphone's gallery wirelessly. Smartphone cameras properly attached to a microscope create static digital images of similar quality to a commercial digital microscope camera. Conclusion: Smartphones have great potential to support telepathology because they are portable, provide ubiquitous internet connectivity, contain excellent digital cameras, and can be easily attached to a microscope. The Pocket Pathologist App represents a significant reduction in the cost of creating digital images and submitting them for teleconsultation. The iPhone App provides an easy solution for global users to submit digital pathology images to pathology experts for consultation.

Hartman, Douglas J.; Parwani, Anil V.; Cable, Bill; Cucoranu, Ioan C.; McHugh, Jeff S.; Kolowitz, Brian J.; Yousem, Samuel A.; Palat, Vijaykumar; Reden, Anna Von; Sloka, Stephen; Lauro, Gonzalo Romero; Ahmed, Ishtiaque; Pantanowitz, Liron

2014-01-01

48

Effect of Series Resistance on Field-Effect Mobility at Varying Channel Lengths and Investigation into the Enhancement of Source/Drain Metallized Thin-Film Transistor Characteristics  

NASA Astrophysics Data System (ADS)

The degradation in device performance due to parasitic resistance along the source and drain electrodes is a serious problem in thin-film transistor fabrication. The effect of this series resistance on the field-effect mobility has been discussed and solutions for the reduction of this unexpected resistance were studied in this work. From the derivation of the drain current, it was shown that the additional resistance had a greater influence on short-channel devices. The ratio of the series resistance to the channel resistance determined the amount of degradation to the field-effect mobility. A thin-film transistor using an aluminum-metallized source/drain was suggested; it showed an improvement in comparison with the conventional doped source/drain device, with a maximum mobility of 105 cm2 V-1 s-1. However, significant degradation of the mobility in the short-channel cases exposed the limitations of the structure. By employing doping for the source/drain metallized structure the maximum mobility reached a value of 150 cm2 V-1 s-1. The decrease in the mobility caused by the channel length decrease was also improved. This study clearly explained the problem of additional resistance on the field-effect mobility of thin-film transistors and the achievements of a device using a self-aligned fabrication process with metallized electrodes.

Duy, Nguyen Van; Baek, Kyunghyun; Son, Dang Ngoc; Lee, Wonbaek; Kim, Kwangryul; Choi, Byoungdeog; Chung, Hokyun; Yi, Junsin

2011-02-01

49

Rapid mobility of motile varicosities and inclusions containing alpha-spectrin, actin, and calmodulin in regenerating axons in vitro.  

PubMed

Time-lapse video recording was used to investigate the bidirectional movements of motile varicosities and intervening phase-dense (IPD) inclusions associated with axons of goldfish retinal ganglion cells regenerating in vitro. In addition, analyses of fine structure and immunocytochemical distributions of alpha-spectrin (fodrin), actin, and calmodulin in axonal fields were undertaken. Varicosities and IPD inclusions undergo saltations in a random manner at mean rates of 0.218 and 3.33 micron/sec, respectively. Experiments involving calcium antagonists or depletion of internal calcium stores resulted in an arrest of all intra-axonal movement, indicating that saltations of the two mobile structures are dependent on intra-axonal calcium. The predominant structure in varicosities is a large aggregation of an anastomosing, tubular, smooth endoplasmic reticulum embedded in an amorphous matrix, suggesting a form of "packaged" cytomembranes undergoing bulk transport. IPD inclusions, presumably carrying membranes, appear to shuttle between varicosities and growth cones during axon elongation, and between growth cones and varicosities during axon retraction. alpha-Spectrin, actin, and calmodulin were shown by immunocytochemistry to be preferentially distributed to varicosities and IPD inclusions. The co-transport of spectrin, actin, and calmodulin with cytomembranes undergoing rapid saltations departs from reported results of radioactive labeling experiments insofar as spectrin, actin, and calmodulin are not normally associated with rapidly transported membrane components in the latter studies. Possible reasons for the discrepancy are discussed. Our results suggest that spectrin and actin may play a role in the packaging and axoplasmic transport of cytomembranes concerned with plasmalemma recycling. PMID:3973692

Koenig, E; Kinsman, S; Repasky, E; Sultz, L

1985-03-01

50

Nucleoplasmic beta-actin exists in a dynamic equilibrium between low-mobility polymeric species and rapidly diffusing populations.  

PubMed

Beta-actin, once thought to be an exclusively cytoplasmic protein, is now known to have important functions within the nucleus. Nuclear beta-actin associates with and functions in chromatin remodeling complexes, ribonucleic acid polymerase complexes, and at least some ribonucleoproteins. Proteins involved in regulating actin polymerization are also found in the interphase nucleus. We define the dynamic properties of nuclear actin molecules using fluorescence recovery after photobleaching. Our results indicate that actin and actin-containing complexes are reduced in their mobility through the nucleoplasm diffusing at approximately 0.5 microm2 s(-1). We also observed that approximately 20% of the total nuclear actin pool has properties of polymeric actin that turns over rapidly. This pool could be detected in endogenous nuclear actin by using fluorescent polymeric actin binding proteins and was sensitive to drugs that alter actin polymerization. Our results validate previous reports of polymeric forms of nuclear actin observed in fixed specimens and reveal that these polymeric forms are very dynamic. PMID:16476775

McDonald, Darin; Carrero, Gustavo; Andrin, Christi; de Vries, Gerda; Hendzel, Michael J

2006-02-13

51

A rapid functional assay for the human trace amine-associated receptor 1 based on the mobilization of internal calcium.  

PubMed

The molecular targets for trace amines (TAs) such as p-tyramine and beta-phenylethylamine have been recently discovered and have been shown to comprise a family of G-protein-coupled receptors based on DNA sequence homologies. These have been termed trace amine-associated receptors (TAARs) because TAs do not activate all of the identified receptors. Because TA may be involved in modulating a variety of behaviors including mood, cognition, and addiction, it is of interest to discover novel ligands for TAARs to probe the role TAs play in brain function. Pharmacophore development for the G(s)-coupled human TAAR1 (hTAAR1) would be aided by a rapid functional assay amenable to screening libraries of compounds. Accordingly, the authors used RD-HGA16 CHO-1 cells from Molecular Devices, which stably express the promiscuous G(q), G(alpha16), to create a cell line stably expressing hTAAR1, thereby coupling receptor activation to the mobilization of internal calcium. They used this cell line to develop a homogenous fluorometric imaging plate reader-based assay using the Calcium 3 fluorescent dye. The EC50 and Emax data obtained for known TAs are in close agreement with previous work using transient hTAAR1 expression systems or a chimeric receptor. These data indicate that the hTAAR1 retains its reported pharmacological characteristics when coupled to G(alpha16). PMID:16831861

Navarro, Hernán A; Gilmour, Brian P; Lewin, Anita H

2006-09-01

52

Taking to bed. Rapid functional decline in an independently mobile older population living in an intermediate-care facility.  

PubMed

The objective of this study was to determine the incidence and selected clinical outcomes of taking to bed among a population of independently ambulating older individuals. It was designed as a retrospective case series and was conducted in the intermediate-care facility of a not-for-profit, teaching nursing home. Our study group was composed of individuals over 65 years of age who became bed bound. Thirty-six taking-to-bed episodes occurred in 36 individuals during one calendar year, giving an incidence of 13 per 1,000 resident-months (95% CI, 4 to 23 per 1,000). Twelve of the 36 died within 3 months, and 17 within 6 months, but almost all who survived regained ambulation. Survival was significantly shorter for the five without localizing symptoms (P less than .05). Orthopedic, neurologic, psychiatric, and iatrogenic conditions were most commonly identified as concurrent medical events. Almost half who took to bed had multiple concurrent medical events, and these residents were more likely to present without localizing symptoms (P less than .05). Twenty-one (58%) of the episodes occurred after a fall. The incidence of taking to bed in this population indicates that clinicians caring for older persons should be alert to its occurrence. The dramatic decline in mobility deserves careful assessment because it initiated a period of relatively rapid change in the health careers of the individuals we studied: almost half died within 6 months, but nearly all who survived regained ambulation. Those without localizing symptoms may have more complex interacting medical problems and a worse prognosis. PMID:2212449

Clark, L P; Dion, D M; Barker, W H

1990-09-01

53

Developing a Control Architecture for Multiple Unmanned Aerial Vehicles to Search and Localize RF Time-Varying Mobile Targets: Part I  

Microsoft Academic Search

In this paper, we present a control architecture that allows multiple Unmanned Aerial Vehicles (UAVs) to cooperatively detect mobile RF (Radio Frequency) emitting ground targets. The architecture is developed under the premise that UAVs are controlled as a distributed system. The distributed system-based technique maximizes the search and detection capabilities of multiple UAVs. We use a hybrid approach that combines

Daniel J. Pack; George W. P. York

2005-01-01

54

Kinect Technology Game Play to Mimic Quake Catcher Network (QCN) Sensor Deployment During a Rapid Aftershock Mobilization Program (RAMP)  

NASA Astrophysics Data System (ADS)

The Kinect technology allows for hands-free game play, greatly increasing the accessibility of gaming for those uncomfortable using controllers. How it works is the Kinect camera transmits invisible near-infrared light and measures its "time of flight" to reflect off an object, allowing it to distinguish objects within 1 centimeter in depth and 3 mm in height and width. The middleware can also respond to body gestures and voice commands. Here, we use the Kinect Windows SDK software to create a game that mimics how scientists deploy seismic instruments following a large earthquake. The educational goal of the game is to allow the players to explore 3D space as they learn about the Quake Catcher Network's (QCN) Rapid Aftershock Mobilization Program (RAMP). Many of the scenarios within the game are taken from factual RAMP experiences. To date, only the PC platform (or a Mac running PC emulator software) is available for use, but we hope to move to other platforms (e.g., Xbox 360, iPad, iPhone) as they become available. The game is written in programming language C# using Microsoft XNA and Visual Studio 2010, graphic shading is added using High Level Shader Language (HLSL), and rendering is produced using XNA's graphics libraries. Key elements of the game include selecting sensor locations, adequately installing the sensor, and monitoring the incoming data. During game play aftershocks can occur unexpectedly, as can other problems that require attention (e.g., power outages, equipment failure, and theft). The player accrues points for quickly deploying the first sensor (recording as many initial aftershocks as possible), correctly installing the sensors (orientation with respect to north, properly securing, and testing), distributing the sensors adequately in the region, and troubleshooting problems. One can also net points for efficient use of game play time. Setting up for game play in your local environment requires: (1) the Kinect hardware ( $145); (2) a computer with a Windows operating system (Mac users can use a Windows emulator); and (3) our free QCN game software (available from http://quakeinfo.ucsd.edu/ dkilb/WEB/QCN/Downloads.html).

Kilb, D. L.; Yang, A.; Rohrlick, D.; Cochran, E. S.; Lawrence, J.; Chung, A. I.; Neighbors, C.; Choo, Y.

2011-12-01

55

Rapid and long-term effects of water deficit on gas exchange and hydraulic conductance of silver birch trees grown under varying atmospheric humidity  

PubMed Central

Background Effects of water deficit on plant water status, gas exchange and hydraulic conductance were investigated in Betula pendula under artificially manipulated air humidity in Eastern Estonia. The study was aimed to broaden an understanding of the ability of trees to acclimate with the increasing atmospheric humidity predicted for northern Europe. Rapidly-induced water deficit was imposed by dehydrating cut branches in open-air conditions; long-term water deficit was generated by seasonal drought. Results The rapid water deficit quantified by leaf (?L) and branch water potentials (?B) had a significant (P?rapid water deficit with respect to two characteristics - leaf conductance to water vapour and leaf hydraulic conductance. Disproportionate changes in sensitivity of stomatal versus leaf hydraulic conductance to water deficit will impose greater risk of desiccation-induced hydraulic dysfunction on the plants, grown under high atmospheric humidity, in case of sudden weather fluctuations, and might represent a potential threat in hemiboreal forest ecosystems. There is no trade-off between plant hydraulic capacity and photosynthetic water-use efficiency on short time scale.

2014-01-01

56

Rapid transformations of plant water-soluble organic compounds in relation to cation mobilization in an acid Oxisol  

Microsoft Academic Search

The maintenance of plant residues on the surface of acid soils in no-tillage cropping systems reportedly increases the downward mobility of Ca and Al. This study investigated the effects of application of aqueous extracts of residues of radish (Raphanus sativus), blue lupine (Lupinus angustifolius), black oat (Avena strigosa), soybean (Glicine max), and wheat (Triticum aestivum), without incubation (initial extract) or

J. C. Franchini; F. J. Gonzalez-Vila; F. Cabrera; M. Miyazawa; M. A. Pavan

2001-01-01

57

Varying constants.  

PubMed

We review properties of theories for the variation of gravitation and fine structure 'constants'. We highlight some general features of the cosmological models that exist in these theories with reference to recent quasar data that are consistent with time variation in the fine structure constant since a redshift of 3.5. The behaviour of a simple class of varying-alpha cosmologies is outlined in the light of all the observational constraints. PMID:16147502

Barrow, John D

2005-09-15

58

A mobile systems perspective on vehicular networks  

Microsoft Academic Search

To date the vehicular networks community has primarily focused on designing vehicle-to-vehicle communication systems that can communicate reliably in environments with high mobility and rapidly varying vehicle density. As standards for vehicular communications are maturing, it is becoming increasingly important to understand how these communication systems can and should interact with other technologies in vehicular systems. Vehicles have become rich

Marco Gruteser

2012-01-01

59

High mobility of bicoid captured by fluorescence correlation spectroscopy: implication for the rapid establishment of its gradient.  

PubMed

The Bicoid (Bcd) morphogen is essential for pattern formation in fruit flies. It forms an exponential concentration gradient along the embryo AP axis and turns on cascades of target genes in distinct anterior domains. The most commonly accepted model for gradient formation assumes that Bcd travels by simple diffusion and is uniformly degraded across syncytial embryos, yet several recent studies have challenged these ideas. Here, the question of Bcd mobility was investigated using fluorescence correlation spectroscopy in live Drosophila melanogaster embryos. Bcd-EGFP molecules were found to be highly mobile in the cytoplasm during cycles 12-14, with a diffusion coefficient approximately 7 microm(2)/s. This value is large enough to explain the stable establishment of the Bcd gradient simply by diffusion before cycle 8, i.e., before the onset of zygotic transcription. PMID:20712981

Abu-Arish, Asmahan; Porcher, Aude; Czerwonka, Anna; Dostatni, Nathalie; Fradin, Cécile

2010-08-01

60

Development of an env gp41Based Heteroduplex Mobility Assay for Rapid Human Immunodeficiency Virus Type 1 Subtyping  

Microsoft Academic Search

The gp120 region of the human immunodeficiency virus type 1 (HIV-1) envelope (env) gene exhibits a high level of genetic heterogeneity across the group M subtypes. The heteroduplex mobility assay (HMA) has successfully been used to assign subtype classifications, but C2V5 primers often fail to amplify African strains. We developed an env gp41-based HMA for which the target sequence is

S. M. Agwale; K. E. Robbins; L. Odama; A. Saekhou; C. Zeh; A. Edubio; O. M. Njoku; N. Sani-Gwarzo; M. F. Gboun; F. Gao; M. Reitz; D. Hone; T. M. Folks; D. Pieniazek; C. Wambebe; M. L. Kalish

2001-01-01

61

Rapid desensitization of serotonin 5-HT2C receptor-stimulated intracellular calcium mobilization in CHO cells transfected with cloned human 5-HT2C receptors.  

PubMed

Serotonin 5-HT2C receptor-mediated intracellular Ca2+ mobilization was investigated in Chinese hamster ovary (CHO) cells transfected with 5-HT2C receptors. Fura-2 acetoxymethyl ester was used to investigate the regulation of 5-HT2C receptor function. CHO cells, transfected with a cDNA clone for the 5-HT2C receptor, expressed 287 fmol/mg of the receptor protein as determined by mianserin-sensitive [3H]mesulergine binding (KD = 0.49 nM). The addition of 5-HT mobilized intracellular Ca2+ in a dose-dependent fashion, ranging from a basal level of 99 +/- 1.8 up to 379 +/- 18 nM, with an EC50 value for 5-HT of 0.029 microM. Exposure to 5-HT, 1-(3-chlorophenyl)piperazine dihydrochloride (a 5-HT2C agonist), and 1-(4-iodo-2,5-dimethoxyphenyl)-2-aminopropane (a 5-HT2C and 5-HT2A agonist) resulted in increased intracellular Ca2+ levels. Mianserin, mesulergine, ritanserin, and ketanserin each blocked 5-HT-mediated intracellular Ca2+ mobilization more effectively than spiperone. The receptor was rapidly desensitized by preexposure to 5-HT in a time- and concentration-dependent manner. Mezerein and phorbol 12-myristate 13-acetate, protein kinase C activators, weakly inhibited the intracellular Ca2+ mobilization induced by 10 microM 5-HT. Furthermore, the protein kinase C inhibitor H-7 partially prevented the protein kinase C activator-induced inhibition of the 5-HT-mediated increase in intracellular Ca2+ concentration. The desensitization induced by pretreatment with 5-HT was blocked by W-7, added in conjunction with 5-HT, and partially inhibited by W-5, a nonselective inhibitor of protein kinases and weak analogue of W-7.(ABSTRACT TRUNCATED AT 250 WORDS) PMID:7760026

Akiyoshi, J; Nishizono, A; Yamada, K; Nagayama, H; Mifune, K; Fujii, I

1995-06-01

62

Long-Range Fading Prediction and Realistic Physical Modeling to Enable Adaptive Transmission for Mobile Radio Networks.  

National Technical Information Service (NTIS)

The feasibility of adaptive transmission enabled by Long Range Fading Prediction (LRP) was investigated for rapidly varying fading channels encountered in peer-to-peer mobile communication systems. The LRP algorithms were tested using the standard Jakes m...

A. Duel-Hallen H. Hallen

2005-01-01

63

Characterization of urban pollutant emission fluxes and ambient concentration distributions using a mobile laboratory with rapid response instrumentation.  

PubMed

A large and increasing fraction of the planet's population lives in megacities, especially in the developing world. These large metropolitan areas generally have very high levels of both gaseous and particulate air pollutants that have severe impacts on human health, ecosystem viability, and climate on local, regional, and even continental scales. Emissions fluxes and ambient pollutant concentration distributions are generally poorly characterized for large urban areas even in developed nations. Much less is known about pollutant sources and concentration patterns in the faster growing megacities of the developing world. New methods of locating and measuring pollutant emission sources and tracking subsequent atmospheric chemical transformations and distributions are required. Measurement modes utilizing an innovative van based mobile laboratory equipped with a suite of fast response instruments to characterize the complex and "nastier" chemistry of the urban boundary layer are described. Instrumentation and measurement strategies are illustrated with examples from the Mexico City and Boston metropolitan areas. It is shown that fleet average exhaust emission ratios of formaldehyde (HCHO), acetaldehyde (CH3CHO) and benzene (C6H6) are substantial in Mexico City, with gasoline powered vehicles emitting higher levels normalized by fuel consumption. NH3 exhaust emissions from newer light duty vehicles in Mexico City exceed levels from similar traffic in Boston. A mobile conditional sampling air sample collection mode designed to collect samples from intercepted emission plumes for later analysis is also described. PMID:16161792

Herndon, Scott C; Jayne, John T; Zahniser, Mark S; Worsnop, Douglas R; Knighton, Berk; Alwine, Eugene; Lamb, Brian K; Zavala, Miguel; Nelson, David D; McManus, J Barry; Shorter, Joanne H; Canagaratna, Manjula R; Onasch, Timothy B; Kolb, Charles E

2005-01-01

64

Automatic dilution gaging of rapidly varying flow  

USGS Publications Warehouse

Obtaining discharge ratings at urban gaging stations is often difficult. Results of using an automated constant-rate dye-dilution technique to measure discharge at two sites in Madison, Wisconsin, are presented. The sites selected have well-defined stage-discharge ratings, developed during previous hydrologic studies. One site is a 60-inch-diameter concrete storm sewer and the other a concrete-lined open trapezoidal channel. Equipment selected to automate the method included a portable automatic water sampler, four-channel event recorder; and for dye injection, a peristaltic pump. An electrical switching circuit was designed to coordinate the operation of the water sampler, injection pump, and four-channel recorder. During the data-collection period of 1 year, a total of 20 storms was monitored. The analyses showed that the discharges measured by dye-dilution techniques ranged from + or - 5 to + or - 10 percent of the discharges determined from ratings established by current-meter measurements. Larger differences were noted at the start of and on the rising limb of four hydrographs. Of the 20 storms monitored, 17 produced acceptable results. Peak discharges by the dilution method at the open-channel site ranged from 0 to 12 percent departures from the existing rating, whereas the peak discharge by the dilution method at the storm-sewer site ranged from 0 to 5 percent departures from the existing rating. (UGGS)

Duerk, M. D.

1983-01-01

65

Direct Infusion Electrospray Ionization - Ion Mobility - High Resolution Mass Spectrometry (DIESI-IM-HRMS) for Rapid Characterization of Potential Bioprocess Streams  

NASA Astrophysics Data System (ADS)

Direct infusion electrospray ionization - ion mobility - high resolution mass spectrometry (DIESI-IM-HRMS) has been utilized as a rapid technique for the characterization of total molecular composition in "whole-sample" biomass hydrolysates and extracts. IM-HRMS data reveal a broad molecular weight distribution of sample components (up to 1100 m/z) and provide trendline isolation of feedstock components from those introduced "in process." Chemical formulas were obtained from HRMS exact mass measurements (with typical mass error less than 5 ppm) and were consistent with structural carbohydrates and other lignocellulosic degradation products. Analyte assignments are supported via IM-MS collision-cross-section measurements and trendline analysis (e.g., all carbohydrate oligomers identified in a corn stover hydrolysate were found to fall within 6 % of an average trendline). These data represent the first report of collision cross sections for several negatively charged carbohydrates and other acidic species occurring natively in biomass hydrolysates.

Munisamy, Sharon M.; Chambliss, C. Kevin; Becker, Christopher

2012-07-01

66

High electron concentration and mobility in Al-doped n-ZnO epilayer achieved via dopant activation using rapid-thermal annealing  

SciTech Connect

We report on the growth of very high-quality Al-doped n-type ZnO epilayers on sapphire substrates using a radio-frequency (rf) magnetron sputtering technique combined with a rapid-thermal annealing. Photoluminescence (PL) and Hall measurements show that both the optical and electrical properties of the ZnO layers are significantly improved with an increasing annealing temperature up to 900 deg. C. For example, the samples that are grown at 600 deg. C and a rf power of 100 W with an Ar/O{sub 2} gas ratio of 1 give an electron concentration of 1.83x10{sup 20} cm{sup 3} and a mobility of 65.6 cm{sup 2}/V s, when annealed at 900 deg. C for 3 min in a nitrogen ambient. Furthermore, x-ray diffraction measurements show that both the as-grown and annealed samples are of excellent crystallinity.

Kim, Kyoung-Kook; Niki, Shigeru; Oh, Jin-Yong; Song, June-O; Seong, Tae-Yeon; Park, Seong-Ju; Fujita, Shizuo; Kim, Sang-Woo [Thin Film Compound Semiconductor Team, Research Center for Photovoltaics, National Institute of Advanced Industrial Science and Technology, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8586 (Japan); Department of Materials Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 500-712 (Korea, Republic of); International Innovation Center, Kyoto University, Yoshida-honmachi, Sakyo, Kyoto 606-8501 (Japan); Department of Electronic Science and Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8501 (Japan)

2005-03-15

67

Make a Mobile!  

NSDL National Science Digital Library

In this activity, learners make mobiles to explore the concepts of balance, counterbalance, weight, and counterweight. Learners are encouraged to work in groups or with their families to create balanced mobiles using a variety of materials of varying weights.

Museum, Chicago C.

2010-01-01

68

Rapid subsidence in the Nile delta and the effects of a mobile depositional surface on stratigraphic facies development  

SciTech Connect

Radiocarbon-dated late Quaternary sedimentary sections serve as a base to quantify high rates of subsidence in the northern Nile delta of Egypt. Measurements of recent vertical shifts of land relative to the sea, coupled with eustatic changes, are used to interpret temporal and spatial facies distribution patterns and delta lobe migration in the major recent depocenter in the eastern Mediterranean. The study is based largely on cores, collected during two drilling expeditions, which recovered material deposited during the past 30,000 years. These borings, plus an additional 50 core logs, allow good correlation for the region around Lake Manzala. There, variable thicknesses of Holocene marine and fluvio-marine units lie above transgressive coastal sands (upper Pleistocene to lower Holocene) and older alluvial delta-plain deposits. Mapping of these facies shows that the top of the transgressive sand becomes younger (to -- 7,000 years ago) and shallower toward the south of the present coastline. Progradation of delta lobes began about 8,000 years ago, and the coastline has advanced northward at a rate of approximately 1 km/100 years. Lake Manzala lies almost directly above, and is clearly related to, a 60-km long, narrow, linear northwest-southeast region of rapid subsidence; its axis trends parallel to, but is 10-15 km inland of, the present coastline. Holocene coastal and marine sediments lie at depths of 50 m, suggesting a lowering of land relative to the sea of about 40 cm per century. This linear zone, probably the surface expression of a growth fault, has been highly active during deposition. Similar neotectonic dislocation of sedimentary sections underlying the other lakes and lagoons in the northern delta is postulated. Facies patterns have been more extensively affected by rapid subsidence in the Nile delta than previously indicated.

Stanley, D.J.

1988-01-01

69

Time varying networks and the weakness of strong ties  

PubMed Central

In most social and information systems the activity of agents generates rapidly evolving time-varying networks. The temporal variation in networks' connectivity patterns and the ongoing dynamic processes are usually coupled in ways that still challenge our mathematical or computational modelling. Here we analyse a mobile call dataset and find a simple statistical law that characterize the temporal evolution of users' egocentric networks. We encode this observation in a reinforcement process defining a time-varying network model that exhibits the emergence of strong and weak ties. We study the effect of time-varying and heterogeneous interactions on the classic rumour spreading model in both synthetic, and real-world networks. We observe that strong ties severely inhibit information diffusion by confining the spreading process among agents with recurrent communication patterns. This provides the counterintuitive evidence that strong ties may have a negative role in the spreading of information across networks.

Karsai, Marton; Perra, Nicola; Vespignani, Alessandro

2014-01-01

70

Time varying networks and the weakness of strong ties.  

PubMed

In most social and information systems the activity of agents generates rapidly evolving time-varying networks. The temporal variation in networks' connectivity patterns and the ongoing dynamic processes are usually coupled in ways that still challenge our mathematical or computational modelling. Here we analyse a mobile call dataset and find a simple statistical law that characterize the temporal evolution of users' egocentric networks. We encode this observation in a reinforcement process defining a time-varying network model that exhibits the emergence of strong and weak ties. We study the effect of time-varying and heterogeneous interactions on the classic rumour spreading model in both synthetic, and real-world networks. We observe that strong ties severely inhibit information diffusion by confining the spreading process among agents with recurrent communication patterns. This provides the counterintuitive evidence that strong ties may have a negative role in the spreading of information across networks. PMID:24510159

Karsai, Márton; Perra, Nicola; Vespignani, Alessandro

2014-01-01

71

Rapid analysis of tile industry gaseous emissions by ion mobility spectrometry and comparison with solid phase micro-extraction/gas chromatography/mass spectrometry.  

PubMed

The present paper reports on a rapid method for the analysis of gaseous emissions from ceramic industry, based on ion mobility spectrometry (IMS) as a means for on-site monitoring of volatile organic compounds (VOCs) produced during tile baking. IMS was calibrated with a set of reference compounds (i.e. ethyl acetate, ethanol, ethylene glycol, diethylene glycol, acetaldehyde, formaldehyde, 2-methyl-1,3-dioxolane, 2,2-dimethyl-1,3-dioxolane, 1,3-dioxolane, 1,4-dioxane, benzene, toluene, cyclohexane, acetone, acetic acid) via air-flow permeation. The technique was tested on a laboratory-scale kiln and tiles prepared with selected glycol- and resin-based additives. Finally, the analytical method was applied to emissions from two industries in the Modena (Italy) ceramic area. The results of all experimental phases were compared to those obtained by solid phase micro-extraction/gas chromatography/mass spectrometry (SPME/GC/MS). IMS showed potential as a real-time monitoring device for quality assessment in ceramic industry emissions. IMS spectra, SPME/GC/MS data, relationship between additives/baking conditions and produced VOCs and advantages and limitations of both techniques will be discussed. PMID:17133278

Pozzi, R; Bocchini, P; Pinelli, F; Galletti, G C

2006-12-01

72

Performance Analysis of IP Mobility Protocols in Wireless Mobile Networks  

Microsoft Academic Search

\\u000a In this paper, we perform a comparative analysis of IP mobility protocols: Mobile IPv6 (MIPv6) and Hierarchical Mobile IPv6\\u000a (HMIPv6). Although both MIPv6 and HMIPv6 are efficient IP mobility protocols, the performance of IP mobility protocols may\\u000a vary widely depending on the various mobility and traffic related parameters. As a consequence, it is essential to perform\\u000a in-depth study and analysis

Ki-sik Kong; Ui-sung Song; Jin-su Kim; Chong-sun Hwang

2004-01-01

73

Basis expansion models and diversity techniques for blind identification and equalization of time-varying channels  

Microsoft Academic Search

The time-varying impulse response of rapidly fading mobile communication channels is expanded over a basis of complex exponentials that arise due to Doppler effects encountered with multipath propagation. Blind methods are reviewed for estimating the bases' parameters and the model orders. Existing second-order methods are critiqued and novel algorithms are developed for blind identification, direct, zero-forcing equalization and minimum mean

GEORGIOS B. GIANNAKIS; C. Tepedelenlioglu

1998-01-01

74

Effects of postgrowth rapid thermal annealing on InAlAs/InGaAs metamorphic high-electron-mobility transistor grown on a compositionally graded InAlAs/InGaAlAs buffer  

SciTech Connect

Effects of postgrowth rapid thermal annealing (RTA) on structural and electrical properties of an In{sub 0.52}Al{sub 0.48}As/In{sub 0.52}Ga{sub 0.48}As metamorphic high-electron-mobility transistor (MHEMT) structure grown on a GaAs substrate utilizing a compositionally graded InAlAs/InGaAlAs buffer layer were investigated. High-resolution triple-axis x-ray diffraction, photoluminescence, and van der Pauw-Hall measurements were used for the investigation. While the RTA improved the structural property of the MHEMT, it degraded the channel mobility of the MHEMT due to defect-assisted impurity redistribution.

Ihn, Soo-Ghang; Jo, Seong-June; Song, Jong-In [Department of Information and Communications, Gwangju Institute of Science and Technology (GIST), 1 Oryong-dong, Buk-gu, Gwangju 500-712 (Korea, Republic of)

2005-07-25

75

Mobile Goes Mainstream  

ERIC Educational Resources Information Center

Mobile learning--the use of mobile devices for educational purposes by students--is rapidly moving from an experimental initiative by a few innovative districts over the last five years to a broadly accepted concept in K12. The latest research and surveys, results of pilot programs, and analysis of trends in both public education and the broader…

Eisele-Dyrli, Kurt

2011-01-01

76

Time Varying Feature Data  

NASA Astrophysics Data System (ADS)

The infrastructure to gather, store and access information about our environment is improving and growing rapidly. The increasing amount of information allows us to get a better understanding of the current state of our environment, historical processes and to simulate and predict the future state of the environment. Finer grained spatial and temporal data and more reliable communications make it easier to model dynamic states and ephemeral features. The exchange of information within and across geospatial domains is facilitated through the use of harmonized information models. The Observations & Measurements (O&M) developed through OGC and standardised by ISO is an example of such a cross-domain information model. It is used in many domains, including meteorology, hydrology as well as the emergency management. O&M enables harmonized representation of common metadata that belong to the act of determining the state of a feature property, whether by sensors, simulations or humans. In addition to the resulting feature property value, information such as the result quality but especially the time that the result applies to the feature property can be represented. Temporal metadata is critical to modelling past and future states of a feature. The features, and the semantics of each property, are defined in domain specific Application Schema using the General Feature Model (GFM) from ISO 19109 and usually encoded following ISO 19136. However, at the moment these standards provide only limited support for the representation and handling of time varying feature data. Features like rivers, wildfires or gas plumes have a defined state - for example geographic extent - at any given point in time. To keep track of changes, a more complex model for example using time-series coverages is required. Furthermore, the representation and management of feature property value changes via the service interfaces defined by OGC and ISO - namely: WFS and WCS - would be rather complex. Keeping track of feature property value corrections or even feature (state change) cancellations for auditing purposes is also not easy to achieve. The aviation domain has strong requirements to represent and manage the state of aeronautical features through time. Being able to efficiently encode and manage feature state changes, keeping track of all changes for auditing purposes and being able to determine the future state of an aeronautical feature as currently known to the system are vital for aeronautical applications. In order to support these requirements, the Aeronautical Information Exchange Model (AIXM) which has been developed by the aviation domain is based on the so called AIXM Temporality Model (AIXM-TM). The AIXM-TM defines various rules for modeling, representing and handling the state of aeronautical features through time. This is a promising approach that can be incorporated into the GFM so that ultimately the modeling and management of time varying feature data is supported in an interoperable and harmonized way in all geospatial domains. This presentation gives an introduction to the main concepts of the AIXM-TM. It also shows how the GFM can be extended to support time varying feature data. Finally, the relationship of O&M and time varying features is discussed.

Echterhoff, J.; Simonis, I.; Atkinson, R.

2012-04-01

77

Mobile web applications: bringing mobile apps and web together  

Microsoft Academic Search

The popularity of mobile applications is very high and still growing rapidly. These applications allow their users to stay connected with a large number of service providers in seamless fashion, both for leisure and productivity. But service prThe popularity of mobile applications is very high and still growing rapidly. These applications allow their users to stay connected with a large

Marie-Claire Forgue; Dominique Hazaël-Massieux

2012-01-01

78

Thrombopoietin, flt3, and kit ligands together suppress apoptosis of human mobilized CD34 + cells and recruit primitive CD34 +Thy1 + cells into rapid division  

Microsoft Academic Search

Various combinations of cytokines have profoundly different effects on inhibition of apoptosis and stimulation of self-renewal division of hematopoietic stem cells (HSC) in short-term, ex vivo culture. Our goal was to quantitate expansion of cells with a primitive CD34+Thy-1+ phenotype, as well as cell cycling, division history, differentiation, and apoptosis of CD34+ cells enriched from normal donor mobilized peripheral blood

Lesley J Murray; Judy C Young; Linda J Osborne; Karin M Luens; Roland Scollay; Beth L Hill

1999-01-01

79

Mobile cloud computingas future for mobile applications — Implementatio methods and challenging issues  

Microsoft Academic Search

In recent years cloud computing has gained a momentum and is transforming the internet computing infrastructure. Also the mobile applications and mobile devices are developing rapidly. Cloud computing is anticipated to bring an innovation in mobile computing, where the mobile devices can use clouds for data processing, storage and other intensive operations. Already there are some mobile cloud applications for

Shahryar Shafique Qureshi; Toufeeq Ahmad; Khalid Rafique; Shuja-ul-islam

2011-01-01

80

Method for the simultaneous determination of vertical and horizontal mobilities in superlattices  

NASA Astrophysics Data System (ADS)

A magnetoresistance method is proposed which extracts both the growth direction mobility and the planar mobility of an anisotropic thin film, such as a superlattice. A magnetic field which varies in magnitude and orientation is employed. Errors appearing in previous magnetotransport studies on superlattices are resolved. In particular, it is shown that the contact layers used to send currents through an active region do not have a negligible resistance, even if they are much more conductive than the active region. The technique is demonstrated on an InAs/GaSb-based structure where the growth axis to planar mobility anisotropy ratio is found to drop rapidly with increasing temperature.

Swartz, C. H.; Myers, T. H.

2014-02-01

81

A Study on Service Quality Assurance in Mobile Commerce  

Microsoft Academic Search

With the advanced mobile technologies, mobile commerce has developed rapidly. However, mobile commerce users may not gain satisfactory services. It is necessary to study how to evaluate and assure the service quality in mobile commerce, so as to promote mobile commerce develop better. This paper put forward the service system of mobile commerce, and then summarizes the methodology of service

Lifang Peng; Lingling Lai

2009-01-01

82

Potential roles of military-specific response to natural disasters -- analysis of the rapid deployment of a mobile surgical team to the 2007 Peruvian earthquake.  

PubMed

The August 2007 earthquake in Peru resulted in the loss of critical health infrastructure and resource capacity. A regionally located United States Military Mobile Surgical Team was deployed and operational within 48 hours. However, a post-mission analysis confirmed a low yield from the military surgical resource. The experience of the team suggests that non-surgical medical, transportation, and logistical resources filled essential gaps in health assessment, evacuation, and essential primary care in an otherwise resource-poor surge response capability. Due to an absence of outcomes data, the true effect of the mission on population health remains unknown. Militaries should focus their disaster response efforts on employment of logistics, primary medical care, and transportation/evacuation. Future response strategies should be evidence-based and incorporate a means of quantifying outcomes. PMID:19557951

Malish, Richard; Oliver, David E; Rush, Robert M; Zarzabal, Esmeraldo; Sigmon, Michael J; Burkle, Frederick M

2009-01-01

83

Mole – Concepts of a mobile agent system  

Microsoft Academic Search

Due to its salient properties, mobile agent technology has received a rapidly growing attention over the last few years. Many developments of mobile agent systems are under way in both academic and industrial environments. In addition, there are already various efforts to standardize mobile agent facilities and architectures. Mole is the first mobile agent system that has been developed in

J. Baumann; F. Hohl; K. Rothermel; M. Straßer

1998-01-01

84

A mobile-based home automation system  

Microsoft Academic Search

The rapidly advancing mobile communication technology and the decrease in costs make it possible to incorporate mobile technology into home automation systems. We propose a mobile-based home automation system that consists of a mobile phone with Java capabilities, a cellular modem, and a home server. The home appliances are controlled by the home server, which operates according to the user

M. Van Der Werff; X. Gui; W. L. Xu

2005-01-01

85

Mobile Payments  

Microsoft Academic Search

The increasing deployment of wireless networks and the widespread popularity of handheld devices have led to numerous applications ranging from mobile banking to location-based tracking to mobile advertising. With nearly 300 million mobile users worldwide expected to be purchasing content on wireless devices by 2005, many of these emerging services would greatly benefit from infrastructure support for mobile payments. Many

Upkar Varshney

2002-01-01

86

A QoS-aware system for mobile cloud computing  

Microsoft Academic Search

With the rapid growth of mobile smart phone users, more and more mobile users are using mobile phones to access Internet services. Meanwhile, cloud computing is changing the landscape of Internet services, so as to affect the mobile services. Cloud computing is regarded as the future of mobile. However, cloud computing still faces a number of challenges, one of which

Peng Zhang; Zheng Yan

2011-01-01

87

Mobile Education through Camera-Equipped Mobile Phones  

Microsoft Academic Search

This paper proposes augmented learning contents (ALC) that can supply learners with dynamic interactions using multimedia information by recognizing real images of off-line contents using mobile devices. The techniques employed allow children to rapidly gain access to a large repository of multimedia information through the use of a camera- equipped mobile phone. Especially, there are many usages of external marks

EunJung Han; HwangKyu Yang; Keechul Jung

2007-01-01

88

Varying-{alpha} monopoles  

SciTech Connect

We study static magnetic monopoles in the context of varying-{alpha} theories and show that there is a group of models for which the 't Hooft-Polyakov solution is still valid. Nevertheless, in general static magnetic monopole solutions in varying-{alpha} theories depart from the classical 't Hooft-Polyakov solution with the electromagnetic energy concentrated inside the core seeding spatial variations of the fine-structure constant. We show that Equivalence Principle constraints impose tight limits on the allowed variations of {alpha} induced by magnetic monopoles which confirms the difficulty to generate significant spatial variation of the fine-structure constant found in previous works. This is true even in the most favorable case where magnetic monopoles are the source for these variations.

Menezes, J.; Avelino, P.P.; Santos, C. [Centro de Fisica do Porto e Departamento de Fisica da Faculdade de Ciencias da Universidade do Porto, Rua do Campo Alegre 687, 4169-007, Porto (Portugal)

2005-11-15

89

Weighted bicubic spline interpolation to rapidly varying data  

Microsoft Academic Search

The weighted bicubic spline that is a C1 piecewise bicubic interpolant to three-dimensional gridded data is introduced. This is a generalization of the univariate weighted spline, developed by Salkauskas, in that a weighted minimization problem is solved. The minimization problem solved is a weighted version of the problem that the natural bicubic spline and Gordon's spline-blended interpolants minimize. The surface

Thomas A. Foley

1987-01-01

90

Estimation of time-varying digital mobile radio channels  

Microsoft Academic Search

In packet-based communication systems using dispersive channels, training symbols are usually provided to estimate the channel response. It is demonstrated that for both simple constant and adaptive least-squares estimates, the average performance of the estimator can be computed with explicit reference to channel time variations. With these analytical results, quantitative evidence can be provided for the classification of channel time

R. A. Ziegler; J. M. Cioffi

1991-01-01

91

Efficient Estimation of Spatially Varying Subsurface Scattering Parameters for Relighting  

Microsoft Academic Search

We present an image-based technique to rapidly ac- quire spatially varying subsurface reflectance prop- erties of a human face. The estimated properties can be used directly to render faces with spatially vary- ing scattering, or can be used to estimate a robust average across the face. We demonstrate our tech- nique with renderings of peoples' faces under novel, spatially-varying illumination

Sarah Tariq; Andrew Gardner; Ignacio Llamas; Andrew Jones; Paul Debevec; Greg Turk

2006-01-01

92

Ultra(high)-pressure liquid chromatography-electrospray ionization-time-of-flight-ion mobility-high definition mass spectrometry for the rapid identification and structural characterization of flavonoid glycosides from cauliflower waste.  

PubMed

In this paper, a strategy for the detection and structural elucidation of flavonoid glycosides from a complex matrix in a single chromatographic run using U(H)PLC-ESI-IMS-HDMS/MS(E) is presented. This system operates using alternative low and high energy voltages that is able to perform the task of conventional MS/MS in a data-independent way without re-injection of the sample, which saves analytical time. Also, ion mobility separation (IMS) was employed as an additional separation technique for compounds that are co-eluting after U(H)PLC separation. First, the fragmentation of flavonoid standards were analyzed and criteria was set for structural elucidation of flavonoids in a plant extract. Based on retention times, UV spectra, exact mass, and MS fragment characteristics, such as abundances of daughter ions and the presence of radical ions ([Y0-H](-)), a total 19 flavonoid glycosides, of which 8 non-acylated and 11 acylated, were detected and structurally characterized in a cauliflower waste extract. Kaempferol and quercetin were the main aglycones detected while sinapic and ferulic acid were the main phenolic acids. C-glycosides were also found although their structure could not be elucidated. The proposed method can be used as a rapid screening test for flavonoid identification and for routine analysis of plant extracts, such as these derived from cauliflower waste. The study also confirms that agroindustrial wastes, such as cauliflower leaves, could be seen as a valuable source of different bioactive phenolic compounds. PMID:24280615

Gonzales, Gerard Bryan; Raes, Katleen; Coelus, Sofie; Struijs, Karin; Smagghe, Guy; Van Camp, John

2014-01-01

93

Displays enabling mobile multimedia  

NASA Astrophysics Data System (ADS)

With the rapid advances in telecommunications networks, mobile multimedia delivery to handsets is now a reality. While a truly immersive multimedia experience is still far ahead in the mobile world, significant advances have been made in the constituent audio-visual technologies to make this become possible. One of the critical components in multimedia delivery is the mobile handset display. While such alternatives as headset-style near-to-eye displays, autostereoscopic displays, mini-projectors, and roll-out flexible displays can deliver either a larger virtual screen size than the pocketable dimensions of the mobile device can offer, or an added degree of immersion by adding the illusion of the third dimension in the viewing experience, there are still challenges in the full deployment of such displays in real-life mobile communication terminals. Meanwhile, direct-view display technologies have developed steadily, and can provide a development platform for an even better viewing experience for multimedia in the near future. The paper presents an overview of the mobile display technology space with an emphasis on the advances and potential in developing direct-view displays further to meet the goal of enabling multimedia in the mobile domain.

Kimmel, Jyrki

2007-02-01

94

Usability guidelines for designing mobile learning portals  

Microsoft Academic Search

Mobile learning presumes the use of mobile Internet technology to facilitate the learning process. The growth and rapid evolution of the wireless technology have created new opportunities for anytime and anywhere learning paradigm. As a result, numerous mobile learning portals have been developed to gain the advantages of it. Nonetheless, there is little research and exploration has been initiated in

Daniel Su Kuen Seong

2006-01-01

95

Towards Secure Mobile Payment Based on SIP  

Microsoft Academic Search

Mobile payment has some unique advantages over more traditional payment methods in, for example, TV shopping and mobile multimedia services. Unfortunately, most existing mobile payment solutions rely heavily on underlying communication infrastructures, which are platform-dependent and have no unified implementation criteria. This limitation is reducing, however, through the rapid spread of the Voice over IP (VoIP) telephony service and its

Ge Zhang; Feng Cheng; Christoph Meinel

2008-01-01

96

Web Content Delivery to Heterogeneous Mobile Platforms  

Microsoft Academic Search

It is widely acknowledged that information such as web content should be adapted for mobile platforms to account for restrictions in mobile environments. As emerging mobile platforms such as different kinds of Personal Digital Assistant (PDA) tend to vary largely in their capabilities, we suggest that adaptation should be platform-specific. Common approaches for content adaptation are automated conversion and explicit

Martin Gaedke; Michael Beigl; Hans-werner Gellersen; Christian Segor

1998-01-01

97

RAPID Contacts  

Cancer.gov

Rapid Access to Preventive Intervention Development (RAPID) Program Contacts Program Contact RAPID ProgramAttn: Izet M. Kapetanovic, PhD, Program Director Chemopreventive Agent Development Research Group Division of Cancer Prevention, NCI Executive Plaza

98

Blade pitch varying mechanism  

SciTech Connect

A gas turbine engine is described comprising: (a) a stationary member; (b) first and second rotating structures coaxially disposed about the stationary member; (c) an annular gas flowpath coaxial with the first and second rotating structures; (d) first and second rotor blades attached to the first and second rotating structures; (e) forward and aft rows of variable pitch propulsor blades coupled to and disposed radially outwardly of the first and second rotating structures respectively; (f) a first gear coaxially coupled to one of the propulsor blades whereby angular displacement of the first gear about a radius of the rotating structure varies the pitch of the propulsor blade with respect to the rotating structure; (g) a second gear rotatably coupled to the first gear; (h) a third gear rigidly coupled to the second gear; (i) a fourth gear rigidly coupled to the rotating structure and rotatably coupled to the thrid gear, (j) means for eccentrically revolving the second gear and the third gear with respect to the first gear and the fourth gear, respectively, whereby the first gear is angularly displaced with respect to the fourth gear.

Butler, L.

1988-04-19

99

Mobile Agents for Mobile Computing  

Microsoft Academic Search

Mobile agents are programs that can move through a network under their own control, migratingfrom host to host and interacting with other agents and resources on each. We argue thatthese mobile, autonomous agents have the potential to provide a convenient, efficient and robustprogramming paradigm for distributed applications, particularly when partially connected computersare involved. Partially connected computers include mobile computers such

Daniela Rus; David Kotz; George Cybenko; Robert Gray; Saurab Nog

1996-01-01

100

Biomolecule Analysis by Ion Mobility Spectrometry  

PubMed Central

Although nonnative protein conformations, including intermediates along the folding pathway and kinetically trapped misfolded species that disfavor the native state, are rarely isolated in the solution phase, they are often stable in the gas phase, where macromolecular ions from electrospray ionization can exist in varying charge states. Differences in the structures of nonnative conformations in the gas phase are often large enough to allow different shapes and charge states to be separated because of differences in their mobilities through a gas. Moreover, gentle collisional activation can be used to induce structural transformations. These new structures often have different mobilities. Thus, there is the possibility of developing a multidimensional separation that takes advantage of structural differences of multiple stable states. This review discusses how nonnative states differ in the gas phase compared with solution and presents an overview of early attempts to utilize and manipulate structures in order to develop ion mobility spectrometry as a rapid and sensitive technique for separating complex mixtures of biomolecules prior to mass spectrometry.

Bohrer, Brian C.; Merenbloom, Samuel I.; Koeniger, Stormy L.; Hilderbrand, Amy E.; Clemmer, David E.

2013-01-01

101

A Middleware for Adapting Context to Mobile and Collaborative Learning  

Microsoft Academic Search

The rapid and accelerating move toward the adoption and use of mobile and wireless technologies creates opportunity for new research field-'mobile learning' that includes a variety of applications and new learning techniques. An efficient mobile learning system has to be sensitive to the context that characterizes the interactions between humans, applications and the surrounding environment. Researches in context aware mobile

Jihen Malek; Alain Derycke; Mona Laroussi

2006-01-01

102

MANKALA: a traditional game developed for mobile use  

Microsoft Academic Search

The market for mobile games is expanding rapidly, and several games market in the advanced world are booming with sales, that has led us to the use of latest tools for mobile application development to modify and enhance an existing and traditional game to make it available for mobile users, Congkak game is developed for the latest mobile phones in

Aloysius Akpanobong; Oras F. Baker

2009-01-01

103

Research on Automatic Testing Technology Oriented Intelligent Mobile Terminal Software  

Microsoft Academic Search

With the rapid development of ubiquitous computing technology, software is widely used in the intelligent mobile terminals. How to improve the intelligent mobile terminal software quality is one of the hot topics in embedded software testing field. Combined with the developed intelligent mobile terminal software automatic testing environment, the intelligent mobile terminal software testing script technology (TST-IMTS) was proposed firstly.

Yongfeng Yin; Bin Liu; Chen Wang; Hongying Ni

2010-01-01

104

The Move to Mobile: Where Is a Campus's Place in the Mobile Space?  

ERIC Educational Resources Information Center

At the end of 2010, for the first time ever, smartphones outsold PCs. Mobile device adoption rates continue to rise rapidly around the world. A recent forecast by Cisco found that global mobile data traffic more than doubled last year, and by the end of 2012, the number of mobile devices in use will outnumber the world's population. In the United…

Lum, Lydia

2012-01-01

105

A Turning Point Analysis from Mobile Web 1.0 to Mobile Web 2.0: Lessons from Mobile Content Start-Up Company Growth and Downturn in Japan  

Microsoft Academic Search

The rapid growth of the mobile Internet in Japan leveraged new content providers specializing in the mobile Web. With the saturation of the Japanese mobile Internet, many content providers have faced downturns in the new landscape. Some exceptions provide hints for turning point analysis, and new directions for consumer-based mobile business. The author describes the current mobile Internet business model

Toshihiko Yamakami

2008-01-01

106

About RAPID  

Cancer.gov

The Rapid Access to Preventive Intervention Development (RAPID) Program makes the contract resources from NCI's Division of Cancer Prevention available to academic and academically-affiliated investigators for preclinical and early clinical drug development.

107

Mobile Homes.  

National Technical Information Service (NTIS)

Reporting on an exploratory study of HUD's participation in the mobile housing field in Region IX, this study was undertaken to determine if HUD has any processing or management problems with the 207 - m (mobile home park) program. It also was designed to...

1974-01-01

108

Mobile Forces  

NSDL National Science Digital Library

The application of engineering principles is explored in the creation of mobiles. As students create their own mobiles, they take into consideration the forces of gravity and convection air currents. They learn how an understanding of balancing forces is important in both art and engineering design.

Integrated Teaching And Learning Program

109

Mobile computing \\  

Microsoft Academic Search

Design competitions offer students an excellent way to gain hands-on experience in engineering and computer science courses. The University of Florida, in partnership with Motorola, has held two mobile computing design competitions. In Spring and Fall 2001, students in Abdelsalam Helal's Mobile Computing class designed killer apps for a Motorola smart phone.

S. F. Midkiff

2002-01-01

110

Attack Resistant Mobile Agents for Intrusion Detection Systems.  

National Technical Information Service (NTIS)

The rapid increase in attacks on computer systems has made intrusion detection systems (IDSs) increasingly popular. An emerging research area involves using mobile agents in implementing such systems. The lack of security for mobile agents is a primary fa...

J. W. Humphries

2001-01-01

111

Are mobile phones harmful?  

PubMed

There is increasing public interest in health risks of mobile phone use. Although there is a vast body of material on the biological effects of radiofrequency fields, current risk assessment is still limited. The article describes several hypotheses and results of biological effects such as thermal effect, genetic and carcinogenic effects and cancer related investigations. Mobile phones transmit and receive waves of frequencies mainly at 800-1800 MHz. Findings on the thermal effect of acute exposure to radiofrequency fields were consistent, resulting in an increase of cellular, tissue or body temperature by 1 degree C or more. Guidelines for risk limits are based on this thermal effect. Experimental investigation suggests that radiofrequency fields are not tumor initiators and that if they are related to carcinogenicity, this would be by tumor promotion or by increasing the uptake of carcinogens in cells. Implications of these experimental results on public health concerns are yet unclear. Few epidemiological studies are available on the use of mobile phones or on the radiofrequency exposure and the development of cancer. Most of these studies have no or little quantitative exposure data and they are limited by the small number of observations. Large epidemiological studies are necessary in order to investigate the use of mobile phones on the development of cancer. It should be emphasized that even a small elevated risk may have a large implication for public health, as the use of mobile phones and the exposure is rapidly increasing. PMID:11206998

Blettner, M; Berg, G

2000-01-01

112

Spatially varying dispersion to model breakthrough curves.  

PubMed

Often the water flowing in a karst conduit is a combination of contaminated water entering at a sinkhole and cleaner water released from the limestone matrix. Transport processes in the conduit are controlled by advection, mixing (dilution and dispersion), and retention-release. In this article, a karst transport model considering advection, spatially varying dispersion, and dilution (from matrix seepage) is developed. Two approximate Green's functions are obtained using transformation of variables, respectively, for the initial-value problem and for the boundary-value problem. A numerical example illustrates that mixing associated with strong spatially varying conduit dispersion can cause strong skewness and long tailing in spring breakthrough curves. Comparison of the predicted breakthrough curve against that measured from a dye-tracing experiment between Ames Sink and Indian Spring, Northwest Florida, shows that the conduit dispersivity can be as large as 400 m. Such a large number is believed to imply strong solute interaction between the conduit and the matrix and/or multiple flow paths in a conduit network. It is concluded that Taylor dispersion is not dominant in transport in a karst conduit, and the complicated retention-release process between mobile- and immobile waters may be described by strong spatially varying conduit dispersion. PMID:21143474

Li, Guangquan

2011-01-01

113

Modeling Mobility  

NASA Astrophysics Data System (ADS)

In wireless networks, communication can take place based on an infrastructure (e.g. WLAN access point or GPRS base station) or it can take place in adhoc mode, where mobile devices are connected directly to each other and care for the routing by themselves (mobile ad-hoc networks). When such wireless networks are investigated and simulations are performed, it is often necessary to consider the movement of entities within the simulated environment.

Berl, Andras

114

Digital Signature on Mobile Devices based on Location  

Microsoft Academic Search

With rapid growing of wireless and mobile technologies, mobile devices are part and parcel of our lives. Nowadays GPS (Global Positioning Service) technology is combined with mobile devices. People use some Internet applications, e.g. mobile fund transfer, e-commerce, game online and theatre booking. These applications should support digital signature service for more security. Because mobile device is low-computation capability and

Santi Jarusombat; Surin Kittitornkun

2006-01-01

115

The Investigation of Cloud-Computing-based Image Mining Mechanism in Mobile Communication WEB on Android  

Microsoft Academic Search

With the development of 3G network technology, the rapid upgrading of mobile phone hardware, and the refined requirements for mobile phones by mobile phone users, it is essential for mobile phones to be able to promptly and accurately process images. A mobile phone terminal sends the service requests to cloud computer system which then processes the requests and sends the

Cai-Dong Gu; Kan Lu; Jian-Ping Wu; Ying-li Fu; Jing-xiang Li; Chang-shui Xiao; Mao-xin Si; Zhao-bin Liu

2010-01-01

116

Molecular beam epitaxy growth of In{sub 0.52}Al{sub 0.48}As/In{sub 0.53}Ga{sub 0.47}As metamorphic high electron mobility transistor employing growth interruption and in situ rapid thermal annealing  

SciTech Connect

We investigated the effects of high temperature ({approx}700 deg. C) in situ rapid thermal annealing (RTA) carried out during growth interruption between spacer and {delta}-doping layers of an In{sub 0.52}Al{sub 0.48}As/In{sub 0.53}Ga{sub 0.47}As metamorphic high electron mobility transistor (MHEMT) grown on a compositionally graded InGaAlAs buffer layer. The in situ RTA improved optical and structural properties of the MHEMT without degradation of transport property, while postgrowth RTA improved the structural property of the MHEMT but significantly degraded mobility due to the defect-assisted Si diffusion. The results indicate the potential of the in situ RTA for use in the growth of high-quality metamorphic epitaxial layers for optoelectronic applications requiring improved optical and electrical properties.

Ihn, Soo-Ghang; Jo, Seong June; Song, Jong-In [Department of Information and Communications, Gwangju Institute of Science and Technology (GIST), 1 Oryong-dong, Buk-gu, Gwangju, 500-712 (Korea, Republic of)

2006-03-27

117

Get Your Mobile App Out the Door  

Microsoft Academic Search

\\u000a The increased speed and vast number of mobile products being released into the market has demanded that Oracle design and\\u000a develop mobile products faster. These applications must be innovative to stay competitive in the market place. We will present\\u000a a rapid design and research process that has been used to create a superior mobile expenses application. This process assisted\\u000a in

Heather Cottingham; Michele Snyder

118

Mobile wireless computing: challenges in data management  

Microsoft Academic Search

Mobile computing is a new emerging computing paradigm posing many challenging data managementproblems. We identify these new challenges and investigate their technical significance. New researchproblems include management of location dependent data, information services to mobile users, frequentdisconnections, wireless data broadcasting, and energy efficient data access.1 IntroductionThe rapidly expanding technology of cellular communications, wireless LAN, and satellite services will...

Tomasz Imielinski; B. R. Badrinath

1994-01-01

119

Design and Implementation of Mobile English Learning  

Microsoft Academic Search

With the rapid development of computer and the mobile communication technology, mobile learning arises at the historic moment, which makes people gain learning environment and resources anytime and anywhere. As English has the characters of weak systematic and trivial knowledge, we make a research of the development of resources to provide learners Flake Learning. Firstly, we make a research of

Shuyun Han; Weiliang Kong; Qingtang Liu; Lian Zhou

2010-01-01

120

Mobile health systems: A brief overview  

Microsoft Academic Search

Rapid advances in information technology and telecommunications, and more specifically wireless and mobile communications, and their convergence (telematics) are leading to the emergence of a new type of information infrastructure that has the potential of supporting an array of advanced services for healthcare. The objective of this paper is to provide a snapshot of the applications of mobile technology in

S. Voskarides; C. S. Pattichis; R. Istepanian; E. Kyriacou; M. S. Pattichis; C. N. Schizas

121

Supporting reconfigurable security policies for mobile programs  

Microsoft Academic Search

Programming models that support code migration have gained prominence, mainly due to a widespread shift from stand-alone to distributed applications. Although appealing in terms of system design and extensibility, mobile programs are a security risk and require strong access control. Further, the mobile code environment is fluid, i.e. the programs and resources located on a host may change rapidly, necessitating

Brant Hashii; Scott Malabarba; Raju Pandey; Matt Bishop

2000-01-01

122

A survey of mobile phone sensing  

Microsoft Academic Search

Mobile phones or smartphones are rapidly becoming the central computer and communication device in people's lives. Application delivery channels such as the Apple AppStore are transforming mobile phones into App Phones, capable of downloading a myriad of applications in an instant. Importantly, today's smartphones are programmable and come with a growing set of cheap powerful embedded sensors, such as an

Emiliano Miluzzo; Hong Lu; Daniel Peebles; Tanzeem Choudhury; Andrew T. Campbell

2010-01-01

123

DGPS for Mobile Users: A Mobile Agent Approach  

Microsoft Academic Search

As the computational power of mobile devices increases, so does the demand for more sophisticated applications and services. In particular the demand for location-aware services is likely to increase substantially. Such services will vary in how accurate a position solution they will require. However, there can be little doubt that some will require an accuracy that can only be provided

M. J. O'Grady; G. M. P. O'Hare

2004-01-01

124

Mobility and Orientation Instruction of Blind Persons.  

ERIC Educational Resources Information Center

A peripatologist taught 102 blind and partially sighted individuals of all ages mobility and orientation techniques. Volunteers assisted with transportation, followup, consultation, and direct teaching of mobility. Over a 3-year period, the number of lessons per client varied from one to 86, and the number of hours spent by the instructor in…

Luini, Eugene; Ryder, James

125

Interoperability between nomadic, mobile middleware platforms  

Microsoft Academic Search

Traditional middleware platforms arena has mature middleware platforms, which today typically interoperate through web services. The emerging mobile middleware arena is the opposite: requirements are unclear, research platforms do not interoperate and the mobility of users brings additional challenges such as disconnected operations, energy awareness and low, varying bandwidth and need for dynamic reconfiguration. This paper focuses on providing an

Tuomas Nurmela

126

Mobile Collector for Field Trips  

ERIC Educational Resources Information Center

Current e-Learning is based on learning management systems that provide certain standard services--course authoring and delivery, tutoring, administration and collaboration facilities. Rapid development of mobile technologies opens a new area of m-Learning to enhance the current educational opportunities. Field trips are a relevant part of the…

Kravcik, Milos; Kaibel, Andreas; Specht, Marcus; Terrenghi, Lucia

2004-01-01

127

Varying /c and particle horizons  

NASA Astrophysics Data System (ADS)

We explore what restrictions may impose the second law of thermodynamics on varying speed of light theories. We find that the attractor scenario solving the flatness problem is consistent with the generalized second law at late time.

Chimento, L. P.; Jakubi, A. S.; Pavón, D.

2001-05-01

128

Social Mobility and Equality.  

ERIC Educational Resources Information Center

Social mobility is generally studied in three different ways: stratum mobility, intergenerational social mobility, and intragenerational or career mobility. This paper deals with the first two types of mobility and more with intergenerational mobility than with stratum mobility. The working hypothesis of both discussions is that, in general, a…

Miller, S. M.

129

Transnational Academic Mobility and Gender  

ERIC Educational Resources Information Center

This paper examines to what extent the participation of researchers in transnational academic mobility, their experiences and perceived outcomes vary by gender. Based on longitudinal statistics, original survey data and semi-structured interviews with former visiting researchers in Germany, the paper shows that the academic world of female…

Jons, Heike

2011-01-01

130

Epidemic spreading in time-varying community networks  

NASA Astrophysics Data System (ADS)

The spreading processes of many infectious diseases have comparable time scale as the network evolution. Here, we present a simple networks model with time-varying community structure, and investigate susceptible-infected-susceptible epidemic spreading processes in this model. By both theoretic analysis and numerical simulations, we show that the efficiency of epidemic spreading in this model depends intensively on the mobility rate q of the individuals among communities. We also find that there exists a mobility rate threshold qc. The epidemic will survive when q > qc and die when q < qc. These results can help understanding the impacts of human travel on the epidemic spreading in complex networks with community structure.

Ren, Guangming; Wang, Xingyuan

2014-06-01

131

Mobile Learning and Mobility in Teacher Training  

Microsoft Academic Search

This article describes the mobile learning project, where a mobile device is used for educational activities. The article defines the word mobility from the educational point of view. The main perspective in this article is in teacher training. We present experiences of how mobile technology was used in teacher training, how trainees and supervising teachers felt the use of mobile

Pauliina Seppälä; Harri Alamäki

2002-01-01

132

Mars Mobiles  

NSDL National Science Digital Library

This activity introduces students to the basic features of the Mars landscape. Students locate the planets of the solar system on a diagram; look at pictures of Mars and describe the Martian landscape; describe landscape features of Earth, and compare those to what is found on Mars; and make mobiles showing features of the Martian landscape.

133

Atomic Mobile  

NSDL National Science Digital Library

Learners make a mobile model of a carbon atom using clay, wire, and pipe cleaners. Learners will use the periodic table as a guide and explore how atoms are made up of a nucleus of protons and neutrons with orbiting electrons. The activity includes a PDF file of a periodic table and a guide for reading it.

History, American M.

2012-06-26

134

Mobile IP  

Microsoft Academic Search

The Internet is growing exponentially, both in the amount of traffic carried, and in the amount of hosts connected. IP technology is becoming more and more important, in company networks (Intranets), and also in the core networks for the next generation mobile networks. Further, wireless access to IP networks is becoming mature (e.g., IEEE 802.11 networks, Irda, Bluetooth). At the

Geert Heijenk; S. Sallent; A. Pras

1999-01-01

135

Learning Resource Adaptation and Delivery Framework for Mobile Learning  

Microsoft Academic Search

With the rapid development of wireless networks and mobile devices, mobile learning has got more and more attention. However, most of current learning resources (LR) were designed with desktop computers and high-speed network connections. Moreover, for different user preferences in mobile learning environment, not all of the data are relevant and critical to the learning process. It is a challenge

Zhao Gang; Yang Zongkai

2005-01-01

136

The comparative study of Chinese mainstream mobile learning software  

Microsoft Academic Search

As the rapid development of mobile technology and wireless networks, the application prospects of mobile learning is getting more and more broad. My work aimed at the current four major mobile learning software, Nokia's “Mobiledu”, Digidea's “Englishto”, Unbounded Learning's “Drop English”, “Learneasy” soft to make a comparative analysis of their interface design, technical support and content design. The analysis has

Baojing Zhang; Jing Liu; Jun Han; Hongyun Xu

2010-01-01

137

Fast app launching for mobile devices using predictive user context  

Microsoft Academic Search

As mobile apps become more closely integrated into our everyday lives, mobile app interactions ought to be rapid and responsive. Unfortunately, even the basic primitive of launching a mobile app is sorrowfully sluggish: 20 seconds of delay is not uncommon even for very popular apps. We have designed and built FALCON to remedy slow app launch. FALCON uses contexts such

Tingxin Yan; David Chu; Deepak Ganesan; Aman Kansal; Jie Liu

2012-01-01

138

Time-Varying Contour Topology  

PubMed Central

The contour tree has been used to compute the topology of isosurfaces, generate a minimal seed set for accelerated isosurface extraction, and provide a user interface to segment individual contour components in a scalar field. In this paper, we extend the benefits of the contour tree to time-varying data visualization. We define temporal correspondence of contour components and describe an algorithm to compute the correspondence information in time-dependent contour trees. A graph representing the topology changes of time-varying isosurfaces is constructed in real-time for any selected isovalue using the precomputed correspondence information. Quantitative properties, such as surface area and volume of contour components, are computed and labeled on the graph. This topology change graph helps users to detect significant topological and geometric changes in time-varying isosurfaces. The graph is also used as an interactive user interface to segment, track. and visualize the evolution of any selected contour components over time.

Sohn, Bong-Soo; Bajaj, Chandrajit

2009-01-01

139

Mobile payment in mobile e-commerce  

Microsoft Academic Search

The main problem of Chinese mobile e-commerce at present is its insufficient modes of payment. Therefore, the research on brand-new and high-efficiency form of mobile payment is very important for the development of Chinese mobile e-commerce. There are two forms of mobile payment in China at present, namely mobile fee account payment and bank card mobile payment. The paper brings

Qinghua Zhang

2008-01-01

140

Mobile Customer Relationship Management and Mobile Security  

NASA Astrophysics Data System (ADS)

The purpose of this study is twofold. First, in order to guarantee a coherent discussion about mobile customer relationship management (mCRM), this paper presents a conceptualization of mCRM delineating its unique characteristics because of Among the variety of mobile services, considerable attention has been devoted to mobile marketing and in particular to mobile customer relationship management services. Second, the authors discusses the security risks in mobile computing in different level(user, mobile device, wireless network,...) and finally we focus on enterprise mobile security and it's subgroups with a series of suggestion and solution for improve mobile computing security.

Sanayei, Ali; Mirzaei, Abas

141

Mobility Types for Mobile Ambients  

Microsoft Academic Search

An ambient is a named cluster of processes and subambients, whichmoves as a group. The untyped ambient calculus is a process calculusin which ambients model a variety of concepts such as network nodes,packets, channels, and software agents. In these models, some ambientsare intended to be mobile, some immobile; and some are intendedto be ephemeral, some persistent. We describe type systems

Luca Cardelli; Andrew D. Gordon; Giorgio Ghelli

1999-01-01

142

A Mobile Tool for Learning English Words  

ERIC Educational Resources Information Center

Technology is changing very rapidly and nearly all branches of education are affected by these changes. As a result of these rapid changes there has been significant interest and growth in the number of educational institutions using mobile devices to support learning and teaching. There is also an increase use of wireless technologies in…

Cavus, Nadire; Ibrahim, Dogan

2008-01-01

143

Understanding Mobile Apps  

MedlinePLUS

... Mobile App User Reviews Kids and Mobile Apps Mobile App Basics What’s a mobile app? A mobile app is a software program you ... on the market, including some with free versions. Mobile App User Reviews Can I trust all the user ...

144

Mobile access control vestibule  

NASA Astrophysics Data System (ADS)

The mobile access control vestibule (MACV) is an adaptation of techniques developed for mobile military command centers. The overall configuration of modules acts as an entry control/screening facility or transportable command center. The system would provide the following capabilities: (1) A key element for force protection, rapid deployment units sent to areas having no prepositioned equipment or where there has been a degradation of that equipment as a result of natural disasters or civil unrest. (2) A rapidly deployable security control center to upgrade the security at nonmilitary sites (e.g., diplomatic or humanitarian organizations). (3) Personnel screening, package screening, badge/identification card production for authorized personnel, centralized monitoring of deployed perimeter sensors, and centralized communications for law enforcement personnel. (4) Self-contained screening and threat detection systems, including explosives detection using the system developed by Sandia National Laboratories for the FAA. When coupled with transportable electric generators, the system is self-sufficient. The communication system for the MACV would be a combination of physically wired and wireless communication units that supports by ad hoc networking.

Depoy, Jennifer M.

1998-12-01

145

Mobile Gamification in EducationEngage, Educate and Entertain via Gamified Mobile Apps  

Microsoft Academic Search

Digital games are very popular amongst the digital natives; they use them for entertainment engagement, enjoyment and fun. With the emergence of the internet and mobile apps edutainment and gamification is also becoming increasingly important in the educational sector. With the rapid development of mobile technologies and applications, games are now entering a new era where their purpose is no

Ferial Khaddage; Christoph Lattemann; Ricardo Acosta-Díaz

2014-01-01

146

A mobility-based cluster formation algorithm for wireless mobile ad-hoc networks  

Microsoft Academic Search

In the last decade, numerous efforts have been devoted to design efficient algorithms for clustering the wireless mobile ad-hoc\\u000a networks (MANET) considering the network mobility characteristics. However, in existing algorithms, it is assumed that the\\u000a mobility parameters of the networks are fixed, while they are stochastic and vary with time indeed. Therefore, the proposed\\u000a clustering algorithms do not scale well

Mohammad Reza Meybodi

147

Topobathymetric model of Mobile Bay, Alabama  

USGS Publications Warehouse

Topobathymetric Digital Elevation Models (DEMs) are a merged rendering of both topography (land elevation) and bathymetry (water depth) that provides a seamless elevation product useful for inundation mapping, as well as for other earth science applications, such as the development of sediment-transport, sea-level rise, and storm-surge models. This 1/9-arc-second (approximately 3 meters) resolution model of Mobile Bay, Alabama was developed using multiple topographic and bathymetric datasets, collected on different dates. The topographic data were obtained primarily from the U.S. Geological Survey (USGS) National Elevation Dataset (NED) (http://ned.usgs.gov/) at 1/9-arc-second resolution; USGS Experimental Advanced Airborne Research Lidar (EAARL) data (2 meters) (http://pubs.usgs.gov/ds/400/); and topographic lidar data (2 meters) and Compact Hydrographic Airborne Rapid Total Survey (CHARTS) lidar data (2 meters) from the U.S. Army Corps of Engineers (USACE) (http://www.csc.noaa.gov/digitalcoast/data/coastallidar/). Bathymetry was derived from digital soundings obtained from the National Oceanic and Atmospheric Administration’s (NOAA) National Geophysical Data Center (NGDC) (http://www.ngdc.noaa.gov/mgg/geodas/geodas.html) and from water-penetrating lidar sources, such as EAARL and CHARTS. Mobile Bay is ecologically important as it is the fourth largest estuary in the United States. The Mobile and Tensaw Rivers drain into the bay at the northern end with the bay emptying into the Gulf of Mexico at the southern end. Dauphin Island (a barrier island) and the Fort Morgan Peninsula form the mouth of Mobile Bay. Mobile Bay is 31 miles (50 kilometers) long by a maximum width of 24 miles (39 kilometers) with a total area of 413 square miles (1,070 square kilometers). The vertical datum of the Mobile Bay topobathymetric model is the North American Vertical Datum of 1988 (NAVD 88). All the topographic datasets were originally referenced to NAVD 88 and no transformations were made to these input data. The NGDC hydrographic, multibeam, and trackline surveys were transformed from mean low water (MLW) or mean lower low water (MLLW) to NAVD 88 using VDatum (http://vdatum.noaa.gov). VDatum is a tool developed by the National Geodetic Survey (NGS) that performs transformations among tidal, ellipsoid-based, geoid-based, and orthometric datums using calibrated hydrodynamic models. The vertical accuracy of the input topographic data varied depending on the input source. Because the input elevation data were derived primarily from lidar, the vertical accuracy ranges from 6 to 20 centimeters in root mean square error (RMSE). he horizontal datum of the Mobile Bay topobathymetric model is the North American Datum of 1983 (NAD 83), geographic coordinates. All the topographic and bathymetric datasets were originally referenced to NAD 83, and no transformations were made to the input data. The bathymetric surveys were downloaded referenced to NAD 83 geographic, and therefore no horizontal transformations were required. The topbathymetric model of Mobile Bay and detailed metadata can be obtained from the USGS Web sites: http://nationalmap.gov/.

Danielson, Jeffrey J.; Brock, John C.; Howard, Daniel M.; Gesch, Dean B.; Bonisteel-Cormier, Jamie M.; Travers, Laurinda J.

2013-01-01

148

Qualitative analysis of universes with varying alpha  

NASA Astrophysics Data System (ADS)

Assuming a Friedmann universe which evolves with a power-law scale factor, a = t n, we analyse the phase space of the system of equations that describes a time-varying fine structure 'constant', ?, in the Bekenstein-Sandvik-Barrow-Magueijo generalization of general relativity. We have classified all the possible behaviours of ?(t) in ever-expanding universes with different n and find new exact solutions for ?(t). We find the attractor points in the phase space for all n. In general, ? will be a non-decreasing function of time that increases logarithmically in time during a period when the expansion is dust dominated (n = 2/3), but becomes constant when n > 2/3. This includes the case of negative-curvature domination (n = 1). ? also tends rapidly to a constant when the expansion scale factor increases exponentially. A general set of conditions is established for ? to become asymptotically constant at late times in an expanding universe.

Barrow, John D.; Mota, David F.

2002-12-01

149

Mobile Agent Middleware for Mobile Computing  

Microsoft Academic Search

Mobile computing requires an advanced infrastructure that integrates suitable support protocols, mechanisms, and tools. This mobility middleware should dynamically reallocate and trace mobile users and terminals and permit communication and coordination of mobile entities. In addition, open and untrusted environments must overcome system heterogeneity and grant the appropriate security level. Solutions to these issues require compliance with standards to interoperate

Paolo Bellavista; Antonio Corradi; Cesare Stefanelli

2001-01-01

150

Anchored mobilities: mobile technology and transnational migration  

Microsoft Academic Search

Mobile technologies are deployed into diverse social, cultural, political and geographic settings, and incorporated into diverse forms of personal and collective mobility. We present an ethnography of transnational Thai retirees and their uses of mobile technology, highlighting forms of mobility that are spatially, temporally, and infrastructurally anchored, and concepts of the house as a kinship network that may be globally

Amanda Williams; Ken Anderson; Paul Dourish

2008-01-01

151

Time varying Hierarchical Archimedean Copulae  

Microsoft Academic Search

There is increasing demand for models of time-varying and non-Gaussian dependencies for mul- tivariate time-series. Available models suffer from the curse of dimensionality or restrictive assumptions on the parameters and the distribution. A promising class of models are the hierarchical Archimedean copulae (HAC) that allow for non-exchangeable and non-Gaussian dependency structures with a small number of parameters. In this paper

Wolfgang Karl Härdle; Ostap Okhrin; Yarema Okhrin

2010-01-01

152

Carrier mobility of pyrolyzed polyimide films  

NASA Astrophysics Data System (ADS)

The carrier mobility of pyrolyzed polyimide films was estimated by the time-of-flight technique. The carrier mobility could be estimated for the polyimides pyrolyzed between 480 and 530 C, which possessed conductivities between 10 to the -12th and 10 to the -8th S/cm and mobilities ranging from 10 to the -7th to 10 to the -3rd sq cm/V s. The number of carriers connected with charge transport remained unchanged even when the pyrolysis temperature was varied from 490 to 530 C, as the conductivity was proportional to the mobility. In polyimides pyrolyzed at lower temperatures, below 490 C, a deviation from the close relation between the mobility and the conductivity was observed. These results suggest that the carrier density increases at the initial stage of the pyrolysis, and then the increase of the mobility becomes predominant as the pyrolysis progresses.

Hara, T.; Tsutsui, T.; Saito, S.

1985-08-01

153

Atomic Mobile  

NSDL National Science Digital Library

In this hands-on OLogy activity, kids learn about matter by building their own models of carbon out of pipe cleaners, wire, and clay. The activity begins with a kid-friendly introduction to matter, elements, and atoms. The illustrated, step-by-step directions show how to use the information about carbon on the Periodic Table to create a mobile that shows the element's basic structure. A PDF version of the Periodic Table, along with a kid-friendly overview of how to read it, is also included.

154

An overview of mobile assisted language learning: From content delivery to supported collaboration and interaction  

Microsoft Academic Search

Mobile learning is undergoing rapid evolution. While early generations of mobile learning tended to propose activities that were carefully crafted by educators and technologists, learners are increasingly motivated by their personal learning needs, including those arising from greater mobility and frequent travel. At the same time, it is often argued that mobile devices are particularly suited to supporting social contacts

Agnes Kukulska-Hulme; Lesley Shield

2008-01-01

155

Mobile Technologies for Enhancing eHealth Solutions in Developing Countries  

Microsoft Academic Search

The high penetration of mobile devices and networks globally implies that mobile technologies can be used very effectively in the field of Healthcare in order to compensate the scarcity of resources problem, particularly in developing countries. With the proliferation of mobile technologies, mobile health (mHealth) will play a vital role in the rapidly growing electronic health (eHealth) area. The form

Dinusha Vatsalan; Shiromi Arunatileka; Keith Chapman; Gihan Senaviratne; Saatviga Sudahar; Dulindra Wijetileka; Yvonne Wickramasinghe

2010-01-01

156

A Framework for the Study of Customer Interface Design for Mobile Commerce  

Microsoft Academic Search

The rapid growth of mobile telephony has fueled the expansion of the mo- bile Internet as a foundation for mobile commerce. Proponents claim that mobile com- merce will surpass electronic commerce in growth and scope, but there is as yet no commonly accepted framework for the study of interface design for mobile commerce. Using Rayport and Jaworski's 7C's—the seven design

Young Eun Lee; Izak Benbasat

2004-01-01

157

Determinants of Mobile Learning Acceptance: An Empirical Investigation in Higher Education  

ERIC Educational Resources Information Center

Scope and method of study: The purpose of this study was to investigate the determinants of mobile learning acceptance in higher education. Mobile learning is a rapidly growing method of learning that utilizes mobile devices to deliver content. Acceptance of mobile learning theory was derived from technology acceptance theories. The study…

Akour, Hassan

2010-01-01

158

Mobile-Agent versus Client\\/Server Performance: Scalability in an Information-Retrieval Task  

Microsoft Academic Search

. Building applications with mobile agents often reduces thebandwidth required for the application, and improves performance. Thecost is increased server workload. There are, however, few studies of thescalability of mobile-agent systems. We present scalability experimentsthat compare four mobile-agent platforms with a traditional client\\/serverapproach. The four mobile-agent platforms have similar behavior, buttheir absolute performance varies with underlying implementation...

Robert S. Gray; David Kotz; Ronald A. Peterson; Joyce Barton; Daria A. Chacón; Peter Gerken; Martin O. Hofmann; Jeffrey M. Bradshaw; Maggie R. Breedy; Renia Jeffers; Niranjan Suri

2001-01-01

159

Trends in mobile Augmented Reality  

Microsoft Academic Search

This tutorial provides a detailed introduction to mobile Augmented Reality (AR). AR is a key user-interface technology for personalized, situated information delivery, navigation, on-demand instruction and games. The widespread availability and rapid evolution of smartphones enables software-only solutions for AR where it was previously necessary to assemble custom hardware solutions. However, ergonomic and technical limitations of smartphones as a platform

Dieter Schmalstieg; Tobias Hollerer

2012-01-01

160

33 CFR 165.835 - Security Zone; Port of Mobile, Mobile Ship Channel, Mobile, AL.  

Code of Federal Regulations, 2011 CFR

...Security Zone; Port of Mobile, Mobile Ship Channel, Mobile, AL. 165.835 Section...Security Zone; Port of Mobile, Mobile Ship Channel, Mobile, AL. (a) Definition. As used in this section— Cruise ship means a passenger vessel...

2011-07-01

161

33 CFR 165.835 - Security Zone; Port of Mobile, Mobile Ship Channel, Mobile, AL.  

Code of Federal Regulations, 2012 CFR

...Security Zone; Port of Mobile, Mobile Ship Channel, Mobile, AL. 165.835 Section...Security Zone; Port of Mobile, Mobile Ship Channel, Mobile, AL. (a) Definition. As used in this section— Cruise ship means a passenger vessel...

2012-07-01

162

33 CFR 165.835 - Security Zone; Port of Mobile, Mobile Ship Channel, Mobile, AL.  

Code of Federal Regulations, 2010 CFR

...Security Zone; Port of Mobile, Mobile Ship Channel, Mobile, AL. 165.835 Section 165.835 Navigation and Navigable Waters...Security Zone; Port of Mobile, Mobile Ship Channel, Mobile, AL. (a) Definition. As used in this sectionâ Cruise...

2009-07-01

163

33 CFR 165.835 - Security Zone; Port of Mobile, Mobile Ship Channel, Mobile, AL.  

Code of Federal Regulations, 2010 CFR

...Security Zone; Port of Mobile, Mobile Ship Channel, Mobile, AL. 165.835 Section 165.835 Navigation and Navigable Waters...Security Zone; Port of Mobile, Mobile Ship Channel, Mobile, AL. (a) Definition. As used in this sectionâ Cruise...

2010-07-01

164

33 CFR 165.835 - Security Zone; Port of Mobile, Mobile Ship Channel, Mobile, AL.  

Code of Federal Regulations, 2013 CFR

...Security Zone; Port of Mobile, Mobile Ship Channel, Mobile, AL. 165.835 Section...Security Zone; Port of Mobile, Mobile Ship Channel, Mobile, AL. (a) Definition. As used in this sectionâ Cruise ship means a passenger vessel...

2013-07-01

165

Mobile shearography  

NASA Astrophysics Data System (ADS)

By reason of their sensitivity, accuracy and non-contact as well as non-destructive characteristics, modern optical methods such as digital speckle shearography have found an increasing interest for NDT applications on the factory floor. With new carbon filter technologies and other lightweight constructions in aircraft and automotive manufacturing, adapted examination designs and especially developed testing methods are necessary. Shearography as a coherent optical method has been widely accepted as an useful NDT tool. It is a robust interferometric method to determine locations with maximum stress on various material structures. However, limitations of this technique can be found in the bulky equipment components, the interpretation of the complex sherographic result images and at the work with non-cooperative surfaces (dark absorber, bright shining reflectors). We report a mobile shearography system that was especially designed for investigations at aircraft and automotive constructions.

Kalms, Michael; Jueptner, Werner

2005-04-01

166

Generalized theory of varying alpha  

NASA Astrophysics Data System (ADS)

In this paper, we formulate a generalization of the simple Bekenstein-Sandvik-Barrow-Magueijo theory of varying alpha by allowing the coupling constant ? for the corresponding scalar field ? to depend on ?. We focus on the situation where ? is exponential in ? and find the late-time behaviors that occur in matter-dominated and dark-energy dominated cosmologies. We also consider the situation when the background expansion scale factor of the Universe evolves in proportion to an arbitrary power of the cosmic time. We find the conditions under which the fine-structure “constant” increases with time, as in the Bekenstein-Sandvik-Barrow-Magueijo theory, and establish a cosmic no-hair behavior for accelerating universes. We also find the conditions under which the fine-structure constant can decrease with time and compare the whole family of models with astronomical data from quasar absorption spectra.

Barrow, John D.; Lip, Sean Z. W.

2012-01-01

167

Continuously Connected With Mobile IP  

NASA Technical Reports Server (NTRS)

Cisco Systems developed Cisco Mobile Networks, making IP devices mobile. With this innovation, a Cisco router and its connected IP devices can roam across network boundaries and connection types. Because a mobile user is able to keep the same IP address while roaming, a live IP connection can be maintained without interruption. Glenn Research Center jointly tested the technology with Cisco, and is working to use it on low-earth-orbiting research craft. With Cisco's Mobile Networks functionality now available in Cisco IOS Software release 12.2(4)T, the commercial advantages and benefits are numerous. The technology can be applied to public safety, military/homeland security, emergency management services, railroad and shipping systems, and the automotive industry. It will allow ambulances, police, firemen, and the U.S. Coast Guard to stay connected to their networks while on the move. In the wireless battlefield, the technology will provide rapid infrastructure deployment for U.S. national defense. Airline, train, and cruise passengers utilizing Cisco Mobile Networks can fly all around the world with a continuous Internet connection. Cisco IOS(R) Software is a registered trademark of Cisco Systems.

2002-01-01

168

Concordia: An Infrastructure for Collaborating Mobile Agents  

Microsoft Academic Search

Use of the Internet and the World-Wide-Web has become widespread in recent years and mobile agent technology has proliferated at an equally rapid rate. In this paper, we introduce the Concordia infrastructure for the development and management of network-efficient mobile agent applications for accessing information anytime, anywhere, and on any device. Concordia has been implemented in the Java language to

David Wong; Noemi Paciorek; Tom Walsh; Joe Dicelie; Mike Young; Bill Peet

1997-01-01

169

Mobile analytics for emergency response and training  

Microsoft Academic Search

During emergency response events, situational awareness is critical in effec- tively managing and safe-guarding civilians and in-field personnel. To better support both command center controllers and in-field operators, we have developed a mobile visual analytics tool to help enhance situational aware- ness and support rapid decision making. Our mobile visual analytics tool consists of a 2D\\/3D visualization component, which shows

Sungye Kim; Ross Maciejewski; Karl Ostmo; Edward J. Delp; Timothy F. Collins; David S. Ebert

2008-01-01

170

Mobility Times. Volume 7.  

National Technical Information Service (NTIS)

Purpose: The Mobility Times periodical is published quarterly by Mobility Concepts Agency (MCA) located at Fort Monroe, Virginia. MCA is a multi-Service organization sponsored by the Army Training and Doctrine Command (TRADOC) and the Air Mobility Command...

1996-01-01

171

Mobility Times. Volume 8.  

National Technical Information Service (NTIS)

The Mobility Times periodical is published quarterly by Mobility Concepts Agency (MCA) located at Fort Monroe, Virginia. MCA is a multi-Service organization sponsored by the Army Training and Doctrine Command (TRADOC) and the Air Mobility Command (AMC). T...

1996-01-01

172

Mobile Customer Relationship Management and Mobile Security  

Microsoft Academic Search

The purpose of this study is twofold. First, in order to guarantee a coherent discussion about mobile customer relationship\\u000a management (mCRM), this paper presents a conceptualization of mCRM delineating its unique characteristics because of Among\\u000a the variety of mobile services, considerable attention has been devoted to mobile marketing and in particular to mobile customer\\u000a relationship management services. Second, the authors

Ali Sanayei; Abas Mirzaei

2008-01-01

173

Device Data Protection in Mobile Healthcare Applications  

NASA Astrophysics Data System (ADS)

The rapid growth in mobile technology makes the delivery of healthcare data and services on mobile phones a reality. However, the healthcare data is very sensitive and has to be protected against unauthorized access. While most of the development work on security of mobile healthcare today focuses on the data encryption and secure authentication in remote servers, protection of data on the mobile device itself has gained very little attention. This paper analyses the requirements and the architecture for a secure mobile capsule, specially designed to protect the data that is already on the device. The capsule is a downloadable software agent with additional functionalities to enable secure external communication with healthcare service providers, network operators and other relevant communication parties.

Weerasinghe, Dasun; Rajarajan, Muttukrishnan; Rakocevic, Veselin

174

Mobile Schools for a Mobile World  

ERIC Educational Resources Information Center

Overwhelmingly, independent schools are embracing mobile devices--laptops, iPads or other tablets, and smartphones--to enhance teaching and learning. This article describes the results of the "NAIS 2012 Mobile Learning Survey." Among its findings were that 75 percent of NAIS-member schools currently use mobile learning devices in at…

Booth, Susan

2013-01-01

175

Mobile robot kinematic, dynamic, and mobility  

Microsoft Academic Search

Presents an optimal trajectography planning for a mobile robot in a crowded environment. A dynamic model based on the Euler-Lagrange equations is developed and a mobility estimation function of the robot is considered. This dynamic estimation of the robot mobility takes into account the velocity and the orientation of the robot. Finally, the optimal trajectory search is formulated as a

A. Khoukhi; Y. Hamam

1991-01-01

176

Epidemic spreading in time-varying community networks.  

PubMed

The spreading processes of many infectious diseases have comparable time scale as the network evolution. Here, we present a simple networks model with time-varying community structure, and investigate susceptible-infected-susceptible epidemic spreading processes in this model. By both theoretic analysis and numerical simulations, we show that the efficiency of epidemic spreading in this model depends intensively on the mobility rate q of the individuals among communities. We also find that there exists a mobility rate threshold qc. The epidemic will survive when q?>?qc and die when q?

Ren, Guangming; Wang, Xingyuan

2014-06-01

177

Note: Integration of trapped ion mobility spectrometry with mass spectrometry.  

PubMed

The integration of a trapped ion mobility spectrometer (TIMS) with a mass spectrometer (MS) for complementary fast, gas-phase mobility separation prior to mass analysis (TIMS-MS) is described. The ion transmission and mobility separation are discussed as a function of the ion source condition, bath gas velocity, analysis scan speed, RF ion confinement, and downstream ion optical conditions. TIMS mobility resolution depends on the analysis scan speed and the bath gas velocity, with the unique advantage that the IMS separation can be easily tuned from high speed (~25 ms) for rapid analysis to slower scans for higher mobility resolution (R > 80). PMID:22225261

Fernandez-Lima, F A; Kaplan, D A; Park, M A

2011-12-01

178

Note: Integration of trapped ion mobility spectrometry with mass spectrometry  

PubMed Central

The integration of a trapped ion mobility spectrometer (TIMS) with a mass spectrometer (MS) for complementary fast, gas-phase mobility separation prior to mass analysis (TIMS-MS) is described. The ion transmission and mobility separation are discussed as a function of the ion source condition, bath gas velocity, analysis scan speed, RF ion confinement, and downstream ion optical conditions. TIMS mobility resolution depends on the analysis scan speed and the bath gas velocity, with the unique advantage that the IMS separation can be easily tuned from high speed (?25 ms) for rapid analysis to slower scans for higher mobility resolution (R > 80).

Fernandez-Lima, F. A.; Kaplan, D. A.; Park, M. A.

2011-01-01

179

Situational Effects on the Usage Intention of Mobile Games  

NASA Astrophysics Data System (ADS)

As value-added services on mobile devices are developing rapidly, text messaging, multi-media messaging, music, video, games, GPS navigation, RFID, and mobile TV are all accessible from a single device. Mobile games that combine mobile communication with computer games are an emerging industry. The purpose of this research is to explore what situation factors may affect the intention to play mobile game. We propose a research model to fit the nature of mobile games and conducted an online survey to examine the effect of situational factors. The model integrates constructs in TAM and TRA. The findings are as follows. First, Subjective norm affects a user’s intention in using mobile games when a user has no other task. Second, perceived playfulness affects a user’s intention to use mobile games when the user has another task.

Liang, Ting-Peng; Yeh, Yi-Hsuan

180

Signaling Load of Hierarchical Mobile IPv6 Protocol in IPv6 Networks  

Microsoft Academic Search

\\u000a Hierarchical Mobile IPv6 (HMIPv6) has been proposed to accommodate frequent mobility of the mobile nodes and reduce the signaling\\u000a load in the Internet. Though it is being considered as an efficient local mobility management protocol, its performance may\\u000a vary widely depending on the various mobility and traffic related parameters. Therefore, it is essential to investigate the\\u000a effects of these parameters

Ki-sik Kong; Sung-ju Roh; Chong-sun Hwang

2004-01-01

181

Customizing Mobile Applications  

Microsoft Academic Search

The dynamics of mobile systems require applications to intelligently adapt to changes in system configurations and to their environment. We describe a workplace in which users interact with a number of stationary and mobile systems through the course of a day. The relationship between systems and devices is constantly changing due to user mobility. We present a facility for mobile

Bill N. Schilit; Marvin M. Theimer; Brent B. Welch

182

Mobile Agents White Paper  

Microsoft Academic Search

this paper.IntroductionNew productsNew applicationsNew networksAbout "Mobile Agents"Enabling mobile agentsMobile agent paradigmMobile agent conceptsMobile agent technologyProgramming mobile agentsProgramming a placeProgramming an agentUsing mobile agentsMonitoring changing conditionsDoing time-consuming legworkUsing services in combinationThe user experienceHow agents provide the experienceVariations on the themeAcknowledgmentsRelated workReferencesIntroduction

Jim White

1996-01-01

183

Varying the spherical shell geometry in rotating thermal convection  

Microsoft Academic Search

The effect of spherical shell geometry on rapidly-rotating thermal convection is studied in a suite of high resolution three-dimensional numerical simulations. The geometry is characterized by the radius ratio, ? = ri\\/ro, where ri is the inner shell radius, and ro is the outer shell radius. In this study, ? is varied over the broad range 0.10 to 0.92 in

F. M. Al-Shamali; M. H. Heimpel; J. M. Aurnou

2004-01-01

184

Holographic flow visualization of time-varying shock waves  

NASA Technical Reports Server (NTRS)

Rapid-double-exposure, diffuse-illumination holography is evaluated analytically and experimentally as a flow visualization method for time-varying shock waves. Conditions are determined that minimize the distance (localization error) between the surface or curve of interference-fringe localization and the shock surface. Treated specifically are the cases of shock waves in a transonic compressor rotor for which there is laser anemometer data for comparison and shock waves in a flutter cascade.

Decker, A. J.

1981-01-01

185

Smartphones Enabling Mobile Collaboration  

Microsoft Academic Search

Mobilization of the work-force is demanding new mobile and wireless technologies to facilitate contact between the growing number of mobile eWorkers and organizations. Smartphones incorporating mobile e-mail functionality enable instant access to e-mail boxes and company resources without complex synchronization. A study amongst sixteen German companies was conducted to elicit the influence of mobile e-mail on work-processes and communication. The

Bettina Beurer-zuellig; Miriam Meckel

2008-01-01

186

Mobile IPv6 Security  

Microsoft Academic Search

Mobile IPv6 provides global mobility and location management support for the IPv6 network layer protocol. The design of Mobile IPv6 incorporates security features that differ significantly from its predecessor, Mobile IPv4. Some of the new security features are intended to counter new threats raised by route optimization, while others align Mobile IPv6 security more closely with basic IPv6 security mechanisms.

James Kempf; Jari Arkko; Pekka Nikander

2004-01-01

187

Toward a North American Standard for Mobile Data Services.  

National Technical Information Service (NTIS)

The rapid introduction of digital mobile communications systems is an important part of the emerging digital communications scene. These developments pose both a potential problem and a challenge. On one hand, these separate market driven developments can...

R. A. Dean A. H. Levesque

1991-01-01

188

Correlations Between Bacterial Ecology and Mobile DNA  

PubMed Central

Several factors can affect the density of mobile DNA in bacterial genomes including rates of exposure to novel gene pools, recombination, and reductive evolution. These traits are difficult to measure across a broad range of bacterial species, but the ecological niches occupied by an organism provide some indication of the relative magnitude of these forces. Here, by analyzing 384 bacterial genomes assigned to three ecological categories (obligate intracellular, facultative intracellular, and extracellular), we address two, related questions: How does the density of mobile DNA vary across the Bacteria? And is there a statistically supported relationship between ecological niche and mobile element gene density? We report three findings. First, the fraction of mobile element genes in bacterial genomes ranges from 0 to 21% and decreases significantly: facultative intracellular > extracellular > obligate intracellular bacteria. Results further show that the obligate intracellular bacteria that host switch have a higher mobile DNA gene density than the obligate intracellular bacteria that are vertically transmitted. Second, while bacteria from the three ecological niches differ in their average mobile DNA contents, the ranges of mobile DNA found in each category overlap a surprising extent, suggesting bacteria with different lifestyles can tolerate similar amounts of mobile DNA. Third, mobile DNA gene densities increase with genome size across the entire dataset, and the significance of this correlation is dependent on the obligate intracellular bacteria. Further, mobile DNA gene densities do not correlate with evolutionary relationships in a 16S rDNA phylogeny. These findings statistically support a compelling link between mobile element evolution and bacterial ecology.

Newton, Irene L. G.

2010-01-01

189

Experience from Mobile Application Service Framework in WIP  

Microsoft Academic Search

As there is a rapid growth of service market and technologies of mobile applications, many kinds of platforms, service, business\\u000a models, devices, and requirements for mobile business service are under consideration. In case of Korea, it has been experienced\\u000a for years in applying mobile application service to the real world. In technical domain, one of the hot issues in development

Shinyoung Lim; Youjin Song

2002-01-01

190

ETM - An Optimized Routing Protocol for Mobile SSM Sources  

Microsoft Academic Search

Mobility is considered a key technology of the next generation Internet and has been standardized within the IETF. Rapidly\\u000a emerging multimedia group applications such as IPTV, MMORPGs and video conferencing increase the demand for mobile group communication,\\u000a but a standard design of mobile multicast is still awaited. The traditional Internet approach of Any Source Multicast (ASM)\\u000a routing remains hesitant to

Thomas C. Schmidt; Matthias Wählisch; Maik Wodarz

2008-01-01

191

Development of a mobile research flight test support capability  

NASA Technical Reports Server (NTRS)

This paper presents the approach taken by the NASA Western Aeronautical Test Range (WATR) of the Ames Research Center to develop and utilize mobile systems to satisfy unique real-time research flight test requirements of research projects such as the advanced fighter technology integration (AFTI)F-16, YAV-8B Harrier, F-18 high-alpha research vehicle (HARV), XV-15, and the UH-60 Black Hawk. The approach taken is cost-effective, staff efficient, technologically current, and provides a safe and effective research flight test environment to support a highly complex set of real-time requirements including the areas of tracking and data acquisition, communications (audio and video) and real-time processing and display, postmission processing, and command uplink. The development of this capability has been in response to the need for rapid deployment at varied site locations with full real-time computations and display capability. This paper will discuss the requirements, implementation and growth plan for mobile systems development within the NASA Western Aeronautical Test Range.

Rhea, Donald C.; Moore, Archie L.

1988-01-01

192

Personalized Intelligent Mobile Learning System for Supporting Effective English Learning  

Microsoft Academic Search

Since English has been an international language, how to enhance English levels of people by useful computer assisted learning forms or tools is a critical issue in non-English speaking countries because it definitely affects the overall competition ability of a country. With the rapid growth of wireless and mobile technologies, the mobile learning has been gradually considered as a novel

Chih-ming Chen; Shih-hsun Hsu

2008-01-01

193

Assemblage, adaptation and apps: Smartphones and mobile gaming  

Microsoft Academic Search

As scholars such as Goggin (2009a) have noted, the rapid uptake of ‘smartphones’ has reshaped the ways in which software developers, users, and academics consider the interrelationship between mobility, culture, technology hardware, and the Internet. In addition, this uptake has added a significant new layer of encrustations around what we might define as ‘standard’ uses of mobile technologies. Once limited

Christian Christensen; Patrick Prax

2012-01-01

194

Mobile Wireless Computing: Solutions and Challenges in Data Management  

Microsoft Academic Search

Mobile computing is a new emerging computing paradigm posing many challenging datamanagement problems. We identify these new challenges and investigate their technical significance.New research problems include management of location dependent data, frequentdisconnections, structuring distributed algorithms for mobile hosts, wireless data broadcasting,and energy efficient data access.1 IntroductionThe rapidly expanding technology of cellular communications, wireless LAN, and satellite...

Tomasz Imielinski; B. r. Badrinath

1993-01-01

195

Mobile agent middleware for sensor networks: an application case study  

Microsoft Academic Search

Agilla is a mobile agent middleware that facilitates the rapid deployment of adaptive applications in wireless sensor networks (WSNs). Agilla allows users to create and inject special programs called mobile agents that coordinate through local tuple spaces, and migrate across the WSN performing application-specific tasks. This fluidity of code and state has the potential to transform a WSN into a

Chien-liang Fok; Gruia-catalin Roman; Chenyang Lu

2005-01-01

196

Going wireless: behavior & practice of new mobile phone users  

Microsoft Academic Search

We report on the results of a study in which 19 new mobile phone users were closely tracked for the first six weeks after service acquisition. Results show that new users tend to rapidly modify their perceptions of social appropriateness around mobile phone use, that actual nature of use frequently differs from what users initially predict, and that comprehension of

Leysia Palen; Marilyn C. Salzman; Ed Youngs

2000-01-01

197

MMM2: mobile media metadata for media sharing  

Microsoft Academic Search

Cameraphones are rapidly becoming a global platform for everyday digital imaging especially for networked sharing of media from mobile devices. However, their constrained user interfaces and the current network and application infrastructure encumber the basic tasks of transferring, finding, and sharing captured media. We have deployed a prototype context-aware cameraphone application for mobile media sharing (MMM2) that aims to overcome

Marc Davis; Nancy A. Van House; Jeffrey Towle; Simon King; Shane Ahern; Carrie Burgener; Dan Perkel; Megan Finn; Vijay Viswanathan; Matthew Rothenberg; Scott Fisher; Nick Reid

2005-01-01

198

Globalization and International Student Mobility: A Network Analysis  

ERIC Educational Resources Information Center

This article analyzes changes to the network of international student mobility in higher education over a 10-year period (1999-2008). International student flows have increased rapidly, exceeding 3 million in 2009, and extensive data on mobility provide unique insight into global educational processes. The analysis is informed by three theoretical…

Shields, Robin

2013-01-01

199

Application of Ecoefficiency factor to mobile phone and scanner  

Microsoft Academic Search

The concept of Eco-efficiency, coupling with the stimulation of services and the effort of environmental load reductions, is beneficial to indicate the state of IT-products, where developments are extremely rapid. This paper shows two comprehensive case studies, mobile phones and scanners, especially focusing on how to quantify the service values. As a result, the service value of the mobile phones

K. Fuse; Y. Horikoshi; T. Kumai; T. Taniguchi

2003-01-01

200

Arabic Sign Language Translation System On Mobile Devices  

Microsoft Academic Search

Summary Sign Language Translation System\\/software that translates text into sign language animations could significantly improve deaf lives especially in communication and accessing information. In the last few years the usages of technology have increased rapidly. One of the most popular technologies is the invention of mobile devices. The most common application is mobile phones for voice transmission, but systems for

Sami M. Halawani

2008-01-01

201

Personalized Intelligent Mobile Learning System for Supporting Effective English Learning  

ERIC Educational Resources Information Center

Since English has been an international language, how to enhance English levels of people by useful computer assisted learning forms or tools is a critical issue in non-English speaking countries because it definitely affects the overall competition ability of a country. With the rapid growth of wireless and mobile technologies, the mobile

Chen, Chih-Ming; Hsu, Shih-Hsun

2008-01-01

202

A Study of Mobile Payment Mode in U-Commerce  

Microsoft Academic Search

Due to the rapid development of information technologies mobile payment is crucial for, but not limited to UC scenarios. This paper introduce four kinds of main mobile payment model and comparative analysis the models. It also describes the existing deficiencies of the models and gives the corresponding countermeasures.

Yan Qiang; Tingjie Lu

2008-01-01

203

An efficient communication strategy for ad-hoc mobile networks  

Microsoft Academic Search

We investigate here the problem of establishing communica- tion in an ad-hoc mobile network, that is, we assume the extreme case of a total absense of any flxed network infrastructure (for example a case of rapid deployment of a set of mobile hosts in an unknown terrain). We propose, in such a case, that a small subset of the deployed

Ioannis Chatzigiannakis; Sotiris E. Nikoletseas; Paul G. Spirakis

2001-01-01

204

Public School Choice and Student Mobility in Metropolitan Phoenix  

Microsoft Academic Search

Arizona's interdistrict open enrollment and charter schools laws allow families to send their children to the public schools of their choice. We assessed how public school choice affected elementary school enrollments in 27 metropolitan Phoenix school districts. Student mobility rates varied widely between districts and by location. The higher mobility rates of small urban districts were driven by the movement

Jeanne M. Powers; Amelia M. Topper; Michael Silver

2012-01-01

205

Engineering human trust in mobile system collaborations  

Microsoft Academic Search

Rapid advances in wireless networking technologies have en- abled mobile devices to be connected anywhere and anytime. While roaming, applications on these devices dynamically discover hosts and services with whom interactions can be started. However, the fear of exposure to risky transactions with potentially unknown entities may seriously hinder col- laboration. To minimise this risk, an engineering approach to the

Licia Capra

2004-01-01

206

Acceptable Download Times in the Mobile Internet  

Microsoft Academic Search

The web is becoming more and more graphical and the average size of pages has been growing during the years. Most users enjoy fast download of heavy pages, and the experience of using the web is highly visual. The mobile Internet, e.g. WAP or i-Mode, provides a considerably more limited environment for Internet usage. Although bigger colour displays are rapidly

Virpi Roto; Anne Kaikkonen

2003-01-01

207

Cellular Canceration Induced by Mobile Phone Radiation  

Microsoft Academic Search

With the rapid development of communication technology, there is a widespread use of mobile telephone, whose effect on human has been getting more and more attention. The electromagnetic wave can penetrate biosystems and interacts with biological tissue at different biological levels. Although many researchers have been studying biological effects of electromagnetic radiation for years, their results are not consistent and

Yang Lei; Wang MingLian; Hao DongMei; Zeng Yi

2010-01-01

208

Card, Internet and mobile payments in Finland  

Microsoft Academic Search

Retail payment methods are in a stage of rapid development. New service providers and technological developments enable new payment services through a variety of channels. Payment solutions are being developed based eg on the Internet and on mobile phones. Presumably, the use of paper-based payment instruments will decrease further in the future thanks to electronification in the retail payment area.

Hanna Jyrkönen; Heli Paunonen

2003-01-01

209

Connectivity Monitoring in Mobile Packet Radio Networks.  

National Technical Information Service (NTIS)

Knowledge of connectivity (i.e., what pairs of nodes can communicate directly) in a data communication network is essential for the efficient and reliable operation of the network. In a packet radio network with mobile nodes, the connectivity varies with ...

M. G. Hluchyj

1979-01-01

210

Mobile Router Technology Development  

NASA Technical Reports Server (NTRS)

Cisco Systems and NASA have been performing joint research on mobile routing technology under a NASA Space Act Agreement. Cisco developed mobile router technology and provided that technology to NASA for applications to aeronautic and space-based missions. NASA has performed stringent performance testing of the mobile router, including the interaction of routing and transport-level protocols. This paper describes mobile routing, the mobile router, and some key configuration parameters. In addition, the paper describes the mobile routing test network and test results documenting the performance of transport protocols in dynamic routing environments.

Ivancic, William D.; Stewart, David H.; Bell, Terry L.; Kachmar, Brian A.; Shell, Dan; Leung, Kent

2002-01-01

211

Gone Mobile? (Mobile Libraries Survey 2010)  

ERIC Educational Resources Information Center

Librarians, like patrons and researchers, are caught between traditional library service models and the promise of evolving information technologies. In recent years, professional conferences have strategically featured programs and presentations geared toward building a mobile agenda and adapting or adopting services to meet new demands of mobile

Thomas, Lisa Carlucci

2010-01-01

212

Mobile Agents and Java Mobile Agents Toolkits  

Microsoft Academic Search

This paper gives an overview of what the mobile agents are, what they should do and how they can be implemented in Java. Why Java? The choice to concentrate on Java is evoked by many existing solutions in Java that handles architectural heterogeneity between communicating machines on the net. It seems to be the best available language for making mobile

Damir Horvat; Dragana Cvetkovi?; Veljko Milutinovi?; Petar Ko?ovi?; Vlada Kova?evi?

2001-01-01

213

Mobile Agents and Java Mobile Agents Toolkits  

Microsoft Academic Search

This paper gives an overview of what mobile agents are, what they should do, and how they can be implemented in Java. Why Java? The choice to concentrate on Java is evoked by many existing solutions in Java that handles architectural heterogeneity between communicating machines on the net. It seems to be the best available language for making mobile agents

Damir Horvat; Dragana Cvetkovic; Veljko M. Milutinovic; P. Kocovic; V. Kovacevic

2000-01-01

214

Tandem mobile robot system  

DOEpatents

A robotic vehicle system for terrain navigation mobility provides a way to climb stairs, cross crevices, and navigate across difficult terrain by coupling two or more mobile robots with a coupling device and controlling the robots cooperatively in tandem.

Buttz, James H. (Albuquerque, NM); Shirey, David L. (Albuquerque, NM); Hayward, David R. (Albuquerque, NM)

2003-01-01

215

Ion mobility sensor system  

DOEpatents

An ion mobility sensor system including an ion mobility spectrometer and a differential mobility spectrometer coupled to the ion mobility spectrometer. The ion mobility spectrometer has a first chamber having first end and a second end extending along a first direction, and a first electrode system that generates a constant electric field parallel to the first direction. The differential mobility spectrometer includes a second chamber having a third end and a fourth end configured such that a fluid may flow in a second direction from the third end to the fourth end, and a second electrode system that generates an asymmetric electric field within an interior of the second chamber. Additionally, the ion mobility spectrometer and the differential mobility spectrometer form an interface region. Also, the first end and the third end are positioned facing one another so that the constant electric field enters the third end and overlaps the fluid flowing in the second direction.

Xu, Jun; Watson, David B.; Whitten, William B.

2013-01-22

216

Intelligent Mobility Laboratory.  

National Technical Information Service (NTIS)

This report documents activities to develop and equip a laboratory for robot mobility research and development. The laboratory includes mobile robots, testing systems, instrumentation, analysis tools, as well as test and analysis procedures. Robot mobilit...

G. Witus

2006-01-01

217

Mobile Internet Protocol Analysis.  

National Technical Information Service (NTIS)

Mobile Internet Protocol (IP) is a proposed standard that builds on the current Internet Protocol by making the fact that a user is mobile transparent to applications and higher level protocols such as Transmission Control Protocol (TCP) and User Datagram...

L. J. Brachfeld

1999-01-01

218

Customizing Mobile Applications.  

National Technical Information Service (NTIS)

The dynamics of mobile systems require applications to intelligently adapt to changes in system configurations and to their environment. The authors describe a workplace in which users interact with a number of stationary and mobile systems through the co...

B. N. Schilit M. M. Theimer B. B. Welch

1993-01-01

219

Service Quality's Impact on Mobile Satisfaction and Intention to Use 3G Service  

Microsoft Academic Search

Third generation of mobile technology (3G), being an instantaneous communication medium, is related to mobile commerce (MC) and this has grown rapidly and spread around the globe. IT researchers often place their focus on users' acceptance and its antecedents. Yet factors that influence satisfaction in MC are rarely seen. Viewing 3G service as a mobile technology, this paper has applied

Yung-ming Li; Yung-shao Yeh

2009-01-01

220

A GUI Crawling-Based Technique for Android Mobile Application Testing  

Microsoft Academic Search

As mobile applications become more complex, specific development tools and frameworks as well as costeffective testing techniques and tools will be essential to assure the development of secure, high-quality mobile applications. This paper addresses the problem of automatic testing of mobile applications developed for the Google Android platform, and presents a technique for rapid crash testing and regression testing of

Domenico Amalfitano; Anna Rita Fasolino; Porfirio Tramontana

2011-01-01

221

GPS-enabled mobiles for learning shortest paths: a pilot study  

Microsoft Academic Search

Recent GPS-enabled mobile phones provide a rich and novel platform for exploring new kinds of educational software. Moreover, powerful high-level programming languages such as Python allow rapid development of learning tools that take advantage of mobile technology. This paper reports on a recent pilot study using mobile phones as situated learning tools. The study focused on expressing Dijkstra's algorithm for

Jason J. Holdsworth; Siu Man Lui

2009-01-01

222

Mobile-IT Education (MIT.EDU): M-Learning Applications for Classroom Settings  

ERIC Educational Resources Information Center

In this paper, we describe the Mobile-IT Education (MIT.EDU) system, which demonstrates the potential of using a distributed mobile device architecture for rapid prototyping of wireless mobile multi-user applications for use in classroom settings. MIT.EDU is a stable, accessible system that combines inexpensive, commodity hardware, a flexible…

Sung, M.; Gips, J.; Eagle, N.; Madan, A.; Caneel, R.; DeVaul, R.; Bonsen, J.; Pentland, A.

2005-01-01

223

Effects of Short-Term Memory and Content Representation Type on Mobile Language Learning  

ERIC Educational Resources Information Center

Due to the rapid advancements in mobile communication and wireless technologies, many researchers and educators have started to believe that these emerging technologies can be leveraged to support formal and informal learning opportunities. Mobile language learning can be effectively implemented by delivering learning content through mobile

Chen, Nian-Shing; Hsieh, Sheng-Wen; Kinshuk

2008-01-01

224

Telecommunications: Exposure and Testing Requirements for Mobile Phones Should Be Reassessed.  

National Technical Information Service (NTIS)

The rapid adoption of mobile phones has occurred amidst controversy over whether the technology poses a risk to human health as a result of long-term exposure to RF energy from mobile phone use. FCC and FDA share regulatory responsibilities for mobile pho...

2012-01-01

225

An encompassing view on markdown pricing strategies: an analysis of the Austrian mobile phone market  

Microsoft Academic Search

Fierce competition and rapid technological progress have considerably reduced the life cycle length for mobile phones in the last decade. Once a new mobile phone is launched, providers on the market under consideration practice a markdown strategy. Profits of the providers are generated mainly via the monthly (base plus variable) fees accruing during contract duration whereas the mobile phones are

Gerald Reiner; Martin Natter

2007-01-01

226

Investigating the Determinants and Age and Gender Differences in the Acceptance of Mobile Learning  

ERIC Educational Resources Information Center

With the proliferation of mobile computing technology, mobile learning (m-learning) will play a vital role in the rapidly growing electronic learning market. M-learning is the delivery of learning to students anytime and anywhere through the use of wireless Internet and mobile devices. However, acceptance of m-learning by individuals is critical…

Wang, Yi-Shun; Wu, Ming-Cheng; Wang, Hsiu-Yuan

2009-01-01

227

An Overview of Mobile Assisted Language Learning: From Content Delivery to Supported Collaboration and Interaction  

ERIC Educational Resources Information Center

Mobile learning is undergoing rapid evolution. While early generations of mobile learning tended to propose activities that were carefully crafted by educators and technologists, learners are increasingly motivated by their personal learning needs, including those arising from greater mobility and frequent travel. At the same time, it is often…

Kukulska-Hulme, Agnes; Shield, Lesley

2008-01-01

228

MOBILE PHONES AND DEVELOPMENT: AN ANALYSIS OF IDRC-SUPPORTED PROJECTS  

Microsoft Academic Search

In the context of the rapid growth of mobile phone penetration in developing countries, mobile telephony is currently considered to be particularly important for development. Yet, until recently, very little systematic evidence was available that shed light on the developmental impacts of mobile telecommunication. The Information and Communication Technology for Development (ICT4D) program of the International Development Research Centre (IDRC),

Ahmed T. Rashid

229

AuthoCast - a mobility-compliant protocol framework for multicast sender authentication  

Microsoft Academic Search

Summary Mobility is considered a key technology of the next generation Internet and has been standardized within the IETF. Rapidly emerging multimedia group applications such as IPTV, massive mutliplayer games (MMORPGs) and video conferencing increase the demand for mobile group communication, but a standard design of mobile multicast is still awaited. The open problem poses significant operational and security challenges

Thomas C. Schmidt; Matthias Wählisch; Olaf Christ; Gabriel Hege

2008-01-01

230

Zhang Neural Network Versus Gradient Neural Network for Online Time-Varying Quadratic Function Minimization  

Microsoft Academic Search

With the proved efficacy on solving linear time-varying matrix or vector equations, Zhang neural network (ZNN) could be generalized\\u000a and developed for the online minimization of time-varying quadratic functions. The minimum of a time-varying quadratic function\\u000a can be reached exactly and rapidly by using Zhang neural network, as compared with conventional gradient-based neural networks\\u000a (GNN). Computer-simulation results substantiate further that

Yunong Zhang; Zhan Li; Chenfu Yi; Ke Chen

2008-01-01

231

Mobile Agent Organizations  

Microsoft Academic Search

Mobile agents are a u seful paradigm - other than a useful t echnology - for the development of complex Internet applications. However, the effective development of mobile agent applications r equires s uitable models and infrastructures. This paper proposes an organizational approach to the high-level design o f mobile agent applications. The idea is to models the Internet as

Giacomo Cabri; Letizia Leonardi; Marco Mamei; Franco Zambonelli

2001-01-01

232

Mobile device security  

Microsoft Academic Search

Because of their small size, memory capability, and the case with which information can be downloaded and removed from a facility, mobile devices pose a risk to organizations when used and transported outside physical boundaries. Mobile devices, including Personal Digital Assistants (PDAs), mobile phones, laptops, and smart phones can expose organizational data if not properly protected. This paper will cover

Benjamin Halpert

2004-01-01

233

Mobile Computing Middleware  

Microsoft Academic Search

Recent advances in wireless networking technologies and the growing success of mobile computing devices, such as laptop computers, third generation mobile phones, personal digital assistants, watches and the like, are enabling new classes of applications that present challeng- ing problems to designers. Mobile devices face temporary loss of network connectivity when they move; they are likely to have scarce resources,

Cecilia Mascolo; Licia Capra; Wolfgang Emmerich

2002-01-01

234

Towards Mobile Cryptography  

Microsoft Academic Search

Mobile code technology has become a driving force for recent advances in distributed systems. The concept of mo- bility of executable code raises major security problems. I n this paper we deal with the protection of mobile code from possibly malicious hosts. We conceptualize on the specific cryptographic problems posed by mobile code. We are able to provide a solution

Tomas Sander; Christian F. Tschudin

1998-01-01

235

Superintendent Vulnerability and Mobility.  

ERIC Educational Resources Information Center

Examined Callahan's vulnerability thesis to determine its ability to explain the mobility of superintendents in Texas between 1985 and 1990. Questionnaire and interview data indicated that, at least in Texas where superintendent mobility reached 50% in that time period, vulnerability did not appear to account for much of superintendent mobility.…

Parker, Phyllis

1996-01-01

236

Mobile Student Information System  

ERIC Educational Resources Information Center

Purpose: A mobile student information system (MSIS) based on mobile computing and context-aware application concepts can provide more user-centric information services to students. The purpose of this paper is to describe a system for providing relevant information to students on a mobile platform. Design/methodology/approach: The research…

Asif, Muhammad; Krogstie, John

2011-01-01

237

Sound mobility models  

Microsoft Academic Search

Simulation has become an indispensable tool in the construction and evaluation of mobile systems. By using mobility models that describe constituent movement, one can explore large systems, producing repeatable results for comparison between alternatives. Unfortunately, the vast majority of mobility models---including all those in which nodal speed and distance or destination are chosen independently---suffer from decay; average speed decreases until

Jungkeun Yoon; Mingyan Liu; Brian Noble

2003-01-01

238

Detecting appropriate replication approach considering client and server parameters in mobile environment  

Microsoft Academic Search

Mobile technology is going to be one of the most useful and practical technologies over 21 century. Mobile devices with integrated databases or caches are so useful for most of applications. This new environment with mobile servers and clients has some special characteristics that vary it from traditional distributed systems. Because of these special properties, protocols which were designed for

Vahideh Baradaran Sorkhabi; Hadi Shahamfar

2010-01-01

239

Simulations of Dynamical Friction Including Spatially-Varying Magnetic Fields  

SciTech Connect

A proposed luminosity upgrade to the Relativistic Heavy Ion Collider (RHIC) includes a novel electron cooling section, which would use {approx}55 MeV electrons to cool fully-ionized 100 GeV/nucleon gold ions. We consider the dynamical friction force exerted on individual ions due to a relevant electron distribution. The electrons may be focussed by a strong solenoid field, with sensitive dependence on errors, or by a wiggler field. In the rest frame of the relativistic co-propagating electron and ion beams, where the friction force can be simulated for nonrelativistic motion and electrostatic fields, the Lorentz transform of these spatially-varying magnetic fields includes strong, rapidly-varying electric fields. Previous friction force simulations for unmagnetized electrons or error-free solenoids used a 4th-order Hermite algorithm, which is not well-suited for the inclusion of strong, rapidly-varying external fields. We present here a new algorithm for friction force simulations, using an exact two-body collision model to accurately resolve close interactions between electron/ion pairs. This field-free binary-collision model is combined with a modified Boris push, using an operator-splitting approach, to include the effects of external fields. The algorithm has been implemented in the VORPAL code and successfully benchmarked.

Bell, G. I.; Bruhwiler, D. L.; Busby, R.; Abell, D. T.; Messmer, P.; Veitzer, S. [Tech-X Corp., Boulder, CO 80303 (United States); Litvinenko, V. N. [Brookhaven National Lab, Upton, NY 11973 (United States); Cary, J. R. [Tech-X Corp., Boulder, CO 80303 (United States); University of Colorado, Boulder, CO 80309 (United States)

2006-03-20

240

Simulations of Dynamical Friction Including Spatially-Varying Magnetic Fields  

NASA Astrophysics Data System (ADS)

A proposed luminosity upgrade to the Relativistic Heavy Ion Collider (RHIC) includes a novel electron cooling section, which would use ~55 MeV electrons to cool fully-ionized 100 GeV/nucleon gold ions. We consider the dynamical friction force exerted on individual ions due to a relevant electron distribution. The electrons may be focussed by a strong solenoid field, with sensitive dependence on errors, or by a wiggler field. In the rest frame of the relativistic co-propagating electron and ion beams, where the friction force can be simulated for nonrelativistic motion and electrostatic fields, the Lorentz transform of these spatially-varying magnetic fields includes strong, rapidly-varying electric fields. Previous friction force simulations for unmagnetized electrons or error-free solenoids used a 4th-order Hermite algorithm, which is not well-suited for the inclusion of strong, rapidly-varying external fields. We present here a new algorithm for friction force simulations, using an exact two-body collision model to accurately resolve close interactions between electron/ion pairs. This field-free binary-collision model is combined with a modified Boris push, using an operator-splitting approach, to include the effects of external fields. The algorithm has been implemented in the VORPAL code and successfully benchmarked.

Bell, G. I.; Bruhwiler, D. L.; Litvinenko, V. N.; Busby, R.; Abell, D. T.; Messmer, P.; Veitzer, S.; Cary, J. R.

2006-03-01

241

A New Method of Viewing Attachment Document of eMail on Various Mobile Devices  

NASA Astrophysics Data System (ADS)

As the computing power of the mobile devices is improving rapidly, many kinds of web services are also available in mobile devices just as Email service. Mobile Mail Service began early, but this service is mostly limited in some specified mobile devices such as Smart Phone. That is a limitation that users have to purchase specified phone to be benefited from Mobile Mail Service. In this paper, it uses DIDL (digital item declaration language) markup type defined in MPEG-21 and MobileGate Server, and solved this problem. DIDL could be converted to other markup types which are displayed by mobile devices. By transforming PC Web Mail contents including attachment document to DIDL markup through MobileGate Server, the Mobile Mail Service could be available for all kinds of mobile devices.

Ko, Heeae; Seo, Changwoo; Lim, Yonghwan

242

Rapid shallow breathing  

MedlinePLUS

Tachypnea; Breathing - rapid and shallow; Fast shallow breathing; Respiratory rate - rapid and shallow ... Shallow, rapid breathing has many possible medical causes, including: Asthma Blood clot in an artery in the lung Choking Chronic obstructive ...

243

Mobile Virtual Private Networking  

NASA Astrophysics Data System (ADS)

Mobile Virtual Private Networking (VPN) solutions based on the Internet Security Protocol (IPSec), Transport Layer Security/Secure Socket Layer (SSL/TLS), Secure Shell (SSH), 3G/GPRS cellular networks, Mobile IP, and the presently experimental Host Identity Protocol (HIP) are described, compared and evaluated. Mobile VPN solutions based on HIP are recommended for future networking because of superior processing efficiency and network capacity demand features. Mobile VPN implementation issues associated with the IP protocol versions IPv4 and IPv6 are also evaluated. Mobile VPN implementation experiences are presented and discussed.

Pulkkis, Göran; Grahn, Kaj; Mårtens, Mathias; Mattsson, Jonny

244

Smartphones Based Mobile Mapping Systems  

NASA Astrophysics Data System (ADS)

The past 20 years have witnessed an explosive growth in the demand for geo-spatial data. This demand has numerous sources and takes many forms; however, the net effect is an ever-increasing thirst for data that is more accurate, has higher density, is produced more rapidly, and is acquired less expensively. For mapping and Geographic Information Systems (GIS) projects, this has been achieved through the major development of Mobile Mapping Systems (MMS). MMS integrate various navigation and remote sensing technologies which allow mapping from moving platforms (e.g. cars, airplanes, boats, etc.) to obtain the 3D coordinates of the points of interest. Such systems obtain accuracies that are suitable for all but the most demanding mapping and engineering applications. However, this accuracy doesn't come cheaply. As a consequence of the platform and navigation and mapping technologies used, even an "inexpensive" system costs well over 200 000 USD. Today's mobile phones are getting ever more sophisticated. Phone makers are determined to reduce the gap between computers and mobile phones. Smartphones, in addition to becoming status symbols, are increasingly being equipped with extended Global Positioning System (GPS) capabilities, Micro Electro Mechanical System (MEMS) inertial sensors, extremely powerful computing power and very high resolution cameras. Using all of these components, smartphones have the potential to replace the traditional land MMS and portable GPS/GIS equipment. This paper introduces an innovative application of smartphones as a very low cost portable MMS for mapping and GIS applications.

Al-Hamad, A.; El-Sheimy, N.

2014-06-01

245

Browsing as the killer app: Explaining the rapid success of Apple's iPhone  

Microsoft Academic Search

Since the mid-1990s, the mobile phone industry has sought widespread adoption of mobile data services, envisioning a new “mobile Internet” with its own complex value network delivered through smartphone terminals. With its iPhone, Apple rapidly gained smartphone market share while spurring widespread adoption of mobile data services in the United States.Here it is argued that the success of the iPhone

Joel West; Michael Mace

2010-01-01

246

A mobile anaesthetic--rapid evacuation from hospital.  

PubMed

The use of the Triservice Anaesthetic Apparatus for the emergency evacuation of an anaesthetised patient from nuclear, biological and chemical (NBC) collective protection in a tented hospital complex in the Gulf is described. Because of its compact size and portability the Triservice Anaesthetic Apparatus may prove to be ideal for use in emergency evacuation. PMID:1744824

Niemiro, L A

1991-10-01

247

Third International Workshop on Ion Mobility Spectrometry  

NASA Technical Reports Server (NTRS)

Basic research in ion mobility spectrometry has given rise to rapid advancement in hardware development and applications. The Third International Workshop on Ion Mobility Spectrometry (IMS) was held October 16-19, 1994, at Johnson Space Center to provide a forum for investigators to present the most recent results of both basic and applied IMS research. Presenters included manufacturers and various users, including military research organizations and drug enforcement agencies. Thirty papers were given in the following five sessions: Fundamental IMS Studies, Instrument Development, Hyphenated IMS Techniques, Applications, and Data Reduction and Signal Processing. Advances in hardware development, software development, and user applications are described.

Cross, John H. (editor)

1995-01-01

248

A Varying-e Brane World Cosmology  

NASA Astrophysics Data System (ADS)

We study a varying electric charge brane world cosmology in the RS2 model obtained from a varying-speed-of-light brane world cosmology by redefining the system of units. We elaborate conditions under which the flatness problem and the cosmological constant problem can be resolved by such cosmological model.

Youm, Donam

249

Novel shock absorber features varying yield strengths  

NASA Technical Reports Server (NTRS)

A shock absorbent webbing of partially drawn synthetic strands is arranged in sections of varying density related to the varying mass of the human body. This is contoured to protect the body at points of contact, when subjected to large acceleration or deceleration forces.

Geier, D. J.

1964-01-01

250

New varying speed of light theories  

Microsoft Academic Search

We review recent work on the possibility of a varying speed of light (VSL). We start by discussing the physical meaning of a varying-c, dispelling the myth that the constancy of c is a matter of logical consistency. We then summarize the main VSL mechanisms proposed so far: hard breaking of Lorentz invariance; bimetric theories (where the speeds of gravity

João Magueijo

2003-01-01

251

Mobile Technology, Crowdsourcing and Peace Mapping: New Theory and Applications for Conflict Management  

Microsoft Academic Search

\\u000a This chapter develops a conceptual framework to highlight how mobile technologies can play a role in preventing, resolving\\u000a and containing conflict. The rapid and worldwide proliferation of mobile phones means that access to mobile communication\\u000a is far higher than access to the Internet. We draw on The Third Side (3S) framework for conflict management to demonstrate\\u000a how mobile technology, crowdsourcing

Jessica Heinzelman; Rachel Brown; Patrick Meier

252

Where did all the Payphones go? Intermediaries, Innovation and Insecurity in the Mobile Phone Industry  

Microsoft Academic Search

Abstract The delivery of payphone services by micro-entrepreneurs using mobile phones has been celebrated widely as one of the more successful and innovative deployments,of ICTs for development (ICT4D). This trend has however been impacted by the rapidly changing nature of the mobile phone industry, and rising levels of personal mobile phone ownership. This paper describes some mobile payphone,systems in Africa

Araba Sey

253

People On The Move: Some Thoughts On Human Dispersal In Relation To Rapid Climatic Change  

NASA Astrophysics Data System (ADS)

It is still generally assumed that the default situation for past humans must have been to be sedentary. That is to say, given a chance people would have settled in one area (with a good supply of resources) and established clearly-defined territories. Such concepts presuppose that much of human existence was conducted in climatic conditions sim- ilar to the relatively stable ones seen in the Holocene. What effects do rapid climatic fluctuations have upon environmental carrying capacity, and thus upon human mobil- ity and exploitation patterns? Such an approach could be called 'non-analogue', as it does not seek to impose [current] Holocene patterns upon the Pleistocene, in the same way that 'non-analogue' animal and plant communities are now routinely described for the same period. If one adopts non-analogue perspectives, perhaps one could also argue that in many cases mobility was the rule and not the exception. Turning the conventional wisdom around, we can ask why people should remain in an area. What are the characteristics of that area which could have encouraged people to become less mobile? I do not argue that all groups were mobile: some cannot have been, and not every member of other groups would have been equally mobile (differentiation on grounds of age and sex). In addition, mobility patterns must also have varied over time, although we should not necessarily expect a discernible linear trend either towards or away from greater mobility, because such behaviour operates within a climatic and environmental framework as well as a socio-economic one. If climate oscillated rapidly, it is feasible to suggest that such fluctuations affected environmental stability and thus carrying capacity. The resource species present and their availability would therefore affect the possibilities for human mobility. When discussing the possibilities for human dispersal into new regions, we essentially have a choice between two competing models: the Wave of Advance (sensu Boserup, Cavalli-Svorza &Ammermann) or Directional dispersal. The former model posits a slow, group-fission-based dispersal across the landscape, driven by 'push' factors such as population pressure. We should not expect resources to be evenly-distributed across the landscape, and thus if one adopts a Wave of Advance interpretation, one would have to consider the possibility of rapid, directional jumps between favoured resource 1 patches, seriously damaging the model's viability. On the other hand, Directional dis- persal models expect more focused movement, with certain ecotones (such as rivers or coasts) being preferred, and are driven more by 'pull' factors which draw people across the landscape relatively rapidly. In the latter model, 'infill' occupation between the initially occupied areas can occur if demanded by socio-economic requirements of the group[s]. This paper will explore all these issues, and discuss how we might identify and test them in the archaeological record, and set them in the climatic context. The effects of climatic factors on past human behaviour have to be qualified or discounted before we can really start to discuss social or 'cultural' explanations. 2

Davies, W.

254

Rapid Deployment UAV  

Microsoft Academic Search

Besides UCAV, present winged or helicopter-style UAVs waste too much time and fuel to takeoff and arrive an unpredicted trouble spot. This study presents two design concepts of rapid deployment UAV: the first is vertical launch surface-based rapid deployment UAV (RDUAV), and the second is air-launched rapid deployment UAV (AL-RDUAV). The proposed rapid deployment UAVs should rapidly reach the destination

Shun-Wen Cheng

2008-01-01

255

Statistical Methods with Varying Coefficient Models  

PubMed Central

The varying coefficient models are very important tool to explore the dynamic pattern in many scientific areas, such as economics, finance, politics, epidemiology, medical science, ecology and so on. They are natural extensions of classical parametric models with good interpretability and are becoming more and more popular in data analysis. Thanks to their flexibility and interpretability, in the past ten years, the varying coefficient models have experienced deep and exciting developments on methodological, theoretical and applied sides. This paper gives a selective overview on the major methodological and theoretical developments on the varying coefficient models.

Fan, Jianqing; Zhang, Wenyang

2008-01-01

256

Mobile Viral Marketing  

Microsoft Academic Search

Gerade in Zeiten zunehmender Reizüberflutung und steigender Reaktanz gegenüber traditionellen Werbeformen gewinnen innovative\\u000a Marketinginstrumente, wie Mobile Viral Marketing, verstärkt an Bedeutung. Ziel des vorliegenden Beitrages ist es, den State\\u000a of the Art des Mobile Viral Marketing zu analysieren. Der Beitrag stellt zunächst Mobile Viral Marketing in Form eines strukturellen\\u000a Beschreibungsmodells unter Verwendung der morphologischen Methode vor. Anschließend werden der Stand

K. Pousttchi; K. Turowski; D. G. Wiedemann

257

Residential Mobility and Migration  

NSDL National Science Digital Library

In this module you will have the opportunity to explore the frequency of different types of residential moves carried out by Americans. You will examine some of the basic determinants of residential mobility by looking at variations in different types of mobility by age, marital status, education, and housing tenure. Finally, you will have an opportunity to test hypotheses, drawn from a popular theoretical perspective, about racial differences in residential mobility.

Crowder, Kyle

2009-02-16

258

A Method for Determining Autoignition Temperatures Resulting from Varying Rapid Rise Rates  

NASA Technical Reports Server (NTRS)

Pyrotechnic and explosive devices are widely used in the aerospace industry to provide reliable, lightweight initiation components in ignition systems, cartridge actuated devices, escape and ejection systems, and many other applications. There are two major mechanisms for initiation of the pyrotechnic powders: heat and shock. Of powders initiated by heat, we have little information on the temperature required for ignition in the normal functioning time (milliseconds) of the device. The known autoignition temperatures obtained from standard tests provide data from days down to minutes with temperatures increasing as heating time decreases. In order to better understand this relationship, and to make computer models, improved data are needed.

Hagopian, Michael; McCardle, Kenneth; McDougle, Stephen; Saulsberry, Regor; Sipes, William

2007-01-01

259

Exploring the mobility of mobile phone users  

NASA Astrophysics Data System (ADS)

Mobile phone datasets allow for the analysis of human behavior on an unprecedented scale. The social network, temporal dynamics and mobile behavior of mobile phone users have often been analyzed independently from each other using mobile phone datasets. In this article, we explore the connections between various features of human behavior extracted from a large mobile phone dataset. Our observations are based on the analysis of communication data of 100,000 anonymized and randomly chosen individuals in a dataset of communications in Portugal. We show that clustering and principal component analysis allow for a significant dimension reduction with limited loss of information. The most important features are related to geographical location. In particular, we observe that most people spend most of their time at only a few locations. With the help of clustering methods, we then robustly identify home and office locations and compare the results with official census data. Finally, we analyze the geographic spread of users’ frequent locations and show that commuting distances can be reasonably well explained by a gravity model.

Csáji, Balázs Cs.; Browet, Arnaud; Traag, V. A.; Delvenne, Jean-Charles; Huens, Etienne; Van Dooren, Paul; Smoreda, Zbigniew; Blondel, Vincent D.

2013-03-01

260

Mobility Anchor Controlled Route Optimization for Network Based Mobility Management  

Microsoft Academic Search

Future Internet Protocol mobile communications systems will implement solutions for network-based mobility management to enable mobility for terminals, which do not support Mobile IP. The Internet Engineering Task Force is specifying a base protocol for network-based mobility, which supports registration, deregistration and handover. Support for optimization will be considered in a subsequent standardization step. This paper proposes a solution to

Julien Abeillé; Marco Liebsch; Telemaco Melia

2007-01-01

261

The Reconfigurable IP Mobility Component: Benchmarking Mobility Protocol Implementations  

Microsoft Academic Search

This paper presents a mobile terminal architecture that can dynamically reconfigure between different mobility management protocols. Our main goal is to design an architecture that minimizes the required changes in its operation. This is achieved through the development of a generic mobility component, a composite entity capable of modeling the analyzed mobility protocols. When reconfiguring to a new mobility protocol

Konstantinos Boukis; N. Georganopoulos; H. Aghvami

2007-01-01

262

Disparity Analysis of Time-Varying Imagery.  

National Technical Information Service (NTIS)

An interactive program (called program DIDA) was developed to perform disparity analysis of time-varying imagery. The program consists of four sections: (1) image operations; (2) interesting point selection; (3) interesting point matching, and (4) image d...

F. D. Cooper

1981-01-01

263

Mobile health systems: a brief overview  

NASA Astrophysics Data System (ADS)

Rapid advances in information technology and telecommunications, and more specifically wireless and mobile communications, and their convergence (telematics) are leading to the emergence of a new type of information infrastructure that has the potential of supporting an array of advanced services for healthcare. The objective of this paper is to provide a snapshot of the applications of mobile technology in healthcare. A brief review of the spectrum of these applications and the potential benefits of these efforts will be presented, followed by success case studies in electronic patient record, emergency telemedicine, teleradiology, and home monitoring. It is anticipated that the progress carried out in these efforts, and the potential benefits of emerging mobile technologies will trigger the development of more applications, thus enabling the offering of a better service to the citizen.

Voskarides, S.; Pattichis, Constantinos S.; Habib Istepanian, Robert S.; Kyriacou, E.; Pattichis, Marios S.; Schizas, C. N.

2002-06-01

264

Reconfigurable mobile manipulation for accident response  

SciTech Connect

The need for a telerobotic vehicle with hazard sensing and integral manipulation capabilities has been identified for use in transportation accidents where nuclear weapons are involved. The Accident Response Mobile Manipulation System (ARMMS) platform has been developed to provide remote dexterous manipulation and hazard sensing for the Accident Response Group (ARG) at Sandia National Laboratories. The ARMMS' mobility platform is a military HMMWV [High Mobility Multipurpose Wheeled Vehicle] that is teleoperated over RF or Fiber Optic communication channels. ARMMS is equipped with two high strength Schilling Titan II manipulators and a suite of hazardous gas and radiation sensors. Recently, a modular telerobotic control architecture call SMART (Sandia Modular Architecture for Robotic and Teleoperation) has been applied to ARMMS. SMART enables input devices and many system behaviors to be rapidly configured in the field for specific mission needs. This paper summarizes current SMART developments applied to ARMMS.

ANDERSON,ROBERT J.; MORSE,WILLIAM D.; SHIREY,DAVID L.; CDEBACA,DANIEL M.; HOFFMAN JR.,JOHN P.; LUCY,WILLIAM E.

2000-06-06

265

Time-Varying Graphs and Dynamic Networks  

Microsoft Academic Search

The past few years have seen intensive research efforts carried out in some\\u000aapparently unrelated areas of dynamic systems - delay-tolerant networks,\\u000aopportunistic-mobility networks, social networks - obtaining closely related\\u000ainsights. Indeed, the concepts discovered in these investigations can be viewed\\u000aas parts of the same conceptual universe; and the formal models proposed so far\\u000ato express some specific concepts

Arnaud Casteigts; Paola Flocchini; Walter Quattrociocchi; Nicola Santoro

2010-01-01

266

Data Management for Mobile Computing  

Microsoft Academic Search

Introductionmobile or nomadic computingwirelessubiquitouspersonalArchitectureStationBaseStationBaseFixedHostMbps to GbpsMobileHostHostMobileWireless LAN cellMobileHost1 MbpsMobileHostFixed Network9 KbpsWireless radio cellBaseHostFixedStationFixedHostFixedHostWireless radio cellE. Pitoura - Summer School on Mobile Computing, Jyvaskyla, 1998 1\\

Evaggelia Pitoura; George Samaras

1998-01-01

267

Mobile satellite broadcast system design  

Microsoft Academic Search

An innovative mobile satellite network that will broadcast data and audio signals (voice and music) to mobiles throughout the contiguous United States through MSAT, a North American mobile satellite system now under construction, is described. Mobiles with suitably equipped radios and small L-band omnidirectional mobile satellite antennas simultaneously receive one data channel and any one of many audio channels. Pages,

Gary K. Noreen

1990-01-01

268

Parallelism in Mobile Agent Network  

Microsoft Academic Search

The paper deals with parallel mobile agents and related performance evaluation framework. A model called mobile agent network is proposed. It includes a multi-agent system consisting of co-operating and communicating mobile agents, a set of processing nodes in which the agents perform services and a network that connects processing nodes and allows agent mobility. Parallelism in mobile agent network is

Vjekoslav Sinkovic; Ignac Lovrek; Mario Kusek

269

Mobile Games Challenges and Opportunities  

Microsoft Academic Search

Mobile games are expected to play significant role in future mobile services by evolving beyond the largely single player titles that currently dominate the market to ones that take advantage expanding mobile phone functionality and the wide demographic of the mobile phone user. However, because of the fragmented nature of the mobile software development market, and the restrictions imposed by

Paul Coulton; Reuben Edwards; William Bamford; Fadi Chehimi; Paul Gilbertson; Omer Rashid

2007-01-01

270

Mobile Learning Anytime, Anywhere  

ERIC Educational Resources Information Center

Some educational institutions are taking the leap to mobile learning (m-learning) by giving out free iPods. For example, Abilene Christian University gave iPods or iPhones to freshman students and developed 15 Web applications specifically for the mobile devices. The iPod is not the only ubiquitous m-learning device. Any technology that connects…

Hlodan, Oksana

2010-01-01

271

Mobile Agents - Smart Messages  

Microsoft Academic Search

Wireless communication with Mobile Computing devices is known to be problematic. It is very different in character from conventional communication over wired networks. Since many distributed applications make assumptions about network characteristics, they may not be used in a hostile mobile environment. We are proposing a new kind of messaging system which incorporates adaptive behaviour into the messages themselves. We

Leon Hurst; Pfidraig Cunningham; Fergal Somers

1997-01-01

272

MOBILE AGENTS AND SECURITY  

Microsoft Academic Search

Mobile agent technology offers a new computing paradigm in which a software agent can suspend its execution on a host computer, transfer itself to another agent-enabled host on the network, and resume execution on the new host. The use of mobile code has a long history dating back to the use of remote job entry systems in the 1960's. Today's

W. A. Jansen

1999-01-01

273

Quicklook Air Mobility Modeling.  

National Technical Information Service (NTIS)

In this research we focused on the mobility system modeled by the AMC mobility planner's calculator (AMPCALC). We developed AMPCALC as a user-friendly tool and allow the user to easily carry out strategic airlift, air refueling and aeromedical evacuation ...

M. Pektas

2002-01-01

274

Types for mobile ambients  

Microsoft Academic Search

Java has demonstrated the utility of type systems for mobile code, and in particular their use and implications for security. Se- curity properties rest on the fact that a well-typed Java program (or the corresponding verified bytecode) cannot cause certain kinds of damage. In this paper we provide a type system for mobile computa- tion, that is, for computation that

Luca Cardelli; Andrew D. Gordon

1999-01-01

275

Intergenerational mobility in Britain  

Microsoft Academic Search

The nature and extent of intergenerational mobility in Britain to what extent there is a correlation between a parent's position in the income distribution and that of his or her children at similar points in the life-cycle is a topic of considerable interest for social scientists and policymakers. In this paper we examine the concept of intergenerational mobility in earnings

Lorraine Dearden; Steve Machin; Howard Reed

1995-01-01

276

Intergenerational Mobility in Britain  

Microsoft Academic Search

The authors use longitudinal data on children and their parents to assess the extent of intergenerational mobility in Britain. Based on data from the National Child Development Survey, a cohort of all individuals born in a week of March 1958, they find that the extent of intergenerational mobility is limited. The authors report a clear intergenerational correlation between fathers and

Lorraine Dearden; Stephen Machin; Howard Reed

1997-01-01

277

Intergenerational Mobility in Britain  

Microsoft Academic Search

In this paper we use longitudinal data on children and their parents to assess the extent of intergenerational mobility in Britain. Based on data from the National Child Development Survey, a cohort of all individuals born in a week of March 1958, we find that the extent of intergenerational mobility is limited. We report an intergenerational correlation of the order

Lorraine Dearden; Stephen Machin; H Reed

1996-01-01

278

Mobile IPv6 Security  

Microsoft Academic Search

This paper presents a case study of security protocol design: authen- tication of binding updates in Mobile IPv6. We go step by step through the threat analysis and show how each threat is addressed in the protocol design. The goal is to solve any new security issues caused by the introduction of mobility without requiring any new security infrastructure.

Tuomas Aura

2002-01-01

279

Mobile Code Security Techniques  

Microsoft Academic Search

This paper presents a survey of existing techniques for achieving mobile code security, as well as a representative sampling of systems which use them. In particular, the problem domain is divided into two portions: protecting hosts from malicious code; and protecting mobile code from malicious hosts. The discussion of the malicious code problem includes a more in-depth study of the

Jonathan Moore

1998-01-01

280

Mobile agent security  

Microsoft Academic Search

The agent paradigm is currently attracting much research. A mobile agent is a particular type of agent with the ability to migrate from one host to another where it can resume its execution. In this article we consider security issues that need to be addressed before multi-agent systems in general, and mobile agents in particular, can be a viable solution

Niklas Borselius

2002-01-01

281

Mobility in collaboration  

Microsoft Academic Search

Is paper addresses an issue that has received fitie attention witiln CSCW - the requirements to suppoti mobifity within collaborative activities. By examining three quite different settings each with differing technologicsd suppo~ we examine tie ways in which mobility is critical to collaborative work. We suggest that t=lng mobility seriously may not only contribute our understanding of current support for

Paul Luff; Christian Heath

1998-01-01

282

Robotics vehicle mobility study  

NASA Astrophysics Data System (ADS)

A nine-month study was conducted under the direction of Tank-Automotive Research, Development and Engineering Center (TARDEC) in Warren, MI. to determine the best platform design for inherent all-terrain mobility of an unmanned robotic vehicle in the 15000-2500 lb. range. Reference platforms were the DEMO III 4x4 and the Utah State University 6x6 with omni-directional wheels. The study systematically developed desired top- down design-driving capabilities, operational needs, and mobility concepts supported by extensive analysis using the NATO Reference Mobility Model and literature searches. Maximizing mobility over all terrain and resisting immobilization were emphasized in order to minimize sensor computational burdens while maximizing the probability of timely mission accomplishment. Several wheeled, tracked and hybrid platform concepts were evaluated. Significant improvements in cross- country mobility, obstacle negotiation and self-extraction capability were achieved with hybrid solutions. Final concept development focused on an 8x8 swiveling wheeled platform with band track overlays. Conclusions of the study were: a technology demonstrator platform should be built for mobility validation and NRMM II refinemment; a robotic- vehicle-specific NRMM II mobility scenario should be developed; and sensor solutions for unmanned mobility platforms should be revisited.

Ansorge, Kurt H.; Pond, James E.

2000-07-01

283

Embodied mobile agents  

Microsoft Academic Search

The move in many societies toward individuals having multiple networked computational devices - workstations, notebooks computers, mobile phones, PDAs - radically changes the ways in which people engage those devices. However, we lack interaction paradigms that enable a coherent experience across these technologies. One possible approach to this problem involves the use of embodied mobile agents (EMAs), that is, graphically

Bill Tomlinson; Man Lok Yau; Eric Baumer

2006-01-01

284

Mobile Christian - shuttle flight  

NASA Technical Reports Server (NTRS)

Erin Whittle, 14, (seated) and Brianna Johnson, 14, look on as Louis Stork, 13, attempts a simulated landing of a space shuttle at StenniSphere. The young people were part of a group from Mobile Christian School in Mobile, Ala., that visited StenniSphere on April 21.

2009-01-01

285

TIMED Spacecraft Mobile  

NSDL National Science Digital Library

This is a mobile for students to assemble, aimed at enhancing their knowledge of NASA spacecraft and scientific facts Each element of the mobile contains an image and one fact or scientific concept. The cover contains background information about NASA-s TIMED mission, and two language arts exercises to reinforce space science vocabulary.

2001-06-01

286

Accessible Transportation and Mobility  

Microsoft Academic Search

Accessible transportation is the passport to independent living for everyone. Mobility means having transport services going where and when one wants to travel; being informed about the services; knowing how to use them; being able to use them; and having the means to pay for them. For people with mobility, sensory, or cognitive impairments—many of whom are elderly—such a goal

S. LING SUEN; C. G. B. MITCHELL

287

Mobile marketing to millennials  

Microsoft Academic Search

Discusses the relevance of mobile phone technology in marketing to young consumers aged between 18 and 22; these are the millennials who are heavy mobile phone users and often the architects of change in US culture. Shows how permission is vital in connecting with these consumers interactively: they do not hate all advertising, but they hate “spim”, which is receiving,

Mitch McCasland

2005-01-01

288

Mobile Apps Style Guide  

Cancer.gov

National Cancer Instit?te U.S. DEPARTMENT OF HEALTH AND HUMAN SERVICES National Instit?tes of Health NCI Mobile Apps St?le Guide Version 1.0 Table of Contents 2 01. Mobile 01.1 Branding: Iconograph? 01.2 Branding: Logo Usage 01.3 Branding: Backgrounds 01.4

289

Mobile application pricing  

Microsoft Academic Search

â–º Mobile app markets have become established with contractual restrictions. â–º When mobile platforms are a durable good, equilibrium price is zero. â–º Platforms earn profits from a share of app revenues. â–º To improve profits, platforms act to constrain app pricing. â–º Mechanisms include most favored customer clauses.

Joshua S. Gans

2012-01-01

290

Mobile Apps for Librarians  

ERIC Educational Resources Information Center

In an increasing mobile environment, library and reading-related activities often take place on a phone or tablet device. Not only does this mean that library Web sites must keep mobile navigability in mind, but also develop and utilize apps that allow patrons to interact with information and with libraries. While apps do not serve every purpose,…

Power, June L.

2013-01-01

291

Mobility control agent  

SciTech Connect

Polymer mobility control agents useful in supplemental oil recovery processes, which give improved reciprocal relative mobilities, are prepared by initiating the polymerization of a monomer containing a vinyl group with a catalyst comprising a persulfate and ferrous ammonium sulfate. The vinyl monomer is an acrylyl, a vinyl cyanide, a styryl and water soluble salts thereof.

Argabright, P.A.; Phillips, B.L.; Rhudy, J.S.

1983-05-17

292

Mobile Agent Security  

Microsoft Academic Search

Mobile agent technology is a new paradigm of distributed computing that can replace the conventional client-server model. However, it has not become popular due to some problems such as security. Threats to mobile agent security generally fall into three main classes: disclosure of information, denial of service, and corruption of information. Four threat categories are identified: threats stemming from an

Levent Ertaul; Jayalalitha Panda

2006-01-01

293

Client Mobile Software Design Principles for Mobile Learning Systems  

Microsoft Academic Search

Abstract—In a client-server mobile learning system, client mobile software must run on the mobile phone to acquire, package, and send student’s interaction data via the mobile communications network to the ,connected mobile application server. The server will receive and process the client data in order to offer appropriate content and learning activities. To develop the mobile learning systems there are

Qing Tan; Kinshuk Kinshuk

2009-01-01

294

Rapid Prototyping System.  

National Technical Information Service (NTIS)

Rapid prototyping is pursued as a means to develop and validate functional specifications prior to extensive code development in a large system. This report details and analyzes a strategy for rapid prototyping emphasizing these capabilities (1) a specifi...

T. Welch

1986-01-01

295

Rapid Gastric Emptying  

MedlinePLUS

... INSTITUTES OF HEALTH U.S. Department of Health and Human Services What is rapid gastric emptying? Rapid gastric ... Health of the U.S. Department of Health and Human Services. Established in 1980, the Clearinghouse provides information ...

296

Mutual selection in time-varying networks  

NASA Astrophysics Data System (ADS)

Time-varying networks play an important role in the investigation of the stochastic processes that occur on complex networks. The ability to formulate the development of the network topology on the same time scale as the evolution of the random process is important for a variety of applications, including the spreading of diseases. Past contributions have investigated random processes on time-varying networks with a purely random attachment mechanism. The possibility of extending these findings towards a time-varying network that is driven by mutual attractiveness is explored in this paper. Mutual attractiveness models are characterized by a linking function that describes the probability of the existence of an edge, which depends mutually on the attractiveness of the nodes on both ends of that edge. This class of attachment mechanisms has been considered before in the fitness-based complex networks literature but not on time-varying networks. Also, the impact of mutual selection is investigated alongside opinion formation and epidemic outbreaks. We find closed-form solutions for the quantities of interest using a factorizable linking function. The voter model exhibits an unanticipated behavior as the network never reaches consensus in the case of mutual selection but stays forever in its initial macroscopic configuration, which is a further piece of evidence that time-varying networks differ markedly from their static counterpart with respect to random processes that take place on them. We also find that epidemic outbreaks are accelerated by uncorrelated mutual selection compared to previously considered random attachment.

Hoppe, K.; Rodgers, G. J.

2013-10-01

297

Skylab mobile laboratory  

NASA Technical Reports Server (NTRS)

The Skylab mobile laboratory was designed to provide the capability to obtain necessary data on the Skylab crewmen 30 days before lift-off, within 1 hour after recovery, and until preflight physiological baselines were reattained. The mobile laboratory complex consisted of six laboratories that supported cardiovascular, metabolic, nutrition and endocrinology, operational medicine, blood, and microbiology experiments; a utility package; and two shipping containers. The objectives and equipment requirements of the Skylab mobile laboratory and the data acquisition systems are discussed along with processes such as permanently mounting equipment in the individual laboratories and methods of testing and transporting the units. The operational performance, in terms of amounts of data collected, and the concept of mobile laboratories for medical and scientific experiments are evaluated. The Skylab mobile laboratory succeeded in facilitating the data collection and sample preservation associated with the three Skylab manned flights.

Primeaux, G. R.; Larue, M. A.

1975-01-01

298

Rapid prototyping for neuroscience and neural engineering  

Microsoft Academic Search

Rapid prototyping (RP) is a useful method for designing and fabricating a wide variety of devices used for neuroscience research. The present study confirms the utility of using fused deposition modeling, a specific form of RP, to produce three devices commonly used for basic science experimentation. The accuracy and precision of the RP method varies according to the type and

Peter Tek; Terry C. Chiganos; Javeed Shaikh Mohammed; David T. Eddington; Christopher P. Fall; Peter Ifft; Patrick J. Rousche

2008-01-01

299

Route optimization solution for nested mobile network in local mobility domain with multiple local mobility anchors  

Microsoft Academic Search

NEMO basic support protocol enables mobile networks preserve communication with other nodes, while changing their point of attachment to the Internet. But in nested mobile network, Pinball routing problem appears. In this paper, a route optimization solution for mobile networks based on local mobility management framework was proposed to improve the performance. By defining the operation on local mobility anchor,

Lu Li-hua; Ma Xiao-lei; Liu Yuan-an

2007-01-01

300

Mobility Environmental Research Study Mobility Testing Procedures.  

National Technical Information Service (NTIS)

Test procedures to be used for the evaluation of off-road vehicle mobility performance are presented. The development of a quantitative evaluation system represents an important step in the design of proper off-road vehicle tests. The procedures are prese...

R. A. Liston T. Czako P. Haley W. L. Harrison B. Hanamoto

1966-01-01

301

Mobile Perspectives: On Teaching Mobile Literacy  

ERIC Educational Resources Information Center

While recognizing that digital access is not evenly distributed in the United States, which is to say nothing of the global distribution, one can safely say that this transformation is already here; people are already at the moment in which the ability to use social media, and particularly social media as amplified through the power of the mobile

Parry, David

2011-01-01

302

Mobility of photosynthetic proteins.  

PubMed

The mobility of photosynthetic proteins represents an important factor that affects light-energy conversion in photosynthesis. The specific feature of photosynthetic proteins mobility can be currently measured in vivo using advanced microscopic methods, such as fluorescence recovery after photobleaching which allows the direct observation of photosynthetic proteins mobility on a single cell level. The heterogeneous organization of thylakoid membrane proteins results in heterogeneity in protein mobility. The thylakoid membrane contains both, protein-crowded compartments with immobile proteins and fluid areas (less crowded by proteins), allowing restricted diffusion of proteins. This heterogeneity represents an optimal balance as protein crowding is necessary for efficient light-energy conversion, and protein mobility plays an important role in the regulation of photosynthesis. The mobility is required for an optimal light-harvesting process (e.g., during state transitions), and also for transport of proteins during their synthesis or repair. Protein crowding is then a key limiting factor of thylakoid membrane protein mobility; the less thylakoid membranes are crowded by proteins, the higher protein mobility is observed. Mobility of photosynthetic proteins outside the thylakoid membrane (lumen and stroma/cytosol) is less understood. Cyanobacterial phycobilisomes attached to the stromal side of the thylakoid can move relatively fast. Therefore, it seems that stroma with their active enzymes of the Calvin-Benson cycle, are a more fluid compartment in comparison to the rather rigid thylakoid lumen. In conclusion, photosynthetic protein diffusion is generally slower in comparison to similarly sized proteins from other eukaryotic membranes or organelles. Mobility of photosynthetic proteins resembles restricted protein diffusion in bacteria, and has been rationalized by high protein crowding similar to that of thylakoids. PMID:23955784

Ka?a, Radek

2013-10-01

303

Audio-Visual Multimedia Retrieval on Mobile Devices  

Microsoft Academic Search

Rapidly increasing digital media technologies and compression standards combined with today’s multimedia mobile devices and\\u000a the Internet have led to the widespread exchange of multimedia contents. This, however, brings the problem of handling and\\u000a accessibility of such a massive digital media from a variety of devices (hand held phones to personal computers). Mobile devices\\u000a are not only limited in size,

Iftikhar Ahmad; Moncef Gabbouj

304

Mobile Health (mHealth) biomedical imaging paradigm.  

PubMed

Technology assisted methods for medical diagnosis and biomedical health monitoring are rapidly shifting from classical invasive methods to handheld-based non-invasive approaches. Biomedical imagining is one of the most prominent practices of non-invasive mechanisms in medical applications. This paper considers the medical imaging schemes for Mobile Health (mHealth) applications and studies the feasibility of future mobile systems for accommodating image informatics capabilities. PMID:24111219

Adibi, Sasan

2013-01-01

305

Map matching of mobile probes based on handover location technology  

Microsoft Academic Search

With the rapid development of wireless location technologies, mobile terminals as probes have been regarded as a feasible and low cost method for real-time and wide-area city traffic information collection. If mobile probes deployed in the suburban areas, it will be a feasible supplementary way of real-time traffic information collection in China. This paper tries to investigate map matching problem

Yueming Yuan; Wei Guan; Wei Qiu

2010-01-01

306

Effect modification by time-varying covariates.  

PubMed

Marginal structural models (MSMs) allow estimation of effect modification by baseline covariates, but they are less useful for estimating effect modification by evolving time-varying covariates. Rather, structural nested models (SNMs) were specifically designed to estimate effect modification by time-varying covariates. In their paper, Petersen et al. (Am J Epidemiol 2007;166:985-993) describe history-adjusted MSMs as a generalized form of MSM and argue that history-adjusted MSMs allow a researcher to easily estimate effect modification by time-varying covariates. However, history-adjusted MSMs can result in logically incompatible parameter estimates and hence in contradictory substantive conclusions. Here the authors propose a more restrictive definition of history-adjusted MSMs than the one provided by Petersen et al. and compare the advantages and disadvantages of using history-adjusted MSMs, as opposed to SNMs, to examine effect modification by time-dependent covariates. PMID:17875581

Robins, James M; Hernán, Miguel A; Rotnitzky, Andrea

2007-11-01

307

Ion mobility analysis of lipoproteins  

DOEpatents

A medical diagnostic method and instrumentation system for analyzing noncovalently bonded agglomerated biological particles is described. The method and system comprises: a method of preparation for the biological particles; an electrospray generator; an alpha particle radiation source; a differential mobility analyzer; a particle counter; and data acquisition and analysis means. The medical device is useful for the assessment of human diseases, such as cardiac disease risk and hyperlipidemia, by rapid quantitative analysis of lipoprotein fraction densities. Initially, purification procedures are described to reduce an initial blood sample to an analytical input to the instrument. The measured sizes from the analytical sample are correlated with densities, resulting in a spectrum of lipoprotein densities. The lipoprotein density distribution can then be used to characterize cardiac and other lipid-related health risks.

Benner, W. Henry (Danville, CA); Krauss, Ronald M. (Berkeley, CA); Blanche, Patricia J. (Berkeley, CA)

2007-08-21

308

Mobile computing in critical care.  

PubMed

Handheld computing devices are increasingly used by health care workers, and offer a mobile platform for point-of-care information access. Improved technology, with larger memory capacity, higher screen resolution, faster processors, and wireless connectivity has broadened the potential roles for these devices in critical care. In addition to the personal information management functions, handheld computers have been used to access reference information, management guidelines and pharmacopoeias as well as to track the educational experience of trainees. They can act as an interface with a clinical information system, providing rapid access to patient information. Despite their popularity, these devices have limitations related to their small size, and acceptance by physicians has not been uniform. In the critical care environment, the risk of transmitting microorganisms by such a portable device should always be considered. PMID:17371745

Lapinsky, Stephen E

2007-03-01

309

Quantitative imaging with a mobile phone microscope.  

PubMed

Use of optical imaging for medical and scientific applications requires accurate quantification of features such as object size, color, and brightness. High pixel density cameras available on modern mobile phones have made photography simple and convenient for consumer applications; however, the camera hardware and software that enables this simplicity can present a barrier to accurate quantification of image data. This issue is exacerbated by automated settings, proprietary image processing algorithms, rapid phone evolution, and the diversity of manufacturers. If mobile phone cameras are to live up to their potential to increase access to healthcare in low-resource settings, limitations of mobile phone-based imaging must be fully understood and addressed with procedures that minimize their effects on image quantification. Here we focus on microscopic optical imaging using a custom mobile phone microscope that is compatible with phones from multiple manufacturers. We demonstrate that quantitative microscopy with micron-scale spatial resolution can be carried out with multiple phones and that image linearity, distortion, and color can be corrected as needed. Using all versions of the iPhone and a selection of Android phones released between 2007 and 2012, we show that phones with greater than 5 MP are capable of nearly diffraction-limited resolution over a broad range of magnifications, including those relevant for single cell imaging. We find that automatic focus, exposure, and color gain standard on mobile phones can degrade image resolution and reduce accuracy of color capture if uncorrected, and we devise procedures to avoid these barriers to quantitative imaging. By accommodating the differences between mobile phone cameras and the scientific cameras, mobile phone microscopes can be reliably used to increase access to quantitative imaging for a variety of medical and scientific applications. PMID:24824072

Skandarajah, Arunan; Reber, Clay D; Switz, Neil A; Fletcher, Daniel A

2014-01-01

310

Quantitative Imaging with a Mobile Phone Microscope  

PubMed Central

Use of optical imaging for medical and scientific applications requires accurate quantification of features such as object size, color, and brightness. High pixel density cameras available on modern mobile phones have made photography simple and convenient for consumer applications; however, the camera hardware and software that enables this simplicity can present a barrier to accurate quantification of image data. This issue is exacerbated by automated settings, proprietary image processing algorithms, rapid phone evolution, and the diversity of manufacturers. If mobile phone cameras are to live up to their potential to increase access to healthcare in low-resource settings, limitations of mobile phone–based imaging must be fully understood and addressed with procedures that minimize their effects on image quantification. Here we focus on microscopic optical imaging using a custom mobile phone microscope that is compatible with phones from multiple manufacturers. We demonstrate that quantitative microscopy with micron-scale spatial resolution can be carried out with multiple phones and that image linearity, distortion, and color can be corrected as needed. Using all versions of the iPhone and a selection of Android phones released between 2007 and 2012, we show that phones with greater than 5 MP are capable of nearly diffraction-limited resolution over a broad range of magnifications, including those relevant for single cell imaging. We find that automatic focus, exposure, and color gain standard on mobile phones can degrade image resolution and reduce accuracy of color capture if uncorrected, and we devise procedures to avoid these barriers to quantitative imaging. By accommodating the differences between mobile phone cameras and the scientific cameras, mobile phone microscopes can be reliably used to increase access to quantitative imaging for a variety of medical and scientific applications.

Skandarajah, Arunan; Reber, Clay D.; Switz, Neil A.; Fletcher, Daniel A.

2014-01-01

311

Seamless Mobility Mechanisms for Micro Mobile MPLS  

NASA Astrophysics Data System (ADS)

Efficient mobility management is one of the most important challenges in mobile networks. Since roaming between wireless cells can cause long handoff latency and high packet loss, it can result in poor quality of services for delay-sensitive applications and for applications requiring reliable transmission. In this paper, we propose a new seamless micro-mobility management framework for Micro Mobile MPLS (called MiM-MPLS) to overcome the packet loss problem while maintaining low handoff latency. In addition, we propose a combination of MiM-MPLS and the existing MFC-Micro Mobile MPLS [3],[4] (called MiM-MFC-MPLS) to further enhance the handoff performance. MiM-MPLS and MiM-MFC-MPLS provide efficient handoff mechanisms through the use of pre-established Label Switched Paths (LSPs), the L2 trigger, and local registration. The handoff mechanisms for (L2 and L3) intra handoffs and for an inter handoff in these frameworks are described in detail. The performance is analyzed in terms of the signaling cost of registration updates, handoff latency, packet loss, buffer size requirement, and delay jitter. Compared to existing handoff frameworks, the results show that the proposed MiM-MPLS and MiM-MFC-MPLS can provide no packet loss while maintaining low signaling cost of registration updates, handoff latency, and delay jitter at the cost of some buffer space. In particular, MiM-MFC-MPLS has the best handoff performance (i.e., the lowest signaling cost of registration updates, handoff latency, and delay jitter) among all the frameworks that we considered at the cost of some buffer space.

Sanguanwongthong, Tubtim; Saengudomlert, Poompat; Tubtiang, Arnon

312

Singularities of varying light speed cosmologies  

NASA Astrophysics Data System (ADS)

We study the possible singularities of isotropic cosmological models that have a varying speed of light as well as a varying gravitational constant. The field equations typically reduce to two dimensional systems which are then analyzed both by dynamical systems techniques in phase space and by applying the method of asymptotic splittings. In the general case we find initially expanding closed models which recollapse to a future singularity and open universes that are eternally expanding towards the future. The precise nature of the singularities is also discussed.

Miritzis, John; Cotsakis, Spiros

2007-05-01

313

Solar mass-varying neutrino oscillations.  

PubMed

We propose that the solar neutrino deficit may be due to oscillations of mass-varying neutrinos (MaVaNs). This scenario elucidates solar neutrino data beautifully while remaining comfortably compatible with atmospheric neutrino and K2K data and with reactor antineutrino data at short and long baselines (from CHOOZ and KamLAND). We find that the survival probability of solar MaVaNs is independent of how the suppression of neutrino mass caused by the acceleron-matter couplings varies with density. Measurements of MeV and lower energy solar neutrinos will provide a rigorous test of the idea. PMID:16384133

Barger, V; Huber, Patrick; Marfatia, Danny

2005-11-18

314

A Reverse AODV Routing Protocol in Ad Hoc Mobile Networks  

Microsoft Academic Search

In mobile ad hoc networks, mobile devices wander autonomously for the use of wireless links and dynamically varying network\\u000a topology. AODV (Ad-hoc on-demand Distance vector routing) is a representative among the most widely studied on-demand ad hoc\\u000a routing protocols. Previous protocols have shown some shortcomings on performance. AODV and most of the on-demand ad hoc routing\\u000a protocols use single route

Chonggun Kim; Elmurod Talipov; Byoungchul Ahn

2006-01-01

315

Drift mobilities in amorphous silicon  

SciTech Connect

The author studied the nonlinear effects of the electric field on the drift mobilities of both electrons and holes in a series of undoped hydrogenated amorphous silicon (a-Si:H) and silicon-germanium alloy specimens. The author measured the transient photocurrents in pin diode structures as a function of electric field and temperature. Time-of-flight and charge collection measurements were conducted from which we concluded that the quantum efficiency for photo-carrier generation varied less than 10% for all specimens in this temperature and electric field range. In all cases transport was dispersive, but no evidence for field-dependence of the dispersion itself was found. The characteristic electric field for the onset of nonlinear electron transport increased with Ge concentration. In a-Si:H the author found a slight evidence for nonlinear transport of holes. The author presents a photocharge transient technique which allowed probing of the drift of electrons in several undoped a-Si:H specimens. The author found a unique feature of the transient photocharge associated with the thermal emission of the trapped electrons, strongly indicating that recombination occurs well after deep-trapping. The temperature dependence of the emission time revealed the mean energy of the trap distribution and the attempt-to-escape frequency associated with this trap. The author analyzed transient photocurrent and time-of-flight measurements in undoped a-Si:H for photocarrier motion both parallel and perpendicular to the thin-film growth axis. The author found a good agreement of the electron drift-mobility measurements and the electron mobility-lifetime product estimates for the two field directions for fifteen specimens. The data exclude an electron transport anisotropy in a-Si:H greater than a factor of two.

Antoniadis, H.

1992-01-01

316

Early mobility activities during continuous renal replacement therapy.  

PubMed

Continuous renal replacement therapy (CRRT) is a therapeutic technique used to support critically ill patients with acute renal failure in intensive care units. CRRT is preferred over hemodialysis for patients who cannot tolerate the rapid fluid and electrolyte shifts associated with hemodialysis because of their tenuous hemodynamic state. Traditionally, such patients have not been candidates for mobilization and have remained on strict bed rest. Mobilization is now being initiated on patients undergoing CRRT in intensive care units. This case study chronicles the successful mobilization of a patient undergoing CRRT. This experience suggests that CRRT patients who are appropriate candidates may be mobilized safely and therefore should not automatically be excluded from mobilization therapies. PMID:24986178

Brownback, Cherylynn A; Fletcher, Patricia; Pierce, Lynelle N B; Klaus, Susan

2014-07-01

317

Mobile Sensing Systems  

PubMed Central

Rich-sensor smart phones have made possible the recent birth of the mobile sensing research area as part of ubiquitous sensing which integrates other areas such as wireless sensor networks and web sensing. There are several types of mobile sensing: individual, participatory, opportunistic, crowd, social, etc. The object of sensing can be people-centered or environment-centered. The sensing domain can be home, urban, vehicular… Currently there are barriers that limit the social acceptance of mobile sensing systems. Examples of social barriers are privacy concerns, restrictive laws in some countries and the absence of economic incentives that might encourage people to participate in a sensing campaign. Several technical barriers are phone energy savings and the variety of sensors and software for their management. Some existing surveys partially tackle the topic of mobile sensing systems. Published papers theoretically or partially solve the above barriers. We complete the above surveys with new works, review the barriers of mobile sensing systems and propose some ideas for efficiently implementing sensing, fusion, learning, security, privacy and energy saving for any type of mobile sensing system, and propose several realistic research challenges. The main objective is to reduce the learning curve in mobile sensing systems where the complexity is very high.

Macias, Elsa; Suarez, Alvaro; Lloret, Jaime

2013-01-01

318

Charge Scattering and Mobility in Atomically Thin Semiconductors  

NASA Astrophysics Data System (ADS)

The electron transport properties of atomically thin semiconductors such as MoS2 have attracted significant recent scrutiny and controversy. In this work, the scattering mechanisms responsible for limiting the mobility of single-layer semiconductors are evaluated. The roles of individual scattering rates are tracked as the two-dimensional electron gas density is varied over orders of magnitude at various temperatures. From a comparative study of the individual scattering mechanisms, we conclude that all current reported values of mobilities in atomically thin transition-metal dichalcogenide semiconductors are limited by ionized impurity scattering. When the charged impurity densities are reduced, remote optical phonon scattering will determine the ceiling of the highest mobilities attainable in these ultrathin materials at room temperature. The intrinsic mobilities will be accessible only in clean suspended layers, as is also the case for graphene. Based on the study, we identify the best choices for surrounding dielectrics that will help attain the highest mobilities.

Ma, Nan; Jena, Debdeep

2014-01-01

319

The Varied Uses of Readability Measurement.  

ERIC Educational Resources Information Center

Readability formulas have varied uses. In education they are used to match children's reading ability to the difficulty level of material, select stories and books for classroom use and for individual students' particular needs, select textbooks and other reading materials, aid educational research, and check reading materials of newly literate…

Fry, Edward

320

Time-varying joint distribution through copulas  

Microsoft Academic Search

This paper deals with the analysis of temporal dependence in multivariate time series. The dependence structure between the marginal series is modelled through the use of copulas which, unlike the correlation matrix, give a complete description of the joint distribution. The param- eters of the copula function vary through time following certain evolution equations depending on their previous values and

M. Concepcion Ausin; Hedibert F. Lopes

2010-01-01

321

High explosive detonations in varying oxygen atmospheres  

Microsoft Academic Search

Small spheres of PBX9404 and TNT were detonted in atmospheres of varying oxygen content to study the magnitude of the effects of oxygen on afterburn of high explosive (HE) detonation products (DPs). Each of the fireballs (FBs) formed by the HEDPs was observed by high-speed cameras and radiometers in the visible and near infrared. It was found that afterburn domintes

F. R. Kovar; K. R. Trigger; L. G. Guymon; J. R. Harvey

1982-01-01

322

Double-smoothing for varying coefficient models  

Microsoft Academic Search

Moderation analyses are widely used in biomedical and psychosocial research to investigate differential treatment effects, with moderators frequently identified through testing the significance of the interaction between the predictor and the potential moderator under strong parametric assumptions. Without imposing any parametric forms on how the moderators may affect the relationship between predictors and responses, varying coefficient models address this fundamental

Wan Tang; Guoxin Zuo; Hua He

2011-01-01

323

Face Recognition Under Varying Illumination Using Gradientfaces  

Microsoft Academic Search

In this correspondence, we propose a novel method to extract illumination insensitive features for face recognition under varying lighting called the gradient faces. Theoretical analysis shows gradient faces is an illumination insensitive measure, and robust to different illumination, including uncontrolled, natural lighting. In addition, gradient faces is derived from the image gradient domain such that it can discover underlying inherent

Taiping Zhang; Yuan Yan Tang; Bin Fang; Zhaowei Shang; Xiaoyu Liu

2009-01-01

324

Relaxation Assessment with Varied Structured Milieu (RELAX).  

ERIC Educational Resources Information Center

Describes Relaxation Assessment with Varied Structured Milieu (RELAX), a clinical program designed to assess the degree to which an individual is able to demonstrate self-control for overall general relaxation. The program is designed for use with the Cassel Biosensors biofeedback equipment. (JAC)

Cassel, Russell N.; Cassel, Susie L.

1983-01-01

325

Time-Varying Dynamic Bayesian Networks  

Microsoft Academic Search

Directed graphical models such as Bayesian networks are a favored formalism for modeling the dependency structures in complex multivariate systems such as those encountered in biology and neural science. When a system is undergo- ing dynamic transformation, temporally rewiring networks are needed for cap- turing the dynamic causal influences between covariates. In this paper, we pro- pose time-varying dynamic Bayesian

Le Song; Mladen Kolar; Eric P. Xing

326

Mutual selection in time-varying networks.  

PubMed

Time-varying networks play an important role in the investigation of the stochastic processes that occur on complex networks. The ability to formulate the development of the network topology on the same time scale as the evolution of the random process is important for a variety of applications, including the spreading of diseases. Past contributions have investigated random processes on time-varying networks with a purely random attachment mechanism. The possibility of extending these findings towards a time-varying network that is driven by mutual attractiveness is explored in this paper. Mutual attractiveness models are characterized by a linking function that describes the probability of the existence of an edge, which depends mutually on the attractiveness of the nodes on both ends of that edge. This class of attachment mechanisms has been considered before in the fitness-based complex networks literature but not on time-varying networks. Also, the impact of mutual selection is investigated alongside opinion formation and epidemic outbreaks. We find closed-form solutions for the quantities of interest using a factorizable linking function. The voter model exhibits an unanticipated behavior as the network never reaches consensus in the case of mutual selection but stays forever in its initial macroscopic configuration, which is a further piece of evidence that time-varying networks differ markedly from their static counterpart with respect to random processes that take place on them. We also find that epidemic outbreaks are accelerated by uncorrelated mutual selection compared to previously considered random attachment. PMID:24229223

Hoppe, K; Rodgers, G J

2013-10-01

327

Mobile Manufacturers Forum  

NSDL National Science Digital Library

This is the home page of the Mobile Manufacturer's Forum, an international association of several leading "radio communications equipment manufacturers." Its purpose is to inform the general public about health policies and standards regarding radio frequency (RF) energy emitted by mobile phones and base stations. There are several documents and press releases that can be accessed on the Web site. One in particular, called the Health Policy Update, outlines the research findings of government agencies and independent organizations. These include recommendations for safe design and use, and assessments of health risks associated with cellular phones and other RF devices. An overview of mobile phone technology is also presented.

1998-01-01

328

Mobile sociology. 2000.  

PubMed

This article seeks to develop a manifesto for a sociology concerned with the diverse mobilities of peoples, objects, images, information, and wastes; and of the complex interdependencies between, and social consequences of, such diverse mobilities. A number of key concepts relevant for such a sociology are elaborated: 'gamekeeping', networks, fluids, scapes, flows, complexity and iteration. The article concludes by suggesting that a 'global civil society' might constitute the social base of a sociology of mobilities as we move into the twenty-first century. PMID:20092503

Urry, John

2010-01-01

329

Probabilistic Tangent Subspace Method for M-QAM Signal Equalization in Time-Varying Multipath Channels  

Microsoft Academic Search

\\u000a A new machine learning method called probabilistic tangent subspace is introduced to improve the performance of the equalization\\u000a for the M-QAM modulation signals in wireless communication systems. Due to the mobility of communicator, wireless communication\\u000a channels are time variant. The uncertainties in the time-varying channel’s coefficients cause the amplitude distortion as\\u000a well as the phase distortion of the M-QAM modulation

Jing Yang; Yunpeng Xu; Hongxing Zou

2005-01-01

330

Human mobility patterns predict divergent epidemic dynamics among cities.  

PubMed

The epidemic dynamics of infectious diseases vary among cities, but it is unclear how this is caused by patterns of infectious contact among individuals. Here, we ask whether systematic differences in human mobility patterns are sufficient to cause inter-city variation in epidemic dynamics for infectious diseases spread by casual contact between hosts. We analyse census data on the mobility patterns of every full-time worker in 48 Canadian cities, finding a power-law relationship between population size and the level of organization in mobility patterns, where in larger cities, a greater fraction of workers travel to work in a few focal locations. Similarly sized cities also vary in the level of organization in their mobility patterns, equivalent on average to the variation expected from a 2.64-fold change in population size. Systematic variation in mobility patterns is sufficient to cause significant differences among cities in infectious disease dynamics-even among cities of the same size-according to an individual-based model of airborne pathogen transmission parametrized with the mobility data. This suggests that differences among cities in host contact patterns are sufficient to drive differences in infectious disease dynamics and provides a framework for testing the effects of host mobility patterns in city-level disease data. PMID:23864593

Dalziel, Benjamin D; Pourbohloul, Babak; Ellner, Stephen P

2013-09-01

331

Mobile Phone Dermatitis in Children and Adults: A Review of the Literature  

PubMed Central

Background: Mobile phones have been reported to cause allergic contact dermatitis (ACD). Methods: A comprehensive online literature review was conducted through the National Library of Medicine (Pubmed MEDLINE) using appropriate medical subject headings and keywords. Results: Thirty-seven cases of mobile phone-related ACD were found. Six studies evaluating allergen release from mobile phones were found. Conclusions: Case reports of mobile phone-associated ACD have risen rapidly in number since 2000. Case reports highlight mobile phone ACD in both pediatric and adult populations in many countries. Metal allergens, notably nickel and chromium, were frequently implicated in mobile phone associated ACD. Nickel release from mobile phones appears to be common and has been reported in both cheap and expensive mobile phones, including phones covered under the EU Nickel Directive.

Richardson, Clare; Hamann, Dathan; Thyssen, Jacob P.

2014-01-01

332

Adolescents' risk perceptions on mobile phones and their base stations, their trust to authorities and incivility in using mobile phones: a cross-sectional survey on 2240 high school students in Izmir, Turkey  

PubMed Central

Background Use of mobile phones has rapidly risen among adolescents despite a lack of scientific certainty on their health risks. Risk perception is an important determinant of behavior, and studies on adolescents’ risk perceptions of mobile phones or base stations are very scarce. This study aims to evaluate high school students’ risk perceptions on mobile phones and base stations, their trust to authorities, their opinions regarding incivility while using mobile phones and to assess associated factors. Methods For this cross-sectional study, 2530 students were chosen with stratified cluster sampling among 20,493 high school students studying in Bornova district of Izmir, Turkey, among whom 2240 (88.5%) participated. Risk perceptions and opinions were questioned with a 5-point Likert scale for 24 statements grouped under four dimensions. The mean responses to the four dimensions were categorized as <3.5 (low) and ?3.5 (high) and the determinants were analyzed with logistic regression. Results Mean risk perception scores for the mobile phone, base station, trust to authority and incivility dimensions were 3.69?±?0.89, 4.34?±?0.78, 3.77?±?0.93, 3.16?±?0.93 and the prevalence of high risk perception was 65.1%, 86.7%, 66.2%, 39.7%, respectively. In the mobile phone dimension; students attending industrial technical high school had lower risk perceptions while female students, lower mothers’ education groups and students not using mobile phones (OR?=?2.82, 95% CI?=?1.80-4.40) had higher risk perceptions. In the base station dimension girls had higher risk perceptions (OR?=?1.68, 95% CI?=?1.20-2.37). Girls and students attending industrial technical high school had significantly lower risk perception however 11-12th grade group perceived the risk higher (OR?=?1.45 95% CI?=?1.15-1.84) in the trust to authority dimension. For the incivility dimension, female students (OR?=?1.44, 95% CI?=?1.14-1.82), illiterate/only literate mothers (OR?=?1.79, 95% CI?=?1.04-2.75) and students not using mobile phones (OR?=?2.50, 95% CI?=?1.62-3.87) perceived higher risk. Conclusions Understanding the effects of these determinants might aid in developing more effective educational interventions to specific subgroups on this topic. As debates on the health consequences of electromagnetic fields continue, it would be cautious to approach this issue with a preventive perspective. Efforts should be made to equalize the varying level of knowledge and to ensure that students are informed accurately.

2013-01-01

333

Extended Mobile IPv6 route optimization in nested mobile networks  

Microsoft Academic Search

Route optimization support in mobile networks is one of the most important concerns in Next Generation Networks (NGNs). NGNs require an efficient route optimization scheme, optimized specially to support nesting of mobile networks. We propose an Extended Mobile IPv6 route optimization (EMIP) scheme to enhance the performance of nested mobile networks. EMIP scheme is based on MIPv6 route optimization and

A. Prakash; R. Verma; R. Tripathi; K. Naik

2009-01-01

334

MMPS: A Versatile Mobile-to-Mobile Payment System  

Microsoft Academic Search

The paper presents an effective mobile-to-mobile payment system. A mobile phone with or without SIM card is enabled as an EMV payment instrument and is linked to a debit or credit account in a bank to pay merchant who has a mobile phone or an online EMV capable terminal. In a single phone, multiple credit or debit accounts from different

Ashutosh Saxena; Manik Lal Das; Anurag Gupta

2005-01-01

335

Mobile Language Study.  

National Technical Information Service (NTIS)

This report results from a contract tasking Swedish Institute of Computer Science AB as follows: Contractor will investigate security issues related to mobile code (dynamically loaded code) which can potentially compromise information system security This...

M. Dam P. Giambiagi

2003-01-01

336

Stabilizing mobile philosophers  

Microsoft Academic Search

We present a self-stabilizing solution to a new version of the dining philosophers problem. We call this problem mobile philosophers problem because the philosophers can move around a logical ring formed out of a dynamic network.

Ajoy Kumar Datta; Maria Gradinariu; Michel Raynal

2005-01-01

337

AUSSAT mobile satellite services  

NASA Technical Reports Server (NTRS)

An overview of AUSSAT's planned mobile satellite system is given. The development program which is being undertaken to achieve the 1992 service date is described. Both business and technical aspects of the development program are addressed.

Nowland, Wayne L.; Wagg, Michael; Simpson, Daniel

1988-01-01

338

AUSSAT Mobile Satellite Services.  

National Technical Information Service (NTIS)

An overview of AUSSAT's planned mobile satellite system is given. The development program which is being undertaken to achieve the 1992 service date is described. Both business and technical aspects of the development program are addressed.

W. L. Nowland M. Wagg D. Simpson

1988-01-01

339

Persuasive Mobile Health Applications  

NASA Astrophysics Data System (ADS)

With many industrialized societies bearing the cost of an increasingly sedentary lifestyle on the health of their populations there is a need to find new ways of encouraging physical activity to promote better health and well being. With the increasing power of mobile phones and the recent emergence of personal heart rate monitors, aimed at dedicated amateur runners, there is now a possibility to develop “Persuasive Mobile Health Applications” to promote well being through the use of real-time physiological data and persuade users to adopt a healthier lifestyle. In this paper we present a novel general health monitoring software for mobile phones called Heart Angel. This software is aimed at helping users monitor, record, as well as improve their fitness level through built-in cardio-respiratory tests, a location tracking application for analyzing heart rate exertion over time and location, and a fun mobile-exergame called Health Defender.

Garcia Wylie, Carlos; Coulton, Paul

340

Mobile Ambient Air Monitor.  

National Technical Information Service (NTIS)

The Mobile Ambient Air Monitor (MAAM) is designed to record ambient levels of carbon monoxide, methane, total hydrocarbons, ozone, sulfur dioxide, nitric oxide, nitrogen dioxide, and total oxides of nitrogen. Wind speed and direction, barometric pressure,...

C. M. Johnson L. H. Faber

1980-01-01

341

Mobile Uninterruptible Power Supply  

NASA Technical Reports Server (NTRS)

Proposed mobile unit provides 20 kVA of uninterruptible power. Used with mobile secondary power-distribution centers to provide power to test equipment with minimal cabling, hazards, and obstacles. Wheeled close to test equipment and system being tested so only short cable connections needed. Quickly moved and set up in new location. Uninterruptible power supply intended for tests which data lost or equipment damaged during even transient power failure.

Mears, Robert L.

1990-01-01

342

Mobile Technologies and Education  

Microsoft Academic Search

\\u000a The objective of this study was to explore new and mobile collaboration technologies and to try to find more effective ways\\u000a for museum visits with mobile technologies. The study was implemented in December 2002 with 20 Finnish high school students.\\u000a The students were participating in alternative art course. All of the students seemed to learn quite easily the technologies\\u000a and

Heikki Haaparanta; Harri Ketamo

2003-01-01

343

REST based mobile applications  

NASA Astrophysics Data System (ADS)

Simplicity is the major advantage of REST based webservices. Whereas SOAP is widespread in complex, security sensitive business-to-business aplications, REST is widely used for mashups and end-user centric applicatons. In that context we give an overview of REST and compare it to SOAP. Furthermore we apply the GeoDrawing application as an example for REST based mobile applications and emphasize on pros and cons for the use of REST in mobile application scenarios.

Rambow, Mark; Preuss, Thomas; Berdux, Jörg; Conrad, Marc

2008-03-01

344

Mobile Christian - shuttle flight  

NASA Technical Reports Server (NTRS)

Louis Stork, 13, and Erin Whittle, 14, look on as Brianna Johnson, 14, conducts a 'test' of a space shuttle main engine in the Test Control Center exhibit in StenniSphere, the visitor center at NASA's John C. Stennis Space Center near Bay St. Louis, Miss. The young people were part of a group from Mobile Christian School in Mobile, Ala., that visited StenniSphere on April 21.

2009-01-01

345

Mobile multiple access study  

NASA Technical Reports Server (NTRS)

Multiple access techniques (FDMA, CDMA, TDMA) for the mobile user and attempts to identify the current best technique are discussed. Traffic loading is considered as well as voice and data modulation and spacecraft and system design. Emphasis is placed on developing mobile terminal cost estimates for the selected design. In addition, design examples are presented for the alternative techniques of multiple access in order to compare with the selected technique.

1977-01-01

346

Spectral Imaging from Uavs Under Varying Illumination Conditions  

NASA Astrophysics Data System (ADS)

Rapidly developing unmanned aerial vehicles (UAV) have provided the remote sensing community with a new rapidly deployable tool for small area monitoring. The progress of small payload UAVs has introduced greater demand for light weight aerial payloads. For applications requiring aerial images, a simple consumer camera provides acceptable data. For applications requiring more detailed spectral information about the surface, a new Fabry-Perot interferometer based spectral imaging technology has been developed. This new technology produces tens of successive images of the scene at different wavelength bands in very short time. These images can be assembled in spectral data cubes with stereoscopic overlaps. On field the weather conditions vary and the UAV operator often has to decide between flight in sub optimal conditions and no flight. Our objective was to investigate methods for quantitative radiometric processing of images taken under varying illumination conditions, thus expanding the range of weather conditions during which successful imaging flights can be made. A new method that is based on insitu measurement of irradiance either in UAV platform or in ground was developed. We tested the methods in a precision agriculture application using realistic data collected in difficult illumination conditions. Internal homogeneity of the original image data (average coefficient of variation in overlapping images) was 0.14-0.18. In the corrected data, the homogeneity was 0.10-0.12 with a correction based on broadband irradiance measured in UAV, 0.07-0.09 with a correction based on spectral irradiance measurement on ground, and 0.05-0.08 with a radiometric block adjustment based on image data. Our results were very promising, indicating that quantitative UAV based remote sensing could be operational in diverse conditions, which is prerequisite for many environmental remote sensing applications.

Hakala, T.; Honkavaara, E.; Saari, H.; Mäkynen, J.; Kaivosoja, J.; Pesonen, L.; Pölönen, I.

2013-08-01

347

Varied line-space gratings and applications  

SciTech Connect

This paper presents a straightforward analytical and numerical method for the design of a specific type of varied line-space grating system. The mathematical development will assume plane or nearly-plane spherical gratings which are illuminated by convergent light, which covers many interesting cases for synchrotron radiation. The gratings discussed will have straight grooves whose spacing varies across the principal plane of the grating. Focal relationships and formulae for the optical grating-pole-to-exist-slit distance and grating radius previously presented by other authors will be derived with a symbolic algebra system. It is intended to provide the optical designer with the tools necessary to design such a system properly. Finally, some possible advantages and disadvantages for application to synchrotron to synchrotron radiation beamlines will be discussed.

McKinney, W.R.

1991-07-15

348

The Thermal Collector With Varied Glass Covers  

NASA Astrophysics Data System (ADS)

The thermal collector with varied glass covers represents an innovation realized in order to build a collector able to reach the desired temperature by collecting the solar radiation from the smallest surface, with the highest efficiency. In the case of the thermal collector with variable cover glasses, the number of the glass plates covering the absorber increases together with the length of the circulation pipe for the working fluid. The thermal collector with varied glass covers compared to the conventional collector better meet user requirements because: for the same temperature increase, has the collecting area smaller; for the same collection area, realizes the highest temperature increase and has the highest efficiency. This works is addressed to researchers in the solar energy and to engineers responsible with air-conditioning systems design or industrial and agricultural products drying.

Luminosu, I.; Pop, N.

2010-08-01

349

Rapid fabrication of microcomponents  

NASA Astrophysics Data System (ADS)

In the macroscopic world different 'rapid'-technologies like Rapid Prototyping, Rapid Manufacturing or Rapid Tooling have been established for a fast prototype or molding tool development. In all cases CAD-data can be transformed in a model or prototype directly using a laser which polymerizes reactive resin layer by layer to a final 3D mold within a short period. In this work the rapid fabrication of micro components made from polymers or composites will be presented. The whole fabrication process is divided into two main steps: Firstly laser assisted micro machining using Nd:YAG and KrF-Excimer laser allows a rapid manufacturing of micro structured cemented carbide or steel mold inserts. Secondly the application of light induced reaction injection molding using reactive monomer/polymer resins gives access to the replication of the previously fabricated mold insert. The total processing period starting from CAD until the modeled micro structured part is less than one week.

Hanemann, Thomas; Hausselt, Juergen H.; Ruprecht, Robert; Skrifvars, M.; Zum Gahr, K.-H.; Pfleging, Wilhelm

2000-04-01

350

Cash management in a randomly varying environment  

Microsoft Academic Search

We study a cash management system, in which the distribution of the cash flow Xn in period n=1,2,… depends on the state In of a randomly varying environment. Sufficient conditions are found for the optimality of a simple transfer rule, generalizing and partially improving the well-known results for the classical case with i.i.d. cash flows. These and further structural results

Karl Hinderer; Karl-Heinz Waldmann

2001-01-01

351

ROC graphs with instance-varying costs  

Microsoft Academic Search

Receiver Operating Characteristics (ROC) graphs are a useful technique for organizing classifiers and visual- izing their performance. ROC graphs have been used in cost-sensitive learning because of the ease with which class skew and error cost information can be applied to them to yield cost-sensitive decisions. However, they have been criticized because of their inability to handle instance-varying costs; that

Tom Fawcett

2006-01-01

352

Dark energy from mass varying neutrinos  

NASA Astrophysics Data System (ADS)

We show that mass varying neutrinos (MaVaNs) can behave as a negative pressure fluid which could be the origin of the cosmic acceleration. We derive a model independent relation between the neutrino mass and the equation of state parameter of the neutrino dark energy, which is applicable for general theories of mass varying particles. The neutrino mass depends on the local neutrino density and the observed neutrino mass can exceed the cosmological bound on a constant neutrino mass. We discuss microscopic realizations of the MaVaN acceleration scenario, which involve a sterile neutrino. We consider naturalness constraints for mass varying particles, and find that both eV cut-offs and eV mass particles are needed to avoid fine-tuning. In microscopic realizations of this scenario with a sterile neutrino, these considerations give the sterile neutrino a maximum mass today of order an eV, which could be detectable at MiniBooNE. Because the sterile neutrino was much heavier at earlier times, constraints from big bang nucleosynthesis on additional states are not problematic. We consider regions of high neutrino density and find that the most likely place today to find neutrino masses which are significantly different from the neutrino masses in our solar system is in a supernova. The possibility of different neutrino mass in different regions of the galaxy and the local group could be significant for Z-burst models of ultra-high energy cosmic rays. We also consider the cosmology of and the constraints on the 'acceleron', the scalar field which is responsible for the varying neutrino mass, and briefly discuss neutrino density dependent variations in other constants, such as the fine structure constant.

Fardon, Rob; Nelson, Ann E.; Weiner, Neal

2004-10-01

353

Mobile multicast with routing optimization for recipient mobility  

Microsoft Academic Search

This paper explores the issues of multicasting for mobile hosts using IETF mobile IP. Mobile IP suggests two approaches for mobile multicasting, namely, remote subscription (MIP-RS) and bi-directional tunneling (MIP-BT). MIP-RS uses a naive join-and-leave policy for mobile hosts and causes serious packet losses while roaming. MIP-BT is free from packet losses due to roaming; however, MIP-BT and its modification

Jiunn-Ru Lai; Wanjiun Liao; Ming-Yu Jiang; Chien-An Ke

2001-01-01

354

Mobile agents for enabling mobile user aware applications  

Microsoft Academic Search

Mobile agents based computing has been propounded as thepossible approach to next generation computing. The approachhas been shown to be effective in different domains,especially in the area of mobile and partially connected computing.We describe the design and implementation detailsof MAGENTA (Mobile AGENT environment for distributedApplications) and the mechanisms it provides forenabling applications supporting mobile users. MAGENTA isa generic mobile agent

Akhil Sahai; Christine Morin

1998-01-01

355

Rapidly Progressive Dementia  

PubMed Central

In contrast with more common dementing conditions that typically develop over years, rapidly progressive dementias can develop subacutely over months, weeks, or even days and be quickly fatal. Because many rapidly progressive dementias are treatable, it is paramount to evaluate and diagnose these patients quickly. This review summarizes recent advances in the understanding of the major categories of RPD and outlines efficient approaches to the diagnosis of the various neurodegenerative, toxic-metabolic, infectious, autoimmune, neoplastic, and other conditions that may progress rapidly.

Geschwind, Michael D.; Shu, Huidy; Haman, Aissa; Sejvar, James J.; Miller, Bruce L.

2009-01-01

356

Sensor networks with mobile agents  

Microsoft Academic Search

Architecture for large scale low power sensor network is proposed. Referred to as sensor networks with mobile agents (SENMA), SENMA exploit node redundancies by introducing mobile agents that communicate opportunistically with a large field of sensors. The addition of mobile agents shifts computationally intensive tasks away from primitive sensors to more powerful mobile agents, which enables energy efficient operations under

Lang Tong; Qing Zhao; Srihari Adireddy

2003-01-01

357

Using Mobile Phones in Education  

Microsoft Academic Search

We present three projects in mobile learning. First, we polled 333 Japanese university students regarding their use of mobile devices. 100% reported owning a mobile phone. 99% send email on their mobile phones, exchanging some 200 email messages each week. 66% email peers about classes; 44% email for studying. In contrast, only 43% email on PCs, exchanging an average of

Patricia Thornton; Chris Houser

2004-01-01

358

SEPARATIONS BASED ON MAGNETOPHORETIC MOBILITY  

Microsoft Academic Search

Magnetophoretic mobility arises from the motion of an electrically neutral body in a viscous medium when exposed to an inhomogenous magnetic field. Conforming to other types of mobility, which generally have the form of a “reciprocal friction coefficient” (such as electrophoretic mobility), we have defined the magnetophoretic mobility, m, as a ratio of a particle–field interaction parameter, ?m, to the

Maciej Zborowski; Lee R. Moore; P. Stephen Williams; Jeffrey J. Chalmers

2002-01-01

359

Study of Mobile Payments System  

Microsoft Academic Search

Mobile payment is the killer application in mobile commerce. We classify the payment methods according to several standards, analyze and point out the merits and drawbacks of each method. To enable future applications and technologies to handle mobile payment, we provide a general layered framework and a new process for mobile payment. The framework is composed of load-bearing layer, network

Xiaolin Zheng; Deren Chen

2003-01-01

360

76 FR 24051 - In the Matter of Certain Electronic Devices, Including Mobile Phones, Mobile Tablets, Portable...  

Federal Register 2010, 2011, 2012, 2013

...Mobile Phones, Mobile Tablets, Portable Music Players, and Computers, and Components...mobile phones, mobile tablets, portable music players, and computers, and components...mobile phones, mobile tablets, portable music players, and computers, and...

2011-04-29

361

Inmarsat and personal mobile satellite services  

NASA Astrophysics Data System (ADS)

Personal communications - mobile satellite services (PC-MSS) hold much promise as a profitable business opportunity for a number of interested operators and manufacturers. What will be their impact on the overall mobile communications landscape, and what role will they play in the drive towards the universal personal communicator? It is the thesis of this paper that PC-MSS can provide one of the critical enabling technologies to allow a more rapid, global assimilation of personal mobile communications. Terrestrial mobile communications are local by definition, both in terms of service reach and regulatory oversight. It is estimated that cellular, and other forms of terrestrial mobile communications, will cover over 50% of the world's population, but only 15% of the land mass area by the year 2000. PC-MSS will allow 'cellular extension' to interested users in the uncovered parts of the world. The market opportunity is established and technical solutions are available. However 'user cooperation' will be required and cross mapping of market needs to the technology solutions is the key to financially viable solutions. The potential political and regulatory hurdles are daunting. Inmarsat, as the existing global MSS partnership, is already introducing PC-MSS products and services in the 1990s. The widespread use of briefcase satphones (Inm-M), laptop-sized data terminals (Inm-C), and pocket satpagers (Inm-paging) will break new ground in reshaping the international regulatory context of mobile communications, and in initiating the optimal public switched network integration necessary for global interconnect. It is suggested that this evolutionary approach, by means of international consensus-building within a global partnership of operators, is an effective and proven method to ensure both a sufficient financial return for investors, and fair and equitable access of these services for all countries and users.

McDougal, Patrick; Barendse, Victor

362

Mobile medical image retrieval  

NASA Astrophysics Data System (ADS)

Images are an integral part of medical practice for diagnosis, treatment planning and teaching. Image retrieval has gained in importance mainly as a research domain over the past 20 years. Both textual and visual retrieval of images are essential. In the process of mobile devices becoming reliable and having a functionality equaling that of formerly desktop clients, mobile computing has gained ground and many applications have been explored. This creates a new field of mobile information search & access and in this context images can play an important role as they often allow understanding complex scenarios much quicker and easier than free text. Mobile information retrieval in general has skyrocketed over the past year with many new applications and tools being developed and all sorts of interfaces being adapted to mobile clients. This article describes constraints of an information retrieval system including visual and textual information retrieval from the medical literature of BioMedCentral and of the RSNA journals Radiology and Radiographics. Solutions for mobile data access with an example on an iPhone in a web-based environment are presented as iPhones are frequently used and the operating system is bound to become the most frequent smartphone operating system in 2011. A web-based scenario was chosen to allow for a use by other smart phone platforms such as Android as well. Constraints of small screens and navigation with touch screens are taken into account in the development of the application. A hybrid choice had to be taken to allow for taking pictures with the cell phone camera and upload them for visual similarity search as most producers of smart phones block this functionality to web applications. Mobile information access and in particular access to images can be surprisingly efficient and effective on smaller screens. Images can be read on screen much faster and relevance of documents can be identified quickly through the use of images contained in the text. Problems with the many, often incompatible mobile platforms were discovered and are listed in the text. Mobile information access is a quickly growing domain and the constraints of mobile access also need to be taken into account for image retrieval. The demonstrated access to the medical literature is most relevant as the medical literature and their images are clearly the largest knowledge source in the medical field.

Duc, Samuel; Depeursinge, Adrien; Eggel, Ivan; Müller, Henning

2011-03-01

363

A Technique for Rapid Estimation of the Charge Distribution of Submicron Aerosols under Atmospheric Conditions  

Microsoft Academic Search

A portable technique is presented for rapid estimation of the charge distribution of submicron aerosols under atmospheric conditions, using two Differential Mobility Analyzer (DMA) systems in parallel. Simultaneous measurement of the aerosol mobility and size distributions are made by using one DMA with a neutralizer and the other without. An estimate of the aerosol charge is obtained by a fitting

Alison J. Buckley; Matthew D. Wright; Denis L. Henshaw

2008-01-01

364

The Use of Light Rail or Light Rapid Transit Systems by Individuals with Severe Visual Impairments.  

ERIC Educational Resources Information Center

This study investigated the relationship between use of light rapid or light rail transit (LRT) systems by persons with severe visual impairments and independence in orientation and mobility. It found that orientation and mobility training on LRT systems would resolve many of the difficulties that users encountered. Modifications to improve…

Svendsen, K.

1994-01-01

365

Experimental Analysis of AODV & DSR over TCP & CBR Connections with Varying Speed and Node Density in VANET  

Microsoft Academic Search

ehicular adhoc network or VANET is special types of adhoc network consists of moving cars referred to as nodes; provide a way to exchange any information between cars without depending on fixed infrastructure. For efficient communication between nodes various routing protocols and mobility models have been proposed based on different scenarios. Due to rapid topology changing and frequent disconnection makes

Bijan Paul; Md. Abu Naser Bikas

2011-01-01

366

Standards for the Mobility Common Operational Picture (M-COP): Elements of Ground Vehicle Maneuver.  

National Technical Information Service (NTIS)

Information needed to support ground mobility decision making is critical to the success of ground operations. The ability to rapidly obtain and process relevant information in a network-centric environment will empower warfare planners. In addition, futu...

B. Q. Gates C. L. Blais J. A. Nagle N. C. Goerger P. W. Richmond

2007-01-01

367

Distribuerad Routing i Mobila Taktiska Radionaet (Distributed Routing in Mobile Tactical Radio Networks).  

National Technical Information Service (NTIS)

In mobile multi-hop wireless networks, the topology can change rapidly. For robustness towards topology changes, traffic management is distributed to all nodes. The routing algorithm chooses the communication path in the network. This report investigates ...

M. Skoeld

1999-01-01

368

Cryogenic, Low-Noise High Electron Mobility Transistor Amplifiers for the Deep Space Network.  

National Technical Information Service (NTIS)

The rapid advances recently achieved by cryogenically cooled high electron mobility transistor (HEMT) low-noise amplifiers (LNA's) in the 1- to 10-GHz range are making them extremely competitive with maser amplifiers. In order to address future spacecraft...

J. J. Bautista

1993-01-01

369

Adapting End Host Congestion Control for Mobility  

NASA Technical Reports Server (NTRS)

Network layer mobility allows transport protocols to maintain connection state, despite changes in a node's physical location and point of network connectivity. However, some congestion-controlled transport protocols are not designed to deal with these rapid and potentially significant path changes. In this paper we demonstrate several distinct problems that mobility-induced path changes can create for TCP performance. Our premise is that mobility events indicate path changes that require re-initialization of congestion control state at both connection end points. We present the application of this idea to TCP in the form of a simple solution (the Lightweight Mobility Detection and Response algorithm, that has been proposed in the IETF), and examine its effectiveness. In general, we find that the deficiencies presented are both relatively easily and painlessly fixed using this solution. We also find that this solution has the counter-intuitive property of being both more friendly to competing traffic, and simultaneously more aggressive in utilizing newly available capacity than unmodified TCP.

Eddy, Wesley M.; Swami, Yogesh P.

2005-01-01

370

New varying speed of light theories  

NASA Astrophysics Data System (ADS)

We review recent work on the possibility of a varying speed of light (VSL). We start by discussing the physical meaning of a varying-c, dispelling the myth that the constancy of c is a matter of logical consistency. We then summarize the main VSL mechanisms proposed so far: hard breaking of Lorentz invariance; bimetric theories (where the speeds of gravity and light are not the same); locally Lorentz invariant VSL theories; theories exhibiting a colour-dependent speed of light; varying-c induced by extra dimensions (e.g. in the brane-world scenario); and field theories where VSL results from vacuum polarization or CPT violation. We show how VSL scenarios may solve the cosmological problems usually tackled by inflation, and also how they may produce a scale-invariant spectrum of Gaussian fluctuations, capable of explaining the WMAP data. We then review the connection between VSL and theories of quantum gravity, showing how 'doubly special' relativity has emerged as a VSL effective model of quantum space-time, with observational implications for ultra-high energy cosmic rays (UHECRs) and gamma ray bursts. Some recent work on the physics of 'black' holes and other compact objects in VSL theories is also described, highlighting phenomena associated with spatial (as opposed to temporal) variations in c. Finally, we describe the observational status of the theory. The evidence is currently slim—redshift dependence in the atomic fine structure, anomalies with UHECRs, and (to a much lesser extent) the acceleration of the universe and the WMAP data. The constraints (e.g. those arising from nucleosynthesis or geological bounds) are tight but not insurmountable. We conclude with the observational predictions of the theory and the prospects for its refutation or vindication.

Magueijo, João

2003-11-01

371

Exploring Employee Perspectives on Information Privacy and Security in the Mobile Environment  

Microsoft Academic Search

Maintaining information privacy and security in the mobile environment, an issue having personal and organizational implications,\\u000a remains a challenge because the context of a mobile device can change rapidly. In response to this, the authors have been\\u000a investigating methods of maintaining the privacy of sensitive information accessed in mobile environments (i.e. potentially\\u000a in public places). This particular study, still in

Peter Tarasewich; Benjamin Ngugi; Mansi Sanghavi

2009-01-01

372

Mobile-IT Education (MIT. EDU): m-learning applications for classroom settings  

Microsoft Academic Search

In this paper, we describe the Mobile-IT Education (MIT.EDU) system, which demonstrates the potential of using a distributed mobile device architecture for rapid prototyping of wireless mobile multi-user applications for use in classroom settings. MIT.EDU is a stable, accessible system that combines inexpensive, commodity hardware, a flexible sensor\\/ peripheral interconnection bus, and a powerful, light-weight distributed sensing, classifica- tion, and

M. Sung; Jonathan Gips; Nathan Eagle; Anmol Madan; Ron Caneel; Richard W. DeVaul; J. Bonsen; Alex Pentland

2005-01-01

373

Self-managing, disconnected processes and mechanisms for mobile e-business  

Microsoft Academic Search

With the tremendous advances in hand-held computing and communication capabilities, rapid proliferation of mobile devices, and decreasing device costs, we are seeing a growth in mobile e-business in various consumer and business markets. In this paper, we present a novel architecture and framework for end-to-end mobile e-business applications such as purchasing, retail point of sales, and order management. The design

Jakka Sairamesh; S. Goh; Ioana Stanoi; Chung-Sheng Li; Sriram Padmanabhan

2002-01-01

374

Enabling mHealth while assuring compliance: reliable and secure information access in a mobile world.  

PubMed

An increasingly mobile clinical workforce rapidly adopting consumer devices to access mobile, cloud-based applications, complemented by the wide range of mobile storage devices and other portable electronics, such as digital cameras, MP3 players, can make it difficult to efficiently assure compliance without impacting user productivity. This article reviewed a number of healthcare use cases and introduced comprehensive concepts and possible automated solutions to meet the requirements of a highly complex infrastructure of devices accessing confidential information. PMID:23039784

Wirth, Axel

2012-01-01

375

Linear Parameter Varying Control for Actuator Failure  

NASA Technical Reports Server (NTRS)

A robust linear parameter varying (LPV) control synthesis is carried out for an HiMAT vehicle subject to loss of control effectiveness. The scheduling parameter is selected to be a function of the estimates of the control effectiveness factors. The estimates are provided on-line by a two-stage Kalman estimator. The inherent conservatism of the LPV design is reducing through the use of a scaling factor on the uncertainty block that represents the estimation errors of the effectiveness factors. Simulations of the controlled system with the on-line estimator show that a superior fault-tolerance can be achieved.

Shin, Jong-Yeob; Wu, N. Eva; Belcastro, Christine; Bushnell, Dennis M. (Technical Monitor)

2002-01-01

376

3D-Printing Spatially Varying BRDFs.  

PubMed

A new method fabricates custom surface reflectance and spatially varying bidirectional reflectance distribution functions (svBRDFs). Researchers optimize a microgeometry for a range of normal distribution functions and simulate the resulting surface's effective reflectance. Using the simulation's results, they reproduce an input svBRDF's appearance by distributing the microgeometry on the printed material's surface. This method lets people print svBRDFs on planar samples with current 3D printing technology, even with a limited set of printing materials. It extends naturally to printing svBRDFs on arbitrary shapes. PMID:24808130

Rouiller, Olivier; Bickel, Bernd; Kautz, Jan; Matusik, Wojciech; Alexa, Marc

2013-01-01

377

Laser lithotripsy retropulsion varies with stone mass  

NASA Astrophysics Data System (ADS)

OBJECTIVES: We tested the hypothesis that retropulsion varies with stone size. METHODS: Stone phantoms of uniform cube dimensions were constructed and irradiated with Ho:YAG energy (0.5 J - 3.5 J). Displacement was measured. RESULTS: At any given pulse energy, retropulsion decreased as stone size increased, p<0.05. At any given stone size, retropulsion increased as pulse energy increased, p<0.05. CONCLUSIONS: A strategy of low pulse energy at high repetition rate is appropriate for ureteral stones. For larger bladder and renal stones, retropulsion is minimal even with high pulse energies. More study is warranted.

Robinson, Michael E.; Teichman, Joel M. H.

378

Kuramoto model with time-varying parameters  

NASA Astrophysics Data System (ADS)

We analyze the Kuramoto model generalized by explicit consideration of deterministically time-varying parameters. The oscillators' natural frequencies and/or couplings are influenced by external forces with constant or distributed strengths. A dynamics of the collective rhythms is observed, consisting of the external system superimposed on the autonomous one, a characteristic feature of many thermodynamically open systems. This deterministic, stable, continuously time-dependent, collective behavior is fully described, and the external impact to the original system is defined in both the adiabatic and the nonadiabatic limits.

Petkoski, Spase; Stefanovska, Aneta

2012-10-01

379

Mobile Pit verification system design based on passive special nuclear material verification in weapons storage facilities  

SciTech Connect

A mobile 'drive by' passive radiation detection system to be applied in special nuclear materials (SNM) storage facilities for validation and compliance purposes has been designed through the use of computational modeling and new radiation detection methods. This project was the result of work over a 1 year period to create optimal design specifications to include creation of 3D models using both Monte Carlo and deterministic codes to characterize the gamma and neutron leakage out each surface of SNM-bearing canisters. Results were compared and agreement was demonstrated between both models. Container leakages were then used to determine the expected reaction rates using transport theory in the detectors when placed at varying distances from the can. A 'typical' background signature was incorporated to determine the minimum signatures versus the probability of detection to evaluate moving source protocols with collimation. This established the criteria for verification of source presence and time gating at a given vehicle speed. New methods for the passive detection of SNM were employed and shown to give reliable identification of age and material for highly enriched uranium (HEU) and weapons grade plutonium (WGPu). The finalized 'Mobile Pit Verification System' (MPVS) design demonstrated that a 'drive-by' detection system, collimated and operating at nominally 2 mph, is capable of rapidly verifying each and every weapon pit stored in regularly spaced, shelved storage containers, using completely passive gamma and neutron signatures for HEU and WGPu. This system is ready for real evaluation to demonstrate passive total material accountability in storage facilities. (authors)

Paul, J. N.; Chin, M. R.; Sjoden, G. E. [Nuclear and Radiological Engineering Program, George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, 770 State St, Atlanta, GA 30332-0745 (United States)] [Nuclear and Radiological Engineering Program, George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, 770 State St, Atlanta, GA 30332-0745 (United States)

2013-07-01

380

Assessment of Renewable Energy Technology and a Case of Sustainable Energy in Mobile Telecommunication Sector  

PubMed Central

The rapid growth of the mobile telecommunication sectors of many emerging countries creates a number of problems such as network congestion and poor service delivery for network operators. This results primarily from the lack of a reliable and cost-effective power solution within such regions. This study presents a comprehensive review of the underlying principles of the renewable energy technology (RET) with the objective of ensuring a reliable and cost-effective energy solution for a sustainable development in the emerging world. The grid-connected hybrid renewable energy system incorporating a power conversion and battery storage unit has been proposed based on the availability, dynamism, and technoeconomic viability of energy resources within the region. The proposed system's performance validation applied a simulation model developed in MATLAB, using a practical load data for different locations with varying climatic conditions in Nigeria. Results indicate that, apart from being environmentally friendly, the increase in the overall energy throughput of about 4?kWh/$ of the proposed system would not only improve the quality of mobile services, by making the operations of GSM base stations more reliable and cost effective, but also better the living standards of the host communities.

Okundamiya, Michael S.; Emagbetere, Joy O.; Ogujor, Emmanuel A.

2014-01-01

381

Introduction and comparison of next-generation mobile wireless technologies  

NASA Astrophysics Data System (ADS)

Mobile networks and services have gone further than voice-only communication services and are rapidly developing towards data-centric services. Emerging mobile data services are expected to see the same explosive growth in demand that Internet and wireless voice services have seen in recent years. To support such a rapid increase in traffic, active users, and advanced multimedia services implied by this growth rate along with the diverse quality of service (QoS) and rate requirements set by these services, mobile operator need to rapidly transition to a simple and cost-effective, flat, all IP-network. This has accelerated the development and deployment of new wireless broadband access technologies including fourth-generation (4G) mobile WiMAX and cellular Long-Term Evolution (LTE). Mobile WiMAX and LTE are two different (but not necessarily competing) technologies that will eventually be used to achieve data speeds of up to 100 Mbps. Speeds that are fast enough to potentially replace wired broadband connections with wireless. This paper introduces both of these next generation technologies and then compares them in the end.

Zaidi, Syed R.; Hussain, Shahab; Ali, M. A.; Sana, Ajaz; Saddawi, Samir; Carranza, Aparicio

2010-01-01

382

On the intermittence of routing paths in vehicle-formed mobile ad hoc networks on highways  

Microsoft Academic Search

An information network built on top of vehicles using IVC (inter-vehicle communications) can be viewed as a type of mobile ad hoc networks (MANET). Due to the high mobility of vehicles, the topology of an IVC network can change rapidly and thus an established routing path can easily break. One reason for path breakage is that a vehicle moves out

S. Y. Wang

2004-01-01

383

A virtual agent based mobile 3D game with mascot capsule Micro3D API  

Microsoft Academic Search

The rapid advancement in memory capability and computing power of mobile phones has made them ideal portable platforms for gaming. As the user expectations for the gaming experience grow, mobile games inevitably move from 2 dimensional to 3 dimensional. In this paper, we explore the use of a popular proprietary 3D engine -- Mascot Capsule V3 for Java enabled handsets

Yu Han; Ding Ling; Lu Xin; Xie Boya

2006-01-01

384

Impact of license fees on the prices of mobile voice service  

Microsoft Academic Search

In response to rapidly growing demand for wireless services, regulatory agencies have introduced license fees to enhance the efficiency of spectrum use. The impact of such fees on the market for mobile services is poorly understood. Under certain conditions, license fees are sunk and thus inconsequential for firm decisions. Given the economic and institutional setup of the mobile markets real

Johannes M. Bauer

2003-01-01

385

The European market for mobile data: evolving value chains and industry structures  

Microsoft Academic Search

Whether Europe will be able to maintain its strong position in mobile telecommunications will depend to a large degree on the transition to the next generation technology. Unlike other countries and regions that have embarked on a more gradual transition model, European policy-makers and industry leaders envision a rapid introduction of the next platform, the Universal Mobile Telecommunications System (UMTS).

Carleen F. Maitland; Johannes M. Bauer; Rudi Westerveld

2002-01-01

386

Reconstruction of Mobile Commerce Value Chain in China: An Empirical Analysis of Industrial M&A  

Microsoft Academic Search

China's mobile service markets are undergoing rapid growth and continuous transformation. Especially facing incoming 3G era, firms in other sector are pushing into this market and altering the value chains. In this study, we try to explain how actors in this market utilize strategy of merges and acquisitions (M&A) to consolidate their place, and how these activities reconstruct the mobile

Lei Nie; Jinlong Zhang; Qingshan Man; Xiaoli Chong

2010-01-01

387

V2 RMC: Vertical Video Retrieval System in Mobile Cloud Computing Environment  

Microsoft Academic Search

With the rapid development of Internet and multimedia technologies, video data has become one of the most important information in the Internet. In this paper, we have implemented a vertical video retrieval system based on mobile cloud network called V2RMC in which key words or a video clip is submitted by a mobile terminal. Three enabling techniques are involved such

Haohong Li; Yi Zhuang

2012-01-01

388

Study on the Development of Mobile Learning Promoted by Cloud Computing  

Microsoft Academic Search

Cloud computing which is regarded as the next revolution of science and technology is the development of distributed processing, parallel computing and grid computing. It is an Internet-based super computing model and is promoting the rapid development of mobile learning for its unique superiority as well. The paper summarizes the characteristics and models of traditional mobile learning, analyzes the features

Jian Li

2010-01-01

389

Mobile Cloud Computing: Resource Discovery, Session Connectivity and Other Open Issues  

Microsoft Academic Search

Abstract:Cloud computing can be considered as a model that provides network access to a shared pool of resources, such as storage and computing power, which can be rapidly provisioned and released with minimal management effort. This paper describes a research activity in the area of mobile cloud computing. It highlights different open issues which are associated with the mobile usage

Markus Schüring; Georgios Karagiannis

2011-01-01

390

Exploring College Students' Attitudes and Self-Efficacy of Mobile Learning  

ERIC Educational Resources Information Center

Previous studies have indicated that computers and the internet play very important roles in students' acceptance and use of new information technology. In recent years, with the rapid development of mobile technology, mobile learning (m-learning) has becoming another popular topic. However, little is known about the students' attitudes and…

Yang, Shih-hsien

2012-01-01

391

Offline web application and quiz synchronization for e-learning activity for mobile browser  

Microsoft Academic Search

Rapid growing of internet applications and users has led the improvement of mobile web browser technology and standards such as HTML5. Recently, HTML5 is turning to be a de facto standard after some of its features has been implemented in major mobile web browsers. Moodle as a web based Learning Management System (LMS) has been popular in academic environment for

Royyana M. Ijtihadie; Yoshifumi Chisaki; Tsuyoshi Usagawa; H. B. Cahyo; Achmad Affandi

2010-01-01

392

Poster: the development of a semantic feature analysis based mobile application for individuals with aphasia  

Microsoft Academic Search

We present a Semantic Feature Analysis based mobile application and paired web application, which have been developed in order to facilitate speech and language therapy with a Person with Aphasia (PWA). The goal of this research is to streamline current speech and language therapy practices, by enabling rapid data entry, aggregation and remote analysis. The mobile application has been developed

Conor Higgins; Áine Kearns; Sue Franklin

2012-01-01

393

Mobile phone location determination and its impact on intelligent transportation systems  

Microsoft Academic Search

Research and development on the technologies of locating the mobile (wireless) phone caller have been rapidly gaining momentum around the world. Once these technologies are mature enough to be deployed, they will have significant impact on automotive telematics and modern public transit systems. In this paper, we will discuss why locating mobile phones becomes a hot topic among telecommunications giants,

Yilin Zhao

2000-01-01

394

Mobile Practices in Everyday Life: Popular Digital Technologies and Schooling Revisited  

ERIC Educational Resources Information Center

Mobile phones have rapidly been absorbed into the fabric of our day-to-day lives. They are now a key consumer item, a symbol of social capital and they connect their users to a mobile web with multiple applications. As ownership and access to smartphones has spread into the teenage years, their place in institutions of formal education has been…

Merchant, Guy

2012-01-01

395

Autonomous mobile communication relays  

NASA Astrophysics Data System (ADS)

Maintaining a solid radio communication link between a mobile robot entering a building and an external base station is a well-recognized problem. Modern digital radios, while affording high bandwidth and Internet-protocol-based automatic routing capabilities, tend to operate on line-of-sight links. The communication link degrades quickly as a robot penetrates deeper into the interior of a building. This project investigates the use of mobile autonomous communication relay nodes to extend the effective range of a mobile robot exploring a complex interior environment. Each relay node is a small mobile slave robot equipped with sonar, ladar, and 802.11b radio repeater. For demonstration purposes, four Pioneer 2-DX robots are used as autonomous mobile relays, with SSC-San Diego's ROBART III acting as the lead robot. The relay robots follow the lead robot into a building and are automatically deployed at various locations to maintain a networked communication link back to the remote operator. With their on-board external sensors, they also act as rearguards to secure areas already explored by the lead robot. As the lead robot advances and RF shortcuts are detected, relay nodes that become unnecessary will be reclaimed and reused, all transparent to the operator. This project takes advantage of recent research results from several DARPA-funded tasks at various institutions in the areas of robotic simulation, ad hoc wireless networking, route planning, and navigation. This paper describes the progress of the first six months of the project.

Nguyen, Hoa G.; Everett, Hobart R.; Manouk, Narek; Verma, Ambrish

2002-07-01

396

Mobile systems capability plan  

SciTech Connect

This plan was prepared to initiate contracting for and deployment of these mobile system services. 102,000 cubic meters of retrievable, contact-handled TRU waste are stored at many sites around the country. Also, an estimated 38,000 cubic meters of TRU waste will be generated in the course of waste inventory workoff and continuing DOE operations. All the defense TRU waste is destined for disposal in WIPP near Carlsbad NM. To ship TRU waste there, sites must first certify that the waste meets WIPP waste acceptance criteria. The waste must be characterized, and if not acceptable, subjected to additional processing, including repackaging. Most sites plan to use existing fixed facilities or open new ones between FY1997-2006 to perform these functions; small-quantity sites lack this capability. An alternative to fixed facilities is the use of mobile systems mounted in trailers or skids, and transported to sites. Mobile systems will be used for all characterization and certification at small sites; large sites can also use them. The Carlsbad Area Office plans to pursue a strategy of privatization of mobile system services, since this offers a number of advantages. To indicate the possible magnitude of the costs of deploying mobile systems, preliminary estimates of equipment, maintenance, and operating costs over a 10-year period were prepared and options for purchase, lease, and privatization through fixed-price contracts considered.

NONE

1996-09-01

397

Rapid solidification of magnetic oxides  

NASA Technical Reports Server (NTRS)

The enhanced control over microstructural evolution inherent in rapid solidification processing techniques are exploited to create novel ceramic magnetic materials. The great sensitivity of magnetic properties to local structure provides a powerful probe both for the study of structure and of microscopic solidification mechanisms. The first system studied is the SrO-Fe2O3 binary, which contains the commercially important hard magnetic compound strontium hexaferrite. The products were analyzed by transmission electron microscopy, Mossbauer spectroscopy, magnetic measurements, and differential thermal analysis. As-quenched ribbons contain high concentrations of super-paramagnetic particles, 80 to 250 Angstroms in diameter, in a glassy matrix. This suggests the possibility of crystallizing monodomain strontium hexaferrite during subsequent heat treatment, with a resulting increase in coercivity over conventionally processed ferrite magnets. That magnetic properties can be controlled in solidification processing by varying the quench rate is demonstrated.

Kalonji, G.; Deguire, M. R.

1985-01-01

398

Optimizing power output by varying repetition tempo.  

PubMed

The effects of varying interrepetition rest and eccentric velocity on power output (PO) and the number of repetitions performed during a bench press set were examined in 24 college-aged resistance trained men. On 6 separate occasions, subjects performed a set of bench press at 80% 1 repetition maximum until volitional fatigue. For each of the 6 repetition tempo trials, the bench press set was paced by metronome to a unique repetition tempo involving a combination of the following: interrepetition rest of 0 or 4 seconds; eccentric velocity of 1 or 4 seconds and bottom rest of 0 or 3 seconds. The velocity of concentric contraction was maximal during all 6 tempo trials. During each trial, video data were captured to determine PO variables and number of successful repetitions completed at each tempo. One-way repeated measures analysis of variance showed tempos with a fast eccentric phase (1 second), and no bottom rest produced significantly greater (p ? 0.05) PO and repetitions than tempos involving slower eccentric velocity (4 seconds) or greater bottom rest (4 seconds). This combination of greater repetitions and PO resulted in a greater volume of work. Varying interrepetition rest (1 or 4 seconds) did not significantly affect PO or repetitions. The results of this study support the use of fast eccentric speed and no bottom rest during acute performance testing to maximize PO and number of repetitions during a set of bench press. PMID:21881531

Pryor, Riana R; Sforzo, Gary A; King, Deborah L

2011-11-01

399

Detecting skin colors under varying illumination  

NASA Astrophysics Data System (ADS)

Skin color has been used as an important cue for various human related computer vision applications. However, detecting skin colors under varying illumination is a challenging task, as the appearance of skin in an image highly depends on the illumination under which the image was taken. To this end, a method for detecting skin colors under varying illumination is proposed in this paper. First, spatial illumination variation is identified and the images are segmented into different regions with different illumination. Each illumination region of color images are corrected base on the illuminant estimated by a local edge-based color constancy algorithm. Then, the corrected images are transformed into a color-space, where statistical results on a skin dataset show that the skin color cluster and non-skin color clusters are separated. Finally, the skin colors are modeled under Bayesian decision framework and classified from non-skin colors. The experimental results show that the proposed method is robust to illumination variations.

Liu, Leyuan; Huang, Rui; Yang, Saiyong; Sang, Nong

2011-11-01

400

Varying prior information in Bayesian inversion  

NASA Astrophysics Data System (ADS)

Bayes' rule is used to combine likelihood and prior probability distributions. The former represents knowledge derived from new data, the latter represents pre-existing knowledge; the Bayesian combination is the so-called posterior distribution, representing the resultant new state of knowledge. While varying the likelihood due to differing data observations is common, there are also situations where the prior distribution must be changed or replaced repeatedly. For example, in mixture density neural network (MDN) inversion, using current methods the neural network employed for inversion needs to be retrained every time prior information changes. We develop a method of prior replacement to vary the prior without re-training the network. Thus the efficiency of MDN inversions can be increased, typically by orders of magnitude when applied to geophysical problems. We demonstrate this for the inversion of seismic attributes in a synthetic subsurface geological reservoir model. We also present results which suggest that prior replacement can be used to control the statistical properties (such as variance) of the final estimate of the posterior in more general (e.g., Monte Carlo based) inverse problem solutions.

Walker, Matthew; Curtis, Andrew

2014-06-01

401

Transient, spatially varied groundwater recharge modeling  

NASA Astrophysics Data System (ADS)

The objective of this work is to integrate field data and modeling tools in producing temporally and spatially varying groundwater recharge in a pilot watershed in North Okanagan, Canada. The recharge modeling is undertaken by using the Richards equation based finite element code (HYDRUS-1D), ArcGIS™, ROSETTA, in situ observations of soil temperature and soil moisture, and a long-term gridded climate data. The public version of HYDUS-1D and another version with detailed freezing and thawing module are first used to simulate soil temperature, snow pack, and soil moisture over a one year experimental period. Statistical analysis of the results show both versions of HYDRUS-1D reproduce observed variables to the same degree. After evaluating model performance using field data and ROSETTA derived soil hydraulic parameters, the HYDRUS-1D code is coupled with ArcGIS™ to produce spatially and temporally varying recharge maps throughout the Deep Creek watershed. Temporal and spatial analysis of 25 years daily recharge results at various representative points across the study watershed reveal significant temporal and spatial variations; average recharge estimated at 77.8 ± 50.8 mm/year. Previous studies in the Okanagan Basin used Hydrologic Evaluation of Landfill Performance without any attempt of model performance evaluation, notwithstanding its inherent limitations. Thus, climate change impact results from this previous study and similar others, such as Jyrkama and Sykes (2007), need to be interpreted with caution.

Assefa, Kibreab Amare; Woodbury, Allan D.

2013-08-01

402

Controlling Contagion Processes in Time Varying Networks  

NASA Astrophysics Data System (ADS)

The vast majority of strategies aimed at controlling contagion and spreading processes on networks consider the connectivity pattern of the system as quenched. In this paper, we consider the class of activity driven networks to analytically evaluate how different control strategies perform in time-varying networks. We consider the limit in which the evolution of the structure of the network and the spreading process are simultaneous yet independent. We analyze three control strategies based on node's activity patterns to decide the removal/immunization of nodes. We find that targeted strategies aimed at the removal of active nodes outperform by orders of magnitude the widely used random strategies. In time-varying networks however any finite time observation of the network dynamics provides only incomplete information on the nodes' activity and does not allow the precise ranking of the most active nodes as needed to implement targeted strategies. Here we develop a control strategy that focuses on targeting the egocentric time-aggregated network of a small control group of nodes.The presented strategy allows the control of spreading processes by removing a fraction of nodes much smaller than the random strategy while at the same time limiting the observation time on the system.

Liu, Suyu; Perra, Nicola; Karsai, Marton; Vespignani, Alessandro

2013-03-01

403

Eulerian indicators under continuously varying conditions  

NASA Astrophysics Data System (ADS)

In this paper, we extend the notion of Eulerian indicators (EIs) for predicting Lagrangian mixing behavior previously developed for blinking flows to the continuous time setting. We apply the EIs to a study of mixing in a kinematic model of a time-dependent double-gyre with five different time dependencies--sinusoidal, sawtooth, square wave, triangular, and noise (which is constructed so that it is also periodic in time). Each of the five velocity fields is described by two parameters; the strength of the time dependence (?) and the period (T). Based on a trajectory based quality of mixing diagnostic (Danckwerts' normalized variance of concentration) we find that noisy time dependence has the largest region of good mixing in the parameter space and triangular time dependence has parameter values corresponding to the most complete and fastest mixing. These Lagrangian based predictions are confirmed by the EIs (product of the transversality and mobility). Although not every feature of the mixing behavior is captured by EIs, we show that they do in general predict the regions in the parameter space under consideration that correspond to good mixing. Moreover, the EIs offer a factor of 100 computational advantage in exploring the parameter space in comparison with the trajectory based mixing diagnostic.

McIlhany, Kevin L.; Wiggins, Stephen

2012-07-01

404

Mobile Modelling for Crowdsourcing Building Interior Data  

NASA Astrophysics Data System (ADS)

Indoor spatial data forms an important foundation to many ubiquitous computing applications. It gives context to users operating location-based applications, provides an important source of documentation of buildings and can be of value to computer systems where an understanding of environment is required. Unlike external geographic spaces, no centralised body or agency is charged with collecting or maintaining such information. Widespread deployment of mobile devices provides a potential tool that would allow rapid model capture and update by a building's users. Here we introduce some of the issues involved in volunteering building interior data and outline a simple mobile tool for capture of indoor models. The nature of indoor data is inherently private; however in-depth analysis of this issue and legal considerations are not discussed in detail here.

Rosser, J.; Morley, J.; Jackson, M.

2012-06-01

405

Analysis of differences of the consumption of mobile voice service based on quantile regression model  

Microsoft Academic Search

This paper researches the demand function of the per capita consumption of mobile voice service by fixed effect quantile regression model. Results show that both price elasticity and income elasticity vary between different consumption-level consumer groups. For low-consumption consumers, income is the most important factor that impacts their consumption, while the price of mobile voice service and the price of

Wang Rong; Tang Xiao-wo; Pan Jing-ming

2010-01-01

406

Tuning the lateral mobility of thin block copolymer films  

NASA Astrophysics Data System (ADS)

Polymer mobility in confined environments is of both theoretical and practical interest. The controlled formation and characterization of systems where such effects can be studied remain active areas of investigation. In this work, we created ultrathin (< 50 nm) supported films of amphiphilic polybutylene-poly(ethylene) oxide diblock copolymers, through Langmuir-Blodgett and Langmuir-Schaefer techniques. To adjust the lateral mobility of these ultrathin films, short polyisobutylene homopolymer was introduced during the film assembly process. Preliminary fluorescence recovery after photobleaching (FRAP) results show that the lateral mobility of the block copolymers is proportional to the logarithm of homopolymer concentration. The mobility can be varied by up to a factor of 8 with as little as 1 mol% of homopolymer. The role of the added homopolymer on the block copolymer lateral mobility is likely to be related with several features such as chain entanglements, interfacial constraints, and interlayer friction. By varying the concentration and the molecular weight of the homopolymer introduced into the films, we attempt to explain the underlying physical mechanisms that are responsible for changes in lateral mobility.

Bermudez, Harry; Kourouklis, Andreas

2013-03-01

407

Hydraulics in oil drilling from offshore mobile platforms  

SciTech Connect

Because of the requirement for rapid operation of subsea safety equipment when drilling from offshore mobile platforms, special hydraulic equipment is required. This paper discusses the features of hydraulic control systems used for operation of subsea blowout preventer equipment from offshore floating drilling rigs. Special features of the hydraulic equipment are discussed along with specific requirements which influence component designs and performance evaluations.

Benson, P.R.

1982-11-01

408

Anonymous and untraceable communications: Location privacy in mobile internetworking  

Microsoft Academic Search

Data protection and privacy is rapidly becoming one of the most important is- sues on the Internet today. Larger number of Internet sites are collecting personal information from users through forms, cookies, online registrations, or surveys than ever before. New commercial services are springing up that can exploit the ability of mobile communication service providers to determine the geographic location

Alberto Escudero Pascual

2001-01-01

409

Trends in Middleware for Mobile Ad Hoc Networks  

Microsoft Academic Search

The use of middleware has extended from simply facilitating applications' communication to a broad set of services supporting a huge spectrum of networked and distributed computing environments. At the same time mobile wireless ad hoc networks (MANET) have become a popular distributed environment and its application domain is expanding rapidly. However, like all distributed environments several issues must be considered

Salem Hadim; Jameela Al-jaroodi; Nader Mohamed

2006-01-01

410

A Mobile Computing Approach to Automatic Traffic Evacuation Management  

Microsoft Academic Search

In this paper we first introduce our smart traffic evacuation management system (STEMS), an ITS system in development to quickly and efficiently generate dynamic evacuation plans facilitating the rapid evacuation of a city street network in response to a human-induced disaster. We then broaden STEMS to a 2-tier architecture designed to interact with mobile devices. When incidents occur, STEMS automatically

Alexander Aved; Ai Hua Ho; Kien A. Hua; Lap T. Hoang; Georgiana L. Hamza-Lup

2006-01-01

411

A review of routing protocols for mobile ad hoc networks  

Microsoft Academic Search

The 1990s have seen a rapid growth of research interests in mobile ad hoc networking. The infrastructureless and the dynamic nature of these networks demands new set of networking strategies to be implemented in order to provide efficient end-to-end communication. This, along with the diverse application of these networks in many different sce- narios such as battlefield and disaster recovery,

Mehran Abolhasan; Tadeusz A. Wysocki; Eryk Dutkiewicz

2004-01-01

412

Universities and Libraries Move to the Mobile Web  

ERIC Educational Resources Information Center

The convergence of web-enabled smartphones, the applications designed for smartphone interfaces, and cloud computing is rapidly changing how people interact with each other and with their environments. The commercial sector has taken the lead in creating mobile websites that leverage the capacities of smartphones, and the academic community has…

Aldrich, Alan W.

2010-01-01

413

Radiation safety of mobile phones and base stations.  

National Technical Information Service (NTIS)

The recent expansion of personal telecommunications has led to a rapid increase in the exposure of people to the radio-frequency (RF) radiation. Although the mobile phones are low power devices, the antenna is so close to the head that the local exposure ...

K. Jokela D. Leszczynski W. Paile S. Salomaa L. Puranen

1997-01-01

414

Can mobile virtual fitness apps replace human fitness trainer?  

Microsoft Academic Search

The increased need in promoting fitness activity and rapid growth of smart-phones has urged the development of mobile virtual fitness apps (MVFA). Yet, evaluation on these MVFA has been limited and, therefore, this study attempts to conduct preliminary evaluation on randomly sampled MVFA based on our proposed system workflow using theories of social support and persuasive technology, and the American

Ron Kwok Chi-Wai; Stanley Hui Sai-Chuen; Tania Mak So-Ning; Peter Wu Ka-Shun; Ken Lee Wing-Kuen; Clara Wong Choi-Ki

2011-01-01

415

Mobility of Plasmids†  

PubMed Central

Summary: Plasmids are key vectors of horizontal gene transfer and essential genetic engineering tools. They code for genes involved in many aspects of microbial biology, including detoxication, virulence, ecological interactions, and antibiotic resistance. While many studies have decorticated the mechanisms of mobility in model plasmids, the identification and characterization of plasmid mobility from genome data are unexplored. By reviewing the available data and literature, we established a computational protocol to identify and classify conjugation and mobilization genetic modules in 1,730 plasmids. This allowed the accurate classification of proteobacterial conjugative or mobilizable systems in a combination of four mating pair formation and six relaxase families. The available evidence suggests that half of the plasmids are nonmobilizable and that half of the remaining plasmids are conjugative. Some conjugative systems are much more abundant than others and preferably associated with some clades or plasmid sizes. Most very large plasmids are nonmobilizable, with evidence of ongoing domestication into secondary chromosomes. The evolution of conjugation elements shows ancient divergence between mobility systems, with relaxases and type IV coupling proteins (T4CPs) often following separate paths from type IV secretion systems. Phylogenetic patterns of mobility proteins are consistent with the phylogeny of the host prokaryotes, suggesting that plasmid mobility is in general circumscribed within large clades. Our survey suggests the existence of unsuspected new relaxases in archaea and new conjugation systems in cyanobacteria and actinobacteria. Few genes, e.g., T4CPs, relaxases, and VirB4, are at the core of plasmid conjugation, and together with accessory genes, they have evolved into specific systems adapted to specific physiological and ecological contexts.

Smillie, Chris; Garcillan-Barcia, M. Pilar; Francia, M. Victoria; Rocha, Eduardo P. C.; de la Cruz, Fernando

2010-01-01

416

Context Awareness and Adaptation in Mobile Learning  

Microsoft Academic Search

This study investigates the importance of context-awareness and adaptation in mobile learning. Context-aware mobile learning that senses mobile environment and reacts to changing context during learning process has four interaction modes with three mobile entities of different mobility. Contexts in mobile learning are categorized into six dimensions that form a context space. Several mobile learning systems are examined according to

Yuan-kai Wang

2004-01-01

417

Mobile transporter path planning  

NASA Technical Reports Server (NTRS)

The use of a genetic algorithm (GA) for solving the mobile transporter path planning problem is investigated. The mobile transporter is a traveling robotic vehicle proposed for the space station which must be able to reach any point of the structure autonomously. Elements of the genetic algorithm are explored in both a theoretical and experimental sense. Specifically, double crossover, greedy crossover, and tournament selection techniques are examined. Additionally, the use of local optimization techniques working in concert with the GA are also explored. Recent developments in genetic algorithm theory are shown to be particularly effective in a path planning problem domain, though problem areas can be cited which require more research.

Baffes, Paul; Wang, Lui

1990-01-01

418

Autonomous mobile robot teams  

NASA Technical Reports Server (NTRS)

This paper describes autonomous mobile robot teams performing tasks in unstructured environments. The behavior and the intelligence of the group is distributed, and the system does not include a central command base or leader. The novel concept of the Tropism-Based Cognitive Architecture is introduced, which is used by the robots in order to produce behavior transforming their sensory information to proper action. The results of a number of simulation experiments are presented. These experiments include worlds where the robot teams must locate, decompose, and gather objects, and defend themselves against hostile predators, while navigating around stationary and mobile obstacles.

Agah, Arvin; Bekey, George A.

1994-01-01

419

Correlation ion mobility spectroscopy  

DOEpatents

Correlation ion mobility spectrometry (CIMS) uses gating modulation and correlation signal processing to improve IMS instrument performance. Closely spaced ion peaks can be resolved by adding discriminating codes to the gate and matched filtering for the received ion current signal, thereby improving sensitivity and resolution of an ion mobility spectrometer. CIMS can be used to improve the signal-to-noise ratio even for transient chemical samples. CIMS is especially advantageous for small geometry IMS drift tubes that can otherwise have poor resolution due to their small size.

Pfeifer, Kent B. (Los Lunas, NM); Rohde, Steven B. (Corrales, NM)

2008-08-26

420

Mobile phones and driving.  

PubMed

Prior to the introduction of legislation in the United Kingdom, observational road-side studies showed that approximately 2 per cent of drivers use a mobile phone while driving. We studied the change in the usage rate of hand-held mobile phones from 10 weeks before to 10 weeks after the legislation came into force in December 2003. Across three different sites during the evening rush-hour, the usage rate changed from 1.85 to 0.97 per cent, a reduction of almost half. This change is attributed to the legislation. The effect of the legislation on accident and injury rates is unknown. PMID:15637105

Johal, Sandeep; Napier, Fiona; Britt-Compton, Jenny; Marshall, Tim

2005-03-01

421

Upward Mobility Program Handbook  

NASA Technical Reports Server (NTRS)

This handbook contains the policy and program objectives of the NASA Upward Mobility Program. In addition it gives guidance regarding program planning, implementation, and evaluation and also describes the roles and responsibilities of key personnel responsible for the successful implementation of the program. The Federal Personnel Manual Chapter 720 explains the Federal Government's policy on upward mobility and is available from the installation personnel office upon request. This handbook is applicable to all NASA installations. Unless specifically limited, all responsibilities set forth in this plan for the Installation Personnel Director may be administered wholly or in part by the Personnel Director's designee. This handbook will be revised by page changes.

1982-01-01

422

State-Controlled Licensure and Interstate Mobility: Questions from Katrina  

ERIC Educational Resources Information Center

State licensure laws in speech-language pathology and audiology vary from state to state. Natural disaster displacements as well as trends in job mobility have increased the need for licensees to be able to have more fluidity in practicing from 1 state to another. Additionally, literature reviews on the history of professional licensure…

Taylor, Carmen L.

2006-01-01

423

Stable flocking of mobile agents part I: dynamic topology  

Microsoft Academic Search

This is the second of a two-part paper, investigating the stability properties of a system of multiple mobile agents with double integrator dynamics. In this second part, we allow the topology of the control inter-connections between the agents in the group to vary with time. Specifically, the control law of an agent depends on the state of a set of

Herbert G. Tanner; Ali Jadbabaie; George J. Pappas

2003-01-01

424

Enhancing Health and Social Care Placement Learning through Mobile Technology  

ERIC Educational Resources Information Center

Health and social care students spend up to 50% of their course in practice. Placements are distributed across a wide geographical area and have varying degrees of IT access and support. Consequently, students may feel isolated from peers, academic staff, and resources required for effective learning. Mobile technology has considerable potential…

Lea, Susan; Callaghan, Lynne

2011-01-01

425

Call Admission Control for Mobile Multimedia Wireless Networks  

Microsoft Academic Search

Call Admission Control (CAC) policies in mobile cellular wireless networks give priority to handoff requests over new call requests. In the guard channel policy, an integer number of channels are reserved for handoff calls, while the fractional guard channel policy rejects new calls with a probability that varies with the current channel occupancy. The effect of reservations on new and

Sundus Mahmod; Harsha Sirisena; Krzysztof Pawlikowski

426

Dynamic Content Management and Delivery for Mobile Devices  

Microsoft Academic Search

Unlike desktop computers, mobile devices vary widely in terms of their capability. Screen size, colour depth, and supported file types are just some examples of where the variations are. Tailoring content to suit the capability of a device has been a research and practical problem for some time, and a variety of solutions exist. Content adaptation to cater for device

Sathiamoorthy Manoharan

2007-01-01

427

Ekalavya, Mobile Creches Annual Reports (Bombay) 1981-1982.  

ERIC Educational Resources Information Center

While specific subjects vary, the theme of this collection of seven articles is the nonformal education of adult migrants in India. The first article documents several aspects of adult education activities undertaken by Mobile Creches for Working Mothers' Children, an organization providing integrated day care for the children (from birth through…

Swaminathan, Mina, Ed.

428

Public School Choice and Student Mobility in Metropolitan Phoenix  

ERIC Educational Resources Information Center

Arizona's interdistrict open enrollment and charter schools laws allow families to send their children to the public schools of their choice. We assessed how public school choice affected elementary school enrollments in 27 metropolitan Phoenix school districts. Student mobility rates varied widely between districts and by location. The higher…

Powers, Jeanne M.; Topper, Amelia M.; Silver, Michael

2012-01-01

429

Modeling and control of formations of nonholonomic mobile robots  

Microsoft Academic Search

This paper addresses the control of a team of nonholonomic mobile robots navigating in a terrain with obstacles while maintaining a desired formation and changing formations when required, using graph theory. We model the team as a triple, , consisting of a group ele- ment that describes the gross position of the lead robot, a set of shape vari- ables

Jaydev P. Desai; James P. Ostrowski; Vijay Kumar

2001-01-01

430

Time varying arctic climate change amplification  

SciTech Connect

During the past 130 years the global mean surface air temperature has risen by about 0.75 K. Due to feedbacks -- including the snow/ice albedo feedback -- the warming in the Arctic is expected to proceed at a faster rate than the global average. Climate model simulations suggest that this Arctic amplification produces warming that is two to three times larger than the global mean. Understanding the Arctic amplification is essential for projections of future Arctic climate including sea ice extent and melting of the Greenland ice sheet. We use the temperature records from the Arctic stations to show that (a) the Arctic amplification is larger at latitudes above 700 N compared to those within 64-70oN belt, and that, surprisingly; (b) the ratio of the Arctic to global rate of temperature change is not constant but varies on the decadal timescale. This time dependence will affect future projections of climate changes in the Arctic.

Chylek, Petr [Los Alamos National Laboratory; Dubey, Manvendra K [Los Alamos National Laboratory; Lesins, Glen [DALLHOUSIE U; Wang, Muyin [NOAA/JISAO

2009-01-01

431

Inference of temporally varying Bayesian Networks  

PubMed Central

Motivation: When analysing gene expression time series data, an often overlooked but crucial aspect of the model is that the regulatory network structure may change over time. Although some approaches have addressed this problem previously in the literature, many are not well suited to the sequential nature of the data. Results: Here, we present a method that allows us to infer regulatory network structures that may vary between time points, using a set of hidden states that describe the network structure at a given time point. To model the distribution of the hidden states, we have applied the Hierarchical Dirichlet Process Hidden Markov Model, a non-parametric extension of the traditional Hidden Markov Model, which does not require us to fix the number of hidden states in advance. We apply our method to existing microarray expression data as well as demonstrating is efficacy on simulated test data. Contact: thomas.thorne@imperial.ac.uk

Thorne, Thomas; Stumpf, Michael P. H.

2012-01-01

432

Varying Fundamental Constants: A Dynamical Systems Approach  

NASA Astrophysics Data System (ADS)

Theory of dynamical systems offers a possibility of investigating the space of all possible solutions. In the context of simple cosmological models such like Varying Speed of Light Friedman- Robertson-Walker (VSL FRW) models there exists a systematic method of reducing field equations to certain two-dimensional dynamical system. One of the features of this reduction is the possibility of representing the model as a Hamiltonian system in which the properties of the potential function V(X) can serve as a tool for qualitative classification of possible evolutions of a(t). Some important features like resolution of the flatness problem, existence of event horizons near the singularity can be visualized as domains on the phase-space. Then one is able to see how large is the class of solutions (labelled by the initial conditions) leading to the desired property.

Biesiada, Marek

433

Climate dynamics: Why does climate vary?  

NASA Astrophysics Data System (ADS)

In recent years, climate change has become a major focus of public and political discussion. Ongoing scientific inquiry, revolving predominantly around understanding the anthropogenic effects of rising greenhouse gas levels, coupled with how successfully findings are communicated to the public, has made climate science both contentious and exigent. In the AGU monograph Climate Dynamics: Why Does Climate Vary?, editors De-Zheng Sun and Frank Bryan reinforce the importance of investigating the complex dynamics that underlie the natural variability of the climate system. Understanding this complexity—particularly how the natural variability of climate may enhance or mask anthropogenic warming—could have important consequences for the future. In this interview, Eos talks to De-Zheng Sun.

Schultz, Colin

2011-08-01

434

An ETAS model with varying productivity rates  

NASA Astrophysics Data System (ADS)

We present an epidemic type aftershock sequenc (ETAS) model where the offspring rates vary both spatially and temporally. This is achieved by distinguishing between those space-time volumes where the interpoint space and time distances are small, and those where they are considerably larger. We also question the nature of the background component in the ETAS model. Is it simply a temporal boundary correction (t = 0) or does it represent an additional tectonic process not described by the aftershock component? The form of these stochastic models should not be considered to be fixed. As we accumulate larger and better earthquake catalogues, GPS data, strain rates, etc., we have the ability to ask more complex questions about the nature of the process. By fitting modified models consistent with such questions, we should gain a better insight into the earthquake process. Hence, we consider a sequence of incrementally modified ETAS type models rather than `the' ETAS model.

Harte, D. S.

2014-05-01

435

An ETAS model with varying productivity rates  

NASA Astrophysics Data System (ADS)

We present an epidemic type aftershock sequenc (ETAS) model where the offspring rates vary both spatially and temporally. This is achieved by distinguishing between those space-time volumes where the interpoint space and time distances are small, and those where they are considerably larger. We also question the nature of the background component in the ETAS model. Is it simply a temporal boundary correction (t = 0) or does it represent an additional tectonic process not described by the aftershock component? The form of these stochastic models should not be considered to be fixed. As we accumulate larger and better earthquake catalogues, GPS data, strain rates, etc., we have the ability to ask more complex questions about the nature of the process. By fitting modified models consistent with such questions, we should gain a better insight into the earthquake process. Hence, we consider a sequence of incrementally modified ETAS type models rather than `the' ETAS model.

Harte, D. S.

2014-07-01

436

Chromatography with two mobile phases.  

PubMed

Experimental results for the investigation of chromatographic columns containing two mobile phases are presented. The eluent was composed of mixtures of methanol and carbon dioxide. The column was an uncoated fused-silica-lined stainless steel capillary column. At certain experimental conditions, the eluent divided into two phases, both of which moved through the column. The predominant component of the liquid phase was methanol whereas the gas phase was composed of at least 93 mol % CO2. The columns were studied over a range of feed compositions (45-95 mol % CO2), pressures (61-101 bar), and temperatures (30-100 degrees C). The compositions and densities of each phase were calculated from the Peng-Robinson equation of state. The residence times of the two mobile phases were determined by tracer pulse chromatography. The partition coefficients of a probe solute, benzene, were measured along with the retention times of neon and the total volume of the chromatographic column as a function of temperature, pressure, and stoichiometric feed composition. The calculated column volumes, that is the volume of the liquid and gas, were constant over the full range of feed composition. The partition coefficient of benzene was constant at fixed pressure and temperature, varied logarithmically with density at fixed temperature and feed composition, and displayed a maximum at intermediate temperatures at fixed pressure and feed composition. The measured retention times of neon were consistently equivalent to the calculated residence times of the gas phase, indicating that neon did not dissolve in the liquid phase and could thus serve as an accurate dead time marker. The implementation of chromatography with two mobile phases produces a chromatographic "window". There is a lower limit for the retention volume of all solutes, viz., the residence time of the gas phase, exactly the same as normal chromatography. However, elimination of the stationary phase produces an upper limit to the retention volumes of solutes. This upper limit is the residence time of the liquid phase, so there is a retention window such that tG < or = ti < or = tL for all solutes. PMID:16478118

Wang, M; Hou, S; Parcher, J F

2006-02-15

437

Camera motion and mobile imaging  

NASA Astrophysics Data System (ADS)

Due to the demanding size and cost constraints of camera phones, the mobile imaging industry needs to address several key challenges in order to achieve the quality of a digital still camera. Minimizing camera-motion introduced image blur is one of them. Film photographers have long used a rule-of-thumb that a hand held 35mm format film camera should have an exposure in seconds that is not longer than the inverse of the focal length in millimeters. Due to the lack of scientific studies on camera-motion, it is still an open question how to generalize this rule-of-thumb to digital still cameras as well as camera phones. In this paper, we first propose a generalized rule-of-thumb with the original rule-of-thumb as a special case when camera-motion can be approximated by a linear motion at 1.667 °/sec. We then use a gyroscope-based system to measure camera-motion patterns for two camera phones (one held with one hand and the other held in two hands) and one digital still camera. The results show that effective camera-motion function can be approximated very well by a linear function for exposure durations less than 100ms. While the effective camera-motion speed for camera phones (5.95 °/sec and 4.39 °/sec respectively) is significantly higher than that of digital still cameras (2.18 °/sec), it was found that holding a camera phone with two hands while taking pictures does reduce the amount of camera motion. It was also found that camera-motion not only varies significantly across subjects but also across captures for the same subject. Since camera phones have significantly higher motion and longer exposure durations than 35mm format film cameras and most digital still cameras, it is expected that many of the pictures taken by camera phones today will not meet the sharpness criteria used in 35mm film print. The mobile imaging industry is aggressively pursuing a smaller and smaller pixel size in order to meet the digital still camera's performance in terms of total pixels while retaining the small size needed for the mobile industry. This makes it increasingly more important to address the camera-motion challenge associated with smaller pixel size.

Xiao, Feng; Pincenti, John; John, George; Johnson, Kevin

2007-03-01

438

Efficacy of sperm mobility assessment in commercial flocks and the relationships of sperm mobility and insemination dose with fertility in turkeys.  

PubMed

Our objectives were to evaluate: 1) the efficacy of the Sperm Mobility Test on commercial turkey farms, and 2) the influence of sperm mobility phenotype on fertility when insemination parameters are varied. In research flocks, differences in sperm mobility among toms are predictive of fertility. We wanted to test the efficacy of this sire selection test in practical, real-world situations, evaluating its usefulness in terms of assessing large numbers of toms, different strains of turkeys, and variable management practices. Utilizing field study results, controlled studies were then conducted to improve test parameters. For the field trials, semen from each of 405 breeder toms (11 strains or lines) was evaluated either in duplicate (n = 285) or in triplicate (n = 120). Sperm mobility was normally distributed among all toms tested, except for one strain. Because the sperm mobility indices for toms evaluated in these field trials were higher than those observed in research flocks, the Sperm Mobility Test was modified to increase the separation between high and low sperm mobility phenotypes by increasing the concentration of Accudenz. To determine the effects of sperm mobility and insemination dose on sustained fertility through time, hens from a research flock were inseminated twice before the onset of lay with sperm from toms classified as high-, average-, or low-mobility in concentrations of 25 to 400 million sperm per artificial insemination dose, and egg fertility was evaluated over a 5-wk period. Toms with the high-mobility sperm phenotype maintained higher fertility (P < 0.05) over the 5-wk period at all insemination doses compared with toms with low-mobility sperm. Toms with high-mobility sperm sired equal numbers of poults in a sperm competition study in which numbers favored low-mobility toms by 3:1. These results demonstrate that the Sperm Mobility Test can be used for on-farm evaluation of semen quality of toms in commercial flocks and that sperm mobility influences fertility and sire fitness. PMID:11194043

King, L M; Kirby, J D; Froman, D P; Sonstegard, T S; Harry, D E; Darden, J R; Marini, P J; Walker, R M; Rhoads, M L; Donoghue, A M

2000-12-01

439

Mobility of icy sand packs, with application to Martian permafrost  

USGS Publications Warehouse

[1] The physical state of water on Mars has fundamental ramifications for both climatology and astrobiology. The widespread presence of "softened" Martian landforms (such as impact craters) can be attributed to viscous creep of subsurface ground ice. We present laboratory experiments designed to determine the minimum amount of ice necessary to mobilize topography within Martian permafrost. Our results show that the jammed-to-mobile transition of icy sand packs neither occurs at fixed ice content nor is dependent on temperature or stress, but instead correlates strongly with the maximum dry packing density of the sand component. Viscosity also changes rapidly near the mobility transition. The results suggest a potentially lower minimum volatile inventory for the impact-pulverized megaregolith of Mars. Furthermore, the long-term preservation of partially relaxed craters implies that the ice content of Martian permafrost has remained close to that at the mobility transition throughout Martian history. Copyright 2009 by the American Geophysical Union.

Durham, W. B.; Pathare, A. V.; Stern, L. A.; Lenferink, H. J.

2009-01-01

440

A robust signalling system for land mobile satellite services  

NASA Technical Reports Server (NTRS)

Presented here is a signalling system optimized to ensure expedient call set-up for satellite telephony services in a land mobile environment. In a land mobile environment, the satellite to mobile link is subject to impairments from multipath and shadowing phenomena, which result in signal amplitude and phase variations. Multipath, caused by signal scattering and reflections, results in sufficient link margin to compensate for these variations. Direct signal attenuation caused by shadowing due to buildings and vegetation may result in attenuation values in excess of 10 dB and commonly up to 20 dB. It is not practical to provide a link with sufficient margin to enable communication when the signal is blocked. When a moving vehicle passes these obstacles, the link will experience rapid changes in signal strength due to shadowing. Using statistical models of attenuation as a function of distance travelled, a communication strategy has been defined for the land mobile environment.

Irish, Dale; Shmith, Gary; Hart, Nick; Wines, Marie

1989-01-01

441

Deterministic Learning and Rapid Dynamical Pattern Recognition  

Microsoft Academic Search

Recognition of temporal\\/dynamical patterns is among the most difficult pattern recognition tasks. In this paper, based on a recent result on deterministic learning theory, a deterministic framework is proposed for rapid recognition of dynamical patterns. First, it is shown that a time-varying dynamical pattern can be effectively represented in a time-invariant and spatially distributed manner through deterministic learning. Second, a

Cong Wang; David J. Hill

2007-01-01

442

Methods of recording rapid wind changes  

NASA Technical Reports Server (NTRS)

The purpose of our research was to determine the rapid changes of air currents which impose varying stresses on the wings of airplanes. We attempted to express in figures the turbulence of the air, which perhaps plays some role in the behavior of airplanes in flight, as well as in the realization of certain methods of gliding flight. This is the reason which led us to conceive and develop the experimental equipment (hot-wire anemometer) described herein.

Magnan, A

1932-01-01

443

Distributed Mobility Management Scheme for Mobile IPv6  

NASA Astrophysics Data System (ADS)

Mobile IPv6 and Network Mobility (NEMO) have been standardized as IP extensions. While these technologies are planned to be adopted by several communities, such as the vehicle, aviation, and cellular industries, Mobile IPv6 has serious deployment issues such as scalability, protocol resilience, and redundancy. In these technologies, a special router called a home agent is introduced to support the movement of mobile nodes. This home agent introduces overlapping, inefficient routes, and becomes a single point of failure and a performance bottleneck. In this paper, a new concept for scalable and dependable mobility management scheme is proposed. Multiple home agents serve the same set of mobile nodes. The Home Agent Reliability protocol and Home Agent migration are introduced to achieve this concept. We also propose an overlay network named a Global Mobile eXchange (GMX) that efficiently handles data traffic from and to mobile nodes, and operates home agents as would an Internet eXchange Point (IXP).

Wakikawa, Ryuji; Valadon, Guillaume; Shigechika, Noriyuki; Murai, Jun

444

Rapid Runway Repair Study.  

National Technical Information Service (NTIS)

This report describes a series of tests to evaluate a system for rapidly repairing airfield pavement using polymer concrete (synthetic polymer plus aggregate), thermally cured by microwave power. The technique, developed by the Syracuse University Researc...

L. L. Boyko, R. G. Sawyer

1975-01-01

445

RAPID and DDS  

NASA Technical Reports Server (NTRS)

This talk gives an overview of the the Robot Applications Programmers Interface Delegate (RAPID) as well as the distributed systems middleware Data Distribution Service (DDS). DDS is an open software standard, RAPID is cleared for open-source release under NOSA. RAPID specifies data-structures and semantics for high-level telemetry published by NASA robotic software. These data-structures are supported by multiple robotic platforms at Johnson Space Center (JSC), Jet Propulsion Laboratory (JPL) and Ames Research Center (ARC), providing high-level interoperability between those platforms. DDS is used as the middleware for data transfer. The feature set of the middleware heavily influences the design decision made in the RAPID specification. So it is appropriate to discuss both in this introductory talk.

Utz, Hans Heinrich

2011-01-01

446

Probing charge scattering mechanisms in suspended graphene by varying its dielectric environment  

NASA Astrophysics Data System (ADS)

Graphene with high carrier mobility ? is required both for graphene-based electronic devices and for the investigation of the fundamental properties of Dirac fermions. An attractive approach to increase the mobility is to place graphene in an environment with high static dielectric constant ? that would screen the electric field due to the charged impurities present near graphene's surface. Here we investigate the effect of the dielectric environment of graphene and study electrical transport in multi-terminal graphene devices suspended in liquids with ? ranging from 1.9 to 33. For non-polar liquids (?<5), we observe a rapid increase of ?(?), with room-temperature mobility reaching ~60,000 cm2 Vs-1 for devices in anisole (?=4.3). We associate this trend with dielectric screening of charged impurities adsorbed on graphene. We observe much lower mobility ?~20,000 cm2 Vs-1 for devices in polar liquids (??18) and explain it by additional scattering caused by ions present in such liquids.

Newaz, A. K. M.; Puzyrev, Yevgeniy S.; Wang, Bin; Pantelides, Sokrates T.; Bolotin, Kirill I.

2012-03-01

447

Rapid Urinary Iodide Test  

Microsoft Academic Search

Assessment of iodine deficiency and monitoring of iodine supple- mentation programs demand rapid, simple, and cost-effective meth- ods for the determination of urinary iodide concentrations. We pro- pose a semiquantitative rapid test, based on the iodide-catalyzed oxidation of 3,39,5,59-tetramethylbenzidine by peracetic acid\\/H2O2 ,t o yield colored products. The color of the chemical reaction is compared with color categories of a

J. Rendl; D. BIER; T. GROH; C. REINERS

1998-01-01

448

A Mobile Agents Platform: Architecture, Mobility and Security Elements  

Microsoft Academic Search

\\u000a This paper presents a mobile agents platform called SyMPA, compliant with the specifications of the MASIF standard from the\\u000a OMG, that supports both stationary and mobile agents implemented using the high-level agent-oriented programming language\\u000a CLAIM. Agents designed thanks to CLAIM are endowed with cognitive capabilities, are able to communicate with other agents\\u000a and are mobile. The primitives of mobility are

Alexandru Suna; Amal El Fallah-seghrouchni

2004-01-01

449

A security framework for mobile-to-mobile payment network  

Microsoft Academic Search

This paper presents a framework for a mobile-to-mobile payment system, where a mobile phone, with or without SIM card, is used as an EMV payment instrument and is linked to a debit or credit account in a bank to pay any merchant who has a mobile phone or an on-line EMV capable terminal. In a single phone, multiple credit or

M. L. Das; A. Saxena; V. P. Gulati

2005-01-01

450

Mapping Oyster Reef Habitats in Mobile Bay  

NASA Technical Reports Server (NTRS)

Oyster reefs around the world are declining rapidly, and although they haven t received as much attention as coral reefs, they are just as important to their local ecosystems and economies. Oyster reefs provide habitats for many species of fish, invertebrates, and crustaceans, as well as the next generations of oysters. Oysters are also harvested from many of these reefs and are an important segment of many local economies, including that of Mobile Bay, where oysters rank in the top five commercial marine species both by landed weight and by dollar value. Although the remaining Mobile Bay oyster reefs are some of the least degraded in the world, projected climate change could have dramatic effects on the health of these important ecosystems. The viability of oyster reefs depends on water depth and temperature, appropriate pH and salinity levels, and the amount of dissolved oxygen in the water. Projected increases in sea level, changes in precipitation and runoff patterns, and changes in pH resulting from increases in the amount of carbon dioxide dissolved in the oceans could all affect the viability of oyster reefs in the future. Human activities such as dredging and unsustainable harvesting practices are also adversely impacting the oyster reefs. Fortunately, several projects are already under way to help rebuild or support existing or previously existing oyster reefs. The success of these projects will depend on the local effects of climate change on the current and potential habitats and man s ability to recognize and halt unsustainable harvesting practices. As the extent and health of the reefs changes, it will have impacts on the Mobile Bay ecosystem and economy, changing the resources available to the people who live there and to the rest of the country, since Mobile Bay is an important national source of seafood. This project identified potential climate change impacts on the oyster reefs of Mobile Bay, including the possible addition of newly viable habitats in the southeastern regions of the Bay.

Bolte, Danielle

2011-01-01

451

Mobile Agents Applications.  

ERIC Educational Resources Information Center

Discussion of the need to filter and retrieval relevant information from the Internet focuses on the use of mobile agents, specific software components which are based on distributed artificial intelligence and integrated systems. Surveys agent technology and discusses the agent building package used to develop two applications using IBM's Aglet…

Martins, Rosane Maria; Chaves, Magali Ribeiro; Pirmez, Luci; Rust da Costa Carmo, Luiz Fernando

2001-01-01

452

Mobile Agent Security.  

National Technical Information Service (NTIS)

Mobile agent technology offers a new computing paradigm in which a program, in the form of a software agent, can suspend its execution on a host computer, transfer itself to another agent-enabled host on the network, and resume execution on the new host. ...

W. Jansen T. Karygiannis

1998-01-01

453

Mobile Agent Architectures.  

National Technical Information Service (NTIS)

Mobile agent technology is a new research field. The purpose of this report is to take a closer look of this new field, identify its problems, and describe its current state. The theoretical section of this report defines the three properties of agents: m...

M. Persson

2000-01-01

454

Mobilizing the Moral Majority.  

ERIC Educational Resources Information Center

The Moral Majority has been more successful in mobilizing conservative Christians than three other evangelical groups--Third Century Publishers, Christian Voice, and the Religious Roundtable. According to the literature on social movements, four possible explanations for the success of such groups are that they have access to financial resources,…

Liebman, Robert C.

455

Advanced mobile phone service  

Microsoft Academic Search

The advanced mobile phone service (AMPS) system, an FM cellular radio system in the final stages of development, is described. A brief description of the system is followed by a discussion of the control algorithms which are basic to its operation. Finally, a status report is presented on the Chicago developmental system (an operational cellular system) and the cellular test

F. H. Blecher

1980-01-01

456

Mobile Equipment Expands Inventory.  

ERIC Educational Resources Information Center

Describes the Mobile Equipment Modules (MEM) system in Duluth, Minnesota. MEM is a way to hold down costs and increase learning opportunities by consolidating purchases of expensive shop equipment within the school district, grouping the equipment in modules, and scheduling and moving it from school to school as needed. (MF)

McGough, Robert L.; And Others

1978-01-01

457

Tourism and Mobile Technology  

Microsoft Academic Search

While tourism presents considerable potential for the use of new mobile technologies, we currently have little understanding of how tourists organise their activities or of the problems they face. This paper presents an ethnographic study of city tourists' practices that draws out a number of implications for designing tourist technology. We describe how tourists work together in groups, collaborate around

Barry Brown; Matthew Chalmers

2003-01-01

458

Mobility and Security  

Microsoft Academic Search

We discuss the computational aspects of wide area networks, and we describe var- ious facets of a process calculus devised to embody mobility, security, and wide area network semantics. These lecture notes are an abridged version of (8, 11, 27, 12, 13).

Luca Cardelli

2000-01-01

459

Mobile Code Security  

Microsoft Academic Search

Mobile code is an exciting new technology. By its very nature, however, it is fraught withinherent security risks. In the paper, we give an overview of some of the techniques for securingmobile code environments that have been suggested and deployed. We examine the sandboxapproach, code signing, hybrid approaches, firewalling techniques and proof carrying code. Therelative merits of each approach are

Aviel D. Rubin; Daniel E. Geer Jr.

1998-01-01

460

The IPA Mobility Program.  

ERIC Educational Resources Information Center

The Intergovernmental Personnel Act of 1970 Mobility Program and the procedure for applying for one of the temporary positions offered by the program are discussed. It is suggested that faculty members and university administrators are strong candidates for these positions in public policy development and government research. (SF)

Ershkowitz, Miriam

1979-01-01

461

Mobile Communication Via Satellite  

NASA Technical Reports Server (NTRS)

System mixes real-time and delayed-transmission channels. Combination of L-band and SHF links connect fixed and mobile equipment on ground to satellite relay. Software and hardware architecture conforms structure of open-system-interconnection model suggested by International Standards Organization.

Yan, Tsun-Yee; Naderi, Firouz M.

1988-01-01

462

Developing Mobile Based Instruction  

ERIC Educational Resources Information Center

This paper describes an instructional design class's experience developing instruction for the mobile web. The class was taught at a southeastern university in the United States in a master's level computer based instruction course. Two example projects are showcased and student reflections on design issues are highlighted. Additionally,…

Martin, Florence; Pastore, Raymond; Snider, Jean

2012-01-01

463

Boron mobility in plants  

Microsoft Academic Search

In the majority of plant species, B distribution between plant organs and the symptoms of B deficiency and toxicity indicate that B has restricted mobility. Nevertheless, B is present in phloem and is retranslocated in phloem, often in sufficient amounts to satisfy the demands of developing sink regions that do not readily transpire. In species that produce significant amounts of

Barry J. Shelp; Eduardo Marentes; Alice M. Kitheka; Pathmanathan Vivekanandan

1995-01-01

464

Boron mobility in plants  

Microsoft Academic Search

In the majority of plant species, B distribution between plant organs and the symptoms of B deficiency and toxicity indicate that B has restricted mobility. Nevertheless, B is present in phloem and is retranslocated in phloem, often in sufficient amounts to satisfy the demands of developing sink regions that do not readily transpire. In species that produce significant amounts of

Patrick H. Brown; Barry J. Shelp

1997-01-01

465

Spousal mobility and earnings.  

PubMed

An important finding in the literature on migration has been that the earnings of married women typically decrease with a move, while the earnings of married men often increase with a move, suggesting that married women are more likely to act as the "trailing spouse." This article considers a related but largely unexplored question: what is the effect of having an occupation that is associated with frequent migration on the migration decisions of a household and on the earnings of the spouse? Further how do these effects differ between men and women? The Public Use Microdata Sample from the 2000 U.S. decennial census is used to calculate migration rates by occupation and education. The analysis estimates the effects of these occupational mobility measures on the migration of couples and the earnings of married individuals. I find that migration rates in both the husband's and wife's occupations affect the household migration decision, but mobility in the husband's occupation matters considerably more. For couples in which the husband has a college degree (regardless of the wife's educational level), a husband's mobility has a large, significant negative effect on his wife's earnings, whereas a wife's mobility has no effect on her husband's earnings. This negative effect does not exist for college-educated wives married to non-college-educated husbands. PMID:19110900

McKinnish, Terra

2008-11-01

466

Mobile Learning for All  

ERIC Educational Resources Information Center

Parents and educational professionals are asking the question, "Are schools preparing students for their future lives?" Mobile technologies such as smart phones, iPods, GPS systems, iPads, and a constant stream of information drive much of people's world and work. The use of such technologies increases with each passing day. But how often do…

Bestwick, Angel; Campbell, John R.

2010-01-01

467

Mobile Strike force 2010.  

National Technical Information Service (NTIS)

This paper describes the Mobile Strike Force (MSF) 2010 analysis. This analysis provided input to the TRADOC Commander and the Chief of Staff of the Army to support decisions regarding FORCE XXI development and to the Battle Laboratory Integration and Tec...

T. J. Bailey S. R. George R. R. Groover B. P. Sheehan M. R. Anderson

1994-01-01

468

(Mobile K'' Filter program)  

SciTech Connect

This report documents progress through May 16, 1990 in the marketing of the Mobile K' filter. This air filter traps fine particulates. A total number of 167 of the filter units have been sold. An effort to increase sales by lowering the cost of the units by delivering the filters unassembled is under way. (GHH)

Not Available

1991-05-17

469

Mobile lighting apparatus  

DOEpatents

A mobile lighting apparatus includes a portable frame such as a moveable trailer or skid having a light tower thereon. The light tower is moveable from a stowed position to a deployed position. A hydrogen-powered fuel cell is located on the portable frame to provide electrical power to an array of the energy efficient lights located on the light tower.

Roe, George Michael; Klebanoff, Leonard Elliott; Rea, Gerald W; Drake, Robert A; Johnson, Terry A; Wingert, Steven John; Damberger, Thomas A; Skradski, Thomas J; Radley, Christopher James; Oros, James M; Schuttinger, Paul G; Grupp, David J; Prey, Stephen Carl

2013-05-14

470

Urban Mobility Report, 2010.  

National Technical Information Service (NTIS)

Congestion is still a problem in America's 439 urban areas. The economic recession and slow recovery of the last three years, however, have slowed the seemingly inexorable decline in mobility. Readers and policy makers might be tempted to view this as a c...

D. Schrank S. Turner T. Lomax

2010-01-01

471

A Mobile Education  

ERIC Educational Resources Information Center

Since 2008, when iStanford stormed onto the college scene as the first campus mobile app, schools from Amarillo College (Texas) to Vanderbilt University (Tennessee) have rushed to create their own offerings. Some have elected to do the work in-house; others have licensed the software from a vendor. Still others hope to bottle the same magic that…

Schaffhauser, Dian

2011-01-01

472

Toward a North American Standard for Mobile Data Services  

NASA Technical Reports Server (NTRS)

The rapid introduction of digital mobile communications systems is an important part of the emerging digital communications scene. These developments pose both a potential problem and a challenge. On one hand, these separate market driven developments can result in an uncontrolled mixture of analog and digital links which inhibit data modem services across the mobile/Public Switched network (PSTN). On the other hand, the near coincidence of schedules for development of some of these systems, i.e., Digital Cellular, Mobile Satellite, Land Mobile Radio, and ISDN, provides an opportunity to address interoperability problems by defining interfaces, control, and service standards that are compatible among these new services. In this paper we address the problem of providing data services interoperation between mobile terminals and data devices on the PSTN. The expected data services include G3 Fax, asynchronous data, and the government's STU-3 secure voice system, and future data services such as ISDN. We address a common architecture and a limited set of issues that are key to interoperable mobile data services. We believe that common mobile data standards will both improve the quality of data service and simplify the systems for manufacturers, data users, and service providers.

Dean, Richard A.; Levesque, Allen H.

1991-01-01

473

Mobility platform coupling device and method for coupling mobility platforms  

DOEpatents

A coupling device for connecting a first mobility platform to a second mobility platform in tandem. An example mobility platform is a robot. The coupling device has a loose link mode for normal steering conditions and a locking position, tight link mode for navigation across difficult terrain and across obstacles, for traversing chasms, and for navigating with a reduced footprint in tight steering conditions.

Shirey, David L. (Albuquerque, NM); Hayward, David R. (Albuquerque, NM); Buttz, James H. (Albuquerque, NM)

2002-01-01

474

Mobile cluster based call admission control in wireless mobile networks  

Microsoft Academic Search

For an efficient and effective connection admission control scheme in wireless mobile network, we propose mobile clustering based distributed call admission control (MC-DCA) scheme, which uses passive reservation information for predicting user mobility. Also, our scheme evaluates the prediction time that considers the call duration time and call dwell time before handoff neighbor cells for evaluating the overload probability.

Jeong-Jae Won; Eui-seok Hwang; Hyong-Woo Lee; Choong-Ho Cho

2003-01-01

475

Mobile IP LAN for ARL Mobile Communications/Networking Testbed.  

National Technical Information Service (NTIS)

This report describes the protocol and implementation of a Mobile IP (Internet protocol) LAN (local area network) for the LAN of the U.S. Army Research Laboratory (ARL) Mobile Communications/Networking Testbed. Mobile IP LAN protocol is developed to allow...

B. B. Luu

2001-01-01

476

Advanced extravehicular mobility unit study  

NASA Technical Reports Server (NTRS)

Components of the advanced extravehicular mobility unit (suit) are described. Design considerations for radiation protection, extravehicular operational pressure, mobility effects, tool/glove/effector, anthropometric definition, lighting, and equipment turnaround are addressed.

Elkins, W.

1982-01-01

477

Land Mobile Satellite Data System.  

National Technical Information Service (NTIS)

The Telesat Mobile Incorporated (TMI) Mobile Data System (MDS) was developed to apply satellite technology to the transportation industry's requirement for a fleet management system. It will provide two-way messaging and automatic position reporting capab...

J. D. B. Kent

1990-01-01

478

Future of Military Mobile Computing.  

National Technical Information Service (NTIS)

Significant and enduring are two words that reflect the reality we face today regarding mobile computing technologies. The ubiquity of smart phones, tablets, and other mobile computing devices in the commercial world makes cellular technologies a must for...

B. Caulkins

2012-01-01

479

Social mobility and educational selection  

Microsoft Academic Search

There is a close interactive relationship between social mobility and educational selection. On one side, the character, direction,\\u000a speed, level, methods and trends of social mobility affect the aims, goals, functions, scope, strategy, content and methods\\u000a of choice in education. On the other side, the goals, basis and means of choosing education promote inter-generational social\\u000a mobility, competitive mobility and structural

Zefang Dong; Yanbin Wang; Wenjiao Chen

2009-01-01

480

Trends in Mobile Application Development  

Microsoft Academic Search

Major software companies, such as Apple and Google, are disturbing the relatively safe and established actors of the mobile\\u000a application business. These newcomers have caused significant structural changes by imposing and enforcing their own rules\\u000a for the future of mobile application development. The implications of these changes do not only concern the mobile network\\u000a operators and mobile phone manufacturers. This

Adrian Holzer; Jan Ondrus

2009-01-01

481

Mobile Data Management with Sound  

Microsoft Academic Search

\\u000a This study introduces a sound-based mobile payment system. Using a mobile phone for payment for mobile commerce is essential\\u000a for its success. The proposed system will use sound that is generated from the existing mobile phone and the sound can be\\u000a recognized by the existing credit card reader of the shop with an installation of an ordinary microphone and simple

Ook Lee

2004-01-01

482

Memristive biosensors under varying humidity conditions.  

PubMed

We attempt to examine the potential of silicon nanowire memristors in the field of nanobiosensing. The memristive devices are crystalline Silicon (Si) Nanowires (NWs) with Nickel Silicide (NiSi) terminals. The nanowires are fabricated on a Silicon-on-Insulator (SOI) wafer by an Ebeam Lithography Technique (EBL) process that allows high resolution at the nanoscale. A Deep Reactive Ion Etching (DRIE) technique is used to define free-standing nanowires. The close alignment between Silicon (Si) and Nickel-Silicide (NiSi) terminals forms a Schottky-barrier at their junction. The memristive effect of the fabricated devices matches well with the memristor theory. An equivalent circuit reproducing the memristive effect in current-voltage (I-V) characteristics of our silicon nanowires is presented too. The memristive silicon nanowire devices are then functionalized with anti-human VEGF (Vascular Endothelial Growth Factor) antibody and I-V characteristics are examined for the nanowires prior to and after protein functionalization. The uptake of bio-molecules linked to the surface of the memristive NWs is confirmed by the increased voltage gap in the hysteresis curve. The effects of varying humidity conditions on the conductivity of bio-modified memristive silicon nanowires are deeply investigated. PMID:24594511

Puppo, Francesca; Dave, Akshat; Doucey, Marie-Agnès; Sacchetto, Davide; Baj-Rossi, Camilla; Leblebici, Yusuf; De Micheli, Giovanni; Carrara, Sandro

2014-03-01

483

Serotonin release varies with brain tryptophan levels  

NASA Technical Reports Server (NTRS)

This study examines directly the effects on serotonin release of varying brain tryptophan levels within the physiologic range. It also addresses possible interactions between tryptophan availability and the frequency of membrane depolarization in controlling serotonin release. We demonstrate that reducing tryptophan levels in rat hypothalamic slices (by superfusing them with medium supplemented with 100 microM leucine) decreases tissue serotonin levels as well as both the spontaneous and the electrically-evoked serotonin release. Conversely, elevating tissue tryptophan levels (by superfusing slices with medium supplemented with 2 microM tryptophan) increases both the tissue serotonin levels and the serotonin release. Serotonin release was found to be affected independently by the tryptophan availability and the frequency of electrical field-stimulation (1-5 Hz), since increasing both variables produced nearly additive increases in release. These observations demonstrate for the first time that both precursor-dependent elevations and reductions in brain serotonin levels produce proportionate changes in serotonin release, and that the magnitude of the tryptophan effect is unrelated to neuronal firing frequency. The data support the hypothesis that serotonin release is proportionate to intracellular serotonin levels.

Schaechter, Judith D.; Wurtman, Richard J.

1990-01-01

484

Dermatophyte susceptibility varies towards antimicrobial textiles.  

PubMed

Dermatophytoses are a widespread problem worldwide. Textiles in contact with infected skin can serve as a carrier for fungus propagation. Hitherto, it is unknown, whether antifungal textiles could contribute in controlling dermatophytes e.g. by disrupting the chain of infection. Testing of antimicrobial fabrics for their antifungal activities therefore is a fundamental prerequisite to assess the putative clinical relevance of textiles for dermatophyte prevention. Fabrics finished with either didecyldimethylammonium chloride (DDAC), poly-hexamethylenbiguanide, copper and two silver chloride concentrations were tested for their antifungal activity against Trichophyton rubrum, Trichophyton mentagrophytes and Candida albicans. To prove dermatophyte susceptibility towards the textiles, swatches were subjected to DIN EN 14199 (Trichophyton sp.) or DIN EN ISO 20743 (C.?albicans) respectively. In addition, samples were embedded, and semi-thin sections were analysed microscopically. While all samples showed a clear inhibition of C.?albicans, activity against Trichophyton sp. varied significantly: For example, DDAC completely inhibited T.?rubrum growth, whereas T.?mentagrophytes growth remained unaffected even in direct contact to the fibres. The results favour to add T.?mentagrophytes as a test organism in textile dermatophyte efficacy tests. Microscopic analysis of swatches allowed detailed evaluation of additional parameters like mycelium thickness, density and hyphae penetration depth into the fabric. PMID:21914005

Hammer, Timo R; Mucha, Helmut; Hoefer, Dirk

2012-07-01

485

Time-varying modeling of cerebral hemodynamics.  

PubMed

The scientific and clinical importance of cerebral hemodynamics has generated considerable interest in their quantitative understanding via computational modeling. In particular, two aspects of cerebral hemodynamics, cerebral flow autoregulation (CFA) and CO2 vasomotor reactivity (CVR), have attracted much attention because they are implicated in many important clinical conditions and pathologies (orthostatic intolerance, syncope, hypertension, stroke, vascular dementia, mild cognitive impairment, Alzheimer's disease, and other neurodegenerative diseases with cerebrovascular components). Both CFA and CVR are dynamic physiological processes by which cerebral blood flow is regulated in response to fluctuations in cerebral perfusion pressure and blood CO2 tension. Several modeling studies to date have analyzed beat-to-beat hemodynamic data in order to advance our quantitative understanding of CFA-CVR dynamics. A confounding factor in these studies is the fact that the dynamics of the CFA-CVR processes appear to vary with time (i.e., changes in cerebrovascular characteristics) due to neural, endocrine, and metabolic effects. This paper seeks to address this issue by tracking the changes in linear time-invariant models obtained from short successive segments of data from ten healthy human subjects. The results suggest that systemic variations exist but have stationary statistics and, therefore, the use of time-invariant modeling yields "time-averaged models" of physiological and clinical utility. PMID:24184697

Marmarelis, Vasilis Z; Shin, Dae C; Orme, Melissa; Rong Zhang

2014-03-01

486

Varying Collimation for Dark-Field Extraction  

PubMed Central

Although x-ray imaging is widely used in biomedical applications, biological soft tissues have small density changes, leading to low contrast resolution for attenuation-based x-ray imaging. Over the past years, x-ray small-angle scattering was studied as a new contrast mechanism to enhance subtle structural variation within the soft tissue. In this paper, we present a detection method to extract this type of x-ray scattering data, which are also referred to as dark-field signals. The key idea is to acquire an x-ray projection multiple times with varying collimation before an x-ray detector array. The projection data acquired with a collimator of a sufficiently high collimation aspect ratio contain mainly the primary beam with little scattering, while the data acquired with an appropriately reduced collimation aspect ratio include both the primary beam and small-angle scattering signals. Then, analysis of these corresponding datasets will produce desirable dark-field signals; for example, via digitally subtraction. In the numerical experiments, the feasibility of our dark-field detection technology is demonstrated in Monte Carlo simulation. The results show that the acquired dark field signals can clearly reveal the structural information of tissues in terms of Rayleigh scattering characteristics.

Wang, Ge; Cong, Wenxiang; Shen, Haiou; Zou, Yu

2009-01-01

487

Vector curvaton with varying kinetic function  

SciTech Connect

A new model realization of the vector curvaton paradigm is presented and analyzed. The model consists of a single massive Abelian vector field, with a Maxwell-type kinetic term. By assuming that the kinetic function and the mass of the vector field are appropriately varying during inflation, it is shown that a scale-invariant spectrum of superhorizon perturbations can be generated. These perturbations can contribute to the curvature perturbation of the Universe. If the vector field remains light at the end of inflation it is found that it can generate substantial statistical anisotropy in the spectrum and bispectrum of the curvature perturbation. In this case the non-Gaussianity in the curvature perturbation is predominantly anisotropic, which will be a testable prediction in the near future. If, on the other hand, the vector field is heavy at the end of inflation then it is demonstrated that particle production is approximately isotropic and the vector field alone can give rise to the curvature perturbation, without directly involving any fundamental scalar field. The parameter space for both possibilities is shown to be substantial. Finally, toy models are presented which show that the desired variation of the mass and kinetic function of the vector field can be realistically obtained, without unnatural tunings, in the context of supergravity or superstrings.

Dimopoulos, Konstantinos; Karciauskas, Mindaugas; Wagstaff, Jacques M. [Physics Department, Lancaster University, Lancaster LA1 4YB (United Kingdom)

2010-01-15

488

Filtration behavior of slurries with varying compressibilities  

SciTech Connect

A novel filtration apparatus allows simultaneous measurements of filtrate volume, hydraulic pressure and cake thickness using slurry volumes on the order of 100 cm/sup 3/. Differences in interparticle interactions were studied by varying the barium chloride concentration of 0.38-..mu..m polystyrene latex and filtering at pressures between 2 and 100 psi. Cakes formed from these slurries are highly compressible for concentrations between 0.01M and 0.10M, moderately compressible for the 0.005M concentration, and incompressible for the 0.001M concentration. Plots of filtrate volume versus cake thickness were linear for the incompressible cakes, whereas the compressible cakes showed significant deviations, which were pressure dependent. The pressure distribution for the incompressible cake was found to be essentially linear as predicted from the resistance plots assuming constant ..cap alpha.. and epsilon. For the highly compressible cakes, most of the pressure drop appears to occur near the cake/medium interface with only small changes occurring at the top of the cake.

Massuda, M.; Bridger, K.; Harvey, M.; Tiller, F.M.

1988-10-01

489

General dynamics of varying-alpha universes  

NASA Astrophysics Data System (ADS)

We introduce and study extensions of the varying alpha theory of Bekenstein-Sandvik-Barrow-Magueijo to allow for an arbitrary coupling function and self-interaction potential term in the theory. We study the full evolution equations without assuming that variations in alpha have a negligible effect on the expansion scale factor and the matter density evolution, as was assumed in earlier studies. The background Friedmann-Robertson-Walker cosmology of this model in the cases of zero and nonzero spatial curvature is studied in detail, using dynamical systems techniques, for a wide class of potentials and coupling functions. All the asymptotic behaviors are found, together with some new solutions. We study the cases where the electromagnetic parameter, zeta, is positive and negative, corresponding to magnetic and electrostatic energy domination in the nonrelativistic matter. In particular, we investigate the cases where the scalar field driving alpha variations has exponential and power-law self-interaction potentials and the behavior of theories where the coupling constant between matter and alpha variations is no longer a constant.

Barrow, John D.; Graham, Alexander A. H.

2013-11-01

490

Time-Varying Modeling of Cerebral Hemodynamics  

PubMed Central

The scientific and clinical importance of cerebral hemodynamics has generated considerable interest in their quantitative understanding via computational modeling. In particular, two aspects of cerebral hemodynamics, Cerebral Flow Autoregulation (CFA) and CO2 Vasomotor Reactivity (CVR), have attracted much attention because they are implicated in many important clinical conditions and pathologies (orthostatic intolerance, syncope, hypertension, stroke, vascular dementia, MCI, Alzheimer’s disease and other neurodegenerative diseases with cerebrovascular components). Both CFA and CVR are dynamic physiological processes by which cerebral blood flow is regulated in response to fluctuations in cerebral perfusion pressure and blood CO2 tension. Several modeling studies to date have analyzed beat-to-beat hemodynamic data in order to advance our quantitative understanding of CFA-CVR dynamics. A confounding factor in these studies is the fact that the dynamics of the CFA-CVR processes appear to vary with time (i.e. changes in cerebrovascular characteristics) due to neural, endocrine and metabolic effects. This paper seeks to address this issue by tracking the changes in linear time-invariant models obtained from short successive segments of data from 10 healthy human subjects. The results suggest that systemic variations exist but have stationary statistics and, therefore, the use of time-invariant modeling yields “time-averaged models” of physiological and clinical utility.

Marmarelis, Vasilis Z.; Shin, Dae C.; Orme, Melissa; Zhang, Rong

2014-01-01

491

Multidirectional mobilities: Advanced measurement techniques and applications  

NASA Astrophysics Data System (ADS)

Today high noise-and-vibration comfort has become a quality sign of products in sectors such as the automotive industry, aircraft, components, households and manufacturing. Consequently, already in the design phase of products, tools are required to predict the final vibration and noise levels. These tools have to be applicable over a wide frequency range with sufficient accuracy. During recent decades a variety of tools have been developed such as transfer path analysis (TPA), input force estimation, substructuring, coupling by frequency response functions (FRF) and hybrid modelling. While these methods have a well-developed theoretical basis, their application combined with experimental data often suffers from a lack of information concerning rotational DOFs. In order to measure response in all 6 DOFs (including rotation), a sensor has been developed, whose special features are discussed in the thesis. This transducer simplifies the response measurements, although in practice the excitation of moments appears to be more difficult. Several excitation techniques have been developed to enable measurement of multidirectional mobilities. For rapid and simple measurement of the loaded mobility matrix, a MIMO (Multiple Input Multiple Output) technique is used. The technique has been tested and validated on several structures of different complexity. A second technique for measuring the loaded 6-by-6 mobility matrix has been developed. This technique employs a model of the excitation set-up, and with this model the mobility matrix is determined from sequential measurements. Measurements on ``real'' structures show that both techniques give results of similar quality, and both are recommended for practical use. As a further step, a technique for measuring the unloaded mobilities is presented. It employs the measured loaded mobility matrix in order to calculate compensation forces and moments, which are later applied in order to compensate for the loading of the measurement equipment. The developed measurement techniques have been used in a hybrid coupling of a plate-and-beam structure to study different aspects of the coupling technique. Results show that RDOFs are crucial and have to be included in this case. The importance of stiffness residuals when mobilities are estimated from modal superposition is demonstrated. Finally it is shown that proper curve fitting can correct errors from inconsistently measured data.

Ivarsson, Lars Holger

492

3-D MIMO Mobile-to-Mobile Channel Simulation  

Microsoft Academic Search

Mobile-to-mobile (M-to-M) radio propagation channels arise in inter-vehicular communications, mobile ad-hoc wireless networks, and relay-based cellular radio networks. The statistical properties of M-to-M channels are quite different from conventional flxed-to-mobile (F-to-M) cellular land mobile radio channels. This article presents a 3D mathematical reference model for multiple-input multiple-output (MIMO) M-to-M channels. Based on this model, a sum-of-sinusoids based simulation model is

Alenka G. Zajic; G. L. Stuber

2007-01-01

493

Assessing and Managing Mobile Technostress  

Microsoft Academic Search

From time to time, new technology brings people impacts. Mobile information system provides new way for manipulating information in both directions, sending out and bringing in. Anywhere and anytime are both the characteristics of mobile technology that people could get rid of. The purpose of this study was to explore mobile technostress and bring up the discussion of assessing and

Jui-Chen Yu; Lung-Hsing Kuo; Li-Min Chen; Hung-Jen Yang; Hsieh-Hua Yang; Wen-Chen Hu

2009-01-01

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