Sample records for kyu network yo

  1. Swinging Yo-Yo

    NSDL National Science Digital Library

    Rebecca Thompson

    2011-01-01

    Learners build a pendulum from a yo-yo, and then design their own experiment to determine what affects the pendulum's period of swing. They can alter the mass of the yo-yo by adding play dough, the length of the yo-yo string, or some other variable of their own choosing. Learners collect data and graph their results. This activity starts on p.17 of the manual. This manual contains 4 activities related to the Spectra's Force comic book published by the American Physical Society.

  2. Bouncing Yo-Yo

    NSDL National Science Digital Library

    Watsonville Environmental Science Workshop

    2011-01-01

    In this activity, learners build unique yo-yos, which spin round and round without moving up and down. Learners can construct their yo-yos out of wood using a saw and drill or more simply, out of a paper plate. Use this activity to explore angular motion, center of gravity, and energy. Note: a drill and saw may be used during this activity, but are not included in the cost of materials.

  3. Yo-yo Pull Demonstration

    NASA Astrophysics Data System (ADS)

    Layton, William

    2013-03-01

    A popular demonstration involves placing a yo-yo on a level table and gently pulling the string horizontally when it is wrapped to come out below the center of the yo-yo's axis. Students are then asked to predict which way the yo-yo will move. A similar demonstration is performed with a tricycle by pulling forward on a pedal with the pedal down in its lowest position.2,3 As well as pulling the yo-yo horizontally, often the string is lifted until the angle it makes with the table causes no motion. This occurs when the line extended from the string intersects the point of contact of the yo-yo with the table.4 This paper describes an apparatus that extends these demonstrations to the situation where the force pulling the yo-yo is still horizontal yet is below the level of the table.

  4. Yo-Yo Pull Demonstration

    ERIC Educational Resources Information Center

    Layton, William

    2013-01-01

    A popular demonstration involves placing a yo-yo on a level table and gently pulling the string horizontally when it is wrapped to come out below the center of the yo-yo's axis. Students are then asked to predict which way the yo-yo will move. A similar demonstration is performed with a tricycle by pulling forward on a pedal with the pedal down in…

  5. The Yo-Yo Problem

    NSDL National Science Digital Library

    PBS

    2012-01-01

    In this math lesson, learners explore linear patterns, write a pattern in symbolic form, and solve linear equations using algebra tiles, symbolic manipulation, and a graphing calculator. The lesson begins with the presentation of the yo-yo problem. Then learners complete a hands-on activity involving a design created with pennies. Algebra tiles are introduced next as learners practice solving linear equations. Finally, learners return to solving the yo-yo problem.

  6. Recycled Yo-Yo Challenge

    NSDL National Science Digital Library

    2012-06-26

    In this activity, learners are challenged to build their own yo-yo toys using items found in their recycling bins. Learners search for materials to use for each part of the toy: two discs, an axle, and string. Learners then sketch their invention, assemble the parts, and test it out. Learners are encouraged to tweak their yo-yos and make improvements.

  7. Museum of Yo-Yo History

    NSDL National Science Digital Library

    2004-01-01

    Perhaps no toy is as maligned as the yo-yo, despite its long and colorful history. The roots of the yo-yo can be traced back to antiquity, and there is even a Grecian urn in the collection of the Metropolitan Museum of Art that depicts that most well-known of yo-yo maneuvers: walking the dog. Visitors with a penchant for the yo-yo will appreciate the wide range of materials that can be found on the site, particularly the rather compelling online exhibit of highly valuable yo-yos, such as the 1984 Olympics No Jive model. For those who want to continue their exploration of the yo-yo, there is the â??Profiles & Historyâ? area, which contains player and company profiles, along with historical photographs of yo-yos in action.

  8. MuON: Epidemic Based Mutual Anonymity Neelesh Bansod Ashish Malgi Byung Kyu Choi

    E-print Network

    Choi, Byung K.

    MuON: Epidemic Based Mutual Anonymity Neelesh Bansod Ashish Malgi Byung Kyu Choi Jean Mayo Michigan investigation. This paper presents MuON, a protocol to achieve mu- tual anonymity in unstructured P2P networks. MuON lever- ages epidemic-style data dissemination to deal with the high churn (changes in system

  9. Douglas YO-31A

    NASA Technical Reports Server (NTRS)

    1932-01-01

    Douglas YO-31A: The mockup model of the gull-winged Douglas YO-31A observation plane was tested in Langley's 30 x 60 Full Scale Tunnel during 1932. As part of the drag clean-up that was under examination of the YO-31, the model aircraft was 'flown' in the tunnel with and without the wheel fairings.

  10. Social network recruitment for Yo Puedo: an innovative sexual health intervention in an underserved urban neighborhood—sample and design implications.

    PubMed

    Minnis, Alexandra M; vanDommelen-Gonzalez, Evan; Luecke, Ellen; Cheng, Helen; Dow, William; Bautista-Arredondo, Sergio; Padian, Nancy S

    2015-02-01

    Most existing evidence-based sexual health interventions focus on individual-level behavior, even though there is substantial evidence that highlights the influential role of social environments in shaping adolescents' behaviors and reproductive health outcomes. We developed Yo Puedo, a combined conditional cash transfer and life skills intervention for youth to promote educational attainment, job training, and reproductive health wellness that we then evaluated for feasibility among 162 youth aged 16-21 years in a predominantly Latino community in San Francisco, CA. The intervention targeted youth's social networks and involved recruitment and randomization of small social network clusters. In this paper we describe the design of the feasibility study and report participants' baseline characteristics. Furthermore, we examined the sample and design implications of recruiting social network clusters as the unit of randomization. Baseline data provide evidence that we successfully enrolled high risk youth using a social network recruitment approach in community and school-based settings. Nearly all participants (95%) were high risk for adverse educational and reproductive health outcomes based on multiple measures of low socioeconomic status (81%) and/or reported high risk behaviors (e.g., gang affiliation, past pregnancy, recent unprotected sex, frequent substance use; 62%). We achieved variability in the study sample through heterogeneity in recruitment of the index participants, whereas the individuals within the small social networks of close friends demonstrated substantial homogeneity across sociodemographic and risk profile characteristics. Social networks recruitment was feasible and yielded a sample of high risk youth willing to enroll in a randomized study to evaluate a novel sexual health intervention. PMID:25358834

  11. Mechanical study of a modern yo-yo

    NASA Astrophysics Data System (ADS)

    de Izarra, Charles

    2011-07-01

    This paper presents the study of a modern yo-yo having a centrifugal clutch allowing the free rolling. First, the mechanical parts of the yo-yo are measured, allowing us to determine analytically its velocity according to its height of fall. Then, we are more particularly interested in the centrifugal device constituted by springs and small masses. The physics of this toy is suitable for undergraduate students, illustrating the concepts of dynamics of rigid bodies and of potential energy.

  12. The Yo-Yo Problem: Solving Linear Equations

    NSDL National Science Digital Library

    2007-12-12

    In this lesson, students explore linear patterns, write a pattern in symbolic form, and solve linear equations using algebra tiles, symbolic manipulation, and the graphing calculator. The lesson starts with the presentation of the yo-yo problem. Students then complete a hands-on activity involving a design created with pennies that allows them to explore a linear pattern and express that pattern in symbolic form. Algebra tiles are introduced as the students practice solving linear equations. Working from the concrete to the abstract is especially important for students who have difficulty with mathematics, and algebra tiles help students make this transition. In addition to using algebra tiles, students also use symbolic manipulation and the graphing calculator. Finally, the students return to solve the yo-yo problem. A feature of this lesson is the effective use of peer tutors in this inclusion classroom. Student worksheets are included to print.

  13. Exploring functional structure through system organization: Caenorhabditis elegans neuronal network

    E-print Network

    Park, Namkyoo

    Exploring functional structure through system organization: Caenorhabditis elegans neuronal network, systemic organization, modular structure, functional circuit #12; Hyeok Jung Kang1 , Myung-Kyu Choi2, Junho Lee2 , Namkyoo Park*1 *nkpark@snu.ac.kr 1 Photonic Systems

  14. Si, Yo Puedo Controlar Mi Diabetes!

    E-print Network

    ¡Si, Yo Puedo Controlar Mi Diabetes! ¡Si, Yo Puedo Controlar Mí Diabetes! (Si, Yo Puedo/Latinos with diabetes. The curriculum is predicated on the American Diabetes Association's national standards of care and lifestyle skills to better control their diabetes. Relevance · Diabetes costs Texas more than 12 billion

  15. AIAA-99-4227 RAPID ENERGY DISSIPATION IN A YO-YO-TYPE WIRE BOOM DEPLOYMENT SYSTEM

    E-print Network

    Psiaki, Mark L.

    AIAA-99-4227 RAPID ENERGY DISSIPATION IN A YO-YO-TYPE WIRE BOOM DEPLOYMENT SYSTEM by Mark L. Psiaki A wire boom deployment system has been developed that uses a mechanism which is similar to the classic yo-yo sounding-rocket experiment. The main challenge in using a yo-yo-type mechanism is to dissipate the excess

  16. The Yo-Yo Intermittent Recovery Test: Physiological Response, Reliability, and Validity

    Microsoft Academic Search

    PETER KRUSTRUP; MAGNI MOHR; TOMMAS AMSTRUP; TORBEN RYSGAARD; JOHNNY JOHANSEN; ADAM STEENSBERG; PREBEN K. PEDERSEN; JENS BANGSBO

    2003-01-01

    KRUSTRUP, P., M. MOHR, T. AMSTRUP, T. RYSGAARD, J. JOHANSEN, A. STEENSBERG, P. K. PEDERSEN, and J. BANGSBO. The Yo-Yo Intermittent Recovery Test: Physiological Response, Reliability, and Validity. Med. Sci. Sports Exerc., Vol. 35, No. 4, pp. 697-705, 2003. Purpose: To examine the physiological response and reproducibility of the Yo-Yo intermittent recovery test and its application to elite soccer. Methods:

  17. Thermal-aware Steiner Routing for 3D Stacked ICs Mohit Pathak and Sung Kyu Lim

    E-print Network

    Lim, Sung Kyu

    Thermal-aware Steiner Routing for 3D Stacked ICs Mohit Pathak and Sung Kyu Lim School of Electrical algorithm builds a delay-oriented Steiner tree under a given thermal profile. We show that thermal-aware 3D for further thermal optimization under performance constraint. We employ a novel scheme to relax the initial

  18. A Design Tradeoff Study with Monolithic 3D Integration Chang Liu and Sung Kyu Lim

    E-print Network

    Lim, Sung Kyu

    A Design Tradeoff Study with Monolithic 3D Integration Chang Liu and Sung Kyu Lim Georgia Institute various design tradeoffs existing in the monolithic 3D integration technology. Different design styles in monolithic 3D ICs are studied, including transistor-level monolithic integration (MI- TR) and gate

  19. YO-3A parked on ramp

    NASA Technical Reports Server (NTRS)

    1997-01-01

    NASA's YO-3A parked on the Dryden ramp. The YO-3A aircraft was originally a Schweizer SGS-2-23 sailplane. During the late 1960s Lockheed modified over a dozen of these sailplanes to create ultra-quiet observation aircraft for use over South Vietnam during the conflict there. This particular YO-3A flew combat missions and was later sold to an airframe and powerplant mechanics school. NASA's Ames Research Center at Mountain Veiw, California, acquired the aircraft from the school in 1978. It restored the YO-3A to flight status and fitted it with wing- and tail-mounted microphones as an accoustic research aircraft. Ames operated it at Edwards Air Force Base for noise measurements of helicopters and tilt rotor aircraft. One set of tests in December 1995 obtained free-flight noise data on the XV-15 tilt rotor. NASA also used the YO-3A for sonic boom measurements of a NASA SR-71 assigned to the Dryden Flight Research Center. NASA transferred the YO-3A to Dryden in December 1997, and as of April 2001 it was in flyable storage there. The designation YO-3A indicates that this aircraft was a pre-production (Y) observation (O) aircraft. Even though the YO-3A saw operational use, the Y designation was never removed. Its 210-horsepower Continental V-6 was modified to reduce noise. The engine was connected to a propeller through a belt-driven reduction system. This reduced the propeller's rotation speed. The propeller blades themselves were made of birch plywood and were wider than standard propellers. The result of these modifications was an aircraft so quiet that its noise was drowned out by the background sounds.

  20. our answers t scuss with yo

    E-print Network

    Borenstein, Elhanan

    you like to be tested for sexually transmitted infections today? yes no tell me more E BIRTH CONTROL METHOD Are you currently using birth control? yes no If no, skip to section F. Which birth control method DOB our answers t scuss with yo ame: _______ ate of birth: __ ho is your pri o you have an rson

  1. Discriminative ability of the Yo-Yo intermittent recovery test (level 1) in prospective young soccer players.

    PubMed

    Markovic, Goran; Mikulic, Pavle

    2011-10-01

    We evaluated the sensitivity of the Yo-Yo intermittent recovery test-level 1 (Yo-Yo IR1) when discriminating among players in varying playing positions and different age categories in youth soccer. One-hundred and six prospective young soccer players, grouped on the basis of chronological age (under-13, under-14, under-15, under-16, under-17, under-18, and under-19) and playing position (center-backs, fullbacks, center midfielders, wide midfielders, and forwards), participated in the study. The players were administered a single Yo-Yo IR1 test at the beginning of the spring season. Analysis of variance revealed significant (F = 25.3; p < 0.001) group differences in Yo-Yo IR1 test performance scores among the observed age categories, and a systematic age-related increase in the Yo-Yo IR1 test performance was evident. Subsequent post hoc comparisons identified a number of significant differences among the selected age categories in Yo-Yo IR1 test performance. Analysis of covariance identified significant differences among playing positions (F = 3.1; p < 0.019) in the Yo-Yo IR1 test performance after controlling for age (F = 135.1; p < 0.001). Subsequent pairwise comparisons of the adjusted Yo-Yo IR1 test performance identified that center-backs had achieved significantly lower (all p < 0.01) performance scores than center midfielders, wide midfielders, and forwards, but not fullbacks. These results could be of practical value to coaches and scientists for further development of talent selection and profiling procedures in soccer, particularly because (a) the endurance performance represents a very important fitness component in selection and profiling of young soccer players and (b) the Yo-Yo IR1 test proved to be valid, reliable, and easily available measurement tool of a player's soccer-specific endurance capacity. PMID:21804423

  2. The Solar Anomalous and Magnetospheric Particle Explorer (SAMPEX) yo-yo despin and solar array deployment mechanism

    NASA Technical Reports Server (NTRS)

    Kellogg, James W.

    1993-01-01

    The SAMPEX spacecraft, successfully launched in July 1992, carried a yo-yo despin system and deployable solar arrays. The despin and solar array mechanisms formed an integral system as the yo-yo cables held the solar array release mechanism in place. The SAMPEX design philosophy was to minimize size and weight through the use of a predominantly single string system. The design challenge was to build a system in a limited space, which was reliable with minimal redundancy. This paper covers the design and development of the SAMPEX yo-yo despin and solar array deployment mechanisms. The problems encountered during development and testing will also be discussed.

  3. Competitive-level differences in Yo-Yo intermittent recovery and twelve minute run test performance in soccer referees.

    PubMed

    Castagna, Carlo; Abt, Grant; D'Ottavio, Stefano

    2005-11-01

    The aim of this study was to examine yo-yo intermittent recovery test (Yo-Yo test) and 12-minute run test (12MRT) performances in experienced soccer referees of different competitive levels. Three groups (n = 14 each) of experienced Italian soccer referees officiating in the first (series AB, top-level), third (series C, medium-level), and fourth (series D, low-level) division, were randomly submitted to the 12MRT and the Yo-Yo test during 2 testing sessions, 48-hours apart. 12MRT performances were 3,000 +/- 112 m; 2,894 +/- 99 m; and 2,896 +/- 171 m for top-level, medium-level and low-level referees, respectively (p > 0.05). In the Yo-Yo test, the top-level, medium-level, and low-level referees covered 1,874 +/- 431 m; 1,360 +/- 172 m; and 1,272 +/- 215 m, respectively. The test performances of top-level referees in the Yo-Yo test was significantly different from those scored by medium-level and low-level referees (p < 0.05). After the Yo-Yo test, blood lactate concentrations (BLC) were higher in the medium-level and low-level referees compared with the top-level referees (p < 0.05). The results of the present study show that the Yo-Yo test and not the 12MRT can discriminate endurance performance in experienced elite level soccer referees. With respect to its discriminative and match performance validity, the Yo-Yo test may be considered a relevant field test to assess endurance preparedness for experienced soccer referees and a useful tool in talent selection. PMID:16287348

  4. Embedded Solenoid Inductors for RF CMOS Power Amplifiers Yong-Kyu Yoon, Emery Chen, Mark G. Allen, and Joy Laskar

    E-print Network

    Embedded Solenoid Inductors for RF CMOS Power Amplifiers Yong-Kyu Yoon, Emery Chen, Mark G. Allen with a foundry-fabricated CMOS RF power amplifier, is described. The embedded nature of these inductors allows circuitry, four inductors are post-processed onto a foundry-fabricated RF CMOS power amplifier. DESIGN

  5. Wire-driven Microarchitectural Design Space Exploration Mongkol Ekpanyapong, Sung Kyu Lim, Chinnakrishnan Ballapuram, and Hsien-Hsin S. Lee

    E-print Network

    Lee, Hsien-Hsin "Sean"

    Wire-driven Microarchitectural Design Space Exploration Mongkol Ekpanyapong, Sung Kyu Lim propose an interconnect-driven framework that performs an efficient and effective design space exploration during design space exploration. By increasing the sizes of modules, we may improve the overall

  6. Area-Mura Detection in TFT-LCD Panel* Kyu N. Choi, Jae Y. Lee, and Suk I. Yoo

    E-print Network

    Yoo, SukIn

    Area-Mura Detection in TFT-LCD Panel* Kyu N. Choi, Jae Y. Lee, and Suk I. Yoo School of Computer TFT-LCD generally has the intrinsic non-uniformity due to the variance of the backlight. The region has been evaluated on those TFT-LCD panel samples provided by Samsung Electronics Co., Ltd. Keywords

  7. SIMULTANEOUS DELAY AND POWER OPTIMIZATION IN GLOBAL PLACEMENT Mongkol Ekpanyapong, Karthik Balakrishnan, Vidit Nanda, and Sung Kyu Lim

    E-print Network

    Lim, Sung Kyu

    Balakrishnan, Vidit Nanda, and Sung Kyu Lim School of Electrical and Computer Engineering, Georgia Institute, targeting simultaneous delay and power optimization. We propose GEO-P for power optimization and GEO tradeoff. In GEO- PD, we use retiming based timing analysis and visible power analysis to identify timing

  8. Relationships between the yo-yo intermittent recovery test and anaerobic performance tests in adolescent handball players.

    PubMed

    Hermassi, Souhail; Aouadi, Ridha; Khalifa, Riadh; van den Tillaar, Roland; Shephard, Roy J; Chelly, Mohamed Souhaiel

    2015-03-29

    The aim of the present study was to investigate relationships between a performance index derived from the Yo-Yo Intermittent Recovery Test level 1 (Yo-Yo IR1) and other measures of physical performance and skill in handball players. The other measures considered included peak muscular power of the lower limbs (Wpeak), jumping ability (squat and counter-movement jumps (SJ, CMJ), a handball skill test and the average sprinting velocities over the first step (VS) and the first 5 m (V5m). Test scores for 25 male national-level adolescent players (age: 17.2 ± 0.7 years) averaged 4.83 ± 0.34 m·s(-1) (maximal velocity reached at the Yo-Yo IR1); 917 ± 105 Watt, 12.7 ± 3 W·kg(-1) (Wpeak); 3.41 ± 0.5 m·s(-1) and 6.03 ± 0.6 m·s(-1) (sprint velocities for Vs and V5m respectively) and 10.3 ± 1 s (handball skill test). Yo-Yo IR1 test scores showed statistically significant correlations with all of the variables examined: Wpeak (W and W·kg(-1)) r = 0.80 and 0.65, respectively, p?0.001); sprinting velocities (r = 0.73 and 0.71 for VS and V5m respectively; p?0.001); jumping performance (SJ: r = 0.60, p?0.001; CMJ: r= 0.66, p?0.001) and the handball skill test (r = 0.71; p?0.001). We concluded that the Yo-Yo test score showed a sufficient correlation with other potential means of assessing handball players, and that intra-individual changes of Yo-Yo IR1 score could provide a useful composite index of the response to training or rehabilitation, although correlations lack sufficient precision to help in players' selection. PMID:25964822

  9. Quantum Local Quench, AdS/BCFT and Yo-Yo String

    E-print Network

    Astaneh, Amin Faraji

    2014-01-01

    We propose a holographic model for local quench in 1+1 dimensional Conformal Field Theory (CFT). The local quench is produced by joining two identical CFT's on semi-infinite lines. When these theories have a zero boundary entropy, we use the AdS/Boundary CFT proposal to describe this process in terms of bulk physics. Boundaries of the original CFT's are extended in AdS as dynamical surfaces. In our holographic picture these surfaces detach from the boundary and form a closed folded string which can propagate in the bulk. The dynamics of this string is governed by the tensionless Yo-Yo string solution and its subsequent evolution determines the time dependence after quench. We use this model to calculate holographic Entanglement Entropy (EE) of an interval as a function of time. We propose how the falling string deforms Ryu-Takayanagi's curves. Using the deformed curves we calculate EE and find complete agreement with field theory results.

  10. Quantum Local Quench, AdS/BCFT and Yo-Yo String

    E-print Network

    Amin Faraji Astaneh; Amir Esmaeil Mosaffa

    2015-05-04

    We propose a holographic model for local quench in 1+1 dimensional Conformal Field Theory (CFT). The local quench is produced by joining two identical CFT's on semi-infinite lines. When these theories have a zero boundary entropy, we use the AdS/Boundary CFT proposal to describe this process in terms of bulk physics. Boundaries of the original CFT's are extended in AdS as dynamical surfaces. In our holographic picture these surfaces detach from the boundary and form a closed folded string which can propagate in the bulk. The dynamics of this string is governed by the tensionless Yo-Yo string solution and its subsequent evolution determines the time dependence after quench. We use this model to calculate holographic Entanglement Entropy (EE) of an interval as a function of time. We propose how the falling string deforms Ryu-Takayanagi's curves. Using the deformed curves we calculate EE and find complete agreement with field theory results.

  11. The molecular yo-yo method: Live jump detection improves throughput of single-molecule force spectroscopy for out-of-equilibrium transitions

    E-print Network

    Regan, Lynne

    The molecular yo-yo method: Live jump detection improves throughput of single- molecule force detection and force-clamp algorithm that intelligently adjusts and maintains the force on a single molecule, 085119 (2013) The molecular yo-yo method: Live jump detection improves throughput of single-molecule

  12. Yo-yo subduction recorded by accessory minerals in the Italian Western Alps

    NASA Astrophysics Data System (ADS)

    Rubatto, Daniela; Regis, Daniele; Hermann, Jörg; Boston, Katherine; Engi, Martin; Beltrando, Marco; McAlpine, Sarlae R. B.

    2011-05-01

    High-pressure metamorphic rocks form during subduction of Earth's crust to mantle depths at convergent plate margins. Their exposure at the surface of Earth today provides a record of the subduction zone process. In general, such metamorphic rocks record only a single cycle of subduction and exhumation, yet tectonic models suggest that individual rock units should undergo multiple subduction-exhumation cycles. Here we investigate the microstructure and chemical composition of metamorphic minerals in high-pressure rocks exposed in the Sesia zone in the Italian Western Alps. We find that the minerals white mica, garnet, allanite and zircon each exhibit multiple generations of mineral overgrowths. In particular, two generations of white mica with high-silicon content, indicative of formation at high pressure, are separated by an overgrowth with low-silicon content that formed during exhumation at low pressures. Furthermore, the trace-element signatures of distinct zones within zircon and allanite also reveal two episodes of high-pressure metamorphism, separated by a period of rapid exhumation. We use uranium-lead dating of zircon and allanite overgrowths to constrain the timing of this subduction-exhumation-subduction cycle to 79-65Myr ago. We conclude that slices of the Sesia zone crust experienced two cycles of burial to mantle depths in less than 20million years. The yo-yo subduction occurred during oblique convergence between the African and European plates, which involved a continental margin.

  13. Fiber optic probe of free electron evanescent fields in the optical frequency range Jin-Kyu So, Kevin F. MacDonald, and Nikolay I. Zheludev

    E-print Network

    Zheludev, Nikolay

    Fiber optic probe of free electron evanescent fields in the optical frequency range Jin-Kyu So fabrication of bent near-field optical fiber probes by electric arc heating Rev. Sci. Instrum. 69, 3843 (1998 of thermal evaporation conditions used in coating aluminum on near-field fiber-optic probes Rev. Sci. Instrum

  14. SURFACE-MICROMACHINED MILLIMETER-WAVE ANTENNAS Yong-Kyu Yoon, Bo Pan, John Papapolymerou, Manos Tentzeris, and Mark G. Allen

    E-print Network

    -wave antennas such as microstrip antennas or printed-circuit patch antennas are widely used due to their ease antenna. MONOPOLE-DRIVEN YAGI-UDA ANTENNA A 3-D W-band surface micromachined monopole antenna has beenSURFACE-MICROMACHINED MILLIMETER-WAVE ANTENNAS Yong-Kyu Yoon, Bo Pan, John Papapolymerou, Manos

  15. A Study on the Impact of Nano-Scale TSVs on 3D Dae Hyun Kim, Suyoun Kim, and Sung Kyu Lim

    E-print Network

    Lim, Sung Kyu

    on whether these nano-scale TSVs used in future device/wire technologies will deliver significant improvementA Study on the Impact of Nano-Scale TSVs on 3D IC Designs Dae Hyun Kim, Suyoun Kim, and Sung Kyu Lim School of Electrical and Computer Engineering Georgia Institute of Technology Email: daehyun

  16. Agent Program Planning Information S! Yo Puedo Controlar Mi Diabetes!

    E-print Network

    Agent Program Planning Information Sí! ¡Yo Puedo Controlar Mi Diabetes! (A culturally appropriate type 2 diabetes self-management program for Hispanic/Latino, Spanish-speaking audiences) Relevance · Estimates from the Texas Health and Human Services Commission indicate that in 2011 diabetes cost Texas more

  17. Evaluation of the Yo Puedo Summer Program--1985-86.

    ERIC Educational Resources Information Center

    Cognetta, Randall A.; Goodwine, Jean

    Designed for migrant students in grades 9 through 12, the Yo Puedo Program attempted to motivate students to remain in and graduate from high school and to continue their education at the university level. The 5-week summer program, conducted at the University of California at Santa Cruz, provided an academic setting and a positive learning…

  18. GRASP WITH PATH-RELINKING FOR NETWORK MIGRATION SCHEDULING

    E-print Network

    between nodes in the same network is routed in that network. Suppose that node yo in the old network is migrated to node yn in the new network. Let the capacity of arc (xo,yo) be co. Traffic between node xo is migrated, one or more temporary arcs may need to be set up since yo may be adjacent to more than one still

  19. Synthesis, crystal structure, photodegradation kinetics and photocatalytic activity of novel photocatalyst ZnBiYO4.

    PubMed

    Cui, Yanbing; Luan, Jingfei

    2015-03-01

    ZnBiYO4 was synthesized by a solid-state reaction method for the first time. The structural and photocatalytic properties of ZnBiYO4 were characterized by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy and UV-Vis diffuse reflectance. ZnBiYO4 crystallized with a tetragonal spinel structure with space group I41/A. The lattice parameters for ZnBiYO4 were a=b=11.176479Å and c=10.014323Å. The band gap of ZnBiYO4 was estimated to be 1.58eV. The photocatalytic activity of ZnBiYO4 was assessed by photodegradation of methyl orange under visible light irradiation. The results showed that ZnBiYO4 had higher catalytic activity compared with N-doped TiO2 under the same experimental conditions using visible light irradiation. The photocatalytic degradation of methyl orange with ZnBiYO4 or N-doped TiO2 as catalyst followed first-order reaction kinetics, and the first-order rate constant was 0.01575 and 0.00416min(-1) for ZnBiYO4 and N-doped TiO2, respectively. After visible light irradiation for 220min with ZnBiYO4 as catalyst, complete removal and mineralization of methyl orange were observed. The reduction of total organic carbon, formation of inorganic products, SO4(2-) and NO3(-), and evolution of CO2 revealed the continuous mineralization of methyl orange during the photocatalytic process. The intermediate products were identified using liquid chromatography-mass spectrometry. The ZnBiYO4/(visible light) photocatalysis system was found to be suitable for textile industry wastewater treatment and could be used to solve other environmental chemical pollution problems. PMID:25766013

  20. An ab initio study of the low-lying electronic states of YO2 and Franck-Condon simulation of the first photodetachment band of YO2(-).

    PubMed

    Lee, Edmond P F; Dyke, John M; Mok, Daniel K W; Chau, Foo-tim

    2008-05-15

    A variety of density functional theory and ab initio methods, including B3LYP, B98, BP86, CASSCF, CASSCF/RS2, CASSCF/MRCI, BD, BD(T), and CCSD(T), with ECP basis sets of up to the quintuple-zeta quality for Y, have been employed to study the X(2)B2 state of YO2 and the X(1)A1 state of YO2(-). Providing that the Y 4s(2)4p(6) outer-core electrons are included in the correlation treatment, the RCCSD(T) method gives the most consistent results and is concluded to be the most reliable and practical computational method for YO2 and YO2(-). In addition, RCCSD(T) potential energy functions (PEFs) of the X(2)B2 state of YO2 and the X(1)A1 state of YO2(-) were computed, employing the ECP28MDF_aug-cc-pwCVTZ and aug-cc-pVTZ basis sets for Y and O, respectively. Franck-Condon factors, which include allowance for Duschinsky rotation and anharmonicity, were calculated using the computed RCCSD(T) PEFs and were used to simulate the first photodetachment band of YO2(-). The simulated spectrum matches very well with the corresponding experimental 355 nm photodetachment spectrum of Wu, H.; Wang, L.-S. J. Phys. Chem. A 1998, 102, 9129, confirming the reliability of the RCCSD(T) PEFs used. Further calculations on low-lying electronic states of YO2 gave T(e)'s and T(vert)'s of the A(2)A1, B(2)B1, and C(2)A2 states of YO2, as well as EAs and VDEs to these states from the X(1)A1 state of YO2(-). On the basis of the ab initio VDEs obtained in the present study, previous assignments of the second and third photodetachment bands of YO2(-) have been revised. PMID:18422292

  1. The Yo-Yo intermittent recovery test level 1 is reliable in young high-level soccer players.

    PubMed

    Deprez, D; Fransen, J; Lenoir, M; Philippaerts, Rm; Vaeyens, R

    2015-03-01

    The aim of the study was to investigate test reliability of the Yo-Yo intermittent recovery test level 1 (YYIR1) in 36 high-level youth soccer players, aged between 13 and 18 years. Players were divided into three age groups (U15, U17 and U19) and completed three YYIR1 in three consecutive weeks. Pairwise comparisons were used to investigate test reliability (for distances and heart rate responses) using technical error (TE), coefficient of variation (CV), intra-class correlation (ICC) and limits of agreement (LOA) with Bland-Altman plots. The mean YYIR1 distances for the U15, U17 and U19 groups were 2024 ± 470 m, 2404 ± 347 m and 2547 ± 337 m, respectively. The results revealed that the TEs varied between 74 and 172 m, CVs between 3.0 and 7.5%, and ICCs between 0.87 and 0.95 across all age groups for the YYIR1 distance. For heart rate responses, the TEs varied between 1 and 6 bpm, CVs between 0.7 and 4.8%, and ICCs between 0.73 and 0.97. The small ratio LOA revealed that any two YYIR1 performances in one week will not differ by more than 9 to 28% due to measurement error. In summary, the YYIR1 performance and the physiological responses have proven to be highly reliable in a sample of Belgian high-level youth soccer players, aged between 13 and 18 years. The demonstrated high level of intermittent endurance capacity in all age groups may be used for comparison of other prospective young soccer players. PMID:25729152

  2. The Yo-Yo intermittent recovery test level 1 is reliable in young high-level soccer players

    PubMed Central

    Fransen, J; Lenoir, M; Philippaerts, RM; Vaeyens, R

    2014-01-01

    The aim of the study was to investigate test reliability of the Yo-Yo intermittent recovery test level 1 (YYIR1) in 36 high-level youth soccer players, aged between 13 and 18 years. Players were divided into three age groups (U15, U17 and U19) and completed three YYIR1 in three consecutive weeks. Pairwise comparisons were used to investigate test reliability (for distances and heart rate responses) using technical error (TE), coefficient of variation (CV), intra-class correlation (ICC) and limits of agreement (LOA) with Bland-Altman plots. The mean YYIR1 distances for the U15, U17 and U19 groups were 2024 ± 470 m, 2404 ± 347 m and 2547 ± 337 m, respectively. The results revealed that the TEs varied between 74 and 172 m, CVs between 3.0 and 7.5%, and ICCs between 0.87 and 0.95 across all age groups for the YYIR1 distance. For heart rate responses, the TEs varied between 1 and 6 bpm, CVs between 0.7 and 4.8%, and ICCs between 0.73 and 0.97. The small ratio LOA revealed that any two YYIR1 performances in one week will not differ by more than 9 to 28% due to measurement error. In summary, the YYIR1 performance and the physiological responses have proven to be highly reliable in a sample of Belgian high-level youth soccer players, aged between 13 and 18 years. The demonstrated high level of intermittent endurance capacity in all age groups may be used for comparison of other prospective young soccer players. PMID:25729152

  3. Temperate carbonate debrites and short-lived earliest Miocene yo-yo tectonics, eastern Taranaki Basin margin, New Zealand

    NASA Astrophysics Data System (ADS)

    Hood, Steven D.; Nelson, Campbell S.

    2012-03-01

    This study examines two unconformity-bound earliest Miocene temperate shallow-marine limestones at remote Gibson Beach, western North Island, on the eastern margin of Taranaki Basin, New Zealand's only producing hydrocarbon province. The local geology comprises an upper limestone of up to 6 m of spectacular conglomeratic limestone (rudstone; Papakura Limestone) whose pebble- to boulder-sized clasts were derived from cannibalisation of the lower skeletal limestone (bryomol grainstone; Otorohanga Limestone). Multiple lines of evidence require the Otorohanga Limestone to have been well indurated before erosion and clast generation. Cementation occurred from pressure dissolution of calcitic skeletons at burial depths of probably 400 m or more. Subsequent uplift led to local subaerial exposure and karstification of a fault-block cliffed coastline where physical erosion sourced talus limestone debris onto adjacent high-energy pocket beaches. Storm and/or seismic events periodically triggered mass flows of the limestone clasts offshore onto the contemporary mixed siliciclastic-carbonate shelf as channelised carbonate debrites. Lithification of these Papakura Limestone debrites occurred via pressure dissolution, and required a second burial episode. Karst pinnacles preserved on the eroded upper surface of the Papakura Limestone demand uplift again and erosion in a subaerial setting, before subsequent deep burial by Early Miocene siliciclastic shelf sand and turbidite deposits. Strontium isotope dating of brachiopod fossils suggests the two postulated burial-uplift cycles, involving movements up to 400 ± 100 m, occurred very rapidly within several 100 kyr. Speculative drivers of the yo-yo tectonic events are earliest Miocene movements on the nearby major Taranaki Fault thrust in association with regional changes in subduction tectonics at the Australian-Pacific plate boundary, along with pulsed emplacement of obducted gravity slide deposits (Northland Allochthon) onto northern North Island. The two limestones record a previously undocumented degree of eastern Taranaki Basin margin tectonic mobility relevant to a fuller appreciation of petroleum system development in that basin.

  4. Physics and Physical Oceanography Data Report 2000-2 Tow-Yo and Temperature Data from Trinity Bay,

    E-print Network

    deYoung, Brad

    Physics and Physical Oceanography Data Report 2000-2 Tow-Yo and Temperature Data from Trinity Bay). ...................................................................................... 6 Figure 3: Conductivity measurements from Up (red) cast from Tow-Yo compared to down cast (blue. .............. 7 Figure 4: Temperature measurements from Up (red) cast from Tow-Yo compared to down cast (blue

  5. Effect of YO sub 1. 5 dopant on unit-cell parameter of ZrO sub 2 at low contents of YO sub 1. 5

    SciTech Connect

    Toraya, H. (Ceramic Engineering Research Lab., Nagoya Inst. of Technology, Asahigaoka, Taijimi 507 (JP))

    1989-04-01

    This paper reports the effect of YO{sub 1.5} dopant on unit-cell parameters of ZrO{sub 2} (YO{sub 1.5} = 0 to 14.6 mol %) examined by the X-ray whole-powder- pattern decomposition technique. The unit cell of monoclinic ZrO{sub 2} has the largest expansion along the direction perpendicular to (100). The rate of increase of the unit- cell volume of monoclinic ZrO{sub 2} with YO{sub 1.5} content is greater than that of tetragonal ZrO{sub 2} and comparable to that of cubic ZrO{sub 2}.

  6. Predicting a vehicle's attitude response to a single yo despin. [for sounding rocket launch application

    NASA Technical Reports Server (NTRS)

    Bensimon, M.

    1976-01-01

    The method developed for analysis of single yo despin systems is a two step process. The first step utilizes the despin equations for a yo or yo-yo system to compute the cable tension force and its point of application on the body throughout the despin process. The second step considers the actual body configuration and treats the force just discussed as a prescribed external force acting on the surface of the body at the physical location of the despin system. The resulting vehicle coning angle is first computed using a digital computer program for a body with no initial coning prior to despin. Closed form solutions which utilize the previous results are then used to treat the effects of initial conditions.

  7. Anti-Yo-Associated Paraneoplastic Cerebellar Degeneration in a Man with Adenocarcinoma of the Gastroesophageal Junction

    Microsoft Academic Search

    J. D. Debes; S. M. Lagarde; E. Hulsenboom; P. A. E. Sillevis Smitt; F. J. W. ten Kate; G. A. Sulter; J. J. B. van Lanschot

    2007-01-01

    Anti-Yo-associated paraneoplastic cerebellar degeneration is a cancer-related syndrome affecting the nervous system. This syndrome occurs almost exclusively in middle-aged women with gynecological cancers and it is rarerly found in patients with other types of cancer or in males. In this report we describe a male patient adenocarcinoma of the gastroesophageal junction and PCD with anti-Yo antibodies. To our knowledge, this

  8. Yo Puedo - a conditional cash transfer and life skills intervention to promote adolescent sexual health: results of a randomized feasibility study in San Francisco

    PubMed Central

    Minnis, Alexandra M.; vanDommelen-Gonzalez, Evan; Luecke, Ellen; Dow, William; Bautista-Arredondo, Sergio; Padian, Nancy S.

    2014-01-01

    Purpose We designed and evaluated for feasibility an intervention - Yo Puedo - that addresses social network influences and socioeconomic opportunities in a neighborhood with substantial gang exposure and early childbearing. Methods Yo Puedo combined conditional cash transfers for completion of educational and reproductive health wellness goals with life skills sessions, and targeted youth 16 to 21 years old and same-aged members of their social network. We conducted a 2-arm study with social networks randomized to the intervention or a standard services control arm. We evaluated intervention uptake, adherence and safety; and assessed evidence of effects on behavioral outcomes associated with unintended pregnancy and STI risk. Results Seventy-two social networks comprised of 162 youth enrolled, with 92% retention over six months. Seventy-two percent of youth randomized to the intervention participated in intervention activities: 53% received at least one CCT payment; and 66% came to at least one life skills session. We found no evidence that cash payments financed illicit or high-risk behavior. At six months, intervention participants, compared to controls, had a lower odds of hanging out on the street frequently (OR = 0.54, p = 0.10) and a lower odds of reporting their close friends had been incarcerated (OR = 0.6, p=0.12). They reported less regular alcohol use (OR = 0.54, p=0.04) and a lower odds of having sex (OR = 0.50, p = 0.04). Conclusions The feasibility evaluation of Yo Puedo demonstrated its promise; a larger evaluation of effects on pregnancy and sustained behavioral changes is warranted. PMID:24518532

  9. Synthesis and characterization of oxygen-rich delafossite CuYO 2+ x —Application to H 2photo production

    Microsoft Academic Search

    M. Younsi; S. Saadi; A. Bouguelia; A. Aider; M. Trari

    2007-01-01

    Here we report the synthesis and photo electrochemical properties of super oxides CuYO2.50 and CuYO2.25 prepared from the delafossite CuYO2, respectively, by thermal oxidation at 380°C under O2-flow and soft chemistry in NaBrO solution (5N). Their applications as catalysts for H2 evolution upon visible light were investigated. The oxygen insertion was accompanied by partial oxidation of Cu+. For CuYO2.25, the

  10. Journul of Fusion Energy. Yo/. 5. No. 2. 1986 Introduction to Panel Discussions

    E-print Network

    Journul of Fusion Energy. Yo/. 5. No. 2. 1986 -- Introduction to Panel Discussions Whither Fusion Research? Robert L. Hirsch' . An unnamed former fusion program director retired and felt he needed some friend appeared before the major monk for his annual two words, which were, " Room cold." The monk nodded

  11. Build Brand yoU SM Strategies for Personal Brand Development

    E-print Network

    Lin, Xiaodong

    Appearance: Adheres to company/industry dress code Attitude: Optimistic Performance: High Achiever, Results brand is a conversion of these four areas: Communication Attitude Appearance Performance Brand yo"U" SM opportunities Employers & employees will leave each other for better opportunities Many openings are knowledge

  12. Online Multiple Palindrome Pattern Matching , Hwee Kim and Yo-Sub Han

    E-print Network

    Han, Yo-Sub

    Online Multiple Palindrome Pattern Matching , Hwee Kim and Yo-Sub Han Department of Computer,emmous}@cs.yonsei.ac.kr Abstract. A palindrome is a string that reads the same forward and backward. We say that two strings palindrome. Given a text T of length n and a set of patterns P1, . . . , Pk, we study the online multiple

  13. Restricted IgG1 subclass of anti-Yo antibodies in paraneoplastic cerebellar degeneration

    Microsoft Academic Search

    Elisabeth Amyes; John Curnow; Zornitza Stark; Louise Corlett; Ian Sutton; Angela Vincent

    2001-01-01

    Paraneoplastic cerebellar degeneration (PCD) occurs as a non-metastatic manifestation of cancer in a small proportion of patients with certain breast or gynaecological tumours, and is characterised by widespread Purkinje cell loss. Antibodies against a Purkinje cell cytoplasmic antigen, called Yo, that is expressed by the tumours, are present in the majority of these patients, but the pathogenic role of the

  14. An Overview of Language Preservation at Ohi: Yo'., the Seneca Allegany Territory

    ERIC Educational Resources Information Center

    Borgia, Melissa E.

    2010-01-01

    This project seeks to discover and disseminate information pertaining to the language practices and values of a selected group of "Onodowa'ga:'" (Seneca) at "Ohi:yo'", or the Allegany Territory, in upstate New York. The goal is to find where the current practices and values are situated in the larger picture of Seneca preservation as well as the…

  15. Platero como el primer paso liteario (Platero y Yo: A Student's Introduction to Literary Analysis).

    ERIC Educational Resources Information Center

    Ohrtman, Dennis W.

    This instructional guide is to be used by teachers in the instruction of "Platero y Yo," written by Juan Ramon Jimenez, one of Spain's foremost poets. A systematic study is provided of movement throughout the text, by analyzing verb tenses, to help novice Spanish literature students grasp the scholastic and psychological interpretations of poetic…

  16. Propeller study. Part 3: Experimental determination of thrust and torque on the YO-3A aircraft

    NASA Technical Reports Server (NTRS)

    Ormsbee, A. I.; Siddiqi, S. A.; Sivier, K. R.

    1977-01-01

    Instrumentation and procedures for obtaining in-flight measurements of the torque and thrust of a propeller mounted on a YO-3A aircraft are described. Problems encountered in the study are discussed and methods for eliminating these difficulties are suggested.

  17. Name: Bordonaba Question: In a 45 y/o AA female with coagulation problems, will the monitoring of the IRN value before

    E-print Network

    Goldman, Steven A.

    Name: Bordonaba Question: In a 45 y/o AA female with coagulation problems, will the monitoring, comparison, outcome) P: 45 y/o African American female with coagulation pathology needs to have some teeth

  18. The molecular yo-yo method: Live jump detection improves throughput of single-molecule force spectroscopy for out-of-equilibrium transitions

    NASA Astrophysics Data System (ADS)

    Mack, A. H.; Schlingman, D. J.; Kamenetska, M.; Collins, R.; Regan, L.; Mochrie, S. G. J.

    2013-08-01

    By monitoring multiple molecular transitions, force-clamp, and trap-position-clamp methods have led to precise determinations of the free energies and free energy landscapes for molecular states populated in equilibrium at the same or similar forces. Here, we present a powerful new elaboration of the force-clamp and force-jump methods, applicable to transitions far from equilibrium. Specifically, we have implemented a live jump detection and force-clamp algorithm that intelligently adjusts and maintains the force on a single molecule in response to the measured state of that molecule. We are able to collect hundreds of individual molecular transitions at different forces, many times faster than previously, permitting us to accurately determine force-dependent lifetime distributions and reaction rates. Application of our method to unwinding and rewinding the nucleosome inner turn, using optical tweezers reveals experimental lifetime distributions that comprise a statistically meaningful number of transitions, and that are accurately single exponential. These measurements significantly reduce the error in the previously measured rates, and demonstrate the existence of a single, dominant free energy barrier at each force studied. A key benefit of the molecular yo-yo method for nucleosomes is that it reduces as far as possible the time spent in the tangentially bound state, which minimizes the loss of nucleosomes by dissociation.

  19. Development of a new tow-yo instrument to observe detailed river plume structures

    NASA Astrophysics Data System (ADS)

    Masunaga, E.; Yamazaki, H.; Nagai, T.

    2012-12-01

    Field observations in coastal and estuary area are important factors in revealing physical and biological structures. However, detailed fine scale structures are difficult to observe in situ due to lack of a suitable instrument. We have developed a new Tow-Yo instrument, Yoing Ocean Data Acquisition Profiler (YODA) to observe the small scale features of coastal waters directly. The high-resolution data obtained from YODA showed fine scale complicated internal wave structures and patchily distribution of phytoplankton along a river plume (Fig.1). We have also developed a scheme to estimate the rate of turbulent kinetic energy dissipation ? from dC/dz signals obtained from YODA. We will present various observed fine scale events. Also we present that a critical angle theory for low frequency internal wave is consistent with our observation.; Fig.1 Salinity and fluorescence distribution around the river mouth obtained from YODA.

  20. Thermodynamic calculation of the ZrO sub 2 -YO sub 1. 5 -MgO system

    SciTech Connect

    Yong, D.; Zhanpeng, J.; Peiyun, H. (Dept. of Materials Science and Engineering, Central South Univ. of Technology, Changsha, Hunan 410083 (CN))

    1991-09-01

    This paper reports on a thermodynamic evaluation of the ZrO{sub 2}-MgO system that has been developed and combined with previous assessments of the ZrO{sub 2}-YO{sub 1.5} and YO{sub 1.5}-MgO systems to describe the ZrO{sub 2}-YO{sub 1.5}-MgO system by means of Bonnier's equation. The calculated results are shown by isothermal and vertical sections, a projection of the liquidus surfaces, and the reaction scheme. Comparisons between calculated and experimental diagrams demonstrate that the calculations satisfactorily account for most of the available experimental data.

  1. Yo, Mister!

    ERIC Educational Resources Information Center

    Rodriguez, Louie F.

    2005-01-01

    The strong association between student-adult relationships and student retention, achievement and aspirations goes largely unrecognized and such relationships are seen as secondary to test scores, policy and budgets. However, it is not the case at Community Academy, an alternative public high school in Boston, where teachers endeavor to build…

  2. Drag of Prestone and Oil Radiators on the YO-31A Airplane

    NASA Technical Reports Server (NTRS)

    Defrance, S J

    1935-01-01

    At the request of the Army Air Corps tests were conducted on a mock-up of the YO-31A airplane to determine the drag of the prestone and oil radiators. The drag of the airplane was determined with both radiators exposed on the lower surface of the fuselage; with each radiator exposed; and with no radiators. The results show that at 120 m.p.h the oil radiator accounted for 2.8 percent of the drag of the complete airplane; the prestone radiator 8.3 percent; and both radiators together, 11.8 percent.

  3. Theoretical Analysis of the Spin Density Wave Transition in V_2-yO_3

    NASA Astrophysics Data System (ADS)

    Wolenski, T.; Grodzicki, M.; Appel, J.

    1997-03-01

    Recent observations of a spin density wave (SDW) transition from a paramagnetic metal to an antiferromagnetic metal ground state in doped V_2-yO3 in nuclear magnetic resonance (NMR)(S. Langenbuch at al.), Phys. Rev. B 53, R472 (1996). and neutron scattering(W. Bao at al.), Phys. Rev. B 54, R3726 (1996). experiments have led to the present investigation. These observations are particularly intriguing since the undoped V_2O3 is considered to be a classical example of the Mott-Hubbard metal-insulator transition. We examine the SDW transition in V_2-yO3 theoretically. The point of departure is a Slater-Koster band structure calculation based on recent APW calculations(L.F. Mattheiss, J. Phys.: Cond. Matt. 6), 6477 (1994).. We present preliminary results on the spin structure and the doping dependence of the SDW in the antiferromagnetic metal, based on the Slater-Koster bandstructure near the Fermi energy.

  4. A new tow-yo instrument to observe high-resolution coastal phenomena

    NASA Astrophysics Data System (ADS)

    Masunaga, Eiji; Yamazaki, Hidekatsu

    2014-01-01

    Field observations in coastal and estuarine regions are important for studying physical and biological features. Recent studies have presented fine-scale physical features from numerical models and acoustic surveys. However, high spatial resolution data of physical structures are difficult to obtain, since the conventional CTD survey requires a stop-and-measure ship operation. To solve this issue, we have developed a new, portable tow-yo instrument, Yoing Ocean Data Acquisition Profiler (YODA Profiler), that continuously observes many vertical profiles of the fine-scale features in coastal regions. Using the YODA Profiler, we were able to rapidly obtain high-resolution data in a shallow estuary. The results showed fine-scale complicated internal wave features, upslope propagating fronts and a patchy distribution of phytoplankton. These observations are consistent with recent numerical models and acoustic surveys, as well as with the critical angle theory for internal wave reflections along a bottom slope. We have also developed a statistical technique to estimate the rate of turbulent kinetic energy dissipation, ?, from the variance of dC/dz data. Using this technique we were able to estimate the turbulent kinetic energy dissipation rate associated with river outflow and internal waves in the river mouth.

  5. In-flight acoustic testing techniques using the YO-3A Acoustic Research Aircraft

    NASA Technical Reports Server (NTRS)

    Cross, J. L.; Watts, M. E.

    1984-01-01

    This report discusses the flight testing techniques and equipment employed during air-to-air acoustic testing of helicopters at Ames Research Center. The in flight measurement technique used enables acoustic data to be obtained without the limitations of anechoic chambers or the multitude of variables encountered in ground based flyover testing. The air-to-air testing is made possible by the NASA YO-3A Acoustic Research Aircraft. This "Quiet Aircraft' is an acoustically instrumented version of a quiet observation aircraft manufactured for the military. To date, tests with the following aircraft have been conducted: YO-3A background noise; Hughes 500D; Hughes AH-64; Bell AH-1S; Bell AH-1G. Several system upgrades are being designed and implemented to improve the quality of data. This report will discuss not only the equipment involved and aircraft tested, but also the techniques used in these tests. In particular, formation flying position locations, and the test matrices will be discussed. Examples of data taken will also be presented.

  6. In-flight acoustic testing techniques using the YO-3A acoustic research aircraft

    NASA Technical Reports Server (NTRS)

    Cross, J. L.; Watts, M. E.

    1983-01-01

    This report discusses the flight testing techniques and equipment employed during air-to-air acoustic testing of helicopters at Ames Research Center. The in-flight measurement technique used enables acoustic data to be obtained without the limitations of anechoic chambers or the multitude of variables encountered in ground based flyover testing. The air-to-air testing is made possible by the NASA YO-3A Acoustic Research Aircraft. This 'Quiet Aircraft' is an acoustically instrumented version of a quiet observation aircraft manufactured for the military. To date, tests with the following aircraft have been conducted: YO-3A background noise; Hughes 500D; Hughes AH-64; Bell AH-1S; Bell AH-1G. Several system upgrades are being designed and implemented to improve the quality of data. This report will discuss not only the equipment involved and aircraft tested, but also the techniques used in these tests. In particular, formation flying, position locations, and the test matrices will be discussed. Examples of data taken will also be presented.

  7. Calculation of phase diagrams for the YO/sub 1. 5/-BaO-CuO/sub x/ system

    SciTech Connect

    Lee, B.J.; Lee, D.N.

    1989-02-01

    Thermodynamic data for YO/sub 1.5/-BaO, BaO-CuO/sub x/, and YO/sub 1.5/-CuO/sub x/ binary systems from experimental phase diagram data. The equilibrium liquidus surface and the isothermal sections of the ternary system at 900/sup 0/, 925/sup 0/, 950/sup 0/, 975/sup 0/, and 1000 /sup 0/C were calculated. The isopleths containing YBa/sub 2/Cu/sub 3/O/sub 7-/delta// were also calculated.

  8. Goal-Based Safety Standards: Opportunities and Challenges Tim Kelly, University of York, Heslington, York, YO10 5DD UK

    E-print Network

    Kelly, Tim

    ; at minimum we can distinguish process and product standards. In safety, process standards are concernedGoal-Based Safety Standards: Opportunities and Challenges Tim Kelly, University of York, Heslington, University of York, Heslington, York, YO10 5DD UK Safety standards, goal-based standards, safety evidence

  9. Radio PSA script in Spanish Para mi, la diabetes era un monstruo! Yo tema el mal que me pudiera hacer,

    E-print Network

    Radio PSA script in Spanish ¡Para mi, la diabetes era un monstruo! Yo temía el mal que me pudiera hacer, y no sabía cómo controlarlo. Entonces asistí a las clases "Do Well Be Well with Diabetes de que podría vivir bien y sentirme bien con la diabetes. Ahora siento que he dominado a ese monstruo

  10. Automation of System Safety Analysis: Possibilities and Pitfalls Andrew Galloway, University of York, Heslington, York YO10 5DD UK

    E-print Network

    Pumfrey, David

    Automation of System Safety Analysis: Possibilities and Pitfalls Andrew Galloway, University, York YO10 5DD UK Keywords: automated safety analysis, safety analysis tools Abstract As systems become where much of the complexity is found. To counter these problems there is growing demand for automation

  11. Coordination of ScO+ and YO+ by multiple Ar, Kr, and Xe atoms in noble gas matrixes: a matrix isolation infrared spectroscopic and theoretical study.

    PubMed

    Zhao, Yanying; Gong, Yu; Chen, Mohua; Ding, Chuanfan; Zhou, Mingfei

    2005-12-29

    The combination of matrix isolation infrared spectroscopic and quantum chemical calculation results provide strong evidence that scandium and yttrium monoxide cations, ScO+ and YO+, coordinate multiple noble gas atoms in forming noble gas complexes. The results showed that ScO+ coordinates five Ar, Kr, or Xe atoms, and YO+ coordinates six Ar or Kr and five Xe atoms in solid noble gas matrixes. Hence, the ScO+ and YO+ cations trapped in solid noble gas matrixes should be regarded as the [ScO(Ng)5]+ (Ng = Ar, Kr, or Xe), [YO(Ng)6]+ (Ng = Ar or Kr) or [YO(Xe)5]+ complexes. Experiments with dilute krypton or xenon in argon or krypton in xenon produced new IR bands, which are due to the stepwise formation of the [ScO(Ar)(5-n)(Kr)n]+, [ScO(Kr)(5-n)(Xe)n]+ (n = 1-5), [YO(Ar)(6-n)(Kr)n]+ (n = 1-6), and [YO(Ar)(6-n)(Xe)n]+ (n = 1-4) complexes. PMID:16366626

  12. Toward autonomy in love and work: situating the film "Yo, también" within the political project of disability studies.

    PubMed

    Fraser, Benjamin

    2011-01-01

    This essay looks at the representation of disability in the recent Spanish film "Yo, también" through the lens of disability studies, understood as a political project. The film's portrayal of a character who is, like the actor who plays him, Europe's first university graduate with Down syndrome, is unique. Moreover, "Yo, también" provides the opportunity to assess the state of the struggle for rights for persons with disabilities both in the film's narrative arc and also in the wider Spanish (and global) society. Among other sources, specific articles of the United Nations's recent Convention on the Rights of People with Disabilities are incorporated into the essay. Both essay and film coincide in emphasizing the need to grant disabled populations greater autonomy in the spheres of love and work. PMID:21898936

  13. The bulk modulus and young's modulus of the superconductor Ba sub 2 Cu sub 3 YO sub 7

    SciTech Connect

    Block, S.; Piermarini, G.J.; Munro, R.G.; Wong-Ng, W. (National Bureau of Standards, Gaithersburg, MD (USA))

    1987-07-01

    The isothermal equation of state of the high temperature superconducting ceramic material Ba{sub 2}Cu{sub 3}YO{sub 7} has been determined by measurements in a diamond anvil pressure cell using an energy dispersive x-ray diffraction method. The orthorhombic unit cell lattice parameters (a = 3.8856 {angstrom}, b = 11.6804 {angstrom}, c = 3.8185 {angstrom}) were found to have compressions of (2.0%, 2.3%, 1.1%) respectively over the pressure range from one atmosphere to 10.6 GPa at room temperature. Subsequent equation of state analysis of the approximately linear compression of the volume determined that the isothermal bulk modulus was 196 {plus minus} 17 GPa. Young's modulus was estimated to be 235 {plus minus} 20 GPa assuming that the Poisson's ratio for Ba{sub 2}Cu{sub 3}YO{sub 7} was 0.3 which is typical of many ceramics.

  14. Electron Trap Energy Distribution in ALD Al2O3, LaAl4Ox, and GdyAl2-yO3 Layers on Silicon

    NASA Astrophysics Data System (ADS)

    Wang, W. C.; Badylevich, M.; Adelmann, C.; Swerts, J.; Kittl, J. A.; Afanas'ev, V. V.

    2012-12-01

    The energy distribution of electron trap density in atomic layer deposited Al2O3, LaAl4Ox and GdyAl2-yO3 insulating layers was studied by using the exhaustive photodepopulation spectroscopy. Upon filling the traps by electron tunneling from Si substrate, a broad energy distribution of trap levels in the energy range 2-4 eV is found in all studied insulators with trap densities in the range of 1012 cm-2eV-1. The incorporation of La and Gd cations reduces the trap density in aluminate layers as compared to Al2O3. Crystallization of the insulator by the post-deposition annealing is found to increase the trap density while the energy distribution remains unchanged. The similar trap spectra in the Al2O3 and La or Gd aluminate layers suggest the common nature of the traps, probably originating from imperfections in the AlOx sub-network.

  15. The Yo me cuido(®) Program: Addressing Breast Cancer Screening and Prevention Among Hispanic Women.

    PubMed

    Davis, Jenna L; Ramos, Roberto; Rivera-Colón, Venessa; Escobar, Myriam; Palencia, Jeannette; Grant, Cathy G; Green, B Lee

    2014-08-01

    Breast cancer is less likely to be diagnosed at the earliest stage in Hispanic/Latino (Hispanic) women compared to non-Hispanic White women, even after accounting for differences in age, socioeconomic status, and method of detection. Moffitt Cancer Center created a comprehensive health education program called Yo me cuido (®) (YMC) to address and reduce breast cancer disparities among Spanish- and English-speaking Hispanic women by providing breast cancer and healthy lifestyles awareness and education, and promoting breast cancer screenings, reminders, and referrals for women 40 years and older. The purpose of this paper is to showcase the innovative approaches and methods to cancer prevention and early detection of the YMC program, and to promote it as an effective tool for improving outcomes in community health education, outreach, and engagement activities with Hispanic populations. Key components of the program include educational workshops, mammogram referrals, and a multimedia campaign. The YMC program is unique because of its approaches in reaching the Hispanic population, such as delivering the program with compassionate services to empower participants to live a healthier lifestyle. Additionally, direct follow-up for mammography screenings is provided by program staff. From 2011 to 2013, YMC has educated 2,226 women and 165 men through 93 workshops. About 684 (52 %) women ages 40 and older have had a screening mammogram within their first year of participating in the program. The YMC program is an innovative cancer education and outreach program that has demonstrated a positive impact on the lives of the Hispanic community in the Tampa Bay region. PMID:25099235

  16. networks

    Microsoft Academic Search

    M. C. Gonzalez; H. J. Herrmann; J. Kertesz; T. Vicsek

    Recently developed concepts and techniques of analyzing complex systems provide new insight into the structure of social networks. Uncovering recurrent preferences and organizational principles in such networks is a key issue to characterize them. We investigate school friendship networks from the Add Health database. Applying threshold analysis, we find that the friendship networks do not form a single connected component

  17. Gas-phase thermochemistry of the group 3 dioxides: ScO 2, YO 2 and LaO 2

    NASA Astrophysics Data System (ADS)

    Clemmer, D. E.; Dalleska, N. F.; Armentrout, P. B.

    1992-03-01

    Gas-phase ScO 2, YO 2, LaO 2 and the singly charged cations of these species are formed in endothermic reactions between MO + (M=Sc, Y, and La) and NO 2 in a guided ion beam mass spectrometer. The cross sections of these reactions are measured as a function of kinetic energy and are interpreted to give the following 0 K bond energies (in eV): D0(OSc?O)=3.95±0.33, D0(OY?O)=4.14±0.22, D0(OLa?O)=4.20±0.33, D0(OSc +?O)=1.72±0.19, D0(OY +?O)=1.76±0.16, and D0(OLa +?O)=0.99±0.31. Values for the MO 2 ionization energies (in eV) are determined to be IE(ScO 2)=8.66±0.20, IE(YO 2)=8.23±0.16 and IE(LaO 2)=8.11±0.35. The differences between these values and estimates in the literature are discussed by considering the nature of the bonding in MO 2 and MO +2.

  18. A comparison between a child-size PMHS and the Hybrid III 6 YO in a sled frontal impact

    PubMed Central

    Lopez-Valdes, Francisco J.; Forman, Jason; Kent, Richard; Bostrom, Ola; Segui-Gomez, Maria

    2009-01-01

    As pediatric PMHS data are extremely limited, evidence of kinematic differences between pediatric ATDs and live humans comes from comparison of laboratory data to field crash data. Despite the existence of regulations intended to prevent head injuries, these remain the most common serious injuries sustained by children in crashes. In this study, nine frontal sled tests using a Hybrid III 6YO and three tests performed with a child-size adult PMHS were compared, with focus on the kinematic responses (especially of the head) and the seatbelt forces generated during the impact. Two different restraint systems (a pretensioning, force-limiting seatbelt, and a non pretensioning force-limiting standard belt) and two different impact speeds (29 km/h and 48 km/h) were compared. Data from the PMHS were scaled using the erect sitting height of a 50th percentile 6YO and both scaled and unscaled data are presented. The ATD predicted correctly the peak values of the scaled displacements of the PMHS, but differences in relevant parameters such as torso angle and resultant acceleration at different locations were found between the dummy and the PMHS. The ATD’s stiffer thoracic spine is hypothesized as a major cause of these differences. PMID:20184847

  19. Physicochemical properties of solid solutions in the system TbO/sub x/-YO/sub 1. 5/

    SciTech Connect

    Glushkova, V.B.; Yusupova, S.G.; Kuznetsov, A.K.; Tikhonov, P.A.; Kravchinskaya, M.V.

    1988-03-20

    There have not been any systematic studies of the properties of solid solutions in the system TbO/sub x/-YO/sub 1.5/ (1.500 less than or equal to x < 2), apart from the work of Wolf and Schwab, who used x-ray phase and iodometric chemical analyses for studying the dependence of the degree of oxidation of terbium on its concentration in solid solutions with yttrium oxide. It was of interest in this connection to study in greater detail the properties of solid solutions in the given system using a combination of methods of physicochemical analysis. The following methods were used: thermogravimetric analysis, high-temperature x-ray diffraction, dilatometry, conductivity measurement with separation of electronic and ionic conductivity components in air, and differential thermal analysis. Their results lead to the conclusion that the character of thermal expansion and the magnitude and type of conductivity of solid solutions in the system TbO/sub x/-YO/sub 1.5/ depend closely on the oxidation state of terbium in the solid solution.

  20. A comparison between a child-size PMHS and the Hybrid III 6 YO in a sled frontal impact.

    PubMed

    Lopez-Valdes, Francisco J; Forman, Jason; Kent, Richard; Bostrom, Ola; Segui-Gomez, Maria

    2009-10-01

    As pediatric PMHS data are extremely limited, evidence of kinematic differences between pediatric ATDs and live humans comes from comparison of laboratory data to field crash data. Despite the existence of regulations intended to prevent head injuries, these remain the most common serious injuries sustained by children in crashes. In this study, nine frontal sled tests using a Hybrid III 6YO and three tests performed with a child-size adult PMHS were compared, with focus on the kinematic responses (especially of the head) and the seatbelt forces generated during the impact. Two different restraint systems (a pretensioning, force-limiting seatbelt, and a non pretensioning force-limiting standard belt) and two different impact speeds (29 km/h and 48 km/h) were compared. Data from the PMHS were scaled using the erect sitting height of a 50th percentile 6YO and both scaled and unscaled data are presented. The ATD predicted correctly the peak values of the scaled displacements of the PMHS, but differences in relevant parameters such as torso angle and resultant acceleration at different locations were found between the dummy and the PMHS. The ATD's stiffer thoracic spine is hypothesized as a major cause of these differences. PMID:20184847

  1. A molecular beam-optical Stark study of the A sup 2. Pi. -- X sup 2. Sigma. band system of YO

    SciTech Connect

    Steimle, T.C.; Shirley, J.E. (Department of Chemistry, Arizona State University, Tempe, Arizona 85287-1604 (US))

    1990-03-15

    The permanent electric dipole moments of yttrium monoxide YO in its {ital X} {sup 2}{Sigma}{sup +}, {ital A} {sup 2}{Pi}{sub 3/2}, and {ital A} {sup 2}{Pi}{sub 1/2} states have been experimentally determined from an analysis of the Stark shifts in the optical spectrum of a molecular beam sample. The determined values are 4.45(7), 3.68(2), and 3.22(8) D, respectively. The results are discussed in terms of bonding models for YO and are compared to recent theoretical predictions.

  2. UW MEDICINE | MEDICAL INforMAtIoN HoW to rEqUEst A Copy of yoUr

    E-print Network

    Borenstein, Elhanan

    UW MEDICINE | MEDICAL INforMAtIoN 06.2013 HoW to rEqUEst A Copy of yoUr UW MEDICINE MEDICAL rECorDs Release of Information for: Harborview Medical Center Northwest Hospital & Medical Center University of Washington Medical Center UW Neighborhood Clinics Hall Health Center Valley Medical Center MEDICAL r

  3. Photoelectron spectroscopy and electronic structure of ScO{sub n}{sup {minus}}(n = 1--4) and YO{sub n}{sup {minus}}(n = 1--5): Strong electron correlation effects in ScO{sup {minus}} and YO{sup {minus}}

    SciTech Connect

    Wu, H.; Wang, L.S. [Washington State Univ., Richland, WA (United States). Dept. of Physics] [Washington State Univ., Richland, WA (United States). Dept. of Physics; [Pacific Northwest National Lab., Richland, WA (United States). William R. Wiley Environmental Molecular Sciences Lab.

    1998-11-12

    A photoelectron spectroscopic study of ScO{sub n}{sup {minus}} (n = 1--4) and YO{sub n}{sup {minus}} (n = 1--5) was carried out at three photon energies: 532, 355, and 266 nm. Vibrationally resolved photoelectron spectra were obtained for ScO{sup {minus}} and YO{sup {minus}}. The electron affinities of both ScO and YO were measured to be identical (1.35 eV) within the experimental accuracy ({+-}0.02 eV). Three low-lying excited states were observed for the monoxides, {Alpha}{prime}{sup 2}{Delta}, {Alpha}{sup 2}{Pi}, and {Beta}{sup 2}{Sigma}{sup +}. The latter two excited states resulted from two-electron detachment, suggesting unusually strong electron correlation (configuration interaction) effects in the ground state of the anions. The excitation energies of the low-lying states were also found to be similar for the two monoxides except that YO has a smaller vibrational frequency and larger spin-orbit splitting. The {Alpha}{prime}{sup 2}{Delta} states of both ScO and YO show very strong photon energy-dependent detachment cross sections. Four similar photoelectron features were observed for the dioxides with those of YO{sub 2}{sup {minus}} having lower binding energies. A second isomer due to an O{sub 2} complex was also observed for Sc and Y. Broad and featureless spectra were observed for the higher oxides. At least two isomers were present for the higher oxides, one with low and one with high binding energies.

  4. Biochemical properties of a novel and highly thermostable bacterial ?-carbonic anhydrase from Sulfurihydrogenibium yellowstonense YO3AOP1.

    PubMed

    Capasso, Clemente; De Luca, Viviana; Carginale, Vincenzo; Cannio, Raffaele; Rossi, Mosè

    2012-12-01

    A new carbonic anhydrase (CA, EC 4.2.1.1) from the thermophilic bacterium Sulfurihydrogenibium yellowstonense YO3AOP1 was identified and characterized. The bacterial carbonic anhydrase gene was expressed in Escherichia coli yielding an active enzyme, which was purified in large amounts. The recombinant protein (SspCA) was found to belong to the ?-CA class and displays esterase activity. The kinetic parameters were determined by using CO(2) and p-nitrophenylacetate (p-NpA) as substrates. The bacterial enzyme presented specific activity comparable to that of bovine carbonic anhydrase (bCA II) but it showed biochemical properties never observed for the mammalian enzyme. The thermophilic enzyme, in fact, was endowed with high thermostability and with unaltered residual activity after prolonged exposure to heat up to 100°C. SspCA and the bovine carbonic anhydrase (bCA II) were immobilized within a polyurethane (PU) foam. The immobilized bacterial enzyme was found to be active and stable at 100°C up to 50 h. PMID:22803664

  5. Positive electrode materials with high operating voltage for lithium batteries: LiCr yMn 2 ? yO 4 (0 ? y ? 1)

    Microsoft Academic Search

    C. Sigala; D. Guyomard; A. Verbaere; Y. Piffard; M. Tournoux

    1995-01-01

    Reversible lithium deintercalation of chromium-substituted spinel manganese oxides LiCryMn2 ? yO4 (0 ? y ? 1) in the voltage range 3.4–5.4 V versus Li, occurs in two main steps for 0 < y < 1: one at about 4.9 V and the other at about 4 V. The 4.9 V process capacity increases with the chromium content while the 4

  6. Treatment of paraneoplastic neurological syndromes with antineuronal antibodies (Anti-Hu, Anti-Yo) with a combination of immunoglobulins, cyclophosphamide, and methylprednisolone

    Microsoft Academic Search

    F Keime-Guibert; F Graus; A Fleury; R René; J Honnorat; P Broet; J-Y Delattre

    2000-01-01

    OBJECTIVESTo evaluate the effect of a combination of immunoglobulins (IVIg), cyclophosphamide (CTX), and methylprednisolone (MP) on the clinical course of patients with paraneoplastic neurological syndrome (PNS) and antineuronal antibodies (Abs).METHODSSeventeen patients with paraneoplastic encephalomyelitis\\/sensory neuropathy (PEM\\/SN) with anti-Hu Abs (n=10) or cerebellar degeneration (PCD) with anti-Yo Abs (n=7) received one to nine cycles (mean 3.5) of a combination of IVIg

  7. Comparison of ion-beam irradiation effects in X{sub 2}YO{sub 4} compounds

    SciTech Connect

    Wang, L.; Gong, W.; Wang, S.; Ewing, R.C.

    1999-12-01

    The effects of 1.5 MeV Kr-ion irradiation on seven X{sub 2}YO{sub 4} phases with the olivine (A{sub 2}{sup VI}B{sup IV}O{sub 4}), spinel (A{sup IV}B{sub 2}{sup VI}O{sub 4}), and phenakite structures have been investigated using in situ and high-resolution transmission electron microscopy (HRTEM) over a wide temperature range (20--873 K). At low temperatures ({lt}200 K), the olivine and phenakite are susceptible to radiation-induced amorphization with a critical amorphization dose of 0.2--0.5 displacement per atom (dpa). The critical amorphization dose increases with increasing irradiation temperature at varying rates for the various phases, resulting in a distinct critical amorphization temperature for each phase. For the Mg-Fe series of olivine, the susceptibility to amorphization at higher temperatures (room temperature or above) increases with increasing Fe content. Although the spinel phases are, in general, much more resistant to amorphization, a high-pressure metastable spinel phase, {gamma}-SiFe{sub 2}O{sub 4}, is easily amorphized at doses {lt}0.2 dpa at temperatures below 723 K. This phase decomposes after irradiation at 873 K. At 20 K, complete amorphization of the FeCr{sub 2}O{sub 4} spinel (chromite) is achieved at {approximately}4 dpa, but no evidence of amorphization is observed in MgAl{sub 2}O{sub 4} spinel after 5.4 dpa. The distinct differences in the relative susceptibility of these phases to amorphization are discussed in terms of the structural and chemical controls on the amorphization process.

  8. Transport properties of ceria–zirconia–yttria solid solutions {(CeO 2) x (ZrO 2) 1? x } 1? y (YO 1.5) y ( x = 0–1, y = 0.2, 0.35)

    Microsoft Academic Search

    N. Sakai; Y. P. Xiong; K. Yamaji; H. Kishimoto; T. Horita; M. E. Brito; H. Yokokawa

    2006-01-01

    The electron and hole conductivity, oxygen transport property and thermal expansion behavior of {(CeO2)0.5(ZrO2)0.5}0.65(YO1.5)0.35 solid solution were investigated and the effect of yttrium content was examined by comparing the data with those of {(CeO2)1?x(ZrO2)x}0.8(YO1.5)0.2. The electron conductivity of {(CeO2)0.5(ZrO2)0.5}0.65(YO1.5)0.35 measured by ion blocking method was one order lower than that of {(CeO2)0.5(ZrO2)0.5}0.8(YO1.5)0.2. The increase of yttrium content suppressed the phase

  9. Preparation of 15 mol% YO 1.5-doped ThO 2 disk electrolytes by a polymeric gel-combustion method

    NASA Astrophysics Data System (ADS)

    Arul Antony, S.; Nagaraja, K. S.; Sreedharan, O. M.

    2001-06-01

    A hybrid of polymeric gel and auto-combustion techniques was adapted for the synthesis and lower temperature sintering of 15 mol% YO 1.5-doped thoria (15 YDT) homogeneous solid solutions at 1350°C. The YDT discs so prepared were of density better than 99% theoretical and the cubic cell parameter was ao=558.15(±0.13) pm in close agreement with 557.8 pm recently reported as high quality data in JCPDS confirming the validity of the anion vacancy model for Th 0.85Y 0.15O 1.925.

  10. Thermodynamic analysis of the cubic-tetragonal phase equilibria in the system ZrO{sub 2}-YO{sub 1.5}

    SciTech Connect

    Katamura, Junji; Sakuma, Taketo [Univ. of Tokyo (Japan). Dept. of Materials Science

    1997-10-01

    The cubic-tetragonal (c-t) phase equilibria in the system ZrO{sub 2}-YO{sub 1.5} are thermodynamically analyzed from Landau`s phenomenological theory. The calculated c-t two-phase field is depicted as a miscibility gap with a sharp maximum and the spinodal region as originally predicted by Hillert and Sakuma. However, the observed c-t two-phase field and the spinodal region are better described by the present model. In addition, this model can be used to discuss the nature of the c-t diffusionless transformation from the order parameter in contrast with the original model. The predicted change in the tetragonality of t-ZrO{sub 2} with YO{sub 1.5} content is slightly different from that in the cla axial ratio estimated from X-ray diffraction analysis. The displacement of cations and anions may not take place simultaneously during the c-t transformation.

  11. Perturbation of Ag thick film microstrip ring resonator due to superstrate Ni0.6Co0.4AgyMn2-yO4 ceramics

    NASA Astrophysics Data System (ADS)

    Jadhav, Rupali; Patil, S. P.; Mathad, S. N.; Kanade, S. A.; Puri, Vijaya

    2013-06-01

    The Ag concentration dependent microwave dielectric properties of Ni0.6Co0.4AgyMn2-yO4 (0.1?y?0.5) ceramic in bulk and thick film form were investigated in the 13GHz to 18GHz range by using perturbation of electromagnetically coupled Ag thick film microstrip ring resonator due to superstrate. The Ag thick film microstrip ring resonator has been used to predict microwave dielectric constant of superstrate material. The composition dependent ring resonator changes its response like resonance frequency (higher transmission) which is used to predict the dielectric constant of superstrate material. The overlaid decreases the resonance frequency with rising peak output and it shows the composition dependent variations in microwave dielectric constant and it increases with increase in Ag content. The values of the bandwidth of Ag thick film ring resonator increases with Ag content and Q (quality factor) value of ring resonator decreases.

  12. Thermal stability and oxidation resistance of TiCrAlYO coatings on SS430 for solid oxide fuel cell interconnect applications

    SciTech Connect

    Chen, Hui; Lucas, J. A.; Priyantha, Weerasinghe A.; Kopczyk, M.; Smith, Richard J.; Lund, Kasey R.; Key, Camas; Finsterbusch, M.; Gannon, Paul E.; Deibert, Max; Gorokhovsky, Vladimir I.; Shutthanandan, V.; Nachimuthu, Ponnusamy

    2008-06-25

    Chromia-forming ferritic stainless steels are being considered for interconnects applications in planar solid oxide fuel cell (SOFC) stacks because of their low cost and physical properties. At high temperatures, ferritic steels lack environmental stability in the SOFC operating environment, and gradually degrade the cell performance. In this study, an effective, dense and well adherent TiCrAlYO coating was deposited on an SS430 alloy using the filtered arc deposition technique. High-energy ion backscattering was used to characterize the composition and the thermal stability of the coatings. The chromium volatility of the coated steel plates at 800 oC was also measured using ion beam analysis. Significant reductions in oxidation rates as well as reduced Cr volatility were observed for the coated alloys.

  13. Synthesis and luminescence properties of Sm3+-doped La2WyMo2-yO9 orange-red phosphors

    NASA Astrophysics Data System (ADS)

    Deng, Yaomin; Yi, Shuangping; Huang, Jun; Zhao, Weiren; Xian, Jieqiang

    2014-01-01

    La2WyMo2-yO9 phosphors activated with the trivalent rare-earth Sm3+ were synthesized via a traditional solid-state reaction, their structure and luminescence properties were investigated by using X-ray diffractometer and fluorescence spectrophotometer. There were three emission peaks centered at 563, 599, and 646 nm corresponding to the 4G5/2?6H5/2, 4G5/2?6H7/2, 4G5/2?6H9/2 transitions of Sm3+ under the 402 nm ultraviolet excitation. Investigation on Sm3+ concentration-dependent emission spectra indicated that La1.97WMoO9:3% Sm3+ phosphor exhibited the strongest orange-red emission with a CIE value of (0.5425, 0.4541). Therefore, it is considered to be a new promising orange-red emitting phosphor for white light emitting diode (LED) application.

  14. Self-irradiation effects in dense and tailored porosity U 1-yAm yO 2-x ( y = 0.10; 0.15) compounds

    NASA Astrophysics Data System (ADS)

    Prieur, D.; Jankowiak, A.; Roudil, D.; Dubois, S.; Leorier, C.; Herlet, N.; Dehaudt, P.; Laval, J.-P.; Blanchart, P.

    2011-04-01

    Dense and tailored porosity U 1-yAm yO 2-x ( y = 0.10; 0.15) pellets were fabricated to determine the influence of the microstructure on the self-irradiation effect at room temperature due to Am ? decay. A first positron annihilation lifetime spectroscopy (PALS) approach showed the presence of vacancy type defects due to the cumulative decay dose. When He fills these vacancies, a void growth and swelling can occur. In addition, accurate diameter measurements with time were performed showing that a macroscopic swelling of 1% could be attained for the high density material. The stage value seems to depend on both type and porosity level. Swelling laws describing the diameter variation have been determined.

  15. Relationship between the electrochemical behavior and Li arrangement in Li(x)M(y)Mn(2-y)O4 (M = Co, Cr) with spinel structure.

    PubMed

    Kashiwagi, Tomoaki; Nakayama, Masanobu; Watanabe, Kyohei; Wakihara, Masataka; Kobayashi, Yo; Miyashiro, Hajime

    2006-03-16

    The relationship between the electrochemical behavior and the arrangement of lithium/vacancies has been investigated with electrochemical Li removal in Li(x)M(y)Mn(2-y)O4 (x < or = 1.0, 0.0 < or = y < or = 0.3, M = Co, Cr). It was shown that the electrochemical removal proceeds via two voltage regions: (1) approximately 3.9 V at x > or = approximately 0.5 and (2) approximately 4.2 V at x < or = approximately 0.5. To understand the stepwise behavior, entropy measurement of reaction, DeltaS(obs), was performed by using the electrochemical methods. The changes of the sign in deltaS(obs) from negative to positive at the composition x approximately 0.50 in Li(x)M(y)Mn(2-y)O4 indicated that the ordered arrangement of Li/vacancies was formed with electrochemical Li removal. Moreover, such an ordering was suppressed by the substitution of Co3+ and Cr3+ for Mn3+. To clarify the nature and origin of Li/vacancy ordering, the Monte Carlo simulation was performed in view of Coulombic interaction. The simulation reproduced the formation of a new phase arising from Li/vacancy ordering at x = 0.50 in Li(x)Mn2O4. In addition, the ordered arrangement of Li/vacancy at x = 0.5 was perturbed by the trivalent M3+ replacement in spinel structure due to the local clustering of Li+ around M3+. Consequently, the electrochemical behavior in spinel LiMn2O4 was deeply related to the Coulombic interactions, proved by the fact that experimentally observed changes in entropy agreed well with Monte Carlo simulation based on the Coulombic interaction. PMID:16526742

  16. A single crystal x-ray study of the fluorite-related {open_quotes}solid solutions{close_quotes} of CeO{sub 2}-YO{sub 1.5}

    SciTech Connect

    Gabbitas, N.; Thompson, J.G.; Withers, R.L.; Rae, A.D. [Australian National Univ., Canberra (Australia)] [Australian National Univ., Canberra (Australia)

    1995-02-15

    A study of the (1 - {delta})CeO{sub 2} {circ} {delta}YO{sub 1.5} solid solution has been undertaken to understand the origin of the two-phase region that occurs between the fluorite-type, 0-{approximately}50 mole% YO{sub 1.5}, and C-type, {approximately}73-100 mole% YO{sub 1.5}, solid solutions. Single crystal X-ray diffraction data have been collected at 49.7, 73.0, and 79.8 mole% YO{sub 1.5}(cubic, Ia3, a = 10.757(2), 10.698(4), 10.678(3) {Angstrom}, Z = 32) and the structures refined to R{sub 1} = 0.0841, 0.0146, and 0.0202 for 29, 25, and 72 independent reflections, respectively. The deviations from the ideal fluorite structure were examined and an apparent discontinuity observed for the metal atom shift allowed by Ia3 symmetry. Previously suggested metal atom ordering was not observed in the C-type structure. Models have been proposed to understand the limiting compositions of the fluorite-type and C-type solid solutions.

  17. Role of magnetic moments in the metal-to-insulator transition in LiAlyTi2-yO4

    NASA Astrophysics Data System (ADS)

    Fazileh, F.; Chen, X.; Gooding, R. J.; Atkinson, W. A.; Johnston, D. C.

    2009-02-01

    While the high-Tc cuprate problem remains an active field of research, several parallel studies in potentially related physical systems have been undertaken. For example, LiTi2O4, known to have a superconducting Tc of about 13K, has been suggested to have a strong relation to the cuprates. Our studies are addressing the key question: Are strong electronic correlations found in LiTi2O4? To answer this we have focussed on a study of the metal-to-insulator transition that LiAlyTi2-yO4 is found to undergo for y~ 0.3, and have modelled this material using a quantum-site percolation model that includeselectronic correlations through an on-site repulsive Hubbard interaction. We find that in sucha model this transition is reproduced through the appearance of an Altshuler-Aronov-like suppression of the density of states at the Fermi level, called by some a pseudogap, when an intermediate-strength Hubbard interaction is introduced. Here we focus on results displaying the essential role that magnetic moments that develop on the Ti sites seem to play in producing this transition, physics absent from the original Altshuler-Aronov analysis.

  18. Oxygen isotope effect in disordered underdoped and overdoped La 2-xSr xCu 1-yZn yO 4 superconductors

    NASA Astrophysics Data System (ADS)

    Naqib, S. H.; Islam, R. S.

    2011-04-01

    The effect of oxygen isotopic substitution on the superconducting transition temperature has been studied for heavily underdoped and overdoped La 2-xSr xCu 1-yZn yO 4 compounds with different Zn contents in the CuO 2 plane. The effect of Zn on the isotope coefficient, ?, was significantly more pronounced in the case of the underdoped ( x = 0.09) compounds compared to the overdoped ( x = 0.22) ones. The variation of ? with disorder content can be described quite well within a model based solely on Cooper pair-breaking in the case of the underdoped compounds. This model fails to describe the behavior of ?( y) for the overdoped samples, even though Zn still suppresses T c very effectively at this hole (Sr) content, indicating that the Zn induced pair-breaking is still very much at play. We discuss the implications of these findings in details by considering the Zn induced magnetism, stripe correlations, and possible changes in the superconducting order parameter as hole content in the CuO 2 plane, p (? x), is varied.

  19. Sol-gel synthesis of red-phosphors [Na xGd 1-x/3-zEu z]Mo yW 1-yO 4 powers and luminescence properties

    NASA Astrophysics Data System (ADS)

    Cao, Fa-Bin; Li, Liao-Sha; Tian, Yan-Wen; Gao, Zhi-Fang; Chen, Yong-Jie; Xiao, Lin-Jiu; Wu, Xing-Rong

    2011-04-01

    In this work, we report on the sol-gel synthesis of red-phosphors [Na xGd 1-x/3-zEu z]Mo yW 1-yO 4 powders doped with several dopants and its luminescence properties at room temperature. X-ray diffraction patters indicated that red-phosphors powders present tetragonal symmetry and cubic structure. The red-phosphors [Na xGd 1-x/3-zEu z]Mo yW 1-yO 4 powders doped exhibit characteristic of a ultraviolet visible-light emission diode. The SEM images for [ NaGdEu0.043+]Mo 0.4W 0.6O 4 phosphor exhibits irregular morphology and cottonlike shape. The size of the particles is estimated to be about 1 ?m. Luminescence properties showed that the maximum emission in red region lies in the arrange of 613 nm and 617 nm.

  20. Pulsed-nozzle Fouriertransform microwave spectroscopy of laser-vaporized metal oxides - Rotational spectra and electric dipole moments of YO, LaO, ZrO, and HfO

    Microsoft Academic Search

    R. D. Suenram; F. J. Lovas; G. T. Fraser; K. Matsumura

    1990-01-01

    The rotational spectra of YO, LaO, ZrO, and HfO have been measured using a Fourier-transform microwave spectrometer in combination with a laser-ablation source. Here, a {ital Q}-switched Nd:YAG laser (532 nm) was used to vaporize the metal oxides from a target source rod located in the throat of a pulsed-molecular-beam valve. A description of the instrument is given. The electric

  1. Pulsed-nozzle Fouriertransform microwave spectroscopy of laser-vaporized metal oxides: Rotational spectra and electric dipole moments of YO, LaO, ZrO, and HfO

    Microsoft Academic Search

    R. D. Suenram; F. J. Lovas; G. T. Fraser; K. Matsumura

    1990-01-01

    The rotational spectra of YO, LaO, ZrO, and HfO have been measured using a Fourier-transform microwave spectrometer in combination with a laser-ablation source. Here, a Q-switched Nd:YAG laser (532 nm) was used to vaporize the metal oxides from a target source rod located in the throat of a pulsed-molecular-beam valve. A description of the instrument is given. The electric dipole

  2. Tips To help ReDUCe YoUR soDiUM iNTAKe Read the nutrition facts label for sodium content and choose the product that is lower in

    E-print Network

    Science and Human Nutrition, 3/09 What Sodium doeS in the Body · Helps maintain water balance · RegulatesTips To help ReDUCe YoUR soDiUM iNTAKe 1 2 3 4 5 Read the nutrition facts label for sodium content at the table. Sodium: The Facts By Beth H. Olson, Ph.D., MSU Extension Nutrition Specialist, Department of Food

  3. Early protein intake and later obesity risk: which protein sources at which time points throughout infancy and childhood are important for body mass index and body fat percentage a t7yo fage?1-3

    Microsoft Academic Search

    Anke LB; Thomas Remer Gunther; Anja Kroke; Anette E Buyken

    Background: A high early protein intake has been proposed to increase obesity risk. Objective: We examined whether a critical period of protein intake for later obesity may exist early in childhood and investigated the relation between protein intake from different sources and body mass index SD score and body fat percentage (BF%) a t7yo fage. Design:Thestudypopulationincluded203participantsoftheDort- mundNutritionalandLongitudinallyDesignedStudywithinforma- tion on diet

  4. Structure, band gap, and Mn-related mid-gap states in epitaxial single crystal (Zn{sub 1-x}Mg{sub x}){sub 1-y}Mn{sub y}O thin films

    SciTech Connect

    Zhu Dapeng; Liu Guolei; Xiao Shuqin; Yan Shishen; He Shumin; Cai Li; Li Qinghao; Hu Shujun; Chen Yanxue; Kang Shishou; Mei Liangmo [School of Physics, National Key Laboratory of Crystal Materials, Shandong University, Jinan, Shandong 250100 (China); Cao Qiang [School of Physics, National Key Laboratory of Crystal Materials, Shandong University, Jinan, Shandong 250100 (China); Department of Physics, Qufu Normal University, Qufu, Shandong 273165 (China)

    2013-05-07

    Epitaxial (Zn{sub 1-x}Mg{sub x}){sub 1-y}Mn{sub y}O thin films were grown on c-Al{sub 2}O{sub 3} substrates by radio frequency oxygen plasma assisted molecular beam epitaxy. Single crystal structure of the (Zn{sub 1-x}Mg{sub x}){sub 1-y}Mn{sub y}O films was revealed by reflection high energy electron diffraction and X-ray diffraction. The band gap of the films can be tuned dramatically with increasing the Mg concentration, while the onset energy of Mn-related mid-gap absorption band only shows a small blue shift. Photoconductivity measurements indicate the Mn-related mid-gap states in (Zn{sub 1-x}Mg{sub x}){sub 1-y}Mn{sub y}O films can create free carriers and contribute to charge transfer transitions. The conduction band offset {Delta}E{sub C} = 0.13 eV and valence band offset {Delta}E{sub V} = 0.1 eV were obtained for ZnO/Zn{sub 0.8}Mg{sub 0.2}O heterostructures, which increase to {Delta}E{sub C} = 0.21 eV and {Delta}E{sub V} = 0.14 eV for ZnO/Zn{sub 0.7}Mg{sub 0.3}O heterostructures.

  5. Temperature and Composition Dependence of the Cation Distribution in Synthetic ZnFe yAl 2- yO 4 (0 ? y ? 1) Spinels

    NASA Astrophysics Data System (ADS)

    Waerenborgh, J. C.; Figueiredo, M. O.; Cabral, J. M. P.; Pereira, L. C. J.

    1994-08-01

    Members of the spinel solid solution series ZnFe yAl 2- yO 4 ( y = 0, 0.2, 0.4, 0.6, 1.0, 1.5, and 2) were synthesized by direct solid state reaction of the simple metal oxides in air at 1400 K. Two aliquots of the single-phase spinels obtained for each composition were annealed at 1350 and 1000 K for 48 hr and then quenched in water. The structural study of the quenched samples was performed by powder XRD, using the Rietveld method of structure refinement. The inversion degrees estimated for ZnFe 2O 4 up to 1350 K are in good agreement with those published by O'Neill ( Eur. J. Mineral. 4, 571 (1992)) in the range 773-1223 K. The nonlinear enthalpy of disordering model of O'Neill and Navrotsky ( Am. Mineral. 68, 181 (1983); Am. Mineral. 69, 733 (1984)), recently applied to several studies of simple spinel oxides, could successfully describe the cation arrangement in spinels of the binary solid solution series prepared in this work, with parameters ? Zn-Al = +82 kJ mole -1, ? Zn-Fe3 = +46 kJ mole -1, ? = -20 kJ mole -1, and ?=0. 57Fe Mössbauer spectra collected at 300 and 80 K consisted of only one doublet. Although the contribution of tetrahedral Fe 3+ could not be resolved, the variation of the estimated average hyperfine parameters with composition and quenching temperature could be correlated with the cation arrangement deduced from XRD data.

  6. Como Lo Hago Yo: Myelomeningocele

    PubMed Central

    Lazareff, Jorge

    2014-01-01

    Fortificación con ádico fólico es efectiva, pero aún falta conciencia en los jóvenes. La legalidad del aborto aumenta la importancia de la consulta prenatal. Realizo la cirugía bajo microcoscopio por razones didácticas. Irrigación continua para reducir la temperatura del tejido. Trato a la plaqueta como tejido viable. No suturo la plaqueta. No cierro músculo. ATB por una semana después de cirugía. Hidrocefalia: Válvula en todos los casos de ventriculomegalia. Médula anclada: Desanclar una sola vez. Chiari II: Revisar la válvula. Incluir en el seguimiento rendimiento escolar, puede indicar obstrucción de la válvula o médula anclada. PMID:24791217

  7. Looking Around = No Yo Pisa.

    ERIC Educational Resources Information Center

    Brescia, William; And Others

    The illustrated word book provides Choctaw words for objects in a house, at school, and in town. Suggested learning activities for this supplementary reading material are provided in the "Choctaw Culture Early Education Activities" guide. (ERB)

  8. Synthesis of [(Ca1-xSrx)2-2y](Ti2-2yLi2y)Si2yO6-y Ceramic and its Application in Efficient Plasma Decomposition of CO2

    NASA Astrophysics Data System (ADS)

    Li, Ruixing; Tang, Qing; Yin, Shu; Sato, Tsugio

    According to both the first principle and materials chemistry, a method for fabricating [(Ca1-xSrx)2-2y](Ti2-2yLi2y)Si2yO6-y ceramic was investigated. It was considered that the sintering was promoted by self-accelerated diffusion due to the formation of point defects caused by doping with Li2Si2O5. Consequently, a concept of non-stoichiometrically activated sintering, which was enhanced by point defects without the help of a grain boundary phase, was systematically studied in the Ca1-xSrxTiO3-Li2Si2O5 system. The mechanical and dielectric properties of [(Ca1-xSrx)2-2y](Ti2-2yLi2y)Si2yO6-y were greatly enhanced by adding Li2Si2O5. To improve CO2 decomposition activity, [(Ca1-xSrx)2-2y](Ti2-2yLi2y)Si2yO6-y, which possesses both high permittivity and high dielectric strength was used as a dielectric barrier to decompose CO2 by dielectric barrier discharges (DBDs) plasma without using any catalyst and auxiliary substance. It successfully generated DBDs plasma and the CO2 conversion was much higher than that using an alumina or a silica glass barrier which was widely used as the dielectric barrier in previous studies.

  9. Synthesis of [(Ca1-xSrx)2-2y](Ti2-2yLi2y)Si2yO6-y Ceramic and its Application in Efficient Plasma Decomposition of CO2

    Microsoft Academic Search

    Ruixing Li; Qing Tang; Shu Yin; Tsugio Sato

    2010-01-01

    According to both the first principle and materials chemistry, a method for fabricating [(Ca1-xSrx)2-2y](Ti2-2yLi2y)Si2yO6-y ceramic was investigated. It was considered that the sintering was promoted by self-accelerated diffusion due to the formation of point defects caused by doping with Li2Si2O5. Consequently, a concept of non-stoichiometrically activated sintering, which was enhanced by point defects without the help of a grain boundary

  10. Low thermal conductivity without oxygen vacancies in equimolar YO 1.5 + TaO 2.5- and YbO 1.5 + TaO 2.5-stabilized tetragonal zirconia ceramics

    Microsoft Academic Search

    Yang Shen; Rafael M. Leckie; Carlos G. Levi; David R. Clarke

    2010-01-01

    A narrow range of composition exists along both the ZrO2–YTaO4 and ZrO2–YbTaO4 quasi-binaries over which the tetragonal zirconia phase can be retained on cooling. Unlike other stabilized zirconia materials which have low thermal conductivity as a result of phonon scattering by oxygen vacancies, these compositions do not contain oxygen vacancies and yet an equimolar YO1.5+TaO2.5 composition has been reported to

  11. Social Networking? Secure Networking?

    E-print Network

    Chapman, Michael S.

    Social Networking? Secure Networking? Teaching & Learning Technology Roundtable February 2010 #12 ­ The intent behind the current security measures in place at OHSU ­ The OHSU Social Networking Guidelines 2. To begin a campus wide dialogue exploring the changing world of online social networking and it

  12. Pulsed-nozzle Fourier-transform microwave spectroscopy of laser-vaporized metal oxides: Rotational spectra and electric dipole moments of YO, LaO, ZrO, and HfO

    SciTech Connect

    Suenram, R.D.; Lovas, F.J.; Fraser, G.T.; Matsumura, K. (Molecular Physics Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (USA))

    1990-04-15

    The rotational spectra of YO, LaO, ZrO, and HfO have been measured using a Fourier-transform microwave spectrometer in combination with a laser-ablation source. Here, a {ital Q}-switched Nd:YAG laser (532 nm) was used to vaporize the metal oxides from a target source rod located in the throat of a pulsed-molecular-beam valve. A description of the instrument is given. The electric dipole moments of the four species have been measured and compared to {ital ab} {ital initio} results, where available. The experimental values are {mu}{sub YO} =4.524(7), {mu}{sub LaO} =3.207(11), {mu}{sub ZrO} =2.551(11), and {mu}{sub HfO} =3.431(5) D. Of special note are the extremely large nuclear quadrupole coupling constants, eQq, determined for the {sup 177}HfO and {sup 179}HfO isotopic species, with values of {minus}5952.649(35) MHz and {minus}6726.981(39) MHz, respectively. This is the first determination of nuclear quadrupole coupling constants for a molecule containing the Hf atom.

  13. YO A{sup 2}II{sub 1/2,3/2} vibrational state distributions measured after the excimer laser ablation of Y{sub 2}O{sub 3} using a laser-initiated pulsed discharge as a probe

    SciTech Connect

    Fried, D.; Kushida, T.; Reck, G.P.; Rothe, E.W. [Wayne State Univ., Detroit, MI (United States)

    1994-02-01

    The vibrational populations of the YO A{sup 2}II-{Chi}{sup 2}{Sigma} system of YO were measured in the plasmas generated after the excimer laser ablation of Y{sub 2}O{sub 3} in oxygen when both continuous and pulsed electric fields were applied. When an electric field is applied antiparallel to the direction of propagation of the ejected electrons, two luminous plumes appear, separated by several microseconds. The measured vibrational populations of the YO A{sup 2}II-{Chi}{sup 2}{Sigma} system are different for each plume. The YO A{sup 2}II populations were nonthermal in the first plume, representing emission from chemiluminescent reactive collisions in the plume after ablation. The second emission pulse, initiated by the discharge of a high-voltage capacitor, probes the ground-state YO in the plume via electron collisions. This pulsed electric field holds promise as a diagnostic probe of the ground-state species emitted in laser ablative processes. 11 refs., 5 figs., 1 tab.

  14. Coprecipitation and hydrothermal synthesis of ultrafine 5.5 mol% CeO{sub 2}-2 mol% YO{sub 1.5}-ZrO{sub 2} powders

    SciTech Connect

    Lin, J.D.; Duh, J.G. [National Tsing Hua Univ., Hsinchu (Taiwan, Province of China). Dept. of Materials Science and Engineering

    1997-01-01

    Ultrafine 5.5 mol% CeO{sub 2}-2 mol% YO{sub 1.5}-ZrO{sub 2} powders with controllable crystallite size were synthesized by two kinds of coprecipitation methods and subsequent crystallization treatment. The amorphous gel produced by ammonia coprecipitation and hydrothermal treatment at 200 C for 3.5 h results in an ultrafine powder with a surface area of 206 m{sup 2}/g and a crystallite size of 4.8 nm. The powder produced by urea hydrolysis and calcination exhibits a purely tetragonal phase. In addition, the powders crystallized by hydrothermal treatment exhibit high packing density and can be sintered at lower temperature (<1,400 C) with nearly 100% tetragonal phase achieved.

  15. Artificial Neural Networks Single Layer Networks Multi Layer Networks Generalization Artificial Neural Networks

    E-print Network

    Kjellström, Hedvig

    Artificial Neural Networks Single Layer Networks Multi Layer Networks Generalization Artificial Neural Networks #12;Artificial Neural Networks Single Layer Networks Multi Layer Networks Generalization 1 Artificial Neural Networks Properties Applications Classical Examples Biological Background 2

  16. Artificial Neural Networks Single Layer Networks Multi Layer Networks Generalization Artificial Neural Networks

    E-print Network

    Kjellström, Hedvig

    Artificial Neural Networks Single Layer Networks Multi Layer Networks Generalization Artificial Neural Networks Artificial Neural Networks Single Layer Networks Multi Layer Networks Generalization 1 Artificial Neural Networks Properties Applications Classical Examples Biological Background 2 Single Layer

  17. A correlation between the oxygen stoichiometry and T c of Bi 2CaSr 2(1-x)Cu 2(1-y)O 8+?-2x-2y superconductors

    NASA Astrophysics Data System (ADS)

    Kao, H.-C. I.; Chen, W. L.; Wei, T. P.; Lin, J. C.; Wang, C. M.

    1991-07-01

    A series of superconductors with a nominal composition of Bi 2CaSr 2(1-x)Cu 2O 8-2x+? or Bi 2CaSr 2 Cu 2(1-y)O 8-2y+?, where 0? x, y?0.6, was prepared under identical conditions at 830°C. Their superconductivity degraded rapidly if x or y was larger than 0.4. from X-ray diffraction studies, it was suggested that vacancies were created when part of the SrO or CuO was removed from the Bi 2CaSr 2Cu 2O 8+?. The extra oxygen stoichiometry, ?, decreased with increasing x but increased with increasing y. When ? was in between 0.04 and 0.18, Tc(zero) of Bi 2CaSr 2Cu 2O 8+? was not dependent on ? and it was found to be about 60 K. Above this range, Tc(zero) decreased rapidly.

  18. H+ diffusion and electrochemical stability of Li1+x+yAlxTi2-xSiyP3-yO12 glass in aqueous Li/air battery electrolytes

    NASA Astrophysics Data System (ADS)

    Ding, Fei; Xu, Wu; Shao, Yuyan; Chen, Xilin; Wang, Zhiguo; Gao, Fei; Liu, Xingjiang; Zhang, Ji-Guang

    2012-09-01

    It is well known that LATP (Li1+x+yAlxTi2-xSiyP3-yO12) glass is a good lithium (Li)-ion conductor. However, the interaction between LATP glass and H+ ions in aqueous electrolytes (including the diffusion and surface adsorption of H+ ions) needs to be well understood before the long-term application of LATP glass in an aqueous electrolyte can be realized. In this work, we investigate H+-ion diffusion in LATP glass and their interactions with the glass surface using both experimental and modeling approaches. Our results indicate that the apparent H+-related current observed in the initial cyclic voltammetry scan should be attributed to the adsorption of H+ ions on the LATP glass rather than the bulk diffusion of H+ ions. Furthermore, density functional theory calculations indicate that the H+-ion diffusion energy barrier (3.21 eV) is much higher than that for Li+ ions (0.79 eV) and Na+ ions (0.79 eV) in a NASICON-type LiTi2(PO4)3 material. As a result, H+-ion conductivity in LATP glass is negligible at room temperature. However, significant surface corrosion was found after the LATP glass in a strong alkaline electrolyte. Therefore, to prevent LATP glass from corrosion, appropriate electrolytes must be developed for long-term operation of LATP in aqueous Li-air batteries.

  19. Microstructures and properties of laser-glazed plasma-sprayed ZrO{sub 2}-YO{sub 1.5}/Ni-22Cr-10Al-1Y thermal barrier coatings

    SciTech Connect

    Tsai, H.L.; Tsai, P.C. [National Taiwan Inst. of Tech., Taipei (Taiwan, Province of China). Dept. of Mechanical Engineering and Technology

    1995-12-01

    Thermal barrier coatings (TBCs) consisting of two layers with various yttria contents (ZrO{sub 2}-YO{sub 1.5}/Ni-22Cr-10Al-1Y) were plasma sprayed, and parts of the various specimens were glazed by using a pulsed CO{sub 2} laser. All the specimens were then subjected to furnace thermal cycling tests at 1,100 C; the effect of laser glazing on the durability and failure mechanism of the TBCs was then evaluated. From these results, two models were developed to show the failure mechanism of as-sprayed and laser-glazed TBCs: model A, which is thermal-stress dominant, and model V, which is oxidation-stress dominant. For top coats containing cubic phase, cubic and monoclinic phases, or tetragonal and a relatively larger amount of monoclinic phases, whose degradation is thermal-stress dominant, laser glazing improved the durability of TBCs by a factor of about 2 to 6. Segmented cracks that occurred during glazing proved beneficial for accommodating thermal stress and raising the tolerance to oxidation, which resulted in a higher durability. Thermal barrier coatings with top coats containing tetragonal phase had the highest durability. Degradation of such TBCs resulted mainly from oxidation of the bond coats. For top coats with a greater amount of monoclinic phase, thermal mismatch stress occurred during cooling and detrimentally affected durability.

  20. Network Cosmology

    PubMed Central

    Krioukov, Dmitri; Kitsak, Maksim; Sinkovits, Robert S.; Rideout, David; Meyer, David; Boguñá, Marián

    2012-01-01

    Prediction and control of the dynamics of complex networks is a central problem in network science. Structural and dynamical similarities of different real networks suggest that some universal laws might accurately describe the dynamics of these networks, albeit the nature and common origin of such laws remain elusive. Here we show that the causal network representing the large-scale structure of spacetime in our accelerating universe is a power-law graph with strong clustering, similar to many complex networks such as the Internet, social, or biological networks. We prove that this structural similarity is a consequence of the asymptotic equivalence between the large-scale growth dynamics of complex networks and causal networks. This equivalence suggests that unexpectedly similar laws govern the dynamics of complex networks and spacetime in the universe, with implications to network science and cosmology. PMID:23162688

  1. Network Solutions.

    ERIC Educational Resources Information Center

    Vietzke, Robert; And Others

    1996-01-01

    This special section explains the latest developments in networking technologies, profiles school districts benefiting from successful implementations, and reviews new products for building networks. Highlights include ATM (asynchronous transfer mode), cable modems, networking switches, Internet screening software, file servers, network management…

  2. Network Programming 1 Computer Networks

    E-print Network

    Verschelde, Jan

    Network Programming 1 Computer Networks client/server architecture, protocols, and sockets 2 Network Programming a simple client/server interaction the module socket in Python 3 Monte Carlo Verschelde, 30 October 2013 Scientific Software (MCS 507 L-28) network programming 30 October 2013 1 / 43 #12

  3. The competition of Y?o and X?n halogen bonds to enhance the group V ?-hole interaction in the NCY?o?PH3 ?NCX and O?PH3 ?NCX?NCY (X, Y?F, Cl, and Br) complexes.

    PubMed

    Li, Wei; Zeng, Yanli; Li, Xiaoyan; Sun, Zheng; Meng, Lingpeng

    2015-07-01

    The positive electrostatic potentials (ESP) outside the ?-hole along the extension of O?P bond in O?PH3 and the negative ESP outside the nitrogen atom along the extension of the C?N bond in NCX could form the Group V ?-hole interaction O?PH3 ?NCX. In this work, the complexes NCY?O?PH3 ?NCX and O?PH3 ?NCX?NCY (X, Y?F, Cl, Br) were designed to investigate the enhancing effects of Y?O and X?N halogen bonds on the P?N Group V ?-hole interaction. With the addition of Y?O halogen bond, the VS, max values outside the ?-hole region of O?PH3 becomes increasingly positive resulting in a stronger and more polarizable P?N interaction. With the addition of X?N halogen bond, the VS, min values outside the nitrogen atom of NCX becomes increasingly negative, also resulting in a stronger and more polarizable P?N interaction. The Y?O halogen bonds affect the ?-hole region (decreased density region) outside the phosphorus atom more than the P?N internuclear region (increased density region outside the nitrogen atom), while it is contrary for the X?N halogen bonds. © 2015 Wiley Periodicals, Inc. PMID:25916886

  4. Antisite-disorder, magnetic and thermoelectric properties of Mo-rich Sr2Fe1-yMo1+yO6 (0 ?y? 0.2) double perovskites.

    PubMed

    Popuri, Srinivasa R; Redpath, Debbie; Chan, Gavin; Smith, Ronald I; Cespedes, Oscar; Bos, Jan-Willem G

    2015-06-21

    Structure analysis using X-ray and neutron powder diffraction and elemental mapping has been used to demonstrate that nominal A-site deficient Sr2-xFeMoO6-? (0 ?x? 0.5) compositions form as Mo-rich Sr2Fe1-yMo1+yO6 (0 ?y? 0.2) perovskites at high temperatures and under reducing atmospheres. These materials show a gradual transition from the Fe and Mo rock salt ordered double perovskite structure to a B-site disordered arrangement. Analysis of the fractions of B-O-B' linkages revealed a gradual increase in the number of Mo-O-Mo linkages at the expense of the ferrimagnetic (FIM) Fe-O-Mo linkages that dominate the y = 0 material. All samples contain about 10-15% antiferromagnetic (AF) Fe-O-Fe linkages, independent of the degree of B-site ordering. The magnetic susceptibility of the y = 0.2 sample is characteristic of a small domain ferrimagnet (Tc? 250 K), while room temperature neutron powder diffraction demonstrated the presence of G-type AF ordering linked to the Fe-O-Fe linkages (mFe = 1.25(7)?B). The high temperature thermoelectric properties are characteristic of a metal with a linear temperature dependence of the Seebeck coefficient, S (for all y) and electrical resistivity ? (y? 0.1). The largest thermoelectric power factor S(2)/? = 0.12 mW m(-1) K(-1) is observed for Sr2FeMoO6 at 1000 K. PMID:25501989

  5. Effects of Zn substitution on the magnetic and transport properties of La 0.6Sr 0.4Mn 1- yZn yO 3-? (0? y?0.3)

    NASA Astrophysics Data System (ADS)

    Vijayanandhini, K.; Kutty, T. R. N.

    2007-02-01

    Phase-singular solid solutions of La 0.6Sr 0.4Mn 1- yZn yO 3-?(0? y?0.3) [LSMZO] perovskite of rhombohedral symmetry (space group: R3¯ c) with y up to 30 at.% could be synthesized notwithstanding the differences in ionic radii of Mn V I3+ (i.r.=0.645 Å) and Zn V I2+ (i.r.=0.74 Å). The LSMZO?02 compositions are ferromagnetic metallic (FMM) at room temperature whereas LSMZO-02-08 are ferromagnetic insulators (FMI) and LSMZO>08 are paramagnetic insulators (PMI). Total obliteration of the FM transition is unique to Zn-doping at y>8 at.% leading to PMI even at low temperatures, measured up to 8 K (presently). The FM to PM transition (Tc) and the peak (Tp) in resistivity-temperature curves decreases with the Zn-content. The charge-transport in p-type LSMZO is predictable by variable range hopping (VRH), which changes to nearest-neighbor hopping of small polarons (NNHP) at T>Tp. Non-stoichiometry (0.005???0.21) evaluated chemically from redox titrations indicated the prevalence of excess oxygen vacancy (V) rather than charge compensatively predictable values which, in turn, indicates the diminishing Mn 4+ content in LSMZO. The V's act as electron donors in p-LSMZO and this increases the resistivity (?) associated with the shift in Tc to low temperatures. Increased ? on annealing in low p is a clear evidence on the role of V in LSMZO.

  6. Computer Networking Computer Networking

    E-print Network

    Rollins, Sami

    Protocol (IP) address. · Each message you send across the Internet contains the IP address of the receiver?) allows you to write a message then uses the Simple Mail Transfer Protocol (SMTP) to send your message Server friend #12;Computer Networking · SMTP exercises ­ MAIL FROM - specifies sender address ­ RCPT

  7. Networking Computers

    NSDL National Science Digital Library

    This tutorial provides a basic overview of the type of networks a computer can be part of. Students will gain an understanding of the different types of computer networks. Flash is required to view this interactive lesson.

  8. Managing networks.

    PubMed

    2015-03-01

    An online toolkit to help network leaders and users manage networks effectively has been set up by NHS Improving Quality in partnership with the Centre for Innovation in Health Management. The learning resource provides: a diagnostic service for leaders to help identify a network's strengths and weaknesses and to shape action; an online community of practitioners to share leadership challenges; a knowledge bank with latest evidence and intelligence on leading effective networks; and the development of a 'health check', which allows leaders of established networks to report their purpose, performance, aims, operations and capacity. For more about the toolkit, go to www.networksdiagnostic.org.uk. PMID:25727435

  9. Network Terminology TCP/IP Network Layers

    E-print Network

    Ramkumar, Mahalingam

    Network Terminology TCP/IP Network Layers Socket Programming Data Communication and Computer;Network Terminology TCP/IP Network Layers Socket Programming 1 Network Terminology 2 TCP/IP Network Layers Programming Data Communication Networks Data (digital data - chunks of bits) Communication (exchange of data

  10. Network Security

    NSDL National Science Digital Library

    This course on Network Security is provided by the Cyber Security Education Consortium (CSEC). The course requires students to perform laboratory assignments in securing networks and operating systems to learn about "network communications from a security standpoint" and "hardware and software security solutions." Links are provided to learn more about the Major Topics Covered, Course Learning Objectives, and Course Outline. The Course Outline includes a list of careers that require the knowledge from this course and related textbooks.

  11. Start Networking!

    NSDL National Science Digital Library

    2014-09-18

    To get a better understanding of complex networks, students create their own, real social network example by interacting with their peers in the classroom and documenting the interactions. They represent the interaction data as a graph, calculate two mathematical quantities associated with the graph—the degree of each node and the degree distribution of the graph—and analyze how these quantities can be used to infer properties of the social network at hand.

  12. Network morphospace.

    PubMed

    Avena-Koenigsberger, Andrea; Goñi, Joaquín; Solé, Ricard; Sporns, Olaf

    2015-02-01

    The structure of complex networks has attracted much attention in recent years. It has been noted that many real-world examples of networked systems share a set of common architectural features. This raises important questions about their origin, for example whether such network attributes reflect common design principles or constraints imposed by selectional forces that have shaped the evolution of network topology. Is it possible to place the many patterns and forms of complex networks into a common space that reveals their relations, and what are the main rules and driving forces that determine which positions in such a space are occupied by systems that have actually evolved? We suggest that these questions can be addressed by combining concepts from two currently relatively unconnected fields. One is theoretical morphology, which has conceptualized the relations between morphological traits defined by mathematical models of biological form. The second is network science, which provides numerous quantitative tools to measure and classify different patterns of local and global network architecture across disparate types of systems. Here, we explore a new theoretical concept that lies at the intersection between both fields, the 'network morphospace'. Defined by axes that represent specific network traits, each point within such a space represents a location occupied by networks that share a set of common 'morphological' characteristics related to aspects of their connectivity. Mapping a network morphospace reveals the extent to which the space is filled by existing networks, thus allowing a distinction between actual and impossible designs and highlighting the generative potential of rules and constraints that pervade the evolution of complex systems. PMID:25540237

  13. Network epistemology Discrete models

    E-print Network

    Zollman, Kevin

    Network epistemology Discrete models Continuous models Social Structure and Social Influence Structure and Social Influence #12;Network epistemology Discrete models Continuous models Network and Social Influence #12;Network epistemology Discrete models Continuous models Network epistemology

  14. Routing in hybrid networks 

    E-print Network

    Gupta, Avinash

    2001-01-01

    Hybrid networks are networks that have wired as well as wireless components. Several routing protocols exist for traditional wired networks and mobile ad-hoc networks. However, there are very few routing protocols designed for hybrid networks...

  15. Network Science for Communication Networks Yuval Shavitt

    E-print Network

    Schuster, Assaf

    Network Science for Communication Networks Yuval Shavitt School of Electrical Engineering shavitt@eng.tau.ac.il http://www.netDIMES.org http://www.eng.tau.ac.il/~shavitt DIMES #12;Network Science · Networks appear #12;Network Science · We all look at networks · We can share tools and ideas · Some problems

  16. Magnetic properties of transition metal substituted La 0.85Ag 0.15Mn 1-yM yO 3 compounds (M=Co, Cr and Al)

    NASA Astrophysics Data System (ADS)

    Srivastava, S. K.; Ravi, S.

    2009-12-01

    In this paper we report a systematic study of Mn-site substitution by M=Co, Cr and Al in La 0.85Ag 0.15MnO 3 series to understand the magnetic interactions between Mn and other transition metals. The long-range ferromagnetic (FM) ordering of the parent compound was significantly affected by Mn-site substitution. The measured magnetic properties of Co-doped samples have been explained on the basis of FM interactions in Mn 3+-O-Mn 4+, Co 2+-O-Mn 4+, Co 3+-O-Mn 4+ networks and simultaneous antiferromagnetic (AFM) interactions in Mn 4+-O-Mn 4+, Co 2+-O-Mn 3+ networks. The magnetic properties of Cr-doped compounds could be understood on the basis of double exchange FM interactions in Mn 3+-O 2--Mn 4+ networks and competing AFM in Cr 3+-O-Mn 4+, Mn 4+-O-Mn 4+, Cr 3+-O-Mn 3+ networks. However, it is found that the doping of Al ions play a role of magnetic dilution, without contributing any other competing magnetic interaction. The field variations of magnetization of all the above three series could be analysed by fitting to Brillouin function model and the effective spin contribution for FM has been determined. The measured saturation magnetization has been explained quantitatively.

  17. Network DEA

    Microsoft Academic Search

    Rolf Färe; Shawna Grosskopf

    2000-01-01

    Most traditional DEA models treat their reference technologies as black boxes. Our network models, developed for the Swedish Institute for Health Economics (IHE), allow us to look into these boxes and to evaluate organizational performance and its component performance. The very general structure of the network model allows us to apply this model to a variety of situations: intermediate products,

  18. Traveling Networks

    NSDL National Science Digital Library

    2012-06-08

    In this geometry activity, learners explore networks painted on playgrounds, such as a four square court, and draw their own. Learners walk on every edge until they return to the starting point without walking on any edge more than once. In doing so, learners explore odd and even points (also called nodes), edges, and possible and impossible networks.

  19. RDP Neural Network RDP Neural Network Construction Principle

    E-print Network

    Gorban, Alexander N.

    RDP Neural Network RDP Neural Network Construction Principle Linear Separability Methods for building RDP Neural Networks Geometrical Approaches for Artificial Neural Networks David Elizondo Centre Elizondo Geometrical Approaches for Artificial Neural Networks #12;RDP Neural Network RDP Neural Network

  20. Temporal networks

    NASA Astrophysics Data System (ADS)

    Holme, Petter; Saramäki, Jari

    2012-10-01

    A great variety of systems in nature, society and technology-from the web of sexual contacts to the Internet, from the nervous system to power grids-can be modeled as graphs of vertices coupled by edges. The network structure, describing how the graph is wired, helps us understand, predict and optimize the behavior of dynamical systems. In many cases, however, the edges are not continuously active. As an example, in networks of communication via e-mail, text messages, or phone calls, edges represent sequences of instantaneous or practically instantaneous contacts. In some cases, edges are active for non-negligible periods of time: e.g., the proximity patterns of inpatients at hospitals can be represented by a graph where an edge between two individuals is on throughout the time they are at the same ward. Like network topology, the temporal structure of edge activations can affect dynamics of systems interacting through the network, from disease contagion on the network of patients to information diffusion over an e-mail network. In this review, we present the emergent field of temporal networks, and discuss methods for analyzing topological and temporal structure and models for elucidating their relation to the behavior of dynamical systems. In the light of traditional network theory, one can see this framework as moving the information of when things happen from the dynamical system on the network, to the network itself. Since fundamental properties, such as the transitivity of edges, do not necessarily hold in temporal networks, many of these methods need to be quite different from those for static networks. The study of temporal networks is very interdisciplinary in nature. Reflecting this, even the object of study has many names-temporal graphs, evolving graphs, time-varying graphs, time-aggregated graphs, time-stamped graphs, dynamic networks, dynamic graphs, dynamical graphs, and so on. This review covers different fields where temporal graphs are considered, but does not attempt to unify related terminology-rather, we want to make papers readable across disciplines.

  1. Monitoring networks using ntop

    Microsoft Academic Search

    L. Deri; R. Carbone; S. Suin

    2001-01-01

    Today's networks present several management challenges due to the variety of network types and the integration of different network media. Network administrators need automated tools to support human effort, gathering information about the status and behaviour of network elements. Network monitoring is probably the most fundamental aspect of automated network management. The goal of this paper is to describe the

  2. Active Networks and Security

    Microsoft Academic Search

    Osman DAVULCU

    Current network technologies do not adequately address some of the today's network problems. Therefore, a new network paradigm called active networks has been proposed. According to this paradigm, not only hosts at the edges of the network but also the nodes in the network could perform computations on the data flowing through the network. Furthermore, the users could program the

  3. Network bipartivity

    NASA Astrophysics Data System (ADS)

    Holme, Petter; Liljeros, Fredrik; Edling, Christofer R.; Kim, Beom Jun

    2003-11-01

    Systems with two types of agents with a preference for heterophilous interaction produce networks that are more or less close to bipartite. We propose two measures quantifying the notion of bipartivity. The two measures—one well known and natural, but computationally intractable, and the other computationally less complex, but also less intuitive—are examined on model networks that continuously interpolate between bipartite graphs and graphs with many odd circuits. We find that the bipartivity measures increase as we tune the control parameters of the test networks to intuitively increase the bipartivity, and thus conclude that the measures are quite relevant. We also measure and discuss the values of our bipartivity measures for empirical social networks (constructed from professional collaborations, Internet communities, and field surveys). Here we find, as expected, that networks arising from romantic online interaction have high, and professional collaboration networks have low, bipartivity values. In some other cases, probably due to low average degree of the network, the bipartivity measures cannot distinguish between romantic and friendship oriented interaction.

  4. Network Topologies

    NSDL National Science Digital Library

    Bartelt, Terry L. M.

    Network topology is the physical arrangement of the switching devices of a network connecting a group of computers or buildings. This brief interactive activity, by the Electromechanical Digital Library and Wisconsin Technical College System faculty, explains how and why these connections are made. It showcases common topologies including mesh, bus, star, and ring topologies. Users can click through these various categories at their own speed, replaying animations and rereading explanations as many times as the individual needs. This is a great resource for students and teachers alike to familiarize themselves with network topologies. [ES

  5. A Probabilistic Selection Network with Butterfly Networks

    E-print Network

    Imai, Hiroshi

    A Probabilistic Selection Network with Butterfly Networks Takahiro Ikeda Department of Information the practical aspects of a butterfly network and shows some useful properties of a butterfly network, which of view that they have been concerned in the implementation of the network by using practical butterfly

  6. Network Swapping

    Microsoft Academic Search

    Emanuele Lattanzi; Andrea Acquaviva; Alessandro Bogliolo

    2005-01-01

    \\u000a Wireless mobile terminals have limited storage memory due to weight, size and power constraints. Potentially unlimited virtual\\u000a memory could be found on remote servers made accessible through a wireless link, but power hungry wireless network interface\\u000a cards (WNIC) may reduce the battery lifetime if not efficiently exploited, actually limiting the practical interest of network\\u000a virtual memory (NVM). On the other

  7. 3~5 [1]. 20 25% , 50 45%

    E-print Network

    Cho, Sung-Bae

    Modeling of Metabolic Syndrome Using Bayesian Networks Han-Saem Park 1,O Sung-Bae Cho 1 and Hong Kyu Lee 2) HDL - 3. 1 . . , . 1 Metabolic syndrome dataMetabolic syndrome data Pre. . . , k- 81.5% . . [1] H. K. Lee, et al., "The prevalence of metabolic syndrome and its relation

  8. Networking from a network coding perspective

    E-print Network

    Ho, Tracey, 1976-

    2004-01-01

    Network coding generalizes network operation beyond traditional routing, or store-and-forward, approaches, allowing for mathematical operations across data streams within a network. This thesis considers a number of ...

  9. Network Evolution Statistics of Networks

    E-print Network

    Goldschmidt, Christina

    transport .01 Pyruvate carboxylase .83 Oxaloacetate transport .04 PEOCK .08 #12;A Model for Network) ­ Enzyme conc., Ek (edges), S ­ internal nodes. P1 S1 P2 E, FCF: gluconeogenesis from lactate Pyruvate

  10. Neural Networks

    SciTech Connect

    Smith, Patrick I.

    2003-09-23

    Physicists use large detectors to measure particles created in high-energy collisions at particle accelerators. These detectors typically produce signals indicating either where ionization occurs along the path of the particle, or where energy is deposited by the particle. The data produced by these signals is fed into pattern recognition programs to try to identify what particles were produced, and to measure the energy and direction of these particles. Ideally, there are many techniques used in this pattern recognition software. One technique, neural networks, is particularly suitable for identifying what type of particle caused by a set of energy deposits. Neural networks can derive meaning from complicated or imprecise data, extract patterns, and detect trends that are too complex to be noticed by either humans or other computer related processes. To assist in the advancement of this technology, Physicists use a tool kit to experiment with several neural network techniques. The goal of this research is interface a neural network tool kit into Java Analysis Studio (JAS3), an application that allows data to be analyzed from any experiment. As the final result, a physicist will have the ability to train, test, and implement a neural network with the desired output while using JAS3 to analyze the results or output. Before an implementation of a neural network can take place, a firm understanding of what a neural network is and how it works is beneficial. A neural network is an artificial representation of the human brain that tries to simulate the learning process [5]. It is also important to think of the word artificial in that definition as computer programs that use calculations during the learning process. In short, a neural network learns by representative examples. Perhaps the easiest way to describe the way neural networks learn is to explain how the human brain functions. The human brain contains billions of neural cells that are responsible for processing information [2]. Each one of these cells acts as a simple processor. When individual cells interact with one another, the complex abilities of the brain are made possible. In neural networks, the input or data are processed by a propagation function that adds up the values of all the incoming data. The ending value is then compared with a threshold or specific value. The resulting value must exceed the activation function value in order to become output. The activation function is a mathematical function that a neuron uses to produce an output referring to its input value. [8] Figure 1 depicts this process. Neural networks usually have three components an input, a hidden, and an output. These layers create the end result of the neural network. A real world example is a child associating the word dog with a picture. The child says dog and simultaneously looks a picture of a dog. The input is the spoken word ''dog'', the hidden is the brain processing, and the output will be the category of the word dog based on the picture. This illustration describes how a neural network functions.

  11. Sensor Networks Communication strategies

    E-print Network

    Chisci, Luigi

    Outline Sensor Networks Communication strategies Follow on Distributed estimation in sensor@dsi.unifi.it February 1, 2007 A. Benavoli Fully Decentralized Networks #12;Outline Sensor Networks Communication strategies Follow on Outline 1 Sensor Networks An introduction to Sensor Networks Network architectures

  12. Network Management Survey.

    ERIC Educational Resources Information Center

    Cotton, Ira W.

    A study was made of management practices in different computer networks. The five networks were chosen as typical of different approaches to network implementation and management: Defense Advanced Research Projects Agency (ARPA) Network, MERIT Network, Triangle Universities Computation Center (TUCC), Oregon State Regional Network, and Tymnet (a…

  13. Adjacency networks

    NASA Astrophysics Data System (ADS)

    Bedogne', C.; Rodgers, G. J.

    2008-12-01

    We consider a finite set S={x1,…,xr} and associate to each element xi a probability pi. We then form sequences ( N-strings) by drawing at random N elements from S with respect to the probabilities assigned to them. Each N-string generates a network where the elements of S are represented as vertices and edges are drawn between adjacent vertices. These structures are multigraphs having multiple edges and loops. We show that the degree distributions of these networks are invariant under permutations of the generating N-strings. We describe then a constructive method to generate scale-free networks and we show how scale-free topologies naturally emerge when the probabilities are Zipf distributed.

  14. Progress in supervised neural networks

    Microsoft Academic Search

    D. R. Hush; B. G. Horne

    1993-01-01

    Theoretical results concerning the capabilities and limitations of various neural network models are summarized, and some of their extensions are discussed. The network models considered are divided into two basic categories: static networks and dynamic networks. Unlike static networks, dynamic networks have memory. They fall into three groups: networks with feedforward dynamics, networks with output feedback, and networks with state

  15. Network reoptimization procedures for multiobjective network probelems

    Microsoft Academic Search

    David L. Olson; Bala Shetty; M. A. Venkataramanan; Ishwar Murthy

    1989-01-01

    Network models are attractive because of their computational efficiency. Network applications can involve multiple objective analysis. Multiple objective analysis requires generating nondominated solutions in various forms. Two general methods exist to generate new solutions in continuous optimization: changing objective function weights and inserting objective bounds through constraints. In network flow problems, modifying weights is straightforward, allowing use of efficient network

  16. Poster: Delay Tolerant Networking for Sensor Networks

    Microsoft Academic Search

    Melissa Ho; Kevin Fall

    2004-01-01

    Sensor network deployments may be far removed from com- munications infrastructure such as the Internet. Yet, to be maximally useful, these networks of sensors must ultimately be connected to data storage and analysis facilities. Provid- ing connectivity for such networks may involve exotic and unusual methods of data transfer. In addition, within such networks, problems of intermittent connectivity due to

  17. Tourism networks and computer networks

    E-print Network

    Baggio, Rodolfo

    2008-01-01

    The body of knowledge accumulated in recent years on the structure and the dynamics of complex networks has offered useful insights on the behaviour of many natural and artificial complex systems. The analysis of some of these, namely those formed by companies and institutions, however, has proved problematical mainly for the difficulties in collecting a reasonable amount of data. This contribution argues that the World Wide Web can provide an efficient and effective way to gather significant samples of networked socio-economic systems to be used for network analyses and simulations. The case discussed refers to a tourism destination, the fundamental subsystem of an industry which can be considered one of the most important in today's World economy.

  18. Network coding

    E-print Network

    Lehman, April Rasala, 1977-

    2005-01-01

    In the network coding problem, there are k commodities each with an associated message Mi, a set of sources that know Mi and a set of sinks that request Mi. Each edge in the graph may transmit any function of the messages. ...

  19. sensor networks

    Microsoft Academic Search

    Satyajayant Misra; Guoliang Xue

    In this paper, we propose two simple and efficient schemes for establishing anonymity in Clustered Wireless Sensor Networks (CWSNs). The schemes apply to a CWSN in which the nodes in a neighbourhood share pairwise keys for authentic and confidential communication. The first scheme, named Simple Anonymity Scheme (SAS), uses a range of pseudonyms as identifiers for a node in the

  20. Knowledge Networks

    ERIC Educational Resources Information Center

    McLeod, Scott

    2008-01-01

    The blogosphere and the Internet are both examples of complex, self-organizing networks. So too is the world of academic publishing. Some faculty members are prolific article and book writers. Their publications often are hubs, or even superhubs, in the scholarly literature, cited regularly by others. Some scholars might just be nodes, with…

  1. Social Networks\\

    Microsoft Academic Search

    Ahmad A. Al-Daraiseh; Afnan S. Al-Joudi; Hanan B. Al-Gahtani; Maha S. Al-Qahtani

    2014-01-01

    Privacy breaches and Identity Theft cases are increasing at an alarming rate. Social Networking Sites (SN’s) are making it worse. Facebook (FB), Twitter and other SN’s offer attackers a wide and easily accessible platform. Privacy in the Kingdom of Saudi Arabia (KSA) is extremely important due to cultural beliefs besides the other typical reasons. In this research we comprehensively cover

  2. Networked Interactivity.

    ERIC Educational Resources Information Center

    Rafaeli, Sheizaf; Sudweeks, Fay

    1997-01-01

    Proposes that a useful perspective for studying group computer-mediated communication is the theoretical construct of interactivity. Examines a representative snapshot of communication among the very large groups populating the networks. Finds that conversations are less confrontational than popularly believed: conversations are more helpful and…

  3. Global Networking.

    ERIC Educational Resources Information Center

    Lynch, Clifford

    1997-01-01

    Discusses the state of the Internet. Highlights include the magnitude of the infrastructure, costs, its increasing pace, constraints in international links, provision of network capacity to homes and small businesses, cable television modems, political and cultural problems, the digital library concept, search engines, the failure of personal…

  4. Beyond Networking.

    ERIC Educational Resources Information Center

    Carmel, Michael

    1981-01-01

    Discusses the new relationships between libraries and their users with reference to the worldwide medical information networks which have developed through the influence of the U.S. National Library of Medicine. Consideration is given to the new roles librarians will have to assume. (Author/LLS)

  5. Networking CD-ROM.

    ERIC Educational Resources Information Center

    Jordahl, Gregory

    1993-01-01

    Discusses the use of CD-ROM networks in schools. Topics addressed include problems with networking CD-ROM, including accessing the operating system, speed, and the use of multimedia; peer-to-peer networking; client/server networking; drives, jukeboxes, and towers; and full-motion video networks. A sidebar lists CD-ROM servers. (LRW)

  6. High Performance Multimodal Networks

    Microsoft Academic Search

    Erik G. Hoel; Wee-liang Heng; Dale Honeycutt

    2005-01-01

    Networks often form the core of many users' spatial databases. Networks are used to support the rapid navigation and analysis of linearly connected data such as that found in transportation networks. Common types of analysis performed on such networks include shortest path, traveling salesman, allocation, and distance matrix computation. Network data models are usually represented as a small collection of

  7. Semantic Social Network Analysis

    Microsoft Academic Search

    Guillaume Erétéo; Fabien L. Gandon; Olivier Corby; Michel Buffa

    2009-01-01

    Social Network Analysis (SNA) tries to understand and exploit the key features of social networks in order to manage their life cycle and predict their evolution. Increasingly popular web 2.0 sites are forming huge social network. Classical methods from social network analysis (SNA) have been applied to such online networks. In this paper, we propose leveraging semantic web technologies to

  8. Ecological network analysis: network construction

    Microsoft Academic Search

    Brian D. Fath; Ursula M. Scharler; Robert E. Ulanowicz; Bruce Hannon

    2007-01-01

    Ecological network analysis (ENA) is a systems-oriented methodology to analyze within system interactions used to identify holistic properties that are otherwise not evident from the direct observations. Like any analysis technique, the accuracy of the results is as good as the data available, but the additional challenge is that the data need to characterize an entire ecosystem's flows and storages.

  9. Raj JainThe Ohio State University Networking TrendsNetworking TrendsNetworking TrendsNetworking TrendsNetworking TrendsNetworking Trends

    E-print Network

    Jain, Raj

    Raj JainThe Ohio State University 1B-1 Networking TrendsNetworking TrendsNetworking TrendsNetworking TrendsNetworking TrendsNetworking Trends Raj Jain The Ohio State University Columbus, OH 43210 Jain@CIS.Ohio-State.Edu http://www.cis.ohio-state.edu/~jain/ Future All I want you to tell me is what will be the networking

  10. Robustness of a Network of Networks

    NASA Astrophysics Data System (ADS)

    Gao, Jianxi; Buldyrev, Sergey V.; Havlin, Shlomo; Stanley, H. Eugene

    2011-11-01

    Network research has been focused on studying the properties of a single isolated network, which rarely exists. We develop a general analytical framework for studying percolation of n interdependent networks. We illustrate our analytical solutions for three examples: (i) For any tree of n fully dependent Erd?s-Rényi (ER) networks, each of average degree k¯, we find that the giant component is P?=p[1-exp?(-k¯P?)]n where 1-p is the initial fraction of removed nodes. This general result coincides for n=1 with the known second-order phase transition for a single network. For any n>1 cascading failures occur and the percolation becomes an abrupt first-order transition. (ii) For a starlike network of n partially interdependent ER networks, P? depends also on the topology—in contrast to case (i). (iii) For a looplike network formed by n partially dependent ER networks, P? is independent of n.

  11. Animal transportation networks.

    PubMed

    Perna, Andrea; Latty, Tanya

    2014-11-01

    Many group-living animals construct transportation networks of trails, galleries and burrows by modifying the environment to facilitate faster, safer or more efficient movement. Animal transportation networks can have direct influences on the fitness of individuals, whereas the shape and structure of transportation networks can influence community dynamics by facilitating contacts between different individuals and species. In this review, we discuss three key areas in the study of animal transportation networks: the topological properties of networks, network morphogenesis and growth, and the behaviour of network users. We present a brief primer on elements of network theory, and then discuss the different ways in which animal groups deal with the fundamental trade-off between the competing network properties of travel efficiency, robustness and infrastructure cost. We consider how the behaviour of network users can impact network efficiency, and call for studies that integrate both network topology and user behaviour. We finish with a prospectus for future research. PMID:25165598

  12. Air Traffic Network Project

    NASA Technical Reports Server (NTRS)

    1997-01-01

    The high level requirement of the Air Traffic Network (ATN) project is to provide a mechanism for evaluating the impact of router scheduling modifications on a networks efficiency, without implementing the modifications in the live network.

  13. Network Economics Anna Nagurney

    E-print Network

    Nagurney, Anna

    , Shipment Components, Finished Goods Communication Computers, Satellites, Telephone Exchanges Fiber Optic Performance/Efficiency Measure with Applications to a Variety of Network Systems · Transportation Network approach of using mathematical network models and algorithms to abstract decision- making focusing

  14. Advanced Computer Networks

    NSDL National Science Digital Library

    Amy Apon

    The purpose of this class will be to focus on advanced topics in computer networking. The goal of this class is to prepare students to do research in networking or cluster computing, including employment in leading edge networking positions.

  15. Network exception handlers: host-network control in enterprise networks

    Microsoft Academic Search

    Thomas Karagiannis; Richard Mortier; Antony Rowstron

    2008-01-01

    Enterprise network architecture and management have followed the Internet's design principles despite different requirements and characteristics: enterprise hosts are administered by a single authority, which intrinsically assigns different values to traffic from different business applications. We advocate a new approach where hosts are no longer relegated to the network's periphery, but actively participate in network-related decisions. To enable host participation,

  16. 78 FR 775 - Goodman Networks, Inc. Core Network Engineering (Deployment Engineering) Division Alpharetta, GA...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-01-04

    ...Goodman Networks, Inc. Core Network Engineering (Deployment Engineering...Goodman Networks, Inc. Core Network Engineering (Deployment Engineering...Goodman Networks, Inc. Core Network Engineering (Deployment...

  17. The deep space network

    NASA Technical Reports Server (NTRS)

    1977-01-01

    Presented is Deep Space Network (DSN) progress in flight project support, tracking and data acquisition (TDA) research and technology, network engineering, hardware and software implementation, and operations.

  18. The deep space network

    NASA Technical Reports Server (NTRS)

    1975-01-01

    Summaries are given of Deep Space Network progress in flight project support, tracking and data acquisition research and technology, network engineering, hardware and software implementation, and operations.

  19. Energy aware network coding in wireless networks

    E-print Network

    Shi, Xiaomeng, Ph. D. Massachusetts Institute of Technology

    2012-01-01

    Energy is one of the most important considerations in designing reliable low-power wireless communication networks. We focus on the problem of energy aware network coding. In particular, we investigate practical energy ...

  20. Network coding for robust wireless networks

    E-print Network

    Kim, MinJi, Ph. D. Massachusetts Institute of Technology

    2012-01-01

    Wireless networks and communications promise to allow improved access to services and information, ubiquitous connectivity, and mobility. However, current wireless networks are not well-equipped to meet the high bandwidth ...

  1. Green Network Planning of Single Frequency Networks

    Microsoft Academic Search

    George Koutitas

    2010-01-01

    This paper investigates the network deployment of single frequency networks (SFN) based on OFDM schemes that are standardized for terrestrial broadcasting systems, for digital audio broadcasting (DAB) and for digital video broadcasting (DVB) systems. The concept of green network planning is presented. The term `green' refers to low carbon, energy efficiency and low exposure to radiation, parameters important for the

  2. Computer Networks and Networking: A Primer.

    ERIC Educational Resources Information Center

    Collins, Mauri P.

    1993-01-01

    Provides a basic introduction to computer networks and networking terminology. Topics addressed include modems; the Internet; TCP/IP (Transmission Control Protocol/Internet Protocol); transmission lines; Internet Protocol numbers; network traffic; Fidonet; file transfer protocol (FTP); TELNET; electronic mail; discussion groups; LISTSERV; USENET;…

  3. Network Setup Vulnerability of Wireless Home Networks

    E-print Network

    Zhang, Junshan

    hacking tools Wireless home networks are a growing trend in today's world 802.11 a/b/g/n has been usedNetwork Setup Vulnerability of Wireless Home Networks Hacking into WPA Stephen G. Calvert (sgcalver tools can capture the authentication requests and use a dictionary attack to find the passphrase

  4. Efficient network camouflaging in wireless networks

    E-print Network

    Jiang, Shu

    2006-04-12

    . In this three-part dissertation we investigate techniques for providing network camouflaging services in wireless networks. In the first part, we address a specific problem in a hierarchical multi-task sensor network, i.e. hiding the links between observable...

  5. Network coded ALOHA for wireless multihop networks

    Microsoft Academic Search

    Hyun-Kwan Lee; Seong-Lyun Kim

    2009-01-01

    The purpose of this paper is to show the possibility of combining slotted ALOHA with network coding in wireless multihop networks. In particular, we focus on a star topology in which outer nodes exchange data with each other through a center node. The question is how much the throughput increases by adopting network coding at the center node. To answer

  6. O. Bonaventure, 2008Network Security/2008.2 Network Security

    E-print Network

    Bonaventure, Olivier

    © O. Bonaventure, 2008Network Security/2008.2 Network Security Olivier Bonaventure IP Networking;© O. Bonaventure, 2008Network Security/2008.2 Network security At which layer should we place the security functions ? Physical layer Physical layer Datalink Datalink NetworkNetwork Physical layer Datalink

  7. Woodland Network

    NSDL National Science Digital Library

    Willstedt, Hans.

    The Woodland Network is "an interactive environmental project for both primary and secondary schools."Available in a variety of different languages, this Web site includes the main project for secondary students, Woodland Research, along with two smaller activities for younger students. The projects are designed to allow students to collect real woodland sample data and make comparisons with data collected from other students around the world. The site includes adequate instructions and reporting forms, as well as a searchable database of submitted results.

  8. Social Networks Ulrik Brandes

    E-print Network

    Brandes, Ulrik

    26 Social Networks Ulrik Brandes University of Konstanz Linton C. Freeman University of California, Irvine Dorothea Wagner Karlsruhe Institute of Technology 26.1 Social Network Analysis 26.2 Visualization · Cohesion · Two-mode networks · Dynamics 26.4 Trends and Challenges Social networks provide a rich source

  9. Electronic Communication Networks.

    ERIC Educational Resources Information Center

    Raimondi, Sharon L.

    1984-01-01

    Discusses educational uses, types, operation, advantages, popular features, and subscription rates of electronic communication networks. Factors to consider when choosing a network are described, and a table listing networks designed for educators includes information on the network producer, target audience, features, subscription rates, and…

  10. Building Air Monitoring Networks

    ERIC Educational Resources Information Center

    Environmental Science and Technology, 1977

    1977-01-01

    The different components of air monitoring networks, the status of air monitoring in the United States, and the services and activities of the three major American network builders are detailed. International air monitoring networks and alert systems are identified, with emphasis on the Dutch air monitoring network. (BT)

  11. Towards knowledge networking

    Microsoft Academic Search

    Andreas Seufert; Georg von Krogh; Andrea Bach

    1999-01-01

    In this article we describe an integrated view on knowledge management and networking being a very powerful combination for the future of knowledge management. We start by giving an overview of the increasing importance of networks in the modern economy. Subsequently, we conceptualize a network perspective on knowledge management. Therefore we first give a theoretical foundation on networks, and secondly

  12. MONET: multiwavelength optical networking

    Microsoft Academic Search

    Richard E. Wagner; Rod C. Alferness; A. A. M. Saleh; Matthew S. Goodman

    1996-01-01

    This paper presents an overview of the multiwavelength optical networking (MONET) program and summarizes its vision. The program objective is to advance, demonstrate, and integrate network architecture and economics, advanced multiwavelength technology, and network management and control to achieve high capacity, reconfigurable, high performance, reliable multiwavelength optical networks, with scalability to national scale, for both commercial and specialized government applications.

  13. Designing Secure Library Networks.

    ERIC Educational Resources Information Center

    Breeding, Michael

    1997-01-01

    Focuses on designing a library network to maximize security. Discusses UNIX and file servers; connectivity to campus, corporate networks and the Internet; separation of staff from public servers; controlling traffic; the threat of network sniffers; hubs that eliminate eavesdropping; dividing the network into subnets; Switched Ethernet;…

  14. Network Telescopes: Technical Report

    Microsoft Academic Search

    David Moore; Colleen Shannon; Geoffrey M. Voelkery; Stefan Savagey

    A network telescope is a portion of routed IP address space in which little or no legitimate traffic exists. Monitoring unexpected traffic arriving at a network telescope provides the opportunity to view remote network security events such as various forms of flooding denial-of-service attacks, infection of hosts by Internet worms, and network scanning. In this paper, we examine the effects

  15. Automated network fault management

    Microsoft Academic Search

    J. S. Baras; M. Ball; S. Gupta; P. Viswanathan; P. Shah

    1997-01-01

    Future military communication networks will have a mixture of backbone terrestrial, satellite and wireless terrestrial networks. The speeds of these networks vary and they are very heterogeneous. As networks become faster, it is not enough to do reactive fault management. Our approach combines proactive and reactive fault management. Proactive fault management is implemented by dynamic and adaptive routing. Reactive fault

  16. Multirate Clos networks

    Microsoft Academic Search

    Jonathan S. Turner; Riccardo Melen

    2003-01-01

    Clos networks are a class of multistage switching network topologies that provide alternate paths between inputs and outputs, making it possible to minimize or eliminate the blocking that can otherwise occur in such networks. In his seminal paper in the Bell System Technical Journal in 1953, Charles Clos showed how these networks could be configured to make them nonblocking and

  17. The Logistical Networking Testbed

    Microsoft Academic Search

    Scott Atchley; Micah Beck; Jeremy Millar; Terry Moore; Jim Plank; Stephen Soltesz

    2002-01-01

    We describe the Logistical Networking Testbed, built using the Network Storage Stack, and sample applications that use the testbed. The testbed uses the Network Storage Stack, de- veloped at the University of Tennessee, which allows for flexi- ble sharing and utilization of writable storage as a network resource. The sample applications include content delivery, multimedia streaming, overlay routing, checkpointing, and

  18. Community structures in complex networks

    E-print Network

    Albert, Réka

    · Real-world network : Friendship network ­ Nodes : people ­ Edges : friendship · Communities : Group distinctive feature of real-world networks is the property of community structure. #12;Karate club friendship network #12;Scientific collaboration network #12;Communities in real-world networks · Real-world network

  19. Improved Local Coordinate Coding using Local Tangents Kai Yu kyu@sv.nec-labs.com

    E-print Network

    Zhang, Tong

    on Machine Learning, Haifa, Israel, 2010. Copyright 2010 by the author(s)/owner(s). traditional statistical America Tong Zhang tzhang@stat.rutgers.edu Rutgers University Abstract Local Coordinate Coding (LCC

  20. Reliability and Performance-aware 3D SRAM Design Mohit Pathak and Sung Kyu Lim

    E-print Network

    Lim, Sung Kyu

    results for 3D ICs based on GDSH layout. The authors show that through silicon vias can have a significant IC. To generate the layout we first determine the location of the SRAM banks. Since the size of SRAM different area and fabrication cost. TSVs can also cause reliability challenges for 3D ICs by reducing

  1. Network epidemiology and plant trade networks.

    PubMed

    Pautasso, Marco; Jeger, Mike J

    2014-01-01

    Models of epidemics in complex networks are improving our predictive understanding of infectious disease outbreaks. Nonetheless, applying network theory to plant pathology is still a challenge. This overview summarizes some key developments in network epidemiology that are likely to facilitate its application in the study and management of plant diseases. Recent surveys have provided much-needed datasets on contact patterns and human mobility in social networks, but plant trade networks are still understudied. Human (and plant) mobility levels across the planet are unprecedented-there is thus much potential in the use of network theory by plant health authorities and researchers. Given the directed and hierarchical nature of plant trade networks, there is a need for plant epidemiologists to further develop models based on undirected and homogeneous networks. More realistic plant health scenarios would also be obtained by developing epidemic models in dynamic, rather than static, networks. For plant diseases spread by the horticultural and ornamental trade, there is the challenge of developing spatio-temporal epidemic simulations integrating network data. The use of network theory in plant epidemiology is a promising avenue and could contribute to anticipating and preventing plant health emergencies such as European ash dieback. PMID:24790128

  2. Cognitive Radio Network Tomography

    Microsoft Academic Search

    Chung-Kai Yu; Kwang-Cheng Chen; Shin-Ming Cheng

    2010-01-01

    The cognitive radio network (CRN), as a promising technique in future wireless communication networks, shall execute some critical functionalities to enhance existing wireless networks, such as network reconfigurability to adaptively select networks (e.g., in IEEE P1900.4 and ETSI-RSS), spectrum opportunity utilization for transmissions over opportunistic links to enhance spectrum efficiency (e.g., in IEEE 802.22), and further cooperative relays among cognitive

  3. Electronic Neural Networks

    NASA Technical Reports Server (NTRS)

    Thakoor, Anil

    1990-01-01

    Viewgraphs on electronic neural networks for space station are presented. Topics covered include: electronic neural networks; electronic implementations; VLSI/thin film hybrid hardware for neurocomputing; computations with analog parallel processing; features of neuroprocessors; applications of neuroprocessors; neural network hardware for terrain trafficability determination; a dedicated processor for path planning; neural network system interface; neural network for robotic control; error backpropagation algorithm for learning; resource allocation matrix; global optimization neuroprocessor; and electrically programmable read only thin-film synaptic array.

  4. Psychotherapy Networker

    NSDL National Science Digital Library

    The Psychotherapy Networker website is the online presence of the print magazine, which covers "the everyday challenges of clinical practice, while also offering perspective on the social issues, critical ideas, and therapeutic innovations shaping the direction of the [psychotherapy] profession." Visitors to the site will find the full text of the "Current Issue" and the full text of "Recent Issues". Subscribers to the bimonthly magazine have full access to the "Archives". On the left side of any page is a "Popular Topics" link that has over a dozen topics, including "The Business of Therapy", "Challenging Cases", "Ethics", and "Trauma". Visitors should check out the "CE Courses" link at the top of any page as it has many types of continuing education course offerings, such as "Telecourses", "Audio Courses" and "Online Courses". There is even a "Magazine Quiz" to take that will yield two CE credits if 12 questions about designated articles are answered correctly.

  5. When Network Coding improves the Performances of Clustered Wireless Networks

    E-print Network

    Paris-Sud XI, Université de

    When Network Coding improves the Performances of Clustered Wireless Networks that significantly increases the performances of clustering algorithms in wireless multi-hop networks-XOR coding; wireless multi-hop networks; clustering I. INTRODUCTION Partitioning nodes

  6. Automatic Object Recognition Using Combinational Neural Networks in Surveillance Networks

    E-print Network

    Fan, Jeffrey

    Automatic Object Recognition Using Combinational Neural Networks in Surveillance Networks Priyanka, size, translation and rotation. In this paper, a new scheme called combination neural networks of back propagation. Keywords-Combinational Neural Networks; Feature Extraction; Back Propagation

  7. Solving stochasic PERT networks exactly using hybrid Bayesian networks

    E-print Network

    Cinicioglu, Esma N.; Shenoy, Prakash P.

    2006-09-16

    In this paper, we describe how a stochastic PERT network can be formulated as a Bayesian network. We approximate such PERT Bayesian network by mixtures of Gaussians hybrid Bayesian networks. Since there exists algorithms ...

  8. Autonomic networks and network-enabled capability

    NASA Astrophysics Data System (ADS)

    Spillings, James

    2004-07-01

    Changes in the nature of battlespace information services, combined with the drive to digitization, are raising expectations of the ability of network-centric systems to provide information throughput and timeliness. At a level often abstracted from the systems perspective, it becomes necessary to consider the nature of the underlying network and its ability to adapt, recover, and organise in the face of increasing demands and non-optimal environments. Without this consideration, it may be that the capabilities of the underlying network act to restrict the exploitation of Network-Enabled Capability. Autonomic networks and autonomic computing are being presented as a possible aid to sustaining critical infrastructures of dynamic nodes. Although the focus of much commercial activity, autonomic networks are also believed to have relevance in the military environment and, most importantly, in supporting emerging battlespace information systems and digitization initiatives. Albeit well understood in biological contexts, autonomic principles have yet to be proven in commercial technological environments and, more importantly, in the context of military demands. Derived from this, key issues relate to the true nature of autonomic networks, the benefits accruing from such networks, and those challenges compounded by increasing demands from the ongoing development of military technology and digitization trends. This paper presents an examination of the demands made by the evolution of battlespace information services, some of the applicable technologies to address those demands, and examines the state of current and emerging technology to determine the perceived nature of autonomic networks in the context of Network-Enabled Capability.

  9. Morphological neural networks

    SciTech Connect

    Ritter, G.X.; Sussner, P. [Univ. of Florida, Gainesville, FL (United States)

    1996-12-31

    The theory of artificial neural networks has been successfully applied to a wide variety of pattern recognition problems. In this theory, the first step in computing the next state of a neuron or in performing the next layer neural network computation involves the linear operation of multiplying neural values by their synaptic strengths and adding the results. Thresholding usually follows the linear operation in order to provide for nonlinearity of the network. In this paper we introduce a novel class of neural networks, called morphological neural networks, in which the operations of multiplication and addition are replaced by addition and maximum (or minimum), respectively. By taking the maximum (or minimum) of sums instead of the sum of products, morphological network computation is nonlinear before thresholding. As a consequence, the properties of morphological neural networks are drastically different than those of traditional neural network models. In this paper we consider some of these differences and provide some particular examples of morphological neural network.

  10. Biometrics for home networks security

    Microsoft Academic Search

    I. S. Ansari; A. S. Qutbuddin

    2009-01-01

    Hacking crimes committed to the home networks are increasing. Advanced network protection is not always possible for the home networks. In this paper we will study the ability of using biometric systems for authentication in home networks.

  11. Network/Services (Fiber Optics)

    E-print Network

    Hung, Shih-Hao

    Modulation Error Control Coding Signal Processing Medium Access Control Radio Resource Allocation Admission Control, Handover Protocols #12; (2) Backbone (Wired) Network Network Access Fiber Optics Tx with Side Information Another application: sensor network #12;Example: Network Organization and Radio

  12. Network sampling and classification: An investigation of network model representations

    E-print Network

    Needleman, Daniel

    : Connectivity pattern Network type Network metrics Network sampling Network classification Methods of the connectivity patterns of a network instead of on the limited set of networkmetrics for a specific network type of interactions, drive produc- tivity and other important aspects of collective behavior. A connec- tivity pattern

  13. Network Virtualization for Future Mobile Networks: General Architecture and Applications

    Microsoft Academic Search

    Marco Hoffmann; Markus Staufer

    2011-01-01

    Based on the expected future requirements this paper describes a general network architecture enabled by network virtualization. This architecture consists of three major building blocks which we call virtualized physical resources, virtual resource manager and virtual network controller. Such an architecture will facilitate network sharing deployments, which might exist in the form of network consolidation or service specific networks. Furthermore

  14. Comparison between Traditional Neural Networks and Radial Basis Function Networks

    E-print Network

    Wilamowski, Bogdan Maciej

    Comparison between Traditional Neural Networks and Radial Basis Function Networks Tiantian Xie, Hao networks: traditional neural networks and radial basis function (RBF) networks, both of which of neural network architectures are analyzed and compared based on four different examples. The comparison

  15. Network exception handlers: host-network control in enterprise networks

    Microsoft Academic Search

    Thomas Karagiannis; Richard Mortier; Antony I. T. Rowstron

    2008-01-01

    Enterprise network architecture and management have followed the Internet's design principles despite different requirements and char- acteristics: enterprise hosts are administered by a single authority, which intrinsically assigns different values to traffic from different business applications. We advocate a new approach where hosts are no longer relegated tothenetwork'speriphery, butactively participateinnetwork-related decisions. To enable host participation, network information, such as dynamic

  16. 78 FR 12359 - Goodman Networks, Inc., Core Network Engineering (Deployment Engineering) Division Including...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-02-22

    ...Goodman Networks, Inc., Core Network Engineering (Deployment Engineering...Including Workers in the Core Network Engineering (Deployment Engineering...Goodman Networks, Inc., Core Network Engineering (Deployment...

  17. (Mn{sub 1-x}Pb{sub x})Pb{sub 10+y}Sb{sub 12-y}S{sub 26-y}Cl{sub 4+y}O, a new oxy-chloro-sulfide with {approx}2 nm-spaced (Mn,Pb)Cl{sub 4} single chains within a waffle-type crystal structure

    SciTech Connect

    Doussier, Charlotte [Institut des Materiaux Jean Rouxel, UMR 6502 CNRS-Universite de Nantes, 2 rue de la Houssiniere, BP 32229, 44322 Nantes cedex 03 (France); Moelo, Yves [Institut des Materiaux Jean Rouxel, UMR 6502 CNRS-Universite de Nantes, 2 rue de la Houssiniere, BP 32229, 44322 Nantes cedex 03 (France)], E-mail: yves.moelo@cnrs-imn.fr; Leone, Philippe; Meerschaut, Alain [Institut des Materiaux Jean Rouxel, UMR 6502 CNRS-Universite de Nantes, 2 rue de la Houssiniere, BP 32229, 44322 Nantes cedex 03 (France)

    2007-08-15

    The new oxy-chloro-sulfide (Mn{sub 1-x}Pb{sub x})Pb{sub 10+y}Sb{sub 12-y}S{sub 26-y}Cl{sub 4+y}O (x element of [0.2-0.3]; y element of [0.3-1.6]) was synthesized by dry way at 500-600 deg. C. A single crystal {approx}Mn{sub 0.7}Pb{sub 11.0}Sb{sub 11.3}S{sub 25.3}Cl{sub 4.7}O indicates a monoclinic symmetry, space group C2/m, with a = 37.480(8), b 4.1178(8), c = 18.167(4) A, {beta} = 106.37(3){sup o}, V = 2690.2(9) A{sup 3}, Z = 2. Its crystal structure was determined by X-ray single crystal diffraction, with a final R = 5.11%. Modular analysis of the crystal structure reveals a 'waffle' architecture, where complex rods with lozenge section delimitate an internal channel filled by a single chain of (Mn{sub 0.7}Pb{sub 0.3})Cl{sub 6} octahedra connected by opposite edges. Minimal inter-chain distances are close to 18 A. The rod wall, two-atom thick, presents, in alternation with S atoms, Pb or (Pb,Sb) cations with prismatic coordination in the internal atom layer, while the external atom layer is constituted exclusively by Sb cations with dissymmetric square pyramidal coordination. A (Pb,Sb){sub 2}S{sub 2} fragment connects two successive rods along (2 0 1) to form a waffle-type palissadic layer. The unique O position, half filled, presents the same environment than the isolated O positions in the oxy-sulfide Pb{sub 14}Sb{sub 30}S{sub 54}O{sub 5}, or oxy-chloro-sulfides Pb{sub 18}Sb{sub 20}S{sub 46}Cl{sub 2}O and (Cu,Ag){sub 2}Pb{sub 21}Sb{sub 23}S{sub 55}ClO. This compound belongs to a pseudo-homologous series of chalcogenides with waffle structure, ordered according to the size of their lozenge shape channel. Such a complex senary compound of the oxy-chloro-sulfide type illustrates the structural competition between three cations, on one hand, and, on the other hand, three anions. This compound is of special interest regarding the 1D distribution of magnetic Mn{sup 2+} atoms at the {approx}2 nm scale. - Graphical abstract: Projection of the crystal structure of (Mn{sub 1-x}Pb{sub x})Pb{sub 10+y}Sb{sub 12-y}S{sub 26-y}Cl{sub 4+y}O restricted to two adjacent rods, showing the minimum distance between (Mn, Pb)Cl{sub 4} single chains.

  18. Influence of the divalent and trivalent ions substitution on the structural and magnetic properties of Mg0.5-xCdxCo0.5Cr0.04TbyFe1.96-yO4 ferrites prepared by sol-gel method

    NASA Astrophysics Data System (ADS)

    Mustafa, Ghulam; Islam, M. U.; Zhang, Wenli; Anwar, Abdul Waheed; Jamil, Yasir; Murtaza, Ghulam; Ali, Ihsan; Hussain, Mudassar; Ali, Akbar; Ahmad, Mukhtar

    2015-08-01

    A series of the divalent and trivalent co-substituted Mg0.5-xCdxCo0.5Cr0.04TbyFe1.96-yO4 spinel ferrite systems (where x=0-0.5 in steps of 0.1 and y=0.00-0.10 in steps 0.02) are synthesized by sol-gel auto combustion method. The product materials were characterized by the thermo gravimetric analysis and differential scanning calorimetry (TGA/DSC), Fourier transform infrared spectra (FTIR), nitrogen adsorption (BET), X-ray diffraction (XRD), scanning electron microscope (SEM), atomic force microscopy (AFM) and vibrating sample magnetometer (VSM). The X-ray diffraction patterns and Fourier transform infrared spectroscopy confirm spinel nanocrystalline phase. The crystallite size is determined by Scherer's formula from 36.6 to 69.4 nm. The X-ray density is found in the range of 5.09-6.43 (g/cm3). The morphological features are studied using scanning electron microscope and AFM. Saturation magnetization (Ms) and remanence (Mr) magnetization extracted from M-H loops exhibit the decreasing trends 21.4-16 emu/g and 9.1-6.3 emu/g, respectively. A significant decrease in the intrinsic parameters is observed in the prepared samples due to the weakening of the A-B interaction as iron enters into the tetrahedral A-site. The coercivity lies in the range of 300-869 Oe as a function of co-substitution contents. The coercivity of the sample with x=0.1, y=0.02 was found maximum i.e. 869 Oe. The obtained results suggest that the investigated materials may be potential candidates for high density recording media applications.

  19. Sensor networks Opportunities for theory

    E-print Network

    Feigenbaum, Joan

    Sensor networks Opportunities for theory The future Sensor Networks and the Future of Networked Computation James Aspnes Yale University February 16th, 2006 ToNC workshop, February 16th, 2006 Sensor Networks and the Future of Networked Computation #12;Sensor networks Opportunities for theory The future

  20. Projecting FCAPS to Active Networks

    Microsoft Academic Search

    R. Boutaba; A. Polyrakis

    2001-01-01

    Active Networks is one of the most promising and discussed trends in the area of Computer Networks. It allows us to program the network nodes to perform advanced operations and computations, and thus, control their behavior. These properties change considerably the scenery in the area of computer networks and, consequently, affect Network Management. Indeed, Active Networks do not only open

  1. Wireless LAN network management system

    Microsoft Academic Search

    Harry Li; Guangjing Chen

    2004-01-01

    The objective of this paper is to analyze and implement a network management system (NMS) in wireless environment using simple network management protocol (SNMP). Wired network management technology is matured and effective in today's complexity network tasks. But with the popularity of mobile devices, management of wireless network is becoming critical. Because of the significant differences between wireless network and

  2. Social network visualization in epidemiology

    Microsoft Academic Search

    Nicholas A. Christakis; James H. Fowler

    2009-01-01

    Epidemiological investigations and interventions are increasingly focusing on social networks. Two aspects of social networks are relevant in this regard: the structure of networks and the function of networks. A better understanding of the processes that determine how networks form and how they operate with respect to the spread of behavior holds promise for improving public health. Visualizing social networks

  3. Network Plus

    NASA Astrophysics Data System (ADS)

    Bender, Walter; Chesnais, Pascal

    1988-05-01

    Over the past several years, the Electronic Publishing Group at the MIT Media Laboratory has been conducting a family of media experiments which explore a new kind of broadcast: the distribution of data and computer programs rather than pre-packaged material. This broadcast is not directed to a human recipient, but to a local computational agent acting on his behalf. In response to instructions from both the broadcaster and the reader, this agent selects from the incoming data and presents it in a manner suggestive of traditional media. The embodiment of these media experiments is a news retrieval system where the news editor has been replaced by the personal computer. A variety of both local and remote databases which operate passively as well as interac-tively are accessed by "reporters." These "reporters" are actually software interfaces, which are programmed to gather news. Ideally, they are "broadcatching" that is to say, watching all broadcast television channels, listening to all radio transmissions, and reading all newspapers, magazines, and journals. 1 A possible consequence of the synthesis of media through active processing is the merger of newspapers and television (figure 1). The result is either a newspaper with illustrations which move 2 or, conversely, print as television output. The latter is the theme of Network Plus.

  4. Teachers Network

    NSDL National Science Digital Library

    Based in New York, the Teachers Network is an alliance of education professionals dedicated to disseminating best-practices throughout the world of public school education. On the homepage, visitors can click through a selection of lesson plans, essays by current teachers on their own experiences, and also read a list of grants available to those working in a number of disciplines, including social studies, language arts, and the sciences. The â??How Toâ? area is one that will be most helpful to new teachers, as it provides resources on managing a classroom, working with studentsâ?? families, and teaching literacy. The lesson plans area includes a nice search feature which allows users to search by subject and grade level, along with offering them the option to view the most popular teacher-created lesson plans. Some of these favorites include â??What Makes a Good Friend?â? and â??Breads Around the Worldâ?. For educators and those with an interest in researching the realm of curriculum and instruction, this website is a real find.

  5. Network Security and Contagion

    E-print Network

    Acemoglu, Daron

    2013-06-28

    We develop a theoretical model of security investments in a network of interconnected agents. Network connections introduce the possibility of cascading failures due to an exogenous or endogenous attack depending on the ...

  6. Concurrency and network disassortativity.

    PubMed

    Khor, Susan

    2010-01-01

    The relationship between a network's degree-degree correlation and a loose version of graph coloring is studied on networks with broad degree distributions. We find that, given similar conditions on the number of nodes, number of links, and clustering levels, fewer colors are needed to color disassortative than assortative networks. Since fewer colors create fewer independent sets, our finding implies that disassortative networks may have higher concurrency potential than assortative networks. This in turn suggests another reason for the disassortative mixing pattern observed in biological networks such as those of protein-protein interaction and gene regulation. In addition to the functional specificity and stability suggested by Maslov and Sneppen, a disassortative network topology may also enhance the ability of cells to perform crucial tasks concurrently. Hence, increased concurrency may also be a driving force in the evolution of biological networks. PMID:20586579

  7. The deep space network

    NASA Technical Reports Server (NTRS)

    1977-01-01

    The facilities, programming system, and monitor and control system for the deep space network are described. Ongoing planetary and interplanetary flight projects are reviewed, along with tracking and ground-based navigation, communications, and network and facility engineering.

  8. The deep space network

    NASA Technical Reports Server (NTRS)

    1977-01-01

    A Deep Space Network progress report is presented dealing with in flight project support, tracking and data acquisition research and technology, network engineering, hardware and software implementation, and operations.

  9. Networking and Institutional Planning.

    ERIC Educational Resources Information Center

    Riggs, Donald E.

    1987-01-01

    Explores the impact of networks and shared library resources on the library planning process. Environmental scanning techniques, the need for cooperative planning, and the formulation of strategies to achieve networking goals are discussed. (CLB)

  10. Using Neural Networks

    E-print Network

    Gabel, S.

    A neural network approach is employed for estimating key efficiency parameters in a gas turbine engine. The concept is demonstrated within a limited operating region for a given engine. The neural network is developed to estimate certain...

  11. Time and Citation Networks

    E-print Network

    Clough, James R

    2015-01-01

    Citation networks emerge from a number of different social systems, such as academia (from published papers), business (through patents) and law (through legal judgements). A citation represents a transfer of information, and so studying the structure of the citation network will help us understand how knowledge is passed on. What distinguishes citation networks from other networks is time; documents can only cite older documents. We propose that existing network measures do not take account of the strong constraint imposed by time. We will illustrate our approach with two types of causally aware analysis. We apply our methods to the citation networks formed by academic papers on the arXiv, to US patents and to US Supreme Court judgements. We show that our tools can reveal that citation networks which appear to have very similar structure by standard network measures turn out to have significantly different properties. We interpret our results as indicating that many papers in a bibliography were not directly...

  12. The deep space network

    NASA Technical Reports Server (NTRS)

    1979-01-01

    Progress is reported in flight project support, tracking and data acquisition research and technology, network engineering, hardware and software implementation, and operations. The functions and facilities of the Deep Space Network are emphasized.

  13. The deep space network

    NASA Technical Reports Server (NTRS)

    1980-01-01

    The functions and facilities of the Deep Space Network are considered. Progress in flight project support, tracking and data acquisition research and technology, network engineering, hardware and software implementation, and operations is reported.

  14. Infinite dynamic bayesian networks

    E-print Network

    Doshi-Velez, Finale P.

    We present the infinite dynamic Bayesian network model (iDBN), a nonparametric, factored state-space model that generalizes dynamic Bayesian networks (DBNs). The iDBN can infer every aspect of a DBN: the number of hidden ...

  15. Connectibles : tangible social networking

    E-print Network

    Kalanithi, Jeevan James

    2007-01-01

    This thesis presents "Connectibles," an instantiation of a tangible social network, a new type of social network application rooted in physical objects and real world social behavior. This research is inspired by social ...

  16. Optimization of Communication Networks

    Microsoft Academic Search

    Jörg Eberspächer; Moritz Kiese; Roland Wessäly

    \\u000a Global communication networks (e.g. telephone networks, cellular radio networks, or the Internet) have become the nervous\\u000a system of today’s economy and society. Due to ongoing technological progress in electronics, computer and communication technologies,\\u000a not only the number of users in the networks keeps growing, but new applications like radio and TV in the Internet, e-business,\\u000a and interactive games are upcoming.

  17. Local network assessment

    NASA Astrophysics Data System (ADS)

    Glen, D. V.

    1985-04-01

    Local networks, related standards activities of the Institute of Electrical and Electronics Engineers the American National Standards Institute and other elements are presented. These elements include: (1) technology choices such as topology, transmission media, and access protocols; (2) descriptions of standards for the 802 local area networks (LAN's); high speed local networks (HSLN's) and military specification local networks; and (3) intra- and internetworking using bridges and gateways with protocols Interconnection (OSI) reference model. The convergence of LAN/PBX technology is also described.

  18. Optical neural networks

    SciTech Connect

    Caulfield, H.J. (Univ. of Alabama, Center for Applied Optics, Huntsville, AL (US)); Kinser, J. (Teledyne Brown Engineering, Huntsville, AL (USA). Systems Div.); Rogers, S.K. (Air Force Inst. of Tech., Wright-Patterson AFB, OH (USA))

    1989-10-01

    Classical optical information processing and classical neural networks can be mutually adapted to create optical neural networks which offer significant and fundamental advantages over electronic neural networks in various well-defined cases. The authors present a systematic morphology of optical neural networks, a discussion of special problems they create, an indication of the state of the art in their implementation, and some supportable speculations on their future.

  19. Tuned analog network

    NASA Technical Reports Server (NTRS)

    Kleinberg, L. L. (inventor)

    1983-01-01

    A noninverting, direct current amplifier stage is cascaded into an integrator stage to form a two stage tuned network with a single input junction common to both stages. The network provides independent adjustment of center frequency, bandwidth and voltage gain. The insertion of a positive feedback loop between the stages provides a very narrow bandwidth network. The addition of back to back zener diodes between the common input node and ground converts the network into an oscillator.

  20. yoU Totally Aware Phone:...............817-272-3381

    E-print Network

    Texas at Arlington, University of

    hormone and was abused by body builders until banned in 1991by the FDA. Taken alone or especially when into the end of a soda straw, can be coated, flavored, and produce a 10 hour high. China White--is 6,000 times

  1. Como Lo Hago Yo: Tratamiento Quirurgico Del Mielomeningocele

    PubMed Central

    Portillo, Santiago

    2014-01-01

    En Argentina hay plan de fortificación con ácido fólico. Diagnostico prenatal no siempre es correcto. Cierre según técnica. Cerramos músculo. No favorecemos corpectomía temprana en casos de cifosis. Suturamos la plaqueta. Cerramos el plano muscular. Hidrocefalia: Válvula de derivación, generalmente dentro de los dos primeros meses. Ventriculostomía no está indicada. Chiari II. Laminectomia cervical alta. Siringomielia: Derivación desde la cavidad al peritoneo. PMID:24791219

  2. Que Culpa Tengo Yo? Performing Identity and College Teaching.

    ERIC Educational Resources Information Center

    Aleman, Ana M. Martinez

    1999-01-01

    Discusses ways that college faculty educate for an enriched public conversation, examining how a bicultural identity can decenter normatives, suggesting alternative models for understanding and thinking, and arguing that faculty whose intelligence has been formed by the experiences of concomitant cultural exile and naturalization are experts in…

  3. Doing Shakespeare: "Yo! A Hit! A Very Palpable Hit!"

    ERIC Educational Resources Information Center

    O'Brien, Peggy

    1993-01-01

    Describes the realities of current state of the teaching of William Shakespeare in U.S. schools. Compares these realities with the philosophy of teaching of the Folger Shakespeare Library in Washington, DC. Shows how the Folger Library's education program resonates with their proclaimed philosophy. (HB)

  4. "Yo Soy Voluntaria": Volunteering in a Dual-Language School.

    ERIC Educational Resources Information Center

    Rubio, Olga G.

    1995-01-01

    Focuses on parental participation in the educational process as a means of building and maintaining close relationships between parents and the school. The patterns of volunteering in the school and the ways that parents used these opportunities, not only to benefit the school and the community, but to improve their own lives are discussed. (GR)

  5. Doing Shakespeare. Yo! A Hit! A Very Palpable Hit!

    ERIC Educational Resources Information Center

    O'Brien, Peggy

    1996-01-01

    Describes the work of Peggy O'Brien and the Folger Shakespeare Library's Summer Institute. The Institute works with upper level secondary students helping them prepare scenes and performances of Shakespeare's works. Discusses some of the lessons learned during this process. (MJP)

  6. Emergent Network Defense

    ERIC Educational Resources Information Center

    Crane, Earl Newell

    2013-01-01

    The research problem that inspired this effort is the challenge of managing the security of systems in large-scale heterogeneous networked environments. Human intervention is slow and limited: humans operate at much slower speeds than networked computer communications and there are few humans associated with each network. Enabling each node in the…

  7. A Network Security Monitor

    Microsoft Academic Search

    L. Todd Herberlein; Gihan V. Dias; Karl N. Levitt; Biswanath Mukherjee; Jeff Wood; David Wolber

    1990-01-01

    This study concentrates on the security-related issues in a single broadcast LAN (local area network) such as Ethernet. The authors formalize various possible network attacks. Their basic strategy is to develop profiles of usage of network resources and then compare current usage patterns with the historical profile to determine possible security violations. Thus, the work is similar to the host-based

  8. Dissertation Network Architectures

    E-print Network

    Carle, Georg

    system employs onion routing to secure the resulting indirect connections. Materially to this design, we of unrestricted length for onion routes through the network. Analyzing Tor and implementing this attack gave us Routing in Open Networks Nathan S. Evans Network Architectures and Services Department of Computer Science

  9. TKN Telecommunication Networks Group

    E-print Network

    Wichmann, Felix

    requires far too many mes- sages for a low power, long lived sensor network. In this paper, we examine how of the observed process. If the sampled process is free of noise the maximum sampling interval is given. But the network capacity is much smaller, and depends on the energy constraints and network size. As a rough

  10. Multiaccess Radio Network Enviroments

    Microsoft Academic Search

    Dimitris E. Charilas; A. D. Panagopoulous

    2010-01-01

    Nowadays there is a plethora of independent radio access technologies (RATs), each supporting distinct coverage, mobility, data rates, and quality of service (QoS). The cornerstone of all visions on future wireless networks is that there will be a multiaccess network environment, where users will be able to select from various available multiple heterogeneous access networks the most appropriate one to

  11. Querying Network Directories

    Microsoft Academic Search

    H. V. Jagadish; Laks V. S. Lakshmanan; Tova Milo; Divesh Srivastava; Dimitra Vista

    1999-01-01

    Hierarchically structured directories have recently proliferatedwith the growth of the Internet, and are being usedto store not only address books and contact information forpeople, but also personal profiles, network resource information,and network and service policies. These systems providea means for managing scale and heterogeneity, whileallowing for conceptual unity and autonomy across multipledirectory servers in the network, in a way far

  12. Twitter: Network properties analysis

    Microsoft Academic Search

    Abraham Ronel Martínez Teutle

    2010-01-01

    Online Social Networks have had a fast growing since the popularization of Web 2.0. This kind of networks provides the basis to find and maintain social relationships with users having diverse interests as well as a current picture of things happening around them. The analysis of the graph structure is necessary to understand the impact of online social networks among

  13. Diffusive neural network

    Microsoft Academic Search

    Gaetano L. Aiello

    2002-01-01

    A non-connectionist model of a neuronal network based on passive diffusion of neurotransmitters is presented as an alternative to hard-wired artificial neural networks. Classic thermodynamical approach shows that the diffusive network is capable of exhibiting asymptotic stability and a dynamics resembling that of a chaotic system. Basic computational capabilities of the net are discussed based on the equivalence with a

  14. Future Optical Networks

    Microsoft Academic Search

    Michael J. O'Mahony; Christina Politi; Dimitrios Klonidis; Reza Nejabati; Dimitra Simeonidou

    2006-01-01

    This paper presents views on the future of optical networking. A historical look at the emergence of optical networking is first taken, followed by a discussion on the drivers pushing for a new and pervasive network, which is based on photonics and can satisfy the needs of a broadening base of residential, business, and scientific users. Regional plans and targets

  15. Dissertation Network Architectures

    E-print Network

    Carle, Georg

    Dissertation Network Architectures and Services NET 2011-06-1 Strategic Resource Management-937201-21-1 ISSN 1868-2634 (print) ISSN 1868-2642 (electronic) Network Architectures and Services NET-2011 in computer networks. Resource Management during Denial-of-Service Attacks During a denial-of-service (Do

  16. Plug into a Network.

    ERIC Educational Resources Information Center

    Vander Linden, Doug; Clark, Larry

    1994-01-01

    Stand-alone, single-user software programs for classroom use can be prohibitively expensive, compared to information-sharing network systems. Based on a Kansas district's experience, this article explains three types of networks (device-sharing, operating-system-based, and client-server-based) and discusses network protocols, software choices,…

  17. Calibrating Distributed Camera Networks

    Microsoft Academic Search

    Dhanya Devarajan; Zhaolin Cheng; Richard J. Radke

    2008-01-01

    Recent developments in wireless sensor networks have made feasible distributed camera networks, in which cameras and processing nodes may be spread over a wide geographical area, with no centralized processor and limited ability to communicate a large amount of information over long distances. This paper overviews distributed algorithms for the calibration of such camera networks- that is, the automatic estimation

  18. Network medicine Tony Pawsona

    E-print Network

    Minireview Network medicine Tony Pawsona , Rune Lindingb,* a Samuel Lunenfeld Research Institute strategies can be imple- mented. Transforming medicine into a network driven endeavour will require or through disease states. We term this ap- proach, network medicine. Ó 2008 Federation of European

  19. Detecting Attacks on Networks

    Microsoft Academic Search

    Chris Herringshaw

    1997-01-01

    As Internet based and intranet based network systems have evolved, they have become invaluable tools that businesses can use to share information and conduct business with online partners. However, hackers have also learned to use these systems to access private networks and their resources. Studies have shown that many organizations have suffered external and internal network intrusions. Internet systems are

  20. Mobile Ad hoc Networking

    Microsoft Academic Search

    Carlos de Morais Cordeiro; Dharma P. Agrawal

    2002-01-01

    Recent advances in portable computing and wireless technologies are opening up exciting possibilities for the future of wireless mobile networking. A Mobile Ad hoc NETwork (MANET) consists of mobile platforms which are free to move arbitrarily. This is in contrast with the topology of the existing Internet, where the router topology is essentially static (barring network configuration or router failures).

  1. Information network architectures

    NASA Technical Reports Server (NTRS)

    Murray, N. D.

    1985-01-01

    Graphs, charts, diagrams and outlines of information relative to information network architectures for advanced aerospace missions, such as the Space Station, are presented. Local area information networks are considered a likely technology solution. The principle needs for the network are listed.

  2. UMTS network architecture

    NASA Astrophysics Data System (ADS)

    Katoen, J. P.; Saiedi, A.; Baccaro, I.

    1994-05-01

    This paper proposes a Functional Architecture and a corresponding Network Architecture for the Universal Mobile Telecommunication System (UMTS). Procedures like call handling, location management, and handover are considered. The architecture covers the domestic, business, and public environments. Integration with existing and forthcoming networks for fixed communications is anticipated and the Intelligent Network (IN) philosophy is applied.

  3. Network game traffic modelling

    Microsoft Academic Search

    Johannes Färber

    2002-01-01

    A significant share of today's Internet traffic is generated by network gaming. This kind of traffic is interesting in regard to it's market potential as well as to it's real time requirements on the network. For the consideration of game traffic in network dimensioning, traffic models are required that allow to generate a characteristic load for analytical or simulative performance

  4. Mobile Networks and Applications

    E-print Network

    Chen, Min

    11036-010-0260-8 Body Area Networks: A Survey #12;1 23 Your article is protected by copyright and all) 16:171­193 DOI 10.1007/s11036-010-0260-8 Body Area Networks: A Survey Min Chen · Sergio Gonzalez · body area networks · survey 1 Introduction Recently, there has been increasing interest from re

  5. Computational Verb Neural Networks

    Microsoft Academic Search

    Tao Yang

    2007-01-01

    When any attribute value in a conventional neural network is verbified, the result is a computational verb neural network(VNN). We can verbify inputs, outputs, biases, weights and many other attributes of conventional neural networks. In this paper, we reported two types of VNNs. The first one consists of computational verb inputs and numerical output. The second one consists of computational

  6. Electronic neural networks

    SciTech Connect

    Howard, R.E.; Jackel, L.D.; Graf, H.P.

    1988-02-01

    The use of electronic neural networks to handle some complex computing problems is discussed. A simple neural model is shown and discussed in terms of its computational aspects. The use of electronic neural networks in machine pattern recognition and classification and in machine learning is examined. CMOS programmable networks are discussed. 15 references.

  7. Monte Carlo Sensor Networks

    Microsoft Academic Search

    Thomas C. Henderson; Brandt Erickson; Travis Longoria; Edward Grant; Kyle Luthy; Leonardo Mattos; Matt Craver

    2005-01-01

    Biswas et al. (1) introduced a probabilistic approach to inference with limited information in sensor networks. They represented the sensor network as a Bayesian network and performed approximate inference using Markov Chain Monte Carlo (MCMC). The goal is to robustly answer queries even under noisy or partial information scenarios. We propose an alter- native method based on simple Monte Carlo

  8. Computational sensor networks

    Microsoft Academic Search

    Thomas C. Henderson; Christopher A. Sikorski; Edward Grant; Kyle Luthy

    2007-01-01

    We propose Computational Sensor Networks as a methodology to exploit models of physical phe- nomena in order to better understand the structure of the sensor network. To do so, it is necessary to relate changes in the sensed variables (e.g., temperature) to the aspect of interest in the sensor network (e.g., sensor node position, sensor bias, etc.), and to develop

  9. Aeronautical ad hoc networks

    Microsoft Academic Search

    Ehssan Sakhaee; Abbas Jamalipour; Nei Kato

    2006-01-01

    There has been an enormous growth in mobile ad hoc networks (MANETs) in land based small to medium size networks with relatively strict power and resources. In this paper the concept of ad hoc networking between aircraft is introduced, which can be considered as a novel approach in increasing the data rate and practicality of future in-flight broadband Internet access.

  10. Generalized classifier neural network.

    PubMed

    Ozyildirim, Buse Melis; Avci, Mutlu

    2013-03-01

    In this work a new radial basis function based classification neural network named as generalized classifier neural network, is proposed. The proposed generalized classifier neural network has five layers, unlike other radial basis function based neural networks such as generalized regression neural network and probabilistic neural network. They are input, pattern, summation, normalization and output layers. In addition to topological difference, the proposed neural network has gradient descent based optimization of smoothing parameter approach and diverge effect term added calculation improvements. Diverge effect term is an improvement on summation layer calculation to supply additional separation ability and flexibility. Performance of generalized classifier neural network is compared with that of the probabilistic neural network, multilayer perceptron algorithm and radial basis function neural network on 9 different data sets and with that of generalized regression neural network on 3 different data sets include only two classes in MATLAB environment. Better classification performance up to %89 is observed. Improved classification performances proved the effectivity of the proposed neural network. PMID:23298551

  11. Introduction to Telecommunications Networks

    NSDL National Science Digital Library

    Snyder, Gordon F.

    This page from Delmar Learning provides more information about the book "Introduction To Telecommunications Networks" by Gordon F. Snyder of the ICT Center. The book includes information on the history of the public switched telephone network, electronics, public and private telecommunications networks and other related information. Users may order the book via this website. A link is also provided to request a review copy.

  12. Social Networks and Adaptation.

    ERIC Educational Resources Information Center

    Cohen, Carl I.; And Others

    In a longitudinal study of the network characteristics that assist elderly individuals to meet their needs, as well as the effects of change in four categories of social network dimensions (social interaction, network structure, member attribute, environmental attribute), 133 elderly residents of 18 midtown Manhattan single room occupancy (SRO)…

  13. Neural Network Ensembles

    Microsoft Academic Search

    Lars Kai Hansen; Peter Salamon

    1990-01-01

    Several means for improving the performance and training of neural networks for classification are proposed. Crossvalidation is used as a tool for optimizing network parameters and architecture. It is shown that the remaining residual generalization error can be reduced by invoking ensembles of similar networks

  14. Internet2 Network

    NSDL National Science Digital Library

    Internet2 provides the U.S. research and education community with a dynamic, innovative and cost-effective hybrid optical and packet network. The network was designed to provide next-generation production services as well as a platform for the development of new networking ideas and protocols.

  15. Complex Networks Mark Jelasity

    E-print Network

    Jelasity, Márk

    -trivial network ­ Other networks Social relationships, food web, chemical reactions (DNA), etc Complex self important (not only interesting) ­ WWW, Internet, food web, metabolic nets, etc Some common aspects must of network depending on its structure ­ Design and engineering need to understand emergent properties

  16. Multimedia Networks: Mission Impossible?

    ERIC Educational Resources Information Center

    Weiss, Andrew M.

    1996-01-01

    Running multimedia on a network, often difficult because of the memory and processing power required, is becoming easier thanks to new protocols and products. Those developing network design criteria may wish to consider making use of Fast Ethernet, Asynchronous Transfer Method (ATM), switches, "fat pipes", additional network segmentation, and…

  17. Global Supply Chain Networks Electric Power Networks

    E-print Network

    Nagurney, Anna

    in part by NSF Grant No.:IIS-0002647 AT&T Industrial Ecology Fellowship This support is gratefully Global Supply Chain Network Model under Risk and Uncertainty Euler Method Numerical Example Motivation Research Global Supply Chain Network Model under Risk and Uncertainty Euler Method Numerical Example Global

  18. Parental Social Network and Child's Friendship Network.

    ERIC Educational Resources Information Center

    Uhlendorff, Harald; Oswald, Hans

    This study analyzed the relation between the friendship networks of parents and the peer networks of their children. Subjects were 255 second- through fifth-grade children of an inner-city primary school in the western part of Berlin, Germany, who were interviewed about friends. In the interview, children were asked to name other children with…

  19. CONSTRUCTING DEAL NETWORKS: BROKERS AS NETWORK \\

    Microsoft Academic Search

    TIMOTHY G. POLLOCK

    We introduce the concept of the network architect to extend theory explaining how brokers create and manage structural holes in mediated markets. We argue that a broker's social resources and dependence on the market, along with exogenous deal conditions, influence the broker's motivations and willingness to make tradeoffs between long-term and short-term considerations when constructing deal networks. We develop our

  20. Electro-Magnetic Earthquake Bursts and Critical Rupture of Peroxy Bond Networks in Rocks

    E-print Network

    F. Freund; D. Sornette

    2006-05-07

    We propose a mechanism for the low frequency electromagnetic emissions and other electromagnetic phenomena which have been associated with earthquakes. The mechanism combines the critical earthquake concept and the concept of crust acting as a charging electric battery under increasing stress. The electric charges are released by activation of dormant charge carriers in the oxygen anion sublattice, called peroxy bonds or positive hole pairs (PHP), where a PHP represents an $O_3X/^{OO}\\backslash YO_3$ with $X,Y = Si^{4+}, Al^{3+}...$, i.e. an $O^-$ in a matrix of $O^{2-}$ of silicates. We propose that PHP are activated by plastic deformations during the slow cooperative build-up of stress and the increasingly correlated damage culminating in a large ``critical'' earthquake. Recent laboratory experiments indeed show that stressed rocks form electric batteries which can release their charge when a conducting path closes the equivalent electric circuit. We conjecture that the intermittent and erratic occurrences of EM signals are a consequence of the progressive build-up of the battery charges in the Earth crust and their erratic release when crack networks are percolating throughout the stressed rock volumes, providing a conductive pathway for the battery currents to discharge. EM signals are thus expected close to the rupture, either slightly before or after, that is, when percolation is most favored.

  1. An algebraic approach to network coding

    Microsoft Academic Search

    Ralf Koetter; Muriel Médard

    2003-01-01

    We take a new look at the issue of network capacity. It is shown that network coding is an essential ingredient in achieving the capacity of a network. Building on recent work by Li et al., who examined the network capacity of multicast networks, we extend the network coding framework to arbitrary networks and robust networking. For networks which are

  2. El Conocimiento Ocupacional y del Yo para los Grupos Especiales. Monografias sobre el Conocimiento Ocupacional y del Yo.

    ERIC Educational Resources Information Center

    Hoyt, Kenneth B.

    This Spanish translation of ED 132 428 includes the three papers representing Office of Education attempts to face the need for improving delivery of career education to special portions of the population. New additions are brief sections on basic definitions and additional considerations of the significance of work. The first paper, on career…

  3. Coping with the abstract and complex nature of genetics in biology education : The yo-yo learning and teaching strategy

    Microsoft Academic Search

    M. C. P. J. Knippels

    2002-01-01

    This thesis describes a research project that was carried out at the Centre for Science and Mathematics Education at Utrecht University between 1998 and 2002. The study addresses problems in learning and teaching genetics in upper secondary biology education. The aim of the study is to develop a theoretically founded and empirically tested learning and teaching strategy (LT strategy) to

  4. Networks Technology Conference

    NASA Technical Reports Server (NTRS)

    Tasaki, Keiji K. (editor)

    1993-01-01

    The papers included in these proceedings represent the most interesting and current topics being pursued by personnel at GSFC's Networks Division and supporting contractors involved in Space, Ground, and Deep Space Network (DSN) technical work. Although 29 papers are represented in the proceedings, only 12 were presented at the conference because of space and time limitations. The proceedings are organized according to five principal technical areas of interest to the Networks Division: Project Management; Network Operations; Network Control, Scheduling, and Monitoring; Modeling and Simulation; and Telecommunications Engineering.

  5. Networks in Cognitive Science

    E-print Network

    Baronchelli, Andrea; Pastor-Satorras, Romualdo; Chater, Nick; Christiansen, Morten H

    2013-01-01

    Networks of interconnected nodes have long played a key role in cognitive science, from artificial neural networks to spreading activation models of semantic memory. Recently, however, a new Network Science has been developed, providing insights into the emergence of global, system-scale properties in contexts as diverse as the Internet, metabolic reactions or collaborations among scientists. Today, the inclusion of network theory into cognitive sciences, and the expansion of complex systems science, promises to significantly change the way in which the organization and dynamics of cognitive and behavioral processes are understood. In this paper, we review recent contributions of network theory at different levels and domains within the cognitive sciences.

  6. Network Characterization Service (NCS)

    SciTech Connect

    Jin, Guojun; Yang, George; Crowley, Brian; Agarwal, Deborah

    2001-06-06

    Distributed applications require information to effectively utilize the network. Some of the information they require is the current and maximum bandwidth, current and minimum latency, bottlenecks, burst frequency, and congestion extent. This type of information allows applications to determine parameters like optimal TCP buffer size. In this paper, we present a cooperative information-gathering tool called the network characterization service (NCS). NCS runs in user space and is used to acquire network information. Its protocol is designed for scalable and distributed deployment, similar to DNS. Its algorithms provide efficient, speedy and accurate detection of bottlenecks, especially dynamic bottlenecks. On current and future networks, dynamic bottlenecks do and will affect network performance dramatically.

  7. Networks consolidation program

    NASA Technical Reports Server (NTRS)

    Yeater, M. L.; Herrman, D. T.

    1981-01-01

    A single consolidated network of ground tracking stations to replace the present two ground-based spacecraft tracking networks is proposed. The proposed consolidated network uses facilities that are now included in the Ground Spaceflight Tracking and Data Network (GSTDN), operated by Goddard Space Flight (GSFC), as well as the existing Deep Space Network (DSN), operated by Jet Propulsion Laboratory (JPL). These facilities are combined and modified to provide a consolidated network managed and operated by JPL and capable of supporting the set of planetary and Highly Elliptical Earth Orbiter (HEEO) missions planned for the Tracking and Data Relay Satellite System (TDRSS) era. The consolidated network is planned to be operational after the TDRSS becomes operational. It will continue to support planetary missions that are now supported by the DSN and also provide support to a broad class of other spacecraft missions which are not compatible with or which, for other reasons, cannot be supported by the TDRSS.

  8. Satellite networks for education.

    NASA Technical Reports Server (NTRS)

    Singh, J. P.; Morgan, R. P.; Rosenbaum, F. J.

    1972-01-01

    Consideration of satellite-based educational networking. The characteristics and structure of networks are reviewed, and pressures within the educational establishment that are providing motivation for various types of networks are discussed. A number of studies are cited in which networking needs for educational sectors and services are defined. The current status of educational networking for educational radio and television, instructional television fixed services, inter- and intrastate educational communication networks, computer networks, cable television for education, and continuing and proposed educational experiments using NASA's Applications Technology Satellites is reviewed. Possible satellite-based educational telecommunication services and three alternatives for implementing educational satellite systems are described. Some remarks are made concerning public policy aspects of future educational satellite system development.

  9. Network topology analysis.

    SciTech Connect

    Kalb, Jeffrey L.; Lee, David S.

    2008-01-01

    Emerging high-bandwidth, low-latency network technology has made network-based architectures both feasible and potentially desirable for use in satellite payload architectures. The selection of network topology is a critical component when developing these multi-node or multi-point architectures. This study examines network topologies and their effect on overall network performance. Numerous topologies were reviewed against a number of performance, reliability, and cost metrics. This document identifies a handful of good network topologies for satellite applications and the metrics used to justify them as such. Since often multiple topologies will meet the requirements of the satellite payload architecture under development, the choice of network topology is not easy, and in the end the choice of topology is influenced by both the design characteristics and requirements of the overall system and the experience of the developer.

  10. Percolation on Sparse Networks

    NASA Astrophysics Data System (ADS)

    Karrer, Brian; Newman, M. E. J.; Zdeborová, Lenka

    2014-11-01

    We study percolation on networks, which is used as a model of the resilience of networked systems such as the Internet to attack or failure and as a simple model of the spread of disease over human contact networks. We reformulate percolation as a message passing process and demonstrate how the resulting equations can be used to calculate, among other things, the size of the percolating cluster and the average cluster size. The calculations are exact for sparse networks when the number of short loops in the network is small, but even on networks with many short loops we find them to be highly accurate when compared with direct numerical simulations. By considering the fixed points of the message passing process, we also show that the percolation threshold on a network with few loops is given by the inverse of the leading eigenvalue of the so-called nonbacktracking matrix.

  11. Mutually connected component of networks of networks with replica nodes

    NASA Astrophysics Data System (ADS)

    Bianconi, Ginestra; Dorogovtsev, Sergey N.; Mendes, José F. F.

    2015-01-01

    We describe the emergence of the giant mutually connected component in networks of networks in which each node has a single replica node in any layer and can be interdependent only on its replica nodes in the interdependent layers. We prove that if, in these networks, all the nodes of one network (layer) are interdependent on the nodes of the same other interconnected layer, then, remarkably, the mutually connected component does not depend on the topology of the network of networks. This component coincides with the mutual component of the fully connected network of networks constructed from the same set of layers, i.e., a multiplex network.

  12. Social Network Current State of Social Network in terms of

    E-print Network

    Gunes, Mehmet Hadi

    Social Network Analysis Current State of Social Network in terms of public data availability #12;Agenda · Introduction · Related Work · My project · Conclusion #12;Popularity of Social Network #12;Popularity of Social Network Survey Social networking sites and our lives by Pew Internet 47% of American

  13. POWER SYSTEM NETWORK TOPOLOGY PROCESSING BASED ON ARTIFICIAL NEURAL NETWORKS

    Microsoft Academic Search

    D. M. VINOD KUMAR; S. C. SRIVASTAVA

    1998-01-01

    In this paper, a new approach for the determination of power system network topology based on Artificial Neural Networks (ANN) has been suggested. For the determination of power system network topology, three models of ANN based on Multilayer perceptron using Backpropagation Algorithm (BPA), Functional Link Network (FLN) and Counterpropagation Network (CPN) have been utilized and tested for both noisy as

  14. Assess model of network security based on analytic network process

    Microsoft Academic Search

    Jiang-Neng Yi; Wei-Dong Meng; Wei-Min Ma; Jin-Jun Du

    2005-01-01

    In order to assess the safe coefficient of a computer network more scientifically, as well as to change expert's appraisal suggestion on the network security into theoretical direction of network's development and maintenance, we introduce the analytic network process (ANP) into computer network safety assessment field and set up the assess model based on ANP. Also, we compare the evaluation

  15. Projecting advanced enterprise network and service management to active networks

    Microsoft Academic Search

    Raouf Boutaba; Andreas Polyrakis

    2002-01-01

    Active networks is a promising technology that allows us to control the behavior of network nodes by programming them to perform advanced operations and computations. Active networks are changing considerably the scenery of computer networks and, consequently, affect the way network management is conducted. Current management techniques can be enhanced and their efficiency can be improved, while novel techniques can

  16. Introduction to Network Science 1 Percolation and Network Resilience

    E-print Network

    Safro, Ilya

    Introduction to Network Science 1 Percolation and Network Resilience Percolation is a process;Introduction to Network Science 3 j is on and its k neighbors are not in gc Reminder: excess degree to exist #12;Introduction to Network Science 4 #12;Introduction to Network Science 5 #12;Introduction

  17. Introduction to Network Science 16 Introduction to Network Science 17

    E-print Network

    Safro, Ilya

    Introduction to Network Science 16 l = s+t+1 #12;Introduction to Network Science 17 http://complexnt.blogspot.com #12;Introduction to Network Science 18 Generating Functions and Degree Distributions #12;Introduction to Network Science 19 Polylogarithm drawn values add to a specific sum s #12;Introduction to Network Science

  18. Flow-based XOR Network Coding for Lossy Wireless Networks

    E-print Network

    Wu, Jie

    1 Flow-based XOR Network Coding for Lossy Wireless Networks Abdallah Khreishah, Issa M. Khalil, Pouya Ostovari, and Jie Wu Abstract--A practical way for maximizing the throughput of a wireless network. We also extend our 2-hop relay networks results to multihop wireless networks by providing a linear

  19. EFFICIENT NETWORK CAMOUFLAGING IN WIRELESS NETWORKS A Dissertation

    E-print Network

    Vaidya, Nitin

    EFFICIENT NETWORK CAMOUFLAGING IN WIRELESS NETWORKS A Dissertation by SHU JIANG Submitted CAMOUFLAGING IN WIRELESS NETWORKS A Dissertation by SHU JIANG Submitted to the Office of Graduate Studies ABSTRACT Efficient Network Camouflaging in Wireless Networks. (December 2005) Shu Jiang, B.E., University

  20. On optimizing low SNR wireless networks using network coding

    E-print Network

    Médard, Muriel

    On optimizing low SNR wireless networks using network coding Mohit Thakur Institute networks with low SNR is investigated. While the capacity in the limit of disappearing SNR per degree in low SNR wireless network with given node locations that use network coding over flows. The model we

  1. Network Motifs: Simple Building Blocks of Complex Networks

    Microsoft Academic Search

    R. Milo; S. Shen-Orr; S. Itzkovitz; N. Kashtan; D. Chklovskii; U. Alon

    2002-01-01

    Complex networks are studied across many fields of science. To uncover their structural design principles, we defined ``network motifs,'' patterns of interconnections occurring in complex networks at numbers that are significantly higher than those in randomized networks. We found such motifs in networks from biochemistry, neurobiology, ecology, and engineering. The motifs shared by ecological food webs were distinct from the

  2. Using the Network Description Language in Optical Networks

    Microsoft Academic Search

    Jeroen Van Der Ham; Paola Grosso; Ronald Van Der Pol; Andree Toonk; Cees T. A. M. De Laat

    2007-01-01

    Current research networks allow end users to build their own application-specific connections (lightpaths) and optical private networks (OPNs). This requires a clear communication between the requesting application and the network. The network description language (NDL) is a vocabulary designed to describe optical networks based on the resource description framework (RDF). These descriptions aid applications in querying the capabilities of the

  3. Organization of complex networks

    NASA Astrophysics Data System (ADS)

    Kitsak, Maksim

    Many large complex systems can be successfully analyzed using the language of graphs and networks. Interactions between the objects in a network are treated as links connecting nodes. This approach to understanding the structure of networks is an important step toward understanding the way corresponding complex systems function. Using the tools of statistical physics, we analyze the structure of networks as they are found in complex systems such as the Internet, the World Wide Web, and numerous industrial and social networks. In the first chapter we apply the concept of self-similarity to the study of transport properties in complex networks. Self-similar or fractal networks, unlike non-fractal networks, exhibit similarity on a range of scales. We find that these fractal networks have transport properties that differ from those of non-fractal networks. In non-fractal networks, transport flows primarily through the hubs. In fractal networks, the self-similar structure requires any transport to also flow through nodes that have only a few connections. We also study, in models and in real networks, the crossover from fractal to non-fractal networks that occurs when a small number of random interactions are added by means of scaling techniques. In the second chapter we use k-core techniques to study dynamic processes in networks. The k-core of a network is the network's largest component that, within itself, exhibits all nodes with at least k connections. We use this k-core analysis to estimate the relative leadership positions of firms in the Life Science (LS) and Information and Communication Technology (ICT) sectors of industry. We study the differences in the k-core structure between the LS and the ICT sectors. We find that the lead segment (highest k-core) of the LS sector, unlike that of the ICT sector, is remarkably stable over time: once a particular firm enters the lead segment, it is likely to remain there for many years. In the third chapter we study how epidemics spread though networks. Our results indicate that a virus is more likely to infect a large area of a network if it originates at a node contained within k-core of high index k.

  4. Quarternary oxide phases Ln4- xA4+ xCo 2+ yAl 2- yO 15: The structures of Nd 3.43Ba 4.42Co 2.23Al 1.77O 15 and Y 2Sr 6Co 2.08Al 1.92O 15

    NASA Astrophysics Data System (ADS)

    Lee, J. Y.; Swinnea, J. S.; Steinfink, H.

    1991-12-01

    The crystal structure of two compounds having the generic formula Ln4- xA4+ xCo 2+ yAl 2- yO 15 has been determined. Nd 3.43Ba 4.42(1)Co(Co 1.23(6)Al 1.77)O 15 (compound I), Mr = 1520.96, hexagonal, P6 3mc, a = 11.544(1) Å, c = 6.912(1) Å, V = 797.7(2) Å3, Z = 2, D x = 6.33 g cm-3, MoK? ? = 0.71069 Å, ? 1 = 242.0 cm-1; R = 0.045 for 758 reflections >5 ?( F). Y 2Sr 6Co(Co 1.08(6)Al 1.92)O 15 (compound II), Mr = 1118.00, hexagonal, P6 3mc, a = 11.199(2) Å, c = 6.664(1) Å, V = 723.8(4) Å3, Z = 2, D x = 5.13 g cm-3, MoK ? ? = 0.71069 Å, ? 1 = 317.5 cm-1; R = 0.076 for 373 reflections >6 ?( F). The structure consists of clusters formed by a Co-oxygen octahedron that shares three corners of a triangular face with three separate {Co}/{Al}- oxygen tetrahedra leading to a cluster formula [ Co VI( {Co}/{Al}) IV3]O 15. The tetrahedral interstice is randomly occupied by Co 3+ and Al 3+ ions. The octahedral interstice is occupied by Co whose valence is 2+ in compound I and 3 + in II. Two such clusters exist in the unit cell and they are joined by rare earth-alkaline earth cations in 6-fold (octahedral), 8-fold (bisdisphenoid), 10-fold (capped trigonal prism), and 12-fold (cubic close packed) coordination to the oxygen ions. The octahedral cation positions are randomly occupied by about equal amounts of Nd?Ba and Y?Sr, respectively. Phase I forms with Pr and Gd but not with La, Y, or Er, restricting its formation to lanthanide ionic radii between 1.14 and 1.06 Å.

  5. Set separation Neural Network paradigms

    E-print Network

    Chen, Yiling

    Neural Net The inputs Set separation Neural Network paradigms Designing a neural network for forecasting financial time series 29 f´evrier 2008 Designing a neural network for forecasting financial time series #12;Neural Net The inputs Set separation Neural Network paradigms What a Neural Network is ? Each

  6. Free space optical wireless network

    Microsoft Academic Search

    Vincent W. S. Chan; Irwin Jacobs; Claude E. Shannon

    2011-01-01

    This talk explore an over the air optical wireless network and to create a network architecture for reliable high data rate free space optical networks that can interoperate with traditional wired and fiber networks. These networks will have significant impact for applications between ships, airborne vehicles, satellites and land-based cloud computing and data centres as an integrated high speed information

  7. Scheduling of networked control systems

    Microsoft Academic Search

    G. C. Walsh; Hong Ye

    2001-01-01

    The defining characteristic of a networked control system (NCS) is having one or more control loops closed via a serial communication channel. Typically, when the words networking and control are used together, the focus is on the control of networks, but in this article our intent is nearly inverse, not control of networks but control through networks. NCS design objectives

  8. Educational Computer Networks: An Overview.

    ERIC Educational Resources Information Center

    Crume, Charles E.; Maddux, Cleborne D.

    1990-01-01

    Describes the growth of educational computer networks in three main categories: (1) networks for sharing peripheral equipment; (2) networks for exchanging information; and (3) networks for addressing instructional needs. The use of microcomputers and mainframe computers is examined, networks in public schools and universities are described, and…

  9. Wireless networks self engineering engine

    Microsoft Academic Search

    Hee Lee; S. Djoko; Hua Jiang; S. Subramanian; K. Basu

    1999-01-01

    Each wireless network system has its own unique operating conditions. The geographical characteristics, RF conditions, call traffic and subscriber mobility of one network are different from others. In order to achieve maximum capacity and optimal performance of a network, the system parameters of the network must be engineered to fit the network's operating conditions. However, because of the complexity of

  10. Neural Networks Perceptrons and Backpropagation

    E-print Network

    Bremen, Universität

    Neural Networks Perceptrons and Backpropagation Silke Bussen-Heyen Universit¨at Bremen Fachbereich 3 5th of Novemeber 2012 Neural Networks 1 / 17 #12;Contents 1 Introduction 2 Units 3 Network structure 4 Singlelayer feed-forward neural network 5 Multilayer feed-forward neural network 6

  11. Keyword Extraction Using Language Network

    Microsoft Academic Search

    Jianyi Liu; Jinghua Wang

    2007-01-01

    In this paper, we introduced language network and described three kinds of networks. Keyword extraction is an important technology in many areas of document processing. In particularly, a keyword extraction algorithm based on language network and PageRank is proposed. Firstly a semantic network for a single document is build, then Pagerank is applied in the network to decide on the

  12. Cognitive Network Neuroscience.

    PubMed

    Medaglia, John D; Lynall, Mary-Ellen; Bassett, Danielle S

    2015-08-01

    Network science provides theoretical, computational, and empirical tools that can be used to understand the structure and function of the human brain in novel ways using simple concepts and mathematical representations. Network neuroscience is a rapidly growing field that is providing considerable insight into human structural connectivity, functional connectivity while at rest, changes in functional networks over time (dynamics), and how these properties differ in clinical populations. In addition, a number of studies have begun to quantify network characteristics in a variety of cognitive processes and provide a context for understanding cognition from a network perspective. In this review, we outline the contributions of network science to cognitive neuroscience. We describe the methodology of network science as applied to the particular case of neuroimaging data and review its uses in investigating a range of cognitive functions including sensory processing, language, emotion, attention, cognitive control, learning, and memory. In conclusion, we discuss current frontiers and the specific challenges that must be overcome to integrate these complementary disciplines of network science and cognitive neuroscience. Increased communication between cognitive neuroscientists and network scientists could lead to significant discoveries under an emerging scientific intersection known as cognitive network neuroscience. PMID:25803596

  13. Weighted multiplex networks.

    PubMed

    Menichetti, Giulia; Remondini, Daniel; Panzarasa, Pietro; Mondragón, Raúl J; Bianconi, Ginestra

    2014-01-01

    One of the most important challenges in network science is to quantify the information encoded in complex network structures. Disentangling randomness from organizational principles is even more demanding when networks have a multiplex nature. Multiplex networks are multilayer systems of [Formula: see text] nodes that can be linked in multiple interacting and co-evolving layers. In these networks, relevant information might not be captured if the single layers were analyzed separately. Here we demonstrate that such partial analysis of layers fails to capture significant correlations between weights and topology of complex multiplex networks. To this end, we study two weighted multiplex co-authorship and citation networks involving the authors included in the American Physical Society. We show that in these networks weights are strongly correlated with multiplex structure, and provide empirical evidence in favor of the advantage of studying weighted measures of multiplex networks, such as multistrength and the inverse multiparticipation ratio. Finally, we introduce a theoretical framework based on the entropy of multiplex ensembles to quantify the information stored in multiplex networks that would remain undetected if the single layers were analyzed in isolation. PMID:24906003

  14. Collaborative learning in networks

    PubMed Central

    Mason, Winter; Watts, Duncan J.

    2012-01-01

    Complex problems in science, business, and engineering typically require some tradeoff between exploitation of known solutions and exploration for novel ones, where, in many cases, information about known solutions can also disseminate among individual problem solvers through formal or informal networks. Prior research on complex problem solving by collectives has found the counterintuitive result that inefficient networks, meaning networks that disseminate information relatively slowly, can perform better than efficient networks for problems that require extended exploration. In this paper, we report on a series of 256 Web-based experiments in which groups of 16 individuals collectively solved a complex problem and shared information through different communication networks. As expected, we found that collective exploration improved average success over independent exploration because good solutions could diffuse through the network. In contrast to prior work, however, we found that efficient networks outperformed inefficient networks, even in a problem space with qualitative properties thought to favor inefficient networks. We explain this result in terms of individual-level explore-exploit decisions, which we find were influenced by the network structure as well as by strategic considerations and the relative payoff between maxima. We conclude by discussing implications for real-world problem solving and possible extensions. PMID:22184216

  15. Southwestern Ontario Medical Education Network Southwestern Ontario Medical Education Network

    E-print Network

    Lennard, William N.

    Southwestern Ontario Medical Education Network SWOMEN Southwestern Ontario Medical Education Network SWOMEN Contact: Charlotte Sikatori, Southwestern Ontario Medical Education Network (SWOMEN, Pathology, Respirology, Plastic Surgery, Oncology, and ENT. There are many more ­ please feel free

  16. Delay Tolerant Networking for Sensor Networks Max Loubser

    E-print Network

    - bility and transmission status reports. Wireless Sensor Networks (WSNs) are often viewed as challenged networks as nodes operate at low power, often with weak or intermittent radio communication. WSNs Network simulator . . . . . . . . . . . . . . . . . . . . . . 16 2.5 Survey of related work

  17. Efficient network camouflaging in wireless networks 

    E-print Network

    Jiang, Shu

    2006-04-12

    Camouflaging is about making something invisible or less visible. Network camouflaging is about hiding certain traffic information (e.g. traffic pattern, traffic flow identity, etc.) from internal and external eavesdroppers such that important...

  18. Investigating the validity of current network analysis on static conglomerate networks by protein network stratification

    Microsoft Academic Search

    Minlu Zhang; Long J. Lu

    2010-01-01

    BACKGROUND: A molecular network perspective forms the foundation of systems biology. A common practice in analyzing protein-protein interaction (PPI) networks is to perform network analysis on a conglomerate network that is an assembly of all available binary interactions in a given organism from diverse data sources. Recent studies on network dynamics suggested that this approach might have ignored the dynamic

  19. Compressive Network Analysis

    PubMed Central

    Jiang, Xiaoye; Yao, Yuan; Liu, Han; Guibas, Leonidas

    2014-01-01

    Modern data acquisition routinely produces massive amounts of network data. Though many methods and models have been proposed to analyze such data, the research of network data is largely disconnected with the classical theory of statistical learning and signal processing. In this paper, we present a new framework for modeling network data, which connects two seemingly different areas: network data analysis and compressed sensing. From a nonparametric perspective, we model an observed network using a large dictionary. In particular, we consider the network clique detection problem and show connections between our formulation with a new algebraic tool, namely Randon basis pursuit in homogeneous spaces. Such a connection allows us to identify rigorous recovery conditions for clique detection problems. Though this paper is mainly conceptual, we also develop practical approximation algorithms for solving empirical problems and demonstrate their usefulness on real-world datasets. PMID:25620806

  20. Visualizing Social Networks

    NASA Astrophysics Data System (ADS)

    Correa, Carlos D.; Ma, Kwan-Liu

    With today‘s ubiquity and popularity of social network applications, the ability to analyze and understand large networks in an efficient manner becomes critically important. However, as networks become larger and more complex, reasoning about social dynamics via simple statistics is not a feasible option. To overcome these limitations, we can rely on visual metaphors. Visualization nowadays is no longer a passive process that produces images from a set of numbers. Recent years have witnessed a convergence of social network analytics and visualization, coupled with interaction, that is changing the way analysts understand and characterize social networks. In this chapter, we discuss the main goal of visualization and how different metaphors are aimed towards elucidating different aspects of social networks, such as structure and semantics. We also describe a number of methods where analytics and visualization are interwoven towards providing a better comprehension of social structure and dynamics.

  1. MSAT network architecture

    NASA Technical Reports Server (NTRS)

    Davies, N. G.; Skerry, B.

    1990-01-01

    The Mobile Satellite (MSAT) communications system will support mobile voice and data services using circuit switched and packet switched facilities with interconnection to the public switched telephone network and private networks. Control of the satellite network will reside in a Network Control System (NCS) which is being designed to be extremely flexible to provide for the operation of the system initially with one multi-beam satellite, but with capability to add additional satellites which may have other beam configurations. The architecture of the NCS is described. The signalling system must be capable of supporting the protocols for the assignment of circuits for mobile public telephone and private network calls as well as identifying packet data networks. The structure of a straw-man signalling system is discussed.

  2. Expert networks in CLIPS

    NASA Technical Reports Server (NTRS)

    Hruska, S. I.; Dalke, A.; Ferguson, J. J.; Lacher, R. C.

    1991-01-01

    Rule-based expert systems may be structurally and functionally mapped onto a special class of neural networks called expert networks. This mapping lends itself to adaptation of connectionist learning strategies for the expert networks. A parsing algorithm to translate C Language Integrated Production System (CLIPS) rules into a network of interconnected assertion and operation nodes has been developed. The translation of CLIPS rules to an expert network and back again is illustrated. Measures of uncertainty similar to those rules in MYCIN-like systems are introduced into the CLIPS system and techniques for combining and hiring nodes in the network based on rule-firing with these certainty factors in the expert system are presented. Several learning algorithms are under study which automate the process of attaching certainty factors to rules.

  3. Modelling macromolecular networks: two meetings

    E-print Network

    Carbone, Alessandra

    for identifying the dynamics of macromolecular interactions, the morphodynamics of biologi- cal structures networks, where interactions mostly involve enzy- matic proteins and small molecules or metabolites protein­ protein interaction networks and genetic networks, where regulatory proteins interact with promoter

  4. Factors influencing bus network design

    E-print Network

    Loh, Zhen Xiang Kenneth

    2014-01-01

    Bus network design and frequency setting, the highest level subproblems in the bus planning process, have long-term impacts on bus network performance. Improving network performance not only improves the attractiveness of ...

  5. Enhancing network robustness via shielding

    E-print Network

    Zhang, Jianan, S.M. Massachusetts Institute of Technology

    2014-01-01

    Shielding critical links enhances network robustness and provides a new way of designing robust networks. We first consider shielding critical links to guarantee network connectivity after any failure under geographical ...

  6. The Gaussian parallel relay network

    Microsoft Academic Search

    B. Schein; R. Gallager

    2000-01-01

    We introduce the real, discrete-time Gaussian parallel relay network. This simple network is theoretically important in the context of network information theory. We present upper and lower bounds to capacity and explain where they coincide

  7. Modeling and Control Interactive Networks

    E-print Network

    Amin, S. Massoud

    Modeling and Control of Complex Interactive Networks By Massoud Amin E nergy, telecommunications complex networks, geographi- cally dispersed, nonlinear, and interacting both among themselves, distributed, highly interactive networks, nor does any such entity have the ability to evaluate, monitor

  8. Network operating system

    NASA Technical Reports Server (NTRS)

    1985-01-01

    Long-term and short-term objectives for the development of a network operating system for the Space Station are stated. The short-term objective is to develop a prototype network operating system for a 100 megabit/second fiber optic data bus. The long-term objective is to establish guidelines for writing a detailed specification for a Space Station network operating system. Major milestones are noted. Information is given in outline form.

  9. Molecular ecological network analyses

    PubMed Central

    2012-01-01

    Background Understanding the interaction among different species within a community and their responses to environmental changes is a central goal in ecology. However, defining the network structure in a microbial community is very challenging due to their extremely high diversity and as-yet uncultivated status. Although recent advance of metagenomic technologies, such as high throughout sequencing and functional gene arrays, provide revolutionary tools for analyzing microbial community structure, it is still difficult to examine network interactions in a microbial community based on high-throughput metagenomics data. Results Here, we describe a novel mathematical and bioinformatics framework to construct ecological association networks named molecular ecological networks (MENs) through Random Matrix Theory (RMT)-based methods. Compared to other network construction methods, this approach is remarkable in that the network is automatically defined and robust to noise, thus providing excellent solutions to several common issues associated with high-throughput metagenomics data. We applied it to determine the network structure of microbial communities subjected to long-term experimental warming based on pyrosequencing data of 16?S rRNA genes. We showed that the constructed MENs under both warming and unwarming conditions exhibited topological features of scale free, small world and modularity, which were consistent with previously described molecular ecological networks. Eigengene analysis indicated that the eigengenes represented the module profiles relatively well. In consistency with many other studies, several major environmental traits including temperature and soil pH were found to be important in determining network interactions in the microbial communities examined. To facilitate its application by the scientific community, all these methods and statistical tools have been integrated into a comprehensive Molecular Ecological Network Analysis Pipeline (MENAP), which is open-accessible now (http://ieg2.ou.edu/MENA). Conclusions The RMT-based molecular ecological network analysis provides powerful tools to elucidate network interactions in microbial communities and their responses to environmental changes, which are fundamentally important for research in microbial ecology and environmental microbiology. PMID:22646978

  10. Survivable WDM Mesh Networks

    Microsoft Academic Search

    S. Ramamurthy; Laxman Sahasrabuddhe; Biswanath Mukherjee

    2003-01-01

    Abstract, In a wavelength-division-muliplexing (WDM) optical network, the failure of network elements (e. g., fiber links and cross connects) may cause the failure of several optical channels, thereby leading to large data losses. This study examines different approaches to protect a mesh-based WDM optical network from such failures. These approaches are based on two survivability paradigms: 1) path protection\\/restoration and

  11. Solving Playground Network Problems

    NSDL National Science Digital Library

    Exploratorium

    2010-01-01

    In this activity, learners use cooperation and logical thinking to find solutions to network problems on the playground. Learners act both as computer routers, figuring out with each other how to effectively get data to the place it's being sent, and as the actual data, because the learners travel various edges of a network to get to their destination or "home" point. Learners use geometry skills to determine the most efficient routes in the network.

  12. Mission Critical Networking

    SciTech Connect

    Eltoweissy, Mohamed Y.; Du, David H.C.; Gerla, Mario; Giordano, Silvia; Gouda, Mohamed; Schulzrinne, Henning; Youssef, Moustafa

    2010-06-01

    Mission-Critical Networking (MCN) refers to networking for application domains where life or livelihood may be at risk. Typical application domains for MCN include critical infrastructure protection and operation, emergency and crisis intervention, healthcare services, and military operations. Such networking is essential for safety, security and economic vitality in our complex world characterized by uncertainty, heterogeneity, emergent behaviors, and the need for reliable and timely response. MCN comprise networking technology, infrastructures and services that may alleviate the risk and directly enable and enhance connectivity for mission-critical information exchange among diverse, widely dispersed, mobile users.

  13. Exploring complex networks

    NASA Astrophysics Data System (ADS)

    Strogatz, Steven H.

    2001-03-01

    The study of networks pervades all of science, from neurobiology to statistical physics. The most basic issues are structural: how does one characterize the wiring diagram of a food web or the Internet or the metabolic network of the bacterium Escherichia coli? Are there any unifying principles underlying their topology? From the perspective of nonlinear dynamics, we would also like to understand how an enormous network of interacting dynamical systems - be they neurons, power stations or lasers - will behave collectively, given their individual dynamics and coupling architecture. Researchers are only now beginning to unravel the structure and dynamics of complex networks.

  14. Telestroke network fundamentals.

    PubMed

    Meyer, Brett C; Demaerschalk, Bart M

    2012-10-01

    The objectives of this manuscript are to identify key components to maintaining the logistic and/or operational sustainability of a telestroke network, to identify best practices to be considered for assessment and management of acute stroke when planning for and developing a telestroke network, to show practical steps to enable progress toward implementing a telestroke solution for optimizing acute stroke care, to incorporate evidence-based practice guidelines and care pathways into a telestroke network, to emphasize technology variables and options, and to propose metrics to use when determining the performance, outcomes, and quality of a telestroke network. PMID:22885074

  15. Evolving mortal networks

    NASA Astrophysics Data System (ADS)

    Slater, Jennifer L.; Hughes, Barry D.; Landman, Kerry A.

    2006-06-01

    We discuss a class of models for the evolution of tree networks in which new nodes are recruited into the network at random times, and nodes already in the network may die at random times. Stochastic mechanisms for growth and death of the network that are either sensitive or insensitive to the coordination number or degree of nodes are studied using simulations and mean-field approximations. Critical behavior is observed in the long-time coordination number distribution of the system; associated exponents are universal in one part of parameter space, but depend on the ratio of birth and death parameters elsewhere.

  16. Competing edge networks

    NASA Astrophysics Data System (ADS)

    Parsons, Mark; Grindrod, Peter

    2012-06-01

    We introduce a model for a pair of nonlinear evolving networks, defined over a common set of vertices, subject to edgewise competition. Each network may grow new edges spontaneously or through triad closure. Both networks inhibit the other's growth and encourage the other's demise. These nonlinear stochastic competition equations yield to a mean field analysis resulting in a nonlinear deterministic system. There may be multiple equilibria; and bifurcations of different types are shown to occur within a reduced parameter space. This situation models competitive communication networks such as BlackBerry Messenger displacing SMS; or instant messaging displacing emails.

  17. Topics in neural networks

    SciTech Connect

    Petsche, T.

    1988-01-01

    Some aspects of the behavior of several neural networks are considered. The original Hopfield Associative Memory (HAM) is examined, and a lower bound on the number of spurious minima is derived when the stored memories are orthogonal. Two locally interconnected variations of the basic HAM network are proposed in which the maximum distance between two neurons that can be connected is upper bounded by B. It is shown that for such locally interconnected networks containing N neurons, if B/N {yields} 0 as N {yields} {infinity} then the capacity of the network is determined by B and is independent of N. A macroscopic-analysis technique first proposed by Amari for networks with random, nonsymmetric connection weights is modified to show that HAMs must have either one or two macroscopic stable states. The analysis and simulations show that the macroscopic behavior of networks with symmetric and nonsymmetric connections are qualitatively similar. A new class of neural networks derived from the trellis-graph representation of a convolutional code is proposed. Such a network can be viewed as a collection of winner-take-all networks interconnected to reflect the structure of the trellis graph.

  18. Recent Advances in Wireless Networking

    Microsoft Academic Search

    Upkar Varshney

    2000-01-01

    After discussing advances in wired networking in a previous column (see ibid., p.107-9, April 2000), I now turn to advances in wireless networking. Wireless networks can include everything from cellular, personal communications system (PCS), and Group System for Mobile communications (GSM) networks to wireless LANs, satellite-based networks, and fixed wireless networks. Many of these technologies have experienced significant growth lately

  19. Neural networks for aircraft control

    NASA Technical Reports Server (NTRS)

    Linse, Dennis

    1990-01-01

    Current research in Artificial Neural Networks indicates that networks offer some potential advantages in adaptation and fault tolerance. This research is directed at determining the possible applicability of neural networks to aircraft control. The first application will be to aircraft trim. Neural network node characteristics, network topology and operation, neural network learning and example histories using neighboring optimal control with a neural net are discussed.

  20. Constrained randomization of weighted networks.

    PubMed

    Ansmann, Gerrit; Lehnertz, Klaus

    2011-08-01

    We propose a Markov chain method to efficiently generate surrogate networks that are random under the constraint of given vertex strengths. With these strength-preserving surrogates and with edge-weight-preserving surrogates we investigate the clustering coefficient and the average shortest path length of functional networks of the human brain as well as of the International Trade Networks. We demonstrate that surrogate networks can provide additional information about network-specific characteristics and thus help interpreting empirical weighted networks. PMID:21929060

  1. Network of Networks and the Climate System

    NASA Astrophysics Data System (ADS)

    Kurths, Jürgen; Boers, Niklas; Bookhagen, Bodo; Donges, Jonathan; Donner, Reik; Malik, Nishant; Marwan, Norbert; Stolbova, Veronika

    2013-04-01

    Network of networks is a new direction in complex systems science. One can find such networks in various fields, such as infrastructure (power grids etc.), human brain or Earth system. Basic properties and new characteristics, such as cross-degree, or cross-betweenness will be discussed. This allows us to quantify the structural role of single vertices or whole sub-networks with respect to the interaction of a pair of subnetworks on local, mesoscopic, and global topological scales. Next, we consider an inverse problem: Is there a backbone-like structure underlying the climate system? For this we propose a method to reconstruct and analyze a complex network from data generated by a spatio-temporal dynamical system. This technique is then applied to 3-dimensional data of the climate system. We interpret different heights in the atmosphere as different networks and the whole as a network of networks. This approach enables us to uncover relations to global circulation patterns in oceans and atmosphere. The global scale view on climate networks offers promising new perspectives for detecting dynamical structures based on nonlinear physical processes in the climate system. This concept is applied to Indian Monsoon data in order to characterize the regional occurrence of strong rain events and its impact on predictability. References: Arenas, A., A. Diaz-Guilera, J. Kurths, Y. Moreno, and C. Zhou, Phys. Reports 2008, 469, 93. Donges, J., Y. Zou, N. Marwan, and J. Kurths, Europhys. Lett. 2009, 87, 48007. Donner, R., Y. Zou, J. Donges, N. Marwan, and J. Kurths, Phys. Rev. E 2010, 81, 015101(R ). Mokhov, I. I., D. A. Smirnov, P. I. Nakonechny, S. S. Kozlenko, E. P. Seleznev, and J. Kurths, Geophys. Res. Lett. 2011, 38, L00F04. Malik, N., B. Bookhagen, N. Marwan, and J. Kurths, Climate Dynamics, 2012, 39, 971. Donges, J., H. Schultz, N. Marwan, Y. Zou, J. Kurths, Eur. J. Phys. B 2011, 84, 635-651. Donges, J., R. Donner, M. Trauth, N. Marwan, H.J. Schellnhuber, and J. Kurths, PNAS 2011, 108, 20422-20427. Runge, J. , J. Heitzig, V. Petoukhov, J. Kurths, Phys. Rev. Lett. 2012, 108, 258701.

  2. How random are complex networks

    E-print Network

    Orsini, Chiara; Jamakovic, Almerima; Mahadevan, Priya; Colomer-de-Simón, Pol; Vahdat, Amin; Bassler, Kevin E; Toroczkai, Zoltán; Boguñá, Marián; Caldarelli, Guido; Fortunato, Santo; Krioukov, Dmitri

    2015-01-01

    Represented as graphs, real networks are intricate combinations of order and disorder. Fixing some of the structural properties of network models to their values observed in real networks, many other properties appear as statistical consequences of these fixed observables, plus randomness in other respects. Here we employ the $dk$-series, a complete set of basic characteristics of the network structure, to study the statistical dependencies between different network properties. We consider six real networks---the Internet, US airport network, human protein interactions, technosocial web of trust, English word network, and an fMRI map of the human brain---and find that many important local and global structural properties of these networks are closely reproduced by $dk$-random graphs whose degree distributions, degree correlations, and clustering are as in the corresponding real network. We discuss important conceptual, methodological, and practical implications of this evaluation of network randomness.

  3. Comparative analysis of collaboration networks

    SciTech Connect

    Progulova, Tatiana; Gadjiev, Bahruz [International University for Nature, Society and Man, 19 Universitetskaya Street, Dubna, 141980 (Russian Federation)

    2011-03-14

    In this paper we carry out a comparative analysis of the word network as the collaboration network based on the novel by M. Bulgakov 'Master and Margarita', the synonym network of the Russian language as well as the Russian movie actor network. We have constructed one-mode projections of these networks, defined degree distributions for them and have calculated main characteristics. In the paper a generation algorithm of collaboration networks has been offered which allows one to generate networks statistically equivalent to the studied ones. It lets us reveal a structural correlation between word network, synonym network and movie actor network. We show that the degree distributions of all analyzable networks are described by the distribution of q-type.

  4. Comparative analysis of collaboration networks

    NASA Astrophysics Data System (ADS)

    Progulova, Tatiana; Gadjiev, Bahruz

    2011-03-01

    In this paper we carry out a comparative analysis of the word network as the collaboration network based on the novel by M. Bulgakov "Master and Margarita", the synonym network of the Russian language as well as the Russian movie actor network. We have constructed one-mode projections of these networks, defined degree distributions for them and have calculated main characteristics. In the paper a generation algorithm of collaboration networks has been offered which allows one to generate networks statistically equivalent to the studied ones. It lets us reveal a structural correlation between word network, synonym network and movie actor network. We show that the degree distributions of all analyzable networks are described by the distribution of q-type.

  5. Dissertation Network Architectures

    E-print Network

    Carle, Georg

    and anonymous Peer-to-Peer Systems Heiko Niedermayer Network Architectures and Services Department of Computer Lehrstuhl f¨ur Netzarchitekturen und Netzdienste Architecture and Components of secure and anonymous Peer-to-Peer and anonymous Peer-to-Peer Systems Dissertation, July 2010 Network Architectures and Services, Department

  6. Network Collaboration with UNIX.

    ERIC Educational Resources Information Center

    Horn, Wm. Dennis

    1993-01-01

    Discusses networking as a collaboration tool in the teaching of technical writing. Argues that some degree of collaboration is innate to all writing, that word processing already facilitates that collaboration, and that networking is the next enhancement to the collaborative process. (RS)

  7. GENE EXPRESSION NETWORKS

    EPA Science Inventory

    "Gene expression network" is the term used to describe the interplay, simple or complex, between two or more gene products in performing a specific cellular function. Although the delineation of such networks is complicated by the existence of multiple and subtle types of intera...

  8. Evolutionary Artificial Neural Networks

    Microsoft Academic Search

    Xin Yao

    1993-01-01

    Evolutionary Artificial Neural Networks (EANNs) can be considered as a combination of artificial neural networks (ANNs) and evolutionary search procedures, such as genetic algorithms (GAs). This paper distinguishes among three levels of evolution in EANNs, i.e., the evolution of connection weights, architectures, and learning rules. It first reviews each kind of evolution in detail and then analyses major issues related

  9. Quantum neural networks

    Microsoft Academic Search

    Alexandr A. Ezhov; Dan Ventura

    This chapter outlines the research, development and perspectives of quantum neural networks - a burgeoning new field which integrates classical neurocomputing with quantum computation (1). It is argued that the study of quantum neural networks may give us both new undestanding of brain function as well as unprecedented possibilities in creating new systems for information processing, including solving classically intractable

  10. Community Wireless Networks

    ERIC Educational Resources Information Center

    Feld, Harold

    2005-01-01

    With increasing frequency, communities are seeing the arrival of a new class of noncommercial broadband providers: community wireless networks (CWNs). Utilizing the same wireless technologies that many colleges and universities have used to create wireless networks on campus, CWNs are creating broadband access for free or at costs well below…

  11. Reflections on Active Networking

    Microsoft Academic Search

    Jonathan M. Smith

    Interactions among telecommunications networks, computers, and other peripheral devices have been of interest since the earliest distributed computing systems. A key architectural question is the location (and nature) of programmability. One perspective, that examined in this paper, is that network elements should be as programmable as possible, in order to build the most fle xible distributed computing systems. This paper

  12. Classroom Computer Network.

    ERIC Educational Resources Information Center

    Lent, John

    1984-01-01

    This article describes a computer network system that connects several microcomputers to a single disk drive and one copy of software. Many schools are switching to networks as a cheaper and more efficient means of computer instruction. Teachers may be faced with copywriting problems when reproducing programs. (DF)

  13. Reti Fotoniche (Optical Networks)

    E-print Network

    Mellia, Marco

    Ethernet n Storagearea networks: Fibre Channel Reti ottiche di seconda generazione: n reti broadcast Presentation 6 Session 5 Transport 4 Network 3 Logical Link 2 Physical 1 Ridurre la complessità Ethernet Token controllare e multiplare end-to-end i flussi di informazione, e IP come protocollo di rete. Tra router IP

  14. Network Forms of Organization

    Microsoft Academic Search

    Joel M. Podolny; Karen L. Page

    1998-01-01

    Initial sociological interest in network forms of organization was motivated in part by a critique of economic views of organization. Sociologists sought to highlight the prevalence and functionality of organizational forms that could not be classified as markets or hierarchies. As a result of this work, we now know that network forms of organization foster learning, represent a mechanism for

  15. K-12 Computer Networking.

    ERIC Educational Resources Information Center

    ERIC Review, 1993

    1993-01-01

    The "ERIC Review" is published three times a year and announces research results, publications, and new programs relevant to each issue's theme topic. This issue explores computer networking in elementary and secondary schools via two principal articles: "Plugging into the 'Net'" (Michael B. Eisenberg and Donald P. Ely); and "Computer Networks for…

  16. TKN Telecommunication Networks Group

    E-print Network

    Wichmann, Felix

    S is to integrate circuit switching - analogical as in the Public Switched Telephone Network - into the Internet Group Dynamic shortcut circuits - concept and case study for static scenarios Filip Idzikowski, Berthold. All Rights reserved. #12;Abstract Introduction of circuits into the packet-switched network influences

  17. Programmability of nanowire networks.

    PubMed

    Bellew, A T; Bell, A P; McCarthy, E K; Fairfield, J A; Boland, J J

    2014-08-21

    Electrical connectivity in networks of nanoscale junctions must be better understood if nanowire devices are to be scaled up from single wires to functional material systems. We show that the natural connectivity behaviour found in random nanowire networks presents a new paradigm for creating multi-functional, programmable materials. In devices made from networks of Ni/NiO core-shell nanowires at different length scales, we discover the emergence of distinct behavioural regimes when networks are electrically stressed. We show that a small network, with few nanowire-nanowire junctions, acts as a unipolar resistive switch, demonstrating very high ON/OFF current ratios (>10(5)). However, large networks of nanowires distribute an applied bias across a large number of junctions, and thus respond not by switching but instead by evolving connectivity. We demonstrate that these emergent properties lead to fault-tolerant materials whose resistance may be tuned, and which are capable of adaptively reconfiguring under stress. By combining these two behavioural regimes, we demonstrate that the same nanowire network may be programmed to act both as a metallic interconnect, and a resistive switch device with high ON/OFF ratio. These results enable the fabrication of programmable, multi-functional materials from random nanowire networks. PMID:24990707

  18. The protein folding network

    NASA Astrophysics Data System (ADS)

    Rao, Francesco; Caflisch, Amedeo

    2004-03-01

    Networks are everywhere. The conformation space of a 20-residue antiparallel beta-sheet peptide [1], sampled by molecular dynamics simulations, is mapped to a network. Conformations are nodes of the network, and the transitions between them are links. As previously found for the World-Wide Web as well as for social and biological networks , the conformation space contains highly connected hubs like the native state which is the most populated free energy basin. Furthermore, the network shows a hierarchical modularity [2] which is consistent with the funnel mechanism of folding [3] and is not observed for a random heteropolymer lacking a native state. Here we show that the conformation space network describes the free energy landscape without requiring projections into arbitrarily chosen reaction coordinates. The network analysis provides a basis for understanding the heterogeneity of the folding transition state and the existence of multiple pathways. [1] P. Ferrara and A. Caflisch, Folding simulations of a three-stranded antiparallel beta-sheet peptide, PNAS 97, 10780-10785 (2000). [2] Ravasz, E. and Barabási, A. L. Hierarchical organization in complex networks. Phys. Rev. E 67, 026112 (2003). [3] Dill, K. and Chan, H From Levinthal to pathways to funnels. Nature Struct. Biol. 4, 10-19 (1997)

  19. Optimising Networks Against Malware

    Microsoft Academic Search

    Pierre-marc Bureau; José M. Fernandez

    2007-01-01

    Rapidly-spreading malicious software is an important threat on today's computer networks. Most solutions that have been proposed to counter this threat are based on our ability to quickly detect the malware-generated traffic or the malware instances themselves, something that in many cases can be beyond our ability. Nonetheless, it seems intu- itive that certain defensive postures adopted in configuring networks

  20. INTRODUCTION TO NETWORK CALCULUS

    Microsoft Academic Search

    Ulrich Klehmet

    2005-01-01

    Network Calculus (NC) is a novel system theory for deterministic queueing systems. It is an approach of developments which main focus is to provide insights into flow problems encountered in networking. The mathematical theory of dioids, and here in particular, the Min- Plus algebra, is the foundation of NC. To this day it is a big challenge to give assured

  1. TOXNET (TOXICOLOGY DATA NETWORK)

    EPA Science Inventory

    TOXNET (Toxicology Data Network) is a computerized system of files oriented to toxicology and related areas. It is managed by the National Library of Medicines Toxicology and Environmental Health Information Program (TEHIP) and runs on a series of microcomputers in a networked cl...

  2. Dynamics of fractal networks

    Microsoft Academic Search

    R. Orbach

    1986-01-01

    Random structures often exhibit fractal geometry, defined in terms of the mass scaling exponent, D, the fractal dimension. The vibrational dynamics of fractal networks are expressed in terms of the exponent d double bar, the fracton dimensionality. The eigenstates on a fractal network are spatially localized for d double bar less than or equal to 2. The implications of fractal

  3. Network Characterization Service (NCS)

    Microsoft Academic Search

    Guojun Jin; George Yang; Brian R. Crowley; Deborah A. Agarwal

    2001-01-01

    Distributed applications require information to effectively utilize the network. Some of the information they require is the current and maximum bandwidth, current and minimum latency, bottlenecks, burst frequency, and congestion extent. This type of information allows applications to determine parameters like optimal TCP buffer size. In this paper, we present a cooperative information-gathering tool called the network characterization service (NCS).

  4. FRIENDSHIP NETWORKS &ast

    Microsoft Academic Search

    Jan K. Brueckner

    2006-01-01

    ABSTRACT.?This paper develops a model of social networks different from those presented in the recent literature. In contrast to existing models, the level of investment in link formation is a continuous decision variable, and links form stochastically rather than deterministically, with the probability depending on the noncooperative investment choices of both parties. Since the network structure is then stochastic rather

  5. Wireless sensor network survey

    Microsoft Academic Search

    Jennifer Yick; Biswanath Mukherjee; Dipak Ghosal

    2008-01-01

    A wireless sensor network (WSN) has important applications such as remote environmental monitoring and target tracking. This has been enabled by the availability, particularly in recent years, of sensors that are smaller, cheaper, and intelligent. These sensors are equipped with wireless interfaces with which they can communicate with one another to form a network. The design of a WSN depends

  6. Multifunctional Mesoscale Observing Networks

    Microsoft Academic Search

    Walter F. Dabberdt; Thomas W. Schlatter; Frederick H. Carr; Elbert W. Joe Friday; David Jorgensen; Steven Koch; Maria Pirone; F. Martin Ralph; Juanzhen Sun; Patrick Welsh; James W. Wilson; Xiaolei Zou

    2005-01-01

    More than 120 scientists, engineers, administrators, and users met on 8 10 December 2003 in a workshop format to discuss the needs for enhanced three-dimensional mesoscale observing networks. Improved networks are seen as being critical to advancing numerical and empirical modeling for a variety of mesoscale applications, including severe weather warnings and forecasts, hydrology, air-quality forecasting, chemical emergency response, transportation

  7. Telecommunications network optimization

    NASA Technical Reports Server (NTRS)

    Lee, J.

    1979-01-01

    Analysis discusses STACOM (state criminal justic communication) network topology program used to design and evaluate digital telecommunications networks STACOM employs ESAU-WILLIAMS technique to search for direct links between system terminations and regional switching center. Inputs include traffic data, terminal locations, and functional requirements.

  8. Social Insect Networks

    NSDL National Science Digital Library

    Jennifer Fewell (Arizona State University; School of Life Sciences)

    2003-09-26

    Social insect colonies have many of the properties of adaptive networks. The simple rules governing how local interactions among individuals translate into group behaviors are found across social groups, giving social insects the potential to have a profound impact on our understanding of the interplay between network dynamics and social evolution.

  9. Networked Learning Environments.

    ERIC Educational Resources Information Center

    Chute, Alan G.; Sayers, Pamela K.; Gardner, Richard P.

    1997-01-01

    Distance learning networks make training and advanced education possible when time and budgetary constraints make face-to-face training difficult. To make distance learning work, instructors and providers must harness the potential of synchronous and asynchronous communication technologies to create powerful, learner-centered networks. Support…

  10. Trees, networks, and hydrology

    Microsoft Academic Search

    Andrea Rinaldo; Jayanth R. Banavar; Amos Maritan

    2006-01-01

    This paper reviews theoretical and observational material on form and function of natural networks appeared in somewhat disparate contexts from physics to biology, whose study is related to hydrologic research. Moving from the exact result that drainage network configurations minimizing total energy dissipation are stationary solutions of the general equation describing landscape evolution, we discuss the properties and the dynamic

  11. Knapsack packing networks.

    PubMed

    Hellstrom, B J; Kanal, L N

    1992-01-01

    A knapsack packing neural network of 4n units with both low-order and conjunctive asymmetric synapses is derived from a non-Hamiltonian energy function. Parallel simulations of randomly generated problems of size n in {5, 10, 20} are used to compare network solutions with those of simple greedy fast parallel enumerative algorithms. PMID:18276431

  12. Quantum neural network

    E-print Network

    M. V. Altaisky

    2001-07-05

    It is suggested that a quantum neural network (QNN), a type of artificial neural network, can be built using the principles of quantum information processing. The input and output qubits in the QNN can be implemented by optical modes with different polarization, the weights of the QNN can be implemented by optical beam splitters and phase shifters

  13. UNESCO as a Network

    ERIC Educational Resources Information Center

    Omolewa, Michael

    2007-01-01

    This study attempts to draw attention to the hitherto neglected, but important, subject of how the United Nations Educational, Scientific, and Cultural Organization (UNESCO), as a network and promoter of other networks, has sought to foster the spirit of cooperation, understanding and partnership among its various Member States through…

  14. The Deep Space Network

    NASA Technical Reports Server (NTRS)

    1979-01-01

    Deep Space Network progress in flight project support, tracking and data acquisition, research and technology, network engineering, hardware and software implementation, and operations is cited. Topics covered include: tracking and ground based navigation; spacecraft/ground communication; station control and operations technology; ground communications; and deep space stations.

  15. Lagrange programming neural networks

    Microsoft Academic Search

    Shengwei Zhang; A. G. Constantinides

    1992-01-01

    A class of neural networks appropriate for general nonlinear programming, i.e., problems including both equality and inequality constraints, is analyzed in detail. The methodology is based on the Lagrange multiplier theory in optimization and seeks to provide solutions satisfying the necessary conditions of optimality. The equilibrium point of the network satisfies the Kuhn-Tucker condition for the problem. No explicit restriction

  16. Networking in Academia.

    ERIC Educational Resources Information Center

    Fattig, W. Donald

    1984-01-01

    Discusses the use of microcomputers as communication devices and presents features of several national bibliographic networks, together with examples of searches for information of interest to academics. The status of electronic publishing is discussed and differences between national and local area networks are described. (Author)

  17. Broadband network selection issues

    Microsoft Academic Search

    Michael E. Leimer

    1996-01-01

    Selecting the best network for a given cable or telephone company provider is not as obvious as it appears. The cost and performance trades between Hybrid Fiber Coax (HFC), Fiber to the Curb (FTTC) and Asymmetric Digital Subscriber Line networks lead to very different choices based on the existing plant and the expected interactive subscriber usage model. This paper presents

  18. PESTICIDE INFORMATION NETWORK

    EPA Science Inventory

    The Pesticide Information Network (PIN) is an interactive database containing information about pesticides. PIN is a free service offered by the USEPAs Office of Pesticide Programs which provides contacts on pesticide issues, has a bulletin board network for public and private us...

  19. Social language network analysis

    Microsoft Academic Search

    Andrew J. Scholand; Yla R. Tausczik; James W. Pennebaker

    2010-01-01

    In this note we introduce a new methodology that combines tools from social language processing and network analysis to identify socially situated relationships between individuals, even when these relationships are latent or unrecognized. We call this approach social language network analysis (SLNA). We describe the philosophical antecedents of SLNA, the mechanics of preprocessing, processing, and post-processing stages, and the results

  20. Smart networked cities?

    Microsoft Academic Search

    Emmanouil Tranos; Drew Gertner

    2012-01-01

    This paper aims to critically assess the lack of a global inter-urban perspective in the smart city policy framework from a conceptual standpoint. We argue here that the smart city policy agenda should be informed by and address the structure of transnational urban networks as this can affect the efficiency of such local policies. The significance of this global network

  1. Random network coding for wireless ad-hoc networks

    Microsoft Academic Search

    Rodica Stoian; L. A. Perisoara; Radu Stoica

    2009-01-01

    In this paper we analyze the performances of multicast transmission in networks using random network coding. With network coding, the intermediate nodes combine the input packets into one or several output packets, instead of simply forwarding the packets as in the case of classical routing. The problem of network code design is to select what linear combination of input packets

  2. Introduction to Network Science 1 Introduction to Network Science

    E-print Network

    Safro, Ilya

    Introduction to Network Science 1 Introduction to Network Science Instructor: Ilya Safro, 228 McAdams Hall Course: Introduction to Network Science, CP SC 481/681/881 Time: 9:30-10:45 TTh Place: 211 Daniel A 80 B 60 C 0 F #12;Introduction to Network Science 2 Recommended Books (optional) #12;Introduction

  3. Network on a Chip: Modeling Wireless Networks with Asynchronous VLSI

    E-print Network

    Manohar, Rajit

    Network on a Chip: Modeling Wireless Networks with Asynchronous VLSI Rajit Manohar and Clinton VLSI archi- tecture for fast and efficient simulation of wireless networks. The approach is inspired component-based simulation architectures (for instance, see [3, 14]). Wireless ad hoc networks present

  4. Networks for teenagers February 2014 More network science for teenagers

    E-print Network

    Sánchez, Angel "Anxo"

    Networks for teenagers · February 2014 More network science for teenagers Angel Sánchez & Cristina teenagers to Network Science. In their paper, they state: We are continuing to conduct outreach activities://www.anxosanchez.eu 1 #12;Networks for teenagers · February 2014 I. Activity at the University: Talk + workshop

  5. Network Intrusion Detection Using an Improved Competitive Learning Neural Network

    E-print Network

    Ghorbani, Ali

    Network Intrusion Detection Using an Improved Competitive Learning Neural Network John Zhong Lei- work intrusions based on a competitive learning neural net- work. In the paper, the performance exceptionally in terms of both ac- curacy and computation time. Keywords Network Security, Network Intrusion

  6. Survey of Network Management Protocols in Wireless Sensor Network

    Microsoft Academic Search

    Bin Zhang; Guohui Li

    2009-01-01

    Wireless sensor networks (WSNs) have promised us a new monitoring and controlling model over the distributed computing environment. Network management in WSNs becomes extremely important and vital in order to keep the whole network and application work properly. This paper summarizes the uniqueness of network management protocol for WSN, provide an overview analysis of several current existed protocols, so as

  7. Supervised Learning in Neural Networks without Feedback Networks

    E-print Network

    Lin, Feng

    Supervised Learning in Neural Networks without Feedback Networks Robert D. Brandt and Feng Lin Abstract In this paper, we study the supervised learning in neural networks. Unlike the com- mon practice (hardware) implementation of arti cial neural networks. This research is supported in part by the National

  8. Scale-Free Networks and Robustness of Critical Infrastructure Networks

    Microsoft Academic Search

    A. H. Dekker; B. Colbert

    2004-01-01

    We examine the robustness of critical infrastructure networks, specifically aspects which relate to the network topology. We describe some simulation studies which identify a number of characteristics that make a network robust in the face of terrorist attacks, taking link capacity into account. Our simulations utilise a network analysis package called CAVALIER, which we have developed. Our results confirm the

  9. Collective network routing

    DOEpatents

    Hoenicke, Dirk

    2014-12-02

    Disclosed are a unified method and apparatus to classify, route, and process injected data packets into a network so as to belong to a plurality of logical networks, each implementing a specific flow of data on top of a common physical network. The method allows to locally identify collectives of packets for local processing, such as the computation of the sum, difference, maximum, minimum, or other logical operations among the identified packet collective. Packets are injected together with a class-attribute and an opcode attribute. Network routers, employing the described method, use the packet attributes to look-up the class-specific route information from a local route table, which contains the local incoming and outgoing directions as part of the specifically implemented global data flow of the particular virtual network.

  10. Reworking the language network

    PubMed Central

    Fedorenko, Evelina; Thompson-Schill, Sharon L.

    2014-01-01

    Prior investigations of functional specialization have focused on the response profiles of particular brain regions. Given the growing emphasis on regional covariation, we propose to reframe these questions in terms of brain “networks” (collections of regions jointly engaged by some mental process). In spite of the challenges that investigations of the language network face, a network approach may prove useful in understanding the cognitive architecture of language. We propose that a language network plausibly includes a functionally specialized “core” (brain regions that coactivate with each other during language processing), and a domain-general “periphery” (a set of brain regions that may coactivate with the language core regions sometimes, but with other specialized systems at other times, depending on task demands). Framing the debate around network properties such as this may prove to be a more fruitful way to advance our understanding of the neurobiology of language. PMID:24440115

  11. Concordant Chemical Reaction Networks

    E-print Network

    Shinar, Guy

    2011-01-01

    We describe a large class of chemical reaction networks, those endowed with a subtle structural property called concordance. We show that the class of concordant networks coincides precisely with the class of networks which, when taken with any weakly monotonic kinetics, invariably give rise to kinetic systems that are injective --- a quality that, among other things, precludes the possibility of switch-like transitions between distinct positive steady states. We also provide persistence characteristics of concordant networks, instability implications of discordance, and consequences of stronger variants of concordance. Some of our results are in the spirit of recent ones by Banaji and Craciun, but here we do not require that every species suffer a degradation reaction. This is especially important in studying biochemical networks, for which it is rare to have all species degrade.

  12. Motifs in Brain Networks

    PubMed Central

    2004-01-01

    Complex brains have evolved a highly efficient network architecture whose structural connectivity is capable of generating a large repertoire of functional states. We detect characteristic network building blocks (structural and functional motifs) in neuroanatomical data sets and identify a small set of structural motifs that occur in significantly increased numbers. Our analysis suggests the hypothesis that brain networks maximize both the number and the diversity of functional motifs, while the repertoire of structural motifs remains small. Using functional motif number as a cost function in an optimization algorithm, we obtain network topologies that resemble real brain networks across a broad spectrum of structural measures, including small-world attributes. These results are consistent with the hypothesis that highly evolved neural architectures are organized to maximize functional repertoires and to support highly efficient integration of information. PMID:15510229

  13. Decentralized Online Social Networks

    NASA Astrophysics Data System (ADS)

    Datta, Anwitaman; Buchegger, Sonja; Vu, Le-Hung; Strufe, Thorsten; Rzadca, Krzysztof

    Current Online social networks (OSN) are web services run on logically centralized infrastructure. Large OSN sites use content distribution networks and thus distribute some of the load by caching for performance reasons, nevertheless there is a central repository for user and application data. This centralized nature of OSNs has several drawbacks including scalability, privacy, dependence on a provider, need for being online for every transaction, and a lack of locality. There have thus been several efforts toward decentralizing OSNs while retaining the functionalities offered by centralized OSNs. A decentralized online social network (DOSN) is a distributed system for social networking with no or limited dependency on any dedicated central infrastructure. In this chapter we explore the various motivations of a decentralized approach to online social networking, discuss several concrete proposals and types of DOSN as well as challenges and opportunities associated with decentralization.

  14. Easily repairable networks

    NASA Astrophysics Data System (ADS)

    Fink, Thomas

    2015-03-01

    We introduce a simple class of distribution networks which withstand damage by being repairable instead of redundant. Instead of asking how hard it is to disconnect nodes through damage, we ask how easy it is to reconnect nodes after damage. We prove that optimal networks on regular lattices have an expected cost of reconnection proportional to the lattice length, and that such networks have exactly three levels of structural hierarchy. We extend our results to networks subject to repeated attacks, in which the repairs themselves must be repairable. We find that, in exchange for a modest increase in repair cost, such networks are able to withstand any number of attacks. We acknowledge support from the Defense Threat Reduction Agency, BCG and EU FP7 (Growthcom).

  15. Resilient networking in wireless sensor networks

    E-print Network

    Erdene-Ochir, Ochirkhand; Valois, Fabrice; Kountouris, Apostolos

    2010-01-01

    This report deals with security in wireless sensor networks (WSNs), especially in network layer. Multiple secure routing protocols have been proposed in the literature. However, they often use the cryptography to secure routing functionalities. The cryptography alone is not enough to defend against multiple attacks due to the node compromise. Therefore, we need more algorithmic solutions. In this report, we focus on the behavior of routing protocols to determine which properties make them more resilient to attacks. Our aim is to find some answers to the following questions. Are there any existing protocols, not designed initially for security, but which already contain some inherently resilient properties against attacks under which some portion of the network nodes is compromised? If yes, which specific behaviors are making these protocols more resilient? We propose in this report an overview of security strategies for WSNs in general, including existing attacks and defensive measures. In this report we focu...

  16. Phase relations in the composition(Pb 1- yCu y)Sr 2(Ln 1- xCa x)Cu 2O 7 and the crystal structure of La 8- xSr xCu 8- yO 20

    NASA Astrophysics Data System (ADS)

    Lee, J. Y.; Kim, J. S.; Swinnea, J. S.; Steinfink, H.

    1990-02-01

    The compound (Pb 0.71Cu 0.29)Sr 2(Ln 1-xCa x)Cu 2O 7 (1212) has been synthesized as single phase material for La, Pr, Nd, Gd, Er, and Y from the proper starting compositions fired above 950°C. Calcium can be substituted up to x = 0.5. When this limit is exceeded the 1212 phase, SrCuO 2, and a hexagonal phase are formed. When x = 1 only SrCuO 2 and the hexagonal phase are formed. The hexagonal phase has the general composition Sr 5- xPb 3+ xCu yO 11+ z. When a mixture corresponding to PbSr 2Co 0.5Cu 0.5O z is fired above 960°C a tetragonal phase isostructural with TlSr 2CuO 5 (121) forms, but below 960°C the hexagonal phase is formed. A nominal mixture of PbSr 2CaCu 2 (1212) fired at 930°C and quenched forms primarily the SrCuO 2 phase and some of the hexagonal compound, but slow cooling in the furnace produces a nearly single phase hexagonal product. The crystal structure of a crystal found in a reaction product from a nominal mixture PbSr 2LaCu 2 (1212) fired at 1050°C was determined from three-dimensional X-ray diffraction data. Its composition is (La 6.16Sr 1.84)Cu 7.66O 20, M r = 1823.6 , tetragonal, P4/mbm, a = 10.7468(8)Å, c = 3.8633(3)Å, V = 446.2(1)Å 3, Z = 1, D x = 6.79g cm -3, ? = 0.71069Å, ? = 288.0 cm -1, R = 0.032, wR = 0.034 for 385 observed reflections. The structure is formed by the articulation of Cu octahedra, square pyramids, and square coplanar nets into a three-dimensional framework. LaSr are in 10-fold coordination to oxygen atoms that are in a perovskite-like arrangement. The octahedral Cul site contains 17% vacancies on the basis of the least-squares refinement of the site occupancy. The two apical Cul sbnd O bond lengths are 1.9317(1)Å, and the four equatorial lengths are 1.978(7)Å. The square Cu2 sbnd O bond lengths are 1.9317(1) and 1.869(6)Å, respectively. The square pyramidal Cu3 sbnd O bond lengths are 2.364(6)Åto the apex and 1.9322(2) and 1.878(7)Å, respectively, to pairs of the four equatorial oxygen ions. Valence bond calculation and the abence of Jahn-Teller distortion around the octahedrally coordinated Cu1 indicate that it is trivalent.

  17. November 2003 NETWORK SECURITY TESTING

    E-print Network

    November 2003 NETWORK SECURITY TESTING Shirley M. Radack, Editor, Computer Security Division prudent investments to enhance the security posture of their systems. NIST Guideline on Network Security, and Murugiah Souppaya, NIST SP 800-42 introduces three aspects of network security testing: How network

  18. Spiking neural networks, an introduction

    E-print Network

    Utrecht, Universiteit

    as these computerised neurons are, we refer to them as networks of artificial neurons, or artificial neural networks. We in the next chapter. Generations of artificial neurons Artificial neural networks are already becoming. The first generation of artificial neural networks consisted of McCulloch-Pitts threshold neu- rons [15

  19. The Georgia Tech Network Simulator

    Microsoft Academic Search

    George F. Riley

    2003-01-01

    We introduce a new network simulation environment, developed by our research group, called the Georgia Tech Network Simulator (GTNetS). Our simulator is designed specifically to allow much larger-scale simulations than can easily be created by existing network simulation tools. The design of the simulator very closely matches the design of real network protocol stacks and hardware. Thus, anyone with a

  20. Management of coalition sensor networks

    Microsoft Academic Search

    Dinesh Chandra Verma; Theodore Brown; Carolyn Ortega

    2010-01-01

    The management of sensor networks in coalition settings has been treated in a piecemeal fashion in the current literature without taking a comprehensive look at the complete life cycle of coalition networks, and determining the different aspects of network management that need to be taken into account for the management of sensor networks in those contexts. In this paper, we

  1. NETWORK SCIENCE Theory and Practice

    E-print Network

    Chen, Guanrong "Ron"

    NETWORK SCIENCE Theory and Practice TED G. LEWIS Professor of Computer Science Naval Postgraduate of Congress Cataloging-in-Publication Data: Lewis, T. G. (Theodore Gyle), 1941- Network science : theory Bristor, Ryan "Buying networks" ¼ application of network science to model economic system 1990 Guare

  2. Migration Networks and Immigrant Entrepreneurship

    Microsoft Academic Search

    Ivan Light; Parminder Bhachu; Stavros Karageorgis

    1989-01-01

    Migration network theory addresses the cumulative causation of migration as a result of reduced social, economic, and emotional costs of migration pursuant to the formation of migration networks. Because it introduces a sociological dimension, network theory improves the mechanical and economistic “push and pull†conceptions that prevailed earlier, including world systems versions thereof. Nonetheless, existing treatments of migration networks overlook

  3. Neural networks in seismic discrimination

    Microsoft Academic Search

    F. U. Dowla

    1995-01-01

    Neural networks are powerful and elegant computational tools that can be used in the analysis of geophysical signals. At Lawrence Livermore National Laboratory, we have developed neural networks to solve problems in seismic discrimination, event classification, and seismic and hydrodynamic yield estimation. Other researchers have used neural networks for seismic phase identification. We are currently developing neural networks to estimate

  4. Detecting Hotspots in Geographic Networks

    Microsoft Academic Search

    Kevin Buchin; Sergio Cabello; Joachim Gudmundsson; Maarten Löffler; Jun Luo; Günther Rote; Rodrigo I. Silveira; Bettina Speckmann; Thomas Wolle

    2009-01-01

    We study a point pattern detection problem on networks, motivated by geo- graphical analysis tasks, such as crime hotspot detection. Given a network N (for example, a street, train, or highway network) together with a set of sites which are located on the network (for example, accident locations or crime scenes), we want to find a connected subnetwork F of

  5. Institutionalizing College Networks for Student Success.

    ERIC Educational Resources Information Center

    Calder, William B.; Gordon, William

    1999-01-01

    Explores concepts of college "networking" in the context of improving student retention and success, including student-to-student networks, faculty-to-faculty networks, faculty-to-student networks, institution-to-student networks, institution-to-faculty/staff networks, and institution-to-local community networks. Considers the need to address…

  6. Pajek - Program for Large Network Analysis

    Microsoft Academic Search

    Vladimir Batagelj; Andrej Mrvar

    1998-01-01

    Large networks, having thousands of vertices and lines, can be found in many different areas, e. g: genealogies, flo w graphs of programs, molecule, computer networks, trans- portation networks, social networks, intra\\/inter organisational networks ... Many standard network algorithms are very time and space consuming and therefore unsuitable for analy- sis of such networks. In the article we present some

  7. Neural networks in seismic discrimination

    SciTech Connect

    Dowla, F.U.

    1995-01-01

    Neural networks are powerful and elegant computational tools that can be used in the analysis of geophysical signals. At Lawrence Livermore National Laboratory, we have developed neural networks to solve problems in seismic discrimination, event classification, and seismic and hydrodynamic yield estimation. Other researchers have used neural networks for seismic phase identification. We are currently developing neural networks to estimate depths of seismic events using regional seismograms. In this paper different types of network architecture and representation techniques are discussed. We address the important problem of designing neural networks with good generalization capabilities. Examples of neural networks for treaty verification applications are also described.

  8. Program Helps Simulate Neural Networks

    NASA Technical Reports Server (NTRS)

    Villarreal, James; Mcintire, Gary

    1993-01-01

    Neural Network Environment on Transputer System (NNETS) computer program provides users high degree of flexibility in creating and manipulating wide variety of neural-network topologies at processing speeds not found in conventional computing environments. Supports back-propagation and back-propagation-related algorithms. Back-propagation algorithm used is implementation of Rumelhart's generalized delta rule. NNETS developed on INMOS Transputer(R). Predefines back-propagation network, Jordan network, and reinforcement network to assist users in learning and defining own networks. Also enables users to configure other neural-network paradigms from NNETS basic architecture. Small portion of software written in OCCAM(R) language.

  9. Network Probe 0.5

    NSDL National Science Digital Library

    Network Probe 0.5 is a free network monitor and protocol analyzer that offers users an immediate picture of the current traffic situation on their network. Network Probe 0.5 also gives users the option to identify and isolate traffic problems and congestion throughout their entire network. Adding breadth and depth to the available features is the fact that users may also filter out selected protocols and hosts, along with sorting out network traffic by the amount of bytes sent or received. Network Probe 0.5 is compatible with all systems running Windows NT and higher.

  10. Network connectivity entropy and its application on network connectivity reliability

    NASA Astrophysics Data System (ADS)

    Wu, Liusan; Tan, Qingmei; Zhang, Yuehui

    2013-11-01

    The network structure entropy has served as one of the index measuring network heterogeneity, but it gives no considerations to the impact of isolated nodes on the network structure. In addition, the all-terminal reliability is zero and is unable to compare it between disconnected networks. Therefore, the concept of network connectivity entropy is suggested to remove the current bottleneck and helps facilitate new index in terms of network connectivity reliability. This study fully proves the rules as follows: when the edges of network are diminishing, the newly-established network connectivity reliability will remain unchanged or become weaker; conversely, when the edges of network are increasing, the network connectivity reliability will remain unchanged or become stronger. Thus, the proposed index of network connectivity reliability is proved reasonable. Furthermore, the impaired metro network of Nanjing city is exemplified to demonstrate the validity and practicability of network connectivity reliability. The result shows that this new approach is in good position to compute network connectivity reliability quickly and effectively, and also to compare it between different networks.

  11. Mesoscale Analyses of Fungal Networks

    E-print Network

    Lee, Sang Hoon; Porter, Mason A

    2014-01-01

    We give a brief application of mesoscopic response functions (MRFs) to a large set of networks of fungi and slime moulds. We construct "structural networks" by estimating cord conductances (which yield edge weights) from experimental data and "functional networks" by calculating edge weights based on how much nutrient traffic is predicted to occur on each edge. Both types of networks have the same topology, and we compute MRFs for both families of networks to illustrate two different ways of constructing taxonomies to compare large sets of fungal and slime-mould networks to each other. We demonstrate that network taxonomies allow objective groupings of networks across species, treatments, and laboratories. We believe that the groupings that we have derived through our structural and functional taxonomic analyses of fungal networks could be of considerable assistance to biologists in their attempts to capture the impact of treatment combinations on network behaviour.

  12. Controllability of deterministic complex networks

    NASA Astrophysics Data System (ADS)

    Li, Xin-Feng; Lu, Zhe-Ming; Li, Hui

    2015-07-01

    Recently, the controllability of complex networks has attracted wide attention of researchers. The main contribution comes from Liu et al. who proposed the structural controllability as an analytical framework for making predictions regarding the control of directed networks in Nature. Since then, the controllability of many model and real networks has been deeply investigated except deterministic complex networks. In this paper, we focus on studying the controllability of deterministic complex networks. We examine six typical deterministic networks, the simulation results show that the minimum number of driver nodes grows linearly with network size. When the network size is large enough, the controllability approximates to a constant not more than 0.4, indicating that the deterministic networks are relatively easy to control. Furthermore, we investigate the characteristics of driver nodes in deterministic complex networks, finding that the driver nodes tend to avoid high degree nodes but to have high clustering coefficients.

  13. A quantum access network

    E-print Network

    Bernd Fröhlich; James F. Dynes; Marco Lucamarini; Andrew W. Sharpe; Zhiliang Yuan; Andrew J. Shields

    2014-09-02

    The theoretically proven security of quantum key distribution (QKD) could revolutionise how information exchange is protected in the future. Several field tests of QKD have proven it to be a reliable technology for cryptographic key exchange and have demonstrated nodal networks of point-to-point links. However, so far no convincing answer has been given to the question of how to extend the scope of QKD beyond niche applications in dedicated high security networks. Here we show that adopting simple and cost-effective telecommunication technologies to form a quantum access network can greatly expand the number of users in quantum networks and therefore vastly broaden their appeal. We are able to demonstrate that a high-speed single-photon detector positioned at a network node can be shared between up to 64 users for exchanging secret keys with the node, thereby significantly reducing the hardware requirements for each user added to the network. This point-to-multipoint architecture removes one of the main obstacles restricting the widespread application of QKD. It presents a viable method for realising multi-user QKD networks with resource efficiency and brings QKD closer to becoming the first widespread technology based on quantum physics.

  14. Simulated Associating Polymer Networks

    NASA Astrophysics Data System (ADS)

    Billen, Joris

    Telechelic associating polymer networks consist of polymer chains terminated by endgroups that have a different chemical composition than the polymer backbone. When dissolved in a solution, the endgroups cluster together to form aggregates. At low temperature, a strongly connected reversible network is formed and the system behaves like a gel. Telechelic networks are of interest since they are representative for biopolymer networks (e.g. F-actin) and are widely used in medical applications (e.g. hydrogels for tissue engineering, wound dressings) and consumer products (e.g. contact lenses, paint thickeners). In this thesis such systems are studied by means of a molecular dynamics/Monte Carlo simulation. At first, the system in rest is studied by means of graph theory. The changes in network topology upon cooling to the gel state, are characterized. Hereto an extensive study of the eigenvalue spectrum of the gel network is performed. As a result, an in-depth investigation of the eigenvalue spectra for spatial ER, scale-free, and small-world networks is carried out. Next, the gel under the application of a constant shear is studied, with a focus on shear banding and the changes in topology under shear. Finally, the relation between the gel transition and percolation is discussed.

  15. Optical storage networking

    NASA Astrophysics Data System (ADS)

    Mohr, Ulrich

    2001-11-01

    For efficient business continuance and backup of mission- critical data an inter-site storage network is required. Where traditional telecommunications costs are prohibitive for all but the largest organizations, there is an opportunity for regional carries to deliver an innovative storage service. This session reveals how a combination of optical networking and protocol-aware SAN gateways can provide an extended storage networking platform with the lowest cost of ownership and the highest possible degree of reliability, security and availability. Companies of every size, with mainframe and open-systems environments, can afford to use this integrated service. Three mayor applications are explained; channel extension, Network Attached Storage (NAS), Storage Area Networks (SAN) and how optical networks address the specific requirements. One advantage of DWDM is the ability for protocols such as ESCON, Fibre Channel, ATM and Gigabit Ethernet, to be transported natively and simultaneously across a single fiber pair, and the ability to multiplex many individual fiber pairs over a single pair, thereby reducing fiber cost and recovering fiber pairs already in use. An optical storage network enables a new class of service providers, Storage Service Providers (SSP) aiming to deliver value to the enterprise by managing storage, backup, replication and restoration as an outsourced service.

  16. Tinnitus: network pathophysiology-network pharmacology

    PubMed Central

    Elgoyhen, Ana B.; Langguth, Berthold; Vanneste, Sven; De Ridder, Dirk

    2012-01-01

    Tinnitus, the phantom perception of sound, is a prevalent disorder. One in 10 adults has clinically significant subjective tinnitus, and for one in 100, tinnitus severely affects their quality of life. Despite the significant unmet clinical need for a safe and effective drug targeting tinnitus relief, there is currently not a single Food and Drug Administration (FDA)-approved drug on the market. The search for drugs that target tinnitus is hampered by the lack of a deep knowledge of the underlying neural substrates of this pathology. Recent studies are increasingly demonstrating that, as described for other central nervous system (CNS) disorders, tinnitus is a pathology of brain networks. The application of graph theoretical analysis to brain networks has recently provided new information concerning their topology, their robustness and their vulnerability to attacks. Moreover, the philosophy behind drug design and pharmacotherapy in CNS pathologies is changing from that of “magic bullets” that target individual chemoreceptors or “disease-causing genes” into that of “magic shotguns,” “promiscuous” or “dirty drugs” that target “disease-causing networks,” also known as network pharmacology. In the present work we provide some insight into how this knowledge could be applied to tinnitus pathophysiology and pharmacotherapy. PMID:22291622

  17. Network Design for Information Networks (Extended Abstract)

    E-print Network

    Swamy, Chaitanya

    information from) central nodes and/or each # Dept. of Computer Science, Upson Hall, Cornell University. For example, in a sensor network application, dis­ tributed sensors need to send information to central nodes, and information sent from sensors can often be aggregated well along the paths. Another setting is content

  18. Network Design for Information Networks (Extended Abstract)

    E-print Network

    Swamy, Chaitanya

    information from) central nodes and/or each Dept. of Computer Science, Upson Hall, Cornell University, Ithaca, in a sensor network application, dis- tributed sensors need to send information to central nodes, and information sent from sensors can often be aggregated well along the paths. Another setting is content

  19. Knowledge management and innovation: networks and networking

    Microsoft Academic Search

    Jacky Swan; Sue Newell; Harry Scarbrough; Donald Hislop

    1999-01-01

    Begins with a critical review of the literature on knowledge management, arguing that its focus on IT to create a network structure may limit its potential for encouraging knowledge sharing across social communities. Two cases of interactive innovation are contrasted. One focused almost entirely on using IT (intranet) for knowledge sharing, resulting in a plethora of independent intranets which reinforced

  20. Attractor Metabolic Networks

    PubMed Central

    De la Fuente, Ildefonso M.; Cortes, Jesus M.; Pelta, David A.; Veguillas, Juan

    2013-01-01

    Background The experimental observations and numerical studies with dissipative metabolic networks have shown that cellular enzymatic activity self-organizes spontaneously leading to the emergence of a Systemic Metabolic Structure in the cell, characterized by a set of different enzymatic reactions always locked into active states (metabolic core) while the rest of the catalytic processes are only intermittently active. This global metabolic structure was verified for Escherichia coli, Helicobacter pylori and Saccharomyces cerevisiae, and it seems to be a common key feature to all cellular organisms. In concordance with these observations, the cell can be considered a complex metabolic network which mainly integrates a large ensemble of self-organized multienzymatic complexes interconnected by substrate fluxes and regulatory signals, where multiple autonomous oscillatory and quasi-stationary catalytic patterns simultaneously emerge. The network adjusts the internal metabolic activities to the external change by means of flux plasticity and structural plasticity. Methodology/Principal Findings In order to research the systemic mechanisms involved in the regulation of the cellular enzymatic activity we have studied different catalytic activities of a dissipative metabolic network under different external stimuli. The emergent biochemical data have been analysed using statistical mechanic tools, studying some macroscopic properties such as the global information and the energy of the system. We have also obtained an equivalent Hopfield network using a Boltzmann machine. Our main result shows that the dissipative metabolic network can behave as an attractor metabolic network. Conclusions/Significance We have found that the systemic enzymatic activities are governed by attractors with capacity to store functional metabolic patterns which can be correctly recovered from specific input stimuli. The network attractors regulate the catalytic patterns, modify the efficiency in the connection between the multienzymatic complexes, and stably retain these modifications. Here for the first time, we have introduced the general concept of attractor metabolic network, in which this dynamic behavior is observed. PMID:23554883

  1. ONE: The Ohio Network Emulator

    Microsoft Academic Search

    Adam Caldwell; Mark Allman; Shawn Ostermann

    1996-01-01

    Studying network protocols and distributed applications in real networks can bedifficult due to the need for complex topologies, hard to find physical channels (e.g.,satellite channels), and conditions beyond the control of a researcher (e.g., queue sizes).Network emulators can provide a controlled and reproducible environment for networktesting. This paper discusses ONE, a network emulator we have written and tested.1 IntroductionNetwork emulators,

  2. Neural networks for process prediction

    SciTech Connect

    Morrison, S.; Qin, J. [Fisher-Rosemount Systems, Inc., Austin, TX (United States)

    1995-12-31

    Neural networks are powerful tools to model complex nonlinear behavior from process data. An intelligent sensor is a use of neural network to provide the same information a physical sensor would give. The benefits of using neural networks as intelligent sensors fall into four different categories, which are outlined in this paper. This paper also describes how backpropagation neural networks run, and highlites several important issues that engineers need to keep in mind when building a neural network.

  3. Trust Maximization in Social Networks

    NASA Astrophysics Data System (ADS)

    Zhan, Justin; Fang, Xing

    Trust is a human-related phenomenon in social networks. Trust research on social networks has gained much attention on its usefulness, and on modeling propagations. There is little focus on finding maximum trust in social networks which is particularly important when a social network is oriented by certain tasks. In this paper, we propose a trust maximization algorithm based on the task-oriented social networks.

  4. All-Optical Network Coding

    Microsoft Academic Search

    Eric D. Manley; Jitender S. Deogun; Lisong Xu; Dennis R. Alexander

    2010-01-01

    We investigate the application of network coding to all-optical networks from both the algorithmic and infrastructural perspectives. We study the effectiveness of using network coding for optical-layer dedicated protection of multicast traffic that provides robustness against link failures in the network. We present a heuristic for solving this problem and compare it with both inefficient optimal methods and non-network-coding approaches.

  5. Interactome Networks and Human Disease

    PubMed Central

    Vidal, Marc; Cusick, Michael E.; Barabási, Albert-László

    2011-01-01

    Complex biological systems and cellular networks may underlie most genotype to phenotype relationships. Here we review basic concepts in network biology, discussing different types of interactome networks and the insights that can come from analyzing them. We elaborate on why interactome networks are important to consider in biology, how they can be mapped and integrated with each other, what global properties are starting to emerge from interactome network models, and how these properties may relate to human disease. PMID:21414488

  6. Network Security: Concepts

    NSDL National Science Digital Library

    Jain, Raj

    Prepared and presented by Professor Raj Jain at Washington University in St. Louis, this series of presentations is designed to introduce computer science students to the fundamentals of network security. Visitors have the option of choosing to download or view the presentations with audio, as individual slides only, or as a single PDF document. Topics here include: security requirements, public key encryption, digital signatures, and confidentiality. This is an excellent site for educators to use in the classroom or as a supplementary resource to introduce students to computer network security. Students may also wish to view or download the presentations to learn the basic concepts of network security.

  7. Learning In networks

    NASA Technical Reports Server (NTRS)

    Buntine, Wray L.

    1995-01-01

    Intelligent systems require software incorporating probabilistic reasoning, and often times learning. Networks provide a framework and methodology for creating this kind of software. This paper introduces network models based on chain graphs with deterministic nodes. Chain graphs are defined as a hierarchical combination of Bayesian and Markov networks. To model learning, plates on chain graphs are introduced to model independent samples. The paper concludes by discussing various operations that can be performed on chain graphs with plates as a simplification process or to generate learning algorithms.

  8. Local area gigabit networking

    SciTech Connect

    Tolmie, D.E.

    1991-01-01

    Computer networks must become faster as the equipment that is being interconnected increases in power and performance. Ethemet, with a 10 Mbit/s speed, seemed awesome a few years ago, but is beginning to show its age as more machines are tied together, and workstations attain the power of yesterdays mainframes. Networks using gigabit speeds are just starting to become available and offer a whole new set of problems and potential. This paper addresses what the higher speeds are being used for, the ''standards'' efforts specifying the higher speed channels, the network architectures being proposed, and some of the open problems requiring extensive further work. 13 refs., 2 figs.

  9. NACK Network Webinars

    NSDL National Science Digital Library

    On this page, viewers will find a collection of webinars created by the NACK network which would be educational for instructors and students alike. "The NACK Network offers a live webinar, hosted by MATEC NetWorks, every month to engage and educate those of you that are interested in learning more about nanotechnology related topics." A suite of current webinars, as well as archived webinars dating back to 2009, are available on this page. For each webinar, a brief synopsis, slides, recording, and a handout are offered. 

  10. Challenges of Social Cognitive Network Science: Network Science Collaborative Technology Alliance Perspective

    E-print Network

    Varela, Carlos

    Challenges of Social Cognitive Network Science: Network Science Collaborative Technology Alliance Research Center of the Network Science Collaborative Technology Alliance. The focus is on potential impact of social cognitive network science. Keywords--social cognitive networks; communities; trust; team

  11. Fluvial network organization imprints on microbial co-occurrence networks

    PubMed Central

    Widder, Stefanie; Besemer, Katharina; Singer, Gabriel A.; Ceola, Serena; Bertuzzo, Enrico; Quince, Christopher; Sloan, William T.; Rinaldo, Andrea; Battin, Tom J.

    2014-01-01

    Recent studies highlight linkages among the architecture of ecological networks, their persistence facing environmental disturbance, and the related patterns of biodiversity. A hitherto unresolved question is whether the structure of the landscape inhabited by organisms leaves an imprint on their ecological networks. We analyzed, based on pyrosequencing profiling of the biofilm communities in 114 streams, how features inherent to fluvial networks affect the co-occurrence networks that the microorganisms form in these biofilms. Our findings suggest that hydrology and metacommunity dynamics, both changing predictably across fluvial networks, affect the fragmentation of the microbial co-occurrence networks throughout the fluvial network. The loss of taxa from co-occurrence networks demonstrates that the removal of gatekeepers disproportionately contributed to network fragmentation, which has potential implications for the functions biofilms fulfill in stream ecosystems. Our findings are critical because of increased anthropogenic pressures deteriorating stream ecosystem integrity and biodiversity. PMID:25136087

  12. Identification of influential nodes in network of networks

    E-print Network

    Li, Meizhu; Liu, Qi; Deng, Yong

    2015-01-01

    The network of networks(NON) research is focused on studying the properties of n interdependent networks which is ubiquitous in the real world. Identifying the influential nodes in the network of networks is theoretical and practical significance. However, it is hard to describe the structure property of the NON based on traditional methods. In this paper, a new method is proposed to identify the influential nodes in the network of networks base on the evidence theory. The proposed method can fuse different kinds of relationship between the network components to constructed a comprehensive similarity network. The nodes which have a big value of similarity are the influential nodes in the NON. The experiment results illustrate that the proposed method is reasonable and significant

  13. Network Motifs: Simple Building Blocks of Complex Networks

    NASA Astrophysics Data System (ADS)

    Milo, R.; Shen-Orr, S.; Itzkovitz, S.; Kashtan, N.; Chklovskii, D.; Alon, U.

    2002-10-01

    Complex networks are studied across many fields of science. To uncover their structural design principles, we defined ``network motifs,'' patterns of interconnections occurring in complex networks at numbers that are significantly higher than those in randomized networks. We found such motifs in networks from biochemistry, neurobiology, ecology, and engineering. The motifs shared by ecological food webs were distinct from the motifs shared by the genetic networks of Escherichia coli and Saccharomyces cerevisiae or from those found in the World Wide Web. Similar motifs were found in networks that perform information processing, even though they describe elements as different as biomolecules within a cell and synaptic connections between neurons in Caenorhabditis elegans. Motifs may thus define universal classes of networks. This approach may uncover the basic building blocks of most networks.

  14. Introduction to Network Security

    NSDL National Science Digital Library

    Curtin, Matt

    Provided by Internet Security Company Interhack, and written by Matt Curtin, this sixteen-page document is available in HTML, PDF, and Postscript formats. The document includes some history of networking, as well as an introduction to TCP/IP and internetworking. The document then goes on to consider risk management, network threats, firewalls, and more special-purpose secure networking devices. According to the abstract, the author hopes that â??the reader will have a wider perspective on security in general, and better understand how to reduce and manage risk personally, at home, and in the workplace.â? This is a great resource for students and teachers of introductory computer network security and cyber security courses.

  15. Actively stressed marginal networks

    E-print Network

    M. Sheinman; C. P. Broedersz; F. C. MacKintosh

    2012-06-19

    We study the effects of motor-generated stresses in disordered three dimensional fiber networks using a combination of a mean-field, effective medium theory, scaling analysis and a computational model. We find that motor activity controls the elasticity in an anomalous fashion close to the point of marginal stability by coupling to critical network fluctuations. We also show that motor stresses can stabilize initially floppy networks, extending the range of critical behavior to a broad regime of network connectivities below the marginal point. Away from this regime, or at high stress, motors give rise to a linear increase in stiffness with stress. Finally, we demonstrate that our results are captured by a simple, constitutive scaling relation highlighting the important role of non-affine strain fluctuations as a susceptibility to motor stress.

  16. Modeling Radio Networks

    E-print Network

    Lynch, Nancy

    2009-06-04

    We describe a modeling framework and collection of foundational composition results for the study of probabilistic distributed algorithms in synchronous radio networks. Existing results in this setting rely on informal ...

  17. Yeast Education Network

    NSDL National Science Digital Library

    The Yeast Education Network provides a variety of resources to facilitate use of the budding yeast Saccharomyces cerevisiae in undergraduate science curricula. Laboratory, classroom, and computer-based activities can be used with college and advanced high school students.

  18. Network coding meets TCP

    E-print Network

    Barros, Joao

    We propose a mechanism that incorporates network coding into TCP with only minor changes to the protocol stack, thereby allowing incremental deployment. In our scheme, the source transmits random linear combinations of ...

  19. The expandable network disk

    E-print Network

    Muthitacharoen, Athicha, 1976-

    2008-01-01

    This thesis presents a virtual disk cluster called END, the Expandable Network Disk. END aggregates storage on a cluster of servers into a single virtual disk. END's main goals are to offer good performance during normal ...

  20. The Deep Space Network

    NASA Technical Reports Server (NTRS)

    1979-01-01

    Progress on the Deep Space Network (DSN) supporting research and technology, advanced development, engineering and implementation, and DSN operations is presented. The functions and facilities of the DSN are described.

  1. Multimedia wireless networking

    NASA Astrophysics Data System (ADS)

    Jain, Rajeev; Alwan, Abeer; Gerla, Mario; Kleinrock, Leonard; Villasenor, John D.; Belzer, Ben; Boring, Walter; Molloy, Stephen; Nazareth, Sean; Siqueira, Marcio; Short, Joel; Tsai, Jack

    1996-03-01

    Current wireless network systems (e.g. metropolitan cellular) are constrained by fixed bandwidth allocations and support only a narrow range of services (voice and low bit-rate data). To overcome these constraints and advance the state of the art in wireless multimedia communications, we are developing variable-rate video and speech compression algorithms, and wireless node architectures that will enable peer-to-peer multimedia networking even with very low bandwidth. To support this objective, each wireless node must support new applications (for multimedia), advances in networking and source coding to support multimedia under limited bandwidth conditions (wireless), advances in physical layer design to support robust, low power, high packet throughput links, low power DSP for multimedia compression, and an architectural strategy to integrate these components into an efficient node. The algorithms and architectures to support this functionality are presented here, together with some preliminary results on network performance.

  2. Tools for Network Dynamics

    Microsoft Academic Search

    R. VILELA MENDES

    2005-01-01

    Networks have been studied mainly by statistical methods which em- phasize their topological structure. Here one collects some mathematical tools and results which might be useful to study both the dynamics of

  3. Growing networks with superjoiners

    NASA Astrophysics Data System (ADS)

    Jabr-Hamdan, Ameerah; Sun, Jie; ben-Avraham, Daniel

    2014-11-01

    We study the Krapivsky-Redner (KR) network growth model, but where new nodes can connect to any number of existing nodes, m , picked from a power-law distribution p (m ) ˜m-? . Each of the m new connections is still carried out as in the KR model with probability redirection r (corresponding to degree exponent ?KR=1 +1 /r in the original KR model). The possibility to connect to any number of nodes resembles a more realistic type of growth in several settings, such as social networks, routers networks, and networks of citations. Here we focus on the in-, out-, and total-degree distributions and on the potential tension between the degree exponent ? , characterizing new connections (outgoing links), and the degree exponent ?KR(r ) dictated by the redirection mechanism.

  4. National Outreach Network (NON)

    Cancer.gov

    Build and sustain a network that connects NCI-supported outreach, community education, and dissemination efforts with community-based cancer health disparities research and training programs in at-risk and underrepresented communities.

  5. Essays on Network Formation 

    E-print Network

    Mueller, William Graham

    2012-10-19

    This dissertation contains two essays which examine the roles that individual incentives, competition, and information play in network formation. In the first essay, I examine a model in which two competing groups offer ...

  6. Compressively sensed complex networks.

    SciTech Connect

    Dunlavy, Daniel M.; Ray, Jaideep; Pinar, Ali

    2010-07-01

    The aim of this project is to develop low dimension parametric (deterministic) models of complex networks, to use compressive sensing (CS) and multiscale analysis to do so and to exploit the structure of complex networks (some are self-similar under coarsening). CS provides a new way of sampling and reconstructing networks. The approach is based on multiresolution decomposition of the adjacency matrix and its efficient sampling. It requires preprocessing of the adjacency matrix to make it 'blocky' which is the biggest (combinatorial) algorithm challenge. Current CS reconstruction algorithm makes no use of the structure of a graph, its very general (and so not very efficient/customized). Other model-based CS techniques exist, but not yet adapted to networks. Obvious starting point for future work is to increase the efficiency of reconstruction.

  7. Systematic wireless network coding

    E-print Network

    Shrader, Brooke E.

    We present a systematic network coding strategy for cooperative communication, in which some nodes may replicate-and-forward packets in addition to sending random linear combinations of the packets. We argue that if this ...

  8. Multitasking Associative Networks

    NASA Astrophysics Data System (ADS)

    Agliari, Elena; Barra, Adriano; Galluzzi, Andrea; Guerra, Francesco; Moauro, Francesco

    2012-12-01

    We introduce a bipartite, diluted and frustrated, network as a sparse restricted Boltzmann machine and we show its thermodynamical equivalence to an associative working memory able to retrieve several patterns in parallel without falling into spurious states typical of classical neural networks. We focus on systems processing in parallel a finite (up to logarithmic growth in the volume) amount of patterns, mirroring the low-level storage of standard Amit-Gutfreund-Sompolinsky theory. Results obtained through statistical mechanics, the signal-to-noise technique, and Monte Carlo simulations are overall in perfect agreement and carry interesting biological insights. Indeed, these associative networks pave new perspectives in the understanding of multitasking features expressed by complex systems, e.g., neural and immune networks.

  9. Multitasking associative networks.

    PubMed

    Agliari, Elena; Barra, Adriano; Galluzzi, Andrea; Guerra, Francesco; Moauro, Francesco

    2012-12-28

    We introduce a bipartite, diluted and frustrated, network as a sparse restricted Boltzmann machine and we show its thermodynamical equivalence to an associative working memory able to retrieve several patterns in parallel without falling into spurious states typical of classical neural networks. We focus on systems processing in parallel a finite (up to logarithmic growth in the volume) amount of patterns, mirroring the low-level storage of standard Amit-Gutfreund-Sompolinsky theory. Results obtained through statistical mechanics, the signal-to-noise technique, and Monte Carlo simulations are overall in perfect agreement and carry interesting biological insights. Indeed, these associative networks pave new perspectives in the understanding of multitasking features expressed by complex systems, e.g., neural and immune networks. PMID:23368622

  10. NSIUWG: Science networking retreat

    NASA Technical Reports Server (NTRS)

    Hart, Jim

    1991-01-01

    The purpose of this session was to study and identify alternatives to be recommended for the science networking areas of vision; roles and responsibilities; and technical approach and transition. This presentation is represented by charts and viewgraphs only.

  11. Solar Buildings Research Network

    Microsoft Academic Search

    M. Styliano; A. Athienitis

    2006-01-01

    The following topics are discussed: buildings' impact on green house gas emissions;unexploited potential of solar energy; partners and linkages; network governance; strategic planning; technology transfer; solar buildings; and benefits to Canada.

  12. Netiquettes for Networkers.

    ERIC Educational Resources Information Center

    McMurdo, George

    1995-01-01

    Presents 20 networking etiquette guidelines taken from electronic and print sources. Highlights include focusing on one subject, condensing messages, editing quotes, spelling and grammar, typography, mistakes, acronyms, humor, researching discussion groups, intellectual property and copyright, manners, ethics, and damage. (AEF)

  13. Computers, Networks and Work.

    ERIC Educational Resources Information Center

    Sproull, Lee; Kiesler, Sara

    1991-01-01

    Discussed are how computer networks can affect the nature of work and the relationships between managers and employees. The differences between face-to-face exchanges and electronic interactions are described. (KR)

  14. Spectral Alignment of Networks

    E-print Network

    Feizi, Soheil

    2015-02-18

    Network alignment refers to the problem of finding a bijective mapping across vertices of two or more graphs to maximize the number of overlapping edges and/or to minimize the number of mismatched interactions across ...

  15. International Cancer Screening Network

    Cancer.gov

    Skip to Main Content Search International Cancer Screening Network Sponsored by the National Cancer Institute Working Together to Evaluate Cancer Screening and Improve Outcomes Internationally About the ICSN Overview Participating Countries Contact

  16. The Deep Space Network

    NASA Technical Reports Server (NTRS)

    1977-01-01

    The various systems and subsystems are discussed for the Deep Space Network (DSN). A description of the DSN is presented along with mission support, program planning, facility engineering, implementation and operations.

  17. The MAD Scientist Network

    NSDL National Science Digital Library

    The Mad Scientist Network, provided by Washington University at St. Louis Medical School, is a Web based "ask a scientist" forum. You ask a question, and a scientist answers it. Answers are usually concise. The expert scientists include high school teachers, university faculty, and others. Both questions and answers are submitted via Web forms. A browsable and searchable question and answer archive is maintained. Scientists interested in joining the Mad Scientist Network will find information at the site. The Mad Scientist Network is part of the St. Louis Science Education Network. http://medinfo.wustl.edu/~ysp/MSN/ Scientists interested in participating: http://medicine.wustl.edu/~ysp/MSN/join/ List of "Mad Scientists": http://medicine.wustl.edu/cgi/cgiwrap.cgi/~ysp/mad/mad.scilist

  18. Search using social networks

    E-print Network

    Ammar, Ammar (Ammar T.)

    2010-01-01

    In this thesis, we present an approach to the problem of personalized web search which makes use of the searcher's social network, in addition to the hyper-link based score used in most search engines. This combination of ...

  19. The Colombia Seismological Network

    NASA Astrophysics Data System (ADS)

    Blanco Chia, J. F.; Poveda, E.; Pedraza, P.

    2013-05-01

    The latest seismological equipment and data processing instrumentation installed at the Colombia Seismological Network (RSNC) are described. System configuration, network operation, and data management are discussed. The data quality and the new seismological products are analyzed. The main purpose of the network is to monitor local seismicity with a special emphasis on seismic activity surrounding the Colombian Pacific and Caribbean oceans, for early warning in case a Tsunami is produced by an earthquake. The Colombian territory is located at the South America northwestern corner, here three tectonic plates converge: Nazca, Caribbean and the South American. The dynamics of these plates, when resulting in earthquakes, is continuously monitored by the network. In 2012, the RSNC registered in 2012 an average of 67 events per day; from this number, a mean of 36 earthquakes were possible to be located well. In 2010 the network was also able to register an average of 67 events, but it was only possible to locate a mean of 28 earthquakes daily. This difference is due to the expansion of the network. The network is made up of 84 stations equipped with different kind of broadband 40s, 120s seismometers, accelerometers and short period 1s sensors. The signal is transmitted continuously in real-time to the Central Recording Center located at Bogotá, using satellite, telemetry, and Internet. Moreover, there are some other stations which are required to collect the information in situ. Data is recorded and processed digitally using two different systems, EARTHWORM and SEISAN, which are able to process and share the information between them. The RSNC has designed and implemented a web system to share the seismological data. This innovative system uses tools like Java Script, Oracle and programming languages like PHP to allow the users to access the seismicity registered by the network almost in real time as well as to download the waveform and technical details. The coverage of the RSNC network is presented along with the improvement in earthquake location and the quality of the data. New tools to calculate moment magnitude and focal mechanism are implemented as a result of the network expansion. The principal seismic sources in Colombia and the challenges for the future of the network are discussed.

  20. Covert Communication Networks

    E-print Network

    Nix, Timothy Glen

    2013-08-02

    to the Browser . . . . . . . . . . . . . . . . . . . . 140 9.6.2 Connecting to the Proxy . . . . . . . . . . . . . . . . . . . . . 140 9.6.3 The Intermediate Nodes . . . . . . . . . . . . . . . . . . . . . 141 9.6.4 Results... of network are signi cantly more stringent than for traditional privacy and anonymity networks such as Tor [17]. Traditional means of Internet communications, such as email and instant messaging, would not be pro- tected. Though encrypted tra c would...

  1. Modelling neural networks

    NASA Astrophysics Data System (ADS)

    Chakrabarti, Bikas K.; Dasgupta, Prabir K.

    1992-07-01

    We review here briefly some of our recent studies on neural network modelling. We discuss the studies on relaxation and growth of correlation in the Hopfield model, increase in memory loading capacity with an extended Hopfield-like model with delayed dynamics, the prediction capability of time series with a multi-layered network with supervised learning and studies on some generalised versions of the travelling salesman problem.

  2. Evolution of networks

    Microsoft Academic Search

    S. N. Dorogovtsev; J. F. F. Mendes

    2002-01-01

    We review the recent fast progress in statistical physics of evolving\\u000anetworks. Interest has focused mainly on the structural properties of random\\u000acomplex networks in communications, biology, social sciences and economics. A\\u000anumber of giant artificial networks of such a kind came into existence\\u000arecently. This opens a wide field for the study of their topology, evolution,\\u000aand complex processes

  3. Combining Energy Networks

    Microsoft Academic Search

    Jan Abrell; Hannes Weigt

    Electricity markets depend on upstream energy markets to supply the fuels needed for generation. Since these markets rely\\u000a on networks, congestion in one can quickly produce changes in another. In this paper we develop a combined partial equilibrium\\u000a market model which includes the interactions of natural gas and electricity networks. We apply the model to a stylized representation\\u000a of Europe’s

  4. Bolivian Seismic Network

    NASA Astrophysics Data System (ADS)

    Minaya, E.; Rougon, P.; Valero, D.; Fernandez, G.; Lazaro, E.; Cano, W.

    2007-05-01

    One of the biggest challenges into the Seismic Network of Bolivia, composed of seven stations, is to connect all the differents characteristic of them. The Observatory San Calixto, network operator, is one of the few private seismic observatories in the world and for this reason is working only with agreement support or extern cooperation. This problem needs a promptly solution to obtain data system more convenient, in a real time, more effective and compatible with a future extension network. Now, we have differences in the equipment and transmission too. Two of our network stations, are part of the IMS (International System of Data), the information are transmitted by telemetry way from Primary Station PS6 (LPAZ) to OSC, and then by Vsat to IMS and by optic fiber to AFTAC. The auxiliary seismic station AS08 (SIV) sends information to DASE France by satellite way, and then DASE transmits to the IMS, and to the OSC by Internet. Similar situation is used for another station: MOC. The data of the other four stations are transmitted by telemetry to the OSC center, but here the difference with the other stations is that they are working with analogy system. This network does not cover all the Bolivian territory for a completed monitoring of the seismic activity of the country. For this reason it is very important for Bolivia to extend the network with installation of other stations and a project for the characteristic compatibility (formats specially) of this news stations with the actual stations and temporally stations. Temporally stations are mainly used to support the network and to obtain the evaluation of micro activity in some areas that have a possible seismic threat and because of the actual network distribution where the activity is unknown for us.

  5. Majority Gate Networks

    Microsoft Academic Search

    S. Amarel; G. Cooke; R. O. Winder

    1964-01-01

    This paper presents methods for realizing simple threshold functions of n arguments by networks of k-input majority gates, where k?n. An optimal network realization of the 5-argument majority function using 3-input majority gates is given, and it is then generalized by steps with realizations for the (2n-l)-argument majority function (where n = 3, 4, ...) using (2n-3)-input majority gates, and

  6. Global Telescope Network Website

    NSDL National Science Digital Library

    2005-06-14

    This Web site contains information for both partners (those with their own telescopes) and associates (those who wish to use a network telescope.) The purpose of the Global Telescope Network (GTN) is to use small telescopes to obtain ground-based observations of high-energy objects of interest to Swift, GLAST (renamed Fermi in 2008) and XMM-Newton missions. It is used both by formal educators working with students and by amateur astronomers.

  7. Leaf Pack Network

    NSDL National Science Digital Library

    The Leaf Pack Network (LPN) is a network of teachers and students investigating their local stream ecosystems by participating in the leaf pack experiment, which involves creating an artificial leaf pack (dry leaves in a mesh bag), immersing it in a stream for 3-4 weeks, and examining it for signs of aquatic insects as indicators of stream health. Participating classrooms share their data through the internet. This activity highlights the connection between streamside forests and the ecology of rivers and streams.

  8. Wireless Multimedia Sensor Networks

    Microsoft Academic Search

    Ivan Lee; William Shaw; Xiaoming Fan

    \\u000a The emergence of low-cost and mature technologies in wireless communication, visual sensor devices, and digital signal processing\\u000a facilitate of wireless multimedia sensor networks (WMSN). Like sensor networks which respond to sensory information such as\\u000a temperature and humidity, WMSN interconnects autonomous devices for capturing and processing video and audio sensory information.\\u000a This survey highlights the following topics (1) a summary of

  9. Insecurity of Wireless Networks

    Microsoft Academic Search

    Frederick T Sheldon; John Mark Weber; Seong-Moo Yoo; W. David Pan

    2012-01-01

    Wireless is a powerful core technology enabling our global digital infrastructure. Wi-Fi networks are susceptible to attacks on Wired Equivalency Privacy, Wi-Fi Protected Access (WPA), and WPA2. These attack signatures can be profiled into a system that defends against such attacks on the basis of their inherent characteristics. Wi-Fi is the standard protocol for wireless networks used extensively in US

  10. Electronic Neural Networks

    NASA Technical Reports Server (NTRS)

    Lambe, John; Moopen, Alexander; Thakoor, Anilkumar P.

    1988-01-01

    Memory based on neural network models content-addressable and fault-tolerant. System includes electronic equivalent of synaptic network; particular, matrix of programmable binary switching elements over which data distributed. Switches programmed in parallel by outputs of serial-input/parallel-output shift registers. Input and output terminals of bank of high-gain nonlinear amplifiers connected in nonlinear-feedback configuration by switches and by memory-prompting shift registers.

  11. Management of coalition sensor networks

    NASA Astrophysics Data System (ADS)

    Verma, Dinesh Chandra; Brown, Theodore; Ortega, Carolyn

    2010-04-01

    The management of sensor networks in coalition settings has been treated in a piecemeal fashion in the current literature without taking a comprehensive look at the complete life cycle of coalition networks, and determining the different aspects of network management that need to be taken into account for the management of sensor networks in those contexts. In this paper, we provide a holistic approach towards managing sensor networks encountered in the context of coalition operations. We describe how the sensor networks in a coalition ought to be managed at various stages of the life cycle, and the different operations that need to be taken into account for managing various aspects of the networks. In particular, we look at the FCAPS model for network management, and assess the applicability of the FCAPS model to the different aspects of sensor network management in a coalition setting.

  12. Social Network Visualization in Epidemiology

    PubMed Central

    Christakis, Nicholas A.; Fowler, James H.

    2010-01-01

    Epidemiological investigations and interventions are increasingly focusing on social networks. Two aspects of social networks are relevant in this regard: the structure of networks and the function of networks. A better understanding of the processes that determine how networks form and how they operate with respect to the spread of behavior holds promise for improving public health. Visualizing social networks is a key to both research and interventions. Network images supplement statistical analyses and allow the identification of groups of people for targeting, the identification of central and peripheral individuals, and the clarification of the macro-structure of the network in a way that should affect public health interventions. People are inter-connected and so their health is inter-connected. Inter-personal health effects in social networks provide a new foundation for public health. PMID:22544996

  13. Transcriptional network classifiers

    PubMed Central

    Chang, Hsun-Hsien; Ramoni, Marco F

    2009-01-01

    Background Gene interactions play a central role in transcriptional networks. Many studies have performed genome-wide expression analysis to reconstruct regulatory networks to investigate disease processes. Since biological processes are outcomes of regulatory gene interactions, this paper develops a system biology approach to infer function-dependent transcriptional networks modulating phenotypic traits, which serve as a classifier to identify tissue states. Due to gene interactions taken into account in the analysis, we can achieve higher classification accuracy than existing methods. Results Our system biology approach is carried out by the Bayesian networks framework. The algorithm consists of two steps: gene filtering by Bayes factor followed by collinearity elimination via network learning. We validate our approach with two clinical data. In the study of lung cancer subtypes discrimination, we obtain a 25-gene classifier from 111 training samples, and the test on 422 independent samples achieves 95% classification accuracy. In the study of thoracic aortic aneurysm (TAA) diagnosis, 61 samples determine a 34-gene classifier, whose diagnosis accuracy on 33 independent samples achieves 82%. The performance comparisons with three other popular methods, PCA/LDA, PAM, and Weighted Voting, confirm that our approach yields superior classification accuracy and a more compact signature. Conclusions The system biology approach presented in this paper is able to infer function-dependent transcriptional networks, which in turn can classify biological samples with high accuracy. The validation of our classifier using clinical data demonstrates the promising value of our proposed approach for disease diagnosis. PMID:19761563

  14. Stochastic pooling networks

    NASA Astrophysics Data System (ADS)

    McDonnell, Mark D.; Amblard, Pierre-Olivier; Stocks, Nigel G.

    2009-01-01

    We introduce and define the concept of a stochastic pooling network (SPN), as a model for sensor systems where redundancy and two forms of 'noise'—lossy compression and randomness—interact in surprising ways. Our approach to analysing SPNs is information theoretic. We define an SPN as a network with multiple nodes that each produce noisy and compressed measurements of the same information. An SPN must combine all these measurements into a single further compressed network output, in a way dictated solely by naturally occurring physical properties—i.e. pooling—and yet cause no (or negligible) reduction in mutual information. This means that SPNs exhibit redundancy reduction as an emergent property of pooling. The SPN concept is applicable to examples in biological neural coding, nanoelectronics, distributed sensor networks, digital beamforming arrays, image processing, multiaccess communication networks and social networks. In most cases the randomness is assumed to be unavoidably present rather than deliberately introduced. We illustrate the central properties of SPNs for several case studies, where pooling occurs by summation, including nodes that are noisy scalar quantizers, and nodes with conditionally Poisson statistics. Other emergent properties of SPNs and some unsolved problems are also briefly discussed.

  15. Controllability of Complex Networks

    NASA Astrophysics Data System (ADS)

    Liu, Yang; Slotine, Jean-Jacques; Barabasi, Albert-Laszlo

    2011-03-01

    The ultimate proof of our understanding of natural or technological systems is reflected in our ability to control them. While control theory offers mathematical tools to steer engineered systems towards a desired state, we lack a general framework to control complex self-organized systems, like the regulatory network of a cell or the Internet. Here we develop analytical tools to study the controllability of an arbitrary complex directed network, identifying the set of driver nodes whose time-dependent control can guide the system's dynamics. We apply these tools to real and model networks, finding that sparse inhomogeneous networks, which emerge in many real complex systems, are the most difficult to control. In contrast, dense and homogeneous networks can be controlled via a few driver nodes. Counterintuitively, we find that in both model and real systems the driver nodes tend to avoid the hubs. We show that the robustness of control to link failure is determined by a core percolation problem, helping us understand why many complex systems are relatively insensitive to link deletion. The developed approach offers a framework to address the controllability of an arbitrary network, representing a key step towards the eventual control of complex systems.

  16. Network basics for telemedicine.

    PubMed

    Gemmill, Jill

    2005-01-01

    Early telemedicine networks employed dedicated telecommunications circuits (e.g. leased digital lines) in which the sender and receiver were connected by a private circuit. More recently, the Internet has become widely available for general use, including telemedicine. The Internet was engineered to permit network paths to be shared by all users, so data transmission is fundamentally different from traditional, circuit-switched networks. Early telemedicine applications demonstrated the feasibility of Internet Protocol transmission. The basic performance criteria to use in evaluating newer digital communications technologies that carry both voice and data are: (1) bandwidth; (2) packet loss; (3) end-to-end delay; (4) jitter; (5) privacy and security. Network engineering involves performance trade-offs between the hardware, architecture, security and the budget available. A telemedicine application may be running over a network whose design is entirely under the user's control, or the application may employ some part of the Internet whose design is unknown to the user. If an application is not running to satisfaction, then a network engineer should be consulted. PMID:15829050

  17. Security and privacy in emerging wireless networks [Guest Editorial

    Microsoft Academic Search

    Guohong Cao; J.-P. Hubaux; Yongdae Kim; Yanchao Zhang

    2010-01-01

    Rapid advances in wireless ad hoc networking have extended its application from mobile ad hoc networks and wireless sensor networks to emerging wireless networks including wireless mesh networks, delay-tolerant networks, vehicular networks, and urban sensing networks. While facilitating ubiquitous network access as well as social interactions, these emerging networks are particularly vulnerable to numerous privacy and security threats. For example,

  18. A Survey of Computer Network Topology and Analysis Examples

    E-print Network

    Jain, Raj

    Spanning Tree, Graph Theory, Bus Network Topology, Ring Network Topology, Star Network Topology, Tree Topologies 2.1 Bus Network Topology 2.2 Ring Network Topology 2.3 Star Network Topology 2.4 Tree Network, Star, Tree and Mesh Network Topologies are presented. 2.1 Bus Network Topology In Bus Network Topology

  19. Network coding for speedup in switches

    E-print Network

    Kim, MinJi, M. Eng. Massachusetts Institute of Technology

    2007-01-01

    Network coding, which allows mixing of data at intermediate network nodes, is known to increase the throughput of networks. In particular, it is known that linear network coding in a crossbar switch can sustain traffic ...

  20. GERT simulation program for GERT network analysis

    NASA Technical Reports Server (NTRS)

    Alan, A.; Pritsker, B.

    1968-01-01

    GERT Simulation Program simulates GERT networks to obtain statistics on specified nodes of the network. It performs sampling experiments to determine which branches of the network are taken and how long it takes to traverse a branch of the network.

  1. Cooperative Diversity Routing in Wireless Networks

    E-print Network

    Paris-Sud XI, Université de

    Cooperative Diversity Routing in Wireless Networks Mostafa Dehghan and Majid Ghaderi Department routing, cooperative commu- nication, cooperative diversity, wireless networks. I. INTRODUCTION Energy efficiency is a challenging problem in wireless networks, especially in ad hoc and sensor networks, where

  2. Scalable Affiliation Recommendation using Auxiliary Networks

    E-print Network

    Ghosh, Joydeep

    - ommendation. In this paper, we show that information from the friendship network can indeed be fruitfully established by the members of the network. Thus, two networks exist simultaneously: the friendship network

  3. Supporting Multiple Protection Strategies in Optical Networks

    E-print Network

    Ramasubramanian, Srinivasan

    networks, which is in general appli- cable to any connection-oriented network. The capacity available are expected to employ connection-oriented service paradigm. In such backbone networks, the major network op

  4. Whether Information Network Supplements Friendship Network

    E-print Network

    Miao, Lili; Nie, Da-Chen; Cai, Shi-Min

    2014-01-01

    Homophily is a significant mechanism for link prediction in complex network, of which principle describes that people with similar profiles or experiences tend to tie with each other. In a multi-relationship network, friendship among people has been utilized to reinforce similarity of taste for recommendation system whose basic idea is similar to homophily, yet how the taste inversely affects friendship prediction is little discussed. This paper contributes to address the issue by analyzing two benchmark datasets both including user's behavioral information of taste and friendship based on the principle of homophily. It can be found that the creation of friendship tightly associates with personal taste. Especially, the behavioral information of taste involving with popular objects is much more effective to improve the performance of friendship prediction. However, this result seems to be contradictory to the finding in [Q.M. Zhang, et al., PLoS ONE 8(2013)e62624] that the behavior information of taste involvi...

  5. The Complexity of Terrorist Networks

    NASA Astrophysics Data System (ADS)

    Fellman, Philip Vos

    Complexity science affords a number of novel tools for examining terrorism, particularly network analysis and NK-Boolean fitness landscapes. The following paper explores various aspects of terrorist networks which can be illuminated through applications of non-linear dynamical systems modeling to terrorist network structures. Of particular interest are some of the emergent properties of terrorist networks as typified by the 9-11 hijackers network, properties of centrality, hierarchy and distance, as well as ways in which attempts to disrupt the transmission of information through terrorist networks may be expected to produce greater or lesser levels of fitness in those organizations.

  6. Border detection in complex networks

    NASA Astrophysics Data System (ADS)

    Travençolo, Bruno A. N.; Viana, Matheus Palhares; Costa, Luciano da Fontoura

    2009-06-01

    One important issue implied by the finite nature of real-world networks regards the identification of their more external (border) and internal nodes. The present work proposes a formal and objective definition of these properties, founded on the recently introduced concept of node diversity. It is shown that this feature does not exhibit any relevant correlation with several well-established complex networks measurements. A methodology for the identification of the borders of complex networks is described and illustrated with respect to theoretical (geographical and knitted networks) as well as real-world networks (urban and word association networks), yielding interesting results and insights in both cases.

  7. Survivable virtual optical network embedding with probabilistic network-element failures in elastic optical networks

    NASA Astrophysics Data System (ADS)

    Yang, Hui; Cheng, Lei; Luo, Guangjun; Zhang, Jie; Zhao, Yongli; Ding, Huixia; Zhou, Jing; Wang, Yang

    2015-06-01

    The elastic optical networks can elastically allocate spectrum tailored for various bandwidth requirements. In addition, different virtual optical networks (VONs) formed by different applications or service providers need to be embedded on the common physical optical network, it brings virtual optical network embedding (VONE) problem. There is no precise standard to measure the survivability of VON from the failure probability view and take minimum VON failure probability as an objective in a VONE problem. In this paper, we investigate a survivable VONE problem from a new perspective. Considering probabilistic physical network-element failures, a novel metric, named virtual optical network failure probability (VON-FP), is introduced to evaluate the survivability of VONs in elastic optical networks. Moreover, a failure-probability-aware virtual optical network embedding (FPA-VONE) algorithm is proposed to deploy VONs on the physical network elements with small failure probability, and finally to decrease the VON-FP and enhance the spectrum utilization effectively.

  8. LINCS: Livermore's network architecture. [Octopus computing network

    SciTech Connect

    Fletcher, J.G.

    1982-01-01

    Octopus, a local computing network that has been evolving at the Lawrence Livermore National Laboratory for over fifteen years, is currently undergoing a major revision. The primary purpose of the revision is to consolidate and redefine the variety of conventions and formats, which have grown up over the years, into a single standard family of protocols, the Livermore Interactive Network Communication Standard (LINCS). This standard treats the entire network as a single distributed operating system such that access to a computing resource is obtained in a single way, whether that resource is local (on the same computer as the accessing process) or remote (on another computer). LINCS encompasses not only communication but also such issues as the relationship of customer to server processes and the structure, naming, and protection of resources. The discussion includes: an overview of the Livermore user community and computing hardware, the functions and structure of each of the seven layers of LINCS protocol, the reasons why we have designed our own protocols and why we are dissatisfied by the directions that current protocol standards are taking.

  9. CARRIER VOICE NETWORK MANAGEMENTCARRIER VOICE NETWORK MANAGEMENT Elvis N. Ngah

    E-print Network

    Bhulai, Sandjai

    CARRIER VOICE NETWORK MANAGEMENTCARRIER VOICE NETWORK MANAGEMENT Elvis N. Ngah Supervised by: Dr at the University of Brescia (Italy), Tomson Ngassa, for his documentation feedback. Elvis Ndomon Ngah Zurich, April

  10. Network Adaptive Deadband: NCS data flow control for shared networks.

    PubMed

    Díaz-Cacho, Miguel; Delgado, Emma; Prieto, José A G; López, Joaquín

    2012-01-01

    This paper proposes a new middleware solution called Network Adaptive Deadband (NAD) for long time operation of Networked Control Systems (NCS) through the Internet or any shared network based on IP technology. The proposed middleware takes into account the network status and the NCS status, to improve the global system performance and to share more effectively the network by several NCS and sensor/actuator data flows. Relationship between network status and NCS status is solved with a TCP-friendly transport flow control protocol and the deadband concept, relating deadband value and transmission throughput. This creates a deadband-based flow control solution. Simulation and experiments in shared networks show that the implemented network adaptive deadband has better performance than an optimal constant deadband solution in the same circumstances. PMID:23208556

  11. Mobile infostation network technology

    NASA Astrophysics Data System (ADS)

    Rajappan, Gowri; Acharya, Joydeep; Liu, Hongbo; Mandayam, Narayan; Seskar, Ivan; Yates, Roy

    2006-05-01

    Inefficient use of network resources on the battlefield is a serious liability: if an asset communicates with the network command for data-a terrain map, for instance-it ties up the end-to-end network resources. When many such assets contend for data simultaneously, traffic is limited by the slowest link along the path from the network command to the asset. A better approach is for a local server, known as an infostation, to download data on an anticipated-need basis when the network load is low. The infostation can then dump data when needed to the assets over a high-speed wireless connection. The infostation serves the local assets over an OFDM-based wireless data link that has MIMO enhancements for high data rate and robustness. We aim for data rate in excess of 100 Mbps, spectral efficiency in excess of 5 bits/sec/Hz, and robustness to poor channel conditions and jammers. We propose an adaptive physical layer that determines power levels, modulation schemes, and the MIMO enhancements to use based on the channel state and the level of interference in the system. We also incorporate the idea of superuser: a user who is allowed preferential use of the high data rate link. We propose a MAC that allows for this priority-based bandwidth allocation scheme. The proposed infostation MAC is integrated tightly with the physical layer through a cross-layer design. We call the proposed infostation PHY, MAC, and network technology, collectively, as the Mobile Infostation Network Technology (MINT).

  12. Model of Multimodal Composite Transportation Network

    Microsoft Academic Search

    Xiaohua Yu; Kefei Yan

    2010-01-01

    This paper analyzed the logic structure of composite transportation system which was composed of car network, bus network and urban rail network, and represented the logical relation between each modal-sub-network by building 3D model. By analyzing the constituent structure of composite network, choosing attributes and analyzing travel impedances, the composite traffic system network was established, and the traffic assignment law

  13. The network simulator of tomorrow - JNS

    Microsoft Academic Search

    Leckraj Nagowah; M. Hashmi Domun; M. Umar Ibn Waliyullah

    2010-01-01

    Networking is an important concept in the field of computing in the contemporary world. While networking equipment are readily available on the market, people in need of computer networks however often turn to other trained and qualified networking personnel to set up their required local area network. The fact that a network can physically and logically be represented and configured

  14. Geometric Interpretation of Gene Coexpression Network Analysis

    Microsoft Academic Search

    Steve Horvath; Jun Dong

    2008-01-01

    The merging of network theory and microarray data analysis techniques has spawned a new field: gene coexpression network analysis. While network methods are increasingly used in biology, the network vocabulary of computational biologists tends to be far more limited than that of, say, social network theorists. Here we review and propose several potentially useful network concepts. We take advantage of

  15. A survey on bio-inspired networking

    Microsoft Academic Search

    Falko Dressler; Özgür B. Akan

    2010-01-01

    The developments in the communication and networking technologies have yielded many existing and en- visioned information network architectures such as cognitive radio networks, sensor and actor networks, quantum communication networks, terrestrial next generation Internet, and InterPlaNetary Internet. How- ever, there exist many common signicant challenges to be addressed for the practical realization of these current and envisioned networking paradigms such

  16. OFC'09 Summary ---Core Networks Part II

    E-print Network

    California at Davis, University of

    Sessions on Core Networks NTuA: Converged Ethernet Networks NTuB: GMPLS and Network Control NThA: Ethernet Sessions on Core Networks NTuA: Converged Ethernet Networks NTuB: GMPLS and Network Control NThA: Ethernet Ntwks Tandem Interferometer H. Matsumoto and A. Hirai/ U. Tokyo, National Inst. of Adv Industrial Sci

  17. Current approaches to gene regulatory network modelling

    Microsoft Academic Search

    Thomas Schlitt; Alvis Brazma

    2007-01-01

    Many different approaches have been developed to model and simulate gene regulatory networks. We proposed the following categories for gene regulatory network models: network parts lists, network topology models, network control logic models, and dynamic models. Here we will describe some examples for each of these categories. We will study the topology of gene regulatory networks in yeast in more

  18. Algebraic Network Coding Approach to Deterministic Wireless Relay Networks

    Microsoft Academic Search

    MinJi Kim; Muriel Medard

    2010-01-01

    The deterministic wireless relay network model, introduced by Avestimehr et\\u000aal., has been proposed for approximating Gaussian relay networks. This model,\\u000aknown as the ADT network model, takes into account the broadcast nature of\\u000awireless medium and interference. Avestimehr et al. showed that the Min-cut\\u000aMax-flow theorem holds in the ADT network.\\u000a In this paper, we show that the ADT

  19. Bayesian Network Analysis of Signaling Networks: A Primer

    NSDL National Science Digital Library

    Dana Pe'er (Harvard Medical School; Department of Genetics REV)

    2005-04-26

    High-throughput proteomic data can be used to reveal the connectivity of signaling networks and the influences between signaling molecules. We present a primer on the use of Bayesian networks for this task. Bayesian networks have been successfully used to derive causal influences among biological signaling molecules (for example, in the analysis of intracellular multicolor flow cytometry). We discuss ways to automatically derive a Bayesian network model from proteomic data and to interpret the resulting model.

  20. Antisocial Networks: Turning a Social Network into a Botnet

    Microsoft Academic Search

    Elias Athanasopoulos; A. Makridakis; Spyros Antonatos; D. Antoniades; Sotiris Ioannidis; Kostas G. Anagnostakis; Evangelos P. Markatos

    2008-01-01

    Antisocial Networks are distributed systems based on social networking Web sites that can be exploited by attackers, and directed to carry out network attacks. Malicious users are able to take control of the visitors of social sites by remotely manipulating their browsers through legitimate Web control functionality such as image-loading HTML tags, JavaScript instructions, etc. In this paper we experimentally