These are representative sample records from Science.gov related to your search topic.
For comprehensive and current results, perform a real-time search at Science.gov.
1

Channel simulation to facilitate mobile-satellite communications research  

NASA Technical Reports Server (NTRS)

The mobile-satellite-service channel simulator, which is a facility for an end-to-end hardware simulation of mobile satellite communications links is discussed. Propagation effects, Doppler, interference, band limiting, satellite nonlinearity, and thermal noise have been incorporated into the simulator. The propagation environment in which the simulator needs to operate and the architecture of the simulator are described. The simulator is composed of: a mobile/fixed transmitter, interference transmitters, a propagation path simulator, a spacecraft, and a fixed/mobile receiver. Data from application experiments conducted with the channel simulator are presented; the noise converison technique to evaluate interference effects, the error floor phenomenon of digital multipath fading links, and the fade margin associated with a noncoherent receiver are examined. Diagrams of the simulator are provided.

Davarian, Faramaz

1987-01-01

2

University of Plymouth,University of Plymouth, SoCCESoCCE, Mobile Communications Research Group, Mobile Communications Research Group Dr Mosa Ali AbuDr Mosa Ali Abu--RgheffRgheff --ENFERENFER JulienJulien INC2004INC2004  

E-print Network

Julien INC2004INC2004 Seamless Communications for Mobile Emergency ServicesSeamless Communications for Mobile Emergency Services Seamless Communications for MobileSeamless Communications for Mobile Emergency ServicesEmergency2004 Seamless Communications for Mobile Emergency ServicesSeamless Communications for Mobile Emergency

Abu-Rgheff, Mosa Ali

3

Application of Mobile Router to Military Communications.  

National Technical Information Service (NTIS)

Cisco Systems and NASA Glenn Research Center under a NASA Space Act Agreement have been performing joint networking research to apply Internet technologies and protocols to space-based communications. During this time, Cisco Systems developed the mobile-r...

D. H. Stewart, W. D. Ivancic, T. L. Bell, B. A. Kachmar, D. Shell, K. Leung

2002-01-01

4

Research on Mobile English Assistant Learning System based on Wireless Communication  

Microsoft Academic Search

In order to improve learning flexibility and efficiency, and break the constraints of time and space, an English mobile learning system based on Bluetooth as proposed and realized in the paper. English mobile learning system used Bluetooth technology as the wireless communication media. To accommodate with the characteristic of portable devices, the system is designed for low power consumption and

Guoliang Zhang; Feng Xiong; Qi Luo

2007-01-01

5

Effects of Mobile Communication  

Microsoft Academic Search

Before reviewing some of the key consequences of mobile communication technology, a brief discussion of how they fit within the media effects paradigm is in order. At the risk of oversimplification, we understand the media effects paradigm as a framework for understanding how mass media content influences attitudes and behavior of audience members. To be fair, it is important to

Scott W. Campbell

6

Land mobile communications satellite  

NASA Astrophysics Data System (ADS)

The economic value and salient technical and operational characteristics of a European Land Mobile Communication Satellite (LMCS) to complement and supplement the demand for mobile services of Western European countries in the 1995 to 2005 time frames were assessed. A significant future expansion of demand for LCMS services on the part of the public is anticipated. Important augmentations of current service capabilities could be achieved by a satellite service, improving the overall system performances and/or assisting the PTT's in containing their investments in the required infrastructure. The satellite service itself could represent a profitable revenue producer.

Carnebianca, C.; Pavesi, B.; Tuozzi, A.

1986-09-01

7

MOBILITY, MEDIA, AND EVERYDAY LIFE - AN INTERDISZIPLINARY FRAMEWORK FOR COMMUNICATIONS  

Microsoft Academic Search

Communication technologies have become a natural and important part of people's everyday life. Since mobile media have the potential to accompany its user everywhere, they can be part of almost every situation. For that reason communication research should focus on the impact mobile media usage has on existing (media) situations or formulated as a research question: How do mobile media

Christine Dietmar; Georg F. Kircher; Isabel Schlote

8

Secure Mobile IP Communication  

E-print Network

of Mobile IP & IPSec - 2 - #12;Integration of Mobile IP & IPSec - 3 - Table of contents: 1 ABSTRACT 5 2 Threats 13 3.2.2 Security Issues In Mobile IP 14 3.3 Security models 14 4 IPSEC OVERVIEW 16 4.1 Where does IPSec fit in? 16 4.2 Securing the IP layer 16 4.3 Security services offered by IPSec 17 4.3.1 Spoofing

Braun, Torsten

9

Going Places: Exploring the Impact of Intra-Sectoral Mobility on Research Productivity and Communication Behaviors in Japanese Academia  

ERIC Educational Resources Information Center

This study analyzes the impact of intra-sectoral mobility of academics on research productivity and R&D information exchange dynamics in Japan. The analysis shows intra-sectoral mobility impacting positively both research productivity and information exchange dynamics, but that this effect--except for information exchange with peers based…

Horta, Hugo; Yonezawa, Akiyoshi

2013-01-01

10

Trends in mobile satellite communication  

NASA Technical Reports Server (NTRS)

Ever since the U.S. Federal Communication Commission opened the discussion on spectrum usage for personal handheld communication, the community of satellite manufacturers has been searching for an economically viable and technically feasible satellite mobile communication system. Hughes Aircraft Company and others have joined in providing proposals for such systems, ranging from low to medium to geosynchronous orbits. These proposals make it clear that the trend in mobile satellite communication is toward more sophisticated satellites with a large number of spot beams and onboard processing, providing worldwide interconnectivity. Recent Hughes studies indicate that from a cost standpoint the geosynchronous satellite (GEOS) is most economical, followed by the medium earth orbit satellite (MEOS) and then by the low earth orbit satellite (LEOS). From a system performance standpoint, this evaluation may be in reverse order, depending on how the public will react to speech delay and collision. This paper discusses the trends and various mobile satellite constellations in satellite communication under investigation. It considers the effect of orbital altitude and modulation/multiple access on the link and spacecraft design.

Johannsen, Klaus G.; Bowles, Mike W.; Milliken, Samuel; Cherrette, Alan R.; Busche, Gregory C.

1993-01-01

11

Multidimensional Human Dynamics in Mobile Phone Communications  

PubMed Central

In today's technology-assisted society, social interactions may be expressed through a variety of techno-communication channels, including online social networks, email and mobile phones (calls, text messages). Consequently, a clear grasp of human behavior through the diverse communication media is considered a key factor in understanding the formation of the today's information society. So far, all previous research on user communication behavior has focused on a sole communication activity. In this paper we move forward another step on this research path by performing a multidimensional study of human sociality as an expression of the use of mobile phones. The paper focuses on user temporal communication behavior in the interplay between the two complementary communication media, text messages and phone calls, that represent the bi-dimensional scenario of analysis. Our study provides a theoretical framework for analyzing multidimensional bursts as the most general burst category, that includes one-dimensional bursts as the simplest case, and offers empirical evidence of their nature by following the combined phone call/text message communication patterns of approximately one million people over three-month period. This quantitative approach enables the design of a generative model rooted in the three most significant features of the multidimensional burst - the number of dimensions, prevalence and interleaving degree - able to reproduce the main media usage attitude. The other findings of the paper include a novel multidimensional burst detection algorithm and an insight analysis of the human media selection process. PMID:25068479

Quadri, Christian; Zignani, Matteo; Capra, Lorenzo; Gaito, Sabrina; Rossi, Gian Paolo

2014-01-01

12

Multidimensional human dynamics in mobile phone communications.  

PubMed

In today's technology-assisted society, social interactions may be expressed through a variety of techno-communication channels, including online social networks, email and mobile phones (calls, text messages). Consequently, a clear grasp of human behavior through the diverse communication media is considered a key factor in understanding the formation of the today's information society. So far, all previous research on user communication behavior has focused on a sole communication activity. In this paper we move forward another step on this research path by performing a multidimensional study of human sociality as an expression of the use of mobile phones. The paper focuses on user temporal communication behavior in the interplay between the two complementary communication media, text messages and phone calls, that represent the bi-dimensional scenario of analysis. Our study provides a theoretical framework for analyzing multidimensional bursts as the most general burst category, that includes one-dimensional bursts as the simplest case, and offers empirical evidence of their nature by following the combined phone call/text message communication patterns of approximately one million people over three-month period. This quantitative approach enables the design of a generative model rooted in the three most significant features of the multidimensional burst - the number of dimensions, prevalence and interleaving degree - able to reproduce the main media usage attitude. The other findings of the paper include a novel multidimensional burst detection algorithm and an insight analysis of the human media selection process. PMID:25068479

Quadri, Christian; Zignani, Matteo; Capra, Lorenzo; Gaito, Sabrina; Rossi, Gian Paolo

2014-01-01

13

Research Network E-Mobility Research Network  

E-print Network

1 E-Mobility Research Network E-Mobility Research Network Technische Universität Berlin Prof. Dr.-Ing. Dietmar Göhlich Coordinator Research Network #12;2 E-Mobility Research Network E-Mobility Research Network and Environmen #12;3 E-Mobility Research Network Research Areas Energy Storage and Conversion Integration

Berlin,Technische Universität

14

Application of Mobile Router to Military Communications  

NASA Technical Reports Server (NTRS)

Cisco Systems and NASA Glenn Research Center under a NASA Space Act Agreement have been performing joint networking research to apply Internet technologies and protocols to space-based communications. During this time, Cisco Systems developed the mobile-router which NASA and Cisco jointly tested. The early field trials of this technology have been successfully completed. The mobile-router is software code that resides in a network router. A Mobile-Router allows entire networks to roam while maintaining connectivity to the Internet. This router code is pertinent to a myriad of applications for both the government and commercial sectors. This technology will be applied to the wireless battlefield. NASA and the Department of Defense will utilize this technology for near-planetary observation and sensing spacecraft. It is the enabling technology for communication via the Internet or Intranets to aircraft. Information such as weather, air traffic control, voice and video can be easily and inexpensively transmitted to the aircraft using Internet protocols. The mobile router can be incorporated into emergency vehicles particularly ambulances and life-flight aircraft to provide real-time connectivity back to the hospital and healthcare experts. Commercial applications include entertainment services, IP telephone, and Internet connectivity for cruise ships, commercial shipping, tour busses, aircraft, and eventually cars. This paper will briefly describe the mobile router operation. An upcoming wide area network field test with application to US Coast Guard communications will be described. The paper will also highlight military and government networks that will benefit from the deployment of mobile router and the associated applications.

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

2002-01-01

15

Communications Systems for Mobile Robotics  

SciTech Connect

Performance Confirmation is the activity by which the Yucca Mountain Project confirms that the engineered and natural containment barriers of this national nuclear waste repository are performing as predicted, so that an eventual decision to close the repository can be made. This activity involves systems that must be inspected and, in some cases, serviced by mobile robots. This paper discusses systems for underground mobile robot communications, including requirements, environments, options, issues, and down-select criteria. We reviewed a variety of systems, including Slotted Waveguide, Powerline Carrier, Leaky Feeder, Photonic Bandgap Fiber, Free-Space Optics, Millimeter Waves, Terahertz Systems, and RF Systems (including IEEE 802.11 a,b, and g, and Ultra-Wideband radio).

Futterman, J A; Pao, H

2003-12-08

16

Bibliometrics, Scholarly Communication, and Communication Research.  

ERIC Educational Resources Information Center

Considers the relationship of communication research to bibliometrics and scholarly communication. Discusses whether bibliometrics is a communication research method; the future of bibliometrics in communication research; bibliometrics in the context of indicator research; articles in this themed issue, seen from a communication research

Paisley, William

1989-01-01

17

A review of mobile satellite communication systems  

NASA Astrophysics Data System (ADS)

This article describes mobile satellite systems in the planning or development stage such as MSAT, AMSC and Geostar and mobile satellite communication experiments such as PRODAT. Studies on the system such as T-SAT are also reviewed. In addition, Japanese ETS-V and ETS-VI are described. The development of mobile-satellite communication systems is promoted along with those of communication and satellite technologies.

Kondo, Kimio

1990-03-01

18

Antennas for mobile satellite communications  

NASA Astrophysics Data System (ADS)

A NASA sponsored program, called the Mobile Satellite (MSAT) system, has prompted the development of several innovative antennas at L-band frequencies. In the space segment of the MSAT system, an efficient, light weight, circularly polarized microstrip array that uses linearly polarized elements was developed as a multiple beam reflector feed system. In the ground segment, a low-cost, low-profile, and very efficient microstrip Yagi array was developed as a medium-gain mechanically steered vehicle antenna. Circularly shaped microstrip patches excited at higher-order modes were also developed as low-gain vehicle antennas. A more recent effort called for the development of a 20/30 GHz mobile terminal antenna for future-generation mobile satellite communications. To combat the high insertion loss encountered at 20/30 GHz, series-fed Monolithic Microwave Integrated Circuit (MMIC) microstrip array antennas are currently being developed. These MMIC arrays may lead to the development of several small but high-gain Ka-band antennas for the Personal Access Satellite Service planned for the 2000s.

Huang, John

1991-12-01

19

Antennas for mobile satellite communications  

NASA Technical Reports Server (NTRS)

A NASA sponsored program, called the Mobile Satellite (MSAT) system, has prompted the development of several innovative antennas at L-band frequencies. In the space segment of the MSAT system, an efficient, light weight, circularly polarized microstrip array that uses linearly polarized elements was developed as a multiple beam reflector feed system. In the ground segment, a low-cost, low-profile, and very efficient microstrip Yagi array was developed as a medium-gain mechanically steered vehicle antenna. Circularly shaped microstrip patches excited at higher-order modes were also developed as low-gain vehicle antennas. A more recent effort called for the development of a 20/30 GHz mobile terminal antenna for future-generation mobile satellite communications. To combat the high insertion loss encountered at 20/30 GHz, series-fed Monolithic Microwave Integrated Circuit (MMIC) microstrip array antennas are currently being developed. These MMIC arrays may lead to the development of several small but high-gain Ka-band antennas for the Personal Access Satellite Service planned for the 2000s.

Huang, John

1991-01-01

20

Satellite communication and navigation for mobile users  

NASA Technical Reports Server (NTRS)

Efforts made to utilize space technology for solving communication and navigation problems faced by mobile users in earth orientated situations are outlined. Applications include transoceanic airline communications, reliable long range ship-shore communications, emergency communications in regions with rough terrain, and military operations.

Bernstein, S. L.

1972-01-01

21

Effectively Communicating Qualitative Research  

ERIC Educational Resources Information Center

This article is a guide for counseling researchers wishing to communicate the methods and results of their qualitative research to varied audiences. The authors posit that the first step in effectively communicating qualitative research is the development of strong qualitative research skills. To this end, the authors review a process model for…

Ponterotto, Joseph G.; Grieger, Ingrid

2007-01-01

22

Mobile Communications Device Allowances Frequently Asked Questions  

E-print Network

Mobile Communications Device Allowances Frequently Asked Questions Q: Why is NC State University-saving measure and to provide more flexibility for employees who must carry a mobile communications device education, state agencies, federal agencies, etc., as well as private corporations. Q: Why is my MCD

23

Experiment In Aeronautical-Mobile/Satellite Communication  

NASA Technical Reports Server (NTRS)

Report describes study of performance of digital mobile/satellite communication terminals of advanced design intended for use in ground stations and airplanes in aeronautical-mobile service. Study was collaboration of NASA, Federal Aviation Administration (FAA), Communications Satellite Corp. (COMSAT), and International Maritime Satellite System (INMARSAT).

Jedrey, Thomas C.; Lay, Norman E.; Dessouky, Khaled

1992-01-01

24

Reinventing Mobile Community Computing and Communication  

E-print Network

Networking Apps (SNAPPs) In our vision, mobile devices should become effective human assistants, reactingReinventing Mobile Community Computing and Communication (Position Paper) Yann Busnel, Nuno Cruz, smartphones and mobile applications spread like wildfire and dramatically improved aspects of our professional

Paris-Sud XI, Université de

25

Effective Protocols for Mobile Communications and Networking  

SciTech Connect

This report examines methods of mobile communications with an emphasis on mobile computing and wireless communications. Many of the advances in communications involve the use of Internet Protocol (IP), Asynchronous Transfer Mode (ATM), and ad hoc network protocols. However, many of the advances in these protocols have been focused on wired communications. Recently much focus has been directed at advancing communication technology in the area of mobile wireless networks. This report discusses various protocols used in mobile communications and proposes a number of extensions to existing protocols. A detailed discussion is also included on desirable protocol characteristics and evaluation criteria. In addition, the report includes a discussion on several network simulation tools that maybe used to evaluate network protocols.

Espinoza, J.; Sholander, P.; Van Leeuwen, B,

1998-12-01

26

Mobile Perspectives: On Websites. Mobile Matters--Communication Trumps Technology  

ERIC Educational Resources Information Center

Mobile technology is a favorite discussion topic among senior IT leaders and higher education administrators. Mobile is the future for content delivery. Colleges and universities need to establish a strategy now and make the decisions necessary to take advantage of this communication opportunity. In this article, the author recommends making…

Evans, Susan T.

2011-01-01

27

Secure Mobile and Wireless Communication Services for Collaborative Virtual Gaming  

Microsoft Academic Search

The paper reports on the current research activities and innovations provisioning secure ICT services. The identified research challenges and roadmap represent a significant step towards the development of global federated security services for the Web, Grid and particularly for future Mobile and Wireless communication (ICT platforms). The overall aim of the research is to provide seamless traversal to access distributed

Babak Akhgar; W. Orth; N. Meyer; M. Tuisku; G. Pipan; M. L. Gallego; J. A. Garcia; M. Cecchi; J.-N. Colin

2006-01-01

28

Mobile Phones as Fashion Statements: The Co-creation of Mobile Communication’s Public Meaning  

Microsoft Academic Search

This chapter explores public mobile communication technology as frontstage and back-stage phenomena. We explore the design aesthetics of the mobile phone from the standpoint of its commercial origins and public re-interpretation, emphasizing fashion and identity in the co-creation and consumption of mobile communication technology. The mobile phone in this context is analyzed as both a physical icon and an item

James E. Katz; Satomi Sugiyama

29

Mobile Communication Security Controllers An Evaluation Paper  

E-print Network

mobile handset is a ubiquitous part of modern life and as device technology and network performance investigates the suggestion. 1This has also extended into some regions using variants of CDMA standards where the RUIM is specified. V 1.01 1 #12;1 Introduction Mobile communication and computing technology have

Mayes, Keith

30

Presence and Embodiment in Mobile Phone Communication  

Microsoft Academic Search

This paper explores the temporal and spatial characteristics of mobile phone communication, comparing the experience of presence in phone calls and in virtual reality environments. It is argued that in phone communication interactional affordances create an experience of presence and a degree of embodiment. The theoretical framework adopted combines Goffman's frame analysis with Gibson's affordance theory and a situated cognition

Ruth M. Rettie

2005-01-01

31

USDA Forest Service mobile satellite communications applications  

NASA Technical Reports Server (NTRS)

The airborne IR signal processing system being developed will require the use of mobile satellite communications to achieve its full capability and improvement in delivery timeliness of processed IR data to the Fire Staff. There are numerous other beneficial uses, both during wildland fire management operations or in daily routine tasks, which will also benefit from the availability of reliable communications from remote areas.

Warren, John R.

1990-01-01

32

Design of Hybrid Mobile Communication Networks for Planetary Exploration  

NASA Technical Reports Server (NTRS)

The Mobile Exploration System Project (MEX) at NASA Ames Research Center has been conducting studies into hybrid communication networks for future planetary missions. These networks consist of space-based communication assets connected to ground-based Internets and planetary surface-based mobile wireless networks. These hybrid mobile networks have been deployed in rugged field locations in the American desert and the Canadian arctic for support of science and simulation activities on at least six occasions. This work has been conducted over the past five years resulting in evolving architectural complexity, improved component characteristics and better analysis and test methods. A rich set of data and techniques have resulted from the development and field testing of the communication network during field expeditions such as the Haughton Mars Project and NASA Mobile Agents Project.

Alena, Richard L.; Ossenfort, John; Lee, Charles; Walker, Edward; Stone, Thom

2004-01-01

33

Communicating Research to Public Audiences  

NSF Publications Database

... Research to Public Audiences Synopsis of Program: Communicating Research to Public Audiences is a ... is to disseminate research results, research in progress, or research methods. Cognizant Program ...

34

Mobile satellite communications in the Forest Service  

NASA Technical Reports Server (NTRS)

There are usually some places within a forest that do not have adequate communication coverage due to line-of-sight or other reasons. These areas are generally known by the foresters and radio technicians and allowances are made for that when working or traveling in those areas. However, when wildfire or other emergencies occur, communications are vital because wildfires can require hundreds of firefighters and cover thousands of acres. During these emergency operations, the existing communications are not adequate and complete radio systems are moved into the area for the conduct of fire communications. Incident command posts (ICPs) and fire camps are set up in remote locations and there is constant need for communications in the fire area and to agency headquarters and dispatch offices. Mobile satellite communications would be an ideal supplement to the Forest Service's current communications system in aiding forest fire control activities.

Warren, John R.

1988-01-01

35

Mobile satellite communications in the Forest Service  

NASA Astrophysics Data System (ADS)

There are usually some places within a forest that do not have adequate communication coverage due to line-of-sight or other reasons. These areas are generally known by the foresters and radio technicians and allowances are made for that when working or traveling in those areas. However, when wildfire or other emergencies occur, communications are vital because wildfires can require hundreds of firefighters and cover thousands of acres. During these emergency operations, the existing communications are not adequate and complete radio systems are moved into the area for the conduct of fire communications. Incident command posts (ICPs) and fire camps are set up in remote locations and there is constant need for communications in the fire area and to agency headquarters and dispatch offices. Mobile satellite communications would be an ideal supplement to the Forest Service's current communications system in aiding forest fire control activities.

Warren, John R.

1988-05-01

36

A Mobile Multimedia Communication Framework for IP based Convergence Networks  

Microsoft Academic Search

We propose an efficient mobile multimedia communication protocol, mobile terminal software platform and mobile VoIP application for IP-based convergence networks. The proposed mobile multimedia communication protocol is called as ST-MRSVP (split tunnel based mobile resource reservation protocol) which integrates split tunnel based mobile IP and RSVP. Since mobile multimedia terminal platform should support seamless QoS level, mobile QoS modules for

Won-Tae Kim

2006-01-01

37

Microstrip monopulse antenna for land mobile communications  

NASA Technical Reports Server (NTRS)

Low cost is one of the main requirements in a communication system suitable for mass production, as it is the case for satellite land mobile communications. Microstrip technology fulfills this requirement which must be supported by a low cost tracking system design. The tradeoff led us to a prototype antenna composed of microstrip patches based on electromechanical closed-loop principle; the design and the results obtained are described.

Garcia, Q.; Martin, C.; Delvalle, J. C.; Jongejans, A.; Rinous, P.; Travers, M. N.

1993-01-01

38

Increasing clinical presence of mobile communication technology: avoiding the pitfalls.  

PubMed

Mobile communication technologies are employed in many diverse areas of healthcare delivery to provide improved quality and efficiency of communication and facilitate increased rapidity of data or information transfer. Mobile phones enable healthcare professionals to possess a portable platform from which to provide many healthcare-related applications and are a popular means to directly communicate with colleagues and patients. As involvement of mobile communication technology in healthcare delivery continues to rapidly expand, there are also important considerations of relevance to patient safety and security as a result. Here, we review the previous evidence of reported clinical risks associated with mobile communication technology, such as electromagnetic interference, confidentiality and data security, distraction/noise, infection control, and cross contamination. In conclusion, although mobile phones provide much putative potential improvement to healthcare delivery, further evaluation and research are required to both inform and protect health professionals and users of such technology in the healthcare environment and provide the evidence base to support the provision of clear and comprehensive guidelines. PMID:21780941

Visvanathan, Akila; Gibb, Alan P; Brady, Richard R W

2011-10-01

39

1. Final Title SECURITY of MOBILE COMMUNICATIONS  

E-print Network

limitations; c) the user requirements; d) the contents of provided services; and e) the evolution of hacking of security attacks and hacking techniques; 3) discussing security policies and security practices to help for hacking systems via mobile communications. Threats and risk analysis are discussed in this part, along

40

The evolution of global mobile communications  

NASA Astrophysics Data System (ADS)

A long term, global viewpoint is presented on the subject of communications access which may be the key to resolving many of the world's current requirements for developing a truly global, ubiquitous mobile/personal voice and data communications capability. The solutions are multi disciplinary, some using terrestrial techniques, some by satellite, but both using a variety of technologies and techniques. In the area of satellite communications, the focus is on inexpensive, efficient antennas, high gain spacecraft amplifiers and efficient power and bandwidth modulation techniques including high performance, low bit rate voice codecs. Terrestrially, many of the same technologies apply to cellular telephone systems. A key issue is the electromagnetic spectrum and its utilization efficiency, especially if the popularity of cellular telephones is repeated in the development of mobile satellite systems. Integration of diverse systems depends on formulating a framework that will allow systems to be interoperable by specifying logical interfaces among most or all evolving niche systems.

Spolsky, A. I.; Brasic, J. R.

41

Value in technology evolution: case mobile peer-to-peer communications  

Microsoft Academic Search

Purpose – Mobile peer-to-peer communications is an essential phase in the evolution of mobile communications technologies, motivating this research which aims to focus on how established industry stakeholders and new entrants can adapt themselves to the new situation. Design\\/methodology\\/approach – Based on existing literature, the authors identified three distinctive evolution paths for mobile peer-to-peer communications and developed an analysis framework

Mikko V. J. Heikkinen; Sakari Luukkainen

2010-01-01

42

Connection Protocol For Mobile/Satellite Communications  

NASA Technical Reports Server (NTRS)

Throughput increased by better resolution of competing simultaneous requests for connections. Improved protocol sorts out simultaneous competing requests by message-originating stations for connection to satellite transmission link of land-mobile/satellite digital communication system. Applies to multiple-channel packet-message system with synchronous timeslots on all channels. Communication system has Q channels. Transmissions of packets allowed to begin only at beginnings of timeslots. Provides, to all users, binary feedback information on state of channel - namely, whether or not there is collision - during each timeslot.

Tan, Harry H.; Yan, Tsun-Yee

1990-01-01

43

Distributed Extremum Seeking and Cooperative Control for Mobile Communication  

E-print Network

Distributed Extremum Seeking and Cooperative Control for Mobile Communication Chaoyong Li, Zhihua of mobile cooperative communication clusters is considered. Each communication channel is modeled by its than a certain threshold. The objective of the communication network is to not only maintain

Ingram, Mary Ann

44

Acoustic energy conversion for mobile nanosensor network communication  

Microsoft Academic Search

Communication is fundamental capability of nanosesnor in medical and nanomedicine application. Communication by acoustic wave is most useful in nanosesnor mobile network. Acoustic communication between nanosensors in the mobile network has been favorable potential utilization in nanonmedicine, especially in health care, drug delivery and information processing. In this paper, we present the acoustic energy conversion between nanosensor communications that can

Mohammadjavad Abbasi Abandankeshi; Muhammad Shafie Abd Latiff

2011-01-01

45

A Secure Protocol for Traffic Police Mobile Communication System  

Microsoft Academic Search

The advance of wireless networking, communication, and mobile technology is making a big impact to daily life. Mobile devices, such as cell phones, and PDAs are becoming more popular each day. The large number of mobile users along with the ubiquitous nature of mobile devices has created a huge market for mobile applications and is caused a strong demand on

Habibollah Arasteh Rad; Khairulmizam Samsudin; A. R. B. Ramli; M. B. Tehrani; M. A. Tavalai

2009-01-01

46

Advanced mobile satellite communications using COMETS satellite in MM-wave and Ka-band  

NASA Technical Reports Server (NTRS)

Early in the 21st century, the demand for personal communications using mobile, hand-held, and VSAT terminals will rapidly increase. In a future system, many different types of services should be provided with one-hop connection. The Communications Research Laboratory (CRL) has studied a future advanced mobile satellite communications system using millimeter wave and Ka band. In 1990, CRL started the Communications and Broadcasting Engineering Test Satellite (COMETS) project. The satellite has been developed in conjunction with NASDA and will be launched in 1997. This paper describes the COMETS payload configuration and the experimental system for the advanced mobile communications mission.

Ohmori, Shingo; Isobe, Shunkichi; Takeuchi, Makoto; Naito, Hideyuki

1993-01-01

47

Design of a mobile coastal communications buoy  

E-print Network

In response to a growing interest in networked communications at sea as well as the needs of our vital commercial fishing industry, the Northeast Consortium funded a novel research initiative to establish wireless acoustic ...

Hendry-Brogan, Meghan

2004-01-01

48

Mobile Robotics: Research, Applications and Challenges  

E-print Network

Mobile Robotics: Research, Applications and Challenges Ulrich Nehmzow Department of Computer Abstract This overview paper discusses some of the major focuses of current mobile robotics research, introduces a specific application of mobile robotics -- au- tomated inspection using autonomous novelty

Nehmzow, Ulrich

49

Hybrid Mobile Communication Networks for Planetary Exploration  

NASA Technical Reports Server (NTRS)

A paper discusses the continuing work of the Mobile Exploration System Project, which has been performing studies toward the design of hybrid communication networks for future exploratory missions to remote planets. A typical network could include stationary radio transceivers on a remote planet, mobile radio transceivers carried by humans and robots on the planet, terrestrial units connected via the Internet to an interplanetary communication system, and radio relay transceivers aboard spacecraft in orbit about the planet. Prior studies have included tests on prototypes of these networks deployed in Arctic and desert regions chosen to approximate environmental conditions on Mars. Starting from the findings of the prior studies, the paper discusses methods of analysis, design, and testing of the hybrid communication networks. It identifies key radio-frequency (RF) and network engineering issues. Notable among these issues is the study of wireless LAN throughput loss due to repeater use, RF signal strength, and network latency variations. Another major issue is that of using RF-link analysis to ensure adequate link margin in the face of statistical variations in signal strengths.

Alena, Richard; Lee, Charles; Walker, Edward; Osenfort, John; Stone, Thom

2007-01-01

50

Biometric Communication Research for Television.  

ERIC Educational Resources Information Center

Biometric communication research is defined as research dealing with the information impact of a film or television show, photographic picture, painting, exhibition, display, or any literary or functional texts or verbal stimuli on human beings, both as individuals and in groups (mass audiences). Biometric communication research consists of a…

Malik, M. F.

51

A mobility-aware dynamic database caching scheme for wireless mobile computing and communications  

Microsoft Academic Search

This paper describes a mobility-aware dynamic database caching scheme for wireless mobile computing and communications. A mobile-floating agent scheme is proposed, in which:caching techniques are cognizant of the mobile nature of mobile users and the location-sensitive nature of mobile systems. The mobile-floating agent maintains a second class cache in the fixed network and employs Barbara's ''invalidation reports broadcasting'' cache consistency

George Y. Liu

1996-01-01

52

Personal Mobility in the ICEBERG Integrated Communication Network  

E-print Network

Personal Mobility in the ICEBERG Integrated Communication Network Bhaskaran Raman bhaskar communication services in a personalized, unified, and clean fashion across these devices. The Iceberg Project as defined by Iceberg are much richer than the corresponding concepts in traditional telephony

Raman, Bhaskaran

53

MobileMiner: A Real World Case Study of Data Mining in Mobile Communication  

E-print Network

MobileMiner: A Real World Case Study of Data Mining in Mobile Communication Tengjiao Wang , Bishan Confidence Software Technologies (Peking University), Ministry of Education, China School of Electronics@cs.sfu.ca ABSTRACT Mobile communication data analysis has been often used as a background application to motivate

Pei, Jian

54

Aeronautical Mobile Airport Communications System (AeroMACS)  

NASA Technical Reports Server (NTRS)

To help increase the capacity and efficiency of the nation s airports, a secure wideband wireless communications system is proposed for use on the airport surface. This paper provides an overview of the research and development process for the Aeronautical Mobile Airport Communications System (AeroMACS). AeroMACS is based on a specific commercial profile of the Institute of Electrical and Electronics Engineers (IEEE) 802.16 standard known as Wireless Worldwide Interoperability for Microwave Access or WiMAX (WiMax Forum). The paper includes background on the need for global interoperability in air/ground data communications, describes potential AeroMACS applications, addresses allocated frequency spectrum constraints, summarizes the international standardization process, and provides findings and recommendations from the world s first AeroMACS prototype implemented in Cleveland, Ohio, USA.

Budinger, James M.; Hall, Edward

2011-01-01

55

The Impact of Avatar Mobility on Distributed Server Assignment for Delivering Mobile Immersive Communication Environment  

Microsoft Academic Search

In our previous work, we proposed a distributed server architecture to deliver multi-party immersive voice communication service to mobile clients (e.g. Sony PSP) accessing a distributed virtual environment (DVE). We refer to such immersive voice communication service as mobile immersive communication environment (MICE). We also proposed solutions to assign server to create the auditory scene for each avatar. In this

Ying Peng Que; Farzad Safaei; Paul Boustead

2007-01-01

56

Land vehicle antennas for satellite mobile communications  

NASA Technical Reports Server (NTRS)

Antenna designs applicable to future satellite mobile vehicle communications are examined. Microstrip disk, quadrifilar helix, cylindrical microstrip, and inverted V and U crossed-dipole low gain antennas (3-5 dBic) that provide omnidirectional coverage are described. Diagrams of medium gain antenna (9-12 dBic) concepts are presented; the antennas are classified into three types: (1) electronically steered with digital phase shifters; (2) electronically switched with switchable power divider/combiner; and (3) mechanically steered with motor. The operating characteristics of a conformal antenna with electronic beam steering and a nonconformal design with mechanical steering are evaluated with respect to isolation levels in a multiple satellite system. Vehicle antenna pointing systems and antenna system costs are investigated.

Haddad, H. A.; Paschen, D.; Pieper, B. V.

1985-01-01

57

Lightweight Client-Pull Protocol for Mobile Communication  

Microsoft Academic Search

Consumer mobile devices, such as cellular phones and PDAs, rely on TCP\\/IP as main communication pro- tocol. However, cellular networks are not reliable as wired and wireless LAN, due to both users mobility and geographical obstacles. Moreover, limited bandwidth outside urban areas requires an application level data priority management, in order to improve user experience and avoid communication stack deadlocks.

Stefano Sanna; Emanuela De Vita; Andrea Piras; Christian Melchiorre

2005-01-01

58

Key Technologies for IMT-Advanced Mobile Communication Systems  

E-print Network

Key Technologies for IMT-Advanced Mobile Communication Systems Carl WIJTING1 , Klaus DOPPLER1 and assessment of key technologies for IMT-Advanced mobile communication systems. WINNER has devised an OFDMA- Advanced technology proposals has been issued by the International Telecommunication Union (ITU) [2

59

Interference Analysis for an Aeronautical Mobile Airport Communications System  

NASA Technical Reports Server (NTRS)

The next generation of aeronautical communications for airport surface applications has been identified through a NASA research program and an international collaborative future communications study. The result, endorsed by both the United States and European regulatory agencies is called AeroMACS (Aeronautical Mobile Airport Communications System) and is based upon the IEEE 802.16e mobile wireless standard. Coordinated efforts to develop appropriate aviation standards for the AeroMACS system are now underway within RTCA (United States) and Eurocae (Europe). AeroMACS will be implemented in a recently allocated frequency band, 5091- 5150 MHz. As this band is also occupied by fixed satellite service uplinks, AeroMACS must be designed to avoid interference with this incumbent service. The aspects of AeroMACS operation that present potential interference to the fixed satellite service are under analysis in order to enable the definition of standards that assure that such interference will be avoided. The NASA Glenn Research Center has been involved in this analysis, and the first results of modeling and simulation efforts directed at this analysis are the subject of this paper.12

Wilson, Jeffrey D.; Kercewski, Robert J.

2010-01-01

60

Interference Analysis for an Aeronautical Mobile Airport Communications System  

NASA Technical Reports Server (NTRS)

The next generation of aeronautical communications for airport surface applications has been identified through a NASA research program and an international collaborative future communications study. The result, endorsed by both the United States and European regulatory agencies is called AeroMACS (Aeronautical Mobile Airport Communications System) and is based upon the IEEE 802.16e mobile wireless standard. Coordinated efforts to develop appropriate aviation standards for the AeroMACS system are now underway within RTCA (United States) and Eurocae (Europe). AeroMACS will be implemented in a recently allocated frequency band, 5091-5150 MHz. As this band is also occupied by fixed satellite service uplinks, AeroMACS must be designed to avoid interference with this incumbent service. The aspects of AeroMACS operation that present potential interference to the fixed satellite service are under analysis in order to enable the definition of standards that assure that such interference will be avoided. The NASA Glenn Research Center has been involved in this analysis, and the first results of modeling and simulation efforts directed at this analysis are the subject of this presentation.

Wilson, Jeffrey D.; Kerczewski, Robert J.

2011-01-01

61

SIMKEYS: an efficient approach in text entry for mobile communications  

Microsoft Academic Search

As text messaging services are becoming increasingly popular in today's global wireless market, fundamental design issues still linger with respect to text entry methods on mobile devices. Current schemes are often plagued with problems, such as poor typing efficiency, stringent physical size limitations, and unwarranted cognitive processing burden, on mobile users. The proposed text entry scheme for mobile communications, called

Rick W. K. Ha; Pin-Han Ho; X. Sherman Shen

2004-01-01

62

Protocol Design for Mobile Radio Group Communications Over Satellite  

Microsoft Academic Search

A protocol design for a mobile radio service supporting half-duplex push-to-talk voice communications over mobile satellite systems is presented. The service enables a closed group of mobile radio users to communicate among themselves, so that a transmission from any user is received by all. A key issue is the efficient utilization of satellite channels. Demand-assignment multiple access (DAMA) is employed

Victor C. M. Leung

1992-01-01

63

History of Antenna Technology for Mobile Communications in Korea  

NASA Astrophysics Data System (ADS)

In this paper, we discuss the development of wireless and mobile communications in Korea, current technological trends, and the future outlook on technological developments. Since the introduction of the telegraph and the telephone in September 1885, Korea's wired and wireless communications industry has consistently developed for over 100 years. Since 1984, upon the provision of the mobile telecommunications service, the industry has seen drastic qualitative and quantitative growth in terms of both technical and economic aspects, which played a crucial role in the rapid growth of the digital industry in Korea. After the era of the analog cellular service based on the Advanced Mobile Phone System (AMPS), a precursor to the modern mobile service, Korea became the world's first country to commercialize Code Division Multiple Access (CDMA) in 1996 and succeeded in commercializing CDMA 2000 lx (IMT 2000) in 2001. With further developments in the mobile communication technology, the technology for antennas also saw drastic advancements. As the mobile antennas moved from the second to the third generation, they grew from external models to very small internal models. At the same time, they evolved into highly functional and high performance multiple band and wide band antennas. Furthermore, Korea was the first country to commercialize and offer the Wireless Broadband Internet (WiBro) service in 2006. By leading the wireless communications standardization and exerting remarkable efforts in research and development, Korea is consolidating its status as an Information Technology (IT) leader in the global market. The antenna's inherent importance will be further emphasized in the near future as it satisfies the performance and structural needs of portable terminals necessary for realizing the projected establishment of the ubiquitous world. It is thought that antenna technologies will not be limited to simple concepts as previously experienced but will utilize various kinds of materials that build the terminals' structure and framework. Moreover, studies will be performed with an emphasis on multiple band, multiple directivity, and ultra-wide band. Accordingly, antenna technologies to which new concepts are applied, such as SMART antenna and MIMO antenna technologies and meta-materials, will surely be effective alternatives.

Min, Kyeong-Sik; Park, Chul-Keun; Kang, Suk-Youb

64

A Review of Mobile HCI Research Methods  

Microsoft Academic Search

This paper examines and reviews research methods applied within the field of mobile human-computer interaction. The purpose is to provide a snapshot of current practice for studying mobile HCI to identify shortcomings in the way research is conducted and to propose opportunities for future ap- proaches. 102 publications on mobile human-computer interaction research were categorized in a matrix relating their

Jesper Kjeldskov; Connor Graham

2003-01-01

65

Mocotos: Mobile Communications Tools for Children with Special Needs  

E-print Network

in communication and social interaction. Children with autism typically do not acquire verbal and social skillsMocotos: Mobile Communications Tools for Children with Special Needs Abstract Children with special needs often struggle to communicate about even the most basic of concepts. For children who cannot

Hayes, Gillian R.

66

Personal Mobility in the ICEBERG Integrated Communication Network  

E-print Network

Personal Mobility in the ICEBERG Integrated Communication Network Bhaskaran Raman Randy H. Katz in the ICEBERG Integrated Communication Network Bhaskaran Raman Randy H. Katz Anthony D. Joseph fbhaskar communication services in a personalized, unified, and clean fashion across these devices. The Iceberg Project

Joseph, Anthony D.

67

Mobile Computing and Communications: An Introduction  

Microsoft Academic Search

This paper gives an overview of mobile computing and issues related to the field. The discussion starts with definitions of various terms associated with mobile computing. The diversity of mobile applications is explored to give readers an idea of what mobile computing has to offer, followed by a discussion on the limitations of wireless networks and the issues which have

Mazliza Othman; Fakulti Sains Komputer; Teknologi Maklumat

1999-01-01

68

Mobile communications satellite antenna flight experiment definition  

NASA Astrophysics Data System (ADS)

There are classes of application that collectively require a variety of different types of large-aperture space antennas. Fortunately, there are a number of different deployable antenna concepts that have tremendous potential for such applications. However, these concepts vary in maturity from flight-proven designs to extremely innovative configuration definitions. But these promising concepts lack sufficient demonstrations of maturity to be seriously considered in the large size range for immediate application. The reason for this situation is an extremely limited space flight data base in addition to the technical limitations and great costs associated with meaningful ground testing of large, flexible, precision space structures. The user community of such structures, especially the commercial organizations interested in providing a Mobile Communications Satellite (MSAT) on a profit-making basis, will require significant demonstrations of technology readiness prior to application commitment. Such demonstrations will probably be based on a combination of extensive ground testing and subsequent space flight experiments. The Communications Division of the National Aeronautics and Space Administration (NASA) Office of Space Science and Applications sponsored a study at the Jet Propulsion Laboratory (JPL) to determine the technical feasibility and cost of a Shuttle-based flight experiment specifically intended for the MSAT commercial user community. The experiment will include demonstrations of technology in the areas of radio frequency (RF), sensing and control, and structures. This paper summarizes the results of the structural subsystem study. These results include experiment objective and technical approach, experiment structural description, structure/environment interactions, structural characterization, thermal characterization, structural measurement system, and experiment functional description.

Freeland, Robert E.

69

Link search algorithms for a spread-spectrum mobile communication network with directive\\/adaptive antennas  

Microsoft Academic Search

A non-centralized fully distributed mobile communication network with directive or adaptive antennas is proposed. Every node uses directive or adaptive antennas for transmitting and receiving communication signals. The spatial and temporal synchronization of the transmitting and receiving antenna beams is accomplished by employing the Global Positioning System (GPS) information and a double-ended spatial search algorithm. This research focuses on the

Tien-Yow Liu; Robert A. Scholtz

1998-01-01

70

Inferring human mobility using communication patterns  

E-print Network

Understanding the patterns of mobility of individuals is crucial for a number of reasons, from city planning to disaster management. There are two common ways of quantifying the amount of travel between locations: by direct observations that often involve privacy issues, e.g., tracking mobile phone locations, or by estimations from models. Typically, such models build on accurate knowledge of the population size at each location. However, when this information is not readily available, their applicability is rather limited. As mobile phones are ubiquitous, our aim is to investigate if mobility patterns can be inferred from aggregated mobile phone call data. Using data released by Orange for Ivory Coast, we show that human mobility is well predicted by a simple model based on the frequency of mobile phone calls between two locations and their geographical distance. We argue that the strength of the model comes from directly incorporating the social dimension of mobility. Furthermore, as only aggregated call da...

Palchykov, Vasyl; Jo, Hang-Hyun; Saramäki, Jari; Pan, Raj Kumar

2014-01-01

71

Podscanning : audio microcontent and synchronous communication for mobile devices  

E-print Network

Over the past decade, computationally powerful audio communication devices have become commonplace. Mobile devices have high storage capacity for digital audio, and smartphones or networked PDAs can be used to stream ...

Wheeler, Patrick Sean

2010-01-01

72

EECE 569 -UBC ECE -Outline Outline-1 Mobile Communications Networks  

E-print Network

of wireless communications Cellular wireless networks 2G, 2.5G, 3G and 4G, ... cellular networks Mobility. Glisic, Advanced Wireless Networks: 4G Technologies, 2 ed. Wiley, 2009. #12;Outline-10 Course Materials

Pulfrey, David L.

73

Evaluation of Mobile Communications: From Voice Calls to Ubiquitous Multimedia Group Communications  

E-print Network

systems, namely the coexistence of heterogeneous mobile networks, and the migration to B3G systems. #12;IVIV1/1 Evaluation of Mobile Communications: From Voice Calls to Ubiquitous Multimedia Group in terms of network heterogeneity, migration to B3G, mobility over heterogeneous networks, and real

Monteiro, Edmundo

74

IEEE Communications Magazine July 2002108 Standardization of Mobile Phone  

E-print Network

-based services. For instance, the telematics system [1] currently offered by automotive manufacturers, such as GM Systems 0163-6804/02/$17.00 © 2002 IEEE ABSTRACT Finding the location of the mobile phone is one of the important features of the 3G mobile communication system. Many valuable location- based services can

Han, Richard Y.

75

Cooperation without (reliable) communication: Interfaces for mobile applications  

Microsoft Academic Search

The design of effective collaborative applications on mobile platforms has many problems. Wireless networks are fast enough that one aspires to true interactive applications, but too slow for much real-time feedback. This is exacerbated by the variability due to interference and broken connections. Mobile computing using wireless communications thus sits in a grey area between different styles of interaction. This

Alan J. Dix

1995-01-01

76

Mobile Router Testing with Diverse RF Communications Links  

NASA Technical Reports Server (NTRS)

This is a short report on demonstrations using Mobile IP and several diverse physical communications links to connect a mobile network to a fixed IPv4 internet. The first section is a description of the equipment used, followed by descriptions of the tests, the theoretical results, and finally conclusions and the actual data.

Brooks, David; Hoder, Doug; Wilkins, Ryan

2004-01-01

77

The History of LandMobile Radio Communications  

Microsoft Academic Search

This paper on land-mobile radio communications was prepared for the noncommunications and nonmobile radio specialist. The early pioneering work of the police is covered, and after a brief statement about the early use of mobile transmitters, the Connecticut State Police two-way FM system is described. From the introduction of FM into the Connecticut system to the present, engineering efforts have

Daniel Noble

1962-01-01

78

New inclined synchronous satellite system for mobile communications and radiodetermination  

Microsoft Academic Search

A new satellite system using inclined synchronous satellites is proposed. This system can provide radiodetermination services as well as communication services for mobile earth stations in the common satellite system. In this system, two or more satellites can be always observed at the same time from any mobile terminal on the earth (including the polar regions) with an elevation angle

Fumiaki Sugaya; Yutaka Yasuda; Yasuo Hirata

1988-01-01

79

RadioActive: Enabling Persistent Mobile Communications for Groups  

E-print Network

effective than text in group collaboration because of its ability to promote higher level and more social1 RadioActive: Enabling Persistent Mobile Communications for Groups Abstract Current mobile technology works well to connect individuals together at any time or place. However, general focus on one

80

Mobile ad hoc networks for oceanic aircraft communications  

E-print Network

Research into mobile ad hoc networks (MANET's) has exploded in recent years. MANET's are a type of wireless network in which independently mobile nodes are capable of self-forming and maintaining a connected network, even ...

Kingsbury, Ryan W

2009-01-01

81

Usability of a mobile, group communication prototype while rendezvousing  

Microsoft Academic Search

Mobile phones are increasingly being used collaboratively by social networks of users in spite of the fact that they are primarily designed to support single users and one-to-one communication. It is not well understood how services such as group SMS, SMS-based discussion lists and mobile instant messaging (IM) will be used by mobile groups in natural settings. Studying specific instances

Jeff Axup; Stephen Viller; Nicola J Bidwell

2005-01-01

82

IEEE COMMUNICATIONS SURVEYS & TUTORIALS, VOL. 12, NO. 1, FIRST QUARTER 2010 1 Route Optimization in Network Mobility: Solutions,  

E-print Network

Engineering Manuscript received ; revised . The research reported in this article was funded by NASA Grant NNX) handles mobility of a set of mobile nodes in an aggregate way using one or more mobile routers. NEMO needs to obtain a new IP address, and therefore, communication may become inefficient while maintaining

Atiquzzaman, Mohammed

83

Influence of new mobile tools on communication  

Microsoft Academic Search

With the advent of such new communication tools as cellular phones and the Internet, communication styles have diversified. This diversity has brought changes in community formation as well as such serious problems as network addiction and mutual distrust among users. The purpose of this study is to find clues to these problems produced by those new communication tools. Thus, we

Saori Murata; Fujio Toriumi; Kenichiro Ishii

84

Satellite Communications Applications Research  

NASA Technical Reports Server (NTRS)

This report describes work performed by SDL in the development of monolithically-integrated master oscillator power amplifiers under the NASA-SCAR research contract. The goals of the program were to demonstrate high power diffraction-limited operation from a semiconductor laser with the following characteristics: (1) Output power of 0.5 to 1.0 W continuous-wave (cw); (2) Single spectral mode with greater than 20 dB of side mode suppression; (3) Single spatial mode operation; (4) Modulation capability of 0.5 GHz; and (5) Operating wavelength between 830-860 nm. Cw diffraction-limited output powers as high as 2.2 W were achieved while maintaining a single longitudinal mode. Side mode suppression ratios greater than 20 dB are typically obtained. The single spatial mode output has a Strehl ratio estimated at 0.85, and a high-speed modulation capability was demonstrated with a small-signal 3-dB roll-off at 1.0 GHz. Finally, all of this performance was obtained in the 860 nm wavelength band, which corresponds to the peak sensitivity of Si detectors. During the first option period, three deliverables were fabricated and delivered that included 1 distributed Bragg reflector (DBR) laser operating at 970 nm, 1 DBR laser operating at 860 nm, and one monolithic flared amplifier master oscillator power amplifier (MFA-MOPA) providing 0.5 W cw diffraction-limited output. During the second option period, a total of 5 MFA-MOPA devices were delivered, each operating to better than 1 W cw diffraction-limited at 860 nm.

Lang, Robert J.

1994-01-01

85

Effect of MobileASL on Communication Among Deaf Users  

E-print Network

using the encoding software library x264 [7]. Our goal is to make ASL cell phone communication possible and the slow processor speeds on cell phones. A new real-time compression scheme is needed to transmit video to mobile use. Video cell phones would allow Deaf people to communicate in real-time using sign language

Wobbrock, Jacob O.

86

Intercepting Mobile Communications: The Insecurity of 802.11  

E-print Network

Intercepting Mobile Communications: The Insecurity of 802.11 Nikita Borisov UC Berkeley nikitab be derived from the WEP insecurities. Finally, Section 7 offers some conclusions. 2. THE WEP PROTOCOL the communicating parties to protect the body of a transmitted frame of data. Encryp­ tion of a frame proceeds

Wagner, David

87

Intercepting Mobile Communications: The Insecurity of 802.11  

E-print Network

Intercepting Mobile Communications: The Insecurity of 802.11 Nikita Borisov UC Berkeley nikitab 6 suggest some general lessons that can be derived from the WEP insecurities. Finally, Section 7 relies on a secret key £ shared between the communicating parties to protect the body of a transmitted

Sirer, Emin Gun

88

Intercepting Mobile Communications: The Insecurity of 802.11  

E-print Network

Intercepting Mobile Communications: The Insecurity of 802.11 Nikita Borisov UC Berkeley nikitab be derived from the WEP insecurities. Finally, Section 7 offers some conclusions. 2. THE WEP PROTOCOL the communicating parties to protect the body of a transmitted frame of data. Encryp- tion of a frame proceeds

Han, Richard Y.

89

Accountable Anonymous Service Usage in Mobile Communication Systems \\Lambda  

E-print Network

Accountable Anonymous Service Usage in Mobile Communication Systems \\Lambda Levente Butty Abstract We introduce a model that allows of anonymous yet accountable service usage in mo­ bile communication systems. This model is based on the introduction of a new business role, called the customer care

Bencsáth, Boldizsár

90

Optimization of Wireless Resources for Personal Communications Mobility Tracking  

Microsoft Academic Search

In personal communications applications, users communicate via wireless with a wireline net- work. The wireline network tracks the current location of the user, and can therefore route mes- sages to a user regardless of the user's location. In addition to its impact on signaling within the wireline network, mobility tracking requires the expenditure of wireless resources as well, includ- ing

Upamanyu Madhow; Michael L. Honig; Kenneth Steiglitz

1994-01-01

91

Multifunction personal and mobile SMM antenna for satellite communications systems  

Microsoft Academic Search

There are a number of personal and mobile communications systems based on the use of microwave links relayed by Earth-orbiting satellites between small, low-cost Earth terminals using antennas of low directivity and broad beam aiming at the appropriate satellites. These satellite communications systems are now either deployed or in various stages of development and planning. For example, there are the

J. J. H. Wang; J. K. Tillery

1997-01-01

92

RESEARCH COMMUNICATION Targeting genes for  

E-print Network

in turn used to generate chimeric mice. In these chimeras, somatic cells derived from the ES cells embryo-derived stem (ES) cell. Cells containing the modification are placed in an embryonic environmentRESEARCH COMMUNICATION Targeting genes for self-excision in the germ line Michaeline Bunting,1

Capecchi, Mario R.

93

Cockpit weather graphics using mobile satellite communications  

NASA Astrophysics Data System (ADS)

Many new companies are pushing state-of-the-art technology to bring a revolution in the cockpits of General Aviation (GA) aircraft. The vision, according to Dr. Bruce Holmes - the Assistant Director for Aeronautics at National Aeronautics and Space Administration's (NASA) Langley Research Center, is to provide such an advanced flight control system that the motor and cognitive skills you use to drive a car would be very similar to the ones you would use to fly an airplane. We at ViGYAN, Inc., are currently developing a system called the Pilot Weather Advisor (PWxA), which would be a part of such an advanced technology flight management system. The PWxA provides graphical depictions of weather information in the cockpit of aircraft in near real-time, through the use of broadcast satellite communications. The purpose of this system is to improve the safety and utility of GA aircraft operations. Considerable effort is being extended for research in the design of graphical weather systems, notably the works of Scanlon and Dash. The concept of providing pilots with graphical depictions of weather conditions, overlaid on geographical and navigational maps, is extremely powerful.

Seth, Shashi

94

Coded Modulations for Mobile Satellite Communication Channels  

NASA Astrophysics Data System (ADS)

The mobile satellite (MSAT) channel is subject to multipath fading, shadowing, Doppler frequency shift, and adjacent channel interference (ACI). Therefore, transmitted signals face severe amplitude and phase distortions. This dissertation investigates various high performance and low decoding complexity coded modulation schemes for reliable voice and data transmissions over the shadowed mobile satellite channel and the Rayleigh fading channel. The dissertation consists of four parts. The first part presents a systematic technique for constructing MPSK trellis coded modulation (TCM) codes for voice transmission over the MSAT channel. The multilevel coding method is used for constructing TCM codes using convolutional codes with good free branch distances as the component codes or using both convolutional and block codes as the component codes. Simulation results show that these codes achieve good coding gains over the uncoded reference system and outperform existing TCM codes with the same decoding complexity. In the second part, using the multilevel coding method, multilevel block coded modulation (BCM) codes are constructed for voice transmission over the MSAT channel. Even though BCM is generally less power efficient than TCM for AWGN channels, BCM has a great potential to compete with TCM in the MSAT channel because of its shorter decoding depth and hence more effective interleaving. Binary Reed -Muller (RM) codes of length up to 32 are used as component codes. Simulation results show that these codes achieve good coding gains over the uncoded reference system and outperform TCM codes with the same decoding complexity. In the third part, a simple and systematic technique for constructing multilevel concatenated BCM schemes for data transmission over the shadowed MSAT channel and the Rayleigh fading channel is presented. These schemes are designed to achieve high-performance or large coding gain with reduced decoding complexity. Construction is based on a multilevel concatenation approach in which long powerful (binary or non-binary) codes are used as the outer codes and coset codes constructed from a linear BCM code and its subcodes are used as the inner codes. Simulation results show that these codes achieve large coding gains over the uncoded reference system and outperform single-level concatenated BCM codes with the same inner codes. Especially, some multilevel concatenated BCM codes achieve an error-floor free communication at BER of 10^{-5 }. In the final part of the dissertation, product coded modulation schemes are constructed by using multilevel concatenating approach. In product coded modulation, the product coding technique and coded modulation are combined to achieve high performance with reduced decoding complexity. Good product 8-PSK modulation codes are constructed for various shadowed MSAT channels. Simulation results show that these codes achieve large coding gains over the uncoded reference system and outperform single-level concatenated BCM codes with the same inner codes.

Rhee, Dojun

1995-01-01

95

77 FR 35336 - Privacy and Security of Information Stored on Mobile Communications Devices  

Federal Register 2010, 2011, 2012, 2013

...of Information Stored on Mobile Communications Devices...data security practices of mobile wireless services providers...stored on their users' mobile communications devices...FCC504@fcc.gov or phone: 202-418- 0530 or...

2012-06-13

96

Inferring human mobility using communication patterns  

NASA Astrophysics Data System (ADS)

Understanding the patterns of mobility of individuals is crucial for a number of reasons, from city planning to disaster management. There are two common ways of quantifying the amount of travel between locations: by direct observations that often involve privacy issues, e.g., tracking mobile phone locations, or by estimations from models. Typically, such models build on accurate knowledge of the population size at each location. However, when this information is not readily available, their applicability is rather limited. As mobile phones are ubiquitous, our aim is to investigate if mobility patterns can be inferred from aggregated mobile phone call data alone. Using data released by Orange for Ivory Coast, we show that human mobility is well predicted by a simple model based on the frequency of mobile phone calls between two locations and their geographical distance. We argue that the strength of the model comes from directly incorporating the social dimension of mobility. Furthermore, as only aggregated call data is required, the model helps to avoid potential privacy problems.

Palchykov, Vasyl; Mitrovi?, Marija; Jo, Hang-Hyun; Saramäki, Jari; Pan, Raj Kumar

2014-08-01

97

Frontiers of Wireless and Mobile Communications  

E-print Network

because of the popularity of Internet applications on mass-market mobile platforms including smart phones Internet based. By Dipankar Raychaudhuri, Fellow IEEE, and Narayan B. Mandayam, Fellow IEEE ABSTRACT applications as they migrate to mobile Internet platforms. KEYWORDS | Ad hoc and mesh networks; audiovisual

Mandayam, Narayan

98

Presence Aware Location-Based Service For Managing Mobile Communications  

Microsoft Academic Search

Presence technology based on Session Initiation Protocol can be used as an enabling platform for delivering communication and providing event-based services. We present a mobile workforce management solution which integrates fleet management with presence-based communication to show how presence technology can be used to realize location-based communication services. In particular, our solution integrates a user's presence information with their vehicle's

Vishal Kumar Singh; Henning Schulzrinne; Piotr Boni; Boris Elman; David Kenneson

2007-01-01

99

[Communicating research with social media].  

PubMed

Participation is the new keyword of communication. In the scientific field, communication is a very complex task that can't ignore the careful consideration of the target audience. To minimize the difficulties, it is useful to rely on storytelling: it can greatly benefit from the space offered by social media that can be used to raise awareness and to engage through the sharing of experiences. The marriage between scientific research and social media can take place, as long as you carefully reflect on the roles, strategies and appropriate tools. PMID:25229757

Bennato, Davide

2014-09-01

100

[Mobile communication and health of population: estimation of danger, social and ethical problems].  

PubMed

Population lives under new electromagnetic conditions: constant round-the-clock compulsory chronic exposure of all groups of population to modulated wide spectrum of EMF RF during the work of base stations of mobile communication; daily and lifelong (from childhood) exposure of the brain to EMF RF of the mobile phone. Effects of exposure to EMF RF of low levels are presented. Results of research into chronic EMF RF exposure are absent. International recommendations and domestic guidelines do not take into account the changing conditions of EMF RF influence on the population: the brain has become a critical body, and children have been included in the risk group. Population actively continues to use mobile communication. In this situation estimation of the risks from mobile communication has become a social and ethical problem. PMID:21866836

Grigor'ev, Iu G; Grigor'ev, O A

2011-01-01

101

Land mobile communications satellite mission (LAMOCOSAMIS) Task 1: Market study  

NASA Astrophysics Data System (ADS)

Land mobile communication service demand in Europe and the Mediterranean basin in the years 1995-2005 was estimated. A traffic model was derived. There is an exploding demand for land mobile communications in Europe, with overwhelming preference for two way telephone services. The users survey shows a surprising lack of sensitivity to prices and tariffs, which widely contributed to the preeminence of the needs for telephone services. This demand justifies that every effort be made to develop as fast as possible a compatible pan-European terrestrial mobile system. If a large proportion of the needs may be satisfied by terrestrial mobile system solutions, the potential remaining needs for telephony, outside of the presently planned terrestrial mobile, which can be served only by satellite, even under the pessimistic economic scenario and high cost/tariff assumptions, requires a number of equivalent telephone circuits which cannot be achieved with available state of the art technology.

1985-12-01

102

An improved water-filling algorithm for mobile MIMO communication systems over time-varying fading channels  

Microsoft Academic Search

Multiple input multiple output (MIMO) systems that use antenna arrays at both the transmitter and receiver are gaining much more attention and efforts in wireless communication research due to their potential to increase considerably capacity in mobile cellular communications. However, in the real propagation environment of cellular communications, it is difficult to gain the ideal ergodic capacity for time-varying fading

Ligang Ren; Zhijie Yan; Mei Song; Junde Song

2004-01-01

103

FOREST OPERATIONS MANAGEMENT: TOWARDS MOBILE COMMUNICATION  

Microsoft Academic Search

Large worldwide operating forest industry companies use modern information and communication technology (ICT) in forest operations management nowadays. Many of the smaller companies are introducing these systems as well. The necessary condition for the use of these systems is a well developed communication infrastructure of the country. Similar systems are applied elsewhere, too, but they may not be as sophisticated

Esko Mikkonen

104

Communication in context: new directions in communication research  

Microsoft Academic Search

By focusing attention almost exclusively on a single encounter, researchers have adopted a rather restricted view on studying communication in health care. After all, communication does not take place in a vacuum but is influenced by the context in which it takes place. We would therefore strongly recommend to broaden the perspective of communication research. In this respect, four lines

Jozien Bensing; Sandra van Dulmen; Kiek Tates

2003-01-01

105

The 18th Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC'07) Research supported by National Aeronautics and Space  

E-print Network

Institute of Standard & Technology Swiss Federal Institute of Technology College Park, MD, USA Gaithersburg applications. Remote sensing, radio astronomy, passive imaging, radar and high data rate communication are among these applications. To establish a high data rate communication link between two nodes, acceptable

Baras, John S.

106

Advanced mobile satellite communications system using Ka and MM-wave bands in Japan's R and D satellite project  

NASA Technical Reports Server (NTRS)

Communications Research Laboratory (CRL) studied an advanced mobile satellite communications system using Ka and millimeter-wave bands in the R&D Satellite project. The project started in 1990 and the satellite will be launched in 1997. On-board multi-beam interconnecting is one of basic functions to realize one-hop connection among Very Small Aperture Terminals (VSATs), mobile, and hand-held terminals in future mobile satellite communications system. An Intermediate Frequency (IF) filter bank and regenerative transponder are suitable for this function. The transponder configuration of an advanced mobile communications mission of the R&D Satellite for experiment is shown. High power transmitters of Ka and millimeter-wave bands, a 3x3 IF filter band and Single Channel Per Carrier/Time Division Multiplexing (SCPC/TDM) regenerative MODEMS, which will be boarded on the R&D Satellite, are being developed for the purpose of studying the feasibility of advanced mobile communications system.

Isobe, Shunkichi; Ohmori, Shingo; Hamamoto, Naokazu; Yamamoto, Minoru

1991-01-01

107

Mobile satellite communications in the 1990's  

NASA Astrophysics Data System (ADS)

The evolution of Inmarsat global services from a single market and single service of the 1980's to all of the key mobile markets and a wide range of new terminals and services in the 1990's is described. An overview of existing mobile satellite services, as well as new services under implementation for introduction in the near and longer term, including a handheld satellite phone (Inmarsat-P), is provided. The initiative taken by Inmarsat in the integration of its global mobile satellite services with global navigation capability derived from GPS (Global Positioning System) and the GLONASS (Russian GPS) navigation satellite systems and the provision of an international civil overlay for GPS/GLONASS integrity and augmentation is highlighted. To complete the overview of the development of mobile satellite services in the 1990's, the known national and regional mobile satellite system plans and the various recent proposals for both orbiting and geostationary satellite systems for proving handheld satellite phone and/or data messaging services are described.

Singh, Jai

1992-07-01

108

'Travelling while sitting down': Mobile phones, mobility and the communication landscape in Inhambane, Mozambique  

Microsoft Academic Search

This article examines the ways in which young men in the city of Inhambane, southern Mozambique, harness communication to express and address experiences of constrained physical and social mobility. It starts with an analysis of a highly valued form of oral communication – bater papo – that youth, especially young men, engage in on a daily basis before turning to

Julie Soleil Archambault

2012-01-01

109

Potential markets for a satellite-based mobile communications system  

NASA Technical Reports Server (NTRS)

The objective of the study was to define the market needs for improved land mobile communications systems. Within the context of this objective, the following goals were set: (1) characterize the present mobile communications industry; (2) determine the market for an improved system for mobile communications; and (3) define the system requirements as seen from the potential customer's viewpoint. The scope of the study was defined by the following parameters: (1) markets were confined to U.S. and Canada; (2) range of operation generally exceeded 20 miles, but this was not restrictive; (3) the classes of potential users considered included all private sector users, and non-military public sector users; (4) the time span examined was 1975 to 1985; and (5) highly localized users were generally excluded - e.g., taxicabs, and local paging.

Jamieson, W. M.; Peet, C. S.; Bengston, R. J.

1976-01-01

110

Mobility Research and Production Sciences  

E-print Network

. Robert Fischer, Vice President Engineering and Technology, Powertrain Engineering AVL Matthias H. Koch. Koch, Siemens Mobility Graz 17.40 uhr Impulsreferat ,,die rolle des Verbrennungsmotors für die

111

Protocol design for mobile radio group communications over satellite  

Microsoft Academic Search

The protocol design for a mobile radio service supporting half-duplex push-to-talk voice communications over mobile satellite systems is presented. Two types of protocols are considered, namely, a demand assignment multiple access protocol to assign channels only to those user groups in active sessions of conversations and a signaling protocol to arbitrate contentions among members of the same user group within

Victor C. M. Leung

1992-01-01

112

Providing Seamless Communication in Mobile Wireless Networks  

E-print Network

-mail: fbbakshi,pkrishna,pradhan,vaidyag@cs.tamu.edu Phone: (409) 862-3411 Technical Report TR-96-015y May 1, 1996 degradation. The motivation be- hind this study is to nd a cost e ective solution for minimizing impact's cell. Each BS is responsible for forwarding data between the mobile user in it's cell, and the wired

Vaidya, Nitin

113

Control Freaks How Online and Mobile Communication  

E-print Network

Steam engines: pumping water out of mines (Thomas Newcomen and John Calley, 1712) Mainframe computers Manufacture of computers: toxic waste Manufacture of mobile phones: depletion of rare metals 4 #12 was awkward The university-based tech community engaged in much online joking and sarcasm Written language

Lansky, Joshua

114

The use of mobile satellite communication terminals  

NASA Astrophysics Data System (ADS)

The role of small portable terminals in military satellite systems is examined; the discussion embraces terminals with an antenna reflector diameter of seven meters or less. Emphasis is placed on the specification of MARMOSET (Marconi Mobile Satellite Earth Terminal). Also considered are ship-borne satellite terminals, the improved SCOT terminal, interoperability, reduced downlink power, and reliability and availability.

Law, P. A.

115

Land-mobile satellite communication system  

NASA Technical Reports Server (NTRS)

A satellite communications system includes an orbiting communications satellite for relaying communications to and from a plurality of ground stations, and a network management center for making connections via the satellite between the ground stations in response to connection requests received via the satellite from the ground stations, the network management center being configured to provide both open-end service and closed-end service. The network management center of one embodiment is configured to provides both types of service according to a predefined channel access protocol that enables the ground stations to request the type of service desired. The channel access protocol may be configured to adaptively allocate channels to open-end service and closed-end service according to changes in the traffic pattern and include a free-access tree algorithm that coordinates collision resolution among the ground stations.

Yan, Tsun-Yee (Inventor); Rafferty, William (Inventor); Dessouky, Khaled I. (Inventor); Wang, Charles C. (Inventor); Cheng, Unjeng (Inventor)

1993-01-01

116

Mobile satellite service communications tests using a NASA satellite  

NASA Technical Reports Server (NTRS)

Emerging applications of commercial mobile satellite communications include satellite delivery of compact disc (CD) quality radio to car drivers who can select their favorite programming as they drive any distance; transmission of current air traffic data to aircraft; and handheld communication of data and images from any remote corner of the world. Experiments with the enabling technologies and tests and demonstrations of these concepts are being conducted before the first satellite is launched by utilizing an existing NASA spacecraft.

Chambers, Katherine H.; Koschmeder, Louis A.; Hollansworth, James E.; ONeill, Jack; Jones, Robert E.; Gibbons, Richard C.

1995-01-01

117

Mobility of a Disaster Recover Communication System  

Microsoft Academic Search

What is the best platform to build a Disaster Management Communication System (DMCS)? There is a need to investigate how to best use a DMCS. The two most important uses of a DMCS for any size disaster, is the need for information and getting relief to those that need it. The DMCS needs to collect information from the people affected

Edward Sobanski; Barbara Nicolai

2011-01-01

118

Integrating Communication, Computer Access, Environmental Control & Mobility.  

ERIC Educational Resources Information Center

Severely physically disabled people can be helped to reach their goals in educational, vocational, and personal pursuits through appropriate use of current technology. The expressive communication needs of people without functional speech can be met through an analysis of selection techniques, processing, and outputs. Examples of new systems…

Romich, Barry A.; Vagnini, Carol B.

119

NEW INFORMATION COMMUNICATION TECHNOLOGIES AND GRASSROOTS MOBILIZATION  

Microsoft Academic Search

In much of the recent literature on contemporary social movements there is call for a re-conceptualization of the definition and understanding of political struggle given the impact of new emerging information communication technologies (ICTs), and the Internet in particular, on social movement organizing, contentious politics, and the electoral political process. This paper undertakes an analysis of MoveOn within a critical

Victoria Carty

2010-01-01

120

Research Supporting Satellite Communications Technology  

NASA Technical Reports Server (NTRS)

This report describes the second year of research effort under the grant Research Supporting Satellite Communications Technology. The research program consists of two major projects: Fault Tolerant Link Establishment and the design of an Auto-Configurable Receiver. The Fault Tolerant Link Establishment protocol is being developed to assist the designers of satellite clusters to manage the inter-satellite communications. During this second year, the basic protocol design was validated with an extensive testing program. After this testing was completed, a channel error model was added to the protocol to permit the effects of channel errors to be measured. This error generation was used to test the effects of channel errors on Heartbeat and Token message passing. The C-language source code for the protocol modules was delivered to Goddard Space Flight Center for integration with the GSFC testbed. The need for a receiver autoconfiguration capability arises when a satellite-to-ground transmission is interrupted due to an unexpected event, the satellite transponder may reset to an unknown state and begin transmitting in a new mode. During Year 2, we completed testing of these algorithms when noise-induced bit errors were introduced. We also developed and tested an algorithm for estimating the data rate, assuming an NRZ-formatted signal corrupted with additive white Gaussian noise, and we took initial steps in integrating both algorithms into the SDR test bed at GSFC.

Horan Stephen; Lyman, Raphael

2005-01-01

121

Satellite-aided mobile communications, experiments, applications and prospects  

NASA Technical Reports Server (NTRS)

NASA's ATS-series of satellites were used in a series of communications and position fixing experiments with automotive vehicles, ships and aircraft. Applications of the communications were demonstrated and evaluated for public services including law enforcement, search and rescue, and medical emergency, and for commercial uses in the land and maritime transportation industries. The technical success of the experiments and the demonstrated potential value of the communications prompted a study that concluded an operational satellite-aided system would be a valuable augmentation of planned trunking or cellular type terrestrial mobile radio telephone systems.

Anderson, R. E.; Frey, R. L.; Lewis, J. R.; Milton, R. T.

1980-01-01

122

Payload system tradeoffs for mobile communications satellites  

NASA Technical Reports Server (NTRS)

System level trade-offs carried out during Mobile Satellite (M-SAT) design activities are described. These trade-offs relate to the use of low level beam forming, flexible power and spectrum distribution, and selection of the number of beams to cover the service area. It is shown that antenna performance can be improved by sharing horns between beams using a low level beam forming network (BFN). Additionally, greatly increased power utilization is possible using a hybrid matrix concept to share power between beams.

Moody, H. J.

1990-01-01

123

MSAT aeronautical mobile satellite communications terminal development  

NASA Technical Reports Server (NTRS)

CAL has undertaken the development of a new aeronautical mobile terminal for the North American MSAT market. The terminal is to meet the MSAT standard and is aimed in particular at the 300,000 general aviation and business aircraft in North America. The terminals are therefore relatively low cost and small in size when compared to those currently being produced for larger airline aircraft. The terminal incorporates a top mounted mechanical steered antenna and a unique antenna steering subsystem. An overview of the terminal design is presented.

Sutherland, C. A.; Sydor, J. T.

1995-01-01

124

Mobile robotics research at Sandia National Laboratories  

SciTech Connect

Sandia is a National Security Laboratory providing scientific and engineering solutions to meet national needs for both government and industry. As part of this mission, the Intelligent Systems and Robotics Center conducts research and development in robotics and intelligent machine technologies. An overview of Sandia`s mobile robotics research is provided. Recent achievements and future directions in the areas of coordinated mobile manipulation, small smart machines, world modeling, and special application robots are presented.

Morse, W.D.

1998-09-01

125

Mobiware: QoS-aware middleware for mobile multimedia communications  

Microsoft Academic Search

Next generation wireless communications system will be required to support the seamless delivery of voice, video and data with hig h quality. Delivering hard Quality of Service (QOS) guarantees in the wireless domain is complex due t o large-scale mobility requirements, limited radio resources and fluctuati ng network conditions. To address this challenge we are developing a QOS-aware middleware platform

Andrew T. Campbell

1997-01-01

126

A Model and Measure of Mobile Communication Competence  

ERIC Educational Resources Information Center

This article deals with two studies that develop a measure and model of mobile communication competence (MCC). The first study examines the dimensionality of the measure by conducting an exploratory factor analysis on 350 students at a large university in the midwestern United States. Results identified six constructs across 24 items: willingness…

Bakke, Emil

2010-01-01

127

Scheduling and Control of Mobile Communications Networks with Randomly Time  

E-print Network

02912 USA hjk@dam.brown.edu Abstract-- Consider a communications network consisting of mobiles, some are weakened, and the distributions of the in- put file lengths can be heavy tailed. The resulting controls with randomly varying links, routing in ad-hoc networks, perturbed stochastic Liapunov functions, heavy tailed

128

Spread spectrum mobile communication experiment using ETS-V satellite  

NASA Technical Reports Server (NTRS)

The spread spectrum technique is attractive for application to mobile satellite communications, because of its random access capability, immunity to inter-system interference, and robustness to overloading. A novel direct sequence spread spectrum communication equipment is developed for land mobile satellite applications. The equipment is developed based on a matched filter technique to improve the initial acquisition performance. The data rate is 2.4 kilobits per sec. and the PN clock rate is 2.4552 mega-Hz. This equipment also has a function of measuring the multipath delay profile of land mobile satellite channel, making use of a correlation property of a PN code. This paper gives an outline of the equipment and the field test results with ETS-V satellite.

Ikegami, Tetsushi; Suzuki, Ryutaro; Kadowaki, Naoto; Taira, Shinichi; Sato, Nobuyasu

1990-01-01

129

Coherent versus noncoherent signaling for satellite-aided mobile communications  

NASA Technical Reports Server (NTRS)

The use of coherent versus noncoherent communications is an unresolved issue for the mobile satellite community. Should one select the more robust but less efficient noncoherent strategy for communications over satellite-aided mobile channels, or does the introduction of a space platform in the mobile link improve signal stability (both amplitude and phase) such that conventional coherent schemes become attractive? This publication tries to answer some of the questions by discussing the results from experiments using a coherent QPSK receiver. The issues discussed include items such as the measured performance in Rician fading, the link error floor in a fading environment, etc. The results are compared and contrasted with that of a noncoherent limiter/discriminator FM receiver.

Davarian, F.; Sumida, J.

1986-01-01

130

Circadian pattern and burstiness in mobile phone communication  

NASA Astrophysics Data System (ADS)

The temporal communication patterns of human individuals are known to be inhomogeneous or bursty, which is reflected as heavy tail behavior in the inter-event time distribution. As the cause of such a bursty behavior two main mechanisms have been suggested: (i) inhomogeneities due to the circadian and weekly activity patterns and (ii) inhomogeneities rooted in human task execution behavior. In this paper, we investigate the role of these mechanisms by developing and then applying systematic de-seasoning methods to remove the circadian and weekly patterns from the time series of mobile phone communication events of individuals. We find that the heavy tails in the inter-event time distributions remain robust with respect to this procedure, which clearly indicates that the human task execution-based mechanism is a possible cause of the remaining burstiness in temporal mobile phone communication patterns.

Jo, Hang-Hyun; Karsai, Márton; Kertész, János; Kaski, Kimmo

2012-01-01

131

Communicating Research to Small Drinking Water Systems: Dissemination by Researchers  

EPA Science Inventory

This talk discusses the challenges of disseminating research relevant to small systems. The presentation discusses efforts by the U.S. EPA’s Office of Research and Development to effectively communicating drinking water information. In particular, communication approaches ...

132

77 FR 40083 - Certain Personal Data and Mobile Communications Devices and Related Software; Institution of a...  

Federal Register 2010, 2011, 2012, 2013

...Mobile Communications Devices and Related Software; Institution of a Formal Enforcement...Apple Inc., and its subsidiary NeXT Software, Inc., both of Cupertino, California...mobile communications devices and related software. 75 FR 17434 (Apr. 6, 2010)....

2012-07-06

133

78 FR 34132 - Certain Portable Electronic Communications Devices, Including Mobile Phones and Components...  

Federal Register 2010, 2011, 2012, 2013

...Portable Electronic Communications Devices, Including Mobile Phones and Components Thereof; Correction to Notice of Receipt...Portable Electronic Communications Devices, Including Mobile Phones and Components Thereof, DN 2958; the Commission...

2013-06-06

134

Research Priorities in Networking and Communications.  

ERIC Educational Resources Information Center

A workshop focused on major research issues in networking and communications. This report defines the context for research priorities and initiatives and deals with issues in networking and communications. Fifteen major research priorities and four research specific initiatives were identified by participants as areas that should be pursued over…

National Science Foundation, Washington, DC.

135

The Globalstar mobile satellite system for worldwide personal communications  

NASA Technical Reports Server (NTRS)

Loral Aerospace Corporation along with Qualcomm Inc. have developed a satellite system which offers global mobile voice and data services to and from handheld and mobile user terminals with omni-directional antennas. By combining the use of low-earth orbit (LEO) satellites with existing terrestrial communications systems and innovative, highly efficient spread spectrum techniques, the Globalstar system provides users with low-cost, reliable communications throughout the world. The Globalstar space segment consists of a constellation of 48 LEO satellites in circular orbits with 750 NM (1389 km) altitude. Each satellite communicates with the mobile users via the satellite-user links and with gateway stations. The gateway stations handle the interface between the Globalstar network and the OSTN/PLMN systems. Globalstar transceivers are similar to currently proposed digital cellular telephones in size and have a serial number that will allow the end user to make and receive calls from or to that device anywhere in the world. The Globalstar system is designed to operate as a complement to existing local, long-distance, public, private and specialized telecommunications networks. Service is primarily designed to serve the rural and thin route communications needs of consumers, government users, and private networks.

Wiedeman, Robert A.; Viterbi, Andrew J.

1993-01-01

136

Why is CDMA the solution for mobile satellite communication  

NASA Technical Reports Server (NTRS)

It is demonstrated that spread spectrum Code Division Multiple Access (CDMA) systems provide an economically superior solution to satellite mobile communications by increasing the system maximum capacity with respect to single channel per carrier Frequency Division Multiple Access (FDMA) systems. Following the comparative analysis of CDMA and FDMA systems, the design of a model that was developed to test the feasibility of the approach and the performance of a spread spectrum system in a mobile environment. Results of extensive computer simulations as well as laboratory and field tests results are presented.

Gilhousen, Klein S.; Jacobs, Irwin M.; Padovani, Roberto; Weaver, Lindsay A.

1989-01-01

137

Monitoring Heart Disease and Diabetes with Mobile Internet Communications  

PubMed Central

A telemedicine system is described for monitoring vital signs and general health indicators of patients with cardiac and diabetic conditions. Telemetry from wireless sensors and readings from other instruments are combined into a comprehensive set of measured patient parameters. Using a combination of mobile device applications and web browser, the data can be stored, accessed, and displayed using mobile internet communications to the central server. As an extra layer of security in the data transmission, information embedded in the data is used in its verification. The paper highlights features that could be enhanced from previous systems by using alternative components or methods. PMID:23213330

Mulvaney, David; Woodward, Bryan; Datta, Sekharjit; Harvey, Paul; Vyas, Anoop; Thakker, Bhaskar; Farooq, Omar; Istepanian, Robert

2012-01-01

138

Close relationships: A study of mobile communication records  

E-print Network

Mobile phone communication as a digital service generates ever-increasing datasets of human communication actions, which in turn allow us to investigate the structure and evolution of social interactions and their networks. These datasets can be used to study the structuring of such ego-centric networks with respect to the strength of the relationships by assuming monotonic dependence of the communication intensity on the strength of the social tie. Recently we have discovered that there are significant differences between the first and further 'best friends" from the point of view of age and gender preferences. Here we introduce a control parameter, namely the minimum ratio $r_{min}$ between the intensities of communication of the first and second "best friend" and use it to filter the data. We find that when $r_{min}$ is increased the identification of the "best friend" becomes less ambiguous and the earlier observed effects get stronger, thus corroborating them.

Palchykov, Vasyl; Dunbar, Robin I M; Kaski, Kimmo

2012-01-01

139

Close Relationships: A Study of Mobile Communication Records  

NASA Astrophysics Data System (ADS)

Mobile phone communication as digital service generates ever-increasing datasets of human communication actions, which in turn allow us to investigate the structure and evolution of social interactions and their networks. These datasets can be used to study the structuring of such egocentric networks with respect to the strength of the relationships by assuming direct dependence of the communication intensity on the strength of the social tie. Recently we have discovered that there are significant differences between the first and further "best friends" from the point of view of age and gender preferences. Here we introduce a control parameter p max based on the statistics of communication with the first and second "best friend" and use it to filter the data. We find that when p max is decreased the identification of the "best friend" becomes less ambiguous and the earlier observed effects get stronger, thus corroborating them.

Palchykov, Vasyl; Kertész, János; Dunbar, Robin; Kaski, Kimmo

2013-05-01

140

Communication Policy and Theory: Current Perspectives on Mass Communication Research.  

ERIC Educational Resources Information Center

The integration of American and European mass communication research models would provide a broader sociocultural framework for formulating communication policy. Emphasizing a functional approach, the American diffusionist model assumes that society is a system of interrelated parts naturally tending toward a state of dynamic equilibrium. The…

Bybee, Carl R.; Cahn, Dudley D.

141

Neurotalk: improving the communication of neuroscience research  

Microsoft Academic Search

There is increasing pressure for neuroscientists to communicate their research and the societal implications of their findings to the public. Communicating science is challenging, and the transformation of communication by digital and interactive media increases the complexity of the challenge. To facilitate dialogue with the public in this new media landscape, we suggest three courses of action for the neuroscience

Mary Anne Moser; Jennifer B. McCormick; Eric Racine; Sandra Blakeslee; Arthur Caplan; Erika Check Hayden; Jay Ingram; Tiffany Lohwater; Peter McKnight; Christie Nicholson; Anthony Phillips; Kevin D. Sauvé; Elaine Snell; Samuel Weiss; Judy Illes

2009-01-01

142

FEC decoder design optimization for mobile satellite communications  

NASA Technical Reports Server (NTRS)

A new telecommunications service for location determination via satellite is being proposed for the continental USA and Europe, which provides users with the capability to find the location of, and communicate from, a moving vehicle to a central hub and vice versa. This communications system is expected to operate in an extremely noisy channel in the presence of fading. In order to achieve high levels of data integrity, it is essential to employ forward error correcting (FEC) encoding and decoding techniques in such mobile satellite systems. A constraint length k = 7 FEC decoder has been implemented in a single chip for such systems. The single chip implementation of the maximum likelihood decoder helps to minimize the cost, size, and power consumption, and improves the bit error rate (BER) performance of the mobile earth terminal (MET).

Roy, Ashim; Lewi, Leng

1990-01-01

143

Adaptive channel estimation and equalization for rapidly mobile communication channels  

Microsoft Academic Search

This paper presents a reduced-complexity maximum-likelihood sequence estimation receiver, based on the Viterbi algorithm (VA), suitable for rapidly fading mobile communication channels. The channel impulse response is expanded onto a set of basis sequences and time-invariant (TI) expansion parameters. The proposed receiver continuously estimates the TI expansion parameters directly within the metric calculation of the VA. At every time instant

Ahmed El-sayed El-mahdy

2004-01-01

144

Emerging Questions and Research Paradigms in Business Communication Research.  

ERIC Educational Resources Information Center

Describes what business communication professors and practitioners believe are the most important research issues. Compares research being published to that which is rated as the most important. Lists criteria of good business communication research. Determines the extent to which the published research is meeting the criteria for good business…

Smeltzer, Larry R.

1993-01-01

145

The Contemporary Relevance of Communication Research: Using "Communication Currents" in the Communication Curriculum  

ERIC Educational Resources Information Center

The purpose of this report is to describe a rationale and strategies for use of the National Communication Association's online magazine, "Communication Currents", in the undergraduate communication curriculum. "Communication Currents" features essays that translate current scholarship published in NCA journals, making the research "understandable…

Waldeck, Jennifer H.

2008-01-01

146

Land mobile communications satellite missions (LAMOCOSAMIS) task 2: Functional requirements  

NASA Astrophysics Data System (ADS)

Existing, planned, and foreseeable land mobile communication services in Europe were reviewed. Functional characteristics of available and new services were studied. Assumptions on global architecture were made. Regulatory aspects were investigated. The system should offer two-way telephony with the same quality as for the wire network; continous coverage, except in the low population density area, and including coverage of the coastal area; at least 10 Erlangs/sq km, allowing for a 25 mE per subscriber to serve 400 subscribers/sq km; possibility to call a mobile subscriber without knowing its geographical position, switched-on mobile terminal being permanently located by the system (roaming); automatic switchover of calls without break when a mobile moves from one cell to another (handover); service to users of public transport; possibility to use portable or pocket mobile terminal; and data transmission either by using a modem on the actual analog systems, or directly on the future digital systems, allowing message transmission or facsimile, connection of computer or terminals, with the possibility of integration in the future Integrated Service Digital Network.

1985-12-01

147

Research on ultra-realistic communications  

NASA Astrophysics Data System (ADS)

A future communication method enabled by information communications technology- ultra-realistic communication - is now being investigated in Japan and research and development of the various technologies required for its realization is being conducted, such as ultra-high definition TV, 3DTV, super surround sound reproduction and multi-sensory communication including touch and smell. An organization called the Ultra-Realistic Communications Forum (URCF) was also established for the effective promotion of R&D and the standardization of relating technologies. This document explains the activities of the URCF by industry, academia and government, and introduces researches on ultra-realistic communications in the National Institute of Information and Communications Technology (NICT).

Enami, Kazumasa

2009-05-01

148

Driving forces of researchers mobility  

PubMed Central

Starting from the dataset of the publication corpus of the APS during the period 1955–2009, we reconstruct the individual researchers trajectories, namely the list of the consecutive affiliations for each scholar. Crossing this information with different geographic datasets we embed these trajectories in a spatial framework. Using methods from network theory and complex systems analysis we characterise these patterns in terms of topological network properties and we analyse the dependence of an academic path across different dimensions: the distance between two subsequent positions, the relative importance of the institutions (in terms of number of publications) and some socio–cultural traits. We show that distance is not always a good predictor for the next affiliation while other factors like “the previous steps” of the career of the researchers (in particular the first position) or the linguistic and historical similarity between two countries can have an important impact. Finally we show that the dataset exhibit a memory effect, hence the fate of a career strongly depends from the first two affiliations. PMID:24810800

Gargiulo, Floriana; Carletti, Timoteo

2014-01-01

149

Overview of NASA Glenn Aero/Mobile Communication Demonstrations  

NASA Technical Reports Server (NTRS)

The Glenn Research Center at Lewis Field (GRC) has been involved with several other NASA field centers on various networking and RF communications demonstrations and experiments since 1998. These collaborative experiments investigated communications technologies new to aviation, such as wideband Ku satcom, L-band narrowband satcom, and IP (Internet Protocol), using commercial off-the-shelf (COTS) components These technologies can be used to distribute weather and hazard data, air traffic management and airline fleet management information, and passenger cabin Internet service.

Brooks, David; Hoder, Doug; Wilkins, Ryan

2004-01-01

150

Overview of NASA Glenn Aero/Mobile Communications Demonstrations  

NASA Technical Reports Server (NTRS)

The Glenn Research Center at Lewis Field (GRC) has been involved with several other NASA field centers on various networking and RF communications demonstrations and experiments since 1998. These collaborative experiments investigated communications technologies new to aviation, such as wideband Ku satcom, L-band narrowband satcom, and IP (Internet Protocol), using commercial off-the-shelf (COTS) components These technologies can be used to distribute weather and hazard data, air traffic management and airline fleet management information, and passenger cabin Internet service.

Brooks, David; Hoder, Doug; Wilkins, Ryan

2004-01-01

151

PERCEPTIONS OF SECURITY AND PRIVACY WHEN USING MOBILE COMMUNICATION SYSTEMS An Analysis of Administrative and Line Staff Congruence  

Microsoft Academic Search

Mobile communication systems have revolutionized business communication and become common communication tools within business organizations. The dramatic increase in the use of mobile communication systems would not have been possible without the assumption of information security and privacy. However, in many workplaces, this assumption is wrong, and, in fact, mobile communications are vulnerable in many ways. The purpose of this

Cheon-Pyo Lee; Xin Luo; Merrill Warkentin

152

Energy and environmental aspects of mobile communication systems  

E-print Network

The reduction of the energy consumptions of a Telecommunication Power System represents one of the critical factors of the telecommunication technologies, both to allow a sizeable saving of economic resources and to realize "sustainable" development actions. The consumption of about one hundred base stations for mobile phones were monitored for a total of over one thousand days, in order to study the energy consumption in relation to the environmental, electric and logistics parameters of the stations themselves. It was possible to survey, then, the role of the mobile communication systems in the general national energy framework and to plot the best areas of intervention for saving energy and improving the environmental impact, showing the role played by air conditioning and transmission equipments. Finally, new transmission algorithms and the use of renewable energy based techniques have been tested.

Lubritto, C; Vetromile, C; Curcuruto, S; Logorelli, M; Marsico, G; D'Onofrio, A; 10.1016/j.energy.2010.11.039

2011-01-01

153

More About Lens Antenna For Mobile/Satellite Communication  

NASA Technical Reports Server (NTRS)

Report presents additional details of design of proposed phased-array antenna described in "Lens Antenna for Mobile/Satellite Communication" (NPO-16948). Intended to be compact and to lie flat on top of vehicle on ground. Transmits and receives circularly polarized radiation in frequency ranges of 821 to 825 MHz and 860 to 870 MHz. Transmitting and receiving beams electronically steerable to any of 48 evenly spaced directions to provide complete azimuth coverage, and would be fixed, but wide, in elevation, to provide coverage at elevation angles from 20 degrees to 60 degrees.

Rahmat-Samii, Y.; Bodnar, D. G.; Rainer, B. K.

1990-01-01

154

Patient-centered Communication Research  

Cancer.gov

Several recent reports, including NCI's Strategic Plan for Leading the Nation and the NCI-designated cancer center directors' report Accelerating Successes Against Cancer, have recognized the salience of patient-clinician communication in optimizing cancer patients' and survivors' health outcomes.

155

Koubachi: A Mobile Phone Widget to Enable Affective Communication with Indoor Plants  

E-print Network

Koubachi: A Mobile Phone Widget to Enable Affective Communication with Indoor Plants Philipp of the plant. The user can access this data at all times through a small mobile phone application, a so called mobile widget. In case the node detects a change in the health status, the mobile widget is brought

156

Design for Social Presence and Exploring Its Mediating Effect in Mobile Data Communication Services  

ERIC Educational Resources Information Center

The mobility, flexibility, convenience, and ubiquity of mobile data services (MDS) have contributed to their enormous growth and popularity with users. MDS allow users to communicate through mobile texting (mTexting), mobile Instant Messaging (mIM), multimedia messaging services (MMS), and email. A unique feature of MDS that enhances its…

Ogara, Solomon Omondi

2011-01-01

157

Towards Efficient Mobile M2M Communications: Survey and Open Challenges  

PubMed Central

Machine-to-Machine (M2M) communications enable networked devices and services to exchange information and perform actions seamlessly without the need for human intervention. They are viewed as a key enabler of the Internet of Things (IoT) and ubiquitous applications, like mobile healthcare, telemetry, or intelligent transport systems. We survey existing work on mobile M2M communications, we identify open challenges that have a direct impact on performance and resource usage efficiency, especially the impact on energy efficiency, and we review techniques to improve communications. We review the ETSI standard and application protocols, and draw considerations on the impact of their use in constrained mobile devices. Nowadays, smartphones are equipped with a wide range of embedded sensors, with varied local and wide area connectivity capabilities, and thus they offer a unique opportunity to serve as mobile gateways for other more constrained devices with local connectivity. At the same time, they can gather context data about users and environment from the embedded sensors. These capabilities may be crucial for mobile M2M applications. Finally, in this paper, we consider a scenario where smartphones are used as gateways that collect and aggregate data from sensors in a cellular network. We conclude that, in order for their use to the feasible in terms of a normal depletion time of a smartphone's battery, it is a good advice to maximize the collection of data necessary to be transmitted from nearby sensors, and maximize the intervals between transmissions. More research is required to devise energy efficient transmission methods that enable the use of smartphones as mobile gateways. PMID:25333291

Pereira, Carlos; Aguiar, Ana

2014-01-01

158

Robust Timing Synchronization in Aeronautical Mobile Communication Systems  

NASA Technical Reports Server (NTRS)

This work details a study of robust synchronization schemes suitable for satellite to mobile aeronautical applications. A new scheme, the Modified Sliding Window Synchronizer (MSWS), is devised and compared with existing schemes, including the traditional Early-Late Gate Synchronizer (ELGS), the Gardner Zero-Crossing Detector (GZCD), and the Sliding Window Synchronizer (SWS). Performance of the synchronization schemes is evaluated by a set of metrics that indicate performance in digital communications systems. The metrics are convergence time, mean square phase error (or root mean-square phase error), lowest SNR for locking, initial frequency offset performance, midstream frequency offset performance, and system complexity. The performance of the synchronizers is evaluated by means of Matlab simulation models. A simulation platform is devised to model the satellite to mobile aeronautical channel, consisting of a Quadrature Phase Shift Keying modulator, an additive white Gaussian noise channel, and a demodulator front end. Simulation results show that the MSWS provides the most robust performance at the cost of system complexity. The GZCD provides a good tradeoff between robustness and system complexity for communication systems that require high symbol rates or low overall system costs. The ELGS has a high system complexity despite its average performance. Overall, the SWS, originally designed for multi-carrier systems, performs very poorly in single-carrier communications systems. Table 5.1 in Section 5 provides a ranking of each of the synchronization schemes in terms of the metrics set forth in Section 4.1. Details of comparison are given in Section 5. Based on the results presented in Table 5, it is safe to say that the most robust synchronization scheme examined in this work is the high-sample-rate Modified Sliding Window Synchronizer. A close second is its low-sample-rate cousin. The tradeoff between complexity and lowest mean-square phase error determines the rankings of the Gardner Zero-Crossing Detector and both versions of the Early-Late Gate Synchronizer. The least robust models are the high and low-sample-rate Sliding Window Synchronizers. Consequently, the recommended replacement synchronizer for NASA's Advanced Air Transportation Technologies mobile aeronautical communications system is the high-sample-rate Modified Sliding Window Synchronizer. By incorporating this synchronizer into their system, NASA can be assured that their system will be operational in extremely adverse conditions. The quick convergence time of the MSWS should allow the use of high-level protocols. However, if NASA feels that reduced system complexity is the most important aspect of their replacement synchronizer, the Gardner Zero-Crossing Detector would be the best choice.

Xiong, Fu-Qin; Pinchak, Stanley

2004-01-01

159

Support of Communications Policy Research.  

ERIC Educational Resources Information Center

There are three reasons to suspect the integrity of research that purports to validate policy decisions in the field of telecommunications: 1) the accuracy of measurement of input and output variables is dubious; 2) the adversary style of decision-making that dominates the field of telecommunications encourages researchers to arrive at only those…

Homet, Roland S., Jr.

160

Broadband and scalable mobile satellite communication system for future access networks  

NASA Astrophysics Data System (ADS)

Due to the recent market trends, NTT has begun research into next generation satellite communication systems, such as broadband and scalable mobile communication systems. One service application objective is to provide broadband Internet access for transportation systems, temporal broadband access networks and telemetries to remote areas. While these are niche markets the total amount of capacity should be significant. We set a 1-Gb/s total transmission capacity as our goal. Our key concern is the system cost, which means that the system should be unified system with diversified services and not tailored for each application. As satellites account for a large portion of the total system cost, we set the target satellite size as a small, one-ton class dry mass with a 2-kW class payload power. In addition to the payload power and weight, the mobile satellite's frequency band is extremely limited. Therefore, we need to develop innovative technologies that will reduce the weight and maximize spectrum and power efficiency. Another challenge is the need for the system to handle up to 50 dB and a wide data rate range of other applications. This paper describes the key communication system technologies; the frequency reuse strategy, multiplexing scheme, resource allocation scheme, and QoS management algorithm to ensure excellent spectrum efficiency and support a variety of services and quality requirements in the mobile environment.

Ohata, Kohei; Kobayashi, Kiyoshi; Nakahira, Katsuya; Ueba, Masazumi

2005-07-01

161

RESEARCH COMMUNICATION siRNAs can function  

E-print Network

RESEARCH COMMUNICATION siRNAs can function as miRNAs John G. Doench,1,3 Christian P. Petersen,1 for Brain Research, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA pathway of siRNA-directed mRNA cleav- age and the miRNA-mediated translational repression pathway

Arnold, Jonathan

162

Abstract--Securing multicast communications in Mobile Ad Hoc Networks (MANET) is considered among the most challenging  

E-print Network

Abstract--Securing multicast communications in Mobile Ad Hoc Networks (MANET) is considered among the most challenging research directions in the areas of wireless networking and security. MANET for these applications. However, the limitations of the dynamic, infrastructure-less nature of MANET impose major

Baras, John S.

163

Considerations of digital phase modulation for narrowband satellite mobile communication  

NASA Technical Reports Server (NTRS)

The Inmarsat-M system for mobile satellite communication is specified as a frequency division multiple access (FDMA) system, applying Offset Quadrature Phase Shift Keying (QPSK) for transmitting 8 kbit/sec in 10 kHz user channel bandwidth. We consider Digital Phase Modulation (DPM) as an alternative modulation format for INMARSAT-M. DPM is similar to Continuous Phase Modulation (CPM) except that DPM has a finite memory in the premodular filter with a continuous varying modulation index. It is shown that DPM with 64 states in the VA obtains a lower bit error rate (BER). Results for a 5 kHz system, with the same 8 kbit/sec transmitted bitstream, is also presented.

Grythe, Knut

1990-01-01

164

Speech coding at 4800 bps for mobile satellite communications  

NASA Technical Reports Server (NTRS)

A speech compression project has recently been completed to develop a speech coding algorithm suitable for operation in a mobile satellite environment aimed at providing telephone quality natural speech at 4.8 kbps. The work has resulted in two alternative techniques which achieve reasonably good communications quality at 4.8 kbps while tolerating vehicle noise and rather severe channel impairments. The algorithms are embodied in a compact self-contained prototype consisting of two AT and T 32-bit floating-point DSP32 digital signal processors (DSP). A Motorola 68HC11 microcomputer chip serves as the board controller and interface handler. On a wirewrapped card, the prototype's circuit footprint amounts to only 200 sq cm, and consumes about 9 watts of power.

Gersho, Allen; Chan, Wai-Yip; Davidson, Grant; Chen, Juin-Hwey; Yong, Mei

1988-01-01

165

Isolated and coupled superquadric loop antennas for mobile communications applications  

NASA Technical Reports Server (NTRS)

This work provides an investigation of the performance of loop antennas for use in mobile communications applications. The analysis tools developed allow for high flexibility by representing the loop antenna as a superquadric curve, which includes the case of circular, elliptical, and rectangular loops. The antenna may be in an isolated environment, located above an infinite ground plane, or placed near a finite conducting plate or box. In cases where coupled loops are used, the two loops may have arbitrary relative positions and orientations. Several design examples are included to illustrate the versatility of the analysis capabilities. The performance of coupled loops arranged in a diversity scheme is also evaluated, and it is found that high diversity gain can be achieved even when the antennas are closely spaced.

Jensen, Michael A.; Rahmat-Samii, Yahya

1993-01-01

166

Speech coding at 4800 bps for mobile satellite communications  

NASA Astrophysics Data System (ADS)

A speech compression project has recently been completed to develop a speech coding algorithm suitable for operation in a mobile satellite environment aimed at providing telephone quality natural speech at 4.8 kbps. The work has resulted in two alternative techniques which achieve reasonably good communications quality at 4.8 kbps while tolerating vehicle noise and rather severe channel impairments. The algorithms are embodied in a compact self-contained prototype consisting of two AT and T 32-bit floating-point DSP32 digital signal processors (DSP). A Motorola 68HC11 microcomputer chip serves as the board controller and interface handler. On a wirewrapped card, the prototype's circuit footprint amounts to only 200 sq cm, and consumes about 9 watts of power.

Gersho, Allen; Chan, Wai-Yip; Davidson, Grant; Chen, Juin-Hwey; Yong, Mei

1988-05-01

167

Scientific Communication in Educational Research.  

ERIC Educational Resources Information Center

This study focused on the production, dissemination, and assimilation of material published in the major journals on educational research--four "core" journals and three "tangential." Two questionnaires were used: one sent to the authors of all articles published in 1968 and 1969, and the second to the persons whom these authors cited as working…

Nelson, Carnot E.

168

A study and experiment plan for digital mobile communication via satellite  

Microsoft Academic Search

The viability of mobile communications is examined within the context of a frequency division multiple access, single channel per carrier satellite system emphasizing digital techniques to serve a large population of users. The intent is to provide the mobile users with a grade of service consistant with the requirements for remote, rural (perhaps emergency) voice communications, but which approaches toll

J. J. Jones; E. J. Craighill; R. G. Evans; A. D. Vincze; N. N. Tom

1978-01-01

169

Assessing mobile phone communication utility preferences in a social support network  

Microsoft Academic Search

While it is generally accepted that the mobile cell phone has become ubiquitous within society for communicating, the actual use of the utilities on a phone have not been reported. Understanding how communication patterns are changing in society as a result of the mobile cell phone will enable the development and\\/or modification of existing cell phone utilities, the concept of

Elizabeth M. LaRue; Ann M. Mitchell; Lauren Terhorst; Hassan A. Karimi

2010-01-01

170

Satellite constellations summary, analysis and design for China mobile satellite communication  

Microsoft Academic Search

We proposed and studied a number of methods of satellite constellation design for regional mobile satellite communication (MSC), and obtained some useful results for China's regional MSC. These methods of constellation design can also be applied for other regional mobile satellite communication systems

Duan Shaohua; Zhang Zhongzhao; Zhang Naitong

1998-01-01

171

Canada Research Chair (Tier 2) Environmental Risk Management and Communication  

E-print Network

Canada Research Chair (Tier 2) Environmental Risk Management and Communication School and Communication. We seek a faculty member whose research and scholarly interests link the study of environmental (including governance, policy, law, assess- ment and management), communication approaches to hazards

Saskatchewan, University of

172

Hybrid beam steering system for laser communication between mobile platforms  

NASA Astrophysics Data System (ADS)

For many practical needs, laser communication systems must support operation between mobile platforms. Engineering robust links; however, will depend on several innovations. In particular, successful pointing, acquisition, and tracking (PAT) require the use of a beacon signal and the capability of accurate and agile alignment of the line-of-sight (LOS) between the communicating terminals performed over a large field of regard. While mechanical devices, such as gimbals, offer relatively slow tracking over a very wide range, they lack in pointing bandwidth necessary for rejecting high frequency vibrations and beam deflection caused by the optical turbulence. In contrast, fast steering and especially non-mechanical devices, such as Bragg cells, enjoy very high bandwidth (on the order of several kHz), but their effective range is very small. Inherent limitations of both gimbals and fast steerers result in shortcomings of the entire PAT system when either of these devices is used as a sole beam steerer. Therefore, focus needs to be shifted to hybrid architectures, exploiting the advantages of the constituting elements. This paper demonstrates a system combining a robotic manipulator with two acousto-optic cells and presents the algorithm development and the simulation results.

Nikulin, Vladimir V.; Nicholson, Donald J.

2007-02-01

173

Mobile Phones as Tool to Increase Communication and Location Awareness of Users  

E-print Network

Mobile Phones as Tool to Increase Communication and Location Awareness of Users Albrecht Schmidt.Atterer}@ifi.lmu.de ABSTRACT Mobile phones have become a ubiquitous technology and for many people a daily companion. The prime capabilities of mobile phones that can support the creation of persuasive technologies. The focus of the work

174

EMERGING PATTERNS OF AMERICAN MOBILE PHONE USE: Electronically-mediated communication in transition  

E-print Network

EMERGING PATTERNS OF AMERICAN MOBILE PHONE USE: Electronically-mediated communication in transition campuses regarding their use of mobile phones for both talking and texting. The results suggest that the mobile phone platform is still a medium in transition but that some usage patterns may be gender

Carlini, David

175

Low and Medium-Gain antennas for Mobile Satellite Communications (MSC) and Navigation  

Microsoft Academic Search

In this paper are introduced Low-Gain Omnidirectional Antennas for Mobile Satellite Communications (MSC) and Navigation. In many respects the Mobile Satellite Antenna (MSA) infrastructures currently available for MSC and Navigation. Medium and high gain MSA need to track the satellite, following both movements of mobiles and satellite orbital motions. Sometimes this is difficult and expensive to synchronize and have to

Stojce Dimov Ilcev

2011-01-01

176

How can we use mobile apps for disaster communications in Taiwan: Problems and possible practice  

Microsoft Academic Search

The growth rate of global smart phone in 2010 is as high as 78.1%, showing that smart phone gradually becomes the mainstream in the mobile phone market. Smart phone has the function of installing applications, provides users with more diversified mobile value-added services and will change users' communication habits in the future. Mobile communication follows the development trend of 3G

Sz Jie Sung

2011-01-01

177

An overview of the OmniTRACS: The first operational mobile Ku-band satellite communications  

NASA Technical Reports Server (NTRS)

The service features of the OmniTRACS system developed by Omninet Communications Services of Los Angeles, California are described. This system is the first operational mobile Ku-band satellite communications system that provides two-way messaging and position determination and reporting services to mobile users on a nationwide basis. The system uses existing Ku-band satellites under a secondary international allocation for mobile satellite services.

Salmasi, Allen

1988-01-01

178

RESEARCH COMMUNICATION Mad2 prevents aneuploidy and  

E-print Network

RESEARCH COMMUNICATION Mad2 prevents aneuploidy and premature proteolysis of cyclin B and securin of Surgical and Reproductive Sciences, The Medical School, University of Newcastle, Newcastle upon Tyne NE2 4- somes at meiosis I and sister chromatids at meiosis II. Although female meiosis I errors are the major

Villefranche sur mer

179

Fisheries Research 86 (2007) 285288 Short communication  

E-print Network

Fisheries Research 86 (2007) 285­288 Short communication A comparison of the effect of three common Three tagging methods ­ T-bar tags, streamer tags and visual implant elastomer (VIE) ­ were tested (95% survival after 60 d). T-bar tags did not significantly affect short-term survival either

Claverie, Thomas

180

A self-verification authentication mechanism for mobile satellite communication systems  

Microsoft Academic Search

In order to provide an opportunity to make personal communication as broad as possible, mobile satellite communication systems have recently drawn much attention. However, any communication system raises two major challenging issues: (1) how to determine whether actors are whom they claim to be; and (2) how to protect data against unauthorized disclosure. Although the secret-key cryptosystem (SKC) and the

Tzung-Her Chen; Wei-Bin Lee; Hsing-Bai Chen

2009-01-01

181

Study on Communication between Home and School System Based on Mobile Education Platform  

Microsoft Academic Search

As the two significant sides of the education, it is all-important to communicate and intercourse between the home and school. With the development of the information and the internet, Notebook computers, mobile phones and other modern communications equipments continues to increase, they are constructing the timely exchange of information and the emotion platform. So this article firstly introduces the communication

Weifeng Jiao; Jialing Zhao

2007-01-01

182

A Robust and Affordable Mobile Communications System for Emergency Management and Crisis Response  

E-print Network

A Robust and Affordable Mobile Communications System for Emergency Management and Crisis Response Vegas, Nevada, USA. The Need for "First Responder" Integrated Emergency Communications In today's hyper, emergency managers, and relief workers may struggle to communicate during a crisis. Further, we do not all

Bowman, Michael

183

Int. J. Emergency Management, Vol. 4, No. 4, 2007 649 Robust and affordable mobile communications for  

E-print Network

Int. J. Emergency Management, Vol. 4, No. 4, 2007 649 Robust and affordable mobile communications.gantt@murraystate.edu Abstract: During any emergency reliable communications can be a matter of life-and-death. First-responder communications are widely seen as a critical emergency management issue identified by Hurricane Katrina

Bowman, Michael

184

Communication-Aware Surveillance in Mobile Sensor Networks Alireza Ghaffarkhah and Yasamin Mostofi  

E-print Network

Communication-Aware Surveillance in Mobile Sensor Networks Alireza Ghaffarkhah and Yasamin Mostofi to a fixed base station, in the pres- ence of realistic fading communication channels. We develop a mathematical framework for robust communication-aware surveillance, in order to survey the environment

Mostofi, Yasamin

185

The research of mobile application user experience and assessment model  

Microsoft Academic Search

This essay mainly study mobile application user experience and quantitative assessment through Analytic Hierarchy Process. On the basis of the relational studies, this paper put forward four-dimensional assessment system of mobile application user experience. That is: user characteristics, App properties, App system supports and context parameters. What's more, combining user research, paper offers a comprehensive hierarchy criterion framework for mobile

Zhi Chen; Shangshang Zhu

2011-01-01

186

Using satellite communications for a mobile computer network  

NASA Technical Reports Server (NTRS)

The topics discussed include the following: patrol car automation, mobile computer network, network requirements, network design overview, MCN mobile network software, MCN hub operation, mobile satellite software, hub satellite software, the benefits of patrol car automation, the benefits of satellite mobile computing, and national law enforcement satellite.

Wyman, Douglas J.

1993-01-01

187

Mobile Internet Experience Research Based on TAM  

Microsoft Academic Search

The experience is everything, and we have never had so much experience to try. Mobile internet experience has become one of the new experiences in life. Firstly, this article describes the use intention of mobile Internet in China which both quantity of Chinese mobile internet users and using frequency are low. Secondly, based on TAM and flow experience theory this

Su Hailin

2010-01-01

188

The role of interpersonal communication in the process of knowledge mobilization within a community-based organization: a network analysis  

PubMed Central

Background Diffusion of innovations theory has been widely used to explain knowledge mobilization of research findings. This theory posits that individuals who are more interpersonally connected within an organization may be more likely to adopt an innovation (e.g., research evidence) than individuals who are less interconnected. Research examining this tenet of diffusion of innovations theory in the knowledge mobilization literature is limited. The purpose of the present study was to use network analysis to examine the role of interpersonal communication in the adoption and mobilization of the physical activity guidelines for people with spinal cord injury (SCI) among staff in a community-based organization (CBO). Methods The study used a cross-sectional, whole-network design. In total, 56 staff completed the network survey. Adoption of the guidelines was assessed using Rogers’ innovation-decision process and interpersonal communication was assessed using an online network instrument. Results The patterns of densities observed within the network were indicative of a core-periphery structure revealing that interpersonal communication was greater within the core than between the core and periphery and within the periphery. Membership in the core, as opposed to membership in the periphery, was associated with greater knowledge of the evidence-based physical activity resources available and engagement in physical activity promotion behaviours (ps?communication is associated with knowledge mobilization and highlight how the network structure could be improved for further dissemination efforts. Keywords: diffusion of innovations; network analysis; community-based organization; knowledge mobilization; knowledge translation, interpersonal communication. PMID:24886429

2014-01-01

189

David Florida Laboratory: Support for mobile satellite communications  

NASA Technical Reports Server (NTRS)

The comprehensive integration and environmental (including RF) test facilities of the Canadian Space Agency's David Florida Laboratory (CSA)(DFL) were used extensively for the MSAT Program. Following a description of the facilities, the paper outlines their application to the qualification of the two MSAT satellites following an overview of the test plan. Particular emphasis is given to passive intermodulation measurement (PIM) demands, which for the MSAT satellites, contributed to the need to extend the anechoic chamber. The extended chamber was also used for an EMC test and SAR signature test of the RADARSAT satellite. The DFL's facilities are being used for additional aspects of mobile satellite communications. One shielded anechoic Extra High Frequency (EHF) chamber and associated test equipment are employed predominantly for measuring the performance of the IRIDIUM satellites' Engineering Model Gateway Moveable Antennas (EM)(GMA). Other chambers are used for testing aeronautical antennas on behalf of Inmarsat. Still others combine thermal and PIM testing. The paper concludes with a review of the test requirements of evolving satcom missions such as Inmarsat Aero-1.

Dumoulin, Jean-Guy; Mamen, Rolf

1995-01-01

190

A narrowband tactical communication system for the VHF and UHF mobile radio bands  

NASA Astrophysics Data System (ADS)

A description of the research effort, performed in accordance with a National Defense (DND) sponsored Research Program, is presented. Goals fixed for the program aim at achieving good quality, encryptable voice communications in the VHF and UHF mobile bands within a channel spacing of about 3 kHz. A review of the desirable performance objectives of a land-mobile tactical voice communications system is presented, and the design strategy suggested to achieve this performance is described. Implementation includes the use of techniques such as frequency domain digital signal processing of single sideband speech, speech bandwidth reduction, and linear modulation. A study, and in some cases experimental evaluation, on promising bandwidth reduction techniques was done, and a method, called the dynamic frequency band extraction technique, was developed for this application. With this technique, a good voice quality is obtained by dynamically saving only about 1200 Hz of the original 3000 Hz voice spectrum. Taking into account the extra bandwidth required by the data, the frequency domain filtering, and the pulse shaping of the discrete-time samples, and using a highly linear power amplifier, the RF channel spacing of the modulated signal is expected to be approx. of 2.5 kHz.

Boucher, L.; Jolly, Y.; Lodge, J. H.

1989-12-01

191

A Study on the Role of Mobile Phone Communication in Tuberculosis DOTS Treatment  

PubMed Central

Background: Every year, a lot of Tuberculosis (TB) patients undergo Directly Observed Treatment Short-course (DOTS) in Salem city, one of the high TB districts in South India. Mobile phone usage among these patients and health workers is common. Mobile phone communication has a great potential in TB treatment. Objectives: To analyze the mobile phone usage and its effectiveness in TB DOTS treatment. Materials and Methods: A cross-sectional survey with 150 TB patients was followed by a focus group discussion with treatment supervisors, DOTS providers, and health workers. Results: Majority of patients use mobile phones to make calls to health workers to clarify their doubts on side effects, food, and symptoms of the disease. TB treatment supervisors effectively use mobile phones to counsel patients to adhere to the treatment regimen. Patients see mobile phones as a useful communication tool in TB treatment though they prefer direct interpersonal communication with health workers. Though the mobile ownership is 68% among the TB patients, many of them are not able to send text messages or read messages in English. Conclusion: Mobile phone possession and usage is high among the patients. Patients need to be trained to use mobile phone features such as alarm, voice mail, and interactive voice response. Incentives like free talk time and short message service (SMS) will encourage patients to communicate frequently with health workers, thereby, increasing the chances of better adherence to DOTS. SMS could be made available in the regional languages. PMID:24302824

Elangovan, R; Arulchelvan, S

2013-01-01

192

Concepts of “culture”: Implications for intercultural communication research  

Microsoft Academic Search

The notion of “culture” currently used by intercultural communication scholars emerges out of a specific set of historical circumstances, in particular, the 1940s and Edward T. Hall's work at the Foreign Service Institute. This article reviews intercultural communication research as it is published by communication journals, and examines how culture is conceptualized in intercultural communication research. Alternate ways in which

Dreama G. Moon

1996-01-01

193

The Need for Research on Mobile Technologies for  

E-print Network

about mobile technology for people with vision impairments. Almost all of this work has focusedThe Need for Research on Mobile Technologies for People with Low-Vision Abstract We argue that there needs to be more research on technologies for people with low-vision. While the vast majority of people

Wobbrock, Jacob O.

194

Developing a Conceptual Unmanned Aerial Vehicle Communications Mobile AD Hoc Network Simulation Model.  

National Technical Information Service (NTIS)

A growing demand for increased networking interoperability has spawned a requirement for ad hoc networking. One proposal to satisfy the need is development of Unmanned Aerial Vehicle (UAV) communications Mobile Ad Hoc Networks (NANET) . In order to establ...

H. L. Blackshear

2002-01-01

195

Activity Analysis Enabling Real-Time Video Communication on Mobile Phones for Deaf Users  

E-print Network

breakdowns, but does not affect the users' perception of adopting the technol- ogy. These results show language video communication on off-the-shelf mobile phones between users that wear no special clothing

Anderson, Richard

196

76 FR 30154 - Maritime Communications/Land Mobile, LLC, Licensee of Various Authorizations in the Wireless...  

Federal Register 2010, 2011, 2012, 2013

...officer and a director of the company. See Maritime Communications/Land Mobile...having an interest in the company. Maritime did not disclose any involvement...characterized as his wife's company than Maritime led the Commission to...

2011-05-24

197

Children's Literature in the Undergraduate Course on Communication Research Methods  

ERIC Educational Resources Information Center

Objective: Students will develop positive attitudes toward communication research by linking new values and principles with the familiar values and principles contained in children's literature. Course: Communication Research Methods.

Brown, Daniel S.

2010-01-01

198

A unified approach tothe performance analysis of speed estimation techniques in mobile communication  

Microsoft Academic Search

Estimation of the mobile speed, or equivalently, the maximum Doppler frequency, is of importance in a variety of applications in wireless mobile communications. In this paper, a unified framework for the performance analysis of several major speed estimation techniques is presented, which allows a fair comparison between all the methods, analytically. Interestingly, it is proved that all these methods are

Ali Abdi; Hong Zhang; Cihan Tepedelenlioglu

2008-01-01

199

A Reliable Connection Migration Mechanism for Synchronous Transient Communication in Mobile Codes  

E-print Network

. A special form of migration is mobile agent that has as its defining trait the ability to travelA Reliable Connection Migration Mechanism for Synchronous Transient Communication in Mobile Codes during their migration. This mechanism supports concurrent migration of both endpoints of a connection

Xu, Cheng-Zhong

200

WIRELESS COMMUNICATIONS AND MOBILE COMPUTING Wirel. Commun. Mob. Comput. 2005; 5:825845  

E-print Network

National University of Education, San 7-1, Darakri, Chongwon- Gun, Chungbuk, 363-791, Korea Summary MobileWIRELESS COMMUNICATIONS AND MOBILE COMPUTING Wirel. Commun. Mob. Comput. 2005; 5:825­845 Published Science, University of Oklahoma, Norman, OK 73019-6151, U.S.A. 2 Department of Technology Education, Korea

Atiquzzaman, Mohammed

201

The design of a linear L-band high power amplifier for mobile communication satellites  

NASA Technical Reports Server (NTRS)

A linear L-band solid state high power amplifier designed for the space segment of the Mobile Satellite (MSAT) mobile communication system is described. The amplifier is capable of producing 35 watts of RF power with multitone signal at an efficiency of 25 percent and with intermodulation products better than 16 dB below carrier.

Whittaker, N.; Brassard, G.; Li, E.; Goux, P.

1990-01-01

202

Sales Communications in a Mobile World: Using the Latest Technology and Retaining the Personal Touch  

ERIC Educational Resources Information Center

Salespeople increasingly have the opportunity to use technology to more quickly communicate with a larger number of clients and customers. Mobile technology, in particular, gives salespeople many advantages in rapidly reaching a large customer base. Furthermore, customers are increasingly employing mobile technology, making them increasingly…

Norris, Daniel T.

2007-01-01

203

Guidelines for the Use of Mobile Computing and Communications Devices in Classes at McGill  

E-print Network

as not disruptive1 3. Not allowed at all. , and; 1. Allowed under specified conditions Mobile computing and contribute to ensuring individual and collective good classroom experiences.); b. When "No technology time.g., guest speaker. 2. Allowed as long as not disruptive Mobile computing and communications devices

Barthelat, Francois

204

Improving the Communication of Spatial Information in Crisis Response by Combining Paper Maps and Mobile Devices  

Microsoft Academic Search

Ecient and eective communication between mobile units and the central emergency operation center is a key factor to respond successfully to the challenges of emergency management. Nowadays, the only ubiquitously available modality is a voice channel through mobile phones or radio transceivers. This makes it often very dicult to convey exact geographic locations and can lead to misconceptions with severe

Johannes Schoning; Michael Rohs; Antonio Kruger; Christoph Stasch

205

Rendering Adaptation to Address Communication and Computation Constraints in Cloud Mobile Gaming  

E-print Network

Rendering Adaptation to Address Communication and Computation Constraints in Cloud Mobile Gaming by the available server computing resource for each client, considering cloud server hosts numerous clients Shaoxuan Wang, Sujit Dey Mobile System Design Lab, Dept. of Electrical and Computer Engineering University

California at San Diego, University of

206

Phased Arrays of Ground and Airborne Mobile Terminals for Satellite Communications  

NASA Technical Reports Server (NTRS)

Phased array antenna is beginning to play an important in the arena of mobile/satellite communications. Two examples of mobile terminal phased arrays will be shown. Their technical background, challenges, and cost drivers will be discussed. A possible solution to combat some of the deficiencies of the conventional phased array by exploiting the phased reflectarray technology will be briefly presented.

Huang, John

1996-01-01

207

Structured P2P overlay of mobile brokers for realizing publish/subscribe communication in VANET.  

PubMed

Publish/subscribe communication paradigm provides asynchrony and decoupling, making it an elegant alternative for designing applications in distributed and dynamic environment such as vehicular ad hoc networks (VANETs). In this paradigm, the broker is the most important component that decouples other two components, namely, publisher and subscriber. Previous research efforts have either utilized the deployment of distributed brokers on stationary road side info-stations or have assigned the role of broker to any moving vehicle on ad hoc basis. In one approach, lots of preinstalled infrastructures are needed whereas, in another, the quality of service is not guaranteed due to unpredictable moving and stopping patterns of vehicles. In this paper, we present the architecture of distributed mobile brokers which are dynamically reconfigurable in the form of structured P2P overlay and act as rendezvous points for matching publications and subscriptions. We have taken city buses in urban settings to act as mobile brokers whereas other vehicles are considered to be in role of publishers and subscribers. These mobile brokers also assist in locating a vehicle for successful and timely transfer of notifications. We have performed an extensive simulation study to compare our approach with previously proposed approaches. Simulation results establish the applicability of our approach. PMID:24523629

Pandey, Tulika; Garg, Deepak; Gore, Manoj Madhava

2014-01-01

208

From Windscreen to Widescreen: Screening Technologies and Mobile Communication  

Microsoft Academic Search

This article suggests that studies of mobile media need to be more attentive to the history of screening technologies. The development of screening technologies is examined by identifying six characteristics—storage and access, interactivity, mobility, control, informationalization, and convergence\\/translation—through the context of automobility. A brief history of the informationalization of driving, mobile entertainment in the car, and networked automobiles is used

Jeremy Packer; Kathleen F. Oswald

2010-01-01

209

Split-proxy concept for application layer handover in mobile communication systems  

Microsoft Academic Search

This paper presents an HTTP based approach for handover within and between heterogeneous communication systems. Therefore a Split-Proxy-Concept has been developed, consisting of client- and server side proxies. Communication between proxies takes place using TCP connections, thus benefiting from existing IP mobility approaches and virtual serial connections as provided by Bluetooth or circuit switched access. The latter allows to forgo

Jens Kammann; Tim Blachnitzky

2002-01-01

210

Using mobile communication technology in high school education: Motivation, pressure, and learning performance  

Microsoft Academic Search

Motivation and pressure are considered two factors impacting vocational senior high school student learning. New communication technology, especially mobile communication technology, is supposed to be effective in encouraging inter- action between the student and the instructor and improving learning efficiency. Social presence and information richness theory was applied to analyze the media and their impacts on the instruction process firstly.

Pei-luen Patrick Rau; Qin Gao; Li-mei Wu

2008-01-01

211

Proposition of a communication system used in mobility by users with physical disabilities, focus on  

E-print Network

on cerebral palsy with athetoid problems Yohan Guerrier, Christophe Kolski Univ Lille Nord de France, F-59000 system of communication for people with cerebral palsy (CP) with athetoid problems. These people have; mobility; Disabled user; Cerebral palsy (CP); Slurred speech; Communication support I. INTRODUCTION

Paris-Sud XI, Université de

212

An implementation of a CMA adaptive array for high speed GMSK transmission in mobile communications  

Microsoft Academic Search

The hardware implementation of an adaptive array as a technique for compensating multipath fading in mobile communications is described. The number of the antenna elements is four. The target communication system is modulated by 256 kbps Gaussian-filtered minimum shift keying (MSK) and has a time-division multiplexing (TDM) architecture with 24 time slots. Based on the digital beamforming concept, all of

Takeo Ohgane; Takanori Shimura; Naoto Matsuzawa; Hideichi Sasaoka

1993-01-01

213

Using Mobile Communication Technology in High School Education: Motivation, Pressure, and Learning Performance  

ERIC Educational Resources Information Center

Motivation and pressure are considered two factors impacting vocational senior high school student learning. New communication technology, especially mobile communication technology, is supposed to be effective in encouraging interaction between the student and the instructor and improving learning efficiency. Social presence and information…

Rau, Pei-Luen Patrick; Gao, Qin; Wu, Li-Mei

2008-01-01

214

Using mobile devices to support communication between emergency medical responders and deaf people  

Microsoft Academic Search

Fast and effective communication is crucial during medical emergencies, but patients' disabilities can make it a challenging task for emergency medical responders. This paper proposes a mobile system to deal with the communication barrier between medical responders and deaf patients. The system allows medical responders to quickly browse a collection of emergency-related sentences, and show videos of the corresponding translations

Fabio Buttussi; Luca Chittaro; Elio Carchietti; Marco Coppo

2010-01-01

215

Laser Communication Demonstration System (LSCS) and Future Mobile Satellite Services  

NASA Technical Reports Server (NTRS)

The Laser Communications Demonstration System (LCDS) is a proposed in-orbit demonstration of high data rate laser communications technology conceived jointly by NASA and U.S. industry. The program objectives are to stimulate industry development and to demonstrate the readiness of high data rate optical communications in Earth Orbit. For future global satellite communication systems using intersatellite links (ISLs), laser communications technology can offer reduced mass , reduced power requirements, and increased channel bandwidths without regulatory restraint. This paper provides comparisons with radio systems and status of the program.

Chen, C. -C.; Lesh, J. R.

1995-01-01

216

Mobile Communications for Medical Care a study of current and future healthcare and health promotion applications, and  

E-print Network

Mobile Communications for Medical Care a study of current and future healthcare and health examines the use of mobile networks to enhance healthcare (so-called "mHealth"), as an example of how mobile communications can contribute to sustainable development. We define mHealth as "a service

Talbot, James P.

217

Communication protocols and on-board processor for a new national scale private mobile radio service [medical information environment  

Microsoft Academic Search

A satellite-aided mobile radio communication service opens a new horizon of the integrated medical information environment. Doctors of medicine working on fixed or mobile stations, located in remote geographical areas, are able to communicate\\/cooperate each other by exchanging, handling and processing medical data simultaneously. The authors present a new national scale private mobile radio service using satellite facilities. This new

S. Kotsopoulos; D. Lymberopoulos

1992-01-01

218

Discovery and Integration of Mobile Communications in Everyday Life  

Microsoft Academic Search

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

Leysia Palen; Marilyn C. Salzman; Ed Youngs

2001-01-01

219

Secure Positioning of Mobile Terminals with Simplex Radio Communication  

E-print Network

trusted stations. Our proposal has a major advantage in protecting the location privacy of mobile terminal mobile­phones, PDAs, handheld gaming devices, non­contact IC cards, RFID tags, and GPS receivers, the most popular wireless positioning sys­ tem is perhaps the civilian GPS service, which is orig­ inally

220

Secure Positioning of Mobile Terminals with Simplex Radio Communication  

E-print Network

trusted stations. Our proposal has a major advantage in protecting the location privacy of mobile terminal mobile-phones, PDAs, handheld gaming devices, non-contact IC cards, RFID tags, and GPS receivers, the most popular wireless positioning sys- tem is perhaps the civilian GPS service, which is orig- inally

221

Secure Mobile IP Communication Torsten Braun and Marc Danzeisen  

E-print Network

the paper. 5HODWHG :RUN Zao and Condell discuss the use of IPSec over Mobile IP for HA-MN, HA-FA, CN-HA, CN]. IPSec is used to replace IP-IP-tunneling. Adaptations to Mobile IP messages are proposed for coping with IPSec tunnel establishment. Special IPSec tunnel extensions are added to advertisements and registration

Braun, Torsten

222

Challenging Mobile Learning Discourse through Research: Student Perceptions of "Blackboard Mobile Learn" and "iPads"  

ERIC Educational Resources Information Center

Many university academics disagree with the rationale that we should pursue mobile learning because 21st century students are apparently demanding it. We argue that the only defensible rationale for making mobile learning part of pedagogy is because it enhances student learning. This presentation shares results from research with 135 students…

Kinash, Shelley; Brand, Jeffrey; Mathew, Trishita

2012-01-01

223

Research and implementation of network collaborative transmission model in mobile GIS  

Microsoft Academic Search

Due to most Mobile GIS adopts request-response pattern to communicate between server and mobile terminals, and that mobile terminals are isolated from one another, so it leads to be lack of collaboration and data sharing capabilities among mobile terminals in Mobile GIS. In view of this, a network collaborative transmission model which combines central server with P2P (Peer to Peer)

Wu Dong; Wang Qing; Bi Liang

2010-01-01

224

Quality of experience of voice communication in large-scale mobile ad hoc networks  

Microsoft Academic Search

Real-time voice communication is an essential requirement in first responder scenarios. While mobile ad hoc networks (MANET) already prove to be an appropriate communication substrate in small-scale real-world operations, questions regarding scalability limitations remain. In this paper, we identify major factors that affect the quality of experience of voice communication in MANETs. In a series of simulation studies, we show

Christian Gottron; A. Konig; M. Hollick; S. Bergstrasser; T. Hildebrandt; R. Steinmetz

2009-01-01

225

A Mobile Robots Experimental Environment with Event-Based Wireless Communication  

PubMed Central

An experimental platform to communicate between a set of mobile robots through a wireless network has been developed. The mobile robots get their position through a camera which performs as sensor. The video images are processed in a PC and a Waspmote card sends the corresponding position to each robot using the ZigBee standard. A distributed control algorithm based on event-triggered communications has been designed and implemented to bring the robots into the desired formation. Each robot communicates to its neighbors only at event times. Furthermore, a simulation tool has been developed to design and perform experiments with the system. An example of usage is presented. PMID:23881139

Guinaldo, Maria; Fabregas, Ernesto; Farias, Gonzalo; Dormido-Canto, Sebastian; Chaos, Dictino; Sanchez, Jose; Dormido, Sebastian

2013-01-01

226

A mobile robots experimental environment with event-based wireless communication.  

PubMed

An experimental platform to communicate between a set of mobile robots through a wireless network has been developed. The mobile robots get their position through a camera which performs as sensor. The video images are processed in a PC and a Waspmote card sends the corresponding position to each robot using the ZigBee standard. A distributed control algorithm based on event-triggered communications has been designed and implemented to bring the robots into the desired formation. Each robot communicates to its neighbors only at event times. Furthermore, a simulation tool has been developed to design and perform experiments with the system. An example of usage is presented. PMID:23881139

Guinaldo, María; Fábregas, Ernesto; Farias, Gonzalo; Dormido-Canto, Sebastián; Chaos, Dictino; Sánchez, José; Dormido, Sebastián

2013-01-01

227

Prospects for Technical Communication: Research for Futures Needs.  

ERIC Educational Resources Information Center

The need for technical communication to enable the transition from a "postindustrial" future to an alternative future is incalculable; however, research is required to improve current technical communication models and methods. The current rhetoric of technical communication derives from an inadequate command-generated technical communication

Mathes, J. C.

228

Mobile databases: a selection of open issues and research directions  

Microsoft Academic Search

This paper reports on the main results of a specific action on mobile databases conducted by CNRS in France from October 2001 to December 2002. The objective of this action was to review the state of progress in mobile databases and identify major research directions for the French database community. Rather than provide a survey of all important issues in

Guy Bernard; Jalel Ben-othman; Luc Bouganim; Gérôme Canals; Sophie Chabridon; Bruno Defude; Jean Ferrié; Stéphane Gançarski; Rachid Guerraoui; Pascal Molli; Philippe Pucheral; Claudia Roncancio; Patricia Serrano-Alvarado; Patrick Valduriez

2004-01-01

229

TDMA-Based Dual-Mode Communication for Mobile Wireless Sensor Networks  

PubMed Central

Small highly mobile robots, and in particular micro air vehicles (MAVs), are well suited to the task of exploring unknown indoor environments such as buildings and caves. Such a task imposes a number of requirements on the underlying communication infrastructure, with differing goals during various stages of the mission. This work addresses those requirements with a hybrid communications infrastructure consisting of a stationary mesh network along with the mobile nodes. The combined network operates in two independent modes, coupling a highly efficient, low duty cycle, low throughput mode for routing and persistent sensing with a burst mode for high data rate communication. By strategically distributing available frequency channels between the mobile agents and the stationary nodes, the overall network provides reliable long-term communication paths while maximizing data throughput when needed. PMID:23443374

Mehta, Ankur; Kerkez, Branko; Glaser, Steven D.; Pister, Kristofer S. J.

2012-01-01

230

Research In Mobile Context-aware Applications  

Microsoft Academic Search

GUIDE The GUIDE system (2,3) integrates the use of personal computing technologies, wireless communications, context-awareness and adaptive hypermedia in order to support the information and navigation needs of visitors to the city of Lancaster. In more detail, GUIDE utilizes a cell-based wireless communications infrastructure to broadcast dynamic information and positioning information to portable GUIDE units that run a customized web-browser.

Keith Cheverst

231

Need for, and financial feasibility of, satellite-aided land mobile communications  

NASA Technical Reports Server (NTRS)

Questions regarding the role of a mobile-satellite system in augmenting the terrestrial communications system are considered, and a market assessment study is discussed. Aspects of an investment analysis are examined, taking into account a three phase financial study of four postulated land Mobile Satellite Service (LMSS) systems, project profitability evaluation methods, risk analysis methods, financial projections, potential investor acceptance standards, and a risk analysis. It is concluded that a satellite augmented terrestrial mobile service appears to be economically and technically superior to a service depending exclusively on terrestrial systems. The interest in the Mobile Satellite Service is found to be worldwide, and the ground equipment market is potentially large.

Castruccio, P. A.; Marantz, C. S.; Freibaum, J.

1982-01-01

232

International Research Network in European Political Communications  

NSDL National Science Digital Library

EurPolCom was initially established in 2000, by Professor Paul Statham, and located at the University of Leeds. In 2007, it was re-launched as a 'network' which advances research in the fields of political communications, the public sphere and social movements and is now located at the University of Bristol. On their website visitors can learn more about this organization and their various research projects. In addition, there are a number of working papers available to the public including "Constitutionalism of the European Public Sphere" and "The Politics of Immigration and Asylum Policy in Western Europe" to name only a few. After getting acquainted, visitors may want to learn more about their grants and awards available as well as upcoming events. Lastly, a set of related links is provided for those interested in a specific aspect of the site.

233

Research in Corporate Communication: An Overview of an Emerging Field.  

ERIC Educational Resources Information Center

Provides an overview of research in corporate communication, focusing on achievements found in the international academic literature in both communication and business school disciplines. Gives three key concepts in such research: corporate identity, corporate reputation, and orchestration of communication. Advocates an interdisciplinary approach…

van Riel, Cees B. M.

1997-01-01

234

Stratus: energy-efficient mobile communication using cloud support  

Microsoft Academic Search

Cellular radio communication is a significant contributor to battery energy drain on smartphones, in some cases inflating the energy cost by a factor of 5 or more compared to the energy cost of the base device. Stratus is a system to reduce this energy consumption by leveraging cloud resources to make data communication on smartphones more efficient. Using a cloud-based

Bhavish Aggarwal; Pushkar Chitnis; Amit Dey; Kamal Jain; Vishnu Navda; Venkata N. Padmanabhan; Ramachandran Ramjee; Aaron Schulman; Neil Spring

2011-01-01

235

Stratus: energy-efficient mobile communication using cloud support  

Microsoft Academic Search

Cellular radio communication is a significant contributor to battery energy drain on smartphones, in some cases inflating the energy cost by a factor of 5 or more compared to the energy cost of the base device. Stratus is a system to reduce this energy consumption by leveraging cloud resources to make data communication on smartphones more efficient. Using a cloud-based

Bhavish Aggarwal; Pushkar Chitnis; Amit Dey; Kamal Jain; Vishnu Navda; Venkata N. Padmanabhan; Ramachandran Ramjee; Aaron Schulman; Neil Spring

2010-01-01

236

[Pilot plan for a mobile health communication and monitoring system for people with diabetes].  

PubMed

mHealth is a practical, useful, and available tool for one-way or two-way communication between health professionals and patients. It is especially promising in countries such as Chile, with widespread and growing mobile telephone coverage that is very well accepted by the public. Our objective is to demonstrate the process for designing a mobile communication and monitoring model, aimed at providing communication between professionals in primary healthcare centers and their patients, to facilitate timely diagnosis and initiation of treatment for type 2 diabetes. This model's characteristics include use of mobile telephones as a communication tool, a one-way method (from health centers to patients), integration into in-person care delivered at health centers, use of different communication strategies (voice and written), and integrated functioning using open-source software. The system includes personalized communication, automated voice communication, and automated written communication using short message service (SMS). We describe the strategies and components of the system. The lessons learned include the contribution from successful implementation of COSMOS (consolidated online modulated operating systems), a technological innovation, to support the health care of people with suspected type 2 diabetes in primary healthcare centers. Working together with teams in the field is essential to this achievement. PMID:25211577

Alcayaga, Claudia; Pérez, Janet Carola; Bustamante, Claudia; Campos, Solange; Lange, Ilta; Zuñiga, Francisca

2014-01-01

237

Laser Communication Demonstration System (LCDS) and future mobile satellite services  

NASA Technical Reports Server (NTRS)

The Laser Communications Demonstration System (LCDS) is a proposed in-orbit demonstration of high data rate laser communications technology conceived jointly by NASA and U.S. industry. The program objectives are to stimulate industry development and to demonstrate the readiness of high data rate optical communications in Earth orbit. For future global satellite communication systems using intersatellite links, laser communications technology can offer reduced mass and power requirements and higher channel bandwidths without regulatory constraints. As currently envisioned, LCDS will consist of one or two orbiting laser communications terminals capable of demonstrating high data rate (greater than 750Mbps) transmission in a dynamic space environment. Two study teams led by Motorola and Ball Aerospace are currently in the process of conducting a Phase A/B mission definition study of LCDS under contracts with JPL/NASA. The studies consist of future application survey, concept and requirements definition, and a point design of the laser communications flight demonstration. It is planned that a single demonstration system will be developed based on the study results. The Phase A/B study is expected to be completed by the coming June, and the current results of the study are presented in this paper.

Chen, Chien-Chung; Wilhelm, Michael D.; Lesh, James R.

1995-01-01

238

Utilizing Mobility to Minimize the Total Communication and Motion Energy  

E-print Network

the motion decision of the robot. Our simulation results show that, by using our strategy, the robot can in the communications/networking and robotics literature Goldsmith and Chua (1997); Mei et al. (2004), co

Mostofi, Yasamin

239

Autonomous interactive intermediaries : social intelligence for mobile communication agents  

E-print Network

Today's cellphones are passive communication portals. They are neither aware of our conversational settings, nor of the relationship between caller and callee, and often interrupt us at inappropriate times. This thesis is ...

Marti, Stefan Johannes Walter, 1965-

2005-01-01

240

Adaptive Transceivers for Mobile Free-Space Optical Communications  

Microsoft Academic Search

Free-space optical (FSO) communication links are susceptible to a tremendous amount of variability and offer a real challenge for efficient, robust system design. Whether changes in link margin are predictable (i.e. weather conditions or mission profiles) or truly random (i.e. atmospheric turbulence induced scintillation or boundary layer induced tracking errors), FSO communication systems will experience a large dynamic range of

Jeffrey R. Minch; David R. Gervais; Daniel J. Townsend

2006-01-01

241

47th Annual Communicating Nursing Research Conference  

E-print Network

of Communications and Marketing Tools, Tips, Tweets, and Talking Points: Communicating the Impact of Nursing Take.S.W. Doctoral student Presentation: Adverse Event Exposure and Resilience in Early Childhood Robin Whitney, R

Schladow, S. Geoffrey

242

Business Communication Consulting and Research in Multinational Companies.  

ERIC Educational Resources Information Center

Describes three issues involved in communication research and consulting for multinational companies, particularly those in Germany: qualifications for doing international consulting and research, problems of American scholar-researchers in those firms, and suggestions for dealing with those issues. (JMF)

Hildebrandt, Herbert W.

1978-01-01

243

An operational open-end file transfer protocol for mobile satellite communications  

NASA Technical Reports Server (NTRS)

This paper describes an operational open-end file transfer protocol which includes the connecting procedure, data transfer, and relinquishment procedure for mobile satellite communications. The protocol makes use of the frame level and packet level formats of the X.25 standard for the data link layer and network layer, respectively. The structure of a testbed for experimental simulation of this protocol over a mobile fading channel is also introduced.

Wang, Charles; Cheng, Unjeng; Yan, Tsun-Yee

1988-01-01

244

Elevation Dependent Shadowing Model for Mobile Communications via High Altitude Platforms in Built-Up Areas  

Microsoft Academic Search

An empirical propagation prediction model is described for mobile communications from high altitude platforms (HAPs) in different types of built-up areas. The model introduced here is defined as a function of the angle of elevation. The target frequencies are selected from the 2 to 6 GHz frequency band prospective for 3G and 4G mobile systems, namely at 2.0,3.5, and 5.5

Jaroslav Holis; Pavel Pechac

2008-01-01

245

Improving the Communication of Spatial Information in Crisis Response by Combining Paper Maps and Mobile Devices  

Microsoft Academic Search

Efficient and effective communication between mobile units and the central emergency operation center is a key factor to respond\\u000a successfully to the challenges of emergency management. Nowadays, the only ubiquitously available modality is a voice channel\\u000a through mobile phones or radio transceivers. This makes it often very difficult to convey exact geographic locations and can\\u000a lead to misconceptions with severe

Johannes Schöning; Michael Rohs; Antonio Krüger; Christoph Stasch

2008-01-01

246

Organizational Communication: Research and Practice. ERIC Digest.  

ERIC Educational Resources Information Center

In colleges and universities business students learn about organizational communication in order to function well in the business environment of which they will become a part. Although the organizational environment or culture is inextricably interwoven with the academic discipline of speech communication, the field of organizational communication

Aiex, Nola Kortner

247

Research and implementation of multimedia communication systems  

Microsoft Academic Search

Because of the special nature of communications systems, designing and developing a simple and targeted multimedia communications platform is the focus of this work. The main features of the platform are applying the existing messaging middleware technology to the system in order to meet the messaging needs communication system, extending the message middleware, adding configurable signaling and encryption Function, providing

Yang Xi; Xue Fei

2011-01-01

248

Mobility-Tolerant Reliable Wireless LAN Multicast Communication  

Microsoft Academic Search

Reliable single-hop wireless multicast is needed for vario us applications such as multicast file transfer in a smart classroom. Mobility and wireless channel characteristics such as high bit error rate (BER) and the hidden terminal problem make providing reliability a challenging task. Further, due to the broadcast nature of the wireless medium, feedback packets such as acknowledgements and control packets

V. Shankar; S. K. S. Gupta

249

Diversity techniques for blind channel equalization in mobile communications  

Microsoft Academic Search

A blind algorithm for channel distortion compensation is presented which can be employed in spatial or temporal diversity receivers. The proposed technique can be used in frequency selective and frequency flat fading mobile channels, using burst transmission schemes in the first case and OFDM modulation in the second one. The algorithm is base on a deterministic criteria and is suited

Meritxell Lamarca; G. Vazquez

1997-01-01

250

Improving TCP performance in mobile satellite IP communications  

E-print Network

station or mobile entities to another earth station via artificial satellites Seamless, ubiquitous system: hypertext transfer protocol FTP: file transfer protocol BER: bit error rate #12;June 26, 2006 TMP 2006 issues of wasted bandwidth due to excessive spam (Nigeria, Nepal) #12;June 26, 2006 TMP 2006: Improving

Trajkovic, Ljiljana

251

Research on artificial meteor trail emergency communication  

NASA Astrophysics Data System (ADS)

As the particles known as meteors enter the earth's atmosphere, a small fraction of which can form ionized cloud, this ionized cloud has property useful for reflecting electromagnetic wave. Meteor burst communication is a point to point communication technology base on the above principle. Similarly, artificial meteor trail communication establishes “ionized cloud” signal channel by alkali metal ionizing at high-altitude ionosphere to reflect electromagnetic waves. Currently, Meteor burst communication is a mature communication technology with many advantages. However, as a completely uncontrollable natural phenomena, the communication time, duration time, the amount of information transmitted and antenna alignment direction are all uncontrollable. We can only figure out key parameters such as throughput and waiting time within a certain time relying on statistical regularities. Information transmission between specified sites in certain time is impossible to predict accurately. These disadvantages greatly reduce the dependability of meteor trail communication and cannot meet emergency communication’s requirements for real-time, controllable and uninterrupted. Artificial meteor trail emergency communication technology solves the above problems, it’s a reliable emergency telecommunication method. This paper focuses on the necessity and feasibility of artificial meteor trail emergency communication technology, as well as its future application.

Juntao, Liu; Xijun, Yan; Li, Jia

252

Communication/Placement Research Project: Communication Needs for Employment.  

ERIC Educational Resources Information Center

This report, undertaken to secure data to facilitate employment of Iowa State University graduates, summarizes information gathered from visits to 30 businesses and corporations in Iowa and Illinois. Comments address the following aspects of application and employment: additional studies required, general and communication skills, style of…

Feinberg, Lilian O.

253

Defining Moments in Risk Communication Research: 1996–2005  

Microsoft Academic Search

Ten years ago, scholars suggested that risk communication was embarking on a new phase that would give increased attention to the social contexts that surround and encroach on public responses to risk information. A decade later, many researchers have answered the call, with several defining studies examining the social and psychological influences on risk communication. This article reviews risk communication

Katherine A. McComas

2006-01-01

254

The Theory, Research, and Practice of Communication in Spain.  

ERIC Educational Resources Information Center

This paper discusses the theory, research, and practice of communication in Spain, from the perspective of language, political economy, and culture. The peoples of the Iberian Peninsula and surrounding islands communicate in a rich variety of languages. In the electronic age, communication has shifted away from the print media to the spoken media,…

Oseguera, A. Anthony

255

Mobility Matters: Research Training and Network Building in Science  

Microsoft Academic Search

Technology transfer and human-capital mobility are integral to processes of capacity building that lead to economic and social development. Scientific mobility through institutional channels is argued to be a process in which scientists and engineers can accumulate scientific capitals. This essay reviews the importance of foreign research degrees and postdoctoral positions in the formation of human-capital and social-capital networks. The

Tim Turpin Jane Marceau; Stephen Hill

2008-01-01

256

Mobile phones and brain tumours: a review of epidemiological research  

Microsoft Academic Search

There has been a great deal of public concern regarding the possibility that the use of mobile phone-related technologies\\u000a might result in adverse health effects. Corresponding to this, there has been substantial epidemiological research designed\\u000a to determine whether the use of mobile phones (MP) has any effect on health, and in particular whether it increases the risk\\u000a of developing head

R. J. Croft; R. J. McKenzie; I. Inyang; G. P. Benke; V. Anderson; M. J. Abramson

2008-01-01

257

The Mobile Agents Integrated Field Test: Mars Desert Research Station April 2003  

NASA Technical Reports Server (NTRS)

The Mobile Agents model-based, distributed architecture, which integrates diverse components in a system for lunar and planetary surface operations, was extensively tested in a two-week field "technology retreat" at the Mars Society s Desert Research Station (MDRS) during April 2003. More than twenty scientists and engineers from three NASA centers and two universities refined and tested the system through a series of incremental scenarios. Agent software, implemented in runtime Brahms, processed GPS, health data, and voice commands-monitoring, controlling and logging science data throughout simulated EVAs with two geologists. Predefined EVA plans, modified on the fly by voice command, enabled the Mobile Agents system to provide navigation and timing advice. Communications were maintained over five wireless nodes distributed over hills and into canyons for 5 km; data, including photographs and status was transmitted automatically to the desktop at mission control in Houston. This paper describes the system configurations, communication protocols, scenarios, and test results.

Clancey, William J.; Sierhuis, Maarten; Alena, Rick; Crawford, Sekou; Dowding, John; Graham, Jeff; Kaskiris, Charis; Tyree, Kim S.; vanHoof, Ron

2003-01-01

258

Securing against fraud in mobile communications : system design and development in 3G mobile networks  

E-print Network

Network security ensures the consistency, integrity, and reliability of telecommunications systems. Authorized network access prevents fraudulent communications and maintains the availability of the systems. However, limited ...

Mochizuki, Yujiro, 1973-

2006-01-01

259

Action Research Approach on Mobile Learning Design for the Underserved  

ERIC Educational Resources Information Center

This paper discusses an action research study focused on developing a mobile learning model of literacy development for underserved migrant indigenous children in Latin America. The research study incorporated a cyclical action model with four distinctive stages (Strategize, Apply, Evaluate, and Reflect) designed to guide constituencies involved…

Kim, Paul H.

2009-01-01

260

An experimental OFDM system for broadband mobile communications  

Microsoft Academic Search

We present an overview of an experimental 20 MHz 2×2 MIMO-OFDM system for operation at 3.65 GHz. The transmitted signal characteristics, data collection setup, measurement analysis, and timing acquisition algorithms are described. Field trials from a base station with two transmit antennas to a two-antenna mobile receiver are planned in a coverage area having a two mile radius. The first

Mickael D. Batariere; James F. Kepler; Thomas P. Krauss; Sandeep Mukthavaram; Jeffrey W. Porter; Frederick W. Vook

2001-01-01

261

Mobile communication higher-order-mode microstrip antennas for VICS  

Microsoft Academic Search

The Vehicle Information and Communication System (VICS) is one of the intelligent transport systems (ITS) in Japan. The system commenced in the Tokyo area and Tohmei and Meishin highways in 1996. VICS consists of a radio beacon system, a light beacon system and an FM broadcasting system. The radio beacon system antennas installed on cars are desired to have the

Y. Kazama; N. Morita; S. Tokumaru

1998-01-01

262

A Mobile Ad-Hoc Network Data Communication Benchmark Leslie D. Fife  

E-print Network

protocols proposed is the lack of a standard test environment or benchmark. A MANET data communication and demonstrates the benchmark through analysis and simulation of the TriM MANET data communication protocol. While conducting research in MANET data communication, it became apparent that a standard benchmark

Gruenwald, Le

263

Study of LEO-SAT microwave link for broad-band mobile satellite communication system  

NASA Technical Reports Server (NTRS)

In the field of mobile satellite communications, a system based on low-earth-orbit satellites (LEO-SAT's) such as the Iridium system has been proposed. The LEO-SAT system is able to offer mobile telecommunication services in high-latitude areas. Rain degradation, fading and shadowing are also expected to be decreased when the system is operated at a high elevation angle. Furthermore, the propagation delay generated in the LEO-SAT system is less pronounced than that in the geostationary orbit satellite (GEO-SAT) system and, in voice services, the effect of the delay is almost negligible. We proposed a concept of a broad-band mobile satellite communication system with LEO-SAT's and Optical ISL. In that system, a fixed L-band (1.6/1.5 GHz) multibeam is used to offer narrow band service to the mobile terminals in the entire area covered by a LEO-SAT and steerable Ka-band (30/20 GHz) spot beams are used for the wide band service. In this paper, we present results of a study of LEO-SAT microwave link between a satellite and a mobile terminal for a broad-band mobile satellite communication system. First, the results of link budget calculations are presented and the antennas mounted on satellites are shown. For a future mobile antenna technology, we also show digital beamforming (DBF) techniques. DBF, together with modulation and/or demodulation, is becoming a key technique for mobile antennas with advanced functions such as antenna pattern calibration, correction, and radio interference suppression. In this paper, efficient DBF techniques for transmitting and receiving are presented. Furthermore, an adaptive array antenna system suitable for this LEO-SAT is presented.

Fujise, Masayuki; Chujo, Wataru; Chiba, Isamu; Furuhama, Yoji; Kawabata, Kazuaki; Konishi, Yoshihiko

1993-01-01

264

RESOLUTION: Reconfigurable Systems for Mobile Local Communication and Positioning  

Microsoft Academic Search

RESOLUTION aims at developing a wireless three-dimensional (3-D) local positioning system with measurement accuracy in the centimetre regime and real-time ability. A novel frequency modulated continuous wave (FMCW) radar principle with pulsed active reflector is employed. This High-Precision-Localisation-System (HPLS) will be implemented together with common WLAN systems that are used for data communication purposes. Due to its high data rate

Philippos Tragas; Antonis Kalis; Constantinos Papadias; Frank Ellinger; Ralf Eickhoff; Thomas Ussmuller; Ralf Mosshammer; Mario Huemer; Alexander Dabek; Dimosthenes Doumenis; Anastassios Kounoudes

2007-01-01

265

An adaptive array antenna for mobile satellite communications  

NASA Technical Reports Server (NTRS)

The design of an adaptive array antenna for land vehicle operation and its performance in an operational satellite system is described. Linear and circularly polarized antenna designs are presented. The acquisition and tracking operation of a satellite is described and the effect on the communications signal is discussed. A number of system requirements are examined that have a major impact on the antenna design. The results of environmental, power handling, and RFI testing are presented and potential problems are identified.

Milne, Robert

1990-01-01

266

Failure restoration of mobility databases for personal communication networks  

Microsoft Academic Search

This paper studies failure restoration of mobilitydatabases for personal communication networks(specifically, VLRs and HLRs). We model the VLRrestoration with and without checkpointing. The optimalVLR checkpointing interval is derived to balancethe checkpointing cost against the paging cost. Wealso model GSM periodic location updating (locationconfirmation) to quantify the relationship between thelocation confirmation frequency and the number oflost calls.The HLR failure restoration...

Yi-bing Lin

1995-01-01

267

The Future Generations of Mobile Communications Based on Broadband Access Methods  

Microsoft Academic Search

The forthcoming mobile communication systems are expected to provide much variety of services from high quality voice to high definition videos through high data rate wireless channels at anywhere in the world. High data rate requires broad frequency bands, and sufficient broadband can be achieved in higher frequency bands such as microwave, Ka-band and millimeter-wave. Broadband wireless channels have to

Shingo Ohmori; Yasushi Yamao; Nobuo Nakajima

2001-01-01

268

Modeling of terrains for simulation of integrated mobile terrestrial and satellite communications systems  

Microsoft Academic Search

In this paper we present methods to generate models of mountainous regions. For these regions statistical methods are unsuitable to predict the service coverage, blocking and termination probabilities for systems involving fast moving satellites. We present methods using modeled terrains to analyze the service coverage in satellite integrated mobile communications systems. Results of service coverage analyses based on these methods

Gunar Schorcht; Ulrich Freund; Horst Salzwedel; Harald Keller

1996-01-01

269

An efficient communication strategy for mobile agent based distributed spatial data mining application  

NASA Astrophysics Data System (ADS)

An efficient communication strategy is proposed in this paper, which aims to improve the response time and availability of mobile agent based distributed spatial data mining applications. When dealing with decomposed complex data mining tasks or On-Line Analytical Processing (OLAP), mobile agents authorized by the specified user need to coordinate and cooperate with each other by employing given communication method to fulfill the subtasks delegated to them. Agent interactive behavior, e.g. messages passing, intermediate results exchanging and final results merging, must happen after the specified path is determined by executing given routing selection algorithm. Most of algorithms exploited currently run in time that grows approximately quadratic with the size of the input nodes where mobile agents migrate between. In order to gain enhanced communication performance by reducing the execution time of the decision algorithm, we propose an approach to reduce the number of nodes involved in the computation. In practice, hosts in the system are reorganized into groups in terms of the bandwidth between adjacent nodes. Then, we find an optimal node for each group with high bandwidth and powerful computing resources, which is managed by an agent dispatched by agent home node. With that, the communication pattern can be implemented at a higher level of abstraction and contribute to improving the overall performance of mobile agent based distributed spatial data mining applications.

Han, Guodong; Wang, Jiazhen

2005-11-01

270

WIRELESS COMMUNICATIONS AND MOBILE COMPUTING Wirel. Commun. Mob. Comput. 2011; 11:16281645  

E-print Network

WIRELESS COMMUNICATIONS AND MOBILE COMPUTING Wirel. Commun. Mob. Comput. 2011; 11 Kumar and Ahmed Kamal Department of Electrical and Computer Engineering, Iowa State University, Ames, IA. Fertilizer uptake and irrigation needs within a field depend on factors that vary in space and time

Kumar, Ratnesh

271

Eye Contact Communication System between Mobile Robots Using Invisible Code Display  

E-print Network

Eye Contact Communication System between Mobile Robots Using Invisible Code Display Takeru Furukawa on displays which show an expression of robot's eyes. Keywords: 2D code, polarized invisible code, polarized light control, LCD display 1 Introduction "The eyes are eloquent as the tongue." This proverb means

Paris-Sud XI, Université de

272

How Can Mobile SMS Communication Support and Enhance a First Year Undergraduate Learning Environment?  

ERIC Educational Resources Information Center

In this paper we discuss a case study investigating how the academic and personal development of first year students on an undergraduate sports education degree can be supported and enhanced with mobile SMS (Short Message Service) communication. SMS-based technologies were introduced in response to students' particular needs (in transition to…

Jones, Geraldine; Edwards, Gabriele; Reid, Alan

2009-01-01

273

Cross Layer Design for Mobile Ad-Hoc Unmanned Aerial Vehicle Communication Networks  

E-print Network

Cross Layer Design for Mobile Ad-Hoc Unmanned Aerial Vehicle Communication Networks Abdel Ilah of the Unmanned Aerial Vehicle (UAV) Ad-Hoc net- work, the layered architecture is not flexible enough to achieve for Unmanned Aerial Vehicle (IMAC UAV). As for the routing protocol, We developed the Optimized Link State

Dong, Liang

274

Power Saving with p-Persistent Sleep Decision for Ubiquitous Mobile Communications  

Microsoft Academic Search

Battery power is an important and limited resource in ubiquitous mobile communications. Energy consumption can be reduced by turning off the radio during idle times. In most power saving schemes, a node decides whether to put its wireless interfaces in the sleep state or in an awake state, based only on the presence of packets destined for the node. However,

Ji Wun Lee; Wha Sook Jeon; Dong Geun Jeong

2006-01-01

275

Development and performance of an L-band phased array antenna for mobile satellite communications  

Microsoft Academic Search

The previous years have witnessed an introduction of a large number of mobile satellite (MSS) communications systems. These include a global GEO MSS system, Inmarsat, and domestic GEO MSS systems such as North-American AMSC, Japan's N-Star and the Australian Mobilesat. At present, two types of antennas can be used to access GEO MSS services. They include (1) fixed position antennas,

N. C. Karmakar; M. E. Bialkowskilr

1999-01-01

276

WIRELESS COMMUNICATIONS AND MOBILE COMPUTING Wirel. Commun. Mob. Comput. 2009; 9:110  

E-print Network

Media and Communications, Seoul National University, Seoul, Republic of Korea Summary Inwirelessnetworks consumption should be minimized in order to prolong the battery lifetime of the mobile station (MS consumption. Copyright © 2009 John Wiley & Sons, Ltd. KEY WORDS: elastic traffic; throughput; energy saving

Bahk, Saewoong

277

New adaptive beamforming algorithms for smart antennas in DS-CDMA mobile communication systems  

Microsoft Academic Search

The increasing capacity and quality demands for mobile communication services, without a corresponding increase in RF spectrum allocation, motivate the need for new techniques to improve spectrum utilization. The CDMA and SDMA (spatial division multiple access) technologies are two solutions that show real promise for increasing spectrum efficiency. This work investigated smart antenna adaptive beamforming algorithms to implement and combine

Vu Dinh Thanh; Nguyen Le Hung

2004-01-01

278

MILCOM 2004-2004 IEEE MilitaryCommunications Conference ANONYMOUS HANDSHAKES IN MOBILE AD HOC NETWORKS  

E-print Network

MILCOM 2004- 2004 IEEE MilitaryCommunications Conference ANONYMOUS HANDSHAKES IN MOBILE AD HOC- vides the desirable sender and receiver anonymity, as well as the relationship anonymity of the sender the leakage of nodal identity informationl . This situation necessitates the development of anonymous com

Latchman, Haniph A.

279

A digital platform for marketing communications in the mobile and social media space  

E-print Network

A digital platform for marketing communications in the mobile and social media space Otto PetrovicPhone and Android, iPad apps, e-mail, RSS feeds and social media. All that channels are used and controlled from of all internet users already use social media regularly and time that is spent increases three times

Boyer, Edmond

280

Enhancing Motivation in Online Courses with Mobile Communication Tool Support: A Comparative Study  

ERIC Educational Resources Information Center

Mobile technologies have helped establish new channels of communication among learners and instructors, potentially providing greater access to course information, and promoting easier access to course activities and learner motivation in online learning environments. The paper compares motivation between groups of learners being taught through an…

Chaiprasurt, Chantorn; Esichaikul, Vatcharaporn

2013-01-01

281

Nonverbal Communication: A Research Guide & Bibliography.  

ERIC Educational Resources Information Center

This volume discusses various aspects of nonverbal communication and provides an extensive bibliography of journal articles, listed by author, that are relevant to the topic. Commentary is divided into six sections: "Considerations in Nonverbal Communication," which examines the impact of motion and rhythm, the components of nonverbal…

Key, Mary Ritchie

282

Design of an anti-Rician-fading modem for mobile satellite communication systems  

NASA Technical Reports Server (NTRS)

To design a demodulator applicable to mobile satellite communication systems using differential phase shift keying modulation, we have developed key technologies including an anti-Rician-fading demodulation scheme, an initial acquisition scheme, automatic gain control (AGC), automatic frequency control (AFC), and bit timing recovery (BTR). Using these technologies, we have developed one-chip digital signal processor (DSP) modem for mobile terminal, which is compact, of light weight, and of low power consumption. Results of performance test show that the developed DSP modem achieves good performance in terms of bit error ratio in mobile satellite communication environment, i.e., Rician fading channel. It is also shown that the initial acquisition scheme acquires received signal rapidly even if the carrier-to-noise power ratio (CNR) of the received signal is considerably low.

Kojima, Toshiharu; Ishizu, Fumio; Miyake, Makoto; Murakami, Keishi; Fujino, Tadashi

1995-01-01

283

Hirschmann Mobility Among Academics of Highly Ranked EU Research Universities  

Microsoft Academic Search

European universities have lost--and partially regained--key research academics to North American and other attractive university systems. EU efforts to reverse the cycle revolve around the establishment of an attractive European Research Area, within which future academic mobility--and commercial knowledge transmission--might be confined. This paper draws upon a survey of 1800 academics in 200 of Europe's most research-intensive universities to understand

Edward Bergman

2011-01-01

284

Communication: Charge, diffusion, and mobility of proteins through nanopores.  

PubMed

Implementation of Einstein's law connecting charge, diffusion coefficient, and mobility to interpret experimental data on proteins from single molecule electrophoresis through nanopores faces serious difficulties. The protein charge and diffusion coefficient, inferred with the Einstein law, can be orders of magnitude smaller than their bare values depending on the electrolyte concentration, pore diameter, chemical nature of the pore wall, and the externally applied voltage. The main contributors to the discrepancies are the coupled dynamics of the protein and its counterion cloud, confinement effects inside the pore, and the protein-pore-surface interaction. We have addressed these ingredients by harking on classical theories of electrophoresis of macroions and hydrodynamics inside pores, and deriving new results for pore-protein interactions. Putting together various components, we present approximate analytical formulas for the effective charge, diffusion coefficient, and mobility of a protein in the context of single molecule electrophoresis experiments. For the omnipresent pore-protein interactions, nonlinear dependence of the velocity of protein on voltage sets in readily and analytical formulas for this effect are presented. The derived formulas enable the determination of the bare charge and size of a protein from the experimentally measured apparent values. PMID:25172998

Muthukumar, M

2014-08-28

285

Communication: Charge, diffusion, and mobility of proteins through nanopores  

NASA Astrophysics Data System (ADS)

Implementation of Einstein's law connecting charge, diffusion coefficient, and mobility to interpret experimental data on proteins from single molecule electrophoresis through nanopores faces serious difficulties. The protein charge and diffusion coefficient, inferred with the Einstein law, can be orders of magnitude smaller than their bare values depending on the electrolyte concentration, pore diameter, chemical nature of the pore wall, and the externally applied voltage. The main contributors to the discrepancies are the coupled dynamics of the protein and its counterion cloud, confinement effects inside the pore, and the protein-pore-surface interaction. We have addressed these ingredients by harking on classical theories of electrophoresis of macroions and hydrodynamics inside pores, and deriving new results for pore-protein interactions. Putting together various components, we present approximate analytical formulas for the effective charge, diffusion coefficient, and mobility of a protein in the context of single molecule electrophoresis experiments. For the omnipresent pore-protein interactions, nonlinear dependence of the velocity of protein on voltage sets in readily and analytical formulas for this effect are presented. The derived formulas enable the determination of the bare charge and size of a protein from the experimentally measured apparent values.

Muthukumar, M.

2014-08-01

286

Communication: Charge, diffusion, and mobility of proteins through nanopores  

PubMed Central

Implementation of Einstein's law connecting charge, diffusion coefficient, and mobility to interpret experimental data on proteins from single molecule electrophoresis through nanopores faces serious difficulties. The protein charge and diffusion coefficient, inferred with the Einstein law, can be orders of magnitude smaller than their bare values depending on the electrolyte concentration, pore diameter, chemical nature of the pore wall, and the externally applied voltage. The main contributors to the discrepancies are the coupled dynamics of the protein and its counterion cloud, confinement effects inside the pore, and the protein-pore-surface interaction. We have addressed these ingredients by harking on classical theories of electrophoresis of macroions and hydrodynamics inside pores, and deriving new results for pore-protein interactions. Putting together various components, we present approximate analytical formulas for the effective charge, diffusion coefficient, and mobility of a protein in the context of single molecule electrophoresis experiments. For the omnipresent pore-protein interactions, nonlinear dependence of the velocity of protein on voltage sets in readily and analytical formulas for this effect are presented. The derived formulas enable the determination of the bare charge and size of a protein from the experimentally measured apparent values. PMID:25172998

Muthukumar, M.

2014-01-01

287

14.33 Economics Research and Communication, Spring 2002  

E-print Network

Designed to expose students to the process of conducting independent research in empirical economics and effectively communicating the results of the research. Begins with an econometric analysis of an assigned economic ...

Ellison, Sara Fisher

288

Communicating Responsibly with the Public: Researcher as Edifier.  

ERIC Educational Resources Information Center

Discusses the problem of communicating the implications of research findings to the public without distorting, diluting, or sensationalizing. Suggests approaches researchers can take when dealing with the popular media. (MS)

Cialdini, Robert B.

1988-01-01

289

A Research Design for Studying Communication Climate Within a Organization  

Microsoft Academic Search

Although difficult to assess, communication climate is a variable of much interest to researchers of organizational behavior. The present article describes a unique research design which was successfully implemented in a large telecommunication organization to evaluate the factors most influ ential in affecting communication climate as related to organizational behavior. Discussion focuses on the general applicability and specific advantages o

Susan Kogler Hill; Peter G. Northouse

1978-01-01

290

Shared Communications: Volume 2. In-Depth Systems Research  

SciTech Connect

This report is the second of two documents that examine the literature for actual examples of organizations and agencies that share communications resources. While the primary emphasis is on rural, intelligent transportation system (ITS) communications involving transit, examples will not be limited to rural activities, nor to ITS implementation, nor even to transit. In addition, the term ''communication'' will be broadly applied to include all information resources. The first document of this series, ''Shared Communications: Volume I. A Summary and Literature Review'', defines the meaning of the term ''shared communication resources'' and provides many examples of agencies that share resources. This document, ''Shared Communications: Volume II. In-Depth Systems Research'', reviews attributes that contributed to successful applications of the sharing communication resources concept. A few examples of each type of communication sharing are provided. Based on the issues and best practice realworld examples, recommendations for potential usage and recommended approaches for field operational tests are provided.

Truett, LF

2004-09-22

291

Performance analysis of replication ALOHA for fading mobile communications channels  

NASA Technical Reports Server (NTRS)

This paper describes an ALOHA random access protocol for fading communications channels. A two-state Markov model is used for the channel error process to account for the channel fading memory. The ALOHA protocol is modified to send multiple contiguous copies of a message at each transmission attempt. Both pure and slotted ALOHA channels are considered. The analysis is applicable to fading environments where the channel memory is short compared to the propagation delay. It is shown that smaller delay may be achieved using replications and, in noisy conditions, can also improve throughput.

Yan, Tsun-Yee; Clare, Loren P.

1986-01-01

292

Using Mobile Robots to Teach Articial Intelligence Research Skills  

Microsoft Academic Search

Successful Articial Intelligence researchers must be able to think creatively and critically, communicate eectively and evaluate the results of their work. Therefore, it is important in fostering quality research skills. We also wanted a project that would be fun and exciting, appeal to a wide range of students and allow for explorations in a range of AI topics. We felt

Daniel M. Gaines; Natasha Balac

293

Journal of Intercultural Communication Research Vol. 35, No. 2, July 2006, pp. 99116  

E-print Network

Journal of Intercultural Communication Research Vol. 35, No. 2, July 2006, pp. 99­116 Backchannel and nonverbal communication training in intercultural interactions were discussed. Keywords: Backchannel Responses; Intercultural Communication; Nonverbal Communication; Communication Accommodation Theory

Northern British Columbia, University of

294

RESEARCH PAPER Responses of leaf nitrogen and mobile carbohydrates in  

E-print Network

RESEARCH PAPER Responses of leaf nitrogen and mobile carbohydrates in different Quercus species; environmental changes; global warming; non-structural carbohydrates; oak; soluble sugars; starch. Correspondence. For example, drought was found to influence the rnetabolism of soluble carbohydrates (Hanson & Hitz 1982

295

Research Report Acupuncture mobilizes the brain's default mode and its  

E-print Network

Research Report Acupuncture mobilizes the brain's default mode and its anti-correlated network work has shown that acupuncture stimulation evokes deactivation of a limbic­ paralimbic and functional connectivity of these regions during acupuncture vs. tactile stimulation and vs. acupuncture

Napadow, Vitaly

296

Research Challenges and Opportunities in Mobile Applications [DSP Education  

Microsoft Academic Search

tions, especially focusing on educational aspects and research problems, pointing out issues and opportunities for students in this area. Our goal is to explore challenges, possibilities, and approaches for enabling speech processing, as well as convenient and effective speech and multimodal user interfaces for mobile environments.

Dilek Hakkani-Tur; Gokhan Tur; Larry Heck

2011-01-01

297

When Robots Meet People: Research Directions In Mobile Robotics  

Microsoft Academic Search

Recent research in the field of mobile robotics has led to significant progress along various dimensions. Applications such as robots that guide blind or mentally handicapped people, robots that clean large office buildings and department stores, robots that assist people in recreational activities, etc., are clearly in reach, and for many of those target domains prototypes are readily available. This

Sebastian Thrun

1998-01-01

298

Health effects: scientific research and mobile phone testing  

Microsoft Academic Search

A decade ago, a major research initiative, with orchestrated monetary and programmatic support from both industry and the government, was launched to investigate the biological effects and health implications of radio frequency (RF) radiation emitted from cellular mobile telephones. The subject remains a focus of public concern and shows no sign of relenting. There is a lack of scientific consensus

J. C. Lin

2002-01-01

299

A data architecture for research in mobile health  

E-print Network

architecture and the solution we have created. Keywords: M-health, data architecture, security, research data 1 INTRODUCTION Mobile health or m-health, as an enhancement or even replacement of e-health and regular in which face to face contact is not required. M-health faces the same problem as e-health: there has been

Utrecht, Universiteit

300

User Modelling and Mobile Learning Educational Technology Research Group, Electronic, Electrical and Computer Engineering,  

E-print Network

User Modelling and Mobile Learning Susan Bull Educational Technology Research Group, Electronic Introduction Educational institutions are starting to introduce mobile learning into courses. In line commonly used by an individual student in different locations; and a mobile open learner model

Bull, Susan

301

Mobile Networks and Applications 2 (1997) 285301 285 Communication protocol design to facilitate re-use based on the  

E-print Network

-layer communication among multiple protocol entities (PEs), assuming the standard ISO/OSI Reference ModelMobile Networks and Applications 2 (1997) 285­301 285 Communication protocol design to facilitate formal descriptions for communication protocols and the effective development methodologies used

Khan, Javed I.

302

Communication and Sensing Trade-Offs in Decentralized Mobile Sensor Networks: A Cross-Layer Design Approach  

E-print Network

Communication and Sensing Trade-Offs in Decentralized Mobile Sensor Networks: A Cross-Layer Design the trade-offs between communication and sensing objectives, by determining the optimal sensor configurations when introducing imperfect communication. We further illustrate the performance degradation caused

Murray, Richard M.

303

Providing lightweight telepresence in mobile communication to enhance collaborative living  

E-print Network

Two decades of computer-supported cooperative work (CSCW) research has addressed how people work in groups and the role technology plays in the workplace. This body of work has resulted in a myriad of deployed technologies ...

Marmasse, Natalia, 1962-

2004-01-01

304

Mobile Media Devices and Communication Applications as a Form of Augmentative and Alternative Communication: An Assessment of Family Wants, Needs, and Preferences  

E-print Network

This study assessed the wants, needs, and preferences of families at various stages of the decision-making process relative to mobile media technology as a form of augmentative and alternative communication (AAC). A survey entitled "iDevices, AAC...

Meder, Allison

2012-05-31

305

Mobile Learning: The Significance of New Mobile and Wireless Communications Technologies for Education  

Microsoft Academic Search

\\u000a At present, the popular perception of mobile telephones in the UK, including the education sector, is generally negative:\\u000a they are perceived as a nuisance and distraction (Stone, 2002, p. 262).\\u000a \\u000a \\u000a The image of schoolchildren staring out of the classroom window, minds preoccupied with daydreams, could be supplanted by\\u000a one of students staring forward — not daydreaming but interacting with vibrating

Gerard Goggin

306

Communicating the Importance of Undergraduate Research to Legislators  

ERIC Educational Resources Information Center

The Council on Undergraduate Research (CUR) hosts an annual undergraduate research poster session on Capitol Hill to communicate to the US Congress the importance of undergraduate research and to express thanks for the federal funding of undergraduate research programs. At the "Posters on the Hill" event held on 19 April 2005 in the Rayburn House…

Karukstis, Kerry

2005-01-01

307

Land mobile communications satellite missions (LAMOCOSAMIS) task 4: Hybrid system concept  

NASA Astrophysics Data System (ADS)

The possibility of a hybrid satellite/terrestrial network for land mobile communication in Europe was assessed. The interdependency of the system parameters makes the problem of satellite mission difficult to approach, and the regulatory context (no frequency allocation for land mobile satellite service in Europe) offers more fields of investigation, as UHF and L-Band have to be considered as candidate frequency bands. It is shown that in L-Band, a capacity of 100 telephone channels is possible with spacecraft of the EUROSTAR class, indicating that a hybrid concept is attractive.

1985-12-01

308

Land mobile satellite communication system. Volume 3: Annexes to volume 2: Particular aspects of market analyses  

NASA Astrophysics Data System (ADS)

The socioeconomic desirability in terms of market demand, technical economic feasibility, and price-performance for a Land Mobile Communication system ground based and/or satellite aided, able to satisfy the request of the traffic demand, foreseeable in the 1995 to 2005 time frame, for the Western European countries was assessed. The criterion of economic value of the mobile system is considered as the driving element. Data on traffic; socioeconomic factors; economic factors; and radiotelephony, paging, and dispatch subscription and value for money trends are presented.

Carnebianca, C.; Pavesi, B.; Tuozzi, A.; Capone, R.

1986-06-01

309

1 Introduction Embedded with mobility, communication and processing  

E-print Network

, sensor data turns imprecise and uncertain considering the hardware restrictions of sensor devices, thanks to research and standardisation programs in this domain [3, 5], Geographic Information Systems organizations as Open Geospatial Consortium (OGC) or the National Oceanic and Atmospheric Administration (NOAA

Servigne, Sylvie

310

Research of the mobile-code-based file system for portable information device  

Microsoft Academic Search

While the mobile communication device is developing into the portable information device, it is necessary to design a distributed file-system in such a mobile environment. In order to do it, we must consider the relative shortage of the portable storage and low computation ability of a portable information device as well as unreliable and low-performance networks. By using mobile code

Yurong Xu; Shouqian Sun; Yunhe Pan

2001-01-01

311

Maintaining communication link based on AODV routing protocol in mobile robot networks  

NASA Astrophysics Data System (ADS)

Wired computer networks are vital in modern life. However, these networks are extremely vulnerable to disaster or attack in emergency situations. Therefore, how to maintain communication link under emergency situations is very important. In this paper, we utilize a series of autonomous mobile slave robots which follow behind the lead robot and automatically stop where needed to maintain an ad hoc network for guaranteeing a link between the lead robot and its remote monitor/control station. To accomplish this target, an efficient communication protocol limitation mobile robots broadcast based on AODV (LMRB-AODV) is proposed for deployment in multi-robot system. After then the lead robot could carry service traffics to the monitor station under emergency situations through the communication link. At any instance, the lead robot has the ability to reclaim the relay robot(s) which are unneeded in the network to rejoin the convoy behind the lead robot and use it to extend the range of wireless communication when the radio frequency (RF) shortcuts are detected by the lead robot. All relay deployment and reclaiming strategy functions occur without the operator's involvement. Finally, we provide a comparative study of their performance in a number of different simulation environments. The results show that the proposed scheme is very efficient in maintaining communication link in wireless network.

Hu, Hui; Jiang, Hong

2007-12-01

312

New Voices in the Workplace: Research Directions in Multicultural Communication.  

ERIC Educational Resources Information Center

Develops a two-step framework (resistance to privileged discourse followed by harmonic discourse) for understanding multicultural communication in organizations based on the assumption of cultural difference. Suggests four directions for future research to create the data base that would allow development of a model of multicultural communication

Fine, Marlene G.

1991-01-01

313

Aerospace Communications at the NASA Glenn Research Center  

NASA Technical Reports Server (NTRS)

The Communications Division at the NASA Glenn Research Center in Cleveland Ohio has as its charter to provide NASA and the Nation with our expertise and services in innovative communications technologies that address future missions in Aerospace Technology, Spaceflight, Space Science, Earth Science, Life Science and Exploration.

Miranda, Felix A.

2006-01-01

314

The development of research and innovation policies based on a benchmarking assessment: the case of mobile communications technology R&D in the new member states of the EU  

Microsoft Academic Search

This paper presents the process and the results that led to an objective assessment of 34 research programmes from 14 countries based on a multifactor analysis. The programmes that were analysed come from the EU's new member states and the accession countries. The methodology used was specially developed for policy development purposes and for the design of the roadmaps leading

Borka Jerman-Blazic

2008-01-01

315

Triangulation of communication skills in qualitative research instruments.  

PubMed

Triangulation is a credible and useful method of conducting research which can result in an increase in both quality and quantity of data gathered. The five documented types of triangulation (data, investigator, theoretical, methodological, unit of analysis) do not completely answer all the needs of nurse researchers, particularly in the field of qualitative research. Using more than one method of data collection from within the same research tradition (within-method triangulation) is an accepted and effective technique. Extending the concept of triangulation to include the development of research tools leads to the proposal that the conscious use of two or three types of communication within each qualitative research instrument would improve its effectiveness over a tool which used only one type. This application of 'triangulation of communication skills' is considered within each of the major qualitative research tools, and the benefits outlined. The implications for nursing research and nurse researchers of consciously using non-verbal cues to supplement verbal information are described. It is suggested that using triangulation of communication skills in this way may improve the validity of data obtained and, if clearly documented, increase the credibility of the findings. In particular, when conducting qualitative interviews, the expert use of triangulation of communication skills will enhance the quality and quantity of data gathered. To this end, novice researchers need education and practice in using communication skills to best effect, in order to ensure the validity and completeness of their findings. PMID:8894885

Begley, C M

1996-10-01

316

Trellis coding with Continuous Phase Modulation (CPM) for satellite-based land-mobile communications  

NASA Technical Reports Server (NTRS)

This volume of the final report summarizes the results of our studies on the satellite-based mobile communications project. It includes: a detailed analysis, design, and simulations of trellis coded, full/partial response CPM signals with/without interleaving over various Rician fading channels; analysis and simulation of computational cutoff rates for coherent, noncoherent, and differential detection of CPM signals; optimization of the complete transmission system; analysis and simulation of power spectrum of the CPM signals; design and development of a class of Doppler frequency shift estimators; design and development of a symbol timing recovery circuit; and breadboard implementation of the transmission system. Studies prove the suitability of the CPM system for mobile communications.

1989-01-01

317

Issues for the integration of satellite and terrestrial cellular networks for mobile communications  

NASA Technical Reports Server (NTRS)

Satellite and terrestrial cellular systems naturally complement each other for land mobile communications, even though present systems have been developed independently. The main advantages of the integrated system are a faster wide area coverage, a better management of overloading traffic conditions, an extension to geographical areas not covered by the terrestrial network and, in perspective, the provision of only one integrated system for all mobile communications (land, aeronautical, and maritime). To achieve these goals, as far as possible the same protocols of the terrestrial network should be used also for the satellite network. Discussed here are the main issues arising from the requirements of the main integrated system. Some results are illustrated, and possible future improvements due to technical solutions are presented.

Delre, Enrico; Mistretta, Ignazio; Dellipriscoli, Francesco; Settimo, Franco

1991-01-01

318

Role of strategic communication in nursing theory and research.  

PubMed

Linking the process of nursing with theory and research in interpersonal competence is important in building a comprehensive theory of nursing. One dimension of interpersonal competence is the ability to use communication as a strategic mode of nursing intervention. The study of strategic communication can proceed by identifying communication-relevant nursing objectives, obstacles that inhibit the accomplishment of these objectives, and interpersonal strategies that can be employed to address these obstacles and facilitate goal attainment. The use of free response data collection procedures and theoretically grounded and hierarchically ordered message coding systems represents a viable method to analyze strategic communication. PMID:6435510

Kasch, C R; Lisnek, P M

1984-10-01

319

Combining EU Terminology with Communication and Ontology Research Rodolfo Maslias  

E-print Network

Combining EU Terminology with Communication and Ontology Research Rodolfo Maslias Terminology up EU terminology to the science and industry aspects of the field. This presentation will focus in referencing and creating definitions, legal notice addressing copyright, ownership and responsibility issues

Boyer, Edmond

320

The communication investigator: Teaching research methods to undergraduates  

Microsoft Academic Search

This essay explores the basic communication research course for undergraduates. Discussed are several key notions for making this course valuable to the undergraduate: the attitude of the instructor, the attitude of the students, course requirements and activities, and evaluation techniques.

Don W. Stacks; Mark Hickson III

1991-01-01

321

Toward Theory-Based Research in Political Communication.  

ERIC Educational Resources Information Center

Praises the theoretical and methodological potential of the field of political communication. Calls for greater interaction and cross fertilization among the fields of political science, sociology, economics, and psychology. Briefly discusses relevant research methodologies. (MJP)

Simon, Adam F.; Iyengar, Shanto

1996-01-01

322

Performance of the unique-word-reverse-modulation type demodulator for mobile satellite communications  

Microsoft Academic Search

This paper proposes a new type of coherent demodulator, the unique-word (UW)-reverse-modulation type demodulator, for burst signal controlled by voice operated transmitter (VOX) in mobile satellite communication channels. The demodulator has three individual circuits: a pre-detection signal combiner, a pre-detection UW detector, and a UW-reverse-modulation type demodulator. The pre-detection signal combiner combines signal sequences received by two antennas and improves

Tomohiro Dohi; Kazumasa Nitta; Takashi Ueda

1993-01-01

323

The future generations of mobile communications based on broadband access technologies  

Microsoft Academic Search

The forthcoming mobile communication systems are expected to provide a wide variety of services, from high-quality voice to high-definition videos, through high data rate wireless channels anywhere in the world. The high data rate requires broad frequency bands, and sufficient broadband can be achieved in higher frequency bands such as microwave, Ka-band, and millimeter-wave. Broadband wireless channels have to be

Shingo Ohmori; Yasushi Yamao; Nobuo Nakajima

2000-01-01

324

Cooperative signal reception and down-link beam forming in cellular mobile communications  

Microsoft Academic Search

A cooperative signal reception and down-link beam-forming algorithm is proposed for mobile communication systems employing phase-shift-keying (PSK) modulation. Down-link beam optimality is defined as maximizing the desired reference user's average received power while keeping the noise power plus total amount of average powers received by other users less than or equal to a certain constant level. The proposed algorithm requires

Hiromitsu Asakura; Tadashi Matsumoto

1999-01-01

325

Signal recognition and signature code acquisition in CDMA mobile packet communications  

Microsoft Academic Search

Fast and reliable signal sense and signature code synchronization for direct-sequence spread-spectrum (DS-SS) signals are key issues in the design of the receiver for modern packet code-division multiple-access (CDMA) radio networks for mobile communications; this motivates the study of the signal recognition and code-acquisition (SR\\/CA) scheme we describe in this paper. Specifically, starting from elementary estimation and detection theory criteria,

Riccardo De Gaudenzi; Filippo Giannetti; Marco Luise

1998-01-01

326

Tantalisingly Close: An Archaeology of Communication Desires in Discourses of Mobile Wireless Media  

Microsoft Academic Search

While many studies on mobile wireless communication devices predominantly take a micro-scale approach and concentrate their often ethnographically informed focus on use values, social implications, conversation strategies, changing norms and ethics, culture-dependent domestication, and so forth, with this Ph.D. dissertation I propose to venture into a more historical and comparative direction, mainly in order to shed light on and engage

I. O. de Vries

2008-01-01

327

A linear array antenna using bifilar helical elements for mobile satellite communications  

Microsoft Academic Search

In mobile satellite communication systems such as the AMSC\\/TMI system [Lunsford et al., 1992], circularly polarized omni-directional antennas are attractive for vehicle antennas because any satellite tracking mechanism in the azimuth direction is not necessary for these antennas [Ohmori, 1991]. As one type of omni-directional antenna, a bifilar helical antenna has been proposed [Nakano et al., 1991]. This antenna is

Yoshihiko KONISHI; Masataka OHTSUKA; Makoto MATSUNAGA; Takashi KATAGI

1994-01-01

328

A description of QUALCOMM Automatic Satellite Position Reporting (QASPR(R)) for mobile communications  

NASA Technical Reports Server (NTRS)

Two satellite position reporting has been introduced into the OmniTRACS mobile satellite communication system. This system significantly improves position reporting reliability and accuracy while simplifying the terminal's hardware. The positioning technique uses the original OmniTRACS TDMA timing signal formats in the forward and return link directions plus an auxiliary, low power forward link signal through a second satellite to derive distance values. The distances are then converted into the mobile terminal's latitude and longitude in real time. A minor augmentation of the spread spectrum profile of the return link allowed the resolution of periodic ambiguities. The system also locates the two satellites in real time with fixed platforms in known locations using identical mobile terminal hardware. Initial accuracies of 1/4 mile have been realized uniformly throughout the USA using a satellite separation of 22 degrees and there are no dead zones, skywaves, or cycle slips as found in terrestrial systems like LORAN-C.

Ames, William G.

1990-01-01

329

A description of QUALCOMM Automatic Satellite Position Reporting (QASPR(R)) for mobile communications  

NASA Astrophysics Data System (ADS)

Two satellite position reporting has been introduced into the OmniTRACS mobile satellite communication system. This system significantly improves position reporting reliability and accuracy while simplifying the terminal's hardware. The positioning technique uses the original OmniTRACS TDMA timing signal formats in the forward and return link directions plus an auxiliary, low power forward link signal through a second satellite to derive distance values. The distances are then converted into the mobile terminal's latitude and longitude in real time. A minor augmentation of the spread spectrum profile of the return link allowed the resolution of periodic ambiguities. The system also locates the two satellites in real time with fixed platforms in known locations using identical mobile terminal hardware. Initial accuracies of 1/4 mile have been realized uniformly throughout the USA using a satellite separation of 22 degrees and there are no dead zones, skywaves, or cycle slips as found in terrestrial systems like LORAN-C.

Ames, William G.

330

Managing Communication Availability and Interruptions: A Study of Mobile Communication in an Oncology Department  

Microsoft Academic Search

Wireless phones and text messaging are tremendously popular in many areas of society. However, they are still relatively unused in hospitals where pagers are a pervasive communication device that is notoriously difficult to replace. This paper studies pager and wireless phone use at the oncology de- partment at University Hospital of North Norway. Participatory observation and interviews with physicians are

Jeremiah Scholl; Per Hasvold; Eva Henriksen; Gunnar Ellingsen

2007-01-01

331

Satellite-aided mobile communications limited operational test in the trucking industry  

NASA Technical Reports Server (NTRS)

An experiment with NASA's ATS-6 satellite, that demonstrates the practicality of satellite-aided land mobile communications is described. Satellite communications equipment for the experiment was designed so that it would be no more expensive, when mass produced, than conventional two-way mobile radio equipment. It embodied the operational features and convenience of present day mobile radios. Vehicle antennas 75 cm tall and 2 cm in diameter provided good commercial quality signals to and from trucks and jeeps. Operational applicability and usage data were gathered by installing the radio equipment in five long-haul tractor-trailer trucks and two Air Force search and rescue jeeps. Channel occupancy rates are reported. Air Force personnel found the satellite radio system extremely valuable in their search and rescue mission during maneuvers and actual rescue operations. Propagation data is subjectively analyzed and over 4 hours of random data is categorized and graded as to signal quality on a second by second basis. Trends in different topographic regions are reported. An overall communications reliability of 93% was observed despite low satellite elevation angles ranging from 9 to 24 degrees.

Anderson, R. E.; Frey, R. L.; Lewis, J. R.

1980-01-01

332

Communication between Consumers and Producers of Student Affairs Research.  

ERIC Educational Resources Information Center

To facilitate communication between researchers and research users, 268 American College Personnel Association members nominated topics in need of further research. Participants identified staff burnout, counselor effectiveness, faculty advising, older/nontraditional students, student recruitment/retention, and goals/motivations of contemporary…

Caple, Richard B.; Voss, Colleen Hester

1983-01-01

333

The researcher's dilemma: evaluating trust in computer-mediated communication  

Microsoft Academic Search

The aim of this paper is to establish a methodological foundation for human-computer interaction (HCI) researchers aiming to assess trust between people interacting via computer- mediated communication (CMC) technology. The most popular experimental paradigm currently employed by HCI researchers are social dilemma games based on the Prisoner's Dilemma (PD), a technique originating from economics. HCI researchers employing this experimental paradigm

Jens Riegelsberger; Martina Angela Sasse; John D. Mccarthy

2003-01-01

334

Large space antenna communications systems: Integrated Langley Research Center/Jet Propulsion Laboratory technology development activities. 1: Introduction  

NASA Technical Reports Server (NTRS)

The Jet Propulsion Laboratory and the Langley Research Center have been developing technology related to large space antennas (LSA) during the past several years. The need for a communication system research program became apparent during the recent studies for the Land Mobile Satellite System. This study indicated the need for additional research in (1) electromagnetic analysis methods, (2) design and development of multiple beam feed systems, and (3) the measurement methods for LSA reflectors.

Campbell, T. G.

1983-01-01

335

Overview of communications programs  

NASA Technical Reports Server (NTRS)

The objective of the communications program is to advance critical areas of enabling and enhancing communication technologies that support commercial needs, science, and exploration missions for the 1990's and beyond. The technology program consists of research and technology development in the following areas: RF technology; digital technology; optical communications; mobile communications; and systems integration, test, and evaluation.

Depaula, Ramon P.

1991-01-01

336

Scientific Communication in Educational Research. Final Report.  

ERIC Educational Resources Information Center

A series of studies concerned with the dissemination and assimilation of material contained in journal articles in educational research were conducted. These studies dealt with authors of the articles and other educational researchers conducting research in the same subject matter areas as the articles. The dissemination process was found to be…

Nelson, Carnot E.

337

LEXIS: Applications for Research in Communication & Law.  

ERIC Educational Resources Information Center

One response to the large and rapidly growing number of legal cases with which nonlawyer researchers must deal is computerized legal data retrieval technology. LEXIS, an example of such technology, improves upon traditional research tools in two ways: it increases the speed with which researchers may discover relevant documents and, through its…

Rodgers, Raymond S.; Barefield, Paul A.

338

Research Priorities in Networking and Communications Research (Workshop Report)  

NSF Publications Database

... theory Storage channels Modeling and system analysis Communications signal processing Radio systems ... have sprung up. * Funding levels are still well short of the needs of the field relative to its ...

339

A Survey of Context-Aware Mobile Computing Research  

Microsoft Academic Search

Context-aware computing is a mobile computing paradigm in which applications can discover and take advantage of contextual information (such as user location, time of day, nearby people and devices, and user activity). Since it was proposed about a decade ago, many researchers have studied this topic and built several context-aware applications to demonstrate the usefulness of this new technology. Context-aware

Guanling Chen; David Kotz

2000-01-01

340

Scientific Report: Resource friendly and large scale group communication on support for mobile middleware  

Microsoft Academic Search

The research groups of EPFL and Chalmers are both activly participating in the Minema network. Previous meetings have shown that there is a good match in research interests in particular in the area of large scale group communication. The purpose of this visit was to strengthen the coorperation between the research groups on a project in the context of Minema.

Boris Koldehofe

341

Experiment Plan of ETS-8 in Orbit : Mobile Communications and Navigation  

NASA Astrophysics Data System (ADS)

The experiment of S-Band Mobile Communications/Broadcasting and L/S-Band Satellite Navigation is the main objectives of Engineering Test Satellite - 8 (ETS-8), which will be launched in 2004 into geostationary orbit at 146 degree East. In this paper, the basic experiment plan is described. After the function tests of satellite in orbit, participation of those who have interest in this experiment are welcome. For the mobile communications/broadcasting, two deployable reflectors (17 meter x 19 meter, each) and 400 W class active phased array feeder with 31 SSPAs are installed in ETS-8. Three beams are used simultaneously to cover Japan and neighbor region. Two kinds of onboard processors are also installed, that are for voice and high-speed packet communication, respectively. The ground terminal for voice communications is as small as conventional cellar phone, and that for packet is similar size of notebook type PC. For satellite navigation, two Cesium clocks are installed. The coverage area is Asia -Pacific hemisphere. The experiment will be conducted by use of ground stations and signals from GPS.The positioning accuracy is evaluated by changing RF frequency, code pattern and chip rate. To determine the precise orbital parameters of satellite, laser ranging of satellite is planned in cooperation with foreign institutes.

Homma, M.; Hama, S.; Kohata, H.

2002-01-01

342

Operations to Research: Communication of Lessons Learned  

NASA Technical Reports Server (NTRS)

This presentation explores ways to build upon previous spaceflight experience and communicate this knowledge to prepare for future exploration. An operational approach is highlighted, focusing on selection and retention standards (disease screening and obtaining medical histories); pre-, in-, and post-flight monitoring (establishing degrees of bone loss, skeletal muscle loss, cardiovascular deconditioning, medical conditions, etc.); prevention, mitigation, or treatment (in-flight countermeasures); and, reconditioning, recovery, and reassignment (post-flight training regimen, return to pre-flight baseline and flight assignment). Experiences and lessons learned from the Apollo, Skylab, Shuttle, Shuttle-Mir, International Space Station, and Orion missions are outlined.

Fogarty, Jennifer

2009-01-01

343

Research Directions in Family Communication: Proceedings of the Family Communication Research Conference (Evanston, Illinois, September 6-8, 1984).  

ERIC Educational Resources Information Center

In a conference focusing on issues in research methods, family theory, and family therapy as they relate to family communication and on future research needs, this document consists of papers presented by the 12 participants. Specific titles and speakers were as follows: "Kinship Relationships," by Mary Anne Fitzpatrick; "Research Potentials in…

Yerby, Janet, Ed.

344

An overview of the technical design of MSAT mobile satellite communications services  

NASA Astrophysics Data System (ADS)

The Canadian MSAT mobile satellite communications system is being implemented in cooperation with the American Mobile Satellite Consortium (AMSC). Two satellites are to be jointly acquired and each satellite is expected to backup the other. This paper describes the technical concepts of the services to be offered and the baseline planning of the infrastructure for the ground segment. MSAT service requirements are analyzed for mobile radio, telephone, data, and aeronautical services. The MSAT system will use nine beams in a narrow range of L-band frequencies with frequency reuse. Beams may be added to cover flight information areas in the Atlantic and Pacific oceans. The elements of the network architecture are: a network control centre, data hub stations, gateway stations, base stations, mobile terminals, and a signalling system to interconnect the elements of the system. The network control center will manage the network and allocate space segment capacity; data hub stations will support a switched packet mobile data service; the gateway stations will provide interconnection to the public telephone system and data networks; and the base stations will support private circuit switched voice and data services. Several alternative designs for the signalling system are described.

Davies, N. George

345

Mobile Communication and Civil Society: Linking Patterns and Places of Use to Engagement with Others in Public  

ERIC Educational Resources Information Center

This study examined whether and how mobile communication influences the extent to which one engages with new people in public settings. Contrary to our expectation, general use of the technology in public did not detract from conversing with strangers. Shifting focus from "where" one uses the mobile phone to "how" it is used, we found that uses…

Campbell, Scott W.; Kwak, Nojin

2011-01-01

346

The benefits of computer-mediated communication in nursing research.  

PubMed

Use of the Internet, and the opportunity to utilise computer-mediated communication (CMC) provides new alternatives for nurse researchers to collect data. The use of CMC for research purposes is advantageous for both researchers and participants. Through this mode of communication, recruitment of participants can be enhanced through reaching individuals who are geographically distant, and nurses have the opportunity to provide participants with true anonymity, which may be beneficial when exploring sensitive issues. This paper explores the existing literature and draws on healthcare studies that have used CMC as a data collection tool. PMID:19072194

East, Leah; Jackson, Debra; O'Brien, Louise; Peters, Kathleen

2008-08-01

347

Communications, Signal Processing, and Telemetering Research Program Review  

NASA Technical Reports Server (NTRS)

A Communications, Signal Processing, and Telemetering Research Program Review was held on February 23, 1999. Research conducted under the grant was presented and reviewed, for progress, and for possible technology transfers. The research reviewed was in the following areas: (1) Bandwidth-efficient Modulation and nonlinear equalization; (2) Investigation of an architecture for parallel signal processing applicable to communications problems; (3)Coded partial response over satellites; (4) synchronization at Low SNR; (5) Serial concatenated convolutional codes and some implementation issues on high rate turbo codes; (6) Flight experiments; (7) Real time doppler tracking; (8) Space protocol testing; (9) Lightweight optical communications without carrying a laser in space. The presentations are given by the graduate students who performed the research.

1999-01-01

348

Critical Communicative Methodology: Informing Real Social Transformation through Research  

ERIC Educational Resources Information Center

The critical communicative methodology (CCM) is a methodological response to the dialogic turn of societies and sciences that has already had an important impact in transforming situations of inequality and exclusion. Research conducted with the CCM implies continuous and egalitarian dialogue among researchers and the people involved in the…

Gomez, Aitor; Puigvert, Lidia; Flecha, Ramon

2011-01-01

349

202 IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, VOL. 49, NO. 1, JANUARY 2000 Effect of Mobile Velocity on Communications in  

E-print Network

on the performance of a communication system operating in a multi- path fading channel. To incorporate the effect202 IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, VOL. 49, NO. 1, JANUARY 2000 Effect of Mobile Velocity on Communications in Fading Channels Michael J. Chu, Student Member, IEEE, and Wayne E. Stark

350

Research on the Advertisement Effect of Push Type Mobile Advertisement  

Microsoft Academic Search

Due to the development in mobile telecommunication, mobile advertisements using mobile telecommunication devices are drawing the attention as the new advertisement mean, following the internet advertisement, and the market size of the mobile advertisement is forecasted to only grow. Understanding of the characteristic of mobile medium and analyses of and application plans to the various newly developed advertisement types are

Jung woo Lee; Choong sik Lee; Yong suk Park

2009-01-01

351

Opening communication channels with people living with HIV using mobile phone text messaging: insights from the CAMPS trial  

PubMed Central

Background Using two-way mobile phone text messages to improve adherence to antiretroviral medication enhances communication between patients and health workers. We describe the implications of participants’ responses to text messages in the Cameroon Mobile Phone SMS (CAMPS) trial. Findings This is a cross-sectional analysis of data from the intervention arm of the CAMPS trial. CAMPS was a randomized controlled trial of motivational text messaging versus usual care to improve adherence to antiretroviral medication among people living with HIV in Yaounde, Cameroon (n?=?200) over a 6 month period. Participants in the intervention arm (n?=?101) were given a contact phone number, but were not required to respond to their reminder messages. If they did, their responses were noted and reported as counts and percentages. We received 99 phone calls and 55 text messages (154 responses) from 48 participants during the study period. The median number of responses was 1 (first quartile [Q1]: 1; third quartile [Q3]: 3). Half (n?=?79, 51.1%) of them were expressions of gratitude. The rest included requests for logistical (n?=?21, 13.6%), medical (n?=?20, 12.9%) and financial (n?=?11, 7.1%) support. Conclusion Initiating two-way mobile communication opens more channels for people living with HIV to express unmet needs. Researchers, policy makers and clinicians should be ready to respond to the needs expressed by patients who respond to text messages. Trial registration Pan-African Clinical Trials Registry: PACTR201011000261458; Clinicaltrials.gov: NCT01247181 PMID:23557081

2013-01-01

352

Communications Development,  

E-print Network

Research Methods, ELEC6021 (EZ619) S Chen What's New in Communications #15; Imagine a few scenarios course, we only go through some A B C 1 Research Methods, ELEC6021 (EZ619) S Chen Wireless and Mobile network 2 Research Methods, ELEC6021 (EZ619) S Chen For Those Keen to Read #15; Any good text books

Chen, Sheng

353

Using Electronic Surveys in Organizational\\/Employee Communication Research: A Study at GE's Global Research Center  

Microsoft Academic Search

This study explores methodological issues that communication scholars and practitioners face when administering electronic surveys within for-profit organizations. In 2000, the researchers conducted a series of three cross-sectional studies within General Electric's (GE) Global Research Center. The Center is located in Niskayuna, NY. An equivalent version of a communication survey was administered electronically to a random stratified sample of GE

JOE R. DOWNING; RUSSELL S. CLARK

2007-01-01

354

An Ecological Framework for Cancer Communication: Implications for Research  

PubMed Central

The field of cancer communication has undergone a major revolution as a result of the Internet. As recently as the early 1990s, face-to-face, print, and the telephone were the dominant methods of communication between health professionals and individuals in support of the prevention and treatment of cancer. Computer-supported interactive media existed, but this usually required sophisticated computer and video platforms that limited availability. The introduction of point-and-click interfaces for the Internet dramatically improved the ability of non-expert computer users to obtain and publish information electronically on the Web. Demand for Web access has driven computer sales for the home setting and improved the availability, capability, and affordability of desktop computers. New advances in information and computing technologies will lead to similarly dramatic changes in the affordability and accessibility of computers. Computers will move from the desktop into the environment and onto the body. Computers are becoming smaller, faster, more sophisticated, more responsive, less expensive, and—essentially—ubiquitous. Computers are evolving into much more than desktop communication devices. New computers include sensing, monitoring, geospatial tracking, just-in-time knowledge presentation, and a host of other information processes. The challenge for cancer communication researchers is to acknowledge the expanded capability of the Web and to move beyond the approaches to health promotion, behavior change, and communication that emerged during an era when language- and image-based interpersonal and mass communication strategies predominated. Ecological theory has been advanced since the early 1900s to explain the highly complex relationships among individuals, society, organizations, the built and natural environments, and personal and population health and well-being. This paper provides background on ecological theory, advances an Ecological Model of Internet-Based Cancer Communication intended to broaden the vision of potential uses of the Internet for cancer communication, and provides some examples of how such a model might inform future research and development in cancer communication. PMID:15998614

Intille, Stephen S; Zabinski, Marion F

2005-01-01

355

A spread-spectrum modem using constant envelope BPSK for a mobile satellite communications terminal  

NASA Technical Reports Server (NTRS)

This paper describes a 5-kilobit/s spread spectrum modem with a 1.275 mega-Hz chip rate for mobile satellite communications. We used a Viterbi decoder with a coding gain of 7.8 dB at a BER of 10(exp -5) to decrease the required receiver power. This reduces the cost of communication services. The spread spectrum technique makes the modem immune to terrestrial radio signals and keeps it from causing interference in terrestrial radio systems. A class C power amplifier reduces the modem's power consumption. To avoid nonlinear distortion caused by the amplifier, the envelope of the input signal is kept constant by adding quadrature channel signal to the BPSK signal. To simulate the worst case, we measured the modem's output spectrum using a limiting amplifier instead of the class C amplifier, and found that 99 percent of the spectral power was confined to the specified 2.55 mega-Hz bandwidth.

Iizuka, N.; Yamashita, A.; Takenaka, S.; Morikawa, E.; Ikegami, T.

1990-01-01

356

Statistically validated mobile communication networks: Evolution of motifs in European and Chinese data  

E-print Network

Big data open up unprecedented opportunities to investigate complex systems including the society. In particular, communication data serve as major sources for computational social sciences but they have to be cleaned and filtered as they may contain spurious information due to recording errors as well as interactions, like commercial and marketing activities, not directly related to the social network. The network constructed from communication data can only be considered as a proxy for the network of social relationships. Here we apply a systematic method, based on multiple hypothesis testing, to statistically validate the links and then construct the corresponding Bonferroni network, generalized to the directed case. We study two large datasets of mobile phone records, one from Europe and the other from China. For both datasets we compare the raw data networks with the corresponding Bonferroni networks and point out significant differences in the structures and in the basic network measures. We show eviden...

Li, Ming-Xia; Jiang, Zhi-Qiang; Kaski, Kimmo; Kertész, Janos; Miccichè, Salvatore; Tumminello, Michele; Zhou, Wei-Xing; Mantegna, Rosario N

2014-01-01

357

Experiment Plan of ETS-8 in orbit: Mobile communications and navigation  

NASA Astrophysics Data System (ADS)

The experiment of mobile communications and broadcasting by S-band and the satellite navigation by L/S-band are the main objectives of Engineering Test Satellite - 8 (ETS-8), which will be launced in 2004 into geostationary orbit at 146 degree East. In this paper, the current status of ETS-8 is introduced at first and the basic experiment plan is described. For the mobile communications/broadcasting, two deployable reflectors (17 meters × 19 meters, each) and a 400 W class active phased array feeder with 31 SSPAs are installed in ETS-8. Three beams are used simultaneously to cover Japan and neighbor region. Two kinds of onboard processors are also installed, which are dedicated to voice and high-speed packet communication, respectively. The ground terminal for voice communications is as small as conventional cellular phone, and that for packet is similar size of notebook type PC. For satellite navigation, two Cesium clocks are installed. The coverage area is Asia-Pacific hemisphere. The experiment will be conducted by use of ground stations and signals from GPS. The positioning accuracy is evaluated by changing RF frequency, code pattern and chip rate. To determine the precise orbital parameters of satellite, the laser ranging method is adopted. This satellite navigation experiment will be conducted in cooperation with foreign and domestic institutes. After the funtion tests of satellite in orbit, it will be from 2005 year, the opportunity to conduct some experiment used of ETS-8 will provide. The participation of those who have interest in these experiments is welcome.

Homma, M.; Hama, S.; Kohata, H.; Hamamoto, N.; Tanaka, M.

2003-08-01

358

Statistically validated mobile communication networks: the evolution of motifs in European and Chinese data  

NASA Astrophysics Data System (ADS)

Big data open up unprecedented opportunities for investigating complex systems, including society. In particular, communication data serve as major sources for computational social sciences, but they have to be cleaned and filtered as they may contain spurious information due to recording errors as well as interactions, like commercial and marketing activities, not directly related to the social network. The network constructed from communication data can only be considered as a proxy for the network of social relationships. Here we apply a systematic method, based on multiple-hypothesis testing, to statistically validate the links and then construct the corresponding Bonferroni network, generalized to the directed case. We study two large datasets of mobile phone records, one from Europe and the other from China. For both datasets we compare the raw data networks with the corresponding Bonferroni networks and point out significant differences in the structures and in the basic network measures. We show evidence that the Bonferroni network provides a better proxy for the network of social interactions than the original one. Using the filtered networks, we investigated the statistics and temporal evolution of small directed 3-motifs and concluded that closed communication triads have a formation time scale, which is quite fast and typically intraday. We also find that open communication triads preferentially evolve into other open triads with a higher fraction of reciprocated calls. These stylized facts were observed for both datasets.

Li, Ming-Xia; Palchykov, Vasyl; Jiang, Zhi-Qiang; Kaski, Kimmo; Kertész, János; Miccichè, Salvatore; Tumminello, Michele; Zhou, Wei-Xing; Mantegna, Rosario N.

2014-08-01

359

Research and Reality: Using Mobile Messages to Promote Maternal Health in Rural India  

E-print Network

Research and Reality: Using Mobile Messages to Promote Maternal Health in Rural India Divya for improving maternal health practices in rural India. Specifically, we investigate the use of mobile phone

Canny, John

360

Defining moments in risk communication research: 1996-2005.  

PubMed

Ten years ago, scholars suggested that risk communication was embarking on a new phase that would give increased attention to the social contexts that surround and encroach on public responses to risk information. A decade later, many researchers have answered the call, with several defining studies examining the social and psychological influences on risk communication. This article reviews risk communication research appearing in the published literature since 1996. Among studies, social trust, the social amplification of risk framework, and the affect heuristic figured prominently. Also common were studies examining the influence of risk in the mass media. Among these were content analyses of media coverage of risk, as well as investigations of possible effects resulting from coverage. The use of mental models was a dominant method for developing risk message content. Other studies examined the use of risk comparisons, narratives, and visuals in the production of risk messages. Research also examined how providing information about a risk's severity, social norms, and efficacy influenced communication behaviors and intentions to follow risk reduction measures. Methods for conducting public outreach in health risk communication rounded out the literature. PMID:16546920

McComas, Katherine A

2006-01-01

361

Images of Men and Women in Mobile Phone Advertisements: A Content Analysis of Advertisements for Mobile Communication Systems in Selected Popular Magazines  

Microsoft Academic Search

The present study was designed to analyze gender stereotypes in print advertisements for mobile communication systems in German popular magazines intended for men, women, and general readership. Depictions of both women and men are addressed. A total of 288 depictions were examined using Goffman’s (Gender advertisements, Harvard University Press, Cambridge, Massachusetts, 1979) framework for content analysis. Other variables studied were

Nicola Döring; Sandra Pöschl

2006-01-01

362

PANGAEA® - Research Data enters Scholarly Communication  

NASA Astrophysics Data System (ADS)

PANGAEA® (Data Publisher for Earth & Environmental Science) is an information system which represents the ideal functioning of the ICSU World Data System. Storing about half a million data sets from all fields of geosciences it belongs to the largest archives for observational data. Standard conform interfaces (ISO, OGC, W3C, OAI) enable access from a variety of data and information portals, among them the search engine of PANGAEA® itself (www.pangaea.de) and e.g. large portals like Thomson Reuter's Web of Knowledge and Google. All data sets in PANGAEA® are citable, fully documented, and can be referenced via persistent identifier (Digital Object Identifier - DOI) - a premise for data publication. Together with other ICSU World Data Centers and the Technical Information Library in Germany(TIB) PANGAEA® had a share in the implementation of a DOI based registry for scientific data, which by now is supported by a worldwide consortium of libraries (www.datacite.org). The long term goal is a "crossref for scientific data". Seeing the overall positive impact on the quality and availability of scientific data the PANGAEA® group is offering publication services since several years. They were the main initiators of the "Earth System Science Journal" at Copernicus (http://earth-system-science-data.net/), which is used for standalone peer reviewed data publications. A further milestone was building up strong co-operations with commercial publishers as Elsevier, Nature, Springer, Wiley, AGU, and others. A common web service allows to reference related data in PANGAEA® directly from an articles' abstract page (e.g. ScienceDirect). The next step with commercial publishers is to further integrate the editorial process for the publication of related data with the publication procedures on the journal side, which practically means an extension of the peer review and a synchronization of editorial processes. In this presentation we will introduce the auditorium with the data publication workflow used by PANGAEA®, the technical background of the dynamic linking approach done between conventional publishers and the data repository, and the further steps for integrating editorial processes on both sides. PANGAEA® is operated as a joint long term facility by MARUM at the University Bremen and the Alfred Wegener Institute for Polar and Marine Research (AWI). More than 80% of the funding results from project data management and the implementation of spatial data infrastructures (47 International, 46 European and 37 national projects since the last 12 years - www.pangaea.de/projects).

Schindler, U.; Diepenbroek, M.; Grobe, H.

2012-04-01

363

RESEARCH COMMUNICATION Evidence that Swi/Snf directly  

E-print Network

RESEARCH COMMUNICATION Evidence that Swi/Snf directly represses transcription in S. cerevisiae 02115, USA Many studies have established that the Swi/Snf family of chromatin-remodeling complexes transcription. We now pre- sent chromatin immunoprecipitation evidence that the Swi/Snf complex of Saccharomyces

Winston, Fred

364

Testing Equivalence in Communication Research: Theory and Application  

Microsoft Academic Search

Although equivalence testing is preferred when a researcher's goal is to support the null hypothesis (i.e., no substantial effect), equivalence tests are virtually unknown and unused in the communication field. This article provides the rationale for and theoretical background of equivalence testing and offers examples of equivalence tests for the independent and dependent groups t-test and tests of association using

René Weber; Lucy Popova

2012-01-01

365

Broadening Research on Communication and School Public Relations  

ERIC Educational Resources Information Center

Effective communication and public relations are recognized as core competencies for school administration as evidenced by national standards guiding preparation and licensing in most states. Even so, surprisingly little research has been conducted by doctoral students and professors on these two subjects. This article presents a case for…

Kowalski, Theodore J.

2005-01-01

366

Critical Communicative Methodology: Including Vulnerable Voices in Research through Dialogue  

ERIC Educational Resources Information Center

This article describes how Critical Communicative Methodology (CCM) has been used successfully to analyse educational inequalities in ways that generate real transformation towards social justice. We begin by arguing that educational research today should employ new methodological approaches that can ensure the inclusion of different voices in…

Puigvert, Lidia; Christou, Miranda; Holford, John

2012-01-01

367

The FASEB Journal Research Communication Overexpression of tetraspanins affects multiple  

E-print Network

., and Lishner M. Overexpression of tetraspanins affects multiple myeloma cell survival and invasive potential of ubiquitously expressed cell membrane proteins called tetraspanins (4­7). Tetraspanins modulate a varietyThe FASEB Journal · Research Communication Overexpression of tetraspanins affects multiple myeloma

368

Changing Models for Researching Pedagogy with Information and Communications Technologies  

ERIC Educational Resources Information Center

This paper examines changing models of pedagogy by drawing on recent research with teachers and their students as well as theoretical developments. In relation to a participatory view of learning, the paper reviews existing pedagogical models that take little account of the use of information and communications technologies as well as those that…

Webb, M.

2013-01-01

369

Transit Marketing: A Program of Research, Demonstration and Communication.  

National Technical Information Service (NTIS)

The report recommends a five-year program of research, demonstration and communication to improve the effectiveness of marketing practice in the U.S. transit industry. To achieve this objective, the program is oriented toward five major program areas: (1)...

T. J. Atherton, W. R. Loudon, C. A. White

1985-01-01

370

Communicative Language Testing: Current Issues and Future Research  

ERIC Educational Resources Information Center

This article discusses a range of current issues and future research possibilities in Communicative Language Testing (CLT) using, as its departure point, the key questions which emerged during the CLT symposium at the 2010 Language Testing Forum. The article begins with a summary of the 2010 symposium discussion in which three main issues related…

Harding, Luke

2014-01-01

371

Health Care Communication: A Problematic Site for Applied Linguistics Research.  

ERIC Educational Resources Information Center

Addresses how applied linguists and those concerned with discourse analysis in particular have recently approached the study of health care communication, especially in intercultural contexts, and relates these approaches to studies undertaken by researchers in other academic disciplines, such as the sociology of medicine and by health care…

Candlin, Christopher N.; Candlin, Sally

2003-01-01

372

Original Research Communication Prion Protein Expression and Functional Importance in  

E-print Network

1 1 Original Research Communication Prion Protein Expression and Functional Importance illustrations: 7 Color illustrations: 2 (online 2) Page 1 of 48 Antioxidants&RedoxSignaling PrionProtein prion protein (PrPC ), a GPI-anchored glycoprotein, which we reported to be highly expressed in human

Paris-Sud XI, Université de

373

Place-Based Attributes Predict Community Membership in a Mobile Phone Communication Network  

PubMed Central

Social networks can be organized into communities of closely connected nodes, a property known as modularity. Because diseases, information, and behaviors spread faster within communities than between communities, understanding modularity has broad implications for public policy, epidemiology and the social sciences. Explanations for community formation in social networks often incorporate the attributes of individual people, such as gender, ethnicity or shared activities. High modularity is also a property of large-scale social networks, where each node represents a population of individuals at a location, such as call flow between mobile phone towers. However, whether or not place-based attributes, including land cover and economic activity, can predict community membership for network nodes in large-scale networks remains unknown. We describe the pattern of modularity in a mobile phone communication network in the Dominican Republic, and use a linear discriminant analysis (LDA) to determine whether geographic context can explain community membership. Our results demonstrate that place-based attributes, including sugar cane production, urbanization, distance to the nearest airport, and wealth, correctly predicted community membership for over 70% of mobile phone towers. We observed a strongly positive correlation (r?=?0.97) between the modularity score and the predictive ability of the LDA, suggesting that place-based attributes can accurately represent the processes driving modularity. In the absence of social network data, the methods we present can be used to predict community membership over large scales using solely place-based attributes. PMID:23451034

Caughlin, T. Trevor; Ruktanonchai, Nick; Acevedo, Miguel A.; Lopiano, Kenneth K.; Prosper, Olivia; Eagle, Nathan; Tatem, Andrew J.

2013-01-01

374

A mobile phone: mobility, materiality and everyday Swahili trading practices  

Microsoft Academic Search

This article engages with the recent literature on material culture, ‘follow-the-thing geographies’, mobility and mobile communication technologies by linking these theoretical reflections to ethnographic research in East Africa. Using the biography of a specific mobile phone as a window through which to shed light on the spatial and cultural practices in which the object is embedded, it attempts to provide

Julia Pfaff

2010-01-01

375

Exponential Random Graph (p*) Models as a Method for Social Network Analysis in Communication Research  

Microsoft Academic Search

Since the 1970s, communication researchers have utilized social network analysis to understand mass, health, organizational, and interpersonal communication. This article introduces communication researchers to a new class of social network analysis methods, exponential random graph (p*) models. This new method represents the latest advancement in social network methodology and will enhance the trajectory of social network research in the communication

Michelle Shumate; Edward T. Palazzolo

2010-01-01

376

Mobile phone technology: a new paradigm for the prevention, treatment, and research of the non-sheltered "street" homeless?  

PubMed

Individuals experiencing homelessness have disproportionately high rates of health problems. Those who perceive themselves as having greater access to their social support networks have better physical and mental health outcomes as well as lower rates of victimization. Mobile phones offer a connection to others without the physical constraints of landlines and, therefore, may make communication (e.g., access to one's social support networks) more feasible for homeless individuals. This, in turn, could lead toward better health outcomes. This exploratory study examined mobile phone possession and use among a sample of 100 homeless men and women who do not use the shelter system in Philadelphia, PA. Interviews were comprised of the Homeless Supplement to the Diagnostic Interview Schedule, a technology module created for this investigation, and the substance use and psychiatric sections of the Addiction Severity Index. Almost half (44%) of the sample had a mobile phone. In the past 30 days, 100% of those with mobile phones placed or received a call, over half (61%) sent or received a text message, and one fifth (20%) accessed the Internet via their mobile phone. Participants possessed and used mobile phones to increase their sense of safety, responsibility (employment, stable housing, personal business, and sobriety or "clean time"), and social connectedness. Mobile phones could potentially be used by public health/health care providers to disseminate information to the street homeless, to enhance communication between the street homeless and providers, and to increase access for the street homeless to prevention, intervention, and aftercare services. Finally, this technology could also be used by researchers to collect data with this transient population. PMID:20397058

Eyrich-Garg, Karin M

2010-05-01

377

Mobile Phone Technology: A New Paradigm for the Prevention, Treatment, and Research of the Non-sheltered "Street" Homeless?  

PubMed Central

Individuals experiencing homelessness have disproportionately high rates of health problems. Those who perceive themselves as having greater access to their social support networks have better physical and mental health outcomes as well as lower rates of victimization. Mobile phones offer a connection to others without the physical constraints of landlines and, therefore, may make communication (e.g., access to one’s social support networks) more feasible for homeless individuals. This, in turn, could lead toward better health outcomes. This exploratory study examined mobile phone possession and use among a sample of 100 homeless men and women who do not use the shelter system in Philadelphia, PA. Interviews were comprised of the Homeless Supplement to the Diagnostic Interview Schedule, a technology module created for this investigation, and the substance use and psychiatric sections of the Addiction Severity Index. Almost half (44%) of the sample had a mobile phone. In the past 30 days, 100% of those with mobile phones placed or received a call, over half (61%) sent or received a text message, and one fifth (20%) accessed the Internet via their mobile phone. Participants possessed and used mobile phones to increase their sense of safety, responsibility (employment, stable housing, personal business, and sobriety or “clean time”), and social connectedness. Mobile phones could potentially be used by public health/health care providers to disseminate information to the street homeless, to enhance communication between the street homeless and providers, and to increase access for the street homeless to prevention, intervention, and aftercare services. Finally, this technology could also be used by researchers to collect data with this transient population. PMID:20397058

2010-01-01

378

Requirements for a mobile communications satellite system. Volume 1: Executive summary  

NASA Technical Reports Server (NTRS)

Three types of satellite-aided mobile communications are considered for users in areas not served by (terrestrial) cellular radio systems. In System 1, mobile units are provided a direct satellite link to a gateway station, which serves as the interface to the terrestrial toll network. In System 2, a terrestrial radio link similar to those in cellular systems connects the mobile unit to a translator station; each translator relays the traffic from mobile units in its vicinity, via satellite, to the regional gateway. It is not feasible for System 2 to provide ubiquitous coverage. Therefore, System 3 is introduced, in which the small percentage of users not within range of a translator are provided a direct satellite link as in System 1. While System 2 can operate with leased satellite capacity, Systems 1 and 3 require a dedicated satellite. A major portion of this study is concerned with the design of a satellite for System 1. A weight limit of 10,000 lbs, corresponding to the projected 1990 STS capability, is imposed on the design. Frequency re-use of the allocated spectrum, through multiple satellite beams, is employed to generate the specified system capacity. Both offset-fed and center-fed reflectors are considered. For an assumed 10-MHz allocation and a population of 350,000 subscribers, a two-satellite system is required. The reflector diameters corresponding to offset-fed and center-fed geometries are 46 m and 62 m, respectively. Thus, large-space-structure technology is inherent to the implementation of System 1. In addition to establishing the technical requirements for the three types of satellite systems, the monthly service charge needed to provide a specified return on invested capital is computed. A net present value analysis is used for this purpose.

1983-01-01

379

Technical characteristics of the OmniTRACS: The first operation mobile Ku-band satellite communications system  

NASA Technical Reports Server (NTRS)

The techinical characteristics of the OmniTRACS system are described. The system is the first operational mobile Ku-band satellite communications system and provides two-way message and position determination service to mobile terminals using existing Ku-band satellites. Interference to and from the system is minimized by the use of special spread-spectrum techniques, together with low power and low data rate transmissions.

Antonio, Franklin P.; Gilhousen, Klein S.; Jacobs, Irwin M.; Weaver, Linday A., Jr.

1988-01-01

380

NASA satellite communications application research. Phase 2: Efficient high power, solid state amplifier for EFH communications  

NASA Technical Reports Server (NTRS)

The final report describes the work performed from 9 Jun. 1992 to 31 Jul. 1993 on the NASA Satellite Communications Application Research (SCAR) Phase 2 program, Efficient High Power, Solid State Amplifier for EHF Communications. The purpose of the program was to demonstrate the feasibility of high-efficiency, high-power, EHF solid state amplifiers that are smaller, lighter, more efficient, and less costly than existing traveling wave tube (TWT) amplifiers by combining the output power from up to several hundred solid state amplifiers using a unique orthomode spatial power combiner (OSPC).

Benet, James

1993-01-01

381

An Empirical Studies on Mobile Phone Dependency Syndrome  

Microsoft Academic Search

Mobile phones have become so popular that nearly everybody owns one. According to the investigation research of National Communications Commission, the popularity rate of mobile phone was 107.3%. It means that third-generation mobile services have become the mainstream of Taiwan mobile services. In the future, during the continuous progress of mobile technology, each person will be more seriously dependence on

Dong-Her Shih; Ching-Chiang Chen; Hsiu-Sen Chiang

2009-01-01

382

What Should We Do about the Highly Mobile Student? A Research Brief.  

ERIC Educational Resources Information Center

In view of the statistics on the high degree of mobility in the student population across the United States, it is surprising that there is so little definitive research available on the effects of mobility on the achievement and adjustment of mobile students and so few suggestions to schools about how best to provide educational services to an…

Newman, J.

383

SmartAds: Bringing Contextual Ads to Mobile Apps Microsoft Research  

E-print Network

SmartAds: Bringing Contextual Ads to Mobile Apps Suman Nath Microsoft Research sumann consumers spent 30% more time on mobile apps than on traditional web, advertis- ers spent 1600% less money from the mobile platform. Using data from top 1200 apps in Windows Phone market- place, and a one

Gummadi, Ramakrishna

384

Mobility and Market Research: Outdoor Advertising and the Commercial Ontology of the City  

Microsoft Academic Search

This article explores the centrality of mobility in the practices of the outdoor advertising industry, analysing how commercial conceptualisations of mobility orient the production and sale of advertising space on roadside billboards, panels in pedestrian zones, on buses and taxis, and in train stations. I explore how the industry's market research practices conceive of urban space as mobility, and how

Anne M. Cronin

2008-01-01

385

Multipurpose Control System and Mobile Robot Development, for Control Algorithms Research  

Microsoft Academic Search

In the present papers the example of multipurpose control system and mobile robot development is presented. The mobile robot and control system are developed for control algorithms research on the basis of small scientific laboratory. In the presented project the mobile robot is developed on the basis of radio-controlled toy car by QUNXING Company. This platform is big enough to

Denis A. Olchanski; Sergey A. Levykh

386

Research on Mobile Location Service Design Based on Android  

Microsoft Academic Search

Android platform is a new generation of smart mobile phone platform launched by Google. Android provides the support of mobile map and location service, which is probably a concern of vast numbers of developers. So far, the development of mobile map and location applications is complex and difficult, and is often required to pay high copyright fees to map makers.

Xianhua Shu; Zhenjun Du; Rong Chen

2009-01-01

387

MoLeNET Mobile Learning Conference 2009: Research Papers  

ERIC Educational Resources Information Center

The Mobile Learning Network (MoLeNET) is a unique collaborative approach to encouraging, supporting, expanding and promoting mobile learning, primarily in English post-14 education and training, via supported shared cost mobile learning projects. Collaboration at national level involves participating institutions and the Learning and Skills…

Guy Parker, Ed.

2010-01-01

388

A survey of mobility models for ad hoc network research  

Microsoft Academic Search

In the performance evaluation of a protocol for an ad hoc network, the protocol should be tested under realistic conditions including, but not limited to, a sensible transmission range, limited buffer space for the storage of messages, representative data traffic models, and realistic movements of the mobile users (i.e., a mobility model). This paper is a survey of mobility models

Tracy Camp; Jeff Boleng; Vanessa Davies

2002-01-01

389

Conducting Technical Communication Research via the Internet: Guidelines for Privacy, Permissions, and Ownership in Educational Research.  

ERIC Educational Resources Information Center

Reviews ways educational research has most commonly involved the Internet. Discusses issues that complicate educational research conducted in computer-enhanced instructional environments, focusing on privacy, ownership, and permissions. Offers a case study at an online writing center, and provides guidelines for technical communication researchers

Kastman, Lee-Ann M.; Gurak, Laura J.

1999-01-01

390

A 4MJ mobile pulse power facility for electrothermal-chemical gun research  

Microsoft Academic Search

In support of advanced electric gun research in progress within the US Army, a mobile pulsed power system has been developed and made operational as part of the Army Research Laboratory (ARL) electric gun research facility. This mobile system has a maximum energy storage capability of 4 MJ, and it can deliver gigawatt levels of pulsed power over time periods

Gary L. Katulka; M. DelGuercio; R. Pastore; D. Singh; R. J. Burdalski

1995-01-01

391

Research on cognitive, social and cultural processes of written communication.  

PubMed

This article compiles the investigations carried out by a Research Group of the University of Granada, Spain. Its different projects on writing's cognitive social and cultural processes have been supported by the Spanish Government. This line of research joined together linguistic, psychological, social and cultural contributions to the development of writing from the 1970s. Currently, this line of research develops in collaboration with other European Universities: (a) Interuniversity Centre for Research On Cognitive Processing in Natural and Artificial Systems (ECONA), "La Sapienza" University of Rome (Italy); (b) Anadolu University, (Eskisehir, Turkey); (c) Coimbra University (Portugal); (d) University of Zaragoza (Spain); (e) the Institute of Education of the University of London (United Kingdom). The aforementioned collaboration is materializing into projects like the International Master on Multilingual Writing: Cognitive, Intercultural and Technological Processes of Written Communication ( http://www.multilingualwriting.com ) and the International Congress: Writing in the twenty-first Century: Cognition, Multilinguisim and Technologies, held in Granada ( http://www.asprogrades.org ). This research line is focussed on the development of strategies in writing development, basic to train twenty-first century societies' citizens. In these societies, participation in production media, social exchange and the development of multilingual written communication skills through new computer technologies spread multicultural values. In order to fulfil the social exigencies, it is needed to have the collaboration of research groups for designing and applying international research projects. PMID:19234731

Arroyo González, Rosario; Salvador Mata, Francisco

2009-08-01

392

Recent Research at the JPL Optical Communications Telescope Laboratory  

Microsoft Academic Search

The Optical Communications Telescope Laboratory is a state-of-the-art facility located at 2.2-km altitude on Table Mountain Wrightwood, CA. Designed for nighttime and daytime operation, the 1-m OCTL telescope tracks targets as close as 10-degrees to the sun, and satellites as low as 250-km. Maximum slew rates are 10 deg\\/sec elevation and 20 deg\\/sec azimuth. Research projects at the OCTL include

K. E. Wilson; M. Wright; M. Troy; J. Roberts; W. Roberts

2006-01-01

393

Is communication competence still good for interpersonal media?: Mobile phone and instant messenger  

Microsoft Academic Search

The concept of communication competence has developed in the area of nonmediated interpersonal communication. With the advent of digital media, interpersonal communication has been heavily dependent on interpersonal media. The sharp distinction between theories for nonmediated communication and mediated communication is disappearing. The interconnectedness of face-to-face communication and mediated interpersonal communication is a salient current phenomenon. To explore the relation

Yoosun Hwang

2011-01-01

394

Working Paper M. Hardy, History and trends of French research on organizational communication,  

E-print Network

communication ­ France ­ postmodernism ­ critical school ­ qualitative research Introduction Communication has-linguistic and anthropological turn in communication studies in France began in the 80', when some major books of the "School1 Working Paper M. Hardy, History and trends of French research on organizational communication

Boyer, Edmond

395

A Provably-Correct Protocol for Seamless Communication with Mobile, Multi-Homed Hosts  

E-print Network

Modern consumer devices, like smartphones and tablets, have multiple interfaces (e.g., WiFi and 3G) that attach to new access points as users move. These mobile, multi-homed computers are a poor match with an Internet architecture that binds connections to fixed end-points with topology- dependent addresses. As a result, hosts typically cannot spread a connection over multiple interfaces or paths, or change locations without breaking existing connections. In this paper, we introduce ECCP, an end-host connection control protocol that allows hosts to communicate over mul- tiple interfaces with dynamically-changing IP addresses. Each ECCP connection consists of one or more flows, each associated with an interface or path. A host can move an existing flow from one interface to another or change the IP address using in-band signaling, without any support from the underlying network. We use formal models to verify that ECCP works correctly in the presence of packet loss, out-of-order delivery, and frequent mobility...

Arye, Matvey; Kiefer, Robert; Rexford, Jennifer; Freedman, Michael J

2012-01-01

396

Research paper: The effects of hands-free communication device systems: communication changes in hospital organizations  

Microsoft Academic Search

ObjectiveTo analyze the effects that hands-free communication device (HCD) systems have on healthcare organizations from multiple user perspectives.DesignThis exploratory qualitative study recruited 26 subjects from multiple departments in two research sites located in Portland, Oregon: an academic medical center and a community hospital. Interview and observation data were gathered January through March, 2007.MeasurementsData were analyzed using a grounded theory approach.

Joshua E. Richardson; Joan S. Ash

2010-01-01

397

Communication: Slow relaxation, spatial mobility gradients, and vitrification in confined films.  

PubMed

Two decades of experimental research indicate that spatial confinement of glass-forming molecular and polymeric liquids results in major changes of their slow dynamics beginning at large confinement distances. A fundamental understanding remains elusive given the generic complexity of activated relaxation in supercooled liquids and the major complications of geometric confinement, interfacial effects, and spatial inhomogeneity. We construct a predictive, quantitative, force-level theory of relaxation in free-standing films for the central question of the nature of the spatial mobility gradient. The key new idea is that vapor interfaces speed up barrier hopping in two distinct, but coupled, ways by reducing near surface local caging constraints and spatially long range collective elastic distortion. Effective vitrification temperatures, dynamic length scales, and mobile layer thicknesses naturally follow. Our results provide a unified basis for central observations of dynamic and pseudo-thermodynamic measurements. PMID:25362264

Mirigian, Stephen; Schweizer, Kenneth S

2014-10-28

398

Topics in circuits for communications - Integrated circuits for channel coding in 3g cellular mobile wireless systems  

Microsoft Academic Search

Error control coding is a key element of any digital wireless communication system, minimizing the effects of noise and interference on the transmitted signal at the physical layer. In 3G mobile cellular wireless systems, error control coding must accommodate both voice and data users, whose requirements vary considerably in terms of latency, throughput, and the impact of errors on the

Charles Thomas; Mark A. Bickerstaff; Linda M. Davis; Thomas Prokop; Ben Widdup; Gongyu Zhou; D. Garrett; C. Nicol

2003-01-01

399

The Complexity of Social Mobilization in Health Communication: Top-Down and Bottom-Up Experiences in Polio Eradication  

Microsoft Academic Search

The Polio Eradication Initiative (PEI) has been one of the most ambitious global health efforts in recent times. Social mobilization (SM) has been a strategic component of the PEI. Yet, a close-up analysis of SM dynamics seems to be lacking in the health communication literature. We examine critical aspects of the PEI experience in an attempt to move from dominant

Rafael Obregón; Silvio Waisbord

2010-01-01

400

Measured path loss and multipath propagation characteristics in UHF and microwave frequency bands for urban mobile communications  

Microsoft Academic Search

This paper presents the frequency dependence of propagation loss and multipath propagation characteristics for urban mobile communications based on measurement results in Japanese urban areas. Path loss in reference frequencies from 457.2 MHz to 15.45 GHz increases according to the free space propagation power law in terms of frequency dependence for both macrocell and microcell environments. The standard deviation of

Yasuhiro Oda; Reiko Tsuchihashi; Kouichi Tsunekawa; Masaharu Hata

2001-01-01

401

Satellite applications to electric-utility communications needs. [land mobile satellite service  

NASA Technical Reports Server (NTRS)

Significant changes in the Nation's electric power systems are expected to result from the integration of new technology, possible during the next decade. Digital communications for monitor and control, exclusive of protective relaying, are expected to double or triple current traffic. A nationwide estimate of 13 Mb/s traffic is projected. Of this total, 8 Mb/s is attributed to the bulk-power system as it is now being operated (4 Mb/s). This traffic could be accommodated by current communications satellites using 3- to 4.5-m-diameter ground terminals costing $35,000 to $70,000 each. The remaining 5-Mb/s traffic is attributed to new technology concepts integrated into the distribution system. Such traffic is not compatible with current satellite technology because it requires small, low-cost ground terminals. Therefore, a high effective isotropic radiated power satellite, such as the one being planned by NASA for the Land Mobile Satellite Service, is required.

Horstein, M.; Barnett, R.

1981-01-01

402

Research on the key technologies of mobile digital maps  

NASA Astrophysics Data System (ADS)

Mobile and wireless technologies have evolved rapidly in recent years, especially the development of hardware devices, such as PDA and Smart phone. Different kinds of services and applications in these mobile devices, especially Mobile Geographic Information System and Location Based Service have been launched in recent years to help people to establish spatial relationship with the surroundings. Digital Map, which is a useful tool to assist a person for positioning and navigation, is usually included in these services. However, mobility of wireless devices, limited bandwidth of wireless networks, and limited storage capacity of mobile terminals seriously affect the performance of mobile digital maps and its application. In order to boom its application in mobile devices, this paper focuses on four important problems, i.e., data model optimization of mobile digital map, data organization and management at server side and client side respectively, data compression method, representation approaches on mobile terminals. In this paper, we adopt and modify the Europe transportation network standard GDF, accomplish effectively data compression with SVG, and present a new two-layer database structure to organize data. The digital maps can be expressed by multi-approaches, namely layers, districts and scales.

Ji, Cuiling; Xiao, Yongkang; Chi, Tianhe

2006-10-01

403

A metasynthesis of patient-provider communication in hospital for patients with severe communication disabilities: informing new translational research.  

PubMed

Abstract Poor patient-provider communication in hospital continues to be cited as a possible causal factor in preventable adverse events for patients with severe communication disabilities. Yet to date there are no reports of empirical interventions that investigate or demonstrate an improvement in communication in hospital for these patients. The aim of this review was to synthesize the findings of research into communication in hospital for people with severe communication disabilities arising from lifelong and acquired stable conditions including cerebral palsy, autism, intellectual disability, aphasia following stroke, but excluding progressive conditions and those solely related to sensory impairments of hearing or vision. Results revealed six core strategies suggested to improve communication in hospital: (a) develop services, systems, and policies that support improved communication, (b) devote enough time to communication, (c) ensure adequate access to communication tools (nurse call systems and communication aids), (d) access personally held written health information, (e) collaborate effectively with carers, spouses, and parents, and (f) increase the communicative competence of hospital staff. Currently there are no reports that trial or validate any of these strategies specifically in hospital settings. Observational and evaluative research is needed to investigate the ecological validity of strategies proposed to improve communication. PMID:25229213

Hemsley, Bronwyn; Balandin, Susan

2014-12-01

404

Wheeled Mobility Device Database for Transportation Safety Research and Standards  

Microsoft Academic Search

To address the issue of safely accessing and securing wheeled mobility devices in motor vehicles, more information characterizing current-production devices was needed. In a recent effort, frame characteristics of wheeled mobility devices were defined and a database developed for recording characteristics relevant to access and securement. A representative number of devices have been surveyed to measure key characteristics, and these

Gina Bertocci; Patricia Karg; Douglas Hobson

1997-01-01

405

Research on seam tracking controller of mobile welding robot  

Microsoft Academic Search

To solve the seam tracking problem of the welding mobile robot, a new controller based on the dynamics model of the mobile welding robot is designed. Self-turning fuzzy controller is designed to complete coordinately controlling of cross-slider and wheels, and exactly welding seam tracking was realized by use of the controller. To make the tracking more quickly and smoothly, it

Ting Zhang; Kai Li; Shijie Dai; Shumei Xiao; He Huang

2009-01-01

406

An Empirical Study of Graduate Student Mobility Underpinning Research Universities  

ERIC Educational Resources Information Center

The issue of international student mobility has had a profound effect on policy decision-making in the higher education system of essentially every country; however, the statistical data on this subject are insufficient, especially for graduate students. The purposes of this study are to substantiate the state of international mobility among…

Furukawa, Takao; Shirakawa, Nobuyuki; Okuwada, Kumi

2013-01-01

407

Manned earth orbital laboratories to perform communications/navigation research.  

NASA Technical Reports Server (NTRS)

Review of the feasibility of manned earth orbiting laboratories in the 1980s for solving problems identified with operational communication and navigation systems. A program of experiments recommended for implementation in the 1980 to 1990 period is presented. Equipment for conducting experiments is listed. Conceptual designs of laboratories which could be carried to orbit by the forthcoming NASA Space Shuttle Orbiter and then operated on orbit by an experimenter crew are discussed. Studies of the expected benefits, together with investigations of the configurations, mission considerations, and equipment selection result in the conclusion that manned communication/navigation research laboratories in earth orbit would be practical and effective, and that the experiments performed could derive meaningful information having application to future unmanned operational systems.

Waltz, D. M.; Quantock, C. W.

1972-01-01

408

Research into command, control, and communications in space construction  

NASA Technical Reports Server (NTRS)

Coordinating and controlling large numbers of autonomous or semi-autonomous robot elements in a space construction activity will present problems that are very different from most command and control problems encountered in the space business. As part of our research into the feasibility of robot constructors in space, the CSC Operations Group is examining a variety of command, control, and communications (C3) issues. Two major questions being asked are: can we apply C3 techniques and technologies already developed for use in space; and are there suitable terrestrial solutions for extraterrestrial C3 problems? An overview of the control architectures, command strategies, and communications technologies that we are examining is provided and plans for simulations and demonstrations of our concepts are described.

Davis, Randal

1990-01-01

409

A survey of message diffusion portocols in mobile ad hoc networks  

Microsoft Academic Search

For the last twenty years, mobile communications have experienced an explosive growth. In particular, one area of mobile communication, the Mobile Ad hoc Networks (MANETs), has attracted significant attention due to its multiple applications and its challenging research problems. On the other hand, the nodes mobility in these networks has introduced new challenges for the routing protocols, especially when the

Ahmad Al Hanbali; Mouhamad Ibrahim; V. Simon; E. Varga; I. Carreras

2008-01-01

410

New approaches to human mobility: using mobile phones for demographic research.  

PubMed

This article explores new methods for gathering and analyzing spatially rich demographic data using mobile phones. It describes a pilot study (the Human Mobility Project) in which volunteers around the world were successfully recruited to share GPS and cellular tower information on their trajectories and respond to dynamic, location-based surveys using an open-source Android application. The pilot study illustrates the great potential of mobile phone methodology for moving spatial measures beyond residential census units and investigating a range of important social phenomena, including the heterogeneity of activity spaces, the dynamic nature of spatial segregation, and the contextual dependence of subjective well-being. PMID:23192393

Palmer, John R B; Espenshade, Thomas J; Bartumeus, Frederic; Chung, Chang Y; Ozgencil, Necati Ercan; Li, Kathleen

2013-06-01

411

New Approaches to Human Mobility: Using Mobile Phones for Demographic Research  

PubMed Central

This article explores new methods for gathering and analyzing spatially rich demographic data using mobile phones. It describes a pilot study (the Human Mobility Project) in which volunteers around the world were successfully recruited to share GPS and cellular tower information on their trajectories and respond to dynamic, location-based surveys using an open-source Android application. The pilot study illustrates the great potential of mobile phone methodology for moving spatial measures beyond residential census units and investigating a range of important social phenomena, including the heterogeneity of activity spaces, the dynamic nature of spatial segregation, and the contextual dependence of subjective well-being. PMID:23192393

Palmer, John R.B.; Espenshade, Thomas J.; Bartumeus, Frederic; Chung, Chang Y.; Ozgencil, Necati Ercan; Li, Kathleen

2012-01-01

412

Mobile Sensor Technologies Being Developed.  

National Technical Information Service (NTIS)

The NASA Glenn Research Center is developing small mobile platforms for sensor placement, as well as methods for communicating between roving platforms and a central command location. The first part of this project is to use commercially available equipme...

L. C. Greer, L. G. Oberle

2003-01-01

413

A comparison of metropolitan and non-metropolitan employment characteristics: Indications of the size of non-metropolitan mobile communication services user classes  

NASA Technical Reports Server (NTRS)

The similarities and differences between areas inside and outside U.S. metropolitan areas were evaluated in terms of their commercial/industrial and government employment characteristics. The comparison focuses on the levels, shares, and composition of employment in the commercial/industrial and government sectors that represent potential classes of land mobile communications users. The major findings of the analysis are as follows: (1) non-metropolitan commercial/industrial user classes of land mobile communication services exist in significant numbers; (2) the compositions of non-metropolitan and metropolitan commercial/industrial user classes of land mobile communication services closely resemble each other; (3) non-metropolitan areas have significant levels of the government user classes that represent potential markets for land mobile communication services; and (4) non-metropolitan local governments have a significantly larger proportion of their employment in the primary user classes of private land mobile radio service than do metropolitan local governments.

Wilcox, R. E.

1985-01-01

414

The crucial role of research in multicultural and cross-cultural communication  

Microsoft Academic Search

Research is recognised as an essential part of planning and evaluation in most areas of marketing and corporate communication, including advertising, direct marketing and, increasingly, public relations and corporate communication disciplines such as employee communication and community relations. Understanding of audience interests, awareness, perceptions and information needs is critical to strategic planning of communication campaigns. Secondly, identification and quantification of

Jim R. Macnamara

2004-01-01

415

Low-mobility channel tracking for MIMO-OFDM communication systems  

NASA Astrophysics Data System (ADS)

It is now well understood that by exploiting the available additional spatial dimensions, multiple-input multiple-output (MIMO) communication systems provide capacity gains, compared to a single-input single-output systems without increasing the overall transmit power or requiring additional bandwidth. However, these large capacity gains are feasible only when the perfect knowledge of the channel is available to the receiver. Consequently, when the channel knowledge is imperfect, as is common in practical settings, the impact of the achievable capacity needs to be evaluated. In this study, we begin with a general MIMO framework at the outset and specialize it to the case of orthogonal frequency division multiplexing (OFDM) systems by decoupling channel estimation from data detection. Cyclic-prefixed OFDM systems have attracted widespread interest due to several appealing characteristics not least of which is the fact that a single-tap frequency-domain equalizer per subcarrier is sufficient due to the circulant structure of the resulting channel matrix. We consider a low-mobility wireless channel which exhibits inter-block channel variations and apply Kalman tracking when MIMO-OFDM communication is performed. Furthermore, we consider the signal transmission to contain a stream of training and information symbols followed by information symbols alone. By relying on predicted channel states when training symbols are absent, we aim to understand how the improvements in channel capacity are affected by imperfect channel knowledge. We show that the Kalman recursion procedure can be simplified by the optimal minimum mean square error training design. Using the simplified recursion, we derive capacity upper and lower bounds to evaluate the performance of the system.

Pagadarai, Srikanth; Wyglinski, Alexander M.; Anderson, Christopher R.

2013-12-01

416

Analysis and design of a multi-transceiver optical cylinder antenna for mobile free space optical communication  

NASA Astrophysics Data System (ADS)

Due to the notable influence of atmospheric effects and the objects relative motion, acquisition, pointing and tracking (APT) are the key technologies to establish the communication link in free space optical communication (FSO). In this paper, an all-direction, cylinder-shaped optical antenna is proposed, and the theory and method of beam control are mainly studied. On condition that the communication terminals move randomly and the antenna self-rotates in constant or variable velocity, numerical simulations are carried out. In detail, some significant parameters in practice are analyzed, like the communication time, actual bandwidth and interrupted time, and compared with theoretical results. The consequence shows that the beam control method is feasible, and this optical antenna can meet the demands of fast mobile FSO in a certain range of height.

Shang, Tao; Jia, Jijun; Wang, Xin

2012-11-01

417

Living flexibly? How Europe's science researchers manage mobility, fixed-term employment and life outside work  

Microsoft Academic Search

This paper draws from interviews with mobile science researchers to explore experiences of mobility and fixed-term employment in the EU. The paper takes a socio-legal approach, aiming to understand the contribution of EU law and policy to the resource framework within which career decisions are made. The high incidence of fixed-term employment and the expectation of geographic mobility in science

E. A. Oliver

2012-01-01

418

Research on the control of three-dimension based on the Mobile Internet Device  

Microsoft Academic Search

All kinds of computing terminals connect human beings and computers, even with everything by omnipresent communication network in the era of pervasive computing. The technology of human-computer interaction determines the possibility and agreeableness in practical application of the connection between human and everything. Mobile Internet Devices (MID) are in direct contact with end users, such as cell phone, tablet PC,

Jixiang Lu; Suihuai Yu; Ping Wang; Changde Lu

2010-01-01

419

7 CFR 3022.8 - Communication of research misconduct policies and procedures.  

...2014-01-01 false Communication of research misconduct policies and procedures...FINANCIAL OFFICER, DEPARTMENT OF AGRICULTURE RESEARCH INSTITUTIONS CONDUCTING USDA-FUNDED EXTRAMURAL RESEARCH; RESEARCH MISCONDUCT § 3022.8...

2014-01-01

420

7 CFR 3022.8 - Communication of research misconduct policies and procedures.  

Code of Federal Regulations, 2012 CFR

...2012-01-01 false Communication of research misconduct policies and procedures...FINANCIAL OFFICER, DEPARTMENT OF AGRICULTURE RESEARCH INSTITUTIONS CONDUCTING USDA-FUNDED EXTRAMURAL RESEARCH; RESEARCH MISCONDUCT § 3022.8...

2012-01-01

421

7 CFR 3022.8 - Communication of research misconduct policies and procedures.  

Code of Federal Regulations, 2013 CFR

...2013-01-01 false Communication of research misconduct policies and procedures...FINANCIAL OFFICER, DEPARTMENT OF AGRICULTURE RESEARCH INSTITUTIONS CONDUCTING USDA-FUNDED EXTRAMURAL RESEARCH; RESEARCH MISCONDUCT § 3022.8...

2013-01-01

422

Requirements for a mobile communications satellite system. Volume 3: Large space structures measurements study  

NASA Technical Reports Server (NTRS)

This study report defines a set of tests and measurements required to characterize the performance of a Large Space System (LSS), and to scale this data to other LSS satellites. Requirements from the Mobile Communication Satellite (MSAT) configurations derived in the parent study were used. MSAT utilizes a large, mesh deployable antenna, and encompasses a significant range of LSS technology issues in the areas of structural/dynamics, control, and performance predictability. In this study, performance requirements were developed for the antenna. Special emphasis was placed on antenna surface accuracy, and pointing stability. Instrumentation and measurement systems, applicable to LSS, were selected from existing or on-going technology developments. Laser ranging and angulation systems, presently in breadboard status, form the backbone of the measurements. Following this, a set of ground, STS, and GEO-operational were investigated. A third scale (15 meter) antenna system as selected for ground characterization followed by STS flight technology development. This selection ensures analytical scaling from ground-to-orbit, and size scaling. Other benefits are cost and ability to perform reasonable ground tests. Detail costing of the various tests and measurement systems were derived and are included in the report.

Akle, W.

1983-01-01

423

Adaptive MIMO-MLSE Blind Detection in Heterogeneous Stream Transmission for Mobile Radio Communications  

NASA Astrophysics Data System (ADS)

This paper proposes a novel MIMO system that introduces a heterogeneous stream (HTS) scheme and a blind signal detection method for mobile radio communications. The HTS scheme utilizes different modulation or coding methods for different MIMO streams, and the blind detection method requires no training sequences for signal separation, detection, and channel estimation. The HTS scheme can remove the ambiguity in identifying separated streams without unique words that are necessary in conventional MIMO blind detection. More specifically, two examples of HTS are considered: modulation type HTS (MHTS) and timing-offset type HTS (THTS). MHTS, which utilizes different modulation constellations with the same bandwidth for different streams, has been previously investigated. This paper proposes THTS which utilizes different transmission timing with the same modulation. THTS can make the blind detection more robust and effective with fractional sampling. The blind joint processing of detection and channel estimation performs adaptive blind MIMO-MLSE and is derived from an adaptive blind MLSE equalizer that employs the recursive channel estimation with the Moore-Penrose generalized inverse. Computer simulations show that the proposed system can achieve superior BER performance with Eb/N0 degradation of 1dB in THTS and 2.5dB in MHTS compared with the ideal maximum likelihood detection.

Kanno, Issei; Suzuki, Hiroshi; Fukawa, Kazuhiko

424

A new coherent demodulation technique for land-mobile satellite communications  

NASA Technical Reports Server (NTRS)

An advanced coherent demodulation technique is described for land mobile satellite (LMS) communications. The proposed technique features a combined narrow/wind band dual open loop carrier phase estimator, which is effectively able to compensate the fast carrier phase fluctuation by fading with sacrificing a phase slip rate. Also included is the realization of quick carrier and clock reacquisition after shadowing by taking open loop structure. Its bit error rate (BER) performance is superior to that of existing detection schemes, showing a BER of 1 x 10(exp -2) at 6.3 dB E sub b/N sub o over the Rician channel with 10 dB C/M and 200 Hz (1/16 modulation rate) fading pitch f sub d for QPSK. The proposed scheme consists of a fast response carrier recovery and a quick bit timing recovery with an interpolation. An experimental terminal model was developed to evaluate its performance at fading conditions. The results are quite satisfactory, giving prospects for future LMS applications.

Yoshida, Shousei; Tomita, Hideho

1990-01-01

425

Mobile Three Frequency Radar as Research Platform for Precipitation Profiling  

NASA Astrophysics Data System (ADS)

Precipitation profiling at the frequency bands of Ku, Ka and W bands are becoming increasingly popular in the studies of atmospheric microphysics. Ever since the introduction of Ku / Ka pair of frequencies for the Global Precipitation Measurement mission (GPM) and the success of W band in Cloudsat, the interest in precipitation profiling using these frequencies has increased. The profiling observations will also serve as ground validation instruments for several space missions such as GPM and EarthCARE [1]. In order to get better information to retrieve ice microphysics as well as to enhance sensitivity, we need to move from the standard S- and C-band weather radars to higher frequencies [2]. As was recently shown, the use of multi- frequency profiling yields important additional information compared to single-frequency radar mapping [3]. During the past four years a consortium of research, academic and private industries in Finland has been developing a flexible low-cost mobile three-band radar system for precipitation profiling. The feasibility of the concept is being demonstrated by implementing the Ku- and Ka-band part of the system. The antenna structure with antennas for Ku-, Ka- and W-band is completed allowing the pointing of all three antenna systems into the same direction during an azimuth and elevation scan. Using a freely programmable digital waveform generator and decoding electronics for the received data, the implementation of different wave form generation, compression and decoding schemes and their influence on the radar performance in the different bands can be evaluated and optimized. The modular design allows the connection of different transmitter control and receiver decoding units to any of the three band front-end electronics to evaluate the performance of different approaches in the various bands simultaneously. A real-time analysis software supports the data interpretation and system optimization during field tests. Via mobile internet connection and standard data formats the collected data can be made available for operative use. The mechanical integration on a standard car trailer allows the fast deployment to different locations. References [1] V. Chandrasekar, D. Moisseev, W. Schmidt, K. Rautiainen and A.-M Harri, "Scientific and engineering overview of the three frequency precipitation profiling radar at Helsinki" The 9th International Symposium on Advanced Environmental Monitoring and Modeling Helsinki, 2012. [2] V. Chandrasekar, H. Fukatsu and K. Mubarak, "Global mapping of attenuation at Ku- and Ka-band", IEEE Transactions on Geoscience and Remote Sensing, vol. 41, pp. 2166-2176, 2003 [3] J.Leinonen, D. Moisseev, V. Chandrasekar, J. Koskinen, "Mapping Radar Reflectivity Values of Snowfall Between Frequency Bands", IEEE Transactions on Geoscience and Remote Sensing, vol. 49, no.8, pp. 3047-3058, 2011 doi: 10.1109/TGRS.2011.2117432

Schmidt, Walter; Rautiainen, Kimmo; Harri, Ari-Matti

2014-05-01

426

Indiana Center for Intercultural Communication: Translating Health Discourse Research into Action  

E-print Network

Indiana Center for Intercultural Communication: Translating Health Discourse Research into Action Abstract The Indiana Center for Intercultural Communication (ICIC) is a university-based research and intercultural communication and applies its expertise to benefit the wider community. The Center also offers

Zhou, Yaoqi

427

An Individual's Experience: A Socio-Cultural Critique of Communication Apprehension Research  

ERIC Educational Resources Information Center

The purpose of this study was to understand what it could mean to have communication apprehension (CA). Literature that focuses on the research and theoretical aspects of communication apprehension was collected. From this research the concept of communication apprehension was conceptually defined, tools for measuring this phenomenon were…

Alley-Young, Gordon

2005-01-01

428

Perception and mobility research at Defence R&D Canada for UGVs in complex terrain  

NASA Astrophysics Data System (ADS)

The Autonomous Intelligent Systems Section at Defence R&D Canada - Suffield envisions autonomous systems contributing to decisive operations in the urban battle space. In this vision, teams of unmanned ground, air, and marine vehicles, and unattended ground sensors will gather and coordinate information, formulate plans, and complete tasks. The mobility requirement for ground-based mobile systems operating in urban settings must increase significantly if robotic technology is to augment human efforts in military relevant roles and environments. In order to achieve its objective, the Autonomous Intelligent Systems Section is pursuing research that explores the use of intelligent mobility algorithms designed to improve robot mobility. Intelligent mobility uses sensing and perception, control, and learning algorithms to extract measured variables from the world, control vehicle dynamics, and learn by experience. These algorithms seek to exploit available world representations of the environment and the inherent dexterity of the robot to allow the vehicle to interact with its surroundings and produce locomotion in complex terrain. However, a disconnect exists between the current state-of-the-art in perception systems and the information required for novel platforms to interact with their environment to improve mobility in complex terrain. The primary focus of the paper is to present the research tools, topics, and plans to address this gap in perception and control research. This research will create effective intelligence to improve the mobility of ground-based mobile systems operating in urban settings to assist the Canadian Forces in their future urban operations.

Trentini, Michael; Collier, Jack; Beckman, Blake; Digney, Bruce; Vincent, Isabelle

2007-04-01

429

Teacher Effectiveness, Mobility, and Attrition in Florida: A Descriptive Analysis. Research Brief  

ERIC Educational Resources Information Center

While there has been substantial research studying the factors that influence teachers' career decisions, there is far less literature on the relationship between teacher effectiveness, mobility, and attrition. In the paper "Teacher Effectiveness, Mobility, and Attrition in Florida: A Descriptive Analysis," Martin West and Matthew Chingos address…

National Center on Performance Incentives, 2008

2008-01-01

430

ADOPTION AND APPROPRIATION: TOWARDS A NEW THEORETICAL FRAMEWORK AN EXPLORATORY RESEARCH ON MOBILE TECHNOLOGIES IN FRENCH  

E-print Network

1 ADOPTION AND APPROPRIATION: TOWARDS A NEW THEORETICAL FRAMEWORK AN EXPLORATORY RESEARCH ON MOBILE for their comments. halshs-00155506,version1-18Jun2007 #12;2 ADOPTION AND APPROPRIATION: TOWARDS A NEW THEORETICAL. The pace of mobile phone adoption has been very high in the European Union (42% each year from 1995 to 2003

Paris-Sud XI, Université de

431

Compact, low profile antennas for MSAT and mini-M and Std-M land mobile satellite communications  

NASA Technical Reports Server (NTRS)

CAL Corporation has developed a new class of low profile radiating elements for use in planar phased array antennas. These new elements have been used in the design of a low cost, compact, low profile antenna unit for MSAT and INMARSAT Mini-M land mobile satellite communications. The antenna unit which measures roughly 32 cm in diameter by 5 cm deep incorporates a compact LNA and diplexer unit as well as a complete, low cost, beam steering system. CAL has also developed a low profile antenna unit for INMARSAT-M land mobile satellite communications. A number of these units, which utilize a microstrip patch array design, were put into service in 1994.

Strickland, P. C.

1995-01-01

432

Communication.  

ERIC Educational Resources Information Center

The following essays on communication are presented: communication as a condition of survival, communication for special purposes, the means of transmission of communication, communication within social and economic structures, the teaching of communication through the press, the teaching of modern languages, communication as a point of departure,…

Strauss, Andre

433

A comparison study of the uplink performance of W-CDMA and OFDM for mobile multimedia communications via LEO satellites  

Microsoft Academic Search

This article presents a comparison study of the uplink performance of two well-known transmission schemes, W-CDMA and OFDM, for mobile multimedia communications via LEO satellite. In order to provide a framework for a fair comparison we have considered for both schemes common parameters, including identical channel bandwidth, coding\\/decoding algorithms and similar net data rate. The values of these parameters have

A. Papathanassiou; A. K. Salkintzis; P. T. Mathiopoulos

2001-01-01

434

Student Nomads: Mobility in Ohio's Schools. Ohio Student Mobility Research Project  

ERIC Educational Resources Information Center

Student mobility is the phenomenon of students in grades K-12 changing schools for reasons other than customary promotion from elementary school to middle school or from middle school to high school. This non-promotional school change can occur during the school year or in the summer between school years. It may involve residential change, school…

Thomas B. Fordham Institute, 2012

2012-01-01

435

Understanding the behavior of mobile data services consumers  

Microsoft Academic Search

Due to rapid advances in the Internet and wireless technologies, a ubiquitous computing world is becoming a reality in the form of mobile computing. At the center of this phenomenon is mobile data services which arise from the convergence of advanced mobile communication technologies with data services. Despite the rapid growth in mobile data services, research into consumers’ usage behavior

Se-joon Hong; James Y. L. Thong; Jae-Yun Moon; Kar Yan Tam

2008-01-01

436

Ethics of Communications Research: (I) Treatment of Research Participants (Including the Role of Deception); (II) Responsibility to Society.  

ERIC Educational Resources Information Center

In exploring the role and status of the ethics that govern communication research, the two parts of this paper examine the practices of researchers and the role of deception in their methodology and conclusions, and the role of communication research as a whole to the society that it is supposed to benefit. At the end of both discussions are…

Gordon, Ronald D.

437

Mobile Computing and Databases - A Survey  

Microsoft Academic Search

The emergence of powerful portable computers, along with advances in wireless communication technologies, hasmade mobile computing a reality. Among the applications that are finding their way to the market of mobile computingthose thatinvolve data managementhold a prominent position. In the past few years, there has been a tremendous surge of research in thearea of data management in mobile computing. This

Daniel Barbará

1999-01-01

438

IEEE Wireless Communications December 20046 1536-1284/04/$20.00 2004 IEEE This research was sup-  

E-print Network

node comprises sensing, processing, transmission, mobilizer, position finding system, and power units (some of these components are optional, like the mobilizer). The same figure shows the communication- nal BS(s).1 A BS may be a fixed or mobile node capable of connecting the sensor network to an existing

Chen, Yuanzhu Peter

439

Satellite-aided mobile radio concepts study: Concept definition of a satellite-aided mobile and personal radio communication system  

Microsoft Academic Search

The satellite system requires the use of a large satellite antenna and spacecraft array power of about 12 kW or more depending on the operating frequency. Technology developments needed include large offset reflector multibeam antennas, satellite electrical power sybsystems providing greater than 12 kW of power, signal switching hardware, and linearized efficient solid state amplifiers for the satellite-aided mobile band.

R. E. Anderson

1979-01-01

440

Adaptive combination of cancelling co-channel interference and decoding of error-correcting codes for DS-SS CDMA mobile communication system  

Microsoft Academic Search

This paper introduces an adaptive cascaded combination of cancelling co-channel interference (CCI) and decoding of error-correcting codes for a DS-SS CDMA mobile communication system. The analysis of a previous study by Shaheen and Gupta (see IEEE IPCCC Proceedings, Phoenix, Arizona, March 1995) indicated that conventional CCI cancellation techniques might not be as effective, especially for heavily loaded mobile communication systems.

K. M. Shaheen; Someshwar C. Gupta

1995-01-01

441

Heliophysics Research at the National Observatory of Athens: Communicating Science  

NASA Astrophysics Data System (ADS)

The term heliophysics refers to the physics that controls the system that is being defined by the Sun, the heliosphere and the surrounding planets. Today, we are aware that we people live within the extended atmosphere of a living star, the Sun. Although, the light that the Sun provides creates and sustains life on Earth, its variability gives birth to streams of high energetic particles and radiation which could be harmful for the human life. The magnetic field and the atmosphere of the Earth provide powerful shielding against these threats, making the Earth an oasis within the Universe were life is in place to evolve and grow. We should all keep in mind, however, that the fate of life at Earth is bounded to the way it responds to the variability of the Sun. This united system that is being analyzed through heliophysics demands the understanding of the processes that take place within and at the face of the Sun as well as the interaction of the solar plasma and the emitted radiation with the Earth and the rest of the planets. Research on heliophysics at the National Observatory of Athens focuses at the analysis of the effect of the stormy Sun to the Earth. With this respect we use data from energetic particles, recoded onboard an armada of spacecraft, trying to decode the impact of solar storms. Given the fact that heliophysics is a vital and dynamic part of our everyday life, great care is being devoted to the communication of our research results to the general public in Greece, participating at large public outreach events like the Researcher's Night and with lectures/presentations delivered regularly to a variety of audiences, but also at a worldwide scale as our team acts as the National contact point for the International Space Weather Initiative (ISWI). In this work we present vital facts of our dominant Sun, we illustrate its effect at Earth and we discuss the effectiveness of the communication techniques that have been used in order to promote heliophysics research at a wider public.

Malandraki, Olga; Papaioannou, Athanasios; Patsou, Ioanna; Tziotziou, Kostas

2014-05-01

442

Research on telescope array for inter-satellites laser communication  

Microsoft Academic Search

Recent years have seen an explosive increase in the application of inter-satellites laser communication system. Considerations make phased arrays an attractive target for optical communication applications. This paper proposes a novel telescope array for inter-satellites laser communication and investigates phased telescope arrays to be employed in receive terminals of free-space laser inter-satellites communication links. Potential advantages over single monolithic telescopes

Li Zhou; Chuanhua Wen

2006-01-01

443

Consumer–provider communication research with special populations  

Microsoft Academic Search

As the US population becomes increasingly diverse, understanding consumer–provider communication among special populations becomes of paramount importance. Cultural competence is a key element in improving communication between non-minority providers and minority patients. This includes overcoming sociocultural and linguistic barriers that hinder access to care and diminish quality consumer–provider communication. Of special concern is the lack of cancer prevention communication between

Amelie G. Ramirez

2003-01-01

444

Communication and Early Childhood Research and Practice Center  

E-print Network

intervention/education for young children with special needs and their families. The Communication and Early to the field of early intervention/ education for young children with disabilities, communication disorders of Communication of Information, College of Education, and the Autism Institute in the College of Medicine. Goals

Sura, Philip

445

Communication and sustainable agriculture: Building agendas for research and practice  

Microsoft Academic Search

Communication cannot be overlooked as a component of sustainable agriculture; theoretical perspectives from communication science, such as coorientation and information systems analysis, can suggest ways to help improve the chances for sustainability, as can attention to specific types of communication. Communicationabout sustainable agriculture, which creates political-economic and social environments that promote development of sustainable systems, must more clearly define sustainability

Gerry Walter

1992-01-01

446

Residential mobility, technology & social ties  

Microsoft Academic Search

This research uses the disruption associated with residential mobility, to develop a deeper theoretical understanding of the role of communication technology in the initiation, maintenances and dissolution of social relationships. Residential mobility is a common yet stressful event. It represents a natural experiment, because it puts people in a situation where some of their previous face-to-face interactions must stop or

Irina Shklovski

2006-01-01

447

Integrating addiction treatment into primary care using mobile health technology: protocol for an implementation research study  

PubMed Central

Background Healthcare reform in the United States is encouraging Federally Qualified Health Centers and other primary-care practices to integrate treatment for addiction and other behavioral health conditions into their practices. The potential of mobile health technologies to manage addiction and comorbidities such as HIV in these settings is substantial but largely untested. This paper describes a protocol to evaluate the implementation of an E-Health integrated communication technology delivered via mobile phones, called Seva, into primary-care settings. Seva is an evidence-based system of addiction treatment and recovery support for patients and real-time caseload monitoring for clinicians. Methods/Design Our implementation strategy uses three models of organizational change: the Program Planning Model to promote acceptance and sustainability, the NIATx quality improvement model to create a welcoming environment for change, and Rogers’s diffusion of innovations research, which facilitates adaptations of innovations to maximize their adoption potential. We will implement Seva and conduct an intensive, mixed-methods assessment at three diverse Federally Qualified Healthcare Centers in the United States. Our non-concurrent multiple-baseline design includes three periods — pretest (ending in four months of implementation preparation), active Seva implementation, and maintenance — with implementation staggered at six-month intervals across sites. The first site will serve as a pilot clinic. We will track the timing of intervention elements and assess study outcomes within each dimension of the Reach, Effectiveness, Adoption, Implementation, and Maintenance framework, including effects on clinicians, patients, and practices. Our mixed-methods approach will include quantitative (e.g., interrupted time-series analysis of treatment attendance, with clinics as the unit of analysis) and qualitative (e.g., staff interviews regarding adaptations to implementation protocol) methods, and assessment of implementation costs. Discussion If implementation is successful, the field will have a proven technology that helps Federally Qualified Health Centers and affiliated organizations provide addiction treatment and recovery support, as well as a proven strategy for implementing the technology. Seva also has the potential to improve core elements of addiction treatment, such as referral and treatment processes. A mobile technology for addiction treatment and accompanying implementation model could provide a cost-effective means to improve the lives of patients with drug and alcohol problems. Trial registration ClinicalTrials.gov (NCT01963234). PMID:24884976

2014-01-01

448

African American communication research: Toward a deeper understanding of interethnic communication  

Microsoft Academic Search

This paper attempts to review the existing literature on African American communication and evaluate its productivity at increasing more effective interethnic communication. Several limitations and problems of existing literature are discussed, as they contribute to the emergence of an “universal iconography” of African American communication. These include: a narrow methodological approach, the creation of overwhelming generalizations, and the polarization of

Mark P. Orbe

1995-01-01

449

Research on English Language and Communication in Business - A Bibliography, 1988-1992.  

ERIC Educational Resources Information Center

The bibliography lists studies of English language use in business communication. The first section cites research undertaken from a language or communication perspective, and the second section contains research from a management or business viewpoint. Within each of these sections, research is divided into that dealing with written business…

Kennedy, Chris, Comp.; And Others

450

Big science or bricolage: an alternative model for research in technical communication  

Microsoft Academic Search

Two research traditions inform contemporary technical communication research. With its physical science orientation and organizational capaciousness, the tradition of Big Science originated in the laboratory of Ernest O. Lawrence. With its humanistic orientation and individualistic singularity, the tradition of bricolage was identified in the fieldwork of Claude Le´vi-Strauss. The current celebration of the former in technical communication research serves to

NANCY W. COPPOLA; NORBERT ELLIOT

2005-01-01

451

Pedagogy in Practice: Linking the Graduate Research Methods Course with Communication Theory  

Microsoft Academic Search

Over the past few years, professors in the Department of Communication Studies at West Virginia University have worked to integrate the graduate research methods course with the communication theory course. The goal is to help the students learn how theory and research are related and to help professors deal with the time management issues involved with guiding student research. The

Keith Weber; Matthew M. Martin

2006-01-01

452

Selected Research and Development Topics on Aerospace Communications at NASA Glenn Research Center  

NASA Technical Reports Server (NTRS)

This presentation discusses some of the efforts on communications RD that have been performed or are currently underway at NASA Glenn Research Center. The primary purpose of this presentation is to outline some RD topics to serve as talking points for a Technical Interchange Meeting with the Ohio State University. The meeting is scheduled to take place at The ElectroScience Laboratory of the Ohio State University on February 24, 2014.

Miranda, Felix A.; Romanofsky, Robert R.; Nessel, James A.

2014-01-01

453

Secure Group Communication for Mobile P2P Groups: A Survey  

Microsoft Academic Search

Abstract This report presents an overview over secure group communication paradigms in ad hoc networks, with especial attention to join and leave algorithms. Although classical group communication, after more than 25 years of development, is by now well understood and formalized, group communication for ad hoc networks is still under development. Firstly, the paradigm of groups in distributed computing is

Zinaida Benenson

454

A One-Pass Heuristic for Cooperative Communication in Mobile Ad Hoc Networks  

Microsoft Academic Search

Ad hoc networks have been used in the last few years to provide communications means among agents that need to accomplish common goals. Due to the importance of communication for the success of such missions, we study the problem of maximizing communication among a set of agents. As a practical tool to solve such problems, we introduce a one-pass randomized

CLAYTON W. COMMANDER; CARLOS A. S. OLIVEIRA; Panos Pardalos; Mauricio Resende

455

A proposed architecture for a satellite-based mobile communications network - The lowest three layers  

NASA Technical Reports Server (NTRS)

Architecture for a commercial mobile satellite network is proposed. The mobile satellite system (MSS) is composed of a network management center, mobile terminals, base stations, and gateways; the functions of each component are described. The satellite is a 'bent pipe' that performs frequency translations, and it has multiple UHF beams. The development of the MSS design based on the seven-layer open system interconnection model is examined. Consideration is given to the functions of the physical, data link, and network layers and the integrated adaptive mobile access protocol.

Yan, T. Y.; Naderi, F. M.

1986-01-01

456

Integration between terrestrial-based and satellite-based land mobile communications systems  

NASA Technical Reports Server (NTRS)

A survey is given of several approaches to improving the performance and marketability of mobile satellite systems (MSS). The provision of voice/data services in the future regional European Land Mobile Satellite System (LMSS), network integration between the Digital Cellular Mobile System (GSM) and LMSS, the identification of critical areas for the implementation of integrated GSM/LMSS areas, space segment scenarios, LMSS for digital trunked private mobile radio (PMR) services, and code division multiple access (CDMA) techniques for a terrestrial/satellite system are covered.

Arcidiancono, Antonio

1990-01-01

457

Journal of Intercultural Communication Research Vol. 34, No. 4, December 2005, pp 233-254  

E-print Network

Journal of Intercultural Communication Research Vol. 34, No. 4, December 2005, pp 233 of interruption in intercultural communication. Forty Chinese-Canadian dyads participated in the study which on intercultural face-to-face communication. The higher frequencies of unsuccessful interruptions displayed

Northern British Columbia, University of

458

Research in Palliative and End-of-Life Communication and Training (RESPECT) Center: Year 3  

E-print Network

of communication in palliative and end-of-life care across the lifespan. Center Goals: · Accelerate the development in the science of communication in palliative and end-of-life care. #12;Research in Palliative and End-of-Life Communication and Training (RESPECT) Center: Year 3 2012

Zhou, Yaoqi

459

Open Problems in the Emergence and Evolution of Linguistic Communication: A Road-Map for Research  

E-print Network

Open Problems in the Emergence and Evolution of Linguistic Communication: A Road-Map for Research on the emergence and evolution of human language and more simple communication systems has been increasingly problems for the understanding of the emer- gence and evolution linguistic communication, and discusses

Nehaniv, Chrystopher

460

Initial experience with a handheld device digital imaging and communications in medicine viewer: OsiriX mobile on the iPhone.  

PubMed

Medical imaging is commonly used to diagnose many emergent conditions, as well as plan treatment. Digital images can be reviewed on almost any computing platform. Modern mobile phones and handheld devices are portable computing platforms with robust software programming interfaces, powerful processors, and high-resolution displays. OsiriX mobile, a new Digital Imaging and Communications in Medicine viewing program, is available for the iPhone/iPod touch platform. This raises the possibility of mobile review of diagnostic medical images to expedite diagnosis and treatment planning using a commercial off the shelf solution, facilitating communication among radiologists and referring clinicians. PMID:20567992

Choudhri, Asim F; Radvany, Martin G

2011-04-01

461

Manufacturing consent?: Media messages in the mobilization against HIV/AIDS in India and lessons for health communication.  

PubMed

Despite repeated calls for a more critical and "culture-centered" approach to health communication, textual analysis of televised public service advertising (PSA) campaigns has been largely neglected, even by critical communication scholars. In the case of "developing" countries in particular, there is an acute shortage of such literature. On the other hand, following the outbreak of major public health diseases such as AIDS, most countries have adopted PSA campaigns as the most preferred means of communicating messages. Drawing on insights from cultural studies (especially Antonio Gramsci and Stuart Hall), this article engages in textual analysis of the televised PSA campaigns launched by the Indian state to prevent HIV/AIDS between 2002 and 2005. Through such analysis, it argues that although few diseases in Indian history have spurred such massive and creative efforts for mass mobilization as AIDS, these efforts, in terms of their ethical implications, have been far from emancipatory. In fact, they have constructed and perpetuated the logic of domination and control along class, gender, sexuality, and knowledge systems, often contradicting and potentially harming the very goal of HIV prevention and of health promotion and empowerment. This article also holds that assessing public health campaigns through textual analysis, a highly neglected tool in health communication, can shed important light on a far more complex and changing nature of the state and public policy, especially in the developing world, thereby opening up space for alternative theorizing for health communication and social change. PMID:23631645

Khan, Shamshad

2014-01-01

462

Comparative international analysis of radiofrequency exposure surveys of mobile communication radio base stations  

PubMed Central

This paper presents analyses of data from surveys of radio base stations in 23 countries across five continents from the year 2000 onward and includes over 173,000 individual data points. The research compared the results of the national surveys, investigated chronological trends and compared exposures by technology. The key findings from this data are that irrespective of country, the year and cellular technology, exposures to radio signals at ground level were only a small fraction of the relevant human exposure standards. Importantly, there has been no significant increase in exposure levels since the widespread introduction of 3G mobile services, which should be reassuring for policy makers and negate the need for post-installation measurements at ground level for compliance purposes. There may be areas close to antennas where compliance levels could be exceeded. Future potential work includes extending the study to additional countries, development of cumulative exposure distributions and investigating the possibility of linking exposure measurements to population statistics to assess the distribution of exposure levels relative to population percentiles. PMID:22377680

Rowley, Jack T; Joyner, Ken H

2012-01-01

463

A medical application integrating remote 3D visualization tools to access picture archiving and communication system on mobile devices.  

PubMed

With computing capability and display size growing, the mobile device has been used as a tool to help clinicians view patient information and medical images anywhere and anytime. However, for direct interactive 3D visualization, which plays an important role in radiological diagnosis, the mobile device cannot provide a satisfactory quality of experience for radiologists. This paper developed a medical system that can get medical images from the picture archiving and communication system on the mobile device over the wireless network. In the proposed application, the mobile device got patient information and medical images through a proxy server connecting to the PACS server. Meanwhile, the proxy server integrated a range of 3D visualization techniques, including maximum intensity projection, multi-planar reconstruction and direct volume rendering, to providing shape, brightness, depth and location information generated from the original sectional images for radiologists. Furthermore, an algorithm that changes remote render parameters automatically to adapt to the network status was employed to improve the quality of experience. Finally, performance issues regarding the remote 3D visualization of the medical images over the wireless network of the proposed application were also discussed. The results demonstrated that this proposed medical application could provide a smooth interactive experience in the WLAN and 3G networks. PMID:24705800

He, Longjun; Ming, Xing; Liu, Qian

2014-04-01

464

[Focus on current research: improving the mobility of paraplegic patients].  

PubMed

Since the first paraplegic centre was established in 1945, life expectancy and life quality of paraplegics have considerably improved. However, endeavours to enhance the mobility of these patients have been less successful. The most promising approach, functional electric stimulation of paralysed muscles, is poorly accepted by patients at present because of technical problems. This study describes current approaches which may help to improve patients' mobility. A central motor lesion is perceived by the patient as a movement disorder of the legs, e.g. a gait disorder. Neurological investigation indicates, on the basis of exaggerated tendon reflexes and increased resistance of the non-activated leg muscles to stretching, that spastic paresis underlies the movement disorder. This combination of symptoms and clinical (physical) signs suggests that the exaggerated tendon tap reflexes are responsible for muscle hypertonia and the latter causes the movement disorder. However, electromyography during movement shows that the exaggerated short latency reflexes are associated with loss or attenuation of the functionally essential polysynaptic spinal reflexes. In the event of impaired supraspinal control there is loss of monosynaptic stretch reflex inhibition combined with reduced facilitation of polysynaptic spinal reflexes. Development of tension in tonically active calf muscles in patients with spastic paresis during gait occurs independently of spinal reflex activity. From electrophysiological and histological observations it can be assumed that transformation of motor units resulting in simple and less well adapted regulation of muscle tone allows movements such as gait. The reduction of muscle tone obtained with antispastic drugs is usually associated with paresis and may therefore hamper locomotion. Locomotor training represents a new attempt to improve the mobility of patients with incomplete paraplegia. It includes activation of neuronal circuits within the spinal cord below the level of the lesion. In incomplete paraplegics a coordinated leg muscle activation pattern and corresponding leg movements can be triggered and trained in patients standing on a treadmill with partial weight support. Improvement of training of the spinal cord locomotor centre can be expected from triggering of spinal cord reflexes and regeneration of spinal tract fibres, which is expected to be possible in the near future. PMID:10893754

Dietz, V

2000-06-01

465

Research on Study Abroad, Mobility, and Student Exchange in Comparative Education Scholarship  

ERIC Educational Resources Information Center

For many years there has been research on study abroad, student mobility and international student exchange; however in the last two decades the volume and scope of this work has increased significantly. There are now specific academic journals, a host of new books each year, expansive reports by international research organizations, and an…

Streitwieser, Bernhard T.; Le, Emily; Rust, Val

2012-01-01

466

Towards the "Fifth Freedom": Increasing the Mobility of Researchers in the European Union  

ERIC Educational Resources Information Center

Many researchers trained in Europe leave to work abroad, namely in the USA. This brain-drain phenomenon is the result of a lack of openness and competition in European academic systems. Some aspects relating to the mobility of academic careers could make a difference in attracting--and maintaining--researchers, aside to serious structural reform.…

Marimon, Ramon; Lietaert, Matthieu; Grigolo, Michele

2009-01-01

467

On the 'PreHistory of the Panoptic Sort': Mobility in Market Research  

Microsoft Academic Search

This article reviews the history of market research to argue that that discipline has seen a paradigm shift during the second half of the 20th century. Originally market research developed as an integral element to the society-wide capitalist control revolution. Its aim was to contain the complexity of an increasingly mobile consumer demand in a number of pre -established categories.

Adam Arvidsson

468

Research in Brief: Using Mobile Phones to Collect Daily Experience Data from College Undergraduates  

ERIC Educational Resources Information Center

As mobile phone use and text messaging has continued to play a more central role in people's daily lives, some researchers and clinicians have sought to use the medium as a tool for interventions and data collection. Such efforts have included sending tailored health messages to college students who are trying to quit smoking. This research brief…

Ravert, Russell D.; Calix, Shaun I.; Sullivan, Michael J.

2010-01-01

469

For Immediate Release --Wednesday, October 30, 2013 University of Lethbridge researchers study if mobile app  

E-print Network

of Lethbridge researchers study if mobile app improves decision-making A research-making of these student nurses with other student nurses who do not have the app. Students without the app would typically leave the bedside and locate information

Seldin, Jonathan P.

470

Document Structure and Digital Libraries: How Researchers Mobilize Information in Journal Articles.  

ERIC Educational Resources Information Center

Explores how academic researchers disaggregate and reaggregate scientific journal articles in both print and digital environments. Analyzes data gathered in the NSF/DARPA/NASA Digital Libraries Initiative (DLI) project at the University of Illinois to describe how components are mobilized in the work of researchers as they identify, retrieve, read…

Bishop, Ann Peterson

1999-01-01

471

The Defense Advanced Research Projects Agency (DARPA) Tactical Mobile Robotics Program  

Microsoft Academic Search

Today’s regional military conflicts are increasingly likely to occur in populated urban areas, in, around, over, and under unknown buildings. This places land forces in dangerous and unpredictable situations, and in many instances the conflicts also threaten noncombatants. To address this need, the Defense Advanced Research Projects Agency (DARPA) Tactical Mobile Robotics program is researching and developing the capability to

Eric Krotkov; John Blitch

1999-01-01

472

Developing a Bidirectional Academic-Community Partnership with an Appalachian-American Community for Environmental Health Research and Risk Communication  

PubMed Central

Background: Marietta, Ohio, is an Appalachian-American community whose residents have long struggled with understanding their exposure to airborne manganese (Mn). Although community engagement in research is strongly endorsed by the National Institutes of Health and the National Institute of Environmental Health Sciences in particular, little has been documented demonstrating how an academic–community partnership that implements the community-based participatory research (CBPR) principles can be created and mobilized for research. Objectives: We created a bidirectional, academic–community partnership with an Appalachian-American community to a) identify the community’s thoughts and perceptions about local air quality, its effect on health, and the perception of risk communication sources and b) jointly develop and conduct environmental health research. Methods: We formed a community advisory board (CAB), jointly conducted pilot research studies, and used the results to develop a community-driven research agenda. Results: Persons in the community were “very concerned” to “concerned” about local air quality (91%) and perceived the air quality to have a direct impact on their health and on their children’s health (93% and 94%, respectively). The CAB identified the primary research question: “Does Mn affect the cognition and behavior of children?” Although the community members perceived research scientists as the most trusted and knowledgeable regarding risks from industrial emissions, they received very little risk information from research scientists. Conclusions: Engaging a community in environmental health research from its onset enhanced the quality and relevance of the research investigation. The CBPR principles were a useful framework in building a strong academic–community partnership. Because of the current disconnect between communities and research scientists, academic researchers should consider working collaboratively with community-based risk communication sources. PMID:21680278

Beidler, Caroline; Wittberg, Richard; Meloncon, Lisa; Parin, Megan; Kopras, Elizabeth J.; Succop, Paul; Dietrich, Kim N.

2011-01-01

473

Control of an indoor autonomous mobile communications relay via antenna diversity  

NASA Astrophysics Data System (ADS)

Presented here is a motion planning scheme for enabling a quadrotor to serve as an autonomous communications relay in indoor/GPS-denied environments. Using antenna selection diversity, the quadrotor is able to optimize its location in the communication chain so as to maximize the link throughput. Measurements of the communications field drive a gradient descent algorithm that moves the quadrotor to an optimal location while avoiding obstacles, all without the use of positioning data.

Griffin, Brian; Fierro, Rafael; Palunko, Ivana

2010-04-01

474

Patterns of Communication in a Rural Population. Research Bulletin 1095.  

ERIC Educational Resources Information Center

Patterns of communication among residents of a predominantly rural county in Ohio were analyzed in 1975 to examine behavioral and attitudinal patterns regarding mass communication systems, and to test the extent to which variations in attitudes toward mass media were a function of variations in socio-economic and demographic characteristics.…

Ross, Peggy J.; Napier, Ted L.

475

Communicating about emerging infectious disease: The importance of research  

Microsoft Academic Search

Emerging infectious diseases have taken on renewed significance in the public health sector since the 1990s. Worldwide, governments are preparing emergency plans to guide them; their plans acknowledge that communication will be vital in the event of an outbreak. However, much of the emerging infectious disease communication literature deals with one-way transmission of facts to the public by experts. Little

Bev J. Holmes

2008-01-01

476

Intercultural Communication in Foreign Language Education. Research Reports A:168.  

ERIC Educational Resources Information Center

A study examined the oral language skills needed in a second language to communicate effectively with native speakers. The first part of the study is an analysis of the concept of oral intercultural communication proficiency, particularly as an objective of language instruction. The second part of the study consisted of a survey of native speakers…

Yli-Renko, Kaarina

477

A Collection of Nonverbal Communication Research: An Annotated Bibliography.  

ERIC Educational Resources Information Center

Presents a collection of 47 entries on nonverbal communication pertinent to the business field: 1) reference works comprised of primary and secondary books, periodical reviews, and software; and 2) human nonverbal communication articles with emphasis on body movement, facial expressions, eye contact, gestures, and paralinguistics. (JMF)

Rasberry, Robert W.

1979-01-01

478

Fostering Civic Engagement in the Communication Research Methods Course  

ERIC Educational Resources Information Center

Civic engagement has become an essential learning goal for institutions throughout higher education. Communication scholars employ various pedagogical tools to foster civic engagement. For instance, service learning has been shown to increase political and community engagement in courses such as family communication and public relations. Teachers…

Liu, Min

2011-01-01

479

Mobile application for field data collection and query: Example from wildlife research (Invited)  

NASA Astrophysics Data System (ADS)

Field data collection is often used in many scientific disciplines and effective approaches rely on accurate data collection and recording. We designed a smartphone and tablet application (app) for field-collected data and tested it during a study on wildlife. The objective of our study was to determine the effectiveness of mobile applications in wildlife field research. Student software developers designed applications for mobile devices on the iOS and Android operating systems. Both platforms had similar user interactions via data entry on a touch screen using pre-programmed fields, checkboxes, drop-down menus, and keypad entry. The mobile application included features to insure collection of all measurements in the field through pop-up messages and could proof entries for valid formats. We used undergraduate student subjects to compare the duration of data recording and data entry, and the frequency of errors between the mobile application and traditional (paper) techniques. We field-tested the mobile application using an existing study on wildlife. From the field, technicians could query a database stored on a mobile device to view histories of previously captured animals. Overall, we found that because the mobile application allowed us to enter data in a digital format in the field we could eliminate timely steps to process handwritten data sheets and double-checking data entries. We estimated that, for a 2-month project, using the mobile application instead of traditional data entry and proofing reduced our total project time by 10%. To our knowledge, this is the first application developed for mobile devices for wildlife users interesting in viewing animal capture histories from the field and could be developed for use in other areas of field research.

Bateman, H.; Lindquist, T.; Whitehouse, R.

2013-12-01

480

Assessing Organizational Efforts to Mobilize Research Knowledge in Education  

ERIC Educational Resources Information Center

This paper presents a framework for evaluating efforts by organizations to share research as exemplified on their websites, then reports the result of an evaluation of these efforts in 100 organizations. The result shows that the overall research sharing efforts of these organizations are modest and not well aligned to evidence on effective…

Qi, Jie; Levin, Benjamin

2013-01-01

481

Strategies and tensions in communicating research on sexual and reproductive health, HIV and AIDS: a qualitative study of the experiences of researchers and communications staff  

PubMed Central

Background Sexual and Reproductive Health (SRH) and HIV issues are often controversial and neglected, leading to challenges with engaging policy actors. Research evidence is complex, posing further challenges for ensuring that policy and practice are evidence-based. Many health researchers are adopting innovative approaches to engaging stakeholders in their research, yet these experiences are not often shared. This qualitative study focuses on the research communication and policy influencing objectives, strategies and experiences of four research consortia working on SRH, HIV and AIDS. Methods We carried out 22 in-depth interviews with researchers and communications specialists (research actors) from the four consortia and their partners, working in nine countries in sub-Saharan Africa and Asia. Using the ‘framework’ approach to qualitative data analysis, we identified factors that affect the interaction of research evidence with policy and practice. We used the ODI RAPID analytical framework to present these results, adapting this tool by incorporating the actions, strategies and positionality of research actors. Results The characteristics of researchers and their institutions, policy context, the multiplicity of actors, and the nature of the research evidence all play a role in policy influencing processes. Research actors perceived a trend towards increasingly intensive and varied communication approaches. Effective influencing strategies include making strategic alliances and coalitions and framing research evidence in ways that are most attractive to particular policy audiences. Tensions include the need to identify and avoid unnecessary communication or unintended impacts, challenges in assessing and attributing impact and the need for adequate resources and skills for communications work. Conclusions We contend that the adapted RAPID framework can serve as a tool for research actors to use in resolving these tensions, through facilitating a reflexive approach to considering their own combination of attributes, skills, networks and objectives and the ways these relate to policy contexts, actors and processes. PMID:21679385

2011-01-01

482

Title: Societal Communication and Brand Equity Abstract: Previous research on corporate social responsibility generally acknowledges that  

E-print Network

, definitions of Corporate Social Responsibility (CSR) abound. In this research, we adopt the broad perspectiveTitle: Societal Communication and Brand Equity Abstract: Previous research on corporate social responsibility generally acknowledges that consumers develop more favourable perceptions of responsible firms

Boyer, Edmond

483

Mobile Website Overview Mobile Application Development Policy  

E-print Network

of University Communication May 29, 2012 #12;Mobile Web/Mobile App Development Policy Villanova University May .......................................................................................................................... 12 #12;Mobile Web/Mobile App Development Policy Villanova University May 29, 2012 Page 3 of 13 I accesses the mobile web. Native apps, in contrast, are permanently downloaded to mobile devices and must

Jackman, Todd

484

Using Mixed Methods from a Communicative Orientation: Researching with Grassroots Roma  

ERIC Educational Resources Information Center

Over a decade ago, researchers in Roma studies shifted their approach, from an exclusionary stance to a more communicative one. Despite major positive changes since then, researchers still do not adequately reflect the voices of the majority of the world's Roma. In this article, we draw on a communicative mixed methods case study, conducted…

Flecha, Ramon

2014-01-01

485

Communication Interaction Patterns among Members of Two International Agricultural Research Institutes.  

ERIC Educational Resources Information Center

Twenty-eight senior staff members at the Asian Vegetable Research and Development Center (AVRDC) and 60 senior staff members at the International Rice Research Institute (IRRI) were surveyed regarding the frequency and importance of their work-related face-to-face, telephone, and written communication. Analyses of the communication networks showed…

Cowell, Robert L.; Wigand, Rolf T.

486

The Westley-MacLean Model Revisited: An Extension of a Conceptual Model for Communication Research.  

ERIC Educational Resources Information Center

A revision of the Westley-MacLean model of 1957 for communication research accommodates an incorporation of some of the research areas that have blossomed during the last three decades. The revision concentrates on two aspects of the original: (1) organizational features within the advocate, communicator and audience roles; and (2) environmental…

Lacy, Stephen

487

Pointing, acquisition, and tracking considerations for mobile directional wireless communications systems  

NASA Astrophysics Data System (ADS)

High capacity directional wireless communications networks are an active research area because of their Gb/s or greater data rates over link lengths of many kilometers, providing fiber-like networks through the air. Their high data rates arise partly from their very high carrier frequencies (<60GHz for RF, and ~1550nm for free-space optical (FSO)) and partly because of their very narrow beamwidths. This second characteristic requires that transceivers be pointed precisely to their counterparts. In almost all cases this means that the transceiver aperture is mechanically pointed by a rotation stage, commonly known as a gimbal. How these platforms initially point at a target, acquire the signal, and then stay locked on the signal is known as pointing, acquisition, and tracking (PAT). Approaches for PAT in both RF and FSO have some similarities, but require overall divergent solutions, especially if the platforms are moving. This paper elaborates on the various considerations required for designing and implementing a successful PAT system for both directional RF and FSO systems. Approaches for GPS or beacon based pointing, types of acquisition scans, and the effects of platform vibration are analyzed. The acquisition time for a spiral scan of a given radius with an initial pointing error has been measured experimentally for a gimbal pointing system.

Rzasa, John; Ertem, Mehmet Can; Davis, Christopher C.

2013-09-01

488

L'IMPACT DES TECHNOLOGIES MOBILES D'INFORMATION ET DE COMMUNICATION SUR LES ACTIVITES DES PROFESSIONNELS EN ENTREPRISE  

E-print Network

Cedex 16 henri.isaac@dauphine.fr * Cette recherche a été réalisée grâce au soutien de Toshiba France dans le cadre de la Chaire HEC-Toshiba « Mobilité & Organisation » et conduite par une équipe de-Dauphine). * This research was funded by Toshiba France as an endowment of the research Chair HEC- Toshiba "Mobility

Boyer, Edmond

489

WIRELESS COMMUNICATIONS AND MOBILE COMPUTING Wirel. Commun. Mob. Comput. 2013; 13:12631280  

E-print Network

is powered by petrol or electricity, its maximum travel distance per tour is bounded. The mobile sink in wireless sen- sor networks assumed that there is a fixed base station (sink). The sensed data is relayed

Liang, Weifa

490

Relationships between Emotional States and Emoticons in Mobile Phone Email Communication in Japan  

ERIC Educational Resources Information Center

Three related studies conducted on the role of emotional transfer in email messages were studied in order to better understand Japanese college students' online communications and their broader participation in online communications. The first study investigated users' initiatives in preventing emotional misunderstandings when sending email.…

Kato, Shogo; Kato, Yuuki; Scott, Douglass

2009-01-01

491

Information\\/communication and dispatching strategies for networks with mobile servers  

Microsoft Academic Search

The dispatch problem for a network with a general number of nonstationary service units is discussed. The possibility of dispatching a service unit to a call for service while the unit is in motion depends on the quality of the information\\/communication system available. Three information\\/communication systems are investigated: two extreme cases in which only stationary units can be dispatched from

O. Berman; M. R. Rahnama

1990-01-01

492

Relationships between Emotional States and Emoticons in Mobile Phone Email Communication in Japan  

Microsoft Academic Search

Three related studies conducted on the role of emotional transfer in email messages were studied in order to better understand Japanese college students' online communications and their broader participation in online communications. The first study investigated users' initiatives in preventing emotional misunderstandings when sending email. Results showed message writers used emoticons as \\

Shogo Kato; Yuuki Kato; Douglass Scott

2009-01-01

493

Basic Research in Computer Science Aliasing Models for Mobile Objects  

E-print Network

rights reserved. Reproduction of all or part of this work is permitted for educational or research use and extended subset of Migration = Cloning ; Aliasing [HKMN99], which appeared in the Informal Proceedings

Hüttel, Hans

494

Modular, Cost-Effective, Extensible Avionics Architecture for Secure, Mobile Communications  

NASA Technical Reports Server (NTRS)

Current onboard communication architectures are based upon an all-in-one communications management unit. This unit and associated radio systems has regularly been designed as a one-off, proprietary system. As such, it lacks flexibility and cannot adapt easily to new technology, new communication protocols, and new communication links. This paper describes the current avionics communication architecture and provides a historical perspective of the evolution of this system. A new onboard architecture is proposed that allows full use of commercial-off-the-shelf technologies to be integrated in a modular approach thereby enabling a flexible, cost-effective and fully deployable design that can take advantage of ongoing advances in the computer, cryptography, and telecommunications industries.

Ivancic, William D.

2006-01-01

495

Modular, Cost-Effective, Extensible Avionics Architecture for Secure, Mobile Communications  

NASA Technical Reports Server (NTRS)

Current onboard communication architectures are based upon an all-in-one communications management unit. This unit and associated radio systems has regularly been designed as a one-off, proprietary system. As such, it lacks flexibility and cannot adapt easily to new technology, new communication protocols, and new communication links. This paper describes the current avionics communication architecture and provides a historical perspective of the evolution of this system. A new onboard architecture is proposed that allows full use of commercial-off-the-shelf technologies to be integrated in a modular approach thereby enabling a flexible, cost-effective and fully deployable design that can take advantage of ongoing advances in the computer, cryptography, and telecommunications industries.

Ivancic, William D.

2007-01-01

496

A Review of Research Methodologies Used in Studies on Mobile Handheld Devices in K-12 and Higher Education Settings  

ERIC Educational Resources Information Center

Mobile handheld devices are increasingly being used in education. In this paper, we undertook a review of empirical based articles to summarise the current research regarding the use of mobile handheld devices (personal digital assistants/PDAs, palmtops, and mobile phones) in K-12 and higher education settings. This review was guided by the…

Cheung, Wing Sum; Hew, Khe Foon

2009-01-01

497

The Ethics of Good Communication in a Complex Research Partnership  

PubMed Central

The tripartite partnership among Morehouse School of Medicine, Tuskegee University, and University of Alabama at Birmingham is complex. In 2005, the three schools—with different institutional cultures, characters, and resources—agreed to collaborate in efforts to eliminate racial/ethnic disparities in cancer burdens. Pursuing this laudable aim predictably involved some miscommunication. The Bioethics Shared Resource (BSR) group foresaw such challenges and monitored interactions to prevent harm, noting that while effective communication is critical to the achievement of mutual goals, an understanding and prudent use of proven communication principles is a sine qua non for success. In this commentary, we share the undergirding moral concepts, communication approaches, and lessons learned. This experience has led us to propose an ethics of good communication for others to consider. PMID:20675944

Sodeke, Stephen; Turner, Timothy; Tarver, Will

2013-01-01