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1

Mobile communication research in Asia: changing technological and intellectual geopolitics?  

Microsoft Academic Search

This article reviews Asian mobile communication research since the mid-1990s. First, it identifies key research institutes and funding agencies, not only in Asia but also worldwide public (e.g., the Canadian IDRC) and private (e.g., Microsoft) organizations. It then summarizes the areas of research at micro, meso, and macro levels, including their main topics, methods, and findings, and debates that result

Jack Linchuan Qiu

2010-01-01

2

Research Issues for Data Communication in Mobile Ad-Hoc Network Database Systems Leslie D. Fife, Le Gruenwald*  

E-print Network

, servers have unlimited power and communicate with mobile hosts over a wireless connection. Mobile clients of data push and data pull, but it also allows the clients to communicate directly with each other withoutResearch Issues for Data Communication in Mobile Ad-Hoc Network Database Systems Leslie D. Fife, Le

Gruenwald, Le

3

Communication Research, the Rockefeller Foundation, and Mobilization for the War on Words, 1938-1944.  

ERIC Educational Resources Information Center

Argues that Rockefeller Foundation served as an unofficial arm of the state from 1938 to 1944 by mobilizing social-scientific expertise to fight fascism when the Roosevelt Administration was politically unable to do so. Notes that Rockefeller Foundation officer John Marshall's role in the history of American mass communication research and the…

Gary, Brett

1996-01-01

4

Channel Simulation to Facilitate Mobile-Satellite Communications Research  

Microsoft Academic Search

In designing a mobile satellite network, engineers and technologists are faced with wide-ranging issues for which there is no prior database. System engineers must address such issues as adequate margin to combat multipath fading, the level of adjacent channel protection required to allow transmission in narrow-band channels, the cochannel protection required to allow for frequency reuse in a multiplebeam system,

Faramaz Davarian

1987-01-01

5

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

6

Advanced Communications Technology: Mobile Communications Requirements Report  

NASA Astrophysics Data System (ADS)

The Coast Guard's mobile communications requirements will outstrip existing system capabilities, available capacity, and affordability by the late 1990s. This will require changes in the mix of mobile communications equipment and services used by operational units. New commercial mobile satellite services are available now, with many others arriving on the market between 1998 and 2003. These new services present unique opportunities to satisfy mission requirements, reduce investment in communications infrastructure, and realize more costeffective communications services. The Coast Guard Research and Development Center (R&DC) has undertaken an effort to identify and evaluate current and emerging satellite services that may be used to satisfy Coast Guard mobile communications requirements. As part of this effort, Anteon Corporation has been tasked by R&DC to collect the mobile communications functional requirements that have been identified by program managers. Anteon analysts have reviewed the Government Furnished Information (GFI) and researched other related documentation to identify and collect the requirements that may be used to describe the needed operating environment. Anteon analysts assessed the functional requirements to develop system requirements that describe the features that a communications system must provide to support the functional requirements. This report presents the current and projected Coast Guard mobile communications system requirements.

1998-05-01

7

Mobile satellite communications  

Microsoft Academic Search

The paper presents an up-to-date overview as well as new results on mobile satellite communications. Specifically, the following subjects are addressed: worldwide activities; satellite orbits; multiple access techniques; Novstar global positioning system; economic and regulatory issues; future trends. Some of these technical and nontechnical subjects appeal disjoint, but they are unique and significant among the many facets, which effect the

W. W. Wu; E. F. Miller; W. L. Pritchard; R. L. Pickholtz

1994-01-01

8

Mobile Communications May 30, 2013  

E-print Network

Mobile Communications Program May 30, 2013 #12;Overview Background Financial Aspects Operational plans include mobile-mobile, nights & weekends Smartphones ­ 400 minute plan, includes unlimited data.98/month Unlimited text messaging can be added for $12/month Unlimited data for mobile broadband card

9

Trends in mobile satellite communication  

Microsoft Academic Search

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

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

1993-01-01

10

Enhanced emergency communication using mobile sensing and MANET  

Microsoft Academic Search

Emergency response services are often delayed due to the destruction or non-availability of the communication network. This research work proposes Mobile Adhoc NETwork (MANET) architecture integrated with mobile sensing concepts, for reviving the communication network in disaster hit areas. Mobile sensing in emergency scenarios can very well address issues like victim localization etc. and offer help in providing specific information

Maneesha V. Ramesh; Anoop Jacob; Aryadevi R. Devidas

2012-01-01

11

Telemedicine by mobile communication  

Microsoft Academic Search

We have proposed some techniques for mobile telemedicine and have verified their practical feasibility in experiments. This article presents technical considerations required to realize a practical mobile telemedicine system, techniques developed for multiple medical data transmission, and the satisfactory results of their applications to telemedicine in moving vehicles

Koichi Shimizu

1999-01-01

12

Secure Mobile IP Communication  

E-print Network

Universität Bern Vorgelegt von: Marc Danzeisen Leiter der Arbeit: Prof. Dr. Torsten Braun Forschungsgruppe networking, Sun Microsystems, Inc. 29 5.4 Comparison of the different concepts 31 6 SECMIP: A SECURED MOBILE

Braun, Torsten

13

Trends in mobile satellite communication  

NASA Astrophysics Data System (ADS)

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.

14

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

15

Mobile Communication Device Allowance Authorization Form Revised: April 2011 MOBILE COMMUNICATION DEVICE ALLOWANCE AUTHORIZATION FORM  

E-print Network

Mobile Communication Device Allowance Authorization Form Revised: April 2011 MOBILE COMMUNICATION list your CURRENT PLAN features: Mobile service provider Name: ________ Monthly Charge: $ Device.edu/policy/itc/FINAL%20Policy%20on%20Mobile%20Comm%20Devices.htm I have read the Mobile Communication Devices Policy

Dyer, Bill

16

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

17

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

18

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

19

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

20

Mobile Communication Security Controllers An Evaluation Paper  

E-print Network

wireless and fixed communications is increasingly blurred and if we consider modern Near Field Communication (NFC)2 we will see mobile phones acting as credit cards, train tickets or smart poster readers

Mayes, Keith

21

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

22

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

23

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

24

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

25

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

26

Mobile image communication using JPEG2000  

E-print Network

Mobile image communication using JPEG2000 René Rosenbaum, Heidrun Schumann University of Rostock pipeline to a single task-aligned system. To achieve this, the modern imaging standard JPEG2000 serves using JPEG2000. 1 INTRODUCTION The enthusiasm for mobile computing is still unbroken. With the ability

Rosenbaum, Rene

27

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

28

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

29

Space communications technology research in CRL  

NASA Astrophysics Data System (ADS)

This report overviews the current research of space communications technology in Communications Research Laboratory (CRL), Ministry of Posts, and Telecommunications. The Engineering Test Satellite-5 (ETS-5) project has been conducted these five years for mobile communications development. The international cooperations using ETS-5 has been performed. It describes the project of Communications and Broadcasting Engineering Test Satellite (COMETS) to be launched in 1997 for experiments of advanced mobile satellite communication and advanced broadcasting. It also mentions the project of Engineering Test Satellite-6 (ETS-6), to be launched in 1994, in which the CRL's missions of ETS-6 are the inter-satellite communication of S-band, millimeter-wave, and optical. Finally, this report describes the technologies of large antenna assembly experiment, small satellite communications, and cluster satellite briefly.

Iida, Takashi

1993-03-01

30

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

31

A Communication Architecture for an Advanced Extravehicular Mobile Unit  

NASA Technical Reports Server (NTRS)

This document describes the communication architecture for the Power, Avionics and Software (PAS) 1.0 subsystem for the Advanced Extravehicular Mobility Unit (AEMU). The following systems are described in detail: Caution Warning and Control System, Informatics, Storage, Video, Audio, Communication, and Monitoring Test and Validation. This document also provides some background as well as the purpose and goals of the PAS subsystem being developed at Glenn Research Center (GRC).

Ivancic, William D.; Sands, Obed S.; Bakula, Casey J.; Oldham, Daniel R.; Wright, Ted; Bradish, Martin A.; Klebau, Joseph M.

2014-01-01

32

Enabling Disconnected Transitive Communication in Mobile Ad Hoc Networks  

Microsoft Academic Search

Recently, mobile ad hoc computing has attracted much at- tentionintheresearchcommunity. Difierentfrommostcur- rentwirelessnetworks,mobilead-hocnetworkshavenoflxed infrastructure, all hosts are capable of movement, and the network is continuously reconstructed into multiple discon- nected clusters. In such environments, connection is unsta- ble, and communication is unpredictable. Current research mainly focuses on providing the same models of communi- cation in this environment as in flxed networks,

Xiangchuan Chen; Amy L. Murphy

2001-01-01

33

Modeling and Analysis of Mobility Management in Mobile Communication Networks  

PubMed Central

Many strategies have been proposed to reduce the mobility management cost in mobile communication networks. This paper studies the zone-based registration methods that have been adopted by most mobile communication networks. We focus on two special zone-based registration methods, called two-zone registration (2Z) and two-zone registration with implicit registration by outgoing calls (2Zi). We provide a new mathematical model to analyze the exact performance of 2Z and 2Zi. We also present various numerical results, to compare the performance of 2Zi with those of 2Z and one-zone registration (1Z), and show that 2Zi is superior to 2Z as well as 1Z in most cases. PMID:24883368

Yoon, Ji Hyun; Kim, Chesoong

2014-01-01

34

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

35

TACNET: Mobile ad hoc Secure Communications Network  

Microsoft Academic Search

On the road and during tactical maneuvers, the Blue Force must maintain situational awareness to effectively react and respond. The Tactical Network, or TacNet, is a mobile ad hoc communications network developed by Sandia National Laboratories to provide Blue Force personnel with secure access to critical data, such as real-time maps of resource positions. During development of the system, the

L. E. Riblett; J. M. Wiseman

2007-01-01

36

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

37

A living lab research approach for mobile TV  

Microsoft Academic Search

More and more, a user centered approach is adopted for information and communication technologies (ICT) innovation research. One of the recently emerging concepts within this research tradition is the so called 'living lab'. A notable example of ICT innovations is the convergence of mobile telephones and television into mobile television. Within this paper, we contend that the living lab concept

Dimitri Schuurman; Tom Evens; Lieven De Marez

2009-01-01

38

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

39

Antenna technology for advanced mobile communication systems  

NASA Technical Reports Server (NTRS)

The onboard antenna front end is the key subsystem conditioning configuration and performance of mobile communication satellites. The objectives of this paper are to demonstrate this key role and to review L-band satellite antenna technology for earth coverage and regional applications. Multibeam arrays are first discussed, then unfurlable and inflatable reflector antennas are described. These technologies are now qualified in Europe for future mobile systems, for which the optimum choice of antenna technology has been found to be the key to efficient use of spectrum and power resources.

Rammos, Emmanuel; Roederer, Antoine; Rogard, Roger

1988-01-01

40

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

41

Adaptive Beamforming in Mobile, Massively Multiuser Satellite Communications: A System  

E-print Network

Adaptive Beamforming in Mobile, Massively Multiuser Satellite Communications: A System Perspective Xiao Lei, Laura Cottatellucci, Samah A. M. Ghanem Mobile Communications Department, Eurecom, France Email: {xiao.lei; laura.cottatellucci; samah.ghanem}@eurecom.fr Abstract--We consider a Mobile Satellite

Gesbert, David

42

Advanced communications payload for mobile applications  

NASA Technical Reports Server (NTRS)

An advanced satellite payload is proposed for single hop linking of mobile terminals of all classes as well as Very Small Aperture Terminal's (VSAT's). It relies on an intensive use of communications on-board processing and beam hopping for efficient link design to maximize capacity and a large satellite antenna aperture and high satellite transmitter power to minimize the cost of the ground terminals. Intersatellite links are used to improve the link quality and for high capacity relay. Power budgets are presented for links between the satellite and mobile, VSAT, and hub terminals. Defeating the effects of shadowing and fading requires the use of differentially coherent demodulation, concatenated forward error correction coding, and interleaving, all on a single link basis.

Ames, S. A.; Kwan, R. K.

1990-01-01

43

Lens Antenna For Mobile/Satellite Communication  

NASA Technical Reports Server (NTRS)

Flat, compact antenna made of stripline elements aimed at fixed elevation angle but steered electronically in azimuth. Design simplified by maintaining fixed elevation and relying on width of beam to cover desired elevation range. Need for phase shifter at each radiating element eliminated by arranging elements in circles and feeding through stripline disks called "R-KR lenses". Used in Mobile/Satellite Service, antenna mounted on top of vehicle on Earth and used to keep transmitted and received antenna beams aimed approximately toward communication satellite.

Bodnar, D. G.; Rainer, B. K.

1988-01-01

44

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

45

Consensus in networks of mobile communicating agents  

NASA Astrophysics Data System (ADS)

Populations of mobile and communicating agents describe a vast array of technological and natural systems, ranging from sensor networks to animal groups. Here, we investigate how a group-level agreement may emerge in the continuously evolving network defined by the local interactions of the moving individuals. We adopt a general scheme of motion in two dimensions and we let the individuals interact through the minimal naming game, a prototypical scheme to investigate social consensus. We distinguish different regimes of convergence determined by the emission range of the agents and by their mobility, and we identify the corresponding scaling behaviors of the consensus time. In the same way, we rationalize also the behavior of the maximum memory used during the convergence process, which determines the minimum cognitive/storage capacity needed by the individuals. Overall, we believe that the simple and general model presented in this paper can represent a helpful reference for a better understanding of the behavior of populations of mobile agents.

Baronchelli, Andrea; Díaz-Guilera, Albert

2012-01-01

46

Cryptanalysis and improvement of quantum secure communication network protocol with entangled photons for mobile communications  

NASA Astrophysics Data System (ADS)

Recently, a communication protocol called controlled bidirectional quantum secret direct communication for mobile networks was proposed by Chou et al (2014 Mobile Netw. Appl. 19 121). We study the security of the proposed communication protocol and find that it is not secure. The controller, Telecom Company, may eavesdrop secret messages from mobile devices without being detected. Finally, we give a possible improvement of the communication protocol.

Gao, Gan

2014-12-01

47

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.

48

An HTS transceiver for third generation mobile communications  

Microsoft Academic Search

Future third-generation mobile communication systems will require improved sensitivity and selectivity to support the growth in multi-media services, increased coverage, longer talk time and larger numbers of subscribers. The paper describes a transceiver for use in mobile and personal communications base transceiver stations (BTS). Key components of the transceiver are fabricated using thin film high temperature superconductor technologies to achieve,

R. B. Greed; D. C. Voyce; D. Jedamzik; J. S. Hong; M. J. Lancaster; M. Reppel; H. J. Chaloupka; J. C. Mage; B. Marcilhac; R. Mistry; H. U. Hafner; G. Auger; W. Rebernak

1999-01-01

49

Wireless Communications Research Lab Communications Research at WVU  

E-print Network

. · Projects have been funded by NSF, NASA, DoD, and others. · There is always room for more good students who, and future work. October 26, 2009 West Virginia University Page 2 #12;Wireless Communications Research Lab West Virginia University Page 4 #12;Wireless Communications Research Lab Graduate Classes Related

Reynolds, Daryl

50

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

51

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

52

SAW based systems for mobile communications satellites  

NASA Technical Reports Server (NTRS)

Modern mobile communications satellites, such as INMARSAT 3, EMS, and ARTEMIS, use advanced onboard processing to make efficient use of the available L-band spectrum. In all of these cases, high performance surface acoustic wave (SAW) devices are used. SAW filters can provide high selectivity (100-200 kHz transition widths), combined with flat amplitude and linear phase characteristics; their simple construction and radiation hardness also makes them especially suitable for space applications. An overview of the architectures used in the above systems, describing the technologies employed, and the use of bandwidth switchable SAW filtering (BSSF) is given. The tradeoffs to be considered when specifying a SAW based system are analyzed, using both theoretical and experimental data. Empirical rules for estimating SAW filter performance are given. Achievable performance is illustrated using data from the INMARSAT 3 engineering model (EM) processors.

Peach, R. C.; Miller, N.; Lee, M.

1993-01-01

53

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

54

Asian Communication: Research, Training, Planning.  

ERIC Educational Resources Information Center

A selection of eight papers on Asian communication is presented for the purpose of alerting communication researchers to significant work being done outside of the academic community. Topics include (1) a Malaysian experience in using commercial resources for audience research, (2) a content analysis model of the Pakistani press, (3) the…

Lerner, Daniel, Ed.

55

Research in speech communication.  

PubMed Central

Advances in digital speech processing are now supporting application and deployment of a variety of speech technologies for human/machine communication. In fact, new businesses are rapidly forming about these technologies. But these capabilities are of little use unless society can afford them. Happily, explosive advances in microelectronics over the past two decades have assured affordable access to this sophistication as well as to the underlying computing technology. The research challenges in speech processing remain in the traditionally identified areas of recognition, synthesis, and coding. These three areas have typically been addressed individually, often with significant isolation among the efforts. But they are all facets of the same fundamental issue--how to represent and quantify the information in the speech signal. This implies deeper understanding of the physics of speech production, the constraints that the conventions of language impose, and the mechanism for information processing in the auditory system. In ongoing research, therefore, we seek more accurate models of speech generation, better computational formulations of language, and realistic perceptual guides for speech processing--along with ways to coalesce the fundamental issues of recognition, synthesis, and coding. Successful solution will yield the long-sought dictation machine, high-quality synthesis from text, and the ultimate in low bit-rate transmission of speech. It will also open the door to language-translating telephony, where the synthetic foreign translation can be in the voice of the originating talker. Images Fig. 1 Fig. 2 Fig. 5 Fig. 8 Fig. 11 Fig. 12 Fig. 13 PMID:7479806

Flanagan, J

1995-01-01

56

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.

57

RESEARCH COMMUNICATION Acetylation regulates  

E-print Network

high-mobility group (HMG) DNA-binding domain, and the ability to interact with Armadillo/ -catenin the effects of a noncanonical Wnt pathway to control the polarity of EMS, the common precursor of endodermal

Maduro, Morris F.

58

Research Division in Electronics Communications and Microsystems  

E-print Network

Research Division in Electronics Communications and Microsystems Activity Report 2008-2009 2010, May 17th #12;INTRODUCTION The Research Division in Electronics, Communications and Microsystems, and the Innovation Management Division. The Research Division in Electronics, Communications and Microsystems hosts

Baudoin, Geneviève

59

Multiuser acoustic communications with mobile users.  

PubMed

A multiuser receiver is developed that is capable of separating receptions from independent, mobile users whose transmissions overlap in both time and frequency. With respect to any one user's Doppler corrected signal, the other communication signals appear as multiple-access interference distributed across the Doppler dimension. A previously developed receiver composed of an adaptive time-reversal processor embedded within a successive interference cancellation framework is limited to stationary users. This paper extends the receiver to properly remove the interference from moving sources by modeling the effects of Doppler through the interference cancellation receiver. The combined receiver has the ability to remove interference in both the temporal and spatial domains, and this property is shown to be preserved even when users are in motion. When applied to data collected during a recent shallow water experiment (KAM11), the receiver is shown to be capable of separating packets in a two user system where one user is moving while the other is stationary. PMID:23363106

Cho, S E; Song, H C; Hodgkiss, W S

2013-02-01

60

Bandwidth Efficient Turbo Coding For High Speed Mobile Satellite Communications  

Microsoft Academic Search

ABSTRACT This paper describes an application of turbo codes in conjunction with 16QAM in high speed mobile satellite communications The channel characteristics, the architecture of the modem and the performance curves for the selected turbo codes are presented

Mark Rice; Paul Gray; S. Adrian Barbulescu; Wade Farrell

1997-01-01

61

Rf-Mems Components In Mobile Communication Terminal  

Microsoft Academic Search

Micro-machined passive components open new perspectives to the integration of multi-standard RF transceivers for mobile communications. The different types of components are reviewed and their potential use in transceiver architectures is outlined

Antriksh Singhal; Gaurang Gupta

2006-01-01

62

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

63

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

64

Engaging the Periphery for Visual Communication on Mobile Phones  

Microsoft Academic Search

While mobile phones have become ubiquitous instruments of communication and social interaction, they still require explicit interaction, placing high demands on attention. Engaging the periphery of users' attention offers opportunities for awareness and interaction while reducing demands on attention and risks of disruption. We explore the mobile peripheral design space with Emotipix, an application for camera phones that turns the

Lisa Cowan; William G. Griswold; Louise Barkhuus; James D. Hollan

2010-01-01

65

Near Field Communication and Bluetooth Bridge System for Mobile Commerce  

Microsoft Academic Search

This paper presents an innovation of a Near Field Communication (NFC) and Bluetooth bridge system for connecting Bluetooth enabled mobile devices to NFC enabled consumer services. Nowadays, there is an abundance of mobile phones and PDAs with Bluetooth capability in the consumer market but there are fewer devices with NFC capability. In order for NFC enabled consumer services and payment

C. Y. Leong; K. C. Ong; K. K. Tan; O. P. Gan

2006-01-01

66

Analyzing Cultural Usability of Mobile Keypad and Displays for Textual Communication in Internationalization and Localization Perspectives  

NASA Astrophysics Data System (ADS)

The aim of this paper is to identify the cultural usability aspects that need to be considered while internationalizing or localizing the interaction design of mobile keypads and displays for textual communication. The analysis is based primarily on heuristics tests, where: Hindi, Arabic and Danish mobile phones are evaluated based on assumptions of user needs, and in comparison to English. We have also referred the existing research on Chinese mobile phones to further complement our work. The study provides an insight into the much needed local-language centred approach in contrast with the current English centred approach of existing mobile keypad designs and display of text.

Orngreen, Rikke; Katre, Dinesh; Sandeep, Mulagapati

67

47th Annual Communicating Nursing Research Conference  

E-print Network

47th Annual Communicating Nursing Research Conference Taking it Global: Research, Practice of Communications and Marketing Tools, Tips, Tweets, and Talking Points: Communicating the Impact of Nursing Take "Communicating the Impact of Nursing Research," nursing communication experts Jenny Carrick from UC Davis

Schladow, S. Geoffrey

68

Secure ICT Services for Mobile and Wireless Communications: A Federated Global Identity Management Framework  

Microsoft Academic Search

The paper reports on the current research activities related to the delivery of a federated global identity management framework for provisioning secure ICT services; this represents 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

Jawed I. A. Siddiqi; Babak Akhgar; Mehrdad Naderi; Wolfgang Orth; Norbert Meyer; Miika Tuisku; Gregor Pipan; Mario López Gallego; José Alberto García; Maurizio Cecchi; Jean-noel Colin

2006-01-01

69

Stratus: Energy-Efficient Mobile Communication using Cloud Support  

E-print Network

Stratus: Energy-Efficient Mobile Communication using Cloud Support Bhavish Aggarwal Microsoft 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 proxy, Stratus employs optimizations that adapt

Rajamani, Sriram K.

70

Dynamic participation in a secure conference scheme for mobile communications  

Microsoft Academic Search

We propose a scheme to implement secure digital mobile communications. The scheme can both enable multiple users to hold a secure teleconference and also resolve the problem of allowing a participant to join dynamically or to quit a teleconference already in progress. Essentially, teleconference is a synchronous collaboration session in which participants at remote locations cooperate through wireless communications. Two

Min-Shiang Hwang

1999-01-01

71

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

72

Health communication: lessons from research.  

PubMed

In discussing the lessons learned from research in the area of health communication, focus is on basic strategic issues; the scope of health communications in terms of audience, information, education and motivation approaces and India's satellite Instructional Television Experiment (SITE). Health communication is the process by which a health idea is transferred from a source, such as a primary health center, to a receiver, community, with the intention of changing the community's behavior. This involves the formulation of specific strategies for the conduct of health and family welfare communication. In the processs of health communication, it has been a common practice in India as well as in other developing countries to depend upon a plethora of communication media. Yet, despite maximum utilization of the mass media and interpersonal channels of communication, questions remain about the efficacy of the system in bringing about change. Thus, the need to draw upon lessons from research becomes obvious. Communication effectiveness researches have concentrated on 3 basic strategic issues: the question of physical reception of messages by the audience; interpretation or understanding of messages on the part of the audience in accordance with the intention of the communicator; and effectiveness of communication on the cognitive, affective and behavioral dimensions of the audience. Innumberable researches in communication have provided several lessons which have expanded the scope of health communication. This expansion can be observed in terms of audiences reached, information disseminated, education undertaken, and motivation provided. Research has identified several distinct groups to whom specific health messages have to be addressed. These include government and political elites, health and family welfare program administrators, and the medical profession and clinical staff. Information on health needs to include both the concept of health and the pertinent ideas and facts about various health measures and available services. The innovative approach is more functional, and it tries to consider the values and attitudes of the audience that it hopes to reach. The health programs on SITE have been very well received by the rural audience in India according to several studies conducted by the various agencies. PMID:12263418

Shanmugam, A V

1981-01-01

73

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

74

: Mobility and Communication for Cooperation and Coordination  

E-print Network

and communication aspects and issues in the direct control of the devices, both singularly and seen as a whole for machine-to-machine wireless communications modelisation, simulation and evaluation of coordina- tion of the devices machine learning schemes in communication and mo- tion aware algorithms for wireless networked

Ducatelle, Frederick

75

Voice communication research evaluation system  

NASA Astrophysics Data System (ADS)

Aircraft voice communications may be degraded by a variety of sources such as electrical and/or acoustical noise, radio interference, jamming and various other forms of distraction. The Voice Communication Research and Evaluation System, located in the Biodynamics and Bioengineering Division of the Aerospace Medical Research Laboratory, has been developed for the comprehensive analysis and enhancement of operational voice communication. The basic system is comprised of a multi-station voice communication network consisting of the USAF standard aircraft intercommunication system, a standard A-19 diluter-demand oxygen regulation system and an on line computer data collection and data analysis system that displays results in real time. The system is housed in a large reverberation chamber containing a programmable sound source capable of reproducing the spectrum and level of any AF operational noise environment. Standardized voice communication effectiveness test materials are used to assess the performance of any aspect of the total voice communication link, however, emphasis is usually placed upon the performance of the aircrew members. This paper will descibe the salient features of this unique system and provide examples of its application to voice communication problems.

McKinley, R. L.

1980-05-01

76

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

77

Inferring human mobility using communication patterns.  

PubMed

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. PMID:25146347

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

2014-01-01

78

Inferring human mobility using communication patterns  

PubMed Central

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. PMID:25146347

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

2014-01-01

79

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

80

Coded Modulations for Mobile Satellite Communication Channels  

Microsoft Academic Search

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

Dojun Rhee

1995-01-01

81

Mobile satellite communications systems: Toward global personal communications  

Microsoft Academic Search

The constraints imposed by the RF environment are reviewed. An overview of present and planned mobile satellite systems is given. Present systems refer to those already in operation, while planned systems refer to those that have authority to offer the services and have either a satellite in orbit or one being built to support the systems. Future directions for mobile

John H. Lodge

1991-01-01

82

Development of a mobile satellite communication unit  

NASA Technical Reports Server (NTRS)

A compact 210(W) x 280(H) x 330(D) mm mobile terminal capable of transmitting voice and data through L-band mobile satellites is described. The Voice Codec can convert an analog voice to or from digital codes at rates of 9.6, 8 and 4.8 kb/s by an MPC algorithm. The terminal functions with a single 12 V power supplied vehicle battery. The equipment can operate at any L-band frequency allocated for mobile uses in a full duplex mode and will soon be put into a field test via Japans's ETS-V satellite.

Suzuki, Ryutaro; Ikegami, Tetsushi; Hamamoto, Naokazu; Taguchi, Tetsu; Endo, Nobuhiro; Yamamoto, Osamu; Ichiyoshi, Osamu

1988-01-01

83

Edgar Nett Mobile Computer Communication 4 Introduction  

E-print Network

, cheap, rich of applications (cameras, mobile phones, music players, smartphones etc) l and being able requires innovative input/output (speech, touch screen, Google glasses) Trend (not only regarding networks

84

Biological aspects of mobile communication fields  

Microsoft Academic Search

Our knowledge on the biological effects of RF radiation has been increasing for many decades. It has become a focus of attention because of the accelerated use of RF radiation for wireless communication over the past few years. It is fairly well established that at sufficiently high power levels, RF and microwave energy can produce deleterious biological effects. Wireless communication

James C. Lin

1997-01-01

85

Scalable, error-resilient, and high-performance video communications in mobile wireless environments  

Microsoft Academic Search

A novel mobile communications system is proposed, which provides not only effective but also efficient video access for mobile users when communicating over low-bandwidth error-prone wireless links. The middleware implemented by a mobile proxy server at the mobile support station is designed for the seamless integration of mobile users with video servers, so the specific details of the underlying protocols

Jozsef Vass; Shelley Zhuang; Xinhua Zhuang

2001-01-01

86

Mobile health-monitoring system through visible light communication.  

PubMed

Promising development in the light emitting diode (LED) technology has spurred the interest to adapt LED for both illumination and data transmission. This has fostered the growth of interest in visible light communication (VLC), with on-going research to utilize VLC in various applications. This paper presents a mobile-health monitoring system, where healthcare information such as biomedical signals and patient information are transmitted via the LED lighting. A small and portable receiver module is designed and developed to be attached to the mobile device, providing a seamless monitoring environment. Three different healthcare information including ECG, PPG signals and HL7 text information is transmitted simultaneously, using a single channel VLC. This allows for a more precise and accurate monitoring and diagnosis. The data packet size is carefully designed, to transmit information in a minimal packet error rate. A comprehensive monitoring application is designed and developed through the use of a tablet computer in our study. Monitoring and evaluation such as heart rate and arterial blood pressure measurement can be performed concurrently. Real-time monitoring is demonstrated through experiment, where non-hazardous transmission method can be implemented alongside a portable device for better and safer healthcare service. PMID:25227066

Tan, Yee-Yong; Chung, Wan-Young

2014-01-01

87

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

88

Ontology-Driven Information Retrieval System for Customers' Complaints of Mobile Communication Services  

Microsoft Academic Search

Ontology has been one of the hottest topic issues in artificial intelligence, knowledge engineering, especially in information process. In this paper, we propose an ontology-driven information retrieval (IR) system used for mining the interesting patterns in the domain of customers' complaints of mobile communication services. As the primary research of ontology model itself is about concept, properties of concept, relations

Ma Hui-nan; Wu Jiang-ning; Dang Yan-zhong

2006-01-01

89

High-speed satellite mobile communications: technologies and challenges  

Microsoft Academic Search

Central features of future 4G mobile communication systems are high-speed data transmission (up to 1 Gb\\/s) and interactive multimedia services. For effective delivery of these services, the network must satisfy some stringent QoS metrics, defined typically in terms of maximum delay and\\/or minimum throughput. Mobile satellite systems will be fully integrated with the terrestrial cellular systems to provide ubiquitous global

MOHAMED IBNKAHLA; QUAZI MEHBUBAR RAHMAN; AHMED IYANDA SULYMAN; HISHAM ABDULHUSSEIN AL-ASADY; Jun Yuan; AHMED SAFWAT

2004-01-01

90

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

91

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

92

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

93

Mobile power management for wireless communication networks  

Microsoft Academic Search

For fixed quality-of-service constraints and varying channel interference, how should a mobile node in a wireless network adjust its transmitter power so that energy consumption is minimized? Several transmission schemes are considered, and optimal solutions are obtained for channels with stationary, extraneous interference. A simple dynamic power management algorithm based on these solutions is developed. The algorithm is tested by

John M. Rulnick; Nicholas Bambos

1997-01-01

94

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

95

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

96

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

97

A satellite system for land-mobile communications in Europe  

NASA Technical Reports Server (NTRS)

There exists a great unsatisified demand for land mobile communications in Europe, particularly in sectors of business activity such as the road transport industry. This demand could best be satisfied by means of satellite-based private networks providing voice and data communications in a hub configuration. The potential market is estimated to encompass several hundred thousand road vehicles and the transmission capacity required would be several thousand channels. ESA is currently demonstrating the potential of satellite communications for this type of application, using a system called PRODAT. System studies are being performed with the aim of defining the architecture of a regional satellite system for Europe.

Bartholome, P.; Rogard, R.

1988-01-01

98

The design of static and mobile HF communication systems  

Microsoft Academic Search

The lecture deals with more specific aspects of HF communication system design arising from a previous lecture entitled HF system design principles presented as part of AGARD Lecture Series 127 in 1983. The major topics considered are: (1) the design of point-to-point systems; (2) the design of systems involving mobile terminals; (3) system control and frequency management; (4) resistance to

M. Darnell

1986-01-01

99

Communications diversity advantages for the Mobile User Objective System  

Microsoft Academic Search

The UHF radio frequency (RF) band available for the our future military Mobile User Objective System (MUOS) satellite communications system has to contend with the signal scintillation effects encountered from propagation through the ionosphere as well as multipath signals from terrestrial signal reflections that will be prominent with new handheld terminals. These effects cause signal fading which can severely degrade

Per A. Kullstam

2000-01-01

100

Structure and tie strengths in mobile communication networks  

E-print Network

Structure and tie strengths in mobile communication networks J.-P. Onnela* , J. Sarama¨ki*, J. Hyvo consequence that social networks are robust to the removal of the strong ties but fall apart after a phase transition if the weak ties are removed. We show that this coupling significantly slows the diffusion process

Iamnitchi, Adriana

101

Channel-Individual Adaptive Beamforming for Mobile Satellite Communications  

Microsoft Academic Search

A digital frequency-division multiplex demultiplexer for single channel per carrier (SCPC) signals was developed for use in a digital channel-individual beamforming network for an adaptive satellite array antenna for mobile satellite communications. The available ASIC (35000 gate functions in CMOS technology, clock rate up to 30 MHz with low power consumption) permits the separation of FDM signals comprising up to

Thomas Gebauer; Heinz G. Göckler

1995-01-01

102

Remotely controlled communication and control system for limited mobility individuals  

Microsoft Academic Search

Design improvements to a remotely controlled system for patients with limited mobility are described. This system provides communication and control of the room environment with mouse control that can be adapted to the functional need of the user. Analysis is provided on the selection and integration of components within the system as well as an overview of the simulated access

Matthew Goldman; Ettore Cervo; Alexander Melle; Bryan Wilson; Seyitriza Tigrek; Frank Agyei-Ntim; Kimberly E. Newman; Frank Barnes; Michael Blei

2011-01-01

103

Antenna arrays in mobile communications: gain, diversity, and channel capacity  

Microsoft Academic Search

Are antenna arrays in mobile communications different from arrays in other applications? The answer is yes, sometimes, and it is the purpose of this paper to explain, in a tutorial fashion, when this is the case, and what this means for path loss in link calculations. One aspect is the classical gain of an antenna, which we have to understand

J. Bach Andersen

2000-01-01

104

A Channel Sharing Scheme for Cellular Mobile Communications  

E-print Network

A Channel Sharing Scheme for Cellular Mobile Communications Xing Zhang AMPS/PCS Business Leadership, Ontario N2L 3G1 Canada ABSTRACT This paper presents a channel sharing scheme, Neighbor Cell Channel by limiting the usage of sharing channels in the inner­cell region. The channel sharing scheme achieves

Waterloo, University of

105

A Channel Sharing Scheme for Cellular Mobile Communications  

E-print Network

A Channel Sharing Scheme for Cellular Mobile Communications Xing Zhang AMPS PCS Business Leadership, Ontario N2L 3G1 Canada ABSTRACT This paper presents a channel sharing scheme, Neighbor Cell Channel by limiting the usage of sharing channels in the inner-cell region. The channel sharing scheme achieves a tra

Waterloo, University of

106

Sharing Resources In Mobile/Satellite Communications  

NASA Technical Reports Server (NTRS)

Report presents preliminary theoretical analysis of several alternative schemes for allocation of satellite resource among terrestrial subscribers of landmobile/satellite communication system. Demand-access and random-access approaches under code-division and frequency-division concepts compared.

Yan, Tsun-Yee; Sue, Miles K.

1992-01-01

107

QoS management for the next mobile communication network  

NASA Astrophysics Data System (ADS)

With convergence of network technologies, future network infrastructure will be based on IP and traditional wireless/mobile networks will also evolve inevitably to a unified all-IP mobile internet which can support voice, data and video simultaneously. But, the pattern served by IP is best effort. So IP mobility and QoS management have been the main challenges of all-IP mobile networks. Based on Mobile IP, IP QoS protocol, etc, ... The paper brings forward an end-to-end QoS management solution for the next mobile communication network, introduces a terminology of QoS Agent Server (QAS), which acts as resource manage server and participate in dynamic Service Level Specification (SLS) negotiation with mobile hosts (MH) or other QAS. Taking advantage of the mechanisms, discussed the process of QoS manage to support mobile hosts' fast handoff between cells. Additionally, adopted and self-adaptive control algorithm for non-real time service on interior nodes. Finally, conclusions are given and possible future works are described.

Wang, Hui; Lu, Jun; Yu, Jianwei; He, Feng

2004-04-01

108

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

109

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

110

Center for Information & Communications Technology ResearchCenter for Information & Communications Technology Research (CICTR)(CICTR)  

E-print Network

Electronic Exchanges & Optical Systems & RF TechnologyComputers Wireless Multimedia Communications #12;NextCenter for Information & Communications Technology ResearchCenter for Information & Communications Technology Research (CICTR)(CICTR) Dept. of Electrical EngineeringDept. of Electrical Engineering

Yener, Aylin

111

The application of mobile satellite services to emergency response communications  

NASA Technical Reports Server (NTRS)

The application of an integrated satellite/terrestrial emergency response communications system in disaster relief operations is discussed. Large area coverage communications capability, full-time availability, a high degree of mobility, plus reliability, are pointed out as criteria for an effective emergency communications system. Response time is seen as a major factor determining the possible survival and/or protection of property. These criteria, can not be met by existing communications systems and complete blackouts were experienced during the past decades caused by either interruption or destruction of existing power lines, and overload or inadequacy of remaining lines. Several emergency cases, caused by either hurricanes, tornados, or floods, during which communication via satellite was instrumental to inform rescue and relief teams, are described in detail. Seismic Risk Maps and charts of Major Tectonic Plates Earthquake Epicenters are given, and it is noted that, 35 percent of the U.S. population is living in critical areas. National and international agreements for the implementation of a satellite-aided global Search and Rescue Program is mentioned. Technological and economic breakthroughs are still needed in large multibeam antennas, switching circuits, and low cost mobile ground terminals. A pending plan of NASA to initiate a multiservice program in 1982/83, with a Land Mobile Satellite capability operating in the 806 - 890 MHz band as a major element, may help to accelerate the needed breakthroughs.

Freibaum, J.

1980-01-01

112

Frequency diversity for OFDM mobile communication via underwater acoustic channels  

NASA Astrophysics Data System (ADS)

The major constraint on the performance of orthogonal frequency division multiplexing (OFDM) based underwater acoustic (UWA) communication is to keep subcarriers orthogonal. In this paper, Doppler estimation and the respective compensation technique along with various diversity techniques were deliberated for OFDM-based systems best suited for underwater wireless information exchange. In practice, for mobile communication, adjustment and tuning of transducers in order to get spatial diversity is extremely difficult. Considering the relatively low coherence bandwidth in UWA, the frequency diversity design with the Doppler compensation function was elaborated here. The outfield experiments of mobile underwater acoustic communication (UWAC) based on OFDM were carried out with 0.17 bit/(s·Hz) spectral efficiency. The validity and the dependability of the scheme were also analyzed.

Qiao, Gang; Wang, Wei; Guo, Ran; Khan, Rehan; Wang, Yue

2012-03-01

113

Mobile Raman spectroscopy in astrobiology research.  

PubMed

Raman spectroscopy has proved to be a very useful technique in astrobiology research. Especially, working with mobile instrumentation during fieldwork can provide useful experiences in this field. In this work, we provide an overview of some important aspects of this research and, apart from defining different types of mobile Raman spectrometers, we highlight different reasons for this research. These include gathering experience and testing of mobile instruments, the selection of target molecules and to develop optimal data processing techniques for the identification of the spectra. We also identify the analytical techniques that it would be most appropriate to combine with Raman spectroscopy to maximize the obtained information and the synergy that exists with Raman spectroscopy research in other research areas, such as archaeometry and forensics. PMID:25368355

Vandenabeele, Peter; Jehli?ka, Jan

2014-12-13

114

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

115

Open Innovation in Mobile and Convergent Communications  

NASA Astrophysics Data System (ADS)

The concept of open innovation seems to be very well suited to information and communication technologies. In the first place, as in any other field, the complexity of the new technology makes it necessary for companies to use ideas, processes and inventions from other players. As in any other field, we need the collaboration of the university, of SMEs, of inventors, and of the general public.

Jiménez, José

116

The Globalstar mobile satellite system for worldwide personal communications  

NASA Astrophysics Data System (ADS)

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.

117

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

118

Monitoring heart disease and diabetes with mobile internet communications.  

PubMed

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

119

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

120

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 ...

121

The design of static and mobile HF communication systems  

NASA Astrophysics Data System (ADS)

The lecture deals with more specific aspects of HF communication system design arising from a previous lecture entitled HF system design principles presented as part of AGARD Lecture Series 127 in 1983. The major topics considered are: (1) the design of point-to-point systems; (2) the design of systems involving mobile terminals; (3) system control and frequency management; (4) resistance to interception and disruption. The lecture is intended to provide a technical framework for later lectures covering the more detailed aspects of HF communication system design.

Darnell, M.

1986-03-01

122

Near field communication: getting in touch with mobile users.  

PubMed

Near field communication is a method for sending and receiving small amounts of data across very short distances wirelessly. This technology is already available in a number of mobile devices and has many possible uses, including electronic payment, access control, and information exchange. This article will explain the basic principles of near field communication, discuss some of the ways it can be used in libraries, and explore some possible concerns with the technology. A list of resources for additional information is also included. PMID:23869639

Hoy, Matthew B

2013-01-01

123

Research Priorities in Mobile Learning: An International Delphi Study  

ERIC Educational Resources Information Center

Along with advancing mobile technologies and proliferating mobile devices and applications, mobile learning research has gained great momentum in recent years. While there have been review articles summarizing past research, studies identifying mobile learning research priorities based on experts' latest insights have been lacking. This study…

Hsu, Yu-Chang; Ching, Yu-Hui; Snelson, Chareen

2014-01-01

124

NASA's mobile satellite communications program; ground and space segment technologies  

NASA Technical Reports Server (NTRS)

This paper describes the Mobile Satellite Communications Program of the United States National Aeronautics and Space Administration (NASA). The program's objectives are to facilitate the deployment of the first generation commercial mobile satellite by the private sector, and to technologically enable future generations by developing advanced and high risk ground and space segment technologies. These technologies are aimed at mitigating severe shortages of spectrum, orbital slot, and spacecraft EIRP which are expected to plague the high capacity mobile satellite systems of the future. After a brief introduction of the concept of mobile satellite systems and their expected evolution, this paper outlines the critical ground and space segment technologies. Next, the Mobile Satellite Experiment (MSAT-X) is described. MSAT-X is the framework through which NASA will develop advanced ground segment technologies. An approach is outlined for the development of conformal vehicle antennas, spectrum and power-efficient speech codecs, and modulation techniques for use in the non-linear faded channels and efficient multiple access schemes. Finally, the paper concludes with a description of the current and planned NASA activities aimed at developing complex large multibeam spacecraft antennas needed for future generation mobile satellite systems.

Naderi, F.; Weber, W. J.; Knouse, G. H.

1984-01-01

125

Department of Mobile Communications Campus Sophia Tech  

E-print Network

, Sheng Yang, and Petros Elia 1 EURECOM's research is partially supported by its industrial members: BMW 00 81 00 Fax : (+33) 4 93 00 82 00 Email : {jinyuan.chen,petros.elia}@eurecom.fr, sheng Yang, and Petros Elia Abstract This work considers the multiuser multiple-input single-output (MISO

Gesbert, David

126

An Extended TAM for Subscribers’ Adoption of Mobile Data Services Provided by Wireless Communication Systems  

Microsoft Academic Search

Wireless communication systems are one kind of EIS (Enterprise Information Systems) for mobile carriers. One of the major\\u000a applications of wireless communication systems is to provide mobile data services to subscribers. Why do subscribers use mobile\\u000a data services? The answer is crucial to the improvement of wireless communication systems. This study applies TAM (Technology\\u000a Acceptance Model) and mobile subscriber experience

Jiayin Qi; Huaying Shu; Jianqiu Zeng

127

Automatic Mobile Vehicle for Adaptive Real-Time Communication Relay  

Microsoft Academic Search

For the currently popular WiFi networks, the problem of communication blind spots is more acute, since the access points (APs) are not placed according to a central plan. In this paper, we design an Cyber physical system (CPS) based on an automatic mobile vehicle (AMV) to guarantee the quality of service (QoS) of real-time applications in WiFi networks. When a

Hai Hu; Furong Wang; Fan Zhang; Weijia Jia; Ge Tang

2009-01-01

128

1 Edgar Nett Mobile Computer Communication SS'10 Wireless LANs  

E-print Network

) and QoS, take their time (e.g. IEEE 802.11a,g and 802.1x) Ultimate goal: Be as good as LAN's #12;3 Edgar Computer Communication SS'10 IEEE 802.11 (WLAN) Characteristics: Worldwide mostly used, available in most.g. 802.11a and g)) Bluetooth Industry standard for WPAN (adopted in 802.15) #12;5 Edgar Nett Mobile

129

Driving forces of researchers mobility  

NASA Astrophysics Data System (ADS)

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.

Gargiulo, Floriana; Carletti, Timoteo

2014-05-01

130

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

131

SUBMITTED TO IEEE TRANSACTIONS ON AUTOMATION SCIENCE AND ENGINEERING 1 Building a Communication Bridge with Mobile  

E-print Network

SUBMITTED TO IEEE TRANSACTIONS ON AUTOMATION SCIENCE AND ENGINEERING 1 Building a Communication as mobile hubs to provide communication services on-demand. This capability is especially valuable in disaster response scenarios where there is no communication infrastructure. In such scenarios, mobile hubs

Minnesota, University of

132

Towards efficient mobile M2M communications: survey and open challenges.  

PubMed

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

133

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

134

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

135

Planar array design and analysis on direction of arrival estimation for mobile communication systems   

E-print Network

The demand of wireless communication has increased significantly in the past few decades due to huge demand to deliver multimedia content instantly. The expansion of mobile content paired with affordable mobile devices ...

Sanudin, Rahmat

2014-06-30

136

Omni-directional L-band antenna for mobile communications  

NASA Technical Reports Server (NTRS)

The principle and design of an L-band omni-directional mobile communication antenna are discussed. The antenna is a circular wave guide aperture with hybrid circuits attached to higher order mode excitation. It produces polarized and symmetric two split beams in elevation. The circular waveguide is fed by eight probes with a 90 degree phase shift between their inputs. Radiation pattern characteristics are controlled by adjusting the aperture diameter and mode excitation. This antenna satisfies gain requirements as well as withstanding the harsh environment.

Kim, C. S.; Moldovan, N.; Kijesky, J.

1988-01-01

137

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

138

Channel models for satellite communication by mobile land users  

NASA Astrophysics Data System (ADS)

The paper investigates three different models for the data communication channel between satellites and land mobile stations. One model is based on the statistical description of the received-power pdf, while the other two models, the Gilbert-Elliott and a 4-state model, describe the generation of digital error patterns. Easy-to-handle methods for the determination of the parameters are given for each model. The quality of the models is demonstrated by comparing their statistical properties with those of stored link measurements in regard to block error probability density function, the gap distribution, and the packet error probability with error correction.

Cygan, Daniel; Dippold, Michael; Finkenzeller, Johann

1988-12-01

139

Propagation issues for emerging mobile and portable communications: A systems perspective  

NASA Technical Reports Server (NTRS)

The viewpoint of a system engineer regarding the format of propagation information and models suitable for the design of mobile and portable satellite communications systems for the following services: audio broadcast, two way voice, and packet data is presented. Topics covered include: propagation impairments for portable indoor reception in satellite communications systems; propagation impairments and mitigation techniques for mobile satellite communications systems; characterization of mobile satellite communications channels in the presence of roadside blockage when interleaving and FEC coding are implemented; characterization of short-term mobile satellite signal variations; and characterization of long-term signal variations.

Golshan, Nasser

1993-01-01

140

Finding Intercultural Business Communication Research Sites in Companies (Doing Research).  

ERIC Educational Resources Information Center

Describes important resources for discovering sites for communication research related to the North American Free Trade Agreement (NAFTA), to help identify appropriate companies and contact them. (SR)

Driskill, Linda; Shaw, Peggy

1994-01-01

141

Robust and Cost-Efficient Communication Based on SNMP in Mobile Networks  

NASA Astrophysics Data System (ADS)

A main challenge in the design of this mobile network is the development of dynamic routing protocols that can efficiently find routes between two communicating nodes. Multimedia streaming services are receiving considerable interest in the mobile network business. An entire mobile network may change its point of attachment to the Internet. The mobile network is operated by a basic specification to support network mobility called Network Mobility (NEMO) Basic Support. However, NEMO basic Support mechanism has some problem in continuous communication. In this paper, we propose robust and cost-efficient algorithm. And we simulate proposed method and conclude some remarks.

Ryu, Sang-Hoon; Baik, Doo-Kwon

142

Radial microstrip slotline feed network for circular mobile communications array  

NASA Technical Reports Server (NTRS)

In mobile and satellite communications there is a need for low cost and low profile antennas which have a toroidal pattern. Antennas that have been developed for mobile communications include a L-Band electronically steered stripline phased array, a Ka-Band mechanically steered elliptical reflector antenna and a Ka-Band printed dipole. In addition, a L-Band mechanically steered microstrip array, a L-Band microstrip phased array tracking antenna for mounting on a car roof and an X-Band radial line slotted waveguide antenna have been demonstrated. In the above electronically scanned printed arrays, the individual element radiates normally to the plane of the array and hence require a phase shifter to scan the beam towards the horizon. Scanning in the azimuth is by mechanical or electronic steering. An alternate approach is to mount microstrip patch radiators on the surface of a cone to achieve the required elevation angle. The array then scans in the azimuth by beam switching.

Simons, Rainee N.; Kelly, Eron S.; Lee, Richard Q.; Taub, Susan R.

1994-01-01

143

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

144

Development of novel microstrip antennas for use in mobile and wireless communication systems at Jadavpur University in the present decade  

Microsoft Academic Search

Microstrip technology has received special importance in the domain of mobile and wireless communications because of its numerous advantages like small size, light weight, polarization versatility and others. However, it still suffers from limitations in terms of several useful parameters like band width, power handling capacity etc. Researches at Jadavpur University by the authors focussed on improving the technology throughout

Samik Chakraborty; Bhaskar Gupta

2007-01-01

145

Fireworks: An Adaptive Group Communications Protocol for Mobile Ad Hoc Networks  

E-print Network

Fireworks: An Adaptive Group Communications Protocol for Mobile Ad Hoc Networks Lap Kong Law that move together. Thus, we develop Fireworks, an adaptive approach for group communications in mobile ad hoc networks. Fireworks is a hybrid two-tier multicast/broadcast pro- tocol that adapts to maintain

Krishnamurthy, Srikanth

146

A Novel Broadband Omni-Directional Circularly Polarized Antenna for Mobile Communications  

E-print Network

A Novel Broadband Omni-Directional Circularly Polarized Antenna for Mobile Communications Xulin.tentzeris@ece.gatech.edu Abstract--This paper presents a new broadband omni-directional circularly polarized (CP) antenna for mobile is achieved. Keywords-broadband antenna; circularly polarized antenna; omni-directional antenna; mobile

Tentzeris, Manos

147

Motion Prediction in Mobile Communication Systems from a Historical and Geographical Perspective  

Microsoft Academic Search

Motion prediction serves to improve quality of service for mobile hosts in mobile communication systems. Much work has been done to make motion prediction using statistical method or shadow clusters. In this study we try to attack this problem through the statistical method and ANFIS (adaptive neural-fuzzy inference system) method. In the simulation process, we generated mobile host motion pattern

Zhiwei Cen; Hong Chen; Xiaomei Liu

148

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.

149

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

150

Life Cycle Assessment of the Mobile Communication System UMTS: Towards Eco-efficient Systems (12 pp)  

Microsoft Academic Search

Goal, Scope and Background   Goal of this study is an evaluation of the environmental sustainability of the UMTS mobile communication system in Switzerland\\u000a by means of a Life Cycle Assessment (LCA). A baseline environmental impact profile across the full life cycle of the UMTS\\u000a (Universal Mobile Telecommunication System) and its predecessor, the GSM (Global System for Mobile Communication) is presented.

Mireille Faist Emmenegger; Rolf Frischknecht; Markus Stutz; Michael Guggisberg; Res Witschi; Tim Otto

2006-01-01

151

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

152

75 FR 32984 - Policy on the Retention of Supporting Documents and the Use of Electronic Mobile Communication...  

Federal Register 2010, 2011, 2012, 2013, 2014

...of electronic mobile communication/ tracking technology...of an association, business, labor union, etc...motor carrier uses Global Positioning Systems...other electronic mobile communication/tracking technology...ordinary course of its business, FMCSA has the...

2010-06-10

153

Strategies for Communication Research. Sage Annual Reviews of Communication Research, Volume 6.  

ERIC Educational Resources Information Center

Each of the three sections of this book highlights a basic concept in communication research that needs more attention, and includes individual articles that review or apply new methods for the study of social communication. The first part deals with organizational analysis and field studies, and reminds its readers that mass communication is not…

Hirsch, Paul M., Ed.; And Others

154

Communicating Qualitative Research Study Designs to Research Ethics Review Boards  

ERIC Educational Resources Information Center

Researchers using qualitative methodologies appear to be particularly prone to having their study designs called into question by research ethics or funding agency review committees. In this paper, the author considers the issue of communicating qualitative research study designs in the context of institutional research ethics review and offers…

Ells, Carolyn

2011-01-01

155

A Review of Research on Mobile Learning in Teacher Education  

ERIC Educational Resources Information Center

Mobile devices have become attractive learning devices for education. While the majority of the existing research has focused primarily on the value of mobile learning for students, researchers have recently started exploring its potentials within teacher development. The present qualitative synthesis of quantitative and qualitative research aimed…

Baran, Evrim

2014-01-01

156

Mocotos: Mobile Communications Tools for Children with Special Needs  

E-print Network

without special interventions. These children are trained in Augmentative and Alternative Communication verbally communicate, augmentative visual communications tools can enable them to get their needs met for augmentative and visual communication. We then describe a prototype Mocoto. Finally we conclude

Hayes, Gillian R.

157

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

158

A Communication Network for Educational Researchers.  

ERIC Educational Resources Information Center

Discusses application of microcomputer technology to educational research and describes the possible uses of computer networking for communication with colleagues. Focuses on the organization and structure of the Education Research Forum on CompuServe. Considers advantages and costs of networking in general and for the American Educational…

Pierce, Jean; Cooley, William W.

1985-01-01

159

Research priorities in networking and communications  

NASA Astrophysics Data System (ADS)

The NSF Division of Networking and Communications Research and Infrastructure was established in 1987, shortly after the creation of the CISE Directorate. In 1989, a workshop was convened to assess the overall program and to suggest directions for networking and communications research. A similar group reconvened in April 1992 to consider the research program in the light of the evolution of technology, to update the suggestions made by the previous workshop, to reconsider the assessment of research directions vis-a-vis research opportunities and national needs, and to evaluate the educational and research base in these areas in the U.S. This document is the report of the April 1992 workshop. The principal findings of the workshop participants are the fields of networking and communications are developing rapidly, and their importance is continually increasing; major new applications of both communications and networking have emerged in the past three years; significant research progress has occurred; important new research problems have sprung up; and funding levels are still well short of the needs of the field relative to its national importance.

1992-04-01

160

Evaluation of Ad-Hoc and Mobility Architectures using Satellite Communications  

E-print Network

Evaluation of Ad-Hoc and Mobility Architectures using Satellite Communications Thierry Gayraud1 introduce difficulties (canyons, mountains, vegetation...). In such scenarios, communications in a group may be done using ad-hoc networks principle, but the communications from one group to another can be compared

Paris-Sud XI, Université de

161

BeamSwitch: System Solution for Energy-Efficient Directional Communication on Mobile Devices  

E-print Network

1 BeamSwitch: System Solution for Energy-Efficient Directional Communication on Mobile Devices of Electrical & Computer Engineering, Rice University, Houston, TX 77005 Abstract: Directional communication has the potential to improve the energy efficiency of wireless communication without sacrificing its quality. We

Zhong, Lin

162

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

163

ID21: Communicating Development Research  

NSDL National Science Digital Library

ID21 (or Information for Development in the 21st Century) is a new Development Research reporting service sponsored by the UK Department for International Development. The goal of ID21 is to link development research and researchers directly to policymakers and development practitioners around the world. The core of the site is a searchable online collection of one-page digests "of the latest social and economic research studies across 30 key topic fields." Additional resources include summaries of current research organized by topical themes, developmental news updates, and a collection of related links. To accommodate users with slow Internet access or those who prefer e-mail, a new email newsletter titled ID21NEWS has also been created. ID21NEWS will provide short summaries of the latest updates to the site, with links to the full text.

1998-01-01

164

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

165

A New mHealth Communication Framework for Use in Wearable WBANs and Mobile Technologies.  

PubMed

Driven by the development of biomedical sensors and the availability of high mobile bandwidth, mobile health (mHealth) systems are now offering a wider range of new services. This revolution makes the idea of in-home health monitoring practical and provides the opportunity for assessment in "real-world" environments producing more ecologically valid data. In the field of insomnia diagnosis, for example, it is now possible to offer patients wearable sleep monitoring systems which can be used in the comfort of their homes over long periods of time. The recorded data collected from body sensors can be sent to a remote clinical back-end system for analysis and assessment. Most of the research on sleep reported in the literature mainly looks into how to automate the analysis of the sleep data and does not address the problem of the efficient encoding and secure transmissions of the collected health data. This article reviews the key enabling communication technologies and research challenges for the design of efficient mHealth systems. An end-to-end mHealth system architecture enabling the remote assessment and monitoring of patient's sleep disorders is then proposed and described as a case study. Finally, various mHealth data serialization formats and machine-to-machine (M2M) communication protocols are evaluated and compared under realistic operating conditions. PMID:25654718

Hamida, Sana Tmar-Ben; Hamida, Elyes Ben; Ahmed, Beena

2015-01-01

166

Adaptive digital beamforming for a CDMA mobile communications payload  

NASA Technical Reports Server (NTRS)

In recent years, Spread-Spectrum Code Division Multiple Access (CDMA) has become a very popular access scheme for mobile communications due to a variety of reasons: excellent performance in multipath environments, high scope for frequency reuse, graceful degradation near saturation, etc. In this way, a CDMA system can support simultaneous digital communication among a large community of relatively uncoordinated users sharing a given frequency band. Nevertheless, there are also important problems associated with the use of CDMA. First, in a conventional CDMA scheme, the signature sequences of asynchronous users are not orthogonal and, as the number of active users increases, the self-noise generated by the mutual interference between users considerably degrades the performance, particularly in the return link. Furthermore, when there is a large disparity in received powers - due to differences in slant range or atmospheric attenuation - the non-zero cross-correlation between the signals gives rise to the so-called near-far problem. This leads to an inefficient utilization of the satellite resources and, consequently, to a drastic reduction in capacity. Several techniques were proposed to overcome this problem, such as Synchronized CDMA - in which the signature sequences of the different users are quasi-orthogonal - and power control. At the expense of increased network complexity and user coordination, these techniques enable the system capacity to be restored by equitably sharing the satellite resources among the users. An alternative solution is presented based upon the use of time-reference adaptive digital beamforming on board the satellite. This technique enables a high number of independently steered beams to be generated from a single phased array antenna, which automatically track the desired user signal and null the unwanted interference source. In order to use a time-reference adaptive antenna in a communications system, the main challenge is to obtain a reference signal highly correlated with the desired user signal and uncorrelated with the interferences. CDMA lends itself very easily to the generation of such a reference signal, thanks to the a priori knowledge of the user's signature sequence. First, the integration of an adaptive antenna in an asynchronous CDMA system is analyzed. The adaptive antenna system can provide increased interference rejection - much higher than that afforded by the code alone - and, since CDMA is mainly interference limited, any reduction in interference converts directly and linearly into an increase in capacity. Analyses and computer simulations are presented that show how an asynchronous CDMA system incorporating adaptive beamforming can provide at least as much capacity as a synchronous system. More importantly, the proposed concept allows the near-far effect to be mitigated without requiring a tight coordination of the users in terms of transmitted power control or network synchronization. The system is extremely robust to the near-far effect because the signals reaching the satellite from directions other than that of the desired user - which are likely to have different power levels - are adaptively canceled by the antenna. Finally, a payload architecture is presented that illustrates the practical implementation of this concept. This digital payload architecture demonstrates that with the advent of high performance CMOS digital processing, the on-board implementation of complex DSP techniques - in particular Digital Beamforming - has become possible, being most attractive for Mobile Satellite Communications.

Munoz-Garcia, Samuel G.; Ruiz, Javier Benedicto

1993-01-01

167

Maintaining optimal communication chains in robotic sensor networks using mobility control  

Microsoft Academic Search

Electronic chaining is the formation, and mainte- nance, of a linked communication chain that maximizes the end- to-end throughput using a cooperative team of mobile robotic relays. For this paper, an optimal communication chain is defined using the signal-to-noise ratio (SNR) of the communication links along the chain. By using the SNR of the individual communication channels, instead of relative

Cory Dixon; Eric W. Frew

2007-01-01

168

Providing Undergraduate Research Opportunities for Communication Students: A Curricular Approach  

Microsoft Academic Search

Undergraduate research can provide transformative educational experiences and profoundly impact the teaching of communication. It is often difficult, however, to integrate undergraduate research into the communication curriculum. In this paper, we discuss the benefits of undergraduate research experiences and the challenges of teaching research methods in communication. We present a structure for incorporating a capstone undergraduate research experience into the

Rick Rodrick; Linda Dickmeyer

2002-01-01

169

Performance Evaluation of Mobile Ad Hoc Network Based Communications for Future Mobile Tele-Emergency System  

NASA Astrophysics Data System (ADS)

Sparked by awareness of the limitations to provide medical services in remote areas, researchers have perceived that developing telemedicine systems is inevitable. In most cases very remote areas and disaster struck areas lack telecommunication infrastructure. Telemedicine system operating in such areas must have advanced wireless technology supporting it in devastating situation, hence it is called as tele-emergency system. Our approach is on MANET combined with Mobile IP and MIPV6, is the basis of infrastructure for the mobile tele-emergency system. The tele-emergency system requires data, voice and video transmission in its network. In this investigation, evaluation is based on simulation of the various ITU-T standard CODECs of VoIP and video transmission over MANET using discrete event simulator NS-2. The results of simulation showed that ITU-T G723.1 worked well in the MANET environment than the other CODECs for VoIP in fixed and mobility tele-emergency environments. From the simulation of video CODEC performance evaluation, it was observed that H.263 performed to a great extent in random small scale environment and also in multiple video flow of 57.6kbps speed video transmission.

Viswacheda, D. V.; Barukang, L.; Hamid, M. Y.; Arifianto, M. S.

170

Research of intelligent recommendation for mobile reading  

NASA Astrophysics Data System (ADS)

Mobile reading is the trend of current publishing industry. Intelligent Recommendation system is useful and profitable for mobile reading platforms. Currently, intelligent recommendation systems mainly focus on news recommendation or production recommendation in e-commerce. In this paper, we designed and implemented an intelligent recommendation system based on slope one algorithm. Results show that our algorithm can help the users to find their interested books and thus greatly improve the income of mobile reading platform.

Li, Qu

2013-07-01

171

An Active K-Band Receive Slot Array for Mobile Satellite Communications  

NASA Technical Reports Server (NTRS)

An active receive slot array has been developed for operation in the downlink frequency band, 19.914-20.064 GHz, of NASA's Advanced Communication Technology Satellite (ACTS) for the ACTS Mobile Terminal (AMT) project.

Tulintseff, A. N.; Lee, K. A.; Sukamto, L. M.; Chew, W.

1994-01-01

172

13 Edgar Nett Mobile Computer Communication SS'10 Signal propagation ranges  

E-print Network

Multiplexing medium characteristics Basic schemes Amplitude Modulation (AM) Frequency Modulation (FM) Phase Modulation (PM) #12;17 Edgar Nett Mobile Computer Communication SS'10 Modulation and demodulation synchronization decision digital dataanalog demodulation radio carrier analog baseband signal 101101001 radio

173

Michigan Center for Health Communications Research  

Cancer.gov

Michigan Center for Health Communications Research Presented by: Victor J. Strecher, PhD, MPH Principal Investigator OUR GOAL Cost The goal: The goal: High efficacy High reach Cost High reach High efficacy eHealth “We are truly entering a new age

174

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. Philip Smith University Marine Biological Station Millport, Isle of Cumbrae, KA28 0EG, Scotland, United). However, little is known about the biology of M. rugosa, including fundamental life history parameters

Claverie, Thomas

175

A Survey of Routing Techniques for Mobile Communications Networks  

Microsoft Academic Search

. Mobile wireless networks pose interesting challenges for routing system design. To producefeasible routes in a mobile wireless network, a routing system must be able to accommodate roving users,changing network topology, and fluctuating link quality. We discuss the impact of node mobility and wirelesscommunication on routing system design, and we survey the set of techniques employed in or proposed forrouting

S. Ramanathan; Martha Steenstrup

1996-01-01

176

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 wireless network that is formed by a collection of mobile nodes. Each node in such network has the coverage area and reduce the number of hops. Meanwhile, we designed a new Medium Access Control (MAC

Dong, Liang

177

The Interoperability Problem: Bringing together Mobile Agents and Agent Communication Languages  

Microsoft Academic Search

Interoperability is a central issue for both the mobile agents community and the wider agents community. Unfor- tunately, the interoperability concerns are different between the two communities. As a result, inter-agent communica- tion is an issue that has been addressed in a limited man- ner by the mobile agents community. Agent communication languages (ACLs) have been developed as tools with

Yannis Labrou; Timothy W. Finin; Yun Peng

1999-01-01

178

IEEE TRANSACTIONS ON COMMUNICATIONS, VOL. 56, NO. 5, MAY 2008 743 Mobility Enhanced Smart Antenna Adaptive  

E-print Network

IEEE TRANSACTIONS ON COMMUNICATIONS, VOL. 56, NO. 5, MAY 2008 743 Mobility Enhanced Smart Antenna. Index Terms--Mobility estimation, adaptive sectoring, smart antenna, and CDMA uplink capacity. I antenna systems at base stations. While smart antenna is often associated with adaptive beam forming, our

Krishnamurthy, Vikram

179

A Low-Cost Cellular Mobile Communication System: A Hierarchical Optimization Network Resource Planning Approach  

Microsoft Academic Search

This paper deals with the optimization of the design and radio network resource planning for cellular mobile communication systems. The key element to be considered for mobile network planning is cost. A hierarchical optimization planning method (HOP) is utilized since there are so many factors like system performance, terrain features, base station parameters, and cost factors which are involved in

Qi Hao; Boon-hee Soong; Erry Gunawan; Jin-teong Ong; Cheong-Boon Soh; Li Zheng

1997-01-01

180

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

181

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

182

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

183

Mobile Agents Based Collective Communication: An Application to a Parallel Plasma Simulation  

E-print Network

application. They can also benefit social ability and inter- actions of collaborative agents. Here we present benefit social ability and interactions of collaborative agents. Mobile Agents technology has been widelyMobile Agents Based Collective Communication: An Application to a Parallel Plasma Simulation

Vlad, Gregorio

184

Structured P2P Overlay of Mobile Brokers for Realizing Publish/Subscribe Communication in VANET  

PubMed Central

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

185

Federal research and development for satellite communications  

NASA Technical Reports Server (NTRS)

A Committee on Satellite Communication (COSC) was formed under the auspices of the Space Applications Board (SAB) in order to study Federal research and development on satellite communications (SC). Discussion on whether to continue the research and development and the proper role of the Federal Government are addressed. Discussion focussed on six possible options for a Federal role in SC research and development: (1) the current NASA SC program; (2) an expanded NASA SC technology program; (3) a SC technology flight test support program; (4) an experimental SC technology flight program; (5) an experimental public service SC system program; and (6) an operational public service SC system program. Decision criteria and recommendations are presented.

1977-01-01

186

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

187

Energy-Efficient Wireless Communication based on Directional Transmission from Mobile Access  

E-print Network

1 Energy-Efficient Wireless Communication based on Directional Transmission from Mobile AccessSwitch dynamically select the best antenna during active wireless transceiving without disrupting the communication, the power amplifier (PA) is the most power-hungry component for wireless transmission. We aim

Zhong, Lin

188

Prediction of Fast Fading Mobile Radio Channels in Wideband Communication Systems  

E-print Network

Prediction of Fast Fading Mobile Radio Channels in Wideband Communication Systems Liang Dong on the performance of wireless communication systems, such that the prediction of the changing channel behaviors-frequency prediction scheme has superior performance over conducting the channel predic- tion on a single frequency. I

Dong, Liang

189

Maintaining A Free-Space-Optical Communication Link Between Two Autonomous Mobiles  

E-print Network

communication is prone to mobility. The highly directional FSO transceivers require establishment mechanical auto-tracking [7] or beam steering [8], and interference [9] and noise. Line- of-sight (LOS to not only deliver wireless communication links at optical-level speeds but also solve the wireless capacity

Yuksel, Murat

190

Towards Ubiquitous and Unlimited-capacity Communication Networks European Research in  

E-print Network

) and Korea (Wireless Broadband, 4G) are investing massively in research on 4G systems. In these frameworks support have been demonstrated. Japan, China and Korea have agreed on the CJK initiative that is aiming at a common approach towards next-generation IP networks and 4G mobile communications. In North America

Chen, Yuanzhu Peter

191

Transportation and Aging: A Research Agenda for Advancing Safe Mobility  

ERIC Educational Resources Information Center

Purpose: We review what we currently know about older driver safety and mobility, and we highlight important research needs in a number of key areas that hold promise for achieving the safety and mobility goals for the aging baby boomers and future generations of older drivers. Design and Methods: Through the use of a framework for transportation…

Dickerson, Anne E.; Molnar, Lisa J.; Eby, David W.; Adler, Geri; Bedard, Michel; Berg-Weger, Marla; Classen, Sherrilene; Foley, Daniel; Horowitz, Amy; Kerschner, Helen; Page, Oliver; Silverstein, Nina M.; Staplin, Loren; Trujillo, Leonard

2007-01-01

192

Intelligent mobility research for robotic locomotion in complex terrain  

NASA Astrophysics Data System (ADS)

The objective of the Autonomous Intelligent Systems Section of Defence R&D Canada - Suffield is best described by its mission statement, which is "to augment soldiers and combat systems by developing and demonstrating practical, cost effective, autonomous intelligent systems capable of completing military missions in complex operating environments." The mobility requirement for ground-based mobile systems operating in urban settings must increase significantly if robotic technology is to augment human efforts in these roles and environments. The intelligence required for autonomous systems to operate in complex environments demands advances in many fields of robotics. This has resulted in large bodies of research in areas of perception, world representation, and navigation, but the problem of locomotion in complex terrain has largely been ignored. 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, 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. The primary focus of the paper is to present the intelligent mobility research within the framework of the research methodology, plan and direction defined at Defence R&D Canada - Suffield. It discusses the progress and future direction of intelligent mobility research and presents the research tools, topics, and plans to address this critical research gap. 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; Beckman, Blake; Digney, Bruce; Vincent, Isabelle; Ricard, Benoit

2006-05-01

193

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 Communications for Medical Care ­ Final Report 2 21 April 2011 #12;Mobile Communications for Medical Care a study of current and future healthcare and health promotion applications, and their use in China and elsewhere

Talbot, James P.

194

A PCM-TDMA one dimensional mobile communication system using leaky coaxial cables  

NASA Astrophysics Data System (ADS)

In TDMA mobile communication systems, synchronization between a base station and mobile stations is a primary problem. This paper proposes a new mobile station synchronization scheme which does not require the propagation delay measurement or very long guard time for a one-dimensional mobile communication system using leaky coaxial cables (LCX). It shows that a large-capacity PCM-TDA mobile communication system can be realized based on the proposed synchronization scheme, and describes an application method for the train mobile communication system. Mobile station synchronization scheme, signal transmission system, and synchronization scheme between base stations are described. On the estimation of the attainable bit rate from the physical environment of the transmission paths, the required guard time length and the optimum burst length are determined, and the frame structure and the channel control method are described. To demonstrate the feasibility of the system, a signal transmission experiment using an LCX at the estimated maximum bit rate has been carried out and the possibility of high-speed pulse transmission by means of LCX has been confirmed.

Sakata, S.; Saito, T.; Inose, H.

1984-10-01

195

Maintaining Optimal Communication Chains in Robotic Sensor Networks using Mobility Control  

Microsoft Academic Search

This paper presents a decentralized mobility control algorithm for the formation and maintenance of an optimal cascaded communication\\u000a chain between a lead sensor-equipped robot and a control station, using a team of robotic vehicles acting as communication\\u000a relays in an unknown and dynamic RF environment. The gradient-based controller presented uses measurements of the signal-to-noise\\u000a ratio (SNR) field of neighbor communication

Cory Dixon; Eric W. Frew

2009-01-01

196

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

197

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

198

Network design consideration of a satellite-based mobile communications system  

NASA Technical Reports Server (NTRS)

Technical considerations for the Mobile Satellite Experiment (MSAT-X), the ground segment testbed for the low-cost spectral efficient satellite-based mobile communications technologies being developed for the 1990's, are discussed. The Network Management Center contains a flexible resource sharing algorithm, the Demand Assigned Multiple Access scheme, which partitions the satellite transponder bandwidth among voice, data, and request channels. Satellite use of multiple UHF beams permits frequency reuse. The backhaul communications and the Telemetry, Tracking and Control traffic are provided through a single full-coverage SHF beam. Mobile Terminals communicate with the satellite using UHF. All communications including SHF-SHF between Base Stations and/or Gateways, are routed through the satellite. Because MSAT-X is an experimental network, higher level network protocols (which are service-specific) will be developed only to test the operation of the lowest three levels, the physical, data link, and network layers.

Yan, T.-Y.

1986-01-01

199

Effect Size Reporting Practices in Communication Research  

Microsoft Academic Search

In recent years, reporting estimates of effect size have become more important in social and behavioral science research. Four full volumes (2003–2006) of four influential communication journals were examined. The findings show that the rate of reporting effect size was very high for some types of statistical analyses (e.g., correlation, regression), and considerably lower for others (e.g., t-test, ? test).

Shaojing Sun; Xitao Fan

2010-01-01

200

Mobility control load in future personal communication networks  

Microsoft Academic Search

Personal mobility is generally acknowledged as one of the key functions to be provided in future telecommunication networks. The processing load impact on the fixed infrastructure entities is expected to be heavy and have influence on manufactures and operators, due to its impact on respectively network architecture and dimensioning requirements. The paper applies a mobility model to the processing load

G. Colombo; L. De Martino; C. Eynard; L. Gabrielli

1993-01-01

201

Mobile teleoperator research at Savannah River Laboratory  

SciTech Connect

A Robotics Technology Group was organized at Savannah River Laboratory to employ modern automation and robotics for applications at the Savannah River site. Several industrial robots have been installed in plant processes. Other robotics systems are under development in the laboratories, including mobile teleoperators for general remote tasks and emergency response operations. This paper discusses present work on a low-cost wheeled mobile vehicle, a modular light duty manipulator arm, a large gantry telerobot system, and a high technology six-legged walking robot with a teleoperated arm.

Byrd, J S

1985-01-01

202

Knowledge Mobilization and Educational Research: Politics, Languages and Responsibilities  

ERIC Educational Resources Information Center

How can educational research have more impact? What processes of knowledge exchange are most effective for increasing the uses of research results? How can research-produced knowledge be better "mobilized" among users such as practicing educators, policy makers, and the public communities? These sorts of questions are commanding urgent attention…

Fenwick, Tara, Ed.; Farrell, Lesley, Ed.

2011-01-01

203

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 of surgery. "Using information gathered from textbooks or the mobile app, nurses an application installed on their mobile phones that contains a wealth of medical

Seldin, Jonathan P.

204

SNR-INDEPENDENT VELOCITY ESTIMATION FOR MOBILE CELLULAR COMMUNICATIONS SYSTEMS  

E-print Network

component of a mobile terminal's velocity has a linear relationship with the maximum Doppler frequency fm of a demodulated signal can also be used to estimate velocity, either directly 2], or using higher order statistics

Blostein, Steven D.

205

The Institute for Communication Research Annual Report 1975-1976.  

ERIC Educational Resources Information Center

This document summarizes projects and and research activities for the year 1975-1976 in five areas: (1) international communication, (2) health communication; (3) communication technology and public policy; (4) communication and media; and (5) information needs and uses. Specific activities discussed pertain to educational development and…

Stanford Univ., CA. Inst. for Communication Research.

206

Keep on Movin'? Research Mobility's Meanings for Italian Early-Stage Researchers  

ERIC Educational Resources Information Center

Research mobility is a core notion for the European Research Area (ERA), and a wide body of literature has focused on the factors facilitating and hindering researchers' mobility. The European discourse tends to promote mobility as a value, but to what extent is it perceived as such by researchers? What role does mobility play in career…

Carrozza, Chiara; Minucci, Sara

2014-01-01

207

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

208

Research the mobile phone operation interfaces for vision-impairment.  

PubMed

Due to the vision-impaired users commonly having difficulty with mobile-phone function operations and adaption any manufacturer's user interface design, the goals for this research are established for evaluating how to improve for them the function operation convenience and user interfaces of either mobile phones or electronic appliances in the market currently. After applying collecting back 30 effective questionnaires from 30 vision-impairment, the comments have been concluded from this research include: (1) All mobile phone manufactures commonly ignorant of the vision-impairment difficulty with operating mobile phone user interfaces; (2) The vision-impairment preferential with audio alert signals; (3) The vision-impairment incapable of mobile-phone procurement independently unless with assistance from others; (4) Preferential with adding touch-usage interface design by the vision-impairment; in contrast with the least requirement for such functions as braille, enlarging keystroke size and diversifying-function control panel. With exploring the vision-impairment's necessary improvements and obstacles for mobile phone interface operation, this research is established with goals for offering reference possibly applied in electronic appliance design and . Hopefully, the analysis results of this research could be used as data references for designing electronic and high-tech products and promoting more usage convenience for those vision-impaired. PMID:22317456

Yao, Yen-Ting; Leung, Cherng-Yee

2012-01-01

209

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

210

Ad-Hoc Communication and Localization System for Mobile Robots  

NASA Astrophysics Data System (ADS)

Robots exploring unknown territory cannot rely on fixed infrastructure for communication and localization purposes. Therefore an ad-hoc communication and localization system is required to provide such facilities. In this paper a solution for a radio based localization system is presented using a 2.4 GHz wireless radio transceiver based on Chirp Spread Spectrum (CSS) modulation, which allows distance measurements by evaluating the signal propagation delay. Using odometry data as additional information source a communication and positioning system is developed fulfilling ad-hoc demands.

Neuwinger, Bernd; Witkowski, Ulf; Rückert, Ulrich

211

The status of instruction in introductory undergraduate communication research methods  

Microsoft Academic Search

Because of the reflexive relationship between theory and research methods, students' understanding of communication is incomplete without some exposure to research methods. While graduate students traditionally receive instruction in research methods, the purpose of this study was to systematically assess whether such instruction has filtered down to the undergraduate level. A national survey found that the introductory undergraduate communication research

Lawrence R. Frey; Carl H. Botan

1988-01-01

212

Mobile Communication in Romantic Relationships: Mobile Phone Use, Relational Uncertainty, Love, Commitment, and Attachment Styles  

Microsoft Academic Search

This study examines the associations between mobile phone use and relational uncertainty, love and commitment, and attachment styles. A survey of 197 college students revealed that greater use of mobile voice calls with a romantic partner was associated with lower relational uncertainty and more love and commitment. Also, the higher the avoidance, the less the participants used voice calls, and

Borae Jin; Jorge F. Peña

2010-01-01

213

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

214

Autonomous Mobile Robot Research Using The Hermies-III Robot  

Microsoft Academic Search

This paper reports on the status and future directions in the research, development and experimental validation of intelligent control techniques for autonomous mobile robots using the HERMIES-111 robot at the Center for Engineering Systems Advanced Research (CESAR) at Oak Ridge National Laboratory (ORNL). HERMIES-I11 is the fourth robot in a series of increasingly more sophisticated and capable experimental test beds

F. G. Pin; M. Beckerman; P. F. Spelt; J. T. Robinson; C. R. Weisbin

1989-01-01

215

Outage Probability Performance in Mobile Indoor Optical Wireless Communication Environment  

E-print Network

placed on a mobile monitored patient and a base station located on the ceiling considering a one and ceiling reflections are taken into account so that the system is more accurately designed, even for low monitoring. The emitter is coupled with physiological sensors and placed on the patient. The base station

Paris-Sud XI, Université de

216

Efficient and secure keys management for wireless mobile communications  

Microsoft Academic Search

This paper presents an efficient algorithm for the secure group key management of mobile users. The most promising protocols to deal with group key management are those based on logical key hierarchy (LKH). The LKH model reduces to logarithmic size the resources needed: computation time, message exchanged, and memory space. In the framework of the LKH model, we present a

Roberto Di Pietro; Luigi V. Mancini; Sushil Jajodia

2002-01-01

217

Terrestrial mobile communication train measurements in western India  

Microsoft Academic Search

Mobile train radio measurements were conducted in the UHF band in western India with a total distance of 140 km utilizing eight track side base stations in different environments. The observed path losses deduced from signal levels were compared with those deduced from several prediction methods and their standard deviations are discussed. Path loss exponents are derived from signal levels

M. V. S. N. Prasad; Rajendra Singh

2003-01-01

218

Channel Modeling and Simulation in Satellite Mobile Communication Systems  

Microsoft Academic Search

An analog model describing signal amplitude and phase variations on shadowed satellite mobile channels is proposed. A linear combination of log-normal, Rayleigh, and Rice models is used to describe signal variations over an area with constant environment attributes while an M-state Markov chain is applied to represent environment parameter variations. Channel parameters are evaluated from the experimental data and utilized

Branka Vucetic; Jun Du

1992-01-01

219

Channel spacing in cellular FM mobile communication systems  

Microsoft Academic Search

This paper reports the results of a study considering channel spacing in a cellular FM mobile system. In the introduction, a short review of the subject is given and the essential quantities to be taken into account are outlined. Additionally some economic constraints will be considered. Following this, related propagation and laboratory experiments will be described. Then the relation between

B. Visser; K. Lalonde; G. Pomponi

1983-01-01

220

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

221

Satellite Communications for Aeronautical Applications: Recent research and Development Results  

NASA Technical Reports Server (NTRS)

Communications systems have always been a critical element in aviation. Until recently, nearly all communications between the ground and aircraft have been based on analog voice technology. But the future of global aviation requires a more sophisticated "information infrastructure" which not only provides more and better communications, but integrates the key information functions (communications, navigation, and surveillance) into a modern, network-based infrastructure. Satellite communications will play an increasing role in providing information infrastructure solutions for aviation. Developing and adapting satellite communications technologies for aviation use is now receiving increased attention as the urgency to develop information infrastructure solutions grows. The NASA Glenn Research Center is actively involved in research and development activities for aeronautical satellite communications, with a key emphasis on air traffic management communications needs. This paper describes the recent results and status of NASA Glenn's research program.

Kerczewski, Robert J.

2001-01-01

222

A Communication Protocol to Improve Fairness and Data Amount on Sensor Data Collection with a Mobile Sink  

Microsoft Academic Search

Recently, many studies exploit mobile sinks to construct large-scale databases for environmental observations or weather forecasting. Mobile sinks travel in the sensing area that sensors are deployed, collect data from each sensor, and uploads them to sensor databases. By using mobile sinks, we can reduce communication traffic and maintenance cost compared with those for wireless sensor networks (WSNs). Some methods

Wataru Seino; Tomoki Yoshihisa; Takahiro Hara; Shojiro Nishio

2010-01-01

223

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 environment of study. I. INTRODUCTION Mobile Ad Hoc Network (MANET) is a collection of wireless mobile nodes realistic and fair comparison results that more accurately advocate the pros and cons of each protocol over

Baras, John S.

224

Increased Capacity Using CDMA for Mobile Satellite Communication  

Microsoft Academic Search

The performance of a spread-spectrum CDMA (code-division multiple access) system in a mobile satellite environment is analyzed. Comparisons to single-channel-per-carrier FDMA systems are presented which show that the CDMA approach provides greater capacity. Results from computer simulations, laboratory tests, and field tests of a prototype modem are also presented. The tests results show excellent performance of the modem in the

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

1990-01-01

225

R&D of a Next Generation LEO System for Global Multimedia Mobile Satellite Communications  

NASA Astrophysics Data System (ADS)

Next-generation LEO System Research Center (NeLS) was formed in the end of 1997 as a research group under the Telecommunications Advancement Organization of Japan, in cooperation with the telecommunications operators, manufacturers, universities and governmental research organization. The aim of this project is to develop new technology for global multimedia mobile satellite communications services with a user data rate around 2Mbps for handy terminals. component of the IMT-2000, and the second generation of the big-LEO systems. In prosecuting this project, two-phase approach, phase 1 and phase 2, is considered. Phase 1 is the system definition and development of key technologies. In Phase 2, we plan to verify the developed technology in Phase 1 on space. From this year we shifted the stage to Phase 2, and are now developing the prototype of on-board communication systems for flight tests, which will be planed at around 2006. The satellite altitude is assumed to be 1200 km in order to reduce the number of satellites, to avoid the Van Allen radiation belts and to increase the minimum elevation angle. Ten of the circular orbits with 55 degree of inclination are selected to cover the earth surface from -70 to 70 degree in latitude. 12 satellites are positioned at regular intervals in each orbit. In this case, the minimum elevation angle from the user terminal can be keep more than 20 degree for the visibility of the satellite, and 15 degree for simultaneous visibility of two satellites. Then, NeLS Research Center was focusing on the development of key technologies as the phase 1 project. Four kinds of key technologies; DBF satellite antenna, optical inter-satellite link system, satellite network technology with on-board ATM switch and variable rate modulation were selected. Satellite Antenna Technology: Development of on-board direct radiating active phased array antenna with digital beam forming technology would be one of the most important breakthroughs for the satellite communication systems. Therefore, the experimental DBF network with 16 radiating elements was developed for confirming a basic signal processing performance. A/D sampled data are processed by using FPGA circuit for beam forming by real-time basis. Optical Inter-Satellite Link Technology: The inter-satellite link (ISL) technology is also important, because the inter-satellite network is essential to realize the low delay network connection for multimedia services. The optical ISL simulator was developed for the study of optical modem and optical tracking mechanism. And the sensitivity of 56 photons/bit at 10-9 of error rate has been achieved by employing the Erbium doped fiber amplifier, polarizing filter and narrow band optical filter. Coude path type, the active universal joint (AUJ) type and two flat mirror type of optical antenna mechanism were developed. Satellite Network Technology: For constructing this optical ISL ring, the utilization of wavelength division multiplexing (WDM) technology is envisaged. By applying WDM technology to the optical intra-orbital ISL, logical mesh connections can be achieved by assigning the appropriate wavelength for the links among satellites. By using inclined orbit, inter-orbital ISL connection can be keep continuously. Therefore, WDM technology is also applicable to the inter-orbital ISL network. The satellite ATM network simulator was developed in order to investigate the effect of delay fluctuation caused by the satellite constellations. This simulator works as real-time basis by using commercial ATM switches and personal computers. This simulator was installed Dijkstra's algorithm to determine satellite routing path in order to minimize the end-to-end delay time from the source terminal to the destination terminal. The satellite IP network simulator has been developed in order to evaluate the congestion of the multimedia traffic. Variable Rate Modulation Technology: Considering the propagation impairments in the mobile conditions, we employ the variable rate transmission, which maintains the communication service

Morikawa, E.; Motoyoshi, S.; Koyama, Y.; Suzuki, R.; Yasuda, Y.

2002-01-01

226

Development of superconductive microwave filters for mobile communications and filter banks  

Microsoft Academic Search

The development of superconductive microwave filters connected to the use of cooled electronics is now in the critical phase of system integration. All the different steps of filter development, design and fabrication must be controlled, reproducible and technically realisable by conventional microelectronics tools. We developed filters for mobile communications and filter banks with the goal of optimising these aspects. Lanthanum

B. Marcilhac; Y. Lemaitre; D. Mansart; J. C. Mage

1999-01-01

227

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

E-print Network

, Louisville KY 40292, USA E-mail: graham@louisville.edu James Gantt Center for Telecommunications Systems Management Murray State University 207 Industry and Technology Murray, KY 42071­3347, USA E-mail: james.gantt. and Gantt, J. (2007) `Robust and affordable mobile communications for emergency management', Int. J

Bowman, Michael

228

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

229

Low cost electronically steered antenna and receiver system for mobile satellite communications  

Microsoft Academic Search

The design, construction, and basic characteristics of an electronically steered, adaptive phased array antenna for land mobile satellite communications are described here. The antenna system includes an array of six microstrip stacked patch antennas, each one connected to an RF channel, which include a monolithic microwave\\/millimeter wave integrated circuit (MMIC) low noise amplifier and a commercial silicon monolithic I-Q modulator.

J. I. Alonso; J. M. Blas; L. E. Garcia; J. Ramos; J. de Pablos; J. Grajal; G. G. Gentili; J. Gismero; F. Perez

1996-01-01

230

The land mobile satellite communication channel-recording, statistics, and channel model  

Microsoft Academic Search

The communication channel between the MARECS satellite at 26 deg W and a cruising van was measured and recorded in European areas exhibiting satellite elevations from 13 to 43 deg. Different environments and mobile antennas were tested. Results of an extensive statistical evaluation include spectra of the fading amplitude, probability density, and distribution of the received signal power as well

Erich Lutz; Daniel Cygan; Michael Dippold; Frank Dolainsky; Wolfgang Papke

1991-01-01

231

The land mobile satellite communication channel-recording, statistics, and channel model  

Microsoft Academic Search

The communication channel between the MARECS satellite at 26°W and a cruising van was measured and recorded in European areas exhibiting satellite elevations from 13 to 43°. Different environments and mobile antennas were tested. The results of an extensive statistical evaluation include spectra of the fading amplitude; probability density, and distribution of the received signal power; and the percentage of

Erich Lutz; Daniel Cygan; Michael Dippold; Frank Dolainsky; Wolfgang Papke

1991-01-01

232

An Implanted Spherical Head Model Exposed to Electromagnetic Fields at a Mobile Communication Frequency  

Microsoft Academic Search

Can cellular phones and personal communication systems base station antennas affect the active or passive implantable medical devices adversely? Concerns over the possible harmful effects of nonionizing irradiation upon implanted medical devices have been present for many years. Key issues to address are the questions of whether mobile phones have a detrimental effect on implants, and how the interaction of

S. M. S. Reyhani; Simone A. Ludwig

2006-01-01

233

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

234

Efficient Mobile Communication Solutions for Remote Data Acquisition, Supervisory and Control Systems  

Microsoft Academic Search

Wireless technologies (mobile communications or other radiofrequency transmission methods) represent reliable and efficient solutions for remote data acquisition, supervisory and control systems. The correct selection of the proper transmission method from the wide variety of radio transmission methods and standards represents an important issue. For this reason in the firs part of this paper are presented briefly, the newest and

MARIANA JURIAN; IOAN LITA; DANIEL ALEXANDRU VISAN

2008-01-01

235

Intercarrier interference self-cancellation scheme for OFDM mobile communication systems  

Microsoft Academic Search

For orthogonal frequency-division multiplexing (OFDM) communication systems, the frequency offsets in mobile radio channels distort the orthogonality between subcarriers resulting in intercarrier interference (ICI). This paper studies an efficient ICI cancellation method termed ICI self-cancellation scheme. The scheme works in two very simple steps. At the transmitter side, one data symbol is modulated onto a group of adjacent subcarriers with

Yuping Zhao; Sven-Gustav Häggman

2001-01-01

236

Towards a Channel Allocation Scheme for SDMA-based Mobile Communication Systems  

Microsoft Academic Search

: Space Division Multiple Access (SDMA) is a new technology by whichthe capacity of existing cellular mobile communication systems can economically beincreased. Based on adaptive array antenna technology the spatial dimension of theexisting system is exploited by means of forming independent radio beams in each ofthe original channels. Operating SDMA, however, requires a suitable channel allocationscheme. In this paper we

Notker Gerlich; Michael Tangemann

1995-01-01

237

Network performance evaluations for Ku band mobile satellite communications system based on Shinkansen railroad's propagation conditions  

Microsoft Academic Search

This paper presents the network performance of our Ku band mobile satellite communications system under actual Shinkansen railroad propagation conditions. First, satellite visibility were judged by examining the obstacles obscuring the satellite in video taken by a small CCD camera with a fish-eye lens that was placed under the roof window of the Shinkansen High-Speed Multiple Inspection Train. After obtaining

Yutaka Imaizumi; Satoshi Harada; Fumiaki Nagase; Masayoshi Nakayama; Kohei Ohata; Masazumi Ueba

2005-01-01

238

SHF Cassegrain antenna with electronic beam squint tracking for high data rate mobile satellite communication systems  

Microsoft Academic Search

The design of pointing and tracking systems for vehicular antennas required for a high data rate mobile military satellite communication system is a daunting task because of its demanding requirements. Not only does the antenna have to be satellite pointed accurately towards the satellite as the vehicle moves rapidly and changes orientation, but it must also do so under scintillations

B. Rama Rao; L. P. Callahan; R. J. Davis

1994-01-01

239

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

240

Technological developments and socio-economic issues of wireless mobile communications  

Microsoft Academic Search

During the last 10 years, wireless communications can be considered as the fastest growing segment of telecommunications. In fact, mobile telephones have become an everyday accessory for hundreds of million people, and they are increasingly being used in the most developed and many developing countries in the world. Current forecasts indicate that demands for wireless access will exceed the number

Ronald Beaubrun; Samuel Pierre

2001-01-01

241

“Race Matters” in the Journal of Applied Communication Research  

Microsoft Academic Search

Social issues have been a general stimulus for communication scholarship since the inception of the field. Over time, much of this research has evolved into what is known as applied communication research. Within this article, the authors report a critical analysis of research about a particularly significant social issue: race. In particular, they analyze articles published in The Journal of

Mark P. Orbe; Brenda J. Allen

2008-01-01

242

Joint multipath-Doppler diversity in mobile wireless communications  

Microsoft Academic Search

We introduce a new approach for achieving diversity in spread-spectrum communications over fast-fading multipath channels. The RAKE receiver used in existing systems suffers from significant performance degradation due to the rapid channel variations encountered under fast fading. We show that the Doppler spread induced by temporal channel variations in fact provides another means for diversity that can be further exploited

Akbar M. Sayeed; Behnaam Aazhang

1999-01-01

243

"Going Mobile" in Business Communication at an Arabian Gulf University  

ERIC Educational Resources Information Center

In this article, we describe a project in which undergraduate business seniors at a university in the Arabian Gulf created or evaluated the chapters of an iBook as part of their final course in business communication. Students were surveyed throughout the project, and they also participated in a focus group discussion at the end. The aim was to…

Rapanta, Chrysi; Nickerson, Catherine; Goby, Valerie Priscilla

2014-01-01

244

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

245

Simulating Mobile Robots for Undergraduate Research Suranga Hettiarachchi, Eli Cohen, Timothy Willey, and Nathan Schmidt  

E-print Network

Simulating Mobile Robots for Undergraduate Research Suranga Hettiarachchi, Eli Cohen, Timothy. This paper addresses the undergraduate research experience of designing and implementing a simulated mobile (CSMM) depart- ment promotes active participation of undergraduate students in research. Our objective

Hettiarachchi, Suranga

246

Student as Communication Skills Trainer: From Research to "Concept Keys"  

ERIC Educational Resources Information Center

Although textbooks are filled with practical communication advice, many students overlook the importance of basing practical advice about communication on quality research. This oversight is important for two reasons. First, given the explosion of self-help remedies focused on communication, students should learn to distinguish between…

Bodie, Graham D.

2008-01-01

247

Perspectives on Communication and Participation in Research Notification Focus Groups.  

PubMed

Researchers are slowly acknowledging an ethical obligation to inform research participants about study findings. Research notification may help participants become aware of and manage potential health risks. Scholars and practitioners have acknowledged the need for better understanding of this process. This study investigates transcripts of focus groups conducted to gauge audience reactions to notification materials that communicate scientific research findings about occupational exposures. Focus groups are a useful way to tailor notification materials to audiences, but we caution that transmission models of communication used in risk research may obscure the full value of focus groups. The emphasis on translating scientific communication into "lay" language may overlook how scientists and lay audiences can work together to bridge differences in language, experiences, goals, and orientations toward health. This study demonstrates limitations in scientific risk communication that minimize participation in communicating science. The conclusion provides instructive insights for strengthening the process of communicating science. PMID:25296941

Zoller, Heather M; Fujishiro, Kaori; Mobley, Amy; Lehman, Everett

2014-10-01

248

Stochastic Differential Equations for Modeling, Estimation and Identification of Mobile-to-Mobile Communication Channels  

SciTech Connect

Mobile-to-mobile networks are characterized by node mobility that makes the propagation environment time varying and subject to fading. As a consequence, the statistical characteristics of the received signal vary continuously, giving rise to a Doppler power spectral density (DPSD) which varies from one observation instant to the next. The current models do not capture and track the time varying characteristics. This paper is concerned with dynamical modelling of mobile-to-mobile channels, parameter estimation and identification from received signal measurements. The evolution of the propagation environment is described by stochastic differential equations. In particular, it is shown that the parameters of the models can be determined by approximating the band-limited DPSD using the Gauss-Newton method. However, since the DPSD is not available online, we propose to use a filter-based expectation maximization algorithm and Kalman filter to estimate the channel parameters and states, respectively. The scheme results in a finite dimensional filter which only uses the first and second order statistics. The algorithm is recursive allowing the inphase and quadrature components and parameters to be estimated online from received signal measurements. The algorithms are tested using experimental data collected from moving sensor nodes in indoor and outdoor environments demonstrating the method s viability.

Olama, Mohammed M [ORNL; Djouadi, Seddik M [ORNL; Charalambous, Prof. Charalambos [University of Cyprus

2009-01-01

249

Implementation of LSCMA adaptive array terminal for mobile satellite communications  

NASA Astrophysics Data System (ADS)

This paper considers the application of adaptive array antenna based on the least squares constant modulus algorithm (LSCMA) for interference rejection in mobile SATCOM terminals. A two-element adaptive array scheme is implemented with a combination of ADI TS201S DSP chips and Altera Stratix II FPGA device, which makes a cooperating computation for adaptive beamforming. Its interference suppressing performance is verified via Matlab simulations. Digital hardware system is implemented to execute the operations of LSCMA beamforming algorithm that is represented by an algorithm flowchart. The result of simulations and test indicate that this scheme can improve the anti-jamming performance of terminals.

Zhou, Shun; Wang, Huali; Xu, Zhijun

2007-11-01

250

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

251

An Integrated Routing and Scheduling Approach for Persistent Vehicle Communication in Mobile WiMAX Mesh Networks  

Microsoft Academic Search

The U.S. military has recently announced plans to evaluate the IEEE 802.16e Mobile WiMAX technology's potentials as a fast deployable solution for building a broadband tactical communication network. Specifically, the technology's provisions of mesh mode operation and terminal mobility allow a tactical network to be quickly deployed among mobile base stations and mobile battle units. The technology provides essential support

Rahul Amin; Kuang-Ching Wang; Parmesh Ramanathan

2007-01-01

252

Requirements for a mobile communications satellite system. Volume 2: Technical report  

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 obiquitous 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.

Horstein, M.

1983-01-01

253

Intercultural Communication Competence: Some Perspectives of Research.  

ERIC Educational Resources Information Center

A discussion of intercultural communicative competence (ICC) conceptualizes ICC based on a review of the literature, details its major components and related propositions, and considers problems in and prospects for, the study of ICC. The literature of both intercultural communication and of communicative competence are examined for commonalities,…

Chen, Guo-Ming

254

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

255

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

256

Augmented Learning: Research and Design of Mobile Educational Games  

ERIC Educational Resources Information Center

New technology has brought with it new tools for learning, and research has shown that the educational potential of video games resonates with scholars, teachers, and students alike. In "Augmented Learning", Eric Klopfer describes the largely untapped potential of mobile learning games--games played on such handheld devices as cell phones, Game…

Klopfer, Eric

2008-01-01

257

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

258

MEASURE AND MOBILE-MEASURE MODELS - RESEARCH/OPERATION/SUPPORT  

EPA Science Inventory

EPA's Office of Research and Development (ORD) has been working in cooperation with the Georgia Institute of Technology, EPA's Office of Transportation and Air Quality (OTAQ), and the Federal Highway Administration to develop a new concept in mobile source emissions modeling. Thi...

259

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

260

Future mobile satellite communication concepts at 20/30 GHz  

NASA Technical Reports Server (NTRS)

The outline of a design of a system using ultra small earth stations (picoterminals) for data traffic at 20/30 GHz is discussed. The picoterminals would be battery powered, have an RF transmitter power of 0.5 W, use a 10 cm square patch antenna, and have a receiver G/T of about -8 dB/K. Spread spectrum modulation would be required (due to interference consideration) to allow a telex type data link (less than 200 bit/s data rate) from the picoterminal to the hub station of the network and about 40 kbit/s on the outbound patch. An Olympus type transponder at 20/30 GHz could maintain several thousand simultaneous picoterminal circuits. The possibility of demonstrating a picoterminal network with voice traffic using Olympus is discussed together with fully mobile systems based on this concept.

Barton, S. K.; Norbury, J. R.

1990-01-01

261

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

262

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

263

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

264

Professional communication in an applied tourism research community  

Microsoft Academic Search

This study addresses the amorphous nature and complexity of professional communication in an applied tourism research community. With empirical data from members of the Travel and Tourism Research Association, the study examines professional communication from the perspectives of academic versus practitioner members. Results of the study contribute to discussions on the two-community theory and utilization theories with respect to the

Honggen Xiao; Stephen L. J. Smith

2010-01-01

265

Research in the Communication Arts and Sciences: A Review.  

ERIC Educational Resources Information Center

The articles in this journal, originally presented at the Speech Communication Association Convention in 1978, reflect the current trends and state of research in the field of speech communication. Based on information selected from publications, theses, dissertations, and convention programs, the 12 articles discuss research in the following…

Hall, Robert N., Ed.

1979-01-01

266

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

267

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

268

48 CFR 206.302-3 - Industrial mobilization, engineering, developmental, or research capability, or expert services.  

Code of Federal Regulations, 2014 CFR

...2014-10-01 2014-10-01 false Industrial mobilization, engineering, developmental, or research capability...and Open Competition 206.302-3 Industrial mobilization, engineering, developmental, or research...

2014-10-01

269

48 CFR 206.302-3 - Industrial mobilization; or engineering, development, or research capability.  

Code of Federal Regulations, 2011 CFR

...2011-10-01 2011-10-01 false Industrial mobilization; or engineering, development, or research capability...and Open Competition 206.302-3 Industrial mobilization; or engineering, development, or research...

2011-10-01

270

48 CFR 206.302-3 - Industrial mobilization; or engineering, development, or research capability.  

Code of Federal Regulations, 2010 CFR

...2010-10-01 2010-10-01 false Industrial mobilization; or engineering, development, or research capability...and Open Competition 206.302-3 Industrial mobilization; or engineering, development, or research...

2010-10-01

271

48 CFR 206.302-3 - Industrial mobilization; or engineering, development, or research capability.  

Code of Federal Regulations, 2012 CFR

...2012-10-01 2012-10-01 false Industrial mobilization; or engineering, development, or research capability...and Open Competition 206.302-3 Industrial mobilization; or engineering, development, or research...

2012-10-01

272

48 CFR 206.302-3 - Industrial mobilization, engineering, developmental, or research capability, or expert services.  

Code of Federal Regulations, 2013 CFR

...2013-10-01 2013-10-01 false Industrial mobilization, engineering, developmental, or research capability...and Open Competition 206.302-3 Industrial mobilization, engineering, developmental, or research...

2013-10-01

273

Federal Research and Development for Satellite Communications.  

ERIC Educational Resources Information Center

This report of the Committee on Satellite Communications (COSC) reviews a number of future communication needs which could be satisfied by satellite systems, including needs in fields such as education, health care delivery, hazard warning, navigation aids, search and rescue, electronic mail delivery, time and frequency dissemination, and…

National Academy of Sciences - National Research Council, Washington, DC. Assembly of Engineering.

274

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

275

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

276

An advanced conceptual design study for a mobile satellite communications system  

NASA Astrophysics Data System (ADS)

It is pointed out that a vast portion of the land mass, and a significant portion of the U.S. population in rural and remote areas, are deprived of most of the advanced telecommunication services offered in metropolitan areas. For the last decade, investigations have been conducted regarding the feasibility to provide telecommunication services throughtout the thinly populated areas with the aid of a geostationary satellite. The considered communication services are related to mobile and thin-route radiotelephony, wideband and narrowband data transmissions, and position location services. The mobile satellite (MSAT) communications system studied could provide a truly national and ubiquitous service. Attention is given to satellite antenna design, an MSAT link design analysis, and analysis results.

Salmasi, A. B.

277

DCCPS: HCIRB: CECCR: Centers of Excellence in Cancer Communication Research at The Cancer Research Network Cancer Communication Research Center  

Cancer.gov

Along with administrative core funding, four research projects were awarded as part of the center’s establishment. In addition, a Discovery Core was funded with the goal of identifying, documenting, and assessing clinical innovations in cancer communication. This Discovery Core was then paired with a Dissemination Core to accelerate the spread of effective practices, programs, and organizational policies into health care systems.

278

Wimax - Potential Commercial Off-The-Shelf Solution for Tactical Mobile Mesh Communications  

Microsoft Academic Search

The Army is evaluating the capabilities' of emerging technologies based on the IEEE 802.16 standard as a potential commercial off-the-shelf solution to support the communication requirements of the future warfighter. This paper evaluates the mesh mode defined in the IEEE 802.16d (fixed WiMax) standard to determine if it is technically feasible for WiMax to support mobile mesh networking by proposing

M. B. K. Hartzog; Timothy X Brown

2006-01-01

279

Mobile and Personal Communications in the 60 GHz Band: A Survey  

Microsoft Academic Search

This paper intends to present a summary of the technical issues arising in the exploitation of the 60 GHz mm-wave band for mobile and personal communications. The most significant applications proposed so far are surveyed, with particular emphasis placed on recent experimentation about millimeter-wave propagation for road\\/railway transportation as well as indoor scenarios. As a case study, the capacity of

Filippo Giannetti; Marco Luise; Ruggero Reggiannini

1999-01-01

280

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

281

Convolutionally interleaved PSK and DPSK trellis codes for shadowed, fast fading mobile satellite communication channels  

Microsoft Academic Search

Using a model from the literature, the performance of convolutionally interleaved phase-shift-keying (PSK) and differential phase-shift-keying (DPSK) trellis codes for digital speech transmission over shadowed mobile satellite communication channels is determined by computer simulation. First the characteristics of fading channels are examined and analyzed in terms of the probability distributions of amplitude, phase, and burst errors. A statistical method, using

A. C. M. Lee; PETER J. McLANE

1990-01-01

282

PSK and DPSK trellis codes for fast fading, shadowed mobile satellite communication channels  

Microsoft Academic Search

The performance of 8-PSK and 8-DPSK trellis codes is presented for a class of fast fading, land mobile satellite communication channels. The fading model is Rician but, in addition, the line-of-sight path is subjected to a fast lognormal attenuation that represents tree shadowing. The fading parameters used in this study represent the degree of shadowing and are based on measured

P. J. McLane; P. H. Wittke; P. K.-M. Ho; C. Loo

1988-01-01

283

Dual-band circularly polarized equilateral triangular-patch array antenna for mobile satellite communications  

Microsoft Academic Search

The Japan Aerospace Exploration Agency will launch the Engineering Test Satellite VIII (ETS-VIII) in 2006 to support the next generation of mobile satellite communications covering the area of Japan (beam coverage El=38° to 58°). In this paper, a satellite-tracking left-handed circularly polarized triangular-patch array antenna is developed for ground applications. The targeted minimum gain of the antenna is set to

J. T. S. Sumantyo; K. Ito; M. Takahashi

2005-01-01

284

Power-efficient directional wireless communication on small form-factor mobile devices  

Microsoft Academic Search

Wireless access is known to be power-hungry for mobile devices. A key reason is that devices radiate power in all directions and much of this power will not reach the destination. To address this waste, we present BeamSwitch, a multi-antenna system designed to realize directional communication efficiently. Unlike power-hungry and expensive beamforming, BeamSwitch requires only one transceiver. We provide an

Ardalan Amiri Sani; Hasan Dumanli; Lin Zhong; Ashutosh Sabharwal

2010-01-01

285

Patient-Provider Communications in Outpatient Clinic Settings: A Clinic-Based Evaluation of Mobile Device and Multimedia Mediated Communications for Patient Education  

PubMed Central

Background Many studies have provided evidence of the importance of quality provider-patient communications and have suggested improvements to patient understanding by using video-based instruction. Objective The objective of this study was to understand how mobile information technology assisted video and three-dimensional (3D) image instruction, provided by a health care worker, influences two categories of outcome: (1) patient understanding of information about their condition and detailed medical discharge instructions; and (2) patient perceptions and attitudes toward their health care providers, which included physicians, nurses, and staff. We hypothesize that video and 3D image instruction, provided on a mobile, tablet hardware platform, will improve patient understanding about the diagnostic testing, diagnoses, procedures, medications, and health topics provided to them. We also propose that use of the tablet/video combination will result in improved attitudinal evaluation by patients of their providers and the treatment plan. Methods This study evaluated a hospital clinic-based trial (patient N=284) of video and 3D image instruction, provided on a mobile, tablet hardware platform, and its potential to improve patient understanding about the diagnostic testing, diagnoses, procedures, medications, and health topics provided to them. Results Results showed strong evidence that the system was perceived as helpful for improving patient understanding, and that it improved communication between physicians and patients (P<.001). The advanced age of some patients had no effect on their perceptions of the tablet-based mediation. Physician comments provided useful insights on effective use of such systems in the future. Implications for further development and future research are discussed. Conclusions This study added to the body of evidence that computer-assisted video instructional systems for patients can improve patient understanding of medical instructions from their health care providers and assist with patient compliance. In addition, such systems can be appealing to both patient and provider. PMID:25583145

Schooley, Benjamin; San Nicolas-Rocca, Tonia

2015-01-01

286

Language and Communication in Cross-Cultural Qualitative Research  

Microsoft Academic Search

Language and communication are the bedrock of qualitative enquiry. Language is a fundamental tool through which qualitative\\u000a researchers seek to understand human behaviour, social processes and the cultural meanings that inscribe human behaviour.\\u000a However, when conducting cross-cultural research, issues of language and communication become more complex and often require\\u000a the assistance of interpreters\\/translators as “cultural brokers”. Cross-cultural research poses numerous

Monique M. Hennink

287

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

288

An integrated Ka/Ku-band payload for personal, mobile and private business communications  

NASA Astrophysics Data System (ADS)

The Canadian Department of Communications has been studying options for a government-sponsored demonstration payload to be launched before the end of the century. A summary of the proposed system concepts and network architectures for providing an advanced private business network service at Ku-band and personal and mobile communications at Ka-band is presented. The system aspects addressed include coverage patterns, traffic capacity, and grade of service, multiple access options as well as special problems, such as Doppler in mobile applications. Earth terminal types and the advanced payload concept proposed in a feasibility study for the demonstration mission are described. This concept is a combined Ka-band/Ku-band payload which incorporates a number of advanced satellite technologies including a group demodulator to convert single-channel-per-carrier frequency division multiple access uplink signals to a time division multiplex downlink, on-board signal regeneration, and baseband switching to support packet switched data operation. The on-board processing capability of the payload provides a hubless VSAT architecture which permits single-hop full mesh interconnectivity. The Ka-band and Ku-band portions of the payload are fully integrated through an on-board switch, thereby providing the capability for fully integrated services, such as using the Ku-band VSAT terminals as gateway stations for the Ka-band personal and mobile communications services.

Hayes, Edward J.; Keelty, J. Malcolm

1991-09-01

289

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

290

Method for Evaluation of Outage Probability on Random Access Channel in Mobile Communication Systems  

NASA Astrophysics Data System (ADS)

In order to access the cell in all mobile communication technologies a so called random-access procedure is used. For example in GSM this is represented by sending the CHANNEL REQUEST message from Mobile Station (MS) to Base Transceiver Station (BTS) which is consequently forwarded as an CHANNEL REQUIRED message to the Base Station Controller (BSC). If the BTS decodes some noise on the Random Access Channel (RACH) as random access by mistake (so- called ‘phantom RACH') then it is a question of pure coincidence which èstablishment cause’ the BTS thinks to have recognized. A typical invalid channel access request or phantom RACH is characterized by an IMMEDIATE ASSIGNMENT procedure (assignment of an SDCCH or TCH) which is not followed by sending an ESTABLISH INDICATION from MS to BTS. In this paper a mathematical model for evaluation of the Power RACH Busy Threshold (RACHBT) in order to guaranty in advance determined outage probability on RACH is described and discussed as well. It focuses on Global System for Mobile Communications (GSM) however the obtained results can be generalized on remaining mobile technologies (ie WCDMA and LTE).

Kollár, Martin

2012-05-01

291

Voice communication research and evaluation system  

NASA Astrophysics Data System (ADS)

The basic system is comprised of a multistation voice communication network consisting of the USAF standard aircraft intercommunication system, a standard A-19 diluter demand oxygen regulation system and an on line computer data collection and data analysis system that displays results in real time. The system is housed in a large reverberation chamber containing a programmable sound source capable of reproducing the spectrum and level of any AF operational noise environment. Standardized voice communication effectiveness test materials are used to assess the performance of any aspect of the total voice communication link, however, emphasis is usually placed upon the performance of the aircrew members. Examples of its application to voice communication problems are provided.

McKinley, R. L.

1981-06-01

292

Research Approaches to Mobile Use in the Developing World: A Review of the Literature  

Microsoft Academic Search

This paper reviews roughly 200 recent studies of mobile (cellular) phone use in the developing world, and identifies major concentrations of research. It categorizes studies along two dimensions. One dimension distinguishes studies of the determinants of mobile adoption from those that assess the impacts of mobile use, and from those focused on the interrelationships between mobile technologies and users. A

Jonathan Donner

2008-01-01

293

Analysis of network traffic in ad-hoc networks based on DSDV protocol with emphasis on mobility and communication patterns  

Microsoft Academic Search

An ad-hoc network is a collection of mobile nodes dynamically forming a temporary network without the use of any existing network infrastructure or centralized administration. Because of the limited communication range among mobile nodes in ad-hoc networks, several network hops may be needed to deliver a packet from one node to another one in the wireless network. In recent years,

V. Garousi

2005-01-01

294

PAULRAJ, GESBERT, PAPADIAS, ENCYCLOPEDIA FOR ELECTRICAL ENGINEERING, JOHN WILEY PUBLISHING CO., 2000 1 Smart Antennas for Mobile Communications  

E-print Network

., 2000 1 Smart Antennas for Mobile Communications A. J. Paulraj, D. Gesbert, C. Papadias Abstract--This paper presents a tutorial on emerging tech- nologies in the area of Smart Antennas for mobile wireless performance of the network. Smart antennas systems use modems which combine the signals of multi

Gesbert, David

295

Research on Tactual Communication of Speech: Ideas, Issues, and Findings.  

ERIC Educational Resources Information Center

This research review on tactual communication of speech discusses methods of communication intended for the tactual sense alone, issues related to tactual input as a supplement for speechreading, and issues related to developing new synthetic tactual aids and the roles such aids could play in treating people with profound hearing loss. (Author/JDD)

Reed, Charlotte M.; And Others

1989-01-01

296

IRD/M. Grouzis Research, applications, training and communication  

E-print Network

s s s > 6 7 © IRD/M. Grouzis #12;communication s RESEARCH AND TRAINING Preparing for the future - together 28 s INFORMATION AND COMMUNICATION Scientific information. The focus is on exploiting satellite sensor data coupled with ground data and setting up operational

297

Street Crossing: Observational Research and Developing Health Communication Strategies  

ERIC Educational Resources Information Center

Students in communication, and particularly in advertising, are encouraged to value creativity. However, even in programs that value creativity, it can be difficult to encourage creativity in the process of research that guides communication efforts. The project described in this paper--"Street Crossing"--is used in upper-division and…

Mackert, Michael; Lazard, Allison; Wyeth, Ben

2015-01-01

298

Management Qua Communication in Rocket Research and Development  

ERIC Educational Resources Information Center

Reviews a diagnostic study conducted by a communication consultant within the George C Marshall Space Flight Center during the research and development of the Saturn V or "Moon Rocket". Participant observation and in-depth interview methodology yields information on organizational communication and systematic problems within a complex network. (MH)

Tompkins, Phillip K.

1977-01-01

299

Women and Communicative Power: Theory, Research, and Practice.  

ERIC Educational Resources Information Center

A collection of essays that explores the links among women and communicative power from a variety of perspectives, this monograph focuses on issue analysis and suggestions for future research. The articles and their authors are as follows (1) "Women and Communicative Power: Introduction" (Carol Ann Valentine); (2) "Genderlect, Powerlect, and…

Valentine, Carol Ann; Hoar, Nancy, Ed.

300

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

Microsoft Academic Search

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

James Benet

1993-01-01

301

Using directionality in mobile routing  

Microsoft Academic Search

The increased usage of directional methods of communications has prompted research into leveraging directionality in every layer of the network stack. In this paper, we explore the use of directionality in layer 3 to facilitate routing in highly mobile environments. We introduce mobile orthogonal rendezvous routing protocol (MORRP), a lightweight, but scalable routing protocol utilizing directional communications (such as directional

Bow-Nan Cheng; Murat Yuksel; Shivkumar Kalyanaraman

2008-01-01

302

Autonomous Mobile Platform for Research in Cooperative Robotics  

NASA Technical Reports Server (NTRS)

This paper describes the design and development of a platform for research in cooperative mobile robotics. The structure and mechanics of the vehicles are based on R/C cars. The vehicle is rendered mobile by a DC motor and servo motor. The perception of the robot's environment is achieved using IR sensors and a central vision system. A laptop computer processes images from a CCD camera located above the testing area to determine the position of objects in sight. This information is sent to each robot via RF modem. Each robot is operated by a Motorola 68HC11E micro-controller, and all actions of the robots are realized through the connections of IR sensors, modem, and motors. The intelligent behavior of each robot is based on a hierarchical fuzzy-rule based approach.

Daemi, Ali; Pena, Edward; Ferguson, Paul

1998-01-01

303

OBCOM2006 INT'L CONFERENCE ON MOBILE, UBIQUITOUS & PERVASIVE COMPUTING Information and Communication Technologies (ICT) are critical to  

E-print Network

and Communication Technologies (ICT) are critical to India's future and underpin realization of the Vision 2020. It is essential that ICT sector meet the rise in demand for health and social care and to modernize services. In this context, use of mobile computing and communication is the key success factor for us in the global race

Melbourne, University of

304

Decision-Oriented Research in an Educational Communications Organization.  

ERIC Educational Resources Information Center

The Research and Planning Division at Ontario Educational Communications Authority undertakes formative, summative, background, and policy research to provide better educational services to audiences via electronic and associated media. Research activities are carried out by three groups. Planning and Development formulates long term plans,…

Miller, Lewis

305

Communicating about feminism and implementing feminist practices in research methodology  

E-print Network

COMMUNICATING ABOUT FEMINISM AND IMPLEMENTING FEMINIST PRACTICES IN RESEARCH METHODOLOGY A Thesis by MEGAN BARNARD Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degrcc... of MASTER OF ARTS Dcccmber 2001 Major Subject: English COMMUNICATING ABOUT FEMINISM AND IMPLEMENTING FEMINIST PRACTICES IN RESEARCH METHODOLOGY A Thesis by MEGAN BARNARD Submitted to Texas A&M University in partial fulfillment of the requirements...

Barnard, Megan

2012-06-07

306

Modifying Adoption Research for Mobile Internet Service Adoption: Cross-Disciplinary Interactions  

Microsoft Academic Search

One often meets the argument that the adoption of mobile Internet services is difficult to understand due to a lack of relevant research. However, much research has already been conducted on the adoption of basic mobile and traditional Internet services that are likely to converge into the services provided by the mobile Internet. In this article, we try to categorize

Per E. Pedersen; Rich Ling

2003-01-01

307

Research on phone contacts online status based on mobile cloud computing  

NASA Astrophysics Data System (ADS)

Because the limited ability of storage space, CPU processing on mobile phone, it is difficult to realize complex applications on mobile phones, but along with the development of cloud computing, we can place the computing and storage in the clouds, provide users with rich cloud services, helping users complete various function through the browser has become the trend for future mobile communication. This article is taking the mobile phone contacts online status as an example to analysis the development and application of mobile cloud computing.

Wang, Wen-jinga; Ge, Weib

2013-03-01

308

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.

309

How scientists use social media to communicate their research  

PubMed Central

Millions of people all over the world are constantly sharing an extremely wide range of fascinating, quirky, funny, irrelevant and important content all at once. Even scientists are no strangers to this trend. Social media has enabled them to communicate their research quickly and efficiently throughout each corner of the world. But which social media platforms are they using to communicate this research and how are they using them? One thing is clear: the range of social media platforms that scientists are using is relatively vast and dependent on discipline and sentiment. While the future of social media is unknown, a combination of educated speculation and persuasive fact points to the industry's continual growth and influence. Thus, is that not only are scientists utilizing social media to communicate their research, they must. The ability to communicate to the masses via social media is critical to the distribution of scientific information amongst professionals in the field and to the general population. PMID:22085450

2011-01-01

310

Interference Analysis Status and Plans for Aeronautical Mobile Airport Communications System (AeroMACS)  

NASA Technical Reports Server (NTRS)

Interference issues related to the operation of an aeronautical mobile airport communications system (AeroMACS) in the C-Band (specifically 5091-5150 MHz) is being investigated. The issue of primary interest is co-channel interference from AeroMACS into mobile-satellite system (MSS) feeder uplinks. The effort is focusing on establishing practical limits on AeroMACS transmissions from airports so that the threshold of interference into MSS is not exceeded. The analyses are being performed with the software package Visualyse Professional, developed by Transfinite Systems Limited. Results with omni-directional antennas and plans to extend the models to represent AeroMACS more accurately will be presented. These models should enable realistic analyses of emerging AeroMACS designs to be developed from NASA Test Bed, RTCA 223, and European results.

Kerczewski, Robert J.; Wilson, Jeffrey D.

2010-01-01

311

8 IAM Annual Report 13/14 3 Research Group on Communication  

E-print Network

and operate mobile communication software com- ponents to attain and fully benefit from cloud computing Systems" has been investigating how multimedia applications and cloud computing services with high demands the convergence between the mobile communication and cloud computing industry, enabled by the Internet

Sola, Rolf Haenni

312

Translating Health Communication Research Into Practice: The Importance of Implementing and Sustaining Evidence-Based Health Communication Interventions  

Microsoft Academic Search

This article examines the connections between health communication research and applications. It appears that many health care and health promotion practitioners have been slow to use research to help them accomplish their complex health communication goals. The result is that many complex health communication efforts that might benefit from research are guided more by good intentions, precedent, and expedience than

Gary L. Kreps

2012-01-01

313

Risk Communication Research at the University of Maryland TERROR PLOTS. SUPER FLU. CONTAMINATED FOOD.  

E-print Network

Risk Communication Research at the University of Maryland TERROR PLOTS. SUPER FLU. CONTAMINATED. Behind every headline are corporate leaders, government officials, and healthcare providers who need effective communication strategies for controlling and preventing public risk. Risk communication research

Hill, Wendell T.

314

Using a Communication Model to Collect Measurement Data through Mobile Devices  

PubMed Central

Wireless systems and services have undergone remarkable development since the first mobile phone system was introduced in the early 1980s. The use of sensors in an Ambient Intelligence approach is a great solution in a medical environment. We define a communication architecture to facilitate the information transfer between all connected devices. This model is based in layers to allow the collection of measurement data to be used in our framework monitoring architecture. An overlay-based solution is built between network elements in order to provide an efficient and highly functional communication platform that allows the connection of a wide variety of devices and technologies, and serves also to perform additional functions such as the possibility to perform some processing in the network that may help to improve overall performance. PMID:23012542

Bravo, José; Villarreal, Vladimir; Hervás, Ramón; Urzaiz, Gabriel

2012-01-01

315

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

316

Sex pheromone communication in the lepidoptera: New research progress  

Microsoft Academic Search

Summary Significant progress has been made recently in research on lepidopterous sex pheromones. Advances in understanding the biochemical, neurobiological, and behavioral events that results in both successful and unsuccessful pheromone communication have allowed researchers to gain new insights into the genetic control and evolution of phermone systems.

T. C. Baker

1989-01-01

317

A COMPUTERIZED BIBLIOGRAPHY OF MASS COMMUNICATION RESEARCH, 1944-1964.  

ERIC Educational Resources Information Center

THIS IS A KEY-WORD-IN-CONTEXT INDEX AND BIBLIOGRAPHY ON MASS COMMUNICATIONS RESEARCH AS REPORTED IN THE SOCIAL SCIENCE JOURNAL LITERATURE, PARTICULARLY, AS RELATED TO THE INTEREST OF MAGAZINE EXECUTIVES. TABLES IN THE INTRODUCTION SUMMARIZE COMPUTER FINDINGS ON THE LITERATURE ACCORDING TO RESEARCH METHOD USED IN THE STUDIES, THEIR RELEVANCE TO…

DANIELSON, WAYNE A.; WILHOIT, G.C., JR.

318

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

319

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

320

Scientific Mobility and International Research Networks: Trends and Policy Tools for Promoting Research Excellence and Capacity Building  

ERIC Educational Resources Information Center

One of the ways in which globalization is manifesting itself in higher education and research is through the increasing importance and emphasis on scientific mobility. This article seeks to provide an overview and analysis of current trends and policy tools for promoting mobility. The article argues that the mobility of scientific labour is an…

Jacob, Merle; Meek, V. Lynn

2013-01-01

321

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

322

A Method for Political Communication Research.  

ERIC Educational Resources Information Center

This paper suggests the applicability of metric multidimensional scaling for research within the political arena. Multidimensional scaling allows the researcher to simultaneously observe change and rates of change within the policy's attitudes toward the candidates and issues in election campaigns. Multidimensional scaling also reveals which…

Barnett, George A.; And Others

323

The ELLIPSO (tm) system: Elliptical low orbits for mobile communications and other optimum system elements  

NASA Technical Reports Server (NTRS)

On 5 Nov. 1990, Ellipsat filed with the FCC the first application to provide voice communication services via low earth orbiting (LEO) satellites. The proposed system, ELLIPSO, aims at achieving end-user costs comparable to those in the cellular industry. On 3 Jun. 1991 Ellipsat filed for the second complement of its system. Ellipsat was also the first company to propose combined position determination and mobile voice services via low-earth orbiting satellites. Ellipsat is still the only proponent of elliptical orbits for any commercial system in the United States. ELLIPSO uses a spectrum efficient combination of FDMA and CDMA techniques. Ellipsat's strategy is to tailor required capacity to user demand, reduce initial system costs and investment risks, and allow the provision of services at affordable end-user prices. ELLIPSO offers optimum features in all the components of its system, elliptical orbits, small satellites, integrated protocol and signalling system, integrated end-user electronics, novel marketing approach based on the cooperation with the tenets of mobile communications, end-user costs that are affordable, and a low risk approach as deployment is tailored to the growth of its customer base. The efficient design of the ELLIPSO constellation and system allows estimated end-user costs in the $.50 per minute range, five to six times less than any other system of comparable capability.

Castiel, David

1991-01-01

324

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

325

Mobile Databases: a Selection of Open Issues and Research Directions * Action members  

E-print Network

Mobile Databases: a Selection of Open Issues and Research Directions * Action members ** 1 EPFL, 2 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

Paris-Sud XI, Université de

326

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

327

MOBILE SENSING 1 MOBILE SENSING  

E-print Network

MOBILE SENSING 1 MOBILE SENSING ! ! Parham Aarabi #12;MOBILE SENSING 2 20 years of sensing research #12;MOBILE SENSING 3 Low Likelihood High Likelihood #12;MOBILE SENSING 4 Image Courtesy of Apple Inc. #12;MOBILE SENSING 5 What can we do with all the sensors on our mobile devices? #12;MOBILE SENSING 6

Prodiæ, Aleksandar

328

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

329

Channel aware HARQ scheme based on LDPC codes for land mobile satellite communication system  

NASA Astrophysics Data System (ADS)

In this paper, a channel aware HARQ (CA-HARQ) scheme based on data punctured rate compatible LDPC (DP-LDPC) codes, which might satisfy the demand for bandwidth and rate in land mobile communication system, is proposed. The scheme is based on type II HARQ technique cooperated with a DP- LDPC code. In the proposed scheme, the effective rate of the LDPC code is adapted according to the channel quality information (CQI) estimated at the receiver, so as to decrease the redundancy when the channel is good and vice versa, the retransmitted blocks are combined with the previous information transmitted to achieve high probability of successful decoding. In this paper, we use a 2-bit CQI feedback scheme. Simulation results, which based on a land mobile satellite channel, show that the proposed channel aware H-ARQ scheme based on DP-LDPC codes improved the throughput by 0.4dB at low SNR compared to a pure DP-LDPC type II HARQ, and it can also be an effective solution to compensate rain attenuation and multipath fading in land mobile satellite systems.

Yang, Yongli; Zhu, Guangxi; Wang, Desheng; Wu, Lifen

2007-11-01

330

Small-Scale Design Experiments as Working Space for Larger Mobile Communication Challenges  

ERIC Educational Resources Information Center

In this paper, a design experiment using Instagram as a cultural probe is submitted as a method for analyzing the challenges that arise when considering the implementation of social media within a distributed communication space. It outlines how small, iterative investigations can reveal deeper research questions relevant to the education of…

Lowe, Sarah; Stuedahl, Dagny

2014-01-01

331

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

332

Content Analysis as a Foundation for Programmatic Research in Communication  

PubMed Central

Previous arguments that content analyses provide the descriptive foundation for media effects research (McLeod & Reeves, 1980) are extended to include that content analyses can provide a sound and useful foundation for programmatic research by individual communication scientists. I discuss examples from my own work and from that of colleagues in communication and related disciplines. Use of messages sampled and coded in a content analysis in combination with survey data sets or as stimuli in experiments are highlighted. The particular potential for employing larger numbers of randomly sampled messages in experimental designs, and, with use of appropriate statistical methods, being able to generalize to populations of messages, is described. PMID:23914276

Slater, Michael D.

2013-01-01

333

Mobile Applications for Participation at the Shopping Mall: Content Analysis and Usability for Persons with Physical Disabilities and Communication or Cognitive Limitations  

PubMed Central

The aim of this exploratory study was to determine the important features in content and usability of existing mobile applications evaluating environmental barriers and facilitators (EBF) to participation for persons with physical disabilities presenting mild communication or cognitive limitations. A rigorous process based on a user-centered design approach led to the identification of two relevant mobile applications to evaluate the EBF. An accessibility expert, the research team as well as five users then tested the mobile applications in a shopping mall. A thematic content analysis of the research team’s and users’ comments established 10 categories of key features that adequately respond to the needs of the clientele targeted in this study. In terms of content, granularity and contextualization of the information provided were considered important. With respect to usability, relevant features were place finding, rating system, presentation of results, compatibility, user-friendliness, aesthetics, credibility of the information as well as connectivity/interactiveness. The research team and the users agreed on some aspects such as aesthetics, but had different perspectives on features such as the rating system or the connectivity/interactiveness of the application. The users proposed new features suggesting that the existing mobile applications did not correspond to all their needs. PMID:25513999

Auger, Claudine; Leduc, Emilie; Labbé, Delphine; Guay, Cassioppée; Fillion, Brigitte; Bottari, Carolina; Swaine, Bonnie

2014-01-01

334

Mobile applications for participation at the shopping mall: content analysis and usability for persons with physical disabilities and communication or cognitive limitations.  

PubMed

The aim of this exploratory study was to determine the important features in content and usability of existing mobile applications evaluating environmental barriers and facilitators (EBF) to participation for persons with physical disabilities presenting mild communication or cognitive limitations. A rigorous process based on a user-centered design approach led to the identification of two relevant mobile applications to evaluate the EBF. An accessibility expert, the research team as well as five users then tested the mobile applications in a shopping mall. A thematic content analysis of the research team's and users' comments established 10 categories of key features that adequately respond to the needs of the clientele targeted in this study. In terms of content, granularity and contextualization of the information provided were considered important. With respect to usability, relevant features were place finding, rating system, presentation of results, compatibility, user-friendliness, aesthetics, credibility of the information as well as connectivity/interactiveness. The research team and the users agreed on some aspects such as aesthetics, but had different perspectives on features such as the rating system or the connectivity/interactiveness of the application. The users proposed new features suggesting that the existing mobile applications did not correspond to all their needs. PMID:25513999

Auger, Claudine; Leduc, Emilie; Labbé, Delphine; Guay, Cassioppée; Fillion, Brigitte; Bottari, Carolina; Swaine, Bonnie

2014-01-01

335

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

336

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

337

Z .Developmental Brain Research 111 1998 143146 Short communication  

E-print Network

Z .Developmental Brain Research 111 1998 143­146 Short communication Cell death precedes rod Abstract We measured cell death in the retinas of embryonic and adult teleost fish using TUNEL staining death occurs in all three nuclear layers. The lack of a corresponding pattern of cell death

Fernald, Russell

338

Making Numbers Matter: Present and Future Research in Risk Communication  

ERIC Educational Resources Information Center

Objective: To summarize existing research on individual numeracy and methods for presenting risk information to patients. Methods: We selectively retrieved articles from MEDLINE and the "Social Sciences Citation Index". Results: Many Americans have low numeracy skills, a deficit that impedes effective health care. Approaches to risk communication

Fagerlin, Angela; Ubel, Peter A.; Smith, Dylan M.; Zikmund-Fisher, Brian J.

2007-01-01

339

International News Communication Research: A Meta-Analytic Assessment.  

ERIC Educational Resources Information Center

A survey of "Journalism Quarterly,""Gazette,""Public Opinion Quarterly,""Journal of Broadcasting," and "Journal of Communication" reveals that the early research on international news flow or coverage emphasized two aspects of news: (1) how the United States was portrayed in the media of other nations, and (2) what the effect of American society…

Tsang, Kuo-jen

340

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

341

Associate Dean of Libraries for Research and Scholarly Communication  

E-print Network

Associate Dean of Libraries for Research and Scholarly Communication Management Services Earnstein Dukes Serials Maintenance Library Associate Christina Thomas Specialist IV Rebecca Hatchett Bruce Tharp Specialist IV Esther DeLeon Janie Boyd Copy Cataloging Library Associate Joseph Yeager Specialist IV Susan Mc

Rock, Chris

342

Associate Dean of Libraries for Research and Scholarly Communication  

E-print Network

Associate Dean of Libraries for Research and Scholarly Communication Management Services Earnstein Dukes Serials Maintenance Library Associate Christina Thomas Specialist IV Rebecca Hatchett Bruce Tharp Esther DeLeon Janie Boyd Copy Cataloging Library Associate Joseph Yeager Specialist IV Susan McHam David

Rock, Chris

343

Associate Dean of Libraries for Research and Scholarly Communication  

E-print Network

Associate Dean of Libraries for Research and Scholarly Communication Management Services Earnstein Dukes Serials Maintenance Library Associate Christina Thomas Specialist IV Bruce Tharp Nathan Menendez IV Esther DeLeon Janie Boyd Copy Cataloging Library Associate Joseph Yeager Specialist IV Susan Mc

Rock, Chris

344

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

345

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

346

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

347

Communicating in context: a priority for gene therapy researchers.  

PubMed

History shows that public opinion of emerging biotechnologies has the potential to impact the research process through mechanisms such as funding and advocacy. It is critical, therefore, to consider public attitudes towards modern biotechnology such as gene therapy and more specifically towards the ethics of gene therapy, alongside advances in basic and clinical research. Research conducted through social media recently assessed how online users view the ethics of gene therapy and showed that while acceptability is high, significant ethical concerns remain. To address these concerns, the development of effective and evidence-based communication strategies that engage a wide range of stakeholders should be a priority for researchers. PMID:25556839

Robillard, Julie M

2015-03-01

348

Research of STBC in free space optical communications system  

NASA Astrophysics Data System (ADS)

Free Space Optical (FSO) communication is a communication pattern in which laser is used as the information carrier in atmosphere environment. FSO system has been widely applied in the fields of satellite communication and ground sight distance communication, with a promising application prospect and tremendous market potential. And space-time processing (using multiple antennas) is now recognized as a key to achieving reliable high data rate wireless communications and is being incorporated into the physical layer of many wireless standards. In this letter, error rate performance for space-time block coding (STBC) in FSO communication systems with direct detection operating over strong atmospheric turbulence channels is analyzed. The purpose of the paper is: (i) to determine the channel capacity of FSO system in the presence of atmospheric turbulence, (ii) to see how much this limit can be approached using the best known STBC techniques. In this paper, we use mathematics tool to establish the channel model of FSO system, and then apply the STBC to the FSO system, research the decoding method and simulate the performance using MATLAB tools. The mathematics analysis and simulation results show the great application expectation of STBC in the OOK channel of the FSO system.

Deng, Tianping; Peng, Kai; Lu, Yimin

2009-12-01

349

The design and networking of dynamic satellite constellations for global mobile communication systems  

NASA Technical Reports Server (NTRS)

Various design factors for mobile satellite systems, whose aim is to provide worldwide voice and data communications to users with hand-held terminals, are examined. Two network segments are identified - the ground segment (GS) and the space segment (SS) - and are seen to be highly dependent on each other. The overall architecture must therefore be adapted to both of these segments, rather than each being optimized according to its own criteria. Terrestrial networks are grouped and called the terrestrial segment (TS). In the SS, of fundamental importance is the constellation altitude. The effect of the altitude on decisions such as constellation design choice and on network aspects like call handover statistics are fundamental. Orbit resonance is introduced and referred to throughout. It is specifically examined for its useful properties relating to GS/SS connectivities.

Cullen, Cionaith J.; Benedicto, Xavier; Tafazolli, Rahim; Evans, Barry

1993-01-01

350

Enhanced spectral efficiency using bandwidth switchable SAW filtering for mobile satellite communications systems  

NASA Technical Reports Server (NTRS)

Currently proposed mobile satellite communications systems require a high degree of flexibility in assignment of spectral capacity to different geographic locations. Conventionally this results in poor spectral efficiency which may be overcome by the use of bandwidth switchable filtering. Surface acoustic wave (SAW) technology makes it possible to provide banks of filters whose responses may be contiguously combined to form variable bandwidth filters with constant amplitude and phase responses across the entire band. The high selectivity possible with SAW filters, combined with the variable bandwidth capability, makes it possible to achieve spectral efficiencies over the allocated bandwidths of greater than 90 percent, while retaining full system flexibility. Bandwidth switchable SAW filtering (BSSF) achieves these gains with a negligible increase in hardware complexity.

Peach, Robert; Malarky, Alastair

1990-01-01

351

Concepts and cost trade-offs for land vehicle antennas in satellite mobile communications  

NASA Technical Reports Server (NTRS)

Several antenna design concepts, operating at UHF (821 to 825 MHz transmit and 866 to 870 MHz receive bands), with gain ranging between 6 and 12 dBic, that are suitable for land mobile vehicles are presented. The antennas may be used within CONUS and ALASKA to communicate to and from a geosynchronous satellite. Depending on the type of steering mechanism, the antennas are broken down into three categories; (1) electronically scanned arrays with phase shifters, (2) electronically switched arrays with switchable power dividers/combiners, and (3) mechanically steered arrays. The operating characteristics of two of these design concepts, one a conformal antenna with electronic beam steering and the other a nonconformal design with mechanical steering, were evaluated with regard to two and three satellite system. Cost estimates of various antenna concepts were made and plotted against their overall gain performance.

Haddad, H. A.

1948-01-01

352

Edgar Nett Mobile Computer Communication SS'14 22 Using Spreading for all signals of a frequency band  

E-print Network

band frequency channel quality 1 2 3 4 5 6 narrow band signal guard space narrowband channels due;Edgar Nett Mobile Computer Communication SS'14 25 FHSS (Frequency Hopping Spread Spectrum) I Discrete changes of carrier frequency (hopping) q Hopping sequence determined via pseudo random number sequence Two

353

Feasibility and usability of a home monitoring concept based on mobile phones and near field communication (NFC) technology.  

PubMed

Utilization of mobile information and communication technologies in home monitoring applications is becoming more and more common. The mobile phone, acting as a patient terminal for patients suffering from chronic diseases, provides an active link to the caregiver to transmit health status information and receive feedback. In such a concept the usability is still limited by the necessity of entering the values via the mobile phone's small keypad. The near field communication technology (NFC), a touch-based wireless interface that became available recently, may improve the usability level of such applications significantly. The focus of this paper is to describe the development of a prototype application based on this technology embedded in a home monitoring system. The feasibility and usability of this approach are evaluated and compared with concepts used in previous approaches. The high quantifier with respect to overall usability indicates that NFC may be the technology of choice for some tasks in home monitoring applications. PMID:17911689

Morak, Jürgen; Kollmann, Alexander; Schreier, Günter

2007-01-01

354

Climate science communication from researchers to diverse audiences  

NASA Astrophysics Data System (ADS)

Climate science is a topic that engenders a public response that is very different than the response to many other scientific fields. Communicating climate research results, therefore, presents a unique challenge to the researcher who wishes to put their results on a broader stage. Techniques of communicating climate science in a meaningful manner include understanding the audience in question, and presenting the scientific results in a way that engages the target audience in a manner that precludes cultural and political bias, both on the part of the presenter and in the elicited response from the audience. We hope to present experiences and lessons learned from presenting satellite-based climate research on behalf of NASA and NOAA projects, with respect to target audiences including K-12, higher education, citizen scientists, and the general public.

Rogers, M. A.

2011-12-01

355

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

356

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

357

Adaptive data rate SSMA system for personal and mobile satellite communications  

NASA Technical Reports Server (NTRS)

An adaptive data rate SSMA (spread spectrum multiple access) system is proposed for mobile and personal multimedia satellite communications without the aid of system control earth stations. This system has a constant occupied bandwidth and has variable data rates and processing gains to mitigate communication link impairments such as fading, rain attenuation and interference as well as to handle variable data rate on demand. Proof of concept hardware for 6MHz bandwidth transponder is developed, that uses offset-QPSK (quadrature phase shift keying) and MSK (minimum shift keying) for direct sequence spread spectrum modulation and handle data rates of 4k to 64kbps. The RS422 data interface, low rate voice and H.261 video codecs are installed. The receiver is designed with coherent matched filter technique to achieve fast code acquisition, AFC (automatic frequency control) and coherent detection with minimum hardware losses in a single matched filter circuit. This receiver structure facilitates variable data rate on demand during a call. This paper shows the outline of the proposed system and the performance of the prototype equipment.

Ikegami, Tetsushi; Takahashi, Takashi; Arakaki, Yoshiya; Wakana, Hiromitsu

1995-01-01

358

Research in space commercialization, technology transfer, and communications  

NASA Technical Reports Server (NTRS)

Research and internship programs in technology transfer, space commercialization, and information and communications policy are described. The intern's activities are reviewed. On-campus research involved work on the costs of conventional telephone technology in rural areas, an investigation of the lag between the start of a research and development project and the development of new technology, using NASA patent and patent waiver data, studies of the financial impact and economic prospects of a space operation center, a study of the accuracy of expert forecasts of uncertain quantities and a report on frequency coordination in the fixed and fixed satellite services at 4 and 6 GHz.

1982-01-01

359

An Infrared Network for Mobile Computers  

Microsoft Academic Search

The PARCTAB infrared network provides a flexible infrastructure for research into wireless mobile computing. The network consists of a collection of room-sized cells each wired with a base station transceiver. Mobile computers communicate with transceivers through a carrier sense multiple access (CSMA) protocol and act as terminals for applications executing on remote hosts. Each mobile computer is represented by a

Norman Adams; Bill N. Schilit; Michael M. Tso; Roy Want

1993-01-01

360

Research on optic antenna of space laser communication networking  

NASA Astrophysics Data System (ADS)

With the highlights of the high transmission rate, large capacity, strong anti-interference and anti-capture ability, good security and small light, space laser communication becomes an important hotspot. At present, the focus of research of the laser communication system is point to point communication structure. However, from the application point of view, both the realization of space laser communication among multiple points and the establishment of the information transmission network can really have the practical value. Aiming at the problem of space laser communication network, this article puts forward the general idea about optical antenna to achieve multiple tracking goals at the same time. Through the analysis of the optical antenna, and the comparing of the current commonly used mirror driving mechanism, a new mirror driving mechanism is designed. The azimuth motion, containing circular grating feedback, is driven by torque motor?voice coil motor of fan produces pitch motion that has fan-shaped grating feedback, so that compression of the structure size to improve the efficiency of the reflector assembly. Through the establishment of the driving mechanism and the kinematic model of 3D entity, the relationship between the single drive azimuth and pitch angle following the angle of incident light is explained. The biggest ideal view area affecting the optical antenna is obtained by the simulation analysis of the kinematics model using MATLAB. The several factors of field overlap area and blind area offers a theoretical basis for structure optimization and control system for the subsequent optical antenna design.

Meng, Li-Xin; Li, Long; Zhang, Li-zhong; Zhao, Shan-shan; Jiang, Hui-lin

2013-08-01

361

Mobility Management Research of Internet Based on the Splitting Mechanism  

Microsoft Academic Search

This paper proposes a new Internet architecture based on splitting Mechanism. It separates the Internet access networks from the core network, and makes the IPv6 routing both in access networks and the core network more scalable. Furthermore, this paper gives the mobility management protocol of the proposed Internet architecture which supports the host based and the network based mobility management

Huachun Zhou; Fei Song; Hongke Zhang

2011-01-01

362

The 18th Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC'07) 1-4244-1144-0/07/$25.00 2007 IEEE.  

E-print Network

or simply SITs. The DVB-RCS Hub is vital for the operation of the DVB-RCS satellite communications network the new developments in satellite networks such as DVB-RCS. In fact, satellite communication systemsThe 18th Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications

Vouyioukas, Demosthenes

363

DCCPS: HCIRB: CECCR: Penn’s Center of Excellence in Cancer Communication Research, University of Pennsylvania  

Cancer.gov

Skip Navigation Twitter Multimedia Home About Key Initiatives Funding Resources Tools Cancer Control & Population Sciences Home Behavioral Research Program Home Health Communication and Informatics Research Home Center of Excellence in Cancer Communication

364

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

365

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

366

Research and Development on the Broadband Communication System for Airplane using Millimeter-Wavelength Band  

Microsoft Academic Search

Various broadband communication systems for airplane are under development in Japan. One is for rescue and support on disaster such as earthquakes, floods and also for ground surveillance, land measurement and so on. Another is for in-cabin ubiquitous wireless environment such as mobile phone, wireless LAN for passenger airplane. We have developed on-board equipment on broadband communication system in Ka

Mikio Suzuki; Hiroyuki Tsuji; Derek Gray; Takayuki Morisaki

2008-01-01

367

EmotionSense: a mobile phones based adaptive platform for experimental social psychology research  

Microsoft Academic Search

Today's mobile phones represent a rich and powerful computing platform, given their sensing, processing and communication capabilities. Phones are also part of the everyday life of billions of people, and therefore represent an exceptionally suitable tool for conducting social and psychological experiments in an unobtrusive way. de the ability of sensing individual emotions as well as activities, verbal and proximity

Kiran K. Rachuri; Mirco Musolesi; Cecilia Mascolo; Peter J. Rentfrow; Chris Longworth; Andrius Aucinas

2010-01-01

368

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

Microsoft Academic Search

A new Cloud Mobile Gaming (CMG) approach, where the responsibility of executing the gaming engines, including the most compute intensive tasks of graphic rendering, is put on cloud servers instead of the mobile devices, has the potential for enabling mobile users to play the same rich Internet games available to PC users. However, the mobile gaming user experience may be

Shaoxuan Wang; Sujit Dey

2010-01-01

369

Handbook of Research for Educational Communications and Technology. A Project of the Association for Educational Communications and Technology (AECT).  

ERIC Educational Resources Information Center

This handbook provides an overview of research in the field of educational communications and technology. The handbook may be used to familiarize students and researchers with a domain of research in this field prior to their own research, or may be used as a guide for selecting research topics or methodologies. The book consists of 42 papers by…

Jonassen, David H., Ed.

370

Differential signaling spread-spectrum modulation of the LED visible light wireless communications using a mobile-phone camera  

NASA Astrophysics Data System (ADS)

Visible light communication (VLC) using spread spectrum modulation (SSM) and differential signaling (DS), detected by a mobile-phone camera is proposed and demonstrated for the first time to provide high immunity to background ambient light interference. The SSM signal provides the coding gain while the DS scheme enhances the clock recovery particular under high background ambient light. Experiment results confirm the feasibility of the proposed scheme, showing that the proposed system has 6-dB gain comparing with the traditional on-off keying (OOK) modulation under background ambient light of 3000 lux. The direct incident ambient light to the mobile-phone camera is 520 lux.

Chen, Shih-Hao; Chow, Chi-Wai

2015-02-01

371

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

PubMed

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

372

A Metasynthesis of Patient-Provider Communication in Hospital for Patients with Severe Communication Disabilities: Informing New Translational Research  

PubMed Central

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

Balandin, Susan

2014-01-01

373

Fabric antennas for mobile telephony integrated within clothing Philips Research Laboratories, Redhill, UK  

E-print Network

Fabric antennas for mobile telephony integrated within clothing P.J.Massey Philips Research. This paper describes work integrating mobile phone antennas. Conducting fabrics offer antenna performance that is at least as good as conventional antennas, while being inconspicuous and comfortable to wear. 1

Haddadi, Hamed

374

Research on mobile electronic commerce security technology based on WPKI  

NASA Astrophysics Data System (ADS)

Through the in-depth study on the existing mobile e-commerce and WAP protocols, this paper presents a security solution of e-commerce system based on WPKI, and describes its implementation process and specific implementation details. This solution uniformly distributes the key used by the various participating entities , to fully ensure the confidentiality, authentication, fairness and integrity of mobile e-commerce payments, therefore has some pract ical value for improving the security of e-commerce system.

Zhang, Bo

2013-07-01

375

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

376

Mobility-Based Mobile Relay Selection in MANETs  

NASA Astrophysics Data System (ADS)

The future wireless mobile communication networks are expected to provide seamless wireless access and data exchange to mobile users. In particular, it is expected that the demand for ubiquitous data exchange between mobile users will increase with the widespread use of various wireless applications of the intelligent transportation system (ITS) and intelligent vehicles. Mobile ad hoc networks (MANETs) are one of the representative research areas pursuing the technology needed to satisfy the increasing mobile communication requirements. However, most of the works on MANET systems do not take into account the continuous and dynamic changes of nodal mobility to accommodate system design and performance evaluation. The mobility of nodes limits the reliability of communication between the source and the destination node since a link between two continuously moving nodes is established only when one node enters the transmission range of the other. To alleviate this problem, mobile relay has been studied. In particular, it is shown that relay selection is an efficient way to support nodal mobility in MANET systems. In this paper, we propose a mobility-based relay selection algorithm for the MANET environment. Firstly, we define the lifetime as the maximum link duration for which the link between two nodes remains active. Therefore, the lifetime indicates the reliability of the relay link which measures its capability to successfully support relayed communication when requested by the source node. Furthermore, we consider a series of realistic scenarios according to the randomness of nodal mobility. Thus, the proposed algorithm can be easily applied in practical MANET systems by choosing the appropriate node mobility behavior. The numerical results show that the improved reliability of the proposed algorithm's relayed communication is achieved with a proper number of mobile relay nodes rather than with the conventional selection algorithm. Lastly, we show that random mobility of the individual nodes enhances reliability of the network in a sparse network environment.

Kim, Gilnam; Lee, Hyoungjoo; Lee, Kwang Bok

377

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

378

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

379

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

NASA Technical Reports Server (NTRS)

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 bit energy-to-noise power density ratio (E(sub b)/N(sub 0)) 2.5 dB to yield 10(exp -3) average bit error rate (BER) when carrier power-to-multipath power ratio (CMR) is 15 dB. The pre-detection UW detector improves UW detection probability when the frequency offset is large. The UW-reverse-modulation type demodulator realizes a maximum pull-in frequency of 3.9 kHz, the pull-in time is 2.4 seconds and frequency error is less than 20 Hz. The performances of this demodulator are confirmed through computer simulations and its effect is clarified in real-time experiments at a bit rate of 16.8 kbps using a digital signal processor (DSP).

Dohi, Tomohiro; Nitta, Kazumasa; Ueda, Takashi

1993-01-01

380

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

381

An implanted spherical head model exposed to electromagnetic fields at a mobile communication frequency.  

PubMed

Can cellular phones and personal communication systems base station antennas affect the active or passive implantable medical devices adversely? Concerns over the possible harmful effects of nonionizing irradiaton upon implanted medical devices have been present for many years. Key issues to address are the questions of whether mobile phones have a detrimental effect on implants, and how the interaction of the handset with the body can be minimized in order to both alleviate public fears and improve handset antenna performance and new implant designs. This paper presents a thorough investigation of the scattering of an electromagnetic (EM) wave from a perfectly conducting implant (a cylindrical wire and a very thin cylindrical disk) of electrically small radius (of resonant length), embedded eccentrically into a dielectric spherical head model by a dipole antenna (0.4 wavelength) at 900 MHz. The dyadic Green's function (DGF) for spherical vector wave functions is employed. Analytical expressions for the scattered fields of an implant embedded head model is obtained. Numerical results from analytical expressions are computed for this problem and then compared with the results from the same model using the finite-difference time-domain, EMU-FDTD electromagnetic simulator. Good agreement is observed between the analytical results on the proposed method in comparison with the FDTD method. PMID:17019874

Reyhani, S M S; Ludwig, Simone A

2006-10-01

382

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

383

75 FR 8112 - In the Matter of Certain Mobile Telephones and Wireless Communication Devices Featuring Digital...  

Federal Register 2010, 2011, 2012, 2013, 2014

...Communication Devices Featuring Digital Cameras, and Components Thereof; Notice of Investigation...communication devices featuring digital cameras, and components thereof by reason of...communication devices featuring digital cameras, or [[Page 8113

2010-02-23

384

Effect of global system for mobile communication (GSM) microwave exposure on blood-brain barrier permeability in rat  

Microsoft Academic Search

We investigated the effects of global system for mobile communication (GSM) microwave exposure on the permeability of the\\u000a blood-brain barrier using a calibrated microwave exposure system in the 900 MHz band. Rats were restrained in a carousel of\\u000a circularly arranged plastic tubes and sham-exposed or microwave irradiated for a duration of 4 h at specific brain absorption\\u000a rates (SAR) ranging

K. Fritze; C. Sommer; B. Schmitz; G. Mies; K.-A. Hossmann; M. Kiessling; C. Wiessner

1997-01-01

385

The application of a novel two-way mobile satellite communications and vehicle tracking system to the transportation industry  

Microsoft Academic Search

A two-way mobile satellite communications and vehicle position reporting system currently operational in the US and Europe is described. The system characteristics and service operations are described in detail, and technical descriptions of the equipment and signal processing techniques are provided. The application of this technology to the land transportation industry, specifically the over-the-road truckload motor carrier segment, and the

I. M. Jacobs; A. Salmasi; T. J. Bernard

1991-01-01

386

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

387

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

Code of Federal Regulations, 2011 CFR

...2011-01-01 false Communication of research misconduct policies and procedures...FINANCIAL OFFICER, DEPARTMENT OF AGRICULTURE RESEARCH INSTITUTIONS CONDUCTING USDA-FUNDED EXTRAMURAL RESEARCH; RESEARCH MISCONDUCT § 3022.8...

2011-01-01

388

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

389

National Cancer Institute Funds Four Centers of Excellence in Cancer Communications Research  

Cancer.gov

The National Cancer Institute (NCI) today announced plans to fund four Centers of Excellence in Cancer Communications Research (CECCR). The CECCR initiative is the centerpiece of NCI's Extraordinary Opportunity in Cancer Communications (EOCC), a broad initiative that supports research and outreach aimed at increasing the knowledge about, tools for, access to, and use of cancer communications by the public, patients, survivors, and health professionals.

390

Call-based Fraud Detection in Mobile Communication Networks using a Hierarchical  

E-print Network

by a mobile phone theft, by cloning the mobile phone card or by acquiring a subscription with false calls originating from one subscription, evidencing card cloning. While this procedure efficiently which detects card cloning by using an upper speed limit at which a mobile phone user can travel

Tresp, Volker

391

RESEARCH Open Access Mobile multimedia sensor networks: architecture  

E-print Network

-Feng Lai2* and Honggang Wang3 Abstract Recent advances in the fields of wireless technology and multimedia various technologies, such as wireless sensor networks, embedded multimedia system and node mobility tradeoff, energy efficiency 1 Introduction Recent advances in the fields of wireless technology, multimedia

Chen, Min

392

A High Speed, Long-Range Mobile Communications Link for use in Polar Regions  

NASA Astrophysics Data System (ADS)

The Polar Radar for Ice Sheet Measurements (PRISM) project has developed a high bandwidth, wireless communications link between an autonomous rover and a manned vehicle deployed on a polar ice sheet to exchange real-time video, timing signals for a bistatic radar, and rover sensory data. The PRISM project is developing advanced intelligent remote sensing technology that involves radar systems, an autonomous rover, and communications systems to measure detailed ice sheet characteristics, and to determine bed conditions (frozen or wet) below active ice sheets in both Greenland and Antarctica. While this wireless communications link is being developed to fill a need within the PRISM Project, the same technology will allow polar researchers separated by moderate distances ( ˜10 km) to exchange data. The communications link is based on a high data rate 802.11b wireless technology, and a prototype system has been tested and evaluated during field experiments conducted at the NorthGRIP ice core drilling camp in Greenland (75° 06\\'\\ N, 42° 20\\'\\ W) from June 23-July 17, 2003. The IEEE 802.11b standard works in the 2.4-2.483 GHz band and has been widely used for high-speed data transfer in a WLAN (Wireless Local Area Network). It typically has a range of a few hundred meters and theoretical data rates on the order of 11 Mbps. It has been used for a number of applications in home and office environments. We modified a 802.11b system to operate up to a maximum distance of about 8 km and investigated the radio propagation environment over the flat terrain of the Greenland ice sheet. We evaluated its performance along three different tracks of 8 km in length, and made throughput measurements at intervals of 0.5 km. We measured the received signal strength and noise level in 2-s intervals along these 8 km tracks. Also we conducted experiments for four different antenna heights (1, 2, 3 and 5 m) for developing a radio propagation model for WLAN communication over the ice sheet. We found that peer-to-peer communication between nodes on the ice had data rates varying from 4.5 Mbps at close range to 2.5 Mbps at a distance of 8 km from the base station. The design, propagation model, throughput and coverage of this peer-to-peer communications system in Greenland are presented in this paper. This WLAN system has numerous applications in polar field camps. We tested the transfer of real-time video segments across this link for our educational outreach efforts in the field. These video segments were subsequently uploaded using an Iridium-based Internet link, and sent back to the University of Kansas. The wireless Internet connectivity was also made available to members of the North Grip camp, who were able to access e-mail and the Internet from their tents and common areas. However, throughput for wireless access to the Internet was limited by the Iridium-based Internet connection that had a maximum bandwidth of 9.6 Kbps.

Chalishazar, N.; Prescott, G.; Braaten, D.

2003-12-01

393

NASA satellite communications application research, phase 2 addendum. Efficient high power, solid state amplifier for EHF communications  

Microsoft Academic Search

This document is an addendum to the NASA Satellite Communications Application Research (SCAR) Phase 2 Final Report, 'Efficient High Power, Solid State Amplifier for EHF Communications.' This report describes the work performed from 1 August 1993 to 11 March 1994, under contract number NASW-4513. During this reporting period an array of transistor amplifiers was repaired by replacing all MMIC amplifier

James Benet

1994-01-01

394

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

395

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

396

Power and spectrally efficient M-ARY QAM schemes for future mobile satellite communications  

NASA Technical Reports Server (NTRS)

An effective method to compensate nonlinear phase distortion caused by the mobile amplifier is proposed. As a first step towards the future use of spectrally efficient modulation schemes for mobile satellite applications, we have investigated effects of nonlinearities and the phase compensation method on 16-QAM. The new method provides about 2 dB savings in power for 16-QAM operation with cost effective amplifiers near saturation and thereby promising use of spectrally efficient linear modulation schemes for future mobile satellite applications.

Sreenath, K.; Feher, K.

1990-01-01

397

75 FR 44282 - In the Matter of Certain Mobile Telephones and Wireless Communication Devices Featuring Digital...  

Federal Register 2010, 2011, 2012, 2013, 2014

...Telephones and Wireless Communication Devices Featuring Digital Cameras, and Components Thereof; Notice of Commission Determination...telephones and wireless communication devices featuring digital cameras, and components thereof, that infringe certain claims...

2010-07-28

398

IEEE Wireless Communications February 2014 331536-1284/14/$25.00 2014 IEEE MOBILE SOCIAL NETWORKS  

E-print Network

remain between smartphone users (SUs) and Internet service providers (ISPs). Web-based/ password-range wireless communications such as near field communication (NFC), Bluetooth, and WiFi Direct. For example

Shen, Xuemin "Sherman"

399

Research on communication between computer and PLC based on VB  

Microsoft Academic Search

This paper mainly introduces the communication between computer and S7–200PLC of Siemens, in which host computer (PC) adopts MSComm control in VB6.0, a visual programming language, to implement the data communication between console computer (S7–200 PLC) and computer, based on free port communication protocol. Communication protocol format is user-defined in this paper, so huge data communication in real time can

Hui Fang; Wei Tang

2012-01-01

400

Int. J Mobile Communications, Vol. 3, No. 3, 2005 303 Key issues for the design and development of mobile  

E-print Network

in several research programmes, including IST-funded FP5 e-MINDER and SEACORN projects, and FP6 B, and IT Consultant in Banking Systems. Since 1999, he is a Research Associate of the Cyprus Institute of Neurology and Genetics. His research interests include software engineering, web engineering, and computational

Pitsillides, Andreas

401

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

402

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

403

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

404

Research Results: Mobility of BC Transfer Students. Fall 2007 to Calendar Year 2008  

ERIC Educational Resources Information Center

This newsletter highlights research results on the Mobility of Transfer Students (MTS), a branch of research conducted under the auspices of the Student Transitions Project (STP). In this annual study, students enrolled in the Fall of 2007 in BC colleges, university colleges, and institutes were followed into calendar year 2008 to identify those…

Heslop, Joanne

2009-01-01

405

Text Entry for Mobile Computing: Models and Methods, Theory and Practice  

Microsoft Academic Search

Text input for mobile or handheld devices is a flourishing research area. This article begins with a brief history of the emergence and impact of mobile com- puters and mobile communications devices. Key factors in conducting sound evaluations of new technologies for mobile text entry are presented, including methodology and experiment design. Important factors to consider are identi- fied and

I. Scott MacKenzie; R. William Soukoreff

2002-01-01

406

COLLEGE OF LIBERAL ARTS Introduction to Research in Communication Sciences and Disorders  

E-print Network

Required text: Evaluating Research in Communication Disorders, by Schiavetti and Metz (2006) Grading policyCOLLEGE OF LIBERAL ARTS Introduction to Research in Communication Sciences and Disorders SLHS 444 design and strategies, model and theory development, research ethics, and concepts related to data

Heinz, Michael G.

407

The Manipulative Nature of Health Communication ResearchEthical Issues and Guidelines  

Microsoft Academic Search

Researchers and academics have accumulated a great deal of knowledge on how to manipulate individuals' behaviors. Although health communication researchers and practitioners prefer to call their work public health campaigns or health education mterventions, the truth is that their ultimate goal is to manipulate people into practicing healthy behaviors. As health communication research and practice moves into the 21 st

Kim Witte

1994-01-01

408

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

409

IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, ACCEPTED FOR PUBLICATION 1 Vehicular Passenger Mobility-Aware  

E-print Network

for vehicular networks, mobile hotspot, which introduces an integrated architecture of wireless local area networks (WLAN) and wireless wide area networks (WWAN). Mobile hotspots can provide ex- tended service of both call admission control and bandwidth adjustment functions to lower handoff vehicle service

Shen, Xuemin "Sherman"

410

Improving Mobile Solution Workflows and Usability Using Near Field Communication Technology  

Microsoft Academic Search

Organisations want nowadays more controlled processes and easily usable solutions, but achieving them requires winning many challenges. Radio Frequency Identification (RFID) based technology has been proposed for im- proving mobile solution workflows and usability. NFC (Near Field Communi- cation) technology is based on integrating RFID on mobile devices. This paper identifies how NFC based systems could be used to improve

Päivi Jaring; Vili Törmänen; Erkki Siira; Tapio Matinmikko

2007-01-01

411

The DRL Underwater Sensor Network: Supporting Dual Communications, Sensing, and Mobility  

E-print Network

network supports mobile nodes such as our underwater robot called the Au- tonomous Modular Optical in the ocean. The hardware consists of static sensor network nodes and mobile robots that are dually networked Underwater Robot (AMOUR), shown in Figure 2. It is 11kg. with a maximum speed of 1m/s. It has a battery life

Farritor, Shane

412

A Study of the Relationship of Communication Technology Configurations in Virtual Research Environments and Effectiveness of Collaborative Research  

E-print Network

because of the rising cost of traditional scientific scholarly communication, the growing importance of shared academic research by geographically dispersed scientific teams, and changes in the corporate research structures. New facilities provided...

Ahmed, Iftekhar

2010-01-16

413

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

NASA Technical Reports Server (NTRS)

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. Presently there is no frequency assignment for this service, and it is recommended that an allocation be pursued. The satellite system appears to be within reasonable extrapolation of the state of the art. It is further recommended that the satellite-aided system spacecraft definition studies and supporting technology development be initiated.

Anderson, R. E.

1979-01-01

414

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

415

MAP Receiver with Spatial Filters for Suppressing Cochannel Interference in MIMO-OFDM Mobile Communications  

NASA Astrophysics Data System (ADS)

This paper proposes joint maximum a posteriori (MAP) detection and spatial filtering for MIMO-OFDM mobile communications; it offers excellent receiver performance even over interference-limited channels. The proposed joint processor consists of a log likelihood generator and a MAP equalizer. The log likelihood generator suppresses cochannel interference by spatially filtering received signals and provides branch metrics of transmitted signal candidates. Using the branch metrics, the MAP equalizer generates log likelihood ratios of coded bits and performs channel decoding based on the MAP criterion. In the first stage, the log likelihood generator performs spatio-temporal filtering (STF) of the received signals prior to the fast Fourier transform (FFT) and is referred to as preFFT-type STF. Estimation of parameters including tap coefficients of the spatio-temporal filters and equivalent channel impulse responses of desired signals is based on the eigenvalue decomposition of an autocorrelation matrix of both the received and transmitted signals. For further improvement, in the second stage, the generator performs spatial filtering (SF) of the FFT output and is referred to as postFFT-type SF. Estimation of both tap coefficients of the spatial filters and channel impulse responses employs the recursive least squares (RLS) with smoothing. The reason for switching from preFFT-type STF into postFFT-type SF is that preFFT-type STF outperforms postFFT-type SF with a limited number of preamble symbols while postFFT-type SF outperforms preFFT-type STF when data symbols can be reliably detected and used for the parameter estimation. Note that there are two major differences between the proposed and conventional schemes: one is that the proposed scheme performs the two-stage processing of preFFT-type STF and postFFT-type SF, while the other is that the smoothing algorithm is applied to the parameter estimation of the proposed scheme. Computer simulations demonstrate that the proposed scheme can achieve excellent PER performance under interference-limited channel conditions and that it can outperform the conventional joint processing of preFFT-type STF and the MAP equalizer.

Lisheng, Fan; Fukawa, Kazuhiko; Suzuki, Hiroshi; Suyama, Satoshi

416

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

417

Color-filter-free spatial visible light communication using RGB-LED and mobile-phone camera.  

PubMed

A novel color-filter-free visible-light communication (VLC) system using red-green-blue (RGB) light emitting diode (LED) and mobile-phone camera is proposed and demonstrated for the first time. A feature matching method, which is based on the scale-invariant feature transform (SIFT) algorithm for the received grayscale image is used instead of the chromatic information decoding method. The proposed method is simple and saves the computation complexity. The signal processing is based on the grayscale image computation; hence neither color-filter nor chromatic channel information is required. A proof-of-concept experiment is performed and high performance channel recognition is achieved. PMID:25607019

Chen, Shih-Hao; Chow, Chi-Wai

2014-12-15

418

Experimental thermographic analysis of thermal effects induced on a human head exposed to 900MHz fields of mobile phones  

Microsoft Academic Search

This paper summarizes the results of an experimental research of thermal effects induced by electromagnetic exposure to wireless mobile communication equipment. A series of experiments has been performed in order to examine the time evolution of the temperature of some body-part surfaces exposed to electromagnetic radiation emitted by global system for mobile communication mobile phones (900 MHz). Special attention has

Maria Daria Taurisano; André Vander Vorst

2000-01-01

419

Mobile Aerial Tracking and Imaging System (MATRIS) for Aeronautical Research  

NASA Technical Reports Server (NTRS)

A mobile, rapidly deployable ground-based system to track and image targets of aeronautical interest has been developed. Targets include reentering reusable launch vehicles (RLVs) as well as atmospheric and transatmospheric vehicles. The optics were designed to image targets in the visible and infrared wavelengths. To minimize acquisition cost and development time, the system uses commercially available hardware and software where possible. The conception and initial funding of this system originated with a study of ground-based imaging of global aerothermal characteristics of RLV configurations. During that study NASA teamed with the Missile Defense Agency/Innovative Science and Technology Experimentation Facility (MDA/ISTEF) to test techniques and analysis on two Space Shuttle flights.

Banks, Daniel W.; Blanchard, R. C.; Miller, G. M.

2004-01-01

420

76 FR 17347 - Aviation Communications  

Federal Register 2010, 2011, 2012, 2013, 2014

...Aeronautical Mobile Satellite (Route) Service...air-to-air communications in Hawaii...Aeronautical Mobile Satellite (Route) Service...air-to-air communications in Hawaii...requiring that mobile satellite systems accord...to AMS(R)S communications in...

2011-03-29

421

Nonverbal Communication. Third Edition. What Research Says to the Teacher.  

ERIC Educational Resources Information Center

Based on the premise that effective teaching depends on successful communication, this booklet discusses the nonverbal dimension of communication. The booklet contends that humans use nonverbal communications for the following reasons: (1) words have limitations; (2) nonverbal signals are powerful; (3) nonverbal messages are likely to be more…

Miller, Patrick W.

422

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

423

IEEE Communications Magazine July 200394 0163-6804/03/$17.00 2003 IEEE COLLABORATIVE RESEARCH IN  

E-print Network

for last-mile deployment and increased capacity of mobile services. Initially, the goal of smart antenna sys- tems, smart antennas may be combined with interference-canceling multi-user receivers. During of antenna arrays to wireless and cellular communications systems has exploded, largely due to new

Blostein, Steven D.

424

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

425

Near Field Communication Technology as the Key for Data Acquisition in Clinical Research  

Microsoft Academic Search

Electronic data capture systems are utilized to collect, document, and process research data for clinical trials. Ideally, the workflow of collecting the data could be simplified by using mobile clients that enable for data acquisition at the point-of-care. Mobile phones provide a range of features to act as data acquisition unit for clinical trials. A novel approach towards an automated

J. Morak; D. Hayn; P. Kastner; M. Drobics; G. Schreier

2009-01-01

426

78 FR 69018 - Improving the Resiliency of Mobile Wireless Communications Networks; Reliability and Continuity...  

Federal Register 2010, 2011, 2012, 2013, 2014

...of major storms, including Superstorm Sandy in 2012, have impaired mobile wireless service in affected regions. Hurricane...be considered ``operational''? Are there ambiguous or borderline cases in which a site may or may not be...

2013-11-18

427

A comparison of two methods to assess the usage of mobile hand-held communication devices.  

PubMed

ABSTRACT Objective: The purposes of this study were to: 1) examine agreement between self-reported measures of mobile device use and direct measures of use, and 2) understand how respondents thought about their device use when they provided self-reports. Methods: Self-reports of six categories of device use were obtained using a previously developed questionnaire, and direct measures of use were collected using a custom logging application (n = 47). Bland-Altman analyses were used to examine agreement between the two measurement approaches. Interviews targeted participants' experiences completing the device use section of the questionnaire. Results: Self-reports of use on a typical day last week overestimated logged use; overestimates tended to be low at low average usage times, and became more variable as usage time increased. Self-reports of use yesterday also exceeded logged use, however the degree of overestimation was less than for a typical day last week. Six themes were identified from interviews, including the thought process used by participants to arrive at usage and the ease of reporting usage. Discussion: It is challenging for respondents of this questionnaire to provide accurate self-reports of use. The source of this challenge may be attributed to the intrinsic difficulty of estimating use, partly due to the multiple functions of the devices as well as the variability of use both within a day and a week. Conclusion: Research investigating the relationship between device use and health outcomes should include a logging application to examine exposure simultaneously with self-reports to better understand the sources of hazardous exposures. PMID:25436479

Berolo, Sophia; Steenstra, Ivan; Amick, Benjamin C; Wells, Richard P

2014-12-01

428

Enabling Secure and Spontaneous Communication between Mobile Devices using Common Radio Environment  

Microsoft Academic Search

With the proliferation of mobile devices, spontaneous interactions between co-located devices that do not know each other a priori will become commonplace. Securing these interactions against eavesdropping and man-in-the-middle attacks is an important and challenging task. In this paper, we postulate that mobile devices that are positioned in close proximity may be able to derive a shared secret to secure

Alex Varshavsky; Anthony LaMarca; Eyal de Lara

2007-01-01

429

Wireless Networks 5 (1999) 467477 467 Active tracking: Locating mobile users in personal communication  

E-print Network

is evaluated under two registration strategies: The geographic-based strategy, currently used in cellular communication service networks Hanoch Levy and Zohar Naor Department of Computer Science, School of Mathematics Communication Service (PCS) networks is discussed. We propose a novel approach for reducing the wireless cost

Levy, Hanoch

430

Efficient tag-to-tag near field communication (NFC) protocol for secure mobile payment  

Microsoft Academic Search

Communication between the near field communication (NFC) devices occurs in a very close distance of less than 10 cm. In the NFC-based payment system, close proximity between devices will increase the security of transactions. The disadvantage is the interaction between devices requires more physical activity of device owners because the device must be brought near to other devices some times.

Emir Husni; Kuspriyanto; Noor Basjaruddin; Tito Purboyo; Sugeng Purwantoro; Huda Ubaya

2011-01-01

431

Designing public safety mobile applications for disconnected, interrupted, and low bandwidth communication environments  

Microsoft Academic Search

Public Safety emergency communication systems are crucial to effective incident and disaster response. Lack of situational awareness and communications are of the most cited factors that hamper Public Safety's ability to make critical decisions. In partnership with the Department of Homeland Security Science and Technology Directorate ({DHS} {S\\\\&T)}, {MIT} Lincoln Laboratory ({MIT} {LL)} developed the Next-Generation Incident Command System ({NICS)}

P. Erickson; A. Weinert; P. Breimyer; M. Samperi; J. Huff; C. Parra; S. Miller

2013-01-01

432

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

433

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

434

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

435

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

436

An Investigation into the Use of 3G Mobile Communications to Provide Telehealth Services in Rural KwaZulu-Natal.  

PubMed

Abstract Background: We investigated the use of third-generation (3G) mobile communications to provide telehealth services in remote health clinics in rural KwaZulu-Natal, South Africa. Materials and Methods: We specified a minimal set of services as our use case that would be representative of typical activity and to provide a baseline for analysis of network performance. Services included database access to manage chronic disease, local support and management of patients (to reduce unnecessary travel to the hospital), emergency care (up to 8?h for an ambulance to arrive), e-mail, access to up-to-date information (Web), and teleclinics. We made site measurements at a representative set of health clinics to determine the type of coverage (general packet radio service [GPRS]/3G), its capabilities to support videoconferencing (H323 and Skype™ [Microsoft, Redmond, WA]) and audio (Skype), and throughput for transmission control protocol (TCP) to gain a measure of application performance. Results: We found that none of the remote health clinics had 3G service. The GPRS service provided typical upload speed of 44 kilobits per second (Kbps) and download speed of 64?Kbps. This was not sufficient to support any form of videoconferencing. We also observed that GPRS had significant round trip time (RTT), in some cases in excess of 750?ms, and this led to slow start-up for TCP applications. Conclusions: We found audio was always so broken as to be unusable and further observed that many applications such as Web access would fail under conditions of very high RTT. We found some health clinics were so remote that they had no mobile service. 3G, where available, had measured upload speed of 331?Kbps and download speed of 446?Kbps and supported videoconferencing and audio at all sites, but we frequently experienced 3G changing to GPRS. We conclude that mobile communications currently provide insufficient coverage and capability to provide reliable clinical services and would advocate dedicated wireless services where reliable communication is essential and use of store and forward for mobile applications. PMID:24926731

Clarke, Malcolm; Mars, Maurice

2014-06-13

437

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

438

Improving gambling survey research using dual-frame sampling of landline and mobile phone numbers.  

PubMed

Gambling prevalence studies are typically conducted within a single (landline) telephone sampling frame. This practice continues, despite emerging evidence that significant differences exist between landline and mobile (cell) phone only households. This study utilised a dual-frame (landline and mobile) telephone sampling methodology to cast light on the extent of differences across groups of respondents in respect to demographic, health, and gambling characteristics. A total of 2,014 participants from across Australian states and territories ranging in age from 18 to 96 years participated. Interviews were conducted using computer assisted telephone interviewing technology where 1,012 respondents from the landline sampling frame and 1,002 from the mobile phone sampling frame completed a questionnaire about gambling and other health behaviours. Responses across the landline sampling frame, the mobile phone sampling frame, and the subset of the mobile phone sampling frame that possessed a mobile phone only (MPO) were contrasted. The findings revealed that although respondents in the landline sample (62.7 %) did not significantly differ from respondents in the mobile phone sample (59.2 %) in gambling participation in the previous 12 months, they were significantly more likely to have gambled in the previous 12 months than the MPO sample (56.4 %). There were no significant differences in internet gambling participation over the previous 12 months in the landline sample (4.7 %), mobile phone sample (4.7 %) and the MPO sample (5.0 %). However, endorsement of lifetime problem gambling on the NODS-CLiP was significantly higher within the mobile sample (10.7 %) and the MPO sample (14.8 %) than the landline sample (6.6 %). Our research supports previous findings that reliance on a traditional landline telephone sampling approach effectively excludes distinct subgroups of the population from being represented in research findings. Consequently, we suggest that research best practice necessitates the use of a dual-frame sampling methodology. Despite inherent logistical and cost issues, this approach needs to become the norm in gambling survey research. PMID:23288431

Jackson, Alun C; Pennay, Darren; Dowling, Nicki A; Coles-Janess, Bernadette; Christensen, Darren R

2014-06-01

439

Mobile Information and Communcation Systems  

NSDL National Science Digital Library

Mobile Information and Communication Systems (MICS) is part of the Swiss National Science Foundation's National Centres of Competence in Research. The goal of MICS is "to study fundamental and applied questions raised by new generation mobile communication and information services, based on self-organization." Its work addresses unanswered questions and issues surrounding aspects of self-organizing, distributed communication and information services. The group's investigations advance research on a range of issues in mathematics (statistical physics based analysis, information and communication theory), networking, signal processing, security, distributed systems, software architecture and economics. More information on MICS 11 "interacting projects" can be found in the Research Projects section of the website or by searching for publications in the Publications section. Also available are presentations made at various workshops and conferences, simulations and demonstrations of select algorithms, schemes and models, and information on programs available for undergraduate students.

2005-11-04

440

RESEARCH AREA -- MOBILE SOURCE EMISSIONS (EMISSIONS CHARACTERIZATION AND PREVENTION BRANCH, APPCD, NRMRL)  

EPA Science Inventory

The objective of this program is to characterize mobile source emissions which are one of the largest sources of tropospheric ozone precursor emissions (CO, NOx, and volotile organic compounds) in the U.S. The research objective of the Emissions Characterization and Prevention Br...

441

Mutation Research 616 (2007) 2433 Mobile element-based forensic genomics  

E-print Network

A. Walker1, Mark A. Batzer Department of Biological Sciences, Biological Computation of their characteristics make them ideally suited for use as tools in forensic genomic applications. These includeMutation Research 616 (2007) 24­33 Mobile element-based forensic genomics David A. Ray1,2, Jerilyn

Ray, David

442

Indigenous Population Mobilities and School Achievement: International Educational Research Itineraries, Issues and Implications  

ERIC Educational Resources Information Center

This paper situates the articles in this special theme issue of the "International Journal of Educational Research" within the broader global literature regarding the educational experiences and opportunities of mobile communities. The paper distils those articles' contributions to extending current understandings about the specific "itineraries"…

Danaher, P. A.

2012-01-01

443

EPA-ORD (ENVIRONMENTAL PROTECTION AGENCY'S OFFICE OF RESEARCH AND DEVELOPMENT) MOBILE INCINERATION SYSTEM TRIAL BURN  

EPA Science Inventory

This paper discusses testing of the EPA Mobile Incineration system developed through the Office of Research and Development for the purpose of destroying hazardous materials on site. The test program (Trial Burn) consisted of a series of five tests that were designed to evaluate ...

444

Services for International Researchers 5th Erasmus Staff Mobility Week 2014  

E-print Network

International Office - Research Unit Visiting professors per country (period 2009 ­ 2013) #12;Marie Sklodowska-Curie Erasmus Staff Mobility Week 2014 Marie Sklodowska-Curie Actions Individual Fellowship #12;Financial Marie Sklodowska-Curie Actions Individual Fellowship *adjusted through the application of a correction

Di Pillo, Gianni

445

Communication in bottlenose dolphins: 50 years of signature whistle research.  

PubMed

Bottlenose dolphins (Tursiops truncatus) produce individually distinctive signature whistles that broadcast the identity of the caller. Unlike voice cues that affect all calls of an animal, signature whistles are distinct whistle types carrying identity information in their frequency modulation pattern. Signature whistle development is influenced by vocal production learning. Animals use a whistle from their environment as a model, but modify it, and thus invent a novel signal. Dolphins also copy signature whistles of others, effectively addressing the whistle owner. This copying occurs at low rates and the resulting copies are recognizable as such by parameter variations in the copy. Captive dolphins can learn to associate novel whistles with objects and use these whistles to report on the presence or absence of the object. If applied to signature whistles, this ability would make the signature whistle a rare example of a learned referential signal in animals. Here, we review the history of signature whistle research, covering definitions, acoustic features, information content, contextual use, developmental aspects, and species comparisons with mammals and birds. We show how these signals stand out amongst recognition calls in animals and how they contribute to our understanding of complexity in animal communication. PMID:23649908

Janik, Vincent M; Sayigh, Laela S

2013-06-01

446

Application of mobile digital communications in law enforcement, an introductory planning guide  

NASA Technical Reports Server (NTRS)

A set of planning guidelines for the application of digital communications techniques to law enforcement use is presented. Some essential characteristics of digital techniques and their applications are outlined, as are some principles of system analysis, evaluation, and planning. Requirements analysis, system concept design, implementation planning, and performance and cost modeling are described and demonstrated with respect to this application problem. Information on law enforcement digital communications systems and equipment and a list of vendor sources are given in appendices.

Sohn, R. L.; Abraham, J. E.; Leflang, W. G.; Kennedy, R. D.; Wilson, J. H.; Gurfield, R. M.

1975-01-01

447

Affiliations, Emotion and the Mobile Phone  

Microsoft Academic Search

Over half of the world’s population is expected to be using mobile phones by 2009 and many have become attached to and even\\u000a dependent on this small electronic communications device. Drawing on seven years of research into the affective aspects of\\u000a mobile phone usage this chapter will examine ways that people in the UK have incorporated mobile phones into their

Jane Vincent; Surrey GU

2008-01-01

448

SCIENTIFIC COMMUNICATION: FIVE THEMES FROM SOCIAL SCIENCE RESEARCH  

Microsoft Academic Search

THE 5 THEMES ARE: (1) THE DESIRABILITY OF TAKING A SYSTEMIC VIEW OF THE SCIENTIFIC COMMUNICATION IN ANY DISCIPLINE, (2) SEVERAL CHANNELS MAY ACT SYNERGISTICALLY TO BRING ABOUT THE EFFECTIVE TRANSMISSION OF A MESSAGE, (3) INFORMAL AND UNPLANNED COMMUNICATION PLAYS A CRUCIAL ROLE IN THE SCIENCE INFORMATION SYSTEM, (4) SCIENTISTS CONSTITUTE PUBLICS, AND (5) SCIENCE INFORMATION SYSTEMS SERVE MULTIPLE FUNCTIONS.

HERBERT MENZEL

1966-01-01

449

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

450

Low earth orbit satellite based communication systems — Research opportunities  

Microsoft Academic Search

Telecommunication systems are undergoing revolutionary changes that are transforming society, changing the way in which industrial and service organizations operate, and are having a profound effect on the daily life of individuals. Low earth orbit satellite (LEOS) based communication systems are a new and exciting endeavor in reshaping the global communication network and the services that it provides. Huge investments

Bezalel Gavish

1997-01-01

451

The Research and Application of Freeport Communication of SIEMENS PLC  

Microsoft Academic Search

The communication between various PLC or PLC and special intelligent devices can be solved by programmed protocol under freeport mode of SIEMENS S7-200 PLC. Based on freeport communication mode function,PC\\/PLC long-distance control the smoothly startup and stop of asynchronous motor.

Ling Zhou; Jie Chen; Lixin Xu

2008-01-01

452

Research on the electromagnetic environment effect on wireless communication systems  

Microsoft Academic Search

With the increase in modern communication based on wireless technology, protection against electromagnetic environment effects (E3) on systems is becoming more important. This includes reducing the electromagnetic interference (EMI) and ensuring compatibility for communication systems within, and especially protecting data links and terminals against lightning and high-power electromagnetic pulse (HEMP) to achieve the normal operation of these systems. This paper

Zhou Changlin; Zhan Zhan; Qin Xuebing; Yang Hongtao; Zhu Weidong

2008-01-01

453

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

454

Perspectives on Individual Differences Affecting Therapeutic Change in Communication Disorders. New Directions in Communication Disorders Research  

ERIC Educational Resources Information Center

This volume examines the ramifications of individual differences in therapy outcomes for a wide variety of communication disorders. In an era where evidence-based practice is the clinical profession's watchword, each chapter attacks this highly relevant issue from a somewhat different perspective. In some areas of communication disorders,…

Weiss, Amy L., Ed.

2009-01-01

455

Analysis of beam-steering and directive characteristics of adaptive antenna arrays for mobile communications  

Microsoft Academic Search

Radiation patterns of planar, circular, and three-segment adaptive antenna arrays are analyzed and compared in view of applications in mobile radio. It is assumed that each array consisted of several subarrays, which themselves present vertical linear arrays (columns) of patch radiators, with prescribed magnitude and phase distributions that determine the beam shape in the vertical (elevation) direction. Weighting signals applied

V. Kallnichev

2001-01-01

456

Capacity of a Mobile Multiple-Antenna Communication Link in Rayleigh Flat Fading  

Microsoft Academic Search

We analyze a mobile wireless link comprising transmitter and receiver antennas operating in a Rayleigh flat-fading environment. The propagation coef ficients between every pair of transmitter and receiver antennas are statistically independent and un known; they remain constant for a coherence interval of symbol periods, after which they change to new independent values which they maintain for another symbol periods,

Thomas L. Marzetta; Bertrand M. Hochwald

1999-01-01

457

n an ad hoc network, mobile nodes communicate with each other using multihop wireless  

E-print Network

) to develop a routing frame- work for IP-based protocols in ad hoc networks. Our goal is to carry out a systematic performance study of two dynamic routing protocols for ad hoc networks: the Dynamic Source Routing routing protocols for mobile ad hoc networks. The rest of the article is organized as follows. In the fol

Belding-Royer, Elizabeth M.

458

Divergent Perspectives on Language-Discordant Mobile Medical Professionals' Communication with Colleagues: An Exploratory Study  

ERIC Educational Resources Information Center

Little is known about how language-discordant mobile medical professionals (MMPs), defined as doctors who work in foreign countries, cultures, and languages, interact with their colleagues. The number of MMPs around the world is growing, and their interactions with colleagues have direct consequences for both patients' health and their own…

Gasiorek, Jessica; van de Poel, Kris

2012-01-01

459

Socializing Messages in Blue-Collar Families: Communicative Pathways to Social Mobility and Reproduction  

ERIC Educational Resources Information Center

This study explicitly links processes of anticipatory socialization to social mobility and reproduction. An examination of the socializing messages exchanged between blue-collar parents (n = 41) and their children (n = 25) demonstrate that family-based messages about work and career seldom occur in straightforward, unambiguous ways. Instead,…

Lucas, Kristen

2011-01-01

460

Towards music download and radio broadcast convergence in mobile communications networks  

Microsoft Academic Search

The transition from physical to digital music distribution is bound to have profound implications on the music industry. So far, most of the activity related to digital music distribution has been centred on the fixed Internet. In the meantime, mobile operators have been making significant investments in extending their network capabilities to support data services. This paper includes an analysis

Sandro Grech; Sakari Luukkainen

2005-01-01

461

Performance Modeling and Analysis of a Handover Channel Exchange Scheme in Mobile Cellular Communication Systems  

Microsoft Academic Search

Properly designed handover procedures in cellular wireless systems are essential for maintaining continuity of a call in progress and for minimizing the probability of forced call termination and signaling and switching load on the network. In this paper, we model a channel exchange scheme that involves exchange of channels between two mobiles that are moving in opposite directions across the

Manpreet Singh Dang; Amol Prakash; Rajeev Shorey; Natwar Modani; Dinesh K. Anvekar

2000-01-01

462

Ethics of clear health communication: applying the CLEAN Look approach to communicate biobanking information for cancer research.  

PubMed

Cancer innovations, such as biobanking technologies, are continuously evolving to improve our understanding and knowledge about cancer prevention and treatment modalities. However, the public receives little communication about biobanking and is often unaware about this innovation until asked to donate biospecimens. It is the researchers' ethical duty to provide clear communications about biobanking and biospecimen research. Such information allows the public to understand biobanking processes and facilitates informed decision making about biospecimen donation. The aims of this paper are 1) to examine the importance of clear communication as an ethical imperative when conveying information about cancer innovations and 2) to illustrate the use of an organizing framework, the CLEAN ( C ulture, L iteracy, E ducation, A ssessment, and N etworking) Look approach for creating educational priming materials about the topic of biobanking. PMID:23124500

Koskan, Alexis; Arevalo, Mariana; Gwede, Clement K; Quinn, Gwendolyn P; Noel-Thomas, Shalewa A; Luque, John S; Wells, Kristen J; Meade, Cathy D

2012-11-01

463

Ethics of Clear Health Communication: applying the CLean Look approach to Communicate Biobanking Information for Cancer research  

PubMed Central

Cancer innovations, such as biobanking technologies, are continuously evolving to improve our understanding and knowledge about cancer prevention and treatment modalities. However, the public receives little communication about biobanking and is often unaware about this innovation until asked to donate biospecimens. It is the researchers’ ethical duty to provide clear communications about biobanking and biospecimen research. Such information allows the public to understand biobanking processes and facilitates informed decision making about biospecimen donation. The aims of this paper are 1) to examine the importance of clear communication as an ethical imperative when conveying information about cancer innovations and 2) to illustrate the use of an organizing framework, the CLEAN (Culture, Literacy, Education, Assessment, and Networking) Look approach for creating educational priming materials about the topic of biobanking. PMID:23124500

Koskan, Alexis; Arevalo, Mariana; Gwede, Clement K.; Quinn, Gwendolyn P.; Noel-Thomas, Shalewa A.; Luque, John S.; Wells, Kristen J.; Meade, Cathy D.

2013-01-01

464

Communication of research to practice in library and information science: Closing the gap  

Microsoft Academic Search

A widely held concern in library and information science (LIS) is that the relationship between research and practice, and particularly the communication of research to practice, is flawed. Through critical analysis of the literature, the authors examine the nature of the gap between research and practice, strategies to reduce the gap, and research on the effectiveness of the strategies. Eleven

Gaby Haddow; Jane E. Klobas

2004-01-01

465

Research of a portable atmospheric laser communication system  

NASA Astrophysics Data System (ADS)

A kind of portable atmosphere laser communication system based on fiber technology is designed by using Ethernet transceiver terminal and video-audio transceiver terminal with diode laser module and PIN diode, while a flexible connection is built between the terminal and the optical antenna connected by laser fiber. The application of EDFA technology, which realizes the amplification of the power of the 1550nm laser diode module, brings forth a more stable structure and easier deployment and testing in wild environment, and the communication distance can reach 2 kilometers with a transmission bandwidth of 100 MBit/s. Prototype experiments prove the good communication performance of this system.

Zeng, Wen-feng; Li, Dong; Li, Shen-peng; Tan, Wei; Yi, Zhigang

2013-08-01

466

Ultra-low Power Sensors with Near Field Communication for Mobile Applications  

Microsoft Academic Search

In this paper, we study the applicability of an emerging RFID-based communication technology, NFC (Near Field Communication),\\u000a to ultra-low power wireless sensors. We present potential application examples of passive and semi-passive NFC-enabled sensors.\\u000a We compare their NFC-based implementations to corresponding implementations based on short-range radios such as Bluetooth\\u000a and Wibree. The comparison addresses both technical properties and usability. We also

Esko Strömmer; Mika Hillukkala; Arto Ylisaukko-oja

467

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

468

14.33 Economics Research and Communication, Fall 2004  

E-print Network

This course will guide students through the process of forming economic hypotheses, gathering the appropriate data, analyzing them, and effectively communicating their results. All students will be expected to have ...

Ellison, Sara

469

The generation of simple compliance boundaries for mobile communication base station antennas using formulae for SAR estimation.  

PubMed

In this paper, a procedure is proposed for generating simple and practical compliance boundaries for mobile communication base station antennas. The procedure is based on a set of formulae for estimating the specific absorption rate (SAR) in certain directions around a class of common base station antennas. The formulae, given for both whole-body and localized SAR, require as input the frequency, the transmitted power and knowledge of antenna-related parameters such as dimensions, directivity and half-power beamwidths. With knowledge of the SAR in three key directions it is demonstrated how simple and practical compliance boundaries can be generated outside of which the exposure levels do not exceed certain limit values. The conservativeness of the proposed procedure is discussed based on results from numerical radio frequency (RF) exposure simulations with human body phantoms from the recently developed Virtual Family. PMID:19531847

Thors, B; Hansson, B; Törnevik, C

2009-07-01

470

Study on the spectral efficiency of SFH-GMSK in land mobile telephone communication by direct simulation  

NASA Technical Reports Server (NTRS)

A spread spectrum system, slow frequency hopping with GMSK (Gaussian minimum shift keying) modulation (SFH-GMSK), is proposed for mobile telephone communications. The system performance is evaluated using computer simulation and is compared with an unspread system. Results show that under multipath fading conditions, when the signal-to-noise ratio (SNR) is greater than 15 dB, slow frequency hopping gives some bit error rate improvement over the unspread system. Theoretical predictions indicate that a system efficiency of 20-65 users per cell can be achieved in the cellular configuration. Joint use of SFH-GMSK and FM is also investigated. It is shown that FM interference can cause serious degradation to the SFH-GMSK performance.

Bao, H.; Kwatra, S. C.; Kim, Junghwan; Stevens, G. H.

1990-01-01

471

A numerical coefficient for evaluation of the environmental impact of electromagnetic fields radiated by base stations for mobile communications.  

PubMed

The aim of this study is the development of an Electromagnetic Environmental Impact Factor (EEIF). This is a global parameter that represents the level of electromagnetic impact on a specific area due to the presence of radiating systems, such as base station (BS) antennas for mobile communications. The numerical value of the EEIF depends only on the electromagnetic field intensity, a well-defined physical quantity that can easily be measured or computed. The paper describes the significant parameters of the field distribution adopted to evaluate the EEIF, and the assumptions used to develop a proper scale of values. Finally, some examples of application of the EEIF method are analyzed for real situations in a typical urban area. PMID:20690166

Russo, P; Cerri, G; Vespasiani, V

2010-12-01

472

Research on telescope array for inter-satellites laser communication  

NASA Astrophysics Data System (ADS)

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 consist in non-mechanical adaptive fine pointing of the mainlobe and a reduction of terminal volume, mass and cost. First, the basic function, the interfaces, and the performance parameters of one telescope are given. Next, the structure of a receive telescope array are described, and then the performance parameters of this telescope array are discussed. The different performances including antenna gain and pattern of optical antenna and telescope array in inter-satellites laser communication system are given in this part. A quantitative assessment reveals that arrays using coaxial beam superposition are best suited for optical data communications. Based on this finding, the main characteristics of superimposing telescope arrays are calculated. And calculations prove that, in practical applications, telescope array has better performance than one telescope used in laser inter-satellites communication, and even more, the influence of incoherent background radiation is negligible. The analyses results show that smart antenna is better than optical antenna in this communication system. In many important aspects of phased array design, we will consider 1) Frequency Synchronization and 2) Beam steering as being of primary importance to the present analysis. Frequency synchronization is necessary for proper beam spatial coherence, while beam steering is critical to how this cohered beam is pointed in a desired direction. We will address system performance and implementation aspects of both issues in fiber optic control. Three basic architectures for beam steering control via optics have been reported and proposed.

Zhou, Li; Wen, Chuanhua

2006-09-01

473

Leadership in Computer-Mediated Communication: Implications and Research Directions  

Microsoft Academic Search

Despite the importance of interpersonal influence processes in computer-mediated communication (CMC) environments, the emergence and functioning of leaders in CMC settings remains unstudied. An initial model and propositions address the possible extension of selected leadership models beyond face-to-face (FTF) communications and into the non-face-to-face CMC environment. We (1) model relevant variables for CMC leadership, (2) briefly review the implications of

Gerard George; Randall G. Sleeth

2000-01-01

474

48 CFR 6.302-3 - Industrial mobilization; engineering, developmental, or research capability; or expert services.  

Code of Federal Regulations, 2013 CFR

...2013-10-01 false Industrial mobilization; engineering, developmental... 6.302-3 Industrial mobilization; engineering, developmental...or to achieve industrial mobilization...maintain an essential engineering,...

2013-10-01

475

48 CFR 6.302-3 - Industrial mobilization; engineering, developmental, or research capability; or expert services.  

Code of Federal Regulations, 2014 CFR

...2014-10-01 false Industrial mobilization; engineering, developmental... 6.302-3 Industrial mobilization; engineering, developmental...or to achieve industrial mobilization...maintain an essential engineering,...

2014-10-01

476

48 CFR 6.302-3 - Industrial mobilization; engineering, developmental, or research capability; or expert services.  

Code of Federal Regulations, 2012 CFR

...2012-10-01 false Industrial mobilization; engineering, developmental... 6.302-3 Industrial mobilization; engineering, developmental...or to achieve industrial mobilization...maintain an essential engineering,...

2012-10-01

477

Dual-Band Horn Array Design Using a Helical Exciter for Mobile Satellite Communication Terminals  

Microsoft Academic Search

A horn array antenna is proposed for dual-band and dual-polarization operation. The array is optimally designed to be used as a feeder in mobile satellite terminals with a hybrid antenna (HA) structure, but it can be also used independently as a phased array. The array has an oval-shaped rim to maximize the efficiency of the HA, and is composed of

Young-Bae Jung; Soon-Young Eom

2012-01-01

478

Multi-purpose HealthCare Telemedicine Systems with mobile communication link support  

PubMed Central

The provision of effective emergency telemedicine and home monitoring solutions are the major fields of interest discussed in this study. Ambulances, Rural Health Centers (RHC) or other remote health location such as Ships navigating in wide seas are common examples of possible emergency sites, while critical care telemetry and telemedicine home follow-ups are important issues of telemonitoring. In order to support the above different growing application fields we created a combined real-time and store and forward facility that consists of a base unit and a telemedicine (mobile) unit. This integrated system: can be used when handling emergency cases in ambulances, RHC or ships by using a mobile telemedicine unit at the emergency site and a base unit at the hospital-expert's site, enhances intensive health care provision by giving a mobile base unit to the ICU doctor while the telemedicine unit remains at the ICU patient site and enables home telemonitoring, by installing the telemedicine unit at the patient's home while the base unit remains at the physician's office or hospital. The system allows the transmission of vital biosignals (3–12 lead ECG, SPO2, NIBP, IBP, Temp) and still images of the patient. The transmission is performed through GSM mobile telecommunication network, through satellite links (where GSM is not available) or through Plain Old Telephony Systems (POTS) where available. Using this device a specialist doctor can telematically "move" to the patient's site and instruct unspecialized personnel when handling an emergency or telemonitoring case. Due to the need of storing and archiving of all data interchanged during the telemedicine sessions, we have equipped the consultation site with a multimedia database able to store and manage the data collected by the system. The performance of the system has been technically tested over several telecommunication means; in addition the system has been clinically validated in three different countries using a standardized medical protocol. PMID:12694629

Kyriacou, E; Pavlopoulos, S; Berler, A; Neophytou, M; Bourka, A; Georgoulas, A; Anagnostaki, A; Karayiannis, D; Schizas, C; Pattichis, C; Andreou, A; Koutsouris, D

2003-01-01

479

A New Frequency Partitioning and Allocation of Subcarriers for Fractional Frequency Reuse in Mobile Communication Systems  

NASA Astrophysics Data System (ADS)

Some OFDMA-based wireless commuication systems, e. g., Wireless Broadband Internet (WiBro) or Worldwide interoperability for Microwave Access (WiMAX), support frequency reuse of 1 to maximize spectral efficiency. One of the efficient methods to reduce co-channel interference (CCI) caused by frequency reuse is fractional frequency reuse (FFR). In this paper, we propose and validate a novel frequency partitioning method and subcarrier assignment mechanism to improve system and individual capacity of mobile systems using FFR.

Han, Seung Su; Park, Jongho; Lee, Tae-Jin; Ahn, Hyun Gi; Jang, Kyunghun

480

A second anniversary operational review of the OmniTRACS(R): The first two-way mobile Ku-band satellite communications system  

NASA Technical Reports Server (NTRS)

A novel two-way mobile satellite communications and vehicle position reporting system that is currently operational in the United States and Europe is described. The system characteristics and service operations are described in detail. Technical descriptions of the equipment and signal processing techniques are provided.

Jacobs, Irwin M.; Salmasi, Allen; Gilhousen, Klein S.; Weaver, Lindsay A., Jr.; Bernard, Thomas J.

1990-01-01

481

Recent trends in IP\\/NGEO satellite communication systems: transport, routing, and mobility management concerns  

Microsoft Academic Search

Non-geostationary (NGEO) satellite communication systems are seen as an attractive solution to realize the vision of anywhere, anytime pervasive access to the Internet. Their design and development have thus gained tremendous interest in the last few years. Commencing with a brief overview of general NGEO satellite configurations, this article next addresses the key technical difficulties in the development of NGEO

TARIK TALEB; Nei Kato; YOSHIAKI NEMOTO

2005-01-01

482

Title: Societal Communication and Brand Equity Abstract: Previous research on corporate social responsibility generally acknowledges that  

E-print Network

Title: Societal Communication and Brand Equity Abstract: Previous research on corporate social characteristics on brand equity. In this paper we draw on Keller's (2003) brand equity framework to derive communication supports brand equity building, which also depends on the perceived congruency between the firm

Paris-Sud XI, Université de

483

The Application of Communication Theory and Research in the Legal Community.  

ERIC Educational Resources Information Center

To help transfer communication theory to the real world, the University of Central Florida (Orlando) has applied communication theory and social science research techniques to answer questions raised by attorneys, judges, and others interested in the dynamics of the legal process. The social scientific techniques have thus far been applied in…

Taylor, K. Phillip

484

Edinburgh Research Explorer Public views of minority languages as communication or symbol  

E-print Network

Edinburgh Research Explorer Public views of minority languages as communication or symbol: the case of minority languages as communication or symbol: the case of Gaelic in Scotland' Journal of Multilingual immediately and investigate your claim. Download date: 11. Dec. 2014 #12;Public views of minority languages

Millar, Andrew J.

485

Information Literacy and Communication Research: A Case Study on Interdisciplinary Assessment  

ERIC Educational Resources Information Center

This report offers an interdisciplinary approach for conducting assessment on learning outcomes in undergraduate communication research skills where information literacy is embedded in the expected outcome. A Communication Studies department and the University Library piloted a two-year program to develop strategies for coordinated assessment that…

Natalle, Elizabeth J.; Crowe, Kathryn M.

2013-01-01

486

A 10Year Retrospective of Research in New Technologies for Health Communication  

Microsoft Academic Search

The use of new technologies is growing in virtually all areas of health communication, including consumer, patient, and provider education; decision and social support; health promotion; knowledge transfer; and the delivery of services. Many applications have the potential to make major contributions in meeting the needs of an unhealthy and aging population.Key questions confronting health communication research reflect long-standing concerns

L. Suzanne Suggs

2006-01-01

487

The Purebred and the Platypus: Disciplinarity and Site in Mass Communication Research.  

ERIC Educational Resources Information Center

Offers thoughts about some of the problems facing mass communication as a cultural practice by mapping briefly its historical constitutiveness (and the problems therein). Discusses the dimensions of communication research as site. Offers a diagnosis of how to view the avowed "fragmentation" of the field. (SR)

Kavoori, Anandam P.; Gurevitch, Michael

1993-01-01

488

Research-Based Instructions to Increase Communication Skills for Students with Severe Disabilities  

ERIC Educational Resources Information Center

Communication skills are of great importance for children with developmental disabilities to be functional and independent in their own lives. This paper provides results of a comprehensive literature review on current researched-based intervention strategies that appear effective to increase communication skills for students who have severe…

Pinto, Peg; Simpson, Cynthia; Bakken, Jeffrey P.

2009-01-01

489

NASA satellite communications application research, phase 2 addendum. Efficient high power, solid state amplifier for EHF communications  

NASA Astrophysics Data System (ADS)

This document is an addendum to the NASA Satellite Communications Application Research (SCAR) Phase 2 Final Report, 'Efficient High Power, Solid State Amplifier for EHF Communications.' This report describes the work performed from 1 August 1993 to 11 March 1994, under contract number NASW-4513. During this reporting period an array of transistor amplifiers was repaired by replacing all MMIC amplifier chips. The amplifier array was then tested using three different feedhorn configurations. Descriptions, procedures, and results of this testing are presented in this report, and conclusions are drawn based on the test results obtained.

Benet, James

1994-03-01

490

NASA satellite communications application research, phase 2 addendum. Efficient high power, solid state amplifier for EHF communications  

NASA Technical Reports Server (NTRS)

This document is an addendum to the NASA Satellite Communications Application Research (SCAR) Phase 2 Final Report, 'Efficient High Power, Solid State Amplifier for EHF Communications.' This report describes the work performed from 1 August 1993 to 11 March 1994, under contract number NASW-4513. During this reporting period an array of transistor amplifiers was repaired by replacing all MMIC amplifier chips. The amplifier array was then tested using three different feedhorn configurations. Descriptions, procedures, and results of this testing are presented in this report, and conclusions are drawn based on the test results obtained.

Benet, James

1994-01-01

491

Research on a human-symbiotic robot using inverted pendulum-type mobile base  

NASA Astrophysics Data System (ADS)

A human-symbiotic robot needs to provide both safety for human and function of avoiding dameges for the objects around the robot along with task performing ability. It is, however, not easy to be compatible with each other. We suggest a two wheeled inverted pendulum-type mobile robot which consists of a dual-manipulator system, a body with two links and a middle joint, and an inverted pendulum-type mobile base. The following three tasks are assigned to the robot as its basic functions: handling a small object on a desk or a floor, carrying a heavy object, and sitting down and standing up. The goal of this research is to realize above tasks with taking account of safety for human and the task performance ability. This paper presents the concept of the research and the specific way to realize these tasks and shows the mechanical design of the robot.

Tamura, Akiko; Takahashi, Takayuki

2005-12-01

492

Research on Formation of Microsatellite Communication with Genetic Algorithm  

PubMed Central

For the formation of three microsatellites which fly in the same orbit and perform three-dimensional solid mapping for terra, this paper proposes an optimizing design method of space circular formation order based on improved generic algorithm and provides an intersatellite direct spread spectrum communication system. The calculating equation of LEO formation flying satellite intersatellite links is guided by the special requirements of formation-flying microsatellite intersatellite links, and the transmitter power is also confirmed throughout the simulation. The method of space circular formation order optimizing design based on improved generic algorithm is given, and it can keep formation order steady for a long time under various absorb impetus. The intersatellite direct spread spectrum communication system is also provided. It can be found that, when the distance is 1?km and the data rate is 1?Mbps, the input wave matches preferably with the output wave. And LDPC code can improve the communication performance. The correct capability of (512, 256) LDPC code is better than (2, 1, 7) convolution code, distinctively. The design system can satisfy the communication requirements of microsatellites. So, the presented method provides a significant theory foundation for formation-flying and intersatellite communication. PMID:24078796

Wu, Guoqiang; Bai, Yuguang; Sun, Zhaowei

2013-01-01

493

Research on formation of microsatellite communication with genetic algorithm.  

PubMed

For the formation of three microsatellites which fly in the same orbit and perform three-dimensional solid mapping for terra, this paper proposes an optimizing design method of space circular formation order based on improved generic algorithm and provides an intersatellite direct spread spectrum communication system. The calculating equation of LEO formation flying satellite intersatellite links is guided by the special requirements of formation-flying microsatellite intersatellite links, and the transmitter power is also confirmed throughout the simulation. The method of space circular formation order optimizing design based on improved generic algorithm is given, and it can keep formation order steady for a long time under various absorb impetus. The intersatellite direct spread spectrum communication system is also provided. It can be found that, when the distance is 1?km and the data rate is 1?Mbps, the input wave matches preferably with the output wave. And LDPC code can improve the communication performance. The correct capability of (512, 256) LDPC code is better than (2, 1, 7) convolution code, distinctively. The design system can satisfy the communication requirements of microsatellites. So, the presented method provides a significant theory foundation for formation-flying and intersatellite communication. PMID:24078796

Wu, Guoqiang; Bai, Yuguang; Sun, Zhaowei

2013-01-01

494

Using mobile social media and GIS in health and place research  

Microsoft Academic Search

This paper presents new research methods that combine the use of location-based social media on mobile phones with geographic information systems (GIS) to explore connections between people, place, and health. It discusses the feasibility, limitations, and benefits of using these methods, which enable real-time, location-based, quantitative data to be collected on the recreation, consumption, and physical activity patterns of urban

Orit Ben-Harush; Julie-Anne Carroll; Brendan Marsh

2012-01-01

495

The Voice of Experience: How Social Scientists Communicate Family Research to Policymakers  

ERIC Educational Resources Information Center

Because scientific understanding of communicating family research to policymakers is incomplete, qualitative interviews were conducted with social scientists experienced in bridging the gulf between research and family policy. In keeping with the tenets of 2 communities and community dissonance theories, the underutilization of research in…

Friese, Bettina; Bogenschneider, Karen

2009-01-01

496

La Communicacion entre los Centros de Investigacion en Educacion (Communication among Educational Research Centers).  

ERIC Educational Resources Information Center

In Latin America there is a lack of communication concerning educational research. This lack has been underlined in many regional meetings, but no action has been taken. Possible steps that would lead to improvement include circulation of research summaries, both for completed and current works, efforts by research centers to organize meetings,…

Schiefelbein, Ernesto

1972-01-01

497

The Influence of Materials Science and Engineering Undergraduate Research Experiences on Public Communication Skills  

ERIC Educational Resources Information Center

Communicating research findings with others is a skill essential to the success of future STEM professionals. However, little is known about how this skill can be nurtured through participating in undergraduate research. The purpose of this study is to quantify undergraduate participation in research in a materials science and engineering…

Ing, Marsha; Fung, Wenson W.; Kisailus, David

2013-01-01

498

Risky, aggressive, or emotional driving: Addressing the need for consistent communication in research  

Microsoft Academic Search

Problem. Researchers agree that a consistent definition for aggressive driving is lacking. Such definitional ambiguity in the literature impedes the accumulation of accurate and precise information, and prevents researchers from communicating clearly about findings and implications for future research directions. This dramatically slows progress in understanding the causes and maintenance factors of aggressive driving. Summary. This article critiques prevailing definitions

Chris S. Dula; E. Scott Geller

2003-01-01

499

The design and performance of a modem for land mobile satellite communications  

NASA Technical Reports Server (NTRS)

The digital implementation and performance of a multipath fade-tolerant differentially coherent 8-PSK-based modem for a land mobile satellite experiment (MSAT-X) program is described. At the receiver, differential detection using a matched filter arrangement and feedforward Doppler compensation is employed to achieve several operational benefits. For this L-band satellite link, the channel utilization is an efficient 1.0 bps/Hz for raw data and 1.5 bps/Hz for coded data. The experimental data analysis shows that the modem functions over the fading channel and performs within 1 dB of theoretical or simulation estimates.

Jedrey, T. C.; Lay, N. E.; Rafferty, W.

1988-01-01

500

The complexity of social mobilization in health communication: top-down and bottom-up experiences in polio eradication.  

PubMed

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 informational perspectives to a focus on emerging challenges in polio eradication efforts and new levels of complexity to SM. We examine available literature on communication and public health, available data on SM experiences that support polio eradication in Africa and Asia, and field work conducted by the authors where polio eradication efforts are ongoing. Our analysis suggests that (1) SM should not be casually approached as a top-down informational strategy to advance pre-established health goals; (2) centralized strategies hardly amount to SM; and (3) hybrid options that combine both activist and pragmatic SM are concrete possibilities for global health initiatives. In the context of renewed global democratization and persistent conflicts rooted in ethnicity, religion, and economics, it cannot be assumed that communities will either diligently espouse global goals or necessarily oppose them. Communication and SM strategies should rely on a clear understanding of the motives and agendas of involved actors. Resistance or opposition are important analytical dimensions as they may uncover new opportunities for effective health interventions. Further studies using these perspectives should be a priority for global health programs, including studies of the trust level, or lack thereof, among social actors. PMID:20455165

Obregón, Rafael; Waisbord, Silvio

2010-01-01