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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

Notes on the Interplay of Research on Media Space and Mobile Communication  

Microsoft Academic Search

In this chapter, we argue for the mutual relevance of media space and mobile communications researches. Surveying the two literatures, we note that the findings of media space research are often echoed by later mobile communication research and discuss some of the ideas they hold in common. However, mobile phones are used in a more diverse environment, both organizationally and

Paul M. Aoki; Margaret H. Szymanski; Allison Woodruff

3

Research of Mobile Banking Service in China: A Cross Rode of Communication Technology and Financial Innovation  

Microsoft Academic Search

The research and comparative of the experiences that mobile phone banking business developed in different countries demonstrates that with the development of communication technology and its support, phone banking as a combination of electronic money and mobile communications has become an example that IT leads the development of finance. After exploring lots of convenience and advantages that mobile banking can

Sheng Min; Chi Fei

2009-01-01

4

Mobile communications - an overview  

Microsoft Academic Search

This article focuses on voice communications using mobile (cell) phones over mobile\\/cellular networks. The advances in processors, memory, signal processing, communication technologies, and several related techniques, personal mobile communications has witnessed tremendous growth. A typical mobile communication network consists of: mobile devices, BS, mobile switching centers, gateway mobile switching center. Cell phones communicate wirelessly with BSs. Base stations communicate with

S. R. Subramanya; B. K. Yi

2005-01-01

5

Research Advances on RF Technologies for 3G\\/B3G Mobile Communications  

Microsoft Academic Search

In this paper, the research progress in RF technologies for 3G and B3G mobile communication systems in the State Key Laboratory of Millimeter Waves, Southeast University, P. R. China is briefly described including the RF modules for cdma2000, WCDMA and TD-SCDMA handsets, the RF subsystems for CDMA2000, WCDMA and B3G\\/4G systems.

Wei Hong; Jianyi Zhou; Wei Jiang; Haiming Wang; Jin Liu; Xiaowei Zhu; Jianing Zhao; Lei Zhang

2007-01-01

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

Application of Mobile Router to Military Communications.  

National Technical Information Service (NTIS)

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

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

2002-01-01

8

Mobile satellite communications  

NASA Astrophysics Data System (ADS)

Mobile satellite communications is placed in a global perspective with attention focused on the various commercial systems currently available and those recently proposed. The technology behind the systems is discussed as well as military applications. Mobiles are also examined in terms of commercial competition and politics.

9

Mobile telecommunication: Current knowledge on risk perception and risk communication: Results gained within the German Mobile Telecommunication Research Programme  

Microsoft Academic Search

Factors influencing the public' risk perception have already been investigated since the 70s of the last century. With the increased use of mobile telecommunication and the increased public attention to potential health risks from electromagnetic fields, the risk perception and society's dealing with the topic “mobile telecommunication” came into focus. From 2002 to 2008, the German Mobile Telecommunication Research Programme

Poelzl Christiane

2011-01-01

10

Vehicle antennas for mobile satellite communications  

NASA Astrophysics Data System (ADS)

Research on and the state of the art of vehicle antennas for mobile satellite communications are reviewed. Particular attention is given to the concept of mobile satellite communication; system requirements for vehicle antennas; antenna systems for communications, navigation, and broadcasting; and future prospects of vehicle antennas. A monolithic microwave integrated circuit active phased array antenna is considered to be a key technology in the future mobile satellite communications.

Ohmori, Shingo

1991-10-01

11

Effects of Mobile Communication  

Microsoft Academic Search

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

Scott W. Campbell

12

Mobile IP LAN for ARL Mobile Communications/Networking Testbed.  

National Technical Information Service (NTIS)

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

B. B. Luu

2001-01-01

13

An ethnography of communication approach to mobile product testing  

Microsoft Academic Search

Product testing of mobile communication technology has typically employed the same research methodologies that were traditionally applied to stationary technology. An approach that does not primarily rely on physical location to study mobile communication technologies is thus needed. The stable component of mobile communication technology is not physical space but human communication. Therefore, a research model is developed based on

Linda M. Gallant

2006-01-01

14

Telemedicine by mobile communication.  

PubMed

A concept of mobile telemedicine has been proposed to provide emergency care in a moving vehicle. The practicality of this technique was investigated through technical considerations required to realize mobile telemedicine. Some problems with this technique were identified, and measures to resolve the problems were devised. Then, theoretical analysis verified the feasibility of the proposed technique. Different multiplexing techniques for the multiple medical data transmission by mobile communication were investigated. An experimental system that can simultaneously transmit color images, an audio signal, three-channel ECGs, and blood pressure from a moving vehicle to a fixed station was developed. Experiments on the transmission of multichannel medical data from a moving ambulance, a navigating ship, and a flying aircraft were conducted. The results of these experiments verified the practical feasibility of the proposed technique. In the practical application of this technique, there may be some legal problems: for example, whether medical treatment through a communication medium would be legally acceptable or not, and whether the transmission of medical data violates the protection of personal privacy. However, considering the emergency nature of this technique and the significance of the results, both problems seem to be either legally or technically solvable. This application of mobile communication to telemedicine is not confined to merely a proposal to use new techniques. It can also bring about a methodological change in the concept of conventional telemedicine by changing it from static to dynamic, and by enlarging its scope from a local area to a global or cosmic area. It may also have an impact on conventional emergency medicine in that it will open up a new field of application that applies to moving vehicles. PMID:10429900

Shimizu, K

15

SAFETY DISTANCES IN MOBILE COMMUNICATIONS  

Microsoft Academic Search

For more than 60 years the electromagnetic spectrum has been used from most people solely for receiving broadcast and TV. Since several years individual mobile communication leads not only to a rise in spectrum use but also to a growing number of mobile base stations. The increasing number of these base stations in mobile communications causes considerations about possible adverse

MICHAEL BALDAUF; ALEXANDER HERSCHLEIN; WERNER SÖRGEL; WERNER WIESBECK

16

Research on Food Allergy Information using Smart Mobile Media Devices to Enhance Communication at Restaurants  

Microsoft Academic Search

Dealing with food allergies in the restaurant industry is becoming important as more customers have needs and restaurants are concerned with corporate social responsibilitiy (CSR). This research discusses how to provide information to facilitate the communication between the restaurant industry that is interested in dealing with food allergies and the patient’s family who wants to enjoy eating at restaurants. The

Mikako Ogawa; Ayaka Tanaka; Keiichi Noda; Ayako Kawai; Donald L. Amoroso

2012-01-01

17

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

Microsoft Academic Search

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

Christine Dietmar; Georg F. Kircher; Isabel Schlote

18

Mobile Communication: The Misunderstood User  

Microsoft Academic Search

With more than 2 billion users in the world, mobile communication has become a global phenomenon. Growing integration with traditional and new media transformed the traditional mobile device into a small multimedia computer. However, while institutions consider converging technologies as the enabler of an Information Society for All, in which user-citizens self-organize, produce and share knowledge, enterprises still develop services

Giuseppe Lugano; Anna Kämäräinen; Tero Heiskainen

19

Security Aspects of Mobile Communications  

Microsoft Academic Search

Security requirements and services of a mobile communication system differ, due to the radio communication between the user and the base station, extensively from those of a fixed network. There is no physical link in the form of a (fixed) telephone line between the user and the local exchange, which could serve to identify the user for routing and charging

Klaus Vedder

1991-01-01

20

SMS Encryption for Mobile Communication  

Microsoft Academic Search

This paper deals with an SMS encryption for mobile communication. The transmission of an SMS in GSM network is not secure, therefore it is desirable to secure SMS by additional encryption. In the following text, there are compared differences in the use of symmetric and asymmetric cryptography for SMS transfer securing. In the next part, there is the description of

D. Lisonek; M. Drahansky

2008-01-01

21

Competition in UK mobile communications  

Microsoft Academic Search

Since mobile communications began in the United Kingdom in 1985, with the licensing of two cellular networks, the number of subscribers has grown to eight million. Much of this growth has occurred in the past five years, which have also seen the emergence of new competition in the form of two PCN operators. The aim of this paper is to

Tommaso M Valletti; Martin Cave

1998-01-01

22

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.

23

User mobility and channel holding time in mobile communications  

Microsoft Academic Search

An important parameter in the analysis of a communication system is the channel holding time of a call. In a mobile communication system, the cell channel holding time may be different than the call duration due to the mobility of the user. To study this impact of the user mobility, a new and general mobility model is presented and analyzed.

Harry Heffes; Kevin M. Ryan

1997-01-01

24

Present situation and future development of multiple mobile robot communication technology  

Microsoft Academic Search

Mobile robot communication technology is one of the important research domains of multiple mobile robot cooperation technologies. It includes communication of the master to the slavers in which wireless mode is widely adopted and the slavers to slavers. This paper discusses the present situation of the key technologies in multiple mobile robot communication, include communication, topology structure, communication model and

Zhou Yun; Zhang Yong-qiang; Zhou Wan-zhen

2010-01-01

25

Does technological standardization enhance or inhibit firm's capabilities? Research on dynamic capabilities in the mobile communication market  

Microsoft Academic Search

Mobile communication market presents drastically technology changes from the first generation (1G), second generation (2G), third generation (3G) and next fourth generation(4G) in progress. It's also apparently characterized with the industry standardization, which specifies compatibility and interoperability of the product, with the objective of increasing the efficiency of economic activity. Standardization will convey direct competitive advantage to the owner of

Hsiao-Chen Mei; Joseph L. Che; Shihmin Lo; Peter J. Sher

2010-01-01

26

Adaptive base station antennas for mobile communication systems  

Microsoft Academic Search

There has been a rapid increase in the number of mobile communication users, resulting in an equally rapid need for increased capacity in the networks. Extensive research and development work on advanced base station antennas for mobile communication is in progress at Ericsson. This includes both active and adaptive antenna systems. With the introduction of active antenna products, it is

Bjorn Johannisson

1998-01-01

27

Telemedicine using mobile satellite communication.  

PubMed

With a view to providing paramedical care within moving vehicles, a telemedicine technique using mobile satellite communication was proposed. With this technique, the diagnosis from a specialist and the emergency care under his/her instructions would be available on the spot without unnecessary delay. The characteristic problems of this technique were identified as: channel capacity, size of the system, reliability of vital sign transmission, real-time operation and electromagnetic interference. Measures against these problems were devised, and their effectiveness was analyzed. A data format was designed and an experimental system was developed. The system can simultaneously transmit a color image, an audio signal, 3 channels ECG and blood pressures from a mobile station to a ground station. It can transmit an audio signal and error control signals from a ground station to a mobile station in a full duplex mode. Fundamental transmission characteristics were measured in a fixed station. Finally, experiments of medical data transmission were conducted with a navigating ship and an aircraft flying an international route. The measured threshold values of C/N(o) to guarantee satisfactory data reception were well below the lower boundary of C/N(o) of the communication link. Consequently, the feasibility of this technique was verified. PMID:8070809

Murakami, H; Shimizu, K; Yamamoto, K; Mikami, T; Hoshimiya, N; Kondo, K

1994-05-01

28

Intelligent digital mobile communications network architecture  

Microsoft Academic Search

ital Mobile Communications Network which is based on the hierarchicalfunction arrangement. The network is layered to the intelligent layer and the transport layer. And each layer is also layered to several sub-hers. The network hasa capability which guarantees the mobility between plural mobile communications networks. The MSSP (multi-switch simultaneous paging) technique is applied in metropolitan areas io simultaneously page the

Akihisa NAKAJIMA; Masato EGUCHI; Takemi ARITA; Hideo TAKEDA

1990-01-01

29

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

30

Design of hybrid mobile communication networks for planetary exploration  

Microsoft Academic Search

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

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

2004-01-01

31

Using Group Communication to Support Mobile Augmented Reality Applications  

Microsoft Academic Search

Augmented reality and group communication in wire- less ad-hoc networks form relatively new fields of research. When using group communication ordering and timeliness requirements are important. Moreover, when using wire- less ad-hoc networks, the possibility of network partition is a serious consideration. In this paper we explore these three issues in the context of using group communication to support mobile

Niels Reijers; Raymond Cunningham; René Meier; Barbara Hughes; Gregor Gaertner; Vinny Cahill

2002-01-01

32

Antennas for mobile satellite communications  

NASA Astrophysics Data System (ADS)

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

Huang, John

1991-12-01

33

Hybrid Checkpoint Protocol for Supporting Mobile-to-Mobile Communication  

Microsoft Academic Search

Some information systems consist of mobile stations and fixed stations. Mission critical applications are required to execute fault-tolerance in these systems. However, the mobile stations support neither enough volume of storage, processing power nor battery capacity to provide reliable communication and computation. Thus, it is difficult for multiple mobile stations to synchronously take checkpoints. We propose a hybrid checkpointing protocol

Yoshinori Morita; Hiroaki Higaki

2001-01-01

34

Visualization Management for Mobile Communication Network Resource  

Microsoft Academic Search

We combine database and graphics technology to accomplish a visualization management for mobile communication network resource. The system not only can edit and search base station, fiber optic cable and cording hole et al. resource information not also manage these information with visual manner. The resource using case about mobile communication network may be showed by picture. We utilize artificial

Ling Lu; Yufeng Wang; Bin Tang

2009-01-01

35

Land mobile communications satellite missions in Europe  

NASA Astrophysics Data System (ADS)

A market survey of the potential needs for land mobile communications in Europe in 1995 and 2005 was carried out. There is an exploding demand for land mobile communications in Europe. This demand justifies that every effort be made to develop as fast as possible a compatible pan-European terrestrial mobile system. The potential remaining needs, outside of the presently planned terrestrial mobile system, which can be served only by satellite, could exceed the capacity of a single medium size communications satellite in the available state of the art technology.

Deverdiere, R.

1986-09-01

36

Mobile communication and the protection of children  

Microsoft Academic Search

Mobile phones and other smart connected devices have fundamentally changed contemporary life. Globally, we see unprecedented explosion of new generation mobile phones. More precisely, mobile communication is nowadays really pervasive in social life. For instance, children and young persons are emerging as active players in the wonderful world of ringing and being ringed. Many of them are attracted by intriguing

Rebecca Ong

2010-01-01

37

Architecture for Group Communication in Mobile Systems  

Microsoft Academic Search

In mobile computing systems the network configuration changes due to node mobility. The paper identifies the issues a group communication service has to take into account in order to handle node mobility. These include the need to identify the location of a node, and the ability to cope with inaccuracies in the determination of a group membership. A multi level

Ravi Prakash; Roberto Baldoni

1998-01-01

38

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

39

Resource Allocation Scheme to Minimize Communication Cost in Mobile Ad Hoc Computational Grids  

Microsoft Academic Search

Recent advancements in mobile computing and communication technologies has given rise to development of mobile ad hoc computational grids. The mobile ad hoc computational grids provide a software infrastructure to share computing resources in mobile ad hoc environments. The adaptation of computational grids in mobile ad hoc environments is not straightforward, and presents many research challenges due to node mobility

Sayed Chhattan Shah; Myong-Soon Park

2010-01-01

40

Teleoperation of robots via the mobile communication networks  

Microsoft Academic Search

Internet-based teleoperation is becoming an important research field in robotics. Most of existing works employed the wired Internet or wireless local area network to transmit signals, which largely limited the movement of the robots. This paper presented a teleoperation project based upon mobile communication networks. Using mobile networks as the wireless transmission media free robots from space restriction, which is

Y. Y. Li; W. H. Fan; Y. H. Liu; X. P. Cai

2005-01-01

41

Fuego: Experiences with Mobile Data Communication and Synchronization  

Microsoft Academic Search

In this paper, we present a summary of our experiences with mobile middleware research in the four-year Fuego Core project. The presented work focuses on data communication and synchronization. We present three middleware services for data communication and synchronization, namely the messaging, event, and file synchronizer services, and discuss their development and usage. We conclude with an integrated architecture of

Sasu Tarkoma; Jaakko Kangasharju; Tancred Lindholm; Kimmo E. E. Raatikainen

2006-01-01

42

Simulation of Rayleigh faded mobile-to-mobile communication channels  

Microsoft Academic Search

In this paper, we present new methods for simulation of narrowband wireless channels for mobile-to-mobile communication. Since the statistical properties of these channels are different from typical cellular radio channels, new methods are needed for their simulation. We present a \\

Chirag S. Patel; S. L. Stuber; Thomas G. Pratt

2003-01-01

43

Robust and affordable mobile communications for emergency management  

Microsoft Academic Search

During any emergency reliable communications can be a matter of life-and-death. First-responder communications are widely seen as a critical emergency management issue identified by Hurricane Katrina in the USA, and the Indian Ocean Tsunami of 2004. In cooperation with national, regional, and local emergency management organisations a US research consortium has developed and demonstrated robust and affordable mobile communications systems

Michael Bowman; James H. Graham Jr.; James Gantt

2007-01-01

44

Signals in mobile communications: A review  

Microsoft Academic Search

The signals in mobile communications are reviewed both in terms of the physical scenario and as the basis of the transfer function of the mobile channel. The transfer function is arranged to demonstrate the inherent limitations (the irreducible bit error rate effect) resulting from using single port antennas, in both narrow- and wide-band systems. A new model for the average

RODNEY G. VAUGHAN

1986-01-01

45

Downlink beamforming for cellular mobile communications  

Microsoft Academic Search

A new technique for downlink transmission beamformer design in cellular mobile communications systems using an antenna array at the base station is presented. The method is based on estimation of an underlying spatial distribution associated with each source's spatial downlink channel. The algorithm is “blind” in the sense that it depends only on uplink spatial channel statistics, requiring no mobile-to-base

Jason Goldberg; Javier R. Fonollosa

1997-01-01

46

Downlink beamforming in cellular mobile communications  

Microsoft Academic Search

A technique for downlink transmission beamformer design in cellular mobile communications systems using an antenna array at the base station is presented. The method is based on estimation of an underlying spatial distribution associated with each source's spatial downlink channel. The algorithm is “blind” in the sense that it depends only on uplink spatial channel statistics, requiring no mobile-to-base station

J. R. Fonollosa; Jason Goldberg; G. Vazquez

1997-01-01

47

User Centric Privacy in Mobile Communication Scenarios  

Microsoft Academic Search

One common assumption when defining location privacy metrics is that one is dealing with attackers whose objective is to re-identify an individual out of an anonymized data set. However, today's communication scenarios are more diverse. For instance, there are several entities involved in mobile location sharing between individuals. Hence, in a communication relation with a service provider (e.g. SNS or

Klaus Rechert; Sven Wohlgemuth; Isao Echizen; Noboru Sonehara

2011-01-01

48

Presenting sponsored content on a mobile communication facility  

US Patent & Trademark Office Database

Improved capabilities for positioning content on a mobile communication facility, based in part on the likelihood of interaction with the content, are disclosed for mobile communications facilities, such as cell phones. These and other capabilities are employed to improve the likelihood of user interaction with content presented to a mobile communication facility, such as positioning content to appropriate or desirable mobile communication facilities.

Ramer; Jorey (Brighton, MA); Soroca; Adam (Cambridge, MA); Doughty; Dennis (Brookline, MA)

2010-07-06

49

Study on application of DSR protocol to mobile communication system  

Microsoft Academic Search

In general, the base station (BS) is fixed in the mobile communication system, however, which will be altered in some especial situations. To ensure the better communication, both BSs and mobile stations (MSs) of mobile communication network should be able to move in the network, namely entire mobility, which doesn't affect the communication of MSs. However, the route between BSs

Zhiyong Shi; Shenquan Zhu; Zhenyu Zhang

2005-01-01

50

HUMAN CONSTRAINTS FOR MOBILE COMMUNICATIONS  

Microsoft Academic Search

Mobile networks are proliferating currently in the world with a rather high pace. The number of mobile telecom subscribers has already exceeded one billion and the number will exceed two billions before the year 2010. The big investements needed in the telecom infrastructure raise the question, how much revenues can the operators and other players expect from the investments and

Pasi Tyrväinen; Jari Veijalainen

51

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

Microsoft Academic Search

Today, mobile communications play a central role in the voice\\/data network arena. With the deployment of 3G just around the corner, new directions are already being researched. In this paper we address the evolution of mobile communications, from its first generation, 1G, to the latest 3G, and give a glimpse of the foreseeable future of Beyond 3G (B3G). In the

Vasco Pereira; Tiago Sousa; Paulo Mendes; Edmundo Monteiro

52

Mobile communication terminal and method therefore  

US Patent & Trademark Office Database

Control of setup of international calls in a mobile communication terminal is performed. The terminal is connected to a first mobile communication network that is operated by a first operator, and the method includes detecting a request to setup an international call, the request including a first symbol sequence including a country code and a subscriber identifier, selecting, in response to the detection, an operator prefix number, the operator prefix number specifying a second operator of a communication network that provides an international call setup service, creating a second symbol sequence including the operator prefix number, the country code and the subscriber identifier, and requesting a call setup with the subscriber via the second operator, the request including transmitting the second symbol sequence to the first mobile communication network.

2012-09-11

53

Mobile satellite communications for consumers  

NASA Astrophysics Data System (ADS)

The RadioSat system based on MSAT satellites and scheduled for launch in 1994 is described. The RadioSat system will provide integrated communications and navigation services to consumers, including nationwide digital audio broadcasts, data broadcasts, precision navigation, and two-way voice and data communications. Particular attention is given to the MSAT satellite system capabilities and economics. It is concluded that the RadioSat system will be capable of providing a low-cost, highly flexible two-way communications for consumers that can be adapted to various applications.

Noreen, Gary K.

1991-11-01

54

Reliability consideration of a mobile communication system with network congestion  

Microsoft Academic Search

High quality traffic for networks is urgently needed for mobile communication systems. Mobile stations frequently become unavailable due to communication errors generated by network congestion. Traffic congestion in a network system may occur intermittently and continue for a length of time, sometimes causing communication errors. If congestions happens during communication, communication errors occur and the communication is rejected. This paper

Mitsutaka Kimura; Kazumi Yasui; Toshio Nakagawa; Naohiro Ishii

2006-01-01

55

Health communication research.  

PubMed

In this special issue on health communication research, nine studies are presented on the following subjects: effectiveness of health education and promotion, an instrument for reviewing the effectiveness of health education and promotion, consumer awareness of health mass media campaigns, health counseling by primary health care personnel, cues to action in the process of changing lifestyle, perception of anti-smoking advertisement, reactions facing threat of nuclear accidents, the role of medical journalists, and the results of a multi-media course on urinary incontinency. The main focus is an effectiveness analysis, audiences studies and communication analysis in the broad field of health communication research. Several methodological issues are raised. Applications in the field of clinical health promotion, and patient education and counseling are stressed. PMID:9110827

Aarva, P; de Haes, W; Visser, A

1997-01-01

56

Generalizability in Communication Research.  

ERIC Educational Resources Information Center

|Notes that in communication research, attempts to enhance external validity usually focus on techniques to enhance surface representativeness. Suggests that the findings of a study should be examined in light of its contribution to theory. Argues surface representativeness is usually not a good indicator of contribution to theory. Suggests…

Shapiro, Michael A.

2002-01-01

57

Signal environment response of a generic mobile communication system  

Microsoft Academic Search

Mobile communication has been, and continues to be, an essential tactical requirement for many types of commercial and military operations involving cellular mobile communication systems, radio communication stations and mobile forces. Specific mobile unit requirements vary widely because of different needs and different traditional methods of satisfying such needs within the several branches of the customer. The system in object,

Servilio Sebastiani

1999-01-01

58

GLOBAL MOBILE SATELLITE COMMUNICATIONS: A REVIEW OF THREE CONTENDERS  

Microsoft Academic Search

The era of satellite-based mobile communications systems started with the first MARISAT satellite which was launched into a geostationary orbit over the Pacific Ocean in 1976 to provide communications between ships and shore stations. The combination of high cost and unacceptably large equipment has kept mobile satellite communications (MSC) systems from appealing to the wider market of personal mobile communications.

Gary M. Comparetto

1994-01-01

59

Novel implement for the mobile communication base transceiver station mechanism  

Microsoft Academic Search

A novel mobile communication base transceiver station architecture is considered. Moreover, we propose this new approach for constructing a dynamic mobile communication base station subsystem for all the wireless communication systems to reduce the cost of both fabrication and maintenance compared to existing approaches. This novel mobile communication base transceiver station system is employed to broadcast and receive radio signal

Ye Yan; Kwangsoo Kim; Jucheng Yang

2005-01-01

60

The Global System for Mobile Communications Short Message Service  

Microsoft Academic Search

This tutorial presents an overview of the Global System for Mobile Communications Short Message Service from the viewpoint of implementing new telematic services. The SMS offers the users of GSM networks the ability to exchange alphanumeric messages up to the limit of 160 characters. The tutorial is motivated by an acute absence of research publications in this field. The information

C. Peersman; S. Cvetkovic; P. Griffiths; H. Spear

2000-01-01

61

The Role of Mobile Phones in Family Communication  

ERIC Educational Resources Information Center

Whilst there is a wealth of research into family communication and family relationships, there is little information about whether (and if so how) mobile phones have impacted on these processes. The authors' study involved individual semi-structured interviews with 60 families, including parents/carers and young people aged 11-17, to investigate…

Devitt, Kerry; Roker, Debi

2009-01-01

62

The Role of Mobile Phones in Family Communication  

ERIC Educational Resources Information Center

|Whilst there is a wealth of research into family communication and family relationships, there is little information about whether (and if so how) mobile phones have impacted on these processes. The authors' study involved individual semi-structured interviews with 60 families, including parents/carers and young people aged 11-17, to investigate…

Devitt, Kerry; Roker, Debi

2009-01-01

63

Integrated Wireless Communication Protocol for Ad-Hoc Mobile Networks  

Microsoft Academic Search

Wireless ad-hoc networks have recently emerged as a relevant research topic. The management of ad hoc networks raises many interesting problems, and adding the mobility to the network's components in- creases the number of these challenges. The ap- proaches to the real-time communication among the network's units should guarantee robustness, flexi- bility and scalability, while meeting the timing con- straints

Tullio Facchinetti; Giorgio Buttazzo

2004-01-01

64

Time reversal communication with a mobile source.  

PubMed

Broadband underwater acoustic communication signals undergo either a compression or dilation in the presence of relative motion between a source and a receiver. Consequently, underwater acoustic communications with a mobile source/receiver require Doppler compensation through resampling. However, resampling may not be necessary when a channel-estimate-based time reversal approach is applied with frequent channel updates. Using experimental data (20-30?kHz), it is demonstrated that the performance of time reversal communication without resampling is similar to the case with resampling, along with the benefit of a modest computational saving. PMID:24116398

Song, H C

2013-10-01

65

Law Enforcement, Forensics and Mobile Communications  

Microsoft Academic Search

By the end of 2004, the GSM Association reported that over 600 networks in more than 200 countries were serving more than 1.2 billion users (1). This extraordinary devel- opment of inexpensive and flexible mobile communications is also a source of new security challenges. This paper briefly lists the forensic challenges raised by handsets and overviews the handset analysis techniques

Vanessa Gratzer; David Naccache; David Znaty

2006-01-01

66

Low-latency secure mobile communications  

Microsoft Academic Search

On the one hand, the challenge of meeting various security requirements in the mobile and wireless environment is difficult, compared to the fixed and wired environment, because of the very nature of radio communications. On the other hand, wireless networks such as GSM, PCS and CDMA, which are predominantly circuit-switched voice networks, have been shielded from the vulnerabilities that exist

Vinod Kumar Choyi; Michel Barbeau

2005-01-01

67

Optimized Antennas for Mobile Communication Base Stations  

Microsoft Academic Search

This is a synopsis of work conducted to improve the electrical and mechanical performance of antennas used for mobile communication base stations. To accomplish this we first consider the propagation characteristics to determine the optimal antenna pattern. In addition, the antennas mechanical size and profile are minimized to improve its appearance and mounting ease. The end result of this work

J. R. Sanford; J.-F. Zurcher; S. Robert

1991-01-01

68

Internet Pajama: A Mobile Hugging Communication System  

Microsoft Academic Search

Internet Pajama is a novel wearable system aimed at pro- moting physical interaction in remote communication be- tween parent and child. This system enables parent and child to hug one another through a novel hugging interface device and a wearable, hug reproducing jacket connected through the Internet. The hugging device is a small, mobile doll with embedded pressure sensing circuit

James Keng; Soon Teh; Adrian David Cheok; Tim Merritt; Roshan Peiris

69

A voice scrambler for mobile communication  

Microsoft Academic Search

A new voice scrambling method for mobile communication is proposed. The principle is to invert the voice sample polarity selectively according to the scrambling code, smooth it with a low-pass filter, and feed it to the radio transmitter. To utilize the principle, the necessary techniques such as filtering, synchronizing and scrambling code design, are described. The whitened spectrum of the

SHIGERU ASAKAWA; FUMIO SUGIYAMA; M. Nakamura

1980-01-01

70

The evolution of global mobile communications  

NASA Astrophysics Data System (ADS)

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

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

71

First Satellite Mobile Communication Trials Using BLQS-CDMA.  

National Technical Information Service (NTIS)

In this paper, technical results obtained in the first MSBN Land mobile technical trial are reported. MSBN (Mobile Satellite Business Network) is a new program undertaken by the European Space Agency (ESA) to promote mobile satellite communication in Euro...

M. Luzdemateo S. Johns M. Dothey C. Vanhimbeeck I. Deman

1993-01-01

72

Secure Communication in Global Systems for Mobile Telecommunications  

Microsoft Academic Search

The digital cellular mobile telecommunication systems have become the trend of future personal communications services (PCS). In order to satisfy the high quality of services, security functions have been embedded into new mobile communication systems. In this paper, we investigate the security issues in the mobile communication systems and focus especially on the security functions of the Global Systems for

Shiuh-Pyng Shieh; Chern-Tang Lin; Jung-Tao Hsueh

73

Ray-Tracing for Mobile Communications  

Microsoft Academic Search

For the parametrization and standardization of future mobile communications systems realistic values of the characteristic channel parameters are needed. Due to its ability to analyze the frequency-selective, time-variant as well as spa- tial behavior of the channel, ray-tracing is a popular channel characterization method. Moreover, it is capable to calculate very large structures (i.e. site-specific scenarios) with reasonable computation resources.

Sandra Knorzer; Thomas Fugen; Werner Wiesbeck

74

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

75

Voice communication research evaluation system  

Microsoft Academic Search

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

R. L. McKinley

1980-01-01

76

A Secure Protocol for Traffic Police Mobile Communication System  

Microsoft Academic Search

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

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

2009-01-01

77

Asian Communication: Research, Training, Planning.  

National Technical Information Service (NTIS)

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...

D. Lerner

1976-01-01

78

Inmarsat second generation satellites for mobile communications  

NASA Astrophysics Data System (ADS)

The second-generation satellites of Inmarsat (the International Maritime Satellite Organization) are in the final stage of integration and testing. The satellites will satisfy the needs originated by the rapid expansion of the system and will allow the introduction of new mobile communications services. The essentials of the spacecraft design and the types of services that will be provided using the new satellites are discussed, with particular consideration given to the characteristics of the communications transponder, its design and technology, the requirements and the design solutions, and the most significant communications parameters. Paralleled linearized traveling-wave amplifiers, L-band shaped global direct radiating array antennas, and surface-acoustic-wave channelization filters are being implemented in the system. Passive intermodulation product generation and multipaction are being recognized as design drivers.

Gambaruto, E.; Banks, D. K.; Krinsky, B.

79

Improving Communication for Mobile Devices in Disaster Response  

Microsoft Academic Search

During disaster response, networks can become overloaded and are susceptible to complete failure in the disaster area. This\\u000a disables mobile communication, hindering response efforts from mobile users. Mobile users make use of various heterogeneous\\u000a devices and require infrastructure to facilitate the communication of distributed information. Communication flow among mobile\\u000a users is disorganized as it is either too strong and hierarchical

Patricia Gómez Bello; Ignacio Aedo; Fausto Sainz; Paloma Díaz; Jennifer Munnelly; Siobhán Clarke

2007-01-01

80

Research in Communication Theory.  

National Technical Information Service (NTIS)

Results are presented in the areas of signal design bounds, spread spectrum communications, the partial correlation properties of gold codes, the design of special signal sets for good correlation, signal design for totally phase-incoherent communications...

L. R. Welch R. A. Scholtz

1976-01-01

81

Land mobile communications and position fixing using satellites  

Microsoft Academic Search

In a recent series of experiments, the General Electric Corporate Research and Development Center demonstrated effective satellite-aided land mobile communications, analog and digital data relay, and automatic real-time vehicle position fixing. In one sequence of tests a station wagon was equipped with a specially designed antenna, a slightly modified commercial VHF transceiver, and a digital tone-code ranging responder that operated

AXEL F. BRISKEN; ROY E. ANDERSON; RICHARD L. FREY; JAMES R. LEWIS

1979-01-01

82

New video applications on mobile communication devices  

NASA Astrophysics Data System (ADS)

The video applications on mobile communication devices have usually been designed for content creation, access, and playback. For instance, many recent mobile devices replicate the functionalities of portable video cameras and video recorders, and digital TV receivers. These are all demanding uses, but nothing new from the consumer point of view. However, many of the current devices have two cameras built in, one for capturing high resolution images, and the other for lower, typically VGA (640x480 pixels) resolution video telephony. We employ video to enable new applications and describe four actual solutions implemented on mobile communication devices. The first one is a real-time motion based user interface that can be used for browsing large images or documents such as maps on small screens. The motion information is extracted from the image sequence captured by the camera. The second solution is a real-time panorama builder, while the third one assembles document panoramas, both from individual video frames. The fourth solution is a real-time face and eye detector. It provides another type of foundation for motion based user interfaces as knowledge of presence and motion of a human faces in the view of the camera can be a powerful application enabler.

Silvén, Olli J.; Hannuksela, Jari; Bordallo-López, Miguel; Turtinen, Markus; Niskanen, Matti; Boutellier, Jani; Vehviläinen, Markku; Tico, Marius

2008-03-01

83

Mobile communication via satellite towards the year 2000  

NASA Astrophysics Data System (ADS)

Recently, mobile communication services are dramatically growing, and there is an ever increasing demand for these services. INMARSAT (International Maritime Satellite Organization) plays a very important role to establish mobile communication networks for ships and airplanes on the global basis. For personal mobile communication, INMARSAT is currently studying INMARSAT-P hand-held terminal in its Project 21. Several mobile satellite communication systems such as IRIDIUM and Globalstar systems are also proposed in order to realize personal communication services towards the 21st century. This paper presents a recent trend of mobile satellite communication systems mainly aiming at the realization of personal communication services. Activities of CCIR (International Radio Consultative Committee) and major results of WARC (World Administrative Radio Conference) '92 are also briefly introduced focusing on mobile satellite matters.

Hirata, Yasuo

84

Small Antennas for Mobile and Ultra-Wideband Communication  

Microsoft Academic Search

Mobile communication is an enormous growing market of communication and has a strong influence on the RF and microwave world. While UMTS is on the way of installation and going into business, new communication system technologies can be seen at the horizon of the communication world. One of this is UWB, the ultra wideband communication. This promising technology can become

D. Heberling; D. Manteuffel; M. Martínez-Vázquez; M. Geissler; O. Litschke

85

Model-based security analysis for mobile communications  

Microsoft Academic Search

Mobile communication systems are increasingly used in com- panies. In order to make these applications secure, the secu- rity analysis has to be an integral part of the system design and IT management process for such mobile communication systems. This work presents the experiences and results from the security analysis of a mobile system architecture at a large German telecommunications

Jan Jürjens; Joerg Schreck; Peter Bartmann

2008-01-01

86

Future Mobile Communication Networks: Challenges in the Design and Operation  

Microsoft Academic Search

In the past 20 years, mobile communications have evolved to the point where affordable broadband connectivity is widely available and plays a central role in today's information society. As mobile data rates are predicted to double annually in the next decade while the average revenue per user is likely to remain stagnate, the mobile communications industry is required to generate

Patrick Marsch; Bernhard Raaf; Agnieszka Szufarska; Preben Mogensen; Hao Guan; Michael Farber; Simone Redana; Klaus Pedersen; Troels Kolding

2012-01-01

87

Wide area mobile communication networks with multiple routing mode options  

Microsoft Academic Search

A wide area mobile communication network with multiple modes of transmission routing is described. This is achieved through the integration of multiple, independent wide area networks at both the fixed base station and the mobile device. Through this network, mobile communication devices have access to multiple rf transmission paths with varying characteristics of signal strength, coverage, data rates and cost.

David W. Best; Santanu Dutta; Dennis Sutherland

1995-01-01

88

The Communication Education Research Agenda.  

ERIC Educational Resources Information Center

|Suggests one way that the author would like to see communication educators build on the solid foundation of important communication education research successes. Concludes that contributions to this journal in the past have been much more systematic and thorough when focusing on the communication dimensions of teaching in general. Suggests that…

Friedrich, Gustav W.

2002-01-01

89

Mobile satellite communications systems - Toward global personal communications  

NASA Astrophysics Data System (ADS)

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 satellite communications systems are discussed. One approach emerging is the use of large satellites, with large antennas, operating at much higher carrier frequencies. A second approach is to use low-earth orbiting (LEO) satellites, in order to reduce the path loss. The LEO approach also results in much smaller propagation delays than those experienced with geostationary satellites.

Lodge, John H.

1991-11-01

90

Geographical dispersal of mobile communication networks  

NASA Astrophysics Data System (ADS)

In this paper, we analyze statistical properties of a communication network constructed from the records of a mobile phone company. The network consists of 2.5 million customers that have placed 810 million communications (phone calls and text messages) over a period of 6 months and for whom we have geographical home localization information. It is shown that the degree distribution in this network has a power-law degree distribution k and that the probability that two customers are connected by a link follows a gravity model, i.e. decreases as d, where d is the distance between the customers. We also consider the geographical extension of communication triangles and we show that communication triangles are not only composed of geographically adjacent nodes but that they may extend over large distances. This last property is not captured by the existing models of geographical networks and in a last section we propose a new model that reproduces the observed property. Our model, which is based on the migration and on the local adaptation of agents, is then studied analytically and the resulting predictions are confirmed by computer simulations.

Lambiotte, Renaud; Blondel, Vincent D.; de Kerchove, Cristobald; Huens, Etienne; Prieur, Christophe; Smoreda, Zbigniew; van Dooren, Paul

2008-09-01

91

Route Optimization for Intra Communication of a Nested Mobile Network  

Microsoft Academic Search

Network mobility, i.e. Internet access services for a moving network as a single unit brings about new challenging issues. A nested mobile network is a hierarchical form of multiple mobile networks. Nested mobile networks sufier from a pin- ball routing problem. This problem becomes more serious in the case of a communication between any two nodes in the same nested

Sungmin Baek; Jinkyu Yoo; Hosik Cho

92

Robotic Communication Terminals as a Mobility Support System for Elderly and Disabled People(2)  

NASA Astrophysics Data System (ADS)

We have been developing Robotic Communication Terminals (RCT) as a mobility support system for the elderly and disabled people, which assists for their impaired elements of mobility— recognition, actuation, and information access. The RCT consist of three types of terminals: “environment-embedded terminal”“user-carried mobile terminal”, and “user-carrying mobile terminal”. These terminals communicate with one another to provide the users with a comfortable means of mobility. In this paper, we introduce the overview of our research. The recent progress is also presented as well as the future plan.

Yairi, Ikuko Eguchi; Igi, Seiji

93

Mass Communication Researchers in Scandinavia.  

National Technical Information Service (NTIS)

Information in this directory of mass communication researchers in Denmark, Norway, and Finland is taken from questions which were distributed in the fall of 1977 and completed by the researchers themselves. Graduate students who are either working on res...

1978-01-01

94

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

95

Nar Kommunikasjonen Mobiliseres. En Kunnskapsstatus om Samspill Mellom IKT og Personlig Mobilitet (Mobilization of Communication).  

National Technical Information Service (NTIS)

This report examines the interplay between mobility transport and the use of information and Communication Technology. The report identifies three important strands of research-within transportation, ICT and urban geography-that have examined this interpl...

M. Gripsrud

2007-01-01

96

Mass Communication Researchers in Scandinavia.  

ERIC Educational Resources Information Center

Information in this directory of mass communication researchers in Denmark, Norway, and Finland is taken from questions which were distributed in the fall of 1977 and completed by the researchers themselves. Graduate students who are either working on research grants or have published academic papers on research in the field are included. Separate…

Nordic Documentation Center for Mass Communication Research, Aarhus (Denmark).

97

Communication Research in Urban Centers.  

ERIC Educational Resources Information Center

|Because of the great density of people in cities, residents of urban centers have unique problems of human interaction and communication. Because of population density and the large number of information networks, communication research in urban settings should center on the ways in which residents cope with the variety of message inputs and, at…

Hunt, Martin F., Jr.

98

The Evolution of Base Station Antennas for Mobile Communications  

Microsoft Academic Search

This paper gives a general overview of the design of base station antennas for mobile communications. It explains underlying theoretical and practical implementation aspects in mobile communication networks of today and the future. In the first part the fundamental parameters of a base station antenna are discussed in the context of radio network design. In particular we discuss parameters such

C. Beckman; B. Lindmark

2007-01-01

99

Spatial traffic estimation and characterization for mobile communication network design  

Microsoft Academic Search

This paper presents a new method for the estimation and characterization of the expected teletraffic in mobile communication networks. The method considers the teletraffic from the network viewpoint. The traffic estimation is based on the geographic traffic model, which obeys the geographical and demographical factors for the demand for mobile communication services. For the spatial teletraffic characterization, a novel representation

Kurt Tutschku; Phuoc Tran-Gia

1998-01-01

100

Optical Fiber Feeder for Microcellular Mobile Communication Systems (H-015)  

Microsoft Academic Search

The authors investigate the feasibility of using an optical fiber feeder for microcellular mobile communication systems. The optical feeder enables compact and low-cost base stations, easy radio channel control, and flexible mobile communication systems. Basic transmission characteristics were investigated through optical transmission experiments. Using these results, it is estimated that the optical feeder can transmit 880 telephone channels for digital

Makoto Shibutani; Toshihito Kanai; Watani Domom; Katsumi Emura; Junji Namiki

1993-01-01

101

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

102

Mobility management in current and future communications networks  

Microsoft Academic Search

This article describes current and proposed protocols for mobility management for public land mobile networks (PLMNs), Mobile IP, wireless ATM, and satellite networks. The integration of these networks is discussed in the context of the next evolutionary step of wireless communications networks. First, a review is provided of location management algorithms for PCS implemented over a PLMN. The latest protocol

L. F. Akyildiz; Janise McNair; Joseph Ho; H. Uzunalioglu; Wenye Wang

1998-01-01

103

Land mobile communications and position fixing using satellites  

Microsoft Academic Search

Relay of land mobile communications directly between the vehicles and central stations using VHF repeaters on satellites in geosynchronous orbits is examined. Experiments demonstrated effective satellite-aided land mobile communications, analog and digital data relay, automatic real-time vehicle position fixing; specially designed satellite antenna, and a digital tone-code ranging responder which operates within the communications bandwidth. A commercial VHF base station

A. F. Brisken; R. E. Anderson; R. L. Frey; J. R. Lewis

1979-01-01

104

Communication Research in the Design of Communication Interfaces and Systems.  

ERIC Educational Resources Information Center

Suggests that over the next 20 years the evolution of communication technologies may offer a critical opportunity for researchers to positively shape the channels of mediated human communication. Focuses on communication research's role in new communication media. Sketches out a possible research response: a "human factors approach" to…

Biocca, Frank

1993-01-01

105

78 FR 38361 - Certain Portable Electronic Communications Devices, Including Mobile Phones and Components...  

Federal Register 2010, 2011, 2012, 2013

...Communications Devices, Including Mobile Phones and Components Thereof; Institution...communications devices, including mobile phones and components thereof, by reason...communications devices, including mobile phones and components thereof, by...

2013-06-26

106

78 FR 32689 - Certain Portable Electronic Communications Devices, Including Mobile Phones and Components...  

Federal Register 2010, 2011, 2012, 2013

...Communications Devices, Including Mobile Phones and Components Thereof Notice...Communications Devices, Including Mobile Phones and Components Thereof, DN 2958...communications devices, including mobile phones and components thereof. The...

2013-05-31

107

The antenna system for the base station of mobile communication  

Microsoft Academic Search

The antenna system for a mobile communication base station in the meter (UHF) waveband is presented. Calculation of the antenna system is given and the effect of a mast on its radiation pattern rated. The designed antenna system allows the number of communication channels to be increased, increasing the communication range and improving its quality.

Aleksander V. Antonov; Yury M. Gerasimov

2003-01-01

108

Research in Communication Theory.  

National Technical Information Service (NTIS)

The major results of research performed on this grant have been published or are pending publication. This report contains the following abstracts which indicates the breadth and depth of results: The Spread Spectrum Concept; Group Characters: Sequences w...

R. A. Scholtz L. R. Welch

1979-01-01

109

Communication Research on Black Americans.  

ERIC Educational Resources Information Center

|This paper reviews the role of television in the lives of blacks and suggests approaches on how to improve the quality of communication research. Portrayals, exposure patterns, attitudes and motives, and effects of blacks on television are discussed. It is suggested that future research should emphasize interpretive analysis or assessment of the…

Allen, Richard L.

110

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

111

Secure groups communication for mobile agents based on public key infrastructure  

Microsoft Academic Search

The use of mobile agents based computing in this emerging world of electronic transaction is becoming increasingly prevalent due to the enormous benefits and services that can be derived from it. They are good for distributed applications and hence an excellent paradigm when group communications are involved. Secure group communication is a significant research area prompted by the growing popularity

Muhammad Aiman Mazlan; Azman Samsudin; Rahmat Budiarto

2003-01-01

112

Enhanced privacy and authentication for the global system for mobile communications  

Microsoft Academic Search

The Global System for Mobile Communications (GSM) is widely recognized as the modern digital mobile network architecture. Increasing market demands point toward the relevancy of security-related issues in communications. The security requirements of mobile communications for the mobile users include: (1) the authentication of the mobile user and Visitor Location Register\\/Home Location Register; (2) the data confidentiality between mobile station

Chii?Hwa Lee; Min?Shiang Hwang; Wei?Pang Yang

1999-01-01

113

A New Data Communication Protocol for Distributed Mobile Databases in Mobile Ad Hoc Networks  

Microsoft Academic Search

Three data communication methods can be provided in a MANET: data broadcast, data query, and peer-to-peer messaging. The formation of heterogeneous distributed mobile databases within a MANET that allows people to submit queries is becoming a reality. The goal of this paper is to integrate distributed mobile databases in MANETs and proposes a new data communication protocol that supports all

Afsaneh Rahbar; Mehran Mohsenzadeh; Amir Masoud Rahmani

2009-01-01

114

Simulation studies of the effects of user mobility on the handoff performance of mobile communications  

Microsoft Academic Search

The performance of soft handoffs of code division multiple access (CDMA) mobile communication systems is determined by several factors. Due to the importance of handoffs in mobile communications, several handoff methods have been proposed and evaluated through computer simulations. However, the credibility of simulation results depends on the objectivity of the assumptions made by the simulations. This paper presents a

Kyungsook Han

2002-01-01

115

Group Communications in Mobile Ad Hoc Networks  

Microsoft Academic Search

Efficient support of group communications is critical for most ad hoc network applications. However, manet group communications issues differ from those in wired environments because the wireless communications medium has variable and unpredictable characteristics, and the signal strength and propagation fluctuate with respect to time and environment. We provide an overview of group communications issues such as protocol design, state

Prasant Mohapatra; Chao Gui; Jian Li

2004-01-01

116

Communication in industrial research laboratories  

NASA Astrophysics Data System (ADS)

Industrial physicists publish their research results in internal company reports as well as in physics journals. In internal reports, research findings are communicated primarily to engineering and management groups. Because of the specific needs and preferences of these groups, the criteria for internal reports are different from those usually considered best for an ''outside'' publication. For the same reason, oral presentations in a company differ from those for a professional society meeting. The criteria for communications inside and outside a company are compared since physics graduates entering industry must be made aware of these differences-preferably before they graduate.

Jamerson, Frank E.

1982-10-01

117

How does the user interface design of mobile devices influence the social impact of mobile communication?  

Microsoft Academic Search

1. Abstract This paper describes how user interface design of mobile devices interacts with the social impact of mobile communication. Social impact is defined as the influence on relationships between social actors. In the light of mobile communication, one can distinguish among at least three relevant classes of relationships: human-machine relationships, interpersonal relationships between co-located persons, and machine mediated human-human

Stefan Marti

2002-01-01

118

Evolving mobile communication practices of Irish teenagers  

Microsoft Academic Search

Purpose – The purpose of this paper is to examine the social adoption of the mobile phone by Irish teenagers in city, town and rural settings. It aims to investigate two key areas that have influenced the teenagers' social adoption of the mobile phone: first, the influence of locational and socio-economic factors on mobile phone usage; second, how the teenagers'

Anthony Cawley; Deirdre Hynes

2010-01-01

119

Dimensioning of communication links for base-station and MSC interconnection in CDMA mobile communication systems  

Microsoft Academic Search

In CDMA mobile communication systems, voice is encoded and packaged in variable length packets that are transported between the mobile station and the switching center. While the packetization provides great flexibility in resource allocation, it poses a QOS challenge on voice. We discuss link dimensioning for a typical CDMA system. We consider a communication link connecting a CDMA base-station and

Khaled M. F. Elsayed

1997-01-01

120

Land Mobile Communications Satellite Missions (LAMOCOSAMIS) Task 2: Functional Requirements.  

National Technical Information Service (NTIS)

Existing, planned, and foreseeable land mobile communication services in Europe were reviewed. Functional characteristics of available and new services were studied. Assumptions on global architecture were made. Regulatory aspects were investigated. The s...

1985-01-01

121

Randomness evaluation of stream cipher for secure mobile communication  

Microsoft Academic Search

Information Security over mobile communication networks is important for secure communication. In GSM mobile standard, A5\\/1 stream cipher is used to provide security over-the-air voice transmissions. It is strong encryption algorithm among the cryptographic algorithms used in GSM. However, it is cryptanalized by a number of attacks. Recent studies show that it has serious security weaknesses in its architecture. In

Musheer Ahmad; I. Izharuddin

2010-01-01

122

Wireless infrared communications with edge position modulation for mobile devices  

Microsoft Academic Search

Driven by the Infrared Data Association, wireless infrared communication has become a very popular and widely used method for short-range data transmission between mobile devices like laptops, PDAs, and mobile phones. Especially in ad hoc connection applications, IrDA excels over radio-based solutions like Bluetooth or cable-based solutions like USB, due to the point-and-shoot characteristic of infrared communication. The quality and

T. Luftner; C. Kropl; R. Hagelauer; M. Huemer; R. Weigel; J. Hausner

2003-01-01

123

Physiological Measurement in Communication Research.  

ERIC Educational Resources Information Center

|The importance of effective communication compels investigators to seek new ways of measuring physiological responses and to practice the science of psychophysiology. The main objective of psychophysiological research is to describe the systems in organisms which transfer information between the subsystems of soma and psyche. Results should lead…

Behnke, Ralph R.

1970-01-01

124

Integration of IP mobility and security for secure wireless communications  

Microsoft Academic Search

We present alternatives for the integration of Mobile Internet Protocol (Mobile IP) versions with IP Security (IPSec) to secure IP communications over the wireless link. We focus on network layer security and provisioning of security services while roaming to a foreign network, without having to trust the foreign network. Additionally, such a scheme does not require the correspondent host (CH)

Melbourne Barton; Derek Atkins; John Lee; Sanjai Narain; Deidra Ritcherson; Kemal E. Tepe; K. Daniel Wong

2002-01-01

125

IMPROVING SPEECH SECURITY AND AUTHENTICATION IN MOBILE COMMUNICATIONS  

Microsoft Academic Search

This paper points out certain weaknesses in the existing security system of Global System of Mobile Communications (GSM) and proposes a better security system for GSM. The proposed security system provides an authenticated session key distribution protocol between the authentication center (AUC) and the mobile station (MS) for every call attempt made by a MS. At the end of an

Chenthurvasan Duraiappan; Yuliang Zheng

126

Why young consumers are not open to mobile marketing communication  

Microsoft Academic Search

This paper explores young people's motivations for using mobile phones. Older adoles- cents' everyday use of traditional and new forms of mediated communication were explored in the context of their everyday lives, with data generated from self-completion questionnaires, diaries and mini focus groups. The findings confirm the universal appeal of mobile phones to a youth audience. Social and entertainment-related motivations

Ian Grant

2007-01-01

127

Security analysis on a conference scheme for mobile communications  

Microsoft Academic Search

The conference key distribution scheme (CKDS) enables three or more parties to derive a common conference key to protect the conversation content in their conference. Designing a conference key distribution scheme for mobile communications is a difficult task because wireless networks are more susceptible to attacks and mobile devices usually obtain low power and limited computing capability. In this paper

Zhiguo Wan; Feng Bao; Robert Huijie DENG; Akkihebbal L. Ananda

2006-01-01

128

Comparison of upgrade techniques for mobile communication systems  

Microsoft Academic Search

For current mobile communication systems, two limitations exist which restrict their capacity and range of application. They can be characterised as an equipment limit which is determined by the maximum number of mobile stations that can be supported by a base station with given equipment, and an interference limit, which corresponds to a maximum number of carriers that can be

Michael Tangemann; Rupert Rheinschmitt

1994-01-01

129

Communicating on the Move: Mobile Ad-Hoc Networks.  

National Technical Information Service (NTIS)

Mobile Ad-Hoc Networks (MANETs) are wireless networks that continually re-organize themselves in response to their environment without the benefit of a pre-existing infrastructure. A MANET consists of a set of mobile participants who must communicate, col...

D. Nathans R. F. Dillingham

2007-01-01

130

Influence of new mobile tools on communication  

Microsoft Academic Search

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

Saori Murata; Fujio Toriumi; Kenichiro Ishii

131

Usability of a mobile, group communication prototype while rendezvousing  

Microsoft Academic Search

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

Jeff Axup; Stephen Viller; Nicola J Bidwell

2005-01-01

132

Impact of Java Compressed Heap on Mobile\\/Wireless Communication  

Microsoft Academic Search

M-commerce has shown up as e-commerce in mo-bile and wireless communication, and now deals with on-line banking, stock trading, auctions, transactions, and mobile media. M-commerce applications are im-plemented with, for example, Java technology that sup-ports a client-and-server model and cross-platform mo-bile applications. They are attractive, but, need a large heap space, which may slow down the execution, lead to poor

Mayumi Kato; Chia-tien Dan Lo

2005-01-01

133

Surge current distributions in base station of mobile communication system  

Microsoft Academic Search

The paper presents selected results of on-site meas- urements of surge currents in a typical base station for mobile communication. The station consists of a communication tower and a small container with electronic equipment. The aim of these in- vestigations was to determine surge current distributions in con- ducting parts of the tower structure and the equipotential bonding configurations during

Renata Markowska

2003-01-01

134

An Underwater Sensor Network with Dual Communications, Sensing, and Mobility  

Microsoft Academic Search

This paper describes an underwater sensor network with dual communication and support for sensing and mobility. The nodes in the system are connected acoustically for broadcast communication using an acoustic modem we developed. The nodes are connected optically for higher speed point to point data transfers using an optical modem we developed. We describe the hardware details of the underwater

Carrick Detweiller; Iuliu Vasilescu; Daniela Rus

2007-01-01

135

Mobile Robot Communication Without the Drawbacks of Wireless Networking  

Microsoft Academic Search

The default solution for mobile robot communication is RF- networking, typically based on one of the IEEE 802.11 standards also known as WLAN technology. Radio communication frees the robots from umbilical cords. But it suers from several significant drawbacks, espe- cially limited bandwidth and range. The limitations of both aspects are in addition hard to predict as they are strongly

Andreas Birk; Cosmin Condea

2005-01-01

136

Experimental advanced mobile satellite communications system in mm-wave and Ka-band using Japan's COMETS  

NASA Astrophysics Data System (ADS)

The Communications Research Laboratory (CRL) has been studying an advanced mobile satellite communications system using millimeter wave and Ka band in the Communications and Broadcasting Engineering Test Satellite (COMETS) project. The project started in 1990 and the satellite will be launched in 1997. Onboard multibeam interconnecting is one of the basic functions to realize onehop connection among mobile and hand held terminals and Very Small Aperture Terminals (VSAT's) in future mobile satellite communications systems. An intermediate frequency (IF) filter bank and regenerative transponder are suitable for this function. The transponder configuration of an advanced mobile communications mission of the COMETS for experiment is shown. High power transmitters of millimeter wave and Ka bands, a 3 by 3 IF filter bank, and Single Channel Per Carrier/Time Division Multiplexing (SCPC/TDM) regenerative modems are the purpose of studying the feasibility of advanced mobile communications systems.

Isobe, S.; Hamamoto, N.; Takeuchi, M.; Ohmori, S.; Yamamoto, M.

1991-10-01

137

Application suggestions for mobile communication device based on location-based directory information  

US Patent & Trademark Office Database

A mobile communication device may include a mobile communication system configured to facilitate wireless mobile communications. A location sensing system may be configured to sense the location of the mobile communication device. A location-based points of interest application may be configured to locate points of interest within the vicinity of the mobile communication device based on the location of the mobile communication device. An application mapping application may be configured to locate user applications that are relevant to the points of interest within the vicinity of the mobile communication device. A user interface may be configured to present links to the user applications.

Moon; Hannah Youngsil (Boston, MA); Morley; Dorothy Beau (Wakefield, MA); Dobroth; Kathryn Mary (Jamaica Plain, MA)

2013-10-15

138

Nationwide mobile communication systems, volume 1, chapters 1 thru 4  

NASA Astrophysics Data System (ADS)

This thesis provides a basic understanding of nationwide terrestrial and satellite mobile communications and tracking technologies. Covered are systems currently available and in development. An analysis of user costs is performed for comparison. A more detailed satellite cost/benefit analysis for use by the trucking industry is also presented. Follow-on chapters contain discussions of the basic economic issues faces by satellite system operators and the regulatory history of mobile satellite services. Contained in the appendices are a more detailed discussion of mobile satellite systems and a layman's explanation of communication and navigation technologies. The conclusion presents comments on the possible future direction of these new mobile communication services and makes recommendations for trucking industry use.

Schworer, William Joseph, III

1990-06-01

139

Technical comparison of several global mobile satellite communications systems  

NASA Astrophysics Data System (ADS)

The era of satellite-based mobile satellite communications (MSC) systems started with the first MARISAT satellite which was launched into a geostationary orbit over the Pacific Ocean in 1976 to provide communications between ships and shore stations. The combination of high cost and unacceptably large equipment has kept the space-based MSC systems from appealing to the wider market of personal mobile communications. The progress made over the last ten years, however, in digital voice processing, satellite technology, and component miniaturization has resulted in the viability of satellite-based mobile satellite communications systems to meet the growing market in personal mobile communications using handsets similar to those currently in use with land-based cellular systems. Three of the more mature LEO/MEO satellite systems are addressed in this paper including GLOBALSTAR, Iridium, and Odyssey. The system architectures of each system are presented along with a description of the satellite and user handset designs and the multiaccess techniques employed. It will be shown that, although a number of similarities exist among the system addressed, each system is unique in a variety of significant design areas. It is concluded that the technical feasibility of satellite-based mobile satellite communications systems seems to be secure. It will be challenging, however, for the vendors to actually develop and deploy these systems in a cost effective, timely, and reliable way that meets a continually evolving set of requirements based upon a rapidly changing technology base.

Comparetto, Gary M.

140

Case Study in Mobile Internet Innovation: Does Advertising or Acquaintances Communication Decide Taiwan's Mobile Internet Diffusion?  

Microsoft Academic Search

Reporting the world's highest mobile phone penetration rate in 2002, Taiwan's experience in promoting mobile phone has offered global scholars a successful example in innovation marketing. Its current mobile Internet status is therefore received great attentions from international practitioners and researchers. However, despite various marketing efforts, Taiwan's mobile Internet services' diffusion is surprisingly slower than that of Korea and Japan.

Hui-chih Wang; Yi-cheng Ku; Her-sen Doong

2007-01-01

141

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

NASA Astrophysics Data System (ADS)

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

1985-12-01

142

Modeling and Optimization of Zone-Based Registration for Mobile Communication Network  

Microsoft Academic Search

An efficient mobility management for mobile stations plays an important role in mobile communication networks. Two basic operations of mobility management are location registration and paging. A zone-based registration (ZBR) is implemented in most of the mobile communication networks and we consider the mobility management scheme that combines a zone-based registration and a selective paging (SP). We propose a new

JANG-HYUN BAEK; KYUNG-HEE KIM; Douglas C. Sicker

2007-01-01

143

FOREST OPERATIONS MANAGEMENT: TOWARDS MOBILE COMMUNICATION  

Microsoft Academic Search

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

Esko Mikkonen

144

Electromagnetic compatibility problems in mobile communication systems  

Microsoft Academic Search

Summary form only given, as follows. Personal wireless communication services are considered as a subset technology of the information age. They have gained importance and visibility over the 1990s, and future technological advancements in this field will be unprecedented. As the thrust into wireless personal communication continues with more advanced and compact technologies the risks increase of \\

D. C. Pande

1999-01-01

145

Mobile communications and the federal telecommunications system  

Microsoft Academic Search

The first major radio program of the Federal Telecommunications System has been the installation of an extended-coverage VHF Mobile Telephone System for evaluation of the common-user concept of reducing the number of frequencies required by several users by time-sharing. Subscribers are provided three-channel full-duplex dial-up service, with such features as direct dialing of any other mobile, as well as any

R. B. Conrad

1959-01-01

146

A group communication approach for mobile computing  

Microsoft Academic Search

Describes the design and implementation of a set of tools, called MobileChannel, for use with the Isis system. A simple scheme to support user mobility-switching a control point between replicated servers-provides a uniform mechanism to handle both client migrations and server failures. The hands-off mechanism is simplified by integrating a FIFO channel implementation into the server replication mechanism. Our scheme

K. Cho; K. P. Birmans

1994-01-01

147

Communicating Mobile Nano-Machines and Their Computational Power  

NASA Astrophysics Data System (ADS)

A computational model of molecularly communicating mobile nanomachines is defined. Nanomachines are modeled by a variant of finite-state automata—so-called timed probabilistic automata—augmented by a severely restricted communication mechanism capturing the main features of molecular communication. We show that for molecular communication among such motile machines an asynchronous stochastic protocol originally designed for wireless (radio) communication in so-called amorphous computers with static computational units can also be used. We design an algorithm that using the previous protocol, randomness and timing delays selects with a high probability a leader from among sets of anonymous candidates. This enables a probabilistic simulation of one of the simplest known model of a programmable computer—so-called counter automaton—proving that networks of mobile nanomachines possess universal computing power.

Wiedermann, Ji?í; Petr?, Lukáš

148

Overview of NASA Glenn Aero/Mobile Communication Demonstrations.  

National Technical Information Service (NTIS)

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 techn...

D. Brooks D. Hoder R. Wilkins

2004-01-01

149

Overview of NASA Glenn Aero/Mobile Communications Demonstrations.  

National Technical Information Service (NTIS)

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 techn...

D. Brooks D. Hoder R. Wilkins

2004-01-01

150

Mobile satellite communications in the 1990's  

NASA Astrophysics Data System (ADS)

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

Singh, Jai

1992-07-01

151

Technical Communication Research: From Traditional to Virtual.  

ERIC Educational Resources Information Center

|States that researchers in technical communication have begun to take advantage of the interactions taking place via computer-mediated communication as a rich source of research. Reviews three forms of technical communication research methods (ethnography, rhetorical analysis, surveys) and raises preliminary issues to consider when using such…

Gurak, Laura J.; Silker, Christine M.

1997-01-01

152

Multicast Algorithms for Mobile Satellite Communication Networks.  

National Technical Information Service (NTIS)

With the rise of mobile computing and an increasing need for ubiquitous high speed data connections, Internet-in-the-sky solutions are becoming increasingly viable. To reduce the network overhead of one-to-many transmissions, the multicast protocol has be...

R. W. Thomas

2001-01-01

153

Secure Conversation Using Cryptographic Algorithms in 3G Mobile Communication  

Microsoft Academic Search

\\u000a Cryptographic algorithms used by Mobile Subscribers to protect the privacy of their cellular voice and data communication.\\u000a Mobile network is the shared media. When media are shared, privacy and authentication are lost unless some method is established\\u000a to regain it. Ciphering provides the mean to regain control over privacy and authentication. A5\\/x are the encryption algorithms\\u000a used in order to

Alpesh R. Sankaliya; V. Mishra; Abhilash Mandloi

154

On smart base-station antennas for mobile communications  

Microsoft Academic Search

Conventional base-station sector antennas for mobile communications are relatively inexpensive, but do not give an effective protection against interference. An alternative approach is to use directional adaptive phased arrays, which could additionally provide an increased protection against multipath fading and an ability to match antenna radiation to local conditions. For a narrow-band mobile system, we believe that a DSP-based phased

T. B. Vu; G. Jonas

1996-01-01

155

Downlink beamforming for spatially distributed sources in cellular mobile communications  

Microsoft Academic Search

This paper presents a new technique for downlink transmission beamformer design in cellular mobile communication systems using antenna arrays at the base station. The method is based on estimation of an underlying spatial distribution associated with each source’s spatial downlink channel. The algorithm is ‘blind’ in the sense that it depends only on uplink spatial channel statistics, requiring no mobile-to-base

J. M. Goldberg; J. R. Fonollosa

1998-01-01

156

Evolving perspectives of 4th generation mobile communication systems  

Microsoft Academic Search

The last decade of the 20th century has been witness to remarkable technological developments in the area of wireless communication technologies. Following the commercial deployment-and subsequent worldwide success-of 2nd generation mobile telecommunication systems, such as GSM, standardization bodies, industry partners and regulatory fora from around the globe joined forces in producing the standards for 3rd generation mobile telecommunication systems. In

Vangelis Gazis; Nikos Houssos; Anastasia Alnnistiotil; Lazaros Merakos

2002-01-01

157

Multihop Mobile Communications System Adopting Fixed Relay Stations and its Time Slot Allocation Schemes  

Microsoft Academic Search

In this paper, we present a multihop mobile communications system utilizing fixed relay stations to enhance the coverage of the service area. A multihop mobile communications system was originally proposed as a system in which only mobile stations relay communication between other mobile stations and a base station to solve the problem of poor coverage expected in a future cellular

Takeo Ohseki; Naoki Fuke; Hiroyasu Ishikawa; Yoshio Takeuchi

2006-01-01

158

Integrating Communication, Computer Access, Environmental Control & Mobility.  

ERIC Educational Resources Information Center

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

Romich, Barry A.; Vagnini, Carol B.

159

Implementation of a land mobile terminal for satellite data communication  

NASA Astrophysics Data System (ADS)

A prototype for a Land Mobile Terminal (LMT) to perform in-field experimentation and validation activities on the mobile - satellite - shore station link, and to confirm the validity of the proposed LMT implementation was developed for PRODAT. The PRODAT LMT will be a two way system for demonstrating a data only communication at low data rate between land mobile users and a network managing system using the MARECS-A satellite and future dedicated satellites. The terminal consists of the antenna, plus an RF box, below roof equipment, and user interface.

Valsasina, G. B.

1986-09-01

160

Design of mobile shelters for communication purposes  

NASA Astrophysics Data System (ADS)

A general design for a future generation of shelters, to be used as mobile work places, is presented. Design criteria involve ergonomics, functional suitability, and air conditioning. Electronics, power supply, and personnel get their own compartments. Work space is provided for two people with room for two more. Center of mass and cable connections are considered. Air conditioning requirements are calculated with a computer program. The result is an integrated design, applicable to shelters for several purposes.

Lotens, W. A.; Leebeek, H. J.

1982-03-01

161

Beijing Calling... Mobile Communication in Contemporary China  

Microsoft Academic Search

Subsequently, with the recent wave of industrialization, China has become the “factory” of the globalized world. The modernization\\u000a of this country, however, is not confined to the provision of production at a low added value: It also entails technological\\u000a appropriation and innovation. In particular, China represents the biggest world market for mobile phones and will soon dominate\\u000a the Internet market.

Leopoldina Fortunati; Anna Maria Manganelli; Pui-lam Law; Shanhua Yang

2008-01-01

162

Characteristics of scale models of large deployable mesh reflector antenna for mobile communications satellites  

NASA Astrophysics Data System (ADS)

In the land mobile satellite system (LMSS) using a geostationary platform (GPF), a 30 m diameter satellite antenna is desirable for small portable terminal communications. SCR has adopted two deployment types of antenna structure, the Hexa-Link Truss reflector and the Tetra-Triagonal Prism Truss (TETRUS) reflector, and has developed scale models of them. Both of them represent important aspects of large satellite antenna technology. This paper describes the SCR outline of a land mobile satellite communications system and the experimental results of the scale models. This research establishes the basic technical information necessary for the development of a 30 m diameter antenna and a conceptual GPF design.

Akaishi, Akira; Orikasa, Teruaki; Kashiki, Kanshiro; Okamoto, Teruki; Otsu, Yuichi; Satoh, Hideo

1993-10-01

163

Characteristics of scale models of large deployable mesh reflector antennas for mobile communications satellites  

NASA Astrophysics Data System (ADS)

In the land mobile satellite system (LMSS) using a geostationary platform (GPF), a 30 m diameter satellite antenna is desirable for small portable terminal communications. SCR has adopted two deployment types of antenna structure, the Hexa-Link Truss reflector and the Tetra-Triagonal Prism Truss (TETRUS) reflector, and has developed scale models of them. Both of them represent important aspects of large satellite antenna technology. This paper describes the SCR outline of a land mobile satellite communications system and the experimental results of the scale models. This research establishes the basic technical information necessary for the development of a 30 m diameter antenna and a conceptual GPF design.

Akaishi, Akira; Orikasa, Teruaki; Kashiki, Kanshiro; Okamoto, Teruki; Otsu, Yuichi; Satoh, Hideo

164

The Impact of Mobile Data Terminal (MDT) Information Technology on Communication and Recordkeeping in Patrol Work  

Microsoft Academic Search

The impact of mobile data terminal (MDT) information technology is examined through field research which focuses upon the in-situ uses of the MDT by patrol officers. The impact on patrol officers is reflected in increased proactive work (i.e., traffic) and investigative work not typically the province of patrol, changes in communication patterns between line officers and dispatch and authority relationships

Albert J. Meehan

1998-01-01

165

Private foundation funding of applied communication research  

Microsoft Academic Search

Communication researchers increasingly have a primed and attentive audience in private foundations. Yet most foundations are quite dissimilar to the types of organizations that we as communication scholars know and understand. Here we discuss private foundation funding for applied communication research, including how funding priorities are set, and how potential grantees may position themselves for foundation funds. In doing so,

James Dearing; Sam Larson

2002-01-01

166

Open Innovation in Mobile and Convergent Communications  

Microsoft Academic Search

The concept of open innovation seems to be very well suited to information and communication technologies. In the first place,\\u000a as in any other field, the complexity of the new technology makes it necessary for companies to use ideas, processes and inventions\\u000a from other players. As in any other field, we need the collaboration of the university, of SMEs, of

José Jiménez

2008-01-01

167

Huggy Pajama: a mobile parent and child hugging communication system  

Microsoft Academic Search

Huggy Pajama is a novel wearable system aimed at promoting physical interaction in remote communication between parent and child. This system enables parents and children to hug one another through a novel hugging interface device and a wearable, hug reproducing pajama connected through the Internet. The hugging device is a small, mobile doll with an embedded pressure sensing circuit that

James Keng Soon Teh; Adrian David Cheok; Roshan Lalintha Peiris; Yongsoon Choi; Vuong Thuong; Sha Lai

2008-01-01

168

Neurological effects of microwave exposure related to mobile communication  

Microsoft Academic Search

Due to the wide and growing use of mobile communication, there is increasing concern about the interactions of electromagnetic radiation with the human organism, and, in particular, with the brain. In the present report, experimental studies on putative electrophysiological, biochemical and morphological effects of continuous or pulsed microwave radiation are briefly reviewed. Such effects have been described in vitro and

Dirk Matthias Hermann; Konstantin-Alexander Hossmann

1997-01-01

169

Secure Mobile Communication Using Low Bit-Rate Coding Method  

Microsoft Academic Search

Mobile telecommunications such as GSM are now well established globally and users rely heavily on convenient communications it provides. The level of security provided by GSM is superior to its predecessors and is more than adequate for majority of users. However some users in the area of government, defense or business require additional security over and above that provided by

Mohammed Wasif; Chirag R Sanghavi; Mamoon Elahi

2007-01-01

170

Superconducting air interface for mobile communications base stations  

Microsoft Academic Search

An overview of the receive side of the air interface to a mobile communications base station using superconducting components is given. The system is designed for a DCS 1800 base station. The superconducting receive filter and duplexer are described together with comments on the encapsulation and cooler

M. J. Lancaster; J.-S. Hong; D. Jedamzik; R. B. Greed

1998-01-01

171

Base-Station Antenna Arrays in Mobile Communications  

Microsoft Academic Search

This paper describes the utilization of antenna arrays at the basestations of mobile communication systems. Multiple antennas can providea processing gain to increase the base station range and improvecoverage. Also, by exploiting the angular selectivity of an antenna arrayat the base stations of a wireless system, users may be spatiallymultiplexed to increase system capacity. We address several aspectsof the reception

Björn Ottersten; Per Zetterberg

1995-01-01

172

Design of triplexer combiners for base stations of mobile communications  

Microsoft Academic Search

This work presents a design technique for a class of combining networks used in base stations for mobile communications; the considered network is a triplexer composed by three high selectivity filters presenting arbitrary transmission zeros (both complex and pure imaginary), which are connected at the input port through a suitable 4-port junction. A technique for the design of this combining

Giuseppe Macchiarella; Stefano Tamiazzo

2010-01-01

173

On antennas of base-station for mobile communications  

Microsoft Academic Search

With retrospect to the development trace of antenna of base-station for mobile communications, some inappropriate concepts are indicated for discrimination or correction, including the pattern synthesis, feeding of multi-penal antenna, polarization and anti-fading. Their actualized techniques are briefly pointed out.

Wen-Xun Zhang

2009-01-01

174

Design and realization of base station antenna for mobile communication  

Microsoft Academic Search

In this paper, we design and realize a type of dual-polarization base station antenna on the basis of an L-strip patch antenna for mobile communication. To improve the polarization isolation of the antenna, a novel scheme is proposed which uses the two adjacent units to counteract the coupled components. In order to allow the antenna's vertical pattern to accord with

Wang Chunhua; Lin Deyun; Shi Changsheng

2002-01-01

175

The SDMA\\/TDD base station for PHS mobile communication  

Microsoft Academic Search

Space division multiple access (SDMA) is a multiple access scheme for mobile communications that improves system capacity. We developed the SDMA base station (BS) and carried out several tests. We describe the configuration of the SDMA BS and the results of the tests. The result of the indoor measurement indicates that the SDMA BS has sufficient interference suppression performance. The

Yoshiharu Doi; T. Ito; Jun Kitakado; Takeo Miyata; Seigo Nakao; Takeo Ohgane; Y. Ogawa

2002-01-01

176

Performance of CDMA\\/OFDM for mobile communication system  

Microsoft Academic Search

The OFDM technique is an interesting approach in mobile communications in order to achieve a high spectral efficiency and to combat the frequency selectivity of the channel. Another interesting technique is a CDMA system with Rake-receiver. The main advantages of CDMA are well known, but its capacity is limited by multiuser interference. The aim of this study is to combine

K. Fazel

1993-01-01

177

Application of radio-over-fiber (ROF) in mobile communication  

Microsoft Academic Search

Future generation of mobile communication system must be capable of serving high quality and broadband services even in highly dense populated area. The radio-over-fibre is one of the promising systems which can be used along the emerging wireless technologies such as smart antenna or multiple input multiple output (MIMO) systems to meet these requirements. In this paper, the role of

Reza Abdolee; Razali Ngah; Vida Vakilian; Tharek A. Rahman

2007-01-01

178

A low-power wireless mobile communications system  

Microsoft Academic Search

The paper describes a wireless mobile communication system which employs a high gain electronically steered array antenna connected to a radio receiver at a base station. By using a steerable, narrow beamwidth, high gain antenna pattern, the receiver can detect much weaker signals than receivers connected to conventional fixed pattern antennas. Since this system can detect weaker signals, either the

Steven A. Harbin; B. Keith Rainer

1994-01-01

179

On a Model for Radio Propagation in Land Mobile Communication  

Microsoft Academic Search

This article describes a study on a model for radio propagation in a land mobile communication (LMC), which differs from models based on the well-known theory for tropospheric propagation. The new propagation model has been constructed from a phenomenological paint of view for an LMC in an area where artificial or natural obstacles are present. This new model is based

Toshihiro Terada

1995-01-01

180

Risk perception of mobile communication: a mental models approach  

Microsoft Academic Search

Some lay people confronted with a new base station project fear serious health consequences from the high?frequency radiation, while experts consider exposure under the current international standards as unproblematic. These conflictive estimations may be attributed to the different mental models of lay people and experts. Less is known about lay people’s knowledge in regard to mobile communication and their intuitive

Michael Siegrist

2010-01-01

181

Distributed real-equipment testing for the mobile communications services  

Microsoft Academic Search

The test activities performed during the life cycle of the telecommunication service development ensure the service quality and stability so necessary to achieve the maximum availability and reliability. The paper presents authors' contribution to remote and distributed testing for mobile communications services based on cloud computing assets and paradigms. The access solutions to the test methods were implemented for the

Virgil Cazacu; Laura Iuga; Titus Balan; Florin Sandu

2011-01-01

182

A Constructivist Simulation-Based Methodology for Teaching Mobile Communications  

Microsoft Academic Search

A constructivist simulation-based methodology for teaching mobile communication systems in the electrical engineering curriculum is reported. In this methodology, senior undergraduate students develop simulators under the guidance of an advisor, and the simulators are later used by other students to learn these particular technologies. Evaluations based on students' results and opinions demonstrate the effectiveness of the methodology for improving the

Gustavo Vejarano; Fabio G. Guerrero

2008-01-01

183

Generic Conversion of Communication Media for Supporting Personal Mobility  

Microsoft Academic Search

The Intelligent Personal Communication Support System is intro- duced as an application for multiple media conversion tools, embedded in a con- text of personal mobility, service personalization and service interoperability support. After discussing models for conversion in theory, the current conversion technology is evaluated. The necessity of an integrated framework of flexible converters and a generic converter model are derived

Tom Pfeifer; Radu Popescu-zeletin

1996-01-01

184

Authentication of mobile users in personal communication system  

Microsoft Academic Search

The logical structure of a personal communication system (PCS) is divided into three layers: intelligent layer, transmission layer and access layer. The authentication of mobile users is realized in the intelligent layer. The database structure of the PCS, different from the existing systems such as GSM and IS-41 etc., is centralized. Therefore the authentication schemes used in existing systems cannot

Liu Jianwei; Wang Yumin

1996-01-01

185

Enabling rich mobile applications: joint computation and communication scheduling  

Microsoft Academic Search

With the universal adoption of mobile communication devices for many common computing applications like email and web access, there is a growing demand to use these devices for richer applications that require high computing power. This paper looks at a way of enabling thin wireless clients to support powerful applications by using processing and networking infrastructure that are available in

Shoubhik Mukhopadhyay; Curt Schurgers; Sujit Dey

2009-01-01

186

Mobility-based communication in wireless sensor networks  

Microsoft Academic Search

Wireless sensor networks are proposed to deliver in situ observations at low cost over long periods of time. Among numerous challenges faced while designing WSNs and protocols, maintaining connectivity and maximizing the network lifetime stand out as critical considerations. Mobile platforms equipped with communication devices can be leveraged to overcome these two problems. In this article existing proposals that use

Eylem Ekici; Yaoyao Gu; Doruk Bozdag

2006-01-01

187

Mobile Visual Communication Photo Messages and Camera Phone Photography  

Microsoft Academic Search

In this article I will elucidate the concept of photo messaging, and examine camera phones in the context of communication and photography. Camera functions are nowadays a popular add-on to the mobile (cellular) phone. Users can send photographs directly from the phone as photo messages. Findings suggest that the ubiquitous camera phone, and photo messaging, may substantially change the ways

MIKKO VILLI

188

Mobile peer-to-peer frequency-hopping communications  

Microsoft Academic Search

The potential performance of mobile peer-to-peer frequency-hopping communication systems in multiple-access networks is studied. Through analysis and simulation, the effects of Rayleigh fading, shadowing, spectral splatter, the number of frequency channels, spatial diversity, and thermal noise are examined

Don Torrieri

1998-01-01

189

Game Theory and Communication Process Research.  

ERIC Educational Resources Information Center

|Following a brief review of the terminology, important research, and distinguishing characteristics of game theory, four potential benefits of a game theoretic approach to communication research are proposed; game simulations facilitate communication process research; a game matrix enables the researcher to simulate situations in which…

Seibold, David R.; Steinfatt, Thomas M.

190

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

191

Circadian pattern and burstiness in mobile phone communication  

NASA Astrophysics Data System (ADS)

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

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

2012-01-01

192

Research on UV scattering communication  

NASA Astrophysics Data System (ADS)

Ultraviolet (UV) scattering communication is a broadcast communication mode of information transmission by particles in the atmosphere scattering effect on the blind band ultraviolet light, there are many advantages such as unaffected by electromagnetic radiation, good confidentiality, non-line-of sight communication. This type communication mainly used in a short distance, secure communication, which was superior to no line communication in aspect of anti-jamming and secrecy. Firstly the military requirement of UV scattering communication is analyzed in this paper, The development trend is introduced, then the composition and working principle of ultraviolet scattering communication system are also discussed, The key influential factors of UV communication system path transmission loss effects on parameters such as receiver, transmitter and received beam divergence angle, pitch angle and the communication distance were analyzed. Attenuation was quantitatively simulated under different atmospheres, communication patterns and structure parameters. The results show that: transmission distance increases with increasing beam divergence angle and decreasing field angle. And the received view angle of influence on the communication distance is far greater than the emission beam divergence angle; transmission distance increases with increasing beam divergence angle and decreasing field and field angle effects on communication distance is greater than beam divergence angle.

Dong, Ke-yan; Lou, Yan; Ding, Ying; Wang, Shuo; Wang, Hongliang; Jiang, Hui-lin

2013-08-01

193

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

Federal Register 2010, 2011, 2012, 2013

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

2013-06-06

194

FDA Risk Communication Research Agenda  

Center for Biologics Evaluation and Research (CBER)

Text Version... by members of the FDA's internal Communication Council and ... To what degree do medical ... action on different types of communications (eg, recalls ... More results from www.fda.gov/downloads/advisorycommittees/committeesmeetingmaterials

195

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

Microsoft Academic Search

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

Shoichiro Sakata; Tadao Saito; Hiroshi Inose

1984-01-01

196

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

ERIC Educational Resources Information Center

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

Bybee, Carl R.; Cahn, Dudley D.

197

A new mobile communication system using autonomous radio link control with decentralized base stations  

Microsoft Academic Search

A highly advanced and diversified society has been making a significant impact on the increase in the demand for mobile communications. This paper proposes a new concept of a mobile communication system based on the deployment of decentralized autonomous radio link control with decentralized base stations (DCM system: Decentralized Control architecture Mobile communication system). After presenting the service conditions and

T. Hattori; Akio SASAKI; Kohji MOMMA

1987-01-01

198

Remote identification and information processing with a near field communication compatible mobile phone  

Microsoft Academic Search

Mobile phones have become a popular platform for diverse applications in different fields. Near Field Communication (NFC), short range contactless communication standard developed especially for end user devices, is one the most novel technologies integrated into mobile phones. This paper presents a scenario where a Near Field Communication enabled mobile phone is used to identify a construction element, display information

Raine Kelkka; Tommi Kallonen; Jouni Ikonen

2009-01-01

199

Advanced Mobile Communications for Emergency Management and Crisis Response  

Microsoft Academic Search

Reliable communications can be a matter of life-and-death during an emergency or crisis. First responder communication system interoperability, coverage, and flexibility are among the most critical issues evident from events such as the terrorist attacks of September 11 2001, the Indian Ocean Tsunami of 2004, and Hurricane Katrina. Murray State University and research partners are addressing these issues under grants

Michael Bowman

200

Mobile Lorm Glove: introducing a communication device for deaf-blind people  

Microsoft Academic Search

Marginalized communities like deaf-blind people are excluded from several forms of communication. This paper introduces a novel system of interaction to support deafblind people's communication and therefore enhance their independence. We introduce the Mobile Lorm Glove: a mobile communication and translation device for the deafblind. The glove translates the hand-touch alphabet Lorm, a common form of communication used by people

Ulrike Gollner; Tom Bieling; Gesche Joost

2012-01-01

201

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

ERIC Educational Resources Information Center

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

Waldeck, Jennifer H.

2008-01-01

202

Energy conservation in access protocols for mobile computing and communication  

Microsoft Academic Search

Accelerating consumer interest and mushrooming applications for portable networked devices are driving the demand for the optimization of their functions and components. Porta-bility also necessitates reliance on small, self-contained and therefore limited-life power sources such as batteries, making power-management critical to a successful and wide-spread deployment of these new mobile devices. Meanwhile, commu-nications capabilities are fast becoming standard functions on

I. Chlamtac; C. Petrioli; J. Redi

1998-01-01

203

On the base stations antenna system design for mobile communications  

Microsoft Academic Search

The design of a base station antenna for mobile communications is presented. The orthogonal method (OM) is applied under constraints\\u000a on nulls of the radiation pattern. In the synthesis process the mutual coupling between the elements of the antenna array\\u000a could be taken into account. Beam tilting and direction of arrival are also considered. The whole design is completed by

George S. Miaris; Eleftheria Siachalou; Theodoros Samaras; Sotirios K. Goudos; Elias Vafiadis; Stavros Panas

2006-01-01

204

SAW-based IF Processors for mobile communications satellites  

NASA Astrophysics Data System (ADS)

Future generation mobile communications satellite must operate with very limited spectrum allocations and hence require sophisticated on-board processing to provide efficient spectrum management. This paper discusses the use of a complex Surface Acoustic Wave based, IF Processor which will perform the signal processing functions on Inmarsat 3. Comprehensive experimental performance data, obtained from a COM DEV internally funded program has clearly demonstrated the design and implementation to be optimum for the Inmarsat 3 program.

Kovac, Robert; Lee, Mike; Miller, Nigel; Peach, Robert; Swarup, Arvind; van Osch, Brent; Veenstra, Arnold

1991-10-01

205

GPCA Method for Fraud Detection in Mobile Communication Networks  

Microsoft Academic Search

To improve the fraud detection accuracy by SVM(support vector machine), a feature extraction method named GPCA based on IG (information gain) and PCA (principal component analysis) is proposed. It analyzes the data on CDR(call detail record), customer information,paying and arrear information etc in mobile communication networks , and then the data can be used by the classifier SVM to build

WANG Da-zhen

2006-01-01

206

Mobile Communication in the Public Mind: Insights from Free Associations Related to Mobile Phone Base Stations  

Microsoft Academic Search

The number of people using mobile phones has dramatically increased. At the same time, many people are unsettled about the potential health effects from the electromagnetic fields generated by mobile phone base stations. Research indicates that the risks associated with base stations are perceived differently by experts, laypeople, and base station opponents. Using a free association method, we analyzed these

Simone Dohle; Carmen Keller; Michael Siegrist

2012-01-01

207

System, method and article of manufacture for a mobile communication network utilizing a distributed communication network  

US Patent & Trademark Office Database

A system, method, and article of manufacture are provided for obtaining information on a mobile computing environment utilizing a distributed communication network. A pattern template is generated. This pattern template is stored on a thin client computer. A query is then created on the thin client computer based in part on user input. A network is queried for information utilizing a distributed communication network. A response is then received to the query from the distributed communication network. This response is processed utilizing an application tool on the thin client computer. The response is filtered by the application tool based on the pattern template. Information is then displayed to a user.

Gershman; Anatole Vitaly (Chicago, IL); Swaminathan; Kishore Sundaram (Downers Grove, IL); Meyers; James L. (Chicago, IL); Fano; Andrew Ernest (Evanston, IL)

2001-03-06

208

Power resource cooperation control considering wireless QoS for CDMA packet mobile communication systems  

Microsoft Academic Search

With the rapidly increasing demand for high-speed mobile multimedia and the need to support diversified requirements of users by packet communication systems, wireless quality of service (QoS) resource management becomes more and more indispensable, especially for the IMT-2000 system and beyond. In previous researches, QoS controls carried out independently at base stations have been proposed. However, in a CDMA packet

Lan Chen; Hidetoshi Kayama; Narumi Umeda

2002-01-01

209

On the performance of HTS microstrip quasi-elliptic function filters for mobile communications application  

Microsoft Academic Search

The low-loss and high-selective high-temperature superconducting (HTS) bandpass filters can enhance performance of mobile communications systems. In this paper, we summarize a recent progress of novel HTS preselect bandpass filters that have been developed for a European research project. The objective of the project is to construct an HTS-based transceiver for mast-mounted DCS1800 base stations. The HTS preselect receive filters

Jia-Sheng Hong; Michael J. Lancaster; Dieter Jedamzik; Robert B. Greed; Jean-Claude Mage

2000-01-01

210

User profile replication with caching for distributed location management in mobile communication networks  

Microsoft Academic Search

Location management is an essential process in future mobile communication networks. An important issue is an efficient man- agement of the location database. In this paper, the next genera- tion mobile communication network is proposed to be integrated with a TINA-compliant architecture enabled to handle that kind of mobile-specific processes. This paper discusses the design, and its modeling and comparison

Hoang Nguyen Minh; Harmen R. van As

2001-01-01

211

'A New Sense of Place?' Mobile 'Wearable' Information and Communications Technology Devices and the Geographies of Urban Childhood  

Microsoft Academic Search

In this paper we describe a new research initiative, 'A New Sense of Place?', which involves the collaboration of private- and public-sector partners. Its purpose is to explore and develop the interface between children and new mobile 'wearable' computing and communication devices. The research team is particularly interested in how these new technologies might be applied to help children (re-)engage

OWAIN JONES; MORRIS WILLIAMS; CONSTANCE FLEURIOT

2003-01-01

212

Network and protocol architectures of hybrid multimedia mobile access communication system  

Microsoft Academic Search

We present a network architecture of the hybrid multimedia mobile access communication (MMAC) system through which a number of broadband multimedia mobile communication services are provided for hand-held, small radio terminals. In the hybrid MMAC system, the conventional personal communication system (PCS) link is used for uplinks while the broadband radio link under development in the MMAC Promotion Council is

T. Sakamoto; K. Tsunoda; E. Kamagata; M. Serizawa

1999-01-01

213

On the electromagnetic compatibility in construction of microcellular mobile communication networks  

Microsoft Academic Search

The microcellular mobile radio systems are widely utilized in the third generation of digital mobile communication networks, and will certainly be applied in the forthcoming personal communication networks as well. However, we still have no strict definition so far for the so-called “microcell area” in the urban wireless communication environment. Roughly speaking, the microcell implies such a region in which

Zhu Hongbo; Cao Wei

1998-01-01

214

Jitter compensation on the downlink of future mobile multimedia communications systems  

Microsoft Academic Search

Not only is the amount of packet traffic carried on mobile communications networks growing, it is also anticipated that such communication networks will eventually use packet-based backbone and core networks. Considering this, characteristics of packet (IP) traffic such as delay jitter will be of growing significance to the performance of these mobile communications systems. Not only will such characteristics affect

Glenn Platt; Jamil Y. Khan

2003-01-01

215

A Provable-Security Mutual Authenticated Key Agreement Protocol for Mobile Communication  

Microsoft Academic Search

In the area of mobile communication security, a key agreement protocol with mutual authentication is very essential to the following secure sessions between communicators and more attentions are paid to the provability of the protocol security. Based on Blake-Wilson's work, the new notions of secure AK and AKC protocols are defined. An efficient authenticated key agreement protocol for mobile communication

Pan Heng; Li Jing-Feng; Zheng Qiu-Sheng

2008-01-01

216

User requirements for interruption management in mobile communications in hospitals.  

PubMed

In hospitals, mobile communication devices increase the occurrence of inappropriate interruptions during clinical task performance. These interruptions have been related to decreased quality of clinical care. User requirements were elicited using a scenario based approach. The results present insights into user requirements for an interruption management system for hospitals. Hospital workflow protocols were identified as a major source of interruptions. Many suggestions for managing these interruptions related to improving workflow using IT. We have shown that even though the hospital is an exceptionally demanding environment, the user requirements for interruption management concur with earlier findings in the broader fields of context aware interruption management and computer supported cooperative work. PMID:23920869

Talsma, Bernd G; Solvoll, Terje; Hartvigsen, Gunnar

2013-01-01

217

Mass Communication Researchers in Sweden. Swedish Mass Communication Research: Publications in English, French and German.  

National Technical Information Service (NTIS)

This listing of researchers and publications in mass communications research in Sweden is integrated into a single list arranged by the name of the researchers and noting their publications (if any) in the appropriate languages. In addition to publication...

U. Carlsson

1978-01-01

218

Smart Antenna Application in DS-CDMA Mobile Communication System  

NASA Astrophysics Data System (ADS)

This thesis examine the use of an equally-spaced linear adaptive antenna array at the mobile station for a typical Direct Sequence Code Division Multiple Access (DS-CDMA) cellular mobile communications system with forward error correction, with soft decision decoding is studied, We analyze the performance of a randomly positioned mobile terminal with a randomly orientated adaptive antenna array in the forward channel (base- station to mobile) of a multi-cell DS-CDMA system and established four performance% boundaries, Using the more conservative optimized array antenna performance boundary for the 2-, 3- and 4-element linear array, we compare the capacity and the performance% of different cellular systems under a range of shadowing conditions, with and without antenna sectoring at the base-station, and for various user capacities, using Monte Carlo simulation We further apply tapped-delay line (transversal filter) to each antenna element channel, to allow frequency dependent amplitude and phase adjustment for broadband signals, The performance of a DS-CDMA cellular system with a mobile terminal equipped with a linear array and a tapped-delay line is analyzed, It has been demonstrated that the optimization process has been extremely computationally expensive and hence minimum taps should be used for practical consideration, The results illustrated that, in general, for a 2-element linear array system, a 3-tap delay line would be sufficient to equalize the broadband signal while providing a similar performance level to that of a narrow-band adaptive array system In the case of a 3-element linear array system, a 2-tap delay line would suffice.

Ng, Kok K.

2002-09-01

219

Communication networks for autonomous mobile robot computer architectures and distributed real-time computing  

NASA Astrophysics Data System (ADS)

Communication networks play an increasingly important role in many areas of computing. This dissertation introduces an interprocessor communication network for mobile robot computer architectures and real-time communication networks for distributed real-time computing. In both cases, the objective of the research is to provide communication with very low delay. Mobile robot tasks such as collision avoidance and dynamic navigation change over time and exhibit a high degree of cooperation. The segmented bus is a reconfigurable interconnection network for intelligent mobile robot applications. The segmented bus employs a preemptive circuit-switched message transfer technique for low delay. For mobile robot applications, analysis suggests that message delays are lower on the segmented bus as compared to alternatives such as the multiple bus. Interactive real-time message streams are used in continuous media distributed sensing and command/control applications. These streams require low end-to-end delay bounds and zero-loss. This dissertation offers solutions to message-stream admission and low latency message transfers for interactive real-time message streams on communication networks. The proposed adaptive stream admission procedure is shown to admit more streams to a network than previous approaches. The proposed preemphasis cut-through data transfer mechanism reduces the minimum achievable end-to-end delay bound of a packet-switched network to values approaching circuit-switched techniques. To obtain low latencies on integrated broadband networks, the asynchronous transfer mode (ATM) must support bound-delay, zero-loss data transfers. A message-level delay control mechanism based on preemptive cut-through is presented. Hardware and software to implement message-level delay control are described results show a significant reduction in computation requirements when message-level delay control is used on ATM switch processors.

Aras, Caglan Mehmet

1993-12-01

220

An Analysis of Fixed-Mobile Communications Convergence: Development, Social Benefits and Markets  

Microsoft Academic Search

In recent years, global mobile telephony has experienced a spectacular growth never presented in the long history of fixed network based communications. The International Telecommunications Union indicated that, in 2002, the number of mobile subscribers surpassed the number of fixed main lines in service for the first time. This mobile service adoption growth might suppose that the mobile telephone original

Claudio Feijoo; J. L. Gomez-Barroso; Sergio Ramos; D. Rojo

2006-01-01

221

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

ERIC Educational Resources Information Center

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

Ogara, Solomon Omondi

2011-01-01

222

Experimental demonstration of a retro-reflective laser communication link on a mobile platform  

NASA Astrophysics Data System (ADS)

Successful pointing, acquisition, and tracking (PAT) are crucial for the implementation of laser communication links between ground and aerial vehicles. This technology has advantages over the traditional radio frequency communication, thus justifying the research efforts presented in this paper. The authors have been successful in the development of a high precision, agile, digitally controlled two-degree-of-freedom electromechanical system for positioning of optical instruments, cameras, telescopes, and communication lasers. The centerpiece of this system is a robotic manipulator capable of singularity-free operation throughout the full hemisphere range of yaw/pitch motion. The availability of efficient two-degree-of-freedom positioning facilitated the development of an optical platform stabilization system capable of rejecting resident vibrations with the angular and frequency range consistent with those caused by a ground vehicle moving on a rough terrain. This technology is being utilized for the development of a duplex mobile PAT system demonstrator that would provide valuable feedback for the development of practical laser communication systems intended for fleets of moving ground, and possibly aerial, vehicles. In this paper, a tracking system providing optical connectivity between stationary and mobile ground platforms is described. It utilizes mechanical manipulator to perform optical platform stabilization and initial beam positioning, and optical tracking for maintaining the line-of-sight communication. Particular system components and the challenges of their integration are described. The results of field testing of the resultant system under practical conditions are presented.

Nikulin, Vladimir V.; Malowicki, John E.; Khandekar, Rahul M.; Skormin, Victor A.; Legare, David J.

2010-02-01

223

Mutual Authentication for Mobile Communication Using Symmetric and Asymmetric Key Cryptography  

Microsoft Academic Search

\\u000a The Global System for mobile communication (GSM) is widely used for mobile communication where the mobile users can make and\\u000a receive call when they are moving independent of time, location, and network access. The wireless mobile systems are more\\u000a vulnerable to deceitful access and eaves dropping. Though the authentication process on GSM is giving a reasonable security\\u000a level but have

Tumpa Roy; Kamlesh Dutta

224

A review of earth observation using mobile personal communication devices  

NASA Astrophysics Data System (ADS)

Earth observation using mobile personal communication devices (MPCDs) is a recent advance with considerable promise for acquiring important and timely measurements. Globally, over 5 billion people have access to mobile phones, with an increasing proportion having access to smartphones with capabilities such as a camera, microphone, global positioning system (GPS), data storage, and networked data transfer. Scientists can view these devices as embedded sensors with the potential to take measurements of the Earth's surface and processes. To advance the state of Earth observation using MPCDs, scientists need to consider terms and concepts, from a broad range of disciplines including citizen science, image analysis, and computer vision. In this paper, as a result of our literature review, we identify a number of considerations for Earth observation using MPCDs such as methods of field collection, collecting measurements over broad areas, errors and biases, data processing, and accessibility of data. Developing effective frameworks for mobile data collection with public participation and strategies for minimizing bias, in combination with advancements in image processing techniques, will offer opportunities to collect Earth sensing data across a range of scales and perspectives, complimenting airborne and spaceborne remote sensing measurements.

Ferster, Colin J.; Coops, Nicholas C.

2013-02-01

225

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

NASA Astrophysics Data System (ADS)

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

1993-08-01

226

77 FR 28797 - Redundancy of Communications Systems: Backup Power Private Land Mobile Radio Services: Selection...  

Federal Register 2010, 2011, 2012, 2013

...Communications Systems: Backup Power Private Land Mobile Radio Services...deletes a rule setting forth backup power requirements for communications...deletes a rule providing that UHF television translators on Channels...such operations. There are no UHF television translators...

2012-05-16

227

Programmatic Research on Communication Barriers to Learning.  

ERIC Educational Resources Information Center

Reports the findings of programmatic research on the perceived seriousness of communication barriers to learning across five pedagogies, which uncovered a generalized ordering of specific concerns as well as dimensionality of learning barriers. Suggests that pedagogical research bound by discipline or university may be more generalizable than…

Golen, Steven; Burns, Alvin C.

1988-01-01

228

Development of a cheap on-board vision mobile robot for robotic soccer research  

Microsoft Academic Search

To promote robotic soccer research, we need a low cost and portable robot with some sensors and a communication device. To date, there is no platform for robotic soccer. Therefore, each research must build his own robots or utilize robots which are commercially available. This paper describes how to construct a robot system which includes a lightweight and low-cost mobile

T. Nakamura; K. Terada; A. Shibata; J. Morimoto; H. Adachi; H. Takeda

1998-01-01

229

Broadband and scalable mobile satellite communication system for future access networks  

NASA Astrophysics Data System (ADS)

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

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

2005-07-01

230

PREMIER PAS OF MOBILE INTERNET BUSINESS: A SURVEY RESEARCH ON MOBILE INTERNET SERVICE  

Microsoft Academic Search

The increase in both cellular phone users and Internet surfers implies the explosive expansion in Mobile Internet business. In spite of the aggressive environment in which launch the full-fledged Mobile Internet services, there is limited research on the basic preferences and expectations of the Mobile Internet users. For this reason, a survey research was designed to find the status quo

Minhee Chae; Youngwan Choi; Hoyoung Kim; Hyoshik Yu; Jinwoo Kim

2000-01-01

231

Smart-antenna systems for mobile communication networks. Part 1. Overview and antenna design  

Microsoft Academic Search

This paper focuses on the interaction and integration of several critical components of a mobile communication network using smart-antenna systems. This wireless network is composed of communicating nodes that are mobile, and its topology is continuously changing. One of the central motivations for this work comes from the observed dependence of the overall network throughput on the design of the

S. Bellofiore; C. A. Balanis; J. Foutz; A. S. Spanias

2002-01-01

232

Design of base station antenna using ACP technology for mobile communication  

Microsoft Academic Search

Mobile communication is in ever expanding demand. To cater for the rapid increase in the number of users, the overall capacity of the service must be increased. A very important component of any mobile communication system is the base station antenna. In this work, a single element patch antenna was designed using the ACP technique, operating at 1.8 GHz, which

A. Sherwal; N. Tran

2001-01-01

233

A Simulation Study for Allocation of Base Stations in Mobile Communication Networks  

Microsoft Academic Search

In actual mobile communication networks, the users' locations, the number of mobile communication users, and their behavior change depending on the time zone. This dependency affects the cell traffic; thus, the allocation of base stations (BSs) in the service area is an important problem to be investigated. In this paper we propose a new model for allocation of BSs in

Takako Yamada; Yukio Takahashi; Leonard Barolli; Norio Shiratori

2001-01-01

234

A Method for Simulating the Random Workload of a Base Station for Mobile Communications  

Microsoft Academic Search

A method is introduced in this paper for computer simulation of the random workload of a base station for mobile communications. The workload of a base station is characterised by state parameters, such as the number of subscribers and number of mobile phones currently in communication with services provided by the base station, etc. For given estimates of the state

Peng Huang; Yunxian Pi; J. Yu

2006-01-01

235

Analysis of propagation path for location of base-station in the microcell CDMA mobile communications  

Microsoft Academic Search

In microcell mobile communication, we analyze the propagation path which can accurately and rapidly interpret mobile communication propagation in an urban environment, when the subscriber service is based on the urban main road. To find the appropriate BS location in an urban street, we suggest a simplified algorithm to interpret the propagation path and a propagation prediction model which can

Sun-Kuk Noh; Chang-Gyun Park

2004-01-01

236

A study of multi-hop mobile communication access models considering elapsed time from coverage area  

Microsoft Academic Search

In this paper, we focus on multi-hop mobile communication. We propose a mobile communication model that able to connect to base-station by using multi-hop, when some nodes are in the outside of the coverage area of basestations. At first, we examine the \\

Yukiko Nasu; Shigeru Shimamoto

2005-01-01

237

Applications of antenna arrays to mobile communications. I. Performance improvement, feasibility, and system considerations  

Microsoft Academic Search

The demand for wireless mobile communications services is growing at an explosive rate, with the anticipation that communication to a mobile device anywhere on the globe at all times will be available in the near future. An array of antennas mounted on vehicles, ships, aircraft, satellites, and base stations is expected to play an important role in fulfilling the increased

LAL C. GODARA

1997-01-01

238

A Picture and a Thousand Words: Visual Scaffolding for Mobile Communication in the Developing World  

Microsoft Academic Search

Mobile communication is a key enabler for economic, social and political change in developing regions of the world. Today's internet-enabled, multimedia, and touch-screen mobile smartphones could become the future platform for delivering information and communication technology (ICT) to these regions. We describe Picture Talk, a smartphone application framework designed to facilitate local information sharing in regions with sparse Internet connectivity,

Robert Farrell; Catalina Danis; Thomas Erickson; Jason Ellis; Jim Christensen; Mark Bailey; Wendy A. Kellogg

2009-01-01

239

Optimum multi-layered cell architecture for personal communication systems with high degree of mobility  

Microsoft Academic Search

The paper presents a multi-layer structure for personal communications services (PCS). An evaluation is shown for low and high mobility of PCS in terms of cost economy, capacity and spectrum usage. It is supposed that the service area with 30 km radius is covered by a multiple micro cells in the low mobility plane, while the high-mobility plane employs macro

Keisuke Ogawa; Takeshi Hattori; Hiroshi Yoshida

1994-01-01

240

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

241

Implications of Mobility: The Uses of Personal Communication Media in Everyday Life  

Microsoft Academic Search

This study examined the impact of mobile communications on interpersonal relation- ships in daily life. Based on a nationwide survey in Japan, landline phone, mobile voice phone, mobile mail (text messaging), and PC e-mail were compared to assess their usage in terms of social network and psychological factors. The results indicated that young, nonfamily-related pairs of friends, living close to

Kenichi Ishii

2006-01-01

242

Towards a Model of Seamless Mobility - User Value and Security in Computing, Content, and Communications  

Microsoft Academic Search

Seamless mobility is a term that encompasses a broad range of technologies and applications. It builds on technology developments in the wireless industry over the last 20 years, starting with mobile telephony, on through mobile IP, convergence of voice and data, and now towards an ever-increasing rate of convergence\\/collision between the worlds of secure communication, content, and computing. It is

Jeena Srinivas; Stephen Chen

2005-01-01

243

Commentary: Narrative Ethnography as Applied Communication Research  

ERIC Educational Resources Information Center

|The breadth and heuristic merits of Harold (Buddy) Goodall's scholarship exemplify the teachings and influence of Gerald Phillips. One nominator applauds Goodall's leadership and dedication to furthering the visibility and utility of applied communication. Goodall's research is also widely used in other fields such as sociology and anthropology,…

Goodall, H. L., Jr.

2004-01-01

244

Multivariate Multiple Regression in Communication Research.  

ERIC Educational Resources Information Center

|This paper examines the multivariate multiple regression model and explores its applicability to communication research. The first section discusses partitioning of a data matrix, as a heuristic device for distinguishing among alternative regression models. Section two examines various aspects of univariate multiple regression, including the form…

Monge, Peter R.

245

Computer networks in communication survey research  

Microsoft Academic Search

The paper explores the feasibility of using computer networks as communication survey research instruments. Also covered are the use of computers and computer networks in survey studies; a listing of the advantages and disadvantages of network surveys as compared with mail, phone, and fax surveys; a description of the development steps of network surveys; and a comparison of differences in

Chien Chou

1997-01-01

246

Mass Communication Researchers in Sweden. Swedish Mass Communication Research: Publications in English, French and German.  

ERIC Educational Resources Information Center

This listing of researchers and publications in mass communications research in Sweden is integrated into a single list arranged by the name of the researchers and noting their publications (if any) in the appropriate languages. In addition to publications, information provided for each researcher includes title and academic degree, project,…

Carlsson, Ulla, Ed.

247

Towards THz Communications - Status in Research, Standardization and Regulation  

NASA Astrophysics Data System (ADS)

In the most recent years, wireless communication networks have been facing a rapidly increasing demand for mobile traffic along with the evolvement of applications that require data rates of several 10s of Gbit/s. In order to enable the transmission of such high data rates, two approaches are possible in principle. The first one is aiming at systems operating with moderate bandwidths at 60 GHz, for example, where 7 GHz spectrum is dedicated to mobile services worldwide. However, in order to reach the targeted date rates, systems with high spectral efficiencies beyond 10 bit/s/Hz have to be developed, which will be very challenging. A second approach adopts moderate spectral efficiencies and requires ultra high bandwidths beyond 20 GHz. Such an amount of unregulated spectrum can be identified only in the THz frequency range, i.e. beyond 300 GHz. Systems operated at those frequencies are referred to as THz communication systems. The technology enabling small integrated transceivers with highly directive, steerable antennas becomes the key challenges at THz frequencies in face of the very high path losses. This paper gives an overview over THz communications, summarizing current research projects, spectrum regulations and ongoing standardization activities.

Kürner, Thomas; Priebe, Sebastian

2013-08-01

248

The Haunting of Communication Research by Dead Metaphors: For Reflexive Analyses of the Communication Research Literature.  

ERIC Educational Resources Information Center

Explicates two closely related metaphors about communication in everyday discourse that lead to a picture of communication as an indeterminate process for sharing subjective meanings. Demonstrates the tacit utilization of these metaphors by the Michigan State tradition of compliance-gaining research through examination of both their theory and…

Nelson, Christian K.

2001-01-01

249

University research reactors and Internet communication  

SciTech Connect

In July 1993, the U.S. Nuclear Regulatory Commission (NRC) stunned nonprofit U.S. universities by eliminating the historical fee exemption for these entities. The fees would have devastating effects on university reactor operations and university by-product material usage. Faced with the prospect of eliminating their programs, the university research reactor (URR) community made a concerted response to reinstate the exemption. While the effort eventually proved successful, the need for fast and efficient communication became very apparent during the crisis. One outcome was an effort to enhance communications among the university reactors by using electronic mail (E-mail) on the Internet. This paper describes how the fee crisis demonstrated the need for enhanced communications and the results of the effort to provide it.

Bobek, L.M.

1994-12-31

250

Performance Analysis of Location-Aware Mobile Service Proxies for Reducing Network Cost in Personal Communication Systems  

Microsoft Academic Search

We propose and analyze mobile service management schemes based on location-aware proxies with the objective to reduce the network signaling and communication cost in future personal communication systems (PCS). Under these schemes, a mobile user uses personal proxies as intelligent client-side agents to communication with services engaged by the mobile user. A personal proxy cooperates with the underlying location management

Baoshan Gu; Ing-ray Chen

2005-01-01

251

International Conference on Satellite Systems for Mobile Communications and Navigation, 4th, London, England, Oct. 17-19, 1988, Proceedings  

NASA Astrophysics Data System (ADS)

Attention is given to the following topics: antennas and propagation, systems for communication, systems for land mobile communications, systems for aeronautical communications, and system economics, operation, and traffic. Particular papers are presented on tracking receiver design for the electronic beam squint tracking system in the maritime mobile environment, network signalling system design considerations in a multiservice mobile satellite communication systems, Inmarsat's aeronautical satellite communication system, and proposed systems configurations for a satellite-based ISDN.

252

Mobile social signal processing: vision and research issues  

Microsoft Academic Search

This paper introduces the First International Workshop on Mobile Social Signal Processing (SSP). The Workshop aims at bringing together the Mobile HCI and Social Signal Processing research communities. The former investigates approaches for effective interaction with mobile and wearable devices, while the latter focuses on modeling, analysis and synthesis of nonverbal behavior in human{human and human-machine interactions. While dealing with

Alessandro Vinciarelli; Roderick Murray-Smith; Hervé Bourlard

2010-01-01

253

The iPad and mobile technology revolution: benefits and challenges for individuals who require augmentative and alternative communication.  

PubMed

The iPad and other mobile technologies provide powerful new tools to potentially enhance communication for individuals with developmental disabilities, acquired neurogenic disorders, and degenerative neurological conditions. These mobile technologies offer a number of potential benefits, including: (a) increased awareness and social acceptance of augmentative and alternative communication (AAC), (b) greater consumer empowerment in accessing AAC solutions, (c) increased adoption of AAC technologies, (d) greater functionality and interconnectivity, and (e) greater diffusion of AAC research and development. However, there remain a number of significant challenges that must be addressed if these benefits are to be fully realized: (a) to ensure the focus is on communication, not just technology, (b) to develop innovative models of AAC service delivery to ensure successful outcomes, (c) to ensure ease of access for all individuals who require AAC, and, (d) to maximize AAC solutions to support a wide variety of communication functions. There is an urgent need for effective collaboration among key stakeholders to support research and development activities, and to ensure the successful implementation of mobile technologies to enhance communication outcomes for individuals who require AAC and their families. PMID:23705813

McNaughton, David; Light, Janice

2013-06-01

254

Capacity anti-interference for simulation and research communication system on diversity technique  

NASA Astrophysics Data System (ADS)

Frequency-hopping communication is an effective technique for anti-interference, which has significant application value and vast development in such fields as military communication, mobile communication, wireless local area network and wireless personal communication. This article demonstrates the influence of several common man-made interferences on frequency-hopping system capacity and stresses the research on anti-interference capacity against some frequency bands. Based on simulation experiment, this article comes up with the improvement for frequency-hopping system in light of frequency diversity technique. The experiment shows that the improved frequency-hopping system's anti-interference capacity against some frequency bands has increased greatly.

Li, Baohong

2013-03-01

255

MODELING OF WIRELESS MOBILE COMMUNICATION SYSTEM USING Z NOTATION  

Microsoft Academic Search

In this paper, we make an effort to model complex and dynamic domain of wireless mobile networks using emerging software engineering practices. Wireless mobile networks enable user to access information and services at any geographic location. The major setback of existing wireless network models is the poor service quality and undesirable user disconnections due to mobility. Formal method is the

Saima Tariq; Nazir Ahmad Zafar

256

Mobile TV Becomes Social - Integrating Content with Communications  

Microsoft Academic Search

Mobile TV is a class of pervasive multimedia services which currently enjoys considerable scientific and commercial attention. In this paper, we propose the integration of peer-to-peer interactivity as one likely Mobile TV evolution path. We integrate findings from related fields to develop a definition of Mobile Social TV and outline its design space in order to discuss opportunities of integrating

Raimund Schatz; Siegfried Wagner; Sebastian Egger; Norbert Jordan

2007-01-01

257

Malaysia and Singapore: International Perspectives on Business Communication Research.  

ERIC Educational Resources Information Center

|Offers an overview of business-communication research in Malaysia and Singapore, discussing its close associations with business-communication teaching, professional organizations, and consulting. Discusses research directions in the region. (SR)|

Tan, Joo-Seng

1998-01-01

258

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

259

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.

260

Distributed Mobile Communication Base Station Diagnosis and Monitoring Using Multi-agents  

Microsoft Academic Search

Most inherently distributed systems require self diagnosis and on-line monitoring.This is especially true in the domains of power transmission and mobile communication.Much effort has been expended in developing on-site monitoring systems for distributed power trans- formers and mobile communication base stations.In this paper, a new approach has been employed to implement the autonomous self diagno- sis and on-site monitoring using

J. Q. Feng; D. P. Buse; Q. H. Wu; J. Fitch

2002-01-01

261

Propagation Path Analysis for Location Selection of Base-Station in the Microcell Mobile Communications  

Microsoft Academic Search

\\u000a In microcell mobile communication using cellular method, we analyze propagation path which can accurately and rapidly interpret\\u000a mobile communication propagation environment in urban, when subscriber service is done based on the main road in urban.  In\\u000a this paper, to appropriate location of BS in urban street, we suggest a simplified algorithm to interpret a propagation path\\u000a and a propagation prediction

Sun-kuk Noh; Dong-you Choi; Chang-kyun Park

2005-01-01

262

A fast algorithm based on MEI and FMM for field prediction in urban mobile communications  

Microsoft Academic Search

To meet the growing demand for high-capacity mobile communication services, micro-cell and pico-cell are now introduced. The prediction of the wave propagation in urban micro- and pico-cells is becoming very important in the design of a mobile communication system. In urban environments with many high buildings, the antenna height at the base station is usually below the level of the

Xiaoxing Yin; Xinyu Zai; Wei Hong; Xiaowei Zhu

1999-01-01

263

On the Correlation and Scattering Functions of the WSSUS Channel for Mobile Communications  

Microsoft Academic Search

The wide-sense stationary-uncorrelated scattering (WSSUS) channel model is a commonly employed model for the multipath channel experienced in mobile communications. The second-order statistics of these channels are described by the delay cross-power density or by its -Fourier transform, the scattering function . This paper presents an analysis of the delay cross-power density and scattering functions for mobile communications channels. We

John S. Sadowsky; Venceslav Kafedziski

1998-01-01

264

On the correlation and scattering functions of the WSSUS channel for mobile communications  

Microsoft Academic Search

The wide-sense stationary-uncorrelated scattering (WSSUS) channel model is a commonly employed model for the multipath channel experienced in mobile communications. The second order statistics of these channels are described by the delay cross-power density ?h(?;?t) or by its ?t-Fourier transform, the scattering function Sh(?;?). This paper presents an analysis of the delay cross-power density and scattering functions for mobile communications

John S. Sadowsky; Venceslav Kafedziski

1998-01-01

265

An Adaptive Compulsory Protocol for Basic Communication in Highly Changing Ad hoc Mobile Networks  

Microsoft Academic Search

In this paper we study the problem of basic communication in ad-hoc mobile networks where the deployment area changes in a highly dynamic way and is unknown. We call such networks highly changing ad-hoc mobile networks. For such networks we investigate an efficient communication protocol which extends the idea (introduced in [4, 6]) of exploiting the co-ordinated motion of a

Ioannis Chatzigiannakis; Sotiris E. Nikoletseas

2002-01-01

266

A Crisis Communication Network Based on Embodied Conversational Agents System with Mobile Services  

Microsoft Academic Search

In this paper, we proposed a new framework to incorporate an intelligent agent software robot into a crisis communication portal (CCNet) in order to send alert news to subscribed users via email and other mobile services such as Short Message Service (SMS), Multimedia Messaging Service (MMS) and General Packet Radio Services (GPRS). The content on the mobile services can be

Ong Sing Goh; Cemal Ardil; Kok Wai Wong; Arnold Depickere

267

Study of LEO-SAT Microwave Link for Broad-Band Mobile Satellite Communication System.  

National Technical Information Service (NTIS)

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 degr...

M. Fujise W. Chujo I. Chiba Y. Furuhama K. Kawabata

1993-01-01

268

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

Microsoft Academic Search

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

Johannes Schoning; Michael Rohs; Antonio Kruger; Christoph Stasch

269

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

270

Fear and anger: antecedents and consequences of emotional responses to mobile communication  

Microsoft Academic Search

Many people fear that exposure to mobile phone base stations leads to severe health effects. In addition to those fears, many citizens are unsatisfied or even angry about prevailing base station site-selection procedures. In the present study, it was investigated how these emotions, i.e. fear and anger, determine risk and benefit perceptions and the acceptance of mobile communication. Using structural

Simone Dohle; Carmen Keller; Michael Siegrist

2012-01-01

271

Polarisation of Electromagnetic Waves Analysis for Application in Mobile Communication Systems  

Microsoft Academic Search

The polarisation property of electromagnetic waves for applications in mobile communication systems has not been examined into detail yet. Due to multi-path effects and changes in the underlying coordinate systems of the involved antennas, the polarisation state of an electromagnetic wave at the receiving antenna of a mobile station is very likely to change. The presented project involves a data

J. Dousa; G. Wanielik

2006-01-01

272

Impact of array processing techniques on the design of mobile communication systems  

Microsoft Academic Search

Studies the application of adaptively steered arrays to mobile communications, particularly, in the design of base station antennas. System design issues are briefly reviewed on the basis of integration of those methods and the impact on transmitted power, co-channel reuse distance and spectrum efficiency is emphasized. Creating selective spatial channels enables to track the angular trajectory of each mobile and

V. A. N. Barroso; M. J. Rendas; J. P. Gomes

1994-01-01

273

A Novel Algorithm for Uplink Interference Suppression Using Smart Antennas in Mobile Communications  

Microsoft Academic Search

In recent years there has been an explosive growth in the number of wireless users, particularly in the area of mobile communication. In future, wireless mobile systems will be more sophisticated and more widespread. This growth has triggered an enormous demand not only for capacity but also better coverage and higher quality of service. Several new technologies have been explored

Kiran Kumar Shetty

2004-01-01

274

Fear and anger: antecedents and consequences of emotional responses to mobile communication  

Microsoft Academic Search

Many people fear that exposure to mobile phone base stations leads to severe health effects. In addition to those fears, many citizens are unsatisfied or even angry about prevailing base station site-selection procedures. In the present study, it was investigated how these emotions, i.e. fear and anger, determine risk and benefit perceptions and the acceptance of mobile communication. Using structural

Simone Dohle; Carmen Keller; Michael Siegrist

2011-01-01

275

The Process of Developing a Mobile Device for Communication in a Safety-Critical Domain  

Microsoft Academic Search

This paper describes the process of developing an interactive mobile system for use in a safety-critical domain. The system was developed to inquire into the extent of which coordination between people carrying out a collaborative work task can be improved by means of computer mediated communication on a mobile device. The application area for the device was controlling and monitoring

Jesper Kjeldskov; Jan Stage

2003-01-01

276

Design of the Access Network Segment of Future Mobile Communications Systems  

Microsoft Academic Search

An important component of future mobile communications systems is their access network segment that enables interworking between the mobile unit and the fixed network. In this paper we define and solve two important problems, related to the design of this segment. First, the efficient utilisation of the available radio spectrum. In this context we present a scheme that may be

E. C. Tzifa; V. P. Demesticha; P. P. Demestichas; M. E. Theologou; M. E. Anagnostou

1999-01-01

277

Mobile WiMAX-based communication network planning in Seribu Island by utilizing existing towers  

Microsoft Academic Search

An archipelago consisting of number of islands is relying on the broadband wireless technology to facilitate its telecommunication service. Mobile WiMAX (Worldwide Interoperability Mobile Access), as one of the broadband wireless technologies, is proposed to be applied as the network deployment in this paper. The network planning is designed based on cellular communication systems using hexagonal cells model. Five islands

Hardi Nusantara; Zaki Mujahid; Achmad Munir

2011-01-01

278

An Improved Low Computation Cost User Authentication Scheme for Mobile Communication  

Microsoft Academic Search

Most of existing user authentication schemes require high computation cost of exponentiation operations for the purpose of security. However, it is not suitable for mobile devices. In this article, we propose a low computation cost user authentication scheme for mobile communication. Our scheme uses only one-way hash functions and smart cards and can be implemented efficiently. The proposed scheme not

Chia-yin Lee; Chu-hsing Lin; Chin-chen Chang

2005-01-01

279

Two Decades of U. S. Army Mobile High-Frequency Communications  

Microsoft Academic Search

This paper is an historical account of the trend in development of U. S. Army high-frequency mobile radio communications of medium power in the period 1940 to 1960. Starting with one of the first really mobile sets of this power level, in a wide variety of installation configurations to meet World War II requirements, it relates the progressive fulfillment of

H. C. Hawkins

1960-01-01

280

A Study on the Performance Evaluation of Forward Link in CDMA Mobile Communication Systems  

Microsoft Academic Search

\\u000a In the CDMA cellular mobile communication systems, the connection between base and mobile station has a forward link from\\u000a base station to mobile station. Four channels of forward link, pilot channel, sync channel, paging channel, traffic channel,\\u000a have an absolute influence on forward coverage and speech quality. And overhead channels(pilot, sync, paging) are assigned\\u000a output at the adequate rate to

Sun-kuk Noh

2005-01-01

281

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.

282

Current Perspectives in Mass Communication Research. Volume One.  

ERIC Educational Resources Information Center

Since the study of human communication has emerged as a discipline more quickly than the development of its own channels of communication, this volume, first in a series, offers a status report on work currently attracting the attention of mass communication researchers. Contributors present review chapters on selected aspects of communication

Kline, F. Gerald, Ed.; Tichenor, Phillip J., Ed.

283

Prospects for Technical Communication: Research for Futures Needs.  

ERIC Educational Resources Information Center

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

Mathes, J. C.

284

The Value of Gender Studies to Professional Communication Research  

Microsoft Academic Search

This article reviews selected gender scholarship that informs the study of professional communication as well as some recent articles on professional communication that make use of gender studies. The article also suggests future research directions that include a merger of gender and professional communication scholarship. Topics covered include gender and communication and gender identity, along with gender and writing, reading,

MARY M. LAY

1994-01-01

285

A systemic focus for communications research, debate and policy  

Microsoft Academic Search

Communications content is manipulable only with extreme difficulty, and communications technology is only tenuously directable towards the social objectives of policy. Therefore a new, 'systemic' focus for communications policy, and the research and debate which support it is needed. A descriptive and analytical model of communications systems (called the CETTEMometer) is presented and demonstrated which focuses neither on content nor

Roger D. Popper

1982-01-01

286

Effect of Grouping in Local Communication System of Multiple Mobile Robots  

Microsoft Academic Search

For the cooperation in a large system with many mobile robots, local communication system is considered appro- priate in terms of the cost and capacity of communica- tion. The behavior of robots has a respectable effect on the efficiency of communication in such a local commu- nication system and it is essential to know what kind of behavior robots should

Eiichi YOSHIDA; Tamio ARAI Jun OTA; Tomoyoshi MIKI

1994-01-01

287

Vehicle Mobility Characterization Based on Measurements and Its Application to Cellular Communication Systems  

Microsoft Academic Search

SUMMARY Future cellular communication systems will be called upon to provide multimedia services (voice, data, and video) for various user platforms (pedestrians, cars, and trains) that have a variety of mobility characteristics. Knowledge of mo- bility characteristics is essential for planning, designing and oper- ating communication networks. The position data of selected ve- hicles (taxis) have been measured by using

Takehiko KOBAYASHI; Noriteru SHINAGAWA; Yoneo WATANABE

1999-01-01

288

Adaptive resource reservation schemes for proportional DiffServ enabled fourth-generation mobile communications system  

Microsoft Academic Search

Many mechanisms based on bandwidth reservation have been proposed in the literature to decrease connection dropping probability for handoffs in cellular communications. The handoff events occur at a much higher rate in packet-switched fourth generation mobile communication networks than in traditional cellular systems. An efficient bandwidth reservation mechanism for the neighboring cells is therefore critical in the process of handoff

Chenn-jung Huang; Yi-ta Chuang; Wei Kuang Lai; Yu-hang Sun; Chih-tai Guan

2007-01-01

289

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

Microsoft Academic Search

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

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

2008-01-01

290

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

291

The role of research methods in corporate communication  

Microsoft Academic Search

Posits that, while research is acknowledged by practitioners, a way of integrating the value of research methods into the day-to-day practice of corporate communications has not been found. Tests this by using appropriate research methodologies. Looks at the role of research and then examines research methods and corporate communication strategy. Concludes that communication is becoming a knowledge-based profession, and the

Gary P. Radford; Stuart Z. Goldstein

2002-01-01

292

International Research Network in European Political Communications  

NSDL National Science Digital Library

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

293

On mobile communications smart base-station system design  

Microsoft Academic Search

A design technique for mobile base-station antennas is presented. Beam tilting to avoid intersymbol interference is considered, and the orthogonal method (OM) under constraints on the radiation pattern is applied. The adaptive architecture of the mobile system, in conjunction with the direction of arrival (DoA) and the least mean square algorithms, is explained. A set of useful examples shows the

G. Miaris; E. Slachaloou; Theodoros Samaras; Sotirios Goudos; Elias Vafiadis; S. Panas

2005-01-01

294

Discovery and Integration of Mobile Communications in Everyday Life  

Microsoft Academic Search

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

Leysia Palen; Marilyn C. Salzman; Ed Youngs

2001-01-01

295

Communication of risk: health hazards from mobile phones  

Microsoft Academic Search

Possible health hazards from mobile phones arise from the use of the phones themselves and via the base stations that relay signals. Except for an increase in traffic accidents induced by the use of mobile phones in cars the evidence for a health hazard is at most indirect, but it cannot be entirely dismissed; the phones have not been widely

D. R. Cox

2003-01-01

296

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

297

The application of the diversity in mobile free-space optical communication  

Microsoft Academic Search

Traditional free-space optical (FSO) communications use a single transmitting antenna (laser\\/VCSEL\\/LED) and a receiving antenna (a photo-detector) for single channel communication between two nodes. In this paper we study two transmitting antenna one receiving antenna M-FSO (mobile FSO) communication system. In the process of single transmitting antenna moving, the optical beam broadens to make receive power smaller with the divergence

Yingchun Li; Rui Zhang

2008-01-01

298

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

PubMed

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

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

2013-07-22

299

Recasting Communication Theory and Research: A Cybernetic Approach.  

ERIC Educational Resources Information Center

The author's main concern is to provide a research format which will supply a unitary conception of communication. The wide range of complex topics and variety of concepts embraced by communication theory and the rather disparate set of phenomena encompassed by communication research create this need for a unitary study approach capable of linking…

Hill, Gary A.

300

Network design consideration of a satellite-based mobile communications system  

NASA Astrophysics Data System (ADS)

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.

301

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

ERIC Educational Resources Information Center

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

Kinash, Shelley; Brand, Jeffrey; Mathew, Trishita

2012-01-01

302

A Contribution to Theory Building for Mobile Marketing: Categorizing Mobile Marketing Campaigns through Case Study Research  

Microsoft Academic Search

Abstract Marketing experts consider the mobile device as an extremely promising marketing tool as it supports them tocope with their major challenge: getting time and attention from customers. Current mobile marketing research mostly covers success factors and acceptance analysis. Categorization, when addressed, lacks in appropriate foundation and is not linked to objectives atall. In this article we examine ,55 case

Dietmar Georg Wiedemann

2006-01-01

303

Aerospace Communications at the NASA Glenn Research Center.  

National Technical Information Service (NTIS)

The Communications Division at the NASA Glenn Research Center in Cleveland Ohio has as its charter to provide NASA and the Nation with our expertise and services in innovative communications technologies that address future missions in Aerospace Technolog...

F. A. Miranda

2006-01-01

304

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

305

Information and communication technologies and higher degree research supervision  

Microsoft Academic Search

For some time, higher degree research supervision has been the subject of research in universities. Universities have also been experiencing a boom in the use of information and communication technologies (ICTs) for mediating research, research training and teaching. While ICTs provide useful tools and greater connectivity for students and their supervisors and have the potential to transform supervision practice, communication

Charlie McKavanagh; Kay Bryant; Glenn Finger; Howard Middleton

306

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

2006-06-01

307

(Auto) mobile communication in a heterogeneous and converged world  

Microsoft Academic Search

In this article we discuss services and system architecture issues for future wireless communication in the vehicular environment. We consider the problem of wireless network heterogeneity that will be a consequence of emerging technologies such as wireless LANs, ad hoc networks, and broadcast systems, in addition to third-generation cellular standards like UMTS. In particular, a communication gateway architecture is proposed

Wolfgang Kellerer; Christian Bettstetter; Christian Schwingenschlögl; Peter Sties

2001-01-01

308

Satellite-aided mobile communications: Experiments, applications, and prospects  

Microsoft Academic Search

NASA's application technology satellites (ATS) 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, medical emergency, and for commercial uses in the land and maritime transportation industries. The technical success of the experiments and the demonstrated

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

1981-01-01

309

Satellite-aided mobile communications, experiments, applications and prospects  

Microsoft Academic Search

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

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

1980-01-01

310

A study on the regulations concerning base stations for next-generation mobile communications networks in Korea  

Microsoft Academic Search

Mobile communications services, which offer one way to realize the informed society of the 21st century, have developed rapidly worldwide. With the commercialization of CDMA 2000-1× late in 2000, a high-speed wireless Internet, based on a mobile communication network, appeared in Korea. This will develop into the next-generation of mobile communications (4G) with faster transmission of increased volumes of data

2004-01-01

311

Weather Information Communication Technologies for Increased Safety and Mobility in the National Airspace System.  

National Technical Information Service (NTIS)

The purpose of the NASA Glenn Research Center Weather Information Communications (WINCOMM) project was to develop advanced communications and information technologies to enable the high-quality and timely dissemination of strategic weather information bet...

D. R. Hilderman

2006-01-01

312

Research and implementation of multimedia communication systems  

Microsoft Academic Search

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

Yang Xi; Xue Fei

2011-01-01

313

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

314

Adaptive Transceivers for Mobile Free-Space Optical Communications  

Microsoft Academic Search

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

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

2006-01-01

315

Mobile phones and elderly people: a noisy communication.  

PubMed

Knowing the users is capital for building user-friendly digital interfaces. One way to think about the users is considering their familiarity with this technology. This article presents the results of twelve interviews with elderly people residing in the so-called South Zone of Rio de Janeiro (Brazil) who have used mobile phones over at least one year. It is part of the Doctor's Thesis "Mobile phones for elderly people - usability for social integration" ("Celulares para idosos - usabilidade a serviço da integração social"), which is targeted at ascertaining if the current mobile phones are user-friendly for elderly people. Through the technique of Guided Interviews, we found usage time, criteria for choice of phones, reasons for changes, preferences, and manners of use. Preliminarily, we have noticed differences in the behavior of the participating users and performed a qualitative analysis according to groups of age and gender. PMID:22316743

Stamato, Cláudia; Moraes, Anamaria de

2012-01-01

316

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

317

Modeling Self-Selection Bias in Interactive-Communications Research  

Microsoft Academic Search

Interactive media use is a key issue in contemporary and future communication research. However, when users can interact with messages, new sources of variation emerge that make generalization difficult. This article introduces methods that communication researchers can use to increase the external validity of studies investigating the effects of interactivity versus noninteractivity. For this area of research, the article recommends

Steven Bellman; Duane Varan

2012-01-01

318

From Research to Pedagogy: Teaching Gender and Communication.  

ERIC Educational Resources Information Center

Explores how tendencies to dichotomize women's and men's behavior according to expected roles, and modes of researching gendered communication, have led to linking and privileging men's modes of communication in the professional arena and women's modes of communication in intimate relationships. Discusses challenges and responsibilities…

Borisoff, Deborah; Hahn, Dan

1995-01-01

319

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

320

Defining Moments in Risk Communication Research: 1996–2005  

Microsoft Academic Search

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

Katherine A. McComas

2006-01-01

321

EXPLORATORY RESEARCH ON COMMUNICATION ABILITIES AND CREATIVE ABILITIES.  

ERIC Educational Resources Information Center

THIS STUDY SOUGHT TO IDENTIFY VARIABLES RELATED TO EFFECTIVENESS OF COMMUNICATION IN MILITARY OPERATIONS. THE GOAL WAS TO DEVELOP TESTS TO CLASSIFY OFFICERS AND AIRMEN, BASED UPON ALL OF THE BROAD COMMUNICATION ABILITIES NEEDED IN THE AIR FORCE. THE RESEARCH OUTLINE CONSISTED OF REVIEWING COMMUNICATION STUDIES AND OTHER TESTS, PREPARING A REDUCED…

TAYLOR, CALVIN W.; AND OTHERS

322

MIXes in Mobile Communication Systems: Location Management with Privacy  

Microsoft Academic Search

Summary. This paper introduces a new technique for location management in cellular networks. It avoids the recording of moving tracks of mobile subscribers. The described procedures are derived from the well known untraceable MIX network and the distributed storage of location information according to GSM networks.

Hannes Federrath; Anja Jerichow; Andreas Pfitzmann

1996-01-01

323

Particle swarm optimization for base station placement in mobile communication  

Microsoft Academic Search

The tremendous growth in the demand for mobile services results in an explosion in base station (BS) density and network complexity, making the conventional manual planning processes highly inefficient. In this paper, we give some novel adaptation to the recent bio-inspired optimization approach, Particle Swarm Optimization (PSO), to form a suitable algorithm for the base station placement problem. Considering the

Zhang Yangyang; Ji Chunlin; Yuan Ping; Li Manlin; Wang Chaojin; Wang Guangxing

2004-01-01

324

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

325

Enhancement of Bridge Management System (BMS) with Mobile Communication Technology  

Microsoft Academic Search

The accumulated BMS data is helpful for decisionmaking for bridge maintenance and repair work. This study developed the methodology for the application of mobile Internet-based KOBMS for bridge management with the PDA, by providing the basic scheme of the data flow for BMS is the most important.

Tai Sik Lee; Dong Wook Lee; Young Hyun Kim; Jeong Hyun Kim

2005-01-01

326

Acculturation and Communicative Mobility Among Former Soviet Nationalities.  

ERIC Educational Resources Information Center

Discusses the strategies that the former Soviet states are evolving to balance the interests of dominant ethnic groups with those of linguistic minorities while constructing a national identity, highlighting language policy in action and focusing on acculturation processes and geographic mobility among groups. A case study of Estonia is also…

Haarmann, Harald; Holman, Eugene

1997-01-01

327

Convolutional Turbo Coded OFDM\\/TDD Mobile Communication System for High Speed Multimedia Services  

Microsoft Academic Search

A novel mobile Internet access system based on the OFDM transmission technique is proposed and its performance is analyzed via computer simulations. Especially, OFDM is considered in combination with the TDMA\\/TDD scheme for a cellular mobile communication system. We present simulation results for the performance of a convolutional turbo coded OFDM\\/TDD system with QPSK, 16QAM, and 64QAM over ITU-R channel

Seong Chul Cho; Jin Up Kim; Kyu Tae Lee; Kyoung-rok Cho

2005-01-01

328

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

Microsoft Academic Search

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

Johannes Schöning; Michael Rohs; Antonio Krüger; Christoph Stasch

2008-01-01

329

Co-channel interference cancellation for DS-SS CDMA mobile communication system  

Microsoft Academic Search

In this paper, an elaborate co-channel interference (CCI) cancellation technique is introduced for the DS-SS CDMA mobile communication system. The performance of the CCI canceller (Yoon, et al., 1993) is extended and evaluated at the mobile station (MS) receiver operating in an extreme (worst) interference condition. The interference is a result of intersymbol interference (ISI) and multi-access interference (MAI) generated

K. M. Shaheen; Someshwar C. Gupta

1995-01-01

330

Design of multibeam CORPS-BFN for cellular mobile communications systems  

Microsoft Academic Search

The design of a beam-forming network (BFN) for multibeam-steerable antenna array using Coherently Radiating Periodic Structures (CORPS) in cellular mobile communication systems is presented. In this work, CORPS technology as a BFN is introduced in cellular systems. The CORPS-BFN proposed improves the performance over commonly used feeding networks used on mobile systems. The feeding ports of the network design are

Armando Arce-Casas; David H. Covarrubias Rosales; Marco A. Panduro Mendoza

2011-01-01

331

OFDM for data communication over mobile radio FM channels. I. Analysis and experimental results  

Microsoft Academic Search

The performance of OFDM\\/FM modulation for digital communication over Rayleigh-fading mobile radio channels is described. The use of orthogonal frequency division multiplexing (OFDM) over mobile radio channels was proposed by Cimini (1985). OFDM transmits blocks of bits in parallel and reduces the bit error rate (BER) by averaging the effects of fading over the bits in the block. OFDM\\/FM is

Eduardo F. Casas; C. Leung

1991-01-01

332

Characteristics of large deployable mesh reflector antennas for future mobile communications satellites  

NASA Astrophysics Data System (ADS)

A large deployable antenna is essential for effective mobile communication satellites. This paper describes the key technologies needed for such an antenna, the development plan, and the characteristics of various scale models. The electrical scale models of the mesh reflector antenna and the mechanical models of the deployable reflector have been constructed to aid in antenna design. The ultimate goal is a deployable mesh reflector antenna with 30-m diameter. The measured performance of the scale models corresponds closely to the calculated performance. These results will be extremely useful for designing large deployable mesh reflector antennas for mobile communication satellites.

Ebisui, Takashi; Iso, Akio; Orikasa, Teruaki; Sugimoto, Toshio; Sato, Shin-Ichi

1992-03-01

333

Mobile Communication Implementation Techniques to Improve Last Mile High Speed FSO Communication  

Microsoft Academic Search

\\u000a As an affordable alternative solution for the current generation last mile wireless communication network access, the FSO\\u000a – Free Space Optical Communication has vast development in supporting of FSO communication. The primary advantages of FSO\\u000a system are the license free optical nodes, higher data rates, easy to install with less expensive setup. However, obtaining\\u000a the reliable communication link and higher

R. Srinivasan; A. Vijayaraj

334

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

335

Potential Application of Laser Diodes to Free Space Optical Communication Between Mobile On-Sea Terminals  

Microsoft Academic Search

Potential use of medium power, 75 to 150 mW, laser diodes in free space optical communication between mobile on-sea terminals is investigated. For bit rates from 2.4 to 115.2 kbps, the maximum estimated communication distances are presented, considering different sources of ambient radiation by day and night and medium haze atmospheric conditions. The effects of the position and size of

Faruk Ozek

2001-01-01

336

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

337

Automatic device configuration and data validation through mobile communication  

Microsoft Academic Search

The introduction of personal computing and wireless communication technology provides an option for on site device software updating and data retrieving. This is especially true for any devices sitting in a remote site where computing network is not accessible. In many advanced computing systems, frequent software updating and configuration profiles refreshing are required. This is clumsy and error prone procedures

Wai-Leung Cheung; Y. F. Fung; Weizhao Wang; T. M. Chan

2003-01-01

338

Carrier aggregation for LTE-advanced mobile communication systems  

Microsoft Academic Search

In order to achieve up to 1 Gb\\/s peak data rate in future IMT-Advanced mobile systems, carrier aggregation technology is introduced by the 3GPP to support very-high-data-rate transmissions over wide frequency bandwidths (e.g., up to 100 MHz) in its new LTE-Advanced standards. This article first gives a brief review of continuous and non-continuous CA techniques, followed by two data aggregation

Guangxiang Yuan; Xiang Zhang; Wenbo Wang; Yang Yang

2010-01-01

339

An experimental OFDM system for broadband mobile communications  

Microsoft Academic Search

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

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

2001-01-01

340

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

341

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.

342

Mobile Wireless Active Networking: Issues and Research Agenda  

Microsoft Academic Search

Active network research has made significant strides over the last several years. While current research focuses on using active networking technology in wired networks, with emphasis gradually moving from active language environments toward dynamic service deployment, highly mobile and ad hoc networks open a completely new and challenging area of applications. We argue that active network technology will be most

Bernhard Plattner

343

Analysis of Multiantenna Architectures for Non-LOS Mobile-to-Mobile Communications in Cochannel Interference  

Microsoft Academic Search

The performance of multiantenna receivers in cochannel interference is investigated for narrowband links in a non-line-of-sight mobile-to-mobile channel. Channel impairments include Doppler spread and angular spread originating from scatterers in the vicinity of both the transmitter and the receiver. The analysis employs a two-ring scattering model and compares the performance of a sectored system employing selection combining (SC) to the

Thomas G. Pratt; Brett T. Walkenhorst; Heewon Kang

2007-01-01

344

Research in Space Commercialization, Technology Transfer, and Communications.  

National Technical Information Service (NTIS)

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 techno...

1982-01-01

345

Communication Research: New Challenges of the Latin American School.  

ERIC Educational Resources Information Center

Offers a review of Latin American scholarly research on communication processes from the 1940s to the early 1990s. Notes international interest in this research and the new challenges faced by it. (SR)

Marques de Melo, Jose

1993-01-01

346

Eiseikan Reza Tsuushin No Kenkyuu (Research on Intersatellite Laser Communication).  

National Technical Information Service (NTIS)

An overview of the research on intersatellite laser communication is presented. Components for acquisition and tracking system, and aberration compensating systems were trial produced. The range of trial production is shown in the diagram of research mode...

S. Yamamoto H. Arikawa S. Nakamori T. Araki

1992-01-01

347

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

348

Communication in Surveys: Examining Cognitive Effects in Survey Research.  

ERIC Educational Resources Information Center

|Panel studies have frequently been used by mass communication researchers. While these studies allow researchers to draw inferences about mass communication effects over time, they also tend to sensitize respondents to the issue under study. A study was undertaken to investigate panel effects by examining the survey interview as a medium of…

Salmon, Charles T.; And Others

349

A Critical Reflection on Comparative Communication Research Methods.  

ERIC Educational Resources Information Center

This paper examines the unresolved epistemological and theoretical problems in comparative communication research. The first section examines what "comparative" means by reviewing various fields in the social sciences. The second section provides an overview of epistemic assumptions of comparative communication research and suggests that in the…

Kang, Myung Koo

350

Mobile communications for monitoring heart disease and diabetes.  

PubMed

This paper describes a practical development project to enable the monitoring of vital signs data obtained from patients located in remote rural locations. The data are gathered from a wireless network of sensors attached to a patient's body and stored locally for secure transmission over existing communication infrastructures to a hospital server. Clinicians are then able to monitor the patient offline and upload diagnoses. PMID:21096431

Mulvaney, David; Woodward, Bryan; Datta, Sekharjit; Harvey, Paul; Vyas, Anoop; Thakker, Bashkar; Farooq, Omar

2010-01-01

351

Intercepting mobile communications: the insecurity of 802.11  

Microsoft Academic Search

The 802.11 standard for wireless networks includes a Wired Equivalent Privacy (WEP) protocol, used to protect link-layer communications from eavesdropping and other attacks. We have discovered several serious security flaws in the protocol, stemming from mis-application of cryptographic primitives. The flaws lead to a number of practical attacks that demonstrate that WEP fails to achieve its security goals. In this

Nikita Borisov; Ian Goldberg; David Wagner

2001-01-01

352

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

353

Analysis of the impact of phase- and amplitude distortions on the beam accuracy of active antenna arrays for mobile communication  

Microsoft Academic Search

In this paper a statistical analysis of the impact of phase- and amplitude-distortions on the performance of active antenna arrays for mobile communication base stations is presented. The cause and influence of different contributors to these distortions is described and the allowable phase- and amplitude-margins that need to be reached for mobile communication base station applications are derived. Finally a

Florian Pivit; Daniel Markert

2010-01-01

354

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

355

Development of software for mobile robot control over a radio frequency communications link  

Microsoft Academic Search

In the spring of 2001, work began on a mobile robot for an advanced computer engineering class. One of the key parts to the success of this robot would be the ability to control it from a computer terminal. In order to make this feasible, the computer would communicate to the robot through a wireless connection. The robot's on-board computer

Matthew B. Lister; Joseph T. Wunderlich

2002-01-01

356

Local map generation using position and communication history of mobile nodes  

Microsoft Academic Search

In this paper, we propose an algorithm to estimate 2D shapes and positions of obstacles such as buildings using GPS and wireless communication history of mobile nodes. Our algorithm enables quick recognition of geography, which is required in broader types of activities such as rescue activities in emergency situations. Nevertheless, detailed building maps might not be immediately available in private

Shinichi Minamimoto; Sae Fujii; Hirozumi Yamaguchi; Teruo Higashino

2010-01-01

357

A middleware for service-oriented communication in mobile disaster response environments  

Microsoft Academic Search

Today, the work of disaster response teams is being increas- ingly supported and coordinated by using portable comput- ing devices. Connected to mobile ad-hoc networks, these devices establish a communication infrastructure immune to damages caused by natural disasters. However, ad-hoc net- works are dynamic and volatile environments, which ham- pers hosting of critical applications relying on fast respon- siveness. These

Lukasz Juszczyk; Schahram Dustdar

2008-01-01

358

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

Microsoft Academic Search

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

W. Akle

1983-01-01

359

Efficient QoS Provisioning for Adaptive Multimedia in Mobile Communication Networks by Reinforcement Learning  

Microsoft Academic Search

The scarcity and large fluctuations of link bandwidth in wireless networks have motivated the development of adaptive multimedia services in mobile communication networks, where it is possible to increase or decrease the bandwidth of individual ongoing flows. This paper studies the issues of quality of service (QoS) provisioning in such systems. In particular, call admission control and bandwidth adaptation are

Yu Fei; Vincent W. S. Wong; Victor C. M. Leung

2006-01-01

360

Efficient QoS Provisioning for Adaptive Multimedia in Mobile Communication Networks by Reinforcement Learning  

Microsoft Academic Search

The scarcity and large fluctuations of link bandwidth in wireless networks have motivated the development of adaptive multimedia services in mobile communication networks, where it is possible to increase or decrease the bandwidth of individual ongoing flows. This paper studies the issues of quality of service (QoS) provisioning in such systems. In particular, call admission control and bandwidth adaptation are

Fei Yu; Vincent W. S. Wong; Victor C. M. Leung

2004-01-01

361

Transaction Based Authentication Scheme for Mobile Communication: A Cognitive Agent Based Approach  

Microsoft Academic Search

The vulnerable air interface, device level constraints, and insecure encryption techniques of wireless networks have naturally increased the chance of attacker obtain- ing users information fraudulently. Most of the existing authentication systems for mobile communication princi- pally depends on the strength of authenticating identifiers. Once the client who may be genuine or an attacker, suc- cessfully proves the possession of

B. Sathish Babu; Pallapa Venkataram

2007-01-01

362

A frame synchronization method for adaptive array antennas in digital mobile communications  

Microsoft Academic Search

This paper proposes a frame synchronization method for an adaptive array antenna (AAA) used in digital mobile communications. The proposed scheme, which is based on the maximum likelihood estimation (MLE), calculates error signals by subtracting a training sequence convolved with an estimated channel impulse response from the AAA outputs and searches for the timing that minimizes the mean squared errors.

Kazuhiko Fukawa; Hiroshi Suzuki

2005-01-01

363

VHF maritime mobile communications: A systems approach to serving user requirements  

Microsoft Academic Search

The existing international VHF maritime mobile communication system dates back to the 1947 International Radio Conference at Atlantic City, NJ. At that time, there was formal agreement on the place in the spectrum (built around the use of 156.80 MHz), and informal agreement on the use of a channel bandwidth of 100 kHz. This paper documents the events leading to

J. Renner

1977-01-01

364

Towards a secure mutual authentication and key exchange protocol for mobile communications  

Microsoft Academic Search

We analyze several mutual authentication and key exchange protocols (MAKEPs), and present a number of essential properties of the protocols for secure mobile communications. To address the weaknesses of existing protocols, we propose an improved version of MAKEP known as EC-MAKEP. Besides supporting the essential features present in the existing protocols, the proposed protocol also provides the user anonymity and

Yi-Jun He; Moon-Chuen Lee

2008-01-01

365

Investigation of antennas for two-way mobile communications in the VHF and UHF regions  

Microsoft Academic Search

Due to the nature of two-way mobile communications the normal requirement is for base station antennas, as well as the vehicular antennas, to have radiation characteristics which are omnidirectional in azimuth. It is therefore necessary first to investigate the spatial distribution of energy and then to investigate means for confining the radiation in the elevation plane so far as possible

E. F. Harris

1959-01-01

366

The public's knowledge of mobile communication and its influence on base station siting preferences  

Microsoft Academic Search

The present paper explores what people know about mobile communication and how this understanding influences people's perceptions and preferences in regard to this omnipresent technology. As shown in the past, cell phone base station siting often turns out to be a conflictive process. Citizens are not willing to tolerate base stations in their neighbourhoods because they fear health consequences. They

Marie-Eve Cousin; Michael Siegrist

2010-01-01

367

Microstrip patch antenna array for a mobile communication system base station  

Microsoft Academic Search

A dual-band low cost linear array of planar microstrip patches is presented. It has been designed, fabricated and tested to be used as the base station antenna of a mobile communication system at 2 GHz. An adequate coverage of an elongated rectangular cell is provided

A. Armogida; C. Peixeiro

1997-01-01

368

Base-station tracking in mobile communications using a switched parasitic antenna array  

Microsoft Academic Search

Base-station tracking in mobile communications benefits from a directional antenna and so requires direction finding technology. A novel technique for electronically directing the radiation pattern of an antenna array employs a directional array with only one active element and three parasitic elements operating near resonance. Three different methods of direction finding are assessed; a coarse angular location method, a precise

Stephanie L. Preston; David V. Thiel; Trevor A. Smith; S. G. O'Keefe; Jun Wei Lu

1998-01-01

369

The Magnetoelectric Dipole—A Wideband Antenna for Base Stations in Mobile Communications  

Microsoft Academic Search

In this paper, stringent requirements imposed on the design of base station antennas for mobile communications are summarized. Conventional techniques for implementing base station antennas are reviewed. The complementary antenna concept of combining an electric dipole with a magnetic dipole is reconsidered. Recently, this kind of antenna has been commonly called a “Huygen's source.” The purpose is to develop wideband

Kwai-Man Luk; Biqun Wu

2012-01-01

370

The Future Generations of Mobile Communications Based on Broadband Access Methods  

Microsoft Academic Search

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

Shingo Ohmori; Yasushi Yamao; Nobuo Nakajima

2001-01-01

371

Field strength prediction by ray-tracing for adaptive base station positioning in mobile communication networks  

Microsoft Academic Search

The Adaptive Base Station Positioning Algorithm (ABPA) is presented, which is based on a neural net approximation of the trac density in the coverage area of a cellular mobile communication system. ABPA employs simulated annealing, thereby achieving quasi-optimal base station locations depending on the topography of the investigated area. Furthermore, ABPA considers the radio wave propagation within this area for

Fritsch K. Tutschku; K. Leibnitz

1995-01-01

372

Downlink channel modeling for mobile communications with smart antennas at the base station  

Microsoft Academic Search

In this paper, an approach is presented to enable down-link channel modeling for mobile communication systems with smart antennas at the base station (BS). Based on the assumption that the angle of departure (AOD) at the BS is uniformly distributed, closed-form expressions are provided for the probability density function (PDF) of the azimuth angle of arrival (AOA), power spectral density

Qi Yao; Matthias Patzold

2003-01-01

373

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

374

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

375

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

376

Channel Assignment and Reassignment Using Co-channel Cells in Mobile Communication Networks  

Microsoft Academic Search

The channel assignment problem arises in a mobile communication network whenever there is an installation of a new base station or one cell is split into two or more cells or power of the base station is changed. Channel assignment or reassignment is an NP-hard problem and generally a heuristic approach is used for solving large sized problems. We have

Siba K. Udgata; Shobhit Srivastava; Hitesh Mahajan; Gauri K. Udgata

2008-01-01

377

The 2 GHz high temperature superconducting receiver equipment for mobile communications  

Microsoft Academic Search

An ultra low noise and highly selective, experimental 2 GHz band cryogenic receiver front end (CRFE) has been newly developed for mobile communication base stations. It utilizes a high-Q superconducting filter, a very low noise cryogenic amplifier, and a highly reliable cooler that is very compact. The equivalent noise temperature (Teq) of the CRFE is less than 50 K (0.69

K. Satoh; T. Mimura; S. Narahashi; T. Nojima

2001-01-01

378

Information Capacity of the Space Division Multiple Access Mobile Communication System  

Microsoft Academic Search

An expression for the Shannon capacity lower bound of the space division multiple access (SDMA) mobile communication channel with interference is shown. The bound is tightly approaching the Shannon capacity of the orthogonal SDMA system over Gaussian channel with no interference. The information capacity of the SDMA system with adaptive MMSE receivers is presented as well. The SDMA system with

Predrag B. Rapajic

1999-01-01

379

Random spacing channel assignment to reduce the nonlinear intermodulation distortion in cellular mobile communications  

Microsoft Academic Search

In cellular mobile communications, only a subset of all available frequency channels are assigned to each cell, hence, the interchannel spacing of channels is wider than the required minimum. In this paper, a random spacing channel assignment (RSCA) scheme is proposed which exploits the wider interchannel spacing of assigned channels in each cell to reduce the most deleterious third-order intermodulation

Hanwook Jung; Ozan K. Tonguz

1999-01-01

380

Characteristics of large deployable mesh reflector antennas for future mobile communications satellites  

Microsoft Academic Search

A large deployable antenna is essential for effective mobile communication satellites. This paper describes the key technologies needed for such an antenna, the development plan, and the characteristics of various scale models. The electrical scale models of the mesh reflector antenna and the mechanical models of the deployable reflector have been constructed to aid in antenna design. The ultimate goal

Takashi Ebisui; Akio Iso; Teruaki Orikasa; Toshio Sugimoto; Shin-Ichi Sato

1992-01-01

381

Characteristics of scale models of large deployable mesh reflector antenna for mobile communications satellites  

Microsoft Academic Search

In the land mobile satellite system (LMSS) using a geostationary platform (GPF), a 30 m diameter satellite antenna is desirable for small portable terminal communications. SCR has adopted two deployment types of antenna structure, the Hexa-Link Truss reflector and the Tetra-Triagonal Prism Truss (TETRUS) reflector, and has developed scale models of them. Both of them represent important aspects of large

Akira Akaishi; Teruaki Orikasa; Kanshiro Kashiki; Teruki Okamoto; Yuichi Otsu; Hideo Satoh

1993-01-01

382

Characteristics of scale models of large deployable mesh reflector antennas for mobile communications satellites  

Microsoft Academic Search

In the land mobile satellite system (LMSS) using a geostationary platform (GPF), a 30 m diameter satellite antenna is desirable for small portable terminal communications. SCR has adopted two deployment types of antenna structure, the Hexa-Link Truss reflector and the Tetra-Triagonal Prism Truss (TETRUS) reflector, and has developed scale models of them. Both of them represent important aspects of large

Akira Akaishi; Teruaki Orikasa; Kanshiro Kashiki; Teruki Okamoto; Yuichi Otsu; Hideo Satoh

1993-01-01

383

Digitally programmable RF front-ends: towards universal mobile communication service  

Microsoft Academic Search

Summary form only given. This presentation discusses the evolution of the wireless industry and focuses on transceiver architectures and circuit design techniques used in modern cost effective mobile communication systems. Architectures and design techniques suitable for multi-standard, low power transceivers achieving higher levels of integration are presented. The techniques exploit recent developments in submicron BiCMOS and CMOS VLSI techniques together

M. Ismail

2000-01-01

384

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

385

User and Concept Studies as Tools in Developing Mobile Communication Services for the Elderly  

Microsoft Academic Search

The basis of this study was the ageing of the population all over the world. The study concentrated on finding out the key service needs of elderly people. The service needs from the end users’ as well as the experts’ perspective were gathered by means of various group methods such ideation sessions. Four mobile communication service concepts were created using

M. Mikkonen; S. Väyrynen

2002-01-01

386

A mobile ad-hoc satellite and wireless Mesh networking approach for Public Safety communications  

Microsoft Academic Search

It is widely recognized that emergency management and disaster recovery systems are an issue of paramount importance in communities through the world. The definition of a public safety communications infrastructure is a high-priority task due to the lack of interoperability between emergency response departments, the reduced mobility during coordinated operations on a broad scale and the need for access to

G. Iapichino; C. Bonnet; O. del Rio Herrero; C. Baudoin; I. Buret

2008-01-01

387

A new frequency channel assignment algorithm in high capacity mobile communication systems  

Microsoft Academic Search

A new algorithm for frequency channel assignment in mobile radio communication is proposed. The algorithm uses flexible fixed channel assignment which enables the calls having all their nominal channels busy to borrow channels from the neighboring cells provided that co-channel interference will not result. The borrowed channel cannot be used in three interfering cells; therefore reassignment strategy is used when

S. M. Elnoubi; R. Singh; S. C. Gupta

1982-01-01

388

Evolutionary simulation of an agent based mobility system using indirect communication  

Microsoft Academic Search

We study the evolutionary dynamics of a mobility system in which agents are able to explore the environ- ment and to communicate between them in order to increase the eciency of the system, i.e. to minimize the average time needed to reach their goal, choosing the quickest path and avoiding the formation of trac jams. The agents use an evolvable

Francesco Zanlungo

389

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

390

A frame synchronization method for underwater acoustic communication on mobile platform  

Microsoft Academic Search

In this paper, we propose a frame synchronization method for underwater acoustic communication on mobile platform. This new method involves transmitting signal based on hyperbolic frequency modulated (HFM) signal as a preamble of the frame, while the receiver uses a correlator which is matched to the transmitted signal. This method can provide us with good signal detection ability which is

Feng Wei; Xu Xiaomei; Zhang Lan; Chen Yougan

2010-01-01

391

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

Microsoft Academic Search

Two satellite position reporting has been introduced into the OmniTRACS mobile satellite communication system. This system significantly improves position reporting reliability and accuracy while simplifying the terminal's hardware. The positioning technique uses the original OmniTRACS TDMA timing signal formats in the forward and return link directions plus an auxiliary, low power forward link signal through a second satellite to derive

William G. Ames

1990-01-01

392

Exploring the Potential of Mobile Services to Support Learning and Communication in University Classes  

Microsoft Academic Search

This paper presents initial results of our on-going activities regarding the use of smart phones and mobile services in university classrooms at Vaxjo University. The purpose of these trials was to explore and identify which content and services could be delivered to the smart phones in order to support learning and communication in the context of university studies. The activities

Marcelo Milrad; Daniel Bergman; Michele H. Jackson

2005-01-01

393

Design, implementation, and use of a real-time distributed simulation testbed for mobile communication networks  

Microsoft Academic Search

There is a need to design, develop, and test new mobile communication networks for military applications. The hardware cost to outfit a single node may be quite high. Much of the cost is in rf hardware, modems, and encryption devices. Replicating such costs over several nodes and adding the cost of maintaining a field site can quickly lead to unacceptable

Dennis J. Baker

1997-01-01

394

Design, implementation, and use of a real-time distributed simulation testbed for mobile communication networks  

NASA Astrophysics Data System (ADS)

There is a need to design, develop, and test new mobile communication networks for military applications. The hardware cost to outfit a single node may be quite high. Much of the cost is in rf hardware, modems, and encryption devices. Replicating such costs over several nodes and adding the cost of maintaining a field site can quickly lead to unacceptable budget levels. One solution to this problem is, in the initial development and testing phase, to develop network communication systems that can operate with either real or simulated transmitters, receivers, modems, etc. This paper describes how we accomplished this task for the development of a high frequency, data/voice (D/V) mobile network. The underlying, distributed, real-time simulation software evolved from Sim++2. On top of this we built a simulation package to model mobile communication networks. Software for the SubNet Controller (SNC) of the hf D/V Network was developed to work with these simulation packages as well as to work with real rf equipment. The SNC software was tested in a 6-node network in which some of the rf equipment was simulated and some was real. The resultant system provides a testbed for examining the performance of command and control systems that must operate over mobile rf communication systems.

Baker, Dennis J.

1997-06-01

395

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

396

Energy locality: processing\\/communication\\/interface tradeoffs to optimize energy in mobile systems  

Microsoft Academic Search

Summary form only given, as follows. As computers continue to shrink, research and commercial interest in mobile\\/wearable computing is rapidly growing. Unlike traditional desktop computing in which the user is required to come to the computer, mobile computing brings the computer to the user. Mobile\\/wearable computers represent the next evolutionary step in the trend toward more people-centric computing. One of

D. Siewiorek

2001-01-01

397

Impersonation Attacks on a Mobile Security Protocol for End-to-End Communications  

NASA Astrophysics Data System (ADS)

This paper presents an analysis of a cryptographic security protocol that is designed for use in a mobile communication environment. The goal of the analysed protocol is to ensure secure end-to-end communication between two mobile users that are connected to different base stations. The analysis reveals a serious flaw in the used signature scheme of the security protocol. Exploitation of this flaw enables an intruder to use algebraic simplifications to forge signatures on arbitrary messages. Two attacks, which exploit this weakness, are detailed showing the impersonation of a mobile user and a base station, respectively. Corrections to the flawed protocol are proposed and analysed. It is established that the corrected protocol is secure against the presented attacks.

Dojen, Reiner; Pasca, Vladimir; Coffey, Tom

398

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

399

A parametric approach for low energy wireless data communication [mobile multimedia computing\\/communication applications  

Microsoft Academic Search

In this paper, a joint control methodology of error protection capability and modulation strategy is presented to minimize the energy dissipation of a given communication. The communication energy includes the energy consumption of the underlying digital (channel encoder\\/decoder) and analog blocks including the RF amplifier. The energy dissipation of these blocks is determined by the system configuration parameters like channel

Hunsoo Choo; Kaushik Roy

2004-01-01

400

An approach to dyadic communication in historical social movements: Dyadic communication in Maoist insurgent mobilization  

Microsoft Academic Search

The paucity of word?by?word transcriptions of movements' dyadic interactions need not completely preclude investigation of historical movements’ dyadic communication. Scholars can study the constraints that urged a movement to select dyadic communication and the general strategies used in movement dyads. Three kinds of data can be used to reconstruct general strategies used in dyads: (1) the theoretical writings of movement

J. F. Walsh Jr

1986-01-01

401

Culturally adaptive mobile agent dialogue to communicate with people in crisis recovery  

Microsoft Academic Search

We present ongoing research concerning the interaction between users and environmental agencies through autonomous mobile agents in the environmental monitoring domain. The overarching EU FP7 project DIADEM, concerns the development of a system that detects potentially hazardous situations in populated areas using input from both a distributed sensor network and humans through their mobile devices. We propose a model of

Vanessa Evers; Andi Winterboer; Gregor Pavlin; Frans Groen

2010-01-01

402

Culturally adaptive mobile agent dialogue to communicate with people in crisis recovery  

Microsoft Academic Search

We present ongoing research concerning the interaction between users and environmental agencies through autonomous mobile agents in the environmental monitoring domain. The overarching EU FP7 project DIADEM, concerns the development of a system that detects potentially hazardous situations in populated areas using input from both a distributed sensor network and humans through their mobile devices. We propose a model of

V. Evers; A. Winterboer; G. Pavlin; F. Groen

2009-01-01

403

Using Mobile Robots to Teach Articial Intelligence Research Skills  

Microsoft Academic Search

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

Daniel M. Gaines; Natasha Balac

404

Controlled mobility of unmanned aircraft chains to optimize network capacity in realistic communication environments  

NASA Astrophysics Data System (ADS)

This dissertation presents a decentralized gradient-based mobility control algorithm for the formation and maintenance of an optimal end-to-end communication chain using a team of unmanned aircraft acting as communication relays. With the use of unmanned aircraft (UA) as communication relays, a common mode of operation is to form a communication relay chain between a lead exploring node (which may be ground based or another UA) and a control station. In this type of operation the lead node is typically deployed to explore (sense) a remote region of interest that is beyond direct radio frequency (RF) communication range, or out of line-of-sight, to the control station. To provide non-line-of-sight service, and extend the communication range of the lead node, unmanned aircraft acting as communication relays are deployed in a convoy fashion behind the lead vehicle to form a cascaded relay chain. The focus of this work is the use of the mobility of a fixed number of relay aircraft to maximize the capacity of a directed communication chain from a source node to a destination node. Local objective functions are presented that use the signal-to-noise-and-interference ratio (SNIR) of neighbor communication links as inputs to maximize the end-to-end capacity of packet-based and repeater-type network chains. An adaptive gradient-based SNIR controller using the local objective function can show significant improvement in the capacity of the communication chain that is not possible with range-based controllers, or static deployment strategies, in RF environments containing unknown localized noise sources and terrain effects. Since the SNIR field is unknown, an online estimate of the SNIR field gradient is formed using methods of Stochastic Approximation from the orbital motion of the aircraft tracking a control point. Flight demonstrations using the Networked Unmanned Aircraft System Command, Control and Communications testbed were conducted to validate the controller presented herein. Results from flight experiments show that mobility of unmanned aircraft, following locally estimated SNIR gradients, can be used to form a locally optimized communication chain by driving the aircraft to locations that improve the end-to-end capacity of the chain over that of a range-based controller or a static deployment algorithm.

Dixon, Cory

405

PS1-10: Patient-Centered Cancer Communication and Care Coordination Research in the Cancer Communication Research Center.  

PubMed

Background/Aims For over four years, CRN Cancer Communication Research Center (CCRC)-affiliated investigators have conducted research into patient-centered cancer communication and care coordination. One of 5 National Cancer Institute-funded Centers of Excellence in Cancer Communication Research, the CRN CCRC is the only center whose primary focus is studying and improving clinical care. This abstract describes CCRC research, lessons learned, and future directions. Methods CCRC research studies include two RO1-type projects; one focuses on enhancing communication and coordination through innovative use of nurse navigators in oncology care; the other focuses on understanding and improving clinician-patient communication related to breakdowns in cancer care. CCRC pilot studies have explored diverse topics including improving communication to reduce home medication errors in pediatric oncology, clinician-patient communication around prostate cancer screening decisions, the relationship between "oral" health literacy and colorectal cancer screening, and direct-to-consumer communication about genetic testing. An NCI-funded supplement explored stakeholders' views on collecting patient reports of cancer-related communication, while another examined the feasibility of cancer prognostic tools in clinical practice. Results Setting CCRC studies in CRN clinical systems has provided the distinct advantage of allowing researchers to examine feasibility as well as effectiveness of interventions. Patients, clinicians and clinical leaders have all expressed support for CCRC efforts to improve communication and care coordination, acknowledging the importance of communication in cancer care. At the same time, leaders and clinicians are conscious of increasing time constraints, competing priorities, and limited resources. Patients are willing to share their experiences and insights, as long as doing so does not jeopardize their care, or distract them from their battle with cancer. Conclusions Patient-centered communication and care coordination are central to quality cancer care. CCRC research projects have engendered support and enthusiasm among the clinical systems, but have also faced significant challenges. Ultimately, the CCRC has provided CRN researchers with opportunities to develop and test multi-level interventions focusing on cancer communication and care coordination in clinical systems. Going forward, CCRC-affiliated researchers look forward to implementing systems for collecting patient reports of communication experiences across the cancer care continuum, and to expanding communication research capabilities within the CRN. PMID:24085869

Mazor, Kathleen

2013-09-01

406

PS1-10: Patient-Centered Cancer Communication and Care Coordination Research in the Cancer Communication Research Center  

PubMed Central

Background/Aims For over four years, CRN Cancer Communication Research Center (CCRC)-affiliated investigators have conducted research into patient-centered cancer communication and care coordination. One of 5 National Cancer Institute-funded Centers of Excellence in Cancer Communication Research, the CRN CCRC is the only center whose primary focus is studying and improving clinical care. This abstract describes CCRC research, lessons learned, and future directions. Methods CCRC research studies include two RO1-type projects; one focuses on enhancing communication and coordination through innovative use of nurse navigators in oncology care; the other focuses on understanding and improving clinician-patient communication related to breakdowns in cancer care. CCRC pilot studies have explored diverse topics including improving communication to reduce home medication errors in pediatric oncology, clinician-patient communication around prostate cancer screening decisions, the relationship between “oral” health literacy and colorectal cancer screening, and direct-to-consumer communication about genetic testing. An NCI-funded supplement explored stakeholders’ views on collecting patient reports of cancer-related communication, while another examined the feasibility of cancer prognostic tools in clinical practice. Results Setting CCRC studies in CRN clinical systems has provided the distinct advantage of allowing researchers to examine feasibility as well as effectiveness of interventions. Patients, clinicians and clinical leaders have all expressed support for CCRC efforts to improve communication and care coordination, acknowledging the importance of communication in cancer care. At the same time, leaders and clinicians are conscious of increasing time constraints, competing priorities, and limited resources. Patients are willing to share their experiences and insights, as long as doing so does not jeopardize their care, or distract them from their battle with cancer. Conclusions Patient-centered communication and care coordination are central to quality cancer care. CCRC research projects have engendered support and enthusiasm among the clinical systems, but have also faced significant challenges. Ultimately, the CCRC has provided CRN researchers with opportunities to develop and test multi-level interventions focusing on cancer communication and care coordination in clinical systems. Going forward, CCRC-affiliated researchers look forward to implementing systems for collecting patient reports of communication experiences across the cancer care continuum, and to expanding communication research capabilities within the CRN.

Mazor, Kathleen

2013-01-01

407

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

408

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

PubMed Central

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

2013-01-01

409

Prospects of satellite communications for mobiles: Towards a global mobile space segment  

NASA Astrophysics Data System (ADS)

Terrestrial, maritime, and air transportation applications of communications satellites are considered. Communicating with long distance trucks can be achieved by text transmission which is cheaper than voice links, avoids access problems, and uses the frequency spectrum more efficiently. The need to accept fast and slow air traffic in the same air space, especially near airports, creates safety problems that can be overcome by equipping aircraft with a satellite controlled display device, showing traffic in the vicinity. The maritime satellite service is characterized by low market penetration that can be improved by cutting equipment costs, e.g., by decreasing ship antenna performance and using high gain satellite antennas, producing narrow beams.

Rosetti, C.

1981-11-01

410

Technological Model of the Independent Power Supply with Converters of Renewable Energy for Base Station of Mobile Communication  

Microsoft Academic Search

In Uzbekistan is present very much of items, which compactly dispersed near to underground water wells and the mountain rivers, deprived of the centralized power supply and network of communication. The basic activity of the inhabitants of these areas is the farm and for its development wireless mobile communication could be in perspective to replace telephone communication. But the embrace

B. M. Makhkamdjanov

2006-01-01

411

AMALi - the Airborne Mobile Aerosol Lidar for Arctic research  

Microsoft Academic Search

The Airborne Mobile Aerosol Lidar (AMALi) is an instrument developed at the Alfred Wegener Institute for Polar and Marine Research for reliable operation under the challenging weather conditions at the Earth's polar regions. Since 2003 the AMALi has been successfully deployed for measurements in ground-based installation and zenith- or nadir-pointing airborne configurations during several scientific campaigns in the Arctic. The

I. S. Stachlewska; R. Neuber; A. Lampert; C. Ritter; G. Wehrle

2010-01-01

412

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

413

Student Mobility Research: Next Steps. Engage. Fall/Winter 2009  

ERIC Educational Resources Information Center

This "Engage" newsletter features articles on student mobility research, supporting the BC Transfer System and inter-provincial initiatives. It announces the publication of five reports profiling students who transferred to British Columbia universities in the period 2003-04 to 2007-08. These reports provide detailed demographic and performance…

British Columbia Council on Admissions and Transfer, 2009

2009-01-01

414

Researcher mobility and technology transfers: How 'patriotic' are university scientists?  

Microsoft Academic Search

University technology transfer has attracted considerable attention in the literature with a focus on the institutions, the agents involved in technology commercialization or the differentiation between formal and informal technology transfer mechanisms. There has, however, been little systematic research on the trajectories of technology transfers with regard to the individual scientist and his or her international mobility. In order to

Jakob Edler; Heide Fier; Christoph Grimpe

415

Voice over IP: how computing technology is being used in mobile communications.  

PubMed

This article explains how computing technology was used to address the need for mobile communications among nursing staff. In 2004, nursing staff at Fauquier Hospital relocated from one nursing floor in an older building to two floors in a new structure. This resulted in complaints and supervision issues as nursing managers, who had previously been relatively sedentary, now became quite mobile as they attempted to control nursing operations on two separate floors. Complaints arose from several sources. Nursing staff and managers both complained about the increased difficulty in communicating with each other Physicians expressed frustration to hospital administration at playing "telephone tag" with managers. The solution involved Internet Protocol technology that is in widespread use on most computer networks. The article details how this technology was selected over several other communications technologies and used to implement wireless telephony over the hospital's existing computer network. It reviews key standards and technologies and issues surrounding their use. Finally, the article demonstrates how this computing technology improved patient care by facilitating mobile communications. PMID:16266029

Johnson, William

2005-01-01

416

A Conceptual Model for Communications Research  

Microsoft Academic Search

Because it so clearly represents the role of the professional journalist in communicating the news, the Quarterly publishes herewith a revision of an article which has excited extensive comment since it first appeared. The authors are teachers of journalism who have had inter-disciplinary Ph.D. programs.

Bruce H. Westley; Malcolm S. MacLean

1957-01-01

417

Communicating Employee Benefits: Directions for Future Research  

Microsoft Academic Search

Organizations throughout this country invest enormous amounts of money in their fringe benefit programs, expecting such returns on in vestment as attracting and holding good employees, improving morale and productivity, and simply keeping the union out. Unfortunately, these returns are not forthcoming, quite often because of inadequate communication of the benefit program to employees. This article pre sents a model

Richard C. Huseman; John D. Hatfield

1978-01-01

418

Building Collective Communication Competence in Interdisciplinary Research Teams  

ERIC Educational Resources Information Center

|Using a grounded theory approach, this investigation addresses how an interdisciplinary research (IDR) team negotiates meaning and struggles to establish and sustain a sense of collective communication competence (CCC). Certain communication processes were foundational to building CCC, such as spending time together, practicing trust, discussing…

Thompson, Jessica Leigh

2009-01-01

419

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.

420

A power?analytic examination of contemporary communication research  

Microsoft Academic Search

While Type I error has enjoyed widespread attention in communication research, the interrelated concepts of statistical power and Type II error have been generally neglected. In order to assess the extent of the disregard for these considerations, a statistical power analysis of the articles published in the 1973 volumes of the nine major communication journals was conducted. The results indicated

Lawrence J. Chase; Raymond K. Tucker

1975-01-01

421

Mobile health in china: a review of research and programs in medical care, health education, and public health.  

PubMed

There are nearly 1 billion mobile phone subscribers in China. Health care providers, telecommunications companies, technology firms, and Chinese governmental organizations use existing mobile technology and social networks to improve patient-provider communication, promote health education and awareness, add efficiency to administrative practices, and enhance public health campaigns. This review of mobile health in China summarizes existing clinical research and public health text messaging campaigns while highlighting potential future areas of research and program implementation. Databases and search engines served as the primary means of gathering relevant resources. Included material largely consists of scientific articles and official reports that met predefined inclusion criteria. This review includes 10 reports of controlled studies that assessed the use of mobile technology in health care settings and 17 official reports of public health awareness campaigns that used text messaging. All source material was published between 2006 and 2011. The controlled studies suggested that mobile technology interventions significantly improved an array of health care outcomes. However, additional efforts are needed to refine mobile health research and better understand the applicability of mobile technology in China's health care settings. A vast potential exists for the expansion of mobile health in China, especially as costs decrease and increasingly sophisticated technology becomes more widespread. PMID:23915211

Corpman, David W

2013-08-05

422

International temporary mobility of researchers: a cross-discipline study  

Microsoft Academic Search

The increasing literature addressing international mobility of researchers has repeatedly pointed out the lack of empirical\\u000a data compiled over the last two decades, jeopardizing progress in the understanding of the characteristics and impacts of\\u000a such human flows. This paper makes a contribution to the field by exploring the extent to which information obtained from\\u000a researchers’ electronic curriculum vitae (CV) may

Carolina CanibanoF; F. Javier Otamendi; Francisco Solís

423

Toward Theory-Based Research in Political Communication.  

ERIC Educational Resources Information Center

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

Simon, Adam F.; Iyengar, Shanto

1996-01-01

424

Research Issues in the Next Generation Group Communication Services.  

National Technical Information Service (NTIS)

The main objective of the proposed research was to investigate five important practical issues in the design of high performance, heterogeneous group communication services for constructing the next generation defense applications. These issues are: (1) F...

S. Mishra

2000-01-01

425

The Status of Research on Women and Communication.  

ERIC Educational Resources Information Center

|Surveys and summarizes the research published in speech communication journals on (1) historical treatments of women (2) sex differences; (3) images of women in the media; (4) education and pedagogy; and (5) surveys and integrative works. (PD)|

Foss, Karen A.; Foss, Sonja K.

1983-01-01

426

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

NASA Astrophysics Data System (ADS)

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

Hu, Hui; Jiang, Hong

2007-12-01

427

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

Microsoft Academic Search

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

Borka Jerman-Blazic

2008-01-01

428

Review of Computer Mediated Communication Research for Education  

ERIC Educational Resources Information Center

|This research review examines recent developments in computer-mediated communication (CMC) research for educational applications. The review draws on 170 recent research articles selected from 78 journals representing a wide range of disciplines. The review focuses on peer-reviewed empirical studies, but is open to a variety of methodologies. The…

Luppicini, Rocci

2007-01-01

429

Privileged Communication in Educational Research: The Case for Statutory Protection.  

ERIC Educational Resources Information Center

Examines the nature of privileged communication in educational research under the laws, and provides guidelines for the development of a scholar's privilege for those engaged in academic research. Two court cases, Cohen v. Cowles Media Co., 1991, and Scare v. United States, 1993, illustrate the potential vulnerability of educational researchers.…

Douvanis, Gus; Brown, John

1995-01-01

430

A maintenance scheme of communication link in mobile robot ad hoc networks based on potential field  

NASA Astrophysics Data System (ADS)

Maintaining communication link in mobile robot networks between task robots and a control center is very important in some urgent application occasions such as remote danger detections. To offer a reliable multi-hop communication link, a link maintaining scheme based on artificial potential field is presented. The scheme is achieved by a task robot and communication relay ones. The task robot performs predefined tasks, and relay ones are simple robots which form a communication relay chain. When robots move towards destination in formation, a kind of attractive force created by communication quality is added to traditional potential field, and relay robots follow the task robot and automatically stop at adequate locations to form a relay chain from the control station to the task robot. In order to increase relay usage efficiency, when some relays are replaced by other short cut relays, the redundant relays can be reused by initiating another moving toward specified location. Simulation results show that the scheme can provide a reliable multi-hop communication link, and that the communication connection can be obtained through minimal number of relays.

Jiang, Hong; Jin, WenPing; Yang, GyoYing; Li, LeiMin

2007-12-01

431

Approaching Mass Media Education Through Communication Research.  

National Technical Information Service (NTIS)

This set of three papers is an account of the Finnish approach to mass media education and to the research orientation which instigated it. 'From Mass Media to Mass Consciousness; Current Thinking in Scandinavia' provides a research orientation, presents ...

Y. Littunen

1974-01-01

432

Laboratory evaluation of a channel-sensitive slotted Aloha access algorithm for land mobile satellite communications  

NASA Astrophysics Data System (ADS)

Land mobile satellite communication is handicapped by fading and shadowing effects in zones with low elevation angles. Slotted Aloha is a relatively simple and attractive random access scheme for such applications, since its performance does not degrade as fast as that of other schemes. A slotted Aloha based modified channel access strategy for highly unreliable channels which requires all mobile stations in a network to estimate the link quality before starting their transmission is presented. This improved slotted Aloha with channel sensing, requiring little more complexity, is analyzed in its dynamics under channel influence with the help of a hybrid evaluation tool. The simulation concept combines software routine and hardware communication devices and includes measured channel data. Results show the improvement of the suggested scheme in comparison to the conventional slotted Aloha.

Boettcher, Axel; Dippold, Michael; Jahn, Axel

1991-10-01

433

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.

434

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

435

CUBESAT-TO-GROUND COMMUNICATION AND MOBILE MODULAR GROUND STATION DEVELOPMENT  

Microsoft Academic Search

A mobile modular ground station is described for direct communication and tracking of CubeSats from various locations. The ground station operates in the UHF range and employs a circularly polarized Yagi-Uda antenna. A two-piece wooden antenna base with a telescoping mast was constructed for mounting the antenna. For an orbit height of 600 km, satellite transmit power of 27.0 dBm,

Dylan Ichikawa

436

Jitter Effect on a Digital IF Transceiver for SDR-based Mobile communication Base Station  

Microsoft Academic Search

This paper outlines the time jitter effect of a sampling clock on a Software Defined Radio (SDR) technology- based-Digital Intermediate Frequency (IF) transceiver for a mobile communication base station. The implemented Digital IF transceiver is reconfigurable to three bandwidth profiles : 1.75 MHz, 3.5 MHz, and 7 MHz each incorporating the IEEE 802.16d Worldwide Interoperability for Microwave Access (WiMAX) standard

Bong-Guk Yu; Gweon-Do Jo; Jin-Up Kim; Sung Woong Ra

2007-01-01

437

A Mobile Communication Base Station Antenna Using a Genetic Algorithm Based Fabry-Pérot Resonance Optimization  

Microsoft Academic Search

We proposed a high-gain wideband resonant-type mobile communication base station antenna using a Fabry-Pérot cavity (FPC) technique. To overcome inherent narrow radiation bandwidth of FPC-type antennas while keeping relatively high gain, we introduced a new superstrate structure composed of square patches and loops, which satisfies an FPC resonance condition at a target frequency region. To do that, we optimized the

Dongho Kim; Jeongho Ju; Jaeick Choi

2012-01-01

438

The future generations of mobile communications based on broadband access technologies  

Microsoft Academic Search

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

Shingo Ohmori; Yasushi Yamao; Nobuo Nakajima

2000-01-01

439

A dedicated mobile communication system with no base station using frequency hopping spread spectrum multiple access  

Microsoft Academic Search

The realization of an FH-SSMA (frequency-hopping spread-spectrum multiple-access) communication system useful for 16 mobile subscribers within an area of 5 miles diameter is considered. The subscriber's information is digitized with the help of a CVSD (continuously variable slope detector) codec at the rate of 16 kb\\/s which is sent through a 4\\/16 orthogonal encoder giving coded data of rate 64

R. G. Madhusudhana

1989-01-01

440

A type of base-station antennas used in MIMO mobile communication systems  

Microsoft Academic Search

MIMO (multiple-input multiple-output) systems have been widely used in the new generation mobile communications because of their large capability, high speed and low code errors. Transmitting and receiving antenna systems are the very important parts of the whole systems. And their designs will directly affect MIMO system's performance. In this paper, a type of printed-dipole antennas is introduced. The theoretical

Jinyan Li; Zaiping Nie; Yan Cheng; Musheng Liang

2006-01-01

441

A flexible and high performance cellular mobile communications system based on Orthogonal Multi-Carrier SSMA  

Microsoft Academic Search

The conventional Direct-Sequence Spread-Spectrum-Multiple-Access (DS-SSMA) system with RAKE-receiver is an interesting approach in mobile communications in order to combat the frequency selectivity of the channel. The main advantages of DS-SSMA are well known, but its capacity is limited by other-user interference. Another interesting SSMA technique that combats the frequency selectivity of the channel and achieves high spectral efficiency is based

K. Fazel; S. Kaiser; M. Schnell

1995-01-01

442

A demonstration HTS base station sub-system for mobile communications  

Microsoft Academic Search

A demonstration sub-system for mobile communications was developed. In this system, a high-temperature superconducting (HTS) microstrip bandpass filter on r-plane sapphire substrate was designed to have a quasi-elliptic function response, which was aimed at covering the whole receive band of DCS 1800 base station, i.e. 1710-1785 MHz. This filter was then integrated with a low noise amplifier (LNA) and a

Hong Li; Yusheng He; Aisheng He; Shunzhou Li; Chunguang Li; Lingwen Yan; Jingtao Liang; Wenxiu Zhu; Yuan Zhou; Jiasheng Hong; M. J. Lancaster

2002-01-01

443

Reduced complexity comb-filters for decimation and interpolation in mobile communications terminals  

Microsoft Academic Search

In mobile communications systems complexity and efficiency are issues of paramount importance. Therefore when implementing integer factor sample-rate conversion, comb-filters-especially cascaded-integrator-comb (CIC) filters-are a good choice of realizing linear-phase filters with low complexity. However, neither the direct implementation of comb-filters as transversal filters nor their implementation as CIC-filters are minimal realizations. Since both, decimators and interpolators are time-variant systems, the

Tim Hentschel; Gerhard Fettweis

1999-01-01

444

Blind array channel division multiple access (AChDMA) for mobile communications  

Microsoft Academic Search

The paper introduces array channel division multiple access (AChDMA), which is a new blind algorithm for advanced SDMA in mobile communications systems. As an SDMA technique, AChDMA increases the system capacity by improving its time and frequency reuse. Being a blind algorithm, it requires no training sequences, previously known directions of arrival, or user codes, AChDMA separates the moving sources

Victor A. N. Barroso; J. M. F. Moura; J. Xavier

1998-01-01

445

Design of a simple antenna for mobile communications in the L-band  

Microsoft Academic Search

It is expected that second-generation mobile-communications in the L-band will be introduced to the market in the immediate future. A cellular system of mini- or micro-cells will be used to relieve the traffic congestion. Similar to the CT-2 system currently used in Hong Kong and Singapore, the new system will encompass thousands or tens of thousands of micro-cells inter-connected by

R. S. K. Wong; E. K. N. Yung

1994-01-01

446

The global footprint of mobile communications: The ecological and economic perspective  

Microsoft Academic Search

This article quantifies the global carbon footprint of mobile communication systems, and discusses its ecological and economic implications. Using up-to-date data and life cycle assessment models, we predict an increase of CO2 equivalent emissions by a factor of three until 2020 compared to 2007, rising from about 86 to 235 Mto CO2e, suggesting a steeper increase than predicted in the

Albrecht Fehske; Gerhard Fettweis; Jens Malmodin; Gergely Biczok

2011-01-01

447

Experiment Plan of ETS8 in Orbit : Mobile Communications and Navigation  

Microsoft Academic Search

The experiment of S-Band Mobile Communications\\/Broadcasting and L\\/S-Band Satellite Navigation is the main objectives of Engineering Test Satellite - 8 (ETS-8), which will be launched in 2004 into geostationary orbit at 146 degree East. In this paper, the basic experiment plan is described. After the function tests of satellite in orbit, participation of those who have interest in this experiment

M. Homma; S. Hama; H. Kohata

2002-01-01

448

Propagation characteristics for wideband outdoor mobile communications at 5.3 GHz  

Microsoft Academic Search

In this paper, empirical channel models and parameters are derived from the wideband measured data at 5.3 GHz in outdoor mobile communications. The path loss exponents and intercepts are obtained by using the least square method. The mean excess delay and mean root-mean-square (rms) delay spread are within 29-102 ns and 22-88 ns, respectively. The correlation distances and bandwidths are

Xiongwen Zhao; Jarmo Kivinen; Pertti Vainikainen; Kari Skog

2002-01-01

449

Use of Dempster-Shafer Theory and Bayesian Inferencing for Fraud Detection in Mobile Communication Networks  

Microsoft Academic Search

This paper introduces a framework for fraud detection in mobile communication networks based on the current as well as past\\u000a behavioral pattern of subscribers. The proposed fraud detection system (FDS) consists of four components, namely, rule-based\\u000a deviation detector, Dempster-Shafer component, call history database and Bayesian learning. In the rule-based component, we\\u000a determine the suspicion level of each incoming call based

Suvasini Panigrahi; Amlan Kundu; Shamik Sural; Arun K. Majumdar

2007-01-01

450

On the development of superconducting microstrip filters for mobile communications applications  

Microsoft Academic Search

This paper presents recent developments of an eight-pole planar high-temperature superconducting (HTS) bandpass filter with a quasi-elliptic function response. A novel planar filter configuration that allows a pair of transmission zeros to be placed at the band edges is described. The miniature HTS filter has a fraction bandwidth less than 1% and is designed for mobile communication base-station applications to

Jia-Sheng Hong; Michael J. Lancaster; Dieter Jedamzik; Robert B. Greed

1999-01-01

451

DSD (Double Soft Decision) Concatenated FEC Scheme in Mobile Satellite Communication Systems  

Microsoft Academic Search

In order to realize a higher-code-gain forward error correction scheme in mobile satellite communication systems, a novel concatenated coding scheme employing soft decision decoding for not only inner codes but also outer codes (double soft decision, or DSD, concatenated forward error correction scheme) is proposed. Soft-decision outer decoding can improve the bit error probability of inner decoded data. In this

Shunji Honda; Shuji Kubota; Shuzo Kato

1992-01-01

452

A 60 GHz Radio-Over-Fiber Network Architecture for Seamless Communication With High Mobility  

Microsoft Academic Search

We demonstrate a 60 GHz broadband picocellular Radio-over-Fiber network architecture that enables seamless connectivity for highly mobile end-users. Its seamless communication capabilities arise by the supported handover scheme that relies on a novel Moving Extended Cell (MEC) concept. MEC exploits user-centric virtual groups of adjacent cells that transmit the same data content to the user and utilizes a switch mechanism

Nikos Pleros; Konstantinos Vyrsokinos; Kostas Tsagkaris; Nikolaos D. Tselikas

2009-01-01

453

Definition of a commercial mobile satellite services network to meet DoD communications needs  

Microsoft Academic Search

Commercial-based satellite networks have the potential to provide cost effective communications support for the Department of Defense (DoD's) less critical needs which include administration, logistics, and other support functions. This paper summarizes the definition of a possible multi-vendor Mobile Satellite Services (MSS) network architecture. A determination is presented as to what degree existing and planned commercial MSS systems could satisfy

K. M. Price; R. G. Leamon

1993-01-01

454

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

455

The Role of Mobile Adcommunication in Business to Business Marketing  

Microsoft Academic Search

Purpose of the paper and literature addressed: Mobile adcommunication allows companies to communicate with their customers directly - anytime and anywhere - via mobile devices. So far, mobile adcommunication has mainly been connected with consumer products. This study broadens the scope of mobile adcommunication research by studying how m-adcommunication can be applied as a part of business-to-business marketing communications. Research

Tiina Takkula; Jaana Tähtinen

456

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.

2011-01-01

457

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

NASA Astrophysics Data System (ADS)

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

Ames, William G.

458

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

NASA Astrophysics Data System (ADS)

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.

1980-07-01

459

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

460

APPLYING COMMUNICATION THEORY TO DIGITAL DIVIDE RESEARCH  

Microsoft Academic Search

Most research on the Digital Divide focuses on recording the presence or absence, closure or widening of gaps in access and usage. Researchers who document trends in Internet usage gaps contribute valuable information to the field, but the binary nature of the arguments often avoids or blocks theoretical progress that could potentially explain the significant consequences of these gaps -

SHANA M. MASON; KENNETH L. HACKER

2003-01-01

461

Challenges and future directions for tailored communication research.  

PubMed

As informatics technology advances, a growing number of research trials on tailored communications provide an accumulation of promising evidence to support their efficacy. These trials also reveal gaps and opportunities for future research. The scope and boundaries of tailoring must be redefined in terms of both new technology and the trade-offs between complexity, demand burden on participants, and the minimal information required for effective and efficient tailoring. Basic and methods research is needed to broaden theory, develop a common language, standardize measures, and isolate the key mediating mechanisms that facilitate tailored communications. Applied research must consider more rigorous research designs for efficacy trials and conduct more effectiveness trials to investigate the mechanisms of technology transfer to enhance large-scale diffusion of tailored communications. The role of contextual variables needs to be examined, as well as their interaction with different population groups, and also the channels, modes, and methods of tailored message delivery. Research is also needed on the feasibility of tailoring across clusters of multiple risk factors to identify the commonalities, differences, and interrelations among diverse behaviors. The potential cost-effectiveness of tailored communications must also be examined. No matter how efficacious, tailored communications delivered to large populations (i.e. mass-customization) will not make a public health impact unless proven to be practical and cost-efficient. PMID:10721436

Abrams, D B; Mills, S; Bulger, D

1999-01-01

462

AMALi - the Airborne Mobile Aerosol Lidar for Arctic research  

Microsoft Academic Search

The Airborne Mobile Aerosol Lidar (AMALi) is an instrument developed at the Alfred Wegener Institute for Polar and Marine Research for a trouble-free operation under the challenging weather conditions at the Earth's polar regions. Since 2003 the AMALi has been successfully deployed for measurements in the ground-based installation and the zenith- or nadir-aiming airborne configurations during several scientific campaigns in

I. S. Stachlewska; R. Neuber; A. Lampert; C. Ritter; G. Wehrle

2009-01-01

463

A Study on the Cell Sectorization Using the Wide-beam and Narrow-beam for CDMA Mobile Communication Systems  

Microsoft Academic Search

Cell sectorization and improvement of the Ec\\/Io are technologies to offer good quality of services (QoS) and coverage for new and sophisticated power control to achieve high capacity in CDMA cellular mobile communication networks. In this paper, in order to efficient cell sector and to improve the Ec\\/Io of the pilot channel in CDMA mobile communication systems, I analyze and

Dong You Choi; Jung Jin Park

2007-01-01

464

The benefits of computer-mediated communication in nursing research.  

PubMed

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

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

2008-08-01

465

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

Code of Federal Regulations, 2010 CFR

...2009-10-01 2009-10-01 false Industrial mobilization; or engineering, development, or research capability...and Open Competition 206.302-3 Industrial mobilization; or engineering, development, or research...

2009-10-01

466

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

467

Empirical Findings and Suggestions for Future Research on Organizational Communication.  

National Technical Information Service (NTIS)

The report is a companion piece to Technical Report No 7 (AD-785 003) from this grant. It reviews the research in organizational communication completed and in progress suggests some directions future research might take, and mentions how the results of t...

K. H. Roberts C. A. O'Reilly

1974-01-01

468

From Research to Policy: Roma Participation through Communicative Organization  

ERIC Educational Resources Information Center

|For centuries, Roma people's social exclusion has been reinforced through research that has legitimized stereotypes rather than helping to overcome them. This has led Roma people to refuse to participate in the kind of research that has contributed to discrimination against them. We describe how the critical communicative methodology, used in the…

Munte, Ariadna; Serradell, Olga; Sorde, Teresa

2011-01-01

469

Mass Communication Research Trends from 1980 to 1999.  

ERIC Educational Resources Information Center

|Uses thematic meta-analysis to examine study method, medium and area of focus, theoretical approach, funding source, and time period covered in research articles published in 10 major mass communications journals during the 1980 to 1999 period. Finds that qualitative research methods continued to be much less common than quantitative methods…

Kamhawi, Rasha; Weaver, David

2003-01-01

470

Ethnography of Communication: A Unique Contribution to Organizational Research.  

ERIC Educational Resources Information Center

|This paper argues that while organizational research includes a diverse array of naturalistic approaches, a gap exists in the organizational literature that can only be filled by the ethnography of communication (EC). The paper proposes that, instead of using speech to do qualitative research, speech itself should be studied as the topic of…

Jabs, Lorelle

471

From Research to Practice: Communications for Social Change  

ERIC Educational Resources Information Center

|What happens when the research inquiry is complete and has determined which reframes will be most successful in improving public understanding of an issue and advancing policy goals? Simple dissemination of research findings is not sufficient to improve the communications capacity of the field. The author explains how cognitive science and social…

Davey, Lynn

2009-01-01

472

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

ERIC Educational Resources Information Center

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

Campbell, Scott W.; Kwak, Nojin

2011-01-01

473

The Mobil Integrated C{sup 3} (command control and communications) and Security System  

SciTech Connect

The current political and economic situations suggest that significant reductions of nuclear forces outside the US will continue. This implies that in times of crisis the rapid deployment of nuclear weapons into a theater may be required. This paper describes a proposed Mobile Integrated C{sup 3} and Security System (MICSS). The MICSS, together with associated personnel, could satisfy the command and control and security requirements of a deployed nuclear operation. Rapid deployment poses unique nuclear weapon surety difficulties that must be overcome for the operation to be effective and survivable. The MICSS must be portable, reliable, limited in size, and easily emplaced to facilitate movement, reduce the possibility of detection, and minimize manpower requirements. The MICSS will be based on existing technology. Sandia has designed prototype mobile command centers for the military. These command centers are based on an approach that stresses modularity, standards, and the use of an open architecture. Radio, telephone, satellite communications, communication security, and global positioning system equipment has been successfully integrated into the command centers. Sandia is also supporting the development of portable security systems for the military. These systems are rapidly deployable and mission flexible and are capable of intrusion detection, area and alarm display, night assessment, and wireless sensor communications. This paper is organized as follows: Background information about the prototype mobile command centers will be presented first. Background information about portable security systems concepts will then be given. Next, an integrated communications and security system will be presented, and finally, the design and status of a prototype MICSS will be described.

Eras, A.; Brown, R.D.

1993-06-15

474

An overview of the OmniTRACS - The first operational two-way mobile Ku-band satellite communications system  

NASA Astrophysics Data System (ADS)

A two-way mobile Ku-band satellite-based communications system is presented, which has a position reporting capability integrated into a mobile terminal, allowing automatic transmission of LORAN-C derived position information. The system and its service capabilities are described, including the mobile satellite terminal and network management facility. The possible applications of the system are outlined, including applications in transportation, vehicle location, public safety, and public utilities.

Jacobs, Irwin M.

1989-12-01

475

The Communication Research Team As Learning Community  

ERIC Educational Resources Information Center

|Colleges and universities have come to recognize that creating smaller learning communities is a useful strategy for engaging undergraduate students. Learning communities can provide students with a sense of identity and with connections to faculty, the institution, and knowledge. Despite their popularity, there is little empirical research that…

Janusik, Laura A.; Wolvin, Andrew D.

2007-01-01

476

Research-Based Communication Tool Kit  

ERIC Educational Resources Information Center

Significant research over the last decade has built a strong case for the value of arts learning. Major summaries, including "Schools, Communities, and the Arts" (1995); "Champions of Change" (2000); "The Arts in Education: Evaluating the Evidence for a Causal Link" (2000); "Critical Links" (2002); and now "Critical Evidence: How the Arts Benefit…

Brown, Sherry; Campbell-Zopf, Mary; Hooper, Jeffrey; Marshall, David; McLaughlin, Beck

2007-01-01

477

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

Microsoft Academic Search

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

JOE R. DOWNING; RUSSELL S. CLARK

2007-01-01

478

[Mobile hospital -real time mobile telehealthcare system with ultrasound and CT van using high-speed satellite communication-].  

PubMed

A real-time telescreening system is developed to detect early diseases for rural area residents using two types of mobile vans with a portable satellite station. The system consists of a satellite communication system with 1.5Mbps of the JCSAT-1B satellite, a spiral CT van, an ultrasound imaging van with two video conference system, a DICOM server and a multicast communication unit. The video image and examination image data are transmitted from the van to hospitals and the university simultaneously. Physician in the hospital observes and interprets exam images from the van and watches the video images of the position of ultrasound transducer on screenee in the van. After the observation images, physician explains a results of the examination by the video conference system. Seventy lung CT screening and 203 ultrasound screening were done from March to June 2002. The trial of this real time screening suggested that rural residents are given better healthcare without visit to the hospital. And it will open the gateway to reduce the medical cost and medical divide between city area and rural area. PMID:12832865

Takizawa, Masaomi; Miyashita, Toyohisa; Murase, Sumio; Kanda, Hirohito; Karaki, Yoshiaki; Yagi, Kazuo; Ohue, Toru

2003-01-01

479

Research on the Advertisement Effect of Push Type Mobile Advertisement  

Microsoft Academic Search

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

Jung woo Lee; Choong sik Lee; Yong suk Park

2009-01-01

480

A feasibility study of a mobile communication network using a constellation of low earth orbit satellites  

NASA Astrophysics Data System (ADS)

An effort was made to study whether the increased survivability, true global coverage, and reduced path loss of a LEO network could be utilized to give a viable mobile communication system. The architecture of such a network is complex, but it is expected that the use of advanced technology can overcome most limitations. An optimum constellation is considered, and the first three layers of a digital network are examined. Under certain simplifying assumptions it is shown that the proposed configuration is viable and compares favorably with a similar geostationary network with regards to the overall space-segment cost. The cost benefit begins to favor the LEONET for simpler spacecraft. It is also noted that it may be possible to scale down the LEO constellation to a smaller size so as to provide continuous coverage above about 70 deg latitude, where geostationary satellites are ineffective. This hybrid architecture is also likely to minimize interference with geostationary satellite systems in the congested mobile bands.

Richharia, M.; Hansel, P. H.; Bousquet, P. W.; O'Donnell, M.

481

Efficient Design of Directive Patch Antennas in Mobile Communications Using Metamaterials  

NASA Astrophysics Data System (ADS)

An efficient approach for designing directive patch antennas using metamaterials is presented. Based on the left-handed-material (LHM) transmission line model, circuit elements L and C of the LHM equivalent circuit model are computed in terms of the prescribed desirable characteristics of directive patch antennas. Formulae to calculate the LHM design parameters from the circuit elements L and C are developed. Design examples for the GSM900 and GSM1800 frequency bands in mobile communications are performed to illustrate validation and efficiency of this design approach.

Wang, Rui; Yuan, Bo; Wang, Gaofeng; Yi, Fan

2007-08-01

482

Modeling human dialogue-the case of group communications in trunked mobile telephony  

NASA Astrophysics Data System (ADS)

In this report we study the dynamics characteristics of conversations among several participants, analyzing trunked mobile telephony databases. We find that the duration of the dialogue sessions deviates systematically from the predictions of Poisson statistics, following probability distributions with either log-normal or power law tail. We propose that such a behavior can be described using the Bouchaud-Mezard (B-M) stochastic model, which suggests that the two probability distributions correspond to different types of human networking in conversations. We discuss the implications of our results in risk assessment in communications.

Xenikos, D. G.

2009-12-01

483

A 3 V MMIC chip set for 1.9 GHz mobile communication systems  

Microsoft Academic Search

A MMIC chip-set for 1.9 GHz mobile communication systems consists of a single-pole double-throw (SPDT) switch, a fully-integrated power amplifier, a low-noise amplifier integrated with an auto-gain-control (AGC) amplifier and an up-converter that is integrated on the same chip with a down-converter. All four chips operate at a 3±0.2 V power supply and are fabricated using an ion-implanted GaAs MESFET

S. Tanaka; E. Hase; A. Nakajima; K. Sugano; T. Fujioka; Y. Imakado; K. Fujiwara; T. Okamoto; Y. Shigeno; K. Sato; I. Arai; M. Yamane; C. Kusano; K. Sakamoto; J. Nakagawa; M. Koya

1995-01-01

484

TCP/IP Performance Evaluations Based on Elevation Angles for Mobile Communications Employing Stratospheric Platform  

NASA Astrophysics Data System (ADS)

This paper describes a proposed propagation estimation method and TCP/IP-based evaluations for mobile communications employing a stratospheric platform. To estimate a wireless channel, a realistic and detailed description of its physical environment must be accurately defined. Therefore, a building distribution model characterizing the physical environment in areas in Japan is presented. The analyses of the propagation estimation method are based on the “ray-tracing” model. The results from the proposed method are derived depending on elevation and azimuth angles. In order to validate our results, comparisons between the proposed method and our previous measurement are made for a typical semi-urban area in Japan. The comparisons show close agreement between the estimation results and the measurement results. Finally and interestingly, we present communication performance evaluations based on TCP/IP protocol by using the results achieved from our channel estimation with semi-analytical and simulation approach.

Kong, Marry; Yorkinov, Otabek; Shimamoto, Shigeru

485

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.

Bravo, Jose; Villarreal, Vladimir; Hervas, Ramon; Urzaiz, Gabriel

2012-01-01

486

WIRELESS ADVERTISING: A STUDY OF MOBILE PHONE USERS  

Microsoft Academic Search

Using a qualitative methodology, this study attempts to provide a general framework of the functions of mobile communication, and to identify the specific preferences of mobile phone users regarding the commercial messages received on their personal devices. Research objectives: (1) To identify the specific characteristics of mobile communication as perceived by mobile users; (2) to define and analyze the functions

Gurau Cãlin

2011-01-01

487

The "New" Rhetoric of Mass Communication Research: A Longer View.  

ERIC Educational Resources Information Center

Concludes that although the new rhetoric may serve as a reminder that communication studies are more than simple effects research, the ferment produced by a highly politicized debate--if it successfully masquerades as scholarly controversy--can become intellectually self-limiting and sterile. (PD)

Lang, Kurt; Lang, Gladys Engel

1983-01-01

488

Testing Equivalence in Communication Research: Theory and Application  

Microsoft Academic Search

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

René Weber; Lucy Popova

2012-01-01

489

Acquisition of interpersonal communication skills: A research-based approach  

Microsoft Academic Search

Today's work environment requires increasing competence in interpersonal communication skills. Behavior modeling is the most effective training method for acquisition of these skills. This paper describes the behavior modeling approach and summarizes research on the effectiveness of behavior modeling training and its impact on organizational performance. Recent enhancements to behavior modeling are also reviewed. Behavior modeling's effectiveness lies in its

Karen L. Medsker; John P. Fry

1997-01-01

490

Writing your first successful grant application to conduct communication research  

Microsoft Academic Search

Advice is offered to help scholars write successful communication grant applications, including practical issues such as learning about opportunities, finding the time to write, planning personnel, budgeting, negotiating internal resources, institutional review boards, and deliverables. Additional tips are offered on theoretically rich research with socially meaningful applied outcomes, counterintuitive mechanisms and outcomes, simplicity, detail orientation, demonstrating expertise in the content

Leslie Snyder; Beth Le Poire

2002-01-01

491

Critical Communicative Methodology: Including Vulnerable Voices in Research through Dialogue  

ERIC Educational Resources Information Center

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

Puigvert, Lidia; Christou, Miranda; Holford, John

2012-01-01

492

Transforming Violent Selves through Reflection in Critical Communicative Research  

ERIC Educational Resources Information Center

|Currently, teenagers are being socialized into a world of violent realities, not only through social interaction but also through interaction via the media, especially via the Internet. Research conducted using the critical communicative methodology has shown that this methodology helps young people to reflect critically about their violent…

Flecha, Ainhoa; Pulido, Cristina; Christou, Miranda

2011-01-01

493

Scandinavian Mass Communication Research: Publications in English, French and German.  

ERIC Educational Resources Information Center

This update to the bibliographies from Nordicom edited in 1975 and 1976 lists publications on mass communications research from Denmark, Finland, and Norway, that have appeared in one or more of the three languages--English, French, or German. Materials are listed for each country separately, arranged by author (or title if there is no author),…

Nordic Documentation Center for Mass Communication Research, Aarhus (Denmark).

494

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

495

Participation-Observation Technique lN Organizational Communication Research  

Microsoft Academic Search

One of the most useful tools for studying organizational communication is the participant-observation technique. Using this research technique, the investigator has the capability of gaining information that may not be readily uncovered using other methods. The advantages and disadvantages of the participant-observation technique are discussed in this article.

Mark Hickson

1974-01-01

496

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

497

Technologies for Learning? An Actor-Network Theory Critique of "Affordances" in Research on Mobile Learning  

ERIC Educational Resources Information Center

|How is the link between learner and technology made in mobile learning? What is the value of the concept of "affordances"? And how does research articulating this concept act to position mobile devices as "technologies for learning"? This literature review used both unstructured and structured search samples of published research on mobile

Wright, Steve; Parchoma, Gale

2011-01-01

498

The Vienna LTE simulators - Enabling reproducibility in wireless communications research  

Microsoft Academic Search

In this article, we introduce MATLAB-based link and system level simulation environments for UMTS Long-Term Evolution (LTE).\\u000a The source codes of both simulators are available under an academic non-commercial use license, allowing researchers full\\u000a access to standard-compliant simulation environments. Owing to the open source availability, the simulators enable reproducible\\u000a research in wireless communications and comparison of novel algorithms. In this

Christian Mehlführer; Josep Colom Colom Ikuno; Michal Šimko; Stefan Schwarz; Martin Wrulich; Markus Rupp

2011-01-01

499

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

Microsoft Academic Search

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

Nicola Döring; Sandra Pöschl

2006-01-01

500

Research Participation Among Older Adults With Mobility Limitation  

PubMed Central

The purpose of this qualitative descriptive study was to examine reasons for participation in clinical research among older adults with mobility limitation. A purposive sample of 20 men and 20 women aged 70 years or older was recruited. Data were collected by audiotaped telephone interviews using a semi-structured interview guide and transcribed verbatim. Participants expect privacy, professionalism by research staff, and respectful treatment. Benefits to protocol adherence include personal education, comparison of their health status with that of others, opportunity to maintain vitality, and altruism. Barriers to protocol adherence are apprehension, in particular a negative impact on their health care, randomization to the control group, and experimental drugs; and inconvenience. Factors promoting study completion are obligation, reciprocity, receipt of test results, health promotion, and socialization. Implications include meeting expectations, providing health education and study results to participants, reducing barriers to participation, and presenting opportunities for interaction with others.

Schlenk, Elizabeth A.; Ross, Diana; Stilley, Carol S.; Dunbar-Jacob, Jacqueline; Olshansky, Ellen

2010-01-01