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Communication Environment (communication + environment)

Distribution by Scientific Domains
Engineering66%
Humanities and Social Sciences33%

Selected Abstracts

Using Computer-Mediated Communication (CMC) in Language Teaching

DIE UNTERRICHTSPRAXIS/TEACHING GERMAN, Issue 1 2009
Senta Goertler
This article discusses how new and familiar computer technology tools can be used in a communicative language classroom. It begins by outlining the benefits and challenges of using such technology for language teaching in general, and it describes some sample activities that the author has used. Readers are shown how to implement various computer tools in their own classrooms in order to create a Computer-Mediated Communication environment in a communicative language classroom. [source]

A zone co-operation approach for efficient caching in mobile ad hoc networks

INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS, Issue 9 2006
Narottam Chand
Abstract Mobile Ad hoc NETwork (MANET) presents a constrained communication environment due to fundamental limitations of client resources, insufficient wireless bandwidth and users' frequent mobility. Caching of frequently accessed data in such environment is a potential technique that can improve the data access performance and availability. Co-operative caching, which allows the sharing and co-ordination of cached data among clients, can further explore the potential of the caching techniques. In this paper, we propose a novel scheme, called zone co-operative (ZC) for caching in MANETs. In ZC scheme, one-hop neighbours of a mobile client form a co-operative cache zone. For a data miss in the local cache, each client first searches the data in its zone before forwarding the request to the next client that lies along routing path towards server. As a part of cache management, cache admission control and value -based replacement policy are developed to improve the data accessibility and reduce the local cache miss ratio. An analytical study of ZC based on data popularity, node density and transmission range is also performed. Simulation experiments show that the ZC caching mechanism achieves significant improvements in cache hit ratio and average query latency in comparison with other caching strategies. Copyright © 2006 John Wiley & Sons, Ltd. [source]

An experimental study on improving of the wireless LAN communication environment using a plaster board-type wave absorber

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 1 2006
Kenjiro Otsuka
Abstract In this paper, after setting up easy-to-install plaster board-type wave absorbers in a model room (assuming a wireless LAN environment), transfer rates are measured using a wireless communication system conforming to IEEE 802.11a (5.2-GHz band) and IEEE 802.11g (2.45-GHz band) and improvements in transfer rates are inspected. The results of the experiment confirm that, compared to the status prior to installation of the wave absorbers, improvements of roughly 7.4% upstream and 10.8% downstream in the case of 11a, and roughly 116.7% upstream and 57% downstream improvements in the case of 11g, are obtained. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 107,108, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21277 [source]

Signal enhancement in multiuser communication through adaptivity on transmit

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 4 2003
Abdellatif Medouri
Abstract This paper presents a technique to enhance the received signals in a multiuser communication environment through the use of adaptivity on transmit. This technique is based on the principle of reciprocity and is independent of the material medium of transmission and the near-field environments. The objective here is to select a set of weights to be applied to each transmitting antenna, which is a function of the user location. The methodology is not a function of the multipath environment. Furthermore, the transmitted signal may be directed to a particular receiver location and simultaneously be minimized at other receiver locations while operating on the same frequency. Numerical simulations have been made to illustrate the novelty of the proposed approach. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 265,269, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11034 [source]

Improving the coordination efficiency of limited-communication multi,autonomus underwater vehicle operations using a multiagent architecture

JOURNAL OF FIELD ROBOTICS (FORMERLY JOURNAL OF ROBOTIC SYSTEMS), Issue 4 2010
Christopher C. Sotzing
This research addresses the problem of coordinating multiple autonomous underwater vehicle (AUV) operations. An intelligent mission executive has been created that uses multiagent technology to control and coordinate multiple AUVs in communication-deficient environments. By incorporating real-time vehicle prediction, blackboard-based hierarchical mission plans, mission optimization, and a distributed multiagent,based paradigm in conjunction with a simple broadcast communication system, this research aims to handle the limitations inherent in underwater operations, namely poor communication, and intelligently control multiple vehicles. In this research, efficiency is evaluated and then compared to the current state of the art in multiple AUV control. The research is then validated in real AUV coordination trials. Results will show that compared to the state of the art, the control system developed and implemented in this research coordinates multiple vehicles more efficiently and is able to function in a range of poor communication environments. These findings are supported by in-water validation trials with heterogeneous AUVs. © 2010 Wiley Periodicals, Inc. [source]

Public Diplomacy in Grand Strategy

FOREIGN POLICY ANALYSIS, Issue 2 2006
BEN D. MOR
Despite the growing importance of public diplomacy in current international politics, its practice,and particularly its relationship with hard power,remains largely unexplored by diplomatic or strategic theory. This paper applies a grand-strategic perspective to analyze the challenges of "winning hearts and minds" in the new communications and normative environments. Israel's experience in the second Intifada serves to draw empirically based lessons on the grand-strategic relationship between propaganda and counterterrorist operations. This relationship, the case study shows, is shaped by the close proximity of tactical-level events to the "surface" of grand strategy, to which their effects tend quickly to rise in the new communications environment. In this context, the proactive role of public diplomacy becomes a key to grand-strategic success. [source]