two disadvantages of using wireless networks

... 64 dropped out because of technical problems in terms of the speed of the network and the reliability of the software. Another challenge to the use and implementation of computer- assisted ... Advantages and disadvantages of using computer network technology in language teaching Vu Tuong Vi (*) (*) MA., Department of English-American Language and Culture, College of Foreign Languages ... investigate both advantages and disadvantages of incorporating such technology in language courses. The computer network has offered language teachers and learners a source of authentic materials,...

Ngày tải lên: 05/03/2014, 12:20

... conferences 0 10 20 30 40 50 60 70 80 ICADL 1998 ICADL 1999 ICADL 2000 ICADL 2001 ICADL 2002 ICADL 2003 # of Papers # of Papers from Asia Figure 1. Number of papers accepted in ICADL ICADL 1998 ICADL 1999 ICADL 2000 ICADL 2001 ICADL 2002 # of Papers 23 18 37 34 54 # of Papers ... 14 26 25+ 31+ # of Countries 7 7 12 12 20 # of Countries from Asi a 6 5 7 9 12 # of Institutions 17+ 14+ 31+ 33+ 55+ # of Institutions from Asia 12+ 10+ 21+ 22+ 23+ # of Academic Departments/Discipline s ... coherent view of the collection of data and a sensible set of services, there is a need for remote access mechanisms for digital library services. The simplest of these is the concept of remote searching,...

Ngày tải lên: 01/06/2014, 00:46

Ngày tải lên: 22/06/2014, 19:20

Ngày tải lên: 21/06/2014, 23:20

Ngày tải lên: 22/06/2014, 19:20

... ii Radio Link Performance of Third Generation (3G) Technologies For Wireless Networks Gustavo Nader (Abstract) Third generation wireless mobile communication networks are characterized ... Introduction 1.1 The Need for Third-Generation Wireless Technologies The first generation of wireless networks was primarily concerned with the provision of voice services, allowing users to transition ... One source of co-channel interference, de-correlated in time with 0 frequency offset. One source of adjacent channel interference, de-correlated in time with 200 kHz of frequency offset. One...

Ngày tải lên: 26/04/2013, 11:15

... for wireless telecommunication companies. This chapter overviews several economic aspects of wireless networks, including economic benefits of wireless networks, facts that affect the economics of ... irrespective of the time he spends using the network services. However, most of the time this fee also includes some Economics of Wireless Networks 393 approach appeared; that of ‘prepaid’ time. ... for the demand of wireless data. Section 14.5 discusses charging issues [2] for wireless networks. Finally, Section 14.6 presents a summary. 14.2 Economic Benefits of Wireless Networks Due to their...

Ngày tải lên: 29/09/2013, 21:20

Ngày tải lên: 18/10/2013, 12:15

... services. Operations: The Custodians of Evolving Networks Wireless networks are in constant change. Reconfiguring circuits. Adding cards, elements, and circuits. Upgrading software and hardware. Integrating ... instead of Designing for Profitability Supplier Customer(s) Vendors (i.e., ADC) • Network Planning • Network Operations • Subscribers Network Planning • Network Operations ã Subscribers Network ... maintenance and troubleshooting of a steadily growing network infrastructure. Clearly, the physical layer of the wireless network is getting larger and more complex. With more wireless data services...

Ngày tải lên: 21/12/2013, 08:17

... seskar}@winlab.rutgers.edu Abstract Wireless networks are being integrated into the modern automobile. The security and privacy implications of such in-car networks, however, have are not well ... unlikely to have two cars that would be falsely mistaken for each other. 4 Feasibility of Eavesdropping A critical question for evaluating privacy implications of in-car wireless networks is whether ... in-depth study on the security and privacy of TPMS. One related area of research is location privacy in wireless networks, which has attracted much attention since wireless devices are known to present...

Ngày tải lên: 23/03/2014, 10:20

... security and are often used in security-related discussions, in the context of computer networks. The basic security needs of wireless ad hoc networks are more or less the same as those of wired networks. ... schemes of the wire-line networks have been developed and implemented in wireless cellular networks. To make ad hoc networks secure, we need to find ways to incorporate some of these schemes of wireless ... Focusing on practical potential solutions, this text covers security and quality of service in ad hoc wireless networks. Starting with a review of the basic principles of ad hoc wireless networking, coverage...

Ngày tải lên: 25/03/2014, 12:07

... congestion control of ATM networks have been published. A survey is given in [5]. 3.2. Fuzzy logic implementation A wireless networks is a large distributed complex system with difficulty of highly ... The demand of transmission of images and video is increasing quickly recently and researchers are trying to invest good solutions to improve the quality of these over wireless networks. There ... Journal of Science, Mathematics - Physics 23 (2007) 55-62 55 Congestion control of Wavelet image compression over wireless networks Ho Anh Tuy 1 , Nguyen Vinh An 2,* 1 Hanoi University of...

Ngày tải lên: 28/03/2014, 13:20

... to as mobile ad hoc networks (MANETs) [33] or as infrastructure-less wireless networks. 1.2 Mobile Ad Hoc Networks A Mobile Ad hoc NETwork (MANET) is a system of wireless mobile nodes ... hoc wireless networks. The first part of this chapter presents the taxonomy of single-hop wireless technologies. Specifically, we introduce the concept of Body, Personal, and Local wireless networks, ... and Local Ad Hoc Wireless Networks A bstract 1.1 Introduction 1.2 Mobile Ad Hoc Networks B ody Area Network ã Personal Area Network ã Wireless Local Area Network 1.3 Technologies...

Ngày tải lên: 03/06/2014, 01:08

... transmission using 2DH1&2DM 1 packets over a correlated Rayleigh fading channel at SNR = 15 dB with different 1 Performance of the audio signals transmission over wireless networks with ... h.kazemian@londonmet.ac.uk Abstract This article studies a vital issue in wireless communications, which is the transmission of audio signals over wireless networks. It presents a novel interleaver scheme for protection ... received audio signal. It improves the amount of the throughput over the wireless link through the packet loss reduction. Keywords: wireless networks; Bluetooth; fading channels; interleaving...

Ngày tải lên: 20/06/2014, 20:20

... of packets to various applica- tions. In wireless networks, packets are transmitting with the presence of wireless links. When TCP operates in wireless networks, t he end-to-end performance of TCP ... number of contention of nodes. Moreover, in wireless networks, the interferences between neighboring nodes are much higher compared to local area networks. As a result, the bit error rates of wireless ... improve the performance of TCP over wireless networks. To address this issue, we propose a unified solution called TCP NCE for improving the performance of TCP over wireless networks by reducing the...

Ngày tải lên: 21/06/2014, 02:20

... of different mobility models on connectivity probability of a wireless ad hoc network,” in Proceedings of the International Workshop on Wireless Ad-Hoc Networks, pp. 120–124, June 2004. [5] F. Bai, N. ... multi-hop wireless ad hoc networks, ” in Ad Hoc Networking, pp. 139–172, Addison- Wesley, Reading, Mass, USA, 2001. [3] T. Camp, J. Boleng, and V. Davies, “A survey of mobility mod- els for ad hoc network ... integrated mobility and traffic model for vehicular wireless networks, ” in Proceed- ings of the 2nd ACM International Workshop on Vehicular Ad Hoc Networks (VANET ’05), pp. 69–78, September 2005. [7]...

Ngày tải lên: 21/06/2014, 11:20

... particular class of wireless networks, where there is no self-interference problem (i.e., for which A =∅). In such networks, the set of nodes can be divided into two distinct subsets, the set of transmitting ... receiver node of any link in the case of the tandem multihop wireless network (Figure 4)is smaller on average to that of the multihop wireless network (Figure 6) (Note that any receiver node of the ... in terms of network layer performance metrics as well. Roughly speaking, relation (12) suggests that in networks where the nodes are located far apart (e.g., cellular type of wireless networks) ,...

Ngày tải lên: 21/06/2014, 11:20

... static sensor networks. In this paper, we study data-centric storage in mobile wireless networks. To detect mobility of wireless nodes, [11] used received signal strength in wireless LAN to detect wireless ... deal with static wireless networks. However, with the increasing deployment of wireless devices, there are emerging pervasive applications that rely on the mobility of wireless device. Two representative ... neighborhood of the collector node in a mobile wireless network environment. We propose runtime update of the near likely node in PARIS. Usually in wireless networks each node keeps a list of its neighbors...

Ngày tải lên: 21/06/2014, 18:20

... is the transmission of audio signals over wireless networks. It presents a novel interleaver scheme for protection against error bursts and reduction the packet loss of the audio signals. ... received audio signal. It improves the amount of the throughput over the wireless link through the packet loss reduction. Keywords: wireless networks; Bluetooth; fading channels; interleaving ... DH 1 packets, each one of these packets contains 30 bytes. The duration of this file is 4 s. Number of packets (file-1) = 32 kbytes/30 bytes ≈ 1066 packets. Number of audio portions (file-1)...

Ngày tải lên: 21/06/2014, 20:20

Ngày tải lên: 21/06/2014, 22:20