DISADVANTAGES OF USING WIRELESS SENSOR NETWORKS

Very recently, Zhou et al. investigate the decentralized collaborative target tracking problem in a WSN from the fusion of quantized innovations perspective (Zhou et al., 2009c). A hierarchical fusion structure with feedback from the FC to each deployed sensor is propos[r]

3.2.1. Scenario I—high mobility
The mobility parameters in config.in Glomosim file were changed to simulate high-mobility scenarios. The mobility model used was a random waypoint mobility model, the maximum node speed was set to 10 m/s, and minimum node speed was zero with a zero pause time. As in[r]

(b) Field 2
Fig. 12. Two simulation scenarios by using sensor node arrays with different distances.
6. Conclusions
A wireless network physiological signal and field signal monitoring systems in homecare technology and precision agriculture were proposed in[r]

ðể cung c ấ p s ự ho ạ t ñộ ng cho các node, ph ầ n quan tr ọ ng là các h ệ ñ i ề u hành ngu ồ n m ở ñượ c thi ế t k ế ñặ c bi ệ t cho WSNs. Thông th ườ ng, các h ệ ñ i ề u hành nh ư th ế dùng ki ế n trúc d ự a trên thành ph ầ n ñể
có th ể thi ế t l ậ p m ộ t cách nhanh chóng trong khi kích[r]

1. Introduction
Spinal cord injury (SCI) is one of the most complex and devastating medical conditions. Its worldwide incidence ranges from 11 to 112 per 100,000 Population (Blumer & Quine, 1995; DeVivo, 1997). SCI leads to different degrees of dysfunction of the lower u[r]

.41 TRANG 16 _An Introduction to Wireless Mesh Networks_ 5 Internet Internet Mesh router Client node Wireless link Gateway Cellular network Sensor network WLAN PDA Edge router Edge route[r]

F. Distributed Monitoring based clustering architecture
Clustering facilitates the distribution of control over the network. Clustering saves energy and reduces network contention by enabling locality of communication.
In our case, sensor networks are divided into[r]

Fig 1.1 The position of the wireless sensor.
In this book chapter we will first present the issues of having wireless sensor nodes in train environments. We will also present wave propagation theory to explain why there is a need to introduce divers[r]

A major WSN challenge lies in maximizing network coverage area. Given that many of the “off-the-shelf" sensor node platforms operate using low power wireless sensor technologies, transmission range is extremely limited, especially in the indoor environment. A[r]

automatic assignment method. However, this would require extensions to the network protocols and thus increase network complexity and protocol overheads.
† Market-based reservation charging. This method entails an auctioning procedure for acquiring network resources. Users place monetary bids an[r]

Health: One area which is already showing such signs of applications of ubiquitous
computing is health monitoring. Emerging developments in this area are providing the means for people to increase their level of care and independence with specific appli[r]

Không giống các giao thức phân chia cốựịnh, dung lượng kênh truyền ựược chia ựộc quyền cho một node nào ựó mà không cần xác ựịnh trước nhu cầu thông tin hiện tại của node.. Giao thức phâ[r]

(WLAN)/hotspots, broadband wireless access (BWA)/Wimax, và 3G.
4.1 Quá trình truy ề n sóng :
Truy ề n sóng radio dùng trong m ạ ng WSN th ườ ng d ướ i d ạ ng tr ự c ti ế p hay không gian t ự do. Sóng phát ra t ừ ngu ồ n, ñ i theo t ấ t c ả các h ướ ng theo ñườ ng th ẳ ng, n ă ng l ư[r]

In this chapter, we have discussed how enabling compression helps in wireless sensor nodes. First, we have briefly introduced LEC, a lossless compression algorithm we proposed in a previous paper. LEC divides the alphabet of differences between consecutive samples[r]

Most of the duty cycle MAC protocols are designed for non-cooperative Single-Out Single- In (SISO) schemes. Polastre in 2004 introduces B-MAC or Berkeley MAC (Polastre et al., 2004). The protocol is a variant of Carrier Sense Multiple Access (CSMA) with a preamble sampli[r]

organizations can take to make it more difficult to locate their wireless access points. The easiest and least costly include the following: Turning offthe service set identifier (SSID) broadcasting by wireless access points, Assign cryptic names to SSIDs, Reducing signal strength[r]

(a) Frame’s size calculation (b) Distribute time slot allocation
Fig. 8. Time slot allocation based on a tree structure
In other versions of the problem the scheduling solution must satisfy certain requirements such as connectivity, data rates and delay. Kedad et al. (2010) formulate th[r]

There is a common problem in energy efficiency considerations in wireless sensor networks (WSNs): maximizing the amount of data sent from all sensor nodes to the base station (BS) unti[r]

Network lifetime has become the key characteristic for evaluating sensor networks in an application-specific way. Especially the availability of nodes, the sensor coverage, and the con- nectivity have been included in discussions on network lifetime. Even quality of