Abstract-Topology control in wireless sensor networks tries to improve the performance by reducing transmission power and by confining interference, collisions and consequently retransmissions. Network performance is assessed using LQI, RSSI, BER etc. LQI a metric introduced in IEEE802.15.4 that measure the error in incoming modulation of successfully received packets [1]. In this paper, we analyze popular topology control algorithms w.r.t weak link BER and propose a novel technique to optimize BER with additional relay nodes. We introduce additional relay nodes to make the network connected instead of increasing the power. Thus it also results in saving energy.We have also evaluated the algorithm combining with LIFE, GG and RNG algorithms and demonstrated its superiority in giving high quality network.
Abstract-Node clustering and data aggregation are popular techniques to reduce energy consumption in large Wireless Sensor Networks (WSN). Cluster based routing is always a hot research area in wireless sensor networks. Classical LEACH protocol has many advantages in energy efficiency, data aggregation and so on. However, determining number of clusters present in a network is an important problem. Conventional clustering techniques generally assume this parameter to be user supplied. There exist very few techniques that can solve the problem of automatic detection of number of clusters satisfactorily. Some of these techniques rely on user supplied information, while others use cluster validity indices. In this paper, we proposed a rather simple method to identify the number of clusters that can give satisfactory results. Proposed method is compared with classical LEACH protocol and found to be giving better results.
Attempted deoxygenation of diaryl‐substituted propargyl alcohols according to A) unexpectedly results in a tandem isomerization/reduction followed by intramolecular Friedel—Crafts‐type cyclization to produce indene derivatives An exclusive formation of vinyl iodides (X) is observed if the propargylic alcohol moiety bears an alkyl group.
In recent years, the Mobile Wireless Sensor Network is the emerging solution for monitoring of a specified region of interest. Several anomalies can occur in WSNs that impair their desired functionalities resulting in the formation of different kinds of holes, namely: coverage holes, routing holes. Our ultimate aim is to cover total area without coverage hole in wireless sensor networks. We propose a comprehensive solution, called holes detection and healing. We divided our proposed work into two phases. The first phase consists of three sub-tasks; Hole-identification, Hole-discovery and border detection. The second phase treats the Hole-healing with novel concept, hole healing area. It consists of two sub-tasks; Hole healing area determination and node relocation.
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