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Coverage and Connectivity Improvement Algorithms for the Wireless Sensor Networks
Get PDFIn this paper we study the increase of coverage and connectivity in a sensor network with a view to improving coverage, while preserving the network’s coverage. We also examine the impact of on the related problem of coverage-boundary detection. We reduce both problems to the computation of Voronoi diagrams and intersectional point method prove and achieve lower bounds on the solution of these problems and present efficient distributed algorithms for computing and maintaining solutions in cases of sensor failures or insertion of new sensors. We prove the correctness and termination properties of our distributed algorithms, and analytically characterize the time complexity and the traffic generated by our algorithms. Our algorithms show that the increase coverage & Connectivity in wireless sensor density
Analysis and Performance Evaluation of IEEE 802.11 WLAN
Get PDFWith fast deployment of wireless local area networks VoIP over IEEE 802.11 wireless local area network (WLAN) is growing very fast and is providing a cost effective alternative for voice communications. WLANs were initially set up to handle bursty nonreal time type of data traffic. Therefore, the wireless access protocols initially defined are not suitable for voice traffic. Subsequently, updates in the standard have been made to provision for QoS requirements of data, especially the real time traffic of the type voice and video. Despite these updates, however, transmitting voice traffic over WLAN does not utilize the available bandwidth (BW) efficiently, and the number of simultaneous calls supported in practice is significantly lower than what the BW figures would suggest. Several modifications have been proposed to improve the call capacity, and recently isochronous coordination function (ICF) was introduced to mitigate the problem of low call capacity. The proposed modified ICF which further improves the performance in terms of the call capacity. The proposed scheme uses multiplexing and multicasting in the downlink to substantially increase the call capacity
Effect of III-Pass on Microstructure, Micro Hardness and Static Immersion Corrosion Resistance of AA6061-T6/SiCp Surface Composite Fabricated by Friction Stir Processing
Get PDFIn this current investigation, SiC particles 20μm in average size were incorporated into the commercially AA6061-T6 to prepare surface composite by using Friction stir processing (FSP). The morphology of the reinforcement inside the Al matrix has been evaluated from scanning electron microscope (SEM) and the corrosion characteristics of the resulted composite were evaluated using static immersion corrosion (SIC) behavior in 3.5% NaCl aqueous solution at various regimes. From the results, it observed that the SiC particles were distributed uniformly inside the stir zone (SZ) in both first and third-pass of FSP. The micro hardness of stir zone with SiC particles of I-pass was higher compared to III-pass and as-received Al alloy. In static immersion corrosion test the FSP AA6061-T6/SiCp exhibited significantly greater corrosion resistance in I-pass than compared to the III-pass and as-received Al alloy
Efficient Algorithm for Auto Correction Using n-gram Indexing
Get PDFAuto correction functionality is very popular in search portals. Its principal purpose is to correct common spelling or typing errors, saving time for the user. However, when there are millions of strings in a dictionary, it takes considerable amount of time to find the nearest matching string. Various approaches have been proposed for efficiently implementing auto correction functionality. All of these approaches focus on using suitable data structure and few heuristics to solve the problems. Here, we propose a new idea which eliminates the need for calculating edit distance with each string in the dictionary. It uses the concept of Ngram based indexing and hashing to filter out irrelevant strings from dictionary. Experiments suggest that proposed algorithm provides both efficient and accurate results
Syncing and Integrating Windows and Mac OS in the Solitary Macintel, Power PC and x86 Intel Environments
Get PDFWindows users claim that Mac users are conceited, citing that old computer for the rest of us advertising while Mac users claim the same about Windows users. The truth of the matter is that both are about the same. All they are nothing but the different OS GUIs; slightly different ways of opening applications. Once the application is open, the only differences might be whether you use a single button mouse or a multi-button mouse, and even that difference vanishes with third party hardware. First of all, we\u27ll look at some pros and cons for each, then we\u27ll dispel some myths perpetuated about both platforms. Remember both Microsoft and Apple share a good deal of technology. Both Windows and Mac OS use hundreds of patents shared between the two. Also remember that Microsoft makes a lot of software for the Mac including Microsoft Office which was created by a separate department for the Mac. So our concept here is to get the user access to both Mac OS and Windows OS on a single system. It must be done in such a way that it is applicable to both mac Intel and x86 based pc. This can be done with the help of third party applications in which few of them are even legally recognized by Microsoft and Apple. This paper deals with enabling PC for fun, Mac for work in a single system
A New Ultra Low-Power and Noise Tolerant Circuit Technique for CMOS Domino Logic
Get PDFDynamic logic style is used in high performance circuit design because of its fast speed and less transistors requirement as compared to CMOS logic style. But it is not widely accepted for all types of circuit implementations due to its less noise tolerance and charge sharing problems. A small noise at the input of the dynamic logic can change the desired output. Domino logic uses one static CMOS inverter at the output of dynamic node which is more noise immune and consuming very less power as compared to other proposed circuit. In this paper we have proposed a novel circuit for domino logic which has less noise at the output node and has very less power-delay product (PDP) as compared to previous reported articles. Low PDP is achieved by using semi-dynamic logic buffer and also reducing leakage current when PDN is not conducting
Design of Remote I/O data acquisition system with zigbee
Get PDFIn the field of modern wireless communication, There are mainly some technologies that provide solutions to the wireless data transmission network, such as: GSM, CDMA, 3 G, Wi-Fi. These solutions make network work with high efficiency and good quality, but still with high Cost. So it was difficulty in popularizing in with low cost and at the circumstance of infrastureless or Infrastructure destruction. According to this situation, in This paper, the key components of the Information Terminal and the wireless receiving modules on the data Collection and wireless transmission network were Designed with the principle of zigbee and 51 Series of single-chip computer as the core hardware, Besides, combining with the current technology on the Wireless Ad Hoc Networks, a short-rang wireless data Sampling and transmission network was putting up, Which provides a low-powered and high-performance? Wireless data communication system, works in the ISM (Industrial Scientific Medical) Band. Then, an available Solution to the wireless data communications was put forward, and this solution was good at stronger real-time Response, higher reliability requirement and smaller data Amount. Through software and hardware debugging and Actual measuring, this system based on our solution had Work well, reached the expected goal and been already successfully applied to Wireless vehicle System
Renewable and Non-Conventional Energy Sources and Engineering System
Get PDFEnergy is the gift of nature to man kind in various forms. Energy is the need for all kinds of work done by human being and nature. There are many sources of energy that help to run the various machines invented by man. But as the population and development activities increases, the requirement of the energy (demand) will also increase. If this trend of continuous exploitation of energy sources, continue the sources are going to be exhausted very soon n near future. So we need to look for the alternative of conventional sources of energy and the best alternative of conventional energy sources are the non-conventional energy sources of energy which are also called renewable source of energy. The conventional source of energy are coal, petroleum, natural gas, etc. which are kind of fossil fuel and non-conventional are renewable sources of energy ar in the form of solar, wind, geothermal, biomass, ocean thermal, hydro and Tidal energy. Sun is the main source of energy