IMPACT : International Journal of Research in Engineering & Technology

11-22

Authors: STELLA ANTONY K & SHIJI C. G

Social network applications are becoming increasingly popular on mobile devices. A mobile presence service is an essential component of a social network application because it maintains each mobile user’s presence information, such as the current status (online/offline), GPS location and network address, and also updates the user’s online friends with the information continually. If presence updates occur frequently, the enormous number of messages distributed by presence servers may lead to a scalability problem in a large-scale mobile presence service. To address the problem, we propose an efficient and scalable server architecture, called PresenceCloud, which enables mobile presence services to support large-scale social network applications. When a mobile user joins a network, PresenceCloud searches for the presence of his/her friends and notifies them of his/her arrival. PresenceCloud organizes presence servers into a quorum-based server-to-server architecture for efficient presence searching. It also leverages a directed search algorithm and a one-hop caching strategy to achieve small constant search latency. We analyze the performance of PresenceCloud in terms of the search cost and search satisfaction level. The search cost is defined as the total number of messages generated by the presence server when a user arrives; and search satisfaction level is defined as the time it takes to search for the arriving user’s friend list. The results of simulations demonstrate that PresenceCloud achieves performance gains in the search cost without compromising search satisfaction.

33-44

Authors: RAVI MATHEY & P. S. AVADHANI

There has been a serious trend to convert conventional analog images to digitized images. The volume of digitized image being very high, will considerably slowdown the transmission and storage of such images. Therefore there is strong need of compression of the images by extracting the visible elements which are encoded and transmitted. This will substantially reduce the quantity of data to be stored and transmitted. Compression can be achieved by transforming the data and projecting it on the basis of functions and then encoding the transform. Wavelet coding has received considerable attention for image compression applications because it can hierarchically decompose an input image into a series of successfully low resolution approximation images and their associated detailed images at each level. When an image is subjected to n-level decomposition using DWT (Discrete Wavelet Transforms), the nth level will correspond to the lowest frequency sub-band and to the lowest resolution. When an image is decomposed using wavelet transforms one will get approximation and detailed images.we propose the EZW and SPIHT coding and ARQ (Automatic retransmission request) and FEC (Forward error correction) techniques and finally PZW (Packetizable Zero Tree Wavelet) coding techniques by modifying the EZW/SPIHT coding algorithms.

53-60

Authors: DESHANT & RAHUL JOHARI

In today’s world of technology, security for systems/restricted places has become a challenging task. Authentication plays a major role for any security system where access can be given to only authorized persons. Authentication is the process of giving someone the identity so that he or she can access that particular application or data. It is like confirming something what it claims to be something like we are showing our ID proof to get access in the particular area restricted to particular persons only. In today’s world of data/password hacking, biometric systems are emerging fastly to fulfill or to meet the requirements of securing the data or to avoid the unauthorized identities to hack/access the data/control. Objective of the authentication technique using Face detection is to provide and to ensure the full proof security of the information or the data we are sharing by the mean of processing & comparing the unique structure of the face of the person to authenticate him.

67-76

Authors: ANSHUL SHARMA, SHRADHA PARASHAR, NISHANT SAXENA & ALOK GOSWAMI

Now a days the information is transferred by using internet as it become easy and time saving. In this digital age the content can be easily change, copied & manipulate. In medical it become very crucial to established integrity of signal before utilization as it may cause wrong diagnosis of the patient. By using digital watermarking technique we can ensure the integrity of the signal. Reversible digital watermarking has provided a valuable solution to this problem. Digital watermarking is an act of hiding some information into signals. By using digital watermarking technique we can ensure the integrity of the signal. Once the information is embedded into the signal it will ensure the integrity but also change the signal to some extent. This embedded data will be removed after performing the integrity test. With this in mind, this work proposes techniques for hiding sensitive patient metadata within the actual medical signal, which are stored into a patient’s medical record. In specific, the focus is on Electroencephalogram (EEG) Signal and how to embed numerical metadata within the data. EEG signals, common tasks are the detection of seizure or other brain related illnesses. The watermarking technique based on random sequence is one of the well-known robust digital watermarks. In this paper, we propose a new idea to restore the original signal from a watermarked signal which was embedded a random sequence. The technique is based on wavelet transform. We look into the binary representation of each wavelet coefficient and embed an extra bit to expandable wavelet coefficient.

91-98

Authors: ANIL V. TURUKMANE & KAILASH D. KHARAT

A new probabilistic packet marking technology (called as P3M) based on path identification to defence serious distributed denial of service attacks and solves complex computation and other problem existed in traditional probabilistic packet marking (PPM) technologies. First contribution is constructing a new payload to carry router address and path identification. The second contribution is designing a new path identification scheme based on router addresses and hash algorithm. P3M is a practical technology to defence DDoS.

109-116

Authors: K. B. RAI & P. R. DEWAN

Wire EDM is one of the latest advanced micro-machining techniques, where a thin wire (Ǿ= 0.25 mm) of tool electrode is fed on the work piece which gradually shears off the material during the machining process. This micro-machining process may help overcome the limitations and restriction faced during conventional mechanical machining process. This paper is based on wire-EDM machining of a particular ISO standard Aluminium material. The varying input parameters are identified as Servo Voltage (V), Pulse on Time (Ton), Pulse off Time (Toff) and wire tension and the outputs response is measured and analyzed in terms of Surface Roughness (Ra). Taguchi’s method has been utilized for design of experiment followed by parametric optimization of wire EDM using GRA.

127-142

Authors: P. MUTHU VIJAY & AMAR PRAKASH

This paper presents analysis to study the effects of sloshing in overhead liquid storage tank. In such structure a large mass concentrated at the top of slender supporting structure makes the structure vulnerable to horizontal forces e.g. due to earthquakes. This study focuses mainly on the response of the elevated Intze type water tank to dynamic forces by both equivalents static method and finite element analysis using commercial software. To find out the design parameters for seismic analysis and also the importance in the sloshing effect consideration during the design. Here an elevated Intze type water tank is analysed and designed. The analysis is carried out for two cases namely, tank full condition considering only the hydrostatic effects and tank full condition considering the sloshing effect using STAAD Pro. From the analysis it is concluded that, to consider the sloshing effect along with the effect of hydrodynamic pressure on container wall of the tank during the design is very important in earthquake prone regions. The results obtained from analyses are discussed considering the importance of the structure during seismic activity.