Gandhigram University

Tamilnadu, India

Gandhigram University

Tamilnadu, India

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Ponnusamy S.P.,in computer applications from Bharathidhasan University | Karthikeyan E.,Gandhigram University
ETRI Journal | Year: 2013

The development of proxy caching is essential in the area of video-on-demand (VoD) to meet users' expectations. VoD requires high bandwidth and creates high traffic due to the nature of media. Many researchers have developed proxy caching models to reduce bandwidth consumption and traffic. Proxy caching keeps part of a media object to meet the viewing expectations of users without delay and provides interactive playback. If the caching is done continuously, the entire cache space will be exhausted at one stage. Hence, the proxy server must apply cache replacement policies to replace existing objects and allocate the cache space for the incoming objects. Researchers have developed many cache replacement policies by considering several parameters, such as recency, access frequency, cost of retrieval, and size of the object. In this paper, the Weighted-Rank Cache replacement Policy (WRCP) is proposed. This policy uses such parameters as access frequency, aging, and mean access gap ratio and such functions as size and cost of retrieval. The WRCP applies our previously developed proxy caching model, Hot-Point Proxy, at four levels of replacement, depending on the cache requirement. Simulation results show that the WRCP outperforms our earlier model, the Dual Cache Replacement Policy. © 2013 ETRI.


Swapna R.,National Institute of Technology Tiruchirappalli | Ashok M.,National Institute of Technology Tiruchirappalli | Muralidharan G.,Gandhigram University | Kumar M.C.S.,National Institute of Technology Tiruchirappalli
Journal of Analytical and Applied Pyrolysis | Year: 2013

Transparent conductive Mo-doped ZnO (MZO) thin films with different thickness are prepared by spray pyrolysis method on glass substrates. The structural, surface morphological, electrical and optical properties of these films have been investigated as a function of the film thickness by a series of characterization techniques, including X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM), energy-dispersive X-ray (EDX) analysis, Hall effect measurements, UV-vis and luminescence spectroscopy. The structural analysis results show that the films are crystallized in the wurtzite phase type. The structural disorder decreases and the crystalline quality of the films is gradually improved up to an optimum thickness of 1865 nm. The SEM-EDX and elemental mapping results show that Mo is incorporated and distributed uniformly in all the MZO films. Hall measurement results indicated that the electrical properties depend considerably on film thickness. The resistivity decreases from 1.04 × 101 to 5.24 × 10-3 Ω cm with the increase of MZO film thickness from 632 nm to 1865 nm, and thereafter resistivity increases as thickness increases to 2290 nm. UV-vis measurements show that the average transmittance of the MZO thin films is 71.2% and average surface reflectance is about 8.8% in the visible range. The optical band gap and Urbach energy of the MZO films are also significantly influenced by the film thickness. The photoluminescence (PL) measurements indicate that the intensity of deep level emission significantly vary with the film thickness. © 2013 Elsevier B.V. All rights reserved.


Valliathal M.,Chikkaiah Naicker College | Uthayakumar R.,Gandhigram University
International Journal of Data Analysis Techniques and Strategies | Year: 2011

This paper discusses a deterministic inventory model for Weibull deteriorating items with partial backlogging under ramp type demand function. Shortages are allowed. Here we consider replenishment cycles, the time at which shortage begins; replenishment time and the optimal selling price are taken as decision variables. The objective of this model is to maximise the total profit (TP) which includes the sales revenue, purchase cost, the set up cost, holding cost, shortage cost and opportunity cost due to lost sales. We extend the results to ameliorating items also. Numerical examples are given to illustrate the model. Copyright © 2011 Inderscience Enterprises Ltd.


Valliathal M.,Chikkaiah Naicker College | Uthayakumar R.,Gandhigram University
International Journal of Services and Operations Management | Year: 2012

In this paper, we discuss retailer's optimal replenishment policies for non-instantaneous deteriorating items with partial backlogging under inflation over a finite horizon. The backlogging rate is a decreasing function of the waiting time up to the next replenishment. The objective of this model is to minimise the total cost of the retailer which includes the setup cost, holding cost, shortage cost and the opportunity cost due to lost sales. Here the total cost, time durations and the optimum number of replenishment are taken as decision variables. In the practical situation, it is not always possible that all the cost components in the total cost are known and have definite values. For reality, the cost components involved in the total cost of the retailer are fuzzified to a certain extent. Triangular fuzzy numbers are used to represent the mentioned costs. Signed distance method is used to defuzzify the triangular fuzzy numbers. Numerical examples are given to illustrate the model. Copyright © 2012 Inderscience Enterprises Ltd.

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