Meerut Institute of Engineering and Technology MIET

Meerut, India

Meerut Institute of Engineering and Technology MIET

Meerut, India
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van Do T.,Budapest University of Technology and Economics | Chakka R.,Budapest University of Technology and Economics | Chakka R.,Meerut Institute of Engineering and Technology MIET | Do N.H.,Budapest University of Technology and Economics | Pap L.,Budapest University of Technology and Economics
Acta Informatica | Year: 2011

Inspired by the need for performability models for HSDPA user equipment, a Markovian queue with varying number of servers is conceived. The arrival and the service processes, the number of allocated or active servers of the queue are inherently, and independently (or jointly) Markov modulated. Batch arrivals, batch services, autocorrelation of inter-arrival times, and autocorrelation of batch sizes can be accommodated in the queue, by a suitable use of Markov modulation and generalized exponential distribution. The queue has a provision for negative customers too. Transformations of the balance equations into a computable form are proposed in order to obtain the steady state probabilities with the Spectral Expansion method. This queue is used to model the High Speed Downlink Packet Access (HSDPA) wireless networks. The model is an integrated one with respect to HSDPA, capable of accommodating many of the intricate aspects of HSDPA such as, channel allocation policy, loss of packets due to channel fading, bursty and correlated traffic. Good agreement is observed between the numerical results of the proposed analytical model and those of an independent simulator of real HSDPA and radio channel behaviors. The comparison of the terminal categories specified by the 3rd Generation Partnership Project (3GPP) is also presented. © 2011 Springer-Verlag.


Chakka R.,Meerut Institute of Engineering and Technology MIET | Van Do T.,Budapest University of Technology and Economics
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2011

A new queueing model is proposed, namely the -Queue, also known as the Sigma queue. A steady state solution for this queue in a computable form is presented, based on an analytic methodology applying certain non-trivial transformations on the balance equations, which turn out to be of the QBD-M (Quasi Simultaneous-Multiple-Bounded Births and Deaths) type. As a consequence, existing methods such as the spectral expansion method or the matrix-geometric method can be used to obtain the steady state probabilities. The utility of this queue is demonstrated through the performance analysis of an optical burst switching (OBS) node. Numerical results show the impact of the burstiness of arrival process on the performance of the OBS multiplexer. © 2011 Springer-Verlag Berlin Heidelberg.


Van Do T.,Budapest University of Technology and Economics | Chakka R.,Meerut Institute of Engineering and Technology MIET
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2011

This paper suggests new queuing models, in the Markovian framework, which can tackle the presence of burstiness in the traffic and autocorrelations among the inter-arrival times of packets in the performance evaluation of next generation networks. These models are essentially based on certain generalizations of the Quasi Birth-Death (QBD) processes. Efficient steady state solution of these new queuing models, along with some illustrative applications, is presented. The proposed models and their further evolutions have the potential to be useful tools for the performance evaluation of modern telecommunication networks. © 2011 Springer-Verlag Berlin Heidelberg.


Do T.V.,Budapest University of Technology and Economics | Chakka R.,Meerut Institute of Engineering and Technology MIET
Communications in Computer and Information Science | Year: 2012

In order to extend the application opportunities of queues with working vacation to to the performance evaluation of practical systems with bursty traffic, we introduce the CPP/M/1 queue with working vacations. In this queue customers arrive in a batch having a geometric size distribution. We present a method and give closed form expressions for the steady state probabilities. We also show that a stochastic decomposition property exists for the CPP/M/1 queue with working vacations. © 2012 Springer-Verlag.


Van Do T.,Budapest University of Technology and Economics | Chakka R.,Meerut Institute of Engineering and Technology MIET
Simulation Modelling Practice and Theory | Year: 2010

The specification of the Multicast Address Dynamic Client Allocation Protocol (MADCAP) includes a mechanism to assign multicast addresses to the hosts in the Internet environment. MADCAP servers provide multicast address allocation services. A MADCAP client (that is, a host requesting multicast address allocation services via MADCAP) identifies a suitable MADCAP server and sends appropriate messages to the MADCAP server in order to request a multicast address. The mechanism makes the reuse of multicast addresses available with the MADCAP server, through the application of the lease-time concept. Estimating the performance measures of such a system, accurately and reliably, is very important for efficient use of resources and for achieving the QoS (Quality of Service) requirements. This paper proposes two approaches to estimate performability measures of the MADCAP dynamic allocation mechanism. They are essentially, an accurate one by simulation and a fast but approximate one by analytical solution. While the accuracy of the simulation method is limited by the length of the simulation, the analytical method is an approximate one but fast in computation. The detailed simulation model and the analytical method of the MADCAP dynamic allocation mechanism are presented, and the results are compared. Fairly good agreement is established between the simulation and the analytical results, giving rise to accurate and dependable computation of the performability measures. A solution approach using the QBD model for the performability analysis of the MADCAP mechanism is proposed, which has the computational complexity of the order O(c). Besides possessing the capability of tackling the problem with large c (the number of available IP multicast addresses is of the order of tens of thousands in the MADCAP server) in a very short time, it also gives numerically stable solution. The impact of the lease-time parameter on the performability of the MADCAP dynamic allocation mechanism is also investigated through a numerical study, and illustrated by graphs. © 2010 Elsevier B.V. All rights reserved.


Van Do T.,Budapest University of Technology and Economics | Chakka R.,Meerut Institute of Engineering and Technology MIET
Studies in Computational Intelligence | Year: 2013

This paper provides the proof for some fundamental properties of the generalised Markovian queue - HetSigma, which has been proposed in order to model nodes in modern telecommunication networks. The fundamental properties serve as the background for the efficient computational algorithm to calculate the steady state probabilities of the HetSigma queue. © 2013 Springer International Publishing Switzerland.


Do T.V.,Budapest University of Technology and Economics | Do N.H.,Budapest University of Technology and Economics | Chakka R.,Meerut Institute of Engineering and Technology MIET
Computer Communications | Year: 2012

Spectrum renting is an operation practice that can be applied to relieve the temporary capacity shortages of a specific service area in wireless cellular networks. However, works in the literature do not take into account the specific feature of the present wireless technology. That is, the separate blocks of user channels are defined in each frequency band in the current standards for public mobile cellular networks, and each block should be controlled by a single network operator. This paper is the first attempt to model the spectrum renting policies and the call admission control in a realistic way. The comparison between a queueing model and a simulation model confirms that the proposed queueing model incorporating exponentially distributed call durations can be used to evaluate the performance of mobile cellular networks with call holding times following the lognormal distribution as well. Numerical results show that the variants of the Fractional Guard Channel Policy provide an efficient tool to guarantee the grade of service of handover calls at the expense of increased blocking probability of fresh calls. Furthermore, only spectrum renting can be used to decrease the blocking probability of fresh calls without compromising the grade of service of handover calls. © 2012 Elsevier B.V. All rights reserved.


Singh A.,R V Northland Institute | Sharma P.K.,Meerut Institute of Engineering and Technology MIET | Majumdar D.K.,Delhi Institute of Pharmaceutical science and Research DIPSAR
Journal of Liquid Chromatography and Related Technologies | Year: 2014

In the present work, a new reverse phase-high performance liquid chromatography (RP-HPLC) method was developed, validated, and compared for estimation of the bis-triazole antifungal fluconazole (FLZ), in different simulated biological fluids, that is, gastric fluid simulant (GFS, pH = 1.5), vaginal fluid simulant (VFS, pH = 4.2), topical simulated media-phosphate buffer (PB, pH = 6.8), blood plasma simulant-phosphate buffer saline (PBS, pH = 7.4) and in methanol. For RP-HPLC the chromatography was carried out on a octadecyl silane (ODS-3) Hypersil C18 column (250 mm × 4.6 mm × 5 μm) using water (pH 5.2, adjusted with orthophosphoric acid) and acetonitrile (80:20, v/v) as the mobile phase at a flow rate of 2.5 mL/min with detection at 260 nm. The calibration curve of standard FLZ was linear in the range 0.2-40 μg/mL, 0.1-40 μg/L, 0.2-40 μg/mL, 0.1-40 μg/mL, and 0.2-50 μg/mL, in GFS, VFS, PB, PBS, and in methanol, respectively. All the methods were validated with respect to linearity, precision, accuracy, and specificity for intra- and inter-day and satisfied the International Conference on Harmonisation (ICH) and United States Food and Drug Administration (USFDA'S) guidelines. Copyright © 2014 Taylor & Francis Group, LLC.


Sharma D.K.,Meerut Institute of Engineering and Technology MIET | Kaushik B.K.,Indian Institute of Technology Roorkee | Sharma R.K.,National Institute of Technology Kurukshetra
Journal of Engineering, Design and Technology | Year: 2011

Purpose: The purpose of this paper is to explore the functioning of very-large-scale integration (VLSI) interconnects and modeling of interconnects and evaluate different approaches of testing interconnects. Design/methodology/approach: In the past, on-chip interconnect wires were not considered in circuit analysis except in high precision analysis. Wiring-up of on-chip devices takes place through various conductors produced during fabrication process. The shrinking size of metal-oxide semiconductor field effect transistor devices is largely responsible for growth of VLSI circuits. With deep sub-micron (DSM) technology, the interconnect geometry is scaled down for high wiring density. The complex geometry of interconnects and high operational frequency introduce wire parasitics and inter-wire parasitics. These parasitics causes delay, power dissipation, and crosstalk that may affect the signal integrity in VLSI system. Accurate analysis, sophisticated design, and effective test methods are the requirement to ensure the proper functionality and reliability of VLSI circuits. The testing of interconnect is becoming important and a challenge in the current technology. Findings: The effects of interconnect on signal integrity, power dissipation, and delay emerges significantly in DSM technology. For proper performance of the circuit, testing of interconnect is important and emerging challenge in the nanotechnology era. Although some work has been done for testing of interconnect, however, it is still an open area to test the parasitics effects of VLSI/ultra-large-scale integration interconnects. Efforts are required to analyze and to develop test methods for crosstalk, delay and power dissipation in current technology with solutions to minimize this effect. Originality/value: This paper reviews the functioning of VLSI interconnects from micrometer to nanometer technology. The development of various interconnect models from simple short circuit to latest resistance inductance capacitance transmission line model are discussed. Furthermore, various methodologies such as built-in self test and other techniques for testing interconnect for crosstalk and delay are discussed. © Emerald Group Publishing Limited.


Swathi Sri A.,Meerut Institute of Engineering and Technology MIET | Subrahmanyam A.,Meerut Institute of Engineering and Technology MIET
Current Trends in Biotechnology and Pharmacy | Year: 2012

A new alkalophilic variety of Streptomyces albus capable of growing up to pH 10 is described. It was isolated from the soil sample collected from MIET campus, Meerut, India.

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