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1

Analysis of Power Saving Class II Traffic in IEEE 802.16E with Multiple Sleep State and Balking

Misra C., Goswami V.

Foundations of Computing and Decision Sciences

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2015

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Vol. 40, No. 1

53--66

EN

The battery life of Mobile Stations in IEEE 802.16e can be extended substantially by applying the sleep mode mechanism. This paper studies an efficient method to analyze the performance of the power saving class type II for delay sensitive traffic in multiple sleep state. The incoming data frames may join or balk the buffer due to impatience with some probability. We present an M/M/1/N queueing model with balking and multiple vacations in order to exhibit the self-similar property of IEEE 802.16e. We develop a cost function to determine the optimal service rate that minimizes the total expected cost. Various performance indices such as the average number of data frames in the system, the mean waiting time of the data frame in the system, the the average balking rate due to impatience, etc. have been presented. Numerical results are provided to show the influence of various parameters on the behavior of the system. The proposed model provides a tradeoff between the average abandon rate and the power consumption.

2

Synthesis and characterization of some thiazolidinone derivatives possessing benzimidazole nucleus

Mehta P., Dawedra P., Goswami V., Joshi H. S.

International Letters of Chemistry, Physics and Astronomy

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2014

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Vol. 11, iss. 1

1-8

EN

Synthesis of new thiazolidinone derivatives possessing benzimidazole nucleus by condensation reaction of various substituted mercapto acids in presence of anhydrous ZnCl2. In our present study we have also synthesized Schiff bases of benzimidazole derivatives. All synthesized compounds were characterized by IR, 1H NMR and Mass spectroscopy.

3

Synthesis and biological activity of 1,2,4-triazolo-[3,4-b]thiadiazole as antimicrobial agents

Vekariya P. B., Pandya J. R., Goswami V., Joshi H. S.

International Letters of Chemistry, Physics and Astronomy

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2014

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Vol. 7

45--52

EN

Some novel 6-fluoro chroman derivatives having 1,2,4-triazolo-[3,4-b]thiadiazole were synthesized and characterized by IR, NMR and mass spectral analysis. All synthesized compounds were screened for antimicrobial activity using broth dilution method. All the compounds showed good antimicrobial activity and compound 5e showed significant antibacterial activity.

4

Dynamic provisioning and resource management for multi-tier cloud based applications

Goswami V, Patra S S, Mund G B

Foundations of Computing and Decision Sciences

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2013

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Vol. 38, No. 3

175--191

EN

Dynamic capacity provisioning is a useful technique for handling the workload variations seen in cloud environment. In this paper, we propose a dynamic provisioning technique for multi-tier applications to allocate resources efficiently using queuing model. It dynamically increases the mean service rate of the virtual machines to avoid congestion in the multi-tier environments. An optimization model to minimize the total number of virtual machines for computing resources in each tier has been presented. Using the supplementary variable and the recursive techniques, we obtain the system-length distributions at pre-arrival and arbitrary epochs. Some important performance indicators such as blocking probability, request waiting time and number of tasks in the system and in the queue have also been investigated. Finally, computational results showing the effect of model parameters on key performance indicators are presented.