Heritage Institute of Technology

About: Heritage Institute of Technology is a based out in . It is known for research contribution in the topics: Support vector machine & Transconductance. The organization has 581 authors who have published 1045 publications receiving 8345 citations.

Comparative study of three different bridge-less converters for reduction of harmonic distortion in brushless DC motor

Abstract: This paper represents a comparative study of three different types of DC-DC converter that can be used for reduction of total harmonic distortion (THD) in stator current, back electromotive force (EMF) and torque of brush less DC motor. In addition, the topologies of these converters are analysed, and the THD of the output characteristics have also been studied. In this work, SEPIC, Zeta and Flyback converters are considered and their outputs are fed to the BLDCM with the help of universal bridge or six step inverter. Moreover the THD of the output voltages are not only measured for three converters but also reduced by tuning the parameters. At first these three converters are modeled in MATLAB/ Simulink based simulation platform and studied the performance individually and further executed with hardware circuitry. Finally the output parameters from both software simulation and real time hardware are compared for these three converters separately and got satisfactory similar results. Again we studied the performance with these converters in terms of efficiency while fed in the commutation drive circuitry of BLDCM by considering minimum THD. From this comparative simulation results, it has been observed that Zeta converter showed maximum efficiency. Therefore, in real time hardware implementation, the commutation drive circuitry of BLDCM is studied with Zeta converter. With this configuration, a comparatively low THD of stator current, back EMF and electromagnetic torque have been achieved in BLDCM with PID controller.

Development of Micellized Antimicrobial Thiosulfinate: A Contemporary Way of Drug Stability Enhancement

Abstract: Over the past few decades, the development of bacterial resistance of antibiotics and dose-related toxicity of modern aggressive antibiotics has attracted attention to the dire need of new antibiotic discovery, which is efficient, cost-effective, and biocompatible. The ancient Indian medicinal system (Ayurveda) provided concepts of plant-based pharmacotherapy to treat infectious diseases. Medicinal plant parts contain numerous types of nutraceutical phytochemicals like flavonoids, phenols, thiosulfinate, quinones, alkaloids, terpenes, etc., which deliver significant antimicrobial properties and are known to be effective, edible, and nontoxic drugs. Their mode of action includes DNA inhibition, enzyme inactivation, cell wall and membrane damage, protein misfolding, denaturation, etc. of microorganisms. Several research works successfully demonstrated that these extracts are very effective against a wide range of pathogens and multidrug resistant (MDR) bacteria such as Methicillin-Resistant Staphylococcus aureus (MRSA), uropathogens, Klebsiella, Escherichia, etc. However, low extraction yield and unstable nature of phytochemicals pose major constraints in their commercial utilization. Micellization using biocompatible surfactants can be employed for enhanced drug delivery and stability. Naturally derived plant compounds can provide useful and low-cost source of antimicrobials to mitigate the challenges of drug discovery process required for antimicrobial chemotherapy.

Influence of Channel Thickness on Analog and RF Performance Enhancement of an Underlap DG AlGaN/GaN based MOS-HEMT Device

Abstract: This paper elucidates a comprehensive, illustrative and qualitative study on the Analog and RF performance of an Underlapped Double-Gate (U-DG) AlGaN/GaN heterojunction-based MOS-HEMT device with Hafnium-based high-k dielectric gate material. This paper presents the effect of GaN channel thickness variation on the drain current $\pmb{(I_{d})}$ , the transconductance $(g_{m})$ , output resistance $\pmb{(R_o)}$ , the intrinsic gain $\pmb{(g_{m}R_{o})}$ , transconductance generation factor $(g_{m}/I_{d})$ and the RF FOMs- total intrinsic gate capacitance $(C_{gg})$ and cut-off frequency $(f_{T})$ . These hetero-structured devices show superior performance as power transistors due to its enhanced efficiency, cost-effectiveness, reliability and controllability over silicon based conventional DG-MOS and HEMT transistors.

Supplier selection criteria and methods: past, present and future

Abstract: Sole purpose of supplier selection is not limited to get supply at low cost and at right time. Supplier selection is a strategic decision to fulfil company’s goal for long period of time at low risk. To accomplish this objective companies are moving from reactive buying to proactive buying to give more priority to co-creation of wealth with supplier/s. Considering this issue an attempt has been made in this paper to give systematic review of supplier selection and evaluation process from 2005 to 2012 to answer three main questions: (i) Which method is more appropriate for supplier selection? (ii) Which evaluating criteria were most cited? (iii) Is present trend of research is adequate enough to support proactive buying? In this regard, 78 papers are classified into 10 categories to identify factors affecting supplier selection and evaluation process. Statistical analysis has been conducted with software “R” to have better insight on the trend of research. Recommendations and future work is also included to verify inadequacy of existing methods, if any, to support proactive buying process.

Improving wireless sensor network lifetime through power aware clustering technique

Abstract: Wireless sensor networks have increased its application in industrial field as well as in scientific research very rapidly. Sensor nodes normally sense the physical events from the environment such as temperature, sound, pressure, vibration etc. In this paper we have implemented a cluster based routing protocol for reducing the consumption of energy by each sensor node. Here we have used a set of cluster head nodes within a cluster called “cluster head set”, instead of only one cluster head like other routing algorithms. Our proposed method states that within the set one node act as cluster head once at a time in rotation basis and aggregate the data from other nodes and send it to the base station. In comparison with LEACH or other cluster based routing protocols where only one Cluster head is used within a cluster it is shown that our proposed algorithm is more energy efficient.