College of Engineering, Pune

About: College of Engineering, Pune is a based out in . It is known for research contribution in the topics: Sliding mode control & Control theory. The organization has 4264 authors who have published 3492 publications receiving 19371 citations. The organization is also known as: COEP.

Performance analysis of congestion in Wireless Sensor Networks

Abstract: Now a day large research is going on in Wireless Sensor Network (WSNs). WSN is collection of various sensor nodes and one destination as sink. These nodes sense the environment and transmit data to the designation sink. The main aim of wireless sensor network is data dissemination to the destination sink which must be reliable. All the nodes send data at a time, so congestion may happen and is the most important problem in WSNs. Congestion causes arbitrary dropping of packet and energy wastage. This paper describes the performance analysis of existing routing protocol in WSNs. Simulation result shows the suitability protocol for random topology in terms of packet delivery ratio, received packets, total drop packets, node density.

Effects of short power interruptions and voltage sags on the performance of line start permanent magnet synchronous motor

Abstract: Line Start Permanent Magnet Synchronous motors are attracting growing attention for high duty factor industrial applications. Investigation of the performance of these motors under practical supply conditions facing power quality problems is the need of time. Voltage sags and short time interruptions contribute to 80% power quality related problems. In this paper, the behavior of this motor is studied under short power interruptions and voltage sag using dynamic model of the machine developed in Simulink platform.

Pellet sensor based asthma detection system using exhaled breath analysis

Abstract: Human breath is largely composed of oxygen, carbon dioxide, water vapor, nitrogen and numerous compounds in trace concentration. Exhaled Breath analysis is non-invasive, real-time and low cost technique which can be applied in medicine field both as a diagnostic tool and as a way to monitor the progress of therapies. This paper proposes a pellet sensor which responds to the exposure of exhaled breath. A proportion of zinc oxide and tin oxide nanopowder was used to fabricate gas sensor in the form of pellet. The pellet sensor response for asthmatic exhaled breath varies from normal exhaled breath response. The electrical conductivity, sensitivity, response time and recovery time of pellet sensor with asthmatic exhaled breath exposure has been studied and compared to the normal response. As a part of standard data collection, a spirometer apparatus for differentiating normal person and asthmatic patient is used. The response of pellet sensor is different for normal and asthmatic subjects with stable and repeated response. Characterization of pellet sensor is done for both normal and diseased case. The comparison between normal and asthmatic pellet sensor response can be used as an assistive tool for asthma disease detection.

A Buck-Boost topology based hybrid converter for standalone nanogrid applications

Abstract: This paper proposes a novel hybrid converter derived from a conventional Buck Boost DC-DC Converter. The principle of Augmented Sinusoidal Pulse Width Modulation (ASPWM) is used to derive the hybrid topology. It provides both AC and DC voltages using a single DC source as input. As a result of ASPWM switching, the voltage across the Buck-Boost stage inductor will contain a line frequency component, which can be extracted by a frequency selective network. The DC voltage gain for buck-boost converter with ASPWM has been derived and it is shown that buck-boost converter acts as a boost converter for all ranges of DC offset under ASPWM switching. The circuit has been extensively simulated in MATLAB/Simulink for various load conditions. The proposed circuit will have applications in standalone nanogrids where the loads will essentially be AC as well as DC.

Glycolytic Aminolysis of Poly (Ethylene Terephthalate) Waste at Atmospheric Pressure for Recovery of a Value Added Insecticide

Abstract: Reaction of poly (ethylene terephthalate) waste (PETW) powder with ethylene glycol (EG) in the presence of tetrahydrofurane (THF) using 0.003 mol zinc acetate as a catalyst was carried out in a batch reactor at 470 K and at atmospheric pressure. Reactions were undertaken with various particle size ranges from 50–512.5 µm, and reaction time from 30–70 min at 10 min intervals for reaction of PETW. A low molecular weight product of PETW was obtained during this step. In the next stage hydroxylamine hydrochloride (HAHC), cyclohexylamine (CHA), and potasium hydroxide solution were introduced to convert the low molecular weight product of PETW into terephthalohydroxamic acid (TPHA) by introduction of HCl as per stoichiometric requirement. The TPHA is used as insecticide, and it is highly expensive. To increase the PETW conversion rate, an external catalyst (zinc acetate) was introduced during the reaction. The product was deposited on the surface of unreacted PETW that was removed from the surface by ...