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International Conference on Advances in Computing, Communications and Informatics (ICACCI)

作者： Ahana Malhotra Prerna Gaur Division of Instrumentation and Control Engineering Netaji Subhas Institute of Technology New Delhi India

ISBN: (纸本)9781479930814

The object of this paper is to design, simulate and compare the performance of different dc-dc converters in solar energy systems. This is designed for using single phase asynchronous motors in home appliances such as washing machines, refrigerator etc. and is simulated in MATLAB 8.1 using simulink, SimPower system. Perturb and Observe algorithm is used as MPPT algorithm to achieve the maximum power transfer from solar array. The PV input voltage is fed to the dc-dc converter and given to the single phase inverter.

关键词： Torque Inductors MATLAB

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Performance analysis of optical wireless communication system with a decode and forward relay

Performance analysis of optical wireless communication syste...

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International Conference on Signal Processing and Integrated Networks (SPIN)

作者： Mona Aggarwal Parul Garg Parul Puri Prabhat Kumar Sharma Division of Electronics and Communication Engineering Netaji Subhas Institute of Technology Dwarka New Delhi India

In this paper, we analyze the performance of the cooperative optical wireless communication (OWC) systems under the effect of atmospheric turbulence. We consider a dual-hop OWC system having a relay-assisted link between source and destination using a decode and forward (DF) relaying protocol. The atmospheric turbulence channels are modeled by independent but not necessarily identically distributed (i.n.i.d) gamma-gamma fading statistics. The exact closed form expressions of outage probability and average bit-error rate (BER) are derived using the power series representations of the modified bessel function of second kind and illustrated through numerical plots.

关键词： Bit error rate Relays Signal to noise ratio Fading Optical fiber communication Optical refraction Optical signal processing

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Multiple User Pair Scheduling in Bi-directional Single Relay assisted FSO Systems

Multiple User Pair Scheduling in Bi-directional Single Relay...

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IEEE International Conference on Communications

作者： Parul Puri Parul Garg Mona Aggarwal Prabhat Kumar Sharma Division of Electronics and Communication Engineering Netaji Subhas Institute of Technology Dwarka New Delhi India

This paper investigates a free space optical (FSO) communication system with multiple user pairs sharing a single relay over atmospheric turbulence induced fading channels effected by path loss. Multiuser diversity is achieved by applying various scheduling schemes at the relay. The performance of various scheduling schemes based on selection combining (SC) diversity and switched diversity are evaluated for the considered dual-hop, bi-directional, half-duplex relay system with network coding. Closed form expressions for the outage performance for different scheduling schemes have been derived.

关键词： Signal to noise ratio Diversity reception Relays Optical switches Fading Optical fiber networks

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Multiple user pair scheduling in TWR-FSO systems in presence of building sway

Multiple user pair scheduling in TWR-FSO systems in presence...

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International Conference on Signal Processing and Communications, SPCOM

作者： Parul Puri Parul Garg Mona Aggarwal Prabhat Kumar Sharma Division of Electronics and Communication Engineering Netaji Subhas Institute of Technology Dwarka New Delhi India

This paper investigates a two-way relay (TWR) assisted free space optical (FSO) communication system with multiple user pairs sharing a single relay via scheduling. A two-way, half-duplex, network-coded relay is considered which serves multiple user pairs over an optical channel characterized by path loss, atmospheric turbulence, and pointing errors (building sway). In addition, the relay employs a scheduler based on absolute signal-to-noise ratio (SNR) and normalized SNR based scheduling schemes. Novel closed form expressions for outage probability for both the scheduling schemes are derived and numerically analyzed for the considered system and channel models.

关键词： Signal to noise ratio Relays Adaptive optics Optical fiber communication Buildings Fading Closed-form solutions

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A novel MGF-based approach to analyze SIM-based relayed FSO systems

A novel MGF-based approach to analyze SIM-based relayed FSO ...

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International Conference on Advances in Computing, Communications and Informatics (ICACCI)

作者： Mona Aggarwal Parul Garg Parul Puri Division of Electronics and Communication Engineering Netaji Subhas Institute of Technology Dwarka New Delhi-1 India

In this paper, we analyze a subcarrier intensity modulation (SIM) based relayed free space optical (FSO) system assuming independent but not necessarily identically distributed (i.n.i.d) Gamma-Gamma turbulence channels. System employs a channel-state-information-assisted (CSI-assisted) amplify and forward (AF) relay. We derive the moment generating function (MGF) of the end-to-end signal to noise ratio (SNR) of the system and using the novel MGF, accurate closed-form expressions for capacity under different adaptive transmission schemes such as optimal rate adaptation (ORA) and channel inversion with fixed rate (CIFR) are derived. Further, we derive closed form expression for average symbol error rate (SER) of M-ary phase shift keying (MPSK) modulation schemes in terms of Meijer's G-function.

关键词： Signal to noise ratio Relays Closed-form solutions Channel capacity Modulation Fading Adaptive optics

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Performance analysis of full duplex relaying in multicell environment

Performance analysis of full duplex relaying in multicell en...

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International Conference on Advances in Computing, Communications and Informatics (ICACCI)

作者： Gaurav Sharma Prabhat Kumar Sharma Parul Garg Department of Electrical Engineering National Institute of Technology Kurukshetra India Division of Electronics and Communication Engineering Netaji Subhas Institute of Technology Dwarka New Delhi India

This paper analyzes the performance of the full duplex relaying (FDR) based cooperative communication system in a multi-cell environment. In multi-cell environment the FDR is prone to co-channel interferers due to higher reuse of the frequency. Owing to the possibility of imperfect mitigation at the relay we, in this paper, model the self-interference (or echo-interference) channel, which exists between the transmitting and the receiving antennas of the relay, as a fading channel with Nakagami-m fading distribution. For the decode and forward (DF) relay, we analyze the error performance and derive an exact closed form expression of the average bit error rate (BER). Further, an exact closed form expression for outage probability of the considered system is also obtained.

关键词： Relays Signal to noise ratio Fading Bit error rate Interference channels Closed-form solutions

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An ontology based framework for automatic detection and updation of requirement specifications

An ontology based framework for automatic detection and upda...

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International Conference on Contemporary Computing and Informatics (IC3I)

作者： MPS Bhatia Rohit Beniwal Akshi Kumar Department of Computer Engineering Netaji Subhas Institute Of Technology NSIT Delhi India Department of Computer Engineering Delhi Technological University DTU Delhi India

In recent years, integration among research field of Software engineering and Semantic Technologies took place due to the presence of vendors at different geographical and virtual locations. This integration also resulted in various issues and challenges that are still need to be addressed. Issues and challenges, which will keep this collaborated field dynamic and lively for years to come. Among such issues, one is to automate the process of detection and updation of requirements specifications using ontologies during maintenance phase. This paper presents a framework approach for the above issue. Further it provides a metric suite that can be used to evaluate effectiveness of the approach.

关键词： Ontologies Software engineering Maintenance engineering Software Semantic Web Measurement Conferences

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Performance analysis of induction motor drive with optimal rotor flux for energy efficient operation

Performance analysis of induction motor drive with optimal r...

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International Conference on Advanced Communication, Control and Computing Technologies (ICACCCT)

作者： Bhavnesh Kumar Yogesh K. Chauhan Vivek Shrivastava Division of ICE Netaji Subhas Institute of Technology School of Engineering Gautam Buddha University Department of Electrical Engineering Rajasthan Technical University

In this paper, performance analysis of an induction motor drive employing a loss minimization algorithm (LMA) is presented. As the induction motors are not designed to impart high efficiency under partial loading conditions, proposed LMA is used to improve the efficiency under such load conditions. For the efficiency improvement LMA uses the rotor flux as a control variable. Mathematical model of induction motor in field-oriented frame, including proposed loss model is derived. The complete drive system is simulated in MATLAB/Simulink software for different operating conditions. Simulation results obtained shows the effectiveness of the proposed algorithm in partial loading conditions.

关键词： Induction motors MATLAB Magnetic losses Pulse width modulation Inverters

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Surface Quality Modification Using Powder Metallurgy Processed CuW Electrode During Electric Discharge Machining of Inconel 718

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Procedia Materials Science 2014年 5卷 2629-2634页

作者： Naveen Beri Sachin Maheshwari Chitra Sharma Anil Kumar Department of Mechanical Engineering Beant College of Engineering and Technology Gurdaspur 143521 Punjab India Division of Manufacturing Process & Automation Engineering Netaji Subhas Institute of Technology Dwarka New Delhi110078. India Department of Mechanical and Automation Engineering IGIT Kashmere Gate Delhi 110403. India

Use of powder metallurgy processed (PM) electrode in electrical discharge machining (EDM) has emerged as an alternate tooling option with a view to impart improved surface properties to the work surface. Preliminary investigation with CuW PM electrode using Taguchi method was done on Inconel 718 to obtain best parameter settings for higher the better surface roughness. In the present work surface micro hardness study and X-ray diffraction (XRD) analysis was performed on the machined surface at the best parameter setting and comparison was done with the surface machined using conventional copper electrode. It was observed that the micro hardness of the machined surface was improved from 380.9 HV of the base metal to 496.7 HV of the surface machined with powder metallurgy processed electrode. XRD analysis revealed the formation of Fe2W3C6 phase on the machined surface causing remarkable improvement in the surface micro hardness.

关键词： Powder metallurgy (PM) electrical discharge machining (EDM) X-ray diffraction (XRD) micro hardness recast layers electrode.

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Stability Analysis of Parallel Fuzzy P + Fuzzy I + Fuzzy D Control Systems

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International Journal of Automation and computing 2013年第2期10卷 91-98页

作者： Vineet Kumar A. P. Mittal R. Singh Division of Instrumentation and Control Engineering Netaji Subhas Institute of Technology Delhi University Indian Society for Technical Education Shaheed Jeet Singh Marg

The study presented in this paper is in continuation with the paper published by the authors on parallel fuzzy proportional plus fuzzy integral plus fuzzy derivative （FP ＋ FI ＋ FD） controller. It addresses the stability analysis of parallel FP ＋ FI ＋ FD controller. The famous＂small gain theorem＂ is used to study the bounded-input and bounded-output （BIBO） stability of the fuzzy controller. Sufficient BIBO-stability conditions are developed for parallel FP ＋ FI ＋ FD controller. FP ＋ FI ＋ FD controller is derived from the conventional parallel proportional plus integral plus derivative （PID） controller. The parallel FP ＋ FI ＋ FD controller is actually a nonlinear controller with variable gains. It shows much better set-point tracking, disturbance rejection and noise suppression for nonlinear processes as compared to conventional PID controller.

关键词： Proportional plus integral plus derivative （PID） fuzzy proportional plus fuzzy integral plus fuzzy derivative （FP ＋ FI ＋ FD） controller fuzzy control bounded-input and bounded-output （BIBO） stability nonlinear process.

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