Usman Institute of Technology

Karachi, Pakistan

Usman Institute of Technology

Karachi, Pakistan
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Katyara S.,Sukkur Institute of Business Administration | Staszewski L.,AGH University of Science and Technology | Musavi H.A.,Indus University | Soomro F.,Usman Institute of Technology
International Journal of Mechanical Engineering and Robotics Research | Year: 2017

With the emerging issues about the ecological pollution and potential energy deficiency, many efforts are taken to initiate the renewable energy plans, established primarily with wind energy, solar panels and low capacity water power plants etc. These forms of power production are called Distributed Generation (DG), as they are installed near the load centers. Power utilities all over the world are welcoming DGs to increase their generation capacity. With the aim to cut electricity bills, DGs are brought into power networks in order to meet the increased load demands especially during peak hours. It is expected that in the future, more and more DGs will be taken into system. Therefore, with the increased number of DGs, the fault level issue becomes more complex. The interconnection of DG introduces somehow protection problems such as islanding, relay settings and increase of short circuit capacity. In this research, the influence of DG interconnection over the short circuit capacity in the radial distribution network was analyzed and the effective protection scheme for distribution network was proposed then. The effective method for setting the optimal Coordination Time Intervals (CTI) between the transformer and the feeder relays in real distribution systems was also discussed. A protection scheme based on over-current techniques was proposed for synchronous DGs, connected to utility feeder operating in grid-coupled mode, in order to make the most of DG benefits to customers. The proposed solutions were verified with MATLAB software simulations. © 2017 Int. J. Mech. Eng. Rob. Res.

Umair M.,Usman Institute of Technology | Mujeeb-Ur-Rehman,PCSIR Quetta Laboratories | Iqbal A.,University of Balochistan
Case Studies in Engineering Failure Analysis | Year: 2017

This is a case study regarding frequent forced outages in an oil-fired power generating station due to failure of fire resistant fluid (FRF) piping of material ASTM A-304. This analysis was done to find out the most probable cause of failure and to rectify the problem. Methods for finding and analyzing the cracks include nondestructive testing techniques such as visual testing (VT) and dye penetrant testing (PT) along with that periodic monitoring after rectification of problem. The study revealed that pitting and pit to crack transitions were formed in stainless steel piping containing high pressure (system pressure 115 bars) fire resistant fluid. However, after replacement of piping the pitting and cracking reoccurred. It was observed that due to possible exposure to chlorinated moisture in surrounding environment pitting was formed which then transformed into cracks. The research work discussed in this paper illustrates the procedure used in detection of the problem and measures taken to solve the problem. © 2017 The Authors

Sohail S.,Usman Institute of Technology | Nasim S.,NED University of Engineering and Technology | Khan N.H.,Sir Syed University of Engineering and Technology
ICIEECT 2017 - International Conference on Innovations in Electrical Engineering and Computational Technologies 2017, Proceedings | Year: 2017

In today's advanced technological life, everybody is quite familiar with the significance of efforts to establish safety in our lives. So in this regard, many attempts have been made by researchers and one of them is flying robot's innovation. Self-ruling Quad Copter or unmanned aerial vehicle (UAV) is fundamentally a 4 engine unmanned ethereal vehicle which can fly with no pilot, the development and the velocity of the quad copter is controlled by the diverse systems and calculations. UA V is accurately made to keep up harmony between velocity, weight, soundness and force. It abides in four adjusted dispersed arms with engines; the mix of the variety in the velocity of the engines is utilized to change its position in a specific manner. All the association has been carried out in the middle of the Unmanned Quadcopter, on the inside of the UA V the Ardupilot module is set which is utilized to send the signals to the engine with respect to the estimation of the sensors like GPS (U Blox GPS v2.0), Gyro, Accelerometer and Barometer (utilization to keep up a particular height). We show how to perform advance operations of stabilization, autonomous behavior with super simple mode, gesture control via Kinect sensor, video tracking with face detection and safe landing in water. The venture is implicit request to make a settle and programmed flight starting with one direction then onto the next direction with characterize height and pace. It must be remembered that the procurement of computations and investigation of inertial measurement system must be performing precisely. Basically, this UA V (Quad Copter) full fill the needs of any clever gear which is utilized to screen the ranges which are not in human reach. © 2017 IEEE.

Khan B.M.,National University of Sciences and Technology | Bilal R.,Usman Institute of Technology
International Journal of Applied Engineering Research | Year: 2017

Adhoc protocols present challenges like reliability, routing overheads, channel capacity utilization and latency in the network. Interferences and dynamic changes in network causes frequent paths disconnectivity due to which the network throughput decreases. In this paper, an improved protocol with adaptive cross layer (Adap-CP) is proposed which reduces the routing process and utilize the channel capacity in a better way. This new approach enhances the network performance significantly as compare to conventional 802.15.4 and AODV in terms of throughput, route discovery rate, PDR and energy efficiency. In rest of the paper, we will refer enhanced adaptive cross layer protocol as Adap-CP and conventional cross layer of 802.15.4 and AODV as Conv-P. © Research India Publications.

Bilal R.,Usman Institute of Technology | Khan B.M.,National University of Sciences and Technology
International Journal of Applied Engineering Research | Year: 2017

This paper addresses the challenges of high mobility and frequent topology changes in Flying Ad-hoc Networks (FANETs) by presenting the first of its kind comprehensive analysis of mobility models. They govern the movement pattern of UAVs and the variation in speed and direction that occur over time. Therefore, the simulation study of effective routing strategies depends on suitable mobility models. In this paper, we have performed experimental performance evaluation of available mobility models that can generate realistic scenarios for FANET applications. Both reactive (AODV and DSR) and proactive (OLSR) routing protocols are compared for Reference Point Group Mobility model, Gauss Markov mobility model, Random Waypoint mobility model and Manhattan Grid Mobility model. Packet Delivery Ratio (PDR), Average End-to-End Delay, and routing overhead were used as performance metrics for examining maximum reliability and minimal latency requirements of FANETs. Results show that Dynamic Source Routing (DSR) outperforms Ad-hoc On Demand Distance Vector (AODV) and Optimized Link State Routing (OLSR) in terms of PDR, latency and routing overhead for all mobility models. © Research India Publications.

Pasta M.Q.,Karachi Institute of Economics & Technology | Pasta M.Q.,Usman Institute of Technology | Zaidi F.,Karachi Institute of Economics & Technology
IEEE Access | Year: 2017

One of the most widely studied problems in the analysis of complex networks is the detection of community structures. Many algorithms have been proposed to find communities but the quest to find the best algorithm is still on. More often than not, researchers focus on developing fast and accurate algorithms that can be generically applied to networks from various domains. As the topology of networks changes with respect to domains, community detection algorithms fail to accommodate these changes to detect communities. In this paper, we attempt to highlight this problem by studying networks with different topologies and evaluate the performance of community detection algorithms in the light of these topological changes. To generate networks with different topologies, we used the well-known Lancichinetti-Fortunato-Radicchi (LFR) model, and we also propose a new model named Naïve Scale-Free Clustering to avoid any bias that can be introduced by the underlying network generation model. Results reveal several limitations of the current popular network clustering algorithms failing to correctly find communities. This suggests the need to revisit the design of current clustering algorithms in order to improve their performances. © 2013 IEEE.

Qadir A.,Usman Institute of Technology | Ali A.,NED University of Engineering and Technology
Advanced Materials Research | Year: 2014

This paper describes a current mode filter using two current feedback amplifiers (CFA's). One CFA is used to simulate a negative resistor. The proposed circuit is very useful for low as well as high frequency applications. Circuit is simple and canonic. The use of grounded capacitors in the design make it suitable for implementation in CMOS technology. © (2014) Trans Tech Publications, Switzerland.

Qadir A.,Usman Institute of Technology | Ali A.,NED University of Engineering and Technology
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2013

In linear system theory impulse response of any system is of great significance. It is the impulse response which is helpful in determining the convolution in continuous time system (unit sample response in Digital Signal Processing). The impulse response of simple systems can be calculated from the system differential equation or from the transfer function of the system (by taking the inverse Fourier Transform of transfer function). To the best of author's knowledge there exists no such scheme in the literature so far showing any practical method that can demonstrate the impulse response of a system on the oscilloscope. In this paper the method of demonstrating the impulse response of any linear system to the undergraduate students is presented. The approach is simple and is developed with minimum component count. © 2013 SPIE.

Akbar M.A.,National University of Computer and Emerging Sciences | Qadir A.,Usman Institute of Technology
Procedia Engineering | Year: 2012

Today, the autonomous robots are widely used to perform task in a wide variety of application. A number of research works has been carried out to examine and remove problems faced by the current robotic world. The theme of this paper is to discuss different design consideration along with their limitations and solutions for an autonomous robot which will be able to climb and cross the ramp and place boxes on to stands placed at different points of arena using line following principle. The implementation of this robot was the theme of "NERC 2010". The robot has also the limitation of weight, size and power. © 2012 Published by Elsevier Ltd.

Lohana P.,Usman Institute of Technology
IEEE Engineering Management Review | Year: 2015

MANY young engineers, ready to begin their professional career, need to demonstrate professionalism that goes beyond changing their attire or carrying a briefcase, but instead conducting themselves with a professional attitude i.e., their communication and interpersonal skills in pursuing their technical activities. © 1973-2011 IEEE.

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