Karachi Institute of Power Engineering

Karachi, Pakistan

Karachi Institute of Power Engineering

Karachi, Pakistan
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Rahat F.,Karachi Institute of Power Engineering | Ahsan S.N.,KANUPP
ICOSST 2015 - 2015 International Conference on Open Source Systems and Technologies, Proceedings | Year: 2015

Machine learning is widely used for network intrusion detection but the data it uses faces problems of large feature set and class imbalance which is inherent in network traffic data. This paper focuses on the performance evaluation of different strategies used for mitigating both the problems. Data used for classification was KDDCUP'99 which is a benchmark data set for intrusion detection and suffers greatly from class imbalance problem. Noise was also added to data to evaluate the performance of classifiers for noisy data. Different combinations of strategies form different scenarios. Four possible scenarios are tested by using different combinations of sampling, feature set reduction and classification. Classifiers are used for evaluating the performance of each scenario. Feature set was reduced to nine features from forty one features. Stratified remove folds and Resampling were applied to remove class imbalance problem. Results have shown that Nearest Neighbor, J48 classifier are best suited for real time detection with pre-processing whereas Gain Ratio is suitable for feature selection. © 2015 IEEE.

Ullah M.A.,Karachi Institute of Power Engineering | Qaiser A.,Karachi Institute of Power Engineering | Saeed Q.,Karachi Institute of Power Engineering | Abbasi A.R.,Karachi Institute of Power Engineering | And 2 more authors.
ICIEECT 2017 - International Conference on Innovations in Electrical Engineering and Computational Technologies 2017, Proceedings | Year: 2017

Load flow, voltage stability & short circuit analyses of a power system are essential for both design and operating stage performance monitoring and to ensure reliable grid operations by adequate protection scheme settings. In this research work, electrical model of a 1240 MW combined cycle power plant (CCPP) is developed on Electrical Transient Analyzer Program (ETAP) and load flow, voltage stability & short circuit analyses are performed. Effect of power grid voltage instability on system buses of the power plant is evaluated. Using load flow analysis that exploits Newton-Raphson algorithm, buses operating at under voltage due to power grid voltage instability are identified and their voltages are improved according to given voltage constraints that are based on buses criticality with respect to loads. On-load tap changers and reactive power compensation are used to improve steady state voltage stability. Optimal position for capacitor banks placement and number of capacitor banks are suggested by using optimal capacitor placement module of ETAP. The results of short circuit analysis are compared with short circuit current values experienced by the power plant sources. Consequently, favorable results have been accomplished through ETAP for all power system analyses. © 2017 IEEE.

Ali Z.,University of Technology Malaysia | Ali Z.,Karachi Institute of Power Engineering | Lee S.,University of Technology Malaysia | Lee S.,Nanyang Technological University | And 5 more authors.
Procedia Engineering | Year: 2011

The effect of self absorption becomes significant when plasma is dense enough to behave as optically thick. It is essential to account for the effect of self-absorption in that case. The variation of radial trajectory is investigated in this paper. In order to analyze the effect of self absorption of line radiation is investigated in argon plasma by observing the influence of pressure variation of gas. On comparison of the results of numerical experiment considering both aspects i.e. by including and excluding the self absorption term in Lee code an obvious deviation between the trajectories is observed. Last few fractions of seconds (200-300 ns) corroborated the slow compression phase. Results with self absorption showed the compression levels off while without self absorption radiative collapse was observed due to radiative cooling. Due to self absorption the absorbed radiation kept the plasma from radiative collapse turning the results to be more realistic.

Abbasi A.R.,Karachi Institute of Power Engineering | Hussain A.,Asian Institute of Technology | Afzulpurkar N.V.,Asian Institute of Technology
ECTI-CON 2010 - The 2010 ECTI International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology | Year: 2010

Affective computing systems with situated or ambient intelligence could be extremely effective in various application scenarios. However, majority of the proposed systems have limited utility since either they are strictly context-sensitive or otherwise too general. In this paper, we report on building and evaluating a context-aware yet situation-adaptive Bayesian inference framework that predicts human mental states in varying contexts.We use real and synthetic data to validate our hypothesis by modeling a three-layered Bayesian network (BN). We test this BN with two, and three context scenario, incrementally. The network gives an accuracy of above 85%. Thus, the framework may be utilized for multiple contexts, in variety of affective computing application scenarios.

Saleem M.,Karachi Institute of Power Engineering | Chakrabarti M.H.,University of Malaya | Irfan M.F.,University of Malaya | Hajimolana S.A.,University of Malaya | And 3 more authors.
International Journal of Electrochemical Science | Year: 2011

Electrokinetic remediation of nickel from low permeability soil using titanium electrodes having inter-electrode spacing of 10 cm was carried out in a cylindrical reactor. The influences of current density, voltage gradient and electrolyte pH were investigated upon removal efficiency for 60 h experimental runs. Efficiency improved from 49.3% to 57.2% when the current density was increased from 4.36 mA/cm2 to 13.1 mA/cm2. Furthermore, an enhancement in efficiency from 38.5% to 54.3% was observed when voltage gradient increased from 1 V/cm to 2 V/cm (at 13.1 mA/cm2). Further increase in voltage gradient to 2.5 V/cm improved efficiency during initial runs. However, an overall reduction of 3.2% was observed after 60 h of operation in comparison to that obtained at 2 V/cm. This may be attributed to precipitation and localized accumulation of metallic ions. An inverse relationship between efficiency and electrolyte pH was also observed (at 13.1 mA/cm2 and 2 V/cm). Although a removal of 74.1% was achieved at pH = 4.5, the system required optimization as the nickel content in treated soil was above the maximum values given in international standards. © 2011 by ESG.

Skyllas-Kazacos M.,University of New South Wales | Chakrabarti M.H.,University of Malaya | Hajimolana S.A.,University of Malaya | Mjalli F.S.,Sultan Qaboos University | Saleem M.,Karachi Institute of Power Engineering
Journal of the Electrochemical Society | Year: 2011

The past few decades have shown a rapid and continuous exhaustion of the available energy resources which may lead to serious energy global crises. Researchers have been focusing on developing new and renewable energy resources to meet the increasing fuel demand and reduce greenhouse gas emissions. A surge of research effort is also being directed towards replacing fossil fuel based vehicles with hybrid and electric alternatives. Energy storage is now seen as a critical element in future smart grid and electric vehicle applications. Electrochemical energy storage systems offer the best combination of efficiency, cost and flexibility, with redox flow battery systems currently leading the way in this aspect. In this work, a panoramic overview is presented for the various redox flow battery systems and their hybrid alternatives. Relevant published work is reported and critically discussed. A comprehensive study of the available technologies is conducted in terms of technical aspects as well as economic and environmental consequences. Some of the flow battery limitations and technical challenges are also discussed and a range of further research opportunities are presented. Of the flow battery technologies that have been investigated, the all-vanadium redox flow battery has received the most attention and has shown most promise in various pre-commercial to commercial stationary applications to date, while new developments in hybrid redox fuel cells are promising to lead the way for future applications in mechanically and electrically refuelable electric vehicles. © 2011 The Electrochemical Society.

Salem M.,Karachi Institute of Power Engineering | Abbasi A.R.,Karachi Institute of Power Engineering | Zia-Ul-Haque Q.S.M.,Karachi Institute of Power Engineering
Proceedings - 2010 6th International Conference on Emerging Technologies, ICET 2010 | Year: 2010

Use of robots in a nuclear power plant (NPP) is limited due to stringent safety considerations, however, they may be quite effective for auxiliary operations such as inspecting ducts, confined spaces, and places where there exists radiological hazard for a human operator. In this paper, we first review the present use of robots in nuclear industry followed by our report on the indigenous design and development of a prototypic tele-operated mobile robot. The proposed robot is identified for ventilation duct inspection in NPPs. Progress of present work is promising for actual implementation of the proposed robotic application. © 2010 IEEE.

Chakrabarti M.H.,University of Malaya | Ali M.,NED University of Engineering and Technology | Baroutian S.,University of Malaya | Saleem M.,Karachi Institute of Power Engineering
Process Safety and Environmental Protection | Year: 2011

Eruca sativa L. (known as taramira in South Asia) oil biodiesel shows good fuel properties when tested against ASTM D 6751 standard. Environmental performance of taramira oil B10 (10% (v/v) biodiesel blends with mineral diesel fuel, which is based upon the target set by the Government of Pakistan for 2025) in terms of engine exhaust emissions of CO2, CO, SO2, NOX and PM10 is compared with jatropha, castor and canola oil B10 fuels and found to be better. However, its calorific value is low thus resulting in poor engine performance in comparison to other B10 fuels. In addition, due to the high cost of taramira oil at present, it is not economical to produce in comparison to jatropha biodiesel. Study suggested that these drawbacks may be circumvented by growing taramira plants on large scale on marginal lands across South Asian countries and conducting further research to increase its calorific value. © 2010 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.

Shahid M.,NED UET | Saleem M.,Karachi Institute of Power Engineering | Ibrahim F.,NED UET
Pakistan Journal of Scientific and Industrial Research Series A: Physical Sciences | Year: 2011

Activated carbon was produced from shisham wood and coconut shell through chemical activation, using phosphoric acid and low temperature carbonization. Proximate analysis and characterization ofthe product were carried out and Brunauer Emmett Teller (BET) surface area, total ash content, moisture content, pH value and iodine number were determined. The product characteristics were well comparable with those ofthe commercially available activated carbon.

Zia T.,University of Sargodha | Bruckner D.,Vienna University of Technology | Zaidi A.,Karachi Institute of Power Engineering
IECON Proceedings (Industrial Electronics Conference) | Year: 2011

In automated energy management systems, to make instantaneous decisions based on the appliance status information, continuous data access is a key requirement. With the advances in sensor and communication technologies, it is now possible to remotely monitor the power consumption data. However, before an appliance is actively monitored, it must be identified using the obtained power consumption data. Appropriate methods are required to analyse power consumption patterns for proper appliance recognition. The focus of this work is to provide the model structure for storing and distinguishing the recurring footprints of the household appliances. Hidden Markov model based method is proposed to recognize the individual appliances from combined load. It is found that the proposed method can efficiently differentiate the power consumption patterns of appliances from their combined profiles. © 2011 IEEE.

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