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Farīdābād, India

Raj T.,YMCA Institute of Engineering | Shankar R.,Indian Institute of Technology Delhi | Suhaib M.,Jamia Millia Islamia University | Khan R.A.,Jamia Millia Islamia University
International Journal of Services and Operations Management | Year: 2010

Manufacturing organisations adopt Flexible Manufacturing Systems (FMSs) to meet the challenges imposed by today's volatile market standards. But the implementation of FMSs is not an easy job. Various barriers are experienced in real-life cases during its implementation. It is very much necessary to analyse the nature and impact of these barriers so that production managers can think of some strategies to overcome these barriers. In the present work, a Graph-Theoretic Approach (GTA) has been utilised to find the intensity of these barriers through an index which is calculated through a permanent function obtained from the digraph of FMS barriers. Copyright © 2010 Inderscience Enterprises Ltd. Source

Singh L.,YMCA Institute of Engineering | Khan R.A.,Jamia Millia Islamia University | Aggarwal M.L.,YMCA Institute of Engineering
Journal of Engineering Research | Year: 2011

Austenitic stainless steel cannot be hardened by any form of heat treatment, in fact, quenching from 10000C merely softens them. They are usually cold worked to increase the hardness. Shot peening is a cold working process that changes micro-structure as well as residual stress in the surface layer. In the present work, the compressive residual stress and fatigue strength of AISI 304 austenitic stainless steel have been evaluated at various shot peening conditions. The improvement in various mechanical properties such as hardness, damping factors and fatigue strength was noticed. Compressive residual stress induced by shot peening varies with cyclic loading due to relaxation of compressive residual stress field. The consideration of relaxed compressive residual stress field instead of original compressive residual stress field provides reliable fatigue design of components. In this paper, the exact reductions in weight and control of mechanical properties due to shot peening process are discussed. Source

Dixit A.,YMCA Institute of Engineering | Sharma A.K.,YMCA Institute of Engineering
2010 IEEE 2nd International Advance Computing Conference, IACC 2010 | Year: 2010

WWW's expansion coupled with high change frequency of web pages poses a challenge for maintaining and fetching up-to-date information. The traditional crawling methods are no longer catch up with this updating and growing web. Alternative distributed crawling scheme that uses migrating crawlers try to maximize the network utilization by minimizing the network load but are hampered due to the deficiency in their web page refresh techniques. The absence of effective measures to verify whether a web page has been changed or not is another challenge. In this paper, an efficient approach for computing revisit frequency is being proposed. Web pages which frequently undergo up-dation are detected and accordingly revisit frequency for the pages is dynamically computed. ©2010 IEEE. Source

Garg V.K.,Guru Jambheshwar University of Science and Technology | Gupta R.,YMCA Institute of Engineering
Bioremediation Journal | Year: 2011

Experiments were conducted in winter (October to January) and summer (May to August) seasons to study the effect of seasonal temperature variations on the vermicomposting of household waste using Eisenia fetida earthworms. The prevailing temperatures during experiments were in the range of -2.7°C to 35.0°C during winter season and 18.0°C to 44.4°C during summer season. Organic matter degradation was higher during winter than summer season. The electrical conductivity (EC) of vermicomposts was increased in the range of 2.3-7.8% in winter season; however, the increase in EC was 0.9-1.8% during summer season for different waste mixtures. There was about 56.2-80% increase in total Kjeldahl nitrogen (TKN) content during winter season, whereas the TKN increase was 23.9-44% during summers. The C:N ratio also decreased remarkably in all the waste mixtures during vermicomposting in both the seasons. However, the C:N ratio reduction was more significant during winter (47-60%) than in summer (31-44%). After the observation period, the net worm biomass achieved was higher during winter than summer season. The temperature variations during winter supported the life activities of earthworms more favourably than in summer. The results indicated that growth and reproductive potential of the earthworms were affected not only by the quality and quantity of the feed but also by ambient temperature. Copyright © 2011 Taylor and Francis Group, LLC. Source

Raj T.,YMCA Institute of Engineering | Attri R.,YMCA Institute of Engineering | Jain V.,Gurgaon Institute of Technology and Management
International Journal of Industrial and Systems Engineering | Year: 2012

Today's dynamic market has forced the manufacturing managers to take interest in flexibility which bestows on an industry to respond promptly to market opportunities and changing technologies. The development of capabilities to be flexible rests on the mandate of top management, helps industries to manage market uncertainties and tends to enhance manufacturing performance. Manufacturing organisations are looking at flexible manufacturing system (FMS) as a viable alternative to enhance their competitive edge. There are, however, some factors affecting the flexibility of FMS. The aim of this research is to analyse and identify those factors which influence some other factors in a big way (called driving factors) and those which are most influenced by the others (called dependent factors). In this paper, these factors have been identified through literature, their ranking is done by a questionnaire-based survey and interpretive structural modelling (ISM) approach has been utilised in analysing their mutual relationships. An ISM model of these factors has been prepared to identify some key factors and their managerial implications. © 2012 Inderscience Enterprises Ltd. Source

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