YMCA University of Science and Technology

About: YMCA University of Science and Technology is a education organization based out in Faridabad, India. It is known for research contribution in the topics: Web page & Web crawler. The organization has 299 authors who have published 568 publications receiving 4547 citations.

Buck-Boost Control of Four Quadrant Chopper using Symmetrical Impedance Network for Adjustable Speed Drive

Abstract: This paper proposes buck-boost capabilities of four quadrant chopper for wide range speed control of DC motor drives using symmetrical impedance network called Z-source network. By controlling the shoot through duty ratio from 0 to 0.5 and non-shoot through techniques, the Z-source four quadrant choppers can produce any desired DC voltage across the DC motor. The switching patterns for both buck and boost operations are presented to achieve four modes of operation of DC motor. As a result, the proposed model will have ride through capability during voltage sags, manage during voltage swells, used in any types of DC voltage sources such as fuel cell and solar cell and improve the reliability by reducing EMI noise. Analysis and simulation results are presented to demonstrate these new findings.

Towards realistic performance evaluation of Mobile Ad Hoc Network

Abstract: Mobile Ad-Hoc Network (MANET) is a self-configuring network of mobile nodes connected by wireless links to form an arbitrary topology without the use of existing infrastructure. In order to facilitate communication between a pair of nodes, routing protocols are used. The performance of routing protocols is evaluated using simulation tools such as QUALNET, NS-2 and MATLAB etc. Simulation tool provides researchers with a number of significant benefits, including repeatable scenarios, isolation of parameters, and exploration of a variety of metrics. We wish to make these simulations more realistic for ad hoc network. To do the same different shapes such as square, elliptical, circular and rectangular of the simulation region were taken. In addition to different shapes, we used the concept of obstacle. These obstacles restrict node movement as well as obstruct the communication path between nodes. Simulation results show that for same number of nodes deployed having equal areas and with different shapes the throughput will have inverse relationship with perimeter. The result can be very useful while designing a routing protocol.

Managing the Utility of Manufacturing Process Facilities through Lean Supply Chain

Abstract: Purpose: The product’s features and parameters are increasingly dependent upon the organization’s competencies regarding infrastructural adequacies and abilities of the organization to manage its equipment and facilities in an optimal manner. This article aims to couple the Lean principles with supply chain characteristics in an Indian environment. The relationship between these two methodologies has common attributes with a different course of actions which results in enhanced performance as an outcome. The main aim to establish this relationship is to set- out the focus of all entrepreneurs on customer satisfaction and at lowest cost of the product. Methodology: The methodology adopted over here is a review based empirical research on the published literatures on both Lean Manufacturing and Supply Chain Management. The relationship between these two methodologies is established. Restraints: The conclusion drawn from the review is based upon various authors’ perception on either or both in integrated form, say as “Lean Supply Chain subjects Management”. Further, the misapplication of LSCM approach will lead to a waste of multiple resources. Requirement: Indian entrepreneur is looking for his share in global market. Such a situation has arisen because Indian manufacturers constantly aim at production of high quality product at low cost with efficient utilization of resources using Pull Production. LSCM approach when implemented in Indian manufacturing environment is expected to build the confidence level of the customer towards Indian manufacturers. Results: The communication channel, culture and environment for an organization are proposed as the important parameters, which lead to an organization towards success/ failure. The smooth flow of material is possible only in the case where information is utilized at its optimum level. Additionally, the identification of Ten Commandments (10-C) which are common to both methodologies along with their influence on Industrial Performances is stipulated to help in the various fields where these commandments have influence are demand collaboration with operational resources and suppliers, operation planning, inventory management practices, identification and elimination of non value- added activities etc.

Relevant document crawling with usage pattern and domain profile based page ranking

Abstract: WWW is a distributed heterogeneous information resource. With the exponential growth of WWW, it has become difficult to access desired information that matches with user needs and interest. In spite of strong crawling, indexing and page ranking techniques, the returned result-sets of the search engine lack in accuracy and preciseness. Large number of irrelevant links, topic drift, and load on servers are some of the other issues that need to be addressed towards developing an efficient search engine. In this paper a solution is being proposed for the development of a crawling technique that attempts to reduce server load by taking advantage of migrants for downloading the relevant pages; pertaining to a specific topic only. The downloaded documents are then ranked considering user preferences and past usage patterns of the web page thereby improving the quality of retuned result-sets.