Showing papers by "Motilal Nehru National Institute of Technology Allahabad published in 2004"
TL;DR: A geometric programming based computer-aided method to derive a reduced order (rth-order) approximant for a given (stable) SISO linear continuous-time system is presented.
Abstract: A geometric programming based computer-aided method to derive a reduced order (rth-order) approximant for a given (stable) SISO linear continuous-time system is presented. In this method, stability and the first r time moments/Markov parameters are preserved as well as the errors between a set of subsequent time moments/Markov parameters of the system and those of the model are minimized.
96 citations
TL;DR: In this article, the authors report the findings of case studies carried out in two large Indian manufacturing organizations, and highlight the status of adoption of FMS, and pay particular attention to the methods used to justify the investment involved.
Abstract: Over the past two decades, interest in the use of flexible manufacturing as a competitive weapon has increased significantly. Globalization and liberalization have forced Indian organizations to aim for globally competitiveness through the use of advanced technology, technical manpower, and innovative research and development. This paper reports the findings of case studies carried out in two large Indian manufacturing organization, and highlights the status of adoption of FMS. These organizations deal in the manufacture of shoes and railway coaches. The studies pay particular attention to the methods used to justify the investment involved. The experience of these firms’ can provide useful insight to other firms interested in implementing FMS.
48 citations
16 Aug 2004
TL;DR: It has been found that eight of nine Weyuker properties have been satisfied by the cognitive weight software complexity measure and hence establishes the cognitive complexity as a well structured one.
Abstract: Cognitive complexity measure is based on cognitive informatics, which in turn helps in comprehending the software characteristics. Weyuker properties must be satisfied by every complexity measure to qualify as a good and comprehensive one. An attempt has been made to evaluate cognitive complexity measure in terms of nine Weyuker properties, through examples. It has been found that eight of nine Weyuker properties have been satisfied by the cognitive weight software complexity measure and hence establishes the cognitive complexity as a well structured one.
37 citations
TL;DR: In this paper, the thermal buckling behavior of laminated cross-ply oval cylindrical shells is analyzed using finite element approach based on higher-order theory that accounts for the transverse shear and transverse normal deformations, and incorporates realistic through thickness approximations of the in-plane displacements.
32 citations
03 Mar 2004
TL;DR: A computer-aided method for obtaining a reduced-order approximant of a given (stable) single-input single-output system based on the minimisation of integral squared error pertaining to a unit-step input is presented.
Abstract: A computer-aided method for obtaining a reduced-order approximant of a given (stable) single-input single-output system based on the minimisation of integral squared error (ISE) pertaining to a unit-step input is presented. Both the numerator and denominator coefficients of the model are treated as free parameters in the process of optimisation. The method has a built-in stability-preserving feature. The problem of formulating the ISE is circumvented by introducing a set of equality constraints.
19 citations
TL;DR: In this paper, an analytical method based on Chebyshev polynomial is employed for postbuckling of laminated composite rectangular plates subjected to uniform in-plane temperature.
Abstract: The paper deals with the theoretical investigation of the postbuckling of laminated composite rectangular plates subjected to uniform in-plane temperature. An analytical method based on Chebyshev polynomial is employed. The formulation is based on Reissner–Mindlin plate theory and von Karman nonlinear kinematics. The resulting nonlinear coupled differential equations are linearized using quadratic extrapolation technique. Double Chebyshev finite series is used to discretize the differential equations. An incremental iterative approach is employed for the solution. The effects of temperature dependent mechanical and thermal properties on the limiting/critical temperature and the postbuckling response are studied. The numerical results for different boundary conditions and lamination schemes are presented. Analysis results indicate that temperature dependent properties reduce the critical/limiting temperature and postbuckling strength.
18 citations
TL;DR: In this article, the temperature distribution in the workpiece domain due to EDDG is obtained by superposition of the two temperature distributions for grinding and electrical discharge mechining (EDM), and the effects of duty cycle, on-time, current, energy partition, time of machining, and feed velocity are computationally investigated.
Abstract: Electrodischarge diamond grinding (EDDG) is a potential process for machining of advance engineering components, but there is no theory to support it. The work reported in this article makes an attempt in this direction. This article reports on determination of temperature distribution in the workpiece due to EDDG using the finite element method. The temperature distribution in the workpiece domain due to EDDG is obtained by superposition of the two temperature distributions for grinding and electrical discharge mechining (EDM) (i.e., 2D for grinding and axisymmetric for EDM). The effects of duty cycle, on-time, current, energy partition, time of machining, and feed velocity while machining are computationally investigated.
14 citations
TL;DR: In this article, a finite element model has been developed to estimate thermal stresses during EDDG when the current is switched off, and the effects of time of grinding and feed on thermal stress distribution have been reported.
Abstract: Excessive heat generated at the machining zone, during Electro-discharge diamond grinding (EDDG), is the major cause of thermal stresses, untempered martensite, overtempered martensite, and cracks. Therefore, the key to achieve good surface integrity in a machined part is to prevent excessive temperature and thermal stresses generated during machining process. A finite element model has been developed to estimate thermal stresses during EDDG when the current is switched-off. First, the developed code calculates the temperature in the workpiece and then the thermal stress field is estimated using this temperature field. Computations were carried out in plane strain condition for different down feeds of the grinding wheel. The effects of time of grinding and feed on thermal stress distribution have been reported. The thermal stresses are found to be higher near top surface at initial time of grinding but shifted away towards bottom after some grinding time.
13 citations
22 Dec 2004
TL;DR: The proposed model captures the mobility and distributive properties inherently found in a vigorous team activity as in a game of soccer and also has an efficient recovery mechanism to cope up with the failures of mobile nodes.
Abstract: In this paper, we propose a new transaction model, named as Team Transaction for distributed, cooperative computing on mobile ad hoc networks The proposed model captures the mobility and distributive properties inherently found in a vigorous team activity as in a game of soccer and also has an efficient recovery mechanism to cope up with the failures of mobile nodes.
4 citations
Journal Article•
TL;DR: The results of thermodynamic studies show that the As(III) adsorption on Mixed Oxide Coated Sand (MOCS) was endothermic in nature.
Abstract: A new granular media developed by coating of iron and manganese on quartz sand surface proved to be effective for arsenic (III) removal from water. The media has shown alkali resistance. The kinetic and thermodynamic studies data were tested using pseudo-second- order, intraparticle diffusion and Elovich equation models. The rate constants, equilibrium sorption capacity and normalized standard deviations were calculated for all the three models. It was shown that all three models almost accurately predict the sorption capacity with respect to time for whole range of data points. However, sorption kinetic data were better correlated using Elovich equation model based on normalized standard deviation. The Langmuir and Freundlich isotherm equations could be used to describe the partitioning behavior of system at different pH and media size. The results of thermodynamic studies show that the As(III) adsorption on Mixed Oxide Coated Sand (MOCS) was endothermic in nature. Kinetic and isothermal studies data have also been used to obtain thermodynamic parameters of the process.
4 citations
22 Dec 2004
TL;DR: A type system for pointcut designators (pcds) and advice forms of an aspect oriented programming langauge is presented, which assists in statically restricting the applicability of around advice to procedure call and procedure execution join points.
Abstract: We present a type system for pointcut designators (pcds) and advice forms of an aspect oriented programming langauge The type system classifies pcds as static, dynamic and implausible based on the static type information of the join points selected by the pcds Typing the pcds assists in statically restricting the applicability of around advice to procedure call and procedure execution join points This enables better reasoning about the behavior of around advice.
22 Dec 2004
TL;DR: A growable switch architecture based on the topological properties of Banyan Networks is presented and it is shown that the new network has a far better performance than the other networks.
Abstract: This paper focuses on designing a large N X N high-performance Fast Packet switch suitable for mixed ATM and IP traffic It is a Banyan network using cyclic interconnection among switching elements of the same stage We employ deflection-routing algorithm in each switching element The proposed routing is as simple as that of the generic Banyan network, and all the switching elements (SE's) have a uniform structure To design the proposed network and to develop its self-routing property we observe that all the SE's of the Banyan network are arranged in a regular pattern topologically We, thus, present a growable switch architecture based on the topological properties of Banyan Networks As a result, we show that the new network has a far better performance than the other networks.
27 Dec 2004
TL;DR: The overall performance shows that the developed adaptation can support a higher degree of QoS as compared to the conventional version of MANET routing protocol.
Abstract: This paper proposes adaptation of Mobile Ad-hoc Network (MANET) [13] routing protocols taking stability of links as primary consideration. The presented scheme can be associated with a resource reservation strategy to ensure Quality Of Service (QoS). Packets routed through stable routes have very low waiting time in queue which reduces end to end delay. The overall performance shows that the developed adaptation can support a higher degree of QoS as compared to the conventional version of MANET routing protocol.