Misra S.,Indian Institute of Technology Kharagpur |
Oommen B.J.,Carleton University |
Oommen B.J.,University of Agder |
Yanamandra S.,Indian Institute of Technology Kharagpur |
And 2 more authors.
IEEE Transactions on Systems, Man, and Cybernetics, Part B: Cybernetics | Year: 2010
In this paper, we present a learning-automata-like1 (LAL) mechanism for congestion avoidance in wired networks. Our algorithm, named as LAL Random Early Detection (LALRED), is founded on the principles of the operations of existing RED congestion-avoidance mechanisms, augmented with a LAL philosophy. The primary objective of LALRED is to optimize the value of the average size of the queue used for congestion avoidance and to consequently reduce the total loss of packets at the queue. We attempt to achieve this by stationing a LAL algorithm at the gateways and by discretizing the probabilities of the corresponding actions of the congestion-avoidance algorithm. At every time instant, the LAL scheme, in turn, chooses the action that possesses the maximal ratio between the number of times the chosen action is rewarded and the number of times that it has been chosen. In LALRED, we simultaneously increase the likelihood of the scheme converging to the action, which minimizes the number of packet drops at the gateway. Our approach helps to improve the performance of congestion avoidance by adaptively minimizing the queue-loss rate and the average queue size. Simulation results obtained using NS2 establish the improved performance of LALRED over the traditional RED methods which were chosen as the benchmarks for performance comparison purposes. © 2009 IEEE.
Panda B.N.,University of Lisbon |
Garg A.,Shantou University |
Shankhwar K.,Kalinga Institute of Industrial Technology
Measurement: Journal of the International Measurement Confederation | Year: 2016
The significant amount of research has been done in improving the mechanical properties (compressive strength), dimensional accuracy (length, height and width), and build time of the components manufactured from the additive manufacturing process. In contrast to this, the research in the optimization of environmental characteristic i.e. energy consumption for the additive manufacturing processes such as selective laser sintering (SLS), and selective laser melting (SLM) needs significant attention. These processes intakes the significant portion of input laser energy for driving the laser system, heating system and other machine components. With world moving towards globalization of additive manufacturing processes, the optimization of laser energy consumption thus become a necessity from productivity and as well as an environmental perspective. Therefore, the present work performs the empirical investigation by proposing the optimization framework in modelling of laser energy consumption of the SLS process. The experimental procedure involves the computation of energy consumption by measuring the total area of sintering. The optimization framework when applied on the experimental data generates the functional expression for laser energy consumption which suggests that the slice thickness is a vital parameter in optimizing it. The implications arising from the study is discussed. © 2016 Elsevier Ltd. All rights reserved.
Nanda A.K.,Birla Institute of Technology |
Panigrahi C.K.,Kalinga Institute of Industrial Technology
Frontiers in Energy | Year: 2016
The major portion of energy in a building is consumed by heating, ventilating, and air-conditioning (HVAC). The traditional heating and cooling systems contribute greatly to the emission of greenhouse gases, especially carbon dioxide. Four different ways, i.e., Trombe wall, solar chimney, unglazed transpired solar façade, and solar roof, are adopted for solar heating. Similarly, two major ways, i.e., evaporative cooling and building integrated evaporative cooling are adopted for cooling of the building. Therefore, an attempt has been made in this paper to compile the developments of solar heating and cooling technologies in a building. © 2016 Higher Education Press and Springer-Verlag Berlin Heidelberg
Panigrahi S.,CSIR - Institute of Minerals And Materials Technology |
Bhattacharjee S.,CSIR - Institute of Minerals And Materials Technology |
Besra L.,CSIR - Institute of Minerals And Materials Technology |
Singh B.P.,CSIR - Institute of Minerals And Materials Technology |
Sinha S.P.,Kalinga Institute of Industrial Technology
Journal of the European Ceramic Society | Year: 2010
Electrophoretic deposition of doped ceria has been carried out in non-aqueous solvent to prepare coatings on different substrates and free standing films. It has been found that uneven deposition occurred in ethanol, while in butanol deposition yield is low having very little variation with deposition time. On the other hand, good deposit obtained in acetyl acetone medium, but had a porous structure. The best result however was obtained in mixed solvent. Effect of adding charge modifying additives in the ceria suspension on the deposit microstructure has been studied. Mechanism of charging in the non-aqueous medium to modify the surface properties of the suspended particles has been discussed. © 2009 Elsevier Ltd. All rights reserved.
Mandal S.,Bankura Christian College |
Rout A.K.,Kalinga Institute of Industrial Technology |
Fleck M.,University of Vienna |
Pilet G.,University Claude Bernard Lyon 1 |
And 2 more authors.
Inorganica Chimica Acta | Year: 2010
A family of four new phenoxo-bridged binuclear manganese(III) complexes of the general formula, [Mn(L)(X)]2 where L = [N,N′- bis(salicylidene)]propane-1,2-diamine and X = salicylaldehyde anion (sal -) (1); NCS- (2); NCO- (3) and [Mn(L′)(N3)]2·2C2H5OH (4) where L′ = [N,N′-bis(2-hydroxyacetophenylidene)]propane-1,2- diamine has been prepared. The syntheses have been achieved by reacting manganese perchlorate with 1,2-diaminopropane and salicylaldehyde (or 2-hydroxyacetophenone for 4) or along with the respective pseudohalides so that the tetradentate Schiff base H2L or H2L′ is obtained in situ to bind the Mn(III) ion. The complexes have been characterized by IR spectroscopy, elemental analysis, crystal structure analysis and variable-temperature magnetic susceptibility measurements. The single crystal X-ray diffraction studies show that the compounds are isostructural containing dimeric Mn(III) units with bridging phenolate oxygen atoms. Low temperature magnetic studies indicate that the complexes 1-3 exhibit intradimer ferromagnetic exchange as well as single-molecule magnet (SMM) behavior while complex 4 is found to undergo an intradimer antiferromagnetic coupling. © 2010 Elsevier B.V. All rights reserved.