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Kulkarni S.N.,College of Applied Management | Patrikar S.R.,Visvesvaraya National Institute of Technology
Journal of Modern Optics

In the present work, electromagnetic field confinement in a subwavelength waveguide structure is obtained using concepts of quantum mechanics and uncertainty principle. Semi-macroscopic considerations of field interaction at the dielectric interfaces are used in this work. The modal field profile in the subwavelength waveguide is obtained by considering the photon as a particle in the waveguide having finite probability of tunneling. Thus, uncertainty of position is assigned to it. The momentum uncertainty is calculated from position uncertainty. Schrdinger wave equation for the photon is written by incorporating position-momentum uncertainty. The equation is solved and the field distribution in the waveguide is obtained. The field distribution and power confinement is compared with conventional waveguide theory. They were found in good agreement with each other. © 2012 Copyright Taylor and Francis Group, LLC. Source

Al-Araki M.,College of Applied Management
Journal of Intelligent and Fuzzy Systems

SWOT is a much utilized tool for identifying, gathering, interpreting and assessing internal and external data based on four key-variables (Strength, Weakness, Opportunities and Threats). Developed by Harvard Business School during the 1960 s, SWOT has been criticized on several grounds for being a top-down approach for gathering data; for creating a separation between those who think and those who do; for downplaying emergent strategies during the process of experimentation as opposed to intended strategies, and for neglecting anticipated future situations as opposed to current ones. In an attempt to remedy such weaknesses, this paper proposes two explorative frameworks similar to SWOT both in number of components and in utility. The first is PEAK where the components stand for: Power, Earnings, Artistry or Activity and Knowledge. The second is SETS where the components stand for: Solidity, Extent, Type and Segment or specialization. These two frameworks can be combined with SWOT and they can also be used separately in working with areas unrelated to SWOT. © 2013 - IOS Press and the authors. All rights reserved. Source

Dey S.,College of Applied Management | Mandal S.,Indian School of Mines
Optical Engineering

A waveguide-based wide free-spectral-range (FSR) triple ring resonator (TRR) as an optical filter has been investigated in this article. The transmittance of the TRR is presented in Z-domain. The delay line signal processing approach and Mason's gain formula have been used to develop the transmittance of the TRR. The TRR in the article is capable of providing an FSR up to 605 GHz with lower crosstalk limited within -10 dB. Another efficacious scheme of TRR with much wider FSR of 1029 GHz and with reduced unit delay length is presented in the article. Here also crosstalk, as well as resonance loss, remains within reasonable limits. The FSRs obtained using the present TRR architectures in this work are until now reported as maximum for a corresponding class of optical ring resonators. The issues of group delay and dispersion, two important parameters associated with high frequency optical communication have been addressed in this article. © 2011 Society of Photo-Optical Instrumentation Engineers (SPIE). Source

Kisperska-Moron D.,University of Economics in Katowice | Swierczek A.,College of Applied Management
International Journal of Production Economics

Modern supply chains focus on an ultimate consumer satisfaction and often require essential dynamic reconfiguration. Manufacturing companies constitute important central nodes in supply chains, where almost all physical flows are concentrated. Postponement is the operating concept, which aims at delaying activities until a customer's order has been received. The growth of interest in the postponement concept partially results from the increased demand for customized products. Data for the analysis has been collected through the survey carried out by researchers in several countries. The main research instrument used for this research was a questionnaire developed by the Global Manufacturing Research Group (GMRG). The conclusions formulated on the basis of data analysis proved that market and demand characteristics do not seem to be important for the choice between postponement and speculation strategy. The research showed that assembly postponement depends mostly on managerial decisions about the goals of company and the level of acceptance of an assembly postponement strategy on the market. Full postponement strategy is dictated mainly by the level of product customization and capacities of manufacturing and logistics systems. Production postponement has to be accepted on the market and should be associated with excellent forecasting techniques. © 2010 Elsevier B.V. All rights reserved. Source

Stresses for the elastic-plastic transition and fully plastic state have been derived for a thin rotating disc with rigid shaft at different temperatures and results have been discussed and depicted graphically. It has been observed that at room temperature rotating disc made of compressible material and of smaller radii ratio yields at the internal surface at a higher angular speed as compared to rotating disc made of incompressible material. With the introduction of thermal effect rotating disc yields at the outer surface at a lesser angular speed as compared to rotating disc at room temperature. The circumferential stress is maximum at the outer surface of the rotating disc with further increases with the increase in temperature. It means that angular speed of the rotating disc is less than that of the temperature-loaded disc in the fully plastic case. Source

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