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RISS 인기검색어
- 검색키워드
- 저자 : Roy Mahapatra (검색결과 6 건)
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D. ROY MAHAPATRA,M. WILLATZEN,R. V. N. MELNIK,B. LASSEN 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2012 NANO Vol.7 No.4
This paper presents a detailed investigation of the e®ects of piezoelectricity, spontaneous polarization and charge density on the electronic states and the quasi-Fermi level energy in wurtzite-type semiconductor heterojunctions. This has required a full solution to the coupled Schr€odinger?Poisson?Navier model, as a generalization of earlier work on the Schr€odinger ?Poisson problem. Finite-element-based simulations have been performed on a AlN/GaN quantum well by using both one-step calculation as well as the self-consistent iterative scheme. Results have been provided for ¯eld distributions corresponding to cases with zero-displacement boundary conditions and also stress-free boundary conditions. It has been further demonstrated by using four case study examples that a complete self-consistent coupling of electromechanical ¯elds is essential to accurately capture the electromechanical ¯elds and electronic wavefunctions. We have demonstrated that electronic energies can change up to approximately 0.5 eV when comparing partial and complete coupling of electromechanical ¯elds. Similarly, wavefunctions are signi¯cantly altered when following a self-consistent procedure as opposed to the partial-coupling case usually considered in literature. Hence, a complete self-consistent procedure is necessary when addressing problems requiring more accurate results on optoelectronic properties of lowdimensional nanostructures compared to those obtainable with conventional methodologies.
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Fuzzy decision-making on reliability of series system: Fuzzy geometric programming approach
G. S. Mahapatra,B. S. Mahapatra,P. K. Roy 원광대학교 기초자연과학연구소 2011 ANNALS OF FUZZY MATHEMATICS AND INFORMATICS Vol.1 No.1
In this paper, we have presented different type of fuzzy geometric programming based on fuzzy decision-making through max-min and max-additive operators. These operators are applied in the series system reliability model in fuzzy environment. In the problem we have considered reliability of series system with limited system cost as a constraint function. Numerical examples are given to illustrate fuzzy decision-making based fuzzy geometric programming on series system reliability model.
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Shoreline change detection along the coast of Odisha, India using digital shoreline analysis system
Santanu Roy,Manik Mahapatra,Abhishekh Chakraborty 대한공간정보학회 2018 Spatial Information Research Vol.26 No.5
A long-term shoreline change analysis is significant for coastal zone management as well as planning for future development in the coastal zone. The present study analyse a long term (1990–2015) shoreline change along the Odisha coast, India using geo-informatics. The High Water Line (HWL) was considered as shoreline, which was detected by Modified Normalized Difference Water Index (MNDWI) method. The shorelines as vector were extracted from binary raster image which was created by dynamic local threshold values. The shoreline has been updated in river creeks, mouth. Digital Shoreline Analysis System (DSAS) developed by USGS, as Arc GIS extension, were used to calculate shoreline change rate. The Linear Regression Rate method was used to calculate shoreline change rate. The result reveals that about 196 km (46%) shoreline is eroded, where 78 km (18%) shoreline is in stable condition and 156 km (36%) shoreline is accreted along the Odisha coast. The Puri and Kendapara districts have found with most eroded shoreline 80 km (18.7%) and 41 km (9.5%) respectively, whereas most accreted shoreline is around 37 km (8.5%), has found along the coast of Bhadrak district. On the other hand Ganjam district has the least eroded shoreline, which is around 8 km (2%), whereas the least accreted shoreline has found along the coastline of Puri district (5%). The study has done on the regional scale with significant information, which can help coastal managers and researchers towards sustainable coastal zone research, management and planning.
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Incidental Mesenteric Paraganglioma: A Case Report and Literature Review
Jennie Granger,Dale Vimalachandran,Roy Mahapatra,Bushra Hamid,Katherine Gillespie,Matthew Fok 대한대장항문학회 2017 Annals of Coloproctolgy Vol.33 No.5
Mesenteric paragangliomas are a rare entity; consequently, only 12 cases have been reported to date. Although considered benign and often found incidentally, they have the potential to metastasize and are an important diagnosis to consider for patients with a mesenteric tumor. We report the case of a 71-year-old woman who was found on magnetic resonance imaging to have an incidental, large, complex, intra-abdominal mass that had initially been misdiagnosed as ovarian in origin. She underwent an open resection of the tumor and adjacent small bowel with no perioperative complications; histology confirmed the mass to be a mesenteric paraganglioma. This case report highlights several important key issues regarding paraganglioma, including diagnosis, imaging, genetic testing, and surgical resection. The results of a literature review are also discussed.
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Sutrakar, Vijay Kumar,Subramanya, N.,Mahapatra, D. Roy Techno-Press 2015 Advances in nano research Vol.3 No.3
Initiation of crack and its growth simulation requires accurate model of traction - separation law. Accurate modeling of traction-separation law remains always a great challenge. Atomistic simulations based prediction has great potential in arriving at accurate traction-separation law. The present paper is aimed at establishing a method to address the above problem. A method for traction-separation law prediction via utilizing atomistic simulations data has been proposed. In this direction, firstly, a simpler approach of common neighbor analysis (CNA) for the prediction of crack growth has been proposed and results have been compared with previously used approach of threshold potential energy. Next, a scheme for prediction of crack speed has been demonstrated based on the stable crack growth criteria. Also, an algorithm has been proposed that utilizes a variable relaxation time period for the computation of crack growth, accurate stress behavior, and traction-separation atomistic law. An understanding has been established for the generation of smoother traction-separation law (including the effect of free surface) from a huge amount of raw atomistic data. A new curve fit has also been proposed for predicting traction-separation data generated from the molecular dynamics simulations. The proposed traction-separation law has also been compared with the polynomial and exponential model used earlier for the prediction of traction-separation law for the bulk materials.
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