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151 results on '"Kang, So Min"'

2. Enhanced Thermoelectric Properties in Highly Co-Doped Bi2Se3 by Density-of-State Effective Mass Increase.

Author

Kang, Seung Min, Lee, Kyu Hyoung, Roh, Jong Wook, Cho, Hyungyu, Park, Sanghyun, Park, Joontae, and Kim, Sang-il

Subjects
*DOPING agents (Chemistry), *CARRIER density, *ELECTRIC conductivity, *PHONON scattering, *THERMAL conductivity
Abstract

Bi2Se3 alloys are promising thermoelectric materials for use at near room temperature. In this study, we investigated the thermoelectric transport properties of Co-doped Bi2Se3, Bi2−xCoxSe3 (x = 0 , 0.03, 0.06, 0.09, and 0.12) polycrystalline alloys. The electrical conductivity of Bi2Se3 increased with Co doping as the electron concentration increased. The power factor increased by 83% (1.17 mW/mK2) with the Co doping compared with 0.64 mW/mK2 for pristine Bi2Se3 at room temperature. The density-of-states effective mass significantly increased to 0.30 m 0 (free electron mass) by high Co doping of x =0.12 compared to 0.14 m 0 for pristine Bi2Se3. The total thermal conductivity of the Co-doped samples increased owing to the increase in electronic thermal conductivity, despite the systematic decrease in the lattice thermal conductivity caused by Co doping due to additional phonon scattering. Nevertheless, an enhancement in z T was observed for all the Co-doped samples. The maximum z T value of 0.39 in highly Co-doped Bi1.88Co0.12Se3 is observed at 520K, which is 18% higher than that of pristine Bi2Se3. The z T value of the Co-doped sample could be further increased with the decrease in carrier concentration, which could be attained with the decrease in total thermal conductivity owing to the decreased electronic thermal conductivity while maintaining a high power factor originating from the increased effective mass. [ABSTRACT FROM AUTHOR]

Published
2024
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5. Hadamard-Type k-Fractional Integral Inequalities for Exponentially α,h−m-Convex Functions

Author

Jung, Chahn Yong, Farid, Ghulam, Bibi, Sidra, Nisar, Kottakkaran Sooppy, and Kang, Shin Min

Subjects
Article Subject, QA1-939, Mathematics
Abstract

The class of exponentially α,h−m-convex functions has been discovered to unify different kinds of convexities. This paper finds new Riemann–Liouville fractional Hadamard-type inequalities for this generalized class of convex functions. These results further have their consequences which are presented in the form of corollaries. Moreover, some known results are identified in the form of remarks.

Published
2020

13. Refinements of Some Integral Inequalities for s,m-Convex Functions.

Author

Farid, Ghulam, Chu, Yu-Ming, Andrić, Maja, Jung, Chahn Yong, Pečarić, Josip, and Kang, Shin Min

Subjects
INTEGRAL inequalities, INTEGRAL operators, FRACTIONAL integrals, CONVEX functions
Abstract

In this paper, the refinements of integral inequalities for all those types of convex functions are given which can be obtained from s , m -convex functions. These inequalities not only provide refinements of bounds for unified integral operators but also for various associated fractional integral operators containing Mittag–Leffler function. At the same time, presented results give generalizations of many known fractional integral inequalities. [ABSTRACT FROM AUTHOR]

Published
2020
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22. Convergence Analysis of Parallel S-Iteration Process for System of Generalized Variational Inequalities.

Author

Sahu, D. R., Kang, Shin Min, and Kumar, Ajeet

Subjects
*STOCHASTIC convergence, *ITERATIVE methods (Mathematics), *GENERALIZED spaces, *VARIATIONAL inequalities (Mathematics), *HILBERT space
Abstract

We consider a new system of generalized variational inequalities (SGVI) defined on two closed convex subsets of a real Hilbert space. To find the solution of considered SGVI, a parallel Mann iteration process and a parallel S-iteration process have been proposed and the strong convergence of the sequences generated by these parallel iteration processes is discussed. Numerical example illustrates that the proposed parallel S-iteration process has an advantage over parallel Mann iteration process in computing altering points of some mappings. [ABSTRACT FROM AUTHOR]

Published
2017
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23. On a System of Nonlinear Variational Inclusions with Hh,η-Monotone Operators

Author

Liu, Zeqing, Ume, Jeong Sheok, and Kang, Shin Min

Subjects
Article Subject, lcsh:Mathematics, lcsh:QA1-939
Abstract

This paper is concerned mainly with the existence and iterative approximation of solutions for a system of nonlinear variational inclusions involving the strongly Hh,η-monotone operators in Hilbert spaces. The results presented in this paper extend, improve, and unify many known results in the literature.

Published
2012

31. The equivalence between the convergences of Mann and Ishikawa iteration methods with errors for demicontinuous φ-strongly accretive operators in uniformly smooth Banach spaces

Author

Liu, Zeqing, Wang, Li, Ume, Jeong Sheok, and Kang, Shin Min

Subjects
lcsh:Mathematics, lcsh:QA1-939
Abstract

We investigate the equivalence between the convergences of the Mann iteration method and the Ishikawa iteration method with errors for demicontinuous φ-strongly accretive operators in uniformly smooth Banach spaces. A related result deals with the equivalence of the Mann iteration method and the Ishikawa iteration method for φ-pseudocontractive operators in nonempty closed convex subsets of uniformly smooth Banach spaces. The results presented in this paper extend and improve the corresponding results in the literature.

Published
2006

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