Search Results - (Author, Cooperation:J. Seok)

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  1. 1
    S. Cho ; S. Kim ; J. H. Kim ; J. Zhao ; J. Seok ; D. H. Keum ; J. Baik ; D. H. Choe ; K. J. Chang ; K. Suenaga ; S. W. Kim ; Y. H. Lee ; H. Yang
    American Association for the Advancement of Science (AAAS)
    Published 2015
    Staff View
    Publication Date:
    2015-08-08
    Publisher:
    American Association for the Advancement of Science (AAAS)
    Print ISSN:
    0036-8075
    Electronic ISSN:
    1095-9203
    Topics:
    Biology
    Chemistry and Pharmacology
    Computer Science
    Medicine
    Natural Sciences in General
    Physics
    Published by:
    http://www.aaas.org/

    Latest Papers from Table of Contents or Articles in Press
  2. 2
    Staff View
    Publication Date:
    2018-07-29
    Publisher:
    MDPI Publishing
    Print ISSN:
    1661-7827
    Electronic ISSN:
    1660-4601
    Topics:
    Energy, Environment Protection, Nuclear Power Engineering
    Medicine
    Published by:
    http://www.mdpi.com/

    Latest Papers from Table of Contents or Articles in Press
  3. 3
    Seok, J. H. ; Kim, J. Y.

    Woodbury, NY : American Institute of Physics (AIP)
    Published 2001
    Staff View
    ISSN:
    1077-3118
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    The radiative recombination peaks over a broad energy range of 0.75–0.9 eV have been observed by photoluminescence spectroscopy in self-assembled Ge/Si quantum dot structures. In order to clarify the broadness of the peak distribution, we have investigated the electronic structure of an approximate model by taking the profiles of strain components at atomic positions into account. The three-dimensionally confined levels are then obtained by diagonalizing the Hamiltonian matrix of the Schrödinger equation based on strain-modified potential. Theoretical results compared with the observed recombination energies verify that significant interdiffusion between a Si capping layer and a Ge dot takes place. This is also consistent with recently reported experimental results. © 2001 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.1357810

    Articles: DFG German National Licenses
  4. 4
    Lee, Chae Y. ; Kim, Seok J. ; Park, Taehoon
    Springer
    Published 2000
    Staff View
    ISSN:
    1572-9451
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Electrical Engineering, Measurement and Control Technology
    Notes:
    Abstract Multi‐layered location registration areas are considered to minimize the control signals at boundary cells in the microcellular systems. The decision of multi‐layered location registration (LR) areas is formulated as an integer programming problem by examining the regional subscriber densities, traffic flows and call arrival rates. By relaxing the constraints of forward and reverse control channels the problem is decomposed into a number of subproblems each of which corresponds to a layer. Each subproblem is solved via a modified graph partitioning algorithm. Feasible LR areas are obtained by considering the two relaxed constraints. Computational experiments are performed in a system with 80 microcells to investigate the performance of the proposed multi‐layer scheme. The simulation results indicate that the two‐layer scheme generally outperforms the one‐layer and three‐layer methods in view of control signals.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1023/A:1019185215847

    Articles: DFG German National Licenses
  5. 5
    Lee, Chae Y. ; Eun, Hee M. ; Koh, Seok J.
    Springer
    Published 2000
    Staff View
    ISSN:
    1572-9451
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Electrical Engineering, Measurement and Control Technology
    Notes:
    Abstract This paper considers VBR transmission of multiple real‐time videos over ATM networks. Multiple real‐time VBR video sources are multiplexed into an ATM switch to transmit cells into the network. Given the ATM switch capacity, the problem is to dynamically allocate the required channel bandwidth for each video source such that the encoder buffer occupancy is maintained at a target level. To solve the problem, we present a mathematical formulation and propose an algorithm for the bandwidth allocation. To allocate a suitable bandwidth at a given control period, QoS demand levels and traffic characteristics of the video sources are considered. The performance of the proposed scheme is examined in terms of the number of encoder rate controls required and the gap between the target and the current buffer occupancy at each control period. Numerical results are analyzed for different QoS environments as well as different levels of target buffer, ATM switch capacity, buffer size and leaky bucket token rate.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1023/A:1019107315363

    Articles: DFG German National Licenses