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    • Several versions

    Static Numbers to Dynamic Statistics: Designing a Policy-Friendly Social Policy Indicator Framework

    Ahn, Sang-Hoon, Choi, Young, Kim, Young-Mi
    Social Indicators Research, 2012, Vol.108(3), pp.387-400 [Peer Reviewed Journal]

    • Several versions

    Feasibility study on the application of a heat-pipe type adsorption chiller

    Ahn, Sang, Kwon, Oh, Chung, Jae
    Journal of Mechanical Science and Technology, 2017, Vol.31(1), pp.421-428 [Peer Reviewed Journal]

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    A Conceptual Design of Job Pre-processing Flow for Heterogeneous Batch Systems in Data Center

    Ahn, Sang, Kim, Jin
    Wireless Personal Communications, 2016, Vol.89(3), pp.847-861 [Peer Reviewed Journal]
    Springer Science & Business Media B.V.
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    Title: A Conceptual Design of Job Pre-processing Flow for Heterogeneous Batch Systems in Data Center
    Author: Ahn, Sang; Kim, Jin
    Subject: Job processing ; Resource utilization ; Batch system ; Data center
    Description: Processing a workflow (or a job) created by a user, who can be a researcher from a scientific laboratory or an analysis from a commercial organization, is the main functionality that a data center or a high-performance computing center is generally expected to provide. It can be accomplished with a single core processor and rather small amount of memory if the problem is adequately small while it may require thousands of nodes to solve a complicated problem and peta-bytes of storage for its output. Also specific applications on various platforms are required in general by users for resolving the problems appropriately. In this aspect, a data center should operate non-homogeneous systems for resource management, so-called batch system, in which it results in inefficient resource utilization due to stochastic behavior of user activity. Implementation of virtualization for resource management, e.g. Cloud Computing, is one of promising solutions recently arising, however, it results in the increase of complexity of the system itself as well as the system administration because it naturally implies the intervention of virtualization stack, e.g. hypervisor, between Operating System and applications for resource management. In this paper, we propose a new conceptual design to be implemented as a pre-scheduler capable to insert user submitted jobs dedicated to a specific batch system into available resources managed by other kind of batch systems. The proposed design features transparency in between clients and batch systems, accuracy in terms of monitoring and prediction on the available resources, and scalability for additional batch systems. We suggest the implementation example of the conceptual design based on the scenario established from our experience of operating a data center.
    Is part of: Wireless Personal Communications, 2016, Vol.89(3), pp.847-861
    Identifier: 0929-6212 (ISSN); 1572-834X (E-ISSN); 10.1007/s11277-016-3224-x (DOI)

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    Secure and efficient high-performance PROOF-based cluster system for high-energy physics

    Ahn, Sang, Yeo, Il, Park, Sang
    The Journal of Supercomputing, 2014, Vol.70(1), pp.166-176 [Peer Reviewed Journal]
    Springer Science & Business Media B.V.
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    Title: Secure and efficient high-performance PROOF-based cluster system for high-energy physics
    Author: Ahn, Sang; Yeo, Il; Park, Sang
    Subject: Cluster system ; Large hadron collider ; PROOF ; High-energy physics
    Description: The particle detectors at the LHC produced about 25 PB data in a year, and the total size of data recorded on tape media at the CERN data center reached almost 100 PB in 2013. In order to preserve such a large-scale data safely and process them fast and efficiently, the collaboration of the data centers around the world (WLCG) was founded. The overall performance of the WLCG has strong site-dependency, and the time scale for the result is unpredictable. In this paper, we introduce PROOF developed for providing high performance and reliable environment for the user analysis task to complement the grid computing, and we provide a new Linux cluster (KIAF), by deploying PROOF. The KIAF cluster provides data access in low latency and secure connection with the clients. In order to find the correlation between the processing performance and the scalability of KIAF, we perform a simple analysis task counting the number of particles in the data on KIAF by varying the number of worker nodes from 1 to 96. We show that the linear scalability of performance of KIAF and its limitation as a function of the number of workers participating in processing.
    Is part of: The Journal of Supercomputing, 2014, Vol.70(1), pp.166-176
    Identifier: 0920-8542 (ISSN); 1573-0484 (E-ISSN); 10.1007/s11227-014-1146-5 (DOI)

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    Film squeezing process for generating oblate spheroidal particles with high yield and uniform sizes

    Ahn, Sang, Ahn, Kyung, Lee, Seong
    Colloid and Polymer Science, 2016, Vol.294(5), pp.859-867 [Peer Reviewed Journal]
    Springer Science & Business Media B.V.
    Available
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    Title: Film squeezing process for generating oblate spheroidal particles with high yield and uniform sizes
    Author: Ahn, Sang; Ahn, Kyung; Lee, Seong
    Subject: Oblate spheroid ; Film squeezing ; Uniaxial process ; Polystyrene microsphere ; Particle aspect ratio
    Description: Particle shape is one of the most important parameters that can influence the characteristics and properties of dispersion systems. In this study, we have developed a straightforward and facile method to generate oblate spheroidal particles via a film squeezing process. Representative methods so far developed to prepare oblate spheroidal particles, such as film blowing and mechanical stretching based on a biaxial process, have serious problems, including being difficult methods to adopt, very low yield, and non-uniform particle size. Our film squeezing process involves simply squeezing a sandwiched array comprised of an arbitrarily shaped film with embedded polymer spheres between two identical circular elastomeric sheets, on the basis that homogeneous deformation is possible in the mid-plane of simple squeeze flow. This method utilizes a unified uniaxial process for producing both prolate and oblate spheroidal particles. The advantages of the method are easier access, much higher yield, and more uniform sizes and shapes than previously reported methods. This process can be helpful for the fundamental studies utilizing oblate spheroidal particles with controlled geometries.
    Is part of: Colloid and Polymer Science, 2016, Vol.294(5), pp.859-867
    Identifier: 0303-402X (ISSN); 1435-1536 (E-ISSN); 10.1007/s00396-016-3838-2 (DOI)

    • Several versions

    Safety assessment of concrete expressway bridges employing probabilistic concept

    Paik, Inyeol, Ahn, Sang-Sup, Shin, Soobong
    KSCE Journal of Civil Engineering, 2013, Vol.17(3), pp.584-593 [Peer Reviewed Journal]

    • Several versions

    Numerical investigation of a pump-jet with ring rotor using an unstructured mesh technique

    Ahn, Sang, Kwon, Oh
    Journal of Mechanical Science and Technology, 2015, Vol.29(7), pp.2897-2904 [Peer Reviewed Journal]

    • Several versions

    Prediction of compressive strength of CFRP composite structures using notch strength

    Ahn, Sang, Hong, Suk, Koo, Jae, Seok, Chang
    International Journal of Precision Engineering and Manufacturing, 2013, Vol.14(6), pp.1103-1108 [Peer Reviewed Journal]

    • Several versions

    Psoralidin Stimulates Expression of Immediate-Early Genes and Synapse Development in Primary Cortical Neurons

    Hwang, Seojin, Lee, Seong-eun, Ahn, Sang-Gun, Lee, Gum
    Neurochemical Research, 2018, Vol.43(12), pp.2460-2472 [Peer Reviewed Journal]

    • Several versions

    Validity of intra-particle models of mass transfer kinetics in the analysis of a fin-tube type adsorption bed

    Hong, Sang, Ahn, Sang, Kwon, Oh, Chung, Jae
    Journal of Mechanical Science and Technology, 2014, Vol.28(5), pp.1985-1993 [Peer Reviewed Journal]