• Proceedings of the Korea Concrete Institute Conference
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• 2001.11a
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• pp.665-668
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• 2001

Generally, according to rising of atmospheric temperature, a consistency of concrete decreases, and a slump property of concrete is changed to be large. Also, in the strength development of concrete, the strength development rate of long-term age(28day) in comparison to strength of early age(7day) and the absolute compressive strength decreases. Accordingly, in this study, experiments about quality evaluation of concrete utilizing Ordinary Portland Cement is carried out. As a result of experiments, there were a conspicuous change in slump of concrete due to temperature increase. In conclusion, the rising of atmospheric temperature was very important factor in affecting the quality fluctuation of hot weather concrete.

• Proceedings of the KIEE Conference
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• 2003.04a
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• pp.412-414
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• 2003

Communication based train control system is applied regularly worldwide. And this system may be used in domestic soon. Communication based train control system does not depend on conventional track circuit. Therefore, position and distance control of train to prevent collision with leading train may become important safety factor. This paper developed collision avoidance algorithm to control trains of several units efficiently for this. In developing a collision avoidance algorithm, it is desirable to avoid the need for additional system. Additional system restricts the development of the algorithm by limiting the effectiveness of the algorithm to only those areas where the additional system can be afforded and has been installed.

• Korean Journal of Human Ecology
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• v.12 no.4
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• pp.449-462
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• 2003

The purpose of this study was to investigate the effect of the environmental factors on the life-positioning and the self-concept of adolescents from the military families. Subjects were 75 male and 92 female students from Y-middle school in Kye-Ryong city. The results of this study were as follows: First, the life-positioning was influenced by the scholastic achievement of an adolescent and father's rank. Second, the self-concept was influenced by the gender, the order of birth, the scholastic achievement of an adolescent and parent's age, social economic status, and father's rank. Finally, the self-concept of an adolescent was influenced by one's life-positioning.

• Journal of the Korea Institute of Military Science and Technology
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• v.18 no.5
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• pp.566-573
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• 2015

The most important factor for the penetration performance of shaped charge is the liner design. By designing the liner to have properties of both high jet tip velocity and long jet break-up time, the better penetration performance could be acquired. Usually it is very difficult to satisfy above two conditions simultaneously. In this study, the liner with the shape of ogive was developed to have relatively larger jet mass compared to the conventional trumpet liner. The designed shaped charge showed jet properties with high jet tip velocity and long jet break-up time by using ogive liner and wave shaper. A commercially available hydro-dynamic code AUTODYN-2D was used for numerical analysis of jet formation. The flash X-ray test and the static penetration test were conducted to verify the results of numerical analysis.

• Journal of Navigation and Port Research
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• v.34 no.7
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• pp.595-601
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• 2010

This paper aims to diagnose the strategy execution ability and to provide corresponding measures for Korean oceanic shipping companies. The analysis method is the t-test between importance awareness and Corresponding ability for strategy execution diagnosis index(XPP). According to the diagnosed results, the strategy development is unsatisfactory because the strategy implemented does not adhere to concurrent environmental change. Moreover, the execution of the strategy is also unsatisfactory. Therefore, an evaluation shows that there is a need for a SWOT analysis using BSC, an organization structure to strengthen the strategy execution ability and the support from the market condition analysis prediction center.

• Journal of information and communication convergence engineering
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• v.9 no.5
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• pp.597-601
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• 2011

As researches of on scientific technology are considered as a pivotal factor of a national competitiveness, the central and local governments have extended assistance for commercialization-linked technology development (CLTD) and accordingly various outputs are coming out now. However, the valuable findings from painstaking researches are not sufficiently distributed to or shared with other governmental and public organizations, and businesses. As a result, it could be possible for them to become unknown and unused. Therefore, it is being sensed that a measure to coordinately and systematically manage the information and outputs derived from the research projects is urgently needed. Hence, this study designs PIMS to manage CLTD efficiently and transparently.

• Journal of Korean Society for Quality Management
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• v.32 no.4
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• pp.184-195
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• 2004

Current companies 집중 on how to operate and select projects to achieve the best result. 6sigma projects are chosen in the best suitable concept, which are solved by the 6Sigma experts according to the priority. And every project has to be launched not the view of individual management factors but the total factors, Big Y. Therefore, a process needs to be treated to connect the vital few factors in various processes to improve the yield, which is the main performance criteria in a manufacturing industry This report is to make the total optimization through the Vital-Few mapping between quality characteristics and process factors in a manufacturing line. Accordingly, it means to secure lower variance by making the CTP(Critical To Process) optimization and finally to improve the yield.

• Progress in Superconductivity
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• v.4 no.2
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• pp.184-188
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• 2003

Voltage-current characteristics of High Temperature Superconductor(HTS) tapes after applying the current beyond their critical current was investigated. When over-current is applied, the current begins to flow through the metal sheath instead of superconductor. The HTS tapes quenched were analyzed using V-I curve with various magnitudes of current. Two kinds of tapes were compared with each other to examine the influence of critical current on quench development. As a result, it was found that the resistance of superconductors and joule heat due to the over-current affect current distribution in HTS tapes. Critical current of HTS tapes was considered as a main factor deciding over-current characteristics.

• East Asian Economic Review
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• v.24 no.1
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• pp.89-124
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• 2020

Even with the sizable Foreign Exchange (FX) holdings and good credit ratings of its top assets, Asia remains vulnerable to various shocks. This paper highlights the limited cross-border asset pledgeability as a significant factor for the lingering vulnerability in Asia. The dichotomy in asset holdings between pledgeable FX and non-pledgeable domestic assets in major economies in Asia has been the source of increasing stabilization costs as well as weakened market momentum in the region. Specifically, the peculiar feature of asset holdings in Asia reflects seriously deficient cross-border asset pledgeability that is left unaddressed. Asset pledgeability contributes toward financial stability via three channels: 1) capital market development by recognizing the role of collateral, 2) increased shock absorption capacity via collateral management, 3) and the newly activated safe asset provision. Therefore, it is crucial to go beyond the usual market development strategy and expand the overall asset pledgeability in the region that has remained unduly depressed.

• Proceedings of the KIEE Conference
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• 1992.07b
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• pp.1048-1051
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• 1992

The design method is a crucial factor for the successful operation of photovoltaic system. A design method is proposed and applied practically to a stand-alone system of 25KWp aimed at the power supply for a remote-island. In this paper the operation results of this system are discussed. In addition, the current status and future prospects at home and abroad on the development of photovoltaic systems are also described.