• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.864-865
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• 2011

Battery Disconnecting System (BDS) is the important equipment in electric vehicle system. Therefore, most of electric vehicle companies, i.e. Hyundai Motors, Renault Motors, General Motors, want to have the reliability of 15 years - 150, 000 miles. Recently, reliability prediction through Siemens Norm SN 29500 is considered without testing. In this paper, we will introduce the standard and various input parameters. Also the case study will be shown for BDS. Prediction model is constructed by listing all the components of BDS. It calculates the $\pi$ factors for each components using the conversion equation in the standard and converts the reference failure rates to the expected operating failure rates. According to the result, the parts which will be improved are EV-Relays.

• Journal of the Korean Society of Marine Environment & Safety
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• v.7 no.2
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• pp.13-22
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• 2001

We studied the characteristics of marine casualties within the area under control of Korea National Maritime Police and leeway of drifting vessel. According to 5 years＇(1995~1999) data of casualties, it was found that the occurrence of casualties by fishing boats ranked the highest and a considerable numbers of casualties took place more than 20 miles off the shore. From a result of field experiment of G/T 50 tons vessel off Busan harbor on Apr. 26~28, 2000, we computed that the linear equation of leeway speed(cm/s) was 1.01$\times$U(U : wind speed in m/s)+11.36 with correlation coefficient between wind speed and leeway speed being 0.252 and we found leeway angle range from $+87^{\circ}$(right) to $-78^{\circ}$(left ) of the downwind direction.

• Journal of Ocean Engineering and Technology
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• v.10 no.3
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• pp.96-104
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• 1996

Hamilton's principle is used to derive Euler-Lagrange equations for free surface flow problems of incompressible ideal fluid. The velocity field is chosen to satisfy the continuity equation a priori. This approach results in a hierarchial set of governing equations consist of two evolution equations with respect to two canonical variables and corresponding boundary value problems. The free surface elevation and the Lagrange's multiplier are the canonical variables in Hamilton's sense. This Lagrange's multiplier is a velocity potential defined on the free surface. Energy is conserved as a consequence of the Hamiltonian structure. These equations can be applied to waves in water of finite depth including generalization of Hamilton's equations given by Miles and Salmon.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2003.05a
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• pp.546-550
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• 2003

For dual-band operation, it can be done by loading two pair of narrow slots in the equilateral-triangular patch, one embedded close to the side edges of the patch and the other inserted at the bottom edge of the patch. The obtained two operating frequencies are of same polarization planes. The frequency ratio of the two operating frequencies is turnabled by varing the positions and lengths of the inserted slots at the bottom edge of the patch. In this paper, A single-feed equilateral-triangular microstrip patch with two pairs of narrow slot for dual-frequency operation is printed on the substrate(TMN-4 Rosers Co.) of the 60 miles. the antenna radiation characteristics are calculated by Ensemble ver. 5.0 software, and compared with the experimental results.

• Proceedings of KOSOMES biannual meeting
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• 2006.05a
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• pp.41-45
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• 2006

From the 1978 Seasat synthetic aperture radar(SAR) to present systems, spaceborne SAR has demonstrated the capability to image the Earth's ocean and land features over broad areas, day and night, and under most weather conditions. The application of SAR for surveillance of commercial fishing grounds can did in the detection of illegal fishing activities and provides more efficient use cf limited aircraft or patron craft resources. In the area of vessel traffic monitoring for commercial vessels, Vessel Traffic Service (VTS) which uses the ground-based radar system has some difficulties in detecting moving ships due to the limited detection range cf about 10 miles. This paper introduces the field testing results of ship detection by RADARSAT SAR imagery, and proposes a new approach for a Vessel Monitoring System(VMS), including VTS, and SAR combination service.

• Transactions of the Korean Society of Automotive Engineers
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• v.10 no.5
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• pp.129-137
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• 2002

Elastomers, which are used engine mounts and body mount rubbers, are traditionally designed for NVH use in vehicles, and for vibration isolation in specific frequency range. According to the measurement of the characteristics of the SUV's engine mounts, there are variability in same engine mount properties. Static and dynamic stiffness of the SUV's engine mounts are changed due to the driving miles accumulated. The pre-load of body mount rubbers are changed due to the empty vehicle weight, passenger's weight and gross vehicle weight. And the dynamic stiffness of body mount rubbers are changed very hard above 150Hz frequency range.

• Proceedings of the KAIS Fall Conference
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• 2010.11b
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• pp.624-627
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• 2010

20세기 재즈의 흐름에서 특히 주목할 만한 인물은 마일즈 데이비스로 그의 독창적인 시도와 새로운 접근방식은 현대 음악에도 많은 영향력을 발휘하고 있다. 어느 분야에서건 그 흐름을 주도하는 인물들은 시대적 배경과 무관하지 않다. 흐름을 주도한다는 것은 현재 없던 것을 새로이 선보인다는 개념이 아니라 과거에 있었던 것을 다르게 접근, 발전시킨다는 것이 타당할 것이다. 이 연구에서는 마일즈 데이비스가 보여주었던 수많은 시도 중에서 Nefertiti 라는 특정 곡을 중심으로 20세기 초에 에즈라 파운드를 중심으로 영국과 미국에서 형성되었던 이미지즘과의 연관성을 논하고자 한다. 음악과 문학은 항상 그 시대의 흐름과 무관하지 않았고 독창적인 예술가와 작가의 세계를 연결시켜보는 것 또한 커다란 의미가 있으리라 본다.

• Proceedings of the KAIS Fall Conference
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• 2011.05b
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• pp.626-628
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• 2011

문학과 음악처럼 다른 두 예술 분야에서는 필연적으로 발생하는 시대별 표현방법의 변화에서 공통점이 발견되기 마련이다. 시기적으로는 고전주의적 표현에서 낭만주의적 표현으로의 변화를 겪은 18-19 세기 영, 미 문학의 표현 형태와 20세기 중반 미국재즈의 획기적인 표현방법상의 변화에서 공통점을 발견할 수 있다. 1846년, 제약과 규범의 틀을 탈피한 인간 중심의 자기 주도적 표현 방식을 보인 낭만주의적 성향이 만연한 시기에 모든 창작은 계산에 의해 나와야한다는 에드거 앨런 포우의 한 비평문이 소개된다. 신고전주의적 사상의 출발로 볼 수 있을 정도인 이 비평문에서 포우는 작가의 순간적 감정을 자제시키면서 창작은 사전 준비에 의해서만 행해져야한다는 주장을 한다. 이 연구는 포우가 비평문을 통하여 주장하는 사상을 마일즈 데이비스의 작품 속에서 의도적 창작의 개연성을 연계하여 유추하는 것에 중심을 둔다.

• Journal of Biomedical Engineering Research
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• v.10 no.3
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• pp.279-284
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• 1989

Measurement of cardiac output during exercise by noninvasive technique is very needed in the area of sports medicine. However there are only two noninvasive techniques, one of which is $CO_2$ subscript rebreathing technique and the other one is impedance cardiography. While $CO_2$ rebreathing technique needs special breathing and metablic steady state, impedance cardiography has motion Uiiau problem. In this study maior sources of the mothion artifact during treadmill exercise was found experimentally to. be the impact caused by each step on the treadmill. Thus special shoes to reduce the impact were developed. These are the shoes with silicon rubber and hard sponge attached to the soles. It was possible to measure cardiac output with the newly developed shoes for Burke protocol whose speed of the treadmill was constant 3.5 miles/hour while it was impossibel with the conventional exercise shoes.

• Proceedings of the Korea Technology Innovation Society Conference
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• 2017.05a
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• pp.219-219
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• 2017

This study aims at examining each firm's decision-makings of complex product and system (hereafter CoPS) innovation strategy, so that it tries to reveal the nature and role of CoPS innovations strategy. And it designed a comparative case study along with qualitative methods, by having two mobile operators' digital rights management (hereafter DRM) innovation in South Korea's digital music service industry. Through literature review, this study formulated three research propositions: (i) Each firm's decision-makings of CoPS innovations strategy are analytical negotiation process among economic actors in an industry; (ii) Each firm's market power originated from its market share from the installed base through network effect and switching cost influence decision-makings of CoPS innovation strategies; (iii) Each firm's decision-makings of different CoPS innovation strategies are related to their intension of achieving better market power, consequently dominant design. Through empirical examination of two mobile operators' decision-makings of DRM innovation strategy, this study empirically verified three research propositions.