• 해운
• /
• no.1 s.47
• /
• pp.14-22
• /
• 2008

최근들어 1만TEU급 초대형 컨테이너선이 잇따라 시장에 투입되면서 선복과잉이 우려되고 있다. 과연 메가급 컨테이너선이 규모경제의 잇점을 살릴 수 있을지, 아니면 메가급 위기로 다가올지 기대와 우려가 교차되고 있다. 다음은 로이즈 쉬핑 에코노미스트(Lloyd's Shipping Economist)지 2007년 10월호에 실린 스테판 메튜(Stephen Matthews)의 "Mega-risk"를 번역한 것이다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2023.05a
• /
• pp.175-175
• /
• 2023

해상구획선의 정밀도는 연안에서의 법 집행, 경제권, 해양환경 보호와 밀접한 연관이 있다. 하지만 기술적 한계로 인해 일정 수준의 오차가 존재한다. 이 연구에서는 각 분야 마다 분쟁 가능성을 살펴보고 대응방안에 대한 제안하였다.

• Proceedings of the Korean Society of Propulsion Engineers Conference
• /
• 1996.05a
• /
• pp.131-137
• /
• 1996

HTPB/AP/Al이 주성분인 2종의 혼합형 추진제를 대상으로 4종의 금속선(Ag, Cu, Al, Ni-Cr)윰 각각 삽입하여 금속선의 직경(0.1~0.8mm)과 연소 압력에 따른 금속선에 인접한 고체 추진제의 연소 속도 증가비($r_w$/$r_sb$)와 압력 지수(n)의 변화를 고찰하였다. 금속선을 추진제에 삽입함으로써 추진제의 $r_w$/$r_sb$ 는 크게 중가하였고, 1000 psia의 압력에서의 최대 6.59배 증가하였다. 그러나 녹는 점이 비교적 낮은 Al 선이나 Ag선은 금속선 직경이 작아짐에 따라 한계 직경에서 $r_w$가 급격히 감소하는 최대값이 존재하였다. 자연 발화 온도와 금속선으로 전달되는 열원인 연소 기체 불꽃 온도로 구성된 무차원군을 Buckingham pi 정리에 의해 구해진 $r_w$/$r_sb$ 에 대한 기존의 무차원 실험식에 추가로 적용하여 계산해 본 결과, 자연 발화 온도는 고려하지 않고 금속선의 녹는 점과 연소 기체의 불꽃 온도를 무시한 Hsing 의 실험식에 의해 계산된 결과보다 표준 편차가 45%이상 줄어듬을 알 수 있었다.

• Journal of the Korean Chemical Society
• /
• v.29 no.4
• /
• pp.382-389
• /
• 1985

The effect of plasma operational parameters for the determination of rare earth elements(REE) by means of inductively coupled plasma(ICP) spectrometry was investigated. While the increase in the flow rate of carrier gas argon enhanced the sensitivity and lowered the detection limit, significant ionization interferences were observed. The decrease in RF power increased the signal to background ratio. The observation point showing the lowest ionization interference was slightly higher than the position where the spatial profile of the analyte reached the maximum. The detection limits of the spectral lines commonly used for the determination of REE were measured and the spectral lines relatively free from spectral interferences were chosen.

• Proceedings of the Korean Radioactive Waste Society Conference
• /
• 2005.11a
• /
• pp.301-306
• /
• 2005

The possibility and limitation of one dimensional nano scale electron shielder is briefly discussed. A Nano scale electron shielder will reduce the weight and size of shielding materials. However, practical application still requires further research. In this work, we discuss general problems related to nano scale electron shielder, by taking an arbitrary one dimensional potential barrier as an example.

• Applied Biological Chemistry
• /
• v.13 no.3
• /
• pp.261-268
• /
• 1970

1. A-value in the soils studied in this experiment were found to be about 40-50kg/10a (as $P_2O_5$) 2. Percentage of utilized phosphorus in Soybeans was 10%. 3. The utilization and A-value of phosphorus were very different among the varieties of soybean plants, and the range was about 30%. 4. A/M-value (A means maximum value of total amount of available phosphorus and M means minimum value of absorbed phosphorus by plants from soils) indicated the critical range of available phosphorus to the crops.

• Proceedings of the Korean Society of Fisheries Technology Conference
• /
• 1996.06a
• /
• pp.41.1-44
• /
• 1996

• Proceedings of the Korean Nuclear Society Conference
• /
• 1999.05a
• /
• pp.73-73
• /
• 1999

• Proceedings of the Zoological Society Korea Conference
• /
• 1997.10b
• /
• pp.173.1-173
• /
• 1997

• Journal of the Earthquake Engineering Society of Korea
• /
• v.15 no.3
• /
• pp.65-72
• /
• 2011

Extensive computer simulations to account for the randomness in the process of seismic demand estimation have been a serious obstacle to the adoption of probabilistic performance assessments for the decision of applying seismic intervention schemes. In this study, a method for rapid fragility assessments based on a response database and the fragility contour method are presented. By the comparison of response contours in different formats, it is shown that representing maximum responses in ductility demand is better for the investigation of the effect of structural parameter changes on seismic demands than representations in absolute values. The presented fragility contour enables designers to practically investigate the probabilistic performance level of every possible retrofit option in a convenient manner using visualized data sets. This example demonstrates the extreme efficiency of the proposed approach in performing fragility assessments and successful application to the seismic retrofit strategies based on limit state probabilities.