• 대한조선학회지
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• 제37권3호
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• pp.32-46
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• 2000

본고에서는 1912년 타이타닉호의 침몰사고 이후 도입된 구획 및 손상복원성규칙의 개정현황, 1987년 herald of Free Enterprise 호와 1994년 Estonia 호의 Ro-Ro Space 해수유입으로 인한 침몰사고 이후 도입된 잔존 복원력 요건 및 Ro-Ro Passenger Ship의 강화 규정을 요약하였다. 또한 IMO 혐약 내의 모든 손상복원성 류칙을 확률론적인 방법으로 통합하기 위하여 IMO SLF (복원성, 만재홀수선 및 어선안전 소위원회)에서 진행중인 HArmonization 작업과 이에 중대한 영향을 미칠 것으로 예상되는 EU(유럽연합) Consortium Project 인 "Harmonization of Rules and Design Rationale(HARDER)" 에 대한 현재까지 의 동향을 요약하였다. 그리고, 부록으로서 방화 및 구명 설비에 대한 협약개정동향을 수록하였다.동향을 수록하였다.

• ETRI Journal
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• 제37권6호
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• pp.1055-1064
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• 2015

We demonstrate a next-generation high-capacity mobile fronthaul based on radio over fiber (RoF) technology, which links between a digital unit and a radio unit supporting two frequency assignments and $2{\times}2$ multiple input, multiple output antennas. To confirm the technical feasibility of a mobile fronthaul, we experimentally investigate its down- and uplink end-to-end performances including the optical and radio frequency (RF) signal path. Frequency-dependent performance deviations, error vector magnitude variations, overall system performance variations caused by optical to electrical conversion, and intermediate frequency to RF conversions are examined. Experimental verifications on multiple LTE uplink signals are performed for the first time. We also demonstrate several commercial mobile Internet services, YouTube video streaming, and file transfers using off-the-shelf mobile devices, through a mobile fronthaul based on RoF.

• Journal of Communications and Networks
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• 제16권4호
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• pp.421-429
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• 2014

We consider the problem of scheduling communications in wireless sensor networks (WSNs) to ensure battery preservation through the use of the sleeping mode of sensors.We propose a communication protocol for 1-hop WSNs and extend it to multi-hop WSNs through the use of a 1-hop clustering algorithm.We propose to schedule communications in each cluster in a virtual communication ring so as to avoid collisions. Since clusters are cliques, only one sensor can speak or listen in a cluster at a time, and all sensors need to speak in each of their clusters at least once to realize the communication protocol. We model this situation as a mathematical program.

• East Asian Economic Review
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• 제22권1호
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• pp.3-28
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• 2018

This article discusses the deadlock in the WTO on multilateral harmonization of nonpreferential rules of origin (RoO) and reviews some of the RoO included in recent preferential trade agreements. We argue that there is a trend towards adoption of similar approaches and that this suggests that cooperation to reduce the trade-impeding effects of differences in RoO across jurisdictions is more feasible than often is assumed by observers and policymakers. From a trade facilitation perspective such cooperation could be based on plurilateral initiatives under the umbrella of the WTO. These could include a focus on pursuit of greater convergence between preferential and nonpreferential RoO helping to achieve the long-standing goal of moving towards harmonization of rules of origin.

• Journal of Ship and Ocean Technology
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• 제5권1호
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• pp.14-29
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• 2001

Concept and preliminary structural design methods, including large scale FEM analysis and optimisation, for large passenger ships, car passenger and RoRo/ passenger ships are dis-cussed. Applications and experiences in practical design usage are presented.

• 원자력산업
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• 제28권12호
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• pp.85-98
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• 2008

• 한국막학회:학술대회논문집
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• 한국막학회 2002년도 추계 총회 및 학술발표회
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• pp.170-173
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• 2002

• 한국재료학회:학술대회논문집
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• 한국재료학회 2002년도 추계학술발표강연 및 논문개요집
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• pp.162-162
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• 2002

• 자원리싸이클링
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• 제17권6호
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• pp.3-9
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• 2008

유해물질 제한지침(Restriction of Hazardous Substances Directive, RoHS)로 알려진 특정 유해물질 사용에 관한 규제는 2003년 2월 유럽 연합에서 시행되었다. RoHS는 2006년 7월 1일부터 효력을 발휘하며 이를 위해서는 유럽연합 소속국가에서 법령을 제정하여야 한다. 이 지침은 다양한 전기전자기기의 제조에 있어서 6가지 유해물질의 사용을 제한한다. 이것은 대량 발생하고 있는 유해한 전자기기 폐기물 문제를 해결하기 위해 발의된 법안의 일부이며, 전자제품 재활용에 관한 폐전자기기처리지침(Waste Electrical and Electronic Equipment directive, WEEE)과 밀접한 관계가 있다.

• Ocean and Polar Research
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• 제33권1호
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• pp.69-76
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• 2011

A test miner named MineRo was constructed for the purpose of shallow water test of mining performance. In June of 2009, the performance test was conducted in depth of 100 m, 5 km away from Hupo-port (Korean East Sea), to assess if the developed system is able to collect and lift manganese nodules from seafloor. In August of 2010, in-situ test of automatic path tracking control of MineRo was performed in depth of 120 m at the same site. For path tracking control, a localization algorithm determining MineRo's position on seabed is prerequisite. This study proposes an improved underwater navigation algorithm through estimation of MineRo's kinematic parameters. In general, the kinematic parameters such as track slips and slip angle are indirectly calculated using the position data from USBL (Ultra-Short Base Line) system and heading data from gyro sensors. However, the obtained data values are likely to be different from the real values, primarily due to the random noise of position data. The aim of this study is to enhance the reliability of the algorithm by measuring kinematic parameters, track slips and slip angle.