• Journal of Navigation and Port Research
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• v.26 no.1
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• pp.55-65
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• 2002

The eighteenth century in Great Britain was the period of transformation, Great Britain externally experienced several wars intermittently mid internally transformed into the industrial country in the course of the 18th century. British shipowners were faced with short of seamen mainly due to several wars and expansion of shipping tonnage British shipowners tried to solve the mooing problem by decreasing the number of seamen from 22-23 sailors per ship of 100 tonnage in 1710's to 5 in 1810 and increasing seamen's wage from shillings per common seaman per month in the 17th century to 25 shillings in the middle of the 18th century and equation omitted during the French Revolutionary and Napoleonic Wars. What caused and resulted by specialized shipowners to cope with changeable market situation with flexibility was decrease of the number of seamen per ship and increase of wage.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2012.06a
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• pp.458-460
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• 2012

1970년대에는 일반적으로 상선에 30-40명의 선원이 탑승했었지만, 최근에는 선박의 자동화와 경제적 문제 때문에 점점 선원수를 줄이고 있는 실정이다. 그러나 최근 통계에 따르면 해양사고의 약 80% 정도가 human error에 의해 발생하고 있으며, 이러한 이유중의 하나는 선원 1명당 부과되는 작업량 과다에 있기도 하다. 즉 선원수의 감소는 업무 또는 작업량의 증가를 가져왔고, 하루에 14-18시간 일하는 것은 특별한 일이 아니게 되었다. 따라서 사고의 증가를 유발하지 않는 범위 내에서 선원수의 감소 범위 산정은 경제적 문제로 인해 크게 대두되고 있다. 현재 안전성과 효율성을 고려한 선원수 산정에 대한 정확한 근거 및 산정자료는 없지만, 최근 IMO, 미해안경비대 (US Coast Guard ; 이하 USCG) 등에서 안전승무정원(safe manning)에 관한 논의 및 연구가 진행되고 있다. 본 논문에서는 선박의 안전승무정원의 평가모델에 대한 최근 국내외 연구현황을 정리하고, 국내 수용을 위한 방안을 제시하고자 한다.

• Nuclear Engineering and Technology
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• v.20 no.2
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• pp.132-136
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• 1988

A strategic question in groundwater contaminant transport modeling is whether we need to treat waste packages or drums as individual, discrete sources or as approximately lumped sources. In this paper we present analyses of array sources in porous media. We analyze a planar array of sources in porous media with groundwater flow. We compare the concentration field predicted by a detailed model of individual point sources to concentration fields predicted by an infinite plane source and a single point source, all of the same equivalent strength. From this study we identified three regions: (1) a region close to the sources where the effects of adjacent sources are significant and individual source models should be used, (2) a region extending from a few meters to hundreds to thousands of meters downstream, where an equivalent source of infinite extent gives accurate results, and (3) a far-field region, where in an equivalent source of finite extent gives accurate results.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2007.12a
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• pp.109-111
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• 2007

외국인선원 고용 확대의 주된 요인으로 주장되고 있는 선원의 부족문제, 그 중에서도 국적외항상선에 대한 우리나라 해기사의 수급현황을 객관적인 자료에 기초하여 분석함으로써 외국인해기사의 고용범위 조정에 대한 합리적인 근거를 제시하였다.

• Journal of Radiation Protection and Research
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• v.29 no.1
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• pp.17-23
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• 2004

In order to save time and money needed in the purchase commonly used gamma-ray standard sources, a new radioactive standard source was manufactured by the neutron activation of some regent in the research reactor HANARO. The source was manufactured with an aqueous solution by mixing and dissolving the irradiated reagents. The manufactured source was compared with a commercial standard source. It was confirmed that it could be used as an efficiency calibration source. Also, in order to compare the variation of efficiency due to the volume difference for various containers used in radioactivity assay, the efficiency variation as a function of sample volume was investigated.

• Journal of the Korean Society of Marine Environment & Safety
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• v.21 no.1
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• pp.57-63
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• 2015

Foreign seafarers have embarked on the fishing vessels as industrial trainees since 1990s and the total number of foreign seafarers on merchant ships and fishing vessels marked 21,327 as of the end of 2013. Especially, in case of deep-sea fishing vessels and coastal/inshore fishing vessels, although the number of fishing vessels decreased, the number of foreign seafarers nearly doubled during recent 5 years. Looking at the marine accidents occurred to fishing vessels, after multinational seafarers are joining on board fishing vessels, difficulties in communication among seafarers has become a major issue. And the safety rules which could be understandable by foreign seafarers are not provided and the education and training for foreign seafarers are not properly conducted either. Consequently, the risk of marine accidents during fishing operation on fishing vessels has increased and emergency response under the captain's control was not effective enough to cope with such emergency situation. Several forced labour issues were also reported resulting from abusive words and assault committed by Korean seafarers. Therefore, This study aims first to review the cases of marine accidents on board fishing vessels which foreign seafarers are working and, the problems concerning employment and education for those foreign seafarers, and then to point out the necessity of conducting training on the safety rules and regular emergency drills for the foreign seafarers in order to prevent marine accidents.

• 해운
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• no.4 s.27
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• pp.19-25
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• 2006

해양사고 발생시 조사광정에서 사고선박 선원들의 인권보호와 관련하여 EU와 미국이 강경쪽으로 방향을 굳힌 반면, IMO와 ILO는 보호쪽에 무게를 두고 있어 양쪽간 충돌이 예상되고 있다. 다음은 우리 협회가 해양한국 5월호에 기고한 내용을 전재한 것이다.(편집자 주)

• Journal of the Institute of Electronics and Information Engineers
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• v.53 no.9
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• pp.118-125
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• 2016

Rotating modulation collimator(RMC) is a remote sensing technique for a radiation source. This paper introduces an RMC system model and its image reconstruction algorithm based on Kowash's research. The reconstructed image can show the direction of a source. However, the distance to the source cannot be recovered. Moreover, the RMC image suffers from $180^{\circ}$ ambiguity. In this paper, we propose a distance estimation method using two RMCs together with a solution to the ambiguity. We also demonstrate its performance using simulated RMC data.

• Proceedings of the Korean Nuclear Society Conference
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• 1998.05b
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• pp.606-611
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• 1998

330MWt 출력의 신형 원자로인 SMART(System integrated Mod씰w Advanced ReacTor)가 전기 생산뿐만 아니라 해수의 담수화를 위한 에너지 공급을 위해 한국원자력연구소에 의해 개발되고 있다. SMART의 원자로 압력용기에서의 중성자 조사량을 기존의 각분할법 코드 대신에 몬데칼로 수송 코드인 MCNP-4A를 이용하여 평가하였다. MCNP-4A에 의한 몬데 칼로 모사는 각분할법에 비해 핵 단면적 자료, 선원항, 그리고 기하학적 모델링의 문제로부터 야기되는 불확실성을 감소시킬 수 있을 뿐만 아니라 초기 개념 설계 단계에서 상세 노심 출력 분포 자료에 의존하지 않고 선원항을 평가할 수 있는 장점이 있다. 본 연구에서는 원자로 압력 용기 내부의 원자로 노심 및 다른 구조물을 포함하는 전체 원자로 구조에 대하여 몬테 칼로 모사를 적용하였다. 1단계에서는 임계도 계산에 의해 선원항으로 이용되는 원자로 노심내의 열 출력 분포를 평가하고, 2단계에서는 노심내의 열 출력 분포를 고정 선원으로 이용하여 압력 용기에서의 중성자 조사량을평가하였다. 그 결과 SMART 압력용기의 중성자 조사량은 규제 요건을 만족하는 것으로 나타났다.

• Proceedings of the Korean Society of Medical Physics Conference
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• 2005.04a
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• pp.42-46
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• 2005

The Dose calculation program for the Buchler remote after-loading system was developed. We use iridium source for the tandem and cessium for the ovoids. We determined the source length and distributions by dividing the program disk to 72 points. The dose rate for the each program disk were calculated and stored to the tables for the xy coordinates. The dose rate for the interesting points for the patients were calculated by using these tables. We also made isodose curve from the calculations. By using the program, we could calculate the dose rate for the various points of the patient quickly and accurately.