• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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• v.14 no.3
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• pp.253-266
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• 2016

In accordance with the classification system of radioactive waste in Korea, all the disused sealed radioactive sources (DSRSs) fall under the category of EW, VLLW or LILW, and should be managed in compliance with the restrictions for the disposal method. In this study, the management and disposal method are drawn in consideration of half-life of radionuclides contained in the source and A/D value (i.e. the activity A of the source dividing by the D value for the relevant radionuclide, which is used to provide an initial ranking of relative risk for sources) in addition to the domestic classification scheme and disposal method, based on the characteristic analysis and review results of the management practices in IAEA and foreign countries. For all the DSRSs that are being stored (as of March 2015) in the centralized temporary disposal facility for radioisotope wastes, applicability of the derivation result is confirmed through performing the characteristic analysis and case studies for assessing quantity and volume of DSRSs to be managed by each method. However, the methodology derived from this study is not applicable to the following sources; i) DSRSs without information on the radioactivity, ii) DSRSs that are not possible to calculate the specific activity and/or the source-specific A/D value. Accordingly, it is essential to identify the inherent characteristics for each of DSRSs prior to implementation of this management and disposal method.

• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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• v.9 no.2
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• pp.73-80
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• 2011

The radiation shielding analysis for a Burnup-credit (BUC) cask designed under the management of Korea Radioactive Waste Management Corporation (KRMC) was performed to examine the contribution of each radiation source affecting dose rate distribution around the cask. Various radiation sources, which contain neutron and gamma-ray sources placed in active fuel region and the activation source, and imaginary nuclear fuel were all considered in the MCNP calculation model to realistically simulate the actual situations. It was found that the maximum external and surface dose rates of the spent fuel cask were satisfied with the domestic standards both in normal and accident conditions. In normal condition, the radiation dose rate distribution around the cask was mainly influenced by activation source ($^{60}Co$ radioisotope); in another case, the neutron emitted in active fuel region contributed about 90% to external dose rate at 1m distance from side surface of the cask. Besides, the contribution level of activation source was dramatically increased to the dose rates in top and bottom regions of the cask. From this study, it was recognized that the detailed investigation on the radiation sources should be performed conservatively and accurately in the process of radiation shielding analysis for a BUC cask.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2018.11a
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• pp.16-18
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• 2018

선원은 충분한 수면으로 신체적 정신적 피로를 완전히 회복하지 못한 수면부족 상태에서 재승선하여 장기간 항해와 흔들리는 선박 위에서 반복적인 작업 활동을 수행하므로 누적 피로도와 스트레스가 증가하는 악순환을 초래하며 이로 인한 해양 인적사고가 발생할 수 있다. 따라서 사람의 주관적인 판단에 의한 자기평가방법으로 기입하는 설문지 분석이 아닌 선박에 승선하는 동안에 Wearable device를 착용한 상태에서 과학적이고 객관적인 선원의 수면 시간과 효율성을 분석하였다.

• Journal of Navigation and Port Research
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• v.43 no.6
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• pp.384-394
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• 2019

This study investigated the current status of the management system for foreign seafarers boarding Korean ocean-going vessels and analyzed the problems and suggested measures for improvement through the survey of shipping companies, ship management companies, crew manning companies and related associations. The conclusion is summarized as follow. First, it is necessary to reorganize and apply the collective agreements or the laws applicable to the foreign seafarer separately in regard to the foreign seafarer related laws and collective agreements applied in the same way as the Korean seafarer. Second, it is necessary to change the decision-making to shipowner in deciding on the number of foreign seafarers employed by the Korean ocean-going vessels or if the decision-maker remains the same, the relevant laws must be clearly defined pertinent to the decision-maker. Additionally, the number of foreign seafarers should be applied for each position and ship's type. The third is to expand the recognition arrangement for certificate of ships' officers to Eastern Europe and Asian countries to expand the range of options for hiring foreign seafarers. The fourth is to prevent the waste of administrative manpower by simplifying complicated and unnecessary administrative procedures from hiring and boarding of foreign seafarers. The fifth is to establish a systematic training and education system for foreign seafarers in cooperation with related shipping companies and government authorities, associations and so on. This study will contribute to providing a more efficient and systematic management of foreign seafarers boarding Korean ocean-going vessels.

• Journal of the Korean Society of Radiology
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• v.14 no.7
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• pp.1003-1011
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• 2020

This study aims to compare and evaluate the image differences between single and dual sources in applying a technique to reduce metal artifacts using dual energy CT. Discovery CT 256 (GE, USA) as a single source device and Somatom Definition Flash (Siemens Health Care, Forchheim, Germany) as a dual source device. The self-made phantom (pigs with medical titanium screws inserted) was quantitative and qualitatively evaluated under the same conditions by varying the dose under the same conditions using a dual energy CT. The evaluation method was compared by measuring SNR for metal artifacts (scattering, stripe) generated by metal inserts, divided around bones and around tissues. There was a difference in images in the method of reducing metal artifacts between single-source and dual-source devices. In a single source device, the linearized prosthesis by metal implantation showed a greater decrease than the image obtained from a double source device, and the surrounding tissue was well observed without interference from the artifact. In dual-source devices, scattering and stripe artifacts caused by metal inserts decreased more than on a single source device, and signals from adjacent tissues surrounding the metal implant were well observed without diminishing. If the examination is conducted separately between single source and dual source devices depending on whether the area to which the patient is intended to be viewed during the examination is adjacent to the metal insert or the total tissue surrounding the metal insert, it is believed that diagnostic helpful images can be obtained.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2018.11a
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• pp.19-21
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• 2018

선원의 행동오류는 해양사고를 야기하는 하나의 직접적인 원인이기 때문에 이를 이해하는 것은 해양사고 예방에 근본이 된다. 선원의 행동오류를 이해하기 위해서는 행동오류를 추정하고 예측할 수 있어야 한다. 본 연구에서는 은닉 마르코브 모델(Hidden Markov Model, HMM)을 이용하여 선원들의 행동오류를 추정하고 예측하였다. 아울러 5가지 선박의 종류 각각에 나타나는 선원들의 행동오류를 서로 비교 분석하였다. 모델에 사용한 데이터는 해양안전심판원의 해양사고 보고서에 기록된 내용을 SRKBB(Skill-, Rule- and Knowledge-Based Behavior) 모델을 기반으로 분류하고 관측 수열을 생성하며 라벨링 작업을 통해서 구축하였다. 구축한 데이터를 적용하여 HMM을 보정하고 파라미터를 획득하여 선원들의 행동오류에 관한 모델을 구축하였다. 실험 결과, 선박 종류별로 선원들의 행동오류의 패턴은 서로 다르고, 이를 통해서 선박종류별 해기사들의 행동오류의 추정과 예측이 가능함을 일차적으로 확인할 수 있었다. 추후 본 연구를 지속 전개하여 해양사고 예방을 위한 인적오류의 저감에 기여할 수 있는 방안을 모색할 에정이다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2022.11a
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• pp.120-122
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• 2022

본 연구는 국제항해상선 해기사를 중심으로 과학적 모델을 이용하여 수요와 공급 분석을 시도하였으며 식별된 시사점을 바탕으로 우리나라 해기사 수급 정책의 방향성과 수립을 위한 근거로 활용하고자 한다.

• 대한방사선방어학회:학술대회논문집
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• 2009.04a
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• pp.138-139
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• 2009

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• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2020.11a
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• pp.6-7
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• 2020

선원의 직무상 재해율은 일반 산업 재해율 보다 12.6배(2018년 기준)높게 유지되고 있다. 이는 일반 산업재해와 선원의 재해 예방을 위한 근거법이 산업안전보건법과 선원법으로 이원화 되어 있고, 이에 따라 재해예방을 위한 제도가 달리 이행되고 있음이 하나의 요인으로 작용한다. 이에 선원법에 명시된 선내안전보건 관련 규정과 산업안전보건법 및 해사노동협약에서 요구하는 재해예방을 위한 규정을 비교분석하여 선원의 재해예방 방안으로 선내안전보건 관련 인명사고 통계 구축 방안에 필요한 시사점을 도출하고자 한다.

• Journal of Navigation and Port Research
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• v.36 no.3
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• pp.149-155
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• 2012

This study primarily analyzed the use of shipping companies' welfare program by the characteristics of crew's demography and working condition on board, and next examined the effect of the satisfaction to the program on the organizational commitment and job satisfaction to the companies, in order to survey the shipping companies' welfare reality which has performed an influential role to meet the various welfare needs of personal crew. According to the findings in the recent survey of 459 seamen on board, there are differences among the use of the program by crew's the tolerance to work on board and personal characteristics, for example, age, marriage, position, period on board, and years of service. Moreover, the study verified the fact that the higher satisfaction to the use of those program, the higher organizational commitment and job satisfaction of crew.