도시가스 배관의 파손시 폭발, 화재 사고로 이어지는 경우 기업뿐 아니라 사회적으로 큰 리스크를 발생시킨다. 그러나 매설배관과 병행 또는 교차 되는 구간의 전기설비에 대한 전격 위험성 평가에 대한 연구는 전무하다. 이에 본 연구에서는 전격 위험성 평가의 필요성과 실시방법 및 효과를 소개하여 도시가스 공사 시 전기설비로 인한 사고 위험을 예방하고 근로자와 시민들의 안전을 강화 하는데 기여 하고자 한다. 전격 위험성 평가는 정보 수집을 위한 위험지역 선정, 정밀 검사 및 위험성 평가, 전격 해소 방법론으로 구성되어 있다. 전격 위험성 평가의 효과성을 확인하기 위해 Test bed를 실시하였다. 국내 도시가스 공급사인 ‘P’사 ‘A1’ 공급권역에 전격 위험성 평가 실증 실시 후, ‘B2’, ‘C3’ 공급권역으로 확대 하여 적용하였으며, 평가 실증 또한 실행 하였다. 전격 위험성 평가의 항목은 국·외 기준을 바탕으로 평가 세부 기준을 구축 후 평가 지표를 개발하였으며, 평가 범위에 따른 평가 등급을 도출하고 도출된 등급에 따라서 위험도를 낮추는 해결 방법을 제안 하였다. 전격 위험성 평가를 통해서 매설배관에 유입되는 전압 위험에 따른 감전의 위험으로부터 작업자를 보호하고, 안전을 확보할 수 있다. 따라서 연구에서는 도시가스 매설배관 작업시 발생할 수 있는 감전, 폭발 등의 위험을 방지하기 위해 전격 위험성 평가를 작업 표준으로 도입하고 전국의 도시가스사 및 LPG 배관망 시공사를 대상으로 확산할 것을 제안하였다.

The demand for transportation is increasing due to the continuous generation of radioactive wastes. Especially, considering the geographical characteristics of Korea and the location characteristics of nuclear facilities, the demand for maritime transportation is expected to increase. If a sinking accident happens during maritime transportation, radioactive materials can be released into the ocean from radioactive waste transportation containers. Radioactive materials can spread through the ocean currents and have radiological effects on humans. The effect on humans is proportional to the concentration of radioactive materials in the ocean compartment. In order to calculate the concentration of radioactive materials that constantly flow along the ocean current, it is necessary to divide the wide ocean into appropriate compartments and express the transfer processes of radioactive materials between the compartments. Accordingly, this study analyzed various ocean transfer evaluation methodologies of overseas maritime transportation risk codes. MARINRAD, POSEIDON, and LAMER codes were selected to analyze the maritime transfer evaluation methodology. MARINRAD divided the ocean into two types of compartments that water and sediment compartments. And it was assumed that radionuclides are transfered from water to water or from water to sediment. Advection, diffusion, and sedimentation were established as transfer process for radionuclides between compartments. MARINRAD use transfer parameters to evaluate transer processes by advection, diffusion, and sedimentation. Transfer parameters were affected by flow rate, sedimentation rate, sediment porosity, and etc. POSEIDON also divided the ocean into two types that water and sediment compartment, each compartments was detaily divided into three vertical sub-compartment. Advection, diffusion, resuspension, sedimentation, and bioturbation were established as transport processes for radionuclides between compartments. POSEIDON also used transfer parameters for evaluating advection, diffusion, resuspension, sedimentation, and bioturbation. Transfer parameters were affected by suspended sediment rates, sedimentation rates, vertical diffusion coefficients, bioturbation factors, porosity, and etc. LAMER only considered the water compartment. It divided the water compartment into vertical detailed compartments. Diffusion, advection and sedimentation were established as the nuclide transfer processes between the compartments. To evaluated the transfer processes of nuclides for diffusion and advection, LAMER calculated the probability with generating random position vectors for radionuclides’ locations rather than deterministic methods such as MARINRAD’s transfer parameters or POSEIDON’s transfer rates to evaluate transfer processes. The results of this study can be used as a basis for developing radioactive materials’ ocean transfer evaluation model.

As the demand for nuclear power increases as a means to achieve carbon neutrality, concerns about nuclear proliferation have also grown. Consequently, significant researches have conducted to enhance nuclear non-proliferation resistance. Among these research, nuclear material attractiveness is a methodology used to evaluate how appealing a particular material is for potential use in nuclear weapons, based on the characteristics of that material. Existing nuclear material attractiveness assessments focused on materials like U, Pu, and TRU, which could be directly used in the production of nuclear weapons. However, these assessments did not consider how the properties of nuclear materials change throughout the nuclear fuel cycle, with each facility process. This study assumed a scenario of the nuclear fuel cycle of graphite reduction reactors and analyzed including enrichment facilities and PUREX. This study used the FOM (Figure-Of-Merit) method developed by LANL (Los Alamos National Laboratory) for evaluating the nuclear material attractiveness. The FOM formula consists of three parameters such as critical mass, heat content, and dose The critical mass of targe materials and the dose evaluation were conducted using the Monte Carlo N-Particle code. The heat content was calculated using the ORIGEN code embedded in the Scale code. In particular, if U-238 is dominant in the facility’s materials, such as mining and refining facilities, and critical mass evaluation is unpractical. Therefore, 1SQ (Significant Quantity) of that uranium was assumed as the critical mass value for the FOM evaluation, even though 1SQ is not identical to the critical mass As a result of this study, the attractiveness of Pu produced by PUREX among all nuclear fuel cycle facilities was 2.7616, which was the most attractive to be diverted to nuclear weapons. Through this study, it was shown that the proliferation risk of the nuclear facilities in the nuclear fuel cycle and risk of diversion among those facilities.

본 논문은 선박이 조우하는 상황에서 충돌의 위험에 대한 판단을 지원하여 충돌사고를 예방하기 위하여 선박충돌위험성을 평 가하는 방법을 제안하고자 한다. 선박의 항해는 불확실성이 다수 내포되어 있기 때문에 충돌의 위험을 평가할 때 선박충돌위험성이 가진 불확실성을 고려할 필요가 있다. 본 논문은 불확실성을 처리하고 각 상대 선박의 충돌의 위험을 실시간으로 평가하기 위하여 Dempster－ Shafer 이론을 적용한다. 선박충돌위험의 평가 요인으로 DCPA(distance at closest point approach), TCPA(time to closest point approach), 상대 선 박과의 거리, 상대방위, 속도비율 등이 사용되며, 각 평가 요인별 멤버쉽 함수로 계산된 기본확률배정함수(basic probability assignment)는 Dempster－Shafer 이론의 융합 규칙을 통하여 융합된다. 선박들이 실제로 조우하는 상황에서 수집된 선박자동식별장치 데이터를 사용하여 제안된 방법을 실험한 결과 평가의 적합성이 검증되었다. 선박간 조우 상황에서의 실시간으로 충돌위험성을 평가함으로써 인적오류로 인 한 충돌사고를 예방할 수 있으며, 해상교통관제시스템과 자율운항선박의 충돌회피시스템에도 활용될 것으로 기대된다.

In recent years, juvenile offenders have made up an increasing number of all criminal suspects, and minor crimes are becoming a more serious social problem in most countries and regions around the world. While community correction occupies a very important position in the minor crime punishment system, current community correction risk assessments mainly depend on qualitative analysis or simple mathematical statistics using collected data. In combination with relevant theories and regulations, this paper offers a systematic look at the development and theories of community correction and the related risk assessment system and analyzes the characteristics of community correction risk assessment methods of juvenile offenders in different countries. Moreover, it discusses some new risk assessment technologies based on artificial intelligence theory for community correction risk evaluation of juvenile offenders. The effectiveness of the proposed community correction risk assessment method is verified using some real-world community correction assessments.

Tuna fisheries were applied to an integrated ecosystem-based fishery risk assessment method using indexes of target species status, inhabited species in a target ecosystem, habitat quality and socio-economic benefit of affected fisheries. This study suggested more effective and efficient management measures to break away from traditional management methods, such as limitation of catch and fishing effort. The results presented that the objective risk index (ORIS) on sustainability of bigeye and yellowfin tunas by purse seine fishery was estimated high due to the high catch ratio of small fishes. The ORIs of biodiversity (ORIB) and habitat quality (ORIH) of purse seine fishery were also estimated at a high level from using fish-aggregating devices (FAD). However, due to skipjack tuna’s high catches, the ORI of socio-economic benefit (ORIE) was estimated at a very low level. Due to the high bycatch rate, ORIB was high, and ORIS and ORIH were evaluated at a low level in longline fishery. Due to strengthern of fishing restrictions and increase of fishing costs, the ORIE was assessed to be very high. The ecosystem risk index (ERI) for two tuna fisheries was assessed low, but the overall FAD management by purse seine fishery is necessary at the ecosystem level.

본 연구에서는 복부대동맥류가 발생한 환자들에서의 연령과 복부대동맥류 형상에 따른 벽 응력과 파열 위험성을 평가하였다. 복부 대동맥류의 형상은 의료영상 데이터로부터 추출되어 모사되었으며, 재료 물성치 단계에서는 동맥 조직의 이방성 초탄성 성질을 모사 하기 위해 Gasser-Ogden-Holzapfel 모델을 적용하였다. 또한, 모델에서 필요한 각 재료 정수들은 환자들의 연령과 정상 조직 및 동맥 류 조직의 특성들을 고려하기 위하여 각기 다른 값들로 산정되었다. 게다가 복부대동맥류에서의 대동맥 직경과 목의 각도에 관한 상 관관계를 분석하고, 이에 대한 시리즈 시뮬레이션 역시 수행되었다. 그 결과, 복부대동맥류 환자의 연령과 대동맥 직경, 그리고 대동 맥 목의 각도에 따른 복부대동맥류의 파열 위험성이 평가되었다.

Stow net fishery is one of the fishery with high fishing work accidents in southwestern sea of Korea. We conducted to serve as basic data for improving the healthy and safe working environment of fisher using risk assessment process (ISO45001) with fishermen’s occupational accidents of the National Federation of Fisheries Cooperative (NFFC) from 2016 to 2018. The average occurrence rate of victim in this fishery was 9.04%, 16.7 times more than such rate in all industries. In addition, the average fatality rate was found to have a very serious level management to 31.06‱, 27.7 times more than such rate in all industries. The safety hazards of stow net fishery was more likely to occur by other general industrial groups, with more severe consequences after the accident. According to 4M analysis, 58.6% of all accidents were caused by human factors, 24.0% by environmental factors, 16.0% by mechanical factors, and 1.5% by managerial factors, respectively. The occurrence frequency by accident type was the highest in 187 cases (32.2%) for struck by object, 158 cases (27.2%) for slipping, and 94 cases (16.2%) for being in contact with machinery. Severity is the highest for others such as diseases etc., in the order of being struck by object, being in contact with machinery, falling from above slipping, collapsing, bumping, and burning. Being struck by object, being in contact with machinery, and slipping are high-risk groups, falling from above others, bumping, and burning are medium-risk groups based on the risk assessment using the occurrence frequency and severity of accident. The obtained results are expected to contribute to the safe operation environment subsidy for fishing crews on the stow net fishing vessel.

This study would present a risk analysis method to evaluate stable tap water supply in a multi-regional water supply system and propose a measure for the evaluation of the effect of the conjunctive operation of the multi-regional water supply system using this. Judging from the vulnerability for the crisis response of the entire N. multi-regional water supply system, as compared to the result of Scenario 1 in which no conjunctive pipes were operated, it was found that in Scenario 2, in which conjunctive pipes were partially operated, the vulnerability of crisis response decreased by about 30.6%, and as compared to Scenario 3, the vulnerability of crisis response decreased by 86.2%. In setting a plan for stable tap water supply in N multi-regional water supply system, using the estimated value and the method for the evaluation of the vulnerability of crisis response by pipe, by interval and by line, it is judged that this can be utilized as a basis for the judgment of the evaluation of the operation or the additional installation of conjunctive pipes.

PURPOSES: The objective of this study is to evaluate road subsidence based on model chamber tests. METHODS : A theoretical review of road subsidence mechanisms was carried out, and a series of soil chamber tests with initial cavities were conducted under various conditions. Road subsidence risk was analyzed based on these results. RESULTS: The cavity collapse risk was affected by multiple factors, including cavity location, traffic loading, and asphalt layer thickness. The Nf number of loading required to reach cavity collapse increased as the cavity width increased, cavity depth decreased, and asphalt layer thickness increased. CONCLUSIONS: The effects of asphalt thickness on the risk of road subsidence was assessed to have an additional 1.5-fold effect on the subgrade thickness. This study proposed an effective cavity depth (Deff), considering the strength of the asphalt layer. Based on the results of the model chamber test, a four-class road subsidence risk model was proposed with effective cavity depths and widths. It was found that the risk of road subsidence increased as the cavity width increased and the effective cavity depth decreased. This trend is also well matched to the road subsidence risk models of Japan and Seoul.

Less mature nuclear reactor technologies are characterized by a greater uncertainty due to insufficient detailed design information, operational data, cost information, etc., but the expected performance characteristics of less mature options are usually more attractive in comparison with more mature ones. The greater uncertainty is, the higher economic risks associated with the project realization will be. Within a comparative evaluation of less and more mature nuclear reactor technologies, it is necessary to apply economic risk measures to balance judgments regarding the economic performance of less and more mature options. Assessments of any risk metrics involve calculating different characteristics of probability distributions of associated economic performance indicators and applying the Monte-Carlo method. This paper considers the applicability of statistical risk measures for different economic performance indicators within a trial case study on a comparative evaluation of less and more mature unspecified LWRs. The presented case study demonstrates the main trends associated with the incorporation of economic risk metrics into a comparative evaluation of less and more mature nuclear reactor technologies.

목적 : 전면진입착석 화장실을 구현하고 실제 사용자에게 적용한 후 평가해봄으로써 휠체어 사용자들에게 신체적인 부담이 적으며 사용상 만족도가 높은 화장실로서의 적용 가능성을 타진해 보는 것이 본 연구의 목적이다. 연구방법 : 휠체어 사용자 40명에게 일반적 특성과 현재 사용하고 있는 휠체어에 관한 정보에 대한 설문조사를 실시한 후 기존에 사용하고 있는 화장실과 전면진입착석 화장실에서 화장실 용무를 시연하는 과제를 수행하도록 하였다. Rapid Entire Body Assessment(REBA)를 적용한 근골격계질환 위험성 평가, Quebec Evaluation of Satisfaction with assistive Technology 2.0(QUEST 2.0)을 활용한 사용자 만족도 조사, 사용 후 주관적 의견을 평가하였다. 결과 : REBA 평가 결과 기존의 화장실을 이용했을 때 점수(6.53±1.15)와 전면진입착석 화장실을 이용한 후 점수(3.18±.38)는 통계학적으로 유의한 차이(z=-5.930, p<.001)를 보였다. 사용자 만족도 조사 결과 내구성(4.48±.62)이 가장 좋은 점수로 평가되었고 안전성(4.38±.63), 필요성(4.33±.73), 범용성(4.3±.61) 순서로 점수가 높았고 크기 적절성(3.93±.67)이 가장 낮은 점수를 받았다. 사용 후 주관적 의견 조사에서 ‘몸을 회전하지 않아도 되니 편하다(30.8%)’가 가장 많았다. 결론 : 본 연구결과 전면진입착석 화장실이 근골격계질환의 위험성을 낮출 수 있다는 가능성과 사용자들의 만족도가 높다는 것을 확인하였다. 본 연구를 통해 작업치료사가 환경수정 중재 방법을 고려할 경우 응용할 수 있는 참고자료로 활용하길 바라며 추후 연구에서 개인적 화장실 뿐만아니라 공공화장실에서도 활용할 수 있는 작업치료학의 발전에 기초자료로 활용되길 기대한다.

Floor slipperiness is a leading cause in slip and fall accidents which are a major source of occupational injuries in Korea. Researchers have estimated the slip and fall related accidents rank number one or two in number of the injured. The objectives of this study were to find the field contamination effect and improvement countermeasure. Slipping and falling are common accidents in large public facilities, especially facility which vulnerable adults generally use as like hospital. So, we measured the coefficient of friction of several floors on the floor in hospital, under dry and wet using BOT-3000. The results of the coefficient of friction measurements showed that floor type and surface conditions were all significant factors affecting the coefficient of friction. The most surprising finding of this study was that there were significant friction improvement when the floors were properly cleaned with cleaning equipments

전 세계적인 그리고 국가적인 규모에서 멸종위기야생식물의 멸종위험 평가와 더불어 지역적인 규모에서의 멸종위험 평가는 직접적인 보전활동의 계획과 실행에 있어 대단히 중요하다. 우리나라 중동부지역에는 34종의 멸종위기야생식물 이 분포하였다. 각각의 종에 대해 분포지, 분포면적, 개체수 및 개체군의 소멸에 영향을 미칠 수 있는 요인을 조사하였다. 조사결과에 따라 각각의 종이 소유하고 있는 생활사 특성을 포함한 10가지 평가항목을 바탕으로 위험요인을 평가하였 다. 34종에 대한 위험요인 평가결과 첫째, 다수의 위험요인이 존재하고 심각한 훼손압력에 노출되어 있어 적극적이고 시급한 생육지 보전활동이 필요한 12종, 둘째, 소수의 직접적인 위험요인을 제거하는 것으로 개체군의 지속이 가능한 16종, 셋째, 비교적 넓은 분포지와 많은 개체수에 따라 소극적인 관리를 통해서도 개체군의 지속이 가능한 6종으로 구분되었다. 멸종위기야생식물에 있어 가장 큰 위험요인은 인구의 증가, 개발, 채취에 따른 생육지와 개체군의 소멸이었 다. 또한 식생환경의 변화로 인한 적합한 생육지의 감소와 재정착의 기작이 정상적으로 작동하지 않는 생태계 건강성의 상실이 또 다른 원인이 될 수 있다. 본 조사가 이루어진 지역에서 멸종위기야생식물의 분포지와 출현 빈도 및 중요도를 바탕으로 5개 권역별을 제시하였다. 그리고 각 권역의 특성에 따른 보전 전략을 제시하였다. 우리는 멸종위기야생식물 의 멸종위험에 대한 평가는 분포현황정보 뿐만 아니라 종의 생활사 특성을 포함하는 평가방법이 필요함을 제안한다. 뿐만 아니라 개체군동태와 생태적 지위에 대한 이해가 필요함을 제안한다.