• 한국토양비료학회지
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• 제44권1호
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• pp.38-47
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• 2011

This study focused on health risk assessment via multi-routes of As exposure to establish a target cleanup level (TCL) in abandoned mines. Soil, ground water, and rice samples were collected near ten abandoned mines in November 2009. The As contaminations measured in all samples were used for determining the probabilistic health risk by Monte-Carlo simulation techniques. The human exposure to As compound was attributed to ground water ingestion. Cancer risk probability (R) via ground water and rice intake exceeded the acceptable risk range of $10^{-6}{\sim}10^{-4}$ in all selected mines. In particular, the MB mine showed the higher R value than other mines. The non-carcinogenic effects, estimated by comparing the average As exposure with corresponding reference dose were determined by hazard quotient (HQ) values, which were less than 1.0 via ground water and rice intake in SD, NS, and MB mines. This implied that the non-carcinogenic toxic effects, due to this exposure pathway had a greater possibility to occur than those in other mines. Besides, hazard index (HI) values, representing overall toxic effects by summed the HQ values were also greater than 1.0 in SD, NS, JA, and IA mines. This revealed that non-carcinogenic toxic effects were generally occurred. The As contaminants in all selected mines exceeded the TCL values for target cancer risk ($10^{-6}$) through ground water ingestion and rice intake. However, the As level in soil was greater than TCL value for target cancer risk via inadvertent soil ingestion pathway, except for KK mine. In TCL values for target hazard quotient (THQ), the As contaminants in soil did not exceed such TCL value. On the contrary, the As levels in ground water and polished rice in SD, NS, IA, and MB mines were also beyond the TCL values via ground water and rice intake. This study concluded that the health risks through ground water and rice intake were greater than those though soil inadvertent ingestion and dermal contact. In addition, it suggests that the abandoned mines to exceed the risk-based TCL values are carefully necessary to monitor for soil remediation.

• 한국가스학회지
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• 제22권6호
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• pp.52-58
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• 2018

신뢰도 기반 접근법(RBDA)에서, 신뢰도 목표는 설계 및 유지관리 단계에서 관계되는 한계상태를 충족할 수 있는 정도의 안전 수준을 가지는 지 확인하기 위해서 사용된다. 우리나라의 경우 가연성 가스 배관에 대한 신뢰도 목표는 아직 개발되거나 활용되지 못하고 있다. 다만 신뢰도 목표 대신에 사회적 위험과 개인적 위험과 같은 위험 측정지표에 대한 허용가능(tolerable) 판단기준이 배관의 위험관리에 적용되어 왔다. 본 논문에서는 고압천연가스 배관에 대한 정량적 위험평가 시 판단기준으로 삼는 사회적, 개인적 위험 판단기준을 사용하여 신뢰도 기반 접근법의 핵심요소인 목표 신뢰도를 개발하는 절차를 소개하고 자 한다. 또한 소개된 절차를 통해 천연가스와 수소가스 수송배관에 대한 신뢰도 목표를 제안한다.

• Safety and Health at Work
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• 제12권2호
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• pp.238-243
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• 2021

Objectives: The aim of this study was to provide baseline data for the assessment of exposure to indium and to prevent adverse health effects among workers engaged in the electronics and related industries in Republic of Korea. Methods: Total (n = 369) and respirable (n = 384) indium concentrations were monitored using personal air sampling in workers at the following 19 workplaces: six sputtering target manufacturing companies, four manufacturing companies of panel displays, two companies engaged in cleaning of sputtering components, two companies dedicated to the cleaning of sputtering target, and five indium recycling companies. Results: The level of exposure to total indium ranged from 0.9 to 609.3 ㎍/m³ for the sputtering target companies; from 0.2 to 2,782.0 ㎍/m³ for the panel display companies and from 0.5 to 2,089.9 ㎍/m³ for the indium recycling companies. The level of exposure to respirable indium was in the range of 0.02 to 448.6 ㎍/m³ for the sputtering target companies; 0.01 to 419.5 ㎍/m³ for the panel display companies; and 0.5 to 436.3 ㎍/m³ for the indium recycling companies. The indium recycling companies had the most samples exceeding the exposure standard for indium, followed by sputtering target companies and panel display companies. Conclusions: The main finding from this exposure assessment is that many workers who handle indium compounds in the electronics industry are exposed to indium levels that exceed the exposure standards for indium. Hence, it is necessary to continuously monitor the indium exposure of this workforce and take measures to reduce its exposure levels.

• 한국산업보건학회지
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• 제25권3호
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• pp.254-284
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• 2015

Objectives: There is a requirement to select target materials for mutagenicity(Genotoxicity) testing, so we determined to set the test priorities of them by searching the related database. Methods and Results: We searched a number of databases to find information on mutagenicity tests with chemicals under the Occupational Safety and Health Act(OSH Act), such as KOSHANET, National Toxicology Program(NTP), European Chemicals Agency(ECHA), US National Library of Medicine(NLM), and Genetic Toxicology Data Bank(GENE-TOX), as well as ChemIDplus webpage, and presented the information. Also we anticipated their hazards with ACToR sites to confirm the 58 mutagenicity(Genotoxicity) tests we will perform. Conclusions: We presented target materials for mutagenicity testing with specific GLP tests consisting of reverse mutation(Ames), chromosomal aberration and micronucleus test.

• 해양환경안전학회:학술대회논문집
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• 해양환경안전학회 2009년도 춘계학술발표회
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• pp.71-75
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• 2009

본 연구는 AHP를 이용한 항만국 통제 표적점검 평가법을 제안한다. 기존 항만국통제 TFV(Target Factor Values)는 단순한 평가법이기 때문에 보다 합리적이고 객관적인 평가법인 AHP법을 이용하였다. 그러나 AHP법은 상대평가법이기 때문에 대체안 추가시 가중치 재산정해야 한다. 따라서 이러한 해결을 위해 절대평가법을 이용하였다. 또한 최근 IMO에서 해양사고율을 항만국 통제 TFV에 포함하려고 추진중이기 때문에 해양사고 항목을 평가에 포함하였다. 마지막으로 몇척의 선박을 대상사례로 평가를 수행하였다.

• 한국안전학회지
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• 제27권5호
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• pp.64-69
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• 2012

The concept of SIL is applied in the most of all standards relating to functional system safety. However there are problems for the people to apply SIL to their plants. as these standards don't include sufficient informations. In this regards, this paper will suggest the direction of SIL application and concept based on IEC 61508 and IEC 61511. A Safety Integrity Level(SIL) is the discrete level(one out of possible fours), corresponding to a range of the probability of an E/E/PE (Electric/Electrical/Programmable Electrical) safety-related system satisfactorily performing the specific safety functions under all the stated conditions within a stated period of time. SIL can be divided into the target SIL(or required SIL) and the result SIL. The target SIL is determined by the risk analysis at the analysis phase of safety lifecycle and the result SIL is calculated during SIL verification at the realization phase of safety lifecycle. The target SIL is determined by the risk analysis like LOPA(Layer Of Protection Analysis), Risk Graph, Risk Matrix and the result SIL is calculated by HFT(Hardware Fault Tolerance), SFF(Safe Failure Fraction) and PFDavg(average Probability of dangerous Failure on Demand). SIL is applied to various areas such as process safety, machinery(road vehicles, railway application, rotating equipment, etc), nuclear sector which functional safety is applied. The functional safety is the part of the overall safety relating to the EUC and the EUC control system that depends on the correct functioning of the E/E/PE safety-related systems and other risk reduction measures. SIL is applied only to the functional safety of SIS(Safety Instrumented System) in safety. EUC is the abbreviation of Equipment Under Control and is the equipment, machinery, apparatus or plant used for manufacturing, process, transportation, medical or other activities.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제17권4호
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• pp.1066-1079
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• 2023

Multi-target tracking based on the detector is a very hot and important research topic in target tracking. It mainly includes two closely related processes, namely target detection and target tracking. Where target detection is responsible for detecting the exact position of the target, while target tracking monitors the temporal and spatial changes of the target. With the improvement of the detector, the tracking performance has reached a new level. The problem that always exists in the research of target tracking is the problem that occurs again after the target is occluded during tracking. Based on this question, this paper proposes a DeepSORT model based on SIFT features to improve ship tracking. Unlike previous feature extraction networks, SIFT algorithm does not require the characteristics of pre-training learning objectives and can be used in ship tracking quickly. At the same time, we improve and test the matching method of our model to find a balance between tracking accuracy and tracking speed. Experiments show that the model can get more ideal results.

• 한국안전학회지
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• 제24권3호
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• pp.65-70
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• 2009

In-vehicle route guidance information(RGI) systems have been developed with the advancement of the information and communication technologies. However, the RGI is provided by a pre-determined option, drivers occasionally pass the target intersection owing to non- or late- recognizing it. The purpose of this experiment is to examine the position of driver's tum signal operation and intersection recognition approaching at the target intersection which is difficult to identify as a preliminary research on developing the additional RGI connecting with the tum signal control. The field experiment was conducted to measure distances of the turn signal operation and intersection recognition from the target intersection according to driving lanes and landmarks at adjacent intersection. And, glance behavior to the car navigation display was evaluated by using an eye camera. The results indicate that drivers operate the turn signal after confirming a landmark in the case of the intersection with it. However, most case of driving, drivers operate the tum signal at 40 to 50m before coming to the target. To provide the additional RGI, when drivers do not operate the tum signal approaching at the target intersection based on the results, is expected to improve the traffic safety and the comfort for drivers.

• 한국철도학회논문집
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• 제12권4호
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• pp.443-449
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• 2009

국가에서는 철도운영 및 시설기관에 산재되어 있는 철도안전정보를 수집하여 분석할 수 있는 철도안전정보 종합관리시스템을 구축하야 철도안전관리를 효율적으로 수행하기 위하여 노력하고 있다. 매년 철도안전도를 평가하기 위하여 철도사고 자료를 분석하여 사망자 및 부상자 수를 산출하고 있으며 사고 원인 및 위험발생 경위를 규명하여 사고를 최소화 할 수 있도록 여러 안잔정책 및 안전관리방안을 시행하고 있다. 따라서 보다 선진적인 안전정책 수립 및 안전관리를 위해 철도안전도를 입체적으로 그리고 정량적으로 표현할 수 있는 방안이 필요하며 이를 위해서는 안전에 대한 주요 영향요소가 무엇인지를 파악해야 하며 선정된 개발적 요소들에 대한 정량적 철도안전지수(Railway Safety Index)를 개발해야 한다. 본 연구에서는 철도안전도를 정량적으로 평가할 수 있는 안전도 평가지표를 개발하여 안전목표 수립 및 관리 등 철도안전향상를 위한 전략적 방향 및 정책수립 과정에서 활용할 수 있는 모델을 제공하고자 한다.

• Nuclear Engineering and Technology
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• 제56권1호
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• pp.147-159
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• 2024

Plutonium-238 has always been considered as the one of the promising radioisotopes for space nuclear power supply, which has long half-life, low radiation protection level, high power density, and stable fuel form at high temperatures. The industrial-scale production of ²³⁸Pu mainly depends on irradiating solid ²³⁷NpO₂ target in high flux reactors, however the production process faces problems such as large fission loss and high requirements for product quality control. In this paper, a conceptual design study of producing ²³⁸Pu in a multi-purpose high flux reactor was evaluated and analyzed, which includes a sensitivity analysis on ²³⁸Pu production and a further study on the irradiation scheme. It demonstrated that the target structure and its location in the reactor, as well as the operation scheme has an impact on ²³⁸Pu amount and product quality. Furthermore, the production efficiency could be improved by optimizing target material concentration, target locations in the core and reflector. This work provides technical support for irradiation production of ²³⁸Pu in high flux reactors.