• Architectural research
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• 제21권2호
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• pp.49-57
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• 2019

Risk assessment during pre-construction phase is important due to the uncertainty of the risks that may exist in projects. Risk checklist is a method to systematically classify and organize the risks that have been experienced in the past, and to identify the risk factors that may be present in the future projects. In addition, risk value assessment based on checklists plays a key role in risk management, and various risk assessment researches have been conducted to carry out this systematically. However, previous approaches have limitations in common, this is because risk values are evaluated individually in risk checklists, which ignore interdependencies among risk factors and neglect the emergence of co-occurrence of risks. Hence, when multiple risk factors cooccur, they cannot be far off from the conventional method of summing the total risk value to establish the risk response strategy. Most of risk factors are interdependent and may have multiple effects if occurred than expected. In particular, specific cause can be overlapped if multiple risks co-occur, and this may result in overestimation of the risk response for the future project. Thus, the objective of this research is to propose a model to help decision makers to quantify the risk value reflecting the interdependency during the identification phase using existing risk checklist that is currently being practiced in actual construction projects. The proposed model will provide the guideline to support the prediction and identification of the interdependency of risks in practice. In addition, the better understanding and prediction of the exceeding risk response by co-occurring risks during the risk identification phase for decision makers.

• 한국안전학회지
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• 제36권3호
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• pp.50-59
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• 2021

The main purpose of accident analysis is to identify the causal factors and the mechanisms of those factors leading to the accident. However, current accident analysis techniques focus only on finding the factors related to the accident without providing more insightful results, such as structures or mechanisms. For this reason, preventive actions for safety management are concentrated on the elimination of causal factors rather than blocking the connection or chain of accident processes. This greatly reduces the effectiveness of safety management in practice. In the present study, a technique to model the correlational structure of accident risk factors is proposed by using the co-occurrence keyword network analysis technique. To investigate the effectiveness of the proposed technique, a case study involving a portable ladder fall accident is conducted. The results indicate that the proposed technique can construct the correlational structure model of the risk factors of a portable ladder fall accident. This proves the effectiveness of the proposed technique in modeling the correlational structure of accident risk factors.

• 한국가스학회지
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• 제13권1호
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• pp.45-51
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• 2009

본 논문은 국내에 건설된 충전소를 분석 검토하여 수소충전소에 대한 안전성 평가를 실시함으로써 수소충전 소의 안전성에 대한 확인과 충전소 설치 시 필요한 기준마련에 기초자료를 제공하는 것이 궁극적인 목표이다. 안전성 평가 방법으로 FMEA (Failure Mode and Effect Analysis)를 사용하였고, 충전소를 크게 4개의 공정(제조, 압축, 저장, 충전)으로 분류하였다. 또한 각각의 발견된 위험요소에 S (severity), O (occurrence), D (detection)의 점수를 부여하여 이 세 요소의 곱의 값인 RPN (Risk Priority Number)의 수치를 이용하여 위험의 우선순위를 정하고, 이를 바탕으로 시나리오를 생성하였다. 생성한 시나리오를 기반으로 사고피해영향평가 결과 주요한 사고 유형으로 jet fire와 폭발이 나타났고, PSA (pressure swing adsorption) 공정 feed line에서의 누출의 경우 원료물질에 따라 CO가스의 농도가 상이할 수도 있으나, CO가스중독 위험성을 함께 예측되었다.

• 한국사회복지학
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• 제68권2호
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• pp.5-25
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• 2016

알코올, 약물과 같은 물질중독(substance abuse)과 도박 등의 행위중독(behavioral addiction)은 공통의 속성을 가지며, 동일한 기전에 의해 발생하며, 실제로 동시발생(co-occurrence)률이 높은 것으로 보고된다. 최근 대학생 집단에서도 음주 및 도박행동이 동시에 나타나며 이로 인해 다중 중독의 문제 및 부정적 결과가 초래되고 있다. 이 연구는 선행연구에서 문제도박 발생의 예측요인으로 제시되는 음주행동에 주목하고, 이에 기반하여 연구모형을 구성하여, 전국에서 표집 한 455명의 대학생을 대상으로 그 관계를 실증적으로 검증해 보는 것을 목적으로 하였다. 로지스틱 회귀분석 결과, 문제도박에 영향을 미칠 수 있는 인구사회학적 및 가족 변인을 통제한 모델에서 음주문제는 도박문제 발생을 예측하는 유의미한 변인으로 나타났다. 결론에서는 주요 연구결과를 중심으로 사회복지 실천현장, 정책수립 과정, 향후 중독분야 연구에서 활용할 수 있는 이 논문의 함의를 논의하였다.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제50권3호
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• pp.134-139
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• 2024

We systematically reviewed the literature on the co-occurrence of squamous cell carcinoma (SCC) and Warthin's tumor (WT), thought to be quite rare, to help reduce misdiagnosis and improve treatment planning. For this systematic review, we searched for articles in the Web of Science and PubMed databases, analyzed relevant studies for forward and backward citations, and identified only articles reporting on the "co-occurrence" of WT and SCC. Of the 237 studies identified, 12 comprising 18 patients met the inclusion criteria, to which we added one study from our institution. Most WTs were associated with SCC in the parotid gland or cervical lymph nodes. Most patients (89.5%) underwent selective or radical neck dissection due to identification of lesions separate from the primary SCC. Despite its frequent co-occurrence with other neoplasms, WT in the parotid or cervical lymph nodes tends to be misdiagnosed as a metastatic node when SCC is observed as the primary tumor. Factors to consider in diagnosis and neck management include identification of an association other than growth or development by lymphangiogenesis and whether the patient is a smoker, a strong risk factor.

• Child Health Nursing Research
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• 제27권3호
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• pp.201-210
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• 2021

Purpose: This study analyzed research trends related to childhood and adolescent cancer survivors (CACS) using word co-occurrence network analysis on studies registered in the Korean Citation Index (KCI). Methods: This word co-occurrence network analysis study explored major research trends by constructing a network based on relationships between keywords (semantic morphemes) in the abstracts of published articles. Research articles published in the KCI over the past 10 years were collected using the Biblio Data Collector tool included in the NetMiner Program (version 4), using "cancer survivors", "adolescent", and "child" as the main search terms. After pre-processing, analyses were conducted on centrality (degree and eigenvector), cohesion (community), and topic modeling. Results: For centrality, the top 10 keywords included "treatment", "factor", "intervention", "group", "radiotherapy", "health", "risk", "measurement", "outcome", and "quality of life". In terms of cohesion and topic analysis, three categories were identified as the major research trends: "treatment and complications", "adaptation and support needs", and "management and quality of life". Conclusion: The keywords from the three main categories reflected interdisciplinary identification. Many studies on adaptation and support needs were identified in our analysis of nursing literature. Further research on managing and evaluating the quality of life among CACS must also be conducted.

• 한국학교보건학회지
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• 제28권2호
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• pp.99-110
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• 2015

Purpose: This study aims to investigate the association between suicidal thoughts and the co-occurrence of alcohol, tobacco, and drug use among adolescents. Methods: This study used the data of the Korea Youth Risk Behavior Web-based Survey from 2008 through 2014. The subjects of this study were 517,866 students, in total (Male 266,500, Female 251,366). Frequency analysis was conducted on the data about the subjects' general characteristics and their experience of smoking, drinking, and drug use. The relationship between suicidal thoughts and the co-occurrence of alcohol, tobacco, and drug use was analyzed through ${\chi}^2-test$ and logistic regression. The analyses were done using SAS 9.4. Results: According to the study, adolescents who used alcohol, cigarettes, and drugs at the same time engaged in suicidal ideation 3.69 times more than their peers who didn't use such substances (95% CI: 3.40~4.00, p<.001). Also, adolescents who used only tobacco, only alcohol, and only drugs engaged in suicidal ideation 1.49 times (95% CI: 1.43~1.56, p<.001), 1.28 times (95% CI: 1.26~1.31, p<.001) and 2.34 times (95% CI: 2.04~2.69, p<.001) more than the students who didn't use any substances, respectively. Conclusion: Adolescents' suicidal ideation and the co-occurrence of alcohol, tobacco, and drug use had a statistically significant relationship.

• 과학기술학연구
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• 제15권1호
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• pp.45-67
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• 2015

이 글은 위험커뮤니케이션의 지형과 과학기술 시티즌십을 두 축으로 삼아 대안부재 담론이 여전히 사회적 영향력을 유지하고 있는 이유를 밝히고자 한다. 이를 위해 (1) 공동출현 핵심어(co-occurrence keywords)의 빈도수 측정, (2) 과학기술 시민인식 설문조사를 분석하였다. 먼저, 빈도수 측정을 통해 후쿠시마 원전사고 직후 드러난 위험커뮤니케이션의 지형을 살펴보고 있다. 그런 다음, 설문조사 결과를 분석하여 원자력발전에 대한 시민 인식을 간략하게 정리하고, 원자력을 둘러싼 과학기술 시티즌십의 현주소를 파악하고 있다. 마지막으로, 이상의 분석 결과를 다시 정리하면서 종합해주고 있다. 그로부터 원자력 거버넌스의 작동방식을 이해하고, 그 개선점을 찾고 있다.

• Journal of Korean Neurosurgical Society
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• 제39권2호
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• pp.109-113
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• 2006

Objective : Meningioma is a benign tumor which has a high occurrence rate of postoperative hematomas. The purpose of this study is to analyze risk factors for postoperative hemorrhages after meningioma surgery. Methods : One hundred and fifty three patients with intracranial meningiomas, operated at the Department of Neurosurgery, National Medical Center, between January 1995 and December 2003 were included in this retrospective study. Risk factors considered to be related with postoperative hematomas were age, sex, preoperative pharmacological anticoagulants for medical co-morbidity, tumor location, histological type of the meningioma, infiltration of dural sinus and arachnoid, removal range of tumors, and the perioperative coagulation status including prothrombin time, partial thromboplastin time, and platelet count. Results : Patients' aged more than 70 years with a platelet count of less than $150{\times}10^9{\ell}^{-1}$ after surgery had statistically significant relations to the occurrence rate of postoperative hematomas. The other factors had no statistical significance. Conclusion : Various and intensive preoperative examinations for coagulation factors of patients, especially of older age, and proper transfusion before meningioma surgery are necessary for preventing postoperative hematoma.

• 한국지능시스템학회논문지
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• 제25권2호
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• pp.174-179
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• 2015

동적 위치제어 시스템(Dynamic Positioning System)의 위험성과 신뢰성 평가에 FMEA(Failure Mode and Effect Analysis)를 적용하고 있으나, 해양 프로젝트가 가진 특징으로 인해 다음과 같은 한계를 가진다. 1) SCADA(Supervisory Control and Data Acquisition) 시스템을 통해 수집되는 고장 데이터의 일부는 환경의 영향으로 인한 오작동이나 단순한 센서고장으로 인해 생성되는 데이터를 포함하고 있으므로 불완전하고 신뢰할 수 없다. 따라서, FMEA의 세 가지 변수인 심각도(Severity), 발생빈도(Occurrence), 검출빈도(Detection)의 평가는 전문가 지식에 근거한다. 2) 전문가들의 주관적인 판단에 전적으로 의존할 경우 위험 요소들을 정밀하게 평가하기 어렵다. 3) 위험 요소들 사이의 상대적인 중요도는 고려되지 않아 위험우선순위가 명료하게 표현되지 않는다. 4) 서로 다른 고장모드에 대해 동일한 위험 우선순위 값을 가질 경우 상대적인 중요도를 판단하기 어렵다. 이러한 문제점을 극복하고 기존의 FMEA의 효과를 높이기 위해, Fuzzy-FMEA를 제안하고, 선박/해양 프로젝트의 동적 위치제어 시스템의 FMEA 문서에 적용하였다. 본 논문은 DP FMEA, DP FMEA 입증 시험서(DP FMEA Proving Trials)에 나타낸 전문가 지식을 퍼지 모델로 구현하여 FMEA 위험우선순위(RPN; Risk Priority Number)에 위험요소들의 상대적인 중요성을 포함시켰다. 제안한 방법은 해양 프로젝트의 동적 위치제어 시스템의 기계 및 전장 장비에 적용하여 기존의 FMEA와 비교하였다.