• 시큐리티연구
• /
• 제45호
• /
• pp.221-242
• /
• 2015

본 연구는 노인의 삶의 질에 악영향을 미치는 범죄피해두려움에 대하여 영향요인과 인과관계를 규명하여 노인대상 범죄를 예방하기 위한 방향성을 제시하는 것을 연구의 목적으로 한다. 특히, 위험해석모델을 바탕으로 구성한 범죄 위험인지와 행동적 반응을 통한 범죄두려움까지의 경로관계를 노인의 범죄두려움에도 적용할 수 있는 지 확인하였다. 분석 결과. 첫째, 사회적 특성인 무질서 요인은 범죄에 대한 인지 및 행동적 반응, 범죄두려움에 통계적으로 유의한 영향력을 가졌다. 둘째, 범죄피해경험 중 직접적 범죄피해경험은 범죄에 대한 인지에만 영향을 미쳤으나 간접적 범죄피해경험은 범죄에 대한 인지와 범죄두려움에 유의한 영향력을 가졌다. 셋째, 범죄에 대한 인지는 행동적 반응에 유의한 영향력을 가졌다. 넷째, 범죄에 대한 인지는 범죄에 대한 두려움에 유의한 영향력을 가졌다. 다섯째, 행동적 반응은 범죄에 대한 두려움에 영향을 미친다. 이와 같은 분석결과는 위험해석모델이 노인의 범죄두려움에도 적용이 된다는 것을 의미하며 사회적 특성인 무질서 요인과 개인적 특성인 범죄피해경험은 노인으로 하여금 범죄위험을 인지하게 하고 행동적 반응을 가져오게 하며 최종적으로 범죄두려움에 영향을 미치는 요인임을 알 수 있었다. 따라서 본 연구는 노인의 범죄두려움을 감소시키고 삶의 질 향상을 위해 지역사회환경에 대한 정화가 필요하며 범죄피해를 당한 노인에 대한 지원정책이 필요하다는 점을 강조하였다.

• 한국환경성돌연변이발암원학회지
• /
• 제19권2호
• /
• pp.108-111
• /
• 1999

Correlation between the tumorigenic dose (TD) and the maximum tolerated dose (MTD) was examined to search for the most relevant TD values related to the MTD. Using benzo(a)pyrene (B(a)P) 2-yr bioassay data, correlation coefficients between values of $TD_{1-}$50/ and the MTD were estimated from linearized or non-linearlized dose-response curves. The highest correlation coefficients (0.9966-1.0000) were obtained from T $D_{1-}$10/ in linearized dose-response curves while the highest (0.9966-1.0000) were estimated from $TD _{5-}$10/ in non-linearized dose-response eurves. These data suggest that TDs-lo were more closely related to the MTD than the ,$TD_{5-}$10/ in B(a)P 2-yr bioassay and that in lieu of the $TD_{50}$ they could be efficiently applicable to risk assessment and management.ent.

• 대한안전경영과학회지
• /
• 제17권2호
• /
• pp.67-78
• /
• 2015

The purpose of the establishment of corporation's Business Continuity Plan(BCP) is to maintain corporations' own business and establish the response plan in order to resume operation in a short time period when crisis situations occur due to natural disaster and human error. This study has presented all types of procedures and criteria which are needed to establish the airport crisis response system in order to maintain the business continuity by utilizing BCP technique. Basically the risk response procedures must be established in the process of (1) preparation stage, (2) plan development stage, (3) documentation stage, (4) test & maintenance stage. The guideline has been suggested that each stage must be carried out in the sequence of Policy & Planning Responsibility, Business Impact Analysis, Recovery Strategy & Plans, Emergency Plan & SOP, Training Awareness and Maintenance & Review

• International Journal of Computer Science & Network Security
• /
• 제24권5호
• /
• pp.205-211
• /
• 2024

The increasing number of botnet attacks incorporating new evasion techniques making it infeasible to completely secure complex computer network system. The botnet infections are likely to be happen, the timely detection and response to these infections helps to stop attackers before any damage is done. The current practice in traditional IP networks require manual intervention to response to any detected malicious infection. This manual response process is more probable to delay and increase the risk of damage. To automate this manual process, this paper proposes to automatically select relevant countermeasures for detected botnet infection. The propose approach uses the concept of flow trace to detect botnet behavior patterns from current and historical network activity. The approach uses the multiclass machine learning based approach to detect and classify the botnet activity into IRC, HTTP, and P2P botnet. This classification helps to calculate the risk score of the detected botnet infection. The relevant countermeasures selected from available pool based on risk score of detected infection.

• 한국지진공학회논문집
• /
• 제13권6호
• /
• pp.39-46
• /
• 2009

구조물의 지진취약도 분석을 위해서는 평가용 지반응답스펙트럼의 선택이 중요한 영향을 미친다. 본 연구에서는 기존의 설계응답스펙트럼을 이용하여 평가된 전력설비에 대하여 등재해도 스펙트럼을 이용하여 취약도 변수를 치환하는 방법을 제시하였다. 제시된 방법을 이용하여 기존의 전력설비를 대상으로 도출된 고신뢰도저파손확률값(HCLPF)을 비교하였으며, 최종적으로 지진재해도 곡선을 이용하여 전력설비에 대한 정량적 지진위험도를 도출하였다. 결과적으로 설계응답스펙트럼을 이용한 지진위험도 평가는 전력설비의 지진위험도를 보수적으로 판단할 수 있는 것으로 평가되었다.

• Earthquakes and Structures
• /
• 제16권6호
• /
• pp.705-714
• /
• 2019

Seismic assessment of underground structures is one of the challenging problems in engineering design. This is because there are usually many sources of uncertainties in rocks and probable earthquake characteristics. Therefore, for decreasing of the uncertainties, seismic response of underground structures should be evaluated by sufficient number of earthquake records which is scarcely possible in common seismic assessment of underground structures. In the present study, a practical risk-based approach was performed for seismic risk assessment of an unsupported tunnel. For this purpose, Incremental Dynamic Analysis (IDA) was used to evaluate the seismic response of a tunnel in south-west railway of Iran and different analyses were conducted using 15 real records of earthquakes which were chosen from the PEER ground motion database. All of the selected records were scaled to different intensity levels (PGA=0.1-1.7 g) and applied to the numerical models. Based on the numerical modeling results, seismic fragility curves of the tunnel under study were derived from the IDA curves. In the next, seismic risk curve of the tunnel were determined by convolving the hazard and fragility curves. On the basis of the tunnel fragility curves, an earthquake with PGA equal to 0.35 g may lead to severe damage or collapse of the tunnel with only 3% probability and the probability of moderate damage to the tunnel is 12%.

• 한국환경보건학회지
• /
• 제47권2호
• /
• pp.155-165
• /
• 2021

Objectives: Acute exposure to high concentrations of chemicals can occur when a chemical accident takes place. As such exposure can cause ongoing environmental pollution, such as in the soil and groundwater, there is a need for a tool that can assess health effects in the long term. The purpose of this study was assessing the health risks of residents living near a chemical accident site due to long-term exposure while considering the temporal concentration changes of the toxic chemicals leaked during the accident until their extinction in the environment using a multimedia environmental dynamics model. Methods: A health risk assessment was conducted on three cases of formaldehyde chemical accidents. In this study, health risk assessment was performed using a multimedia environmental dynamics model that considers the behavior of the atmosphere, soil, and water. In addition, the extinction period of formaldehyde in the environment was regarded as extinction in the environment when the concentration in the air and soil fell below the background concentration prior to the accident. The subjects of health risk assessment were classified into four groups according to age: 0-9 years old, 10-18 years old, 19-64 years old, and over 65 years old. Carcinogenic risk assessment by respiratory exposure and non-carcinogenic risk assessment by soil intake were conducted as well. Results: In the assessment of carcinogenic risk due to respiratory exposure, the excess carcinogenic risk did not exceed 1.0×10-6 in all three chemical accidents, so there was no health effect due to the formaldehyde chemical accident. As a result of the evaluation of non-carcinogenic risk due to soil intake, none of the three chemical accidents had a risk index of 1, so there was no health effect. For all three chemical accidents, the excess cancer risk and hazard index were the highest in the age group 0-9. Next, 10-18 years old, 65 years old or older, and 19-64 years old showed the highest risk. Conclusion: This study considers environmental changes after a chemical accident occurs and until the substance disappears from the environment. It also conducts a health risk assessment by reflecting the characteristics of the long-term persistence and concentration change over time. It is thought that it is of significance as a health risk assessment study reflecting the exposure characteristics of the accident substance for an actual chemical accident.

• Nuclear Engineering and Technology
• /
• 제19권4호
• /
• pp.292-309
• /
• 1987

미국 원자력 안전규제위원회(U.S. NRC)의 "원자로 위험도 참고문서(NUREG-1150)"에 입력자료로 제공하기 위해 실시한 Zion발전소 안전성 재평가 작입의 일환으로, 가상적 중대사고에 대한 대형건식 가압경수로 격납용기 반응해석을 수행하였다. 본 연구에서 사용한 방법론들은 Sandia 국립연구소에서 "중대사고 위험도 감소계획"의 일환으로 특히 Surry 발전소에 대한 연구를 위해 개발한 것이며, 이 방법론을 Zion발전소에 외삽법으로 적용하였다. 먹저, 원자력발전소의 위험도를 정량적으로 평가하는 주요절차를 개설하였다. 그리고, Zion발전소의 중대사고에 대한 격납용기 반응해석을 위해 사용한 방법론들을 상세히 기술하였다. 즉, 격납용기 반응해석을 위해 사용한 방법론들을 상세히 기술하였다. 즉, 격납용기 사건수목 해석 전산코드의 주요 특징과 격납용기 사건수목의 정량적 평가절차를 요약하여 높액다. 격납용기 반응해석에 있어서 중요한 발전소 고유의 특성과 본 연구의 불확실성 분석에 포함시킨 격납용기 하중과 성능에 관계되는 문제점들을 아울러 제시하였다. 끝으로, 가상적 증대사고에 대한 대형건식 가압경수로 격납용기의 반응에 대한 전망을 제공하기 위해서 결정적 및 통계학적 격납용기 사건수목 해설결과를 간단히 요약하여 제시하였다.설결과를 간단히 요약하여 제시하였다.

• Asian Pacific Journal of Cancer Prevention
• /
• 제14권5호
• /
• pp.2753-2758
• /
• 2013

Various studies examining the relationship between Ezrin overexpression and response to chemotherapy and clinical outcome in patients with osteosarcoma have yielded inconclusive results. We accordingly conducted a meta-analysis of 7 studies (n = 318 patients) that evaluated the correlation between Ezrin and histologic response to chemotherapy and clinical prognosis (death). Data were synthesized in receiver operating characteristic curves and with fixed-effects and random-effects likelihood ratios and risk ratios. Quantitative synthesis showed that Ezrin is not a prognostic factor for the response to chemotherapy. The positive likelihood ratio was 0.538 (95% confidence interval [95% CI], 0.296- 0.979; random-effects calculation), and the negative likelihood ratio was 2.151 (95% CI, 0.905- 5.114; random-effects calculations). There was some between-study heterogeneity, but no study showed strong discriminating ability. Conversely, Ezrin positive status tended to be associated with a lower 2-year survival (risk ratio, 2.45; 95% CI, 1.26-4.76; random-effects calculation) with some between-study heterogeneity that disappeared when only studies that employed immunohistochemistry were considered (risk ratio, 2.97; 95% CI, 2.01- 4.40; fixed-effects calculation). To conclude, Ezrin is not associated with the histologic response to chemotherapy in patients with osteosarcoma, whereas Ezrin positivity was associated with a lower 2-year survival rate regarding risk of death at 2 years. Expression change of Ezrin is an independent prognostic factor in patients with osteosarcoma.

• 대한토목학회논문집
• /
• 제34권6호
• /
• pp.1815-1829
• /
• 2014

최근 빈번하게 발생하는 노후 필댐의 붕괴 사고로 인해 안전관리에 대한 사회적 관심이 높아지고 있다. 지금까지 국내에서는 설계 당시 보수적인 설계기준에 근거한 설계 홍수량을 기준으로 필댐의 안정성을 단순하게 평가하고 있다. 하지만 해외 주요 국가에서는 사건수 분석 기법과 같은 체계적인 위험도 평가 기법을 도입하여 이미 오랜 기간 동안 필댐을 관리 운영하고 있다. 본 연구에서는 노후화된 국내 필댐의 체계적인 위험도 분석을 위해 사건수 분석 기법을 이용한 미공병단 내부 침식 평가 기법을 적용하여 필댐의 내부 침식에 대한 지반공학적 시스템 반응 확률을 분석하였다. 본 연구 결과는 지반공학적 시스템 반응 확률이 결함의 존재 확률과 동수경사의 크기에 가장 큰 영향을 받으며 노후된 필댐의 위험도를 정량적으로 평가할 수 있음을 보여준다.