• Title, Summary, Keyword: risk rating

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Development of Risk Rating and Index for Coastal Activity Locations

  • Lee, Young-Jai;Jung, Cho-Young;Gu, Ja-Yeong
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.26 no.3
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    • pp.227-232
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    • 2020
  • This paper develops a risk index based on an indicator of risk assessment in terms of coastal activity location and accident type. The risk index is derived from a formula which adds the consequence of failure to a vulnerability value, then subtracts the mitigation value. Specifically, the consequence of failure is the number of casualties in coastal activity locations. An indicator of vulnerability refers to coastal environment elements and social elements. A pointer of mitigation includes managerial and organizational elements that indicate the capabilities of coastal activities. A risk rating of coastal activity location is found from a risk matrix consisting of the accident location and type. The purpose of this study is to prevent accidents at coastal activity locations by allowing the Coastal police guard to monitor effectively and inform visitors of potential risks.

Analysis on Ampacity of Overhead Transmission Lines Being Operated

  • Yan, Zhijie;Wang, Yanling;Liang, Likai
    • Journal of Information Processing Systems
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    • v.13 no.5
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    • pp.1358-1371
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    • 2017
  • Dynamic thermal rating (DTR) system is an effective method to improve the capacity of existing overhead line. According to the methodology based on CIGRE (International Council on Large Electric systems) standard, ampacity values under steady-state heating balance can be calculated from ambient environmental conditions. In this study, simulation analysis of relations between parameters and ampacity is described as functional dependence, which can provide an effective basis for the design and research of overhead transmission lines. The simulation of ampacity variation in different rating scales is described in this paper, which are determined from real-time meteorological data and conductor state parameters. To test the performance of DTR in different rating scales, capacity improvement and risk level are presented. And the experimental results show that the capacity of transmission line by using DTR has significant improvement, with low probability of risk. The information of this study has an important reference value to the operation management of power grid.

Development of Intelligent Credit Rating System using Support Vector Machines (Support Vector Machine을 이용한 지능형 신용평가시스템 개발)

  • Kim Kyoung-jae
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.9 no.7
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    • pp.1569-1574
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    • 2005
  • In this paper, I propose an intelligent credit rating system using a bankruptcy prediction model based on support vector machines (SVMs). SVMs are promising methods because they use a risk function consisting of the empirical error and a regularized term which is derived from the structural risk minimization principle. This study examines the feasibility of applying SVM in Predicting corporate bankruptcies by comparing it with other data mining techniques. In addition. this study presents architecture and prototype of intelligeht credit rating systems based on SVM models.

Study on the Estimation of Seasonal Ambient Current for the Application of Ambient Adjusted Line Rating(AAR) in Overhead Transmission Lines Using Risk Tolerance(RT) Method (가공송전선로의 AAR 적용 시 Risk Tolerance 분석을 이용한 계절별 최대 허용전류 산정 및 적용에 관한 연구)

  • Lee, Jaegul;Bae, Youngjae;Song, Jiyoung;Shin, Jeonghoon;Kim, Yonghak;Kim, Taekyun;Yoon, Yongbeum
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.66 no.1
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    • pp.7-15
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    • 2017
  • Ambient Adjusted line Rating(AAR) method for overhead transmission lines considering Risk Tolerance(RT) was proposed in this paper. AAR is suitable for system operators to plan their operation strategy and maintenance schedule because this can be designed as a seasonal line rating. Several candidate transmission lines are chosen to apply the proposed method in the paper. As a result, it is shown that system reliability was significantly enhanced through maximizing transfer capability, solving the system constraints.

Prediction of Dynamic Line Rating Based on Thermal Risk Probability by Time Series Weather Models (시계열 기상모델을 이용한 열적 위험확률 기반 동적 송전용량의 예측)

  • Kim, Dong-Min;Bae, In-Su;Cho, Jong-Man;Chang, Kyung;Kim, Jin-O
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.55 no.7
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    • pp.273-280
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    • 2006
  • This paper suggests the method that forecasts Dynamic Line Rating (DLR). Thermal Overload Risk Probability (TORP) of the next time is forecasted based on the present weather conditions and DLR value by Monte Carlo Simulation (MCS). To model weather elements of transmission line for MCS process, this paper will propose the use of statistical weather models that time series is applied. Also, through the case study, it is confirmed that the forecasted TORP can be utilized as a criterion that decides DLR of next time. In short, proposed method may be used usefully to keep security and reliability of transmission line by forecasting transmission capacity of the next time.

Development of Rock Slope Risk Rating System for the Determination of the Priority of Investment (도로절개면 투자우선순위 결정기법 개발)

  • 구호본;박혁진;민기복;정의진;김춘식;박성욱
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.411-418
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    • 2000
  • With the limited amount of budget and time, it is required to determine the priority of investment when there are a large number of hazardous slopes. In this paper, the Rock Slope Risk Rating System is developed based on the combination of the hazard of failure and the damage potential. By applying the proposed rating system to 253 rock slopes in Korean National Highway, it was possible to determine the priority of investment on road cut slopes.

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Management Approach Based on Quantitative Risk Assessment (정량적 리스크 평가를 기초로 한 경영관리)

  • Jung, Won
    • Journal of Applied Reliability
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    • v.8 no.4
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    • pp.167-179
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    • 2008
  • System risk is the totality of all safety risks to customers, employees, suppliers, and other third parties that arise due to system operations. To assess the risk of major hazards with the potential to cause fatality to the customers and other members of the public, quantitative risk assessment methodologies are used. This paper presents the general principles of risk based management approach to improve the safety of high risk systems such as aviation, railway, and nuclear power plants. For the suitable risk control arrangement, case studies of acceptable risk level, risk rating matrix, and safety management philosophy are presented.

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A Study on the Direction for Developing the Korean PDRI(Project Definition Rating Index) (한국형 PDRI(Project Definition Rating Index)기법 개발 방향)

  • Hong, Sim-Hee;Yu, Jung-Ho
    • Proceedings of the Korean Institute of Building Construction Conference
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    • pp.168-169
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    • 2016
  • Risk management at an early stage of projects is known as an effective method expected various benefits. The PDRI(Project Definition Rating Index) by the CII(Construction Industry Institute) is defined project scope for reducing risks. In addition, the PDRI is one of the verified methods for achieving benefits by a risk management. The literature review in Korea about risk management is all about focusing on construction works and the construction phase. Thus, we need to extend the perspective of a project management such as the PDRI. To develop the Korean PDRI, However, we have to consider Korean situations. Therefore, in this study, we analyze some previous studies of PDRI' indexes and its using methods, and suggest the new direction for using PDRI in Korea. This method will enable to improve the scoring method of a project management with PDRI in Korea.

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Government Necessity of Risk Rating Methodology for Nationwide Emerging IT Infrastructure (국가단위 신규 IT인프라의 위험수준 등급화모델에 대한 정책적 필요성)

  • Kim, Sang-Kyun
    • Proceedings of the Korean Society of Computer Information Conference
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    • pp.285-287
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    • 2010
  • 국가단위로 구축예정인 신규 IT인프라의 계획 및 설계 단계에서 신규 IT인프라에 잠재하는 위험도를 사전에 종합적으로 분석하기 위하여 현재까지는 위험분석 이론이 사용되고 있으나 여러 가지 적용상 한계점이 지적되고 있다. 본 연구는 이와 관련하여 신규 IT인프라의 위험도를 일정 단위의 등급으로 분류하여 정부기관, 서비스 제공자, 서비스 수요자가 정확하게 인지하고 대응할 수 있도록 하기 위하여 신규 IT인프라에 대한 위험수준 등급화 모델의 필요성을 제시하는 것이 목적이다.

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A Study on the Strategy of Platform Operator for Free Mobile Data : from the Perspectives of Business Opportunity and Risk (모바일 데이터 비과금에 대한 플랫폼사업자의 전략에 관한 연구: 사업기회 및 위기 관점에서)

  • Cho, Dae-Keun;Song, In-Kuk
    • Journal of Internet Computing and Services
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    • v.18 no.5
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    • pp.123-131
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    • 2017
  • With the rapid growth of mobile services, the various charging methods for mobile data have emerged in the mobile service market. Among them, network operators have begun to provide the zero-rating without any extra charge for the data that use the specific mobile application & services. Zero-rating, the free mobile data services by the network operators provoked many platform operators to confront business opportunity and risk. Though the platform operators are in urgent need of the strategy planning that considers business environments, any research endeavors explaining zero-rating and platform does not exist. Moreover, the analyses of potential effects of zero-rating on the business acts of platform operators has not been performed. Therefore, the study aims to identify the potential business opportunity and risk to prepare the various strategic countermeasure in platform operators' shoes. The study might enable the researchers to properly understand zero-rating and platform, and be utilized as a reference in planning the business strategy of the platform operators.