مدل تجزیه و تحلیل حوادث بر اساس شبکه بیزی و روش استدلال آشکار
|کد مقاله||سال انتشار||مقاله انگلیسی||ترجمه فارسی||تعداد کلمات|
|29190||2013||12 صفحه PDF||سفارش دهید||7576 کلمه|
Publisher : Elsevier - Science Direct (الزویر - ساینس دایرکت)
Journal : Journal of Loss Prevention in the Process Industries, Volume 26, Issue 1, January 2013, Pages 10–21
In this paper, an accident analysis model is proposed to develop the cost-efficient safety measures for preventing accidents. The model comprises two parts. In the first part, a quantitative accident analysis model is built by integrating Human Factors Analysis and Classification System (HFACS) with Bayesian Network (BN), which can be utilized to present the corresponding prevention measures. In the second part, the proposed prevention measures are ranked in a cost-effectiveness manner through Best-Fit method and Evidential Reasoning (ER) approach. A case study of vessel collision is analyzed as an illustration. The case study shows that the proposed model can be used to seek out accident causes and rank the derived safety measures from a cost-effectiveness perspective. The proposed model can provide accident investigators with a tool to generate cost-efficient safety intervention strategies. Graphical abstract Full-size image (20 K) Figure options Highlights ► Proposes an accident analysis model to develop cost-efficient safety measures. ► Integrate Human Factors Analysis and Classification System with Bayesian Network. ► BN is developed up to risk ranking and measures identification and effectiveness. ► Best-Fit and Evidential Reasoning are applied to rank the cost-effectiveness of measures. ► AHP and decomposition method are integrated to estimate conditional probabilities.
When an accident occurs, it is important to understand the root cause in order to take effective preventive measures. Accident analysis always implies an accident model is a set of assumptions of what the underlying “mechanisms” are (Hollnagel, 2002). An accident model is an abstract conceptual representation of the occurrence and development of an accident; it describes the way of viewing and thinking about how and why an accident occurs (Huang, Ljung, Sandin, & Hollnagel, 2004). Accident model is also a very important process for providing input to the development of proactive and cost-effectiveness safety measures (Psarros, Skjong, & Vanem, 2010). There are extensive literatures about accident model, most of which analyzes accidents using conceptual representation or summary statistics. For example, Wang, Pillay, Kwon, Wall, and Loughran (2005) carried out marine accident analysis to determine the most common causes of accidents on fishing vessels using accident data collected from the Marine Accident Investigation Branch. They carried out a statistical study of accident type, deaths and vessels lost in period from 1994 to 1999, which showed that there was a real safety problem in the fishing vessel industry. Similarly, Toffoli, Lefevre, Bitner-Gregersen, and Monbaliu (2005) investigated 270 ship accidents reported as being caused by bad weather to contribute toward the definition of adequate warning criteria. Antão, Almeida, Jacinto, and Soares (2008) analyzed the sequence of events leading to accidents using historical data. Summary statistics are important but not sufficient to explain the accident. However, the existing accident models lack the capability of proposing and ranking cost-efficient safety measures in preventing the occurrence of accidents. To improve the existing models, this paper presents an extended accident analysis model by integrating 4 methods which consist of Human Factors Analysis and Classification System (HFACS), Bayesian Network (BN), Best-Fit and Evidential Reasoning (ER) method. HFACS is a reliable human error analysis method that is able to assist investigators in the identification of human and organizational factors and their relationships in an accident (Wiegmann & Shappell, 2003). However, HFACS remains as a qualitative model. This weakness is overcome by the quantitative calculation of BN in this study. At the same time, the HFACS' 4-level structure provides a systematic guideline in the construction of BN to model how human errors are related to form a network. With a hierarchy of nodes and states defined, BN, which represents the relationship among the human errors, can be constructed. In the HFACS model, human errors at a particular level directly influence human errors at the next lower level. This relationship depicted in the HFACS will be mapped onto the BN via its graphical representation with edges connecting nodes at a particular level to those located one level below. The BN is systematically constructed with the help of the HFACS' hierarchal structure. The purpose of CBA is to compare the costs and benefits associated with the implementation of safety measures. There are many papers carrying out safety assessment using formal safety assessment (FSA) method, in line with well-established cost-effectiveness criteria (IMO, 1997; Norway, 2000). For instance, Lois, Wang, Wall, and Ruxton (2004) selected cost-effectiveness risk control options after CBA using risk matrix approach and expert judgment. Psarros et al. (2010) also used FSA to investigate cost-effectiveness criteria whether can be used to evaluate safety measures. Vanem and Ellis (2010) presented an evaluation of the cost-effectiveness of a novel passenger monitoring system using FSA. Their analysis found that the cost-effectiveness criterion could be considered as the best candidate. Evidence showed that the cost-effectiveness approach was practical by including examples of successful applications in actual risk assessments. However, some experts pointed out that CBA, as suggested for use in FSA, was not a precise science but a way of evaluation. It might not be used mechanistically, but only as a consulting instrument in decision making (Wang & Foinikis, 2001). In previous works, common limitations were present when carrying out CBA, which mainly came from unavailability of data and uncertainty. To deal with it, Yang, Wang, Bonsall, and Fang (2009) proposed a subjective security-based assessment and management framework using fuzzy evidential reasoning (ER) approach. Several types of uncertainty such as ignorance and fuzziness can be consistently modeled using the ER method (Guo, Yang, Chin, & Wang, 2006). The ER approach provides a procedure for aggregating calculations, which can preserve the original features of multiple attributes with various types of information. It provides a solution for processing subjective risk assessment possibly with academic bias resulting from various opinions of different individuals. However, these works paid little attention to the calculation of risk reduction achieved by implementing the safety measures. In this paper, an ER-based CBA method considering risk reduction is proposed to combine CBA with risk assessment. Lessons learned from accidents are important for identifying weaknesses in the present system and avoiding them in future (European Communities, 2001). For existing accident models, the quantitative analysis for accidents and cost-effectiveness analysis for safety measures are not sufficient. As a response, an extended accident analysis model is constructed to seek accident causes and propose cost-effectiveness safety measures in this paper. The remainder of this paper is organized as follows: In Section 2, an accident analysis model is constructed and illustrated in detail. Section 2.1 and Section 2.2 present how to analyze accidents by integrating HFACS with BN. Section 2.3 carries out cost-effectiveness assessment of the proposed safety measures using Best-Fit method and ER approach. In Section 3, an illustrative study is conducted to demonstrate the feasibility of applying the model in the area of vessel collision.
نتیجه گیری انگلیسی
This paper proposes an accident analysis model, which can be used to identify the leading accident causes and, thereafter, to propose the most cost-efficient safety measures to prevent the occurrence of accidents. In the first part of the model, we jointly taps on the abilities of HFACS and BN for investigating causes and proposing the corresponding prevention measures. In the second part, we use Best-Fit method and ER approach to rank the proposed safety measures from a cost-effectiveness perspective. The case study of the vessel collision accident shows the effectiveness of the proposed model. The ER-based CBA method not only allows experts to express their subjective judgments using belief structures, but also allows experts' judgment to be aggregated in a rigorous yet nonlinear rather than linear manner. The accident analysis model has the ability to quantitatively evaluate the safety measures to facilitate the decision-making for preventing accidents. Due to the lack of reliable historical data, it is difficult to calculate the exact cost and benefit associated with the implementation of safety measures. In this circumstance, many fuzzy models are proposed to evaluate the cost and benefit according to expert estimations. Although fuzzy models can be applied to estimate the comparative rankings more easily, the expert judgments are more or less subjected to biases. In our future work, we will gather enough reliable statistical data to get the real cost and benefit of safety measures. In addition, the model will be further improved to be able to carry out general analysis of all kinds of accidents. We will focus on seeking out exhaustive accident causes and summarizing the generic cost-effectiveness safety measures for each type of accident basing on more case studies and empirical data.