An inductive reasoning approach for building system safety risk models of aviation accidents

An inductive reasoning approach is employed to develop a prototype hybrid decision support tool whose main objective is to build probabilistic causal models representing the safety risk involved in aviation accidents. In this context, 15 aircraft accidents representative of five major accident types are selected to build an initial seed for the case‐base of the prototype tool. Consequently, within each individual accident model, main clusters of causal factors are identified for inclusion in the initial seed, thereby improving, both quantitatively and qualitatively, the case‐base of the prototype tool. A new methodology developed specifically for indexing aviation accidents into databases is used for indexing the initial seed into the case‐base of the tool. The resulting product is a highly customized conversational decision support tool that provides solution possibilities in the form of probabilistic causal models of accident scenarios retrieved and ranked according to their similarity to the current accident that the intended user investigates.     

运用贝叶斯网络量化和控制商业银行操作风险——一个基于实际业务流程的例子

操作风险量化是为降低和控制风险服务的。运用贝叶斯网络分析量化操作风险并改进控制,对提升商业银行的操作风险管理水平是一条有效途径。论文以我国银行的一个典型业务—远期结售汇为例,研究了实践中建立和运用贝叶斯网络来估计操作风险发生频率的具体方法。以流程分析和映射为基础,阐述了风险映射与节点识别、网络结构建立、网络节点描述、节点赋值的实施步骤,并说明了利用贝叶斯网进行因果推理和诊断推理的方法。     

基于贝叶斯网络的上市证券公司风险预警模型研究

上市证券公司的风险预警模型能够为政府监管、证券公司稳健发展以及投资者研判提供依据。以上市证券公司风险管理指标体系为基础,利用贝叶斯网络方法以及支持向量机、随机森林和多项Logit模型分别建立风险预警模型进行比较,并在实证中针对上市证券公司的不平衡数据特征,用 SMOTE抽样对数据进行预处理。最终实证表明：从平均准确率和标准差两个角度比较,SOMTE抽样增加了贝叶斯网络的预测效果,机器学习方法要优于多项Logit模型,贝叶斯网络方法效果最佳。     

The relationship between risk control imperative and perceived causation: the case of product counterfeiting in China

The counterfeiting of safety critical products such as pharmaceuticals is a significant risk to public safety, but the literature suggests that much of the causation of counterfeiting is endogenous: the decisions of legitimate producers and consumers facilitate or incentivize the manufacture of counterfeits. This study examined what effect the perceived causation of counterfeiting risk (both the causes of counterfeiting, and the consequences caused by counterfeiting) had on the risk control imperative: the belief that more resources should be allocated to controlling this risk. This involved a questionnaire survey of individuals in China, asking them to respond to the risks arising from the counterfeiting of specific safety-critical product types. The study found that although some causes of counterfeiting were emphasized much more strongly than others (notably the failure of the authorities, profiteering among legitimate producers and the presence of criminal organizations), the less emphasized causes were still judged as being relevant. The study found that the association between the risk control imperative and both the perceived scale of risk and its causal origins varied across different product types. In one case, the scale of risk was virtually unrelated to control imperative, but in all cases, at least one of the causal factors, and at least one of the consequential factors, explained variation in control imperative. A qualitative comparative analysis also indicated specifically that control imperative was lower if an actor who was strongly implicated in the cause of the risks was also a bearer of the risks.     

网络的安全管理

本文叙述了网络在操作系统、计算机网络、数据库管理系统、应用系统等在安全方面存在的漏洞。描述了怎样对网络安全进行风险评估,并提出了网络安全管理的模型———可适应性网络管理模型。     

Engagement on risk and uncertainty – lessons from coastal regions of Fukushima Prefecture,Japan after the 2011 nuclear disaster?

This paper uses the case study of the south-east coast of Fukushima Prefecture in Japan to draw lessons for risk communication under situations of high uncertainty and conditions of varying trust. Based on an existing field of research into the social and ethical aspects of governing risks around environmental radioactivity, empirical qualitative material collected in Fukushima Prefecture over 2014 and 2015 is analysed around three key questions: who is undertaking risk communication and how they are perceived (in particular their motivations and perceived competence); what is the purpose of engagement with citizens and stakeholders on risk and uncertainty (i.e. whether it is to ‘convince’ people or allow them to come to their own informed decision); and whether risk communication may be considered responsive to the needs of the affected populations. The findings are then applied to Kasperson’s four questions for the future of risk communication in order to assess their wider implications. Particular attention is paid to how the individual or institution conveying the risk message is perceived, and in whose interests risk communication is undertaken.     

Model uncertainty and systematic risk in US banking

This paper uses Bayesian Model Averaging to examine the driving factors of equity returns of US Bank Holding Companies. BMA has as an advantage over OLS that it accounts for the considerable uncertainty about the correct set (model) of bank risk factors. We find that out of a broad set of 12 risk factors only the market, real estate, and high-minus-low Fama–French factors are reliably related to US bank stock returns over the period 1986–2010. Other factors are either only relevant over specific subperiods or for subsets of bank holding companies. We discuss the implications of our findings for empirical banking research.     

Evaluation of psychosocial and organizational factors in offshore safety: a comparative study

This study compares UK and Norwegian offshore workers' evaluations of social and organizational factors that can have an impact upon safety on offshore installations. A total of 1138 Norwegian (87% response rate) and 622 UK workers (40% response rate) responded to a self-completion questionnaire, which was distributed to 18 installations in February/March 1994. The questionnaire contained six scales that were suitable and relevant for the purposes of comparison. These scales measured ‘risk perception’, ‘satisfaction with safety measures’, ‘perceptions of the job situation’, ‘attitudes to safety’, ‘perceptions of others' commitment to safety’ and ‘perceptions of social support’. The data show clear differences in how UK and Norwegian workers evaluate various social and organizational factors that can have an impact upon safety, however, eta² analysis indicated that for most of the scales ‘installation’ explained a greater percentage of the variance than sector. The exceptions to this were scales measuring ‘safety attitudes’ where both sector and installation contributed equally to the effects. Although the results from the ‘safety attitudes’ scales should be interpreted with caution (due to low internal reliability), it is possible that they are tapping into more deeply held beliefs about the nature of safety, e.g. ‘fatalism’ and the ‘causes of accidents’. In contrast, the other scales are measuring factors directly related to the working environment such as perceptions of risk and satisfaction with safety measures on the installation. These may reflect the prevailing ‘safety climate’ or ‘atmosphere’ on the installations surveyed, whereas constructs such as ‘fatalism’, etc. may be reflections of underlying ‘cultural’ values. Recognizing the existence of different ‘safety cultures’ and understanding the processes which lie behind them could have implications for safety management in an industry which is highly international in nature and in which workers' are often required to work in foreign countries for varying periods of time.     

The time-varying asymmetry of exchange rate returns: A stochastic volatility – stochastic skewness model

While the time-varying volatility of financial returns has been extensively modelled, most existing stochastic volatility models either assume a constant degree of return shock asymmetry or impose symmetric model innovations. However, accounting for time-varying asymmetry as a measure of crash risk is important for both investors and policy makers. This paper extends a standard stochastic volatility model to allow for time-varying skewness of the return innovations. We estimate the model by extensions of traditional Markov Chain Monte Carlo (MCMC) methods for stochastic volatility models. When applying this model to the returns of four major exchange rates, skewness is found to vary substantially over time. In addition, stochastic skewness can help to improve forecasts of risk measures. Finally, the results support a potential link between carry trading and crash risk.     

Risk communication and social media during food safety crises: a study of stakeholders’ opinions in Ireland

Social media is a particular communication platform which has witnessed an exponential growth in use and influence in recent years, democratising the communication process, and offering risk communicators a way of putting into practice those principles which are advocated to be at the core of risk management and communication. However, little is known about stakeholders’ willingness to embrace this new form of communication in a food crisis. The current study presented an exploratory investigation of the opinions of Irish stakeholders on the position of risk communication in a crisis, with a particular focus on understanding what application social media may have. In-depth one-to-one interviews were carried out with key stakeholders holding frontline positions in managing and communicating about risk in the food sector in Ireland. The stakeholders identified risk communication as a central activity in a food safety crisis, driven by an obligation to protect both consumer health and the reputation of the Irish food sector. Stakeholders relied primarily on risk communication to disseminate information in a crisis so to educate and inform the public on a risk and to prevent confusion and alarmism; most did not explicitly value two-way risk communication in a crisis. The ability to effectively manage future crises may depend on stakeholders’ willingness to adapt to the changing communication landscape, namely – their willingness to adopt social media and use it effectively. The findings indicate that the stakeholders interviewed are appreciative of the need to engage with social media in times of a food safety crisis. However, most valued social media as a one-way channel to help spread a message and there was little reference to the interactive nature of this medium. Implications for integrating social media into crisis risk communication strategies are discussed.     

金融业信息安全风险及应对措施

以金融业信息安全及面临的数据大集中、网上银行、安全管理的风险为切入点,结合银行业信息安全工作的实际情况,提出可行的措施建议。