{"title":"A Mathematical Method to Optimize Fault Tree Displays","authors":"T. Bingham","doi":"10.56094/jss.v55i3.37","DOIUrl":"https://doi.org/10.56094/jss.v55i3.37","url":null,"abstract":"Fault Tree Analysis (FTA) has undergone significant development since its inception in the early 1960s. It has been instrumental in modeling safety and reliability problems in which failure simply is not an option. Aerospace and nuclear industries, several universities, government agencies and software developers have played a large role in the development of FTA. As a result, practical and widely applicable mathematical tools have been established using reasonably common terminology and computer applications. This paper focuses on the fault tree display itself, and on improvements that add significant benefits to it.","PeriodicalId":250838,"journal":{"name":"Journal of System Safety","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124938961","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Harnessing Uncertainty in Autonomous Vehicle Safety","authors":"Stephen Thomas, Dirk Vandenberg","doi":"10.56094/jss.v55i2.46","DOIUrl":"https://doi.org/10.56094/jss.v55i2.46","url":null,"abstract":"Safely developing self-driving vehicles presents technical challenges. Among the key technical challenges are how to confidently demonstrate the safety of a self-driving vehicle when the number of permutations of operating conditions, scenarios, system inputs, etc. are complex, uncertain and potentially limitless. This paper provides a broad survey of the various types of uncertainty in the development of self-driving vehicles and outlines several possible strategies for handling uncertainty. Advantages and challenges of different approaches, including qualitative and quantitative methods, are also discussed.","PeriodicalId":250838,"journal":{"name":"Journal of System Safety","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128459296","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"From the Editor's Desk","authors":"Charles Muniak","doi":"10.56094/jss.v55i2.41","DOIUrl":"https://doi.org/10.56094/jss.v55i2.41","url":null,"abstract":"Ludwig Benner’s letter to the editor in this issue of Journal of System Safety asks the question of whether there have been “definitive vulnerability assessments of the predictive system safety analysis tools, like HAZOPS, PHA, FEMA and PSSA.” It’s a good question.","PeriodicalId":250838,"journal":{"name":"Journal of System Safety","volume":"54 32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124533419","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Improving the Standard Risk Matrix using STPA","authors":"N. Leveson","doi":"10.56094/jss.v55i2.44","DOIUrl":"https://doi.org/10.56094/jss.v55i2.44","url":null,"abstract":"This paper first discusses the limitations of the standard risk matrix. It then suggests some changes to the risk matrix and its use to improve the accuracy of the results.","PeriodicalId":250838,"journal":{"name":"Journal of System Safety","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130410709","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Welcome to the 37th ISSC!","authors":"Charles Muniak","doi":"10.56094/jss.v55i2.47","DOIUrl":"https://doi.org/10.56094/jss.v55i2.47","url":null,"abstract":"Highlights from the 2019 International System Safety Conference","PeriodicalId":250838,"journal":{"name":"Journal of System Safety","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130677304","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"System Safety in Healthcare","authors":"D. Raheja, M. Escano","doi":"10.56094/jss.v55i2.42","DOIUrl":"https://doi.org/10.56094/jss.v55i2.42","url":null,"abstract":"The field of telemedicine has transformed over the years. Its use has expanded beyond the care of patients in remote and rural areas to its many other current applications. It has allowed access to specialists who are not available otherwise. The telemedicine platform has expanded, and its impact is growing in the ever-evolving health care environment.","PeriodicalId":250838,"journal":{"name":"Journal of System Safety","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122112803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Model-Based Systems Engineering for System Safety: An Introduction","authors":"P. Oliver","doi":"10.56094/jss.v55i2.45","DOIUrl":"https://doi.org/10.56094/jss.v55i2.45","url":null,"abstract":"Model-based systems engineering (MBSE) has gained momentum as the predominant method of analyzing and deriving system requirements, as well as of verifying and validating system performance. Over the years, several frameworks have gained prominence as approved methods and formal techniques to model systems. MBSE technology continues to gain popularity within the systems engineering domain, especially in markets of complex systems. To remain relevant within the context of concurrent engineering, it is advantageous for system safety engineers to learn how these techniques are affecting system design so that safety is addressed within system development. This paper provides an overview of MBSE in theory and practice, and provides high-level details on how the system safety engineer can use these methods for optimum impact in affecting safety design.","PeriodicalId":250838,"journal":{"name":"Journal of System Safety","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127231327","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"TBD","authors":"C. Hoes, Lee Flint","doi":"10.56094/jss.v55i1.52","DOIUrl":"https://doi.org/10.56094/jss.v55i1.52","url":null,"abstract":"Lately, I have been wondering about the apparent decrease in interest in the International System Safety Society (ISSS), judging by the sharp decrease in membership and conference attendance during the past decade or so. Fairly obviously, the government’s sequester policy had a lot to do with the decrease, starting around 2008. However, while the overall economy has slowly recovered and government budgets are largely restored, our membership has remained flat or has slowly declined from year to year.","PeriodicalId":250838,"journal":{"name":"Journal of System Safety","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129453139","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Design-Based Safety","authors":"D. maccollum","doi":"10.56094/jss.v55i1.50","DOIUrl":"https://doi.org/10.56094/jss.v55i1.50","url":null,"abstract":"Outside our professional fraternity of system safety practitioners, I am amazed at the “hocus-pocus” image of what system safety is. In lay terms, system safety needs to be explained as a learning process to identify unrecognized hazards at time of design.","PeriodicalId":250838,"journal":{"name":"Journal of System Safety","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132705747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Cost, Schedule and Safety Benefits of Early System Safety Involvement","authors":"J. Hewitt, D. Foito","doi":"10.56094/jss.v55i1.56","DOIUrl":"https://doi.org/10.56094/jss.v55i1.56","url":null,"abstract":"System safety engineering is the application of engineering and management principles, criteria and techniques to achieve acceptable mishap risks. System safety typically reduces mishap risks through analyses that identify and address potential system failure modes. Studies indicate that when system safety is involved early in the product lifecycle, schedule slippage and cost escalation resulting from design changes can be substantially reduced. Development programs often face the dilemma of whether to apply funding to perform thorough, intensive system safety analyses in the conceptual design phase or wait until later, when designs are more complete, parts are being manufactured or testing is underway. Performing the analyses earlier consumes funds that might be needed later, while performing the analyses later increases the likelihood of expensive and time-consuming redesigns. This paper provides examples that encourage involving system safety engineering earlier in the process, by demonstrating the cost and schedule advantages, as well as the expected safety risk reduction. In addition, involving system safety earlier permits corrective actions to be implemented at a higher level in the system safety order of design precedence, which increases the effectiveness of corrective actions and reduces residual risk.","PeriodicalId":250838,"journal":{"name":"Journal of System Safety","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126008800","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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