Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 28 for “"safety control"”.
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Training Safety Control Filters Using High-dimensional and Un-labeled Data
<p>Synthesizing control policies that preserve the safety of autonomous systems is a challenge that remains to be solved. Towards that goal, control barrier functions (CBFs) have been developed as mathematical constructs that can be used in real-time to correct safety-violating nominal actions to …
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Computation of safety control for hybrid system with applications to intersection collision avoidance system
… override the behavior of the driver to guarantee safety if necessary. A hybrid automaton model with hidden modes is used to solve the problem. A disturbance estimator is used to estimate the driver's reaction to the warning. Then, with the help of a mode estimator, the hybrid system with hidden …
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Design and implementation of safety control for a class of stochastic order preserving systems with application to collision avoidance near intersections
… this thesis, we have designed and implemented a safety control system for collision avoidance near intersections. We have solved the corresponding control problems for a general class of systems that also includes the scenario of the two consecutive vehicles approaching an intersection, which …
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Risk Analysis Based on Performance Criteria: A Food Safety Control System and Decision-making Tool to Control Salmonella from Whole Broilers
… powerful science-based tool that can be used to control and mitigate microbial food safety hazards. Codex recommends conducting preliminary risk management activities (PRMAs) to initiate risk analysis and to plan the risk assessment process. The information learned from these PRMAs should be …
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Using phase space attractors to evaluate system safety constraint enforcement : case study in space shuttle mission control procedure rework
… space attractors to evaluate how well STAMP safety control structures enforce system safety constraints. Phase space attractors are mathematical results that emerge from the behavior of systems with dynamic structures that draw or constrain these systems to specific regions of their phase …
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A case study of Vioxx using STAMP
… the application of a systems approach to drug safety. The recall of the prescription drug Vioxx (Rofecoxib) was used as a test case to study whether STAMP (Systems Theoretic Accident Model and Processes) could be used to outline the interactions between the different pharmaceutical system …
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Systems theoretic accident analysis of an offshore supply vessel collision
… to the accident. CAST examines a system's entire safety control structure to assess why the system constraints, control loops, and process models were either inadequate or flawed. This thesis aims at identifying how the safety control structure of the Offshore Supply Vessel operations could be …
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Destructive Behaviors in Naval Shipyards: A STAMP and System Dynamics Analysis
… RCOH events and identify the underlying safety control structure flaws that contributed to this hazardous environment. Insights from the CAST analysis were then integrated with a qualitative System Dynamics model to better understand the feedback loops and dynamic interactions driving …
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Development and Application of a Risk-Based Online Body-of-Knowledge for the U.S. Underground Coal Mining Industry: RISKGATE-US COAL
… the need for improved methods of major safety hazard identification and control. While many solutions to reducing the risk of mine disasters have been proposed, including stricter regulation and improved technology, a comprehensive risk management approach has yet to be fully integrated …
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Utilization of a scientifically operated charge-coupled device detector for high-performance thin-layer chromatographic analysis
… to facilitate pharmaceutical industrial quality control and food industrial safety control. The application of this system in these areas has shown significant improvement in sensitivity, precision, and accuracy.
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System theoretic safety analysis of the Sewol-Ho ferry accident in South Korea
… investigations performed by the Korea Maritime Safety Tribunal and the Board of Audit and Inspection of Korea, 399 people were blamed for the accident and arrested, 154 of them were put in jail, many safety policies and manuals were found inadequate, new safeguards against the kinds of accidents …
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A system theoretic approach to design safety into medical device
… of a systems approach to medical device safety in China. Professor Leveson has developed an accident modeling framework called STAMP (Systems Theoretic Accident Modeling and Processes.) Traditional accident models typically focus on component failure; in contrast, STAMP includes …
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Multiphase flow and control of fluid path in microsystems
… portability, cost, speed, reproducibility and safety. Control of fluid path in small channels between processes in a chemical/biological network is crucial for connecting process elements. We show complete separation of individual phases (phase routing) from two-phase gas-liquid and …
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Provably safe design of driver-assist systems through hybrid automata with hidden modes
… vehicles. It will allow human drivers to retain control of their vehicles while providing the guidance for drivers to apply the necessary inputs to prevent collisions before autonomous control becomes necessary. A formal approach to the design of the driver assist system is taken, employing a …
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Safety in U.S. Navy Navigation Applying STAMP Processes to Surface Ship Collisions
… U.S. Navy findings. CAST examines the system’s safety control structure to assess why the designed controls were inadequate to prevent the accident. The goal of this thesis is to determine whether a STAMP approach to accident analysis would add value to the U.S. Navy. If so, it seeks to …
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Incentive design for quality investment by smallholder producers
The food safety problem has been challenging the traditional operating model of Chinese agricultural supply chain. In the recent decades, more and more agribusinesses and cooperatives in China have adopted contract farming to strengthen food safety control during the sourcing process. Meanwhile, …
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Driving confidence and in-vehicle telematics : a study of technology adoption patterns of the 50+ driving population
… driving function through features assisting in safety and service tasks. These technologies are designed to give the operator and passengers added safety control and convenient service amenities- both of which contribute to an overall increase in piece of mind and satisfaction in the driving …
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Systems theoretic process analysis applied to Air Force acquisition technical requirements development
… both the development process and aviation safety. Such an approach was created by Professor Nancy Leveson at MIT and is called Systems Theoretic Process Analysis (STPA). STPA is shown to be applicable to the Air Force acquisitions process throughout the product lifecycle. STPA is also …
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Developing system-based leading indicators for proactive risk management in the chemical processing industry
… faced challenges with achieving improvements in safety performance, and accidents continue to occur. When accidents occur, they usually have a confluence of multiple factors, suggesting that there are underlying complex systemic problems. Moreover, accident investigations often reveal that …
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ICE-MILK: Intelligent Crowd Engineering using Machine-based Internet of Things Learning and Knowledge Building
The lack of proper crowd safety control and management often leads to spreading human casualties and infectious diseases (e.g., COVID-19). Many Machine Learning (ML) technologies inspired by computer vision and video surveillance systems have been developed for crowd counting and density estimation …
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