The Experts below are selected from a list of 251790 Experts worldwide ranked by ideXlab platform
Helen H. Lou - One of the best experts on this subject based on the ideXlab platform.
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Large-scale dynamic simulation for Security assessment of an ethylene oxide manufacturing Process
Computers & Chemical Engineering, 2006Co-Authors: Helen H. Lou, Jayachandran Chandrasekaran, Rebecca A. SmithAbstract:Abstract Safety is the second nature of chemical Processes. Process Security is the extended concept and practice of Process safety. In large-scale chemical manufacturing, unit operations interact closely through various mass, energy, and momentum transfers. This may cause many possible occurrences of “chain-reaction” type disasters, which should be rooted out completely. To ensure Process Security and safety, the first step is the accurate assessment of Security status of the Processes. In this paper, a Security-bearing, large-scale Process dynamic modeling and simulation method is utilized to perform Security assessment of an ethylene oxide production Process involving various units, including a multi-tubular plug flow reactor operated under high pressure and temperature, adsorption and separation units, heat exchangers, recycle stream, and purge stream. The chemicals involved in this Process possess serious environmental and health hazards. By simulating Process behavior under various scenarios, this method can be used to classify the operational space, assess Process Security status quantitatively, foresee possible Security failures, and give a critical review of design and operation policy to secure operation.
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An Improved γ-Analysis Method for Process Security Analysis
Process Safety and Environmental Protection, 2006Co-Authors: Korkut Uygun, Yinlun Huang, Helen H. LouAbstract:Process Security is a newly pronounced issue facing the chemical Process industry in the post 11 September era. Traditional safety is no longer sufficient for a chemical plant; it must also be secure . However, systematic and effective quantitative methodologies for Process Security analysis are necessary. To address this issue, the γ-analysis method was introduced very recently by Uygun et al . (2003) as a Process Security analysis framework. By that method, a Process Security problem need be formulated as a minimum-time (to reach disaster) control problem. The method combines Pontryagin's minimum principle (with some modifications) with a discretization scheme to transform the Security problem from a single dynamic-optimization problem to multiple static optimization problems, hence solving the Process Security problem without extensive system simulations. In this work, an improved γ-analysis method is introduced, which is featured by its first-order approximation to the time derivative function of a system model, as compared to the zero-order approximation during model discretization in the original implementation. This improvement can significantly reduce the number of optimization problems needed, thereby reducing computational requirements in on-line application. A reaction runaway example is studied to demonstrate the efficacy of the improved method, demonstrating that a 10-fold reduction in computational load can be achieved.
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Process Security IN CHEMICAL ENGINEERING EDUCATION
Chemical engineering education, 2005Co-Authors: Cristina Piluso, Korkut Uygun, Yinlun Huang, Helen H. LouAbstract:The threats of terrorism have greatly alerted the chemical Process industries to assure plant Security at all levels: infrastructure-improvement-focused physical Security, information-protection-focused cyber Security, and design-and-operation-improvement-focused Process Security. While developing effective plant Security methods and technologies is urgent for the industries, identifying and integrating plant Security elements into undergraduate curriculum is vital for a new generation of engineers. This paper discusses the necessity and explores opportunities of integrating Process Security concepts into undergraduate curriculum, mainly through Process Design and Process Safety courses. An educational tool to assist in this effort is also presented, along with a sample case study to be utilized in classroom teaching.
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Fast Process Security assessment theory
AIChE Journal, 2004Co-Authors: Korkut Uygun, Yinlun Huang, Helen H. LouAbstract:This communication introduces a comprehensive theory for Process Security assessment. The theory can quickly provide mathematically proven upper and lower bounds on minimum time to disaster (the time disaster conditions will be reached in worst-case scenarios). Computational efficiency and reliability are achieved by performing Process Security assessment based on a time-derivative– based approach, rather than conducting massive Process dynamic simulations. Further, the methodology enables prioritizing the Process variables critical to plant Security. This facilitates pinpointing the possible reasons of a Security-threatening situation, quantifying the importance of each disturbance factor on the system’s vulnerability, and creating a prioritized list of improvements/ counteractions for ensuring Process Security. Two runaway reactor examples are studied to demonstrate the methodology for Security-threat analysis. © 2004 American Institute of Chemical Engineers AIChE J, 50: 2187–2202, 2004
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Process Security ASSESSMENT: OPERATIONAL SPACE CLASSIFICATION AND Process Security INDEX
Process Safety and Environmental Protection, 2003Co-Authors: Helen H. Lou, Rameshkumar Muthusamy, Yinlun HuangAbstract:Many chemical Processes can be operationally risky, environmentally harmful and potentially dangerous when abnormal or destructive situations occur. This is due to the fact that chemical Processes are often operated under high pressures, at high temperatures, and with fast material flows and complex manufacturing mechanisms. In the extreme, catastrophes such as explosions, toxic release and loss of life will occur unexpectedly and rapidly, particularly when a terrorist who has a sufficient technical background in chemical operations attacks a plant. To assure Process Security, systematic and effective Process Security-bearing operational strategies must be developed. This paper introduces a Process operational space classification method and a Process operational Security index. The method and the index can be an effective quantitative tool for characterizing and analysing Process Security, especially when the Process experiences various disturbances set by saboteurs who may be technically very knowledgeable. The efficacy of the quantification method is demonstrated by its application to an exothermic batch reactor.
Vibhu Saujanya Sharma - One of the best experts on this subject based on the ideXlab platform.
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Cloud Computing Security--Trends and Research Directions
2011 IEEE World Congress on Services, 2011Co-Authors: Shubhashis Sengupta, Vikrant Kaulgud, Vibhu Saujanya SharmaAbstract:Cloud Computing is increasingly becoming popular as many enterprise applications and data are moving into cloud platforms. However, a major barrier for cloud adoption is real and perceived lack of Security. In this paper, we take a holistic view of cloud computing Security - spanning across the possible issues and vulnerabilities connected with virtualization infrastructure, software platform, identity management and access control, data integrity, confidentiality and privacy, physical and Process Security aspects, and legal compliance in cloud. We present our findings from the points of view of a cloud service provider, cloud consumer, and third-party authorities such as Govt. We also discuss important research directions in cloud Security in areas such as Trusted Computing, Information Centric Security and Privacy Preserving Models. Finally, we sketch a set of steps that can be used, at a high level, to assess Security preparedness for a business application to be migrated to cloud.
Korkut Uygun - One of the best experts on this subject based on the ideXlab platform.
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An Improved γ-Analysis Method for Process Security Analysis
Process Safety and Environmental Protection, 2006Co-Authors: Korkut Uygun, Yinlun Huang, Helen H. LouAbstract:Process Security is a newly pronounced issue facing the chemical Process industry in the post 11 September era. Traditional safety is no longer sufficient for a chemical plant; it must also be secure . However, systematic and effective quantitative methodologies for Process Security analysis are necessary. To address this issue, the γ-analysis method was introduced very recently by Uygun et al . (2003) as a Process Security analysis framework. By that method, a Process Security problem need be formulated as a minimum-time (to reach disaster) control problem. The method combines Pontryagin's minimum principle (with some modifications) with a discretization scheme to transform the Security problem from a single dynamic-optimization problem to multiple static optimization problems, hence solving the Process Security problem without extensive system simulations. In this work, an improved γ-analysis method is introduced, which is featured by its first-order approximation to the time derivative function of a system model, as compared to the zero-order approximation during model discretization in the original implementation. This improvement can significantly reduce the number of optimization problems needed, thereby reducing computational requirements in on-line application. A reaction runaway example is studied to demonstrate the efficacy of the improved method, demonstrating that a 10-fold reduction in computational load can be achieved.
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Process Security IN CHEMICAL ENGINEERING EDUCATION
Chemical engineering education, 2005Co-Authors: Cristina Piluso, Korkut Uygun, Yinlun Huang, Helen H. LouAbstract:The threats of terrorism have greatly alerted the chemical Process industries to assure plant Security at all levels: infrastructure-improvement-focused physical Security, information-protection-focused cyber Security, and design-and-operation-improvement-focused Process Security. While developing effective plant Security methods and technologies is urgent for the industries, identifying and integrating plant Security elements into undergraduate curriculum is vital for a new generation of engineers. This paper discusses the necessity and explores opportunities of integrating Process Security concepts into undergraduate curriculum, mainly through Process Design and Process Safety courses. An educational tool to assist in this effort is also presented, along with a sample case study to be utilized in classroom teaching.
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Fast Process Security assessment theory
AIChE Journal, 2004Co-Authors: Korkut Uygun, Yinlun Huang, Helen H. LouAbstract:This communication introduces a comprehensive theory for Process Security assessment. The theory can quickly provide mathematically proven upper and lower bounds on minimum time to disaster (the time disaster conditions will be reached in worst-case scenarios). Computational efficiency and reliability are achieved by performing Process Security assessment based on a time-derivative– based approach, rather than conducting massive Process dynamic simulations. Further, the methodology enables prioritizing the Process variables critical to plant Security. This facilitates pinpointing the possible reasons of a Security-threatening situation, quantifying the importance of each disturbance factor on the system’s vulnerability, and creating a prioritized list of improvements/ counteractions for ensuring Process Security. Two runaway reactor examples are studied to demonstrate the methodology for Security-threat analysis. © 2004 American Institute of Chemical Engineers AIChE J, 50: 2187–2202, 2004
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Process Security analysis: γ‐Analysis and σ‐map
AIChE Journal, 2003Co-Authors: Korkut Uygun, Yinlun Huang, Helen H. LouAbstract:This work has introduced a number of tools and decision criteria for Process-Security analysis. As demonstrated in the case study (nonisothermal CSTR), these tools can be used in tandem to identify possible Process-Security problems, to analyze correlations between critical Process inputs and Security-sensitive outputs, and to find the principal factors leading to the Security-threatening possibilities. γ-Analysis, consituted of the Security theorem and first three definitions, presents a method for quickly evaluating Process Security for any given system. The Σ-maps are a visual tool to analyze the system and to deduce additional information about the Process and its likely exposure to Security threats, as exemplified in the case study.
Shubhashis Sengupta - One of the best experts on this subject based on the ideXlab platform.
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Cloud Computing Security--Trends and Research Directions
2011 IEEE World Congress on Services, 2011Co-Authors: Shubhashis Sengupta, Vikrant Kaulgud, Vibhu Saujanya SharmaAbstract:Cloud Computing is increasingly becoming popular as many enterprise applications and data are moving into cloud platforms. However, a major barrier for cloud adoption is real and perceived lack of Security. In this paper, we take a holistic view of cloud computing Security - spanning across the possible issues and vulnerabilities connected with virtualization infrastructure, software platform, identity management and access control, data integrity, confidentiality and privacy, physical and Process Security aspects, and legal compliance in cloud. We present our findings from the points of view of a cloud service provider, cloud consumer, and third-party authorities such as Govt. We also discuss important research directions in cloud Security in areas such as Trusted Computing, Information Centric Security and Privacy Preserving Models. Finally, we sketch a set of steps that can be used, at a high level, to assess Security preparedness for a business application to be migrated to cloud.
Vikrant Kaulgud - One of the best experts on this subject based on the ideXlab platform.
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Cloud Computing Security--Trends and Research Directions
2011 IEEE World Congress on Services, 2011Co-Authors: Shubhashis Sengupta, Vikrant Kaulgud, Vibhu Saujanya SharmaAbstract:Cloud Computing is increasingly becoming popular as many enterprise applications and data are moving into cloud platforms. However, a major barrier for cloud adoption is real and perceived lack of Security. In this paper, we take a holistic view of cloud computing Security - spanning across the possible issues and vulnerabilities connected with virtualization infrastructure, software platform, identity management and access control, data integrity, confidentiality and privacy, physical and Process Security aspects, and legal compliance in cloud. We present our findings from the points of view of a cloud service provider, cloud consumer, and third-party authorities such as Govt. We also discuss important research directions in cloud Security in areas such as Trusted Computing, Information Centric Security and Privacy Preserving Models. Finally, we sketch a set of steps that can be used, at a high level, to assess Security preparedness for a business application to be migrated to cloud.