Keynote Speakers 1

 Gregory Levitin


Israel Electric Corporation Limited

Haifa, Israel

TitleOptimization of mission abort policies

AbstractAt many instances it is important to keep a system from being destroyed or lost at a cost of not completing its mission. Therefore, to enhance survivability of critical systems performing missions associated with high risks (e.g., aircrafts and human space flight systems), continuation of the system primary task can be aborted and a rescue procedure can be initiated. The ambient conditions during performing the primary task and the rescue procedure can differ. For aborting a mission, some degradation parameter should be observed that characterizes the current state of a system. For instance, this parameter can be a number of elements failed during a mission in a standby system or a number external impacts experienced by a system. The optimal abort policy (mission abort decision rule) should balance a tradeoff either between the mission success probability and system survivability or between the expected monetary losses associated with the uncompleted mission and with the system failure. In this talk analysis and optimization of different optimal static and dynamic mission abort policies will be presented. The optimal system loading during the primary mission and the rescue procedure will also be discussed.

Bio: Prof. Gregory Levitin is presently a senior expert at the Reliability Department of the Israel Electric Corporation and distinguished visiting professor at University of Electronic Science and Technology of China. His current interests are in system reliability and defense. In this field Prof. Levitin has published more than 280 papers and four books. He is senior member of IEEE and chair of the ESRA Technical Committee on System Reliability.  From 2009 to 2016 he served as associate editor of IEEE Transactions on Reliability, area coordinator of International Journal of Performability Engineering. Now he serves as editor of Reliability Engineering & System Safety and member of editorial boards of Journal of Risk and Reliability and Reliability and Quality Performance.
Keynote Speakers 2

Dong Ho Bae


Sungkyunkwan University 

Seoul, Korea

Abstract:The most currently, reducing environmental pollution is being raised important issue in thermal power-plant system. The most effective methodology is improving efficient of steam turbine. To improve the performance, increasing operating temperature of system above 700℃is good way to solve. Then it is necessary to develop suitable materials in this extreme condition. Among the materials developed so far, Ni-based super alloys have been good candidates due to their excellent properties such as creep strength, corrosion resistance, heat resistance, and oxidation resistance. However, in order to apply these Ni-based alloys to the steam turbine, it is necessary to develop the welding technology for similar and dissimilar materials, welding residual stress analysis, post-weld heat treatment technology and mechanical property tests under real operating conditions. In low pressure and temperature stage of steam turbine, damages of the rotors and blades are mainly caused by corrosion and corrosion fatigue. Therefore 12Cr steel is also desirable replacement for its corrosion resistance property and in terms of economical prime cost.

In this presentation, following subjects will be introduced; 1. Dissimilar material welding technology between super-Alloy 617 and 12Cr steel, 2. A numerical welding residual stress analysis method simulated actual welding process, and 3. Corrosion fatigue life prediction and reliability assessment based on probability distribution function.

Bio: Dr. Dong Ho Bae received Ph.D in Mechanical Engineering from Nihon University, Tokyo, Japan. He is a senior professor at the School of Mechanical Engineering in Sungkyunkwan University, Korea. His current interests include welding design, micro-joining & welding, environmental strength & fracture mechanics, and life prediction & reliability assessment.  He has published more than 100 papers those are indexed in SCI. He served as a president of reliability division of the Korean Society of Mechanical Engineers (KSME), general chairman of ICMR2011, 2015, and co-chairman of QR2MSE & ICMR 2013, 2017. He has received excellent paper and academic achievement awards from the KSME. He currently serves as a committee member of Institute of Korean Industrial and Technology Assessment.