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JOHN M. O’HARA,JAMES C. HIGGINS,WILLIAM S. BROWN 한국원자력학회 2009 Nuclear Engineering and Technology Vol.41 No.3
This study has identified human performance research issues associated with the implementation of new technology in nuclear power plants (NPPs). To identify the research issues, current industry developments and trends were evaluated in the areas of reactor technology, instrumentation and control technology, human-system integration technology, and human factors engineering (HFE) methods and tools. The issues were prioritized into four categories based on evaluations provided by 14 independent subject matter experts representing vendors, utilities, research organizations and regulators. Twenty issues were categorized into the top priority category. The study also identifies the priority of each issue and the rationale for those in the top priority category. The top priority issues were then organized into research program areas of: New Concepts of Operation using Multi-agent Teams, Human-system Interface Design, Complexity Issues in Advanced Systems, Operating Experience of New and Modernized Plants, and HFE Methods and Tools. The results can serve as input to the development of a long-term strategy and plan for addressing human performance in these areas to support the safe operation of new NPPs.
O'Hara, P.,Duarte, C.A.,Eason, T. Techno-Press 2010 Interaction and multiscale mechanics Vol.3 No.3
This paper investigates the heat equation for domains subjected to an internal source with a sharp spatial gradient. The solution is first approximated using linear finite elements, and sufficiently small time-step sizes to yield stable simulations. The main area of interest is then in the ability to approximate the solution using Generalized Finite Elements, and again explore the time-step limitations required for stable simulations. Both high order elements, as well as elements with special enrichments are used to generate solutions. When compared to linear finite elements, the high order elements deliver better accuracy at a given level of mesh refinement, but do not offer an increase in critical time-step size. When special enrichment functions are used, the solution can be approximated accurately on very coarse meshes, while yielding solutions which are both accurate and computationally efficient. The major conclusion of interest is that the significantly larger element size yields larger allowable time-step sizes while still maintaining stability of the time-stepping algorithm.
O'Hara, John M.,Higgins, James C.,Brown, William S. Korean Nuclear Society 2009 Nuclear Engineering and Technology Vol.41 No.3
This study has identified human performance research issues associated with the implementation of new technology in nuclear power plants (NPPs). To identify the research issues, current industry developments and trends were evaluated in the areas of reactor technology, instrumentation and control technology, human-system integration technology, and human factors engineering (HFE) methods and tools. The issues were prioritized into four categories based on evaluations provided by 14 independent subject matter experts representing vendors, utilities, research organizations and regulators. Twenty issues were categorized into the top priority category. The study also identifies the priority of each issue and the rationale for those in the top priority category. The top priority issues were then organized into research program areas of: New Concepts of Operation using Multi-agent Teams, Human-system Interface Design, Complexity Issues in Advanced Systems, Operating Experience of New and Modernized Plants, and HFE Methods and Tools. The results can serve as input to the development of a long-term strategy and plan for addressing human performance in these areas to support the safe operation of new NPPs.
Bahk, S. Y.,Chang, S. D.,Cheon, B. G.,Cho, J. H.,Jang, H. I.,Hahn, C. H.,Hara, T.,Lim, G. Y.,Kang, J. S.,Kim, C. O.,Kim, J. Y.,Kim, K. Y.,Kim, S. N.,Kim, T. I.,Kim, T. Y.,Koo, D. G.,Lee, S. B.,Lim, I. 慶尙大學校 기초과학연구소 1991 基礎科學硏究所報 Vol.7 No.-
An angular method of identifying diffractive excitation(DE) events for interactions of a hadron beam in nuclear emulsion is applied to identifying DE events in interactions of heavy ions beams. The "apparent" mean free paths (MEP) of DE processes for ^16O(^28Si) beams are 1.00±0.12, 2.4^_1.6_-0.7, and 2.2±0.4(1.5±0.2)m, respectively, at 200, 60 and 14.6 GeV/nucleon, which corresponds to 20-10% fo the MFP for total inelastic interactions. Distinctive features of diffractively excited nuclei are discussed.
Direct Observation of Sequential Weak Decay of a Double Hypernucleus
AOKI, S.,BAHK, S. Y.,CHUNG, K. S.,CHUNG, S. H.,FUNAHASHI, H.,HAHN, C. H.,HARA, T.,HIRATA, S.,HOSHINO, K.,IEIRI, M.,IIJIMA, T.,IMAI, K.,ISHIGAMI, T.,ITOW, Y.,KAZUNO, M.,KIKUCHI, K.,KIM, C. O.,KIM, D. C 國立昌原大學校 基礎科學硏究所 1992 基礎科學硏究所論文集 Vol.3 No.-
We have studied stars in nuclear emulsion due to the capture at rest of the ??? hyperons produced in the(???) reaction. The sequential weak decay of a double hypernucleus(nucleus with S= -2) has been directly observed. The double hypernucleus is assigned as either ???? or ????. This assignment excludes the existence of the H dibaryon lighter than 2203.7±0.7 MeV/c².
Evidence of Weak Decay of Heavy Double Hypernuclei
Aoki, S.,Bahk, S. Y.,Chung, K. S.,Chung, S. H.,Funahashi, H.,Hahn, C. H.,Hara, T.,Hirata, S.,Hoshino, K.,Ieiri, M.,Iijima, T.,Imai, K.,Ishigami, T.,Itow, Y.,Kazuno, M.,Kikuchi, K.,Kim, C. O.,Kim, D. C 國立昌原大學校 基礎科學硏究所 1992 基礎科學硏究所論文集 Vol.3 No.-
We have studied 80 events of candidates for ??? capture star at rest in nuclear emulsion, where ??? hyperons are produced in (??????) reactions identified by a ?? spectrometer. The weak decay of heavy double hypernuclei is confirmed, studying the distribution of visible energy-release and the probability of emission of two fast protons, in comparison with those for single hypernuclei.
Search for the H Dibaryon in (K-, K+) Reactions
Bahk,S. Y.,Chung,K. S,Chung,S. H.,Funahashi,H.,Hahn,C. H.,Hara,T.,Hirata,S.,Hoshino,K.,Ieiri,M.,Iijima,T.,Imai,K.,Ishigami,T.,Itow,Y.,Kazuno,M.,Kikuchi,K.,Kim,C. O.,Kim,D. C.,Kim,J. Y.,Kobayashi,M.,Ko 國立昌原大學校 基礎科學硏究所 1992 基礎科學硏究所論文集 Vol.3 No.-
We have studied(??) reactions from an emulsion target. The S--2H dibaryon has been searched for by the analysis of the ??? momentum spectrum together with emulsion data. No evidence of H production was observed in the mass range of 1.90-2.16 GeV/c². Upper limits for the production cross section of the H are (0.2-0.6)% of that for the quasifree ??? production at the 90% confidence level.