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Progress and Problems of Japanese Chemistry and Chemical Industry
( Akio Yamamoto ) 한국공업화학회 2002 한국공업화학회 연구논문 초록집 Vol.2002 No.0
1. Brief historical description of the recent development of science and manufacturing industry in Japan.2. School systems.3. Science policy in Japan, if any. 4. Increase in the number of students in science and technology. 5. Comparison of research environments in the US and in Japan.6. Economic success and bursting of the economic bubble. Effect of recent economic recession. 7. Enactment of the fundamental law for promotion of science and technology in 1995. 8. Boosting of the national support for fundamental research in universities since 1996 and its influences.9. Examples of the support in Japan Science and Technology Agency (CREST program) and its results. 10. Remaining problems. 11. Future prospects
Akio Yamamoto,Akinori Giho,TOMOHIRO ENDO 한국원자력학회 2017 Nuclear Engineering and Technology Vol.49 No.6
This paper describes recent development activities of the GENESIS code, which is a transport code for heterogeneous three-dimensional geometry, focusing on applications to reactor core analysis. For the treatment of anisotropic scattering, the concept of the simplified Pn method is introduced in order to reduce storage of flux moments. The accuracy of the present method is verified through a benchmark problem. Next, the iteration stability of the GENESIS code for the highly voided condition, which would appear in a severe accident (e.g., design extension) conditions, is discussed. The efficiencies of the coarse mesh finite difference and generalized coarse mesh rebalance acceleration methods are verified with various stabilization techniques. Use of the effective diffusion coefficient and the artificial grid diffusion coefficients are found to be effective to stabilize the acceleration calculation in highly voided conditions.
AEGIS: AN ADVANCED LATTICE PHYSICS CODE FOR LIGHTWATER REACTOR ANALYSES
AKIO YAMAMOTO,TOMOHIRO ENDO,MASATO TABUCHI,NAOKI SUGIMURA,TADASHI USHIO,MASAAKI MORI,MASAHIRO TATSUMI,YASUNORI OHOKA 한국원자력학회 2010 Nuclear Engineering and Technology Vol.42 No.5
AEGIS is a lattice physics code incorporating the latest advances in lattice physics computation, innovative calculationmodels and efficient numerical algorithms and is mainly used for light water reactor analyses. Though the primary objectiveof the AEGIS code is the preparation of a cross section set for SCOPE2 that is a three-dimensional pin-by-pin core analysiscode, the AEGIS code can handle not only a fuel assembly but also multi-assemblies and a whole core geometry in two-dimensional geometry. The present paper summarizes the major calculation models and part of the verification/validationefforts related to the AEGIS code.
AEGIS: AN ADVANCED LATTICE PHYSICS CODE FOR LIGHT WATER REACTOR ANALYSES
Yamamoto, Akio,Endo, Tomohiro,Tabuchi, Masato,Sugimura, Naoki,Ushio, Tadashi,Mori, Masaaki,Tatsumi, Masahiro,Ohoka, Yasunori Korean Nuclear Society 2010 Nuclear Engineering and Technology Vol.42 No.5
AEGIS is a lattice physics code incorporating the latest advances in lattice physics computation, innovative calculation models and efficient numerical algorithms and is mainly used for light water reactor analyses. Though the primary objective of the AEGIS code is the preparation of a cross section set for SCOPE2 that is a three-dimensional pin-by-pin core analysis code, the AEGIS code can handle not only a fuel assembly but also multi-assemblies and a whole core geometry in two-dimensional geometry. The present paper summarizes the major calculation models and part of the verification/validation efforts related to the AEGIS code.
Dielectric oil-based polymer actuator for improved thickness strain and breakdown voltage
Minsung Cho,Akio Yamamoto 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.9
Dielectric elastomer actuators (DEAs) have been increasingly investigated as alternative actuators to conventional ones. However, DEAs suffer from high rates of premature failure. Therefore, this study proposes a dielectric oil-based polymer actuator, also called a Dielectric liquid actuator (DLA), to compensate for the drawbacks of DEAs. DLA was experimentally compared with conventional DEAs. Results showed that DLA successfully prevented thermal runaway at defects in the electrode and excessive thinning of the film, resulting in increased breakdown voltage. Consequently, premature failure was inhibited, and the performance was improved. The breakdown voltages of DLA and DEA were 6000 and 2000 V, respectively, and their maximum thickness strains were 49.5% and 37.5%, respectively.
( Kei Saito ),( Yousuke Nakai ),( Hiroyuki Isayama ),( Ryuichi Yamamoto ),( Kazumichi Kawakubo ),( Yuzo Kodama ),( Akio Katanuma ),( Atsushi Kanno ),( Masahiro Itonaga ),( Kazuhiko Koike ) 대한소화기학회 2021 Gut and Liver Vol.15 No.1
Background/Aims: The aim of this study was to evaluate the safety and efficacy of partially covered self-expandable metallic stents (PCSEMS) in patients undergoing neoadjuvant chemo (radio) therapy (NAC) for pancreatic cancer (PC). Methods: This was a prospective multicenter study to evaluate the safety and efficacy of PC-SEMS in patients receiving NAC for resectable and borderline resectable PC. The primary endpoint was the rate of recurrent biliary obstruction (RBO). Results: Twenty-six patients with PC (three with resectable PC and 23 with borderline resectable PC) who underwent NAC at seven Japanese centers were included in the analysis. Both the technical and functional success rates of PCSEMS placement were 100%. Early stent-related complications were observed in three patients (11.5%): mild pancreatitis (n=2) and mild liver abscess (n=1). The median time to surgery or palliation was 4.0 months. Surgical resection was eventually performed in 73.1% of patients, and stent removal during surgery was successful in all patients. RBO was observed in nine patients (34.6%): seven with stent occlusion, one with kinking and one with migration. The RBO rates in resected cases and nonresected cases were 36.8% and 28.6%, respectively. Conclusions: Biliary drainage by PCSEMS was safe and feasible in patients undergoing NAC for resectable and borderline resectable PC. (Gut Liver 2021;15:135-141)
포스핀류가 배위된 팔라듐 착물에 의한 불포화카르복실산의 카르보닐화고리 반응 (제 1 보). 불포화카르복실산이 배위된 팔라듐(0, Ⅱ) 착물의 합성과 구조
Myung-Ki Doh,Maeng-Jun Jung,Dong-Jin Lee,Kohtaro Osakada,Akio Yamamoto 대한화학회 1993 대한화학회지 Vol.37 No.4
$trans-PdEt_2(PMe_3)_2$와 styrene을 반응시켜 얻어진 $Pd(PMe_3)_2$(styrene)에 methacrylic acid와 trans-crotonic acid를 각각 반응시켜 새로운 팔라듐(O)-올레핀착물로서 $(PMe_3)_2Pd{CH_2=C(CH_3)COOH}$와 (PMe_3)_2Pd{(CH_3)CH=CHCOOH}$를 합성하고, 구조와 특성을 원소분석, IR 및 $^1H-,\;^{13}C-,\;^{31}P-NMR$ 등의 분광학적 방법으로 조사하였다. methacrylic acid 와 trans-crotonic acid에 존재하는 올레핀의 이중결합은 팔라듐(O)에 ${\pi}$-결합을 형성하였고, 카르복실산은 팔라듐에 결합되지 않았음을 알게되었다. 그리고 동일한 반응에서 metallacycle을 형성하는 3-butenoic acid와 비교 검토하였다. New Palladium(0)-olefin complexes, $(PMe_3)_2Pd{CH_2=C(CH_3)COOH} \;and\;(PMe_3)_2Pd{(CH_3)CH=CHCOOH}$ have been prepared by treating $Pd(PMe_3)_2$(styrene) with methacrylic acid and trans-crotonic acid, respectively. These complexes were characterized by elemental analysis, IR and $^1H-,\;^{13}C-,\;and\;^{31}P$-NMR spectroscopy. The carboxylic acid entity was found non-bonded with palladium while ${\pi}$-bond is formed between the olefin double bond and Pd(0). The results are compared with the metallacycle formation the reaction of Pd(PMe3)2(styrene) with 3-butenoic acid.