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이토코지 ( Ito Koji ) 고려대학교 민족문화연구원 2017 民族文化硏究 Vol.77 No.-
본 연구는 1980년대 이후 일본사학계에서 동아시아 교류사의 연구 동향을 살펴보고자 한 것으로서, 특별히 연구 성과가 축적된 중세(中世)의 동아시아 교류사에 관해 중점적으로 논한 것이다. 고찰의 결과, 일본 근래의 동아시아 교류사 연구는 “국가”를 상대화하는 환중국해 지역이나 현해탄 지역 등의 “지역”을 설정함으로써, 국경을 넘어 활동하는 사람들의 모습을 잇달아 밝히는 등 풍부한 성과를 거두었다. 그러나 반면에, 그러한 성과가 어떻게 일본 국내의 정치·사회 상황과 연결되고, 영향을 주었는지에 대한 부분에 대해서는 과제를 남기고 있다고 하겠다. The purpose of this study is to examine the research trends of East Asian exchanges in the Japanese history since the 1980s, focusing especially on the medieval East Asian exchanges in which research results have accumulated. As a result of the study, the study of East Asian exchanges in recent years has achieved rich outcomes such as identifying the people who crossed the border by establishing "regions" such as the South China Sea region and the Tsushima Strait area. On the other hand, however, this study is leaving a question about how such achievements are linked to and influenced the political and social situation in Japan.
Role of Interfacial B Impurity in the Magnetocrystalline Anisotropy at MgO/Fe Interface
Koji Hotta,Kohji Nakamura,Toru Akiyama,Tomonori Ito 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
The structural stability and the magnetocrystalline anisotropy (MCA) at MgO/Fe(001) interfaceswith the incorporation of interfacial B atoms were investigated by using first-principles calculations. Total energy calculations predicted that the B atoms favored segregating to the interface. Thecalculated MCA energy for an ideal abrupt MgO/Fe interface (with no B atom) indicated that themagnetization strongly favored pointing along the perpendicular direction. However, when B atomswere incorporated at the MgO/Fe interfaces, the perpendicular MCA almost disappeared.
Ito Ken,Okano Naoki,Takuma Kensuke,Iwasaki Susumu,Watanabe Koji,Kimura Yusuke,Yamada Yuto,Yoshimoto Kensuke,Hara Seiichi,Kishimoto Yui,Matsuda Takahisa,Igarashi Yoshinori 거트앤리버 소화기연관학회협의회 2023 Gut and Liver Vol.17 No.4
Background/Aims: Many Japanese institutions use electromagnetic extracorporeal shock wave lithotripsy (ESWL) systems for treating pancreatic duct stones. However, there are no reports on direct comparisons between recent electromagnetic lithotripters. This study aimed to verify whether the new electromagnetic lithotripter can improve the efficiency of pancreatic stone fragmentation, and to clarify the role of combined endoscopic treatment on the clearance of pancreatic duct stones. Methods: We retrospectively identified 208 patients with pancreatolithiasis who underwent endoscopic adjunctive treatment after pancreatic ESWL at a single Japanese center over a 17-year period. We evaluated the outcome data of this procedure performed with SLX-F2 (last 2 years; group A) and Lithostar/Lithoskop (first 15 years; group B), as well as additional endoscopic treatments for pancreatolithiasis. We also performed logistic regression analysis to detect various factors associated with the procedure. Results: For pancreatic head stones, ESWL disintegration was achieved in 93.7% of group A patients and 69.0% of group B patients (p=0.004), and adjunctive endoscopic treatment removed stones in 96.8% of group A patients and 73.0% of group B patients (p=0.003). Multivariate analysis revealed that lithotripter type (odds ratio, 6.99; 95% confidence interval, 1.56 to 31.33; p<0.01) and main pancreatic duct stricture (odds ratio, 2.87; 95% confidence interval, 1.27 to 6.45; p<0.01) were significant factors for ESWL fragmentation. Conclusions: The SLX F2 showed high performance in fragmenting the pancreatic duct stones. In addition, endoscopic adjunctive treatment improved the overall success rate of the procedure. The improved ESWL lithotripter has many advantages for patients undergoing pancreatic lithotripsy treatment.
Thermal rectification of asymmetrically-defective materials
Hiroyuki Hayashi,Yohei Ito,Koji Takahashi 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.1
We conducted numerical simulations of heat conduction in one-dimensional (1D) nonlinear lattices to reveal the mechanism of thermal rectification of asymmetrically-defective materials. A decreased spring constant simulates the defective lattice and the obtained temperature profile suggests a thermal resistance existing at the interface of two linked segments with different spring constants. Our numerical results suggest that the thermal rectification of two-segment system is dependent on the spring constant and temperature gradient. Introducing the estimated phonon band, most of the rectification mechanisms are clearly explained and performance limit as a thermal rectifier is found for the defective/pristine materials.