La structure du pouvoir impérial au Japon du viie au xie siècle

La monarchie constitue un des thèmes majeurs des recherches historiques au Japon. J’ai consacré mes conférences au système du tennô en essayant de montrer en quoi ce système est différent du pouvoir dans les sociétés médiévales européennes et quels sont les points communs entre le Japon et l’Occident. J’ai traité cette question sous forme de quatre thèmes

Atomic cluster expansion force field based thermal property material design with density functional theory level accuracy in non-equilibrium molecular dynamics calculations over sub-million atoms

Non-equilibrium molecular dynamics (NEMD) techniques are widely used for investigating lattice thermal conductivity. Recently, machine learning force fields (MLFFs) have emerged as a promising approach to enhance the precision in NEMD simulations. This study is aimed at demonstrating the potential of MLFFs in realizing NEMD calculations for large-scale systems containing over 100,000 atoms with density functional theory (DFT)-level accuracy. Specifically, the atomic cluster expansion (ACE) force field is employed, using Si as an example. The ACE potential incorporates 4-body interactions and features a training dataset consisting of 1000 order structures from first-principles molecular dynamics calculations, resulting in a highly accurate vibrational spectrum. Moreover, the ACE potential can reproduce thermal conductivity values comparable with those derived from DFT calculations via the Boltzmann equation. To demonstrate the application of MLFFs to systems containing over 100,000 atoms, NEMD simulations are conducted on thin films ranging from 100 nm to 500 nm, with the 100 nm films exhibiting defect rates of up to 1.5%. The results show that the thermal conductivity deviates by less than 5% from DFT or theoretical results in both scenarios, which highlights the ability of the ACE potential in calculating the thermal conductivity on a large scale with DFT-level accuracy. The proposed approach is expected to promote the application of MLFFs in various fields and serve as a feasible alternative to virtual experiments. Furthermore, this work demonstrates the potential of MLFFs in enhancing the accuracy of NEMD simulations for investigating lattice thermal conductivity for systems with over 100,000 atoms.Comment: 24 pages including with supporting infomatio

Distributed trajectory generation for multiple manipulators using virtual dynamics

This paper proposes a trajectory generation method for multiple manipulators through cooperative and competitive interactions among subsystems corresponding to each manipulator. The method can generate the trajectories of multiple manipulators in a parallel and distributed way using virtual dynamics. The virtual dynamics for each manipulator result in virtual interaction forces which represent the interaction among manipulators. It is shown that the method is effective not only for simple cooperative tasks such as positioning a common object, but also for more complicated tasks including relative motions among manipulators

地方大学国際化のためのバランス・スコアカード経営戦略：地方創生への貢献

関西学院大

Malacoplakia of probable retroperitoneal origin.

A case of extravesical malacoplakia, the first case in Japan, is described in detail. The patient was a 61-year-old woman with a right flank mass. Radiologically, the mass was thought to be of the renal origin. Surgically, however, the tumor was found attached not only to the cortical surface but extended to the retroperitoneum and psoas muscle. Pathological examination confirmed the lesion to be malacoplakia characterized by the presence of von Hansemann cells and Michaelis-Gutmann bodies.</p