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Image-Enhanced Endoscopy and Its Corresponding Histopathology in the Stomach
( Hisashi Doyama ),( Hiroyoshi Nakanishi ),( Kenshi Yao ) 대한간학회 2021 Gut and Liver Vol.15 No.3
In recent years, the technological innovation and progress of endoscopic equipment have been remarkable, and various endoscopic observation techniques have been developed. Among them, representative techniques are magnified observation and narrow-band imaging. Magnifying endoscopy with narrow-band imaging (M-NBI) can visualize superficial microanatomies in the stomach. The normal morphology of the microanatomy visualized using M-NBI differs according to the part of the stomach. The vessel plus surface (VS) classification system has been developed as a diagnostic criterion for early gastric cancer using M-NBI, and its usefulness has been proven. Based on the VS classification system, a magnifying endoscopy simple diagnostic algorithm for early gastric cancer (MESDA-G), a simplified algorithm used for early gastric cancer diagnosis, was created. We aimed to describe the anatomic structure of the stomach that can be viewed using M-NBI and outline the principles and clinical application of the VS classification system and MESDA-G. (Gut Liver 2021;15:329-337)
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PLASTIC DEFIRMATION AND FRACTURE OF SMALL CRYSTALS
Masao, Masao, Doyama 한국재료학회 1995 Fabrication and Characterization of Advanced Mater Vol.1 No.2
Body centered cubic whiskers having [100] and [110] axes were pulled by use of molecular dynamics using a super computer. The upper yield stress close to the theoretical strength was found. After the upper yield stress, phase transformation was observed at the same time the stress was greatly reduced. A new possible mechanism of twinning is proposed. The whiskers were pulled until they had broken into two pieces. Copper small crystals with and without a crack were sheared. It was observed that the edge dislocations were created at the surface and moved through and escaped from the crystals. Copper small single crystals with crack were pulled. A half dislocation was created near the tip of the crack Sharp yield stress was observed. In medium deformation disclocations on dofferent slip planes were created. Due to the cutting of dislocations the tensile stress increased.
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