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허무영,석윤종 대한금속재료학회(대한금속학회) 1990 대한금속·재료학회지 Vol.28 No.7
The preferred orientations and microstructures of the cold rolled 0.004%C and 0.022%C steel were studied. The crystallographic deformation theory was applied to analyse the results of the x -ray measurements and TEM observations. It was found that the rolling texture of the steels could be described by a {111}//ND fiber and a $lt;110$gt;//ND fiber. The equiaxed cells developed by homogeneous slip might be a major deformation mechanism of the steels at low rolling reductions. At medium to high rolling reductions, however, the major deformation mechanism was changed to the formation of the microbands, which was developed by a localized inhomogeneous slip. As further increasing reduction, the deformation mechanism was changed consecutively as clustering of microbands, decreasing microband thickness, a rotation of microbands to the rolling direction and a development of shear bands in the hard grains.
단백질 자연구조의 인식에 있어서 라마찬드란 각의 역할 및 기여도
허무영,장익수,김석만,문은정,정광훈,천무경 한국물리학회 2004 새물리 Vol.48 No.3
. In order to recognize better native folds of proteins, we improved the old environmental parameters of amino acids and set up new environmental parameters. Usually, the feature of protein structures is extracted by using environmental parameters which include the protein's secondary structure and the burial degree of amino acids in a protein's structure. In this research, we investigated the important role of the Ramachandran angles in the environmental parameters. For the each cases of energy (score) functions without and with Ramachandran angles and using a statistical method, the success ratios for recognizing the proteins' native structures were respectively, 62.4 % and 77.3 %. Combining Ramachandran angles with the old environmental parameters of the protein energy function improves it's capability to recognize the native structures of proteins by 14.9 %. An effort to achieve complete recognition of all native folds of 1,006 proteins is now being undertaken by using perceptron learning and protein threading.
Fcc 금속에서 Sachs 와 Taylor 소성이론에 의한 변형쌍정 발생의 해석
허무영 대한금속재료학회(대한금속학회) 1989 대한금속·재료학회지 Vol.27 No.2
Dependence of the deformation twinning on the orientation of grains has been studied in Cu and Cu-Bn alloys. The experimental results obtained from the X-ray texture measurement and the electron microscopical investigation were interpreted by the theoretical considerations based on Sachs and Taylor. In most orientations it was showed that the Tailor deformation cannot be achieved only by the deformation twinning. During the rolling deformation the orientations with TD//<110> can be sucessfully deformed by twinning under the Taylor's strain condition as well as the Sachs's stress condition. The transition from the pure metal to the alloy type rolling texture was caused by the development of twinning in Cu-position {112}<111> which was the most probable orientation for twinning following the deformation theories.