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Ti-Al 금속간화합물의 고온변형거동 및 라멜라조직의 결정방위 분포
박규섭(Kyu-Seop Park),강창용(Chang-Yong Kang),이근진(Keun-Jin Lee),정한식(Han-Shik Chung),정영관(Young-Guan Jung),福富洋志(Hiroshi Fukutomi) Korean Society for Precision Engineering 2004 한국정밀공학회지 Vol.21 No.10
High temperature uniaxial compression tests in the alpha single phase region were carried out on the Ti-43mol%AI intermetallic compound, in order to obtain oriented lamellar microstructure. The compression deformation temperatures and strain rates are from 1573K to 1623K and 1.010?⁴/s to 5.0×10?³/s, respectively. Fully lamellar microstructure was observed after the uniaxial compression deformation in a single phase region followed by cooling to room temperature. Lamellar colony diameter depended on strain rates and test temperatures. The diameter varied between 860㎛ and 300㎛ . Stress-strain curve showed a work softening and the size of lamellar colony diameter varied depending on peak stresses. This shows the occurrence of dynamic recrystallization. Texture measurements after the uniaxial compression deformation, showed the development of fiber during dynamic recrystallization. It is seen that the area for the maximum pole density existed in 35 degrees away from the compression plane. The texture sharpens with a decrease in strain rate.
개량 9Cr-1Mo 강의 장시간 크리프거동에 미치는 경도와 하부조직의 영향
박규섭(Kyu-Seop Park),이근진(Kun-Jin Lee),정한식(Han-Shik Chung),김정호(Jung-Ho Kim),정영관(Young-Guan Jung),엔도타카오(Takao Endo) Korean Society for Precision Engineering 2004 한국정밀공학회지 Vol.21 No.2
Interrupted creep tests were carried out on the Mod.9Cr-1Mo steel in order to investigate the structural degradation during creep. The ranges of creep stress and temperature were from 71 to 167MPa and 873 to 923K, respectively. The change of hardness and tempered martensitic lath width were measured in the grip and gauge parts of interrupted specimens. The lath structure was thermally stable in static conditions, but was not stable during creep, and the structural evolution was enhanced by creep strain. The relation between the change in lath width and strain was described in the from, △W=a(W<SUB>s</SUB>-W<SUB>o</SUB>)ㆍε, where ε is the strain, W<SUB>o</SUB> is the initial lath width, W<SUB>s</SUB> is the final lath width depending solely on stress, and a is the constant of the magnitude of 0.67 ㎛ /strain. The change in Vickers hardness was expressed by a one-valued function of creep life consumption ratio. Based on the empirical relation between strain and lath width, a model was proposed to explain the relation between change in hardness and creep life consumption ratio. The model revealed that about 65% of dislocations in lath structures were eliminated by the migration of subboundaries.
CNN기초로 세 가지 방법을 이용한 감정 표정 비교분석
양창희,박규섭,김영섭,이용환,Yang, Chang Hee,Park, Kyu Sub,Kim, Young Seop,Lee, Yong Hwan 한국반도체디스플레이기술학회 2020 반도체디스플레이기술학회지 Vol.19 No.4
CNN's technologies that represent emotional detection include primitive CNN algorithms, deployment normalization, and drop-off. We present the methods and data of the three experiments in this paper. The training database and the test database are set up differently. The first experiment is to extract emotions using Batch Normalization, which complemented the shortcomings of distribution. The second experiment is to extract emotions using Dropout, which is used for rapid computation. The third experiment uses CNN using convolution and maxpooling. All three results show a low detection rate, To supplement these problems, We will develop a deep learning algorithm using feature extraction method specialized in image processing field.
오스테나이트계 316L 스테인리스강의 강도 및 감쇠능에 미치는 미세조직의 영향
손동욱(DONG-WOOK SON),이종문(JONG-MOON LEE),김효종(HYO-JONG KIM),남기우(KI-WOO NAM),박규섭(KYU-SEOP PARK),강창룡(CHANG-YONG KANG) 한국해양공학회 2006 韓國海洋工學會誌 Vol.20 No.1
The effects of microstructure on the damping capacity and tensile properties of 316L stainless steel were investigated. Increasing the degree of cold working, the volume fraction of ε-martensite decreased after rising to maximum value at specific level of cold working, the volume fraction of α'-martensite slowly increased and then dramatically increased from the point of decreasing ε-martensite volume fraction. Increasing the degree of cold working, the behavior of damping capacity is similar to that of the ε-martensite. After the damping capacity showing the maximum value at about 20% of cold rolling, damping capacity was decreased with the volume fraction of ε-martensite. Tensile strength was proportional to the volume fraction of α'-martensite, and elongation steeply decreased in the range low volume fraction of α'-martensite, then slowly decreased in range the above 10% volume fraction of α'-martensite. The damping capacity and elongation is strongly controlled by the volume fraction of ε martensite with liner relationship. However, the effect of the volume fraction of α'-martensite and austenite phase on the damping capacity was not observed. Tensile strength was governed by the volume fraction of α'-martensite.
강성,박규섭,배동식 국립7개대학공동논문집간행위원회 2005 공업기술연구 Vol.5 No.-
Silica-zirconia composite nanoparticles have been synthesized by a metal alkoxide hydrolysis and condensation. The size and composition of the synthesized particles can be controlled by manipulating the relative rates of the hydrolysis and condensation reaction of precursor. The average size of range of synthesized silica-zirconia composite nanoparticles was about in the size range of 30-100nm. The effects of synthesis parameters, such as the molar ratio of water to precursor and the molar ratio of water to surfactant, are discussed.