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박봉구 ( Bong Koo Park ) 대한내과학회 1969 대한내과학회지 Vol.12 No.6
In this report, a case of gastric cancer with marked gastric ptosis is reported. A 63 years old woman has complained of epigastric fullness and intermittent abdominal pain for about twenty years, On the physical examination, there were epigastric tendernes
반고상 성형법에 의한 Mg합금 박판재의 제조에 관한 연구
김정민 ( Jeong Min Kim ),박봉구 ( Bong Koo Park ),김기태 ( Ki Tae Kim ),정운재 ( Woon Jae Jung ) 한국주조공학회 2002 한국주조공학회지 Vol.22 No.5
N/A Cast AZ91 and extruded AM50 alloys were isothermally heat solid/liquid coexistent temperatures, and semi-solid formed into sheets. Mold filling ability of semi-solid slurry with different liquid fractions was investigated in relation to process variables such as injection speed and mold temperature. Relatively uniform distribution of solid particle size and liquid fraction were observed throughout the semi-solid formed sheet. AZ91 alloy sheets were also manufactured by conventional die casting and compared with the semi-solid formed. It was found that the surface was more smooth and the dimensional accuracy was higher in case of the semi-solid formed.
AZ31-(0~0.5)%Ca 합금의 미세조직과 기계적 성질
전중환 ( Joong Hwan Jun ),박봉구 ( Bong Koo Park ),김정민 ( Jeong Min Kim ),김기태 ( Ki Tae Kim ),정운재 ( Woon Jae Jung ) 한국열처리공학회 2004 熱處理工學會誌 Vol.17 No.5
N/A Influences of Ca addition on microstructure and room temperature mechanical properties have been studied for AZ31(Mg-3%Al-1 %Zn-0.2%Mn)-(0~0.5)%Ca wrought alloys, based on experimental results from metallography, X-ray diffractometry and mechanical tests. Yield strength, ultimate tensile strength and hardness of the alloys increased remarkably with increasing Ca content, whereas elongation was deteriorated continuously. Microstructural examination revealed that Ca addition efficiently refined grains of α(Mg) phase and that some of the Ca dissolved in ß(Mg_(17)Al_(12)) precipitates. The former and the latter facts are thought to be responsible for improved strength and loss of ductility of the AZ31+Ca wrought alloys, respectively.
최흥재 ( Heung Jai Choi ),허갑범 ( Kap Bum Huh ),정진각 ( Chin Kak Chung ),박정호 ( Jung Ho Park ),박봉구 ( Bong Koo Park ) 대한내과학회 1969 대한내과학회지 Vol.12 No.4
A case of choleduodenal fistula caused by duodenal ulcer is reported. A 19 year-old high school boy was hospitalized because of 2 months intermittent postprandial epigastric pain and vomiting which became more severe 1 week prior to the admission. Physical