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RISS 인기검색어
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- 저자 : 김한성 (검색결과 1,091 건)
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局部義齒用 合金의 熱處理에 依한 機械的性質의 實驗的 硏究
金漢聲 대한치과기재학회 1982 대한치과재료학회지 Vol.9·10 No.1
The purpose of this study was to investigate the effect of heat treatment on mechanical properties of cobalt-chromium base alloys and nickel-chromium base alloys. Two removable partial denture alloys, Regalloy(Co-Cr base alloy), and Ticonium Premium 100 (Ni-Cr base alloy) were evaluated three ways: 1) in the cast condition' 2) after heat treatment for 15 minutes at 1300, 1550, or 1800℉ followed by quenching; 3) in quenching after heat treatment for 15 minutes at 1800℉ followed by reheating for 15 minutes at 1300℉ and quenching. After heat treatments, the ultimate tensile strength, the yield strength at 0.1% and 0.2% offsets, the total percent elongation, and the Rockwell 30N hardness were determined. The data was statistically analyzed, and the microstructures were examined using a metallographic microscope. The results were obtained as follows; 1. Ticonium Premium 100 showed higher total percent elongation and lower Rockwell 30N hardness than Regalloy. 2. The mechanical properties of Ticonium Premium 100 showed significant differences among various heat treatments, while those of Regalloy were found to be no significantly different. 3 For Ticonium Premium 100, higher temperatures of heat treatment decreased strength and hardness considerably, and increased total percent elongation remarkably. 4. For Ticonium Premium 100, the highest yield strength at 0.1% and 0.2% offsets was recorded when specimens were heat-treated at 1300℉. 5. After Ticonium Premium 100 was water-quenched at 1800℉ followed by reheating for 15minutes at 1300℉, there was a general improvement in ultimate tensile strength, hardness and toal percent elongation. 6.As the heat treatment temperature increased, the microstructures of Ticonium Premium 100 showed increased homogenization between the nickel-rich and chromium-rich phase. 7. After Ticonium Premium 100 was reheated, the microstructures were found fine precipitates within grain. 8. The microstructures of Regalloy were relatively unchanged, while the microstructures of reheated Regalloy showed the precipitation of a small amount of carbide.
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소규모 사무공간에서 디밍제어를 이용한 조명에너지 절약에 관한 연구
김한성,김강수 한국조명전기설비학회 2003 조명·전기설비학회논문지 Vol.17 No.5
This paper presents field measurements on daylighting and electric lighting with dimming controlled systems for a small office in Seoul, Korea. And the main purpose of this study is to provide the evaluation data of lighting energy performance when a dimming system is installed. For the performance evaluation, the mock-up room(3.6x7.2x2.6[m]) was used for the actual test. The results of this study were as follows; 1) The correlation between daylight illuminance at a workplane(Ed) and the photosensor signal(Sd) was an important factor affecting the performance of daylight responsive dimming system, 2) The mock-up office space gained a sufficient workplace illuminance of 579[lux] with the dimming control system 3) About 53[%J of monthly lighting energy could be saved using the dimming control system. 본 연구에서는 소규모 사무공간을 대상으로 주광과 인공조명의 성능 평가를 위한 디밍제어 시스템의 실험을 실시함으로써, 사무소 건물의 조명에너지 절약을 도모할 수 있는 성능 평가 자료를 제시하고자 한다. 본 연구에서는 성능 평가폭 위해 Mock-Up Room(3.6${\times}$7.2${\times}$2.6(m))을 사용하여 측정하였으며, 연구 결과는 다음과 같다; 1) 주광작업면조도와 센서조도간의 상관관계는 디밍 시스템의 성능에 영향을 미치는 중요한 요소이다. 2) 디밍 시스템을 적용한 본 실험에서는 주광과 인공조명을 포한함 총 작업면조도는 월평균 579[lux], 월간 에너지 절감율은 약 53[%]로 나타났다.
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병렬 커패시터를 이용한 직류 초퍼의 출력특성에 관한 연구
金漢星 건국대학교 1984 學術誌 Vol.28 No.2
DC choppers are usually to control the output of DC motor by varying the average output value of chopper. But the chopped output by the switching operation gives rise to the ripple in the output side and the harmonics in the source side. Also the discontinuous current mode makes the output characteristics worse in speed regulation, system gain and accuracy than the continuous mode. To improve these disadvantages, the capacitor chopper circuit is suggested and its characteristics are investigated. And the analytical expression is approximately derived from the equivalent circuit of the output capacitor filter C.
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변형 필라델피아 전좌인 t(11;22)(q25;q11.2)를 보인 만성골수성백혈병 1예
김한성,조현찬,김선희,문연숙,남정현,최종원,김진주 대한진단검사의학회 2006 Annals of Laboratory Medicine Vol.26 No.4
저자들은 t(11;22)(q25;q11.2)의 변형필라델피아 전좌를 보인만성골수성백혈병 사례를 경험하였다. 관찰된 11q25의 절단점은지금까지의 보고에서 발견할 수 없었고, 역전사중합효소연쇄반응과 형광동소교잡법을 이용하여BCR/ABL 재배열을 확인할 수있었다.
RISS
