http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Fabrication of Porous Material Using Glass Abrasive Sludge
Chu Yong-Sik,Kwon Chun-Woo,Lee Jong-Kyu,Shim Kwang-Bo 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
A porous material with a surface layer was fabricated using glass abrasive sludge and expanding agents. The glass abrasive sludges were mixed with expanding agents and compacted into pellets. These pellets were sintered in the range of for 20min. The sintered porous materials had a surface layer with smaller pores and inner parts with larger pores. The surface layer and pores controlled the absorption ratio and physical properties.
Introduction to mineral hydrate insulation
Yong Sik Chu 한양대학교 세라믹연구소 2015 Journal of Ceramic Processing Research Vol.16 No.S1
AAC (Autoclaved Aerated Concrete) has relatively high thermal conductivity. In order to im-prove this property, mineralhydrate insulation has been developed. This material holds fine and uniform pores and is much more lightweight incomparison to AAC. It has the same workability, flame retardancy with AAC and improved thermal performance(0.040 ~ 0.050 W/mK). The fabrication method of mineral hy-drate is similar to that of AAC, however making normal slurrywith a considerable amount of foaming agent is difficult due to material segregation and collapse of slurry. In this study, themixing ratio of raw materials meeting the required insulation performance has been investigated. Physical characteristics ofmineral hydrate insulation were analyzed.
추용식(Chu, Yong-Sik),서성관(Seo, Sung-Kwan),임두혁(Im, Du-Hyuk),송훈(Song, Hun),이종규(Lee, Jong-Kyu),이승호(Lee, Seung-Ho) 한국건설순환자원학회 2011 한국건설순환자원학회지 Vol.6 No.4
본 연구에서는 ALC의 물리적 특성에 영향을 줄 수 있는 다양한 인자 중 규석 종류를 검토하였으며, 이때 회수슬러리를 재활용하였다. 규석은 문경 및 금평 규석을 사용하였으며, 규석 분말 입수분도 실험하였다. 규석의 XRD 분석과 광물상 분석을 통해 문경 규석의 주요 광물은 석영과 운모로, 금평 규석은 석영으로 구성되어 있음을 확인하였다. 더불어 금평 규석에 존재하는 석영의 결정성이 좀 더 양호하다는 것도 알 수 있었다. ALC의 밀도와 기공특성은 규석별 차이가 관찰되지 않았으나, 압축강도 및 A-수는 문경 규석보다 금평 규석 사용시에 양호한 특성을 발현하였다. 이러한 현상은 규석에 존재하는 주요 광물 결정종의 차이, 석영입자 결정성 및 미량성분 함량 차이 등의 영향으로 추정되었다. ALC was fabricated using cement, lime and quartzite by hydrothermal reaction. The kind of quartzite was reviewed for ALC properties and returned slurry was recycled in this study. Munkyung and Kumpyung quartzite was used and quartzite powder was experimented. The major mineral phase of Munkyung quartzite was quartz and muscovite crystal but that of Kumpyung was quartz. It was certain that crystallinity of Kumpyung quartzite was superior to Munkyung quartzite. Compressive strength and A-number of ALC with Kumpyung quartzite was higher than that of ALC with Munkyung quartzite under similar specific gravity. These results was resulted from major mineral phase, crystallinity and minor components of quartzite.
복부둔상 환자의 혈복강 진단에 있어 FAST의 유용성에 대한 고찰
추용식 ( Yong Sik Chu ),김옥준 ( Ok Jun Kim ),최성욱 ( Sung Uk Choi ),이정한 ( Jung Han Lee ) 대한외상학회 2006 大韓外傷學會誌 Vol.19 No.2
Purpose: We planned to determine the diagnostic capability of focused assessment with sonography for trauma (FAST) in cases of blunt abdominal injury (BAI). Methods: A retrospective analysis of FAST sheets was performed from April 2002 to December 2004. During the study period, 135 BAI patients were evaluated with FAST at the Emergency Department of Bundang CHA Hospital. Of this group, twenty-eight patients were excluded, leaving 107 patients for analysis. Abdomen CT (computerized tomography) or exploratory laparotomy confirmed the presence of hemoperitoneum. At the secondary survey, patients underwent a three-view FAST examination (LogicQ; General Electric, Waukesha, USA) by an emergency physician, followed within 2 hours by an abdomen CT or exploratory laparotomy. The FAST examination was considered positive if it demonstrated evidence of free intra-abdominal fluid. Results: There were 45 true-positive FAST examination, 57 true-negatives, 1 false-positive, and 4 false negatives (sensitivity 91.8%, specificity 98.3%, positive predictive value 97.8%, negative predictive value 93.4%). The area under the ROC curve was 0.951 for the FAST examination. Conclusion: FAST is a highly reliable method for screening patients suspected of having BAI for the presence or absence of hemoperitoneum. (J Korean Soc Traumatol 2006;19:135-142)
Inductance Compensation for the Quench Detection of the KSTAR CS Coil
Yong Chu,Yonekawa, Hirofumi,Yeong-ok Kim,In-Sik Woo,Kwang Pyo Kim,Seungje Lee IEEE 2016 IEEE transactions on applied superconductivity Vol.26 No.4
<P>Voltage-based QD is the primary way to guarantee that magnets can be protected against overheating because of its fastest response. However, central solenoid (CS) and poloidal field (PF) coils are operated in pulse currents, so resultant inductive voltages could be hundred times higher than quench detection voltage thresholds. For this reason, some inductive voltage compensation techniques have been adopted to discriminate the quench-induced resistive voltage from the voltage induced by self and mutual inductances between coils. Cowound voltage sensors and bridge circuits are used to eliminate inductive voltages, but achieving additional rejection of remaining inductive voltages is necessary. Simple comparison between bridge voltages or cowound voltages from upper and lower PF coils, which are symmetric to the equatorial plane, has been well operating for KSTAR. Another is mutual inductance compensation, where mutually induced voltages are estimated by using predefined inductances and temporal derivatives of PF coil currents and compared with measured voltages. Rogowski coils to measure the current derivatives of CS/PF coils, precompensated voltages with inductive voltages largely eliminated beforehand, and a data analysis system were prepared for the KSTAR PF 1 coil. Analysis of inductive voltage compensation was presented with the operational result in 2015 KSTAR campaign.</P>