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Yong‑Ho Kim,Hyo‑Sang Yoo,Jeong‑Han Lee,Ik‑Hyun Oh,Hyun‑Kuk Park,Hyeon‑Taek Son 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.7
In order to investigate the microstructure and mechanical properties on Al–25Cr–5Si (at%) alloy, a mixed powder with pureelements and an alloy powder using a gas atomization process were used. Fine and high purity Al–25Cr–5Si (at%) alloypowder was successfully prepared by gas atomization and densified using a spark plasma sintering (SPS) process. The overallpowder size distribution of the mixed Al, Cr, and Si elemental powders was in the range of 10–15 μm. The atomized Al–Cr–Sialloy powder was fine and spherical in morphology and difficult to be formed by intermetallic formation. Densification wasclearly confirmed at 1000 °C, with almost isolated pores formed, by clear removal of pores between particles, deformationof particles, an increase in the number of contacts, and a change in size between particles. As a result of XRD analysis ofthe sintered compacts, single phase was observed using the mixed powder, but the compact using gas atomization remainedthe alloy phase even at the process temperature. The Vickers hardness of the compacts by mixed powder was observed at59.70 Hv and the compact using gas atomized powders on the temperature 1000 °C of the Vickers hardness increased to702.6 Hv. The compressive yield strength of the compact with mixed powder was 195.24 MPa and the compressive strengthof the compact with gas atomized powder increased to 802.07 MPa. It is considered not to be decomposed by the AlCrSi,Al13Cr4Si4and Al8Cr5phases sintering process, resulting from the improvement of mechanical properties.
식이섬유 보충용 식품의 섭취에 따른 여성의 비만관련 체구성 요인 및 배변만족도의 변화
임용택,강선영,김재등,김성수,김재우,이충영,김정모 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.1
The Purpose of this study was to investigate the effect of functional food including dietary fiber supplementation on body composition concerning obesity and defecation satisfaction of women. Twelve young healthy women but had defecation difficulty were participated as a subject. Body weight, %body fat, WHR mesurement and defecation satisfaction questionnaire were performed before and after 2 weeks' supplementation. The results of this study were as follows : First, Body composition concerning obesity such as body weight(p=.0065), % body fat(p =.0004) and WHR(p=.0007) after 2 weeks' functional food including dietary fiber supplementation was decreased significantly. Second, defecation satisfaction functional food including dietary fiber supplementation was increased significantly(p = .0039). This results suggested that functional food including dietary fiber supplementation should be recommended as effective dietary food for persons with obesity and defecation difficulty.
Ko, Young‐,Ho,Kim, Je‐,Hyung,Jin, Li‐,Hua,Ko, Suk‐,Min,Kwon, Bong‐,Joon,Kim, Joosung,Kim, Taek,Cho, Yong‐,Hoon WILEY‐VCH Verlag 2011 ADVANCED MATERIALS Vol.23 No.45
<P>Electrically driven hybrid light‐emitting diodes (LEDs) consisting of quantum dots, wires, and wells based on the nanometer‐sized pyramid GaN structure are reported by Taek Kim, Yong‐Hoon Cho, and co‐workers on page 5364. The LEDs exhibit mixed emissions from InGaN quantum dots, wires, and wells formed at the tops, edges, and sidewalls of the pyramids, respectively. The hybrid LEDs containing low‐dimensional quantum structures provide a broad‐band, highly efficient visible lighting source. </P>
이우석,정환용,김우식,김용찬,전택수,김남현,김규태 대한골절학회 2004 대한골절학회지 Vol.17 No.4
상완골 원위부 과간 골절은 소아에서는 매우 드물게 발생되는 골절로 대부분 주관절의 굴곡상태로 주관절 후방부에 직접적인 충격에 의해 발생하는 것으로 보고되고 있다. 전위가 없거나 경미한 경우 도수적 정복술 혹은 도수적 정복술 후 경피적 핀고정술을 시행하며, 전위가 심한 골절이거나 도수적 정복술이 불가능한 경우 관혈적 정복술 후 핀고정술을 시행하는 것으로 알려져 있다. 저자들은 전위된 상완골 원위부 과간 골절 환아 2예에서 각각 도수적 정복술과 관혈적 정복술 후 K 강선 고정술을 시행하여 만족한 결과를 얻었기에 보고하는 바이다. Intercondylar fractures of the distal humerus are very rare in children. The pattern of the fracture would suggest that the mechanism of injury involves a fall directly on the flexed elbow. Most agree that the undisplaced fracture can be managed conservatively. With increasing displacement and comminution, the opinions tend to differ. We suggest that closed reduction with percutaneous K wire pinning and open reduction with percutaneous K wire pinning offer a satisfactory methods by which to treat displaced intercondylar fracture in children.
산업폐수처리를 위한 MBR적용과 Membrane 선택에 관한 연구
김기량,이용택 慶熙大學校 材料科學技術硏究所 1999 材料科學技術硏究論集 Vol.12 No.-
The membrane bioreactor(MBR) is a modification of the activated sludge process, were the secondary settling tank is replaced by a membrane and the solids are separated from the effluent stream by means of membrane. In this study, We have done experment of MBR for treatment of high concentration organic industrial wastewater. This experiment used artificial wastewater to avoid changing of water quality which is changed by kinds of inflow wastewaters, Results of experiment. The hydrophilic membrane are more stable in the biomass filtration, and The UF membranes found to be more efficient for MBR application. The removal rate of COD is more than 98% at 2kg/m³day BOD loading. As a results MBR is more effective to endure problems related to activated sludge process.
PECVD법으로 증착된 전자소자용 thiophene 박막의 전기화학적 신뢰성에 관한 연구
김정구,박진택,최윤석,부진효,유용재 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.6
The corrosion failure of electronic devices has been a major reliability concern lately. This failure is an ongoing concern because of miniaturization of integrated circuits(IC) and the increased use of polymers in electronic packaging. In this paper plasma-polymerized thiophene films were considered as a possible candidate for an interlayer dielectric for multilever metallization of ultra large scale integrated (ULSI) semiconductor devices. The protective ability of above films as a function RF power in an 3.5 wt.% NaCl solution was examined by electrochemical methods and contact angle measurement. The protective efficiency of the film increased with increasing RF power, which induced the higher degree of cross-linking and hydrophobicity of the films.
金敬三,梁升澤,金用根,韓鳳浩,李應昊 釜山水産大學校 1972 釜山水産大學 硏究報告 Vol.12 No.1
북양산 냉동명태를 원료로서 열풍건조법으로 마른명태를 가공하였을 때, 건조중의 핵산관련물질 및 유리아미노산의 변화를 실험하였다. 원료육중에는 inosine 함량이 가장 많아 건물증량 기준으로 13.5μmole/g였고, 다음으로 함량이 높은 IMP였는데 5.1μmole/g로서 비교적 낮은 값이었다. 열풍건조중 IMP는 급격히 감소하여 잔존량은 14%에 불과하였으며, inosine은 건조중 50%감소하였다. 한편 hypoxanthine는 약 5배 증가하여 건물중량 기준으로 16.9μmole/g 였다. 건조후 3개월간 저장중에는 건조직후와 비교할 때 핵산관련물질의 변화는 거의 없었다. 그리고 원료 명태 육중의 유리아미노산 조성은 taurine이 가장 많아 전 유리아미노산의 40%를 차지하고 alanine, glycine, glutamic acid가 그 다음이고 비교적 함량이 낮은 것은 lysine, serine, histidine이며, 함량이 극히 낮은 것은 valine, aspartic acid, threonine, isoleucine, leucine등이었다. 열풍 건조중 유리아미노산의 질적 변화는 없었으며. 원료육 유리아미노산에 대하여 건조중 유리아미노산양이 20% 증가하였다. In this paper, the changes of nucleotides and their related compounds and free amino acid composition of Alaska Pollack muscle during hot-air dehydration and storage for three months were determined. The results showed that the contents of inosine and IMP in defrosted sample were 13.5 and 5.1 μmole/g respectively on dry base, and followed by hypoxanthine in order. ATP, ADP and AMP was very low in content. IMP and inosine tended to degrade rapidly during hot-air dehydration while hypoxanthine increased about five times. But the quantitative changes of nucleotides and their related compounds in the muscle of hot-air dehydrated Alaska Pollack during storage were not detected. Taurine was abundant in the muscle extracts, showing 40% of the total amino acid content and followed by alanine, glycine and glutamic acid. Lysine, serine and histidine were low in content respectively, and valine, aspartic acid, threonine and leucine were very poor. The qualitative change in the pattern of free amino acid composition of muscle extracts was not observed during hot-air dehydration. The increase of the total free amino acid during hot-air dehydration was approximately 20%.
국내 공공부문 설계시공일괄입찰방식의 낙찰자 선정방법 개선에 관한 연구
김만철,서용철,구교진,현창택 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1
Design-Build is considered as the project delivery system to manage construction process more efficiently than design-bid-build. So Korea government has encouraged Design-Build in public sector. But single selection method of weighted criteria doesn't provide the greatest value to owner. Therefore, there is a need to improve selection method to meet owner's needs and project characteristics. This study proposes four types of selection method. Each of selection method is focused on price, qualification, time. The use of these selection methods enable owner to provide the greatest value.