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자체정열 방법을 이용한 GR(Gate-Recessed) SOI
이충근,한명석,홍신남 한국항공대학교 1997 論文集 Vol.35 No.-
SOI(Silicon-On-Insulator)소자는 집적도의 향상, 단채널 효과의 감소, 임계전압 이하에서 기울기 향상, 높은 이동도, latch-up 제거 등의 우수한 이점을 제공한다. 그러나 SOI소자는 current kink와 early breakdown과 같은 floating-body effect를 나타낸다. Floating-body effect를 줄이기 위해 fully depleted SOI를 사용해야 하나 면저항이 크기 때문에 GR(gate-recessed) SOI가 제안되었다. GR SOI는 floating-body effect와 면저항을 줄일 수 있지만 공정상 복잡성이 따른다. 이 논문에서는 self-alignment method를 이용한 GR SOI 를 제안하여 이러한 문제를 해결하였다. 제안되 구조를 시뮬레이션한 결과 드레인 전류의 크기 향상, floating-body effect제거를 위한 imapct-ionization current를 감소시킬 수 있었다. SOI(Silicon-On-Insulator) devices offer unique advantages such as reduction in short channel effects, improvement of subthreshold slope, higher mobility, latch-up free nature and so on. But these devices have two problems; floating-body effect causing current kink and early breakdown effect. Fully depleted SOI reduces floating-body effect, but it increases sheet resistances. So gate-recessed SOI is proposed. Gate-recessed SOI can reduce sheet resistance and floating-body effect, but is processing step are complicated. In this paper, gate-recessed SOI using selt-alignment method is proposed to solve the above problems. Proposed structure improved drain current level, decreased sheep resistances of sourcd/drain regions and impact ionization current for removal floating-body effect
김형일,김영근,장명익,김교한 대한치과기재학회 1997 대한치과재료학회지 Vol.24 No.1
The relationship between the isothermal age-hardening behavior and the phase transformation process in a dental casting Au-Ag-Cu-Pd alloy was investigated by means of hardness test, X-ray diffraction study. 1. The isothermal age-hardening behavior in the 350∼450℃ temperature range showed a similar tendency in the changes. However, the initial hardening was faster and the maximum hardness was higher and the overaging with softening was slower on aging at the lower temperature. 2. By the isothermal aging at 350∼450℃, the metastable Ag-rica α₁’and AuCu Ⅰ’orderd phases were formed from the supersaturated α phase prior to the final formation of the equilibrium Ag-rich α₁’and AuCu Ⅰordered phases. 3. By aging at 450℃, the age-hardening was attributed to the lattice strains of the parent phases resulting from the transformation of the αphase resulting from the transformation to the metastable phases. The X-ray diffraction peaks of the αphase showed a distinct shift toward both the high and low diffraction angles during transformation.
Han, Sei-Myoung,Han, Sang-Hun,Coh, Ye-Rin,Jang, Goo,Chan Ra, Jeong,Kang, Sung-Keun,Lee, Hee-Woo,Youn, Hwa-Young Nature Publishing Group 2014 Experimental and molecular medicine Vol.46 No.6
<P>Mesenchymal stem cells (MSCs) are attractive candidates for clinical repair or regeneration of damaged tissues. Oct4 and Sox2, which are essential transcription factors for pluripotency and self-renewal, are naturally expressed in MSCs at low levels in early passages, and their levels gradually decrease as the passage number increases. Therefore, to improve MSC proliferation and stemness, we introduced human Oct4 and Sox2 for conferring higher expansion and differentiation capabilities. The Oct4-IRES-Sox2 vector was transfected into human adipose tissue MSCs (ATMSCs) by liposomal transfection and used directly. Oct4 and Sox2 were successfully transfected into ATMSCs, and we confirmed maintenance of MSC surface markers without alterations in both red fluorescent protein (RFP) (control) and Oct4/Sox2-ATMSCs. Enhanced proliferative activity of Oct4/Sox2-ATMSCs was shown by WST-1 assay, and this result was further confirmed by cell counting using trypan blue exclusion for a long period. In addition, FACs cell cycle analysis showed that there was a reduction in the fraction of Oct4/Sox2-ATMSCs in G1 with a concomitant increase in the fraction of cells in S, compared with RFP-ATMSCs. Increased levels of cyclin D1 were also seen in Oct4/Sox2-ATMSCs, indicating acceleration in the transition of cells from G1 to S phase. Furthermore, Oct4/Sox2-overexpressing ATMSCs showed higher differentiation abilities for adipocytes or osteoblasts than controls. The markers of adipogenic or osteogenic differentiation were also upregulated by Oct4/Sox2 overexpression. The improvement in cell proliferation and differentiation using Oct4/Sox2 expression in ATMSCs may be a useful method for expanding the population and increasing the stemness of ATMSCs.</P>
대학사(大學史)의 편멱(編冪)과 대학(大學)아카이브즈(Archives)의 운용(運用)
한명근 ( Han Myoung Keun ) 숭실대학교 인문과학연구소 2000 인문학연구 Vol.30 No.-
This essay aims to search for the establishment and management of university archives focused on those archives in foreign countries and Korea. In early stages, university archives in the West began to be organized owing to evidence ability of their records. Then, the need to collect materials in publishing their history contributed to modernized university archives. This case is true to Japan. And university archives have been shaping based upon legislation of the management of records and archives in the public agencies act’ in Korea. University records are important to keep their pride and to confirm their identity and they are basic materials for the study of cultural, educational and social history, and have still the value of evidence. Their original function is to secure legal rights of their own members and to maximise administrative efficiency. If necessary conditions of regulations, independent organizations, professional manpower, necessary facilities, and legal and executive authorities could be satisfied, academic archives might do their proper roles. That is to say, university archives must make their main functions to collect and search academic records and to publish abstracts of research products, and exhibit their holdings for citizens around the academic institution. In addition, they must give basic matters for the writing of the history of university.
한동중,류재근,임연택,임재명 江原大學校 附設 環境硏究所 1998 環境硏究 Vol.15 No.-
This research aims to remove nitogen in the piggery wastewater by combined process with upflow anaerobic sludge blanket(UASB) and biofilm process. For the effective denitrification anaerobic and anoxic reactors were connected to a reactor. The effluent of aerobic reactor was recycled equally with influent in the upper filter of anaerobic reactor for denitrification and outlet of UBF reactor was connected to the settling tang with 1.5ℓ capacity and the settling sludge was repeatedly recycled to UASB zone. The organic loading rate of total reactor was operated from 0.4 to 3.1kgCOD/㎥/d and it was observed that the removal rate of TCOD was 80 to 95 percentage AMMonia nitrogen was removed over 90 percentage in the less volumetric loading rate than 0.1 kgN/㎥/d But because of non-limitation of organic materials, it was reduced to 70 perventage in the more volumetric loading rate than 0.6kgN/㎥/d But denitrification rate was observed 100 percentage in the all of loading rate. This is caused by the maintenance of optimum temperature, surfficient carbon source and competition of observed with the 71.7 percentage of influent COD. It was revealed that the most part of organic materials was removed in the aerobic and the anaerobic reactor because 38.4 percentage was conbersed into CH_(4) gas and 11 percentage was removed in the aerbic reactor with cell synthesis and metabolism. Besides, 5.7% organics was used to denitrification reaction and 3.7% organics related to sulgate reduction.