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이정일,이호준,윤요한,이주연,조현수,조현,류정호,Lee, Jung-Il,Lee, Ho Jun,Yoon, Yo Han,Lee, Ju Yeon,Cho, Hyun Su,Cho, Hyun,Ryu, Jeong Ho 한국결정성장학회 2017 한국결정성장학회지 Vol.27 No.2
최근 수년 동안 Sn-3.0Ag-0.5Cu(weight%) 조성의 합금은 주요 전자 제조업체들의 대표 무연솔더 조성으로 다양한 전자제품의 제작에 적용되어 왔다. 그러나 최근 Ag 가격의 급격한 상승과 전자산업의 저가격화 전략으로 인해 솔더 재료에서의 Ag 함량의 감소가 지속적으로 요구되고 있다. 본 연구에서는 Sn-3.0Ag-0.5Cu 조성의 무연솔더를 주석, 은 및 구리 금속분말의 용융을 이용하여 합금화 하였다. 제조한 Sn-3.0Ag-0.5Cu 샘플에 대한 결정구조 및 미세구조를 XRD, 광학현미경, FE-SEM 및 EDS 분석을 이용하여 검토하였다. 분석결과, 제조된 Sn-3.0Ag-0.5Cu 샘플은 ${\beta}-Sn$, ${\varepsilon}-Ag_3Sn$ 및 ${\eta}-Cu_6Sn_5$ 결정으로 구성되어 있었다. In the past few years, Sn-3.0Ag-0.5Cu (weight%) solder composition has been a representative material to electronic industries as a replacement of Pb-base solder alloy. Therefore, extensive studies on process and/or reliability related with the composition have been reported. However, recent rapid rise in Ag price has demanded solder compositions of low Ag content. In this study, Sn-3.0Ag-0.5Cu solder bar sample was fabricated by melting of Sn, Ag and Cu metal powders. Crystal structure and element concentration were analyzed by XRD, optical microscope, FE-SEM and EDS. The Sn-3.0Ag-0.5Cu solder sample was composed of ${\beta}$-Sn, ${\varepsilon}-Ag_3Sn$ and ${\eta}-Cu_6Sn_5$ phases.
옥시불화이트륨 분말의 고상합성 및 플라즈마 스프레이 코팅 적용
이정일,김영주,채희라,김윤정,박성주,신경선,하태빈,김지현,정구훈,류정호,Lee, Jung-Il,Kim, Young-Ju,Chae, Hui Ra,Kim, Yun Jeong,Park, Seong Ju,Sin, Gyoung Seon,Ha, Tae Bin,Kim, Ji Hyeon,Jeong, Gu Hun,Ryu, Jeong Ho 한국결정성장학회 2021 한국결정성장학회지 Vol.31 No.6
반도체 회로를 제조하기 위해서 에칭, 세척, 증착 등의 공정들이 반복적으로 진행된다. 따라서 이러한 공정이 진행되면 진공장비 내부는 부식성이 높은 가혹한 플라즈마 환경에 노출되게 된다. 따라서 반도체 공정 장비의 내부를 플라즈마 노출에 강한 재료를 사용하여 코팅층의 에칭과 오염 입자의 생성을 최소화하여야 한다. 본 연구에서는 고상합성법에 의해 Y<sub>2</sub>O<sub>3</sub>와 YF<sub>3</sub> 분말을 원료물질로 옥시불화이트륨(YOF)를 성공적으로 합성하였다. Y<sub>2</sub>O<sub>3</sub>와 YF<sub>3</sub> 분말의 혼합비율은 1.0:1.0에서 1.0:1.6까지 조절하였으며, 혼합비율이 합성된 YOF 분말의 결정구조와 미세구조에 미치는 영향을 XRD와 FE-SEM으로 조사하였다. 합성된 YOF 분말을 이용하여 알루미늄 기판에 플라즈마 스프레이법으로 성공적으로 코팅하였다. In order to manufacture a semiconductor circuit, etching, cleaning, and deposition processes are repeated. During these processes, the inside of the processing chamber is exposed to corrosive plasma. Therefore, the coating of the inner wall of the semiconductor equipment with a plasma-resistant material has been attempted to minimize the etching of the coating and particle contaminant generation. In this study, we synthesized yttrium oxyfluoride (YOF) powder by a solid-state reaction using Y<sub>2</sub>O<sub>3</sub> and YF<sub>3</sub> as raw materials. Mixing ratio of the Y<sub>2</sub>O<sub>3</sub> and YF<sub>3</sub> was varied from 1.0:1.0 to 1.0:1.6. Effects of the mixing ratio on crystal structure and microstructure of the synthesized YOF powder were investigated using XRD and FE-SEM. The synthesized YOF powder was successfully applied to plasma spray coating process on Al substrate.
간장 ( 肝腸 ) 및 담도 ( 膽道 ) : B형 활동성 간염 환자에서 단기 Prednisolone과 ARA - AMP 겸용 치료의 경과에 따른 면역 지표의 변화에 관한 연구
민영일(Young Il Min),장린(Rin Chang),김병호(Byung Ho Kim),장영운(Young Woon Chang),이정일(Joung Il Lee),황이숙(Yi Sook Hwang),김정원(Jeong Won Kim),김효종(Hyo Jong Kim) 대한소화기학회 1990 대한소화기학회지 Vol.22 No.3
N/A Withdrawal of corticosteroids in patients with chronic type B hepatitis is frequently associated with enhanced cellular immune response to hepatitis B virus. This immunolgic rebound generally results in a transient reduction in levels of HBV-DNA and DNA polymerase, and seldom results in clearance of HBeAg. There was a pilot study that the combination of a short course of prednisone followed by ARA-AMP was potentially synergistic. The object of this study was to determine the effect of short term prednisolone followed by ARA-AMP on the immune system in patients with chronic active ltepatitis-B. Patients were started 40 mg of prednisolone daily for 4 weeks. After prednisolone therapy was discontinued, patients received no medication for 2 weeks. ARA-AMP was then given for 4 weeks at a dose of 500 mg daily. Immune parameters such as T cell subsets, IL, production, NK cell activeity, and LAK cell activity were tested before and during treatement period. The resullts were as follows. 1) Basal IL2 production in CAH-B (71.3 unit/ml) was lower than that of normal control (p<0.025). Basal NK activity, T4/T8 ratio and LAK activity of CAH-B were similar to those of normal control. 2) After prednisolone treatment, IL2 production, NK cell activity and LAK cell activity were significantly lower than those of basal value. 3) After induction of immune rebound, IL, production increased to 84.8 unit/ml (basal 71.3 unit/ml,
등숙기간중 온도와 벼 이삭 지경간 곡립의 형태 형성차이
이정일,신진철,김제규,김이훈,조동하,Lee, Jeong-Il,Shin, Jin-Chul,Kim, Je-Kyu,Kim, E-Hun,Cho, Dong-Ha 한국작물학회 1995 한국작물학회지 Vol.40 No.5
To clarify the effect of temperature during ripening on grain quality, rice plant which was grown under normal natural conditions untill heading stage was subjected various temperature regimes during grain filling stage. Three varieties, Odaebyeo, Hwaseongbyeo and Dongjinbyeo were used. Grains on primary and secondary-rachis branches were harvested seperately and measured specific gravity, grain size and weight. The optimum daily temperature for grain filling of rice during ripening period was about 22$^{\circ}C$ and grain filling under alternating temperature(26/18$^{\circ}C$, day /night) was better than constant temperature (22 /22$^{\circ}C$) based on 1, 000-grain weight and yield. Grain size based on volume per grain was smallest under the constant temperature of 22 /22$^{\circ}C$. The size of secondary-rachis branches was smaller than primary-rachis branch. The difference in size between primary and secondary-rachis branches was biggest in Hwaseongbyeo, followed by Odaebyeo and Dongjinbyeo. The temperature regimes treated did not influence the grain size difference between branches so much. The 1000-grain weight was lighter under high temperature than low temperature in Odaebyeo, but reversed tendency was observed in Dongjinbyeo of secondary rachis-branches.
이정일,류정호,Lee, Jung-Il,Ryu, Jeong Ho 한국교통대학교 융복합기술연구소 2014 융ㆍ복합기술연구소 논문집 Vol.4 No.1
White LEDs (light-emitting diodes) are promising new-generation light sources which can replace conventional lamps due to their high reliability, low energy consumption and eco-friendly effects. This paper briefly reviews recent progress of oxy/nitride host phosphor and quantum dot materials with broad excitation band characteristics for phosphor-converted white LEDs. Among oxy/nitride host materials, $M_2Si_5N_8:Eu^{2+}$, $MAlSiN_3:Eu^{2+}$ M-SiON(M=Ca, Sr, Ba), ${\alpha}/{\beta}-SiAlON:Eu^{2+}$ are excellent phosphors for white LED using blue-emitting chip. They have very broad excitation bands in the range of 440-460 nm and exhibit emission from green to red. In this paper, In this review we focus on recent developments in the crystal structure, luminescence and applications of the oxy/nitride phosphors for white LEDs. In addition, the application prospects and current trends of research and development of quantum dot phosphors are also discussed.
이정일,홍창우,류정호,Lee, Jung-Il,Hong, Chang Woo,Ryu, Jeong Ho 한국결정성장학회 2015 한국결정성장학회지 Vol.25 No.1
최근 콘크리트의 품질을 향상시키기 위하여 플라이애쉬, 고로슬래그, 실리카퓸과 같은 각종 시멘트 혼화재에 대한 많은 연구가 진행되고 있다. 이에 본 연구에서는 동합금 제련시 발생되는 슬래그의 시멘트 대체재로서의 활용성을 확인하기 위해 동합금 슬래그를 미분쇄하여 상용 포틀란트 시멘트에 첨가하고, 첨가량 변화에 따른 시멘트 모르타르의 유동성, 흡수율, 단위용적중량, 압축강도 및 휨강도 변화를 조사하였다. 또한 5 % 황산용액에서의 동슬래그 함유 시멘트 모르타르의 무게변화를 28일 동안 측정하여 화학적 저항성을 평가하였다. The cement mixtures such as flyash, iron-slag and silica fume have been actively studied in order to increase the quality of concrete. In this study, the grinded copper-slag with different proportion was added to portland cement. The physical properties of the cement mortars, (i.e.) flowability, absorption, compressive strength and flexural strength, were investigated for the potential application to the cement. Also, the influence of the acid on the chemical resistance of the cement mortars with copper-slag was evaluated by monitoring the weight variation of the cement mortars under 5 % sulfuric acid for 28 days.
섬유아세포의 이동과 교원질 겔의 수축에 미치는 일산화질소의 영향
이정일,이수윤,김재우,Jeong Il Lee,Soo Yoon Lee,Jae Woo Kim 대한안과학회 2008 대한안과학회지 Vol.49 No.4
Purpose: To investigate the role of nitric oxide (NO) on the migration of cultured human Tenon’s capsule fibroblasts (HTCF) and contraction of collagen gel. Methods: After artificial wounding, the primarily cultured HTCF were exposed to an NO donor such as sodium nitroprusside (SNP), S-Nitroso-N-acetylpenicillamine (SNAP), or dexamethasone at various concentrations. The cellular migration was measured up to five days. After embedding the cells in the collagen gels, the amount of contraction by the gels was also measured. Cellular survival and NO production were measured with MTT assay and Griess assay, respectively. Results: Cellular survival was decreased by both NO donors but not by dexamethasone. SNP inhibited migration of HTCF in a dose-dependent manner and enhanced contraction of collagen gels. However, SNAP had no effect on the cellular migration or gel contraction. Dexamethasone inhibited cellular migration but did not affect the contraction of collagen gels. Conclusions: Among the NO donors, only SNP inhibited migration of HTCF and enhanced contraction of collagen gels in vitro. Thus, the effects between the two NO donors on fibroblast‐induced wound healing differ.