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 Y₂O₃와 YF₃ 분말을 원료물질로 옥시불화이트륨(YOF)를 성공적으로 합성하였다. Y₂O₃와 YF₃ 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 Y₂O₃ and YF₃ as raw materials. Mixing ratio of the Y₂O₃ and YF₃ 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.

Sn-Ag-Cu 무연합금의 미세구조 분석

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.

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,

베리어 필름이 양자점 필름의 광특성에 미치는 영향

이정일,김영주,류정호,Lee, Jung-Il,Kim, Young-Ju,Ryu, Jeong Ho 한국결정성장학회 2020 한국결정성장학회지 Vol.30 No.2

Quantum dot efficiency was increased to evaluate reliability and optical characteristics using incidental materials. Quantum dot was manufactured by wrapping a sandwich type quantum layer using a product with a barrier property to prevent water and oxygen because it is vulnerable to oxygen and moisture. We used the three quantum dot films consisting of quantum dot only and quantum dot products consisting of film and barrier film combined with PET in the quantum dot product to evaluate the change over 650 hours under high temperature and high humidity conditions at 60℃ and 90 % humidity. As a result, the quantum dot product with Barrier Film has lowered luminance by 8 %, CIE x by 2 % and CIE y by 8 %. Quantum dot products exposed to moisture and oxygen were oxidized and measured low before measurement. 양자점은 산소와 수분에 취약하기 때문에 수분과 산소를 막아줄 수 있는 베리어 특성을 가진 제품을 이용하여 샌드위치 형식 양자점 층을 감싸는 형태로 제조하여 양자점의 광학적 신회성을 평가하였다. 다른 보호막이 없는 양자점 레진으로만 이루어진 필름, 양자점 필름과 PET를 합지한 필름 및 베리어 필름을 합지한 양자점 필름, 3가지를 이용하여 온도 60℃, 습도 90 %인 고온고습 조건에서 650시간 동안 변화를 평가를 진행하였다. 베리어 필름과 합지한 양자점 필름 제품은 휘도와 CIE x 및 CIE y 값이 유지되는 반면 PET와 합지한 양자점 필름 제품은 휘도 8 %, CIE x 2 % 및 CIE y 8 %가 낮아졌다. 또한 수분과 산소에 그대로 노출되었던 양자점 필름 제품은 측정 전부터 산화되어 낮게 측정되었으며 최종적으로 휘도 12 %, CIE x 9 % 및 CIE y 14 %가 낮게 측정되었다.

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.

Mn-Co-Ni 서미스터의 결정구조 분석

이정일,민성욱,류정호,Lee, Jung-Il,Mhin, Sungwook,Ryu, Jeong Ho 한국결정성장학회 2015 한국결정성장학회지 Vol.25 No.5

본 연구에서는 Mn-Co-Ni 삼성분계로 이루어진 NTC 서미스터의 cubic 스핀넬 결정구조의 변화를 고찰하고자 하였다. Mn, Co, Ni로 이루어진 산화물 원재료 분말들을 혼합하고 건조한 후 In-situ XRD 장비를 이용하여 공기분위기에서 상온부터 $1400^{\circ}C$까지 가열하면서 발생하는 결정구조 변화를 분석하였다. In-situ XRD 분석 결과 cubic 스핀넬 구조는 $900^{\circ}C$부터 존재하는 것을 확인할 수 있었으나, 온도가 $1300^{\circ}C$ 이상으로 올라갔을 때는 스핀넬 결정구조로부터 NiO의 상분리 현상이 발생하기 시작함을 관찰할 수 있었다. 이러한 NiO 상의 분리가 고온에서의 NTC 서미스터의 결정성 감소의 원인임을 알 수 있었으며, 제작된 NTC 서미스터의 표면을 FE-SEM을 이용하여 관찰하여 양품과 불량품의 차이를 분석하였다. This study was performed to investigate crystal structure of cubic spinel-type monophase oxide composed of the Mn-Co-Ni ternary system. Starting material was prepared by mixing Mn, Co, Ni oxides then evaporation to dryness. The XRD patterns were analyzed by in-situ XRD as increasing temperature from room temperature to $1400^{\circ}C$ in air atmosphere. The cubic spinel phase was existed in a temperature range from $900^{\circ}C$. However, separation of NiO phase was detected from $1300^{\circ}C$, which was the origin of deterioration in the crytallinity. The surface morphology of the manufactured NTC thermistors were analyzed by FE-SEM for comparison of good and bad samples.

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.

화학문헌(化學文獻)의 부분구조표시법(部分構造表示法)(1)

이정일,Lee, Jeong-Il 한국과학기술정보연구원 과학기술정보센터 1974 Journal of Information Science Theory and Practice Vol.7 No.1

발열의류로 인한 화재위험성 및 저온화상에 대한 분석 연구

이정일,Lee, Jeong-Il 한국재난정보학회 2018 한국재난정보학회 논문집 Vol.14 No.2

연구목적 : 본 연구는 최근 많이 이용하고 있는 발열조끼에 의한 저온화상과 화재위험성 도출을 목적으로 한다. 연구방법 : 사용전압보다 더 높은 전압에 발열조끼를 연결하는 실험을 실시하였다. 연구결과 : 재현실험한 결과 높은 저온화상과 발화위험성을 알 수 있었다. 또한 같은 전압을 인가했을 때 상대적으로 열선의 저항값이 더 낮은 발열조끼 제품이 더 높은 온도에 도달한다는 것도 알 수 있었다. 결론 : 발열조끼는 온도조절장치나 타이머가 존재하지 않아 온도가 급격히 올라갈 경우 안전장치가 없다는 문제점이 있다. 따라서 화재나 저온화상의 위험성을 줄이기 위해서는 열선의 최소저항값 기준을 설정하고, 낮은 저항값을 가지는 열선 사용의 규제가 필요하다. Purpose : This study aims to seek out the risk of low-temperature burns and fire. Method : Hot vests are connected by higher voltage than walking voltage. Results : Accordingly, the possibility of low-temperature burns and fire was proved high. It was also shown that hot vests with relatively lower resistance on heat rays reached a higher temperature as the same voltage was applied. Conclusion : There are some problems with hot vests because they do not have any safety devices like a thermostat or a timer to prevent temperature increasing rapidly. For the purpose of reducing the risk of low-temperature burns and fire, setting the standard of the minimum resistance temperature and regulating the use of heat rays with lower resistance are necessary.

구리 합금 슬래그를 혼합한 시멘트 모르타르의 특성

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.