기판온도가 전자비임으로 제작된 텅스턴 산화물박막의 화학적 안정성에 미치는 영향

이길동(Kil Dong Lee) 한국진공학회(ASCT) 1996 Applied Science and Convergence Technology Vol.5 No.4

전기적 착색 텅스텐 산화물박막을 전자비임 증착으로 제작하였으며 제작된 막의 화학적 안정성의 기판온도 의존성을 연구하였다. 실험결과로부터, 제작된 시료의 광학적 특성과 화학적 안정성은 강하게 기판온도에 의존하였다. 기판온도 80℃에서 제작된 WO₃막은 유기성 용액 0.6몰 LiCIO₄속에서 착색과 탈색이 반복되어도 가장 안정하였다. Electrochromic WO₃ films were prepared by using an electron -beam deposition method. The dependence of the chemical stability of film on the substrate temperature was studied. From the experimental results, The optical property and chemical stability of as-deposited films strongly depended on the substrate temperature. The WO₃ film prepared at a substrate temperature of 80℃ was found to be the most stable when subjected to repeated coloring and bleaching cycles in an organic 0.6M LiCIO₄ solution.

니켈산화물 박막의 전기적착색특성

이길동(Kil Dong Lee) 한국진공학회(ASCT) 1999 Applied Science and Convergence Technology Vol.8 No.2

니켈산화물 박막은 전자비임증착법에 의해 제작되었다. 막의 내구성조사를 위한 착색과 탈색은 순환 전압전류법으로 KOH 전해질속에서 반복 수행되었으며 퇴화된 막의 투과율은 가시광선 분광기로 측정하였다. X선 광전자분광에 의한 분석 결과 막의 낱알 내부보다 낱알표면에 많은 산소가 포함되어 있었다. 착색된 막의 열린회로기억성은 KOH전해질 속에서 약 400시간 정도였다. 막의 자체방전율은 충분히 산화시켜서 파장 550 ㎚에서 투과율을 측정하여 평가하였으며 자체방전율은 시간에 따라 다항식형으로 증가하고 400시간 후에 완전히 탈색되었다. KOH 전해질속에서 사이클이 반복된 막의 표면낱알의 형태는 변하였으며 3×10^(-4) mbar에서 제작된 시료가 막의 안정성이 좋았다. 전기적착색성을 설명하기 위해 띠이론이 논의되었다. Nickel oxide films were prepard by using the electron beam evaporation technique. Coloring and bleaching experiments for cyclic durability were repeated in KOH electrolyte by cyclic voltammetry. Visible spectrophotometry was used to assess the stability of the transmittance in the degraded films. X-ray photoelectron spectroscopy results showed that the grain surface are oxygen-rich compared to the grain interiors in a NiO film. Open circuit memory of colored films is about 400 hours in 1N KOH. The rate of self discharge was evaluated by measuring the transmittance at 550 ㎚ of a fully oxidized NiO film. The rate of self discharge was increased polynomially with time and the film is nearly bleached after about 400 hours. It was also found that the degraded film by repeated cycles in the KOH solution changed the grain shape of film surface. The film prepared under a vacuum pressure of 3×10^(-4) mbar was found to be rather stable when subjected to the repeated coloring and bleaching cycles in KOH electrolyte. Band theory applied to explain the electrochromic mechanism was discussed.

전기적 착색 니켈산화물 박막의 특성과 안정성

이길동(Kil Dong Lee) 한국진공학회(ASCT) 2000 Applied Science and Convergence Technology Vol.9 No.1

니켈산화물 박막을 전자살증착법으로 제작하고 제작조건 특히 기판온도가 막의 안정성에 미치는 영향을 연구하였다. 제작된 시료의 광학적 특성과 안정성은 강하게 기판온도에 의존하였으며 기판온도 l50~200℃에서 제작된 NiO막은 0.5몰 KOH 용액속에서 -0.6~+0.8 V 사이의 5000사이클 후 에도 안정하였다. 5000사이클 후 가창 우수한 전기적 착색인자는 기판온도 150℃에서 제작된 시료에서 얻어졌으며 착색인자는 착색효율 CE=-0.049 ㎠/mC, 광학적 밀도변화 △OD=0.88, 막에 주입된 전하 Q_(in)=-18.11 mC/㎠ 그리고 막속에 남아있는 전하 Q_(left)=l4.8 mC/㎠였다. Electrochromic NiO films were prepared by using an electron-beam deposition method. The influence of the preparation conditions, especially the substrate temperature, on the electrochemical stability of film was investigated. The optical properties and stability of as-deposited films strongly depended on the substrate temperature during deposition. The NiO film prepared at a substrate temperature of 150~200℃ was found to be the stable when subjected to 5000cycles in a 0.5 M solution of KOH between -6.0 and +0.8 V. The best electrochromic parameters after 5000cycles were obtained for samples with substrate temperature of 150℃. The obtained electrochromic parameters are CE=-0.049(λ=550 ㎚), △OD=0.88(λ=550 ㎚)㎠/mC, Q_(in)=-18.11 mC/㎠ and Q_(left)=14.8 mC/㎠.

후방 십자인대의 경골 부착부의 편상골절에 대한 치험례

창길동(Chang-Kil Dong),이일상(Lee-Il Sang),권칠수(Kwon-Chill Soo),서광윤(Seo-Kwang Yoon) 대한정형외과학회 1978 대한정형외과학회지 Vol.13 No.4

흑색 코발트 태양 선택흡수막의 광학적특성과 구조

이길동(Lee,Kil-Dong) 한국태양에너지학회 2011 한국태양에너지학회 논문집 Vol.31 No.4

Black cobalt solar selective coatings were prepared by thermal oxidation of electroplated cobalt metal on copper and nickel substrates, The optical properties and structure of the black cobalt selective coating for solar energy utilizations were characterized by glow discharge spectrometry (GDS), ultraviolet-visible-near infrared (UV-VIS-NIR) spectrometer, atom force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS). The optical properties of optimum black cobalt selective coating prepared on copper substrate were a solar absorptance of 0.82 and a thermal emittance of 0.01. From the GDS depth profile analysis of these coatings, the concentration of cobalt particles near the interface was higher than at the surface, but oxygen concentration at the surface was higher than at the interface. These results suggest that the selective absorption was dominated by this chemical composition variation in the coating. The surface of this film exhibited morphology with root-mean-square (rms) roughness of about 144.3 ㎚. XPS measurements data showed that several phases of Co coexist (Co₃O₄, CoO) in the film.

졸겔 WO₃ 박막의 특성

이길동(Kil Dong Lee) 한국진공학회(ASCT) 2001 Applied Science and Convergence Technology Vol.10 No.1

WO₃ 박막은 졸겔방법으로 텅스텐 알코산화물 용액을 사용하여 마이크로 슬라이드유리와와 ITO 유리 기판위에 여러번 침적도포시켜 다층박막형으로 제작하였다. 첨적도포와 시료제조 공정인자가 박막의 구조, 광학적 및 전기화학적 특성에 미치는 영향이 연구되었다. 텅스텐 알코산화물 용액을 사용하여 증착속도를 0.005m s-¹ 로 하여 제작된 박막은 매우 균일하였으나 증착속도를 0.007m s-¹ 보다 크게 하여 제작된 시료의 두께는 상당한 변화를 보였다. 전기화학적 착색 실험결과 박막은 200℃보다 낮은 온도에서 열처리된 시료는 쉽게 착색이 되었다. 라더포드 후방산란법에 의해 착색된 시료에서의 K^+ 이온들은 막 속에 균일하게 분포되어 있었다. WO₃ films were multicoated on the microscope slide glass and ITO-coated glass using a tungsten alkoxide type solution by the sol-gel deposition process. The effect of dipping and processing parameters on the structure, optical and electrochemical properties of the film were also investigated. Coating using alkoxide solution was very uniformed for low dipping speed of 0.005 m/s, but thickness variations across the sample became apparent for dipping speeds greater than 0.007 m/s. Electrochemical coloration experiments showed that films fired at lower temperatures color more easily than film fired to >200℃. Rutherford backscattering spectroscopy studies revealed that K^+ ions were uniformly distributed throughout the WO₃ layer in the colored sample.

저가 Batch 형 온수 급탕시스템의 실험적 연구

이길동(Kil-Dong Lee),윤환기(Hwan-Gi Yoon),강용혁(Yong-Heack Kang),이내준(Rae-Joon Lee),오정무(P. Chungmoo Auh) 한국태양에너지학회 1985 한국태양에너지학회 학술대회논문집 Vol.- No.-

고온용 태양 선택흡수막의 제작

이길동(Lee Kil-Dong) 한국태양에너지학회 2008 한국태양에너지학회 논문집 Vol.28 No.1

Zr-O (Zr-ZrO2) cermets solar selective coatings with a double cermets layer film structure were prepared using a DC (direct current) magnetron sputtering method. The typical film structure from surface to bottom substrate were an Al₂O₃ anti-reflection layer on a double Zr-O cermets layer on an Al metal infrared reflection layer. Optical properties of optimized Zr-O cermets solar selective coating had an absorptance of α=0.95 and thermal emittance of ε=0.10 (100 ℃). The absorbing layer of Zr-O cermets coatings on glass and silicon substrate was identified as being amorphous by using XRD. AFM showed that Zr-O cermets layers were very smooth and their surface roughness were approximately 0.1∼0.2 ㎚. The chemical analysis of the cermets coatings were determined by using XPS. Chemical shift of photoelectron binding energy was occurred due to the change of Zr-O cermets coating structure deposited with increase in oxygen flow rate. The result of thermal stability test showed that the Zr-O cermets solar selective coating was stable for use at temperature below 350 ℃.

위장관 출혈을 동반한 원발성 양성 소장 간질종양 1 예

서길동(Kil Dong Seo),김명준(Myung Jun Kim),김수형(Su Hyung Kim),김일두(Il Doo Kim),허정호(Jeong Ho Heo),이채원(Chae Won Lee),박상제(Sang Je Park),김상현(Sang Hyun Kim),조성락(Sung Rak Cho) 대한소화기학회 2001 대한소화기학회지 Vol.38 No.5

The origin and clinical behavior of gastrointestinal stromal tumors (GISTs) have been a source of recent speculation and controversy. GIST has been applied to mesenchymal tumors that represent neither their typical leiomyomas nor schwannomas. GISTs are spindle cell tumors occurring mainly in adults with 5-year survivals in 50-56% and 10-year survivals in 35-43%. Because of its indolent and slow-growing nature, it is difficult to define it as malignancy. We report a case of benign stromal tumor of the proximal jejunum presenting melena in a 32-year-old male. Small bowel series and computed tomography of the abdomen revealed submucosal tumor in the proximal jejunum. Histological studies on the surgical resection specimen revealed a gastrointestinal stromal tumor of a benign type with no evidence of metastasis. The patient was treated with local excision of the tumor and is now in a favorable state. (Korean J Gastroenterol 2001;38:371-375)

장애유아 통합교육의 효과적인 운영 방안

이길동(Lee Kil-Dong) 한국열린유아교육학회 2010 열린유아교육연구 Vol.15 No.4

본 연구는 효과적인 장애유아 통합교육을 방안을 모색하기 위하여 독일의 모범적인 장애유아 통합교육 프로그램의 사례를 조사하여 소개하고 우리나라에 적용 가능한 시사점을 찾는 것을 목적으로 수행되었다. 독일의 사례에서 다음과 같은 시사점을 찾을수 있다. 첫째, 정부의 지원 아래 모델 프로그램 개발에 충분한 사전 준비와 현장적 용기간을 장기간 계획하고 연구한 점이다. 둘째, 개발된 모델프로그램을 여러 곳의 유아교육기관에 동시에 실시하여 프로그램의 보편화를 추구한 점이다. 셋째, 교사 대 유아비율을 적절하게 편성하여 교육의 질을 높인 점이다. 넷째, 교육뿐만이 아니라 치료가 지원되었고 교사들과 치료사들과의 정기적인 교류를 통한 협력적인 관계가 유지되었다. 다섯째, 부모들의 참여활동을 촉진하고, 유치원과 부모의 협력적 관계를 발전시킨 점이다. The purpose of this study was to explore management methods for disabled preschooler integrated education. Eitensheim kindergarten integrated education program was analyzed and we found good guides for integrated education. First, a Model program was developed by government subsidy and was studied for a long period to apply it to kindergarten programs. Second, the developed model program was applied to several kindergartens at the same time and the program sought generalization. Third, An appropriate child to teacher ratio increased the quality of education. Fourth, children received not only education but therapies by the integrated education program. Teachers and therapists preserved cooperative relationship by regular exchanges. Fifth, The program promoted participation of parents and developed cooperative kindergartenparents relation.