Effects of hydrogen plasma treatment on SnO2:F substrates for amorphous Si thin film solar cells

Min-Seung Choi,Young-Ju Lee,Jung-Dae Kwon,Yongsoo Jeong,Ju-Yun Park,강용철,Pung Keun Song,Dong-Ho Kim 한국물리학회 2013 Current Applied Physics Vol.13 No.8

We investigated the effects of hydrogen plasma treatment on the physical and electrical properties of fluorine-doped tin oxide (FTO) films used for amorphous silicon (a-Si) thin film solar cells. A slight increase in carrier concentration by the hydrogen doping effect was observed for the FTO film exposed to the hydrogen plasma for 5 min. For further exposure to the plasma, the chemical reduction became prominent and resulted in deterioration of the electrical and optical properties of the film. XPS analysis revealed that the chemical reduction of SnO2 to Sn metallic state occurs on the surface region. It was found that the defects formed by hydrogen plasma act as recombination centers at the interface between FTO electrode and p-layer of a-Si solar cells. This phenomenon resulted in the deterioration of the cell performance. The averaged conversion efficiency (6.82%) of the cells on pristine FTO hydrogen substrate was decreased to 5.81% for the cells on FTO treated for 5 min, which is mainly attributed to the decrease in short-circuit current density.

저농도 이산화탄소 포집용 흡착제 개발 및 최적조건에 관한 연구

이주열 ( Ju Yeol Lee ),박덕신 ( Duck Shin Park ),조영민 ( Young Min Cho ),권순박 ( Soon Park Kwon ),황윤호 ( Yoon Ho Hwang ),송형진 ( Hyung Jin Song ),이상봉 ( Sang Bong Lee ) 한국유화학회 2012 한국응용과학기술학회지 Vol.29 No.1

본 논문은 다양한 시설내에 적은 농도의 CO2 제거를 위한 선택적 CO2 흡수능력을 향상시킨 흡착제의 효율평가에 관한 것이다. 직경 4mm의 구형 흡착제는 시판용 제올라이트에 첨가제, 물, 바인더, LiOH를 섞어 제조하였다. 칼럼테스트에서 400분 이내에 90% 이상의 CO2흡착효율을 나타내었고, 흡착필터모듈 흡착능력을 평가하기 위해 회분식과 연속식타입의 챔버테스트가 시행되었다. 회분식테스트에서 30분 이내에 약 92%의 CO2가 제거되는 것을 확인하였다. 연속식테스트에서 30분 이내 70%의 CO2가 제거효율을 보였으며, 2,500ppm 이상의 CO2가 제거되는 것을 확인하였다. 재현성테스트를 수차례 수행한 결과 15일동안 1,000ppm 이상의 CO2가 연속적으로 제거됨을 보였다. TGA 분석법을 이용한 흡착량 분석에서 흡착제 g당 5.0mmol의 CO2를 흡착하는 것으로 나타났다. 본 연구에서 개발된 흡착제는 상온에서 저농도 CO2 실내환경에 적용가능한 것으로 판단된다. In this study, CO2 adsorbent was developed for removing low concentration of CO2 in multiple-use facilities. The efficiency of the adsorbent which was improved selective CO2 adsorption capabilities was evaluated. The pellet type adsorbent was modified from a commercial zeolite with mixing LiOH, binder, additives, and H2O. Column tests showed over 90 % of CO2 was adsorbed within 400min. Chamber tests including batch and continuous types were performed for evaluating the adsorbent module. By batch tests, it was evaluated that about 92 % of CO2 was removed within 30 min. By continuous tests, 70% of CO2 was removed within 30 min. It was analyzed that over 2,500 ppm of CO2 was continuously removed as shown chamber tests. The reproducibility tests repeatedly performed for 15 days shows that over 1,000 ppm of CO2 was continuously removed. Adsorption capacity of the developed adsorbent was 5.0mmol CO2/g adsorbent which was analyzed by TGA. It was estimated that the modified adsorbent was applicable to low CO2 concentration and low temperature of indoor environment.

물 전해에서 초음파에 의한 과전압 저감에 관한 연구

宋旼根,孫承佑,朱恩選 경상대학교 생산기술연구소 2002 工學硏究院論文集 Vol.2 No.-

The production of hydrogen fuel depends basically on the water electrolysis. The study on the overpotential which activates the hydrogen production is the core to elevate the hydrogen production efficiency on the principle. Characteristics according to the macroscopic effects of the ultrasonic are extracted to elevate the hydrogen production efficiency through measuring the hydrogen production quantity by using the electrolytic cell of the Hoffmann manner. For the above, several devices for measuring by new ideas are developed and applied. Characteristics on the overpotential decrease and the Debye phenomena are observed through the micro reaction by ultrasonic in electrolytic cell. For the above, the electrochemical analyzer, i.e., BAS is applied. Experiments with ultrasonic forcing into 4 kinds of solution such as city water, city water plus nitrogen, distilled water, and distilled water plus nitrogen are carried out. Various methods of ultrasonic forcing such as the improving method, the direct vibrating method, the indirect vibrating method, and etc., are applied as the transmissible method of ultrasonic force. The data base is constructed to design a new ultrasonic modern electrolyzer by using all the above data.

특수교육지원센터 치료지원서비스에 대한 견해 : - 작업치료 서비스를 받는 보호자를 중심으로 -

송민옥,이성자,김훈주 대한감각통합치료학회 2010 대한감각통합치료학회지 Vol.8 No.1

목적 : 본 연구에서는 특수교육지원센터에서 시행되는 치료지원서비스의 인식, 목적, 특징 및 개선방안을 살펴봄으 로써 치료지원서비스의 전반적 실태를 파악하고 이를 통해 최적의 치료지원서비스를 제공하기 위한 기초자료로 제시하고자 한다. 연구 방법 : 현재 특수교육지원센터에서 치료지원서비스를 받고 있는 치료지원대상 아동의 보호자를 대상으로 개별 인터뷰가 진행되었다. 인터뷰는 평균 40분이 소요되었으며, 모든 인터뷰는 녹취되었다. 결과 : 치료지원서비스에 대한 근본적인 인식이 부족하였고, 치료영역의 전문가가 치료를 담당함으로 인하여 치료사에 대한 신뢰도가 높은 것으로 조사되었다. 또한 치료실의 시설 및 교재교구의 다양성으로 인해 질적으로 높은 치료를 받는다고 생각하고 있었으며 모든 연구대상자는 무상교육을 치료지원서비스의 특징으로 꼽았다. 결론 : 작업치료사가 특수교육지원센터에서 치료지원서비스 전문가로 자리 매김하기 위해서 많은 노력과 연구 및 대외적인 홍보가 필요하다. Objective : The purpose of this study is to provide practical guidelines for the better performance of the Occupational therapy services(OT services) in the Supporting Center for Special Education. The study is based upon the quality and satisfaction of the OT services, measured by interviewing parents whose children have taken the services provided by Ulsan Kang-Nam Supporting Center for Special Education. Methods : Five parents for the children having OT services since March, 2010 in the Kang-Nam Supporting Center were interviewed individually. The interview per each person took thirty to fifty minutes and was all audio-recorded. Results : The satisfaction of the qualification for the OT therapists working at the Kang-Nam Supporting Center was high. The quality for treatment facilities and the variety for treatment materials met the expectation for OT to be well-performed. The free OT treatment system was the one of significant features for the OT services provided by the Kang-Nam Supporting Center. However, the perception of the interviewed parents for the OT was very low.

연마방법에 따른 탄성의치의 표면거칠기와 Candida albicans의 부착율 변화

오주원,서재민,안승근,박주미,강철균,송광엽 대한치과보철학회 2012 대한치과보철학회지 Vol.50 No.2

연구 목적: 본 연구는 탄성의치 제작 시 주로 사용되는 polyamide를 수종의 연마방법을 사용하여 처리 후 Candida albicans의 부착정도와 표면거칠기를 비교하고자 하였다. 연구 재료 및 방법: 25×15×2 mm 크기의 polyamide 시편을 4군으로 나누어 연마재를 사용하여 기공용 lathe 연마하는 방법(기공실내 연마방법)과 각기 다른 2종의 실리콘 포인트로 진료실내 연마하는 방법, 그리고 실리콘포인트 연마 후 pumice로 연마하는 방법으로 처리하였다. C. albicans의 부착성을 평가하기 위해 5×106 CFU/ml의 C. albicans 현탁액에 시편을 2시간 동안 침적하였고 5회 수세처리 후 한천배지에서 배양하였다. 그리고 주사전자 현미경(JSM-5900, JEOL LTd., Tokyo, Japan) 촬영을 시행하였다. Profilometer (Surf-pak; Kawasaki, Japan)를 이용하여 표면거칠기를 측정하였고 통계처리를 위하여 SPSS 18.0 프로그램을 사용하였다. 일원변량분석으로 비교 분석하였고 사후검증은 C. albicans의 부착성 검증을 위해 Scheffe test를 시행하였으며 표면조도검증을 위해 Tamhane’s T2 test를 시행하였다(α=.01). 결과: 최대 거칠기 값을 보인 군은 2단계의 연마용 버를 사용한 것으로 0.32 ㎛±0.10 값을 나타냈으며, 가장 낮은 거칠기 값을 보인 것은 tungsten carbide를 사용하지 않고 기공용 lathe로만 연마를 한 군으로 0.02 ㎛±0.00의 거칠기 값을 나타냈다. C. albicans 부착 실험에서는 기공용 lathe만을 이용한 연마방법이 가장 적은 부착수를 보였으며 다른 세 군과 유의한 차이가 발견되었다(P<.01). 결론: 표면거칠기 및 미생물 부착능 실험 결과 기공실 연마만을 시행한 경우 유의하게 낮은 거칠기 값과 부착율을 보였다. Pumice로 추가 연마한 군은 진료실연마를 시행한 군에 비해 낮은 거칠기 값을 보였으나 C. albicans 부착에 있어서는 유의한 차이를 보이지 않았다(P>.01). Purpose: The purpose of this study was to compare the effect of 3 chairside polishing methods and laboratory polishing methods on surface roughness and C. albicans adhesion of polyamide denture base. Materials and methods: Using contact profilometer, the surface of polyamide specimens (25×15×2 mm) was studied after conventional polishing without finishing and after chiarside polishing with 2 chiarside polishing kits and chairside-pumice polishing following finishing with tungsten carbide bur. To evaluate the adhesion of C. albicans, C. albicans suspension was overlayed on the test specimen. And the specimens were incubated for 2 hours. Imprint culture method was achieved and counted the colony on the agar plate. Polished polyamide were evaluated using a scanning electron microscope. The statistics were conducted using one-way ANOVA and in case of difference, Scheffe test and Tamhane’s T2 test were used. Results: Surface roughness (Ra) of surfaces polished with 2 chairside polishing kits had higher than conventional polishing and pumice polishing. The highest roughness value was 0.32 ± 0.10 ㎛, and the lowest was 0.02 ± 0.00 ㎛. The adhesion of C. albicans on the specimens polished with chairside polishing group and pumice polishing group were increased than conventional polishing group (P<.01). Conclusion: Conventional laboratory polishing was found to produce the smoothest surface and the lowest adhesion of C. albicans. Two groups polished with Chairside polishing kits were similar with respect to surface roughness. Surface of the specimen polished with pumice is significantly smoother than 2 chairside polishing groups, but the result of C. albicans adhesion is that group polished with pumice was similar with 2 chairside polishing groups (P>.01).

미만성 경화 아형 갑상선 유두암 1예

최정민,이송주,김부경,최영식,박요한,김정훈,허방 고신대학교 의과대학 2009 고신대학교 의과대학 학술지 Vol.24 No.1

The diffuse sclerosing variant (DSV) is a rare malignant tumour that accounts for 0.7-5.3% of all papillary thyroid cancers. DSV tends to occur at a younger age and has a higher incidence of cervical lymph node metastases, compared with papillary thyroid carcinoma. A 62-year-old female patient diagnosed thyroid nodule with diffuse and mild increased 18F-deoxy-glucose (FDG) on FDG positron emission tomography (PET)-computed tomogram (CT) scan. The ultrasound images showed typical findings of DSV such as diffusely enlarged thyroid lobes and diffusely scattered microcalcification. We performed this patient ultrasonography guided fine needle aspiration and cytologic analysis revealed papillary carcinoma. Total thyroidectomy with central compartment node dissection and lateral lymph node dissection was performed and finally diagnosed DVS. The authors report this case with literature review.

단클론성 IgG 침착을 동반한 증식성 사구체 신염 1예

차정민,정덕은,송주흥,안선호 圓光大學校 醫科學硏究所 2008 圓光醫科學 Vol.23 No.2

Proliferative glomerulonephritis with monoclonal IgG deposits is a novel phenotype of glomerular injury with the diagnostic criteria of (1) the presence of glomerular monoclonal IgG deposits restricted to a single IgG subclass and a single light chain isotype, associated with endocapillary proliferative, membranoproliferative, or membranous features; (2) the presence of granular("immune complex type") deposits by electron microscopy; and (3) the absence of clinical and laboratory evidence of cryoglobulinemia. We report a case of 65-year-old man with generalized edema who was diagnosed as proliferative glomerulonephritis with monoclonal IgG deposits by renal biopsy.

韓國産 景天科 植物에 關한 本草學的 考察

朴柱性,新民敎,宋昊埈 圓光大學校 韓醫學硏究所 1994 원광한의학 Vol.4 No.1

For the purpose of developing Korean Herbalogy with the plants of Crassulacea which grow wild and is planted in Korea, the these and writings in hirbalogy, from literature of successive generations, have been throughly investigative and the results obtained were as follows; 1. There were totaled to 9 genera and 55 species in Korea and among them medicinal plants are 5 genera, 17species. Some 31% in total but the number of species may be added because of the similiar plants. 2. According to sum of 55 species in Crassulacea family, they were classified into Sekum genera 33, Orastachys 8, Rhodiola genera 4, Bryophyllum genera 3 etc. 3. According to the oriental names which can be used for medical purpose, the medicinal plants belonging to the Crassulacea family were classified as Herba 10, Radix 4, Folium 3, Flos 1. Thus it was noticed that Herba was the main kind. 4. According to nature of medicinal plants, they were classified into cold, cool, 6: balance, 3 ; warmth, 1. Thus it was noticed that cold, cool is the main in nature of medicinal plants. 5. According to properties and principal curative action, they were classified into drugs to remove dramatic swelling 9 drugs for hemostatis 7, to remove toxic heat with febri fugal and detoxicant drugs 6. From this result, it was revealed that the plants for medical purpose in Crassulacea was 31% of the whole, in which Herba was mostly abundunt. It is considered that many experiments and clinical apporaches must be continued to use Crassulacea plants widely.

일부농촌지역의 농약사용실태 및 농약중독 요인 조사

이경민,송주희,장재혁,심수정,강양화,안재경,이숭호,박미영,정문호 대한보건협회 2002 대한보건연구 Vol.28 No.4

Object The usage of agricultural chemical is on the increasing. Use of pesticides has increased agricultural production. However, negative externalities from such use have increased too. Pesticide poisoning is a major public problem. The purpose if this study is to find out the relationship between keeping the safety rules or protective equipments or attending safety education or dose of pesticides use , and poisoning experience. Methods For Gu, H.M. and Pack, S.G. study , we obtained questionnaire data concerning pesticides poisoming. A person interviews on 203 were conducted in two villages in Sinmeari and woulbonri Chunchun , Kangwon province, July 2002. Result 1. 144 people(70.9%) have sprayed pesticides and the rata of experiences of pesticide poisoning was 26% among 144. Spraying time of pesticides was 1-2 hours in 63.9% of farmers. Rate of using the protective equipment was 25.7% (protective clothes), 49.3% (Mask), 48.6 (Gloves), 7.0 (Protective glasses), 64.6% (boots) respectively. 2. Chi-square and multiple logistic regression analysis showed that Duration of spraying per day (<2hr) and using of mask(protective equipment)are significantly association with poisoning experience.(x^2=5.2684 p=0.0217, CI=0.140-0.5853 OR=0.346 p=0.0211 respectively). But no association between poisoning experience and keeping safety rule, attending of safety education. 3. Spraying pesticides. Duration of spraying pesticides, reading manuals and no spraying at fatigue (keeping safety rule) are significantly association with symptom experience(x^2=14.0621 p=0.0002, x^2=7.0639 p=0.0079, CI01.395-10.950 OR=3.908 p=0.0095, CI=0.101-0.726 OR=0.271 0.0094 respectively). But no association between symptom experience and protective equipments, attending of safety education.

Triple antibiotics와 관련한 치아 변색의 예방

김보나,송민주,신수정,박정원 大韓齒科保存學會 2012 Restorative Dentistry & Endodontics Vol.37 No.2

Regenerative endodontics has a potential to heal a partially neecrotic pulp, which can be beneficial for the continued root development and strengthening of immature teeth. For this purpose, triple antibiotic mixture of ciprofloxacin, metronidazole, and minocycline was recommended as intracanal medicament in an attempt to disinfect the root canal system for revascularization of a tooth with a necrotic pulp. However, discoloration of the tooth was reported after applying this. This case shows the idea for preventing the tooth discoloration using a delivery syringe (SW-0-01, Shinwoo dental) to avoid the contact between the clinical crown and the antibiotics.