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.

생체분해성 안과제형의 안구내흡수정도와 안독성

민병무,김용백,박근성,송규상,양준묵,이성복,조항진,길숙종,김승영,김학용 충남대학교 의과대학 지역사회의학연구소 1998 충남의대잡지 Vol.25 No.1

An improved retinal tack can be used to fix the retina in complicated retinal detachment and proliferative vitreoretinopathy. We used the retinal tack made by biodegradable polyglycolic acid, polylactic acid and copolymers. The tacks with polyglycolic acid were placed in the retina the right eyes of 10 rabbits as group 1, with polylactic-polyglycolic acid copolymers as group 2 in each left eyes. We examined the absorption rates and degree of intraocular inflammation at 1 day, 1, 2, 4, and 8 weeks and compared both eyes. The tacks were absorbed with time in both eyes, but more rapid in copolymers. And there was no inflammation in both eyes. Now, this study will be a base on the drug delivery system in intraocular pharmacological and surgical management.

생체분해성 고분자를 이용한 사시수술용 제형개발 및 효용성에 대한 연구

민병무,김용백,김승영,김창식,박근성,길숙종,조항진,이성복,노승무,송규상,강대영,조준식,양준묵,정경수,최선웅,이진호,김학용,인현빈 충남대학교 의과대학 지역사회의학연구소 1998 충남의대잡지 Vol.25 No.1

A new device, muscle clamping system was developed to facilitate exact quatifying technique A strabismus surgery, and reduce the risk of complications. The device is composed of a lower fixing body with three jaws and an upper supporting body. They are used to clip an extraocular muscle and fix it to the sclera with a single bite. Superior rectus recession on 16 rabbit eyes were performed with this new device. Conjunctival injection, muscle adhesion strength, and light microscopic findings were examined at 1, 2, 4 and 8 weeks postoperatively. The Conjunctival injection were minimal, adhesion power ranged from 420 to 600 gram gravity, which is sufficient in withstand the normal pull of human extraocular muscle. In microscopic exam, some Inflammatory cells and fibrosis were found. The new device was technically easy, fast, and accurate, so it may be useful in stabismus surgery.

농촌노인의 우울에 미치는 영향

송민선,김수근,김남초 노인간호학회 2010 노인간호학회지 Vol.12 No.1

Purpose: The purposes of this study were to investigate the degree of perceived health status, depression and the number of chronic diseases among rural elders and to identify factors related to depression in this population. Methods: We surveyed 1,014 elderly people using structured questionnaires. Data were analyzed using descriptive statistics, t-test, ANOVA, Pearson Correlation Coefficient and multiple regression using the SAS program (version 9.1). Results: There were significant differences in perceived health status according to gender (p<.001), education level (p<.001), medical support (p=.045), alcohol consumption (p<.001), number of chronic diseases (p<.001), and stage of exercise behavior change (p=.042). There were significant differences in depression score according to religion (p=.049), education level (p=.008), smoking status (p=.016), number of chronic diseases (p=.008) and stage of exercise behavior change (p<.001). Depression was negatively related to perceived health status and positively related to number of chronic diseases. Significant factors influencing depression were age, smoking status, stage of exercise behavior change, number of chronic diseases, and perceived health status. Conclusion: Multiple factors are associated with depression among rural elders. Findings of this study indicate the importance of considering chronic disease and perceived health status when planning programs to prevent depression.

대형 충격해머를 이용한 구조물 동특성 실험

송민석,정현호,전종균 선문대학교 2001 공학계열 논총 Vol.4 No.-

본 논문에서는 대형 구조물 내의 진동원인 공조기, 펌프 등을 설치, 가동시 구조물의 동적 응답을 예측하고 건물 구조개선 방안을 제시하는데 목적을 두고 있다. 구조물에 대한 동특성 해석은 해석적인 방법과 실험적인 방법으로 이루어지고 있다. 두 가지 방법 중 본 논문에서는 실험적인 방법을 통해서 구조물 동특성 해석을 시도해 보았다. 자체 제작한 대형 충격 해머(Large Impact Hammer)를 이용해서 구조물 바닥부분에 충격을 가진하여 물체에 작용하는 힘과 이로 인하여 발생되는 진동을 각각의 센서에 의해 측정, 분석하여 구조물의 모드형상을 확인하고 고유주파수를 측정하였다. 해석결과에서는 대형 충격 해머를 이용하여 대형 구조물의 동특성 테스트가 가능할 것이라는 것도 예상할 수 있었고, 임의의 진동원 설비가 설치되어 있는 구역에서 구조물의 동특성을 알고 진동원 가동시 발생하는 진동레벨을 측정하여 실험적으로 구하면 임의의 진동원 설비에서 발생하는 동하중이 산출 가능함을 알 수 있었다. 역으로 구조물의 동특성과 진동원의 동하중을 알면 구조물에 발생하는 진동레벨을 예측할 수 있음을 확인하였다. This paper predicted dynamic responses of structures and presented the solution of structural improvements when vibration sources(pump, motor etc.) were activated in structures. The analyses for the dynamic characteristics are the experimental method and theoretical analysis. This study used the experimental method. The mode shapes and natural frequencies are obtained by large impact hammer. It is possible to test the dynamic characteristics of structures using impact hammer. If it is possible to measure the vibration level when vibration sources were operated, it would be possible to compute dynamic weight. On the other hand, the vibration level could be calculated if dynamic weight can be measured.

원발성 조기 위 소세포암

송근영,강길,박정희,김경종,민영돈,박치영,임성철 朝鮮大學校 附設 醫學硏究所 2002 The Medical Journal of Chosun University Vol.27 No.2

Gastric small cell carcinoma(SCC) is defined as poorly-differentiated neuroendocrine tumor of the stomach, and their morphologic and biologic features arc similar to those of the lung. It is known that this tumor has poor prognosis even in early pathologic stage, It acounts for only 3% of all gastrointestinal SCC. that has been reported only 33 cases outside and 6 cases inside of the comitiy. Most of these reports are related to advanced gastric SCC. as pathologic stage IIIb or IV. This report describes a case of early gastric SCC. pathologic stage Ib.

백서의 복강내에 투여한 Mitomycin-C-Polyglycolic acid 제형이 장기에 미치는 영향에 관한 연구

송규상,강대영,최정목,노승무,정경수,오정연,김진향,양준목,최선웅,이진호,조준식,민병무,김용백,김창식,박근성,김승영,김학용,인현빈 충남대학교 의과대학 지역사회의학연구소 1998 충남의대잡지 Vol.25 No.1

To evaluate the in-vivo effects of mitomycin-C-polyglycolic acid composite(MMC-PGA) the disk: shaped composite were implanted into the peritoneal cavity of the Sprague-Dawley rats. The pathologic changes were examined at various time points up to 12 weeks. Initially the soft tissue around the inserted disks showed capillary congestion at 3 days. Inflammatory infiltrates with foreign body giant cells appeared from the 2nd week and reached peak response at 6-8 weeks. These reaction diminished prominently at 12 weeks. No specific pathologic change was found in the liver, the kidneys, and the heart. The above results suggest that the MMC-PGA composite can serve as a new device for intraperitoneal chemotherapy of various types of cancers.

유방의 과립세포종양 1예: 증례보고

민인철, 유근수, 선우영, 윤효영, 송영진 충북대학교 의과대학 충북대학교 의학연구소 2013 忠北醫大學術誌 Vol.23 No.2

유방의 과립세포종양은 슈반세포에서 기원하는 아주 드문 질환이다. 대부분의 환자들은통증을동반 하 지 않는 경성의 유방 멍울을 주소로 내원하게 된다. 따라서 이학적 진찰상 유방암과의 감별이 필요하 다. 유방의 과립세포종양은 임상적으로 유방암과 매우 유사하지만, 98%에서 양성 소견을 보인다. 일 반적인 유방촬영술 및 유방초음파 상에서는 종양 특이적인 소견을 보이지 않으며, 오직 조직생검술을 통한 조직학적, 면연화학적 검사만이 병변을 확진 하는 방법이 된다. 51세 여자 환자가 유방에 만져 지는 멍울을 주소로 외래를 방문하였다. 이학적 검사 상, 좌측 중간외측 유방에 멍울이 만져졌으며, 대흉근 및 주변조직과 고착 되어있는 소견을 보였다. 유방단순촬영 상 좌외측 유방에 비대칭성이 보 였다. 유방 초음파상 1cm크기의 유방 뒤 지방층을 침범하는 종괴가 보였다. 중심 침 조직검사 상 유 방의 과립종양세포 소견을 보였으며, 조직 절제 생검으로 확진 하였다. 임상적으로 유방암과 많이 혼 돈되는 과립세포종양 1예를 보고하고자 한다.

Chinese hamster 난소세포에서 수용성 니켈에 의해 특징적으로 발현되는 유전인자들의 빠른 분석에 관한 연구

성근제,이상한,우기민,송호연,조만희 순천향의학연구소 2001 Journal of Soonchunhyang Medical Science Vol.7 No.2

니켈에 의한 암 발생기전 및 세포 독성기전을 이해하고 니켈에 의해 발현에 변화를 보이는 유전자들을 검출하기 위하여 니켈이 포함된 배지에서 배양된 Chinese hamster난소 세포부터 mRNA differential display 분석을 시행하였다. 본 연구에서는 동위원소나 DNA염기서열 분석용 젤을 사용하는 기존의 방법 대신에 훨씬 빠르고, 다루기 쉽고 안전성을 지닌 변형된 기법을 개발하여 적용하였다. 니켈에 의해 발현에 변화를 보이는 cDNA fragments들을 10% polyacrylamide mini젤상에서 분리 및 클로닝한 다음, DNA염기 서열 분석과 GenBank Blast search 프로그램을 이용하여 상동성 조사를 하였다. Reverse Northern blot을 이용하여 발현에 변화가 있는 cDNA들을 재확인한 결과, 검사된 19 cDNAs 들중 총 9종에서 발현의 변화를 보였으며, 이 중 3종은 니켈에 반응하여 발현에 증가를 보였고, 반면에 6종은 발현이 감소하였다.

발전기 운전조건을 고려한 지상 조상설비설치계획의 적정기준 수립

이송근,민석원 순천향대학교 부설 산업기술연구소 1999 순천향 산업기술연구소논문집 Vol.5 No.1

Nowadays cooperative operation of VAR compensation facilities such as shunt reactors, generators, etc is more necessary than ever before under light load condition because line charging capacity is becoming larger due to the expansion of under ground cable in urban area and the construction of 765kV transmission system. In order to accomplish optimal reactive power operation under light load condition without switching off any tranmission lines, proper investment plan of shunt reactors should be established with optimal criteria and methodology since differently adopted criiteria would result in different investment plan especially the amount of shunt reactors. This paper presents the optimal criteria and methodolgy for the shunt reactor planning and compare it with conventional criteria with the practical view point.