Pt계 촉매를 이용한 직접 개미산 연료전지의 특성 연구

유재근,이효송,김진용,김기호,이영우 충남대학교 공업교육연구소 2005 論文集 Vol.27 No.1

Direct Formic Acid Fuel Cells (DFAFCs) are potential alternative power sources for potable devices such as cellular phones, personal digital assistants (PDA) and laptop computers. In this study, we investigated the effect of the anode catalysts on the performance of direct formic acid fuel cell. We made the Pt-Pd catalysts using deposition method for the investigation of the fuel cell performance as a change of temperature and oxidant. Fuel cell with Pt-Pd anode catalyst showed the performance of 120 mW/㎠at room temperature. This result was much higher value than that of Pt-Ru catalyst which showed the best performance of commercial catalyst in our previous works. For this reason, we can conclude that the Pt-Pd catalyst is an excellent material for the oxidation of formic acid.

Silorane-based 복합레진의 색안정성에 관한 연구

손유진,현홍근,김영재,김정욱,이상훈,김종철,한세현,장기택 大韓小兒齒科學會 2010 大韓小兒齒科學會誌 Vol.37 No.1

본 연구의 목적은 silorane-based 복합레진의 색안정성을 기존의 methacrylate-based 복합레진과 비교하여 평가하는 것이다. Silorane-based 복합레진인 P90(3M ESPE, USA), methacrylate-based 복합레진인 Tetric Ceram(Ivoclar Vivadent, Liechtenstein), Z250, Z350(3M ESPE, USA)을 이용하여 시편을 제작하고, 증류수, 커피, 레드 와인, 카레 용액에 담가 1일, 3일, 7일, 14일, 21일, 28일 후 색 변화를 분광광도계로 측정하고 실험 전후의 색상차이(ΔE*_(ab))값을 산출하여 다음과 같은 결과를 얻었다. 1. 카레 용액 > 레드 와인 > 커피 > 증류수의 순으로 레진 시편의 변색이 크게 나타났다. 2. 네 가지 종류의 레진을 비교하였을 때, Z350 > Z250 > Tetric Ceram > P90의 순으로 변색이 크게 나타났다. 3. 카레 용액의 경우 네 종류의 레진 모두에서 침지 1일 이후 수용도 역치 이상(ΔE*_(a)b>3.3)의 변색이 나타났다. 4. 레드 와인의 경우 Z350, Z250, Tetric Ceram에서 침지 1일 이후, P90에서는 침지 28일 이후에 수용도 역치 이상의 변색이 나타났다. 5. 커피의 경우 Z350에서 침지 1일 이후, Z250에서 침지 3일 이후, Tetric Ceram에서 침지 7일 이후에 수용도 역치 이상의 변색이 나타났으나 P90에서는 침지 28일 이후에도 수용도 역치 이상의 변색이 나타나지 않았다. The objective of this study was to evaluate the color stability of new silorane-based composite resin compared with methacrylate-based composite resins after immersion in 3 staining solutions. One silorane-based composite(Filtek P90) and 3 methacrylate -based composites(Filtek Z250, Filtek Z350, Tetric Ceram) were evaluated. Twenty disk-shaped specimens(10×2mm) of each of 4 composite resins were prepared. The specimens were then divided into 4 groups of 5 specimens each and immersed in 3 staining solutions( coffee, red wine, curry solution) or distilled water(control) for 28-day test period. Color of the specimens was measured with a spectrophotometer(Color Eye 7000A) using CIE L*a*b* color space relative to CIE standard illuminant D65 at baseline, 1day, 3days, 7days, 14days, 21days and 28days after staining. The color differences( ΔE*_(ab)) were calculated. The results were obtained as follows ; 1. The mean color changes(ΔE*_(ab)) of the composites were greatest in curry solution, then red wine, coffee and distilled water, in decreasing order. 2. The mean color changes(ΔE*_(ab)) of the composites were greatest in Z350, Z250, Tetric Ceram and P90, in decreasing order.

農業用水에 對한 小考

黃龍鎭,李裕根 진주산업대학교 1982 論文集 Vol.20 No.-

This paper is the one with relation to the agricultural useful water, and then I inquired about the vestiges of the water supply constructs in order to control by the our ancestors. Total consumption water quantities were 1144.24mm as a result of investigated to the consumption water quantities in the rice farming. It is 149 hundred millions ㎥ that is necessary for our country now, therefore, we have need for more water than being. A devise of resolving to the problem belongs to de promoting of the water holding in the soil and the construction of multiple dam.

결핵성 육아종에서 Thioredoxin peroxidase-2 의 발현

박근호,유형륜,정영진,윤기중,한원철,유대열,문형배 圓光大學校 醫科學硏究所 1999 圓光醫科學 Vol.15 No.2

Background: Thioredoxin peroxidase(TPX) is a kind of recently discovered antioxidant enzyme which react as rapid hydrogen ion donor for the removal of hydroperoxide. The action and distribution of the TPX was poorly understood in the human diseases. This experiments were designed for the study about the distribution of the TPX in the chronic granulomatous inflammation and about the correlation between the expression of TPX and the site of inflammation, histological activities of tuberculous inflammation or existence of mycobacterium in the inflammatory foci. Methods: The immunohistochemical stains were performed for the localization of the TPX-2 in the epithelioid cells, giant cells and lymphocytes in the chronic granulomatous inflammation. The tissue sections were obtained from the paraffin blocks of the 54 cases of tuberculosis (lung 21 cases, lymph node 12 cases, bone and soft tissue 12 cases, kidney 9 cases; active 33 cases, inactive 21 cases by the histologic classification; presence of mycobacterium 15 cases, no mycobacterium 39 cases by PCR reaction). Results: The expression of TPX-2 was 16.7% in the giant cells, 27.8% in the epithelioid cells and 100% in the lymphocytes of tuberculous inflammations. The expression of TPX-2 in the giant cells and epithelioid cells of the tuberculosis were 28.6% and 57.1% of the pulmonary tuberculosis; 33.3% in each cells of the renal tuberculosis; 0% in each cells of the lymph node or bone and soft tissue tuberculosis. The expression of TPX-2 in the giant cells and epithelioid cells were 9.1% in each cells of the active tuberculosis and were 28.6% and 57.1% in each cells of the inactive tuberculosis by histologic classification. The expression of TPX-2 in the giant cells and epithelioid cells was 40% in each cells of tuberculosis which mycobacteria were detected and the expression of TPX-2 was 7.7% and 23.1% in each cells which mycobacteria were not detected by PCR reaction in the paraffin embedded tissue. Conclusions: The above results were summarized that the TPX-2 in the giant cells and epithelioid cells were more frequently expressed in the inactive tuberculosis than in the active tuberculosis. These results suggest that the TPX-2 is a kind of regulating or suppressing factors in the activity of the tuberculosis.

최근 8년간(2001-2008) 서울대학교치과병원 소아치과의 진료현황 및 수익분포 변화에 대한 조사

손유진,현홍근,김영재,김정욱,이상훈,김종철,한세현,장기택 大韓小兒齒科學會 2010 大韓小兒齒科學會誌 Vol.37 No.1

The practice pattern of pediatric dentistry in the university dental hospital has been changing for the last several decades, due to socioeconomic changes, developments in dental materials and increasing number of private pediatric dental clinics. The purpose of this study is to survey the changing patterns of pediatric dental treatment in the university dental hospital and to present the future direction for pediatric dentistry. Patient distribution and practice trends were reviewed based on the OCS (order communication system) records of the department of pediatric dentistry, Seoul National University Dental Hospital from 2001 to 2008. Results were as follows; 1. The number of patients increased up to 2005 and decreased in 2006, and has remained constant up to 2008. 2. The proportion of preventive and orthodontic treatment increased and the proportion of restorative and pulpal treatment decreased. 3. In restorative treatment, amalgam restoration decreased and resin restoration increased. 4. Frequency of sedation decreased in 2006, 2007 and increased in 2008. 5. Frequency of general anesthesia increased up to 2008. 소아치과 전문 지역 의원의 증가, 소아치과에 대한 보호자의 인식 변화, 치의학의 발전, 소아치과 진료 범주의 확대 등에 의해 최근 소아치과의 진료 양상이 크게 변화하고 있다. 이러한 변화 양상을 파악하고 앞으로의 대학병원 소아치과 및 소아치과 전문 지역 의원의 진료분담에 대한 방향성을 제시하고자 본 연구를 시행하였다. 2001년 1월 1일부터 2008년 12월 31일까지 서울대학교치과병원 소아치과에 내원한 모든 초진 및 재진 환자를 대상으로, 서울대학교치과병원 종합의료정보시스템(OCS)을 통하여 1년간의 외래환자집계 및 수가코드별 진료 행위 건수 및 수익 분포를 조사하여 다음과 같은 결과를 얻었다. 1. 내원환자의 수는 2001년부터 2005년까지 대체로 증가하다 2006년에 감소하였으며 그 이후에는 2006년도와 별다른 변화가 없었다. 2. 2001년에는 예방치료가 6.84%, 수복치료가 49.96%, 치수치료가 9.64%, 외과치료가 10.78%, 교정치료가 22.78%를 차지하였으나, 2008년에는 예방치료가 15.40%, 수복치료가 28.97%, 치수치료가 3.28%, 외과치료가 14.83%, 교정치료가 37.52%를 차지하여 수복치료와 치수치료의 비율은 감소하고 예방치료와 교정치료는 증가하였다. 3. 수복치료의 비율에 있어서 아말감과 글라스 아이오노머 수복 및 기성금관수복의 비율은 감소하였고, 레진의 비율은 증가하였다. 4. 진정요법하 치과치료는 2005년까지 증가하다 2006년, 2007년에는 감소하였고, 2008년에 다시 증가하였다. 5. 전신마취하 치과치료는 2001년부터 2008년까지 꾸준히 증가하였다.

응급실에 내원한 약물중독환자의 지역별 비교분석

임근우,박일영,유승진,나병호,오동렬,전해명,황주일,김세경 대한응급의학회 1995 대한응급의학회지 Vol.6 No.1

We reviewed retrospectively 230 patients who came to emergency room of Kang Nam St. Mary's Hospital and Uijongbu St. Mary's Hospital between 1. January and 31. December 1994. We classified them according to their age, sex, a sort of drug, the cause of poisoning, prehospital care, time-lapse to arrive at hospital after poisoning, psychiatric problem the status of patients. *We conclude as follows; 1. The male to female ratio was totally 1 : 1.98, 1 : 1.24 in a urban area, 1 : 2.43 in a rural area. 2. On age of the patients in this study, the peake incidence was between 20 and 39(55.2%). 3. On seasonal prevalence, the poisoning was most common in summer and spring, in urban area(35.7%) and rural area(37.0%) respectively. 4. The common drug were as follow; Doxylamine, Organophosphate, Acetaminophen in urban area, Paraquat, Organophospate, Doxylamine in rural area 5. The percentage of suicidal attempt were 81.8% and 87.7% in urban area and rural area respectively. 6. The poisoning patients had psychatric problem in 19.4% and 24.6%, in urban area and rural area respectively. 7. Before arrival to emergency room, 27.7% of patient was done prehospital care in rural area. 8. On arrival to emergency room, 95.1% and 73.8% of patients show stable vital sign in urban area and rural area respectively.

面單位 農村地域의 類型化에 관한 硏究 : 西部慶南을 中心으로 Based on Sobu Kyongnam

愼英喆,李裕根,黃龍鎭 진주산업대학교 1992 論文集 Vol.31 No.-

本 硏究에서는 行政 및 文化生活의 基礎自 治單位인 西部慶南 9개 郡의 100개 面을 標本으로 삼아 因子分析方法등 여러 數理分析技法을 使用하여 村落의 形想를 3개 그룹으로 區分하며 農村地域의 特性을 나타내고 諸 指標를 利用하여 面單位의 農村地域의 土地利用特性과 類型化를 行하였다. 그 結果를 要約하면 다음과 같다. l) 判別된 平野村 25개, 準山村 49개, 山村 20개는 成功化率 94.0%로 3개 그룹으로 效率的인 村落區分이 이루어졌다. 2) 上位 5개 因子의 特性別 地域區分은 제1因子(人口가 많은 평야지대) 제2因子(畜産業이 盛한 地域), 제3因子(農家率이 높은 地域), 제4因子(果樹. 草地造成地域), 제5因子(沓作이 많은 地極)로 區分되었다. 3) 地域의 類型化는 Al類型(53개 面), A2類型(22개 面), B1類型(6개 面), B2類型(2개 面), C1類型(14개 面), C2類型(2개 面),D1類型(1개 面)의 7개 類型으로 區分되었다. 이러한 各 類型別 空間分布의 特性은 該當 農村地域의 地域開發과 關聯된 政策 이나 開發計劃樹立時 그 地域特性에 맞는 發展戰略과 手段이 될 것이다. This study is purposed to investigate the charactristics of using farm land and the classification of the area of rural community in Myo˘n Unit. With materials and methods to study in this paper, Cases and variables are given. The cases of rural settlement in So˘bu Kyo˘ngnam are one hundred. The variables of structure factor are twenty-three. The cases according to analysis are analysised by method of discriminant, factor and cluster analysis. From this study, The results obtained are as follows. 1) The cases of rural settlement are divided three groups by discriminant analysis. There are twenty-five plains, forty-nine Semi plains and twenty Mountain villages in So˘bu Kyo˘ngnam. 2) Five upper factors are analysised factor 1(populous plain), 2(high animal husbandry), 3(high farmhouse rate), 4(frute tree & pasture), 5(rice paddy field) on factor scores by factor analysis. 3) One hundred cases in So˘bu Kyo˘ngnam are classified according to rural settlement. Seven types of classification are the type of A1(53), A2(22), B1(6), B2(2), C1(14), C2(2), D(l).

Terfenadine과 Ketoconazole 복용 후 발생된 Torsades de pointes 심실 빈맥증의 치험 1례

김세경,이기중,유승진,박일영,박승현,임근우,이원재,강동헌 대한응급의학회 1995 대한응급의학회지 Vol.6 No.1

Torsades de pointes is a form of polymorphic ventricular tachycardia that is associated with prolongation of the QT interval, characterized by QRS complexes of progressively changing amplitude and contour that seem to revolve around the isoelectric line. The most common cause of Torsades de pointes induced by antiarrhythmic agents, occupying in certain drugs or toxin, electrolyte disturbance, congenital QT prolongation syndrome. Cardiotoxicity terfenadine, in overdose a widely used, nonsedating antihistamine, has been reported. Case after administration of terfenadine and ketoconazole causing syncope and torsades de pointes have been reported in recommended dose. We report a case of QT prolongation with torsades de pointes after therapeutic administration of terfenadine, a long acting histamine H1 receptor antagonist, together with ketoconazole, an antifungal preparation. The patient is a 43-year-old female, who experienced palpitation, dizziness and syncopal episoders after coadministration of terfenadine and ketoconazole, for a fungal infection of the skin. The ECG showing typical episodes of torsades de pointes with QT prolongation. Magnesium sulfate was given, torsades de pointes did not recur. The patient was discharged with improved condition.

폐구리염화물용액의 분무열분해반응에 의한 생성분말의 특성에 관한 연구

박희범,최재권,한진아,유재근 호서대학교 반도체제조장비국산화연구센터 2001 반도체장비학술심포지움 Vol.2001 No.-

본 연구의 목적은 폐 구리염화물 용액을 원료로 사용하여 분무열분해 공정에 의해 평균입도가 1 ㎛ 이하이며 입도분포가 균일하고 치밀한 조직을 나타내는 미립의 구리산화물 분말을 제조하는데 있다.또한 본 연구에서는 분무열분해 공정에 의해 생성되는 분말의 특성에 영향을 미치는 반응 온도, 원료용액의 유입속도, 분위기기체 및 공기의 유입속도, nozzle tip 크기 및 원료용액의 농도 등의 반응인자들의 영향을 검토하였다.

IPS Empress 도재관의 파절강도 : 하악 중절치에서 절단연 삭제량과 측면 경사도에 따른 영향

남영성,김계순,정영찬,김유리,동진근 원광대학교 치의학연구소 2003 圓光齒醫學 Vol.12 No.1

The purpose of this study was to compare the fracture strength of the IPS Empress ceramic crown according to the incisal depth (1.5mm, 2.0mm, 2.5mm) and axial inclination (4˚, 8˚, 12˚) of the lower central ncisor. After 10 metal dies were made for each group, the IPS Empress ceramic crowns were fabricated and each crown was cemented on each metal die with resin cement. The cemented crowns mounted on the testing jig were inclined 30 degrees and a universal testing machine was used to measure the fracture strength. The results of this study were as follows : 1. The fracture strength of the ceramic crown with 2.0mm depth and 12˚ inclination was the highest (648 N). Crowns of 1.5mm depth and 4˚ inclination had the lowest strength (482 N). 2. There were no significant differences of the fracture strength by axial inclination in same incisal depth group. 3. The fracture mode of the crowns was similar. Most of fracture lines began at the loading area and extended through proximal surface perpendicular to the margin irrespective of incisal depth. There had correlation between fracture strength and fractured surface area.