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        • 오픈소스와 상용 DBMS 의 사용자 기대요인과 만족에 대한 연구

          문정오,김종우 한국경영과학회 2008 한국경영과학회 학술대회논문집 Vol.- No.-

          In this study, an empirical research based on survey has been performed to study the influence of user expectation to user satisfaction of commercial and open source DBMSs. According to the survey results, word-of-mouth and past experiences influence significantly to user expectation, and price influences to user expectation only for commercial DBMS users. The results show that the expectancy disconfirmation influences significantly to user satisfaction. Expectation and satisfaction levels of commercial DBMS users are higher significantly than those of open source DBMS users. However, expectancy disconfirmation of open source DBMS users is higher than that of commercial DBMS users.

        • 3P-702 : p-나이트로클로로벤젠과 p-나이트로페놀을 이용한 옥시디아닐린의 합성 최적화 및 폐수처리

          윤형선,박재범,함종우,정오용,안선진,문세일,서성규 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-

          폴리이미드 필름의 주원료로 사용되는 Oxydianiline(ODA) 디아민 단량체를 합성하기 위해 p-Nitrochlorobenzene(PNCB)와 p-Nitrophenol(PNP)를 이용하여 염기 조건 하에서 축합 반응을 진행하여 Dinitrodiphenylether(DNDPE)를 합성한 후 이를 원료로 수소화 반응을 수행하였다. PNCB, PNP의 몰비, 염기 그리고 용매의 종류를 변경하면서 DNDPE를 합성하였고, 수소화 반응 시, 반응조건인 온도, 압력 그리고 촉매의 비율을 변경하여 수소화 실험을 수행하여 ODA를 합성하였으며, 합성과정에서 발생하는 폐수의 성분도 분석하였다. PNCB, PNP의 몰비를 1, K2CO3를 염기로 사용하여, 용매인 DMSO에서 190°C에서 3시간동안 반응시켰을 경우 DNDPE의 수율이 가장 높았다. 수소화 반응에서는 니켈계 촉매를 사용하여 120°C 20bar에서 반응하였을 경우 가장 높은 수율을 보여주었다. 위의 실험을 통하여 PNCB와 PNP를 이용하여 ODA 합성을 위한 반응 최적조건을 확인하였다. 폐수 성분은 BOD 2,500mg/l, COD-Mn 36,500mg/l, SS 불검출, T-N 851mg/l. T-P 0.36ppm으로 나타났고, 중금속은 불검출 되었다.

        • FEM 프로그램 ABAQUS를 이용한 대형 자동차 프레임의 결합부에 대한 응력해석

          문정오(Jeongoh Mun), 김영권(Youngkweon Kim), 이기수(Kisu Lee) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

          This paper studies on the stress analysis over large-size automobile frame joints. The frame consists of some cross members and two side members. In this case, joints of the frame have a large effect on the automobile motions. So, to study on the contact between the members and the rivets is very important. In order to obtain the more similar real model, the used model in this paper was designed with shell elements and modeled by considering the spring effects. As a result of this study, we can obtain the relations between the cross member anjxthickness and maximum principal stress, also obtain the correlation between the rivets and the maximum principal.

        • KCI등재

          광화학 반응에 의한 TiO2 나노입자 형성 및 광학특성(Ⅰ)

          정재훈,문정오,문병기,손세모,정수태 한국전기전자재료학회 2003 전기전자재료학회논문지 Vol.16 No.2

          TiO2 nanoparticles were prepared by photochemical synthesis in the dry toluene. The shape and size of the amorphous TiO2 nanoparticles were investigated by transmission electron microscope. The particle size was varied by the contents of the titanium (IV) isopropoxide in dry toluene. Especially networked TiO2 particles were formed from 40 % titanium (IV) isopropoxide solution. The optical absorption spectra, photoluminescence, and PL excitation spectra of TiO2 in dry toluene were obtained. The spectra were shifted to the short wavelength as the contents of TiO2 were increased. PL excitation had the peak at the wavelength regions is which the absorption increased steeply.

        • KCI등재

          광화학 반응에 의한 TiO<sub>2</sub> 나노입자 형성 및 광학특성(I)

          정재훈,문정오,문병기,손세모,정수태 한국전기전자재료학회 2003 전기전자재료학회논문지 Vol.16 No.2

          TiO$_2$ nanoparticles were prepared by photochemical synthesis in the dry toluene. The shape and size of the amorphous TiO$_2$ nanoparticles were investigated by transmission electron microscope. The particle size was varied by the contents of the titanium (IV) isopropoxide in dry toluene. Especially networked TiO$_2$ particles were formed from 40% titanium (IV) isopropoxide solution. The optical absorption spectra, photoluminescence, and PL excitation spectra of TiO$_2$ in dry toluene were obtained. The were shifted to the short wavelength as the contents of TiO$_2$ were increased. PL excitation had the peak at the wavelength regions is which the absorption increased steeply.

        • 안드로이드 스마트폰에서 Dex 파일들의 유사도 비교 연구

          고정욱,강성욱,문정오,김동진,조성제 한국소프트웨어감정평가학회 2013 한국소프트웨어감정평가학회 논문지 Vol.9 No.1

          Copyright infringement in Android applications is a growing problem because Android applications can be easily reverse engineered and pirated. In this paper, we propose three techniques for comparing similarity between Android applications in order to detect the theft of the applications. The proposed techniques statically analyze the Dalvik VM executable files in the Dalvik Executable (.dex) format, and measure similarity between the executable files (DEX files). The first technique decompiles DEX (VM bytecode) files into corresponding Java source codes and computes similarity between the decompiled source codes. The second technique extracts string information contained in DEX files and calculates similarity between applications based on the string information. The last technique extracts methods' features defined DEX files and compares similarity between applications based on the features. We evaluate the performance of the proposed techniques in terms of credibility and resilience by carrying out some experiments. 안드로이드 앱은 역분석되기 쉽기 때문에 불법 도용 및 표절에 의한 저작권 침해가 급증하고 있다. 본 논문에서는 안드로이드 앱 저작권 침해 여부를 탐지하기 위한, 앱들 간의 유사성을 비교하는 3가지 방법을 제안한다. 제안기법은 안드로이드 앱의 실행 파일인 Dex 파일을 정적으로 분석하여 유사도를 측정한다. 첫 번째 기법에서는, Dex 파일의 바이트코드를 자바 소스코드로 역컴파일한 후, 역컴파일된 소스코드 간의 유사도를 측정한다. 두 번째 기법에서는, Dex 파일에 포함된 문자열들을 추출하고 문자열 비교를 기반으로 앱 간의유사도를 비교한다. 마지막으로 Dex 파일에 정의된 메서드들로부터 특징정보를 추출하여 유사도를 비교한다. 실험을 통해 각 제안기법의 성능을 신뢰성 및 강인성 측면에서 평가하였다.

        • KCI등재

          외기온도에 따른 도막 방수층 계면에 발생되는 수증기압에 관한 실험적 연구

          고진수,이성복,신윤호,문정오,윤정운 대한건축학회 2007 大韓建築學會論文集 : 構造系 Vol.23 No.4

          Over 30% of the total defects that have occurred recently in the Korean construction market are caused by the construction of defective waterproofing, and the phenomenon of air pockets in the waterproofing layer, which is caused by the concrete vapor pressure, is known to be the primary cause of defective waterproofing. Accordingly, in this study the theory about the relationship between water pressure and temperature as well as the damp-proofing volume of concrete and, then, the change of vapor pressure volume were measured and analyzed by making a test sample after spraying a dampness remover and a waterproofing material to a prepared specimen. As a result of measuring the water vapor pressure for the surface temperature of the waterproofing layer with the fluid-applied membrane temperature based on about 10℃, which is the average temperature of Seoul, it was found that first, the fluid-applied membrane elevated up to about 40℃, and the water vapor pressure generated from the fluid-applied membrane was about 0.3㎏f/㎠ when the surface temperature of the waterproofing layer was raised up to about 80℃. Second, when the fluid-applied membrane temperature of the waterproofing layer was raised from 30℃ to 35℃, about 0.1㎏f/㎠ of water vapor pressure was generated, and when supplying a thermal source to raise the fluid-applied membrane temperature of the waterproofing layer from 35℃ to 40℃, approximately 0.05㎏f/㎠ of water vapor pressure was generated.

        • KCI등재

          Association of COX2 −765G>C promoter polymorphism and coronary artery disease in Korean population

          김인재,김상훈,차동훈,임상욱,문재연,김정오,류창수,박한성,성정훈,김남근 한국유전학회 2019 Genes & Genomics Vol.41 No.9

          Background Cyclooxygenase-2 (COX2) plays a role in the formation of prostaglandins, which contribute to the inflammation involved in atherosclerosis. However, the role of the COX2 −765G>C polymorphism in susceptibility to coronary artery disease (CAD) is controversial. Objective To identify the association between COX2 −765G>C polymorphism with CAD risk in Korean patients. We recruited 622 patients who were diagnosed to have coronary artery disease and 202 controls who did not have history and vascular disease risk factors. Methods Using polymerase chain reaction-restriction fragment length polymorphism, the COX2 −765G>C polymorphism was analyzed in 622 Korean patients who received percutaneous coronary intervention and in 202 healthy control subjects. Results The GC+CC genotype frequencies of the −765G>C polymorphism were significantly different between the CAD and control groups. The COX2 −765G>C polymorphism showed peculiar associations with CAD according to the presence of hyperlipidemia and plasma folate levels. However, there were no associations between the −765G>C polymorphism and the rates of hypertension, diabetes mellitus, or homocysteine levels. Conclusion This study suggests that the COX2 −765G>C polymorphism is a possible genetic determinant for the risk of CAD, and an individual risk factor in Koreans. Thus, further association studies between the COX2 polymorphism and atherosclerotic-related diseases such as cerebrovascular or cardiovascular diseases in other races or ethnicities will be needed.

        • 도막 방수층 계면에 발생되는 수증기압에 관한 실험적 연구

          신윤호(Shin Yun-Ho), 윤정운(Yun Jung-Woon), 문정오(Mun Jung-O), 고진수(Ko Jin-Soo) 한국구조물진단유지관리학회 2006 한국구조물진단학회 학술발표회논문집 Vol.10 No.2

          As a result of measuring the water vapor pressure for the surface temperature of the waterproofing layer with the fluid-applied membrane temperature based on about 10℃, which is the average temperature of Seoul, it was found that first, the fluid-applied membrane elevated up to about 40℃, and the water vapor pressure generated from the fluid-applied membrane was about 0.03N/㎟ when the surface temperature of the waterproofing layer was raised up to about 80℃. Second, when the fluid-applied membrane temperature of the waterproofing layer was raised from 30℃ to 35℃, about 0.01N/㎟ of water vapor pressure was generated, and when supplying a thermal source to raise the fluid-applied membrane temperature of the waterproofing layer from 35℃ to 40℃, approximately 0.005N/㎟ of vapor pressure was generated.

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