박층 폴리머 콘크리트 덧씌우기 포장 공법의 국내 도입 현황

최문규,김동혁,홍승호,정진훈 한국도로학회 2022 도로 : 도로학회지 Vol.24 No.2

후면 통기 조건에 따른 강판일체형 태양광 모듈의 온도 특성 분석 연구

최문규,이효문,최민주,김재원,윤종호,김동수 한국태양에너지학회 2023 한국태양에너지학회 논문집 Vol.43 No.3

Building-integrated photovoltaic (BIPV) systems are gaining global popularity as a means to reduce carbon emissions. The optimal implementation of BIPV requires consideration of various physical factors. One such factor is the temperature rise of the photovoltaic module, which can have detrimental effects, such as decreased power generation and thermal damage. The temperature rise is influenced not only by weather conditions, but also by the finishing characteristics of the building envelope, including the surrounding finishing conditions and bonding materials. In this study, the thermal conditions of BIPV systems were assessed by analyzing the rear air and back surface temperatures under different rear natural ventilation conditions. Experiments were conducted using steel-plate-integrated solar modules and steel plates, and back surface and air temperature data were collected from these simulated systems. The experimental conditions were categorized based on whether the ventilation control vents located at the upper and lower ends of the system were open or closed. The experimental results showed that the average back-surface temperature of the solar module was approximately 11°C higher during high solar irradiance conditions (800 W/m2) in summer, when both the upper and lower ventilation control vents were shut off, compared to the conditions in which both vents were open. These findings confirm the need for back-ventilation adjustments when implementing BIPV systems.

NUREG-0654/FEMA-REP-1, Rev. 2(2019) 국내 적용방안 고찰

최문규,이의동,김명호,김성민 대한방사선방어학회 2020 대한방사선방어학회 학술발표회 논문요약집 Vol.2020 No.11

서평 『하이너 뮐러 연구』

최문규 한국독어독문학회 1998 獨逸文學 Vol.65 No.1

세계의 은유와 은유의 세계

최문규 애산학회 1999 애산학보 Vol.22 No.-

자율적 예술과 가상 : 헤겔 미학에서의 " 가상 " 개념에 관한 연구 Eine Studie zum Begriff " Schein " in Hegels Asthetik

최문규 한국독어독문학회 1998 獨逸文學 Vol.65 No.1

박층 에폭시 덧씌우기 포장의 부착성능과 미끄럼 저항 현장시험

최문규,이재훈,홍승호,성시완,정진훈 한국도로학회 2021 한국도로학회논문집 Vol.23 No.6

PURPOSES : On a thin epoxy overlay pavement, epoxy is placed on the existing bridge deck pavement, followed by the spraying of aggregates on it. The bond strength between the existing pavement and overlay pavement is an important factor representing the performance of the thin epoxy overlay pavement, in addition to the skid resistance and roughness. Therefore, the bond strength, skid resistance, and roughness of a thin epoxy overlay pavement constructed for field tests under various field conditions are examined in this study. METHODS : The usability of epoxy and aggregates on a thin epoxy overlay pavement is identified by testing their material properties in a laboratory. A construction test is performed using the pretreatment conditions of the existing pavement surface and the number of layers of overlay pavement as variables. The bond strength, skid resistance, and roughness are analyzed 3 d after constructing the test pavement, and immediately before and after applying repetitive traffic loadings at 6 months. RESULTS : When the existing pavement is in good condition, as in this study, the bond strength of the thin epoxy overlay pavement is affected more significantly by the existing pavement condition than the material properties of epoxy, in which destruction is indicated in the existing pavement. The skid resistance is affected primarily by the condition of the aggregates sprayed on the epoxy. The pavement on which the aggregates are well sprayed indicate a high skid resistance. The roughness is not affected by any variables, such as the pretreatment conditions, number of thin pavement layers, and repetitive traffic loadings. CONCLUSIONS : A long-term evaluation of the bond strength, skid resistance, and roughness will be conducted on a test pavement. In addition, another construction test will be performed to investigate the performance of a thin epoxy pavement overlaid on a bridge deck pavement under inferior conditions.

Light intensity and its fluctuations on a layered microsphere: Effects of shell thickness acting as a quantum well

최문규,Jemin Pyun 한국물리학회 2008 Current Applied Physics Vol.8 No.5

The present study is an extension of the former research where a double-layer microsphere is irradiated by monochromatic unpolarized plane light. One can realize intensity fluctuations on the particle surface by the numerical boundary element method. The effect of the shell thickness is primarily investigated in the present study. A refractive index reflects its potential energy photons experience in a domain. The potential energies in the air, shell, and core are different from one another with the smallest in the shell. As the shell thickness reduces, the shell layer behaves like a quantum well after a critical thickness. The resultant light intensities on the particle surface show noise-like fluctuations depending on such parameters as the shell thickness, the light wavelength, the particle size, etc. Noticeable fluctuations appeared with the shell thicknesses less than around 5 nm. The thinner the shell, the stronger the intensity fluctuations, suggesting the more light absorbing ability. More efficient photon energy absorption observed with quantum well optoelectronic devices should be explained by stronger intensity fluctuations, not by higher intensities ensuing from photon confinement in quantum wells.

광촉매입자 표면에서의 광강도 노이즈현상

최문규,김정무,강창일 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.1

광촉매 반응에서 빛의 강도(intensity)는 일종의 반응물로서 포함된다. 광촉매표면 반응에 있어서 양자 역학적 영향이 반응에 미치는 효과에 대해서 아직 밝혀지지 않은 것이 많다. 예비연구의 결과로서 밝혀진 바에 따르면 이층구의 표면 광세기가 광전자공학장치에서 예측되고 실험으로 증명할 수 있는 shot noise와 유사한 많은 noise를 볼 수 있었다. 빛과 입자는 그 크기가 같은 정도일 때 상호작용을 한다. 1 마이크로미터 정도의 크기를 갖는 입자도 그 내부구성물질의 크기정도는 나노 수준이다. 이렇게 작은 부분과 광은 양자역학적으로 상호작용하고 그 결과로서 노이즈 현상을 보이게 된다. 따라서 입자 내 반복단위의 크기를 변화시키면서 파장에 따른 노이즈의 크기변화를 연구할 필요가 있다.무작정한 브라운 힘에 의하여 유체의 에너지가 미립자에 전달되었다가 다시 유체 속으로 소산 (dissipation)되듯이 광촉매 표면에서의 광자분포의 요동(fluctuaton)이 광에너지의 광촉매입자로의 흡수를 가능하게 한다. 이 흡수된 광에너지가 어떤 메카니즘을 통하여 광촉매 표면에 있는 반응물에 작용함으로써 반응을 활성화시킨다고 추정할 수 있다. 본 연구를 통해서 광촉매표면에서의 국소적 광세기 요동현상을 규명하고 예측하며 나아가 반응속도를 증진시키는 데 도움이 되는 방법을 찾을 수 있을 것이다. 광촉매반응에서 촉매입자 표면의 광에너지 분포를, 반응실험을 통하여 반응속도식을 도출하는 과정에 포함시키기 위한 이론적 타당성을 제시함을 목적으로 한다.

시공 중인 시멘트 콘크리트 포장의 프로파일 측정 및 보정방법 개발

최문규,김동혁,김진수,나계주,정진훈 한국도로학회 2021 한국도로학회논문집 Vol.23 No.5

PURPOSES : For high driving performance and service life of cement concrete pavement, construction quality must be secured. The construction quality is to be measured after pavement construction, but in this case, it is difficult to improve construction quality. Therefore, it is necessary to develop a method for measuring and correcting the profile of the pavement and subbase so that the construction quality can be monitored immediately after construction. METHODS : The device that can measure the construction quality of cement concrete pavement has been developed. Through the experiment simulating the field situation, the profile of the pavement and subbase was measured and calibration method was developed. RESULTS : In the measured profile, an outlier by the sensor and noise by the sensor and vibration were measured, and a step-like profile was measured differently from the acture one. To remove outliers, the boxplot outlier removal method was applied by overlapping each data group. The noise were removed by a low pass filtering. And, it was calibrated to a profile similar to the acture one through the sampling interval adjustment and the weighted moving average method. CONCLUSIONS : The method that can measure and calibrate the profile that is almost identical to the actual one has been developed. Accordingly, it is expected that the performance of the pavement can be improved by accurately monitoring the construction quality immediately after construction.