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유기물 템플레이트를 이용한 다공성 티타늄 산화물의 합성 및 염료감응 태양전지로의 적용
이진규(Lee, Jin-Kyu),오제경(Oh, Jae-Kyung),김현수(Kim, Hyun-Su),박경원(Park, Kyung-Won) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06
가수분해 및 응축반응을 사용하여 다공성의 TiO2입자를 합성하였다. 다공성 구조의 열적 영향을 살펴보기위해 annealing 시간을 조절하였고 태양전지에 적용하기 위해 paste로 만들었다. 그 구조적 특성을TEM(Transmission electron microscopy)과 XRD(X-ray diffraction) 통하여 분석하였고 광 전기화학적 활성을 측정해 보았다. 결과적으로 3시간 열처리한 시료의 효율이 최적화된 조건이였음을 확인하였다.
CFD를 이용한 접시형 태양열 집열기의 Transient 열전달 성능 해석
오상준(Oh, Sang-June),이주한(Lee, Ju-Han),서주현(Seo, Joo-Hyun),이진규(Lee, Jin-Gyu),조현석(Cho, Hyun-Seok),서태범(Seo, Tae-Beom) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.10
A numerical and experimental studies are carried out to investigate the transient heat transfer characteristics of 5kWth dish type solar air receiver. Measured solar radiation and temperatures at several different locations are used as boundary conditions for numerical simulation. Many parameters' effects (reflectivity of the reflector, the thermal conductivity of the receiver body, transmissivity of the quartz window, etc.) on the thermal performance are investigated. Discrete Transfer Method is used to calculate the radiation heat exchange in the receiver. A transient heat transfer model is developed and the rate of radiation, convection and conduction heat transfer are calculated. Comparing the experimental and numerical results, good agreement is obtained. Using the numerical model, the transient heat transfer characteristics of volumetric air receiver for dish type solar thermal systems are known and the transient thermal performance of the receiver can be estimated.
3차원 형태의 TiO<sub>2</sub>-nanobranch 전극을 이용한 염료감응형 태양전지
오제경(Oh, Jae-Kyung),이진규(Lee, Jin-Kyu),김현수(Kim, Hyun-Su),박경원(Park, Kyung-Won) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06
본 연구는 염료감응형 태양전지에 적용되는 TiO2 나노입자를 개선하여 3차원적인 nanobranch를 수열법으로 합성하여 전자의 이동을 향상시키며, 비표면적을 늘려 효율향상을 위하여 전극 구조를 제어하였다. nanobranch의 seed인 nanowire를 XRDd, FE-TEM과 solar simulator를 이용하여 비교 분석하였다.
CFD를 이용한 접시형 태양열 집열기의 과도 열전달 모델 해석
오상준(Oh, Sang-June),이주한(Lee, Ju-Han),서주현(Seo, Joo-Hyun),이진규(Lee, Jin-Gyu),조현석(Cho, Hyun-Seok),서태범(Seo, Tae-Beom) 한국신재생에너지학회 2008 신재생에너지 Vol.4 No.4
A numerical and experimental studies are carried out to investigate the transient heat transfer characteristics of 5kWth dish type solar air receiver. Measured solar radiation and temperatures at several different locations are used as boundary conditions for numerical a. Many parameters' effects (reflectivity of the reflector, the thermal conductivity of the receiver body, transmissivity of the quartz window, etc.) on the thermal performance are investigated. Discrete Transfer Method is used to calculate the radiation heat exchange in the receiver. A transient heat transfer model is developed and the rate of radiation, convection and conduction heat transfer are calculated. Comparing of the experimental and the numerical results, results of both are in good agreement. Using the numerical model, the transient heat transfer characteristics of volumetric air receiver for dish type solar thermal systems are known and the transient thermal performance of the receiver can be estimated.
Kang Hyeona,Oh Yourim,Nam Keun Lee,이진규 한국미생물·생명공학회 2022 Journal of microbiology and biotechnology Vol.32 No.12
In this study, we investigated the optimal conditions for 3D structure printing of alternative fats that have the textural properties of lard using beeswax (BW)-based oleogel by a statistical analysis. Products printed with over 15% BW oleogel at 50% and 75% infill level (IL) showed high printing accuracy with the lowest dimensional printing deviation for the designed model. The hardness, cohesion, and adhesion of printed samples were influenced by BW concentration and infill level. For multi-response optimization, fixed target values (hardness, adhesiveness, and cohesiveness) were applied with lard printed at 75% IL. The preparation parameters obtained as a result of multiple reaction prediction were 58.9% IL and 16.0% BW, and printing with this oleogel achieved fixed target values similar to those of lard. In conclusion, our study shows that 3D printing based on the BW oleogel system produces complex internal structures that allow adjustment of the textural properties of the printed samples, and BW oleogels could potentially serve as an excellent replacement for fat.
수치해석 기법을 이용한 자동차 헤드램프 렌즈의 습기발생 기초연구
오상준(Sangjune Oh),이진규(Jingyu Lee),이주한(Juhan Lee),우창완(Changoan Woo),김종복(Jongbok Kim),서태범(Taebeom Seo) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In order to predict the water vapor condensation characteristics which occurs on the inside of the automobile headlamp lens, the CFD analysis was used in this study. Water vapor condensation on the inside surface of the head lamp lens is an essential factor that affects secure front view and headlamp life. One of the headlamps of automobile which is one of the most popular in Korea was chosen for the present analysis. In the basis of the experimental data of automobile given by a manufacturer, boundary conditions were defined and free convection of the air inside the headlamp and radiation from the bulb to the other surfaces are considered. As a result, temperature distribution of the inside surface of the headlamp lens are approximately the same as the experimental result.