제주 북부 해역에 서식하는 저서다모류 군집의 시 · 공간적인 분포

김광배,손대선,박혜란,김다예,마채우 한국수산과학회 양식분과 2017 한국수산과학회 양식분과 학술대회 Vol.2017 No.5

Properties of Dye Sensitized Solar Cells with Adding Nano Carbon Black into Blocking Layer

김광배,노윤영,송오성 한국세라믹학회 2015 한국세라믹학회지 Vol.52 No.4

Blocking layers with nano carbon blacks (NCBs) were prepared by adding 0.0 ~ 0.5 wt% NCBs to the TiO2 blocking layer. Then, dye sensitized solar cells (DSSCs) were fabricated with a 0.45 cm2 active area. TEM and micro-Raman spectroscopy were used to characterize the microstructure and phases of the NCBs, respectively. Optical microscopy and AFM were used to analyze the microstructure of the TiO2 blocking layer with NCBs. UV-VIS-NIS spectroscopy was used to determine the band gap of the TiO2 blocking layer with NCBs. A solar simulator and potentiostat were used to determine the photovoltaic properties and impedance of DSSCs with NCBs. The energy conversion efficiency (ECE) increased from 3.53 to 6.20 % when the NCB content increased from 0.0 to 0.3 wt%. This indicates that the effective surface area and electron mobility increased in the TiO2 blocking layer with NCBs. However, the ECE decreased when the NCB content was increased to over 0.4 wt%. This change occurred because the effective electron transport area decreased with the addition of excessive NCBs to the TiO2 blocking layer. The results of this study suggest that the ECE of DSSCs can be enhanced by adding the appropriate amount of NCBs to the TiO2 blocking layer.

페로브스카이트 태양전지의 Au 열증착 조건에 따른 Hole Transport/Perovskite 층의 물성변화

김광배,박태열,송오성 대한금속·재료학회 2018 대한금속·재료학회지 Vol.56 No.4

Changes in the properties of the hole transport layer (HTL) and the perovskite layer in a perovskite solar sell (PSC) were observed under various Au thermal evaporation conditions. We employed a conventional thermal evaporator with a distance of 30 cm between the source and substrate in a vacuum of 6 × 10-6 torr. We prepared 70 nm-thick Au layers on PSCs by varying the evaporation condition: 60 W-90 min, 70 W-60 min, 80 W-25 min, 90 W-10 min, and 100 W-7 min. Subsequently, the photovoltaic properties of the PSC were measured for each deposition condition. Also, the microstructure of the HTL/perovskite was observed using a scanning electron microscope (SEM) and electron probe xray micro-analyzer (EPMA) after the Au layer was selectively removed. The most outstanding energy conversion efficiency (ECE) was measured for the 80 W-25 min condition. The ECE was extremely low at relatively low power-long time (60 W-90 min, 70 W-60 min) conditions, due to contamination of the HTL and the perovskite layers during the Au evaporation. The contamination was confirmed from the SEM and EPMA investigations. Moreover, even with high powered-short time (90 W-10 min, 100 W-7 min) conditions, the HTL underlayer of the electrode was damaged due to the high deposition energy.

금속처리 공장에서의 연속공정 제어 기술

김광배,오상록,조영조,조창흠 대한전기학회 1990 전기의 세계 Vol.39 No.6

제올라이트 종류에 따른 수분 흡착 특성 평가

김광배,임예솔,김은석,진새라,이현준,김성훈,노윤영,송오성 대한금속·재료학회 2020 대한금속·재료학회지 Vol.58 No.7

The properties and H2O adsorption characteristics of two types of zeolites (3A and 13X) with the same shape but different element composition were identified. These zeolites are used in gas purification processes to manufacture 9N ultra-pure inert gases for semiconductor process applications. To analyze the shape and microstructure of the zeolites, an optical microscope and FE-SEM were used. EDS, micro-Raman, and XRD analysis were conducted to analyze their compositions and properties. BET analysis was performed to identify their specific surface areas. Finally, a breakthrough analysis was conducted at room temperature. Based on the results of the optical and microstructure analyses, the cylindrical shaped 3A and 13X were determined to be composed of 2.5-um polyhedrons and 1.4-um massive shapes, respectively. The results of the compositional analysis showed that the main components of both zeolites were Si and Al, whereas K and Na existed in 3A and 13X, respectively. The results of the specific surface area analysis demonstrated that the surface area of 13X was 32 times larger than that of 3A. Specifically, the total specific surface areas were 22.42 and 720.33 m2/g for 3A and 13X, respectively. The results of the H2O adsorption characteristic analysis showed that the H2O concentration of 13X was 1.33 times higher than that of 3A. Therefore, with respect to using zeolite for gas purification process applications, 13X might be more suitable to achieve excellent specific surface area and remarkable H2O adsorption.

건설현장의 IoT기반 스마트 안전관리시스템 구축을 위한 아키텍처에 관한 연구

김광배,이제동,김의정,신용태 한국IT정책경영학회 2021 한국IT정책경영학회 논문지 Vol.13 No.1

The fourth industrial revolution technology, which has become a hot topic in recent years, is applied to the construction sector to increase the value of the use of IoT by utilizing various forms of sensors, to prevent workers' risks in advance, and to develop an architecture for building an IoT-based smart safety management system at construction sites. To this end, the concept of IoT was identified and the safety management process on the ground was developed as an architecture that takes the convenience of workers into consideration. In order to build a smart safety management system, available dangerous areas were schematized, applicable areas were grasped, and various prior prediction analysis algorithms were utilized to analyze prior prediction types related to disaster prevention. Based on this, the tendency of the user in the dangerous area is grasped, and a smart safety management system based on the construction site IoT foundation is constructed by providing prior information in the dangerous area.

전력전자에서의 마이크로프로세서 응용 기술

김광배 대한전자공학회 1987 전자공학회지 Vol.14 No.6

IoT 기반 건설안전 서비스의 수용의도에 영향을 미치는 요인에 관한 연구

김광배,정지영,송일형,신용태 한국IT정책경영학회 2021 한국IT정책경영학회 논문지 Vol.13 No.2

Super-consolidated technology is cited as the main technological factor of the 4th Industrial Revolution. Through IoT technology, various equipment, data, goods and processes are organically connected to each other, and intelligent services tailored to location and time are being actively expanded as services to improve the working environment at the level of preventing industrial accidents at construction sites and to prevent accidents involving workers. The IoT Infrastructure Construction Safety Service provides information in a practical and comfortable environment by securing safety zones in hazardous areas at construction sites and providing workers with safe work environments. In this study, a questionnaire was conducted on companies using IoT infrastructure construction safety services, and research was carried out on factors affecting the intention to accept IoT infrastructure construction safety services effective in accident prevention.

ZrO2 전자전달층 두께에 따른 우레아 첨가 페로브스카이트 태양전지의 물성

김광배,송오성 대한금속·재료학회 2021 대한금속·재료학회지 Vol.59 No.1

The properties of 6 mM urea added perovskite solar cells (PSCs) according to ZrO2 electron transport layer (ETL) thicknesses of 204, 221, 254, and 281 nm were examined. A solar simulator was used to characterize the photovoltaic properties of the cell. Optical microscopy and field emission scanning electron microscope were used for the microstructure analysis, and a 3D profiler was used to analyze surface roughness. UV-VIS-NIR was used to analyze transmittance. From the photovoltaic analysis result, an energy conversion efficiency (ECE) of 14.93% was exhibited by the cell with a 221 nm-ZrO2 layer and added urea. From the analysis result of microstructure and surface roughness, 384 nm grain size was obtained through appropriate surface roughness of base layer for perovskite growth and the grain size coarsening by the urea under the 221 nm-ZrO2 condition. For this reason, ECE increased as the resistance of the grain boundary decreased. When the thickness of the ETL was increased above 250 nm-ZrO2, the ECE decreased due to the reduction in light transmittance, and light reaching the perovskite layer. Therefore, the ECE of PCS could be enhanced by selecting a ZrO2 layer with the appropriate thickness and the addition of urea.

Determination of Gravity Anomaly Using Satellite Altimeter Data in the Great Lakes

김광배,이석배 대한토목학회 2002 KSCE JOURNAL OF CIVIL ENGINEERING Vol.6 No.3

In this paper, the determination of gravity anomalies in the Great Lakes using satellite altimeter data of GEOSAT Geodetic Mission (GM) and TOPEX/Poseidon is discussed. The seasonal change of lake level was observed from TOPEX/Poseidon satellite altimeter data. This analysis of lake level change was made to determine the mean lake surface profiles along the TOPEX/Poseidon repeat tracks. The least squares collocation was used to predict gravity anomalies. The gravity anomalies are determined by using mean lake surface profiles derived from TOPEX altimeter data and along-track slopes and azimuth derived from lake surface heights measured by the GEOSAT altimeter. To remove influences of the cycle-to-cycle time variation of lake level, along-track slopes of altimeter height are used. These results are compared to the exisiting surface gravit data measured in the Great Lakes. The gravity anomaly in the Lake Huron derived from the altimeter data using the least squares collocation shows slightly better comparison with the surface gravity anomaly than that implied by the EGM-96 gravity model.