https://oak.chosun.ac.kr/handle/2020.oak/19126 2025-09-19T21:26:50Z 2025-09-19T21:26:50Z 정종안 황우채 https://oak.chosun.ac.kr/handle/2020.oak/19149 2024-04-30T02:32:22Z 2015-12-31T15:00:00Z

Title: 차체 경량화용 CFRP 박육부재의 충돌압궤특성 Author(s): 정종안; 황우채 Abstract: Important issues in the design of the vehicles could be represented such as reducing CO2 emissions and improving the fuel economy. However, vehicle safety is ensured in a state in which the design is to reduce the weight of vehicle weight reduction for the wings to be made. In this study, a representative of lightweight material CFRPs (carbon fiber reinforced plastic), thin-walled members using the CFRPs were studied after the collapse crash. Also, experimental investigations are carried out for the CFRP thin-wall member and in order to study the effect of various stacking condition. Static and impact collapse tests were performed with change of the interface numbers, such as fiber orientation angle. Collapse modes and energy absorption characteristics had been analyzed.

2015-12-31T15:00:00Z Van-Thuan Tran Tan-Tai Tran Minh-Khai Nguyen Hong-Woo Lim Won-Bae Kim https://oak.chosun.ac.kr/handle/2020.oak/19155 2024-04-30T02:32:22Z 2015-12-31T15:00:00Z

Title: Cascaded Single-Phase Boost Inverter Using High Frequency Transformer Author(s): Van-Thuan Tran; Tan-Tai Tran; Minh-Khai Nguyen; Hong-Woo Lim; Won-Bae Kim Abstract: Quasi-switched boost inverter was investigated to replace Z-source inverter and switched-boost inverter in the field of low power applications because it uses one-LC-pair less than Z-source inverter. In this paper, we suggest the configuration of H-bridge quasi-switched boost inverter based on high frequency transformer (H-qSBI) to improve voltage gain factor. The proposed topology contains the same devices like switched boost inverter, where the active switch is replaced by an H-bridge inverter. This paper focuses on analyzing quasi-switched boost inverter (qSBI) implementation and simulating the performing results of cascaded single-phase dual-inverter using high frequency transformer by PSIM simulation software. The results are tested by an input DC voltage of 36 V to generate an AC voltage of 220Vrms/50Hz.

2015-12-31T15:00:00Z 고범석 황민구 황태연 https://oak.chosun.ac.kr/handle/2020.oak/19153 2024-04-30T02:32:22Z 2015-12-31T15:00:00Z

Title: 조명환경관리구역 설정을 위한 광주광역시 빛공해 사례조사 Author(s): 고범석; 황민구; 황태연 Abstract: This study aims to suggest the basic data for making enactments of the anti-light pollution by Gwangju Metropolitan City. For this purpose, four target areas which were classified such as natural, residential and commercial areas according to ‘Light Pollution Prevention Act by night lighting’ were selected, and the field surveys were performed by measuring luminance. As a result, approximately 82% among the measuring points were over illuminated as compared with the criteria of light pollution and some solutions were necessary to prevent from light pollution in night time especially residential and commercial areas in Gwangju.

2015-12-31T15:00:00Z Hyeonjin Lee Chae-Og Park https://oak.chosun.ac.kr/handle/2020.oak/19148 2024-04-30T02:32:22Z 2015-12-31T15:00:00Z

Title: Design of Printed Multi-band Double Dipole Antenna for Wireless Communication Applications Author(s): Hyeonjin Lee; Chae-Og Park Abstract: This paper intends to propose a printed multi-band monopole antenna for wireless local area network(WLAN). The proposed antenna is consisted of the two difference size alternated branches by modified monopole and alternated strips and tapered matching with modified ground plane. The proposed antenna has a low profile and can easily be fed by microstrip line. Prototypes of the proposed antenna designed for WLAN operations in 2.4, 5 GHz bands have been designed and tested. The proposed antenna was obtained good radiation characteristics. The simulated bandwidth for VSWR≤ 2 is 0.98 GHz (2.1~3.08), 1.74 GHz 93.98 ~ 5.72) 1.18 GHz (6.6 ~7.78). The simulation peak gain is 2.8 dBi at 5.45 GHz.

2015-12-31T15:00:00Z