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30 MHz에서 300MHz 대역의 전자파 장해 즉정용 광대역 기준 안테나
조원서,황호정 한국통신학회 2000 韓國通信學會論文誌 Vol.25 No.3
A broadband antenna available in the range of 30MHz for electromagnetic interference (EMI) test is proposed in this paper, This antenna is configurated in a disk-loaded cylindrical dipole (DLCD) connected to an 180。 hybrid balun consisting of two coaxial feeders. The performance of EMI antenna is characterized with its accurate antenna factor. The antenna factor for this antenna is obtained by using the method of moments and the calculated results are compared with the measured ones. Normalized site attenuation (NSA) is also measured by using this antenna. The results present that the propose antenna could be used for a reference antenna having measurement reproducibility and represented by a theoretically accurate analysing model in EMI measurement.
[EMC 관련 최근 기술 동향]Measurement Distances for Radiated Emission under In-Situ Measurement Conditions
조원서(Won-Seo Cho) 한국전자파학회 2005 전자파기술 Vol.16 No.4
The CISPR/H/WG4 takes charge of a new generic emission standard for in-situ measurements. The new generic standard will cover all types of equipment which for what so ever reasons can not be tested in standardized test sites and for which provisions for in-situ testing are not covered by the appropriate product standards(e.g. equipment covered by CISPR 11 and CISPR 22). One of CISPR/H/WG4 tasks is to check which measurement distances shall be used depending on the condition of the case. In this document, the measurement distances under the in-situ condition of cases specified in the standards are explained and a new measurement distance with height dependent concept is proposed.
조원서(Won-Se Jo),김동한(Dong-Han Kim),류근호(Keun-Ho Rew) 제어로봇시스템학회 2013 제어·로봇·시스템학회 논문지 Vol.19 No.12
In this paper, a robot arm capable of recognizing and drawing various line thicknesses is developed. Conventional line drawing robots are not capable of adjusting the thickness of lines. However, to draw faster and to enrich the expression of line drawing robots, it is necessary to adjust line thickness using a brush pen. Simple images are acquired and various line thicknesses are recognized by image processing. Trajectories of lines are generated with distance sorting using thinning and corner point detections for each label. Information on line thickness and trajectory is sent to the controller of a robot arm taking into consideration 2D inverse kinematics. Through this process, the robot arm can draw various lines thicknesses along 2D trajectories with 3 motors. Robot arm for detailed drawing will be studied in the future.