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Design and Analysis of a Resonant Reactive Shield for a Wireless Power Electric Vehicle
Seonghwan Kim,Hyun-Ho Park,Jonghoon Kim,Jingook Kim,Seungyoung Ahn Professional Technical Group on Microwace Theory a 2014 IEEE Transactions on Microwave Theory and Techniqu Vol. No.
<P>In this paper, we propose the concept and design methodology for a resonant reactive shield for the reduction of magnetic field leakage from a wireless power transfer (WPT) systems. By using LC resonance, the reactive shield can generate a cancelling magnetic field to reduce the incident magnetic field from WPT coils and effectively reduce the total magnetic field without consuming additional power. The shielding effectiveness of the resonant reactive shield and its effect on WPT efficiency are analyzed with simulation and measurements. For practical application to wirelessly charged electric vehicles, an automatic tuning system for the resonant reactive shield is also proposed and implemented. The effectiveness of a resonant reactive shielding is verified by experiments in a wirelessly charged electric bus.</P>
김정은 시대 북한의 습지 보전·이용 현황과 남북협력에 대한 시사점
김성환 ( Kim Seonghwan ),김민하 ( Kim Minha ),강초롱 ( Kang Chorong ) 평화문제연구소 2022 統一問題硏究 Vol.34 No.2
Since Supreme Leader Kim Jong-un took power, North Korea has recognized the importance of the wetland ecosystem, which is a major component of the natural ecosystem, and has been attempting to systematically manage, preserve, and use wetlands. North Korea's interest stands out in establishing foundation for the wetland management system, a cooperative system for wetland conservation and sustainable use, a wetland conservation system, and promoting wetlands. The change in North Korea's perception of wetland space is largely due to the re-recognition of ecosystem services provided by wetlands. In addition, changes of circumstance faced by North Korea, such as fostering tourism industry and need to participate in the implementation of sustainable development, served as a strong driving force behind the re-recognition of ecosystem services provided by wetlands. The North Korean authorities' interest in the preservation and use of wetlands is a welcome issue for the establishment of a community of life on the Korean Peninsula; and for the establishment of community of human. This is because the nature of wetlands inevitably requires cooperation and solidarity from the international community. It is necessary to elicit North Korea's demand for cooperation reflected in the change of wetland space perception and to gradually promote inter-Korean wetland cooperation based on the results.
A Critical Review of Defining Teacher-Student Relationship as Supplier-Consumer Relationship
( Seonghwan Kim ) 한국유아교육학회 2021 정기학술대회 논문집 Vol.2021 No.1
This paper aims to examine understanding that relationships between teachers and students can be explained by relations between suppliers and consumers. To this end, three themes (e.g., the pluralistic traits of human life, curriculum as consumption goods, and the value of curriculum) were discussed. This paper concluded that the relationships between teachers and students cannot be reduced to an economical phenomenon. This conclusion implies the necessity to create theoretical frameworks for comprehending relationships between teachers and students within an educational phenomenon.