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EMI/EMC 실험을 위한 Four-wires을 이용한 안테나 설계
강성원,김준규,소준호,정용식,천창율,Gang, Sung-Won,Kim, Jun-Kyu,So, Jun-Ho,Chung, Young-Seek,Cheon, Chang-Yul 한국전자파학회 2007 한국전자파학회논문지 Vol.18 No.6
In this paper, a Four-wired antenna was designed and manufactured using Four-wires in order to perform EMI/EMC experiments. As compared with a TEM cell, the feature of the Four-wired antenna has simple installment with broadband balun, a Four-wired antenna, and loading resistances in an anechoic chamber. And the E-field polarization of antenna can be easily changed. Without the limitation of space, EMI/EMC experimental environment could be built within the anechoic chamber with the moderate cost. In S, C, and X-bands, the manufactured antenna was able to make an experiment on EMI/EMC with the DUT which has the quiet zone of the height, width, length equal to about 10 cm. 본 논문은 Four-wired 안테나를 이용하여 EMI/EMC 실험을 할 수 있는 안테나를 설계, 제작하였다. 일반 TEM-cell과 비교하여 이번 논문에서 설계, 제작하는 안테나의 특징은 무반향실에 broadband balun, Four-wired 안테나와 Loading resistances을 쉽게 설치하여, E-field polarization을 선택 할 수 있다는 점이다. 그리고 공간의 제약없이 기존의 무반향실을 이용하여 적은 비용으로 EMI/EMC 실험 환경을 구축할 수 있다. 제작된 안테나는 S, C 및 X-band에서 EMI/EMC 실험을 할 수 있는 가로, 세로, 높이 모두 약 10 cm 정도의 크기를 갖는 quiet zone을 얻을 수 있었다.
Kim, Chang Yul,Kim, Yeon Gyeong,Sin, So Jung,Koo, Hyojin,Cheon, Kicheol,Kim, Dongsoo Karger 2018 NEUROIMMUNOMODULATION -BASEL- Vol.25 No.1
<P><B><I>Objectives:</I></B> Ginsenoside Rg1 and mebicar have been reported to have broad efficacy spectrum, including anti-anxiety and anti-stress. These drugs have been used not only for treatment but also for the purpose of increasing resistance from disease. A specific aim of this study was to investigate whether mebicar or ginsenoside Rg1 can prevent physiological changes resulting from intermittent unpredictable stress (IUS). <B><I>Methods:</I></B> Seven week-old Balb/cByJ mice were administered orally with mebicar (10 mg/kg) or ginsenoside Rg1 (10 mg/kg) starting from a week before they were exposed to IUS until the end of the experiment. IUS, which consists of psychological stress and physical fatigue, was set as 3 bouts (24 h/bout) exposure in a 2-week period. <B><I>Results:</I></B> IUS caused hyperactivity and anxiety-like behavior, which were not inhibited by mebicar or ginsenoside Rg1. IUS mice treated with mebicar or ginsenoside Rg1 recovered rapidly from anxiety-like behavior induced by the multiplexed stress compared to the mice not orally treated with mebicar or ginsenoside Rg1. Mebicar or ginsenoside Rg1 could not prevent the decrease of brain-derived neurotropic factor by IUS exposure. However, mebicar or ginsenoside Rg1 prevented elevation of serum corticosterone and secretion of proinflammatory cytokines from splenocytes due to IUS exposure. <B><I>Conclusions:</I></B> This study suggests that mebicar or ginsenoside Rg1 may have little preventive effect on neurobehavioral disruption by IUS exposure, but mebicar or ginsenoside Rg1 shortened the lasting duration of the anxiety caused by exposure to a novel environment. The anti-stress effect of mebicar and ginsenoside Rg1 may be restricted in peripheral stress responses.</P>
서창재(Chang-Jae Seo),천장율(Chang-Yul Cheon),정용식(Young-Seek Chung) 한국전자파학회 2010 한국전자파학회논문지 Vol.21 No.11
이동 통신 서비스가 확대됨에 따라 인접 기지국 간의 간섭 문제가 증가하게 되었으며, 그에 따라 CDMA 시스템의 능동 상호 변조 왜곡(AIMD: Active Inter-Modulation Distortion)뿐만 아니라 수동 상호 변조 왜곡(PIMD: Passive Inter-Modulation Distortion)에 대한 문제도 기지국 안테나 시스템 설계 시 고려되어야 한다. 본 연구에서는 기지국 안테나에 사용되는 도체와 도체 조립에 있어 국부적인 전류 비선형을 유발하는 전류 밀도의 특성을 분석하였고, 전류 비선형성을 낮추기 위한 방법을 연구하였다. 이를 통하여 안테나 구조의 도체-도체 결합을 위한 넛트의 간격, 면적 등이 미치는 영향을 분석하여 수동 상호 변조 왜곡의 개선 방향을 제안한다. As the mobile services have been increased, the PIMD(Passive Inter-Modulation Distortion) as well as the active-IMD of the CDMA system should be considered for the design of base station antenna systems, because they have an interference of the neighboring base stations. In this paper, in order to reduce the nonlinearity of current caused by the local point contact, we have investigated an influence of the combination of nuts, contact torque(kgf.cm), and the contact area on the PIMD. We propose the improvement techniques of PIMD by investigating the effects of the distance of nuts, the contact area, and the type of nuts.
장미윤(Mi Yoon Chang),전대준(Dae Joon Cheon),오동렬(Dong Yul Oh),이용성(Yong Sung Lee),이상훈(Sang Hun Lee) 대한약학회 1999 약학회지 Vol.43 No.6
Human and bovine dopamine transporters (DAT) demonstrate discrete functional differences in the dopamine (DA) transport and cocaine binding. The functional analyses on the chimeras of human and bovine DAT have revealed that the region from the 133rd to 186th residue (encompassing the 3rd transmembrane domain(TM)) is responsible for the substrate transport and cocaine binding. The present studies have been done to find out the specific amino acid(s) which is essential for the binding of cocaine to DAT by interchanging the amino acids in that region between human and bovine DAT. When isoleucine, the 152nd residue of chimera B3 (bovine DAT sequence), was transformed back to valine, the human DAT residue at the identical position, the cocaine binding was remarkably recovered to 98% of the human DAT values. In addition, the cocaine binding of the human DAT was decreased by 57% by substituting isoleucine for valine at position 152. When isoleucine at position 152. When isoleucine at position 152 of the chimera B3 was converted to the other amino acids to provide an possible molecular basis for the functional role of the 152nd residue, only the conversion to alanine among the amino acids tested significantly increased the cocaine binding by 34%, but these effects were not as much as those by the conversion to valine. In conclusion, valine at position 152 is a crucial amino acid for the interaction of cocaine to the DAT.
Investigation of a Method for RF Circuits Analysis Based on Electromagnetic Topology
Park, Yoon-Mi,Chung, Young-Seek,Cheon, Chang-Yul,Jung, Hyun-Kyo The Korean Institute of Electrical Engineers 2009 Journal of Electrical Engineering & Technology Vol.4 No.3
In this paper, electromagnetic topology (EMT) was used to analyze the electromagnetic compatibility (EMC) of RF circuits including passive and active components. It is difficult to obtain usable results for problems relating to electromagnetic coupling in complex systems when using conventional numerical or experimental methods. Thus it is necessary to find a new methodology for analyzing EMC problems in complicated electromagnetic environments. In order to consider the nonlinear characteristics of active components, a SPICE diode model was used. A power detector circuit and the receiver circuit of a radio control (RC) car were analyzed and experimented in order to verify the validity of this method.