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최창민,선종주,김석민,정재한,이승엽,최원우,홍진우,박성욱,정우상,문상관,박정미,고창남,조기호,김영석,배형섭,Choi, Chang-Min,Sun, Jong-Joo,Kim, Seok-Min,Jung, Jae-Han,Lee, Seung-Yeup,Choi, Won-Woo,Hong, Jin-Woo,Park, Seong-Uk,Jung, Woo-Sang,Moon, Sa 대한한방내과학회 2007 大韓韓方內科學會誌 Vol.28 No.4
Objectives : This study was conducted to assess the effect of Uhwangchungsimwon on the autonomic nervous system. Methods : Eligible subjects were enrolled from healthy people in their 20s-30s. They were divided into two groups, the UC group (n=22) and the control group (n=20). We monitored ECG from 14:00 to 18:00 in both groups. In the UC group, subjects were administered UC at 15:00. HRV analysis was conducted at 14:00, 16:00, and 17:00 for 512 seconds. Results : The degree of LF/HF ratio change was significantly higher in the UC group at 1 hour after administration. Conclusion : We suggest Uhwangchungsimwon may be useful for stabilization of the autonomic nervous system by activating parasympathetic nerve in healthy people.
계통 연계형 3-레벨 인버터 시스템을 위한 LCL-필터 설계 방법
박준영(Joon Young Park),김석민(Seok-Min Kim),서승규(SeungGyu Seo),박성수(Seong-Soo Park),이교범(Kyo-Beum Lee) 한국전기전자학회 2017 전기전자학회논문지 Vol.21 No.2
본 논문은 계통 연계형 3-레벨 인버터 시스템을 위한 LCL-필터 설계 방법을 제안한다. 최근 풍력 및 태양광과 같은 신재생에너지 발전 시스템을 위한 3상 PWM 인버터의 수요가 증가하고 있다. 이러한 PWM 인버터는 스위칭 동작에 의해 발생하는 고조파 성분을 제거하기 위하여 LCL-필터를 거쳐 계통과 연결된다. 필터 설계에 관한 다양한 연구가 진행되었지만 최소의 사이즈로 목표하는 고조파 제거 성능을 얻기 위해서는 해당 PWM 인버터의 스위칭 방법을 고려한 필터 설계 방법이 요구된다. 본 논문은 공간 전압벡터 변조기법(SVPWM)에 최적화된 LCL-필터 설계방법을 제시한다. 시뮬레이션과 실험 결과를 통해 제안하는 방법으로 설계된 LCL-필터의 성능을 검증한다. This paper proposes a design method of an LCL-filter for grid-tied three-level inverter systems. The demand for three-phase PWM inverters in applications such as wind or solar power generation systems has been increase in recent years. To reduce harmonic components caused by switching operation, such inverters are connected to the grid via an LCL filter. Although there are research results for designing LCL-filter, the modulation method should be fully considered to make the filter perform desired cancellation ability with minimized size. This paper presents the design methodology for an LCL-filter that is optimized for SVM switching operations. The simulation and experimental results verify the validity of the LCL-filter designed with proposed method in this paper.
金義天(Jun Eui-Cheon),金錫珉(Kim Seong-Min),李雪威(Li Xue-Wei) 조선대학교 지식경영연구원 2004 지역개발연구 Vol.9 No.2
This article researched the present conditions, the course of increase and the basic policies of China's anti-dumping measures. The causes of China's anti-dumping measures are as follows; First. the uneasiness of economic problems transferring to social problems. Second, the protection of consumers' benefit in view of long-term period. Third, the promotion for investment circumstance of FDI firms to China. The Causes of dumping in China can be attributable to the legal problems. organizations limited man power and overcompetition for the advancement of multilateral enterprises to China's domestic market. China is sure to make a betterment and improve the related regulations, but to accomplish these objects. all regulations should be improved for the observance of WTO anti-dumping agreement. and then China's enterprises must pursue co-existence with foreign firms through the strategic cooperation.