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島原正男,김종성 대한건축학회 1973 建築 Vol.17 No.4
일본에는 일본음향학회(Acoustical Society of japan)가 있으며 그 회원은 현재 2,000이 좀 모자랍니다. 그속에 건축음향연구위원회라는 모임이 있어서 이 분야의 연구자는 달마다 한번씩 모여 연구회를 열고 있읍니다. 현재 본인이 위원장을 맡고 있읍니다. 그밖에 한해에 두번씩 열리는 대회나 달마다 발행되는 학회지 (JAST)에도 가끔 건축음향에 관한 논문이 발표됩니다. 한편 일본건축학회 (Archi-tectural Institute of Japan)에도 음향을 전공하는 집단이 있으나 그 회원의 대부분은 음향학회의 구성원과 공통되는 것 같읍니다.
불평형 전원 조건에서 MMC 기반 HVDC 시스템 순환전류에 관한 연구
도원석(Won-Seok Do),김시환(Si-Hwan Kim),김태진(Tae-Jin Kim),김래영(Rae-Young Kim) 대한전기학회 2015 전기학회논문지 Vol.64 No.8
This paper presents a study of circulating current of modular multi-level converter (MMC) based a high voltage direct current (HVDC) system under unbalanced grid conditions. Due to the connection of a dependent DC source in each phase, the MMC system inherently generates the power ripple of double-line-frequency components in the AC-side and as a result, the additional sinusoidal current named circulating current flows through the each arm. Reliability improvement of HVDC system under an unbalanced grid condition is one of the important criteria. Generally, the modeling of the circulating current is based on the power relation between DC-side and AC-side. However, the method is not perfectly matched in the MMC system due to the difference of the structural characteristic. In this paper, improved modeling method of circulating current is proposed, which is based on the inner arm power. The proposed method is verified by several simulations to have good agreement of the circulating current components.
도원석,김경호,김갑성,Do, Won-Seok,Kim, Kyung-Ho,Kim, KaP-sUNG 대한침구의학회 2001 대한침구의학회지 Vol.20 No.4
Objective : The purpose of this study is to investigate the effects on WBC counts and each differential of neutrophils, lymphocytes, monocytes in whole blood sample of each experimental Aqua-acupuncture treated mice groups PCortex Ulmi Pumilae(CU), Ramulus Cinnamomum(RC), Radix Achyranthes(RA), Apitoxin(BV), Calculus Bovis Fel Ursi Moschus compound(BUM). Materials & Method : All the BALB/c mice used in this study were bred and maintained in our pathogen-free mouse facility and were 6 weeks of age at the start of the experiment. The experimental model of arthritis was induced by injecting 300${\mu}g$/kg LPS to all mice knee joint. The each of Aqua-acupuncture(Cortex Ulmi Pumilae, Ramulus Cinnamomum, Radix Achyranthes, Apitoxin, Calculus Bovis Fel Ursi Moschus compound) was injected into GB34(陽陵泉) of mice groups every other day for 6 times. And the WBC counts and each differential of neutrophils, lymphocytes, monocytes were measured at the 3rd, 7th and 14th day after LPS injection. Results : 1. The WBC counts were significantly decreased compared with the control(CON) group in every Aqua-acupuncture groups at all days. And at the 14th day, BV & BUM groups were more significantly decreased than RA group. 2. The Neutrophil's ratio was significantty increased compared with the CON group in CU & RC groups at the 3rd day and RC group was more significant than CU group. But at the 7th and 14th day, every Aqua-acupuncture groups were significantly increased compared with the CON group and at the 7th day, RC group was more significant than RA, BV & BUM groups and at the 14th day, RC, BV & BUM groups were more significant than RA group. 3. The Lymphocyte's ratio was significantly decreased compared with the CON group in RC group at the 3rd day. At the 7th day, CU, RC & BV groups were significantly decreased compared with the CON group. At the 14th day, every Aqua-acupuncture groups were significantly decreased compared with the CON group and RC group was more significant than RA group, 4. The Monocyte's ratio was significantly decreased compared with the CON group in every Aqua-acupuncture groups at the 7th day. At the 14th day, BV & BUM groups were significantly decreased compared with the CON group. Conclusion : According to the above results, it was concluded that CU & RC groups were more effective at the early period of this experiment, and at the latter period, BV & BUM groups were more effective than others. RA group was less effctive than others.