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임펄스전류에 의한 토양이온화에 따른 접지저항의 동적 특성
최용태(Yong-Tae Choi),이복희(Bok-Hee Lee) 한국조명·전기설비학회 2018 조명·전기설비학회논문지 Vol.32 No.8
In this paper, experimental results are presented to analyze the dynamic characteristics of ground resistance due to soil ionization under impulse currents. Soil ionization phenomenon occurred around grounding electrode under impulse currents was analyzed based on the parameters such as potential rise-current (V-I) curves, ground resistance depending on electric field, and ionization growth length. As a result, when soil ionization was very little or did not occur, the potential rise is proportional to the current flowing through the grounding electrode. However, in the case where soil ionization occurred, ground resistance was significantly reduced by soil ionization due to impulse current, and the V-I curves appeared as regression shape of a cross-closed loop. Ionization, which occurred from soil near the surface of a hemispherical grounding electrode was developed toward radial direction, in the case of high-resistivity gravel, the reduction of ground resistance due to ionization was significantly greater than that in sand or loess.
최용태(Yong-Tae Choi),나성웅(Sung-Woong Ra) 한국산업정보학회 2014 한국산업정보학회논문지 Vol.19 No.3
나로호 발사임무에서 추적장비에서 취득된 실시간 정보는 발사통제시스템의 처리를 거쳐서 비행안전 및 비행상태 감시 관련 운용자에 공급되어진다. 또한, 처리된 발사체의 위치정보는 각 추적 장비들의 추적 실패 시 재추적 시도를 위한 추적연동정보로 공급됨과 동시에 비행안전 감시의 목적으로 사용되어진다. 본 논문에서는 추적임무 수행에 가장 중요한 역할을 수행하는 추적연동정보 처리기능의 설계를 제안하였다. 가용한 모든 발사체 위치정보를 수집, 처리후 최적 위치정보를 선정하고 처리 과정에서 발생된 시간 지연 성분을 보상하여 각 추적시스템으로 분배한다. 추적연동정보의 처리의 정확성을 위하여 표준시각에서 추출한 25 ms 주기의 타임틱 신호를 기준으로 모든 처리 모듈의 동작이 동기화 된다. 제안한 방법의 정확도를 검증하기 위하여 레이더를 통해 수신한 위치정보와의 비교를 수행하였으며 그 오차는 평균 0.01도 이하로 나타났다. In KSLV-I launch mission, real-time data from the tracking stations are acquired, processed and distributed by the Mission Control System to the user group who needed to monitor processed data for safety and flight monitoring purposes. The processed trajectory data by the mission control system is sent to each tracking system for target designation in case of tracking failure. Also, the processed data are used for decision making for flight termination when anomalies occur during flight of the launch vehicle. In this paper, we propose the processing mechanism of slaving data which plays a key role of launch vehicle tracking mission. The best position data is selected by predefined logic and current status after every available position data are acquired and pre-processed. And, the slaving data is distributed to each tracking stations through time delay is compensated by extrapolation. For the accurate processing, operation timing of every processing modules are tiggered by time-tick signal(25ms period) which is driven from UTC(Universial Time Coordinates) time. To evaluate the proposed method, we compared slaving data to the position data which received by tracking radar. The experiments show the average difference value is below 0.01 degree.
쑥뜸자극(刺戟)이 한냉(寒冷)스트레스로 유발(誘發)된 면역(免疫) 및 갑상선(甲狀腺) 기능저하(機能低下)에 미치는 영향(影響)
주태청,최용태,Choo Tae-Cheong,Choi Yong-Tae 대한침구의학회 1998 대한침구의학회지 Vol.15 No.2
In order to study the effect of direct moxibustion on depressed immune response and thyroid hormone in rats exposed to cold stress, Sprague-Dawley male rats were put in the horizontal refrigerator by $-10^{\circ}C$ for 14 days and thereafter $-18^{\circ}C$ for 11 days(control group). Sample I group was treated by daily direct moxibustion to bilateral Shinsu(BL23) from the 22nd day to the 25th day for 4 days under the same condition with the control group. Sample II group was treated by daily direct moxibustion to bilateral non-acupoints near the root of the tail from the 22nd day to the 25th day for 4 days under the same condition with the control group. And RBC, WBC, CD4+ T cell count, T3, T4 and TSH were measured. The results were as follows; 1. RBC increased with statistical significance in the sample I and sample II groups compared with the control group. 2. WBC increased with statistical significance in the sample I group, but there was not any significance in the sample II group compared with the control group. 3. Lymphocyte increased with statistical significance both in the sample I and sample II groups compared with the control group. 4. CD4+ T cell count increased with statistical significance both in the sample I and sample II groups compared with the control group. 5. T3, T4 and TSH increased respectively with statistical significance in the sample I and sample II groups compared with the control group.