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농업용(農業用) 석유기관(石油機關)의 연료소비율(燃料消費率)에 관(關)한 연구(硏究)
신건성 ( Kun Sung Shin ) 한국농공학회 1975 韓國農工學會誌 : 전원과 자원 Vol.17 No.2
This study was attempted to investigate the changes of specific fuel consumption, compression pressure and power output, consequently to obtain basic data on farm kerosene engine. The samples which are used in this study are a 4 cycle water cooled korosene engine for the use of K6-CT83 power tiller and a 4 cycle air-cooled kerosene engine for the use of G5L-3A water pump. The Korean Industrial Standards (K.S)KS-B 6002 "Test code of small internal combustion engine" was referred in carrying out this study, and its results are as follows. 1. According to load increasing, the speific fuel consumption of the engines generally decreases, however, in case of 10% over-loading it increases. 2. As a result of full load consecutive operation, according to passing of operating time, the amount of wear generally increases, consequently the speific fuel consumption also increases, and inversly the compression pressure decreases. 3. The changes of specific fuel consumption and compression pressure were closely related with time of piston ring exchange, and periodically about 100 hours the engines show the increase of specific fuel consumption and the decrease of compression pressure. 4. After about 300 hours, although the engine had new piston rings, the specific fuel consumption increase, consequently the engine needs boring. In actual use, it is impossible to operate consecutively on full load, therefore the boring time of engine is expected to come later.
항공 통신 기술 : 하이브리드 알고리즘을 이용한 Wi-Fi 기반의 실내 측위 시스템
신건식 ( Geon-sik Shin ),신용현 ( Yong-hyeon Shin ) 한국항행학회 2015 韓國航行學會論文誌 Vol.19 No.6
위치 정보를 제공하는 대표적인 측위 기술은 GPS다. 이 기술은 밀도가 높은 도심이나 숲, 그리고 실내와 같은 음영지역에서는 동작하지 않는 단점이 있다. 본 논문은 실내의 AP로 부터의 Wi-Fi 신호의 세기를 이용하여 보다 정확한 단말의 위치를 추정하게해주는 실내 측위 하이브리드 알고리즘을 제안한다. 사용자의 위치를 결정하기 위해 건물 구조, 사람, 거리 등 다양한 환경에서 측정한 RSSI (received signal strength indicator) 값을 이용하여 측정 환경에 맞는 가장 적절한 경로손실모델을 수립한다. 이러한 경로손실 모델에서 구해진 경로손실지수를 환경에 따라 변화시켜, AP로 부터 얻은 측정값을 이용하여 REKF (robust extended kalmanfilter)와 PF (particle filter) 알고리즘을 사용하여 단말기의 위치를 추정하게 된다 . 보다 더 정확한 위치 추정을 위해 하나의 측위방식만을 사용하지 않고, 실험을 통하여 구해진 임계값에 따라 어떠한 측위방식을 사용할 것인지를 결정한다. 제안한 하이브리드알고리즘을 이용하여 실험한 결과 기존의 단일 측위 방식 보다 평균 17% 성능이 향상 되는 것을 볼 수 있었다. GPS is the representative positioning technology for providing the location information. This technique has the disadvantage that does not operate in the shadow areas, such as urban or dense forest and the interior. This paper proposes a hybrid indoor positioning algorithm, which estimates a more accurate location of the terminal using strength of the Wi-Fi signal from the indoor AP. To determine the location of the user, we establish the most appropriate path loss model for the measurement environment. by using the RSSI value measured in a variety of environment such as building structure, person, distance, etc. The path loss exponent obtained by the path loss model is changed according to the environment. REKF, PF estimate the position of the terminal by using measured value from the AP with path loss exponent. For more accurate position estimation, we select positioning system by the value of threshold measured by experiments rather than a single positioning system. Experimental results using the proposed hybrid algorithm show that the performance is improved by about 17% than the conventional single positioning method.
Berberine이 백서의 6-Hydroxydopamine-유도 파킨슨병 모델에서의 L-DOPA 요법에 미치는 영향
신건성(Kun Seong Shin),권익현(Ik Hyun Kwon),최현숙(Hyun Sook Choi),임성실(Sung Cil Lim),황방연(Bang Yeon Hwang),이명구(Myung Koo Lee) 대한약학회 2011 약학회지 Vol.55 No.6
Isoquinoline compounds including berberine enhance L-DOPA-induced cytotoxicity in PC12 cells. In this study, the effects of berberine on L-DOPA therapy in unilateral 6-hydroxydopamine (6-OHDA)-induced rat models of parkinsonism were investigated. Rats were prepared for the models of Parkinson's disease by 6-OHDA-lesioning for 14 days and then treated with L-DOPA (10 mg/kg) with or without berberine (5 and 30 mg/kg, i.p.) for 21 days. Treatment with berberine (5 and 30 mg/kg, i.p.) showed a dopaminergic cell loss in substantia nigra of 6-OHDA-lesioned rats treated with L-DOPA: 30 mg/kg berberine was more intensive neurotoxic. The levels of dopamine were also decreased by berberine (5 and 30 mg/kg) in striatum-substantia nigra of 6-OHDA-lesioned rats treated with L-DOPA. These results suggest that berberine aggravates cell death of dopaminergic neurons in L-DOPA-treated 6-OHDA-lesioned rat models of Parkinson's disease. Therefore, the long-term L-DOPA therapeutic patients with isoquinoline compounds including berberine may need to be checked for the adverse symptoms.
신건수(Shin, Gun-Soo) 대한건축학회 2014 대한건축학회논문집 Vol.30 No.5
This study examines two aspects of the architectural theory and works of Louis-Pierre Baltard (1764?1846), famous for his neoclassical architecture. Firstly, he was a theorist and professor at Ecole des Beaux-Arts, supporting the classical expression of architecture in opposition to the neo-Gothic style, which was a rising trend at that time. Secondly, he was a functionalist regarding architectural organization, particularly in penitentiary architecture, in which domain he was one of the first specialists. Our standpoint is that this disaccord was not an internal contradiction on the part of the architect but a difference in two sensibilities corresponding to two external conditions of his architectural work. The aim of the study is to determine the ways in which the early 19th century fostered two architectural currents?the classical grammar of exterior expression and the functional organization of architectural space?that preceded the emergence of the styles as neo-Gothic, Art nouveau in the late 19th century and notably the Modern Movement in the early 20th century.