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구동 전동기 입력 전류 및 전력신호에 의한 전동 게이트밸브 진단연구
박종호,이성노,성게용,조두연 충남대학교 산업기술연구소 1999 산업기술연구논문집 Vol.14 No.2
The motor-operated valves are used extensively within nuclear power plants in safety-related and balance-of-plant systems and located in almost all plant fluid systems. Their failures have resulted in significant plant maintenance efforts. More important, the operational readiness of nuclear plant safety-related systems has often been affected by MOV degradation and failure. The performance of motor-operated valves should be evaluated to ensure the nuclear safety. It will be accomplished by understanding the state of the art of the diagnostic method and developing the appropriate new methodology to evaluate the measuring parameters to predict the valve performance Measured and evaluated were the changes of the motor current signature taken by simulating the abnormal conditions on the gate MOVs used extensively in the nuclear power plants. Based on the evaluation results, the conclusion can be as follows: 1.The DC signature of motor power shows more sensitive than the current. Both of them have similar behavior during the simulation. 2.The changes of the valve stroke and magnitude with appropriate management of the signature occured during the stroke can be used as an index showing the valve failure and degradation. 3.The diagnosis of valve by simultaneous use of the valve current and power is more useful than the method using the motor current only.
Design of gCRM system integrated with LBS
Park, Key-Ho,Jung, Jae-Gon,Hwang, Myung-Hwa Korea Spatial Information Society 2002 한국공간정보학회지 Vol.10 No.4
The success of gCRM depends on the availability of adequate, real-time data about customers' location and the provision of diverse value-added services utilizing it. In the existing gCRM systems, however, it seems that the positional precision of customers' location is very low, and further that the services based on real-time location data are not provided. In order to overcome these weaknesses and extend the limited scope of gCRM, we suggest a new design of gCRM system integrated with LBS. We also describe in some detail the system prototype for such an integration.
박기호(Key-Ho Park),안재성(Jae-Seong Ahn),이양원(Yang-Won Lee) 대한지리학회 2005 대한지리학회지 Vol.40 No.3
이 연구는 GPS 수신기를 통해 수집된 개인통행자료를 이용하여 통행패턴의 시공간적 특성을 다양한 그래픽으로 요약하고 탐색적 분석을 가능케하는 지리적 시각화 환경을 제안하고 이를 구현 및 평가하는 것을 목적으로 한다. 이 연구에서는 시공간입방체(space-time cube)를 바탕으로 시간지리학 개념을 시각적으로 표현하였으며, 시간산포기둥(temporal dispersion cylinder), 평행평면그림(parallel plane plot)과 같은 부가적인 시각화 도구의 구현을 통해 개인통행패턴의 시공간적 속성 및 이동경로 주위지역의 사회경제적·자연적 속성을 함께 탐색할 수 있도록 하였다. 또한 사용자와의 상호작용을 통해 개인통행자료에 포함되어 있는“언제”, “어디에서”, “무엇을”이라는 세 가지 정보요소들을 동적으로 탐색 및 질의할 수 있는 환경을 제공한다. This study attempts at prototyping and evaluating a geovisualization tool that summarizes and explores human activity patterns using spatio-temporal trajectory data collected from GPS receiver. A set of core conceptualization developed in “time geography” is successfully represented by our prototype based on the notion of “space-time cube.” The notions of “temporal dispersion cylinder” and “parallel plane plot” are also implemented to allow further analyses of human activity pattern on the space-time trajectory. The capabilities of the geovisualization environment we proposed include the interactive and dynamic functions that support a variety of explorations on the three components of spatio-temporal data : space(where), time(when), and object(what).
Mi Kyung Park,Hyoung-ho Mo,Jeong Gyu Kim,Yoo Han Song,Joon-Ho Lee,Key-il Shin,Kijong Cho 한국응용곤충학회 2009 한국응용곤충학회 학술대회논문집 Vol.2009 No.05
Two cherry tomato plant cultivars (Lycopersicon esculentum Miller, cultivars ‘Koko’ and ‘Pepe’) were supplied with high (395 ppm), medium (266 ppm) and low (199 ppm) concentrations of nitrogen to determine the influence of nitrogen fertilization on development, cultivar preference and honeydew production by greenhouse whiteflies, Trialeurodes vaporariorum (Westwood) (Hemiptera: Aleyrodidae). The nitrogen, protein, andchlorophyll content of tomato leaves were higher in the high nitrogen supplied plants than in the medium or low nitrogen supplied plants, but the sugar content showed an inverse relationship. The developmental times of eggsand nymphs decreased as the nitrogen concentrations increased in both cultivars. The preference of T. vaporariorum was compared by counting the number of eggs deposited on leaves in choice and non-choice tests. In the non-choice test, no significant nitrogen treatment effects were observedbut the upper plant stratum was preferred for egg laying. In the choice test, there were significant main effects of cultivar and nitrogen concentration. T. vaporariorum laid eggs more on leaves of plants with higher nitrogen at the upper stratum. In both experiments, T, vaporariorum preferred the ‘Koko’ cultivar to the ‘Pepe’ cultivar. The honeydew production of T. vaporariorum nymphs increased with decreasing nitrogen treatment concentrations. The largest honeydew production was detected in the ‘Pepe’ cultivar grown at low nitrogen concentration. It is concluded that cultivar ‘Pepe’ had an advantage over ‘Koko’ in term of T. vaporariorum management program in tomato greenhouses.
Jung-Joon Park,Joon-Ho Lee,Key-Il Shin,Sung Eun Lee,Kijong Cho 한국응용곤충학회 2011 한국응용곤충학회 학술대회논문집 Vol.2011 No.05
two different sizes of yellow sticky traps (small trap: 9.6×8.0cm; large trap: 9.6×16cm) for sampling greenhouse whitefly (GHWF), Trialeurodes vaporariorum (Westwood), adults in four commercial cherry tomato greenhouses. The patch size of GHWF immatures between plants was also estimated using visual counts. Two variogram models were fitted to the empirical variograms developed from the data collected by each sampling method. All the variograms reached the sill indicating the presence of spatial dependence among the spatial data obtained by the two sampling methods. For GHWF adults on sticky traps the range of variogram (a measure of attractive distance) was not different between the two trap sizes. This result indicated that the attractive distances of the two different yellow sticky traps were very similar. The ranges of the variograms for the visual count of immatures on plants were always less than those for adults, indicating that the attractive distance of the traps for GHWF adults extends beyond the patch size for immatures on cherry tomato plants. These data have implications for developing sampling plans for the management of GHWF in tomato greenhouses.