http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
김경엽,오상현,Kim, Kyung-Yup,Oh, Sang-Hyun 한국유체기계학회 2001 한국유체기계학회 논문집 Vol.4 No.4
The field tests on the waterhammer were carried out for PalDang intake pumping station of the metropolitan water supply 5th stage project. The pumping station was equipped with the pump control valve as the main surge suppression device and the surge relief valve as auxiliary. However, the pump control valve had not been early controlled in the planned closing mode, and the slamming occurred to the valve which abruptly closed during the large reverse flow. Because the pressure wave caused by the pump failure was superposed on the slam surge, the upsurge increased so extremely that the shaft of the valve was damaged. It was desirable that the surge relief valve was installed in the pumping station or near the pump exit for the delay of response. After reforming the oil dashpot of the pump control valve, the sliming disappeared and the measured pressure was in fairly good agreement with the results of simulation. In case of three pumps for ${\phi}2,600$ pipeline being simultaneously tripped, the pressure head in the pumping station increased to 95.6 m, and the upsurge caused by the emergency stop of four pumps for ${\phi}2,800$ pipeline was 89.6m. We concluded that the pumping station acquired the safety and reliability for the pressure surge.
김경엽,유택인,Kim, Kyung-Yup,Yu, Teak-In 한국유체기계학회 2000 한국유체기계학회 논문집 Vol.3 No.4
The numerical study on the waterhammer was carried out for the intake pumping station of the metropolitan water supply 6th stage project. Because the waterhammer problems as a result of the pump power failure were the most important, these situations were carefully investigated. The surge tank and the stand pipes effectively protected the tunnels md the downstream region of pipeline from the pressure surge. In case the moment of inertia of the pump and motor was above $5080\;kg{\cdot}m^2$, the column separation did not occur in the pipeline between the pumping station and the inlet of 1st tunnel. As the moment of inertia increased, the pressure surges decreased in the pipeline conveying raw water. The pump control valve was chosen as the main surge suppression device for the intake pumping station. After power failure, the valve disc should be rapidly closed in 2.5 seconds and controlled the final closure to 15 seconds by the oil dashpot. If the slamming happened to the pump control valve, there was some danger of this system damaging. As the reverse flow through the valve increased, the upsurge extremely increased.
김경엽(Kyung-Yup Kim),서상호(Sang-Ho Suh),이정우(Jung-Woo Lee),노형운(Hyung-Woon Roh),김상균(Sang-Gyun Kim) 한국유체기계학회 2001 유체기계 연구개발 발표회 논문집 Vol.- No.-
An extensive range of pumping facilities are employed in the regional water supply system in metropolitan areas, and optimization and the systematic combination of the pump facilities have direct bearing on the stability and economy of the water supply system concerned. These systems must be able to guarantee stability, efficiency and offer high reliability. Preparation of metropolitan area regional water supply system construction project must include a basic plan which takes into account the suitability of pumping facilities to be used, the environment in which facilities will be installed, man-power requirements and basic operational and management policies. This paper contains over-all analysis of the management of metropolitan area regional water supply systems as like Jayang, Paldang 1st pump station. In the study, it aims to prepare counterplan which will be operated and managed the pump upon the operational conditions and to suggest the proposal for water facilities codes to decides total head of pump in Korea.
기생용량을 고려한 원격 RF 센서 시스템의 수학적 모델링
김경엽(Kyung-yup Kim),이준탁(John-tark Lee) 한국정보기술학회 2008 한국정보기술학회논문지 Vol.6 No.5
In this paper, Passive Telemetry RF Sensor System considering stray parameter is proposed. Passive Telemetry RF Sensor System using inductive coupling is composed of passive components such as R, L and C which have stray parameters in the range of high frequency. In case that Passive Telemetry RF Sensor system operates disregarding stray parameters in high frequency, it is difficult to expect high accuracy of reading sensor. So, in order to improve the accuracy of reading sensor, the mathematical model considering stray parameters is proposed. The efficiency of derived model considering stray parameters is verified by comparing the measured output voltage with simulated output voltage.
RLS 알고리즘을 이용한 원격 RF 센서 시스템의 시변 파라메타 추정
김경엽(Kyung-yup Kim),이준탁(Joon-tark Lee) 한국정보기술학회 2007 한국정보기술학회논문지 Vol.5 No.1
In this paper, time-varying parameter of passive telemetry RF sensor system is estimated using RLS(Rescursive Least Square) algorithm. In order to overcome the problems such as power limits and complication that general RF sensor system including IC chip has, the principle of inductive coupling is applied to model sensor system. The model parameter is rearranged for applying RLSalgorithm based on mathematical model to the derived model using inductive coupling principle. Time variant parameter of rearranged model is estimated using forgetting factor, and in case measured data is contaminated by noise and modelling error, the performance of RLS algorithm characterized by the convergence of squared error sum is verified by simulation.
Unscented Kalman Fiter를 이용한 원격 RF 센서 시스템의 파라메타 추정기법
김경엽(Kyung-Yup Kim),이준탁(John-Tark Lee) 한국지능시스템학회 2008 한국지능시스템학회 학술발표 논문집 Vol.18 No.1
본 연구는 UKF Algorithm올 이용한 정전용량형 원격RF센서시스템을 개발하였다. 원격 RF센서 시스템이란 wireless, implantable 그리고 batterless을 만족하는 센서 시스템을 의미한다. 기존의 원격 RF센서 시스템은 보편적으로 집적회로 타입을 채택하지만, 그 구조의 복잡성과 전력소모의 제약을 받는다. 이러한 제약을 해결하기 위해 본 연구에서는 R, L 그리고 C만으로 구성되어있는 유도결합원리를 이용한 원격 RF센서 시스템을 제안하였다. 제안된 RF 센서 시스템은 압력 혹은 습도와 같은 환경의 변화를 정전용량 값으로 측정할 수 있으며 센서의 정전 용량 값을 측정하기 위해 비선형시스템의 파라메타추정에 적합한 Unscented Kalman Filter(UKF) 기법을 채택하였다. UKF 기법을 이용하기 위해 제안된 시스템은 페이저법을 사용하여 수학적으로 모델링되었다. 마지막으로, 제안된 UKF 알고리즘을 이용한 원격 RF센서시스템이 잡음환경에서도 정전용량값을 비교적 정확하게 추정가능함을 확인하였다.
RLS 알고리즘을 이용한 원격 RF 센서 시스템의 정전용량 파라메타 추정
金璟燁(Kyung-Yup Kim),李浚柝(John-Tark Lee) 대한전기학회 2008 전기학회논문지 Vol.57 No.5
In this paper, Capacitive Telemetry RF Sensor System using Recursive Least Square (RLS) algorithm was proposed. General Telemetry RF Sensor System means that it should be "wireless", "implantable" and "batterless". Conventional Telemetry RF Sensor System adopts Integrated Circuit type, but there are many defects like complexity of structure and the limitation of large power consumption in some cases. In order to overcome these disadvantages, Telemetry RF Sensor System based on inductive coupling principle was proposed in this paper. Proposed Telemetry RF Sensor System is very simple because it consists of R, Land C and measures the changes of environment like pressure and humidity in the type of capacitive value. This system adopted RLS algorithm for estimation of this capacitive parameter. For the purpose of applying RLS algorithm, proposed system was mathematically modelled with phasor method and was quasi-linearized. As two parameters such as phase and amplitude of output voltage for estimation were needed, Phase Difference Detector and Amplitude Detector were proposed respectively which were implemented using TMS320C2812 made by Texas Instrument. Finally, It is verified that the capacitance of proposed telemetry RF Sensor System using RLS algorithm can be estimated efficiently under noisy environment.