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남기한(Ki Han Nam),유계현(Kye Hyeon Ryu),유요한(Yo Han You) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Calibration facility at high Reynolds number flow was designed and fabricated, for calibrating the flowmeter used for feedwater flow measurement in a nuclear power plant. Conditions of the feedwater flow are under the temperature 230 ℃ and the pressure 8 M Pa. Four ultrasonic flowmeters, which have 3000 m3/h maximum flowrate respectively, were calibrated against both gravimetric flow calibrator and pipe type ball prover. We have achieved the maximum flowrate 12000 m3/h with parallelly connected four ultrasonic flowmeters. To get the high Reynolds number flow, the fluid temperature was controlled up to 90 ℃. Then we can get Reynolds number 2.5x107, which was coincide with that of APR 1400(Advance Power Reactor 1400 ㎿) nuclear power plant model. Two different principle flow calibrator, gravimetric system and ball prover, which have the traceability from national standard of mass and volume respectively, were crossly used and checked for the estimation of ultrasonic flowmeters. The target uncertainty of this calibrator was 0.08 %, which was estimated with ISO recommendations. For increasing the reliability of estimated uncertainty, the inter comparison with other calibrator at high Reynolds number was planned. The system will be apply to solve the MUR(Measurement Uncertainty Recapture) issue in feedwater flow measurement.
京畿地域에 있어서 郡治聚落의 變貌에 關한 硏究 : 竹山邑을 中心으로
南基漢 동국대학교 지역환경연구소 1982 地域環境 Vol.- No.1
The purpose of this study is to clarify the settlement characteristic by analyzing the process of central village in Jugsan district. The result is summarized as follows. Jugsan is located in the in land of the southern Gyunggido and it has been inhabited since the ancient times. But its regional name and function have periodically changed from Silla to Chosun Dynasty. Jugsan has developed into the central village. Koguryo Dynasty and it had govemmental and military functions of the Jugsan County. In order to perform the functions effectively, there added also the functions of transportation and communication for the ruling of this area and consolidation a mong the region. And the function of transportation and communication had developed throughout Koryo and Yi Dyansty. The piedmont site from the north to the south between the central village and the station of Bunhaeng had restricted the settlement location. And therefore by the strengthened road function as a line form, the function of the dike village and the Strassen Dorf has been deposited in Jugsan. The regional nave of Jugsan County had redently changed into Jugee-myun when it had been united into Ahnsung County in 1914. In order to beautify the name of Jugee-myun, the name has changed into Eejug-myun. But the tradition of the central village has succeeded in nowadays to that of Jugsanri. In the office place for dominating the administration of Eejug-myun new facillities were filled instead of the ancient administrational office (Dong-hun). And at the same time the police station, the post offece and the primary school were built near the place of Dong-hun. Though the range of the jurisdiction had become smaller than before, the function of the smaller central village was deposited as before. As a new traffic road for the automobile transportation was operated in 1915 the importance of the ancient Youngnam Road was lost and the county offece was removed into Ahnsung, Jugsan was transformed into the center of the transportation and administration of this small area. Regardless of the arragnement of the administrational organizations such as the office of small administration (myun), the police station, and the post office etc., Jugsan’s settliment pattern was changed into a dike village. The primary type of the house structure which has four rooms(L shaped) and remarkably reflects the regional character almost disappeared, and the urban type of the house structure was widely spread. In 1970’s, a reform plan for the New Community Movement transformed Jugsan into a new Strassen Dorf by widening and paving the street and bulding new shops and stores. Jugsan is confirmed as a small central village which supplies merchandise to the surrounding areas. This fact is well reflected in vocational composition of the dwellers of this village. In 1980, 77.4% of non-agricultural families of the whole Eejugmyun are the dwellers of Jugsan-ri, most of whom are centered along the Jugsan Street, and they are playing an important part in performing commercial function. Thus Jugsan-ri keeps the traits of the central village, and has become a typical Strassen Dorf which has grown along the Jugsan street.
Pipe prover의 경년변화가 측정불확도에 미치는 영향
남기한(Ki Han Nam),박용철(Young Chul Park),박종호 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Among various flowmeter calibration methods, a pipe prover method has the merit of using the measured liquid to calibrate a flowmeter in a field, however, a periodical verification of measurement uncertainty is required for pipe prover itself. In this paper, it was analyzed an impact of a yearly drift, one of contributing parameters of measurement uncertainty, to verify the stability of calibration results obtained by pipe prover method. A set of calibration data of 10 pipe provers (for 2 years) was reviewed to evaluate a base volume change of the same pipe prover and to compare base volume change rates with each other. It was found that the base volume change was between 0.003 % and 0.045 % over 2 years. Therefore a pipe prover method is an appropriate means of flowmeter calibration for its measurement stability.
박용철(Young Chul Park),남기한(Ki-Han Nam),박정근(Jung-Guon Park) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
It is very important to have a sufficient straight running length of the upstream and the downstream of flow meter to calibrate a flow meter. We have performed an analytic analysis by a computer simulation to find an stabilized flow velocity in the test section of the flow meter. It was necessary to have a sufficient straight length of the test section pipe to converge on an velocity. And it was found that the stable flow velocity was maintained in 20 times ID to 40 times ID of straight running length in the test section.