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임기원,최종오,Lim, Ki-Won,Choi, Jong-Oh 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.8
A national standard system was developed in order to calibrate and test the oil flowmeters for the petroleum field. A stop valve and a gyroscopic weighing scale were employed for the primary standard of the flow quantity. It is operated by the standing start and finish mode and the static weighing method. The model equation for uncertainty evaluation was based on the calibration principle of standard system. The sources of the uncertainties were quantified and combined according to the GUM(Guide to the Expression of Uncertainty in Measurement). It was found that the standard system had the relative expanded uncertainty of 0.04 % in the range of 18 - 350 ㎥/h. According to the uncertainty budget, the uncertainties of the fluid density and the volume of pipeline, which were temperature dependent, contributed 92% of final uncertainty in the oil flow standard system.
국가교정검사기관(액체유량)의 측정불확도 평가 및 비교연구
임기원 대한설비공학회 2000 설비공학 논문집 Vol.12 No.11
A proficiency test is one of programs which Korea Research Institute of Standards and Science(KRISS), as national metrology institute, is putting in operation for the mutual recognition arrangement. The Fluid Flow Group of KRISS evaluated the measurement capability for liquid flowmeter calibrator of the national calibration and test organizations. The uncertainty of national standard system was estimated in accordance with Guide to The Expression of Uncertainty in Measurement (ISO), and the turbine flowmeter, which was used for the round-robin test as a reference flowmeter, was characterized. The round-robin tests with the turbine flowmeter package were carried out in 1995 and 1999. The test results of the organizations and those of KRISS agreed within $\pm0.2$%. It is found thus that the organizations have the traceability of the national standard for liquid flow measurement.
곡관의 곡률에 따른 전자기유량계 설치효과의 수치모사에 의한 특성 예측(충류)
임기원,최상류,정명균,Lim, Ki Won,Choi, Sang Kyu,Chung, Myung Kyoon 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.11
An electromagnetic flowmeter, based on a magnetic induction principle; provides an obstructionless flowmeter that essentially averages the velocity distribution over the pipe cross-sectional area. To predict the installation effects, the flowmeter installed near $90^{\circ}$ elbow is simulated by using a commercial code FLUENT(ver. 4.48) for the laminar flow field and a code developed through this study for magnetic field. The installation effects of the flowmeter are estimated by varying a number of the dependent parameters such as the radius of the elbow(Rc=1D, 1.5D, 2D, 3D), the location, Reynolds number and the direction of electrodes plane(${\varphi}$). It was found that all these factors affect the performance of the electromagnetic flowmeter significantly. The longer installation distance from the elbow is not always optimal to minimize the error, and also there exists an optimal location to install the EMF for a minimum error. Especially the flow signal with the electrodes plane direction of ${\varphi}=45^{\circ}$ is shown to yield smallest measurement error regardless of the Reynolds number and the curvature of elbow.
Measurement of resting metabolic rate using metabolic chamber in resting rats
임기원,김지수,전예림,황혜정,서혜정 한국운동영양학회 2011 Physical Activity and Nutrition (Phys Act Nutr) Vol.15 No.1
Energy expenditure in rats has traditionally been determined based on oxygen uptake using a metabolic chamber. However, using this method, it was difficult to observe the resting metabolic rate (RMR) over 24 h since the adequate flow rate from the room into the chamber was unknown. In this study, we examined the adequate air flow rate for measurement of RMR in rats using an open circuit respirometry system. The adequate air flow rate into the chamber was found to be 3-4 L/min, but a flow rate of 2L/min flow enhanced RMR in rats weighing 250-350 g. We also examined whether or not the RMR measurement method at a room air flow rate of 3-4 L/min is reproducible. The 24 h RMRs over a consecutive 3 day period did not change. Therefore, we carefully concluded that an air flow rate of 3-4 L/min into the metabolic chamber was adequate. These RMR methods can be acceptable for exercise and nutrition science research and may be useful for health sciences research studies, including assessment of foods, exercise training effects, ageing, and obesity research.