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Water Cut Meter의 표준 검교정 시스템 구성 및 그에 따른 기초 연구
김진목(Jin-Mok Kim),임공섭(Kong-Seop Lim),서재훈(Jae-Hoon Seo),이동준(Dong-Jun Lee) 융복합지식학회 2022 융복합지식학회논문지 Vol.10 No.2
수분함량 측정기(이하, Water Cut Meter)는 석유 생산 현장에서 관로를 통해 흐르는 원유 성분 중 물 유량의 비율을 측정하는 장비이다. 비전통 에너지가 부상하면서 오일 샌드 생산이 증가하게 되었고 이로 인해 생산 유체 중 수분 비율의 더 높은 정확도가 요구되었다. 업계에서는 현장 배치에 앞서 유량계 및 Water Cut Meter의 성능 정확도를 설정하기 위해 다상 유량 루프(Multiphase Flow Loop)를 활용한다. 그러한 시설을 보유한 국가로는 미국, 영국 등이 있지만 현재 국내에 Water Cut Meter 국가교정기관은 없는 실정이다. 본 연구에서는 Water Cut Meter 검교정 시스템을 구성하여 Water Cut 측정 실험과 전산유체해석(CFD)을 수행하였다. 실험 및 CFD 결과, Case 1(Water:Oil=1:1)의 경우에는 시험탱크에 투입한 물과 오일의 비율과 비교해 오일의 농도가 물보다 더 높게 나타난 반면 Case 3(Water:Oil=3:1)은 오일의 농도가 오히려 더 낮게 나타나 물과 오일의 부피 분율이 초기 투입 비율과 달라졌다. 본 연구를 통해 물과 오일의 성분 비율에 따라 관로 내 유동 성질이 다르다는 것을 전제로 Water Cut Meter 검교정 시스템을 구성해야 함을 확인하였다. Water Cut Meter is an equipment that measures the ratio of water flow among crude oil components flowing through pipelines at an oil production site. The rise of unconventional energies has led to an increase in oil sand production, which requires a higher degree of accuracy in the proportion of water in the production fluid. Industry utilizes Multiphase Flow Loops to establish the performance accuracy of flow meters and Water Cut Meters prior to field deployment. Countries with such facilities include the United States and the United Kingdom, but there is currently no national water cut meter calibration institute in South Korea. In this study, water cut measurement experiment and computational fluid analysis (CFD) were performed by configuring a water cut meter calibration system. As a result of experiments and CFD, in Case 1 (Water:Oil=1:1), the concentration of oil was higher than that of water compared to the ratio of water and oil injected into the test tank, whereas Case 3 (Water:Oil=3:1) showed a lower oil concentration, so the volume fraction of water and oil was different from the initial input ratio. Through this study, it was confirmed that the Water Cut Meter calibration system should be configured on the premise that the flow properties in the pipeline are different depending on the ratio of water and oil components.
김영하(Young-Ha Kim),김규식(Kyu-Sik Kim),김진목(Jin mok Kim),강연준(Yeon June Kang),김찬묵(Chan mook Kim),이재운(Jae woon Lee),김의제(Ui je Kim),홍성규(Sung kyu Hong) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
This paper explores the feasibility of estimating the sound pressure level (SPL) in a vehicle compartment when the attachment stiffness (i.e., the local stiffness of the connecting point at which operational force is applied) is changed. The FRF-based synthesis (FBS) technique and FRF-based substructure identification method are used to estimate the change in attachment stiffness and simulate noise transfer function (NTF). The proposed methods are verified by comparing the estimated NTF with the measured results when the stiffness of the attachment is increased by connecting an additional beam to that attachment is required to estimate the SPL in the vehicle compartment, a transfer path analysis (TPA) is also performed to calculate the force data. The sound pressure levels in various operating conditions are estimated ultimately by using force data from the TPA procedure and the NTF estimated from the FBS technique.
Detection of Rapid Atrial Arrhythmias in SQUID Magnetocardiography
김기웅,권혁찬,김기담,이용호,김진목,김인선,임현균,박용기,김두상,임승평,Kim Kiwoong,Kwon Hyukchan,Kim Ki-Dam,Lee Yong-Ho,Kim Jin-Mok,Kim In-Seon,Lim Hyun-Kyoon,Park Yong-Ki,Kim Doo-Sang,Lim Seung-Pyung The Korean Superconductivity Society 2005 Progress in superconductivity Vol.7 No.1
We propose a method to measure atrial arrhythmias (AA) such as atrial fibrillation (Afb) and atrial flutter (Afl) with a SQUID magnetocardiograph (MCG) system. To detect AA is one of challenging topics in MCG. As the AA generally have irregular rhythm and atrio-ventricular conduction, the MCG signal cannot be improved by QRS averaging; therefore a SQUID MCG system having a high SNR is required to measure informative atrial excitation with a single scan. In the case of Afb, diminished f waves are much smaller than normal P waves because the sources are usually located on the posterior wall of the heart. In this study, we utilize an MCG system measuring tangential field components, which is known to be more sensitive to a deeper current source. The average noise spectral density of the whole system in a magnetic shielded room was $10\;fT/{\surd}Hz(a)\;1\;Hz\;and\;5\;fT/{\surd}Hz\;(a)\;100\;Hz$. We measured the MCG signals of patients with chronic Afb and Afl. Before the AA measurement, the comparison between the measurements in supine and prone positions for P waves has been conducted and the experiment gave a result that the supine position is more suitable to measure the atrial excitation. Therefore, the AA was measured in subject's supine position. Clinical potential of AA measurement in MCG is to find an aspect of a reentry circuit and to localize the abnormal stimulation noninvasively. To give useful information about the abnormal excitation, we have developed a method, separative synthetic aperture magnetometry (sSAM). The basic idea of sSAM is to visualize current source distribution corresponding to the atrial excitation, which are separated from the ventricular excitation and the Gaussian sensor noises. By using sSAM, we localized the source of an Afl successfully.
한국형 뇌자도 시스템을 이용한 유발 자계 측정 및 임상 응용
김봉수(Bong Soo Kim),장원석(Won Seok Chang),황수정(Su-Jeong Hwang),김기웅(Kiwoong Kim),권혁찬(Hyukchan Kwon),유권규(Kwon-Kyu Yu),김진목(Jin-Mok Kim),이용호(Yong-Ho Lee),장진우(Jin Woo Chang) 대한전자공학회 2014 전자공학회논문지 Vol.51 No.10
시공간 분해능이 우수하고 비침습적으로 대뇌 신경활동의 측정이 가능한 뇌자도는 뇌기능 연구 및 뇌질환 진단에 유용한 진단용 의료기기이다. 순수 국내기술로 개발한 한국형 뇌자도 시스템을 임상시설(병원)에 설치하고 뇌질환 환자를 대상으로 유발자계를 측정, 분석하여 한국형 뇌자도 시스템의 임상 응용 가능성을 검토하였다. 1) 반측성 안면 경련 환자를 대상으로 소리자극에 대한 청각유발자계를 측정, 분석하여 안면신경과 청신경의 상호작용 여부 및 이명과의 연관성 검토, 2)뇌종양 환자의 정중신경 자극에 대한 체성감각 유발자계를 측정하여 뇌전증 유무에 따른 연관성 검토. 뇌자도 데이터의 분석 결과로부터 한국형 뇌자도 시스템이 뇌기능 연구 및 뇌질환 진단에 유용한 시공간적인 분석 정보를 제공할 수 있음을 시사하고 있다. Korean magnetoencephalography (MEG) system had been developed and installed to hospital. The Korean MEG system contains helmet-shaped arrays of 152 first-order double relaxation oscillation SQUID (DROS) sensor. As a clinical application we have measured and analyzed evoked responses in patients with functional brain disease by outer stimulation as follows; 1) auditory evoked field in patients with hemifacial spasm, 2) somatosensory evoked fields in patients with tumor. We confirm that neuromagnetic data by Korean MEG system can provide useful information for pre-surgical planning or functional brain research.
관상동맥질환을 진단하기 위한 R파와 T파의 크기에 대한 연구
임현균,유권규,김진목,김인선,강찬석,박용기,Lim, Hyun-Kyoon,Yu, Kwon-Kyu,Kim, Jin-Mok,Kim, In-Seon,Kang, Chan-Seok,Park, Yong-Ki 한국초전도학회 2008 Progress in superconductivity Vol.10 No.1
Multi-channel magnetocardiography (MCG) has been proposed to detect ischemic heart disease because its sensitivity is quite high comparing with other conventional diagnostic tools. Especially, current map and magnetic field map of MCG provide crucial information on whether myocardiac muscles maintain the normal conduction pathway. In addition, MCG parameters derived from repolarization are useful to detect coronary artery disease. Recently, there was a study reporting that R- and T- wave amplitude are highly correlated with ischemic heart disease. In this study, we studied R- and T-wave amplitude and their ratio as well as MCG parameters. MCG data from 20 young, 20 age-matched controls, and 20 myocardial infarction (MI) patients were analyzed. As a result, MCG parameters showed significant change in MI patients comparing to those of controls. R- and T-wave amplitude of MI patients showed a feature of severe ischemic heart disease even though it was difficult to find consistent values. Further study is needed to reveal the relations between small T-wave amplitude and coronary artery disease.
심자도 측정용 고온초전도 SQUID magnetometer 의 제작
김인선,이상길,김진목,권혁찬,이용호,박용기,박종철 ( In Seon Kim,Sang Kil Lee,Jin Mok Kim,Hyuk Chan Kwon,Yong Ho Lee,You Ki Park,Jong Chul Park ) 한국센서학회 1997 센서학회지 Vol.6 No.4
YBa₂Cu₃O_7 single layer do SQUID magnetometers, prepared on 1 ㎠ SrTiO₃ substrates, have been fabricated and characterized. Based on the analytical description, a SQUID magnetometer design having a 8.5 mm pickup coil with 2.6 mm linewidth, and a SQUm inductance Ls = 50 pH with 3 ㎛ Josephson junctions is presented. The devices showed a maximum modulation voltage depth of 65 ㎶ and a magnetic field noise of 0.6 pT/√Hz at 1 Hz. Clear traces of human magnetocardiogram could be obtained with the SQUID magnetometer operating at 77 K.