• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.77-79
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• 2008

This paper deals with extraction of design parameters of Linear Switched Reluctance Motor (LSRM) based on force calculation using space harmonic analysis, 2D Finite Element Method (FEM) and experimental measurement. First, analytical solutions for flux density due to mover winding currents are derived in terms of magnetic vector potential and a 2D rectangular coordinate system, for the case when the mover is located at aligned and unaligned position. The analytical results are compared with those obtained from a 2D FEM Second, using Fourier series expansion, this paper predicts the force profile of LSRM analytically.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 하계학술대회 논문집 B
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• pp.900-902
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• 2002

This paper deals with reduction of torque ripple of slotless PM linear synchronous motor (PMLSM) with divided permanent magnet using 2D analytical method. To confirm the validity of this study, analysis values by analytical method are comprared with the results of 2D FEM and experimental results. And the results of divided PM model is compared with none divided PM model.

• 분석과학
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• 제10권4호
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• pp.240-245
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• 1997

ICP/MS에 의해 전혈 중의 납을 정확하게 분석하는 방법을 개발하였다. 전혈시료를 납의 오염과 손실 없이 마이크로파 분해장치에서 분해시키고, 96개 혈액시료 중의 $Pb^{208}$을 ICP/MS로 측정하여 분석하였다. 실제 인체 혈액 시료 중의 Pb 함량은 $2.50{\sim}22.8{\mu}g/dL$ 범위였다. NIST SRM 955a series를 분석함으로써 이 분석방법의 정확도를 확인하였다.

• 한국초전도저온공학회:학술대회논문집
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• 한국초전도저온공학회 2000년도 KIASC Conference 2000 / 2000년도 학술대회 논문집
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• pp.60-62
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• 2000

It is widely acknowledged that the value of critical current in High Temperature Superconducting (HTS) tape has a great influence on B. Therefore, when HTS cable is designed, a method to reduce the B should be considered in order to improve the capacity. This paper deals with the influence of the space between each HTS tape by using 2D analytical method. From the analysis results, it is found that the decrease of the space causes the decrease of B. Moreover, another HTS cable, which has a very small space, is analyzed by 3D analytical method and it is manufactured. The validity of these analysis results are verified by comparison with experimental results.

• 분석과학
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• 제20권3호
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• pp.255-260
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• 2007

A new method for the simultaneous determination of low molecular weight amines and quaternary ammonium ions based on the separation by IC with a suppressor and the detection by MS with ESI has been developed. The method has been applied to the analysis of a mixture containing tetramethylammonium ion, tetraethylammonium ion, tetrapropylammonium ion, triethanolamine, trimethylamine and triethylamine. The constituents were separated by isocratic elution using an IonPac CS17 column, a cation-exchange column, and detected by conductivity and mass spectrometry. The newly developed method for the six components demonstrated that the repeatability in terms of relative standard deviation for three measurements was in the range of 0.1-0.5 %. The detection limits were between 0.2 and $0.9{\mu}g/mL$ by the IC/ESI-MS.

• Mass Spectrometry Letters
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• 제10권1호
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• pp.38-42
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• 2019

Damaurone D belongs to the genus Rosa and is a traditional medicinal product used for the treatment of depression, inflammation, and infectious diseases. The purpose of this study was to develop a simple liquid chromatography-tandem mass spectrometry method for the detection of damaurone D in rat plasma and to demonstrate its application in pharmacokinetic studies. Damaurone D and berberine (internal standard) were extracted with acetonitrile using a protein precipitation method. Mass transition was monitored in multiple reaction monitoring mode at m/z $323.2{\rightarrow}267.0$ for damaurone D and m/z $336.1{\rightarrow}320.0$ for berberine in positive ion mode. Analytical validation was conducted by evaluating the specificity, linearity, accuracy, precision, matrix effect, extraction recovery, and stability. The calibration curves were linear over 2-1000 ng/mL. The intra- and inter-day precision and accuracy of quality control samples were 4.79-13.33% and 86.23-102.75%, respectively. The matrix effect and extraction recovery were 96.11-98.47% and 96.11-102.25%, respectively. In the pharmacokinetic study after intravenous administration of damaurone D at a dose of 3 mg/kg in rats, the area under the curve and clearance of damaurone D in rat plasma were $16750.26{\pm}2676.10min{\cdot}ng/mL$ and $182.44{\pm}31.36mL/min/kg$, respectively.

• Journal of Magnetics
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• 제18권2호
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• pp.135-141
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• 2013

This paper proposes an efficient fault detection method for onboard degaussing coils which are installed to minimize underwater magnetic fields due to the ferromagnetic hull. To achieve this, the method basically uses field signals measured at specific magnetic treatment facilities instead of time-consuming numerical field solutions in a three-dimensional analysis space. In addition, an analytical design sensitivity formula and the linear property of degaussing coil fields is being exploited for detecting fault coil positions and assessing individual degaussing coil currents. Such peculiar features make it possible to yield fast and accurate results on the fault detection of degaussing coils. For foreseeable fault conditions, the proposed method is tested with a model ship equipped with 20 degaussing coils.

• Structural Engineering and Mechanics
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• 제20권2호
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• pp.209-223
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• 2005

A new method for deriving analytical solution of the annular elastic plate on elastic foundation under axisymmetric loading is presented. The formulation is based on application of Hankel integral transforms and Bessel functions' properties in the corresponding boundary-value problem. A representative example is studied and the obtained solution is compared with published numerical results indicating excellent agreement.

• 대한토목학회논문집
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• 제26권5B호
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• pp.557-562
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• 2006

준설작업으로 인해 재부유된 퇴적물로 구성된 탁도플륨의 이송확산 거동을 예측하기 위해 이(1998)가 제안한 수치 해석의 혼합방법(hybrid method)을 사용하여 3차원 수치모형을 개발하였다. 본 모형에서는 이송 및 확산식의 수치해석에 있어 이송 과정은 전방입자추적기법(forward particle-tracking method), 확산 과정은 유한차분기법을 사용하여 수치계산에 있어 무작위 행보(random walk) 방법에 비해 계산시간이 크게 단축되었으며, 수치모의 결과의 정확성도 크게 향상되었다. 본 모형을 검증하기 위하여 1, 2차원 해석해와의 비교, 그리고 Kuo 등(1985)의 3차원 수리해석모형의 계산결과와 비교하였다. 본 모형의 검증 결과는 비교적 해석해와 잘 일치하였다.

• 전기학회논문지
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• 제63권5호
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• pp.652-659
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• 2014

This paper deals with characteristic analysis of double sided permanent magnet linear generator using analytical method. We derived magnetic field solutions produced by permanent magnet and armature reaction based on the 2D polar coordinate and magnetic vector potential. based on the derived magnetic field solutions, Induced voltage is obtained when arbitrary sinusoidal input condition. In addition, electrical parameters such as back-EMF constant, resistance, and inductance are obtained. Finally, generating performance characteristic at the rated load and various load is examined by using equivalent circuit.