• Proceedings of the KIEE Conference
• /
• 2001.10a
• /
• pp.116-118
• /
• 2001

This paper deals with characteristic analysis of a slotless PM linear motor using analytical method. In order to calculate voltage equations, back-EMF waveform and winding inductance are caculated by PM's magnetic field and winding's magnetic field respectively.

• Proceedings of the KIEE Conference
• /
• 2000.07c
• /
• pp.1987-1989
• /
• 2000

In this paper, electric field distribution of dielectric sphere considering surface or volume resistivity is analysed by the use of rotational symmetric charge simulation method. We applied three methods such as ${\alpha},{\beta}$ modified $\beta$ method to check electric field calculation error. We find f method and modified $\beta$ method are suitable to simulate volume and surface resistivity respectively.

• Journal of computational fluids engineering
• /
• v.17 no.1
• /
• pp.16-22
• /
• 2012

Acoustic pressure field around the centrifugal fan is predicted by a aero-acoustic splitting method. Unsteady flow field is obtained by solving the incompressible Navier-Stokes equations using commercial code, while the acoustic waves generated inside the centrifugal fan and shroud are predicted by solving the far field acoustics analysis. Computational results show that the acoustic waves of BPF tone are generated by interactions of the blades with the shroud. Acoustic results is validated by experimental results This paper describes the influence of geometric parameters on the noise generation from the section of blades and shroud. One of the effective ways to reduce BPF noise is optimization method using Genetic Algorithm, which effectively minimize eccentricity, is suggested. New improving design was developed by optimization method.

• Journal of the korean Society of Automotive Engineers
• /
• v.13 no.6
• /
• pp.90-100
• /
• 1991

This paper represents the analysis of the sheet drawing by applying the Matrix method to Hill's slip-line field for small reduction and indirect type slip-line field in case of large reduction. Results of the analysis represent the relation between the reduction ratio and the die wall pressure, mean drawing stress through rough die. The limitation on the use of this slip-line field is described. When the reduction ratio is given, the optimum die angle is analyzed in this paper.

• Transactions of the Korean Society of Mechanical Engineers A
• /
• v.21 no.10
• /
• pp.1598-1608
• /
• 1997

Based on the application of te theory of conjugate approximations and the Loubignac's iterative method in a local region, a method to improve the stress filed in a displacement-formulated finite element solution has been proposed. The validity of the proposed method has been tested through two examples : a thick cylinder under internal pressure loading and an infinite plate with a central circular hole subjected to uniaxial tension. As a result of analysis of the examples, it was found that the stress field obtained for the local region model by the proposed method approximates well for the whole domain model. In addition, it was found that because of a significant decrease in the computing time to obtain the improved stress field, the proposed method is efficient and useful for the detailed stress analysis in local regions.

• Proceeding of KASS Symposium
• /
• 2006.05a
• /
• pp.165-169
• /
• 2006

This study presents a new stress analysis method to be substituted for the elastic analysis in such a plastic design procedure. This method is accompanied by an efficient mathematical tool which can be easily handled by personal computer. The method also easily accepts arbitrary strategies by the designer for selection member size.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.24 no.6
• /
• pp.35-42
• /
• 2010

We use conformal mapping method to derive the analytical expressions for calculating electrostatic fields and electric potentials surrounding the conductor-backed coupled coplanar waveguide(CBCCPW) structure. Using the derived expressions, the electrostatic fields and potentials are computed at various points of the CBCCPW's geometry and the field and potential distributions are analyzed. The proposed method provides a faster and simpler calculation of the field distributions than the full-wave analysis method because no iterations are required. This method can be widely applied to the analysis of microwave integrated circuits using coupled line, such as coupler, filter, and microstrip antenna.

• Journal of Sasang Constitutional Medicine
• /
• v.22 no.3
• /
• pp.67-74
• /
• 2010

1. Objectives: The research papers published by researchers in other fields except Oriental medicine were analyzed to study the research trends and characteristic of Sasang Constitutional medicine. 2. Methods: Systematic searches were performed on KISS, RISS, KISTI and DBPIA and finally 123 papers were selected. The publication year, research field of the first author, title's characteristic, research topic and the classification method of Sasang Constitution were investigated. 3. Results and conclusions: 1) In the analysis of publication year, the number of studies on Sasang Constitution has increased dramatically since 2000. 2) In the analysis of the first author's research field, physical training, nursing, engineering and food and nutrition were the majority. 3) In the analysis of the research topic, the classification method of Sasang Constitution was the majority. 4) In the analysis of the classification method of Sasang Constitution, QSCC II was the most popular method accounted for 68% and interview by specialist of Sasang Constitutional medicine accounted for 42%.

• Proceedings of the KIEE Conference
• /
• 2003.04a
• /
• pp.122-124
• /
• 2003

This paper deals with the magnetic field analysis and compution of cogging torque using an analytical method in high speed brushless motor/generator. The magnetic field is analyzed by solving space harmonics field analysis due to magnetizing distribution and the cogging torque is analyzed by combining field analysis with relative permeance.

• The Transactions of The Korean Institute of Electrical Engineers
• /
• v.64 no.1
• /
• pp.64-71
• /
• 2015

This paper deals with analysis of armature reaction magnetic field of linear generator with three phases coreless/cored type concentrated winding. On the basis of a magnetic vector potential and Maxwell's equations, governing equations to predict armature reaction field are derived, and current density modeling is also performed analytically by using the Fourier series expansion. The analytical method used in this paper is confirmed by comparing with finite element analysis results.