• Title/Summary/Keyword: 3- Dimension

Search Result 285, Processing Time 0.146 seconds

A Study on the Effect of the Contact Electrode Slits in the Vacuum Interrupter with Axial Magnetic Field Type (종자계형 진공 인터럽터에서 접점전극 슬릿의 영향에 관한 연구)

  • 하덕용;강형부;최승길;최경호
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
    • /
    • v.15 no.9
    • /
    • pp.822-829
    • /
    • 2002
  • This paper deals with the distribution characteristics of the current density and axial magnetic flux density for each slits made on the contact electrode in the vacuum interrupter with axial magnetic field type using 3-dimension finite element analysis. It has been known that the presence of an axial magnetic field parallel to the current flow in the arc plasma can increase the high current breaking capacity of vacuum interrupter by carrying out the arc plasma from constricted mode to diffusion mode. The axial magnetic field is created of itself by current flow in the segments of coil electrode behind the contact electrode. The analyzed results show that if the slits are made in the contact electrode, they can increase the current density and axial magnetic flux density in the contact electrode surface and at the gap distance, which is due to decrease the effect of eddy currents flowing in the contact electrode. The phase shift due to eddy currents, defined 3s time difference between the maximum value of current and axial magnetic field, is decreased still more by increasing the number of slits made in the contact electrode at the center point of gap distance. These results demonstrate that 3-dimension finite element analysis has a great deal of merits in the development and evaluation of new electrode at the design of vacuum interrupter.

The Role of Modeling in Prosthetics Make-up (보철분장에 있어 모델링의 역할)

  • Lee, Hwa-Jin
    • Journal of the Korean Society of Fashion and Beauty
    • /
    • v.2 no.3 s.3
    • /
    • pp.60-67
    • /
    • 2004
  • Representing all the parts of human body visible to fit into the script, it can be told that real make-up has been done. Based on the point of view. it will be different from others. To become the beautiful, beauty make-up has to be done, however, to be someone described in the script or any other factions after analyzing characters of being represented, special make-up fits into that category. In the special make-up, there are two different pins: one is 2 dimension make-up which is describing images using dots, lines and colors and other is 3 dimension which will include necessary shapes to figure. Even though there seems to be different between modern technologies and handy work, since accurate measures and graphics have to be used to make perfect character describes in the script, more investments and studies than before have to be made. Real attraction of 3 dimension make-up is building up the images and shapes using unseen abstract images having analyzing characters. It will be decided in the working process called modeling. As having distinguished this part from other make-ups as named prosthetics make-up, proposing means and measures of prosthetics make-up will actually help the others who are studying make-up.

  • PDF

A Study of the Characteristics on the Vacuum Interrupter with Axial Magnetic Field Type using 3 Dimension Finite Element Analysis (3차원 유한요소해석을 이용한 종자게형 진공 인터럽터의 특성고찰)

  • 하덕용;강형부
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
    • /
    • v.15 no.5
    • /
    • pp.460-467
    • /
    • 2002
  • This paper deals with the distribution characteristics of the current density and axial magnetic flux density on the vacuum interrupter with axial magnetic field type using 3 dimension finite element analysis. An axial magnetic field parallel to the current flow in the arc column can improve the current breaking capacity of vacuum interrupter by affecting the arc mode. The axial magnetic flux density on the contact electrode surface is analyzed by inputting external current as a function of the transient time for sine half wave. And it also is analyzed within the gap distance of the contact electrode. The peak value of current but is decreased with the descending current on the contact electrode surface and within the gap distance of the contact electrode. The residual magnetic field is generated on the contact electrode surface and within the gap distance in the instant of zero current, which is due to the influence of eddy currents. The phase shift due to eddy currents, defined as time difference between the maximum value of current and axial magnetic field, is about 1ms in the center point of gap distance.

A study on developing material for teaching and learning mathematising - the number of unit squares a diagonal passes through for an m by n lattice rectangle and its generalization (수학화 교수.학습을 위한 소재 개발 연구: 격자 직사각형의 한 대각선이 지나는 단위 정사각형의 수와 그 일반화)

  • 박교식
    • Journal of Educational Research in Mathematics
    • /
    • v.13 no.1
    • /
    • pp.57-75
    • /
    • 2003
  • The goal of this paper is to offer material which make mathematising Fruedenthal(1991) proposed be experienced through the process of teaching and learning mathematics. In this paper, the number of unit squares a diagonal passes through for an m$\times$n lattice rectangle is studied and its generalization is discussed. Through this discussion, the adaptability of this material Is analysed. Especially, beyond inductional conjecture, the number of unit squares is studied by more complete way, and generalization in 3-dimension and 4-dimension are tried. In school mathematics, it is enough to generalize in 3-dimension. This material is basically appropriate for teaching and learning mathematising in math classroom. In studying the number of unit squares and unit cubes, some kinds of mathematising are accompanied. Enough time are allowed for students to study unit squares and unit cubes to make them experience mathematising really. To do so, it is desirable to give students that problem as a task, and make them challenge that problem for enough long time by their own ways. This material can be connected to advanced mathematics naturally in that it is possible to generalize this problem in n-dimension. So, it is appropriate for making in-service mathematics teachers realize them as a real material connecting school mathematics and advanced mathematics.

  • PDF

Design of 3 Dimension Characteristics of Hoseo University with their Animations (호서대 3D 캐릭터 애니메이션 제작)

  • 김경식;최승관;박승호;강현구;김대현;나성남
    • Proceedings of the Korea Multimedia Society Conference
    • /
    • 2000.04a
    • /
    • pp.433-436
    • /
    • 2000
  • 학교의 상징인 독수리를 근거로 하여 13학부를 나타내는 13마리의 독수리 가족 (가족명 : 즈믄수리) 의3차원 캐릭터와 애니메이션을 제작했다. 각 학부의 구성원들에게 특징이 되는 사물과 색깔 등을 설문조사하여 자료를 수집하고 학교의 대표 성격인 벤처정신으로 나타내도록 독수리 가족을 디자인하고 Soft Image 로 모델링하여 애니메이션 작업을 수행했다. 즈믄수리 ; 천(1000)을 뜻하는 '즈믄'과 독수리를 뜻하는 '수리'의 합성어로 '새천년에 태어난 독수리'라는 뜻을 가지고 있다. 새로운 천년에 태어나 호서대학교의 희망과 비전을 상징하는 이름이다. 13개 학부 캐릭터 모두를 통칭하는 가족의 이름으로 불린다.

  • PDF

The Study for Improvement of False Contour in the Plasma Display Panel (플라즈마 디스플레이 패널의 의사윤곽 개선에 관한 연구)

  • Shin, Jae-Hwa;Ha, Sung-Chul;Lee, Seok-Hyun
    • The Transactions of the Korean Institute of Electrical Engineers P
    • /
    • v.52 no.3
    • /
    • pp.113-120
    • /
    • 2003
  • Plasma display panels normally utilize the binary coded light emission scheme for gray scale expression. Subsequently, this expression method makes dynamic false contours. We propose the "E3DSM(enhanced 3-dimension scattering method)" that improved existing 3-d scattering method and the "HAM(histogram analysis method)" that is decided the driving schemes and subfield selections with histograms of images. Simulation results show the improving image quality.

Analysis of acoustic pressure by 3-dimension Boundary Element Method (3차원 경계요소법을 이용한 방사 음압 분포 해석)

  • Kim, Hong-Suk;Joo, Hyun-Woo;Jung, Hyun-Kyo
    • Proceedings of the KIEE Conference
    • /
    • 2005.07b
    • /
    • pp.1014-1016
    • /
    • 2005
  • 본 논문에서는 3차원 경계요소법을 이용한 헬름홀츠 방정식의 해석을 통해 수중에 있는 디스크형 압전 진동자의 방사 음압 해석을 수행하였다. 이 같은 디스크형 모델의 수치해석적 결과를 기존의 이론적 결과와 비교하여 본 논문의 경계요소법 해석의 타당성을 검증하였다.

  • PDF

Exterior Acoustic Holography Reconstruction of a Tuning Fork using Inverse Non-singular BEM (역 비고유치 BEM을 사용한 소리 굽쇠의 외부 음향 홀로그래픽 재현)

  • Jarng, Soon-Suck;Lee, Je-Hyeong
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2002.11a
    • /
    • pp.335.2-335
    • /
    • 2002
  • Non-singular boundary element method (BEM) codes are developed in acoustics application. The BEM code is then used to calculate unknown boundary surface normal displacements and surface pressures from known exterior near field pressures. And then the calculated surface normal displacements and surface pressures are again applied to the BEM in forward in order to calculate reconstructed field pressures. (omitted)

  • PDF

Tuning Fork Analysis using FEM and BEM (FEM과 BEM을 사용한 소리굽쇠 분석)

  • Jarng, Soon-Suck;Lee, Je-Hyeong;Park, Yeun-Young
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2002.11a
    • /
    • pp.401.2-401
    • /
    • 2002
  • An unconstrained tuning fork with a 3-D model has been numerically analyzed by Finite Element Method (FEM) and Boundary Element Method (BEM). The first three natural frequencies were calculated by the FEM modal analysis. Then the change of the modal frequencies was examined with the variation of the tuning fork length and width. (omitted)

  • PDF

Numerical Analysis for Dynamic Response of Railway Plate Girder Bridges according to Types of Train (판형교의 열차유형별 동적응답에 대한 수치해석)

  • 오지택;박문석;최진유
    • Proceedings of the KSR Conference
    • /
    • 2001.10a
    • /
    • pp.310-315
    • /
    • 2001
  • In this study, railway plate girder bridges are modeled in detail for finite elements within 3-dimension and analyzed by SAP 2000N, a commercial finite element analysis tool. Especially, loads of trains gained by statistical averages of measured true loads of trains are used for analysis. When the loads are adapted, the numerical dynamic responses are very close to real measurements. Resonant speed areas by train types are evaluated from the results of numerical analyses by different driving speeds of trains. For dynamic numerical analysis of railway bridges, reasonable guides are also discussed.

  • PDF