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비디오테이프 KR이 테니스 첫 서비스 수행과 자기효능감에 미치는 영향
박기용,박영명,박병규,백인준 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.2
The purpose of this study was to examine the effect of Video Tape KR on First Serve Performance and self-efficacy. The 16 subjects were intentionally assigned to 2 different conditions groups : 8 involved in Video Tape KR A group(experimental group 1), and 8 involved in control group. Each experimental group participated in Video Tape KR A group and B group for 5 weeks. The experimental task was First Serve Performance. The experimental instruments were Video Tape KR A, and self-efficacy questionnaires. The Video Tape KR suitable for tennis was comprised of general instructions, t-test was conducted to test the data. The conclusions are as followings: 1. The Video Tape KR has an affirmative influence upon First Serve performance. 2. The Video Tape KR has an influence upon self-efficacy. 3. The Video Tape KR has an influence upon First Serve performance and self-efficacy.
임상교정 교육용 멀티미디어 데이터베이스 웹서버 구축에 관한 연구
박재우,이종기,장영일,남동석,김명기,양원식,김태우,백승학 대한치과교정학회 2000 대한치과교정학회지 Vol.30 No.2
본 연구는 인터넷상의 가상공간에 다양한 자료로 구성된 환자 증례를 통해, 교정을 배우고자 하는 임상의나 학생들의 교육에 필요한 멀티미디어 데이터베이스를 구축하기 위한 것이다. 이러한 시스템을 구현하기 위해서는 이미지 자료의 처리, computer network를 통한 빠른 정보처리 기능, 진단 분석법의 개발, 데이터베이스의 구축 기술, 데이터베이스와 인터넷과의 연계, 증례를 통한 교육방법론과 같은 기술적 문제점들이 있다. 진단과 치료계획을 위한 분석은 모델 분석과 두부방사선 사진분석으로 나누어 제공하였다. 모델분석법은 arch length discrepancy와 Bolton tooth ratio를 환자 정보란에 제공하였다. 두부방사선 사진분석은 초진란에 제공하였다. Cephalometric analysis ver 2.0과 Power Ceph pro 3.3.5를 이용하여 Tweed, Steiner, Jarabak분석법 등을 제공하였으나, 본문에서는 주로 Kim's analysis와 몇 가지 계측치를 추가하여 설명하였고, 나머지는 tracing란에서 제시하였다. 또한 치료 종료 후나 보정란에서 치료 전, 후의 두부방사선 사진을 중첩해서 보여줌으로써 치료에 의한 효과를 직접 볼 수 있도록 하였다. The Objective of this research was to construct the multimedia database system that was necessary for the education of the practitioners and the students. To establish this system, there were technical problems as follows : 1) The processing of the images, 2) The rapid processing of the information with the computer network, 3) The development of diagnosis tools, 4) The technique to establish the database system, 5) The link between the database system and the internet, and 6) The method to educate through many cases. The analysis for diagnosis and treatment planning were provided as two parts : model analysis and cephalometric analysis. As a model analysis, arch length discrepancy and Bolton tooth ratio were provided for the part of patient information. Cephalometric analyses were provided in the part of initial diagnosis. The Cephalometric analysis ver 2.0 and the PowerCeph pro 3.3.5 were used to show Tweed, Steiner and Jarabak analysis. In the main part, Kim's analysis and some measurements were added. In the post-treatment or retention part, we show the superimposition of the cephalometrics with which you can find the effectiveness of the various orthodontic treatment. The address of this home page is "http://damis.snu.ac.kr/orthodontics"
Numerical Analysis and Experiment for Microparticle Collector Using Dielectrophoretic Force
Myung Ki Baek,Gwang Jun Yu,Il Han Park IEEE 2014 IEEE transactions on magnetics Vol.50 No.2
<P>The motion of dielectric microparticles in the proposed particle collector is modeled and analyzed with coupled equations of electromagnetics, fluidics, and particle dynamics. The dielectrophoretic and drag forces on microparticles are obtained using distributions of electric field and fluid velocity field. The two fields are numerically calculated by the FEM. All the forces on the particles are employed for Newton's dynamic equation for particle motion analysis. To evaluate the proposed new method, an experimental system for the particle collector is designed and built to measure the trapping performance, which is estimated using standard microparticles and a particle counter under a given air flow.</P>
Numerical Analysis for Magnetophoretic Separation of Blood Cells in Fluid and Magnetic Field
Myung Ki Baek,Hong Soon Choi,Ki Sik Lee,Il Han Park IEEE 2012 IEEE transactions on applied superconductivity Vol.22 No.3
<P>In this paper, the characteristics of blood cell motion are analysed by solving a coupled electromagnetic, fluid and particle dynamics problem. The forces acting on blood cells are obtained from magnetic field and fluid field distributions, both of which are numerically calculated by the finite element method. These force consist of the magnetophoretic force, drag force, buoyancy and gravity, these are driving terms in Newton's equation for the particle motion. We propose a numerical analysis procedure to solve the coupled problem, and a micro cell separation device without a micro fabricated structure is designed. The dynamic characteristics of the cell motion are simulated. The simulation results show the proposed numerical scheme to analyse the micro particle dynamics and also show the usefulness of the designed device.</P>
Magnetic Separation for Contaminants in Wastewater Using Magnetic Micro Bead
Myung Ki Baek,Tan Il Sung,Eun Su Cho,Kyu Cheol Namkung,Dong Jin Bae,Il Han Park IEEE 2012 IEEE transactions on magnetics Vol.48 No.11
<P>In this paper, a new physical method for wastewater treatment that uses magnetic micro beads and a magnetic field is proposed. An experimental jar test for the separation of micro particle is carried out to show its feasibility. In the stirring process, contaminants of wastewater can adhere to magnetic beads, and then magnetic floc can be formed around the beads. This magnetic floc can be separated from the wastewater by an external magnetic field. A separation system is also designed, and its performance is numerically analyzed using the electromagnetic finite element method coupled with the fluid equation and the dynamic equation of particles wherein the driving force includes the magnetophoretic force, gravity, buoyancy, and drag force.</P>
Experiment and Analysis for Effect of Floating Conductor on Electric Discharge Characteristic
Myung Ki Baek,Young Ki Chung,Il Han Park IEEE 2013 IEEE transactions on magnetics Vol.49 No.5
<P>In this paper, we present a numerical analysis method for analyzing the discharge characteristic with the presence of a floating conductor. Space charges generated during the discharge process can accumulate on the surface of the floating conductor, or be emitted from its surface. An intensification of the electric field around the floating conductor is affected by those space species. Therefore, it is important to calculate the space-charge distributions considering the surface charge on a floating conductor because the discharge occurs at the floating conductor, which is placed around the cathode. An axial symmetry finite-element model is used to analyze this floating conductor discharge system, and Poisson's equation is coupled with the hydrodynamic drift-diffusion equation to calculate space charge distributions. Fowler-Nordheim electron emission is employed for the boundary condition at conductor surfaces. The analysis results show the variation of the electric field due to the space charges and the surface charge density on the floating conductor. Experiments using corona generators are carried out, and the current data obtained show the space charge generated by the presence of a floating conductor.</P>
Myung Ki Baek,Kang Hyouk Lee,Il Han Park IEEE 2015 IEEE transactions on magnetics Vol.51 No.3
<P>A multi-scale problem with respect to time scale occurs in dielectric barrier discharge with moving electrode. The discharge system is modeled with the coupled equation, which consists of a discharge equation for space charge density variation and Poisson's equation for electric field distribution. The analysis model consists of two parallel cylinder electrodes covered with dielectric material. Space charges generated during discharge are accumulated on dielectric barrier, and it affects electric field distribution and the following discharges. In the proposed method, the multi-scale analysis is divided into several steps considering the movement of the surface charge accumulated on the dielectric barrier. The surface potential of electrode is measured and compared with the calculated one. The analysis results show good agreement with the measured surface potential.</P>