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유한 요소법과 부분 구조 합성법을 이용한 회전 디스크-스핀들 계의 진동 해석
정명수,장건희,Jeong, Myeong-Su,Jang, Geon-Hui 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.9
Vibration of a rotating disk-spindle system is analyzed by using Hamilton's principle, FEM and substructure synthesis. A rotating disk undergoes the rigid body motion and the elastic deformation. It s equation of motion is derived by Kirchhoff plate theory and von Karman nonlinear strain. A rotating shaft is described by Rayleigh beam theory considering the axial rigid body motion. The stationay shaft supporting the rotating disk-spindle-bearing system is modeled by Euler beam theory, and the stiffness of ball bearing is determined by A.B.Jones' theory. FEM is used to solve the derived governing equations, and substructure synthesis is introduced to assemble each structure of the rotating disk-spindle system. The developed theory is applied to the spindle system of a 35' computer hard disk drive with 3 disks to verify the simulation results. The simulation results agree very well with the experimental ones. The proposed theory may be effectively expanded to the complex structure of a disk-spindle system.
비인기종목 스폰서십에 따른 이벤트-스폰서일치성과 스폰서공신력, 스폰서동기, 스폰서-이벤트 태도의 관계분석
정명수(Myeong Su Jeong),강동완(Dong Wan Kang) 한국사회체육학회 2012 한국사회체육학회지 Vol.0 No.47
This study was to find out consumers` response by analyzing relations among event-sponsor coincidence, sponsor confidence, sponsor motive, sponsor, event attitude through structural equation model. The subjects were spectators who watched 2009 SK International Women`s Handball Grand Prix in Seoul, from 28th through 29th. 193 questionnaires were used through convenience sampling method. The results of this study were as follows: First, event-sponsor coincidence has a positive effect on sponsor confidence, but has no effect on sponsor attitude and sponsor motive. Second, sponsor motive has no effect on sponsor confidence. Third, sponsor confidence has a positive effect on sponsor attitude, but sponsor motive has no effect on sponsor attitude. Fourth, sponsor attitude has a positive effect on event attitude. As a result, consumers positively respond to event, sponsor coincidence, sponsor confidence, sponsor attitude, event attitude that are characterized as selfless variables, but negatively respond to sponsor motive that is characterized as a profitable variable, so it needs to make a detailed strategy to make consumers feel like events have public confidence and to make an advertisement strategy to coincide event and sponsor.
프로구단의 마케팅활동과 기업이미지, 제품선호도와의 관계분석
정명수(Myeong Su Jeong),김민철(Min Cheol Kim),이기룡(Gi Ryong Lee) 한국사회체육학회 2009 한국사회체육학회지 Vol.0 No.37
This study was to find out the relations among sale promotion activity, enterprise advertising activity, enterprise image and product preference, and was to verify specific effect about marketing activity of pro-volleyball team that enterprise is managing. The subjects of this study were 252 spectators who entered Hyundai Capital Stadium to watch games among 2007-2008 V-league. We collected data through questionnaires. The results of this study were as follows: First, sale promotion activity had a positive effect on enterprise image. Second, enterprise advertising activity had a positive effect on enterprise image. Third, enterprise advertising activity had a positive effect on product preference. Fourth, enterprise image had a positive effect on product preference. In the result, active marketing activity of pro-volleyball team had a positive effect on enterprise image and product preference that were touchstones of consumers activity and decision making.
정명수 ( Myeong-su Jeong ),장재민 ( Jae-min Jang ),문창수 ( Chang-su Moon ),류현기 ( Hyun-ki Ryu ),오상흔 ( Sang-heun Oh ) 한국정보처리학회 2017 한국정보처리학회 학술대회논문집 Vol.24 No.1
전원 무결성은 PCB의 구조적 공진이 노이즈와 직접적으로 관련이 되어있고, 구조 해석을 위하여 전자장 해석법을 이용하게 된다. 전원 무결성 과정은 PCB의 공진해석을 통해 공진 발생 위치 및 주요선로의 임피던스 분석을 하고 Decoupling 캐패시터와 레이아웃 수정을 통해 목표한 임피던스 값보다 낮아지도록 수정과 해석을 반복하는 작업이다. 제안된 방법을 통하여 PCB 제작 이전에 전자파 성능을 예측하고 개선하여 설계비용을 절감하고 신뢰성을 향상 시킬 수 있을 것으로 판단된다.
정명수(Jeong Myeong Su),심준영(Sim Jun Yeong) 한국사회체육학회 2003 한국사회체육학회지 Vol.19 No.2
This study conducts an experiment with 26 male students in the fourth grade of elementary school who have no brain respiration training and regular exercise experiences in order to examine the effects of brain respiration training for 12 weeks on cellular immunity reaction through six times a week (30 min. for brain respiration group and 20 min. for relaxation exercise group) through 12 weeks by random assignment of 10 students having brain respiration, 8 students having relaxation exercise and 8 students. The first measurement was in stability period before experiment and the second was in stability period after experiment for 12 weeks. Measured items include T lymphocyte which is cellular immunity variable, helper T cell, suppressor T cell and Th/Ts ratio and as a result of analyzing these measurements, the following conclusions are obtained. 1) It is didn`t show that the number of leukocyte a significant difference between effects according to each group and before and after experiment. 2) It is didn`t show that the number of neutrophils a significant difference between effects according to each group and before and after experiment. 3) It is shown that the number of lymphocytes a significant difference in effects before and after experiment and in interrelation effects according to each group and before and after experiment. 4) It is shown that the number of monocytes a significant difference in effects before and after experiment. These conclusions suggest that brain respiration training can have affirmative influence on immunity function elevation and be also helpful to improve health of human body.