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PIV를 이용한 HVAC용 Blower 주의 유동특성에 대한 실험적 연구
지호성(Ho Seong Ji),김보람(Bo Ram Kim),김석(Seok Kim),이상준(Sang Joon Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Flow characteristics around a blower unit have been investigated using a high-resolution PIV technique. The PIV system consists of a 2-head Nd:YAG laser, a high-resolution CCD camera, optics and a synchronizer. The prototype centrifugal fan with forward-curved blades of an automotive HVAC module was used directly. Only the scroll casing was made transparently for capturing flow images. The time-averaged velocity distributions show that velocities are accelerated with going toward the outer wall of scroll due to large pressure gradient between the fan and outer casing wall. The presence of cut-off angle region and diffusing duct of fan outlet influence the flow structure largely.
다중평면 PIV측정에 의한 저층건물 주위의 유동특성 규명
지호성(Ho Seong Ji),추재민(Jae Min Choo),김경천(Kyung Chun Kim) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.9
Flow structures around a rectangular prism have been investigated by using a PIV(Particle Image Velocimetry) technique. A thick turbulent boundary layer was generated by using spires and roughness elements. The boundary layer thickness, displacement thickness and momentum thickness were 650㎜, 117.4㎜ and 78㎜, respectively. The ratio between the model height(40㎝) and the boundary layer thickness H/δ, was 0.06. The Reynolds number based on the free stream velocity and the momentum thickness was 1.34×10⁴. The PIV measurements were performed at three different wall normal planes. Three recirculation regions at forward facing step, top of the roof and backward facing step are clearly seen and show three dimensional features. Dramatic changes of flow patterns in the wake regions in different spanwise wall normal planes are depicted. Instead of reattachment and recirculation, rising streamlines are observed at the normal planes near the side wall due to the interaction with a rising horse shoe vortex. The peak of turbulent kinetic energy occurs at the separation bubble on top of the roof and the magnitude is 2.5 times higher compared with that of the wake region.
쾌적성 향상을 위한 차량용 공조장치 내부 유동에 대한 가시화 연구
지호성(Ho Seong Ji),정요한(Yo Han Jeong),백제현(Jae Hyun Baek),이상준(Sang Joon Lee) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Air flow inside an automotive HVAC module was visualized using a high-resolution PIV technique with varying the temperature operation mode. The PIY system consists of a 2-head Nd:YAG laser(125mJ), a high-resolution CCD camera(2K×2K), optics and a synchronizer. A real automotive HVAC module was used directly as a test model. Some casing parts of the HVAC module casing were replaced with transparent windows for capturing flow images with laser light sheet beam illumination. Time-averaged velocity fields were measured for different temperature control modes. Flow characteristics of the air flow inside the automotive HVAC system were evaluated from the PIY data and numerical data..
온도조절 격판 변화에 따른 차량용 HVAC 내부 유동의 PIV속도장 측정 연구
지호성(Ho Seong Ji),이상준(Sang Joon Lee) 한국가시화정보학회 2008 한국가시화정보학회지 Vol.6 No.1
Air flow inside an automotive HVAC module has been investigated using a high-resolution PIV technique with varying the temperature operation mode. The PIV system consists of a 2-head Nd:YAG laser (125 mJ), a high-resolution CCD camera (2K×2K), optics and a synchronizer. A real automotive HVAC module was used directly under real operating condition. Some casing parts of the HVAC module were replaced with transparent windows for capturing clear flow images with laser light sheet beam illumination. Time-averaged velocity fields were obtained for two different temperature control modes. Flow characteristics of the air-conditioned air flow inside the automotive HVAC system for the two temperature baffle conditions were evaluated.
대학 태권도 품새 팀의 LMX가 선수생활만족 및 운동지속의사에 미치는 영향
지호철(Ji, Ho-Chul),정명규(Jung, Myung-Kyu) 한국무예학회 2021 무예연구 Vol.15 No.2
본 연구는 대학 태권도 품새 팀 및 선수들의 특성에 맞는 유용한 운동지속의사 향상방안에 대한 시사점 제공을 목적으로 품새 팀 주장과 팀원 간의 LMX와 선수생활만족, 운동 지속의사 간의 인과관계에 대한 연구이다. 연구목적의 달성을 위해 편의표본추출법을 이용하여 현재 대학에서 활동 중인 품새 선수들을 대상으로 300부의 자료를 수집하였다. 이후 불성실하다고 판단되는 41부를 제외한 259부를 대상으로 PASW/PC 25.0 ver.을 사용하여 빈도분석, 탐색적 요인분석, 신뢰도 분석, 상관분석, 다중회귀분석을 실시하였다. 도출된 결과를 토대로 분문에서는 LMX, 선수생활만족이 대학 품새 선수들의 운동지속의사에 주효한 역할을 수행하고 있으며, 이때 LMX는 운동지속의사에 대한 직접효과 및 선수생활만족을 통한 간접효과를 근거로 대학 선수들의 이탈방지에 관한 가장 실질적인 방안으로 작용할 수 있음을 확인하였고. 보다 실천적인 측면에서 대학 품새 팀 주장과 팀원들 간 교환 관계의 질을 높이기 위한 증진방안이 모색되어야 함을 제안하였다. The purpose of this research is to study the casual relationship that exists between the LMX(Leader-Member Exchange) of the leader of Poomsae team and team members with the athlete’s life satisfaction and intention to continue exercising and thus to provide implications regarding suitable improvement plans on one’s intention to continue exercising that pertain to the characteristics of a university Taekwondo Poomsae team. In order to realize the research objective, this study collected 300 copies of data from the current Poomsae athletes at universities by using a convenient sampling method. Then, excluding the 41 copies of data considered to be untrustworthy, PASW/PC 25.0 ver. was used on 259 copies of data to perform frequency analysis, exploratory factor analysis, reliability analysis, and multiple regression analysis. Based on the results, this research confirmed that LMX and the athlete’s life satisfaction play a significant role in the university Poomsae athletes’ intention to continue exercising, to the extent that LMX would function as the most practical method to prevent any university athletes from leaving through the direct impact it has on the intention to continue exercising and the indirect impact from the athlete’s life satisfaction. Also, suggestions should be explored further on the necessity to seek promotional plans to enhance the quality of interaction between the leader of the university Poomsae team and the team members on a more practical level.
고교생들의 학교스포츠클럽 참여만족이 학교생활에 미치는 영향
지호철(Ji, Ho-Chul),김하영(Kim, Ha-Young) 한국체육과학회 2018 한국체육과학회지 Vol.27 No.6
The purpose of this study was to provide the basic information whether participation in sports club activities of high school has positive impacts on the decrease of school violence behavior and the improvement of school life satisfaction and learning activity.A total 231 students who are enrolled in 3 high schools located in Seoul participated in this study. The participants completed a questionnaire and collected data were analyzed to use LSD independent sample t-test, one-way ANOVA, and multiple regression analysis.The results revealed that students` participation satisfaction in sports club activities had positive effects on the decrease of school violence behavior, the enhancement of school life satisfaction, and learning activity for school subjects.The findings pvovide some practical implications for school teachers, researchers, and people who are related to school policy and administration.
베트남 기업 지배구조의 변화와 경쟁력: 비나카페의 주식회사화 전략
지호철 ( Ho Chul Ji ),이승철 ( Sung Cheol Lee ) 한국경제지리학회 2015 한국경제지리학회지 Vol.18 No.4
Since the late 1990s Vinacafe has gone through strategic changes in corporate governance and managements due to an increase in the introduction of coffee MNCs, a growth of global demands in sustainable coffee, aging coffee tree, and the deterioration of coffee production with climate changes in Vietnam. Vinacafe has attempted to cope with these kinds of changes through strategies for equitization. Therefore, the main aim of this paper is to identify strategies for enhancing the competitiveness of the Vietnamese coffee industry by investigating changes in corporate governance and processes of coffee production and distribution. The equitization of Vina cafe has led to the enhancement of coffee competitiveness in two perspectives. Firstly, as it has decentralized decision-making from headquarter, subsidiaries have become able to strength their competitiveness themselves by introducing new technologies, improving coffee quality, and encouraging the introduction of eco-friendly production methods through cooperative relationships with stakeholders involved in coffee production and distributions in Vietnam. Secondly, it has also enhanced competitiveness through the diversification and effectiveness of coffee managements by intensifying the flexibility of contract with coffee farmers and diversifying coffee sales and supply chains in Vietnam.