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Fe계 Norem 02 경면처리 합금의 고압.수중 마모거동
이권영,오영민,이민우,김선진,Lee, Kwon-Yeong,Oh, Young-Min,Lee, Min-Woo,Kim, Seon-Jin 한국재료학회 2002 한국재료학회지 Vol.12 No.8
The sliding wear behavior of an iron-base NOREM 02 hardfacing alloy was investigated in the temperature range of $25~250^{\circ}C$ under a contact stress of 103MPa (15ksi). With increasing temperature, the wear loss of Norem 02 in water increased slightly up to $180^{\circ}C$ at which Norem 02 showed the wear loss of 2.1mg. The wear resistance of Norem 02 resulted from the surface hardening due to the strain-induced phase transformation from austenite to $\alpha$'martensite during sliding wear. The wear loss of Norem 02 was smaller in water compared to air at same temperature because the water could be served as a sort of lubricant. The wear mode of NOREM 02 changed abruptly to severe adhesive wear at $190^{\circ}C$ and galling occurred above $200^{\circ}C$. It was caused that the strain- induced phase transformation took place below $180^{\circ}C$ while not above $190^{\circ}C$. Therefore, Norem 02 was considered to be inadequate at high temperature service area.
Fe-Cr-C-Si 계 경면처리 합금의 고압ㆍ수중 마모거동
이권영,이민우,오영민,김영석,김선진,Lee, Kwon-yeong,Lee, Min-Woo,Oh, Young-Min,Kim, Seon-Jin 한국재료학회 2003 한국재료학회지 Vol.13 No.4
The sliding wear behavior of a Fe-base hardfacing alloy was investigated in the temperature range of $25∼250^{\circ}C$ under a contact stress of 15 ksi (103 MPa). The wear loss of this Alloy in pressurized water was less than that of NOREM 02. And galling did not occurred at this alloy in all temperature ranges. It was considered that the wear resistance of this Alloy was attributed to the strain-induced phase transformation from austenite to $\alpha$'martensite during sliding wear.
의료서비스에서 대기 관리 활동이 소비자의 부정적 감정과 고객 충성도에 미치는 영향
이권영(Lee, Kwon-Young),김용철(Kim, Yong-Cheol) 글로벌경영학회 2019 글로벌경영학회지 Vol.16 No.2
본 연구의 목적은 의료서비스 산업에서 소비자의 지각된 대기와 관련된 변수들이 소비자의 감정 반응과 고객 충성도에 미치는 영향을 실증 분석하는 데 있다. 장이론이 주장하는 포괄적 맥락의 필요성에 입각하여, 그간 부분적으로 검토되어 오던 지각된 대기 관련 변수들을 종합적으로 실증하였다. 구체적으로 대기 공정성, 대기 환경 매력도, 대기 이유 설명, 대기 근심 등에 대한 소비자 인식이 소비자의 부정적 감정 및 고객 충성도에 미치는 영향을 분석하였다. 또한 의료서비스의 특성을 고려할 때 중요한 맥락 중 하나라고 판단되는 관여도의 조절효과도 검증하였다. 자료 수집은 세 곳의 종합병원에서 외래환자와 해당 병원 이용경험자를 대상으로 이루어졌으며, 총 353부의 응답 자료가 분석에 활용되었다. 실증 모델을 검증하기 위해 AMOS를 이용한 구조방정식 모델(structural equation modeling) 분석을 실시하였다. 분석 결과, 대기 공정성, 대기 환경 매력도, 대기 이유 설명, 대기 근심은 모두 대기로 인한 부정적 감정에 영향을 미치는 것으로 나타났다. 그리고 소비자들이 경험하는 부정적 감정은 고객 충성도에 영향을 미치는 것을 확인하였다. 또한 의료서비스에 대한 소비자의 관여도가 높을수록 대기 공정성이 부정적 감정에 미치는 영향력은 더욱 커지는 것으로 나타났다. 이를 바탕으로 의료서비스 실무자들에게 제언할 수 있는 효과적인 대기 관리 활동에 관한 시사점들이 도출되었다. The purpose of this study is to synthesize the variables related to management of perceived waiting in the medical service industry and to analyze the effect of these variables on consumers emotional response and customer loyalty. Based on the necessity of comprehensive context claimed by field theory, we have comprehensively verified the perceived waiting related variables that have been partially examined. Specifically, we analyzed the effects of perceived justice, environment attractiveness, reason explanation, and anxiety on consumers negative emotion and customer loyalty. We also analyzed the moderating effect of the involvement, which is considered to be one of the important context, when considering the characteristics of the medical service. Data collection was conducted for outpatients and hospital users in three general hospitals. A total of 353 responses were used for the analysis. To verify the empirical model, structural equation modeling analysis using AMOS was performed. The results show that perceived justice, environment attractiveness, reason explanation, and anxiety all affect the negative emotions caused by waiting and negative emotions affect consumers loyalty. Also, perceived justice has a greater influence on negative emotions as consumers involvement in health care services is higher. Based on these results, implications for effective management activities of perceived waiting were suggested.
이재진(Jae-Jin Lee),최동녁(Dong-Nyeok Choi),김영완(Young-Wan Kim),최승(Seung Choi),박유라(Yu-Ra Park),이진구(Jingoo Lee),이권영(Kwon-Yeong Lee) 한국자동차공학회 2020 한국자동차공학회 부문종합 학술대회 Vol.2020 No.7
The heat generated from the heat source of an automotive headlamp, is transferred to the lamp’s reflector and lens in the form of conduction, convection and radiation. The transferred heat causes deformation of lamp’s materials when it exceeds the heat-resistance limits of its material, thus the design needs to be done in the range of the limits. In case of failing the heat-resistance test after designing and producing a headlight, the design process should start all over again, requiring a lot of time and cost. However, when the design is proceeded with the simulation results using a temperature prediction program, the time and cost spent on the production would be reduced. The previous data based program showed large errors. Accordingly, new prediction program based on three heat transfer mechanisms has to be developed, which should be similar to CFD results but fast. The Beta version was made covering for a simplified cuboid headlamp. With the help of CFD, the simulation is being updated, minimizing the difference between the result of CFD and simulation in order to get reliability.
최동녁(Dong-Nyeok Choi),유재영(Jae-Young Yu),권장상(Jang-Sang Kwon),이우빈(U-Bin Lee),피경진(Kyeong-Jin Pi),손창현(Chang-Hyun Son),이재영(Jaeyoung Lee),이권영(Kwon-Yeong Lee),성주헌(Ju-Hun Sung) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
Supercritical carbon dioxide (s-CO₂) refers to carbon dioxide that has both liquid and gas properties and can be applied to a power generation system that increases efficiency of generation while reducing the size of core machines. In particular, this study was planned to consider the possibility of applying s-CO cycles to solar systems, one of the new and renewable energies that has recently been under spotlight. For this plan, we try to design and manufacture a 15 kWth small s-CO₂ cycle experimental apparatus. First, we completed to draw T-s diagram after identifying the properties of each section of the s-CO₂ Brayton cycle through the ‘REFPROP 7.0’. Based on them, we drew Flow Diagram and Heat and Mass Balance Diagram for the cycle. Requirements have been created to select the suitable devices for the small s-CO₂ cycle experimental facility.
소원호(Won-Ho So),이정민(Jeong-Min Lee),조경찬(Kyung-Chan Cho),성주헌(Ju-Hun Sung),이재영(Jae-Young Lee),이권영(Kwon-Young Lee) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.11
The paper focuses on design of a small-scale s-CO2 test loop of about 12㎾ with solar heat as a heat source and the characteristic study of carbon dioxide through theoretical research, stabilization and optimization of experimental facilities. The thermodynamic cycle of the experimental facility is a Rankine cycle (transcritical cycle) in which liquid, gas and supercritical CO2 all exist due to limitations on the component side. The components of the experimental equipment are typically made up of pump, heater, relief valve, cooler, gas booster, air compressor, chiller, etc. To raise the cycle efficiency of the experimental facility, the optimum turbine inlet temperature and pressure were obtained, and the maximum efficiency of 18.84% was derived by simulating the introduction of IHX (internal heat exchanger).
초소수성 특성을 갖는 다중 구리관의 응축 열전달에 관한 시각화 실험 연구
류한솔(Han Sol Ryu),이민형(Min Hyung Lee),신영훈(Young Hun Shin),이권영(Kwon Young Lee),황운봉(Un Bong Hwang) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
The purpose of this research is to improve the condensation heat transfer performance for improving the efficiency of the condenser. And the research for the improvement of condensation heat transfer performance was conducted by using the hydrophobic coated tubes. In this research, a thermoelectric device called Thermal Electric Cooler (TEC) was used to solve the complexity and the size of the experimental devices, which are the problems of the existing research. The research on the hydrophobic multi-tube and the droplet behavior between the tubes, which were not conducted in the previous research, was conducted. And the heat transfer coefficient and the droplet behavior of hydrophobic tubes was analyzed and compared with those of the bare copper tubes. As a result of the analysis, it can be seen that the hydrophobic coated tube has better heat transfer performance than the bare copper tube. It is predicted that the use of superhydrophobic will solve the energy efficiency problem.
초소수성 특성을 갖는 다중 구리관의 응축 열전달에 관한 시각화 실험 연구
류한솔(Han Sol Ryu),이민형(Min Hyung Lee),신영훈(Young Hun Shin),이권영(Kwon Young Lee),황운봉(Un Bong Hwang) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
The purpose of this research is to improve the condensation heat transfer performance for improving the efficiency of the condenser. And the research for the improvement of condensation heat transfer performance was conducted by using the hydrophobic coated tubes. In this research, a thermoelectric device called Thermal Electric Cooler (TEC) was used to solve the complexity and the size of the experimental devices, which are the problems of the existing research. The research on the hydrophobic multi-tube and the droplet behavior between the tubes, which were not conducted in the previous research, was conducted. And the heat transfer coefficient and the droplet behavior of hydrophobic tubes was analyzed and compared with those of the bare copper tubes. As a result of the analysis, it can be seen that the hydrophobic coated tube has better heat transfer performance than the bare copper tube. It is predicted that the use of superhydrophobic will solve the energy efficiency problem.