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코로나19 뉴스 프레임이 개인에 대한 처벌 정책 지지에 미치는 영향 : 책임 인식과 분노의 매개효과
최종혁(Jonghyeok Choi),소지연(Jiyeon So) 한국언론학회 2021 한국언론학보 Vol.65 No.4
This study examined the role of news frames in influencing cognitive and emotional responses to an emerging infectious disease and their effects on related policy support. Specifically, we selected episodic frame and thematic frame as the main frames of news coverage on COVID-19 and conducted an online experiment. The results showed that an episodic frame had greater effects on the perception of individuals’ responsibility than a thematic frame, and that perception of individuals’ responsibility, in turn, led to greater levels of anger. Overall, the episodic frame led to greater support toward punitive policy through perceived responsibility and anger. Based on the results of these analyses, this study reaffirmed the differences in the roles of episodic and thematic news frames on perceptions of responsibility and explained the differential framing effects on policy support by examining a mechanism involving individuals’ cognitive and emotional responses to emerging infectious diseases news.
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저 레이놀즈 수에서 이동하는 생체모사익의 추력 생성 및 추진효율
최종혁(Jonghyeok Choi),맹주성(Joosung Maeng),한철희(Cheolheui Han) 한국전산유체공학회 2009 한국전산유체공학회 학술대회논문집 Vol.2009 No.11
In this paper, the fluid dynamic forces and performances of a moving airfoil in the low Reynolds number flow is addressed. In order to calculate the necessary propulsive force for the moving airfoil in a low Reynolds number flow, a lattice-Boltzmann method is used. The critical Reynolds and Strouhal numbers for the thrust generation are investigated for the four propulsion types. It was found that the Normal P&D type produces the largest thrust with highest efficiency among the investigated types. The leading edge of the airfoil has an effect of deciding the force production types, whereas the trailing edge of the airfoil plays an important role in augmenting or reducing the instability produced by the leading edge oscillation. It is believed that present results can be used to decide the optimal propulsion devices for the given Reynolds number flow.
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유철호(Chulho Yu),최종혁(Jonghyeok Choi),이용균(Yonggyun Yi),이내현(Naehyun Lee),노석홍(Seokhong NOh),최규훈(Kyuhoon Choi) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_1
The automobile industry has devoted considerable effort to increasing the thermal efficiency of gasoline engines. Extensive research and development efforts have been concentrated on establishing the combustion concept of Spark-ignited direct injection engine for the past fifty years.<br/> Recently, both growing attention towards energy saving and rapid progress in micro-computers and sensor technologies have aroused the intereets in SDI systems.<br/> In this paper, a newly developing KIA SDI engine is introduced. This SDI engine solved the problems in the past SDI engine with new technologies such as tumble port, piston with spherical cavity, high pressure fuel injection system. Further description is given about combustion characteristics, tuel economy and exhaust emission performance.<br/>
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저 레이놀즈 수에서 이동하는 생체모사익의 추력 생성 및 추진효율
안상준(Sangjoon An),최종혁(Jonghyeok Choi),맹주성(Joosung Maeng),한철희(Cheolheui Han) 한국전산유체공학회 2010 한국전산유체공학회지 Vol.15 No.2
In this paper, the fluid dynamic forces and performances of a moving airfoil in the low Reynolds number flow is addressed. In order to simulate the necessary propulsive force for the moving airfoil in a low Reynolds number flow, a lattice-Boltzmann method is used. The critical Reynolds and Strouhal numbers for the thrust generation are investigated for the four propulsion types. It was found that the Normal P&D type produces the largest thrust with the highest efficiency among the investigated types. The leading edge of the airfoil has an effect of deciding the force production types, whereas the trailing edge of the airfoil plays an important role in augmenting or reducing the instability produced by the leading edge oscillation. It is believed that present results can be used to decide the optimal propulsion types for the given Reynolds number flow.
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천호정(Hojeong Cheon),김재환(Jaehwan Kim),최종혁(Jonghyeok Choi) 한국해양환경·에너지학회 2022 한국해양환경·에너지학회 학술대회논문집 Vol.2022 No.11
파력발전장치의 높은 변동성을 저감하기 위해 다양한 파력발전장치의 개발에 유압식 에너지변환장치가 도입되고 있다. 유압식 에너지변환장치는 파력발전장치 에너지입력부의 기계적인 에너지를 전기적인 에너지로 변환하는 발전기 사이에 위치하고 있다. 이러한 파력발전장치의 다물리계 구성특성과 높은 변동성으로 인해 유압식 에너지변환장치의 성능예측은 어려움이 많다. 성능예측 어려움을 해결하기 위해 유압시스템의 수치해석기법을 도입하였다. 또한, 유압시스템의 수치해석 결과를 토대로 시제품을 만들고 이를 전용의 성능시험장치를 통해 검증하였다. 일련의 과정으로 검토된 설계파라미터의 분석을 바탕으로 더욱 고도화된 수치모델을 개발하고 사실적인 성능의 검토가 수행될 수 있었다. 본 연구에서는 기존에 설계되었던 파력발전용 유압식 에너지변환장치의 효율성과 신뢰도를 향상시키기 위해 유량제어 밸브를 도입하였고, 유량제어 밸브의 영향을 분석하기 위해 유압회로의 고도화된 수치모델을 구현하였다. 이를 통해 다양한 조건에서의 수치해석을 수행하였다. 연구결과 유압회로에서의 유량제어 밸브가 시스템의 효율상승 뿐만 아니라, 발전기의 보호장치 및 발전운영의 개선 측면에서 다양하게 활용 될 수 있음을 확인하였다. In order to reduce the high variability of the wave energy converter, a hydraulic energy conversion device has been introduced in the development of various wave energy converter. The hydraulic energy conversion device is located between the generators that convert the mechanical energy of the energy input part of the wave energy converter into electrical energy. It is difficult to predict the performance of the hydraulic energy conversion device due to the multiphysics configuration characteristics and high variability of the wave energy converter. In order to solve the performance prediction difficulty, a numerical analysis technique of the hydraulic system was introduced. In addition, a prototype was made based on the results of numerical analysis of the hydraulic system and verified through a dedicated performance test device. Based on the analysis of the design parameters reviewed in a series of processes, a more advanced numerical model could be developed and a realistic performance review could be performed. In this study, a flow control valve was introduced to improve the efficiency and reliability of the hydraulic energy conversion device for wave power, which was previously designed and To analyze the effect of the flow control valve, an advanced numerical model of the hydraulic circuit was implemented. Through this, numerical analysis was performed under various conditions. As a result of the study, it was confirmed that the flow control valve in the hydraulic circuit can be used in various ways not only to increase the efficiency of the system, but also to improve the protection device and power generation operation of the generator.
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천호정(Hojeong Cheon),김재환(Jaehwan Kim),최종혁(Jonghyeok Choi),권영준(Youngjun Kwon) 한국해양환경·에너지학회 2021 한국해양환경·에너지학회 학술대회논문집 Vol.2021 No.10
파력을 이용한 발전장치의 설계에서 가장 중요한 요소는 변동성의 저감과 높은 외력에서의 신뢰성이다. 파도는 파고, 주기, 파향에 따른 지속적인 변동성을 가진다. 이를 에너지원으로 이용하기 위해서는 다양한 변동성에 대한 대응이 원활하게 이루어지는 시스템의 설계가 반드시 필요하다. 본 연구에서는 파력발전장치의 변동성을 저감하기 위한 유압식 에너지변환장치를 설계하였고, 이에 대한 검증을 위해 수치해석과 전용의 육상시험장치를 이용한 성능시험을 수행하였다. 수치해석을 수행하기 위해 상용소프트웨어인 Amesim을 도입하였고, 다양한 입력환경에서의 부하에 따른 시스템의 특성을 확인 할 수 있었다. 이를 토대로 제작된 시제품을 육상시험장치를 활용하여 성능시험을 수행하였다. 시험결과 시스템의 효율과 신뢰성을 확인 할 수 있었다. 이러한 연구결과는 향후 진행될 파력발전의 상용화에 중요한 자료로 활용될 예정이다. The most important factors in the design of a wave energy convertor using wave power are the reduction of variability and reliability under high external force. Waves have constant variability according to wave height, period, and wave direction. In order to use it as an energy source, it is essential to design a system that smoothly responds to various variability. In this study, a hydraulic energy conversion device was designed to reduce the variability of the wave power plant, and a numerical analysis and performance test using a dedicated shop test device were performed to verify this. Amesim, a commercial software, was introduced to perform numerical analysis, and the characteristics of the system according to the load in various input environments were confirmed. A performance test was performed on the manufactured prototype using a shop test device. As a result of the test, it was possible to confirm the efficiency and reliability of the system. These research results will be used as important data for the commercialization of wave power in the future.
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천호정(Hojeong Cheon),김재환(Jaehwan Kim),최종혁(Jonghyeok Choi) 한국해양환경·에너지학회 2022 한국해양환경공학회 학술대회논문집 Vol.2022 No.6
파력발전장치의 에너지 흡수부는 타 신재생에너지원과 다르게 에너지변동폭이 매우 크다. 이러한 에너지 흡수부를 모사하기 위해 다양한 시도가 계속되었지만, 표준화 되어 있는 시험방법은 존재하지 않는다. 이를 보완하기 위해 유압식 파워팩을 기반으로 하고, 회전식 베인펌프를 활용한 파랑에너지의 입사를 모사하기 위한 전용의 시험기를 개발하였다. 파랑에너지의 변동을 모사하기 위한 밸브블럭을 설계하였고, 유량제어밸브, 릴리프밸브를 이용해 입사되는 파랑에너지를 구현하였다. 규칙파, 불규칙파 파랑 입력에너지를 구현하기 위하여, 비례제어식 유량제어밸브를 도입하여 시험자가 요구하는 파고, 주기를 모사할 수 있게 개발하였다. 또한, 유압식 에너지변환장치에 직접 입력되는 유압에너지 뿐만 아니라, 1차에너지 흡수장치의 형태에 따라 유압파워팩을 거쳐 발생된 유압에너지를 RVM(회전식 베인 모터, Rotary Vane Motor)를 통해 회전 왕복운동하는 기계에너지 형태로 변환하여 에너지 형태를 모사할 수 있게 개발하였다. 본 연구를 통해 제작된 육상용 시험기는 실해역 시험이전에 파력발전장치의 성능을 확인하기 위해 사용될 계획이다. The energy absorbing part of the wave energy converter has a very large energy fluctuation range, unlike other renewable energy sources. Various attempts have been made to simulate this energy absorbing part, but there is no standardized test method. To supplement this, based on a hydraulic power pack, a dedicated tester was developed to simulate the incidence of wave energy using a RVP(Rotary Vane Pump). A valve block was designed to simulate fluctuations in wave energy, and incident wave energy was realized using flow control valves and relief valves. In order to realize regular and irregular wave input energy, a proportional control type flow control valve was introduced and developed to simulate the wave height and period required by the tester. In addition, not only the hydraulic energy directly input to the hydraulic energy converter, but also the hydraulic energy generated through the hydraulic power pack according to the type of the primary energy absorbing device is rotated and reciprocated through the RVM (Rotary Vane Motor). The onshore test bench manufactured through this study is planned to be used to check the performance of the wave energy converter before the actual sea test.
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