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열전소자의 신뢰성평가를 위한 비접촉 공중 초음파 탐상기법의 적용
고가진 ( Jia-chen Gao ),김재열 ( Jae-yeol Kim ),이경일 ( Gyung-il Lee ),김원배 ( Won-bae Kim ) 조선대학교 공학기술연구원 2016 공학기술논문지 Vol.9 No.4
The Thermoelectric Module is a new type of artificial refrigeration technology development on the basis of the discovery in 1834 of Peltier effect. The use of Thermoelectric Module is used as a heat pump has the advantages of no pollution, small size, no noise and other characteristics in line with environmental protection requirements, low power consumption has been widely used in many industries. Thermoelectric Module production from material to product assembly process has certain reference now, but with the application of Thermoelectric Module is more and more widely than before, people`s requirement on the efficiency of Thermoelectric Module and reliability becomes higher. people pay more deep research on the Thermoelectric Module. At present, the research for efficiency of Thermoelectric Module on the international is mainly concentrated in the material. However, the research of materials has certain limit, the research of materials had reached a bottleneck. NAUT (Non-contact Air coupled Ultrasonic Testing) is an inspection technique to remedy the existing contact inspection by supplementing energy loss created by differences of acoustic impedance between the solid and the air with high power ultrasonic Pulser Receiver, PRE-AMP, and high sensitivity probe, and enabling the ultrasonic inspection which uses the air as a medium. As explained above, in this thesis will show you how to use the NAUT to check out the defects inside. According to the scanning picture to judge the position and the size of defects inside. Above all, solved the problem of the detection of joint situation, and this method could give some help to improve the performance of Thermoelectric Module.
승용차 시트 쿨링 & 히팅 모듈의 구조 타당성 검증을 위한 유동 전산모사
고가진(Jia-Chen Gao),박설현(Seul-Hyun Park),마상동(Sang-Dong Ma),김재열(Jae-Yeol Kim) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.2
Due to the special structure of the car seat, the heating and cooling module must be installed in a limited area resulting in difficulty in regards to achieving optimal cooling and heating efficiency. In order to solve these problems, this paper establishes a new structure for heating and cooling modules, verifies the structural feasibility of the thermoelectric module for cooling and heating the seat through fluid simulations, and verifies the proper design of the mechanical components of the thermoelectric module.
고가진(Jia-Chen Gao),김재열(Jae-Yeol Kim) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.12
With the increasing need for environmental protection, it is particularly important to improve the energy saving and reliability of refrigerators. Generally, the cold air flowing into the freezer compartment transits to the bottom of the refrigerating compartment, which can lead to uneven temperature distribution. This paper proposes two design solutions for improving the temperature distribution problem. Of these, the optimal refrigeration design was selected and tested using Computational Fluid Dynamics (CFD) modeling and simulation. The results showed improved uniformity of the temperature distribution inside the refrigerator, thus benefitting food storage while reducing energy consumption.
500W급 광섬유 레이저 출력 전송 모듈 End Cap의 구조 및 열전달 해석
고가진(Jia-Chen Gao),김재열(Jae-Yeol Kim),허상휴(Sang-Hu Heo) 한국기계가공학회 2017 한국기계가공학회지 Vol.16 No.4
In recent years, the optical fiber laser has been widely used in industrial fields due to its excellent economical efficiency and its suitability for industrial applications. This usage has increased even further since the KW class Laser was developed. In this paper, structural analysis and heat transfer analysis of a 500W class optical fiber laser end cap module was performed. The stability of end cap housing with the efficient heat dissipation structure of a 500W-class end cap was evaluated. This research determined the optimal design that should be applied to the design and evaluation of future KW class laser output modules.
4C의 MM Optical Fiber를 수용 가능한 Fiber Guide의 구조해석
정윤수(Yoon-soo, Jung),고가진(Jia-Chen Gao),김재열(Jae-Yeol Kim),유관종(Gwan-Jong You) 한국기계가공학회 2017 한국기계가공학회지 Vol.16 No.6
The use of optical fiber makes it possible to transfer a large amount of data, thereby enabling a high-speed image transmission with a high response speed and a large number of frames. The need for an optical fiber HDMI System has grown in importance due to the rapid development of displays with large sizes and high-resolution images. In this paper, we have studied the structural design and FEM analysis of a 4C fiber guide for hybrid interconnection implementation. According to the structural analysis of the fiber guide, we have confirmed the safety of the design and we will make additional design changes to minimize the optical loss and fabricate a fiber guide for photoelectric composite HDMI in the future.
수동적 적외선 열화상 기법을 적용한 120W급 LED조명등 건전성 평가
정윤수(Yoon-Soo Jung),고가진(Jia-Chen Gao),김재열(Jae-Yeol Kim) 한국기계가공학회 2017 한국기계가공학회지 Vol.16 No.4
As energy conservation and environmental issues are emerging as a hot topic around the world, consumers are demanding high-efficiency, eco-friendly products. In this study, the author proposed 120W LED lighting system that replace metal halide lamp (MHL) which is currently used in the industry. Furthermore, it would be possible to provide a perfect opportunity for Korea to rise as a global leader in the LED lighting industry through soundness evaluation of the LED lighting system that is applied.
Detection and Comparison of Surface Defects in Pipe Welds
Yoon-Soo Jung(정윤수),Jia-Chen Gao(고가진),Tae-Hyoung Ahn(안태형),Jae-Yeol Kim(김재열) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.1
At present, 24 nuclear power plants are in operation nationwide as the main power source responsible for about 27% of Korea"s electricity, and five nuclear power plants are currently under construction. Issues of nuclear safety and reliability have always existed, but after the Fukushima accident, ensuring reliability has become an even more important issue for safety. Compared to other kinds of accidents, the initial response after a nuclear accident is more important than any other accident. Prior to accidents, it is important to be able to predict and judge the accident in advance for the sake of prevention. In this research, non-destructive inspection methods for existing pipe welds include radiographic, ultrasonic, magnetic particle practice , and liquid penetration testing. For this experiment, carbon steel pipes like that of the material used in nuclear pipes were adopted, and specimen welded to the flange (Flange) were manufactured. After testing, the weld specimen were not damaged through the infrared thermography (IRT) experiment. This study attempted to improve the safety of carbon steel pipes through a comparative analysis of finite element analysis.
최철준(Choul-Jun Choi),고가진(Jia-Chen Gao),김재열(Jae-Yeol Kim),정윤수(Yoon-Soo Jung) 한국기계가공학회 2016 한국기계가공학회지 Vol.15 No.4
From the first application of a thermoelectric module to nowtoday, it has been more than half a century. The application of a thermoelectric module is becoming more and more widely accepted since, people"s requirement rely more and more on the efficiency of thermoelectric modules and their reliability become higher and higher. So people pay more and more attention to the thermoelectric module. In Around the world, the more research for into improving the efficiency of thermoelectric modules is focused on the current materials. at present. However, the research of into available materials had has some limitations, and the research of materials had reached a bottleneckthere are limits to current applications. On the other hand, from the production process, if we assembled by materials withoutmodules without any damages and achieve the ideal state of a joint, we can make the a product to maximize performance and have a longer service life. SoTherefore, in this study we will prove the relationship between the any defects inside and the efficiency of a thermoelectric module to improve the quality management and performance of modern thermoelectric modules at present.