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차량용 에어필터 Sealing 및 상.하 Cap의 신기술 개발에 관한 연구
윤성운,김재열,Yoon, Sung-Un,Kim, Jae-Yeol 한국생산제조학회 2009 한국생산제조학회지 Vol.26 No.3
An air filter is a device to remove dust from the air supplied to the automotive engine. A requirement for the optimum air filter is to improve the capability to remove particles from the air it takes in, that is the efficiency and amount of dust collection. By removing dust from the air, the air filter prevents the engine cylinder from wear, reduces ventilation resistance, and thus improves engine output and guarantees intake performance. In order to guarantee such air filter performance, it is very important to properly seal the air filter. For passenger cars made in Korea, the air filters are fabricated with steel caps as their frames are large and their engine capacity is big. Recently however, European countries and Japan started using urethane for manufacturing the air filter, so that all foreign-made cars now have urethane filters. The urethanes used for air filters are applied in two ways: One is to use soft urethane for both top and bottom of the air filter and the other is to use soft urethane for the top and hard urethane for the bottom. Each of these method has unique problems. In this study, hard urethane is used for both top and bottom of the filter in order to improve those problems and increase the sealing efficiency. Especially for the top, NBR (rubber mold) is pre-settled in tough urethane and then the urethane is solidified through foaming, which makes it possible to develop a solid and double-sealed filter.
윤성운(Sung-Un Yoon),김재열(Jae-Yeol Kim),송경석(Kyung-Seok Song),차용훈(Yong-Hun Cha) 한국생산제조학회 2006 한국생산제조학회지 Vol.15 No.2
This paper supplements shortcoming of radioactivity check by detecting defect of SWP weld zone using ultrasonic wave. Manufacture 2 stage robot detection systems that can follow weld bead of SWP by method to detect weld defects of SWP that shape of weld bead is complex for this as quantitative. Also, through signal processing ultrasonic wave defect signal system of GUI environment that can grasp easily existence availability of defect because do videotex compose. Ultrasonic wave signal of weld defects develops artificial intelligence style sightseeing system to enhance pattern recognition of weld defects and the classification rate using neural net. Classification of weld defects that do fan Planar defect and that do volume defect of by classify.
용접결함의 패턴인식을 위한 분류기 알고리즘의 성능 비교
윤성운(Sung-Un Yoon),김창현(Chang-Hyun Kim),김재열(Jae-Yeol Kim) 한국생산제조학회 2006 한국생산제조학회지 Vol.15 No.3
In this study, we nodestructive test based on ultrasonic test as inspection method and compared backpropagation neural network(BPNN) with probabilistic neural network(PNN) as pattern recognition algorithm of welding flasw. For this purpose, variables are applied the same to two algorithms. Where, feature variables are zooming flaw signals of reflected whole signals from welding flaws in time domain. Through this process, we confirmed advantages/disadvantages of two algorithms and identified application methods of two algorithms.
히트싱크의 핀 배열에 따른 냉각특성에 관한 실험적 연구
윤성운(Sung-Un Yoon),김재열(Jae-Yeol Kim),고가진(Jia-Chen Gao) 한국기계가공학회 2018 한국기계가공학회지 Vol.17 No.1
In general, the operating temperature of electronic equipment is closely related to product life and reliability, and it is recognized that effectively cooling the parts is an important problem. In this paper, an experimental study on the cooling characteristic according to the pin array of the heat sink is conducted. The experiment on the heat sink was based on the natural convection and temperature distribution changes. The experimental results indicate that the pin array of the heat sink has an effect on the thermoelectric module’s cooling characteristic.
근적외선 분광기술을 이용한 휴대용 감귤 당도 선과기 성능특성에 관한 연구
윤성운(Sung-un Yoon),김재열(Jae-yeol Kim),마상동(Sang-Dong Ma),김명윤(Myung-yun Kim) 한국생산제조학회 2006 한국생산제조학회지 Vol.15 No.5
The purpose of this study is to develop to portable near infrared analyzer measuring the sugar content of the fruits on a tree before harvesting ones. The portable near infrared system consists of a tungsten lamp, a coaxial optical fiber bundle and a multi-channel detector, which has 256 pixels and a concave transmission grating. Reflectance NIR spectra of orange were recorded by using a coaxial optical fiber bundle. The spectra were collected over the spectral range 400~1100㎚. Partial least squares regression(PLSR) was applied for a calibration and validation for determination of sugar contents. The multiple correlation coefficient was 0.99 and standard errors of calibration(SEC) was 0.069 brix. The calibration model predicted the sugar content for validation set with standard errors of prediction(SEP) of 0.092 brix. The sugar content in fruits was successfully quantified using the portable near infrared analyzer.
차량용 에어필터 Sealing 및 상·하 Cap의 신기술 개발에 관한 연구
윤성운(Sung-Un Yoon),김재열(Jae-Yeol Kim) 한국생산제조학회 2009 한국생산제조학회지 Vol.18 No.4
An air filter is a device to remove dust from the air supplied to the automotive engine. A requirement for the optimum air filter is to improve the capability to remove particles from the air it takes in, that is the efficiency and amount of dust collection. By removing dust from the air, the air filter prevents the engine cylinder from wear, reduces ventilation resistance, and thus improves engine output and guarantees intake performance. In order to guarantee such air filter performance, it is very important to properly seal the air filter. For passenger cars made in Korea, the air filters are fabricated with steel caps as their frames are large and their engine capacity is big. Recently however, European countries and Japan started using urethane for manufacturing the air filter, so that all foreign-made cars now have urethane filters. The urethanes used for air filters are applied in two ways: One is to use soft urethane for both top and bottom of the air filter and the other is to use soft urethane for the top and hard urethane for the bottom. Each of these method has unique problems. In this study, hard urethane is used for both top and bottom of the filter in order to improve those problems and increase the sealing efficiency. Especially for the top, NBR (rubber mold) is pre-settled in tough urethane and then the urethane is solidified through foaming, which makes it possible to develop a solid and double-sealed filter.
초음파 서모그래피를 적용한 가솔린 엔진 피스톤 균열에 대한 비파괴 신뢰성평가
김성현(Sung-Hyun Kim),양용하(Yong-Ha Yang),최승현(Seung-Hyun Choi),김재열(Jae-Yeol Kim),윤성운(Yoon-Sung Un) 한국생산제조학회 2010 한국공작기계학회 추계학술대회논문집 Vol.2010 No.-
Ultrasound thermography detects defects by radiating 20-30 ㎑ ultrasound waves to the samples and capturing the heat generated from the defects with the use of an infrared thermographic camera. This technology is being spotlighted as a next-generation NDT technique for the automobile and aerospace industries because it can test large areas and can detect defects such as cracks and exfoliations in real time. The heating mechanism of the ultrasound vibration has not been accurately determined, but the thermomechanical coupling effect and the surface or internal friction are estimated to be the main causes. When this heat is captured by an infrared thermographic camera, the defects inside or on the surface of objects can be quickly detected. Although this technology can construct a testing device relatively simply and can detect defects within a short time, there are no reliable data about the factors related to its detection ability. In this study, the ultrasound thermography technique was used to manufacture gasoline engine piston specimens, and nondestructive reliability tests to verify the applicability and validity of the ultrasound thermography technique.
초음파 서모그래피를 적용한 가솔린 엔진 피스톤 균열에 대한 비파괴 신뢰성평가
김성현(Sung-Hyun Kim),양용하(Yong-Ha Yang),최승현(Seung-Hyun Choi),김재열(Jae-Yeol Kim),윤성운(Yoon-Sung Un) 한국생산제조학회 2010 한국생산제조시스템학회 학술발표대회 논문집 Vol.2010 No.10
Ultrasound thermography detects defects by radiating 20-30 ㎑ ultrasound waves to the samples and capturing the heat generated from the defects with the use of an infrared thermographic camera. This technology is being spotlighted as a next-generation NDT technique for the automobile and aerospace industries because it can test large areas and can detect defects such as cracks and exfoliations in real time. The heating mechanism of the ultrasound vibration has not been accurately determined, but the thermomechanical coupling effect and the surface or internal friction are estimated to be the main causes. When this heat is captured by an infrared thermographic camera, the defects inside or on the surface of objects can be quickly detected. Although this technology can construct a testing device relatively simply and can detect defects within a short time, there are no reliable data about the factors related to its detection ability. In this study, the ultrasound thermography technique was used to manufacture gasoline engine piston specimens, and nondestructive reliability tests to verify the applicability and validity of the ultrasound thermography technique.
김재열(Jae-Yeol Kim),윤성운(Sung-Un Yoon),홍성훈(Sung-Hoon Hong),유홍연(Hong-Yeon Yoo),김창현(Chang-Hyun Kim) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
Availability of defect test algorithm that recognizes exact and standardized defect information in order to fundamentally resolve generated defects in industrial sites by giving artificial intelligence to SAT(Scanning Acoustic Tomograph), which previously depended on operator’s decision, to find various defect information in a semiconductor package, to decide defect pattern, to reduce personal errors and then to standardize the test process was verified. In order to apply the algorithm to the lately emerging Neural Network theory, various weights were used to derive results for performance advancement plans of the defect test algorithm that promises excellent field applicability.