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정의효(Ui-Hyo Jeong),형재필(Jae-Phil Hyung),임성용(Seong-Yong Lim),임홍우(Hong-Woo Lim),장중순(Joong-Soon Jang) 한국신뢰성학회 2014 신뢰성응용연구 Vol.14 No.3
Electrodeless lamp is famous for its long life. But its reliability is dependent not only on electrodes but also on materials and structures. To evaluate end product’s reliability, we studied high temperature durability by 60℃, 75 ℃ and 90 ℃ temperature tests, and predicted failure times by an exponential model through regression analysis. However, the test showed that temperature does not affect degradation of electrodeless lamps. Their luminous outputs degrade during the early time of the test (till 250 hours) and then converge to a saturation points. Also, ‘410nm ~ 530nm’ spectrum degrades more than other spectra.
고분자캐패시터에 대한 충방전 조건에서의 온도에 따른 정전용량감소 특성 연구
정의효(Ui-Hyo Jeong),임홍우(Hong-Woo Lim),형재필(Jae-Phil Hyung),고민지(Min-Ji Ko),정창욱(Chang-Uk Jung),조정하(Jeong-Ha Cho),장중순(Joong-Soon Jang) 한국신뢰성학회 2017 신뢰성응용연구 Vol.17 No.1
Purpose: Polymer capacitors are known to have very high reliability as compared with liquid electrolytic capacitors, but their capacity has been reported to decrease in charge and discharge at low temperature. The purpose of this study to clarify these characteristics. Methods: In order to clarify these characteristics, charging-discharging tests were carried out for 200 hours with three different capacities and at 5 different temperature from 5℃ to 100℃. Results: As a result of the test, it was confirmed that the capacity of the polymer capacitor was decreased with higher capacity and lower temperature. Conclusion: Such a failure phenomenon was caused by the shrinkage and expansion characteristics of the polymer used therein, it is presumed that this failure phenomenon is due to the complex pore structure made by etching.
BLDC Motor Driver의 고장 예측에 관한 연구
임성용 ( Seong-yong Lim ),정의효 ( Ui-hyo Jeong ),임홍우 ( Hong-woo Lim ) 조선대학교 공학기술연구원 2016 공학기술논문지 Vol.9 No.2
IIn this paper, we verified the problem of accelerated deterioration of the environmental testing in the BLDC motor driver. Then, we propose the methods to predict the failure on the BLDC Motor. We practice the FMEA and QFD through failure cases that occur in the field. Based on this, We estimate the failure mode failure mechanism. In addition, it was designed environmental test through the failure mode failure mechanism. In order to predict the failure, We will need for a method that can reproduce the failure. In addition, We will need a selection of the predicted value for predicting the failure. We convert the data of the BLDC motor using FFT, and suggests a method of predicting failure.