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Projector 회로 소음 및 진동 저감의 실험적 연구
최영수(Youngsoo Choi),송근영(Keunyoung Song),이종권(Jongkwon Yi),오홍렬(Honglyeol Oh),이승규(Seunggyu Lee) 한국소음진동공학회 2013 한국소음진동공학회 학술대회논문집 Vol.2013 No.4
This paper deals with noise reduction on a light source driving board in a projector. We analyze causes of noise/vibration in the circuit with the present increasing use of LD and LED driving boards. The main source of noise is the MLCC in the driving board. Our aim is to investigate how the mechanical arrangement of the circuit elements affects noise reduction. The result of our experiment shows that noise can be reduced by symmetrical arrangement and slots in PCB. This result is expected to facilitate a variety of applications for manufactures without a need to change circuit elements.
국내 인체피부모델을 이용한 광독성 동물대체시험법 개발 연구
이용선 ( Yong-sun Lee ),이정선 ( Jung-sun Yi ),임혜림 ( Hye-rim Lim ),김태성 ( Tae-sung Kim ),안일영 ( Il-young Ahn ),고경육 ( Kyung-yuk Ko ),김주환 ( Joo-hwan Kim ),박혜경 ( Hye-kyung Park ),이종권 ( Jong-kwon Lee ),손수정 ( Soo- 한국동물실험대체법학회 2016 동물실험대체법학회지 Vol.10 No.1
Human reconstituted epidermis models have been widely used in evaluating phototoxicity. However, human reconstituted epidermis models made in Korea have not been employed to assess phototoxicity. In this study, we conducted an in vitro phototoxicity test with Neoderm<sup>®</sup>-E, human reconstituted epidermis model from Korea, in order to see if the model could be used for the evaluation of phototoxicity. Firstly, we performed an UVA sensitivity test and selected 6 J/cm<sup>2</sup> for an UVA irradiation dose. Chlorpromazine as a positive control was then tested to confirm that the substance induces phototoxicity in this model. Afterwards, 3 phototoxins and 2 non-phototoxins were tested using Neoderm<sup>®</sup>-E and Epiderm<sup>TM</sup>, a generally used phototoxicity test model, to compare prediction results for each chemical. The results indicated that all those 5 chemicals were correctly predicted with Neoderm<sup>®</sup>-E, which was accordant with the phototoxic information on them. However, only 3 chemicals were correctly predicted with Epiderm<sup>TM</sup>. Consequently, the predictive capacity of the test with Neoderm<sup>®</sup>-E could be higher than that using Epiderm<sup>TM</sup>. Overall, we reached the conclusion that Neoderm<sup>®</sup>-E could be used in evaluating phototoxicity.
최영수(Choi, Youngsoo),송근영(Song, Keunyoung),이종권(Yi, Jongkwon),오홍렬(Oh, Honglyeol),이승규(Lee, Seunggyu) 한국소음진동공학회 2013 한국소음진동공학회 논문집 Vol.23 No.6
This paper deals with noise reduction on a light source driving board in a projector. We analyze causes of noise/vibration in the circuit with the present increasing use of LD and LED driving boards. The main source of noise is the MLCC in the driving board. Our aim is to investigate how the mechanical arrangement of the circuit elements affects noise reduction. The result of our experiment shows that noise can be reduced by symmetrical arrangement and slots in PCB. This result is expected to facilitate a variety of applications for manufactures without a need to change circuit elements.
메스암페타민 자발섭취가 흰쥐 뇌조직 중 세로토닌 수용체에 미치는 영향
박기숙(Ki Sook Park),홍진태(Jin Tae Hong),한진이(Jin Yi Han),김혜진(Hye Jin Kim),김용규(Yong Kyu Kim),이종권(Jong Kwon Lee),안광수(Kwang Soo Ahn),이선희(Sun Hee Lee) 한국응용약물학회 2001 Biomolecules & Therapeutics(구 응용약물학회지) Vol.9 No.2
(+)-Methamphetamine (METH) is a psychostimulant, which has been the most popular abused drug in Korea. The rewarding mechanism in METH abuse has been reported to be mediated by dopaminergic system. Recently, it has been reported that dopamine releaser (phentermine) plays a dominant role in the discriminative stimulus effects of METH, whereas 5-HT releaser (fenfluramine) can strongly modify METH selfadministration. The present study is designed to assess the behavioral changes and the changes of the serotonin receptors in the brains of rats administered repeated or self-administered METH. The repeated administration of 1.0 ㎎/㎏/day METH for 12 days increased locomotor activities, and there was no difference between i.v. and i.p. treatment. Rats had actively acquired METH self-administration for 3 weeks at 0.1 or 0.2 mg/kg/injection. Whereas, it was taken few days to acquire sucrose pellet self-administration. The binding of [³H]-8-hydroxy-DPAT (5-HT_(1A) receptors) and [³H]-5-carboxytryptamine (5-HT_(1B) receptors) to brain sections was examined. Both passive administration and self-administration of METH did not change significantly the serotonin receptors levels in hippocampus, striatum and nucleus accumbens. These results suggest that serotonin receptors may not change in the acquisition period of METH self-administration, and we are trying to investigate the serotonin receptors levels of brain in rats maintained of METH self-administration.
이종권,예윤혜 경희대학교 레이저공학연구소 2004 레이저공학 Vol.15 No.-
A new configuration for white light interferometric sensor is implemented. This sensor employs a fiber Michelson interferometer(MI) for path-matching and an Fabry-Perot (FP) interferometer for sensing physical parameters. The interference condition can be met by varying the OPD of MI using PZT actuators. With an FP interferometer of 0.85㎝ cavity length and a 1550㎚ ASE source, the resolution of the system was measured to be 0.017℃/scale. A proposed algorithm is used to locate the position of the central fringe with 49.8㎚/√Hz random walk.