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연속 파장 가변시 현상론적인 비 선형 이득 포화 효과가 다전극 DBR 레이저의 변조 특성에 미치는 영향
이석,박노헌,박홍이,최원준,한일기,이정일,강광남,Lee, S.,Park, N.,Park, H. L.,Choi, W. J.,Han, I. K.,Lee, J. I.,Kang, K. N. 한국광학회 1993 한국광학회지 Vol.4 No.3
현상론적인 비 선형 이득 포화 효과가 연속 파장 가변시 다전극 DBR 레이저의 변조 특성에 미치는 영향을 이론적으로 분석하였다. 수동 부분에 전류 주입의 증가에 따라 FM 효율, 3dB 대역폭, 공명 주파수는 감소하지만, flat FM응답은 증가한다. 비 선형 이득 포화 효과는 FM/IM응답, 3dB 대역폭, 공명 주파수, chirping-to-modulation-power ratio 등 변조 특성에 커다란 영향을 미치지만, 연속 파장 가변에 의한 변조 특성에는 영향을 미치지 않는다. Phenomenological nonlinear gain saturation effect on the modulation characteristics in a multi-electrode DBR laser, when the lasing wavelength changes, continuously is analized theoretically. FM efficiency, 3 dB bandwidth, and resonance frequency decrease with increasing bias current to the passive section, except increasing the flat FM response. It is found that the nonlinear gain saturation effect severely affects the modulation characteristics such as FM/IM response, 3 dB bandwidth, resonance frequency and CPR, but hardly affects the behavior of continuous frequency tuning.
정전기력 방식의 Drop-on Demand 토출을 위한 MEMS 잉크젯헤드 제작
孫尙郁(S. U. Son),金永珉(Y. M. Kim),崔在鎔(J. Y. Choi),李錫漢(S. H. Lee),高漢瑞(H. S. Ko),金容載(Y. J. Kim),邊渡泳(D. Y. Byun) 대한전기학회 2007 전기학회논문지 Vol.56 No.8
This paper presents a novel electrostatic drop-an-demand ejector with a conductive pole inside nozzle. The MEMS fabricated pole-type nozzle shows a significant improvement in the performance and reliability of forming meniscus and generating a micro dripping mode of droplet out of the meniscus. It is verified experimentally that the use of the pole-type nozzle. The liquid is used D2O+SDS+SWNT (5 %wt). The gap between upper electrode and nozzle is about 600 ㎛. Electrostatic drop-on-demand ejection is observed when a DC voltage of 1.5 ㎸ is applied between the control electrode and ground electrode. Droplet diameter is 100 ㎛.
정전기장 유도된 잉크젯 프린터 헤드를 이용한 탄소나노튜브 잉크의 Drop-On-Demand 특성 연구
崔在鎔(J. Y. Choi),金容載(Y. J. Kim),孫尙郁(S. U. Son),金永珉(Y. M. Kim),李錫漢(S. H. Lee),邊渡泳(D. Y. Byun),高漢瑞(H. S. Ho) 대한전기학회 2007 전기학회논문지 Vol.56 No.8
This paper presents the DOD (Drop-On-Demand) characteristic using the electrostatic field induced inkier printing system. In order to achieve the DOD characteristic of electrostatic field induced inkjet printing, applied the bias voltage of 1.4 ㎸ and the pulse voltage of 2.0 ㎸ ~ 2.7 ㎸ using high voltage pulse generator. Electrostatic field induced droplet ejection is directly observed using a high-speed camera and for investigated DOD characteristic, CNT ink used. The electrostatic field induced inkjet head system has DOD characteristic using pulse generator which can be applied pulse voltage. The bias voltage has a good condition which form meniscus and has micro dripping mode for small size micro droplet. Also, the droplet size decreases with increasing the applied pulse voltage. This paper shows DOD characteristic at electrostatic field induced inkjet head system. Therefore, electrostatic DOD inkjet head system will be applied industrial area comparing conventional electrostatic inkjet head system.
온도체와 냉도체 발골육의 관능특성 및 이화학적 성질의 비교
이석(S . Lee),김병철(B . C . Kim) 한국축산학회 1991 한국축산학회지 Vol.33 No.4
The present study was carried out to compare the various parameters of beef muscle of both hot boning (HB) and cold boning(CB). Various sensory quality traits and physico-chemical characteristics of meat were examined after the processing. Forty Holstein male carcasses were randomly selected from the slaughter house in Seoul, and each twenty carcasses were assigned to hot boning and cold boning. Longissimus dorsi(LD) and semitendinosus(ST) muscles of both boning treatments were utilized in this study. The results were obtained as follows ; l. Meat Color in the LD was significantly darker in the HB than in the CB(p$lt;0.01), but no significant difference was found in the ST. 2. In a series of panel tests, the juiciness in the ST was more desirable in the CB than in the HB, and the tenderness and flavor were not significantly different between two treatments. 3. Although no significant differences were found, the cooking loss and the shear force were slightly higher in the CB than in the HB. 4. The water holding capacity in the LD was significantly higher in the HB than in the CB(p$lt;0.01), but no significant difference was found in the ST. 5. The swelling probe in the LD and ST was significantly higher in the HB than in the CB(p$lt;0.01).
이석(S. Lee),전윤석(Y.S. Jeon),김흥민(H.M. Kim),목형수(H.S. Mok),김덕근(D.G. Kim) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
Recently, the demand of motor for industrial, household machinery is increasing. As switching devices and control technology are progressing, so the use of BLDC Motor is increasing But 3- Phase BLDC Motor generally used has pulsating torque and speed variation in commutation, so the range of it's application is limited high speed application is Especially, to solve these problems, it is necessary to increase phase of Motor, so study of Poly-Phase BLDC Motor is progressing. In this paper, we designd 7-Phase BLDC Motor drive system and MSTC(Minimum Switching Time Controller)