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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.
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)
이민석(M . S . Rhee),이유인(Y . I . Lee),이석(S . Lee),김성훈(S . H . Kim),정영철(Y . C . Jung),고경철(K . C . Koh),홍기창(K . C . Hong),김병철(B . C . Kim) 한국축산학회 1996 한국축산학회지 Vol.38 No.5
A total of 115 pork carcasses (L = Landrace; Y = Large Yorkshire; D = Duroc; F₁ = Landrxe × Large Yorkshire; F₂ = Duroc × Landrace × Large Yorkshire) in Korea was tested to compare their carcass values and meat quality for the development of high pork quality. Carcass values that were measured included dressing percentage (DP), backfat thickness (BF), loin eye area (LEA) and meat percentage (MP). The following measurements of meat quality were carried out : pH-value at 1hr and 24hrs postmortem, subjective scoring test ; color, firmness, marbling degree, meat color ; L^* , a^* , b^* , chroma and Co¨fo-value, water holding capacity (WHC); filterpaper absorption method and bag drip method. In carcass values, D had lower MP and thicker BF compared to the others and they also had the smallest LEA(p$lt;.05). D and F₂ had significantly higher mailing scores than others but F₁ had the lowest(p$lt;.05). D and Y showed lower L^* and higher WHC. On the contrary, F₂ had lower WHC. In meat quality, D was superior to others in terms of moderate marbling, lower lightness and the lowest drip. In spite of the bad carcass values in D, it could be concluded that D must be utilized in a crossing system for the production of higher quality pork.