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[論文] 多氣筒 4사이클 스파클 點火機關에 가스 交換過程에 關한 豫測
이병해(B. H. Lee),이재철(J. C. Lee),송준호(J. H. Song) 한국자동차공학회 1991 오토저널 Vol.13 No.2
The computer program which predicts the gas exchange process of multi-cylinder 4-Stroke cycle spark-ignition engine, can be great assistance for the design and development of new engine. In this study, the computer program was developed to predict the gas exchange process of multi-cylinder four stroke cycle spark ignition engine including intake and exhaust systems. When gas exchange process is to be calculated, the evaluation of the variation of the thermodynamic properties with time and position in the intake and exchaust systems is required.<br/> For the purpose, the application of the generalized method of characteristics to the gas exchange process is known as one of the method. The simulation model developed was investigated to the analysis of the branch system of multi-cylinder. The models used were the 2-zone expansion model and single zone model for in cylinder calculation and the generalized method of characteristic including area change, friction, heat transfer and entropy gradients for pipe flow calculation.<br/> The empirical constants reduced to least number as possible were determined through the comparison with the experimented indicator diagram of one particular operating condition and these constants were applied to other operating condition. The predicted pressures in cylinder were compared with the experimental results over the wide range of equivalence ratio and ignition timing. The predicted values have shown good agreement with the experimental results. The theremodynamic properties in the intake and exhaust system were predicted over the wide range of equivalence ratio and ignition timing.<br/> The obtained results can be sumarized as follows.<br/> 1. Pressures in the exhaust manifold have a little influence on the equivalence ratio, a great influence on the ignition timing.<br/> 2. Pressures in the inlet manifold are nearly unchanged by the equivalence ratio and the ignition timing.<br/> 3. In this study, the behaviors of the exhaust temperature, gas in the exhaust manifold were ascertained.
0.18um CMOS 공정을 이용한 UHF 대역 RFID 태그 칩 설계
김도희(D. H. Kim),송준호(J. H. Song),조영호(Y. H. Cho),고승오(S. O. Ko),유종근(C. G. Yu) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.10
본 논문에서는 UHF 대역 RFID의 국제표준인 ISO/IEC 18000-6C 표준을 만족하는 태그 칩을 위한 저전력 고성능 아날로그 회로를 설계 하였다. 설계된 아날로그 회로는 성능 테스트를 위해 메모리 블록을 포함하고 있으며, 태그의 인식률과 경제성을 위해 저전력 및 칩 면적의 최소화에 중점을 두고 설계하였다. 설계된 UHF 대역 RFID 태그용 아날로그 회로는 0.24Vpeak의 RF 입력으로 동작이 가능하며, 칩 면적은 552.5㎛ ×338.8㎛로, UHF 대역 RFID 태그칩에 적합한 작은 면적을 갖는다.
오인환,김운걸,송준호,Oh, I.H.,Kim, W.G.,Song, J.H. 한국축산환경학회 2010 축산시설환경학회지 Vol.16 No.2
비닐하우스용 소형 액비살포기를 설계, 제작하였으며, 납작호스용 일체형과 견고한 둥근호스 분리형으로 되어 있다. 살포장치의 구성은 권취기, 유압모터, 유압실린더, 배출장치, 호스, 3점링크히치, 호스고정장치, 프레임 등으로 되어있다. 살포 시스템은 일체형과 분리형으로 나누어진다. 일반적으로 납작호스는 일체형에 사용되고 둥근호스는 분리형에 사용된다. 분리형은 좁은 공간에서 선회 등을 할 때 작업의 활동성을 개선할 수 있다. 액비살포기를 사용함으로써 작업효율을 5배 정도 높일 수 있었으며, 인력소요는 1/3로 감소되었다. 원하는 살포량에 따른 작업속도를 맞추어주면 면적당 목표 살포량을 얻을 수 있다. 관리자에 대한 작업환경이 개선되었다. It is investigated the development of swine liquid manure spreading system for a polyethylene film (PE vinyl) based greenhouse used for planting vegetables. These types of vinylhouses are normally six to eight meters wide; the spread system must be contained and capable of operating within this area. The system we designed for use here consisted of the following parts: 1) a reel for loading the hose, 2) hydraulic motor and cylinder to generate hydraulic pressure, 3) discharge unit, and 4) a frame with a 3-point hiteh link to the tractor. With this system, there are two types of hoses that can be used, a flexible flat hose that can be mounted directly to a tractor or a solid firm round hose which usually separated from the tractor. In either case, the discharge unit remains on the tractor. It is found that by using our spread system overall efficiency was 5 times greater than spreading swine liquid manure manually.
오인환,장철환,김운걸,송준호,Oh, I.H.,Jang, C.H.,Kim, W.K.,Song, J.H. 한국축산환경학회 2010 축산시설환경학회지 Vol.16 No.2
A major problem within the agricultural/farming community concerns the enormous amount of manure produced by livestock; one possible solution to this problem is to use the animal slurry as a liquid fertilizer. While there are several areas where this fertilizer could be used, one promising area of application is within chestnut tree fields. However, since most of these fields are located on slopes of varying grades and not on flat land, a different spread system is required. Generally, chemical fertilizer is spread in the chestnut field manually by hand; not only does this require a great deal of manpower it is also very difficult and hard work. In our lab experiment, we investigated the relationship between the amount of fertilizer spread and the length of pipe used at varying pressure levels. The hose in our system utilized PVC piping with evenly spaced holes for the fertilizer to dissipate. We initially found that the amount of spread was greatly reduced by reducing pipe pressure. While the difference of the amount of spread during fertilizing was not great, we did find that the reduction of the spread could be correlated to the frictional resistance of the inner lining of the pipe. Based on this, we hypothesized that an increase in pipe pressure would yield a consistent spread. Additionally, a similar outcome could be obtained by regulating the distance of the holes in the pipe and their diameter.