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施設園藝에 있어서 栽培管理의 自動化 시스템에 關한 硏究 : Dilution and Spray System of Agricultural Chemicals 農藥의 稀釋 및 撒布 自動化
李基明,尹學基,具健孝 慶北大學校 1987 農業科學技術硏究所報 Vol.4 No.-
This study was carried out to develop an automatic diluting and spraying system of agricultural chemicals in a vinylhouse controlled by a micro-computer. Salt was used in this experiment as a tracer to measure the concentration of agricultural chemicals. Two methods measured by an electrical conductivity and a constant flow rate were introduced to control the agricultural chemicals. The results obtained from this study were summarized as follows: 1. In order to control the quantity of dilute solution, water level detecting sensor was used. This sensor was consist of two enamel wire which were installed perpendicular to the water surface and designed to convert from condensor capacity to voltage output. 2. Also, in order to measure the dilute ratio, electrical conductivity sensor was used. This sensor was designed with an aluminum plate as an electrode and to measure the DC voltage which was proportional to electrical conductivity. 3. Two methods, measured by an electrical conductivity and a constant flow rate, were studied to control the dilute ratio. Also, a software was developed for this purpose. According to the result of this study, both methods were turned out to be a good way to control the agricultural chemicals in vinylhouse by a micro-computer.
이동헌,송현직,구건효 한국조명전기설비학회 2001 조명·전기설비학회논문지 Vol.15 No.3
본 논문에서는 방전관을 채용하여 전기적 기체방전의 중침을 이용한 새로운 방전형식의 환경개선용 오존발생 기술을 개발하였다. 방전관형 오존발생기(DLO)는 설치된 3개의 전극중 접지전극인 중심전극으로 방전관을 사용 하였으며, 나머지 2개의 메쉬형 내부전극과 나선형 외부전극에 180[$^{\circ}$]의 위상차를 가진 2개의 교류고전압 전원을 인가함으로써 방전관과 내부전극, 방전관과 외부전극사이의 방전공간에서 각각 발생되는 무성방전의 중침에 의하여 오존이 발생되는 구조이다. 이때, 원료가스의 유량, 방전전력 및 DLO의 사용 개수 변화에 따른 방전특성과 오존생성특성을 연구검토하였으며, DLO로부터 생성된 오존을 대기오염물질인 NO 가스에 접촉시켰을 때 NO 제거특성이 우수하여 방전관형 오존발생기가 대기환경개선 설비로 적용가능함을 확인하였다. In this paper, discharge lamp ozonizer(DLO) of a new discharge type using superposition of gaseous electrical discharge for environment improvement was designed and manufactured. DLO is equipped with 3 electrodes(central ground electrode of discharge lamp type internal high voltage electrode of mesh type and external high voltage electrode of spiral type), and it is composed of double gap(gap between discharge lamp and internal electrode, gap between discharge lamp and external electrode). Internal and external electrodes are respectively applied AC high voltage which has 180[$^{\circ}$] phase difference. Ozone is generated by overlaying of each silent discharge which is respectively came from two gaps. At the moment discharge characteristics and ozone generation characteristics of DLO were investigated in accordance with quantity of supplied gas, discharge power and the number of DLO. When ozone generated by DLO was in contact with NO gas, removal characteristics was excellent, so it confirmed that DLO could be used as air environment improvement facility.
李基明,章益柱,宋在琯,具健孝 경북대학교 1992 새마을 硏究論叢 Vol.13 No.-
This study was performed to develop a dynamometer for measuring simultaneously draft and PTO power by connecting a driving implement at the three-point hitch of the tractor. The structure of the device consists of two octagonal rings which are, based on the principle of abserption dynamometer, mounted between tractor frame and implement frame. A series of test were performed to improve the dynamometer and following results were obtained. 1. In a static performance test the mean and maximum errors in measuring the draft were 1.5% and 2.4%, respectively. In measuring torque mean and maximum errors were 2.1% and 3.1%, respectivly. Accordingly, it can be mentioned that the device developed is very accurate and satisfactory for these kinds of experiments. 2. From the field test of the dynamomenter mounted to the tractor, the draft forces could be measured very accurately. The only problem is that the deviice is affected by external forces such as an obstructor in the PTO power test. In this case, however, the effect was only confined to the instant data not to the average data. Because of its elastic characteristics, it returned to its original position. As the results of this experiment, a dynamometer which can offset the external forces in the PTO power test is necessary to be developed as a future research subject.