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Development of a Real-Time Measurement System for Horizontal Soil Strength
조용진,이동훈,박원엽,이규승 한국농업기계학회 2015 바이오시스템공학 Vol.40 No.3
Purpose: Accurate monitoring of soil strength is a key technology applicable to various precision agricultural practices. Soilstrength has been traditionally measured using a cone penetrometer, which is time-consuming and expensive, making itdifficult to obtain the spatial data required for precision agriculture. To improve the current, inefficient method ofmeasuring soil strength, our objective was to develop and evaluate an in-situ system that could measure horizontal soilstrength in real-time, while moving across a soil bin. Methods: Multiple cone-shape penetrometers were horizontallyassembled at the front of a vertical plow blade at intervals of 5 cm. Each penetrometer was directly connected to a load cell,which measured loads of 0–2.54 kN. In order to process the digital signals from every individual transducer concurrently, amicrocontroller was embedded into the measurement system. Wireless data communication was used between a datastorage device and this real-time horizontal soil strength (RHSS) measurement system travelling at 0.5 m/s through anindoor experimental soil bin. The horizontal soil strength index (HSSI) measured by the developed system was comparedwith the cone index (CI) measured by a traditional cone penetrometer. Results: The coefficient of determination betweenthe CI and the HSSI at depths of 5 cm and 10 cm (r2= 0.67 and 0.88, respectively) were relatively less than those measuredbelow 20 cm (r2≥ 0.93). Additionally, the measured HSSIs were typically greater than the CIs for a given numbers ofcompactor operations. For an all-depth regression, the coefficient of determination was 0.94, with a RMSE of 0.23. Conclusions: A HSSI measurement system was evaluated in comparison with the conventional soil strength measurementsystem, CI. Further study is needed, in the form of field tests, on this real-time measurement and control system, whichwould be applied to precision agriculture.
조용진,안상진 충북대학교 건설기술연구소 1982 建設技術論文集 Vol.1 No.1
The stream morphological characteristics of watershed have important influence upon the analysis or runoff. In this study, the, effect of the map scale on the stream morphological characteristics was used on the data taken from 15'(1:50,000) and 7'30$quot;(1:25,000) topographic maps which could cover the whole Miho River basin, This basin are the first tributary of the Geum River, Otherwise, the longitudinal stream bed profile was calculated by Yang's theoretical stream bed profile, equilibrium profile and actual profile. In the result of this investigation the conclusion is that the resultant relationship obtained from different topographic maps in the scale on the same stream system has come upon the same result as the stream morphological characteristics. Therefore, the great amount of time and effort can be saved in studing the stream morphological charecteristics by using the 15' instead of the 7'30$quot; map system excluding the first order streams.
Quantitative Evaluation of Resveratrol Enrichment Induced by UV Stimulus in Harvested Grapes
조용진,김남수,김종태,맹진수,피재호 한국식품과학회 2012 Food Science and Biotechnology Vol.21 No.2
A mathematical model was proposed to quantitatively describe resveratrol induction in harvested grapes. In the model, k1 and k2 were defined, which were the reaction rate constants for induction during direct UV irradiation and for the time-delayed induction after removing UV irradiation, respectively. During storage after UV irradiation, k2 decreased with time, whereas k1remained constant. The portion induced by the direct irradiation effect was much more than that induced by the time-delayed effect. When UV energy of 610.2 mJ/cm2was applied to ‘Gerbong’ grapes with an initial resveratrol content of 1.15 μg/g, their contents were 8.99 and 9.20 μg/g at day 1 and 6 during storage at 0oC, respectively. In the same situation, resveratrol content of 8.99 μg/g improved to 10.56 μg/g during storage at 20oC. This approach which enriched a health-functional compound through the modulation of metabolism after harvest might be a valueadding method for fresh food industry.
Cyclic 활성슬러지 공정을 이용한 돈사폐수의 영양소 제거특성
조용진 한국환경기술인연합회 1999 환경기술인 Vol.153 No.-
본 실험은 준혐기-호기(A/O, anoxic/oxic)순환공정으로서 시간별 주기변화를 통해 영양염류의 제거특성을 비교 검토하였고 이를 토대로 돈사폐수를 고도 처리 할 때 최적 운전주기와 설계인자를 도출하였다. 아울러 돈사폐수의 질소 제거특성을 분석하는 과정에서 폐수의 특성상 질산화 발생이 저해되는 현상을 관찰하였다. 따라서 이것을 규명하기 위해 질산화에 영향을 미치는 인자들을 중심으로 고찰하였다.