Zea Mays L. 의 特殊成分과 澱粉의 X線 回析度

李容億,曺貞淳,申東旿 明知大學校 自然科學硏究所 1984 자연과학논문집 Vol.2 No.-

韓國産 메옥수수, 찰옥수수, 爆裂種에 대한 一般成分,無機質을 定量分析하고 또 胚芽油脂를 油出定量하고 그油脂의 物理,化學的 性質을 判斷하였다. 한편 各各의 녹말은 生 및 糊化시켜서 그의 X-線 회절도를 作成 比較 檢討하였다. 1.一般成分은 各各 Table 1에 表示한 바와 같다. 2.無機質成分은 各各 Table Ⅲ에 表示한 바와 같다. 3. 油脂의 物理化學的 性質 가.油脂의 色度差는 Table V에 表示한 바와 같다. 나.其他 粗脂肪, 比重, 굴절율, 요오드값, 산값, 검화값, 과산화물값, 불검화물값등은 Table Ⅳ에 表示한 바와 같다. 다.녹말에 대한 X-線 회절도의 試驗結果는 Table Ⅶ에 表示된 바와 같이 各 種間의 差異가 없었다. The general constituents and the mineral contents of White Dent Corn, Waxy Corn and Corn, all harvested in Korea, were first examined, and then the quality of each corn was examined through the test for the Physiochemical property of fat extracted from the germ of each corn. The result of qualitative comparison of starch, made by means of X-Ray Powder diffraction for the raw and the boiled starch of each corn, especially to find out any differences among the White Dent, the Waxy and the Pop Corn based on the point of starch, has reached the following conclusions; (1) The general consitutents and each content of the White Dent Corn are ; protein 10.3%, fiber 1.89%, Carbohydrate 69.93%, starch 64.5%, fat 5.36% and ash 1.65%. From it, it could be pointe out tthat the White Dent Corn contained more protein and ash than the others. Compared with the others, th Waxy Corn contained more Carbohydrate , showing its constitutents and contents as follows; protein 9.74f%, fiber 2.08%, Carbohydrate 71.04%, starch 65.5% fat 4.87% and ash 1.64%. As to the Pop Corn, however, it showed a relatively higher content of fat than the rest. Its constituents and each content were as follows ;protin 9.67%, fiber 2.19%, Carbohy-drate 69.39%, starch 64.0%, fat 6.62% and ash 1.64%. (2)Mineral Constituents; Regarding the mineral constiruents contained by the three kinds of corn which were sampled here for this study, the following results were noted; In case of the White Dent Corn, the content of P and Si were high, but the contents of Al and Zn were low. As for the Waxy Corn, the contents of Cu and Si were found less but the content of Al was found a little . Regarding the Pop Corn, however, the contents of its mineral constituents were higher in every respect than the other kinds of corn. Among them, especially , the contents of Si, Cu, Al, and Zn were a little higher. (3)Physiochemical Quality of Fat: The fat sampled here for the test was good enough with the one extracted through the method of pressure, oil pressing method, without any special refining process of high level.It was noted that the specific gravity of fat was 0.911 in the White Dent Corn, and 0.909 in the Pop Corn, which showed approximately 0.003 lower than the standard value specified b6 the Ministry of Health and Social Affairs. In the Waxy Corn, however, its value was almost as much as the specified level. As to the ditribution status of fat constituent, the Pop Corn contained the largest portion of all, showing that the Pop Corn 6.62%, the White Dent Corn 5.36% and the Waxy Corn 4.87% respectively. The iodine value of the sampled fat was 126 in the Waxy Corn, which belonged to the highest one of three kinds of Corn. And acid value of all the corn was generally a little higher than the standard required by the Ministry of Health and Social Affairs, since the fat was extracted from germ by means of ether and then was dried in the temperature of 90℃. In this case it was also noted that the Waxy Corn contained as much as the standard level. The White Dent Corn and the Pop Corn, however, wasd not up to the standard value. (4) Result of test for Starch X-Ray Power Diffraction: Starch, as its crystalline structure differs according to its kind, can be classified into three patterns such as A, B, and C. The raw starch (β-starch) sampled here belonged to A pattern and all the bolied starch (α-starch) to B pattern. When all the above were compared, all the sampled corn, White Dent, Waxy and Pop, did not show much difference in themselves.

기능성 Zeolite-KCIO₃ 복합체에 의한 Chlorothalonil의 분해

최충렬,박만,이동훈,이병묵,이인구,최정,김장억 한국환경농학회 2004 한국환경농학회지 Vol.23 No.2

Salt occlusion in zeolite is a unique phenomenon that takes place only when the salt size is similar to the window size of host zeolite. KClO₃-occluded zeolite, as an environment-friendly oxidant, has a high potential for effective removal of various organic pollutants. This study was carried to investigate the characteristics and the removal kinetics of fungicide chlorothalonil by zeolite-KClO₃ complex. About 10% of KClO₃ was occluded in zeolite pores synthesized by salt-thermal method from fly ash, although the occlusion amount was relatively less compared to that of nitrate salts. By occlusion with KClO₃, no remarkable changes were found in X-ray diffraction patterns of cancrinite, whereas some decrease of overall peak intensities was found with those of sodalite. Different releasing kinetics of ClO^(-)₃ ion were observed in distilled water and soil solution from zeolite-KClO₃ complex. Two reactions, hydration and diffusion, seem to be related with the release of KClO₃. Therefore, the release isotherm of ClO^(-)₃ ion well fitted to the power function model which indicate the release was made by hydration and diffusion. The removal of chlorothalonil by zeolite and KClO₃ reached at reaction equilibrium within 6 hours by 18% and 47%, respectively. However, the chlorothalonil removal by the zeolite-KClO₃ complex increased slowly and steadily up to 92% in 96 hours. These findings suggested that zeolite-KClO₃ complex could be applied for effective removal of organic contaminants in the soil and aqueous environment.

Power Flow Study of Low-Voltage DC Micro-Grid and Control of Energy Storage System in the Grid

Dong-Eok Kim 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.2

DC distribution has several differences compared to AC distribution. DC distribution has a higher efficiency than AC distribution when distributing electricity at the same voltage level. Accordingly, power can be transferred further with low-voltage DC. In addition, power flow in a DC grid system is produced by only a voltage difference in magnitude. Owing to these differences, operation of a DC grid system significantly differs from that of an AC system. In this paper, the power flow problem in a bipolar-type DC grid with unbalanced load conditions is organized and solved. Control strategy of energy storage system on a slow time scale with power references obtained by solving an optimization problem regarding the DC grid is then proposed. The proposed strategy is verified with computer simulations.

Restoration of Distribution System with Distributed Energy Resources using Level-based Candidate Search

Dong-Eok Kim,Namhun Cho 대한전기학회 2018 Journal of Electrical Engineering & Technology Vol.13 No.2

In this paper, we propose a method to search candidates of network reconfiguration to restore distribution system with distributed energy resources using a level-based tree search algorithm. First, we introduce a method of expressing distribution network with distributed energy resources for fault restoration, and to represent the distribution network into a simplified graph. Second, we explain the tree search algorithm, and introduce a method of performing the tree search on the basis of search levels, which we call a level-based tree search in this paper. Then, we propose a candidate search method for fault restoration, and explain it using an example. Finally, we verify the proposed method using computer simulations.

Fault Analysis Method for Power Distribution Grid with PCS-based Distributed Energy Resources

Dong-Eok Kim,Namhun Cho 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.2

In this study, we propose a fault analysis method for a power distribution grid with PCSbased DERs. We first explain the characteristics of a PCS-based DER. According to the characteristics, the DER is considered as a current-controlled voltage source, which produces varying voltages within a certain limit so that currents equal to given references flowing from the DER to the grid (currents controlled). So, we introduce the symmetrical equivalent models in the form of varying voltage source for fault analysis and then, construct a convex optimization problem to solve the fault problem associated with the equivalent models and grid conditions. Thus, the proposed method enables to perform a proper fault analysis considering the characteristics of the DER, which are currents controlled, voltage limited, and unity power factor achievement. To verify the validity of the proposed method, we perform computer simulations with the proposed method and with MATLAB Simulink, and the results are compared.

A Study of the Relationship between Parental Alcohol Problems and Alcohol Use among Adolescent Females in Republic of Korea

Dong-Eok Shin,Jorge Delva 대한예방의학회 2004 예방의학회지 Vol.37 No.3

Measurement of Water Stress for Cucumber Seedlings using Infrared Thermography

( Dong-eok Kim ),( Kwang-soo Bae ),( Youn-ah Shin ),( Shin-hee Han ),( Dong-hyeon Kang ),( Young-hoe Woo ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1

The purpose of this study was to evaluate the moisture stress of cucumber seedlings by measuring the leaf temperature of cucumber seedlings using a thermal imaging camera. The change of leaf temperature of cucumber seedlings by the soil water content was continuously observed. Water stress of cucumber seedlings was estimated by the difference between leaf temperature and temperature. The leaf temperature of cucumber seedlings were measured using the thermal image camera. Leaf temperature of cucumber seedlings was changed continually with time. Leaf temperature of cucumber seedlings was lower at high soil water content. In the case of lack of soil water content, it was found that the leaf temperature was higher than the air temperature and it means that cucumber seedlings is under water stress. There were significant differences in the leaf temperature of stressed plants and non-stressed plants.

Research Articles : Development of a Vacuum Nozzle Seeder for Large Seeds in Cucurbitaceae

( Dong Eok Kim ),( Yu Seob Chang ),( Jong Ku Kim ),( Hyeon Hwan Kim ),( Dong Hyeon Lee ) 한국농업기계학회 2004 Agricultural and Biosystems Engineering Vol.5 No.2

Development of an automatic weighing and feeding system for packing of fresh-cut fruits

( Dong-eok Kim ),( Jeong-gyun Kang ),( Soon-jung Hong ),( Dong-hyeon Kang ) 한국농업기계학회 2021 농업기계공학 Vol.1 No.1

The demand of fresh cut fruits such as fruit cups, fruit salad boxes is increasing recently. But we have not automated feeding machine in the automatic packing system for fresh cut fruits. This study was aimed to develop an automatic weighing and feeding system for packing of fresh-cut fruits on fruit processing plant. A prototype system has been developed and tested for feeding height of fresh-cut fruits, conveying speed, packaging weight, and performance of system. We measured the weight change of a piece of apple by the drop impact according to the feeding height and conveying speed. The performance of prototype was measured in condition of the conveying speed of 0.10 m/s. The weight of cut fruits filled in container showed a standard deviation of 4.87~6.26 g compared to target weight, and the performance of system was 2,465 EA/hr. The experimental result demonstrates that the impact of freshcut fruits was increased with the feeding height and conveying speed and the effect on the feeding height was greater than the conveyor speed. So, we are need to establish closely the feeding conveyor to the container and we are need to adjust the feeding speed according to the follow-up process such as fruit supplement and removal work according to the metering error, container sealing process and labeling process et al.

Feedback Linearization Control of Three-Phase UPS Inverter Systems

Dong-Eok Kim,Dong-Choon Lee IEEE 2010 IEEE transactions on industrial electronics Vol.57 No.3

<P>In this paper, a feedback linearization technique is proposed to control the output voltage control of three-phase uninterruptible power supply systems. First, a nonlinear model including the output <I>LC</I> filters is derived from the power balance condition between the inverter output terminal and the load side. Then, input-output feedback linearization is applied to the nonlinear model to make it linear. The controller of the linearized model is designed by linear control theory. The tracking control law is obtained with a pole placement technique. It is shown experimentally that the proposed control scheme gives high dynamic responses in response to load variation as well as a zero steady-state error.</P>