• Journal of Nutrition and Health
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• 제18권3호
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• pp.189-193
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• 1985

Qualitative and quantitative analysis for carbonyl compounds contained in the five kinds of filtrated myulchichuts have been made using HPLC. Carbonyl compounds were separated by converting them into 2,4-dinitrophenylhydrazine derivatives which, in turn extracting with hexane. The extract was dehydrated, filtered and examined on HPLC with $C_{18}column$. The quantitative determination of carbonyl species was achieved using standard calibration technique. Highly reproduceable results were obtained by this methods and the amounts of 2,4-dinitrophenylhydrazine derivatives were highly correlative to peak heights. As the results, we find that the seven kinds of carbonyl compounds are contained in each of myulchichuts examined in this study. Five of which are identified as pyruvic acid, formaldehyde, acetaldehyde, acetone and butanone. But the amounts of carbonyl compounds vary widely with the kinds of the filtrated myulchichuts.

• Journal of Nutrition and Health
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• 제11권1호
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• pp.17-20
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• 1978

The materials carcinogenic agent, nitrosoamine, is distributed in food circumstances, and is formed when both nitrite and secondary amine are present. Nitrites are added to fishes as a color fixative or preservative and secondary amines exist in fishes. In order to find the distribution and contents of secondary amines, analysis of 19 kinds of fish was conducted. The results showed that, significant differences were not observed in the quantity of secondary amines in 19 kinds of fish by district. The highest value was 20.29 ppm in Theragra chalocogramma and the lowest was 0.022 ppm in Ostrea denselamellosa. Six fishes below 1 ppm were Nibea imbricata, Misgurnus mizolepis, Astroconger myriaster, Evynnis Japonica, Ostrea denselamellosa and Solen gouldi. Dimethyl amine only was identified and diethylamine or diphenylamine was not detected in all kinds of 19 fishes.

• Industrial Engineering and Management Systems
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• 제3권2호
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• pp.123-128
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• 2004

A tree structure model has been proposed for representing the unequal-area facility layout. Each facility has a different rectangular shape specified by its area and aspect ratio. In this layout problem, based on the assumption that the shop floor has enough space for laying out the facilities, no constraint is considered for a shop floor. Objectives are minimizing total part movement between facilities and total rectangular layout area where all facilities and dead spaces are enclosed. Using the genetic code corresponding to two kinds of information, facility sequence and branching positions in the tree structure model, a genetic algorithm has been applied for finding non-dominated solutions in the two-objective layout problem. We use three kinds of crossover (PMX, OX, CX) for the former part of the chromosome and one-point crossover for the latter part. Two kinds of layout problems have been tested by the proposed method. The results demonstrate that the presented algorithm is able to find good solutions in enough short time.

• 전기학회논문지
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• 제65권11호
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• pp.1840-1847
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• 2016

The surface of nanosilica and microsilica was modified in order to develop a high voltage insulation material for outdoor application. The modified silicas were well dispersed in an aliphatic cyclic epoxy resin. Dielectric properties were studied for 8 kinds of specimens: 1 kind of neat epoxy, 3 kinds of epoxy/microsilica composites, and 4 kinds of epoxy/microsilica/nanosilica composites. Complex dielectric constants were measured in the range of 10-2~1.2 Hz at room temperature.

• International Journal of Precision Engineering and Manufacturing
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• 제1권1호
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• pp.33-41
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• 2000

Fiber reinforced metal laminates(FRMLs) were new type of hybrid materials. FRMLs consist of high strength metals(Al 5052-H34) and laminated fiber with structural adhesive bond. The effect of resin mixture ratios on the fatigue crack propagation behavior and mechanical properties of aramid fiber reinforced aluminum composites was investigated. The epoxy, diglycidylether of bisphenol A(DGEBA), was cured with methylene dianiline(MDA) with or without an accelerator(K-54). Eight kinds of resin mixture ratio were used for the experiment ; five kinds of FRMLs(1)(mixture of epoxy and curing agent) and three kinds of FRMLs(2)mixture of epoxy, curing agent and accelerator). The characteristic of fatigue crack propagation behavior and mechanical properties FRMLs(2) shows more effecting than that of FRMLs(1).

• 한국식품과학회지
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• 제14권2호
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• pp.106-111
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• 1982

대두 7품종과 이를 이면교잡(二面交雜)해서 얻은 2대 21종의 대두에서 각각 가용성 단백질을 추출하여 Sephadex G-75에 의한 겔 여과와 polyacrylamide 겔 전기영동으로 트립신 인히비터를 분획 정제한 결과 16종의 트립신 인히비터가 검출되었고 각종류의 대두마다 $5{\sim}12$종의 트립신 인히비터가 존재하였으며 주로 5종의 트립신 인히비터가 분포하였다.

• 한국컴퓨터산업학회논문지
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• 제8권4호
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• pp.221-228
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• 2007

Many kinds of microcontrollers such as 8051, PIC16 and Atmega series are used for the automatic control system, home appliances and communication equipments manufacturing. It is very important to understand the basic operational principles of microcontrollers and their design concepts. There are many kinds of educational microcontroller trainers and also they are designed and assembled very complicatedly. For the students or developers, it is very difficult to catch the basic operation schemes and apply the techniques to the control system. And also it requires much cost and time for the various kinds of trainers purchasing. In this paper, standardization of pins layout and peripheral modules for the general microcontroller usage was introduced and tested with 89C2051, 89C51, PIC16F84, PIC16F877, Atmega8535 and Atmega128, etc. As a result of test, it was found that saving the cost and time using this suggested device was possible. And also it was very effective way to understand microcontroller design and programming techniques.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1996년도 한국자동제어학술회의논문집(국내학술편); 포항공과대학교, 포항; 24-26 Oct. 1996
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• pp.864-866
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• 1996

The attitude error is expressed using four kinds of quaternion errors. And the explicit relation equations between them are derived four kinds of nonlinear error models of SDINS using the their explicit relation are also proposed for a nonlinear filter which may be available for a system in the presence of a large attitude error the concept of the proposed nonlinear error model is applied to the velocity aided SDINS using a linear Kalman filter and an extended Kalman filter the simulation results reveal a improvement of performance using the nonlinear error model.

• 대한화학회지
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• 제4권1호
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• pp.88-92
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• 1957

With the intention to examine the Korean bean "Meju" and wine "Kokja" fundamentally we accomplished first the examination of Aspergillus Oryzae in them as follow; 1. 22 kinds of Aspergillus Oryzae were isolated from Korean bean "Meju" and wine "Kokja" 2. Microscopic and physiologic characteristics were surveyed. 3. 5 kinds of powerful moulds in amylolysation and 4 kinds of powerful moulds in proteolysation were found. 4. The moulds isolated from the bean "Meju" were superior to "Kokja's" coulds in amylolytic power and proteolytic power.

• 약학회지
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• 제3권1호
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• pp.51-55
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• 1957

It has been suggested that the fluorine content of crude sea salt may have special value in the prevention of tooth decay, by A.E.Schaefer and J/H/.Shaw. Shaw calculated that if crude sea salt containing about 40 ppm of fluorine were used, the consumption of 26-44 grams of the salt per day for each prison would be sufficient for the prevention of tooth decay. He also suggested that this level of salt consumption is actually quite common among many population in the far and near east. In order to examine the fluorine contents of sea salt in Korea, several kinds of solar-evaporating salt and pan-evaporating salt were studied. The experimental results may be summarized as follows; 1. Fluorine contents of 9 kinds of solar-evaporating salt ranged from 3.8 to 15.0 ppm and the average was 7.52 $\pm$ 3.89 ppm. 2. Fluorine contents of 7 kinds of pan-evaporating salt ranged from 2.5 to 7.1 ppm. 3. The more the salt is refined, the less becomes the fluorine content. 4. Even the crudest sea salt can not contain about 40 ppm of fluorine. 5. Statistically, daily consumption of sea slat for each person in Korea is 28 grams.