• Journal of the Korean earth science society
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• v.18 no.6
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• pp.493-499
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• 1997

Grain size analysis have been made for the carbonate-detrital mixed sediments on the continental shelf off the southeastern coast of Korea. The detrital components are well-sorted with mean grain size between 2-3 phi. The detrital components are thought to be deposited in the beach environment during the glacial times when the sea level was low, representing typical 'relict' sediments. Most of the carbonate components consist of shell fragments, and are deeply weathered. They are also interpreted as the relict components that were deposited in the shallow marine environment. The carbonate fraction are coarser-grained and poorly sorted compared to the detrital component. The carbonate components are thought to have experienced the continuous environmental control of fragmentation and selective size sorting after the deposition.

• Journal of Korea Society of Industrial Information Systems
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• v.5 no.4
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• pp.67-72
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• 2000

A special double drier structure at a plant level is developed to recycle old ascon as well as an economic mixture rate of old with new is analyzed under safety consideration in this thesis. Based upon the experimentations performed throughout this research, 35% of old ascon mixture is found to be the best for flow test, stability, air void, density, and moisture susceptibility. It is also found that mixture does not meet the requirement in indirect tensile test, However, it is concluded that it is not critical at all since the experimental results present that the difference is too small to give any meaningful indication. A good return for the investment of this facility can be obtained if the mixture rate guideline suggested in this research is kept.

• Transactions of the Korean Society of Mechanical Engineers
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• v.16 no.5
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• pp.974-982
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• 1992

The atomizations of CWM slurry and water are done by a wheel atomizer which is designed and manufactured for this experiment. The variables of the experiment are the angle of vane, aspect ratio, particle loading and the mean size of coal particle distribution. The main purposes of the experiment are to know how the angle of vane and aspect ratio of vane influence the size distribution of CWM droplets. The experimental results say there are no appreciable effects on the mean size of CWM droplets from the change of loading of coal prticles in slurry. The mean size of coal particle in slurry, however, influence quite strongly the mean size of CWM droplets. The mean size of CWM droplets is quite strongly affected by the angle of vane. The size distribution of CWM droplets is controllable by the change of aspect ratio.

• Journal of the Korean Society of Food Science and Nutrition
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• v.29 no.3
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• pp.412-419
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• 2000

본 연구는 오징어, 쌀가루 및 탈지콩가루를 혼합하여, 압출성형 공정을 이용하여, 새로운 스낵제품을 만들고자 수행하였다. 실험실용 single-screw extruder를 이용하여 제품의 낮은 전단력과 높은 팽화율을 목적으로 수 차례 실험한 결과, 15.7%의 혼합물수분과 16$0^{\circ}C$의 조리 오도가 비교적 좋은 제품 생산조건으로 나타났다. 이 조건에서 냉동 건조 오징어가루나 아주 곱게 갈은 생 오징어를 다른 재료들과 혼합하여 최종 제품들을 만들었다. 전단력은 두 오징어 첨가제품간에 유의성 있는 차이는 없었으나, 팽화율의 경우는 생 오징어를 첨가하여 만든 제품이 냉동 건조시킨 오징어를 첨가하여 만든 제품에 비해 유의적으로 높았다. 소비자 관능검사 결과 생 오징어로 만든 제품이 냉동 건조시킨 오징어로 만든 제품에 비해 유의적으로 높았다. 소비자 관능검사 결과 생 오징어로 만든 제품이 냉동 건조시킨 오징어로 만든 제품에 비해 외관, 맛, 향, 그리고 전체적 면에서 선호도가 높았다. 결론적으로 본 연구는 단백질이 풍부한 오징어와 탈지 코가루를 쌀가루에 첨가하여 비교적 팽창이 잘된 스낵제품을 생산할 수 있는 조건을 제시하였으며, 이 결과는 차후 제품개발의 기반으로 사용할 수 있을 것이라고 본다.

• Journal of the Korean Electrochemical Society
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• v.4 no.3
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• pp.94-97
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• 2001

Electro-conducting Polypyrrole(PPy) films were Prepared by applying constant current in various electrolytes solutions and their capacitance properties were investigated using cyclic voltammetry. Capacitance values were strongly dependent on the electrolytes solution used in electrochemical polymerization. PPy prepared in PC/AN mixture solution containing 0.5M $LiClO_4$ with small amount water showed 401 F/g and that electrogenerated in $AN/H_2O$ mixture solution containing 0.5M $LiClO_4$ retained $70\%$ of initial capacitance after 2000 cycles.

• Analytical Science and Technology
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• v.8 no.1
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• pp.41-45
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• 1995

To analyze mixed rare earth elements quantitatively a nonlinear fitting method was applied to laser induced fluorescence signals. Mixed flourescence signal of two elements, Sm and Eu were resolved independently and determined the concentration of these two elements simultaneously. It was found that detection limit for each element in the mixture was sub-ppb level which was the same as that of the single element sample. Additionally it was found that lifetimes of Sm and Eu extracted from the nonlinear fitting method is the same as in the single element cases.

• Proceedings of the Korea Society for Industrial Systems Conference
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• 2000.11a
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• pp.471-482
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• 2000

A special double drier structure at a plant level is developed to recycle old ascon as well as an economic mixture rate of old with new is analyzed under safety consideration in this thesis. Based upon the experimentations performed throughout this research, 35% of old ascon mixture is found to be the best for flow test, stability, air void, density, and moisture susceptibility. It is also found that the mixture does not meet the requirement in indirect tensile test, However, it is concluded that it is not critical at all since the experimental results present that the difference is too small to give any meaningful indication. A good return for the investment of this facility can be obtained if the mixture rate guideline suggested in this research is kept.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.9 no.2
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• pp.529-534
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• 2008

This study grasped the problem by examining the consciousness of professors about the e-learning and reached a conclusion as follows. The teaching-learning model of e-learning should be developed. Universities should develop study system modules that can select assortatively by learners according to the e-Learning course and present a new education model of university for the liberal arts course, areas needing an industry-academic cooperation and an lifelong education in university and so on. Also, the one step e-Learning course of four weeks quantities should be administered through developing combination courses that appropriately combine advantages both face-to-face courses and on-line courses to activate the e-Learning.

• Journal of Adhesion and Interface
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• v.9 no.4
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• pp.24-29
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• 2008

Polypropylene-natural fiber composites have been prepared and their rheological properties during mixing and thermal properties were investigated. Two types of natural fibers (cotton fiber and wood fiber) were compared. On increasing fiber contents, the torque values of composites were increased, where the cotton fiber exhibited higher increase in torques. The torque values of composites were higher as the MI of PP decreased. X-ray diffraction and differential scanning calorimetry results showed an increase in the crystallization temperature but a decrease of crystallinity of the PP/natural fiber composites on increasing fiber contents.

• Water for future
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• v.29 no.4
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• pp.177-186
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• 1996

The analytical approach to determine transverse sand bed slope at river bend are based on two phases that the flow is considered as fully developed flow and the bed is fluvial having bed load. All existing methods are theoretically derived from the initiation of motion of the particles at river bed. They assume that the Shields parameter has a constant value of 0.06. In this study, the variability of Shields parameter due to the differences of shape of grain size distribution is considered. Therefore the parameter is not a constant, 0.06, but depends on the shape of the grain size distribution. This result gives good agreement to estimate transverse bed slope with actual field data at river bend.