• The Korean Journal of Financial Management
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• v.17 no.2
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• pp.125-141
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• 2000

이 논문에서는 비선형 마코브과정에 의하여 주가가 생성되며 비선형 마코브과정간에 공시운동이 존재하고 이 공시운동에 의하여 주가가 생성되고 있는지의 여부를 검토하는데 목적이 있다. 공시운동은 벡터시계열을 구성하고 있는 단일시계열들의 작용에 의하여 형성되는 관계이다. 종합주가지수를 비롯한 산업별 주가지수가 모두 41개인데 이 지수들의 수익률 시계열들이 비선형 마코브과정을 데이터 생성함수로하여 생성된다고 할 때 정상성 어고딕성이 성립하고 있는 지수수익률시계열이 있고 그렇지 않은 시계열도 있다. 종합주가지수와 대기업, 소기업은 정상적 어고딕 비선형 마코브과정을 따르고 있다. 비선형 마코브과정의 공시운동은 두 시계열간의 관계이다. 종합주가지수의 수익률 시계열과 각 산업주가지수의 수익률시계열간의 공시운동은 시장 1부, 시장 2부 등을 비롯한 산업에서는 존재하고 있지 않으며, 중기업 산업 등을 비롯한 산업에서는 존재하고 있다.

• Journal of Dairy Science and Biotechnology
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• v.33 no.1
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• pp.75-82
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• 2015

Chitosan provides beneficial effects such as decrease in cholesterol, weight loss, and antioxidative effects. The manufacture of Maribo cheese containing powdered chitosan (CP) or nanopowdered chitosan (NCP) is not yet established. Thus, this study was conducted to determine the effect of CP and NCP on Maribo cheese's physicochemical properties. The curd was added with 0.2 and 0.5% of CP and NCP, respectively, after the second whey drainage. The pH changed and the lactic acid bacterial population decreased in all treatments. Additionally, WSN and TBA gradually increased during the ripening of cheese. The TP of control cheese was higher than that of another group. On the basis of the obtained results, consumer preference test on overall acceptability of 0.2% NCP was good-41%, great good 13%. It was concluded that the quality of Maribo cheese was not affected by adding chitosan. Furthermore, 0.2% NCP was preferred during cheese ripening and observed the possibility of functional cheese than another group.

• Journal of the Korean Society of Food Science and Nutrition
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• v.43 no.10
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• pp.1571-1578
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• 2014

This study compared the production of functional Ssukgaen Dduk containing yam, mugwort, glutinous rice and Goami 2 rice, which is rich in dietary fiber and prevents diabetes and adult disease. To enhance the chewiness and softness of Goami Ssukgaen Dduk, the dough was kneaded various times. When Ssukgaen Dduk was made with various amounts of yam and glutinous rice (25:5%, 20:10%, 15:15%, 10:20%, and 5:25%) to Goami 2 rice, the control group (non-glutinous rice Ssukgaen Dduk) showed the highest preference level in sensory test. Of the yam and glutinous rice additives groups, YG4 (10% yam and 20% glutinous rice) showed higher preference. As glutinous rice additives increased and yam additives decreased, preference level significantly increased. Of the yam and glutinous rice groups, G40 kneaded 40 times, showed a significant difference (4.17 compared to control group). G40 also indicated appropriate characteristics in terms of taste, texture, chewiness, softness, and delicacy of texture. G60 and G80 kneaded 60 and 80 times, respectively, showed remarkably lower scores than other samples in terms of general preference. Thus, quality characteristics of Ssukgaen Dduk decreased when amount of kneading increased, hardness significantly decreased. In conclusion, Ssukgaen Dduk should contain 10% yam and 20% glutinous rice added to 70% Goami 2 rice powder mixed with mugwort, kneaded about 40 times.

• Korean journal of food and cookery science
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• v.11 no.4
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• pp.351-355
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• 1995

The inhibitory effects of methanol, ethanol, chloroform/ methanol and water extracts from natural and cultural yams on the mutagenicity in the cooked pork (broiled and panfried) and the chemically induced mutagen, sodium azide, benzo(a)pyrene and 2-aminofluorene were investigated using salmolla typhimurium TA 100. In the presence of the S9 mixture, ethanol extract from natural yam showed high inhibitory effect on the mutagenicity of the cooked pork. But benzo(a)pyrene, supposed to be produced in mutagen during cooking, did not show high inhibitory effect in same extract. Besids, the yam extract on the mutagenicity of the sodium azide without S9 mixture showed low inhibitory effect. However 2-aminoflourene with S9 mixture showed high inhibitory effect, 91.5％.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.28 no.7
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• pp.584-587
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• 2017

In this paper, the radar cross section of the integrated mast module for battleship is analyzed. The computation program based on physical optics and physical theory of diffraction is developed and the computed results are compared with those of commercial simulator to check the accuracy of computations. The radar cross section is calculated in terms of the mast shape, incident angle, and polarization. The radar cross section can be reduced through the change of the mast slope and the chamfered mast, which can be applied to a mast with a low radar cross section.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.16 no.3
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• pp.109-113
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• 2016

In this paper, we propose efficient LED lighting control algorithm using a David star magic square. Such algorithms increases the power reduction, the heat efficiency and LED life cycle and the efficiency of the LED lighting control consumption. Lighting system using existing Magic square algorithm could be reduced to increase the heat efficiency of the LED because the LED lighting time of the reduced cross-lighting. but it has a limit to the lighting control. If should apply the this proposed algorithm, can reduces power consumption and increases LED life-cycle, heat efficiency of LED lighting module and efficiency of the lighting control of the LED. This paper proposed that algorithm is by using a David star magic square on the LED Matrix. Divided into twelve areas to move the pattern in constant time interval, to perform the cross rotation and inversion techniques to thereby light up. In this paper proposed algorithm of this paper was compared with existing Magic square approach. As a result, power consumption and heat-value and luminous flux was reduced as the conventional lighting system. And, the LED lighting control increase the efficiency.

• Journal of the Korean Magnetics Society
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• v.26 no.6
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• pp.190-195
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• 2016

We report the effect of pressure varying from 0 to 1500 bar on the magnetic properties of magnetite nanoparticles synthesized from $Fe(OH)_2$ suspension using a high pressure homogenizer without any dispersing agent and oxidant. The observed X-ray diffraction (XRD) patterns showed that all the synthesized nanoparticles had the inverse spinel structure of magnetite. It was found from transmission electron microscopy (TEM) and XRD analysis that the average size of the synthesized magnetite particles could be controlled by the pressure of the high pressure homogenizer. The average particle size was found to range from 21 to 26 nm and decrease with increasing pressure. Magnetic hysteresis measurements performed at room temperature using a vibrating sample magnetometer (VSM) revealed the appearance of a superparamagnetic behavior in the magnetite nanoparticles synthesized at a pressure of 1500 bar.

• Journal of the Korean Magnetics Society
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• v.16 no.3
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• pp.182-185
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• 2006

In this work, we have constructed 3-axis flux-gate magnetometer for the attitude control of satellite. The constructed magnetometer shows uncertainty of ${\pm}1%$, noise level of $0.2nT/\sqrt{Hz}$ at 1 Hz under 1W power consumption. Environment test for satellite component, acceleration test and thermal cycle test were carried out. For the acceleration test, magnetometer was vibrated frequency ranging from 10 Hz to 1 kHz at 15 g (g : gravitational acceleration at earth), and for thermal cycle test, 4 times of thermal cycle were carried out temperature ranging from $-55^{\circ}C\;to\;+80^{\circ}C$ under vacuum of $1x10^{-6}Torr$.

• Korean Journal of Plant Resources
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• v.15 no.3
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• pp.285-292
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• 2002

This study was carried out to determine agronomic and genetic characteristics of the production process in tropical yams(Dioscorea atata L.). To make clear the possibility of cultivation of tropical yams in the Suwon area, the growth of the aboveground parts and the enlargement of tuber of Dioscorea alata, were investigated. The aboveground parts of the plants whose sprouted mother tuber were planted in late April were grown slowly until the 70-days after planting and grown rapidly after. from about 150-days after plantation, total length of vines slowly decreased due to the burning of the branch vines of lower modes. With regard to the branching progressed to 4th for the solo yam and to 6th for purple yam. The secondary branches tended to grow better. When the formation of daughter tubers was observed at the 50-days after planting, their enlargement was very slow. The rapid growth of tubers began at the 140-days and continued to the 190-days. General components such as protein, fiber, and lipid were higher in D. opposita rather than in D. alata. Hardness of D. alata was 2696.2 while that of D. opposita was 4946.9. Lightness of D. alata was 73.99, being higher than that of D. opposita.

• Journal of the Korean Magnetics Society
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• v.8 no.6
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• pp.388-394
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• 1998

We designed and fabricated an improved null-type torque magnetometer for measuring magnetic anisotropy of magnetic materials. This torque magnetometer has a measurement range of $~{\pm}15$ dyne.cm, and the range can be controlled. Resolution is ~0.0005 dyne.cm. Noise level is less than 0.01 dyne.cm with one measurement, and less than 0.004 dyne.cm with 10 averaged measuremets. The precision is less than 0.5 %. In contrast to typical null-type torque magnetometers, we placed a small ferrite magnet in the Helmholtz coil, instead of placing coil in the permanent magnet. From this novel sturucture, we can design a geometrically isotropic and relatively light-weight sample rod. Also, we can prevent the effect of input and output lines of coil exposed in the magnetic field in torque meter. Consequently, our novel null-type torque magnetometer can have a better sensitivity, faster response time, and smaller distortion of torque curve than commercially available torque magnetometers.