• Korean Journal of Social Welfare
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• v.64 no.1
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• pp.125-150
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• 2012

This study was developed to evaluate the effectiveness of a multicultural education program for college students. To this end, the program was designed to offer them a series of twenty lectures for three months, 60 hours in total, and a quasi-experimental design was employed to evaluate the difference between pre-test and post-test scores of participants of both experimental group(N=45, Mdiff=.378) and control group(N=47, Mdiff=.036) on their attitudes on cultural diversity. Also, pre-test and follow-up test scores were compared to confirm whether the effect was sustained. The results showed that while the pre-post difference was statistically significant for experimental group participants(t=4.264, p=.000), the difference was not significant for control group students. Furthermore, the effectiveness of the program was sustained among students in the experimental group at a 3-month follow-up test(t=2.466, p=.016). In conclusion, the multicultural education program, in fact, proved to be effective in changing the attitudes of college students in understanding and accepting different cultures in Korean society.

• KSBB Journal
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• v.15 no.3
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• pp.254-261
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• 2000

A bacterial leaching was conducted for pyrite with Thiobacillus ferrooxidans(ATcC 19859) and Thiobacillus KY isolated from acid mine water around Kwangyang area to characterize the surface of substrate as reaction progress at the optimum condition under 9K medium for 3- days. It was found that the surface crystallinity changes referred to hkl plane was observed for 20 days leached by T. ferrooxidans similar changes also observed for 10 days leached pyrite by Thiobacillus KY. Based on he results of SEM-EDS the atomic ratios of Fe, S and Si on the surface were changed to sulfur rich phase but exposed Si ratio decreased from 16.94% to 4.85% during 30days mainly due to reprecipitating of Fe and S as a mixed compound.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.19 no.4
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• pp.819-824
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• 2015

SDN (Software Defined Network) technology, hardware and network control functions should be separated independently of existing switches or routers and data transfer functions and are also refers to a separate network architecture that can develop and run. When planning a network and designed to reflect the network control function by applying the SDN may reflect the resources efficiently. In this study, one people suggest Applications SDN, which offer an absolutely necessary part of a coded program that combines the benefits of the existing IOS (Combined Benefits) applying the model to complete the Controller part through the MPLS IOS. The OpenFlow Controller is a command to the router LER(Label Edge Router), and transmits the packet in accordance with the command to the destination according to the EXP bit. To configure TCP / IP to the IOS through the optimized coding. Using the OpenFlow protocol controller transmits an encapsulation header as defined in the MPLS packet.

• Korean Journal of Food Science and Technology
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• v.36 no.3
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• pp.518-521
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• 2004

Ginseng saponin was isolated from panax ginseng root using high-speed countercurrent chromatography (HSCCC). Preliminary studies were performed to optimize physical properties of two-phase solvent system and operating parameters including rotation speed of column, elution mode of mobile phase, and flow rate. Two-phase solvent system for isolation of ginseng saponins was composed of chloroform, water, and methanol as blending solvent. Chloroform-aqueous methanol (4:6) systems with various concentration of methanol in water were evaluated for retention of stationary phase in column. Retention of stationary phase decreased with increasing flow rate in tail-to-head elution mode using upper phase as mobile phase and head-to-tail elution mode using lower phase as mobile phase. Latter mode produced high retention at flow rate of 5 mL/min. Optimum conditions for isolation of saponin were chloroform/methanol/water (40/39/21) solvent system; mobile phase, of lower organic layer, flow rate, of 5 mL/min, head to tail elution mode, rotation speed, of 800 rpm, and sample injection, of $200{\mu}L$, Recovery yield of ginseng saponin from panax ginseng root extract by HSCCC was 63.6%, and the purity of HSCCC fractions was verified by TLC.

• Ocean and Polar Research
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• v.28 no.1
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• pp.37-43
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• 2006

In this study, bioactive components such as polyohenols, flavonoids and tocopherols were determined in cultured polar microalgae (Fragilariopsis pseudonana, Chaetoceros neogracile, Stellarima microtrias, Porosiara pseudodenticular). Antioxidant activity of methanol extracts of polar microalgae was also investigated. ${\alpha}-Tocopherol$ contents in Fragilariopsis pseudonana were almost two times higher than those of Chaetoceros neogracile in. The antioxidant activity of methanol extracts of Fragilariopsis pseudonana methanol extracts determined by ABTS assay was higher than other algae. Total polyphenol contents of methanol extracts also showed a similar trend as antioxidant activity. The protective activity against oxidative damages induced by glutamate in PC 12 cells was shown in only Chaetoceros neogracile.

• Journal of Nutrition and Health
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• v.36 no.8
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• pp.834-840
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• 2003

To examine the effect of Saengshik on parameters related to hepatoprotective, anthropometric, blood pressure, serum lipid and blood related indices, nonalcoholic fatty liver subjects were treated with two meal portion of Saengshik in the replacement of meals for a period of three months. Weight, Body Mass Index (BMI) and systolic blood pressure were significantly decreased after the treatment. Chronically elevated serum aspartate aminotransferase (AST), gamma-Glutamyl transferase (r-GTP) and Alkaline Phosphatase (ALP) levels showed reduction to the near normal range. Serum total triglyceride level were reduced following the treatment. Whereas, there were no changes of serum total cholesterol with Saengshik consumption. Also, additional study was conducted to investigate the effect of Saengshik supplementation to high cholesterol and fat diet on lipid metabolism in rats. Male Spraque-Dawley rats were administrated hyperlipidemiainducing diet containing 1% cholesterol and 10% lard to induce hyperlipidemia for 4 weeks and were fed on diet containing Saengshik (30%, w/w) for 7 weeks. The feeding of diet containing 30% Shaengshik significantly decreased total cholesterol (TC) contents and total triglyceride. These results demonstrate Saengshik may be beneficial for fatty liver patients in improving their lipid metabolism.

• The Korean Journal of Applied Statistics
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• v.18 no.2
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• pp.253-269
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• 2005

One of the basic assumptions of the regression models is that the parameter vector does not vary across sample observations. If the parameter vector is not constant for all observations in the sample, the statistical model is changed and the usual least squares estimators do not yield unbiased, consistent and efficient estimates. This study investigates the regression model with some or all parameters vary across partitions of the whole sample data when the model permits different response coefficients during unusual time periods. Since the usual test for overall homogeneity of regressions across partitions of the sample data does not explicitly identify the break points between the partitions, the testing the equality between subsets of coefficients in two or more linear regressions is generalized and combined with the test procedure to search the break point. The method is applied to find the possibility and the turning point of the structural change in the long-run unemployment rate in the usual static framework by using the regression model. The relationships between the variables included in the model are reexamined in the dynamic framework by using Vector Autoregression.

• Journal of the Korean Geotechnical Society
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• v.16 no.4
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• pp.95-105
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• 2000

Anisotropy of stiffiness, from extremely small strains to post-failure strains, of isotropically consolidated air-pulviated sands in plane strain compression was studied by using the newly developed instrumentation for small strain measurements. Seven types of sand of the world-wide origins were tested, which have been extensively used for research purposes. Stress-strain relationships for a wide range of strain from about 0.0001% to 10% were obtained with measuring axial and lateral strains locally free from the effects of bedding and membrane penetration errors at the specimen boundaries. It was found that the maximum shear modulus Gmax was irrespective of the angle $\delta$of the $\sigma$1 direction relative to the bedding plane. However, the normalized Gmax was varied with the types of sand. Furthermore, the dependency of the strain and stress level on the stiffness increased as decreased.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.19 no.3
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• pp.391-400
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• 1994

Recently, the development of ATM switch, a backbone system of BISDN, is receiving worldwide study. Because the development of large communication equipments like a switching system need a lot of time and cost, the performance evaluation by menas of simulation is needed for the higher efficiency of development before actual implementation. So, a general and objective input environment is necessary for proper simulation. The main purpose of this paper is to offer a traffic generator which can provide such input environment as a file for computer simulation of ATM switch. To offer diverse input environment of ATM switch, we select parameters, and implement ATM traffic generator with software technology. Basides, a program to verify the propriety of ATM traffic generator in also proposed. It is expected that the proposed ATM traffic generator will offer diverse input environment for computer simulation to evaluate new ATM switching system, not influenced by any system structure.

• KSBB Journal
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• v.4 no.2
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• pp.94-98
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• 1989

In vitro attachment experiments of bacteria to surface of host plant cell were carried out using C14 labeled cells of A. rhizogenes strain A4 and carrot protoplasts isolated from suspension culture of cells. Protoplasts were cocultivated with A. rhizogenes at various times after their isolation. Attachment kinetics showed that adherence of bacteria to protoplasts attained a maximum level within 120mins of co-cultivation. Maximum attachment occured at pH 6.0 and 24-35$^{\circ}C$. Bacterial attachment was observed at botg carrot cells with and without primary cell wall. The inhibition of transformation on the carrot root discs by A. rhizogenes was observed when non-related strain and heat inactivated bacterial strain cells were pretreated.