• Journal of the Korean Society of Food Culture
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• v.30 no.6
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• pp.825-833
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• 2015

This study was conducted to investigate the effectiveness of a nutrition and exercise education program on weight control and nutrition knowledge. The nutrition-exercise educational period was 12 weeks. The subjects were 160 adult women with an average age of 48.1 years. We investigated general characteristics, diet history, eating habits, and intake frequencies of six food groups by survey. A total of 94 women among the subjects participated in the pre and post nutrition knowledge evaluations and anthropometric data assessment. After the program, body weight, body mass index (BMI), and waist circumference significantly decreased. Further, % of body fat decreased, but not significantly. BMI significantly decreased (p<0.001) from 25.14 to $24.80kg/m^2$, and waist circumference significantly decreased (p<0.001) from 79.72 to 77.63 cm. The nutrition knowledge scores of subjects significantly increased (p<0.001) from 8.01 to 9.03. However, there was little change in employment. These results suggest that the nutrition-exercise education program may improve obesity index and nutrition knowledge. However, it is necessary to develop a specialized weight control program for workers.

• Journal of the Korean Society of Food Science and Nutrition
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• v.24 no.2
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• pp.313-322
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• 1995

This study was conducted to investigate the effect of ginseng on the preservability and quality of Chinese cabbage Kimchi. The effect of ginseng on the growth of Lactobacilli, pH, titratable acidity, amount of juice, sensory quality and fracitonation of cell wall ploysaccharides, and enzyme activities related to softening were examined during fermentation. Ginseng promoted the growth of L. brevis and it didn't influence L. plantarum and L. fermentum. But Leuc. mesenteroides and P. cerevisiae was inhibited a little by adding of ginseng. The quality of ginseng added Kimchi evaluated by nalysis of the pH, acidity, sensory quality, the amount of juice, and overall eating quality during fermentation was better than those of control Kimchi, and 2% ginseng added Kimchi was the best ont the preservability and quality. The activity of β -galactosidase in ginseng added Kimchi was higher than that of control Kimchi. But the activity of polygalacturonase in ginseng added Kimchi was the same as that of control Kimchi. Ginseng added Kimchi showed more desirable softness of tissue. This was the same result as the analysis of pectic substance and hemicellulosic polysaccharides composed of cell wall polysaccharides. The value of L(lightness) of ginseng added Kimchi was highly maintained during the edible period and the yellow color from the ginseng was moved to Kimchi tissue in the ginseng added Kimchi.

• 전기의세계
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• v.31 no.1
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• pp.50-58
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• 1982

As a method for improving the power factor and the waveform of ac line current drawn by ac to dc converters, converters of pulse-width control type with forced commutation circuits have been developed in recent years. However, these converters have rather complex commutation circuits which contain auxiliary thyristors in addition to the main thyristors, and their performance is not satisfactory. This paper proposes a new pulse-width controlled ac to dc converter, and analyses its commutation mechanism and its input and output characteristics. The proposed converter circuit consists of a usual thyristor bridge circuit with series diodes to which reactors and diodes are added. This circuit dose not contain auxiliary thyristors, and in this sense it is simpler than the previous converter circuits of pulse-width control type. Since the main thyristors of the converter can be forcedly turned off several times in a half cycle of source voltage, a pulse-width modulation control is possible in order to improve the current waveform as well as the power factor on ac line side. As to dc output side it is shown that the adjustable range of output voltage is wide and the voltage regulation is good due to a rapid reversal of voltage across the commutating capacitors by LC resonance during commutation period. It is also shown that the regenerative operation of the converter is possible.

• Journal of Environmental Health Sciences
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• v.34 no.4
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• pp.285-291
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• 2008

This study was performed to investigate the effects of Chitosan on the nickel poisoning in rats. In the study, 150 male Sprague-Dawley were used. The experimental groups were divided into four: A (30 mg/L nickel), B (30 mg/L nickel+0.2% Chitin, Chitosan and Dithiocarbamate Chitosan), C (30 mg/L nickel+0.4% Chitin, Chitosan and Dithiocarbamate Chitosan), D (30 mg/L nickel+0.8%Chitin, Chitosan and Dithiocarbamate Chitosan). The results were as flows; 1. The nickel concentration in the livers of the control group (A) was $0.153{\sim}0.186\;mg/kg$ but the nickel concentration in the livers of the experimental decreased during the experimental period (P<0.05). 2. Metallothionenin levels in rat liver were $2.77{\sim}3.25\;ug/g$ wet,wt in control group (A), but were $2.89{\sim}3.51\;ug/g$ wet,wt (B), $2.97{\sim}3.62\;ug/g$ wet,wt (C), $2.68{\sim}3.68\;ug/g$ wet,wt (D). Respectively in the experimental groups. The experimental groups were inclined to increase compare to the control group (P<0.05). In conclusion, this study revealed a preventive effect of Chitin, Chitosan and Dithiocarbamate Chitosan against nickel toxicity.

• Journal of the Korean Institute of Landscape Architecture
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• v.29 no.6
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• pp.82-91
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• 2002

This study was conducted to investigate methods to overcome serious problems in hedge making. The growth response of Enonymus japonica was investigated, using different sizes of nonwoven fabric containers. Changes of shoot length, fresh weight and chlorophyll contents were measured a period of growth in each size of container. The results of this study are as follows; 1) The maximum growth of shoot length in all treatments was observed in May and August. The significant difference was found in the smaller size of container containing a less amount of soil than the control. 2) The soil amount of rhizosphere for the production of a standardized hedge seemed to be over 2,400-3,600㎤ per plant. 3) The depth of containers had a greater influence on growth of shoot length than the width of containers. 4) The fresh weight in 40cm width containers and 30$\times$20cm containers was similar to the control, but the rest of the containers showed significant difference compared with the control. 5) A significant difference of chlorophyll content was found in A, B, C, D and G treatment but I treatment did not show significant difference at the 5% level.

• Journal of Power Electronics
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• v.12 no.6
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• pp.895-903
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• 2012

This paper presents a fast switching direct torque control (FS-DTC) using only a single DC-link current sensor. In FS-DTC, six new active voltage complex space vectors (CSVs) are synthesized by the conventional active voltage space vectors (SVs). The corresponding sectors are rotated in the anticlockwise direction by 30 degrees. A selection table is defined to select the CSVs. Based on the "Different Phase Mode", the output sequence of the selected CSV is optimized. Accordingly, a reconstruction method is proposed to acquire the phase currents. The core of the FS-DTC is that all of the three phase currents can be reliably reconstructed during every two sampling periods, which is the result of the fast switching between different phases. The errors between the reconstructed and actual currents are strictly limited in one sampling period. The FS-DTC has the advantages of the standard DTC scheme such as simple structure, quick torque response and robustness. As can be seen in the analysis, the FS-DTC can be thought of as an equivalent standard DTC scheme with 86.6% of the maximum speed, 173.2% of the torque ripple, and 115% of the response time of the torque. Based on a dSPACE DS1103 controller, the FS-DTC is implemented in an induction machine drive system. The results verify the effectiveness of the FS-DTC.

• The Transactions of the Korea Information Processing Society
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• v.4 no.7
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• pp.1788-1796
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• 1997

In this paper, we propose a new connection admission control(CAC) algorithm for traffic control in ATM network in which traffic estimation is performed based on user-specified parameters at every moment of connection request or connection release by recursive formula which makes real-time calculation possible. And traffic estimation using cell flow measurement is carried out when the number of connectioned calls does not change during a measurement reflection period. Performance analysis of the proposed method is carried out using several aspects for homogeneous and heterogeneous bursty traffic. The results showed that the proposed CAC method revealed better performance, than conventional CAC method for burst model in both utilization and QoS point of view.

• The Transactions of the Korean Institute of Power Electronics
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• v.22 no.6
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• pp.476-483
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• 2017

In this paper, a voltage-based model predictive control (MPC) scheme for a modular multilevel converter is used to reduce switching loss. The proposed method calculates an offset voltage that clamps the switching operation of submodules in which the current greatly flows at every sampling period by using the reference phase voltage and the reference phase current. To use the offset voltage, the proposed method converts the current-based MPC to the voltage-based MPC. The proposed voltage-based MPC then generates a new reference pole voltage that clamps the switching of submodules by applying the calculated offset voltage to the phase voltage. Therefore, the proposed method can reduce the switching loss by stopping the switching operation of submodules in which the current greatly flows. The switching loss reduction effect of the proposed method is verified by comparing its loss data with those of the conventional MPC method.

• Proceedings of the KIEE Conference
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• 2006.07c
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• pp.1444-1445
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• 2006

Carbon nanotubes (CNTs) are grown on TiN-Coated silicon substrates at $700^{\circ}C$ using an ICP-CVD method. Ni catalysts for CNT growth are formed using an RF magnetron sputtering system. Post-treatment using hydrogen ions has been performed in the ICP reactor by varying the treatment period. The characterization using various techniques, such as FESEM, HRTEM, and Raman spectroscopy, show that the physical dimension as well as the crystal quality of CNTs are changed by the post-treatment process. It is also seen that the hydrogen ion-bombardment may change the surface structure of CNTs, which may lead to produce better electron emission properties. The physical reason for all the measured data obtained are discussed to establish the relationship between the structural property and the electron emission characteristic of CNTs.

• Journal of Korean Physical Therapy Science
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• v.9 no.4
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• pp.25-33
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• 2002

The purpose of this study is to investigate the effect of 60%HRmax exercise program on LDL-C, HDL-C. The subject of this study, 16 female university students in Seoul, who are randomly sampled and divided into two groups : experimental group (N=8), and control group (N=8). The following results are obtained this study: First the LDL-C levels of two groups are not significantly different in the training period. The LDL-C level of experimental group decreased in after-exercise(4 week, 8 week) in comparison with before-exercise. Specially it decrease significant after 4 week exercise. And it is no significant difference in control group. Second, the HDL-C levels of two groups are not significantly different before exercise but are significant different after exercise(4 week, 8 week). Although the HDL-C level of the experimental group decrease in after-exercise(4 week, 8 week), but it is not significant decrease. And it is not significant difference in control group.