• The Journal of Korean Medicine
• /
• v.21 no.4
• /
• pp.47-54
• /
• 2000

Objectives: The purpose of this study was to investigate the antithrombotic effect of Carthamus tinctorius. Methods: SD rats were used to investigate the inhibitive effect of platelet aggregation (in vitro & in vivo), prothrombin time, platelet count. Mice were used to investigate the survival rate after injection of collagen & epinepbrine. Results: 1. The inhibitive effect of platelet aggregation (in vitro & in vivo) were increased significantly in all groups. 2. Prothrombin time was decreased in both groups. 3. Platelet count was decreased significantly in sample A. 4. Survival rate after injection of collagen & epinepbrine was increased in sample B. Conclusion: According to the above results, it is suggested that Carthamus tinctorius has antithrombotic effects.

• Journal of Ocean Engineering and Technology
• /
• v.13 no.2 s.32
• /
• pp.129-137
• /
• 1999

The time of the onset of double-diffusive convection in time-dependent, nonlinear concentration fields is investigated theoretically. The initially quiescent horizontal fluid layer with a uniform temperature gradient experiences a sudden concentration change from below, but its stable thermal stratification affects concentration effects in such way to invoke convective motion. The related stability analysis, including Soret effect, is conducted on the basis of the propagation theory. Under the linear stability theory the concentration penetration depth is used as a length scaling factor, and the similarity transform for the linearized perturbation equations. The newlly obtained stability equations are solved numerically. The resulting critical time to mark the onset of regular cells are obtained as a function of the thermal Rayleigh number, the solute Rayleigh number, and the Soret effect coefficient. For a certain value of the Soret effect coefficient, the stable thermal gradient promote double-diffusive convective motion.

• Journal of IKEEE
• /
• v.16 no.2
• /
• pp.153-158
• /
• 2012

A new diversity combining scheme is proposed for time-of-arrival (TOA) estimation of chirp signal in dense multipath channel. In the multipath channel, the performance of TOA estimation using conventional correlation matrix-based diversity combining scheme is degraded due to the lack of de-correlation effect. To increase the de-correlation effect, the proposed diversity scheme employs interleaving method based on the property of de-chirped signal. As a result, the proposed scheme increases de-correlation effect and also reduces the noise of TOA estimation. Finally, the diversity achieved from the proposed scheme improves TOA estimation performance. The de-correlation effect is analyzed mathematically. The estimation accuracy of the proposed diversity scheme is superior to that of conventional diversity scheme in multipath channel.

• Journal of Convergence for Information Technology
• /
• v.7 no.3
• /
• pp.159-164
• /
• 2017

The purpose of this study is to develop and secure the human resources of SMEs by examining the causal relationship between job characteart-time job experience and career development of youth. In order to achieve the purpose of the study, 10,119 youths in the middle and high schools in Korea who participated in the panel data collection by the Korea Youth Policy Institute were surveyed from May 20 to July 12 in 2013, Panel data were used. The results of the study are as follows. First, it was found that the part-time job experience had a statistically significant effect on the planning, which is a sub-area of career development. Second, the part-time job experience has a statistically significant effect on attitude, a sub-domain of career development. Third, it was found that the part-time job experience had a statistically significant effect on the self knowledge, which is a sub-domain of career development. Fourth, it was shown that the part-time job experience had a statistically significant effect on career behavior, one of the sub-areas of career development. Fifth, it was found that the part-time experience characteristics had a statistically significant effect on the independence of sub-domains of career development. Therefore, since the part-time work of youth has a positive effect on career development, it is expected that the human resources of the future of SMEs will be secured if they create a place for career experience and job experience in connection with middle, high school and SMEs.

• Asian-Australasian Journal of Animal Sciences
• /
• v.26 no.5
• /
• pp.711-715
• /
• 2013

To investigate the effect of restricted grazing time on behavior of Tan sheep on desert steppe, forty 4-months old male Tan sheep with an original body weight (BW) of $15.62{\pm}0.33$ kg were randomly allocated to 4 grazing groups which corresponded to 4 different restricted grazing time treatments of 2 h/d (G2), 4 h/d (G4), 8 h/d (G8) and 12 h/d (G12) access to pasture. The restricted grazing times had a significant impact on intake time, resting time, ruminating time, bite rate and movement. As the grazing time decreased, the proportion of time spent on intake, bite rate and grazing velocity significantly (p<0.05) increased, but resting and ruminating time clearly (p<0.05) decreased. The grazing months mainly depicted effect on intake time and grazing velocity. In conclusion, by varying their foraging behavior, Tan sheep could improve grazing efficiency to adapt well to the time-limited grazing circumstance.

• Journal of Korean Society of Industrial and Systems Engineering
• /
• v.17 no.32
• /
• pp.121-126
• /
• 1994

Setup Time Reduction is an important aspect of the Just-in-Time(JIT) and Zero Inventory(Zl) Concepts since it supports reductions in manufacturing lead times and inventories. It also enables small lot sizes and kanban systems implementation for material flow - achieving major improvements in production floor management. One concept fundamental to the pursuit of JIT production in Japan and other countries is adoption of a setup time reduction. This paper looks at the necessities of setup time reduction and the relations to machine utilization. By using an EOQ model for evaluate the effect of setup time reduction, we get the results that over 75 % reduction in setup time is obtain the desired results in the lot size reduction.

• Food Science and Preservation
• /
• v.4 no.2
• /
• pp.131-137
• /
• 1997

Effect of storage on the tree and quality of early cultivar of Citrus unshiu Marc. produced in Cheju according to harvest time were investigated. Soluble solids, acid content, flesh ratio, firmness and specific cavity of the fruits harvested at 27th of November were 12.0, 1.03%, 79.98%, 0.774kg-force, 0.912, respectively. Soluble solids, total sugar and reducing sugar were increased gradually, but acid content was decreased slightly as delayed in harvest time. Otherwise specific gravity and firmness were not shown in great during harvest time, color index(a/b) was increased sharply till late November and then remained in stationary phase. On these result, we recommend that the harvest time of early cultivar of Citrus unshiu Marc. would be during December because of wilting partly. Fully ripened-fruits harvested late, compared to ordinary harvest time, with cold storage would be kept more quality and freshness of fruits for fresh consumption than the fruits harvested early and stored at room temperature.

• Journal of the Korean Home Economics Association
• /
• v.30 no.4
• /
• pp.261-278
• /
• 1992

The purpose of this study is to compare the time use of urban housewives 1980 and 1990, and to investigate significant variables affect to the time spent, the independent effect of variables to the time use of her them. For this purpose, the data from 261(1980) and 287(1990) were analyzed. The major findings are follows: 1. There was 3-4 hours decreasing for household work in 1980 & 1990, and the significant variables were age, number of children, years of youngest child, education, type of kitchen, and type of heating, but in 1990, number of children and education of housewife. 2. In 1990, the independent effect of variables to household work time are number of children, years of youngest child, and cooking fuel to household work time and income to physiological time.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.16 no.7
• /
• pp.4450-4458
• /
• 2015

The purpose of this study was to examine the influence of the exercise performance of yoga and pilates on the autonomic nervous system in an effort to provide some clinical information on exercise prescription. The subjects were 20 selected college students who majored in P.E. A yoga group and a pilates group were organized with 10 students respectively, the autonomic nervous system of the students was measured before the exercise, immediately after that and 30 minutes after recovery. The findings of the study were as follows: First, there were significant differences in the yoga group's stress index and average pulse according to the main effect of the time and interaction effect between the time and group. Second, there were significant differences in the yoga group's sympathetic nervous system activity and autonomic nerve balance according to all the main effect of the time, interaction effect between the time and group and the main effect of group. Third, there were significant differences in HRV(Heart Rate Variability), parasympathetic nervous system activity, SDNN, and RMSSD according to the main effect of the time, and interaction effect between the time and group and the main effect of group produced no statistically significant differences. In conclusion, yoga seemed to be effective at lowering stress index and average pulse. Specifically, yoga exercise seemed to exert a more positive influence on the decrease of sympathetic nervous system activity and autonomic nerve balance than pilates exercise.

• Restorative Dentistry and Endodontics
• /
• v.37 no.3
• /
• pp.155-159
• /
• 2012

Objectives: To investigate the effect of dentin moisture degree and air-drying time on dentin-bond strength of two different one-step self-etching adhesive systems. Materials and Methods: Twenty-four human third molars were used for microtensile bond strength testing of G-Bond and Clearfil $S^3$ Bond. The dentin surface was either blot-dried or air-dried before applying these adhesive agents. After application of the adhesive agent, three different air drying times were evaluated: 1, 5, and 10 sec. Composite resin was build up to 4 mm thickness and light cured for 40 sec with 2 separate layers. Then the tooth was sectioned and trimmed to measure the microtensile bond strength using a universal testing machine. The measured bond strengths were analyzed with three-way ANOVA and regression analysis was done (p = 0.05). Results: All three factors, materials, dentin wetness and air drying time, showed significant effect on the microtensile bond strength. Clearfil $S^3$ Bond, dry dentin surface and 10 sec air drying time showed higher bond strength. Conclusions: Within the limitation of this experiment, air drying time after the application of the one-step self-etching adhesive agent was the most significant factor affecting the bond strength, followed by the material difference and dentin moisture before applying the adhesive agent.