• Asian-Australasian Journal of Animal Sciences
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• v.17 no.11
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• pp.1535-1540
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• 2004

Six dry Holstein cows were used to evaluate the effect of dietary neutral detergent fiber (NDF) concentration and particle size (PS) on chewing activity. Treatments were arranged in a 3$\times$3 factorial design; total mixed rations contained three NDF concentrations (26, 32, 38%) and three PS (1.0, 1.5, 2.0 cm). NDF levels and particle sizes of diets were adjusted by formulating rate and cutting length of alfalfa hay and rice straw. Cows were fed twice daily at 90% of ad libitum feed intake throughout the experiment. Chewing activity was positively associated with NDF concentration, but not significantly affected by PS of diet. Eating time per unit of NDF intake was affected by PS rather than NDF concentration of diet. Time spent ruminating per unit DM or NDF intake increased with increasing NDF concentration of diet, but was not affected by PS. As the PS of diet increased, the eating time per day increased, but the rumination time decreased. In addition, as the number of rumination bolues decreased the rumination duration increased as well as the chews per bolus. The regression equation induced from relationships of NDF concentrations (NDF, %) and particle sizes (PS, cm) of diet on roughage value index (RVI, min of chewing time/kg DMI) was as follows. RVI=-19.672+1.44$\times$NDF+5.196$\times$PS, ($R^{2}$=0.81).

• Journal of the Korean Institute of Telematics and Electronics
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• v.13 no.5
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• pp.17-23
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• 1976

The buildup of fission product, i.e. Xe-135 poisoning, is a prime factor in restarting a nuclear reactor from the shutdown, which was under normal operation in the high flux thermal reactor, It is caused by the high absorption crosssection of Xe-135 to thermal neutrons and its long half life, from which the thermal power is affected. It is then possible to restart a nuclear reactor after the sufficient excess reactivity to override this poisoning must be inserted, or its concentration is decreased sufficiently when its temporary shutdown is required. As ratter of fact, these have an important influence not only on reactor safety but also on economic aspect in operation. Considering these points in this study, the shutdown process was cptimized using the Pontryagin's maximum principle so that the shutdown mirth[d was improved as to restart the reactor to its fulpower at any time, but the xenon concentration did not excess the constrained allowable value during and after shutdown, at the same time all the control actions were completed within minimum time from beginning of the shutdown.

• Journal of Microbiology and Biotechnology
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• v.27 no.4
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• pp.785-790
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• 2017

Two piloquinone derivatives isolated from Streptomyces sp. CNQ-027 were tested for the inhibitory activities of two isoforms of monoamine oxidase (MAO), which catalyzes monoamine neurotransmitters. The piloquinone 4,7-dihydroxy-3-methyl-2-(4-methyl-1-oxopentyl)-6H-dibenzo[b,d]pyran-6-one (1) was found to be a highly potent inhibitor of human MAO-B, with an $IC_{50}$ value of $1.21{\mu}M$; in addition, it was found to be highly effective against MAO-A, with an $IC_{50}$ value of $6.47{\mu}M$. Compound 1 was selective, but not extremely so, for MAO-B compared with MAO-A, with a selectivity index value of 5.35. Compound 1,8-dihydroxy-2-methyl-3-(4-methyl-1-oxopentyl)-9,10-phenanthrenedione (2) was moderately effective for the inhibition of MAO-B ($IC_{50}=14.50{\mu}M$) but not for MAO-A ($IC_{50}$ > $80{\mu}M$). There was no time-dependency in inhibition of MAO-A or -B by compound 1, and the MAO-A and -B activities were almost completely recovered in the dilution experiments with an excess amount of compound 1. Compound 1 showed competitive inhibition for MAO-A and -B, with $K_i$ values of 0.573 and $0.248{\mu}M$, respectively. These results suggest that piloquinones from a microbial source could be potent reversible MAO inhibitors and may be useful lead compounds for developing MAO enzyme inhibitors to treat related disorders, such as depression, Parkinson's disease, and Alzheimer's disease.

• Korean Journal of Construction Engineering and Management
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• v.9 no.4
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• pp.182-192
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• 2008

The purpose of this research is to identify problems and solutions of domestic Life Cycle Cost analysis in BTL(Build-Transfer-Lease), a PFI(Private Finance Initiatives) project. It is expected BTL would be quite effective delivery method for public construction introducing the private's major capital investments and technologies, and obviously LCC analysis is becoming more important factor for success of BTL projects. Nevertheless, there are still some complicated issues in LCC analysis, a technique for selecting the optimal VE(Value Engineering) proposals and estimating OM&R (Operation, Maintenance, & Repair) cost of the buildings, and has been applied limitedly. This research mainly focuses on educational facility, as most frequently delivered by BTL currently, especially with two levels (Alternative LCC and Building LCC) , which is occupied main potion in BTL project. In addition, it identifies four main problems and suggests their solutions through case studies focusing six major factors (WBS, Repair Information, Life Cycle, Time value of money, Repair Information Database, LCC Model) from three projects. Advanced development of this research requires closer partnership between the private / public sectors, and their long term strategies.

• Journal of the Korean Institute of Gas
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• v.3 no.1
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• pp.58-63
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• 1999

Experimental works were carried out to evaluate how the lapse of time affects the performance characteristics and the service life of low pressure LPG regulators for domestic use. Experimental results showed that the operating pressure of safety devices deviated from the opening pressure value and the closing pressure value from just 1 year after service, and the operating pressure of regulators used for 7${\~}$8 years notably deviated from the reference value of the adjusting pressure and the closing pressure. And the material properties of springs and diaphragms deteriorated after 5${\~}$6 years of service. Thus, it is estimated that low pressure LPG regulators have approximately 6 years of service life. However, it is highly recommended that regulators exceeding 5 years of service should be replaced for the safety of consumer and accident prevention even if they are operating normally.

• Korean Journal of Medicinal Crop Science
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• v.18 no.4
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• pp.273-279
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• 2010

The study result survey platycodon cultivation regions of Jinju(2), Sacheon(4), Hapcheon(3), Haman(3), and Sancheong(3) of Gyongnam regarding chemical properties of soil, inorganic nitrogen phosphorus by type of composition is as follows: pH and EC value were highest where platycodon cultivated for under 3 years in soils. Content of O.M equal to or less than 25 mg $kg^{-1}$, the average value for platycodoncultivation in korea. Content of exchangeable calcium in soils were 12, 14 $cmol^+kg^{-1}$ in Hapcheon and Haman regions where platycodon was cultivated for two years which is 2~3 time higher level compared with the average upland soil of korea. Water solution boron confirmed approximated level of 3.0 mg $kg^{-1}$ in all survey regions, and the finding is about five times higher than average upland soil of korea which is 0.5 mg $kg^{-1}$. In the case of nitrogen, a significant difference was found depending on cultivation regions and continuous culture. Content of nitrogen in soils were difference according to cultivation area and continuous culture. The composition ratio according to the type of inorganic phosphorus showed the highest in order of Al-P > Ca-P > Fe-P > Saloid-P in all survey regions except for Hapcheon (five, seven years cultivated soils). The correlation showed high significance between available phosphate and inorganic phosphorus.

• Journal of the East Asian Society of Dietary Life
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• v.6 no.2
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• pp.153-166
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• 1996

This study was carried out to investigate food behaviors of 349 college students (male 233, female 116) in Jeon Buk area by questionnaires. 89.1 percent of the students were living in city and 48.8% of those were residing in their own home or relatives. The average height and weight was 172.9cm, 64.2kg for male and 161.0cm, 50.1kg for female. Drinking and smoking rate of males were 88.0% and 61.8%, respectively. Both of male and female were most preferring the kind of rice and the skipping rate of breakfast was highest. Mean score of interest In eating attitudes was 11.7 in male and 13.2 in female(p＜0.001), and score for regular eating time was highest and that for reducing pungent food intake was lowest. The score of interest in eating attitudes was higher In subjects who exercise regularly(p＜0.001), no drinking(p＜0.05), had a good health status (p＜0.01) and attended a lecture related to food and nutrition(p＜0.001) than others. In the sense of value on eating, male had a meal for the physiological needs and famale had a meal for enjoy(p＜0.05). The score of interest in eating attitudes had a negative correlation with drinking(p＜0.001) and smoking(p＜0.05), and had a positive correlation with health status(p＜0.01), effort for a balance of life(p＜0.001), the sense of value on eating and attending a lecture related to food and nutrition(p＜0.001).

• Korean Journal of Social Welfare
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• v.59 no.3
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• pp.33-58
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• 2007

Capital punishment is a system which is not finished simply as one of interim penalty but does away with one person's existence eternally. It is not only opposite to the existential humanism but also contrary to social welfare's goal like social integration. Therefore, this study tries to find out the issues related to capital punishment and further tries to draw out the rightness of capital punishment abolition by critically reviewing the capital punishment system on the basis of the value and philosophy of correctional welfare. In brief, capital punishment is possible only when we negate the inviolable fundamental right which is called life right, and deny the human life existence which surpasses space and time. As long as we can not deny the macroscopic viewpoint to search out the basis of human behavior in the social system which is called culture and society, capital punishment system is contrary to the philosophy of welfare that total society is responsible for guiding members of society to pursue self realization on the basis of value like social solidarity and human dignity. Also, it is against the objective of correctional welfare to head toward special prevention by positive correction and rehabilitation. Capital punishment system ought to be abolished properly.

• Korean Journal of Medicinal Crop Science
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• v.20 no.1
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• pp.27-35
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• 2012

This study was conducted to investigate changes in composition of ginsenosides and color of processed ginsengs prepared by different steaming-drying times. Processed ginsengs were prepared from white ginseng with skin by 9-time repeated steaming at $96^{\circ}C$ for 3 hours and followed by hot air-drying at $50^{\circ}C$ for 24 hours. As the times of steaming processes increased, lightness (L value) decreased and redness (a value) increased in color of ginseng powders. Crude saponin contents and ginsenosides compositions in processed ginsengs prepared by different steaming-drying times were investigated using the HPLC method, respecively. Crude saponin contents according to increasing steaming-drying times decreased in some degree. In the case of major ginsenosides, the contents of $Rb_1$, $Rb_2$, Rc, Rd, Rf, Re, $RG_1$, Re were decreased with increase in steamimg times, but those of $Rh_1$, $Rg_3$, $Rk_1$ were increased after especially 3 times of steaming processes. Interestingly, in black ginseng were prepared by 9 times steaming processes, the content of ginsenoside $Rg_3$ was 8.20 mg/g, approximately 18 times higher than that (0.46 mg/g) in red ginseng. In addition, the ratio of the protopanaxadiol group and protopanaxatiol group (PD/PT) were increased from 1.9 to 8.4 due to increasing times of steamming process.

• Human Ecology Research
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• v.52 no.1
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• pp.75-85
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• 2014

Family life culture embodies the ways of thinking and behaving among family members in everyday lives. With a noticeable growth of multicultural families since 2000, there has been an inflow of other culture into the existing Korean family life culture. This new phenomenon signals a potential transformation of the family life culture in Korean society. To forecast such changes, we compared the family life culture of Korean-Vietnamese multicultural families (as reported by 104 Korean husbands and their Vietnamese wives) with that of mainstream Korean families (as reported by 108 Korean married men and 92 Korean married women) by comparing family ritual practices and family values. We also sought to identify whether two cultures in Korean-Vietnamese multicultural families harmoniously coexist or clash by examining differences within couples. Results showed that Korean married men and Korean husbands of Vietnamese women were very similar in terms of family ritual practices and family values. Differences emerged between Korean husbands and their Vietnamese wives. Specifically, Korean husbands endorsed more traditional gender role beliefs while their family values were less patriarchal compared to their wives. Results suggest that more flexible gender role beliefs reported by Vietnamese wives may be a source of conflict in Korean-Vietnamese multicultural families. At the same time, it may be a driving force of change in their existing family life culture. It will be worthwhile to pay attention in future research to whether and how patriarchal values and flexible gender role beliefs would continue to coexist or modify each other.