• Journal of Families and Better Life
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• v.18 no.3 s.47
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• pp.171-187
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• 2000

The purpose of this study is to research high school students' stressful life events, to examine effects of SES, psychological environments, stress coping methods on stress. Data were collected by 965 high school students in Cheon-buk. Data were analyzed with the frequency, percentage, factor analysis, reliability, ANOVA test, Multiple Regression in use of SPSS WIN 7.5 Program. The main results are as follow: 1. High school students; stressful life events are ① comparingㆍinterferenceㆍscolding ② having a bad at their study. ③ educational environments ④ ability ⑤ apearance. Peoples stressed me are ① her(him)self ② friend and ③ teacher. Stress coping behaviors are it's ① speak ill a person. ② listen to the music. ③ sleep. ④ be patient. ⑤ keep still or take breath deeply. 2. SES, Psychological Environments, Stress Coping Methods are related to stress. Especially hopeless in future, parental not affections and parental interference are related to stress highly. Also the stress by sex discrimination are related to gender intimately. 3. Effects of SES, Psychological Environments, Stress Coping Method on high school students' stress are very different. So it must to be differentiated the support on the high school students' stress.

• Korean Journal of Pharmacognosy
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• v.25 no.3
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• pp.278-292
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• 1994

This study was attempted to investigate the effect of Machili Cortex extract(Machilus thunbergii Sieb. et Zucc. ) on digestive system in experimental animals. EtOH and MeOH extracts(E.E. and M.E.) were found to inhibit the charcoal transport rate in the small intestine of mice. E.E. exhibited the inhibition of spontaneous movement(motility) and tension in the ileum and colon strips of rabbit, and these actions were inhibited by action of acetylcholine. E.E. and M.E. given intraduodenaly(i.d.) exhibitied the significant decrease of gastric acid secretion in pylorus-ligated rats. E.E. and M.E. inhibited the formation of some experimental gastric ulcers(pylorus ligation-ulcer i.d., indomethacin-induced ulcer p.o. and aspirin-induced ulcer p.o. ) in rats, which are considered to relate to a protective action. E.E. and M.E. caused remarkable increase of bile excretion, compared with normal-control group, when adminstered through i.d., i.v. and p.o. The antibacterial activity against several intestinal microorganisms and other bacteria in vitro test was observed in the administration of E.E. and M.E.

• Journal of the Korean Vacuum Society
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• v.2 no.4
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• pp.416-423
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• 1993

Hydrogen depth profiling was performed by H(19F, $\alpha$${\gamma}$) nuclear resonance reactin . A cesium sputtering ion sorce and 1.7MV Tandem Van de Graaff accelerator was used for the production of 6.5MeV 19F ion. The ${\gamma}$ rays produced by the reaction were measure dby 3" $\times$3" and 6" $\times$8" Nal detectors . A test measurement was done for hydrogen contaminatin layer of a bare silicon wafer, Si3N4(H) and Zr(O)a-Si/Si for the purpose of verifying the applicability , detection limit and the reliability of the method.ility of the method.

• Microbiology and Biotechnology Letters
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• v.31 no.2
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• pp.135-139
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• 2003

During the screening for inhibitors of melanin biosynthesis from plant extract, Angelica polymorpha MAXIM which showed a high level of inhibition was selected. The inhibiting substances were purified form methanol extract of Angelica polymorpha MAXIM followed by silica gel column chromatography and HPLC. The inhibitors were identified as heraclenin, isosaxalin and heraclenol 3'-Me ether, by spectrescopic methods of ESI-MS, H-NMR, C-NMR, DEPT, HMQC and HMBC. These compounds did not have mushroom tyrosinase inhibitory activity, but showed a highly potent melanin biosynthesis inhibition zone in the plate culture of Streptomyces bikiniensis, a bacterium used as an indicator organism in this work. These compounds did not show any growth inhibition against S. bikiniensis at the same concentration of melanin biosynthesis test.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2000.05a
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• pp.257-262
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• 2000

Recently, though there are many REES(Remote Education Estimation Systems), they have some tied and complete testing method not considering for the student individual specification and characteristic. This paper proposes the education model of the distributed asynchronous communication method which making a test without me and place limits using web estimation system from problem bank database, and attach effective method could improve student achievement, quality of estimation later problem filtering using user profile in order to consider the student individual difference and characteristic that not considered pre-Remote Education Estimation Systems. This is a adaptive DAC method improving the pre-DAC method.

• Journal of the Korean Academy of Clinical Electrophysiology
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• v.9 no.1
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• pp.9-14
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• 2011

Purpose : The purpose of this study is to examine the influence of a core stability exercise program using Swiss Ball on muscle activity, muscle thickness, maximum muscular strength, and pain in the trunk region during a 6-weeks program involving participants who have lower back pain. Methods : A total of 21 males between the ages of 20 and 33 years old were divided into 3 Swiss Ball exercise groups. Group 1 performed isometric exercises, group 2 performed isotonic exercises, and group 3 performed mixed exercises. Measurements were taken prior to starting the exercise program and after completing the program at the 6-week period using ME6000 to measure muscle activity and VAS to measure pain reduction. Comparisons were made using a paired t-test and ANOVA on SPSS 10.0. Results : There was a statistically significant effect in muscle activity for group 1 and group 3. Secondly, there was a statistically significant effect in pain reduction for group 1, group 2, and group 3. Conclusion : We found that isometric exercises performed by group 1 were effective in improving muscle activity and pain reduction.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37 no.8C
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• pp.741-749
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• 2012

Since introduction of smart phone in Korean mobile telecommunication market, mobile internet service market has changed dramatically. Although there have been many heated discussion of pro and cons of recent tremendous growth of mobile traffic, mobile data service market has contributed to re-development of whole telecommunication market. This paper is aimed at empirically test and confirms the occurrence of induced demand resulted from LTE service launching. In conclusion, we suggest the direction of regulation and policy for sustainable development of mobile internet service.

• Child Health Nursing Research
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• v.15 no.4
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• pp.335-342
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• 2009

Purpose: This study, using a pre-post test design of non-equivalence comparative group, was done to determine effects of Kangaroo care (KC) on growth in premature infants and on maternal attachment (MA). Methods: Fifty-three premature infants were assigned to the KC (24) or control group (CG) (29). Data were collected from July 2007 to June 2008. KC was given for 60 min at a time, Monday, Wednesday, and Friday for 10 times. Weight, height, and head circumference (HC) of premature infants were checked before the program started. Following the initial measurement, the program was given and measurements were taken again at the end of the program. For measurement of attachment between mother and infant, data collection was done using structured self-reported questionnaires. Results: KC group had a higher weight (t=2.565, p=.013), height (t=2.182, p=.034) and HC (t=2.468, p=.017) than the CG. Compared to the CG, the KC had significantly higher scores in MA (t=2.026, p=.048). Conclusion: The results of this study suggest that the practice of KC in the nursing environment might actively promote attachment between mother and infant as well as acceleration of growth for premature infants as one of the most efficient nursing intervention.

• Proceedings of the Korean Society of Medical Physics Conference
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• 2002.09a
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• pp.180-182
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• 2002

A Proton Therapy Center was established this year in National Cancer Center, Korea. We chose IBA of Belgium as the vendor of the equipment package. A 230 MeV fixed-energy cyclotron will deliver proton beams into two gantry rooms, one horizontal beam room, and one experimental station. The building for the equipment is currently under design with a special emphasis on radiation shielding. Installation of equipments is expected to begin in September next year starting with the first gantry, and the acceptance test will be performed about a year later. To generate therapeutic radiation fields the wobbling method will be a main treatment mode for the first gantry. A pencil beam scanning system on the other hand will be equipped for the second gantry relying on the availability at the time of installation. The beam scanning with intensity modulation adapted will be a most advanced form in radiation therapy known as IMPT. Some details on the project progress, scope of the system, and design of building are described.

• Korean Journal of Pharmacognosy
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• v.51 no.1
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• pp.36-40
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• 2020

The CHCl₃ fraction of the MeOH extract of Ganoderma gibbosum (Ganodermataceae) exhibited cytotoxic activity on five cancer cell lines (MDA-MB-231, SK-hep1, A549, HCT116, and SNU638). Six highly oxygenated lanostane-type triterpenoids (lanostanoids) were isolated by column chromatography to test cytotoxicity on cancer cells. The five known lanostanoids were identified as gibbosic acids A, B, D, G, and H by comparison of molecular ion peaks with the literature data. The structure of a new lanostanoid, gibbosic acids I, was identified to be 3β,8β,15β,20S-tetrahydroxy-7,12,23-trioxolanost-9(11)-en-26-oic acid on the basis of NMR and MS spectroscopy. The three lanostanoids of gibbosic acids A, H, and I of the six isolates significantly suppressed the growth of cancer cells. In particular, the IC₅₀ of gibbosic acid H was prominently low ranging from 2.64-6.56 μM.