• Journal of dental hygiene science
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• v.16 no.5
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• pp.384-392
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• 2016

The purpose of this study was to investigate life stress and resilience levels, and the relationship between life stress and resilience among dental hygiene students. From July 11, 2016 to July 29, 2016, questionnaires were used to survey dental hygiene students in several areas, after which the data collected from 274 questionnaires were analyzed with IBM SPSS Statistics ver. 21.0 for Windows. The results showed a significant negative correlation between life stress and resilience for dental hygiene students in all factors (p<0.05, p<0.001). This means that higher the resilience, the lower the life stress. Therefore, it is necessary to enhance resilience as a preventive dimension and develop associated program to help dental hygiene students cope with life stress.

• The Korean Journal of Zoology
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• v.32 no.4
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• pp.393-403
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• 1989

Using starch gel electrophoresis of proteins, we examined variation at 24 genetic loci in five species (three general of the Subfamily Danioninae (Class Pisces, Family Cyprinidae) inhabiting In Korea. The average degree of genic variation of the Subfamily Danioninae (A=1.8, P=16.5%, HD=0.043, HG=0.049) was far less than that of the fresh water fishes in general. But the degree of genic variation of A. chinensis (P=32.5 HD=0.100, HG=0.119) was highe, than other fishes and the value of O. biders was the lowest (P=4.2%, HD=0.008, HG=0.008). The average genetic similarities among the populations in each species of A. chinensis, Z. platypus, Z. temmincki MS type, Z. temmincki W type, and O. widens were S=0.902, 0.899, 0.990, 0.914, and 0.992, respectively. The average genetic similarity of A. chinensis to the other species was the lowest value of S=0.235, whereas that between two species of Z. temmincki was the highest of S=0.822. Genetically, Z. plypus is more similiar to O. widens than ho species of the same genus Zacco. Based on estimated divergent time of 5 species of the Subfamily Danioninae (7.6 to 0.9 million years) it is assumed that they are speciated during late Pliocene to middle Pleistocene epoch.

• Korean Journal of Weed Science
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• v.6 no.2
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• pp.102-109
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• 1986

To know the ecological pattern of bulrush (Scirpus juncoides) seeds in dormancy-breaking responses as affected by different ripening processes, storage conditions, germination conditions, and some of known chemicals concerned, the study was conducted. Among other conditions detected, the burial in 2 cm depth paddy soil, $5^{\circ}C$ storage temperature, pre-maturing process (Green color), high concentration of chemicals used, and flooding paddy surfaces were the most efficient conditions for bulrush seeds to break dormancy and germinate, respectively.

• Korean Journal of Applied Biomechanics
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• v.23 no.1
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• pp.25-35
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• 2013

This study examined 24 right-handed amateur baseball players. Twelve who had played baseball for more than 6 years were grouped as skilled players, while 12 who had played for 1-3 years were the unskilled player group. The swing motion was divided into four event phases: stance, backswing, impact, and follow-through. The mean and maximum plantar pressure, center of pressure, and ground reaction force were measured during each event phase. The mean and standard deviations for each variables were calculated and differences were validated with the independent sample t-test. A p-value <0.05 was considered statistically significant. The results were as follows. 1)The ideal stance is a stable, balanced position with more than 65% of weight on the right foot. There was significant difference in mean left plantar pressure, while the maximal plantar pressure and mean right plantar pressure did not differ significant. 2)The effective backswing of a skilled player is comprised a rightward shift in weight to build maximum energy. More than 90% of the weight was on the right foot. There was a significant difference in the mean left plantar pressure, while the maximal plantar pressure and mean right plantar pressure did not differ significantly. 3) For an effective impact, a rapid shift in weight to the left foot is essential, so that a power hit is obtained. Significant difference in the mean and maximum plantar pressures of both feet were observed. 4)Follow-through requires wight balance, more on the right than the left, without leaning leftward. There was no significant difference in the mean or maximum plantar pressure. 5)The center of plantar pressure should move from the center of the foot to the toe. 6)The analyses of the ground reaction force suggest that a good swing involves a gradual shift in weight to the right side and a rapid leftward shift at impact. Good balance, with the center of gravity on the right side at follow-through, is also required.

• Radiation Oncology Journal
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• v.13 no.2
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• pp.113-120
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• 1995

Purpose : To investigate the effect of alkaloid fraction from Korean ginseng on radiation-induced DNA double strand breaks (dsb) formation and repair in murine lymphocytes Materials and Methods : We used the neutral filter elution technique to assay $^{60}Co\;{\gamma}$ ray-induced DNA double strand breaks formation and repair in C57BL/6 mouse spleen lymphocytes for evaluating the dose-response relationship in the presence of alkaloid fraction as a radioprotective agent. The lymphocytes were stimulated with Phytohemagglutinin (PHA, 2 u g/ml) to label $^3[H]-thymidine.$ Isotope-labelled lymphocytes in suspension were exposed to 100 Gy at $0^{\cdot}C$ in the alkaloid fraction-treated group and elution procedure was performed at PH 9.6. The extents of formation of radiation-induced DNA double strand breaks and repair were compared respectively via strand scission factor (SSF) and relative strand scission factor (RSSF). Results: Alkaloid fraction reduced the formation of double strand breaks with dose modification factor of 2 15, compared to control group Rejoining of DNA dsb appeared to take place via two components. The first fast component was completed within 20.4 minutes, but the second slow component was not completed until 220.2 minutes after irradiation. About $30\%$ of dsb formed by irradiation was ultimately unrejoined despite the administration of alkaloid fraction. The administration of alkaloid fraction had a great effect on the second slow component of repair; the half-time of fast component repair was not changed, but that of slow component was 621.8 minutes. Conclusion: Neutral filter elution assay Proved to be a very effective method to quantitate the extents of DNA dsb formation and its repair. By using this technique, we were able to evaluate the efficiency of alkaloid fraction from Korean ginseng as a valuable radioprotector. Alkaloid fraction can be used prophylactically to prevent or ameliorate the severe radiation damages in workers and neighbors around the atomic power plants. For more refined study, however, more advanced purification of alkaloid fraction wil be needed in the near future.

• Korean Journal of Medicinal Crop Science
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• v.5 no.4
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• pp.284-288
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• 1997

In order to study on suitable harvest time of adlay utilizing self-feeding combine harvester with four rows, which is originally designed for rice harvest, harvesting were carried out at four different times (40, 50, 60 and 70 days after anthesis) . For efficient operation, appropriate working rows were 2 rows at 50 days after anthesis and working speed was 0.26m/sec at 60 days after anthesis. Theoretical working capability was 11.23a/hr at 60 days after anthesis. As the harvesting was delayed, water content of adlay decreased. Water content of culm+leaf was $69.7{\sim}55.3%$ and water content of grain was 34.2% at 60 days after anthesis. The later adlay was harvested. the higher the percent of ripened grain was. But the immature grain was decreased. Remnants was less than 1.8% at 60 days after anthesis. The later adlay was harvested, the heavier volume weight was. Yield was the highest at 60 days after anthesis. When utilizing self-feeding combine harvester with four rows, which was originally designed for rice harvest, suitable harvesting time was 60 days after anthesis. Therefore, theoretically suitable harvest time was 68 days after anthesis.

• Korean Journal of Psychosomatic Medicine
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• v.16 no.2
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• pp.120-124
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• 2008

Objectives : The current study aimed at assessing clinical symptoms and personality characteristics on MMPI of patients in Hwa-Byung clinic. Methods : Thirty-one female patients($45.4{\pm}8.4$ years old) who visited to the Hwa-Byung Clinic in Ewha womans Dongdaemoon hospital were recruited. Semistructured interviews and laboratory tests for symptoms were performed for the patients group. Patients group and control group($42.9{\pm}8.0$ years old) completed MMPI. Results : All patients had symptoms of chest tightness or chest pain. 19(61.3%) out of 31 patients had gastrointestinal complaints. There were respiratory symptoms in 13(41.9%) patients. 12 patients(38.7%) suffered from difficulties in their sleep. 12 patients(38.7%) had psychiatric symptoms including anxiety or depressed mood. 8 patients(27.6%) were diagnosed as gastrointestinal diseases by the laboratory test. After controlling age and education, scores of Hs, D, Hy, Pt on MMPI in patients group were significantly higher than control group (p=0.001, p=0.049, p=0.000, and p=0.029, ANCOVA, respectively). Conclusion : In the current study, patients who have visited Hwa-Byung clinic showed various somatic symptoms including chest tightness, gastrointestinal symptoms, complaints in respiratory system and psychiatric symptoms. Based on laboratory tests, considerable proportion of patients was diagnosed as physical illnesses. Additionally, patients in Hwa-Byung clinic have a tendency to be more hypochondriatic, depressed, hysteric and anxious.

• Environmental and Resource Economics Review
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• v.26 no.3
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• pp.417-449
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• 2017

The purpose of this study is to analyze the effect of local area concentration of particulate matter on life satisfaction, by matching subjective satisfaction in the Korea Labor & Income Panel Study data with daily data of $PM_{10}$ and $PM_{2.5}$. We find that the concentration of particulate matter has a significant negative effect on satisfaction. A $1{\mu}g/m^3$ increase in $PM_{10}$($PM_{2.5}$) leads to lower the probability of choosing 'satisfaction' by 0.042%p~0.091%p(0.034%p~0.153%p) and a 1% increase in annual income per household raises the probability of choosing 'satisfaction' by 0.16%p~0.18%p respectively. To estimate the monetary value of reducing $PM_{10}$ and $PM_{2.5}$, we calculate willingness-to-pay for mitigating air pollution, which represents the tradeoff between the reduction in particulate matter and income. We find that people on average are willing to pay \108,787($96)~209,519($186) for a $1{\mu}g/m^3$ reduction in $PM_{10}$ and to pay 89,345($79)~362,930($322) in $PM_{2.5}$. This amount corresponds to 0.26%~0.50%(0.22%~0.88%) of the average annual household income in South Korea.

• Applied Biological Chemistry
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• v.18 no.2
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• pp.65-70
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• 1975

The cultivation of ginseng plant (Panax ginseng C.A. Meyer) in Korea as an eminent medicinal herb may be traced far back in history. However, the practices in cultivation have not much improved in terms of efficiency and scientific farming. In the present study some experiments were undertaken for the search of the soil and nutrition conditions, because of the nutritional requirement of ginseng plant shaws quite unique compared with other crops. In both the seed bed and the field 'Yakto' has been traditionally employed or the prime source of nutrition of the crop. Yakto is a complex matter prepared from raw foliage of the broad-leaved trees as the main portion with the admixture of a variety of organic nitrogen source through fermentative processes. The composition of Yakto may be classified coarsely into the decomposed and undecomposed substances, the former being further fractionated according their solubilities, comprising also various colloidal matters whose composition and structure are yet to be known. The Yakto-fractions were subjected to analyze for search of its nature and coarse composition in terms of the distribution of nitrogen, contents of organic functional groups such as -COOH, phenolic-OH, alcholic-OH and methoxyl and hydrolysable sugars. Furthermore, absorption-spectra of each fraction were determined in visible and infrared region and compared the results each other.

• Journal of Korean Orthopaedic Sports Medicine
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• v.3 no.1
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• pp.25-30
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• 2004

Objective: Recently, inline skates are populary increasing and have become major recreational activities. This study was performed to determine the effective prevention means on various extremity injury by investigating injury severity occording to acute injury and overuse injury. Results: Acute inline skating injury was experienced mostly among the age between 6$\~$14 years old children after school around nearby their home without using no appropriate safety device gear. The wrist injury was mostly happened. We think that overuse injury is related to boot itself, boot fitting and improper skating techniques. Conclusion: So afterall, appropriate safety equipment wearing in inline skating at the safe place after learning about the skating skills can reduce the acute inline skating extremity injuries. Choosing a pair of good fitting boots, performing the exact pushing techniques and take good rests in the middle of skating frequently can reduce the overuse injury.