• Economic and Environmental Geology
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• v.1 no.1
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• pp.35-46
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• 1968

Some of geologists in Korea recently postlated that Okchon system previously known to be precambrian age was the metamorphosed sediments of post-Chosen (Ordovician and pre-Kyeongsang (late Jurassic to Cretaceous) periods, or even definitely of Triassic period simply on the basis of the fact that Okcheon system overlies the Great Limestone series of Chosen system of Camber-ordovician age, and of other few assumptions of minor importance. As a result of such correlation, thick series of metasediments and Okcheon system of unknown age were established in this particular region and vaguely correlated to Paleozoic and Mesozoic sediments. Recent study done by the author reveled that: 1) only the upper Okcheon bed of S. Nakamura was true Okcheon system, and the middle and lower Okcheon beds were excluded, because they were correlated to Cambrian and Permian sediments resfectively, 2) Sangnaeri, Seochangri, and rengam formations of unknown age, and Baekhwasan, Jobong, and Ihwaryeong formations of Okcheon system of also unknown age were the metamorphosed Yangdeok system of Cambrian age, all of these formations were differentiated by the previous workers and were equivalent to the middle Okcheon system of S. Nakamure, and. 3) These metamorphosed Yangdeok system overlaid apparently the Great Limestone series in forms of overthrust and klippe which were produced by the orogeny took place during post-Daedong and pre-Kyeongsang period (probably middle to the Jurassic). The Sobaeksan Range, folded mountain Chains was also formed by this orogeny. Thus, Okcheon system newly defined by the author is precambrain age and consists in ascending order of Kemyenogsan, Hyangsan dolomite, and Daehangsan quartzite formation which were previously classified into metasediments of unknown age, and Munjuri, and Hwangkanri, formations which were differentiated into Okcheon system unknown age by the previous workers, but are of reversed sequence. Myeongori and Bukrori formations of Okcheon System are regard by the author as part of Hwangkanri formation. Few other assumption of minor important taken by the previous workers as their positive evidences are carefully explained that they were misinterpreted.

• 한국노년학
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• v.29 no.2
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• pp.593-610
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• 2009

The Purpose of this study are to examine the middle-age and old worker's employment rates by age and gender at economic depression and recovery periods after the economic crisis, to identify the main 3causes of the change of the middle-age and old worker's employment rates between two periods, and to analyze whether the determinants affecting the middle-age and old worker's employment may be different by age and gender. For this study, The Annual Korean Labor Panel data(from 1st to 7th) are used. The results show that the employment rates are increased in the economic recovery period, and the difference between male and female employment rates decrease as ages go up. As we predicted, the determinants affecting the middle-age and old worker's employment are different by age and gender. For example, the existence of partner has positive effect on the male employment, but negative effect on female employment. The increases of the middle and old age worker's employment rates in the recovery period are mainly caused by the extension of the individualism(that is, the increases of the middle and upper class workers' employment), rather than the increases of the poor workers' employment rates due to the poverty(that is, the increases of the lower and poor class workers' employment). In the recovery period, comparing to the economic depression periods, the middle-age and old workers in the high class were likely to remain his(her) a good job while those in lower class are more difficult to get a job. This results show that the polarization of middle-age and old worker's employment has been appeared in the recovery periods(after 2001).

• Journal of Society of Preventive Korean Medicine
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• v.16 no.2
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• pp.67-81
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• 2012

Objective : This study aimed to analyze the utilization of Korean Medicine clinics, and high-frequent diseases by sex, age, and region of outpatients and inpatients Methods : The data for this study were "Report on Usage Patterns of Korean Medicine Clinics" issued by the Ministry of Health and Welfare in 2008. Descriptive analysis and correspondence analysis were used to find the patterns of patient's utilization by sex, age and region Results : Diagnosis and examination methods mostly consisted of the pulse for diagnosis. Treatment methods consisted of acupuncture, medical herbs in package, and insurance extract powder. Fee for consultation was paid by Korean Medicine insurance. Usage increased when people's age was over 20 and climaxed among people who were in their 40s and 50s and decreased gradually afterwards. Also, there were differences between the sexes. There were differences in high-frequent diseases by regions, and in usage of Korean Medicine clinics according to sex and age. Conclusion : It was found that there were differences in usage and patterns of Korean Medicine Clinics according to sex, age, and region.

• Journal of Forest and Environmental Science
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• v.28 no.1
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• pp.24-29
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• 2012

This paper assesses the stmpage value of Korean white pine (Pinus koraiensis) stands in the Research Forest of Kangwon National University. Assessment was done by means of the cost value method (Faustmann formula) for age class I, Glaser method for age class II-V, and inversion market method for age class over VI. Generally the value of stumpage is calculated by the inversion market method in the market. However, immature trees and middle age class trees are not assessed in market, and the Korean forest is not old enough to harvest. So, when forests are damaged by attacks from forest fire, blight and harmful insects, the forest cannot be compensated for the loss from the government or insurance company. For this reason, the value of all-age class trees are calculated by using appropriate methods. As a result, the value of age I class stands (0.3 ha) is calculated as 1,786,305 (won), age II-Vclass stands (22.1 ha) 206,677,975 (won) and age VI class and over stands (24.8 ha) 523,789,603 (won).

• Journal of the Korean Society of Clothing and Textiles
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• v.24 no.6
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• pp.850-860
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• 2000

The purposes of this study was to provide the fundamental data for children's wear standardizing sizes of ready-made clothes by analyzing the elementary school girls’somatotype. The subjects for anthropometic measurements were 434 elementary school girls’by age groups < ‘(1st age(1ㆍ2 grade)’,‘2nd age(3ㆍ4 grade)’, and 3rd(5ㆍ6 grade)’ > living in Pusan. According to the analysis of upper bodies by the age groups 1. According to the analysis to draw somatometric factors by the age groups, sevenㆍseven and six actors in 1st . End and 3rd age groups are obtained from measurements of upper body. 2. The 1st & 2nd age groups: As the result of factor analysis for the factor, the first and second factors which explain more than 70% of the whole variance represent“horizontal size”and“vertical size”, which characterize more aspects of the body shape of girls at elementary school ages. 3. The 3rd age groups: As the result of factor analysis for the factor, 6 factor which explain 74.39% of variance were extracted form anthropometic data. The first factor represented the items of circumference, breadth and depth related to“sectional size the front length of the upper body”, The second factor described the items of "heights & the back length of the upper body”.

• Korean Journal of Environmental Biology
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• v.28 no.1
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• pp.8-13
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• 2010

This study aimed the role of gold nanoparticles (AuNP) in advanced glycation end-products (AGEs) induced migration and invasion in bovine retinal endothelial cells (BRECs). BRECs were isolated from the retina. Cell viability was confirmed by the MTT assay. In vitro wound migration assay was performed to investigate the migration of BRECs. In vitro tube formation was measured by on-gel system. Apoptosis induced by AuNP was confirmed by caspase-3 assay. AGE-bovine serum albumin (BSA) demonstrated increase of cell migration and proliferation in BRECs. In addition, AuNP regardless of the existence of AGE-BSA suppressed proliferation, migration, and angiogenesis. AuNP suppressed AGE-BSA induced migration and invasion, and induced apoptosis through caspase-3. As a results, AuNP have a potential anti-angiogenic effect for AGE-induced angiogenesis in vitro and offer possibility for the treatment of diabetic retinopathy.

• International Journal of Highway Engineering
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• v.15 no.2
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• pp.121-129
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• 2013

PURPOSES : This study deals with the traffic accidents of rotary in Korea. The objective of this study is to develop the accident models by age group based on the various data of rotaries. METHODS : In pursuing the above, this study gives particular attentions to classifying the accident data of 17 rotaries by age, collecting the data of geometric structure, traffic volume and others, and developing the models using SPSS 17.0 and EXCEL. RESULTS : First, 3 multiple linear regression models which were all statistically significant were developed. The value of model of under 30-49 age group were, however, evaluated to be 0.688 and be less than those of other models. Second, the most powerful variables were analyzed to be traffic volume in the model of under 30 age group, circulatory roadway width in the model of 30-49 age group, and the number of approach lane in the model of above 50 age group. Finally, the test results of accident models using RMSE were all evaluated to be fitted to the given data. CONCLUSIONS : This study propose install streetlights, speed humps and widen Circulatory as effective improvements for reduction of accident in rotary.

• Asian-Australasian Journal of Animal Sciences
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• v.14 no.5
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• pp.640-645
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• 2001

In order to evaluate the change in plasma and fecal mineral content of calves to 6 days of age, and to clarify the relationship between electrolyte status and fecal consistency in calves at 6 days of age, data were collected from 52 Holstein calves. Fecal DM and Na of calves decreased at 6 days of age, but fecal Ca, P, Mg, K, Fe and Zn increased. Plasma Ca, inorganic P, Mg, Na, and Fe as well as blood hematocrit and hemoglobin of calves decreased at 6 days of age, but plasma alkaline phosphatase increased. Colostral Ca, P, Mg, Fe and Zn decreased with time postpartum, but colostral Na and K were not affected. The high plasma Na and K of calves at 6 days of age were influenced by the values at birth. There were negative correlations between fecal DM and fecal Na, and fecal K, of calves at 6 days of age, negative correlations between fecal DM and plasma Na, with plasma K. Plasma and fecal Na as well as plasma and fecal K of calves at 6 days of age were increased by the occurrence of diarrhea. These results suggest that the electrolyte status of calves at 6 days of age is adversely affected by the occurrence of diarrhea, and high plasma K and Na of calves at 6 days of age may be partly due to the electolyte status of calves at birth.

• Archives of Craniofacial Surgery
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• v.16 no.2
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• pp.58-62
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• 2015

Background: Age-related changes have been studied for lower and middle facial bones. Although the forehead comprises one-third of the facial area, no studies have investigated age-related changes in the upper part of the face or forehead. The purpose of this study was to use three-dimensional computed tomography (3D CT) to investigate age-related changes in the frontal bone. Methods: A retrospective review was performed for patients who underwent 3D CT scan of facial bones. Patients were divided by gender and age (20 to 40 years, 41 to 60 years, and above 60 years). The frontal bone curvature was evaluated by the length of frontal bone and by two frontal bone angles in relation to the Frankfurt horizon. Results: In both genders, aging was associated with increasing lower slope length. In elderly men (>60 years), the upper slope angle was significantly higher when compared to younger male subjects. Women demonstrated similar age-related changes, but the differences were only statistically significant for the middle and older age groups. Conclusion: This study demonstrates quantifiable age-related changes in the frontal bone. These findings contribute to the understanding of age-related changes of the facial soft tissues. The mean measurements in each age group can be used as a reference when planning forehead reconstruction.

• Journal of Animal Environmental Science
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• v.6 no.2
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• pp.97-104
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• 2000

This study was carried out to determine the effects of different weaning age on feeding performance and behaviour of piglets. Sixty crossbred(YLxD) litters of piglets were randomly alloted to be 15 pens with 4 piglets per pen and 5 pens per treatment by weaned at 14, 21, and 28 days. Pens were video-taped for 24 hours immediately at 7 weeks and 8 weeks of age. The piglets weaned at 14 and 21 days were significantly (P<0.05) much intake than piglets weaning at 28 days. The piglets weaning at 14 days were significantly lighter than piglets weaning at 14 and 21 days fro m2 weeks to 8 weeks age. However, feed conversion ration was significantly(P<0.05) improved according to late weaning days. Times spent engaged in Feeding, lying and walking were similar in piglets across weaning age. They also showed similar occurrence of drinking and agonistic behaviour at 7 weeks and 8 weeks of age. Piglets weaned at 14 days exhibited more belly-nosing behaviour at 7 weeks of age, but similar in piglets at 8 weeks of age across weaning age. We concluded that piglets performance influenced by weaning day, however time spent for feeding, lying and walking behaviour were no significance. Drinking, Agonistic and belly-nosing were not significantly different by weaning age.