• Journal of The Geomorphological Association of Korea
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• v.24 no.3
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• pp.47-59
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• 2017

This study aims to analyze geomorphologically Jaein Falls in Hantangang Lava Plateau for the landform structure, landform classification, falls dissection and recession. The height and recession length of the Falls are approximately 18m and 340m. after dissection valley arrive at area of the Jijangbong Volcanic Rock Complex of Mesozoic era, the fall will disappear. The structure of the dissection valley shows totally well vertical columnar joint near falls and plunge pool, colluvial talus deposits toward lower reach by the freezing-thawing and wet-dry activities, and alluvial cone and delta in estuary to Hantangang River. The Falls' age date and recession rate in the valley maybe relate to the age of the lava plateau. The estimated recession rate of the fall should be 8.75m/ka to 2.3m/ka, depending on the age 500ka to 40ka in lava plateau.

• Proceedings of the Korea Concrete Institute Conference
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• 2002.10a
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• pp.795-798
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• 2002

Recently. the properties of early-age concrete are increasingly important because these properties directly influence the behavior of early-age concrete structures including stress and cracking behavior. Nevertheless, the studies on early-age concrete are limited to strength and temperature development. The purpose of present study is to propose a simple and rational method which can predict the stress and strain behavior of young age concrete. A series of test have been done to measure the temperature development, strains and stresses in concrete members. The concept of equivalent age was used to define the degree of hydration and this degree of hydration was used to calculate the strength and elastic modulus. The present study indicates that the calculated stresses correlate fairly well with measured stresses. The consideration of critical degree of hydration in calculating stresses gives more accurate results. The present study provides useful method and data in evaluating early-age behavior of concrete structure.

• Korea journal of population studies
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• v.21 no.2
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• pp.58-82
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• 1998

It is usually proposed that job security of old age workers is hampered by the structure of wage increasing with age. This paper sets forth a model to comprehend the characteristic of the old age workers' labor market and policy implications derived from it. In order to stimulate demand for old age workers, policy initiatives should be taken as follows : the wage criteria should be simplified which apply differently from one institution to other; incentives relatively favorable for employing old age workers' in manufacturing sector should be also given to service sectors; employment subsidy or other tax incentives should be given for labor contract after the retirement age; licensing and evaluation system for job ability should be introduced based on occupation & job analysis. To lower the reservation wage of workers, mortgage loan for house and long-term low interest loan for tuition fees should be developed together with stabilization of housing cost. Wedding culture which requires high expense should be amended. Above all, it is necessary to install reasonable social security system. Policy orientation should also pay attention to reduce labor supply of the old aged via aiding old age workers' firm opening and voluntary civil service together with developing various honor programs for members of civil corps.

• Clinical and Experimental Reproductive Medicine
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• v.40 no.1
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• pp.23-28
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• 2013

Objective: The aim of the present study was to examine the relationship among male age, strict morphology, and sperm chromatin structure and condensation. Methods: Sperm samples from a total of 100 men underwent semen analysis, and sperm chromatin structure and condensation were assessed with toluidine blue (TB) and aniline blue (AB) tests. Results: Prevalence of strict morphology of less than 4%, and abnormal sperm chromatin structure and condensation did not show any statistically significant differences according to male age (p=0.605, p=0.235, and p=0.080). No significant correlation was demonstrated among age of male partners, strict morphology, and abnormal sperm chromatin structure using TB and AB tests. However, abnormal sperm chromatin condensation was positively associated with sperm chromatin structure (r=0.594, p=0.000) and showed negative correlation with strict morphology (r=-0.219, p=0.029). Conclusion: The tests for sperm chromatin condensation showed a significant association with strict morphology. Further study is needed to elucidate the relationship between clinical outcome and sperm chromatin tests.

• KOMUNHWA
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• no.69
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• pp.5-40
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• 2007

The research against Youngdong area Bronze Age settlement structure the condition where the investigation against the area and the remains which are limited becomes accomplished and Only the dwelling site will be investigated from the early settlement of most and recognition there is not a possibility which it will investigate synthetically. The Early settlement to the time which reaches the size of the settlement is small and From Bangnae-ri phases the house possession area increases inside the hill and it follows on south and if dwelling site numbers under increasing, from the aspect where the size of the settlement is magnified seems and it is a position. The Middle settlement currently was confirmed as the beginning from the room village A ruins, it investigates a settlement structure to, the increase of data is necessary. Is Pottery with clay stripes, phases the Later Settlement which Dwelling site, Storeage, Earthenware Kiln, Ditch enclosure and Tomb, the Public dwelling site back large scale Pottery with clay stripes settlement of formation will be investigated from Bangdong-ri settlements which correspond to Songhyun-ri settlement which is a hill characteristic settlement which is located in rivers circumference and the higShland characteristic settlement to provide the data the cultural aspect and character and a settlement structure of Bronze Age postscript and it will be able to grasp.

• Journal of the Korean Society of Radiology
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• v.14 no.7
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• pp.947-956
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• 2020

The human body becomes vulnerable to various diseases due to deterioration in structure and function as it ages. In particular, changes in brain structure weaken the immune system against diseases such as vascular and metabolic neuropsychiatric diseases. In this study, we used a magnetic resonance imaging technique that allows non-invasive observation of brain structures and measurement of how the volumes of the brain, gray matter, white matter, and subcortical regions changes with aging in women aged 65 to 85 years. As a result of our investigation, we observed a significant linear decrease in subcortical regions with age. These results suggest that the changes due to aging in the brain structure area are closely related to neuropsychiatric diseases in old age, and can provide information in understanding the vulnerability of the brain in old age.

• Journal of the Korean Home Economics Association
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• v.39 no.7
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• pp.71-84
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• 2001

The purpose of this study was to investigate the development of preschoolers'narrative competence. The subject were 60 preschoolers aged 3 through 5 years who were enrolled in the day care center All the subjects were asked to produce a new story. All the story children toad were recorded on audiotape. The data were analyzed Qualitatively and quantitatively using content analysis and the statistical package for Social Science 9.0. The main results of this study were as follows. 1) Significant age difference was observed in preschooler's narrative structure. Older children produced structurally more complex stories containing setting, character, initiating event, attempt and consequence than younger children. 2) Significant age difference was observed in preschooler's narrative length. Older children used significantly more words and sentence when they produced stories than younger children.3) Preschooler'narrative structure was significantly correlated with narrative length.

• Asia pacific journal of information systems
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• v.24 no.4
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• pp.531-557
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• 2014

Although the area of information security planning and management has gained an increased attention, not much discussion was available on the role and the impact of the board members towards a firm's security management and governance decisions. In this research, we draw on corporate governance and the organizational demography literature to conduct an exploratory empirical study on the association between the board structure of a firm and the possibility of information security breaches. Our results show that the board size, the average age/tenure and the heterogeneity of age could reduce the possibility of security breaches while the proportion of independent directors and the heterogeneity of tenure could increase it. Our findings shed lights on the important role played by the board when managing information security risks in organizations.

• Journal of applied mathematics & informatics
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• v.25 no.1_2
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• pp.35-50
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• 2007

In this work, optimal harvesting policy for the predator-prey system of three species with age-dependent and diffusion is discussed. Existence and uniqueness of non-negative solution to the system are investigated by using the fixed point theorem. The existence of optimal control strategy is discussed and optimality conditions are obtained. Our results extend some known criteria.

• Journal of the Korean Professional Engineers Association
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• v.24 no.6
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• pp.45-55
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• 1991

Recently Factory Saemaul Undong is stagnant and spirits of Self-helf, Diligence, Cooperation goes off the public in general our society. After the 1988 year, Factories have a sickely constitution of industrial structure for Saemaul spirits fading. So, it is now a thing of the past in the 1973~87 year's active Factory Saemaul Undong of Korea industrial rationalization movement. Come on the new age 1990's, it make a special study renew method and newly technique of Factory Saemaul Undong promoting for democratic new age.