• The Journal of the Convergence on Culture Technology
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• v.6 no.2
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• pp.535-541
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• 2020

A conventional elastic material replacement and performance evaluation are very complicated and time-consuming, and it is difficult to know when to replace the elastic material in advance. By comparing with the product limit and the functional limit, the necessity of elastic material replacement and the improvement of track support stiffness according to replacement can be immediately demonstrated based on experimental data. Using an evaluation system of track support stiffness, the performance evaluation data for elastic materials obtained through field tests using software for track support stiffness is integrated and managed on the administrator's computer. Therefore, the replacement plan is established and maintenance history is managed by identifying the replacement time and location of elastic materials. It is possible to evaluate the performance and condition of the elastic material at the various points during the working time of the track inspection and the track performance (track support stiffness) and durability of the elastic material (aging level, spring stiffness variation rate, etc.) at the operation condition. The elastic material could be replaced timely, and the deterioration of the elastic material can be continuously monitored.

• Geotechnical Engineering
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• v.10 no.3
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• pp.5-16
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• 1994

This paper presents a new method to improve the bearing capacity of a square shallow foundation placed on a sand layer reinforced with geogrids which shows promise for further field work. The geogrid reinforcement will be necessary in the case of machine foundation, embankments for railroads, and foundations of structures in earthquake-prone areas. The ultimate bearing capacity (UBC) for the unreinforced sand and reinforced sand has been compared. Also, the effect of length, spacing, width of reinforcement on increasing the UBC have been evaluated. Based on the present model test results, it appears that significant improvement in the UBC of medium sand can be achieved by geogrid reinforcement.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.34 no.1
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• pp.49-54
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• 2010

Fretting wear behavior under elastic deformable contacts was experimentally examined by using a simulated dual cooled fuel rod and its supporting structure. As this fuel rod has larger outer diameter than the typical solid rod to accommodate sufficient internal flow, new supporting structure geometries should be designed and their reliabilities (i.e. vibration characteristics, fretting wear resistance, etc.) are also examined with both analytical and experimental methods. In this study, the supporting structure characteristics and fretting wear behaviors are analyzed and examined by using one of the supporting structure candidates which has an embossing shape. The supporting structure characteristics were examined by using a specially designed test rig and their results were compared with that of analytical method. Based on the test results, the relationship between the supporting structure characteristics and their fretting wear behaviors was discussed in detail.

• Journal of Korean Tunnelling and Underground Space Association
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• v.8 no.3
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• pp.273-287
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• 2006

This study investigates the failure mechanism and load-carrying capacity of a single-shell lining which has no disturbance in transfer of shear force, with respect to a conventional double-shell lining which has separation between layers of shotcrete lining and secondary concrete lining by water-proof membrane. In order to evaluate the capacity, a 2-D numerical investigation is preliminarily carried out and then real-scale loading tests with tunnel lining section specimens are performed on the condition given by the numerical investigation. In the test, a concentrated load is applied for considering a released ground load or rock wedge load. Through this study, it appears that the single-shell lining takes the load-bearing capacity 20% higher than in case of the double-shell lining. In addition, a possibility of a composite single-shell shotcrete layer composed by multiple bonded layers partly involving different contents of high-capacity additives is shown thereby leading to use of less amount of the high-capacity additives on the condition of taking a similar load-bearing capacity.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.13 no.1
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• pp.89-104
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• 2018

The purpose of this study is to examine the relation between entrepreneurial self-efficacy and entrepreneurial intention, and analyze how social support gained through social relations influences on the relation between entrepreneurial self-efficacy and entrepreneurial intention. This study outcome is as in the following. First, both general corporate and preliminary social entrepreneur are to examine that entrepreneurial self-efficacy positively influences the entrepreneurial intention. Second, in the case of the social support, it didn't influence on preliminary general corporate. And only feedback support and instrument support are related to influence on preliminary social entrepreneur among social supports. This study shall have a significance in using the result of previous studies that entrepreneurial self-efficacy influences on entrepreneurial intention by looking into moderating effect of social support, classifying general corporate and preliminary social entrepreneur who have the entrepreneurial intention.

• Journal of agricultural medicine and community health
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• v.33 no.1
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• pp.46-58
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• 2008

Objectives: This study was performed to investigate the levels of psychosocial stres and to identify its Methods: The study subjects were 1,806 adults aged 40-70 years living in Naju City, Jeollanamdo. Sociodemographic characteristics, health-related behavior, social suport and personality were collected for statistical analysis. The measurement instrument of psychosocial stress was psychosocial well-being index. The regression analysis. Results: The results showed that 16.6% of subjects were categorized as high stress, 63.4% as moderate, and 20.0% as normal. Overall, the mean value of PWI was 17.29.8 and significantly diferent by socioeconomic characteristics, health-related behavior, social suport and personality. In the case of men, the income, decreased positive social suport, increased negative social suport, type A behavior pattern, decrease of internal locus of control or poorer self-esteem. In the case of women, the PWI was significantly deteriorated in the subjects with no job, no spouse, decreased positive social suport, increased negative social support, type A behavior pattern, decrease of internal locus of control or poorer self-esteem.Conclusions: The psychosocial stres for rural residents was related with social suport and personality. Thus, these results should be considered to reduce stres levels in rural adults.

• Journal of Korean Home Economics Education Association
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• v.23 no.1
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• pp.37-51
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• 2011

The purpose of this study was to examine the effects of temperament, family strength and social support on ego-resilience of adolescents. Four hundred fifty middle and high school students in Incheon participated. Temperament, family strength, social support and ego-resilience were evaluated by self-report questionnaires. Data were analyzed using factor analyses, t-tests, descriptive statistics, correlations and standard multiple regression analyses. Results indicated that there was significant gender difference in ego-resilience. Adolescents' ego-resilience was positively associated with activity level and persistence in temperament, family strength and social support, but negatively associated with rigidity in temperament. Furthermore, gender, temperament, family strength and social support of class teacher and close friends significantly predicted ego-resilience of adolescents.

• Journal of the Korean GEO-environmental Society
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• v.2 no.3
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• pp.71-80
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• 2001

The quantitative analysis of bearing capacity with stone column-mat is not ease because the bearing capacity of stone column is affected by so many parameters. The bearing capacity of stone column is mainly governed by horizontal resistance along the interface with soil. Also, this foundation system is affected by geometric factors such as column spacing, embedment ratio and failure surface inclination. Therefore, in this study, critical length and the effect of failure surface inclination was studied with single and group end bearing stone columns by loading tests. Results of model tests are compared to the present theoretical methods and are examined with FEM analysis.

• Proceedings of the Korean Nuclear Society Conference
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• 1998.10a
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• pp.257-257
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• 1998

• Asia Marketing Journal
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• v.4 no.2
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• pp.104-132
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• 2002

본 연구는 소비자들의 광고평가과정을 정보처리능력의 관점인 사전지식과 정보처리동기의 관점인 관여도의 조절적 역할을 고려하여 검토하였다. 이를 위하여 본 연구에서는 인지자극과 감정자극이 동시에 제공된 광고에 대하여 소비자들의 인지적, 감정적, 행동의욕적 평가관계를 구조적으로 살펴보고, 이를 바탕으로 각 구조적 관계들을 사전지식수준과 관여도수준에 따라 그 상대적 역할들을 살펴보았다. 실증분석결과 본 연구는 기존의 DMH 모델을 지지하는 것으로 나타났으며, 특히 광고에 대한 감정적 평가(Aad)에서 상표에 대한 인지적 평가(Cb)통해 상표에 대한 감정적 평가(Ab)에 미치는 영향력의 정도는 관여도보다는 사전지식이 더 큰 역할을 하는 것으로 나타났다. 또한 광고에 대한 감정적 평가(Aad)에서 상표에 대한 감정적 평가(Ab) 그리고 상표에 대한 감정적 평가(Ab)에서 상표에 대한 행동의욕적 평가(Ib)로의 영향력은 관여도가 중요 조절변수임을 확인하였다.