• Proceedings of the Korean Geotechical Society Conference
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• 2008.10a
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• pp.792-798
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• 2008

CPT 시험은 지난 30여년 동안 지반조사 분야에서 널리 이용되어 왔다. CPT 콘의 근입은 항타말뚝의 근입방법과 유사하기 때문에, CPT 콘의 선단저항력을 이용하여 말뚝의 지지력을 산정하려는 연구가 많이 수행되어 왔다. 본 연구의 목적은 기존에 제안된 CPT 선단지지력 공식의 적용성을 분석하는 것이다. 이를 위해 낙동강 하구 대심도 연약지반에서 수행된 항타 PHC 말뚝에 대한 총 172개의 PDA 시험자료와 80개소의 CPT 자료를 수집하였다. PDA시험의 CAPWAP분석에서 얻어진 선단지지력과 각 CPT 지지력 공식에서 산정된 선단지지력을 비교함으로써 각 공식의 적용성을 분석하였다. 분석에 이용된 CPT 지지력 공식은 Aoki 방법, Meyerhof 방법, Penpile 방법, Philpponnat 방법, LCPC 방법, Schmertmann 방법, Zhou 방법, ICP 방법, Eslami & Fellenius 방법, 그리고 UWA-05 방법의 총 10가지이다. 분석결과, Aoki 방법, Phillipponnat 방법, ICP 방법 그리고 LCPC 방법 순으로 그 적용성이 높은 것으로 나타났다.

• Proceedings of the Materials Research Society of Korea Conference
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• 2009.05a
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• pp.47.2-47.2
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• 2009

인체의 뼈와 같은 손상된 경조직을 치료 또는 대체하기위한 정형외과용 임플란트를 설계하는데 있어 뼈의 생체역학적 특성과 유사한 성질을 갖는 다공성 지지체에 대한 연구가 최근 관심을 끌고 있다. 다공성 지지체는 조직이 원활히 재생될 수 있어야 하며, 또한 주변 조직과도 생물학적인 고착이 잘 되도록 기공들이 상호 연결된 구조를 가져야 한다. 이와 같은 다공성 지지체용 소재를 제조하기 위하여 본 연구에서는 타이타늄 분말을 사용하여 3차원 적층조형공정으로 다공성 타이타늄 지지체를 제조하였다. 제조된 다공체의 물성 및 기계적 특성을 평가하기 위하여 압축시험과 변형해석을 수행하였으며, 아울러 제조된 지지체의 생체적합성 향상을 위하여 양극산화 공정 등의 표면처리를 수행하여 그에 대한 특성을 평가하였다. 분말야금 공정으로 제조된 지지체는 골조직의 성장에 적합한 약 $300\sim400{\mu}m$의 기공 크기를 갖도록 제어하였고, 기공도는 60~75%로 제어하였다. 아울러 다공성 타이타늄의 생체적합성을 부여하기 위하여 양극산화공정으로 지지체의 표면에 Ca 및 P을 포함하는 산화층을 형성시키는 표면처리를 수행하였다. 양극산화공정에 의하여 표면에 미세기공을 포함하는 산화층을 형성시킬 수 있었으나 이와 같은 표면구조는 조골세포의 부착과 영향에는 큰 영향을 미치지 않는 것으로 확인되었다.

• Korean Journal of Culture and Social Issue
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• v.21 no.1
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• pp.45-66
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• 2015

This study explored the moderating effects of social supports (family support, home friends support, foreign friends support) and cultural identity (home identity, foreign identity) on the relationships of reverse culture shock and subjective well-being. Participants were 157 returnees who left home-country prior to the age of 19 and resided in the foreign-country for more than three years. The results of hierarchical regression analyses on two-way interaction effect between reverse culture shock and each hypothesized moderator (e.g., family support, home friends support, foreign friends support, home identity, foreign identity) indicated that reverse cultural shock and subjective well-being was negatively related and their relationship was moderated only by family support. Specifically, the relationship between reverse culture shock and subjective well-being was weaker when the level of family support was higher. Subsequently, three-way interaction among reverse culture shock, one of the social support factors, and one of the cultural identity factors was investigated using hierarchical regression analyses. The results showed that the three-way interaction among reverse culture shock, family support, and home identity was significant. The slope difference tests yielded that the relationship between reverse culture shock and subjective well-being was stronger when both levels of family support and home identity were lower compared to when either level of family support or home identity was higher. These results imply that environmental factors such as family support and intrapsychic factor such as home identity might function as a buffer against the negative consequences of reverse culture shock experience.

• The Journal of the Korea Contents Association
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• v.16 no.6
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• pp.462-473
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• 2016

This study was proposed in obtaining basic data for an intervention programs of the stable child care by identifying the effects of support from the spouse and family on the child rearing among marriage immigrant women. Subjects consisted of 110 marriage immigrant women in Gyeonggi-do in December, 2014. SPSS/WIN 22.0 program was used for ANOVA, Pearson's correlation and multiple regression analysis to figure out burden and efficacy of child rearing through the general characteristics. The increased burden of child rearing was statistically significant with young age, lower level of education, low income and less spending time to raise their children by husband. Additionally, the increased efficacy of child rearing was statistically significant with young age and using two languages. The pressure of the child rearing showed a negative correlation with spouse support, income, and old age. The efficacy of child rearing had a positive correlation with spouse support, spending time to take care of their children by family, and ages. In the regression analysis, the burden of child rearing among immigrant women increased by old age (${\beta}=-2.097$, p<.05) and less time to raise their children by husband (${\beta}=-2.165$, p<.05). It is important to provide spouse and family support to encourage desirable child rearing behavior. These results may provide to improve intervention programs for child rearing among marriage immigrant women.

• The Journal of the Korea Contents Association
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• v.11 no.9
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• pp.225-237
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• 2011

The purpose of this study was to analyze the Relationshipss of Ego-Identity, Social support and Mental health of Adolescents. The subjects for this study were 347 adolescents composed of 169 middle school students, 347 high school students in Kyung-gi Do. The data was conducted by using a correlations coefficient and the multiple regression analysis. The results of the study were as follows: First correlations among measured subordinate variables of Ego-Identity, Social support on subordinate variables of Mental health of Adolescents were significant. except compulsiveness and support of friend, hostility, phobia and support of teacher, somatization and confidence of one's future, intimacy, support of teacher, support of friend, depression, psychosis and confidence of one's future. Second, the result of the multiple regression analysis, the significant variables affected mental health are ranked in the order of self-acceptance, aim for goal, support of parents, intimacy, independence. while confidence of one's future, leading, support of teacher, support of friend are not significant. The result of this study shows that adolescents of high level of self-acceptance, aim for goal, intimacy, independence and perceived highly support of teacher are high level of mental health.

• Journal of the Korean GEO-environmental Society
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• v.16 no.9
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• pp.33-41
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• 2015

The vertical bearing capacity of a bucket foundation installed in sand can be calculated as sum of the skin friction and end bearing capacity. However, the current design equations are not considering the non-associated flow characteristics of sand and the reduction in the skin friction and increase in the end bearing capacity when the vertical load is applied. In this study, we perform two-dimensional axisymmetric finite element analyses following non-associated flow rule and calculate the vertical bearing capacity of circular bucket foundation of various sizes installed in sand of different friction angles. After calculating the skin friction and end bearing force at the ultimate state, design equations are derived for each. The skin friction of bucket foundation is shown significantly small compared to the end bearing capacity. Considering the difference with the available design equation for piles, it is recommended that the equation for piles is used for the bucket foundation. A new shape-depth factor ($s_q{\cdot}d_q$) for bucket foundation is recommended which also accounts for the increment of the end bearing capacity due to skin friction. Additionally, the shape and depth factor of embedded foundation proposed from the associated flow rule can overestimate the bearing capacity in sand, so it is more adequate to use the shape-depth factor proposed in this study.

• Journal of the Korean Geosynthetics Society
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• v.13 no.2
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• pp.31-39
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• 2014

The helical pile is a manufactured steel pile consisting of one or more helix-shaped bearing plates affixed to a central shaft. This pile is installed by rotating the shaft into the ground to support structural loads. The advantages of helical piles are no need for boring or grout process, and ability to install with relatively light devices. The bearing capacity of the helical pile is exerted by integrating the bearing capacity of each helix plate attached to the steel shaft. In this paper, to estimate the bearing capacity of moderate-size helical piles, 6 types of helical piles were constructed with different shaft diameter, plate configuration and the penetration depth. A series of field loading tests was performed to evaluate the effect of helical pile configuration on the bearing capacity of helical pile, constructed in two different shaft diameters (i.e. 73 mm and 114 mm). In the same way, the diameter of bearing plate was also changed from 400mm to 250mm with one or three plates. As well, the penetration depth was varied from 3m to 6m to analyze the relation between the penetration depth and the bearing capacity. As a result, not only the increase of the shaft diameter, but also the number or diameter of helix bearing plates enhances the bearing capacity. Especially the configuration of the helix plate is more critical than the shaft diameter.

• Korean Journal of Child Education & Care
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• v.18 no.4
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• pp.51-63
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• 2018

Objective: The purpose of this study was to verify the influence of educare teachers' self-encouragement and social support on their psychological burnout. Methods: This study was 329 educare teachers working in Jeju Special Self-Governing Province. The questionnaire for this study (self-encouragement scales, social support scales, and psychological burnout scales) was conducted and t-test, F-test, Turkey post test, Pearson Correlation analysis, simple regression analysis and multiple regression analysis was conducted by using the SPSS windows 18.0 program. Research results of analysis were as follows. Results: First, the difference of self-encouragement of educare teachers was remarkable according to age group and that of social support noticeable according to age group and career while that of psychological burnout was noticeable according to age group and marital status. Second, educare teachers' self-encouragement and social support has negative correlation with their psychological burnout. Third, educare teachers' self-encouragement and social support affect their psychological burnout in negative manner. In particular, self-encouragement functions, more than social support, as a main factor in reducing psychological burnout. Conclusion/Implications: These results can be utilized as basic data for developing education and counselling programs designed to provide emotional stability for educare teachers and help them give more positive child-care service.

• Journal of Korean Society of Neurocognitive Rehabilitation
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• v.10 no.2
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• pp.19-26
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• 2018

Many people do not realize that they have poor neck posture. Incorrect forward head posture can lead to turtle neck. This aim to development of specific chair to reduce tension and other symptoms of turtle neck posture. This turtle neck syndrome adjusting chair is a chair that supports the hip and shin of a person to help them correct their posture. It is consisted of the shin support that supports the shin in an angle and the hip support that supports one's hip while the shin is supported at an angle, the main frame that has the two of them connected and the fluid seat that is joined at the top of the hip support and reacts accordingly to the shape of the hip. This is a posture correction chair which has the fluid seat that provides unstable hip support so that it can allow a person to realize their posture from the constant stimulation about the posture. When one seats on the posture correction chair, their hip and shin are supported at an angle that straitens their back, and as their back is straightened, their shoulders and chest are opened, and the neck is positioned at the middle to help them correct their posture. An unbalanced posture causes discomfort to the person seated at the chair, and the person sitting on the posture correction chair will continuously adjust his/her posture to balance the hips to keep the correct posture. Through this process, the person shall adjust his/her left and right posture, ultimately increasing the effectiveness of posture correction. A future collective study on the continuous posture correction of people having turtle neck syndrome using this posture correction chair is required.

• Journal of the korean Society of Automotive Engineers
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• v.9 no.2
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• pp.17-27
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• 1987

최근 자동차기술의 발달로 인한 차량의 경량화, 고급화 추세는 더욱 개선된 승차감을 요구하고 있다. 승차감에 영향을 미치는 주요인으로서는 엔진의 진동과 소음, 변속장치, 구동축 등의 구동 계통의 진동 및 소음, 그리고 노면으로부터의 진동, 외부 공기의 흐름에 의한 소음 등 여러가지가 있다. 엔진지지계는 이중 엔진의 진동 및 소음을 절연하는 기능을 맡고 있고 동시에 엔진하중의 지지, 변위제한, 충격흡수 등의 기능도 가지고 있다. 실제에 있어서 엔진지지계는 진동 및 소음 절연의 기능 외에 다른 기능도 갖고 있으나 이중 가장 어렵고 해석이 곤란한 것은 결국 진동절 연성능이라고 할 수 있다. 그러나 여러 가지 제약조건이 있으므로 최적의 진동절연특성의 실 현이 항상 가능한 것은 아니고 방진고무의 특성치난 지지각도 등의 어느 범위안에서만 선택이 가능하므로 실제 설계에 있어서는 적용상의 특정조건을 만족시키는 초기설계치를 정하여 그때의 진동절연특성을 평가하고 기준이하일때는 설계치를 재조정하여 다시 평가하는 접근방식이 실질 적이다. 따라서 이 설계과정에 필요한 엔진지지계의 진동절연특성해석 및 평가용 컴퓨터 프로 그램을 개발하였으며 그 해석치와 실험결과를 비교하여 타당성을 입증하였다.