• Journal of the Korean Home Economics Association
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• v.50 no.5
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• pp.1-12
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• 2012

The purpose of this study is to examine: (1) the relationships among socially prescribed perfectionism, pessimism, and emotional problems represented by levels of depression and anxiety in children; and (2) whether or not pessimism mediates the relationship between children's socially prescribed perfectionism and emotional problems. 441 fifth and sixth graders residing in the national capital region participated in the study. Their data were collected with self-reported questionnaires in school class settings. Descriptive statistics and Pearson's product correlation coefficients were obtained using SPSS (version 18.0), and tests of the mediation were performed using SEM with AMOS (version 20). Significant correlations between children's socially prescribed perfectionism, pessimism, and emotional problems exist. Also, pessimism appears to partially mediate the relationship between children's socially prescribed perfectionism and emotional problems. These results seem to indicate that mitigating pessimism could reduce the possibility of experiencing emotional problems, such as depression and anxiety, in children who have strong beliefs to live up to the high standards, set unrealistically by others.

• Journal of the Korea Convergence Society
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• v.9 no.5
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• pp.171-177
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• 2018

The objective of this study is to investigate the effect of unrelated diversification on earnings management, and then to analyze the moderating effect of Audit Committee on the relationship. The sample of this paper consists of 206 firms and 1,924 firm-year data listed on Korea Exchange from 2000 to 2009. The results are as follows. First, unrelated diversification is positively associated with earnings management. Second, there are the moderating effects of Audit Committee establishment and independence on the relevance between Unrelated-diversification and earnings management. These findings imply that it is important to strengthen the effectiveness of Audit Committee in unrelated diversification firm.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• v.2
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• pp.455-458
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• 2006

관성항법장치는 관성항법장치를 구성하는 관성센서인 가속도계 및 자이로의 오차요소에 의해 수평축 항법오차는 슐러주기를 가지고 서서히 증가하는 반면에 수직축 오차는 기하급수적으로 증가하는 특성을 가지고 있다. 그러므로 관성항법장치를 장시간 운용하는 경우에는 비관성 보조센서를 이용하여 관성항법장치의 수직축 항법오차에 대한 보정을 반드시 수행하여야 한다. 관성항법장치의 수직축 항법오차를 보정하기 위한 비관성 보조센서의 일종인 기압고도계는 계측된 대기압과 모델링 된 대기압을 비교하여 항체의 고도를 측정하는 방법을 이용하기 때문에 항체의 자세변화 등에 매우 민감하고 대기압 측정오차에 의해 매우 큰 진폭의 잡음 및 바이어스가 존재한다. 본 논문에서는 시뮬레이션 및 시험을 통하여 기압 고도계의 잡음 및 바이어스 오차 성분에 의한 baro-inertial 고도루프의 성능분석 결과를 제시하고 기압고도계 잡음에 둔감한 INS/기압고도계 칼만필터의 설계 결과를 제시한다.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.40 no.5
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• pp.395-404
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• 2012

This paper presents computations of the dynamic derivatives of three dimensional flight vehicle configurations using CFD. The pitch dynamic derivatives are computed from the pitch sinusoidal motion, while the roll damping is computed based on steady state calculation using a non-inertial frame method. The Basic Finner and the SDM(Standard Dynamic Model) are chosen for the benchmark tests against other numerical and experimental results. For the flow calculations, a 3-D Euler solver that can be run both on the non-inertial frame and on the inertial frame is developed. A dual-time stepping method is applied for the unsteady time accurate simulations. A good agreement of pitch-roll dynamic derivatives with previously published numerical results and the experimental results is observed.

• Child Health Nursing Research
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• v.14 no.4
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• pp.388-395
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• 2008

Purpose: The purpose of this descriptive study was to identify predictors of behavior that promotes health in middle school students. Method: The participants for this study were 361 students from one middle school, located in Gangwon province. The data were collected by a questionnaire given to the students. Descriptive statistics, t-test, ANOVA, Pearson's correlation coefficients and stepwise multiple regression were used to analyze the data. Results: The highest score for behavior promoting health was refraining illegal substances abuse. There was a significant positive correlation between behavior promoting health and optimism. There was a significant reverse correlation between behavior promoting health and pessimism, and also between optimism and pessimism. The predictors of behavior promoting health in middle school students were optimism, school life, pessimism, school record, grade, and smoking. These factors explained 25.7% of the total variance and the most powerful predictor was optimism (15.5%). Conclusion: The findings from this study, indicate a need to develop a nursing intervention programs to promote health behavior in middle school students including the promotion of optimism.

• Journal of Biomedical Engineering Research
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• v.5 no.2
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• pp.143-148
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• 1984

비접합성 골절의 치료를 위한 전기적인 방법으로는 관혈적이 방법, 부분적으로 관혈적인 방법, 비관혈적인 방법 들이 있는데, 비관혈적인 방식은 다른 방법들과는 달리 수술 등 외과적 처기 등이 필요하지 않을뿐더러 환자에게도 가장 안전한 방식이다. 본 논문에서는 유도 결합 현상을 이용한 반관혈적인 전기 자기 자극기를 설계, 제작하였으며, 임상 실험 겨과 좋은 결과를 보이고 있다.

• Asia Marketing Journal
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• v.3 no.3
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• pp.1-24
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• 2001

본 연구는 자원의존이론, 거래비용이론, 관계계약이론 등의 선행연구를 검토하여 관계지향성의 원인과 성과를 밝히고자 하였다. 먼저 구매기업과 공급기업간의 행동적 관계지향요인과 관계지향성 분석을 실시하였다. 행동적 관계지향요인으로는 정보교환, 조화노력, 행동적 규범, 업무결속을 들고, 관계지향성 분석을 위해 군집분석을 실시하였다. 연구표본에는 C지역의 전문건설업체를 대상으로 500부의 설문지를 배포, 그 중 185부를 회수하여, 적합한 설문 140부가 사용되었다. 군집분석결과 관계지향성 집단은 정보교환, 조화 노력, 협동규범 수용, 업무결속이 모두 높게 나타났고, 비관계지향성 집단은 정보교환, 조화노력, 협동규범 수용, 업무결속이 모두 낮게 나타나 기업간의 관계지향성을 의미있는 2개의 집단으로 나눌 수 있었다. 둘째, 기업간 관계지향성의 영향요인으로 환경의 역동성, 대안의 이용가능성, 공급의 중요성, 상호호혜전략, 신뢰성을 검토하였다. 본 연구에서 선정한 관계지향성에 대한 영향요인들이 관계지향집단과 비관계지향집단으로 분류하는데 얼마나 유용하게 이용될 수 있는가를 알아보기 위해 판별분석을 실시하였다. 관계지향집단과 비관계지향집단의 분류에 환경의 역동성, 대안의 이용가능성, 공급의 중요성은 영향이 없는 것으로 나타났으며, 호혜전략, 신뢰성은 의미가 있는 것으로 나타났다. 셋째, 기업간 관계지향성의 성과로서 실현경쟁우위와 관계유지의도를 검토하였다. 관계지향성이 성과에 어떠한 영향을 미치는가를 검증하기 위해 MANOVA(multivariatee analysis of variance)분석을 실시하였다. 실증 결과, 관계 정도가 높은 집단이 관계 정도가 낮은 집단보다 실현 경쟁우위수준을 높게 지각하고 관계를 유지하려는 의도가 높은 것으로 나타났다.

• Korea journal of population studies
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• v.11 no.1
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• pp.1-13
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• 1988

This study examines the sampling bias that may have resulted from the large number of missing observations. Despite well-designed and reliable sampling procedures, the observed sample values in DSFH(Demographic Survey on Changes in Family and Household Structure, Japan) included many missing observations. The head administerd survey method of DSFH resulted in a large number of missing observations regarding characteristics of elderly non-head parents and their children. In addition, the response probability of a particular item in DSFH significantly differs by characteristics of elderly parents and their children. Furthermore, missing observations of many items occurred simultaneously. This complex pattern of missing observations critically limits the ability to produce an unbiased analysis. First, the large number of missing observations is likely to cause a misleading estimate of the standard error. Even worse, the possible dependency of missing observations on their latent values is likely to produce biased estimates of covariates. Two models are employed to solve the possible inference biases. First, EM algorithm is used to infer the missing values based on the knowledge of the association between the observed values and other covariates. Second, a selection model was employed given the suspicion that the probability of missing observations of proximity depends on its unobserved outcome.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.41 no.1
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• pp.1-6
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• 2017

Ballistic impact on a soldier wearing a helmet can induce fatal injury, even if the helmet is not penetrated. Although studies on this type of injury have been performed, most of them have used an analytical model focused on head injury only. The injury of the neck muscles and cervical vertebrae by non-penetrating ballistic impact affects the survivability of soldiers, despite not inflicting fatal injury to the human body. Therefore, an analytical model of the head and neck muscles are necessary. In this study, an analysis of human body injury using the previously developed head model, as well as a cervical model with muscles, was performed. For the quantitative prediction of injury, the stress, strain, and HIC were compared. The results from the model including the cervical system indicated a lower extent of injury than the results from the model excluding them. The results of head injury were compared with other references for reliability.

• Korean Journal of Construction Engineering and Management
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• v.14 no.3
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• pp.12-21
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• 2013

Total Project Cost Management System(TPCMS) was introduced with the purpose of increasing the efficiency of cost control for public construction project in 1994. In this paper, general perception of participants of the public construction project on the TPCMS was examined, and the problems in implementing the TPCMS was figured out through expert interviews and survey. Then better ways to implement the system were drawn based on the problems. To effectively manage the cost of public construction project, basically project cost should be estimated accurately in planning stage and managed based on it to have a project complete within the budget. In addition, the cost need to be managed in more systematic ways in terms of data collection and analysis, and the autonomy in managing the project cost given to the project owner needs to be expanded. Most of all, proper budget should be provided to prevent a project from delay through setting the priority of projects and proper budget allocation based on the priority.