• Korean Journal of Adult Nursing
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• v.13 no.1
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• pp.70-81
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• 2001

The relationships among self efficacy, depression and coping with cancer were examined in 194 outpatients who had received a diagnosis of cancer. The sample for this descriptive correlational study consisted of people who were at least 19 years old and had been treated for cancer at 6 hospital in Seoul. Data were collected using a self-report questionnaire. The results of this study are as follows: 1. People who attributed cancer to heredity/family showed the highest mean score of self efficacy. People who attributed cancer to smoking showed the highest mean score of depression. and coping. 2. There were significant differences between causal attribution and depression and between causal attribution and coping. 3. There was a negative correlation between self-efficacy and depression(r=-.301, p= .000), whereas there was a positive correlation between self-efficacy and coping (r=.195, 0=.006). Finally, it is evident that identifying clear perceived causes, self-efficacy, depression and coping in patients with cancer continues to challenge researchers. Based upon this study, it is recommended that future research have a longitudinal design that allows for the identification of changes in perception, emotion and coping and, possibly, different relationships over time.

• Journal of Labour Economics
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• v.32 no.3
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• pp.27-59
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• 2009

Using Korea Education Longitudinal Study and administrative school data, this paper analyzes school characteristics that influence the demand for private education. Among other findings, it should be noted that private education expenditure tends to be decreased when student evaluation of teacher effectiveness is high, the average education level of teachers is high, and individualized education is offered through subject-based classroom. These results suggest that the demand for private education could be dropped by a better quality and high effort of teachers, which would be attained through an improved education system for teaching profession and student-oriented teacher evaluation. In addition, ability grouping within school via subject-based classrooms with different levels appears to be helpful to overcome uniformity of school equalization system without inducing an increasing demand for private education.

• Maxillofacial Plastic and Reconstructive Surgery
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• v.36 no.4
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• pp.135-139
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• 2014

Purpose: We review published research on temporomandibular joint (TMJ) total replacement that compares costochondral graft and customized total joint reconstruction (especially TMJ concepts), focusing on effectiveness. Methods: We searched PubMed databases, including prospective, retrospective, case-control or longitudinal studies and significant statistical analysis. In data analysis, we divided outcomes into 'Acceptable' or 'Non-acceptable'. Results: There were seven articles found dealing with costochondral graft and 180 patients. The majority of patients had satisfactory treatment outcomes (n=109, 61%). There were six articles including 275 patients using the alloplastic material TMJ concepts. Almost all patients had satisfactory treatment outcomes (n=261, 95%). Conclusion: Comparing customized total joint reconstruction with costochondral graft, use of TMJ concepts resulted in increased quality of life and fewer complications. In conclusion, we judged that alloplastic material such as TMJ concepts is more effective device in total joint replacement than costochondral graft.

• Journal of Korean Academy of Nursing
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• v.37 no.3
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• pp.324-333
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• 2007

Purpose: The purpose of this study was to develop and evaluate a quality of life scale for Korean patients with cancer (C-QOL). Methods: The C-QOL was developed and validated as follows, item generation, pilot study, and psychometric tests. A total of 337 patients diagnosed with stomach, liver, lung, colon, breast, or cervix cancer were recruited. The patients were asked to complete the preliminary questionnaire comprising the content-validated items, the SF-36, and the ECOG performance status. The obtained data was analyzed using descriptive statistics, factor analysis, multidimensional scaling (MDS), multitrait/multi-item matrix, ANOVA, t-test, and Cronbach's alpha. Results: Preliminarily twenty-six items were generated through content validity and a pilot study. Factor analysis and MDS extracted a total of 21 items with a 5-point Likert-type scale (C-QOL). The C-QOL included five subscales: physical status (6 items), emotional status (6 items), social function (3 items), concern status (2 items), and coping function (4 items). The C-QOL established content validity, construct validity, item convergent and discriminant validity, known-groups validity, reliability, and sensitivity. Conclusion: The Newly developed C-QOL is an easily applicable instrument which established psychometric properties and reflected Korean culture. It is recommended for further study to examine the responsiveness of the C-QOL using a longitudinal research design.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.24 no.7 s.178
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• pp.1871-1877
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• 2000

Longitudinal and lateral forces acting at tire are known to be closely related to the tractive ability, braking characteristics, handling stability and maneuverability of ground vehicles. However, it is not feasible in the operating vehicles to measure the tire forces directly because of high cost of sensors, limitations in sensor technology, interference with the tire rotation and harsh environment. In this paper, in order to develop tire force monitoring system, a new vehicle dynamics monitoring model is proposed including the roll motion. Based on the monitoring model, tire force monitoring system is designed to estimate the lateral tire force acting at each tire. A newly proposed SKFMEC (Scaled Kalman Filter with Model Emr Compensator) method is developed utilizing the conventional EKF (Extended Kalman Filter) method. Tire force estimation performance of the SKFMEC method is evaluated in the Matlab simulations where true tire force data is generated from a 14 DOF vehicle model with a combined-slip Magic Formula tire model.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.11
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• pp.5434-5441
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• 2013

Using longitudinal data of 575 sample from 122 firms in large business conglomerates from 2001 to 2008, this study examines the impact of controlling shareholders' control-ownership disparity on executive compensation. The empirical study finds that controlling shareholders' control-ownership disparity is negatively related to the level of executive compensation and moderate negatively the relation between firm performance and executive compensation. This finding suggests that controlling shareholders' control rights in excess of ownership rights lead to decreased executive compensation in order to relieve the concerns of stakeholder about the potential agency costs of controlling shareholder, and have, on the other hand, entrenchment effects on the decision of executive compensation by decreasing its sensitivity on firm performance.

• Journal of Labour Economics
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• v.24 no.1
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• pp.177-205
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• 2001

This study investigates a long-tenn effect of labor career during middle life on the retirement process and income status later in life course. Two waves of KLIPS (Korean Labor Longitudinal Panel Survey) data sets collected in 1998 and 1999, are employed, which include detailed information on economic activities among those aged 15 and over. Results show that temporary, contracted workers during middle life not only have higher risk of job loss and poverty than those in permanent work status but also they are more likely to experience a stressful retirement process later in life course.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.30 no.10 s.253
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• pp.966-972
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• 2006

A numerical simulation is performed fur developing turbulent flow in a strongly curved 180 deg pipe and its downstream tangent by a new solution code(PowerCFD) which adopts an unstructured cell-centered method. The governing equations are discretized as the full elliptic from of the equations of motion. Three typical two-equation turbulence models of low-Reynolds-number form are used to approximate the turbulent stress field. Solutions fur both streamwise and circumferential velocity components are compared with the experimental data by Azzola et at.(1986). The ${\kappa}-{\omega}$ model by Wilcox(1988) is found to give better prediction performance than the other two. Predicted secondary velocities and streamwise velocity component contours at sequential longitudinal stations are also presented in order to enable a detailed description of the complete flow. It is also found that, in the bend both mean streamwise and secondary velocities never achieve a fully-developed state and the code is capable of producing very well the complex nature of steady flow in a strongly curved pipe.

• Journal of Preventive Medicine and Public Health
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• v.41 no.3
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• pp.200-207
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• 2008

Objectives : This study examined whether serious psychological distress (SPD) is associated with occupational injury among US employees. Methods : The employed population aged 18-64 years was examined (n=101,855) using data from the National Health Interview Survey (NHIS) 2000-2003. SPD was measured using the Kessler 6-item Psychological Distress Scale (K-6), a screening scale designed to identify persons with serious mental illness. The predicted marginal prevalence of psychological distress and occupational injury with the adjusted odds ratio were estimated using multiple logistic regression analyses. Results : The age-adjusted 3-month prevalence of occupational injury was $0.80{\pm}0.12%$ in workers with SPD, which was 37% greater than in workers without SPD ($0.58{\pm}0.03%$). The odds of occupational injury in workers with SPD were higher compared to workers without SPD (OR=1.34, 95% CI=0.93-1.92), after controlling for sex, age, race, education, occupation, and activity limitation by at least one medical condition. Male, service and blue collar occupation, and activity limiation by co-morbidity showed significantly higher odds of occupational injury for workers with SPD. Conclusions : The findings suggest that SPD accounts for an increased likelihood of occupational injury among US employees. A further longitudinal study is needed to differentiate the mechanism or causal pathways linking individual injury risk at the workplace, SPD, and socioeconomic factors.

• Journal of Korean Society for Quality Management
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• v.44 no.3
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• pp.617-638
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• 2016

Purpose: The purpose of this study is to propose useful suggestions by analyzing difference of financial performance between "Excellent Quality Competitiveness Enterprise(EQCE)" awarding companies and all the manufacturing companies during the period 2003-2014 and by testing the moderating effects of performance year. Methods: This paper perform the longitudinal study during the period 2003-2014. The collected data through list of National Quality Award and financial report of CRETOP were analyzed using independent-sample t-test, paired-sample t-test, one way ANOVA and empirical analysis. Results: The results of this study are as follows; EQCE showed higher growth rate than all the companies until 2008, but profitability, stability, and activity are not significantly different between the both. Therefore EQCE have partial influences on growth rate among several financial performance measures until 2008. Since 2009 there are no differences. The effects of EQCE on financial performance are different by the year. Conclusion: EQCE award system was a meaningful promotion method to enhance good financial performance through encouraging quality management for the manufacturing companies until 2008, But since 2009 it is expected to lose its role as a promoting tool for quality management and performance excellence. Therefore new way of thinking for EQCE, as a national quality award system, is necessary; changing awarding system, award criteria, or etc.