• Korea Journal of Hospital Management
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• v.25 no.4
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• pp.48-59
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• 2020

Purposes: The purposes of this study is analysis of business performance in national university hospitals in Korea. Methodology: Data from 2010 to 2019 were collected from balance sheet, income statement, and annual reports in 11 national university hospitals. The dependant variables are business performance which are operating margin to total assets, operating margin to gross revenue, and net income to gross revenue. The independent variables are the number of bed, hospital location, opening, liquidity, stability, and activity. Findings: In recent years, activity has been shown to have a lot of influence on management performance. National university hospitals increase profitability by using resources as efficiently as possible. The short-term debt and fixed assets have been increased rapidly in recent years. It was found that management performance has been increased through active investment using financial leverage. Practical Implications: Based on these results, this study will be the basic data for efficient management of national university hospitals.

• Korean Journal of Organic Agriculture
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• v.30 no.4
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• pp.471-483
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• 2022

This study analyzed management situations of two organizations that have produced environment-friendly agricultural and processed meat products. 'A' farming corporation sells environment-friendly agricultural products like as grains, vegetables, fruits and processing foods. 'B' agricultural corporation processes and sells environment-friendly processed meat products, specially organic and antibiotic-free beef products. Recently, members and production areas of 'A' farming corporation have decreased because of their aging and labor shortage. And Indices for the management analysis are stability ratio, activity ratio and profitability ratio. Stability ratio indices are debt ratio, net worth ratio, fixed ratio and current ratio. Activity ratio ones include fixed assets turnover and net worth turnover. And profitability ratio is showed through return on investment, net return on sales and return on equity.

• Journal of Communications and Networks
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• v.5 no.3
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• pp.275-281
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• 2003

Random Early Detection (RED) [1] is an active queue management scheme which has been deployed extensively to reduce packet loss during congestion. Although RED can improve loss rates, its performance depends severely on the tuning of its operating parameters. The idea of adaptively varying RED parameters to suit the network conditions has been investigated in [2], where the maximum packet dropping probability $max_p$ has been varied. This paper focuses on adaptively varying the queue weight $\omega_q$ in conjunction with $max_p$ to improve the performance. We propose two algorithms viz., $\omega_q$-thresh and $\omega_q$-ewma to adaptively vary $\omega_q$. The performance is measured in terms of the packet loss percentage, link utilization and stability of the instantaneous queue length. We demonstrate that varying $\omega_q$ and $max_p$ together results in an overall improvement in loss percentage and queue stability, while maintaining the same link utilization. We also show that $max_p$ has a greater influence on loss percentage and queue stability as compared to $\omega_q$, and that varying $\omega_q$ has a positive influence on link utilization.

• Korean Journal of Construction Engineering and Management
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• v.9 no.6
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• pp.164-174
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• 2008

As buildings become larger, higher and more complex in most construction sites, construction projects have to deal with transportation of more materials, labor and equipment, necessitating more use of construction equipment. Notably, in the high-rise building and plant construction projects mobile cranes are adopted more frequently among different types of construction machinery, which also results in serious industrial accidents relating to the use of crane. To reduce serious industrial accidents involving cranes, researches on its stability is in need. The research herein aims to study how to select sling and lug of mobile crane and review its stability. The research outcomes herein will make considerable contributions to selecting mobile cranes efficiently and ensuring their stability.

• Journal of Mechanical Science and Technology
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• v.20 no.11
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• pp.1898-1913
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• 2006

This paper deals with the design of a yaw rate controller based on gain-scheduled H$\infty$ optimal control, which is intended to maintain the lateral stability of a vehicle. Uncertain factors such as vehicle mass and cornering stiffness in the vehicle yaw rate dynamics naturally call for the robustness of the feedback controller and thus H$\infty$ optimization technique is applied to synthesize a controller with guaranteed robust stability and performance against the model uncertainty. In the implementation stage, the feed-forward yaw moment by driver's steer input is estimated by the disturbance observer in order to determine the accurate compensatory moment. Finally, HILS results indicate that the proposed yaw rate controller can satisfactorily improve the lateral stability of an automobile.

• Journal of the Korean Operations Research and Management Science Society
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• v.24 no.2
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• pp.109-119
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• 1999

The average shadow price is a substitute for the traditional marginal shadow price. It can serve as a standard for decision making problems about the economic resources where the marginal analysis gives no useful information. This paper treats the average shadow price in pure integer programming and shows some stability properties of it. This implies that the values of the average shadow prices once computed are reliable within some extent of the data perturbations of the integer programming model.

• Management Science and Financial Engineering
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• v.18 no.1
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• pp.49-53
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• 2012

A novel method of transient stability analysis is presented in this paper. The proposed method extracts data points near the basin-of-attraction boundary and then builds a support vector machine (SVM) model learned from the generated data. The constructed SVM classifier has been shown to reduce dramatically the conservativeness of the estimated basin of attraction.

• Journal of Family Resource Management and Policy Review
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• v.22 no.4
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• pp.17-32
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• 2018

The purpose of this study was to explore the effects of family life stress and family values on marital stability among middle-aged couples. The subjects included a total of 302 men and women aged 45-64 who had been married for more than 20 years and were living in Seoul. The collected data were statistically analyzed with the SPSS 21.0 Package. First, Cronbach's alpha was calculated to measure the reliability of the scale that assessed the variables of the research model. Then, mean and standard deviation were calculated to determine the degrees of family life stress, family values, and marital stability among the subjects. Finally, a hierarchical multiple regression analysis was performed to identify factors that affected the subjects' marital stability. The results revealed that the level of family life stress in middle-aged married men and women was slightly higher than the mean value. Of all the sub-scales of family life stress, the subjects were found to experience the most stress from factors related to financial pressure, followed by family relationships, a sense of loss within a family, and work-family compatibility. Therefore, financial problems were one of the critical stressors for middle-aged married couples. Also, for this demographic, the levels of family values and marital stability were higher than the medians. The factors affecting marital stability in middle-aged couples were identified to be family relationship stress, financial stress, subjective economic status, family values, stress related to work-familycompatibility,religion,andage.Thedegreeofmaritalstabilitywashigherinmiddle-agedcouplesa stheirstresslevelsfromfamilyrelationshipsandfinancialproblemswerelower.Moreover,thehigherthes ubjectiveeconomicstatusandthemoretraditionalthefamilyvalues,thehigherthedegreeofmaritalstabili ty.Finally,marriedcoupleswhowerereligioushadalowerlevelofstressfromwork-family compatibility, and the younger the couples, the higher the degree of marital stability.

• Journal of Families and Better Life
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• v.5 no.2
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• pp.83-97
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• 1987

The objected of this study were to investigate how social class system influences family life, especially, marital relationship through area of marital satisfaction and marital stability and to find out influences of variables related to marital stability, that is, marital satisfaction, marital alternatives and barriers to marital breakup. The study was performed in a viewpoint of social exchange approach. Major findings were as follows; First, husbands and wive's marital satisfaction and marital stability differed significantly by their level of SES. The marital satisfaction scores and the marital stability score of higher class were higher than those of lower class. second, the higher the marital satisfaction scores and the barriers to marital breakup scores were, the higher the marital stability scores were. And the higher the marital alternatives scores were, the loser the marital stability scores were. Third, the independent influences of variables related to marital stability were differed by level of SES. The last, the typology of marital satisfaction and marital stability differed by level of SES. In lower class, the marriage type of low satisfaction and low stability is more than other types. But in middle and upper class, the most marriage type is high satisfaction and high stability marriage.

• The Korean Journal of Health Service Management
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• v.9 no.3
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• pp.13-30
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• 2015

Objectives : The aim of this study was to investigate changes in job satisfaction of hospital workers according to different occupations at a university hospital in Seoul. Methods : A survey questionnaire was sent out to people working in a University Hospital in Seoul. Four hundred questionnaires were included in the final analysis. Results : The results of this study are as follows. Sense of accomplishment was a significant job satisfaction factor resulting in a high level of satisfaction. Work environment, compensation and job stability also affected job satisfaction; however, satisfaction levels appeared to be relatively low. Conclusions : When looking at the most important factors among the influencing factors that the members of the organization thought were most important for job satisfaction, the results showed that achievement, work environment, job stability and compensation were important factors.