• ETRI Journal
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• v.34 no.1
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• pp.142-145
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• 2012

The main challenge at present in constructing hierarchical identity-based encryption (HIBE) is to solve the trade-off between private-key size and ciphertext size. At least one private-key size or ciphertext size in the existing schemes must rely on the hierarchy depth. In this letter, a new hierarchical computing technique is introduced to HIBE. Unlike others, the proposed scheme, which consists of only two group elements, achieves constant-size private keys. In addition, the ciphertext consists of just three group elements, regardless of the hierarchy depth. To the best of our knowledge, it is the first efficient scheme where both ciphertexts and private keys achieve O(1)-size, which is the best trade-off between private-key size and ciphertext size at present. We also give the security proof in the selective-identity model.

• The Korean Journal of Health Service Management
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• v.11 no.3
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• pp.51-64
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• 2017

Objectives : This study examined the effect of private health insurance on medical care utilization by subscription type. Methods : The data used were the six waves of the Korea Health Panel (2009-2014), and 16,187 persons were the subjects of the analysis. We performed a panel regression with a fixed effects model. Results : Indemnity private health insurance was positively related to the number of physician visits, number of admissions, and total length of stays. However, fixed-benefit private health insurance was not related to medical care utilization. Conclusions : The result of this study, which shows the difference by subscription type in the effect of private health insurance on medical care utilization, suggests that continuous monitoring of indemnity private health insurance is needed in the future.

• Journal of Korean Society for Quality Management
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• v.42 no.3
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• pp.425-444
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• 2014

Purpose: This study aims to overcome the problem of private education market environment which is polarized into commercialized large private education institutions and small and medium sized private education institutions in a poor business environment, and develop systematic performance measurement model applicable for small and medium sized private education institutions. Methods: To develop the BSC which measures financial and non-financial indicator in a balanced manner and introduce the BSC into private education institutions that contain conflicting goals "EDUCATION" and "PROFIT". In particular, Utilizing the methodology of AHP, the priority of strategies and execution assignments are derived. Results: BSC model was developed and introduced by cooperating with executives of the private education institution. Moreover, the study permits to achieve the strategy, enterprise-wide vision and mission by deriving strategy map and applying it to the private education institution. To measure the performance of BSC model instruction, KPI corresponding to the strategic objectives of each perspective was derived. Conclusion: BSC model generally introduces to large-sized companies and public institutions. In this study, BSC model is developed by focusing on small and medium sized private institution. Furthermore, this study is more than simple model development, it makes a connection with achievement of strategic objectives, enterprise-wide vision and mission through strategy map and strategy execution method. Through the developed BSC model and strategy execution method, utilization plan in practice and customized model for private education institutions coexisting profit and non-profit objectives were developed, and academic implications were presented.

• The Korean Journal of Health Service Management
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• v.12 no.2
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• pp.27-38
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• 2018

Objectives : This study was conducted to examine the differences in the association of intellectual capital with organizational effectiveness of nursing organizations between public and private hospitals. Methods : A total of 166 nurses (82 of public hospital and 84 of private hospital) were recruited for the survey. Nurses' job satisfaction, organizational commitment, intellectual capital, sociodemographics, work-related factors, and health status were measured. Results : Nurses of public hospitals reported significantly higher scores in human capital, customer capital, job satisfaction, emotional engagement, and transactional commitments than did those of the private hospital. Human capital private and structural capital were significantly associated with nurses' job satisfaction in both public and private hospitals. Customer capital was positively associated with the emotional and transactional commitment in the public hospital, while, structural capital was associated with transactional and normative commitment in the private hospital. Conclusions : We could confirm that the nurses' intellectual capital is important the effectiveness of nursing organizations in both public and private hospitals.

• Journal of Korean Society of Archives and Records Management
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• v.17 no.1
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• pp.143-161
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• 2017

This research has been conducted under the premise that private records can supplement public records. It recognized that important records of a university could be supplemented with not only administrative records, but also with private records of persons related to the university. The analysis of the founders' life history research was used to establish the classification system of private records and collection strategies. The life history of the founders of the university was analyzed and utilized for the classification system of records and the construction of the collection strategy. This research proposes a multiclassification system with function, subject, and type as the criteria of the classification system, and uses keywords derived from the classification system as a starting point of searching for future record collection and deducing them as potential collectors and producers. Although it cannot be a standard for all private records, it can be considered a significant attempt that takes the diversity of private records into account.

• Korean Journal of Child Studies
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• v.37 no.2
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• pp.27-42
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• 2016

Objective: The purpose of this study was to examine the changes of childcare expenses and private education expenses caused by target expanding the childcare subsidy policy and its relationship to household income. Methods: The study analyzed data of the Korean Welfare Panel Study from 2009, before the universal childcare policy was enforced, to 2013, when the universal childcare policy was enforced. Results and Conclusion: The results of analysis were as follows. First, while childcare expenses, private education expenses, and their ratios to household income showed a tendency of gradual decline, the graphs of childcare and private education expenses were symmetric. Second, there were differences in childcare and private education expenses among income classes. Third, in 2009, before the universal childcare policy was enforced, household income affected childcare and private expenses. Lastly, in 2013, after the universal childcare policy was implemented, household income had a greater effect on private education expenses, while the effect of household income on childcare expenses became insignificant.

• Analyses & Alternatives
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• v.4 no.2
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• pp.39-70
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• 2020

This paper examines the changing roles of ownership in the economic growth by using a panel data set of 30 provinces in China for the period (1999-2010). With the use of absolute and relative presence variables, this study shows that private enterprises have emerged as the engine of economic growth in China in the later period (2005-2010). The growing size and number of private enterprises are positively linked to growth. However, though foreign-invested enterprises have been acclaimed as the main contributors to economic growth in China, they have minimal effect on the economic growth in the later period. State-owned enterprises have a significant and negative effect on the economic growth in the later period. The results can be interpreted that the engine of growth in China has been changed over time from other ownerships to private ownership. Private companies have developed a lot in every respect and started to lead the economy for long-run growth. China initiated its economic growth by adopting foreign capital and it is still the top destination for foreign direct investment among developing countries. However, to sustain the growth over a long period, private sector should be of great importance and perform a key role in the view of catch-up economics.

• Korean Journal of Human Ecology
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• v.20 no.6
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• pp.1199-1212
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• 2011

The purpose of this study is to examine how the mother's educational aspirations and household's characteristics have an effect on the likelihood of private educational expenditures and the amount of private educational expenditures. Factor analysis, probit and tobit analyses were used. The main findings can be summarized as the following: The mother's educational aspirations for intrinsic values is higher than for extrinsic values. The mother's educational aspirations for extrinsic values, household's assets, and residing in Seoul rather than residing in Incheon had significant positive effects on the likelihood of private educational expenditures. However, the child's birth order had a significant negative effect on the likelihood of private educational expenditures. The mother's educational aspirations for extrinsic values, the mother's education level, household's income, household's assets, and residing in Seoul rather than residing in Incheon had significant positive effects on the amount of private educational expenditures. However, the child's birth order had a significant negative effect on the amount of private educational expenditures. Findings from this study offer several implications. First, the mother's educational aspirations for extrinsic values rather than for intrinsic values has an effect on private educational expenditures. Unless the mother's educational aspirations have been changed to pursuing intrinsic values, the private educational expenditures cannot be reduced. Second, the polarization of the household's income and assets could bring about the polarization of private educational expenditures, which can lead to the intergenerational income polarization.

• International conference on construction engineering and project management
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• 2007.03a
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• pp.729-738
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• 2007

The Public Private Partnership/Private Finance Initiative (PPP/PFI) schemes have made the private sector become a major participant involved in the development of infrastructure systems along with the government. Due to more integrated efforts among project participants and longer concession period, PPP/PFI projects are inherently more complex and risky. It is therefore very important to proactively manage the risks involved throughout the project life cycle. Conventional risk management strategies sometimes ignore managerial flexibility in the planning and execution process. This paper starts with a revised risk management framework which incorporates the real option concept. Following the presentation of the framework, a new risk classification is proposed which leads to different ways of structuring options in a project according to the stage of the project life cycle. Finally, the paper closes by discussing other issues concerning option modeling and negotiation.

• Korean Security Journal
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• no.47
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• pp.139-165
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• 2016

In Mongolia, the regulation related to the private security industry, the Law on Contracted Private Security Services, was legislated relatively recently. The Law on Contracted Private Security Services was enacted into law in Mongolia 16 years ago, in 2000. This regulation has undergone two amendments since its inception. However, new revisions still need to be made to ensure that this regulation is in line with internationally accepted standards and practices. This paper compares the existing private security regulations of South Korea and Mongolia. The purpose of this comparative study was to identify the weaknesses of and problems in the Mongolian regulation and propose amendments to the Mongolian regulation. The comparative study of the two countries' regulations showed and underscored an imperative need to make further amendments to the Law on Contracted Private Security Services. Specifically, the weaknesses of and problems in the Mongolian regulation at issue include the following: the level of accuracy in defining certain legal terms and providing the proper names for various regulations; stipulations which set forth the procedure for registering a private security company; provisions regarding operating a private security company; the details of eligibility and accountability requirements concerning chief executives and security service officers; and the scope of work provisions. This study proposes constructive amendments to strengthen the Law on Contracted Private Security Services.