• Human Ecology Research
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• v.56 no.5
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• pp.461-472
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• 2018

Using a sample of third grade middle school students from the forth wave of Children and Youth Panel Survey in 2012, the mediation effects of private educational expenditure between parenting styles and children's academic performance were investigated by applying factor, cluster, tobit, and two stage regression analysis. The major results were as follows. First, four types of parenting style were identified. The most frequent parenting style was ambivalent parenting (tiger parenting) which was followed by authoritative parenting. Second, compared to permissive parenting style, ambivalent, authoritative, and authoritarian parenting styles were significantly associated with more private educational expenditures. Third, more private educational expenditures were significantly associated with higher academic performance of children. I found both a full mediation effect of private educational expenditure for ambivalent and authoritarian parenting styles, and a partial mediation effect for authoritative parents. Authoritative parenting style has a negative moderating effect on the relationship between household income and private educational expenditure, along with a positive direct effect on the academic performance of children. The results suggested that an authoritative parenting style was related with higher academic performance of children with less private educational expenditures compared to other parenting styles. The results also implied that the public policies to enhance authoritative parenting style among parents would be effective to reduce household's private educational expenditures.

• Convergence Security Journal
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• v.13 no.5
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• pp.207-213
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• 2013

As the axis of the private security maintain social order in order to achieve the original purpose of all society must move in the direction of motion, and so in order to be a private security based philosophical values and ideological composition should be based. In this process, to be followed by private security value or direction, philosophy private security is the norm. In this regard, this study pursued by the private security justification ever truly normative principles are intended to establish. The public nature of the ideology of private security, public, efficiency, legality, responsiveness and the like. Conflict occurs between the value of these ideals, although complementary are in harmony.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.14 no.3
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• pp.1280-1300
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• 2020

In the modern financial sector, interest in providing financial services that employ blockchain technology has increased. Blockchain technology is efficient and can operate without a trusted party to store all transaction information; additionally, it provides transparency and prevents the tampering of transaction information. However, new security threats can occur because blockchain technology shares all the transaction information. Furthermore, studies have reported that the private keys of users who use the same signature value two or more times can be recovered. Because private keys of blockchain identify users, private key leaks can result in attackers stealing the ownership rights to users' property. Therefore, as more financial services use blockchain technology, actions to counteract the threat of private key recovery must be continually investigated. Private key recovery studies are presented here. Based on these studies, duplicated signatures generated by blockchain users are defined. Additionally, scenarios that generate and use duplicated signatures are applied in an actual bitcoin environment to demonstrate that actual bitcoin users' private keys can be recovered.

• KDI Journal of Economic Policy
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• v.38 no.2
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• pp.21-44
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• 2016

There has been a surge of interest in private equity as an alternative corporate restructuring scheme to complement the current institutional forms such as workouts and court receivership. By empirically examining whether private equity in Korea can improve investee companies, we find that while private equity in Korea did not sacrifice the long-term growth potential of investee firms, it did not improve their profitability (e.g. ROA, ROE, and ROS) or growth (e.g. sales growth) either. Both the negative correlation between business performance and firm age and our empirical results showing that young firms were favored by private equity for investment imply that Korean private equity may perform as growth capital, similar to venture capital rather than as buyouts for corporate restructuring.

• Korean Security Journal
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• no.21
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• pp.135-154
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• 2009

For the introduction of domestic private investigation act, with beginning of private investigation act bill by Ha Soon-bong in 1999, congressmen Choi Jae-chun, Lee Sang-bae, in 2005, Lee In-gi in 2008, and Kang Sung-chun in 2009 initiate the each bill, and many researches and studies in the academia about the private investigation act bill makes have a bright prospect toward to the bill. However, up to the present, there is a debating which services will charge for management for the private investigation business. It is important that which facilities will assume charge of management for the private investigation business because this is a cornerstone to set up a successful investigation act which fulfills a nation's needs in the future. According to the other countries which induced the act earlier, they, by perceiving the act as a part of the private security, manage the act by setting the police or the separate services such as committees. In municipal laws, there was a case suggesting The National Police Agency and The Justice Department as the facilities for the management and supervision, however, for the unification of administration for the whole private security, similarities of the private investigation and police service, privacy of police services, and development for the domestic private security business, the national police agency, taking care of the private security business, should be assigned as the department for management and supervision, additionally, suggestion to establish "The Management Committee for Private Investigation Business" as a separate facility under the national police agency is needed.

• Journal of the Korean Operations Research and Management Science Society
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• v.37 no.4
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• pp.1-18
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• 2012

With the enormous growth and various applications of private brands, national brand manufacturers are confronted with a dilemmatic situation. That is, paradoxically, some manufacturers have come to produce private brands of retailers which are potential competitors to their own brands. This study reveals why manufacturers with their own brands let themselves do the consignment production of retailers' private brands although those private brands may become strong competitors of their own brands and then investigates the condition in which manufacturers may benefit from such consignment production. Through an analysis of a game theoretical model assuming a monopoly market, the present study presents the theoretical backgrounds and provides new insights about consignment production of manufacturer with its own brand for retailer's private brand. First, such consignment production can play a role in mitigating the loss in the consignee manufacturer's own brand sales caused by the private brand in the competitive environment. Second, the effectiveness of such role is affected by the quality of the private brand produced under consignment. In other word, only if the consignee manufacturer keeps the quality of the private brand low, the manufacturer can maintain the benefit from its own brand. In addition, a consigner retailer needs to consider the final objective of launching its private brand, when it chooses its consignee manufacturer of the brand. Finally, a manufacturer with its own brand may consider consignment production as not merely an unavoidable option compelled by a retailer's power but a reasonable strategic choice to reduce the risk from competition.

• Journal of Digital Contents Society
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• v.10 no.3
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• pp.401-411
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• 2009

This study focused on the crisis of local private broadcasting and political solution. The local private broadcasting has launched in 1995. Until now, local private broadcasting is successful in stable management and ensuring profit but it is attributed to a role of transmission pipe of SBS. However, this kind of syndication system has been a major problem of local private broadcasting and local private broadcasting has become weak and weak from outside impact. Presently broadcasting market has been changed very fast. It enters into unlimited competition era of multimedia and multichannel. However, especially local private broadcasting has both of public and private characteristics. Thus, local private broadcasting should not be hung by the wall any more. In this study administrative outcome of local private broadcasting will be analyzed and some hot political issues will be analyzed also then the political solution might be looked up at the same time. Now local private broadcasting also should be changed to totally new broadcasting company pursuing creative local contents and new digital concept.

• Health Policy and Management
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• v.32 no.2
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• pp.137-153
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• 2022

In the process of promoting policies to strengthen health insurance coverage, the relationship between public health insurance and private health insurance, along with the management of non-benefit, is also emphasized as a policy issue. First, the concept and scope of non-benefit were comparatively analyzed by country. Second, the interaction between the public and private health insurance was classified as 'large or small,' and the government's regulation and management policy on private health insurance was classified as 'strong or weak.' Korea has relatively smaller benefits covered by public health insurance, higher copayment expenses, and more areas and scope of non-benefits. In countries where the interaction between public and private health insurance is small, private health insurance-related policies are weak. And in countries with large interactions had public-private partnerships and the government's management policies were also strong. On the other hand, Korea has a large interaction, but the actual structure of cooperation between public and private insurance and management policies were weak. Because the non-benefit sector in Korea is relatively wide, it is difficult to manage compared to other countries where the concept of non-benefit is limited. In addition, the health authorities rarely perform the role of supervision over private health insurance, and they have so few linkages and cooperation for public-private insurance. Therefore, practical policy enforcement is necessary to achieve the easing of the burden of national medical expenses through linkage and cooperation of public-private health insurance with reference to relevant other countries' cases.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.16 no.6
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• pp.2074-2093
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• 2022

RSA is known as one of the best techniques for securing secret information across an unsecured network. The private key which is one of private parameters is the aim for attackers. However, it is exceedingly impossible to derive this value without disclosing all unknown parameters. In fact, many methods to recover the private key were proposed, the performance of each algorithm is acceptable for the different cases. For example, Wiener's attack is extremely efficient when the private key is very small. On the other hand, Fermat's factoring can quickly break RSA when the difference between two large prime factors of the modulus is relatively small. In general, if all private parameters are not disclosed, attackers will be able to confirm that the private key is unquestionably inside the scope [3, n - 2], where n is the modulus. However, this scope has already been reduced by increasing the greatest lower bound to [d_il, n - 2], where d_il ≥ 3. The aim of this paper is to decrease the least upper bound to narrow the scope that the private key will remain within this boundary. After finishing the proposed method, the new scope of the private key can be allocated as [d_il, d_ir], where d_ir ≤ n - 2. In fact, if the private key is extremely close to the new greatest lower bound, it can be retrieved quickly by performing a brute force attack, in which d_ir is decreased until it is equal to the private key. The experimental results indicate that the proposed method is extremely effective when the difference between prime factors is close to each other and one of two following requirement holds: the first condition is that the multiplier of Euler totient function is very close to the public key's small value whereas the second condition is that the public key should be large whenever the multiplier is far enough.

• Korean Security Journal
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• no.59
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• pp.189-215
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• 2019

As modern society has become specialised and complex in all areas of politics, economy and society, it has reached a point where it is difficult to control crime with the general public power. Private security, which began to fluctuate after the 19th century, has expanded its scope to subsidise public power in various areas, sometimes beyond public power. Among these private security activities, the private investigate system has long been used to provide private investigate services that are safe from personal human rights protection and crimes. This study investigate the private investigation system in the United Kingdom and South Korea focusing on the missing person investigation system by using the qualitative content analysis of research methods. First, the results of the qualitative content analysis are described through methods such as literature reviews and interviews on how the British private investigation system and the missing persons search system are implemented. Next, the results of the content analysis are presented through the methods of literature reviews and questionnaires on how the implementation of the civilian survey in Korea and the search for missing people is proceeding. It is a very important field in both countries, and there is a very limited study, especially from a Korean perspective. Therefore, it is expected that this study will not only facilitate discussions for the successful legalisation of the private research system, but also provides a basic foundation for future research. The study of the private research system should be ongoing and periodic, not temporary. In addition, in order to introduce Korea's private survey system, the private investigation system should be developed by discovering the problems of the Private Investigation Law mentioned in this study and collecting opinions from citizens, academics and related institutions. The introduction of the private investigation system requires the connection of the efforts and interests of citizens, academia and related institutions.