• Electronics and Telecommunications Trends
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• v.35 no.5
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• pp.139-150
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• 2020

Fifth-generation (5G) wireless communication supports low latency of up to 1 ms or less, 20 Gbps of data rate, and more than 1 million connections. With these technical advantages, machines and equipment can be precisely adjusted, allowing 5G to be applied to industrial applications. To expand the industrial application of 5G wireless communications, major countries have introduced dedicated 5G, allowing specific companies to build and use 5G directly. Germany, UK, and Japan allocate 100 MHz, 416 MHz, and 1,200 MHz, respectively, of bandwidth dedicated to 5G. Companies with local licenses from the government are expected to accelerate the application of 5G at a low cost and low-frequency range. Therefore, Korea should introduce private 5G to foster 5G-related industrial ecosystems and successfully implement the fourth industrial revolution.

• Korean Journal of Computational Design and Engineering
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• v.12 no.2
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• pp.95-100
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• 2007

Virtual Reality(VR) data in VR environments like Manufacturing industries are often created jointly by many creators. It is then necessary to provide protection of the joint-creatorship and the creatorship of each participating creator. This paper proposes Multiple Digital Watermarking Framework(MDWF) to solve the problem of joint-creatorship. The proposed framework, MDWF, makes use of 3D private watermarking technology and a novel key sharing protocol for joint-creatorship verification. MDWF embeds 3D private multiple watermarks for the creatorship of each participating creators in a non-overlapping manner during the creation process. After key agreement of all private keys, MDWF embeds an additional 3D private watermark for the joint-creatorship. Therefore MDWF successfully handles the creatorship dispute among creators. That is, each participation creator can prove his/her partial creatorship as well as joint-creatorship by MDWF. In addition, MDWF can solve the collusion problems because shared secret key(SSK) can be made by every users.

• Journal of Information Processing Systems
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• v.17 no.2
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• pp.284-296
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• 2021

The cloud has already become the core infrastructure of information systems, and government institutions are rapidly migrating information systems to the cloud. Government institutions in several countries use private clouds in their closed networks. However, because of the advantages of public clouds over private clouds, the demand for public clouds is increasing, and government institutions are expected to gradually switch to public clouds. When all data from government institutions are managed in the public cloud, the biggest concern for government institutions is the leakage of confidential data. The public-private-partnership (PPP) cloud provides a solution to this problem. PPP cloud is a form participation in a public cloud infrastructure and the building of a closed network data center. The PPP cloud prevents confidential data leakage and leverages the benefits of the public cloud to build a cloud quickly and easily maintain the cloud. In this paper, based on the case of the PPP cloud applied to the Korean government, the concept, architecture, operation model, and contract method of the PPP cloud are presented.

• The Korean Journal of Applied Statistics
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• v.27 no.7
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• pp.1125-1137
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• 2014

This paper studies what affects the private education cost for the elementary, middle, and high school students. It is a big issue now because there can be a problem in the equal opportunity for education if the portion of private education cost is very high in the total education cost. If we spend more time and money on the private education than the school education, it can cause the polarization among the classes and regions. The excessive private education also can deteriorate the school system. we use various regression and classification methods to analyze the cost of private education and find the important variables in the models. we found that large cities spend more money on the private education than small cities. We also found that high school students spend more than middle school students and the elementary students and the household with more income spend more money on the private education.

• Journal of KIISE:Computing Practices and Letters
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• v.14 no.4
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• pp.446-450
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• 2008

Private Matching is the problem of computing the intersection of private datasets of two parties without revealing their own datasets. Freedman et al.[1] introduced a solution for the problem, where only one party gets private matching. When both parties want to get private matching simultaneously, we can consider the use of Kissner and Song[2]'s method which is a privacy-preserving set intersection with group decryption in multi-party case. In this paper we propose new protocols for fair private matching. Instead of group decryption we introduce a Semi-Trusted Third Party for fairness. We also propose an update procedure without restarting the PM protocol.

• Korea Journal of Hospital Management
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• v.24 no.1
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• pp.48-56
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• 2019

Purpose: As an interest in the elderly medical expenses increases, elderly people are increasingly purchasing indemnity private health insurance. Authors tried to investigate factors of having the indemnity private health insurance among the elderly people aged 65-75 years. Methods: We conducted panel logit regression analysis on 2,465 subjects as of 2016 using Korean Health Panel from 2010 to 2016. The dependent variable was whether to enroll in the indemnity private health insurance. The explanatory variables included socio-demographic characteristics, economic factors, health status, and health behaviors. Findings: As a result of the analysis of factors of purchasing indemnity private health insurances, it was analyzed that people with larger family, educated, pensioner, high household income or no disability were more likely to have indemnity private health insurance. Practical Implications: Considering the results of this study, the factor of purchasing indemnity private health insurance among elderly people were more likely to be their economic than demographic characteristics such as sex, age, and marital status. Policy makers should make efforts to reduce the burden on the elderly medical expense and to improve equity of medical use through institutional improvement such as raising age limit and lowering premium of indemnity private health insurance and expansion of public health insurance.

• Asia Marketing Journal
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• v.6 no.2
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• pp.3-22
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• 2004

Prior researches related to private brands have mainly focused on the competition between private brands and national brands. But private brands can be allied with national brands to overcome its weak points such as low perceived quality. The purpose of this study is to investigate the consumer responses to the alliance between private brands and national brands. Especially this paper focused on the situation in which national brands are used as ingredient brands to improve the consumers' preference toward private brands. We hypothesized that using national brands as ingredient brands would improved the consumers' perceived quality and buying intention toward private brands. Also we supposed that when national brands had moderate congruity with product category, consumers' preference would be most positive. And this study examined the moderating effects of functional risk. Factorial experimental design and scenario method were employed to test the hypotheses. Also we classified the products as utilitarian-hedonic products and compared the effects of ingredient brands on utilitarian products with hedonic products. Empirical results show that when private brands use national brands as ingredient brands, consumer responses become positive. Also when ingredient brands have moderate congruity with products, consumer responses are most positive. But moderate congruity effect is significant only when functional risk is low.

• Journal of the Economic Geographical Society of Korea
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• v.26 no.2
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• pp.137-154
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• 2023

The purpose of this study is to find ways to utilize public-private partnerships from the perspective of governance in order to effectively promote urban regeneration projects and establish a business structure. The results of the study are summarized as follows. First, from the perspective of governance, the types of public-private partnerships in urban regeneration projects can be classified into central government-led, local government-led, private business-led, and local residents and community organizations-led. Second, it is confirmed through overseas case analysis that developed countries are effectively promoting urban regeneration projects through the formation of various public-private partnerships. Third, as a way to utilize public-private partnerships in Korean urban regeneration projects, it was proposed to diversify the types and size of urban regeneration projects, design a system to utilize various public-private partnerships, use cross-assistance methods, and form social capital necessary for transparent and effective private partnerships.

• The Journal of the Korea Contents Association
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• v.17 no.6
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• pp.32-38
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• 2017

Despite the opinion that certificate is useless, half of the population in Korea (approx. 35 million) get an certificate, and use it for internet banking, internet shopping, stock trading, and so on. Most users store their certificates on a usb memory or smartphone, and certificates or passwords stored on such storage media can be easily attacked and used to disguise as legitimate users. Due to these security problem of certificate, a various authentication technologies has been proposed such as smartphone owner authentication using SMS, and a personal authentication using biometric authentication. However, a safe technique is not presented yet without user password, and certificate. In this paper, I proposed a method to secure certificate/private key without a user password using a combination of USIM card and smartphone's information. Even if a hacker gets the user password, the certificate, and the private key, he can not use the certificate. User do not need to remember complex password which is a combination of alphabetic / numeric / special characters, and use his certificate safely.

• Journal of the Korean housing association
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• v.11 no.2
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• pp.85-95
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• 2000

This study tries to promote an effective use of semi-public space of urban street in social point of view. The main results are follows. First, semi-public space is occupied by private users and it makes urban landscape unrecoverable. The real problem is that people do not know the space is for public use rather than pure private use. Second, the standard of semi-public space requirement should be changed from floor space to lot area. In addition, the standard should apply to buildings on an area less than a legal standard. Third, some ways of attaining the semi-public space in relation with adjacent lots should be introduced in the case of urban redevelopment nad living condition improvement projects.