• KSII Transactions on Internet and Information Systems (TIIS)
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• 제14권3호
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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.

• 대한가정학회지
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• 제42권8호
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• pp.65-76
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• 2004

The purpose of this study is to offer essential information related to early childhood education and care policy. Using the Korea Labor and Income Panel Study(KLIPS) Vol.5., this study analyzed sociodemographic factors that decide the use and type of institute for early childhood education and care. The following results are obtained： First, it is not easy for young children under three years old to use education and care institutes because of their preference for home care. Second, the mother's job status affects the child's use of child care centers and private institutes for education except for the using of early child education centers. Third, the affecting main factors for the use of child care centers are quite similar to critical factors for use of the private institute for education. Thus, young children using the private institute for education could be interpreted as coming from a low-income class compared with the children using the early child education centers.

• 한국디지털건축인테리어학회논문집
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• 제10권1호
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• pp.31-38
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• 2010

The use of school should not be limited to student education any longer but be extended for attaining social benefits. For this reason, school should play central roles not only in education but also in childcare, welfare, culture, physical education, etc. In order for school to accommodate various new functions, it is essential to promote the mixed-uses of school facilities, and this process requires the involvement of private capitals for early achievement of social benefits from school facilities. Thus, this study purposed to examine the necessity of the multiple uses of school facilities through the investment of private capitals, to diagnose the adequacy of build-transfer-lease (BTL) applied currently to the multiple uses of school facilities, and to find obstacles to the activation of private sector investment and suggest solutions for the obstacles. In particular, this study aimed at proposing plans to enhance the efficiency of private sector investment and activate private sector investment projects by suggesting how to promote the multiple uses of school facilities in consideration of profitability for private investors.

• 한국재난정보학회 논문집
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• 제7권2호
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• pp.130-139
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• 2011

이 논문에서는 인간정보 역할의 중요성이 제기되고 있는 상황에서 테러방지를 위한 보완책으로 민간경비와의 적용성을 검토하였다. 국가중요시설과 교통수단 그리고 다중이용시설에서 민간경비의 적용성을 검토한 결과, 민 관간의 협력체결을 통한 지속적인 위탁교육실시와 민간 무장경비요원의 선박탑승을 위한 법제정 마련, 민간경비원의 탐지견 활용과 지하철 역사의 민간경비요원 대체 방안, 관계기관의 시설주에 대한 지도 감독체계와 시설주의 테러대응 방안의 인식 전환을 위한 산 관의 적극적인 홍보가 필요하다.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2005년도 춘계학술대회논문집
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• pp.394-397
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• 2005

In korea, the power consumption is increasing every year because of economic growth, requiring of convenience and delightfulness condition. As increasing power consumption, Private Use is steadily increasing and the rate of electrical accident is increasing. Therefore we research the electrical safety culture of our people by the survey of electrical safety. The subject to investigation is possessor, occupier of Private Use and electrical safety manager. This paper will be used to base data for the protection of electrical accident and facility accident at Private Use

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2003년도 하계학술대회 논문집 Vol.4 No.2
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• pp.1180-1183
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• 2003

170kV GIS(Gas Insulated Switchgear) is widely used in large industrial factory-electrical facilities of private use because has many benefits. But Other equipments's failures are occurred by GIS failures and give rise economic problems to user. Therefore we will examine the actual condition of the 170kV GIS-electrical facilities of private use and are able to confirm the distribution characteristic analysis of disconnecting switchgear. In this paper, we presents the actual condition investigation of the disconnecting switchgear of 170kV GIS-electrical facilities of private use by post - failure pattern, inspection method, test equipments and so forth.

• 융합보안논문지
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• 제17권5호
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• pp.163-178
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• 2017

최근 드론(drone)의 활용영역이 군사 및 보안 분야에서 뿐만 아니라 상업, 스포츠 등 일상생활 영역으로 확대되고 있으며, 민간경비업무에 드론을 활용하는 문제에 대해서도 관심이 커지고 있다. 본 연구는 민간경비(private security)에서의 드론의 활용유형과 경비업법과 항공안전법 등 관련 법규에서의 드론 관련 규정, 그리고 경비업법 수용시의 주요 쟁점을 검토하는데 논의에 초점이 있다. 첫째, 경비업법이 정하는 민간경비의 업무범위를 중심으로 드론의 활용유형을 감시업무, 정보수집업무, 안내 및 경고업무, 대피유도업무, 수색 및 관련 물자수송업무, 드론의 위협에 대한 대응업무 등으로 구분하였다. 둘째, 민간경비업무에서의 드론활용을 위한 관련 법규로는 경비업법과 항공안전법이 있는데, 이중 경비업법은 현재 드론에 관련한 내용을 규정하고 있지 않으며, 항공안전법에 의해 드론의 활용이 규제되고 있다. 셋째, 경비업법에 경비원의 자격과 권한범위를 조정하여야 하고, 드론을 경비장비의 한 유형으로 수용하여야 하며, 드론을 이용한 위협형태에 대한 대응책을 경비업법에서 어떻게 수용하여야 하는가에 대한 고민이 이루어져야 한다.

• 디지털산업정보학회논문지
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• 제10권1호
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• pp.89-97
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• 2014

Recently, spread of Smartphones caused activation of mobile services, because of that Big Data such as clouding service able to proceed with large amount of data which are hard to collect, save, search and analyze. Many companies collected variety of private and personal information without users' agreement for their business strategy and marketing. This situation raised social issues. As companies use Big Data, numbers of damage cases are growing. In this Thesis, when Big Data process, methods of analyze and research of data are very important. This thesis will suggest that choices of security levels and algorithms are important for security of private informations. To use Big Data, it has to encrypt the personal data to emphasize the importance of security level and selection of algorithm. Thesis will also suggest that research of utilization of Big Data and protection of private informations and making guidelines for users are require for security of private information and activation of Big Data industries.

• 한국정보전자통신기술학회논문지
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• 제16권1호
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• pp.24-32
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• 2023

현행 5G 특화망 이용절차는 신청, 심사, 이용, 이용 점검의 단계를 거치며 주파수 할당 전 절차로 신청, 심사단계, 주파수 할당 후 절차로 이용, 이용점검 단계로 구분할 수 있다. 5G 특화망 신청을 위해서는 여러 종류의 서류 제출이 필요하며, 서류 심사 과정과 5G 특화망 주파수 이용을 위한 무선국 검사로 인해 5G 특화망 신청 사업자가 실질적으로 특화망을 사용하기까지의 절차가 복잡하고, 상당한 시간이 소요된다. 본 논문에서는 현행 프로세스보다 신속하고, 간소화된 5G 특화망 주파수 할당을 위해 블록체인 플랫폼을 사용한 5G 특화망 주파수 할당 프로세스를 제안하였다. 블록체인 플랫폼과 NFT(Non-Fungible Token) 활용을 통해 주파수 할당 과정에서 필요한 데이터의 신뢰성과 무결성을 확보하였고, 주파수 이용 정보의 보안 유지와 신뢰 가능한 5G 특화망 주파수 할당 프로세스를 구축하였다. 또한 사람의 개입을 최소화하는 RPA 시스템을 적용하여 5G 특화망 할당 과정에서의 공정성을 확보하였다. 마지막으로 모의실험을 통하여 이더리움 블록체인 기반의 5G 특화망 주파수 할당 프로세스를 수행하였다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제15권8호
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• pp.2865-2878
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• 2021

As a current popular technology, the blockchain has a serious issue: the private key cannot be retrieved due to force majeure. Since the outcome of the blockchain-based Bitcoin, there have been many occurrences of the users who lost or forgot their private keys and could not retrieve their token wallets, and it may cause the permanent loss of their corresponding blockchain accounts, resulting in irreparable losses for the users. We propose a recoverable private key scheme for consortium blockchain based on the verifiable secret sharing which can enable the user's private key in the consortium blockchain to be securely recovered through a verifiable secret sharing method. In our secret sharing scheme, users use the biometric keys to encrypt shares, and the preset committer peers in the consortium blockchain act as the participants to store the users' private key shares. Due to the particularity of the biometric key, only the user can complete the correct secret recovery. Our comparisons with the existing mnemonic systems or the multi-signature schemes have shown that our scheme can allow users to recover their private keys without storing the passwords accurately. Hence, our scheme can improve the account security and recoverability of the data-sharing systems across physical and virtual platforms that use blockchain technology.