• 한국IT서비스학회지
• /
• 제16권2호
• /
• pp.1-20
• /
• 2017

A bitcoin-based technology named blockchain is garnering attention in various industries as a cost-effective measure in strengthening security and a reliable technology medium. Blockchain technology will play a critical role in the Fourth Industrial Revolution, and IT technology is expected to bring fundamental changes. This study focuses on the characteristics of blockchain technology and the effects of the intention to accept its technology in an empirical manner. The aspects of the technology are organized by researching blockchain technology and theories of technology acceptability and previous studies were used as guidelines to create the research model and propose the hypothesis. The research model is based on UTAUT with a set-up of 5 factors for performance expectancy and effort expectancy. For empirical analysis, a survey was conducted on 283 IT workers in Korea, To examine the hypothesis structural equation modeling was used performance expectancy was influenced by security, reliability, diversity, and economic efficiency while effort expectancy was influenced by reliability and economic efficiency. Performance expectancy, social influence, facilitating conditions affect the intention to accept. Innovativeness of an organization and control effects are influenced as well. The present study aims to provide practical guidance as supplementary research in utilizing blockchain technology, and the limitations of the study and future research possibilities are discussed as well.

• 융합신호처리학회논문지
• /
• 제20권4호
• /
• pp.218-225
• /
• 2019

2008년 비트코인에 대해 나카모도 사토시 백서가 발표된 이후 블록체인은 단순 암호화폐의 수단을 넘어서 다양한 산업에 사용될 수 있는 4차 산업혁명의 핵심 기술 중 하나로 각광받고 있다. 이에 블록체인 기술을 활용하기 위한 전 세계적으로 다양한 연구와 개발이 이루어지고 있으며, 글로벌 블록체인 컨소시엄을 결성하고 금융 분야뿐만 아니라 물류, 유통, 의료 등 다양한 산업분야로의 적용을 위한 시도가 계속되고 있다. 그러나 여전히 블록체인의 기술 발전이 이러한 관심과 기대를 충족시키는 수준까지 도달하지 못하고 있다. 이러한 블록체인 기반 서비스의 개발은 아직 시작 단계인 만큼 블록체인 플랫폼의 생태계 구축을 위해 필요한 요소들에 대한 논의가 중요하다. 본 논문에서는 블록체인 기술의 전반적인 개요를 살펴보고자 한다. 이를 위해 먼저 블록체인 기술의 개요에 대하여 설명하고, 생성된 블록을 기존의 체인에 연결하기 위한 합의 알고리즘, 국제표준 기구를 중심으로 한 블록체인 표준화 동향 및 블록체인의 한계점과 발생 가능한 보안 위협에 대하여 기술한다.

• 산업융합연구
• /
• 제21권8호
• /
• pp.51-58
• /
• 2023

최근 블록체인은 트릴레마를 해결하기 위해 이상적인 분산 신뢰 네트워크를 설계하려고 노력했다. 그러나 일부 국가간 분쟁으로 에너지 분배의 불균형이 발생했고, 현재 비트코인과 같은 블록체인 네트워크가 거래와 채굴을 위해 엄청난 에너지를 소비하고 있다. 기존 연구인 데이터 볼륨 기반 신뢰 모델은 루빈 방식의 신뢰 모델보다 증가하는 블록체인 크기를 더 잘 평가했다. 본 논문에서는 성장하는 블록체인 네트워크의 존속시간, 블록체인 크기 및 거래를 위해 소모된 에너지를 고려하여 블록체인 네트워크의 지속 가능성을 평가하는 확장성 기반 에너지 모델을 제안한다. 또한 수학적 분석을 통해 제안 모델과 기존 모델에 대한 만족도와 최적의 블록체인 크기를 비교한다. 그러므로 제안된 확장성 기반 에너지 모델은 트릴레마를 해결하고 지속 가능성을 검증하는 적절한 블록체인 네트워크를 선택할 수 있는 평가 툴을 제공할 것이다.

• 한국기록관리학회지
• /
• 제19권3호
• /
• pp.223-245
• /
• 2019

4차 산업혁명의 기반으로서 블록체인은 다양한 산업에서 신성장 동력을 만들어내는 중요한 핵심 인프라이면서 기술로 자리를 잡아가고 있다. 세계적으로 블록체인에 대한 관심이 기업과 기관의 환경으로 빠르게 확산되고 있다. 본 연구에서는 블록체인 기술의 특성 및 동향을 조사 및 정리하고 공공기관 기록관리부분에 블록체인 기술의 적용이 필요한지 알아보았으며 공공기관의 기록관리분야의 구축절차 및 구축방법을 문헌으로 연구하였다. 최종적으로 기록물관리분야에 블록체인 기술을 적용하여 아카이브체인(Archivechain)모델을 제안하고 어떠한 기대가 예상되는지 기술하고자 하였다. 전자문서의 기록관리 과정을 기록한 트랜잭션이 블록체인에 탑재되게 되면 단편적으로 비연계되었던 기록관리 표준업무처리 과정에 모든 단계 정보를 한 번에 확인 할 수 있다. 전자기록관리시스템에 블록체인기능이 탑재된다면 문서를 획득 등록하여 문서를 생산한 자가 메타데이터 및 정보를 입력한 후 모든 내용을 저장하고 분류한다. 그렇게 되면 생산현황보고의 절차가 간결하게 될 것이고 원문정보공개서비스를 통해 실시간으로 정보를 제공할 수 있다. 아카이브체인(Archivechain)은 전자문서생산시스템과 기록관리시스템이 일체되었다는 가정하에 하이퍼레저 플랫폼을 적용하여 BaaS형 클라우드 인프라를 적용한 모델이다. 스마트하고 전자 정부로 진보하는 기록관리 체계를 만들기 위해 공공 기록물관리의 모든 생애주기에 블록체인에 배치함으로써 흩어져 있는 정보를 하나로 모을 수 있는 문제를 해결 할 수 있다.

• Journal of Information Processing Systems
• /
• 제18권2호
• /
• pp.173-187
• /
• 2022

A special government agency has been charged with implementing quality management to guarantee the quality of wild-simulated ginseng. However, these processes are carried out by use of documents, and this has resulted in information omission and high document management costs. To solve this problem, this study analyzed the existing quality management process by using a smart contract for the existing offline form and proposed a new quality management system for storing and managing all log data in the blockchain. This system reduced documentation management costs about quality management and recorded information in the previous step through the quality management steps, thus forming a step-by-step record chain. Experiments were conducted by implementing this system, which improved data integrity and reliability. Additionally, sensitive information, such as personal information, was included in the system by use of the off-chain technology.

• 통합자연과학논문집
• /
• 제14권2호
• /
• pp.65-72
• /
• 2021

This paper discusses on the implementation of blockchain system, specifically the private system for Energy trading purpose. Blockchain is records bundled together in blocks and added to the chain after ledger is generated. All the blocks in the entire networks should be same contents and also only the permitted nodes can join the chain in the private blockchain system, thus not that same block and permitted nodes cannot be accepted in terms of proof-of-work phase. We implement the all stages which are necessary to process blockchain system. After coding the whole process, we test and conclude that the system is correctly working in terms of the functions implemented.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제15권8호
• /
• pp.2849-2864
• /
• 2021

The emerging of cloud data sharing can create great values, especially in multi-cloud environments. However, "data island" between different cloud service providers (CSPs) has drawn trust problem in data sharing, causing contradictions with the increasing sharing need of cloud data users. And how to ensure the data value for both data owner and data user before sharing, is another challenge limiting massive data sharing in the multi-cloud environments. To solve the problems above, we propose a Uniform Encoding and Parsing Framework (UEPF) with blockchain to support trustworthy and valuable data sharing. We design namespace-based unique identifier pair to support data description corresponding with data in multi-cloud, and build a blockchain-based data encoding protocol to manage the metadata with identifier pair in the blockchain ledger. To share data in multi-cloud, we build a data parsing protocol with smart contract to query and get the sharing cloud data efficiently. We also build identifier updating protocol to satisfy the dynamicity of data, and data check protocol to ensure the validity of data. Theoretical analysis and experiment results show that UEPF is pretty efficient.

• 디지털산업정보학회논문지
• /
• 제15권1호
• /
• pp.77-86
• /
• 2019

Comparative analysis to secure safety of Blockchain Many investors have invested in virtual currency such as bit coins as a new investment due to increased popularity of virtual currency around the world. Also, virtual currency such as bit coin has a security technology and it has been relatively proved. popularity of virtual currency is rising as a new investment alternative because of this reason. This paper focused on the block chain's transparency and security of distributed ledger technology, which is relatively safe without third party's intervention. Many governments and companies around the world are developing and working on block chain technological development to introduce due to these reasons However, there are some suggestion that block chain has minor risks to its security. In this paper, it will examine security vulnerabilities from importance of security of Blockchain which relates to transactions of Bitcoin which stored by governments and companies around the world. This paper will propose measure which will improve safety and efficiency of Blockchain technology such as the existing Blockchain method, Blockchain proposal, traceability and awareness about hacking.

• International Journal of Computer Science & Network Security
• /
• 제21권8호
• /
• pp.111-118
• /
• 2021

Banking systems are sensitive to data privacy since users' data, if not well protected, may be used to perform fake transactions. Blockchains, public and private, are frequently used in such systems thanks to their efficiency and high security. Public blockchains fail to fully protect users' data, despite their power in the accuracy of the transactions. The private blockchain is better used to protect the privacy of the sensitive data. They are not open and they apply authorization to login into the blockchain. However, they have a lower security compared to public blockchain. We propose in this paper a hybrid public-private architecture that profits from network virtualization. The main novelty of this proposal is the use of network virtualization that helps to reduce the complexity and efficiency of the computations. Simulations have been conducted to evaluate the performance of the proposed solution. Findings prove the efficiency of the scheme in reducing complexity and enhancing data privacy by guarantee high security. The contribution conducted by this proposal is that the results are verified by the centralized controller that ensures a correct validation of the resulted blockchains. In addition, computation complexity is to be reduced by profiting from the cooperation performed by the virtual agents.

• 한국정보시스템학회지:정보시스템연구
• /
• 제31권3호
• /
• pp.131-152
• /
• 2022

Purpose The purpose of this study was to investigate the intention of using a news media platform using block chain through media company workers in a situation where various platform services using block chain are being newly released in the media industry. Therefore, in this paper, we intend to explore the development direction of the news media platform service using the block chain in the future by deriving implications through the characteristics of the block chain, user characteristics, and self-determination factors. Design/methodology/approach This study conducted a survey on the main characteristics of blockchain, user characteristics, self-determination, resistance to innovation, etc., and designed a research model by integrating factors on the continuity of intention to use the news media platform. Findings According to the empirical analysis result, in this study, it was confirmed that the intention to use the blockchain news media platform is significantly related to decentralization, which is a characteristic variable of the blockchain, perceived risk, which is a user characteristic variable, and competence and relationship, which is a self-determination variable. In addition, it was confirmed that it affects the perceived ease of use with respect to the intention to use. In addition, in this study, news writers write more careful articles as they cannot edit articles once written, which can contribute to improving the quality of news content.