• Proceedings of the Korea Information Processing Society Conference
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• 2017.11a
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• pp.8-11
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• 2017

블록체인 기반의 가상 지갑을 만들어 그 가상 지갑 안에 현금 지폐를 쓰고 남은 거스름돈을 적립해 주는 사업 방식을 제시한다. 블록체인을 활용하여 기존의 선불카드를 이용한 거스름돈 적립의 복잡함을 없애고 간단한 알고리즘의 가상지갑에 거스름돈을 적립할 수 있다.

• Proceedings of the Korea Information Processing Society Conference
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• 2018.10a
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• pp.85-86
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• 2018

본 연구에서는 프린터에 블록체인을 사용하여 정보의 신뢰성을 기반으로 안전하고 편리하게 소모품을 주문할 수 있는 시스템을 구축하는 것을 목표로 한다. 스마트 컨트랙트를 활용하여 기존의 거래 시의 불편함을 감소시키고 주문뿐만 아니라 결제까지 안전하게 이루어지도록 한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2019.05a
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• pp.182-185
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• 2019

최근 다양한 보안 사고들이 발생함에 따라 보안의 중요성이 대두되고 분야를 가리지 않고 일어나는 보안 이슈에 대응하기 위한 개발이 다양화되고 있다. 이 중 블록체인 기반 암호화폐의 일종인 이더리움(Ethereum)의 탈중앙화 어플리케이션(DApp) 시스템이 이슈화되었다. DApp을 이용하여 개발된 취약점 분산 관리 솔루션은 DApp의 기능과 장점을 포함한다. 취약점 분산관리 솔루션은 현 시대의 데이터 관리 구조의 문제점을 해결하기 위한 대책으로 제시되며 필요성을 드러낸다. 또한, 기존의 중앙 집중형 시스템에서 벗어나 솔루션의 이점을 활용하여 사용 영역을 확장할 수 있다.

• Proceedings of the Korea Information Processing Society Conference
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• 2019.10a
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• pp.453-455
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• 2019

과거 대비 국내 기부 문화의 성장 속도는 해가 거듭될수록 침체 되고 있다. 기부가 저조한 가장 큰 이유는 기부 단체에 대한 불신이다. 본 논문은 블록체인 기술을 이용한 이더리움 스마트 컨트랙트를 구현하여 거래의 투명성을 확보하고 기부에 대한 신뢰성을 향상시킬 수 있는 기부 시스템을 연구 및 설계하였다. 향후 이 시스템은 암호화폐의 사용이 활발해질 수록 보다 다양한 서비스를 제공할 수 있을 것이다.

• Journal of the Korea Safety Management & Science
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• v.19 no.4
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• pp.183-188
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• 2017

Block Chain is a technology that records and shares distributed ledgers without a central authority, providing a decentralized platform for transparent transactions in the business and enhancing transparency and traceability in all transactions to ensure trust in the transaction. Despite initial doubts about this technology, it is committed to adopting, adapting and improving the technology in a wide range of industries, including finance, government, security, logistics, food, medical, legal, and real estate. This study examines this technology, its applicability and potential benefits to the manufacturing supply chain. A tracking system of manufacturing supply chain to visualize transparency and traceability is implemented, and the conditions for adopting the technology in the manufacturing supply chain and the issues to be addressed are discussed.

• Proceedings of the Korean Society of Computer Information Conference
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• 2019.01a
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• pp.389-390
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• 2019

최근 블록체인 기반의 어플리케이션이 증가하고 이들을 위한 스마트 컨트랙트가 설계상 오류로 부적절하게 사용될 가능성이 증대되고 있다. 따라서 스마트 컨트랙트의 설계를 보다 안전하게 지원할 수 있는 방안이 필요한 실정이다. 본 논문에서는 State machine을 이용하여 이더리움 스마트 컨트랙트의 기능사용을 보다 안전하게 지원하기 위한 기법을 제안한다. 제안된 기법은 전체 동작의 흐름의 제어하기 위한 Transition Contract와 각각 상태에 대한 스마트 컨트랙트인 State Contract를 이용하여 스마트 컨트랙트의 동작과정을 제어한다.

• International Journal of Computer Science & Network Security
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• v.21 no.4
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• pp.9-18
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• 2021

Blockchain and its infrastructure technology have expanded rapidly in the last decade and are in high demand, but there is a lack of comprehensive studies on those platforms. Blockchain is a new technology based on the distributed digital ledger system. Decentralized trust is one of the key factors behind the blockchain-based system. Transparency of such a system is better than a conventional centralized ledger system. By using a blockchain-based transaction system, any business organization can harness key benefits like data integrity, confidentiality, and anonymity without involving any third party in control of the transactions. Since the blockchain is used in numerous applications and the horizon is expanding at an unprecedented pace. So, there is a need for an introducing and reviewing of blockchain platforms. In this paper, we have reported a review on existing contemporary blockchain platforms. In particular, From the existing studies, we have identified eighty blockchain platforms and the majority of them have a lack of technical details. To provide the researchers a comprehensive introducing on blockchain platforms to perform a broad guideline for future research and investment in the blockchain domain.

• Electronics and Telecommunications Trends
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• v.37 no.1
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• pp.63-72
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• 2022

Recently, blockchain has been attracting attention as a high-reliability technology in various fields. However, the Proof-of-Work-based distributed consensus algorithm applied to representative blockchains, such as Bitcoin and Ethereum, has limitations in applications to various industries owing to its excessive resource consumption and performance limitations. To overcome these limitations, various distributed consensus algorithms have appeared, and recently, hybrid distributed consensus algorithms that use two or more consensus algorithms to achieve decentralization and scalability have emerged. This paper introduces the technological trends of the latest high-performance distributed consensus algorithms by analyzing representative hybrid distributed consensus algorithms.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.16 no.3
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• pp.861-876
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• 2022

Cryptoassets such as Bitcoin and Ethereum are widely traded around the world. Cryptocurrencies are also transferred between investors. Cryptocurrency has become a new and attractive means of remittance. Thus, blockchain-based smart contracts also attract attention when central banks design digital currencies. However, it has been discovered that a significant amount of cryptoassets on blockchain are lost or stranded for a variety of reasons, including the loss of the private key or the owner's death. To address this issue, we propose a method for recoverable transactions that would replace the traditional transaction by allowing cryptoassets to be sent to a backup account address after a deadline has passed. We provide the computational workload required for our method by analyzing the prototype. The method proposed in this paper can be considered as a good model for digital currency design, including central bank digital currency (CBDC).

• Journal of the Semiconductor & Display Technology
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• v.20 no.4
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• pp.187-191
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• 2021

In the digital world, the transactions of assets with intrinsic value can be applied to games, literature, art, and music by issuing NFTs (Non-Fungible Tokens) based on Blockchain; various NFT exchanges are emerging accordingly just like real world asset exchanges. However, there could be an issue of copyright infringement in those NFT transactions. Therefore, this paper has classified the types of copyright infringement that may occur in NFT exchanges and proposes the copyright infringement countermeasures according to them. For this purpose, 10 types of NFT exchange are examined. Eventually, it can be expected that the proposed countermeasures will contribute to the revitalization of the NFT market by providing solutions for those issues.