• Annual Conference of KIPS
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• 2020.05a
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• pp.358-360
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• 2020

본 연구보고서는 기부사용내역 불투명성 등으로 인해 감소 추세에 있는 기부금의 감소문제를 분석하고 이를 해결하기 위한 방안을 모색함. 연구의 목적은 Block Chain을 활용하여 기존의 기부시스템 개선 및 새로운 기부시스템 도입에 있음. 기부문화 활성화를 위해서는 기부금 사용에 대한 신뢰성 확보가 필수적. 따라서 기부금 사용내역을 투명하게 관리하는 시스템이 필요함. 이를 위해 블록체인을 기반으로 한 새로운 기부시스템 (New Donation System) 연구를 진행하였음. 새로운 기부시스템이 구축되기 위해서는 기부자, 기부단체, 정부가 서로 연계하여 블록체인을 기반으로 한 기부코인을 도입하고 이를 활용하는 금융 메커니즘의 적용이 필요함. 기부코인을 활용한 새로운 기부시스템이 도입된다면 우리나라의 기부시스템은 기존보다 진일보할 것이며 기부문화도 재활성화될 것으로 기대함.

• Annual Conference of KIPS
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• 2023.05a
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• pp.209-211
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• 2023

ICT 기술을 통해 데이터를 수집하고 수집된 데이터를 활용하여 시민의 삶의 질을 향상시키는 스마트시티는 대표적으로 전기, 건물, 냉난방 시스템, 교통이 있다. 스마트시티의 교통 문제를 해결하기 위하여 IoV의 데이터를 활용할 수 있으나, IoV에 대한 네트워크 공격이 급증함에 따라 블록체인을 사용하여 데이터를 안전하게 수집하고 스마트시티에 활용하는 다양한 연구가 진행되고 있다. 본 논문에서는 스마트시티 환경의 IoV 시스템을 위한 블록체인 기반 차량 네트워크 보안 기술 연구 동향을 기술하고 향후 연구 방향을 제시한다.

• Smart Media Journal
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• v.9 no.1
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• pp.9-15
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• 2020

Recently there have been increasing attempts to apply blockchains to businesses and public institutions. Blockchain is a distributed shared ledger with excellent transparency and security of data and through consensus algorithm, the same data can be shared to all nodes in order. In this paper, Modified PBFT which does not modify the PBFT consensus algorithm is proposed. MPBFT is able to tolerate Byzantine faults on a private blockchain on an asynchronous network. Even with the increase of participating nodes, the network communication cost can be effectively maintained. Modified PBFT takes into account the characteristics of an asynchronous network environment where node-to-node trust is guaranteed. In response to the client's request, PBFT performed the entire participation broadcast several times, but Modified PBFT enabled consensus and authentication through the 2 / N leader. By applying the Modified PBFT consensus algorithm, the broadcast process can be simplified to maintain the minimum number of nodes for consensus and to efficiently manage network communication costs.

• The Journal of the Convergence on Culture Technology
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• v.6 no.4
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• pp.219-224
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• 2020

One of the main reasons for the commercial failure of various early blockchain-based art trade platforms, including Maecenas, is the lack of clear ways for owners to fully restore ownership of artworks. In this paper, we proposed a procedure for the owner of the artwork to rebuy shares and restore his or her entire ownership in the blockchain system. Using the proposed procedure, we can find a balanced price between the owner and investors, and then restore ownership through a public purchase of the stake. The balanced price can be induced by penalizing the owner for proposing unreasonably low price, and by rewarding investors for deciding reasonable prices. The proposed procedure of restoring ownership is expected to be utilized not only on the block chain-based art trading platform but also on the block chain-based trade platform in other applications.

• Journal of Convergence for Information Technology
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• v.9 no.7
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• pp.14-24
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• 2019

It is necessary to look into multiple subjects, such as effectiveness, laws and polices of blockchain in order to easily accept blockchain technology in small and mid-sized enterprises(SME). This study analyzes the positive effects of applying the block chain to SMEs, examines the laws and policies required to apply them, and identifies the tasks. As a result, we confirmed that it can create positive effects such as optimizing supply chain management, simplifying import and export process documents, improving product quality, facilitating flow of funds, and improving transaction reliability. Also, we confirmed that it is necessary to improve the basic law of electronic transaction, electronic commerce law, electronic financial transaction law, personal information protection legislation, and needs policy supplement for platform development, education system for SMEs, transaction standardization guidelines, tax reduction policy, and block chain research and development. More extensive practical research and specific individual legal studies are needed in the future.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.23 no.5
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• pp.604-612
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• 2019

PKI Internet banking is used to have users register their public keys with the banking server together with the identity information, and verify the signature for both user and transaction authentications by using the registered public keys. Although the Blockchain-based financial systems such as Bitcoin adopt similar digital signature-based authentication scheme, there is no server that participants can register public keys with because they perform P2P payment transactions. The purpose of this paper is to identify the advantages and disadvantages of the Blockchain-based payment transactions by analyzing the differences between the most common PKI Internet banking and Blockchain payment systems. Based on the analysis, this paper suggests the issues that need to be enhanced from the aspects of architecture and security in order for Blockchain payment transaction systems to be applied universally.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.24 no.6
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• pp.795-801
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• 2020

In the event of a fatal infectious disease in the country, it is very important that the government respond quickly and prevent the secondary infection of the people to prevent the subsequent spread of damage. However, in order to detect infectious diseases in existing medical institutions, and to reach the KCDCP(Korea Centers for Disease Control and Prevention) a total of four steps must be taken. In this paper, we simplifies the existing reporting process using the open blockchain. In addition, not only infectious disease related organizations share infectious disease information on the blockchain, but also grant access to the blockchain to ordinary citizens. By sharing information quickly and transparently revealing the process, we can add credibility to the response to the outbreak and official announcements. The public can also build efficient next-generation defense systems by checking information on the blockchain to prevent secondary infections.

• Journal of the Korea Society of Computer and Information
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• v.26 no.4
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• pp.75-84
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• 2021

In this paper, we introduce InfoDID, a robust user information management service based on DID that manages user information reliably. Since blockchain technology provides an environment in which data can be handled transparently on a decentralized basis, various services using blockchain are currently being developed As the importance of user's personal information has recently emerged, the DID technology is receiving attention. The technology allows a user to control his or her information through decentralized identifiers, and various information management services are being tried based on the technology. Using blockchain-based DID technology, InfoDID reliably controls personal information requested frequently, helping users to provide their information to other services more conveniently. In addition, to support service continuity, InfoDID uses BR2K technique that provides robust execution of blockchain application services, so that even partial service failures can be systematically recovered. To facilitate this operation, we present a replication status monitoring tool that can continuously check the replication states of blockchain application services running in association with the BR2K technique such as InfoDID.

• Journal of the Korea Society for Simulation
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• v.32 no.4
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• pp.59-67
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• 2023

Private blockchains can apply enhanced security policies that allow only authorized users to participate in the blockchain network. In addition, when used in a career management system where the validity of an individual's career is important, it has the suitable characteristics in terms of information integrity. However, due to the excessive performance requirements of blockchain technology, identifying performance characteristics through simulation can be helpful in stable operation of the system. This paper presents research results that utilized performance evaluation results while constructing a career management system based on the Ethereum blockchain. The service not only serves as a portfolio that records personal career development activities, certification acquisition, and award results, but also provides a community function for career planning to strengthen employment competitiveness. In addition, we present how a compensation policy can be executed to encourage users to participate in career development through community activities. In particular, an appropriate compensation policy was derived by reviewing changes in performance characteristics in accordance with the transaction volume on Geth nodes.

• Proceedings of the Korean Society of Computer Information Conference
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• 2017.07a
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• pp.7-8
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• 2017

본 논문에서는 IoT 시스템에서 사물간의 자율적 거래를 할 수 있는 블록체인 기반의 지능형 에이전트 시스템을 제안하였다. 제안한 시스템은 블록체인 오픈 플랫폼인 하이퍼렛저 페블릭(Hyperledger Fabric)을 사용하여 구현하였으며, 시스템의 무결성을 입증하였다. 시스템의 유용성을 보이기 위해 서비스의 사례로 무인자판기가 스스로 물류센터에 발주하는 시스템을 구현하였으며, 이를 통해 사람의 판단과 거래를 자율성을 갖은 사물들로 대체될 수 있는 다양한 분야에 활용할 수 있는 시스템을 제안하였다.