• Proceedings of the Korea Information Processing Society Conference
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• 2019.05a
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• pp.705-708
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• 2019

본 논문에서는 블록체인 기반의 주유소 시스템을 제안하였다. 매년 주유소에서 발생하는 대표적인 불법 행위인 경유와 등유를 섞어 제조한 가짜 석유 판매 및 정량 미달 기름 판매를 막기 위해 주유소 기름의 이상 여부를 확인하는 시스템을 이더리움 블록체인의 스마트 컨트랙트를 통해 구현하였다. 시스템의 적용을 보이기 위해 가상의 주유소를 웹페이지로 구현하였으며, 시스템과 기기들 간의 상호작용을 확인하였다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2023.07a
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• pp.567-568
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• 2023

본 논문에서는 블록체인 기반 DID기술을 이용하여 원격교육에서 발생하는 학습데이터를 효율적으로 관리하기 위한 방법으로, 학습데이터 가중치를 고려한 DID 메타데이터관리방법을 제안하였다. 메타데이터의 식별자에 대하여 특정위치로 데이터 가중치를 검색하도록 하고 해당 가중치에 따라 처리방법을 다양화 할 수 있다. 본문에서는 블록체인의 Zero Knowledge Proof 방식 처리에 차별화를 두어 메타데이터를 처리하였으며 데이터 처리속도 및 데이터관리에 효율성높일 수 있다.

• Journal of the Korea Society of Computer and Information
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• v.25 no.5
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• pp.217-227
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• 2020

In this paper, I propose that what factors affect logistics companies' adoption of blockchain technology and to analyze the effects of blockchain technology on logistics performance. The variables influencing the adoption of blockchain technology were presented based on the TOE frame. Expected profit, organizational readiness, technology compatibility, and competitive pressure were suggested as factors to adopt blockchain technology. Also, as a blockchain technology, smart contracts and information transparency were presented. Logistics performance suggested agility and alignment. A survey was conducted with Korean logistics companies. Looking at the results of analyzing the collected data, it was found that expected profit and technology compatibility have a positive effect on this blockchain technology (smart contract, information transparency). Organizational readiness was found to have a positive effect on information transparency. Blockchain technology was found to have a positive effect on logistics performance.

• Journal of The Korean Association of Information Education
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• v.23 no.2
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• pp.141-148
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• 2019

We proposed a curriculum that can learn the principle of blockchain by using the gamification which can bring up the interest and concentration of the students by connecting the contents of the class with the game. The proposed method is to educate the blockchain in a game format and to solve the problem that can be easily accessed in everyday life by applying the blockchain. By strengthening the thinking ability of computing, By growing information processing capacity, communication capacity, and community capacity, students can naturally enhance their education capacity. It is expected that the blockchain curriculum using the proposed gamification can be used to improve the information curriculum.

• Journal of the Korea Society of Computer and Information
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• v.25 no.10
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• pp.77-86
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• 2020

In this paper, we propose a technique for blockchain service replication and recovery using kubernetes(BR2K) that robustly executes blockchain services based on replication and supports systematic recovery in case of the service failure. Blockchain services are being developed and applied in various fields such as administration, finance, and medical systems based on the features of blockchain, such as decentralization, high security, and data integrity. In such areas where service continuity is important, it is necessary to provide robustness for execution of blockchain services, and a recovery plan for service failure is also required. To this end, BR2K provides an execution replication technique that systematically supports the sustainable execution of blockchain application services. Also, it introduces a robust container registry based on the blockchain service registry, systematically supporting the recovery of service failures by using it. In addition, Truffle, a blockchain service development framework, is extended to utilize the Kubernetes container management tool, and BR2K provides a technique for rapidly deploying blockchain services using the extended framwork.

• Review of KIISC
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• v.32 no.4
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• pp.119-126
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• 2022

ISO TC 307에서는 2022년 2월 두 번째 국제 표준인 ISO 23257 - 블록체인 및 DLT - 참조 아키텍처(Reference architecture) 표준을 제정하였다. 이 논문에서는 신규 제정된 참조 아키텍처 표준의 내용을 소개하고, 타 표준과의 연계 및 향후의 영향에 대해 논한다.

• 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.

• Journal of Internet Computing and Services
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• v.21 no.1
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• pp.95-102
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• 2020

In this paper, we present a healthcare data integration management and sharing platform based on a permissioned blockchain-based system called the Hyperledger fabric. The Hyperledger fabric allows patients to easily access their data, share the data with agencies that need it, and also reward participants. The healthcare data is stored in the blockchain by a de-identification process. Privacy is protected by setting detailed access rights to the stored data. The proposed model provides higher security than other models using a public blockchain. This study confirms that patient data can be stored more securely, by comparing the data stored in the blockchain with that from existing information storage methods.

• Management & Information Systems Review
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• v.38 no.1
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• pp.83-101
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• 2019

Blockchain is considered as an innovative technology along with Artificial Intelligence, Big Data, and Internet of Things. However, since the inception of the genesis of blockchain technology, the cryptocurrency Bitcoin, the technology is not utilized widely, not let alone disruptive applications. Most of the blockchain research deals with the cryptocurrency, general descriptions of the technology such as trend, outlook of the technology, explanation of component technology, and so on. There are no killer applications like Facebook or Google, of course. Reflecting on the slow adoption by businesses, we wanted know about the current status of the research on blockchain in Korea. The main purpose of this paper is to help business practitioners to identify the application of blockchain to enhance the competitiveness of their organization. To do that, we first use the framework by Iansiti et al (2017) and categorize the blockchain related articles published in Korea according to the framework. This is to provide a benchmark or cases of other organizations' adoption of blockchain technology. Second, based on the value proposition of blockchain applications, we suggest evolutionary paths for adopting them. Third, from the demand pull perspective of technology adoption for innovation, we propose applicable areas where blockchain applications can be introduced. Fourth, we use the value chain model to find out the appropriate domains of blockchain applications in the corporate value chains. And the five competitive forces models is adopted to find ways of lowering the power of forces by incorporating blockchain technology.

• Review of KIISC
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• v.33 no.2
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• pp.49-56
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• 2023

양자 컴퓨터의 기술이 발전됨에 따라 Shor 알고리즘과 Grover 알고리즘을 통해 기존의 공개키, 대칭키 및 해시 암호체계에 위협을 줄 수 있다. RSA 및 ECC 암호체계는 Shor 알고리즘에 의해 다항시간 내에 해독이 가능해진다. 이러한 보안위협의 증가로 양자내성의 성질을 지닌 양자내성암호가 주목받고 있으며 양자내성 전자서명을 블록체인의 전자서명에 적용하기 위한 다양한 연구가 진행되고 있다. 본 논문에서는 양자내성암호를 블록체인의 전자서명에 적용하는 연구동향에 대해 설명한다.