• Journal of the Korea Institute of Information and Communication Engineering
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• v.16 no.9
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• pp.1923-1930
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• 2012

'No-Automobile driving Day' is one of Special option of Automobile Insurance in Republic of Korea. It option is used a system for collect to automobile driving information. However, Its system gives discomfort to users of this system. A Discomfort of this system to users is the OBD device's(Personal Car Driving Check Device) installation. A frequent installation of this device provides this OBD device's breakage to the users of this system. In this paper, for a solve this problem, studied new system design to supplement the existing system using Smartphone and WPAN(Wireless Personal Area Network).

• Journal of the Korea Institute of Information Security & Cryptology
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• v.29 no.1
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• pp.67-75
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• 2019

When a Solidity smart contract has a problem in calling a function of another contract, the fallback function is supposed to be executed automatically. However, it may be are arbitrarily created, with their behaviors unknown to developers, and fallback function execution is vulnerable to exploits by attackers. in In this paper, we propose a preprocessing based method to reduce the risk with less overhead of developers'. Developers mark the intention using the newly defined keywords in this paper, and the preprocessor reduces the risk by preprocessing the conditional variables and conditional statements according to the keywords.

• Korean Journal of Construction Engineering and Management
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• v.24 no.1
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• pp.12-20
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• 2023

To calculate the amount of owner-caused and contractor-caused delays based on a simplified delay analysis, which has been customarily used in Korea, has a limitation in reflecting the impact of the concurrent delay and the acceleration work. It also resulted in the apportionment of liquidated damages by applying the ratio of the number of delays between the owner and the contractor. This study analyzes that the conventional method does not meet the international standards. In order to improve the problem of construction delay analysis and the apportionment of liquidated damages based on it, owner delays, contractor delays, concurrent delays, and the impact of acceleration should be analyzed together. This study suggests that in the apportionment of liquidated damages, the extension of time should be extended by the sum of concurrent delays and the owner-caused delays, and liquidated damages should be imposed on delays incurred after the extension of time. It can be seen that it conforms to the international standards. The results of this study are expected to contribute to improving the problems of delay analysis and liquidated damages calculation, which have been conventionally accepted.

• Journal of Advanced Navigation Technology
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• v.27 no.5
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• pp.594-609
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• 2023

This research introduces a novel approach to address the complexities of the 5G ceramic antenna manufacturing process through the utilization of a blockchain-based 5G ceramic antenna manufacturing (B-5GAM) architecture. By seamlessly integrating blockchain technology and smart contracts, this architecture enhances transparency, security, and efficiency within the realm of 5G ceramic antenna manufacturing. The impact of applying blockchain to enhance security measures, process efficiency, and overall reliability is evident, not only optimizing the production process but also establishing a robust foundation for future advancements in communication technology. Validation of the B-5GAM architecture was achieved by manufacturing 5G antennas and implementing blockchain and smart contracts through algorithm proposals, confirming their practicality in real manufacturing environments. The results of this study demonstrate the feasibility of employing blockchain and smart contracts in the field of 5G ceramic antenna manufacturing, confirming their potential to enhance manufacturing efficiency and reliability.

• The Journal of Society for e-Business Studies
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• v.23 no.3
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• pp.173-187
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• 2018

After Satoshi Nakamoto published 'Bitcoin: A peer-to-peer electronic cash system' in 2008, Blockchain has been GPT (General Purpose Technologies) that affect the whole cycle of the $4^{th}$ Industrial Revolution. This study attempted to identify the innovativeness of Blockchain. Because of Blockchain's ambidextrous characteristics, Blockchain has two kinds of innovativeness, technological innovation by physical technology and social innovation by social technology. Thus, this study will be useful to increase understanding and establishing strategy for Blockchain.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2022.11a
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• pp.227-228
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• 2022

The slowdown of the global economic market due to the pandemic is causing the global construction market to stagnate, and the use of smart construction technology is drawing attention as one of the main alternatives to overcome this problem. In fact, a number of previous studies have been published that smart construction technologies such as building information modeling and drones can contribute to project performance improvement, such as productivity improvement and cost reduction. However, previous studies focus on the application direction and technical effectiveness of smart construction technology, so the analysis in terms of the contribution that the application of the technology has to the project performance is insufficient. Therefore, the purpose of this study is to focus on the effectiveness aspect of the application of smart construction technology on the project performance. The results of this study are expected to be able to be used as basic data for establishing policies related to the activation of smart construction technology promoted by the government and setting the direction for the use of smart construction technology by stakeholders.

• Journal of Service Research and Studies
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• v.13 no.1
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• pp.108-126
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• 2023

This study explored the sustainability of a blockchain-based cultural art performance video platform through the construction of Gyeonggi Art On, a new media art broadcasting station in Gyeonggi-do. In addition, the technical limitations of video content transaction using block chain, legal and institutional issues, and the protection of personal information and intellectual property rights were reviewed. As for the research method, participatory observation methods such as in-depth interviews with developers and operators and participation in meetings were conducted. The researcher participated in and observed the entire development process, including designing and developing blockchain nodes, smart contracts, APIs, UI/UX, and testing interworking between blockchain and content distribution services. Research Question 1: The results of the study on 'Which technology model is suitable for a blockchain-based performance video content distribution public platform?' are as follows. 1) The blockchain type suitable for the public platform for distribution of art performance video contents based on the blockchain is the private type that can be intervened only when the blockchain manager directly invites it. 2) In public platforms such as Gyeonggi ArtOn, among the copyright management model, which is an art based on NFT issuance, and the BC token and cloud-based content distribution model, the model that provides content to external demand organizations through API and uses K-token for fee settlement is suitable. 3) For public platform initial services such as Gyeonggi ArtOn, a closed blockchain that provides services only to users who have been granted the right to use content is suitable. Research question 2: What legal and institutional problems should be reviewed when operating a blockchain-based performance video distribution public platform? The results of the study are as follows. 1) Blockchain-based smart contracts have a party eligibility problem due to the nature of blockchain technology in which the identities of transaction parties may not be revealed. 2) When a security incident occurs in the block chain, it is difficult to recover the loss because it is unclear how to compensate or remedy the user's loss. 3) The concept of default cannot be applied to smart contracts, and even if the obligations under the smart contract have already been fulfilled, the possibility of incomplete performance must be reviewed.

• Proceedings of the Korea Information Processing Society Conference
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• 2018.10a
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• pp.288-291
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• 2018

블록체인은 암호화폐의 기반이 되는 기술로 데이터를 P2P 분산 방식으로 체인 형태로 기록하여 보안성과 안전성을 갖?다. 중앙 집권화에서 벗어나 사용자들의 네트워크에서 자유롭고 안전한 거래를 가능하게 하는 블록체인은 현재 스마트 계약, 암호화폐, 개인 정보 인증 등 다양한 방법으로 활용되고 있다. 블록체인 사용자들은 거래의 안전성을 위해 채굴이라는 과정으로 블록을 인증하는데 절반 이상의 해시파워를 가진 공격자가 거래내역을 조작하는 것이 51% attack이다. 채굴자들은 채굴을 위해 전문 장비를 개발하고 이익을 도모하기 위해 모이면서 큰 집단으로 모이면서 51% attack에 대한 공격가능성이 높아졌고 실제로 엄청난 피해를 입힌 공격 사례가 있다. 따라서 본 논문은 51% attack의 사례와 기존 대응방안인 PoS 방식과 dPoW 방식 및 각 방식에 대한 한계를 분석하였고 이를 보완한 새로운 블록체인 모델을 제안한다.

• Electronics and Telecommunications Trends
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• v.38 no.1
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• pp.65-76
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• 2023

Decentralized autonomous organizations (DAOs) is an effective and secure means to enable direct collaboration between people who want to achieve common goals in a digital environment, where believing each other without intermediaries from trusted third parties is difficult. DAO can flexibly implement most of the roles previously performed by existing organizations and finally aim for a new structure that functions independently without human intervention. Despite its technical and legal uncertainties and problems, DAO is rapidly expanding. This study examines trends such as the concept, use cases, participation methods, and deficiencies of DAO, which is called the future of work and helps to understand upcoming considerations.

• Proceedings of the Korea Information Processing Society Conference
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• 2021.11a
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• pp.344-347
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• 2021

최근 환경문제에 관한 관심이 높아짐에 따라 전기차 시스템에 관한 연구개발도 활발히 진행되고 있다. 이에, 본 논문에서는 충전 가능성 예측을 위한 인공지능 기술과 학습 데이터의 무결성 보장, 데이터 속 개인정보 보호를 위한 블록체인 기술을 활용한 스마트 계약 중심의 효율적인 전기차 충전 시스템을 설계한다. 또한, 시스템 구현을 위한 충전 시스템의 충전 전, 충전 중, 충전 후로 나누어 제안하고, 충전소 선택 과정을 그림으로 보이며 실제 구현에 필요한 내용을 구성요소별로 제시한다.