• 소프트웨어공학소사이어티 논문지
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• 제28권2호
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• pp.1-6
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• 2019

블록체인 생태계에는 다양한 이해관계자들이 존재한다. 이더리움이 등장한 이후 스마트 컨트랙트를 활용한 거래가 많이 이루어지게 되었고 개발자뿐만 아니라 투자자, 은행, 기업, 일반 사용자 등등 더욱 폭넓은 이해관계자들이 참여하고 활동하고 있다. 하지만 다양한 이해관계자가 스마트 컨트랙트의 상태를 확인하기 위해서는 어렵고 복잡한 과정을 거쳐야 한다는 문제점을 가지고 있다. 상태 확인이 어렵게 된다면 스마트 컨트랙트에 대한 신뢰도가 낮아지게 되어 활용도가 낮아질 것이다. 개발자에게 있어서도 상태 확인이 어렵고 복잡하다면 자신이 개발한 스마트 컨트랙트의 테스팅과 디버깅을 하는데 어려움을 겪어 높은 품질을 제공하기 힘들 것이다. 본 연구에서는 다양한 이해관계자와 개발자들이 스마트 컨트랙트의 상태를 쉽고 지속적으로 확인할 수 있으며 히스토리 데이터를 활용하여 분석할 수 있도록하는 이더리움 스마트 컨트랙트 상태 모니터링 시스템의 설계 및 구현 방법을 제안한다.

• 한국인터넷방송통신학회논문지
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• 제20권4호
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• pp.115-121
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• 2020

블록체인의 참여가 증가하면서 생태계 유지를 위한 거버넌스가 활성화되고 있다. 거버넌스는 블록체인을 유지하고 발전시키기 위해 관리/감독이 이루어져야 한다. 하지만 블록체인의 사용량이 증가함에 따라 사람이 일일이 관리하기엔 한계가 존재한다. 또한, 이더리움부터 적용된 스마트 컨트랙트라는 새로운 거래 형태가 가능함에 따라 상태 값에 따라 결정되는 거래에 대해 검증이 필요하다. 본 연구는 거버넌스의 블록체인 생태계 유지와 발전을 위한 도구로 블록체인 스마트 컨트랙트의 상태 모니터링을 기반으로 하는 관제시스템(Blockchain Watchdog)을 제안하며, 관제시스템의 구현 및 실험을 진행하였다. 사례 연구로 Ropsten과 Ganache를 활용한 사설 네트워크에서 실험을 진행하였으며, 실시간 정보수집과 대시보드와 그래프, 차트를 활용한 시각화를 볼 수 있었다. 우리는 Blockchain Watchdog을 통해 블록체인 거버넌스의 생태계 유지와 발전에 기여할 것이라 기대한다.

• 한국컴퓨터정보학회:학술대회논문집
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• 한국컴퓨터정보학회 2019년도 제59차 동계학술대회논문집 27권1호
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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.

• 예술인문사회 융합 멀티미디어 논문지
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• 제9권9호
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• pp.819-831
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• 2019

현대에 거래되는 재화의 종류는 소비형태의 변화에 의해 급속도로 많아지고 있다. 그러나, 거래되는 재화의 종류가 많아진 만큼 이에 대한 정확한 가치판단이 흐려지는 경우가 발생한다. 미술품, 창작물 등의 재화는 소비자가 올바른 가치를 판단하기 어렵다는 단점이 크게 부각되고, 거래 형태 또한 다양하여 이에 대한 신뢰성을 보장받기 힘들다는 문제가 발생한다. 다양한 재화에 대한 접근성이 확대된 현재, 이러한 단점들은 공유경제 시장의 안정성을 저해하는 요인으로 꼽힌다. 본 논문에서는 이러한 문제점을 해결하기 위하여 신뢰성 있는 중개인을 통한 블록체인 기반의 재화 계약 서비스를 제안한다. 제안한 서비스는 이더리움 블록체인에서 동작하는 스마트 컨트랙트를 사용하여 신뢰성 있는 중개인을 등록하고 재화의 가치검증 및 계약 과정에 사용한다. 또한 재화의 등록 내용, 제안 및 계약 과정을 블록체인에 등록하여 계약 과정의 신뢰성을 보장한다. 모든 동작 과정은 스마트 컨트랙트에 등록되고, 이더리움 블록체인의 트랜잭션 히스토리에 저장되므로, 등록된 데이터의 신뢰성을 보장할 수 있다. 또한 등록, 제안 및 계약의 전 과정이 스테이트 머신 기반의 스마트 컨트랙트에 의해 동작하기 때문에 사용자는 계약 과정을 보다 안전하게 제어할 수 있다.

• International Journal of Computer Science & Network Security
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• 제24권2호
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• pp.155-157
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• 2024

Internet of Things (IoT) integrated with the Blockchain is the state of the art for keen cultivation and agriculture. Recently the interest in agribusiness information is enlarging owing to the fact of commercializing the smart farming technology. Agribusiness information are known to be untidy, and experts are worried about the legitimacy of information. The blockchain can be a potential answer for the expert's concern on the uncertainty of the agriculture data. This paper proposes an Agri-Banana plant system using Blockchain integrated with IoT. The system is designed by employing IoT sensors incorporated with Hyperledger fabric network, aims to provide farmers with secure storage for preserving the large amounts of IoT and agriculture data that cannot be tampered with. A banana smart contract is implemented between farmer peer and buyer peer of two different organizations under the Hyperledger fabric network setup aids in secure transaction of transferring banana from farmer to buyer.

• Journal of Multimedia Information System
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• 제8권1호
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• pp.35-44
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• 2021

The Myanmar rice cycle's existing system is still relying on a third party to manage every rice data information from several organizations. It is inconvenient to supervise simultaneously due to the unreliability of information provided by organizations. Thus, the rice cycle's original data is challenging to be utterly trusted since irresponsible parties can manipulate the current state of information. Moreover, the applied system does not preserve a proper incentive for the involved parties. In this paper, we leverage the Ethereum blockchain to be adopted to tackle the aforementioned issues. The main objective is to build trust between parties in the Myanmar rice cycle system. Our proposed scheme allows customers to check and trace information about the rice cycle information without worrying about the integrity of the data. Furthermore, the authorized parties are also rewarded by the government through Ethereum smart contract features. Eventually, our scheme achieves traceability in the rice chain system and leads to the complete digitization and automation of the rice cycle information.

• 한국멀티미디어학회논문지
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• 제24권8호
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• pp.1044-1058
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• 2021

Tempered electronic contents have multiplied in last few years, thanks to the emergence of sophisticated artificial intelligence(AI) algorithms. Deepfakes (fake footage, photos, speech, and videos) can be a frightening and destructive phenomenon that has the capacity to distort the facts and hamper reputation by presenting a fake reality. Evidence of ownership or authentication of digital material is crucial for combating the fabricated content influx we are facing today. Current solutions lack the capacity to track digital media's history and provenance. Due to the rise of misrepresentation created by technologies like deepfake, detection algorithms are required to verify the integrity of digital content. Many real-world scenarios have been claimed to benefit from blockchain's authentication capabilities. Despite the scattered efforts surrounding such remedies, relatively little research has been undertaken to discover where blockchain technology can be used to tackle the deepfake problem. Latest blockchain based innovations such as Smart Contract, Hyperledger fabric can play a vital role against the manipulation of digital content. The goal of this paper is to summarize and discuss the ongoing researches related to blockchain's capabilities to protect digital content authentication. We have also suggested a blockchain (smart contract) dependent framework that can keep the data integrity of original content and thus prevent deepfake. This study also aims at discussing how blockchain technology can be used more effectively in deepfake prevention as well as highlight the current state of deepfake video detection research, including the generating process, various detection algorithms, and existing benchmarks.

• 대한안전경영과학회:학술대회논문집
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• 대한안전경영과학회 2012년 춘계학술대회
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• pp.43-59
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• 2012

As contemporary building construction type is getting higher and deeper,construction equipment usage is getting more, and related fatal accidents are on an increasing trend. In these days, due to the deteriorating construction business circumstance, job finding problem of equipment operator, and dumping contract, equipment lease suppliers are putin jeopardy. In high-rise building construction, especially tower crane, mobile elevated work platform and other High place operation cars among construction equipment cause many critical accidents because of drop supply of construction biding bringing out dumping contract could cause unsafe and poor construction management. Because of this, a method was drawn which could grasp the present state of construction equipment management and manage safety of the equipment more easily for accident prevention by choosing 2 kinds of Construction equipment which cause safety accident frequently among the equipment mainly used in construction site. This study suggested a method about construction equipment safety management using "smart phone" base which could be used in safety management for construction equipment by whomever in construction site. After attachment of QR code included safety checklist, It became possible that site managers could check more efficiently by scanning with their smart phone when they inspect equipment. Moreover, by the construction interested who didn't know what and how they have to inspect could point out unsafe condition in the early stage of equipment entering or take unsafe one out of the site by using new smart phone safety checking system is installed, it became possible that critical accident caused by construction equipment was prevented in advance.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제17권3호
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• pp.916-937
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• 2023

Most of the existing Distributed Denial-of-Service mitigation schemes in Software-Defined Networking are only implemented in the network domain managed by a single controller. In fact, the zombies for attackers to launch large-scale DDoS attacks are actually not in the same network domain. Therefore, abnormal traffic of DDoS attack will affect multiple paths and network domains. A single defense method is difficult to deal with large-scale DDoS attacks. The cooperative defense of multiple domains becomes an important means to effectively solve cross-domain DDoS attacks. We propose an efficient multi-domain DDoS cooperative defense mechanism by integrating blockchain and SDN architecture. It includes attack traceability, inter-domain information sharing and attack mitigation. In order to reduce the length of the marking path and shorten the traceability time, we propose an AS-level packet traceability method called ASPM. We propose an information sharing method across multiple domains based on blockchain and smart contract. It effectively solves the impact of DDoS illegal traffic on multiple domains. According to the traceability results, we designed a DDoS attack mitigation method by replacing the ACL list with the IP address black/gray list. The experimental results show that our ASPM traceability method requires less data packets, high traceability precision and low overhead. And blockchain-based inter-domain sharing scheme has low cost, high scalability and high security. Attack mitigation measures can prevent illegal data flow in a timely and efficient manner.

• 한국컴퓨터정보학회논문지
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• 제23권12호
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• pp.49-55
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• 2018

In this paper, we propose schemes of blockchain utilization in tactical communication environment. The military tactical communication environment has similar characteristics with blockchain network such as distributed architecture, decentralization, and the need for data integrity. A communication node constituting a tactical communication network is constituted by a system capable of configuring and connecting a network for each node. When a communication node, having such capabilities, is configured as a node of blockchain network, various functions could be performed. In this paper, we propose utilization schemes of authentication, integrity, record management, and privilege control based blockchain technology. Functions for authentication, integrity verification, and record management need to ensure the stored data and could track history. The requirement of function's characteristics are matched to blockchain which is storing data sequentially and difficult to hack data, so that it could perform functionally and sufficiently well. Functions for authority control should be able to assign different privileges according to the state of the requestor. Smart contract will function when certain conditions are satisfied and it will be able to perform its functions by using it. In this paper, we will look over functions and utilization schemes of blockchain technology which could reliably share and synchronize data in a tactical communication environment composed of distributed network environment.