• Journal of the Korea Institute of Information and Communication Engineering
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• v.22 no.5
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• pp.812-817
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• 2018

Blockchain technology removes the central system and connects each block throughout every person. This paper proposes new method to exploit the blockchain feature to apply existing donation system. In the current system, the donator does not donate to poor neighbor which means donator must have to donate some donate organization. The donator does not recognize how the donation has been spent after donation. In this case, we can solve that problem by using the blockchain where the donator can watch how the money works and everyone can browse the account history. To make a virtual fundraising box based on blockchain technology, donator sends some money at virtual account and exchanges the money to crypto-currency. Donator can use crypto-currency which is donate to poor neighbor that poor neighbor can exchanges crypto-currency to the money. Through this proposed system, the donation is managed by secure and transparent blockchain system.

• Journal of the Korea Society of Computer and Information
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• v.26 no.12
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• pp.99-104
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• 2021

Blockchain technology is a distributed ledger technology that shares the ledger between multiple nodes connected to a distributed network. The data managed through the existing central server is managed through the blockchain, and the transparency, accuracy, and integrity of the transaction data is increased, and the need for data management through the blockchain is increasing. In this paper, recognizing the need for trust-based data sharing between trust-based institutions in the financial industry, this paper describes the process of selecting leader nodes in Raft, a private blockchain consensus algorithm, as a way to increase data management efficiency through blockchain. A modified consensus algorithm is presented. The performance of the modified consensus algorithm and the general Raft consensus algorithm presented in this paper was compared and analyzed based on the transaction processing time, and it was confirmed that the efficiency of the consensus process was increased by applying the proposed consensus algorithm.

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.40 no.6
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• pp.5-11
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• 2011

콜드체인(cold chain)의 최종단계로 제품과 소비자를 연결시키는 냉동/냉장 쇼케이스는 대형마트나 슈퍼마켓의 대표적인 에너지 다소비 기기이다. 쇼케이스가 소비하는 에너지를 감소시키는 기술은 오랫동안 관련 엔지니어들의 관심 대상이었다. 본 원고에서는 ASHRAE Journal에 게재되었던 냉동/냉장 쇼케이스의 에너지 절약 및 회수에 관한 북미의 연구사례를 소개하고자 한다.

• Journal of Korean Electronics
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• v.29 no.3
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• pp.11-14
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• 2009

세계적으로 성공한 게임기업체인 닌텐도는 2008년 회계연도 연결결산에서 영업이익을 5300억엔(약 8조 1620원)으로 전망했다. 2007년에 비해 엔화상승 탓에 애초 전망치 6300억엔에는 못 미쳤지만 8.8%나 증가했다. 역대 최대의 흑자 기록을 세웠다. 글러벌 금융 위기로 대부분의 기업은 실적 악화에 고민했지만 일본의 게임기 업체인 닌텐도는 알찬 기업의 대명사로 떠올랐다.

• Annual Conference on Human and Language Technology
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• 2010.10a
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• pp.172-176
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• 2010

본 논문에서는 위키피디아의 '틀(temp late)'을 기조로 하여 작성된 온톨로지인 OntoCloud의 신뢰도를 보장하고 공유 및 재사용을 가능하게 하기 위하여 또 다른 어휘집합체인 워드넷(WordNet)과의 매핑을 한다. 온톨로지 매핑 기술은 온톨로지 개발 기술의 한 방법으로, 서로 비슷한 도메인을 대상으로 이미 구축되어진 서로 다른 다수의 온롤로지를 연결시킴으로서 하나의 풍부한 정보를 가지고 있는 연결망을 구축하는 방법이다. 본 논문에서는 OntoCloud와 워드넷을 두개의 온톨로지로 정의하고 각 온톨로지의 개념에 대한 정의문 비교 방법을 통해서 두개의 온톨로지에 존재하는 유사한 개념을 연결한다. 이렇게 매핑된 정보들은 OntoCloud 개념을 워드넷 어휘로 연결함으로써 개념에 대한 직관적인 이해를 돕고, 워드넷에 연결된 다른 시소러스 (예: SUMO, CoreNet 등)와 간접적으로 연결할 수 있는 틀을 마련한다. 또한 온톨로지의 상하위 계층정보를 자동으로 보강하는 등의 OntoCloud 유지보수에 활용될 수 있다. 본 논문의 실험에서는 두개의 서로 다른 온톨로지의 정의문에 사용된 어휘의 겹침 정도로 두개의 개념의 유사성을 판별하는 방법을 보인다. 본 논문에서 제시한 방법으로 약 73%의 개념 매핑에 성공하였으나, 추후 매핑 프로세스의 전처리 과정(약자 처리 및 복합명사 대응 모듈)을 추가하고 온톨로지의 구조적 특성을 활용하여 유사 개념 자동 매핑 기술을 향상시키고자 한다.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.11 no.5
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• pp.550-555
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• 2018

This study aims to identify and compare contents and keywords used in articles related to blockchain applications to various industries. The text mining and Semantic Network Analysis, as methods of keyword network analysis, were used to analyze articles including terms of 'finance' 'energy' and 'logistics', which media and government frequently mentioned as areas that can apply blockchain technologies. For this study, data were collected from 43,093 articles from January, 2017 through July, 2018. Data crawling was carried out by using Python BeautifulSoup and data cleaning was performed in order to eliminate mutual redundancies of the three terms. After that, text mining and semantic network analysis were performed using Textom and UCInet for network analysis between keywords. The results showed that all the three terms were similar in terms of 'technology', but there were differences in the contents of 'government policy' or 'industry' issues. In addition, there were differences in frequencies and centralities of these terms.

• Journal of the Korea Convergence Society
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• v.11 no.4
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• pp.33-39
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• 2020

Interest in 5G communication security has been growing recently amid growing expectations for 5G technology with faster speed and stability than LTE. However, 5G has so far included disparate areas, so it has not yet fully supported the issues of security. This paper proposes a blockchain-based IoT management model in order to efficiently provide the authentication of users using IoT in 5G In order to efficiently fuse the authentication of IoT users with probabilistic theory and physical structure, the proposed model uses two random keys in reverse direction at different layers so that two-way authentication is achieved by the managers of layers and layers. The proposed model applied blockchain between grouped IoT devices by assigning weights to layer information of IoT information after certification of IoT users in 5G environment is stratified on a probabilistic basis. In particular, the proposed model has better functions than the existing blockchain because it divides the IoT network into layered, multi-layered networks.

• Journal of Broadcast Engineering
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• v.23 no.5
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• pp.701-713
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• 2018

The purpose of this paper is to analyze the changes of the digital music platforms and digital profit distribution issues which are considered to be the most important part of the application to the Global music industry based on the block chain system. This attempt is not to reveal the success of the block chain and the value judgment in the societies that will come in the future. How to apply the original function of the block chain in the field of the music industry, which has changed a lot in the digital era, this paper focused on what we need to work on. First, I will briefly review the structure and major functions of the block chain system and the crypto-currency, and examine the link between the blockchain and the music industry. In addition, I will focus on some overseas' cases that are actually applied, and examine the possibility of applying them in the domestic music industry. Through this, I expect that this article will become a cornerstone for discussing the development direction of the music industry, especially the Korean music industry, which is constantly changing due to the technological advancement process.

• The Journal of the Korea Contents Association
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• v.20 no.5
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• pp.11-22
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• 2020

The academic credit banking system is an educational system to implement a lifelong learning society. Students who meet the requirements of this system can achieve academic degrees equivalent to those of junior colleges or four-year universities. Credits and degree information of these students are recorded and managed by the central institution. However, this system can cause security problem such as hacking due to centralized management. In this paper, we propose an academic credit banking system which can manage credits and degree information based on blockchain technology. In the proposed system, credits and degree information are stored in block and managed in the public ledger in a permanent manner. Blocks are connected in the form of blockchain on a distributed network to improve security problems such as hacking and manipulation. Also, the efficiency of credit bank management can be increased because the functions of the central institution are distributed to the network participants. The prototype of the proposed system was implemented on the Go-Ethereum platform and experimentally verified the blockchain information among participating organizations using smart contracts.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.18 no.5
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• pp.161-169
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• 2018

This study presents a time synchronization system in decentralized structure by using the blockchain, a core technology of Bitcoin introduced by Satoshi Nakamoto in 2008. In this study, Getting away from existing time synchronization system in centralized structure, A blockchain network has completely decentralized structure using public blockchain. In decentralized structure, Only certain peers among the peers that participate in a blockchain network access the NTP server. Therefore, others can synchronize time without having to go to public network. Furthermore if appropriate time synchronization cycles are established for each peer, time synchronization can be maintained even when connection to public network is completely lost. A time synchronization system in this study has advantages of p2p system and can be also guaranteed reliability and stability because it used digital signature, merkle tree, consensus algorithm which are core characteristics of block chains.