• Title, Summary, Keyword: Block Chain

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A Basic Study of Construction Procurement Management using Block Chain & Big Data Technology (블록체인과 빅데이터 기술을 이용한 건설 조달 관리 기초 연구)

  • Kim, Ki-Ho;Son, Seung-Hyun;Kim, Sun-Kuk
    • Proceedings of the Korean Institute of Building Construction Conference
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    • pp.127-128
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    • 2019
  • The cost of procurement in construction projects varies depending on the type of project, but the proportion of the cost component is very large. Therefore, efficient procurement system operation affects the success of the project. However, difficulties arise in procurement management due to problems such as availability of data due to limited information, inaccurate scheduling and integration of costs. Therefore, the purpose of this study is to develop a procurement management system to help efficient communication decision by combining Big Data which can analyze a lot of information and Block Chain technology which can secure information and record reliability to satisfy the above requirements. The results of this study are used to develop a system to develop academically improved procurement management system and practically to develop a system to secure business competitiveness and to facilitate rapid communication among project participants.

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The Organization of Nanoporous Structure Using Controlled Micelle Size from MPEG-b-PDLLA Block Copolymers

  • Chang, Jeong-Ho;Kim, Kyung-Ja;Shin, Young-Kook
    • Bulletin of the Korean Chemical Society
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    • v.25 no.3
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    • pp.351-356
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    • 2004
  • Selected MPEG-b-PDLLA block copolymers have been synthesized by ring-opening polymerization with systematic variation of the chain lengths of the resident hydrophilic and hydrophobic blocks. The size and shape of the micelles that spontaneously form in solution are then controlled by the characteristics of the block copolymer template. All the materials prepared in this study showed the tunable pore size of 20-80 ${\AA}$ with the increase of hydrophobic chain lengths and up to 660 $m^2$/g of specific surface area. The formation mechanism of these nanoporous structures obtained by controlling the micelle size has been confirmed using both liquid and solid state $^{13}C\;and\;^{29}Si$ NMR techniques. This work verifies the formation mechanism of nanoporous structures in which the pore size and wall thickness are closely dependent on the size of hydrophobic cores and hydrophilic shells of the block copolymer templates.

Security Model Tracing User Activities using Private BlockChain in Cloud Environment (클라우드 환경에서 프라이빗 블록체인을 이용한 이상 행위 추적 보안 모델)

  • Kim, Young Soo;Kim, Young Chan;Lee, Byoung Yup
    • The Journal of the Korea Contents Association
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    • v.18 no.11
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    • pp.475-483
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    • 2018
  • Most of logistics system has difficulties in transportation logistics tracking due to problems in real world such as discordance between logistics information and logistics flow. For the solution to these problems, through case study about corporation, suppliers that transport order items in shopping mall, we retain traceability of order items through accordance between logistics and information flow and derive transportation logistics tracking model. Through literature review, we selected permissioned public block chain model as reference model which is suitable for transportation logistics tracking model. We compared, analyzed and evaluated using centralized model and block chain as application model for transportation logistics tracking model. In this paper we proposed transportation logistics tracking model which integrated with logistics system in real world. It can be utilized for tracking and detection model and also as a tool for marketing.

A Study on the 4th Industrial Revolution and Block Chain Electronic Government -In terms of the prevention of cybercrimes and corruption- (제4차 산업혁명과 블록체인 전자정부에 대한 연구 -사이버범죄와 사이버부패방지 측면에서-)

  • Lee, Sang-Yun;Yoon, Hong-Joo;Seo, Won-Chan
    • The Journal of the Korea institute of electronic communication sciences
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    • v.14 no.1
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    • pp.11-18
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    • 2019
  • This paper explores desirable status of block chain electronic government in relation to the prevention of cybercrimes and corruption. After the research, we suggest four measures to establish desirable status of block chain electronic government. Eventually, transparency is ensured thanks to the core concept of block chain technology, sharing, not only allowing all of the participants to share information and but also preventing them from forging or falsifying information. Furthermore, a wide variety of participants can play a role as monitors in the horizontal structure of governance system, which also assures credibility and reliability on electronic government through trust on block chain itself. Electronic government aims at virtue of expanded electronic democracy which strengthens information democracy. Also, establishment of electronic governance, that emphasizes networking and guarantees, is a desirable image of the future of the fourth industrial revolution. Therefore, the establishment of future electronic government according to the four principles drawn from this paper can be the most suitable model.

Biased hooking for primitive chain network simulations of block copolymers

  • Masubuchi Yuichi;Ianniruberto Giovanni;Marrucci Giuseppe;Greco Francesco
    • Korea-Australia Rheology Journal
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    • v.18 no.2
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    • pp.99-102
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    • 2006
  • Primitive chain network model for block copolymers is used here to simulate molecular dynamics in the entangled state with acceptable computational cost. It was found that i) the hooking procedure rearranging the topology of the entangled network is critical for the equilibrium structure of the system, and ii) simulations accounting for the different chemistry, i.e., with a biased hooking probability based on interaction parameter ${\chi}$ for selection of the hooked partner, generates a reasonable phase diagram.

Optimization of Low Power CMOS Baseband Analog Filter-Amplifier Chain for Direct Conversion Receiver

  • Lee, Min-Kyung;Kwon, Ick-Jin;Lee, Kwy-Ro
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.4 no.3
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    • pp.168-173
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    • 2004
  • A low power CMOS receiver baseband analog circuit based on alternating filter and gain stage is reported. For the given specifications of the baseband analog block, optimum allocation of the gain, IIP3 and NF of the each block was performed to minimize current consumption. The fully integrated receiver BBA chain is fabricated in $0.18\;{\mu}m$ CMOS technology and IIP3 of 30 dBm with a gain of 55 dB and noise figure of 31 dB are obtained at 4.86 mW power consumption.

A Study on the Application of Block Chain to Ensure Data Integrity in MANET Environment (MANET 환경에서 데이터 무결성 보장을 위한 블록체인 적용에 관한 연구)

  • Yang, Hwanseok;Choi, Daesoo
    • Convergence Security Journal
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    • v.18 no.5_1
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    • pp.53-58
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    • 2018
  • MANET transmits data by hop-by-hop method because it is composed of mobile nodes without support of any infrastructure. Its structure is very similar to a block chain. However, it is exposed to various threats such as data tampering or destruction by malicious nodes because of transmission method. So, ensuring the integrity of transmitted data is an important complement to MANET. In this paper, we propose a method to apply the block chain technique in order to protect the reliability value of the nodes consisting the network from malicious nodes. For this, hierarchical structure of a cluster type is used. Only cluster head stores the reliability information of the nodes in a block and then, this can be spread. In addition, we applied block generation difficulty automatic setting technique using the number of nodes selecting cluster head and the reliability of cluster head to prevent the spread of wrong blocks. This can prevent block generation and spread by malicious nodes. The superior performance of the proposed technique can be verified by comparing experiments with the SAODV technique.

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Music Industry Using Blockchain Technology: Trends and Future Prospects (블록체인 시스템을 활용한 음악 산업 동향 분석 및 미래가치 전망)

  • Koh, Yunhwa
    • 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.