• Journal of the Korea Institute of Information Security & Cryptology
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• v.28 no.6
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• pp.1319-1328
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• 2018

A blockchain system developed for crypto-currency has attractive characteristics, such as de-centralization, distributed ledger, and partial anonymity, making itself adopted in various fields. Among those characteristics, partial anonymity strongly assures privacy of users, but side effects such as abuse of crime are also appearing, and so countermeasures for circumventing such abuse have been studied continuously. In this paper, we propose a machine-learning based method for classifying smart contracts in Ethereum regarding their functions and design patterns and for identifying user behaviors according to them.

• Journal of the Korea Society of Computer and Information
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• v.11 no.1 s.39
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• pp.223-235
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• 2006

Textile industry of Korea has been assumed advanced textile industry nation's aspects with production system and equipment. But has been descended in the sector of design, brand, recognition comparing with Italy, Japan, England. And products of middle and low price do not have competitiveness against China, South East Asia. The world's textile industry nation has been confronted with Free Trade, and Regional Trade Blocks. New market has been opened with free Trade, but Trade Blocks(NAFTA, EU, APEC etc.) which encourage regional member country's profit maximize made textile export driven nation to consider strategies to cope with. Advanced textile industry nation divided the work among themselves and composed linking system among them which highly valuable products are manufactured at advanced nation and low price products are manufactured by global outsourcing. The purpose of this study is to analyze impact of process which requires to secure international competitiveness into business performance experimentally.

• Journal of Broadcast Engineering
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• v.25 no.6
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• pp.922-934
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• 2020

The talent trading platform is a platform that brokers transactions such as program coding, media content production (video, music, presentation materials, etc.), design, learning, and repair. Existing talent trading platforms provide a server-client model-based service, which incurs server operating costs and arbitration labor costs for transactions, which has a disadvantage that users bear high service fees. This paper proposes a method to reduce server and database operation costs by uploading transaction information to blocks through the system as a distributed app (dApp) based on the Ethereum platform. In addition, it proposes a method to lower transaction fees by reducing the labor cost of transaction arbitrators through smart contracts. Compare and analyze the cost processing procedure and transaction fee size of the blockchain-based talent trading platform and the existing talent trading platform.

• Journal of Digital Convergence
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• v.19 no.11
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• pp.463-470
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• 2021

Due to natural and human factors, dunhuang frescoes in China have gradually degenerated. China has conducted digital transformation of frescoes since 1990. However, it requires expensive research costs. Most of the visitors passively accept transformation contents and lack subjective participation. The paper focuses on produces a prototype of Dunhuang frescoes on the CoSpaces EDU. It was implemented as a metaverse through procedures such as transforming the cave into 3D, mapping images to the cave model and developing CoBlocks. The research puts forward a more specific methodology without expensive costs of development. The paper makes it easier to realize the immersive and interactive virtual Dunhuang frescoes world, to improve the tourism contents and educational effect. This research carries on the statistics to the product result which develops according to the user experience of 100 different ages, has obtained the good feedback. The research results need to be improved is to strengthen the processing of graphic details. Therefore, Optimization and improvement of the result will be carried out in the future research.

• The Korean Journal of Applied Statistics
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• v.14 no.1
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• pp.59-70
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• 2001

이면교배 실험은 식물이나 동물의 교배를 통해 자식계통의 유전적인 성질을 조사하는데 중용한 역할을 한다. 이면교배에 관한 기존의 연구에서는 p개의 자식계통은 하나의 집합에 속하는 것으로 간주하였다. 이와 달리 새로 육성된 자식계통의 유전적 성질을 평가하고자 하는 경우에는, p개의 자식계통이 각각 p$_1$과 p$_2$개의 자식계통을 갖는 두 개의 집합으로 분리되는 형태의 교배실험을 사용한다(단, p=p$_1$+p$_2$). 이에 본 연구에서는 자식계통이 두 집단으로 분리된 경우에 대해서 Kempthorne의 합동식을 이용하여 두 군간 교배에 대한 블록디자인을 설계하고, 이에 대한 평균효율인자를 계산하는 방법을 제안하고자 한다.

• Journal of the Korea Society of Computer and Information
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• v.27 no.4
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• pp.9-17
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• 2022

The state-of-the-art AI systems pose many ethical issues ranging from massive data collection to bias in algorithms. In response, this paper proposes a more ethic-friendly AI architecture by combining Federated Learning(FL) and Blockchain. We discuss the importance of each issues and provide requirements for an ethical AI system to show how our solutions can achieve more ethical paradigms. By committing to our design, adopters can perform AI services more ethically.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.04a
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• pp.1474-1477
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• 2009

본 논문에서는 ASR(Arithmetic Shift Register)과 SHA-2로 구성된 32비트 출력의 새로운 스트림 암호 ASC를 제안한다. ASC는 소프트웨어 및 하드웨어 구현이 쉽게 디자인된 스트림 암호 알고리즘이다. 특히 계산능력이 제한된 무선 통신장비에서 빠르게 수행할 수 있도록 개발되었다. ASC는 다양한 길이(8-32바이트)의 키를 지원하고 있으며, 워드 단위로 연산을 수행한다. ASC는 매우 간결한 구조를 가지고 있으며 선형 궤환 순서기(Linear Feedback Sequencer)로 ASR을 적용하였고, 비선형 순서기(Nonlinear sequencer)로 SHA-2를 적용하여 크게 두 부분으로 구성되어 있는 결합 함수(combining function) 스트림 암호이다. 그리고 8비트, 16비트, 32비트 프로세스에서 쉽게 구현이 가능하다. 제안한 스트림 암호 ASC는 최근에 표준 블록 암호로 제정된 AES, ARIA, SEED등의 블록 암호보다는 6-13배 빠른 결과를 보여주고 있으며, 안전성 또한 현대 암호 알고리즘이 필요로 하는 안전성을 만족하고 있다.

• The Journal of the Korea Contents Association
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• v.22 no.9
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• pp.179-193
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• 2022

Amid the explosive growth of various metaverse platforms, there is no unified indicator to measure, analyze, and evaluate based on customer experience. Therefore, the usability evaluation factors in metaverse were identified through a heuristic methodology and literature review, to evaluate the metaverse, a two-to three-dimensional virtual world platform. A measurable system was established by subdividing 20 items in 5 fields, including user control, information structure, design and content, and usage environment, derived through Delphi technique. Based on this, after experiencing the actual contents of major metaverse platforms such as Roblox and Zepeto, usability was evaluated and comparative verification was conducted. As a result, it was estimated that metaverse user experience could be improved as its utility was derived relatively high in terms of user control and content. This study constitutes a theoretical contribution by extending the usability evaluation system, which has been widely used in the field of service design, to the fields of extended reality and mixed reality. At the same time, it has practical key findings of providing basic judgment standards to stakeholders in the metaverse field, as well as policy implications for digital capability enhancement and industry revitalization.

• Journal of IKEEE
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• v.25 no.3
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• pp.473-478
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• 2021

Although CNTFETs have attracted great attention due to their ability to increase semiconductor device performance by about 13 times, the commercialization of CNTFETs has been challenging because of the immature deposition process of CNTs. To overcome these difficulties, circuit design method considering the known limitations of the CNTFET manufacturing process is receiving increasing attention. SRAM is a major element constituting microprocessor and is regularly and repeatedly positioned in the cache memory; so, it has the advantage that CNTs can be more easily and densely deposited in SRAM than other circuit blocks. In order to take these advantages, this paper presents a circuit design method for SRAM cells considering CNT density and then evaluates its performance improvement using HSPICE simulation. As a result of simulation, it is found that when CNTFET is applied to SRAM, the gate width can be reduced by about 1.7 times and the read speed also can be improved by about 2 times when the CNT density was increased in the same gate width.

• Proceedings of the Korean Institute of Interior Design Conference
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• 2004.05a
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• pp.56-59
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• 2004

The purpose of this study is to clarify the relationship between the behavior of appreciation and spatial configuration in museum, to concentrate upon the difference that is happened according to composition method of convex space. The subject of this study are as follows: 1) The change of spatial configuration by specialization from architectural space to exhibition space in museum. 2) The variety of spatial configurations that is happened according to connectivity condition of the spatial configuration 3) The relationship between the size of convex space and the behavior of appreciation