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Centralized Trust-Based Secure Routing in Wireless Networks
Yun, Jusik,Seo, Sunho,Chung, Jong-Moon IEEE 2018 IEEE wireless communications letters Vol.7 No.6
<P>Wireless networks are vulnerable to various network attacks. To cope with these security issues, trust-based routing schemes have emerged. Typically, trust routing schemes are mainly focused on detection of packet drop attacks, because this type of an attack is simple and obviously a malicious behavior. However, there are more advanced attacks, such as false trust reporting or compromised attacks, where trust-based routing to defend these attacks is more difficult because of their ambiguous behavior. In order to ensure data transmission reliability even against such attacks, in this letter, a centralized trust based secure routing (CSR) scheme is proposed for wireless networks. Simulation results show that the CSR scheme provides better performance compared to the active trust routing and shortest path routing schemes.</P>
( Jusik Yun ),( Yunyeong Goh ),( Jong-moon Chung ),( Okseok Kim ),( Sangwoo Shin ),( Jin Choi ),( Yoora Kim ) 한국인터넷정보학회 2019 KSII Transactions on Internet and Information Syst Vol.13 No.8
Proof of Work (PoW) based blockchains have limitations in throughput, time consumption, and energy efficiency. In these systems, a miner will consume significant time and resources to obtain a reward for contributing to the blockchain. To overcome these limitations, recent research on blockchains are focused on accelerating the speed, scalability, and enhancing the security level. By enhancing specific procedures of blockchain system, the level of data integrity supported by the blockchain can become more robust, and efficient. In this paper, a new blockchain consensus model based on the Bryllite Consensus Protocol (BCP) is proposed to support a hyper-connected massively multiplayer online game (MMOG) ecosystem. The BCP scheme enables users to participate directly in new consensus processes through a Proof of Participation (PoP) algorithm. In this model, the consensus algorithm has a simpler form while maintaining high security level. In addition, because the BCP scheme gives users an equal chance to make a contribution to the blockchain, rewards are distributed in an equal fashion, which motivates user participation. The analysis of the proposed scheme is applied to the Bryllite consortium blockchain system (homed in Hong Kong), which is a new blockchain network developed for international game industries, gamers, and game events.
국내 BIM 발주 건축 현상공모경기의 Green BIM Data 활용 현황 분석
이주식(Jusik Lee),추승연(Seung-Yeon Choo),이권형(Kweon-Hyung Lee),류정림(Jung-Rim Ryu),이윤정(Yun-Jeong Lee) (사)한국CDE학회 2015 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2015 No.동계
The necessity for Eco-friendly Low-Carbon Design technology has been emphasized by the government and scholars since the crisis of environmental problem. BIM is a great technology for Low-Carbon Design in architecture. The architectural competitions in Korea have a limitation on the way of evaluation because it’s just evaluate by the checklists and not consider for the architecture design elements. The guidelines for BIM in competition not using BIM data for energy performance simulation but just for viewing and checking models. For this reason, this study analyzed the BIM architectural competition guidelines within the framework of BIM data utilization. Purpose of this study is to measure the possibility of BIM data to be using for eco-sector assessment through energy performance simulation. First, this research analyze guidelines of 4 architectural competitions. Second, draw eco-sector assessment elements of those BIM competition. Third, measure the possibility for energy performance simulation based BIM data utilization.
항온실험에서 왕겨 바이오차와 바이오차 펠렛의 시용수준에 따른 토양 이화학성 변화평가
이승규(Seunggyu Lee),김소희(Sohui Kim),박재혁(Jaehyuk Park),윤진주(Jinju Yun),강세원(Sewon Kang),조주식(Jusik Cho) 한국토양비료학회 2021 한국토양비료학회 학술발표회 초록집 Vol.2021 No.11
최근 바이오차의 토양개량 역할과 유기물질의 공급원으로 각광받기 시작하면서 바이오차를 농경지에 적용하는 사례가 늘어나고 있다. 이에 따라 다양한 농경지 조건의 항온실험을 통하여 토양의 화학적 특성 변화를 관찰하기 위하여 연구를 진행하였다. 실험에 사용된 농경지별 토양은 일반 밭토양(U), 시설재배지 토양(G), 개간토양(C), 간척지 토양(R)을 사용하였고, 모든 처리구에 관행시비량인 퇴비 540 kg 10a<SUP>-1</SUP>, N-P-K: 32-7.8-19.8 kg 10a<SUP>-1</SUP>의 수준으로 시비하였다. 바이오차는 왕겨 바이오차(R)와 바이오차 펠렛(P)을 사용하여 비교하였으며, 바이오차 펠렛의 함량조성은 나무숯30%+가공계분50%+쌀겨10%+왕겨숯 10%의 비율로 제조되었고, 왕겨바이오차와 바이오차 펠렛 시용수준은 0, 5, 10, 20 t ha<SUP>-1</SUP>의 수준으로 적용하여 처리구를 완성하였다. 이 항온실험은 40일 간 진행되었으며, 실험 중 인큐베이터 안의 온도는 25 °C, 수분보수력(WHC) 70% 수준을 유지하여 진행하였다. 항온실험 전 토양과 40일 후 토양의 화학성을 비교한 결과 토양의 pH는 대부분 왕겨 바이오차 처리구보다 바이오차 펠렛 처리구에서 더 높이 증가하는 경향을 보였고, 일반 밭토양의 pH는 바이오차 시용수준 차이에 따라 증가하였으나(+0.49 ~ +1.47), 시설재배지토양, 개간토양, 간척지토양에서는 전부 감소하였다 (–0.08 ~ –1.38). 유기물 함량은 일반 밭토양 UP20 처리구에서 38%, 시설재배지 GP10 처리구 26%, 개간토양 CR20 처리구에서 21%, 간척지 RP5 처리구에서 32%까지 증가하였다. 항온실험 결과 왕겨 바이오차보다는 바이오차 펠렛에서 토양 개량효과가 더욱 증가하였고, 바이오차의 함량이 10, 20 t ha<SUP>-1</SUP> 의 시용수준에서 토양개량 효과가 더욱 높아진다고 판단된다.