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ZigBee 무선 센서 네트워크에서의 안전한 키 분배 프로토콜
오수민(Su-min Oh),최수경(Soo-kyeong Choi),권예진(Ye-jin Kwon),박창섭(Chang-seop Park) 한국정보보호학회 2012 정보보호학회논문지 Vol.22 No.4
본 논문에서는 ZigBee-2007 표준 명세서에 포함된 키 분배 프로토콜의 문제점을 지적하고 이에 대한 개선안을 제시한 Yuksel-Nielson 기법이 키 비동기화 공격에 취약함을 보인다. 또한, Yuksel-Nielson 기법을 개선한 새로운 키 분배 프로토콜을 제안하고 이에 대한 안전성 및 성능분석을 통해서 본 논문에서 제안하는 키 분배 프로토콜의 유효성을 검증한다. It is shown in this paper that Yuksel-Nielson"s key distribution scheme is not secure against key de-synchronization attack even though their scheme supplement ZigBee-2007 specification"s security problems. Furthermore, a new key distribution scheme is proposed, which is the one to fix the security weakness of Yuksel-Nielson"s scheme, as well as its security and performance analysis to verify its effectiveness.
건축재료 관점에서 성능중심의 건축기준 표준화 방안 도출을 위한 기초적 연구
노태임(Roh Tae-Im),김상헌(Kim Sang-Heon),최수경(Choi Su-Kyeong),지석원(Ji Suk-WonK),서치호(Seo Chee-Hol) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.3
This study focuses on applying performance-based design to building codes. It provides the formulated categorization method by investigating and analyzing the factors to establish performance-based building codes, and deduces performance requirement by extracting a requirement condition and performance item. Also, after quantitating evaluation items and methods for performance requirement and analyzing, it classifies the performance requirement and provides the process which is available to establish the performance criteria. As a results, this study analyzes and confirms the problems of building codes. Also, it proposes that description of performance requirement should be divided into the primary performance which is available to quantitative estimate and the secondary performance available to qualitative estimate. In addition, it proposes that the necessity of the change of the management system and the shortening of revision time was present of Korean Architectural Standard Specification.
경량골재의 공극구조와 흡수특성에 따른 경량골재콘크리트 특성 평가 연구
박대오(Park Dae-Oh),사순헌(Sa Soon-Heon),김상헌(Kim Sang-Heon),지석원(Ji Suk-Won),최수경(Choi Su-Kyeong),서치호(Seo Chee-Ho) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.3
Lightweight aggregate mainly consist of multi-crystalline structure and has many internal pores. It may be abnormal water moving in lightweight aggregate on account of the change of external circumstance. The abnormal water moving is influenced by distribution, shape, size and prewetting and each factors considerably control it. Recently, in domestic and foreign construction industry, lightweight aggregate is delivered from factory with controlling lightweight aggregate's water absorption to improve workability. But, unfortunately, there are few studies about workability and mechanical property which is influenced by controlling the percentage of water absorption. In this study, we analyzed the pore system and water absorption characteristic of domestic and foreign lightweight aggregate. And that acquired the experimental data about mechanical properties and frost resistance of lightweight aggregate concrete according to the pore system and water absorption characteristic, makes a good use of lightweight aggregate concrete.
알칼리 활성화 반응에 의한 고로슬래그 경량골재 콘크리트의 실험적 연구
위준우(We Joon-Woo),김세환(Kim Se-Hwan),김상헌(Kim Sang-Heon),지석원(Ji Suk-Won),최수경(Choi Su-Kyeong),서치호(Seo Chee-Ho) 대한건축학회 2010 大韓建築學會論文集 : 構造系 Vol.26 No.9
In this study, the strength characteristic of lightweight aggregate concrete made of BFS hardening by chemical reaction of alkali activate admixture was analysed and the results are as below. Air content and slump value appeared decrease by increasing the amount of alkali activate admixture and replacement of Meta Kaolin(MK). It is considered that the decrease is because of increase of the binder granular amount and high fineness of MK. Proportion design by replacement ratio of alkali activate admixture needs more studies for improving workability. The compressive strength was measured over 28MPa at age 28days when 0%, 10%, 20% of MK replacement. This confirms the possibility of use of alkali-activated lightweight concrete as lightweight concrete. And as MK reacted with more amount of alkali activate admixture than BFS, the optimum mix proportion of alkali activate admixture needs to be established for improving compressive strength.