• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.12 no.3
• /
• pp.485-492
• /
• 2008

Computers used fer light-weight computing environments are considerably limited in resources and performance running in ubiquitous environment. Because of the limited resources, it is difficult to apply existing security technologies to the light-weight computers. In this paper, light-weight security software is implemented using RC-5 encryption and SHA-1 authentication algorithm which is appropriate for light-weight computing environments. The design of components based on security software of a light-weight computer application and the test-bed for security software are presented. The simulation verifies the correctness of the security software. The architecture of the light-weight and reconfigurable security software for light-weight computer applications is proposed. The proposed security software is small size and provides reconfigurable security library based on the light-weight component and the software manager that configures software platform is loaded with the library at the time it is needed.

• Journal of the KSME
• /
• v.51 no.1
• /
• pp.48-52
• /
• 2011

이 글에서는 수송기계의 에너지효율 환경영향성 승객안전성 향상을 위하여 전 세계적으로 연구를 시작하고 있는 초경량 PCM 샌드위치 판재의 개발 및 적용 동향을 소개하고자 한다.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.32 no.4C
• /
• pp.454-461
• /
• 2007

The next-generation computer is the ultra-lightweight mobile computer that communicates with peripheral handhold devices and provides dynamically the services appropriate to user. To provide the dynamic services on the ultra-lightweight mobile computer, security problem for user or computer system information should be solved and security mechanism is necessary for the ultra-lightweight mobile computing environment that has battery limit and low performance. In this paper, the security mechanism on the component based middleware for the ultra-lightweight mobile computer was implemented using RC-5 cipher algorithm and SHA-1 authentication algorithm. The security components are dynamically loaded and executed into the component based middleware on the ultra-lightweight mobile computer.

• Journal of Aerospace System Engineering
• /
• v.18 no.4
• /
• pp.61-69
• /
• 2024

With increasing interest in aviation leisure sports, the demand for ultralight aircraft has increased, highlighting the necessity for robust structural design of the aircraft. In response, this study conducted static structural analysis and free-fall analysis of fuselage frame of ultralight aircraft. Robust design and crashworthiness under operational load conditions and vertical impact scenarios were evaluated by assessing maximum stress and safety factors. Analyses were performed using finite element method-based software ANSYS Workbench. Results including stress distribution and strain were analyzed to verify the safety of the designed fuselage frame. Additionally, this study predicted excessive deformation and failure locations of the fuselage frame during vertical drop impacts.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2004.05a
• /
• pp.64-64
• /
• 2004

최근 복합재료, 신소재 등 다양한 방법을 통해 빔(beam), 바(bar), 패널(panel) 등 초경량 구조재료가 개발되고 있다. 이중 금속 내부구조재를 가진 접합판재(Inner Structured and Bonded panel, ISB panel)은 3차원 형상의 내부구조재가 강성 및 강도를 증가시키는 반면, 부피의 대부분이 비어있어 비강도 및 비강성을 크게 개선시킨다 일반적으로 다양한 트러스 형태의 금속 내부구조물은 허니컴 형상의 내부구조와 유사한 정도로 기계적 특성이 우수하다.(중략)

• Journal of the Korean Recycled Construction Resources Institute
• /
• v.12 no.3
• /
• pp.254-262
• /
• 2024

The demand for high strength and ultra-lightweight materials to incorporate the advanced technology of nanomaterials into the lengthening of structures is continuously increasing. Therefore, based on existing research results and numerous mixing trials, we derived a mix of high strength and ultra-light concrete of a compressive strength of 100 MPa with a unit weight of 18 kN/m³ and a compr essive str ength of 80 MPa with a unit weight of 16 kN/m³ and evaluated their per for mance. In this paper, 108 specimens corresponding to high strength and ultra-lightweight concrete with a compressive strength of 100 MPa under a unit weight of 18 kN/m³, and a compressive strength of 80 MPa under a unit weight of 16 kN/m³ were manufactured, and the bond characteristics were identified by performing a directly tensile tests, and the bond characteristics were evaluated by comparing them with the experimental results and the current design criteria. It was judged that the bond strength calculation formula of ACI-408R and the experimental results were not accurately reflected, so an bond stress equation based on ACI-408R was proposed. The result of the proposed equation was that the deviation was somewhat reduced. In addition, the results of calculating the CEB-FIP model and the modified CMR model using statistical analysis showed slight differences from the experimental results, but considering that the bond behavior is a local behavior, the proposed model appears to explain the bond behavior of high strength and ultra-light concrete as a whole.

• 한국IT서비스학회:학술대회논문집
• /
• 2009.05a
• /
• pp.205-208
• /
• 2009

이 논문에서는 RFID(Radio Frequency IDentification)에 대한 여러 가지 보안위협에 대하여 간단히 알아보고 그에 대응하는 안전한 암호학적 도구(Primitive)에 대하여 알아보겠다. 공개키 암호시스템(PKC, Public Key Cryptosystem)에 사용되는 타원곡선(EC, Elliptic Curve) 암호, NTRU(N-th degree TRUncated polynomial ring) 암호, Rabin 암호 등은 초경량 하드웨어 구현에 적합한 차세대 암호시스템으로서 안전한 RFID 인증서비스 제공과 프라이버시보호를 가능케 한다. 특히, 본고에서는 초경량 키의 길이, 저전력 소모성, 고속구현 속도를 갖는 타원곡선암호의 안전성에 대한 가이드라인을 제공하겠다.

• Cement
• /
• s.191
• /
• pp.43-48
• /
• 2011

최근 고강도화 기술이 발전함에 따라 각국에서는 지역마다 랜드마크로 불리는 건축물들이 자주 등장하는 것을 문헌을 통하여 자주 접한다. 또한 건축물의 거대화 고층화에 따라, 합리적인 설계를 가능하게 하는 콘크리트의 경량화가 새로운 과제로 주목을 받고 있다. 초경량 콘크리트 구조물을 실용화 할 수 있으면 상부구조의 경량화, 지진하중의 저감, 건설기계의 생력화, 기초 부담의 저감 및 기초의 경량화 등에 따라 건설콘스트 에너지 전체의 저감에도 큰 효과가 기대되기 때문이다. 국내에도 경량 골재에 대한 제조가 간헐적으로 계속되어 오고 있다. 특징을 보면 산업부산물을 이용한 친환경소재, 에너지 절감, 흡수율 등을 대폭적으로 낮추었다고 소개되고 있는 반면, 비중을 초경량화한 경우는 거의 없다. 따라서 본 검토는 절건비중이 1.0 미만인 초경량골재를 사용한 경우로 비록 실험실적 결과이지만 쉽게 접할 수 있는 제품이 아닌 것 같아 아소(麻生)공과대학 미즈다(水田)교수의 논문을 소개하는 것이고, 콘크리트 테크노 2009년 1월에 게재된 문헌을 요약 발췌한 것임을 밝혀둔다.

• Aerospace Industry
• /
• v.26
• /
• pp.16-17
• /
• 1995

• JOURNAL OF ELECTRICAL WORLD
• /
• s.260
• /
• pp.86-92
• /
• 1998