• Title/Summary/Keyword: Type Certification(TC)

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A Study on the Icing Certification of Rotorcraft (회전익 항공기의 결빙 인증에 대한 연구)

  • Lee, Hae-Sun;Park, Jong-Hyuk
    • Aerospace Engineering and Technology
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    • v.7 no.2
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    • pp.196-204
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    • 2008
  • Modem rotorcraft is required to have the capability to operate in all-weather conditions. Also icing condition is important issue to aircraft safety and certification. And rotorcraft icing research has come a long way during the past few decades. The aircraft icing is the most difficult to handle. So, icing-related accidents, incidents and operating problems still occur regularly in service, despite improvements in design and test techniques. By reviewing icing certification requirement of FAR(Federal Aviation Regulations) and KAS(Korean Airworthiness Standard), this paper describes methods how to demonstrate safety in the flight and consideration of icing when rotorcraft is required TC(Type Certification).

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International Standardization Analysis for Environmental Management and Labelling (국제환경경영 표준화와 환경라벨링의 동향)

  • Cho, Jai-Rip
    • Journal of Korean Society for Quality Management
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    • v.23 no.4
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    • pp.180-189
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    • 1995
  • Today, as globalization continues and international trading blocks are formed, world markets are intensely competitive and abound in product variety, volume, complexity and environmental management. Specifically, green consumer's needs and expectations are changing and diversifying, resulting in a changed global environment for industry. Due to these changes, domestic companies are striving to achieve the Environmental Management System (ISO 14000) certification. This is considered a basis step in meeting the guiding principle and practice of ISO/TC 207/SC 3 resolution. In this paper, we will present three type(I, II, III) of Environmental Labelling programs to build a model for environmental management system by analysing practitioner and stakeholder. After companies establish an ISO 9000 quality system these companies should focus on improve toward their own Environmental Labelling program and continue to build ISO 14000.

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Study on Flight Test Practice of the Small Civil Airplane Development for Pitot-Static System's Error Identification (소형 항공기 개발 동정압계통 오차 확인 비행시험 사례)

  • Kim, Chanjo;Seo, Jihan;Lee, Wonjoong
    • Journal of Aerospace System Engineering
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    • v.7 no.3
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    • pp.33-38
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    • 2013
  • The air data measured from the static pressure, the dynamic pressure and etc. of an airplane is used for calculation of many flight parameters(altitude and airspeed and so on) and these values applied to flight safety and navigation flight. The pitot-static system of the development airplane is calibrated by finding of pitot-static system's error using tower fly-by, trailing cone method and etc. This paper is describing for the introduction of the trailing cone method and major items for test planning, preparation, operation and results for air data calibration flight test performed, considering efficiency and safety during KC-100 development project.

Efficient Authentication for Mobile Nodes in Mobile Ad Hoc Network (Mobile Ad Hoc Network에서 이동 노드에 대한 효율적인 인증 메커니즘)

  • Lee Yong
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.42 no.11
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    • pp.27-34
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    • 2005
  • Mobile Ad Hoc Networks (MANETs) are self-organized networks that do not rely in their operation on wired infrastructure. As in any networking technology, security is an essential element in MANET as well, for proliferation of this type of networks. But supporting secure communication in MANETs proved to be a significant challenge, mainly due to the fact that the set of nodes in the network can change frequently and rapidly and due to the lack of access to the wired infrastructure. In particular, the trust model and the authentication protocols, which were developed for wired and infrastructure-based networks, cannot be used in MANETs. In this paper, we address the problem of efficient authentication of distributed mobile users in geographically large networks. In particular, we propose a new authentication scheme for this case of MANETs. The proposed scheme exploits Randomized Groups to efficiently share authentication information among nodes that together implement the function of a distributive Certification Authority (CA). We then evaluate the performance of authentication using Randomized Groups.

Numerical Analysis of Authentication Algorithm using Randomized CA Groups in Mobile Ad Hoc Networks (모바일 애드혹 네트워크에서 랜덤 CA 그룹을 이용한 인증 알고리즘에 대한 성능 분석)

  • Lee, Yong;Lee, Goo-Yeon
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.46 no.8
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    • pp.22-33
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    • 2009
  • Mobile Ad Hoc Networks (MANETs) are self-organized networks that do not rely in their operation on wired infrastructure. As in any networking technology, security is an essential element in MANET as well, for proliferation of this type of networks. But supporting secure communication in MANETs proved to be a significant challenge, mainly due to the fact that the set of nodes in the network can change frequently and rapidly and due to the lack of access to the wired infrastructure. In particular, the trust model and the authentication protocols, which were developed for wired and infrastructure-based networks, cannot be used in MANETs. In [1], we addressed the problem of efficient authentication of distributed mobile users in geographically large networks and proposed a new authentication scheme for this case of MANETs. The proposed scheme exploits randomized groups to efficiently share authentication information among nodes that together implement the function of a distributive Certification Authority(CA). In this paper, we analyze numerically the performance of authentication method using randomized groups and compare with the simulation result.