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컨티뉴아 국제 인증용 지능형 헬스케어 단말기 인터페이스 설계 및 구현
이정기,김국세,안성수,이호영,이준,Lee, Jeong-Gi,Kim, Kuk-Se,Ahn, Seong-Su,Lee, Ho-Young,Lee, Joon 한국정보통신학회 2012 한국정보통신학회논문지 Vol.16 No.9
With increasing chronic patients due to population aging, many needs for pro-active health and medical treatment services are rising and desire for health care service is also rising due to national standard of living Especially population aging of Korea is faster than America, France and many other advanced nations, and a study states that arrival time of elderly population rates; 14%(aged society) to 20%(transcendental aged society)l only takes 8 years. In these reasons, health care industry for the next engine industry is reinforced. Many health care terminals are coming out and Continua Health Alliance is founded and working steadily based on Philips in 2006. In this paper, we suggest Gateway interface system for Continua accreditation to control vary communication by designing intelligent health care interface suitable for Continua international accreditation because there are many types of terminals and communication protocols.
Peer-to-Peer 환경에서의 정보 공유를 위한 인증 메커니즘 구현
이정기,배일호,이철승,문정환,박찬모,이준,Lee, Jeong-Ki,Bae, Il-Ho,Lee, Cheol-Seung,Moon, Jung-Hwan,Park, Chan-Mo,Lee, Joon 한국정보통신학회 2002 한국정보통신학회논문지 Vol.6 No.7
정보사회로 진행되어 감에 따라 컴퓨터 네트워크 사용 및 규모의 증대는 더욱 가속화되어 가고 있다. 또한 컴퓨터 네트워크를 통해서 교환되는 정보의 양의 증가와 함께 네트워크의 보안성이 새로운 문제점으로 부각되고 있다. P2P는 자유로운 네트웍을 구성할 수 있고, 중앙 서버 기능을 없애거나 약화시켜서 각 User간에 참여판 수 있는 개방 네트워크이기 때문에, 각 User간 인증에 관한 문제가 대두되고있다. 네트웍에 있는 어떤 사용자가 공개된 환경에 있다고 가정하면, 각 User간에 허가받은 사용자에게만 접속을 제한하기 위해서는 서비스에 대한 요구를 인증 해야한다. 본 논문에서는 이를 해결하기 위해 P2P 환경에서 보안을 유지하는 방법을 제안하고, P2P 환경에서 안전하게 정보를 공유할 수 있는 메커니즘으로 Kerberos 인증 메커니즘을 인용하여 인증 메커니즘을 설계하였다. According as progress by information society, computer network use and enlargement of scale are accelerated more. Also, with good physician increase of information that is exchanged through computer network, security of network is embossed to controversial point that is new. Because P2P as that remove or weakens center server function is open network that can participate between each user, problem about authentication between each users is risen. If certain user in network i3 in open environment, this user must authenticate request about service to user who is admitted between each user to limit connection. This treatise proposed method to keep security in P2P environment to solve this and designed certification mechanism that quote Kerberos certification mechanism to mechanism that can share information safety in P2P environment.
이정기,용기중,김자륭,엄성복,Lee, Jung-Ki,Yong, Geejoong,Kim, Cha-Ryung,Eom, Seong-Bok 한국자동차안전학회 2018 자동차안전학회지 Vol.10 No.3
Greenhouse gas is the big issue of the whole world. So foreign countries, EU, USA, Japan, China and Korea made the policy for reducing greenhouse gas. For calculation of reduction, it is necessary to know the quantity of current greenhouse emission per year in Korea. It is not reflected real driving condition for measuring the Fuel economy and greenhouse gas. The subject of this study is to figure out the characteristics which influence on greenhouse gas in real driving condition. And final goal is applying the policy greenhouse emission reduction.
안드로이드 기반 스마트 홈 디바이스의 통신 데이터 보안 및 통합 관리 플랫폼 연구개발
이정기,양철승,김준하,김강진,Lee, Jeong-Gi,Yang, Chul-Seung,Kim, Jun-Ha,Kim, Kang-Jin 한국정보통신학회 2015 한국정보통신학회논문지 Vol.19 No.5
본 연구 논문에서는 건물 설비 관리자의 임무로 부여되어 수동적으로 관리되고 있는 주거환경 및 건물환경 관리 시스템에 대한 감시와 점검, 성능 및 고장 진단, 에너지 사용량 관리 시스템을 안드로이드 기반 통합제어 플랫폼을 통하여 관리함으로서 사용자의 접근이 쉽고 개발성 및 확장성에 대한 편의를 제공하도록 구현한다. 그리고 센서기반 스마트 홈 관련 제품은 데이터 교환 방식이 서로 다르기 때문에 이를 통합 할 수 있는 플랫폼을 개발하여 이기종간 네트워크 제품을 쉽고 연결하고 외부 데이터 전송 시 보안처리된 데이터 통신의 통합 작업이 가능하도록 지원하였다.
유리판과 단일방향 탄소섬유강화 플라스틱판에서 점원에 의해 발생된 과도적 탄성파의 주파수 해석
이정기,김호철,최명선,김영환,Lee, Jeong-Ki,Kim, Ho-Chul,Choi, Myoung-Seon,Kim, Young-Hwan 한국음향학회 1994 韓國音響學會誌 Vol.13 No.6
Spectral analysis of transient elastic waves were carried out in order to identify the propagation modes in glass and unidirectional carbon fibre reinforced plastic (CFRP) plates. Pencil leads were broken on the surface of plates to generate elastic waves, and two broad band transducers of 6.35 mm in diameter and 10 MHz center frequency were placed at the linear location from the source. The frequency spectra of detected signals showed that the wave propagation in the plates obeyed the Lamb wave dispersion relation. The transient signals were the fast propagating modes around maximum group velocity of the lowest and first order symmetric $modes(S_{0} and S_{1}),$ and first order antisymmetric $mode(A_{1})$. The transient signals were not severely distorted due to relatively small dispersion of those modes around the maximum group velocity. The fastest propagating mode in the plates was shown to be $S_{0}$ mode less the than cut-off frequency of $A_{1}$ mode.
유한 물체 거리를 갖는 2 반사경계의 곡률 선형 방정식
이정기,임천석,Lee, Jung-Gee,Rim, Cheon-Seog 한국광학회 2005 한국광학회지 Vol.16 No.5
In this paper, we propose easily tooling method for Seidel third order aberration, which are not well utilized in actual design process due to the complication of mathematical operation and the difficulty of understanding Seidel third order aberration theory, even though most insightful and systematic means in pre-designing for the initial data of optimization. First, using paraxial ray tracing and Seidel third order aberration theory, spherical aberration coefficient is derived for a two-mirror system with a finite object distance. The coefficient, which is expressed as a higher-order nonlinear equation, consists of design parameters(object distance, two curvatures, and inter-mirror distance) and effective focal length(EFL). Then, the expressed analytical equation is solved by using a computer with numerical analysis method. From the obtained numerical solutions satisfying the nearly zero coefficient condition($<10^{-6}$), linear fitting process offers a linear relationship called the curvature linear equation between two mirrors. Consequently, this linear equation has two worthy meanings: the equation gives a possibility to obtain initial design data for optimization easily. And the equation shows linear relationship to a two-mirror system with a finite object distance under the condition of corrected third order spherical aberration.