• Title/Summary/Keyword: 시험경로

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A Study on Improved AODV Routing Protocol for Mobility based on ZigBee (ZigBee 기반의 무선 네트워크에서 이동성을 고려한 개선된 AODV 라우팅 프로토콜의 연구)

  • Kim, Yu-Doo;Moon, Il-Young
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.34 no.7B
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    • pp.703-709
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    • 2009
  • Recently, we are using wireless system based on ZigBee technology. It solves a complicated space and frequency movement. Then, we had studied it for improved performance. So, we are must concerned about routing protocol for improvement of a weak point of physical feature. But many researchers are not focusiong on developing Routing Protocol. In this paper, we proposed improved routing protocol using AODV for wireless system based on ZigBee technology. And it is analyzed the simulation result which compare with original and improved AODV protocol based on ZigBee network.

Experimental Study on Consolidation Characteristics of Soft Marine Deposit by Piezocone Dissipation Test (피에조콘 소산시험을 통한 해성연악지반의 압밀특성에 대한 실험적 연구)

  • 박찬국;송정락;김수일
    • Journal of the Korean Geotechnical Society
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    • v.18 no.2
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    • pp.137-146
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    • 2002
  • Field piezocone dissipation tests are performed, and the results are compared to the Rowe cell consolidation tests results to investigate the consolidation characteristics of soft marine deposit at the same location in Korea. From these results, statistical formula fur the relation between the coefficients of horizontal consolidation$(c_r)$ from Rowe cell consolidation tests and $t_{50}$ from pore pressure dissipation tests by Piezocone is suggested through the regression analysis. The results are also compared to the existing theoretical formula. It is also shown that suggested formula is similar to Torstensson's(1977) formula based on cylindrical cavity expansion theory and Houlsby and Teh's(1988) formula based on strain path method.

Review on A.C. power arc tests on insulator sets with a nominal voltage above 1kV (교류 1kV 이상의 애자장치에 대한 파워 아크 시험에 관한 고찰)

  • Rhyou, Hyeong-Kee;Seo, Yoon-Tack;Park, Seung-Jae;Yoon, Hack-Dong;Lee, Yong-Han
    • Proceedings of the KIEE Conference
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    • 2003.07c
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    • pp.1794-1796
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    • 2003
  • 한국전기연구원(전기연)은 애자장치 및 절연물의 파워 아크시험을 수행하고 있으나, 실 사용상태를 모의할 수 있는 시험회로, 애자장치의 설치방법, 아크방전전류의 크기 및 평가방법 등이 미비한 상태에서 절연물의 연면에 적정한 아크에너지를 공급하지 못한 상태로 시험을 수행하고 있다. 국내 외 시험규격에서도 파워아크 발생 경로가 적절치 못하여 절연물과 금구류의 열적 전기적 손상 정도가 실 사용상태에 미치지 못하고 있다. 본 연구에서는 이의 개선을 위하여, 시험법에 대한 (1) 아크방전의 기술적 근거를 마련하고, (2) 성능검증 회로와 애장장치의 아크유기에 대한 기술적 근거, (3) 아크방전전류의 크기 및 평가방법 등을 고찰한다. 본 연구에서 검토한 성능검증방법은 교류 1kV 이상의 세라믹, 자기재 및 복합절연물의 파워 아크시험에 적용 가능하다.

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Dynamic Protocol Conformance Test (동적 프로토콜 적합성 시험)

  • Park, Jin-Hee;Kim, Myung-Chul;Choe, Ji-Young;Yoo, Sang-Jo
    • Journal of KIISE:Information Networking
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    • v.28 no.3
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    • pp.355-368
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    • 2001
  • Protocol conformance test is used to promote interoperability of protocol implementatons developed by venders. Non-interopcrability between protocol implementations may be caused by ambiguity and/or misintellJretation of the protocol specifications by vendors. Conventional method on protocol conformance test has been standardized by IS0;IEC JTCI with the purpose of whether a protocol implementation conforms to its specification. However, sometimes the conventional method gives wrong test results because the test is based on static test sequences. This problem is caused by the fact as some failed transitions of a protocol FSM included in test sequences have an effect on the test result of transitions to be tested. In this paper, a new approach called Dynamic Conformance Test Method (DCTM) is proposed to solve this problem. DCTM dynamically selects test sequence durng testing depending on an information showing an alternative path without failed tranistions. As a result, the fault coverage of the DCTM is better than that of the conventional test method. In order to demonstrate the fault coverage of DCTM compared to that of the conventional method. a testing tool is implemented and appied to the TCP protocol.

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Fracture Behavior of Rail Steel under Mixed Mode Loading (혼합모드하에서의 레일강의 파괴거동)

  • Chang, Dong Il;Kim, Sung Hoon
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.14 no.4
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    • pp.761-769
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    • 1994
  • Actual load acting on rail surface in the track is the combined mode loading due to the contact rolling load of the wheels. To investigate the fracture behavior on rail steel under combined modes I and II, fracture tests were performed by using the test jigs and fracture specimen which were designed by Richard. The analysis results of experimental fracture data were compared with various fracture criteria that have been introduced for determination of the crack propagation direction and the critical stress of fracture of a crack submitted to a mixed mode loading. From the results, it was shown that the actual crack propagation direction of rail steel agree with the crack propagation directions predicted by maximum tangential stress criterion and strain energy density criterion, and that fracture criterion follows principal strain criterion.

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Test for Resource Service by the User Web Portal and the NSI based Network Resource Service Agent (사용자 웹 포털과 NSI 기반의 네트워크 자원 서비스 에이전트에 의한 자원서비스 시험)

  • Lim, Huhnkuk
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.37B no.9
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    • pp.822-830
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    • 2012
  • The most representative research network in Korea, KREONET has developed the NSI based NSA (Network Service Agent) technology. The developed NSA supports web service and provides services for reservation, provision, release and termination of network resource, whenever users want to utilize them. In this paper, the system blocks of the developed NSA and flows of NSI interface massage are presented firstly, Also, service test results for NSI connection reservation is given through internet communication of the web portal system to operate as the RA NSA and the NSA, Finally, it is confirmed that reservation, provision, release and termination of network resource can be established through NSI messages based on reservation information from user, between the web portal and the NSA.

Implementation of School Finding Application in the Smart Phone (스마트 폰을 이용한 학교 찾기 어플리케이션 구현)

  • JANG, Seung-Ju
    • Journal of the Korean Association of Geographic Information Studies
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    • v.18 no.3
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    • pp.102-112
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    • 2015
  • In this paper we propose an application that can help you to find a school near you easily using smart phone GPS capabilities and Google map mounted on Android system. We use a shortest path algorithm to search near destinations. You can take advantage of the developed application when finding public places or destinations. Schools have usually been used as places for disaster evacuation, entrance examination, and qualifying examination. Even though you are not the young who use the smart phone easily, anyone can find a destination school easily with the proposed application of this paper.

Walking path design considering with Slope for Mountain Terrain Open space

  • Seul-ki Kang;Ju-won Lee
    • Journal of the Korea Society of Computer and Information
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    • v.28 no.10
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    • pp.103-111
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    • 2023
  • Mountains area, especially walking in open space is important for special active field which is based on mountain terrain. Recent research on pedestrian-path includes elements about pedestrian and various environment by analyzing network, but it is mainly focusing on limited space except for data-poor terrain like a mountain terrain. This paper proposes an architecture to generate walking path considering the slope for mountain terrain open space through virtual network made of mesh. This architecture shows that it reflects real terrain more effective when measuring distance using slope and is possible to generate mountain walking path using open space unlike other existing services, and is verified through the test. The proposed architecture is expected to utilize for pedestrian-path generation way considering mountain terrain open space in case of distress, mountain rescue and tactical training and so on.

Prediction of Three -Dimensional Behavior of Sand by Isotropic Single Hardening Constitutive Model (등방단일경화구성모델에 의한 모래의 3차원거동 예측)

  • 홍원표;남정만
    • Geotechnical Engineering
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    • v.10 no.1
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    • pp.103-118
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    • 1994
  • A series of drained triaxial testis was performed on a Band by use of cubical triaxial apparatus, in which three principal stresses could be applied independently. The stress -strain behavior on the same stress path with cubical triaxial test was analyzed with application of the isotropic single hardening constitutive model presented by Lade. The behavior predicted by the constitutive model presented good coincidence with experimental results during poi mary loading. However, the predicted Mo윤ding and reloading behavior wan much different from results of cubical triaxial testy. That is, the softening part of the prediction might result in a rough approximation, since the plastic work parameters of single hardening model were based on the hardening portion of the data.

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Comparison of ILS and GBAS Through Flight Test in Taean Aerodrome and Kimpo Airport (태안 비행장과 김포공항 비행시험을 통한 ILS와 GBAS 비교)

  • Koo, Bon-Soo;Kim, Woo-Ri-Ul;Ju, Yo-Han;Hong, Gyo-Young
    • Journal of Advanced Navigation Technology
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    • v.19 no.3
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    • pp.192-198
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    • 2015
  • Since instrument landing system currently operating in most airports is operating in single-pass, it is not possible to accommodate a large number of aircraft. A satellite navigation system GBAS using a GNSS has been developed to solve these limitation when air traffic increases. GBAS is better than the ILS in position accuracy and capable of landing through multiple paths rather than a single path, the aircraft can perform varied landing procedures. In this paper, after we established a virtual ILS procedures at Taean Airfield in which ILS installation is impossible due to environmental requirements and airspace restrictions, flight test was performed by Cessna Skyhawk 172 to compare the virtual ILS procedures and curved approach procedure and the advantage of curved approach was confirmed.