• Title/Summary/Keyword: Test Network

Search Result 3,519, Processing Time 0.028 seconds

Network Configuration Design of GNSS Receiving Station for Optimizing Performance of Precise Positioning (정밀 위치결정 성능 최적화를 위한 위성항법 수신국 네트워크 구성)

  • Son, Minhyuk;Kim, Geo-Heon;Lee, Eunsung;Heo, Moon-Beam
    • Journal of the Korean Society for Aviation and Aeronautics
    • /
    • v.20 no.4
    • /
    • pp.31-38
    • /
    • 2012
  • In this paper, requirements of GNSS receiver station installation are derived for optimizing the performance of network based GNSS precise positioning by concern of international organization(IGS, NGS) recommendation. Also a analysis method of network based GNSS precise positioning is suggested in order to evaluate the availability depending on various network configurations. To evaluate network candidates, a performance evaluation method is proposed for positioning of users according to a geometric configuration and the baseline distance. After the proposed method is used to Ochang region that is a the test area 6 network candidates are derived and the performance of positioning was analyzed. Finally, Ansung, Gongju, Eumsung, Boeun network configuration was selected as the best positioning performance. An optimal Receiving station network was selected using the proposed method.

Design and Implementation of Interworking Architecture between 3G Cellular Network and Wireless Broadband Network (이동통신망과 WiBro망과의 연동을 위한 네트워크 아키텍처와 구현방안)

  • Woo Dae-Sic;Park Seong-Soo;Lee Dong-Hahk;Yu Jae-Hwang;Ihm Jong-Tae
    • 한국정보통신설비학회:학술대회논문집
    • /
    • 2006.08a
    • /
    • pp.47-52
    • /
    • 2006
  • In this paper, we suggested new network architecture to provide seamless service between the cellular system and new wireless broadband network such as IEEE 802.16e, called WiBro. The interworking technologies are very important issue because mobile operator should provide service connectivity between various wireless networks based on different access technologies. Moreover a change and modification on legacy network should be minimized for providing interworking with new wireless broad-band network. We implemented proposed interworking architecture between 3G cellular network and 802.16e network to provide seamless service including interworking unit in real test environment. Also, we performed performance evaluation in hybrid network environments.

  • PDF

A Study on Network Load Management in MANET (MANET 환경에서의 네트워크 부하관리에 관한 연구)

  • Kang, Kyeong-In;Bae, Park-Kyong;Jung, Chan-Hyeok
    • Journal of IKEEE
    • /
    • v.7 no.2 s.13
    • /
    • pp.127-134
    • /
    • 2003
  • Ad Hoc Networks, autonomous distributed network using routing scheme, does not operate properly owing to multi flow service when network load increases at specific network node. In this paper, we suggest traffic management routing protocol in Ad Hoc Network to reduce network traffic congestion and distribute network load in data transmission. Through test results of proposed algorithm under NS(Network Simulator)simulator environments . we acquired reduced network load and increased data transmission rate.

  • PDF

Generalization of Road Network using Logistic Regression

  • Park, Woojin;Huh, Yong
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
    • /
    • v.37 no.2
    • /
    • pp.91-97
    • /
    • 2019
  • In automatic map generalization, the formalization of cartographic principles is important. This study proposes and evaluates the selection method for road network generalization that analyzes existing maps using reverse engineering and formalizes the selection rules for the road network. Existing maps with a 1:5,000 scale and a 1:25,000 scale are compared, and the criteria for selection of the road network data and the relative importance of each network object are determined and analyzed using $T{\ddot{o}}pfer^{\prime}s$ Radical Law as well as the logistic regression model. The selection model derived from the analysis result is applied to the test data, and road network data for the 1:25,000 scale map are generated from the digital topographic map on a 1:5,000 scale. The selected road network is compared with the existing road network data on the 1:25,000 scale for a qualitative and quantitative evaluation. The result indicates that more than 80% of road objects are matched to existing data.

Network traffic prediction model based on linear and nonlinear model combination

  • Lian Lian
    • ETRI Journal
    • /
    • v.46 no.3
    • /
    • pp.461-472
    • /
    • 2024
  • We propose a network traffic prediction model based on linear and nonlinear model combination. Network traffic is modeled by an autoregressive moving average model, and the error between the measured and predicted network traffic values is obtained. Then, an echo state network is used to fit the prediction error with nonlinear components. In addition, an improved slime mold algorithm is proposed for reservoir parameter optimization of the echo state network, further improving the regression performance. The predictions of the linear (autoregressive moving average) and nonlinear (echo state network) models are added to obtain the final prediction. Compared with other prediction models, test results on two network traffic datasets from mobile and fixed networks show that the proposed prediction model has a smaller error and difference measures. In addition, the coefficient of determination and index of agreement is close to 1, indicating a better data fitting performance. Although the proposed prediction model has a slight increase in time complexity for training and prediction compared with some models, it shows practical applicability.

SMC: An Seed Merging Compression for Test Data (시드 병합을 통한 테스트 데이터의 압축방법)

  • Lee Min-joo;Jun Sung-hun;Kim Yong-joon;Kang Sumg-ho
    • Journal of the Institute of Electronics Engineers of Korea SD
    • /
    • v.42 no.9 s.339
    • /
    • pp.41-50
    • /
    • 2005
  • As the size of circuits becomes larger, the test method needs more test data volume and larger test application time. In order to reduce test data volume and test application time, a new test data compression/decompression method is proposed. The proposed method is based on an XOR network uses don't-care-bits to improve compression ratio during seed vectors generation. After seed vectors are produced seed vectors can be merged using two prefix codes. It only requires 1 clock time for reusing merged seed vectors, so test application time can be reduced tremendously. Experimental results on large ISCAS '89 benchmark circuits prove the efficiency of the proposed method.

Multiple Fault Detection in Combinational Logic Networks (조합논리회로의 다중결함검출)

  • 고경식;김흥수
    • Journal of the Korean Institute of Telematics and Electronics
    • /
    • v.12 no.4
    • /
    • pp.21-27
    • /
    • 1975
  • In this paper, a procedure for deriving of multiple fault detection test sets is presented for fan-out reconvergent combinational logic networks. A fan-out network is decomposed into a set of fan-out free subnetworks by breaking the internal fan-out points, and the minimal detecting test sets for each subnetwork are found separately. And then, the compatible tests amonng each test set are combined maximally into composite tests to generate primary input binary vectors. The technique for generating minimal test experiments which cover all the possible faults is illustrated in detail by examples.

  • PDF

Precise position control of hydraulic driven stenciling robot using neural network (신경회로망을 이용한 유압 스텐슬링 로봇의 정확한 위치 제어)

  • Jung, Seul
    • 제어로봇시스템학회:학술대회논문집
    • /
    • 1997.10a
    • /
    • pp.779-782
    • /
    • 1997
  • In this paper, accurate position control of a stenciling robot manipulator is designed. The stenciling robot is requried to draw lines and characters on the pavement. Since the robot is huge and heavy, the inertia is expected to play a major role in the tracking performance as desired. Here we are proposing neural network control scheme for a computed-torque like controller for the stenciling robot. On-line compensation is achieved by neural network. Simulation studies with stenciling robot are carried out to test the performance of the proposed control scheme.

  • PDF

Improvment of Branch and Bound Algorithm for the Integer Generalized Nntwork Problem (정수 일반네트워크문제를 위한 분지한계법의 개선)

  • 김기석;김기석
    • Journal of the Korean Operations Research and Management Science Society
    • /
    • v.19 no.2
    • /
    • pp.1-19
    • /
    • 1994
  • A generalized network problem is a special class of linear programming problem whose coefficient matrix contains at most two nonzero elements per column. A generalized network problem with 0-1 flow restrictions is called an integer generalized network(IGN) problem. In this paper, we presented a branch and bound algorithm for the IGN that uses network relaxation. To improve the procedure, we develop various strategies, each of which employs different node selection criterion and/or branching variable selection criterion. We test these solution strategies and compare their efficiencies with LINDO on 70 randomly generated problems.

  • PDF

A Study on WiBro Application to Telematics Wireless Communications Network (휴대인터넷의 텔레매틱스 무선통신 방식으로의 활용 방안)

  • Oh, Kil-Nam;Kim, Bong-Soo;Choi, Wan-Sik
    • Proceedings of the KIEE Conference
    • /
    • 2005.10b
    • /
    • pp.276-278
    • /
    • 2005
  • This paper introduces the testbed configuration for telematics wireless communications using WiBro network, one of the next generation wireless communication networks. We review the architecture and core technology of WiBro network, and investigate WiBro based telematics services, WiBro testbed configuration, and function verification and test method for WiBro wireless communication access module.

  • PDF