• Title/Summary/Keyword: Point-to-Point

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Effect of Noise Reduction by Installation of a Point to Point Speed Camera (실측자료를 통한 구간단속카메라의 소음저감효과 분석)

  • Son, Jin Hee;Chun, Hyung-Joon;Choung, Tae Ryaug;Park, Young Min;Kim, Deuk Sung
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.27 no.1
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    • pp.57-64
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    • 2017
  • This study was reviewed the noise reduction effects with installation of 'point to point speed camera' for controlling the speed of the car. The multiple regression analysis was performed to know how the relationship between the noise level and these parameters, such as measured traffic volume and rate of heavy vehicle and weighted average speed was changed with and without the 'point to point speed camera'. In the analysis results shows that the less traffic volume, the more noise reduction effect has been increased and the more traffic volume, the more noise reduction effect has been reduced. And noise reduction effects by the 'point to point speed camera' was different from each measured point. The cause of the difference was determined that inadequate 'point to point speed camera' position to see the effect of noise reduction. It is determined to require a more study to improve the noise reduction effects of the 'point to point speed camera' such as the camera position adjustment.

Sweet Spot Search of Antenna Beam using The Two ADALINE (두개의 ADALINE을 이용한 안테나 빔의 스위트 스폿 탐색)

  • Lee, Chang-Young;Choi, Kyu-Min;Kang, Seong-Ho;Chung, Sung-Boo;Eom, Ki-Hwan
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • v.9 no.1
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    • pp.705-708
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    • 2005
  • In this paper, we propose a method that search the sweet spot of antenna beam, and keep it for fast speed transmission in millimeter wave on point-to-point link We use TDD(Time Division Duplex) as transfer method, and it transfers the control data of antenna. The proposed method is composed of two ADALINE which used the parallel. The efficiency of the proposed method is verified by means of simulations with white Gaussian noise and not on point-to-point link.

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Security Architecture for T4 Class Common Data Link

  • Lee, Sang-Gon;Lee, Hoon-Jae;Kim, Hyeong-Rag;Ryu, Young-Jae
    • Journal of the Korea Society of Computer and Information
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    • v.22 no.8
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    • pp.63-72
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    • 2017
  • In this paper, we propose a security architecture for HDLC-based T4 class common data link. The common data links are composed of point-to-point, multi-to-point, and point-to-multi mode. For multi-to-point mode, one node has a bundle of point-to-point links with different end-point on the other side of the links. Thus multi-to-point mode can be considered as a bundle of point-to-point mode. Point-to-multi mode is broadcasting link. For point-to-point mode we adopted robust security network scheme to establish a secure data link, and for multi-to-point mode we use broadcast encryption scheme based on ID-based cryptography to distribute encryption key for broadcasting message encryption. We also included MACsec technology for point-to-point data link security. Computational and communicational complexity analysis on the broadcast encryption have been done.

Real-Time System Design and Point-to-Point Path Tracking for Real-Time Mobile Robot

  • Wang, F.H.
    • 제어로봇시스템학회:학술대회논문집
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    • pp.162-167
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    • 2003
  • In this paper, a novel feasible real-time system was researched for a differential driven wheeled autonomous mobile robot so that the mobile robot can move in a smooth, safe and elegant way. Least Square Minimum Path Planning was well used for the system to generate a smooth executable path for the mobile robot, and the point-to-point tracking algorithm was presented as well as its application in arbitrary path tracking. In order to make sure the robot can run elegantly and safely, trapezoidal speed was integrated into the point-to-point path tracking algorithm. The application to guest following for the autonomous mobile robot shows its wide application of the algorithm. The novel design was successfully proved to be feasible by our experiments on our mobile robot Interactive Robot Usher (IRU) in National University of Singapore.

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An efficient signaling protocol for point-to-point multi-connection call in B-ISDN (B-ISDN에서 점 대 점 다중연결 호를 위한 효율적인 신호프로토콜)

  • 배상재;조현철;주언경
    • Journal of the Korean Institute of Telematics and Electronics S
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    • v.34S no.12
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    • pp.1-9
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    • 1997
  • The signaling protocol for B-ISDN should support variety of services including point-to-pont single-connection call, point-to-point multi-connection call and point-to-multipoint connection call. an efficient signaling protocol for point-to-point multi-connection call based on ITU-T Recommendation Q.298X is presented in this paper. Sequential establishment of madatory and optional connections and common routing scheme for synchronization, along with separation of information elements for establishement of multi-connection call are included in the proposed signaling protocol. Limited network resources can be used more efficiently by proposed sequential establishement of mandartory and optional connection for point-to-point multi-connection call which can provide multimedia services. And common routing can be provided effectively by proposed common routing scheme for connectios requiring synchronization like as video-phone and video-conference.

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A Study on the Introduction of Speed Enforcement System Using Point-to-point Speed Measurement (구간방식 과속단속장치 도입방안에 관한 연구)

  • Lee, Sang-Soo
    • Journal of the Korean Society of Safety
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    • v.22 no.3
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    • pp.88-97
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    • 2007
  • A point based speed enforcement system(SES) has been widely used in roadways to reduce the operating speeds and potential traffic accidents. Recently, the needs for introudcing new SES using point-to-point speed measurement was presented, however, no practical guidelines or justification of the system was available. This study investigated the effectiveness of the current SES and introduction of the new SES through user interview survey method. Survey results showed that 33% of respondents were unsatisfactory to the current way of SES operation, which was 11% higher than satisfactory respondents, and about 70% of the respondents supported the introduction of point-to-point based SES operation. A majority of respondents preferred the straight roadway segment, bridge and tunnel, and curved roadway segment for a start application site with the segment length of 1-5 km long. Using these survey results, an introduction scheme was discussed in terms of legal bases, installation criteria, and operational guidelines.

An Open-Loop Method for Point-to-Point Positioning of a Piezoelectric Actuator

  • Henmi, Nobuhiko;Tanaka, Michihiko
    • International Journal of Precision Engineering and Manufacturing
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    • v.8 no.2
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    • pp.9-13
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    • 2007
  • We describe how to control a piezoelectric actuator using the open-loop method for point-to-point positioning. Since piezoelectric actuators have nonlinear characteristics due to hysteresis and creep between the input voltage and the resulting displacement, a special method is required to eliminate this nonlinearity for an open-loop drive. We have introduced open-loop driving methods for piezoelectric actuators in the past, which required a large input voltage and an initializing motion sequence to reset the state of the actuator before each movement. In this paper, we propose a new driving method that uses the initializing state. This method also utilizes the overshoot from both the upward and downward stepwise drives. Applying this method., we obtained precise point-to-point positioning without the influence of hysteresis and creep.

A Study on Effectiveness Analysis and Development of an Accident Prediction Model of Point-to-Point Speed Enforcement System (구간단속장비 설치 효과 분석 및 사고예측모형 개발)

  • Kim, Da Ye;Lee, Ho Won;Hong, Kyung Sik
    • Journal of the Korean Society of Safety
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    • v.34 no.5
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    • pp.144-152
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    • 2019
  • According to the National Police Agency, point-to-point speed enforcement system is being installed and operated in 97 sections across the country. It is more effective than other enforcement systems in terms of stabilizing the traffic flow and inhibiting the kangaroo effect. But it is only 5.1% of the total enforcement systems. The National Police Agency is also aware that its operation ratio is very low and it is necessary to expand point-to-point speed enforcement system. Hence, this study aims to provide the expansion basis of the point-to-point speed enforcement operation through analysis of the quantitative effects and development the accident prediction model. Firstly, this study analyzed the effectiveness of point-to-point speed enforcement system. Naive before-after study and comparison group method(C-G Method) were used as methodologies of analyzing the effectiveness. The result of using the naive before-after study was significant. Total accidents, EPDOs and casualty crashes decreased by 42.15%, 70.64% and 45.30% respectively. And average speed and the ratio of exceeding speed limit decreased by 6.92% and 20.50%p respectively. Moreover, using the C-G method total accidents, EPDOs and casualty crashes decreased by 31.35%, 66.62% and 10.04% respectively. And average speed and the ratio of exceeding speed limit decreased by 3.49% and 56.65%p respectively. Secondly, this study developed a prediction model for the probability of casualty crash. It was dependant on factors of traffic volume, ratio of exceeding speed limit, ratio of heavy vehicle, ratio of curve section, and presence of point-to-point speed enforcement. Finally, this study selected the most danger sections to the major highway and evaluated proper installation sections to the recent installation section by applying the accident prediction model. The results of this study are expected to be useful in establishing the installation standards for the point-to-point speed enforcement system.

Sweet Spot Search of Antenna Beam using the Modified Genetic Algorithm (변형된 유전자 알고리즘을 이용한 안테나 빔의 스위트 스폿 탐색)

  • Eom, Ki-Hwan;Jung, Kyung-Kwon
    • Journal of the Institute of Electronics Engineers of Korea CI
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    • v.42 no.6
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    • pp.47-54
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    • 2005
  • In this paper, we propose a method that search the sweet spot of antenna beam, and keep it for fast speed transmission in millimeter wave on point-to-point link. We use TDD(Time Division Duplex) as transfer method, and it transfers the control data of antenna. The proposed method is the modified genetic algorithm which selects a superior initial group through slave-processing in order to resolve the local solution of genetic algorithm. The efficiency of the proposed method is verified by means of simulations with white Gaussian noise and not on point-to-point link.

Analysis the Energy Consumption of a Wireless Network Interface in broadcast and point-to-point Environment (브로드캐스트와 Point-to-Point환경에서 무선 네트워크 인터페이스의 에너지 소비 측정 분석)

  • Choi Ji-Hoon;Kim Kwang-Deok;Kim Dong-Il
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.111-114
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    • 2006
  • This paper describes measurement of energy consumption when various size of data packets, on the both broadcast and point-to-point of Wireless network interface, are transmitted, received and discarded in the environment of Ad-hoc network. This experiment measures energy consumption using IEEE 802.11 wireless network interface with each condition. Since the measurements induces linear equation, it can provide useful information for protocol designer and developer. And this paper analyzes the information of behavior of energy consumption for the energy-aware design and the evaluation of network protocol on the practical wireless environment.

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