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

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Space Diversity Combining Scheme Using Phase Difference between Main and Diversity Signals (메인과 다이버시티 신호사이 위상차를 이용한 공간 다이버시티 결합방법)

  • Jung, Gillyoung
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.14 no.5
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    • pp.44-51
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    • 2015
  • The deployment of high capacity backhaul is required due to explosive growth in mobile data services. For rapid backhaul deployment, point to point microwave is a much easier and cheaper technology. The space diversity scheme is used in point to point microwave links. The purpose of space diversity is to overcome fading by combining signals from two separate receiver antennas. For signal combining algorithm, maximum power and minimum distortion methods were used and these algorithms were reported not to be good enough for robustness in selective fading. In this paper, a more practically efficient signal combining scheme from the main and diversity branch is proposed and evaluated in selective fading channel. The proposed algorithm has shown significant performance improvement in terms of signal spectrum.

Minimum time path planning of robotic manipulator in drilling/spot welding tasks

  • Zhang, Qiang;Zhao, Ming-Yong
    • Journal of Computational Design and Engineering
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    • v.3 no.2
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    • pp.132-139
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    • 2016
  • In this paper, a minimum time path planning strategy is proposed for multi points manufacturing problems in drilling/spot welding tasks. By optimizing the travelling schedule of the set points and the detailed transfer path between points, the minimum time manufacturing task is realized under fully utilizing the dynamic performance of robotic manipulator. According to the start-stop movement in drilling/spot welding task, the path planning problem can be converted into a traveling salesman problem (TSP) and a series of point to point minimum time transfer path planning problems. Cubic Hermite interpolation polynomial is used to parameterize the transfer path and then the path parameters are optimized to obtain minimum point to point transfer time. A new TSP with minimum time index is constructed by using point-point transfer time as the TSP parameter. The classical genetic algorithm (GA) is applied to obtain the optimal travelling schedule. Several minimum time drilling tasks of a 3-DOF robotic manipulator are used as examples to demonstrate the effectiveness of the proposed approach.

Efficient Schemes for Scaling Ring Bandwidth in Ring-based Multiprocessor System (링 구조 다중프로세서 시스템에서 링 대역폭 확장을 위한 효율적인 방안)

  • Jang, Byoung-Soon;Chung, Sung-Woo;Jhang, Seong-Tae;Jhon, Chu-Shik
    • Journal of KIISE:Computer Systems and Theory
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    • v.27 no.2
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    • pp.177-187
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    • 2000
  • In the past several years, many systems which adopted ring topology with high-speed unidirectional point-to-point links have emerged to overcome the limit of bus for interconnection network of clustered multiprocessor system. However, rapid increase of processor speed and performance improvement of local bus and memory system limit scalability of system with point-to-point link of standard bandwidth. Therefore, necessity to extend bandwidth is emphasized. In this paper, we adopt PANDA system as base model, which is clustering-based multiprocessor system. By simulating a model adopting commercial processor and local bus specification, we show that point-to-point link is bottleneck of system performance, and bandwidth expansion by more than 200% is needed. To expand bandwidth of interconnection network, it needs excessive design cost and time to develop new point-to-point link with doubled bandwidth. As an alternative to double bandwidth, we propose several ways to implement dual ring -simple dual ring, transaction-separated dual ring, direction-separated dual ring- by using off-the-shelf point-to-point links with IEEE standard bandwidth. We analyze pros. and cons. of each model compared with doubled-bandwidth single ring by simulation.

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Study of the Effect of the Point-to-Point Speed Enforcement System Using a Comparison-Group Method (비교그룹방법을 이용한 무인구간속도위반단속시스템 설치 효과 분석)

  • Yun, Il-Soo;Park, Sung-Ho;Oh, Bong-Sik;Oh, Young-Tae
    • International Journal of Highway Engineering
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    • v.13 no.4
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    • pp.177-185
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    • 2011
  • In order to reduce traffic accidents at long road sections involving high risks of traffic accidents, including tunnels, bridges or curves, the National Police Agency have decided a tentative installation and operation of an automated point-to-point speed enforcement system based on cameras at January, 2007. The first system was established at the direction to Kangreung of Dunnae Tunnel at December, 2007. Currently, the automated point-to-point speed enforcement system operates at 11 sections including eight sections on expressways and three sections on national highways. However, there have been few researches on the effects of the system upon the reduction of traffic accidents in a scientific way. To this end, this research effort was initiated to evaluate the effect of the automated point-to-point speed enforcement system on traffic safety by comparing the number of traffic accidents before and after the installation of the system using a comparison-group(C-G) method. Three-year-long traffic accident data for the expressways were collected in order to evaluate the system. As a result, the installation of the system was found to reduce traffic accidents by 49.97% in average.

Set-Point Control of Elastic Joint Robots Using only Position Measurements

  • Son, Young-Ik;Hyungbo Shim;Seo, Jin-Heon
    • Journal of Mechanical Science and Technology
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    • v.16 no.8
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    • pp.1079-1088
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    • 2002
  • Motivated by the dynamic output feedback passification results, point-to-point control laws for an elastic joint robot are presented when only the position measurements are available. The proposed method makes a parallel connection of the robot system and an input-dimensional linear system which obtains the effect of the desired differentiators. It is shown that the closed-loop nonlinear robot system can be rendered output strictly passive and the regulation of the system is achieved in the end. Robustness analysis is also given with regard to uncertainties on the robot parameters. Performance of the proposed control law is illustrated in the simulation studies of a manipulator with three revolute elastic joints.

Voltage-Mode 1.5 Gbps Interface Circuits for Chip-to-Chip Communication

  • Lee, Kwang-Jin;Kim, Tae-Hyoung;Cho, Uk-Rae;Byun, Hyun-Geun;Kim, Su-Ki
    • ETRI Journal
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    • v.27 no.1
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    • pp.81-88
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    • 2005
  • In this paper, interface circuits that are suitable for point-to-point interconnection with an over 1 Gbps data rate per pin are proposed. To achieve a successful data transfer rate of multi-gigabits per-second between two chips with a point-to-point interconnection, the input receiver uses an on-chip parallel terminator of the pass gate style, while the output driver uses the pullup and pulldown transistors of the diode-connected style. In addition, the novel dynamic voltage level converter (DVLC) has solved such problems as the access time increase and valid data window reduction. These schemes were adopted on a 64 Mb DDR SRAM with a 1.5 Gbps data rate per pin and fabricated using a 0.10 ${\mu}m$ dual gate oxide CMOS technology.

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The Intelligent Algorithm for sweet spot (ICCAS 2003)

  • Lim, Sung-Jin;Jung, Kyung-Kwon;Eom, Ki-Hwan;Onodera, Sosuke;Sato, Yoichi
    • 제어로봇시스템학회:학술대회논문집
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    • pp.1763-1766
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    • 2003
  • Millimeter-wave networking is composed of narrow beam link. it is very substantial that beam connecting point to point is fixed in right direction. It is major requirement in the beam network to keep the beam in best direction. In this paper, We propose the method to find a best suited direction of the antenna's beam using the Genetic Algorithm (GA) in point-to-point link. Proposed method presume that each station knows his direction ${\theta}_1$ , ${\theta}_2$ at every step of GA, then it can be expected that GA is possible to search the ideal solution. Intensity of the received signal is evaluated by the multiplication of lengths to the point which the lobe meets with the horizontal line.

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IPTV Delivery Architecture in 10G EPONs using ONU-Based Multicast Emulation

  • Choi, Su-Il
    • Journal of the Optical Society of Korea
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    • v.12 no.2
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    • pp.69-78
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    • 2008
  • EPONs are a low cost, high speed solution to the bottleneck problem of broadband access networks. To support point-to-point and shared LAN emulation, EPONs use the multi-point control protocol (MPCP), which uses logical link identification (LLID) forframe tagging and filtering between the OLT and ONUs. In this paper, ONU-based multicast or multiple shared LAN emulation for IPTV services is proposed using logical group identification (LGID). Using ONUbased VLAN services, EPONs can support separate and secure connections between providers and subscribers in a simple manner. Also, differentiated IPTV channel packages can be delivered through EPONs by implementing ONU-based VLAN and IGMP snooping mechanisms.

Marine Self-organizing VHF Data Link: Operational Principle

  • Sun, Wen-Li;Pang, Fu-Wen;Hong, Tchang-Hee
    • Journal of the Korean Institute of Navigation
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    • v.22 no.4
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    • pp.21-29
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    • 1998
  • The marine self-organizing VHF data link is a digital radio link with self-organizing ability, which exploits the STDMA algorithm and operates in marine VHF channels. It can support the applications of surveillance, situation awareness and communication. It is the core technology of the Universal AIS which is considered as a future surveillance system at sea by the IMO. In this paper, the operational principle of the marine self-organizing VHF data link is introduced. Simultaneously, a new access protocol is proposed to enhance the marine self-organizing VHF data link so as to support point-to-point communication. The point-to-point communication is one of the most important bases to establish dynamic internetworks among computers on the bridges in the future.

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