Two-Dimensional Closest Point-to-Point Solution Based on Region Partition Detection

2019 ◽  
Author(s):  
BANGCHENG ZHAN ◽  
HAOHUA NIU ◽  
XIHAN LIUCHEN
Keyword(s):  
Two Dimensional ◽  
Region Partition ◽  
Point Solution ◽  
Point To Point

scholarly journals Research on Antennas Alignment of Dynamic Point-to-Point Communication

2018 ◽  
Vol 2018 ◽  
pp. 1-5 ◽  
Author(s):  
Qilin Zeng ◽  
Jiaxin Liu ◽  
Weiming Xiong
Keyword(s):  
Elevation Angle ◽  
Least Square Method ◽  
Optimal Level ◽  
Least Square ◽  
Two Dimensional ◽  
Scanning Strategy ◽  
One Dimensional ◽  
Communication Signal ◽  
Signal Value ◽  
Point To Point

In the dynamic point-to-point communication, to track and aim at antenna fast and accurately is the guarantee of high quality communication signal. In order to solve the problem of antenna alignment, we used the least square method (LSM) to fit the optimal level signal value (LSV) point which is based on coordinate coarse tracking alignment and matrix scanning strategy to find the LSV in this paper. Antenna is driven by two-dimensional turntable (azimuth and elevation angle (AE)): the two-dimensional turntable is decomposed into two independent one-dimensional turntables, and the LSV in AE direction are obtained by scanning, respectively. The optimal LSV point of two-dimensional turntable can be find by combing optimal LSV point of two independent one-dimensional turntables. The method has the advantages of high precision and easy implementation and can meet the requirement of fast and accurately alignment in dynamic point-to-point communication antenna engineering.

Antisway Control for a Rotary Crane by Using Evolutionary Computation

2016 ◽  
Vol 28 (5) ◽  
pp. 646-653 ◽  
Author(s):  
Akira Abe ◽  
◽  
Keisuke Okabe ◽  
Keyword(s):  
Evolutionary Computation ◽  
Optimal Trajectory ◽  
Control Method ◽  
Open Loop ◽  
Two Dimensional ◽  
Loop Control ◽  
Dimensional Plane ◽  
Rotary Crane ◽  
Point To Point ◽  
Sway Motion

[abstFig src='/00280005/05.jpg' width='250' text='Photograph of the experimental setup' ] We present a simple antisway control method for a rotary crane, whose load can move in a two-dimensional plane. In particular, we investigate the suppression of residual sway motion of a rotary crane with a boom that performs point-to-point motion. In the proposed method, we attempt to generate the trajectory of the boom using a combination of polynomial and cycloidal functions. The profile of the generated trajectory depends on the coefficients of the polynomial function. Thus, it is necessary to tune the coefficients to minimize the sway motion in the two-dimensional plane as much as possible. We adopt a particle swarm optimization algorithm, an evolutionary computation technique, to tune the coefficients and then obtain the optimal trajectory. By rotating the boom along the optimal trajectory, the two-dimensional residual sway motion is suppressed, i.e., an open-loop control is realized. The effectiveness and feasibility of the proposed control scheme is demonstrated via simulations and experiments.

Theory of two-dimensional focusing of a spherical X-ray wave by Bragg diffraction by two bent crystals

2002 ◽  
Vol 35 (6) ◽  
pp. 713-719
Author(s):  
T. Tchen
Keyword(s):  
Film Thickness ◽  
Spherical Aberration ◽  
Dynamical Theory ◽  
Bragg Diffraction ◽  
Two Dimensional ◽  
Double Crystal ◽  
X Ray ◽  
Point To Point ◽  
Bent Crystals

The dynamical theory of the diffractional Bragg focusing in a system of cylindrically bent crystals is developed. Two-dimensional focusing `point-to-point' is shown to be possible under certain conditions. The influence of geometrical aberrations (astigmatism, spherical aberration) on the focusing is discussed. The influence of X-ray source sizes and temperature on the focusing is treated theoretically. A double-crystal focusing spectrometer is analysed. Focusing of X radiation by crystals with thin epitaxic films is investigated theoretically. Sensitivity of this focusing to the film thickness (∼1 µm) is demonstrated.

A WORMHOLE ROUTER WITH EMBEDDED BROADCASTING VIRTUAL BUS FOR MESH COMPUTERS

2000 ◽  
Vol 10 (01) ◽  
pp. 29-37
Author(s):  
BONG WAN KIM ◽  
JONG HYUK CHOI ◽  
KWANG-IL PARK ◽  
KYU HO PARK
Keyword(s):  
New Method ◽  
Two Dimensional ◽  
Simulation Results ◽  
Set Up ◽  
Point To Point

In this paper, we propose a new method of implementing bus operations on mesh wormhole routers with small additional circuits. The bus, called a virtual bus, is set up dynamically upon a request by bypassing existing datapath in wormhole routers. After bus setup, it acts as a real bus by sharing the point-to-point links of the corresponding row/column of the mesh. Simulation results show that the 2D (two-dimensional) mesh with the virtual bus outperforms the mesh with separate buses.

scholarly journals StartReact increases probability of muscle activity and distance in severe/moderate stroke survivors during two-dimensional reaching task

2019 ◽  
Author(s):  
Marziye Rahimi ◽  
Claire F. Honeycutt
Keyword(s):  
Muscle Activity ◽  
Muscle Activation ◽  
Stroke Survivors ◽  
Two Dimensional ◽  
Future Studies ◽  
Reaching Task ◽  
Movement Distance ◽  
Final Error ◽  
Activity Onset ◽  
Point To Point

AbstractObjectiveStartReact elicits faster, larger, and more appropriate muscle activation in stroke survivors but has been only cursorily studied to date during multi-jointed reaching. Our objective was to evaluate StartReact on unrestricted, two-dimensional point-to-point reaching tasks post-stroke.MethodData from 23 individuals with stroke was collected during point-to-point reaching. Voluntary and StartReact trials were compared between mild, severe/moderate, and the unimpaired arm.ResultsStartReact showed an increase in probability of muscle activity, larger muscle activity amplitude and faster muscle activity onset. Despite changes in muscle activity, metrics of movement (distance, final error, linear deviation) were largely the same between StartReact and Voluntary trials except in severe/moderate stroke who had larger reaching distances during StartReact.ConclusionWhile StartReact impacted many metrics of muscle activity, the most profound effect was on probability of muscle activity increasing 34% compared to Voluntary which allowed severe/moderate subjects to increase reaching distance but did not translate to decrease in final error suggesting that the additional movement was not always directed towards the appropriate target.SignificanceThese results indicate that SR has the capacity to activate paralyzed muscle in severe/moderate patients, but future studies are needed to explore the possible use of SR in the rehabilitation.

Thrust Vector Control by Secondary Gas Injection in Two-Dimensional Nozzles

1968 ◽  
Vol 72 (685) ◽  
pp. 77-81 ◽  
Author(s):  
John H. Neilson ◽  
Alastair Gilchrist ◽  
Chee K. Lee
Keyword(s):  
Static Pressure ◽  
The Body ◽  
Two Dimensional ◽  
Nozzle Wall ◽  
Side Force ◽  
Wall Area ◽  
Conical Shock ◽  
Supersonic Region ◽  
Secondary Port ◽  
Point To Point

When side force is produced by the injection of a secondary gas into the supersonic region of an axi-symmetric nozzle, the body shape of the obstruction caused by the secondary flow induces a cone-shaped separation region upstream of the port. From the apex of the cone a conical shock front is developed. Part of the total side force produced is due to the excess static pressure acting on the nozzle wall in (a) the separated region, and in (b) the wall area lying between the separated region and the trace of the shock on the nozzle wall. In such a field the static pressure is not uniform downstream of the shock but varies from point to point on the nozzle wall areas in question. This aspect of axi-symmetric flow makes attempts to correlate theoretical and experimental work difficult. It was considered that basic information about the important parameters, which influence side force, could best be obtained in experiments with two-dimensional nozzles. Here the circular secondary port is replaced by a rectangular port, the separation zone is wedge-shaped, the shock has a plane front, and in theory, the static pressure is uniform between the port and the point at which the boundary layer separates.

scholarly journals JAMMING TRANSITION OF POINT-TO-POINT TRAFFIC THROUGH CO-OPERATIVE MECHANISMS

2012 ◽  
Vol 23 (11) ◽  
pp. 1250077 ◽  
Author(s):  
JUN FANG ◽  
ZHENG QIN ◽  
XIQUN CHEN ◽  
ZHAOHUI XU
Keyword(s):  
Average Velocity ◽  
Critical Density ◽  
Two Dimensional ◽  
Average Flow ◽  
Traffic Models ◽  
Face To Face ◽  
Jamming Transition ◽  
Ping Pong ◽  
Point To Point ◽  
Alternative Routes

We study the jamming transition of two-dimensional point-to-point traffic through co-operative mechanisms (DCM) using computer simulation. We propose two decentralized co-operative mechanisms CM which are incorporated into the point-to-point traffic models: stepping aside (CM-SA) and choosing alternative routes (CM-CAR). Incorporating CM-SA is to prevent a type of ping-pong jumps from happening when two objects standing face-to-face want to move in opposite directions. Incorporating CM-CAR is to handle the conflict when more than one object competes for the same point in parallel update. We investigate and compare four models mainly from fundamental diagrams, jam patterns and the distribution of co-operation probability. It is found that although it decreases the average velocity a little, the CM-SA increases the critical density and the average flow. Despite increasing the average velocity, the CM-CAR decreases the average flow by creating substantially vacant areas inside jam clusters. We investigate the jam patterns of four models carefully and explain this result qualitatively. In addition, we discuss the advantage and applicability of decentralized co-operation modeling.

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