Location Of Circles Research Articles

«Велика мандрівка» «Пласту»: з Німеччини до Австралії

Insufficiently known pages from the history of Plast are considered in the article. They concern to the revival of the organization in the camps for prisoners of war – DPs – in Germany after World War II and the beginning of the organization activities in Australia. It is concluded that the formation of the first Plast circles during this period has been spontaneous and taken place within the framework of active social, political, cultural, religious and economic life of Ukrainians in the DP camps. The Union of Ukrainian Plast Emigrants (UUPE) leаded by commandant Atanas Figol has been revived to direct this process to organized course. During 1945–1948 he has conducted a number of meetings important for the further development of Plast. Organizational and ideological principles of its activities analyzed in the submitted research are formed at them. It is proved that the Congress in Aschaffenburg of 1948 has become the milestone event for Plast. It has taken place as a part of celebration of the 35th anniversary of the organization creation. Taking into account the beginning of the relocation of many Ukrainians to the places of the new settlement, the Congress has been held under the slogan On a Long Journey to a Great Goal. It is found out that the main threats awaiting Ukrainians abroad in the understanding of the Plast leaders of this period are described. Attention is also paid to moral, spiritual and ideological heritage that Plast members should take in this journey; the requirements for physical development and national-patriotic education; the ideal of a young Ukrainian; ways of preservation of national and cultural space, etc. These guidelines have formed the basis for the development of Plast activities in Australia, where the first wave of Ukrainian emigrants arrive in 1948–1951. The main ways of their implementation, as well as the challenges faced by Ukrainians on the new continent territory are revealed. The names of the first Plast members in Australia, data on their number, location of circles, artistic groups in which they participate, are introduces into scientific circulation in the research.

Research on the Influencing Factors of Commercial Retail Location

City development hinges on the business activities within a city. The space structure of business activities is always an essential subject in urban geography and urban economics researches. As the progress of economical growth, the relationship between customers and big shopping malls becomes closer and closer. There are conspicuous differences and distinct spatial agglomeration among different types of business sites location. To be succinct, land price, traffic accessibility and feature aggregation are all important factors influencing the location of different business sites in diverse extent.This paper is aiming to analyze factors that influence the location of business sites and circles using analytic hierarchy process, in order to provide some reference significance for related issues.

An improved method for location of concentric circles in vision measurement

Abstract Target with concentric circles has been widely used in camera calibration and vision measurement systems. An improved method to accurately locate the real projection of the concentric circles center has been proposed in this paper. Compared with similar methods, this method is computational efficiency and has no requirement of the concentric circles’ radii. Several simulations have been carried out to explore the influence of image noises, rotation angle, inner radius, outer radius and circle number to the center location accuracy, and several quantitative or semi-quantitative conclusions have been obtained, which can guide the optimum design of concentric circle target. Verification experiment was designed and result shows it is about 0.0891 pixel in accuracy and has promoted the computational efficiency scores of times. Moreover, a planar calibration target was designed and used to calibrate a binocular stereovision system, and test result shows the RMS error of the system has been improved to 0.0284 mm.

The location and identification of concentric circles in automatic camera calibration

In order to eliminate user's interaction, a new method based on concentric circles pattern is proposed to calibrate a camera automatically and accurately. Firstly, the imaged centers of concentric circles are located using the principles of cross-ratio and pole–polar; secondly, different centers are identified by cross-ratio; finally, the topology of imaged centers is established to calibrate the camera automatically. The effectiveness and accuracy of the method is demonstrated by experiments with simulated and real images. It is shown that this method has high robustness and precision, can be efficiently used in many applications.

Sensitivity of LiDAR-derived three-dimensional shape signatures for individual tree crowns: a simulation study

Following previous research that demonstrates the effectiveness of three-dimensional (3D) shape signatures for characterizing individual tree crowns derived from Light Detection and Ranging (LiDAR) data, this letter presents a simulation study on the sensitivity of 3D shape signatures. Based on the observation of LiDAR point clouds for tree crowns, a mathematical model is designed to generate simulation data. Factors affecting LiDAR-derived 3D shape signatures of individual tree crowns are then tested, including the number of points, the size and location of sampling circles and the influence of neighbouring crowns. The results suggest that it is possible to obtain 3D shape signatures of individual crowns based on automated treetop detection, and that a combination of multiple sample circles may provide more reliable results than single sample circles in characterizing 3D crown shapes.

Statistical design for the location of planes and circles when using a probe

A statistical approach to the problem of establishing the location of planes and circles by use of a touch-trigger probe mounted on a machining centre is presented. Equations for determining the minimum number of measurements to make and their location in order to locate a part within a specified confidence interval are given. An explicit solution to the parameter estimation problem for the circle is derived, and its properties are compared with solutions from two other methods. It is shown that one of the methods has an estimator whose accuracy does not improve as the number of measurements made is increased because the probe can move only along cartesian axes when it is mounted on a machining centre.