scholarly journals Kinematic projection in modern technologies

2021 ◽  
Vol 23 (96) ◽  
pp. 67-75
Author(s):  
I. G. Svidrak ◽  
I. S. Aftanaziv ◽  
O. I. Strogan ◽  
A. O. Shevchuk
Keyword(s):  
Moving Objects ◽  
Image Plane ◽  
Spatial Location ◽  
Picture Plane ◽  
Movement Trajectory ◽  
Radio Waves ◽  
Practical Application ◽  
Modern Computer ◽  
Projection Center ◽  
Object Form

The trajectories and coordinates of unmanned aircrafts spatial location determination is researched with the help of kinematic projection means. The methodology offered below considers the formation of two mobile and independent kinematic projection centers raised into the air by drones. The electromagnetic radio waves emitted by them, penetrating an unknown aircraft object, form two independent projecting rays intersecting at the searched aircraft location point. In this case, the searched object spatial location instantaneous (at a certain point in time) point will be placed on an imaginary “picture plane” on a line connecting the points projections generated by drones interceptors projecting rays. As far as all of the projection objects in this case are movable, all the moving trajectory projection of the searched aircraft will be displayed on the monitor. The introduction of another “picture plane”, perpendicular to the main one, will help to build an axonometric mapping not only for projections, but also for the aircraft spatial movement trajectory itself. Each point of this trajectory gives an information about the “instantaneous” coordinates of the aircraft spatial location. The method of application of kinematic projection for display of a trajectory of movement and search of coordinates of moving objects is described. In kinematic projection, all its key components, namely the object, the center of projection, the image plane and the projecting rays, are in continuous motion with certain speeds and accelerations. Kinematic projection deepens the field of practical application of descriptive geometry. This is confirmed by the example of practical application of kinematic projection presented in the article for improvement of remote control of tillage equipment in automated land treatment complexes. The main technical support for the practical application of kinematic projection are stationary radio towers or unmanned aerial vehicles (BPLA), such as drones. They are equipped with video cameras and electromagnetic radiation devices. This equipment serves as a center of kinematic projection. The projecting rays generated by the projection center will be received by a stationary command post (center). It is equipped with a radar system (radar) and modern computer equipment with appropriate software. This equipment, in this case, performs the function of a “picture plane”, which will reflect the trajectory of agricultural machinery. Actuators and controls of the movement of tillage equipment are equipped with receivers of control radio waves and means of automated control. The use of kinematic projection helps to improve the quality of tillage. This is ensured by the fact that its use is carried out automatically and eliminates possible errors of operators. Kinematic projection can also be used in military affairs to detect enemy drones in the airspace. In this case, use a kind of kinematic projection with its two centers of generation of projecting rays. This is an example of the solution of the so-called “inverse problem” of kinematic projection, which provides the ability to search for the coordinates of the motion of the projected object at a known trajectory of its motion. The main advantage of kinematic projection is the ability to identify and display an object on a computer screen not only in a flat view, but also taking into account its spatial coordinates.

scholarly journals Numerical Examination of Photon Recycling as an Explanation of Observed Carrier Lifetime in Direct Bandgap Materials

VLSI Design ◽  
1998 ◽  
Vol 8 (1-4) ◽  
pp. 153-157 ◽  
Author(s):  
Joseph W. Parks ◽  
Kevin F. Brennan ◽  
Arlynn W. Smith
Keyword(s):  
Carrier Lifetime ◽  
Spatial Location ◽  
Practical Application ◽  
Radiative Recombination Rate ◽  
Carrier Generation ◽  
Spectral Content ◽  
Carrier Lifetimes ◽  
Photon Recycling ◽  
Effective Carrier ◽  
Numerical Examination

Photon recycling is examined as an explanation for the observed large carrier lifetimes in an InP/InGaAs photodiode. This effect extends the effective carrier lifetime within a device by re-absorbing a fraction of the photons generated through radiative band-toband recombination events. In order to predict the behavior of this carrier generation, photon recycling has been added to our two-dimensional macroscopic device simulator, STEBS-2D. A ray-tracing preprocessing step is used to map all of the possible trajectories and absorption of various wavelengths of emitted light from each originating node within the device. The macroscopic simulator uses these data to determine the spatial location of the re-absorbed radiation within the geometry of the device. By incorporating the ray tracer results with the total quantity and spectral content of recombined carriers at each node within the simulation, the recycled generation rate can be obtained. A practical application of this model is presented where the effects of photon recycling are used as a possible explanation of the discrepancy between the theoretically predicted and experimentally observed radiative recombination rate in a double heterostructure photodetector.

scholarly journals ПІДГОТОВКА МАЙБУТНІХ СОЦІОЛОГІВ ДО КОМП’ЮТЕРНОГО АНАЛІЗУ ДЕМОГРАФІЧНИХ ПРОЦЕСІВ І СТРУКТУР

2018 ◽  
Vol 65 (3) ◽  
pp. 166
Author(s):  
Liubov F. Panchenko
Keyword(s):  
Graphical Representation ◽  
Demographic Data ◽  
Practical Application ◽  
Population Pyramid ◽  
Computer Tools ◽  
Modern Computer ◽  
Age Pyramid ◽  
Demographic Processes ◽  
Independent Work ◽  
Modern Era

In the modern era of digital globalization, it is becoming more and more important to train sociology students in the field of demographics and demographic statistics based not only on demographic theories but also on the practical application of the new computer tools and technologies, databases and Internet services. The article analyzes the capabilities of modern computer tools for the analysis of demographic processes and structures in training sociology students; substantiates the use of the R environment as a tool for analysis and graphical representation of demographic data. It presents the idea of teaching students to perform computer analysis of demographic data using a combination of Excel spreadsheets, SPSS statistical package, R environment illustrated by two examples. The first example concerns building and comparing the gender-age pyramid of the population of Ukraine at different years and includes searching for the relevant data, building the pyramid using standard diagram building Excel tools, using SPSS tools (Chart Builder, Histogram, Population Pyramid), and using pyramid package of R environment. The second example relates to calculation of childcare and grandparent care load coefficients, visualizing their dynamics, and includes an introduction to the demographic passport of Ukraine. The article presents the developed methodological support for teaching sociology students to perform demographic data analysis, including presentation-lectures on the fundamental principles of work in R and R Studio environment, laboratory works (theory summary, detailed operative instructions, control questions, tasks for students ‘ independent work); data packages attached to every assignment. The author has analyzed the didactic capabilities of the free Gapminder service that includes the list of the tools titled `Play with Data`, bubble chart, maps, ranking, trends, age pyramids. This provides colorful and dynamic data visualization for chosen demographic criteria (depending on the research objectives) by countries and continents over time that stimulates the students to conduct additional scientific research.

scholarly journals A BOOK RETRIEVAL AND LOCATION SYSTEM BASED ON REAL-SCENE 3D

2019 ◽  
Vol XLII-2/W13 ◽  
pp. 903-908
Author(s):  
S. Wei ◽  
B. Li ◽  
Z. Guo ◽  
S. Guo ◽  
L. Cheng
Keyword(s):  
Indoor Environment ◽  
Moving Objects ◽  
Spatial Location ◽  
Building Structures ◽  
Human Beings ◽  
Location System ◽  
3D Space ◽  
Real Scene ◽  
3D Information ◽  
Indoor And Outdoor

<p><strong>Abstract.</strong> With the development of urbanization, the building structures are more and more complex, and various moving objects, such as human beings, robots and unmanned aerial vehicles, often travel through indoor and outdoor 3D space, which puts forward higher requirements for the accurate search and location in indoor and outdoor space. At present, most of the spatial location methods for indoor entities are carried out through 2D maps. However, the indoor environment is a complex 3D space, which increases the difficulty of the search process. In addition, 2D map cannot accurately display the 3D spatial position of the entity. Therefore, it is difficult for 2D maps to search and locate in complex environment. Therefore, how to quickly and effectively carry out spatial location query in complex indoor environment has become an urgent problem to be solved. Taking the library of Beijing University of Civil Engineering and Architecture as an example, this paper obtains the indoor 3D information of the library based on SLAM, processes and publishes the acquired 3D information on IndoorViewer, and uses its API in the book retrieval system. Finally, a book retrieval and location system based on real-scene 3D is finished.</p>

scholarly journals Fusing Multimodal Video Data for Detecting Moving Objects/Targets in Challenging Indoor and Outdoor Scenes

2019 ◽  
Vol 11 (4) ◽  
pp. 446 ◽  
Author(s):  
Zacharias Kandylakis ◽  
Konstantinos Vasili ◽  
Konstantinos Karantzalos
Keyword(s):  
Object Detection ◽  
Moving Objects ◽  
Local Coordinate System ◽  
Image Plane ◽  
Hyperspectral Data ◽  
Video Data ◽  
Outdoor Scenes ◽  
Indoor Scenes ◽  
Video Sensors ◽  
Indoor And Outdoor

Single sensor systems and standard optical—usually RGB CCTV video cameras—fail to provide adequate observations, or the amount of spectral information required to build rich, expressive, discriminative features for object detection and tracking tasks in challenging outdoor and indoor scenes under various environmental/illumination conditions. Towards this direction, we have designed a multisensor system based on thermal, shortwave infrared, and hyperspectral video sensors and propose a processing pipeline able to perform in real-time object detection tasks despite the huge amount of the concurrently acquired video streams. In particular, in order to avoid the computationally intensive coregistration of the hyperspectral data with other imaging modalities, the initially detected targets are projected through a local coordinate system on the hypercube image plane. Regarding the object detection, a detector-agnostic procedure has been developed, integrating both unsupervised (background subtraction) and supervised (deep learning convolutional neural networks) techniques for validation purposes. The detected and verified targets are extracted through the fusion and data association steps based on temporal spectral signatures of both target and background. The quite promising experimental results in challenging indoor and outdoor scenes indicated the robust and efficient performance of the developed methodology under different conditions like fog, smoke, and illumination changes.

scholarly journals GENERAL CONCEPT OF CLUSTERING GEOMETRIC OBJECTS

2019 ◽  
pp. 63-69
Author(s):  
M. V. MYKYTAS ◽  
P. P. TESLENKO ◽  
S. I. KUSHNIR
Keyword(s):  
Construction Industry ◽  
Computer Aided Design ◽  
Information Technologies ◽  
Organizational Structures ◽  
General Concept ◽  
Practical Application ◽  
Theoretical Concepts ◽  
Modern Computer ◽  
Geometric Objects ◽  
Aided Design

Purpose. The article outlines the basic theoretical concepts of the general concept of clustering geometric objects, analyzes some areas of its effective practical application. Methodology. To achieve this goal, the authors analyzed some areas of effective practical application of the concept of clustering geometric objects. Relevant examples of modeling cluster organizational structures of the architectural and construction industry were considered. Findings. The relevance of the research performed is substantiated, the advantages of the developed approach are emphasized, in particular, its versatility and flexibility, openness to development, and its adaptability to the implementation of modern computer tools. Prospects for further research in this area are identified. Originality. It was established that the concept can be an effective component of computer information technologies for computer-aided design of various technical objects, in particular, in BIM-technologies. Practical value. Relevant examples of modeling cluster organizational structures of the architectural and construction industry were considered.

An Exploration with Novel Shape Signature of GMSC Distance Function to Track the Object

2015 ◽  
Vol 15 (04) ◽  
pp. 1550014 ◽  
Author(s):  
M. H. Sidram ◽  
Nagappa U. Bhajantri
Keyword(s):  
Distance Function ◽  
Moving Objects ◽  
Geometric Mean ◽  
Image Plane ◽  
Distance Functions ◽  
Boundary Edge ◽  
Shape Signature ◽  
Tracking Process ◽  
Centroid Distance ◽  
Centroid Distance Function

The process explicitly dedicated to estimate the path of the object as it moves along the region of scene in the image plane is the principle of tracking. In other words, it is a strategy to detect and track moving object through a sequence of frames. In this work, optical flow based on Horn–Schunk with Barren, Fleet and Beuchemin (BFB) kernel has been employed to estimate the motion vectors. The peripheries of moving objects are extracted for different shape signatures such as boundary, edge, area, curvature and centroid distance functions. Fourier descriptors (FD) of particular shape signature for each of the candidate templates and model template are computed. Similarity between the model template and candidate templates is confirmed by corresponding minimum Minkowski distance (MD). Subsequently, best match candidate template will be updated by model template in view of tracking process. However, centroid distance function has remarked some potentials and hence it has further motivated to mine it to throw in the proposed novel criteria such as the geometric mean of segmented centroid (GMSC) distance function to track the object. The proposed method of GMSC distance function has shown significant change in the tracking outcome.

scholarly journals Radiofrequency Technologies of Local Positioning in Healthcare

2020 ◽  
Vol 23 (3) ◽  
pp. 62-79
Author(s):  
D. S. Bragin ◽  
I. V. Pospelova ◽  
I. V. Cherepanova ◽  
V. N. Serebryakova
Keyword(s):  
Moving Objects ◽  
Data Transfer ◽  
Indoor Positioning ◽  
Radio Waves ◽  
Good Communication ◽  
Medical Facilities ◽  
Medical Sensors ◽  
Bibliographic Retrieval ◽  
Hospital Building ◽  
Quality Of Medical Care

Introduction. Localization of objects position in closed space plays an important role in many areas of human activity, including medicine. Using indoor-positioning technologies as a part of telemedicine systems allows one to improve the quality of medical care and to reduce mortality of patients. Therefore, indoor-positioning technologies contribute to achieve the goals outlined in the Russian Federation government`s program "Healthcare development". Aim. To study the applicability of modern radiofrequency technologies for localization of patients inside a hospital building. Materials and methods. Scientific sources devoted to indoor-positioning based on radiofrequency technologies were analyzed. The methods used included: - bibliographic retrieval; - selection and verification of sources based on their relevance; - analysis of sources by methods of deconstruction and comparative analysis . Results. The result of the analysis indicated that radiofrequency positioning technologies allow one to locate objects using radio waves properties. The disadvantage of the technology is the penetration of radio signal through walls and floors. Given this, it is necessary to use complex algorithms to detect an object with accuracy to a specific room. Despite this disadvantage, radiofrequency technologies can be used for positioning in medical facilities since they are easy in deployment and service. Also, they are used in ready-made commercial solutions. ZigBee technology is an exception because it does not allow one to track moving objects in real-time. Conclusion. Based on the study it was concluded that BLE technology is the most suitable for indoor-positioning in medical facilities. It is energy-efficient, it has sufficiently fast data transfer rate, good communication radius and a large range of ready-made communication equipment. It is also worth noting that most wireless medical sensors exchange data via the BLE interface.

An improved method for swing measurement based on monocular vision to the payload of overhead crane

2020 ◽  
pp. 014233122092131
Author(s):  
Jinling Huang ◽  
Weimin Xu ◽  
Weiwei Zhao ◽  
Hesong Yuan
Keyword(s):  
Real Time ◽  
Moving Objects ◽  
Mean Shift ◽  
Region Of Interest ◽  
Image Plane ◽  
Overhead Crane ◽  
Diagram Method ◽  
Mean Shift Algorithm ◽  
Swing Angle ◽  
Motion Speed

In order to solve the problem that the blurred image of a moving object decreases accuracy in the process of detecting the payload swing angle of an overhead crane based on vision, and the tracking failure caused by the drastic change of grey targets, a robust real-time detection method of the load swing angle of a bridge crane is proposed. This method uses a spherical marker attached to the load, which is insensitive to rotation and tilt when it is detected. First, it uses the mean shift algorithm combined with Kalman filter to track the moving objects in the image plane continuously, and then integrates the method of minimum area circle to detect the spherical marker image in the region of interest accurately and quickly. Finally, combined with the geometric method, the real-time swing angle is calculated. In addition, the angle diagram method is used to increase the speed of calculating the swing angle. The experimental results show that the method is effective for detecting the load target swing angle of different trolley motion speed.

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