mobile objects
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Author(s):  
Andrzej Felski

The big modern ships are the largest mobile objects that exist in nowadays world. Their huge mass and length in combination with their limited maneuverability can result in the risk of extreme destructions of the infrastructure, as well as environment, in the case of even minor malfunction of any of its elements. The main danger is the kinetic energy of such a colossus and in these circumstances the accuracy of information on the ship's speed becomes particularly important. This is the reason of a growing interest in various systems designed to support harbor pilots during the maneuvers. The most popular ones are based on laser-measurement of the distance, as the rule, installed as static installation in the quay. This article presents the results of the experiments of vessel’s speed measurements when approaching the quay with use the geodetic total stations in a reflectorless variant.


2021 ◽  
Vol 5 (4) ◽  
pp. 42-48
Author(s):  
Valerii Chystov ◽  
Iryna Zakharchenko ◽  
Vladislava Pavlenko ◽  
Maksim Pavlenko

Currently, a large number of different mathematical models and methods aimed at solving problems of multidimensional optimization and modeling of complex behavioral systems have been developed. One of the areas of search for solutions is the search for solutions in conditions of incomplete information and the need to take into account changing external factors. Often such problems are solved by the method of complete search. In some conditions, the method of complete search can be significantly improved through the implementation and use of behavioral models of natural formations. Examples of such formations can be group behavior of insects, birds, fish, various flocks, etc. The idea of copying group activity of a shoal of fishes at the decision of problems of joint activity on extraction of food is used in work. The reasoning based on the simulation of the behavior of such a natural object allowed to justify the choice as a mathematical model - cellular automata. The paper examines the key features of such a model. Modeling of his work is carried out, strategies of behavior of group of mobile objects at search of the purposes are developed, key characteristics are investigated and the method of adaptive choice of strategy and change of rules of behavior taking into account features of the solved problem is developed. The search strategy is implemented in the work, which takes into account the need to solve the optimization problem on two parameters. The obtained results testify to the high descriptive possibility of such an approach, the possibility of finding the optimal strategy for the behavior of the cellular automaton and the formalization of the process of selecting the parameters of its operation. A further improvement of this approach can be the implementation of simulation to study the properties of the developed model, the formation of the optimal set of rules and parameters of the machine for the whole set of tasks.


2021 ◽  
Vol 50 (4) ◽  
pp. 769-785
Author(s):  
Zhong Hong ◽  
Jian-Min Jiang ◽  
Hongping Shu

As a safety-critical issue in complex mobile systems, isolation requires two or more mobile objects not to appear in the same place simultaneously. To ensure such isolation, a scheduling policy is needed to control and coordinate the movement of mobile objects. Unfortunately, existing task scheduling theories fails in providing effective solutions, because it is hardly possible to decompose a complex mobile system into multiple independent tasks. To solve this problem, a more fine-grained event scheduling is proposed in this paper to generate scheduling policies which can ensure the isolation of mobile objects. After defining event scheduling based on event-based formal models called dependency structures, a new event scheduling theory for mobile systems is developed accordingly. Then an algorithm for generating an event scheduling policy is proposed to implement the required isolation. Simulation experiments are conducted to prove the result of our theoretical analysis and show the effectiveness and scalability of the approach.


Mathematics ◽  
2021 ◽  
Vol 9 (24) ◽  
pp. 3167
Author(s):  
Sergey Korchagin ◽  
Ekaterina Romanova ◽  
Denis Serdechnyy ◽  
Petr Nikitin ◽  
Vil Baiburin ◽  
...  

The authors carried out modeling of the electrophysical properties of composite media. The frequency dependences of the dielectric constant on the type of inclusions in the composite are investigated. On the basis of the nanocomposite considered in the work, based on Si, B, and SiO2, the authors model a reflecting screen, the lattice elements of which have a layered hierarchically constructed structure similar to a fractal formation. The influence of the level of fractality on the optical properties of the object was also investigated, and it was found that the proposed structure makes it possible to increase the operating frequency range of the reflecting screen and the efficiency, in comparison with reflecting screens that have a lattice of traditional structure. The results obtained can be of practical interest for broadband and nonlinear radar devices, localization devices and mobile objects, microelectronics, as well as intelligent applications in the field of information security.


Author(s):  
В.И. Павлов ◽  
Т.Ю. Дорохова ◽  
С.В. Толстых

Эффективность информационно-измерительных систем, применяемых в таких областях как радиолокация, связь, во многом зависит от их устойчивости к действию преднамеренно создаваемых помех. В статье рассматривается подход к повышению помехоустойчивости информационно-измерительных систем путем адаптации их структуры к изменениям сигнально-помеховой обстановки. Методами теории оптимизации динамических систем случайной структуры синтезирован алгоритм управления структурой информационно-измерительной системы, в состав которой входит радиолокационная станция. Показаны структурные схемы вновь разрабатываемых устройств. Приведены результаты исследования разработанного алгоритма управления структурой информационно-измерительной системы, подверженной действию организованных помех, подтверждающие его практическую значимость. Результаты исследований могут быть использованы при разработке информационно-измерительных и управляющих систем в области управления воздушным движением, самонаведения подвижных объектов, в связных и навигационных системах, других системах, располагающих открытыми входными информационными каналами. The effectiveness of information and measurement systems used in such areas as radar, communications, largely depends on their resistance to the action of deliberately generated interference. The article discusses an approach to increasing the noise immunity of information-measuring systems by adapting their structure to changes in the signal-interference environment. Using the methods of the theory of optimization of dynamic systems of random structure, an algorithm for controlling the structure of an information-measuring system, which includes a radar station, has been synthesized. The block diagrams of newly developed devices are shown. The results of the study of the developed algorithm for controlling the structure of the information-measuring system exposed to organized interference are presented, confirming its practical significance. The research results can be used in the development of information-measuring and control systems in the field of air traffic control, homing of mobile objects, in communication and navigation systems, and other systems with open input information channels.


InterConf ◽  
2021 ◽  
pp. 249-264
Author(s):  
Oleksandr Brytov ◽  
Danil Belyaev ◽  
Olieksii Rasstryhin ◽  
Oleh Shknai ◽  
Oleksii Zvieriev ◽  
...  

Electronic methods and means of reconnaissance are a set of methods and organizational structures for conducting intelligence activities using electronic equipment and radio-technical devices (systems). The development of modern element base and computing facilities allows us to miniaturize modern facilities, introducing into them previously inaccessible algorithms and methods for processing the information received. This allows real-time monitoring of potentially dangerous (threatening) stationary and mobile objects, promptly responding to emerging terrorist threats and other dangerous phenomena. On the paper briefly discusses the main modern methods and means of electronic intelligence for special purposes, used in practice.


Author(s):  
Д.Г. Пантенков ◽  
В.П. Литвиненко

Современные сложные радиотехнические комплексы и системы входят в состав ракетно-космических, авиационных, сухопутных, морских изделий, обеспечивающих решение задач повышения обороноспособности и безопасности РФ, а также отвечающих интересам гражданских потребителей. При этом на этапе проектирования радиотехнических комплексов и систем закладываются требуемые расчетные параметры по надежности, безопасности, долговечности, технологичности в целях обеспечения требуемого срока их эффективного функционирования для решения поставленных целевых задач. Рассмотрены результаты математического моделирования надежности проектируемых станций спутниковой связи на подвижных объектах (космические аппараты, беспилотные летательные аппараты, автомобили, железнодорожные поезда), которые отражают методический подход к определению надежности комплекса или системы верхнего уровня. Принципиальным моментом является возможность определения числовых значений данного показателя еще на этапе составления тактико-технических (технических) заданий на выполнение НИОКР, проведения аванпроекта, т.е. тех этапах работ, на которых цена ошибки не является существенной и имеется принципиальная возможность внести изменения в конструктивные и схемотехнические параметры разрабатываемых радиотехнических комплексов и систем Modern complex radio communication and systems are part of rocket-space, aviation, dry-track, marine products that provide the solution of tasks both to increase the defense and safety of the Russian Federation and meet the interests of civilian consumers. At the same time, at the stage of design of radio engineering complexes and systems, the required design parameters for reliability, safety, durability, technological and technical support are laid in order to ensure the required period of their effective functioning to solve the set target tasks. This article considers the results of mathematical modeling of reliability of projected satellite communication stations on mobile objects (spacecraft, unmanned aerial vehicles, cars, railway trains), which reflect the methodological approach to determine the reliability of the complex or upper-level system. A fundamental point is the possibility of determining the numerical values of this indicator even at the stage of compiling tactical and technical (technical) tasks for R&D, conducting an advance project, i.e. those stages of work at which the error price is not significant and there is a fundamental possibility to make changes to the design and schematic parameters of the developed radio systems and systems


Sensors ◽  
2021 ◽  
Vol 21 (20) ◽  
pp. 6835
Author(s):  
Lara Kallab ◽  
Richard Chbeir ◽  
Michael Mrissa

In the Web of Things (WoT) context, an increasing number of stationary and mobile objects provide functions as RESTful services, also called resources, that can be combined with other existing Web resources, to create value-added processes. However, nowadays resource discovery and selection are challenging, due to (1) the growing number of resources providing similar functions, making Quality of Resource (QoR) essential to select appropriate resources, (2) the transient nature of resource availability due to sporadic connectivity, and (3) the location changes of mobile objects in time. In this paper, we first present a location-aware resource discovery that relies on a 3-dimensional indexing schema, which considers object location for resource identification. Then, we present a QoR-driven resource selection approach that uses a Selection Strategy Adaptor (SSA) to form i-compositions (with i ∈N*) offering different implementation alternatives. The defined SSA allows forming resource compositions while considering QoR constraints and Inputs/Outputs matching of related resources, as well as resource availability and users different needs (e.g., optimal and optimistic compositions obtained using a scoring system). Analyses are made to evaluate our service quality model against existing ones, and experiments are conducted in different environments setups to study the performance of our solution.


2021 ◽  
Vol 27 (10) ◽  
pp. 521-530
Author(s):  
O. N. Maslov ◽  

The method of statistical simulation modeling (SSM) has been used to analyze the operating conditions and the efficiency of the physical protection system of a stationary object from the massive impact of unmanned aerial vehicles (drones). It is shown that the conditions of the problem correspond to the reflexive version of a two-sided von Neumann's mixed game. statistical risk-oriented characteristics for two variants of the object protection system implementation using force mechanical and electromagnetic effects on the "drones cloud" are determined. The possibilities and the prospects for using the results obtained using the SSM method are presented.


Author(s):  
Rusudan Gersamia

Preverb in Zan language groups (Megrelian and Laz languages) is a principal prefix which, in combination with verb roots and stems referring to dynamicity and stativity (in association with other functional elements), is involved in organizing of space, and by means of which we establish spatial relations.Similarly to other Kartvelian languages, spatial features, encoded in the Zan preverb, in fact describe a direction (landmark, path) of movement of a subject (figure) of motion and its relation with other im/mobile objects in space (person, thing). As different from simple ones, Zan derived preverbs provide information about topological or landscape features of a place; therefore, we refer to them as locative, while to simple ones – as orienting.


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