Wyniki wyszukiwania - BazTech

1

An optimal innovation based adaptive estimation Kalman filter for accurate positioning in a vehicular ad-hoc network

Sumithra S., Vadivel R.

International Journal of Applied Mathematics and Computer Science

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2021

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Vol. 31, no. 1

45--57

EN

The vehicular ad-hoc network (VANET) is subject to various attacks because of its dynamic nature and ephemeral character. In VANET, vehicles communicate with each other for safety awareness. The positioning of an unknown vehicle is one of the critical factors to determine the vehicle’s trustworthiness. Although some positioning techniques have achieved a high accuracy level in VANET, they suffer from dynamic noise in real-world environments. This drawback leads to inaccuracy and unreliability during vehicle positioning. In this paper, an optimal innovation based adaptive estimation Kalman filter (OIAE-KF) is proposed. This algorithm offers an alternative solution for the basic Kalman filter and the innovation based adaptive estimation Kalman filter (IAE-KF). The proposed algorithm makes use of fusion of the global navigation satellite system (GNSS) and the inertial measurement unit (IMU) to improve its performance. The OIAE-KF works based on the innovation sequence and involves three steps such as establishing the innovation sequence, applying the innovation property, checking the optimality of the Kalman filter and, finally, estimating process noise (Q) and measurement noise (R). An optimal swapping method is introduced for optimality check. The efficiency of the proposed OIAE-KF method is proved by comparing the predictions of the existing methods such as the IAE-KF. The results show that the OIAE-KF performs better than the existing techniques. It improves the accuracy and consistency in VANET positioning.

2

Common driving notification protocol based on classified driving behavior for cooperation intelligent autonomous vehicle using vehicular ad-hoc network technology

Lin, C.-H. C.-H., Dong F. -Y., Hirota K.

Journal of Artificial Intelligence and Soft Computing Research

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2015

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Vol. 5, No. 1

5--21

EN

A protocol, called common driving notification protocol (CDNP), is proposed based on the classified driving behavior for intelligent autonomous vehicles, and it defines a standard with common messages and format for vehicles. The common standard format and definitions of CDNP packet make the autonomous vehicles have a common language to exchange more detail driving decision information of various driving situations, decrease the identification time for one vehicle to identify the driving decisions of other vehicles before or after those driving decisions are performed. The simulation tools, including NS- 3 and SUMO, are used to simulate the wireless data packet transmission and the vehicle mobility; the experiment results present that the proposed protocol, CDNP, can increase the reaction preparing time with maximum value 250 seconds, decrease the identification time and the average travel time. Prospectively, it is decided to implement the CDNP as a protocol stack in the Linux kernel to provide the basic protocol capability for real world transmission testing.

3

Domain Modeling in the Context of Ontology

Dubielewicz I., Hnatkowska B., Huzar Z., Tuzinkiewicz L.

Foundations of Computing and Decision Sciences

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2015

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Vol. 40, No. 1

3--15

EN

The domain knowledge represented by ontology should be widely used in the design process of information system. The aim of the paper is to outline a systematic approach of developing a CIM model (domain model, precisely) on the basis of a selected domain ontology. There are presented some hints how ontology concepts can be expressed in domain model. Elaborated example realizes some difficulties in proposed approach, e.g. the domain knowledge is spread over many ontologies, some facts are defined at very general level (their interpretation is more difficult), ontology may contain many irrelevant elements. Nevertheless, we are believed that applying ontology in conscious way can help to achieve higher compliance of the domain model with the application domain.

4

Junction turning ratios route planner module for Transims

Maciejewski M.

Transport Problems

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2011

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T. 6, z. 2

13-20

EN

The paper presents Junction Turning Ratios Route Planner (JTRRouter) for TRANSIMS that enables to generate fast route plans for vehicles on the basis of traffic measurements conducted at intersections. First, TRANSIMS system was introduced. Afterwards a general design, functionality, and requirements of JTRRouter were described. The authors presented a sketch of the route planning algorithm and discussed its computational complexity. In order to illustrate the most essential capabilities of the module, the authors presented an example of route planning for a fragment of a real urban network.

PL

W artykule przedstawiono moduł planowania marszrut (JTRRouter) dla systemu TRANSIMS na podstawie rozkładów natężeń ruchu na skrzyżowaniach. Moduł ten pozwala na szybką generację planów marszrut przy wykorzystaniu wyników pomiarów. W pierwszej kolejności przedstawiono system TRANSIMS, a w dalszej części opisano ogólny projekt, funkcjonalność oraz wymagania modułu JTRRouter. Następnie autorzy zaprezentowali szkic algorytmu planowania marszrut i omówili jego złożoność obliczeniową. W celu zilustrowania najistotniejszych możliwości aplikacji autorzy przedstawili przykład planowania marszrut dla fragmentu rzeczywistej miejskiej sieci drogowej.

5

A comparison of microscopic traffic flow simulation systems for an urban area

Maciejewski M.

Transport Problems

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2010

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T. 5, z. 4

27-38

EN

The paper compares the results of an application of three selected systems (TRANSIMS, SUMO, and VISSIM) to the microscopic simulation of traffic flow for a fragment of a real urban road network. First, the problem of traffic flow modeling and simulation was described, and the selected systems were introduced. Afterwards, model construction and simulation were presented. The authors discussed an issue of model calibration, and then conducted a comparative result analysis for the three systems, with a reference to the real traffic. The paper ends with a summary of the conducted research.

PL

W artykule porównano wyniki zastosowania trzech wybranych systemów (TRANSIMS, SUMO i VISSIM) do przeprowadzania mikroskopowej symulacji przepływu ruchu drogowego dla rzeczywistego fragmentu miejskiej sieci drogowej. W pierwszej kolejności nakreślono zagadnienie modelowania i symulacji ruchu oraz przedstawiono wybrane systemy. W dalszej części opisano przebieg prac nad modelami, a następnie wyniki symulacji wraz z omówieniem procesu kalibracji modeli. Następnie autorzy dokonali krótkiej analizy porównawczej wyników i odnieśli je do rzeczywistego ruchu drogowego. Artykuł kończy podsumowanie zrealizowanych prac.

6

Zastosowanie automatów komórkowych do symulacji ruchu drogowego w mieście

Maciejewski M., Maciejewski M.

Logistyka

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2010

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nr 2

PL

W artykule przedstawiono problemy zastosowania automatów komórkowych do przeprowadzania mikroskopowego modelowania i symulacji przepływu ruchu drogowego dla rzeczywistego fragmentu sieci. W pierwszej kolejności nakreślono problematykę modelowania i symulacji ruchu oraz przedstawiono system TRANSIMS. W dalszej części opisano przebieg prac nad modelem, a następnie wyniki symulacji wraz z omówieniem procesu kalibracji modelu. Następnie autorzy dokonali krótkiej analizy wyników i odnieśli je do stanu rzeczywistego oraz rezultatów otrzymanych przy zastosowaniu systemu SUMO. Artykuł kończy podsumowanie zrealizowanych prac.

EN

The paper concerns an application of cellular automata to microscopic modeling and simulation of urban traffic flow on a fragment of a real road network. First, the problem of traffic flow modeling and simulation, and TRANSIMS system were introduced. Afterwards, a process of model construction and simulation results were presented. The authors discussed the issue of model calibration, and then conducted a results analysis, with a reference to the real state, and with a comparison to the outcome obtained by means of SUMO system. The paper ends with a summary of the conducted research.

7

Mikrosymulacja ruchu drogowego dla obszaru miejskiego z zastosowaniem systemu VISSIM

Maciejewski M., Maciejewski M.

Logistyka

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2010

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nr 4

CD-CD

PL

W artykule przedstawiono problematykę zastosowania systemu VISSIM firmy PTV do przeprowadzania mikroskopowego modelowania i symulacji przepływu ruchu drogowego dla rzeczywistego fragmentu sieci. W pierwszej kolejności nakreślono zagadnienie modelowania i symulacji ruchu oraz przedstawiono system VISSIM. W dalszej części opisano przebieg prac nad modelem, a następnie wyniki symulacji wraz z omówieniem procesu kalibracji modelu. Następnie autorzy dokonali krótkiej analizy wyników i odnieśli je do stanu rzeczywistego oraz rezultatów otrzymanych we wcześniejszych pracach przy zastosowaniu systemów SUMO i TRANSIMS. Artykuł kończy podsumowanie zrealizowanych prac.

EN

The paper concerns an application of VISSIM system by PTV to microscopic modeling and simulation of urban traffic flow on a fragment of a real road network. First, the problem of traffic flow modeling and simulation, and VISSIM system were introduced. Afterwards, a process of model construction and simulation results were presented. The authors discussed the issue of model calibration, and then conducted a results analysis, with a reference to the real state, and with a comparison to the outcome previously obtained with an application of SUMO and TRANSIMS systems. The paper ends with a summary of the conducted research.

8

Upper ontology based method for ontologies matching improvement

Łuszpaj A., Nawarecki E., Zygmunt A., Koźlak J., Dobrowolski G.

Systems Science

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2008

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Vol. 34, no 1

85-96

EN

Correct placement of domain ontologies in the upper ontology structure may significantly improve the ontology matching techniques. The main idea of the algorithm presented relies on defining all undefined concepts within the domain ontology on the basis of general upper ontology concepts. Although the method itself is lexical in nature, we believe it to be the step towards semantic integration of ontologies. Upper ontology is represented by SUMO (Suggested Upper Merged Ontology), aspiring to become a standard. The article also presents the results of quality tests of the algorithm proposed.