Wyniki wyszukiwania - BazTech

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Database and bigdata processing system for analysis of AIS messages in the netBaltic research project

Lewczuk M., Cichocki P., Woźniak J.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

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2017

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Vol. 21, No 4

321--331

EN

A specialized database and a software tool for graphical and numerical presentation of maritime measurement results has been designed and implemented as part of the research conducted under the netBaltic project (Internet over the Baltic Sea – the implementation of a multi-system, self-organizing broadband communications network over the sea for enhancing navigation safety through the development of e-navigation services.) The developed software allows tracing graphs of radio-connections between shore stations and vessels (offshore units), based on historical data including the traffic of ships and their specific parameters collected on the Baltic Sea during the last four years. It also enables preparation of data for network simulation experiments using AIS (Automatic Identification of Ships) and GPS (Global Positioning System) loggers installed on shore stations and vessels, taking into account a number of input parameters, such as: time range, coast station selection, ship flags based on MMSI numbers and types and ranges of possible communication technologies used (WiFi, WiMax, Radwin, LTE,etc.). The created tool has a multi-layer architecture that utilizes the Maria DB SQL database, the Apache2 WEB server, and a number of PHP applications. The runtime environment has been built on Linux Debian version 8 and the HP C7000 cluster of the 16 CPU x86_64 architecture. The modularity of the application allows parallel processing and, therefore, optimization of the computing cluster. The database contains more than 70 million records which enables simulation of various topologies (with multi-hop transmissions) and network operations depending on the transmission techniques being used. The database is fully scalable, and allows easy adding of further data collected during subsequent measurement sessions. Additionally, the use of virtualization tools facilitates the future migration to more efficient processing environments, in case of a significant increase in the volume of data. The data recorded in the database allows calculation of statistics for the surveyed networks, and determining the incidence of potential network nodes (e.g. by flag) complete with their available communication techniques – information which is important in determining structures of possible multi-hop networks and their performance. The software finds routes for datagrams according to accepted criteria and exports results to a network traffic simulator, and as such is an important part of the framework used for planning next measurement campaigns and determining which communications equipment would be more suitable for vessels.

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Analiza sprężystej płyty na palach z uwzględnieniem krzywej aproksymującej wyniki testów statycznych pali

Meyer Z., Cichocki P.

Inżynieria Morska i Geotechnika

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2017

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nr 3

117--124

PL

Metoda analizy sprężystej płyty na palach z uwzględnieniem krzywej Meyera-Kowalowa. Eksperymenty numeryczne przeprowadzone na płycie spoczywającej na palach i gruncie. Wyniki analizy wpływu sztywności płyty na jej ugięcie, stopień mobilizacji naprężenia wokół pali oraz udziału pali w przekazywaniu obciążenia.

EN

A method of analysis of the elastic raft on piles, taking into account the MeyerKowalow curve. Numerical experiments carried out on a raft resting on piles and ground. The results of the analysis of the impact of the raft rigidity on its deflection, degree of mobilization of stress around the piles and the load distribution between the piles and raft.

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Systemy akwizycji, przetwarzania i wizualizacji danych AIS na potrzeby projektu netBaltic

Lewczuk M., Hoeft M., Cichocki P., Woźniak J., Nowicki K.

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

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2016

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nr 12

1326--1329

PL

System AIS (Automatic Identification System), zaprojektowany dla zapewnienia bezpieczeństwa żeglugi, służy do przekazywania w swoich komunikatach, wymienianych między jednostkami pływającymi, istotnych informacji geolokalizacyjnych. Znaczenie tych informacji wydaje się duże w kontekście planów budowy testowej instalacji, szerokopasmowej sieci teleinformatycznej netBaltic na morzu. W artykule przedstawione wyniki dotyczące budowy systemu akwizycji danych oraz oceny przydatności komunikatów systemu AIS do wizualizacji i dynamicznego modelowania grafów powiązań między statkami, w tym z uwzględnieniem zasięgów zapewnianych przez wybrane technologie sieciowe.

EN

AIS (automatic Identification System) is a solution designed to improve safety of navigation, by providing ships with al crucial capability of automatically exchanging messages relevant to their geographic location. Apart from its direct use for maritime safety purposes, such functionality seems to be very useful for the netBaltic project, aiming to provide means of a broadband data communication at sea. The paper describes a data acquisition system created for the purpose of utilizing AIS information for in the above task, as well as an assessment of suitability of AIS messages for visualization and modeling of dynamic graphs of inter-ship connections, taking into account communication ranges offered by selected wireless network technologies.

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Ocena przydatności systemu AIS w doborze tras rutingowych w sieciach bezprzewodowych o architekturze mesh na obszarze Bałtyku

Lewczuk M., Cichocki P., Woźniak J.

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

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2016

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nr 8-9

734--740

PL

Celem artykułu jest przybliżenie wyników jednego z kierunków prac prowadzonych w Katedrze Teleinformatyki Wydziału ETI Politechniki Gdańskiej w ramach projektu NetBaltic. Zaprezentowano w nim wstępne wyniki dotyczące systemu akwizycji danych oraz oceny przydatności systemu AIS do dynamicznego modelowania grafów powiązań miedzy statkami, z uwzględnieniem zasięgów zapewnianych przez wybrane technologie sieciowe, a także określania na tej podstawie parametrów wejściowych symulacji pracy takiej sieci, a wreszcie do stworzenia modelu i metryk rutingowych wzbogaconych danymi geolokalizacyjnymi. pochodzącymi z komunikatów AIS.

EN

The aim of the paper is to provide preliminary results of one d research directions conducted at the Computer Communications Department, Faculty of Electronics, Telecommunications and Informatics, Gdańsk University of Technology in the "NetBaltic" project. The paper presents some results concerning a data acquisition system together with evaluation of the AIS system suitability for dynamic modeling of a graph connections representing transmission links between vessels, obtained with the use of selected networking technologies. The data collected by the acquisition system will allow to determine input parameters used for more advanced maritime mesh network simulations as well as to create routing model with metrics enriched by geo-localization data, derived from AIS messages.

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Wpływ zasięgu strefy aktywnej naprężeń na sztywny fundament płytowo-palowy

Meyer Z., Cichocki P.

Inżynieria Morska i Geotechnika

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2015

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nr 4

601--608

PL

Analiza wpływu zasięgu strefy aktywnej płyty fundamentowej na rozdział obciążenia pomiędzy płytę a pal oraz osiadanie fundamentu płytowo-palowego (FPP). Wpływ naprężenia na pobocznicy pala na jego nośność i osiadanie. Analiza na podstawie liniowej teorii Boussinesqa.

EN

Analysis of the impact of the raft active zone thickness on the load distribution between the pile and raft and on the settlement of the combined piled-raft foundation (CPRF). The impact of the friction stress on the skin of the pile on its capacity and settlement. The analysis based on the linear Boussinesq theory.

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Intelligent personal assistant concept in context of fault analysis

Cichocki P., Pokojski J.

Computer Assisted Mechanics and Engineering Sciences

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2007

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Vol. 14, No. 4

591-600

EN

The authors of the paper took up Aoyama's concept of the integrated industrial processes intent analysis and linked it with the ideas of the designer's IPA (Intelligent Personal Assistant). In many cases it is not sufficient to analyze the engineer's intent depot when trying to explain the origin of a fault. Often computer models are built or real experiments are done with which the considered classes of problems can be analyzed better. The IPA concept was expanded for the process of building computer models and stands for the fault analysis.

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Innovative Realization of Quantitative Goals in BDI Agents via Partial Utility Functions

Przybylski M., Cichocki P.

Studia Informatica : systems and information technology

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2006

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Vol. 1(7)

105--116

EN

Agents play an important role in high level artificial intelligence in such areas as distributed decision support, robot control, computer games, etc. Currently, the most popular high-level agent architectures are based on the belief-desire-intention (BDI) model. BDI agents are usually specified in modal logic. This is efficient for defining event goals. However, defining quantitative goals can be very difficult in many popular formalisms. In this paper we propose a method for expressing quantitative goals by associating partial utility functions with agent’s goals. We propose a modified BDI agent architecture which is loosely based on fuzzy logic. In this architecture, approximation of partial derivatives of those functions enables us to use gradient based optimization algorithms in the intention reconsideration step to weight some action specializations. Using the proposed approach allows us to easily combine quantitative and event goals, and consider them all while planning. This paper also describes a simple language which can be used to elegantly describe generic action libraries in accordance to the proposed model.

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Zapis, składowanie i zarzadzanie wiedzą w biurze projektowym

Cichocki P., Gil M., Pokojski J.

Przegląd Mechaniczny

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1999

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nr 13

19-24

PL

W artykule przedstawiono pomysły autorów zwiazane z budową systemu zarządzania wiedzą projektową oraz opisy przykładowych implementacji.

EN

Formulation of general problems associated with modelling knowledge is followed by a discussuin of a linear, hierarchic and labyrinth model of designing. Designing a braking system of a mobile crane is an example of linear model, while designing a heating system in a single family house is an example of labyrinth model. For each example computer programs are decribed serving for the record, storage and management of knowledge.