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ELMAR, 2008. 50th International Symposium

Date 10-12 Sept. 2008

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Displaying Results 1 - 25 of 84
  • [Front matter]

    Page(s): c1 - c3
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    Freely Available from IEEE
  • [Copyright notice]

    Page(s): i
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    Freely Available from IEEE
  • ELMAR-2008 symposium Committees

    Page(s): ii - iv
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    Freely Available from IEEE
  • Elmar-2008 symposium international review Committee

    Page(s): v
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    Freely Available from IEEE
  • Croatian Society Electronics in Marine - ELMAR

    Page(s): vi
    Save to Project icon | Request Permissions | PDF file iconPDF (1743 KB)  
    Freely Available from IEEE
  • Welcome speech of the president of croatian society electronics in marine - ELMAR, Zadar

    Page(s): vii - viii
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    Freely Available from IEEE
  • Contents

    Page(s): ix - xxi
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    Freely Available from IEEE
  • From e-learning to m-learning through b-learning and s-learning

    Page(s): 341 - 344
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (172 KB)  

    Higher education has undergone a deep change since the Bologna Declaration and with the incorporation of new technologies, learning methods have been benefited by a large number of recent systems based on the combination of various models of education (blended learning). The present paper shows the evolution of e-learning towards other concepts such as b-learning and m-learning, giving examples of real projects inside our University to illustrate this process. Finally, the paper introduces a new learning concept (s-learning), that continues with the philosophy of re-usable educative objects to create encapsulated and re-usable educative services to be easily integrated in LMSs. The general lines of this new e-learning philosophy are described through several examples of advanced services that can be integrated into a LMS. View full abstract»

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  • An architecture for interactive target-oriented e-Learning systems

    Page(s): 345 - 348
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (272 KB)  

    In this paper, an architecture is proposed for the development of an e-Learning system based on Petri Nets and on a hybrid LDAP-SQL database. In this approach, e-Learning paths are initially tailored to the userpsilas aims and, during the learning process, are dynamically adapted to his needs. By means of an ad hoc user-system interface, each learner is allowed to specify his initial target and, if he decides to deepen some issues, is authorised to redefine such target over time. This process is guided by a ldquoPath Decision Modulerdquo based on Petri Nets, which checks the userpsilas learning level and consequently decides whether further issues can be faced or not. The underlying LDAP-SQL database benefits from the joint use of directory services and relational databases, used for the storage of learning material and dynamical paths respectively. Although the focus is on the e-Learning module, this architecture can be considered for a possible integration with m-Learning facilities. View full abstract»

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  • Albert, Al & Bart and the special relativity theory

    Page(s): 349 - 352
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1528 KB)  

    This paper expounds the development of a 3D multimedia product intended to explain elements of physics. It could be an innovative approach to m-learning, using cartoonspsila language to stimulate the youngest studentspsila attention. The aim is the exploration of cartoons as an alternative way of lesson. The short film has one leading character and three supporting characters. It was totally developed in Computer Graphics (CGI) using four virtual sets and nine lighting schemata. Albert, a nice scientist with flowing hair, explains the special relativity theory. He shows Bart, his bouncing assistant, that travels close to the speed of light and the effects of velocity. View full abstract»

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  • Web syndication in educational environment

    Page(s): 353 - 356
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (119 KB) |  | HTML iconHTML  

    The Web syndication - meaning really simple syndication (RSS ) - is a very important technology that specialists and educators would be well advised to harness. RSS and RSS feeds are relatively new to Internet users, being the most important technology to arrive on the internet since blogging. Because this technology provides us with a method of getting relevant and up to date information sent to us and for us to read in our own time, it saves a lot of time and helps getting the information we want quickly after it was published. The content comes to us instead of going to get it! This article discusses some RSS directions and ideas for teachers and instructors in order to get benefits of using RSS in education. View full abstract»

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  • Architectures of interconnection of network laboratories in distributed learning environment

    Page(s): 357 - 360
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (358 KB) |  | HTML iconHTML  

    For practical laboratory exercises of networking subjects it proved efficient to interconnect laboratories of multiple institutions to build large-scale virtual education environment, which may be accessible as part of common e-learning system. In the article we describe various approaches of creation of such distributed virtual topologies and experience with technical solutions tested in real e-learning education environment. Most of presented technologies are also beneficial to automatize topology interconnection process in standard networking laboratory to save teacherpsilas work and gain more time for real studentspsila practising. View full abstract»

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  • Brining together high-tech laboratories and e-Learning infrastructures

    Page(s): 361 - 364
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (175 KB) |  | HTML iconHTML  

    Most of todaypsilas collaborative systems are designed as a single, monolithic application. Although there are rare approaches to implement cross-functional architectures, these approaches lack in terms of taking high-tech laboratories into consideration. We understand high-tech laboratories as a kind of knowledge source and have identified an increasing demand for integrating these labs into university-wide e-learning infrastructures. A major challenge are proprietary and manufacturer-specific interfaces of laboratoriespsila equipment. Therefore this article presents a service-oriented architecture (SOA) for a thermal-shock laboratory to close the gap between knowledge creation and knowledge usage. In this respect digital libraries figure a key role as a place for archiving, structuring documents (e.g. test results), and making these available in an e-learning infrastructure. View full abstract»

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  • Vocational training and certification in ICT based on the e-learning

    Page(s): 365 - 367
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (678 KB) |  | HTML iconHTML  

    E-learning has brought a new approach into the learning. E-learning is mainly based on the self-learning and consultations with the lector. This article presents the set of new e-learning courses and certification exams oriented at the ICT areas. The description of the courses will be given and the arrangement of the courses will be described. The different kinds of questions for the certification exams will be presented too and the exam questions editor will discussed. View full abstract»

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  • Educational computer vision system for object detection and tracking

    Page(s): 369 - 372
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (317 KB) |  | HTML iconHTML  

    This article presents a laboratory computer vision system for vehicle detection and tracking. Vehicles are marked with colored circles, that are detected by the presented computer vision system. Detection of targets is performed by their shape using circular Hough transform. Once the locations of the targets are known, their colors are acquired. Tracking of the targets through video frames is then performed by color matching. View full abstract»

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  • A site-specific radar simulator for clutter modelling in VTS systems

    Page(s): 373 - 376
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (594 KB)  

    A general site-specific method is used to predict land/sea clutter strengths for low-angle monostatic radars involved in vessel traffic services (VTS). In order to characterise each specific environment and solve the electromagnetic problem, the simulation tool makes use of physical optics (PO), in particular the Kirchhoff approximation, and digital terrain models (DTM), and provides both the plan position indicator (PPI) clutter map and the A-scope power versus range or time profile. A data-acquisition system consisting of a commercial maritime radar and an A/D converter is used to validate the developed software by comparison between simulations and measurements in the same environments. Some specific results for a maritime scenario, both measurements and simulations, are discussed and finally, a statistical analysis of the simulated clutter is presented. View full abstract»

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  • Educational autopilot - a practical approach

    Page(s): 377 - 380
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (188 KB) |  | HTML iconHTML  

    The approach used for a computer-based system for collecting navigational data and developing an autopilot for the training ship used by the maritime schools of the Aland Islands in Finland is presented. Using the collected data, models for how the rudder angle responds to rudder command and how the ship responds to rudder angle are identified. Based on simulations of the identified models, an inner, nonlinear, controller for the rudder angle and an outer PID controller for the course are designed and evaluated in practice. The main contributions of the present study are the educational purpose and the practical approach: E.g., since the system is intended for educational use, a central aim is the keep all parts of the system translucent and comparable with existing navigational systems. Also, due to the limitations of the equipment of the training ship some practical challenges are tackled, e.g., the characteristics of the rudder steering necessitating nonlinear control. View full abstract»

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  • Estimation of tropospheric delay models compliance

    Page(s): 381 - 384
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (210 KB)  

    Tropospheric delay can be a significant source of error for satellite-based positioning systems, if it is not properly estimated. Two basic types of delay prediction models exist. The first use surface meteorological parameters to estimate the magnitude of the tropospheric delay, and the other global models use average and seasonal variation data. To verify the accuracy of tropospheric delay models, we compared representatives of both types within a period of 12 month, comprising all seasons. The Saastamoinen model known as one of the best performing prediction model was taken as a reference, and the global WAAS/EGNOS model was used to check how the estimates of the yearly averages of the meteorological parameters and their associated seasonal variations comply with the real-time surface parameters. View full abstract»

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  • GPS positioning performance in the wake of the Halloween 2003 geomagnetic storm

    Page(s): 385 - 388
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (159 KB) |  | HTML iconHTML  

    Severe space weather events are well known as the causes of considerable disruptions of the GPS positioning service. Manifested as geomagnetic and ionospheric storms, severe space weather affects the amount of the GPS ionospheric delay, which has been identified as the most important cause of GPS positioning error. Although the standard GPS positioning service offers the error compensation algorithm (called Klobuchar ionospheric model), studies showed it does not provide sufficient performance improvement, especially during severe space weather conditions. Space weather effects on GPS ionospheric delay have been studied in different parts of the world in order to establish local, regional and even global models of GPS ionospheric delay corrections. However, studies addressing the impact of severe space weather conditions on the actual GPS positioning performance are less abundant. Here we report the GPS positioning performance observed in Osijek, Croatia in the wake of severe space weather disruption and geomagnetic storm occurred on 29 and 30 October 2003, an event also known as the Halloween 2003 event. The archived single-frequency GPS pseudorange measurements taken at the reference GPS site at Osijek, Croatia were used in analysis of GPS positioning performance. Statistical properties (mean, median, standard deviation, kurtosis) of GPS northing, easting and height errors were calculated for every day in time interval 13 October 2003 - 3 November 2003 with reference to actual position of the Osijek reference station. Time series of GPS positioning errors statistical parameters were correlated with time series of space weather-related parameters (sunspot number and solar flux, as descriptor of solar activity, and planetary Ap index, as a descriptor of geomagnetic conditions). Results of the analysis show noticeable effects of height and north GPS positioning error components, while the east GPS positioning component remained almost unaffected. Further work will fo- - cus on investigation of correlation between statistical descriptors of the GPS positioning performance and space weather parameters. View full abstract»

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  • Simultaneous compensation and compression of surveillance camera in the ship’s monitoring system caused by engine vibrations

    Page(s): 389 - 392
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (147 KB) |  | HTML iconHTML  

    The paper proposes the system for monitoring and alarming engine crew aboard. It deals with detection of seawater in undesirable part of shipspsila system. Both hardware and software solutions are considered. The solution to many problems in such system is proposed, including algorithm for motion compensation and compression. The proposed system is not tested in the practice, because a real ship is necessary to implement it. However, advices from experience shippsilas engineers were taken into account. Mechanical problem is proposed to be solved by computer vision. View full abstract»

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  • Ship propulsion system health monitoring based on safety control functions

    Page(s): 393 - 396
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (162 KB) |  | HTML iconHTML  

    The ship propulsion system safety is not only a function of many environmental and operation factors, but also it is dynamic and complex. There are strong dependency relationships between the safety factors. The paper proposed a new approach that is applied to the evaluation of a safety function, a risk function and other safety characteristics of ship propulsion composed of a number of subsystems having an essential influence on the ship safety. First of all a basic safety structure of a multi-state system of the electric propulsion components with degrading safety states was defined. Further, a fuzzy analytical network process (FANP) for the considered system operation modeling was applied. This approach allows decision makers to evaluate risk factors using linguistic terms such as certain, very high, high, slightly high, medium, slightly low, low, very low or none rather than precise numerical values, allows them to express their opinions independently, and also provides algorithms to aggregate the assessments of multiple ship propulsion risk factors. A case study is investigated using the fuzzy logic package for Mathematica to illustrate its applications in risk assessment. It is shown that the fuzzy logic approach offers a flexible, practical and effective way of modeling risks assessment. View full abstract»

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  • Croatian ENC production process - a new approach

    Page(s): 397 - 400
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (532 KB) |  | HTML iconHTML  

    Hydrographic Institute of the Republic of Croatia (HHI) has been producing electronic navigational charts (ENC) since 2001. The process of ENC production proposed by the Italian company C-Map did not prove to conform to specific geographic characteristic of the Croatian part of the Adriatic Sea and HHIpsilas long tradition of chart production. It is the reason why there occurred the need for a redesign of the process of ENC production. This paper proposes new usage bands and compilation scales for each ENC usage band for the Croatian part of the Adriatic Sea. New classification of ENC cells is also proposed in the form of regular rectangular network, offering multiple advantages over the classification based on the HHI paper charts. View full abstract»

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  • Multipurpose marine Buoy

    Page(s): 401 - 405
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (328 KB) |  | HTML iconHTML  

    Solving the meteorological and oceanographic monitoring problems in frame of the actual ldquoJadran Projectrdquo the multipurpose marine buoy was developed to meat specific requirements in Adriatic Sea. The aluminum plastic coated buoy was designed to ensure stabile behavior at any waves high and wind speed that can occur in Adriatic aquatory. The 3 m high upper platform is provided for installation of the versatile atmospheric sensors, GPS and communication antennas. The main task of Power system department was to solve buoy powering. Specially designed solar panels are used to ensure enough electric power for continuous operation of buoy electronic equipment. There are three types of communication links provided on the buoy to meat any user requirement for data transfer between buoy and costal station. Specially designed user friendly data collection and visualization software is developed for the data presentation on the web. View full abstract»

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  • Measurement of vessel underwater noise signature

    Page(s): 407 - 410
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (151 KB) |  | HTML iconHTML  

    Radiated underwater noise from vessels is a key parameter for target detection and classification in the sea by means of sonar. In fishery, hydroacoustic systems are used for scientific and industrial purposes, to characterize the distribution of pelagic species, estimate stock abundance, observe fish behavior, locate fish shoals, control net position and estimate catch. Adverse fish reaction to ships and disturbances in operation of sensitive hydroacoustic instrumentation as a consequence of excessive ship noise is a well known fact and has been investigated internationally. Noise reduction measures have to be introduced in all stages of ship design and include preventing vibration transmission from rotating machines to the ship hull and reducing propeller generated noise. Successfulness of such measures can be verified only by ship sea trials at specialized noise measurement ranges. Low-noise hydrophones and modern digital instrumentation enable in-situ measurement of vessel hydroacoustic signatures in the whole frequency range of interest and investigation of noise sources. View full abstract»

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  • Current profile measurement using moored acoustic Doppler current profiler

    Page(s): 411 - 414
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (295 KB) |  | HTML iconHTML  

    Permanent monitoring of currents in the Adriatic coastal region is of great interest both scientifically and to the general public, because of their role in coastline sea life and their impact on economy and tourist activities. Moored ADCP is a convenient instrument for long time current studies. Itpsilas relatively cheep, but effective solution that could do the job of a full string of single point current meters. This paper describes some basic principles of operation, technical description and setup parameters of an ADCP. Deployment configurations together with example data of moored ADCP are also shown. View full abstract»

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