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Simple adaptive dynamical control of vehicles driven by omnidirectional wheels

Simple adaptive dynamical control of vehicles driven by omni...

引用

International Conference on Computational Cybernetics (ICCC)

作者： J.K. Tar I.J. Rudas I. Nagy K.R. Kozłowski J.A. Tenreiro Machado Telematics and Communications Informatics Knowledge Centre Hungary John von Neumann Faculty of Informatics Hungary Bánki Donát Faculty of Mechanical & Safety Engineering Budapest University슠of슠Technology슠and슠Economics Budapest Hungary Control and Systems Engineering Computing Science & Management Poznań University of Technology Poznan Poland Department of Electrotechnical Engineering Institute Engineering of Porto Porto Portugal

Precise control of Automatic Guided Vehicles (AGVs) navigating between the aisles of manufacturing systems by the use of local markers is an important task. On the basis of the geometric model of the workspace and the vehicles and that of the sensor uncertainties precise trajectories were recently generated along which the vehicle safely can move. In order to achieve precise trajectory tracking the effects of the system's dynamical uncertainties (modeling errors and possible external perturbations) have to be compensated. In the present paper a simple, fixed point transformations based adaptive control is proposed for this purpose. The proposed method is tested via simulation for a vehicle of triangular shape, driven by three omnidirectional wheels. The method is also able to monitor and evade the conditions that may lead to turning over the vehicle.

关键词： Programmable control Adaptive control Vehicle driving Wheels Automatic control Vehicles Vehicle safety Uncertainty Control systems Navigation

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Transport system architecture for on board wireless secured A/V surveillance and sensing

Transport system architecture for on board wireless secured ...

引用

International Conference on ITS Telecommunications (ITST)

作者： C. Lamy-Bergot S. Ambellouis L. Khoudour D. Sanz N. Malouch A. Hocquard J-L. Bruyelle L. Petit A. Cappa A. Barro E. Villalta G. Jeney K. Egedy EDS/SPM Department Thales Communications Colombes France Institut National de Recherche sur les Transports et leur Sécurité (INRETS) France Société Nationale des Chemins de fer Français (SNCF) France Université Pierre et Marie Curie France Alstom transport France Université Catholique de Louvain Belgium Barco Silex Belgium Telefonica Investigacion y Desarrollo Spain Arteixo Telecom Spain Ingenierìa y Economìa del Transporte Spain Budapest University슠of슠Technology슠and슠Economics Hungary E-GROUP Limited Hungary

This paper describes the system architecture set up by the consortium of the EUREKA CELTIC BOSS project for enhancing the security of passengers inside commuter trains. The functional approach, together with obtained technical improvements in the three domains of wireless communications, abnormal events detection and video compression and robustness enhancement are presented. The demonstrator set up in the project, which was installed in a real commuter train in commercial operation, is also reported as proof-of-concept.

关键词： Wireless sensor networks Communication system security Streaming media Cameras Event detection Video surveillance Automatic control Bandwidth Quality of service Mobile communication

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Intelligent End-To-End Resource Virtualization Using Service Oriented Architecture

Intelligent End-To-End Resource Virtualization Using Service...

引用

IEEE Globecom Workshops

作者： E. Onur E. Sfakianakis C. Papagianni G. Karagiannis T. Kontos I. Niemegeers I. P. Chochliouros S. Heemstra de Groot P. Sjodin M. Hidell T. Cinkler M. Maliosz D. I. Kaklamani J. Carapinha M. Belesioti E. Fytros Faculty of Electrical Engineering Mathematics and Computer Science Delft University of Technnology Netherlands Laboratories & New Technologies Division Research Programs Section Hellenic Telecommunications Organization S. A. Athens Greece School of Electrical and Computer Engineering National and Technical University of Athens Greece Department of Electrical Engineering Mathematics and Computer Science and CTIT University of Twente Enschede Netherlands Siemens IT Solutions and Services Athens Greece Twente Institute for Wireless and Mobile Communications Enschede Netherlands School of Information and Communication Technology Royal Institute of Technology Stockholm Sweden Department of Telecommunications and Media Informatics Budapest University슠of슠Technology슠and슠Economics Hungary Portugal Telecom Group PT Inovação S A Portugal

Service-oriented architecture can be considered as a philosophy or paradigm in organizing and utilizing services and capabilities that may be under the control of different ownership domains. Virtualization provides abstraction and isolation of lower level functionalities, enabling portability of higher level functions and sharing of physical resources. However, dynamics, environmental conditions and increasing complexity / heterogeneity of underlying resources call for adaptive resource handling. In this view an intelligent distributed architecture that enables dynamic user management and control on network-wide resource sharing by using the service oriented architecture concept is presented. Additionally, the proposed architecture supports trading of resources that will enable the transformation of traditional business models.

关键词： Resource virtualization Service oriented architecture Resource management Computer networks Grid computing Cloud computing Mathematics Computer science Organizing Hardware

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Heating effects of short circuit current impulses on contacts and conductors

Heating effects of short circuit current impulses on contact...

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IEEE PES Transmission and Distribution Conference and Exposition

作者： Laszlo Koller Balazs Novak Gyorgy Tevan Budapest University슠of슠Technology슠and슠Economics Hungary

Summary form only given. An analytical description combined with finite element calculations of the current displacement caused by short-circuit current impulses in one- and two dimensional conductor models is presented. It is shown that in many cases the Joule-integral used in the technical practice gives a false representation of the thermal stress in the conductors and contacts. A simplified method is given for determining the degree of current displacement caused by different current impulses, hence the non-uniformity of the losses and the heating within the conductors.

关键词： Heating Short circuit currents Conductors Thermal stresses Cause effect analysis Finite element methods Thermal conductivity

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Optimal Lot Streaming for FMS Scheduling of Flow-Shop Systems

Optimal Lot Streaming for FMS Scheduling of Flow-Shop System...

引用

IEEE International Conference on Intelligent Engineering Systems (INES)

作者： Ezedeen Kodeekha Janos Somlo Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

This paper deals with the scheduling problem of flexible manufacturing systems (FMS). The new contribution of the present paper is applying a brute force method (BFM) and joinable schedule approach (JSA) to FMS scheduling problems for multi-machine, multi-job flow shop systems (FSS). the purpose is to realize the minimum of maximum production time (makespan) close to global minimum in order to obtain optimal lot streaming (LS) thus improving system utilization. Independent sequence setup time is considered. A comparison study is performed. Numerical example is given. New results are presented and a general mathematical model of optimal LS for FMS scheduling problems of FSS is developed.

关键词： Flexible manufacturing systems Job shop scheduling Frequency selective surfaces Processor scheduling Mathematical model Computer integrated manufacturing Production systems Optimized production technology Artificial intelligence Fuzzy logic

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A Synchronizing Technique for Syntactic Model-Code Round-Trip Engineering

A Synchronizing Technique for Syntactic Model-Code Round-Tri...

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International Conference and Workshop on Engineering of Computer-Based Systems

作者： László Angyal László Lengyel Hassan Charaf Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

The introduction of UML class diagrams has not raised the abstraction level of development to the extent that was intended: class diagrams are only the visual representations of source class skeletons implemented in a programming language. To improve the productivity, domain-specific languages are applied, which cover a narrow domain, and their high abstraction makes use of the domain experts easier. The simultaneous evolution of the source code and the software models causes the loss of synchronization. Round-tripping the domain-specific models is not supported by model-driven development tools, because the abstraction gap between the models and the generated code prevents the use of general approaches. However, developers should have the opportunity of choosing between the artifacts that are more efficient for applying the modifications. This paper introduces how different tools achieve the preservation of manually written code while the model is evolving. In contrast, we present our approach that allows the customization of the generated code. The abstraction gap is closed by performing model transformations and an incremental merge.

关键词： Unified modeling language Skeleton Productivity Domain specific languages Metamodeling Microwave integrated circuits Conferences Computer languages Merging Proposals

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Bridging Distances by Giving Actual Content in Flexible Teaching Programs

Bridging Distances by Giving Actual Content in Flexible Teac...

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International Conference on Computational Cybernetics (ICCC)

作者： J. Gati Gy. Kartyas Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

Advanced information technology gives a new chance for new efficient forms of distance teaching and learning. In engineering, group work and computer descriptions are recent advancements in Internet based environments. Application of ideas and methods from computer aided engineering in distance teaching and learning is a new chance for fulfilling the old demand of integrated higher engineering education and industrial engineering environments. In this paper, flexible functionality of a new development in this area is analyzed. Following this, a student requests driven solution is discussed. Next structural and implementation issues are concluded.

关键词： Education Computer aided instruction Internet Application software Electronic learning Power system management Information technology Educational programs Distance learning Industrial engineering

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A new method for measuring am compression and AM-to-PM conversion of microwave amplifiers

A new method for measuring am compression and AM-to-PM conve...

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International Conference on Microwaves, Radar and Wireless Communications

作者： Tibor Berceli Budapest University슠of슠Technology슠and슠Economics Hungary

The measurement of the nonlinearity characteristics is usually cumbersome. In this paper a simple method is presented for the measurement of some nonlinearity characteristics, i.e. for the AM compression and AM-to-PM conversion. These methods offer easy measurement processes that are widely applicable and do not need special instrumentation. They have another important advantage: the dynamic behavior of the AM compression and AM-to-PM conversion characteristics can also be obtained in a simple way. Using these measurement methods the AM compression and AM-to-PM conversion characteristics of a microwave amplifier have been tested.

关键词： Amplitude modulation Microwave measurements Microwave amplifiers Microwave theory and techniques Frequency modulation Modulation Semiconductor device measurement

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On the practical approach to functions and structure of virtual university programs

On the practical approach to functions and structure of virt...

引用

International Symposium on Intelligent Systems and Informatics (SISY)

作者： J. Gati Gy. Kartyas Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

By the development of communication in computer systems, development and application of Internet mediated teaching systems in the communication intensive higher education one of the main concerns in applied informatics. As these applications became more complex and by increased demand for better utilization of computer technology, direction of development changed to replace the conventional documentation style systems by more advanced model based systems. The authors made an analysis on one of these attempts from the point of view application of model based virtual higher education programs in the practice of engineering education. In this paper, representative issues and methods are introduced and discussed including versatile course based on student profile, definition and constraining of courses, topics and procedures, and extension to industrial modeling system.

关键词： Application software Electronic learning Power system management Computer science education Internet Educational programs Education courses Resource management Informatics Documentation

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Selective laser soldering on flexible boards using through foil heating

Selective laser soldering on flexible boards using through f...

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International Spring Seminar on Electronics technology

作者： Zsolt Baranyay Zsolt Illyefalvi-Vitez Balint Balogh Department of Electronics Technology Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

In our selective laser soldering experiments, we soldered surface mount (SM) chip resistors onto flexible substrates. Taking advantage of the transparency of the substrates in the red and the infrared range, we applied an interesting and unique technique by heating the solder pads exposing them through the substrate. Our previous measurements showed that the polyimide (PI) and polyester (PET) substrates absorbed less than 5% of the 1064 nm wavelength laser light, while polyethylene-naphtalate (PEN) absorbed about 30%. The laser energy which was let through was enough to melt the two lead-free alloys and formed a perfect meniscus at the solder joint.

关键词： Soldering Infrared heating Surface emitting lasers Samarium Resistors Semiconductor device measurement Wavelength measurement Polyimides Positron emission tomography Environmentally friendly manufacturing techniques

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