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Laser soldering of small pitch BGAs on Plexiglas substrate PCBs

Laser soldering of small pitch BGAs on Plexiglas substrate P...

引用

International Spring Seminar on Electronics technology

作者： Radu Bunea Balint Balogh Reka Batorfi Zsolt Illyefalvi-Vitez Paul Svasta Robert Kovacs Csaba Nagynemedi Daniel Rigler Center of Technological Electronics and Interconnection Techniques UPB-CETTI Politehnica University of Bucharest Romania Department of Electronics Technology (BME-ETT) Budapest University슠of슠Technology슠and슠Economics Hungary

The paper presents the results of the study and the procedure of soldering 200 mum pitch BGAs on circuits on PMMA (poly-methyl-methacrylate or Plexiglas) substrate, starting from the paste deposition process, fine placement of the BGAs and finally soldering. The novelty in this research is that it had to face two restrictions. The combination of PMMA substrate, transparent to laser, and SnBi, ecologic solder paste, which required a low and very well-controlled soldering temperature, and the small size of the BGAs which needed a punctual soldering. These particularities led the team to use laser for soldering, due to the possibility of highly accurate energy calculation and very small size of the focused beam.

关键词： Soldering Printing Paper technology Apertures Laser beams Electronic equipment testing Power generation economics Temperature Assembly Power lasers

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Ubiquitous haptic interface in intelligent space

Ubiquitous haptic interface in intelligent space

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SICE Annual Conference

作者： H. Hashimoto P.T. Szemes Institute of Industrial Science University of Tokyo Meguro Tokyo Japan PRESTO Japan Science and Technology Corporation Japan Integrated Intelligent Systems JapaneseHungarian Joint Laboratory Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

In this paper, the intelligent space concept is applied for helping disabled or blind persons in crowded environments such as train stations, or airports. The main contribution of this paper is a general mathematical (fuzzy-neuro) description of obstacle avoidance method (walking habit) of moving objects (human beings) in a limited area scanned by the intelligent space. A mobile robot with extended functions is introduced as a mobile haptic interface, which is assisted by the intelligent space. The mobile haptic interface can guide and protect a blind person in a crowded environment with the help of the intelligent space. The intelligent space learns the obstacle avoidance method (walking habit) of dynamic objects (human beings) by tracing their movements and helps to the blind person to avoid the collision. The prototype of the mobile haptic interface and simulations of some basic types of obstacle avoidance method (walking habit) are presented.

关键词： Haptic interfaces Intelligent sensors Intelligent robots Intelligent actuators Intelligent agent Humans Space technology Mobile robots Machine intelligence Computational intelligence

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Information Enhancement Method for Image Retrieval and Object Recognition

Information Enhancement Method for Image Retrieval and Objec...

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International Symposium on Computational Intelligence and Intelligent Informatics, ISCIII

作者： A. Rovid T. Hashimoto A.R. Varkonyi-Koczy Y. Shimodaira Department of Electrical and Electronics Engineering Shizuoka University Japan Department of Measurement and Information Systems Integrated Intelligent Systems Japanese-Hungarian Laboratory Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

Recently, the importance of information enhancement methods in digital image processing has increased significantly. A large amount of research has been focused on information retrieval and image understanding. Typical examples are searching for similar objects/images in large databases and understanding the objects in images. The main point of these tasks is to extract the most characteristic features of the objects in the images, like edges, corners, characteristic textures, etc. Another very important aspect can be the separation of the "significant" and "unimportant" parts of these features, i.e. the enhancement of those features which carry primary information and to filter out the part which represents information of minor importance. By this, the complexity of the searching and/or interpreting algorithms can be decreased while the performance increased. This paper describes a new edge processing method which is able to extract the "primary", i.e. those edges which can advantageously be used in sketch based image retrieval algorithms.

关键词： Information retrieval Image retrieval Object recognition Data mining Digital images Image databases Spatial databases Filters Image edge detection Image processing

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An exact solution for the infinite horizon LQ optimal output tracking problem

An exact solution for the infinite horizon LQ optimal output...

引用

IEEE Conference on Control technology and Applications (CCTA)

作者： Peter Bauer Balazs Kulcsar Jozsef Bokor Delft Center for System and Control Faculty 3ME Technical University Delft Delft Netherlands Faculty of Transportation Engineering Department of Control and Transport Automation Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

The paper proposes a new, discrete time LQ optimal controller synthesis for output tracking over an infinite horizon. The resulted controller consists of a state feedback and a feedforward term. The solution requires a one step ahead prediction of the reference signal. For a smooth enough reference signal this can be replaced with extrapolation. Here, the properties for constant reference signals are examined, time varying references will be covered with another article. The method guarantees asymptotical stability and zero steady state tracking error. The elaborated techniques satisfy the separation principle for an arbitrary deterministic or stochastic state estimator. The reference tracking problem for a quadrotor helicopter is solved by the method. The trajectory tracking control is successfully applied both with reference signal preview and extrapolation (considering time varying references also).

关键词： Control systems USA Councils Conferences

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The nanoelectronics training roadmap of Euro Training

The nanoelectronics training roadmap of Euro Training

引用

EAEEIE Annual Conference,

作者： Zsolt Illyefalvi-Vitez Herve Fanet Department of Electronics Technology (ETT) Budapest University슠of슠Technology슠and슠Economics Budapest Hungary Commissariat à lÉnergie Atomique (CEA) Laboratoire délectronique et de technologie de l''information Grenoble France

The ultimate goal of the EuroTraining Project is to enhance European industrial competitiveness in the global marketplace mainly by providing easy access to European training courses and by stimulating the development of new courses in the field of micro- and nanoelectronics. Training and university education roadmaps are being developed to support these activities. The nanoelectronics training roadmap will reach conclusions from the analyses of the needs of industry with a special focus on SMEs; of EU's new Member States; and of the broader public.

关键词： Nanoelectronics Industrial training Nanotechnology Materials science and technology Nanoscale devices Consumer electronics Quantum computing Material storage Industrial electronics Electronics industry

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Extending mobile BitTorrent environment with network coding

Extending mobile BitTorrent environment with network coding

引用

Consumer Communications and Networking Conference, CCNC IEEE

作者： Péter Ekler Tamás Lukovszki Jukka K. Nurminen Department of Automation and Applied Informatics Budapest University슠of슠Technology슠and슠Economics Hungary Faculity of Informatics Eötvös Lonránd University Hungary Nokia Research Center

Peer-to-peer based content sharing is considered as one of the most efficient and popular content distribution solution nowadays. However in such network it is common that parts of the content is not distributed to several peers yet, thus during the download we have to wait a lot for that rare pieces. In addition to that it is also possible that we will not be able to download the rare pieces because the original seeder has already left the network. In this paper we investigate how to increase download efficiency in BitTorrent, in case of rare pieces by using network coding methods. In mobile networks the peer connections are not so reliable, because the phones as peers can leave the network any time e.g. if the network coverage is weak. Bringing BitTorrent technology to mobile phones has already been demonstrated with the implementation of SymTorrent and MobTorrent. In this research we investigate how to extend these implementations with network coding, to increase efficiency in case of rare pieces.

关键词： Conferences

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Reversed dispersion slope photonic bandgap fibers and femtosecond pulse propagation

Reversed dispersion slope photonic bandgap fibers and femtos...

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Optical Fiber Communication (OFC) Conference

作者： Z. Varallyay K. Saitoh A. Szabo K. Kakihara M. Koshiba R. Szipocs Furukawa Electric Institute of Technology Limited Budapest Hungary Graduate School of Information Science and Technology Hokkaido University Sapporo Japan Budapest University슠of슠Technology슠and슠Economics Hungary Research Institute of Solid State Physics and Optics Budapest Hungary

Reversed dispersion slope PBG fibers are presented around one micron by the introduction of partial reflector layer around the core resulting in a strongly wavelength dependent nonlinear phase shift on the propagating... 详细信息

关键词： Photonic bandgap fibers Optical fiber devices Ultrafast optics Optical pulse compression Reflectivity Fiber nonlinear optics Nonlinear optics Optical propagation Photonic band gap Optical fiber theory

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Different Polytopic Decomposition of the Model of Heavy Vehicles by TP model transformation

Different Polytopic Decomposition of the Model of Heavy Vehi...

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IEEE International Conference on Intelligent Engineering Systems (INES)

作者： Zoltan Petres Peter Baranyi Peter Gaspar Peter Varlaki Pal Michelberger Systems and Control Lab Computer and Automations Research Institute Hungarian Academy of Sciences (ATOMKI) Hungary Department of Vehicle and Light Weight Structures Analysis Budapest University슠of슠Technology슠and슠Economics Hungary

This paper is concerned with the generation of various different polytopic representation of the vehicle model for LMI based control design. In case of polytopic models conditions like controllability, observability of the systems and the feasibility of the linear matrix inequalities based analysis and design strongly depends on the weighting of the LTI vertex components of the polytopic model. TP model transformation is performed on the LPV model of the heavy vehicle, the HOSVD based canonical and other convex polytopic representations are presented and in a controller design problem the various representations are investigated.

关键词： Automatic control Control design Vehicle dynamics Linear matrix inequalities Vectors Strontium Control system synthesis Lighting control Automation Electronic mail

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On the use of proper weighting in reference tracking optimal control with guaranteed DARE solvability

On the use of proper weighting in reference tracking optimal...

引用

Mediterranean Conference on Control and Automation (MED)

作者： Peter Bauer Balazs Kulcsar Jozsef Bokor Transportation Engineering Department of Control and Transport Automation Budapest University슠of슠Technology슠and슠Economics Budapest Hungary Delft Center of System and Control Faculty ME Technical University of Delft Delft Netherlands

The paper suggests to apply a proper output weight to achieve guaranteed discrete algebraic Riccati equation (DARE) solvability of the LQ optimal control problem with output tracking. Usually a positive semi definite state weighting matrix (Q) is mentioned to be sufficient for solvable DARE. However, the literature also proposes more general rank conditions. The paper shows a sufficient condition to guarantee DARE solvability under output tracking problems, by the appropriate selection of a Q > 0 matrix. At output tracking quadratic problems Q results as a sparse matrix. Therefore, a special attention has to be carried on the output weighting strategy guaranteing DARE solvability for a class of linear and mostly integrating systems. Injecting additional weights, the closed system performance can be increased. The importance of the proper weighting strategy is illustrated with a numerical example where it has been pointed out that inappropriate weights leads to infeasible DARE.

关键词： Automation Conferences

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Implementation of 3D Monte Carlo PET reconstruction algorithm on GPU

Implementation of 3D Monte Carlo PET reconstruction algorith...

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IEEE Symposium on Nuclear Science (NSS/MIC)

作者： A. Wirth Á. Cserkaszky B. Kári D. Légrády S. Fehér Sz. Czifrus B. Domonkos Department of Diagnostic Radiology and Oncotherapy Semmelweis University Hungary Institute of Nuclear Techniques Budapest University슠of슠Technology슠and슠Economics Hungary Mediso Medical Imaging Systems Mediso Limited Hungary

The presentation summarizes our achieved results within the framework of the cross-institutional research project called TeraTomo. The aim of the latter is to create a high-speed algorithm optimized on graphics processors (GPU) providing more accurate PET reconstructions by taking advantage from CT data. The current paper discusses a hit-and-miss Monte Carlo approach as an "on-the-fly" forward projector of an ML-EM algorithm.

关键词： Monte Carlo methods Positron emission tomography Reconstruction algorithms Yarn Sampling methods Computed tomography Graphics Image reconstruction Back Computer architecture

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