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Comparision of Multi-Carrier Techniques in Seven-Level Asymmetric Cascade Multilevel Inverter

Comparision of Multi-Carrier Techniques in Seven-Level Asymm...

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International Conference on Power Engineering, Energy and Electrical Drives

作者： Ilhami COLAK Ersan KABALCI Gokhan KEVEN Faculty of Technology Department of Electric & Electronic Engineering Gazi University Ankara Turkey Faculty of Engineering & Architecture Dep. of Electrical & Electronic Eng. Nevsehir University Nevsehir Turkey Vocational College of Haci Bekta? Veli Dep. of Computer Programming Nevsehir University Nevsehir Turkey

ISBN: (纸本)9781467363914

The multilevel inverters (MLIs) are classified into three topologies such as Diode Clamped, Flying Capacitor and Cascade Multilevel Inverter (CMLI). CMLI topologies include two kind of structure that is named symmetric and asymmetric topologies. Asymmetric Cascade MLI (ACMLI) topologies consist of unequal DC sources. Many modulation techniques have been used in ACMLI topology such as Multi-Carrier PWM (MC-PWM), Space Vector PWM and Selective Harmonic PWM. The MC-PWM technique is achieved by four different types. In this study, MC-PWM techniques which are named Phase Disposition PWM, Phase Opposition Disposition PWM, Alternate Phase Opposition Disposition PWM and Phase Shifted PWM have been compared. It is uncovered that Phase Opposition Disposition PWM technique is more convenient in terms of Total Harmonic Distortion of output voltage and current signals and in terms of the quality of power factor in ACMLI which is performed in this study.

关键词： asymmetric cascade multilevel inverter multi carrier PWM THD frequency index power factor

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Improving communication in PGAS environments: Static and dynamic coalescing in UPC 13

Improving communication in PGAS environments: Static and dyn...

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27th ACM International Conference on Supercomputing, ICS 2013

作者： Alvanos, Michail Farreras, Montse Tiotto, Ettore Amaral, José Nelson Martorell, Xavier Programming Models Barcelona Supercomputer Center Barcelona Spain Department of Computer Architecture Universitat Politecnica de Catalunya Cr. Jordi Girona 1-3 08034 Barcelona Spain Static Compilation Technology IBM Toronto Laboratory Toronto ON Canada Dep. of Computing Science University of Alberta Edmonton AB Canada Barcelona Supercomputing Center Cr. Jordi Girona 29 08034 Barcelona Spain IBM Canada CAS Research Markham ON Canada

ISBN: (纸本)9781450321303

The goal of Partitioned Global Address Space (PGAS) languages is to improve programmer productivity in large scale parallel machines. However, PGAS programs may have many fine-grained shared accesses that lead to performance degradation. Manual code transformations or compiler optimizations are required to improve the performance of programs with fine-grained accesses. The downside of manual code transformations is the increased program complexity that hinders programmer productivity. On the other hand, most compiler optimizations of fine-grain accesses require knowledge of physical data mapping and the use of parallel loop constructs. This paper presents an optimization for the Unified Parallel C language that combines compile time (static) and runtime (dynamic) coalescing of shared data, without the knowledge of physical data mapping. Larger messages increase the network efficiency and static coalescing decreases the overhead of library calls. The performance evaluation uses two microbenchmarks and three benchmarks to obtain scaling and absolute performance numbers on up to 32768 cores of a Power 775 machine. Our results show that the compiler transformation results in speedups from 1.15X up to 21X compared with the baseline versions and that they achieve up to 63% the performance of the MPI versions. © 2013 ACM.

关键词： Dynamics

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Swarm art with KANTS: Using an ant clustering algorithm for generating abstract paintings

Swarm art with KANTS: Using an ant clustering algorithm for ...

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1st International Conference on Complex Systems, ICCS 2012

作者： Fernandes, Carlos M. Mora, Antonio Merelo, Juan Julian Rosa, Agostinho C. Dep. of Computer Architecture and Technology University of Granada Granada Spain Technical University of Lisbon Lisbon Portugal

ISBN: (纸本)9781467347662

This paper describes an ant-based clustering algorithms and suggests its application as a swarm art conceptual tool. The algorithm, called KANTS, consists on a set of equations that model the local behavior of simple units (ants) that represent data samples. When moving on a heterogeneous 2-dimensional lattice of vectors, global behavior emerges from the local interaction between the ants, which self-organize into clusters. In this paper, KANTS is used outside a purely scientific framework. The algorithm is applied to two different types of data (sleep Electroencephalogram signals and colored photographs) for generating 2-dimensional abstract representations of those sets of data. We call the images pherogenic drawings, since they are a visual representation of the algorithm's pheromone maps. The method is contextualized within the swarm art field as well as within the authors' previous works on swarm art. © 2012 IEEE.

关键词： Clustering algorithms

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A new adaptive fuzzy control policy against conventional methods. Statistical analysis of real time control performance

A new adaptive fuzzy control policy against conventional met...

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World Conference on Complex Systems (WCCS)

作者： Rafik Lasri Ignacio Rojas Héctor Pomares Olga Valenzuela Dep. Computer Architecture & Computer Technology Univ. Of Granada SPAIN Dep. Applied Mathematics Univ. Of Granada SPAIN

During a real time control process, a set of controllers that use different control policies have been used to control the temperature of a simulated room during 200 minutes under the same conditions. All the realized simulations have been repeated five times with two different sets of set points. A quantitative comparison between the performance of the conventional controllers and the new Adaptive and Self-Organizing Fuzzy Controller proposed in this work will be performed. This latter can adapt and self-organize their internal parameters in real time using just a few qualitative information about the plant (the monotonicity sign and the delay time) and without allocate a rule base. Using all results of the performed simulations as a set of sampling for the statistical tool ANOVA (Analysis Of Variance), we have been able to emphasize the extrapolability of the obtained results (the committed error and the power consumption) and illustrate the great contribution that brings the new Adaptive and Self-Organizing Fuzzy Control policy proposed in this paper.

关键词： Process control Adaptation models Analysis of variance Real-time systems Mathematical model Fuzzy logic Temperature control

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A novel policy to reduce the electrical cost of a real time control process using an on-line Adaptive Fuzzy Logic Controller

A novel policy to reduce the electrical cost of a real time ...

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IEEE International Conference on Multimedia Computing and Systems (ICMCS)

作者： Rafik Lasri Ignacio Rojas Héctor Pomares Dep. Computer Architecture & Computer Technology E.T.S. Ing. Informática & Telecomunicación - Univ. of Granada Periodista Daniel Saucedo Aranda GRANADA (SPAIN)

ISBN: (纸本)9781467315180

With a very limited knowledge of the plant (delay and monotonicity sign) and without any kind of off-line pre-training, a Self-Organizing and Adaptive Fuzzy Logic Controller is developed to reduce the energy consumption during a control process. Our on-line adaptive controller is able to modify and to adapt the rule base of the system by learning from the real behavior of the plant. A comparison results - based on the real electrical consumption - between several conventional control algorithms and the adaptive one is presented, this latter has been able to provide a quite interesting output signal that optimizes the energy consumption without losing the control performance.

关键词： Process control Temperature control Fuzzy logic Intelligent control System-on-a-chip Tuning

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Kinect=IMU? Learning MIMO Signal Mappings to Automatically Translate Activity Recognition Systems across Sensor Modalities

Kinect=IMU? Learning MIMO Signal Mappings to Automatically T...

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International Symposium on Wearable computers

作者： Oresti Banos Alberto Calatroni Miguel Damas Hector Pomares Ignacio Rojas Hesam Sagha Jose del R. Mill´n Gerhard Troster Ricardo Chavarriaga Daniel Roggen ETH Wearable Computing Laboratory Zurich Switzerland CNBI Center for Neuroprosthetics École Polytechnique Fédérale de Lausanne Switzerland CNBI Center for Neuroprosthetics Switzerland Dep. of Computer Architecture and Computer Technology University of Granada Spain

We propose a method to automatically translate a preexisting activity recognition system, devised for a source sensor domain S, so that it can operate on a newly discovered target sensor domain T, possibly of different modality. First, we use MIMO system identification techniques to obtain a function that maps the signals of S to T. This mapping is then used to translate the recognition system across the sensor domains. We demonstrate the approach in a 5-class gesture recognition problem translating between a vision-based skeleton tracking system (Kinect), and inertial measurement units (IMUs). An adequate mapping can be learned in as few as a single gesture (3 seconds) in this scenario. The accuracy after Kinect → IMU or IMU → Kinect translation is 4% below the baseline for the same limb. Translating across modalities and also to an adjacent limb yields an accuracy 8% below baseline. We discuss the sources of errors and means for improvement. The approach is indep.ndent of the sensor modalities. It supports multimodal activity recognition and more flexible real-world activity recognition system dep.oyments.

关键词： Acceleration MIMO Target recognition Accuracy Joints Smart phones Position measurement

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A Data Mining Approach Based on a Local-Global Fuzzy Modelling for Prediction of Color Change after Tooth Bleaching Using Vita Classical Shades

A Data Mining Approach Based on a Local-Global Fuzzy Modelli...

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International Conference on Intelligent Systems Design and Applications (ISDA)

作者： L.J. Herrera M.M. Pérez J. Santana R. Pulgar J. González H. Pomares I. Rojas Dep. Computer Architecture and Technology University of Granada Spain Dep. Optics University of Granada Spain Dep. Odontology University of Granada Spain Dep. Computer Architecture and Technology University of Granada

Tooth bleaching is receiving an increasing interest by patients and dentists since it is a relatively non-invasive approach for whitening and lightening teeth. Instrument designed for tooth color measurements and visual assessment with commercial shade guides are nowadays used to evaluate the tooth color. However, the degree of color change after tooth bleaching varied substantially among studies and currently, there are no objective guidelines to predict the effectiveness of a tooth bleaching treatment. Fuzzy logic is a well known paradigm for data modelling; their main advantage is their ability to provide an interpretable set of rules that can be later used by the scientists. However these models have the problem that the global approximation optimization can lead to a deficient rule local modelling. This work proposes a modified fuzzy model that performs a simultaneous global and local modelling. This property is reached thanks to a special partitioning of the input space in the fuzzy system. The proposed approach is used to approximate a set of color measurements taken after a bleaching treatment using the pre-bleaching measurements. The system uses as rule antecedents the colorimetric values of the VITA commercial shade guide. The expected post-bleaching colorimetric values are immediately obtained from the local models (rules) of the system thanks to the proposed modified fuzzy model. Additionally, these post-bleaching CIELAB coordinate values have been associated with VITA shades through the evaluation of their respective membership functions, approximating which VITA shades are expected after the treatment for each pre-bleaching VITA shade.

关键词： Data mining Predictive models Teeth Bleaching Fuzzy systems Instruments Dentistry Guidelines Fuzzy logic Medical treatment

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Query relaxing based on ontology and users' behavior in service discovery

Query relaxing based on ontology and users' behavior in serv...

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4th International Conference on Fuzzy Systems and Knowledge Discovery, FSKD 2007

作者： Li, Lian Jun, Ma JingSheng, Lei Ling, Song DongMei, Zhang School of Computer Science and Technology Shandong University China College of Information Science and Technology Hainan University China Dep. of Computer Science and Technology Shandong Architecture University Jinan China

ISBN: (纸本)0769528740

Relaxing a failing query to the successful one with smallest semantic gap is the goal in Web service discovery. A schema for query relaxing is proposed based on both service ontologies and users' behavior, where the conceptual hierarchies and the conceptual distribution density of the ontologiese are taken into account during query relaxing and the conceptual hierarchies of a ontology are enlarged based on users' behavior. A failing query can be relaxed to a successful one based on service ontologies and users' behavior with progressive processing. © 2007 IEEE.

关键词： Query processing

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StorySurfer: A playful book browsing installation for children's libraries 07

StorySurfer: A playful book browsing installation for childr...

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6th international Conference on Interaction Design And Children, IDC 2007

作者： Eriksson, Eva Lykke-Olesen, Andreas IDC - Interaction Design Collegium Dep. of Computer Science and Engineering Chalmers University of Technology SE-41296 Gothenburg Sweden Department of Design Aarhus School of Architecture DK-8000 Aarhus C Denmark

ISBN: (纸本)9781595937476

In this paper, we present a large-scale interactive book browsing installation for children's libraries called StorySurfer. The StorySurfer prototype is developed within the Interactive Children's Library project, which includes interests from within design, research, industry, and libraries. The objective of the project is to give room for and encourage the physical activities of children, while pursuing to connect these with the basic digital and analogue services of the library e.g. borrowing and handing in books, searching for information, and providing access to a rich variety of media. Copyright 2007 ACM.

关键词： Digital libraries

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Evaluation of Interconnection Networks Using Full-System Simulators: Lessons Learned

Evaluation of Interconnection Networks Using Full-System Sim...

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Annual Symposium on Simulation

作者： Javier Navaridas Fco. Javier Ridruejo Jose Miguel-Alonso Dep. of Computer Architecture and Technology University of Basque Country (UPV-EHU) Donostia San Sebastian Spain

In this paper we show the difficulties encountered when performing full system simulation of a distributed memory parallel system. To illustrate the problem, we have chosen a workbench that evaluates the impact on application performance of some simple congestion-control mechanism that can be implemented in the interconnection network. Applications of choice are some of those included in the NAS parallel benchmarks. Running a full-system, execution-driven simulation that combines Simics with an interconnection network simulator, we observe some unexpected, negative interactions of overlapping congestion control techniques implemented at the network level and at the host level. Each MPI implementation uses a different protocol stack, and some of them work without TCP. We compare and contrast results obtained with MPICH, LA-MPI and LAM

关键词： Multiprocessor interconnection networks Storage area networks Economic indicators

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