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A FCA-based approach for enriching users' knowledge base

A FCA-based approach for enriching users' knowledge base

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2011 IEEE International Conference on Granular Computing, GrC 2011

作者： Kim, Eung-Hee Kim, Hong-Gee Hwang, Suk-Hyung Biomedical Knowledge Engineering Lab. Seoul National University Seoul Korea Republic of Dep. of Computer Science and Engineering Sunmoon University Asan-si Korea Republic of

ISBN: (纸本)9781457703713

Despite of the various benefits obtainable from Formal Concept Analysis (FCA) in knowledge base construction, FCA-based approaches are not enough to help an expert enrich his knowledge. This is because they provide only the clusters constructed with user-defined knowledge and super-sub relation between the clusters. In this paper, we propose an approach that provides a user with a guideline by suggesting undiscovered knowledge in the form of predicates. This approach firstly generates a set of candidate predicates by analyzing a pre-defined predicate by users. Second, it discards unqualified ones from the set of candidate predicates using a filtering method dealing with two criteria, uniqueness and support. The qualified candidate predicates are suggested, and selected by the user, and finally, his knowledge is enriched by merging the selected predicates with pre-defined ones. © 2011 IEEE.

关键词： Formal concept analysis

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On the use of perceptual properties for melody estimation

On the use of perceptual properties for melody estimation

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14th International Conference on Digital Audio Effects, DAFx 2011

作者： Liao, Wei-Hsiang Su, Alvin W.Y. Yeh, Chunghsin Roebel, Axel Dep. of Computer Science and Information Engineering National Cheng-Kung University Tainan Taiwan Analysis/Synthesis Team IRCAM/CNRS STMS Paris France

ISBN: (纸本)9782954035109

This paper is about the use of perceptual principles for melody estimation. The melody stream is understood as generated by the most dominant source. Since the source with the strongest energy may not be perceptually the most dominant one, it is proposed to study the perceptual properties for melody estimation: loudness, masking effect and timbre similarity. The related criteria are integrated into a melody estimation system and their respective contributions are evaluated. The effectiveness of these perceptual criteria is confirmed by the evaluation results using more than one hundred excerpts of music recordings.

关键词： Audio recordings

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Phasor measurement unit and power conditioner applied to load transferring to reduce current magnitude during feeder parallel operation period

Phasor measurement unit and power conditioner applied to loa...

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作者： Wang, Shu-Chen Wu, Chi-Jui Tsai, Hsin-Chun Department of Computer and Communication Engineering Taipei College of Maritime Technology Taipei Taiwan Dep. of Electrical Engineering National Taiwan University of Science and Technology Taipei Taiwan

ISBN: (纸本)9789604742820

The requirement of high quality electric power supply from utility is a common practice today. Thus, no matter in planning, designing, or system dispatching, it is desired to give un-interrupted electric power to customers. However, when the loading of a distribution system power feeder is too high or the feeder needs to be maintained, the feeder load should be transferred to other feeder. There are two types of feeder load transferring, interrupted and un-interrupted. The un-interrupted type means that the electric power supplied to customers will not be interrupted during feeder load transferring. However, there are several factors to affect the feeder current magnitude during load transferring, such as transformer impedances, primary side power level, and original loading of the feeder. If the current is too high, the feeder protection system will trip the feeder breakers to shut down the power supply system. A novel approach is presented to reduce the feeder current magnitude during load transferring. The phasor measurement units (PMU) will be used to obtain the synchronous voltage magnitude and phase angle of the transformers, of which feeders are transferred. A power conditioner is installed in the secondary side of the transformer. Then the phase angle values from the PMUs will be sent to the power conditioner and the suitable phase shifting will be used to reduce the phase angle difference between the two transformers. The simulation results show the feeder current magnitude will be greatly reduced during load transferring. The power supply reliability is raised.

关键词： Phasor measurement units

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Energy and distance factor based routing protocol for wireless sensor networks using mobile agents

Energy and distance factor based routing protocol for wirele...

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International Conference on Recent Advances in Space Technologies

作者： Akbulut, Akhan Parmaksizoglu, Cihangir Zaim, A. Halim Yilmaz, Guray Dep. of Computer Eng. Istanbul Kltr University Turkey Network and System Integration Alcatel-Lucent Turkey Institute of Graduate Studies in Science and Engineering Istanbul Commerce University Turkey

ISBN: (纸本)9781424496143

The wireless sensor networks are networks of compact micro-sensors for data acquisition or monitoring some environment characteristics, such as temperature, sound, vibration, pressure and motion. These sensors are embedded devices capable of data communication. In many applications, sensor nodes are distributed or dep.oyed over a geo-graphically large area. Due to their structure, data of measured values must be transferred among stations through these sensor nodes. For this reason a successful, energy efficient, fault tolerant routing protocol should be implemented to pre-vent data loss and other challenges within limited energy levels. This paper presents an agent based routing algorithm for wireless sensor networks, based on the selection of the idea of active nodes. Our proposed routing algorithm is related with energy and distance factors of each nodes. The main objective is to increase the lifetime of a sensor network while not compromising data delivery. Critical tasks such as measuring, analyzing and monitoring of energy levels of nodes are handled by these autonomous mechanisms. © 2011 IEEE.

关键词： Routing protocols

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A novel piezoelectric micro-gripper's control study

A novel piezoelectric micro-gripper's control study

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2011 International Conference on Internet Computing and Information Services, ICICIS 2011

作者： Zeng, Xiangjin Huang, Xinhan Hubei Province Key Laboratory of Intelligent Robot Wuhan Institute of Technology 430073 Wuhan China School of Computer Science and Engineering Wuhan Institute of Technology 430073 Wuhan China Dep. of Control Science and Engineering Huazhong University of Science and Technology 430074 Wuhan China

ISBN: (纸本)9780769545394

In this paper, we develop a micro-gripper that actuated by piezoelectric cantilever for the need of micro parts assembly. The displacement-voltage relationship model is given. For hysteresis of piezoelectric ceramic, we present a mix control algorithm, which employs the hysteresis offset control model based on Dahl and PID control model. The results of micro-assembly prove that the model is efficiency. © 2011 IEEE.

关键词： Hysteresis

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Multiple acoustic sources localization using incident Signal Power comparison

Multiple acoustic sources localization using incident Signal...

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IEEE Conference on Advanced Video and Signal Based Surveillance (AVSS)

作者： Daniele Salvati Antonio Rodà Sergio Canazza Gian Luca Foresti Dep. of Mathematics and Computer Science University of Udine Italy Sound and Music Computing Group Dep. of Information Engineering University of Padova Italy

We present a novel approach to locate multiple acoustic sources in far-field environments, in order to solve an interesting problem in different application domain, such as: audio surveillance systems and soundscape analysis frameworks. This approach aims at finding a solution to the ambiguities in Direction Of Arrivals (DOAs) combination caused by simultaneous multiple sources. The algorithm is based on two steps: the separation of the sources by means of beamforming techniques and the comparison of the Incident Signal Power (ISP) spectrum by means of a spectral distance measure. We implemented a prototype, composed by two linear arrays, that has been successfully tested in a real noisy environment.

关键词： Direction of arrival estimation Array signal processing Estimation Sensor arrays Microphone arrays Acoustics

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Spatial and temporal mapping of leaf area index in Alpine pastures and meadows with satellite MODIS imagery

Spatial and temporal mapping of leaf area index in Alpine pa...

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International Workshop on The Analysis of Multi-temporal Remote Sensing Images

作者： Pasolli, Luca Notarnicola, Claudia Bruzzone, Lorenzo Zebisch, Marc Dep. of Information Engineering and Computer Science University of Trento Via Sommarive 14 I-38123 Trento Italy Institute for Applied Remote Sensing EURAC Research Viale Druso 1 I-39100 Bolzano Italy

ISBN: (纸本)9781457712036

This paper presents an improved algorithm for the retrieval of leaf area index (LAI) from satellite MODIS imagery specifically calibrated for Alpine meadows and pastures. The main features of the proposed algorithm, which is based on the inversion of a radiative transfer model, are: i) the improved spatial resolution (250 meters) with respect to the MODIS standard LAI product, and ii) the tuning of the retrieval system on the spectral characteristics of Alpine meadows and pastures. The analysis of a 10 year time series of LAI maps obtained with the proposed algorithm in comparison with both the MODIS standard LAI product and field measurements confirms the effectiveness of the technique presented for spatially and temporally mapping LAI in Alpine areas at regional scale. © 2011 IEEE.

关键词： Satellite imagery

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Business Process Service Oriented Methodology (BPSOM) with service generation in SoaML

Business Process Service Oriented Methodology (BPSOM) with s...

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Lecture Notes in computer science

作者： Delgado, Andrea Ruiz, Francisco De Guzmán, Ignacio García-Rodríguez Piattini, Mario Computer Science Institute Faculty of Engineering University of the Republica Julio Herrera y Reissig 565 Montevideo Uruguay Alarcos Research Group Information Tech. and Systems Dep. University of Castilla-La Mancha Paseo de la Universidad No.4 Ciudad Real Spain

ISBN: (纸本)9783642216398

Carrying out business processes by means of software services helps to close the business-systems gap, by introducing an intermediate layer between business process definition and software systems, thus permitting not only better indep.ndence, but also more traceability between them. Despite the fact that technologies have matured to support this new reality, there is a lack of methodologies and notations, although some have been proposed to guide service development with different visions of service design and implementation. Service modeling is the basis for, among other things, the automation of several development steps by means of the model-driven development paradigm. The SoaML standard is a major step towards service modeling in UML. In this paper we extend our Business Process Service Oriented Methodology (BPSOM) for service development from business processes by integrating two main aspects: service modeling using SoaML and QVT transformations to obtain SoaML service models from BPMN BP models. © 2011 Springer-Verlag.

关键词： Enterprise resource management

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Latency hiding and performance tuning with graph-based execution

Latency hiding and performance tuning with graph-based execu...

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1st International Workshop on Data-Flow Models, DFM 2011

作者： Cicotti, Pietro Baden, Scott B. San Diego Supercomputer Center University of California San Diego 9500 Gilman Dr. San Diego CA 92093-0505 United States Dep. of Computer Science and Engineering University of California San Diego 9500 Gilman Dr. San Diego CA 92093-0505 United States

ISBN: (纸本)9780769546469

In the current practice, scientific programmer and HPC users are required to develop code that exposes a high degree of parallelism, exhibits high locality, dynamically adapts to the available resources, and hides communication latency. Hiding communication latency is crucial to realize the potential of today's distributed memory machines with highly parallel processing modules, and technological trends indicate that communication latencies will continue to be an issue as the performance gap between computation and communication widens. However, under Bulk Synchronous Parallel models, the predominant paradigm in scientific computing, scheduling is embedded into the application code. All the phases of a computation are defined and laid out as a linear sequence of operations limiting overlap and the program's ability to adapt to communication delays. In this paper we present an alternative model, called Tarragon, to overcome the limitations of Bulk Synchronous Parallelism. Tarragon, which is based on dataflow, targets latency tolerant scientific computations. Tarragon supports a task-dep.ndency graph abstraction in which tasks, the basic unit of computation, are organized as a graph according to their data dep.ndencies, i.e. task precedence. In addition to the task graph, Tarragon supports metadata abstractions, annotations to the task graph, to express locality information and scheduling policies to improve performance. Tarragon's functionality and underlying programming methodology are demonstrated on three classes of computations used in scientific domains: structured grids, sparse linear algebra, and dynamic programming. In the application studies, Tarragon implementations achieve high performance, in many cases exceeding the performance of equivalent latency-tolerant, hard coded MPI implementations. © 2011 IEEE.

关键词： Linear algebra

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Average Consensus and Gossip Algorithms in Networks with Stochastic Asymmetric Communications

Average Consensus and Gossip Algorithms in Networks with Sto...

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IEEE Conference on Decision and Control

作者： Duarte Antunes Daniel Silvestre Carlos Silvestre Department of Mechanical Engineering Eindhoven University of Technology the Netherlands Dep. of Electrical Eng. and Computer Science Instituto Superior Tecnico ISR 1046-001 Lisboa Portugal

ISBN: (纸本)9781612848006

We consider that a set of distributed agents desire to reach consensus on the average of their initial state values, while communicating with neighboring agents through a shared medium. This communication medium allows only one agent to transmit unidirectionally at a given time, which is true, e.g., in wireless networks. We address scenarios where the choice of agents that transmit and receive messages at each transmission time follows a stochastic characterization, and we model the topology of allowable transmissions with asymmetric graphs. In particular, we consider: (i) randomized gossip algorithms in wireless networks, where each agent becomes active at randomly chosen times, transmitting its data to a single neighbor;(ii) broadcast wireless networks, where each agent transmits to all the other agents, and access to the network occurs with the same probability for every node. We propose a solution in terms of a linear distributed algorithm based on a state augmentation technique, and prove that this solution achieves average consensus in a stochastic sense, for the special cases (i) and (ii). Expressions for absolute time convergence rates at which average consensus is achieved are also given.

关键词： Agents Wireless networks transmission time Gossip TRANSMITTING Communications Media Stochastic Network INITIAL CONDITIONS network access

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