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Fine-tuning triplification with Semion

Fine-tuning triplification with Semion

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1st Workshop on Knowledge Injection into and Extraction from Linked Data, KIELD 2010

作者： Nuzzolese, Andrea Giovanni Gangemi, Aldo Presutti, Valentina Ciancarini, Paolo Semantic Technology Lab. ISTC-CNR Rome. Italy Dep. of Computer Science Università di Bologna Italy

The Web of Data is fed mainly by "triplifiers (or RDFizers)", tools able to transform content (usually from databases) to linked data. Current triplifiers implement diverse methods, and are usually based on bulk recipes, which make fixed assumptions on the domain semantics. They focus more on syntactic than on semantic transformation, and allow for limited (sometimes no) customization of the process. We present Semion, a method and a tool for triplifying content sources that overcomes such limitations. It focuses on applying good practices of design, provides high customizability of the transformation process, and exploits OWL expressivity for describing the domain of interest.

关键词： Semantic Web

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A performance study of a consensus clustering algorithm and properties of partition graph

A performance study of a consensus clustering algorithm and ...

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2010 IEEE International Conference on Computational Intelligence and Computing Research, ICCIC 2010

作者： Rao, P.R. Da Costa, J.P. Pinto Department of Computer Science and Technology Goa University India Dep. de Matematica Aplicada and LIACC Universidade Do Porto Portugal

ISBN: (纸本)9781424459674

By applying several clustering algorithms to a dataset E or the same algorithm with different parameters, we get several partitions of the dataset E. The problem of finding the best partition among these partitions is considered in this paper. The best partition, also called as consensus partition, minimizes the average number of disagreements between all the partitions. The first step consists of determining candidate consensus partitions. Then the distance between each candidate consensus partition and each of the given partitions is determined. A consensus partition is one whose total distance is minimum. Two distance criteria are used. These distances have interpretations as particular parameters of a graph called partition graph. Some properties of this graph are determined. A structurally simple graph called strong pattern graph is defined, which happens to be a perfect graph. © 2010 IEEE.

关键词： Clustering algorithms

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Hybrid population-based incremental learning to assign terminals to concentrators

Hybrid population-based incremental learning to assign termi...

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作者： Bernardino, Eugenia Moreira Bernardino, Anabela Moreira Sánchez-Pérez, Juan Manuel Gómez-Pulido, Juan Antonio Vega-Rodríguez, Miguel Angel Dep. of Computer Science Polytechnic Institute of Leiria School of Technology and Management Leiria Portugal Dep. of Technologies of Computers and Communications Polytechnic School University of Extremadura Cdceres Spain

ISBN: (纸本)9789898425317

In the last decade, we have seen a significant growth in communication networks. In centralised communication networks, a central computer serves several terminals or workstations. In large networks, some concentrators are used to increase the network efficiency. A collection of terminals is connected to a concentrator and each concentrator is connected to the central computer. In this paper we propose a Hybrid Population-based Incremental Learning (HPBIL) to assign terminals to concentrators. We use this algorithm to determine the minimum cost to form a network by connecting a given collection of terminals to a given collection of concentrators. We show that HPBIL is able to achieve good solutions, improving the results obtained by previous approaches.

关键词： Population statistics

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Path capacity of multi-channel multi-hop IEEE 802.11 wireless networks with channel switching

Path capacity of multi-channel multi-hop IEEE 802.11 wireles...

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2010 3rd IEEE International Conference on computer Science and Information technology, ICCSIT 2010

作者： He, Pingshi Xu, Ziping Qi, Wangdong Yang, Xia Dep. of Computer Application Technology Institute of Command Automation PLAUST Nanjing China Dep. of Telecommunication Engineering Institute of Communication Engineering PLAUST Nanjing China Institute of China Electronic System Engineering Company China

ISBN: (纸本)9781424455386

The capacity problem is one of the main issues in researching the multi-channel IEEE 802.11 wireless networks. In this paper, we analyze the path capacity of the multi-channel wireless networks by estimating the RTS, CTS and the packet loss rate of the wireless links and calculating the average service time of the packet sending. We also analyze the channel assignment and channel switching problems and present the Neighborhood Channel Concentration Degree (NCCD) mechanism which can distribute network load into the available channels and increase the total throughput of the network. We use ns-2 as the simulator to simulate the network throughput using our NCCD and compare with the throughput of the MCR mechanism. The results show that NCCD can significantly increase the network throughput. © 2010 IEEE.

关键词： Packet networks

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An architectural framework for Quantum Algorithms Processing Unit (QAPU)

An architectural framework for Quantum Algorithms Processing...

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作者： Aghaei, Mohammad Reza Soltan Zukarnain, Zuriati Ahmad Mamat, Ali Zainuddin, Hishamuddin Dep. of Computer Eng. Islamic Azad University of Khorasgan Isfahan Iran Dep. of Communication Technology and Network Faculty of Computer Science and Information Technology University Putra Malaysia UPM 43400 Serdang Selangor Malaysia UPM 43400 Serdang Selangor Malaysia

ISBN: (纸本)9789881701282

The focus of this study is developing a framework of Quantum Algorithm Processing Unit (QAPU). The framework shows a general plan for the architecture of quantum processor that is able to run quantum algorithms. The framework is used to increase the implementation performance of quantum algorithms and design Quantum Processing Unit (QPU). QAPU can be applied as a quantum node to design quantum multicomputer. At first, the hybrid architecture is designed for the quantum algorithms. Then, the relationships between the classical and quantum parts of the hybrid algorithms are extracted and the main stages of the hybrid architecture are determined. Next, the framework of QAPU is designed and developed. Some gates and connections are projected in the framework that can be applied for future quantum algorithms. Furthermore, the framework is implemented and simulated for the existing quantum algorithms on a classic computer. It is shown that the framework is appropriate for the quantum algorithms.

关键词： computer architecture

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Solving the ring arc-loading problem using a hybrid scatter search algorithm

Solving the ring arc-loading problem using a hybrid scatter ...

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作者： Bernardino, Anabela Moreira Bernardino, Eugénia Moreira Sánchez-Pérez, Juan Manuel Gómez-Pulido, Juan Antonio Vega-Rodríguez, Miguel Angel Dep. of Computer Science School of Technology and Management Polytechnic Institute of Leiria Leiria Portugal Dep. of Technologies of Computers and Communications Polytechnic School University of Extremadura Cáceres Spain

ISBN: (纸本)9789898425317

Resilient Packet Ring (RPR) is a standard that uses Ethernet switching and a dual counter-rotating ring topology to provide SONET-like network resiliency and optimised bandwidth usage, while it delivers multipoint Ethernet/IP services. An important optimisation problem arising in this context is the Weighted Ring Arc Loading Problem (WRALP). That is the design of a direct path for each request in a communication network, in such a way that high load on the arcs will be avoided, where an arc is an edge endowed with a direction. The load of an arc is defined as the total weight of those requests routed through the arc in its direction. WRALP ask for a routing scheme such that the maximum load on the arcs will be minimum. In this paper we study the loading problem without demand splitting and for solving it we propose a Hybrid Scatter Search (HSS) algorithm. Coupled with the Scatter Search algorithm we use a Tabu Search algorithm to locate the global minimum. We show that HSS is able to achieve feasible solutions to WRALP instances, improving the results obtained by previous approaches.

关键词： Global optimization

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A statistical learning approach to spatial context exploitation for semantic image analysis

A statistical learning approach to spatial context exploitat...

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International Conference on Pattern Recognition

作者： Papadopoulos, G.Th. Mezaris, V. Kompatsiaris, I. Strintzis, M.G. Electrical and Computer Eng. Dep. Aristotle Univ. of Thessaloniki Greece Informatics and Telematics Institute Centre for Research and Technology Hellas Greece

ISBN: (纸本)9780769541099

In this paper, a statistical learning approach to spatial context exploitation for semantic image analysis is presented. The proposed method constitutes an extension of the key parts of the authors' previous work on spatial context utilization, where a Genetic Algorithm (GA) was introduced for exploiting fuzzy directional relations after performing an initial classification of image regions to semantic concepts using solely visual information. In the extensions reported in this work, a more elaborate approach is followed during the spatial knowledge acquisition and modeling process. Additionally, the impact of every resulting spatial constraint on the final outcome is adaptively adjusted. Experimental results as well as comparative evaluation on three datasets of varying complexity in terms of the total number of supported semantic concepts demonstrate the efficiency of the proposed method. © 2010 IEEE.

关键词： Genetic algorithms

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Generalized direct power control for grid connected multilevel converters

Generalized direct power control for grid connected multilev...

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IEEE-ICIT 2010 International Conference on Industrial technology, ICIT 2010

作者： Rivera, Sebastián Kouro, Samir Cortés, Patricio Alepuz, Salvador Malinowski, Mariusz Wu, Bin Rodríguez, José Dep. of Electronics Engineering Universidad Técnica Federico Santa María Valparaiso Chile Dep. of Electrical and Computer Engineering Ryerson University Toronto ON Canada Dep. of Electronics Engineering Technical University of Catalonia Barcelona Spain Institute of Control and Industrial Electronics Warsaw University of Technology Warsaw Poland

ISBN: (纸本)9781424456970

This paper presents a generalized direct power control (DPC) scheme for grid connected multilevel converters. The proposed method extends the original DPC operating principle by considering only for selection the closest vectors to the present switching state. This approach requires the power derivatives for feedback, which can present numerical implementation problems in real time. Therefore a grid virtual flux based observer is proposed to overcome this issue. The proposed method is applicable to any multilevel converter topology of any number of levels. In this paper simulations results are presented for a 9 level cascaded H-bridge converter. The proposed solution enables DPC for multilevel converters used in medium voltage applications while improving overall power quality and efficiency of the system. ©2010 IEEE.

关键词： Power converters

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Study on a novel DC/DC converter based on interleaved parallel

Study on a novel DC/DC converter based on interleaved parall...

引用

2nd International Workshop on Intelligent Systems and Applications, ISA2010

作者： Xin, Yibo Wu, Xin Fang, Huajing Dep.of Control Science and Engineering HuaZhong University of Science and Technology Wuhan China Dep. of Electrical Engineering and Automation Luoyang Institute of Science and Technology Luoyang 471023 China Dep.of Computer and Information Engineering Luoyang Institute of Science and Technology Luoyang China

ISBN: (纸本)9781424458745

This paper introduces the design of the parallel connection of DC/DC power supplies. The topology of system configuration and performed modeling were stated. The problems such as the ripple electric current sharing of parallel connected DC power modules, and the circuit and the working mode of the DC/DC modules, the configuration of the parallel connection and their solutions were discussed .The system control strategy were analyzed and simulated based on MATLAB/Pspice. The experimental results verify that the parallel connection of DC/DC power is suitable for the low-voltage high-current output DC-DC converter. ©2010 IEEE.

关键词： DC-DC converters

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Face detection based on feature analysis and edge detection against skin color-like backgrounds

Face detection based on feature analysis and edge detection ...

引用

International Conference on Genetic and Evolutionary Computing

作者： Huang, Deng-Yuan Lin, Ta-Wei Ho, Chun-Ying Hu, Wu-Chih Department of Electrical Engineering Dayeh University Changhua Taiwan Dep. of Computer Science and Information Engineering National Penghu University of Science and Technology Penghu Taiwan

ISBN: (纸本)9780769542812

In this paper, we propose a method of face detection based on feature analysis and edge detection against skin colorlike backgrounds. The proposed method consists of three phases including image preprocessing, skin color segmentation, and determination of face candidates. First, the objects in foreground are separated by image preprocessing. Second, the non-skin color objects are rejected by the method of skin color segmentation. Finally, both the elimination of skin color-like blobs in backgrounds and face detection are performed by the method of determination of face candidates. Experimental results show that the proposed method can effectively detect most of faces in skin color-like backgrounds. In addition, detection of face images with pose and expression variations or against dark backgrounds are also carried out. © 2010 IEEE.

关键词： Face recognition

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