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The deletion operation in xBR-trees

The deletion operation in xBR-trees

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2012 16th Panhellenic Conference on Informatics, PCI 2012

作者： Roumelis, George Vassilakopoulos, Michael Corral, Antonio Information Processing and Management Lab. Dept. of Computer Science and Biomedical Informatics University of Central Greece Lamia Greece Dept. of Languages and Computing University of Almeria Almeria Spain

ISBN: (纸本)9780769548258

In order to design a spatial index, the most important operations are: insertion, deletion and search. We focus on the deletion operation over the xBR-tree, a spatial data secondary memory structure that belongs to the Quad tree family. The algorithm of handling deletions is presented, taking into account that the deletion of a leaf item may cause entries deletions from internal nodes. The well-known merging technique is applied, to retain the efficiency of the xBR-tree. © 2012 IEEE.

关键词： Trees (mathematics)

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Discovering hidden pathways in bioinformatics 1

引用

8th International Meeting on Computational Intelligence Methods for Bioinformatics and Biostatistics, CIBB 2011

作者： Lisboa, Paulo J. G. Jarman, Ian H. Etchells, Terence A. Chambers, Simon J. Bacciu, Davide Whittaker, Joe Garibaldi, Jon M. Ortega-Martorell, Sandra Vellido, Alfredo Ellis, Ian O. School of Computing and Mathematical Sciences Liverpool John Moores University United Kingdom Dept. of Computer Science University of Pisa Italy Dept. of Mathematics and Statistics University of Lancaster United Kingdom School of Computer Science University of Nottingham United Kingdom Dept. of Biochemistry and Molecular Biology Universitat Autònoma de Barcelona Spain Dept. of Computer Languages and Systems Universitat Politècnica de Catalunya Spain Dept. of Histopathology School of Molecular Medical Sciences University of Nottingham United Kingdom

ISBN: (数字)9783642356865

ISBN: (纸本)9783642356858

The elucidation of biological networks regulating the metabolic basis of disease is critical for understanding disease progression and in identifying therapeutic targets. In molecular biology, this process often starts by clustering expression profiles which are candidates for disease phenotypes. However, each cluster may comprise several overlapping processes that are active in the cluster. This paper outlines empirical results using methods for blind source separation to map the pathways of biomarkers driving independent, hidden processes that underpin the clusters. The method is applied to a protein expression data set measured in tissue from breast cancer patients (n=1,076). © Springer-Verlag 2012.

关键词： Molecular biology

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computer-supported assessment of wikis in higher education: Two case studies

Computer-supported assessment of wikis in higher education: ...

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International Symposium on computers in Education (SIIE)

作者： Manuel Palomo-Duarte Juan Manuel-Dodero Antonio García-Domínguez Pablo Neira-Ayuso Noelia Sales-Montes Inmaculada Medina-Bulo Francisco Palomo-Lozano Carmen Castro-Cabrera Emilio J. Rodríguez-Posada Dept. of Computer Science University of Cádiz Spain Dept. of Computer Languages and Systems University of Seville Spain

In recent years, the focus on higher education learning has shifted from knowledge to skills, with the interpersonal skills likely being the most difficult to assess and work with. Wikis ease open collaboration among peers. The massive adoption of computers and the Internet both in the classroom and by students makes it possible to use them for grading. A number of these skills can be assessed by using wikis in an university-level educational environment: collaborative writing, conflict resolution, group management, leadership, etc. However, the sole use of wikis does not guarantee success, as there are many variables that affect the experience. In this paper we compare two case studies conducted in the University of Cádiz, Spain. We pay attention to the different settings in each one, and how they can affect the final result of the experience. They were conducted in courses belonging to computer science Degrees. However, they differ in duration, milestones, contribution size, weight in the final grade and, specially, in the assessment method. When a group of students work in a wiki, they produce a lot of information that is hard to evaluate in detail. We discuss and compare the different methods and tools used to assess the desired skills in each case study. We sum up some of the lessons learned in our conclusions.

关键词： Internet Electronic publishing Encyclopedias Software Collaboration Educational institutions

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A new enterprise security pattern: Secure Software as a Service (SaaS)

A new enterprise security pattern: Secure Software as a Serv...

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9th International Workshop on Security in Information Systems, WOSIS 2012, in Conjunction with ICEIS 2012

作者： Moral-García, Santiago Moral-Rubio, Santiago Fernández, Eduardo B. Fernández-Medina, Eduardo Kybele Research Group Dept. of Computer Languages and Systems II Rey Juan Carlos University Madrid Spain BBVA Group Madrid Spain Secure Systems Research Group Dept. of Comp. and Elect. Eng. and Comp. Science Florida Atlantic University Boca Raton FL United States GSyA Research Group Dept. of Information Technologies and Systems University of Castilla-La Mancha Ciudad Real Spain

ISBN: (纸本)9789898565150

In recent years, the hiring of Software as a Service (SaaS) from cloud providers has become very popular. The advantages of using these services seem to be many, but organizations need to know and handle a variety of threats. Before using SaaS, organizations should check the security measures offered by the service provider and the defense mechanisms included in their enterprise security architectures. Security patterns are a good way to build and test new security mechanisms, but they have some limitations related to their usability. In order to improve the usability of security patterns, we have defined a new type of security pattern called Enterprise Security Pattern. In this paper, we show a brief description of enterprise security patterns, and document a new pattern that the organizations could apply to protect their information assets when using SaaS.

关键词： Software as a service (SaaS)

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Summarizing frequent itemsets via pignistic transformation

Summarizing frequent itemsets via pignistic transformation

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15th Portuguese Conference on Artificial Intelligence, EPIA 2011

作者： Guil-Reyes, Francisco Daza-Gonzalez, María Teresa Dept. Languages and Computer Science University of Almería 04120 Almería Spain Dept. Neuroscience and Health Care University of Almería 04120 Almería Spain

ISBN: (纸本)9783642247682

Since the proposal of the well-known Apriori algorithm and the subsequent establishment of the area known as Frequent Itemset Mining, most of the scientific contribution of the data mining area have been focused on the study of methods that improve its efficiency and its applicability in new domains. The interest in the extraction of this sort of patterns lies in its expressiveness and syntactic simplicity. However, due to the large quantity of frequent patterns that are generally obtained, the evaluation process, necessary for obtaining useful knowledge, it is difficult to be achieved in practice. In this paper we present a formal method to summarize the whole set of mined frequent patterns into a single probability distribution in the framework of the Transferable Belief Model (TBM). The probability function is obtained applying the Pignistic Transformation on the patterns, obtaining a compact model that synthesizes the regularities present in the dataset and serves as a basis for the knowledge discovery and decision making processes. In this work, we also present a real case study by describing an application of our proposal in the field of Neuroscience. In particular, our main goal is focused on the behavioral characterization, via pignistic distribution on attentional cognitive variables, of group of children pre-diagnosed with one of the three types of ADHD (Attention Deficit Hyperactivity Disorder). © 2011 Springer-Verlag.

关键词： Data mining

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Buoy-to-ship experimental measurements over sea at 5.8 GHz near urban environments

Buoy-to-ship experimental measurements over sea at 5.8 GHz n...

引用

2011 11th Mediterranean Microwave Symposium, MMS 2011

作者： Reyes-Guerrero, J.C. Bruno, M. Mariscal, Luis A. Medouri, Abdellatif Dept. of Computer Languages and Systems Nautical Science Faculty University of Cadiz Puerto Real Spain Dept. of Statistics and Informatics Polydisciplinary Faculty University of Abdelmalek Essaâdi Tetuan Morocco

ISBN: (纸本)9781457718151

Current marine wireless communication systems used for monitoring applications based on buoys suffer from lots of weakness. Many research works concern the design and development of new technological applications to improve marine communications. Particularly, a wireless communication system based on WiMAX standard at the 5.8 GHz band (license-exempt band) could be a good candidate. As an initial task, a propagation channel measurement campaign in maritime environments was carried out to investigate the impact of the wireless channel in different situations. This work provides large scale path loss measurements over sea around urban environments. In particular, a radio link between a buoy and a ship at 5.8 GHz is studied. NLOS (Non-Line-Of-Sight) paths are investigated in dept. and they are compared to LOS (Line-Of-Sight) paths. The designed measurement system is described and the experimental measurements are shown. An empirical model is obtained using these experimental data and the key wireless channel parameters are analyzed. In addition, the empirical model is compared to the free space and two-ray theoretical models. This investigation is useful, among others, for planning Worldwide Interoperability for Microwave Access (WiMAX) networks offshore around these challenge environments. © 2011 IEEE.

关键词： Wimax

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Nearest Neighbor Algorithms using xBR-Trees

Nearest Neighbor Algorithms using xBR-Trees

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15th Panhellenic Conference on Informatics, PCI 2011

作者： Roumelis, George Vassilakopoulos, Michael Corral, Antonio Master in Information Systems Open University of Cyprus Nicosia Cyprus Dept. of Computer Science and Biomedical Informatics University of Central Greece Lamia Greece Dept. of Languages and Computing University of Almeria Almeria Spain

ISBN: (纸本)9780769543895

One of the common queries in spatial databases is the (K) Nearest Neighbor Query that discovers the (K) closest objects to a query object. Processing of spatial queries, in most cases, is accomplished by indexing spatial data by an access method. In this paper, we present algorithms for Nearest Neighbor Queries using a disk based structure that belongs to the Quadtree family, the xBR-tree, that can be used for indexing large point datasets. We demonstrate performance results (I/O efficiency and execution time) of alternative Nearest Neighbor algorithms, using real datasets. © 2011 IEEE.

关键词： Query processing

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computer assisted determination of mandibular cystic lesion volume from computed tomographic data

Computer assisted determination of mandibular cystic lesion ...

引用

2011 1st Middle East Conference on Biomedical Engineering, MECBME 2011

作者： Nassef, Tamer M. Fliefel, Reham M. Marei, Mona K. Solouma, Nahed H. Kadah, Yasser M. Computer and Programming Engineering Dept. Misr. University for Science and Technology MUST 6th of October City Egypt Tissue Engineering Lab. Alexandria University Alexandria Egypt National Institute of Laser Science Cairo University Giza Egypt Biomedical Engineering Dept. Cairo University Giza Egypt

ISBN: (纸本)9781424470006

In this paper, a new approach for computing different anatomical regions in dental Computed Tomography (CT) is presented. The approach consists of two steps. First, a HU threshold window sets to separate between different regions upon their gray-level values;second, a set of objects are generated and texture descriptors are calculated for selected windows from the image data sample. Finally, identification of different anatomical regions set for mandible bones to determine the cystic lesion volume based on numerical methods. Preliminary results obtained for dental CT of female patient aged 14 years old complaining of bilateral swelling in her mandible are presented. © 2011 IEEE.

关键词： Tissue engineering

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Extraction of human mandible bones from multi-slice computed tomographic data

Extraction of human mandible bones from multi-slice computed...

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2011 1st Middle East Conference on Biomedical Engineering, MECBME 2011

作者： Nassef, Tamer M. Solouma, Nahed H. Alkhodary, Mohamed Marei, Mona K. Kadah, Yasser M. Computer and Programming Engineering Dept. Misr University for Science and Technology MUST 6th of October City Egypt National Institute of Laser Science Cairo University Giza Egypt Tissue Engineering Lab. Alexandria University Alexandria Egypt Biomedical Engineering Dept. Cairo University Giza Egypt

ISBN: (纸本)9781424470006

A new approach for segmenting different anatomical regions in dental Computed Tomography (CT) studies is presented in this paper. It is expected that the proposed approach will help automate different tissues regions by providing initial boundary points for deformable models or seed points for split and merge segmentation algorithms. Preliminary results obtained for dental CT studies of dentate and edentulous human-mandible are presented with finite element models divided by tetrahedral elements, which built based on actual CT data combined with triangulation equations. Identification of different anatomical regions set for mandible cortical and cancellous bones by generated 3D models by marching cubes technique. © 2011 IEEE.

关键词： Medical imaging

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Design of a framework for personalized microlearning

Design of a framework for personalized microlearning

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IADIS International Conference e-Learning 2011, Part of the IADIS Multi Conference on computer science and Information Systems 2011, MCCSIS 2011

作者： Coccoli, Mauro Mercurio, Marco Torre, Ilaria Torsani, Simone Dept. of Computer Communications and Systems Science University of Genoa Via Opera Pia 13 16145 Genova Italy Dept. of Linguistic Cultural and Communication Sciences University of Genoa Piazza Santa Sabina 2 16124 Genova Italy Faculty of Foreign Languages and Literatures University of Genoa Piazza Santa Sabina 2 16124 Genova Italy

ISBN: (纸本)9789728939380

Instructional Design for e-learning is changing under the influence of advances in technological fields such as the Semantic Web, adaptive systems, mobile technologies, etc. In this scenario, Microlearning is a new educational approach, whose origin is related to the spreading behavioral tendency to ubiquitous computing. It seeks to adapt education to the new condition of mobility and continuous computing by framing learning content into micro-units and providing them to learners during the day as short effort micro-activities. In this paper the authors propose a framework for the development of microlearning systems, exploiting the above mentioned technologies, and in particular semantic technologies for knowledge representation and adaptive techniques for microlearning personalization and adaptation to user situation. © 2011 IADIS.

关键词： Semantic Web

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