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International Conference on computer Supported Cooperative Work in Design

作者： Nelson Baloian Gustavo Zurita Flávia Maria Santoro Renata Mendes Araujo Sean Wolfgan Doulgas Machado José A. Pino Department of Computer Science Universidad de Chile Santiago Chile Management Control and Information Systems Department Business School Universidad de Chile Santiago Chile Graduate Program in Information Systems-Research and Practice Group in Technology (NP2Tec) Federal University of Rio de Janeiro Rio de Janeiro Brazil

Collaborative techniques for business process design are generally supported by groupware tools that allow process actors to interact collecting their knowledge about the activities performed. Despite success reports, challenges are still observed due to the complexity of this task. We propose to gather benefits of interviews, collaboration and visual methods in eliciting business processes in order to deal with problems identified in literature. We present an approach based on a collaborative mobile application which analysts should use while interviewing process stakeholders. The information is collected through a simple BPMN diagram through which they exchange information and build parts of the models.

关键词： Business Collaboration Interviews Logic gates Mobile handsets Visualization Mobile communication

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Which clustering algorithm is better for predicting protein complexes?

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BMC Research Notes 2011年第1期4卷 1-11页

作者： Moschopoulos, Charalampos N Pavlopoulos, Georgios A Iacucci, Ernesto Aerts, Jan Likothanassis, Spiridon Schneider, Reinhard Kossida, Sophia Bioinformatics and Medical Informatics Team Biomedical Research Foundation Academy of Athens 11527 Athens Soranou Efessiou 4 Greece Department of Computer Engineering and Informatics University of Patras Rio GR-26500 Patras Greece Department of Computer Science and Biomedical Informatics University of Central Greece 35100 Lamia Papasiopoulou 2-4 Greece ESAT-SCD IBBT-K.U. Leuven Future Health Department Katholieke Universiteit Leuven 300 Leuven Kasteelpark Arenberg 10 Belgium Bioinformatics/Structural and Computational Biology European Molecular Biology Laboratory 69117 Heidelberg Meyerhofstrasse 1 Germany Luxembourg Centre for Systems Biomedicine (LCSB) University of Luxembourg Campus Limpertsberg 1511 Luxembourg 162 A avenue de la Faencerie Luxembourg

Background: Protein-Protein interactions (PPI) play a key role in determining the outcome of most cellular processes. The correct identification and characterization of protein interactions and the networks, which they comprise, is critical for understanding the molecular mechanisms within the cell. Large-scale techniques such as pull down assays and tandem affinity purification are used in order to detect protein interactions in an organism. Today, relatively new high-throughput methods like yeast two hybrid, mass spectrometry, microarrays, and phage display are also used to reveal protein interaction networks. Results: In this paper we evaluated four different clustering algorithms using six different interaction datasets. We parameterized the MCL, Spectral, RNSC and Affinity Propagation algorithms and applied them to six PPI datasets produced experimentally by Yeast 2 Hybrid (Y2H) and Tandem Affinity Purification (TAP) methods. The predicted clusters, so called protein complexes, were then compared and benchmarked with already known complexes stored in published databases. Conclusions: While results may differ upon parameterization, the MCL and RNSC algorithms seem to be more promising and more accurate at predicting PPI complexes. Moreover, they predict more complexes than other reviewed algorithms in absolute numbers. On the other hand the spectral clustering algorithm achieves the highest valid prediction rate in our experiments. However, it is nearly always outperformed by both RNSC and MCL in terms of the geometrical accuracy while it generates the fewest valid clusters than any other reviewed algorithm. This article demonstrates various metrics to evaluate the accuracy of such predictions as they are presented in the text below. Supplementary material can be found at: http://***/ bioinformatics/projects/***. © 2011 Moschopoulos et al;licensee BioMed Central Ltd.

关键词： Spectral Cluster Affinity Propagation Valid Cluster Geometrical Accuracy Tandem Affinity Purification

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Authorship attribution as a case of anomaly detection: A neural network model

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International Journal of Hybrid Intelligent systems 2011年第4期8卷 225-235页

作者： Neme, Antonio Lugo, Blanca Cervera, Alejandra Complex Systems Group Universidad Autónoma de la Ciudad de México Mexico Konemiehentie 2 Espoo Aalto University School of Sciences Finland Coahuila Universidad Autónoma del Estado de Coahuila Saltillo Coah Mexico Department of Computer Science University of Helsinki Finland

Writings by the same author usually share specific traits, the so-called stylome, which is defined as an abstraction of the constraints and specific sequences of words and phrases used in the texts. Although identifying a stylome has been elusive, some advancements in this area have been made. Here, we present a system trained with texts from a given author that then unveiled some of its features and, in turn, detected texts not written by that author, or written within a different style. The system is based on time series processing capabilities of an unsupervised neural network model known as the self-organizing map. The core idea is that a system trained with texts by one author should detect an anomaly when presented with texts from other authors. We present results of authorship identification in several contexts including known benchmarks as well as some examples from literature, journalism, and popular science.

关键词： Authorship attribution anomaly detection self-organizing maps time series

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User-perceived reliability of shared protection systems with the Erlang type-κ repair scheme

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International Journal of Information and Communication Technology 2011年第3期3卷 209-226页

作者： Ozaki, Hirokazu Kara, Atsushi Cheng, Zixue Department of Systems and Informatics Hokkaido Information University 59-2 Nishi-Nopporo Ebetsu Hokkaido 069-8585 Japan University of Aizu Tsuruga Ikki-machi Aizu-Walamatsu Fukushima 965-8580 Japan Department of Computer Science and Engineering University of Aizu Tsuruga Ikki-machi Aizu-Walamatsu Fukushima 965-8580 Japan

This paper describes the availability and mean time to first failure (MTTFF) of M-for-N shared protection systems (with M + N units) from the viewpoint of an arbitrary one of the N end users. Various forms of M-for-N shared protection are used to improve the reliability of telecommunication network devices such as access node devices, routers, switches, servers, network address translators, etc. In this paper, the time between failures of units and the time for repair are assumed to be an exponential distribution and the Erlang type-κ distribution respectively. We consider the Erlang type-κ distribution because repair time does not necessarily follow the exponential distribution and the Erlang type-κ distribution is more flexible and useful for determining the system parameters such as the mean repair time and the variance based on the reliability objectives. The purpose of this paper is to evaluate the user-perceived reliability of such systems in a quantitative manner. Copyright © 2011 Inderscience Enterprises Ltd.

关键词： Repair

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Compressive System Identification of LTI and LTV ARX Models

Compressive System Identification of LTI and LTV ARX Models

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IEEE Conference on Decision and Control

作者： Borhan M. Sanandaji Tyrone L. Vincent Michael B. Wakin Roland Toth Kameshwar Poolla Department of Electrical Engineering and Computer Science Colorado School of Mines Golden CO 80401 USA Delft Center for Systems and Control Delft University of Technology Mekelweg 2 2628 CD Delft The Netherlands Departments of Electrical Engineering and Computer Sciences and Mechanical Engineering University of California Berkeley CA 94720 USA

ISBN: (纸本)9781612848006

In this paper, we consider identifying Auto Regressive with eXternal input (ARX) models for both Linear Time-Invariant (LTI) and Linear Time-Variant (LTV) systems. We aim at doing the identification from the smallest possible number of observations. This is inspired by the field of Compressive Sensing (CS), and for this reason, we call this problem Compressive System Identification (CSI). In the case of LTI ARX systems, a system with a large number of inputs and unknown input delays on each channel can require a model structure with a large number of parameters, unless input delay estimation is performed. Since the complexity of input delay estimation increases exponentially in the number of inputs, this can be difficult for high dimensional systems. We show that in cases where the LTI system has possibly many inputs with different unknown delays, simultaneous ARX identification and input delay estimation is possible from few observations, even though this leaves an apparently ill-conditioned identification problem. We discuss identification guarantees and support our proposed method with simulations. We also consider identifying LTV ARX models. In particular, we consider systems with parameters that change only at a few time instants in a piecewise-constant manner where neither the change moments nor the number of changes is known a priori. The main technical novelty of our approach is in casting the identification problem as recovery of a block-sparse signal from an underdetermined set of linear equations. We suggest a random sampling approach for LTV identification, address the issue of identifiability and again support our approach with illustrative simulations.

关键词： LTI System identification delay estimation Mathematic Identifiability Model structures

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Bis(alkyl-thiophene) thienothiophene as hole-transport organic semiconductor

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Physics Procedia 2011年 14卷 182-186页

作者： Kazuhiro Takamiya Shuhei Ishikawa Daisuke Adachi Shinya Oku Shuichi Nagamatsu Wataru Takashima Shuzi Hayase Keiichi Kaneto Graduate School of Life Science and Systems Engineering Kyushu Institute of Technology 2-4 Hibikino Wakamatsu Kitakyushu Fukuoka 808-0196 Japan Department of Computer Science and Electronics Kyushu Institute of Technology 680-4 Kawazu Iizuka Fukuoka 820-8502 Japan Research Center for Advanced Eco-fitting Technology Kyushu Institute of Technology 2-4 Hibikino Wakamatsu Kitakyushu Fukuoka 808-0196 Japan

π-conjugated low-molecules having the chemical structure of bis(alkyl-thiophene)thienothiophene, abbreviated as, C6-BTTT and C12-BTTT were synthesized and evaluated in their thermal, optical and electronic characteristics. Compounds were synthesized according with Suzuki reaction or Stille reaction. Thermal analysis represents both of C6- and C12-BTTTs did not possess liquid-crystalline phase. Comparison of hole transport characteristics shows a relative high hole transport in C6-BTTT and high air-stability in C12-BTTT, representing a contribution of alkyl-substituent.

关键词： Organic semiconductor hole transoprt carrier trap alkyl-substituent thienothiophene derivative

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Resource Allocation in Ad Hoc Networks with Two-Hop Interference Resolution

Resource Allocation in Ad Hoc Networks with Two-Hop Interfer...

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2011 IEEE Global Telecommunications Conference - GLOBECOM 2011

作者： Stephane Pomportes Anthony Busson Joanna Tomasik Veronique Veque Laboratoire des signaux et systémes (L2S) Supèlec Université Paris-Sud XI Gif-sur-Yvette France Computer Science Department E3S-SUPELEC Systems Sciences Gif-sur-Yvette France

The multi-user medium access mechanism OFDMA has to provide each node with a given amount of radio resources. In this paper we present a new distributed algorithm for the allocation of resource blocks in an OFDMA ad hoc network. We are principally interested in allocating resources fairly because the ad hoc networks which we work on are dedicated to be deployed in the areas of natural or man-made disasters and where the guarantee of connectivity is an important issue. Contrary to the commonly applied approach, we consider a resource allocation on the links under a two hop interference distance. The proposed allocation procedure is coupled with our other algorithm which detects and corrects two hop interferences and which has been revised and improved. The performance of our algorithm is evaluated by simulation for different topologies. We observed that simultaneous allocations in large networks allow a constant convergence time to be kept despite the networks size.

关键词： Resource management Peer to peer computing Topology Interference Transmitters Receivers Convergence

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Adaptive web-based systems: From framework to implementation 10

Adaptive web-based systems: From framework to implementation

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11th International Conference on computer systems and Technologies, CompSysTech'10

作者： Raufi, Bujar Georgieva, Juliana Faculty of Contemporary Sciences and Technologies Department of Computer Science South East European University Denmark Faculty of Computers and Control Systems Department of Programming and Computer Technologies Technical University of Sofia Bulgaria

ISBN: (纸本)9781450302432

The paper gives an insight of the work done so far in modelling and implementation of user adapted software systems or adaptive web sites. We introduce a five layer framework which gives to our adaptive web based system flexibility, expressiveness, modularity and interoperability. The work so far has been concentrated in the first four layers of the framework concerning data representation, representation of knowledge as well as development of adaptation algorithm for such systems. Initial experimental results on adaptation show good performance of the algorithm for both per-user based adaptation and adaptation for groups of users. The findings also indicate that the approach is suitable for generic adaptive web-based systems. Copyright. © 2010 ACM.

关键词： Websites

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Lecture Notes in Electrical Engineering: Preface

Lecture Notes in Electrical Engineering

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Lecture Notes in Electrical Engineering 2011年 74 LNEE卷 v-viii页

作者： Benner, Peter Hinze, Michael Ter Maten, E. Jan W. Max Planck Institute for Dynamics of Complex Technical Systems Sandtorstr. 1 39106 Magdeburg Germany Dept. Mathematik Universität Hamburg Bundesstr. 55 20146 Hamburg Germany Department of Mathematics and Computer Science Eindhoven University of Technology Den Dolech 2 HG 8.02 P.O. Box 513 5600 MB Eindhoven Netherlands

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Optimal design of Hold-Zero Control for networked control systems with control missing

Optimal design of Hold-Zero Control for networked control sy...

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IEEE International Symposium on computer Aided Control System Design (CACSD)

作者： Xu-Guang Li Wen-Juan Jiang Arben Çela Silviu-Iulian Niculescu School of Infonnation Science and Engineering Northeastern University Shenyang Liaoning China School of Computer Science and Technology Nantong University Nantong Jiangsu China ESIEE Paris Department of Embedded Systems UPE Noisy-Le-Grand France Laboratoire des Signaux et Systémes (L2S UMR CNRS 8506) CNRS-Supélec Gif-Sur-Yvette France

The admissible control missing rate (ACMR) of a sampled-data control system is an important index which reflects the stability robustness with respect to control missing in the network. In addition, ACMR can be used to design a hyper-period, by which system resource can be saved. In this paper, we propose a switched hold-zero (HZ) control as a control-missing compensator. The switched HZ control has two control modes: the hold-control one and the zero-control one. The switch between the two control modes is determined by a switching parameter. In order to obtain an ACMR as high as possible, we put forward a method to optimally design the switching parameter. It will be seen that the switched HZ control can lead to higher ACMR than that derived by the existing method.

关键词： Gold Optical reflection Optical switches

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