ppxscal/embedding_network huggingface dataset:
A hybrid P2P communications architecture for zonal MMOGs
Authors: Dewan Tanvir Ahmed, Shervin Shirmohammadi, Jauvane C. Oliveira
Venue: Multimedia Tools and Applications (2009)

Distributed Virtual Environments are becoming more popular in today's computing and communications among people. Perhaps the most widely used form of such environments is Massively Multiplayer Online Games (MMOG), which are in the form of client/server architecture that requires considerable server resources to manage a large number of distributed players. Peer-to-peer communication can achieve scalability at lower cost but may introduce other difficulties. Synchronous communication is a prime concern for multi-user collaborative applications like MMOGs where players need frequently interaction with each other to share their game states. In this article, we present a hybrid MMOG architecture called MM-VISA (Massively Multiuser VIrtual Simulation Architecture). In this architecture, servers and peers are coupled together to take the inherent advantages of the centralized architecture and the scalability of distributed systems. As the virtual world is decomposed into smaller manageable zones, the players' random movement causes reorganization at the P2P overlay structure. The frequent nature of movements along with unintelligent zone crossing approaches, currently implemented in MMOGs, breaks synchronous communication. To limit such problem, we consider players' gaming characteristics to intelligently define routing paths. A graph-theoretic framework is incorporated for overlay oriented real-time distributed virtual environments. We shall show that interest-driven zone crossing, dynamic shared region between adjacent zones, and clustering of entities based on their attributes significantly decrease unstable overlay situations. The effectiveness of the presented system is justified through simulation.
The Google Way: How One Company is Revolutionizing Management As We Know It
Authors: Bernard Girard
Venue:  (2009)

Shortly after World War I, Ford and GM created the large modern corporation, with its financial and statistical controls, mass production, and assembly lines. In the 1980s, Toyota stood out for combining quality with continuous refinement. Today, Google is reinventing business yet again-the way we work, how organizations are controlled, and how employees are managed. Management consultant Bernard Girard has been analyzing Google since its founding in 1998, and now in The Google Way, he explores Google's innovations in depth-many of which are far removed from the best practices taught at the top business schools. As you read, you'll see how much of Google's success is due to its focus on users and automation. You'll also learn how eCommerce has profoundly changed the relationship between businesses and their customers, for the first time giving customers an important role to play in a major corporation's growth. Finally, Girard speculates about the limits of Google's business model and discusses the challenges it will face as it continues to grow. Google's culture is one of innovation. Why not make that spirit of innovation your own? The ACM Portal is published by the Association for Computing Machinery. Copyright © 2010 ACM, Inc. Terms of Usage Privacy Policy Code of Ethics Contact Us Useful downloads: Adobe Acrobat QuickTime Windows Media Player Real Player
Integrating Autopoiesis and Behavior: An Exploration in Computational Chemo-ethology
Authors: Matthew D. Egbert, Ezequiel Di Paolo
Venue: Adaptive Behavior - Animals, Animats, Software Agents, Robots, Adaptive Systems (2009)

It has been argued that the difference between an autonomous entity and an agent is in the ability of the latter to perform behaviors supplemental to processes of self-maintenance (autopoiesis). Theories have been proposed concerning how such behaviors might relate to autopoiesis, but so far, computational models of autopoiesis have paid little attention to these relations. In this article we present a new model designed to explore the relationship between mechanisms of autopoiesis and behavior. We report on three clarifications of the theory provided by the model: (a) mechanisms of behavior can be related to mechanisms of autopoiesis while remaining operationally distinct, (b) the organization of an operationally closed system can change over time while remaining operationally closed, and (c) behavior modulation based upon autopoietic efficacy has limitations that can be avoided through the use of a partially decoupled behavioral system. Finally, we discuss questions that have surfaced during examination of the model.
CAMEL: A Tool for Collaborative Distributed Software Design
Authors: Marcelo Cataldo, Charles Shelton, Yongjoon Choi, Yun-Yin Huang, Vytesh Ramesh, Darpan Saini, Liang-Yun Wang
Venue: Proceedings of the 2009 Fourth IEEE International Conference on Global Software Engineering (2009)

Software design activities require rich communication channels where developers can exchange information in multiple ways. It is well established that geographic distribution impacts negatively on the effectiveness of design meetings. In this paper, we present a tool for supporting virtual software design meetings. The features of the tool address four fundamental challenges identified from the literature: (1) information sharing, conflict resolution and development of consensus among geographically distributed designers, (2) availability of sufficient and organizable drawing surfaces for graphical representations, (3) developing shared understanding and managing focus during the discussion and (4) appropriate capturing and storing of all design-relevant information.
Model a Discourse and Transform It to Your User Interface
Authors: Hermann Kaindl
Venue: Proceedings of the 12th IFIP TC 13 International Conference on Human-Computer Interaction: Part II (2009)

Every interactive system needs a user interface, today possibly even several ones adapted for different devices (PCs, PDAs, mobile phones). Developing a user interface is difficult and takes a lot of effort, since it normally requires design and implementation. This is also expensive, and even more so for several user interfaces for different devices.This tutorial shows how human-computer interaction can be based on discourse modeling, even without employing speech or natural language. Our discourse models are derived from results of Human Communication theories, Cognitive Science and Sociology. Such discourse models can specify an interaction design. This tutorial also demonstrates how such an interaction design can be used for model-driven generation of user interfaces and linking them to the application logic and the domain of discourse.
A Consistency-Based Secure Localization Scheme against Wormhole Attacks in WSNs
Authors: Honglong Chen, Wei Lou, Zhi Wang
Venue: Proceedings of the 4th International Conference on Wireless Algorithms, Systems, and Applications (2009)

Wormhole attacks can negatively affect the localization in wireless sensor networks. A typical wormhole attack can be launched by two colluding external attackers, one of which sniffs packets at one point in the network, tunnels them through a wired or wireless link to another point, and the other of which relays them within its vicinity. In this paper, we investigate the impact of the wormhole attack on the localization process and propose a novel consistency-based secure localization scheme against wormhole attacks, which includes wormhole attack detection, valid locators identification and self-localization. We also conduct the simulations to demonstrate the effectiveness of our proposed scheme.
Reengineering a domain-independent framework for spoken dialogue systems
Authors: Filipe M. Martins, Ana Mendes, Márcio Viveiros, Joana Paulo Pardal, Pedro Arez, Nuno J. Mamede, João Paulo Neto
Venue: Software Engineering, Testing, and Quality Assurance for Natural Language Processing (2008)

Our work in this area started as a research project but when L2F joined TecnoVoz, a Portuguese national consortium including Academia and Industry partners, our focus shifted to real-time professional solutions. The integration of our domain-independent Spoken Dialogue System (SDS) framework into commercial products led to a major reengineering process. This paper describes the changes that the framework went through and that deeply affected its entire architecture. The communication core was enhanced, the modules interfaces were redefined for an easier integration, the SDS deployment process was optimized and the framework robustness was improved. The work was done according to software engineering guidelines and making use of design patterns.
Towards Algorithmic Generation of Business Processes: From Business Step Dependencies to Process Algebra Expressions
Authors: Márcio K. Oikawa, João E. Ferreira, Simon Malkowski, Calton Pu
Venue: Proceedings of the 7th International Conference on Business Process Management (2009)

Recently, a lot of work has been done on formalization of business process specification, in particular, using Petri nets and process algebra. However, these efforts usually do not explicitly address complex business process development, which necessitates the specification, coordination, and synchronization of a large number of business steps. It is imperative that these atomic tasks are associated correctly and monitored for countless dependencies. Moreover, as these business processes grow, they become critically reliant on a large number of split and merge points, which additionally increases modeling complexity. Therefore, one of the central challenges in complex business process modeling is the composition of dependent business steps. We address this challenge and introduce a formally correct method for automated composition of algebraic expressions in complex business process modeling based on acyclic directed graph reductions. We show that our method generates an equivalent algebraic expression from an appropriate acyclic directed graph if the graph is well-formed and series-parallel. Additionally, we encapsulate the reductions in an algorithm that transforms business step dependencies described by users into digraphs, recognizes structural conflicts, identifies Wheatstone bridges, and finally generates algebraic expressions.
Quantitative Improvements in cDNA Microarray Spot Segmentation
Authors: Mónica G. Larese, Juan Carlos Gómez
Venue: Proceedings of the 4th Brazilian Symposium on Bioinformatics: Advances in Bioinformatics and Computational Biology (2009)

When developing a cDNA microarray experiment, the segmentation of individual spots is a crucial stage. Spot intensity measurements and gene expression ratios directly depend on the effectiveness and accuracy of the segmentation results. However, since the ground truth is unknown in microarray experiments, quantification of the accuracy of the segmentation process is a very difficult task. In this paper an improved unsupervised technique based on the combination of clustering algorithms and Markov Random Fields (MRF) is proposed to separate the foreground and background intensity signals used in the spot ratio computation. The segmentation algorithm uses one of two alternative methods to provide for initialization, namely K-means and Gaussian Mixture Models (GMM) clustering. This initial segmentation is then processed via MRF. Accuracy is measured by means of a set of microarray images containing spike spots where the target ratios are known a priori, thus making it possible to quantify the expression ratio errors. Results show improvements over state-of-the-art procedures.
Data-driven semantic analysis for multilingual WSD and lexical selection in translation
Authors: Marianna Apidianaki
Venue: Proceedings of the 12th Conference of the European Chapter of the Association for Computational Linguistics (2009)

A common way of describing the senses of ambiguous words in multilingual Word Sense Disambiguation (WSD) is by reference to their translation equivalents in another language. The theoretical soundness of the senses induced in this way can, however, be doubted. This type of cross-lingual sense identification has implications for multilingual WSD and MT evaluation as well. In this article, we first present some arguments in favour of a more thorough analysis of the semantic information that may be induced by the equivalents of ambiguous words found in parallel corpora. Then, we present an unsupervised WSD method and a lexical selection method that exploit the results of a data-driven sense induction method. Finally, we show how this automatically acquired information can be exploited for a multilingual WSD and MT evaluation more sensitive to lexical semantics.
A Preliminary Usability Evaluation of Hemo@Care: A Web-Based Application for Managing Clinical Information in Hemophilia Care
Authors: Vasco Saavedra, Leonor Teixeira, Carlos Ferreira, Beatriz Sousa Santos
Venue: Proceedings of the 1st International Conference on Human Centered Design: Held as Part of HCI International 2009 (2009)

In this work, an overall description of the methods used and the results obtained in the on-going evaluation of hemo@care is presented. To help understanding the methods and results, we first give an overview of the main functionalities of hemo@care, which is a web application to manage the clinical information in hemophilia care, developed to be used by hematologists, nursing staff and patients suffering from hemophilia. Following we described the methods used in this particular evaluation, and finally we present the main results and general conclusions of these preliminary usability evaluation.
A comparison of two different approaches to morphological analysis of Dutch
Authors: Guy De Pauw, Tom Laureys, Walter Daelemans, Hugo Van hamme
Venue: Proceedings of the 7th Meeting of the ACL Special Interest Group in Computational Phonology: Current Themes in Computational Phonology and Morphology (2004)

This paper compares two systems for computational morphological analysis of Dutch. Both systems have been independently designed as separate modules in the context of the FLa-VoR project, which aims to develop a modular architecture for automatic speech recognition. The systems are trained and tested on the same Dutch morphological database (CELEX), and can thus be objectively compared as morphological analyzers in their own right.
Generating parametric models of tubes from laser scans
Authors: Ulrich Bauer, Konrad Polthier
Venue: Computer-Aided Design (2009)

We present an automatic method for computing an accurate parametric model of a piecewise defined pipe surface, consisting of cylinder and torus segments, from an unorganized point set. Our main contributions are reconstruction of the spine curve of a pipe surface from surface samples, and approximation of the spine curve by G^1 continuous circular arcs and line segments. Our algorithm accurately outputs the parametric data required for bending machines to create the reconstructed tube.
The Design and Research of Multimedia Courseware for Self-Control Learning
Authors: Li Yuncheng
Venue: Proceedings of the 2009 International Forum on Information Technology and Applications - Volume 03 (2009)

Aimed at project Instructional Courseware Design Using Geometrical Painting Method which is an sample of multimedia courseware, an suggestion was made that design should be directed by appropriate teaching and learning theory, bring forth all materials to learner through appropriate technology, making the learner to be able to join into the whole process of learning, to practice all the related technique in time, so that the learner could to be learned soon. Through this process, the learner not only could learn the knowledge it self, but also the method to solve problems in the real world
XRCE-M: a hybrid system for named entity metonymy resolution
Authors: Caroline Brun, Maud Ehrmann, Guillaume Jacquet
Venue: Proceedings of the 4th International Workshop on Semantic Evaluations (2007)

This paper describes our participation to the Metonymy resolution at SemEval 2007 (task #8). In order to perform named entity metonymy resolution, we developed a hybrid system based on a robust parser that extracts deep syntactic relations combined with a non-supervised distributional approach, also relying on the relations extracted by the parser.
Enabling intelligent content discovery on the mobile internet
Authors: Barry Smyth, Paul Cotter, Stephen Oman
Venue: Proceedings of the 19th national conference on Innovative applications of artificial intelligence - Volume 2 (2007)

The mobile Internet is a massive opportunity for mobile operators and content providers, but despite significant improvements in handsets, infrastructure, content, and charging models, mobile users are still struggling to access and locate relevant content and services. The core of this so-called content discovery problem is the navigation effort that users must invest in browsing and searching for mobile content. In this paper we describe one successfully deployed solution, which uses personalization technology to profile subscriber interests in order to automatically adapt mobile portals to their learned preferences. We present summary results, from our deployment experiences with more than 40 mobile operators and millions of subscribers around the world, which demonstrate how this solution can have a significant impact on portal usability, subscriber usage, and mobile operator revenues.
LP structures on type lattices and some refactoring problems
Authors: S. D. Makhortov
Venue: Programming and Computing Software (2009)

Lattice-based algebraic structures containing semantics of production-logic inference on a type hierarchy in an object-oriented system with an additional relation are introduced. Specific features of these structures, such as closedness, possibility of equivalent transformations, existence of logical reduction, are studied. It is shown how to apply the model developed to verification and optimization of type hierarchies. An important direction of the optimization is automatic elimination of code duplication by "pulling up" common attributes in the type hierarchy. Implementation issues are briefly discussed.
Wirelessly Pickpocketing a Mifare Classic Card
Authors: Flavio D. Garcia, Peter van Rossum, Roel Verdult, Ronny Wichers Schreur
Venue: Proceedings of the 2009 30th IEEE Symposium on Security and Privacy (2009)

The Mifare Classic is the most widely used contactless smartcard on the market.The stream cipher CRYPTO1 used by the Classic has recently been reverse engineered and serious attacks have been proposed. The most serious of them retrieves a secret key in under a second. In order to clone a card, previously proposed attacks require that the adversary either has access to an eavesdropped communication session or executes a message-by-message man-in-the-middle attack between the victim and a legitimate reader. Although this is already disastrous from a cryptographic point of view, system integrators maintain that these attacks cannot be performed undetected.This paper proposes four attacks that can be executed by an adversary having only wireless access to just a card (and not to a legitimate reader). The most serious of them recovers a secret key in less than a second on ordinary hardware. Besides the cryptographic weaknesses, we exploit other weaknesses in the protocol stack. A vulnerability in the computation of parity bits allows an adversary to establish a side channel. Another vulnerability regarding nested authentications provides enough plaintext for a speedy known-plaintext attack.
Objective Quality Assessment Measurement for Typhoon Cloud Image Enhancement
Authors: Changjiang Zhang, Juan Lu, Jinshan Wang
Venue: Proceedings of the 15th International Conference on Image Analysis and Processing (2009)

There are kinds of enhancement methods for satellite image, however, visual quality of them are basically assessed by human eyes. This can result in wrong identification. This will result in wrong prediction for center and intensity of the typhoon. It is necessary to find an objective measure to evaluate the visual quality for enhanced typhoon cloud image. In order to solve this problem, we give an objective assessment measurement based on information, contrast and peak-signal-noise-ratio. We design an experiment to certify the proposed measure by using the typhoon cloud images which are provided by China Meteorological Administration, China National Satellite Meteorological Center.
Deciding branching time properties for asynchronous programs
Authors: Rohit Chadha, Mahesh Viswanathan
Venue: Theoretical Computer Science (2009)

Asynchronous programming is a paradigm that supports asynchronous function calls in addition to synchronous function calls. Programs in such a setting can be modeled by automata with counters that keep track of the number of pending asynchronous calls for each function, as well as a call stack for synchronous recursive computation. These programs have the restriction that an asynchronous call is processed only when the call stack is empty. The decidability of the control state reachability problem for such systems was recently established. In this paper, we consider the problems of checking other branching time properties for such systems. Specifically we consider the following problems - termination, which asks if there is an infinite (non-terminating) computation exhibited by the system; control state maintainability, which asks if there is a maximal execution of the system, where all the state visited lie in some ''good'' set; whether the system can be simulated by a given finite state system; and whether the system can simulate a given finite state system. We present decision algorithms for all these problems.
Aged Leachate Treatment by Sequencing Aged Refuse Bioreactors
Authors: Yingjie Sun, Jing Liu, Jing Song, Youcai Zhao
Venue: Proceedings of the 2009 International Conference on Environmental Science and Information Application Technology - Volume 03 (2009)

In this study, the aged refuse excavated from a 10-year old closed landfill compartment at Shanghai Laogang Refuse Landfill was used as the substrate in a sequencing aged refuse bioreactor process for treatment of aged landfill leachate which sampled from the same landfill. Typically, screened aged refuse with a diameter less than 8mm was used as biofiltration material in the two round shaped bioreactor with an inner diameter of 40 cm and a height of 130 cm. Influent aged leachate with initial CODCr, TN and NH3-N concentrations of 2050-2530, 1920-2710 and 1800-2500 mg/L, respectively, was introduced into the system. The corresponding concentrations in the effluent were reduced to below 400-600, 400-750, and below 15 mg/L, respectively. The sequencing aged refuse process is not effective in TN and COD removal for aged leachate treatment. It may mainly due to its low biodegradable and shortage of valid carbon source. The treatment mechanism of nitrogen removal was studied. In the process, the nitrogen removal is mainly due to the nitrate denitrification in the anoxic bioreactor, simultaneous nitrification and denitrification is exist in the aerobic bioreactor, but is not the main nitrogen removal way, which is different from the nitrogen removal mechanism of fresh leachate treatment.