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Grammar-Based Automatic Extraction of Definitions

Grammar-Based Automatic Extraction of Definitions

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international symposium on symbolic and numeric algorithms for scientific computing (SYNASC)

作者： Adrian Iftene Ionut Pistol Diana Trandabat Faculty of Computer Science Alexandru Ioan Cuza슠University Iasi Romania

the paper describes the development and usage of a grammar developed to extract definitions from documents. One of the most important practical usages of the developed grammar is the automatic extraction of definitions from web documents. three evaluation scenarios were run, the results of these experiments being the main focus of the paper. One scenario uses an e-learning context and previously annotated e-learning documents; the second one involves a large collection of unannotated documents (from Wikipedia) and tries to find answers for definition type questions. the third scenario performs a similar question-answering task, but this time on the entire web using Google web search and the Google Translation Service. the results are convincing, further development as well as further integration of the definition extraction system in various related applications are already under way.

关键词： Electronic learning Web search Dictionaries Data mining scientific computing Computer science Wikipedia Buildings Semantic Web Computational linguistics

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Undecidability Results for Finite Interactive Systems

Undecidability Results for Finite Interactive Systems

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international symposium on symbolic and numeric algorithms for scientific computing (SYNASC)

作者： Alexandru Sofronia Alexandru Popa Gheorghe Stefanescu Department of Computer Science University of Bucharest Bucharest Romania Department of Computer Science University of Bristol Bristol UK Department of Computer Science University of Illinois Urbana-Champaign Urbana IL USA

this paper is on the foundations of a recent approach to the design of massively parallel and interactive programming languages using rv-systems (interactive systems with registers and voices) and Agapia programming. It includes a few theoretical results on FISs (finite interactive systems), the underlying mechanism used for specifying control and interaction in these systems. First, we give a proof for the undecidability of the emptiness problem for FISs by reduction to the post correspondence problem. Next, we use the proof to get other undecidability results, e.g., for the accessibility of a transition in a FIS, or for the finiteness of the language recognized by a FIS. Finally, we present a simple proof of the equivalence between FISs and tile systems, making explicit that they precisely capture recognizable two-dimensional languages.

关键词： Interactive systems Computer languages Computer science Tiles Control systems scientific computing Algorithm design and analysis Parallel programming Arithmetic Functional programming

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UML Model Refactoring as Refinement: A Coalgebraic Perspective

UML Model Refactoring as Refinement: A Coalgebraic Perspecti...

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international symposium on symbolic and numeric algorithms for scientific computing (SYNASC)

作者： Luis Soares Barbosa Sun Meng DI-CCTC Minho University Braga Portugal CWI Amsterdam Netherlands

Although increasingly popular, Model Driven Architecture (MDA)still lacks suitable formal foundations on top of which rigorousmethodologies for the description, analysis and transformation ofmodels could be built. this paper aims to contribute in thisdirection: building on previous work by the authors on coalgebraicrefinement for software components and architectures, it discussesrefactoring of models within a coalgebraic semantic framework. Architectures are defined through aggregation based on a coalgebraic semantics for (subsets of)UML. On the other hand, such aggregations, no matter how large and complex they are, can always be dealt with ascoalgebras themselves. this paves the way to a discipline ofmodels' transformations which, being invariant under either behavioural equivalenceor refinement, are able to formally capture a large number of refactoring patterns. the main ideas underlying this research are presented through a detailed example in the context of refactoring of UML class diagrams.

关键词： Unified modeling language Computer architecture Software systems Programming scientific computing Sun Algorithm design and analysis Buildings Software engineering Concrete

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Supply Chain Risk Management by Mining Business Dependencies

Supply Chain Risk Management by Mining Business Dependencies

引用

international symposium on symbolic and numeric algorithms for scientific computing (SYNASC)

作者： Lucian Hancu Soft ProEuro s. r. l Cluj-Napoca Romania

Current supply chain risk management techniques rely on the integration of the business information systems of the entities forming the supply chain. the method is well-suited for small and medium entities, but large Entities are rather reticent in integrating Information Systems with the ones of SMEs. this article presents a risk-reduction mechanism based on mining Business Dependencies that were previously automatically discovered from the Web logs of our multi-server search application. the material gathered in the previous experiments (business dependencies inferred from Web usage logs and information on entities) serves as a support for building Virtualized Supply Chains. the generation of the Virtualized Supply Chains and the computation of the associated risks conduct to the derivation of a risk reduction technique, which can be later applied in the redesign of Supply Chains and replace suppliers having high risk measures with those exhibiting lower risk measures.

关键词： Supply chains Risk management Business Radiofrequency identification Management information systems Supply chain management Web search Companies Floods scientific computing

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A (Timed) State-Transition Semantics for Reflective Petri Nets

A (Timed) State-Transition Semantics for Reflective Petri Ne...

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international symposium on symbolic and numeric algorithms for scientific computing (SYNASC)

作者： Lorenzo Capra Department of Informatics and Communication University degli Studi Milan Italy

the design of dynamic (adaptable) discrete-event systems calls for adequate modeling formalisms and tools able to manage possible changes occurring during systempsilas lifecycle. A common approach is to pollute design with details that do not regard the current system behavior, rather its evolution. that hampers analysis, reuse and maintenance in general. A Petri net-based reflective model (based on classical Petri nets) was recently proposed to support dynamic discrete-event systempsilas design, and was applied to dynamic workflowpsilas management. Behind there is the idea that keeping functional aspects separated from evolutionary ones, and applying evolution to the (current) system only when necessary, results in a simple formal model on which the ability of verifying properties typical of Petri nets is preserved. On the perspective of implementing in the short time a discrete-event simulation engine, Reflective Petri nets are provided in this paper with a timed state-transition graph semantics, defined in terms of a Markov process.

关键词： Petri nets Discrete event systems Timing Pollution Discrete event simulation Engines Markov processes Performance analysis Stochastic processes scientific computing

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Towards Validating Prediction Systems for Process Understandability: Measuring Process Understandability

Towards Validating Prediction Systems for Process Understand...

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international symposium on symbolic and numeric algorithms for scientific computing (SYNASC)

作者： Joachim Melcher Detlef Seese Institut AIFB Universität Karlsruhe Karlsruhe Germany

Motivated by software metrics, several process metrics for measuring internal (structural) process attributes have been proposed. Integrated in validated prediction systems, these metrics can be used to predict values of external process attributes like, for example, process understandability. there are only a few papers dealing with finding a process understandability metric and validating prediction systems for process understandability. Looking at these publications, we identified possible problems with metric reliability and validity. In this paper, we define new metrics for process understandability inspired by existing work. Furthermore, we present some hypotheses about effects of measuring process understandability. Conducting an experiment, we got some encouraging findings supporting these hypotheses: different aspects of process understandability can be complicated in varying degrees for a process and asking only some few questions about a process can cause values for process understandability differing very much from the real value. these findings should be considered in future work about measuring process understandability.

关键词： Software measurement Software metrics Humans Software algorithms scientific computing Costs Time measurement Process design Design for experiments Concrete

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Hardware Implementation of P Systems Using Microcontrollers. An Operating Environment for Implementing a Partially Parallel Distributed Architecture

Hardware Implementation of P Systems Using Microcontrollers....

引用

international symposium on symbolic and numeric algorithms for scientific computing (SYNASC)

作者： Sandra Maria Gomez Canaval Abraham Gutierrez Rodriguez Santiago Alonso Villaverde Natural Computing Group Universidad Politecnica de Madrid Madrid Spain

Nowadays, important efforts in the research of the Transition P Systems have been focused on the simulation/implementation of the massively parallel character ofthe model. the distributed implementation of P Systems hasmet with the communications bottleneck problem. In thissense, there are several research works on analysis for distributed architectures that are technology independent and avoiding communication collisions. Recent works presentanalysis on the suitability for implementing theses architectures using an universal membrane hardware/software component based on microcontrollers. these implementations are directly programming on hardware components and the resulting data is analyzed by means of a specific program which translates the execution bit code into intelligible data for researchers. the aim of this work is to present an operating environment to automate manual tasks performed during the loading, execution and interpretation of P System into distributed architectures based on microcontrollers as well as the interpretation from inner binary data representation inside of microcontrollers.

关键词： Hardware Microcontrollers Biomembranes Computer architecture Independent component analysis Biological system modeling Power system modeling Evolution (biology) Network topology scientific computing

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Decentralized Dynamic Resource Allocation for Workflows in Grid Environments

Decentralized Dynamic Resource Allocation for Workflows in G...

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international symposium on symbolic and numeric algorithms for scientific computing (SYNASC)

作者： Florin Pop Ciprian Dobre Valentin Cristea Faculty of Automatics and Computer Science University Politehnica of Bucharest Romania

In this paper we present an innovative decentralized dynamic resource scheduling solution of large scale application workflows onto distributed, heterogeneous grid environments. the presented resource allocation solution aims to optimize large-scale scientific application workflows by efficiently and effectively mapping and scheduling them onto grid resources. the proposed solution is part of a framework that aims to help scientists easily deploy large-scale scientific workflow applications from a wide-range of research fields. the decentralized architecture, together with the scheduling policies and fault management being proposed in this paper, are specifically designed to optimize the scheduling management for workflows in case of a wide range of grid environment. In order to demonstrate the validity and performance of the presented scheduling solution we propose using modeling and simulation techniques. For that we present the characteristics of a generic simulator that includes all the necessary components to help in evaluating a wide-range of scheduling procedures, such as the ones presented in this, in the context of large-scale heterogeneous grid environment.

关键词： Resource management Processor scheduling Large-scale systems Dynamic scheduling Scheduling algorithm Application software Environmental management Computational modeling Context modeling Grid computing

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Data Compression on Multisets. Submultiset-Free Codes

Data Compression on Multisets. Submultiset-Free Codes

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international symposium on symbolic and numeric algorithms for scientific computing (SYNASC)

作者： Cosmin Bonchis Gabriel Ciobanu Graiela Ghergu Cornel Izbasa Research Institute e-Austria Timişoara Romania Faculty of Computer Science West University Timişoara Romania Faculty of Computer Science West University Timişoara Timisoara Romania Institute of Computer Science Alexandru Ioan Cuza슠University Iasi Romania Faculty of Computer Science and Romanian Academy Institute of Computer Science Işi Romania

Regular data compression converts a sequence of symbols into a sequence of strings (descriptions), assigning the shortest descriptions to the most frequent symbols produced by the data source. By contrast, here we consider the compression of a sequence of symbols to a sequence of multisets. this is relevant if the communication channel does not preserve order (positioning) of the transmitted letters, as is the case in many biological contexts; for example, if you regard the passage of a multiset of molecules through a blood vessel as an information transfer. We introduce the concept of submultiset-free codes, a counterpart to the existing concept of prefix-free codes. We derive a theorem about the structure of optimal submultiset codes for uniform random variables and we describe an algorithm for constructing them.

关键词： Data compression Random variables Computer science Decoding Biological information theory Context Blood vessels Cells (biology) scientific computing Communication channels

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iComponent: A Platform Independent Component Model for Dynamic Execution Environments

iComponent: A Platform Independent Component Model for Dynam...

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international symposium on symbolic and numeric algorithms for scientific computing (SYNASC)

作者： Ioan Lazar Bazil Parv Simona Motogna Istvan Gergely Czibula Codrut-Lucian Lazar Department of Computer Science Babeş-Bolyai University Cluj-Napoca Romania

Service-oriented component models support the dynamic availability of components at run-time and offer the possibility to build dynamically adaptable applications. However, building service-oriented components is a complex task due to the complexity of service-oriented frameworks. In this context today frameworks try to simplify the component development by allowing developers to concentrate only on implementing the business logic of the component and then to configure declaratively the component deployment. In this paper we present a platform-independent component model, iCOMPONENT, which provides these features. We also define a UML profile for constructing components as UML models according to the OMG's model driven architecture. this work is part of a series refering to COMDEVALCO - a framework for software component definition, validation, and composition. As part of COMDEVALCO framework we present a tool for executing UML components expressed in terms of the proposed component model.

关键词： Application software Business Java Integrated circuit modeling Availability Unified modeling language Runtime environment Logic programming scientific computing Computer science

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