Recursos de colección

Universidad Nacional de La Plata (74.538 recursos)

Este servicio se brinda en el marco del Proyecto de Enlace de Bibliotecas (PrEBi) y significa una novedosa iniciativa en pos de la difusión a través de Internet, dentro y fuera del ámbito de la Universidad, de los conocimientos que en ella se generan para servir como vehículo de promoción y jerarquización. Los objetivos que se han planteados para SeDiCI son sumamente ambiciosos e incluyen la difusion electrónica de tesis, tesinas y disertaciones pero también de otros tipos de creaciones intelectuales, pretendiendo abarcar la ciencia, la tecnología y el arte buscando modos de presentación no solo de objetos en forma de documentos de texto sino también otros medios multimediales aptos para creaciones no documentales.

vol. 05, no. 04

Mostrando recursos 1 - 20 de 28

  1. Definition of a goal elicitation process

    Thomas, Pablo Javier
    Requirement Engineering plays an essential role at the initial stage in the software development life cycle. This discipline entails three processes: Requirements Elicitation, Specification and Validation. Elicitation has, as a primary goal, the knowledge acquisition over a problem domain. In order to do this, different techniques are applied according to the kind of information to be elicited and the time and resources available for the analyst. One of the most important techniques is Goal Analysis. It was established, once analysed the most important approaches as far as use is concerned (GBRAM, KAOS, Softgoals, Ideas, Rolland, Loucopoulos) that those approaches lack...

  2. Grid computing: A practical guide to technology and applications. Ahmar Abbas

    De Giusti, Armando Eduardo
    The book is useful as a comprehensive introduction, covering many application areas. Grid technology and its applications are clearly presented, but require some background on Operating Systems, Concurrent Programming and Communication Networks.

  3. A Framework for Deliberation and Negotiation among BDI Agents

    Rueda, Sonia Vivian; Martínez, María Vanina
    This work presents an interaction model among collaborative agents based on dialogues. For the specification we use a formalism, called Dialogue Games, which allows to describe the nature of the utterances available in each dialogue. We propose an interaction language which favors deliberation and argumentationbased negotiation among BDI agents. For each locution's specification we establish a set of preconditions, its meaning, the expected responses, and the modifications that it could produce. The interaction protocol and the interaction language as a whole can be used for specifying meaningful interaction between dialogical partners by following the rules of an individual dialogue.

  4. A proposal from the point of view of information visualization and human computer interaction for the visualization of distributed system load

    Larrea, Martín Leonardo; Martig, Sergio R.; Castro, Silvia Mabel; Echaiz, Javier
    In this article we show how the design of interfaces for the visualization of distributed system load can benefit from the combination of concepts and techniques from Information Visualization and Human Computer Interaction (HCI). Every distributed systems administrator must handle a high volume of information and the exploration and analysis of this data set has become increasingly difficult. We propose how to visualize the parameters involved in the load of a distributed system to obtain an effective visualization tool in order to reduce the user cognitive workload and help the user make the right decisions in a productive way.

  5. Learning object semantic description for enhancing reusability

    Señas, Perla; Moroni, Norma
    In the design of activities for Web-Based Education Systems, the concept of Didactic Object or Learning Object, has appeared as the axis of a new paradigm concerned with the reusability of contents and activities, due to its organization from a conceptual point of view, the use of metadata in known formats and the setting of new standards. In this article, the concept of reusability is analyzed within the context of the systems mentioned. In addition, Sowa-Style Conceptual Maps as well as Hypermedia Conceptual Maps are proposed as schemes capable of representing knowledge, since they allow for a clear visualization and...

  6. Requirement specifications for electronic voting systems

    Pesado, Patricia Mabel; Feierherd, Guillermo Eugenio; Pasini, Ariel C.
    This paper presents an analysis of the requirements specification in electronic voting systems. In particular, it poses a specification that assumes a physical distributed architecture model with two networked intelligent units (Voting Terminal and Authorities Terminal). State Transition Diagrams and Use Cases are used in the modeling of the requirements. Finally, the model adaptation to two classes of different elections is analyzed: a national election of closed daily cycle and a university election with a cycle of several days, both with multiple objectives.

  7. Security in process migration systems

    Echaiz, Javier; Ardenghi, Jorge Raúl
    A loosely coupled distributed system is composed by nodes, usually heterogenous, connected by a network. These systems have enormous aggregate computing potential. However most of this potential is not realized unless the underlying software is able to implement the concept of single system image (SSI) on the physically distributed system. This way the resources belonging to a node could be accessed transparently from any other node. This paper discusses the issues of a process migration protocol as an essential component of a distributed system and its extension to the grid computing paradigm. The security issues are specially considered.

  8. A parallel search algorithm for the SAT

    Gil Costa, Graciela Verónica; Printista, Alicia Marcela; Reyes, Nora Susana; Marin Cahiuan, Juan Mauricio
    In order to be able to perform multimedia searches (like sounds, videos, images, etc.) we have to use data structures like the Spatial Approximation Tree (SAT). This structure is a nice example of a tree structure in which well-known tricks for tree parallelization simply do not work. It is too sparse, unbalanced and its performance is too dependent on the work-load generated by the queries being solved by means of searching the tree. The complexity measure is given by the number of distances computed to retrieve those objects close enough to the query. In this paper we examine some alternatives...

  9. Verifying BON models with alloy

    Demasi, Ramiro Adrián; Ponzio, Pablo Daniel; Castro, Pablo Francisco; Baum, Gabriel Alfredo
    In this paper we describe a methodology to translate BON (architectural) designs to Alloy specifications. The main virtue of this process is that it can be implemented by means of software tools. The utilization of this methodology during the software development allows designers to validate different kinds of properties over their BON models. Allowing, in this way, the finding of critical bugs in earlier steps of system construction. Finally, we present a software which implements this translation from BON to Alloy.

  10. Evaluating simple metaheuristics for the generalized steiner problem

    Nesmachnow, Sergio
    This article presents the empirical evaluation of several simple metaheuristics applied to solve the Generalized Steiner Problem (GSP). This problem models the design of high-reliability communication networks, demanding a variable number of independent paths linking each pair of terminal nodes. GSP solutions are built using intermediate nodes for guaranteeing path redundancy, while trying to minimize the design total cost. The GSP is a NP-hard problem, and few algorithms have been proposed to solve it. In this work, we present the resolution of several GSP instances whose optimal solutions are known, using metaheuristic techniques. The comparative analysis shows promising results for...

  11. Applying ontologies to educational resources retrieval driven by cultural aspects

    Motz, Regina; Guzmán, Jacqueline; Deco, Claudia; Bender, Cristina
    This work presents the architecture used in the ongoing e-learning EduCa Project. The approach is based in a strong use of ontologies for the retrieval, management and clustered of electronic educational resources according to user's cultural aspects. Cultural aspects are preferences and ways of behavior determined by the person's culture. In this project, the cultural aspects are just the features that distinguish between the preferences of users from different regions.

  12. Dynamic load balancing in parallel processing on non-homogeneous clusters

    De Giusti, Armando Eduardo; Naiouf, Marcelo; De Giusti, Laura Cristina; Chichizola, Franco
    This paper analyzes the dynamic and static balancing of non-homogenous cluster architectures, simultaneously analyzing the theoretical parallel Speedup as well as the Speedup experimentally obtained. Three interconnected clusters have been used in which the machines within each cluster have homogeneous processors although different among clusters. Thus, the set can be seen as a 25-processor heterogeneous cluster or as a multi-cluster scheme with subsets of homogeneous processors. A classical application (Parallel N-Queens) with a parallel solution algorithm, where processing predominates upon communication, has been chosen so as to go deep in the load balancing aspects (dynamic or static) without distortion of...

  13. Adaptive clustering with artificial ants

    Ingaramo, Diego Alejandro; Leguizamón, Mario Guillermo; Errecalde, Marcelo Luis
    Clustering task aims at the unsupervised classification of patterns (e.g., observations, data, vec- tors, etc.) in different groups. Clustering problem has been approached from different disciplines during the last years. Although have been proposed different alternatives to cope with clustering, there also exists an interesting and novel field of research from which different bioinspired algorithms have emerged, e.g., genetic algorithms and ant colony algorithms. In this article we pro- pose an extension of the AntTree algorithm, an example of an algorithm recently proposed for a data mining task which is designed following the principle of self-assembling behavior observed in some...

  14. Cellular memetic algorithms

    Alba Torres, Enrique; Dorronsoro, Bernabé; Alfonso, Hugo
    This work is focussed on the development and analysis of a new class of algorithms, called cellular memetic algorithms (cMAs), which will be evaluated here on the satisfiability problem (SAT). For describing a cMA, we study the effects of adding specific knowledge of the problem to the fitness function, the crossover and mutation operators, and to the local search step in a canonical cellular genetic algorithm (cGA). Hence, the proposed cMAs are the result of including these hybridization techniques in different structural ways into a canonical cGA. We conclude that the performance of the cGA is largely improved by these...

  15. Towards a UML profile for modeling WAP applications

    Soto De Giogis, Ricardo; Cámara Joui, Mauricio
    UML (Unified Modeling Language) is one of the most used languages to specify and document informatics applications. However, UML is a generalpurpose language, so it often lacks of elements to model and represent concrete concepts of specifics domains. As a solution, OMG (Object Management Group) has created the profiles, a mechanism to extend the syntax and semantics of UML to express more specific concepts of certain application domains. In this work we present a UML profile for modeling WAP (Wireless Applications Protocol) applications. The main goal of the proposed profile is to extend UML to provide specifics elements (labeled classes,...

  16. Wildland fire risk maps using S2F2M*

    BIanchini, Germán; Cortés, Ana; Margalef, Tomás; Luque Fadón, Emilio; Chuvieco, Emilio; Camia, Andrea
    Wildland fires are a critical natural hazard in many regions of the World. Every year, millions of hectares are burned in Tropical, Boreal and Mediterranean forest, which causes a wide variety of effects, from atmospheric emissions, to soil erosion, biodiversity loss and drainage alterations. Reduction of those negative effects of fire requires to improve current fire risk assessment methods. Wildland firerisk assessment is a very significant issue. This risk assessment is usually based on ignition probability due to meteorological or human factors, but it does not usually consider propagation danger when a wildland fire has started. To evaluate propagation danger,...

  17. Analysis of web based learning use in a first course of algorithmics

    Madoz, María Cristina; Gorga, Gladys; De Giusti, Armando Eduardo
    This paper presents an analysis of the aspects to take into account when reformulating the teaching and learning processes of a first course of Algorithmics employing elements of Distance Education in a Web-based virtual environment. Particularly it analyzes a large experience (more than 1000 students) carried out in the initial subject of Algorithmics (Computer Programming, annual subject), of the School of Computer Sciences at the UNLP, on three different student's profiles. In addition, this paper discusses the difficulties of distance education on subjects with an important experimental component, such as the analyzed first course of Algorithmics. Finally, the results obtained...

  18. Processing interaction protocols in parallel: a logic programming implementation for robotic soccer

    Tucat, Mariano; García, Alejandro Javier
    In this paper we explore different situations in which collaborative agents have to communicate among themselves using standard interaction protocols. We will propose how to process these interactions in parallel without interfering with other agent's activities. Thus, agents will not have to interrupt or delay an activity for handling incoming messages, and in some cases, answers can be created and delivered immediately. Our proposal will be oriented to a robotic soccer domain with autonomous mobile robots. We will analyze three kinds of situations in which the interaction between agents plays an important role for coordination: requirements, queries and proposals. Requirements...

  19. The multi-agent system architecture in SEWASIE

    Fillottrani, Pablo Rubén
    We describe the design, implementation and deployment of the multi-level agent-based system architecture developed for the SEWASIE project. The aim of the system is to help the user in querying heterogeneous data sources which are integrated by means of ontologies. The agent architecture is based on a two level data integration scheme supported by mediators and brokers, connected by a peer to peer mechanism. Implementation is done on top of the JADE system, a modular and scalable platform that satisfies FIPA standards.

  20. Semi-automatic object tracking in video sequences

    Lecumberry, Federico; Pardo, Álvaro
    A method is presented for semi-automatic object tracking in video sequences using multiple features and a method for probabilistic relaxation to improve the tracking results producing smooth and accurate tracked borders. Starting from a given initial position of the object in the first frame the proposed method automatically tracks the object in the sequence modelling the a posteriori probabilities of a set of features such as color, position and motion, depth, etc.

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