Recursos de colección

Universidad Nacional de La Plata (75.687 recursos)

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vol. 03, no. 02

Mostrando recursos 1 - 13 de 13

  1. A high-level perception architecture: real-time visual navigation for autonomous robots in structured environments

    López de Teruel Alcolea, Pedro E.
    This thesis describes the design and implementation of a mobile robot which is able to perform a structural interpretation of indoor environments, using only visual and proprioceptive sensory information. The desired behaviour is real-time navigation based on this interpretation, instead of a reactive approach. The design is guided by a predictive criterion: the system must anticipate the consequences of its actions, showing a certain predictive understanding of the scene in which it moves.

  2. Practical software measurement. Objective information for decision makers

    Ramón, Hugo Dionisio
    The authors present the Measurement Information Model and the Measurement Process Model, as well as guidelines based on their experience in order to apply these models to specific projects.

  3. An ontology approach to data integration

    Buccella, Agustina; Cechich, Alejandra; Rodríguez Brisaboa, Nieves
    The term Federated Databases refers to the data integration of distributed, autonomous and heterogeneous databases. However, a federation can also include information systems, not only databases. At integrating data, several issues must be addressed. Here, we focus on the problem of heterogeneity, more specifically on semantic heterogeneity that is, problems rela ted to semantically equivalent concepts or semantically related/unrelated concepts. In order to address this problem, we apply the idea of ontologies as a tool for data integration. In this paper, we explain this concept and we briefly describe a method for constructing an ontology by using a hybrid ontology...

  4. Shorter table ATA evaluation of elementary functions in single precision

    Bria, Oscar N.
    In this paper a slightly modification is proposed to the original Wong and Gotos ATA method for the computation of elementary functions in IEEE 754 single precision. The identification of a trade-off leads to the proposition of a different chunk of the mantissa that in turn brings a reduction in the length of the tables. Results are reported for usual elementary functions based on exhaustive simulations. A mixed framework including VHDL and Matlab R is used for those simulations.

  5. Enhancement techniques in fingerprints as a tool in dactyloscopy

    Moler, Emilce Graciela; Blotta, Eduardo Luis; Pastore, Juan Ignacio; Meschino, Gustavo; Ballarín, Virginia Laura
    In this work an application of image enhancement techniques in fingerprints is presented. Digital Image-processing technology was applied to restored fingerprints with non-uniform contrast. These fingerprints corresponded to unidentified persons who were murdered by Military Forces in 1976. In 1997, after a court decision, Human Right Organisations acceded to the microfilms of the Computer Records Division of the Province of Buenos Aires Police, which contained fingerprints and complementary information from these missing people. Unfortunately most of the fingerprints were taken with a reduction ratio of 41x, they were blurred and their spatial definition was not clear. These features made their...

  6. 3D requirements visualization

    Teyseyre, Alfredo Raúl
    The importance of correctly determining the requirements of a system at the very beginning of the development process it is a well known fact. Experience shows that the incorrect definition of the requirements leads to the development of deficient systems, increases the cost of its development or even causes projects to fail. Therefore it is crucial for the clients to verify that the planned system satisfies their needs. This means that the system must be described in a form that clients can clearly understand it. In this context, visualization techniques appear as a useful tool to help the users in...

  7. Dynamic deadlock detection under the OR requirement model

    Campos, Alvaro E.; Orellana, Christian Fabián; Soto, María Pía
    Deadlock detection is one of the most discussed problems in the literature. Although several al- gorithms have been proposed, the problem is still open. In general, the correct operation of an algorithm depends on the requirement model being considered. This article introduces a deadlock detection algorithm for the OR model. The algorithm is complete, because it detects all deadlocks, and it is correct, because it does not detect false deadlocks. In addition, the algorithm supports dynamic changes in the wait-for graph on which it works. Once finalized the algorithm, at least each process that causes deadlock knows that it is...

  8. Development of a relational database management system

    Ruiz, Anabel Natalia; Maldonado, Calixto; Martínez Spessot, Cesar Ignacio
    The studies of Relational Data Base Management Systems and Databases constitute nowadays a main tren of investigation in large businesses and universities of the entire world. The creation of a data base engine keeps being a challenge since there are aspects in which have not been achieved a final solution. Por example, the requeriments of storage of images, video, sound. etc. The purpuse of this project is to implement a Relational Database Manager System (RDBMS) and an Interpreter of Data Query Language that can be utilized in investigation an data processing development of applications. It is important to count on...

  9. An algorithm for minimising due times violations in flexible package production scheduling

    Ibáñez, Francisco S.; Díaz Araya, Daniel; Forradellas Martinez, Raymundo Quilez
    This paper includes part of the strategies used to solve a scheduling problem developed for a company that produces flexible packaging, presented in a quite general form though. In this problem it is necessary to schedule several jobs that involve four process and for each one of them there is a group of machines available (of similar characteristics). Each activity is performed on just one machine. Besides, for our application, the scheduling must try to verify certain conditions. For each process (and consequently for all the activities that perform this process) there is a list of attributes. The problem is...

  10. Selection of defuzzification method to obtain crisp value for representing uncertain data in a modified sweep algorithm

    Nurcahyo, Gunadi W.; Shamsuddin, Siti Mariyam; Alias, Rose Alinda; Noor Md Sap, Mohd
    We present a study of using fuzzy-based parameters for solving public bus routing problem where demand is uncertain. The fuzzy-based parameters are designed to provide data required by the route selection procedure. The uncertain data are represented as linguistic values which are fully dependent on the users preference. This paper focuses on the selection of the Defuzzification method to discover the most appropriate method for obtaining crisp values which represent uncertain data. We also present a step by step evaluation showing that the fuzzy-based parameters are capable to represent uncertain data replacing the use of exact data which common route...

  11. Using portable monitoring for heterogeneous clusters on Windows and Linux operating systems

    Kikuti, Daniel; Souza, Paulo S. L.; Souza, Simone R. S.
    This paper describes the advances obtained with the XPVM-W95 2.0, a novel monitoring tool for parallel applications that employ PVM-W95 (PVM for Windows) as well as PVM for Linux. The tool provides, at runtime, the appropriate information about parallel virtual machine configuration, parallel applications and workload from each node. The three more important aspects of the XPVM-W95 are: friendly graphical interface, portability and ability to deal with heterogeneity. These items were improved by version 2, mainly when considering the modularity rearrangement. Experiments demonstrate that XPVM-W95 has a stable behavior and reached the objectives proposed. XPVM-W95 allows a great portability of...

  12. Improved automatic discovery of subgoals for options in hierarchical

    Kretchmar, R. Matthew; Feil, Todd; Bansal, Rohit
    Options have been shown to be a key step in extending reinforcement learning beyond low-level reactionary systems to higher-level, planning systems. Most of the options research involves hand-crafted options; there has been only very limited work in the automated discovery of options. We extend early work in automated option discovery with a flexible and robust method.

  13. Techniques for improving the perfomance and scalability of directory-based shared-memory multiprocessors

    Acacio Sánchez, Manuel; García Carrasco, José Manuel
    Cache-coherent, nonumiform memory acces or cc-NUMA is an attractive architecture for building a spectrum of shared memory multiprocessors (whic are socing widespread use in commercial, technical and scientific applications). Unfortunately, there are some factors which limit the maximun number of processors that can be offered at a good price/perfomance ratio. This paper presents a survey of some of the proposals that have recently appeared focusing on tow of these factors: the increased cost, in terms of hardware overhead that the use of directories entails, and the long cache miss latencies obseved in these designs as a consequence of the indirection...

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