A Water Utility Mapping Application for the City of Elko, Nevada

This project explains how a small town in northeastern Nevada improved the collection of data for the local water utility department with the use of a GIS. The initial need was to improve and expand the city’s existing GIS data holdings by incorporating ESRI’s ArcGIS product to accommodate the mapping needs of the Engineering and Municipal Water Departments. The collection of data into a GIS is used to find, improve, and reduce time spent on researching for information needed for planning and decision making. Data assessment and conversion comprised a major portion of the project. The database design was modified with the use of an existing water utility data model based on the assessment provided by the client. The software design for the project utilizes out-of-the-box ArcGIS 9.2 tools and functionality. The use of a geometric network was implemented to execute trace analysis on the water network available with use of the Utility Network Analyst toolbar. The importance of using GIS for the water utility department has proven to be more than a pretty map but rather a tool that can be used to solve problems when they arise which helps save time and money for the community

Stability of the replica symmetric solution in diluted perceptron learning

We study the role played by the dilution in the average behavior of a perceptron model with continuous coupling with the replica method. We analyze the stability of the replica symmetric solution as a function of the dilution field for the generalization and memorization problems. Thanks to a Gardner like stability analysis we show that at any fixed ratio $\alpha$ between the number of patterns M and the dimension N of the perceptron ($\alpha=M/N$), there exists a critical dilution field $h_c$ above which the replica symmetric ansatz becomes unstable.Comment: Stability of the solution in arXiv:0907.3241, 13 pages, (some typos corrected

On Consistency of Operational Transformation Approach

The Operational Transformation (OT) approach, used in many collaborative editors, allows a group of users to concurrently update replicas of a shared object and exchange their updates in any order. The basic idea of this approach is to transform any received update operation before its execution on a replica of the object. This transformation aims to ensure the convergence of the different replicas of the object, even though the operations are executed in different orders. However, designing transformation functions for achieving convergence is a critical and challenging issue. Indeed, the transformation functions proposed in the literature are all revealed incorrect. In this paper, we investigate the existence of transformation functions for a shared string altered by insert and delete operations. From the theoretical point of view, two properties - named TP1 and TP2 - are necessary and sufficient to ensure convergence. Using controller synthesis technique, we show that there are some transformation functions which satisfy only TP1 for the basic signatures of insert and delete operations. As a matter of fact, it is impossible to meet both properties TP1 and TP2 with these simple signatures.Comment: In Proceedings Infinity 2012, arXiv:1302.310

MAQUIAVELO, Nicolás, El Príncipe. La estrategia del líder.

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