Mémoire numérisé par la Direction des bibliothèques de l'Université de Montréal.

La selección de software de administración de base de datos genera desconcierto en las organizaciones que se ven confundidas en la adquisición de productos que satisfagan sus requerimientos informáticos a un costo razonable que brinde rentabilidad y ventaja competitiva a la organización. En este proceso un evento importante es la elaboración de una Solicitud de Propuesta o Request For Proposal (RFP) del software de administración de base de datos. El objetivo principal del presente trabajo es presentar un esquema metodológico que brinden apoyo en la preparación de una RFP de software de administración de base de datos relacional para mainframes y que se pueda aplicar a un amplio rango de organizaciones evadiendo los problemas que puedan ocurrir al elaborar un RFP con esquemas no estructurados, dicho enfoque está basado en esquemas teóricos y en la experiencia de su aplicación en organizaciones en nuestro país y en otros países. El trabajo ha sido concebido para apoyar a los responsables de tomar la decisión de adquirir software en una organización, para que dispongan de un esquema de trabajo y un conjunto de criterios que les apoye en la generación de un RFP de forma que se cumplan los objetivos de la organización en lo que respecta a la satisfacción de los requerimientos de software de administración de base de datos relacional para mainframe y le permita obtener ventaja competitiva. Palabras Claves: SOFTWARE DE ADMINISTRACION DE BASE DE DATOS, MAINFRAME, MODELO RELACIONAL, SOLICITUD DE PROPUESTA, EVALUACION DE SOFTWARE / --- Selection of software database management generates confusion in organizations are confused in the acquisition of products that meet their computing needs at a reasonable cost to provide profitability and competitive advantage to the organization. In this process an important event is the development of a Request for Proposal or Request For Proposal (RFP) management software database. The main objective of this paper is to present a methodological framework to provide support in the preparation of an RFP management software relational database for mainframes and that can be applied to a wide range of organizations avoiding the problems that may occur when preparing one RPF with unstructured schemes, this approach is based on theoretical schemes and the experience of its application in organizations in our country and in other countries. The work has been designed to support those responsible for making the decision to purchase software in an organization, so that they have a framework and a set of criteria to support them in creating an RFP so as to meet the objectives of the organization with respect to meeting the requirements of management software for relational database allows mainframe and gain competitive advantage. Keywords: MANAGEMENT SOFTWARE DATABASE, MAINFRAME, RELATIONAL MODEL, REQUEST FOR PROPOSAL, SOFTWARE EVALUATION

The wakes behind a variety ofaxisymmenic bodies were investigated with flow visualization and hot-wire measurements. The main objective of this study was to correlate changes in the time-averaged features of the wake with changes in the characteristics of the coherent large-scale structure resulting from changing the solidity of the wake generator or by introducing periodic disturbances to force the wake. The use of an axisymmenic probe holder permitted instantaneous decomposition of the axialvelocity field into temporal and azimuthal Fourier modes. Increases in the body solidity resulted in nearly proportional increases in the size of the mean wake boundary. For the non-shedding (low body solidity) wakes, flow visualization shows that the amplitude of discernible large-scale structure is small in comparison to the wake diameter, and there is no evidence of a recirculation region. For the shedding wakes, flow visualization reveals large-scale structure with amplitude that is comparable in size to the wake diameter, and a recirculation region is observed that oscillates in axial extent Fourier analysis of velocity measurements discloses that the temporal scale of the coherent large-scale structure for a non-shedding wake decreases in value with downstream distance while the corresponding scale for a shedding wake is constant Significant changes in the both the time-averaged features of the wake and in the large-scale structure usually occurred only when the forcing frequency was near the natural shedding frequency (within ± 25%). Those time-averaged features changed by forcing include the drag, the mean- and variance-profile shapes, and the size of the wake. The mean profile was observed to change from a regular shape to that which resembles a variance profile. Forcing results in a number of peaks being present in 2-D spectra plots, most of which are the result of non-linear interactions of the forcing wave with the natural shedding frequency. The flow visualization reveals that those peaks which are harmonics or subharmonics of the forcing frequency may be more prominent than the forcing frequency if they are closer to the natural shedding frequency of the unforced wake.

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.2 billion in savings. We also investigate the influence of using two different measures of pier capacity and incorporate 30 new ships and submarines to demonstrate SHIP's ability to station the proposed future force structure. / US Navy (USN) author.

Les annotations, dans le langage de programmation de Java, sont une manière d'inclure des méta-données dans le code source d' un programme. Des annotations peuvent être employées pour prolonger la langue de Java avec des concepts spécifiques à un domaine. Des cadres d'annotation déjà sont adoptés par l'industrie; cependant, leur développement demeure complexe, et il est fait en grande partie d'une façon ad hoc. En développant le cadre d'annotation, le programmeur doit s'assurer que le programme qui emploie l'annotation est conforme aux contraintes définies pour lui. De telles contraintes sont souvent reléguées à la documentation du cadre. En plus de ceci, les processeurs courants d'annotation offrent juste au programmeur de cadre l'AST du programme comme entité de manipulation. Ceci force le programmeur à reify les annotations lui-même s'il veut des éléments plus élevés d'abstraction. Nous proposons deux cadres d'annotation. AVal, fournit un certain nombre de contraintes réutilisables, déclaratives et extensibles qui peuvent être employées pour spécifier le cadre d'annotation, et peut être interprété afin de valider un programme annoté. Et, ModelAn permet au lotisseur de cadre d'annotation de décrire un modèle qui correspond aux annotations dans le cadre. Des programmes annotés sont représentés comme exemples du modèle d'annotation, et contraintes vérifiées lui. De ce modèle, des classes de Java qui reify les annotations sont produites. Pour valider l'approche, nous construisons le modèle d'annotation, et décrivons les contraintes comme AVal et expressions de OCL de trois cadres industriels d'annotation: Fraclet, un cadre d'annotation pour le modèle composant de fractale, JWS pour le développement des services de Web dans Java, et la persistance api de Java. / Annotations, in the Java programming language, are a way to embed meta-data into the source of a program. Annotations can be used to extend the Java language with concepts specific to a domain. Annotation frameworks are already being adopted by industry; however, their development remains complex, and it is done largely in an ad-hoc manner. When developing the annotation framework, the programmer must make sure that the program that uses the annotation complies with the constraints defined for it. Such constraints are often relegated to the documentation of the framework. ln addition to this, current annotation processors just offer to the framework programmer the AST of the program as manipulation entity. This forces the programmer to reify the annotations himself if he wants higher abstraction elements. We propose two annotation frameworks. AVal, provides a number of reusable, declarative and extensible constraints that can be used to specify the annotation framework, and can be interpreted in order to validate an annotated program. And, ModelAn allows the annotation framework developer to describe a model that corresponds to the annotations in the framework. Annotated programs are represented as instances of the annotation model, and the constraints checked on it. From this model, Java classes that reify the annotations are generated. To validate the approach, we construct the annotation model, and describe the constraints as AVal and OCL expressions of three industrial annotation frameworks: Fraclet, an annotation framework for the Fractal component model, JWS for the development of web serviœs in Java, and the Java Persistence APl.