Cloud Computing: caracterización de los impactos positivos obtenidos por la utilización del modelo Cloud Computing por las pymes, basado en la tipología de modelos de negocio de este tipo de empresas

[ES] El Cloud Computing produce importantes beneficios a las empresas usuarias, en especial a las pymes. A través de él estas empresas tienen mejor acceso a las tecnologías de la información que necesitan para su funcionamiento. Según las estadísticas de utilización del cloud computing, estas empresas hacen un uso limitado de este tipo de servicios. El objetivo del presente trabajo es contribuir a potenciar la utilización del cloud por parte de las pymes. Según nuestro diagnóstico, el primer problema es del desconocimiento del cloud por parte de las pymes. Para abordar este problema se realiza una descripción del cloud computing y se analizan los beneficios que les proporciona a las empresas usuarias. Para contribuir a convencer a los empresarios de las ventajas que el uso del cloud les proporciona, se aborda el cloud desde una óptica empresarial y para ello se propone un modelo de negocio tipo para las pymes, para posteriormente relacionar los bloques en que se puede descomponer el citado modelo de negocio con las tecnologías de la información y la comunicación adecuadas para el funcionamiento de la empresa, accedidas a través del Cloud.Fons Gómez, FJ. (2014). Cloud Computing: caracterización de los impactos positivos obtenidos por la utilización del modelo Cloud Computing por las pymes, basado en la tipología de Modelos de Negocio de este tipo de empresas. http://hdl.handle.net/10251/38864.Archivo delegad

Revenue maximization problems in commercial data centers

PhD ThesisAs IT systems are becoming more important everyday, one of the main concerns is that users may face major problems and eventually incur major costs if computing systems do not meet the expected performance requirements: customers expect reliability and performance guarantees, while underperforming systems loose revenues. Even with the adoption of data centers as the hub of IT organizations and provider of business efficiencies the problems are not over because it is extremely difficult for service providers to meet the promised performance guarantees in the face of unpredictable demand. One possible approach is the adoption of Service Level Agreements (SLAs), contracts that specify a level of performance that must be met and compensations in case of failure. In this thesis I will address some of the performance problems arising when IT companies sell the service of running ‘jobs’ subject to Quality of Service (QoS) constraints. In particular, the aim is to improve the efficiency of service provisioning systems by allowing them to adapt to changing demand conditions. First, I will define the problem in terms of an utility function to maximize. Two different models are analyzed, one for single jobs and the other useful to deal with session-based traffic. Then, I will introduce an autonomic model for service provision. The architecture consists of a set of hosted applications that share a certain number of servers. The system collects demand and performance statistics and estimates traffic parameters. These estimates are used by management policies which implement dynamic resource allocation and admission algorithms. Results from a number of experiments show that the performance of these heuristics is close to optimal.QoSP (Quality of Service Provisioning)British Teleco

Allocation distribuée de ressources dans les réseaux virtuels privés

Un réseau virtuel privé (VPN) est défini comme un réseau logique qui permet de connecter plusieurs utilisateurs qui appartiennent au même groupe d’utilisateurs (entreprise, fournisseurs, etc.) et disperser géographiquement. Un VPN est protégé par un contrat d’accord de service (SLA) entre le client et le fournisseur de service (ISP) qui définit les différents paramètres tels que le niveau de service (disponibilité et performance) et la qualité de service (QoS). À travers un modèle non-coopératif répétitif, nous proposons une architecture autonome et distribuée pour des fins d’allocation des ressources au sein d’un VPN en permettant les opérateurs VPN de bien gérer leur bande passante d’une façon optimale et de partager leurs ressources non utilisables (bande passante), en assurant la qualité de service sans l’intervention de l’ISP. Pour inciter les opérateurs VPN à collaborer dans ce modèle, nous avons adopté la théorie de jeux comme un mécanisme et plus spécifiquement le modèle non coopératif répété de la théorie de jeux. Ce modèle offre aux opérateurs la possibilité de gérer d’une façon autonome leur bande passante, permet aux VPN(s) d’atteindre la qualité de service souhaitée, et ainsi assurer la disponibilité des ressources à court, moyen et long terme

Revenue maximization problems in commercial data centers

As IT systems are becoming more important everyday, one of the main concerns is that users may face major problems and eventually incur major costs if computing systems do not meet the expected performance requirements: customers expect reliability and performance guarantees, while underperforming systems loose revenues. Even with the adoption of data centers as the hub of IT organizations and provider of business efficiencies the problems are not over because it is extremely difficult for service providers to meet the promised performance guarantees in the face of unpredictable demand. One possible approach is the adoption of Service Level Agreements (SLAs), contracts that specify a level of performance that must be met and compensations in case of failure. In this thesis I will address some of the performance problems arising when IT companies sell the service of running ‘jobs’ subject to Quality of Service (QoS) constraints. In particular, the aim is to improve the efficiency of service provisioning systems by allowing them to adapt to changing demand conditions. First, I will define the problem in terms of an utility function to maximize. Two different models are analyzed, one for single jobs and the other useful to deal with session-based traffic. Then, I will introduce an autonomic model for service provision. The architecture consists of a set of hosted applications that share a certain number of servers. The system collects demand and performance statistics and estimates traffic parameters. These estimates are used by management policies which implement dynamic resource allocation and admission algorithms. Results from a number of experiments show that the performance of these heuristics is close to optimal.EThOS - Electronic Theses Online ServiceQoSP (Quality of Service Provisioning) : British TelecomGBUnited Kingdo

Towards a 3D hydrodynamic characterization from the joint analysis and blending of multiplatform observations for potential marine applications in the southeastern Bay of Biscay

277 p.La necesidad de un mayor conocimiento y una gestión sostenible de las áreas costeras ha suscitado la instalación de observatorios que monitorizan su estado. A pesar de que la información aportada por estos observatorios es esencial la compleja hidrodinámica de estas áreas dificulta una completa caracterización de las mismas. Además, la cobertura espacial de las observaciones es, en general, relativamente escasa especialmente en la columna de agua. Por tanto, el objetivo de esta tesis es combinar los datos disponibles de diferentes plataformas de observación en el sureste del Golfo de Bizkaia proporcionados por el sistema de oceanografía operacional de la costa vasca (EuskOOS) y también por fuentes externas para caracterizar en 3D la hidrodinámica de la zona. Para ello se han analizado conjuntamente las diferentes observaciones disponibles y se han utilizado métodos de reconstrucción de datos que permiten expandir dichas observaciones en 3D. Las observaciones conjuntas permiten detectar los principales procesos hidrodinámicos como los remolinos o la corriente de talud. Por otro lado, se observa que el usode los métodos de reconstrucción evaluados es factible en el área, especialmente el de la interpolación óptima de orden reducido (ROOI). Las observaciones y las corrientes reconstruidas por el ROOI han permitido caracterizar un remolino en 3D en el área de estudio por primera vez. Además, los campos de corrientes reconstruidos han posibilitado simular la advección superficial y subsuperficial de huevos y larvas de anchoa en la zona, mostrando el potencial del ROOI para aplicaciones marinas

Um arcabouço de monitoramento e auto-proteção para nuvens privadas

Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Ciência da Computação, Florianópolis, 2012Um dos novos desafios do paradigma de computação em nuvem é a administração efetiva destes sistemas e recursos devido, a sua heterogeneidade, escalabilidade e a falta de ferramentas adequadas. Consumo de energia, desempenho, provisão de recursos e segurança são somente alguns fatores relevantes no gerenciamento. Neste âmbito, a computação autônoma visa facilitar e automatizar este gerenciamento (gerenciamento sem intervenção humana) através de quatro propriedades: auto-otimização, auto-cura, auto-configuração e auto-proteção. O uso de computação autônoma em computação em nuvem, principalmente focando em nuvens privadas, foi pouco explorado até o momento. Este trabalho procura dar um dos primeiros passos para portar os princípios de computação autônoma para nuvens privadas com a definição de uma arquitetura para o monitoramento deste tipo de nuvem, uma das bases da computação autônoma. Esta também propõe o uso simplificado de umas das propriedades, a auto-proteção que se beneficia da base de monitoramento desenvolvida. Para validar esta proposta foi desenvolvido um arcabouço de código aberto e gratuito denominado PANOPTES. O Panoptes usa o paradigma multi-agente para o monitoramento efetivo, distribuído e escalável dos recursos físicos e virtuais da nuvem e, assim, fornece a base para a tomada correta de decisões. A interação com o administrador de sistemas e a sincronia com os objetivos da organização ocorre através da definição de políticas de alto nível. Dentre outras, as vantagens deste arcabouço são a facilidade de estender e adaptar o arcabouço para as próprias necessidades e a compatibilidade com os padrões em vigor. No decorrer do trabalho, os paradigmas supracitados e os pilares deste foram documentados para facilitar a sua compreensão, além de justificar as escolhas de cada parte importante na arquitetura, relacionar os padrões mais relevantes no desenvolvimento e uso destes. Por fim, um caso de uso é apresentado para validação da proposta

A model for the development of service agreements in the Information and Communication Technology sector

SAs are documents that specify the business relationship between stakeholders to an outsourcing agreement. SAs specify this relationship in a legally binding manner that assists in managing expectations of the stakeholders about the service provision. According to Verma (1999), an SA is a precise statement of the expectations and obligations that exist in a business relationship between two organisation: the service provider and the client. In order for organizations to have successful outsourcing partnerships, they need well crafted methods of developing Service Agreements (SAs). Successful methods will produce a conclusive contract that will act as a working document that details the spirit of cooperation between the service provider and the service recipient. This research investigates the development of SAs in the Information and Communication Technology (ICT) sector, and proposes a model for their development. A number of models for SA development have been analysed. Models are analysed from leading researchers in the area, from software houses such as Microsoft and from international standards organisations such as the BS15000 which stipulates the ITIL framework. Eight development principles are identified and explored. An investigation into SAs and their development is conducted. A model is proposed that is composed of the development principles. The development of SAs was explored in an empirical study by means of a survey administered to industry practitioners and a series of interviews with managers in the ICT industry. The results of the study indicate varying levels of support for the development principles and limited relationship between the development principles and the success of the SA, as defined by the number of changes made to the SA after it is completed

Aplicaciones e innovación de la ingeniería en ciencia y tecnología

El mundo ha avanzado con la llegada de la ciencia y tecnología desde los diversos campos que la conforman con una visión de innovación involucrando a la sociedad y así satisfacer las necesidades que se han convertido en una problemática para el campo científico. El camino para llegar a un concepto de ciudades inteligentes, por ejemplo, puede conjugar varias aristas que dan cuenta de un aporte de diversas competencias y destrezas por parte de la comunidad científica. De esta manera, podemos encontrar aportes en redes eléctricas inteligentes, servicios de comunicación masiva, aprovechamiento de los recursos hídricos, análisis de ondas sísmicas, manejo de datos en la nube o la interpretación de imagen para aplicaciones médicas, cumpliendo así una vasta demanda de oportunidades para la generación de nuevo conocimiento que aplica la ciencia y tecnología en favor de la sociedad. Este libro es una recopilación de artículos científicos del área de Ciencia y Tecnología de la Universidad Politécnica Salesiana, trabajo presentado desde las ingenierías: Civil, Electricidad, Electrónica y Automatización, Computación, Telecomunicaciones y Mecatrónica

An investigation of a framework for the implementation of service management in the information and communication technology sector

Service Management (SM) is an integrated, cyclical and collaborative approach to the management of service requirements and levels. It involves the definition of client expectations, the satisfying of those expectations and the perpetual refining of the business agreement (Sturm 2001). SM in the ICT sector is a comprehensive process that extends beyond the development of Service Agreements (SAs). A number of identifiable steps constitute the progressive implementation of a managed services environment, the key components of which are a readiness to provide services, the accurate elicitation, management and satisfying of client requirements and the continual improvements to the business relationship. Unfortunately, a number of SM initiatives fail. These failures can be attributed to a lack of SM understanding, the absence of a fully implemented SM strategy, poor communication and people issues. This research describes an investigation of SM implementation. A number of recognised frameworks are explored and critically analysed. The common strengths of these frameworks and the results of an exploratory pilot study are used to construct an SM implementation framework. This framework is then tested empirically by means of an online survey, and revised in the light of the results of this survey. The framework comprises two distinct phases, namely a Foundation phase and a Managed Services phase. The Foundation phase comprises 8 critical preparatory activities that take a service provider to state of readiness to provide and manage ICT services. The Managed Services phase comprises 5 key cyclical steps for the management of ICT services, including Planning, Analysis, Design, Implementation and Review