Search

The MAP-i Doctoral Programme in Informatics, of the Universities of Minho, Aveiro and Porto, In order to attain the promises of the Cloud Computing paradigm, systems need to be able to transparently adapt to environment changes. NoSQL databases, which are becoming pivotal systems in nowadays cloud infrastructures, exhibit the highly desirable scalability and availability properties. Scalability achieved by these databases is anchored on data independence; there is no clear relationship between data, and atomic inter-node operations are not a concern. Such assumption over data allows a paradigm shift on how to achieve the best performance. Unfortunately, current solutions put the burden on the application's developer to handle and master the speci cities of each system that is hindering a broader adoption. In this dissertation, we tackle the several shortcomings in current implementations of cloud-based NoSQL databases at three di erent levels. First, we present a cloud-enabled framework for the automatic and heterogeneous recon guration of NoSQL databases. This framework enables NoSQL databases to become autonomously elastic while providing a new load balancing component that takes into account data access patterns. Secondly, we propose a novel mechanism to partition data that takes into account the system workload. It estimates, in an autonomous way, a splitting point that leads to optimal load balancing in terms of requests. Finally, we develop a mechanism to accurately predict the resource usage of NoSQL databases resorting to an o ine trained model. Then, it can accurately estimate in real time the database resource usage for any request distribution only by knowing two parameters: i) cache hit ratio; and ii) incoming throughput. Both input values can be observed in real time or synthesized for request allocation decisions, furthermore it is su ciently simple and generic so it can be used with several databases., De modo a alcançar as promessas do paradigma da computação na nuvem, os sistemas têm de ser capazes de adaptar-se às mudanças de uma forma transparente. Os bancos de dados NoSQL que estão-se a tornar sistemas cruciais nas infraestruturas da nuvem, possuem as propriedades de escalabilidade e elevada disponibilidade. A escalabilidade está assente na independência de dados; pois não existe uma relação clara entre os mesmos, e operações atómicas que envolvam mais que um nó não são uma preocupação. Tal pressuposto permite uma mudança de paradigma na forma de alcançar o melhor desempenho. Infelizmente, as soluções atuais requerem responsabilidades adicionais a quem desenvolve as aplicações, nomeadamente a necessidade de manipular e dominar as especificidades de cada sistema. Esta situação esta a dificultar a adoção do paradigma. Nesta dissertação, abordamos v arias lacunas das atuais implementações de bases de dados NoSQL a três diferentes níveis. Primeiramente, apresentamos um sistema que permite a reconfiguração automática e heterogénea de bases de dados NoSQL, que permite ainda que essas mesmas bases de dados se tornem autonomamente elásticas e simultaneamente balancear a carga tendo em conta os padrões de acesso. Em segundo lugar, propomos um novo mecanismo de particionamento de dados que tem em conta o estado atual do sistema, ao estimar de forma autónoma qual o ponto ideal de divisão baseado nos pedidos. Finalmente, desenvolvemos um mecanismo para prever com precisão o uso de recursos pelas bases de dados NoSQL com base num modelo construído em modo online. Esse modelo permite estimar com elevada precisão e em tempo real o uso de recursos da base de dados para qualquer distribuição somente conhecendo dois parâmetros: i) a taxa de acessos com sucesso da cache e ii) o desempenho. Ambos os valores podem ser observados em tempo real, ou sintetizados para decisões de alocação, para al em disso, o mecanismo é suficientemente simples e genérico podendo ser utilizado em v arias bases de dados., Fundação para a Ciência e Tecnologia (FCT), que apoiou este trabalho através da bolsa de doutoramento (SFRH/BD/80111/2011), e ao Departamento de Informática da Universidade do Minho e ao HASLab - High Assurance Software Lab, que ofereceram-me as condições necessárias para realizar a presente tese.

Sin financiación 4.187 (2016) Q1, 26/160 Biotechnology and applied microbiology, 38/167 Genetics and heredity, 24/128 Medicine, research and experimental UEM

Introduction: Intraocular refractive procedures with the implantation of a Phakic Intraocular lens have become a safe efficient and predictable alternative for treating high ametropias when the use of corneal photoablative procedures is not possible. The implantation of Phakic intraocular lens preservs the accomodative function,is a reversable refractive procedure, with minimal induction of higher order aberrations compaed with corneal photoablative procedures. Methods: An analytical review of phakic intraocular lens was performed. Results: Critical issues of phakic intraocular lens indications, ancillary tests, options regading models designs, ranging, sizing , safety matters and surgicak care was discussed. Conclusion: Severl studies have demonstraded that phakic intraocular lens have a good predictability, stability and long term safety, Revista Sociedade Portuguesa de Oftalmologia, Vol. 39 N.º 1 (2015)

En este articulo investigue la relación que puede existir entre el conocimiento adquirido en la especialización en alta gerencia, y la actual forma de gestión seguridad en el escenario empresarial, el cual ha evolucionado desde el empirismo hasta la actual profesionalización liderada por la Universidad Militar Nueva Granada. Hoy en día, la profesionalización de la seguridad tanto en Colombia, como en Latinoamérica, es un arte que va en franco desarrollo a convertirse en una verdadera ciencia. Para nuestro caso, este desarrollo del conocimiento va desde un sinnúmero de diplomados, a un único pregrado y una única especialización. Por esta razón, desde la óptica académica se ha podido identificar que los contenidos curriculares están direccionados hacia el desarrollo de una fuerte labor técnica. Pero, ¿en la actualidad los profesionales de la seguridad necesitan un mayor nivel de formación que les genere herramientas para enfrentar los nuevos retos que demandan los cada vez mas exigentes y complejos procesos organizacionales?, la respuesta es: definitivamente, SI !!!!!!. En merito de la presente problemática, este articulo de investigación es una reflexión propositiva con visión académica que propenda por la generación de nuevas herramientas a través del desarrollo de un modelo académico de gerencia de alto nivel para la gestión de seguridad organizacional. This paper investigates the relationship that may exist between the knowledge gained specialization in senior management, and the current form of management security business scenario, which has evolved from empiricism to the current professionalization led by the Universidad Militar Nueva Granada . Today, the professionalization of security both in Colombia and in Latin America , is an art that goes into full development to become a true science. In our case , the development of knowledge ranging from countless graduates, to one undergraduate and unique expertise. For this reason, it has been from the academic perspective identify which curricula are directed towards the development of a strong technical work . But today 's security professionals need a higher level of training that will generate new tools to address the challenges demanded by increasingly demanding and complex organizational processes ?, the answer is definitely YES !!!!!! . In merit of this problem , this research article is a reflection purposeful academic vision that tends to generate new tools through the development of an academic model of top management for managing organizational security.

La amplia magnitud de la migración venezolana en Colombia no solo se dio por la solidez de la crisis en Venezuela, sino también porque el país receptor en su historia no había afrontado un fenómeno como este, lo cual esforzó al Gobierno a establecer planes de acción instantáneos debido a que no existía una planificación específica para afrontar dicha emergencia. Los efectos del proceso migratorio son variados, puesto que se relacionan con la salud, la alimentación, el trabajo y la vivienda. Sin embargo, uno de los más importantes y de mayor trascendencia es la seguridad, ya que son las zonas fronterizas las principales áreas afectadas ante el volumen de la población y las condiciones en las que llegan a estos lugares. Adicionalmente, las medidas impuestas por el presidente Nicolás Maduro han fragmentado la tranquilidad en los departamentos limítrofes principalmente. Es por lo anterior que el presente ensayo busca establecer los desafíos a la seguridad nacional de Colombia generados por la actual crisis migratoria, para lo cual primero se identifican los riesgos, se describen los efectos y finalmente se plantean los lineamientos de una estrategia enfocada en mitigar el impacto de este fenómeno. Tabla de contenido 1. Resumen……………………………………………………………………………………...4 2. Introducción…………………………………………………………………………………..5 3. Desarrollo……………………………………………………………………………………..6 4. Riesgos provenientes de la migración……………………………………………………..6 4.1. ¿Qué dificultades se presentaron en Venezuela y que conllevaron hacia la crisis?.……………………………………………………………………………………6 4.2. ¿Cuáles han sido las etapas que se destaquen de la migración venezolana?....................................................………………………………………8 4.3. ¿Cuáles son las características y razones actuales del proceso migratorio venezolano?...........................................................…………………………………9 5. ¿Qué efectos ha tenido la migración venezolana en Colombia?...................…………………………………………………………………….12 6. ¿Cuáles han sido los desafíos que le ha supuesto la migración venezolana al gobierno colombiano?......……………….…………………………………………………….……..14 6.1. Desafíos de la migración en materia de seguridad……………….………………...15 7. Estrategia de intervención de las Fuerzas Militares y el Gobierno Nacional………….16 7.1. ¿Qué es y cuáles son los objetivos del Plan éxodo?.........…………………………………………………………………………...16 8. Conclusiones………………………………………………………………………………..17 9. Bibliografía…………………………………………………………………………………..19 The broad magnitude of Venezuelan migration in Colombia was not only due to the solidity of the crisis in Venezuela, but also because the host country in its history had not faced such a phenomenon, This led the Government to put in place instant action plans because there was no specific planning to address the emergency. The effects of the migration process are varied, as they relate to health, food, work and housing. However, one of the most important and important is security, since it is the border areas that are the main areas affected by the size of the population and the conditions in which they reach these places. In addition, the measures imposed by President Nicolás Maduro have fragmented tranquillity in the neighbouring departments mainly. It is for this reason that the present essay seeks to establish the challenges to the national security of Colombia generated by the current migration crisis, for which the risks are first identified, It describes the effects and finally proposes the guidelines of a strategy focused on mitigating the impact of this phenomenon. Pregrado

Los negocios asociados a la prestación de servicios en el sector de la vigilancia y seguridad privada, cada día toman más realce teniendo en cuenta los altos ingresos operacionales que se pueden recibir con la prestación de los mismos. El sector de la vigilancia y seguridad privada fue regulado y normado a partir del Decreto Ley 356 del año 1994 mediante el cual se creó el Estatuto de Vigilancia y seguridad privada en el cual se especifican los requisitos para la operación en el sector. Por ser un negocio atractivo, la seguridad privada ha tenido inversión extranjera, sin embargo se encuentra un vacío jurídico para que las empresas extranjeras puedan invertir en este sector teniendo en cuenta lo contemplado en algunas normas donde se exceptúan las actividades de defensa y seguridad nacional y que los socios de estas empresas sean de nacionalidad Colombiana, sin embargo en la actualidad existe la operación de algunas de ellas. El Congreso de la República en la actualidad está estudiando un proyecto de ley para regular la vigilancia y seguridad privada y de esta manera actualizar la norma que se encuentra vigente desde el año 1994, este proyecto tiene incluido algunos artículos que probablemente afecta directamente la participación y continuidad de empresas extranjeras en el negocio de la seguridad privada. El presente ensayo analiza las diferente normatividad jurídica y el estado actual de la inversión extranjera en Colombia. The businesses associated to the provision of services in the sector of the security and private security, every day take more highlight taking into account the high operational revenues that can be received with the provision of the same ones. The private security and surveillance sector was regulated and regulated by Decree Law 356 of 1994, which created the Statute of Surveillance and Private Security in which the requirements for the operation in the sector are specified. Because it is an attractive business, private security has had foreign investment, however there is a legal vacuum to allow foreign companies to invest in this sector taking into account what is contemplated in some rules that exclude defense and national security activities and That the partners of these companies are of Colombian nationality, however at the moment there is the operation of some of them. The Congress of the Republic is currently studying a bill to regulate security and private security and thus update the standard that has been in force since 1994, this project has included some articles that are likely to directly affect the participation and Continuity of foreign companies in the private security business. This paper analyzes the different legal regulations and the current state of foreign investment in Colombia.

Actualmente la gestión del riesgo dejó de ser un elemento de empresas multinacionales o para muchos; tabú. Día a día las metodologías que se han implementado en un principio en esas empresas con visión corporativa de protección de sus activos, infraestructuras, información, personas y secretos competitivos, han evolucionado. No obstante, de las versiones conocidas varios aspectos y/o elementos se mantienen por la eficacia de los resultados obtenidos. Uno de estos elementos es el trabajo de campo el cual en el ensayo se ha querido reconocer como elemento fundamental para el analista de riesgos en la posterior aplicación sobre el terreno. En el desarrollo del ensayo además se encontraran aspectos como los ámbitos de aplicación, los aportes que este genera, la importancia de su adecuada aplicación y los resultados que se pueden obtener siendo estos últimos los más influyentes para la adecuada administración del riesgo, su gestión y tratamiento. Currently risk management ceased to be a member or to many multinational companies; taboo. Day by day the methodologies that have been implemented initially in those companies with corporate vision protecting your assets, infrastructure, information, people, competitive secrets, have evolved. However, known versions of various aspects and / or elements are held by the effectiveness of the results obtained. One of these elements is the field which in the trial has recognized as critical to the risk analyst in the back field application element. In addition assay development issues such as scope, the contributions it generates, the importance of proper implementation and results obtainable latter being the most influential for proper risk management, management to meet and treatment.

Dissertação de mestrado em Engenharia Informática, NoSQL databases opt not to offer important abstractions traditionally found in relational databases in order to achieve high levels of scalability and availability: transactional guarantees and strong data consistency. These limitations bring considerable complexity to the development of client applications and are therefore an obstacle to the broader adoption of the technology. In this work we propose a middleware layer over NoSQL databases that offers transactional guarantees with Snapshot Isolation. The proposed solution is achieved in a non-intrusive manner, providing to the clients the same interface as a NoSQL database, simply adding the transactional context. The transactional context is the focus of our contribution and is modularly based on a Non Persistent Version Store that holds several versions of elements and interacts with an external transaction certifier. In this work, we present an implementation of our system over Apache Cassandra and by using two representative benchmarks, YCSB and TPC-C, we measure the cost of adding transactional support with ACID guarantees., As bases de dados NoSQL optam por não oferecer importantes abstrações tradicionalmente encontradas nas bases de dados relacionais, de modo a atingir elevada escalabilidade e disponibilidade: garantias transacionais e critérios de coerência de dados fortes. Estas limitações resultam em maior complexidade no desenvolvimento de aplicações e são por isso um obstáculo à ampla adoção do paradigma. Neste trabalho, propomos uma camada de middleware sobre bases de dados NoSQL que oferece garantias transacionais com Snapshot Isolation. A abordagem proposta e não-intrusiva, apresentando aos clientes a mesma interface NoSQL, acrescendo o contexto transacional. Este contexto transacional e o cerne da nossa contribuição e assenta modularmente num repositório de versões não-persistente e num certificador externo de transações concorrentes. Neste trabalho, apresentamos uma implementação do nosso sistema sobre Apache Cassandra e, recorrendo a dois benchmarks representativos, YCBS e TPC-C, medimos o custo do suporte do paradigma transacional com garantias transacionais ACID., Fundação para a Ciência e a Tecnologia (FCT) - Project Stratus/FCOMP-01-0124-FEDER-015020; within project Pest/ FCOMP-01-0124-FEDER-022701., ERDF - European Regional Development Fund through the COMPETE Programme (operational programme for competitiveness)., European Union Seventh Framework Programme (FP7) under grant agreement no 257993 (CumuloNimbo).