Carlos Juiz | Universitat de les Illes Balears (original) (raw)

Papers by Carlos Juiz

Design of real-time systems needs to take into account their performance behaviour before their i... more Design of real-time systems needs to take into account their performance behaviour before their implementation. This goal can be attained by means of queueing network modelling. To process this kind of models normally simulation is used with its inherent costs of debugging and ...

Procedia Computer Science, 2018

Simulation Practice and Theory, Apr 1, 2002

Given the importance of IT for organizations worldwide, IT Governance is an increasing concern fo... more Given the importance of IT for organizations worldwide, IT Governance is an increasing concern for C-suite officers. Inside IT, software is a key aspect in the governance scenario. The increasing pressures by regulatory, and compliance efforts are changing the software governance arena, thus there is a need to focus on the current state of the topic. Despite this acknowledged need, the studies on Software Governance are still scarce. In this paper, authors expand the software governance model introduced by Chulani et al. [1] with new concerns derived from the alignment of the model with the IT Governance standard, ISO/ IEC 38500 and the experience of authors. Moreover, the new model proposes the categorization of these concerns to govern software development activities aligned with IT Governance.

This year the number of Internet users worldwide reached 2.27 billion, almost exactly twice what ... more This year the number of Internet users worldwide reached 2.27 billion, almost exactly twice what it was in 5 years ago, 1.15 billion. The increasing number of users, especially due to the popularization of web applications and web-based services, produces continuously capacity problems at data centers due to performance requirements. These web applications, which run on web servers, have an influence in energy consumption at data centers. Thus, a new challenge directly related to this area of research emerges: the energy efficiency of web systems. Additionally, new server virtualization technologies are appearing and have significant benefits in terms of hardware utilization, energy efficiency and configuration flexibility for its performance. We propose a short study of energy consumption in relation to web server virtualization and performance.

Transforming Government: People, Process and Policy, Apr 23, 2020

Informatics (Basel), Sep 9, 2022

Science of Computer Programming, Jul 1, 2005

Computers in Industry, Apr 1, 2014

Procedia Computer Science, 2013

The Journal of Supercomputing, Oct 23, 2015

The ongoing trends in cloud computing demonstrate increasing need for efficient, yet economical d... more The ongoing trends in cloud computing demonstrate increasing need for efficient, yet economical data centers. Thus, recently the research community has focused its efforts on frameworks for optimised usage of the available resources that will result with energy-efficient and highly effective data centers. Toward this goal, in this paper we present a community-based framework for virtual machine placement inside a cloud data center. The framework is based on the complex network structural property of grouping tightly coupled nodes, and a matching process that maps virtual to physical communities while employing different optimisation functions on different hierarchy levels. The presented simulation results of the framework application reflect its high usage potential achieved by improvement in communication efficiency and reduced power consumption compared to the traditional heuristics.

Lecture Notes in Computer Science, 2008

... Mehdi Khouja Programme Committee Jeremy Bradley Mario Bravetti Lucy Cherkasova Lucia Cloth Mi... more ... Mehdi Khouja Programme Committee Jeremy Bradley Mario Bravetti Lucy Cherkasova Lucia Cloth Michel Cukier Tadeusz Czachórski Jean-Michel Fourneau Stephen Gilmore Armin Heindl Helmut Hlavacs András Horváth Carlos Juiz Tomá Kalibera Helen Karatza Leïla Kloul ...

This paper describes the already completed and verified first stage of a work in progress that ai... more This paper describes the already completed and verified first stage of a work in progress that aims to port a proposed optimised framework for virtual machine placement on hosts in a given cloud computing datacentre. The previously implemented and simulated framework using Matlab is being transferred to a richer cloud computing simulation environment that is CloudSim. The use of CloudSim permits, apart from validating the previous research, the introduction of many additional parameters and criteria in the simulated scenario thus enabling a far richer and in-depth analysis of the benefits and drawbacks of the proposed solution, such as power-awareness, that is an additional feature included in CloudSim libraries.

Architectures for the design of soft real-time systems typically do not facilitate the use of per... more Architectures for the design of soft real-time systems typically do not facilitate the use of performance tools that will enable a designer to analyse the performance of the system that is being designed. Intercommunication data areas, whose behaviours are characterised by interaction protocols, are the building blocks of many soft real-time systems. The interaction protocols are grouped into families depending

Software Engineering Research and Practice, 2003

European Defence companies have used MASCOT methodology in weapon system projects for real-time e... more European Defence companies have used MASCOT methodology in weapon system projects for real-time embedded software development. This method has been used for at least twenty years and it is still their primary design and development method. On the other hand, the ...