5,561 research outputs found
A common operator for FFT and FEC decoding
International audienceIn the Software Radio context, the parametrization is becoming an important topic especially when it comes to multistandard designs. This paper capitalizes on the Common Operator technique to present new common structures for the FFT and FEC decoding algorithms. A key benefit of exhibiting common operators is the regular architecture it brings when implemented in a Common Operator Bank (COB). This regularity makes the architecture open to future function mapping and adapted to accommodated silicon technology variability through dependable design
A concrete product derivation in software product line engineering: a practical approach
Software Product Lines enable the development of a perfect family of products by reusing shared assets in a systematic manner. Product derivation is a critical activity in software product line engineering and one of the most pressing issues that a software product line must address. This work introduces an approach for automating the derivation of a product from a software product line. The software product line is part of a product family that evolved from a non-structured approach to managing variability. The automated derivation approach relies on product configurations and the refactoring of feature models. The approach was deployed and evaluated in the automotive domain using a real-world software product line. The outcome demonstrates that the approach generates a product in an automated and successful manner.This work has been supported by FCT – Fundação para a Ciência e Tecnologia within the R&D Units Project Scope: UIDB/00319/2020
Modern Information Systems
The development of modern information systems is a demanding task. New technologies and tools are designed, implemented and presented in the market on a daily bases. User needs change dramatically fast and the IT industry copes to reach the level of efficiency and adaptability for its systems in order to be competitive and up-to-date. Thus, the realization of modern information systems with great characteristics and functionalities implemented for specific areas of interest is a fact of our modern and demanding digital society and this is the main scope of this book. Therefore, this book aims to present a number of innovative and recently developed information systems. It is titled "Modern Information Systems" and includes 8 chapters. This book may assist researchers on studying the innovative functions of modern systems in various areas like health, telematics, knowledge management, etc. It can also assist young students in capturing the new research tendencies of the information systems' development
The Design of a System Architecture for Mobile Multimedia Computers
This chapter discusses the system architecture of a portable computer, called Mobile Digital Companion, which provides support for handling multimedia applications energy efficiently. Because battery life is limited and battery weight is an important factor for the size and the weight of the Mobile Digital Companion, energy management plays a crucial role in the architecture. As the Companion must remain usable in a variety of environments, it has to be flexible and adaptable to various operating conditions. The Mobile Digital Companion has an unconventional architecture that saves energy by using system decomposition at different levels of the architecture and exploits locality of reference with dedicated, optimised modules. The approach is based on dedicated functionality and the extensive use of energy reduction techniques at all levels of system design. The system has an architecture with a general-purpose processor accompanied by a set of heterogeneous autonomous programmable modules, each providing an energy efficient implementation of dedicated tasks. A reconfigurable internal communication network switch exploits locality of reference and eliminates wasteful data copies
Using Variability Management in Mobile Application Test Modeling
Mobile applications are developed to run on fast-evolving platforms, such as Android or iOS. Respective mobile devices are heterogeneous concerning hardware (e.g., sensors, displays, communication interfaces) and software, especially operating system functions. Software vendors cope with platform evolution and various hardware configurations by abstracting from these variable assets. However, they cannot be sure about their assumptions on the inner conformance of all device parts and that the application runs reliably on each of them—in consequence, comprehensive testing is required. Thereby, in testing, variability becomes tedious due to the large number of test cases required to validate behavior on all possible device configurations. In this paper, we provide remedy to this problem by combining model-based testing with variability concepts from Software Product Line engineering. For this purpose, we use feature-based test modeling to generate test cases from variable operational models for individual application configurations and versions. Furthermore, we illustrate our concepts using the commercial mobile application “runtastic” as example application
Activity-aware Stress Sensory System
Continuous stress monitoring may able to help analyzing and enhance the awareness of an individual on their stress patterns and provide more reliable data information for physicians in interventions. In the past years research, studies on mental stress sensory system were limited inside laboratory environment. However, excluding the effects of physical activity can be impractical while developing a wearable stress sensory system for daily use. In this project, effects of external factors from environment on Galvanic Skin Response (GSR) measurements and integration of several stress sensory system were studied. Electrocardiogram (ECG), GSR, and Activity Recognition System (ARS) were studied under different physical activities: sitting, standing, lying and walking. It is showed from the studies that an overall accuracy of 94.7% in ARS is achieved by using two sensor node system (at thigh and ankle each) which an improvement of 27.3% from using single sensor node system. It is further demonstrated that ARS could help improve in accuracy of wearable stress sensory system
Managing software development information in global configuration management activities
Software Configuration Management (SCM) techniques have been considered the entry point to rigorous software engineering, where multiple organizations cooperate in a decentralized mode to save resources, ensure the quality of the diversity of software products, and manage corporate information to get a better return of investment. The incessant trend of Global Software Development (GSD) and the complexity of implementing a correct SCM solution grow not only because of the changing circumstances, but also because of the interactions and the forces related to GSD activities. This paper addresses the role SCM plays in the development of commercial products and systems, and introduces a SCM reference model to describe the relationships between the different technical, organizational, and product concerns any software development company should support in the global market
A virtual factory for smart city service integration
Tese de Doutoramento em Informática (MAP-i)In the context of smart cities, governments are investing efforts on creating public
value through the development of digital public services (DPS) focusing on specific
policy areas, such as transport. Main motivations to deliver DPS include reducing
administrative burdens and costs, increasing effectiveness and efficiency of government
processes, and improving citizens’ quality of life through enhanced services and simplified
interactions with governments.
To ensure effective planning and design of DPS in a given domain, governments face
several challenges, like the need of specialized tools to facilitate the effective planning
and the rapid development of DPS, as well as, tools for service integration, affording
high development costs, and ensuring DPS conform with laws and regulations.
These challenges are exacerbated by the fact that many public administrations develop
tailored DPS, disregarding the fact that services share common functionality
and business processes.
To address the above challenges, this thesis focuses on leveraging the similarities of
DPS and on applying a Software Product Line (SPL) approach combined with formal
methods techniques for specifying service models and verifying their behavioural properties.
In particular, the proposed solution introduces the concept of a virtual factory
for the planning and rapid development of DPS in a given smart city domain. The
virtual factory comprises a framework including software tools, guidelines, practices,
models, and other artefacts to assist engineers to automate and make more efficient
the development of a family of DPS.
In this work the virtual factory is populated with tools for government officials and
software developers to plan and design smart mobility services, and to rapidly model
DPS relying on SPLs and components-base development techniques.
Specific contributions of the thesis include: 1) the concept of virtual factory; 2)
a taxonomy for planning and designing smart mobility services; 3) an ontology to fix
a common vocabulary for a specific family of DPS; 4) a compositional formalism to
model SPLs, to serve as a specification language for DPS; and 5) a variable semantics
for a coordination language to simplify coordination of services in the context of SPLs.No contexto das cidades inteligentes, os governos investem esforços na criação de valor
público através do desenvolvimento de serviços públicos digitais (DPS), concentrandose
em áreas polĂticas especĂficas, como os transportes. As principais motivações para
entregar o DPS incluem a redução de custos administrativos, o aumento da eficácia
dos processos do governo e a melhoria da qualidade de vida dos cidadãos através de
serviços melhorados e interações simplificadas com os governos.
Para garantir um planeamento efetivo do DPS num determinado domĂnio, os governos
enfrentam vários desafios, como a necessidade de ferramentas especializadas para
facilitar o planeamento eficaz e o rápido desenvolvimento do DPS, bem como ferramentas
para integração de DPS, reduzindo altos custos de desenvolvimento e garantindo
que os DPS estejam em conformidade com as leis e regulamentos.
Esses desafios são exacerbados pelo fato de que muitas administrações públicas
desenvolvem o DPS sob medida, desconsiderando o fato de que os serviços compartilham
funcionalidade e processos de negĂłcios comuns.
Para enfrentar os desafios, esta tese concentra-se em aproveitar as semelhanças dos
DPS aplicando uma abordagem de Software Product Lines (SPL) combinada com métodos
formais para especificar modelos de DPS e verificar propriedades. Em particular,
introduz o conceito de uma fábrica virtual (VF) para o planeamento e desenvolvimento
rápido de DPS num domĂnio de cidade inteligente. A VF compreende ferramentas de
software, diretrizes, modelos e outros artefatos para auxiliar os engenheiros a automatizar
e tornar mais eficiente o desenvolvimento de uma famĂlia de DPS.
Neste trabalho, a VF é preenchida com ferramentas para várias partes para planear
e projetar serviços de mobilidade inteligente (MI), e modelar rapidamente o DPS com
base em SPLs e técnicas de desenvolvimento baseadas em componentes.
Contribuições especĂficas da tese incluem: 1) o conceito de VF; 2) uma taxonomia
para planear serviços de MI; 3) uma ontologia para fixar um vocabulário comum para
uma famĂlia especĂfica de DPS; 4) um formalismo composicional para modelar SPLs,
e servir como uma linguagem de especificação para DPS; e 5) uma semântica variável
para uma linguagem de coordenação para simplificar a coordenação.This work was funded by FCT – Foundation for Science and Technology, the Portuguese Ministry of Science, Technology and Higher Education, through the Operational Programme for Human Capital (POCH). Grant reference: PD/BD/52238/201
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