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Publications

2015

Skinfolds compressibility and calliper's time response in male elite athletes

Authors
Bini, A; Amaral, TF; Oliveira, BM; Carvalho, P; Teixeira, VH;

Publication
EUROPEAN JOURNAL OF CLINICAL NUTRITION

Abstract
[abstract]

2015

Existence and stability of solutions of the cubic complex Ginzburg-Landau equation with delayed Raman scattering

Authors
Facao, M; Carvalho, MI;

Publication
PHYSICAL REVIEW E

Abstract
We found two stationary solutions of the cubic complex Ginzburg-Landau equation (CGLE) with an additional term modeling the delayed Raman scattering. Both solutions propagate with nonzero velocity. The solution that has lower peak amplitude is the continuation of the chirped soliton of the cubic CGLE and is unstable in all the parameter space of existence. The other solution is stable for values of nonlinear gain below a certain threshold. The solutions were found using a shooting method to integrate the ordinary differential equation that results from the evolution equation through a change of variables, and their stability was studied using the Evans function method. Additional integration of the evolution equation revealed the basis of attraction of the stable solutions. Furthermore, we have investigated the existence and stability of the high amplitude branch of solutions in the presence of other higher order terms originating from complex Raman, self-steepening, and imaginary group velocity.

2015

Modelling a Supplier Quality Management System

Authors
Sousa, JP; Cunha, CR; Morais, EP; Gomes, JP;

Publication
INNOVATION MANAGEMENT AND SUSTAINABLE ECONOMIC COMPETITIVE ADVANTAGE: FROM REGIONAL DEVELOPMENT TO GLOBAL GROWTH, VOLS I - VI, 2015

Abstract
This paper presents the study of modeling a quality supplier management system, based on a particular case of a Portuguese company in the auto industry that supplies parts to the major automobile manufacturers. For this, a study of a practical case of Supplier Quality Management (SQM) that follow the ISTO/TS 16949 standard was done, to analyze the functioning of their processes. Finally, a model is proposed streamline and automate supplier performance management processes, with the aim of improving the efficiency throughout the supplier chain.

2015

A Reconfigurable Architecture for Binary Acceleration of Loops with Memory Accesses

Authors
Paulino, N; Ferreira, JC; Cardoso, JMP;

Publication
ACM TRANSACTIONS ON RECONFIGURABLE TECHNOLOGY AND SYSTEMS

Abstract
This article presents a reconfigurable hardware/software architecture for binary acceleration of embedded applications. A Reconfigurable Processing Unit (RPU) is used as a coprocessor of the General Purpose Processor (GPP) to accelerate the execution of repetitive instruction sequences called Megablocks. A toolchain detects Megablocks from instruction traces and generates customized RPU implementations. The implementation of Megablocks with memory accesses uses a memory-sharing mechanism to support concurrent accesses to the entire address space of the GPP's data memory. The scheduling of load/store operations and memory access handling have been optimized to minimize the latency introduced by memory accesses. The system is able to dynamically switch the execution between the GPP and the RPU when executing the original binaries of the input application. Our proof-of-concept prototype achieved geometric mean speedups of 1.60x and 1.18x for, respectively, a set of 37 benchmarks and a subset considering the 9 most complex benchmarks. With respect to a previous version of our approach, we achieved geometric mean speedup improvements from 1.22 to 1.53 for the 10 benchmarks previously used.

2015

IEEE 802.11 Rate Adaptation Algorithms in Underwater Environment

Authors
Teixeira, F; Campos, R; Ricardo, M;

Publication
Proceedings of the 10th International Conference on Underwater Networks & Systems, WUWNET 2015, Arlington, VA, USA, October 22-24, 2015

Abstract
The demand for broadband underwater communications is being pushed by the increasing use of Autonomous Underwater Vehicles (AUV) in underwater missions. IEEE 802.11, already used in AUV for above water communications, can also be employed underwater to enable cost-effective, high bandwidth, short range communications. However, the high RF attenuation underwater induces high variations of received power, which may affect the performance of existing rate adaptation algorithms designed for over-the-air networks. This paper evaluates the most relevant state-of-the-art IEEE 802.11 rate adaptation algorithms in underwater environment. Simulation results show the AARF algorithm outperforms the widely used Minstrel algorithm, as well as the CARA, RRAA and ONOE algorithms. Copyright 2015 ACM.

2015

Decision Support System for the Agri-food Sector - The Sousacamp Group Case

Authors
Branco, F; Goncalves, R; Martins, J; Perez Cota, MP;

Publication
NEW CONTRIBUTIONS IN INFORMATION SYSTEMS AND TECHNOLOGIES, VOL 1, PT 1

Abstract
The agri-food organizations evolution, and its inherent need for well supported decision making, has led to an increase on the integration of IT/IS into their business and operational processes. With this in mind, an analysis was performed to the use of systems designed to support business decisions, thus allowing to acknowledge that there was none that answered to the needs inherent to organization from the mushroom production sector. This led to the definition and implementation of a DSS system, with the necessary features and qualities, which would help the mentioned activity sector needs. This DSS was designed and tested in a real environment through the implementation of a case study within a eatable mushrooms production company named "Sousacamp Group". With the implementation of the proposed DSS, the referred business group has reported an increased in their performance levels and decision making accuracy.

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