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Publications

2017

A Scalable Load Forecasting System for Low Voltage Grids

Authors
Reis, M; Garcia, A; Bessa, RJ;

Publication
2017 IEEE MANCHESTER POWERTECH

Abstract
A recent research trend is driven to increase the monitoring and control capabilities of low voltage networks. This paper describes a probabilistic forecasting methodology based on kernel density estimation and that makes use of distributed computing techniques to create a highly scalable forecasting system for LV networks. The results show that the proposed algorithm outperforms three benchmark models (one for point forecast and two for probabilistic forecasts) and demonstrate the applicability of the distributed in-memory computing solution for a practical operational scenario. The ultimate goal is to integrate information about net-load forecasts in power flow optimization frameworks for low voltage networks in order to solve technical constraints with the available home energy management system flexibility.

2017

Context-aware HDR video distribution for mobile devices

Authors
Melo, M; Barbosa, L; Bessa, M; Debattista, K; Chalmers, A;

Publication
MULTIMEDIA TOOLS AND APPLICATIONS

Abstract
HDR video on mobile devices is in its infancy and there are no solutions yet that can achieve full HDR video reproduction due to computational power limitations. In this paper we present a novel and versatile solution that allows the delivery of HDR video on mobile devices by taking into account contextual information and retro-compatibility for devices that do not have the computational power to decode HDR video. The proposed solution also enables the remote transmission of HDR video to mobile devices in real-time. This context-aware HDR video distribution solution for mobile devices is evaluated and discussed by considering the impact of HDR videos over conventional low dynamic range videos on mobile devices as well as the challenge of playing HDR videos directly locally or remotely.

2017

A robust optimisation framework in composite generation and transmission expansion planning considering inherent uncertainties

Authors
Mansouri, SA; Javadi, MS;

Publication
JOURNAL OF EXPERIMENTAL & THEORETICAL ARTIFICIAL INTELLIGENCE

Abstract
This paper presents a robust optimisation framework for long-term composite generation and transmission expansion planning problem which considers inherent uncertainties such as load growth, fuel cost and renewable energy output uncertainties. In this paper, a bi-level robust optimisation framework is proposed to accommodate wind output uncertainty in line with the uncertain demanded loads and uncertain fuel cost. The addressed optimisation problem is modelled as a mixed-integer optimisation framework with the objective of providing a robust expansion plan while maintaining the minimum cost expansion. In order to evaluate the robustness of each plan, an off-line Lattice Monte Carlo simulation technique is adopted in this study. The validity of the proposed method is examined on a simple six-bus and modified IEEE 118-bus test system as a large-scale case study. The simulation results show that the presented method is both satisfactory and consistent with expectation. © 2016 Informa UK Limited, trading as Taylor & Francis Group.

2017

Context acquisition in auditory emotional recognition studies

Authors
Carneiro, D; Pinheiro, AP; Novais, P;

Publication
JOURNAL OF AMBIENT INTELLIGENCE AND HUMANIZED COMPUTING

Abstract
This paper describes an environment to assess auditory emotional recognition based on a mobile application. The primary aim of this work is to provide a valuable instrument that can be used both in research and clinical settings, responding to the strong need of validated measures of emotional processing, especially in Portugal. The secondary aim is to acquire and study the participants' interaction behavior with the technological device (e.g. touch patterns, touch intensity), in search for a relationship with medical conditions, cognitive impairments, auditory emotional recognition capacities or socio-demographic indicators. This will establish the basis for the prediction of such aspects as a function of an individual's interaction with technological devices, potentially providing new diagnostic tools.

2017

Special issue on design of algorithms and architectures for signal and image processing

Authors
Gorgon, M; Cardoso, JMP; Gohringer, D; Indrusiak, LS;

Publication
JOURNAL OF SYSTEMS ARCHITECTURE

Abstract

2017

Responsive website vs. mobile application: Street food of Phnom Penh, Cambodia

Authors
Ros, M; Restivo, A; Giesteira, B;

Publication
International Journal of Technology, Knowledge and Society

Abstract
The exponential growth of mobile usage in developing countries, the tendencies between the usage of Apps and Responsive Websites, the characteristics as well as advantages and disadvantages between the two, urge this study to be conducted. This study aims to compare the effectiveness, the efficiency, and satisfaction (usability) between different mobile solution: the Apps and the Responsive Website. User-Centered Design Methodology was used in this study with an example of street food in Phnom Penh, the capital city of Cambodia. Some of the ethnographic methods are field observation, semi-structured interviews, and the creation of personas. These methods collect information to determine motivations and needs of the user. A mobile solution which will be created and evaluated as a prototype in its different stages of development is also proposed. It will also take into consideration the connection between social network sites and the platform because Facebook has lately become the second most important source of information after television in Cambodia. Eventually, a suggested prototype for this sort of street food in a developing country will be proposed as well as a robust framework comparing this prototype as Mobile Application and Mobile Responsive website platforms.

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