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3. Electricity Price Forecasting in European Day Ahead Markets: A Greedy Consideration of Market Integration

Author

Ties Van Der Heijden, Jesus Lago, Peter Palensky, and Edo Abraham

Subjects
Electricity price forecasting, European market integration, day ahead markets, deep neural networks, deep learning, feature analysis, Electrical engineering. Electronics. Nuclear engineering, TK1-9971
Abstract

In this manuscript we explore European feature importance in Day Ahead Market (DAM) price forecasting models, and show that model performance can deteriorate when too many features are included due to over-fitting. We propose a greedy algorithm to search over candidate countries for European features to be used in a DAM price forecasting model, that can be applied to several regression and machine learning modelling methodologies. We apply the algorithm to build price forecasting models for the Dutch market, using candidate countries selected through an integrated analysis based on open-source European electricity market data. Feature importance is visualised using an Auto Regressive and Random Forest model. We explain these results using cross-border flow and DAM price data. Two types of models (LEAR and the Deep Neural Network) are considered for the DAM price forecasting with and without European features. We show that in the Dutch case, taking European market integration into account improves the Mean Absolute Error (MAE) of the best performing DAM price forecasting model by 3.1%, the relative MAE (rMAE) by 3.85%, and the Symmetrical Mean Absolute Percentage Error (sMAPE) by 0.31 p.p., compared to the best forecasting model without European features. Through statistical testing we show that European features improve the accuracy of the forecasts with statistical significance.

Published
2021
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5. Analysis and Design of Dual-Band Folded-Shorted Patch Antennas for Robust Wearable Applications

Author

Rahil Joshi, Symon K. Podilchak, Dimitris E. Anagnostou, Constantin Constantinides, Muhammad Nazrin Ramli, Herwansyah Lago, and Ping Jack Soh

Subjects
Folded-shorted patch (FSP) antenna, wearable antennas, TM modes, Telecommunication, TK5101-6720
Abstract

A flexible folded-shorted patch (FSP) antenna with dual-band functionality for wearable applications is presented. The proposed antenna is operational at 400 MHz and 2.4 GHz and can be considered compact for the lower operational frequency band (0.13λo × 0.13λo × 0.02λo). Flexible polydimethylsiloxane (PDMS) is used as the substrate due to its relatively low-cost as well as its robustness for wearable applications. A comparison of the fields radiated by the FSP, in terms of the TM010 and TM001 modes are also presented considering the cavity model which is actually related to the two noted operating bands. Equations needed to calculate the beam pattern and directivity for these modes are also derived and their results are compared to commercial full-wave simulations and measurements of a wearable PDMS prototype. An analysis was also performed to characterize the relevant dimensions that are important for independently controlling or tuning the resonant frequencies for these two radiating modes. The proposed antenna can be suitable for robust wearable applications such as military search and rescue operations, emergency response team units, and medical services.

Published
2020
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6. Dual-Band, Dual-Sense Textile Antenna With AMC Backing for Localization Using GPS and WBAN/WLAN

Author

Rahil Joshi, Ezzaty Faridah Nor Mohd Hussin, Ping Jack Soh, Mohd Faizal Jamlos, Herwansyah Lago, Azremi Abdullah Al-Hadi, and Symon K. Podilchak

Subjects
Dual-band dual-sense antenna, wearable antenna, AMC plane, Electrical engineering. Electronics. Nuclear engineering, TK1-9971
Abstract

A wearable textile antenna with dual-band and dual-sense characteristics is presented in this work. It operates at the 2.45 GHz band for WBAN and WLAN applications, and at the 1.575 GHz band for Global Positioning System (GPS) applications. An antenna backing based on an artificial magnetic conductor (AMC) plane operating at 2.45 GHz band is introduced to reduce the backward radiation and to improve antenna gain. It consists of a $3\times 3$ array of square patch unit cells, where each unit cell is integrated with four square slits and a square ring. A square-shaped patch is then located on top of the substrate as its radiator. To enable dual-band operation, two corners of this radiator are truncated, with each of the four corners incorporated with a rectangular slit to enable its circular polarization characteristic in the GPS band. Simulation and experimental results are in good agreement and indicate proper antenna operation with linear polarization in the 2.45 GHz band and circular polarization in the 1.575 GHz band, with realized gain of 1.94 dBi and 1.98 dBic, respectively.

Published
2020
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26. Finding Frequent Patterns in a Technological Education Program of Pernambuco, Brazil

Author

Rabbani, Emilia Rahnemay Kohlman, primary, Reboucas, Juliana De Souza, additional, De Albuquerque Neves, Marcia M., additional, Da Luz, Gabriel Magalhaes, additional, Do Nascimento, Willian Vieira, additional, Da Luz, Gustavo H. Magalhaes, additional, Lago, Felipe Guerra, additional, De Sousa Maia, Maria Celeste, additional, Da Silva Barros, Maicon H. L. Ferreira, additional, Endo, Patricia Takako, additional, and Bastos-Filho, Carmelo Jose Albanez, additional

Published
2022
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29. Finding Frequent Patterns in a Technological Education Program of Pernambuco, Brazil

Author

Emilia Rahnemay Kohlman Rabbani, Juliana De Souza Reboucas, Marcia M. De Albuquerque Neves, Gabriel Magalhaes Da Luz, Willian Vieira Do Nascimento, Gustavo H. Magalhaes Da Luz, Felipe Guerra Lago, Maria Celeste De Sousa Maia, Maicon H. L. Ferreira Da Silva Barros, Patricia Takako Endo, and Carmelo Jose Albanez Bastos-Filho

Published
2022

36. Message from the SAIP, NEMI, ECRF, Artifacts, Posters, Journal First, and Workshops Track Chairs

Author

Xu, Xiwei, Poort, Eltjo, Klein, John, Nakagawa, Elisa Yumi, Lago, Patricia, Liu, Yan, Lu, Qinghua, Buhnova, Barbora, Tang, Antony, Navarro, Elena, Xin, Peng, Perez, Jennifer, Mirandola, Raffaela, Cai, Yuanfang, Lewis, Grace, Aletia, Aldeida, Software and Sustainability (S2), Network Institute, Software & Services, Information Management & Software Engineering, and Amsterdam Sustainability Institute

Abstract

The 19th IEEE International Conference on Software Architecture (ICSA 2022) solicited different types of submissions structured into the following tracks: the main Technical Track (included in the ICSA main proceedings), the Software Architecture in Practice (SAIP) track, the New and Emerging Ideas NEMI) track, the Early Career Researchers Forum (ECRF), the artifacts track, the poster track, the Journal First track, and the Workshop and Tutorial track (included in the companion volume of ICSA 2022 proceedings). Each of these tracks, except for the Technical Track, is presented in the following sections.

Published
2022

45. Sustainability in Software Architecture: A Systematic Mapping Study

Author

Vasilios Andrikopoulos, Rares-Dorian Boza, Carlos Perales, Patricia Lago, and Software Engineering

Subjects
Software Engineering (cs.SE), FOS: Computer and information sciences, software architecture, systematic mapping, Computer Science - Software Engineering, sustainability, sustainability-aware architecture
Abstract

Sustainability is an increasingly-studied topic in software engineering in general, and in software architecture in particular. There are already a number of secondary studies addressing sustainability in software engineering, but no such study focusing explicitly on software architecture. This work aims to fill this gap by conducting a systematic mapping study on the intersection between sustainability and software architecture research with the intention of (i) reflecting on the current state of the art, and (ii) identifying the needs for further research. Our results show that, overall, existing works have focused disproportionately on specific aspects of sustainability, and in particular on the most technical and "inward facing" ones. This comes at the expense of the holistic perspective required to address a multi-faceted concern such as sustainability. Furthermore, more reflection-oriented research works, and better coverage of the activities in the architecting life cycle are required to further the maturity of the area. Based on our findings we then propose a research agenda for sustainability-aware software architecture., Comment: 8 pages

Published
2022

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