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Publications

2018

SMEs Performance and Internationalization: A Traditional Industry Approach

Authors
Madaleno, M; Varum, CA; Horta, I;

Publication
ANNALS OF ECONOMICS AND FINANCE

Abstract
This study approaches the internationalization-performance (I-P) relationship following an innovative strategy, using DEA to calculate a financial performance metric that considers several financial indicators. We then apply a truncated regression to evaluate the relationship between financial performance and internationalization for a sample of firms in the footwear Portuguese industry for the period 2010-2013, using several controls, while exploring potential non-linear effects. Results tend to support the conclusion that export participation leads to increased efficiency, eventually through the so-called learning effects. For our case, the relationship is U-shaped. So, beyond a certain level the degree of international engagement might compromise efficiency.

2017

Downscaling Aggregate Urban Metabolism Accounts to Local Districts

Authors
Horta, IM; Keirstead, J;

Publication
JOURNAL OF INDUSTRIAL ECOLOGY

Abstract
Urban metabolism accounts of total annual energy, water, and other resource flows are increasingly available for a variety of world cities. For local decision makers, however, it may be important to understand the variations of resource consumption within the city. Given the difficulty of gathering suburban resource consumption data for many cities, this article investigates the potential of statistical downscaling methods to estimate local resource consumption using socioeconomic or other data sources. We evaluate six classes of downscaling methods: ratio-based normalization; linear regression (both internally and externally calibrated); linear regression with spatial autocorrelation; multilevel linear regression; and a basic Bayesian analysis. The methods were applied to domestic energy consumption in London, UK, and our results show that it is possible to downscale aggregate resource consumption to smaller geographies with an average absolute prediction error of around 20%; however, performance varies widely by method, geography size, and fuel type. We also show how mapping these results can quickly identify districts with noteworthy resource consumption profiles. Further work should explore the design of local data collection strategies to enhance these methods and apply the techniques to other urban resources such as water or waste.

2017

Analysis of the relationship between local climate change mitigation actions and greenhouse gas emissions - Empirical insights

Authors
Azevedo, I; Horta, I; Leal, VMS;

Publication
ENERGY POLICY

Abstract
Local actions are seen as of major importance for the achievement of climate change mitigation targets. In the past few years, the number of local action plans towards climate change mitigation has been increasing, and it is essential to analyze their contribution to the achievement of global targets. Even if the relationship between local action plans and the reduction of energy use and GHG emissions is often assumed, this has not yet been validated nor quantified by empirical studies involving a large number of municipalities. Thus, the aim of this paper is to. perform an empirical analysis on the link between local action plans and energy use and GHG emissions. The analysis is composed by a test of hypothesis and a regression analysis, performed for the municipalities of three European countries Portugal, Sweden and United Kingdom. The main conclusion is that, in the context of these three countries, the analysis performed was not able to detect a significant impact related to the existence of local plans on GHG emissions. From the panel data regression analysis, it was possible to confirm that external factors, not directly related to local climate change mitigation actions, have a significant impact on GHG emissions.

2017

Modelling the relationship between heating energy use and indoor temperatures in residential buildings through Artificial Neural Networks considering occupant behavior

Authors
Magalhaes, SMC; Leal, VMS; Horta, IM;

Publication
ENERGY AND BUILDINGS

Abstract
The heating energy demand stated in energy performance certificates (EPC) and in other instruments used in the of evaluation of building's energy performance is usually determined assuming very specific (reference) indoor behavioral/heating patterns. Particularly, they tend to assume that households heat (nearly) the entire house to a "comfort" temperature during (nearly) all the heating season. However, several field studies have shown that there are major niches of the housing stock which do not follow this pattern (even the majority, in some geographical areas). Considering this matter, it would be interesting to build models able to estimate heating energy use values resultant from occupation and heating patterns different from those considered as "reference". This work aimed at producing tools to assess the relationship between heating energy use and indoor temperatures at different levels of occupant behavior (in terms of where, when and at what temperature households heat their dwellings). This relationship was expressed through models while still takes advantage of the information from the certificates. The work developed artificial neural networks (ANN) that characterize the relationship between heating energy use, indoor temperatures and the heating energy demand under reference conditions (typically available from energy rating/certificates) in the residential buildings, for different occupant behaviors heating patterns. Theoretically, these models can be applicable to any national geographical context. The data for building the ANNs was obtained from dynamic thermal building simulations using ESP-r, considering a large number of housing types and hypothetical occupation and heating patterns (i.e., which parts of the house are heated, when and at what temperature). From the analysis performed, it was possible to conclude that the developed ANN models proved to perform well (R-2 > 0.93) in estimating either heating energy use or indoor temperature, both at an individual and at the building stock level. This work may have important contributions in the energy planning practices regarding the residential building stock.

2017

Evaluation of Strengthening Techniques Using Enhanced Data Envelopment Analysis Models

Authors
Horta, IM; Varum, C;

Publication
Strengthening and Retrofitting of Existing Structures - Building Pathology and Rehabilitation

Abstract

Supervised
thesis

2019

Assessing the impact of operational performance improvement on business partners’ profitability - the case of a luxury fashion e-commerce

Author
Luís José Preto Peres Marcos

Institution
UP-FEUP

2019

Order Tracking model for enhanced delivery experience: a predictive approach

Author
José Pedro da Silva Sá

Institution
UP-FEUP

2018

Improvement of a Control ManagementWeb Application by Considering Operational Costs and Stocks

Author
José Miguel Pinto Nunes da Costa

Institution
UP-FEUP

2018

Development of an Assessment Tool to Enhance Order Process Performance for an E-Tail Fashion Company

Author
Maria João Coelho Santos

Institution
UP-FEUP

2018

Development of a tool for customer performance improvement: a B2B e-tail case

Author
Ana Sofia Baptista Souteiro

Institution
UP-FEUP