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Publicações

2019

Smart household management systems with renewable generation to increase the operation profit of a microgrid

Autores
Hakimi, SM; Saadatmandi, M; Shafie Khah, M; Catalão, JPS;

Publicação
IET Smart Grid

Abstract
During the past few years, due to the growth of electric power consumption, generation costs as well as rises in the level of greenhouse gases efficiency bring special focus on distributed generation. Developing distributed generation resources, especially renewable energy resources, is one of the safest ways to solve such problem. These resources have been decentralised by being installed close to the houses producing few kilowatts. Therefore, there are no losses in transmission lines and provide response for demand. Based on their benefits, the use of such energy resources should be developed in the future, but its management and optimal use is a major challenge. This has become one of the main concerns ofenergy systems researchers. In the current study, an innovative model is provided as a strategic management. It is intended to optimise the operation in smart homes consisting of generation units such as a wind turbine, solar panels, storages, and un/controllable loads. The main objective of this optimisation management is to maximise microgrid profitability for 24 h. The overall results of the model proved that the profit of microgrid increased significantly.

2019

A Study on the Impact of Data Characteristics in Imbalanced Regression Tasks

Autores
Branco, P; Torgo, L;

Publicação
2019 IEEE International Conference on Data Science and Advanced Analytics, DSAA 2019, Washington, DC, USA, October 5-8, 2019

Abstract

2019

Project risk management practices: the organizational maturity influence

Autores
Crispim, J; Silva, LH; Rego, N;

Publicação
INTERNATIONAL JOURNAL OF MANAGING PROJECTS IN BUSINESS

Abstract
Purpose The purpose of this paper is to identify patterns of project risk management (PRM) practices' adoption, and provides empirical evidence concerning the importance (and key attributes) of organizational PRM maturity to the use of risk-related practices and project performance. Design/methodology/approach The research involved two phases: interviews with five project managers, and a worldwide survey of project managers that resulted in the analysis of 865 valid questionnaire responses. Cluster analysis was used to classify PRM practices' use, factor analysis to detect the structure of the relationship between the variables measuring PRM practices' use and a multiple regression analysis (with canonical correlation) to further reveal the different degrees to which PRM practices and organizational maturity are associated. Findings The identified patterns of risk practices' adoption indicate that different contexts of organization PRM maturity and project complexity influence practices selection. The PRM practices related with targets (e.g. time-phased budget plan) are the most used, and those related to tools and techniques (e.g. S-curve) are the least used. Additionally, the obtained results confirm that organizational PRM maturity influences risk practices' usage, moderated by project complexity, and organizational PRM maturity influences project performance. Originality/value Empirical methods were used to investigate the relationship between organizational PRM maturity and a large set of PRM practices with project complexity as a moderator. Gaps in the use of PRM practices (i.e. areas where more PRM knowledge and training are needed) were identified. Finally, this work identifies the attributes of organizational maturity with implications in practices' usage and project performance.

2019

Strain Effect - A Case Study About the Power of Nano-Influencers

Autores
Oliveira, MAY; Cardoso, AS; Goncalves, M; Tavares, A; Branco, F;

Publicação
2019 14TH IBERIAN CONFERENCE ON INFORMATION SYSTEMS AND TECHNOLOGIES (CISTI)

Abstract
This article serves to show how things are changing when it comes to business and social networking. Nowadays, it is hard to find a business that does not have an account on any social network, and we can safely say that social media is a crucial aspect for any business enterprise - to sell their products, to be seen and, obviously, to make more money. We talk about the possibility to mix innovation, business strategy and social media. To complement this research, we focused our work on a Portuguese start-up - Strain - that intends to prove marketing is changing and that it actually welcomes the change, with social networks at the base of their business. They intend to use online influencers to promote the image of a brand, free of charge, and earn discounts on it. It is, indeed, a win-win situation, where each of the three parts (the company itself, clients and Strain) is a winner one way or the other.

2019

Assessment of Flexibilities and Smart Grid Technologies in the Planning and Operation of Congested European Distribution Networks

Autores
Tavares, Bruna; Cibis, Kevin Christopher; Wruk, Julian; Zdrallek, Markus; MacDonald, Robert; Sæle, Hanne; Berg, Kjersti; Landsverk, Henrik;

Publicação

Abstract
In this contribution the approaches that were developed in the European project SmartGuide are presented. Within its scope it is analysed how to address the challenges in planning and operating distribution systems resulting from the general transformation of the energy system, in particular concerning the development of generation and load. The paper presents four different methodologies and tools that facilitate the assessment of flexibilities and smart grid technologies for the reinforcement of European smart grids. Subsequently, the derivation of European planning guidelines by utilising the results of the tools is described.????

2019

Major Optical Clearing Mechanisms

Autores
Oliveira, LMC; Tuchin, VV;

Publicação
SpringerBriefs in Physics

Abstract
The optical immersion clearing is an effective method to reduce light scattering in tissues, but to optimize each treatment, it is necessary to understand the mechanisms involved. Since these treatments are intended to be temporary, it is also important to know if the mechanisms involved are reversible. Various studies have been made to evaluate and characterize the mechanisms of optical clearing. In all cases studied, two major mechanisms were observed—the tissue dehydration and the refractive index matching mechanisms. Some particular studies have reported that the agents used in treatments also dissolve proteins and suggested that protein dissolution is also a clearing mechanism. All these mechanisms have been reported as reversible, both on ex vivo or on in vivo studies. We make an analysis on these studies and present a method based on ex vivo collimated transmittance and thickness measurements to characterize the major clearing mechanisms—tissue dehydration and refractive index matching. Although this method can only be made with ex vivo tissues, alternative measurements are suggested for in vivo characterization of the clearing mechanisms. © 2019, The Author(s), under exclusive license to Springer Nature Switzerland AG.

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