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This article presents three methods to forecast accurately the amount of traffic in TCP=IP based networks: a novel neural network ensemble approach and two important adapted time series methods (ARIMA and Holt-Winters). In order to assess their accuracy, several experiments were held using real-world data from two large Internet service providers. In(More)
Organizations aim to achieve business and information systems alignment, but actually " feel " and " suffer " , on a daily basis, the difficulties that inhibits the alignment achievement, in other words, the misalignments. This paper proposes a model, the Business and Information Systems MisAlignment Model (BISMAM), to understand, to classify and to manage(More)
Aligning business and information systems has been in the scope of research initiatives from decades. Recently, some efforts emerged with a complementary approach focused on the misalignments study. This paper proposes a misalignment approach based on the medical science perspective for nomenclature, classification and detection of misalignments. We show(More)
OBJECTIVE To evaluate the performance of traditional cardiovascular (CV) risk factors in identifying a higher than expected coronary atherosclerotic burden. METHODS We assessed 2069 patients undergoing coronary CT angiography, with assessment of calcium score (CS), for suspected coronary artery disease. A higher than expected atherosclerotic burden was(More)
Although some important technological developments have been achieved during last decade, information systems still do not answer efficiently enough to the continuous demands that organizations are facing – causing a non-alignment between business and information technologies (IT) and therefore reducing organization competitive abilities. This paper(More)
(1) To study the prevalence and severity of coronary artery disease (CAD) in diabetic patients. (2) To provide a detailed characterization of the coronary atherosclerotic burden, including the localization, degree of stenosis and plaque composition by coronary computed tomography angiography (CCTA). Single center prospective registry including a total of(More)
aBstract Organizations make extensive use of information systems to support planning, decision making, controlling, and to leverage competitive advantage. Organizations are also complex entities that integrate contrasting concepts such as strategy, people, processes, technology, and information. These concepts must be aligned towards the same purpose to(More)
This paper describes a case study where SofTrack-a Software Defect Report and Tracking System-was implemented using internet technology in a geographically distributed organization. Four medium to large size information systems with different levels of maturity are being analyzed within the scope of this project. They belong to the Portuguese Navy's(More)
INTRODUCTION Cardiac CT provides noninvasive information on cardiac anatomy, particularly in coronary artery disease. However, exposure to radiation has been identified as a limitation of this exam. The aim of this study was to evaluate variations in radiation dose over time and to identify variables associated with use of higher radiation doses. METHODS(More)