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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)
IK is an object-oriented platform that simpliies the construction of applications that handle persistent and distributed data. A single programming paradigm is used to manipulate volatile, persistent and distributed objects uniformly. Object invocation is the basic primitive of the system, embodying all the features required for transparent handling of(More)
In order to ensure that technology supports business needs and that IT investments deliver the desired value, it is fundamental to define an Information System Architecture (ISA) and measure its accurateness to the business model and existing technologies. Thus, in this paper we are concern on evaluating ISA by measuring its qualities (relevant at(More)
IP networks are currently the major communication infrastructure used by an increasing number of applications and heterogeneous services, including voice services. In this context, the Session Initiation Protocol (SIP) is a signaling protocol widely used for controlling multimedia communication sessions such as voice or video calls over IP networks, thus(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)
INTRODUCTION AND OBJECTIVES Percutaneous coronary intervention (PCI) with paclitaxel drug-eluting balloons (DEBs) is used mainly for treatment of in-stent restenosis (ISR) and small vessel disease. Our objective was to evaluate the clinical efficacy of this strategy in a multicenter registry. METHODS Between 2009 and 2010 a prospective registry from two(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)