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Timarchi S.,Shahid Beheshti University | Fazlali M.,Shahid Beheshti University | D.cotofana S.,TUDelft
Proceedings - IEEE International Conference on Computer Design: VLSI in Computers and Processors | Year: 2010

Given that modulo 2n±1 are the most popular moduli in Residue Number Systems (RNS), a large variety of modulo 2n±1 adder designs have been proposed based on different number representations. However, in most of the cases, these encodings do not allow the implementation of a unified adder for all the moduli of the form 2n-1, 2 n, and 2n+1. In this paper, we address the modular addition issue by introducing a new encoding, namely, the storedunibit RNS. Moreover, we demonstrate how the proposed representation can be utilized to derive a unified design for the moduli set {2n-1,2n,2 n+1}. Our approach enables a unified design for the moduli set adders, which opens the possibility to design reliable RNS processors with low hardware redundancy. Moreover, the proposed representation can be utilized in conjunction with any fast state of the art binary adder without requiring any extra hardware for end-around-carry addition. © 2010 IEEE.

Rajabalinejad M.,Ecole Polytechnique de Montreal | Mahdi T.,Ecole Polytechnique de Montreal | van Gelder P.,TUDelft
Natural Hazards | Year: 2010

In this study, we address the effective method to apply a novel reliability method integrated with finite element models to the safety assessment of pilot site Scheldt in the Netherlands. This site was considered as one of the three main pilot sites in Europe to assess the application of newly suggested techniques in order to reduce and manage the flood risk in the Floodsite project. http://www.floodsite.net, 2004-2009). The novel method of dynamic bounds (DB) is applied to this site after a successful experience in (Rajabalinejad in Reliability methods for finite element models, 1 edn. IOS Press, Amsterdam, 2009). In this study, the bi-functional response of the finite element model is considered, and the dimensional uncertainty is defined presenting the expected uncertainty for a certain dimension in the DB method. The uncertainty is used as a judgment tool to choose the dimension for the DB method for the desired accuracy. The results obtained by applying this technique are presented in this paper. © 2010 Springer Science+Business Media B.V.

Verstrynge E.,Catholic University of Leuven | Schueremans L.,Catholic University of Leuven | Van Gemert D.,Catholic University of Leuven | Hendriks M.A.N.,TUDelft
Engineering Structures | Year: 2011

Masonry which is subjected to high, sustained stress levels can suffer from long-term damage accumulations. This type of stress-induced damage interacts with other long-term phenomena, such as deterioration and fatigue. In this work, the time-dependent damage which is caused by elevated stress levels is analysed and modelled. A one-dimensional rheological model, which was calibrated on the results of an extensive experimental test campaign, is extended to a three-dimensional version. The time-dependent constitutive relations are implemented in a finite element code. The issues of triaxial stresses and mesh-dependency are addressed. In a first application, the model is used to simulate the long-term behaviour of a masonry tower. Secondly, the effects of time-dependent stress redistributions on the long-term stability of three-leaf masonry are investigated. © 2010 Elsevier Ltd.

Waly T.,UNESCO IHE | Kennedy M.D.,UNESCO IHE | Witkamp G.-J.,TUDelft | Amy G.,UNESCO IHE | And 2 more authors.
Desalination | Year: 2011

The pH of seawater reverse osmosis plants (SWRO) is the most influential parameter in determining the degree of supersaturation of CaCO3 in the concentrate stream. For this, the results of pH measurements of the concentrate of a seawater reverse osmosis pilot plant were compared with pH calculations based on the CO2-HCO3 --CO3 2- system equilibrium equations. Results were compared with two commercial software programs from membrane suppliers and also the software package Phreeqc. Results suggest that the real concentrate pH is lower than that of the feed and that none of the used programs was able to predict correctly real pH values. In addition, the effect of incorporating the acidity constant calculated for NaCl medium or seawater medium showed a great influence on the concentrate pH determination. The HCO3 - and CO3 2- equilibrium equation using acidity constants developed for seawater medium was the only method able to predict correctly the concentrate pH. The outcome of this study indicated that the saturation level of the concentrate was lower than previously anticipated. This was confirmed by shutting down the acid and the antiscalants dosing without any signs of scaling over a period of 12 months. © 2011 Elsevier B.V.

Hidders J.,TUDelft | Sroka J.,University of Warsaw | Missier P.,Newcastle University
SIGMOD Record | Year: 2013

This report summarizes the presentations and discussions of SWEET 2012, the First InternationalWorkshop on ScalableWorkflow Enactment Engines and Technologies. SWEET was held in conjunction with the 2012 SIGMOD conference in Scottsdale, Arizona, USA on May 20th, 2012. The goal of the workshop was to bring together researchers and practitioners to explore the state of the art in workflow-based programming for data-intensive applications, and the potential of cloud-based computing in this area. The program featured two very well attended invited talks by Pawel Garbacki from Google and Jimmy Lin from the University of Maryland, on leave at Twitter at the time, as well as a tutorial on Oozie, Yahoo's workflow engine based on Hadoop, by Mohammad Islam from Yahoo/Cloudera.

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