This paper describes an analytical technique for prediction of open circuit eddy-current loss in ... more This paper describes an analytical technique for prediction of open circuit eddy-current loss in armature windings and permanent magnets (PM) of series double excitation synchronous machines. First, a 2-D exact analytical solution of open circuit magnetic field distribution in idealized geometry of series double excitation synchronous machine is established. It involves solving Maxwell's equations in stator slots, air gap, PM region, and rotor slots. Then, magnetic vector potential solutions in the stator slots and PM regions are respectively used for prediction of resistance limited eddy currents in armature windings and permanent magnets. This analytical model is then used to estimate eddy-current loss in armature windings and permanent magnets. The validity of the developed model, which is also applicable to conventional designs of permanent-magnet machine, is verified by time-stepped transient finite-element analysis (FEA). The developed model is then used to quantify the effectiveness of segmenting the magnets and armature windings in reducing the eddy-current loss.
Managing multilingual documents is a time consuming, error prone and expensive task, particularly... more Managing multilingual documents is a time consuming, error prone and expensive task, particularly when dealing with dynamic documents such as web contents. A broad spectrum of organizations such as corporations, NGO’s and Governments are committed to offer such documents in a number of languages where the content is further localized to suit specific cultural settings. In this paper, we propose a business model supported by a web services-enabled framework, which facilitate all aspects related to multilingual web contents management, from negotiating translation-request quotations through production of final localized output as well as its verification, and delivery. This service is based on a collaborative internet-based translation framework, referred to in this paper as Translation Management System (TMS). Our approach uses XLIFF, a Web service standard developed by OASIS, in order to interoperate enterprise translation services and related Web applications. We present and implement a translation business model centered around standardized processes, which we validate through a case study in the context of a Web translation project. We also propose a QoS monitoring model to satisfy the quality-related requirements of a translation job. Finally, we evaluate the usability of our streamlined Web translation services through users’ perception in terms of flexibility, ease of use, and quality of translation. The results revealed interesting performance tradeoffs relative to translation workflows and content-translation accuracy as well as flexibility, and diversity of TMS provided services.
In this paper, we propose a new probabilistic approach designed for supervised classification of ... more In this paper, we propose a new probabilistic approach designed for supervised classification of natural objects (vegetal and mineral) in high resolution aerial pictures. It consists of a two layered hidden Markov models (HMM) based approach which takes into account the spatial correlations between natural objects. The performance of our approach has been tested on real world high resolution aerial pictures, and the obtained results demonstrated its effectiveness compared to those presented in the literature.
... ON THE APPLICATION OF CHIRP MODULATION IN SPREAD SPECTRUM COMMUNICATION SYSTEMS Yacine Sarni,... more ... ON THE APPLICATION OF CHIRP MODULATION IN SPREAD SPECTRUM COMMUNICATION SYSTEMS Yacine Sarni, Rabah Sadoun and Adel Belouchrani ... Empi,hxl No Interference the chirp sweep from 0.62 rad to 7r every bit interval with an SIR of -20 dB. Figure. ...
This paper presents an architecture along with an implementation approach to build efficient e-le... more This paper presents an architecture along with an implementation approach to build efficient e-learning applications.
Administering multilingual Web sites and applications reliably, involves interconnected and multi... more Administering multilingual Web sites and applications reliably, involves interconnected and multipart tasks, where trust in the involved parties and content translation sources is paramount. Published Web sites may reflect content from databases, content management systems and other repositories to manage related Web content. But a Web site mirrored wholly or selectively onto a target language version requires streamlined trusted processes. Traditionally, files are translated and transferred via FTP, e-mail, or other communication means. Similarly, translation instructions are communicated between involved parties through verbal instruction, e-mail, and instruction files lead to a variety of inconsistencies and lack of trust in the translation process. This paper proposes a Web service approach to streamline the translation processes and an integration of trust properties in the proposed translation Web services. Web Services have been instrumental in handling problems inherent to systems integration, allowing web-based systems to converse and communicate data automatically. The OASIS Translation Web Services Technical Committee has released a standard way for Web Services to serve the translation and localization business. This article proposes a framework to centralize translation services at a reputable source providing a workflow and a mechanism to quantify service trust. An implementation of the framework is also described in the context of a localization case study.
The LHC has two dedicated cleaning insertions: IR3 for momentum cleaning and IR7 for betatron cle... more The LHC has two dedicated cleaning insertions: IR3 for momentum cleaning and IR7 for betatron cleaning. The collimation system has been specified and built with tight mechanical tolerances (e.g. jaw flatness ∼ 40 μm ) and is designed to achieve a high accuracy and reproducibility of the jaw positions (∼ 20 μm). The practically achievable cleaning efficiency of the present Phase-I system depends on the precision of the jaw centering around the beam, the accuracy of the gap size and the jaw parallelism against the beam. The reproducibility and stability of the collimation system is important to avoid the frequent repetition of beam based alignment which is currently a lengthy procedure. Within this paper we describe the method used for the beam based alignment of the LHC collimation system, its achieved accuracy and stability and its performance at 450 GeV.
Tthis paper describes an IPTV solution provided by mobile operators. This approach is based on th... more Tthis paper describes an IPTV solution provided by mobile operators. This approach is based on the IP Multimedia Subsystem (IMS) which is used for controlling and charging the offered services. The architecture provided here is generic in the sense that various access ...
This paper presents an analytical solution for prediction of the armature reaction magnetic field... more This paper presents an analytical solution for prediction of the armature reaction magnetic field in slotted surface mounted permanent magnet radial flux synchronous machines. This technique is used in the case of internal and external rotor radial-field machines. The magnetic field expressions are developed in both slots regions and magnetic airgap region leading to an exact calculation of the effects of slotting on the airgap magnetic quantities. Results from this analytical model are compared to corresponding finite element analyses. This analytical model is then used to estimate the self and mutual inductances.
Tasks scheduling is one of the most important challenges in embedded hard-real-time systems. The ... more Tasks scheduling is one of the most important challenges in embedded hard-real-time systems. The problem is known to be NP-Hard and exhaustive search algorithms have no significant benefit in large-scale context. This paper proposes a scatter search based approach for mono-processor systems with timing, precedence and exclusion constraints with no preemption. An empirical study is undertaken and comparison is done with results of previous works.
This paper presents a multi-slice analytical model for prediction of the open-circuit magnetic fi... more This paper presents a multi-slice analytical model for prediction of the open-circuit magnetic field in slotted semi-closed permanent-magnet axial flux synchronous machines. The technique is based on 2-D exact solution of the Maxwell's equations using the separation of variables method. The magnetic field expressions are developed in slots regions, slot opening regions, magnetic air gap regions, and permanent magnet regions leading to an exact calculation of the slot effects on the air gap magnetic field. The model is established considering that ferromagnetic parts are infinitely permeable, and end effects at inner and outer radii are neglected. The open circuit machine's global quantities (electromotive force and cogging torque) are then deduced from the local magnetic field expressions. Finally, the accuracy of the presented analytical model is validated by comparing its results to corresponding finite-element analyses for two different axial flux machines.
This paper describes an analytical technique for prediction of open circuit eddy-current loss in ... more This paper describes an analytical technique for prediction of open circuit eddy-current loss in armature windings and permanent magnets (PM) of series double excitation synchronous machines. First, a 2-D exact analytical solution of open circuit magnetic field distribution in idealized geometry of series double excitation synchronous machine is established. It involves solving Maxwell's equations in stator slots, air gap, PM region, and rotor slots. Then, magnetic vector potential solutions in the stator slots and PM regions are respectively used for prediction of resistance limited eddy currents in armature windings and permanent magnets. This analytical model is then used to estimate eddy-current loss in armature windings and permanent magnets. The validity of the developed model, which is also applicable to conventional designs of permanent-magnet machine, is verified by time-stepped transient finite-element analysis (FEA). The developed model is then used to quantify the effectiveness of segmenting the magnets and armature windings in reducing the eddy-current loss.
Managing multilingual documents is a time consuming, error prone and expensive task, particularly... more Managing multilingual documents is a time consuming, error prone and expensive task, particularly when dealing with dynamic documents such as web contents. A broad spectrum of organizations such as corporations, NGO’s and Governments are committed to offer such documents in a number of languages where the content is further localized to suit specific cultural settings. In this paper, we propose a business model supported by a web services-enabled framework, which facilitate all aspects related to multilingual web contents management, from negotiating translation-request quotations through production of final localized output as well as its verification, and delivery. This service is based on a collaborative internet-based translation framework, referred to in this paper as Translation Management System (TMS). Our approach uses XLIFF, a Web service standard developed by OASIS, in order to interoperate enterprise translation services and related Web applications. We present and implement a translation business model centered around standardized processes, which we validate through a case study in the context of a Web translation project. We also propose a QoS monitoring model to satisfy the quality-related requirements of a translation job. Finally, we evaluate the usability of our streamlined Web translation services through users’ perception in terms of flexibility, ease of use, and quality of translation. The results revealed interesting performance tradeoffs relative to translation workflows and content-translation accuracy as well as flexibility, and diversity of TMS provided services.
In this paper, we propose a new probabilistic approach designed for supervised classification of ... more In this paper, we propose a new probabilistic approach designed for supervised classification of natural objects (vegetal and mineral) in high resolution aerial pictures. It consists of a two layered hidden Markov models (HMM) based approach which takes into account the spatial correlations between natural objects. The performance of our approach has been tested on real world high resolution aerial pictures, and the obtained results demonstrated its effectiveness compared to those presented in the literature.
... ON THE APPLICATION OF CHIRP MODULATION IN SPREAD SPECTRUM COMMUNICATION SYSTEMS Yacine Sarni,... more ... ON THE APPLICATION OF CHIRP MODULATION IN SPREAD SPECTRUM COMMUNICATION SYSTEMS Yacine Sarni, Rabah Sadoun and Adel Belouchrani ... Empi,hxl No Interference the chirp sweep from 0.62 rad to 7r every bit interval with an SIR of -20 dB. Figure. ...
This paper presents an architecture along with an implementation approach to build efficient e-le... more This paper presents an architecture along with an implementation approach to build efficient e-learning applications.
Administering multilingual Web sites and applications reliably, involves interconnected and multi... more Administering multilingual Web sites and applications reliably, involves interconnected and multipart tasks, where trust in the involved parties and content translation sources is paramount. Published Web sites may reflect content from databases, content management systems and other repositories to manage related Web content. But a Web site mirrored wholly or selectively onto a target language version requires streamlined trusted processes. Traditionally, files are translated and transferred via FTP, e-mail, or other communication means. Similarly, translation instructions are communicated between involved parties through verbal instruction, e-mail, and instruction files lead to a variety of inconsistencies and lack of trust in the translation process. This paper proposes a Web service approach to streamline the translation processes and an integration of trust properties in the proposed translation Web services. Web Services have been instrumental in handling problems inherent to systems integration, allowing web-based systems to converse and communicate data automatically. The OASIS Translation Web Services Technical Committee has released a standard way for Web Services to serve the translation and localization business. This article proposes a framework to centralize translation services at a reputable source providing a workflow and a mechanism to quantify service trust. An implementation of the framework is also described in the context of a localization case study.
The LHC has two dedicated cleaning insertions: IR3 for momentum cleaning and IR7 for betatron cle... more The LHC has two dedicated cleaning insertions: IR3 for momentum cleaning and IR7 for betatron cleaning. The collimation system has been specified and built with tight mechanical tolerances (e.g. jaw flatness ∼ 40 μm ) and is designed to achieve a high accuracy and reproducibility of the jaw positions (∼ 20 μm). The practically achievable cleaning efficiency of the present Phase-I system depends on the precision of the jaw centering around the beam, the accuracy of the gap size and the jaw parallelism against the beam. The reproducibility and stability of the collimation system is important to avoid the frequent repetition of beam based alignment which is currently a lengthy procedure. Within this paper we describe the method used for the beam based alignment of the LHC collimation system, its achieved accuracy and stability and its performance at 450 GeV.
Tthis paper describes an IPTV solution provided by mobile operators. This approach is based on th... more Tthis paper describes an IPTV solution provided by mobile operators. This approach is based on the IP Multimedia Subsystem (IMS) which is used for controlling and charging the offered services. The architecture provided here is generic in the sense that various access ...
This paper presents an analytical solution for prediction of the armature reaction magnetic field... more This paper presents an analytical solution for prediction of the armature reaction magnetic field in slotted surface mounted permanent magnet radial flux synchronous machines. This technique is used in the case of internal and external rotor radial-field machines. The magnetic field expressions are developed in both slots regions and magnetic airgap region leading to an exact calculation of the effects of slotting on the airgap magnetic quantities. Results from this analytical model are compared to corresponding finite element analyses. This analytical model is then used to estimate the self and mutual inductances.
Tasks scheduling is one of the most important challenges in embedded hard-real-time systems. The ... more Tasks scheduling is one of the most important challenges in embedded hard-real-time systems. The problem is known to be NP-Hard and exhaustive search algorithms have no significant benefit in large-scale context. This paper proposes a scatter search based approach for mono-processor systems with timing, precedence and exclusion constraints with no preemption. An empirical study is undertaken and comparison is done with results of previous works.
This paper presents a multi-slice analytical model for prediction of the open-circuit magnetic fi... more This paper presents a multi-slice analytical model for prediction of the open-circuit magnetic field in slotted semi-closed permanent-magnet axial flux synchronous machines. The technique is based on 2-D exact solution of the Maxwell's equations using the separation of variables method. The magnetic field expressions are developed in slots regions, slot opening regions, magnetic air gap regions, and permanent magnet regions leading to an exact calculation of the slot effects on the air gap magnetic field. The model is established considering that ferromagnetic parts are infinitely permeable, and end effects at inner and outer radii are neglected. The open circuit machine's global quantities (electromotive force and cogging torque) are then deduced from the local magnetic field expressions. Finally, the accuracy of the presented analytical model is validated by comparing its results to corresponding finite-element analyses for two different axial flux machines.
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