Purpose: The purpose of this study is to measure and compare the corporate reputation of four staffing and recruitment companies, from the perspective of graduating students. Background: Corporate reputation is a concept that has interested researchers for the last four decades, and still the concept incorporates a number of varied definitions, contexts and measurement methods (Gotsi & Wilson, 2001). Along with definition ambiguity comes also measurement concerns such as whether to aggregate or disaggregate several perspectives into one general index of a company’s reputation. Most researchers agree that corporate reputation is a suitable concept when describing the perceptions that stakeholders have of a company, and that it can only be ascribed to one company. This study takes the perspective to investigate one external stakeholder group of staffing and recruitment companies - graduating students. The group is of interest because it can possibly become an internal stakeholder group - employees. Method: For this study a quantitative method has been applied and an investigation has been made through a survey. Methodology about measuring corporate reputation is discussed, and lay ground for the empirical data collection. An altered version of the Harris-Fombrun Reputation Quotient (RQ) is used, in order to achieve better fit of the instrument and to attain higher reliability and validity. Conclusion: The purpose of this study has been fulfilled by measuring corporate reputation from the perspective of graduating students. empirical data from 125 students has been collected, and four corporate reputations of staffing and recruitment companies have been measured. The findings are not valid for generalisability but enough to give a good estimation of the population of interest. In addition, a disaggregated analysis of the RQ components has confirmed the findings. Using the methodology of the theoretically based Harris- Fombrun Reputation Quotient further validates the findings. Graduating students perceive Academic Work in the most positive way, in respect to the other companies. / Syfte: Syftet med denna studie är att mäta och jämföra anseendet av fyra bemannings- och rekryteringsföretag, utifrån avgångsstudenters perspektiv. Bakgrund: Företagets anseende är ett teoretiskt koncept som har intresserat forskare de senaste årtiondena och fortfarande råder delade meningar om definitioner, sammanhang och mätmetoder rörande konceptet (Gotsi & Wilson, 2001). Med tvetydiga definitioner kommer även oklarhet gällande mätningsmetod, som till exempel om man ska summera flera intressenters åsikter till ett övergripande index eller inte. Forskare är eniga om att företagets anseende är ett passande koncept när man ska beskriva de åsikter intressenter har om ett företag. Denna studie undersöker en specifik grupp av bemannings- och rekryteringsföretags externa intressenter, nämligen avgångsstudenter. Denna grupp är intressant då de kan komma att bli interna intressenter, via anställning av ett företag. Metod: Denna studie har en kvantitativ inriktning och undersökningen har utförts med hjälp av en enkät. Metodiken i att mäta företags anseende genom att använda sig av league tabeller och pilotstudier diskuteras och ligger till grund för empiriinsamling. Användandet av en anpassad version av Harris-Fombrun Reputation Quotient (RQ) ger studien ökad validitet och reliabilitet. Slutsats: Syftet med denna studie har blivit uppnått genom att mäta företagens anseende ur avgångsstudenters perspektiv. Empirisk data från 125 studenter har samlats ihop och fyra bemannings- och rekryteringsföretags företagsanseenden har blivit uppmätta. Resultatet kan inte generaliseras för en större population, men den kan användas för att ge en bra indikation hur åsikterna för den specifika populationen är. Vidare har en uppdelad analys av komponenterna i RQ gjorts vilket har kunnat säkerställa resultaten i den totala RQ. Användandet av den teoretiskt grundade RQ ger ytterligare validitet åt resultaten. Avgångsstudenter har mest positiva åsikter om Academic Work i jämförelse med de andra undersökta företagen.

Combined cycle power plants haven becoming one of the mainstream power plants in the twenty-one century. The emergence of high 600¢J exhaust temperature of the gas turbine, due to the recent rapid enhancement of aerospace material and blade cooling methods, upgrades the gas turbine from low efficiency dual pressure non-reheat unit to high efficiency triple pressure reheat combined cycle power plants. In addition, the increase of turbine inlet temperature by 10~15¢J every year leads to the renewal of the advanced models gas turbine less than ten years. There are three-turbine inlet temperature (TIT) definitions in the gas turbine: (1) TA defines firing temperature as the mass flow mean total temperature before the first-stage stationary diagram edge plane.( Westinghouse or MHI product) (2) TB defines fire temperature as the mass flow mean total temperature at the first-stage nozzle trailing edge plane, ( GE product). (3) TC defines ISO firing temperature; it is a stoichiometric combustion temperature. It is not a physical temperature. ( Siemens ¡® Alstom ABB product). This study shows how to calculate compressor inlet mass flow balance, turbine power balance and heat balance on the combustion chamber system. In order to prove correctness of the balance equation, the data are taken from the heat balance diagram and acceptance test of Nan-pu power station combined cycle. The result shows that the study is sultable for application of the optimum analysis for CCPP operation performance. This type of combined cycle power plant suits not only for the base-load but also for the cycling-load operation.

<p>Purpose: The purpose of this study is to measure and compare the corporate reputation of four staffing and recruitment companies, from the perspective of graduating students.</p><p>Background: Corporate reputation is a concept that has interested researchers for the last four decades, and still the concept incorporates a number of varied definitions, contexts and measurement methods (Gotsi & Wilson, 2001). Along with definition ambiguity comes also measurement concerns such as whether to aggregate or disaggregate several perspectives into one general index of a company’s reputation. Most researchers agree that corporate reputation is a suitable concept when describing the perceptions that stakeholders have of a company, and that it can only be ascribed to one company. This study takes the perspective to investigate one external stakeholder group of staffing and recruitment companies - graduating students. The group is of interest because it can possibly become an internal stakeholder group - employees.</p><p>Method: For this study a quantitative method has been applied and an investigation has been made through a survey. Methodology about measuring corporate reputation is discussed, and lay ground for the empirical data collection. An altered version of the Harris-Fombrun Reputation Quotient (RQ) is used, in order to achieve better fit of the instrument and to attain higher reliability and validity.</p><p>Conclusion: The purpose of this study has been fulfilled by measuring corporate reputation from the perspective of graduating students. empirical data from 125 students has been collected, and four corporate reputations of staffing and recruitment companies have been measured. The findings are not valid for generalisability but enough to give a good estimation of the population of interest. In addition, a disaggregated analysis of the RQ components has confirmed the findings. Using the methodology of the theoretically based Harris- Fombrun Reputation Quotient further validates the findings. Graduating students perceive Academic Work in the most positive way, in respect to the other companies.</p> / <p>Syfte: Syftet med denna studie är att mäta och jämföra anseendet av fyra bemannings- och rekryteringsföretag, utifrån avgångsstudenters perspektiv.</p><p>Bakgrund: Företagets anseende är ett teoretiskt koncept som har intresserat forskare de senaste årtiondena och fortfarande råder delade meningar om definitioner, sammanhang och mätmetoder rörande konceptet (Gotsi & Wilson, 2001). Med tvetydiga definitioner kommer även oklarhet gällande mätningsmetod, som till exempel om man ska summera flera intressenters åsikter till ett övergripande index eller inte. Forskare är eniga om att företagets anseende är ett passande koncept när man ska beskriva de åsikter intressenter har om ett företag. Denna studie undersöker en specifik grupp av bemannings- och rekryteringsföretags externa intressenter, nämligen avgångsstudenter. Denna grupp är intressant då de kan komma att bli interna intressenter, via anställning av ett företag.</p><p>Metod: Denna studie har en kvantitativ inriktning och undersökningen har utförts med hjälp av en enkät. Metodiken i att mäta företags anseende genom att använda sig av league tabeller och pilotstudier diskuteras och ligger till grund för empiriinsamling. Användandet av en anpassad version av Harris-Fombrun Reputation Quotient (RQ) ger studien ökad validitet och reliabilitet.</p><p>Slutsats: Syftet med denna studie har blivit uppnått genom att mäta företagens anseende ur avgångsstudenters perspektiv. Empirisk data från 125 studenter har samlats ihop och fyra bemannings- och rekryteringsföretags företagsanseenden har blivit uppmätta. Resultatet kan inte generaliseras för en större population, men den kan användas för att ge en bra indikation hur åsikterna för den specifika populationen är. Vidare har en uppdelad analys av komponenterna i RQ gjorts vilket har kunnat säkerställa resultaten i den totala RQ. Användandet av den teoretiskt grundade RQ ger ytterligare validitet åt resultaten. Avgångsstudenter har mest positiva åsikter om Academic Work i jämförelse med de andra undersökta företagen.</p>

Several factors have contributed to impeding the progress of migratory waterfowl spatial modeling, such as (1) waterfowl’s reliance on wetlands, (2) lack of understanding about shifts in distributions through time, and (3) large-scale seasonal migration. This doctoral dissertation provides an array of tools to address each of these concerns in order to better understand and conserve this group of species. The second chapter of this dissertation addresses issues of modeling species dependent on wetlands, a dynamic and often ephemeral habitat type. Correlation models of the relationships between climatic variables and species occurrence will not capture the full habitat constraints of waterfowl. This study introduces a novel data source that explicitly models the depth to water table, which is a simulated long-term measure of the point where climate and geological/topographic water fluxes balance. The inclusion of the depth to water table data contributes significantly to the ability to predict species probability of occurrence. Furthermore, this data source provides advantages over traditional proxies for wetland habitat, because it is not a static measure of wetland location, and is not biased by sampling method. Utilizing the long-term banding bird data again, the third chapter examines the behavior of waterfowl niche selection through time. By using the methods developed in chapter two, probability of occurrence models for the 1950s and the 1990s were developed. It was then possible to detect movements in geographic and environmental space, and how movements in these two spaces are related. This type of analysis provides insight into how different bird species might respond to environment changes and potentially improve climate change forecasts. The final chapter presents a new method for predicting the migratory movement of waterfowl. The method incorporates not only the environmental constraints of stopover habitat, but also includes likely distance and bearing traveled from a source point. This approach uses the USGS’ banding bird database; more specifically, it relies on banding locations, which have multiple recoveries within short time periods. Models made from these banding locations create a framework of migration movement, and allow for predictions to be made from locations where no banding/recovery data are available. / text

Στη παρούσα εργασία, δημιουργήθηκε ένα εκπαιδευτικό περιβάλλον εικονικής πραγματικότητας για προσομοίωση σεισμού σε σχολική τάξη. Πρόκειται για ένα ασφαλές περιβάλλον, εφικτού κόστους, που προσομοιώνει αρκετά καλά το φυσικό. Παρουσιάζεται ο τρόπος κατασκευής των αντικειμένων της τάξης με τη χρήση λογισμικού μοντελοποίησης και η δημιουργία διαφόρων συμβάντων που λαμβάνουν χώρα κατά τη διάρκεια του σεισμού, με τη χρήση λογισμικού εικονικής πραγματικότητας. Η εφαρμογή δίνει τη δυνατότητα στο μαθητή να αποκτήσει ψυχολογική εξοικείωση και να ενισχύσει την αντιληπτικότητά του σχετικά με το φαινόμενο, να βελτιώσει την απόδοσή του αποκομίζοντας καινούργιες εμπειρίες και ταυτόχρονα να εφαρμόζει όσα έχει μάθει για τους τρόπους αντίδρασης σε περίπτωση σεισμού σε συνθήκες πραγματικού γεγονότος. / An educational environment of virtual reality was designed in order to simulate an earthquake occurring while students are present in a classroom. Such a virtual environment has many advantages: it is secure for students, not costly and very similar to the real life one that is to the actual classroom in the sense that students are free to interact within its confines. The present dissertation attempts to present the ways through which school elements can be produced using a modelling tool. Additionally, we have created a variety of incidents taking place while the earthquake is occurring using a virtual reality software. Summing up, this application offers students the opportunity to psychologically familiarize themselves with the phenomenon of an earthquake while at the same time reinforces their awareness of it. It offers students the possibility to acquire new experiences and improve their performance in crisis management (e.g. earthquake), and it simultaneously sets while an example-environment to apply their theoretical knowledge in real life situations.

Μέχρι σήμερα δεν έχει γίνει καμία προσπάθεια σύνδεσης της τεχνικής εκπαίδευσης με την αγορά εργασίας. Για το λόγο αυτό, στόχος της διατριβής είναι η διερεύνηση της απασχόλησης των αποφοίτων σε θέσεις εργασίας που έχουν άμεση σχέση με τις σπουδές τους, δηλαδή η αντιστοίχιση της εκπαίδευσης με την απασχόληση. Η έρευνα(ποιοτική και ποσοτική)αναπτύχθηκε στους Νομούς Θεσσαλονίκης και Αχαϊας και βασίστηκε σε δομημένο ερωτηματολόγιο. Από την έρευνα που πραγματοποιήθηκε διαπιστώθηκαν, μεταξύ άλλων, και τα εξής: η ανεργία μεταξύ των αποφοίτων είναι πολύ υψηλή εφόσον σε μεγάλο ποσοστό εργοδοτών τα πτυχία των αποφοίτων δεν αντιπροσωπεύουν τίποτα. Επιπλέον, οι απόφοιτοι δηλώνουν ότι μέχρι σήμερα ετεροαπασχολούνται σε εργασίες άσχετες με την εκπαίδευσή τους, ενώ πολλοί είναι και εκείνοι που δεν έχουν εργασθεί ποτέ, επειδή δε βρίσκουν καμία εργασία στην ειδικότητά τους ή σε άλλη ειδικότητα. Τα συμπεράσματα της έρευνας δίνουν έναυσμα για τη διατύπωση προτάσεων που θα συμβάλλουν στην επίλυση του προβλήματος της ανεργίας των αποφοίτων της τεχνικής εκπαίδευσης,όπως η ανανέωση των προγραμμάτων σπουδών, και η εφαρμογή πρακτικής άσκησης των μαθητών σε επιχειρήσεις, η οποία μπορεί να επιτευχθεί μόνο μέσω της ουσιαστικής αρωγής της ουσιαστικής αρωγής της πολιτείας. / Until today, it has not been made any effort to connect the vocational education with labour market. For this reason, the aim of the thesis is the examination of the employment of graduates in job positions that are directly ralated with their studies, which means matching and schooling. The research (qualitive and quantitive) was developed in Prefecture of Thessaloniki and Achaia and was based on a strustured questionnaire. The results of the research, among others, are the following: The unemployment level is very high among the graduates, by the time that a great percentage of employers do not recognize their diplomas. Moreover, almost half of the graduates declare that until today they are employed in jobs, irrelevant to their education, while many others have never been employed because they could not find any job in their speciality or in any else. The conclusions of the research can be taken as a suggestion for the solution of unemployment problem of graduates of vocational education, like the renewal of time- tables and application of practice of students in enteprices, that can be achieved only through the essential help of public sector.

Darbo tikslas - Palyginti Lietuvos ir Rusijos maisto produktų sudėties lenteles. Tyrimo metodika. Maisto produktų ir patiekalų, įtrauktų į Lietuvos ir Rusijos maisto produktų sudėties lenteles, palyginimui buvo analizuojama 23 maisto produktų ir 34 patiekalų maistinė sud��tis. Šiame darbe atlikta 25-64 metų 100 Kretingos rajono gyventojų (66 moterys, 34 vyrai), atsitiktinai atrinktų iš Pirminės sveikatos priežiūros centrų sąrašų, kurie 1999 m. dalyvavo Lėtinių neinfekcinių ligų integruotos profilaktikos programoje, mitybos tyrimo duomenų analizė. Mityba buvo tiriama 24 val. apklausos metodu. Suvartoti maisto medžiagų ir energijos kiekiai buvo apskaičiuoti, naudojant Lietuvos ir Rusijos maisto produktų sudėties lenteles. Gautos dvi rezultatų grupės buvo palygintos taikant Vilkoksono (Wilcoxon) kriterijų. Maisto davinio energijos dalių, gautų iš pagrindinių maisto medžiagų, proporcijų palyginimui, buvo taikomas Z testas. Rezultatai. Lyginant pagrindinių maisto medžiagų ir energijos kiekius maisto produktuose ir patiekaluose, įtrauktuose į Lietuvos ir Rusijos maisto produktų sudėties lenteles, nustatyta, kad daugumos maisto produktų ir patiekalų sudėtis skyrėsi. Nustatyti statistiškai reikšmingi baltymų, riebalų, angliavandenių, cukrų, skaidulinių medžiagų, natrio, magnio, fosforo, geležies, vitamino A, vitamino B1, vitamino B2, vitamino PP kiekių ir energinės vertės skirtumai. Labiausiai skyrėsi vitamino A, maistinių skaidulų ir geležies kiekiai. Naudojant Rusijos maisto... [toliau žr. visą tekstą] / The aim of the study – To compare Lithuanian food composition table and Russian food composition table. Methods. For comparison of the Lithuanian and Russian food composition tables, the alimentary structure of 23 alimentary products and 34 meals was analyzed. The analysis of the data of the nutrition research was performed at this work for 100 inhabitants of the Kretinga district aged 25-64 (66 women, 34 men). These respondents were selected from registers of the Kretinga Primary Health care centers. The nutrition was researched by 24 hours dietary recall method. Nutrient and energy intake was calculated by using Lithuanian food composition table and Russian food composition table. The two sets of the results were compared according to the criterion of Wilcoxon. Z test was used to compare the proportions of the energy parts of the alimentary ration received from the main nutrients. Results. By comparing the amounts of the main nutrients and energy in the alimentary products and meals in the Lithuanian and Russian tables, it was established that the structure of the most alimentary products and meals was different. After evaluating the structure of the alimentary ration according to the Lithuanian and Russian tables, statistically significant differences of the amounts of proteins, fats, carbohydrates, sugars, fiber materials, sodium, magnesium, phosphor, iron, the vitamin A, the vitamin B1, the vitamin B2, the vitamin PP and the energetic value were found. By using Russian... [to full text]

Cette thèse porte sur l’évaluation de la cohérence du réseau conceptuel démontré par des étudiants de niveau collégial inscrits en sciences de la nature. L’évaluation de cette cohérence s’est basée sur l’analyse des tableaux de Burt issus des réponses à des questionnaires à choix multiples, sur l’étude détaillée des indices de discrimination spécifique qui seront décrits plus en détail dans le corps de l’ouvrage et sur l’analyse de séquences vidéos d’étudiants effectuant une expérimentation en contexte réel. Au terme de ce projet, quatre grands axes de recherche ont été exploré. 1) Quelle est la cohérence conceptuelle démontrée en physique newtonienne ? 2) Est-ce que la maîtrise du calcul d’incertitude est corrélée au développement de la pensée logique ou à la maîtrise des mathématiques ? 3) Quelle est la cohérence conceptuelle démontrée dans la quantification de l’incertitude expérimentale ? 4) Quelles sont les procédures concrètement mise en place par des étudiants pour quantifier l’incertitude expérimentale dans un contexte de laboratoire semi-dirigé ? Les principales conclusions qui ressortent pour chacun des axes peuvent se formuler ainsi. 1) Les conceptions erronées les plus répandues ne sont pas solidement ancrées dans un réseau conceptuel rigide. Par exemple, un étudiant réussissant une question sur la troisième loi de Newton (sujet le moins bien réussi du Force Concept Inventory) montre une probabilité à peine supérieure de réussir une autre question sur ce même sujet que les autres participants. De nombreux couples de questions révèlent un indice de discrimination spécifique négatif indiquant une faible cohérence conceptuelle en prétest et une cohérence conceptuelle légèrement améliorée en post-test. 2) Si une petite proportion des étudiants ont montré des carences marquées pour les questions reliées au contrôle des variables et à celles traitant de la relation entre la forme graphique de données expérimentales et un modèle mathématique, la majorité des étudiants peuvent être considérés comme maîtrisant adéquatement ces deux sujets. Toutefois, presque tous les étudiants démontrent une absence de maîtrise des principes sous-jacent à la quantification de l’incertitude expérimentale et de la propagation des incertitudes (ci-après appelé métrologie). Aucune corrélation statistiquement significative n’a été observée entre ces trois domaines, laissant entendre qu’il s’agit d’habiletés cognitives largement indépendantes. Le tableau de Burt a pu mettre en lumière une plus grande cohérence conceptuelle entre les questions de contrôle des variables que n’aurait pu le laisser supposer la matrice des coefficients de corrélation de Pearson. En métrologie, des questions équivalentes n’ont pas fait ressortir une cohérence conceptuelle clairement démontrée. 3) L’analyse d’un questionnaire entièrement dédié à la métrologie laisse entrevoir des conceptions erronées issues des apprentissages effectués dans les cours antérieurs (obstacles didactiques), des conceptions erronées basées sur des modèles intuitifs et une absence de compréhension globale des concepts métrologiques bien que certains concepts paraissent en voie d’acquisition. 4) Lorsque les étudiants sont laissés à eux-mêmes, les mêmes difficultés identifiées par l’analyse du questionnaire du point 3) reviennent ce qui corrobore les résultats obtenus. Cependant, nous avons pu observer d’autres comportements reliés à la mesure en laboratoire qui n’auraient pas pu être évalués par le questionnaire à choix multiples. Des entretiens d’explicitations tenus immédiatement après chaque séance ont permis aux participants de détailler certains aspects de leur méthodologie métrologique, notamment, l’emploi de procédures de répétitions de mesures expérimentales, leurs stratégies pour quantifier l’incertitude et les raisons sous-tendant l’estimation numérique des incertitudes de lecture. L’emploi des algorithmes de propagation des incertitudes a été adéquat dans l’ensemble. De nombreuses conceptions erronées en métrologie semblent résister fortement à l’apprentissage. Notons, entre autres, l’assignation de la résolution d’un appareil de mesure à affichage numérique comme valeur de l’incertitude et l’absence de procédures d’empilement pour diminuer l’incertitude. La conception que la précision d’une valeur numérique ne peut être inférieure à la tolérance d’un appareil semble fermement ancrée. / This thesis evaluates the coherence of the conceptual network demonstrated by college students in life and applied sciences. This evaluation was based on the analysis of Burt tables issuing from multiple choice questionnaires, on the creation and careful examination of a novel tool, the matrix of specific discrimination coefficients, which will be described in the main text, and on the qualitative analysis of actual laboratory work of students doing an experimentation. At the completion of this project, four research axis have been explored. 1) What is the conceptual coherence demonstrated in Newtonian mechanics? 2) Is the mastery of uncertainty quantification related to the development of logical thinking or to mathematical competency? 3) What is the conceptual coherence demonstrated in the quantification of experimental uncertainty? 4) What are the concrete procedures utilized by students to quantify experimental uncertainty in a semi-directed laboratory context? The main conclusions that emerged from each axis of research can be summerized as follow. 1) The most prevalent erroneous conceptions are not solidly set in a rigid conceptual network. For example, a student successful in a question about Newton’s third law (the most difficult subject of the Force Concept Inventory) is just slightly more likely to succeed in another related question than the other participants. Many pairs of questions displays a negative specific discrimination coefficient demonstrating a weak conceptual coherence in pre-test and a somewhat ameliorated conceptual coherence in post-test. 2) If a small proportion of students has demonstrated marked deficiencies in questions related with control of variable and in those related to the relationship between the graphical display of experimental data and a mathematical model, the majority of students can be considered as adequately mastering those subjects. However, almost every student demonstrated a lack of mastery of concepts underlying the quantification of experimental uncertainty and the propagation of uncertainty (heretofore referred to as metrology). No statistically significant correlation has been observed between the three main topics suggesting that they are largely independent cognitive abilities. Burt table has demonstrated a greater degree of conceptual coherence between control of variables questions than suggested by Pearson correlation coefficients. Equivalent question in the topic of metrology did not permit to demonstrate a clear conceptual coherence. 3) Analysis of a questionnaire entirely devoted to metrology has shown erroneous conceptions caused by prior learning (didactical obstacles), erroneous conceptions based on intuitive models and a lack of global comprehension of metrological concepts although some appear to be almost acquired. 4) When doing real experiments in semi-directed laboratory, students demonstrated the same difficulty identified in the questionnaire of 3) which could interpreted as corroborating previously obtaine results. However, many unanticipated behaviors related to measurement were observed that could not have been anticipated solely by analyzing answers in the multiple-choice questionnaire. Interviews immediately following each semi-directed laboratory permitted the participants to detail certain aspects of their metrological methodology. Most notably, the use of repeated measurement strategies, their « spontaneous » strategies to quantify uncertainty, and their explanation of numerical estimates of reading uncertainties. Overall, uncertainty propagation algorithms were adequately employed. Many erroneous metrological conceptions seem to resist strongly to be modified by learning. Among others, assignation of the resolution of a digital scale as the uncertainty value and the lack of stacking strategies to diminish uncertainty. The conception that a numerical value cannot be more precise than the tolerance of an instrument seems firmly set.

Orientador: Nobuo Oki / Resumo: A utilização de redes de comunicação sem fio deixou de ser uma ferramenta opcional para tornar-se uma necessidade no monitoramento de residências, automóveis, controles de processos automatizados e comunicação entre as pessoas. Tratando-se de redes de transdutores cabeadas, as redes CAN (Controller Area Network) são utilizadas em automóveis modernos, instrumentação médica, em veículos táticos, na automação de processos, no transporte metropolitano e em sistemas de controle de fábricas. A maioria das estruturas críticas de sistemas de controle fazem uso do CAN em algum ponto na rede, para conectar sensores que se encontram distantes e controlar atuadores de um sistema, ou para conectar vários controladores que utilizam uma interface em comum. O padrão sem fio, IEEE 802.15.4, comercialmente conhecido como “ZigBee”, foi projetado para operar em baixas taxas de dados, com segurança e facilidade de configurações de rede. Esta tese tem como objetivo desenvolver um sistema heterogêneo utilizando microcontroladores ATMEGA em que, o modelo do protocolo CAN e o padrão IEEE 802.15.4 estejam acoplados. Este módulo será capaz de gerenciar e monitorar sensores e atuadores utilizando CAN e, através do padrão sem fio 802.15.4, comunicar-se com os outros módulos da rede. O interfaceamento entre os pacotes da rede de controle de área (CAN) com a rede ZigBee é realizado através da implementação de tabelas de dispersão (Hash Tables) para o gerenciamento e otimização da memória utilizada. As anál... (Resumo completo, clicar acesso eletrônico abaixo) / Doutor

La conception des bibliothèques d’évaluation de fonctions est un activité complexe qui requiert beaucoup de soin et d’application, particulièrement lorsque l’on vise des niveaux élevés de fiabilité et de performances. En pratique et de manière habituelle, on ne peut se livrer à ce travail sans disposer d’outils qui guident le concepteur dans le dédale d’un espace de solutions étendu et complexe mais qui lui garantissent également la correction et la quasi-optimalité de sa production. Dans l’état actuel de l’art, il nous faut encore plutôt raisonner en termes de « boite à outils » d’où le concepteur doit tirer et combiner des mécanismes de base, au mieux de ses objectifs, plutôt qu’imaginer que l’on dispose d’un dispositif à même de résoudre automatiquement tous les problèmes.Le présent travail s’attache à la conception et la réalisation de tels outils dans deux domaines:∙ la consolidation du test d’arrondi de Ziv utilisé, jusqu’à présent de manière plus ou moins empirique, dans l’implantation des approximations de fonction ;∙ le développement d’une implantation de l’algorithme SLZ dans le but de résoudre le « Dilemme du fabricant de table » dans le cas de fonctions ayant pour opérandes et pour résultat approché des nombres flottants en quadruple précision (format Binary64 selon la norme IEEE-754). / The design of function evaluation libraries is a complex task that requires a great care and dedication, especially when one wants to satisfy high standards of reliability and performance. In actual practice, it cannot be correctly performed, as a routine operation, without tools that not only help the designer to find his way in a complex and extended solution space but also to guarantee that his solutions are correct and (almost) optimal. As of the present state of the art, one has to think in terms of “toolbox” from which he can smartly mix-and-match the utensils that fit better his goals rather than expect to have at hand a solve-all automatic device.The work presented here is dedicated to the design and implementation of such tools in two realms:∙ the consolidation of Ziv’s rounding test that is used, in a more or less empirical way, for the implementation of functions approximation;∙ the development of an implementation of the SLZ-algorithm in order to solve the Table Maker Dilemma for the function with quad-precision floating point (IEEE-754 Binary128 format) arguments and images.