The main topic of this master´s thesis is a practical simulation of wireless mobile networks. For this purpose, the model simulating urban enviroment in which mobile nodes move according to desgined trajectories was created. The parameters of transmitted signal and impact of obstacles in the way of propagation were examined by the simulation. Number of obstacles and type of material of given obstacle was taken into consideration.

This thesis consists of theoretical and practical parts. The theoretical part contains an analysis of the problems of wireless networkssolutions individual standards and methodologies to ensure quality of service. In the practical part using the OPNET Modeler, a number of different simulation models and their evaluation. It is a model of individual standards, support mobility and interference effects on quality of service.

The doctoral thesis is focused on a research in the area of the quality-of-service support technologies in data networks. The current modern communication networks cannot operate correctly without an effective tool allowing differentiated treatment for various network traffic classes. Looking at the current trends in this area it turns out that the technology of Differentiated services is currently the most widely used mechanism for QoS assurance in data networks. The major part of this doctoral thesis concerns the design of a novel QoS system which offers a solution for one of the main problems of DiffServ technology. This disadvantage lies in the missing cooperation between the end station and edge node of the DiffServ domain. To overcome this limitation the system proposed introduces an improvement which enables the user application to actively participate in the resource reservation process by direct configuration of the DSCP value in the IP header of its own packets. This functionality is based on the identification of DiffServ configuration parameters available in the edge router. To retrieve the information required from network component the well-known SNMP protocol has been chosen, which has direct access to the components’s configuration stored in the MIB database. On the basis of this theoretical proposal several simulation scenarios have been created and analysed. The results show that the system designed presents an efficient solution for the mentioned problem of DiffServ. They also give good assumptions for the successful implementation of this system into a real environment.

Utah Lake is a really large but shallow lake located in the arid environment of the Western United States. Due to a variety of factors it is listed by the Environmental Protection Agency as an "impaired water body" and must be closely monitored. Because of its large extent and shallow depth the water quality is heterogeneous and can change rapidly. This means that traditional water quality monitoring methods, which require large investments in field personnel, equipment, and water sample analysis, cannot produce a model that is truly representative of the entire water body. This thesis examines the feasibility of using remotely sensed imagery to develop a water quality monitoring system for Utah Lake that is accurate, repeatable and cost-effective. Due to the paucity of in situ water quality information, this is primarily a pilot study using Landsat satellite imagery collected within a 5-day window of existing in situ water samples measuring chlorophyll a. The brightness values of the imagery were regressed against the water samples to produce a model to accurately predict chlorophyll a concentrations across the entire lake. The results of the pilot study conclude that Landsat imagery could be a very useful monitoring tool if sufficient in situ data for calibration were available.

No description available.

Existing layered manufacturing systems fabricate parts using a constant build layer thickness. Hence, operators must compromise between rapid production with large surface inaccuracies, and slow production with high precision, by choosing between thick and thin build layers, respectively. Adaptive layered manufacturing methods alleviate this decision by automatically adjusting the build layer thickness to accommodate surface geometry, thereby potentially enabling part fabrication in significantly less time. Unfortunately, conventional adaptive layered manufacturing techniques are often unable to realize this potential when transitioning from the laboratory to an industrial setting. The problem is that they apply the variable build layer thickness uniformly across each horizontal build plane, applying the same build layer thickness to all parts and part features across that plane even though they have different build layer thickness needs. When this happens, the advantage of using adaptive build layer thicknesses is lost. This thesis demonstrates how to minimize fabrication times when implementing adaptive layered manufacturing. Specifically, it presents a new method in which each part or individual part feature is assigned a distinct, independent build layer thickness according to its particular surface geometry. Additionally, this thesis presents a calibration procedure for the Fused Deposition Modeler (FDM) rapid prototyping system that enables accurate, adaptively sliced parts to be physically realizable. Experimental software has been developed and sample parts have been fabricated to demonstrate both aspects of this work. / Master of Science

Comparison of Dyna-CLUE and Land Change Modeler software for predictive modelling in the suburban area of Prague Abstract The objective of this work was to predict the development of the suburban area of Prague, using Dyna- CLUE and Land Change Modeler (LCM) software, and based on the results compare the capabilities of both these software tools. In this work I used time series of land cover data obtained by the department of applied geoinformatics and cartography, local plans of the municipalities, and information about soil protection provided by the Research Institute for Soil and Water Conservation. Based on these data, a predicted land cover map for 2020 was created in both software tools. The results were then compared and showed that the models respect the restriction of development in predetermined areas. In accordance with local plans, new residential development was properly allocated. For commercial development, the requirements were not completely fulfilled. It is evident that both models are able to create a correct map of future land cover based on specified requirements. However, the instability of LCM and the necessity of using other software while working with Dyna- CLUE somewhat complicated the work. Keywords: Dyna-CLUE, Land Change Modeler, predictive modelling, land cover, residential...

Submitted by Rodrigo Cezar Criado null (ro_geounesp@yahoo.com.br) on 2017-01-25T13:16:49Z No. of bitstreams: 1 Tese_Criado.pdf: 58030264 bytes, checksum: 36253a098d114bc462f4af6972e52ecb (MD5) / Rejected by LUIZA DE MENEZES ROMANETTO (luizamenezes@reitoria.unesp.br), reason: Solicitamos que realize uma nova submissão seguindo a orientação abaixo: O arquivo submetido não contém o certificado de aprovação. Corrija esta informação e realize uma nova submissão com o arquivo correto. Agradecemos a compreensão. on 2017-01-27T12:03:10Z (GMT) / Submitted by Rodrigo Cezar Criado null (ro_geounesp@yahoo.com.br) on 2017-01-27T15:55:37Z No. of bitstreams: 1 Tese_Criado.pdf: 56517603 bytes, checksum: 386275e44323c638fc3864c82058f21a (MD5) / Approved for entry into archive by LUIZA DE MENEZES ROMANETTO (luizamenezes@reitoria.unesp.br) on 2017-01-30T15:31:46Z (GMT) No. of bitstreams: 1 criado_rc_dr_prud.pdf: 56517603 bytes, checksum: 386275e44323c638fc3864c82058f21a (MD5) / Made available in DSpace on 2017-01-30T15:31:46Z (GMT). No. of bitstreams: 1 criado_rc_dr_prud.pdf: 56517603 bytes, checksum: 386275e44323c638fc3864c82058f21a (MD5) Previous issue date: 2016-09-19 / Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) / As transformações ocorridas em uma sociedade, tanto econômicas quanto sociais, refletem na forma como ela se estrutura, em especial, na forma como ela se relaciona com a natureza. Em diferentes épocas do desenvolvimento social a dinâmica econômica impõe, sobre a natureza, diferentes tipos de uso e cobertura da terra. Essa dinâmica que ocorre no mundo todo pode ser melhor descrita com base em estudos localizados, como ocorreu com o oeste do estado de São Paulo, região que passou por grandes transformações em curto período de tempo, dentre elas destaca-se a frente pioneira, a qual transformou a vegetação nativa em pastagens e lavoura. O latifúndio pecuarista tinha como objetivo a criação de gado de corte e a especulação fundiária, fato que desencadeou as ações dos movimentos sociais de luta pela reforma agrária. O desenvolvimento econômico impõe ao meio ambiente as necessidades humanas, como a construção de lagos para as hidrelétricas, pontes, estradas, cidades, dentre outras. Dessa forma, o presente trabalho tem como objetivo compreender as transformações ocorridas no uso e cobertura da terra nos municípios de Euclides da Cunha Paulista, Rosana e Teodoro Sampaio, localizados no Pontal do Paranapanema – SP, no período de 1984 a 2014. Os mapeamentos foram realizados em intervalos de 10 anos com base nas imagens do satélite LANDSAT e com a utilização de aplicativos SIG. Após a realização do mapeamento os dados foram processados e gerados mapas de ganho/manutenção/perda de área para os tipos de uso e cobertura da terra existentes na área objeto de estudo, foi possível perceber a diminuição da vegetação nativa, grandes áreas destinadas a pecuária sendo substituídas por assentamentos, o aumento do espelho d’água com o enchimento de dois grandes reservatórios e a expansão da monocultura da cana-de-açúcar. / The changes a society goes through, either economic or social ones, always reflect the way it is structured, specially, when it comes to its relation to the environment. In different moments of the social development, the economy dynamic has imposed different ways of use and land cover. That dynamic is better describe when there are local studies, as the one carried out in the west of São Paulo State, a region which has undergone huge transformations in a short period of time, such as the one performed by a groups of pioneers who turned native vegetation into pasture and crops. The deforestation followed by fire was a common practice stimulated by the government at that time. The next economic dynamic was ruled by cattleman in large areas of land, the aim was cattle raising and agrarian speculation. This last fact unleashed several social movements fighting for land reform. Social development imposes human needs to the environment, such as building lakes for dams, bridges, roads, cities, among others. Therefore, this research intends to analyse and better understand the changes occured in the land use and cover in the cities of Euclides da Cunha Paulista, Rosana e Teodoro Sampaio, located in Pontal do Paranapanema-SP, from 1984 to 2014. That done by mapping the area with interval of 10 years based on the images collected by the satellite LANDSAT, as well as making use of a GIS application: ArcGis. After the mapping stage, data was processed by the module Land Change Modeler (LCM) which is part of the GIS application Idrisi. Maps of area gain/maintenance/loss were created for each type of land use and cover existing in the area which is object of this study, those make clear the reduction in the native vegetation; large areas dedicated to catlle raising being replaced by settlements; an enlargement of the water mirror due to the filling of two big water reservoirs and the expansion of sugar-cane monoculture.

L’objet de cette thèse est de présenter quelques éléments caractéristiques d’une étude conduite en Tunisie afin d’améliorer la compréhension du processus d’acquisition de compétences dans la conception et la représentation des solutions technologiques en génie mécanique. L’enseignement de la conception mécanique s’appuie largement sur la manipulation d’objets en trois dimensions. Pour autant, les objets ou mécanismes ainsi représentés restent limités à de simples outils de présentation ; leur utilisation, dans le cadre de nouvelles approches de situations d’apprentissage fondées sur la résolution de problèmes, est plutôt limitée. Ces possibilités permettraient de développer des stratégies d’apprentissage plus ouvertes, encourageant la recherche et permettant à l’élève de s’auto-évaluer tout en réduisant le guidage procédural de l’enseignant et son rôle d’évaluateur normatif. Le modeleur 3D pourrait ainsi jouer un rôle particulier avec un changement de statut passant de celui d’outil organisant l’activité pédagogique de l’enseignant à celui d’instrument utilisé par l’élève pour résoudre le problème qui lui est posé. De fait, l’enseignant limitait son investigation et donc sa créativité. La créativité et le nombre de solutions à un problème posé en génie mécanique reposent sur l’exploitation du modeleur 3D qui fait passer l’objet d’un simple outil à un instrument et qui donne à l’élève une autonomie pendant son apprentissage et pendant l’évaluation de sa production. Les résultats obtenus lors de l’étude semblent encourageants tant pour la recherche que pour l’évolution de la discipline. / The purpose of this thesis is to present some characteristic elements of a study conducted in Tunisia. The study was conducted to better understand the acquisition process of competencies in the design and representations of technological solutions in mechanical engineering. The teaching of mechanical engineering to fourth graders, technical branches in Tunisia, takes place in technological laboratories with about 10 computer workstations. The 3D modelling software could thus play a special role with a change of status from that of a tool used by the teacher to organize his teaching activities to an instrument used by the learner to solve a situation problem. The use of 3D modelling software to represent 3D objects gives learners the ability to conceive a range of new solutions. The learner can assess himself without resorting to his teacher, who seems to be so far, the only person who is able to evaluate his work and lead him to the expected solution. In fact, the teacher hinders his investigation and creativity. Creativity and the number of solutions to a problem in mechanical engineering depend heavily on the exploitation of a 3D modelling software that changes the use of a simple tool into an instrument that makes the learner autonomous and able to evaluate his own production. The results obtained in the study are encouraging not only for research but also for the development of mechanical engineering. It will be necessary, however, to check the degree of commitment of the teachers who are in favour of this new teaching-learning tool. It will also be wise to analyse the competencies required by the companies in the field and by the labour market in general.

The aim of this work is to propose feasible solution for the simulation of the SNMP (Simple Network Management Protocol) protocol in the OPNET Modeler simulation environment. This work describes in detail individual procedures, which were chosen for this simulation . The work also contains an introduction to the OPNET Modeler simulation environment, the SNMP protocol, the DiffServ model and the DiffServ-MIB database. The main part of this work describes the algorithms programmed to model the functions of the SNMP protocol. Source codes of the algorithms programmed are included as well. The work deals especially with the functions for obtaining values from different levels of a multilevel model attributes, packet creation functions with dynamically changing length of user-data field, for the implementation process of a simplified DiffServ MIB database and with the functions for statistic creation.