• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 83
  • 40
  • 18
  • 9
  • 7
  • 4
  • 3
  • 2
  • 2
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • Tagged with
  • 186
  • 186
  • 29
  • 28
  • 15
  • 14
  • 14
  • 12
  • 12
  • 12
  • 12
  • 11
  • 11
  • 11
  • 11
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
21

Zaměření budovy hospice v Rajhradě / Surveying of hospice building in Rajhrad

Papež, Jakub January 2014 (has links)
In this Diploma thesis, a 3D model and building plans of hospice building in Rajhrad was created. These products can be used by building management for planning reconstructions and annexes. In the introductory part of this work, informations about hospice building are presented. The second part is devoted to describing data collection for the model. The last largest part describes the modeling in AutoCAD 2014, creation of building plans and the accuracy testing of the final product.
22

Tvorba 3D modelu hradu Kumburk / Creation of 3D model of castle Kumburk

Andrle, Jan January 2014 (has links)
The subject of this thesis is the creation of documentation castle ruins Kumburk form of digital 3D model by photogrammetrical method using optical correlation. Text section describes the way of control establishing, measuring control points and photographic work. Furthermore, the text is dedicated to creating the 3D model itself, and testing its accuracy. Appendix contains the control documentation, testing the accuracy of the model and the 3D model in various formats.
23

Zaměření skutečného stavu roubené stavby v obci Zděchov, včetně zpracování geodetické a stavební dokumentace

Blažková, Kamila January 2017 (has links)
The thesis deals with the measurement of actual state of timbered building in the village Zděchov. Thesis consists of geodetic surveying of house, laser scanning of building, description of laser scanning procedure and cloud of points processing methods for further utilization in the work. The result of measurement is current state building model and proposal of reconstuction.
24

Využití procedurálního jazyka v procesu modelování bloků městské zástavby / The process of city block modeling using a procedural programming language

Koucká, Lucie January 2015 (has links)
The master thesis deals with a block subdivision into parcels using procedural modeling. The main goal focuses on improving of the existing method called OBB-based Subdivision that uses auxiliary envelopes of rectangle shape for splitting. It is required to adapt the method to Czech conditions as well. The first part focuses on the analysis of scientific publications, which describes the development and current situation of procedural modeling issues. Then the methodology of suggested algorithm is described that tests a change of the envelope to the trapezium shape, respectively to the quadrangle shape. In conclusion, the proposed algorithms are tested on the real data in CityEngine, which offered the possibility of using procedural approach to automatically generate 3D parcels. The whole process is controlled by the limitations of development plans of the selected urban areas. Powered by TCPDF (www.tcpdf.org)
25

Dvoudobý motor pro malý motocykl / 2-stroke Engine for Small Motorcycle

Hlaváč, Štěpán January 2008 (has links)
This diploma thesis contains an engineering design of a two-stroke engine for small motorcycle. In the first part, the background research of these motors was made. Main dimensions of the engine and a calculation of the forces acting in crank mechanism were determined. Further check stress analysis of connection rod and calculation using a finite element method were performed. This diploma thesis also includes virtual 3D models of all designed parts and a drawing of cross section of the motor.
26

3D model vybraného objektu / 3D model of the selected object

Raclavský, David January 2020 (has links)
The result of the diploma thesis is a photogrammetrically evaluated georeferenced 3D model of an object with its environment, located in the AdMaS complex. The work describes in detail all phases of creating a 3D model of the object from the selection and calibration of the camera to editing the 3D model. Discuss about software and methods for evaluating 3D models. The thesis deals with the optimal setting of ContectCapture software. The accuracy of the resulting 3D model is tested by the methodology according to ČSN 013410 on the basis of control measurements.
27

Vizualizace výrobních podkladů ve firmě IFE Brno / Visualization of production documents in IFE Brno

Hudec, Jiří January 2011 (has links)
This thesis deals with the effectivity of the work procedure visualisations. This thesis describes basic programs used for work procedure visualisation in the IFE company. The example of a product and following time sequences shows how time -efficient the use of visualized procedures is. The final focus of the thesis is on improving work procedures by using 3D models for simpler assembly procedures and preassembly procedures.
28

Distributed and Higher-Order Graphical Models : towards Segmentation, Tracking, Matching and 3D Model Inference

Wang, Chaohui 29 September 2011 (has links) (PDF)
This thesis is devoted to the development of graph-based methods that address several of the most fundamental computer vision problems, such as segmentation, tracking, shape matching and 3D model inference. The first contribution of this thesis is a unified, single-shot optimization framework for simultaneous segmentation, depth ordering and multi-object tracking from monocular video sequences using a pairwise Markov Random Field (MRF). This is achieved through a novel 2.5D layered model where object-level and pixel-level representations are seamlessly combined through local constraints. Towards introducing high-level knowledge, such as shape priors, we then studied the problem of non-rigid 3D surface matching. The second contribution of this thesis consists of a higher-order graph matching formulation that encodes various measurements of geometric/appearance similarities and intrinsic deformation errors. As the third contribution of this thesis, higher-order interactions were further considered to build pose-invariant statistical shape priors and were exploited for the development of a novel approach for knowledge-based 3D segmentation in medical imaging which is invariant to the global pose and the initialization of the shape model. The last contribution of this thesis aimed to partially address the influence of camera pose in visual perception. To this end, we introduced a unified paradigm for 3D landmark model inference from monocular 2D images to simultaneously determine both the optimal 3D model and the corresponding 2D projections without explicit estimation of the camera viewpoint, which is also able to deal with misdetections/occlusions
29

Spatially resolved measurement of thin film silicon solar modules by laser beam induced current (LBIC) system

Vorasayan, Pongpan January 2010 (has links)
This thesis presents the development of innovative tools to investigate spatially distributed properties of thin film photovoltaic devices. They are required to gain a better understanding of device behaviour driven by how such properties affect the performance of commercial-scale devices. The tools developed for this are a distributed 3D model (D3DM) as simulation software and a laser beam induced current (LBIC) system as a platform for characterisation. The D3DM was developed utilising standard circuit analysis software. It is constructed to simulate realistic device structures and current flows in thin film PV devices. Diode parameters are truly distributed and can be varied independently. The model includes a voltage dependent photocurrent which is a key characteristic of amorphous silicon based solar cells. The D3DM has been used for the investigation of spatial variation in performance due to the distributed nature and non-uniformity of diode parameters and solar cell properties. It is shown that distributed series resistance contributed from the contact layers has a significant impact on solar cell performance and efficiency. The LBIC system is an optical scanning based characterisation tool. Unlike most existing systems, this has been developed specifically for large area, module-size thin film applications. The system provides a detailed photocurrent map which reveals spatial non-uniformity and allows investigation of localised performance variation of the investigated PV devices. System development, components and their characterisation as well as different measurement techniques are described. The model is also applied to LBIC measurements where it is used for a sensitivity analysis of measurement signal with respect to certain cell parameters in cells and modules under different measurement conditions. A new limiting illuminated LBIC (li-LBIC) measurement technique was developed. It is a measurement where the laser-probed cell is brought into limiting condition by means of shading. The signal thus generated is a linear response which was previously unobtainable by typical LBIC measurements. It is unaffected by non-uniform illumination allowing the real properties of investigated cells in a monolithic series connected module to be measured non-destructively.
30

Carotid plaque vulnerability assessment by microscopic morphology analysis, ultrasound and 3D model reconstruction

Choudhury, Ahsan Raza January 2012 (has links)
Research suggests that plaque morphology plays a crucial role in determining plaque vulnerability. However the relationship between plaque morphology and rupture is still not clearly understood due to the limited information of plaque morphology. The aim of this study is to improve our understanding of the relationship between plaque morphology and rupture, and to use this to predict the risk of plaque rupture from the morphology at the molecular level. This can enable the identification of culprit lesions in clinical situations for assessing plaque rupture risk. Histological assessments were carried out on 18 carotid plaque specimens. The 3-D collagen, lipid and macrophage distributions along the entire length of the plaque were analysed in both ruptured and non-ruptured symptomatic plaques. In addition, plaque morphology on the rupture sites were examined and compared with the surrounding regions. It was found that ruptured plaques had thinner fibrous caps and larger lipid cores compared to non-ruptured plaques. Also, ruptured plaques had lower collagen content compared to non-ruptured plaques, and higher collagen contents upstream compared to downstream region from the plaque throat. At the rupture site there was lower collagen content, and a larger lipid core thickness behind a thin fibrous cap compared with the mean for the longitudinally adjacent and circumferential regions. Macrophage cells were located nearer to the boundary of the luminal wall in ruptured plaques. For both groups, the area occupied by macrophages is greater at the upstream shoulder of the plaque. There is a positive correlation between macrophage area and lipid core area, a negative correlation between macrophage area and collagen content, and between lipid core size and collagen content for both plaque groups. 3D reconstruction of ex-vivo specimens of carotid plaques were carried out by a combined analysis of US imaging and histology. To reconstruct accurate 3D plaque morphology, the non-linear tissue distortion in histological images caused by specimen preparation was corrected by a finite element (FE) based deformable registration procedure. This study shows that it is possible to generate a 3D patient specific plaque model using this method. In addition, the study also quantitatively assesses the tissue distortion caused by histological procedures. It shows that at least 30% tissue shrinkage is expected for plaque tissues. The histology analysis result was also used to evaluate ultrasound (US) tissue characterization accuracy. An ex-vivo 2D ultrasound scan set-up was used to obtain serial transverse images through an atherosclerotic plaque. The different plaque component region obtained from ultrasound images was compared with the associated histology result and photograph of the sections. Plaque tissue characterisation using ex-vivo US can be performed qualitatively, whereas lipid core assessment from ultrasound scan can be semi-quantitative. This finding combined with the negative correlation between lipid core size and collagen content, suggests the ability of US to indirectly quantify plaque collagen content. This study may serve as a platform for future studies on improving ultrasound tissue characterization, and may also potentially be used in risk assessment of plaque rupture.

Page generated in 0.0444 seconds