New Algorithm for Modeling of Bronchial Trees

2012 ◽  
Vol 17 (4) ◽  
pp. 179-190
Author(s):  
Kacper Pluta ◽  
Marcin Janaszewski ◽  
Michał Postolski
Keyword(s):  
Quantitative Analysis ◽  
3D Model ◽  
Ct Images ◽  
Basic Algorithm ◽  
New Model ◽  
Comparison Of Results ◽  
Basic Model ◽  
New Models ◽  
Bronchial Tubes

Abstract The article presents new conception of 3D model of human bronchial tubes, which represents bronchial tubes extracted from CT images of the chest. The new algorithm which generates new model is an extension of the algorithm (basic algorithm) proposed by Hiroko Kitaoka, Ryuji Takaki and Bela Suki. The basic model has been extended by geometric deformations of branches and noise which occur in bronchial trees extracted from CT images. The article presents comparison of results obtained with the use of the new algorithm and the basic one. Moreover, the discussion of usefulness of generated new models for testing of algorithms for quantitative analysis of bronchial tubes based on CT images is also included.

scholarly journals Enhancement of Exit Flow Uniformity by Modifying the Shape of a Gas Torch to Obtain a Uniform Temperature Distribution on a Steel Plate during Preheating

2018 ◽  
Vol 8 (11) ◽  
pp. 2197
Author(s):  
Thien Ngo ◽  
Junho Go ◽  
Tianjun Zhou ◽  
Hap Nguyen ◽  
Geun Lee
Keyword(s):  
Temperature Distribution ◽  
Temperature Difference ◽  
Steel Plate ◽  
Flow Distribution ◽  
Uniform Temperature ◽  
Flow Uniformity ◽  
Modified Model ◽  
Uniform Temperature Distribution ◽  
Basic Model ◽  
New Models

The objective of this study is to improve the exit flow uniformity of a gas torch with multiple exit holes for effective heating of a steel plate. The torch was simulated, and combustion experiments were performed for validation. Based on a basic model, three different revised models were designed and analyzed with the software ANSYS FLUENT 18.2. The flow uniformity (γ) of the velocity distribution at the multiple exit holes was investigated with the pressure drop ranging from 100 to 500 Pa. The basic model had flow uniformity ranging from 0.849 to 0.852, but the three new models had γ1 = 0.901–0.912, γ2 = 0.902–0.911, and γ3 = 0.901–0.914, respectively. The maximum percentage difference of the flow uniformity index between the three new models and the basic model was 7.3%. The basic model with nonuniform flow distribution made a temperature difference of the back side of the steel plate from the center to the edge of around 229 °C, while the modified model with uniform flow distribution had a smaller temperature difference of 90 °C. The simulation results showed good agreement with our experimental results for both the basic model and the modified model. The modified gas torch made a wider and more uniform temperature distribution on a preheated steel plate than the basic one. The results revealed that a trade-off between cost and flow uniformity, as well as the new gas torch, could be applied to a steel-plate preheating process before welding.

A new model-based framework for lung tissue segmentation in three-dimensional thoracic CT images

2017 ◽  
Vol 12 (2) ◽  
pp. 339-346 ◽  
Author(s):  
Zeinab Naseri Samaghcheh ◽  
Fatemeh Abdoli ◽  
Hamid Abrishami Moghaddam ◽  
Mohammadreza Modaresi ◽  
Neda Pak
Keyword(s):  
Lung Tissue ◽  
Three Dimensional ◽  
Ct Images ◽  
Tissue Segmentation ◽  
New Model ◽  
Model Based ◽  
Thoracic Ct

scholarly journals MODEL BASED VIEWPOINT PLANNING FOR TERRESTRIAL LASER SCANNING FROM AN ECONOMIC PERSPECTIVE

2016 ◽  
Vol XLI-B5 ◽  
pp. 607-614
Author(s):  
D. Wujanz ◽  
F. Neitzel
Keyword(s):  
Laser Scanning ◽  
3D Model ◽  
Acquisition Time ◽  
Small Subset ◽  
Economic Perspective ◽  
Object Surface ◽  
Basic Algorithm ◽  
Laser Scanners ◽  
Planning Algorithm ◽  
Viewpoint Planning

Despite the enormous popularity of terrestrial laser scanners in the field of Geodesy, economic aspects in the context of data acquisition are mostly considered intuitively. In contrast to established acquisition techniques, such as tacheometry and photogrammetry, optimisation of the acquisition configuration cannot be conducted based on assumed object coordinates, as these would change in dependence to the chosen viewpoint. Instead, a combinatorial viewpoint planning algorithm is proposed that uses a given 3D-model as an input and simulates laser scans based on predefined viewpoints. The method determines a suitably small subset of viewpoints from which the sampled object surface is preferably large. An extension of the basic algorithm is proposed that only considers subsets of viewpoints that can be registered to a common dataset. After exemplification of the method, the expected acquisition time in the field is estimated based on computed viewpoint plans.

New Model

2011 ◽  
Author(s):  
Michel Balinski ◽  
Rida Laraki
Keyword(s):  
Social Choice ◽  
Decision Maker ◽  
Choice Theory ◽  
Social Choice Theory ◽  
Common Language ◽  
Final Grade ◽  
New Model ◽  
Basic Model ◽  
Single Score

This chapter presents a new basic model, which consists of a common language of evaluation, a set of judges, and a set of competitors. It expresses the problem of what to do with judges’ scores and how to resolve them into a single score in a concise or systematic way. The model identifies the shortcomings of traditional models of social choice theory and provides a new model as an alternative. Six axioms of the basic model are satisfied in a method of grading called social grading function f, in which there is no ambiguity in grading, and the final grade assigned to every single alternative is independent of all other alternatives. The deep preferences or utilities of a judge or a voter play an important role in voting and judging as every decision-maker tries to maximize his utility.

How Social Media Offers Opportunities for Growth in the Traditional Media Industry

2019 ◽  
pp. 727-742
Author(s):  
Andrew Duffy
Keyword(s):  
Social Media ◽  
Web 2.0 ◽  
Media Industry ◽  
Traditional Media ◽  
New Model ◽  
New Models

Under threat from social media and interactive Web 2.0, the traditional media industry seeks new models to maintain its viability. This chapter studies both consumers and prospective producers of one genre—travel journalism—to advocate a model that could help arrest the industry's decline and return to growth. It argues that one way forward for traditional media would be a new model of curatorship, in which a professional journalist collaborates with amateur contributors. It suggests that such a hybrid arrangement will be recognisable neither as professional newsroom nor as amateur social media, but a new model with features of both. This offers a way forward so that rather than contributing to the declining fortunes of the traditional media industry, as many journalists fear, social media can instead encourage progress.

Quantitative analysis of brain herniation from non-contrast CT images using deep learning

2021 ◽  
Vol 349 ◽  
pp. 109033
Author(s):  
Manas Kumar Nag ◽  
Akshat Gupta ◽  
A.S. Hariharasudhan ◽  
Anup Kumar Sadhu ◽  
Abir Das ◽  
...  
Keyword(s):  
Deep Learning ◽  
Quantitative Analysis ◽  
Ct Images ◽  
Brain Herniation ◽  
Contrast Ct
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