Neuroanatomical Segmentation in MRI: Technological Objectives

1997 ◽  
Vol 11 (08) ◽  
pp. 1161-1187 ◽  
Author(s):  
Andrew J. Worth ◽  
Nikos Makris ◽  
Verne S. Caviness Jr. ◽  
David N. Kennedy
Keyword(s):  
Image Data ◽  
Insufficient Information ◽  
Mr Image ◽  
Brain Images ◽  
Morphometric Analyses ◽  
Definition Of ◽  
Automated Methods ◽  
Signal Intensities

This paper offers a definition of precise, comprehensive, robust and practical neuroanatomical segmentation in magnetic resonance brain images with the goal of performing quantitative morphometric analyses. The main types of difficulties experienced with such problems are described, including those relating to the classification of MR signal intensities and the fact that there is insufficient information in the 2D image. To illustrate the details of obtaining a morphometric description, a case study of semi-automated methods is presented for segmenting the lateral ventricles and caudate nucleus in T1 coronal MR image data. The most significant remaining difficulties are summarized and are offered as objectives for further research.

Process Organization as a Determinant on Team Development and Maturity

2000 ◽  
Vol 44 (12) ◽  
pp. 2-575-2-578
Author(s):  
Georg Stawowy ◽  
Holger Luczak
Keyword(s):  
Work Organization ◽  
Team Work ◽  
Psychological Development ◽  
Team Development ◽  
Social Psychological ◽  
Definition Of ◽  
A Company ◽  
Strategic Goal

Numerous German companies experience a slow down in team work two to three years after the implementation. Therefore, stability of work organization gains importance as a strategic goal. Based on a literature review on team development a model to describe team development as a basis for the definition of team maturity is presented in this paper. Furthermore, a classification of team tasks in addition to a chosen model of team development lead to a model to explain the relationships among process organization, team tasks and the level of social-psychological development. The underlying hypothesis are finally formulated. Following, a company case study with 28 teams has been conducted to research the tasks within a flow production line and to assess in 48 interviews with members of 14 teams the achieved level of team maturity.

scholarly journals Development Of Landsat Cloud Free Image Data For Classification Of Land Cover-Case Study In Dak Lak Province

2019 ◽  
Vol 35 (4) ◽  
Author(s):  
Tran Anh Tuan ◽  
Nguyen Dinh Duong
Keyword(s):  
Land Cover ◽  
Optical Sensors ◽  
Image Data ◽  
Landsat 8 ◽  
Optical Remote Sensing ◽  
Earth Surface ◽  
Dry Seasons

Land cover mapping by optical remote sensing has many obstacles including clouds. Clouds block solar radiation coming to earth surface and reflective radiance from the earth surface to remote optical sensors resulting. Therefore, clouds result no-signal areas in images that cannot be used for study of ground objects. In many cases, thin clouds degrade quality of reflective radiance and some times alter, unexpectedly, spectral reflectance characteristics of ground objects leading to false classification. In this paper, the authors present an algorithm on application of multidate for development of cloud free image. The used image data were received in rainy and dry seasons and by stacking, cloud free images representing rainy and dry seasons were created. These cloud free images can be used further for classification of land cover in rainy and dry seasons. Experiments were conducted with Landsat 8 OLI images with path/row number 124/51 covering Dak Lak province of Vietnam. The results of case study were development of cloud free image data representing rainy and dry seasons allowing separation of evegreen and deciduous forests in the study site.  

scholarly journals Ventricle Segmentation with Itk's Watershed filter

2007 ◽  
Author(s):  
Matthew Stickney
Keyword(s):  
Healthy Volunteers ◽  
Image Data ◽  
Mr Image ◽  
Brain Images ◽  
Mr Brain Images ◽  
Mr Brain ◽  
Ventricle Segmentation

This paper describes the use of the Insight Toolkit (www.itk.org) to segment the ventricles in MR image data obtained from the Designed Database of MR Brain Images of Healthy Volunteers hosted at the MIDAS project.

scholarly journals Identificação e Classificação do relevo do município de São Martinho da Serra – RS

2021 ◽  
Vol 43 ◽  
pp. e49
Author(s):  
Antonio Von Ende Dotto ◽  
Luís Eduardo de Souza Robaina
Keyword(s):  
The Other ◽  
Gray Level ◽  
Rio Grande Do Sul ◽  
Digital Format ◽  
Relief Elements ◽  
Definition Of ◽  
Automated Methods ◽  
Automatic Technique ◽  
Environmental Units

The relief is one of the main definers of the environmental units, so that its compartmentalization is closely related to the distribution of the other attributes of landscape genesis. The objective of this study is to establish a division of the relief of the municipality of São Martinho da Serra, Rio Grande do Sul. Cartographic bases in digital format associated with the Geographic Information System were used, through automated methods and with the integration of morphometric variables. For the definition of the relief forms, the combined analysis of the morphometric attributes amplitude and slope was considered, identifying flat areas, gentle hills of altitude, rolling hills, association of hills with large hills and buttes and isolated buttes. The relief elements were obtained through the automatic technique that consists of the analysis of the gray level of a central cell and its neighbors, determining topographic differences. The identified elements are flat, peak, ridge, shoulder, spur, slope, hollow, footslope, valley and pit. For the classification of the forms of the slopes, the profile and plane of curvature of the slopes were used, defining 4 geomorphometric units defined as Unit I convex-convergent, Unit II concave-convergent, Unit III convex-divergent and Unit IV concave-divergent. In general, the methodology used obtained satisfactory results, allowing a quick and consistent analysis of the relief of the municipality.

Using classification to convict the Khmer Rouge

2012 ◽  
Vol 68 (2) ◽  
pp. 162-184 ◽  
Author(s):  
Michelle Caswell
Keyword(s):  
Human Rights ◽  
Khmer Rouge ◽  
Content Type ◽  
Human Rights Abuses ◽  
Strategic Essentialism ◽  
Definition Of ◽  
Key Participants ◽  
Legal Consequences

PurposeThe purpose of this paper is to explore the importance of classification structures to efforts at holding perpetrators of human rights abuses accountable using one archival repository in Cambodia as a case study.Design/methodology/approachThe primary methodology of this paper is a textual analysis of the Documentation Center of Cambodia's classification scheme, as well as a conceptual analysis using the theoretical framework originally posited by Bowker and Star and further developed by Harris and Duff. These analyses were supplemented by interviews with key participants.FindingsThe Documentation Center of Cambodia's classification of Khmer Rouge records by ethnic identity has had a major impact on charging former officials of the regime with genocide in the ongoing human rights tribunal.Social implicationsAs this exploration of the DC‐Cam database shows, archival description can be used as a tool to promote accountability in societies coming to terms with difficult histories.Originality/valueThis paper expands and revises Harris and Duff's definition of liberatory description to include Spivak's concept of strategic essentialism, arguing that archivists’ classification choices have important ethical and legal consequences.

scholarly journals Adinkra (in)equivalence from Coxeter group representations: A case study

2014 ◽  
Vol 29 (06) ◽  
pp. 1450029 ◽  
Author(s):  
Isaac Chappell ◽  
S. James Gates ◽  
T. Hübsch
Keyword(s):  
Dimensional Space ◽  
Solution Space ◽  
Group Representations ◽  
Dimensional Solution ◽  
Signed Permutation ◽  
Higher Dimensional ◽  
Dimensional Space Time ◽  
Definition Of

Using a Mathematica TM code, we present a straightforward numerical analysis of the 384-dimensional solution space of signed permutation 4×4 matrices, which in sets of four, provide representations of the 𝒢ℛ(4, 4) algebra, closely related to the 𝒩 = 1 (simple) supersymmetry algebra in four-dimensional space–time. Following after ideas discussed in previous papers about automorphisms and classification of adinkras and corresponding supermultiplets, we make a new and alternative proposal to use equivalence classes of the (unsigned) permutation group S4 to define distinct representations of higher-dimensional spin bundles within the context of adinkras. For this purpose, the definition of a dual operator akin to the well-known Hodge star is found to partition the space of these 𝒢ℛ(4, 4) representations into three suggestive classes.

scholarly journals Asset Management of the Public Sector in Poland

2013 ◽  
Vol 21 (1) ◽  
pp. 5-13 ◽  
Author(s):  
Małgorzata Rymarzak ◽  
Dariusz Trojanowski
Keyword(s):  
Public Sector ◽  
Asset Management ◽  
Theory And Practice ◽  
Real Property ◽  
The Public ◽  
Fixed Assets ◽  
Definition Of ◽  
Capital Intensive

Abstract Public sector bodies own diverse, valuable but capital-intensive assets, which require the following of all the changes taking place in their environment and their trends (conducting market analyses), as well as the anticipation of future effects of present-day actions (decisions). It seems, however, that many public bodies/entities make decisions according to current needs, hardly ever conducting market analyses or market valuation of their assets. Today, both theory and practice offer a variety of methods - instruments supporting the process of decision-making concerning the creation of a rational structure of real property, sources of its financing, evaluation of the effectiveness of using individual fixed assets and their impact on the economic situation of each body/entity. The purpose of this paper is to present the nature and scale of the problem of asset management, as well as the main elements of the process of the management of real property owned by public entities, based on a case study of the biggest Polish cities. At first, we will outline the scale of the problem, including the gross value of buildings and structures and capital expenditures of the public sector. Then, we will present the definition of asset management and classification of real property as tools and conditions for effective asset management, as well as the results of empirical research conducted with officials responsible for property management in Poland's six largest cities.

scholarly journals The Ironbridge Gorge Heritage Site and its local and regional functions

2017 ◽  
Vol 36 (36) ◽  
pp. 61-75
Author(s):  
Waldemar Cudny
Keyword(s):  
Heritage Tourism ◽  
Heritage Management ◽  
Cultural Impact ◽  
Construction Companies ◽  
The United Kingdom ◽  
Heritage Site ◽  
Definition Of ◽  
School Youth

Abstract The article is devoted to the issue of heritage and its functions. Based on the existing literature, the author presents the definition of heritage, the classification of heritage resources, and its most important impacts. The aim of the article was to show the functions that may be performed by a heritage site, locally and regionally. The example used by the author is the Ironbridge Gorge Heritage Site in the United Kingdom. Most heritage functions described by other authors are confirmed in this case study. The cultural heritage of the Ironbridge Gorge creates an opportunity to undertake various local and regional activities, having first of all an educational influence on the inhabitants, school youth and tourists. We must not ignore the economicinfluences, such as financing the activity of the Ironbridge Trust (the institution administering the site), generating income for local firms providing service to tourists, or for construction companies. This income helps to preserve and conserve the tangible heritage of the Ironbridge Gorge, as well as to generate jobs in heritage management, conservation and heritage tourism. Other effects of the Ironbridge Gorge Site include a socio-cultural impact or that related to sustainable development.

scholarly journals Escher's Ants as Metaphor: Topological Marching for the Well-Composed, Genus Zero Crowd

2010 ◽  
Author(s):  
Nicholas J. Tustison ◽  
Brian Avants ◽  
Marcelo Siqueira ◽  
James Gee
Keyword(s):  
Level Set ◽  
Image Data ◽  
Theoretical Discussion ◽  
Brain Segmentation ◽  
Genus Zero ◽  
Brain Images ◽  
Original Topology ◽  
Constrained Evolution ◽  
Initial Seed ◽  
Definition Of

Topological considerations for segmentation results are important for such applications as proper brain segmentation from digital image data. We present an enhancement of the FastMarchingImageFilter which allows for topologically constrained evolution of the level set. Identical to the original functionality of the FastMarchingImageFilter, the evolution of the level set of a single or multiple genus zero, well-composed seed objects proceeds according to the specified parameters. With our proposed enhancements, the user can either choose to prevent the level set from merging with itself such that the original topology of the initial seed object(s) is not violated or that no handles are created during the evolution process. However, in contrast to earlier approaches which relied on the concept of the simple point implicitly requiring the definition of a user-specified foreground/background connectivity, we use the related, but more restrictive concept of well-composed sets to topologically constrain the evolution of the level set. Utility of our submission is demonstrated on both 2-D and 3-D brain images. Note that this submission is a companion piece to a more theoretical discussion of our work given in [9]

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