Theoretical Analysis Theory

Words: 1482
Pages: 6
Open Document
4.4. Introduction to graph theoretical analysis. The case of brain perfusion SPECT.
In the field of quantitative neuroimaging, graph theoretical analysis is one of the methods to study brain connectivity [93-95, 100, 101]. A key concept of this method is the notion of topology. This concept can be illustrated with a simple idea which is used when we travel in the subway of any large city. In figure 3 two maps of the London subway appear, the first map shows a precise spatial description of the railways (or lines) through which trains travel (i.e., the subway topography), whereas the second one is only concerned with the relative locations of subway stations and connecting lines (i.e., the subway topology). These two maps do not coincide with …show more content…
By simply inspecting the topological maps, it is not easy to know if one subway is better organized than the other (e.g., subway efficiency). One way to simplify this problem is to use metrics that quantify or analyze the subway network using graph theory [94, 101]. Hence the name of graph theoretical analysis.
A first aspect to measure could be how easy it is to travel between any two stations (e.g. the number of stations on average, between the start and end of the trip). This aspect is relevant, especially if the traveler wants to visit different parts of the city on the same day. This example illustrates the concept of global efficiency of a graph [94, 101]. The metric of global efficiency is a way to quantify the global connectivity (integration) of the network. In this example, it is assumed that the number of stations (nodes) and lines (connectors) are the same in the two subways that are …show more content…
they are also topological neighbor), but without direct connections with distant topographical nodes (i.e., a network with a high local but a low global efficiency) (Table 1). At the other extreme would be a random network, where direct connections between any two nodes are random. Thus, in a random network, the local efficiency is low and the global efficiency is high as compared to an ordered network. In the middle of these two extremes would be what is known as a complex network, in which there is a balance between global and local efficiencies so that both are relatively high [94, 101] (Table 1). This kind of networks is said to have a ‘small-world’ topology. The concept of 'small world' comes from the social sciences, and reflects the fact that two persons (nodes) who do not know each other are nevertheless connected by a relatively short chain of persons known to each other. A complex network is also characterized by the presence of hubs and high modularity [94,
Show More

Related Documents: Theoretical Analysis Theory

Theory: Sociology and Major Theoretical Perspective Essay

Myah McIntosh Social Theory March 17, 2013 Theoretical Perspectives The major theoretical perspectives of sociology include symbolic interactionism, structural functionalism, conflict theory, ethnomethodology, dramaturgical analysis, exchange theory, world systems theory, and feminist theory. I am going to describe each topic by explaining the key concepts, the logic of the perspective, the macro and micro perspective, their major contributors, their most influential period, and social phenomena…

Words 1567 - Pages 7

Essay about Nrs-433v Week 3 Research Critique, Part 1

help@mindblows.us NRS-433V Week 3 Research Critique, Part 1 Introduction to Nursing Research – Theory, Design, and Sampling Prepare a critical analysis of a qualitative study focusing on the problem statement, study purpose, research question, literature review, and theoretical framework. This can be one of the selected articles from your previous literature review or a new peer-reviewed article. The completed analysis should be 1,000-1,250 words and should connect to your identified practice problem of…

Words 4239 - Pages 17

Entrepreneurship And Small Business Development

Criteria Student ID: Marking Tutor: 1st (70+) 2:1 (60-69) 2:2 (50-59) 3rd (40-49) Fail (less than 40) Marks (%) A) Introduction (15%) (approximate 300 words) B) Describe the project clearly, e.g., its theoretical conceptual background, its importance/significance and (if any) its limitations. Moreover, a brief introduction of the business entrepreneur selected and an identification and explanation of the context, in which the selected attribute, is going…

Words 1813 - Pages 8

Essay on Harrassed to death

covered in the paper. II. Analysis of the case of Katie through the lens of Stern a. Discuss Katie’s development across the 4 senses of self, using examples to illustrate Stern’s concepts. III. Analysis of the case of Katie through your assigned theory a. Analyze Katie’s development by using the concepts connected with your assigned theory. IV. Analysis of the cultural appropriateness of each theory a. What are the strengths and challenges connected with the two theories explored in this paper…

Words 315 - Pages 2

Grounded Theory In Clinical Practice

This paper will describe how a Grounded theory methodology could be used to answer the research question. In order to demonstrate why Grounded theory would be a suitable methodology to investigate this issue, the author will describe the background to Grounded theory, the different “schools” within the Methodology and key differences of how Grounded theory is used. Grounded theory Grounded theory can be defined as the inductive and systematic generation of theory from data (Glaser and Strauss 1967)…

Words 1591 - Pages 7

The Methodology of Early Accounting Theorists Essay

conclusion reached is that the major theoretical works in accounting were methodologically unsophisticated — particularly in comparison with other disciplines such as economics. Key words: Accounting theory; Scientific method; Theory. INTRODUCTION: UNREFINED AND PRIMITIVE METHODOLOGY An examination of the methodological development of accounting invites the conclusion that the discipline is unimaginative and unintellectual. It seems to have developed no theory of its own, no philosophy. In fact…

Words 6716 - Pages 27

A Process of Decision Making by Caregivers of Family Members with Heart Failure Essay

An Analysis of Standford et al.’s Study 1|P a ge An Analysis of Sanford, Townsend-Rocchicciolli, Horigan, & Hall’s Study A Process of Decision Making by Caregivers of Family Members With Heart Failure A research critique submitted by Thelma Augustin, Melody Alexander, Ashley Breaux, Nissa Fisher, Kamaria Harris, Thao Huynh, Jeris Jensen, Leslie King, and Susan Livengood, Master of Science in Nursing Research College of Nursing 2012 An Analysis of Standford et al.’s Study 2|P a ge…

Words 3361 - Pages 14

Essay on Ir Theory Article Review-Doyle

Doyle, M. ‘Liberalism and World Politics’, American Political Science Review, 1986, vol. 80(4), pp. 1151-69 INTERNATIONAL RELATIONS THEORY Article Review 17th October 2011. Doyle, M. ‘Liberalism and World Politics’, American Political Science Review, 1986, vol. 80(4), pp. 1151-69 Michael Doyle, author of this article was one of the first IR theorists in modern era to analyze…

Words 1083 - Pages 5

Goldkuhl 2003 1 Essay

(LAP-2003), 1-2 July, 2003, Tilburg, The Netherlands Conversational Analysis as a Theoretical Foundation for Language Action Approaches? Göran Goldkuhl VITS Research Network Department of Computer and Information Science, Linköping University and Jönköping International Business School Sweden ggo@ida.liu.se Abstract Communication modelling approaches within the Language Action Perspective (LAP) are based on two important theoretical cornerstones: 1) considering language use as action and 2) organisation…

Words 7936 - Pages 32

Evolution: Ronald Fisher and Theoretical Population Genetics Essay

graduated from Columbia University, he developed the theory of punctuated equilibrium in 1972. It proposed that evolution is marked by long periods of stability, punctuated by rare instances of evolution. Gould made three general arguments for evolution. First, he pointed to the undeniable evidence of evolution within species. Second, Gould argued from the imperfections that appear in so many species. It impacted Darwin’s explanation and theory. In 1982, he was diagnosed with cancer. May 20th 2002…

Words 415 - Pages 2