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PolyMeCo-An integrated environment for polygonal mesh analysis and comparison

Silva, S.; Madeira, J.; Santos, B.S.
Fonte: Elsevier Publicador: Elsevier
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
35.97%
Polygonal meshes are used in several application areas to model different objects and structures. Depending on the application, mesh models sometimes have to be processed to, for instance, reduce their complexity (mesh simplification). Such operations introduce differences regarding the original mesh, whose evaluation is of paramount importance when choosing the processing methods to be applied for a particular purpose. Although some mesh analysis and comparison tools are described in the literature, little attention has been given to the way mesh features and mesh comparison results can be visualized. Moreover, particular functionalities have to be made available to enable systematic use and proper data analysis and exploration. PolyMeCo-a tool for polygonal mesh analysis and comparison-was designed and developed taking the above objectives into account. It enhances the way users analyze features and compare meshes by providing an integrated environment where various mesh quality measures and several visualization options are available and can be used in a coordinated way, thus leading to greater insight into the visualized data.

Enabling Global Price Comparison through Semantic Integration of Web Data

Zhu, Hongwei; Siegel, Michael; Madnick, Stuart
Fonte: MIT - Massachusetts Institute of Technology Publicador: MIT - Massachusetts Institute of Technology
Tipo: Trabalho em Andamento
EN_US
Relevância na Pesquisa
36.01%
“Sell Globally” and “Shop Globally” have been seen as a potential benefit of web-enabled electronic business. One important step toward realizing this benefit is to know how things are selling in various parts of the world. A global price comparison service would address this need. But there have not been many such services. In this paper, we use a case study of global price dispersion to illustrate the need and the value of a global price comparison service. Then we identify and discuss several technology challenges, including semantic heterogeneity, in providing a global price comparison service. We propose a mediation architecture to address the semantic heterogeneity problem, and demonstrate the feasibility of the proposed architecture by implementing a prototype that enables global price comparison using data from web sources in several countries.

O Teorema de Comparação de Volume de Bishop-Gromov.; Bishop-Gromov s theorem of comparison of volume.

Santos, Erikson Alexandre Fonseca dos
Fonte: Universidade Federal de Alagoas; BR; Análise; Geometria Diferencial; Sistemas dinâmicos; Computação gráfica; Programa de Pós-Graduação em Matemática; UFAL Publicador: Universidade Federal de Alagoas; BR; Análise; Geometria Diferencial; Sistemas dinâmicos; Computação gráfica; Programa de Pós-Graduação em Matemática; UFAL
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
35.97%
IN THIS dissertation, we use the Laplacian comparison theorem to prove the comparison of volume Bishop-Gromov s theorem, which assures that if the Ricci curvatures of a complete Riemannian manifold are larger than or equal to (n - 1)k, the volume of a ball with center in p and radius R is smaller than or equal to the volume of a geodesic ball with radius R in the space form of sectional constant curvature k, for all p 2 M and R > 0, where k 2 R. Moreover, equality occurs if all sectional curvature throughout geodesics connecting p and x, for plans which contain the radial vector, is constant and equal to k.; Fundação de Amparo a Pesquisa do Estado de Alagoas; NESTA DISSERTAÇÃO, usamos o teorema de comparação do Laplaciano para demonstrar o teorema de comparação de volume de Bishop-Gromov, o qual assegura que, se as curvaturas de Ricci de uma variedade Riemanniana completa são maiores ou iguais a (n��1)k, k uma constante real, então, para todo p 2 M e para todo R > 0, o volume de uma bola centrada em p e de raio R é menor ou igual que o volume de uma bola geodésica de raio R na forma espacial de curvatura seccional constante k. Ademais, a igualdade ocorre se toda curvatura seccional ao longo de geodésicas ligando p e x...

Public Sector-operated Price-comparison Websites : Case Studies and Good Practices

World Bank
Fonte: Washington, DC Publicador: Washington, DC
EN_US
Relevância na Pesquisa
36.06%
This technical note is intended to provide regulators with concrete, practical information on operating price-comparison websites and the strategic considerations necessary to take into account when designing such sites. The technical note examines price-comparison websites operated by public sector entities in Canada, Hungary, Ireland, Malaysia, Mexico, Norway, and the United Kingdom. The technical note describes the price-comparison tools in these case study countries, comparing differing approaches and highlighting good practices found across countries. Institutional and structural arrangements were found to vary across case study countries. Price-comparison websites are operated by either a financial regulator (Hungary, Malaysia) or more commonly by a financial consumer agency set up by the government but operating as an independent agency (Canada, Ireland, Mexico, Norway, United Kingdom). Typically, less sophisticated price-comparison websites provide basic price-comparison tools, while more sophisticated sites provide interactive product-selection tools and complementary educational materials in an intuitive...

A general comparison theorem for backward stochastic differential equations

Cohen, S.; Elliott, R.; Pearce, C.
Fonte: Applied Probability Trust Publicador: Applied Probability Trust
Tipo: Artigo de Revista Científica
Publicado em //2010 EN
Relevância na Pesquisa
35.97%
A useful result when dealing with backward stochastic differential equations is the comparison theorem of Peng (1992). When the equations are not based on Brownian motion, the comparison theorem no longer holds in general. In this paper we present a condition for a comparison theorem to hold for backward stochastic differential equations based on arbitrary martingales. This theorem applies to both vector and scalar situations. Applications to the theory of nonlinear expectations are also explored.; Samuel N. Cohen, Robert J. Elliott, Charles E. M. Pearce

Forensic confirmation bias: the case of facial image comparison

Heyer, R.; Semmler, C.
Fonte: Elsevier Publicador: Elsevier
Tipo: Artigo de Revista Científica
Publicado em //2013 EN
Relevância na Pesquisa
35.97%
Facial image comparison is the process of comparing a face with another (referred to as one-to-one facial image comparison or facial examination) or many others (one-to-many facial image comparison or facial review). As such it encompasses much of the basic visual cognition present in other forensic disciplines. The discipline has grown considerably since the introduction of facial recognition technology in the last decade (Spaun, 2007). Such technology is currently being used widely in the government and private sectors, including law enforcement (Phillips, 2011). Much like automated fingerprint identification systems (AFIS), the current generation of identification facial recognition systems require a human in the loop (Spaun, 2009). Research conducted over the past decade has consistently found that, although significant, the role of the human is often underestimated by organisations implementing facial recognition technology (O’Toole, Jiang, Roark, & Abdi, 2006; Spaun, 2009). This is not surprising, given that the importance of understanding the human role has often been overshadowed by the promises of the technology. As a consequence, the requirements for human-centered system design and training have often been neglected.; Rebecca Heyer...

Selected Issues in the Theory of Comparison: Phrasal Comparison in Turkish and a Cross-Linguistic Perspective on Intensifiers, Negative Island Effects and the Distribution of Measure Phrases; Ausgewählte Aspekte der Theoriebildung zu Vergleichskonstruktionen: Phrasale Vergleiche im Türkischen und ein sprachübergreifender Blick auf Intensivierer, Negativinseleffekte und die Distribution von Maßphrasen

Hofstetter, Stefan
Fonte: Universidade de Tubinga Publicador: Universidade de Tubinga
Tipo: Dissertação
EN
Relevância na Pesquisa
36.09%
This dissertation primarily aims at filling a number of gaps in the theory of comparison, in particular with respect to phrasal comparison in Turkish, intensifiers, Negative Island Effects and the cross-linguistic distribution of measure phrases. In its first main section, it provides a fairly exhaustive overview of the inventory of comparison constructions attested in the Turkish language and shows that the adverb daha is a largely optional element with these except for constructions that lack an overt standard of comparison. Moreover, a novel semantics for this adverb in terms of an evaluative presupposition is developed and the polysemies daha and its counterparts in many other languages give rise to are investigated in a systematic way. In addition, it is argued that comparison in Turkish is strictly phrasal in nature and that standard approaches to phrasal comparison yield highly unsatisfactory results in several respects, as a consequence of which a new approach to this special type of comparison is suggested that essentially relies on the association of individuals with implicit degrees. It is furthermore demonstrated that this novel approach makes the right kind of predictions for Turkish comparisons including quantificational expressions and that even though this analysis cannot be transferred to English (superficially) phrasal comparison constructions throughout...

Sozialer Vergleich bei der computergestützten Gruppenarbeit; Social Comparison in Computer Supported Cooperative Work

Munkes, Jörg
Fonte: Universidade de Tubinga Publicador: Universidade de Tubinga
Tipo: Dissertação
DE_DE
Relevância na Pesquisa
36.05%
Gruppenarbeit führt oft dazu, dass die Gruppenmitglieder unter ihrer potenziellen Leistung bleiben. Dies widerspricht der weitverbreiteten Meinung, dass sich Gruppenarbeit leistungsförderlich auswirkt. Verantwortlich für diese Leistungsverminderung sind sogenannte Prozessverluste. Die Vernetzung von Computern ermöglicht es, viele der in face-to-face Gruppen auftretenden Prozessverluste zu verringern. Gruppenarbeit kann dann zu einer Leistungsverbesserung führen, wenn es gelingt, die Motivation in Gruppen zu steigern. Einen solchen Prozessgewinn stellt Wettbewerb durch sozialen Vergleich dar. Menschen haben ein Bedürfnis ihre eigenen Fähigkeiten und Einstellungen korrekt einzuschätzen. Sie vergleichen sich daher mit anderen Personen und versuchen, wenn Fähigkeiten verglichen werden, besser zu sein als andere Personen. Es sollte sich daher ein leistungsförderlicher Wettbewerb zwischen den Personen zeigen. Motivationsgewinne innerhalb einer Gruppe sollten auftreten, wenn sozialer Vergleich zwischen den Gruppenmitgliedern stattfindet, um die individuellen Fähigkeiten einzuschätzen. Untersucht wurde der Zusammenhang zwischen sozialem Vergleich und Leistung in vier experimentellen Studien. In den ersten drei Experimenten wurde die Kreativitätstechnik Brainstorming als Aufgabe verwendet. Es zeigte sich...

ParsEval: Parallel comparison and analysis of gene structure annotations

Standage, D.S.; Brendel, V.P.
Fonte: BioMed Central Ltd. Publicador: BioMed Central Ltd.
Tipo: Artigo de Revista Científica
EN_US
Relevância na Pesquisa
35.97%
Background: Accurate gene structure annotation is a fundamental but somewhat elusive goal of genome projects, as witnessed by the fact that (model) genomes typically undergo several cycles of re-annotation. In many cases, it is not only different versions of annotations that need to be compared but also different sources of annotation of the same genome, derived from distinct gene prediction workflows. Such comparisons are of interest to annotation providers, prediction software developers, and end-users, who all need to assess what is common and what is different among distinct annotation sources. We developed ParsEval, a software application for pairwise comparison of sets of gene structure annotations. ParsEval calculates several statistics that highlight the similarities and differences between the two sets of annotations provided. These statistics are presented in an aggregate summary report, with additional details provided as individual reports specific to non-overlapping, gene-model-centric genomic loci. Genome browser styled graphics embedded in these reports help visualize the genomic context of the annotations. Output from ParsEval is both easily read and parsed, enabling systematic identification of problematic gene models for subsequent focused analysis. Results: ParsEval is capable of analyzing annotations for large eukaryotic genomes on typical desktop or laptop hardware. In comparison to existing methods...

The Role of Social Comparison in Emotional Responses and Exposure to Reality and Scripted Television Programs

Lewis, Nicole Helen
Fonte: [Bloomington, Ind.] : Indiana University Publicador: [Bloomington, Ind.] : Indiana University
Tipo: Doctoral Dissertation
EN
Relevância na Pesquisa
36.01%
Thesis (Ph.D.) - Indiana University, Mass Communications/Telecommunications, 2015; The goal of this dissertation was to examine how social comparisons with entertainment television cast members influence emotional responses to reality television programming. Two studies were employed to examine social comparison processes and the relevant factors that influence those comparisons. Both studies were similar in design in that participants viewed a reality or scripted television program and then reported their emotional responses to it. However, the first study utilized a forced exposure environment and the second study implemented a selective exposure environment. There were similarities among the emotional responses to the content across both studies, where generally, viewers experienced stronger social comparison-related emotional responses to scripted programs as compared to reality programs. However, several important differences regarding exposure settings emerged. Negative emotional responses were generally stronger for those in a forced exposure environment than those in a selective exposure environment. Accordingly, positive emotional responses were stronger for those in a selective exposure environment as compared to those in a forced exposure environment. Some participants selected programs for the experience of ‘guilty pleasure...

Modelling the emergence of shared attitudes from group dynamics using an agent-based model of social comparison theory

Van Rooy, Dirk; Wood, Ian; Tran, Eric
Fonte: Wiley Publicador: Wiley
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
35.97%
We propose a novel agent-based implementation of Festinger’s social comparison theory (SCT). The social comparison model (SCM) consists of connectionist networks that simu- late agent-level social comparison processes. Agent networks are combined into an adap- tive network structure that is shaped by social comparisons between individual agents. Simulations show how the SCM produces behavior consistent with the empirical litera- ture on group dynamics. In addition, experimental results are reported that show how the SCM can simulate how critical and conformist norms affect interpersonal processes and emergent attitudes. We conclude that the coupling of simulations and experiments, and the use of psychologically plausible agent models within adaptive network struc- tures, can provide new impetus to the development of models of individual and social cognition. An integrated framework such as the SCM allows investigating key theoretical predictions around the origin and maintenance of socially shared information through so- cial comparisons in fundamentally novel ways.

Social comparison and body image in non or infrequent exercisers and exercisers

Varga, Heather.
Fonte: Brock University Publicador: Brock University
Tipo: Electronic Thesis or Dissertation
ENG
Relevância na Pesquisa
36.03%
Body image refers to an individual's internal representation ofhis/her outer self (Cash, 1994; Thompson, Heinberg, Altabe, & Tantleff-Dunn, 1999). It is a multidimensional construct which includes an individual's attitudes towards hislher own physical characteristics (Bane & McAuley, 1998; Cash, 1994; Cash, 2004; Davison & McCabe, 2005; Muth & Cash, 1997; Sabiston, Crocker, & Munroe-Chandler, 2005). Social comparison is the process of thinking about the self in relation to others in order to determine if one's opinions and abilities are adequate and to assess one's social status (Festinger, 1954; Wood, 1996). Research investigating the role of social comparisons on body image has provided some information on the types and nature of the comparisons that are made. The act of making social comparisons may have a negative impact on body image (van den Berg et ai., 2007). Although exercise may improve body image, the impact of social comparisons in exercise settings may be less positive, and there may be differences in the social comparison tendencies between non or infrequent exercisers and exercisers. The present study examined the nature of social comparisons that female collegeaged non or infrequent exercisers and exercisers made with respect to their bodies...

The Universal Similarity Metric, Applied to Contact Maps Comparison in A Two-Dimensional Space

Rahmati, Sara
Fonte: Quens University Publicador: Quens University
Tipo: Tese de Doutorado Formato: 1411562 bytes; application/pdf
EN; EN
Relevância na Pesquisa
35.97%
Comparing protein structures based on their contact maps is an important problem in structural proteomics. Building a system for reconstructing protein tertiary structures from their contact maps is one of the motivations for devising novel contact map comparison algorithms. Several methods that address the contact map comparison problem have been designed which are briefly discussed in this thesis. However, they suggest scoring schemes that do not satisfy the two characteristics of “metricity” and “universality”. In this research we investigate the applicability of the Universal Similarity Metric (USM) to the contact map comparison problem. The USM is an information theoretical measure which is based on the concept of Kolmogorov complexity. The ultimate goal of this research is to use the USM in case-based reasoning system to predict protein structures from their predicted contact maps. The fact that the contact maps that will be used in such a system are the ones which are predicted from the protein sequences and are not noise-free, implies that we should investigate the noise-sensitivity of the USM. This is the first attempt to study the noise-tolerance of the USM. In this research, as the first implementation of the USM we converted the two-dimensional data structures (contact maps) to one-dimensional data structures (strings). The results of this implementation motivated us to circumvent the dimension reduction in our second attempt to implement the USM. Our suggested method in this thesis has the advantage of obtaining a measure which is noise tolerant. We assess the effectiveness of this noise tolerance by testing different USM implementation schemes against noise-contaminated versions of distinguished data-sets.; Thesis (Master...

Two-digit number comparison

PANG, HYUNMO
Fonte: Quens University Publicador: Quens University
Tipo: Tese de Doutorado Formato: 211866 bytes; application/pdf
EN; EN
Relevância na Pesquisa
36.01%
Magnitudes of numbers influence numerical inequality judgments of people. Do symbols representing numbers also affect numerical inequality judgments? To answer the question, I manipulated digit similarity in two-digit number comparison tasks. During the experiment, the participants took part in two comparison tasks – the judging-larger task and the judging-smaller task. Given pairs of two-digit numbers, the participants were required to make numerical inequality judgments (judging larger or judging smaller). To investigate the effect of digit similarity, two kinds of number pairs were used. Two-digit number pairs consisting of same-digits numbers (e.g., 21 – 12) and two-digit number pairs consisting of different-digits numbers (e.g., 21 – 30) were presented at random. The participants needed more time to compare the same-digits number pairs than the different-digits pairs. The result was independent of the findings in number comparison studies such as the numerical-distance effect (Moyer & Landauer, 1967) and the unit-decade compatibility effect (Nuerk, Weger, & Willmes, 2001). The present study poses challenge to the current theories of two-digit number comparison.; Thesis (Master, Psychology) -- Queen's University, 2009-09-02 11:59:06.647

Toward Mindful Social Comparison: When Subjective and Objective Selves are Mutually Exclusive

Langer, Ellen; Djikic, Maja
Fonte: Elsevier Publicador: Elsevier
EN_US
Relevância na Pesquisa
35.97%
Although mindless evaluations typically accompany social comparisons, they are not necessary, and may be costly. We describe how mindlessness enters the social comparison process at two points. First, during the social comparison both self and other are mindlessly de-contextualized, through (1) biased selection of relevant behaviors, (2) biased selection of criteria along which behaviors are compared, (3) lack of knowledge of intent behind behavior, (4) lack of knowledge about representativeness of behavior, (5) lack of knowledge about typicality of future behavior as moderated by learning, (6) improper understanding of the meaning of behavior, and (7) lack of knowledge about motivations generating the comparisons. Second, the affective results of the social comparison are often mindlessly generalized to the global self, while the breadth and complexity of the network of attributes that constitute to the 'self' is ignored. Global-self-evaluative social comparisons forfeit the potential of gaining accurate and usable information about personal attributes.; Psychology

A generalized model for distributed comparison-based system-level diagnosis

Albini,Luiz Carlos Pessoa; Duarte Jr,Elias Procópio; Ziwich,Roverli Pereira
Fonte: Sociedade Brasileira de Computação Publicador: Sociedade Brasileira de Computação
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/04/2005 EN
Relevância na Pesquisa
36.01%
This work introduces a new system-level diagnosis model and an algorithm based on this model: Hi-Comp (Hierarchical Comparison-based Adaptive Distributed System-Level Diagnosis algorithm). This algorithm allows the diagnosis of systems that can be represented by a complete graph. Hi-Comp is the first diagnosis algorithm that is, at the same time, hierarchical, distributed and comparison-based. The algorithm is not limited to crash fault diagnosis, because its tests are based on comparisons. To perform a test, a processor sends a task to two processors of the system that, after executing the task, send their outputs back to the tester. The tester compares the two outputs; if the comparison produces a match, the tester considers the tested processors fault-free; on the other hand, if the comparison produces a mismatch, the tester considers that at least one of the two tested processors is faulty, but can not determine which one. Considering a system of N nodes, it is proved that the algorithm's diagnosability is (N-1) and the latency is log2N testing rounds. Furthermore, a formal proof of the maximum number of tests required per testing round is presented, which can be O(N³). Simulation results are also presented.

Age Differences in Social Comparison Tendency and Personal Relative Deprivation

Callan, Mitchell J.; Kim, Hyunji; Matthews, William J.
Fonte: Elsevier Publicador: Elsevier
Tipo: Article; accepted version
EN
Relevância na Pesquisa
36.03%
This is the author accepted manuscript. The final version is available from Elsevier via http://dx.doi.org/10.1016/j.paid.2015.08.003; We examined age-related differences in social comparison orientation and personal relative deprivation (PRD). In Study 1, participants (N = 1,290) reported their tendencies to engage in social comparisons and PRD. Older adults reported lower levels of social comparison tendency and PRD, and social comparison tendency mediated the relation between age and PRD. The findings reported in Study 1 were replicated in Study 2 using a sample of participants between the ages of 18 to 30 (n = 180) and 60+ years old (n = 176). Our findings provide evidence that older adults report lower levels of social comparison tendency that, in turn, relate to lower levels of PRD.; This research was funded by a grant from the Leverhulme Trust (RPG-2013-148).

Bayesian Methods for Two-Sample Comparison

Soriano, Jacopo
Fonte: Universidade Duke Publicador: Universidade Duke
Tipo: Dissertação
Publicado em //2015
Relevância na Pesquisa
36.03%

Two-sample comparison is a fundamental problem in statistics. Given two samples of data, the interest lies in understanding whether the two samples were generated by the same distribution or not. Traditional two-sample comparison methods are not suitable for modern data where the underlying distributions are multivariate and highly multi-modal, and the differences across the distributions are often locally concentrated. The focus of this thesis is to develop novel statistical methodology for two-sample comparison which is effective in such scenarios. Tools from the nonparametric Bayesian literature are used to flexibly describe the distributions. Additionally, the two-sample comparison problem is decomposed into a collection of local tests on individual parameters describing the distributions. This strategy not only yields high statistical power, but also allows one to identify the nature of the distributional difference. In many real-world applications, detecting the nature of the difference is as important as the existence of the difference itself. Generalizations to multi-sample comparison and more complex statistical problems, such as multi-way analysis of variance, are also discussed.

; Dissertation

Louis Leon Thurstone in Monte Carlo: creating error bars for the method of paired comparison

Montag, Ethan
Fonte: The International Society for Optical Engineering (SPIE) Publicador: The International Society for Optical Engineering (SPIE)
Tipo: Artigo de Revista Científica
EN_US
Relevância na Pesquisa
36.01%
The method of paired comparison is often used in experiments where perceptual scale values for a collection of stimuli are desired, such as in experiments analyzing image quality. Thurstone’s Case V of his Law of Comparative Judgments is often used as the basis for analyzing data produced in paired comparison experiments. However, methods for determining confidence intervals and critical distances for significant differences based on Thurstone’s Law have been elusive leading some to abandon the simple analysis provided by Thurstone’s formulation. In order to provide insight into this problem of determining error, Monte Carlo simulations of paired comparison experiments were performed based on the assumptions of uniformly normal, independent, and uncorrelated responses from stimulus pair presentations. The results from these multiple simulations show that the variation in the distribution of experimental results of paired comparison experiments can be well predicted as a function of stimulus number and the number of observations. Using these results, confidence intervals and critical values for comparisons can be made using traditional statistical methods. In addition the results from simulations can be used to analyze goodness-of-fit techniques.; RIT community members may access full-text via RIT Libraries licensed databases: http://library.rit.edu/databases/; none

Parasocial comparison: the analysis of a new social comparison target when looking at body satisfaction

Oxley, Lindsey
Fonte: University of Delaware Publicador: University of Delaware
Tipo: Tese de Doutorado
Relevância na Pesquisa
36.1%
Perse, Elizabeth M.; The purpose of this study is to expand upon prior research that explores how media images contribute to body dissatisfaction. This study was grounded in the theory of social comparison which purports that individuals have an innate drive to compare themselves with others. This study focuses specifically on social comparison in relation to body image and body satisfaction. Previous research in this area holds that engaging in social comparison with either friends or media images helps to perpetuate body dissatisfaction. Until now, research explored social comparison only when it occurs between friends or between an individual and a celebrity. This study proposes to expand the domain of this research and test if a parasocial relationship with a thin model/celebrity affects social comparison and resulting body image effects. The hypotheses within this study proposed that engaging in social comparison with a celebrity with whom there existed a parasocial relationship would result in lower levels of body satisfaction. In all, 300 undergraduate female Caucasian students participated in this study during which they were asked questions that pertained to demographics, self-esteem, body satisfaction, and television use. The 205 participants within the experimental group were asked additional questions in regard to parasocial interactions and social comparison. Results from this study showed that individuals experienced lower levels of body satisfaction following social comparison with a thin celebrity. The findings also indicated that engaging in a parasocial relationship increases one’s likelihood to socially compare. Finally...