Texas Christian University

About: Texas Christian University is a education organization based out in Fort Worth, Texas, United States. It is known for research contribution in the topics: Population & Poison control. The organization has 3245 authors who have published 8258 publications receiving 282216 citations. The organization is also known as: TCU & Texas Christian University, TCU.

Persistence images: a stable vector representation of persistent homology

Abstract: Many data sets can be viewed as a noisy sampling of an underlying space, and tools from topological data analysis can characterize this structure for the purpose of knowledge discovery. One such tool is persistent homology, which provides a multiscale description of the homological features within a data set. A useful representation of this homological information is a persistence diagram (PD). Efforts have been made to map PDs into spaces with additional structure valuable to machine learning tasks. We convert a PD to a finite-dimensional vector representation which we call a persistence image (PI), and prove the stability of this transformation with respect to small perturbations in the inputs. The discriminatory power of PIs is compared against existing methods, showing significant performance gains. We explore the use of PIs with vector-based machine learning tools, such as linear sparse support vector machines, which identify features containing discriminating topological information. Finally, high accuracy inference of parameter values from the dynamic output of a discrete dynamical system (the linked twist map) and a partial differential equation (the anisotropic Kuramoto-Sivashinsky equation) provide a novel application of the discriminatory power of PIs.

A contextual examination of new venture performance: entrepreneur leadership behavior, top management team heterogeneity, and environmental dynamism

Abstract: Summary This study examined the relationship of entrepreneur leadership behavior (empowering and directive), top management team heterogeneity (functional, educational specialty, educational level, and skill) and industry environmental dynamism (rate of unpredicted change in number of industry establishments, number of industry employees, industry revenue, and industry research and development intensity) on new venture performance (revenue growth and employment growth) using two different samples—the Inc. 500 list of America’s fastest growing startups and a national (United States) random sample of new ventures. In dynamic industry environments, startups with heterogeneous top management teams were found to perform best when led by directive leaders and those with homogenous top management teams performed best when led by empowering leaders. Conversely in stable industry environments, startups with heterogeneous top management teams were found to perform best when led by empowering leaders and those with homogenous top management teams performed best when led by directive leaders. These findings were consistent across both samples and demonstrate the value in a contextual approach to leadership, which considers adjusting leadership behavior in accordance to factors that are both internal and external to the firm. Copyright # 2007 John Wiley & Sons, Ltd.

Turnaround in East Asian firms: evidence from ethnic Overseas Chinese communities

Abstract: Research done primarily in the United States has shown that firms in decline enjoy better odds of returning to health when strong measures are taken. The culture of the Overseas Chinese of East Asia has helped to shape the region's prior commercial success but it also impacts responses to firm decline and turnaround. This research provides the first empirical investigation of the turnaround strategies of Overseas Chinese firms in East Asia. The evidence gathered shows that the utility of the predominantly U.S. model of firm turnaround has limits in East Asia. In particular, the role of strong owner-managers and the importance of relationships among business people constrain the applicability of prior U.S. research to East Asia. Copyright © 2003 John Wiley & Sons, Ltd.

A world of lies

Abstract: This article reports two worldwide studies of stereotypes about liars. These studies are carried out in 75 different countries and 43 different languages. In Study 1, participants respond to the open-ended question “How can you tell when people are lying?” In Study 2, participants complete a questionnaire about lying. These two studies reveal a dominant pan-cultural stereotype: that liars avert gaze. The authors identify other common beliefs and offer a social control interpretation.