Purdue University

About: Purdue University is a education organization based out in West Lafayette, Indiana, United States. It is known for research contribution in the topics: Population & Heat transfer. The organization has 73219 authors who have published 163563 publications receiving 5775236 citations. The organization is also known as: Purdue & Purdue-West Lafayette.

Types of Synergy and Economic Value: The Impact of Acquisitions on Merging and Rival Firms

Abstract: Summary Acquisitions, in gene-al, have been demionstrated to create economic valle. The intuitive reason ulndlerlying this value creation stems either firon an ability to redulce costs of the comtibined entity, an ability to charge higher prices, or both. Current research in the area attributes these abilities to an opportutnity to utilize a specialized resource. Oul focus in this study is to comnpare three broad classes of resources that contribute to the creation of value. Following the conventionial wisdom, these r esouirces are classified as cost of capital related (resullting in financial syneergy), cost of production related (resuilting in operational synergy), anid price related (resulting in collusive synergy). Given the limitations of our sample and research design, we find that collusive synergy is, on average, associated with the highest value. Furthem; the resoulrces behind financial synergy tend to create mnore value than the resouirces behind operational synergy.

Developing a community of inquiry instrument : Testing a measure of the Community of Inquiry framework using a multi-institutional sample

Abstract: This article reports on the multi-institutional development and validation of an instrument that attempts to operationalize Garrison, Anderson and Archer's Community of Inquiry (Col) framework (2000). The results of the study suggest that the instrument is a valid, reliable, and efficient measure of the dimensions of social presence and cognitive presence, thereby providing additional support for the validity of the Col as a framework for constructing effective online learning environments. While factor analysis supported the idea of teaching presence as a construct, it also suggested that the construct consisted of two factors-one related to course design and organization and the other related to instructor behavior during the course. The article concludes with a discussion of potential implications of further refinement of the Col measures for researchers, designers, administrators, and instructors.

A Branch and Bound Algorithm for Computing k-Nearest Neighbors

Abstract: Computation of the k-nearest neighbors generally requires a large number of expensive distance computations. The method of branch and bound is implemented in the present algorithm to facilitate rapid calculation of the k-nearest neighbors, by eliminating the necesssity of calculating many distances. Experimental results demonstrate the efficiency of the algorithm. Typically, an average of only 61 distance computations were made to find the nearest neighbor of a test sample among 1000 design samples.

Invasive Plant Suppresses the Growth of Native Tree Seedlings by Disrupting Belowground Mutualisms

Abstract: The impact of exotic species on native organisms is widely acknowledged, but poorly understood. Very few studies have empirically investigated how invading plants may alter delicate ecological interactions among resident species in the invaded range. We present novel evidence that antifungal phytochemistry of the invasive plant, Alliaria petiolata, a European invader of North American forests, suppresses native plant growth by disrupting mutualistic associations between native canopy tree seedlings and belowground arbuscular mycorrhizal fungi. Our results elucidate an indirect mechanism by which invasive plants can impact native flora, and may help explain how this plant successfully invades relatively undisturbed forest habitat.