1,720,962 research outputs found
Topological criterion for selection of quintic Pythagorean-hodograph Hermite interpolants
No full textChoi, Hyeong In; Farouki, Rida T.; Kwon, Song-Hwa; Moon, Hwan Pyo. (2006). Topological criterion for selection of quintic Pythagorean-hodograph Hermite interpolants. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/4320
Two-dimensional offsets and medial axis transform
No full textChoi, Hyeong In; Choi, Sung Woo; Han, Chang Yong; Kim, Tae-wan; Kwon, Song-Hwa; Moon, Hwan Pyo; Roh, Kyeong Hah; Wee, Nam-Sook. (2006). Two-dimensional offsets and medial axis transform. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/4313
A 2-stage hybrid position estimation framework in RF fingerprint WPS
No full textThe rapid growth of mobile communication and the proliferation of smart phones have drawn significant attention to Location Based Services (LBS). One of the most important factors in the vitalization of LBS is the accurate position estimation of a mobile device. By focusing on an access points (AP) probabilistic existence, we develop an AP distribution map and a new position estimating framework. The developed approach can significantly enhance a radio fingerprint-based Wi-Fi Positioning System, especially in terms of the algorithms and data management. In comparison with existing approaches of fingerprint pattern matching algorithms, we achieve an improved performance in terms of both the average and deviation of the estimation error. All fingerprint data used in the developed test-bed are harvested from actual radio fingerprint measurements taken throughout Seoul, Korea. This demonstrates the practical usefulness of the proposed methodology.1
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
강건우
No full text학위논문 (석사)-- 서울대학교 대학원 : 수리과학부, 2014. 8. 최형인.This paper will be focused on applying machine learning to predict the possibilities for firms to default. The data selected for this modeling are firms from United States between 2008 and 2012. We will use logistic regression and support vector machines, two major classification model from machine learning to forecast the risk of default. The result will be compared when different features are selected. Furthermore, we will discuss the strength of each method by comparing the result.1. Introduction 1
2. Machine Learning Methods 3
2.1 Logistic Regression 4
2.2 Support Vector Machine 8
3. Data and method apply 13
3.1 Data selection 13
3.2 Feature selection 14
3.3 Measurements 15
4. Results and analysis 17
4.1 General result and analysis 17
4.2 Practical Analysis 19
5. Conclusion 23
Bibliography 24Maste
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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