1,721,052 research outputs found
Discovering Optimal Release Conditions for the Javelin World Record Holders by Using Computer Simulation
Get PDFpurpose of this study is to use computer simulation to establish the optimal release conditions for javelin world record holders. The researcher adopted the data on the relationship between the attack angle and the distance from COM (the javelin’s cente
Computer Algorithm of Optimal Planning for the Support of a Single Leg
Get PDFWalking, jumping, and running (WJR) are inborn abilities of human beings. Since these three motions are indispensable to our daily lives, it is worthy of our exploration to enhance their exercise efficiency. In terms of biomechanics, performing these thr
Computer Simulation of the Relationship between Flat Service and Service Return in Tennis Singles
Get PDFIn tennis singles matches, the serving players try hit an ace by placing the ball to their advantage. In contrast, the receiving players try to position themselves for the best defence to return the ball in time and avoid losing points. This study is an
Computer Algorithm of Optimal Planning for Single-hand Suspension Motion
Get PDFThe primary purpose of this study was to design a set of algorithm, which can compute the optimal trajectory (OT) for 3D human single-hand suspension motion. To achieve this goal, the study first established a 15-segment human body model (HBM). Then base
Estimating the Optimal Release Conditions for World Record Holders in Discus
Get PDFThe purpose of the study is to estimate the optimal release conditions for male and female world discus record holders of 1998 under no wind and in the wind. The estimation was achieved by using numerical methods to deal with the lift and drag coefficien
[[alternative]]The Study of The Dynamic Modeling For the Support Phase in Running
No full text[[abstract]]Department of Physical Education National Taiwan Normal University Doctor's Thesis
Graduate Student : Chiu, Ching-Hua
Advisor: Wang, Jin-Cherng
The Study of The Dynamic Modeling For the Support Phase in Running
Abstract
The purpose of this study was to construct a human dynamic modeling system about the motion for the support phase in running. The function of this system was to simulate for the support phase the ground reaction force as well as the moment, the power , and the relative angular momentum of major body joints. As to the research methods, the structure of the body joints was claimed to be a multivariable system divided into thirty-eight degrees of freedom. In order for this system to be expanded into a human motion control system, this study adopted Lagrange-Euler equtions. But the Denavit-Hartenberg matrix used by other scholars in the past was not applied; instead, this study utilized Basic Homogeneous Rotational Matrices and Basic Homogeneous Translation Matrices to define seven-type homogeneous transformation matrix, thus making this dynamic system both applicable to branching body system and convertible into state space equations. Then one force plate (Kislter)and two cameras (Peak Performance) were used to obtain the relative data about the motion of the subject(age:22 ;height:1.81m; weight:75kg) for the support phase in running. After simulating by means of C++ programs designed in person, the findings showed that this dynamic system was really competent in simulating the ground reaction force,the moment , the power , and the relative angular momentum of major body joints.
Keywords: Support phase、Matrix、Moment、Power、Angular momentum
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Variations on the Author
Get PDF“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
Get PDFWe 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
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