1,721,082 research outputs found
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
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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
Humanoid Robot Intelligent Walking Control
No full text為了達成智慧型機器人的穩定行走，本論文的目的在於建立機器人全身重心軌跡規劃器、即時重心軌跡與腳步改變控制器、腳踝穩定控制器、視覺輔助腳步軌跡規劃器，由這些控制器的組合，人型機器人才能穩定地行走在崎嶇的路面上，智慧地判斷並規劃出適合自己行走的路徑。最後，為了減少移動能量與重量，我們設計出較大荷重與質量比值的腳部機構來安裝在重量被嚴格受限的人型機器人上。重心軌跡規劃生成方面，我們使用Preview Control 來生成重心軌跡，但有鑑於此控制方法，有著不易即時改變步態的缺點，所以我們提出了腳步即時改變控制器，結合此兩種控制器的優點，可使機器人達到步態與重心的即時規劃，以及更高的行走自由度。而腳踝穩定控制器是用來強化機器人的行走穩定性，藉由此控制器，可以穩定地行走於大部分的小崎嶇路面。視覺是機器人的智慧之窗，所以我們靠著機器人立體視覺的寶貴資訊加上視覺輔助行走軌跡規劃，賦予機器人智慧，這種智慧可以讓機器人分析自己身處的環境，並進一步分析出障礙物位置分佈與可行走的路徑，憑藉著兩者的結合，機器人能獨立地行走至目的地。最後，為了減少移動能量與重量，我們利用有限元素應力分析，來去除多餘的材料，並保持結構的強度，設計出較荷重與質量比值的腳部機構。們模擬的物理環境均建立在ADAMS上，而所有的控制程式均在MATLAB上撰寫，兩者透過MATLAB的Simulink做連結。而機構的應力分析應用SolidWorks之CosmosWorks軟體做驗證。鍵字: Preview Control、腳踝穩定器、軌跡規劃、回饋線性化、強韌控制、軌跡即時變化。To achieve stable walking by an intelligent humanoid robot, this thesis proposes a center of gravity (COG) trajectory planner, immediate change footstep controller, ankle stabilizer, and stereo vision assisted footstep planner. After assembling these elements, the humanoid robot walked stably on rugged terrain and explored a road suitable for walking. Finally, to reduce energy and weight, we designed a leg mechanism with a larger weight to mass ratio for use on our strictly weight-limited humanoid robot.or COG trajectory generation, we used a preview control COG generator for intelligent walking. Due to the difficulties after a sudden change of footsteps, we proposed an immediate modification of the foot placement controller. Combining the advantages of the two controllers, we planned the footsteps and COG trajectory dynamically and the robot walked more freely. The ankle stabilizer was implemented to reinforce walking stability. Utilizing the controllers, our robot walked stably on the most rugged terrain. Finally, stereo vision is the window into the core of our humanoid robot. We made our humanoid robot more intelligent by composing stereo vision data and dynamic footstep planning. With this intelligence, the robot could analyze, all by itself, its environment and find the locations of obstacles, accessible regions, and the route to its destination. Finally, in order to reduce the weight and energy consumption of the humanoid robot, we used Finite Element stress analysis to remove any unnecessary materials and, on the other hand, to keep the structure strong enough to maximize the payload.inally, our simulation physical environment was constructed on ADAMS, and all of the control code was built in MATLAB. These two environments are connected by Simulink in MATLAB. Stress analysis was done using COSMOSWorks in SolidWorks.誌謝 i要 iibstract ivontents viist of Tables viiiist of Figures ixhapter 1 Introduction 1 1.1 Motivation 1 1.2 Related Works 3 1.2.1 Autonomous Navigation 4 1.2.2 Stable Gait Generation 5 1.2.3 Stabilization Controller 7 1.3 Thesis Organization 9 1.4 Contribution 10hapter 2 Kinematics of Robotics System and Preview Control 12 2.1 Forward Kinematics 12 2.2 Inverse Kinematics 13 2.2.1 Singularity Avoidance 13 2.2.2 Joint Limit Avoidance 15 2.3 Walking Pattern Generation 17 2.3.1 Preview Control Based Walking Pattern Generation 19 2.4 Immediately Change of Foot Placement 25 2.4.1 Introduction 25 2.4.2 Double Support Phase Trajectory 26 2.4.3 Single Support Phase Trajectory 28 2.4.4 Connection of Single and Double Support Phase 30 2.4.5 Simulations 32 2.5 Summary 35hapter 3 Controller Design 36 3.1 Introduction 36 3.2 Ankle Based Posture Controller 37 3.2.1 Dynamics Modeling 37 3.2.2 Controller Design 42 3.3 Simulations 43 3.4 Summary 49hapter 4 Momentum Control 51 4.1 Introduction 51 4.2 Momentum Equation 53 4.2.1 General Form 53 4.2.2 Momentum about the Foot of the Fixed Leg 54 4.3 Jacobian Matrix 56 4.3.1 Fixed Leg Jacobian 56 4.3.2 COG Jacobian 60 4.4 Jacobian for Momentum Control 64 4.5 Summary 71hapter 5 Vision-Guided Footstep Planning 72 5.1 Introduction 72 5.2 Environment Model 74 5.3 Planning Algorithm 77 5.3.1 Overview 77 5.3.2 A* Planner 77 5.4 Path Smoothing 82 5.5 Summary 85hapter 6 Mechanism Design 87 6.1 Introduction 87 6.2 Mechanical Structure Design 88 6.2.1 Arrangement of the Joints 88 6.2.2 Movable Range of Joints 89 6.2.3 Selection of Materials 91 6.2.4 Structure Stress Analysis 92 6.3 Selection of Actuators and Transmission 99 6.3.1 Actuator 99 6.3.2 Transmission 102hapter 7 Conclusions 106 7.1 Conclusions 106 7.2 Future Works 108eferences 10
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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