1,720,978 research outputs found
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
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
Perancangan Kontrol Direct-Drive Robot Arm Dengan Menggunakan Sliding Mode Control
No full textRobot lengan direct-drive arm memiliki sistem dinamik nonlinear berupa fungsi inersia dan central coriolis dan gangguan berupa pengaruh gaya gesekan dan gravitasi. Pada penelitian ini sliding mode control dirancang untuk mengendalikan robot lengan agar dapat bergerak sesuai dengan posisi dan kecepatan yang diinginkan. Pada penelitian ini dilakukan perancangan sliding mode control pada robot lengan direct-drive arm secara matematis kemudian dilakukan penghitungan kestabilan sistem dengan menggunakan metode Lyapunov. Untuk memverifikasi sistem kendali yang dirancang dilakukan simulasikan pada Simulink Matlab. Berdasarkan hasil simulasi, sliding mode control mampu mengontrol posisi dan kecepatan robot lengan secara asimptotik. Error yang didapat sangat kecil yaitu 0.000875 (error posisi) dan 0.001295 (error kecepatan) untuk set point konstan, 0.000435 (error posisi) dan 0.001032 (error kecepatan) untuk set point sinusoidal, 0.004345 (error posisi) dan 0.005207 (error kecepatan) untuk set point kondisi awal beda. Robot lengan memiliki akurasi pergerakan yang lebih tinggi saat gain k=100 dibandingkan pada saat gain k=0,1 , akan tetapi proses simulasi saat k=0,1 lebih cepat dibandingkan saatk=100.
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Direct-drive robot arm has nonlinear dynamics such as functions of inertia and coriolis and disturbances such as the effects of friction and gravitation. In this reserach, sliding mode control is developed to control the robot arm to follow the desired position and velocity. In this resrearch, sliding mode control is proposed to maintain direct-drive arm robot, then Lyapunov stability theorem is applied to analyze the stability. Simulink Matlab is used for simulation in order to verify the proposed control design. Based on simulation results, sliding mode control is able to stabilize robot arm asymptotically. Error system are 0.000875 and 0.001295 for error position and velocity respectively, where set point is constant 1. For desired trajectories are in the form of sinusoidal, the error systems are 0.000435 and 0.001032 for error position and velocity respectively, where the initial conditions of both arms are equal. In the case of different initial conditions, the error systems are 0.004345 and 0.005207 for error position and velocity respectively. The accuracy of controller is higher for k = 100 compared to k = 0.1, however the simulation process for k = 0.1 is faster than k = 100
PERANCANGAN DAN IMPLEMENTASI SISTEM KENDALI PID SEBAGAI PENGONTROL KECEPATAN ROBOT MOBIL PADA LINTASAN DATAR, TANJAKAN, DAN TURUNAN
Full text linkPengontrolan kecepatan motor DC servo merupakan salah satu permasalahan dalam perkembangan robot mobil. Penggunaan sensor encoder sebagai sensor kecepatan robot mobil yang bergerak pada lintasan bervariasi adalah salah satu input untuk proses otomatisasi itu sendiri. Pengendali PID (Proportional Integral Derivative) adalah pengendali berumpanbalik yang paling popular di dunia industri sebagai pengontrol motor. Dalam tugas akhir ini dilakukan perancangan dan implementasi sebuah robot mobil dengan menggunakan pengendali PID sebagai pengontrol kecepatan. Pencarian nilai Kp, Ki, dan Kd pada penelitian ini ditetapkan dengan metode Ziegler Nichols. Sistem kendali yang dibuat merupakan kendali loop tertutup yang diimplementasikan pada bahasa pemograman Visual Basic 6.0, dan pada mikrokontroler adalah bahasa C. Input sistem kendali PID adalah sensor encoder yang menunjukkan nilai kecepatan aktual robot mobil. Keluaran dari sistem ini berupa PWM yang akan menggerakkan motor dan kecepatan aktual robot akan menjadi sinyal umpan balik ke pengendali. Dari hasil pengujian dan analisa sistem diperoleh hasil bahwa sistem stabil menurut kestabilan routh. Percobaan kontrol motor DC servo dengan pengendali PID menghasilkan galat steady state pada rentang 0% hingga 19.047%
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
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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