1,720,972 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
Pengaturan Kecepatan Motor Induksi Tanpa Sensor Kecepatan dengan Metoda Direct Torque Control Menggunakan Observer Recurrent Neural Network
No full textThis paper describes about development of sensorless control for three phase induction motor speed which is operated by Direct Torque Control (DTC). Induction motor speed is identified by an Observer. Current supply and Stator Voltage are ruquired by Observer to gain Motor Speed Estimation. Observer for motor speed identification is developed using Artificial Neural Network (ANN) Method and Recurrent Neural Network (RNN) learning algorithm. The simulation results using MathLab/Simulink show that on PI controller with Recurrent Neural Network (RNN) observer, there are the overshoot 7,0224%, rise time 0,0125 second and settling time 0,364 second with reference speed 77,9743 rad./sec.
Abstract in Bahasa Indonesia:
Penelitian ini membahas pengembangan kontrol pada kecepatan motor induksi tiga fasa tanpa sensor kecepatan (speed sensorless) yang dioperasikan dengan metoda Direct Torque Control (DTC). Kecepatan motor induksi diidentifikasi oleh suatu observer. Estimasi kecepatan motor oleh observer memerlukan masukkan arus dan tegangan stator. Observer untuk identifikasi kecepatan motor menggunakan metode Artificial Neural Network (ANN) dengan algoritma pembelajaran menggunakan Recurrent Neural Network (RNN). Hasil simulasi menggunakan matlab-simulink menunjukkan saat motor diberikan kecepatan referensi 77,9743 rad/detik terjadi overshoot 7,0224% , rise time 0,0125 detik dan settling time 0,364 detik.
Kata Kunci: direct torque control, speed sensorless, recurrent neural networ
Pengaturan Kecepatan Motor Induksi Tanpa Sensor Kecepatan dengan Metoda Direct Torque Control Menggunakan Observer Recurrent Neural Network
No full textThis paper describes about development of sensorless control for three phase induction motor speed which is operated by Direct Torque Control (DTC). Induction motor speed is identified by an Observer. Current supply and Stator Voltage are ruquired by Observer to gain Motor Speed Estimation. Observer for motor speed identification is developed using Artificial Neural Network (ANN) Method and Recurrent Neural Network (RNN) learning algorithm. The simulation results using MathLab/Simulink show that on PI controller with Recurrent Neural Network (RNN) observer, there are the overshoot 7,0224%, rise time 0,0125 second and settling time 0,364 second with reference speed 77,9743 rad./sec.
Abstract in Bahasa Indonesia:
Penelitian ini membahas pengembangan kontrol pada kecepatan motor induksi tiga fasa tanpa sensor kecepatan (speed sensorless) yang dioperasikan dengan metoda Direct Torque Control (DTC). Kecepatan motor induksi diidentifikasi oleh suatu observer. Estimasi kecepatan motor oleh observer memerlukan masukkan arus dan tegangan stator. Observer untuk identifikasi kecepatan motor menggunakan metode Artificial Neural Network (ANN) dengan algoritma pembelajaran menggunakan Recurrent Neural Network (RNN). Hasil simulasi menggunakan matlab-simulink menunjukkan saat motor diberikan kecepatan referensi 77,9743 rad/detik terjadi overshoot 7,0224% , rise time 0,0125 detik dan settling time 0,364 detik.
Kata Kunci: direct torque control, speed sensorless, recurrent neural networ
Pengaturan Switching Boost Converter Menggunakan Logika Fuzzy pada Sistem Solar Cell Sebagai Tenaga Alternatif
No full textEnergi surya merupakan salah satu sumber energi terbarukan yang tersedia tidak terbatas di alam. Untuk mendapatkan energi listrik yang berasal dari matahari diperlukan panel surya yang mengubah energi cahaya dari matahari menjadi energi listrik. Energi surya yang dihasilkan oleh panel surya 50 Watt Peak (WP) berkisar antara 9 Volt – 20 Volt. Untuk mendapatkan tegangan pengisian accu 48 Volt diperlukan suatu rangkaian boost converter yang berfungsi menaikkan tegangan menjadi 50 Volt. Untuk mendapatkan tegangan konstan dari converter dilakukan pengaturan duty cycle dengan cara memberikan umpan balik dari tegangan keluaran converter itu sendiri. Pada proyek akhir ini dirancang sistem pengendalian duty cycle boost converter menggunakan Fuzzy Logic Controller berbasis mikrokontroler sehingga dapat mengatur duty cycle untuk menjaga tegangan keluaran konstan 50 Volt. Konverter boost dengan control Fuzzy pada proyek akhir ini telah berhasil menaikkan tegangan masukkan yang berkisar 9 – 20 Volt menjadi 50 Volt sehingga dapat mengisi accu 48 Volt dengan arus pengisian maksimal 0.6 Ampere.
Kata kunci: boost converter, duty cycle, PWM, fuzzy logic controlle
Penerapan Kontrol PI Pada Alat Pengaduk dan Pengukus Adonan Pudak untuk Meningkatkan Hasil Produksi Industri Rumah Tangga di Gresik
Full text linkAbstrak Seiring dengan semakin berkembangnya kemajuan teknologi di era modern ini, membawa manusia untuk terus melakukan inovasi-inovasi dan kreasi guna memanfaatkan kemajuan teknologi yang ada, khususnya dibidang perindustrian baik skala besar maupun industri rumahan. Dibidang perindustrian kebutuhan sistem kontrol yang efektif dan efisien sangat diperlukan untuk mempermudah, menghemat atau mempersingkat waktu kerja dan tenaga pada sebuah proses produksi. Dalam hal ini sebuah plant yang akan digunakan adalah motor DC sebagai pengaduk dan heater sebagai pengukus pada proses industri rumahan pembuatan makanan khas Gresik “Pudak”. Adapun yang sering menjadi kendala dari industri rumahan adalah tidak mampu memenuhui permintaan dengan jumlah besar dan lamanya proses produksi.Solusi dari permasalah ini adalah merancang dan membuat alat produksi pudak secara semi-otomatis, dengan menggunakan kontrol Propotional Integral (PI) pada setiap sistemnya. Pada sistem yang diusulkan, proses pengadukan kecepatan motor dijaga secara konstan selama 10 menit dengan nilai parameter Kp=10 dan Ki=5. Setelah itu pada proses pengukusan suhu dijaga konstan sekitar 900C selama ± 90 menit, dengan nilai Kp=75 dan Ki=5.0. Kemudian setelah seluruh proses selesai maka buzzer akan berbunyi sebagai tanda bahwa prsoses pembuatan pudak telah selesai. Kata kunci : proses kontrol, industry rumah tangga, kontrol P
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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