1,720,956 research outputs found
Wireless Air Mouse Sebagai Alat Bantu Presentasi Menggunakan Inertial Sensor Pendeteksi Pergerakan
Full text linkPada skripsi ini dirancang wireless air mouse sebagai alat bantu presentasi menggunakan sensor inersia yang terdiri dari akselerometer dan giroskop sebagai pendeteksi pergerakan. Mouse dapat digunakan untuk mengontrol gerak kursor pointer pada PC ketika terdapat alas maupun tanpa menggunakan alas. Sensor akselerometer digunakan untuk mengukur percepatan gerak translasi sehingga dapat mengetahui perubahan posisi mouse pada permukaan alas. Sensor giroskop digunakan untuk mengukur laju perubahan sudut sehingga diperoleh perubahan posisi mouse ketika diudara (tanpa alas). Mikrokontroler ARM Cortex M0 seri LPC1114 digunakan sebagai pengolah data hasil pembacaan sensor yang diterjemahkan kedalam perubahan gerak kursor mouse. Koneksi mouse dan PC melalui media RF menggunakan modul bluetooth. Aplikasi desktop yang ter-install pada PC digunakan sebagai driver untuk mengenali perangkat sebagai mouse. Alat yang direalisasikan memiliki dimensi 60 mm X 116 mm dan berat sekitar 99 gram. Hasil pengujian menunjukkan bahwa variasi percepatan gerak mouse pada permukaan alas mempengaruhi hasil pembacaan posisi. Sensor akselerometer memiliki bias error absolute sebesar 22 LSB pada sumbu X, 23 LSB pada sumbu Y dan 48 LSB pada sumbu Z. Pengujian sensor giroskop mengalami drift error dengan laju perubahan 0,03o/s pada poros roll, 0,08 o/s pada poros pitch dan 0,04 o/s pada poros yaw. Jarak penggunaan antara perangkat dan PC maksimal 20 m pada area bebas halangan (line of sight) dan 10 m ketika terdapat halangan. Hasil pengujian perangkat wireless air mouse dapat digunakan pada sistem operasi Windows XP, Windows 7 dan Vista.In this thesis wireless air mouse designed as a tool for presentation using inertial sensors which consisting of accelerometer and gyroscope as detection of movement. Microcontroller ARM Cortex M0 LPC1114 series is used to process the result of the sensor reading and translate it into the alteration of cursor movement. Mouse and PC connected through RF media using bluetooth module. Desktop applications which are installed on the PC used as a driver to recognize the device as a mouse. The realized instrument has dimensions of 60 mm x 116 mm and weighs about 99 grams. The test results showed that the variation in the motion of the mouse acceleration on mouse pads affects the results of the reading position. Accelerometer sensor has a 22 LSB of absolute bias error on the X-axis, 23 LSB on the Y axis and 48 LSB on the Z axis. Test result of gyroscope sensor having drift rate of change of error with 0.03o / s on the roll axis, 0.08o/ s on the pitch axis and 0.04o/ s on the yaw axis. The distance between the device and PC usage up to 20 m in line of sight area and 10 m when outdoors. The testing result of wireless air mouse can be used on Windows XP, Windows 7 and Vista operating systems
Penampil Informasi Really Simple Syndication (RSS) pada Moving Sign Display Menggunakan Komunikasi General Packet Radio Service (GPRS)
Full text linkAlat yang dirancang pada skripsi ini mampu membaca informasi Really Simple Syndication (RSS) dan menampilkannya pada Moving Sign Display (MSD). Alat ini dirancang agar update infomasi dapat dilakukan secara otomatis dan berkala tanpa perlu operator yang selalu berada di lokasi MSD. Sehingga proses update informasi menjadi lebih efisien, dan kepentingan akan informasi yang up-to-date dapat terpenuhi. Pengguna diberikan lima pilihan kategori informasi yang akan ditampilkan pada MSD. Sepuluh informasi terbaru akan ditampilkan, dan akan diupdate secara otomatis. Informasi yang ditampilkan merupakan umpan web (web feed) dari situs yang menyediakan RSS. Untuk dapat melakukan koneksi internet, SIM300, yang memiliki fitur GPRS digunakan sebagai modem. Dari hasil pengujian alat secara keseluruhan, didapatkan hasil bahwa informasi yang ditampilkan pada MSD berupa judul dan deskripsi berita, sesuai dengan informasi yang terdapat pada RSS feed dari situs internet yang diakses
Gain Minimum untuk Menjaga Stabilitas Non-inverting Amplifier Op Amp yang Berbeban Kapasitif
No full textNon-inverting amplifier is one of the two basic operational amplifier (op amp) circuits. In this type of amplifier product between close loop gain at zero hertz (ADC) and bandwidth (BW) will be constant and equal to unity-gain frequency (ft). A capacitive load (CL) together with op amp output resistance (R0) will create a new pole at frequency fp, thus modifying frequency response of the amplifier. If ft greater than fp , a non-inverting amplifier might become unstable by having a high overshoot on its step response. One of the references used in this paper stated that the amplifier will be stable if ADC equal or greater than 10.(fp/ft). This paper explains that we can choose ADC much lower than 10.(fp/ft) while maintaining a relatively stable non-inverting amplifier. This conclusion agrees with simulation and measurement results.
Abstract in Bahasa Indonesia :
Non-inverting amplifier merupakan salah satu konfigurasi dasar amplifier berbasis op amp. Pada amplifier ini, hasil perkalian antara close loop gain pada frekuensi nol (ADC) dengan bandwidth (BW) akan bernilai konstan yaitu sebesar unity-gain frequency (ft) op amp yang dipakai. Sebuah beban kapasitif pada non-inverting amplifier bersama hambatan keluaran op amp (Ro) akan menciptakan satu kutub (pole) tambahan (fp) yang memodifikasi respon frekuensi amplifier. Apabila fp lebih kecil daripada ft maka amplifier dapat menjadi tidak stabil, yang ditunjukkan dengan adanya overshoot pada step response keluaran. Salah satu acuan yang dipakai menyatakan bahwa amplifier akan mencapai kestabilan bila dipenuhi nilai ADC minimal (ADCmin) sebesar 10.(ft/fp). Makalah ini menjelaskan bahwa kita dapat memilih ADC yang jauh lebih kecil dibandingkan 10.(ft/fp) dengan tetap mempertahankan kestabilan relatif non-inverting amplifier. Kesimpulan ini didukung oleh hasil simulasi perangkat-lunak dan pengujian amplifier secara riil.
Kata kunci: Non-inverting amplifier, beban kapasitif, kestabilan, gain minimum
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
Gain Minimum Untuk Menjaga Stabilitas Non-inverting Amplifier Op Amp Yang Berbeban Kapasitif
Full text linkNon-inverting amplifier is one of the two basic operational amplifier (op amp) circuits. In this type of amplifier product between close loop gain at zero hertz (ADC) and bandwidth (BW) will be constant and equal to unity-gain frequency (ft). A capacitive load (CL) together with op amp output resistance (R0) will create a new pole at frequency fp, thus modifying frequency response of the amplifier. If ft greater than fp , a non-inverting amplifier might become unstable by having a high overshoot on its step response. One of the references used in this paper stated that the amplifier will be stable if ADC equal or greater than 10.(fp/ft). This paper explains that we can choose ADC much lower than 10.(fp/ft) while maintaining a relatively stable non-inverting amplifier. This conclusion agrees with simulation and measurement results
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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