1,720,986 research outputs found
Radiation Detection by Employing Periodic Packets in Power-Line Communication System
No full textThe interference with existing radio broadcasting services because of unintentional radiation is a serious\ud
problem in power-line communication (PLC) systems. A radiation detection method based on burst packets,\ud
which had been proposed by the authors and was called scan and sum (SAS) method, was a low cost method\ud
and used to solve the problem. But its measurement took a long time and the burst packets occupied a\ud
channel. To shorten the measurement time, a new method based on periodic packets has been proposed in\ud
this paper, which is called periodic packet sound (PPS) method. Although both methods record the radiated\ud
signal as a sound data, the PPS does not need to scan the frequency of an AM radio receiver but analyses\ud
the sound data by a cross-correlation operation with a reference signal. First, how to generate the reference\ud
signal that depends on the modems is described. Second, an optimization of the packet size is studied, and\ud
finally it is shown that the detection sensitivity of PPS was maintained to be the same as SAS while the\ud
measurement time of PPS was 1/9 shorter than that of SAS. Moreover, the channel occupation of PPS was\ud
reduced to be 2% of SAS when the packet size was optimized to be 1500 bytes
Hybrid RF-Energy Harvester for IoT Smart Device Applications Low Power Consumption
Full text linkEnergy independence and long battery lifetime, the vision of 5G technology is one of them for IoT smart devices. Focusing on the challenges in this technological vision, the solution for this system is to harvest the energy sources around it as a backup or eliminate the use of batteries. The output of the hybrid energy harvester method as a solution to energy independence using radio frequency (RF) waves has been optimized in this study. The double-T patch microstrip antenna based on CSRR metamaterial as an RF energy harvester works at the ISM band frequency of 2.45 GHz and has return loss, gain and bandwidth values that are in accordance with the concept of the RF-Energy harvester system. This antenna is capable of absorbing energy using a DC converter circuit at a maximum distance of 6.79 V using 2 access points at the position of the transmitting antenna facing each other with a conversion efficiency of 6.68%. One method to maximize the output of the energy harvester is also carried out in this study by doing a hybrid with a mini solar cell, which is able to carry out constant voltage and can charge the load in the form of a cellphone. The hybrid RF-Energy harvester system designed in this research can be used as a source of energy in smart devices with small power requirements
IMPLEMENTASI TRANSFER DATA BERKECEPATAN TINGGI MELALUI MEDIA SALURAN TRANSMISI DAYA LISTRIK BERSKALA LABORATORIUM
Full text linkSistem telekomunikasi berkembang sangat pesat beberapa decade terakhir ini. Hal tersebut mendorong perkembangan teknologi jaringan dan berbagai system layanan komunikasi yang terkait. Teknologi Power Line Communication (PLC) merupakan teknologi yang menarik dan menjanjikan karena menggunakan infrastruktur system transmisi kelistrikan eksisting sebagai media komunikasi dan memiliki tingkat penetrasi koneksi di tengah masyarakat yang sangat tinggi dan merambah hingga seluruh pelosok Tanah Air Indonesia. Teknologi PLC ini tidak memerlukan penambahan kabel data untuk komunikasinya dan media komunikasi yang digunakan tersedia sampai kepelosok desa terpencil sekalipun. Penelitian tentang PLC sangat aktif dilakukan mengingat teknologi ini mendukung program green technology yang ramah lingkungan dan memiliki kelebihan dari segi estetika. Komunikasi data yang memanfaatkan ketersediaan infrastruktur saluran listrik, saat ini, bukanlah merupakan suatu konsep siteknologi komunikasi alternative bagi masyarakat lagi melainkan telah terimplementasi di beberapa tempat dan diperuntukkan untuk berbagai aplikasi yang masih terbatas. Sehingga perlu kiranya dukungan yang lebih serius bagi kajian dan pengembangan komunikasi data melalui saluran listrik untuk direalisasikan, sebagai contoh untuk mewujudkan impian akan terbentuknya smart laboratory khususnya di Jurusan Teknik Elektro Universitas Hasanuddin sebagai sebuah project percontohan teknologi PLC. Penelitian ini merupakan langkah awal untuk mewujudkan sebuah laboratorium cerdas (smart laboratory) dengan memanfaatkan teknologi PLC untukmengontrol laboratory environment sehingga penggunaan energy listrik dapat lebih efisien. Mengingat karakteristik saluran listrik tidak stabil dan berubah terhadap waktu, lokasi, dan peralatan yang terhubung kesaluran tersebut. Maka pada penelitian ini, redaman dan noise pada saluran listrik menjadi parameter yang dianalisis untuk menggambarkan karakteristik saluran listrik jika digunakan sebagai media komunikasi.Implementasi teknologi PLC ini dilakukan di laboratorium Telekomunikasi Radio dan Gelombang pendek Jurusan Teknik Elektro Universitas Hasanuddin
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
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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