1,721,005 research outputs found
Prototyping of e-fisherman web server to support Indonesian fishermen’s activities
Get PDFThis paper presents a webserver for Indonesian fishermen, to support fishing activities. This is one of the sub-systems of e-Nelayan (in English: eFisherman) architecture, which was connected to e-Nelayan Apps; it helps to provide interaction between two users, including the administrators and fishermen. Using hypertext preprocessor (PHP) language, the website was developed to function on an Apache web server, with the adaptation of my structured query language (MySQL) framework for the database. This system was subsequently divided into two parts: (1) the front-end, which is responsible for the accessibility of data collection and (2) the back-end, where administrators update or modify crucial information: price, fishing result, illegal activity report, save our ship! (SOS) potential fish zone, and ship tracking. The administrators are unable to update the real-time weather information for the front-end part. The application was found to record the information obtained from the fishermen through the e-Nelayan apps and meteorology, climatology, and geophysical agency (BMKG in Indonesian). This web system is expected to carry out the following functions: to ensure easier interactions between fishermen and administrators, to enable easy update of information, to promote monitoring and recording of results, and to ensure fishermen’s safety
Rancang Bangun Layer Fisik Visible Light Communication Pada Sistem Transmisi Audio
Full text linkKini, fungsi LED tidak hanya sebagai penerangan saja, melainkan dapat dimanfaatkan sebagai media komunikasi. Teknologi ini lazim disebut sebagai komunikasi cahaya tampak atau VLC, yang mana telah mulai diaplikasikan pada area-area yang rentan gelombang elektromagnetik seperti rumah sakit, kabin pesawat, bandara, markas militer dan lain sebagainya. Media yang umumnya dijadikan objek transmisi data adalah berupa gambar, video, audio (musik), teks, bahkan paket data untuk keperluan browsing internet. Penelitian ini mengimplementasikan sistem VLC yang berfokus pada layer fisik, yakni pada bagian Analog Front-End (AFE). Sistem yang dirancang terdiri atas modul AFE transmitter sebagai modulator dan AFE receiver sebagai demodulator. Rancangan AFE transmitter mengadopsi prinsip dari modul Bias-T, dengan fungsi yang sama namun memiliki keunggulan pada sisi low-cost. Sedangkan pada bagian AFE receiver, terdapat modul DC-offset remover yang berfungsi untuk mereduksi sinyal DC dari ambient light. Hasil demonstrasi menunjukkan bahwa sistem secara fungsional dapat digunakan untuk transmisi sinyal audio via cahaya tampak dan secara langsung ditampilkan ke loudspeaker yang mana pengamatan dilakukan secara langsung dengan membandingkan amplitude sinyal input ke LED driver dengan sinyal output dari stage terakhir dari AFE receiver. Berdasarkan pengujian dapat ditunjukkan bahwa bandwidth optimum dari AFE transceiver adalah dalam rentang 50 kHz sampai 450 kHz (referensi redaman pada frekuensi cut-off = -3 dB) dan jarak maksimum transmisi data adalah 40 cm dengan sudut elevasi penerimaan sebesar 0 derajatCurrently, LED functions not only as illumination purpose but also can be used as a communication device. Commonly, this technology is called as "visible light communication (VLC)", which has begun to be applied in areas susceptible to electromagnetic waves, such as hospitals, aircraft cabins, airports, military headquarters and etc. Generally, the media, which is used as object of the data transmission, e.g. digital images, video, audio (music only), texts, and even data packets for internet browsing purposes. This research implements a VLC system that focuses on the physical layer, especially in Analog Front-End (AFE) part. The designed system consists of an AFE transmitter module as a modulator and an AFE receiver as a demodulator. The designing AFE transmitter adopts the Bias-T module principle, it has same the functionality but extremely lower in the cost factor. While in the AFE receiver part, the DC-offset remover module is implemented, it has a function to reduce the DC signal that generated from ambient light. The results of demonstration show that the system, functionally, can be used for transmitting audio signals via visible light and the received data can be displayed to the loudspeaker directly. In this work, the data observation is done by comparing the amplitude of input signal connected to the driver LED against the output signal from the last stage of the AFE receiver. From the test results, it can be shown that the optimum bandwidth of the AFE transceiver is about 50 kHz to 450 kHz (with attenuation at fc = -3 dB as a reference) and the maximum distance for data transmission is 40 cm and angle of reception is 0
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
Design of AXI4-Stream based Modulator IP Core for Visible Light Communication System-on-Chip
Full text linkIn this paper, the design of AXI4-Stream based modulator IP core for Visible Light Communication is reported. The modulator IP core conforms to the AXI4-Stream protocol standard, which is widely used in System-on-Chip (SoC) design. There are three modulation types in this IP core namely, Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK), and Quadrature Amplitude Modulation-16 (QAM-16). These modulation types are commonly used in the DCO-OFDM system. The modulation types can be selected programmatically from software that runs in the main processor by accessing the control register. The output of the modulator is designed for DCO-OFDM modulation using 64-point IFFT. According to the simulation results, this modulator IP core can achieve a throughput of 95.36 Mb/s, 184.77 Mb/s, and 347.81 Mb/s for BPSK, QPSK, and QAM-16, respectively. This modulator IP core is reusable in the DCO-OFDM system, so it increases productivity in DCO-OFDM system design.In this paper, the design of AXI4-Stream based modulator IP core for Visible Light Communication is reported. The modulator IP core conforms to the AXI4-Stream protocol standard, which is widely used in System-on-Chip (SoC) design. There are three modulation types in this IP core namely, Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK), and Quadrature Amplitude Modulation-16 (QAM-16). These modulation types are commonly used in the DCO-OFDM system. The modulation types can be selected programmatically from software that runs in the main processor by accessing the control register. The output of the modulator is designed for DCO-OFDM modulation using 64-point IFFT. According to the simulation results, this modulator IP core can achieve a throughput of 95.36 Mb/s, 184.77 Mb/s, and 347.81 Mb/s for BPSK, QPSK, and QAM-16, respectively. This modulator IP core is reusable in the DCO-OFDM system, so it increases productivity in DCO-OFDM system design
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
2011 Sixth International Symposium on Parallel Computing in Electrical Engineering, 4-5 April 2011 Luton, United Kingdom
No full textAbstract—The implementation of complex signal processing
algorithms are required to achieve robust transmission, whereas
mobile wireless application require low power dissipation. This
paper describes an algorithm and a corresponding hardware
architecture for the implementation of OFDMA 802.16e channel
estimation. The advantage of the proposed architecture are low
power and efficient resource utilization since we use iterative
memory shared architecture that exploits reutilization of the
processor elements and memory units. The higher data access
scheme is utilized by scheduled memory sharing with common
bus. Furthermore, we increase parallel efficiency by folding the
architecture to reduce the number of processor elements
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