1,720,954 research outputs found
Evaluasi Spesifikasi Minimal Perangkat SDR untuk Modul Pemancar pada berbagai Aplikasi RADAR CC-OFDM-MIMO
No full textStudi ini berfokus pada evaluasi spesifikasi minimal perangkat SDR (Software Defined Radio) untuk modul pemancar pada berbagai aplikasi radar CC-OFDM MIMO. Teknologi radar ini menawarkan keunggulan seperti ortogonalitas multidimensi, peningkatan resolusi jarak dan azimuth, fleksibilitas konfigurasi, serta kemampuan menghasilkan beberapa sorot ortogonal secara simultan. Namun, kompleksitas desainnya memerlukan kajian mendalam terhadap keterbatasan perangkat keras, termasuk kebutuhan DSP block, bandwidth, memori, serta faktor DAC (Digital-to-Analog Converter) dalam implementasi praktis. Pendekatan penelitian mencakup analisis sistem radar, pemecahan komponennya, serta pengembangan model matematis untuk memetakan hubungan antara parameter masukan (jumlah beam, subcarrier, simbol, bandwidth) dengan indikator performa utama (resolusi jarak, waktu pada target, dan kemampuan deteksi). Simulasi menggunakan MATLAB dilakukan untuk mengukur kebutuhan operasi dan RFLOPS pada berbagai konfigurasi aplikasi radar. Hasil simulasi menunjukkan bahwa radar pengawasan dengan 63 beam, 2048 subcarrier, dan 12 simbol membutuhkan 40.3 juta operasi, sementara radar otomotif dengan 60 beam, 128 subcarrier, dan 1 simbol hanya memerlukan 200 ribu operasi. Analisis spesifik terhadap FPGA melibatkan evaluasi kemampuan DSP block, latensi, pipeline, serta pengaruh DAC terhadap efisiensi konversi sinyal. Penelitian ini juga mencakup pengembangan formulasi kebutuhan perangkat keras berdasarkan batasan desain, seperti alokasi memori untuk kode Golay, distribusi subband, serta sinkronisasi faseuntuk mempertahankan ortogonalitas antar sinyal.Selain itu, penjadwalan transmisi dan penerimaan dirancang untuk mengurangi coupling antar elemen dan mendukung pengolahan sinyal paralel. Hasil penelitian memberikan panduan komprehensif dalam desain dan implementasi radar CC-OFDM MIMO, termasuk optimalisasi perangkat keras untuk aplikasi spesifik seperti radar pengawasan, otomotif, dan jangkauan pendek. Kontribusi penelitian ini meliputi formulasi hubungan parameter masukan dengan kinerja sistem, evaluasi spesifikasi minimal FPGA dan DAC, serta pengembangan panduan implementasi yang efisien untuk kebutuhan misi tertentu
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This study focuses on the evaluation of the minimum specifications of SDR (Software Defined Radio) devices for transmitter modules in various CC-OFDM MIMO radar applications. This radar technology offers advantages such as multidimensional orthogonality, increased range and azimuth resolution, configuration flexibility, and the ability to generate multiple orthogonal beams simultaneously. However, the complexity of its design requires an in-depth study of hardware limitations, including the need for DSP blocks, bandwidth, memory, and DAC (Digital-to-Analog Converter) factors in practical implementations. The research approach includes radar system analysis, component breakdown, and mathematical model development to map the relationship between input parameters (number of beams, subcarriers, symbols, bandwidth) with key performance indicators (range resolution, time on target, and detection capability). Simulations using MATLAB are performed to measure the operational requirements and RFLOPS in various radar application configurations. Simulation results show that a surveillance radar with 63 beams, 2048 subcarriers, and 12 symbols requires 40.3 million operations, while an automotive radar with 60 beams, 128 subcarriers, and 1 symbol only requires 200 thousand operations. Specific analysis of the FPGA involves evaluating the capabilities of the DSP block, latency, pipeline, and the effect of the DAC on signal conversion efficiency. This research also includes the development of hardware requirement formulations based on design constraints, such as memory allocation for Golay code, subband distribution, and phase synchronization to maintain orthogonality between signals. In addition, transmission and reception scheduling are designed to reduce coupling between elements and support parallel signal processing. The results of this research provide comprehensive guidance in the design and implementation of CC-OFDM MIMO radars, including hardware optimization for specific applications such as surveillance, automotive, and short-range radars. The contributions of this research include the formulation of the relationship between input parameters and system performance, evaluation of minimum specifications for FPGA and DAC, and development of efficient implementation guidelines for specific mission requirement
Analisis Kelayakan Link 6G THZ dan VLC pada Iklim Hujan Tropis di Indonesia
No full textDengan berkembangnya ilmu telekomunikasi serta meningkatnya permasalahan yang menuntut teknologi cerdas dan andal, jaringan komunikasi 6G telah mulai banyak diteliti. Link Terahertz (THz) dan Cahaya Tampak (VLC) menjadi Pita yang akan digunakan untuk jaringan ini. dimana dua Pita Frekuensi ini memiliki bandwidth yang lebar sehingga mampu mentransmisikan data lebih cepat. Penggunaan Frekuensi yang semakin tinggi menyebabkan redaman yang terjadi saat transmisi juga semakin besar terutama redaman hujan. Hal ini akan menurunkan kinerja dari link 6G yang akan diterapkan terutama pada daerah tropis seperti Indonesia sehingga perlu dilakukan analisis pengaruh redaman hujan tropis ini terhadap kelayakan jaringan 6G . Pada penelitian ini akan dilakukan simulasi AR (Autoregressive Multivariate) untuk menyimulasikan pembangkitan curah hujan dengan statistik yang telah didapatkan dari pengukuran dengan tujuan mendapatkan nilai redaman hujan dalam penelitian ini statistik curah hujan yang digunakan sebagai acuan adalah curah hujan Surabaya, simulasi juga dipadukan dengan evaluasi penggunaan Cell-Site Diversity, yang mana dalam simulasi keduanya bisa langsung diperoleh pada setiap kali program dijalankan. Berdasarkan analisis data yang didapat dari simulasi diperoleh kesimpulan bahwa dengan adanya pengaruh curah hujan tropis untuk komunikasi 6G diluar gedung dengan memperhatikan fade margin 3 dB panjang link yang memungkinkan untuk link THz adalah 2.5 meter dan 3 meter untuk link VLC, dengan pendeknya link ini penggunaan Cell-site Diversity juga tidak berpengaruh pada komunikasi 6G diluar gedung baik dengan link Terahertz maupun VLC, dengan demikian pada kondisi hujan tropis penggelaran jaringan 6G lebih direkomendasikan untuk di terapkan di dalam ruangan.
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With the development of Telecommunications science and the increasing number of problems that require intelligent and reliable technology, 6G communication networks have begun to be widely researched. Terahertz (THz) and Visible Light (VLC) links are the bands that will be used for this network. where these two Frequency Bands have a wide bandwidth so they can transmit data faster. The use of higher frequencies causes the attenuation that occurs during transmission to increase, especially rain attenuation. This will reduce the performance of the 6G link which will be applied mainly to tropical areas such as Indonesia, so it is necessary to analyze the effect of tropical rain attenuation on the feasibility of the 6G network. In this study, an AR (Multivariate Autoregressive) simulation will be carried out to simulate the generation of rainfall with statistics that have been obtained from measurements with the aim of getting the value of rain attenuation. in this study the rainfall statistics used as a reference is Surabaya rainfall, the simulation is also combined with an evaluation of the use of Cell-Site Diversity , which in the simulation both can be directly obtained each time the program run. Based on the analysis of the data obtained from the simulation, it can be concluded that with the influence of tropical rainfall for 6G communication outside the building by paying attention to the fade margin of 3 dB, the link length that allows for a THz link is 2.5 meters and 3 meters for a VLC link, in short this link uses Cell -Site Diversity also has no effect on 6G communication outside the building either with Terahertz or VLC links, thus in tropical rain conditions the deployment of a 6G network is recommended to be applied indoors
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
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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