299 research outputs found
Buku Sadur : Linux System Admin Guide (Panduan Administrator Sistem Linux)
No full textPanduan Administrator Sistem Linux, menjelaskan aspek administrasi sistem dalam menggunakan Linux. Ini ditujukan untuk orang-orang yang hampir tidak tahu apa-apa tentang administrasi sistem (mereka yang mengatakan ``apa itu?''), tetapi yang telah menguasai setidaknya dasar-dasar penggunaan normal. Manual ini tidak memberi tahu Anda cara menginstal Linux; yang dijelaskan dalam dokumen Instalasi dan Persiapan. Lihat di bawah untuk informasi lebih lanjut tentang manual Linux.
Administrasi sistem mencakup semua hal yang harus Anda lakukan untuk menjaga agar sistem komputer tetap dapat digunakan. Ini mencakup hal-hal seperti mencadangkan file (dan memulihkannya jika perlu), menginstal program baru, membuat akun untuk pengguna (dan menghapusnya saat tidak lagi diperlukan), memastikan bahwa sistem file tidak rusak, dan seterusnya. Jika komputer adalah, katakanlah, sebuah rumah, administrasi sistem akan disebut pemeliharaan, dan akan mencakup pembersihan, perbaikan jendela yang pecah, dan hal-hal lain semacam itu
Dasar - Dasar Linux
No full textLinux adalah sebuah sistem operasi seperti Unix yang menggunakan kernel linux sebagai inti dan disertakan aplikasi dan module pendukung lain agar berfungsi dan bisa digunakan secara utuh layaknya sistem operasi pada umumnya.
Sistem operasi ini bersifat bebas digunakan dan opensource sehingga bisa dipakai dan dikembangkan oleh semua pihak secara gratis
ADMINISTRASI SERVER BERBASIS LINUX #1
No full textPada Awalnya linux adalah nama kernel atau jantung system operasi computer yang dibuat pertama kali oleh Linus Torvalds pada 1991. Linus mengizinkan siapa saja menggunakan, mempelajari cara kerjanya, dan mendistribusikan Linux, dengan lisensi GNU GPL (General Public License) atau lebih terkenal dengan istilah Free Software.
Saat ini, nama Linux tidak hanya digunakan untuk menyebut kernel, namun juga system operasi yang lengkap. Bahkan Linux juga digunakan untuk menyebut distribusi (gabungan system operasi dan berbagai aplikasi) atau distro Linux. Contoh distro Linux: BlankOn, CentOS, Debian, Fedora, Gentoo, Mandriva, Mint, Nusantara, openSUSE, RedHat, Slackware, Ubuntu, Xandros, dan lain-lain
Pengelolaan Repository Artikel Ilmiah Dosen menggunakan Aplikasi Eprints tahun 2020
No full textEprints adalah perangkat lunak berbasis web
untuk mendukung proses pengelolaan materi
repositori institusi. Fitur yang dihadirkan dapat
dikatakan mendukung kebutuhan dan terus aktif dikembangkan. Eprints juga dapat digunakan oleh
berbagai jenis perpustakaan, dari perpustakaan
sekolah, perpustakaan perguruan tinggi dan
perpustakaan khusus. Menjalankan perangkat lunak
eprints bisa menggunakan jaringan secara lokal atau
internet. Secara persentase pengembangan, eprints
dikembangkan dengan bahasa pemrograman perl dan
databasenya menggunakan MySQL. Diambil dari
situs resminya eprints juga ditujukan tidak hanya bagi
pengelola repositori saja namun juga bagi beberapa
pengguna lainnya seperti researcher, developer,
webmaster dan institution (Eprints software 2017,
hlm. 1)
ADMINISTRASI SERVER BERBASIS LINUX #2
No full textLinux atau GNU/Linux adalah sistem operasi bebas yang sangat populer
untuk computer, Istilah Linux atau GNU/Linux (GNU) juga digunakan sebagai
rujukan kepada keseluruhan distro Linux (Linux distribution), yang di
dalamnya disertakan program-program lainpendukung sistem operasi. Contoh
program tersebut adalah server web, bahasa pemrograman, basisdata, tampilan
desktop (Desktop Environment) (seperti GNOME dan KDE), dan aplikasi
perkantoran (office suite) seperti OpenOffice.org, KOffice, Abiword,
Gnumeric.Distro Linux telah mengalami pertumbuhan yang pesat dari segi
popularitas, sehingga lebih populer dari versi UNIX yang menggunakan sistem
lisensi dan berbayar (proprietary) maupun versi UNIX bebas lain yang pada
awalnya menandingi dominasi Microsoft Windows dalam beberapa sisi. Linux
mendukung banyak perangkat keras komputer, dan telah digunakan di berbagai
peralatan dari komputer pribadi, superkomputer dan sistem benam (embedded
system), seperti telepon seluler (Ponsel) dan perekam video pribad
On the spatial and temporal coherence of wireless vehicular short range channels
No full textWe consider spatial and temporal coherence of the vehicle–to–vehicle (V2V) wireless communication channel with focus on a suburban residential highway. The dominant reflectors in such an environment are vehicles passing in the adjacent lane and houses
along the road. Instead of treating the reflectors as point targets, the V2V short range propagation environment requires partitioning of the illuminated reflector side into
sufficiently small tiles. The channel transfer function is obtained as a superposition of specular reflections from the tiles, the line–of–sight (LOS) component, and the ground reflection. The tile size is selected to ensure that the ratio of the tile area to the tile–to–receiver distance satisfies the far field conditions. The reflected power is described by the tile radar cross section (RCS). The bistatic physical optics RCS model is adapted to account for the tile’s orientation with respect to the ray geometry. We apply the superposition model to the numerical analysis of two general scenarios
for a 22MHz channel in the 2.4GHz band. The first scenario considers a single vehicle reflector passing in the lane adjacent to the V2V communication pair. Both the vector network analyzer (VNA) experiments and the tiling model analysis illustrate that repositioning of the reflector, the transmitter, or the receiver by a few centimeters results in change of the signal power by several decibels. The second scenario analysis characterizes the channel coherence statistics for the
suburban residential highway. We consider the V2V single lane LOS and non–LOS geometries, where in the latter the receiver is shadowed by a large vehicle. The reflectors are both houses and vehicles passing in the opposite direction. The measure of channel coherence is the normalized spatial covariance calculated by correlating transfer functions corresponding to feasible receiver position pairs and performing spatial smoothing. The area of feasible receiver positions is divided into contiguous squares
whose size ensures wide sense quasi–stationarity within the square. Irrespective of direction the correlation remains high and a typical sedan roof usually does not provide sufficient spacing to obtain average inter–antenna correlation lower than 0.5. The upper bound on coherence time extends over the transmission time of multiple packets for systems in the considered band, and does not allow for usable time diversity.Ph.D.Includes bibliographical referencesIncludes vitaby Haris Krem
Explosive indentation study of B4C-TiAlx composites fabricated by the dipping exothermic reaction process
No full textThe aim of this study is to fabricate a high volume fraction B4C-reinforced intermetallic matrix composite by the dipping exothermic reaction process and investigate the shock impact damage response of composites by explosive indentation experiment. It has been shown that the final microstructure of the dipping exothermic reaction process-fabricated composite can be tailored by treatment of the constituent powders and post heat treatment. The hardness and impact damage resistance of the fabricated composites were evaluated.This work is supported by grants (No. N62649-03-0007) from AROFE(US Army
Research Office Far-East). The author thanks Drs. J. W. McCauley of ARL, Sean Yu and
R. Olesinskiof AROFE
Increasing the Performance of Passive Communication with Ambient Light
No full textMost wireless communication technologies have been using the Radio Frequency (RF) spectrum for decades. Due to the popularity of the Internet of Things (IoT), the RF spectrum has started to become densely populated. Researchers have begun to explore other bands of the electromagnetic spectrum that can be utilized as a communication media. One of the promising choices is the visible light spectrum.Visible Light Communication (VLC) refers to the wireless communication technology that utilizes the visible light spectrum. This spectrum is thousands of times wider than the Radio Frequency (RF) spectrum and is license-free. In VLC, data is transmitted by turning a light source on and off. However, not every light source can be controlled. Passive light sources such as the sun provide an immense amount of light that can be used for wireless communication if we can develop ways to modulate them. One of the researches that use ambient light to create a wireless link is LuxLink. LuxLink uses liquid crystal shutters to control passive light sources and provides low energy, reliable, and flicker-free (safe) communication. This thesis addresses several problems that the current LuxLink system has.We present LuxLink+, an extension of LuxLink that provides two main improvements. Firstly, the data rate of the system is relatively low (80~bps). To increase the data rate, we provide a thorough analysis of the system’s bandwidth. Afterward, we modify the modulation technique, which increases the data rate to 1000~bps at a range of 1.5~m.Secondly, the system has a static data rate, which means that the system cannot adapt its data rate to changes in the environment. We implement a rate adaptation algorithm that can change its data rate accordingly. LuxLink+ improves the average throughput of the system by up to 85 percent compared to LuxLink.Electrical Engineering | Embedded System
Performance investigation of an integrated wind energy system for co-generation of power and hydrogen
No full textIn this paper, a wind turbine energy system is integrated with a hydrogen fuel cell and proton exchange membrane electrolyzer to provide electricity and heat to a community of households. Different cases for varying wind speeds are taken into consideration. Wind turbines meet the electricity demand when there is sufficient wind speed available. During high wind speeds, the excess electricity generated is supplied to the electrolyzer to produce hydrogen which is stored in a storage tank. It is later utilized in the fuel cell to provide electricity during periods of low wind speeds to overcome the shortage of electricity supply. The fuel cell operates during high demand conditions and provides electricity and heat for the residential application. The overall efficiency of the system is calculated at different wind speeds. The overall energy and exergy efficiencies at a wind speed 5 m/s are then found to be 20.2% and 21.2% respectively
Multigeneration system exergy analysis and thermal management of an industrial glassmaking process linked with a Cu–Cl cycle for hydrogen production
No full textA multigeneration system for hydrogen production linked with a glassmaking process via thermal management is examined in this study. The exhaust gas is interconnected with a Rankine cycle and the copper-chlorine (Cu–Cl) cycle for hydrogen production. The present system consists of a steam Rankine cycle, Cu–Cl cycle with multistage compression, double-stage organic Rankine cycle, and multi-effect desalination system. A Cu–Cl cycle based on the four-step model is employed with the proposed system. The useful system outputs are electricity, hydrogen, and fresh water. The simulation software packages utilized in the analysis and modeling are Engineering Equation Solver and Aspen Plus. The energy efficiency of the overall system is 36.5% while 38.1% is the exergy efficiency. The parametric studies are conducted to investigate the system performance. In addition, the effects of exhaust gas variables, such as flow rate, temperature, and pressure are examined to investigate the system performance
- …
