432 research outputs found
Performance evaluation of an improved admission control for differentiated MPLS-TE tunnels
No full textPerformance Analysis of On-Demand Routing Protocols in Wireless Mesh Networks
Get PDFWireless Mesh Networks (WMNs) have recently gained a lot of popularity due to their rapid deployment and instant communication capabilities. WMNs are dynamically self-organizing, self-configuring and self-healing with the nodes in the network automatically establishing an adiej hoc network and preserving the mesh connectivity. Designing a routing protocol for WMNs requires several aspects to consider, such as wireless networks, fixed applications, mobile applications, scalability, better performance metrics, efficient routing within infrastructure, load balancing, throughput enhancement, interference, robustness etc. To support communication, various routing protocols are designed for various networks (e.g. ad hoc, sensor, wired etc.). However, all these protocols are not suitable for WMNs, because of the architectural differences among the networks. In this paper, a detailed simulation based performance study and analysis is performed on the reactive routing protocols to verify the suitability of these protocols over such kind of networks. Ad Hoc On-Demand Distance Vector (AODV), Dynamic Source Routing (DSR) and Dynamic MANET On-demand (DYMO) routing protocol are considered as the representative of reactive routing protocols. The performance differentials are investigated using varying traffic load and number of source. Based on the simulation results, how the performance of each protocol can be improved is also recommended.Wireless Mesh Networks (WMNs), IEEE 802.11s, AODV, DSR, DYMO
Laina Farhat-Holzman: Distinguished ISCSC Author, Incisive Thinker, Fearless Commentator, Innovative Leader
Get PDFIt is a sad duty to report that a luminary who was long associated with this journal and with the leadership of the International Society for the Comparative Study of Civilizations, Dr. Laina Farhat-Holzman, has died
Wrist flamethrower / Muhammad Farhat Aminin Mohd Ferdaus
Get PDFThis project is to present the creation of a wrist worn flamethrower. Using a modified lighter turning it into a gas cartridge and a using the concept of fluid mechanics, the gas cartridge can produce a spray of butane gas suitable for combustion. With an ignition point at the front, a small flame can be produced and shot out of the device. This project discusses about the wrist flamethrower and results that were obtained from the project made. In conclusion based on the prototype, the author discussed the advantages and points need to be considered when working on the prototype
Learning algorithm effect on multilayer feed forward artificial neural network performance in image coding
No full textNetworks is the learning algorithm. The performance of Multilayer Feed Forward Artificial Neural Network performance in image compression using different learning algorithms is examined in this paper. Based on Gradient Descent, Conjugate Gradient, Quasi-Newton techniques three different error back propagation algorithms have been developed for use in training two types of neural networks, a single hidden layer network and three hidden layers network. The essence of this study is to investigate the most efficient and effective training methods for use in image compression and its subsequent applications. The obtained results show that the Quasi-Newton based algorithm has better performance as compared to the other two algorithms
Influence of the tip gap size on the development of the tip-leakage vortex using Large Eddy Simulations
No full textIn hydraulic turbines, the tip-leakage vortex is responsible for flow instabilities and for promoting erosion due to cavitation. To better understand the flow in the tip region, LES computations are carried out to compute the flow around a NACA0009 blade including the gap between the tip and the wall. The influence of the gap size is investigated by computing two gap widths. The validation of the results is performed by comparisons with experimental data. The simulations are also used to investigate the flow in the tip gap region. Depending on the gap width, the vortex flow topology differs from one case to the other. At large gap widths, the tip-leakage vortex merges with the tip-separation vortex. On the contrary, at small gap widths, the tip-leakage vortex move upward and no tip-separation vortex is clearly identified. Part of these observations are validated by comparisons with experimental visualizations of the cavitating tip-leakage vortex
Application of Digital Cellular Radio for Mobile Location Estimation
Get PDFThe capability to locate the position of mobiles is a prerequisite to implement a wide range of evolving ITS services. Radiolocation has the potential to serve a wide geographical area. This paper reports an investigation regarding the feasibility of utilizing cellular radio for the purpose of mobile location estimation. Basic strategies to be utilized for location estimation are elaborated. Two possible approaches for cellular based location estimation are investigated with the help of computer simulation. Their effectiveness and relative merits and demerits are identified. An algorithm specifically adapted for cellular environment is reported with specific features where mobiles, irrespective of their numbers, can locate their position without adversely loading the cellular system.
Key Words: ITS, GSM, Cellular Radio, DRGS, GPS
The Pursuit of The Arabic Language Issues, by Germanos Farhat: Editions and Translation
No full textGermanos Farhat (1670-1732) foi um bispo maronita em Alepo e importante estudioso da língua árabe. Dedicou-se ao estudo do árabe e produção de obras literárias, catequéticas e linguísticas na língua, a fim de estimular seu pleno domínio pelos maronitas, que até então usavam o siríaco como língua litúrgica. Uma de suas obras mais importantes, escrita em 1705, foi \"Em busca de questões da língua árabe\", que circulou amplamente nas escolas otomanas até o início do século XX, com diversas edições. Germanos se propôs a produzir um material de estudo gramatical para os cristãos ao mesmo tempo substancial e de fácil compreensão, de modo que pudessem dominar facilmente o árabe. Foi tão bem-sucedido em seu objetivo que \"Em busca de questões da língua árabe\" chegou a ser utilizado por importantes nomes do Renascimento Árabe (Nahḍa), como Buṭrus al- Bustāni, Sacīd aš-Šartūnī e Nāṣīf al-Yāzijī. A obra é organizada em três livros: \"Livro primeiro: flexão dos verbos\", \"Livro segundo: flexão dos nomes\", e \"Livro terceiro: sintaxe\", utilizando como corpus a própria Bíblia. O autor divide cada livro em seções, que são divididas em pesquisas e estas, por sua vez, em questões, em que Germanos discutirá os principais aspectos desses três assuntos. Esperando bem apresentar a obra, este trabalho tem o objetivo de: (a) comparar as edições de Sacīd aš-Šartūnī (1882), Buṭrus al-Bustānī (1854) e Tobia Mtīnī (1857); e (b) fazer uma tradução comentada da \"Introdução pelo Autor\" e da seção \"Das Frases\", do terceiro livroGermanos Farhat (1670-1732) was a Maronite bishop in Aleppo and an important scholar of the Arabic language. He engaged in Arabic language studies and writing literary, catechetical, and linguistic works in that language to encourage its mastery by the Maronites, who until then had used Syriac as a liturgical language. One of his most relevant works, which was written in 1705, was \"The Pursuit of the Arabic Language Issues\", widely circulated in Ottoman schools until the beginning of the 20th century, with several editions. Germanos intended to write a grammar study material for Christians that was both substantial and easy to understand, so they could easily master Arabic. He was so successful in his purpose that \"The Pursuit of the Arabic Language Issues\" was used by important names of the Arab Renaissance (Nahḍa), such as Buṭrus al- Bustāni, Sacīd aš-Šartūnī and Nāṣīf al-Yāzijī. The work is organized into three books: \"Book First: Inflection of Verbs\", \"Book Second: Inflection of Nouns\", and \"Book Third: Syntax\", using examples from the Bible as corpus. The author divides each book into sections, which are divided into pursuits and then into questions, in which Germanos will discuss the main aspects of these three subjects. Attempting to well present Farhat\'s work, this paper aims to: (a) compare the editions of Sacīd aš-Šartūnī (1882), Buṭrus al-Bustānī (1854) and Tobia Mtīnī (1857); and (b) make a commented translation of the \"Introduction by the Author\" and the section \"On Phrases\", of the third boo
Soil Nutrient Availability, Plant Nutrient Uptake, and Wild Blueberry (Vaccinium angustifolium Ait.) Yield in Response to N-Viro Biosolids and Irrigation Applications
No full textWe compared the impact of surface broadcasted N-Viro biosolids and inorganic fertilizer (16.5% Ammonium sulphate, 34.5% Diammonium phosphate, 4.5% Potash, and 44.5% s and/or clay filler) applications on soil properties and nutrients, leaf nutrient concentration, and the fruit yield of lowbush blueberry under irrigated and nonirrigated conditions during 2008-2009 at Debert, NS, Canada. Application rates of N-Viro biosolids were more than double of inorganic fertilizer applied at a recommended N rate of 32 kg ha−1. The experimental treatments NI: N-Viro with irrigation, FI: inorganic fertilizer with irrigation, N: N-Viro without irrigation, and F: inorganic fertilizer without irrigation (control) were replicated four times under a randomized complete block design. The NI treatment had the highest OM (6.68%) followed by FI (6.32%), N (6.18%), and F (4.43%) treatments during the year 2008. Similar trends were observed during 2009 with the highest soil OM values (5.50%) for NI treatment. Supplemental irrigation resulted in a 21% increase in the ripe fruit yield. Nonsignificant effect of fertilizer treatments on most of the nutrient concentrations in soil and plant leaves, and on ripe fruits yield reflects that the performance of N-Viro was comparable with that of the inorganic fertilizer used in this study
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