Papers by Abubaker Abushofa
Procedings of the British Machine Vision Conference 1995, 1995
Arabic characters differ significantly from other characters such as Latin and Chinese characters... more Arabic characters differ significantly from other characters such as Latin and Chinese characters in that they are written cursively in both printed and handwritten forms and consist of 28 main characters. However most of their shapes change according to their position in the word. These shapes together with some other secondaries raise the number of classes to 120. Furthermore, some of these characters have the same shape but are distinguished by the presence of one, two or three dots above or below them. In this paper words are first segmented into characters and secondaries are removed using novel algorithms. This reduced the classes to 32 out of 120 different classes. Information about these secondaries such as their number, position and type are recorded and used in the final recognition stage. Features of the skeletonised character are used for classification using a decision tree. A recognition rate of 97.23% is achieved.
This article is based on the technique which is called Discrete Parameter Tracking (DPT). First i... more This article is based on the technique which is called Discrete Parameter Tracking (DPT). First introduced by A. A. Azab [8] which is applicable for less order reference model. The order of the reference model is (n-l) and n is the number of the adjustable parameters in the physical plant. The technique utilizes a modified gradient method [9] where the knowledge of the exact order of the nonadaptive system is not required, so, as to eliminate the identification problem. The applicability of the mentioned technique (DPT) was examined through the solution of several problems. This article introduces the solution of a third order system with three adjustable parameters, controlled according to second order reference model. The adjustable parameters have great initial error which represent condition. Computer simulations for the solution and analysis are provided to demonstrate the simplicity and feasibility of the technique.
Measurement of GPRS Performance over Libyan GSM Networks: Experimental Results
International journal of scientific research in science, engineering and technology, 2015
The General Packet Radio Service (GPRS) is a new bearer service for GSM that greatly simplifies w... more The General Packet Radio Service (GPRS) is a new bearer service for GSM that greatly simplifies wireless access to packet data networks, such as the Internet, corporate LANs or to mobile portals. The aim of this work is the measurement of the quality of service (QoS) parameters of GPRS over the Libyan GSM networks, Libyana mobile phone and Al-Madar Al-Jadeed Company. The measured parameters of GPRS are the throughput, round trip-time, delay time, packet loss, packet duplicate, upload speed, and download speed. To evaluate these Parameters, End-toEnd measurements are used. At one end is the client (mobile) and at the other end is the measurement server. This server is located with interne address. A special analysis algorithm was implemented.net and used for analysis the measured data. Finally, the measured values of quality of surface parameters of GPRS over the two Libyan mobile operators are illustrated and compared with the theoretical values that could be calculated beforehand.
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Papers by Abubaker Abushofa