Abstract. In many cases, it is impractical to measure the vibrations directly at or close to their source. It is a common practice to measure the vibration at a location far from the source for condition monitoring purposes. The vibration measured in this way inevitably has high distortions from the vibrations due to the effect of the attenuation of signal paths and the interference from other sources. The suppression of the distortions is a key issue for the remote measurements based condition monitoring. In this paper, the influences of transducer locations are investigated on a typical gearbox transmission system for the detection of the faults induced to the gearbox. Several signal processing techniques’ analysis results show that the attenuation and interference cause high influences on the gear transmission signals. However, time synchronous average (TSA) is very effective to detect the local faults induced to the gear system.

We present a model of web-based learning for teaching Visual Programming in Delphi, by adopting individual learning styles. A software system was developed for this purpose where two learning models (namely; 4MAT system and PBL system) are implemented. The goal of this research is to examine the influence of the two selected models on students of different learning styles enrolled in a web-based programming course.

Students were randomly divided into two groups, one for each learning model, and are given access to a website designed specifically for this purpose. Pre and post-tests were carried out.

A controlled evaluation is currently underway to assess the impacts of the system on students programming skills as well as their attitudes surrounding the use of available web facilities.

“A Comparative Study of

Architecture Description language (ADLs)&;,

This paper predicts the effect of the user’s hand-hold position on the Total Isotropic Sensitivity (TIS) of GSM900/1800 mobile phone antennas of realistic in-use conditions, where different semi-realistic mobile phone models, i.e., candy bar and clamshell, as well as different antenna types, i.e., external and internal, are simulated using a FDTD-based platform. A semi-realistic hand model consisting of three tissues and the SAM head are used in simulations. The results show a considerable impact on TIS of the adopted mobile phone models owing to the user’s hand presence at different positions, where a maximum level of TIS is obtained while grasping the upper part of the mobile phone against head. Maximum TIS levels are recorded in talk position for mobile phones with external antenna and maximum differences in TIS levels due to the hand-hold alteration are recorded for clamshell-type phones.

Using Verilog Hardware Description Language to teach Computer Architecture Courses

This paper describes the design and fabrication of an intelligent gate system that allows only certain vehicles or cars passing through the gate. It is very important to design an intelligent gate to control the flow of entered people or vehicles to the premises. The gate system should have capabilities to control the gate, where only specified vehicles or cars are allowed to enter the premises. The gate will open when the known vehicles are identified. The gate will not open if unauthorized vehicles try to pass. The system is a combination of mechanical, electrical and electronic components. It is one of the mechatronics engineering products. This intelligent gate system is suitable to be installed at universities, companies where only certain vehicles are allowed to enter. The list of certain vehicles must be stored in the database of the system. When the unknown vehicles try to pass through the gate, the gate will show a warning signal to the driver that they are unauthorized.

This paper investigates both the computation accuracy (based on the power balance error) and the cost in terms of the number of FDTD-grid cells due to the artifact rotation for a cellular handset close to the user’s head. Two study cases are simulated to assess the EM coupling of a cellular handset and a MRI-based human head model at 900 MHz; firstly, both handset and head CAD models are aligned to the FDTD-grid, secondly, handset close to a rotated head in compliance with IEEE-1528 standard. A FDTD-based platform, SEMCAD-X, is used; where conventional and interactive gridder approaches are implemented to achieve the simulations. The results show that owing to the artifact rotation, the computation error may increase up to 30%, whereas, the required number of grid cells may increase up to 25%

As software systems grow, their complexity augments dramatically. In consequence their understandability and evolvability are becoming a difficult task, therefore a way to describe the architecture of software systems is becoming a must. The architecture of a software system can be described using either an architecture description language (ADL) or an object-oriented modeling language. In this article, we show how we can build a hybrid model, based on the two approaches, to describe the architecture of software systems. This approach profits from the advantages of the two approaches, i.e. the explicit presentation of functional aspects in object-oriented modeling and the explicit separation of competition (components) from interactions (connectors) in architectural description.