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Articles by R.K.Z. Sahbudin
Total Records ( 4 ) for R.K.Z. Sahbudin
  R.K.Z. Sahbudin , S.A. Fauzi , S. Hitam and M. Mokhtar
  The exposure of human body to electric field and magnetic field could cause biological effects, including changes in functions of cells and tissues and subtle changes in hormone levels, which may or may not be harmful. The aim of this study was to analyze and compute the amount of electrical potential, electric field and magnetic flux density at a certain point and distance from the overhead high voltage power lines of 132 and 275 kV in Malaysia. An analytical calculus method is proposed in order to accomplish this study. The models of the power lines were constructed using the actual physical dimensions of the towers. The results show that the exposure levels of the electromagnetic fields to the public is low if they stay more than 30 m away from the power lines. For the live-line worker, the exposure to the high electric and magnetic field could endanger their body if they stay too close to the conductor. The evaluations of the electrical potential, electric field strength and magnetic flux density are done using the Matlab environment. Matlab’s Graphical User Interface (GUI) techniques are developed as an easy and user-friendly tool to be used.
  S. Hitam , K.L. Tan , R.K.Z. Sahbudin , M. Mokhtar , S.B. Ahmad Anas and A. Sali
  Research indicated that there is no proven cure for autism sufferers. Usually, implementing the appropriate treatment and education can eventually help the autism person to be integrated into their community. However, the conventional visual schedule and training system that depending on physical tool and toy bringing the difficulty on changing or update the picture, text and current using tool. Therefore, Digital Visual Schedule and Training System (DVST System) is developed as a user- friendly, interactive and flexibility system for children with autism. The inconveniency of traditional training program that depending on physical tool or multiple application software is improved by DVST system that provides a complete set of features and functions for the therapist and autistic children to carry out the administration work (for therapist-Server) as well as training program (for autistic children-Client) in a single application.
  W.J.M. Al-galbi , M. Mokhtar , A.F. Abas , S.B.A. Anas and R.K.Z. Sahbudin
  Problem statement: In this study, a distributed power control algorithm is proposed for Dynamic Frequency Hopping Optical-CDMA (DFH-OCDMA) system. Approach: In general, the DFH-OCDMA can support higher number of simultaneous users compared to other OCDMA techniques. However, the performance of such system degrades significantly as the received power does lower than its minimum threshold. Results: This may obviously occur in a DFH-OCDMA network with near-far problem which consist of different fiber lengths among the users, that resulting to unequal power attenuation. The power misdistribution among simultaneous active users at the star coupler would degrade the Bit Error Rate (BER) performance for users whose transmitting signals with longer fiber lengths. In order to solve these problems, we propose an adaptive distributed power control technique for DFH-OCDMA to satisfy the target Signal to Noise Ratio (SNR) for all users. Conclusion: Taking into account the noise effects of Multiple Access Interference (MAI), Phase Induced Intensity Noise (PIIN) and shot noise, the system can support 100% of users with power control as compared to 33% without power control when the initial transmitted power was -1dBm with 30 simultaneous users.
  Ahmed Shakir Al-Hiti , R.K.Z. Sahbudin , Fazirulhisyam Hashim and M. Zulkiflee
  Mobile Ad-hoc Network (MANET) is a significant and confirms research area. The routing protocol should distinguish and keep an exceptional route among source and target. There are several assailants that able to create problems in the network, for example, a flooding assailant that causes a sag in several packages. In this study, it creates an investigation and analysis of lateness, normalized routing loads and packet delivery fractions of MANET, 2 routing protocols using Transmission Control Protocol (TCP) and User Datagram Protocol (UDP), under normal conditions and under dropping packet cases. This comparison is important when choosing the better transfer package from the source to the target and the traffic kind in the network by routing protocol. The results show that AOMDV is better than AODV using TCP and UDP. In a normal condition, the delay of packets in AOMDV reaches its maximum at 0.1967, 0.3116 and 0.2832 with TCP and at 0.045, 0.0386 and 0.094 with UDP in the first, second and third scenarios, respectively. In dropping packets condition, the delay of packets in AOMDV reaches its maximum at 0.0162, 0.0587 and 0.0224 with TCP and at 0.0151, 0.0201 and 0.014 with UDP in the 1st-3rd scenarios, respectively.
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