<span>This paper presents the method of proportional resonant current controller strategy in inverter system application. In this study, the mathematical modelling of the controller is shown in detail. This is important for the modelling in Matlab Simulink. Nowadays, t</span><span lang="IN">he </span><span lang="EN-MY">decrement</span><span lang="IN"> of power quality is easily found in this inverter system where </span><span lang="EN-MY">inverter</span><span lang="IN"> extensively used as interface circuits</span><span lang="EN-MY">. To solve this problem, proportional resonant current controller is the solution. </span><span>At resonant frequency, this</span><span lang="IN"> controller has infinite gain which ensures</span><span lang="EN-MY"> a</span><span lang="IN"> zero steady-state error in a stationary frame</span><span lang="EN-MY">. This will result</span><span lang="IN"> in minimized load current distortion as well as the harmonic content</span><span lang="EN-MY">s. At the end, simulation result shows when using PR current controller, the unwanted harmonics injection are much reduced</span><span>.</span>

Buses are one of the important public transportation in Malaysia and commonly important for the student in any university. Thus, the study about Whole-Body Vibration (WBV) exposure induces to Low Back Pain (LBP) among the Universiti Tun Hussein Onn Malaysia (UTHM) was done. The objective was determine whether the bus drivers in UTHM would exceed the exposure action and limit values from the ISO 2631-1 (1997) during the working hours. Data collected according to different type of buses and evaluated the vibration significant different between buses based on the subjective correlation due to WBV questionnaire analysis. Analyze the prevalence of LBP based on the measurement and the questionnaire analysis. The study based on the international standard ISO 2631-1 (1997) which is related to the root-men-square (r.m.s) and Vibration Dose Value (VDV) parameter. The study covered among the bus drivers in UTHM. The measurement tools involved in the study is Larson Davis Vibration Meter (HVM 100) with Triaxial Seat Pad Accelerometer to record data collection. The BLAZE software analyze the vibration exposure exceed the total vibration exposure according to 8 hours day A(8) value of 1.15 m/s 2 and VDV value of 21.0 m/s 1.75 . The IBM Statistical Package for Social Science (SPSS) was used to do statistical analysis and testing involved was correlation, regression and ANOVA. Result obtained shows the A(8) and VDV was under EAV with highest value of 0.520 m/s 2 and12.65 m/s 1.75 . The highest contribution factors by the duration to complete single trip per day expose to WBV. The further re-assess of working schedule need to be done in order to control the exposure level toward drivers. The assessment should be done for every two years.

<span>This paper presents a wireless operation to switch on and off the load such as light, fan and power socket by sending messages via smartphone. The proposed project is focused on usage of the global system for mobile communication (GSM) protocol, which enables the user to control loads away from targeted area using the frequency bandwidths. The concept of serial communication and Uno microcontroller-commands are being applied towards development of the GSM based domestic electrical load control using Arduino UNO system. Besides that, the existing electrical switches that control the load manually is not being removed and this gives a safer control over the switches with low voltage usage technique. This system is designed to control electrical devices throughout the house with easy installation process, ease of use and cost effective design and implementation. Additionally, the system has several possibility to help satisfy the needs of the elderly and the handicapped at houses. Prototype of GSM based domestic electrical load control using Arduino UNO was implemented and successfully tested with maximum of five loads such as light, fan and power sockets.</span>