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Articles by N.A. Rahman
Total Records ( 6 ) for N.A. Rahman
  S.A.Z. Murad , M.N.Md. Isa and N.A. Rahman
  In industrial process today, reliability of equipment is very important. Power supply must be able to cater the need of industrial process. In case of power failure, backup power supply system must be able to support the main process plant. This is to ensure smooth operation and product quality. In order to do this, uninterruptible power supply (UPS) system can be used to ensure the reliability, stability and consistency of the entire system. This UPS system must be monitored in order to enable them to react accordingly in response to a fault or power failure. In this project, monitoring system for UPS was designed by using visual basic (VB) to provide a safe and constant 12V DC supply in the case of power disruption. The main power supply, 240V AC was converted to 12V DC as output voltage and a battery will be used as part of the backup system. This system will be able to control the source of power which offers power from LIVE line or power from BATTERY line. The main output voltage was 12V DC and the battery level will be monitored using GUI software created using VB.
  Y. Norma-Rashid , N.A. Rahman and D. Li
  This study examines the diversity and distribution of spiders in the mangrove areas in Peninsular Malaysia which is hoped to contribute towards understanding the dynamics of the mangrove ecosystem. Little research has been done on local spiders and inventory from this habitat is rare. From faunal samples taken along transects from upper to lower zones of Morib mangrove forest and studies on available museum specimens in the Raffles Museum of Biodiversity Research (RMBR), yielded 26 species belonging to 10 family groups. There exist 4 species as new records for Malaysia which are Clubiona meraukensis, Dolomedes mizhoanus, Pardosa zhanjiangensis and Telamonia dimidiata. The jumpers or family Salticidae has an overall wide distribution across all zones sampled. Generally, the spider distribution depended on the zone location and floral diversity. Spider zonation pattern is probably influenced by complex factor combinations rather than one factor which include biotic relationships such as competition and predation.
  Y. Norma-Rashid , N.A. Rahman and D. Li
  Z. Zainudin , N.A. Rahman , N. Abdullah and N.F. Mazlan
  Tebrau River starts in Senai and ends in the Straits of Johor and has been categorized as most polluted river in Malaysia. It has been classified as class III river water quality based on the Interim National Water Quality Standard (INWQS) with the average value of Water Quality Index (WQI) of 59. This study was focussed on simulating the effect of the pollution from industrial area to Tebrau River Basin by using QUAL2K which is the modenization version of QUAL2E. This water quality model involved in simulates two primary parameters which are Biochemical Oxygen Demand (BOD) and Ammoniacal Nitrogen (AN). It has been found out that QUAL2K model can be used as an outstanding tool in managing the river basin.
  N.A. Rahman , N.A. Rashid , W.N. Mahadi and Z. Rasol
  This study investigated the magnetic field survey of two electric power substations with power capacity of 1500 kVA, 11/0.4 kV which resided in a typical high rise office building in Kuala Lumpur, Malaysia. The purpose of a survey is to examine the exposure levels of magnetic radiation from its electric substation. The method used in this study includes comparative analysis of measured data using EMDEX meter and interfaces with EMCALC software for linear data acquisition. Results of two substations, which located in the basement floor and 15th floors were obtained throughout normal working hours. The measurements were arranged by applying two separate protocol conditions which is near and far fields. The specifications of measuring instruments used in this assessment were also displayed. Final conclusions were made based on the reduction rate calculation as an indicator values to determine the safety levels and comparison to the international standard guidelines.
  N.Z.M. Saat , N.A. Rahman and A.A. Jemain
  The prevalence of sleep apnea problem have rise since twenty years ago. Sleep apnea disrupts the quality of sleep and may influence quality of life. The purpose of this study was to find relationship between occurrence of apnea and occurrence of rapid eye movement (REm) sleep stages. The empirical Bayes method was used to estimates the rates of apnea and rates of REm among 13 patients that were suffering of sleep apnea problem. The data was extracted from PhysioBank website that consists of apnea events and sleep stages. In this study, The parameter estimates of Poisson-gamma model was considered. The estimation of parameter was done using three method which is moment (mom), maximum likelihood (mLE) and alternate method (mLM). The results indicated that the estimates of parameter was almost similar between three methods. The estimates of rates of apnea was not related to rates of REm. The rates of apnea and rates of REm was differed between the 1st and 2nd half period of sleep. Furthermore, there was no relationship between apnea and sleep stages of REm when the time of sleep was partition into 1st and 2nd period of sleep. Based on the bootstrapping method the estimates of parameter was found to be acceptable for a particular patients.
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