Skip Navigation LinksVolume : Volume 14 No.1 2005

  
  
  
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total_design_and_fabrication_of_a_cost_effective_portable_decontamination_shower.pdfTOTAL DESIGN AND FABRICATION OF A COST EFFECTIVE PORTABLE DECONTAMINATION SHOWER
  
ABSTRACT :
Design and fabrication of a cost effective decontamination shower is presented in this paper. The design method follows total design route where   market investigation, product design specification, conceptual design, detail design and fabrication of a decontamination shower were carried out. Four   concepts of decontamination shower were developed and the best concept was   selected using Pugh evaluation matrix method. The selected concept resembles a C channel. It consists of three units of galvanized iron pipes with 1 m length to   form the body and six units of 30 mm diameter galvanized iron pipes with 0.5 m  length to form the top of the decontamination shower. As an end product, a desirable decontamination shower has been fabricated. The decontamination shower was simple, portable and cheaper compared to the existing unit and   requires only 5.00 bars to operate and produce the pressure needed to decontaminate a person.       

KEYWORDS : Decontamination shower, total design, emergency response,   conceptual design, detail design.       

Author: S.M. Sapuan, K.H. Cheng, S.H. Tang and F. Abas
Year: 2005
synthesis_of_8-bit_smart_card_microprocessor_using_harvard_architecture_and_risc.pdfSYNTHESIS OF 8-BIT SMART CARD MICROPROCESSOR USING HARVARD ARCHITECTURE AND RISC
  
ABSTRACT :
There has been rapid growth of demand in usage of smart card in the world recently. The most important component of smart card is its   microprocessor. Smart card microprocessor is responsible in managing the data such as loading or storing information inside the memory of the smart card. With the addition of a encryptor/decryptor, smart card microprocessor can also provide   a security feature which is of most concern in the technology relating to the smart card. The synthesis and development of an 8-bit smart card microprocessor   uses the Harvard architecture and reduced instruction set computer (RISC)  instruction set.       

KEYWORDS : Smart card, RISC, VHDL, Harvard architecture       

Author: Mohd. Liakot Ali, Mohd Khair Hassan, Wan Zuha Wan Hasan and Tan Var Loo
Year: 2005
low_power_consumption_thermooptic_switch_using_polymers.pdfLOW POWER CONSUMPTION THERMOOPTIC SWITCH USING POLYMERS
  
ABSTRACT :
We demonstrate a waveguide based thermooptic optical switch with low electric power consumption using polymer materials. The buried square   core waveguides structure to form a directional coupler has been adopted for   single mode operation at 1550 nm wavelength. The index contrast of the upper   cladding and the waveguiding layers is 0.03. The index contrast of the lateral   section of the waveguiding and lower cladding layers is 0.005. The asymmetrical   fabricated switch exhibits very low switching power of 12.26 mW. The crosstalk   level of 30 dB for the cross state and the bar state had been achieved.       

KEYWORDS : Thermooptic optical switch, buried square core waveguide, directional coupler, switching power, crosstalk, thermooptic polymer material.       

Author: Abu Sahmah Mohd Supa'at, Abu Bakar Mohammad and Norazan Mohd Kassim
Year: 2005
development_of_a_low_power_high_quality_pulse_width_modulated_audio_amplifier.pdfDEVELOPMENT OF A LOW POWER HIGH QUALITY PULSE WIDTH MODULATED AUDIO AMPLIFIER
  
ABSTRACT :
Audio amplifiers are used widely in both entertainment and   telecommunication industries to reproduce the required quality sound with amplification. The most common audio amplifiers available in the market  can be categorised as class A, class B and class AB. Each class of the  audio amplifier has its own weakness. For example, class A audio amplifier has poor efficiency, while both classes B and AB suffer from a crossover   distortion problem. If the efficiency of the audio amplifier is poor, the amount of heat dissipated by the amplifier is large. As a result many heat sinks or  auxiliary fans have to be used to solve this problem, which adds more   cost to its production and increases its physical size. This paper presents the design and implementation of a low power high quality pulse-width-modulated (PWM) power MOSFET-based audio  amplifier, which is able to improve both its efficiency and audio quality. A natural sampled PWM switching strategy is utilised in the development of   the amplifier to reduce its harmonic level and increase its efficiency. The design is divided into a rectifier module, a PWM modulator, a pulse-cutting   circuit, a gate drive circuit, a power circuit module and an output module. The experimental results are presented and discussed. The experimental   results show that the efficiency of the amplifier can be increased to more   than 90% and the amount of heat dissipated from the amplifier is greatly reduced to more than 95%, which eliminates the use of heat sinks in the proposed amplifier.       

KEYWORDS : Audio amplifier, pulse width modulation, entertainment,         telecommunication.     

Author: Ishak bin Aris and L. N. Hulley
Year: 2005
composite_product_development_case_study_in_automotive_bumper_fascia.pdfCOMPOSITE PRODUCT DEVELOPMENT: CASE STUDY IN AUTOMOTIVE BUMPER FASCIA
  
ABSTRACT :
In this paper a study of total design of polymeric-based   composite automotive bumper fascia is presented. The total design    method consists of the following activities: market investigation, product design specifications, details and conceptual design. Each activity was   performed successfully in this study. During the detail design stage, a   material selection system was developed to come up with the best material   for the component.       

KEYWORDS : Total design, composite bumper fascia, conceptual design.          

Author: S.M. Sapuan, M.N. Suddin, N. lsmail and M.A. Maleque
Year: 2005
analysis_of_multiple_bit_errors_on_line_correcting_circuit_for_atm_network.pdfANALYSIS OF MULTIPLE BIT ERRORS ON-LINE CORRECTING CIRCUIT FOR ATM NETWORK
  
ABSTRACT :
This paper proposes a simple but orthodox technique that could enable on-line detection and correction on multiple bit errors, thus reducing the need to   retransmit any lost ATM data or information sent by sender (service provider) to receivers (customers). Currently, numerous error correction techniques have been proposed and   one of them is forward error correction, which could be implemented for linear block codes (Reed-Solomon codecs) and convolutional codes (Viterbi codecs). In the proposed   technique, the incoming ATM signals are being constantly compared with its respective   reference signals. Our results are compared with other new techniques recently proposed   or developed by other researchers and show that the measured low value of cell loss   ratio meant no data or information loss occurring in the ATM payload, which indicates   our proposed technique successfully eliminates any kind of bit errors in the incoming   signal, and the technique does not require any retransmission of lost information or   data.     

KEYWORDS : Error detection and correction, asynchronous transfer mode, cell loss ratio, fuzzy logic.     

Author: Abu Bakar Hasan, Masuri Othman , Jamaludin Omar and Mahamod lsmail
Year: 2005
a_parametric_aeroelastic_analysis_of_a_thin_flat_plate_in_subsonic_flow_0.pdfA PARAMETRIC AEROELASTIC ANALYSIS OF A THIN FLAT PLATE IN SUBSONIC FLOW
  
ABSTRACT :
This paper describes fundamental work in computational parametric aeroelastic analysis of a thin flat plate clamped at the leading edge and exposed to subsonic   airflow. The plate's equation of motion was modeled using Newton's Law of Motion while the airflow was modeled using the Small Disturbance Unsteady Aerodynamic theory. The aeroelastic analyses were performed at various aspect and mass ratios and were  validated with published work. Results show that the flutter velocity and flutter frequency decreases as the aspect ratio and mass ratios of the plate increases. 

KEYWORDS : Flutter, subsonic flow, aspect ratio, mass ratio.

Author: Dayang Laila Majid and ShahNor Basri
Year: 2005