Skip Navigation LinksVolume : Volume 17 No.1 2008

  
  
  
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the_development_of_a_product_design_support_tool_using_manufacturing_cycle_time.pdfTHE DEVELOPMENT OF A PRODUCT DESIGN SUPPORT TOOL USING MANUFACTURING CYCLE TIME
  
ABSTRACT :
his paper addresses the development of a product design support tool  based on mathematical model related to cycle time information, that is by modeling a multistage,   multi-product production line system that can process a variety of products in a batch  production environment. Products are processed according to a predefined sequence. The  design tool is intended to be used at the early phase of product design in view of assisting   the product development team develop products in a shorter time. This paper discussed the development of the support tool based on manufacturing data obtained from an industrial   partner.       

KEYWORDS : Multi-stage production line, cycle time, mathematical model, product design support tool       

Author: Muhammad Marsudi, Dzuraidah Abdul Wahab, Che Hassan Che Haron and Sulaiman Haji Hasan
Year: 2008
steady-state_voltage_stability_analysis_using_continuation_power_flow_a_review.pdfSTEADY-STATE VOLTAGE STABILITY ANALYSIS USING CONTINUATION POWER FLOW : A REVIEW
  
ABSTRACT :
Continuation power flow can be described as a power flow   solution, which is used to analyze the stability of power system under   normal and disturbance conditions. The main purpose of Continuation    Power Flow is to find a continuity of power flow solution for a given load   change. Although this approach has several deficiency, many researchers   found out that this is still a better approach to cater the problem faced by   the previous method (Newton-Raphson dan Fast Decoupled Load Flow).   The continuation step, parameter variation and the reliability of the system   are still in question. This paper discusses several issues including the   needs, demands and expectations of continuation power flow. Several  solutions have been proposed by the previous researchers is been discussed. 

KEYWORDS : Bifurcation, contingency, continuation power flow,         parameter variation, voltage stability       

Author: J. Jasni, H.Hizam, M.Z.A Kadir, N. Mariun, S. Bahari
Year: 2008
prediction_of_cutting_force_model_by_using_artificial_intelligence_and_response_surface_method.pdfPREDICTION OF CUTTING FORCE MODEL BY USING ARTIFICIAL INTELLIGENCE AND RESPONSE SURFACE METHOD
  
ABSTRACT :
Prediction of cutting force of metals by simulation before machining is carried out is considered very important in order to save machining cost especially in ensuring longer life of cutting tools. This paper describes the use of neural network, fuzzy logic and response surface method to predict the cutting force model of P20 tool steel. The cutting force is taken   as a response whereas the variables used are cutting speed, feed rate, axial depth and radial depth. A model of cutting force is developed using response surface method and has been compared with artificial intelligence method. The models obtained using neural network, fuzzy logic and response surface method are compared and presented in this paper. The result of   this cutting force prediction is found to be satisfactory since the results are similar to experimental  results. This result shows that feed rate has the most significant effect on the cutting force, followed by axial depth, radial depth and cutting speed. 

KEYWORDS : Cutting force, Surface Response Method, fuzzy logic, neural network

Author: Kumaran Kadirgama, Bashir Mohammad Habeeb Hattab Habeeb, Khaled Abou EI-Hossein
Year: 2008
powder_metallurgy_and_applications_of_hardmetals.pdfPOWDER METALLURGY AND APPLICATIONS OF HARDMETALS - THE OPPORTUNITIES FOR MALAYSIAN INDUSTRIES
  
ABSTRACT :
The development of new hardmetals during the past few years  has focus strongly on fine, extra-fine (sub-micron), ultra-fine and nanostructured  materials. Significant innovations have occurred and the move   towards 'ultra-fine and nano-grained' hardmetals is attracting even more   attention. Moreover, the increasing use of high-performance materials makes  it possible to manufacture components with outstanding properties. These developments have brought about considerable improvements in tool life,mechanical properties and performance achievement in service applications. The special properties of hardmetals have made them an indispensable material not just in metal cutting. Tailored hardmetal alloys are also used in  mining tools, wear parts, structural components, and in forging and forming   tools.    

KEYWORDS : hardmetals, ultra-fine, nano-structured, metal cutting.

Author: Mohd Asri Selamat, Nor lzan lzura Mansor, Noraizham Mohamad Diah
Year: 2008
method_of_quantitation_for_paraquat_herbicide_and_monitoring_of_its_levels_in_selected_malaysian_rivers.pdfMETHOD OF QUANTITATION FOR PARAQUAT HERBICIDE AND MONITORING OF ITS LEVELS IN SELECTED MALAYSIAN RIVERS
  
ABSTRACT :
Residual levels of paraquat in two major Malaysian   rivers was quantified using solid phase extraction (SPE) cartridges and high performance liquid chromatography (HPLC). The assay   method provided adequate sensitivity, specificity, linearity, accuracy, and precision. Inter-day precision and percentage inaccuracy were between -2.4 % and 0.9%, Intra-day precision and percentage  inaccuracy were between -11.2% and 8.6% and average recovery was between 81%-98%. Limit of quantitation (LOO) and limit of  detection (LOD) for this method was 0.6 ng/ml and 0.3 ng/ml respectively. Paraquat was detected in two Malaysian rivers mainly   in the range of ppb. The highest concentration of paraquat was observed in Pertang (1 .83 ng/ml) and Klang (2.29 ng/ml) rivers.       

KEYWORDS : Paraquat; parts per million, HPLC, solid phase   extraction     

Author: Aloysius Umelo lguegbe and Mustafa Ali Mohd
Year: 2008
method_development_and_validation_for_analysis_of_urinary_bisphenol_a_by_gas_chromatography_mass_spectrometer_gcms.pdfMETHOD DEVELOPMENT AND VALIDATION FOR ANALYSIS OF URINARY BISPHENOL A BY GAS CHROMATOGRAPHY - MASS SPECTROMETER (GCMS)
  
ABSTRACT :
A sensitive gas chromatograph-mass spectrometric (GCMS) method for the determination of bisphenol A in human urine sample was developed and validated. Bisphenol A   was extracted from urine sample by solid phase extraction (SPE) using C18 cartridge. Bisphenol A-d14 analogue was used as surrogate standard. Addition of bisphenol A-d14 and enzymatic        deconjugation of the urine sample was performed prior to solid phase extraction to determine  total bisphenol A originating from free bisphenol A and bisphenol A-glucuronide. Bisphenol A was   analysed after derivatization with BSTFA using GCMS with quadrapole detector in selected ion   monitoring (SIM) mode. Mean recoveries for bisphenol A were 92.1%, 98.7% and 94.5% at 0.1, 0.5, and 0.9 ng/ml concentration, respectively. The quantification limit for bisphenol A in urine was  0.05 ng/ml. Total bisphenol A in urine samples collected randomly from the general public range   from <0.05ng/ml to 5.5 ng/ml (n = 40) with a median concentration of 1.3 ng/ml. Free bisphenol   A was detected only in seven urine samples. Determination of total bisphenol A requires the use   of ßglucuronidase to enzymatically hydrolyse and release the conjugates before extraction. Two  different analyses were conducted to determine free bisphenol and total bisphenol A.       
KEYWORDS : Bisphenol A, solid phase extraction (SPE), Gas Chromatograph - Mass Spectrometer (GCMS)            

Author: Letchumi Thannimalay, Chen Sau Soon and Mustafa Ali Mohd
Year: 2008
mems_sensor_in_intelligent_tyre_pressure_monitoring_system.pdfMEMS SENSOR IN INTELLIGENT TYRE PRESSURE MONITORING SYSTEM
  
ABSTRACT :
The use of a micro electromechanical system (MEMS) pressure  sensor in an intelligent tyre pressure monitoring system (TPMS) is described in this paper. The study involves the analysis of the MEMS sensory data that contributes significantly towards the enhancement of the TPMS. A detailed overview   on the sensor, theory of operation, the assembled TPMS prototype and  experimental data analysis were presented in this paper. For the purpose of this   experimental study, data acquisition was performed on the intelligent prototype TPMS that was fitted on to a tyre rim. Threshold check was used to acquire the TPM output signal on tyre pressure and temperature data. A complete set of  information for all four tyres comprising the measured pressure, temperature, receiver wake-up signal, header, tyre ID, checksum, and end of message in the TPMS receiver were also analyzed. Results obtained from the experiments have successfully validated the usefulness of the MEMS sensor in a TPMS. 

KEYWORDS : MEMS, TPMS, Sensor, Sensor Mounting

Author: D. A. Wahab, MA Hannan, H. Sanusi, S. Abdullah and A. Hussain
Year: 2008
hydrocracking_of_gas_oil_over_nimo_al20_3_catalyst.pdfHYDROCRACKING OF GAS OIL OVER NiMo/Al20 3 CATALYST
  
ABSTRACT :
Commercial nickel molybdenum supported on   alumina catalyst NiMo/Al2O3 was used for hydrocracking of gas oil under various operating conditions, reaction temperature in range 300-450°C, contact time 30-120 min and catalyst to feed ratio 0-0.08 using newly designed high-pressure shaking reactor.   The product consists mainly from liquid, gas and coke. A total conversion of 59.61wt% and a maximum value of 51.91wt% of  liquid product (total distillate fuels) were obtained at temperature   of 450°C, 90 minutes contact time and 0.04 catalyst to feed ratio.  Product distributions under different experimental conditions were presented and discussed. 

KEYWORDS : Petroleum gas oil, NiMo/Al2O3 catalyst, a highpressure   shaking reactor.

Author: B. H. Hameed, A. M. Alsobaai, R. Zakaria
Year: 2008
evaluation_of_different_cutting_tools_when_milling_vanadis_10.pdfEVALUATION OF DIFFERENT CUTTING TOOLS WHEN MILLING VANADIS 10
  
ABSTRACT :
This paper describes a study on the effects of work piece hardness, feed rate, cutting speed, and axial depth on the output parameters of tool life   and surface roughness finishing when machining raw material of Vanadis 10   using KC850 and K313 Kennametal inserts. The Vanadis 10 is widely applied in manufacturing of dies and moulds especially in applications where tooling made   from cemented carbide tends to chip off or crack. Statistical analysis method   utilizing response surface methodology (RSM) is applied and shows that the   effects on tool life and surface finish roughness are statistically significant. The  workpiece hardness and other factors played significant roles.       

KEYWORDS : Workpiece, surface roughness, hardening, Vanadis 10, response surface methodology       

Author: Habeeb Hattab AI-Ani. Bashir Mohamad, Kumaran Kadirgama,Khaled Abou El- Hossein
Year: 2008
critical_review_on_the_need_for_insulation_coordination_studies_in_malaysia.pdfCRITICAL REVIEW ON THE NEED FOR INSULATION COORDINATION STUDIES IN MALAYSIA
  
ABSTRACT :
Insulation coordination models are an essential part of power   system studies and are used to determine the expected overhead line   backflashover rate. This paper gives a general background of the insulation    coordination and explains its importance. The need to perform lightning-strike studies for insulation coordination of high voltage lines is discussed in terms of  the levels of interruptions / damage that result from such events. The paper explains the lightning overvoltage and gives the importance of lightning protection   for transmission lines. The process of backflashover and methods in computing   backflashover and shielding failures rates will also be discussed, particularly the comparison between the CIGRE and IEEE methods. 

KEYWORDS : Insulation coordination, backflashover, shielding failure, lightning     

Author: Mohd Zainal Abidin A.K., Mohd Hamizi A., Jasronita J. and Wan Fatinhamamah W.A.
Year: 2008
compaction_and_characterization_of_spherical_shape_titanium_powders_for_potential_medical_and_dental_applications.pdfCOMPACTION AND CHARACTERIZATION OF SPHERICAL SHAPE TITANIUM POWDERS FOR POTENTIAL MEDICAL AND DENTAL APPLICATIONS
  
ABSTRACT :
In this paper two different diameters of spherical shape    commercial pure titanium powders were compacted using simple pressand-   sinter method, in order to find if this route can be applied to produce   good sintered samples. Part of this work was done on Ti-6Al-4V (wt%)   composition with irregular shape aluminium and vanadium powders. Effect   of various experimental parameters (compaction pressure, sintering   temperature and sintering environment) on the density and hardness as   well as sample forming ability in the pure titanium and Ti-6Al-4V alloy are   investigated. The success of this method depends on the quality of the powders, correct processing technique, and the properties of the sintered   samples.       

KEYWORDS : Titanium, powder metallurgy, metal implant         25       

Author: Mohmad Soib Selamat, Faqhih Salmi Ibrahim and Mohd. ldrus Sidik
Year:
commissioning_the_upm_satellite_simulator_facility_platform.pdfCOMMISSIONING THE UPM SATELLITE SIMULATOR FACILITY PLATFORM
  
ABSTRACT:
The purpose of this paper is to test and validate the UPM Satellite  Simulator Facility (SSF) platform. The work relates to satellite testing and   qualification experiments. The satellite Attitude Determination and Control System (ADCS) consist of flight-proven equipment from Canada, Germany and America.   The flight hardware check has to be performed for the SSF qualification.   Therefore, dedicated test procedures in order to test and verify the satellite control   mode (i.e., Idle mode, Detumble mode, Coarse Pointing mode and Fine Pointing   mode) has to be implemented. The results of these experiments are discussed to qualify the health of the satellite itself and the ADCS equipment. The UPM   SSF responded very well to all the conducted tests and therefore, its performances are validated.

Author: Low Yee Seng, Renuganth Varatharajoo, Nizam Filipski
Year: 2008
basic_characteristic_of_linear_displacement_sensor_using_meander_coil_and_patiern_guide.pdfBASIC CHARACTERISTIC OF LINEAR DISPLACEMENT SENSOR USING MEANDER COIL AND PATIERN GUIDE
  
ABSTRACT :
Linear displacement sensor is used to detect the actual  displacement of the moving objects in the Linear DC Motor (LDM) (Wakiwaka et   al, 1996). The accuracy of the detection is very important to make sure the   production process operate properly. The displacement sensor based on the  inductive concepts has been developed. It is composed of the sensor head and  pattern guide. The combination of the sensor head and pattern guide is important   to get the high accuracy of the positioning. Sensor head is made from copper  material while pattern guide is made from soft iron SS400. The displacement of   pattern effects to the output voltage for various input frequency and exciting   voltage has been observed and discussed in this paper. From the results obtained,output voltage increases as the input frequency and exciting voltage increases.   In term of hysteresis and linearity, input frequency 20kHz and exciting voltage   1.0 volt is the best performance of sensor. 

KEYWORDS : Linear displacement sensor, displacement, accuracy, inductive,   sensor head, pattern guide, output voltage, input frequency, exciting voltage, hysteresis, linearity.  

Author: M. Norhisam, A. Norrimah, R. Wagiran, Roslina. M.Sidek, N. Mariun, H. Wakiw
Year: 2008
application_of_quality_function_deployment_in_the_design_and_fabrication_of_an_anthropometrics_measuring_equipment.pdfAPPLICATION OF QUALITY FUNCTION DEPLOYMENT IN THE DESIGN AND FABRICATION OF AN ANTHROPOMETRICS MEASURING EQUIPMENT
  
ABSTRACT :
This paper aims to demonstrate how the QFD technique helps the authors to   design an anthropometrical measuring equipment based on the input of the users. The development steps began by conducting a survey of users or customers to identify their wants and evaluate the current equipment, drawing planning matrix, identify and drawing technical requirements of the equipment, and perform technical benchmarking to improve the performance of current equipment to complete the QFD matrix. Based on the QFD matrix, 3 different conceptual designs of anthropometrics measuring equipment were generated. By   using the scoring matrix concept, the authors then selected the best design to be fabricated. Prior to anthropometrics survey, trial on anthropometrical measurement was conducted on  the fabricated prototype to investigate how well it is fit for use to measure the anthropometrics   dimensions. The authors found that this fabricated anthropometrical measuring equipment   could be used to measure forty-six anthropometrical dimensions in the sitting and standing   posture, based on trial anthropometrics measurement.       

KEYWORDS: Anthropometrics, users, QFD, conceptual design , prototype         

Author: Yanto, Baba Md Deros, Hotma A. Hutahean and lmelda
Year: 2008
a_combination_approach_of_effective_index_method_and_beam_propagation_method_in_optical_device_modelling.pdfA COMBINATION APPROACH OF EFFECTIVE INDEX METHOD AND BEAM PROPAGATION METHOD IN OPTICAL DEVICE MODELLING
  
ABSTRACT :
A combination of effective index method (El) and twodimensional beam propagation method (20-BPM) is adopted in modelling  a rib optical waveguide structure. An effective index method based on   bisection root finding procedure and 20-BPM simulation based on finite   difference scheme is carried out on MATLAB® programming platform. Results are compared with several numerical and analytical methods including commercially available software from Optiwave® Corporation. Simulated structures showed very promising results with proposed methods. The proposed method can be further used to model a trapezoidal   cross section structure, a typical output from chemical wet-etching optical   waveguide fabrication technique.       

KEYWORDS : Optical waveguide modelling, effective index method, beam propagation method.

Author: Mohd Haniff Ibrahim, Norazan Mohd Kassim, Abu Bakar Mohammad and Shee Yu Gang
Year: 2008