An Approach Designing Autonomous Robot Navigation System Based On Behavior Coordination,
2017
Universiti Brunei Darussalam
An Approach Designing Autonomous Robot Navigation System Based On Behavior Coordination, Ngo Long Thanh, Pham Long The, Nguyen Phuong Hoang
ASEAN Journal on Science and Technology for Development
Robot navigation using fuzzy behavior is suited in unknown and unstructured environment in which each behavior have an individual task. This paper deals with an approach designing autonomous robot navigation system based on fuzzy behaviors including collision avoidance, wall-following, go-to-target. The proposed hierarchy of fuzzy behaviors is used to fuse the command in which each behavior is a fuzzy inference system and its outputs are fuzzy sets. Its inputs are information fused from sensors using fuzzy directional relationship. The simulation results with some statistics show that the system works correctly.
Flexural Stress Analysis Of Rigid Pavements Using Axi-Symmetric And Plane Strain Fem,
2017
Universiti Brunei Darussalam
Flexural Stress Analysis Of Rigid Pavements Using Axi-Symmetric And Plane Strain Fem, Sawant V.A., Norazzlina M.S.
ASEAN Journal on Science and Technology for Development
The design of pavement involves a study of soils and paving materials, their response under load for different climatic conditions. In the present study, an attempt has been made to compare stresses predicted using two finite element analyses. First analysis is based on the twodimensional plane strain assumption where as in second approach axi-symmetric condition is assumed to consider three-dimensional behavior of rigid pavement. The results are compared with flexural stresses obtained from conventional Portland Cement Association method. The computed flexural stresses obtained from axi-symmetric condition are found to be in close agreement with PCA method. Results of plane strain …
Design And Implementation Of A Vhdl Processor For Dct Based Image Compression,
2017
Universiti Brunei Darussalam
Design And Implementation Of A Vhdl Processor For Dct Based Image Compression, Islam Md. Shabiul, Bhuyan M.S., Beg M. Salim, Othman Masuri
ASEAN Journal on Science and Technology for Development
This paper describes the design and implementation of a VHDL processor meant for performing 2D-Discrete Cosine Transform (DCT) to use in image compression applications. The design flow starts from the system specification to implementation on silicon and the entire process is carried out using an advanced workstation based design environment for digital signal processing. The software allows the bit-true analysis to ensure that the designed VLSI processor satisfies the required specifications. The bit-true analysis is performed on all levels of abstraction (behavior, VHDL etc.). The motivation behind the work is smaller size chip area, faster processing, reducing the cost of …
Simulated-Data Adaptation Based Piecewise Linear Transformation For Robust Speech Recognition,
2017
Universiti Brunei Darussalam
Simulated-Data Adaptation Based Piecewise Linear Transformation For Robust Speech Recognition, Thatphithakkul Nattanun, Kruatrachue Boontee, Wutiwiwatchai Chai, Marukatat Sanparith, Boonpiam Vataya
ASEAN Journal on Science and Technology for Development
This paper proposes an efficient method of simulated-data adaptation for robust speech recognition. The method is applied to tree-structured piecewise linear transformation (PLT). The original PLT selects an acoustic model using tree-structured HMMs and the acoustic model is adapted by input speech in an unsupervised scheme. This adaptation can degrade the acoustic model if the input speech is incorrectly transcribed during the adaptation process. Moreover, adaptation may not be effective if only the input speech is used. Our proposed method increases the size of adaptation data by adding noise portions from the input speech to a set of prerecorded clean …
Survivability In Metro Ring Network Using Oxadm,
2017
Universiti Brunei Darussalam
Survivability In Metro Ring Network Using Oxadm, Ab-Rahman Mohammad Syuhaimi, Shaari Sahbudin
ASEAN Journal on Science and Technology for Development
The optical cross add and drop multiplexing (OXADM) node described in this paper increases the capacity, flexibility and reliability of the trunk-line optical network used for data communication. It features two different bandwidths which operate in working and protection line in a ring configuration. The OXADM has the same features of the conventional OADM node but with more efficiency and reliability. The OXADM prototype system focuses on providing survivability through restoration against failures, such as cable/fiber cut in optical layer with ring topology. Two types of restoration scheme have been proposed to ensure data flow continuously by means of linear/ …
Optical Studies Of Penicillin Group In Relation To Their Medical Activity,
2017
Universiti Brunei Darussalam
Optical Studies Of Penicillin Group In Relation To Their Medical Activity, Kumar R. Jeevan, Prasad G.V.R., Shoaib S.Md., Devadanam G. Paul, Fakruddin K.
ASEAN Journal on Science and Technology for Development
The study of Medical activity of antibiotics is gaining momentum now a days owing to the importance of their curative values. The Medical Activity correlated to molecular interactions,can be studied by various physical techniques, at present optical methods like Refractometry and Polarization are used to study the activity of a few antibiotics like Penicillin. The Refractive Indices Mean Molecular Polarizability Diamagnetic Susceptibilities and Electron Ionisation Cross Section are interpreted in terms of dosages and the toxic effects if any due to over dosages are discussed critically.
Electroresponsie Behavior Of Polyelectrolyte Gels (Acrylic Acid-Co-N-N' Methylene Bisacrylamide) Under The Influence Of Electric Field,
2017
Universiti Brunei Darussalam
Electroresponsie Behavior Of Polyelectrolyte Gels (Acrylic Acid-Co-N-N' Methylene Bisacrylamide) Under The Influence Of Electric Field, Nam Nguyen Phuong Hoai, Mendes Eduado
ASEAN Journal on Science and Technology for Development
Polymer gels which were synthesized from acrylic acid and N-N’ methylene bisacrylamide exhibited electrical sensitive behavior. Their swelling properties and electroresponsive behavior were studied. The results indicated that the water take-up ability of the hydrogel increased with the decreased N-N’ methylene bisacrylamide content within the network. The hydrogel membranes swollen in a neutral NaCl solution, bent toward the cathode under non-contact DC electric fields, and their bending speed and equilibrium strain increased with the increased of applied voltage. In addition, the effect of crosslinker concentration of N-N’ methylene bisacrylamide on bending behavior of the gels have been studied. The equilibrium …
A Review On Energy Efficiency Standards And Labels: Present Status And Implementation Possibilities In Malaysia,
2017
Universiti Brunei Darussalam
A Review On Energy Efficiency Standards And Labels: Present Status And Implementation Possibilities In Malaysia, Mahlia, T.M.I., Masjuki, H.H., Choudhury I.A., R. Saidur And R. Saidur
ASEAN Journal on Science and Technology for Development
This article is a review on energy efficiency standards and labels for household electrical appliances around the world. Through the review of other country experiences on energy efficiency standards and labels, we attempt to identify savings possibilities in Malaysian households. The implementation possibilities of standards and labels for various household electrical appliances in Malaysia are also examined. It is found that various household appliances in Malaysia offer some potential in reducing electricity consumption. Finally, it is concluded that there are many advantages for Malaysia to implement the standards and labels for household electrical appliances as soon as possible in order …
Duration Limit Of Laser Pulses Emitted From A Ce-Doped Crystal Short Cavity,
2017
Universiti Brunei Darussalam
Duration Limit Of Laser Pulses Emitted From A Ce-Doped Crystal Short Cavity, Hai Le Hoang, Hung Nguyen Dai, Hoa Hoang Huu, Quema Alex V. V., Sarukura Nobuhiko
ASEAN Journal on Science and Technology for Development
Based on the rate equation set for broadband cavities, the dependence of pulse duration on cavity and pumping parameters is analyzed. The cavity uses a Ce-doped crystal as a gain medium. Computation results show the variation of the pulse width with the change of cavity length, mirror reflectivity, pumping energy and pumping pulse duration. A significant influence of multiple-pulse operation in limiting pulse duration is realized and a pulse-width of the order 200 ps is found to be the limit for the direct generation of ultraviolet single picosecond pulses from a Ce:LLF short cavity.
Co Cluster Formation In Tio2 Dms And A Method Of Estimation,
2017
Universiti Brunei Darussalam
Co Cluster Formation In Tio2 Dms And A Method Of Estimation, Hong Le Van, Thuan Nguyen Chi, Dai Nguyen Van, Phuc Nguyen Xuan
ASEAN Journal on Science and Technology for Development
The paper presents experimental observations of the Co cluster formation in TiO2/Co powder samples prepared by the Sol-Gel method. The obtained X-ray diffraction patterns and Raman scattering show that the anatase phase of TiO2 was successfully synthesized at an annealing temperature of 450°C. Comprehensive studies by means of X-ray diffraction, Raman scattering, thermal magnetization in a temperature range of 300–1000 K and magnetic hysteresis at room temperature confirm that a part of Co did not substitute for Ti in TiO2 structure, otherwise it has reasonably formed cluster of Co in samples. Based on the thermal magnetization curves a method to …
Synthesis And Photoluminescence Studies On Zinc Oxide Nanowires,
2017
Universiti Brunei Darussalam
Synthesis And Photoluminescence Studies On Zinc Oxide Nanowires, Long Nguyen Ngoc, Dai Ngo Xuan, Hien Nguyen Thi Thuc
ASEAN Journal on Science and Technology for Development
Semiconductor single crystal ZnO nanowires have been successfully synthesized by a simple method based on thermal evaporation of ZnO powders mixed with graphite. Metallic catalysts, carrying gases, and vacuum conditions are not necessary. The x-ray diffraction (XRD) analysis shows that the ZnO nanowires are highly crystallized and have a typical wurtzite hexagonal structure with lattice constants a = 0.3246 nm and c = 0.5203 nm. The scanning electron microscopy (SEM) images of nanowires indicate that diameters of the ZnO nanowires normally range from 100 to 300 nm and their lengths are several tens of micrometers. Photoluminescence (PL) and photoluminescence excitation …
Concentrations Of Lead (Pb) In Road Dust In Bandar Seri Begawan, Brunei Darussalam,
2017
Universiti Brunei Darussalam
Concentrations Of Lead (Pb) In Road Dust In Bandar Seri Begawan, Brunei Darussalam, Emran, Shahrizal, Fernando, K. Rodney, Radojevic And Miroslav Radojevic
ASEAN Journal on Science and Technology for Development
A first-ever survey oflead (Pb) in road dust in Bandar Seri Begawan (B.S.B.), the capital of Brunei Darussalam, was carried out in 1996, three years after the introduction of unleaded petrol. The concentration of Pb at 114 sites varied between 12 and 544 µg/g (mean: 125 µg/g; standard deviation: 103 µg/g). There was a significant correlation (r=0.546) between lead in road dust and traffic volume at 17 sites for which traffic counts were available. An assessment of the potential hazard posed to children was made. It is concluded that concentration levels of Pb in road dust in B.S.B. are considerably …
Fermentation Of Oil Palm Trunk Acid Hydrolysate To Ethanol,
2017
Universiti Brunei Darussalam
Fermentation Of Oil Palm Trunk Acid Hydrolysate To Ethanol, Yeoh H. H., Lim K. O., Mashitah M. D.
ASEAN Journal on Science and Technology for Development
Studies on the feasibility of using oil palm trunk acid hyd10lysates as a substrate for ethanol p10duction using the yeast Saccha10myces cerevisiae were carried out in shake flask culture. The effect of pH and fermentation time on the rate of ethanol p10duction were investigated. Results showed that with 3 hours fermentation period, the highest ethanol yield was obtained at pH 4.75. This yield was about 14% of the dry weight of the sample used; thus giving a fermentation efficiency of 94.7%.
Study On The Osmotic Pre-Treatment And Infrared Radiation On Drying Kinetics And Colour Changes During Drying Of Agricultural Products,
2017
Universiti Brunei Darussalam
Study On The Osmotic Pre-Treatment And Infrared Radiation On Drying Kinetics And Colour Changes During Drying Of Agricultural Products, Chou, S. K., Chua, K. J., Mujumdar A. S., Tan And, M., Tan S. L.
ASEAN Journal on Science and Technology for Development
A combination of intermittent infrared and continuous convection heating was used to dehydrate various osmotically pretreated sample of potato (in solutions of 10%, 20% and 30% NaCl) and pineapple (in solutions of 30%, 50%, 70% Brix). In one set of runs, the infrared source was turned on and off sequentially according to a predetermined time schedule. In the other set, a thermocouple located on the surface of the drying slice exposed to the radiant heat flux measured the temperature continuously and cut off the infrared source automatically when the surface temperature reached 36 to 45°C. The effect of osmotic-IR conditions …
Magneto-Optic Properties And Oxidation/Reduction Of Ultrathin Magnetic Films: Fe Films On Pt(111),
2017
Universiti Brunei Darussalam
Magneto-Optic Properties And Oxidation/Reduction Of Ultrathin Magnetic Films: Fe Films On Pt(111), Nahm T.-U.
ASEAN Journal on Science and Technology for Development
We have investigated magneto-optic properties of ultrathin Fe films grown on Pt(111) surfaces by using the in situ surface magneto-optic Kerr effect (SMOKE) and X-ray photoelectron spectroscopy (XPS). SMOKE measurements show that the Fe layers are not ferromagnetic when the film is thinner than approximately 4.5 MLs (monolayers), but the in-plane magnetization is present for a 4.1 ML Fe film on Pt(111) annealed at 550 K. Upon post-annealing at 770 K, a 9.2 ML Fe film does not show any Kerr signal, while a 6.3 ML Fe film has the in-plane Kerr signal with increased coercivity. The oxidation and reduction …
Whispering Gallery Mode Lasers In Erbium/Ytterbium Codoped Phosphate Glasses,
2017
Universiti Brunei Darussalam
Whispering Gallery Mode Lasers In Erbium/Ytterbium Codoped Phosphate Glasses, Tam Tran Thi, Trung Dang Quoc, Minh Le Huu, Vu Tran Anh, Chung Do Ngoc, Feron Patrice
ASEAN Journal on Science and Technology for Development
The study of whispering gallery mode laser in Er3+/Yb3+ co-doped phosphate glass microsphere has been reported. The coupling was carried out by fiber half taper technique. The microsphere lasers have been studied under pumping at 980 nm, to take full advantage of energy transfer effect from ion Ytterbium to ion Erbium. The observed lasing range extends from 1533 nm to 1612 nm.
Investigation Of Zno Nano Structures Fabricated On Al2o3 Substractes By Mocvd,
2017
Universiti Brunei Darussalam
Investigation Of Zno Nano Structures Fabricated On Al2o3 Substractes By Mocvd, Binh Nguyen Thanh, Bich Vu Thi, Segawa Y.
ASEAN Journal on Science and Technology for Development
High quality ZnO nanostructures were grown directly on sapphire subtracts by metal organic vapor deposition. By changing the growth conditions, the different nano structures (nanorods,nanotubes, nanowalls, nanonetworks) can be selectively. These nanostructures were all epitaxially grown and had the same epitaxial relationship with respect to the substrate. Mechanisms corresponding to different nanostructures were discussed. The nanostructures exhibited stable excitonic states at room temperature, and the emission due to exciton-exciton scattering was observed
Spin-Polarized Photocurrent Through Quantum Dot Photodetector,
2017
Universiti Brunei Darussalam
Spin-Polarized Photocurrent Through Quantum Dot Photodetector, Hieu Nguyen Van, Ha Nguyen Bich
ASEAN Journal on Science and Technology for Development
The theory of the photocurrent through the photodetector based on a two-level semiconductor quantum dot (QD) is presented. The analytical expressions of the matrix elements of the electronic transitions generated by the absorption of the circularly polarized photons are derived in the lowest order of the perturbation theory with respect to the electron tunneling interaction as well as the electron-photon interaction. From these expressions the mechanism of the generation of the spin-polarized of electrons in the photocurrent is evident. It follows that the photodetector based on the two-level semiconductor QD can be used as the model of a source of …
Spectrophotometric Method For Hg(Ii) Determination In Aqueous Environment Using Zinc-Dithizonate Complex,
2017
Universiti Brunei Darussalam
Spectrophotometric Method For Hg(Ii) Determination In Aqueous Environment Using Zinc-Dithizonate Complex, Ahmad, Musa Ahmad, Marsom Elya Sufliza, Hamzah Harun
ASEAN Journal on Science and Technology for Development
This article described the use of zinc-dithizonate for spectrophotometric determination of Hg(II) in aqueous environment. Zinc dithizonate was found to react selectively with Hg(II) to give a reddish yellow complex with optimum absorbance at pH 1.0. This complex was found to be useful for spectrophotometric determination of aqueous Hg(II) in the concentration range of 1.0 - 12.0 ppm. This method was also found to be reproducible with calculated relative standard deviation, RSD of 1.08%. At 1:1 mole ratio, interfering ions such as CH COO·, Pb2+ and Ag+ were found to interfere at degree 3 of interference of more than 10.0%.
Cvd Prepared Mn-Doped Zno Nanowires,
2017
Universiti Brunei Darussalam
Cvd Prepared Mn-Doped Zno Nanowires, Phan T.L., Vincent R., Cherns D., Nghia N.X.
ASEAN Journal on Science and Technology for Development
Mn-doped ZnO nanowires prepared by chemical vapor deposition (CVD) were obtained in the temperature range of 450–500°C. X-ray diffraction patterns, SEM and TEM images indicate that crystals with a hexagonal structure grow along the c axis. At low Mn-doped concentrations, photoluminescence (PL) and Raman scattering (RS) spectra are almost independent of the Mn doping. However, the increase in concentration of Mn above 1.6 at% weakens significantly the PL signal and the RS-lines intensity in the low wavenumber range of 300–480 cm-1, and concurrently increases the RS-lines intensity in the higher wavenumber range of 480-700 cm-1.. Magnetic measurements determined the Curie …
