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Computer Simulation of a Programmable Arithmetic and Logic Unit D.J. McNeill Institut Teknologi Brunei Abstract
This paper contains details of a novel simulation to illustrate the
basic features of the operation of the arithmetic and logic unit (ALU)
of a microprocessor. The simulation uses a model of a 74181 device which
is a combinational ALU. The device is modified for sequential operation
by the addition of an accumulator. Stored program control is achieved
through the use of the data entry and storage facilities of a word
generator. Basic microprogramming operations are established by the
inclusion of additional storage registers which act as condition code
indicators. Sample program listings are provided. |
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Access Network for High Speed Data Communication M M Poulose and Pg Suhaimi bin Pg Hj Bakar Institut Teknologi Brunei Abstract
This paper presents various aspects of
developing an access network for high speed data communications using
the existing copper cables. In recent years, there has been a phenomenal
growth in data communication services including the Internet. The
ever-increasing multimedia content such as pictures, video clips and
audio on the Internet has placed an increasing demand for higher access
speeds. This has led to the development of a family of digital
subscriber line (DSL) technologies capable of delivering megabits of
data over existing unshielded twisted pair. Several short and long term
options available to implement these DSL technologies in a typical
telecommunication scenario, such as in Brunei Darussalam, are presented.
It is shown that the upcoming technologies can meet the challenges of
the high bandwidth multimedia applications such as smart schools, tele-shopping
etc. |
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Islamic Banking: An Overview Rafiqul Islam Institut Teknologi Brunei Abstract
Across the Muslim world, there is a move to
create Islamic financial institutions. Islamic banking has gained
considerable momentum since the second half of the 1970s and is
currently operative in two basic forms in more than forty-five
countries. One of the fundamental changes envisaged in the wake of the
Islamic transformation of a modern economy is replacement of the
institution of interest by profit-sharing. An attempt is made in this
paper to trace the growth and development of Islamic banking and to
highlight its salient characteristics. An outline of banking will be
presented in an Islamic framework and the main focus will be on the
rationale for the abolition of interest from Islamic banking and its
replacement by Profit-Sharing. Also an endeavour will be made to explore
and explain briefly the Islamic financial instruments. The concluding
section will outline the relative importance and relevance of the
monetary instruments for regulation money supply in an environment of
Islamic banking. The paper is based on some available writings of
various scholars. |
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Designing a network - The ITB experience, A case study Voon Nyuk Hiong, Wong Pong Kit and Yeo Sy Mey Institut Teknologi Brunei Abstract
Setting up a network involves both the
building of the physical infrastructure and the network infrastructure
in order to deliver facilities and services to users. The ITB Network is
campus-wide in excess of 500 users concurrently. This paper examines the
success and highlights the areas that could lead to network problems. It
also attempts to come up with a framework for future emulation towards
the building of small to medium sized networks. |
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In-cylinder Fuel Injection of Spark Ignition Engines: Computer and Experimental Study on Fuel Spray Analysis Hakim A Abbass and Tariq Mahmood Institut Teknologi Brunei Abstract
Stringent legislation on exhaust emissions
and economic fuel consumption have led to intensified efforts for the
development of new strategies for fuel injection in spark ignition (SI)
petrol engines. In-cylinder (direct) fuel injection is one of these
strategies in which fuel is injected directly inside the engine
cylinder. In this study, direct fuel injection in an SI engine is
investigated through a three-dimensional computer model for two phase
flow. FLUENT software is used with appropriate boundary conditions to
compute air-flow velocities for engine speeds of 1500 and 3000 rpm. Fuel
spray injected inside the cylinder with a spray and of 22.7°, fuel
droplets with initial diameter of 50 microns at the injector tip, and
initial droplet velocities for injector angles of 90° and 60° in x-z
plane are used to study fuel spray distribution. Results show that the
maximum air velocity is at the tip of the inlet valve. High turbulent
domains on both sides of the inlet valve and a stagnant domain below the
valve face are observed. Positioning the fuel injector just above the
valve shoulder with an offset angle of 30° results in a significant
improvement in the fuel spray distribution in the cylinder and reduced
fuel impingement on the piston head. The above predictions have been
verified in an experimental study by capturing the real time images of
fuel spray directly injected inside the cylinder of a running engine
using a fast response laser imaging system. |
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