Volume: 2
Number: 2
July-December 2003

To see an article directly, click its Title. To see abstract, click its [Abstract] link.

• DEVELOPMENT OF TWO-STROKE SPARK IGNITION ENGINE WITH MANIFOLD ELECTRONIC CNG INJECTION
  S. Kumarappa, Prabhukumar
  Abstract PDF
  DEVELOPMENT OF TWO-STROKE SPARK IGNITION ENGINE WITH MANIFOLD ELECTRONIC CNG INJECTION
  S. Kumarappa, Prabhukumar

  Abstract

  In this work, a two-stroke spark ignition engine with manifold electronic gaseous fuel injection system was developed for better fuel economy and reduced emissions. The fuel and time maps were generated for various operating conditions of the engine using an electronic system that is designed to access the data using interfaces. For the mapping, the visualization tool used is a three-dimensional plot. From this mapping, the fuel injection time and delivery quantity were estimated for the required running conditions of the engine. The Experiments were carried out at different speeds with a compression ratio of 12:1. The performance and emission characteristics of the engine with CNG as fuel in carbureted mode and newly developed CNG injection system are described. Investigation was also carried out in the manifold injection mode using CNG as fuel to determine the potential for improving the thermal efficiency of an engine to take advantage of the high octane number of natural gas by varying the compression ratio from 6.7 to 12.
• DEVELOPMENT OF A LOW COST PC CONTROLLED LATHE AND IT’S OPERATION BY A CNC PROGRAMME
  Md. Nurul Absar Chowdhury, Ashfaque Ahmed Chowdhury
  Abstract PDF
  DEVELOPMENT OF A LOW COST PC CONTROLLED LATHE AND IT’S OPERATION BY A CNC PROGRAMME
  Md. Nurul Absar Chowdhury, Ashfaque Ahmed Chowdhury

  Abstract

  With the entrance in new millennium, e-manufacturing has become one of the modern way of improving the quality and productivity in manufacturing industries. But now a days e- manufacturing hardwares like CNC milling, drilling are costly to be used in small workshops. This era needs more flexibility in product design. For that purpose industry needs low cost PC controlled based machinery. Objective of this work is to convert an existing manual low cost lathe for operating it with the help of PC. The designed machine has an open loop servo drive control system as there is no change in load conditions. The motor control circuit for the machine is designed on the principle that as the pulse rate increases, the speed of the motor increases and vice versa. Some of the Machine formats and programming formats are as follows: full floating zero, fixed block format, continuous path control system, incremental mode of listing the coordinate positions, and no restriction of giving dimensions (up to three decimal places). Programming format also contains absolute dimensioning mode, dimensions in millimeters, feed rate in mm/min.
• A PROPOSED MANAGEMENT TOOL FOR INIATING NEW PROGRAMMES IN TECHNICAL AND VOCATIONAL INSTITUTES OF OIC MEMBERS COUNTRIES
  Che Kum Clement
  Abstract PDF
  A PROPOSED MANAGEMENT TOOL FOR INIATING NEW PROGRAMMES IN TECHNICAL AND VOCATIONAL INSTITUTES OF OIC MEMBERS COUNTRIES
  Che Kum Clement

  Abstract

  Structured internal and external examination of technical and vocational education programme is unique in the world of curriculum planning and development. Strengths, Weaknesses, Opportunities, and Threats (SWOT) analysis has been a useful tool for industries. The process of utilizing this approach requires an internal survey of strengths and weaknesses of the programme and an external survey of threats and opportunities. Educational examples using the tool are provided by the author. It is a useful way of examining current environmental conditions around programme offerings. This paper proposes the application of the SWOT tool for use as an aid for decision making as new technical and vocational education programmes are planned in the Organisation of the Islamic Conference (OIC) member countries.
• AN EFFICIENT TOKEN BASED ALGORITHM FOR MUTUAL EXCLUSION IN DISTRIBUTED SYSTEM
  Fahim Kawsar, shadriful Hasan, Md. Shahariar Saikat, Md. Abdur Razzaque, M.A. Mottalib
  Abstract PDF
  AN EFFICIENT TOKEN BASED ALGORITHM FOR MUTUAL EXCLUSION IN DISTRIBUTED SYSTEM
  Fahim Kawsar, shadriful Hasan, Md. Shahariar Saikat, Md. Abdur Razzaque, M.A. Mottalib

  Abstract

  Many distributed computations involving the sharing of resources among various processesrequire that a resource be allocated to a single process at a time. Therefore, mutual exclusion is a fundamental problem in any distributed computing system. This problem must be solved to synchronize the access to shared resources in order to maintain their consistency and integrity. The major goal of this paper is to get the reader acquainted with a new approach towards the ring based technique for mutual exclusion in a distributed system. An algorithm is proposed based on the idea of generating token by the competing processes to enter the critical section and thus eliminating idle time message passing and reducing communication overhead.