Volume: 1
Number: 1
January-June 2002

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

• CATALYTIC OXIDATION OF UNBURNED HYDROCARBON IN SIMULATED EXHAUST GAS OF DME ENGINE
  Mahabubul Alam, Shinichi Goto, Osamu Fujita, and Kenichi Ito
  Abstract PDF
  CATALYTIC OXIDATION OF UNBURNED HYDROCARBON IN SIMULATED EXHAUST GAS OF DME ENGINE
  Mahabubul Alam, Shinichi Goto, Osamu Fujita, and Kenichi Ito

  Abstract

  Characteristic of dimethyl ether (DME) oxidation with NOx reduction catalyst was investigated in comparison with noble metal catalyst. The catalysts used in this research were Co and Sn as NOx catalyst and Pt as a noble metal catalyst. In addition, pure alumina (denoted by “PA” in the following section) catalyst was also used. Laboratory experiments were conducted by using above catalysts in oxygen rich or Diesel type DME engine simulated exhaust gas. Catalyst temperature and concentration of NO were selected as experimental parameters. The experimental results showed that low temperature DME oxidation was possible with Pt whereas, higher temperature DME oxidation was observed with Co, Sn and PA catalyst. Large amount of formaldehyde (HCHO) was formed as an intermediate species during the use of NOx reduction catalysts. However, Pt catalyst did not show any formation of formaldehyde. The effect of concentration of reducing agent on NO reduction was also carried out with the NOx reduction catalyst.
• AN IMPROVED ALGORITHM FOR FINDING OUT THE PEG STATUS AT ANY MOVEMENT OF M-TH DISK OF THE TOWER OF HANOI
  SardarAnisul Haque, Md. Abdul Mottalib
  Abstract PDF
  AN IMPROVED ALGORITHM FOR FINDING OUT THE PEG STATUS AT ANY MOVEMENT OF M-TH DISK OF THE TOWER OF HANOI
  SardarAnisul Haque, Md. Abdul Mottalib

  Abstract

  Tower of Hanoi is a familiar puzzle used to show the principle of mathematical induction, the power of recursive algorithms etc. Its general solution is based on recursion method that can be defined generally as the method of solving a problem by dividing it into two or more sub problems, each of them are same like the original problem in nature, but smaller in size. This paper shows the status of all three pegs after each movement of any disk. It also computes the moves of a particular disk mathematically without solving all disks’ movement. Based on this mathematical analysis a new algorithm is devised here.
• MOBILE HANDOVER PROTOCOL FOR UMTS NETWORKS: A NEW APPROACH
  Md. Abdur Razzaque, Md. Mahbub Alam
  Abstract PDF
  MOBILE HANDOVER PROTOCOL FOR UMTS NETWORKS: A NEW APPROACH
  Md. Abdur Razzaque, Md. Mahbub Alam

  Abstract

  This paper deals with the mobile handover protocol in the Universal Mobile Telecommunication System (UMTS) in context of 3rd generation mobile communication system. A handover protocol for mobility management in between Satellite UMTS (S-UMTS) and Terrestrial UMTS (T-UMTS) networks has been proposed. The UMTS system architecture and some functional requirements are discussed, first. Then the proposed protocol has been introduced and explained with information flow diagrams for certain cases of internetwork handover. Further key functions required to perform efficient handover is discussed. The proposed protocol decreases the handover blocking probability by allowing T-UMTS Mobile Terminals (MT) to use S-UMTS network as a backup and thereby ensures smooth handover.
• DESIGN OF A COMPUTER AIDED PROCESS PLANNING TOOL (CAPP-S6) FOR SHAFT TYPE OBJECTS USING AUTO LISP AND C
  Md. NurulAbsar Chowdhury, Muhammad Muzam Hayat
  Abstract PDF
  DESIGN OF A COMPUTER AIDED PROCESS PLANNING TOOL (CAPP-S6) FOR SHAFT TYPE OBJECTS USING AUTO LISP AND C
  Md. NurulAbsar Chowdhury, Muhammad Muzam Hayat

  Abstract

  This paper deals with the Computer Aided Process Planning system for shaft type of objects. The system is designed using C and Auto LISP for the process planning of six different types of shafts. It is a combination of variant and automatic process planning. The system takes input from the user, generates drawing of the work piece, simulates, and generates process plan for each part. The input data are the dimensions and the material specifications of the shaft. Different types of materials can also be selected using this programme. The process plans can be saved and retrieved again. The system also generates part code according to the shape and dimensions of the work piece.
• E-COMMERCE: TECHNOLOGY AND ITS PERSPECTIVE IN THE DEVELOPING COUNTRIES
  Md. Saiful Islam, Shareeful Islam
  Abstract PDF
  E-COMMERCE: TECHNOLOGY AND ITS PERSPECTIVE IN THE DEVELOPING COUNTRIES
  Md. Saiful Islam, Shareeful Islam

  Abstract

  We have entered the new millennium with great hopes. As we enter the new millennium we can see that the world is very clearly shifting to a new era in terms of new speed of changes. Information Technology (IT) brings this new speed unknown to human history. This fast speed of changes will be touching all aspect of human life. IT and in particular e-commerce is playing the central role in transforming the old economy into the high-speed new economy. E-commerce has created a vast range of business opportunities for both firms and individuals from developing countries to market their products and services abroad, and earn foreign exchange for their countries. In this research paper an attempt is made to focus on the e-commerce technology, its prospects and identify the various barriers that exists for its proper development in the developing countries around the world.
• THE INTERNET AND LOTUS NOTES (Feature Article)
  M. Abdur Razzaque
  Abstract PDF
  THE INTERNET AND LOTUS NOTES (Feature Article)
  M. Abdur Razzaque

  Abstract

  The Internet is a very common word in today’s electronic world. In general, the Internet means a collection of TCP/IP (a communication protocol, Transmission Control Protocol/ Internet Protocol) based network of computers. Millions of computers around the world are connected to the Internet. The Internet domain is like another world with vast and unbounded space! Some people call the Internet as Cyberspace. The digital bits in the form of packets travel the Internet like cars running in the super fast highway. Due to fast information flow, the Internet is also called the Information Super Highway.
  Surfing the Internet has become a part of daily life activity We send and receive e-mail and browse the Internet web sites. In the morning we read the news from various news sites. When we become tired of surfing the net, we click the mouse to an audio site to listen music and relax. Internet has many functions: 1. Mail Services 2. FTP (File Transfer Protocol) 3 Online Chat 4. Web Site Browsing 5 Search Engines 6. Electronic Commerce (E-Commerce)
  Mail is the most important service of the Internet We communicate and exchange mails with friends, office mates and relatives around the world via the Internet.