Volume: 7
Number: 1
June 2009

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

• Development of SS7 and IP Based SIGTRAN data exchanger software operated with designed USB E1 card
  M. S. Munir, K. Ahmed, Md. Shahriar Rahman, Md. Saifur Rahman and M. A. Hoque
  Abstract PDF
  Development of SS7 and IP Based SIGTRAN data exchanger software operated with designed USB E1 card
  M. S. Munir, K. Ahmed, Md. Shahriar Rahman, Md. Saifur Rahman and M. A. Hoque

  Abstract

  This paper presents new software, which can exchange signaling channel data between SS7 and IP based SIGTRAN network using our developed E1 card. Currently packet data is becoming more significant proportion of traffic in communication network compared to voice. So it has become essential to find ways to consolidate voice, data traffic, platforms and services to reduce the operational, maintenance and initial cost of the network. SIGTRAN network is now considered the most promising media on which to build the new integrated services platform which is basically SS7 in the IP packet. For this reason, development of SS7 and SIGTRAN data exchanger has become a very crucial point. In this paper, we have presented a new software and related hardware to perform this data exchange. The software takes SS7 signaling data from our developed USB E1 card for exchanging with SIGTRAN data of Ethernet port. The unique feature of the E1 card is its USB operation which makes the device plug and play. Another crucial point is that the total development cost of the hardware is minute compared to other hardware in the market. For SS7 and SIGTRAN protocol configuration, ITU-T and IETF standards are followed. This makes the data exchanger software format globally acceptable.
• Job Satisfaction of the Government Polytechnic Teachers in Bangladesh: A Gender Analysis
  Shamim Ahmed, Md. Shahjahan Mian Tapan and Muhammad Mahmood Javaid
  Abstract PDF
  Job Satisfaction of the Government Polytechnic Teachers in Bangladesh: A Gender Analysis
  Shamim Ahmed, Md. Shahjahan Mian Tapan and Muhammad Mahmood Javaid

  Abstract

  Teachers’ job satisfaction can play important role to improve the quality of education. The purpose of the present study was to identify and compare the level of job satisfaction between male and female polytechnic teachers in Bangladesh and to see what the main factors are for job satisfaction. Due to some constraints teachers of 8 out of 43 polytechnic institutions were considered as sample for the study. A comprehensive questionnaire was mailed to these institutions and in some cases the researcher himself collected data. The responses were analyzed and interpreted by using t-test. Significant differences were found between opinions of male and female teachers for factors: salary, promotion, facilities provided by the government, honor and social status but overall male and female teachers are dissatisfied with their jobs and the level did not differ significantly. From the study, the researcher recommended that teachers’ salary structure should be reviewed so that their basic needs can be fulfilled as also teaching load should be reduced to a satisfactory level. Teachers should be promoted in time and there must be provision for teachers to go for higher studies.
• Performance Analysis of Cooperative Relaying in Nakagami-m Fading Channels
  B. Barua and M. Z. I. Sarkar
  Abstract PDF
  Performance Analysis of Cooperative Relaying in Nakagami-m Fading Channels
  B. Barua and M. Z. I. Sarkar

  Abstract

  This paper is concerned with the analysis of exact Symbol Error Probability (SEP) for cooperative diversity using Amplify-and-Forward (AF) relaying over independent and non-identical Nakagami-m fading channels. The mathematical formulations for Probability Density Function (PDF) and Moment Generating Function (MGF) of a cooperative link have been derived for calculating Symbol Error Probability with well-known MGF based approach taking M-ary Phase Shift Keying (MPSK) signals as input. The numerical results obtained from the proposed mathematical formulations have been compared with different fading conditions. It is observed that the existence of the diversity link in a relay network plays a dominating role in error performance.
• Prospect of Jatropha Curcas and Pithraj Cultivation in Bangladesh
  Md. Nurun Nabi, S. M. Najmul Hoque and Md. Shazib Uddin
  Abstract PDF
  Prospect of Jatropha Curcas and Pithraj Cultivation in Bangladesh
  Md. Nurun Nabi, S. M. Najmul Hoque and Md. Shazib Uddin

  Abstract

  This work investigates the prospect of Jatropha (Jatropha Curcas) and Pithraj (aphanamixis polystachya) plantation in Bangladesh and making of Bio-diesel from their seeds. Jatropha and Pithraj are the renewable and non-edible. They are wildly growing hardy plant, in arid and semi-arid regions of the country on degraded soils having low fertility and moisture. There is a huge unused amount of area about 0.32 million hectares in Bangladesh where Jatropha Curcas and Pithraj can be cultivated successfully. Jatropha and Pithraj oil is an important product from the plant for meeting the demand of diesel in Bangladesh. Around 2500 Jatropha tree can be planted in one hectare and around 300 Pithraj tree can be planted in one hectare. The seeds of Jatropha Curcas contain 30-40% oil. The seeds of Pithraj contain 30-35% oil .The oil can be converted to Bio-diesel by the well-known transesterification process. If Jatropha Curcas plantation is successful in 0.32 million hectare land, the amount of Bio-diesel production will be 0.58 million ton per year. Bangladesh imports approximately 2.4 million ton diesel each year. By planting of Jatropha Curcas, Bangladesh can reduce importing a huge amount (25%) of petroleum products from foreign countries. Bio-diesel from Jatropha could be blended by 20 per cent with the normal diesel. Similarly if Pithraj plantation is successful in 0.32 million hectare land, the amount of Bio-diesel production will be 0.50 million ton per year. By planting of Pithraj, Bangladesh can also reduce importing 21% of petroleum products. Pithraj could be blended by 20 per cent with the normal diesel.