Distributed Coordination Function is the crucial component of IEEE 802.11 standard and has been examined over the past years. We extended the Markov Model to formulate the delay characteristic of the network. Our approach is unique in terms of finding the probability mass function of the time interval between successful transmissions of a station. These results are essential for predicting the ...

recently, hardware sensors are widely used in monitoring and measurement of water quality parameters. constraint of the instrument to measure some water quality parameters such as the 5-day biochemical oxygen demand (bod5), which are time consuming, causes efforts are diverted to the use of software sensors for online prediction of bod5. the main goal of this research is developing an appropria...

background and purpose: heart disease death rates have increased worldwide.family-oriented empowerment model improves the quality of life in the patients with chronic diseases. this study aims to determine the effect of family-oriented empowerment model on the life quality of the patients undergoing coronary artery bypass graft. methods: a quasi-experimental study was performed on the patients ...

this paper analyses and compares the performances of business-to-business e-commerce data quality and service quality among the use of the ‘push’ and ‘pull’ models. rosettanet’s original partner interface processes use the ‘push’ model which suffers from data redundancy when the volume of business-to-business transaction increases. however, when the ‘pull’ model is used, although it reduces dat...

objective: to investigate the application of quality function deployment (qfd) in the central library reference service quality science.methodology / approach: this study was a descriptive survey research and application. research instrument, libqual questionnaire and interview. the three-stage qfd model and the concentration of 7-seater model were used to determine the correlation matrix. the ...