Browsing by Subject "Asynchronous communication"

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Open Access
A new wireless asynchronous data communications module for industrial applications
(2013) Ege, Y.; Şensoy, M.G.; Kalender O.; Nazlibilek, S.; Çitak H.
All the sensors such as temperature, humidity, and pressure used in industry provide analog outputs as inputs for their control units. Wireless transmission of the data has advantages on wired transmission such as USB port, parallel port and serial port and therefore has great importance for industrial applications. In this work, a new wireless asynchronous data communications module has been developed to send the earth magnetic field data around a ferromagnetic material detected by a KMZ51 AMR sensor. The transmitter module transmits the analog data obtained from a source to a computer environment where they are stored and then presented in a graphical form. In this design, an amplitude shift keying (ASK) transceiver working at the frequency of 433.92 MHz which is a frequency inside the so called Industrial Scientific Medical band (ISM band) used for wireless communications. The analog data first fed into a 10-bit ADC controlled by a PIC microcontroller and then the digital data is sent to the transmitter. A preamble bit string is added in front of the data bits and another bit string for achieving synchronization and determination the start of the data is used. The data arriving at the receiver is taken by the microcontroller and sent to a LCD display as well as the serial port of a computer where it is written in a text file. A Visual Basic based graphics interface is designed to receive, store and present the data in the form of graphical shapes. In the paper, all the work has been explained in detail. © 2013 Published by Elsevier Ltd. All rights reserved.
Open Access
Students' and teachers' attitudes towards the use of computer-mediated communication voice & text chat as an instructional resource to improve speaking skill
(2005) Aykaç, Müzeyyen
This study explored teacher and student attitudes towards use of computer mediated communication (CMC) in support of teaching speaking skills. Data were collected through the questionnaires distributed to 20 Tourism students and 60 English instructors at Muğla University and through interviews conducted with 12 CMC-experienced international EFL instructors. The questionnaire for students investigated students’ feelings about the four L2 skills generally, their computer use and their opinions about use of voice-text chat for developing speaking skills. The questionnaire for Mugla English instructors aimed to discover their personal background, computer background, attitudes about use of communication technology for teaching L2 and potential problems that they foresaw in using voice & text chat in their EFL instruction. The interviews with CMC-experienced international EFL teachers aimed to explore international English instructors’ perceptions about teaching speaking skills, use of voice chat as an instructional source for speaking instruction, and instructional advantages and disadvantages of voice chat. Findings gathered from students’ questionnaires revealed that students perceived speaking as the most important skill but had problems with both speaking itself and classes in speaking. Both sets of EFL teachers and students were positive in support of use of CMC in support of speaking instruction, although teacher responses indicated anticipation of some problems – fit to the curriculum, computer access, finding appropriate international partners – in implementing classroom CMC. All respondents indicated the need for appropriate training and administrative support to make the implementation of voice and text chat successful in the Tourism Department at Muğla University.