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مجله برنامه های کاربردی شبکه و کامپیوتر
جزئیات رویداد
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  • a framework for collaborative remote experimentation for a physical laboratory using a low cost embedded web server

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 769
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    • شماره تماس دبیرخانه رویداد: -
     a tcp/ip-based scientific instrument control and data distribution system have been designed and realized as part of a low cost e-learning strategy to allow an institution of learning to offer remote access to a distant, physical laboratory for collaborative experimentation using a highly embedded web server. in principle a single experimental setup in the remote laboratory can be monitored and logged simultaneously by any number of permitted clients through a simple, custom web browser interface. the system features an ieee 802.3 compliant full-duplex medium access controller (mac) and physical layer device connected to actuators and measurement transducers for control, data acquisition, distribution and logging over a local high-speed tcp/ip network. the designed system differs in its approach from most contemporary approaches in that it specifies circuit level components required to set up a low cost collaborative remote experimentation server. the system hardware comprises a server made up of a pic18f2620 and enc28j60 and client pc terminals interconnected through a network hub. the software comprises the firmware, written in c and javascript, and a simple client web browser written in the visual basic.net framework. this custom client browser approach circumvents the restrictions that standard client browsers place on direct file system access while optimizing data acquisition and transport while better handling several exception scenarios and implementing an authentication mechanism for secure client access. the system suggests a simplified external rom-based client authentication solution to the problem of embedded system security that is of growing global concern. the figures of merit of the system, such as the round-trip times and the inter-sample times, are determined. finally, typical data outputs of two networked pcs in a collaborative monitoring of temperatures in newton’s law of cooling experiment are presented.

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