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In the Internet, the digital format of most contents has led to its increased piracy because of the ease of copying and sharing the digital contents. Moreover, the advent of new technologies such as ubiquitous computing seems to cause problems of piracy even more than before. Likewise it's going to be a more critical issue to control and manage rights of(More)
Proposed in this paper is the architecture of a PLC programming environment that enables a visual verification of PLC programs. The proposed architecture integrates a PLC program with a corresponding plant model, so that users can intuitively verify the PLC program in a 3D graphic environment. The plant model includes all manufacturing devices of a(More)
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