Signo is a website devoted to Applied Semiotic Theories. The study of Signs, Semiotics is the primary purpose of this site and explains various semiotic theories.
A. Scherp, and R. Jain. MS '07: Workshop on multimedia information retrieval on The many faces of multimedia semantics, page 3--12. New York, NY, USA, ACM Press, (2007)
C. Saathoff, and S. Staab. 9th International Workshop on Image Analysis for Multimedia Interactive Services (WIAMIS 2008), page 16-19. Los Alamitos, CA, USA, IEEE Computer Society, (2008)
S. Dasiopoulou, J. Heinecke, C. Saathoff, and M. Strintzis. ICSC '07: Proceedings of the International Conference on Semantic Computing, page 413--420. Washington, DC, USA, IEEE Computer Society, (2007)