The Fourth IEEE Workshop on Software Technologies for Future Embedded and Ubiquitous Systems SEUS 2006 and The second International Workshop on Collaborative Computing, Integration and Assurance : WCCIA 2006 : proceedings : 27-28 April 2006, Gyeongju, Korea / edited by Daeyoung Kim ... [et al.]. ; co-sponsored by IEEE Computer Society Technical Committee on Distributed Processing ... [et al.] ; in cooperation with OMG ... [et al.]. SEUS 2006 and The second International Workshop on Collaborative Computing, Integration and Assurance : WCCIA 2006 : proceedings : 27-28 April 2006, Gyeongju, Korea /