Libo Li will speak on "Enlargement of Filtration, Construction of Random Times and Semimartingale Decompositions" Abstract: We will firstly give an overview of the study of enlargement of filtration and introduce a method of constructing random times with a given Azéma’s supermartingale. Secondly, independent from the construction, we introduce a new class of random times, which can be seem as an extension to honest times. Lastly, we give results on decompositions of semimartingales in some enlarged filtration associated with this new class of random times. Financial motivation for this study includes reduced form credit risk models, market model of credit default swaps and perhaps insider trading. Everyone is cordially invited.