Now it’s 16:00. It seems today has passed, and half of this week has passed. I am not productive at all. In my mind, I have lots of things to do, and to worry. First of all, I need to continue researching on location paper, and to study category theory knowledge. Any of them can take all my time. However, I have no spirit for working now. I began disliking myself. Such a stupid, lazy woman!
I also worry about my phd work. I always feel uncertainty about my future. I donot know what I am doing is on the way. I donot know where I will reach.
I have worked on contextual models, but even I can not count how many models are popular now, and what proplem they have. However, I may know some, at least ORM by Henricken, and ontologies, while I donot know where I should put my work in.
I have worked on category theory, but I donot know how category theory is applied. I have read some papers about applying category theory in conceptual data model, but I got lost in mathematical definition and proof. I read some categorical books, but the speed I forgot is quicker than that I read 
I have worked on applying lattice to uncertainty prolems in location models. I donot really grasp the spirit of lattice, and donot know how to define meaningful join and meet operations.
I have worked on buidling location ontologies, but I donot know where my work is, how I compare my work with others’, and how I implement location ontologies.
All the above are what I have done in the temporal sequence. In each part, I only know little, and leave the key problems unsolved.
Anyway, this may be a phd’s life: always worried, busy, and afraid……
