I posted a topic, an academic research of ostomy bags, on 14th Nov. However, as it is written in Japanese, no one seems to be able to reply.
So, here I tell you the result which producer's ostomy bag is the best in terms of deodorization & venting. That is Convatec.
As soon as I read the article, I applied for the sample of Convatec's ostomy bags (two different types).
I will let you know after I try them comparing with Coloplast one.