DPOS seems to refer to completely two different things.
Firstly, there is BitShares' DPOS system which stands for "delegated proof of stake". This is the most common meaning of "DPOS" and is the one that most people probably think of and are referring to:
http://wiki.bitshares.org/index.php/DPOS_or_Delegated_Proof_of_Stake
Then there is also something called "dynamic POS" which OP mentioned. Dynamic proof of stake (also called DPOS) seems to be a variant of proof of stake used by the lesser known altcoins Positron and Isotope. I'm not sure how it differs from traditional POS but it looks like it involves stake rewards which change over time depending on which blocks are mined:
http://bitcointalk.org/index.php?topic=1021029
http://bitcointalk.org/index.php?topic=1039891
Firstly, there is BitShares' DPOS system which stands for "delegated proof of stake". This is the most common meaning of "DPOS" and is the one that most people probably think of and are referring to:
http://wiki.bitshares.org/index.php/DPOS_or_Delegated_Proof_of_Stake
Then there is also something called "dynamic POS" which OP mentioned. Dynamic proof of stake (also called DPOS) seems to be a variant of proof of stake used by the lesser known altcoins Positron and Isotope. I'm not sure how it differs from traditional POS but it looks like it involves stake rewards which change over time depending on which blocks are mined:
http://bitcointalk.org/index.php?topic=1021029
http://bitcointalk.org/index.php?topic=1039891
Interesting.
How many kinds of POS are there?
I just saw a coin in the altcoins mentioning vPOS...
Peercoin uses minting (which uses coin age), NXT uses transparent forging (where the next forger is known in advance), BitShares uses delegated proof of stake (DPoS) where 101 delegates are elected to process transactions, Reddcoin uses proof of stake velocity (POSV), and NEM uses proof of importance (POI) where factors other than just the size of your balance alone are also taken into account when determining staking probability.
There are probably others that I have missed but I think these are the major ones.