A large semantic gap exists between content based index retrieval(CBIR) and high-level semantic,additional semantic information should be attached to the images,it refers in three respects including semantic represent...A large semantic gap exists between content based index retrieval(CBIR) and high-level semantic,additional semantic information should be attached to the images,it refers in three respects including semantic representation model,semantic information building and semantic retrieval techniques.In this paper,we introduce an associated semantic network and an automatic semantic annotation system.In the system,a semantic network model is employed as the semantic representation model,it uses semantic Key words,linguistic ontology and low-level features in semantic similarity calculating.Through several times of users' relevance feedback,semantic network is enriched automatically.To speed up the growth of semantic network and get a balance annotation,semantic seeds and semantic loners are employed especially.展开更多
Thomas Hobbes(1588-1679)put forward"state of nature",a term of political theory which had completely changed the Western political philosophy. Deeply influenced by this concept, Daniel Defoe(1660-1731) showe...Thomas Hobbes(1588-1679)put forward"state of nature",a term of political theory which had completely changed the Western political philosophy. Deeply influenced by this concept, Daniel Defoe(1660-1731) showed us an island of the state of nature in his Robinson Crusoe. A print of man's foot on the sand, which evoked Robinson's fear, had become a symbol of the state of nature for Robinson's life on the island, and finally brought him a"state of war".展开更多
The phenomena of cooperation in animal and human society are ubiquitous, but the selfish outcome that no player contributes to the public good will lead to the "tragedy of the commons". The recent research s...The phenomena of cooperation in animal and human society are ubiquitous, but the selfish outcome that no player contributes to the public good will lead to the "tragedy of the commons". The recent research shows that high punishment can improve the cooperation of the population. In this paper, we introduce a punishment mechanism into spatial voluntary public goods games with every individual only knowing his own payoff in each round. Using the self-adjusting rules, we find that the different cost for punishment can lead to different effects on the voluntary public goods games. Especially, when the cost for punishment is decreased, a higher contribution region will appear in the case of low r value. It means even for the low r value, individuals can form the contributing groups in large quantities to produce a more efficient outcome than that in moderate r value. In addition, we also find the players' memory can have effects on the average outcome of the population.展开更多
文摘A large semantic gap exists between content based index retrieval(CBIR) and high-level semantic,additional semantic information should be attached to the images,it refers in three respects including semantic representation model,semantic information building and semantic retrieval techniques.In this paper,we introduce an associated semantic network and an automatic semantic annotation system.In the system,a semantic network model is employed as the semantic representation model,it uses semantic Key words,linguistic ontology and low-level features in semantic similarity calculating.Through several times of users' relevance feedback,semantic network is enriched automatically.To speed up the growth of semantic network and get a balance annotation,semantic seeds and semantic loners are employed especially.
文摘Thomas Hobbes(1588-1679)put forward"state of nature",a term of political theory which had completely changed the Western political philosophy. Deeply influenced by this concept, Daniel Defoe(1660-1731) showed us an island of the state of nature in his Robinson Crusoe. A print of man's foot on the sand, which evoked Robinson's fear, had become a symbol of the state of nature for Robinson's life on the island, and finally brought him a"state of war".
基金Supported by National High Technology Research and Development Program of China(863 program/2009AA043703)National Natural Science Foundation of China under Grant No.91023045+1 种基金the Center for Asia Studies of Nankai University under Grant No.AS1005Tianjin City High School Science&Technology Fund Planning Project under Grant No.20100908
文摘The phenomena of cooperation in animal and human society are ubiquitous, but the selfish outcome that no player contributes to the public good will lead to the "tragedy of the commons". The recent research shows that high punishment can improve the cooperation of the population. In this paper, we introduce a punishment mechanism into spatial voluntary public goods games with every individual only knowing his own payoff in each round. Using the self-adjusting rules, we find that the different cost for punishment can lead to different effects on the voluntary public goods games. Especially, when the cost for punishment is decreased, a higher contribution region will appear in the case of low r value. It means even for the low r value, individuals can form the contributing groups in large quantities to produce a more efficient outcome than that in moderate r value. In addition, we also find the players' memory can have effects on the average outcome of the population.
