A new computational model that addresses the formation of both topography and ocular dominance is presented. This is motivated by experimental evidence that these phenomena may be subserved by the same mechanisms. An important aspect of this model is that ocular dominance segregation can occur when input activity is both distributed, and positively correlated between the eyes. This allows inves...

In his classic article, ‘‘Famine, Affluence, and Morality (Philosophy and Public Affairs 1 (1972), pp. 229–243),’’ Peter Singer claimed that affluent people in the developed world are morally obligated to transfer large amounts of resources to poor people in the developing world. For present purposes I will not call Singer’s argument into question. While people can reasonably disagree about exa...

Certain relationships generate associative duties that exhibit robustness across change. It seems insufficient for friendship, for example, if I am only disposed to fulfil duties of friendship towards you as things stand here and now. However, robustness is not required across all variations. Were you to become monstrously cruel towards me, we might expect that my duties of friendship towards y...

With the rapid development of network and the coming of information age, access control is particularly important, role-based access control (RBAC) is an access control which is popular. RBAC authorizes and controls the roles corresponding to the users to operate the object. It solves problems of least privilege, separation of duties and so on. However, limited permissions are required to be ex...