We consider a multitype population model with unobservable types, in which players are engaged in the ‘mutual help’game: each player can increase her partner’s …tness at a cost to oneself. All individuals prefer free riding to cooperation, but some of them, helpers, can establish reciprocal cooperation in a long-term relationship. Such heterogeneity can drive cooperation through a partner selec...

Exploring and monitoring the underwater world using underwater sensors is drawing a lot of attention these days. In this field cooperation between acoustic sensor nodes has been a critical problem due to the challenging features such as acoustic channel failure (sound signal), long propagation delay of acoustic signal, limited bandwidth and loss of connectivity. There are several proposed metho...

An increasing body of empirical evidence suggests that cooperation among clone-mates is common in bacteria. Bacterial cooperation may take the form of the excretion of "public goods": exoproducts such as virulence factors, exoenzymes or components of the matrix in biofilms, to yield significant benefit for individuals joining in the common effort of producing them. Supposedly in order to spare ...

Cooperating with others often entails some sacrifice of one's own material interests. Many theories of reciprocity and cooperation thus assert a social-material tradeoff. In these theories, people reciprocate cooperation when they prioritize how they treat others and how others treat them. They do not reciprocate cooperation when they prioritize their own material well-being. We challenge this ...

As social agents, humans continually interact with the people around them. Here, motor cooperation was investigated using a paradigm in which pairs of participants, one being scanned with fMRI, jointly controlled a visually presented object with joystick movements. The object oscillated dynamically along two dimensions, color and width of gratings, corresponding to the two cardinal directions o...

Protectionism against economic globalization (free trade and FDI) always surges in the financial crises as the pressure from unemployment mounts. This paper aims to assess the rationality of the protectionism. Instead of analyzing from the pure economic efficiency perspective, this paper assesses the rationality of protectionism from the political relation perspective. By building a costly sign...

Cooperative communication provides transmit diversity, even when, due to size constraints, mobile units cannot accommodate multiple antennas. A versatile cooperation method called coded cooperation has been developed, in which cooperation is implemented through channel coding with a view to controlling the errors inherent in wireless communication. In this work we evaluate the performance of co...

According to the cooperation reception strategy and the hybrid optimization, an interference alignment algorithm is proposed. The algorithm can minimize leakage interference and maximize ideal receiption signal power. Firstly, according to the receiver cooperation technology, the pre-coding vectors of transmitter terminal can be estimated by receiver terminal, where these vectors need not be kn...