The inherent selfishness of each node for the enhancement of message successful delivery ratio and the network overall performance improvement are reflected in the contradiction relationship of competition and coopera...The inherent selfishness of each node for the enhancement of message successful delivery ratio and the network overall performance improvement are reflected in the contradiction relationship of competition and cooperation in delay/disruption tolerant networks (DTN). In particular, the existence of malicious node aggravates this contradiction. To resolve this contradiction, social relationship theory and group theory of social psychology were adopted to do an in-depth analysis. The concrete balancing approach which leveraged Nash equilibrium theory of game theory was proposed to resolve this contradiction in reality. Thus, a new congestion control routing algorithm for security defense based on social psychology and game theory (CRSG) was put forward. Through the experiment, this algorithm proves that it can enhance the message successful delivery ratio by more than 15% and reduce the congestion ratio over 15% as well. This algorithm balances the contradiction relationship between the two key performance targets and made all nodes exhibit strong cooperation relationship in DTN.展开更多
The Church of Kidane Mehret stands at 2,450 m above sea level, close to the village of Sen＇afe, on the border between Ethiopia and Eritrea. Probably built in the fifteenth or sixteenth century, the church gradually b...The Church of Kidane Mehret stands at 2,450 m above sea level, close to the village of Sen＇afe, on the border between Ethiopia and Eritrea. Probably built in the fifteenth or sixteenth century, the church gradually became a ruin in the middle of the last century. Following the intervention of the monks of this church, a restoration program was set up in 2006. With the agreement of the National Museum in Asmara and the World Monuments Fund, funding was collected together by the German Embassy, the French Embassy, and the Alliance Fran^aise of Asmara, which made it possible to restore the church, between 2006 and 2008. Teams of workmen and women were created to this end. Only traditional techniques were employed for the masonry of the walls, the wooden roofing the plastering, and the interior paintwork. This project, which conforms to the Charter of Venice, could serve as an example for similar restorations in the region and as a model for professional training. Finally, a trilingual article （English, German, and Tigrinya） was published in the Collection ＂Cultures et Patrimoines d＇ErythrGe＂, 2009.展开更多
基金Projects(61202488, 61070199, 61103182) supported by the National Natural Science Foundation of China
文摘The inherent selfishness of each node for the enhancement of message successful delivery ratio and the network overall performance improvement are reflected in the contradiction relationship of competition and cooperation in delay/disruption tolerant networks (DTN). In particular, the existence of malicious node aggravates this contradiction. To resolve this contradiction, social relationship theory and group theory of social psychology were adopted to do an in-depth analysis. The concrete balancing approach which leveraged Nash equilibrium theory of game theory was proposed to resolve this contradiction in reality. Thus, a new congestion control routing algorithm for security defense based on social psychology and game theory (CRSG) was put forward. Through the experiment, this algorithm proves that it can enhance the message successful delivery ratio by more than 15% and reduce the congestion ratio over 15% as well. This algorithm balances the contradiction relationship between the two key performance targets and made all nodes exhibit strong cooperation relationship in DTN.
文摘The Church of Kidane Mehret stands at 2,450 m above sea level, close to the village of Sen＇afe, on the border between Ethiopia and Eritrea. Probably built in the fifteenth or sixteenth century, the church gradually became a ruin in the middle of the last century. Following the intervention of the monks of this church, a restoration program was set up in 2006. With the agreement of the National Museum in Asmara and the World Monuments Fund, funding was collected together by the German Embassy, the French Embassy, and the Alliance Fran^aise of Asmara, which made it possible to restore the church, between 2006 and 2008. Teams of workmen and women were created to this end. Only traditional techniques were employed for the masonry of the walls, the wooden roofing the plastering, and the interior paintwork. This project, which conforms to the Charter of Venice, could serve as an example for similar restorations in the region and as a model for professional training. Finally, a trilingual article （English, German, and Tigrinya） was published in the Collection ＂Cultures et Patrimoines d＇ErythrGe＂, 2009.
