Subjects: Biology >> Botany >> Applied botany submitted time 2020-11-27 Cooperative journals: 《广西植物》
Abstract：该研究对采自于我国的200 余份赤星衣属(Haematomma)地衣标本利用形态学、化学、生态学等特征进行了综合研究，发现赤星衣属一新种和一中国新记录种。新种为砖壁赤星衣(Haematomma muriformis)，主要特征为子囊盘红色，孢子砖壁型，较宽(75~87.5×12.5~20 μm)，所含化学物质为atranorin、haematommone 和arthothelin。中国新记录种为马托赤星衣(Haematomma matogrossense)。该文对新种和中国新记录种进行了详细的特征描述，提供了形态和解剖照片，同时提供了已知中国赤星衣属地衣物种的检索表。该研究充实了赤星衣属地衣的数据信息资源库，为《中国地衣志》的编写提供了基础资料。
Subjects: Computer Science >> Integration Theory of Computer Science submitted time 2019-05-10 Cooperative journals: 《计算机应用研究》
Abstract： Aiming at the properties of direction and diversity of social relationships in the social networks, this paper proposed a clustering algorithm of social networks based on graph clustering and ant colony optimization algorithm. Firstly, it constructed a directed and non fully connected complete graph for the social networks under constraint condition of network coverage; then, it adopted K-medoids algorithm to search the center users of all user groups, and it adopted ant colony optimization to search the similarities of each user and center users in the graph, it grouped the users satisfied the threshold condition into the same group. This paper also designed a prediction mechanism of low active degree users to resolve the sparsity problem and cold-start problem, besides, the network coverage constraint condition was set to balance the indexes of accuracy and coverage. Simulation experimental results indicate that the proposed algorithm realizes a good clustering performance of social networks, and it reduces the problems of sparsity and cold-start effectively.
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