关键词：传媒；内容供给；疫后复苏；政策支持

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关键词：全光网；骨干全光网；WDM；ROADM

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关键词：计量学；分级分类；数据安全；开放共享；数据管理

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关键词：数据产权化，共享交易，权益分配

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This paper considers an approach to identify previously undetected malicious clients in Internet Service Provider (ISP) networks by combining flow classification with a graph-based score propagation method. Our approach represents all HTTP communications between clients and servers as a weighted, near-bipartite graph, where the nodes correspond to the IP addresses of clients and servers while the links are their interconnections, weighted according to the output of a flow-based classifier. We employ a two-phase alternating score propagation algorithm on the graph to identify suspicious clients in a monitored network. Using a symmetrized weighted adjacency matrix as its input, we show that our algorithm is less vulnerable towards inflating the malicious scores of popular Web servers with high in-degrees compared to the normalization used in PageRank. Experimental results on a 4-hour network trace collected by a large Internet service provider showed that incorporating flow information into score propagation significantly improves the precision of the algorithm.

关键词：HTTP连接图；ISP网络；客户检测

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It is impossible to print glass directly from a melt, layer by layer. Glass is not only very sensitive to temperature gradients between different layers but also to the cooling process. To achieve a glass state the melt, has to be cooled rapidly to avoid crystallization of the material and then annealed to remove cooling induced stress. In 3D-printing of glass the objects are shaped at room temperature and then fired. The material properties of the final objects are crucially dependent on the frit size of the glass powder used during shaping, the chemical formula of the binder and the firing procedure. For frit sizes below 250 μm, we seem to find a constant volume of pores of less than 5%. Decreasing frit size leads to an increase in the number of pores which then leads to an increase of opacity. The two different binders, 2-hydroxyethyl cellulose and carboxymethylcellulose sodium salt, generate very different porosities. The porosity of samples with 2-hydroxyethyl cellulose is similar to frit-only samples, whereas carboxymethylcellulose sodium salt creates a glass foam. The surface finish is determined by the material the glass comes into contact with during firing. 

关键词：3D印刷玻璃；印刷过程；表面光洁度

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Datacenter topology design is a complex problem with a huge search space. Recent work on systematic solution space exploration points out a significant problem on cabling: how to map a logical topology with servers, switches, and links onto a physical space with racks and cable trays such that the cable costs are minimized? In this paper, we show that this problem is NP-hard and present partitioning-based heuristics. Evaluation with different topologies demonstrate that our approach discovers better layouts than the previous approaches and reduces the cabling costs by up to 38%.

关键词：算法设计；数据分析；数据库

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Graphs are widespread data structures used to model a wide variety of problems. The sheer amount of data to be processed has prompted the creation of a myriad of systems that help us cope with massive scale graphs. The pressure to deliver fast responses to queries on the graph is higher than ever before, as it is demanded by many applications (e.g. online recommendations, auctions, terrorism protection, etc.). In addition, graphs change continuously (so do the real world entities that typically represent). Systems must be ready for both: near real-time and dynamic masive graphs. We survey systems taking their scalability, real-time potential and capability to support dynamic changes to the graph as driving guidelines. The main techniques and limitations are distilled and categorised. The algorithms run on top of graph systems are not ready for prime time dynamism either. Therefore, a short overview on dynamic graph algorithms has also been included. 

关键词：实时分析；大规模动态图；系统分析

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Reading online content for educational, learning, training or recreational purposes has become a very popular activity. While reading, people may have difficulty understanding a passage or wish to learn more about the topics covered by it, hence they may naturally seek additional or supplementary resources for the particular passage. These resources should be close to the passage both in terms of the subject matter and the reading level. However, using a search engine to find such resources interrupts the reading flow. It is also an inefficient, trial-and-error process because existing web search and recommendation systems do not support large queries, they do not understand semantic topics, and they do not take into account the reading level of the original document a person is reading. In this paper, we present LearningAssistant, a novel system that enables online reading material to be smoothly enriched with additional resources that can supplement or explain any passage from the original material for a reader on demand. The system facilitates the learning process by recommending learning resources (documents, videos, etc) for selected text passages of any length. The recommended resources are ranked based on two criteria (a) how they match the different topics covered within the selected passage, and (b) the reading level of the original text where the selected passage comes from. User feedback from students who use our system in two real pilots, one with a high school and one with a university, for their courses suggest that our system is promising and effective. 

关键词：学习资源；推荐系统；阅读器

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Server hardware is about to drastically change. As typified by emerging hardware such as UC Berkeley's Firebox project and by Intel's Rack-Scale Architecture (RSA), next generation servers will have \emph{thousands of cores}, \emph{large DRAM}, and \emph{huge NVRAM}. We analyze the characteristics of these machines and find that no existing database is appropriate. Hence, we are developing \texttt{FOEDUS}, an open-source, from-scratch database engine whose architecture is drastically different from traditional databases. It extends in-memory database technologies to further scale up and also allows transactions to efficiently manipulate data pages in both DRAM and NVRAM.

关键词：数据库引擎；服务器；燃烧室

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