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The proliferation of GPS-enabled mobile devices has generated geo-tagged data at an unprecedented rate over the past decade. Data-processing systems that aim to ingest, store, index, and analyze Big Data must deal with such geo-tagged data efficiently. In this paper, among representative, disk-resident spatial indexing methods that have been adopted by major SQL and NoSQL systems, we implement five...
Informatization is the ultimate way out for audit method in China. In order to improve audit quality, the auditee's information system always needs to be restored on the auditors' environment by re-installing them. The kind of audit model brings great pressure to the auditors, not only is the heavy workload at each audit project, but also there is incompatibility problems between different operating...
AGG is a well established development environment which is used to model software systems in terms of graphs. Though AGG provides an appropriate basis for system modelling and verification, it can neither analyze nor evaluate the system reliability. In this paper, we propose an AGG-based strategy which, by combining generalized stochastic petri net (GSPN) and tools for reliability analysis, supports...
With the rapid development of sensor technologies, in nowadays various types of sensors are deployed around us as a basis to build a smart environment. It is without doubt that how to deal with the huge amount of data collected by various sensors in an efficient way and to transform these data to useful information for people to make use of has become an important research topic. The vast amount of...
In this paper, the cloud services optimization problem considering energy consumption cost is discussed. The queue model is presented for customer request service on data center. Since the server energy utility is based on the CPU core frequency, the novel trade-off optimization model between services revenue and energy loss cost is proposed in the paper, including allocating the dynamic CPU frequency...
Instant search is an emerging information-retrieval paradigm in which a system finds answers to a query instantly while a user types in keywords character-by-character. Fuzzy search further improves user search experiences by finding relevant answers with keywords similar to query keywords. A main computational challenge in this paradigm is the high-speed requirement, i.e., each query needs to be...
Architecture description languages (ADLs) play an important role in specifying the software architectures. While most of these ADLs are unable to deal with the change directly, especially for dynamic evolution of software systems. This paper proposes an XML-based ADL, named Breeze/ADL, which is supported by Breeze Graph Grammar (BGG) - a graph grammar we defined, to describe software architecture...
The Media Switch is an end-to-end total solution deployed in data center, broadband central offices, and customer premises. The Architecture is designed to fit the common WAN network hierarchy with high reliability and scalability. The systems that reside in the data center are Media Asset Management System, Media Acquisition Control System, Subscriber Management System, Billing System, Content Management...
TASTIER is a research project on the new information-access paradigm called type-ahead search, in which systems find answers to a keyword query on-the-fly as users type in the query. In this paper we study how to support fuzzy type-ahead search in TASTIER. Supporting fuzzy search is important when users have limited knowledge about the exact representation of the entities they are looking for, such...
The emphases of this study are Web log data preprocessing and collaborative filtering. Aiming at user session identification in the process of data preprocessing and analyzing existing algorithms, this paper established a Web log data preprocessing algorithm based on collaborative filtering. Detailed steps of algorithm and an experimental simulation were carried out. The results of the experiment...
Web service security is essential for SOA-based applications. Based on the analysis of the two existing authentications of REST-style Web services, Basic HTTP Authentication and HTTP Digest Authentication, we propose an extended UsernameToken-based approach for REST-style Web service. In this approach, the WS-Security UsernameToken and secondary password are added into the HTTP header. By this way,...
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