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Particulate matter pollution becomes an increasingly important problem in developing countries and poses a hazard to human health especially in indoor environment. At the same time, modern buildings are equipped with advanced sensing and control technologies, offering control and optimization capabilities over a large range of parameters. This paper proposes an open platform of a WiFi-enabled indoor...
This paper describes a database system with tenant technology on Eucalyptus platform for a rural drinking water supply system. This database use a sharing model to store data and a tenant placement algorithm to properly put tenants in virtual machine therefore it can ensure the service quality for the tenants with the minimum use of hardware resources. The experiment results show that the tenant placement...
With the security situation in Cyberspace constantly becoming worse, Cyber threat detection has attracted a lot of researching attentions. In this paper, existing detection technologies are firstly reviewed. Secondly, a framework of capturing the abnormal traffic of botnets is proposed. Major modules and key detection techniques are presented at the same time. The hidden threat detection in physically...
Cloud Map-Reduce (CMR) is an advantage Map-Reduce platform and has been aroused more and more attention. To further balance the performance of job secluding among job cost, execution time and energy consumption, a locality-aware and energy-aware job pre-assignment algorithm is proposed for Map-Reduce of CMR in this paper. Firstly, the importance of rack in data locality and energy saving is analyzed...
Deduplication technology has been increasingly used to reduce the primary storage cost. In practice, it often causes additional on-disk fragmentation that impairs the reading performance. Existing deduplication algorithms mainly focus on the static data layout design so that the random I/O requests are largely avoided and the harmful effect can be alleviated. However, our trace-driven emulations show...
To solve the contradiction between massive network information and limited learning needs, personalized recommendation service becomes the hotspot in research area. User characteristics analysis is the key point in personalized recommendation service. Based on the massive web access log in the web server, this research gradually puts forward the steps of user characteristics analysis which including...
Smart electricity Standardization was the current outstanding problems that the smart grid was facing. Significance and principle of smart grid user interface testing platform standardized testing were analyzed, contents of the system architecture, communications networking, implement programs were put forward, highlights were platform architecture, design and typical applications. Finally, a summary...
The Hadoop framework has gained significant attention from the scientific community due to its applicability to large-scale data analysis in many areas. This analysis often involves multiple stages of processing, which in turn, constitutes a workflow. While some stages of a workflow are mandatory, others are subject to the type of analysis to be done. In addition, a workflow may possess data dependencies...
Deduplication technology has been increasingly used to reduce the storage cost. In practice, it often causes additional on-disk fragments that impair the reading performance. To reduce the impact of fragments, traditional thought of defragmentation that reallocating files on-disk to achieve contiguous layout has been widely used in many operating systems. Unfortunately, file defragmentation is highly...
The improvement of file access performance is a great challenge in real-time cloud services. In this paper, we analyze preconditions of dealing with this problem considering the aspects of requirements, hardware, software, and network environments in the cloud. Then we describe the design and implementation of a novel distributed layered cache system built on the top of the Hadoop Distributed File...
Cloud computing has now become the largest hearing field and question in IT industry and each industry join in the development of cloud. This article studies the popular cloud platforms and cloud services on the basis of three types of cloud services, introduces the Google's cloud computing technology — GFS, MapReduce, Bigtable which has the most application prospects. And it analysis the application...
Service flow in SOA systems need to detect quality of service (QoS) problems and to guarantee end-to-end performance. In previous work, we have proposed two faulty service identification methods: a dependency matrix based diagnosis and a Bayesian network based diagnosis. In this paper, we present a hybrid diagnosis to achieve high diagnosis accuracy and low diagnosis cost. The hybrid diagnosis reduces...
With the rapid development of electronic and computing technology, a growing number of new applications in the area of 3D video have come into sight, including the popular interactive 3D service. In this paper, the system architecture of a user-driven interactive 3D video streaming transmission is presented, which is simple to be realized with legacy displays. In particular, a novel idea is proposed,...
According to requirements, a solution of remote PLC experiment system has been introduced, including total architecture, hardware and software design. We made a remote experiment in order to control simple mechanical equipment with S7–200 PLC. Then through CP243-1IT, mechanism, PLC, server and clients from internet are mutually connected. By visiting lab web and operating panel of console interface,...
Water environmental problems of river basins in china are becoming more and more serious. Whereas, the environmental watchdogs at different levels provide comparatively independent water environmental data and use various kinds of data patterns, which makes it difficult to resolve the problems in a comprehensive way and make a unanimous decision as to how to deal with the worsening water environment...
Spatial database information stores with vector form in Geographic information system based on Web (WebGIS), relational database information stores with two dimension form, they are not to convert for each other directly, and to lead to universal is weak, availability of spatial data is low. In order to solve this problem, this paper proposes a way which uses XML as the middle carrier to achieve data...
In this paper, we study the algorithms to estimate the response times of service executions during real-time service composition. By using reservation schedules to derive server utilization, we can compute a more realistic response time for each service than its static execution time. Reservation schedules are kept in a system data structure called hierarchical TBTree (hTBTree). Using these response...
Spatial information processing is one of the important research contents in information technology. It is the major direction to combine geo-information technique and mobile communication technique in the spatial information processing. In this paper, we have thoroughly analyzed supporting techniques of mobile smart terminal spatial information processing system based on the spatial information's...
WPS (web processing service) is the specifications launched by OGC organizations for dealing with space data, which is different from the conventional Web Service. There aren't dedicated workflow environment for WPS service framework, and support of workflow environments in WPS application is the key technical challenges. Some of the workflow environment, such as Shark, still lack of effective implementation...
A major issue in the resource allocation problem, also known as the data and service allocation problem, in a networked organization is the key problem in Web services distribution. A detailed investigation is carried out of the resource allocation model of allocating data and application services across a distributed networking system. The data and application service allocation problem is modeled...
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