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LSM-tree has been widely used in data management production systems for write-intensive workloads. However, as read and write workloads co-exist under LSM-tree, data accesses can experience long latency and low throughput due to the interferences to buffer caching from the compaction, a major and frequent operation in LSM-tree. After a compaction, the existing data blocks are reorganized and written...
Traditionally, network storage systems have mainly been dominated by two IP-based storage technologies, i.e., Network Attached Storage (NAS) and Storage Area Network (SAN). In recent years, cloud based storage (e.g., Amazon S3) has gained growing popularity for its high flexibility and cross-platform compatibility. Many enterprises are considering to replace traditional storage systems with cloud-based...
Softwares usually need to be updated to fix bugs or add new features. On the other hand, some critical softwares, such as cloud applications, need to provide service continuously, thus should be updated without downtime. Conventional Dynamic Software Updating (DSU) systems try to update programs while running, but they hardly consider the communication of the program to be updated with other programs,...
Cloud storage is receiving high interest in both academia and industry. As a new storage model, it provides many attractive features, such as high availability, resilience, and cost efficiency. Yet, cloud storage also brings many new challenges. In particular, it widens the already-significant semantic gap between applications, which generate data, and storage systems, which manage data. This widening...
Flood disaster refers to a short-term or continuous heavy rainfall, and forecasting flood disaster accurately is of great importance in human life. Therefore, in this paper, we present a novel intelligent multi-agent approach for flood disaster forecasting based on case based reasoning. Firstly, the proposed framework is constructed by three main modules, which are "Front end user computer",...
Many remote laboratory setups include a webcam for users to observe the equipment in action. However, naïve users do not get a clear picture of what might be happening inside the equipment. This paper presents one attempt made to address this issue, using an animation to provide an exploded view of the equipment and to drive this animation with data streamed in real-time from the equipment. This is...
In this paper, based on the DDNS(Dynamic Domain Name Service) and port mapping technology, a method about server port mapping and server-side gateway dynamic DNS is introduced, which can be applied in Data Collecting System based on the Internet of Things. In this way, the external sensor-side gateway can access the intranet server which has a dynamic IP address.
According to the circulation process of financial indicators flow, data flow, capital flow involved in financial supervision work, based on the financial data center, designs a five-story architecture for the system including monitoring and analysis of budget preparation, monitoring and analysis of budget adjustments, monitoring and analysis of budget implementation, monitoring and analysis of accounts...
Under a replacement policy, existing operating systems identify and maintain most frequently used storage data in buffer caches located in main memory, aiming at low-latency I/O data accesses. However, replacement policies can also strongly affect energy consumptions of various connected storage devices, which has not been a consideration in the design and implementation of buffer cache management...
IPv6 has lots of advantages than IPv4, and is suitable for large-scale applications. Based on the analysis of requirement of large-scale area management, a new IPv6-based large-scale lighting devices e-management system is introduced, the architecture is proposed, and a prototype system is implied. In order to verify the performance of the system, experiments are done. It is proved that system architecture...
Query by Singing/Humming (QBSH) is a most natural way for music recognition. A QBSH system can help find songs by matching a part of melody users sing or hum. Many Music Information Retrieval (MIR) techniques have been used to carry out the QBSH goal. In the past, little studies had ever been revealed about how to design and implement a simple QBSH system. In this article, we combine Short-Time-Fourier-Transform,...
Anycast is a new service of IPv6. How to guarantee its quality of service(QoS) has become an important subject. An anycast QoS routing algorithm supporting traffic engineering(ART) in multi-protocol label switching(MPLS) networks is proposed. In order to select a QoS path for client's bandwidth request, information regarding the source-destination pairs is used to reduce the interference between current...
High energy consumption has become a critical challenge in all kinds of computer systems. Hardware-supported Dynamic Power Management (DPM) provides a mechanism to save disk energy by transitioning an idle disk to a low-power mode. However, the achievable disk energy saving is mainly dependent on the pattern of I/O requests received at the disk. In particular, for a given number of requests, a bursty...
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