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The increasing VM density in cloud hosting services makes careful management of physical resources such as CPU, memory, and I/O bandwidth within individual virtualized servers a priority. To maximize cost-efficiency, resource management needs to be coupled with the revenue generating mechanisms of cloud hosting: the service level agreements (SLAs) of hosted client applications. In this paper, we develop...
The popularity of smartphones and mobile applications has boosted over the top (OTT) services during the recent years, and this trend is expected to continue in the future. However, frequent connection reestablishments caused by OTT services which send or receive small amounts of data often lead to a heavy signalling load within the mobile networks. That has brought about signalling storm, which is...
The advent of cloud systems has spurred the emergence of an impressive assortment of Internet services. Recent pressures on enhancing the profitability by curtailing surging dollar costs on energy have posed challenges to, as well as placed a new emphasis on, designing energy-efficient request dispatching and resource management algorithms. What further adds to the design challenge is the highly diverse...
Due to the popularity and importance of Parallel File Systems (PFSs) in modern High Performance Computing (HPC) centers, PFS designs and I/O optimizations are active research topics. However, the research process is often time-consuming and faces cost and complexity challenges in deploying experiments in real HPC systems. This paper describes PFSsim, a trace-driven simulator of distributed storage...
Existing parallel file systems are unable to differentiate I/Os requests from concurrent applications and meet per-application bandwidth requirements. This limitation prevents applications from meeting their desired Quality of Service (QoS) as high-performance computing (HPC) systems continue to scale up. This paper presents vPFS, a new solution to address this challenge through a bandwidth virtualization...
The paper introduces a kind of wired remote meter reading system based on fieldbus in residential districts. In the thesis, the scheme consists of singlechip AT89C51 and CAN-controller SJA1000 as hardware, and interface-program as software. The system solutions are practicality proved in application, with high automation and strong anti-jamming. It can be for reference to similar plans.
The ever-increasing scale of modern high-performance computing (HPC) systems presents a variety of challenges to the parallel file system (PFS) based storage in these systems. The scalability of application check pointing is a particularly important challenge because it is critical to the reliability of computing and it often dominates the I/Os in a HPC system. When a large number of parallel processes...
Resource discovery is an important aspect of computational Grid. Locating resources in a Grid environment is difficult because of the geographic dispersion and dynamic nature of its resources. In this paper, a center-distributed virtual community model is designed. Based on his model, a novel grid resource discovery method is presented. Its simulation experiment shows the present algorithm can solve...
In mobile environment, when downloading and opening learning resources it would need the large data communications bandwidth and strong data processing ability. Due to the intrinsic limitations of a mobile environment, there can be long time latency for a data access. Data prefetching is an approach to this problem. in this paper, a improved data prefetching strategy was proposed. based on existed...
This paper presents a new parallel storage management approach which supports the allocation of shared storage bandwidth on a per-application basis. Existing parallel storage systems are unable to differentiate I/Os from different applications and meet per-application bandwidth requirement. This limitation presents a hurdle for applications to achieve their desired performance, which will become even...
In peer-to-peer environment, information is directly exchanged between nodes instead of forwarding by a central server, hence user-to-user authentication becomes a critical security issue in such environment. Existing solutions are based on public-key cryptosystem. The main concerns in a public-key cryptosystem include authenticity of the public key and lack of efficiency. A trusted third party is...
A grid-wide distributed file system provides convenient data access interfaces that facilitate fine-grained cross-domain data sharing and collaboration. However, existing widely-adopted distributed file systems do not meet the security requirements for grid systems. This paper presents a Secure Grid File System (SGFS) which supports GSI-based authentication and access control, end-to-end message privacy,...
Virtual Machines are becoming increasingly valuable to resource consolidation and management, providing efficient and secure resource containers, along with desired application execution environments. This paper focuses on the VM-based resource reservation problem, that is, the reservations of CPU, memory and network resources for individual VM instances, as well as for VM clusters. In particular,...
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