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Cloud federation paradigm can help cloud providers (CPs) to overcome resource limitation during spikes in demand, by outsourcing requests to other CPs with idle resources in federation. In this paper, we consider a broker-based market where multiple CPs compete to lease multiple CPs with idle resources for request outsourcing. We propose an iterative double auction mechanism that ensures the efficient...
To improve the spectral efficiency of a cognitive radio system, sensing based spectrum sharing (SBSS) technique combines the advantages of spectrum overlay and spectrum underlay. In this paper, we study the performance of SBSS under primary users' (PUs') rate loss constraint. To be specific, efficient algorithms are introduced to find the optimal sensing time and power allocation in both single-carrier...
The emerging cloud federation paradigm advocates cooperation among different cloud providers (CPs), where the CPs with resource limitation during spikes in demand can outsource the requests to other CPs with idle resources in federation. Meanwhile, underutilized providers can lease part of their unused capacity to other federation members, in order to avoid wasting idle resources. In this paper, we...
Developing learners¡¦ life skills become an important research issue. This study design and evaluate a digital instructional game combining situated learning and role-playing strategies for life skill training. Through the empirical evaluation, this study preliminarily explored learners¡¦ attitudes toward usefulness, ease of use and game elements. Finally, this paper also discusses the potential and...
Multi-threshold CMOS (MTCMOS) is currently the most popular methodology in industry for implementing a power gating design, which can effectively reduce the leakage power by turning off inactive circuit domains. However, large peak current may be consumed in a power-gated domain during its sleep-to-active mode transition. As a result, major IC foundries recommend turning on power switches one by one...
Improving the endurance of PCM is a fundamental issue when the technology is considered as an alternative to main memory usage. In the design of memory-based wear leveling approaches, a major challenge is how to efficiently determine the appropriate memory pages for allocation or swapping. In this paper, we present an efficient wear-leveling design that is compatible with existing virtual memory management...
Overlay resource allocation mechanism of P2P application intensifies congestion at backbone. Current traffic engineering algorithm doesn't adapt to P2P traffic demand. It fails to achieve load balance in link utilization. To tackle this problem, we propose a united resource allocation architecture called Pharos by collaboration of both ISP and P2P. In the architecture, we establish overlay path metrics...
Camera handoff is a crucial step to generate a continuously tracked and consistently labeled trajectory of the object of interest in multi-camera surveillance systems. Most existing camera handoff algorithms concentrate on data association, namely consistent labeling, where images of the same object are matched across different cameras. However, most real-time object tracking systems see a decrease...
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