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Neighbor discovery is the very first step for many mobile applications. Previous neighbor discovery protocols that use single channel may be failed when faced with unreliable channel environment, whereas most of multi-channel schemes do not focus on neighbor discovery in low duty cycle wireless networks. The key challenge for multi-channel slotted neighbor discovery is how to effectively assign the...
Deploying the IPv6 protocol in Wireless Sensor Network (WSN) is the key issue of ubiquitous intelligence and mobile computing in the future. IETF 6LoWPAN enables the IPv6 protocol over IEEE 802.15.4 Low-power Wireless Personal Area Networks (Low PAN). The paper proposes an extended hierarchical routing protocol (E-HiLow), which reduces the memory requirement and the number of control packages and...
The Power & Reliability Aware Protocol (PoRAP) has been developed to provide efficient communication by means of energy conservation without sacrificing reliability. This has been achieved using direct communication, adaptive transmission power adaptation and intelligent scheduling. The key capabilities of PoRAP make it suitable for environmental and habitat monitoring systems. Several experiments...
Heterogeneous multi-core processors have strong potential for performance improvement, energy efficiency and area efficiency, compared to the homogeneous multi-core processors. The present methods of execution migration for heterogeneous multi-core processor suffer in efficiency, cost, compatibility, or programmability. In this paper, we propose a HW/SW code sign migration method based on binary-instrumentation...
In modern processor systems, on-chip Last Level Caches (LLCs) are used to bridge the speed gap between CPUs and off-chip memory. In recent years, the LRU policy effectiveness in low level caches has been questioned. A significant amount of recent work has explored the design space of replacement policies for CPUs' low level cache systems, and proposed a variety of replacement policies. All these pieces...
Energy cost becomes a major part of data center operational cost. Computer system consume more power when it runs under high workload. Many past studies focused on how to predict power consumption by performance counters. Some models retrieve performance counters from chips. Some models query performance counters from OS. Most of these researches were verified on several machines and claimed their...
Flash-based SSDs are becoming increasingly popular in modern storage systems, especially in high-performance computing infrastructures. However, several inherent technical limitations still remain to prevent their widespread deployment. One of the critical concerns is their limited lifetime, which is directly relevant to the total writes experienced by SSDs. In this paper, we present a Content and...
In order to maintain data in an SSD (solid-state disk) cache durable after a crash or reboot, metadata information needs to be stored persistently in SSD. There are two typical metadata methods, update-write-update and write-update. While write-update method has one less SSD write operation than update-write-update for each write I/O, it limits the amount of cached data that can be used after a system...
The high latency and low bandwidth nature of mobile network connection poses a great challenge in the use of network storage system in portable consumer electronics devices. To extend the use of network storage systems, such as cloud storage services in portable consumer electronics device, the built-in NAND flash device can be taken as a front-end cache for network storage system, so the efficiency...
With the quick development of service-oriented network, the services of streaming media and their traffic has become a rather important part in the circumstance of virtual network. However, there hasn't been a unified control mechanism to maintain the qualities of these services. The QoS of streaming media is a great concern of current network, and it'll be vital in future network because of the rapid...
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