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Recent NAND flash devices have large page sizes. Although large pages are useful in increasing the flash capacity, they can degrade both the performance and lifetime of flash storage systems when small writes are dominant. We propose a new NAND programming scheme, called erase-free subpage programming (ESP), which allows the same page to be programmed multiple times for small writes. By avoiding internal...
This paper proposes a new congestion control method based on a hop-by-hop rate control in named data networking (NDN). The proposed method suppresses the excessive reduction of Interest sending rate due to continuous negative acknowledgement (NACK) packets caused by the propagation delay. The proposed method limits the rate reduction to once per congestion. The point of our method is not to change...
In the recent past, satellite TV faces fierce market competitions with cable TV, IPTV, and the increasingly prevalent Internet TV. It can be anticipated that, in order to successfully survive in the next decade, satellite TV operators will deliver a larger number of TV channels with diverse programs in enhanced video formats, such as ultra-HD and 3D, to bring viewers much richer video and audio experience...
We report on the principle and broadband operation of ring-shaped piezoelectric micromachined ultrasonic transducers (pMUTs) in liquid-coupled operation. Specifically, fabricated devices are measured to have a velocity bandwidth of up to 160%, which is more than 60% greater than the highest bandwidth of any reported pMUT and is tunable by altering device dimensions. This broadband performance is due...
In the present time, the Research and industry are showing more interest in Vehicular Networks. Vehicular Network is providing the Road Safety, Security, traffic monitoring, comfort driving types of applications for person safety. It is the essential point that the servers which are using for safety not give any drawback and problem. For proper communication, it is essential that the communication...
3GPP has been working in establishing a new network infrastructure based on unlicensed spectrum known as LTE Secondary Cell (SCell) in a carrier aggregation scenario in which LTE user terminals would still be anchored to an LTE Primary Cell (PCell) over licensed spectrum. On this scenario, best-effort content would be delivered on the unlicensed band SCell, while QoS traffic and control signaling...
Recently, large amount of data is transferred over network. The available bandwidth of network varies momently, so it is important to realize the efficient data transfer by fully utilizing the time-varying network bandwidth. We are developing the method of efficient data communication by dynamically compressing data, assuming the use of the high performance of multi-core processors. Our method can...
Database management systems (DBMS) is a common service in clouds. Cloud platforms use virtualization to consolidate servers for efficient resource utilization and to isolate collocated users' workloads. The underlying virtualization technologies have critical impact on the performance and isolation, especially in disk I/O, in DBMS. There are two major virtualization approaches: the hypervisor-based...
We present a performance evaluation conducted on a production supercomputer of the Intel Xeon Processor E5-2680v3, a twelve-core implementation of the fourth-generation Haswell architecture, and compare it with Intel Xeon Processor E5-2680v2, an Ivy Bridge implementation of the third-generation Sandy Bridge architecture. Several new architectural features have been incorporated in Haswell including...
Recently, the multi-tiered storage systems that are composed of hard disk drives (HDDs) and solid state disk drives (SSDs) have received significant attention. The multi-tiered storage system extends the storage hierarchy by using SSDs to cache data from the HDDs. Thus, how to cache the appropriate data on the SSDs becomes an important issue for the multi-tiered storage systems. Due to the tremendous...
The Ultra Dense Network (UDN), as a key enabler for future wireless networks (such as 5G), is comprised of a massive number of small cells in the network. Nonetheless, energy consumption will be non-negligible when a large number of smallcell Base Stations (BSs) are densely deployed. One practical and effective approach to reduce the energy consumption of the UDN is through dynamically controlling...
Large off-die stacked DRAM caches have been proposed to provide higher effective bandwidth and lower average latency to main memory. Designing a large off-die DRAM cache with conventional block size requires a large tag array which is impractical to fit on-die. Placing the large directory off-die prolong the latency since a tag access is necessary before the data can be accessed. This additional trip...
We present ConVenus, a system that performs rapid congestion verification of network updates in software-defined networks. ConVenus is a lightweight middleware between the SDN controller and network devices, and is capable to intercept flow updates from the controller and verify whether the amount of traffic in any links and switches exceeds the desired capacity. To enable online verification, ConVenus...
Solid state disks (SSDs) become more and more popular in personal devices and data centers. Flash chips can be packaged in Hard disk drive (HDD) form factors and provide the same interface as HDDs. This character makes SSDs easily replace HDDs in existing storage systems. PCIe-based SSD can provide a higher I/O performance, but it is still a little expensive. This paper studies the feasibility of...
Indoor positioning systems are drawing ascending attention from the academia as well as industry, motivated by a wide variety of indoor location-based services. Among the existing indoor positioning systems, WiFi-based schemes are more favorable because of the ubiquitous WiFi infrastructures. However, both strong non-line-of-sight scenario and severe ambiguity among location-specific fingerprints...
Cloud computing technology is rapidly emerging as quite an efficient execution platform for even highly trusted scientific applications. Efficient resource management plays a pivotal role in the execution along with attaining high performance standards in Distributed environments. Resource provisioning and scheduling has become an important area of research in cloud resource management. Clouds can...
With the introduction of the new NVIDIA Pascal GPU architecture, the need to evaluate its real performance in HPC environments arises. In this paper we briefly present some preliminary results. Compared to its predecessors, the new architecture clearly shows a great improvement.
NVMe is emerging as the standard protocol for communicating with high performance storage devices over the PCIe interface, independent of the underlying storage technology. Being a relatively new standard, there is a distinct lack of tools that can help in evaluating contemporary and future storage solutions built on NVMe. In this paper, we provide the design and analysis of FlexDrive, a software...
As more and more consumers access streaming video content over the internet, enterprises across the entire video distribution value chain experience tremendous pressure to deliver better performance and high quality of experience (QoE) to the end users. Enhanced video performance is highly desirable, starting from the Video Origin Servers through the core network and Content Delivery Networks (CDN)...
Multipath TCP (MPTCP) is an evolvable technology for bandwidth aggregation on a mobile device. MPTCP naturally and concurrently exploits wireless links via different interfaces (i.e., Wi-Fi and cellular) for data transferring. Theoretically, the MPTCP's aggregated throughput is better or at least equals to the TCP throughput over a link. However, our investigation of MPTCP performance in a lossy wireless...
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