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Container-based virtualization offers several advantages such as high performance, resource efficiency, and agile environment, which can make IoT device management easy. Though previous studies introduce container-based virtualization to IoT devices, they do not address different network modes of containers and the performance issues. Because the network performance is an important factor in IoT,...
The LTE system that traditionally uses the licensed band have added the new technology, licensed assisted access (LAA), that enables to use 5 GHz unlicensed band with existing licensed band. Coexistence with Wi-Fi is major part of the LAA technology and regulations relating to coexistence has been revised after LAA technology emerged in Europe. Channel occupancy time (COT) is a critical parameter...
Volume Diagnosis is a proven methodology to significantly improve the yield enhancement rates. One of the key factors of success to this methodology is being able to perform diagnosis on hundreds to thousands of failing dies using a limited amount of computational resource in a tractable time. This paper presents a new Multiple Device Diagnosis (MDD) system to significantly improve the throughput...
Burst buffers tolerate I/O spikes in High-Performance Computing environments by using a non-volatile flash technology. Burst buffers are commonly located between parallel file systems and compute nodes, handling bursty I/Os in the middle. In this architecture, burst buffers are shared resources. The performance of an SSD is significantly reduced when it is used excessively because of garbage collection,...
Over the past two decades, implementing routing lookups in dedicated hardware has been accepted as an undisputable gold standard in core Internet routers due to ever increasing performance requirements and unabated global routing table growth. Several recent proposals depart from that line of thinking and suggest that software algorithms running on commodity multi-core CPUs might (again) become well...
Network function virtualization (NFV) is a concept aiming to achieve telecom grade cloud ecosystem for new generation networks focusing on Capital and Operational expenditure (CAPEX and OPEX) savings. Keeping at least the same performances is one of the main requirements of the applications when being virtualized. This work presents a performance impact of Open Virtual Switch (OVS) user-space forwarding...
IPv6 is an ultimate solution to the Internet address exhaustion. It is believed, the protocol will be requested by not only human but also everything on the earth surface. Furthermore, the improvement on the protocol is important to achieve IP packets transmission efficiently. Processing technology has been improved to become very fast packet processing both in host as well as intermediate systems...
Nowadays, web service selection has become a very challenging issue. As the number of web services is increasing drastically, different QoS parameters are added in their description in addition to their functional parameters (Inputs and outputs) to distinguish them and ease their selection. Hence, web service selection consists to find out among services having the same functionalities the optimal...
The prominent cloud services rely on geographically distributed nodes running replication and other fault-tolerance mechanisms so as to provide flawless availability and dependability. In this paper, we address the communication cost of the well known primary-backup replication protocol, and propose compressed periodic incremental checkpoint algorithms to achieve improved throughput. We set up a replicated...
Hybrid storage is widely implemented as it satisfies the requirements of capacity and performance in an economically viable fashion. With the fast technical improvement, Hybrid storage systems consisting of several types of SSDs will be adopted gradually. Existing works mostly concentrate on thoroughly utilizing high-performance device but neglect the capability of low-performance device. This paper...
Cloud computing has been adapted for various application areas because it can reduce the time required for system development and the cost of hardware. One of the factors that degrades performance stability of applications running in the cloud is “unexpected loads”, caused by interference between Virtual Machines (VMs) coexisting on the same physical machine. In this paper, we propose a VM scaling...
This paper presents a mobility-aware channel allocation strategy for clustered ad hoc network. Our main novelty is to consider the mobility associated with the number of times that the channel with larger spectral distance is allocated to guide the channel allocation process, while quickly responding to changes in the network topology. In our performance evaluation, we use a realistic mobility model...
In this paper, we introduce the mixture communication method of single-flit and wormhole routing. In the method, a buffer memory is shared in each link and virtual channels are assigned. We also evaluated the dynamic communication performance with various amount of buffers. As a result, it was shown that the communication performance could be predicted from the packet length.
Nowadays the mobile radio technology is largely used to deliver Internet contents. Many studies to investigate techniques to use more efficiently the already assigned spectrum are currently on going at international level.
Mobile web traffic and application data demands are growing at a rapid rate and are at odds with resource-constrained, data-capped, wireless mobile devices. Data compression can be used to reduce web traffic, save energy, and make network transfers faster. Compression can, however, hurt performance if not used judiciously. We propose Locomotive, a library that improves the performance of network transfers...
While 3GPP has been developing NB-IoT, the market of Low Power Wide Area Networks has been mastered by cheap and simple Sigfox and LoRa/LoRaWAN technologies. Being positioned as having an open standard, LoRaWAN has attracted also much interest from the research community. Specifically, many papers address the efficiency of its PHY layer. However MAC is still underinvestigated. Existing studies of...
WiFi has become the primary method to access the Internet. However, the WiFi-hop latency, particularly in dense-WiFi environments, is far from satisfactory [1], to support delay-sensitive applications such as Web browsing and VoIP. The WiFi latency mainly comes from two kinds of queues: the host queue and the distributed queue, which is caused by CSMA/CA mechanism when multiple nodes contend for the...
In multi-tier cloud service systems, performance evaluation relies on numerous experiments in order to collect key metrics such as resources usage. The approach may result in highly time-consuming in practice. In this paper, we propose an automated framework for performance tracking, data management and analysis to minimize human intervention in multi-tier cloud service systems. The framework support...
Most large popular web applications, like Facebook and Twitter, have been relying on large amounts of in-memory storage to cache data and offer a low response time. As the main memory capacity of clusters and clouds increases, it becomes possible to keep most of the data in the main memory. This motivates the introduction of in-memory storage systems. While prior work has focused on how to exploit...
To take advantage of software defined networking (SDN) within a limited budget constraint, a natural strategy is to incrementally deploy a few SDN switches (and a limited amount of additional link bandwidth) into the legacy optical network. In such a hybrid optical network, operators can only change the routes of flows that traverse SDN switches. Therefore, to optimize SDN deployment, it is essential...
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