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The cross-point array architecture with resistive synaptic devices has been proposed for on-chip implementation of weighted sum and weight update in the training process of learning algorithms. However, the non-ideal properties of the synaptic devices available today, such as the nonlinearity in weight update, limited ON/OFF range and device variations, can potentially hamper the learning accuracy...
This paper provides new insights into the effect of device characteristics on multilevel-cell (MLC) operation, aiming at potential benefits, such as the reduction of write latency and peripheral circuit design overhead. A general categorization of the MLC-operating schemes in storage-class memory (SCM) is proposed to connect the total number of write inputs with fundamental device properties. The...
To support the fast growing cloud computing services and provide a core infrastructure to meet the increasing computing and storage requirements, the number of servers in today's data centers is expanding exponentially, which leads to enormous challenges in designing an efficient and cost-effective data center network. Traditional proposals either suffer from poor reliability, endure performance bottleneck,...
We propose a flexible and resilient SDN-controlled hybrid optical/electrical intra-DCN architecture employing low-cost distributed optical switches. Significant delay reduction as well as automatic flow path setup and restoration are demonstrated using real-time traffic over an experimental OpenFlow-based testbed.
Data center network architecture is regarded as one of the most important determinants of network performance. As the most typical representatives of architecture design, the server-centric scheme stands out due to its good performance in various aspects. However, there still exist some critical shortcomings in these server-centric architectures. In order to provide an efficient solution to these...
This paper presents the design, implementation and evaluation of SprintNet, a novel network architecture for data centers. SprintNet achieves high performance in network capacity, fault tolerance, and network latency. SprintNet is also a scalable, yet low-diameter network architecture where the maximum shortest distance between any pair of servers can be limited by no more than four and is independent...
Large-scale data centers enable the new era of cloud computing and provide the core infrastructure to meet the computing and storage requirements for both enterprise information technology needs and cloud-based services. To support the ever-growing cloud computing needs, the number of servers in today’s data centers are increasing exponentially, which in turn leads to enormous challenges in designing...
Software-Defined Networking (SDN) enables efficient and scalable network virtualization. Infrastructure resources, such as computing and networking resources, can be abstracted and outsourced as a service using virtualization technology. These SDN features can be extended to the optical transport networks to enable high capacity, low cost, and long reach transport networks. In this paper, we introduce...
We demonstrate a novel in-building small-cell backhaul architecture for multi-operator, multi-service coexistence with optical infrastructure sharing. In-building experiments confirm 6-12Mb/s layer-4 packet throughputs for users under mobile distributed antenna and static frequency re-use scenarios, respectively.
Next generation data centers will have to face an increased amount of network traffic due to emerging applications such as cloud computing. Processing larger data volume leads to higher energy consumption, which in turn causes higher operation expense. Optical interconnects have gained attention recently as a promising solution due to its large bandwidth and high energy efficiency compared to the...
The first downstream/upstream OFDMA/TDMA-PON achieving >100Mb/s per-cell mobile backhaul and burst-mode operation using off-the-shelf APDs is demonstrated over 1.645km for 200 cells. The new approach enables <1ms transmission latency and 3dB burst-mode dynamic range tolerance.
Based on E-government framework, in-depth explored the application approach of cloud computing technology in the field of E-government, and given the "Integration, Applications, Services, Efficiency, " as the main idea, which promoted the integration of government information resource and the intensification construction in E-government area. Based on the in-depth analysis of drawbacks on...
In this paper, we present our early performance evaluation results with the NPB benchmark and two scientific computing applications program, i.e., a HFFT package developed by our lab and a CFDO application software, on two 100 Teraflops-scale Dawning 5000A and DeepComp 7000. We compared the NPB performance evaluation results of Dawning 5000A and DeepComp 7000, with their corresponding predecessor,...
The increasing demand for application specific processing on portable devices is driving the design with highly efficient hardware. Many applications are streamlined, and the delays of all streamline stages better be equalized. Unfortunately, loads at each stage of streamlined processing may vary depending on input data, making load monitoring and balancing very desirable hardware features. The aim...
In this paper, a microcell is designed for enhancing the uplink capacity of an existing terrestrial cellular code division multiple access (CDMA) system. The proposed designs involve integration of a high altitude platform station (HAPS) and the terrestrial system. By adjusting the projection of a phased array antenna onboard the HAPS, two designs of microcell are developed in the integrated system...
Effective management of Web Services systems relies on accurate understanding of end-to-end transaction flows, which may change over time as the service composition evolves. This work takes a data mining approach to automatically recovering end-to-end transaction flows from (potentially obscure) monitoring events produced by monitoring tools. We classify the caller-callee relationships among monitoring...
Todaypsilas access network is migrating towards broadband IP, fixed/mobile convergence and service convergence. Thus, the next generation access network (NGAN) requires a converged optical/wireless access network infrastructure, other than the existing architecture that connect to the cellular, broadband wireless, and optical access networks separately, which complicate the network and increase the...
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