Jiazhen Zhou

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In this paper, we investigate the scalability of three communication architectures for advanced metering infrastructure (AMI) in smart grid. AMI in smart grid is a typical cyber-physical system (CPS) example, in which large amount of data from hundreds of thousands of smart meters are collected and processed through an AMI communication infrastructure.(More)
BACKGROUND Oligodendrocyte precursor cells (OPCs) differentiate into oligodendrocytes (OLs), which are responsible for myelination. Myelin is essential for saltatory nerve conduction in the vertebrate nervous system. However, the molecular mechanisms of maturation and myelination by oligodendrocytes remain elusive. METHODS AND FINDINGS In the present(More)
Tagging is nowadays the most prevalent and practical way to make images searchable. However, in reality many manually-assigned tags are irrelevant to image content and hence are not reliable for applications. A lot of recent efforts have been conducted to refine image tags. In this paper, we propose to do tag refinement from the angle of topic modeling and(More)
Visual reranking has become a widely-accepted method to improve traditional text-based image search results. The main principle is to exploit the visual aggregation property of relevant images among top results so as to boost ranking scores of relevant images, by explicitly or implicitly detecting the confident relevant images, and propagating ranking(More)
In this paper we present a single node decomposition based model for the analysis of wireless mesh networks. With knowledge of the network topology and routing strategy, the performance of each node, including throughput, delay, etc., can be analyzed using a simple M/G/1 model that takes into account the interference due to neighbor transmissions. With this(More)
Oligodendrocyte precursor cells (OPCs) are a unique type of glia that are responsible for the myelination of the central nervous system. OPC migration is important for myelin formation during central nervous system development and repair. However, the precise extracellular and intracellular mechanisms that regulate OPC migration remain elusive. Slits were(More)
The explosion of multimedia content in social media networks raises a great demand of developing tools to facilitate producing, sharing and viewing media content. Flickr groups, self-organized communities with declared common interests, are able to help users to conveniently participate in social media network. In this paper, we address the problem of(More)
In this paper we introduce the preemption threshold based strategy to cellular networks for supporting emergency traffic. With the new strategy, in addition to providing immediate access for emergency traffic, a certain amount of resources can be protected for public traffic by tuning the preemption threshold. Also, with the assumption that preempted users(More)
Preemption is a possible way to ensure emergency traffic's priority in wireless network. But a pure preemption policy can be especially harsh to low priority calls. A way to improve this is introducing a queuing mechanism, which means putting preempted calls into a queue so that they can resume when channels become available, as long as they do not give up(More)