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Software Defined Multihop Wireless Networks: Promises and Challenges
Afsane Zahmatkesh,Thomas Kunz 한국통신학회 2017 Journal of communications and networks Vol.19 No.6
In multihop wireless networks (MWNs), wireless nodescan communicate with each other through intermediate nodeswithout the help of any infrastructure. Therefore, wireless nodesare responsible for organizing and configuring the network, andthe management of the network is distributed between the nodes. Consequently, it is difficult to overcome the existing challengessuch as node mobility and dynamic topology changes, energy constraints,etc. Software defined networking (SDN) is a promisingsolution, which decouples the control plane and the data planeto overcome the challenges of traditional networks. In the SDNconcept, a logically centralized controller makes routing decisionsbased on the global view of the network and the requirements ofapplications, and then programs the network. Therefore, it helpsto optimize resource allocation and improve the network performance. In this paper, we consider the benefits and the various aspectsof applying the SDN concept in MWNs (SDMWN). We firstintroduce MWNs, existing challenges and the motivation for applyingSDN to such networks. Then, after explaining the SDN concept,we review the related work in SDMWN. Finally, we discussthe challenges in applying SDN and future research directions inthis area.
( Patrick Prager ),( Manuela Kunz ),( Regina Ebert ),( Ludger Klein-hitpass ),( Jakob Sieker ),( Thomas Barthel ),( Franz Jakob ),( Christian Konrads ),( Andre Steinert ) 대한슬관절학회 2018 대한슬관절학회지 Vol.30 No.3
Purpose: Mesenchymal stem cells (MSCs) isolated from the anterior cruciate ligament (ACL) share multiple characteristics of bone marrow-derived mesenchymal stem cells (BMSCs), allowing their use for regenerative therapies. Injuries to the ACL can affect people of all ages. This study assesses whether the regenerative potential of ACL-derived MSCs (ACL-MSCs) from old donors is as high as the potential of ACL-MSCs from young donors. Materials and Methods: ACL-MSCs were isolated from ACL tissues obtained from young and old donors at the time of ACL reconstruction or arthroplasty. Proliferative capacity, multilineage differentiation potential (chondrogenic, osteogenic, and adipogenic lineages), and transcriptome-wide gene expression were assessed and compared between young and old donors. BMSCs of middle-aged donors served as an additional comparator. Results: No substantial differences between ACL-MSCs from young and old donors were observed in their proliferative capacity and multilineage differentiation potential. The latter did not substantially differ between both ACL-MSC groups and BMSCs. Differential expression of genes related to the cytoskeleton and to protein dephosphorylation amongst other pathways was detected between ACL-MSCs from young and old donors. Conclusions: Regenerative potential of ACL-MSCs from old donors was not substantially lower than that from young donors, suggesting that regenerative therapies of ACL tears are feasible in both age groups. In vivo studies of the effect of age on the efficacy of such therapies are needed.
Cross-Layer Architecture for QoS Provisioning in Wireless Multimedia Sensor Networks
( Muhammad Omer Farooq ),( Marc St-hilaire ),( Thomas Kunz ) 한국인터넷정보학회 2012 KSII Transactions on Internet and Information Syst Vol.6 No.1
In this paper, we first survey cross-layer architectures for Wireless Sensor Networks (WSNs) and Wireless Multimedia Sensor Networks (WMSNs). Afterwards, we propose a novel cross-layer architecture for QoS provisioning in clustered and multi-hop based WMSNs. The proposed architecture provides support for multiple network-based applications on a single sensor node. For supporting multiple applications on a single node, an area in memory is reserved where each application can store its network protocols settings. Furthermore, the proposed cross-layer architecture supports heterogeneous flows by classifying WMSN traffic into six traffic classes. The architecture incorporates a service differentiation module for QoS provisioning in WMSNs. The service differentiation module defines the forwarding behavior corresponding to each traffic class. The forwarding behavior is primarily determined by the priority of the traffic class, moreover the service differentiation module allocates bandwidth to each traffic class with goals to maximize network utilization and avoid starvation of low priority flows. The proposal incorporates the congestion detection and control algorithm. Upon detection of congestion, the congested node makes an estimate of the data rate that should be used by the node itself and its one-hop away upstream nodes. While estimating the data rate, the congested node considers the characteristics of different traffic classes along with their total bandwidth usage. The architecture uses a shared database to enable cross-layer interactions. Application`s network protocol settings and the interaction with the shared database is done through a cross-layer optimization middleware.
Open Cirrus: A Global Cloud Computing Testbed
Avetisyan, Arutyun I,Campbell, Roy,Gupta, Indranil,Heath, Michael T,Ko, Steven Y,Ganger, Gregory R,Kozuch, Michael A,O'Hallaron, David,Kunze, Marcel,Kwan, Thomas T,Lai, Kevin,Lyons, Martha,Milojicic, IEEE 2010 Computer Vol.43 No.4
<P>Open Cirrus is a cloud computing testbed that, unlike existing alternatives, federates distributed data centers. It aims to spur innovation in systems and applications research and catalyze development of an open source service stack for the cloud.</P>