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( Guolin Sun ),( Timothy Dingana ),( Sebakara Samuel Rene Adolphe ),( Gordon Owusu Boateng ) 한국인터넷정보학회 2019 KSII Transactions on Internet and Information Syst Vol.13 No.5
Resource sharing is one of the main goals achieved by network virtualization technology to enhance network resource utilization and enable resource customization. Though resource sharing can improve network efficiency by accommodating various users in a network, limited infrastructure capacity is still a challenge to ultra-low latency service operators. In this paper, we propose an inter-slice resource borrowing schema based on the device-to-device (D2D) potentiality especially for ultra-low latency transmission in cellular networks. An extended and modified Kuhn-Munkres bipartite matching algorithm is developed to optimally achieve inter-slice resource borrowing. Simulation results show that, proper D2D user matching can be achieved, satisfying ultra-low latency (ULL) users’ quality of service (QoS) requirements and resource utilization in various scenarios.
User Bandwidth Demand Centric Soft-Association Control in Wi-Fi Networks
( Guolin Sun ),( Sebakara Samuel Rene Adolphe ),( Hangming Zhang ),( Guisong Liu ),( Wei Jiang ) 한국인터넷정보학회 2017 KSII Transactions on Internet and Information Syst Vol.11 No.2
To address the challenge of unprecedented growth in mobile data traffic, ultra-dense network deployment is a cost efficient solution to offload the traffic over some small cells. The overlapped coverage areas of small cells create more than one candidate access points for one mobile user. Signal strength based user association in IEEE 802.11 results in a significantly unbalanced load distribution among access points. However, the effective bandwidth demand of each user actually differs vastly due to their different preferences for mobile applications. In this paper, we formulate a set of non-linear integer programming models for joint user association control and user demand guarantee problem. In this model, we are trying to maximize the system capacity and guarantee the effective bandwidth demand for each user by soft-association control with a software defined network controller. With the fact of NP-hard complexity of non-linear integer programming solver, we propose a Kernighan Lin Algorithm based graph-partitioning method for a large-scale network. Finally, we evaluated the performance of the proposed algorithm for the edge users with heterogeneous bandwidth demands and mobility scenarios. Simulation results show that the proposed adaptive soft-association control can achieve a better performance than the other two and improves the individual quality of user experience with a little price on system throughput.
Electrospinning composite nanofibers of polyacrylonitrile/synthetic Na-montmorillonite
Sliman Almuhamed,Magali Bonne,Nabyl Khenoussi,Jocelyne Brendle,Laurence Schacher,Be´ne´ dicte Lebeau,Dominique C. Adolphe 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.35 No.-
Nonwovens of polymer/clay composite nanofibers (namely, polyacrylonitrile/Na-montmorillonite, PAN/Na-MMT) are produced by electrospinning a solution of PAN in dimethylformamide containing syntheticNa-MMT. The influence of both Na-MMT amount and applied voltage on the properties of electrospuncomposite nonwovens was studied. Scanning electron microscopy (SEM), X-ray diffraction (XRD) andthermogravimetric analysis (TGA–DTA) were used to evaluate the morphology, structure and thermalproperties of composite nanofibers. SEM observations revealed that increasing the amount of Na-MMT inthe solution or the applied voltage increases the average diameter of electrospun composite nanofibers. The prepared composite showed a higher thermal stability that the pristine PAN nanofibers. It wasproven that the ion exchange properties of Na-MMT were maintained in the obtained composite.
A category-specific response to animals in the right human amygdala
Mormann, Florian,Dubois, Julien,Kornblith, Simon,Milosavljevic, Milica,Cerf, Moran,Ison, Matias,Tsuchiya, Naotsugu,Kraskov, Alexander,Quiroga, Rodrigo Quian,Adolphs, Ralph,Fried, Itzhak,Koch, Christof Nature Publishing Group, a division of Macmillan P 2011 NATURE NEUROSCIENCE Vol.14 No.10
The amygdala is important in emotion, but it remains unknown whether it is specialized for certain stimulus categories. We analyzed responses recorded from 489 single neurons in the amygdalae of 41 neurosurgical patients and found a categorical selectivity for pictures of animals in the right amygdala. This selectivity appeared to be independent of emotional valence or arousal and may reflect the importance that animals held throughout our evolutionary past.