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User Centric Content Management System for Open IPTV Over SNS
전승현,안상홍,윤장우,이현우,최준균 한국통신학회 2015 Journal of communications and networks Vol.17 No.3
Coupled schemes between service-oriented architecture (SOA) and Web 2.0 have recently been researched. Webbased content providers and telecommunications company (Telecom) based Internet protocol television (IPTV) providers have struggled against each other to accommodate more three-screen service subscribers. Since the advent of Web 2.0, more abundant reproduced content can be circulated. However, because according to increasing device’s resolution and content formats IPTV providers transcode content in advance, network bandwidth, storage and operation costs for content management systems (CMSs) are wasted. In this paper, we present a user centric CMS for open IPTV, which integrates SOA and Web 2.0. Considering content popularity based on a Zipf-like distribution to solve these problems, we analyze the performance between the user centric CMS and the conventionalWeb syndication system for normalized costs. Based on the user centric CMS, we implement a social Web TV with device-aware function, which can aggregate, transcode, and deploy content over social networking service independently.
Electrophysiological Characterization of AMPA and NMDA Receptors in Rat Dorsal Striatum
전승현,조형석,김기정,Qing Zhong Li,성기욱 대한약리학회 2009 The Korean Journal of Physiology & Pharmacology Vol.13 No.3
The striatum receives glutamatergic afferents from the cortex and thalamus, and these synaptic transmissions are mediated byα-amino-3-hydroxy-5-methyl-4-isoxazolepropionate (AMPA) and N-methyl- D-aspartate (NMDA) receptors. The purpose of this study was to characterize glutamate receptors by analyzing NMDA/AMPA ratio and rectification of AMPA and NMDA excitatory postsynaptic currents (EPSCs) using a whole-cell voltage-clamp method in the dorsal striatum. Receptor antagonists were used to isolate receptor or subunit specific EPSC, such as (DL)-2-amino-5-phosphonovaleric acid (APV), an NMDA receptor antagonist, ifenprodil, an NR2B antagonist, CNQX, an AMPA receptor antagonist and IEM-1460, a GluR2-lacking AMPA receptor blocker. AMPA and NMDA EPSCs were recorded at −70 and +40 mV, respectively. Rectification index was calculated by current ratio of EPSCs between +50 and −50 mV. NMDA/AMPA ratio was 0.20±0.05, AMPA receptor ratio of GluR2-lacking/GluR2- containing subunit was 0.26±0.05 and NMDA receptor ratio of NR2B/NR2A subunit was 0.32±0.03. The rectification index (control 2.39±0.27) was decreased in the presence of both APV and combination of APV and IEM-1460 (1.02±0.11 and 0.93±0.09, respectively). These results suggest that the major components of the striatal glutamate receptors are GluR2-containing AMPA receptors and NR2A- containing NMDA receptors. Our results may provide useful information for corticostriatal synaptic transmission and plasticity studies.
A Cache Hit Ratio based Power Consumption Model for Wireless Mesh Networks
전승현,서용준 대한산업경영학회 2020 산업융합연구 Vol.18 No.2
Industrial IoT has much interested in wireless mesh networks (WMNs) due to cost effectiveness and coverage. According to the advance in caching technology, WMNs have been researched to overcome the throughput degradation of multihop environment. However, there is few researches of cache power consumption models for WMNs. In particular, a wired line based cache power consumption model in content-centric networks is not still proper to WMNs. In this paper, we split the amount of cache power from the idle power consumption of CPU, and then the cache hit ratio proportional power consumption model (CHR-model) is proposed. The proposed CHR-model provides more accurate power consumption in WMNs, compared with the conventional cache power efficiency based consumption model (CPE-model). The proposed CHR-model can provide a reference model to improve energy-efficient cache operation for Industrial IoT.