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RISS 인기검색어
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- 저자 : Guobing Yan (검색결과 3 건)
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Wireless Energy-Harvesting Cognitive Radio with Feature Detectors
( Yan Gao ),( Yunfei Chen ),( Zhibin Xie ),( Guobing Hu ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.10
The performances of two commonly used feature detectors for wireless energy-harvesting cognitive radio systems are compared with the energy detector under energy causality and collision constraints. The optimal sensing duration is obtained by analyzing the effect of the detection threshold on the average throughput and collision probability. Numerical examples show that the covariance detector has the optimal sensing duration depending on an appropriate choice of the detection threshold, but no optimal sensing duration exists for the ratio of average energy to minimum eigenvalue detector.
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Zhenduo Ma,Qiang Peng,Guobing Wei,Yan Yang,Tiancai Xu,Weidong Xie,Gang Liu,Xiaodong Peng 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.11
The microstructure, mechanical property and corrosion behavior of gravity casting and centrifugal casting Mg–9Li–3Al–1Ca alloy were investigated. The results indicate that the Mg–9Li–3Al–1Ca alloy is mainly composed of α-Mg phases, β-Liphases and Al2Caphases. After centrifugal casting, the blocky and elongated α-Mg phases of the gravity casting alloy canbe refined and spheroidized. Meanwhile, the amount of α-Mg and AlLi phases increases, however, the number of Al2Caphases decreases. Besides, a strong texture of β-Li phase on the (200) plane can be formed. The microstructure refinementand the decrease of Al2Caphases lead to the improvement of comprehensive property. The property of centrifugal alloyshas gradient along radius direction because the strength of centrifugal force varies with the centrifugal radius. The centrifugalcasting Mg–9Li–3Al–1Ca alloy at outside exhibits excellent comprehensive properties. The ultimate tensile strengthand elongation of centrifugal casting alloy achieve the value of 198.3 MPa and 6.0%, corresponding to 83.6% and 300.0%increments compared with gravity casting ones, respectively. The corrosion current also decreases to 89.4 μA/cm2, whichattributes to the weakening of galvanic corrosion attributing to the decrease of number of Al2Caphases and the transformationof corrosion pattern caused by grain refinement.
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Hua Ye,Hongyu Wu,Liangyuan Chen,Songhua Ma,Kaifeng Zhou,Guobing Yan,Jiazhong Shen,Dongcheng Chen,Shi‑Jian Su 대한금속·재료학회 2018 ELECTRONIC MATERIALS LETTERS Vol.14 No.2
A series of new small molecules based on symmetric electron-acceptor of 1,3,4-oxadiazole moiety or its asymmetric isomerof 1,2,4-oxadiazole unit were successfully synthesized and applied to solution-processable blue phosphorescent organic lightemittingdiodes for the first time, and their thermal, photophysical, electrochemical properties and density functional theorycalculations were studied thoroughly. Due to the high triplet energy levels (ET, 2.82–2.85 eV), the energy from phosphorescentemitter of iridium(III) bis[(4,6-difluorophenyl)-pyridinate-N,C2′]picolinate (FIrpic) transfer to the host molecules couldbe effectively suppressed and thus assuring the emission of devices was all from FIrpic. In comparison with the para-modeconjugation in substitution of five-membered 1,3,4-oxadiazole in 134OXD, the meta-linkages of 1,2,4-isomer appending withtwo phenyl rings cause the worse conjugation degree and the electron delocalization as well as the lower electron-withdrawingability for the other 1,2,4-oxadiazole-based materials. Noting that the solution-processed device based on 134OXD containing1,3,4-oxadiazole units without extra vacuum thermal-deposited hole/exciton-blocking layer and electron-transportinglayer showed the highest maximum current efficiency (CEmax) of 8.75 cd/A due to the excellent charge transporting ability of134OXD, which far surpassed the similar devices based on other host materials containing 1,2,4-oxadiazole units. Moreover,the device based on 134OXD presented small efficiency roll-off with current efficiency (CE) of 6.26 cd/A at high brightnessup to 100 cd/m2. This work demonstrates different nitrogen and oxygen atom orientations of the oxadiazole-based hostmaterials produce major impact on the optoelectronic characteristics of the solution-processable devices.
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