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Congestion Detection and Control Strategies for Multipath Traffic in Wirel ess Sensor Networks
( Abdur Razzaque ),( Choong Seon Hong ) 한국정보처리학회 2009 한국정보처리학회 학술대회논문집 Vol.16 No.2
This paper investigates congestion detection and control strategies for multi-path traffic (CDCM) dissemination in lifetime-constrained wireless sensor networks. CDCM jointly exploits packet arrival rate, successful packet delivery rate and current buffer status of a node to measure the congestion level. Our objective is to develop adaptive traffic rate update policies that can increase the reliability and the network lifetime. Our simulation results show that the proposed CDCM scheme provides with good performance.
Image Scene Classification of Multiclass
Abdur Razzaq Fayjie,Guangxing Wang,Kwang-Seong Shin,Seong-Yoon Shin 한국정보통신학회 2021 2016 INTERNATIONAL CONFERENCE Vol.12 No.1
In this paper, we proposed a multiclass image scene classification method based on transform learning. It relied on a pre-trained network model on the ImageNet large image dataset to classify multiclass of natural scene images. In the experiment, the optimized the ResNet model was classified on Kaggle"s Intel Image Classification dataset and achieved excellent results.
Abdur, R.,Jeong, K.,Lee, M.J.,Lee, J. Elsevier Science 2013 Organic electronics Vol.14 No.4
Contact doping was conducted by iodine in a top contact configuration in a pentacene organic thin film transistor (OTFT), to investigate its effects on contact resistance and the resulting electrical performance. Iodine doping in the pentacene film caused the change of pentacene structure, thus leading to an increase in electrical anisotropy, i.e. ratio of lateral to vertical resistivity. The two resistive components of doped pentacene film underneath the Au contacts were major contributors to the contact resistance, and a model to explain the dependence of contact resistance on iodine doping was presented. Finally, OTFTs fabricated on iodine doped source/drain contacts exhibited high mobility of 1.078cm<SUP>2</SUP>/Vs, two times that of OTFTs with undoped contacts, due to the low contact resistance.
Abdur, Rahim,Lee, Young Kyu,Jeong, Kyunghoon,Nam, Ho-Seok,Kim, Young-Ho,Kim, Jiyoung,Lee, Jaegab Elsevier 2015 Organic Electronics Vol.26 No.-
<P><B>Abstract</B></P> <P>Two types of source/drain (S/D) electrodes, formed of poly(3,4-ethylenedioxythiophene):<I>p</I>-toluenesulfonate (PEDOT:PTS) conducting polymer and Au, were fabricated and mounted on flexible pentacene transistors. Several properties of the S/D electrodes were investigated: the adhesion between electrode and pentacene, the failure induced by mechanical bending, the electrical properties including contact resistance, and the field-effect mobility. The measurement of adhesive force using a 90° peel tester revealed that the adhesive force of the pentacene–PEDOT:PTS interface was 200N/m, while that of Au–pentacene was too small to be measured. The poor adhesion between the Au and pentacene led to the local delamination of the Au film, starting at a strain of approximately 1% and with a rapid increase of delamination density with increasing strain. The strain-induced mechanical damage has a direct effect on contact resistance, which in turn degrades mobility. In contrast, no delamination is observed with the high adhesive force at the pentacene–PEDOT:PTS interface, which thus led to a slight increase of contact resistance and mobility with strain. Consequently, the pentacene–PEDOT:PTS contacts provide mechanical and electrical stability in flexible organic thin film transistors (OTFTs) under bending tests.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Mechanical and electrical stability of PEDOT:PTS and Au S/D OTFTs in flexible OTFTs under bending was studied. </LI> <LI> The poor adhesion between Au and pentacene led to the local delamination of the Au film. </LI> <LI> The straining-induced mechanical damage has a direct effect on contact resistance, which in turn degrades mobility. </LI> <LI> The pentacene–PEDOT:PTS contacts provide excellent mechanical and electrical stability in flexible OTFTs under bending tests. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Abdur Rosyid,Bashar El-Khasawneh,Anas Alazzam 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.21 No.6
This paper presents the implementation of nonlinear least squares and iterative linear least squares algorithms for external kinematic calibration of a hybrid kinematics machine composed of two 3PRR planar parallel kinematics mechanisms by utilizing a laser tracker. First the hand-eye and robot-world transformations were obtained by a separable closed-form solution and refi ned by the nonlinear least squares. Subsequently, the geometric parameters of the machine’s mechanisms were estimated using the two algorithms. Due to the rank defi ciency, we implemented the nonlinear least squares algorithm through a subset selection approach in which we performed the estimation in two steps. We iterated the closed-form solution of the linear least squares until the solution converges to the actual values. We have shown that the nonlinear least squares algorithm successfully refi ned the hand-eye and robot-world transformations and outperformed the iterative linear squares algorithm in the estimation of the geometric parameters of the mechanisms.