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Hybrid Aging Delay Model Considering the PBTI and TDDB

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Journal of Electronic Science and Technology 2015年第3期13卷 276-281页

作者： Yong Miao mao-xiang Yi Gui-mao Zhang Da-Wen Xu the School of Electronic Science and Applied Physics Hefei University of Technology

With a 45 nm process technique, the shrinking silicon feature size brings in a high-k/metal gate which significantly exacerbates the positive bias temperature instability （PBTI） and time-dependent dielectric breakdown （TDDB） effects of a NMOS transistor. However, previous works presented delay models to characterize the PBTI or TDDB individually. This paper demonstrates that the delay caused by the joint effects of PBTI and TDDB widely differs from the cumulated result of the delay caused by the PBT｜ and TDDB, respectively, with the experiments on an inverter chain. This paper proposes a hybrid aging delay model comprising both the PBTI and TDDB effects by analyzing the relationship between the aging propagation delay and the inherent delay of the gate. Experimental results on the logic gates under 45 nm, 32 nm, 22 nm, and 16 nm CMOS technologies show that the maximum error between the proposed model and the actual value is less than 2.5%, meanwhile the average error is about 1.5%.

关键词： Circuit aging positive biastemperature instability time-dependent dielectricbreakdown.

A novel selective fluorescent chemosensor for Cu(Ⅱ)

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Chinese Chemical Letters 2007年第11期18卷 1403-1406页

作者： mao xiang Wang xiang Ming Meng Man Zhou Zhu Qing xiang Guo Department of Chemistry University of Science and Technology of China Hefei 230026 China

A novel fluorescence enhancement Cu^2＋ chemosensor derived from coumarin was prepared. Emission study found that it exhibits evident Cu^2＋-arnplified fluorescence prior to Co^2＋, Pb^2＋, Mg^2＋, Mn^2＋, Ni^2＋, Zn^2＋, Fe^3＋, Ag^＋ and Cd^2＋, and the largest emission enhancement factor is about 9 at a ratio of 2：1 （chemosensor 1/Cu^2＋）.

关键词： Cu^2+ chemosensor Fluorescence 荧光性 Coumarin

Multi-class classification method for steel surface defects with feature noise

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Journal of Iron and Steel Research International 2021年第3期28卷 303-315页

作者： mao-xiang Chu Yao Feng Yong-hui Yang Xin Deng School of Electronic and Information Engineering University of Science and Technology LiaoningAnshan114051LiaoningChina

Defect classification is the key task of a steel surface defect detection *** current defect classification algorithms have not taken the feature noise into *** order to reduce the adverse impact of feature noise,an anti-noise multi-class classification method was proposed for steel surface *** the one hand,a novel anti-noise support vector hyper-spheres(ASVHs)classifier was *** N types of defects,the ASVHs classifier built N *** hyper-spheres were insensitive to feature and label *** the other hand,in order to reduce the costs of online time and storage space,the defect samples were pruned by support vector data description with parameter iteration adjustment *** the end,the ASVHs classifier was built with sparse defect samples set and auxiliary *** results show that the novel multi-class classification method has high efficiency and accuracy for corrupted defect samples in steel surface.

关键词： Steel surface defect Multi-class classification Anti-noise support vector hyper-sphere Parameter iteration adjustment Feature noise

Novel fluorescent chemosensor for Ag^+ based on coumarin fluorophore

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Chinese Chemical Letters 2008年第8期19卷 977-980页

作者： mao xiang Wang xiang Ming Meng Man Zhou Zhu Qing xiang Guo Department of Chemistry University of Science and Technology of China Hefei 230026 China

A novel chemosensor 1 （CS1） bearing one coumarin and two carbodithioate groups was synthesized and its fluorescent sensing behavior toward metal ions was investigated. Ag^＋ addition to a CH3COCH3/H2O （3：7, v：v） solution of CS1 gave a significantly quenched fluorescence. Other ions including Pb^2＋, Zn^2＋, Cu^2＋, Ca^2＋, Cd^2＋, Co^2＋, Mg^2＋, Mn^2＋, Hg^2＋, Ag^＋, Ni^2＋ induced no or much smaller spectral changes. This constitutes an ON-OFF Ag^＋-selective fluorescent chemosensor.

关键词： Ag^+ chemosensor Fluorescence PET Coumarin

Polycarbonate/Polypropylene/Fibrillar Silicate Ternary Nanocomposites: Morphology and Mechanical Properties

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Journal of Materials Science & Technology 2006年第1期22卷 87-92页

作者： xiang GAO Lixin mao Ming TIAN Liqun ZHANG Riguang JIN College of Materials Science and Engineering Beijing University of Chemical Technology Beijing 100029 China

Polycarbonate （pc）/polypropylene （pp）/silicate attapulgite （AT） ternary nanocomposites were first prepared via the two-step melt blending process. Phase structure of the ternary composites was characterized by transmission electron microscopy （TEM） and dynamic mechanical analysis （DMA）, in which the morphology of encapsulation of AT by PP in the PC matrix were observed. The mechanical properties of the ternary composites were investigated using the tensile tester and Izod impact tester. The results show that encapsulation of AT by PP in PC enhances the toughness of the matrix effectively and give the best tensile and impact strength.

关键词： Polycarbonate Polypropylene Attapulgite Morphology Property

Quantum Currents in the coset Space SU(2)/U(1)

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Communications in Theoretical Physics 2002年第1期37卷 59-62页

作者： Ding xiang-mao Hou Bo-Yu Zhao Liu Institute of Applied Mathematics Academy of Mathematics and System Sciences Academia Sinica P.O. Box 2734 Beijing 100080 China Institute of Modern Physics Northwest University Xi'an 710069 China

We propose a rational quantum deformed nonlocal currents in the homogeneous space SU(2)k/U(1), and in terms of it and a free boson field a representation for the Drinfeld currents of Yangian double at a general level k = c is obtained. In the classical limit h → 0, the quantum nonlocal currents become SU(2)k parafermion, and the realization of Yangian double becomes the parafermion realization of SU(2)k current algebra.

关键词：量子理论仿射李代数量子流 SU(2)/U(1)空间

Multi-class classification method for strip steel surface defects based on support vector machine with adjustable hyper-sphere

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Journal of Iron and Steel Research International 2018年第7期25卷 706-716页

作者： mao-xiang Chu Xiao-ping Liu Rong-fen Gong Jie Zhao School of Electronic and Information Engineering University of Science and Technology Liaoning Anshan 114051 Liaoning China Department of Electrical Engineering Lakehead University Thunder Bay P7B 5E1 ON Canada State Key Laboratory of Robotics and System (HIT) Harbin 150001 Heilongjiang China

Focusing on strip steel surface defects classification, a novel support vector machine with adjustable hyper-sphere （AHSVM） is formulated. Meanwhile, a new multi-class classification method is proposed. Originated from support vector data description, AHSVM adopts hyper-sphere to solve classification problem. AHSVM can obey two principles： the margin maximization and inner-class dispersion minimization. Moreover, the hyper-sphere of AHSVM is adjustable, which makes the final classification hyper-sphere optimal for training dataset. On the other hand, AHSVM is combined with binary tree to solve multi-class classification for steel surface defects. A scheme of samples pruning in mapped feature space is provided, which can reduce the number of training samples under the premise of classification accuracy, resulting in the improvements of classification speed. Finally, some testing experiments are done for eight types of strip steel surface defects. Experimental results show that multi-class AHSVM classifier exhibits satisfactory results in classification accuracy and efficiency.

关键词： Strip steel surface defect Multi-class classification Supporting vector machine Adjustable hyper-sphere

DLF-YOLOF:an improved YOLOF-based surface defect detection for steel plate

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Journal of Iron and Steel Research International 2024年第2期31卷 442-451页

作者： Guang-hu Liu mao-xiang Chu Rong-fen Gong Ze-hao Zheng School of Electronic and Information Engineering University of Science and Technology LiaoningAnshan114051LiaoningChina

Surface defects can affect the quality of steel *** methods based on computer vision are currently applied to surface defect detection of steel ***,their real-time performance and object detection of small defect are still *** improved object detection network based on You Only Look One-level Feature(YOLOF)is proposed to show excellent performance in surface defect detection of steel plate,called ***,the anchor-free detector is used to reduce the network ***,deformable convolution network and local spatial attention module are introduced into the feature extraction network to increase the contextual information in the feature ***,the soft non-maximum suppression is used to improve detection accuracy ***,data augmentation is performed for small defect objects during training to improve detection *** show the average precision and average precision for small objects are 42.7%and 33.5%at a detection speed of 62 frames per second on a single GPU,*** shows that DLF-YOLOF has excellent performance to meet the needs of industrial real-time detection.

关键词： Steel surface defects detection YOLOF Anchor-free detector Small object detection Real-time detection

On gl（2｜2）（2）k Current Superalgebra and Twisted Conformal Field Theory

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Communications in Theoretical Physics 2007年第1期47卷 69-77页

作者： DING xiang-mao WANG Gui-Dong WANG Shi-Kun Institute of Applied Mathematics Academy of Mathematics and Systems Science~ the Chinese Academy of Sciences P.O. Box 2734 Beijing 100080 China Graduate School of the Chinese Academy of Scisences Beijing 100049 China KLMM AMSS CAS Beijing 100080 China

Motivated by the recently discovered hidden symmetry of the type IIB Green-Schwarz superstring on certain background, the non-semisimple Kac-Moody twisted superalgebra gl（2｜2）（2）k is investigated by means of the vector coherent state method and boson-fermion realization. The free field realization of the twisted current superalgebra at general level k is constructed. The corresponding Conformai Field Theory （CFT） has zero central charge. According to the classification theory, this CFT is a nonunitary field theory. After projecting out a U（1） factor and an outer automorphism operator, we get the free field representation of psl（2｜2）（2）k, which is the a/gebra of gl（2｜2）（2）k modulo the Z4-outer automorphism, the CFT has central charge -2.

关键词： superalgebra differential operator realization free field realization conformal field theory