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Acta Mathematicae Applicatae Sinica 2018年第3期34卷 451-468页

作者： cong-cong xu Zuo-liang xu School of Information Renmin University of China Beijing 100872 China Department of Basic Course Shijiazhuang Institute of Railway Technology Shijiazhuang 050041 China

We use an actuarial approach to estimate the valuation of the reload option for a non-tradable risk asset under the jump-diffusion processes and Hull-White interest rate. We verify the validity of the actuarial approach to the European vanilla option for non-tradable assets. The formulas of the actuarial approach to the reload option are derived from the fair premium principle and the obtained results are arbitrage. Numerical experiments are conducted to analyze the effects of different parameters on the results of valuation as well as their differences from those obtained by the no-arbitrage approach. Finally, we give the valuations of the reload options under different parameters.

关键词： Non-tradable assets reload option actuarial approach jump-diffusion processes stochastic inter-est rate

Venturi-type fluidic sampler for liquid-solid mixtures

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Particuology 2012年第3期10卷 283-291页

作者： cong xu Binbin Liu Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084China

Static-type samplers are required for sampling corrosive, toxic, high-temperature, or radioactive liquid-solid fluids. We have designed a compact reverse flow diverter pumping system for transferring liquid-solid mixtures. In accordance with the Venturi principle, an acceptable volume of liquid-solid fluid is automatically collected into a sampling bottle. The effects of sampling needle sizes, sectional area of the T-section, solid concentration, and liquid viscosity on the performance of fluidic samplers were experi- mentally investigated. The sample volume increased upon the reduction of the sampling needle length and the increase of the sectional area of the T-section, but decreased with the increase of solid concentration and liquid viscosity. Unbiased samples of acceptable volume were produced by the proposed fluidic sampler, even at 10.21 mPa s liquid viscosity, 35 wt% solid concentration, and 6.74 m sampling height.

关键词： SamplerLiquid-solid Reverse flow diverterVenturi principle Maintenance free

Bayesian track-before-detect algorithm for nonstationary sea clutter

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Journal of Systems Engineering and Electronics 2021年第6期32卷 1338-1344页

作者： xu cong HE Zishu LIU Haicheng LI Yadan Department of Information and Communication University of Electronic Science and Technology of ChinaChengdu 610051China Department of Electrical and Information Engineering Heilongjiang Institute of EngineeringHarbin 150026China College of Economics and Management University of Chinese Academy of SciencesBeijing 100049China

Radar detection of small targets in sea clutter is a particularly demanding task because of the nonstationary characteristic of sea *** track-before-detect(TBD)filter is an effective way to increase the signal-to-clutter ratio(SCR),thus improving the detection performance of small targets in sea *** cope with the nonstationary characteristic of sea clutter,an easily-implemented Bayesian TBD filter with adaptive detection threshold is proposed and a new parameter estimation method is devised which is integrated into the detection *** detection threshold is set according to the parameter estimation result under the framework of information *** detection of closely spaced targets,those within the same range cell as the one under test are treated as contribution to sea clutter,and a successive elimination method is adopted to detect *** results prove the effectiveness of the proposed algorithm in detecting small targets in nonstationary sea clutter,especially closely spaced ones.

关键词： small target track-before-detect(TBD) nonstationary sea clutter closely spaced target

Analysis of a Shil’nikov Type Homoclinic Bifurcation

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Acta Mathematica Sinica,English Series 2018年第5期34卷 901-910页

作者： Yan cong xu Xing Bo LIU Department of Mathematics Hangzhou Normal University Hangzhou 310036 P. R. China Department of Mathematics Shanghai Key Laboratory of PMMP East China Normal University Shanghai 200241 P. R. China

The bifurcation associated with a homoclinic orbit to saddle-focus including a pair of pure imaginary eigenvalues is investigated by using related homoclinie bifurcation theory. It is proved that, in a neighborhood of the homoclinic bifurcation value, there are countably infinite saddle-node bifurcation values, period-doubling bifurcation values and double-pulse homoclinic bifurcation values. Also, accompanied by the Hopf bifurcation, the existence of certain homoclinie connections to the periodic orbit is proved.

关键词： Homoclinic bifurcation Hopf bifurcation Poincare map

New Oscillation Criteria for Second Order Linear Matrix Differential Equations with Damping

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Acta Mathematica Sinica,English Series 2008年第6期24卷 925-936页

作者： Yan cong xu De Ming ZHU Department of Mathematics East China Normal University Shanghai 200062 P. R. China

By using the positive linear functional and the monotone subhomogeneous functional, including the general means and Riccati technique, some new oscillation criteria are established for the second order linear matrix differential system （P（t）X＇（t））＇＋ R（t）X＇（t）＋ Q（t）X（t） =0, t ≥ to 〉 0 where P（t）, R（t）, Q（t） are n × n real continuous matrix functions, P（t） and R（t） are commutative. Theresults improve and generalize those given in some previous papers, which can be seen by the examples given at the end of this paper.

关键词： matrix differential equation oscillation damping

Tighter sum uncertainty relations via(α,β,γ)weighted Wigner–Yanase–Dyson skew information

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Communications in Theoretical Physics 2024年第3期76卷 91-99页

作者： cong xu Zhaoqi Wu Shao-Ming Fei School of Mathematical Sciences Capital Normal UniversityBeijing 100048China Department of Mathematics Nanchang UniversityNanchang 330031China Max-Planck-Institute for Mathematics in the Sciences 04103 LeipzigGermany

We establish tighter uncertainty relations for arbitrary finite observables via(α,β,γ)weighted Wigner–Yanase–Dyson((α,β,γ)WWYD)skew *** results are also applicable to the(α,γ)weighted Wigner–Yanase–Dyson((α,γ)WWYD)skew information and the weighted Wigner–Yanase–Dyson(WWYD)skew *** also present tighter lower bounds for quantum channels and unitary channels via(α,β,γ)modified weighted Wigner–Yanase–Dyson((α,β,γ)MWWYD)skew *** examples are provided to illustrate the tightness of our uncertainty relations.

关键词： quantum channels (α,β,γ)WWYD skew information (α,β,γ)MWWYD skew information uncertainty relations

Power-efficient dual-edge implicit pulse-triggered flip-flop with an embedded clock-gating scheme

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Frontiers of Information Technology & Electronic Engineering 2016年第9期17卷 962-972页

作者： Liang GENG Ji-zhong SHEN cong-yuan xu College of Information Science & Electronic Engineering Zhejiang University

A novel dual-edge implicit pulse-triggered flip-flop with an embedded clock-gating scheme(DIFF-CGS) is proposed, which employs a transmission-gate-logic(TGL) based clock-gating scheme in the pulse generation stage. This scheme conditionally disables the inverter chain when the input data are kept unchanged, so redundant transitions of delayed clock signals and internal nodes of the latch are all eliminated, leading to low power efficiency. Based on SMIC 65 nm technology, extensive post-layout simulation results show that the proposed DIFF-CGS gains an improvement of 41.39% to 56.21% in terms of power consumption, compared with its counterparts at 10% data-switching activity. Also, full-swing operations in both implicit pulse generation and the static latch improve the robustness of the design. Thus, DIFF-CGS is suitable for low-power applications in very-large-scale integration(VLSI) designs with low data-switching activities.

关键词： Low power Flip-flop Implicit Clock-gating scheme Dual-edge

BACH： A Bandwidth-Aware Hybrid Cache Hierarchy Design with Nonvolatile Memories

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Journal of Computer Science & Technology 2016年第1期31卷 20-35页

作者： Jishen Zhao cong xu Tao Zhang Yuan Xie Department of Computer Engineering University of California at Santa Cruz Santa Cruz CA 95064 U.S.A. Hewlet-Packard Labs Palo Alto CA 94304 U.S.A. NVIDIA Corporation Santa Clara CA 95050 U.S.A. Department of Electrical and Computer Engineering University of California at Santa Barbara Santa Barbara CA 93106 U.S.A.

Limited main memory bandwidth is becoming a fundamental performance bottleneck in chipmultiprocessor （CMP） design. Yet directly increasing the peak memory bandwidth can incur high cost and power consumption. In this paper, we address this problem by proposing a memory, a bandwidth-aware reconfigurable cache hierarchy, BACH, with hybrid memory technologies. Components of our BACH design include a hybrid cache hierarchy, a reconfiguration mechanism, and a statistical prediction engine. Our hybrid cache hierarchy chooses different memory technologies with various bandwidth characteristics, such as spin-transfer torque memory （STT-MRAM）, resistive memory （ReRAM）, and embedded DRAM （eDRAM）, to configure each level so that the peak bandwidth of the overall cache hierarchy is optimized. Our reconfiguration mechanism can dynamically adjust the cache capacity of each level based on the predicted bandwidth demands of running workloads. The bandwidth prediction is performed by our prediction engine. We evaluate the system performance gain obtained by BACH design with a set of multithreaded and multiprogrammed workloads with and without the limitation of system power budget. Compared with traditional SRAM-based cache design, BACH improves the system throughput by 58% and 14% with multithreaded and multiprogrammed workloads respectively.

关键词： memory bandwidth hybrid cache reconfigurable cache nonvolatile memory

Crosslinked chitosan nanofiber mats fabricated by one-step electrospinning and ion-imprinting methods for metal ions adsorption

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Science China Chemistry 2016年第1期59卷 95-105页

作者： Yan Li Jie Zhang cong xu Yongfeng Zhou School of Materials Science and Engineering Tongji University School of Chemistry and Chemical Engineering Shanghai Jiao Tong University

The Pb(Ⅱ)ion-imprinting electrospun crosslinked chitosan nanofiber mats were fabricated by one-step electrospinning and ion-imprinting methods and their application as adsorbents for metal ions was also *** resulting chitosan nanofiber mats were characterized by scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FTIR),X-ray photoelectron spectroscopy(XPS)and thermal gravimetric analysis(TGA).The Pb(Ⅱ)ion-imprinting electrospun crosslinked chitosan nanofiber mats were used as adsorbents for the removal of Pb(Ⅱ)ions from aqueous or acid *** effects of p H values,contact time,content of crosslinker(glutaraldehyde)on Pb(Ⅱ)ions adsorption were *** results indicated that the Pb(Ⅱ)ion-imprinting electrospun crosslinked chitosan nanofiber mats had the highest adsorption capacity of 110.0 mg/g at p H *** kinetic study demonstrated that the adsorption of Pb(Ⅱ)ions followed the pseudo-second-order *** equilibrium isotherm data showed that the Langmuir model was the most suitable for predicting the adsorption isotherm of the studied *** Pb(Ⅱ)ion-imprinting electrospun crosslinked chitosan nanofiber mats had good adsorption selectivity,which illustrates the equilibrium adsorption capacity in the order of Pb(Ⅱ)>Cu(Ⅱ)>Zn(Ⅱ)>Cd(Ⅱ)>Ni(Ⅱ).The Pb(Ⅱ)ion-imprinting electrospun crosslinked chitosan nanofiber mats were stable and had good reuse ability.

关键词： chitosan one-step electrospinning ion-imprinting Pb(II) ion adsorption

Delivery systems for siRNA drug development in cancer therapy

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Asian Journal of Pharmaceutical Sciences 2015年第1期10卷 1-12页

作者： cong-fei xu Jun Wang School of Life Sciences and Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of ChinaHefeiAnhui 230027China

Since the discovery of the Nobel prize-winning mechanism of RNA interference(RNAi)ten years ago,it has become a promising drug target for the treatment of multiple diseases,including *** have already been some successful applications of siRNA drugs in the treatment of age-related macular degeneration and respiratory syncytial virus ***,significant barriers still exist on the road to clinical applications of siRNA drugs,including poor cellular uptake,instability under physiological conditions,off-target effects and possible *** successful application of siRNA for cancer therapy requires the development of clinically suitable,safe and effective drug delivery ***,we review the design criteria for siRNA delivery systems and potential siRNA drug delivery systems for cancer therapy,including chemical modifications,lipidbased nanovectors,polymer-mediated delivery systems,conjugate delivery systems,and others.

关键词： RNA interference Cancer therapy Delivery systems siRNA