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The Proportional Hazards Model for Multiple Type Recurrent Gap Times

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Acta Mathematicae Applicatae Sinica 2016年第1期32卷 221-230页

作者： ji-cai liu Huan-bin liu Ri-quan ZHANG Department of Statistics East China Normal UniversityShanghai 200241China College of Mathematics and Computer Science Huanggang Normal University Huangzhou 438000China Department of Mathematics Shanxi Datong UniversityDatong 037009China

Recurrent events data and gap times between recurrent events are frequently encountered in many clinical and observational studies,and often more than one type of recurrent events is of *** this paper,we consider a proportional hazards model for multiple type recurrent gap times data to assess the effect of covaxiates on the censored event processes of *** estimating equation approach is used to obtain the estimators of regression coefficients and baseline cumulative hazard *** examine asymptotic properties of the proposed *** sample properties of these estimators are demonstrated by simulations.

关键词： proportional hazards model estimating equation multiple type recurrent events gap times semiparametric inference

Bayesian Regularized Regression Based on Composite Quantile Method

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Acta Mathematicae Applicatae Sinica 2016年第2期32卷 495-512页

作者： Wei-hua ZHAO Ri-quan ZHANG Ya-zhao LU ji-cai liu School of Statistics East China Normal UniversityShanghai 200241China School of Science NanTong UniversityNanTong 226007China Department of Mathematics Shanxi Datong UniversityDatong 037009China

Recently, variable selection based on penalized regression methods has received a great deal of attention, mostly through frequentist＇s models. This paper investigates regularization regression from Bayesian perspective. Our new method extends the Bayesian Lasso regression （Park and Casella, 2008） through replacing the least square loss and Lasso penalty by composite quantile loss function and adaptive Lasso penalty, which allows different penalization parameters for different regression coefficients. Based on the Bayesian hierarchical model framework, an efficient Gibbs sampler is derived to simulate the parameters from posterior distributions. Furthermore, we study the Bayesian composite quantile regression with adaptive group Lasso penalty. The distinguishing characteristic of the newly proposed method is completely data adaptive without requiring prior knowledge of the error distribution. Extensive simulations and two real data examples are used to examine the good performance of the proposed method. All results confirm that our novel method has both robustness and high efficiency and often outperforms other approaches.

关键词： composite quantile regression variable selection Lasso adaptive Lasso, Gibbs sampler

Optical power limiting of ultrashort hyper-Gaussian pulses in cascade three-level system

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Chinese Physics B 2018年第10期27卷 357-361页

作者： ji-cai liu Fen-Fen Guo Ya-Nan Zhao Xing-Zhe Li Department of Mathematics and Physics North China Electric Power UniversityBeijing 102206China

Propagation of strong femtosecond hyper-Gaussian pulses in a cascade three-level molecular system is studied by solving numerically the Maxwell–Bloch equations by the iterative predictor-corrector finite-difference time-domain *** power limiting behavior induced by strong nonlinear two-photon absorption is observed for different orders of the femtosecond hyper-Gaussian pulses. Pulses of a higher order temporal profile are found to have a wider power range of optical limiting but a larger output saturation intensity. Both the output saturation value and the damage threshold of optical power limiting decrease with pulse duration increasing. The decrease of the pulse area along the pulse propagation is much slower than that obtained from the two-photon area theorem due to invalidity of the slowly varying amplitude approximation and the monochromatic field hypothesis.

关键词： optical power limiting two-photon absorption ultrashort hyper-Gaussian pulse cascade three-level system

Administrative Methods on Finished Vehicles Featuring Import Parts——promulgation, operation and trade disputes caused

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中国汽车（英文版） 2008年第6期 9-10页

作者： ji Xuehong, cai Guoqin, liu Di

I Enactment of the administrative methods In the end of 2001, China became a member of the World Trade Organization and cancelled some limits on vehicle import. As tariffs of auto parts became lower than that of complete vehicles, partial joint ventures began assembling complete vehicles KD parts and a lot of KD parts came in then.

关键词： Administrative import promulgation administrative

Anomalous plasmon coupling and Fano resonance under structured light

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Photonics Research 2023年第8期11卷 1423-1430页

作者： DA-jiE YANG SONG-jiN IM HAI-WEN HUANG CHOL-SONG RI KUM-DONG KIM KIL-SONG SONG ji-cai liu QU-QUAN WANG Mathematics and Physics Department North China Electric Power UniversityBeijing 102206China Hebei Key Laboratory of Physics and Energy Technology North China Electric Power UniversityBaoding 071000China Department of Physics Kim Il Sung University02-381-4410 PyongyangRepublic of Korea Department of Physics Southern University of Science and TechnologyShenzhen 518055China

Structured light carrying orbital angular momentum(OAM)opens up a new physical dimension for studying light–matter *** this,the complex fields created by OAM beams still remain largely unexplored in terms of their effects on surface *** paper presents a revelation of anomalous plasmon excitations in single particles and plasmon couplings of neighboring nanorods under OAM beams,which are forbidden using non-OAM *** plasmon excitation of single nanoparticles is determined both by photon spin angular momentum(SAM)and OAM and influenced by the locations of the ***,when SAM and OAM are equal in magnitude and opposite in direction,a pure plasmon excitation along light propagation direction is *** plasmon dipoles show end-to-end antibonding coupling and side-by-side bounding coupling,which are the opposite of the typical ***,we observe Fano resonance with a nanorod dimer:one aligned along light propagation direction acting as the bright mode and the other aligned along the global polarization direction of light acting as the dark mode,which is the opposite of the usual plasmonic Fano *** taking advantage of the unique property of the OAM source,this investigation presents a novel way to control and study surface plasmons,and the research of plasmon behavior with OAM would open new avenues for controlling electromagnetic waves and enriching the spectroscopies with more degrees of freedom.

关键词： polarization coupling plasmon

Laser shaping and optical power limiting of pulsed Laguerre–Gaussian laser beams of high-order radial modes in fullerene C60

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Chinese Physics B 2023年第2期32卷 273-280页

作者：李杰管文慧袁烁赵亚男孙玉萍刘纪彩 Department of Mathematics and Physics North China Electric Power UniversityBeijing 102206China School of Physics and Optoelectronic Engineering Shandong University of TechnologyZibo 255049China

We study the strong nonlinear optical dynamics of nanosecond pulsed Laguerre–Gaussian laser beams of high-order radial modes with zero orbital angular momentum propagating in the fullerene C60molecular medium. It is found that the spatiotemporal profile of the incident pulsed Laguerre–Gaussian laser beam is strongly reshaped during its propagation in the C60molecular medium. The centrosymmetric temporal profile of the incident pulse gradually evolves into a noncentrosymmetric meniscus shape, and the on-axis pulse duration is clearly depressed. Furthermore, the field intensity is distinctly attenuated due to the field-intensity-dependent reverse saturable absorption, and clear optical power limiting behavior is observed for different orders of the input pulsed Laguerre–Gaussian laser beams before the takeover of the saturation effect;the lower the order of the Laguerre–Gaussian beam, the lower the energy transmittance.

关键词： pulsed Laguerre–Gaussian laser beams high-order radial mode optical power limiting reverse saturable absorption

High‑Entropy Electrode Materials:Synthesis,Properties and Outlook

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Nano-Micro Letters 2025年第1期17卷 472-506页

作者： Dongxiao Li Chang liu Shusheng Tao jieming cai Biao Zhong jie Li Wentao Deng Hongshuai Hou Guoqiang Zou Xiaobo ji College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083People’s Republic of China School of Chemistry and Chemical Engineering Hunan Institute of EngineeringXiangtan 411104People’s Republic of China

High-entropy materials represent a new category of high-performance materials,first proposed in 2004 and extensively investigated by researchers over the past two *** definition of high-entropy materials has continuously *** the last ten years,the discovery of an increasing number of high-entropy materials has led to significant advancements in their utilization in energy storage,electrocatalysis,and related domains,accompanied by a rise in techniques for fabricating high-entropy electrode ***,the research emphasis has shifted from solely improving the performance of high-entropy materials toward exploring their reaction mechanisms and adopting cleaner preparation ***,the current definition of high-entropy materials remains relatively vague,and the preparation method of high-entropy materials is based on the preparation method of single metal/low-or medium-entropy *** should be noted that not all methods applicable to single metal/low-or medium-entropy materials can be directly applied to high-entropy *** this review,the definition and development of high-entropy materials are briefly ***,the classification of high-entropy electrode materials is presented,followed by a discussion of their applications in energy storage and catalysis from the perspective of synthesis ***,an evaluation of the advantages and disadvantages of various synthesis methods in the production process of different high-entropy materials is provided,along with a proposal for potential future development directions for high-entropy materials.

关键词： High-entropy Energy storage Electrode materials

SensFL:Privacy-Preserving Vertical Federated Learning with Sensitive Regularization

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Computer Modeling in Engineering & Sciences 2025年第1期142卷 385-404页

作者： Chongzhen Zhang Zhichen liu Xiangrui Xu Fuqiang Hu jiao Dai Baigen cai Wei Wang School of Automation and Intelligence Beijing Jiaotong UniversityBeijing100044China Shuohuang Railway Development Co. Ltd.National Energy GroupCangzhou062350China Beijing Key Laboratory of Security and Privacy in Intelligent Transportation School of Computer Science and TechnologyBeijing Jiaotong UniversityBeijing100044China

In the realm of Intelligent Railway Transportation Systems,effective multi-party collaboration is crucial due to concerns over privacy and data *** Federated Learning(VFL)has emerged as a promising approach to facilitate such collaboration,allowing diverse entities to collectively enhance machine learning models without the need to share sensitive training ***,existing works have highlighted VFL’s susceptibility to privacy inference attacks,where an honest but curious server could potentially reconstruct a client’s raw data from embeddings uploaded by the *** vulnerability poses a significant threat to VFL-based intelligent railway transportation *** this paper,we introduce SensFL,a novel privacy-enhancing method to against privacy inference attacks in ***,SensFL integrates regularization of the sensitivity of embeddings to the original data into the model training process,effectively limiting the information contained in shared *** reducing the sensitivity of embeddings to the original data,SensFL can effectively resist reverse privacy attacks and prevent the reconstruction of the original data from the *** experiments were conducted on four distinct datasets and three different models to demonstrate the efficacy of *** results show that SensFL can effectively mitigate privacy inference attacks while maintaining the accuracy of the primary learning *** results underscore SensFL’s potential to advance privacy protection technologies within VFL-based intelligent railway systems,addressing critical security concerns in collaborative learning environments.

关键词： Vertical federated learning privacy defenses

Manufacture the conducting polymer with light

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Science China Chemistry 2025年第01期 8-9页

作者： Yang Li Tianyu Li Yan ji Baoguang liu College of Electronic and Optical Engineering & College of Flexible Electronics (Future Technology) Nanjing University of Posts & Telecommunications

Poly(3,4-ethylenedioxythiophene) (PEDOT), heralded as the “king” of conducting polymers, is esteemed in bioelectronics for its mixed electronic and ionic conductivity, mechanical properties compatible with biological tissues, tunable healing ability and stability in diverse environments [1]. Based on additive manufacturing of three-dimensional structures,PEDOT realizes the implementation in the efficient production of flexible bioelectronics, the construction of intricate electrode-neural implantations, and the development of smart brain-computer-interfaces [2].

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