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A Cross Attention Transformer-Mixed Feedback Video Recommendation Algorithm Based on DIEN

Computers, Materials & Continua 2025年第1期82卷 977-996页

作者： jianwei zhang Zhishang Zhao Zengyu Cai Yuan Feng Liang Zhu Yahui Sun College of Software Engineering Zhengzhou University of Light IndustryZhengzhou450000China Faculty of Information Engineering Xuchang Vocational Technical CollegeXuchang461000China College of Computer Science and Technology Zhengzhou University of Light IndustryZhengzhou450000China College of Electronics and Information Zhengzhou University of Light IndustryZhengzhou450000China

The rapid development of short video platforms poses new challenges for traditional recommendation *** systems typically depend on two types of user behavior feedback to construct user interest profiles:explicit feedback(interactive behavior),which significantly influences users’short-term interests,and implicit feedback(viewing time),which substantially affects their long-term ***,the previous model fails to distinguish between these two feedback methods,leading it to predict only the overall preferences of users based on extensive historical behavior ***,it cannot differentiate between users’long-term and shortterm interests,resulting in low accuracy in describing users’interest states and predicting the evolution of their *** paper introduces a video recommendationmodel calledCAT-MFRec(CrossAttention Transformer-Mixed Feedback Recommendation)designed to differentiate between explicit and implicit user feedback within the DIEN(Deep Interest Evolution Network)*** study emphasizes the separate learning of the two types of behavioral feedback,effectively integrating them through the cross-attention ***,it leverages the long sequence dependence capabilities of Transformer technology to accurately construct user interest profiles and predict the evolution of user *** results indicate that CAT-MF Rec significantly outperforms existing recommendation methods across various performance *** advancement offers new theoretical and practical insights for the development of video recommendations,particularly in addressing complex and dynamic user behavior patterns.

关键词： Video recommendation user interest cross-attention transformer

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Research on data load balancing technology of massive storage systems for wearable devices

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Digital Communications and Networks 2022年第2期8卷 143-149页

作者： Shujun Liang Jing Cheng jianwei zhang Software Engineering College Zhengzhou University of Light IndustryZhengzhou450000China Engineering Training Center Zhengzhou University of Light Industry Zhengzhou450000China

Because of the limited memory of the increasing amount of information in current wearable devices,the processing capacity of the servers in the storage system can not keep up with the speed of information growth,resulting in low load balancing,long load balancing time and data processing ***,a data load balancing technology is applied to the massive storage systems of wearable devices in this *** first analyze the object-oriented load balancing method,and formally describe the dynamic load balancing issues,taking the load balancing as a mapping ***,the task of assigning each data node and the request of the corresponding data node’s actual processing capacity are *** data is allocated to the corresponding data storage node to complete the calculation of the comprehensive weight of the data storage *** to the load information of each data storage node collected by the scheduler in the storage system,the load weight of the current data storage node is calculated and *** data load balancing of the massive storage system for wearable devices is *** experimental results show that the average time of load balancing using this method is 1.75h,which is much lower than the traditional *** results show the data load balancing technology of the massive storage system of wearable devices has the advantages of short data load balancing time,high load balancing,strong data processing capability,short processing time and obvious application.

关键词： Wearable device Massive data Data storage system Load balancing Weigh

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In-hand haptic perception in dexterous manipulations

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Science China(Information Sciences) 2014年第12期57卷 65-75页

作者： HE JunHu zhang jianwei Faculty of Mathematics Informatics and Natural Sciences Department Informatics University of Hamburg

Dexterous in-hand manipulation with multi-finger robotic hands is a hot topic in *** many famous multi-finger robotic hands have been *** a lot of research has been done on them;in-hand manipulation is still a *** of its issues lies in the uncertainty of interaction *** this paper we research robot-object interaction from a novel angle called haptic *** method helps robots acquire the ability to explore the robot-object *** in-hand manipulation tasks,haptic exploration is a process where the robot pushes on in-hand objects slightly in different directions,and meanwhile perceives the haptic feedback to estimate the interaction *** this paper a new single finger push model is proposed for analyzing the haptic feedback,which is similar to traditional impedance control of robot *** this model the stiffness of fingers,the deformation on contact surface,and the change of object’s pos(position and attitude)are ***,a push resistance is given to describe the haptic feedback acquired from a slight ***,real robotic experiments are conducted to verify the feasibility of proposed method.

关键词： in-hand manipulation multi-finger robotic hands dexterous manipulation haptic perception haptic feedback

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Analysis and Design of Asymmetric Oscillation for Caterpillar-Like Locomotion

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Journal of Bionic Engineering 2015年第2期12卷 190-203页

作者： Guoyuan Li Wei Li jianwei zhang Houxiang zhang Faculty of Maritime Technology and Operations Aalesund University College Aalesund 6009 Norway Department of Computer Science University of Hamburg Hamburg 22527 Germany

Caterpillar crawling is distinct from that of other limbless animals. It is simple but efficient. This paper presents a novel mechanism to duplicate the movement to a modular caterpillar-like robot. First, how caterpillars move in nature is investigated and analyzed systematically. Two key locomotive properties are abstracted from the body shape of caterpillars during crawling. Then, based on a morphological mapping, a hypothesis of asymmetric oscillation with a ratio of two is proposed, followed by a thorough analysis of the kinematics of the caterpillar-like robot. The asymmetric oscillating mechanism is proved capable of generating stable caterpillar-like locomotion. Next, taking advantage of the two locomotive properties and the hypothesis, a new Central Pattern Generator （CPG） model is designed as the controller of the robot. The model can not only generate the signal as expected, but also provide explicit control parameters for online modulation. Finally, simulation and on-site experiments are carried out. The results confirm that the proposed method is effective for caterpillar-like locomotion.

关键词： asymmetric oscillation kinematic analysis central pattern generator caterpillar-like locomotion

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Hierarchical Bayesian Calibration and On-line Updating Method for Influence Coefficient of Automatic Dynamic Balancing Machine

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Chinese Journal of Mechanical Engineering 2009年第6期22卷 876-882页

作者： zhang Jian WU jianwei MA Zhiyong Mechanical Design Institute Zhejiang University Hangzhou 310027 China

Measurement error of unbalance＇s vibration response plays a crucial role in calibration and on-line updating of influence coefficient（IC）. Focusing on the two problems that the moment estimator of data used in calibration process cannot fulfill the accuracy requirement under small sample and the disturbance of measurement error cannot be effectively suppressed in updating process, an IC calibration and on-line updating method based on hierarchical Bayesian method for automatic dynamic balancing machine was proposed. During calibration process, for the repeatedly-measured data obtained from experiments with different trial weights, according to the fact that measurement error of each sensor had the same statistical characteristics, the joint posterior distribution model for the true values of the vibration response under all trial weights and measurement error was established. During the updating process, information obtained from calibration was regarded as prior information, which was utilized to update the posterior distribution of IC combined with the real-time reference information to implement online updating. Moreover, Gibbs sampling method of Markov Chain Monte Carlo（MCMC） was adopted to obtain the maximum posterior estimation of parameters to be estimated. On the independent developed dynamic balancing testbed, prediction was carried out for multiple groups of data through the proposed method and the traditional method respectively, the result indicated that estimator of influence coefficient obtained through the proposed method had higher accuracy; the proposed updating method more effectively guaranteed the measurement accuracy during the whole producing process, and meantime more reasonably compromised between the sensitivity of IC change and suppression of randomness of vibration response.

关键词： influence coefficient hierarchical Bayesian calibration online updating dynamic balancing Markov Chain Monte Carlo(MCMC)

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Gained switching-based fuzzy sliding mode control for a discrete-time underactuated robotic system with uncertainties

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Frontiers of Mechanical Engineering 2021年第2期16卷 353-362页

作者： Hui LI Ruiqin LI jianwei zhang School of Mechanical Engineering North University of ChinaTaiyuan 030051China Department of Mining Engineering Lvliang UniversityLvliang 033001China Department of Informatics University of HamburgHamburg 22527Germany

This study proposes a gained switching-based discrete-time sliding mode control method to address the chattering issue in disturbed discrete-time systems, which suffer from various unknown uncertainties. Through the new structure of the designed reaching law, the proposed method can effectively increase the convergence speed while guaranteeing chattering-free control. The performance of controlling underactuated robotic systems can be further improved by the adoption of fuzzy logic to perform adaptive online hyper-parameter tuning. In addition, an underactuated robotic system with uncertainties is studied to validate the effectiveness of the proposed reaching law. Results reveal the dynamic performance and robustness of the proposed reaching law in the studied system and prove the proposed method’s superiority over other state-of-the-art methods.

关键词： sliding-mode control robot control discrete-time uncertain systems fuzzy logic

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An Approach for Adaptive Limbless Locomotion Using a CPG-Based Reflex Mechanism

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Journal of Bionic Engineering 2014年第3期11卷 389-399页

作者： Guoyuan Li Houxiang zhang jianwei zhang Hans Petter Hildre Faculty of Maritime Technology and Operations Aalesund University College Aalesund 6009 Norway Department of Computer Science University of Hamburg Hamburg 22527 Germany

Animals＇ free movement in natural environments has attracted many researchers to explore control methods for bio-inspired robots. This paper presents a novel reflex mechanism based on a Central Pattern Generator （CPG） for adaptive locomotion of limbless robots. First, inspired by the concept of reflex arc, the reflex mechanism is designed on a connectionist CPG model. Since the CPG model inspired by the spinal cord of lampreys is developed at the neuron level, it provides a possible natural solution for sensory reflex integration. Therefore, sensory neurons that bridge the external stimuli and the CPG model, together with the concept of reflex arc, are utilized for designing the sensory reflex mechanism. Then, a border reflex and a body reflex are further developed and applied on the ends and the middle part of a limbless robot, respectively. Finally, a ball hitting scenario and a corridor passing scenario are designed to verify the proposed method. Results of simulations and on-site experiments show the feasibility and effectiveness of the reflex mechanism in realizing fast response and adaptive limbless locomotion.

关键词： sensory reflex mechanism reflex arc central pattern generator limbless locomotion

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Determination of the Fracture Toughness of Glasses via Scratch Tests with a Vickers Indenter

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Acta Mechanica Solida Sinica 2022年第1期35卷 129-138页

作者： Haitao Liu jianwei zhang Minghao Zhao Chunsheng Lu lSchool of Mechanics and Safety Engineering Zhengzhou UniversityZhengzhou 450001China School of Mechanical and Power Engineering Zhengzhou UniversityZhengzhou 450001China Henan Key Engineering Laboratory for Anti-fatigue Manufacturing Technology Zhengzhou 450001China School of Civil and Mechanical Engineering Curtin UniversityPerth 6845Western AustraliaAustralia

Fracture toughness is an important index in safety evaluation for materials and *** convenient and accurate characterization has attracted extensive *** small specimens,traditional testing methods of fracture toughness are not suitable due to limitations in sample size and *** this work,a new formula is proposed to determine the fracture toughness of glasses using scratch tests with a Vickers indenter based on dimensional analysis and finite element *** toughness of glasses could be calculated with elastic modulus,crack depth of scratched materials and normal force applied during the scratch *** effects of plastic deformation and interfacial friction between the Vickers indenter and scratched materials are considered,and the crack shape is consistent with experimental *** proposed formula is verified by comparing the fracture toughness of soda-lime and borosilicate glasses obtained from scratch tests with those obtained via indentation *** work provides an alternative method to determine the fracture toughness of glass materials.

关键词： Scratch test Fracture toughness Glass Dimensional analysis Finite element analysis

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Design and voice‐based control of a nasal endoscopic surgical robot

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CAAI Transactions on Intelligence Technology 2021年第1期6卷 123-131页

作者： Yucheng He Zhen Deng jianwei zhang Department of Mechanical and Automation Engineering Chinese University of Hong KongHong KongChina Department of Informatics University of HamburgHamburgGermany

In traditional nasal surgery,surgeons are prone to fatigue and jitter by holding the endoscope for a long‐*** complex operations require assistant surgeon to assist with holding the *** address the above problems,the authors design a remote centre of motion based nasal robot,and propose a voice‐based robot control ***,through the operation space analysis of nasal surgery,the design scheme of the robot based on RCM mechanism is *** this basis,the design parameters of the robot are analysed to complete the entire design of ***,considering that the surgeon's hands are occupied by surgical instruments during complex surgical operations,a voice‐based robot control method is *** method obtains direction instructions from surgeons by analysing the movement of the endoscopic ***,a commercial speech recognition interface is used to realise the offline grammar controlwords lib compatible with both Chinese and English,and the overall strategy of robot control is ***,an experimental platform for virtual robot control is established,and the voice‐based robot control experiment is *** results show that the proposed voice‐based control method is feasible,and it provides guidance for the subsequent development and control of the actual robot system.

关键词： robot nasal operations

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Estimation of thermophysical properties of solid propellants based on particle packing model

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Science China(Technological Sciences) 2013年第12期56卷 3055-3069页

作者： zhang jianwei ZHI ShiJun SUN Bing School of Astronautics Beijing University of Aeronautics and Astronautics China Airborne Missile Academy

A method for the estimation of thermophysical properties of two-and multi-phase solid propellants is proposed in this *** theoretical solutions for thermal conductivity and specific heat of a homogeneous solid propellant cell in the transient thermal conductivity process are deduced on the condition that one boundary of the cell is heated while others are adiabatic.A homogenization theory and the finite element method are employed to compute the mean temperature and heat flux of a representative volume element(RVE).According to the mean results and the theoretical solutions,the effective thermal conductivity and specific heat of solid propellant can be estimated.A packing algorithm,considering the solid particles(ammonium perchlorate(AP)or aluminum)as spheres or discs,is used to match the size distribution and volume fraction of solid propellants,and some mesoscopic models of two-phase and three-phase solid propellants are *** to the estimation theory proposed in this paper,the effective thermal conductivity and specific heat of solid propellants are *** effect of AP or Al volume fraction is also discussed in this paper.

关键词： solid propellants thermal conductivity specific heat mesomechanics finite element method

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