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促进TPACK知识提升的高中教师技术应用能动性研究 被引量:11
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作者 董艳 和静宇 +1 位作者 司刊的尔 徐唱 《中国电化教育》 CSSCI 北大核心 2019年第10期117-123,共7页
能动性(Agency)作为促进教师专业发展的内在变量,近年来受到教师教育领域的高度关注。信息时代,技术是教师发挥能动性的一种主要工具。在此基础上,该文首次提出"教师技术应用能动性"概念,指出教师在信息时代应积极利用新技术... 能动性(Agency)作为促进教师专业发展的内在变量,近年来受到教师教育领域的高度关注。信息时代,技术是教师发挥能动性的一种主要工具。在此基础上,该文首次提出"教师技术应用能动性"概念,指出教师在信息时代应积极利用新技术促进其TPACK知识的提升,以完成他们在学校教育教学中的时代角色转变。该文在我国浙江、上海、河南、江苏四省选择了六所高级中学中的327名在职教师为样本,通过结构化问卷调查教师的技术应用能动性、TPACK知识及其在学校中的角色发展情况。结果表明:(1)高中教师技术应用能动性能显著预测高中教师TPACK知识;(2)教师技术应用能动性可通过教学任务管理,间接影响到高中教师TPACK知识;(3)教师的自我情绪管理可促进教师的教学任务管理,从而促进TPACK知识的提升等。研究建议:技术应用能动性是高中教师TPACK知识提升的内在动力来源,学校可以通过以下措施来促进其提升,从而促进教师TPACK知识的提升:(1)实施合理的教师管理制度,激发教师内在潜力;(2)增进学校内部社会交互,加强学校组织文化建设;(3)提升教师角色认同与反思,增强教师价值感。 展开更多
关键词 TPACK 技术应用能动性 高中教师 教师专业发展
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美国先进技术计划(ATP)的设计理念和运行机制创新 被引量:2
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作者 李建军 《自然辩证法通讯》 CSSCI 北大核心 2007年第6期60-65,共6页
美国先进技术计划的提出和成功实施涉及到一系列的理念和机制创新,具体包括政府应该集中资助那些开发具有前竞争力的、能动性技术的企业和从事技术转移和扩散的"滚动者"等理念创新,以及通过风险分担和产权激励强化企业主导地... 美国先进技术计划的提出和成功实施涉及到一系列的理念和机制创新,具体包括政府应该集中资助那些开发具有前竞争力的、能动性技术的企业和从事技术转移和扩散的"滚动者"等理念创新,以及通过风险分担和产权激励强化企业主导地位,建立多层面的产学研伙伴关系以扩大技术转移和扩散效应等机制创新。这些理念和机制创新对我国在建设创新型国家的过程中明确政府角色、确立项目重点、开发民间资源和选择政策工具等都具有相当重要的启示和借鉴。 展开更多
关键词 先进技术计划 能动性技术 伙伴关系 技术扩散
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信息化学习的发展:技术与行为的互动 被引量:3
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作者 唐鸣 《电化教育研究》 CSSCI 北大核心 2015年第8期11-17,共7页
目前,对于信息化学习所进行的研究,常常被预设在非正式学习的情景之内而展开。因此,基于既有学习形式的定义,信息化学习的定位及其与既有学习形式之间的关系也便具有了研究的意义。本文以技术和行为的互动作为研究的新视角,对互动的内... 目前,对于信息化学习所进行的研究,常常被预设在非正式学习的情景之内而展开。因此,基于既有学习形式的定义,信息化学习的定位及其与既有学习形式之间的关系也便具有了研究的意义。本文以技术和行为的互动作为研究的新视角,对互动的内涵、现象和结果进行了较为深入的探讨,并针对学习行为自由化、组织形态多元化的趋势,以社会发展规律作为背景进行了更深层次的解读。 展开更多
关键词 学习形态 正式学习 技术能动性 学习行为
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数字化教育技术的能动性、价值治理及教育性物化 被引量:12
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作者 金生鈜 《教育研究》 CSSCI 北大核心 2023年第11期14-28,共15页
数字化教育技术物具有实施教育行动、表现教育力量、施加教育影响、实现教育目标的意向性与能动性。只有植入教育价值,对其进行价值治理,数字化教育技术才能实现教育意义,其意向性与能动性才具有教育性与伦理性,才能成为复合教育者,才... 数字化教育技术物具有实施教育行动、表现教育力量、施加教育影响、实现教育目标的意向性与能动性。只有植入教育价值,对其进行价值治理,数字化教育技术才能实现教育意义,其意向性与能动性才具有教育性与伦理性,才能成为复合教育者,才能成为教育行动者集体的构成要素。价值治理是对数字化教育技术进行可持续的价值重建,把教育价值、价值学习方式植入技术,使技术蕴含教育意义、实现教育价值、发挥教育性力量。数字化教育技术的价值治理是教育数字化赋能教育变革的根本前提。教育性物化是对数字化教育技术进行价值治理的根本方式。教育性物化实现数字化教育技术的价值建构、意义归属与功能增殖的统一,是教育数字化不可或缺的组成部分。教育性物化使数字化教育技术教育化、道德化、价值化。教育意义物化、教育伦理物化、教育审美物化、教育目标物化是数字化教育技术价值治理的建设性路径。 展开更多
关键词 数字化教育技术 教育技术哲学 技术能动性 教育性物化 价值治理
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Predicting Resting-state Functional Connectivity With Efficient Structural Connectivity 被引量:1
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作者 Xue Chen Yanjiang Wang 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2018年第6期1079-1088,共10页
The complex relationship between structural connectivity(SC) and functional connectivity(FC) of human brain networks is still a critical problem in neuroscience. In order to investigate the role of SC in shaping resti... The complex relationship between structural connectivity(SC) and functional connectivity(FC) of human brain networks is still a critical problem in neuroscience. In order to investigate the role of SC in shaping resting-state FC, numerous models have been proposed. Here, we use a simple dynamic model based on the susceptible-infected-susceptible(SIS) model along the shortest paths to predict FC from SC. Unlike the previous dynamic model based on SIS theory, we focus on the shortest paths as the principal routes to transmit signals rather than the empirical structural brain network. We first simplify the structurally connected network into an efficient propagation network according to the shortest paths and then combine SIS infection theory with the efficient network to simulate the dynamic process of human brain activity. Finally, we perform an extensive comparison study between the dynamic models embedded in the efficient network, the dynamic model embedded in the structurally connected network and dynamic mean field(DMF) model predicting FC from SC. Extensive experiments on two different resolution datasets indicate that i) the dynamic model simulated on the shortest paths can predict FC among both structurally connected and unconnected node pairs; ii) though there are fewer links in the efficient propagation network, the predictive power of FC derived from the efficient propagation network is better than the dynamic model simulated on a structural brain network; iii) in comparison with the DMF model,the dynamic model embedded in the shortest paths is found to perform better to predict FC. 展开更多
关键词 Brain connectivity structure-function relationship susceptible-infected-susceptible (SIS)model the shortest paths
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Assessing performance of collision mitigation brake system in Chinese traffic environment 被引量:5
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作者 ZHAO Zhi-guo ZHENG Xun-jia +2 位作者 WANG Jian-qiang XU Qing KODAKA Kenji 《Journal of Central South University》 SCIE EI CAS CSCD 2019年第10期2854-2869,共16页
Advanced driver-assistance systems such as Honda’s collision mitigation brake system(CMBS)can help achieve traffic safety.In this paper,the naturalistic driving study and a series of simulations are combined to bette... Advanced driver-assistance systems such as Honda’s collision mitigation brake system(CMBS)can help achieve traffic safety.In this paper,the naturalistic driving study and a series of simulations are combined to better evaluate the performance of the CMBS in the Chinese traffic environment.First,because safety-critical situations can be diverse especially in the Chinese environment,the Chinese traffic-accident characteristics are analyzed according to accident statistics over the past 17 years.Next,10 Chinese traffic-accident scenarios accounting for more than 80%of traffic accidents are selected.For each typical scenario,353 representative cases are collected from the traffic-management department of Beijing.These real-world accident cases are then reconstructed by the traffic-accident-reconstruction software PC-Crash on the basis of accident-scene diagrams.This study also proposes a systematic analytical process for estimating the effectiveness of the technology using the co-simulation platform of PC-Crash and rateEFFECT,in which 176 simulations are analyzed in detail to assess the accident-avoidance performance of the CMBS.The overall collision-avoidance effectiveness reaches 82.4%,showing that the proposed approach is efficient for avoiding collisions,thereby enhancing traffic safety and improving traffic management. 展开更多
关键词 active-safety technology effectiveness assessment accident reconstruction autonomous emergency braking PC-CRASH
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Parameter optimization model in electrical discharge machining process 被引量:5
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作者 Qing GAO Qin-he ZHANG +1 位作者 Shu-peng SU Jian-hua ZHANG 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2008年第1期104-108,共5页
Electrical discharge machining (EDM) process, at present is still an experience process, wherein selected parameters are often far from the optimum, and at the same time selecting optimization parameters is costly and... Electrical discharge machining (EDM) process, at present is still an experience process, wherein selected parameters are often far from the optimum, and at the same time selecting optimization parameters is costly and time consuming. In this paper, artificial neural network (ANN) and genetic algorithm (GA) are used together to establish the parameter optimization model. An ANN model which adapts Levenberg-Marquardt algorithm has been set up to represent the relationship between material removal rate (MRR) and input parameters, and GA is used to optimize parameters, so that optimization results are obtained. The model is shown to be effective, and MRR is improved using optimized machining parameters. 展开更多
关键词 Electrical discharge machining (EDM) Genetic algorithm (GA) Artificial neural network (ANN) Levenberg- Marquardt algorithm
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Research on new type of fast-opening mechanism in steam turbine regulating system and optimization of operation tactic 被引量:2
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作者 Xiao-xiao LI Xuan-yin WANG Fu-shang LI 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2008年第5期633-639,共7页
With the analysis on regulating system in 200 MW steam turbine, the necessity of appending the fast-opening function to the original system is set forth and a new type of fast-opening mechanism is devised. The mathema... With the analysis on regulating system in 200 MW steam turbine, the necessity of appending the fast-opening function to the original system is set forth and a new type of fast-opening mechanism is devised. The mathematical model of system is built up. With the use of AMESIM software, the displacement curve of the piston, the force curve of the cartridge valve spool, the pressure curve and the flux curve in the regulation process are obtained based on simulation. The performances of three fast-opening systems composed of cartridge valves with different diameters are compared. Based on the analysis on factors that affect the execution time of fast-opening, the dead zone of the fast-opening system is put forward. To overcome the defect, dif- ferent operation modes are adopted for different zones. The result shows that with the increase of the valve diameter, the regulating time in the dead zone significantly exceeds the fast-opening time in the whole journey. Accordingly, the optimization operation tactic in the dead zone and the qualification conditions are brought forward. The fast-opening system composed of 32 mm cartridge valves is taken as an example with use of the tactic. The simulation result shows that the maximum regulating time is shortened by 509 ms. 展开更多
关键词 Steam turbine Fast-opening Regulating system AMESIM
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Effect of scratch on corrosion resistance of calcium phosphate conversion coated AZ80 magnesium alloy 被引量:5
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作者 Xue-jiao JIA Jiang-feng SONG +4 位作者 Xiao-rong QU Fu-yong CAO Bin JIANG Andrej ATRENS Fu-sheng PAN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2022年第1期147-161,共15页
In order to analyze the effect of scratch on the corrosion behaviour of a calcium phosphate conversion coating(CPCC)on AZ80,the electrochemical testing,scanning vibrating electrode technique(SVET),immersion test and h... In order to analyze the effect of scratch on the corrosion behaviour of a calcium phosphate conversion coating(CPCC)on AZ80,the electrochemical testing,scanning vibrating electrode technique(SVET),immersion test and hydrogen evolution experiment were performed to study the corrosion resistance of AZ80,AZ80 with CPCC and coated AZ80 with scratch.The results show that the coating improves the corrosion resistance of the AZ80 from a current density of(85±4)to(4±1)μA/cm^(2).When the coating was damaged,its protection on substrate would be reduced.The scratch with a length of around 12 mm on the coating reduced the corrosion resistance to a current density of(39±1)μA/cm^(2).In addition,the corrosion occurred initially in the scratch area and the corrosion site first occurred at the junction of the scratch and the coating.Besides,the micro corrosion mechanism of the specimen containing scratch was clarified. 展开更多
关键词 magnesium alloy AZ80 alloy SCRATCH conversion coating corrosion resistance scanning vibrating electrode technique(SVET)
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A new channel allocation scheme and performance optimizing for mobile multimedia wireless networks 被引量:1
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作者 赵方明 蒋铃鸽 马明达 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2008年第4期470-474,共5页
A multimedia channel allocation scheme is proposed and studied in terms of the connection-level QoS.A new traffic model based on multidimensional Markov chain is developed considering the traffic characteristic of two... A multimedia channel allocation scheme is proposed and studied in terms of the connection-level QoS.A new traffic model based on multidimensional Markov chain is developed considering the traffic characteristic of two special periods of time.And the pre-emptive priority strategies are used to classify real-time services and non-real-time services.Real-time service is given higher priority for its allowance to pre-empt channels used by non-real-time service.Considering the mobility of persons in a day,which affects the mobile user's density,the simulation was conducted involving the two pre-emptive priority strategies.The result of some comparisons shows the feasibility of the proposed scheme. 展开更多
关键词 HANDOFF channel allocation pre-emptive priority blocking probability
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A spatially triggered dissipative resource distribution policy for SMT processors 被引量:1
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作者 Hong-zhou CHEN Xue-zeng PAN +2 位作者 Ling-di PING Kui-jun LU Xiao-ping CHEN 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2008年第8期1070-1082,共13页
Programs take on changing behavior at nmtime in a simultaneous multithreading (SMT) environment. How reasonably common resources are distributed among the threads significantly determines the throughput and fairness... Programs take on changing behavior at nmtime in a simultaneous multithreading (SMT) environment. How reasonably common resources are distributed among the threads significantly determines the throughput and fairness performance in SMT processors. Existing resource distribution methods either mainly rely on the front-end fetch policy, or make distribution decisions according to the limited information from the pipeline. It is difficult for them to efficiently catch the various resource requirements of the threads. This work presents a spatially triggered dissipative resource distribution (SDRD) policy for SMT processors, its two parts, the self-organization mechanism that is driven by the real-time instructions per cycle (IPC) performance and the introduction of chaos that tries to control the diversity Of trial resource distributions, work together to supply sustaining resource distribution optimization for changing program behavior. Simulation results show that SDRD with fine-grained diversity controlling is more effective than that with a coarse-grained one. And SDRD benefits much from its two well-coordinated parts, providing potential fairness gains as well as good throughput gains. Meanings and settings of important SDRD parameters are also discussed. 展开更多
关键词 Simultaneous multithreading (SMT) Resource distribution Dynamic optimization Dissipative structures
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Numerical simulation of the anti-shock performance of a gear case 被引量:1
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作者 姚熊亮 周其新 +1 位作者 张阿漫 冯麟涵 《Journal of Marine Science and Application》 2008年第1期33-39,共7页
Both sea battles and testing of ship in underwater explosions reveal unacceptably poor anti-shock performance of important shipboard equipment. Anti-shock performance of shipboard equipment is a significant factor det... Both sea battles and testing of ship in underwater explosions reveal unacceptably poor anti-shock performance of important shipboard equipment. Anti-shock performance of shipboard equipment is a significant factor determining fighting strength and survivability. The anti-shock performance of a shipboard gear case based on BV043/85 was investigated using numerical simulation. A geometric model of the gear case was built using MDT software and meshed in HyperMesh software, and then the finite element model of the gear case was formed. Using ABAQUS software, the anti-shock performance of the gear case was simulated. First, shock response of typical regions of gear case was determined. Next, some generalizations were made about the anti-shock performance of the gear case by analyzing the Mises stress of typical regions varied with shock inputs. Third, weak regions were determined from simulation results. The threshold values of shock resistance of the gear case at different impulse widths were obtained through interpolating the numerical simulation results selected from the most dangerous spot. This research provides a basis for further optimization of the design of gear cases. 展开更多
关键词 shipboard equipment gear case ANTI-SHOCK numerical simulation
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Dynamic characteristics of a working platform supported by an AMG
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作者 张钢 《High Technology Letters》 EI CAS 2008年第2期193-198,共6页
A coupled electromechanical dynamic model for a working platform supported by an active magneticguide(AMG)is set up according to the special stiffness and damping theory of maglev system and theunique vibration of the... A coupled electromechanical dynamic model for a working platform supported by an active magneticguide(AMG)is set up according to the special stiffness and damping theory of maglev system and theunique vibration of the working platform for a machine tool.The dynamic characteristics of a workingplatform supported by an AMG are studied using different groups of control parameters.Results show thatthe dynamic characteristics of the platform system,such as critical vibration frequency,vibration modeand so on,can be improved by adjusting the control parameters.This research offers theoretical supportfor ultra-high-speed and ultra-precise machine working platform designs,including the structure of plat-forms,the design of electromagnets,and the establishment of the control parameters. 展开更多
关键词 working platform active magnetic guide (AMG) dynamic characteristics maglev system
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Real-Time Arm Animation with Natural Collision Avoidance
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作者 倪慧 孙济洲 刘艳 《Transactions of Tianjin University》 EI CAS 2007年第5期365-369,共5页
A novel approach to realistic collision-free animation of the upper limb was proposed.According to the obstacle-avoidance strategy of human hand,the movement trajectory was computed by manipulability model and minimum... A novel approach to realistic collision-free animation of the upper limb was proposed.According to the obstacle-avoidance strategy of human hand,the movement trajectory was computed by manipulability model and minimum-jerk based interpolation.In each key frame,an improved in~verse kinematics method was adopted to obtain a believable posture of the upper limb.By comparing with the real movement data obtained from the motion capture device,the resultant animation was testified to be natural.This method can be performed in interactive time,and therefore is applicable in animation edit and control of virtual humans. 展开更多
关键词 ANIMATION collision avoidance manipulability model INTERPOLATION
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Grid tie inverter energy stabilizing in smart distribution grid with energy storage 被引量:1
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作者 孙秋野 李大双 +1 位作者 褚恩辉 张艺缤 《Journal of Central South University》 SCIE EI CAS 2014年第6期2298-2305,共8页
With the growing deployment of smart distribution grid,it has become urgent to investigate the smart distribution grid behavior during transient faults and improve the system stability.The feasibility of segmenting la... With the growing deployment of smart distribution grid,it has become urgent to investigate the smart distribution grid behavior during transient faults and improve the system stability.The feasibility of segmenting large power grids and multiple smart distribution grids interconnections using energy storage technology for improving the system dynamic stability was studied.The segmentation validity of the large power grids and smart distribution grid inverter output interconnections power system using energy storage technology was proved in terms of theoretical analysis.Then,the influences of the energy storage device location and capacity on the proposed method were discussed in detail.The conclusion is obtained that the ESD optimal locations are allocated at the tie line terminal buses in the interconnected grid,respectively.The effectiveness of the proposed method was verified by simulations in an actual power system. 展开更多
关键词 smart distribution grid grid tie inverter energy stabilizing SEGMENTATION energy storage technology system interconnection
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Influence of sway motion on passive anti-rolling tank
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作者 SUN Wei LIANG Li-hua ZHANG Hong 《Journal of Marine Science and Application》 2006年第1期17-22,共6页
The passive anti-rolling tank is one of important ship stabilizers widely used today. But at present, research of the tank is most aimed at its rolling movement. In this paper, the influence of sway motion on the pass... The passive anti-rolling tank is one of important ship stabilizers widely used today. But at present, research of the tank is most aimed at its rolling movement. In this paper, the influence of sway motion on the passive anti-rolling tank is considered, the mathematical model of "ship-passive antl-rolling tank" system coupled with sway motion is developed basing on the U-shaped passive anti-rolling tank theory. Both simulation results and experimental data indicate that it is necessary to consider the influence of sway motion on the anti-rolling tank, which is more agreeable to the actual circumstance. 展开更多
关键词 SHIP ROLLING passive anti-rolling tank sway motion
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Application of the fault diagnosis strategy based on hierarchical information fusion in motors fault diagnosis
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作者 XIA Li FEI Qi 《Journal of Marine Science and Application》 2006年第1期62-68,共7页
This paper has analyzed merits and demerits of both neural network technique and of the information fusion methods based on the D-S (dempster-shafer evidence) Theory as well as their complementarity, proposed the hier... This paper has analyzed merits and demerits of both neural network technique and of the information fusion methods based on the D-S (dempster-shafer evidence) Theory as well as their complementarity, proposed the hierarchical information fusion fault diagnosis strategy by combining the neural network technique and the fused decision diagnosis based on D-S Theory, and established a corresponding functional model. Thus, we can not only solve a series of problems caused by rapid growth in size and complexity of neural network structure with diagnosis parameters increasing, but also can provide effective method for basic probability assignment in D-S Theory. The application of the strategy to diagnosing faults of motor bearings has proved that this method is of fairly high accuracy and reliability in fault diagnosis. 展开更多
关键词 neural network information fusion dempster-shafer evidence theory fault diagnosis MOTOR
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A hybrid model of a subminiature helicopter in horizontal turn
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作者 陈丽 Gong Zhenbang Liu Liang 《High Technology Letters》 EI CAS 2007年第2期113-118,共6页
A hybrid model of a subminiature helicopter in horizontal turn is presented. This model is based on a mechanism model and its compensated neural network (NN). First, the nonlinear dynamics of a sub-miniature helicop... A hybrid model of a subminiature helicopter in horizontal turn is presented. This model is based on a mechanism model and its compensated neural network (NN). First, the nonlinear dynamics of a sub-miniature helicopter is established. Through the linearization of the nonlinear dynamics on a trim point, the linear time-invariant mechanism model in horizontal turn is obtained. Then a diagonal recursive neural network is used to compensate the model error between the mechanism model and the nonlinear model, thus the hybrid model of a subminiature helicopter in horizontal turn is achieved. Simulation results show that the hybrid model has higher accuracy than the mechanism model and the obtained compensated-NN has good generalization capability. 展开更多
关键词 subminiature helicopter horizontal turn mechanism model compensated neural net-work hybrid model
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Numerical simulation on influence of jet angle on jet's characteristics in flowing ambient fluid
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作者 周丰 孙昭晨 梁书秀 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2008年第4期528-534,共7页
Based on the stress-algebraic model, the turbulent buoyant jet with variable density was studied by the relation between density and concentration. A simple expression for buoyancy coefficient was proposed. The govern... Based on the stress-algebraic model, the turbulent buoyant jet with variable density was studied by the relation between density and concentration. A simple expression for buoyancy coefficient was proposed. The governing equations of turbulent buoyant jet with variable density were closed by introducing the expression of β and the relation between density and concentration. Numerical results for the jet axis with density difference agree well with experimental ones. By finite volume method, the 2 - D vertical jet's flow field with different jet angles was studied. The analysis of the relation among the vortex center, the position of separation point and jet angles shows that the circumfluenee field is the largest when the jet angle is 90°. The area turbulent kinetic energy ka is proposed and the relationship between mixing intensity and jet angles is analyzed based on it. Results show that the jet angle of is the optimum condition for jet water mixing with environment water;and the reduced rate of difference between the centerline density of jet and the density of ambient water is the largest at the jet angle of 90°. 展开更多
关键词 jet angle stress-algebraic model with variable density vortex center point separation point areaturbulent kinetic energy
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Modeling Topology and Nonlinear Dynamical Behavior of the Weighted Scale-Free Networks
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作者 YANG Qiu-Ying ZHANG Gui-Qing ZHANG Ying-Yue CHEN Tian-Lun 《Communications in Theoretical Physics》 SCIE CAS CSCD 2008年第7期120-124,共5页
An improved weighted scale-free network, which has two evolution mechanisms: topological growth and strength dynamics, has been introduced. The topology structure of the model will be explored in details in this work... An improved weighted scale-free network, which has two evolution mechanisms: topological growth and strength dynamics, has been introduced. The topology structure of the model will be explored in details in this work. The evolution driven mechanism of Olami-Feder Christensen (OFC) model is added to our model to study the self-organlzed criticality and the dynamical behavior. We also.consider attack mechanism and the study of the model with attack is also investigated in this paper. We tlnd there are differences between the model with attack and without attack. 展开更多
关键词 weighted scale-free network ATTACK self-organized criticality
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