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基于析取模型的技能约简与推测关系的研究 被引量:2
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作者 周银凤 韩光明 《闽南师范大学学报(自然科学版)》 2020年第3期1-7,共7页
技能是解决问题所需的方法.在析取模型下,技能映射可诱导出知识空间.然而,并不是所有技能都是同等重要的.技能存在冗余现象.针对上述问题,本文对技能约简与推测关系进行研究.首先通过定义技能集的约简,探讨技能的特征.其次讨论推测关系... 技能是解决问题所需的方法.在析取模型下,技能映射可诱导出知识空间.然而,并不是所有技能都是同等重要的.技能存在冗余现象.针对上述问题,本文对技能约简与推测关系进行研究.首先通过定义技能集的约简,探讨技能的特征.其次讨论推测关系与基和原子以及技能约简子集之间的联系. 展开更多
关键词 知识空间 析取模型 技能约简 推测关系
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基于优化模型的萃取精馏过程设计方法 被引量:1
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作者 田琨 张翔 张磊 《高校化学工程学报》 EI CAS CSCD 北大核心 2021年第3期542-551,共10页
针对萃取精馏过程设计自由度多且过程复杂的问题,提出系统性的萃取精馏过程经济性优化设计方法。该方法通过文献及数据库检索列举出多种备选萃取剂并基于分离工程的理论知识进行筛选,选择合适的热力学模型与实验数据回归模型参数以表征... 针对萃取精馏过程设计自由度多且过程复杂的问题,提出系统性的萃取精馏过程经济性优化设计方法。该方法通过文献及数据库检索列举出多种备选萃取剂并基于分离工程的理论知识进行筛选,选择合适的热力学模型与实验数据回归模型参数以表征体系相平衡。全流程的优化通过在通用代数建模系统(GAMS)中建立严格的广义析取规划模型(GDP)来实现,并用精馏塔的经济模型计算设备及操作费用,以年均费用最低为目标函数,对塔的设计变量和操作参数同时进行数值优化。以醋酸-水的萃取精馏分离为例,结果表明该方法可明显降低醋酸生产能耗和生产费用,较传统的单一变量灵敏度分析法有明显优势。 展开更多
关键词 萃取精馏 严格过程优化 通用代数建模系统(GAMS) 广义析取规划模型 醋酸-水
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作业车间调度问题综述 被引量:12
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作者 赵诗奎 王林瑞 石飞 《济南大学学报(自然科学版)》 CAS 北大核心 2016年第1期74-80,共7页
综述作业车间调度问题(job shop scheduling problem,JSP)基于精确方法和近似方法的研究体系,重点总结近似方法中基于智能算法的求解方法,归纳智能算法求解JSP问题的技术框架。基于对技术框架的分析,指出JSP问题在扩展问题模型、智能算... 综述作业车间调度问题(job shop scheduling problem,JSP)基于精确方法和近似方法的研究体系,重点总结近似方法中基于智能算法的求解方法,归纳智能算法求解JSP问题的技术框架。基于对技术框架的分析,指出JSP问题在扩展问题模型、智能算法通用知识以及与问题特征相结合领域知识方面都有待深入研究。 展开更多
关键词 作业车间调度问题 析取模型 智能算法 遗传算法 禁忌搜索算法
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技能映射下学习空间判别定理 被引量:1
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作者 赵青 韩光明 梁娟 《闽南师范大学学报(自然科学版)》 2021年第1期20-25,共6页
在知识空间理论中,个体的知识状态不仅可以由个体能解决的问题确定,还可以由其掌握的技能确定.技能映射反映了问题和技能间的联系,但是技能映射下导出的知识结构一般都不是学习空间.由于无论是由技能映射导出知识结构的过程,还是判定知... 在知识空间理论中,个体的知识状态不仅可以由个体能解决的问题确定,还可以由其掌握的技能确定.技能映射反映了问题和技能间的联系,但是技能映射下导出的知识结构一般都不是学习空间.由于无论是由技能映射导出知识结构的过程,还是判定知识结构是否是学习空间的过程都比较复杂,因此有必要直接在技能映射下研究导出学习空间的条件.本文首先给出了基于原子的学习空间判别定理.在此基础上,根据每项技能确定的知识状态与原子间的关系,提出了析取模型下学习空间判别定理.进一步地,利用合取模型和析取模型下导出的知识结构的对偶性,提出了合取模型下学习空间判别定理. 展开更多
关键词 学习空间 原子 技能映射 析取模型 合取模型
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A Novel Interconnect Crosstalk Parallel RLC Analyzable Model Based on the 65nm CMOS Process
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作者 朱樟明 钱利波 杨银堂 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2008年第3期423-427,共5页
Based on the 65nm CMOS process,a novel parallel RLC coupling interconnect analytical model is presented synthetically considering parasitical capacitive and parasitical inductive effects. Applying function approximati... Based on the 65nm CMOS process,a novel parallel RLC coupling interconnect analytical model is presented synthetically considering parasitical capacitive and parasitical inductive effects. Applying function approximation and model order-reduction to the model, we derive a closed-form and time-domain waveform for the far-end crosstalk of a victim line under ramp input transition. For various interconnect coupling sizes, the proposed RLC coupling analytical model enables the estimation of the crosstalk voltage within 2.50% error compared with Hspice simulation in a 65nm CMOS process. This model can be used in computer-aided-design of nanometer SOCs. 展开更多
关键词 nanometer CMOS interconnect coupling crosstalk parallel RLC analytical model parameter extraction function approximation
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析取稳定模型和大胆辩论推理
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作者 王克文 陈火旺 +1 位作者 吴泉源 肖侬 《中国科学(E辑)》 CSCD 1998年第3期268-273,共6页
将任意析取逻辑程序自然转化为一个辩论推理框架 ,大胆辩论推理的实现则由所有极大可接受假说刻画 ,从而提出了一种实现大胆辩论推理的析取逻辑程序系统 ,并得到了一些有意思的结果 ,特别是证明了大胆辩论推理可由析取稳定语义实现 .
关键词 辩论推理 析取稳定模型 人工智能 大胆辩论推理
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Analysis of characteristic functions for equivalent circuit model in monolithic transformer 被引量:1
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作者 吴忠洁 Lu Jingxue +1 位作者 Huang Fengyi Jiang Nan 《High Technology Letters》 EI CAS 2012年第2期124-127,共4页
A model of monolithic transformers is presented, which is analyzed with characteristic functions. A closed- form analytical approach to extract all the model parameters for the equivalent circuit of Si-based on-chip t... A model of monolithic transformers is presented, which is analyzed with characteristic functions. A closed- form analytical approach to extract all the model parameters for the equivalent circuit of Si-based on-chip transformers is proposed. A novel de-coupling technique is first developed to reduce the complexity in the Y parameters for the transformer, and the model parameters can then be extracted analytically by a set of characteristic functions. Simulation based on the extracted parameters has been carried out for transformers with different structures, and good accuracy is obtained compared to a 3-demensional full-wave numerical electro- magnetic field solver. The presented approach will be very useful to provide a scalable and wide-band compact circuit model for Si-based RF transformers. 展开更多
关键词 TRANSFORMER parameter extraction compact model radio frequency integrate circuit((RFIC)
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Traffic analysis on carrier accessing for WLAN indoor positioning system
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作者 马琳 秦丹阳 徐玉滨 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2012年第2期113-118,共6页
Currently,the WLAN indoor positioning system attracts a lot of interests,not only because of the cheap implementation but also because of the high positioning accuracy comparing with other indoor positioning systems.T... Currently,the WLAN indoor positioning system attracts a lot of interests,not only because of the cheap implementation but also because of the high positioning accuracy comparing with other indoor positioning systems.The WLAN indoor positioning system contains two phases,which are offline phase and online phase.In the online phase,the WLAN equipment user(UE) has to access to the WLAN for the latest radio map and positioning software.Due to during the network allocation vector(NAV) duration,the WLAN channel is only reserved for one WLAN UE,others UEs' carrier accessing will be blocked.In addition,the blocked UE will make a retrial accessing,which will definitely introduce more traffic blocking to the WLAN.So In this paper,based on the analysis of the WLAN indoor positioning system architecture,a proper queuing model by using of the Extended Erlang B formula is proposed,which takes the retrial calling percentage into consideration in the proposed model.The simulation results show that the proposed method is more accurate and performs well to predict the blocking probability. 展开更多
关键词 WLAN i extended Erlang B blocking probability Queue theory recalling factor
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Analyzing Heat Extraction and Sustainability of EGS with a Novel Model
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作者 Jiliang Chen Liang Luo Fangming Jiang 《Journal of Earth Science and Engineering》 2013年第10期690-700,共11页
We investigate the subsurface heat exchange process in EGS (enhanced geothermal systems) with a previously developed novel model. This model treats the porous heat reservoir as an equivalent porous medium of a singl... We investigate the subsurface heat exchange process in EGS (enhanced geothermal systems) with a previously developed novel model. This model treats the porous heat reservoir as an equivalent porous medium of a single porosity. However, it considers local thermal non-equilibrium between solid rock matrix and fluid flowing in the factures and employs two energy conservation equations to describe heat transfer in the rock matrix and in the fractures, respectively, enabling the modeling and analyses of convective heat exchange in the heat reservoir. Another salient feature of this model is its capability of simulating the complete subsurface heat exchange process in EGS. The EGS subsurface geometry of interest physically consists of multiple domains: open channels for injection and production wells, the artificial heat reservoir, and the rocks enclosing the heat reservoir, while computationally we treat it as a single-domain of multiple sub-regions associated with different sets of characteristic properties (porosity and permeability, etc.). This circumvents typical difficulties about matching boundary conditions between sub-domains in traditional multi-domain approaches and facilitates numerical implementation and simulation of the complete subsurface heat exchange process. This model is used to perform a comprehensive parametric study with respect to an imaginary doublet EGS. Effects of several parameters, including the permeability of heat reservoir, heat exchange coefficient in the heat reservoir, the specific area of fractures in the heat reservoir, and thermal compensation from surrounding rocks, on the heat extraction efficiency and EGS lifetime are analyzed. 展开更多
关键词 Hot dry rock technology enhanced or engineered geothermal system local thermal non-equilibrium numerical model porous heat reservoir.
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THE APPLICATION OF THE COMPUTER AIDED ANALYSIS IN THE DESIGN OF COALMINE MACHINERY LINKAGES
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作者 寇子明 许步勤 沈现军 《Journal of Coal Science & Engineering(China)》 1996年第1期98-104,共7页
This paper gives and verifies a mathematical model with only one argument which determines the movement parameters of any point in a plane four-bar linkage on the basis of the analysis of mining machinery linkages. C ... This paper gives and verifies a mathematical model with only one argument which determines the movement parameters of any point in a plane four-bar linkage on the basis of the analysis of mining machinery linkages. C A A (computer aided analysis) based on the mathemetical model can be used to make not only the quick and accurate analysis and design of mining machinery linkages but also the movement analysis and optimization design of any other plane four-bar linkage. 展开更多
关键词 linkage mechanism mathematical model computer aided design mining machinery
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Performance Behaviour Analysis of the Present 3-Level Cache System for Multi-Core Processors
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作者 Muhammad Ali Ismail 《Computer Technology and Application》 2012年第11期729-733,共5页
In this paper, a study related to the expected performance behaviour of present 3-level cache system for multi-core systems is presented. For this a queuing model for present 3-level cache system for multi-core proces... In this paper, a study related to the expected performance behaviour of present 3-level cache system for multi-core systems is presented. For this a queuing model for present 3-level cache system for multi-core processors is developed and its possible performance has been analyzed with the increase in number of cores. Various important performance parameters like access time and utilization of individual cache at different level and overall average access time of the cache system is determined. Results for up to 1024 cores have been reported in this paper. 展开更多
关键词 MULTI-CORE memory hierarchy cache access time queuing analysis.
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Simulation Analysis of Macroeconomic Policy Orientations' Effects on the Industrial Economy——Based on Dynamic CGE Model
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作者 原磊 王秀丽 《China Economist》 2014年第2期100-112,共13页
There are three different orientations of the macroeconomic policies,namely,factor-expansion,prudent-continuation and structural-adjustment.The paper uses the dynamic CGE model to simulate the effects of the three dif... There are three different orientations of the macroeconomic policies,namely,factor-expansion,prudent-continuation and structural-adjustment.The paper uses the dynamic CGE model to simulate the effects of the three different orientations on the economy,and arrives at the following conclusions:while the factor-expansion policies can lead to growth of economic output,they also result in the further imbalance in the industrial structure and the "crowding-out effect" on the private investment.In addition,such growth is unsustainable in the long run;the growth of the industrial economy will decline rapidly to a lower level after reaching a certain high level.The prudent-continuation policies refer to the continuation of the current policies that sustain the current trends of the industrial economy,and such policies reduce the growth of the industrial economy to a lower level in the long run.The structural-adjustment policies reduce the economic output at the current stage;however,it can bring a gradual improvement of industrial structure and a balance of the supply and demand.In the long run,the optimized structure will improve the total factor productivity(TFP) and the production-possibility frontier,and thereby realize a longterm steady and rapid growth of the industrial economy.Four policy recommendations are proposed based on the simulation of the models,including taking the structural adjustment as the fundamental orientation of macroeconomic policies,lowering the "floor level" of economic growth with macro regulation,giving play to the fundamental role of market mechanism in structural adjustment and increasing the role of TFP in the growth of the industrial economy. 展开更多
关键词 dynamic CGE model factor-expansion policies prudent-continuationpolicies structural-adjustment policies
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