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模型概念
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  model concept
     Some problems of model concept,model structure and model management in NDSSG
     本文讨论了NDSSG的模型概念、模型构造以及模型管理中的一些问题,还就构模语言SML的设计进行了研讨,最后给出了一些评价。
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     Using 'soft' master model concept and EZMap model representation of surface, the integration of CAD/CAPP/CAM is easily realized in the ICAM architecture. By using the master model, the ICAM architecture supports concurrent engineering in die design and machining.
     该构架基于柔性主模型概念 ,采用EZMap曲面表达模型 ,便于实现模具CAD/CAPP/CAM的集成 ,同时支持模具设计和制造的并行工程。
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     Some problems of model concept, model structure and model management in DSSG of Decision Support System development tool are discussed . The concept of atomic model and composite model is introduced in order to use DSSG completely.
     讨论了决策支持系统开发工具DSSG的模型概念、模型构造以及模型库管理中的一些问题,引人原子模型和复合模型概念
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     The system has also introduced the model concept of knowledge,and established the knowledge base system based on knowledge model,and have spatial database,relation database and knowl- edge base become an organic whole,so GIS have been developed.
     系统还引入了知识模型概念,建立了以知识模型为特征的知识库系统,并将空间数据库、关系数据库和知识库构建成三库一体,从而拓展了GIS系统功能。
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     The model concept of the most compactly pile, closed to hydration degree, is brought forward first time.
     首次提出“与水化程度相适应的最紧密堆积”模型概念
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  “模型概念”译为未确定词的双语例句
     Case model has been established according to the design requirements and the features of products.
     基于所提出的实例模型概念,根据设计要求和产品的特征,建立产品的实例模型。
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     Master Model and its Application in The CAM
     主模型概念及其在数控加工中的应用
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     Concept of Spatial Database Model and Its Architecture Research
     空间数据库模型概念与结构研究
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     This paper discusses an approach based on such meta-model to extend UML activity diagram in order to integrate the activity and information to define workflow completely.
     论文基于此元模型概念扩展UML活动图,得到扩展的工作流过程图,按各模型间的关系把工作流的活动和活动执行所需要的信息合成一体,完整地定义工作流过程。
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     In order to improve efficiency of virtual product development and rein dynamic response peculiarity between the product defining data and environment defining data, the method of virtual product development based on the holographic product model is discussed after the concept of holographic product model is introduced.
     为了提高虚拟产品开发的效率,驾驭产品定义数据和环境定义数据相互作用的动态响应特性,本文在全息产品模型概念的基础上,提出了基于全息产品模型的虚拟产品开发的方法。
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  相似匹配句对
     the concept of formal logic concerns models;
     形式逻辑的概念关系模型;
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     Theories Review on Conceptual Combination
     概念组合的理论模型
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     S. models have been found.
     S.模型
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     This improved mixing dielectric model yields an excellent fit to measured data.
     模型
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  model concept
A model concept is based on the electrochemical processes proceeding at the metal/solution interface.
      
The results of calculations show that the proposed model concept is quite realistic.
      
We develop an analytical and quantitative theory of the tube model concept for entangled networks of semiflexible polymers.
      
The new model concept is described, and results from a 300-year control integration is evaluated against observational data.
      
Thus, by using the optimized statistical model concept, probabilistic models with desired features for various biological processes may be obtained in a simple and general manner.
      
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The fission prompt neutron spectrum,the average number of neutrons emittedper fission and the average energies of neutrons for neutron-induced fission of ura-nium and plutonium isotopes were calculated,using evaporation model with a univer-sal pre-scission neutron component of about 10% added empirically.General appro-ximation formulae for the average number of neutrons per fisson and the averageneutron energy were derived and Terrell's formula was rederived theoretically withoutadjustable constants.In the incident...

The fission prompt neutron spectrum,the average number of neutrons emittedper fission and the average energies of neutrons for neutron-induced fission of ura-nium and plutonium isotopes were calculated,using evaporation model with a univer-sal pre-scission neutron component of about 10% added empirically.General appro-ximation formulae for the average number of neutrons per fisson and the averageneutron energy were derived and Terrell's formula was rederived theoretically withoutadjustable constants.In the incident neutron energy range 0—18 MeV considered,the agreement between calculated and experimental results is satisfactory.NUCLEAR FISSION:U,Pu(n,f);energy range 0—18 MeV;fission prompt neutron spectrum,average number of emittedneutrons and neutron average energy calculated.

本文用蒸发模型计算了重核裂变碎片的瞬发中子能谱,发现在约化后基本上是普适谱.用算得的碎片蒸发中子谱计算了~(235,238)U、~(239,240)Pu 的裂变瞬发中子谱,平均中子数及中子平均能量,得出了计算平均中子数及中子平均能量的普遍近似公式。入射中子能量为0—18 MeV,计算结果一般在5%以内与实验符合.在较严格的蒸发模型计算的基础上重新推出了 Terrell 公式.本工作表明蒸发模型的概念运用于裂变瞬发中子的情形基本上是成功的,但需要引入约10%的断裂前中子。

When wall stresses of tall buildings are analyzed by using finite element method, finer meshes are required for considering the effect of openings on walls. Thus too many unknown quantities will be involved in computation and it is inadequate for computers with limited storage, especially when the whole structure is analyzed and considered as a spatial one.In this paper, the "equivalent membrane" model was used to analyze the opening effect of walls. The node displacements of the whole structure were obtained...

When wall stresses of tall buildings are analyzed by using finite element method, finer meshes are required for considering the effect of openings on walls. Thus too many unknown quantities will be involved in computation and it is inadequate for computers with limited storage, especially when the whole structure is analyzed and considered as a spatial one.In this paper, the "equivalent membrane" model was used to analyze the opening effect of walls. The node displacements of the whole structure were obtained at first and the internal forces were then solved byassigning these known displacementsThe approach of "equivalent membrane" model is discussed in the paper and numerical examples are given.

高层建筑的墙体应用有限元分析时,为了考虑孔洞削弱的影响,需要加密网格,这就会出现节点未知数太多,特别是按整体空间分析时,计算机资源远远不能满足要求。本文用“等价膜”模型来考虑孔洞削弱的影响,借此先求得整幢高层建筑有关各点位移,然后再利用指定位移的办法求出开孔墙的内力。文中主要讨论“等价膜”模型概念,并给出计算实例。

This paper puts forward a "current model" concept of maneuvering targets.It means that when a target is maneuvering with a certain acceleration at present,the region of acceleration which can be taken in the next instant is limited,and is always around "current" acceleration.Therefore,it is unnecessary to take all of the acceleration value of targets into account during the establishing of statistical model of maneuvering acceleration.In view of the fact that "current" acceleration is variable,a kind of sliding...

This paper puts forward a "current model" concept of maneuvering targets.It means that when a target is maneuvering with a certain acceleration at present,the region of acceleration which can be taken in the next instant is limited,and is always around "current" acceleration.Therefore,it is unnecessary to take all of the acceleration value of targets into account during the establishing of statistical model of maneuvering acceleration.In view of the fact that "current" acceleration is variable,a kind of sliding maneuvering acceleration probability density function-modified Rayleigh density function whose mean-value is the current acceleration of target is proposed in this paper.By the use of the relationship between mean-value and variance of Rayleigh distribution,an adaptive algorithm of state noise variance can be accomplished.It is pointed out in this paper that when Kalman filter is used to estimate states of targets,there exists physical link between the state variable(acceleration)and the state noise since the maneuvering acceleration of targets is usully taken as the output of a system driven by white noise.Furthermore,the estimate of state variable(acceleration)is just the mean-value of the state noise multiplied by a coefficient.Taking advantage of this important property,an acceleration mean-value adaptive algorithm may be realized in tracking the maneuvering target.Based on the two points mentioned above,an acceleration meanvalue and variance adaptive Kalman filtering algorithm is presented in this paper.By the use of this algorithm,the estimation of states and the calculation of Kalman gains which used to be computed separately are put in an unified closed loop.Some anal-yses and computer simulation results in one and three dimensional cases are given in this paper.The simulation results show that under the condition that only target position data are available,the model and adaptive algorithm proposed in this paper can estimate the position,velocity and acceleration of target well,no matter whether the targets are highly maneuvering or not.Generally speaking,the relative value of the mean errors are less than 0.5% for range,1% for velocity and 2% for acceleration and the relative root-mean-square errors are less than 0.5%,5% and 5% respectively.

本文提出机动目标“当前”统计模型的概念并建议用修正的瑞利-马尔科夫过程描述目标随机加速机动的统计特性。文中指出了在机动目标运动模型中状态(机动加速度)估值与状态噪声之间的内在联系。在此基础上提出了具有机动加速度均值及方差自适应的卡尔曼滤波算法。对一维和三维的情形进行了计算机模拟。计算结果表明,在仅对目标位置进行观测的情况下,这类自适应估值算法无论对高度机动或无机动的目标均可绘出较好的位置、速度及加速度估值。

 
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