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.

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.

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.

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.

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.

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.

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.

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.

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.