1998 Vol. 23, No. 3
In this paper,chaology,fractal geometry and other related newly developed non-linear theories have been introduced into the study of traditional Chinese architectural and garden design,and "Feng- shui",the theoretical source of space analysis and design.We argue that traditional Chinese architectural space concept is a kind of chaological space concept,and its form generation mechanism is more related to fractal geometry,which pursues a non-linear order (involving both linear and non linear transformations).On this basis,we proposed a study on "chaotic/fractal architecture",a set of new theories and methods for architectural and urban space analysis and design.
Based on the principles of grey relative degree,fuzzy cluster analysis and multi-objective decision making technique,the paper presents a method of dynamic cluster analysis through time series data.Taking complicated urbanization process for an example,the method is applied with some significant results.It is proved that the method could be employed to model any complicated dynamic system with multi-factors.
This is one of results of 3-D reconstruction of urban buildings and visualization of city models. On the basis of common 2-D triangulated irregular network (TIN). This paper developed 2D-TIN under determined boundary condition, through respective generation of 2D-TIN of irregular roof and vertical wall concerning the terrain, composed 2-D TIN of building surface, realized 3-D visualization method of urban buildings concerning the terrain after expunction of common side under same plane condition, inborn data in DXF format can access directly AutoCAD、 3D Studio and OpenGL.
Aiming at the purpose of route survey and design, an efficient algorithm for TIN generation and updating is introduced in this paper.This algorithm is designed to usestrip distuibuted data for analogous delaunay triangles generation, and for local TIN updating.The results of a case study are also showed.
The vector-based method for generation of Voronoi diagram was analyzed at first. The drawbacks motived us to research the method which was suitable for GIS. In the paper, raster-based method for generation of Voronoi diagram was proposed at the first time. The key factor for it was distance transformation. Several methods using distance transformation were compared, the errors of which were also analyzed. At last the procedure for generation of objects's Voronoi diagram was introduced.
This paper presents a fully fuzzy strategy for image classification based on a neural network architecture, which promises to overcome some problems encounered in a conventional crisp even fuzzy classification process. The proposed method was successfully applied in a classification of a suburban land cover with resuls confirming the flexibility and practicality of this fully fuzzy approach.
According to the characteristic of SAR image noise, the popular filter methods, such as average filter,median filter, Delta filter, Lee adaptive filter and the modified K-value adaptive filter are analyzed. This paper proposes a new method to reduce the noise-based on average and media adaptive filter. Finally, the experiment results certify the advantages of the method.
Intrinsic geodetic boundary value problem (GBVP) is proposed and discussed in the paper. So it is possible to study the earth's intrinsic geometrical structure with the help of gravimetrical boundary measurements. Intrinsic GBVP is the intrinsic form of GBVP; its iterative approximative series is given and the integral solutions of the consulted BVP in the intrinsic coordinates are constructed.
In this paper, the spectral methods based on the input output system theory (IOST) were used to compute quantities related to the gravity field. These method are almost equivalent to least squares collocation (LSC) method in the accuracies of results, but they can use both isotropic and non-isotropic power spectral density functions (PSDs) easily. The recovery of the gravity field is made by combining salellite altimeter data and sea gravity data. The results show that higher prediction accuracies are always obtained when using non-isotropic information instead of the isotropic one.
Based on the analysis of the assessment system of dam's observed behavior, a new way for studying large dam's observed behavior assessment by means of applying fuzzy integrals assessment model is provided. The example shows that the method presented in this paper is reasonable and feasible.
Flexible coordinate system is introduced into theodolite industrial measurement, so there aren't errors of instruments levelling and relative orientation in self-locating of the system. Two solutions of self-locating parameters of the coordinate system are given and their accuracies are analyzed.
In this paper, a further discussion on the LEGE method is given. It is proved that RX=V is the non-degenerate linear transformation of AX=f, and the results of locating and evaluating gross errors are the same both in terms of AX=f and in terms of RX=V. In addition, the improved searching method for locating and evaluating gross errors is presented.
The estimation method of variance components which are under the influence of the initial datum error is presented. Coupled equations of calculating the variance components estimation as the influence of the initial datum error is taken into consideration and the formula which is used for computing the estimate value of the standard error of unit weight are put forward. In the end, an instance is cited to illustrate that the influence of the initial datum error on the estimation of variance components should not be omitted when it is biggish.
In order to meet the needs of users and to improve the data processing function in control surveying,we have proposed two algorithms in this paper based on graph theory.According to the observation file of control network,one is the step-by-step back-substitution algorithm,with which a set of least independent close loops in control network can be produced automatically.And the other in called combination algorithm,which is used to produce the connecting traverses.The corresponding program is developed.Finally,illustrations are given to show that the proposed algorithms are valid and effective.
Fresnel diffraction intensity patterns are computed where Gaussian plane waves with various spot size and transverse displacement are truncated by a slit.The correlation coefficients of these pattern curves and that one of uniformly planar waves are calculated.The gravity center coordinates of these patterns and the fit formula of space loci of the gravity centers are investigated.
The analytical photo-positioning apparatus JWP01,as a vehicle-borne instrument,works in a rough environment and is required to have high reliability.The reliability of the electrical part has been considered when the instrument is designed.Based on the discussion of the designs aiming at the reliability of the electrical part of the instrument the self-detection issues are discussed.
In this paper,a design for field-sequential stereoscopic display system is presented.The hardware is connected to computer through PCI bus.It can capture and display image pairs which are directly from cameras in real time.Then through a liquid crystal shutter,a 3D image can be seen.
This paper presents a fast method implementing the identical address operation in the decimation-in-time FFT and the decimation-in-frequency FFT. An example of the one dimension FFT is cited to state how to apply this method. The program of the example in C language is shown.
Traditional evaluation of investment mainly relies on analysis by determining the nature whose result can only reflect a certain tendency.So it is very difficult to provide accurate and scientific policy-making information.By means of system engineering this paper describes the process and result of investment-evaluation based on mathematical model which can avoid the deficiency of the traditional method
In this paper, the self-modeling regression model with shape invariance and multi variable is built up, its calculation is considered, and its application example with the education measure data is given. In this model, the general characters of the regression curves can be displayed, and the individual characters of the curves as well as the relationship between the curves can be showed.