共查询到20条相似文献，搜索用时 468 毫秒
1.
The authors determine the index system and the index weight of capability of real estate by applying Delphi method and AHP method, and found the fuzzy comprehensive evaluation model of capability of real estate. They creates the model of capability Vs. price based on value engineering theory. The authors analysis detailedly deciding method of capability Vs. price of real estate combined with a practice example and application. The method adapts to a house as well as the type of the house. The method resolves the problem which capability Vs. price of real estate was only described by qualitatively for ages, which supplies theory basis to developer and consumer. 相似文献
2.
Based on the complex geological environment and hydro-geological conditions in mountainous areas the fuzzy comprehensive evaluation index system of the mine geological environment is constructed. It uses the weak fuzzy consistent matrix and analytic hierarchy process to calculate the weight, which solves the question that traditional AHP is difficult to meet the consistency test. According to the special geological conditions of the mine, it divides the impact of the geological environment into three levels, builts the fuzzy comprehensive evaluation table and determines the membership degree of the influencing factors. Combined with fuzzy comprehensive evaluation method, it developes a second-order fuzzy comprehensive evaluation model of the impact of the mine geological environment. By means of the application of this model to the actual mining, it shows that the evaluation results of the model are highly similar to the actual results of the impacts of landslides, land subsidence and other geological disasters. 相似文献
3.
The improved geometrical constraint model of open-pit mine boundary optimum and its application 总被引：1，自引：0，他引：1
This paper develops the improved geometric constraint model (IGCM) based on the 3D block model. The variable-slope excavation cones of each block have been abstracted to collections of nodes and directed edges, and the optimization method has been introduced using the set theory. The IGCM consists of the optimized collection nodes and directed edges. The algorithm based on IGCM has been actualized in DIMINE digital mine system, and is applied to an actual open pit mine boundary optimization engineering. The results shows that IGCM can accurately simulate variable slope angles in any azimuth and elevation changes, and adapt to all open pit mine boundary optimum problems in any complex geological conditions, calculation speed and accurate. It provides a new and effective method for the variable-slope open pit mine boundary optimization problem in complex geological conditions. 相似文献
4.
This paper presents a mathematical and mechanic model for non-linear dynamicstability analysis of structures on the basis of Liapunov's stability criteria. Due to the complexityand difficulty in numerical calculation,a matrix function to this type of stability problems is selectedand the programing formulations are derived.Applying the method to beam or frame structures un-der the axial period loadings,the geometric non-linear dynamic stability results are obtained.Fromthe results,the basic characteristics of this type of probtems,especially the non-linear effect areshown.The model and matrix function method are valtiable both in theory and in practice for struc-tural non-linear dynamic stability. 相似文献
5.
Erosion Optimized Diagnosis of Brand Grounding Grid 总被引：1，自引：0，他引：1
To find the corrosion of the grid ,large area cutting has been adopting in practice for a very long time. But this method is blind, difficult and influences the system operating. The erosion diagnosis method in the past is effective for the smaller grid. To the brand ones, it can not take effect. The method of separating the grounding grid into several parts and diagnosing step by step is discussed by lots of simulation about middle or brand grounding grid erosion diagnosis. This method makes the brand grounding grid erosion diagnosis quick and truly without power cut and digging large area, satisfies the demand in practice. Putting this optimized diagnosis method into practice , the result is good. 相似文献
6.
WEN Chang-ping 《保鲜与加工》2007,(3):70-74
Aiming at expansive soil judgment in Xiangtan-Shaoyang Expressway, the attribute recognition model based on objective weight is developed in this paper. The verification and application of this model indicate that the methodology is coherent to that of the Specifications for Design of Highway Subgrades and the fuzzy synthetic evaluation method. Because the attribute recognition theory would well determine some kind of synthetic evaluation problem with fuzzy attributes and its confidence criterion is developed in terms of some evaluation sets with ordered characteristics, furthermore,this model uses objective weight as the weight of the evaluation indices, decreases the subjectivity of weight decision, and ensures the objectivity of evaluation, thus the evaluation results are much more reliable. 相似文献
7.
The edge finite element method and the imaging visualization have been studied in the forward problem of magnetic induction tomography MIT with homogeneous sinusoidal magnetic excitation. The definite equations of the forward problem were established using the electric field intensity as the vector variable. The edge FE method for solving the definite equations was introduced in detail and realized as the MATLAB program. In order to realize the visualization of MIT in imaging the intracranial hemorrhage, a real human brain finite element model was created with the human head MRI data. On the basis of this model, we realized the 3D visualization of MIT imaging in MATLAB. The research results demonstrated the validity of the definite equations and the edge FE method in calculating the forward problem. And the 3D visualization of MIT imaging with real human brain model established a foundation for the application study of MIT in imaging intracranial hemorrhage. 相似文献
8.
In the process of underground mining,as the effect of mining method and mining technology,massive goafs have been formed in underground mines,which is the main factor influencing the goafs stability in underground mining. Generally,there are four main factors to affect the goafs stability,i.e. structure parameters,space distribution features,stress environment and characteristic value,and geological condition and mechanical parameters of ore and rock mass. There are the sources of the stability identification of goafs based on the multiple source information. Based on CMS technology and engineering geology survey,numerical simulation technology,and using the AHP weight analysis,a D-S evidence classification model is built based on the multisource information fusion in the goafs stability. Take a mine as example,the mining information and the parameters are collected,and the classifications of goafs stability are identified according to a four grade classification method. The result shows that the stability is relative to the structure parameters,geological parameters and the stress environment parameters of goafs. It is a typical problem of the multisource information fusion. Using D-S evidence theory,the classification of the goafs stability is identified,and the results are consistent with the goafs stability in the engineering recognition. It is an effective approach to indentify the classification of the gaofs stability involving many factors. 相似文献
9.
For the requirements of interior space fire early automatic positioning,the traditional positioning method is improved based on machine vision technology. A simple and practical plane calibration board is designed for camera calibration,and the problem of fastly and automatically extracting the pixel coordinates of the feature points on the calibration board is solved by using Halcon. For the limitation that the traditional method only considers radial distortion,a more comprehensive model of camera distortions is established. The homography matrix and distortion coefficient are got and optimized with imaging model and distortion model by iteration and space positioning is realized by three-dimensional reconstruction. The method has been applied in a fire gum project and the results suggest that the improved method is effective,fast and accurate. 相似文献
10.
On current network actuality and development trend, it is necessary to put traffic engineering in practice in IP backbone network on IP/MPLS. The essential demand in actualizing traffic engineering is traffic matrix measurement. After analyzing the defect of current measurement method, traffic engineering model and traffic matrix on LSP in IP backbone network based on MPLS, or relevant routing algorithm are researched. The merit of the traffic matrix's measurement method is that implement of measurement is only located in the edge node; therefore, network resource's cost is lower and it offers a new train of thoughts for resolving the flaw of current main measurement methods, moreover, and condition for actualizing traffic engineering. 相似文献
11.
Aiming at the problem that nail’s melting time in slab isn’t been taken into consideration for measuring method of solidified shell by nail-shooting technique, the mathematical model of heat transfer for nail in slab is built, and the process of nail melting in slab is simulated by the finite element software MSC.Marc. The revising method and formula are proposed. The differences 0.5% and 1.2% for solidification coefficient and solidification ending fore and after revising are analyzed by instance. It shows the calculation of solidification coefficient and solidification ending is more exact due to adapting the revised method. 相似文献
12.
In this article, modal analysis technology about dynamic analysis was studied. Free interface model comprehensive method was used to dynamic analysis and design of automobile structure based on theory background of model analysis, test technology conditions, data reliability and precision. In order to test the efficient and possibility of the method, main vibration features about space double layer has been calculated based on this method, comparing this with the precise solution of finite element method, the result shows that this method is suitable not only for simple interfaces between components but also for high reductive interfaces. In addition, the method also has high comprehensive precision. Furthermore it creates conditions to dynamic analysis in automobile structures. 相似文献
13.
To analyze the safety of elevator system quantitatively, the risk factor weights aiming at the risk evaluation for elevator system are analyzed based on Analytic Hierarchy Process (AHP) in this paper. The Accident Tree Analysis (ATA) is also introduced to analyze accidents leading to the dangers during elevator running as the basis of weight assignment. The risk evaluation model of elevator system is built and its safety grade is set. The quantitative assessment for elevator system through linear weighted sum law is implemented. This method combining AHP and ATA in this paper avoids subjectivity and one-sidedness of weights indexes caused by expert-scoring method. This elevator system risk evaluation system provides feasible method of assessing safety grade subjectively. 相似文献
14.
Li Runfang Li Yusheng 《保鲜与加工》1993,(1):96-101
A new finite element method is presented in this paper to analyze the thermo-
elastic contact problem with heat input on meshing tooth faces. The computational model of meshing gear has been established and the frictional heat input on meshing tooth faces is estimated. In addition, 2-D finite element analysis program for this kind of problem is listed. The test and practical examples are given to show the validity and versatility of this method. 相似文献
15.
After reform of state -owned firms mechanism, many companies appeal for ESO, but there have not been any clear theories for operation in practice until now. On the basis of principal-agent theory of the firm, this paper regards owners and managers as the two sides to game and builds the game model which analyses the behaviors of owners and managers. As a long-term stock based incentive system, ESO will align the goal of owners and managers and make them reach Nash Equilibrium to maximize their utility, and lower agency cost to solve the agency problem in modern firms. 相似文献
16.
The mathematic model of solidification heat transfer process in continuous casting strand is useful for quantitatively analyzing heat transfer in continuous casting process, quality control and process control. The heat transfer in continuous cast strand in crystallizer and secondary cooling zone have been analyzed. The attention has been paid to basic logic and methodology in model building up. Typical methods determing solution condition and parameters for the model have been discussed. Some numerical methods at the present time for solving solidification heat transfer model, such as finite difference method, finite-element method and boundary element, have been investigated comparatively. In the future, working on solidification heat transfer model, which is more practical, and the integration of the control model will play an important role in the development of high efficiency continuous casting technology. 相似文献
17.
In this paper,a numerical model of a three dimensional human torso has been presented.In this model,the torso part including anisotropic muscle layers has been discretized by means of the finite element method(FEM).The rest of torso have been divided into the surface elements by the boundary element method(BEM).This discretized model can be used in the field such as the forward problem and the inverse problem of the electrocardiogram(ECG). 相似文献
18.
The goal of AHP Grey Relational Analysis model is to solve problems during selecting the best waterworks sludge treatment process.And grey Relational Analysis is to confirm the compactness between the ideal process and candidate process.Moreover, weighting system was determined by the three mark matrix and consistency analysis of judgment matrix for traditional AHP was improved by the optimum transfer matrix.Base on these theories, AHP GRA model was established.A case study was addressed with the selection of waterworks sludge treatment process in Chongqing.It is found that this model is legitimate and credible. 相似文献
19.
It is proposed to introduce approximate model method to crashworthiness optimization design of thin wall beam,and the approximate model can be optimized by using sequential response surface method.In order to solve the parameterization design problem of finite element model,a parameterization model about material,cross section size and spotweld of thin wall beam is established by developing corresponding procedures.The results show that optimization design can not only improve the performance of absorbing energy of thin wall beam,but also reduce the weight greatly;the approximate model method can greatly improve optimization efficiency. 相似文献
20.
Determination to Weighting Coefficient of Combination Forecast Based on Rough Set Theory 总被引：1，自引：0，他引：1
The problem of determination to weighting coefficient is a key and difficulty for combination forecast. A method of determining weighting coefficient based on rough set theory is showed in this paper. Determining weighting coefficient is translated into estimating significance of attributes among rough set. A relation data model about combination forecast is established. Knowledge systems are built through making attribute value into eigenvalue. Under data moving, the weighting coefficients of a combination forecast model are computed by analyzing the dependence and significance of forecasting method for the predicted object. The proposed approach overcomes the subjectivity of traditional determination to weighting coefficient, avoids computing linear or nonlinear extremum problem and makes combination forecast more objective. The validity of the proposed approach is verified with a case. 相似文献