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| 1 | Saddlepoint approximation based line sampling method for uncertainty propagation in fuzzy and random reliability analysis显示文摘For structural system with random basic variables as well as fuzzy basic variables,uncertain propagation from two kinds of basic variables to the response of the structure is investigated.A novel algorithm for obtaining membership function of fuzzy reliability is presented with saddlepoint approximation(SA)based line sampling method.In the presented method,the value domain of the fuzzy basic variables under the given membership level is firstly obtained according to their membership functions.In the value domain of the fuzzy basic variables corresponding to the given membership level,bounds of reliability of the structure response satisfying safety requirement are obtained by employing the SA based line sampling method in the reduced space of the random variables.In this way the uncertainty of the basic variables is propagated to the safety measurement of the structure,and the fuzzy membership function of the reliability is obtained.Compared to the direct Monte Carlo method for propagating the uncertainties of the fuzzy and random basic variables,the presented method can considerably improve computational efficiency with acceptable precision.The presented method has wider applicability compared to the transformation method,because it doesn't limit the distribution of the variable and the explicit expression of performance function, and no approximation is made for the performance function during the computing process.Additionally,the presented method can easily treat the performance function with cross items of the fuzzy variable and the random variable,which isn't suitably approximated by the existing transformation methods.Several examples are provided to illustrate the advantages of the presented method. | LI LuYi,LU ZhenZhou &SONG ShuFang School of Aeronautics,Northwestern Polytechnical University,Xi’an 710072,China | 2010 | Science China(Technological Sciences)2010，53，8： | 5 |
| 2 | Study on Fuzzy Comprehensive Evaluation of Simulation Schemes of Socio-economic Systems | WANG Zongjun(College of Business and Management Huazhong University of Science and Technology)Wuhan 430074, China | 1996 | Systems Science and Systems Engineering1996，6，2： | 2 |
| 3 | Fault Diagnosis of Machine Based on Fuzzy Reliability Theory显示文摘According to life analysis in reliability theory, certain diagnosis rules can be used to diagnose machines’ faults. On this basis, considering the indefiniteness in machine working states, the accurate diagnosis rule was extended to fuzzy diagnosis rule by using basic concepts and methods of fuzzy mathematics. The formulas of fault probability under different conditions were deduced. In the end, an example is given and the results of two methods were compared. | GU Bing-fang, WU Ju-fang, LIU Bin PLA University of Science and Engineering, Nanjing 210007, P. R. China | 2001 | International Journal of Plant Engineering and Management2001，6，2： | 1 |
| 4 | INVESTIGATION ON MAKING MEMBERSHIP FUNCTION OF WATER MASS FROM MIXING MODIFIED PROCESS显示文摘A water mass in the sea area under investigation is defined as a fuzzy subset in the discourse universe. Possible forms of membership function of water masses in the mixing modified process are discussed with the mixing theory for conservative concentration of sea water. It may provide bases for making membership functions. Results in this paper may be extended and applied to shallow water. Examples and discussion are given in this paper. | 李凤岐 苏育嵩 喻祖祥 王凤钦 | 1989 | 中国海洋大学学报(自然科学版)1989，27，S1： | 0 |
| 5 | Research on Method R_w for Discrete Membership Functions显示文摘In this paper, a number of concepts related to continuous membership function (CMFs) advanced in [2] are extended to discrete membership functions (DMFs) in the light of the characteristics of DMFs so that fuzzy reasoning method R. based upon CMFs suits the case of DMFs. | 崔宝灵 黄梯云 | 1998 | Journal of Harbin Institute of Technology(New Series)1998，5，2： | 0 |
| 6 | FUZZY MODELS FOR ESTIMATION OF SURFACE GROUND SUBSIDENCE显示文摘In this paper,the mathematical theory of fuzzy probability is used for theproblems of rock mass mechanics due to excavation,especially mining.A mathematicalmodel is developed for the movement and deformation of rock mass on the basis of theassumption that the displacement and deformation of rock mass is a fuzzy event,and fromthis model theoretical formulas are derived for calculating the displacement of rock massdue to excavationThe theories of both the two-and three-dimensional problems are developed and appliedto the analysis of engineering problems in excavation.The agreement of the theoreticalresults with the field measurements shows that our model is satisfactory and the formulaeobtained are valid and thus can be effectively used for predicting the displacements anddeformations and the safety evaluation of the buildings on the ground surface. | 李文秀 | 1990 | Systems Science and Mathematical Sciences1990，3，3： | 0 |
| 7 | Optimization of Membership Function for Fuzzy Control Based on Genetic Algorithm and Its Applications显示文摘y Control Based on Genetic Algorithm and Its ApplicationsTX1IntroductionMembershipfunctionisthebasisforfuzzylogictheorytoappli... | Shi Fei Zheng Fangjing (School of Automation) | 1998 | Advances in Manufacturing1998，，4： | 0 |
| 8 | Fuzzy ta/2 symmetries of straight chain conjugate polyene molecules显示文摘On the basis of our recent studies on the molecular fuzzy point group symmetry,we further probe into the more complicated planar one-dimensional fuzzy periodic molecules-straight chain conjugate polyene.Except for the fuzzy translation transformation,the space transformation of the fuzzy screw rotation and the glide plane will be referred to.In addition,other fuzzy point symmetry transformation lain in the space transformation is discussed.Usually there is a correlation between the fuzzy symmetry characterization caused by the transition of the point symmetry elements and by certain space symmetry transformation.For the molecular orbital,the irreducible representation component is analyzed besides the membership function of the fuzzy symmetry transformation.Also,we inquire into the relativity between some molecular property and the fuzzy symmetry characterization. | LI Yun ZHAO XueZhuang XU XiuFang SHANG ZhenFeng ZHOU Zhen CAI ZunSheng WANG GuiChang LI RuiFang | 2009 | Science China Chemistry2009，52，11： | 0 |
| 9 | A New Method for Extraction of Fuzzy Rules from Small Samples显示文摘Fuzzy netal network (FNN) is a new tool for extraction of fuzzy control rules from experimental data, butno such rule can be extracted directly from small samples. This paper presents a new approach to fuzzy rules andmembership function for small samples i. e. clustering by the Hebb differential competition rule and extending eachitem of sample information to the control point in its factor space while BP algorithm is applied to the study of factornetwork weights in it. This approach has ben successfully applied to the simulation of rainfall prediction. | 张勇 陈晓东 王昕 | 1999 | Journal of Harbin Institute of Technology(New Series)1999，6，1： | 0 |
| 10 | FUZZY RELIABILITY ANALYSIS OF STRUCTURE显示文摘IntroductionUncertaintiesandambiguitiesinvolvedinstruc-turalperformancehavebeentreatedwiththeuseofprobabilitytheory.Itis,howe... | 黄洪钟 须雷 胡宗武 | 1999 | Journal of Shanghai Jiaotong university(Science)1999，4，1： | 0 |
| 11 | Dimensional Analysis on the Perforation of Stiffened Plates by Projectiles显示文摘The phenomena attendant to the perforation of truncated oval shape projectile into multi-layered stiffened plates were investigated. Dimensional analysis was employed to give an empirical formula. Then a membership function was introduced to modify the empirical formula. The effects of initial velocities, base plate thicknesses, height and width of stiffener on residual velocities were explored. The predictions of the empirical formula are in reasonably good agreement with those of experiment and numerical results. All these results indicate that the empirical formula is capable of predicting the residual velocity of the projectile penetrating the multi-layered stiffened plates. | 宋卫东 宁建国 | 2007 | Journal of Beijing Institute of Technology2007，16，4： | 0 |
| 12 | AN INTELLIGENT PROCESSING OF ABNORMAL DATA IN THE DYNAMIC DATA SYSTEM显示文摘This paper deals with an important subject of rejecting the abnormal dataintelligently in the dynamic data system.Based on the principle of nearest neighbor of fuz-zy mathematics,an approach of mathematically abstracting the human thinking and phys-ical practice knowledge is discussed,a new method of automatic rejection of abnormal da-ta is then proposed.The experimental results show that the method is available to the practice. | 金炯华 杨垿 童宝义 | 1989 | Journal of Southeast University(English Edition)1989，6，2： | 0 |
| 13 | Fuzzy neural networks for arc welding quality control显示文摘Fuzzy Logic Control (FLC) is a promising control strategy in welding process control due to its ability for solving control problem with uncertainty as well as its independence on the analytical mathematics model. However, in basic FLC, the fuzzy rule relies heavily on the experts’ (e.g. advanced welders’) experience. In addition to this, the membership function for fuzzy set is non adaptive, i.e. it remains unchanged as long as they are determined by experience or other means. For welding process, which is time variable systems and strong disturbance exists in it, fixed membership function may not guarantee the required system performance, and attempts should be made to improve the system performance by adopting adaptive membership function. Therefore, the automatically determination of the fuzzy rule and in process adaptation of membership function are required for the advanced welding process control. This paper discussed the possibility by using the combination between FLC and neural network (NN) to realize the above propose. The adaptation of membership function as well as the self organizing of fuzzy rule are realized by the self learning and competitiveness of the NN. Taking GTAW process welds bead width regulating system as the controlled plant, the proposed algorithm was testified for such a process. Computer simulations showed the improvement of the system characteristics. | 李迪 宋永伦 井上胜境 | 2000 | China Welding2000，9，2： | 0 |
| 14 | DISCUSSION OF SOME CONCEPTIONS OF A WATER MASS BASED ON THE THEORY OF FUZZY SETS显示文摘The fundamental principle for differentiating water masses is a strict consideration of their relative 'interior homogeneity' and obvious 'exterior differences' with others in characteristics. The conceptions of water type, water mass and water system are dealt with on the basis of the theory of fuzzy sets. A proposal to apply the theory of fuzzy sets to define the water mass and its core, independent area, boundary and mixing area is put forward.As an example, the membership function of the surface water masses in the Yellow Sea and East China Sea in August, 1979, are considered. Their cores, independent areas, boundaries, mixing areas and the approximation degrees between different water masses are calculated respectively. The water masses are ranged according to their fuzzy degrees. | 李凤岐 苏育嵩 王凤钦 喻祖祥 | 1989 | 中国海洋大学学报(自然科学版)1989，27，S1： | 0 |
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