Uncertainty of structure can be classed into two different categories . one is stochastic uncertainty . the other is fuzzy uncertainty 結(jié)構(gòu)的不確定性分為兩類,一類為隨機性,另一類為模糊性。
The pavement system with the complicated structure is always considered as a large surface layer bearing on the infinitely deep foundation . due to complexity and variety of materials and stochastic uncertainty of load boundary condition , many mathematic and mechanic problems will occur in obtaining stress and displacement solutions of the pavement system 路面體系在構(gòu)造上比較復雜,它通常是一個大面層,支承在無限深的地基上,由于體系材料復雜性、多樣性和荷載邊界條件的隨機不確定性,在解算它的內(nèi)力、位移時會遇到很多的數(shù)學和力學上的困難。
This paper first presents the uncertainty of water resources and the process of fuzzy set theory in this field , then analyzes the current conditions of agricultural water resources and its sustainable developments in our country . based on the researches in this field , considering its character of multi - objective , multi - layer , multi - function and multistage , this paper mainly deals with the fuzziness and stochastic uncertainty of agricultural water resources system . the major contents and research results are as follows : 1 based on chen shouyu ' s fuzzy set theory , this paper presents a fuzzy optimal multi - dimension and multi - objective dynamic programming model , then two methods are given 本文首先闡述了水文水資源的不確定性及模糊水文水資源學的發(fā)展現(xiàn)狀,分析了我國農(nóng)業(yè)水資源現(xiàn)狀及其可持續(xù)利用,在論述區(qū)域農(nóng)業(yè)水資源優(yōu)化領域研究現(xiàn)狀的基礎上,鑒于農(nóng)業(yè)水資源系統(tǒng)優(yōu)化的多目標、多層次、多功能、多階段、多維與隨機的特征,針對系統(tǒng)中普遍存在的模糊性和隨機性開展研究,主要研究內(nèi)容和研究成果概括如下: 1 、基于陳守煜提出的多目標模糊優(yōu)選動態(tài)規(guī)劃理論,提出復雜水資源系統(tǒng)的多維多目標模糊優(yōu)選動態(tài)規(guī)劃問題的兩種求解辦法:多維多目標的決策序列相對優(yōu)屬度總和最大法和多維多目標階段模糊優(yōu)選動態(tài)規(guī)劃方法。