本文選題：BP神經(jīng)網(wǎng)絡　切入點：因子分析　出處：《云南大學》2015年碩士論文　論文類型：學位論文

【摘要】：綜合評價在社會經(jīng)濟各個領域有著廣泛應用,經(jīng)過多年的研究,逐漸形成了多種評價方法,每種方法有各自的優(yōu)點和缺陷,因此,一直處于不斷改進和完善的過程中。近些年來,隨著網(wǎng)絡的廣泛應用和發(fā)展,數(shù)據(jù)信息量日益增大,對綜合評價方法的發(fā)展提出了新的要求,因此對多指標綜合評價方法的研究更加有實際意義。 近年來比較流行的人工神經(jīng)網(wǎng)絡法,以其獨特的分布式處理能力、非線性處理能力、自學功能和容錯性等成為了解決復雜且難以建模問題的強有力工具。通過對數(shù)據(jù)的多次訓練,在輸出結果中直接對變量進行等級(類別)判定。在一定程度上彌補了以前許多方法過于依賴主觀判斷或客觀特定數(shù)據(jù)的不足,成為目前被廣泛應用的一種綜合評價方法。當指標過多時,為了提高網(wǎng)絡的學習能力,加快處理問題的速度以及增加評價結果的可靠性,需要對網(wǎng)絡模型進行簡化,可以配合統(tǒng)計方法對多指標進行有效降維,這樣可以縮小神經(jīng)網(wǎng)絡模型在處理較多指標時的結果偏差,使評價結果更加可靠。 將因子分析引入BP神經(jīng)網(wǎng)絡模型進行BP神經(jīng)網(wǎng)絡綜合評價方法的改進研究是本論文的主旨,具體的思路是先采用因子分析法將多指標進行降維,再運用BP神經(jīng)網(wǎng)絡模型進行綜合評價,將該模型應用到環(huán)境空氣質量的實證評價中,以國家2012年環(huán)境空氣質量新標準中提出的AQI法為評價參考,經(jīng)過試驗,驗證了因子分析-BP神經(jīng)網(wǎng)絡相融合的多指標綜合評價模型在環(huán)境空氣質量評價中具有實用性和可行性。同時,通過與單純使用神經(jīng)網(wǎng)絡模型作對比,進一步驗證了該方法的有效性。并且,該模型還可以進一步拓展應用到其他領域的類似多指標綜合評價研究中。
[Abstract]:Comprehensive evaluation has been widely used in various fields of social economy. After many years of research, various evaluation methods have been gradually formed, each method has its own advantages and disadvantages, therefore, In recent years, with the extensive application and development of the network, the amount of data information is increasing day by day, which puts forward new requirements for the development of comprehensive evaluation method. Therefore, the study of multi-index comprehensive evaluation method has more practical significance. In recent years, artificial neural network (Ann), which is popular in recent years, has its unique distributed processing ability and nonlinear processing ability. Self-learning and fault tolerance have become powerful tools for solving complex and difficult modeling problems. To a certain extent, it makes up for the deficiency of many previous methods that rely too much on subjective judgment or objective and specific data. In order to improve the learning ability of network, accelerate the speed of processing problems and increase the reliability of evaluation results, the network model should be simplified. It is possible to reduce the dimension of multiple indexes effectively with statistical methods, which can reduce the deviation of the results of the neural network model in dealing with more than one index, and make the evaluation results more reliable. It is the main idea of this paper to introduce factor analysis into BP neural network model to improve the comprehensive evaluation method of BP neural network. Then the BP neural network model is used for comprehensive evaluation, and the model is applied to the empirical evaluation of ambient air quality. The AQI method proposed in the new national standards for ambient air quality in 2012 is used as a reference for the evaluation. The feasibility and practicability of the multi-index comprehensive evaluation model based on factor analysis and BP neural network fusion in the assessment of ambient air quality are verified. At the same time, the model is compared with the neural network model. The validity of the proposed method is further verified. Furthermore, the model can be further extended to other fields of similar multi-index comprehensive evaluation research.
【學位授予單位】：云南大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：X823

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