نتایج جستجو برای: principal constituents analysis pca

تعداد نتایج: 2930818  

Journal: :iranian journal of public health 0
r noori dept. of environmental engineering, graduate faculty of environment, university of tehran, iran ma abdoli dept. of environmental engineering, graduate faculty of environment, university of tehran, iran m jalili ghazizade dept. of environmental engineering, graduate faculty of environment, university of tehran, iran r samieifard dept. of environmental engineering, graduate faculty of environment, university of tehran, iran

background: municipal solid waste (msw) is the natural result of human activities. msw generation modeling is of prime im­portance in designing and programming municipal solid waste management system. this study tests the short-term pre­diction of waste generation by artificial neural network (ann) and principal component-regression analysis. methods: two forecasting techniques are presented in...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه رازی - دانشکده علوم 1390

چکیده در این پژوهش منشاء خزندگان را مورد بررسی قرار داده، خانواده های سوسماران را در ایران معرفی نموده و ویژگی های آنها را ذکر کرده ایم، علاوه بر این نکات، اهمیت تغییرات در وضعیت سیستماتیک mabuya (sensu lato) را بررسی کردیم. خانواده scincidae را از نظر فیلوژنی، رده بندی و همچنین جنس های آن را، مرور کرده ایم. جنس trachylepis fitzinger, 1843 که هدف اصلی پژوهش حاضر است در ایران دارای سه گونه می ب...

Journal: :CoRR 2013
Yanshan Wang In-Chan Choi

The prediction of a stock market direction may serve as an early recommendation system for short-term investors and as an early financial distress warning system for long-term shareholders. In this paper, we propose an empirical study on the Korean and Hong Kong stock market with an integrated machine learning framework that employs Principal Component Analysis (PCA) and Support Vector Machine ...

2007
Manolis G. Vozalis Konstantinos G. Margaritis

In this paper we examine the use of a mathematical procedure, called Principal Component Analysis, in Recommender Systems. The resulting filtering algorithm applies PCA on user ratings and demographic data, aiming to improve various aspects of the recommendation process. After a brief introduction to PCA, we provide a discussion of the proposed PCADemog algorithm, along with possible ways of co...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2005
shadi yadegar mahmoud reza pishvaie

in this article the methodology proposed by li and wang for mixed qualitative and quantitative modeling and simulation of temporal behavior of processing unit is reexamined and extended to more complex case. the main issue of their approach considers the multivariate statistics of principal component analysis (pca), along with clustered fuzzy digraphs and reasoning. the pca and fuzzy clustering...

Journal: :journal of rangeland science 2012
sedigheh zare kia hossein arzani mohammad jafari seyyed akbar javadi ali ashraf jafari

this study aims to assess the effect of grazing intensity on vegetation structure, soil nutrient concentrations and soil physical properties. the study was carried out in steppe rangelands of saveh, markazi province, iran. four sites with four grazing intensities including very high, high, moderate and non-grazed with the same ecological conditions were selected. to study various vegetation and...

Journal: :international journal of environmental research 0
m. gholamalifard department of environment, faculty of natural resources, tarbiat modares university, noor, mazandaran, iran a. esmaili sari department of environment, faculty of natural resources, tarbiat modares university, noor, mazandaran, iran a. abkar faculty of geodesy and geomatics eng., k. n. toosi university of technology, tehran, iran b. naimi faculty of geo-information science and earth observation (itc), enschede, the netherlands

remotely sensed imagery is proving to be a useful tool to estimate water depths in coastalzones. bathymetric algorithms attempt to isolate water attenuation and hence depth from other factors byusing different combinations of spectral bands. in this research, images of absolute bathymetry using twodifferent but related methods in a region in the southern caspian sea coasts has been produced. th...

2007
Esteban Garcia-Cuesta Fernando de la Torre Antonio J. de Castro

Estimation of the constituents of a gas (e.g. temperature, concentration) from high resolution spectroscopic measurements is a fundamental step to control and improve the efficiency of combustion processes governed by the Radiative Transfer Equation (RTE). Typically such estimation is performed using thermocouples; however, these sensors are intrusive and must undergo the harsh furnace environm...

Journal: :journal of ai and data mining 2015
a. khazaei m. ghasemzadeh

this paper compares clusters of aligned persian and english texts obtained from k-means method. text clustering has many applications in various fields of natural language processing. so far, much english documents clustering research has been accomplished. now this question arises, are the results of them extendable to other languages? since the goal of document clustering is grouping of docum...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه گیلان - دانشکده علوم پایه 1393

چاودار از گیاهان مهم خانواده poaceae به شمار می رود که بومی ایران می باشد. در این تحقیق ابتدا تنوع ژنتیکی 70 جمعیت از جنس چاودار (secale l.) که از نقاط مختلف ایران جمع آوری شده بود بر اساس 17 صفت کمی و 14 صفت کیفی ریخت شناسی مورد بررسی قرار گرفت. گونه ها و زیرگونه های این جنس با استفاده از روش تجزیه به مولفه های اصلی (principal component analysis, pca) و تجزیه تابع تشخیص(discriminant function a...

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