البحث — المستودع الرقمي العراقي

نتائج البحث: 23 من أصل 23

دراسة توفيق انموذج بيز الهرمي بصيغة الانحدار لمنحنيات النمو كثيرة الحدود ذات المرحلتين : دراسة تطبيقية

اسم المؤلف: فاضل نايوخ خيزران

اسم المشرف: حمزة اسماعيل شاهين

الموضوع العام: الادارة والاقتصاد

السنة: 2004

الموضوع الدقيق: الاحصاء

الدرجة: ماجستير

الجامعة: الجامعة المستنصرية

اللغة: العربية

مكان الجامعة: بغداد

الصفحات الاولى:

التحليل الطيفي لمتسلسلة الحمض النووي (DNA)

اسم المؤلف: عمار كوتي ناصر الزيدي

اسم المشرف: صلاح حمزة عبد

الموضوع العام: الادارة والاقتصاد

السنة: 2004

الموضوع الدقيق: الاحصاء

الدرجة: دكتوراه

الجامعة: الجامعة المستنصرية

اللغة: العربية

مكان الجامعة: بغداد

الصفحات الاولى:

تحديد الاحتياجات من القوى العاملة تحت ضغط الترقية الوظيفية في الشركة العامة لتوزيع كهرباء بغداد

اسم المؤلف: امينة كريم عيسى السوداني

اسم المشرف: عبد الرحيم خلف راهي الحارثي

الموضوع العام: الادارة والاقتصاد

السنة: 2004

الموضوع الدقيق: الاحصاء

الدرجة: ماجستير

الجامعة: الجامعة المستنصرية

اللغة: العربية

مكان الجامعة: بغداد

الصفحات الاولى:

مقارنة طرائق تقدير معالم انموذج ويبل للفشل بثلاثة معالم == Comparing Estimation Methods of Weibull Failure Models With Three Parameters

اسم المؤلف: فراس صدام عبد الهلالي

اسم المشرف: صباح هادي عبود الجاسم

الموضوع العام: الادارة والاقتصاد

السنة: 2004

الموضوع الدقيق: الاحصاء

الدرجة: ماجستير

الجامعة: جامعة بغداد

اللغة: العربية

مكان الجامعة: بغداد

الصفحات الاولى:

المستخلص: لقد كان الاهتمام الواسع والمتزايد بدراسة موضوع المعولية، يعود الى التطور التكنولوجي والتقني السريع واستخدام الانظمة الالكترونية المعقدة في مختلف المجالات.وعلى هذا الاساس فان دراسة موضوع المعولية والربط بين الجانبين النظري والتطبيقي امر له اهمية كبيرة، | The rapid and wide significance of the theoretical and practical aspects of reliability is due to the technical and technological advance in using the various intricate electronic systems. In this regard, it is important to study the theoretical and practical sides of reliability and their interrelationship since it is an indication to the proficiency and capability of the system component without deficiencies for a long time. This will lead us to evaluate the operation of the system component for improving and increasing the quantity and quality of these systems in addition to its role in the development of the engineering system.The wiebull distribution is used, as a model for failure since this distribution is proper when the failure rates somewhat high in starting operation. These rates will be decreased with increasing time. Thus, the study deals with the comparison between estimating parameter and reliability function of the three parameters Weibull Distribution as a model for failure. Different Approaches have been used to carry out the research these include : 1. Classical approachesa. Maximum likelihood method. b. Moment method.2. Baysian approachesa. Bayes method.b. Shrinkage method.Comparison was made between the methods of estimation by employing simulation using Monte - Carlo method using the statistical measures (MSE) and (MAPE) to identify the priority of these estimators for different sample sizes. The study is divided into four chapters, Chapter one deals with the theoretical Background of the topic, including the concepts of reliability. Chapter two is a review of the different estimation methods and aspect s of reliability. Chapter three is devoted the practical side of this research and results analysis. Chapter four reveals the conclusions, findings and the recommendations of the study

ايجاد التوزيع الاحتمالي للطلب خلال فترة الانتظار للمواد المخزنية في شركة تعبئة الغاز == Finding The Probability Distribution of Lead Time Demand For The Inventory Items In Gas Filling Company

اسم المؤلف: علي هشام عبد الرسول السعدي

اسم المشرف: عماد حازم عبودي

الموضوع العام: الادارة والاقتصاد

السنة: 2004

الموضوع الدقيق: الاحصاء

الدرجة: ماجستير

الجامعة: جامعة بغداد

اللغة: العربية

مكان الجامعة: بغداد

الصفحات الاولى:

المستخلص: يعد ايجاد التوزيع الاحتمالي للطلب خلال فترة الانتظار من اهم واعقد المشاكل التي تواجه العاملين في مجال السيطرة على الخزين وذلك عندما يكون الطلب او فترة الانتظار او كلاهما متغيرا وبشكل خاص عندما تكون فترة الانتظار طويلة.غالبا ما تستخدم توزيعات ثنائية | Probability distribution for lead time demand is considered the most important and complex problem that is faced by those who work in inventory control when demand or lead time or both of them are not fixed specially when the lead time is long.In common two parameters distributions are used to represent lead time demand, for example Gamma distribution and lognormal distribution. Although these distributions are some what flexible in representing this variable (i.e. lead time demand), it does not cover all cases.Thus, three parameters distributions are used in addition to that two parameters distributions to represent lead time demand. These three parameters distribution are more flexible and take different forms, consequently they are more compatible to cover more cases.This study consists of four chapters; the first one is a historical review and previous studies of some researchers who worked in probabilistic models for inventory control. The second chapter is a theoretical part that discusses some important conceptions which are used in inventory control and display the most important specification and characteristics of some important distributions to represents demand, lead times and lead time demand, that is the later is the most important to compute different inventory measures, which is limited on re - order level and protection level in this thesis. In addition it shows estimation of distributions parameters by using moment method and Maximum likelihood.The third chapter is the experimental part which tackles the analysis of actual monthly data and lead times data measured by month to find best probability distribution to these data. Then, mix demand data with lead time data. Thus, we get demand data during lead time. These data are tested to get probability distribution which represents them. This distribution depends on computing re - order level in specific protection levels.The forth chapter discusses the most important conclusions of this thesis and recommendations are suggested to the future studies.Further to that, the thesis contains a programs in Pascal language to get use of it to generate lead time demand data, and to test goodness of fit of data and computing re - order level according to lead time demand distributions.

النماذج الاحصائية وتطبيقات الشبكات العصبية : دراسة مقارنة

اسم المؤلف: علي عبد الحافظ ابراهيم الشيخلي

اسم المشرف: حذامة رزوقي حسن | اموري هادي كاظم

الموضوع العام: الادارة والاقتصاد

السنة: 2004

الموضوع الدقيق: الاحصاء

الدرجة: دكتوراه

الجامعة: جامعة بغداد

اللغة: العربية

مكان الجامعة: بغداد

الصفحات الاولى:

مقارنة الاساليب المستخدمة في تحديد عدد المركبات الرئيسة مع جانب تطبيقي == The Comparison of Methods Used In Determining The Principal Components Number With An Applied Aspect

اسم المؤلف: زينة ياوز عبد القادر

اسم المشرف: دجلة ابراهيم مهدي العزاوي

الموضوع العام: الادارة والاقتصاد

السنة: 2004

الموضوع الدقيق: الاحصاء

الدرجة: ماجستير

الجامعة: جامعة بغداد

اللغة: العربية

مكان الجامعة: بغداد

الصفحات الاولى:

مقارنة اساليب بيز مع طرائق اخرى لتقدير منحنى الانحدار اللامعلمي == A Comparison of Bayesian Approaches With Other Methods For Estimating Nonparametric Regression Curve

اسم المؤلف: خلود يوسف خمو يوسف

اسم المشرف: ظافر حسين رشيد النجار

الموضوع العام: الادارة والاقتصاد

السنة: 2004

الموضوع الدقيق: الاحصاء

الدرجة: دكتوراه

الجامعة: جامعة بغداد

اللغة: العربية

مكان الجامعة: بغداد

الصفحات الاولى:

المستخلص: لقد شهدت طرائق الانحدار اللامعلمي اهتماما ملحوظا في السنوات الاخيرة كان السبب في ذلك هو ان التفكير المعلمي الصرف المستخدم في تقدير منحنى الانحدار لا يتوافق مع المرونة في تحليل البيانات.ومع التطور المنجز في اجهزة الحواسيب من الناحية المادية وكذلك انجاز | In recent years, too many considerations have been given for the Nonparametric Regression methods. This is for the reason that the concept of pure parametric; used for the estimation of Regression curve, does not cope well with the flexibility needed for data analysis.With the progress made in computer machines, in terms of economy and running performance, it has become possible to develop many of Nonparametric Regression methods theoretically. Though many of these are still under perfection, and facing a number of problems.Hence we see the importance of focusing on methods related to smoothing of Nonparametric Regression functions. This is for the purpose of producing the best methods convenient for various models. And for the Distribution Random error, in its two cases; Normal and Contaminated. Thus, the most important purpose of the research, is to find what the studies so far, have offered in the field of Nonparametric Regression. Also to find alternative or modified methods; which are reliable for the treatment of conditions of failure regarding the methods in use, as well as to alleviate the complexity of some methods, especially those related to Bayesian procedures.One of the most outstanding aims of the research focuses on the study of Nonparametric Regression using Bayesian variable selection. This suggests a modified technique to be reliable and of less complexity than the original one.Amongst the other research intentions, when data are contaminated with outliers, is to explore the Robust Nonparametric Regression, using Bayesian variable selection method. Also to suggest a modified Bayesian method; resistant to outliers, and of less complexity than before transformation. As well as offering suggested methods for Robust Nonparametric Regression. This is of the feature of having less sensitivity towards outliers and reliable in comparison to very few techniques supplied with robustness, as the Bayesian approach.A simulation model has been performed with different distributions, for the random error and for a number of models.To verify the performance of such methods, many criteria have been carried out.To satisfy the purpose of this research, the study has been divided into five chapters. Chapter I consists of an introduction, the problem under research, its importance and purposes. It also covers a literature survey. Chapter II covers methods for smoothing Nonparametric Regression. While chapter III is devoted for Nonparametric Regression and Robust Nonparametric Regression using Bayesian variable selection method. Also in this chapter are details of the suggested methods. Then chapter IV implements the experimental part of the study. Finally chapter V comprises the conclusions and suggestions that the research has recommended. As well as the future studies, which have been proposed regarding this research.

افضل طرائق المعاينة في تقدير اعداد النخيل في محافظة البصرة == Optimum Sampling To Estimate Date Palm In Basrah Governorate

اسم المؤلف: حنان سعيد مالك الراوي

اسم المشرف: رفعت لازم مشعل الخميسي | عدنان شهاب حمد

الموضوع العام: الادارة والاقتصاد

السنة: 2004

الموضوع الدقيق: الاحصاء

الدرجة: ماجستير

الجامعة: جامعة بغداد

اللغة: العربية

مكان الجامعة: بغداد

الصفحات الاولى:

المستخلص: مما لاشك فيه ان لكل اسلوب من اساليب المعاينة مزايا ومبررات في استخدامه، وغالبا ماترتبط عملية اختيار اسلوب المعاينة بجانبين اساسيين، اولهما معيار التجانس بين المفردات سواء على المستوى الكلي ام على مستوى اجزاء(او مجاميع) من المجتمع، وثانيهما الامكانات المتا | There is no doubt that each technique of sampling techniques has advantages and reason for using it, and mostly the correlation of choosing sampling technique with a essential two sides, first of them is the standard of homogenous between units as for all population, and the second one is the abilities that are available to fulfills survey. And in using Stratified Random Sampling Technique in evaluating the suitable population to apply an important role to get a high efficiency estimator to compare with other Sampling design. As the target of this searching is to get the best ways that increase the accurate estimation of the Date Palms number in Basrah governorate and in using different kind of sampling estimator, the comparison has been done between the mean variance of Simple Random Sampling and the mean variance of the Stratified Random Sampling, and it is clear in the comparative results hat using Stratified Random Sampling give the best estimation. The determination of strata boundaries (strata formation) have interested role in obtaining efficient estimators, several strategies of strata formation were constructed, it is proved that the approximated frequency strategy at ?= ½ is the most efficient, researchers discussed developing this strategy through using different values of (?), or different sample allocations. In this searching three approximately frequency had been applied , and to divide the population into strata and point out the optimum limit strata, and the sample allocation has been determined by using Neyman distribution. And it is clear in the result that using the approximated frequency is the nearest and efficient to estimate the Date Palms number in Basrah governorate, by counting the Stratification mean variance and the stratification mean for the three approximated frequency. And the reason to know wither the Stratified Random Sampling is efficient and better than the Simple Random Sampling in evaluating the Date Palms number the experiment of the hypothesis between two population has been used, the results of that experiment show the difference between the two means that lead to reject the Null hypothesis and to accept the Alternative hypothesis, according to this the search recommended to use the Stratified Random Sampling according to the new divided stratification by using frequency, taking into consideration using Neyman distribution o determine sample size and sample allocation

طرائق تقدير عدد مرات الفشل في الانظمة القابلة للاصلاح

اسم المؤلف: ثائر فيصل شاهر

اسم المشرف: عبد المجيد حمزة الناصر

الموضوع العام: الادارة والاقتصاد

السنة: 2004

الموضوع الدقيق: الاحصاء

الدرجة: دكتوراه

الجامعة: جامعة بغداد

اللغة: العربية

مكان الجامعة: بغداد

الصفحات الاولى:

استخدام توزيعي بيتا والاسي في تقدير معالمات انموذج الانحدار الخطي == Use of Beta & Exponential Distributions To Estimate The Parameters of The Linear Regression Model

اسم المؤلف: اسامة محمد جاسم القصاب

اسم المشرف: اموري هادي كاظم الحسناوي

الموضوع العام: الادارة والاقتصاد

السنة: 2004

الموضوع الدقيق: الاحصاء

الدرجة: دكتوراه

الجامعة: جامعة بغداد

اللغة: العربية

مكان الجامعة: بغداد

الصفحات الاولى:

المستخلص: تبقى عملية التقدير لمعلمات انموذج الانحدار من المواضيع المهمة رغم كثرة ما كتب عنها من خلال البحوث والدراسات وهذه الدراسات تختلف باختلاف الاساليب المتبعة في عملية التقدير سواء كان هذا الاسلوب تقليدي او بيزي او تبعا للتوزيعات التي يتم توظيفها في عملية التق | the process of estimating the parameters of regression model , is still still one of the important subjects despite of the large number of papers and studies written in this subject , these studies are differ in techniques followed in the process of estimation , whether they are classic or baysian , or according to the distributions applied in the estimation , and which are available about some of the parameters of regression model.In this thesis , two different distributions are applied ( Beta , Exponential )in estimating different sample sizes and then making a comparison among the classic estimation techniques represented by (OLS) method , and the method of applying one distribution or two (u.d) , and the baysian methods by providing the distributions themselves.By using the simulation technique , results has been obtained to provide the researcher with the image to clarify the best method in the estimation technique.This thesis come in four chapters : The first chapter contains the introduction and the background of the subject.The second chapter contains the theoretical basis of the estimation methods, when one or two distribution are applied in estimation technique whether is the classic or baysian method, it also contains all that related to derivation process to obtains the estimation style.The third chapter contains , a display of the practical side and also a display of the results of the simulation process used to reach to the best techniques of estimation.Finally, the forth chapter contains the conclusions and recommendation as well as future studies.