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Register a new userUsing the method of the Kernel Weibull density to estimate the survival function in the case of complete data
استخدام طريقة كثافة نواة وايبل في تقدير دالة الحياة في حالة البيانات الكاملة
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في هذا البحث تم تقدير دالة الحياة باستخدام ثلاث طرائق لا معلمية و هي طريقة كابلن مايير و طريقة نواة غاوس و طريقة نواة وايبل و ذلك اعتمادا على أسلوب المحاكاة و على بيانات حقيقية كاملة من الواقع, حيث اقترحنا طريقة جديدة لتقدير دالة الحياة و هي استخدام نواة وايبل و اختيار قيمة جديدة لعرض النطاق الأمثل, و التي لها دورا مهما في عملية التقدير.
In this research, we estimate the survival function by using three nonparametric estimation methods and is to the method of Kaplan and Meier, the method Gaussian Kernel and method Weibull Kernel. Depending on the method of simulation and a complete real data from reality. Where we proposed a new method to estimate the survival function is to use Weibull Kernel and choose a new value to the optimal bandwidth, which have an important role in the estimation process.
References used
Bowman, A. W. and Azzalini, A. (1997) - Applied Smoothing Techniques for Data Analysis. Oxford Science Publications
EBLING, C.E, (1997) - An introduction to reliability engineering and maintainability engineering. New York, McGraw-Hill companies
Härdle Wolfgang, Müller Marlene, Sperlich Stefan, Werwatz Axel, (2004). Nonparametric and Semiparametric Models. Berlin: Springer
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The aim of this research is to simplify the methodof getting Evapotranspiration
Potentielle (ETP) which forms the limit of water needs for crops . This was using done
some experimental Equation like Turc formula and Thornthwaite formula
(Thornthwa
ite, 1948) compared with the modified Blaney_ Criddle formula
( BlaneyCriddle , 1950) which is considered the basic formula in this research . Also , this
research aims to find a formula enables us to use (Pans evaporation) method (class A) as a
relative evidence to the need of watering in Lattakia by comparing it with the results of
Evapotranspiration Potentielle which are calculated by the modified Blaney _Criddle
method depending on climate data from Lattakia for fifteen years (2001 – 2015) .
The results of studying the correlation coefficient and how the experimental points
spread around the linear regression curve show that Turc gave the best approximaltion
result to the developed Blaney – Criddle formula with correlation coefficient (R=0.907).
After Turc formula there is Thornthwaite formula with correlation coefficient (R=0.846) .
On the other hand Pan class A method gave approximal results to the developed Blaney–
Criddle formula with correlation coefficient (R=0.925) and with good distribution of the
experimental points around the linear regressions straight.
So, in this study experimental conditions it could beased on Turc formula and Pan
class A method as the best approximation to the developed Blaney- Criddle formula to
define the water requirement of the agriculture crops in Lattakia.
يقدم هذا البحث تطوير لطريقة جديدة في التشفير تعتمتد على نوعين من الدوال الرياضية الأولى دالة النظائر الضربية والثانية طريقة فيجينير الكاملة تجعله أقدر على حماية النص المرسل أو الرسائل المبثوثة عبر وسائل الإعلام المختلفة , وذلك من خلال:
1. الاعتماد ع
لى طريقة فيجينير الكاملة.
2. استخدام دالة النظير الضربي(257 )F(X) = (AX -1 + B)mod
عناصرها (A, X , B) مصفوفات لها شروط خاصة بحيث تصبح قادرة على تشفير رسالة كاملة دفعة واحدة اعتمادا على حساب المصفوفات ذات المراتب العليا , مما يجعلها صعبة الكسر الأمر الذي يحافظ على أمن المعلومات داخل النصوص والرسائل المبثوثة.
3. قابلية تطبيق الطريقة حاسوبياً لتعطي نتائج سريعة و كبيرة .
Performance of NMT systems has been proven to depend on the quality of the training data. In this paper we explore different open-source tools that can be used to score the quality of translation pairs, with the goal of obtaining clean corpora for tr
aining NMT models. We measure the performance of these tools by correlating their scores with human scores, as well as rank models trained on the resulting filtered datasets in terms of their performance on different test sets and MT performance metrics.
In this work, we have been found explicit exact soliton wave solutions for Zeldovich
equation with time-dependent coefficients, by using the tanh function method with
nonlinear wave transform, in general case. The results obtained shows that these
exact
solutions are affected the nonlinear nature of the wave variable, it is also shown that this
method is effective and appropriate for solving this kind of nonlinear PDEs, which are
models of many applied problems in physics, chemistry and population evolution.
A common challenge in designing a wireless system is to overcome
the effects of the wireless channel, such as multi-path propagation,
and Inter-symbol Interference. and the ability of OFDM to combat
the effects of multi-path propagation made it th
e modulation of
choice for third and fourth generation networks.
In OFDM system we transmit data symbols on a large number of
subcarriers, and these data symbols exposed to changes in
amplitude and phase, caused of noise and frequency selective
fading and Doppler shift .
To get the transmitted data at the receiver we must cope with these
changes, so we need to know the channel response at every
subcarrier and every symbol, and for that reason we use PILOTS
and we use many methods to estimate the channel response depend
on pilots, and the most important channel is LMMSE Method.
We will discuss in these issue the wiener filtering method
(LMMSE) which give best performance but it is very complicated,
so we will use Discrete Fourier Transform (DFT) to reduce the
complexity of these method and we will study the BER and MSE in
both case when we use QPSK or 16QAM Modulation .
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