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نظم و ضبط

نظم وضبط
تنظیم بڑی چیز ہے اے اہلِ گلستاں
بکھرے ہوئے تنکوں کو نشیمن نہیں کہتے
کائنات جن اٹل اصولوں پر چل رہی ہے ان میں زیادہ اہم قانون نظم و ضبط کا ہے۔ کائنات کی لامتناہی اور بے کراں وسعتوں میں کوئی معمولی سی شے یا کوئی حقیر ساذرّہ بھی اس اصول سے مستثنیٰ نہیں ، نظام ِقدرت کے تحت مختلف مخلوقات کو جو ذمہ داریاں تفویض کی گئی ہیں وہ انہیں بطریقہ احسن انجام دے رہی ہیں۔ نظامِ شمسی کے اندر مختلف ستاروں اور سیاروں کی حرکت اور گردش کا جو قانون خالقِ کائنات نے مقرر کیا ہے۔ اس پر صحیح طریقے سے عملدرآمد ہو رہا ہے۔ زمین اپنے مقررہ ضابطے کے تحت محو گردش ہے۔ اسی طرح فضاؤں ، بادلوں کا سفر، در یائوں اور نالوں کی روانی، طغیانی، پہاڑوں کی آتش فشانی اور سمندر کے مدّو جزر وغیرہ کے جواصول اس حکیم مطلق نے مقرر کیے ہیں یہ سب چیزیں انہی قوانین کے مطابق کام کر رہی ہیں۔
قدرت کا تکوینی نظام (جونظم و ضبط کی بنیاد پر قائم ہے) انسان کی نظم و ضبط کی اہمیت کو سمجھنے اور اس پر عمل پیرا ہونے کی دعوت دے رہا ہے۔ کائنات کی مختلف اشیاء ہمیں یہ سکھاتی ہیں کہ قواعد وضوابط کی خلاف ورزی بہر حال نقصان دہ ہے۔ پانی کی مثال ہی لیجئے اگر پانی کی روانی کے لیے شہر کی حدود مقرر نہ کر دی جائیں تو وہ کناروں کو توڑ کر اِدھر اُدھر پھیل کر تباہی مچادیتا ہے۔ لہذا اسے نظم وضبط کے حصار میں رکھنا انتہائی ضروری ہے اگر ہم غور کریں تو یہ بات سمجھ لینا کچھ مشکل نہیں کہ نظم و ضبط اپنانے ہی سے سکھ اور سکون حاصل ہوتا ہے۔
دہر میں عیش دوام آئیں کی پابندی سے ہے
موج کی آزادیاں سامانِ...

شخصيت انسانى پر شہادتين كے قرآنى اثرات

Allah Almighty sent mankind in this world for His worship only. This is high right on humans those who keep the faith and belief in the one Supreme God and obey His orders. When they followed satanic powers, they forgot the eternal lesson of Tawheed (Oneness of Allah) and engaged Shirk (polytheism). It is the dogma of Oneness of Allah with which mankind gets tranquility and peacefulness in society and becomesconstructive and valuable for humanity. And when human left his belief on Allah, they germinate their negative role and made the society despicable. In this scenario Allah Almighty sends His prophets to those nations which create mess and fill the society with clutter. At that time prophets play their role as a bounty of Allah on human race. They purify people by their teachings granted by Allah and focus their attention to the eternal massage of God. So Eman (faith) on prophet hood considered as essential as belief on Oneness of Allah. Both these beliefs; Tawheed and Risallah effect human life prominently in such a way that man redevelops his whole personality and becomes a required sound character of Eman. Then worldly contamination cannot harm human being's decency and he becomes a felicitous character of vigorous society.

Applications of Compressed Sensing to Biomedical Imaging

The application of compressed sensing (CS) to biomedical imaging is exciting because it allows a reasonably accurate reconstruction of images from far fewer measurements. For biomedical imaging, CS can increase the imaging speed and consequently decrease the radiation dose. While the idea of CS has been used to reduce the acquisition time of magnetic resonance imaging (MRI), x-ray computed tomography (CT) and microwave imaging (MWI), unfortunately the computation time of image recovery has increased as the nonlinear CS reconstruction algorithms are fairly slow. Reconstructing high-dimensional signals or biomedical images from compressively sampled data is a fundamental challenge faced by the CS. In this dissertation, we propose a suite of novel CS recovery methods that can efficiently recover the Fourier encoded biomedical images (MRI, parallel-beam CT and MWI) from a small set of randomized measurements. The initial part of the current work presents CS based reconstruction of sub-sampled biomedical imaging modalities using projection onto convex sets (POCS) and separable surrogate functional (SSF) methods. The iterative shrinkage based SSF algorithm incorporates the linear estimate of the error to improve the reconstruction quality. It does not involve any matrix inversion and is used to estimate the missing Fourier samples of the original image by applying data consistency in the frequency domain and soft thresholding in the sparsifying domain. The idea of using hybrid evolutionary techniques for the sparse signal recovery is presented next. It proposes how to combine the heuristic techniques such as Differential evolution (DE), genetic algorithms (GA), and Particle Swarm Optimization (PSO) with v iterative shrinkage algorithms to faithfully reconstruct sparse signals from a small number of measurements. Based on the notion of GA, a modified POCS based algorithm is developed. This novel CS recovery technique uses two different estimates for the initialization and iteratively combines them to recover the original Fourier encoded image. In the last part, we use hyperbolic tangent function separately to develop a reconstruction algorithm and a non-linear shrinkage curve for thresholding. As the ?1-norm penalty is not differentiable, the proposed hyperbolic tangent based function is used to closely approximate the ?1-norm regularization by a differentiable surrogate function. Using the method of gradient descent, a simple update rule is developed. The algorithm is shown to perform well for one dimensional (1-D) sparse signal recovery as well as CS reconstruction of Fourier encoded biomedical imaging. The idea is further extended by using hyperbolic tangent based approximations for the soft-thresholding that provide flexibility in terms of its adjustable parameters. Besides using synthetic data, the effectiveness of the proposed techniques are also validated using the real data collected from the MRI and MWI scanners.
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