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باب اول: قرآن حکیم میں آیاتِ استفہام کی اہمیت، نوعیت اور مقاصد

فصل اول: قرآن حکیم میں آیات استفہام کی ضرورت واہمیت

قرآن مجید فصاحت و بلاغت کےاعتبار سے ایک مثالی کتاب ہے۔علم معانی ہو یا علمِ بیان یا علم بلاغت کے ماہرین نے اس کی لسانی وادبی خصوصیات کو نگارشات کا موضوع بنایا ہے۔ فصاحت و بلا غت کی انہی خوبیوں کی بنا پر قرآن مجید کو کلام مبین بھی کہا گیا ہے۔ قرآن مجید میں جہاں ایجاز و اطناب اور ربط و مساوات کے اسالیب نظر آتے ہیں، وہیں تقدیم و تاخیر اور حذف کے اسلوب بھی نمایاں ہیں۔ قرآن مجید کے مختلف و منفرد اسالیب میں سے ایک اہم اسلوب ِ استفہام ہے۔

استفہام عربی زبان کا لفظ ہے جس کے معنی سوال کرنے، جاننے،فہم حاصل کرنے اور استفسار کرنے کے معنوں میں استعمال ہوتا ہے۔ ادب میں استفہام کسی حقیقت سے مخاطب کو آگاہ کرنے ، مخاطب کو غورو فکر کی دعوت دینا، اور اپنی بات کا ثبات کرنا وغیرہ کے معنوں میں مستعمل ہے۔چنانچہ قرآن مجید میں بھی استفہام کا اسلوب بکثرت استعمال کیا گیا ہے۔

السلم الاجتماعی: ضرورتہ و مبادئہ فی ضوء الشریعۃ الاسلامیۃ

Islam is a religion of peace and harmony. The Islamic teachings are guarantee of peaceful co-existence. A society which practices Islamic teachings of peaceful co-existence, brotherhood and cooperation makes advancement. Disharmony and non-tolerance causes societal decline. The article focuses the importance of peaceful co-existence in light of the Islamic teachings. Besides discussing the principles of societal peace mentioned in the holy Qur’an and Hadith, it has been elaborated that how these principles can be applied to achieve and maintain societal peace and order in contemporary times. The articles ends with some guiding principles and details as suggested in the Qur’an and Sunnah. A Muslim society can prosper only by adopting these principles in letter and spirit and resultantly their differences will be a thing of past. These guiding principles are as under: § Justice and Equality. § Guarantee to rights of all segments of society. § Abiding the rulers in lawful. § Promulgation of Islamic Sharia and observing its objectives. § Adopting moderate and balanced approach in religious matters. § Discharging the duty of preaching in light of Qur’an &Sunnah. § Cooperation in righteous &lawful and avoiding conflict. § Performing citizenry duties in light of Islamic Teachings. § Participating in reformative activities of society.

Rate Optimization and Resource Allocation in Cooperative Cognitive Radio Networks

Rate Optimization and Resource Allocation in Cooperative Cognitive Radio Networks The phenomenal rise in the number of connected devices and the demand for service quality and channel capacity in wireless networks is severely limited by the scarcity of available resources such as energy and bandwidth. New communications and networking paradigms such as cooperative communication and cognitive radio networks have emerged in recent years which can intelligently and efficiently utilize these resources. Cognitive radio enables the cognitive nodes or Secondary Users (SUs) to sense any opportunity for transmission without degrading the Primary Users (PUs) transmission. This helps in efficient utilization of the available radio spectrum. Cooperation among PUs and SUs can greatly enhance the performance of the cognitive radio network. In this thesis, we have considered various spectrum access strategies in Cooperative Cognitive Radio Networks (CCRNs) using distributed matching algorithms in order to optimize the PU and/or SU sum-rate. SUs cooperatively relay PUs messages based on Amplify-and-Forward (AF) and Decode-and-Forward (DF) cooperative techniques, in exchange for accessing some of the spectrum for their secondary communications. From the literatures, we found that the Conventional Distributed Algorithm (CDA) and Pragmatic Distributed Algorithm (PDA) aim to maximize the PU sum-rate resulting in a lower sum-rate for the SU. In this contribution, we have investigated a suit of distributed matching algorithms. More specifically, we investigated SU-based CDA (CDA-SU) and SU-based PDA (PDA-SU) that maximize the SU sum-rate. We have also proposed the All User-based PDA (PDA-ALL), for maximizing the sum-rates of both PU and SU groups. All schemes are investigated under the idealistic scenario involving perfect coding and perfect modulation, as well as under practical scenario involving actual coding and actual modulation. Explicitly, our practical scenario considers the adaptive coded modulation based DF schemes for transmission flexibility and efficiency. More specifically, we have considered the Self-Concatenated Convolutional Code (SECCC), which exhibits low complexity, since it invokes only a single encoder and a single decoder. Furthermore, puncturing has been employed for enhancing the bandwidth efficiency of SECCC. As another enhancement, physical layer security has been applied to our system by introducing a unique Advanced Encryption Standard (AES) based puncturing to our SECCC scheme. Furthermore, we present a secrecy sum-rate maximization based matching algorithm between PUs and SU cooperative jammers in the presence of an eavesdropper. We present the achievable secrecy regions by employing friendly jammers which transmit noise to impair the eavesdropper’s ability to decode the message. The cooperative jammers are allocated a fraction of the bandwidth in compensation for their help to transmit jamming signals towards the eavesdropper, which in our case is an untrusted relay node. We provide results for the secrecy rate regions, where we consider only relaying link between the source and the destination. We also provide results for the secrecy rate regions when we consider a direct link between the source and destination in addition to the relaying link. The Conventional Distributed Algorithm (CDA) and the Pragmatic Distributed Algorithm (PDA), which were originally designed for maximizing the user’s sum rate, are modified and adapted for maximizing the secrecy sum-rate for the primary user. In the end we considered a scenario such that a single PU can acquire help from multiple SUs. More explicitly, we consider an untrusted relay scenario, where the relay is a potential eavesdropper. The transmission of the proposed scheme is divided into three time slots, i.e., broadcast and jamming phase, relaying phase and the jammer’s secondary transmission phase or utility phase. We employ multiple jammers where we first fix the position of two jammers and study the behavior of introducing another moving jammer to maximize the secrecy further. We consider a leader-follower game theoretic model where the primary user (source) is the leader and the secondary users (jammers) are the followers. To facilitate the behavior of cooperative jammers, a Nash equilibrium based power control mechanism is employed. We consider two scenarios for our power control mechanism, where in the first case the jammers simultaneously transmit their information (non-orthogonal) during the jammer’s utility phase, while in the second case the jammer’s utility time slot is divided equally among the participating jammers (orthogonal) to mitigate interference caused by the participating jammers.
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