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Home > Eff Ficient Interco I Onnectio of Ie on Eee802 2. 15. 4 W Wpans Wi Inte Ith Ernet an Extr Nd Raneous Wirel Net S Less Tworks S

Eff Ficient Interco I Onnectio of Ie on Eee802 2. 15. 4 W Wpans Wi Inte Ith Ernet an Extr Nd Raneous Wirel Net S Less Tworks S

Thesis Info

Access Option

External Link

Author

Zafar, Saima

Program

PhD

Institute

University of Engineering and Technology

City

Lahore

Province

Punjab

Country

Pakistan

Thesis Completing Year

2011

Thesis Completion Status

Completed

Subject

Applied Sciences

Language

English

Link

http://prr.hec.gov.pk/jspui/handle/123456789/308

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676725946447

Similar


IEEE802.15.4 Low-Rate Wireless Personal Area Networks (LR-WPANs) are envisioned to play an important role in application centric ubiquitous networks such as Wireless Sensor Networks (WSN). Interconnection of these networks with Internet and with other WPANs in close proximity is essential for effectively organizing, managing and utilizing these networks. Ubiquitous role of WSN can be realized through interconnection with adjacent WSNs as well as with infrastructure networks which can be direct or hopping through bordering WSNs. An example scenario is environmental monitoring of large geographical area where clusters of WSN jointly ensure the ubiquitous presence of WSN. These clusters would require collaboration among themselves in addition to management through infrastructure network. Similarly in critical, mission oriented military applications multiple groups form WSN clusters which require reliable code update in addition to inter-cluster collaboration for information sharing. This thesis addresses challenges in interconnection of LR-WPANs with Internet and with other WPANs in close proximity. In addition to reliable and timely code dissemination to WSN from infrastructure network, there is a need for procedural details to carry out efficient cluster diffusion for inter-PAN communication when multiple PANs operating in distinct logical channels are in close proximity of each other. This work presents two innovative and comprehensive architectures that provide complete solutions for above mentioned research problems while covering all related design elements. A complete architecture for efficient TCP realization in IPv6 based Low-Power Personal Area Network (6LoWPAN) is presented as solution to Internet interconnection research challenge. The 6LoWPAN is a protocol specification that enables communication of Internet Protocol version 6 (IPv6) packets on top of IEEE802.15.4 so that Internet and WSNs can be inter-connected. In commercial and enterprise applications of WSNs reliable and timely multiple/repeated code updates are required from Internet hosts to sensor nodes. For such inbound data traffic which is in general heavy, time-sensitive and loss-intolerant, TCP as transport layer protocol is essential such that end-to-end TCP sessions from Internet node(s) to sensor nodes through a default gateway are set up. In this situation, a single gateway is likely to form the bottleneck of connection due to non-uniform connectivity to sensor nodes and is also susceptible to buffer overflow. The solution to this problem, Session layer-assisted Efficient TCP management architecture (SET) is a management architecture that establishes and manages multiple split- TCP sessions across a number of available gateways. SET performs multiple-TCP-sessions management and executes data striping through shim at session layer. Through analytical modeling and simulations using NS2, it is demonstrated that SET architecture optimizes communication for incoming bulk data transfer, at the same time offering related load balancing services. Multiple split-TCP sessions handled in parallel across a number of gateways results in reducing end-to-end latency for bulk data transfer and prevents absolute communication failure in case of gateway failure. For effective inter-WPAN association, a comprehensive architecture, COmmoN-iNterest basEd diffusion of Collocated PANs via gaTing at border nodes (CONNECT) is proposed that executes diffusion of neighboring PANs. In IEEE802.15.4 networks when multiple PANs are present in Personal Operating Space (POS), they function in non-interfering logical channels. This way, capacity of PAN- directed broadcast is restricted, received-energy per PAN device is reduced and interference at physical layer is minimized. At the down side, under this type of configuration, inter-PAN communication is not possible because PANs in the same region remain unaware of each other’s presence. CONNECT architecture supports communication between multiple PANs in the same POS that might be operating in different logical channels. It enables neighboring PANs to communicate by diffusing into each other through “bordering nodes” called “connect nodes”. The main idea is to time share logical channels such that a gating operation is performed by nodes residing at the border of two non-interfering PANs. CONNECT architecture executes procedures; identification of border nodes by PAN coordinator, discovery of neighboring PAN(s), assigning duty cycle and gating command to border nodes, interest solicit from sensor nodes and data transfer across PANs. CONNECT framework is mathematicall analyzed and NS2 simulations are performed to demonstrate communication aspects at connect nodes to show their usability for diffusion.
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فکروفن

اقبال ایک عظیم مفکر بھی ہیں، شاعر بھی اور فلسفی بھی۔ آپ نے فلسفہ کو با قاعدہ شعر کی
زبان عطا کی۔ اسلوب احمد انصاری فرماتے ہیں:
”اقبال فلسفی بھی ہیں اور شاعر بھی بلکہ کہنا چاہیے فلسفیانہ شاعر۔ ان کے فلسفے
کی افہام و تفہیم ان کی شاعری کے بعض پہلوؤں کو ادراک کی گرفت میں لانے میں
بڑی حد تک ممد معاون ہوتی ہے اور اس پر روشنی ڈالتی ہے “ (31)
اقبال کا فلسفہ اور اقبال کی شاعری تمام ذہنوں پر حکومت کرتا نظر آتا ہے۔ حریف و حلیف اقبال کے شعر و فلسفہ اور فکر کا مقابلہ نہ کر سکے ۔ مخالفین کے نظریات کا غبار خود ہی راستے سے ہٹ گیا۔ اقبال کا سوز و ساز لوگوں کے دلوں میں گھر کر گیا۔ اقبال نے خون جگر سے شاعری کو نور و سرور بخشا۔ یہی ان کا فن ہے۔
اقبال کے فکر و فلسفہ میں فکر وفن کو ایک دوسرے سے جدا نہیں کیا جاسکتا ۔ ویسے تو اقبال شاعری سے انکار کرتے رہے اور پروفیسر آرنلڈ کے زور دینے پر سلسلہ کلام جاری رکھا اور شاعری کے سلسلے کو ہمیشہ اخلاقی اور فکری رکھا۔ اس طرح اقبال نے شاعری کو پیغام پہنچانے کے لیے استعمال کیا اور پیامی شاعر کہلائے۔ اقبال کے نزدیک شاعری کوئی عیش و عشرت کا سامان نہ تھی قوم کو موثر پیغام دینے کا ذریعہ تھی۔ شاعری میں اقبال کا کوئی باقاعدہ استاد تو نہ تھا کچھ دن مرزا داغ سے خط کے ذریعے اصلاح لیتے رہے انہوں نے کچھ دن بعد یہ کہہ دیا کہ اقبال کو اصلاح کی ضرورت نہیں ہے۔
اگر اقبال کی شاعری کا فنی مطالعہ کریں تو کئی جگہ ایسی باتیں نظر سے گزریں گی جن میں اقبال نے شاعری سے بیزاری کا اظہار کیا ہو یہی وجہ ہے کہ انہوں نے...

مولانا حافظ محمد شفیع اوکاڑوی کے تفسیری نکات سماجی بہبود کے تناظر میں

Qruan is the last divine book which revealed on last Prophet Muhammad (PBUH). Every thing regarding to human guidance is mentioned in this book. Prophet Muhammad (PBUH) explained all the aspects of human life according to the Quranic commandments. After Prophet Muhammad (PBUH), his companions and Muslim Scholars (Ulama) of all regions in every era discussed the Quranic commandments in different forms. Their efforts in this regards called "Tafseer" (comments on verses). In this article an attempt will be made to discuss about Moulana Muhammad Shafi Okarvi's Tafseeri points regarding to social welfare. Moulana Okarvi discussed the some core aspects of social welfare according to Quranic guidence just like equality, mutual cooperation and women rights.

Studies on the Removal of Pesticide Residues from Various Vegetables Through Traditional Processing Methods

Pesticides are used in agriculture to safe guard the crops and new vegetation/plantation against pests, diseases, and weeds. Vegetable crops are usually attacked by insect pests round the year from seedling stage up to maturity of the crop because of their attractive colors. The insects, pests cause high damage to the production. It is observed that these pests destroy nearly half of the world''s agricultural crops which not only affects the yield and economy but also leads to lesser economic returns to farmers coupled with decreased supply of food to huge population. It therefore warrants to enhance the yield of crops to feed the ever growing population particularly in developing countries. The study was conducted in two parts. In the first part, the selection of pesticides was carried out through the survey conducted in six districts of lower Sindh to assess the knowledge, perception and use of pesticides amongst farmers. It was observed that farmers were using 27 different types of pesticides belonging to different groups. Out of these, six were most commonly and frequently used. It was further observed that farmers were not applying pesticides in recommended doses, time, frequency, safety interval after last spray and were also not following safety measures during pesticides spray on the crops. Sixty dealers (10 from each district) were allowed to participate in the survey. Questions were asked from the pesticide dealers as per structured questionnaire and it was noticed that 2 dealers of total (3.34%) were postgraduate, 34 (56.66%) were graduate and 15 dealers (25%) had education up to secondary level and 9 dealers (15%) had education up to middle. Majority of the pesticide dealers were not agricultural graduates but these dealers got briefings periodically from pesticide sales representatives of different companies. These sales representatives are competent agriculture graduates with specialization in plant protection, entomology, plant pathology or agronomy. Pesticide companies and other agricultural representatives periodically visited pesticide dealers in different areas explained briefly and provided literature in the form of leaflets and brochures mostly in the local language (Sindhi/Urdu) and/or English of pesticide products. Twenty seven dealers (45%) of them on a quarry replied that they did nothing for the use or reuse of the expired products, whereas 19 dealers (31.67%) returned the pesticides to the respective companies after expiry date, 3 dealers (5%) of them threw them away, whereas 11dealers (18.33%) buried them in the soil. It was also observed that 66.67% farmers demanded the pesticides most frequently in the Kharif season (summer) than in Rabi season (winter) i.e., 33.33% from the pesticide dealers. About 22 dealers explained that there is a high demand of pesticides on cauliflower crop (36.67%) followed by brinjal (25%), tomato (16.67%), bitter gourd (11.66%) and onion (10%). Pesticide dealers further explained that most of the farmers demanded endosulfan (35%) followed by imidaclopride (21.67%), bifenthrin (20%), prefenofos (11.67%), emamectin benzoate (8.33%) and diafenthiuron (3.33%). Five (8.33%) famers brought slips for the pesticide purchase, while 95 (91.67% pesticides were purchased on the recommendation of pesticide dealers. Fifty seven (95%) dealers briefly explained the use of pesticides to the farmer regarding pesticide usage and 34 (56.67%) dealers informed the farmers regarding residual effects of pesticides. The spray of pesticide depended upon many factors such as the price of vegetable in the market, advice from the fellow farmers, pesticide sales representative, etc. 96 (80%) of farmers had their own decision to spray, but 4 (3.33%) farmers have other sources such as Neighbors, Agriculture extension workers, Agriculture Research and Pesticides agents. The time of spray by 49 farmers (40.83%) was in the morning, whereas 71 farmers (59.17%) sprayed in the evening. Only 5 farmers (4.17%) used the protective cloths in winter but in summer they did not use because of high temperature and high moisture and 115 farmers (95.83%) farmers did not use the protective clothes & tools in lower Sindh. They put off shoes deliberately while spraying. For increasing the effect of pesticides, farmers also used the mixed pesticides as suggested to them by different sources such as Agriculture extension department, Pesticides dealer or by their own decision. About 118 (98.33%) farmers had used the mixed pesticides on their crop in which 92 farmers (76.67%) farmers’ source was pesticides dealer. Answers about interval between pesticide application and harvest depended on farmer’s need of vegetables not on the kind of the pesticides. In the second part, in order to reduce the risk of vegetables poisoning due to residues, the study was conducted on farmer’s field to reduce the pesticide residues from vegetables through various traditional processing being practiced at various homes of Sindh province of Pakistan. Five vegetables i.e. onion, cauliflower, bitter gourd, brinjal and tomato were grown on farmers field and were sprayed with different insecticides/pesticides at recommended dosages. Onion was harvested one week after the application of pesticides, while cauliflower, bitter gourd, tomato and brinjal were harvested one day after the spray of pesticides. After harvesting, the samples were packed in polythene bags, labeled and brought to the laboratory of Institute of Food Sciences and Technology for traditional processing such as plain water washing, detergent washing, blanching, salt washing, drying under sun and in cabinet dehydrator and boiling/frying etc. The samples were further processed for extraction, clean up and analyses. The results revealed that some traditional processing methods were mildly effective and others were highly effective. Plain water washing reduced the residues up to 45% whereas, detergent water washing deceased it up to 50%. The blanching treatment of vegetable further removed the pesticide residues up to 60%. The washing was followed by sun drying, drying in cabinet and dehydrator and/or frying which reduced the pesticide residues by more than 80% from all the five vegetables and were found highly effective. The results further suggest that every traditional method played its significant role in reducing the residues depending upon the kind of vegetables and the type and nature of pesticides. Commercially produced samples of all the vegetables taken from Hyderabad market were found contaminated with residues of more than one pesticide and most of the samples contained residues above their respective MRLs. It is therefore, concluded from the study that traditional/house hold processing methods play a significant role in reducing the insecticides/pesticides. However, indiscriminate use of pesticides and lack of good agricultural practices lead to residue problems in vegetables and the consumption of pesticide residue contaminated vegetables may cause severe health haz