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Search Results: 1 - 10 of 90 matches for " Sabit Ekin "
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Performance Analysis of Ad Hoc Dispersed Spectrum Cognitive Radio Networks over Fading Channels
Khalid A. Qaraqe,Hasari Celebi,Muneer Mohammad,Sabit Ekin
EURASIP Journal on Wireless Communications and Networking , 2011, DOI: 10.1155/2011/849105
Abstract:
Performance Analysis of Ad Hoc Dispersed Spectrum Cognitive Radio Networks over Fading Channels
Qaraqe KhalidA,Celebi Hasari,Mohammad Muneer,Ekin Sabit
EURASIP Journal on Wireless Communications and Networking , 2011,
Abstract: Cognitive radio systems can utilize dispersed spectrum, and thus such approach is known as dispersed spectrum cognitive radio systems. In this paper, we first provide the performance analysis of such systems over fading channels. We derive the average symbol error probability of dispersed spectrum cognitive radio systems for two cases, where the channel for each frequency diversity band experiences independent and dependent Nakagami- fading. In addition, the derivation is extended to include the effects of modulation type and order by considering M-ary phase-shift keying ( -PSK) and M-ary quadrature amplitude modulation -QAM) schemes. We then consider the deployment of such cognitive radio systems in an ad hoc fashion. We consider an ad hoc dispersed spectrum cognitive radio network, where the nodes are assumed to be distributed in three dimension (3D). We derive the effective transport capacity considering a cubic grid distribution. Numerical results are presented to verify the theoretical analysis and show the performance of such networks.
Random Subcarrier Allocation in OFDM-Based Cognitive Radio Networks
Sabit Ekin,Mohamed M. Abdallah,Khalid A. Qaraqe,Erchin Serpedin
Mathematics , 2012, DOI: 10.1109/TSP.2012.2203126
Abstract: This paper investigates the performance of an orthogonal frequency-division multiplexing (OFDM)-based cognitive radio (CR) spectrum sharing communication system that assumes random allocation and absence of the primary user's (PU) channel occupation information, i.e., no spectrum sensing is employed to acquire information about the availability of unused subcarriers. In case of a single secondary user (SU) in the secondary network, due to the lack of information of PUs' activities, the SU randomly allocates the subcarriers of the primary network and collide with the PUs' subcarriers with a certain probability. To maintain the quality of service (QoS) requirement of PUs, the interference that SU causes onto PUs is controlled by adjusting SU's transmit power below a predefined threshold, referred to as interference temperature. In this work, the average capacity of SU with subcarrier collisions is employed as performance measure to investigate the proposed random allocation scheme for both general and Rayleigh channel fading models. Bounds and scaling laws of average capacity with respect to the number of SU's, PUs' and available subcarriers are derived. In addition, in the presence of multiple SUs, the multiuser diversity gain of SUs assuming an opportunistic scheduling is also investigated. To avoid the interference at the SUs that might be caused by the random allocation scheme and obtain the maximum sum rate for SUs based on the available subcarriers, an efficient centralized sequential algorithm based on the opportunistic scheduling and random allocation (utilization) methods is proposed to ensure the orthogonality of assigned subcarriers.
Performance of phosphate solubilizing bacteria for improving growth and yield of sunflower (Helianthus annuusL.) in the presence of phosphorus fertilizer
Z Ekin
African Journal of Biotechnology , 2010,
Abstract: The ability of phosphate solubilizing bacteria (PSB) to convert insoluble forms of phosphorus to an accessible form is an important trait in sustainable farming for increasing plant yields. The beneficial effects of PSB on crop productivity have been widely described, but the use of PSB as biofertilizer is scarcely documented in sunflower. The objective of this study was to evaluate the effect of application of PSB, Bacillus M-13, with and without varying amounts of phosphorus (P) fertilizer on growth and yield of sunflower under field conditions. The PSB application was able to mobilize P efficiently in the sunflower and improved seed quality and oil yield. It also enhanced the head diameter, 1000 seed weight, kernel ratio and oil content and led to seed and oil yield increases of 15.0 and 24.7% over no application, respectively. However, when PSB was used in conjunction with P fertilizers, a much greater effect was observed. It was found that the highest seed yield of sunflower possible with 100 kg P2O5 ha-1 fertilizer was achieved with about 50 kg P2O5 ha-1 when used in conjunction with PSB. But the important effect of PSB on oil yield was noted at 100 kg P2O5 ha-1, possibly indicating increased PSB activity in the rhizosphere following PSB application and consequently by enhanced P solubilization as evidenced by the higher levels of P content of seed.
Treatment of Subepidermal Autoimmune Bullous Diseases
Ekin ?avk
Turkderm , 2011,
Abstract: The common therapeutic goal for all subepidermal bullous diseases is to prevent inflammation and production of pathogenic autoantibodies and/or to facilitate the elimination of these antibodies. Diseases included in this group are the pemphigoids, linear IgA dermatosis, epidermolysis bullosa acquisita, dermatitis herpetiformis and bullous systemic erythematosus. Corticosteroids are the most commonly used systemic medication. Other alternatives include dapsone, various antibiotics and nicotinamide, azathioprine, cyclophosphamide, methotrexate, cycloporine, mycophenolate mofetil, IV immunoglobulins and plasmapheresis. Rapid reepithelialization and prevention of secondary infections are provided by local hygenic measures including antiseptic baths and wound care.
Immunology of Photo(chemo)therapy
Ekin ?avk
Turkderm , 2010,
Abstract: Perhaps the oldest empirical therapeutic modality in the history of medicine, photo(chemo)therapy has well documented benefits but its mode of action is not fully elucidated. Today, thanks to advances in photoimmunology and molecular biology we are provided with important clues as to how photo(chemo)therapy works. Initial research on UV light and skin cancer has brought about the groundbreaking discovery of the immunological effects UV. UVB is the UV light most frequently used for therapeutic purposes and its mechanisms of action are best demonstrated. UV light has several distinct effects on various components of the innate and acquired immune systems, especially T lymphocyte functions the common endpoint of which is immune supression. The antiproliferative and antifibrotic therapeutic effects of UVA and UVB have so far not been directly associated with immunological mechanisms.
Treatment of Subepidermal Autoimmune Bullous Diseases Sürekli E itim
Ekin ?avk
Turkderm , 2011,
Abstract: The common therapeutic goal for all subepidermal bullous diseases is to prevent inflammation and production of pathogenic autoantibodies and/or to facilitate the elimination of these antibodies. Diseases included in this group are the pemphigoids, linear IgA dermatosis, epidermolysis bullosa acquisita, dermatitis herpetiformis and bullous systemic erythematosus. Corticosteroids are the most commonly used systemic medication. Other alternatives include dapsone, various antibiotics and nicotinamide, azathioprine, cyclophosphamide, methotrexate, cycloporine, mycophenolate mofetil, IV immunoglobulins and plasmapheresis. Rapid reepithelialization and prevention of secondary infections are provided by local hygenic measures including antiseptic baths and wound care. (Turkderm 2011; 45 Suppl 1: 54-8)
Thoughts on a Letter “S”
Ekin ?avk
Turkderm , 2011,
Abstract: ...
From the Depths of Dermatology
Ekin ?avk
Turkderm , 2012,
Abstract: ...
Resurgence of Safflower (Carthamus tinctorius L.) Utilization: A Global View
Zehra Ekin
Journal of Agronomy , 2005,
Abstract: The growing demand for vegetable fats as food purposes has entailed a considerable expansion of oilseed crops all over the world. Although safflower ranks last in oilseed crops, it includes some valuable characteristics that have made the species famous throughout the centuries, in particular as a multi-purpose oilseed, medicinal plant and a source of carthamin, a dye. For human nutrition, safflower oil has a nutritional value that similar to olive oil; moreover, the high oleic type is very suitable for hypo-cholesterol diets, for frying and in the preparation of frozen food. The high linoleic type may also used for industrial purposes such as preparation of varnishes, the production of biodiesel and alcohols to use in producing surfactants. Safflower is also a source of important chemicals like a-tocopherol and carthamin. In this review, after illustrating the uses of safflower as a oil and medicinal plant and the major characteristics of the oil, seed and flower, a brief analysis of world-wide current situation and future prospects of safflower utilization are presented.
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