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Search Results: 1 - 10 of 601671 matches for " A.R. Arunachalam "
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An Evaluation of Location Privacy in Wireless Sensor Networks
R. SUGANYA SUBATHRA,A.R. ARUNACHALAM
International Journal of Computer Science and Mobile Computing , 2013,
Abstract: Due to the open nature of a sensor network, it is relatively easy for an adversary to eavesdrop andtrace packet movement in the network in order to capture the receiver physically. After studying theadversary’s behavior patterns, we present countermeasures to this problem. We propose a location-privacyrouting protocol (LPR) that is easy to implement and provides path diversity. Combining with fake packetinjection, LPR is able to minimize the traffic direction information that an adversary can retrieve fromeavesdropping. By making the directions of both incoming and outgoing traffic at a sensor node uniformlydistributed, the new defense system makes it very hard for an adversary to perform analysis on locallygathered information and infer the direction to which the receiver locates. We evaluate our defense systembased on three criteria: delivery time, privacy protection strength, and energy cost. The simulation resultsshow that LPR with fake packet injection is capable of providing strong protection for the receiver’s locationprivacy. Under similar energy cost, the safe time of the receiver provided by LPR is much longer than othermethods, including Phantom routing [1] and DEFP [2]. The performance of our system can be tunedthrough a couple of parameters that determine the tradeoff between energy cost and the strength of locationprivacyprotection.
A Novel Approach of Energy Optimization in WSN
S. Geetha Priya,A.R. Arunachalam
International Journal of Computer Science and Mobile Computing , 2013,
Abstract: The wireless link can be unreliable in realistic wireless sensor networks (WSNs). Energy efficientand reliable data forwarding is important because each node has limited resources. Therefore, we mustsuggest an optimal solution that considers using the information of the node’s characteristic A wirelesssensor network is composed of a large number of low-cost devices distributed over a geographic area. Sensornodes have limited processing capabilities therefore simplified protocol architecture should be designed so asto make communications simple and efficient. Moreover, the power supply unit is based on an energy-limitedbattery the networks should be aimed at minimizing the energy consumption. A forwarding scheme for WSNaimed at combining low computational complexity and high performance in terms of energy efficiency andreliability. The approach relies on a packet-splitting algorithm based on the BURST algorithm. Theperformance of burst is to be obtained by Shortest Path with Load Balancing (SP).The energy efficiency islow in this splitting process compare to those shortest paths. To estimation of the mean energy reductionfactor achievable with the forwarding scheme should be derived and the reassembling is done in destinationside, the values to be coded in code block and simulated using MATLAB simulator. The proposed algorithmoutperforms in terms of energy saving and increases the network lifetime.
Post-Aneurysmal Subarachnoid Hemorrhage Vasospasm, Clinical Correlation between the Aneurysm Site and Clinical Vasospasm  [PDF]
Ahmed Ali, Mohamed A.R. Soliman
Open Journal of Modern Neurosurgery (OJMN) , 2018, DOI: 10.4236/ojmn.2018.83025
Abstract: Background: Intracranial vasospasm is a common complication following subarachnoid hemorrhage (SAH). The radiographic vasospasm can reach up to 90% of aneurysmal SAH. Materials and Methods: 139 consecutive patients admitted to Cairo University Hospitals from June 2013 to September 2014 with SAH who had been enrolled in a retrospective controlled study were analyzed retrospectively for the occurrence of vasospasm. The data collected from the charts of Cairo University Hospitals were the patient’s demographics, clinical presentation, aneurysm location, treatment modality, and Glasgow Outcome Scale (GOS) scores. We excluded 24 patients with nonaneurysmal SAH, 3 internal carotid artery (ICA) aneurysms, 7 with multiple aneurysms and 4 patients died before treatment. Results: 72 males and 29 females were included in the study, mean age 53.5 ± 11.5 years. Twelve patients had aneurysms located in the vertebral artery group, 24 had middle cerebral artery aneurysms, 11 had pericallosal aneurysms, and 54 patients had anterior communicating artery (ACoA) complex aneurysms. Radiographic vasospasm occurred in 62.4% with the highest incidence (75.9%) at the ACoA complex group. Symptomatic vasospasm occurred in 48.5% with the highest incidence (63%) at the anterior communicating artery complex aneurysm location. The mean GOS at 6 months follow-up was 4.2. The worse GOS was found in the vertebral artery (VA) aneurysm group with a mean of 3.75. Conclusion: Aneurysms of the anterior communicating artery complex group have a greater risk of both radiographic and clinical vasospasm. Also, the worse 6 months follow-up GOS when an aneurysm was located in the VA group.
The linear ordering problem: an algorithm for the optimal solution
A.R Mushi
African Journal of Science and Technology , 2005,
Abstract: In this paper we describe and implement an algorithm for the exact solution of the Linear Ordering problem. Linear Ordering is the problem of finding a linear order of the nodes of a graph such that the sum of the weights which are consistent with this order is as large as possible. It is an NP - Hard combinatorial optimisation problem with a large number of applications, including triangulation of input - output matrices in Economics, aggregation of individual preferences and ordering of teams in sports. We implement an algorithm for the exact solution using cutting plane and branch and bound procedures. The program developed is then applied to the triangulation problem for the input - output tables. We have been able to triangulate input - output matrices of size up to 41 x 41.
Tabu search heuristic for university course timetabling problem
A.R Mushi
African Journal of Science and Technology , 2006,
Abstract: In this study we have addressed the NP-Hard problem of academic course timetabling. This is the problem of assigning resources such as lecturers, rooms and courses to a fixed time period normally a week, while satisfying a number of problem-specific constraints. This paper describes a Tabu Search algorithm that creates timetables by heuristically minimizing penalties over infeasibilities. The algorithm is developed with special focus on the University of Dar-assalaam and compares the results with a previous manually generated timetable. It has been found that, the Tabu Search technique gives better results given a careful selection of parameters.
Resource Use Efficiency in Yam Production in Ondo State, Nigeria
Fasasi A.R.
Agricultural Journal , 2013,
Abstract: This study delve through the resource-use efficiency in yam production among randomly selected sample of 150 yam producers in 5(out of 18) purposively selected Local Government Areas (L.G.As) in Ondo State, Nigeria. The production function analysis revealed inefficiency in the use of land, hired labour, family labour and investment on seed yam. The Marginal Value of Products (M.V.Ps) for inputs used in production were N97, 804 per hectare, N3, 349 for hired labour, N122: 50 for family labour and N156:10 for seed yam (for additional unit of input).Also the M.V.P of the inputs were higher than the corresponding Marginal Factor Costs (M.F.Cs), signifying input under-utilization. In this connection, an increase in allocation of land, hired labour, family labour and investment on seed yam will surely raise the output of yam. Also there is need for improved dissemination of information on Miniset-technique of raising seed yam.
A Review on Post-Puberty Hypothyroidism: A Glance at Myxedema
A.R. Mansourian
Pakistan Journal of Biological Sciences , 2010,
Abstract: Hypothyroidism, is a thyroid disorder accompanied by serum thyroid hormone reduction when thyroxin T4, the main thyroid hormone, reduced, it is followed by disruption of a negative-feed back auto regulatory mechanism on pituitary gland and subsequent thyroid stimulating hormone (TSH) which is released into the blood circulation to stimulate the thyroid gland to produce enough thyroid hormone to compensate for the body hormone requirements. Therefore, reduced serum thyroxin(T4) in principle, triidothyronine (T3) and elevated TSH are laboratory indices for the diagnosis of hypothyroidism. At early stage of hypothyroidism although laboratory measurements of thyroid function test are manifest the thyroid disorder but the patient clinical signs and symptoms may remain unnoticed. If the patient undiagnosed and untreated the condition of hypothyroidism worsen and the clinical manifestation begin to show itself and myxedema is a definition given to the whole picture of untreated hypothyroidism at very end stage the patients enter into myxedema comma with eventual death due to the sever symptoms of hypothyroidism. Among important causative factors leading to catastrophic events in myxedema is life threatening hypothermia, heart and cerebral dysfunctions.
Metabolic Pathways of Tetraidothyronine and Triidothyronine Production by Thyroid Gland: A Review of Articles
A.R. Mansourian
Pakistan Journal of Biological Sciences , 2011,
Abstract: Tetraidothyronine (T4) and Triiodothyronine (T3) are the two vital hormones in human metabolism produced by thyroid gland. The major pathways in thyroid hormone biosynthesis begin with iodine metabolism which occurs in three sequential steps: active iodide transport into thyroid followed by iodide oxidation and subsequent iodination of tyrosyl residues of thyroglobulin (Tg) to produce idotyrosines monoidotyrosine (MIT) and diiodothyrosine (DIT) on Tg. Oxidized iodine and tyrosyle residues which are an aromatic amino acids are integral part of T4 and T3. The thyroid iodine deficiency of either dietary, thyroid malfunction , or disorder of hypothalamus and pituitary to produce enough Thyroid Stimulating Hormone (TSH), eventually lead to hypothyroidism with sever side effects. Iodine oxidation is the initial step for thyroid hormone synthesis within thyroid, is mediated by thyroperoxidase enzyme (TPO), which itself is activated by TSH required for production of MIT and DIT. T4 and T3 are subsequently are synthesized on Tg following MIT and DIT coupling reaction. Thyroid hormones eventually produced and released into circulation through Tg pinocytosis from follicular space and subsequent lysozomal function, a process again stimulated by TSH. The production of T4 and T3 are highly regulated externally by a negative feed-back interrelation between serum T4, T3 and TSH and internally by the elevated iodine within thyroid gland. It is believed the extra iodine concentration within thyroid gland control thyroid hormones synthesis by inhibition of the TPO and hydrogen peroxide (H2O2) formation which is also an essential factor of iodine oxidation, via a complex mechanism. In healthy subjects the entire procedures of T4 and T3 synthesis re-start again following a drop in serum T4 and T3 concentration. On conditions of thyroid disorders, which caused by the distruption of either of above mechanisms, thyroid hormone deficiency and related clinical manifestations eventually begin to show themselves.
The Declining Clans
A.R. Magno
Kasarinlan : Philippine Journal of Third World Studies , 1988,
Abstract:
New types of tourism in a medium-sized historic city: present state and ternds
Lebedev A.R.
Sovremennaa Ekonomika : Problemy, Tendencii, Perspektivy , 2011,
Abstract: In the article, the development of Murom’s tourism industry as a whole, and different types of tourism in particular, is analysed. Besides, modern approaches to tourism classification are examined, the author’s concept is offered, and some types of tourism (existing ones in the middle-sized historic city under investigation and new ones for it) are defined by the author.
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