Informatics Publishing Limited

C. Raghunathan ¹, C. Sivaperuman ¹, Ch. Satyanarayana ², P. T. Rajan ¹

Affiliations
1 Zoological Survey of India, Andaman and Nicobar Regional Station, Port Blair-744 102, Andaman & Nicobar Islands, IN
2 Zoological Survey of India, 2nd Floor, Fireproof Spirit Building, IndianMuseum Complex, 27, JawaharlalNehru Road, Kolkata-700 016,W. B., IN

Abstract

The density and diversity of corals and their associated faunal communities were investigated by underwater survey in Katchal and Teressa Islands of Andaman and Nicobar Archipelago in order to assess the post-tsunami status of corals. The density of scleractinian corals in Katchal Island is 1-13 colonies/10m², and in Teressa Island it ranged from1 to 18 colonies/10m². Fifteen species of scleractinian corals belonging to 13 genera and 6 families with the species diversity of 0.98 were identified during the survey in Katchal Island. Whereas in Teressa Islands 25 species of corals under 14 genera and 7 families with the species diversity of 1.17 have been reported. The density and diversity of coral associated faunal communities such as zooplankton, octocorals, sponges, molluscs and echinoderms were also studied at both the islands.

Keywords

Corals, Post-Tsunami, Katchal & Teressa Islands, Coral Associated Fauna.

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Ch. Satyanarayana ¹, S. Ramakrishna Rao ², Kaizar Hossain ³

Affiliations
1 Deptt. of Marine Engg., College of Engineering, Andhra University, Visakhapatnam-530 003, A.P., IN
2 Deptt. of Civil Engg., College of Engineering, Andhra University, Visakhapatnam-530 003, A.P., IN
3 Dept. of Environmental Studies, GITAM Institution of Science, GITAM University, Visakhapatnam-530 045, A.P., IN

Abstract

Assessment of water quality is important as water is used for domestic, agricultural and also industrial purposes. The coastal stretch of Andhra Pradesh abutting Bay of Bengal is also a part of the Coromandal coast that runs to a length of 960 km on the east coast of India. The two large rivers Godavari and Krishna, which originate in the west coast, join the sea with in a gap of 200 km between them. The rivers, in addition to suspended sediments coming through surface runoff, also receive discharge of domestic as well as treated and untreated industrial effluents. The water samples of various freshwater bodies from 80 different stations in the nine districts were collected and analysed for their physicochemical characteristics to determine the hydrogeochemical characteristics of the stretch of Andhra Pradesh.

Keywords

Freshwater Resources, Andhra Pradesh Coast, Water Quality, Water Pollution.

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S. K. Satyanarayana ¹, Ch. Satyanarayana ¹, V. S. G. N. Raju ¹

Affiliations
1 Dept. of ECE, SNIST, Hyderabad, IN

Abstract

Wireless multimedia networks are becoming increasingly popular as they provide users the convenience of access to information and services anytime, anywhere and in any format. The upcoming wireless cellular infrastructures such as third generation (3G) and fourth generation (4G) are deemed to support new high-speed services with different Quality-of-Service (QOS) and their respective traffic profiles. Different wireless multimedia services have diverse bandwidth and QOS requirements, which need to be guaranteed by the wireless cellular networks. The call admission control algorithm deals with multiple classes of calls having different requirements, requesting different Quality of Service (QOS) and with different priorities for admission into the network. In this paper we present a Adaptive Call admission Control algorithm for the next generation of wireless cellular networks at the connection level, where the bandwidth allocated to the ongoing calls can be dynamically adjusted by Bandwidth up gradation and degradation algorithms. This framework supports establishing a priority mechanism for handoff calls over new calls and also establishing a priority mechanism for different types of traffic classes (CBR, VBR, UBR). The performance of proposed adaptive CAC algorithm is evaluated based on the New Call Blocking Probability, Hand off Call Dropping rate with the existing CAC algorithm for wireless multimedia networks. By simulation results it is shown that our proposed algorithm achieves less New Call Blocking Probability, Hand off Call Dropping rate for different traffic classes.

Keywords

CBR, VBR, UBR, QOS, 3G.

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P. Nageswara Reddy ¹, C. P. V. N. J. Mohan Rao ², Ch. Satyanarayana ¹

Affiliations
1 Jawaharlal Nehru Technological University, College of Engineering, IN
2 Department of Computer Science and Engineering, Avanthi Institute of Engineering and Technology, IN

Abstract

Multiresolution analysis is often used for image representation and processing because it can represent image at the split resolution and scale space. In this paper, a novel medical image segmentation algorithm is proposed that combines contourlet transform and modified active contour model. This method has a new energy formulation by representing the image with the coefficients of a contourlet transform. This results fast and accurate convergence of the contour towards the object boundary. Medical image segmentation using contourlet transforms has shown significant improvement towards the weak and blurred edges of the Magnetic Resonance Image (MRI). Also, the computational complexity is less compared to using traditional level sets and variational level sets for medical image segmentation. The special property of the contourlet transform is that, the directional information is preserved in each sub-band and is captured by computing its energy. This energy is capable of enhancing weak and complex boundaries in details. Performance of medical image segmentation algorithm using contourlet transform is compared with other deformable models in terms of various performance measures.

Keywords

Multiresolution, Contourlet Transform, MRI, Active Contours, Segmentation.

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Chandra Mouli Venkata Srinivas Akana ¹, K. Sundeep Kumar ², C. Divakar ³, Ch. Satyanarayana ⁴

Affiliations
1 Department of CSE, AMC Engineering College, Bangalore-83, IN
2 Department of CSE, CMR Institute of Technology, Bangalore, IN
3 Visakha Institute of Technology, Visakhapatnam, AP, IN
4 Department of CSE, JNTUK, Kakinada, AP, IN

Abstract

In computing clouds, it is desirable to avoid wasting resources as a result of under-utilization and to avoid lengthy response times as a result of over-utilization. In this technical report, we investigate a new approach for dynamic autonomous resource management in computing clouds. The main contribution of this work is two-fold. First, we adopt a distributed architecture where resource management has decomposed into independent tasks, each of which is performed by Autonomous Node Agents that are tightly coupled with the physical machines in a data center. Second, the Autonomous Node Agents carry out configurations in parallel through Multiple Criteria Decision Analysis using the PROMETHEE method. Simulation results show that the proposed approach is promising in terms of scalability, feasibility and flexibility.

Keywords

Cloud Computing, Distributed Architecture, Grid Computing, PROMETHEE Method, Utility Computing.

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