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Search Results: 1 - 10 of 58 matches for " Sairam Vakkalanka "
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Requirements Triage - Challenges and Solutions [
Sairam Vakkalanka,Ranjith Engu
International Journal of Software Engineering & Applications , 2012,
Abstract: This paper presents a discussion on the process of requirements triage in market driven requirements engineering and also reports the challenges, consequences, solutions and the experiences with the proposed solutions. Analyses of the observed results are also presented by the authors before conclusion.
Mitigation strategies to Major challenges Faced in Market Driven Development Scenario
Ranjith Engu,Sairam Vakkalanka
International Journal of Software Engineering & Applications , 2012,
Abstract: This report explains about three major challenges that are faced in market driven requirement engineeringwith feasible solutions. Also, discusses the circumstances and implications organizations face due to thesechallenges. Validation and analysis of the solutions is provided with our own experiences from industryand literature study, discussing the merits and demerits.
Bespoke, Mdre And Challenges In Mdre In Comparison With Bespoke
Ranjith Engu,Sairam Vakkalanka,Loka. Ashwin Kumar
Journal of Emerging Trends in Computing and Information Sciences , 2012,
Abstract: This paper gives an idea on the basic concepts of requirements Engineering (RE) and the differences between the Bespoke Requirements Engineering and market driven Requirements Engineering, It also describes the challenges associated with Market Driven RE in comparison to the Bespoke RE.
The Influence of Radial Area Variation on Wind Turbines to the Axial Induction Factor  [PDF]
Kedharnath Sairam, Mark G. Turner
Energy and Power Engineering (EPE) , 2014, DOI: 10.4236/epe.2014.611034
Abstract: Improvements in the aerodynamic design will lead to more efficiency of wind turbines and higher power production. In the present study, a 3D parametric gas turbine blade geometry building code, 3DBGB, has been modified in order to include wind turbine design capabilities. This approach enables greater flexibility of the design along with the ability to design more complex geometries with relative ease. The NREL NASA Phase VI wind turbine was considered as a test case for validation and as a baseline by which modified designs could be compared. The design parameters were translated into 3DBGB input to create a 3D model of the wind turbine which can also be imported into any CAD program. Design modifications included replacing the airfoil section and modifying the thickness to chord ratio as a function of span. These models were imported into a high-fidelity CFD package, Fine/TURBO by NUMECA. Fine/TURBO is a specialized CFD platform for turbo-machinery analysis. A code-geomturbo was used to convert the 3D model of the wind turbine into the native format used to define geometries in the Fine/TURBO meshing tool, AutoGrid. The CFD results were post processed using a 3D force analysis code. The radial force variations were found to play a measurable role in the performance of wind turbine blades. The radial component of the blade surface area as it varies in span is the dominant contributor of the radial forces. Through the radial momentum equation, this radial force variation is responsible for creating the streamline curvature that leads to the expansion of the streamtube (slipstream) that is responsible for slowing the wind velocity ahead of the wind turbine leading edge, which is quantified as the axial induction factor. These same radial forces also play a role in changing the slipstream for propellers. Through the design modifications, simulated with CFD and post-processed appropriately, this connection with the radial component of area to the radial forces to the axial induction factor, and finally the wind turbine power is demonstrated. The results from the CFD analysis and 3D force analysis are presented. For the case presented, the power increases by 5.6% due to changes in airfoil thickness only.
Case Study : Evaluation Smoke & Evacuation Performance of a College Auditorium
Ramisetti Sairam
International Journal on Theoretical and Applied Research in Mechanical Engineering , 2012,
Abstract: From Uphaar Fire Tragedy to recent Mumbai Secretariat Fire accident shows how Vulnerable are Old Constructions, while new one are well designed with Necessary Fire Protection Systems. It is well known fact many of Old Structures in India doesn’t have basic Fire Protection systems such as F.E. This paper is intended to study one of such old Constructions, a college Auditorium and evaluate risk on loss of Life due to Suffocation and Thermal Injuries using Simulation. The understanding of smoke and Behavior aspects of Man at the time of Fire helps to Design efficient Smoke Management systems.
Neutropenia and Neutropenic Complications in ABVD Chemotherapy for Hodgkin Lymphoma
Bhanu Vakkalanka,Brian K. Link
Advances in Hematology , 2011, DOI: 10.1155/2011/656013
Abstract: A combination of Adriamycin (a.k.a. Doxorubicin), Bleomycin, Vinblastine, and Dacarbazine (ABVD) is the most commonly used chemotherapy regime for Hodgkin lymphoma. This highly effective treatment is associated with a significant risk of neutropenia. Various strategies are adopted to counter this commonly encountered problem, including dose modification, use of colony stimulating factors, and prophylactic or therapeutic use of antibiotics. Data to support these approaches is somewhat controversial, and in keeping with the paucity of definitive evidence, there is a wide disparity in the management of neutropenia in patients receiving ABVD chemotherapy. This paper summarizes the evidence for managing ABVD-related neutropenia during the treatment of Hodgkin lymphoma. 1. Introduction Hodgkin Lymphoma (HL) accounts for 10–15% of all lymphomas in the western countries. It typically shows a bimodal age distribution and accounts for 15% of all cancers in the population aged 15–24 years [1]. The incidence of HL, based on data from the United States and European registries ranges from 2.3 to 3.2 per 100,000 men and 1.3 to 2.5 per 100,000 women. The estimated 5-year survival of all HL patients is about 86%, but the survival drops to 53% in patients older than 65 years of age (SEER database) [2]. HL is classified into classical HL and lymphocyte predominant type, based on differences in morphology, genotype, phenotype, and clinical behavior. Classical HL is again subdivided into four distinct histological types: nodular sclerosis, mixed cellularity, lymphocyte predominant and lymphocyte depleted [3]. Patients present at various clinical stages with or without B symptoms, as defined by the Cotswold staging system [4]. 2. Advanced Hodgkin Treatment Overview Combined chemotherapy and radiation is the most effective treatment approach for early stage (I-II) HL. Chemotherapy with involved field radiation therapy (IFRT) is shown to be superior to radiation therapy alone in a large EORTC clinical trial [5]. A metaanalysis of twenty-three clinical trials suggests that use of this combined modality treatment results in better tumor control and overall survival compared to chemotherapy alone [6]. Most trials have shown that two to four cycles of chemotherapy with IFRT is adequate treatment for early stage HL [5, 7, 8]. Advanced HL (defined as presentation with tumor bulk > 10?cm, the presence of B symptoms, and/or stage III/IV disease) is associated with a 30–40% failure rate following anthracycline-based chemotherapy [9]. Six to eight cycles of chemotherapy are considered
Pedestrian and Object Detection Using a Spatial Filter in the Dark Environment
P. Selvarani,Sairam Natarajan
Research Journal of Applied Sciences, Engineering and Technology , 2013,
Abstract: This study dedicates a new approach for detecting the pedestrians and the objects in the dark environment using a spatial filter. Detecting an actual position of an object and a person in the dark region is an atomic challenge for many researchers. To detect the objects and the persons, a spatial filter is utilized. The basic idea of the spatial filter is adapted by varying its radii of the dark region. Based on the radii’s variation, the persons and the objects are detected. Finally, the actual position of detecting objects and persons are segmented using object compensation. Extensive experiments have been carried out on an object equipped with an infrared/digital camera and preliminarily tested in different situations. This proposed method is achieved 90.7% accuracy in detecting an actual position of the human and the object in the dark area.
Face recognition using a Coarse-to-Fine Level Set Scheme
P. Selvarani,Sairam Natarajan
Research Journal of Applied Sciences, Engineering and Technology , 2013,
Abstract: This study inscribes a new approach for determining face-recognition system’s accuracy using a novel coarse-to-fine level set scheme. Recognizing a face in a facial database by using segmentation is a trivial challenge for many researchers. To distinguish facial photographic images from a background, the discrete wavelet transform is utilized to extract facial images. Novel energy function model is used for solving a contour extraction problem. In order to segment images, coarse-to-fine level set scheme is implemented. Finally face recognition process is done by face detection through the segmented images and matches the face with their same photograph, which is avail in the database. Extensive experiments have been carried out on capturing a facial photograph dynamically to validate the proposed method.
Multiple Testing under Dependence with Approximate Conditional Likelihood
Sairam Rayaprolu,Zhiyi Chi
Statistics , 2014,
Abstract: It has long been recognized that statistical dependence in data poses a significant challenge to large-scale multiple testing. Failure to take the dependence into account can result in severe drop in performance of multiple testing. In particular, the detection power of large-scale multiple tests is known to suffer when the False Discovery Proportion must be controlled. However, it often happens that the dependence structure is unknown and only a single, albeit very high dimensional, observation of test statistic is available. This makes large scale multiple testing under dependence considerably harder. Our work addresses this problem for the case of a stationary, ergodic signal vector with low signal-strength and known noise distribution. Our main contribution in this setting is a new approach for improved recovery of a long sequence of dependent binary signals embedded in noisy observations. The novel aspect of our approach is the approximation and numerical computation of the posterior probabilities of binary signals at individual sites of the process, by drawing strength from observations at nearby sites without assuming the availability of their joint prior distribution. Although we only consider signal vectors registered as a time series, the approach in principle may apply to random fields as well.
Broadband Corrugated Square-Shaped Monopole Antenna
S. D. Ahirwar,C. Sairam
ISRN Communications and Networking , 2011, DOI: 10.5402/2011/248931
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