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A Cross - Domain Role Mapping and Authorization Framework for RBAC in Grid Systems.
G. Geethakumari,,Atul Negi,,V. N. Sastry
International Journal of Computer Science & Applications , 2009,
An ECC-Based Two-Party Authenticated Key Agreement Protocol for Mobile Ad Hoc Networks
Kavitha Ammayappan,Atul Negi,V. N. Sastry,Ashok Kumar Das
Journal of Computers , 2011, DOI: 10.4304/jcp.6.11.2408-2416
Abstract: Mobile ad hoc networks (MANETs) are known to be unprotected due to the nature of message propagation and the openness of public channel. Another important characteristic of MANETs is their being basically energy constrained. While it is known that symmetric key cryptography provides a high degree of secrecy and efficiency, but has a number of significant difficulties for the MANET domain in key distribution, key management, scalability and provision of non-repudiation. Public key cryptography (PKC) on other hand provides solutions to the problems inherent in symmetric key cryptography with authenticated key agreement protocols. However the constraints of MANETs such as mobility of nodes, lack of network services and servers make such a proposition difficult. In this paper, we propose a PKC based new energy efficient twoparty mutual authenticated key agreement protocol suitable for MANETs. Its security is based on the elliptic curve discrete logarithm assumption.We provide proof here for the security of the proposed protocol and show its relative better performance when compared with other relevant protocols.
RB-GDM: A Role-Based Grid Delegation Model
G Geethakumari,Dr Atul Negi,Dr V N Sastry
International Journal of Computer Science and Security , 2008,
Abstract: Grid delegation is the procedure by which a valid user endows another user or a program or service with the ability to act on that user ¢a a ¢s behalf. Delegation is the primary form of authorization in grids. The large and geographically distributed, dynamic, heterogeneous and scalable grid environment poses unique delegation requirements. Presently there are no standard mechanisms to guide grid delegation. As credential delegation has its own limitations in a dynamic grid environment, a new conceptual model is required to effectively formulate the grid delegation requirements. In this paper, we present a framework called Role- Based Grid Delegation Model (RB-GDM) for delegating access rights in grids. The basic unit of delegation in our model is role. Derived from the standard RBAC formalisms, this framework explores various approaches for authorization and revocation of delegation.
Nanomechanical Analysis of Hybrid Silicones and Hybrid Epoxy Coatings—A Brief Review  [PDF]
Atul Tiwari
Advances in Chemical Engineering and Science (ACES) , 2012, DOI: 10.4236/aces.2012.21005
Abstract: This review article is written on the investigations of nanomechanical properties of coatings by using nanoindentation techniques. The focus is on the studies that were conducted on epoxy polymer, silicones and their hybrid materials. The article describes a large number of developmental studies that are conducted on coatings. Materials properties such as nanoindentation hardness, modulus, scratch, wear and viscoelastic behavior have been described. Moreover, the article summarizes various studies that mention the use of different nanoparticles in coating formulations that could improve the mechanical strength and service life span of the coatings. The mode and mechanism of material’s failure has been outlined and discussed.
Virtual Worlds for Student Engagement  [PDF]
Atul Sajjanhar
Creative Education (CE) , 2012, DOI: 10.4236/ce.2012.326118
Abstract: In this paper, we study the scope of virtual worlds for student engagement in higher education. The motivation for the study is the gap in opportunities for interactivity that exist for off-campus students compared with on-campus students. A student taking a course at a university, while located in a different geographic location, has limited opportunity for student-student and student-teacher interaction; this effects student engagement significantly. We conduct a feasibility analysis for engaging students in a virtual world; Second Life is used as the test-bed to create the virtual world environment. We present preliminary findings, the promises and the limitations of Second Life as an immersive environment for engaging students.
Golden Research Thoughts , 2013, DOI: 10.9780/22315063
Abstract: Every country governed by constitutionalism is bound to follow the principles and rules made by the fundamental document of the country. Our constitution embodies parliamentary form of government based on Westminster (British) model. Under this form the council of ministers is collectively responsible to the Lok Sabha. They hold office only if the majority in Lok Sabha supports. And none of the minister is suppose to express his individual view inconsistent with party policy. In parliamentary democracy the mandate to rule the state is given not to any individual but to a particular party. When any individual secure votes because of his allegiance to political party and after winning if he gives up the membership of that party or become disloyal to then should there be any penalty for those defectors. Or once a person gets elected as an independent candidate, the mandate of the voters is that he should remain independent throughout his tenure in the house and under no circumstances he should join any political party. This policy of aaya ram and gaya ram followed by some of the leaders under lust for post and power is strictly undertaken by our constitution in tenth schedule titled as to disqualification on ground of defection popularly known as anti-defection law. The paper seeks to examine the law on defection with special reference to the role of speaker in context of judicial review.
Antioxidant and Antibacterial Activities in the Leaf Extracts of Indian Borage (Plectranthus amboinicus)  [PDF]
Praveena Bhatt, Pradeep S. Negi
Food and Nutrition Sciences (FNS) , 2012, DOI: 10.4236/fns.2012.32022
Abstract: The different solvent extracts of the leaves of Plectranthus amboinicus were evaluated for their antioxidant and anti-bacterial properties. The ethyl acetate extract of the leaves which had the highest polyphenolic content showed an appreciable DPPH radical scavenging activity as well as total antioxidant capacity as compared with extracts obtained using hexane, acetone, methanol, hydroalcohol and freeze dried form. The acetone extract of the leaves which had the second highest polyphenolic content showed appreciable antibacterial activity with least MIC values against the tested foodborne pathogens namely Staphylococcus aureus, Bacillus cereus, Escherichia coli and Yersinia enterocolitica. The findings indicated the potentiality of ethyl acetate and acetone extract of the leaves of Indian borage for use as biopreservatives as they showed high antioxidant and antibacterial activities.
A Large Celiac Artery Aneurysm  [PDF]
Harinder Singh Bedi, Kamal Negi
World Journal of Cardiovascular Surgery (WJCS) , 2013, DOI: 10.4236/wjcs.2013.33019
Abstract: We report preoperative, intraoperative and postoperative images of a large celiac artery aneurysm.
The “Bedi-IMA Buttress”: Reinforcement of the Bronchial Stump with a Pedicled Internal Mammary Artery Buttress in Diabetic Patients after Lung Resection  [PDF]
Harinder Singh Bedi, Kamal Negi
World Journal of Cardiovascular Surgery (WJCS) , 2014, DOI: 10.4236/wjcs.2014.412032
Abstract: Objective: The development of a bronchopleural fistula is a devastating complication after lung resection. We describe a new method of buttressing the closure of the stump in diabetic patients using a pedicled internal mammary artery buttress flap to avoid a bronchopleural fistula. Methods: An internal mammary pedicled flap was used in 14 diabetic patients of lung resection to cover the bronchial stump. Results: The flap of viable vascularized muscle mass gave an excellent coverage of the bronchial stump. All patients recovered well with no bronchopleural fistula. Conclusions: We recommend this technique as a method of buttressing the bronchial stump in cases of lung resection, as the internal mammary artery is easily available and its use is not associated with any side effects.
Exploring Second Life as a Learning Environment for Computer Programming  [PDF]
Atul Sajjanhar, Julie Faulkner
Creative Education (CE) , 2014, DOI: 10.4236/ce.2014.51010

Computer programming can be challenging for beginners because of the need to understand abstract programming concepts. In this paper, we study the use of the Second Life (SL) virtual world for learning computer programming concepts. We conduct an empirical study for learning computer programming in SL by addressing affordances of SL for experiential problem-based learning pedagogies. We present preliminary findings, the promises and the limitations of Second Life as an environment for learning computer programming.

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