Indian Institute of Technology Bhubaneswar

About: Indian Institute of Technology Bhubaneswar is a education organization based out in Bhubaneswar, India. It is known for research contribution in the topics: Large Hadron Collider & Computer science. The organization has 1185 authors who have published 3132 publications receiving 48832 citations.

Distribution system planning considering reliable feeder routing

Abstract: The work presents an investigation on the role of reliability consideration in distribution system configuration and planning cost of radial distribution system. A direct search technique is applied for optimum planning which ensures only minimisation of planning cost. Furthermore, the concept of principle of optimality theorem makes the direct method more computationally efficient, reducing total numbers of radial paths. Reliability indices are computed to evaluate the reliability of systems with different feeder configurations. The proposed approach is also tested for optimal feeder routing with variation in number of substations, which provides the information on trade-off between optimality and reliability of the system configuration. Thus, the proposed approach is found to be highly effective in optimal feeder routing considering complex feeder configuration with multiple substations.

Effect of Gd doping on structure and photoluminescence properties of ZnO nanocrystals

Abstract: Gd doped ZnO nanoparticles with varying dopant concentration are synthesized by simple wet chemical method. X-ray diffraction measurements confirm that the prepared samples are of hexagonal wurtzite structure with grain size around 50–60 nm. Gd doping induces lattice expansion in ZnO as the average crystallite size increases with the evolution of Gd2O3 phase after Gd doping. Electron microscopic studies show the presence of two types of particle distribution belonging to ZnO and Gd2O3 phases with an average size of 55 nm where the later surrounds the surface of ZnO. UV–VIS spectra show red-shift of absorption band of ZnO with Gd doping. A suppression of band edge UV emission and intensification of visible emission is observed in the photoluminescence spectra of doped ZnO. This has been explained on the basis of incorporation of impurity levels by the dopant along with intrinsic defect such as oxygen vacancies in the band gap of ZnO.

Practical traceable multi-authority CP-ABE with outsourcing decryption and access policy updation

Abstract: Multi-authority ciphertext policy attribute-based encryption (CP-ABE) is one of the promising approaches where multiple authorities issue and manage various attributes to achieve fine-grained access control on stored data in cloud platforms. However, the practical use of multi-authority CP-ABE (MCP-ABE) requires satisfaction of different features. Firstly, in MCP-ABE, users having the same set of attributes must share the same decryption privileges. This may potentially lead to exposure of decryption keys by some malicious users. Thus, there is a need of designing MCP-ABE with traceability to overcome this problem. Secondly, as the cost of decryption increases with the complexity of access policy, it is preferred to provide the functionality of outsourcing decryption to reduce the computational burden on the user. Finally, the data owners must have flexibility to change the access policy. Hence, policy updation must be an integral part of MCP-ABE scheme. In this paper, we construct a new multi-authority CP-ABE scheme over large attribute universe with decentralization of authorities that supports white-box traceability along with policy updation and outsourcing decryption. Our proposed cryptosystem is built on prime order groups and supports monotonic access structures. These features improve efficiency and expressiveness of our system. We implemented our proposed cryptosystem in Charm cryptographic framework and analyzed its performance with a diverse set of test cases.