Secure and Efficient Context-Aware Localization of Drones in Urban Scenarios

Sharma, Vishal,Jayakody, Dushantha Nalin K.,You, Ilsun,Kumar, Ravinder,Li, Jun Institute of Electrical and Electronics Engineers 2018 IEEE communications magazine Vol.56 No.4

<P>Drone swarming involves multiple unmanned aerial vehicles (UAVs), which are able to manoeuver autonomously, providing a vast range of surveillance applications such as traffic evaluations, driver monitoring, disaster management, temporary network support, and pedestrian tracking. All these applications are an integral part of urban surveillance. In other words, cooperation between multiple drones can facilitate urban surveillance while being able to provide high-quality 3D visualization of the surroundings. This 3D representation is driven by the initiation of accurate and non-overlapping waypoints. Such efficient localization depends on the type of context and its security validation by the receiving entities. For example, a highly burdened context with negligible security is of limited use. This article presents a novel solution that is capable of securing the context information for sharing 3D waypoints between UAVs. The proposed approach achieves optimal localization through hierarchical context- aware aspect-oriented Petri nets while being powered by a novel drone context-exchange protocol for security validations.</P>

Effect of core strengthening with pelvic proprioceptive neuromuscular facilitation on trunk, balance, gait, and function in chronic stroke

Vishal Sharma,Jaskirat Kaur 한국운동재활학회 2017 JER Vol.13 No.2

Assessment and Optimization of Cutting Parameters while Turning AISI 52100 Steel

Vishal S Sharma,Suresh Dhiman,Rakesh Sehgal,Surinder Kumar Sharma 한국정밀공학회 2008 International Journal of Precision Engineering and Vol.9 No.2

This investigation deals with machining AISI 52100 steel using a carbide-coated tool. The machining cutting force and tool tip temperature are measured online while turning using different cutting parameters. The surface roughness is also measured, but off-line after each cut. The obtained data are analyzed and the influence of the Cutting parameters on the machining variables is determined in the form of plots. Regression models obtained from the results are tested using additional experimental data.

Degradation analysis of PCDTBT:PC71BM organic solar cells-an insight

Vishal Sharma,Vinamrita Singh,Manoj Arora,Swati Arora,R.P. Tandon 한국물리학회 2016 Current Applied Physics Vol.16 No.3

The current density-voltage (J-V) characteristics were measured for poly [N-900-heptadeca-nyl-2,7- carbazole-alt-5,5-(40,70-di-2-thienyl-20,10,30-benzo-thiadiazole)]:[6,6]-phenyl-C71-butyric acid methyl ester (PCDTBT:PC71BM) solar cells and studied for degradation analysis up to 150 h of fabrication. It was observed that the dark J-V characteristics in the degraded cell could be explained using both driftdiffusion (D-D) model and space charge limited current (SCLC) model. The D-D model could explain the J-V characteristics at initial voltage region, while SCLC model fitted well in the later part. By comparing the experimental data with theoretical curves, it was found that the transition from D-D model to SCLC model depends on the span of degradation. The results indicated an increase of traps and decrease of charge carrier mobility which may lead to degradation of organic solar cells. This work gave an insight into the degradation mechanism influencing the performance of organic solar cells.

Secure and Energy-Efficient Handover in Fog Networks Using Blockchain-Based DMM

Sharma, Vishal,You, Ilsun,Palmieri, Francesco,Jayakody, Dushantha Nalin K.,Li, Jun IEEE 2018 IEEE communications magazine Vol.56 No.5

<P>Modern fog network architectures, empowered by IoT applications and 5G communications technologies, are characterized by the presence of a huge number of mobile nodes, which undergo frequent handovers, introducing a significant load on the involved network entities. Considering the distributed and flat nature of these architectures, DMM can be the only viable option for efficiently managing handovers in these scenarios. The existing DMM solutions are capable of providing smooth handovers, but lack robustness from the security point of view. Indeed, DMM depends on external mechanisms for handover security and uses a centralized device, which has obvious security and performance implications in flat architectures where hierarchical dependencies can introduce problems. We propose a new DMM schema based on the blockchain, capable of resolving hierarchical security issues without affecting the network layout, and also satisfying fully distributed security requirements with less consumption of energy.</P>

Efficient Management and Fast Handovers in Software Defined Wireless Networks Using UAVs

Sharma, Vishal,Song, Fei,You, Ilsun,Chao, Han-Chieh IEEE 2017 IEEE network Vol.31 No.6

<P>Compared to traditional networking, SDN has better controllability and visibility for network components, which enable better management by using the common controller. In this article, the standard architecture of SDN is enhanced to utilize UAVs as on-demand forwarding switches. The proposed approach can achieve efficient management and fast handovers by decreasing the handover latency, E2E delay, and signaling overheads. The illustrated scenarios will help in understanding the impact of existing handover approaches in the next generation wireless networks, especially the upcoming 5G, which includes small cells, UAVs, UEs, and so on. The simulation study shows that scenarios with both UAVs and small cells perform better than scenarios with only small cells. The results in this article show that the proposed SDN-based handover scenarios perform better than the existing 4G-LTE handover for UAVs.</P>

Assessment and Optimization of Cutting Parameters while Turning AISI 52100 Steel

Sharma, Vishal S.,Dhiman, Suresh,Sehgal, Rakesh,Sharma, Surinder Kumar Korean Society for Precision Engineering 2008 International Journal of Precision Engineering and Vol.9 No.2

This investigation deals with machining AISI 52100 steel using a carbide-coated tool. The machining cutting force and tool tip temperature are measured online while turning using different cutting parameters. The surface roughness is also measured, but off-line after each cut. The obtained data are analyzed and the influence of the cutting parameters on the machining variables is determined in the form of plots. Regression models obtained from the results are tested using additional experimental data.

Secure and efficient protocol for fast handover in 5G mobile Xhaul networks

Sharma, Vishal,You, Ilsun,Leu, Fang-Yie,Atiquzzaman, Mohammed Academic Press 2018 Journal of network and computer applications Vol.102 No.-

<P><B>Abstract</B></P> <P>Mobile networks are observing an all time increase in the number of users and services. These networks have hit the 5G requisites in no time. Current service providers are aiming at resolving issues of subsisting networks by exploiting the capacity and coverage enhancement features of 5G. With a broad spectrum, it has now become more facile to accommodate an astronomically immense number of devices each having multiple applications authoritatively mandating network accessibility. Despite these advantages, such networks suffer from several issues cognate to smooth operations of fronthaul and backhaul, such as interference management, link-reliability, flatness, security and flexibility. Integrating fronthaul and backhaul together as a Xhaul is suggested as one of the efficient solutions for handling these issues. Xhaul forms integrated planes which use heterogeneous switches for high optical transmissions. Despite being efficient, Xhaul links are weak in terms of security. The situations will be more serious, particularly when a massive number of User Equipment (UE) and IoT devices are now connected to it. This issue is further raised when the terminal fortifying the fronthaul and backhaul moves leading to the formation of mobile Xhaul network. The current security solutions for WiFi, WiMax, WiBro, 4G/LTE are unable to fortify privacy and perfect forward secrecy in mobile Xhaul network, which is a quandary targeted in this paper. To resolve these issues, a novel key exchange and authentication protocol is proposed, which is capable of securing Xhaul links for a moving terminal in the network. The proposed approach is tested utilizing mobile ground node and drone as moving terminal across multiple hubs. The formal analysis utilizing BAN logic and AVISPA tool slake the security requisites and performance evaluation justifies the efficiency in comparison with the existing solutions.</P>

Resource-based mobility management for video users in 5G using catalytic computing

Sharma, Vishal,You, Ilsun,Kumar, Ravinder Elsevier 2018 Journal of Computer Communications Vol.118 No.-

<P><B>Abstract</B></P> <P>The upcoming 5G era emphasizes on a dramatic increase in the transmission rate of smartphone traffic. With more users operating at high rates, the type of data shared over the network is going to be complex and a majority of it will include video traffic. Such complex structure of traffic and heavy load over the components of the network are difficult to control. Further, the mobility of users adds up to this issue and makes it difficult to manage and operate the network without any breakdown. Thus, it important to control traffic as well as manage the mobility of users to provide efficient communication, which can support video traffic at high delivery rates. This paper proposes a novel resource-based mobility management approach for 5G networks comprising video users. A novel resource sharing paradigm, termed as “Catalytic Computing”, provides efficient management of user mobility as well as network resources. The proposed approach relies on Homogeneous discrete Markov model for user mobility patterns and a novel n-step algorithm for congestion prediction and selection of optimal routes between the serving terminals. An activation energy based handover mechanism is also presented in this paper, which reduces the handover latency in comparison with the existing solutions. The evaluation presented in the paper suggests that the proposed approach provides a minimum of 5.9 ms, maximum of 9.1 ms and an average of 6.5 ms latency during handoffs.</P>

Recent advances in enhanced photocatalytic activity of bismuth oxyhalides for efficient photocatalysis of organic pollutants in water: A review

Kirti Sharma,Vishal Dutta,Sheetal Sharma,Pankaj Raizada,Ahmad Hosseini-Bandegharaei,Pankaj Thakur,Pardeep Singh 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.78 No.-

Recently, layered bismuth oxyhalides (BiOX, X = F, Cl, Br and I) have received significant attention aspotential photocatalysts for energy and environment applications. However, limited visible light activityand recombination of photogenerated charge carriers limit their applications for photocatalytic waterpurification. In this review, various strategies such as heterojunction formation, metal/non-metal doping,interface modification, enhancement in Bi content, inner coupling between different BiOX photocatalyst,use of sensitizers and creation of oxygen vacancies was deliberated for improved photocatalyticperformance of BiOX. The integration of BiOX with other photocatalysts, mechanism for enhancedactivity and conclusive outlook with future challenges was also elaborated.