Abstract

A capacitive pressure sensor consists of a movable diaphragm which causes change in capacitance for an applied pressure. In order to achieve high sensitivity, a thin diaphragm of large area is employed with a small separation gap. This introduces non-linearity, decreases the dynamic range and increases the size of the sensor. Thus, an optimum sensor design is necessary to balance these trade-offs. This paper presents theoretical modeling and numerical simulations on various performance parameters like diaphragm deflection, change in capacitance, mechanical and capacitive sensitivities and nonlinearity of a clamped and normal mode elliptical capacitive pressure sensor for 0 – 8 kPa operating pressure range. This analysis can form the basis for compact modelling (CM) of circular and elliptical capacitive pressure sensors for simulation with large scale circuits. In all the designs of elliptical and circular …

Abstract

With the ever increasing adoption rate of Internet-enabled devices [also known as Internet of Things (IoT) devices] in applications such as smart home, smart city, smart grid, and healthcare applications, we need to ensure the security and privacy of data and communications among these IoT devices and the underlying infrastructure. For example, an adversary can easily tamper with the information transmitted over a public channel, in the sense of modification, deletion, and fabrication of data-in-transit and data-in-storage. Time-critical IoT applications such as healthcare may demand the capability to support external parties (users) to securely access IoT data and services in real-time. This necessitates the design of a secure user authentication mechanism, which should also allow the user to achieve security and functionality features such as anonymity and un-traceability. In this paper, we propose a new lightweight anonymous user authenticated session key agreement scheme in the IoT environment. The proposed scheme uses three-factor authentication, namely a user's smart card, password, and personal biometric information. The proposed scheme does not require the storing of user specific information at the gateway node. We then demonstrate the proposed scheme's security using the broadly accepted real-or-random (ROR) model, Burrows-Abadi-Needham (BAN) logic, and automated validation of Internet security protocols and applications (AVISPAs) software simulation tool, as well as presenting an informal security analysis to demonstrate its other features. In addition, through our simulations, we demonstrate that the proposed scheme outperforms existing related user authentication schemes, in terms of its security and functionality features, and computation costs.

Abstract

A dielectric elastomer actuator (DEA) is a capacitor with an elastomer as dielectric, sandwiched between two complaint electrodes. An electric potential difference applied across the electrodes results in an electric field that creates lateral motion in the device which can be used to perform mechanical work. However, both the dielectric as well as the electrodes needs to be mechanically compliant. In order to achieve high stretchability, carbon nanotube (CNT) based thin films are used as electrodes to maintain conductance even at large mechanical strains. These electrodes are typically fabricated using spray coating or filter transfer method and resemble a perforated electrode under high magnification. Hence, there can be loss of field and stray capacitance when multiple layers of carbon nanotube based electrodes are used. This paper presents theoretical modelling and finite element analysis (FEA) simulations to …

Abstract

Internet of Vehicles (IoV) is an intelligent application of Internet of Things (IoT) in smart transportation that takes intelligent commitments to the passengers to improve traffic safety and efficiency, and generate a more enjoyable driving and riding environment. Fog cloud-based IoV is another variant of mobile cloud computing where vehicular cloud and Internet can co-operate in more effective way in IoV. However, more increasing dependence on wireless communication, control, and computing technology makes IoV more dangerous to prospective attacks. For secure communication among vehicles, road-side units, fog and cloud servers, we design a secure authenticated key management protocol in fog computing-based IoV deployment, called AKM-IoV. In the designed AKM-IoV, after mutual authentication between communicating entities in IoV they establish session keys for secure communications. AKM-IoV is tested for its security analysis using the formal security analysis under the widely accepted real-or-random (ROR) model, informal, and formal security verification using the broadly accepted automated validation of Internet security protocols and applications (AVISPAs) tool. The practical demonstration of AKM-IoV is shown using the NS2 simulation. In addition, a detailed comparative study is conducted to show the efficiency and functionality and security features supported by AKM-IoV as compared to other existing recent protocols.

Abstract

The Internet of Things (IoT) comprises physical/virtual networked objects that collect and exchange data with each other via the public Internet. As this exchange often takes place over public networks, many security attacks in an IoT environment are possible. First, we briefly review the security issues in the IoT environment. Next, we focus on recent cryptographic protocol standards that are in use or have been recommended for IoT devices to ensure secure communications. We also highlight the advantages and weaknesses of the several protocol standards for various IoT application scenarios including connected vehicles, health, smart home, and consumer appliances and devices. Finally, we discuss some challenges in the area of cryptographic protocol standards that still require to be addressed for IoT applications in the future.

Abstract

ABSTRACT A method for producing an electronic device involves form ing a graphene precursor on a first portion of a common semiconductor substrate, forming a graphene layer on the graphene precursor, and forming a semiconductor device on a second portion of the common semiconductor substrate

Abstract

Micro-heating capabilities are important in applications such as thermotherapy, drug delivery, gas sensing and so on. Micro-heaters need to be designed such that they provide uniform temperature across a given surface with minimum metal consumption. In case of Joule heating based micro-heaters, the metal coil design plays an important role in determining its heating characteristics. This paper presents multiple designs of space filling curves that can be used as metal coils in micro-heaters to achieve uniform temperature distribution. We have modelled three types of fractal geometries of different orders - Peano, Hilbert and Moore. In order to compare the performance of these geometries with a typical double spiral heat-pad, we kept a fixed area of 30 mm × 30 mm and input power of 1 W. We have used PDMS (poly-dimethylsiloxane) of thickness 200 μm as a base for the heat-pad and copper is used for the

Abstract

The Internet of Things (IoT) acts as an umbrella for the Internet-enabled devices for various applications, such as smart home, smart city, smart grid, and smart healthcare. The emergence of the immense economic potential necessitates a robust authentication mechanism that needs to be lightweight and suitable for real-time applications. Moreover, the physical integrity of these devices cannot be assumed as these are designed to be deployed in an unattended environment with minimum human supervision. A user authentication mechanism for the IoT, in addition to guaranteeing user anonymity and un-traceability functionality requirements, must also be resistant to device physical capture and related misuses. In this paper, we present a novel lightweight anonymous user authentication protocol for the IoT environment by utilizing ‘‘cryptographic one-way hash function’’, ‘‘physically unclonable function (PUF)’’ and ‘‘bitwise exclusive-OR (XOR)’’ operations. The broadly accepted Real-Or-Random (ROR) model-based formal security analysis, formal security verification using the automated software verification tool, namely ‘‘automated validation of internet security protocols and applications (AVISPA)’’ and also non-mathematical (informal) security analysis have been carried out on the proposed scheme. It is shown that the proposed scheme has the ability to resist various well-known attacks that are crucial for securing the IoT environment. Through a detailed comparative study, we show that the proposed scheme outperforms other existing related schemes in terms of computation and communication costs, and also security & functionality features. Finally, a practical demonstration of the proposed scheme using the NS3 simulation has been provided for measuring various network performance parameters.

Abstract

We identify a set of dynamical maps of open quantum system, and refer to them as" -Markovian" maps. It is constituted of maps that possibly violate Markovianity but only a" little". We characterize the" -nonmarkovianity" of a general dynamical map by the minimum distance of that map from the set of -Markovian maps. We analytically derive an inequality which gives a bound on the -nonmarkovianity of the dynamical map, in terms of an entanglement-like resource generated between the system and its" immediate" environment. In the special case of a vanishing , this inequality gives a relation between the non-Markovianity of the reduced dynamical map on the system and the entanglement generated between the system and its immediate environment. We investigate the behavior of the measures for classes of amplitude damping and phase damping channels.

Abstract

A search for exotic decays of the Higgs boson to a pair of light pseudoscalar particles a 1 is performed under the hypothesis that one of the pseudoscalars decays to a pair of opposite sign muons and the other decays to b b‾. Such signatures are predicted in a number of extensions of the standard model (SM), including next-to-minimal supersymmetry and two-Higgs-doublet models with an additional scalar singlet. The results are based on a data set of proton-proton collisions corresponding to an integrated luminosity of 35.9 fb− 1, accumulated with the CMS experiment at the CERN LHC in 2016 at a centre-of-mass energy of 13 TeV. No statistically significant excess is observed with respect to the SM backgrounds in the search region for pseudoscalar masses from 20 GeV to half of the Higgs boson mass. Upper limits at 95% confidence level are set on the product of the production cross section and branching …