1,682 research outputs found
De-duplication of photograph images using histogram refinement
No full textContent based image retrieval (CBIR), a technique which uses the content like color, texture and shape to search images from the large scale databases, is an active research area. In this paper, de-duplication process of photographs was implemented using CBIR. The CBIR technique uses color histogram refinement feature. The photograph data was divided into different clusters using k-means clustering algorithm. The clusters count depends on the numbers of photographs in each district of the state. The photo de-duplication exercise was carried out in a large photograph database which contains 22 million (approximately) photograph images. The experimental results shows that there were 0.35 million (approximately) duplicate photographs
A self enforcing and flexible security protocol for preventing Denial of Service attacks in wireless sensor networks
No full textTaking into account the recent growth in research and development in wireless sensor networks it has been shown that they have a lot of scope in future. It is more important to pay attention to the security of wireless sensor networks as they are highly prone to threats. In this paper we propose a protocol for establishing the security mechanism of wireless sensor networks and devising a scheme for preventing Denial of Service attacks. The protocol organizes the network using the derivative key to establish secure communication and also incorporates authentication check to detect any malicious sensor nodes. The paper discusses the harmful nature of Denial of Service attacks and the protocol incorporated to identify the malicious sender inflicting the attack on the server. The protocol not only defends the network against Denial of Service attacks but also maintains confidentiality, integrity and authenticity of data transmitted between sensor nodes.</p
Design of S bend waveguides for delay line applications in integrated optics
No full textA novel scheme for generation of phase using optical delay lines is proposed. The design of the optical components in the circuit which includes the S bend waveguides and straight waveguide couplers are very important for integrated optics. Beam propagation Method and MatLab is employed for the design
The network of photodetectors and diode lasers of the CMS Link alignment system
No full textArce, P., Barcala, J.M., Calvo, E., Ferrando, A., Josa, M.I., Molinero, A., Navarrete, J., Oller, J.C., Brochero, J., Calderón, A., Fernández, M.G., Gómez, G., González-Sánchez, F.J., Martínez-Rivero, C., Matorras, F., Rodrigo, T., Ruiz-Árbol, P., Scodellaro, L., Sobrón, M., Vila, I., Virto, A.L., Fernández, J., Raics, P., Szabó, Z., Trócsnyi, Z., Ujvári, B., Zilizi, G., Béni, N., Christian, G., Imrek, J., Molnar, J., Novak, D., Pálinkás, J., Székely, G., Szillási, Z., Bencze, G.L., Vestergombi, G., Benettoni, M., Gasparini, F., Montecassiano, F., Rampazzo, M., Zago, M., Benvenuti, A., Reithler, H., Jiang, C
Restoring light sensitivity using tunable near-infrared sensors
No full textEnabling near-infrared light sensitivity in a blind human retina may supplement or restore visual function in patients with regional retinal degeneration. We induced near-infrared light sensitivity using gold nanorods bound to temperature-sensitive engineered transient receptor potential (TRP) channels. We expressed mammalian or snake TRP channels in light-insensitive retinal cones in a mouse model of retinal degeneration. Near-infrared stimulation increased activity in cones, ganglion cell layer neurons, and cortical neurons, and enabled mice to perform a learned light-driven behavior. We tuned responses to different wavelengths, by using nanorods of different lengths, and to different radiant powers, by using engineered channels with different temperature thresholds. We targeted TRP channels to human retinas, which allowed the postmortem activation of different cell types by near-infrared light
Wireless sensors network based safe home to care elderly people : a realistic approach
No full textIn this paper, we present the design intricacies and implementation details of a wireless sensors network based safe home monitoring system targeted for the elderly people to provide a safe, sound and secured living environment in the society. Programmed system will minimize the number of false messages to be sent to care provider and supports inhabitant through suitable prompts and action to be performed when there is irregular behaviour in the daily activity. Developed system was tested at various elderly homes instead of test bed and the results are encouraging.5 page(s
Matrix based Cryptographic Procedure for Efficient Image Encryption
No full textIn this paper we propose a cryptographic
transformation based on matrix manipulations for image
encryption. Substitution and diffusion operations, based on the
matrix, facilitate fast conversion of plaintext and images into
ciphertext and cipher images. The paper describes the encryption
algorithm, discusses the simulation results and compares with
results obtained from Advanced Encryption Standard (AES). It
is shown that the proposed algorithm is capable of encrypting
images eight times faster than AES.Cochin University of Science and
TechnologyRecent Advances in Intelligent Computational Systems (RAICS), 2011 IEE
Search for resonant and nonresonant production of pairs of dijet resonances in proton-proton collisions at = 13 TeV
No full textA search for pairs of dijet resonances with the same mass is conducted in final states with at least four jets. Results are presented separately for the case where the four jet production proceeds via an intermediate resonant state and for nonresonant production. The search uses a data sample corresponding to an integrated luminosity of 138 fb−1 collected by the CMS detector in proton-proton collisions at s = 13 TeV. Model-independent limits, at 95% confidence level, are reported on the production cross section of four-jet and dijet resonances. These first LHC limits on resonant pair production of dijet resonances via high mass intermediate states are applied to a signal model of diquarks that decay into pairs of vector-like quarks, excluding diquark masses below 7.6 TeV for a particular model scenario. There are two events in the tails of the distributions, each with a four-jet mass of 8 TeV and an average dijet mass of 2 TeV, resulting in local and global significances of 3.9 and 1.6 standard deviations, respectively, if interpreted as a signal. The nonresonant search excludes pair production of top squarks with masses between 0.50 TeV to 0.77 TeV, with the exception of a small interval between 0.52 and 0.58 TeV, for supersymmetric R-parity-violating decays to quark pairs, significantly extending previous limits. Here, the most significant excess above the predicted background occurs at an average dijet mass of 0.95 TeV, for which the local and global significances are 3.6 and 2.5 standard deviations, respectively. © The Author(s) 2023.T
Azimuthal anisotropy of dijet events in PbPb collisions at = 5.02 TeV
No full textAbstract The path-length dependent parton energy loss within the dense partonic medium created in lead-lead collisions at a nucleon-nucleon center-of-mass energy of sNN = 5.02 TeV is studied by determining the azimuthal anisotropies for dijets with high transverse momentum. The data were collected by the CMS experiment in 2018 and correspond to an integrated luminosity of 1.69 nb−1. For events containing back-to-back jets, correlations in relative azimuthal angle and pseudorapidity (η) between jets and hadrons, and between two hadrons, are constructed. The anisotropies are expressed as the Fourier expansion coefficients vn, n = 2–4 of these azimuthal distributions. The dijet vn values are extracted from long-range (1.5 < |∆η| < 2.5) components of these correlations, which suppresses the background contributions from jet fragmentation processes. Positive dijet v2 values are observed which increase from central to more peripheral events, while the v3 and v4 values are consistent with zero within experimental uncertainties. © The Author(s) 2023.T
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