PURKH (E-Journals)
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Precise Asymptotics in Wichura's Law of Iterated Logarithm
Get PDFLet {Xn, n ≥ 1} be a sequence of independent and identically distributed random variables with a common distribution function F = P(X ≤ x) in the domain of attraction of an asymmetric stable law, with index α, 1 < α < 2 and set Sn=∑nK=1XK. We prove
limε->0(√ε) ∑n≥3(1/n)P(Sn≤(θα-ε)An )=1/(2√2α),
where An = n1/α(log log n)((α-1)/α) θα =(B(α))((α-1)/α) and B(α) = (1 − α)α(α/(1-α)) (cos (πα/2)) (α/α-1
Possibility to Realize an Accelerated Turing Machine
Get PDFOn the basis of a theorem, in which an evanescent photon is a superluminal particle, the author considers the possibility of realizing a high performance computer system compared with conventional silicon processors. To realize such a quantum computer utilizing evanescent photons, we must replace electronic components with optical ones, and thus an equivalent optical transistor is required. This critical component for quantum computing can be created using meta-material circuits with a non-linear refractive index. Based on this optical computer system, utilizing meta-material technology, it can be shown that superluminal computation, which is a new concept for an accelerated Turing machine, can be realized in the physical world
Robust RLS Wiener Fixed-Lag Smoother for Discrete-Time Stochastic Systems with Uncertain Parameters
No full textThis paper, by combining the robust recursive least-squares (RLS) Wiener filter and the RLS Wiener fixed-lag smoothing algorithm, proposes the robust RLS Wiener fixed-lag smoothing algorithm. In the robust estimation problem, it is assumed that the system and observation matrices include some uncertain parameters. With the observations generated by the state-space model including the uncertain parameters, the robust RLS Wiener fixed-lag smoother estimates the signal recursively as the time advances. Both the signal and the degraded signal processes are fitted to the finite order auto-regressive (AR) models. The robust RLS Wiener fixed-lag smoother uses the following information. (1) The covariance function of the state for the degraded signal. (2) The cross-covariance function of the state for the signal with the state for the degraded signal. (3) The observation matrices for the signal and the degraded signal. (4) The system matrices for the signal and the degraded signal. (5) The variance of the white observation noise. A numerical simulation example shows that the robust RLS Wiener fixed-lag smoother, proposed in this paper, is superior in estimation accuracy to the H-infinity RLS Wiener fixed-point smoother and the RLS Wiener fixed-lag smoother. In the appendix, by using MAXIMA and MATLAB, the derivation method of the coefficients, used in the robust RLS Wiener fixed-lag smoothing algorithm, is shown
Analysis of Qos Aware Cloud Based Routing for Improved Security
Get PDFThe recent advances and the convergence of micro electro-mechanical systems technology, integrated circuit technologies, microprocessor hardware and Nano-technology, wireless communications, Ad-hoc networking routing protocols, distributed signal processing, and embedded systems have made the concept of Wireless Sensor Networks (WSNs). Sensor network nodes are limited with respect to energy supply, restricted computational capacity and communication bandwidth. Most of the attention, however, has been given to the routing protocols since they might differ depending on the application and network architecture. To prolong the lifetime of the sensor nodes, designing efficient routing protocols is critical. Even though sensor networks are primarily designed for monitoring and reporting events, since they are application dependent, a single routing protocol cannot be efficient for sensor networks across all applications. In this paper, we analyze the design issues of sensor networks and present a classification and comparison of routing protocols. This comparison reveals the important features that need to be taken into consideration while designing and evaluating new routing protocols for sensor networks. A reliable transmission of packet data information, with low latency and high energy-efficiency, is truly essential for wireless sensor networks, employed in delay sensitive industrial control applications. The proper selection of the routing protocol to achieve maximum efficiency is a challenging task, since latency, reliability and energy consumption are inter-related with each other. It is observed that, Quality of Service (QoS) of the network can improve by minimizing delay in packet delivery, and life time of the network, can be extend by using suitable energy efficient routing protocol
Image Fusion: A Review
Get PDFAt the present time, image fusion is considered as one of the types of integrated technology information, it has played a significant role in several domains and production of high-quality images. The goal of image fusion is blending information from several images, also it is fusing and keeping all the significant visual information that exists in the original images. Image fusion is one of the methods of field image processing. Image fusion is the process of merging information from a set of images to consist one image that is more informative and suitable for human and machine perception. It increases and enhances the quality of images for visual interpretation in different applications. This paper offers the outline of image fusion methods, the modern tendencies of image fusion and image fusion applications. Image fusion can be performed in the spatial and frequency domains. In the spatial domain is applied directly on the original images by merging the pixel values of the two or more images for purpose forming a fused image, while in the frequency domain the original images will decompose into multilevel coefficient and synthesized by using inverse transform to compose the fused image. Also, this paper presents a various techniques for image fusion in spatial and frequency domains such as averaging, minimum/maximum, HIS, PCA and transform-based techniques, etc.. Different quality measures have been explained in this paper to perform a comparison of these methods
Annual Reviewer Acknowledgement
No full textThe Editorial team of the journal would like to thank the following reviewers for their work in refereeing manuscripts during 201
Excitation of 9F Levels of Gadolinium Atom Belonging to 4f75d6s6p Configuration
Get PDFThe excitation of 9F levels of gadolinium atoms related to the 4f75d6s6p configuration was examined by the method of extended crossing beams with registration of the excited atom radiation. 68 excitation cross sections were measured at the incident electron energy of 30 eV. Optical excitation functions (OEF) in the electron energy range 0-200 eV were recorded for transitions from 13 levels. The direct excitation channel as well as the OEF features are discussed. A comparison with the results of an earlier experiment is given
K-State Solutions To The Dirac Equation For The Quadratic Exponential-Type Potential Plus Eckart Potential And Coulomb-Like Tensor Interaction Using Nikiforov-Uvarov Method
Get PDFWe solve the Dirac equation for the quadratic exponential-type potential plus Eckart potential including a Coulomb-like tensor potential with arbitrary spin–orbit coupling quantum number κ. In the framework of the spin and pseudospin (spin) symmetry, we obtain the energy eigenvalue equation and the corresponding eigenfunctions in closed form by using the Nikiforov–Uvarov method. Also Special cases of the potential are been considered and their energy eigen values, as well as their corresponding eigen functions, are obtained for both relativistic and non-relativistic scope
Characterization on DECY-13 Cyclotron Components
Get PDFThe development of Decy-13 Cyclotron at the Center for Accelerator Science and Technology, National Nuclear Energy Agency of Indonesia is nearly to be finalized in construction. This cyclotron is very important to produce radioisotopes used in Positron Emission Tomography Imaging Technique which is growing in Indonesia. In the next few years the cyclotron will be commissioned in getting energy proton beam. However, the characterization of the cyclotron components has not been reviewed. The characterization has been done by investigation and testing of the cyclotron components. The investigation of the central region design was done by simulating the beam path, testing of the ion source was done by measuring ion beam current, testing on magnet was done by mapping magnetic field and testing of roof system was done by measuring power of the rf generator. The results of the beam simulation showed that the initial path of the beam on the right track. Testing result of the ion source showed that the ion beam was more of adequate value. The magnetic field of the magnet was in the near of synchronous pattern. The performance of the rf generator still has to be increased in resulting power. These results provide information that most of cyclotron components that have been constructed, except the rf generator, have right characteristics that are accordance with the requirements
Nano Structural Properties of Lead Doped Cadmium Sulfide (Cd1-xPbxS) Thin Films Deposited by Spray Pyrolysis Technique: Some Structural Results on Prime Graphs
No full textLead doped cadmium sulfide thin films Cd1-xPbxS (0 ≤ x ≥ 0.20) were deposited onto a glass substrate at a temperature of 523K at a low-cost spray pyrolysis technique. They were characterized by their structural and optical properties, by energy dispersive x-ray analysis, scanning electron microscopy, x-ray diffraction respectively. X-ray diffraction patterns of the films are identified as (100), (002), (101), (102), (110), (103) and (201) planes which have a hexagonal crystal structure. No extra peak developing with the increasing Pd concentration. The direct bandgap energy of the film depends on the concentration. This value varies from 2.52 eV to 2.17 eV as required for solar cell and optoelectronic device applications