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ABSTRACT: Typical consumer digital cameras sense only one out of three color components per image pixel. The problem of demosaicing deals with interpolating those missing color components. In this paper, we present Compressive Demosaicing (CD), a framework for demosaicing natural images based on the theory of Compressed Sensing (CS). Given sensed samples of an image, CD employs a CS solver to find the sparse representation of that image under a fixed sparsifying dictionary ... As opposed to state of the art CS-based demosaicing approaches, we consider a clear distinction between the inter channel (color) and inter pixel correlations of natural images. Utilizing some well-known facts about the human visual system, those two types of correlations are utilized in a non-separable format to construct the sparsifying transform ... Our simulation results verify that CD performs better (both visually and in terms of PSNR) than leading demosaicing approaches when applied to the majority of standard test images.
IEEE Transactions on Image Processing 02/2013; · 3.04 Impact Factor
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ABSTRACT: This paper presents experimental studies for the production and propagation of an
electron beam from a single gap pseudospark discharge based plasma cathode electron (PCE)
gun. The generated electron beam has been successfully propagated for more than 25 cm in a
gaseous environment without application of external guiding magnetic field at different
operating conditions. The electron beam losses due to recombination with ions and collision
with walls of drift space have been estimated. The electron beam profile has also been
analyzed in the drift region of the gun.
Journal of Physics: Conference Series; 09/2012
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ABSTRACT: Metastases, and not the primary tumor from which they originate, are the main reason for mortality from carcinoma. Although the molecular mechanisms behind metastasis are poorly understood, it is clear that epigenetic dysregulation at the level of microRNA expression is a key characteristic of the metastatic process that can be exploited for therapy. Here, we describe an miRNA-targeted therapeutic approach for the prevention and arrest of lymph node metastasis. Therapy relies on the inhibition of the pro-metastatic microRNA-10b. It is delivered to primary and lymph node metastatic tumor cells using an imaging-capable nanodrug that is designed to specifically home to these tissues. Treatment of invasive human breast tumor cells (MDA-MB-231) with the nanodrug in vitro downregulates miR-10b and abolishes the invasion and migration of the tumor cells. After intravenous delivery to mice bearing orthotopic MDA-MB-231-luc-D3H2LN tumors, the nanodrug accumulates in the primary tumor and lymph nodes. When treatment is initiated before metastasis to lymph nodes, metastasis is prevented. Treatment after the formation of lymph node metastases arrests the metastatic process without a concomitant effect on primary tumor growth raising the possibility of a context-dependent variation in miR-10b breast oncogenesis.Oncogene advance online publication, 14 May 2012; doi:10.1038/onc.2012.173.
Oncogene 05/2012; · 6.37 Impact Factor
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ABSTRACT: The pseudospark (PS) discharge is, however, more recently recognized as a different type of discharge which is capable of generating electron beams with the highest combined current density and brightness of any known type of electron source. PS discharge is a specific type of gas discharge, which operates on the left-hand side of the hollow cathode analogy to the Paschen curve with axially symmetric parallel electrodes and central holes on the electrodes. The PS discharge generated electron beam has tremendous applications in plasma filled microwave sources where normal material cathode cannot be used. Analysis of the electron beam profile has been carried out experimentally for different applied voltages. The investigation has been done at different axial and radial location inside the drift tube in argon atmosphere. This paper represents experimentally derived axial and radial variation of the beam current inside the plasma filled drift tube of PS discharge based plasma cathode electron (PCE) gun. With the help of current density estimation the focusing and defocusing point of electron beam in axial direction can be analyzed. It has been further confirmed the successful propagation of electron beam in confined manner without any assistance of external magnetic field.
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ABSTRACT: In the evolution of computing technology over the decades, file system capabilities have not grown in tandem to processing power. Today, scientific computing is highly data intensive and relies on workflows. Workflows developed are not portable among workflow management system. Also, scientific computation that rely on inherent workflows do not have a kernel support for workflows, and are executed essentially in a batch processing model. A file system that includes native kernel functionalities to support workflow execution would address the issue of parallel processing as well as portability. Such a file system would improve scientific computing performance. This paper describes an approach we developed to add workflow functionality to the Linux kernel and native file system to help simplify the use of workflow management systems for scientific computing.
Services (SERVICES), 2011 IEEE World Congress on; 08/2011
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ABSTRACT: Mobile telemedical applications are of crucial importance today as they do offer the potential to improve the quality of the health care related services. It has been proven that the leading cause of several illnesses and diseases are stress and the lack of fitness practices. Based on that, a system capable of estimating and monitoring both stress and fitness levels without a physical consultation of a medical specialist is presented in this work. A correlation between physiological parameters and stress or fitness is explored in the developed intelligent expert system. In order to enable the implementation of such a complex system, a flexible Telematics Platform is conceived. This Telematics Platform does guarantee a secure data communication involving encryption and a suitable visualization of the fitness and stress assessment results on both the patient's mobile phone and on a web-based portal. Moreover, the platform is scalable and can therefore be easily extended in order to support different kinds of telemedical applications. The system presented in this paper does enable the efficient and cost-effective stress and fitness monitoring of patients while being at home or practicing their daily jobs with their subsequent eventual mobility.
e-Health Networking Applications and Services (Healthcom), 2011 13th IEEE International Conference on; 07/2011
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ABSTRACT: Data warehouses contain vast amount of data from different sources. In order to maintain data in data warehouse according to the organization some designing approaches are important. Requirement Analysis and Conceptual Design are two of the key steps within the data warehouse design process. They are to a great extent responsible for the success of a data warehouse project since, during these two phases, the expressive of the multidimensional schemata is completely defined. In this paper we surveyed the literature related to the design approaches that have done in last few years and propose a comparative analysis of various design approaches according to its characteristic.
Communication Systems and Network Technologies (CSNT), 2011 International Conference on; 07/2011
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ABSTRACT: Most of the routing and replication algorithms for Mobile Peer to Peer (M-P2P) networks assume the network to be large and therefore, the architecture and algorithms are designed to be scalable. These algorithms however may not perform well with limited number of nodes in a network such as of UAVs. Thus, it is better to design algorithms to increase the efficiency of a small network if scalability is no longer an issue. For such small networks, we design and simulate an effective two layered graph based routing algorithm using store/forward concept. We also take into account UAVs orientation and configuration of radio communication hardware equipped with UAVs. Our routing algorithm provides good average connectivity in the network even while they are mobile. We use a single copy replication to increase the availability of data for distributed query processing. Our system has a network layer and application layer; both of which are integrated to provide better efficiency. We report performance results based on simulations by comparing reach-ability, path efficiency, availability and average connectivity.
Collaboration Technologies and Systems (CTS), 2011 International Conference on; 06/2011
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ABSTRACT: The Renewable energy sources, which have been expected to be a promising alternative energy source, can bring new challenges when it is connected to the power grid. On the basis of measurements and norms followed according to the guidelines specified in IEC-61400 (International Electro-technical Commission) standard, the performance of the wind turbine, power quality is determined. The power arising out of the wind turbine when it connected to grid system concerning the power quality measurements are-the active power, reactive power, voltage sag, voltage swell, flicker, harmonics, and electrical behaviour of switching operation and these are measured according to national/international guidelines. The paper clearly shows the existence of power quality problem due to installation of wind turbine with the grid. In this proposed scheme a FACTS device (STATCOM)} is connected at a point of common coupling with a battery energy storage system (BESS) to reduce the power quality problems. The FACTS Device (STATCOM) control scheme for the grid connected wind energy generation system to improve the power quality is simulated using MATLAB/SIMULINK in power system block set. The intended result of the proposed scheme relives the main supply source from the reactive power demand of the load and the induction generator.
Modelling Symposium (AMS), 2011 Fifth Asia; 06/2011
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ABSTRACT: A single gap Pseudospark based hollow cathode plasma electron gun has been developed at CEERI. An experimental investigation for the above electron gun was conducted at different operating conditions in argon and hydrogen atmosphere. The electron beam (current ≥ 50 amps, density ≈ 700 Acm-<sup>2</sup>) is travelling more than 200 mm in the drift region through gaseous environment without using guiding magnetic field. Theoretical studies for the initiation phase of Pseudospark discharges have also been carried out by two dimensional kinetic simulation code (OOPIC-Pro). The pre-breakdown and breakdown phases of a pseudospark discharge have been investigated. The spatial and temporal behavior of the electron density at the anode have been reported as a function of the hollow cathode dimension, gas types & their pressure and mean velocities of injected seed electrons at the cavity back wall.
Vacuum Electronics Conference (IVEC), 2011 IEEE International; 03/2011
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ABSTRACT: There is significant scientific evidence demonstrating that excessive exposure to ultraviolet (UV) radiation in sunlight and from artificial sources may cause acute and chronic adverse health effects to skin and eye. The Global Solar UV Index (UVI) describes the level of solar UV radiation at the Earth's surface. The higher the index value, the greater the potential for damage to the skin and eye, and the less time it takes for harm to occur. In this letter, we report on a demonstrator board suitably designed for UVI monitoring using visible blind high signal-to-noise ratio 4H-SiC Schottky photodiodes as UV light detectors.
IEEE Sensors Journal 03/2011; · 1.52 Impact Factor
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ABSTRACT: Nanophosphors of ZnO:Cu<sup>2+</sup> were synthesized by a chemical technique based on coprecipitation method. The synthesized nanophosphors were annealed at different temperatures (100-400°C) in steps of 100°C for 4 h. A reduction in photoluminescence intensity was observed with increase in the annealing temperature. Further, these nanophosphors were capped with citric acid, which results in enhancement in the luminescence intensity. These surface-modified ZnO nanoparticles were found to be remarkably stable. The reduction in luminescence with annealing temperature occurred due to removal of surface defects and intrinsic impurities, while the citric acid reduced the unsaturated bond density and passivated the surface, resulting in reduction in the number of surface trap sites for nonradiative recombination processes to occur, enhancing the luminescence intensity. Currently, LEDs giving UV emission have been combined with broadband visible green phosphors to make white-light LEDs. Thus, green luminescent ZnO:Cu<sup>2+</sup> nanoparticles can be seen as necessary and critical constituent for white light generation from UV LEDs, underlying the findings and importance of current investigations. Besides this citric acid capped ZnO:Cu<sup>2+</sup> nanophosphors can also be used in biological (drug delivery system, bioimaging, etc.) and biosensors.
IEEE Transactions on Nanotechnology 02/2011; · 2.29 Impact Factor
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ABSTRACT: This paper presents a nonlinear filter based on the Fokker-Planck equation (FPE) for uncertainty propagation, coupled with a fast measurement update step. The measurement update is implemented as a function approximation performed over a Markov chain Monte Carlo (MCMC) sample of the unnormalized posterior obtained from the Bayes rule. MCMC sampling also results in fast computation of the normalization factor of the posterior, which is typically a computationally heavy step. A previously developed semianalytical meshless tool is employed to solve FPE for high dimensional systems in real time. Performance of the filter is studied for dynamical systems with 2 and 4 dimensional state spaces.
Decision and Control (CDC), 2010 49th IEEE Conference on; 01/2011
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ABSTRACT: In this paper, we propose a real-time ground plane extraction and obstacle detection technique for mobile robot navigation based on a combination of segmentation and optical flow techniques using monocular image sequences. The ground plane, which is captured using a calibrated camera, mounted on a robot platform, has been segmented in a two step process. In the first step which is an offline process, the statistical properties of the ground plane are learned using a robust Gaussian Mixture Model (GMM) based segmentation method. In the online process, the ground plane is segmented using its learned signatures. Planar homography, between the 3D ground plane and the image plane has been used in depth map generation for the segmented images. We have also used the theoretical model of the optical flow field for the real-time moving obstacles detection. Regions of the ground plane, violating this theoretical model indicates the potential obstacle.
Emerging Trends in Robotics and Communication Technologies (INTERACT), 2010 International Conference on; 01/2011
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ABSTRACT: The pseudospark (PS) discharge has been shown to be a promising source of high
brightness, high intensity electron beam pulses. The PS discharge sourced electron beam has
potential applications in plasma filled microwave sources where normal material cathode
cannot be used. Analysis of the electron beamprofile has been done experimentally for different
applied voltages. The investigation has been carried out at different axial and radial location
inside the drift space in argon atmosphere. This paper represents experimentally found axial and
radial variation of the beam current inside the drift tube of PS discharge based plasma cathode
electron (PCE) gun. With the help of current density estimation the focusing and defocusing
point of electron beam in axial direction can be analyzed.
Journal of infrared, millimeter and terahertz waves 01/2011; 32:1415–1423. · 0.74 Impact Factor
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ABSTRACT: This paper presents a solution for detecting degradation in electrodes that interface to fluidic or biological systems that forms the basis of numerous actuation and sensing mechanisms in the bio-fluidics field. In this solution, a mid-frequency oscillation test strategy is proposed and evaluated experimentally on an array of electrodes. This technique is based on the sensitivity of the bio-fluidic interface capacitance to degradation, contamination and fouling.
Test Conference (ITC), 2010 IEEE International; 12/2010
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ABSTRACT: Computer images consist of large data and hence require more space to store in the memory. The compressed image requires less storing space of memory and less time to transmit. In this paper, feed forward back propagation neural network method with PCA technique is used for image compression. It is found that the results using PCA techniques are not satisfactory. To improve these results author suggest another technique which has better results. The Artificial Neural Network (ANN) used in these technique is trained by considering the different numbers of hidden neurons, epoch and reconstructed image compared with original image.
Advances in Recent Technologies in Communication and Computing (ARTCom), 2010 International Conference on; 11/2010
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ABSTRACT: Pseudospark discharge is a specific type of gas discharge, which operates on the left-hand side of the hollow cathode analogy to the Paschen curve with axially symmetric parallel electrodes and central holes on the electrodes. Plasma simulation is carried out to study the initiation phase of pseudospark discharges. The pre-breakdown and breakdown phases of a pseudospark discharge are investigated using the two-dimensional kinetic plasma simulation code OOPIC Pro. Trends in the electron density at the anode are presented as function of the hollow cathode dimensions and mean seed injection velocities at the cavity back wall. The plasma generation process by ionizing collisions is examined, showing the effect on supplying electrons that determine the density of the beam. The experiment has also been performed for the analysis of the pseudospark discharge. The predischarge is a function of hollow cathode dimension, bore hole diameter and trigger source position and for two case of seed electron energy. Applied voltage was also held steady during operation.
Vacuum Electron Sources Conference and Nanocarbon (IVESC), 2010 8th International; 11/2010
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ABSTRACT: As displays become cheaper and are incorporated into more and more devices, there has been an increased focus on image resizing techniques to fill an image to an arbitrary screen size. Traditional methods such as cropping or resampling can introduce undesirable losses in information or distortion in perception. Recently, content-aware image retargeting methods have been proposed which produce exceptional results. In particular, seam carving, proposed by Avidan and Shamir, has gained attention as an effective solution. However, there are many cases where it can fail. In this paper we propose an improved seam carving algorithm which incorporates antialiasing and thresholding techniques. Experiments have demonstrated superior performance over the current seam carving methods.
Signal Processing Systems (SIPS), 2010 IEEE Workshop on; 11/2010
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ABSTRACT: With the abundance and variety of display devices, novel image resizing techniques have become more desirable. Content-aware image resizing (retargeting) techniques have been proposed that show improvement over traditional techniques such as cropping and resampling. In particular, seam carving has gained attention as an effective solution, using simple filters to detect and preserve the high-energy areas of an image. Yet, it stands to be more robust to a variety of image types. To facilitate such improvement, we recast seam carving in a more general framework and in the context of filter banks. This enables improved filter design, and leads to a multiscale model that addresses the problem of scale of image features. We have found our generalized multiscale model to improve on the existing seam carving method for a variety of images.
Multimedia Signal Processing (MMSP), 2010 IEEE International Workshop on; 11/2010
