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Search Results: 1 - 10 of 153 matches for " Pratik Jawanpuria "
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A Convex Feature Learning Formulation for Latent Task Structure Discovery
Pratik Jawanpuria,J. Saketha Nath
Computer Science , 2012,
Abstract: This paper considers the multi-task learning problem and in the setting where some relevant features could be shared across few related tasks. Most of the existing methods assume the extent to which the given tasks are related or share a common feature space to be known apriori. In real-world applications however, it is desirable to automatically discover the groups of related tasks that share a feature space. In this paper we aim at searching the exponentially large space of all possible groups of tasks that may share a feature space. The main contribution is a convex formulation that employs a graph-based regularizer and simultaneously discovers few groups of related tasks, having close-by task parameters, as well as the feature space shared within each group. The regularizer encodes an important structure among the groups of tasks leading to an efficient algorithm for solving it: if there is no feature space under which a group of tasks has close-by task parameters, then there does not exist such a feature space for any of its supersets. An efficient active set algorithm that exploits this simplification and performs a clever search in the exponentially large space is presented. The algorithm is guaranteed to solve the proposed formulation (within some precision) in a time polynomial in the number of groups of related tasks discovered. Empirical results on benchmark datasets show that the proposed formulation achieves good generalization and outperforms state-of-the-art multi-task learning algorithms in some cases.
Efficient Output Kernel Learning for Multiple Tasks
Pratik Jawanpuria,Maksim Lapin,Matthias Hein,Bernt Schiele
Computer Science , 2015,
Abstract: The paradigm of multi-task learning is that one can achieve better generalization by learning tasks jointly and thus exploiting the similarity between the tasks rather than learning them independently of each other. While previously the relationship between tasks had to be user-defined in the form of an output kernel, recent approaches jointly learn the tasks and the output kernel. As the output kernel is a positive semidefinite matrix, the resulting optimization problems are not scalable in the number of tasks as an eigendecomposition is required in each step. \mbox{Using} the theory of positive semidefinite kernels we show in this paper that for a certain class of regularizers on the output kernel, the constraint of being positive semidefinite can be dropped as it is automatically satisfied for the relaxed problem. This leads to an unconstrained dual problem which can be solved efficiently. Experiments on several multi-task and multi-class data sets illustrate the efficacy of our approach in terms of computational efficiency as well as generalization performance.
Cryptographic Schemes Based on Elliptic Curves over the Ring Zp[i]  [PDF]
Manoj Kumar, Pratik Gupta
Applied Mathematics (AM) , 2016, DOI: 10.4236/am.2016.73027
Abstract: Elliptic Curve Cryptography recently gained a lot of attention in industry. The principal attraction of ECC compared to RSA is that it offers equal security for a smaller key size. The present paper includes the study of two elliptic curve \"\" and \"\" defined over the ring \"\" where \"\". After showing isomorphism between \"\" and \"\" , we define a composition operation (in the form of a mapping) on their union set. Then we have discussed our proposed cryptographic schemes based on the elliptic curve \"\". We also illustrate the coding of points over E, secret key exchange and encryption/decryption methods based on above said elliptic curve. Since our proposed schemes are based on elliptic curve of the particular type, therefore the proposed schemes provides a highest strength-per-bit of any cryptosystem known today with smaller key size resulting in faster computations, lower power assumption and memory. Another advantage is that authentication protocols based on ECC are secure enough even if a small key size is used.
Simulation Study of Active Noise Control in Wind Turbines Using FxLMS Adaptation Algorithm  [PDF]
Soumya Roy, Pratik Naik
Journal of Power and Energy Engineering (JPEE) , 2017, DOI: 10.4236/jpee.2017.58006
Abstract: Utility scale wind turbines produce a significant amount of noise which has been identified as one of the most critical challenges to the widespread use of wind energy. Aerodynamic noise caused primarily by the interaction of the boundary layer and (or) the upstream atmospheric turbulence with the trailing edge of the blade has been identified as the most dominant source of noise in wind turbines. The authors here propose an active noise control system based on the FxLMS algorithm which can achieve suppression of noise from a modern wind turbine. Two types of noise sources have been simulated: monopole and dipole. The results of the active noise control algorithm are validated with simulations in MATLAB. The agreement between the results shows the far impact of active noise control techniques will have in future wind turbines.
Radiation Safety Issues in Fluoroscopy During Percutaneous Nephrolithotomy
Pratik Kumar
Urology Journal , 2008,
Abstract: Introduction: Fluoroscopy-guided intervention during percutaneous nephrolithotomy (PCNL) has become the order of the day. During this procedure, both the patient and the physician are exposed to some radiation. Measurement of radiation doses in patients and personnel are important. Patient radiation doses are used for comparison with other centers for achieving the best possible radiation practice. In addition, there are performance checks for the fluoroscopy machines so that x-ray emitting machines should work at the optimum level ie, producing good images at minimum possible radiation doses. Material and Methods: This is a review of literature and discussion on radiation dose to patients and personnel, and on basic radiation safety tenets and their application in urological interventions of PCNL procedure. Results: Radiation doses during PCNL have gone down over the time due to advances in technology. However, as radiation is hazardous, there is no room for complacency. A hospital’s medical physicist may ensure even further reduction of x-ray dose by carrying out regular dosimetry and quality assurance tests on the fluoroscopy machines. A survey meter may provide an easy and quicker but not-so-accurate method for occupation exposure determination. Conclusion: The practice of PCNL procedures seems to be quite safe with radiation point of view. The quick, easy, and economical method of estimation of radiation dose using survey meter may need further calibration with the standard thermoluminescence dosimetry method. Setting optimum x-ray parameters, incorporation of filters, and quality assurance tests are a few areas where medical physicists may help in further reduction of radiation doses.
The effect of homecare team visits in terminal cancer patients: Role of health teams reaching patients homes
Banerjee Pratik
Indian Journal of Palliative Care , 2009,
Abstract: Aim: The study has been conducted to see the effectiveness of homecare teams visit in terminal cancer patients (palliative care). Materials and Methods: The study basically utilized the effectiveness of the Cansupport′s functioning. Cansupport is unique in its organization and function. It is the first organization in India that started the homecare visits for the terminal cancer patients. It has its headquarter with the administrative staff and a helpline that is officially active for about 8 hours a day for 5 days a week. The organization also has 10 homecare teams who are involved in the home visit. They have recently had an added support of community network officials. Each homecare team has a doctor, a nurse, and a counselor. Result: The total number of patients visited by the homecare teams of Cansupport in the year 2008-2009 was 1025. Total 104 patients were discharged. Out of 798 admissions last year, 384 patients were from IRCH (AIIMS). The helpline had 333 patients and others were just 81. Generally the team had to travel about 50-150 km a day. The number of visits range from four to seven per day. Generally the first visit of the team usually takes 90-120 min as the team takes time to understand the patient. The subsequent visits usually take 30-45 min. Usually, such patients stay with the team for a period of 1-2 months and then expire. Some patients stay with the team for 1-7 days. Conclusion: The eagerness of patients wanting the teams to reach their residence may be judged by the given figures. The total number of patients visited by the homecare teams of Cansupport in the year 2008-2009 was 1025. Out of them, there were about 104 patients who were discharged. The term discharge means that the patients were not interested in our visit or were not available in our subsequent visit. It has to be mentioned here that the service is a definite demand by society provided that the cost may be catered too.
Solution of Modified Equations of Emden-Type by Differential Transform Method  [PDF]
Supriya Mukherjee, Banamali Roy, Pratik Kumar Chatterjee
Journal of Modern Physics (JMP) , 2011, DOI: 10.4236/jmp.2011.26065
Abstract: In this paper the Modified Equations of Emden type (MEE), χ+αχχ+βχ 3 is solved numerically by the differential transform method. This technique doesn’t require any discretization, linearization or small perturbations and therefore it reduces significantly the numerical computation. The current results of this paper are in excellent agreement with those provided by Chandrasekar et al. [1] and thereby illustrate the reliability and the performance of the differential transform method. We have also compared the results with the classical Runge-Kutta 4 (RK4) Method.
Finite Element Assisted Numerical Comparison of Single and Two Phase Inductively Coupled Power Transfer Systems  [PDF]
Pratik Raval, Dariusz Kacprzak, Aiguo Patrick Hu
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2013, DOI: 10.4236/jemaa.2013.57048
Abstract:

Inductively coupled power transfer systems (ICPT) are becoming ubiquitous in industry. Many such systems are excited with single or multi-phase input current. This leads to increased complexity in comparing such systems when solely using the magnetic frequency analysis. This paper utilizes modern finite element method analysis software to propose a novel software methodology for the numerical comparison of single and two phase ICPT systems as demonstrated on a three dimensional (3D) battery charging system. The sinusoidal magnetic frequency response of a single phase system is compared to the magnetic transient response of a multi-phase current system by use of a novel software methodology proposed in this paper. This consists of a transient response analysis to determine compute the resulting magnetic response over the duration of an input current period on the two phase system. The resulting non-sinusoidal response is then integrated over a whole period to extract the root-mean-square value for comparison with that of a single phase system across a 3D cubic power zone.

Acute lymphocytic leukemia in sporadic neurofibromatosis
Gahalaut Pratik,Ali Mir
Indian Journal of Dermatology, Venereology and Leprology , 2007,
Abstract:
Azithromycin in ACNE: A protagonist for fixed drug reaction?
Gahalaut Pratik,Alexander Emy
Indian Journal of Dermatology , 2008,
Abstract:
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