Indian Institute of Technology Delhi | Date: 2015-03-02
The present invention relates to techniques for determining unknown concentration of constituents of any known mixture. The said techniques comprising: obtaining a plurality of chromatograms relating to known concentration of known mixtures and at least one chromatogram relating to unknown concentration of the known mixture; converting each of the chromatograms into signal vectors; condensing the dimensions of each of the signal vectors for obtaining low dimensional signal vectors; processing the low dimensional signal vectors representing the chromatograms relating to known concentrations to obtain output values; and processing the at least one low dimensional signal vector representing the chromatogram relating to unknown concentration by utilizing the obtained output values for determining the unknown concentration of each of the constitutes of the known mixture.
Agency: European Commission | Branch: FP7 | Program: CP-FP | Phase: SST.2013.4-3. | Award Amount: 3.87M | Year: 2013
In passive safety, human variability is currently difficult to account for using crash test dummies and regulatory procedures. However, vulnerable populations such as children and elderly need to be considered in the design of safety systems in order to further reduce the fatalities by protecting all users and not only so called averages. Based on the finite element method, advanced Human Body Models for injury prediction have the potential to represent the population variability and to provide more accurate injurypredictionsthan alternatives using global injury criteria. However, these advanced HBM are underutilized in industrial R&D. Reasons include difficulties to position the models which are typically only available in one posture in actual vehicle environments, and the lack of model families to represent the population variability (which reduces their interestwhen compared to dummies). The main objective of the project will be to develop new tools to position and personalize these advanced HBM. Specifications will be agreed upon with future industrial users, and an extensive evaluation in actual applications will take place during the project. The tools will be made available by using an Open Source exploitation strategy and extensive dissemination driven by the industrial partners.Proven approaches will be combined with innovative solutions transferred from computer graphics, statistical shape and ergonomicsmodeling. The consortium will be balanced between industrial users (with seven European car manufacturers represented), academic users involved ininjury biomechanics, and partners with different expertise with strong potential for transfer of knowledge. By facilitating the generation of population and subject-specific HBM and their usage in production environments, the tools will enable new applications in industrial R&D for the design of restraint systems as well as new research applications.
Agency: European Commission | Branch: FP7 | Program: CP-IP | Phase: EeB.NMP.2013-2 | Award Amount: 9.38M | Year: 2013
The ECO-SEE project aims to develop new eco-materials and components for the purpose of creating both healthier and more energy efficient buildings. We will create and symbiotically use natural eco-materials for healthier indoor environments through hygrothermal (heat and moisture) regulation and the removal airborne contaminants through both chemical capture and photocatalysis. Our objectives include advancing state of the art in the technology and application of multifunctional bio-based insulation materials, vapour permeable and hygrothermal and moisture buffering finishes, together with wood panel products, to create both internal partition and external highly insulated wall panels. Novel chemical treatments and processes will be used to enhance volatile organic compound capture capacity of materials. We will also develop highly novel photocatalytic coatings using nanoparticle technology, which will be suitable for use in interior spaces and compatible with lime and wooden surfaces. Novel material development will be completed in partnership with world-class expert organisations in indoor environmental quality. We will also create a new holistic modelling framework that combines air quality, hygrothermal comfort and acoustic quality for the well-being of building users. We will take new products through to proof of concept development with prototype manufacture, large scale tests and pilot studies. We will deliver products with at least 15% lower embodied energy, at least 20% longer life, and, for at least 20% lower build costs. Our consortium brings together a multi-disciplinary team of world-class researchers from universities and research organisations with a number of large enterprises and innovative SMEs, whose combined expertise and capacity will lead commercial development and exploitation of our products. We will engage with stakeholders, including Public and Health authorities and standards committees, and deliver training and technical guidance.
Mummadi V.,Indian Institute of Technology Delhi
IEEE Transactions on Industrial Electronics | Year: 2011
In this paper, a robust digital proportionalintegralderivative (PID) controller is proposed for the H-bridge soft-switching boost converter (HSBC). This digital PID controller is designed to ensure load voltage regulation as well as to give robust performance with step loads and source rejection. The mathematical models of the H-bridge boost converter are formulated, using the system identification tool, and then used in digital PID design. Here, this compensator is designed in the direct digital domain according to a pole placement approach that uses sensitivity function shaping in order to ensure closed-loop converter system stability as well as robust performance against converter parameter uncertainties. To confirm this, design simulations have been carried out on a 60-W 2442-V HSBC. The experimental results are provided to validate the robust controller design concept. © 2006 IEEE.
Chaira T.,Indian Institute of Technology Delhi
Applied Soft Computing Journal | Year: 2011
This paper presents a novel intuitionistic fuzzy C means clustering method using intuitionistic fuzzy set theory. The intuitionistic fuzzy set theory considers another uncertainty parameter which is the hesitation degree that arises while defining the membership function and thus the cluster centers may converge to a desirable location than the cluster centers obtained using fuzzy C means algorithm. Also a new objective function which is the intuitionistic fuzzy entropy is incorporated in the conventional fuzzy C means clustering algorithm. This is done to maximize the good points in the class. This clustering method is used in clustering different regions of the CT scan brain images and these may be used to identify the abnormalities in the brain. Experimental results show the effectiveness of the proposed method in contrast to conventional fuzzy C means algorithms and also type II fuzzy algorithm. © 2010 Elsevier B.V. All rights reserved.
Bhatnagar M.R.,Indian Institute of Technology Delhi
IEEE Photonics Technology Letters | Year: 2012
We analyze performance of the decode-and-forward (DF) protocol in the free space optical (FSO) links following the Gamma-Gamma distribution. The cumulative distribution function (cdf) and probability density function (pdf) of a random variable containing mixture of the Gamma-Gamma and Gaussian random variables is derived. By using the derived cdf and pdf, average bit error rate of the DF relaying is obtained. © 2006 IEEE.
Indian Institute of Technology Delhi | Date: 2015-05-27
Techniques described herein are generally related to non-interferometric phase measurements of an optical signal. The various described techniques may be applied to methods, systems, devices or combinations thereof. Some methods for determining phase data of the optical signal may include transmitting the optical signal through a first optical element and obtaining first intensity data at a first focal plane of the first optical element by an optical sensor. Example methods may also include transmitting the optical signal through a second optical element. The second optical element may include a phase transformation mask. Example methods may further include obtaining a second intensity data at a second focal plane of the second optical element by the optical sensor and determining the phase data for the optical signal based on the first intensity data and the second intensity data.
Indian Institute of Technology Delhi | Date: 2015-10-20
Diversity combining schemes have been extensively used in wireless and free space optical communication systems. The present invention of a system and method for free space optical communications where multiple gain combiner (MGC) provides a better performance as compared to selection combining (SC) and equal gain combining (EGC) and can also be used for wireless applications. It also gives a cost effective solution with a minimal degradation in quality when maximal ratio combining (MRC) is compared in terms of hardware complexity and implementation cost. There is no need for present channel state information. Also, Adaptive weight adjustment is not required in present invention. Therefore, the MGC of system and method disclosed in the present invention is a simple, cost effective and high performance diversity combiner.
Veerachary M.,Indian Institute of Technology Delhi
IEEE Transactions on Industrial Electronics | Year: 2012
A two-loop digital control strategy is proposed for load distribution on a two-input integrated buck-SEPIC converter-based dc-dc power conversion system. The proposed control strategy involves two decoupled control loops: one for low-voltage source (LVS) current control and the other for dc load voltage regulation. A discrete-time model of the proposed converter is established, and then, the relative gain array theory (RGA) of multi-input-multi-output control systems is applied to establish feasible combinations of input and output quantities, as well as control and power distribution quantities, for achieving optimal load allocation to input sources. The computed RGA number for diagonal pairing is close to one, for most of the frequencies of interest, indicating the optimal choice of controlling load voltage "v o" with duty ratio d 1 and LVS current "i g" with duty ratio "d 2." Digital voltage- and current-mode controllers are designed using discrete-time z-transfer functions. The closed-loop integrated converter performance is verified as matching the theoretical predictions. The experimental measurements are in agreement with the analytical results, thus validating the proposed digital load distribution control concept. © 2011 IEEE.
Bhatnagar M.R.,Indian Institute of Technology Delhi
IEEE Transactions on Vehicular Technology | Year: 2012
In this paper, we derive a maximum-likelihood (ML) decoder of the differential data in a decode-and-forward (DF)-based cooperative communication system utilizing uncoded transmissions. This decoder is applicable to complex-valued unitary and nonunitary constellations suitable for differential modulation. The ML decoder helps to improve the diversity of the DF-based differential cooperative system using an erroneous relaying node. We also derive a piecewise linear (PL) decoder of the differential data transmitted in the DF-based cooperative system. The proposed PL decoder significantly reduces the decoding complexity, as compared with the proposed ML decoder, with no significant degradation in the receiver performance. Existing ML and PL decoders of the differentially modulated uncoded data in the DF-based cooperative communication system are only applicable to binary modulated signals like binary phase shift keying and binary frequency shift keying, whereas the proposed decoders are applicable to complex-valued unitary and nonunitary constellations suitable for differential modulation under uncoded transmissions. We derive a closed-form expression of the uncoded average symbol error rate (SER) of the proposed PL decoder with M phase-shift keying constellation in a cooperative communication system with a single relay and one source-destination pair. An approximate average SER by ignoring higher order noise terms is also derived for this setup. It is analytically shown on the basis of the derived approximate SER that the proposed PL decoder provides full diversity of second order. In addition, we also derive the approximate SER of the differential DF system with multiple relays at asymptotically high signal-to-noise ratio (SNR) of the source-relay links. It is shown by simulations that the proposed PL decoder in the differential DF cooperative system with more than one relay also achieves the maximum possible diversity. © 2011 IEEE.