Hari, V S; Dr. Jagathy Raj, V P; Dr.Gopikakumari, R(Cochin University of Science And Technology, June , 2013)
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Abstract:
The basic concepts of digital signal processing are taught to the students
in engineering and science. The focus of the course is on linear,
time invariant systems. The question as to what happens when the
system is governed by a quadratic or cubic equation remains unanswered
in the vast majority of literature on signal processing. Light has
been shed on this problem when John V Mathews and Giovanni L Sicuranza
published the book Polynomial Signal Processing. This book
opened up an unseen vista of polynomial systems for signal and image
processing. The book presented the theory and implementations
of both adaptive and non-adaptive FIR and IIR quadratic systems
which offer improved performance than conventional linear systems.
The theory of quadratic systems presents a pristine and virgin area of
research that offers computationally intensive work. Once the area of
research is selected, the next issue is the choice of the software tool to
carry out the work. Conventional languages like C and C++ are easily
eliminated as they are not interpreted and lack good quality plotting
libraries. MATLAB is proved to be very slow and so do SCILAB and
Octave. The search for a language for scientific computing that was
as fast as C, but with a good quality plotting library, ended up in
Python, a distant relative of LISP. It proved to be ideal for scientific
computing. An account of the use of Python, its scientific computing
package scipy and the plotting library pylab is given in the appendix Initially, work is focused on designing predictors that exploit the polynomial
nonlinearities inherent in speech generation mechanisms. Soon,
the work got diverted into medical image processing which offered
more potential to exploit by the use of quadratic methods. The major
focus in this area is on quadratic edge detection methods for retinal
images and fingerprints as well as de-noising raw MRI signals
Description:
School of Engineering
Cochin University of Science and Technology
Thomas Lee, S; Dr.Nampoori,V P N; Dr. Radhakrishnan, P(Cochin University of Science & Technology, May , 2003)
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Abstract:
Advent of lasers together with the advancement in fiber optics technology has revolutionized the sensor technology. Advancement in the telemetric applications of optical fiber based measurements is an added bonus. The present thesis describes variety of fiber based sensors using techniques like micro bending, long period grating and evanescent waves. Sensors to measure various physical and chemical parameters are described in this thesis.
Description:
International School of Photonics,
Cochin University of Science and Technology
Geetha, K; Radhakrishnan, P(International School of Photonics, June , 2006)
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Abstract:
The rapid developments in fields such as fibre optic communication
engineering and integrated optical electronics have expanded the interest and
have increased the expectations about guided wave optics, in which optical
waveguides and optical fibres play a central role. The technology of guided
wave photonics now plays a role in generating information (guided-wave
sensors) and processing information (spectral analysis, analog-to-digital
conversion and other optical communication schemes) in addition to its
original application of transmitting information (fibre optic communication).
Passive and active polymer devices have generated much research
interest recently because of the versatility of the fabrication techniques and
the potential applications in two important areas – short distant
communication network and special functionality optical devices such as
amplifiers, switches and sensors. Polymer optical waveguides and fibres are
often designed to have large cores with 10-1000 micrometer diameter to
facilitate easy connection and splicing.
Large diameter polymer optical fibres being less fragile and vastly
easier to work with than glass fibres, are attractive in sensing applications.
Sensors using commercial plastic optical fibres are based on ideas already
used in silica glass sensors, but exploiting the flexible and cost effective
nature of the plastic optical fibre for harsh environments and throw-away
sensors.
In the field of Photonics, considerable attention is centering on the
use of polymer waveguides and fibres, as they have a great potential to create
all-optical devices. By attaching organic dyes to the polymer system we can
incorporate a variety of optical functions. Organic dye doped polymer
waveguides and fibres are potential candidates for solid state gain media.
High power and high gain optical amplification in organic dye-doped
polymer waveguide amplifier is possible due to extremely large emission
cross sections of dyes. Also, an extensive choice of organic dye dopants is
possible resulting in amplification covering a wide range in the visible region.
Jayaprakash, P; Dr. Menon, A K(Cochin University of Science And Technology, March 15, 1999)
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Abstract:
A GIS has been designed with limited Functionalities; but with a novel approach in
Aits design. The spatial data model adopted in the design of KBGIS is the unlinked
vector model. Each map entity is encoded separately in vector fonn, without referencing
any of its neighbouring entities. Spatial relations, in other words, are not encoded. This
approach is adequate for routine analysis of geographic data represented on a planar map,
and their display (Pages 105-106). Even though spatial relations are not encoded
explicitly, they can be extracted through the specially designed queries.
This work was undertaken as an experiment to study the feasibility of developing a
GIS using a knowledge base in place of a relational database. The source of input spatial
data was accurate sheet maps that were manually digitised. Each identifiable geographic
primitive was represented as a distinct object, with its spatial properties and attributes
defined. Composite spatial objects, made up of primitive objects, were formulated, based
on production rules defining such compositions. The facts and rules were then organised
into a production system, using OPS5
Description:
Department of Computer Science
School of Computer Science Studies
Cochin University of Science and Technology
Prakash,P N; Dr.Ramaiah,D(National Institute for Interdisciplinary Science and Technology,CSIR, December , 2008)
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Abstract:
Development of organic molecules that exhibit selective
interactions with different biomolecules has immense significance
in biochemical and medicinal applications. In this context, our main
objective has been to design a few novel functionaIized molecules
that can selectively bind and recognize nucleotides and DNA in the aqueous medium through non-covalent interactions. Our strategy
was to design novel cycIophane receptor systems based on the
anthracene chromophore linked through different bridging moieties
and spacer groups. It was proposed that such systems would have a
rigid structure with well defined cavity, wherein the aromatic
chromophore can undergo pi-stacking interactions with the guest
molecules. The viologen and imidazolium moieties have been
chosen as bridging units, since such groups, can in principle, could
enhance the solubility of these derivatives in the aqueous medium
as well as stabilize the inclusion complexes through electrostatic
interactions.We synthesized a series of water soluble novel functionalized
cyclophanes and have investigated their interactions with
nucleotides, DNA and oligonucIeotides through photophysical.
chiroptical, electrochemical and NMR techniques. Results indicate
that these systems have favorable photophysical properties and
exhibit selective interactions with ATP, GTP and DNA involving
electrostatic. hydrophobic and pi-stacking interactions inside the
cavity and hence can have potential use as probes in biology.
Akhil, K Nair; Dr.Ramaiah,D(Cochin University Of Science And Technology, October 3, 2013)
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Abstract:
Design and study of molecular receptors capable of mimicking
natural processes has found applications in basic research as well as in
the development of potentially useful technologies. Of the various
receptors reported, the cyclophanes are known to encapsulate guest
molecules in their cavity utilizing various non–covalent interactions
resulting in significant changes in their optical properties. This unique
property of the cyclophanes has been widely exploited for the
development of selective and sensitive probes for a variety of guest
molecules including complex biomolecules. Further, the incorporation of
metal centres into these systems added new possibilities for designing
receptors such as the metallocyclophanes and transition metal
complexes, which can target a large variety of Lewis basic functional
groups that act as selective synthetic receptors.
The ligands that form complexes with the metal ions, and are
capable of further binding to Lewis-basic substrates through open
coordination sites present in various biomolecules are particularly
important as biomolecular receptors. In this context, we synthesized a
few anthracene and acridine based metal complexes and novel
metallocyclophanes and have investigated their photophysical and
biomolecular recognition properties.
Description:
Photosciences and Photonics
Chemical Sciences and Technology Division
CSIR-National Institute for Interdisciplinary Science and
Technology (CSIR-NIIST), Trivandrum
Babita Roslind, Jose; Dr.Mythili, P(Cochin University of Science & Technology, January , 2010)
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Abstract:
Analog-to digital Converters (ADC) have an important impact on the overall performance of signal processing system. This research is to explore efficient techniques for the design of sigma-delta ADC,specially for multi-standard wireless tranceivers. In particular, the aim is to develop novel models and algorithms to address this problem and to implement software tools which are avle to assist the designer's decisions in the system-level exploration phase. To this end, this thesis presents a framework of techniques to design sigma-delta analog to digital converters.A2-2-2 reconfigurable sigma-delta modulator is proposed which can meet the design specifications of the three wireless communication standards namely GSM,WCDMA and WLAN. A sigma-delta modulator design tool is developed using the Graphical User Interface Development Environment (GUIDE) In MATLAB.Genetic Algorithm(GA) based search method is introduced to find the optimum value of the scaling coefficients and to maximize the dynamic range in a sigma-delta modulator.
Description:
School of Engineering, Cochin University of Science and Technology
Sunil, Thomas; Dr.Balasundaran, M(Cochin University of Science And Technology, June , 2000)
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Abstract:
Spike disease in sandal is generally diagnosed by the manifestation of
external symptoms. Attempts have been made to detect the diseased plants
by determining the length/breadth ratio of leaves (lyengar, 1961) and
histochemical tests using Mann's stain (Parthasarathi et al., 1966), Dienes'
stain (Ananthapadmanabha et a/., 1973) aniline blue and Hoechst 33258
(Ghosh et a/., 1985, Rangaswamy, 1995). But most of these techniques are
insensitive, indirect detection methods leading to misinterpretation of results.
Moreover, to identify disease resistant sandal trees, highly sensitive
techniques are needed to detect the presence of the pathogen. In sandal
forests, several host plants of sandal like Zizyphus oenop/ea (Fig. 1.3) also
exhibit the yellows type disease symptoms. Immunological and molecular
assays have to be developed to confirm the presence of sandal spike
phytoplasma in such hosts. The major objectives of the present work
includes:In situ detection of sandal spike phytoplasma by epifluorescence
microscopy and scanning electron microscopy.,Purification of sandal spike phytoplasma and production of polyclonal antibodies.,Amino acid and total protein estimation of sandal spike phytoplasma.,Immunological detection of sandal spike phytoplasma.,
Molecular detection of sandal spike phytoplasma.,Screening for phytoplasma in host plants of spike disease affected sandal using immunological and molecular techniques.
Description:
Department of environmental studies, Cochin University of Science And Technology
Thomas, Varghese; Dr.Moli,P Koshy(Cochin University Of Science And Technology, April , 2013)
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Abstract:
This research work was to study the level of awareness of consumers
about health insurance concept and market, consumer perceptions about
health insurance providers, schemes and various factors that influence
buying decision of health insurance.
There is need to bring entire age group – high risk and low risk under
health insurance cover. Widening the cover of health insurance calls for indepth
understanding of consumer thinking and extensive marketing efforts
based on that. Hence the study of consumer perceptions and the impact of
different contributing factors on consumer purchase decision assume
significance to the marketer. Understanding the consumer thinking on
health insurance will also be of relevance to governmental/non
governmental agencies, as affordable health care to all is a policy objective
of the government and new schemes are being launched in this area.
Description:
School of Management Studies
Cochin University of Science and Technology