Dinesh Kumar, V P; Dr. Tessamma, Thomas(Cochin University of Science and Technology, April , 2008)
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Abstract:
The wealth of information available freely on the web and medical image databases poses a major problem for the end users: how to find the information needed? Content –Based Image Retrieval is the obvious solution.A standard called MPEG-7 was evolved to address the interoperability issues of content-based search.The work presented in this thesis mainly concentrates on developing new shape descriptors and a framework for content – based retrieval of scoliosis images.New region-based and contour based shape descriptor is developed based on orthogonal Legendre polymomials.A novel system for indexing and retrieval of digital spine radiographs with scoliosis is presented.
Description:
Department of Electronics,
Cochin University of Science and Technology
Sreekumar, A; Dr.Vijayakumar, K P(Cochin University of Science And Technology, November , 2007)
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Abstract:
In the present work, the author has designed and developed all types of solar
air heaters called porous and nonporous collectors. The developed solar air
heaters were subjected to different air mass flow rates in order to standardize
the flow per unit area of the collector. Much attention was given to
investigate the performance of the solar air heaters fitted with baffles. The
output obtained from the experiments on pilot models, helped the installation
of solar air heating system for industrial drying applications also. Apart from
these, various types of solar dryers, for small and medium scale drying
applications, were also built up. The feasibility of ‘latent heat thermal energy
storage system’ based on Phase Change Material was also undertaken. The
application of solar greenhouse for drying industrial effluent was analyzed in
the present study and a solar greenhouse was developed. The effectiveness
of Computational Fluid Dynamics (CFD) in the field of solar air heaters was
also analyzed. The thesis is divided into eight chapters.
Description:
Department of Physics, Cochin University of Science and Technology
Ananda Resmi, S; Dr. Tessamma, Thomas(Cochin University of Science And Technology, August 12, 2013)
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Abstract:
Cerebral glioma is the most prevalent primary brain tumor, which are
classified broadly into low and high grades according to the degree of malignancy.
High grade gliomas are highly malignant which possess a poor prognosis, and the
patients survive less than eighteen months after diagnosis. Low grade gliomas are
slow growing, least malignant and has better response to therapy. To date,
histological grading is used as the standard technique for diagnosis, treatment
planning and survival prediction.
The main objective of this thesis is to propose novel methods for automatic
extraction of low and high grade glioma and other brain tissues, grade detection
techniques for glioma using conventional magnetic resonance imaging (MRI)
modalities and 3D modelling of glioma from segmented tumor slices in order to
assess the growth rate of tumors. Two new methods are developed for extracting
tumor regions, of which the second method, named as Adaptive Gray level
Algebraic set Segmentation Algorithm (AGASA) can also extract white matter and
grey matter from T1 FLAIR an T2 weighted images. The methods were validated
with manual Ground truth images, which showed promising results. The developed
methods were compared with widely used Fuzzy c-means clustering technique and
the robustness of the algorithm with respect to noise is also checked for different
noise levels. Image texture can provide significant information on the
(ab)normality of tissue, and this thesis expands this idea to tumour texture grading
and detection. Based on the thresholds of discriminant first order and gray level cooccurrence
matrix based second order statistical features three feature sets were
formulated and a decision system was developed for grade detection of glioma
from conventional T2 weighted MRI modality.The quantitative performance
analysis using ROC curve showed 99.03% accuracy for distinguishing between
advanced (aggressive) and early stage (non-aggressive) malignant glioma. The
developed brain texture analysis techniques can improve the physician’s ability to
detect and analyse pathologies leading to a more reliable diagnosis and treatment of
disease. The segmented tumors were also used for volumetric modelling of tumors
which can provide an idea of the growth rate of tumor; this can be used for
assessing response to therapy and patient prognosis.
Description:
Department of Electronics
Cochin University of Science and Technology
Lakshmi,K; Dr.George, K E; Dr.Mathew, K T(Cochin University of Science & Technology, September , 2007)
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Abstract:
The microwave and electrical applications of some important conducting polymers are analyzed in this investigation.One of the major drawbacks of conducting polymers is their poor processability,and a solution to overcome this is sought in this investigation.Conducting polymer thermoplastic composites were prepared by the insitu polymerization method to improve the extent of miscibility probably to a semi IPN level.The attractive features of the conducting composite developed are excellent processability,good microwave and electrical conductivity,good microwave absorption,load sensitivity and satisfactory mechanical properties.The composite shows typical frequency selective microwave absorption and refelection behaviors.
Description:
Department of Polymer science and Rubber Technology ,Cochin University of Science and Technology
Roshen, Jacob; Dr.Unnikrishnan, A; Dr. Tessamma, Thomas(Naval Physical and Oceanographic Laboratory, November , 2010)
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Abstract:
Sonar signal processing comprises of a large number of signal processing algorithms
for implementing functions such as Target Detection, Localisation, Classification, Tracking
and Parameter estimation. Current implementations of these functions rely on conventional
techniques largely based on Fourier Techniques, primarily meant for stationary signals.
Interestingly enough, the signals received by the sonar sensors are often non-stationary and
hence processing methods capable of handling the non-stationarity will definitely fare better
than Fourier transform based methods.Time-frequency methods(TFMs) are known as one of the best DSP tools for nonstationary
signal processing, with which one can analyze signals in time and frequency
domains simultaneously. But, other than STFT, TFMs have been largely limited to academic
research because of the complexity of the algorithms and the limitations of computing power.
With the availability of fast processors, many applications of TFMs have been reported in the
fields of speech and image processing and biomedical applications, but not many in sonar
processing. A structured effort, to fill these lacunae by exploring the potential of TFMs in
sonar applications, is the net outcome of this thesis. To this end, four TFMs have been
explored in detail viz. Wavelet Transform, Fractional Fourier Transfonn, Wigner Ville
Distribution and Ambiguity Function and their potential in implementing five major sonar
functions has been demonstrated with very promising results. What has been conclusively
brought out in this thesis, is that there is no "one best TFM" for all applications, but there is
"one best TFM" for each application. Accordingly, the TFM has to be adapted and tailored
in many ways in order to develop specific algorithms for each of the applications.
Shassi, S; Dr.Ramachandran,A(Cochin University of Science and Technology, October , 1998)
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Abstract:
Quality related problems have become dominant in the seafood processing industry in Kerala. This has resulted in the rejection of seafood sent from India to many destinations. The latest being the total block listing of seafood companies from India from being exported to Europe and partial block listing by the US. The quality systems prevailed in the seafood industry in India were outdated and no longer in use in the developed world. According to EC Directive discussed above all the seafood factories exporting to European countries have to adopt HACCP. Based on this, EIA has now made HACCP system mandatory in all the seafood processing factories in India. This transformation from a traditional product based inspection system to a process control system requires thorough changes in the various stages of production and quality management. This study is conducted by the author with to study the status of the existing infrastructure and quality control system in the seafood industry in Kerala with reference to the recent developments in the quality concepts in international markets and study the drawbacks, if any, of the existing quality management systems in force in the seafood factories in Kerala for introducing the mandatory HACCP concept. To assess the possibilities of introducing Total Quality Management system in the seafood industry in Kerala in order to effectively adopt the HACCP concept. This is also aimed at improving the quality of the products and productivity of the industry by sustaining the world markets in the long run.
Description:
School of Industrial Fisheries, Cochin University of Science and Technology
Haseeb, M; Dr.Bright Singh,I S(Cochin University Of Science And Technology, November , 2012)
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Abstract:
Aquaculture is one of the fastest growing food sectors in the world.
Amongst the various branches of aquaculture, shrimp culture has expanded
rapidly across the globe because of its faster growth rate, short culture period,
high export value and demand in the International market. Indian shrimp
farming has experienced phenomenal development over the decades due to its
excellent commercial viability. Farmers have adopted a number of innovative
technologies to improve the production and to maximize the returns per unit
area. The culture methods adopted can be classified in to extensive, modified
extensive and semi intensive based on the management strategies adopted in
terms of pond size, stocking density, feeding and environmental control. In all
these systems water exchanges through the natural tidal effects, or pump fed
either from creek or from estuaries is a common practice. In all the cases, the
systems are prone to epizootics due to the pathogen introduction through the
incoming water, either brought by vectors, reservoir hosts, infected tissue
debris and free pathogens themselves. In this scenario, measures to prevent the
introduction of pathogen have become a necessity to protect the crop from the
onslaught of diseases as well as to prevent the discharge of waste water in to
the culture environment.The present thesis deals with Standardization of bioremediation technology for zero water exchange shrimp culture system
Description:
School of Environmental Studies,Cochin University of Science and Technology
Kunhaman,M; Dr.Sukumaran Nair, M K(Cochin University of Science and Technology, April 5, 1990)
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Abstract:
This thesis entitled “Development planning at the state level in india a case study with reference to kerala1957-84.Planning in India is a concurrent subject with the Centre and the States having well-defined domains of jurisdiction with regard to planning functions and sources of resource mobilisation.The genesis of the lack of academic interest in state level planning is in the widely held belief that in the extent scheme of Centre-State economic relations, the states have little scope for initiative in planning.Both at the theoretical and empirical levels, Kerala has attached very great importance to planning.It has been the localeof wide and deep discussions on the various dimensions of planning.In Kerala's development process, the leading sector consists of social services such as education and public healthOne point that needs special emphasis in this regard is that the high demand for education in Kerala cannot be attributed to the Keralites' ‘unique urge‘ for education. Rather, it is related to the very high level of unemployment in the state (Kerala has the highest level of unemployment in the country.In resource allocation under the Five Year Plans, Kerala attached the highest weightage to power generation, hydro-electric projects being the major source of power in the state. Nearly one-fourth of the plan resources has been claimed by hydro-electric projects.In the agricultural sector, Kera1a's level of productive use of electric power is one of the lowest.As is evident.from above, planning in Kerala has not enabled us to solve the basic problems of the state. More 'scientific' planning in the sense of applying mre sophisticated planning techniques is obviously not the answer. It, on the contrary, consists of more fundamental changes some of which can be brought about through an effective use of measures well within the power of the State Government.
Description:
Department of Applied Economics, Cochin
University of Science and Technology
Mathiazhagan, A; Rani, Joseph; Narayanan, K P(IACSIT Press, August , 2010)
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Abstract:
Inhibited α brasses are largely immune to
dezincification in most water, but the effect of tin and arsenic
addition to α/β brasses is not so reliable or predictable in
controlling the problem. There have been many cases of
dezincification in duplex brasses in both fresh water and
seawater. There is no reliable method of inhibiting the
dezincification of two-phase brass despite there are some
protection methods such as inhibitors, electro deposition and
electro polymerization. Organic coatings are effectively used for
the protection of metals due to their capacity to act as a physical
barrier between the metal surface and corrosive environment.
Hence, epoxy coating on brass was applied and effect of this
against dezincification in Cochin estuarine water over a period
of one year was studied and reported in this paper
Description:
International Journal of Chemical Engineering and Applications, Vol. 1, No. 2, August 2010
Sumam, Mary Idicula; Mohanty, U C; Litta, A J(Indian Academy of Sciences, April , 2012)
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Abstract:
Thunderstorm, resulting from vigorous convective activity, is one of the most spectacular weather phenomena
in the atmosphere. A common feature of the weather during the pre-monsoon season over the
Indo-Gangetic Plain and northeast India is the outburst of severe local convective storms, commonly
known as ‘Nor’westers’(as they move from northwest to southeast). The severe thunderstorms associated
with thunder, squall lines, lightning and hail cause extensive losses in agricultural, damage to structure
and also loss of life. In this paper, sensitivity experiments have been conducted with the Non-hydrostatic
Mesoscale Model (NMM) to test the impact of three microphysical schemes in capturing the severe thunderstorm
event occurred over Kolkata on 15 May 2009. The results show that the WRF-NMM model
with Ferrier microphysical scheme appears to reproduce the cloud and precipitation processes more realistically
than other schemes. Also, we have made an attempt to diagnose four severe thunderstorms that
occurred during pre-monsoon seasons of 2006, 2007 and 2008 through the simulated radar reflectivity
fields from NMM model with Ferrier microphysics scheme and validated the model results with Kolkata
Doppler Weather Radar (DWR) observations. Composite radar reflectivity simulated by WRF-NMM
model clearly shows the severe thunderstorm movement as observed by DWR imageries, but failed to
capture the intensity as in observations. The results of these analyses demonstrated the capability of
high resolution WRF-NMM model in the simulation of severe thunderstorm events and determined that
the 3 km model improve upon current abilities when it comes to simulating severe thunderstorms over
east Indian region
Description:
J. Earth Syst. Sci. 121, No. 2, April 2012, pp. 297–316
Sooraj,K P; Rajan,C K(Department of Atmospheric Sciences, 2004)
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Abstract:
This study focuses on the onset of southwest monsoon over Kerala. India Meteorological Department (IMD) has been using a semi-objective method to define monsoon onset. The main objectives of the study are to understand the monsoon onset processes, to simulate monsoon onset in a GCM using as input the atmospheric conditions and Sea Surface Temperature, 10 days earlier to the onset, to develop a method for medium range prediction of the date of onset of southwest monsoon over Kerala and to examine the possibility of objectively defining the date of Monsoon Onset over Kerala (MOK). It gives a broad description of regional monsoon systems and monsoon onsets over Asia and Australia. Asian monsoon includes two separate subsystems, Indain monsoon and East Asian monsoon. It is seen from this study that the duration of the different phases of the onset process are dependent on the period of ISO. Based on the study of the monsoon onset process, modeling studies can be done for better understanding of the ocean-atmosphere interaction especially those associated with the warm pool in the Bay of Bengal and the Arabian Sea.
George,K E; Rajan, M; Agarwal, U S; Bally, C; Lemstra, P J(Wiley InterScience, 2005)
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Abstract:
We describe the synthesis of diblock and triblock copolymers by sequential
atom transfer radical polymerization of styrene and acetoxymethylstyrene. Contrary to
the usual block copolymerization involving isolation of the macroinitiator, a convenient
one-pot procedure is developed. This is possible because of the preferential polymerization
of acetoxymethylstyrene, even in the presence of residual styrene, as inferred
from characterization of the intermediate polystyrenes and the block copolymers by size
exclusion chromatography, 1H NMR, Fourier transform infrared spectroscopy, differential
scanning calorimetry, and GPEC techniques. The latent acetoxy functionalities
in these block copolymers are shown to be easily unmasked to OOH and OBr functionalities,
with the potential for block ionomers and dense graft architectures.
Jacob,George; Aanandan,C K; Mohanan, P; K G Nair; Sreemoolanathan,H; Sebastian,M T(Microwave and Optical Technology Letters, February 20, 1998)
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Abstract:
A new method for enhancing the 2.1 VSWR impedance
bandwidth of microstrip antennas is presented. Bandwidth enhancement
is achieved by loading the microstrip antenna by a ceramic microwave
dielectric resonator (DR). The validity of this technique has been established
using rectangular and circular radiating geometries. This method
improves the bandwidth of a rectangular microstrip antenna to more
than 10% (= 5 times that of a conventional rectangular microstrip
antenna) with an enhanced gain of I dB