The fertility of the coastal and estuarine waters is of great concern because of its influence on the
productivity of these waters. Seasonal variations in the distribution of organic carbon, total nitrogen and
total phosphorus in the sediments of Kuttanad Waters, a part of the tropical Cochin Estuary on the south
west coast of India, are examined to identify the contribution of sediments to the fertility of the
aquatic systems. The adjoining region has considerable agricultural activity. The fresh water zones had
higher quantities of silt and clay whereas the estuarine zone was more sandy. Organic carbon, total
phosphorus and total nitrogen were higher in the fresh water zones and lower in the estuarine zones.
Total phosphorus and organic carbon showed the lowest values during monsoon periods. No significant
trends were observed in the seasonal distributions of total nitrogen.
Ratios of C/N, C/P and N/P, and the phosphorus and nitrogen content indicate significant modification
in the character of the organic matter. Substantial amounts of the organic matter can contribute to
reducing conditions and modify diagenetic processes
Gijo,Augustin; Shynu, S V; Mohanan, P; Aanandan,C K; Vasudevan, K(John Wiley & Sons, November , 2006)
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Abstract:
A novel fixed frequency beam scanning microstrip leaky wave antenna is reported. The beam scanning at fixed frequency is achieved by reactive loading. Simulation and measured results shows frequency scanability of 80° as well as fixed frequency beam steering of 68° over the −10 dB impedance band of 4.56–5.06 GHz.
Deepa, Nair G; Jagadish, K S; Alex, Fraaij(Elsevier, March , 2006)
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Abstract:
This paper discusses the properties of rice husk ash samples produced from different types of field ovens to compare the performance of the
ovens and to identify the most feasible method to produce a reactive pozzolana as an alternative to cement for building applications requiring
lower strengths. Different types of ashes are produced and long-term strength of rice husk ash pozzolanas with lime or cement is investigated to
suggest a sustainable affordable option in rural building applications, especially for rural housing in Kerala, a southern state of India
Manoj, P K; Nasar, K K(Ss International Research Network, March , 2013)
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Abstract:
This study examines the behavioral factors that influence the Indian Investors to invest in the Real Estate Market. Among the various factors that affect the tendency of investors to invest in the real market, certain factors are greatly influenced the investors at greatest extend while others at least level. From this study it is revealed that motivation from the real estate developers and brokers (mean value- 3.46) is most influencing factor and happening of uncertain events (mean value- 1.75) is the least factor that influences the investors’ investment behavior. In this study, the behavioral factor like over confidence and the hypotheses regarding education, religion were analyzed and found that religious factor influences the Indian investors to invest in the real estate
Supriya, M H; Dr.Pillai, P R S(Cochin University of Science & Technology, October , 2007)
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Abstract:
This thesis addresses one of the emerging topics in Sonar Signal Processing.,viz.the implementation of a target classifier for the noise sources in the ocean, as the operator assisted classification turns out to be tedious,laborious and time consuming.In the work reported in this thesis,various judiciously chosen components of the feature vector are used for realizing the newly proposed Hierarchical Target Trimming Model.The performance of the proposed classifier has been compared with the Euclidean distance and Fuzzy K-Nearest Neighbour Model classifiers and is found to have better success rates.The procedures for generating the Target Feature Record or the Feature vector from the spectral,cepstral and bispectral features have also been suggested.The Feature vector ,so generated from the noise data waveform is compared with the feature vectors available in the knowledge base and the most matching pattern is identified,for the purpose of target classification.In an attempt to improve the success rate of the Feature Vector based classifier,the proposed system has been augmented with the HMM based Classifier.Institutions where both the classifier decisions disagree,a contention resolving mechanism built around the DUET algorithm has been suggested.
Description:
Departement of Electronics,Cochin University of Science and Technology
James, Kurian; Saseendran Pillai, P R(December 8, 2008)
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Abstract:
This paper introduces a simple and efficient method
and its implementation in an FPGA for reducing the odometric
localization errors caused by over count readings of an
optical encoder based odometric system in a mobile robot
due to wheel-slippage and terrain irregularities. The detection
and correction is based on redundant encoder measurements.
The method suggested relies on the fact that the
wheel slippage or terrain irregularities cause more count
readings from the encoder than what corresponds to the
actual distance travelled by the vehicle. The standard quadrature
technique is used to obtain four counts in each encoder
period. In this work a three-wheeled mobile robot
vehicle with one driving-steering wheel and two-fixed rear
wheels in-axis, fitted with incremental optical encoders is
considered. The CORDIC algorithm has been used for the
computation of sine and cosine terms in the update equations.
The results presented demonstrate the effectiveness
of the technique
Description:
Journal of Automation, Mobile Robotics & Intelligent Systems VOLUME 3, No 3 2009
Raghu, O; Dr. Jacob, Philip(Cochin University of Science and Technology, February , 2007)
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Abstract:
Among the large number of photothcrmal techniques available, photoacoustics
assumes a very significant place because of its essential simplicity and the variety of
applications it finds in science and technology. The photoacoustic (PA) effect is the
generation of an acoustic signal when a sample, kept inside an enclosed volume, is
irradiated by an intensity modulated beam of radiation. The radiation absorbed by the
sample is converted into thermal waves by nonradiative de-excitation processes. The
propagating thermal waves cause a corresponding expansion and contraction of the
gas medium surrounding the sample, which in tum can be detected as sound waves by
a sensitive microphone. These sound waves have the same frequency as the initial
modulation frequency of light. Lock-in detection method enables one to have a
sufficiently high signal to noise ratio for the detected signal. The PA signal amplitude
depends on the optical absorption coefficient of the sample and its thermal properties.
The PA signal phase is a function of the thermal diffusivity of the sample.Measurement of the PA amplitude and phase enables one to get valuable information
about the thermal and optical properties of the sample.
Since the PA signal depends on the optical and thennal properties of the
sample, their variation will get reflected in the PA signal. Therefore, if the PA signal
is collected from various points on a sample surface it will give a profile of the
variations in the optical/thennal properties across the sample surface. Since the optical
and thermal properties are affected by the presence of defects, interfaces, change of
material etc. these will get reflected in the PA signal. By varying the modulation
frequency, we can get information about the subsurface features also. This is the basic
principle of PA imaging or PA depth profiling. It is a quickly expanding field with
potential applications in thin film technology, chemical engineering, biology, medical
diagnosis etc. Since it is a non-destructive method, PA imaging has added advantages
over some of the other imaging techniques. A major part of the work presented in this
thesis is concemed with the development of a PA imaging setup that can be used to
detect the presence of surface and subsmface defects in solid samples.Determination of thermal transport properties such as thermal diffusivity,
effusivity, conductivity and heat capacity of materials is another application of
photothennal effect. There are various methods, depending on the nature of the
sample, to determine these properties. However, there are only a few methods
developed to determine all these properties simultaneously. Even though a few
techniques to determine the above thermal properties individually for a coating can be
found in literature, no technique is available for the simultaneous measurement of
these parameters for a coating. We have developed a scanning photoacoustic technique that can be used to determine all the above thermal transport properties
simultaneously in the case of opaque coatings such as paints. Another work that we
have presented in this thesis is the determination of thermal effusivity of many bulk
solids by a scanning photoacoustic technique. This is one of the very few methods
developed to determine thermal effiisivity directly.
Description:
Dept.of Instrumentation,Cochin University of Science and Technology
Achamma, Kurian; Unnikrishnan, K P; Thomas Lee, S; Nampoori, V P N; Vallabhan, C P G(Taylor & Francis, 2002)
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Abstract:
A sensitive method based on the principle of photothermal phenomena to realize optical
logic gates is presented. A dual beam thermal lens method using low power cw lasers in a
dye-doped polymer can be very effectively used as an alternate technique to perform the
logical function such as NAND, AND and OR.
Harikrishnan, K; Dr.George, Varghese K(Cochin University of Science and Technology, July 30, 2008)
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Abstract:
In the absence of entry barrier or regulatory restrictions, Non Banking Financial
Companies frantically grew and accessed the public deposit without any
regulatory control. The deposit of NBFCs grew from Rs. 41.9 crore in 1971 to
53116.0 crore in 1997. This growth was the result of a combined effect of
increase in the number of NBFCs and increase in the amount of deposits. The
deposits amazed as above was invested in various assets especially that in
motor vehicles by these asset financing NBFCs. Various tactics were adopted
by these NBFCs and their agents for recovering the receivable outstanding from
such assets. Both central government and RBI were concerned about the
protection of depositors‘ interest and various committees were set up to frame a
comprehensive regulation for the functioning of these NBFCs.
Description:
School of Management Studies, Cochin University
of Science and Technology
The greatest damage inflicted by the recent recession has not necessarily been financial but emotional and psychological. There are a lot of direct and indirect societal challenges ,changes and oppurtunuties that were brought by recession everywhere including in India. In this paper an attempt is made to analyse such societal changes challenges and oppurtunities.
Shynu, S V; Gijo,Augustin; Aanandan,C K; Mohanan, P; Vasudevan, K(Microwave and Optical Technology Letters, February 4, 2005)
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Abstract:
A novel reconfigurable, single feed, dual frequency, dualpolarized
operation of a hexagonal slot-loaded square mwrostrip antenna
is presented in this paper. A pin diode incorporated in the slot is
used to switch the two operating frequencies considerably, without significantly
affecting the radiation characteristics and gain. The proposed
antenna provides a size reduction up to 61% and 26% Jor the two resonating
frequencies, compared to standard rectangular patches. This design
also gives considerable bandwidth up to 3.3% and 4.27%, for the two
frequencies with a low operating frequency ratio
Vineetha, S; Dr.Sumam Mary,Idicula(Cochin University Of Science And Technology, October , 2012)
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Abstract:
Microarray data analysis is one of data mining tool which is used to
extract meaningful information hidden in biological data. One of the major
focuses on microarray data analysis is the reconstruction of gene regulatory
network that may be used to provide a broader understanding on the
functioning of complex cellular systems. Since cancer is a genetic disease
arising from the abnormal gene function, the identification of cancerous genes
and the regulatory pathways they control will provide a better platform for
understanding the tumor formation and development. The major focus of this
thesis is to understand the regulation of genes responsible for the development
of cancer, particularly colorectal cancer by analyzing the microarray
expression data.
In this thesis, four computational algorithms namely fuzzy logic
algorithm, modified genetic algorithm, dynamic neural fuzzy network and
Takagi Sugeno Kang-type recurrent neural fuzzy network are used to
extract cancer specific gene regulatory network from plasma RNA dataset
of colorectal cancer patients. Plasma RNA is highly attractive for cancer
analysis since it requires a collection of small amount of blood and it can be
obtained at any time in repetitive fashion allowing the analysis of disease
progression and treatment response.
Description:
Department of
Computer Science, Cochin University of Science and Technology
Sreekumar, K; Rani, Joseph; Pramitha, V; Sudha Kartha, C(Indian Academy of Sciences, December , 2010)
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Abstract:
Plane-wave transmission gratings were stored in the same location of silver-
doped photopolymer ¯lm using peristrophic multiplexing techniques. Constant and vari-
able exposure scheduling methods were adopted for storing gratings in the ¯lm using
He{Ne laser (632.8 nm). The role of recording geometry on the dynamic range of the ma-
terial was studied by comparing the results obtained from both techniques. Peristrophic
multiplexing with rotation of the ¯lm in a plane normal to the bisector of the incident
beams resulted in better homogenization of di®raction e±ciencies and larger M/# value.
Chandrasekharan Pillai,N; Dr.Parameswaran, Nair N(Cochin University of Science and Technology, March , 1983)
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Abstract:
Public undertakings have been assigned a significant role to play in the systematic socio-economic development of India. My interest in the subject was kindled while I was doing my Masters Diploma in Public Administration at the Indian Institute of Public Administration, New Delhi during 1960-61. It was further strengthened by my teaching of the subject in different courses offered by me at the School of Management Studies and in several programmes organised by various voluntary and training organisations like the Institute of Management in Government, Trivandrum, Centre for Management Development, Trivandrum, etc. The several years in which I served as a member of the faculty in the School of Management Studies, University of Cochin,gave me the opportunity to come into close contact with different public sector concerns and their managers at various levels. This rich opportunity gave me a better insight into the problems faced by these concerns. The present study is a result of the interest so developed.
Description:
School of management studies, Cochin University of Science and Technology
Mridula, S; Binu, Paul; Mohanan, P; Bijumon, P V; Sebastian,M T(URSI, October , 2005)
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Abstract:
Experimental investigations on Microstrip line excited Dielectric Resonator Antenna configurations suitable for Mobile Communication applications are reported. High permittivity (εrd = 48) resonator samples with different aspect ratios are employed for the study. Theoretical analysis performed using FDTD method is also presented.