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
Hatha, A A M; Reema, Singh; Vinay, Narayan; Patricia, McLenachan; Richard, C. Winkworth; Suparna, Mitra; Peter, J. Lockhart; Lorraine, Berry; William, Aalbersberg; Dhana, Rao(Society for Applied Microbiology and Blackwell Publishing Ltd, March 16, 2012)
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Abstract:
Here we investigate the diversity of pathogenic Vibrio
species in marine environments close to Suva, Fiji.
We use four distinct yet complementary analyses –
biochemical testing, phylogenetic analyses, metagenomic
analyses and molecular typing – to provide
some preliminary insights into the diversity of vibrios
in this region. Taken together our analyses confirmed
the presence of nine Vibrio species, including three
of the most important disease-causing vibrios (i.e.
V. cholerae, V. parahaemolyticus and V. vulnificus), in
Fijian marine environments. Furthermore, since toxigenic
V. parahaemolyticus are present on fish for
consumption we suggest these bacteria represent a
potential public health risk. Our results from Illumina
short read sequencing are encouraging in the context
of microbial profiling and biomonitoring. They
suggest this approach may offer an efficient and costeffective
method for studying the dynamics of microbial
diversity in marine environments over time.
Mathew, K T; Anil, Lonappan; Paul, Benzy; Thimothy, V O; Rajasekaran, C; Vinu, Thomas; Joe, Jacob(Wiley InterScience, January , 2009)
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Abstract:
This article reports a new in vitro bile analysis based on
the measurement of the dielectric properties at microwave frequencies.
The measurements were made using rectangular cavity perturbation
technique at the S-band of microwave frequency with the different samples
of bile obtained from healthy persons as well as from patients. It is
observed that an appreciable change in the dielectric properties of patient’s
samples with the normal healthy samples and these measurements
were in good agreement with clinical analysis. These results prove an
alternative in-vitro method of detecting bile abnormalities based on the
measurement of the dielectric properties of bile samples using microwaves
without surgical procedure.
Sumam, Mary Idicula; Geethu, Miriam Jacob(IEEE, 2012)
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Abstract:
In this paper, moving flock patterns are mined from
spatio- temporal datasets by incorporating a clustering
algorithm. A flock is defined as the set of data that
move together for a certain continuous amount of time.
Finding out moving flock patterns using clustering
algorithms is a potential method to find out frequent
patterns of movement in large trajectory datasets. In
this approach, SPatial clusteRing algoRithm thrOugh
sWarm intelligence (SPARROW) is the clustering
algorithm used. The advantage of using SPARROW
algorithm is that it can effectively discover clusters of
widely varying sizes and shapes from large databases.
Variations of the proposed method are addressed and
also the experimental results show that the problem of
scalability and duplicate pattern formation is
addressed. This method also reduces the number of
patterns produced
Description:
2012 International Conference on Data Science & Engineering (ICDSE)
Bagei, A M; Cetin, A E(IEE Electronics letters,UK, October 24, 2002)
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Abstract:
A method for computer- aided diagnosis of micro calcification clusters
in mammograms images presented . Micro calcification clus.eni which
are an early sign of bread cancer appear as isolated bright spots in
mammograms. Therefore they correspond to local maxima of
the image. The local maxima of the image is lint detected and they
are ranked according to it higher-order statistical test performed over
the sub band domain data
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
Chandrasekaran, M; Lailaja, V P(Springer, February 27, 2013)
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Abstract:
Bacillus smithii BTMS 11, isolated from marine
sediment, produced alkaline and thermostable lipase.
The enzyme was purified to homogeneity by ammonium
sulfate precipitation and ion exchange chromatography
which resulted in 0.51 % final yield and a 4.33 fold of
purification. The purified enzyme was found to have a
specific activity of 360 IU/mg protein. SDS-PAGE analyses,
under non-reducing and reducing conditions, yielded a
single band of 45 kDa indicating the single polypeptide
nature of the enzyme and zymogram analysis using methylumbelliferyl
butyrate as substrate confirmed the lipolytic
activity of the protein band. The enzyme was found to have
50 C and pH 8.0 as optimum conditions for maximal
activity. However, the enzyme was active over wide range
of temperatures (30–80 C) and pH (7.0–10.0). Effect of a
number of metal salts, solvents, surfactants, and other
typical enzyme inhibitors on lipase activity was studied to
determine the novel characteristics of the enzyme. More
than 90 % of the enzyme activity was observed even after
3 h of incubation in the presence of commercial detergents
Surf, Sunlight, Ariel, Henko, Tide and Ujala indicating the
detergent compatibility of B. smithii lipase. The enzyme
was also found to be efficient in stain removal from cotton
cloths. Further it was observed that the enzyme could
catalyse ester synthesis between fatty acids of varying
carbon chain lengths and methanol with high preference for
medium to long chain fatty acids showing 70 % of esterification.
Results of the study indicated scope for application
of this marine bacterial lipase in various industries
Description:
World J Microbiol Biotechnol (2013) 29:1349–1360
DOI 10.1007/s11274-013-1298-0
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
Anantharaman, M R; Sajeev, Sivaraman(IOP Publishing LTD, January 21, 2010)
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Abstract:
The carrier transport mechanism of polyaniline (PA) thin films prepared by radio frequency
plasma polymerization is described in this paper. The mechanism of electrical conduction and
carrier mobility of PA thin films for different temperatures were examined using the
aluminium–PA–aluminium (Al–PA–Al) structure. It is found that the mechanism of carrier
transport in these thin films is space charge limited conduction. J –V studies on an asymmetric
electrode configuration using indium tin oxide (ITO) as the base electrode and Al as the upper
electrode (ITO–PA–Al structure) show a diode-like behaviour with a considerable rectification
ratio
Rajasree, K; Radhakrishnan, P; Nampoori, V P N; Vallabhan, C P G(IOP, 1993)
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Abstract:
A pulsed Nd-YAG laser beam is used to produce a transient refractive index gradient in air adjoining the plane surface of the sample material. This refractive index gradient is probed by a continuous He-Ne laser beam propagating parallel to the sample surface. The observed deflection signals produced by the probe beam exhibit drastic variations when the pump laser energy density crosses the damage threshold for the sample. The measurements are used to estimate the damage threshold for a few polymer samples. The present values are found to be in good agreement with those determined by other methods.
Mohammed Yusuff, K K; Sridevi, Nadimpall; Jelaja, Padmavathy(Kluwer Academic Publishers, July 20, 2000)
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Abstract:
The nature of the diperiodatocuprate(III) (DPC) species present in aqueous alkaline medium has been investigated
by a kinetic and mechanistic study on the oxidation of iodide by DPC. The reaction kinetics were studied over the
1.0 ´ 10)3±0.1 mol dm)3 alkali range. The reaction order with respect to DPC, as well as iodide, was found to be
unity when [DPC] [I)]. In the 1.0 ´ 10)3±1.0 ´ 10)2 mol dm)3 alkali region, the rate decreased with increase in
the alkali concentration and a plot of the pseudo-®rst order rate constant, k versus 1/[OH)] was linear. Above
5.0 ´ 10)2 mol dm)3, a plot of k versus [OH)] was also linear with a non-zero intercept. An increase in ionic
strength of the reaction mixtures showed no e ect on k at low alkali concentrations, whereas at high concentrations
an increase in ionic strength leads to an increase in k. A plot of 1/k versus [periodate] was linear with an intercept in
both alkali ranges. Iodine was found to accelerate the reaction at the three di erent alkali concentrations employed.
The observed results indicated the following equilibria for DPC.
Mythili, P; Agnes, Jacob(Hindawi Publishing Corporation, August 28, 2008)
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Abstract:
This paper discusses the implementation details of a child friendly, good quality, English text-to-speech (TTS) system that is
phoneme-based, concatenative, easy to set up and use with little memory. Direct waveform concatenation and linear prediction
coding (LPC) are used. Most existing TTS systems are unit-selection based, which use standard speech databases available in
neutral adult voices.Here reduced memory is achieved by the concatenation of phonemes and by replacing phonetic wave files with
their LPC coefficients. Linguistic analysis was used to reduce the algorithmic complexity instead of signal processing techniques.
Sufficient degree of customization and generalization catering to the needs of the child user had been included through the
provision for vocabulary and voice selection to suit the requisites of the child. Prosody had also been incorporated. This inexpensive
TTS systemwas implemented inMATLAB, with the synthesis presented by means of a graphical user interface (GUI), thus making
it child friendly. This can be used not only as an interesting language learning aid for the normal child but it also serves as a speech
aid to the vocally disabled child. The quality of the synthesized speech was evaluated using the mean opinion score (MOS).
Description:
Advances in Human-Computer Interaction
Volume 2008, Article ID 597971, 6 pages
The tough competition in the global and national markets and new trends in consumerism resulted in an increase in the volume of advertisements. Sometimes advertisers are successful in achieving their intended objectives with a particular advertisement and sometimes they are not .These factors contributed a lot towards the decision making problems of advertising agencies with regard to the selection of appropriate advertising strategies and tactics. The tough competition and large volume of advertising make the consumers confused and this even created doubts in the minds of consumers about the genuineness and reliability of manufacturers and products.
These factors caused a query regarding the active role of credibility element in advertising. The proposed study examines the effects of advertising credibility in consumer health care non durable product advertising on communication effect, purchase behavior and ad skepticism. This paper examines the need for the study of advertising credibility and reviews the advertising- consumer behaviour- credibility – healthcare theories which form a basis for the study. It identifies the different components and dimensions of advertising credibility and the importance of communication effect, purchase behavior and ad skepticism. It also studies the relevance of credibility in the consumer healthcare products advertising and suggests a Theoretical Framework for the proposed study
Description:
European Journal of Commerce and Management Research (EJCMR) Vol-I, Issue 1,DEC 2012