Anil Kumar, C V; Ramamohan, T R(Computational Materials Science, Unit I Regional Research Laboratory (Council of Scientific and Industrial Research), October , 1997)
Ramakrishnan, K; Dr. Balakrishnan, K G(Cochin University of Science & Technology, 1991)
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Abstract:
Remote Data acquisition and analysing systems
developed for fisheries and related environmental studies
have been reported. It consists of three units. The first
one namely multichannel remote data acquisition system is
installed at the remote place powered by a rechargeable
battery. It acquires and stores the 16 channel environmental
data on a battery backed up RAM. The second unit
called the Field data analyser is used for insitue display
and analysis of the data stored in the backed up RAM. The
third unit namely Laboratory data analyser is an IBM
compatible PC based unit for detailed analysis and interpretation
of the data after bringing the RAM unit to the
laboratory. The data collected using the system has been
analysed and presented in the form of a graph. The system
timer operated at negligibly low current, switches on the
power to the entire remote operated system at prefixed time
interval of 2 hours.Data storage at remote site on low power battery
backedupRAM and retrieval and analysis of data using PC are
the special i ty of the system. The remote operated system takes about 7 seconds including the 5 second stabilization
time to acquire and store data and is very ideal for remote
operation on rechargeable bat tery. The system can store
16 channel data scanned at 2 hour interval for 10 days on
2K backed up RAM with memory expansion facility for 8K RAM.
Description:
Department of Electronics,
Cochin University of Science and Technology
Krishnan Thampi, R; Dr. Sridhar, C S(Cochin University of Science & Technology, August , 1994)
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Abstract:
A new procedure for the classification of lower case
English language characters is presented in this work . The
character image is binarised and the binary image is
further grouped into sixteen smaller areas ,called Cells .
Each cell is assigned a name depending upon the contour present in the cell and occupancy of the image contour in the cell. A data reduction procedure called Filtering is adopted to eliminate undesirable redundant information for
reducing complexity during further processing steps .
The filtered data is fed into a primitive extractor where
extraction of primitives is done .
Syntactic methods are employed for the classification of
the character . A decision tree is used for the interaction of the various components in the scheme . 1ike the
primitive extraction and character recognition. A character is recognized by the primitive by primitive construction
of its description . Openended inventories are used
for including variants of the characters and also adding
new members to the general class . Computer implementation
of the proposal is discussed at the end using handwritten
character samples . Results are analyzed and suggestions
for future studies are made. The advantages of the proposal
are discussed in detail .
Description:
Department of Electronics, Cochin
University Of Science And Technology
Joseph, P M; Dr.Saseendran Pillai, P R(Cochin University of Science & Technology, May , 1992)
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Abstract:
Systems which employ underwater acoustic energy
for observation or communication are called sonar systems. The active and passive sonars are the two
types of systems used for the detection and localisation
of targets in underwater. Active sonar involves the
transmission of an acoustic signal which, when reflected
from a target, provides the sonar receiver with a basis
for the detection and estimation. Passive sonar bases
its detection and estimation on sounds which emanate
from the target itself--Machinery noise, flow noise,
transmission from its own active sonar etc.Electroacoustic transducers are used in sonar
systems for the transmission and detection of acoustic
energy. The transducer which is used for the transmission
of acoustic energy is called projector and the
one used for reception is called hydrophone. Since a
single transducer is not sufficient enough for long
range and directional transmission, a properly distributed
array of transducers are to be used [9-11].The need and requirement for spatial processing
to generate the most favourable directivity patterns for
transducer systems used in underwater applications have
already been analysed by several investigators [12-21].The desired directivity pattern can be either generated
by the use of suitable focussing techniques or by an
array of non-directional sensor elements, whose arrangements,
spacing and the mode of excitation provide the
required radiation pattern or by the combination of
these.While computing
that
the directivity pattern, it is
assumed strength of the elements are
unaffected by
the
the
source
acoustic pressure at each source.
However, in closely packed a r r a y s , the acoustic interaction
effects experienced among the elements will
modify the behaviour of individual elements and in turn
will reduce the acoust ic source leve 1 wi t h respect to
the maximum t heoret i cal va 1ue a s well as degrade the
beam pa t tern. Th i s ef fect shou 1d be reduced in systems
that are intended to generate high acoustic power output
and unperturbed beam patterns [2,22-31].The work herein presented includes an approach
for designing efficient and well behaved underwater
transd~cer arrays, taking into account the acoustic
interaction effect experienced among the closely packed
multielement arrays.Architectural modifications
reducing the interaction effect
different radiating apertures.
Description:
Department of Electronics, Cochin University
of Science and Technology.
Sumam Mary,Idicula; Paulose Jacob,K(Cochin University of Science and Technology, 1999)
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Abstract:
This work is aimed at building an adaptable frame-based system for processing Dravidian languages. There are about 17 languages in this family and they are spoken by the people of South India.Karaka relations are one of the most important features of Indian languages. They are the semabtuco-syntactic relations between verbs and other related constituents in a sentence. The karaka relations and surface case endings are analyzed for meaning extraction. This approach is comparable with the borad class of case based grammars.The efficiency of this approach is put into test in two applications. One is machine translation and the other is a natural language interface (NLI) for information retrieval from databases. The system mainly consists of a morphological analyzer, local word grouper, a parser for the source language and a sentence generator for the target language. This work make contributios like, it gives an elegant account of the relation between vibhakthi and karaka roles in Dravidian languages. This mapping is elegant and compact. The same basic thing also explains simple and complex sentence in these languages. This suggests that the solution is not just ad hoc but has a deeper underlying unity. This methodology could be extended to other free word order languages. Since the frame designed for meaning representation is general, they are adaptable to other languages coming in this group and to other applications.