Bright Singh, I S; Rosamma, Philip; Resmy, Varghese; Manjusha, M; Mohandas, A(Elsevier, August 15, 2009)
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Abstract:
To demonstrate pathological changes due to white spot virus infection in Fenneropenaeus indicus, a batch
of hatchery bred quarantined animals was experimentally infected with the virus. Organs such as gills,
foregut, mid-gut, hindgut, nerve, eye, heart, ovary and integument were examined by light and electron
microscopy. Histopathological analyses revealed changes hitherto not reported in F. indicus such as
lesions to the internal folding of gut resulted in syncytial mass sloughed off into lumen, thickening of
hepatopancreatic connective tissue with vacuolization of tubules and necrosis of rectal pads in hindgut.
Virus replication was seen in the crystalline tract region of the compound eye and eosinophilic granules
infiltrated from its base. In the gill arch, dilation and disintegration of median blood vessel was observed.
In the nervous tissues, encapsulation and subsequent atrophy of hypertrophied nuclei of the neurosecretory
cells were found. Transmission electron microscopy showed viral replication and morphogenesis in
cells of infected tissue. De novo formed vesicles covered the capsid forming a bilayered envelop opened at
one end inside the virogenic stroma. Circular vesicles containing nuclear material was found fused with
the envelop. Subsequent thickening of the envelop resulted in the fully formed virus. In this study, a correlation
was observed between the stages of viral multiplication and the corresponding pathological
changes in the cells during the WSV infection. Accordingly, gill and foregut tissues were found highly
infected during the onset of clinical signs itself, and are proposed to be used as the tissues for routine disease
diagnosis.
Description:
Journal of Invertebrate Pathology 102 (2009) 225–232
Subhash, Chandra Soni(Cochin University of Science and Technology, April , 1986)
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Abstract:
The thesis embodies the results of the studies carried out on certain diseases affecting the commercially important penaeid prawns in the capture and culture fisheries of the southwest and southeast coasts of india during october, 1981 to april 1985.initially a survey is conducted to obtain information and to understand the commom diseases and abnormalities occurring in the penaeid prawms in nature and those farmed. A result of the survey then cases of diseases and abnormalities are reported. These include tumour like growth soft prawm syndrome, tail necrosis brown spot disease, red rostrum, ciliate infestation ,helminth parasitisation,metacercarial infestation and bopyrid infestation in the penaeid prawns such as penaeus indicus p. monodon , p. semisulcatus ,Metapenaeus
dobsoni and m.affinis.The symptoms ,occurrence and incidence of each of the above cases are
provided along with the information on environmental factors such as salinity,dissolved oxygen,temperature and ph of the water from the collection sites. The nature of the disease,the tissuse of the host that are affected by the infection or infestation or by the pathogen ,and the
actors influencing the infection in each of the ten cases are studied histopathologically and discussed. In the light of the available published information, the control measures for the different diseases of penaeid prawns are presented and discussed.
Description:
Center of Advanced studies in Mariculture, Central Marine fisheries research Institute
Jomy, John; Dr.Pramod, K V(Cochin University of Science And Technology, January 30, 2014)
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Abstract:
The objective of the study is to develop a hand written character recognition system that could recognisze all the characters in the mordern script of malayalam language at a high recognition rate
Description:
Department of Computer Applications
Cochin University of Science and Technology
Sonny, V A; Dr.Chandrasekharan Pillai, N(Cochin University of Science and Technology, July 28, 1993)
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Abstract:
The study is undertaken by the researcher with the object of examining the remuneration pattern of executive personnel in the manufacturing public enterprises in Kerala so as to find out whether there is any rationale or criteria involved in remunerating executives. It is also envisaged to find out the pattern of executive remuneration in the various categories of industries and inter—industry disparities among the public sector enterprises. This is considered to be a very fruitful area for investigation, particularly in view of the generally prevailing notion that public sector executives in Kerala are not remunerated properly and glaring inequalities and disparities are existing among the various categories of industries and within the same industry. Therefore the study is to explore the criteria used for the determination of executive remuneration and the relative weightage of various factors such as size of the firm, rate of return sales volume etc of the organisation and various other factors such as qualification, experience, level of job and functions of executives. Further the study is extended to find out the role of 'pay' towards motivation and efficiency of the executive personnel
Description:
School of Management Studies, Cochin University of Science and Technology
In this paper we investigate the problem of cache resolution in a mobile peer to peer ad hoc network. In our
vision cache resolution should satisfy the following requirements: (i) it should result in low message
overhead and (ii) the information should be retrieved with minimum delay. In this paper, we show that
these goals can be achieved by splitting the one hop neighbours in to two sets based on the transmission
range. The proposed approach reduces the number of messages flooded in to the network to find the
requested data. This scheme is fully distributed and comes at very low cost in terms of cache overhead. The
experimental results gives a promising result based on the metrics of studies.
Description:
International Journal of Wireless & Mobile Networks (IJWMN) Vol. 5, No. 5, October 2013
This study shows that the disease resistance and survival
rate of Penaeus monodon in a larval rearing systems
can be enhanced by supplementing with antagonistic
or non-antagonistic probiotics. The antagonistic mode
of action of Pseudomonas MCCB 102 and MCCB 103
against vibrios was demonstrated in larval mesocosm
with cultures having su⁄cient concentration of antagonistic
compounds in their culture supernatant. Investigations
on the antagonistic properties of Bacillus
MCCB 101, Pseudomonas MCCB 102 and MCCB 103
and Arthrobacter MCCB 104 against Vibrio harveyi
MCCB111under in vitro conditions revealed that Pseudomonas
MCCB 102 and MCCB 103 were inhibitory to
the pathogen.These inhibitory propertieswere further
con¢rmed in the larval rearing systems of P. monodon.
All these four probionts signi¢cantly improved larval
survival in long-term treatments as well as when challengedwith
a pathogenic strain ofV. harveyiMCCB111.
We could demonstrate that Pseudomonas MCCB 102
andMCCB103 accorded disease resistance and a higher
survival rate in P. monodon larval rearing systems
throughactive antagonism of vibrios,whereas Bacillus
MCCB 101 and Arthrobacter MCCB 104 functioned as
probiotics through immunostimulatory and digestive
enzyme-supporting modes of action.
Poulose Jacob,K; Rekha, James K; Sreela Sasi(IEEE, April 1, 2009)
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Abstract:
Decimal multiplication is an integral part of financial,
commercial, and internet-based computations. This paper
presents a novel double digit decimal multiplication
(DDDM) technique that performs 2 digit multiplications
simultaneously in one clock cycle. This design offers low
latency and high throughput. When multiplying two n-digit
operands to produce a 2n-digit product, the design has a
latency of (n / 2) 1 cycles. The paper presents area
and delay comparisons for 7-digit, 16-digit, 34-digit double
digit decimal multipliers on different families of Xilinx,
Altera, Actel and Quick Logic FPGAs. The multipliers
presented can be extended to support decimal floating-point
multiplication for IEEE P754 standard
Description:
Programmable Logic, 2009. SPL. 5th Southern Conference on
Poulose Jacob,K; Shahana, T K; James, R K; Jose, B R; Sasi, S(IEEE, October 17, 2007)
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Abstract:
Residue Number System (RNS) based Finite Impulse Response (FIR) digital filters and
traditional FIR filters. This research is motivated by the importance of an efficient filter
implementation for digital signal processing. The comparison is done in terms of speed and
area requirement for various filter specifications. RNS based FIR filters operate more than
three times faster and consumes only about 60% of the area than traditional filter when
number of filter taps is more than 32. The area for RNS filter is increasing at a lesser rate than that for traditional resulting in lower power consumption. RNS is a nonweighted number system without carry propogation between different residue digits.This enables simultaneous parallel processing on all the digits resulting in high speed addition and multiplication in the RNS domain
Description:
Communications and Information Technologies, 2007. ISCIT'07. International Symposium on
Poulose Jacob,K; Sreela Sasi; Rekha, James K; Shahana, T K(International Conference on Computer Science and Applications, October , 2007)
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This paper presents a performance analysis of
reversible, fault tolerant VLSI implementations of carry select
and hybrid decimal adders suitable for multi-digit BCD
addition. The designs enable partial parallel processing of all
digits that perform high-speed addition in decimal domain.
When the number of digits is more than 25 the hybrid decimal
adder can operate 5 times faster than conventional decimal
adder using classical logic gates. The speed up factor of hybrid
adder increases above 10 when the number of decimal digits is
more than 25 for reversible logic implementation. Such highspeed
decimal adders find applications in real time processors
and internet-based applications. The implementations use only
reversible conservative Fredkin gates, which make it suitable for
VLSI circuits.
Description:
Proceedings of the World Congress on Engineering and Computer Science 2007
WCECS 2007, October 24-26, 2007, San Francisco, USA
Narayanan, K P; Pradeep, K R; Anju, Mohanan(IJSER, May , 2013)
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Abstract:
A sandwich construction is a special form of the laminated composite consisting of light weight core, sandwiched between two stiff thin
face sheets. Due to high stiffness to weight ratio, sandwich construction is widely adopted in aerospace industries. As a process dependent bonded
structure, the most severe defects associated with sandwich construction are debond (skin core bond failure) and dent (locally deformed skin
associated with core crushing). Reasons for debond may be attributed to initial manufacturing flaws or in service loads and dent can be caused by
tool drops or impacts by foreign objects. This paper presents an evaluation on the performance of honeycomb sandwich cantilever beam with the
presence of debond or dent, using layered finite element models. Dent is idealized by accounting core crushing in the core thickness along with the
eccentricity of the skin. Debond is idealized using multilaminate modeling at debond location with contact element between the laminates.
Vibration and buckling behavior of metallic honeycomb sandwich beam with and without damage are carried out. Buckling load factor, natural
frequency, mode shape and modal strain energy are evaluated using finite element package ANSYS 13.0. Study shows that debond affect the
performance of the structure more severely than dent. Reduction in the fundamental frequencies due to the presence of dent or debond is not
significant for the case considered. But the debond reduces the buckling load factor significantly. Dent of size 8-20% of core thickness shows 13%
reduction in buckling load capacity of the sandwich column. But debond of the same size reduced the buckling load capacity by about 90%. This
underscores the importance of detecting these damages in the initiation level itself to avoid catastrophic failures. Influence of the damages on
fundamental frequencies, mode shape and modal strain energy are examined. Effectiveness of these parameters as a damage detection tool for
sandwich structure is also assessed
Description:
International Journal Of Scientific & Engineering Research Volume 4, Issue 5, May-2013
Bindhu M, Krishna; Manu P, John; Nandakumaran, V M(Indian Academy of Sciences, December , 2008)
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Abstract:
The chaotic dynamics of directly modulated semiconductor lasers with delayed optoelectronic feedback is studied numerically. The effects of positive and negative delayed optoelectronic feedback in producing chaotic outputs from such lasers with nonlinear gain reduction in its optimum value range is investigated using bifurcation diagrams. The results are confirmed by calculating the Lyapunov exponents. A negative delayed optoelectronic feedback configuration is found to be more effective in inducing chaotic dynamics to such systems with nonlinear gain reduction factor in the practical value range.