| URI: | http://dyuthi.cusat.ac.in/purl/5036 |
| Files | Size |
|---|---|
| SR 51(11) 38-41 (1).pdf | (4.085Mb) |
| Abstract: | The concept of convex extendability is introduced to answer the problem of finding the smallest distance convex simple graph containing a given tree. A problem of similar type with respect to minimal path convexity is also discussed. |
| URI: | http://dyuthi.cusat.ac.in/purl/2861 |
| Files | Size |
|---|---|
| Dyuthi-P00404.pdf | (88.02Kb) |
| Abstract: | Due to the advancement in mobile devices and wireless networks mobile cloud computing, which combines mobile computing and cloud computing has gained momentum since 2009. The characteristics of mobile devices and wireless network makes the implementation of mobile cloud computing more complicated than for fixed clouds. This section lists some of the major issues in Mobile Cloud Computing. One of the key issues in mobile cloud computing is the end to end delay in servicing a request. Data caching is one of the techniques widely used in wired and wireless networks to improve data access efficiency. In this paper we explore the possibility of a cooperative caching approach to enhance data access efficiency in mobile cloud computing. The proposed approach is based on cloudlets, one of the architecture designed for mobile cloud computing. |
| Description: | Global Journal of Computer Science and Technology Network, Web & Security Volume 13 Issue 8 Version 1.0 Year 2013 |
| URI: | http://dyuthi.cusat.ac.in/purl/3899 |
| Files | Size |
|---|---|
| Cooperative Cac ... Mobile Cloud Computing.pdf | (650.6Kb) |
| Abstract: | Data caching can remarkably improve the efficiency of information access in a wireless ad hoc network by reducing the access latency and bandwidth usage. The cache placement problem minimizes total data access cost in ad hoc networks with multiple data items. The ad hoc networks are multi hop networks without a central base station and are resource constrained in terms of channel bandwidth and battery power. By data caching the communication cost can be reduced in terms of bandwidth as well as battery energy. As the network node has limited memory the problem of cache placement is a vital issue. This paper attempts to study the existing cooperative caching techniques and their suitability in mobile ad hoc networks. |
| Description: | Data Science & Engineering (ICDSE), 2012 International Conference on |
| URI: | http://dyuthi.cusat.ac.in/purl/3871 |
| Files | Size |
|---|---|
| Cooperative Caching Techniques for Mobile.pdf | (146.8Kb) |
| Abstract: | Copper doped methylene blue sensitized poly(vinyl alcohol) (MBPVA)–acrylamide films were fabricated to improve the storage life of recorded gratings. The films were fabricated using gravity settling method and the copper chloride concentration was optimized as 3:18 10 3 mol/l for a dye concentration of 6:2 10 4 mol/l. The gratings recorded on the optimized film constitution could be stored for months with stable diffraction efficiency (24%) without any chemical or thermal fixing techniques. The resolution of the material is found to be unaffected with the addition of copper chloride. |
| URI: | http://dyuthi.cusat.ac.in/purl/606 |
| Files | Size |
|---|---|
| Cu doped.pdf | (123.0Kb) |
| Abstract: | Copper doped methylene blue sensitized poly(vinyl alcohol) (MBPVA)–acrylamide films were fabricated to improve the storage life of recorded gratings. The films were fabricated using gravity settling method and the copper chloride concentration was optimized as 3:18 10 3 mol/l for a dye concentration of 6:2 10 4 mol/l. The gratings recorded on the optimized film constitution could be stored for months with stable diffraction efficiency (24%) without any chemical or thermal fixing techniques. The resolution of the material is found to be unaffected with the addition of copper chloride. |
| URI: | http://dyuthi.cusat.ac.in/purl/605 |
| Files | Size |
|---|---|
| Cu doped.pdf | (123.0Kb) |
| Abstract: | Copper doped methylene blue sensitized poly(vinyl alcohol) (MBPVA)–acrylamide films were fabricated to improve the storage life of recorded gratings. The films were fabricated using gravity settling method and the copper chloride concentration was optimized as 3:18 10 3 mol/l for a dye concentration of 6:2 10 4 mol/l. The gratings recorded on the optimized film constitution could be stored for months with stable diffraction efficiency (24%) without any chemical or thermal fixing techniques. The resolution of the material is found to be unaffected with the addition of copper chloride. |
| URI: | http://dyuthi.cusat.ac.in/purl/713 |
| Files | Size |
|---|---|
| Cu doped.pdf | (123.0Kb) |
| Abstract: | Five copper(II) complexes [CuLCl]2·CuCl2·4H2O (1), [CuLOAc] (2), [CuLNO3]2 (3), [CuLN3] (4) and [CuLNCS]·3/2H2O (5) of di-2-pyridyl ketone-N4-phenyl-3-semicarbazone (HL) were synthesized and characterized by elemental analyses and electronic, infrared and EPR spectral techniques. In all these complexes the semicarbazone undergoes deprotonation and coordinates through enolate oxygen, azomethine and pyridyl nitrogen atoms. All the complexes are EPR active due to the presence of an unpaired electron. EPR spectra of all the complexes in DMF at 77K suggest axial symmetry and the presence of half field signals for the complexes 1 and 3 indicates dimeric structures |
| Description: | Spectrochimica Acta Part A 76 (2010) 322–327 doi:10.1016/j.saa.2010.03.011 |
| URI: | http://dyuthi.cusat.ac.in/purl/4001 |
| Files | Size |
|---|---|
| Copper(II) complexes derived from di-2-pyridyl.pdf | (366.4Kb) |
| Abstract: | Copper(II) complexes of two biologically important ligands, viz., embelin (2,5-dihydroxy-3-undecyl-2,5-cyclohexadien 1,4-dione) and 2-aminobenzimidazole were entrapped in the cages of zeolite Y by the flexible ligand method. The capability of these compounds in catalyzing the reduction of oxygen (industrially known as deoxo reaction) was explored and the results indicate an enhancement of the catalytic properties from that of the simple copper ion exchanged zeolite. These point to the ability of the ligands in enhancing the oxygen binding capability of the metal ion. Elemental analyses, Fourier transform infrared (FTIR), diffuse reflectance and EPR spectral studies, magnetic susceptibility measurements, TG, surface area analyses and powder X-ray diffraction studies were used in understanding the presence, composition and structure of the complexes inside the cages. The study also reveals the increased thermal and mechanical stability of the complexes as a result of encapsulation. |
| URI: | http://dyuthi.cusat.ac.in/purl/1653 |
| Files | Size |
|---|---|
| rani.pdf | (150.1Kb) |
| Abstract: | Ten copper(II) complexes {[CuL1Cl] (1), [CuL1NO3]2 (2), [CuL1N3]2 · 2/3H2O (3), [CuL1]2(ClO4)2 · 2H2O (4), [CuL2Cl]2 (5), [CuL2N3] (6), [Cu(HL2)SO4]2 · 4H2O (7), [Cu(HL2)2] (ClO4)2 · 1/2EtOH (8), [CuL3Cl]2 (9), [CuL3NCS] · 1/2H2O (10)} of three NNS donor thiosemicarbazone ligands {pyridine-2-carbaldehyde-N(4)-p-methoxyphenyl thiosemicarbazone [HL1], pyridine-2-carbaldehyde-N(4)-2-phenethyl thiosemicarbazone [HL2] and pyridine-2-carbaldehyde N(4)-(methyl), N(4)-(phenyl) thiosemicarbazone [HL3]} were synthesized and physico-chemically characterized. The crystal structure of compound 9 has been determined by X-ray diffraction studies and is found that the dimer consists of two square pyramidal Cu(II) centers linked by two chlorine atoms. |
| URI: | http://dyuthi.cusat.ac.in/xmlui/purl/2099 |
| Files | Size |
|---|---|
| Copper(II) complexes of N(4)-substituted.pdf | (709.7Kb) |
| Abstract: | In this paper a method of copy detection in short Malayalam text passages is proposed. Given two passages one as the source text and another as the copied text it is determined whether the second passage is plagiarized version of the source text. An algorithm for plagiarism detection using the n-gram model for word retrieval is developed and found tri-grams as the best model for comparing the Malayalam text. Based on the probability and the resemblance measures calculated from the n-gram comparison , the text is categorized on a threshold. Texts are compared by variable length n-gram(n={2,3,4}) comparisons. The experiments show that trigram model gives the average acceptable performance with affordable cost in terms of complexity |
| URI: | http://dyuthi.cusat.ac.in/purl/4104 |
| Files | Size |
|---|---|
| A Copy detectio ... ntsusing N-grams Model.pdf | (505.4Kb) |
| Abstract: | Geochemical composition is a set of data for predicting the climatic condition existing in an ecosystem. Both the surficial and core sediment geochemistry are helpful in monitoring, assessing and evaluating the marine environment. The aim of the research work is to assess the relationship between the biogeochemical constituents in the Cochin Estuarine System (CES), their modifications after a long period of anoxia and also to identify the various processes which control the sediment composition in this region, through a multivariate statistical approach. Therefore the study of present core sediment geochemistry has a critical role in unraveling the benchmark of their characterization. Sediment cores from four prominent zones of CES were examined for various biogeochemical aspects. The results have served as rejuvenating records for the prediction of core sediment status prevailing in the CES |
| Description: | J. Earth Syst. Sci. 122, No. 6, December 2013, pp. 1557–1570 |
| URI: | http://dyuthi.cusat.ac.in/purl/4622 |
| Files | Size |
|---|---|
| Core sediment b ... Estuarine System (CES).pdf | (585.2Kb) |
| Abstract: | Corrosion characteristics of brass panels were investigated in the Vembanad estuarine water (Cochin Harbor), India over a period of one year. The corrosion rate of brass samples during exposure was determined by gravimetric method and fouling on panels was assessed, exposure-wise, in terms of biomass. Corrosion products were identified by X-Ray diffraction. The results of the study were discussed in the light of the seawater characteristics |
| Description: | Journal of Marine Science and Technology, Vol. 18, No. 5, pp. 719-722 (2010) |
| URI: | http://dyuthi.cusat.ac.in/purl/4670 |
| Files | Size |
|---|---|
| Corrosion Behav ... embanad Estuary, India.pdf | (174.7Kb) |
| Abstract: | Corrosion represents one of the largest through life cost component of ships. Ship owners and operators recognize that combating corrosion significantly impacts the vessels’ reliability, availability and through life costs. Primary objective of this paper is to review various inspections, monitoring systems and life cycle management with respect to corrosion control of ships and to develop the concept of “Corrosion Health” (CH) which would quantify the extent of corrosion at any point of ships’ operational life. A system approach in which the ship structure is considered as a corrosion system and divided into several corrosion zones, with distinct characteristics, is presented. Various corrosion assessment criteria for assessment of corrosion condition are listed. A CH rating system for representation of complex corrosion condition with a numeric number along with recommendations for repair/maintenance action is also discussed |
| Description: | International Journal of Environmental Science and Development, Vol. 5, No. 5, October 2014 |
| URI: | http://dyuthi.cusat.ac.in/purl/4673 |
| Files | Size |
|---|---|
| Corrosion Healt ... Steel Ship Structures.pdf | (2.303Mb) |
| Abstract: | A technique for improving the coupling between a feed horn and reflector by using corrugated metallic flanges is presented. Experimental data for flanges of varying parameters are given and theoretical explanation is supplemented |
| URI: | http://dyuthi.cusat.ac.in/purl/1430 |
| Files | Size |
|---|---|
| Corrugated flan ... araboloidal reflectors.PDF | (1.323Mb) |
| Abstract: | The creation of three-dimensionally engineered nanoporous architectures via covalently interconnected nanoscale building blocks remains one of the fundamental challenges in nanotechnology. Here we report the synthesis of ordered, stacked macroscopic three-dimensional (3D) solid scaffolds of graphene oxide (GO) fabricated via chemical cross-linking of two-dimensional GO building blocks. The resulting 3D GO network solids form highly porous interconnected structures, and the controlled reduction of these structures leads to formation of 3D conductive graphene scaffolds. These 3D architectures show promise for potential applications such as gas storage; CO2 gas adsorption measurements carried out under ambient conditions show high sorption capacity, demonstrating the possibility of creating new functional carbon solids starting with two-dimensional carbon layers |
| Description: | ACS nano,VOL 7,issue 8,pp 7034-7040 |
| URI: | http://dyuthi.cusat.ac.in/purl/4385 |
| Files | Size |
|---|---|
| Covalently Inte ... Graphene Oxide Solids.pdf | (1.180Mb) |
| Abstract: | This paper presents the design and development of a compact CPW fed quad band antenna. This low profile antenna has a dimension of 32mmx31mm when printed on a substrate of dielectric constant 4.4 and height 1.6mm. The antenna covers GSM 900, DCS 1800, IEEE802.11.a, IEEE802.11.b and HiperLAN2 bands. The antenna exhibits good radiation characteristics with moderate gain |
| Description: | Applied Electromagnetics Conference (AEMC), 2009 |
| URI: | http://dyuthi.cusat.ac.in/purl/4344 |
| Files | Size |
|---|---|
| CPW-Fed Quad-Ba ... t Wireless Application.pdf | (2.805Mb) |
| Abstract: | A new geometry (semiannular) for Josephson junction has been proposed and theoretical studies have shown that the new geometry is useful for electronic applications [1, 2]. In this work we study the voltage‐current response of the junction with a periodic modulation. The fluxon experiences an oscillating potential in the presence of the ac‐bias which increases the depinning current value. We show that in a system with periodic boundary conditions, average progressive motion of fluxon commences after the amplitude of the ac drive exceeds a certain threshold value. The analytic studies are justified by simulating the equation using finite‐difference method. We observe creation and annihilation of fluxons in semiannular Josephson junction with an ac‐bias in the presence of an external magnetic field. |
| URI: | http://dyuthi.cusat.ac.in/purl/2908 |
| Files | Size |
|---|---|
| Dyuthi-P00407.pdf | (881.0Kb) |
| Abstract: | Cryptosystem using linear codes was developed in 1978 by Mc-Eliece. Later in 1985 Niederreiter and others developed a modified version of cryptosystem using concepts of linear codes. But these systems were not used frequently because of its larger key size. In this study we were designing a cryptosystem using the concepts of algebraic geometric codes with smaller key size. Error detection and correction can be done efficiently by simple decoding methods using the cryptosystem developed. Approach: Algebraic geometric codes are codes, generated using curves. The cryptosystem use basic concepts of elliptic curves cryptography and generator matrix. Decrypted information takes the form of a repetition code. Due to this complexity of decoding procedure is reduced. Error detection and correction can be carried out efficiently by solving a simple system of linear equations, there by imposing the concepts of security along with error detection and correction. Results: Implementation of the algorithm is done on MATLAB and comparative analysis is also done on various parameters of the system. Attacks are common to all cryptosystems. But by securely choosing curve, field and representation of elements in field, we can overcome the attacks and a stable system can be generated. Conclusion: The algorithm defined here protects the information from an intruder and also from the error in communication channel by efficient error correction methods. |
| URI: | http://dyuthi.cusat.ac.in/xmlui/purl/2007 |
| Files | Size |
|---|---|
| A Cryptosystem using....pdf | (93.25Kb) |
| Abstract: | A new electronically reconfigurable dual frequency microstrip patch antenna with highly simplified varactor tuning circuitry is presented. The proposed design allows relatively independent selection of the two operating frequencies. Tuning ranges of 7.1 and 4.1% are realised for the two resonant frequencies without the use of any matching circuits. |
| URI: | http://dyuthi.cusat.ac.in/purl/2758 |
| Files | Size |
|---|---|
| Dyuthi-P00377.pdf | (94.62Kb) |
Dyuthi Digital Repository Copyright © 2007-2011 Cochin University of Science and Technology. Items in Dyuthi are protected by copyright, with all rights reserved, unless otherwise indicated.