In today's internet era, with the fast progression of digital data exchange in electronic way, se... more In today's internet era, with the fast progression of digital data exchange in electronic way, securing information has become a challenge. Cryptography plays an important role in information security systems. It is a process of making information indecipherable to an unauthorized person. There are various cryptographic algorithms that can be used. Although security is important, but on the other side these algorithms consume a significant amount of computing resources such as CPU time, memory and computation time. This paper provides an analysis and comparison of some symmetric key cryptographic ciphers (DES, Triple DES, AES, Blowfish) on the basis of encryption and decryption time with text files and image files using Java as the programming language.
2011 Sbmo Ieee Mtt S International Microwave and Optoelectronics Conference, 2011
Abstract It is well known that adaptive beamformers can suffer significant performance degradatio... more Abstract It is well known that adaptive beamformers can suffer significant performance degradation when the array response vector for the desired signal is not known exactly. Diagonal loading of the correlation matrix is a popular technique applied to the minimum ...
ABSTRACT The performances of heterostructural devices are often limited by misfit dislocation. In... more ABSTRACT The performances of heterostructural devices are often limited by misfit dislocation. In this paper, a theoretical approach for misfit dislocation reduction of wurtzite InxGa1-xN/GaN is presented. The linear and exponential grading techniques have been modeled for the reduction of dislocation. An energy balance model has been taken into consideration and modified for wurtzite structure to evaluate the misfit dislocation density. The value of misfit dislocation has been reduced from 7.112×1010 cm-2 to 6.19×106 cm-2 and 7.039×1010 cm-2 to 6.121×106 cm-2 at the plane 1/3<> {} and 1/3<>{} respectively for linear grading. In case of exponential grading the dislocation density has been reduced to 2.762×105 cm-2 for both slip systems. Because of tapered grading coefficient a tapered dislocation profile has been reported in case of exponential grading technique. Finally, a comparative study has been shown among without graded, linear and exponential grading.
ABSTRACT Suspended sediment transport and sedimentation dynamics in the sub-tropical Richmond Riv... more ABSTRACT Suspended sediment transport and sedimentation dynamics in the sub-tropical Richmond River estuary were investigated between July 1994 and June 1996. During low flow months the estuary received net sediment inputs from the continental shelf; during high flow the estuary exported sediment to the continental shelf depending on the magnitude of floods. Flow-weighted sampling along with a one-dimensional unsteady flow hydrodynamic model of the estuary estimated that about fifty percent of the flood-borne suspended sediment was transported through the estuary to the continental shelf during two minor floods (with a 2-year return period), whereas, one hundred percent of the flood-borne sediment was transported to the continental shelf during a moderate flood (with a 5-year return period). Marker horizons confirmed a net accumulation of sediment in the Richmond River estuary at the salt-fresh water interface during all post flood recovery stages.
Reported herein are measured absolute single, double, and triple charge exchange (CE) cross secti... more Reported herein are measured absolute single, double, and triple charge exchange (CE) cross sections for the highly charged ions (HCIs) Cq+ (q=5,6) , Oq+ (q=6,7,8) , and Neq+ (q=7,8) colliding with the molecular species H2O , CO, and CO2 . Present data can be applied to interpreting observations of x-ray emissions from comets as they interact with the solar wind. As such, the ion impact energies of 7.0qkeV (1.62-3.06keV/amu) are representative of the fast solar wind, and data at 1.5qkeV for O6+ (0.56keV/amu) on CO and CO2 and 3.5qkeV for O5+ (1.09keV/amu) on CO provide checks of the energy dependence of the cross sections at intermediate and typical slow solar wind velocities. The HCIs are generated within a 14GHz electron cyclotron resonance ion source. Absolute CE measurements are made using a retarding potential energy analyzer, with measurement of the target gas cell pressure and incident and final ion currents. Trends in the cross sections are discussed in light of the classical overbarrier model (OBM), extended OBM, and with recent results of the classical trajectory Monte Carlo theory.
Abstract] Nitrogen and phosphorus concentrations were measured and exports were calculated in the... more Abstract] Nitrogen and phosphorus concentrations were measured and exports were calculated in the subtropical Richmond River catchment between July 0883 and June 0885[ A strati_ed sampling approach was adopted owing to the extreme and rapid changes in riverine ...
8Th International Conference on Electrical and Computer Engineering, Dec 1, 2014
ABSTRACT In this paper, lightning induced overvoltage on DC cables of solar power panel, which wa... more ABSTRACT In this paper, lightning induced overvoltage on DC cables of solar power panel, which was laid on the ground and an underground level with proper insulation thickness, was investigated when a lightning strike at a nearby place and its proper protection scheme was verified. The result shows that on ground cable voltage is approximately 28.83% more than that of the underground cable having soil resistivity 100Ω-m. Moreover, when soil resistivity increases to 1000Ω-m then the underground cable voltage is less about 48.50% than that of the on ground cable. The induced voltage caused by lightning electromagnetic interference on DC cables of solar power system at power conditioning subsystem (PCS) is analysed using electromagnetic field analysis approach. The FDTD method was applied to calculate induced voltage. Virtual Surge Test Lab (VSTL) is used for FDTD calculations, which solve Maxwell's electromagnetic equations with least approximations. The model of solar power system was represented with thin wires.
In today's internet era, with the fast progression of digital data exchange in electronic way, se... more In today's internet era, with the fast progression of digital data exchange in electronic way, securing information has become a challenge. Cryptography plays an important role in information security systems. It is a process of making information indecipherable to an unauthorized person. There are various cryptographic algorithms that can be used. Although security is important, but on the other side these algorithms consume a significant amount of computing resources such as CPU time, memory and computation time. This paper provides an analysis and comparison of some symmetric key cryptographic ciphers (DES, Triple DES, AES, Blowfish) on the basis of encryption and decryption time with text files and image files using Java as the programming language.
2011 Sbmo Ieee Mtt S International Microwave and Optoelectronics Conference, 2011
Abstract It is well known that adaptive beamformers can suffer significant performance degradatio... more Abstract It is well known that adaptive beamformers can suffer significant performance degradation when the array response vector for the desired signal is not known exactly. Diagonal loading of the correlation matrix is a popular technique applied to the minimum ...
ABSTRACT The performances of heterostructural devices are often limited by misfit dislocation. In... more ABSTRACT The performances of heterostructural devices are often limited by misfit dislocation. In this paper, a theoretical approach for misfit dislocation reduction of wurtzite InxGa1-xN/GaN is presented. The linear and exponential grading techniques have been modeled for the reduction of dislocation. An energy balance model has been taken into consideration and modified for wurtzite structure to evaluate the misfit dislocation density. The value of misfit dislocation has been reduced from 7.112×1010 cm-2 to 6.19×106 cm-2 and 7.039×1010 cm-2 to 6.121×106 cm-2 at the plane 1/3<> {} and 1/3<>{} respectively for linear grading. In case of exponential grading the dislocation density has been reduced to 2.762×105 cm-2 for both slip systems. Because of tapered grading coefficient a tapered dislocation profile has been reported in case of exponential grading technique. Finally, a comparative study has been shown among without graded, linear and exponential grading.
ABSTRACT Suspended sediment transport and sedimentation dynamics in the sub-tropical Richmond Riv... more ABSTRACT Suspended sediment transport and sedimentation dynamics in the sub-tropical Richmond River estuary were investigated between July 1994 and June 1996. During low flow months the estuary received net sediment inputs from the continental shelf; during high flow the estuary exported sediment to the continental shelf depending on the magnitude of floods. Flow-weighted sampling along with a one-dimensional unsteady flow hydrodynamic model of the estuary estimated that about fifty percent of the flood-borne suspended sediment was transported through the estuary to the continental shelf during two minor floods (with a 2-year return period), whereas, one hundred percent of the flood-borne sediment was transported to the continental shelf during a moderate flood (with a 5-year return period). Marker horizons confirmed a net accumulation of sediment in the Richmond River estuary at the salt-fresh water interface during all post flood recovery stages.
Reported herein are measured absolute single, double, and triple charge exchange (CE) cross secti... more Reported herein are measured absolute single, double, and triple charge exchange (CE) cross sections for the highly charged ions (HCIs) Cq+ (q=5,6) , Oq+ (q=6,7,8) , and Neq+ (q=7,8) colliding with the molecular species H2O , CO, and CO2 . Present data can be applied to interpreting observations of x-ray emissions from comets as they interact with the solar wind. As such, the ion impact energies of 7.0qkeV (1.62-3.06keV/amu) are representative of the fast solar wind, and data at 1.5qkeV for O6+ (0.56keV/amu) on CO and CO2 and 3.5qkeV for O5+ (1.09keV/amu) on CO provide checks of the energy dependence of the cross sections at intermediate and typical slow solar wind velocities. The HCIs are generated within a 14GHz electron cyclotron resonance ion source. Absolute CE measurements are made using a retarding potential energy analyzer, with measurement of the target gas cell pressure and incident and final ion currents. Trends in the cross sections are discussed in light of the classical overbarrier model (OBM), extended OBM, and with recent results of the classical trajectory Monte Carlo theory.
Abstract] Nitrogen and phosphorus concentrations were measured and exports were calculated in the... more Abstract] Nitrogen and phosphorus concentrations were measured and exports were calculated in the subtropical Richmond River catchment between July 0883 and June 0885[ A strati_ed sampling approach was adopted owing to the extreme and rapid changes in riverine ...
8Th International Conference on Electrical and Computer Engineering, Dec 1, 2014
ABSTRACT In this paper, lightning induced overvoltage on DC cables of solar power panel, which wa... more ABSTRACT In this paper, lightning induced overvoltage on DC cables of solar power panel, which was laid on the ground and an underground level with proper insulation thickness, was investigated when a lightning strike at a nearby place and its proper protection scheme was verified. The result shows that on ground cable voltage is approximately 28.83% more than that of the underground cable having soil resistivity 100Ω-m. Moreover, when soil resistivity increases to 1000Ω-m then the underground cable voltage is less about 48.50% than that of the on ground cable. The induced voltage caused by lightning electromagnetic interference on DC cables of solar power system at power conditioning subsystem (PCS) is analysed using electromagnetic field analysis approach. The FDTD method was applied to calculate induced voltage. Virtual Surge Test Lab (VSTL) is used for FDTD calculations, which solve Maxwell's electromagnetic equations with least approximations. The model of solar power system was represented with thin wires.
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