The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform
Jeongyon Shim - One of the best experts on this subject based on the ideXlab platform.
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ICES - Knowledge network management system with medicine self repairing strategy
Evolvable Systems: From Biology to Hardware, 2007Co-Authors: Jeongyon ShimAbstract:In the complex information environment, the role of intelligent system is getting high and it is essential to develop a smarter and more efficient intelligent system for processing automatic knowledge acquisition, structuring the memory efficient to store and retrieving the related information and repairing the system automatically. Focusing on the self repairing system, in this study Medicine Self Repairing Strategy for knowledge network management is designed. The concepts of Self type, Internal Entropy, medicine treatment are defined for modeling Self Repairing System. We applied this proposed system to virtual memory consisting of knowledge network and tested the results.
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a design of self Internal Entropy balancing system with incarnation process
LSMS'07 Proceedings of the Life system modeling and simulation 2007 international conference on Bio-Inspired computational intelligence and applicatio, 2007Co-Authors: Jeongyon ShimAbstract:In this paper, adopting the concept of autonomic nervous system, we design Self Internal Entropy Balancing System with incarnation focused on the self maintaining function, we define self type and self Internal Entropy as a property of system. This system checks SEG(Surviving Energy Gauge) periodically and make a balance by adjusting the treatment. In the case of the situation to survive, it keeps the system by processing the incarnation process. It is applied to knowledge network system of virtual memory and tested with sample data.
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LSMS (1) - A design of self Internal Entropy balancing system with incarnation process
Bio-Inspired Computational Intelligence and Applications, 2007Co-Authors: Jeongyon ShimAbstract:In this paper, adopting the concept of autonomic nervous system, we design Self Internal Entropy Balancing System with incarnation focused on the self maintaining function, we define self type and self Internal Entropy as a property of system. This system checks SEG(Surviving Energy Gauge) periodically and make a balance by adjusting the treatment. In the case of the situation to survive, it keeps the system by processing the incarnation process. It is applied to knowledge network system of virtual memory and tested with sample data.
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ICNC (5) - Intelligent Knowledge Network Management System Considering Internal Entropy Knowledge Cell
Third International Conference on Natural Computation (ICNC 2007) Vol V, 2007Co-Authors: Jeongyon ShimAbstract:Everything in the world has own properties and interacts with other things dynamically. By their associative relationship they are linked , sometimes combined and separated. These features make a living thing possible to survive in the complex environment. As more computational virtual environment is developed rapidly, the requirement of intelligent system adopting the properties of living things is getting high. Accordingly in this paper for making more efficient intelligent system, knowledge network management strategy was proposed by defining their own types and Internal Entropy of knowledge cell. We apply this system to the virtual memory and show testing results.
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Intelligent Knowledge Network Management System Considering Internal Entropy Knowledge Cell
Third International Conference on Natural Computation (ICNC 2007), 2007Co-Authors: Jeongyon ShimAbstract:Everything in the world has own properties and interacts with other things dynamically. By their associative relationship they are linked , sometimes combined and separated. These features make a living thing possible to survive in the complex environment. As more computational virtual environment is developed rapidly, the requirement of intelligent system adopting the properties of living things is getting high. Accordingly in this paper for making more efficient intelligent system, knowledge network management strategy was proposed by defining their own types and Internal Entropy of knowledge cell. We apply this system to the virtual memory and show testing results.
Jürgen Eckert - One of the best experts on this subject based on the ideXlab platform.
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Roles of hydrogenation, annealing and field in the structure and magnetic Entropy change of Tb-based bulk metallic glasses
AIP Advances, 2013Co-Authors: Björn Schwarz, Norbert Mattern, Jun Shen, Jürgen EckertAbstract:The reduction of open-volume regions in Tb-based metallic glass (MG) by annealing and hydrogen charging was found to rearrange the atomic structure and tune the magnetic behaviors. After crystallization, the magnetic structure and magnetic Entropy change (MEC) alters due to the structural transformation, and a plateau-like-MEC behavior can be obtained. The hydrogen concentration after charging at 1mA/cm2 for 576 h reaches as high as 3290 w-ppm. The magnetization behavior and the MEC change due to the modification of the exchange interaction and the random magnetic anisotropy (RMA) upon hydrogenation. At low temperatures, irreversible positive MEC was obtained, which is related to the Internal Entropy production. The RMA-to-exchange ratio acts as a switch to control the irreversible Entropy production channel and the reversible Entropy transfer channel. The field dependence of the MEC is discussed in term of the competition among Zeeman energy, exchange interaction and RMA.
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Irreversible and reversible magnetic Entropy change in a Dy-based bulk metallic glass
Intermetallics, 2012Co-Authors: Björn Schwarz, Norbert Mattern, Jürgen EckertAbstract:Abstract The magnetic Entropy change of a Dy-based bulk metallic glass (BMG) was investigated in the temperature range of 2–94 K. The alloy shows spin glass like freezing process around 18.5 K. Above the spin freezing temperature, the magnetic Entropy change is negative with a minimum about −8.3 J⋅kg −1 K −1 , demonstrating its good magnetocaloric effect (MCE) performance. Below the spin freezing temperature, irreversible positive magnetic Entropy change is obtained with a maximum of 27.7 J⋅kg −1 K −1 indicating large Internal Entropy production, which relates to the random magnetic anisotropy.
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Mechanism of the giant irreversible positive magnetic Entropy change in a Tb-based bulk metallic glass
Applied Physics Letters, 2012Co-Authors: Björn Schwarz, Norbert Mattern, Jun Shen, Jürgen EckertAbstract:A suitable coherent description of the reversible and irreversible magnetic Entropy changes in a Tb-based metallic glass with strong random magnetic anisotropy (RMA) is presented. A giant irreversible positive magnetic Entropy change is observed from magnetic measurements at low temperatures, which is found to arise from the Entropy production, while a small negative one is obtained from heat capacity measurements. The temperature dependences of the irreversible positive magnetic Entropy change under a field change of 5 T and the Internal Entropy production in the initial magnetization process can be described by an exponential law, which is determined by RMA.
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Giant irreversible positive to large reversible negative magnetic Entropy change evolution in Tb-based bulk metallic glass
Physical Review B, 2010Co-Authors: Björn Schwarz, Norbert Mattern, Jürgen EckertAbstract:We study the effects of amorphous structure and random anisotropy on the magnetic Entropy change in a series of Tb-based amorphous alloys. The amorphous structure broadens the peak of magnetic Entropy change and facilitates the adjustment of properties. The peak magnetic Entropy change above the spin freezing temperature first depends on the average magnetic moment approximately linearly and second on the exchange interaction and random anisotropy. Large and broad reversible negative magnetic Entropy changes are observed above the spin freezing temperature and giant positive irreversible magnetic Entropy changes which associate with the Internal Entropy production are obtained well below.
K. C. Ng - One of the best experts on this subject based on the ideXlab platform.
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Thermodynamic modeling of an ammonia–water absorption chiller
International Journal of Refrigeration-revue Internationale Du Froid, 2002Co-Authors: H. T. Chua, K. C. NgAbstract:Abstract This article develops a general thermodynamic framework for the modeling of an irreversible absorption chiller at the design point, with application to a single-stage ammonia–water absorption chiller. Component models of the chiller have been assembled so as to quantify the Internal Entropy production and thermal conductance (UA) in a thermodynamically rigorous formalism, which is in agreement with the simultaneous heat-and-mass transfer processes occurring within the exchangers. Local thermodynamic balance (viz. energy, Entropy, and mass balance) and consistency within the components is respected, in addition to the overall thermodynamic balance as determined by the inlet and outlet states of the components. For the absorbers, Colburn-and-Drew mass transfer equations are incorporated to describe the absorption process. Furthermore, the impact of various irreversibilities on the performance of chiller is also evaluated through the use of a general macroscopic equation.
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Thermodynamic modeling of an ammonia-water absorption chiller
International Journal of Refrigeration, 2002Co-Authors: H. T. Chua, H. K. Toh, K. C. NgAbstract:This article develops a general thermodynamic framework for the modeling of an irreversible absorption chiller at the design point, with application to a single-stage ammonia-water absorption chiller. Component models of the chiller have been assembled so as to quantify the Internal Entropy production and thermal conductance (UA) in a thermodynamically rigorous formalism, which is in agreement with the simultaneous heat-and-mass transfer processes occurring within the exchangers. Local thermodynamic balance (viz. energy, Entropy, and mass balance) and consistency within the components is respected, in addition to the overall thermodynamic balance as determined by the inlet and outlet states of the components. For the absorbers, Colburn-and-Drew mass transfer equations are incorporated to describe the absorption process. Furthermore, the impact of various irreversibilities on the performance of chiller is also evaluated through the use of a general macroscopic equation. © 2002 Elsevier Science Ltd and IIR. All rights reserved.
V Gonzalezalvarez - One of the best experts on this subject based on the ideXlab platform.
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stability analysis and passivity properties of a class of thermodynamic processes an Internal Entropy production approach
Chemical Engineering Science, 2016Co-Authors: J P Garciasandoval, Nicolas Hudon, Denis Dochain, V GonzalezalvarezAbstract:Abstract In this contribution, stability and passivity properties of a class of thermodynamic processes are addressed from a thermodynamical point of view. These thermodynamic processes can be constituted by multiple spatially homogeneous dynamic subsystems modeled by ordinary differential equations. It is shown that the Internal Entropy production may be used as a Lyapunov function candidate to prove the isolated system stability properties and as a storage function to assess the passivity properties when the system interacts with the surroundings. In addition, it is shown that the stability condition depends on a matrix whose dimension is equal to the number of modeled dynamical phenomena taking place within the system, i.e. the number of phenomena can be smaller than the system dimension. Moreover, a port-controlled Hamiltonian representation of this class of systems based on the Internal Entropy production is developed. Finally, the theory proposed is applied to three study cases: a heat exchanger, a ideal gas adiabatic chemical reactor and a ideal gas jacketed chemical reactor.
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stability analysis and passivity properties for a class of chemical reactors Internal Entropy production approach
Computers & Chemical Engineering, 2015Co-Authors: J P Garciasandoval, V Gonzalezalvarez, C CalderonAbstract:In this contribution, the stability and passivity properties of a class of chemical reactors are addressed from a thermodynamical point of view. For this purpose, a thermodynamical consistent model is derived from a generic gas reactor model whose rate is based on the reaction progress at the mesoscopic scale. It is shown that the Internal Entropy production may be used as a candidate Lyapunov function to prove the isolated system stability properties and as a storage function to emphasize the passivity properties when the chemical reactor interacts with the surroundings.
J P Garciasandoval - One of the best experts on this subject based on the ideXlab platform.
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stability analysis and passivity properties of a class of thermodynamic processes an Internal Entropy production approach
Chemical Engineering Science, 2016Co-Authors: J P Garciasandoval, Nicolas Hudon, Denis Dochain, V GonzalezalvarezAbstract:Abstract In this contribution, stability and passivity properties of a class of thermodynamic processes are addressed from a thermodynamical point of view. These thermodynamic processes can be constituted by multiple spatially homogeneous dynamic subsystems modeled by ordinary differential equations. It is shown that the Internal Entropy production may be used as a Lyapunov function candidate to prove the isolated system stability properties and as a storage function to assess the passivity properties when the system interacts with the surroundings. In addition, it is shown that the stability condition depends on a matrix whose dimension is equal to the number of modeled dynamical phenomena taking place within the system, i.e. the number of phenomena can be smaller than the system dimension. Moreover, a port-controlled Hamiltonian representation of this class of systems based on the Internal Entropy production is developed. Finally, the theory proposed is applied to three study cases: a heat exchanger, a ideal gas adiabatic chemical reactor and a ideal gas jacketed chemical reactor.
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stability analysis and passivity properties for a class of chemical reactors Internal Entropy production approach
Computers & Chemical Engineering, 2015Co-Authors: J P Garciasandoval, V Gonzalezalvarez, C CalderonAbstract:In this contribution, the stability and passivity properties of a class of chemical reactors are addressed from a thermodynamical point of view. For this purpose, a thermodynamical consistent model is derived from a generic gas reactor model whose rate is based on the reaction progress at the mesoscopic scale. It is shown that the Internal Entropy production may be used as a candidate Lyapunov function to prove the isolated system stability properties and as a storage function to emphasize the passivity properties when the chemical reactor interacts with the surroundings.