The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform
E. Baccarelli - One of the best experts on this subject based on the ideXlab platform.
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Novel efficient bit-loading algorithms for Peak-Energy-limited ADSL-type multicarrier systems
IEEE Transactions on Signal Processing, 2002Co-Authors: E. Baccarelli, A. Fasano, M. BiagiAbstract:We develop solutions for the loading of digital subscriber loop (DSL) multicarrier (MC) systems that present constraints both on overall available Energy and maximum Energy per carrier. In the emerging G.DMT-based systems planned for high-throughput multimedia applications, the constraint on the Peak-Energy arises from spectral compatibility issues. However, until today, optimal solutions for loading Peak-Energy constrained MC systems do not seem explicitly developed in the literature. Hence, starting from suitable applications of the Kuhn-Tucker conditions, we present the analytical relationships characterizing the optimal solution of the Peak-Energy-limited loading for the general case of concave "rate-functions", and then, we apply them in the context of the so-called "gap analysis". Thus, a low-complexity iterative algorithm implementing this solution is also developed, and its performance is numerically tested on several ANSI-standard asymmetric DSL (ADSL)-type loops impaired by crosstalk. Furthermore, a version of the presented loading algorithm that guarantees integer bit rates with low computational effort is also presented, and its performance is tested. The carried-out performance comparisons allow us to evaluate the throughput loss induced by Peak-Energy constraints in emerging ADSL-like services.
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On the loading of Peak-Energy-limited multicarrier systems transmitting over spectrally-shaped crosstalk-impaired DSLs
ICC 2001. IEEE International Conference on Communications. Conference Record (Cat. No.01CH37240), 2001Co-Authors: E. Baccarelli, A. Fasano, A. ZucchiAbstract:We develop the solution for optimal loading of digital subscriber loop (DSL) multicarrier (MC) systems that present constraints both on overall available Energy and maximum Energy per carrier. In the emerging ADSL3 systems planned for high-throughput multimedia applications the constraint on the Peak-Energy arises from spectral compatibility issues. However, up till now none of the published loading algorithms apparently account for Peak-Energy limitations neither optimal solutions for loading Peak-Energy constrained MC systems seem available. Therefore, starting from some results about the maximization of /spl cap/-convex functions which generalize the usual Kuhn-Tucker conditions, we present the analytical relationships characterizing the optimal Peak-Energy limited Loading. Thus, a low-complexity iterative algorithm implementing the optimal solution is also developed and its performance is numerically tested on an ANSI-standard ADSL3-type DSL impaired by crosstalk. Furthermore, a suitably modified version of the presented loading algorithm which guarantees integer-bit rates is presented.
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ICC - On the loading of Peak-Energy-limited multicarrier systems transmitting over spectrally-shaped crosstalk-impaired DSLs
ICC 2001. IEEE International Conference on Communications. Conference Record (Cat. No.01CH37240), 2001Co-Authors: E. Baccarelli, A. Fasano, A. ZucchiAbstract:We develop the solution for optimal loading of digital subscriber loop (DSL) multicarrier (MC) systems that present constraints both on overall available Energy and maximum Energy per carrier. In the emerging ADSL3 systems planned for high-throughput multimedia applications the constraint on the Peak-Energy arises from spectral compatibility issues. However, up till now none of the published loading algorithms apparently account for Peak-Energy limitations neither optimal solutions for loading Peak-Energy constrained MC systems seem available. Therefore, starting from some results about the maximization of /spl cap/-convex functions which generalize the usual Kuhn-Tucker conditions, we present the analytical relationships characterizing the optimal Peak-Energy limited Loading. Thus, a low-complexity iterative algorithm implementing the optimal solution is also developed and its performance is numerically tested on an ANSI-standard ADSL3-type DSL impaired by crosstalk. Furthermore, a suitably modified version of the presented loading algorithm which guarantees integer-bit rates is presented.
A. Fasano - One of the best experts on this subject based on the ideXlab platform.
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Novel efficient bit-loading algorithms for Peak-Energy-limited ADSL-type multicarrier systems
IEEE Transactions on Signal Processing, 2002Co-Authors: E. Baccarelli, A. Fasano, M. BiagiAbstract:We develop solutions for the loading of digital subscriber loop (DSL) multicarrier (MC) systems that present constraints both on overall available Energy and maximum Energy per carrier. In the emerging G.DMT-based systems planned for high-throughput multimedia applications, the constraint on the Peak-Energy arises from spectral compatibility issues. However, until today, optimal solutions for loading Peak-Energy constrained MC systems do not seem explicitly developed in the literature. Hence, starting from suitable applications of the Kuhn-Tucker conditions, we present the analytical relationships characterizing the optimal solution of the Peak-Energy-limited loading for the general case of concave "rate-functions", and then, we apply them in the context of the so-called "gap analysis". Thus, a low-complexity iterative algorithm implementing this solution is also developed, and its performance is numerically tested on several ANSI-standard asymmetric DSL (ADSL)-type loops impaired by crosstalk. Furthermore, a version of the presented loading algorithm that guarantees integer bit rates with low computational effort is also presented, and its performance is tested. The carried-out performance comparisons allow us to evaluate the throughput loss induced by Peak-Energy constraints in emerging ADSL-like services.
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On the loading of Peak-Energy-limited multicarrier systems transmitting over spectrally-shaped crosstalk-impaired DSLs
ICC 2001. IEEE International Conference on Communications. Conference Record (Cat. No.01CH37240), 2001Co-Authors: E. Baccarelli, A. Fasano, A. ZucchiAbstract:We develop the solution for optimal loading of digital subscriber loop (DSL) multicarrier (MC) systems that present constraints both on overall available Energy and maximum Energy per carrier. In the emerging ADSL3 systems planned for high-throughput multimedia applications the constraint on the Peak-Energy arises from spectral compatibility issues. However, up till now none of the published loading algorithms apparently account for Peak-Energy limitations neither optimal solutions for loading Peak-Energy constrained MC systems seem available. Therefore, starting from some results about the maximization of /spl cap/-convex functions which generalize the usual Kuhn-Tucker conditions, we present the analytical relationships characterizing the optimal Peak-Energy limited Loading. Thus, a low-complexity iterative algorithm implementing the optimal solution is also developed and its performance is numerically tested on an ANSI-standard ADSL3-type DSL impaired by crosstalk. Furthermore, a suitably modified version of the presented loading algorithm which guarantees integer-bit rates is presented.
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ICC - On the loading of Peak-Energy-limited multicarrier systems transmitting over spectrally-shaped crosstalk-impaired DSLs
ICC 2001. IEEE International Conference on Communications. Conference Record (Cat. No.01CH37240), 2001Co-Authors: E. Baccarelli, A. Fasano, A. ZucchiAbstract:We develop the solution for optimal loading of digital subscriber loop (DSL) multicarrier (MC) systems that present constraints both on overall available Energy and maximum Energy per carrier. In the emerging ADSL3 systems planned for high-throughput multimedia applications the constraint on the Peak-Energy arises from spectral compatibility issues. However, up till now none of the published loading algorithms apparently account for Peak-Energy limitations neither optimal solutions for loading Peak-Energy constrained MC systems seem available. Therefore, starting from some results about the maximization of /spl cap/-convex functions which generalize the usual Kuhn-Tucker conditions, we present the analytical relationships characterizing the optimal Peak-Energy limited Loading. Thus, a low-complexity iterative algorithm implementing the optimal solution is also developed and its performance is numerically tested on an ANSI-standard ADSL3-type DSL impaired by crosstalk. Furthermore, a suitably modified version of the presented loading algorithm which guarantees integer-bit rates is presented.
Soolyeon Cho - One of the best experts on this subject based on the ideXlab platform.
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Development of an intelligent building controller to mitigate indoor thermal dissatisfaction and Peak Energy demands in a district heating system
Building and Environment, 2017Co-Authors: Jonghoon Ahn, Soolyeon ChoAbstract:District heating systems were gradually improved with the development of generation, storage, distribution technologies, and the demands continued to expand significantly. The percentage of houses supplied by district heating systems were fast grown up, and it was reported that the global market for the systems would expand by about 6% in the period between 2016 and 2024. However, most studies for district heating models focused on fuel use in plants, Energy distribution, and carbon reduction. Many simulations adopting computing technologies dealt with mechanical performances in the systems. Also, recent statistical analyses overlooked zone-scaled thermal comfort directly affecting users' workability in buildings. This research proposes an intelligent controller to improve thermal comfort and reduce Peak Energy demands in a district heating system. An artificial intelligence based model with temperature and thermal comfort detectors optimizes supply air conditions to maintain desired room temperature responding to users' characteristics in four different building types. The model reduces Peak demands for cooling and heating to optimize plant and distribution capacity. Comparative analyses describe the model's effectiveness that it improves thermal comfort level by 27%, and that it reduces Peak Energy demands by 30% in comparison with a conventional on/off controller. The model has an advantage that it properly responds to temperature changes with high performance to mitigate thermal dissatisfaction and Energy loss. In spite of the sensitive controls to ensure human comfort, it is confirmed that the model can contribute to design optimization for Energy supply systems in urban scaled models.
H. Asahi - One of the best experts on this subject based on the ideXlab platform.
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Temperature stable wavelength TlInGaAs/InP DH LEDs grown by gas source MBE
Conference Proceedings. 2001 International Conference on Indium Phosphide and Related Materials. 13th IPRM (Cat. No.01CH37198), 2001Co-Authors: K. Konishi, O. Maeda, A. Mizobata, K. Asami, H. AsahiAbstract:TlInGaAs/InP double heterostructure (DH) light emitting diodes (LEDs) were grown on [100] InP substrates by gas source molecular beam epitaxy. The Tl composition was 6%. They were operated up to 340 K in the wavelength range of 1.58 /spl mu/m. Very small temperature variation in the electroluminescence (EL) Peak Energy (-0.09 meV/K) was observed, similar to the temperature variation of photoluminescence (PL) Peak Energy.
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TlInGaAs/InP DH LEDs with small temperature variation in EL Peak Energy
Electronics Letters, 2001Co-Authors: K. Konishi, H. Asahi, O. Maeda, Y.k. Zhou, A. Mizobata, K. AsamiAbstract:TlInGaAs-InP double heterostructure light emitting diodes with a Tl composition of 6% operating in the wavelength range of 1.58 /spl mu/m have been fabricated by gas source molecular beam epitaxy and a very small temperature variation in the electroluminescence Peak Energy (-0.09 meV/K) observed.
K. Asami - One of the best experts on this subject based on the ideXlab platform.
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Temperature stable wavelength TlInGaAs/InP DH LEDs grown by gas source MBE
Conference Proceedings. 2001 International Conference on Indium Phosphide and Related Materials. 13th IPRM (Cat. No.01CH37198), 2001Co-Authors: K. Konishi, O. Maeda, A. Mizobata, K. Asami, H. AsahiAbstract:TlInGaAs/InP double heterostructure (DH) light emitting diodes (LEDs) were grown on [100] InP substrates by gas source molecular beam epitaxy. The Tl composition was 6%. They were operated up to 340 K in the wavelength range of 1.58 /spl mu/m. Very small temperature variation in the electroluminescence (EL) Peak Energy (-0.09 meV/K) was observed, similar to the temperature variation of photoluminescence (PL) Peak Energy.
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TlInGaAs/InP DH LEDs with small temperature variation in EL Peak Energy
Electronics Letters, 2001Co-Authors: K. Konishi, H. Asahi, O. Maeda, Y.k. Zhou, A. Mizobata, K. AsamiAbstract:TlInGaAs-InP double heterostructure light emitting diodes with a Tl composition of 6% operating in the wavelength range of 1.58 /spl mu/m have been fabricated by gas source molecular beam epitaxy and a very small temperature variation in the electroluminescence Peak Energy (-0.09 meV/K) observed.
