The Experts below are selected from a list of 191964 Experts worldwide ranked by ideXlab platform
Akira Misawa - One of the best experts on this subject based on the ideXlab platform.
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dynamic path bandwidth allocation for 1000 10 scale Optical Layer 2 switch network based on hierarchical timeslot allocation algorithm and timeslot converter
European Conference on Optical Communication, 2013Co-Authors: Kyota Hattori, Masahiro Nakagawa, Naoki Kimishima, Masaru Katayama, Akira MisawaAbstract:We are developing Optical Layer-2 switch network that achieves dynamic path bandwidth allocation (DPBA) for efficient aggregation in metro NWs. We show the experimental results of DPBA cycle according to variations in traffic on NW scale of 1000×10.
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Hierarchical timeslot allocation for Optical Layer-2 switch network
2013 18th OptoElectronics and Communications Conference held jointly with 2013 International Conference on Photonics in Switching, 2013Co-Authors: Masahiro Nakagawa, Kyota Hattori, Naoki Kimishima, Masaru Katayama, Akira MisawaAbstract:We propose a novel timeslot allocation method that utilizes hierarchical calculation. This method has a shorter computation time and enables dynamic path control in 1K-node-scale Optical Layer-2 switch network system, leading to cost-effective metro networks.
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Dynamic path bandwidth allocation for 1000×10-scale Optical Layer-2 switch network based on hierarchical timeslot allocation algorithm and timeslot converter
39th European Conference and Exhibition on Optical Communication (ECOC 2013), 2013Co-Authors: Kyota Hattori, Masahiro Nakagawa, Naoki Kimishima, Masaru Katayama, Akira MisawaAbstract:We are developing Optical Layer-2 switch network that achieves dynamic path bandwidth allocation (DPBA) for efficient aggregation in metro NWs. We show the experimental results of DPBA cycle according to variations in traffic on NW scale of 1000×10.
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Optical Layer 2 switch network based on wdm tdm nano sec wavelength switching
European Conference and Exhibition on Optical Communications, 2012Co-Authors: Kyota Hattori, Masahiro Nakagawa, Naoki Kimishima, Masaru Katayama, Akira Misawa, Atsushi HiramatsuAbstract:It is necessary for metro networksto become more energy-saving and efficient for traffic from access networks. We propose an Optical Layer-2 switch network based on WDM/TDM rings, achieve the dynamic bandwidth allocation and ADD/DROP with no buffer/header by changing wavelength in nsec according to allocated timeslots.
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Optical Layer-2 switch network based on WDM/TDM nano-sec wavelength switching
European Conference and Exhibition on Optical Communication, 2012Co-Authors: Kyota Hattori, Masahiro Nakagawa, Naoki Kimishima, Masaru Katayama, Akira Misawa, Atsushi HiramatsuAbstract:It is necessary for metro networksto become more energy-saving and efficient for traffic from access networks. We propose an Optical Layer-2 switch network based on WDM/TDM rings, achieve the dynamic bandwidth allocation and ADD/DROP with no buffer/header by changing wavelength in nsec according to allocated timeslots.
Kyota Hattori - One of the best experts on this subject based on the ideXlab platform.
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dynamic path bandwidth allocation for 1000 10 scale Optical Layer 2 switch network based on hierarchical timeslot allocation algorithm and timeslot converter
European Conference on Optical Communication, 2013Co-Authors: Kyota Hattori, Masahiro Nakagawa, Naoki Kimishima, Masaru Katayama, Akira MisawaAbstract:We are developing Optical Layer-2 switch network that achieves dynamic path bandwidth allocation (DPBA) for efficient aggregation in metro NWs. We show the experimental results of DPBA cycle according to variations in traffic on NW scale of 1000×10.
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Hierarchical timeslot allocation for Optical Layer-2 switch network
2013 18th OptoElectronics and Communications Conference held jointly with 2013 International Conference on Photonics in Switching, 2013Co-Authors: Masahiro Nakagawa, Kyota Hattori, Naoki Kimishima, Masaru Katayama, Akira MisawaAbstract:We propose a novel timeslot allocation method that utilizes hierarchical calculation. This method has a shorter computation time and enables dynamic path control in 1K-node-scale Optical Layer-2 switch network system, leading to cost-effective metro networks.
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Dynamic path bandwidth allocation for 1000×10-scale Optical Layer-2 switch network based on hierarchical timeslot allocation algorithm and timeslot converter
39th European Conference and Exhibition on Optical Communication (ECOC 2013), 2013Co-Authors: Kyota Hattori, Masahiro Nakagawa, Naoki Kimishima, Masaru Katayama, Akira MisawaAbstract:We are developing Optical Layer-2 switch network that achieves dynamic path bandwidth allocation (DPBA) for efficient aggregation in metro NWs. We show the experimental results of DPBA cycle according to variations in traffic on NW scale of 1000×10.
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Optical Layer 2 switch network based on wdm tdm nano sec wavelength switching
European Conference and Exhibition on Optical Communications, 2012Co-Authors: Kyota Hattori, Masahiro Nakagawa, Naoki Kimishima, Masaru Katayama, Akira Misawa, Atsushi HiramatsuAbstract:It is necessary for metro networksto become more energy-saving and efficient for traffic from access networks. We propose an Optical Layer-2 switch network based on WDM/TDM rings, achieve the dynamic bandwidth allocation and ADD/DROP with no buffer/header by changing wavelength in nsec according to allocated timeslots.
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Optical Layer-2 switch network based on WDM/TDM nano-sec wavelength switching
European Conference and Exhibition on Optical Communication, 2012Co-Authors: Kyota Hattori, Masahiro Nakagawa, Naoki Kimishima, Masaru Katayama, Akira Misawa, Atsushi HiramatsuAbstract:It is necessary for metro networksto become more energy-saving and efficient for traffic from access networks. We propose an Optical Layer-2 switch network based on WDM/TDM rings, achieve the dynamic bandwidth allocation and ADD/DROP with no buffer/header by changing wavelength in nsec according to allocated timeslots.
Manfred Wendisch - One of the best experts on this subject based on the ideXlab platform.
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Spectral Optical Layer properties of cirrus from collocated airborne measurements and simulations
Atmospheric Chemistry and Physics, 2016Co-Authors: Fanny Finger, Frank Werner, Marcus Klingebiel, André Ehrlich, Evelyn Jäkel, Matthias Voigt, Stephan Borrmann, Peter Spichtinger, Manfred WendischAbstract:Abstract. Spectral upward and downward solar irradiances from vertically collocated measurements above and below a cirrus Layer are used to derive cirrus Optical Layer properties such as spectral transmissivity, absorptivity, reflectivity, and cloud top albedo. The radiation measurements are complemented by in situ cirrus crystal size distribution measurements and radiative transfer simulations based on the microphysical data. The close collocation of the radiative and microphysical measurements, above, beneath, and inside the cirrus, is accomplished by using a research aircraft (Learjet 35A) in tandem with the towed sensor platform AIRTOSS (AIRcraft TOwed Sensor Shuttle). AIRTOSS can be released from and retracted back to the research aircraft by means of a cable up to a distance of 4 km. Data were collected from two field campaigns over the North Sea and the Baltic Sea in spring and late summer 2013. One measurement flight over the North Sea proved to be exemplary, and as such the results are used to illustrate the benefits of collocated sampling. The radiative transfer simulations were applied to quantify the impact of cloud particle properties such as crystal shape, effective radius reff, and Optical thickness τ on cirrus spectral Optical Layer properties. Furthermore, the radiative effects of low-level, liquid water (warm) clouds as frequently observed beneath the cirrus are evaluated. They may cause changes in the radiative forcing of the cirrus by a factor of 2. When low-level clouds below the cirrus are not taken into account, the radiative cooling effect (caused by reflection of solar radiation) due to the cirrus in the solar (shortwave) spectral range is significantly overestimated.
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Spectral Optical Layer properties of cirrus from collocated airborne measurements – a feasibility study
2015Co-Authors: Fanny Finger, Frank Werner, Marcus Klingebiel, André Ehrlich, Evelyn Jäkel, Matthias Voigt, Stephan Borrmann, Peter Spichtinger, Manfred WendischAbstract:Abstract. Spectral Optical Layer properties of cirrus are derived from simultaneous and vertically collocated measurements of spectral upward and downward solar irradiance above and below the cloud Layer and concurrent in situ microphysical sampling. From the irradiance data spectral transmissivity, absorptivity, reflectivity, and cloud top albedo of the observed cirrus Layer are obtained. At the same time microphysical properties of the cirrus were sampled. The close collocation of the radiative and microphysical measurements, above, beneath and inside the cirrus, is obtained by using a research aircraft (Learjet 35A) in tandem with a towed platform called AIRTOSS (AIRcraft TOwed Sensor Shuttle). AIRTOSS can be released from and retracted back to the research aircraft by means of a cable up to a distance of 4 km. Data were collected in two field campaigns above the North and Baltic Sea in spring and late summer 2013. Exemplary results from one measuring flight are discussed also to illustrate the benefits of collocated sampling. Based on the measured cirrus microphysical properties, radiative transfer simulations were applied to quantify the impact of cloud particle properties such as crystal shape, effective radius reff, and Optical thickness τ on cirrus Optical Layer properties. The effects of clouds beneath the cirrus are evaluated in addition. They cause differences in the Layer properties of the cirrus by a factor of 2 to 3, and for cirrus radiative forcing by up to a factor of 4. If low-level clouds below cirrus are not considered the solar cooling due to the cirrus is significantly overestimated.
Masahiro Nakagawa - One of the best experts on this subject based on the ideXlab platform.
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dynamic path bandwidth allocation for 1000 10 scale Optical Layer 2 switch network based on hierarchical timeslot allocation algorithm and timeslot converter
European Conference on Optical Communication, 2013Co-Authors: Kyota Hattori, Masahiro Nakagawa, Naoki Kimishima, Masaru Katayama, Akira MisawaAbstract:We are developing Optical Layer-2 switch network that achieves dynamic path bandwidth allocation (DPBA) for efficient aggregation in metro NWs. We show the experimental results of DPBA cycle according to variations in traffic on NW scale of 1000×10.
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Hierarchical timeslot allocation for Optical Layer-2 switch network
2013 18th OptoElectronics and Communications Conference held jointly with 2013 International Conference on Photonics in Switching, 2013Co-Authors: Masahiro Nakagawa, Kyota Hattori, Naoki Kimishima, Masaru Katayama, Akira MisawaAbstract:We propose a novel timeslot allocation method that utilizes hierarchical calculation. This method has a shorter computation time and enables dynamic path control in 1K-node-scale Optical Layer-2 switch network system, leading to cost-effective metro networks.
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Dynamic path bandwidth allocation for 1000×10-scale Optical Layer-2 switch network based on hierarchical timeslot allocation algorithm and timeslot converter
39th European Conference and Exhibition on Optical Communication (ECOC 2013), 2013Co-Authors: Kyota Hattori, Masahiro Nakagawa, Naoki Kimishima, Masaru Katayama, Akira MisawaAbstract:We are developing Optical Layer-2 switch network that achieves dynamic path bandwidth allocation (DPBA) for efficient aggregation in metro NWs. We show the experimental results of DPBA cycle according to variations in traffic on NW scale of 1000×10.
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Optical Layer 2 switch network based on wdm tdm nano sec wavelength switching
European Conference and Exhibition on Optical Communications, 2012Co-Authors: Kyota Hattori, Masahiro Nakagawa, Naoki Kimishima, Masaru Katayama, Akira Misawa, Atsushi HiramatsuAbstract:It is necessary for metro networksto become more energy-saving and efficient for traffic from access networks. We propose an Optical Layer-2 switch network based on WDM/TDM rings, achieve the dynamic bandwidth allocation and ADD/DROP with no buffer/header by changing wavelength in nsec according to allocated timeslots.
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Optical Layer-2 switch network based on WDM/TDM nano-sec wavelength switching
European Conference and Exhibition on Optical Communication, 2012Co-Authors: Kyota Hattori, Masahiro Nakagawa, Naoki Kimishima, Masaru Katayama, Akira Misawa, Atsushi HiramatsuAbstract:It is necessary for metro networksto become more energy-saving and efficient for traffic from access networks. We propose an Optical Layer-2 switch network based on WDM/TDM rings, achieve the dynamic bandwidth allocation and ADD/DROP with no buffer/header by changing wavelength in nsec according to allocated timeslots.
Masaru Katayama - One of the best experts on this subject based on the ideXlab platform.
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dynamic path bandwidth allocation for 1000 10 scale Optical Layer 2 switch network based on hierarchical timeslot allocation algorithm and timeslot converter
European Conference on Optical Communication, 2013Co-Authors: Kyota Hattori, Masahiro Nakagawa, Naoki Kimishima, Masaru Katayama, Akira MisawaAbstract:We are developing Optical Layer-2 switch network that achieves dynamic path bandwidth allocation (DPBA) for efficient aggregation in metro NWs. We show the experimental results of DPBA cycle according to variations in traffic on NW scale of 1000×10.
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Hierarchical timeslot allocation for Optical Layer-2 switch network
2013 18th OptoElectronics and Communications Conference held jointly with 2013 International Conference on Photonics in Switching, 2013Co-Authors: Masahiro Nakagawa, Kyota Hattori, Naoki Kimishima, Masaru Katayama, Akira MisawaAbstract:We propose a novel timeslot allocation method that utilizes hierarchical calculation. This method has a shorter computation time and enables dynamic path control in 1K-node-scale Optical Layer-2 switch network system, leading to cost-effective metro networks.
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Dynamic path bandwidth allocation for 1000×10-scale Optical Layer-2 switch network based on hierarchical timeslot allocation algorithm and timeslot converter
39th European Conference and Exhibition on Optical Communication (ECOC 2013), 2013Co-Authors: Kyota Hattori, Masahiro Nakagawa, Naoki Kimishima, Masaru Katayama, Akira MisawaAbstract:We are developing Optical Layer-2 switch network that achieves dynamic path bandwidth allocation (DPBA) for efficient aggregation in metro NWs. We show the experimental results of DPBA cycle according to variations in traffic on NW scale of 1000×10.
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Optical Layer 2 switch network based on wdm tdm nano sec wavelength switching
European Conference and Exhibition on Optical Communications, 2012Co-Authors: Kyota Hattori, Masahiro Nakagawa, Naoki Kimishima, Masaru Katayama, Akira Misawa, Atsushi HiramatsuAbstract:It is necessary for metro networksto become more energy-saving and efficient for traffic from access networks. We propose an Optical Layer-2 switch network based on WDM/TDM rings, achieve the dynamic bandwidth allocation and ADD/DROP with no buffer/header by changing wavelength in nsec according to allocated timeslots.
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Optical Layer-2 switch network based on WDM/TDM nano-sec wavelength switching
European Conference and Exhibition on Optical Communication, 2012Co-Authors: Kyota Hattori, Masahiro Nakagawa, Naoki Kimishima, Masaru Katayama, Akira Misawa, Atsushi HiramatsuAbstract:It is necessary for metro networksto become more energy-saving and efficient for traffic from access networks. We propose an Optical Layer-2 switch network based on WDM/TDM rings, achieve the dynamic bandwidth allocation and ADD/DROP with no buffer/header by changing wavelength in nsec according to allocated timeslots.