2017 International Conference on Electromagnetics in Advanced Applications (ICEAA), 2017
A postprocessing method to compensate for the numerical dispersion of the Yee-FDTD scheme is pres... more A postprocessing method to compensate for the numerical dispersion of the Yee-FDTD scheme is presented. The method makes use of frequency domain deconvolution of the erroneous phase shift from the obtained results and can be applied on certain specific conditions, such as for simulations on elongated computational domains. Validation of the method is performed by comparing to analytical solution in a simplified empty-space scenario. Application to simulation of an UWB deflection sensing system is demonstrated, with good match between numerical and measured results.
2022 16th European Conference on Antennas and Propagation (EuCAP)
This paper presents an overview of the vector network analyzer (VNA)-based phase-compensated chan... more This paper presents an overview of the vector network analyzer (VNA)-based phase-compensated channel sounder at sub-6 GHz, mmWave and sub-Terahertz (sub-THz) bands. The optical cable solution can enable long-range channel measurements for all these three bands, since it can effectively minimize the cable loss. The phase compensation architecture and principle are also discussed in this paper. The accurate phase measurement is enabled by the phase compensation scheme, which is essential for application in multi-channel/antenna measurements. We summarized the performance of the designed channel sounder under two types of cable effect condition, namely thermal changes and mechanical stress. Under these two cable conditions, the phase compensated channel sounders are validated in back-toback measurements. The compensated phases demonstrate the robustness and effectiveness of these channel sounder for the frequency bands of 1-30 GHz, and 220-330 GHz.
2020 14th European Conference on Antennas and Propagation (EuCAP), 2020
Wind turbine blade deflection sensing system using ultrawideband radio links propagating along th... more Wind turbine blade deflection sensing system using ultrawideband radio links propagating along the blade is presented. Special focus is given to the challenges related to the multipath propagation along the blade. Results of electromagnetic modeling of the wireless link budget for deflected blades are presented. Some aspects of the sensing system that are different from a typical wireless communication link are discussed.
This paper proposes a new method for computing the delay spread (DS) of the mobile radio channel.... more This paper proposes a new method for computing the delay spread (DS) of the mobile radio channel. The method utilizes a 3D measurement of the received signal at a given position and assumes knowledge of the receiver antenna radiation pattern. The main advantage of this method is that it allows testing of different antennas with only one propagation measurement. It also enables easy DS computation for different orientations of the receiver antenna. The paper describes the new method and investigates its performance by comparing the computed DS values with DS values obtained from measurements directly with the tested antennas. Three typical cellular handset antennas have been used. In addition the variation in DS is shown as function of azimuth rotation of the antenna.
The aim of this work is to reach a diagnostic of the Cerrado's agriculture, centered on the evalu... more The aim of this work is to reach a diagnostic of the Cerrado's agriculture, centered on the evaluation of its spatial dynamics during the period of 1975 to 2003. Statistics of asymmetry and concentration, as well as some distance measures, are used in order to estimate mobility. In particular, at the micro-regional level, concentration and dynamics is evaluated through four sets of micro-regions (quarters), where each one has, approximately, 25 % of the total production or harvested area, of the product under study. A few maps are presented to help to visualize the spatial dynamics of the Cerrado's agriculture. As part of a broader assessment, this report is limited to annual crops selected by researchers of the Cerrado Research Center.
C elem artykułu jest omówienie dokonań Mary B. Gilson, której dorobek podczas pracy w Clothcraft ... more C elem artykułu jest omówienie dokonań Mary B. Gilson, której dorobek podczas pracy w Clothcraft Shops of the Joseph & Feiss Company 1 można uznać za pionierski w zarządzaniu zasobami ludzkimi. Osiągnięcia te warto przywołać tym bardziej, że należą do pierwszych, krytycznie oceniających tayloryzm. W artykule, na kanwie dokonań Mary B. Gilson, w oparciu o publikacje współczesne oraz historyczne, opisano rozwój naukowego zarządzania w przedsiębiorstwie produkcyjnym. Zaś dorobek Mary B. Gilson jest twórczą krytyką podejścia industrialnego i uzupełnieniem go technikami, które dziś zalicza się do nurtu human relations. W 2016 roku mija 100 lat od artykułu Richarda A. Feissa "Personal Relationship as a Basis of Scientific Management", który jako jeden z pierwszych, opisał znaczenie zasobów ludzkich: "Weźmy dwa przedsiębiorstwa, z tego samego sektora, w tym samym miejscu, zbudowane w takich
Coaxial cables are vital to a wide range of electronic systems. Phase accuracy in coaxial cables ... more Coaxial cables are vital to a wide range of electronic systems. Phase accuracy in coaxial cables is sensitive to the inevitable cable bending in actual usage and temperature change in the environment. For phase-critical applications, e.g. multi-antenna channel sounding, phase accuracy is fundamental to obtain trustworthy measurement results. A technique to track and remove random phase change in coaxial cables due to cable effect is presented. The phase-stabilizing technique provides a general phase stabilizing framework via introducing a bi-directional transmission on the cable. The principle of the phase stabilizing scheme is explained and its effectiveness is experimentally validated in a back-to-back measurement.
2017 International Conference on Electromagnetics in Advanced Applications (ICEAA), 2017
A postprocessing method to compensate for the numerical dispersion of the Yee-FDTD scheme is pres... more A postprocessing method to compensate for the numerical dispersion of the Yee-FDTD scheme is presented. The method makes use of frequency domain deconvolution of the erroneous phase shift from the obtained results and can be applied on certain specific conditions, such as for simulations on elongated computational domains. Validation of the method is performed by comparing to analytical solution in a simplified empty-space scenario. Application to simulation of an UWB deflection sensing system is demonstrated, with good match between numerical and measured results.
2022 16th European Conference on Antennas and Propagation (EuCAP)
This paper presents an overview of the vector network analyzer (VNA)-based phase-compensated chan... more This paper presents an overview of the vector network analyzer (VNA)-based phase-compensated channel sounder at sub-6 GHz, mmWave and sub-Terahertz (sub-THz) bands. The optical cable solution can enable long-range channel measurements for all these three bands, since it can effectively minimize the cable loss. The phase compensation architecture and principle are also discussed in this paper. The accurate phase measurement is enabled by the phase compensation scheme, which is essential for application in multi-channel/antenna measurements. We summarized the performance of the designed channel sounder under two types of cable effect condition, namely thermal changes and mechanical stress. Under these two cable conditions, the phase compensated channel sounders are validated in back-toback measurements. The compensated phases demonstrate the robustness and effectiveness of these channel sounder for the frequency bands of 1-30 GHz, and 220-330 GHz.
2020 14th European Conference on Antennas and Propagation (EuCAP), 2020
Wind turbine blade deflection sensing system using ultrawideband radio links propagating along th... more Wind turbine blade deflection sensing system using ultrawideband radio links propagating along the blade is presented. Special focus is given to the challenges related to the multipath propagation along the blade. Results of electromagnetic modeling of the wireless link budget for deflected blades are presented. Some aspects of the sensing system that are different from a typical wireless communication link are discussed.
This paper proposes a new method for computing the delay spread (DS) of the mobile radio channel.... more This paper proposes a new method for computing the delay spread (DS) of the mobile radio channel. The method utilizes a 3D measurement of the received signal at a given position and assumes knowledge of the receiver antenna radiation pattern. The main advantage of this method is that it allows testing of different antennas with only one propagation measurement. It also enables easy DS computation for different orientations of the receiver antenna. The paper describes the new method and investigates its performance by comparing the computed DS values with DS values obtained from measurements directly with the tested antennas. Three typical cellular handset antennas have been used. In addition the variation in DS is shown as function of azimuth rotation of the antenna.
The aim of this work is to reach a diagnostic of the Cerrado's agriculture, centered on the evalu... more The aim of this work is to reach a diagnostic of the Cerrado's agriculture, centered on the evaluation of its spatial dynamics during the period of 1975 to 2003. Statistics of asymmetry and concentration, as well as some distance measures, are used in order to estimate mobility. In particular, at the micro-regional level, concentration and dynamics is evaluated through four sets of micro-regions (quarters), where each one has, approximately, 25 % of the total production or harvested area, of the product under study. A few maps are presented to help to visualize the spatial dynamics of the Cerrado's agriculture. As part of a broader assessment, this report is limited to annual crops selected by researchers of the Cerrado Research Center.
C elem artykułu jest omówienie dokonań Mary B. Gilson, której dorobek podczas pracy w Clothcraft ... more C elem artykułu jest omówienie dokonań Mary B. Gilson, której dorobek podczas pracy w Clothcraft Shops of the Joseph & Feiss Company 1 można uznać za pionierski w zarządzaniu zasobami ludzkimi. Osiągnięcia te warto przywołać tym bardziej, że należą do pierwszych, krytycznie oceniających tayloryzm. W artykule, na kanwie dokonań Mary B. Gilson, w oparciu o publikacje współczesne oraz historyczne, opisano rozwój naukowego zarządzania w przedsiębiorstwie produkcyjnym. Zaś dorobek Mary B. Gilson jest twórczą krytyką podejścia industrialnego i uzupełnieniem go technikami, które dziś zalicza się do nurtu human relations. W 2016 roku mija 100 lat od artykułu Richarda A. Feissa "Personal Relationship as a Basis of Scientific Management", który jako jeden z pierwszych, opisał znaczenie zasobów ludzkich: "Weźmy dwa przedsiębiorstwa, z tego samego sektora, w tym samym miejscu, zbudowane w takich
Coaxial cables are vital to a wide range of electronic systems. Phase accuracy in coaxial cables ... more Coaxial cables are vital to a wide range of electronic systems. Phase accuracy in coaxial cables is sensitive to the inevitable cable bending in actual usage and temperature change in the environment. For phase-critical applications, e.g. multi-antenna channel sounding, phase accuracy is fundamental to obtain trustworthy measurement results. A technique to track and remove random phase change in coaxial cables due to cable effect is presented. The phase-stabilizing technique provides a general phase stabilizing framework via introducing a bi-directional transmission on the cable. The principle of the phase stabilizing scheme is explained and its effectiveness is experimentally validated in a back-to-back measurement.
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Papers by Kim Olesen