Zobrazeno 1 - 10
of 65
pro vyhledávání: '"Joo-Gwang Lee"'
Publikováno v:
Journal of Electromagnetic Engineering and Science, Vol 24, Iss 4, Pp 370-376 (2024)
Using the intermediate frequency (IF) substitution method, this study establishes a low-frequency attenuation measurement standard operating in the 9 kHz to 10 MHz frequency range. We designed and fabricated a low-frequency attenuation measuring inst
Externí odkaz:
https://doaj.org/article/fe0cbfb2f6704349b884ce0b888c73c5
Publikováno v:
Journal of Electromagnetic Engineering and Science, Vol 21, Iss 2, Pp 87-94 (2021)
This paper presents a method for the accurate and traceable measurement of the analog modulation index. A calibrated step attenuator was used as the main apparatus because it has a higher dynamic range and lower uncertainty than a spectrum analyzer o
Externí odkaz:
https://doaj.org/article/9ea5b0a3b1bd478496395b797ddbe5c0
Publikováno v:
Journal of Electromagnetic Engineering and Science, Vol 19, Iss 4, Pp 272-278 (2019)
This paper presents an evaluation method for a 1 mm coaxial calibration kit that can be used from DC to 110 GHz. The analytical model for the calibration kit was revisited and verified by comparing it with the electromagnetic High-Frequency Structure
Externí odkaz:
https://doaj.org/article/a0bd24a888ca4dbaabb766d64f119912
Publikováno v:
IEEE Access, Vol 7, Pp 159724-159730 (2019)
In this paper, we describe a traceable measurement method for the frequency response of commercial real-time digital oscilloscopes (RTDOs). Since the commercial RTDOs usually use multiple analog digital convertors (ADCs), it is very challenging to ch
Externí odkaz:
https://doaj.org/article/ad1a3eb2ad9f47d5afb266d9c4204d65
Publikováno v:
Measurement + Control, Vol 54 (2021)
In this paper, the propagation of uncertainty on a nonlinear measurement model is presented using a higher-order Taylor series. As the derived formula is based on a Taylor series, it is necessary to compute the partial derivatives of the nonlinear me
Externí odkaz:
https://doaj.org/article/e1f964b7c46b40fba538c03ed988328c
Publikováno v:
Measurement + Control, Vol 53 (2020)
In this paper, we present calibration and uncertainty evaluation methods for the phase of a radio-frequency comb generator using a calibrated sampling oscilloscope. In addition, we present many solutions that are indispensable for the precise calibra
Externí odkaz:
https://doaj.org/article/491bf141a1214199853b2629e5e5d9f3
Publikováno v:
Journal of the Korean Institute of Electromagnetic Engineering and Science, Vol 18, Iss 3, Pp 169-174 (2018)
In this paper, we propose an estimation method using multiple in-phase and quadrature (IQ) signals of different frequencies to evaluate the sample-time errors in the sampling oscilloscope. The estimator is implemented by ODRPACK, and a novel iteratio
Externí odkaz:
https://doaj.org/article/362a7973962e4dcca1b79d6cc2170744
Publikováno v:
Journal of Electromagnetic Engineering and Science, Vol 21, Iss 2, Pp 165-165 (2021)
Externí odkaz:
https://doaj.org/article/a139774bb9a644e79b1d6dbc50b9739b
Autor:
Joo-Gwang Lee
Publikováno v:
2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz).
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::eb5aa6ea927e306ec3ec6f6518abe76f
https://doi.org/10.1109/irmmw-thz50927.2022.9895999
https://doi.org/10.1109/irmmw-thz50927.2022.9895999
Publikováno v:
Measurement + Control, Vol 54 (2021)
In this paper, the propagation of uncertainty on a nonlinear measurement model is presented using a higher-order Taylor series. As the derived formula is based on a Taylor series, it is necessary to compute the partial derivatives of the nonlinear me
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::60247c140244568ead99301542abbb39
https://doi.org/10.1177/0020294021989740
https://doi.org/10.1177/0020294021989740