Zobrazeno 1 - 10
of 32
pro vyhledávání: '"Hyeon-gyu Choi"'
Publikováno v:
IEEE Access, Vol 12, Pp 156893-156903 (2024)
This paper suggests a technique to reduce noise in DC current measurements within an integrated power conversion system, which includes a three-phase inverter and a full-bridge converter both utilizing single shunt resistors as current sensors. Typic
Externí odkaz:
https://doaj.org/article/78cab5fc8ab74d61a4ca61e9a2ecc6f3
Publikováno v:
IEEE Access, Vol 12, Pp 78959-78968 (2024)
This article presents a single current sensing method that achieves minimal current reconstruction errors, even at extremely low-speed region. In vector control applications, a drive system that combines single current sensor with position sensorless
Externí odkaz:
https://doaj.org/article/efc9c65016f442778baf7831fdb40437
Autor:
Shuvaraj Ghosh, Malkeshkumar Patel, Hyeon‐Gyu Choi, Sung‐Min Youn, Chaehwan Jeong, Joondong Kim
Publikováno v:
Advanced Electronic Materials, Vol 10, Iss 1, Pp n/a-n/a (2024)
Abstract BiVO4, a narrow bandgap material (2.5 eV), has been widely explored for photocatalytic applications, but its applications in the optoelectronic field are unexplored. This work explores BiVO4 for photovoltaic devices using the oxygen vacancie
Externí odkaz:
https://doaj.org/article/5416387906f642f39c47205f8716c1f6
Publikováno v:
Journal of the Korean Ophthalmological Society. 63:406-411
Purpose: To report a case of transient total occlusive attack of the ophthalmic artery with asymptomatic patent foramen ovale.Case summary: A 31‐year‐old female presented with worsening of intermittent visual loss in her right eye from the previo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::65b4d1860de9d170ea5ce4e5ea0e4991
https://doi.org/10.3341/jkos.2022.63.4.406
https://doi.org/10.3341/jkos.2022.63.4.406
Publikováno v:
IEEE Journal of Emerging and Selected Topics in Power Electronics. 9:259-273
This article proposes a method to extend the operating area of the interior permanent magnet synchronous machines (IPMSMs). In general, the power factor (PF) of the voltage source inverter becomes lower to maintain the maximum torque per ampere (MTPA
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f41917150c7690dee7ef3ea22c56667e
https://doi.org/10.1109/jestpe.2019.2958693
https://doi.org/10.1109/jestpe.2019.2958693
Publikováno v:
IEEE Transactions on Industrial Electronics. 67:10109-10120
This paper proposes a method to boost the terminal voltages using a capacitive network. The boosted voltage can improve the power capability of an interior permanent magnet synchronous motor (IPMSM). In the conventional drive system fed by a voltage-
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::49f2db53891ab4352252424ae5580a04
https://doi.org/10.1109/tie.2019.2962410
https://doi.org/10.1109/tie.2019.2962410
Publikováno v:
IEEE Transactions on Power Electronics. 35:3891-3905
This article proposes a method to extend the operating area of the surface permanent magnet motor by inserting the passive power networks between the motor and the voltage source inverter (VSI). In the conventional motor drive system, since the opera
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::adc7992b999611de69dde2da49c60f38
https://doi.org/10.1109/tpel.2019.2937333
https://doi.org/10.1109/tpel.2019.2937333
Autor:
Hyeon Gyu Choi, Jung-Ik Ha
Publikováno v:
Journal of Power Electronics. 20:501-510
It is difficult to use the conventional fixed sampling pulse-width modulation (PWM) method in a motor drive system due to the harmonics and beat phenomenon when the number of switchings is low. Synchronous PWM is a solution to overcome these problems
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::147c7649bbded33c1981642d488b972c
https://doi.org/10.1007/s43236-020-00038-2
https://doi.org/10.1007/s43236-020-00038-2
Autor:
Jeong F. Kim, You-In Park, Seung-Eun Nam, Young Mi Kim, Hosik Park, Young Hoon Cho, Hyeon-gyu Choi, Kim Sang Deuk
Publikováno v:
Journal of Membrane Science. 579:329-341
For osmotic power generation using the pressure retarded osmosis (PRO) process, mechanically robust membranes with high osmotic water flux are needed to obtain high power density from a given osmotic pressure difference. Particularly in the case of s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b5c8e1b58e57445c96ee8b74d1b6452f
https://doi.org/10.1016/j.memsci.2019.03.004
https://doi.org/10.1016/j.memsci.2019.03.004
Autor:
Young Hoon Cho, Hosik Park, Aatif Ali Shah, Seung-Eun Nam, Young Mi Kim, Hyeon-gyu Choi, Jeong F. Kim, You-In Park
Publikováno v:
Journal of Industrial and Engineering Chemistry. 73:276-285
In this study, new type of thin film nanocomposite (TFN) membrane with polysulfone (PSf) support layer having highly permeable interlayer using halloysite nanotubes (HNT) and hydrophilic polydopamine (pDA) was fabricated to improve the surface wettab
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1598903d9bf1e9cbf6ab54a07777189a
https://doi.org/10.1016/j.jiec.2019.01.039
https://doi.org/10.1016/j.jiec.2019.01.039