Zobrazeno 1 - 10
of 41
pro vyhledávání: '"Do Heung Je"'
Publikováno v:
Journal of Astronomy and Space Sciences, Vol 27, Iss 2, Pp 145-152 (2010)
In this paper, we developed a local oscillator (LO) system of millimeter wave band receiver for radio astronomy observation. We measured the phase and amplitude drift stability of this LO system. The voltage control oscillator (VCO) of this LO syst
Externí odkaz:
https://doaj.org/article/582ed42e903a478bbbe8e3e4af908113
Publikováno v:
Journal of Astronomy and Space Sciences, Vol 30, Iss 4, Pp 345-353 (2013)
A W-band Orthomode Transducer (OMT) has been developed for Korean VLBI Network (KVN) polarization observation. The OMT design was based on E-plane split-block technique using septum structure. 3-dimensional electromagnetic simulation was fully empl
Externí odkaz:
https://doaj.org/article/4bc70d8dbeab426b900ac2c3882e3b5e
Publikováno v:
Journal of Astronomy and Space Sciences, Vol 27, Iss 3, Pp 239-244 (2010)
A simulation for the design of a 90o differential phase shifter aimed toward Korean VLBI Network (KVN) 129 GHz band polarizer is described in this paper. A dual-circular polarizer for KVN 129 GHz band consists of a 90o differential phase shifter an
Externí odkaz:
https://doaj.org/article/6e83dd4563a143a4b39b39ae5f8004aa
Publikováno v:
Journal of Astronomy and Space Sciences, Vol 26, Iss 3, Pp 345-354 (2009)
A stepped septum polarizer has been designed and fabricated for the 43 GHz band KVN receiver system. The dual-circular polarizer converts left and right hand circularly polarized signals into linear polarizations in two separated rectangular waveguid
Externí odkaz:
https://doaj.org/article/5c48550a80eb425e9cf0047ac44d72eb
Autor:
Do-Heung Je, Seog-Tae Han, Tae-Sung Kim, Hyun-Joo Kim, Kang-Dong Kim, Moon-Hee Chung, Chang-Hoon Lee, Duk-Goo Roh
Publikováno v:
Journal of Astronomy and Space Sciences, Vol 21, Iss 1, Pp 29-38 (2004)
A ultra low noise Q-band HEMT receiver for VLBI has been developed using a local oscillator with a very high phase stability. The performance of receiver was verified by comparison with receivers which were developed at the other countries. The recei
Externí odkaz:
https://doaj.org/article/ad08c1246956489cbad06239a46d5c95
Autor:
Seog-Tae Han, Jung-Won Lee, Moon-Hee Chung, Seog-Oh Wi, Bangwon Lee, Paul F. Goldsmith, Sung-Mo Lee, Do-Heung Je
Publikováno v:
Journal of Infrared, Millimeter, and Terahertz Waves. 38:1487-1501
A novel receiver optical system designed for Korean VLBI Network (KVN) has been used for conducting simultaneous millimeter-wave very long baseline interferometry (VLBI) observations at frequencies of 22, 43, 86, and 129 GHz. This multi-frequency ban
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::18346389f2e8edcbcbe3149a15b949f9
https://doi.org/10.1007/s10762-017-0438-2
https://doi.org/10.1007/s10762-017-0438-2
Publikováno v:
The Journal of Korean Institute of Electromagnetic Engineering and Science. 26:851-868
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::75813f595758bcd97513dffe13872905
https://doi.org/10.5515/kjkiees.2015.26.10.851
https://doi.org/10.5515/kjkiees.2015.26.10.851
Publikováno v:
The Journal of Korean Institute of Electromagnetic Engineering and Science. 24:1215-1218
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1722cb41710b02f23e875452490a447b
https://doi.org/10.5515/kjkiees.2013.24.12.1215
https://doi.org/10.5515/kjkiees.2013.24.12.1215
Autor:
Minkyu Song, Do-Young Byun, Moon-Hee Chung, Won-Kyu Lee, Seog-Oh Wi, Do-Heung Je, Seog-Tae Han, Yong-Woo Kang, Taehyun Jung, Seung-Rae Kim, Bong Won Sohn, Soo-Yeon Kim
Publikováno v:
Publications of The Korean Astronomical Society. 28:95-100
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9f148944fdcd10b3fea9be51466aaf89
https://doi.org/10.5303/pkas.2013.28.3.095
https://doi.org/10.5303/pkas.2013.28.3.095
Publikováno v:
Journal of Astronomy and Space Sciences, Vol 30, Iss 4, Pp 345-353 (2013)
A W-band Orthomode Transducer (OMT) has been developed for Korean VLBI Network (KVN) polarization observation. The OMT design was based on E-plane split-block technique using septum structure. 3-dimensional electromagnetic simulation was fully employ
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d1ad893a632f36ead243a159979c6cde
http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2013/v30n4/OJOOBS_2013_v30n4_345.pdf
http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2013/v30n4/OJOOBS_2013_v30n4_345.pdf