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이경준,박정훈,이문규 한국전자파학회 2023 한국전자파학회논문지 Vol.34 No.2
This paper proposes a modified vertically installed planar (VIP) coupler for wideband applications. The proposed 5 GHz unlicensed national information infrastructure (U-NII) band VIP coupler is composed of three via holes and RF patterns adjusting current paths of the coupled lines for the wideband characteristic. In measurements, the proposed VIP coupler exhibits 3-dB bandwidth at 2.67 GHz with a fractional bandwidth of 47.7 % and phase error within ±2.5° at a center frequency of 5.8 GHz.
韓國 8個造林樹種의 林分內의 外生菌根버섯의 分布에 關한 硏究
金養燮,李景俊 서울大學校農業生命科學大學附屬樹木園 1985 서울大學校 樹木園 硏究報告 Vol.- No.6
高等菌類中에서 外生菌根을 形成하는 菌根버섯의 寄主選擇性을 究明하기 爲하여, 全國 아홉個 場所를 對象으로 6月부터 10月까지 소나무林, 잣나무林, 낙엽송林, 젓나무林, 참나무林, 자작나무林, 포플러林, 밤나무林에서 菌根버섯을 採取하여 同定하고 서로 比較하였다. 8個 林分에서 總 35屬 133種의 菌根버섯을 採取하였는데 그 中 소나무林에서 19屬 39種 잣나무林에서 12屬 25種, 잎갈나무林에서 7屬 9種, 젓나무林에서 14屬 32種, 참나무林에서 13屬 29種, 자작나무林에서 7屬 10種, 포플러林에서 11屬 21種, 밤나무林에서 11屬 16種의 菌根버섯이 採集되었다. 가장 多樣한 菌根버섯을 生産하는 林分은 소나무林이었으며 가장 單純한 林分은 잎갈나무林이었다. 광대버섯類(Amanita), 무당버섯類(Russula), 졸각버섯類(Laccaria)는 모든 9個 場所에서 모든 林分에서 採集되어 가장 寄主의 範圍가 넓은 菌根버섯類이었으며 비단그물버섯類(Suillus)는 소나무科인 소나무林, 잣나무林, 잎갈나무林에서만 採集되었다. To understand the host specificity of ectomycorrhizal fungi, mushrooms occurring on the forest floor of pure stands of Pinus densiflora, Pinus koraiensis, Larix leptolepis, Abies holophylla, Quercus aliena, Betula platyphylla, Populus alba×glandulosa and Castanea crenata were collected for comparison. A total of 133 ectomycorrhizal species in 38 genera were collected, and following number of genera and species of putative ectomycorrhizal fungi were identified: 39 species in 19 genera from Pinus densiflora, 25 species in 12 genera from Pinus koraiensis, 9 species in 7 genera from Larix, 32 species in 14 genera from Abies, 29 species in 13 genera from Quercus, 10 species in 7 genera from Betula, 21 species in 11 genera from Populus, and 16 species in 11 genera from Castanea stands. The most diversified fungal flora was observed from Pinus densiflora, while Larix leptolepis had simplest flora. Among ectomycorrhizal fungi collected, Amanita, Russula and Laccaia were found in all the stands, suggesting broad host specificity of these genera. Suillus species were found in the four stands of Pinaceae, confirming limited association of Suillus with Pinaceae family only.
李璟埈 한국항공대학교 1970 論文集 Vol.1 No.-
What matters in regard to instrumentation is the temperature error. Particularly, in terms of the fact that an aircraft always accompanies the change of temperatures when it changes its flying altitude, the errors caused by the change of temperatures work considerably upon the aviation instruments. This paper intends to investigate the various phenomena regarding such errors as work upon the aviation instruments and to effect the adequate procedures for their compensation.
DS-CDMA/DPSK 셀룰라 이동통신 시스템에서 간섭 제거기와 RAKE 수신기에 의한 성능 개선
이경준,오창헌,조성준,채수환 대한전자공학회 1996 전자공학회논문지-A Vol.33 No.4
In this paper, we analyzed the performance improvement of the DS-CDMA/dPSK cellular mobile communication system with CCI canceller and RAKE receiver techniques in mobile radio channel which is characterized by AWGN, Multi-user interference (mUI) and frequency-selective rayleigh fading. System capacity i.e., number of user per cell has been derived and the evaluated results are shown in figuraes as a function of PN code sequence length, number of RAKE receiver tap, BER and E$_{b}$/N$_{o}$. The voice activity factor is assumed to be 3/8 the number of sectors in a cell 3 and MUI is modeled as gaussian process. From the results, the capacity of the DS-CDMA/DPSK cellular mobile communication system is improved by adopting CCI canceller. When we adopt the RAKE receiver to mitigate the multipath fading, the error performance is improved and the amount of improvement is proportional ot the number of taps L in the case that each tap contains a signal component and the better of improvement can be obtained, the smaller of the SNR difference in each tap. The system capacity is more increased when the CCI canceller and the RAKE receiver is used in cascade.