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휴대 단말기용 MIMO 안테나의 격리도 향상에 관한 연구
윤인섭,염효가,김상욱,조윤현,박효달,Yoon, In-Seop,Yan, Xiao-Jia,Kim, Sang-Uk,Jo, Yun-Hyun,Park, Hyo-Dal 한국전자통신학회 2015 한국전자통신학회 논문지 Vol.10 No.9
본 논문에서는 neutralization line 구조를 이용하여 안테나 간의 격리도를 향상시킨 MIMO 안테나 구조를 설계하였다. 제안된 MIMO 안테나 구조의 크기는 $116mm{\times}64mm{\times}5mm$이며, ${\varepsilon}r=4.4$인 FR-4 유전체를 사용하여 설계하였다. 또한 두 안테나 간의 격리도를 확보하기 위해 neutralization line을 추가하였다. 측정결과는 VSWR 3:1 기준으로 LTE B13 대역을 만족시켰고, 격리도를 -15 dB 이하로 확보하였다. H-평면에서 전방향성 방사특성을 나타내었으며, LTE B13 대역에서 -2.61 dBi에서 -1.18 dBi까지의 이득과 33.49 %에서 46.45 %까지의 방사효율을 얻었다. 측정결과와 시뮬레이션 결과를 비교하여 제안된 MIMO 안테나는 이동통신 휴대 단말기에 적용 가능함을 확인할 수 있다. In this paper, neutralization line structure have been employed to improve the isolation between the MIMO antenna system. The proposed MIMO antenna size is $116mm{\times}64mm{\times}5mm$ and designed on FR-4(${\varepsilon}r=4.4$) ground substrate. Neutralization line was applied to enhance isolation between the each antenna elements. The fabricated antenna satisfied a VSWR below 3 in LTE band B13 and the isolation between the MIMO antenna system is presented below -15dB. On the H-plane, antenna shows an omnidirectional pattern. In LTE band B13, the antenna presents a gain of a -2.6dBi ~-1.18dBi and radiation efficiency of 33.49% ~ 46.45%. Comparing measurement result with the outcome of simulation, the proposed MIMO antenna is expected to be applied for mobile application.
윤인섭 ( En Sup Yoon ),장남진 ( Nam Jin Jang ),단승규 ( Seung Kyu Dan ),신동일 ( Dong Il Shin ),이기백 ( Gi Baek Lee ) 한국화학공학회 2013 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.51 No.2
Sustainability, in general, means the protection of environmental resources and economic prosperity, with the consideration of the social, economic and environmental effect, as well as human health and the enhancement of life. Profound consideration about sustainability has to handle the overall cycle of feedstock, resource extraction, transportation and production in addition to the environmental effect. Sustainable development of the chemical industries should be carried out complementarily by strengthening the chemical process safety of the industries. In this respect, chemical process safety can be called an opportunity to enhance the compatibility internationally. Changing new paradigm in chemical process safety is formed from the overall life cycle considering basic design of existing systems and production processes. To improve the chemical process safety, the integrated smart system is necessary, comprising various chemical safety database and knowledge base and improved methods of quantitative risk analysis, including management system. This paper discussed the necessity of overall life cycle in chemical process safety and proposed new technology to improve the sustainability. To develop the sustainable industries in process systems engineering, three S, which include Safety, Stability and Security, will have to be combined appropriate.
윤인섭(In Seop Yoon),김선배(Sun Bae Kim) 한국자기학회 2015 韓國磁氣學會誌 Vol.25 No.5
Fe compounds of volcanic basalt samples distributed at the Hantan riverside in Cheorwon were investigated by means of X-ray diffractometry (XRD), X-ray fluorescence spectroscopy (XRF) and Mossbauer spectroscopy. We found that samples were typical basic rock which consisted of augite, anorthite, albite and sanidine etc. They had the total amount of iron compounds including hematite (α-Fe₂O₃) varies from 6.20 w% to 12.8 w% depending on the different regions by XRF. The Mossbauer spectra of the samples were consisted of three doublets. The balance state of Fe ions of all samples were chiefly Fe<SUP>2+</SUP>, and Fe<SUP>2+</SUP>/Fe<SUP>3+</SUP> ratios were 2.27~3.42.
윤인섭(In Seop Yoon) 한국자기학회 2010 韓國磁氣學會誌 Vol.20 No.4
Magnetic properties of basic rocks samples distributed in the seaside area of Ulleung island were investigated by means of X-ray fluorescence spectroscopy (XRF), Mossbauer spectroscopy and SQUID magnetometer. We found that samples were typical basic rock which had the total amount of iron compounds varies from 10.6 wt% to 14.5 wt% depending on the different regions by XRF. The Mossbauer spectra and magnetic hysteresis behaviors of the samples show ferromagnetic properties due to hematite. Also, temperature dependences of magnetization at applied magnetic field of 1 T for samples show magnetic transitions at 41 K~60 K.
윤인섭(In Seop Yoon),김선배(Sun Bae Kim),김형상(Hyungsang Kim) 한국자기학회 2010 韓國磁氣學會誌 Vol.20 No.3
Fe compounds of volcanic rock samples distributed in the seaside area of Ulleung island were investigated by means of X-ray diffractometry (XRD), X-ray fluorescence spectroscopy (XRF) and Mossbauer spectroscopy. We found that samples were typical basic rock which had the total amount of iron compounds including hematite (α-Fe₂O₃) varies from 10.6 w% to 14.5 w% depending on the different regions by XRF. The Mossbauer spectra of the samples were consisted of one sextet due to hemitite and doublets due to Fe<SUP>3+</SUP> in various clay mineral and Fe<SUP>2+</SUP> in pyroxene (Ca,Fe,Mg)₂(SiO₄)₂, ilmenite (FeTiO₃) and olivine (Mg,Fe)₂SiO₄. The balance state of Fe ions of all samples was chiefly Fe<SUP>3+</SUP>, so we could find that the volcanic rocks distributed in the seaside area of Ulleung island were made in inland.
Mössbauer 분광법에 의한 Ni<SUB>1 − x</SUB>Mg<SUB>x</SUB>Fe₂O₄ Ferrite의 자기구조 연구
윤인섭(In Seop Yoon),백승도(Seung Do Baek) 한국자기학회 2009 韓國磁氣學會誌 Vol.19 No.3
Ni<SUB>1 ? x</SUB>Mg<SUB>x</SUB>Fe₂O₄ ferrite system was studied by using X-ray diffraction and Mossbauer spectroscopy. The samples were prepared by ceramic sintering method with Mg content x .The X-ray diffraction patterns of samples show phase of cubic spinel structure. There are no remarkable changes of lattice constants in Ni<SUB>1 ? x</SUB>Mg<SUB>x</SUB>Fe₂O₄ ferrite system. The Mossbauer spectra were consisted of two sets of six lines, respectively, corresponding to Fe<SUP>3+</SUP> at tetrahedral and octahedral sites. The magnetic hyperfine field of samples was decreased as increasing Mg contents x in both sites and it was shown Yafet-Kittel magnetic structure. NiFe₂O₄ was shown complete inverse spinel, but MgFe₂O₄ was shown partial inverse spinel which absorption area ratio (oct/tet) was 1.449 in Mossbauer spectrum.