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우리나라 전파환경에 적합한 개선된 전파 예측 시뮬레이터 개발
이호범(Ho-Bum Lee),이일근(Ill-Keun Rhee) 한국정보기술학회 2010 한국정보기술학회논문지 Vol.8 No.12
This paper proposes a new radio-wave propagation prediction simulator which is based on the Rec. ITU-R P. 452-14 and the correction factor extracted from comparison data between simulation result of Rec. ITU-R P.452-14 and interference measured in specific Korean territory. This paper also shows the superiority of the developed simulator by analyzing received signal power patterns of Rec. ITU-R. P.452-12-based simulator and our simulator. Furthermore, this paper suggests that our simulator is useful to save time and cost for design and operation of the wireless systems, by showing a couple of illustrative our simulator application examples regarding parameter selection of a new wireless system and received signal power variation with respect to the system parameters.
수렴성빔 전자회절법을 이용한 리오캐스팅시킨 과공정 Al-Si합금에서 실리콘초정의 격자상수 측정
이정일,김긍호,이호인,Lee, Jung-Ill,Kim, Gyeung-Ho,Lee, Ho-In 한국현미경학회 1995 Applied microscopy Vol.25 No.3
The morphological changes of primary solid particles as a function of process time on hypereutectic Al-15.5wt%Si alloy during semi-solid state processing with a shear rate of $200s^{-1}$ are studied. In this alloy, it was observed that primary Si crystals are fragmented at the early stage of stirring and morphologies of primary Si crystals change from faceted to spherical during isothermal shearing for 60 minutes. To understand the role of Al dissolved in the primary Si crystal by shear stress at high temperature, lattice parameters of the primary Si crystals are determined as a variation of high order Laue zone(HOLZ) line positions measured from convergent beam electron diffraction(CBED) pattern. The lattice parameter of the primary Si crystal in the rheocast Al-15.5wt%Si alloy shows tensile strain of about 5 times greater than that of the gravity casting. Increase of the lattice parameter by rheocasting is due to the increased amount of Al dissolved in the primary Si crystal accelerated by shear stress at high temperature. The amounts of solute Al in the primary Si crystal are measured quantitatively by EPMA method to confirm the CBED analysis.
소의 theileriosis가 성장 hormone과 insulin-like growth factor-I에 미치는 영향
백병걸,변선윤,이존화,이호일,Baek, Byeong-kirl,Byoun, Sun-youn,Lee, John-wha,Lee, Ho-ill 대한수의학회 1997 大韓獸醫學會誌 Vol.37 No.2
Bovine theileriosis caused by Theileria sergenti is the tick-borne intraery- throcytic piroplasmosis, that occurs in most regions of Korea. It results in severe economic losses on a farm caused by anemia, milk production loss, abortion and death. This study was undertaken to confirm the effects of the growth hormone and the insulin-like growth factor-I which are associated in the growth of cattle infected by T sergenti. The blood of one hundred and twenty ten-month Holstein was collected and the prepared blood smear was stained with acridine orange to investigate their parasitemia. And the hematological profiles were observed. According to the value of the hematocrit, they were categorized into four groups : Group 1 was under 20 percent, groups 2 and 3 were from over 21 to under 30 percent and from over 31 to under 35 percent and group 4 was over 36 percent. As the value of the hematocrit decreased, parasitemia(%) in erythrocytes was observed to increase(Y=-1.064X + 30.537, r=0.660). The amounts of the growth hormone and the insulin-like growth factor-I in the serum were measured by the radioimmunoassay. The growth hormone in serum of the group 1, group 2, group 3 and group 4 were observed as $0.238{\pm}0.043nmol/l$, $0.21{\pm}0.024nmol/l$, $0.366{\pm}0.035nmol/l$ and $0.646{\pm}0.223nmol/l$, respectively. The quantitative of the insulin-like growth factor-I in the same groups were observed also as $209.686{\pm}18.94ng/ml$, $250.9{\pm}12.609ng/ml$, $279.3{\pm}8.883ng/ml$ and $365.9{\pm}22.45ng/ml$, respectively. It can be concluded that the growth hormone and the insulin-like growth factor-I were observed to decrease in severe anemia due to theileriosis.
Al-6.2wt.%Si 합금의 등온교반시간에 따른 미세조직변화
이정일,박지호,김긍호,이호인 ( Jung Ill Lee,Ji Ho Park,Gyeung Ho Kim,Ho In Lee ) 한국주조공학회 1995 한국주조공학회지 Vol.15 No.5
N/A The microstructural evolution with isothermal stirring during semi-solid state processing of hypoeutectic Al-6.2wt%Si alloy was studied. Substructure of the individual primary solid particle in the slurry was investigated through transmission electron microscopy(TEM). Formation of subgrain boundaries on the rheocast Al-6.2wt%Si alloy is observed and the misorientation between the grains is shown typically under 2 degrees by analyzing selected area diffraction (SAD) and convergent beam electron diffraction (CBED) patterns. The existence of high angle grain boundaries are also observed in the alloy. Based upon these observations, mechanisms for the primary particles fragmentation are considered. With isothermal stirring, the dislocation density increases, and the evolution of dislocation cell structure takes place, which is interpreted as a process of achieving uniform deformation by dynamic recovery under applied shear stress.
수렴성 빔 전자회절법을 이용한 $SiC_p/Al$ 복합재에서의 계면 생성물의 상분석
이정일,이재철,석현광,이호인,Lee, Jung-Ill,Lee, Jae-Chul,Suk, Hyun-Kwang,Lee, Ho-In 한국현미경학회 1996 Applied microscopy Vol.26 No.1
A comprehensive methodology to characterize the interfacial reaction products of $SiC_p/2024$ Al composites is introduced on the basis of the experimental results obtained using XRD, SEM and TEM. XRD performed on the electrochemically extracted $SiC_p$ and bulk $SiC_p/2024$ Al composite have shown that the interfacial reaction products consist of $Al_{4}C_3$ having hexagonal crystallographic structure, pure eutectic Si having diamond cubic crystallographic structure, and $CuAl_2$, having tetragonal crystalloraphic structure, respectively. According to the images observed by SEM, $Al_{4}C_3$, which has been reported to have needle shape, has a hexagonal platelet-shape and eutectic Si is found to have a dendritic shape. In addition eutectic $CuAl_2$, was observed to form near interface and/or along the grain boundaries. In order to confirm the results obtained by XRD, the primitive cell volume and reciprocal lattice height of such interfacial reaction products were calculated using the data obtained from convergent beam electron diffraction (CBED) patterns, and then compared with theoretical values.
우리나라 주변 환경에 적합한 지상망 전파 전파 모델 연구
김현주(Hyoun-Ju Kim),이일근(Ill-Keun Rhee),임현규(Hyun-Gyu Lim),송인자(In-Ja Song),이호범(Ho-Bum Lee),신종민(Jong-Min Shin) 한국정보기술학회 2006 Proceedings of KIIT Conference Vol.2006 No.-
본 논문에서는 ITD-R P. 452-11 권고 모델을 기반으로 하여, 우리나라 특정 지역이 들어오는 실제 간섭 전파의 전계강도와 비교를 통하여 적절한 파라미터의 보정 값을 추출하고 이를 활용하여 우리나라 주변 환경에서 적용할 수 있는 지상 업무를 위한 전파 전파 예측 모델을 도출하였다. 이렇게 얻어진 전파 예측 모델을 활용하여 얻어진 데이터와 실측 전파 간섭 량과의 비교를 통하여 이들이 매우 비슷한 패턴을 갖고 있는 것을 확인할 수 있었다. 또한 본 논문에서는 도출된 새로운 전파 예측 모델을 활용하여 무선국 설계를 위한 파라미터 조정 예를 보임으로써 실제 무선국 설계와 운용에 있어서 간섭 전파 측정과 하드웨어 구축에 드는 시간과 비용을 절감할 수 있음을 보였다. This paper proposes the modified wave propagation model that is based on ITU-R recommendation P452-11 and appends the gained correction that obtained by comparing the real interfered wave field strength at korea special area. The real interfered values was compared with obtained data by modified model and then between two values was similar pattern. Through the example of parameter settling for the establishment of radio station, the expense and the time about interfered wave measurement and hardware building will be reduced in the establishment and operation of real radio station.