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민대홍,유근호,유영우,문승환,이규호,남옥현 한양대학교 세라믹연구소 2013 Journal of Ceramic Processing Research Vol.14 No.4
We report the improved crystal quality and optical property in (11-22) semipolar InGaN/GaN light emitting diodes (LEDs) grown on hemi-spherically patterned SiO2 mask on m-plane sapphire substrate (HP-SiO2) compared with the m-plane sapphire substrate (m-planar), using metalorganic chemical vapor deposition (MOCVD). The photoluminescence (PL) results showed that the integrated intensity of the near band edge (NBE) emission of the GaN layer grown on HP-SiO2 was increased by 3 times as high as that of m-planar. The full width at half maximums (FWHMs) of X-ray rocking curves for the on- and off-axis planes of the GaN layers on HP-SiO2 were narrower down than on m-planar, which indicates that the crystal quality of the semipolar GaN layers on HP-SiO2 was considerably improved as compared with that on m-planar by reducing defects such as perfect/partial dislocations and basal stacking faults. Cross- sectional transmission electron microscopy (TEM) images also showed the reduction of dislocation density in GaN layers on HP-SiO2 than on m-planar. The optical power of InGaN/GaN LEDs with HP-SiO2 was increased by 1.7 and 7.3 times at injection current of 20 mA and 100 mA, respectively, in comparison with the m-planar LEDs.
閔大弘 大韓成形外科學會 1994 Archives of Plastic Surgery Vol.21 No.1
In order to observe the mechanism of autoregulation of blood flow in the isolated rabbit kidneys, 20 rabbits served as the normal control of which kidneys were perfused with blood obtained from donor rabbits. In 18 rabbits kidneys were decapsulated and perfused with blood, In 5 rabbits intact kidneys were perfused with a balanced perfusate. From the perfusion studies in earth group, phenomenon of autoregulation was observed were as follows. 1) The autoregulation was maintained for 30 min, from the onset of perfusion, thereafter deterioration rapidly. Data cited in this article were those obtained at 30 minutes. from onset of perfusion. 2) The weight of kidney after perfusion experienment increased about 3.2% in the group, 6.6% in the second group. But there were no increase in the third group. 3) The autoregulation of renal flow was observed in every group and autoregulation zone was ranged between 110 and 190 mmHg. 4) The mean renal flows at autoregulation zone were about 1.25ml/min/gm in the first and second group and about 6.0ml/min/gm in the third group. 5) Intra renal vascular resistance increased proportionately as perfusion pressure was increased within therange of autoregulation in every group but rather decreased at the out of range of autoregulation. From the above data, nechanism of autoregulation in the rabbit kidney was discussed.
花崗岩土 開田地의 浸蝕-堆砂實態와 土砂收支에 對한 考察
閔大泓 公州大學校 資源科學硏究所 1994 資源科學硏究論文集 Vol.2 No.-
In this study, gully erosion and sedimentation on reclaimed land of decomposed granite soil were surveyed. The results were as follows. It was observed that sedimentation form of washed soil is different each other according to the layout and gradient of drainage channel or the structure and capaciety of sedimentation facilities. The efficient method to control soil which is washed out from the field is to construct the catch channel and use it as a sedimentation space. Constructing the horizontal channel crossing the field, the amount of gully erosion was decreased and washed soil was also decreased. It is effective method that the soil sedimentation facilities is constructed as a shape of rectangle, and sedimentation basin must be constructed in order that soil gravel is sedimented very well and washed water do not flow to the direction of spillway. The data of soil erosion and sedimentation in short time is necessary to solve the problem of reclaimed land in the granite soil zone.