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Phase separations in graded-indium content InGaN/GaN multiple quantum wells and its function to high quantum efficiency

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Journal of Semiconductors 2012年第5期33卷 13-16页

作者：郭洪英孙元平 Yong-Hoon Cho eun-kyung suh Hai-Joon Lee Rak-Jun Choi Yoon-Bong Hahn Institute of Science and Technology for Opto-Electronic Information Yantai University Department of Physics Korea Advanced Institute of Science and Technology School of Semiconductor and Chemical Engineering Semiconductor Physics Research CenterChonbuk National University School of Chemical Engineering Chonbuk National University

Phase separations have been studied for graded-indium content In_xGa_（1-x）N/GaN multiple quantum wells（MQWs） with different indium contents by means of photoluminescence（PL）,cathodeluminescence（CL） and time-resolved PL（TRPL） *** the main emission peaks,all samples show another 2 peaks at the high and low energy parts of the main peaks in PL when excited at 10 *** images show a clear contrast for 3 samples,which indicates an increasing phase separation with increasing indium *** spectra at 15 K of the main emissions show an increasing delay of rising time with indium content,which means a carrier transferring from low indium content structures to high indium content structures.

关键词： carrier transfer phase separation graded-indium content multiple quantum wells

Quantitative analysis of mechanical properties associated with aging treatment and microstructure in Mg-Al-Zn alloys through machine learning

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Journal of Materials Science & Technology 2022年第12期107卷 52-63页

作者： Joung Sik suh Byeong-Chan suh Sang eun Lee Jun Ho Bae Byoung Gi Moon Advanced Metals Division Korea Institute of Materials ScienceChangwon 51508Republic of Korea

The present study proposes a methodology for predicting the mechanical properties of AZ61 and AZ91alloys associated with microstructure,texture and aging parameters and estimating predictor *** this,we investigate quantitative correlations between microstructure,texture and mechanical properties of aged AZ61 and AZ91 rods through machine *** regression analysis focuses on the precipitation behavior of Mg17Al12as the main second phase of Mg-Al-Zn alloys with respect to aging *** simplify data generation,only SEM images were used to quantify the features of discontinuous and continuous *** overcome the lack of data and make the most of the measured data,we devised a method to extend the existing dataset by a factor of 9 using the mean and standard deviation of the measured *** neural networks predicted tensile and compressive yield strengths and resultant yield asymmetry with a high accuracy of over 98%using 11 predictors for a total of *** tree learning quantitatively assessed the importance of predictors in determining the mechanical properties of aged AZ61 and AZ91 rods.

关键词： Magnesium alloy Aging treatment Microstructure Mechanical properties Machine learning

Possibility of Solid Hydrometeor Growth Zone Identification Using Radar Spectrum Width

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Advances in Atmospheric Sciences 2023年第2期40卷 317-332页

作者： Sung-Ho suh eun-Ho CHOI Hong-Il KIM Woonseon JUNG Flight Safety Technology Division NARO Space CenterKorea Aerospace Research Institute(KARI)508 Haban-roBongrae-myeonGoheung-gunJeollanam-do 59571Republic of Korea Research Applications Department National Institute of Meteorological Sciences33Seohobuk-roSeoqwipo-siJeju-do 63568Republic of Korea

In this study,the correlation between simulated and measured radar velocity spectrum width(σ_(v))is *** results show that the dendrites growth zones(DGZs)and needles growth zones(NGZs)mostly contain dendrites(DN)and needles(NE),***σ_(v) zones(1.11.2 m s^(-1),a differential reflectivity(ZDR)higher than 0 dB,and a cross-correlation coefficient(ρhv)less than *** contrast,prolate particles with relatively uniform shapes were observed in the NGZ withσ_(v)<0.6 m s^(-1),a ZDR less than 0 dB,andρhv higher than *** simulation results show that the DN exhibited a largerσ_(v) compared to the NE,and this observedσ_(v) was strongly dependent on the wind fluctuations(v’)due to turbulence or wind *** contrast,the NE exhibited a significantly smallσ_(v)~0.55 m s^(-1),which converges irrespective of v’.In addition,a strong correlation between the measuredσ_(v) values at five radar elevation angles(θ=6.2°,9.1°,13.1°,19°,and 80°)and those simulated in this study confirmed the significance of the analysis results.

关键词： spectrum width weather radar aerodynamic properties dendritic growth zone hydrometeor classifications

A Study on Energy Saving Rate for Variable Speed Condition of Multistage Centrifugal Pump

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Journal of Thermal Science 2015年第6期24卷 566-573页

作者： Sang-Ho suh Rakibuzzaman kyung-Wuk Kim Hyoung-Ho Kim In Sik Yoon Min-Tae Cho Department of Mechanical Engineering Soongsil University Dooch Co. 295 Sagok-ri Jangan- Myeon Hwaseong-si Gyeonggi-do 445-942 South Korea

Centrifugal pumps are being widely used in many industrial and commercial *** of these pumps are being operated at constant speed but could provide energy savings through adjustable speed *** purpose of this study was to get the energy saving rates of the multistage centrifugal pump with variable speed *** this investigation an experimental set up of variable flow and pressure system was made to get energy saving rates and numerical analyses are applied to validate the pump *** energy saving and therefore the cost saving depends on the specific duty cycle of which the machine *** cycle is the proportion of time during which a component,device and system is *** duty cycle segmented into different flow rates and weighting the average value for each segment by the interval *** system was operated at 50%or less of the pump *** input power of the system was carried out by pump characteristics curve of each operating *** energy consumption was done by the product of specific duty cycle and the input power of the system for constant speed and variable speed drive *** total energy consumed for constant speed drive pump was 75,770 k *** and for variable speed drive pump was 31,700 k *** total energy saving of the system was 44,070 k *** or 58.16%***,this paper suggests a method of implementing an energy saving on variable-flow and pressure system of the multistage centrifugal pump.

关键词： Multistage Centrifugal Pump Performance Analysis Energy saving rate SST Model Duty Cycle

Inferior oblique weakening surgery on ocular torsion in congenital superior oblique palsy

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International Journal of Ophthalmology(English edition) 2015年第3期8卷 569-573页

作者： Jinho Lee Soh-Youn suh Ho-kyung Choung Seong-Joon Kim Department of Ophthalmology Seoul National University College of Medicine Seoul Artificial Eye Center Seoul National University Hospital Clinical Research Institute Department of Ophthalmology Seoul Municipal Government-Seoul National University Boramae Medical Center

AIM: To investigate changes in fundus excyclotorsion after inferior oblique myectomy or myotomy. METHODS: The records of 21 patients undergoing strabismus surgery by a single surgeon between 2009 and 2012 were examined. Only patients who had undergone an inferior oblique myectomy or myotomy,with or without horizontal rectus muscle surgery, were evaluated. Digital fundus photographs were obtained,and the angle formed by a horizontal line passing through the optic disc center and a reference line connecting the foveola and optic disc center was measured. Associated clinical factors examined include age at the time of surgery, presence or absence of a head tilt, degree of preoperative vertical deviation,torsional angle, inferior oblique muscle overaction/superior oblique muscle underaction, and surgery laterality. Whether the procedure was performed alone or in combination with a horizontal rectus muscle surgery was also examined. RESULTS: Mean preoperative torsional angle was12. 0 ± 6. 4 °, which decreased to 6. 9 ± 5. 7 ° after surgery(P <0.001, paired t-test). Torsional angle also decreased from 15. 1 ± 7. 0 ° to 6. 2 ± 4. 3 ° in the myectomy group(P <0.001, paired t-test) but there were no significant changes in the myotomy group(P =0.093, Wilcoxon signed rank test). Multivariable linear regression analysis showed that preoperative torsional angle, degree ofinferior oblique overaction, and age at surgery independently and significantly affected postoperative torsional ***: Mean torsional angle decreased after inferior oblique myectomy. Degree of preoperative torsional angle, inferior oblique overaction, and age at surgery influence postoperative torsional angle.

关键词： oculomotor muscles strabismus superior oblique palsy torsion abnormality

High Strength Steel Plates for Large Container Ships

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Journal of Iron and Steel Research International 2011年第S1期18卷 796-802页

作者： Chang-Sun Lee Sangho Kim In-Shik suh kyung-Keun Um Ohjoon Kwon Technical Research Labs POSCOGoedong-dongNam-guPohang790-785Republic of Korea Research Institute of Industrial Science and Technology Hyoja-dongNam-guPohang790-600Republic of Korea

Heavy thickness steel plates with a good combination of strength,toughness and weldability have been demanded for building of large container *** strength steel plates with heavy gauge of EH36,EH40 and EH47 grades were developed by optimizing chemical compositions and TMCP process *** alloying elements of Ti and Nb were added to the three steel grades for enhancing the strength and toughness of base *** strength of base plates of the EH47 grade was further enhanced with the help of the increased amount of substitutional solid solutes,such as manganese,copper,nickel,or ***36 steel plates for high heat input over 550 kJ/cm were manufactured by improving thermal stability of TiN particles for better weld heat-affected zone *** stabilized TiN particles effectively suppress grain growth at weld heat-affected zone,leading to better *** steel plates showed excellent mechanical properties of base plates and welded joints.

关键词： EH36 EH40 EH47 container ship high heat input welding weldability

Calcium-dependent proteasome activation is required for axonal neurofilament degradation

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Neural Regeneration Research 2013年第36期8卷 3401-3409页

作者： Joo Youn Park So Young Jang Yoon kyung Shin Duk Joon suh Hwan Tae Park Department of Physiology Mitochondria Hub Regulation Center College of Medicine Dong-A University

Even though many studies have identified roles of proteasomes in axonal degeneration, the mo- lecular mechanisms by which axonal injury regulates proteasome activity are still unclear. In the present study, we found evidence indicating that extracellular calcium influx is an upstream regulator of proteasome activity during axonal degeneration in injured peripheral nerves. In degenerating axons, the increase in proteasome activity and the degradation of ubiquitinated proteins were sig- nificantly suppressed by extracellular calcium chelation. In addition, electron microscopic findings revealed selective inhibition of neurofilament degradation, but not microtubule depolymerization or mitochondrial swelling, by the inhibition of calpain and proteasomes. Taken together, our findings suggest that calcium increase and subsequent proteasome activation are an essential initiator of neurofilament degradation in Wallerian degeneration.

关键词： neural regeneration peripheral nerve injury neurofilament degradation sciatic nerve calcium calpain mitochondria microtubule depolymerization axon axon degeneration neuroregeneration

OsWRKY65 enhances immunity against fungal and bacterial pathogens in rice

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The Crop Journal 2024年第2期12卷 470-481页

作者： Seungmin Son Giha Song suhyeon Nam Jinjeong Lee Duk-Ju Hwang eun-Jung suh Sang Ryeol Park National Institute of Agricultural Sciences Rural Development AdministrationJeonju 54874Republic of Korea Department of Agriculture Forestry and BioresourcesPlant Genomics and Breeding InstituteResearch Institute of Agriculture and Life SciencesSeoul National UniversitySeoul 08826Republic of Korea Department of Crop Science and Biotechnology Jeonbuk National UniversityJeonju 54896Republic of Korea

Diverse bacterial and fungal pathogens attack plants,causing biotic stress and severe yield losses *** losses are expected to become more serious as climate change improves conditions for many ***,identifying genes conferring broad-spectrum disease resistance and elucidating their underlying mechanisms provides important resources for plant *** transcription factors affect plant growth and stress ***,the functions of many WRKY proteins remain to be ***,we demonstrated the role of rice(Oryza sativa)WRKY groupⅢtranscription factor OsWRKY65 in ***65 localized to the nucleus and acted as transcriptional *** and molecular functional analyses showed that OsWRKY65 increases resistance to the fungal pathogen Fusarium fujikuroi through downregulation of GA signaling and upregulation of JA ***,OsWRKY65 modulated the expression of the key genes that confer susceptibility or resistance to Xanthomonas oryzae *** to enhance immunity against the *** particular,OsWRKY65directly bound to the promoter region of OsSWEET13 and repressed its *** together,our findings demonstrate that the OsWRKY65 enhances resistance to fungal and bacterial pathogens in rice.

关键词： Bacterial blight Bakanae disease Broad-spectrum disease resistance Oriza sativa OsWRKY65 Rice

Effect of gadolinium incorporation on optical characteristics of YNbO_4:Eu^(3+) phosphors for lamp applications

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Journal of Rare Earths 2012年第3期30卷 205-209页

作者： Sung Hwan Choi G. Anoop Dong Wook suh kyung Pil Kim Hyun Ju Lee Jae Soo Yoo Display Materials Laboratory School of Chemical Engineering and Materials Science Chung-Ang University

Eu3＋-doped （Y,Gd）NbO4 phosphor was synthesized by solid-state reaction for possible application in cold cathode fluorescent lamps. A broad absorption band with peak maximum at 272 nm was observed which was due to the charge transfer between Eu3＋ ions and neighboring oxygen anions. A deep red emission at the peak wavelength of 612 nm was observed which could be attributed to the 5D0→7F2 transition in Eu3＋ ions. The highest luminance for Y1-x-yGdyNbO4：Eux3＋ under 254 nm excitation was achieved at Eu3＋ concentration of 18 mol.% （x=0.18） and Gd3＋ concentration of 8.2 mol.% （y=0.082）. The luminance of Y0.738Gd0.082NbO4：Eu3＋0.18 was higher than that of a typical commercial phosphor Y2O3：Eu3＋ and the CIE chromaticity coordinate was （0.6490, 0.3506）, which was deeper than that of Y2O3：Eu3＋. The particle size of the synthesized phosphors was controlled by the NaCl flux and particle size as high as 8 μm with uniform size distribution of particles was obtained.

关键词： YNbO4:Eu oxide phosphors rare earths