Y/Gd-free yellow Lu₃Al₅O₁₂:Ce³⁺ phosphor for white LEDs

Park, K.,Kim, T.,Yu, Y.,Seo, K.,Kim, J. Elsevier [etc.] 2016 Journal of luminescence Vol.173 No.-

<P>Solid solubility limit of Ce3+ ions into Lu-based garnet, Lu3(1-x)Ce3xAl5O12, was determined as below 6.7 mol% (3x < 0.2 mol) through Raman spectra and X-ray diffraction patterns. Above the solid solubility limit (3x >= 0.2 mol), Lu3((1-x))Ce(3x)Al(5)O(12) phosphors showed the significant redshift to the yellow spectral region without Y3+ and Gd3+ ions. The redshift was explained in terms of the local compressive strain at the Ce3+ sites. The optimized sample (3x=0.4 mol) had a dominant emission wavelength of 548 nm, color coordinate of CIEx=0.421, CIEy=0.548, quantum efficiency of 80%, absorbance of 91%, lumen maintenance of 90% and high color stability at 473 K under 450 nm excitation wavelength, suggesting substitutability for the commercial yellow (Y, Gd)(3)(Al, Ga)(5)O-12:Ce3+ phosphor. The measured decay times at higher Ce3+ concentration are significantly shortened at higher temperature than that of those at lower Ce3+ concentration. The yellow Lu2.6Ce0.4Al5O12 and a commercial red (Sr, Ca)AlSiN3:Eu2+ phosphor were applied to the pc-WLED, it gave an excellent luminous efficiency (138 lm/W) with a slightly lower color rendering index (Ra =76.4) under correlated color temperature of 6500 K compared to those of the (Y, Gd)(3)(Al, Ga)(5)O-12:Ce3+-based one (136 lm/W, Ra =78.7). Especially, the quantities of the used phosphors were significantly decreased by 20% for the yellow LuAG:Ce and by 40% for the red (Sr, Ca)AlSiN3:Eu2+. Thus, the Y/Gd-free pure LuAG:Ce yellow phosphors can be used as alternative to the commercial yellow YAG:Ce phosphor. (C) 2016 Elsevier B.V. All rights reserved.</P>

고온기 초지의 예취관리에 관한 연구 6 . 고온기간중 예취높이와 질소 및 칼리추비가 혼파초지의 식생과 수량 및 목초품질에 미치는 영향

서성(S . Seo),조무환(M . H . Jo),박문수(M . S . Park),이종경(J . K . Lee),한영춘(Y . C . Han) 한국축산학회 1988 한국축산학회지 Vol.30 No.8

A field experiment was carried out to determine the effects of cutting height at the third cut and application of N and K₂O after cutting during mid-summer season on the soil temperature, plant height, grass coverage, percentages of grass and legume, yield and grass quality in orchardgrass dominated pasture. With three cutting heights (3, 6 and 9㎝) and 4 fertilizer levels (0, N 50㎏, K₂O 50㎏, and N 50㎏ + K₂O 50㎏ ㏊^(-1)), present experiment was conducted at Livestock Experiment Station, Suwon in 1987. 1. The soil temperature after the third cut was rapidly elevated, and lower value was observed with 9㎝ of cutting height through the regrowth period. Plant height after cutting was remarkably increased with higher stubble height regardless of fertilizer levels. 2. The grass coverage and percentage of grass were increased as stubble height was high, while the influence of fertilizer on those was very little. Application of N and K₂O with lower stubble height significantly increased the percentage of bareland. 3. The yield at the third cut was decreased with higher height. But the regrowth yield was significantly increased as the cutting height was increased regardless of fertilizer levels. Regrowth yield was great at N 50㎏ + K₂O 50㎏ $gt; 0 $gt; K₂O 50㎏, N 50㎏, in that order. However, there were not significantly different on regrowth yield among fertilizer treatment. 4. The contents of crude protein, crude fat, crude ash, P, K and Ca were decreased as stubble height was high, and that of crude fiber was increased at 9 ㎝ cutting height. Also the influence of N and K₂O fertilizer on grass quality was little.

TMEM175 Is an Organelle K⁺ Channel Regulating Lysosomal Function

Cang, C.,Aranda, K.,Seo, Y.j.,Gasnier, B.,Ren, D. Cell Press ; MIT Press 2015 Cell Vol.162 No.5

Potassium is the most abundant ion to face both plasma and organelle membranes. Extensive research over the past seven decades has characterized how K<SUP>+</SUP> permeates the plasma membrane to control fundamental processes such as secretion, neuronal communication, and heartbeat. However, how K<SUP>+</SUP> permeates organelles such as lysosomes and endosomes is unknown. Here, we directly recorded organelle K<SUP>+</SUP> conductance and discovered a major K<SUP>+</SUP>-selective channel K<SUB>EL</SUB> on endosomes and lysosomes. K<SUB>EL</SUB> is formed by TMEM175, a protein with unknown function. Unlike any of the ~80 plasma membrane K<SUP>+</SUP> channels, TMEM175 has two repeats of 6-transmembrane-spanning segments and has no GYG K<SUP>+</SUP> channel sequence signature-containing, pore-forming P loop. Lysosomes lacking TMEM175 exhibit no K<SUP>+</SUP> conductance, have a markedly depolarized ΔΨ and little sensitivity to changes in [K<SUP>+</SUP>], and have compromised luminal pH stability and abnormal fusion with autophagosomes during autophagy. Thus, TMEM175 comprises a K<SUP>+</SUP> channel that underlies the molecular mechanism of lysosomal K<SUP>+</SUP> permeability.

망간계 산화물 La₁??Ce??MnO₃(x=0.2, 0.3, 0.4)의 전기,자기 및 열적 특성 연구

서금영,이보화 한국외국어대학교 외국학종합연구센터 부설 기초과학연구소 1999 기초과학연구 Vol.9 No.-

망간계 산화물 La₁???Ce??MnO₃(x=0.2, 0.3, 0.4)의 전기, 자기 및 열적 특성에 관한 연구를 X-선 회절, 전기저항, 자화율, 비열 및 광음향 신호 측정을 통하여 수행하였다. LaMnO₃의La대신 Ce 이온의 치환은 강자성 정렬의 발생과 더불어서 금속-절연체의 전이를 일으킨다. 강자성 전이는 x=0.2, 0.3, 0.4에 대햐여 각각 249K, 259K, 249K에서 일어난다. x=0.3의 경우, 온도에 따른 비저항 곡선에서 열적 이력현상은 관찰할 수 없었으며, 광음향 신호의 크기의 변화 또한 온도를 올리거나 내리는 경우 같은 온도에서 일어났다. 이것은 상전이가 전이온도에서 잠열이 존재하지 않는 2차 상전이임을 의미한다. Resencwaig와 Gersho의 이론을 사용하여 열전도도의 상대적인 값을 광음향 신호에서 얻을 수 있었다. Electric, magnetic, and therma] properties for La₁???Ce??MnO₃ (x=0.2, 0.3, 0.4) were investigated by means of X-ray diffraction, electrical resistivity, magnetization, specific heat, and photoacoustic signal measurements. The substitution of La by Ce in LaMnO₃ induces a metal-insulator transition accompanied by the occurrence of ferromagnetic ordering. The ferromagnetic transition temperatures are 249K, 259K, 249K for x=0.2, 0.3, 0.4, respectively. For x=0.3, there is no observable thermal hysteresis in resistivity measurement, and the change of photoacoustic signal amplitude arises at the same temperature in both cases with decreasing and increasing temperatures. This implies that the phase transition can be regarded as a second-order phase transition with no latent heat at transition temperature. Using Rosencwaig and Gersho's theory, the relative value of thermal conductivity can be obtained from the photoacoustic signal.

K-band frequency-selective limiter using an injection locked oscillator for blocker cancellation

Choi, K.,Jung, J.,Park, H.,Seo, T.,Jeong, J.,Kwon, Y. Institution of Electrical Engineers 2018 Electronics letters Vol.54 No.7

<P>A frequency-selective limiter (FSL) using an injection locked oscillator (ILO) is proposed for a blocker cancellation, which employs an ILO in the feedforward path as a high-Q notch filter to select and amplify the blocker from the input signal. The ILO also functions as a phase shifter providing a proper phase delay so that two blockers in the feedforward and thru paths cancel each other out in the combining node. The proposed FSL is fabricated in a commercial 0.15 mu m GaAs pHEMT process with a maximum blocker suppression of 27 dB in the 50 MHz spacing two-tone measurement at the K-band. Thus, it provides a blocker suppression higher than 20 dB over the 250 MHz blocker bandwidth.</P>

A Case of Letterer-Siwe Disease

Lee, Y. J 大韓皮膚科學會 1995 大韓皮膚科學會誌 Vol.33 No.5

Microstructure and piezoelectric properties of (Na_0.5K_0.5)NbO₃ lead-free piezoelectric ceramics with V₂O₅ addition

Seo, I.-T.,Park, H.-Y.,Dung, N.V.,Choi, M.-K.,Nahm, S.,Lee, H.-G.,Choi, B.-H. IEEE 2009 and Frequency Control Vol.56 No.11

<P>Various amounts of Nb<SUB>2</SUB>O<SUB>5</SUB> in the (Na<SUB>0.5</SUB>K<SUB>0.5</SUB>) NbO<SUB>3</SUB> (NKN) ceramic were replaced by V<SUB>2</SUB>O<SUB>5</SUB> to decrease its sintering temperature to below 950°C. A small V<SUB>2</SUB>O<SUB>5</SUB> content resulted in a dense microstructure with an increased grain size for the specimen sintered at 900°C due to the presence of a liquid phase. When V<SUB>2</SUB>O<SUB>5</SUB> was added to the NKN ceramics, their orthorhombic-to-tetragonal transition temperature increased from 178°C to around 200°C. However, their Curie temperature decreased from 402°C to around 330°C. The k<SUB>p</SUB>, <SUB>ε3</SUB> <SUP>T</SUP>/<SUB>ε0</SUB>, and Q<SUB>m</SUB> values increased with V<SUB>2</SUB>O<SUB>5</SUB> addition, probably due to the increased density and poling state, which was identified by the phase angle. The specimen with x = 0.05, sintered at 900°C for 8 h, exhibited the following piezoelectric properties: k<SUB>p</SUB> = 0.32, <SUB>ε3</SUB> <SUP>T</SUP>/<SUB>ε0</SUB> = 245, d<SUB>33</SUB> = 120 (pC/N), and Q<SUB>m</SUB> = 232.</P>

A Design of Transferable Sample Holder for Resistive Heating and Conductive Cooling

Seo, J.M.,Kim, K.J.,Ihm, S.,Koo, S.J.,Park, Ch.,Kim, Y.K. 全北大學校 基礎科學硏究所 1994 基礎科學 Vol.16 No.-

통전가열, 접촉냉각, 전기적 bias 및 시료 교환을 자유로이 할 수 있는 다기능의 새롭고 간단한 시료 고정장치를 저온 및 초고진공 상태에서 기체와 여러 방향의 시료표면 사이의 상호작용을 연구하기 위하여 고안하였다. 이 장치로써 2분 이내에 기판의 온도를 1600 K에서 20 K로 2분 이내에 냉각시킬 수 있었다. 그러므로 청결한 표면위에 수소나 He이나 Ne을 제외하고는 대부분의 기체를 흡착시킬 수 있게 되었다. 이러한 장치는 표면에서의 상변화, 기체와 표면의 화학반응의 연구에 중요하게 활용될 수 있다. A simple and novel sample-holder which has multi-functions of resistive heating, conductive cooling, electrical biasing and sample exchanging has been designed in order to inverstigate gas-surface interations for various surface direction under ultrahigh vacuum and low temperature. It has been proved that the wafer can be cooled from 1600 K to 20 K within two minutes. Therefore the controlled adsorption of most gases, except H, He and Ne, were possible on the clean surfaces. The design has substantial applocations in areas like surface phase transitions and gas-surface chemical reactions.

미국 의학드라마에 나타난 간호이미지와 역할수행 연구

권영애,길민지,김정현,박옥경,서민정,유현정,이민경,정지혜,조양현,천기윤,이자형,정덕유,김성남 이화여자대학교 간호과학대학 2009 이화간호학회지 Vol.- No.43

We tried to inquire the people's views on nursing or nurses, correct the image of nurse and take it as a basis to be applied on nursing education examining the image of nursing on Television drama playing a important role of mass media. 523 nurses of the characters in drama is applied to the analysis object of this study by selecting 3 American medical dramas, Grey's Anatomy, House M.D, E.R from 2005 to 2007. Contents analysis method was used in Data Analysis, which was used in Lim Mi-lim ?Research on contents analysis on image of nursing on television drama?, 7 Items was used after Coders previously modify and compensate it based on research documents of Kalish & Kalisch(1986), Yoon Young(1983), Lee Hye-Ok(1982), Lee Young-Bok, etc in analysis items. Before making the coding, we did pre-test. 6 Coders made of 3teams, 2 Coders are in each team, made the Codings the article on each person by Item seeing the recorded Film. An each team makes coding about 50episodes, total 147episodes for 2weeks. We used double coding and when the results are different between two coders, we decided just one result through mutual agreement. The average of reliability degree was 97.4% which measured the reliability degree by the method of Holsti. The statistic method of Frequency, Percentage was used using EXCEL Program in data processing. The result of research is as follows. 1. The general feature of nurses on the drama is that they are women(92.7%) which is 20 or 30-aged(70.5%). 2. Relative importance of 65.2% nurses in drama is depicted as surrounding characters and most of them was expressed as the character plating surrounding role. 3. The affair attitude of nurses shown on drama is revealed as active(24.5%), autonomous(32%), kind(16.8%), mechanical(23.2%) and adept(28.4%). However, unknown category is the highest in all affairs. 4. The professional activity of nurses was classified with professional/simple affair, The professional activity of nurses was 80% and simple activity of nurses was 22.9%. The professional activity of nurses was classified with personal/assistant affair. The personal activity of nurses was 61.9% and assistant activity of nurses was 15.1%. 5. The place nurses of the drama appears are hospital(97.7%). 6. The appearance feature of nurses is shown on common physique (55.0%), common stature(79.3%), common appearance(76.1%), common dignity(97.5%) and decent (51.1%). 7. The feature of character of nurses depicted on Television drama is neutral in all 11 affairs. We want the following epigraph based on above conclusion. 1. The continuos research intended for mass people is required about how their image of nurse is changed after watching medical drama. 2. The research to construct monitoring mass media system and make plans for developing is required for nurse image being in a triangular position as a professional job.

食品中의 微量金屬에 關한 調査硏究 : 農産物(穀類,豆類,薯類)中의 微量金屬 含有量에 關하여 On the trace metals contents of cereals, pulses and potatoes in Korea

金吉生,金昌珉,蘇酉變,徐錫春,鄭泰英,柳順英,宋璟姬,金鍾成,李海彬 국립보건연구원 1994 국립보건원보 Vol.31 No.2