High-resolution electrohydrodynamic inkjet printing of stretchable metal oxide semiconductor transistors with high performance

Kim, S.-Y.,Kim, K.,Hwang, Y. H.,Park, J.,Jang, J.,Nam, Y.,Kang, Y.,Kim, M.,Park, H. J.,Lee, Z.,Choi, J.,Kim, Y.,Jeong, S.,Bae, B.-S.,Park, J.-U. The Royal Society of Chemistry 2016 Nanoscale Vol.8 No.39

<P>As demands for high pixel densities and wearable forms of displays increase, high-resolution printing technologies to achieve high performance transistors beyond current amorphous silicon levels and to allow low-temperature solution processability for plastic substrates have been explored as key processes in emerging flexible electronics. This study describes electrohydrodynamic inkjet (e-jet) technology for direct printing of oxide semiconductor thin film transistors (TFTs) with high resolution (minimum line width: 2 mu m) and superb performance, including high mobility (similar to 230 cm(2) V-1 s(-1)). Logic operations of the amplifier circuits composed of these e-jet-printed metal oxide semiconductor (MOS) TFTs demonstrate their high performance. Printed In2O TFTs with e-jet printing-assisted high-resolution S/D electrodes were prepared, and the direct printing of passivation layers on these channels enhanced their gate-bias stabilities significantly. Moreover, low process temperatures (<250 degrees C) enable the use of thin plastic substrates; highly flexible and stretchable TFT arrays have been demonstrated, suggesting promise for next-generation printed electronics.</P>

수험생활 중 경주 및 포항 지진 경험

김선주,김유영,김은주,박솔민,배지윤,이민영,이유진,정재원,Li Keying,Wuyingjinzhu,신수진,도지영 이화여자대학교 간호과학대학 2019 이화간호학회지 Vol.- No.53

Purpose: The purpose of this study was to understand the experiences of Gyeongju and Pohang earthquakes during the examinees’ life. Methods: This study applied Colaizzis’s Phenomenological method. The Data was collected through in-depth interviews with a total 8 students of university in Seoul. Results: On the analysis of the interviews, their experience can be expressed as ‘Feeling embarrassed and frightened by earthquakes’, ‘Reduced susceptibility to earthquake hazards due to heavy exam pressure’, ‘Increased exam stress due to earthquake’, ‘Feeling the inadequacy of examinees' earthquake related safety measures in retrospect’. Conclusion: This study was meaningful in deeply understanding of their experiences and revealing that the examinees were more focused on studying rather than actively coping with the disaster. Furthermore, it reconsider the social climate surrounding college admission exams. This study meaningfully discovered that examinees could not stably prepare for both the exam and the earthquake evacuation procedures due to the timing of the earthquake in relation to their upcoming college admission test. Therefore, this study highlighted the examinees’ difficulties due to the earthquakes and increased the necessity of acute phase nursing intervention in relation to the seismic safety education system.

O-GlcNAc modulation at Akt1 Ser473 correlates with apoptosis of murine pancreatic β cells

Kang, E.S.,Han, D.,Park, J.,Kwak, T.K.,Oh, M.A.,Lee, S.A.,Choi, S.,Park, Z.Y.,Kim, Y.,Lee, J.W. Academic Press 2008 Experimental cell research Vol.314 No.11

O-GlcNAc transferase (OGT)-mediated modification of protein Ser/Thr residues with O-GlcNAc influences protein activity, similar to the effects of phosphorylation. The anti-apoptotic Akt1 is both activated by phosphorylation and modified with O-GlcNAc. However, the nature and significance of the Akt1 O-GlcNAc modification is unknown. The relationship of O-GlcNAc modification and phosphorylation at Akt1 Ser473 was examined with respect to apoptosis of murine β-pancreatic cells. Glucosamine treatment induced apoptosis, which correlated with enhanced O-GlcNAc modification of Akt1 and concomitant reduction in Ser473 phosphorylation. Pharmacological inhibition of OGT or O-GlcNAcase revealed an inverse correlation between O-GlcNAc modification and Ser473 phosphorylation of Akt1. MALDI-TOF/TOF mass spectrometry analysis of Akt1 immunoprecipitates from glucosamine-treated cells, but not untreated controls, showed a peptide containing S473/T479 that was presumably modified with O-GlcNAc. Furthermore, in vitro O-GlcNAc-modification analysis of wildtype and mutant Akt1 revealed that S473 was targeted by recombinant OGT. A S473A Akt1 mutant demonstrated reduced basal and glucosamine-induced Akt1 O-GlcNAc modification compared with wildtype Akt1. Furthermore, wildtype Akt1, but not the S473A mutant, appeared to be associated with OGT following glucosamine treatment. Together, these observations suggest that Akt1 Ser473 may undergo both phosphorylation and O-GlcNAc modification, and the balance between these may regulate murine β-pancreatic cell fate.

化粧品의 特殊成分에 關한 硏究 (Ⅱ) : 일소방지제중 紫外線 遮斷劑의 分析法 Analysis of Sunscreen in Sunscreen Preparation by HPLC

張映京,禹濟昇,崔相淑,金仁圭,金性子,朴性憲,金鍾甲 국립보건연구원 1989 국립보건원보 Vol.26 No.

水稻 品種間 交雜에 있어서 稈長의 遺傳 分離 : Ⅷ. 短稈 Japonica 品種들과 d-t 對應 長稈 檢定親과의 組合 Ⅷ. The segregation of culm length in the crosses between short Japonica cultivars and a tall Indica tester allelic to d-t height.

金弘烈,金容權,安鍾雄,朴淳直,許文會 서울大學校 農科大學 1985 서울대농학연구지 Vol.10 No.2

短稈 Japonica 品種들의 Semi-dwarf (d-t) gene에 對한 allelism을 檢討하기 위하여 Semi dwarf gene을 가진 wx 817과 그에 대하여 allelic tall 因子를 가진 Binato를 檢定親으로 하여 Binato에 6個의 短稈 Japonica 品種을 交配하여 그 F₁, F₂ 및 F₃를 展開하여 稈長을 調査하였다. 그 結果를 要約하면 다음과 같다. 1. 檢定親稈 組合인 Binato×wx 817의 F₂에서는 長稈:短稈이 3:1로 分離되어 기왕의 報告와 一致하였다. 2. 供試된 短稈 Japonica 品種들은 檢定親인 Binato와의 組合 F₂에서 年次間 變異에 關係없이 모든 組合에서 長稈:短稈이 3:1로 分離되었다. 3. 短稈群에서 選拔된 F₃系統은 選拔 當時의 稈長을 中心으로 正規分布를 나타냈으나, 長稈群에서 選拔된 系統은 分離하는 것과 그렇지 않은 것이 2:1로 分離되어 理論値에 適合하였다. 4. 組合에 따라서는 F₃系統의 稈長 變異의 幅이 F₂集團에 비하여 다소 短稈된 組合과 伸張된 組合이 있었으나 稈長의 分離 樣相은 모든 組合에서 同一하였다. 5. 以上의 結果로 보아 供試된 短稈 Japonica 品種들의 稈長을 支配하는 主??遺傳子는 同一하지만 組合에 따라 서로 다른 微??遺傳子가 存在하는 것으로 推定된다. 6.F₂長桿群에서 選拔한 2群, 長一長群과 長一短群은 F₃에서 분명히 差가 나는 mode를 나타내어 選拔의 를 할 수 있었다. F₂短桿群에서 選拔한 F₃個體들의 變異를 보아 短稈群에서의 選拔도 有意할 것으로 추축되었다. Investigations were made to search for the semi-dwarf Japonicas allelic to the semi-dwarf rice cultivars which is controlled by d-t gene. Six dwarf Japonicas, Reimei,Hoyoku,Shiranui,Kokumasari, M.7 and S.224 were crossed to the tall tester cultivar, Binato. Binato is known having tall allelic gene to semi-dwarf gene d-t. Their F₁, F₂, and F₃ were grown in 1984 and 1985 and culm length were measured at harvest. The results are summarized as follows: 1. In the F₂ of test cross, Binato/wx817, culm ength was segregated 3 tall to 1 short, which conformed the tester's validity. 2. The F₂s of all 6 crosses showed 3 tall to 1 short segregation which indicated the short Japonicas were allelic to the tall tester variety. 3. F₃lines selected from short group of F₂showed no segregation but F₃ lines selected from tall group of F₂ were segregated in to 2 segregating and 1 not-segregating. 4. The range of variation of the short segregants and the tall segregants were variable depending on the cross combination, but the general patterns were similar in all 6 crosses. 5. From the results of F₂and F₃ segregations, it was concluded that the 6 semi-dwarf Japonicas tested here were controlled by same major gene d-t though they were modified by different minor genes. 6. The modes of segregation in F₃s selected from taller tall and selected from shorter tall were significantly different in every crosses which implies the selection effects. The selection effects in the short group also was presumed from their wide variations in F₃.

32 EFFECTS OF FUSION/ACTIVATION METHODS ON DEVELOPMENT OF EMBRYOS PRODUCED BY NUCLEAR TRANSFER OF PORCINE FETAL FIBROBLASTS

Cong, P. Q.,Song, E. S.,Kim, E. S.,Li, Z. H.,Yi, Y. J.,Park, C. S. CSIRO Publishing 2007 Reproduction, fertility, and development Vol.19 No.1

<P> Pigs have become increasingly important in the field of biomedical research, and interest has grown in the use of transgenic cloned pigs as potential xenograft donors. The present study were carried out to investigate the effects of intensity of DC pulse, number of DC pulses, and equilibration before fusion/activation on developmental ability of porcine embryos derived from nuclear transfer. Porcine cumulus-oocyte complexes (COCs) were cultured in modified TCM-199 (mTCM-199) medium for 44 h at 38.5�C, 5% CO2 in air. After in vitro maturation (IVM), metaphase II oocytes were selected for enucleation. Porcine fetal fibroblasts were obtained from a porcine fetus on Day 35 of gestation as donor cells. Oocytes were enucleated by removing, with a micropipette, the first polar body along with adjacent cytoplasm containing the metaphase plate; then a donor cell was injected in contact with the cytoplasm of each oocyte. In experiment 1, several different fusion/activation intensities (two DC pulses of 0.4, 0.8, 1.2, 1.6, and 2.0 kV cm-1 for 30 �s) were carried out to investigate the effect on the development of nuclear transfer embryos. In experiment 2, the reconstructed oocytes were fused and activated with 1, 2, or 3 DC pulses of 1.2 kV cm-1 for 30 �s. In experiment 3, reconstructed oocytes were equilibrated in mTCM-199 medium at 38.5�C, 5% CO2 for 0, 1, 2, 3, 4, 5, and 6 h. After equilibration, the reconstructed oocytes were fused and activated with one DC pulse of 1.2 kV cm-1 for 30 �s in fusion medium. The reconstructed embryos were transferred into PZM-3 medium containing 0.3% BSA for further culture. The rates of embryo cleavage and development of blastocyst stage were evaluated at 48 h and 6-7 days, respectively. The cell numbers of blastocysts were counted by using Hoechst 33342 epifluorescence staining. Data were analyzed by ANOVA and Duncan </P>

Environmental Risk Assessment of Genetically Engineered Herbicide-Tolerant <i>Zoysia japonica</i>

Bae, T. W.,Vanjildorj, E.,Song, S. Y.,Nishiguchi, S.,Yang, S. S.,Song, I. J.,Chandrasekhar, T.,Kang, T. W.,Kim, J. I.,Koh, Y. J.,Park, S. Y.,Lee, J.,Lee, Y.-E.,Ryu, K. H.,Riu, K. Z.,Song, P.-S.,Lee, H Wiley (John WileySons) 2008 Journal of environmental quality Vol.37 No.1

<P>Herbicide-tolerant Zoysia grass (Zoysia japonica Steud.) has been generated previously through Agrobacterium tumefaciens-mediated transformation. The genetically modified (GM) Zoysia grass survived Basta spraying and grew to maturity normally while the wild-type (WT) grass stopped growing and died. GM Zoysia grass will permit more efficient weed control for various turf grass plantings such as home lawns, golf courses, and parks. We examined the environmental/biodiversity risks of herbicide-tolerant GM Zoysia before applying to regulatory agencies for approval for commercial release. The GM and WT Zoysia grass' substantial trait equivalence, ability to cross-pollinate, and gene flow in confined and unconfined test fields were selectively analyzed for environmental/biodiversity effects. No difference between GM and WT Zoysia grass in substantial traits was found. To assess the potential for cross-pollination and gene flow, a non-selective herbicide, Basta, was used. Results showed that unintended cross-pollination with and gene flow from GM Zoysia grass were not detected in neighboring weed species examined, but were observed in WT Zoysia grass (on average, 6% at proximity, 1.2% at a distance of 0.5 m and 0.12% at a radius of 3 m, and 0% at distances over 3 m). On the basis of these initial studies, we conclude that the GM Zoysia grass generated in our laboratory and tested in the Nam Jeju County field does not appear to pose a significant risk when cultivated outside of test fields.</P>

Effects of phosphorus on the δ-Ni₃Nb phase precipitation and the stress rupture properties in alloy 718

Sun,W.R.,Lee,J.H.,Guo,S.R.,Yoo,Y.S.,Choe,S.J.,Park,N.K.,Hu,Z.Q. 창원대학교 공작기계기술연구센터 1999 연구업적집 Vol.1 No.1

The effects of phosphorus on the phase transformation and stress rupture properties of alloy 718 were investigated. The nucleation of δ- phase, which does not contain phosphorus, was suppressed by the enrichment of phosphorus at grain boundaries. A low level of phosphorus resulted in the formation of faults-containing film-like δ- phase along the grain boundaries, while a higher level of phosphorus favored the long lath-like δ- phase precipitation. Phosphorus greatly prolonged the stress rupture life of the alloy in the range of 0.0008-0.013 wt.% while it reduced the stress rupture life in the range of 0.013-0.049 wt.% The effect of phosphorus in the stress rupture properties was closely related to its interaction with oxygen. Phosphorus atoms, in the range of 0.0008-0.013 wt.%, enhanced the resistance to oxygen intrusion along the grain boundaries, protected the grain boundaries from decohesion by oxygen atoms and oxidation, and subsequently prolonged the rupture life of the alloy. The protection effect of p is clearly demonstrated by the phenomenon that the crack initiation site was shifted from the surface to the center in the stress-ruptured samples with increasing addition of P. Over 0.013 wt.%, the protection effect of phosphorus is excessive and phosphorus began to display its inherent effect of damaging the grain boundary strength ; the stress rupture life of the alloy was reduced accordingly. Maximum stress rupture life was thus obtained at ∼0.013 wt.% P ⓒ 1998 Elsevier Science S.A. All rights reserved.

Varietal Differences in Agronmic Characters under Different Altitudinal Locations with Equal Latitude in Paddy Rice

Park,S,Z,E,W,Lee,B,W,Lee 한국작물학회 1983 한국작물학회지 Vol.28 No.2

벼멸구에 抵抗性인 매끄러운葉 찰벼 系統 wx817

朴淳直,許文會,李殷雄,崔承允 서울大學校 農科大學 1981 서울대농학연구지 Vol.6 No.1

검수삭제 The paper reports about the breeding procedures and the agronomical characteristics of wx817 lines which has resistance to brown plant hopper (Nilaparvata lugens Stal.) with smooth leaves and floral glumes. 1. The glutinous rice wx817 was bred from the crosses 1R1317/1R833//1R667-98⁴/4/Malakit sinaguing/IR667-98³//1R2061/1R667-68. 2. The glabrous glutinous wx817 line also show the resistance to the stripe and dwarf viruses and bacterial leaf blight pathotype ⅠandⅡ. The penetrance of the restance to bacterial leaf blight pathotype I was incomplete. 3. Heading date of wx817 is about a week earlier in ordinary season and 4-5 days earlier in late season than that of Josangtongil. 4. The performance and other traits of wx817 are alike to the Josangtongil and Tongilchal. 5. The utility of smoothness in rice breeding and cultural practice are discussed.