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Layer-by-Layer Doping of Few-Layer Graphene Film
Gü,neş,, Fethullah,Shin, Hyeon-Jin,Biswas, Chandan,Han, Gang Hee,Kim, Eun Sung,Chae, Seung Jin,Choi, Jae-Young,Lee, Young Hee American Chemical Society 2010 ACS NANO Vol.4 No.8
<P>We propose a new method of layer-by-layer (LbL) doping of thin graphene films. Large area monolayer graphene was synthesized on Cu foil by using the chemical vapor deposition method. Each layer was transferred on a polyethylene terephthalate substrate followed by a salt-solution casting, where the whole process was repeated several times to get LbL-doped thin layers. With this method, sheet resistance was significantly decreased up to ∼80% with little sacrifice in transmittance. Unlike samples fabricated by topmost layer doping, our sample shows better environmental stability due to the presence of dominant neutral Au atoms on the surface which was confirmed by angle-resolved X-ray photoelectron spectroscopy. The sheet resistance of the LbL-doped four-layer graphene (11 × 11 cm<SUP>2</SUP>) was 54 Ω/sq at 85% transmittance, which meets the technical target for industrial applications.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2010/ancac3.2010.4.issue-8/nn1008808/production/images/medium/nn-2010-008808_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn1008808'>ACS Electronic Supporting Info</A></P>
초등영재 담당교사의 개인변인에 따른 영재교육 전문성 비교 분석
여상인 ( Sang Ihn Yeo ),최남구 ( Nam Gu Choi ) 경북대학교 과학교육연구소 2014 科學敎育硏究誌 Vol.38 No.1
이 연구의 목적은 초등과학영재를 담당하는 영재교사의 개인변인에 따른 영재교육 전문성의 차이를 비교·분석하는 것이다. 교사의 개인변인은 성별, 근무지역, 교육경력, 영재교사경력, 최종학력, 영재교육 직무연수의 정도로 설정하였다. 연구대상은 인천과 경기지역에서 초등과학영재를 지도하는 영재교사 98명이며, 영재교육 전문성을 측정하기 위한 검사 도구는 최남구(2011)가 개발한 것을 토대로 사용하였다. 영재교육 전문성의 하위 영역은 ‘철학적 이해와 사명감’, ‘전문적 자질’, ‘인성적 자질’이며, 전문적 자질은 다시 3개의 영역으로 나누어져 있다. 개인변인에 따른 영재교육 전문성에 대한 연구 결과는 다음과 같다. 성별에서는 전문적 자질에서 남교사의 평균이 여교사의 평균보다 통계적으로 유의하게 높았다. 근무지역에 따른 영재교사의 영재교육 전문성에서는 지역간에 차이가 있었지만, 하위 영역에 따라 서로 다른 결과를 보였으며, 교육경력에 따른 영재교사의 영재교육 전문성은 차이를 보이지 않았다. 영재교육경력에서는 경력이 3년 이상은 되어야 전문성이 유의하게 높아졌으며, 최종학력이 높을수록 전문적 자질과 인성적 자질에서 유의하게 전문성이 높은 것으로 나타났다. 영재교육과 관련된 연수를 이수한 정도에 따른 영재교사의 영재교육 전문성은 유의한 차이를 보이지 않았지만, 연수를 경험한 횟수가 많을수록 평균은 높았다. 전체적으로 영재교육 전문성의 하위 영역인 ‘철학적 이해와 사명감’과 ‘인성적 자질’은 본 연구에서 분석한 교사의 개인변인에 큰 영향을 받지 않았다. The purpose of this study was to analyze and compare the professionalism of elementary teachers in charge of teaching the science-gifted children, based on their personal variables, such as gender, educational career in normal class and gifted class, training in gifted education, academic degree, etc. For this study, the questionnaire was modified by referring to Choi`s survey, and conducted to 98 teachers. The results of this study were as follows: In gender, the average of male teachers was significantly higher than the average of female teachers in their professionalism in gifted education. Regional difference was found in the teacher`s professionalism, however, showed different aspects in the sub-domain. The teachers` professionalism in accordance with the career in education was no difference. In gifted education career, professionalism increased as high career in gifted education, especially, more than three years. As better educated, teachers` professionalism in responsibility and philosophical understanding for gifted education was increased significantly. The teachers` professionalism according to the degree of training related to gifted education was no significant difference. Overall, ``responsibility and philosophical understanding`` and ``humanities-oriented quality`` for gifted education were not greatly affected by teacher`s personal variables in this study. Based on conclusions, implications for improving their professionalism in gifted education were discussed.
Gu, Ja-Shin,Choi, Sung-Jin,Choi, Ho-Suk,Shin, Won-Seob 대한물리치료학회 2016 대한물리치료학회지 Vol.28 No.1
Purpose: The aim of this study was to determine the effectiveness of pelvic tilt training using an inclinometer on joint position sense and postural alignment in individuals with stroke. Methods: Thirty-one subjects with chronic stroke were divided into two groups: the experimental group (16 subjects) and the control group (15 subjects). Subjects in both groups received neuro-developmental therapy five times per week. In addition, the patients in the experimental group also received pelvic tilt training using an inclinometer for 30 minutes, 3 times a week for 4 weeks. Maximal range of anterior, posterior pelvic tilt and joint position sense were used to evaluate pelvic tilt motion. Image analysis was performed for evaluation of postural alignment on in standing position. Results: Significant difference in Iimprovement of pre- and post-intervention of joint position sense was observed showed significant difference (p<0.05) in all groups. Experimental groups showed sSignificant differences in maximal range of posterior pelvic tilt in on the paretic side were observed in the experimental groups compared to with the control group (p<0.05). Conclusion: These findings suggest that pelvic tilt training using an inclinometer may help to improve range of pelvic tilt and joint position sense of stroke patients.
Choi, Il Su,Kang, Na Rae,Kim, Young Keun,Jun, Hyeon Jong,Choi, Yong,Kang, Tae Gyoung,Hyun, Chang Sik,Lee, Sang Hee,Kim, Jin Gu,Yu, Seoung Hwa,Chung, Sun Ok Korean Society for Agricultural Machinery 2018 바이오시스템공학 Vol.43 No.4
Purpose: This research was conducted to determine the design factors of a seed-metering device for the development of a seeder. The device allows the seeder to sow precisely one to three seeds of foxtail millet and sorghum. To obtain fundamental information regarding the design of the seed-metering device, examination of the physical properties of foxtail millet and sorghum was conducted. Methods: Based on the results of an adaptability test using an existing seeder with foxtail millet and sorghum, an experimental roller-type seed-metering device was made. The seeding factors considered during the experiment were the width, length, and depth, as well as the shape of the groove in the seed-metering roller. By adapting an analysis of variance, the experimental results of the seeding factors were analyzed. Results: The measured results of the respective lengths and widths of the seeds were 2.11 and 1.64 mm for foxtail millet, and 3.68 and 3.32 mm for sorghum, respectively. The weight of 1,000 seeds was 2.43 g for foxtail millet and 17.5 g for sorghum. The seeds were of an elliptical shape, considering the length and width. A sieve analysis showed that the size distribution of foxtail millet was quite regular whereas that of sorghum was irregular. Conclusions: The seeding results showed that the rates of incorrect planting were low when the groove of the roller-type metering device is an elliptical type. To sow one to three seeds, the groove of roller-type metering devices $2.0mm{\times}4.0mm{\times}1.5mm$ ($width{\times}length{\times}depth$) for foxtail millet, and $4.0mm{\times}8.0mm{\times}3.0mm$ and $4.5mm{\times}8.0mm{\times}3.0mm$ ($width{\times}length{\times}depth$) for Sorghum.
Sources and Distributions of Organic Wastewater Compounds on the Mokpo Coast of Korea
Choi, Min-Kyu,Choi, Hee-Gu,Moon, Hyo-Bang,Yu, Jun,Kang, Sung-Kyung,Choi, Su-Kyung The Korean Society of Fisheries and Aquatic Scienc 2007 Fisheries and Aquatic Sciences Vol.10 No.4
Surface water and sediment samples collected from the Mokpo coast of Korea were analyzed for molecular markers of organic municipal wastewaters, i.e., 11 fecal sterols including coprostanol (Cop) and nonylphenolic compounds (NPs), to characterize the main routes of these wastewaters to the coast and to assess contamination levels. Concentrations of Cop ranged from 94 to 7,568 ng/L in surface water and from 43 to 38,108 ng/g dry weight in sediments. Concentrations of NPs [nonylphenol (NP) and nonylphenol mono- and di-ethoxylates ($NP_{1-2}EOs$)] ranged from 123 to 4,729 ng/L in surface water and from 4 to 2,119 ng/ng dry weight in sediments. The levels of these compounds were much higher at stations near the rivers that pass through the urban center of Mokpo and the outfall of the wastewater treatment plant (WWTP). The spatial distribution of Cop levels was statistically similar to that of NPs (r=0.809 and 0.982 in surface water and sediments, respectively), indicating that these compounds may have similar discharge points, transport, mixing, and deposition in the study area. These results suggest that considerable amounts of organic wastewater compounds are discharged through rivers and WWTP effluent to the Mokpo coast.
Accumulation of Butyltin Compounds in Shellfish and Fish from Korean Coastal Areas
Choi, Hee-Gu,Kim, Sang-Soo,Moon, Hyo-Bang,Lee, Pil-Yong,Gu, Bon-Kyu The Korean Society of Oceanography 2002 Journal of the Korean Society of Oceanography Vol.37 No.2
Butyltins (BTs) were measured in 2 species of shellfish and 16 species of fish collected along the Korean coast. Tributyltin (TBT) was detected in the mussels and oysters of sentinel organisms (20 to 940 ng Sn/g dry wt), indicating widespread contamination of TBT in the Korean coast. The elevated concentrations of TBT in the shellfish found in the sites near harbors or shipyards suggested that antifouling paints are probable major sources of butyltins in these areas. The TBT compound was detected in 12 out of 16 fish samples. The concentrations of TBT in fish muscles wee between 7 and 151 ng Sn/g dry wt, while the level in whole body of anchovy was very high (793 ng Sn/g dry wt). Exposure doses to Korean people via consumption of these marine products wee evaluated. The results suggested that the environmental levels of TBT were below the level of concern.