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Synthesis and characterization of carbon doped TiO₂ photocatalysts supported on stainless steel mesh by sol-gel method
JO. Tijani, OO. Fatoba, TC. Totito, WD. Roos, LF. Petrik 한국탄소학회 Carbon Letters 12 Pages
한국탄소학회 Carbon Letters 2017, Vol.22 6 48-59 (12 pages)
suggested the substitution of titanium in TiO₂ by carbon. Instead of using calcination, PAN pyrolysis was used to control the carbon content, and the mesoporosity was tailored by the applied temperature. The supported TiO₂ nanocrystals prepared by pyrolysis at 300, 350, and 400ºC for 3 h on a stainless steel mesh were actual supported carbon doped TiO₂ nanocrystals. Thus, PAN/DMF/TiCl₄ offers a facile, robust sol-gel related route for preparing supported carbon doped TiO₂ nanocomposites. -
Sorption behavior of slightly reduced, three-dimensionally macroporous graphene oxides for physical loading of oils and organic solvents
Ho Seok Park, Sung Oong Kang 한국탄소학회 Carbon Letters 6 Pages
한국탄소학회 Carbon Letters 2016, Vol.18 4 24-29 (6 pages)
High pollutant-loading capacities (up to 319 times its own weight) are achieved by three-dimensional (3D) macroporous, slightly reduced graphene oxide (srGO) sorbents, which are prepared through ice-templating and consecutive thermal reduction. The reduction of the srGO is readily controlled by heating time under a mild condition (at 1 10?2 Torr and 200°C). The saturated sorption capacity of the hydrophilic srGO sorbent (thermally reduced for 1 h) could not be improved further even though the... -
Flow cytometric evaluation on the age-dependent changes of testicular DNA contents in rats
Chang Yong Yoon, Choong Man Hong, Yong-Yeon Cho, Ji Young Song, I Jin Hong, Dae Hyun Cho, Beom Jun Lee, Hee Jong Song, Cheol Kyu 대한수의학회 Journal of Veterinary Science 4 Pages
대한수의학회 Journal of Veterinary Science 2001, 제 2권 제 1호 7 43-46 (4 pages)
to the level of 42% at the age of 26 weeks. The proportion of immature haploid cells was dramatically increased to the age of 6 weeks, then maintained at the level of 20 to 30% thereafter. The proportion of diploid cells was 64% at the age of 4 weeks, then decreased gradually through the age of 26 weeks. The proportion of S-phase cells was increased to the age of 4 weeks, then maintained at a plateau level to the age of 26 weeks. The proportion of tetraploid cells were about 26% at the age of 4... -
A Study on Assessment Design for In-class Debates - With a Focus on Case Analyses of Judging at World Debating Championships
Lee Sun Young, Park Joshua 경인교육대학교 교육연구원 The Journal of Education 20 Pages
경인교육대학교 교육연구원 The Journal of Education 2019, Vol.2 No.2 7 85-104 (20 pages)
the most advanced developments in assessment methodologies and gain insights from the perspectives and experiences of expert educators. This study applies these insights to offer recommendations on assessment designs and evaluative elements for in-class debates. While this study is limited as a qualitative analysis of debate assessment practices, it adds unique value to literature by providing an initial step to linking international, Worlds-level debating to domestic in-class debate assessment. -
음악창작의 문화 비교를 위한 예비연구 - 한국과 미국을 중심으로 -
박은실, 강상미 한국음악교육학회 음악교육연구 22 Pages
한국음악교육학회 음악교육연구 2020, 제 49권 제 4호 3 53-74 (22 pages)
대한 문화를 비교하는 것이다. 32명의 한국학생들과 35명의 미국학생들을 대상으로 4주간 창작 지도를 하고 MuseScore2를 이용하여 8마디 가락을 창작하게 하였다. 합의적 평가기법(CAT)을 이용하여 평가한 결과, 두 나라 간 창의성에서 통계적으로 유의미한 차이가 없었다. 그러나 창의성에서 높은 점수와 낮은 점수를 받은 작품들을 추가적으로 분석한 결과, 창의성이 높은 그룹은 다양한 소리 선택, 발전과 대조, 구조화 등의 특징을, 그렇지 않은 그룹은 제한된 소리 선택, 단순함/반복의 특징을 공통적으로 가지고 있었다. 이미 있는... -
Electrochemical determination of chloramphenicol using a glassy carbon electrode modified with dendrite-like Fe₃O₄ nanoparticles
Krishnan Giribabu, Sung-Chan Jang, Yuvaraj Haldorai, Muruganantham Rethinasabapathy, Seo Yeong Oh, Arunkumar Rengaraj, Young-Kyu Han 한국탄소학회 Carbon Letters 10 Pages
한국탄소학회 Carbon Letters 2017, Vol.23 6 38-47 (10 pages)
(CAP) by cyclic voltammetry and square wave voltammetry. A reduction peak of CAP at the Fe3O4/GCE was observed at 0.62 V, whereas the uncoated GCE exhibited a very small response compared to that of the Fe3O4/GCE. The electrocatalytic ability of Fe3O4 was mainly attributed to the formation of Fe(VI) during the anodic scan, and its reduction to Fe(III) on the cathodic scan facilitated the sensing of CAP. The effects of pH and scan rate were measured to determine the optimum conditions at which th... -
Graphitization of PAN-based carbon fibers by CO₂ laser irradiation
Liangbo Yao, Weimin Yang, Sanyang Li, Yang Sha, Jing Tan, Ying An, Haoyi Li 한국탄소학회 Carbon Letters 6 Pages
한국탄소학회 Carbon Letters 2017, Vol.24 13 97-102 (6 pages)
diffraction data revealed that the growth of crystallite was parallel to the fiber axis, and the interlayer spacing d002 decreased from 0.353 to 0.345 nm. The results of scanning electron microscopy revealed that the surface of irradiated CFs was rougher than that of the unirradiated ones and there were scale-like small fragments that had peeled off from the fibers. The tensile modulus increased by 17.51% and the Weibull average tensile strength decreased by 30.53% after being irradiated by a... -
Method and mechanism of dispersing agent free dispersion of short carbon fibers in silicon carbide powder
Thakur Sudesh Kumar Raunija, Mariamma Mathew, Sharad Chandra Sharma 한국탄소학회 Carbon Letters 7 Pages
한국탄소학회 Carbon Letters 2014, Vol.15 No.3 4 180-186 (7 pages)
a novel method and mechanism for the rapid and effective milling of carbon fibers (CFs) in silicon carbide (SiC) powder, and also the dispersion of CFs in SiC powder. The composite powders were prepared by chopping and exfoliation of CFs, and ball milling of CFs and SiC powder in isopropyl alcohol. A wide range of CFs loading, from 10 to 50 vol%, was studied. The milling of CFs and SiC powder was checked by measuring the average particle size of the composite powders. The dispersivity of CFs in... -
엔진실린더내의 유동해석을 위한 수치해석방법
최종욱, 이용호, 박찬국, Choi. J. W., Lee. Y. H., Park. C. K. 한국전산유체공학회 한국전산유체공학회지 7 Pages
한국전산유체공학회 한국전산유체공학회지 2000, Vol.5 No.1 1-7 (7 pages)
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피스톤에 의해 유입되는 유동에 대한 유한요소법을 이용한 수치해석
최종욱, 박찬국, Choi. J. W., Park. C. K. 한국전산유체공학회 한국전산유체공학회지 8 Pages
한국전산유체공학회 한국전산유체공학회지 1999, Vol.4 No.2 39-46 (8 pages)
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Microtubule distribution in somatic cell nuclear transfer bovine embryos following control of nuclear remodeling type
Dae-Jin Kwon, Yu-Mi Lee, In-Sun Hwang, Choon-Keun Park, Boo-Keun Yang, Hee-Tae Cheong 대한수의학회 Journal of Veterinary Science 9 Pages
대한수의학회 Journal of Veterinary Science 2010, 제 11권 제 2호 1 93-101 (9 pages)
not disappear until 3 h after fusion, regardless of treatment (82.9-87.2%). A significantly high proportion of embryos showing an abnormal chromosome or microtubule distribution was observed in the roscovitine- treated group (40.0%, p ＜ 0.05) compared to the caffeine- treated group (22.1%). In conclusion, PCC is a favorable condition for the normal organization of microtubules, and inhibition of PCC can cause abnormal mitotic division of bovine SCNT embryos by causing microtubule dysfunction. -
A facile green reduction of graphene oxide using Annona squamosa leaf extract
Basavaiah Chandu, Venkata Sai Sriram Mosali, Bhanu Mullamuri, Hari Babu Bollikolla 한국탄소학회 Carbon Letters 7 Pages
한국탄소학회 Carbon Letters 2017, Vol.21 9 74-80 (7 pages)
A highly facile and eco-friendly green synthesis of Annona squamosa (custard apple) leaf extract reduced graphene oxide (CRG) nanosheets was achieved by the reduction of graphene oxide (GO). The as-prepared CRG was characterized with X-ray diffraction (XRD), transmission electron microscope (TEM), Fourier-transform infrared spectroscopy (FT-IR), ultraviolet-visible (UV-Vis), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopic techniques. Removal of oxygen containing moieties from the... -
연계 파랑류 수치모형 시스템의 개발 및 이안제가 설치된 해안에서의 적용
장창환, 김효섭, 임남재 한국습지학회 한국습지학회지 17 Pages
한국습지학회 한국습지학회지 2012, Vol.14 No.4 1 439-455 (17 pages)
Osiecki(1994)가 제안한 roller로 인한 응력에 의해 발생되는 기인력을 추가하였고, Kim(2004)이 제안한 완화기법을 도입하여 lateral mixing 처리를 수행하지 않아도 자연현상과 유사한 결과를 얻을 수 있도록 개발되었다. 개발된 파랑에 의한 기인력 수치모형은 계산시 Δt에 제약을 받지 않는다는 장점을 가지고 있으며, 흐름장 수치모형의 source항이 되어 파랑류의 양상을 계산할 수 있도록 하였다. 연계된 파랑류 수치모형을 검증하기 위해서 Nishimura et al.(1985)의 수리모형실험과 Kim(2004)의 수심적분된 파랑류 수치모형과... -
유한차분법과 유한체적법을 이용한 1차원과 2차원 개수로 흐름해석
김만식, 이진희, 정찬, 박노혁 한국습지학회 한국습지학회지 13 Pages
한국습지학회 한국습지학회지 2008, Vol.10 No.2 5 67-79 (13 pages)
하천에서의 부정류 해석을 위해서 1차원 유한차분법(FDM)인 Abbott-Ionescu scheme과 2차원 유한체적법(FVM)인 근사의 Riemann solver(Osher scheme)에 대하여 살펴보았다. 두 모형은 직선 하도, 약간 굽어진 사행하도 및 사행하도에서의 흐름 문제들에 적용되었으며 결과의 비교는 균일한 직사각형 수로에 대하여 이루어졌다. 하천의 복잡한 형상의 표현하기 위해서는 이를 고려할 수 있는 유한체적법을 이용하였다. 유한차분법과 유한체적법 결과는 수위 및 유량 수문곡선에 대하여 매우 만족스러운 것으로 나타났다. 균일한 직선하도에... -
The Trend of Body Mass Index (BMI) Changes among Malaysian Children and the Prediction at 48 Months Old
Aslina Saad, Suzani Samuri, Bahbibi Rahmatullah, Mazlina Che Mustafa 환태평양유아교육연구학회 Asia-Pacific journal of research in early childhood education 20 Pages
환태평양유아교육연구학회 Asia-Pacific journal of research in early childhood education 2021, Vol.15 No.2 9 187-206 (20 pages)
had registered at the National Child Data Centre (NCDC) were analyzed and predicted using the decision tree algorithms of Rapid miner. The BMI of 48 months-old children can be reliably predicted by their BMI statuses at the ages of 21, 24, 27, 36, 42, and 45 months, parents’ incomes, and gender while the BMI at the age of 20 months and below are the negative predictors. The prediction model developed in this study may help practitioners to monitor such children’s BMI, especially in detecting t...
