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A Level- and Proficiency-based English Language Program of a Science University in Korea
조동완 한국영어교육학회 2012 ENGLISH TEACHING(영어교육) Vol.67 No.4
This research introduces an English language program of a research-oriented science and engineering university in Korea. The university had established a PBT TOEFL score of 550 as one of its graduation requirements in 1995, implementing it for fifteen years. The policy, however, created problems such as students’ learning focus on receptive skills of the language and the discrepancy between the English curriculum and the graduation requirement. In addition, students who were unable to graduate on time due to not meeting the graduation requirement had increased. Facing these issues,the institute abolished the TOEFL policy and developed a new English program, which is characterized by a level-based curriculum, the implementation of an in-house placement test, mandating a number of courses to take, focus on productive skills, and teaching both general English and ESP-oriented courses. With the aim to introduce its rationale, placement test and curriculum, this study also reports on the results of questionnaires designed to determine students’ perceptions of the new English program and main issues raised in a panel discussion designed to examine the program. Limits and suggestions for the program are lastly presented.
조동완,옥진은,윤위일,전헌수,안형수,양민,유영문 한국물리학회 2011 새물리 Vol.61 No.4
Fabrication of Si-related nanostructures is very important to improve the performance of electronic devices and to extend their application areas. We fabricated SiN_x nanowires embedded in the surfaces of Si substrates by using a Au catalyst and ammonia gas. The SiN_x nanowires were formed by a chemical reaction of silicon and nitrogen atoms decomposed from the ammonia gas through a vapor-liquid-solid (VLS) mechanism catalyzed by Au metal. The width and the length of the nanowires could be controlled by using the annealing temperature and time in the temperature range of 650 - 700℃. Not only the thermal treatment conditions but also the thickness of the Au catalyst was confirmed to be detrimental to controling the width and the length of the SiN_x nanowires. An average minimum width of 100 nm could be obtained for the SiN_x nanowires when the thickness of Au was 30Å. 실리콘과 관련된 나노구조의 제작은 전자 소자의 기능향상과 적용분야를확장시키는데 매우 중요하다. 본 연구에서는 Au 촉매와 암모니아 가스를사용하여 실리콘 기판 표면 근처에서 SiN_x 나노와이어를 제작하였다. Vapor-liquid-solid (VLS) 방법을 사용하여 촉매물질인 금속 Au에 의해실리콘 원자와 암모니아 가스로부터 분해된 질소 원자의 화학적인반응으로 SiN_x 나노와이어를 형성하였다. 나노와이어의 폭과 길이는성장온도 650 - 700℃에서 열처리 온도와 시간조절에 의해제어할 수 있었고, 열처리 조건뿐만 아니라 Au 촉매제의 증착 두께변화에 의해서도 SiN_x 나노와이어의 폭과 길이를 제어할 수 있음을확인하였다. Au의 두께가 30Å일 때, SiN_x 나노와이어의 평균적인폭은 100 nm 정도를 가짐을 확인할 수 있었다.
조동완,박정영 아시아테플 2015 The Journal of Asia TEFL Vol.12 No.4
This corpus-based study analyzes how supplementive participle clauses are used in science journal papers written for publication by Korean graduate students. Supplementive participle clauses help ensure syntactic sophistication and textual variety, but they cause difficulty to non-native speakers of English due to their diverse uses and structures and an unclear semantic relation between the main clause and the participle clause. With this concern in mind, this research uses 166 science and engineering journal articles written by Korean graduate students to investigate the frequency of supplementive participle clauses, as well as the supplementive participle clause structures and verb types used in them. Results show that this linguistic feature is used in Korean graduate students’ papers much less than in those published in internationally recognized journals such as Cell and Physical Review Letters and that the verbs used in Korean students’ papers lack variety. It is also found that dangling participle clauses are very often used and seem acceptable in written discourse in the science and engineering community. Pedagogical suggestions are provided to help Korean graduate students or EFL learners acquire supplementive participle clauses and use them appropriately.
Magnetic chitosan composite for adsorption of cationic and anionic dyes in aqueous solution
조동완,전병훈,전철민,Franklin W. Schwartz,정유진,송호철 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.28 No.-
A magnetic composite material composed of nano-magnetite (NMT), heulandite (HE), and cross-linkedchitosan was prepared and used as an adsorbent for methylene blue (MB) and methyl orange (MO). Thecomposite was characterized for the morphology, magnetic and surface properties. The optimal massratio of chitosan:HE:NMT for the best removal of both dyes was determined to be 1:1:0.33. Theadsorption of MB and MO followed the pseudo-second order kinetics, and the maximum adsorptioncapacities were 45.1 and 149.2 mg g 1 at pH 5.5, respectively. The adsorption of MB increased with thepH increase, while MO adsorption showed an opposite trend.
커피찌꺼기의 효율적인 열화학 전환을 위한 전이 금속 기반 첨가제효율 평가
조동완,장정윤,김선준,임길재 한국지하수토양환경학회 2022 지하수토양환경 Vol.27 No.1
This work examined the effect of mixing transition metal-based additives [FeCl3, Fe-containing paper mill sludge (PMS),CoCl2·H2O, ZrO2, and α-Fe2O3] on the thermochemical conversion of coffee waste (CW) in carbon dioxide-assistedpyrolysis process. Compared to the generation amounts of syngas (0.7 mole% H2 & 3.0 mole% CO) at 700oC from singlepyrolysis of CW, co-pyrolysis in the presence of Fe- or Zr-based additives resulted in the enhanced production of syngas,with the measured concentrations of H2 and CO ranging 1.1-3.4 mole% and 4.6-13.2 mole% at the same temperature,respectively. In addition, α-Fe2O3 biochar possessed the adsorption capacity of As(V) (19.3 mg g-1) comparable to that ofZrO2-biochar (21.2 mg g-1). In conclusion, solid-type Fe-based additive can be highly considered as an efficient catalyst tosimultaneously produce syngas (H2 & CO) as fuel energy resource and metal-biochar as sorbent.
A Corpus-based Study on the Frequency and Usage of Participial Clauses in Two Science Journals
조동완,김지현 한국영어교육학회 2009 ENGLISH TEACHING(영어교육) Vol.64 No.4
This study presents the frequency and usage of participial clauses in two representative science journals, Cell and Physical Review Letters, PRL. This linguistic feature functions as an important cohesive device connecting clauses, making the relationships clear and straightforward. A total of 300 journal papers, 150 published in Cell and 150 published in PRL, were analyzed using a computer program developed for this study. Sentence-ending participial clauses with the Main Clause, V+ing structure were most frequently found in both journal papers, with the proportion of 5.1 % of sentences in Cell papers and 2.5% in PRL papers. Verbs used in sentence-ending participial clauses represent the characteristics of each journal. The other types of participial clauses did not differ much in terms of frequency. Some pedagogical implications for the teaching of non-native speakers of English working in the field of science and technology are made.