BSIM 기반 안전관리 통합플랫폼의 마크업 시스템 개발방안 연구

조동완(Dongwan Cho),손영석(Youngseok Sohn),최상덕(Sangdeok Choi) (사)한국CDE학회 2015 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2015 No.동계

번역 과제 발표 중심의 대학 영작문 수업에 관한 연구

조동완(Cho, Dong Wan) 한국외국어교육학회 2009 Foreign languages education Vol.16 No.1

This study reports on a college expository writing class which consists of student presentations based on a translation assignment. In each class, a student assigned in advance gave an oral presentation in English on part of an essay translated into English from Korean. The Korean version of the essay used for English translation was translated from an English essay. The presentation compared a presenter's English translation with the original English version, focusing mainly on differences in the linguistic features of writing such as grammar, sentence structure, and vocabulary. Since all the students in the class should complete the same translation assignment before class, they were quite familiar with the content of each class, which in turn led to active classroom discussions. The questionnaire and interview results showed that the translation assignment and classroom activities of presentation and discussions made a great contribution to boosting the students' overall writing proficiency and, in particular, the accuracy of writing. Irrespective of fulfilling the intended goals of the class, some weakness and problems of the class were identified. Several suggestions were to ameliorate them.

쓰기 중심의 대학 교양영어 프로그램의 개발과 운영 성과에 관한 연구

조동완(Cho Dongwan) 한국외국어교육학회 2006 Foreign languages education Vol.13 No.2

  This paper presents the rationale behind a newly-developed and implemented college freshman program designed to improve writing skills and the outcomes after one year running. In line with the current teaching trend of colleges in Korea, this program has several features such as placing the freshmen into different levels based on their writing skills, running class focusing on writing skills and giving a S/U grade. Comparisons between a pre-writing test and two post-writing tests show that this program has contributed to increasing the students’ writing skills. The students’ responses to the questionnaire of the program also endorse the test results. A couple of pedagogical implications concerning EFL writing education are suggested.

흄드 실리카가 영가철에 의한 질산성질소 환원에 미치는 영향

조동완(Dong Wan Cho),전병훈(Byong Hun Jeon),김용제(Yong Je Kim),송호철(Ho Cheol Song) 大韓環境工學會 2010 대한환경공학회지 Vol.32 No.6

다양한 반응조에서 흄드 실리카(silica(fumed))가 질산성질소 처리를 위한 영가철 공정에 미치는 영향을 알아보기 위한 회분실험(batch experiment)을 수행하였다. 반응조는 질산성질소만 주입한 경우, 질산성질소와 지하수 환경에 존재하는 이온들을 주입한 경우, 실제 질산성질소로 오염된 지하수로 구성하였다. 지하수 환경을 가진 반응조에서 질산성질소 환원 속도가 빠르게 진행되었으며, 영가철/흄드 실리카 공정이 영가철 단독 공정에 비해 약 2.5 배의 반응 상수값((kobs)을 나타냈다. 전반적으로 주요 부산물인 암모늄은 영가철 단독 공정에서 약 70% 환원율로 발생하였으며, 영가철/흄드 실리카 공정의 경우에는 암모늄 발생율이 저감되었다. 수중 pH 는 영가철이 산화되면서 pH 가 상승하였으며, 지하수 환경에서는 상대적으로 낮게 유지되었다. 모든 반응조에서 영가철/흄드 실리카 공정의 pH 가 낮게 유지되었으며, 지하수 환경에서 질산성질소가고농도로 존재할 경우에는 저농도에 비해 pH 상승폭이 큰 것으로 나타났다. 또한 등온흡착실험을 수행한 결과, 흄드 실리카가 암모늄에 대한 흡착능을 보였다. 전반적인 결과들을 통해 흄드 실리카가 질산성질소를 처리하는 영가철 공정에 유용한 매질임을 확인하였다. The effect of silica(fumed) on nitrate reduction by zero-valent iron(ZVI) was studied using batch experiment. The reduction of nitrate was tested in three different aqueous media including de-ionized water, artificial groundwater and real groundwater contaminated by nitrate. Kinetics of nitrate reduction in groundwater were faster than those in de-ionized water, and first-order rate constant(kobs) of ZVI/silica(fumed) process was about 2.5 time greater than that of ZVI process in groundwater. Amendment of Silica(fumed) also decreased ammonium presumably through adsorption on silica surface. The pHs in all processes increased due to oxidation of ZVI, but the increase was lower in groundwater due to buffering capacity of groundwater. The result also showed amount of reduced nitrate increased as initial nitrate concentration increased in groundwater. Separate adsorption isotherm experiments indicated that fumed silica itself had some degree of adsorption capacity for ammonium. The overall results indicated that silica(fumed) might be a promising material for enhancing nitrate reduction by ZVI.

TEPS(Test of English Proficiency developed by Seoul National University)의 타당도에 대한 연구

조동완(Cho, Dongwan) 한국응용언어학회 2000 응용 언어학 Vol.16 No.1

개방형 BIM 기반 라이브러리의 IFD 활용을 위한 기초연구

조동완(Dongwan Cho),김인한(Inhan Kim),서종철(Jongcheol Seo),김종헌(Jonghun Kim) (사)한국CDE학회 2011 한국CDE학회 논문집 Vol.16 No.2

A variety of BIM libraries are required to apply BIM(Building Information Modeling) software and generate BIM data. However, enterprises are establishing their own libraries using BIM tools, the drawbacks are that these libraries are not open to other users, or they just can be used in some software packages. If IFC(Industry Foundation Classes), the standard format of open BIM, can be applied, the BIM library can be applied in all the BIM software packages. Although the enterprises can collaborate using IFC standard, it is difficult to represent all the property information of the construction materials by IFC. IFD(International Framework for Dictionaries) is used to solve these problems and add the property information of the construction materials easily. Therefore, Open BIM-based library needs to be developed using IFD. In this research, the development and application of BIM library and IFD in domestic and foreign countries were investigated and analyzed, and Open BIM-based IFD scenario was proposed for using, and finally by applying an IFD method, the IFD data was added within an IFC model. Consequently, Open BIM-based library can be extended with rich, formal, and semantic descriptions and enhance data interoperability among BIM software packages adopting Open BIM standard format, by applying the IFD.

실시간 음성 특징 추출을 위한 필터 뱅크의 설계

조동완(Cho, Dong Wan),홍희식(Hong, Hee Sik),한영렬(Han, Young Yearl) 한국통신학회 1990 한국통신학회 학술대회논문집 Vol.1990 No.11

The Assessment of Content in EFL Compositions

Dongwan Cho(조동완) 한국외국어교육학회 2007 Foreign languages education Vol.14 No.4

This study explored how instructors teaching in the same EFL program rated content in compositions. Twenty-one writing samples written on three different topics were rated by five teacher-raters. The transcribed comments made by the teacher-raters showed that 1) their rating behaviors varied to a great extent as to the ways of commenting on and viewing the content of the compositions, 2) when a composition failed to address the topic given, it negatively affected the assessment of the quality of writing, and 3) the teacher-raters made fewer comments on the content of the formal essays than on the content of e-mails. A couple of suggestions are presented with respect to the necessity of establishing written guides for rating criteria for students" essays and of rater training.

광산배수 자연정화시설 내 버섯퇴비의 중금속 흡착능력 평가

용보영,조동완,정진웅,임길재,지상우,안주성,송호철,Yong, Bo-Young,Cho, Dong-Wan,Jeong, Jin-Woong,Lim, Gil-Jae,Ji, Sang-Woo,Ahn, Joo-Sung,Song, Ho-Cheol 대한자원환경지질학회 2010 자원환경지질 Vol.43 No.1

휴 폐 광산으로부터 유출되는 산성광산배수는 낮은 pH와 다량의 중금속 이온을 포함하고 있어 지하수·하천 오염 및 주변 환경 파괴의 원인이 되고 있다. 본 연구는 자연정화시설에서 기질물질의 흡착 특성 평가에 중점을 두었다. 이를 위해 버섯퇴비에 의해 광미로부터 용출된 중금속이 흡착 처리 되는 과정에서 황산염환원균의 영향을 파악하였고, $Cd^{2+}$, $Cu^{2+}$, $Pb^{2+}$, $Zn^{2+}$을 포함한 인공 광산배수와 버섯퇴비를 반응시켜 중금속 흡착 처리 효율 평가 및 등온흡착곡선에 관해 고찰하였다. 연구 결과 광미에서 용출된 Mn은 미생물 혹은 흡착에 의한 안정화가 이루어지지 않은 것으로 나타났으며. Zn의 경우 황산염환원균에 의한 제거 기작이 중요한 역할을 하고 있음을 보여주었다. Fe는 미생물을 제거한 경우보다 미생물이 존재할 경우 다량의 Fe가 용출되었으며 이는 철환원박테리아가 $Fe^{3+}$를 소모함에 따라 Fe를 포함한 광물이 용해되어 용출되었기 때문이라고 추측된다. 버섯퇴비 투여 시 산화환원전위 (Oxidation Reduction Potential) 와 pH 측정을 통해 환원 환경 및 중성 환경이 조성됨을 확인 할 수 있었다. 인공 광산배수를 사용한 흡착실험결과 pH 6 조건에서 버섯퇴비의 중금속 흡착 효율이 90% 이상으로 매우 높게 나타났으며, pH 3 조건에서는 보다 낮은 흡착 효율을 보였다. Acid mine drainage (AMD) from abandoned mine sites typically has low pH and contains high level of various heavy metals, aggravating ground- and surface water qualities and neighboring environments. This study investigated removal of heavy metals in a biological treatment system, mainly focusing on the removal by adsorption on a substrate material. Bench-scale batch experiments were performed with a mushroom compost to evaluate the adsorption characteristics of heavy metals leached out from a mine tailing sample and the role of SRB in the overall removal process. In addition, adsorption experiments were perform using an artificial AMD sample containing $Cd^{2+}$, $Cu^{2+}$, $Pb^{2+}$ and $Zn^{2+}$ to assess adsorption capacity of the mushroom compost. The results indicated Mn leached out from mine tailing was not subject to microbial stabilization or adsorption onto mushroom compost while microbially mediated stabilization played an important role in the removal of Zn. Fe leaching significantly increased in the presence of microbes as compared to autoclaved samples, and this was attributed to dissolution of Fe minerals in the mine tailing in a response to the depletion of $Fe^{3+}$ by iron reduction bacteria. Measurement of oxidation reduction potential (ORP) and pH indicated the reactive mixture maintained reducing condition and moderate pH during the reaction. The results of the adsorption experiments involving artificial AMD sample indicated adsorption removal efficiency was greater than 90% at pH 6 condition, but it decreased at pH 3 condition.

혼합소스 HVPE 방법에 의한 InGaN 나노구조의 성장에 있어서 Sb 첨가의 영향

옥진은,조동완,전헌수,이아름,이강석,조영지,김경화,장지호,안형수,양민,Ok, Jin-Eun,Jo, Dong-Wan,Jeon, Hun-Soo,Lee, Ah-Reum,Lee, Gang-Suok,Cho, Young-Ji,Kim, Kyung-Hwa,Chang, Ji-Ho,Ahn, Hyung-Soo,Yang, Min 한국결정성장학회 2010 한국결정성장학회지 Vol.20 No.3

본 논문에서는 Sb를 촉매제로 이용하는 경우의 InGaN 나노구조의 성장과 구조적 특징 및 광학적 특성에 대해서 연구하였다. 결정성장에 있어서 촉매제의 사용은 성장 모드의 변화와 결정 결함의 감소 등을 위한 목적으로 많이 사용되어왔다. 본 연구에서는 혼합소스 HVPE(hydride vapor phase epitaxy) 사용하여 (0001) 사파이어 기판 위에 InGaN 나노구조를 성장하였고, 구조적 및 광학적 특성은 scanning electron microscope(SEM)과 photoluminescence(PL)를 통해 평가하였다. Sb이 첨가되지 않은 경우에는 InGaN 나노구조가 c-축 방향으로 정렬되는 경향을 보이지만 Sb이 첨가된 경우에는 InGaN 나노구조의 c-축 방향이 기판에 대해 평행하거나 경사진 방향으로 정렬되고 있는 것을 관찰할 수 있었다. In의 조성은 Sb 의 첨가 여부에 관계없이 약 3.2% 정도로 계산되었다. 이러한 결과들로부터 측면 배향된 나노입자를 활성층으로 하는 광소자에 적용할 경우 압전 전계를 완화할 수 있기 때문에 광소자의 발광 성능을 향상시킬 수 있을 것으로 기대된다. We report on the growth and characteristics of the structural and optical properties of InGaN nano-structures doped with antimony (Sb) as a catalyst. The use of catalyst has been explored to modify the growth and defect generation during strained layer heteroepitaxial growth. We performed the growth of the InGaN nano-structures on c-sapphire substrates using mixed-source hydride vapor phase epitaxy (HVPE). The characteristic of samples was measured by scanning electron microscope (SEM) and photoluminescence (PL). The aligning direction of c-axis of the InGaN nano-structures was changed from vertical to parallel or inclined to the surface of substrates when the Sb was added as a catalyst. The indium composition was estimated about 3.2% in both cases of with or without the addition of Sb in the InxGal-xN structures. From the results of InGaN nano-structures formed with the addition of Sb, we can expect the performance of optical devices would be more improved by reduced piezo-electric field if we use the InGaN nano-structures of which c-axes are aligned parallel to the substrates as an active layer.