• 영어어문교육
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• 제8권1호
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• pp.165-198
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• 2002

The purpose of this research is to improve the writing ability of students by an ideal test model of English writing based on strategies of procedural learning stages enhancing the level of students' writing ability. Assessment of writing in the field of English education has been limited so far to very restricted areas with no appropriate scientific scrutiny. Assessment is really meaningful only when it exactly estimates the ability of students. Since English writing competence has become indispensable in this era of global village, writing instruction should be most emphasized. The most forceful method of busting writing instruction is to utilize the so-called washback effect of testing. So, to develop a good test model of writing, the first thing that is required is to inspect writing strategy in steps and, then, testing itself. First of all, analyzed with a special reference to the 6th high school English curriculum were the goals and contents of the syllabus reflected in one kind of junior high textbook and eight different kinds of senior high textbooks. Then questionnaires on the whole area of writing and tendencies of English writing classes were given to 100 English teachers, 300 students. The results of questionnaires were statistically analyzed. Then, some suggestions and opinions about the questioning method were made: the procedural strategy in steps, English writing instruction and test model of assessment were applied to the syllabus referring to teaching plans. On the bases of the results of the questionnaires, three pretests and a final test of English writing were administered to verify the effect of enhanced English writing competence which had been gradually promoted and, through the promotion, produced the test criteria of English writing. In conclusion, guidance and evaluation of English writing through in steps are really indispensable to increase student's practical ability and, accordingly, we are in need of the development of a testing method of useful writing practiced in school class above anything else. So, it is necessary to further the study on methods to assess writing ability on the bases of participation and fluency of students with their keen interest in English. Also, to intensify the effect of the test model, more accommodating reorganization of syllabus is required in our education. For instance, we need a flexible operation in organizing time units from the current 50 minutes to 100-130 minutes.

• 디지털융복합연구
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• 제11권10호
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• pp.437-443
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• 2013

본 논문은 여행지에서 스마트폰을 이용해 맛집을 검색하여 방문하는 앱을 수행해 봄으로써 스마트폰의 활용도를 높였다. 구현된 앱을 가지고 맛집을 검색하면 최적의 맛집을 선택할 수 있다. 특히 본 앱은 각 지역별로 적합한 메뉴, 식당의 스타일 및 디자인, 가격의 합리성, 종업원의 인적서비스 및 위생 관리 등의 활용도 및 만족도를 통하여 평가되고 입력된 정보를 미리 DB에 등록해 두고 개인적인 취향을 기록해 두기 위해 평점을 분류해서 입력하도록 배치하였으며, 본인의 추억을 기록할 입력란을 추가해 두었다. 더불어 교통편에 대한 정보 필드도 설계하여 여행의 접근성도 높였으며, 향후 여행지 맛집은 물론 유명 관광지, 지인의 집 정보 입력 등으로 DB를 확장해서 활용 가능하다.

• JSTS:Journal of Semiconductor Technology and Science
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• 제10권1호
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• pp.66-77
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• 2010

Improvement in breakdown voltage ($BV_{ds}$) and speed of the device are the key issues among the researchers for enhancing the performance of HEMT. Increased speed of the device aspires for shortened gate length ($L_g$), but due to lithographic limitation, shortening $L_g$ below sub-micrometer requires the inclusion of various metal-insulator geometries like T-gate onto the conventional architecture. It has been observed that the speed of the device can be enhanced by minimizing the effect of upper gate electrode on device characteristics, whereas increase in the $BV_{ds}$ of the device can be achieved by considering the finite effect of the upper gate electrode. Further, improvement in $BV_{ds}$ can be obtained by applying field plates, especially at the drain side. The important parameters affecting $BV_{ds}$ and cut-off frequency ($f_T$) of the device are the length, thickness, position and shape of metal-insulator geometry. In this context, intensive simulation work with analytical analysis has been carried out to study the effect of variation in length, thickness and position of the insulator under the gate for various metal-insulator gate geometries like T-gate, $\Gamma$-gate, Step-gate etc., to anticipate superior device performance in conventional HEMT structure.

• 복식문화연구
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• 제20권1호
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• pp.18-35
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• 2012

The purpose of this study is to offer a holistic description of the role demanded of costume designers to provide qualitative improvement of costume designs for small- and medium-sized musicals. The study accomplishes this by analyzing the relationship between the play and costume design in musicals and also by examining the process and environments in which costumes of small-sized theater companies' original musicals are produced. The methods of study are empirical research of literature related to dress, stage art, and culture & arts from both domestic and foreign publications; research of visual materials related to plays; and production and analysis of theatrical performances in which the researcher has participated as a costume designer. The results of the study are as follows. First, professionalism of the play and visual perfection of the work may be enhanced by costume designers actively participating in meetings with staff from each field of the play. Second, by taking advantage of the unique aspects of the work environment of small-sized theater companies' small- and medium-sized original musicals, such as harsh situations of regular and periodical meetings with all staff member, the designer may consider the director's intentions and concepts of the play, but should display more creative and autonomous design abilities. Third, because the costume designers of small- and medium-sized original musical plays are given a small budget and short production periods, the ability to systematically manage budget and production periods and the ability to flexibly handle unexpected incidents during the play is essential.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2004년도 제22회 춘계학술대회논문집
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• pp.75-78
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• 2004

Various jet engines (Turbine engine family and RAM Jet engine) have been developed for high speed aircrafts. but their application to hypersonic flight is restricted by principle problems such as increase of total pressure loss and thermal stress. Therefore, the development of next generation propulsion system for hypersonic aircraft is a very important subject in the aerospace engineering field, SCRAM Jet engine based on a key technology, Supersonic Combustion. is supposed as the best choice for the hypersonic flight. Since Supersonic Combustion requires both rapid ignition and stable flame holding within supersonic air stream, much attention have to be given on the mixing state between air stream and fuel flow. However. the wider diffusion of fuel is expected with less total pressure loss in the supersonic air stream. So. in this study the direction of fuel injection is inclined 30 degree to downstream and the total pressure of jet is controlled for lower penetration height than thickness of boundary layer. Under these flow configuration both streams, fuel and supersonic air stream, would not mix enough. To spread fuel wider into supersonic air an aerodynamic force, baroclinic torque, is adopted. Baroclinic torque is generated by a spatial misalignment between pressure gradient (shock wave plane) and density gradient (mixing layer). A wedge is installed in downstream of injector orifice to induce an oblique shock. The schlieren optical visualization from side transparent wall and the total pressure measurement at exit cross section of combustor estimate how mixing is enhanced by the incidence of shock wave into supersonic boundary layer composed by fuel and air. In this study non-combustionable helium gas is injected with total pressure 0.66㎫ instead of flammable fuel to clarify mixing process. Mach number 1.8. total pressure O.5㎫, total temperature 288K are set up for supersonic air stream.

• 한국추진공학회지
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• 제17권6호
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• pp.20-29
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• 2013

배플이 있는 마이크로 연소기의 난류유동 및 연소특성이 레이놀즈 응력 모형에 의하여 조사되었다. 형상변화에 따른 난류 연소유동 대한 영향을 살펴보기 위하여, 여러 개의 배플형상이 선택되었다. 유동구조와 온도장의 상관관계가 재순환 영역, 화염크기, 열손실 변화에 의해 조사되었다. 유동혼합은 연료 유입구의 직경을 감소시키는 것보다 공기유입구의 직경을 감소시키는 것이 더 효율적이었다. 연료 또는 공기유입구의 직경이 감소함에 따라 연소효율은 증가하였고, 화염길이는 감소하였다. 또한, 공기유입구의 직경이 감소함에 따라 연소온도와 열손실이 증가하고, 반면에 연료유입구의 직경이 감소함에 따라 연소온도와 열손실은 감소되었다.

• 한국재료학회:학술대회논문집
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• 한국재료학회 2009년도 춘계학술발표대회
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• pp.24.1-24.1
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• 2009

The zinc oxide (ZnO) material as the II-VI compound semiconductor is useful in various fields of device applications such as light-emitting diodes (LEDs), solar cells and gas sensors due to its wide direct band gap of 3.37eV and high exciton binding energy of 60meV at room temperature. In this study, the ZnO nanorods were deposited onto homogenous buffer layer/Si(100) substrates by a hydrothermal synthesis. The Effects of the buffer layer annealing and post annealing temperature on the structural and optical properties of ZnO nanorods grown by a hydrothermal synthesis were investigated. For the buffer layer annealing case, the annealed buffer layer surface became rougher with increasing of annealing temperature up to $750^{\circ}C$, while it was smoothed with more increasing of annealing temperature due to the evaporation of buffer layer. It was found that the roughest surface of buffer layer improved the structural and optical properties of ZnO nanorods. For the post annealing case, the hydrothermally grown ZnO nanorods were annealed with various temperatures ranging from 450 to $900^{\circ}C$. Similarly in the buffer layer annealing case, the post annealing enhanced the properties of ZnO nanorods with increasing of annealing temperature up to $750^{\circ}C$. However, it was degraded with further increasing of annealing temperature due to the violent movement of atoms and evaporation. Finally, the buffer layer annealing and post annealing treatment could efficiently improve the properties of hydrothermally grown ZnO nanorods. The morphology and structural properties of ZnO nanorods grown by the hydrothermal synthesis were measured by atomic force microscopy (AFM), field emission scanning electron microscopy (SEM), and x-ray diffraction (XRD). The optical properties were also analyzed by photoluminescence (PL) measurement.

• 한국지구물리탐사학회:학술대회논문집
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• 한국지구물리탐사학회 1999년도 제2회 학술발표회
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• pp.21-36
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• 1999

전기비저항 탐사는 국내에서 가장 성공적으로 적용되고 있는 물리탐사 기술의 하나로서 최근에는 토목 건설분야의 지반조사 등에서의 역할이 증대되고 있다. 이와 같은 역할의 증대에 따라 더욱 정확한 해석기법의 등장이 요구되었으며, 특히 국내의 경우 매우 복잡한 지질구조와 험난한 지형여건을 고려할 수 있는 해석기술이 요구되고 있다 이러한 맥락에서 최근에 3차원 전기비저항 탐사자료의 역산기술이 개발되었다. 개발된 3차원 전기비저항 역산법은 유한요소법을 이용한 3차원 전기비저항 모델링 알고리듬을 근간으로 함으로써 국내와 같이 험난한 지형 및 복잡한 지질구조에 대하여 정확한 지하구조의 3차원 영상을 제공할 수 있으며, 특히 ACB법 (Active Constraint Balancing method)의 채용으로 지하구조에 대한 분해능의 향상을 기대할 수 있게 되었다. 개발된 3차원 영상화 기술을 토대로 토목${\cdot}$건설분야의 지반조사에 3차원 전기비저항 탐사가 동원되고 있으며, 지반조사 대상지역에 있어서 중요한 지하구조에 대한 정보인 기반암 심도, 연약대 및 파쇄대 발달상황, 지하공동의 분포 등을 제공할 수 있었다.

• 한국해양바이오학회지
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• 제6권2호
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• pp.84-101
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• 2014

The aim of this project is to develop an adaptive and collective National Marine Biotechnology Plan for the next decade(2014~2023) which is able to reflect current and future changing environment. This effective strategy targets to foster marine-derived active bio-materials, marine bioenergy production technology and many promising technologies in order to promote marine biotechnology industry as a next-generation growth engine. Marine biotechnology industry based on R&D activities since 1980 has been growing as an emerging industry. This new field enables to secure exclusive patent rights and to find new potential bio-active materials from the ocean that requires long-term aggressive R&D investments. The current policy direction is to raise appropriate level of R&D investment because the current Korea's national marine biotechnology R&D fund ratio is less than 2% of the total national biotechnology R&D budget. The result shows three major strategies. First, it recommended a research implementation system and supporting policy that includes establishment of open innovation framework for the 'Industry-Academia-Research Institute Collaborations', strategic research planning and enhanced policy making process. Second, it derived state-of-the-art or new technology in many areas. Third, it formulated more detailed execution plans for successful R&D support and set up performance indicator system in related R&D program.

• 생명과학회지
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• 제23권12호
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• pp.1420-1427
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• 2013

이전에 새로운 아세틸알긴산 아세틸분해효소(acetylalginate esterase, AcAlgE)를 Sphingomonas sp. MJ-3 균주로부터 클로닝하고 특성을 보고한 바 있다. 본 연구에서는 Pseudomonas aeruginosa로부터 얻은 아세틸알긴산을 분해하는데 미치는 MJ-3 AcAlgE와 KS-408 알긴산 분해효소의 상승효과를 고-자기장 $^1H$-NMR과 peptide column을 장착한 FPLC를 이용하여 조사하였다. 알긴산 분해효소 coupled assay 법으로 측정한 결과 AcAlgE 효소는 산가수 분해하여 얻은 저분자 아세틸알긴산을 분해하는 것보다 고분자 아세틸알긴산을 분해하는 경우 낮은 활성을 보였다. 아세틸알긴산을 알긴산 분해효소로 분해하는 경우 먼저 AcAlgE로 아세틸알긴산의 아세틸기를 분해하여 제거한 후에야 KS-408 알긴산 분해효소의 활성이 높은 것으로 나타났다. 이러한 결과는 재조합 AcAlgE는 알긴산 분해효소에 의한 아세틸알긴산의 분해효과를 상승시킨다는 사실을 보여준다.