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      • KCI등재

        사이버대 영어학습자들의 중도탈락 예방을 위한 아카데믹 리터러시 평가 모형 개발

        김주혜 한국중등영어교육학회 2020 중등영어교육 Vol.13 No.2

        Online courses tend to have higher dropout rates than traditional offline classes. To determine the causes of this phenomenon, a diagnostic questionnaire for measuring the academic literacy of online English learners was developed in this study. The survey questionnaire, 'Academic Literacy for Online English Learners', consisted of questions on university system literacy, digital literacy, information literacy, and language literacy. A survey was conducted on 215 English learners at K Cyber University, and interviews with 11 students were administered for triangulation. To analyze the questionnaire results, descriptive statistics, t-tests, and ANOVA were conducted. According to the survey results, the participants were in relatively low levels in the following academic literacy aspects: 1) how to use the university's Learning Management System and the counseling/support systems. 2) how to solve network failures or security problems 3) how to back up/restore files or install/delete software for their study 4) English (speaking, writing, and listening) literacy for college classes. The results also showed that the participants in their 50s had significantly lower levels of overall academic literacy, digital literacy, and information literacy than those in their 20s and 30s. Subsequent qualitative analyses also supported these quantitative results. Based on these findings, some recommendations are made to prevent dropout of online English learners.

      • KCI우수등재

        면씨 껍질의 물리적 구조와 화학적 조성

        김주혜,김성훈,Ian R. Hardin 한국섬유공학회 2001 한국섬유공학회지 Vol.38 No.12

        The physical structure and chemical composition of the cotton-seed were examined with special interest focused on the attachment of cotton fibers to the seed coat. Hand-cut cross sections of the seed coat showed six layers distinctively: outer epidermis, outer pigment, color-less, palisade, inner pigment, and inner epidermis layer. The structure between the fibers and the seed coat was studied using optical microscopes and a scanning electron microscope. The fibers were located between outer epidermis cells and the roots of the fibers were attached to the surface of the outer pigment layer. Microtomed thin sections were used to identify chemical compositions of the layers. A series of stains was chosen to identify the chemical components such as lignin, tannin, lipid, and pectin in the seed coat. Ruthenium Red, which stains pectin, was of particular interest because the Ruthenium Red stained between the outer epidermis and the fiber shank. The results suggest that pectin is the material bonding fibers to the seed coat.

      • KCI등재

        FDG PET-CT in the Diagnosis of Takayasu Arteritis Presenting as Fever of Unknown Origin: A Case Report

        김주혜,오명돈 대한감염학회 2015 Infection and Chemotherapy Vol.47 No.3

        Takayasu arteritis is a chronic vasculitis involving the large vessels. At diagnosis, ischemic symptom are usually present in the affected vessels. However, fever of unknown origin (FUO) is rare as an initial presentation and renders the condition difficult to diagnose. In this case report, we describe a patient who presented with a fever of unknown origin. A 68-year-old female was diagnosed with Takayasu arteritis after fluorodeoxyglucose (FDG) positron-emission tomography-computed tomography (PET-CT) was performed at the prepulseless stage. FDG PET-CT can assist in the early diagnosis of Takayasu arteritis patients with FUO and can improve the prognosis of such patients.

      • KCI등재후보

        초등학교 통합학급교사의 장애학생에 대한 교수수행 평가도구 개발 기초연구

        김주혜,박은혜 이화여자대학교 특수교육연구소 2009 특수교육 Vol.8 No.1

        Even though there are ongoing discussions to ensure the quality of inclusion for the students with disabilities, no appropriate evaluation tools or standards measure the quality of instruction of the inclusive classes. The purpose of this study is, therefore, to propose an evaluation tool to improve the teaching quality of teachers in charge of inclusive classes. The first draft of the categories and items were developed based on the rigorous literature review. Then, a pilot survey was conducted with 35 special educators and general educators. They were provided with the first draft of the tool and a real instruction video. Some modifications were made on the basis of the results of this pilot survey, resulting in the second draft. Several relevant experts then reviewed this draft for the validity of the categories and items of the tool. A larger scale survey was conducted to 130 special education teachers to assess the appropriateness of the evaluation items both in terms of the content and the expression. AMOS 4.1 program was used to conduct confirmatory factor analysis. Finally, a evaluation tool was developed, including 4 categories related to the teaching activities (Instructional design, implementation of instruction, interaction, class atmosphere) and of 25 individual question items. Implications of this study and suggestions for future research were discussed. 장애학생이 통합된 상황의 질에 대한 논의가 이루어지고 있으나 실질적으로 장애학생이 참여하는 수업에 대한 질을 측정할 수 있는 도구는 부족한 실정이다. 이에 본 연구에서는 통합학급수업을 담당하고 있는 일반교사의 장애학생에 대한 교수활동의 질을 개선할 수 있는 교수수행 평가도구를 개발하고자 하였다. 관련 문헌 및 선행연구들을 분석하여 일차로 평가영역과 문항을 구성하고 현장 전문가들의 검토 및 특수교사와 통합학급교사들을 대상으로 하는 예비조사를 통해 내용타당도를 검증받았다. 개발된 평가 도구는 수업활동 단계에 따른 4개의 평가 영역(교수설계, 교수실행, 상호작용, 교실분위기)과 25개의 문항으로 구성되었으며, 특수교사 121명에게 문항의 적절성에 대한 설문을 실시한 후 AMOS 4.1프로그램으로 확인적 요인분석을 실시하였다. 통합교육에서의 통합학급 교사의 역할의 중요성이 강조되는 최근의 동향에 비추어 본 연구결과로 개발된 통합학급교사의 장애학생에 대한 교수수행 평가 도구는 단순히 평가도구로서뿐 아니라 통합교사의 교수적 역할에 대한 준거로서도 그 의미가 있는 것으로 사료된다.

      • KCI등재

        Development of a New Metal Artifact Reduction Algorithm by Using an Edge Preserving Method for CBCT Imaging

        김주혜,남혜원,이레나 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.67 No.1

        CT (computed tomography) images, metal materials such as tooth supplements or surgical clips can cause metal artifact and degrade image quality. In severe cases, this may lead to misdiagnosis. In this research, we developed a new MAR (metal artifact reduction) algorithm by using an edge preserving filter and the MATLAB program (Mathworks, version R2012a). The proposed algorithm consists of 6 steps: image reconstruction from projection data, metal segmentation, forward projection, interpolation, applied edge preserving smoothing filter, and new image reconstruction. For an evaluation of the proposed algorithm, we obtained both numerical simulation data and data for a Rando phantom. In the numerical simulation data, four metal regions were added into the Shepp Logan phantom for metal artifacts. The projection data of the metal-inserted Rando phantom were obtained by using a prototype CBCT scanner manufactured by medical engineering and medical physics (MEMP) laboratory research group in medical science at Ewha Womans University. After these had been adopted the proposed algorithm was performed, and the result were compared with the original image (with metal artifact without correction) and with a corrected image based on linear interpolation. Both visual and quantitative evaluations were done. Compared with the original image with metal artifacts and with the image corrected by using linear interpolation, both the numerical and the experimental phantom data demonstrated that the proposed algorithm reduced the metal artifact. In conclusion, the evaluation in this research showed that the proposed algorithm outperformed the interpolation based MAR algorithm. If an optimization and a stability evaluation of the proposed algorithm can be performed, the developed algorithm is expected to be an effective tool for eliminating metal artifacts even in commercial CT systems.

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