• Journal of the Korean Society of Propulsion Engineers
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• v.7 no.3
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• pp.1-7
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• 2003

In this research, it is intended to measure shape of the nozzle throat of the KL-3 engine, which is the main engine of the KSR-III rocket. For the purpose, an image-based method was invented to replace the 3D pointer, which is actually inaccessible to such large scale engines. As a result, our equipment showed satisfactory Performances. Analysing the results of experiments, we find that the pattern of ablation is determined by the spray pattern and that the process of thermal ablation phenomena can be categorized in three regimes - the first regime that the shape of nozzle throat is maintained and ablation is negligible, the second regime that saw-tooth form is developed and ablation is accelerated, and the third regime that the saw-tooth form is already established and the growth of ablation rate is reduced Also, we find that the ratio of area increase after 60 seconds combustion is +5.82% and conclude that the ratio is acceptable and satisfactory.

• Proceedings of the Korea Water Resources Association Conference
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• 2007.05a
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• pp.2089-2093
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• 2007

저수지군 연계운영 문제는 서로 상충되는 목적들이 존재하고, 다양한 평가 기준들이 존재하는 다목적 특성을 갖는 문제이다. 때문에 저수지군 연계운영 문제에 다중목적계획법이 많이 사용되고 있으나 문제의 해결을 위해 사용한 다수의 목적간의 가중치 설정에 의사결정자의 주관적요소가 반영 될 수도 있고, 설정된 가중치에 따라 결과 값이 민감하게 반응하여 의사결정자가 바람직한 가중치 설정에 어려움이 있다. 본 연구의 목적은 다중 목적 특성이 존재하는 저수지군 연계운영 문제에 다요소 의사결정기법 적용하여 바람직한 저수지별 저수 가중치를 선정하는 방법을 제안하는 것이다. 제안하는 저수 가중치 선정 절차는, 우선 GA-CoMOM (Genetic-Algorithm Coordinate Multi-reservoir Operation Model)을 통해 수계 전체 관점에서 저수량과 발전량의 상충되는 목적에 대한 파레토 최적해와 각 최적해에 해당하는 저수지별 저수 가중치를 도출한다. 다음 단계로 다요소 의사결정기법중에 하나인 수정된 거리척도 기반의 DEA 순위 선정 절차를 이용하여 도출된 최적해들의 운영 결과를 평가하여 파레토 최적해군 중에 선호해를 결정하고, 결정된 선호해의 저수지별 저수 가중치를 해당 기간의 저수 가중치로 선정한다. 설명한 선호 가중치 선정 절차를 금강 수계에 적용해 보고 저수지 연계운영에서 바람직한 가중치를 도출할 수 있음을 보인다.

• Journal of Korean Society of Forest Science
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• v.94 no.6
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• pp.431-440
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• 2005

Location, height and clear-length of individual tree can be measured directly by LiDAR Remote Sensing, and dbh(diameter at breast height) can be estimated indirectly by tree height measured by LiDAR. In addition, stand volume and stand biomass are computed from estimated growth factors. In this study, each estimated growth factor was compared to the field measurements to validate accuracy. The coefficient of determination of total tree heights was 0.66 for total trees, 0.68 for Pinus koraiensis, 0.66 for Larix leptolepis and 0.60 for Quercus spp. The coefficient of determination of clear-length was 0.79 for total trees, 0.73 for Pinus koraiensis, 0.79 for Larix leptolepis, 0.68 for Quercus spp. The coefficient of determination of dbh predicted was 0.73 for Pinus koraiensis, 0.73 for Larix leptolepis and 0.85 for Quercus spp. Moreover The coefficient of determination of basal area was 0.82 for Pinus koraiensis, 0.92 for Larix leptolepis and 0.95 for Quercus spp. Biomass per ha computed by growth factor using LiDAR was 40,306 dm/ha for Pinus koraiensis, 94,150 tdm/ha for Larix leptolepis and 94,481 tdm/ha for Quercus spp. by species.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2009.11a
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• pp.417-420
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• 2009

The purpose of the present study is to evaluate high temperature fracture toughness through the experimental and analytical method. The analysis method is proposed to simulate the fracture toughness of high temperatures. Load-COD curves of compact test specimen acquired by finite element method analysis using hypo elastic model are simulated to determine the crack initiation load on high temperatures. The results of experimental work are in accord with analysis in thermal shock test.

• 한국데이터정보과학회:학술대회논문집
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• 2004.04a
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• pp.175-181
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• 2004

This paper develops a course named $\ulcorner$Academic Itnernship Program$\lrcorner$ that is designed to be offered jointly by the Statistics department and the Mathematics department. Our aim of developing the course is as follows. This program enhance students' academic and career goals. This program provides students with opportunities to apply classroom theory to real world situations. Students learn a practical theory that is actually used in the real industry. This program enhance students' skills and abilities. This provide financial assistance. Students get a competitive edge in employment after graduation.

• Journal of the Korean Wood Science and Technology
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• v.35 no.1
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• pp.36-43
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• 2007

Elemental analysis, SEM-EDX, X-ray diffraction (XRD) and IR analysis were adopted to examine the quality of charred woods excavated from the underground of the Daewoongjeon Hall of Youngguksa Temple, Youngdong-gun, Chungbuk, Korea. A large amount of calcium was detected in SEM-EDX analysis. The analyses of chemical elements suggested that completely charred wood was carbonized at about $500^{\circ}C$. The XRD results indicated the destruction of cellulose crystalline region. The IR analysis exhibited that thermal degradation of wood component was different depending upon the carbonization temperature. It can be suggested from the results that PEG with different molecular weights should be used for the conservation of excavated charred woods.

• Proceedings of the Korea Society of Information Technology Applications Conference
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• 2002.11a
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• pp.440-449
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• 2002

본 연구는 최근 그 시장규모와 수요가 급격히 증가하고 있는 CMS의 평가방법론을 개발하기 위한 목적으로, CMS와 IT솔루션 평가이론에 대하여 고찰하여, CMS의 평가항목을 크게 '솔루션 특성', '공급벤더 역량', '구매업체 환경적합성'의 대항목으로 분류하고, '컨텐츠 관리기능', '비즈니스지원기능', '기술성', '경제성', '벤더수준', '서비스', '사후관리', '정보화계획적합성', '정보화설비적합성', '조직/인적자원적 합성'의 총 10가지 세부항목을 정의하였다. 또한 AHP 기법을 통하여 각 평가항목의 가중치를 결정하고, 과거 단순가중치법을 이용하여 도입된 CMS구매과정에 대한 사례연구를 실시하였다. 결과적으로 각 솔루션의 순위는 똑같이 결정되었으나, 과거 단순가중치법에 의해 산출된 각 솔루션의 득점비율과 본 사례연구를 통하여 도출된 상대적 선호도는 수치상 큰 차이가 존재하였다. 그 차이는 평가항목과 방법상의 차이에 의한 당연한 결과이지만, 솔루션의 선정이라는 중차대한 의사결정문제를 해결함에 있어, 보다 객관적이고 과학적인 방법론을 이용하여야 함을 시사하고 있다.

• Proceedings of the Korea Society for Industrial Systems Conference
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• 2002.11a
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• pp.440-449
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• 2002

본 연구는 최근 그 시장규모와 수요가 급격히 증가하고 있는 CMS의 평가방법론을 개발하기 위한 목적으로, CMS와 IT솔루션 평가이론에 대하여 고찰하여, CMS의 평가항목을 크게 "솔루션 특성", "공급벤더역량", "구매업체 환경적합성"의 대항목으로 분류하구 "컨텐츠 관리기능", "비즈니스지원기능", "기술성", "경제성", "벤더수준", "서비스", "사후관리", "정보화계획적합성", "정보화설비적합성", "조직/인적자원적합성"의 총 10가지 세부항목을 정의하였다. 또한 AHP 기법을 통하여 각 평가항목의 가중치를 결정하고, 과거 단순가중치 법을 이용하여 도입된 CMS구매과정에 대한 사례연구를 실시하였다. 결과적으로 각 솔루션의 순위는 똑같이 결정되었으나, 과거 단순가중치 법에 의해 산출된 각 솔루션의 득점비율과 본 사례연구를 통하여 도출된 상대적 선호도는 수치상 큰 차이가 존재하였다. 그 차이는 평가항목과 방법상의 차이에 의한 당연한 결과이지만, 솔루션의 선정이라는 중차대한 의사결정문제를 해결함에 있어, 보다 객관적이고 과학적인 방법론을 이용하여야 함을 시사하고 있다.

• Journal of Practical Engineering Education
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• v.13 no.2
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• pp.221-232
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• 2021

The purpose of this study is to explore the design direction of artificial intelligence convergence liberal arts subjects based on flip learning and maker education through analysis of learner needs in a non-face-to-face classroom environment caused by COVID-19. To this end, we analyzed the priorities of subject content elements by using the Borich needs assessment and The Locus for Focus model along with students' perceptions of flip learning for students who took and did not take maker education-based liberal arts courses. Based on this, it was used as basic data for designing the curriculum. The study results are as follows. First, the content elements of the artificial intelligence liberal arts curriculum based on maker education consisted of a total of 9 areas and were designed as a class using flip learning. Second, the areas with the highest demand for education are 'Artificial Intelligence Theory', 'Artificial Intelligence Programming Practice', 'Physical Computing Theory', 'Physical Computing Practice', followed by 'Convergence Project', '3D Printing Theory', '3D Printing practice' was decided. Third, most of the questionnaires regarding the application of flip learning in maker education-based artificial intelligence liberal arts subjects showed positive responses regardless of whether they took the course, and the satisfaction of the students was very high. Based on this, an artificial intelligence-based convergence liberal arts curriculum using flip learning and maker education was designed. This is meaningful in that it provides an opportunity to cultivate artificial intelligence literacy for college students by preparing the foundation for artificial intelligence convergence education in liberal arts education by reflecting the needs of students.

• The Journal of the Convergence on Culture Technology
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• v.7 no.4
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• pp.583-590
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• 2021

This study was attempted to identify the current status of education of gerontological nursing at nursing colleges across the country and to check whether 19 senior nursing competencies suggested by the American Association of Nursing Colleges are reflected in the courses. The subjects of this study were 198 nursing education institutions accredited by KABONE, and each university's website, department homepage, university handbook, admission-related information, curriculum table, and syllabus were collected and analyzed through an internet search engine. The collected syllabus and the most recent curriculum table of the elderly nursing course were checked and analyzed using SPSS 23.0. The current status of gerontological nursing management was presented by calculating the frequency and percentage, and the educational contents presented in the syllabus were analyzed based on 19 geriatric nursing competencies presented by AACN. 185 institutions (93.43%) operated the geriatric nursing subjects, 98 institutions (49.49%) offered theory subject, and 84 institutions (42.42%) offered both theory and practice. In the case of compulsory majors, 52.92% had the most, 27.84% for the first semester of the 4th year, and 53.54% for 2 credits. As a result of analyzing the lesson plan, communication-related educational competency was included in 40% of cases. As AACN gerontological nursing competency 'effective information provision ability for the elderly', 'ethical and non-coercive decision-making', 'care without restraint', 'safe and effective transition across levels of care' was not included in the education content. In conclusion, gerontological nursing education has been focused on disease, and effective information provision capabilities including communication with the elderly need to be reflected.