• Journal of the Computational Structural Engineering Institute of Korea
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• v.25 no.1
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• pp.73-80
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• 2012

It is important to design the optimal shape in the initial process because the influences on the design and construction are large according to the shape and pattern of spatial structures. However, the existing optimal shape designs for spatial structure are performed by the designer's intuition and experiences. Therefore, this study proposes the integrated process using the topology optimization and cellular automata model. First, the initial optimal shapes are obtained by using the topology optimization, and then the spatial truss structural patterns are created through the application of cellular automata rules. Finally, the optimal shapes to satisfy the various design conditions are generated by the structural analysis and size optimization.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2011.04a
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• pp.215-218
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• 2011

An air data acquisition algorithm has been developed for the supersonic flow at the preliminary design stage with pressure data acquisition device composed of major three total pressure sensors and two static pressure sensors. Through this algorithm, Mach number, angle of attack and sideslip angle can be very easily derived with simple interpolation algorithm and predefined data tables. In this preliminary design stage, to verify the developed algorithm, the data tables are constructed with data driven by Taylor Maccoll equation. Furthermore, these data are compared and modified with computational results based on CFD analysis. The present algorithm would be useful to get supersonic air data for the various aerial vehicles and their flight tests.

• Proceedings of the KAIS Fall Conference
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• 2012.05a
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• pp.415-418
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• 2012

기술기반의 창업에 대한 중요성이 커지고 있는데 반해 그 방법론은 매우 취약한 상태이다. 본 연구는 창업과정에서 독특한 기술을 기반으로 어떻게 새로운 제품 및 서비스 아이디어를 만들 것인가에 대한 방법론을 다루고 있다. 본 연구에서는 이를 초기단계의 시장조사, 기술 스캐닝, 트랜드 분석, 웹기반의 정보, 명료화 등 5가지로 정리할 것이다.

• 전기의세계
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• v.20 no.6
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• pp.29-36
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• 1971

초고압송전계통의 주요 사양중에서 특히 고속도재폐로방식은, 선로개패이상전압의 크기에 관련되는 차단기의 사양과 계통신뢰도를 결정하는 보호계전장치의 주요한 결정요소가 된다. 따라서 가장 합리적인 개폐로방식을 선택할려면 계통발전의 초기상태에서 부터 최종 단계의 계통규모와 계통운용기준을 충분히 검토하여야 한다. 본 고에서는 초고압계통에 적용되는 최근의 재폐로방식 경향과 우리가 발전시키려는 계통규모에 적합한 재폐로방식을 비교검토한다.

• The Journal of Sustainable Design and Educational Environment Research
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• v.23 no.2
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• pp.1-10
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• 2024

This study presents a model for educational planning based on user participatory design for the purposes of curriculum development and educational space innovation. It reviewed previous research and practices related to educational space innovation, educational planning processes, and user participation design and suggested a draft model. This model was applied in the renovation project of an elementary school, and the problems encountered during the application were reflected upon and used to improve the model. The final model comprises four phases. Phase 1 is an initial exploratory phase foruser participation, where educational planners and users form a shared perspective regarding the future of education. Phase 2 is a needs-analysis phase for the transition to future education, which focuses on setting the overall direction of the school-level curriculum. Phase 3 specifies the direction of future school curricula and identifies needs for educational spaces. Finally, Phase 4 focuses on the interaction between educational and space planners. Based on the above discussion, the study discussed the benefits and limitations of this educational planning model for school space innovation.

• Journal of the Korean Geotechnical Society
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• v.17 no.2
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• pp.113-122
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• 2001

소성이 높은 고함수비를 갖는 준설점토에 대한 침강 및 자중압밀 특성에 대한 연구는 국내외에서 활발하게 진행되고 있는 반면, 비소성 준설토에 대한 침강, 퇴적 특성에 대한 연구는 국내뿐만 아니라 국외에서도 거의 진행되지 않고 있는 실정이다. 일반적으로 비소성 준설토는 침강 및 퇴적 단계에서 고소성의 준설점토와 다른 거동 특성을 나타낸다. 본 논문에서는 비소성 준설토에 대한 실내 침강압밀실험을 실시하여 비소성 준설토의 퇴적 및 침강 현상을 제시하였다. 또한 퇴적고 관찰이 이루어진 준설토에 대한 퇴적특성 분석을 통하여 계면고 관찰이 이루어진 준설토에 대한 퇴적 현상을 해석하였으며, 이를 통하여 비소성 준설토에 대한 침강 및 퇴적 거동을 예측하였다. 또한 초기 및 최종 퇴적고에 대한 상관관계, 최종 퇴적고 및 최종 계면고에 대한 상관관계 분석을 통하여 비소성 준설토의 거동 특성을 분석하였다.

• International Journal of Highway Engineering
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• v.8 no.1 s.27
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• pp.77-87
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• 2006

Dynamic stability (DS) in the wheel tracking (WT) test is used as a basic index of rut-resistance for asphalt mixtures. In general, the deeper rut depth is obtained from the weaker mixture, resulting in the lower DS value. On the other hand, the shallower rut depth is obtained from the stronger mixture, resulting in the higher DS. However, it is not always the case when the DS is calculated by the existing method because the DS is simply determined based on the slope at the final stage of the rut depth-cycle curve. Specifically, in the case of the depth-cycle curve showing a steeper slope in the early part but flatter slope in last part, the DS is calculated to be higher than the curve showing a ever-increasing slope throughout the test. As long as the last part of slope is flatter, the deeper final rut depth is evaluated to show a higher DS than the little final rut depth. Therefore, a reasonable method for DS evaluation need to be established. Several new methods were suggested by considering the early, middle and final parts of rut depth to determine a reasonable DS. The results have shown that those new methods have demonstrated a significant improvement in distinguishing similarly performing mixtures. The result also showed that $DS_2$ had better correlation with SD than any other methods , representing the rutting resistance of asphalt mixture very well. The new DS calculation method is relatively simple and easy to follow. More validatin study is required for practical application.

• The Journal of the Korea Contents Association
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• v.16 no.8
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• pp.568-579
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• 2016

This study tried to design survey questions to inquire continuity in the English curriculum between elementary and middle school by integrating English teachers' opinions. To achieve this goal, the authors designed three-step development procedure. First, to set fundamental structure of the research, the researchers elicited main keywords by adopting Keyword Extraction toward precedent studies. Next, implemented a survey to 102 English teachers and analyzed their quantitative and qualitative responses. Among them, 22 teachers were selected as interviewee. Based on the results drawn from the pilot survey and the interview, this study suggested a survey, containing 40 questions designed to examine seven factors and 3 open-ended questions, to be utilized in researching cognition of continuity of the English curriculum.

• The Transactions of the Korea Information Processing Society
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• v.7 no.2
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• pp.542-551
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• 2000

In this paper, a novel technique is presented for automatic brain region segmentation in single channel MR image data sets for 3D visualization and analysis. The method detects brain contours in 2D and 3D processing of four steps. The first and the second make a head mask and an initial brain mask by automatic thresholding using a curve fitting technique. The stage 3 reconstructs 3D volume of the initial brain mask by cubic interpolation and generates an intermediate brain mask using morphological operation and labeling of connected components. In the final step, the brain mask is refined by automatic thresholding using curve fitting. This algorithm is useful for fully automatic brain region segmentation of T1-weighted, T2-weighted, PD-weighted, SPGR MRI data sets without considering slice direction and covering a whole volume of a brain. In the experiments, the algorithm was applied to 20 sets of MR images and showed over 0.97 in comparison with manual drawing in similarity index.

• Nuclear Engineering and Technology
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• v.14 no.3
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• pp.122-137
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• 1982

Analyzed is the sensitivity of reactor transient behavior to various reactor parameters during the reactivity induced accidents (RIA) of the Kori Unit 1. Included in the analysis is a partial spectrum of RIAs with relatively fast transients such as uncontrolled rod cluster control assembly bank withdrawl from a subcritical or low power startup condition and rod ejection accidents. The analysis can be performed generally in three steps: calculation of an average core power change, hot spot heat transfer calculation and DNBR (departure from nucleate boiling ratio) calculation. The computer codes used for the analysis are either developed based on the codes relevent to it. These codes are evaluated to be highly reliable. An extensive sensitivity analysis is performed to study the effects of various reactor design and operating parameters on the reactor transient behavior during the accidents. The assumptions and initial conditions used for the RIA analysis in the Kori Unit 1 FSAR (Final Safety Analysis Report) are reexamined, and the corresponding analysis results are reassessed, based on the sensitivity analysis results, to be conservative and reliable.