• 대한수학교육학회지:학교수학
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• 제15권4호
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• pp.921-940
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• 2013

본 연구는 Cabri 3D와 GSP를 이용하여 중심사영에 대한 탐구학습에서 나타나는 중학교 수학영재들의 수학적 사고특성과 교사의 역할을 분석하여 수학영재를 위한 교수 학습 자료의 개발에 시사점을 주는데 목적이 있다. 연구결과 중학교 수학영재들은 중심사영에 의한 도형의 변환을 탐구하고 이를 투시도의 작도를 통해 확인하는 과정에서 다양한 수학적 사고특성을 보였고, 교사는 학생들의 탐구문제해결을 위한 사고의 촉진과 새로운 지식의 형성을 도우면서 수업설계자, 학습촉진자, 기술적 보조자, 상담자의 역할을 하는 것으로 나타났다.

• 한국콘텐츠학회논문지
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• 제18권4호
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• pp.164-177
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• 2018

IoT 디바이스와 관련한 시장이 확대됨에 따라 이와 관련한 보안 침해 사고의 규모가 상당할 것으로 예측된다. 이에 따라 국내 정보보호와 관련한 법제 정비를 위한 움직임 또한 활발해지고 있으며, 강화된 정보통신망 법이 시행되었다. IoT 관련 침해 사고는 재정적 피해뿐만 아니라 인명 사고로도 이어질 수 있기 때문에, IoT 디바이스 보안에 큰 관심이 집중되고 있다. 본 논문에서는 IoT 디바이스가 갖춰야 할 필수 보안기능을 법제적 관점과 기술적 관점을 통해 시사점을 제시하고, 이와 관련한 기술들을 분석한다. 이는 Start-up 개발자나 IoT 디바이스 설계자에게 참고자료로 활용될 수 있다.

• Steel and Composite Structures
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• 제29권2호
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• pp.243-256
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• 2018

This study conducts an optimization and sensitivity analysis on rectangular reinforced concrete (RC) beam using Lagrangian Multiplier Method (LMM) as programming optimization computer soft ware. The analysis is conducted to obtain the minimum design cost for both singly and doubly RC beams according to the specifications of three regulations of American concrete institute (ACI), British regulation (BS), and Iranian concrete regulation (ICS). Moreover, a sensitivity analysis on cost is performed with respect to the effective parameters such as length, width, and depth of beam, and area of reinforcement. Accordingly, various curves are developed to be feasibly utilized in design of RC beams. Numerical examples are also represented to better illustrate the design steps. The results indicate that instead of complex optimization relationships, the LMM can be used to minimize the cost of singly and doubly reinforced beams with different boundary conditions. The results of the sensitivity analysis on LMM indicate that each regulation can provide the most optimal values at specific situations. Therefore, using the graphs proposed for different design conditions can effectively help the designer (without necessity of primary optimization knowledge) choose the best regulation and values of design parameters.

• 한국의류학회지
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• 제44권2호
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• pp.193-208
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• 2020

This study investigated similarities and differences between 2D flat sketch, 3D virtual clothing and real clothing images. Flat sketch, 3D virtual clothing, and real clothing images of T-shirts and dresses were made. Questionnaires were prepared for fit evaluation, sensory evaluation, and location evaluation. A survey of 440 questionnaires was collected from Chinese women in their 20s and 30s. As results of the sensibility evaluation, 3D virtual clothing expressed real clothing images slightly more similar than a 2D flat sketch. As results of the fit evaluation of the dresses, 2D flat sketch and 3D virtual clothing were rated as slightly longer/wider, and real clothing images were rated as slightly shorter/narrower. The results suggested that presenting 3D images with avatars as 3D virtual clothing images will provide more accurate fit evaluation results. This study presented possibilities and methods for apparel companies to utilize 3D system as an effective apparel production tool.

• The International Journal of Costume Culture
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• 제6권1호
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• pp.19-29
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• 2003

The 3D measurement data expected be useful to give appropriate garment fit and development of MTM(Made-to-Measure) CAD software. The researcher surveyed the need and use of national anthropometric data of the apparel industry. 17 Korean apparel manufacturers participated in the study. The need of anthropometric data at 5 different apparel business sectors was measured: men's suit, women's dress, casual-wear, underwear, and active sportswear. The result of the survey shows that height and bust, waist, hip circumferences are needed by all of the business sectors. The body measurements at the scye and upper arm area were need most by the men's suit manufacturers. The women's foundation garment manufacturers were well prepared for the use of the 3D body scan data and they expected the potential benefits of 3D body scan data would be great. The researcher also conducted a case study and found a pro and con of the using 3D body scan data for apparel product developing process. In the current stage of technical advance, a reasonable method was required to get nude like scan data for the women's foundation garment manufacturer. The researcher concluded that the apparel designer could use the 3D scan data for developing tremendous style garment design and pattern making.

• 복식문화연구
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• 제21권4호
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• pp.521-534
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• 2013

This study aims to identify the formative features of inflatable fashion that has changed its form or fulfilled specific functions by inserting air between fabrics or between clothes and the human body. Images of inflatable fashion images after the 1990s were collected from the literature and internet data and were analyzed based on the formative features of inflatable design. Through this analysis, it was determined that there were four formative features of inflatable fashion: First, inflatable fashion has functionality. General fashion also has functionality, but inflatable fashion has expanded functionalities such as an air bag effect or insulation due to injected air. Second, the formative potential. Inflatable fashion can be changed into different forms depending on the amount of air injected. Light-weighted air holds up the material of the clothes. So new forms that are different from conventional fashion, which gives inflatable fashion its formative potential, can be suggested. Third, aesthetic expansion. Inflatable fashion when its volume is expanded expresses the beauty of scale, or expresses a voluptuous beauty when part of human body is exaggerated. Fourth, it has an unconstructive characteristic. Space that is visible due to the transparent material of inflatable fashion expresses the intention of the designer to fulfill an unconstructive concept. In conclusion, the formative features of inflatable design have formative significances : practicality, aesthetic significance, semantics and technical significance.

• 복식
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• 제65권4호
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• pp.19-30
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• 2015

In recent years, various studies about 'Biomorphic design' have been conducted and accelerated among many recent design concepts and methodology. Therefore, this study classifies the types of biomorphic fashion design based on literature review, and select biomorphic fashion designs in the latest fashion designer's collection. This study aimed to determine the types and characteristics of the biomorphic design in fashion design, and analyze the characteristics and the interpreted intrinsic meanings through Greimas Semiotic rectangle model based on the Binary-Opposition of meaning and Isotophy. As the result of analysis, biomorphic designs in fashion are classified as three types: 'representational imitation of form', 'technical imitation of functional features', and 'imitation of symbolic attribute'. 'Representational imitation of form' was derived from an organic design through atypical forms, repetition and extension of figurative forms of nature, and 'the functionalities of the nature' are interpreted as the feature to maintain the condition of the life itself and to attempt to regulate the status of self-autonomy. Lastly, 'the imitation of symbolic attributes' is designing the process of creation, growth, expansion and destruction from circulation of nature.

• International Journal of Fluid Machinery and Systems
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• 제10권1호
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• pp.63-75
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• 2017

Many axial fans have circular arc blades with constant thickness. It is still a challenging task to calculate their performance, i.e. to predict how large their pressure rise and pressure losses are. For this task a need for cascade data exists. Therefore, the designer needs a method which works quickly for design purposes. In the present contribution a design method for such cascades consisting of circular arc blades with constant thickness is described. It is based on a singularity method which is combined with a CFD-data-based flow loss model. The flow loss model uses CFD-data to predict the total pressure losses. An interpolation method for the CFD-data are applied and described in detail. Data of measurements are used to validate the CFD-data and parameter variations are conducted. The parameter variations include the variation of the camber angle, pitch chord ratio and the Reynolds number. Additionally, flow patterns of two dimensional cascades consisting of circular arc blades with constant thickness are shown.

• 경영정보학연구
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• 제4권2호
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• pp.343-360
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• 2002

IS 프로젝트 성공요인의 하나로서 프로젝트 관리자는 항상 관심의 대상이 되어왔다. 본 연구는 IS 프로젝트 관리자가 갖추어야 될 지식과 기술이 무엇이며, 그러한 기술을 위하여 어떠한 경력개발 경로가 필요한지를 알아보고자 하는 것이다. 프로젝트 관리자에게 필요한 지식과 기술은 기업의 경영전략을 이해하고 IS 전략계획으로 연결하는 능력, 전사적 업무기능을 이해해야 하는 현업 업무력, 새로운 업무를 위한 혁신, 프로젝트 계획과 통제와 같은 일반관리, 의사소통과 리더십과 관련된 인간관계의 관리력, IS 개발에 관련된 기술적 전문성 등의 6 가지로 밝혔다. IS 프로젝트 관리자를 양성하기 위한 경력개발 경로로는 엔지니어, 분석가, 기획가, 프로젝트 리더 등을 거치면서 프로젝트 관리자로 성장하게 되는 모형을 제시하였다. 이러한 연구는 우수한 프로젝트 관리자를 양성하여 IS 프로젝트의 성공 확률을 높이고, 나아가 정보산업의 경쟁력 제고에 도움이 되는 방안을 모색하게 해 줄 것이다.

• 한국CDE학회논문집
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• 제12권3호
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• pp.163-170
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• 2007

A torque converter, connected to a transmission/transaxle input shaft, connects, multiplies and interrupts the flow of engine torque into the transmission. Damper springs are usually equipped in a torque converter to convert stably the torque power supplied from engine. Damper Springs generally have the most flexible design variables among vehicle transmission parts, so that they could be effective design factors to improve the entire vehicle's performance. Damper spring, however, has geometric complexity after it equipped in a torque converter. For that reason, modeling a damper spring requires expert's knowledge to determine many design parameters and satisfy the functional requirements at the same time. In this paper, we introduce an optimum design method applied in detailed-design stage to reduce design process and financial loss caused by adequate design. Many design variables have to be classified and structuralized for Optimization. This also could make designer concentrate on functional requirements of damper spring, not on design possibility. In addition, modeling an assembled spring has technical restriction with primitives of the current major CAD solutions because of complexity of assembled spring shape. Thus, one of modeling solution presented in this paper since detailed and exact modeling is important for CAE or DMU.