• 한국산학기술학회논문지
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• 제11권11호
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• pp.4310-4319
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• 2010

지식정보화 사회로의 진전이 가속화 되는 21세기에 공학도들에게 창의적 문제해결능력이 무엇보다 강조되고 있는데, 이러한 능력 개발을 위한 접근방식은 다양할 것이다. 본 연구는, 문제중심학습(PBL)이 그러한 접근방식에 있어 하나의 효과적인 대안으로 인식하고, 기존의 PBL모형에 기초하지만 대학 공학설계수업에 적합하도록 독자적으로 개발하고 그 효과를 수업현장에서 검증해 본 'JPBL' 모형을 소개하는 것을 주목적으로 하였다. 효과분석 결과, JPBL 수업을 받기 전과 후의 수업만족도와 조직몰입도는 통계적으로 유의한 차이가 있었으며, 이러한 양적인 결과는 질적자료 분석에서도 확인할 수 있었다. 이러한 연구결과에 터해 JPBL 모형 개발의 의미와 한계에 대해 논의하였다.

• Journal of Information Processing Systems
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• 제15권3호
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• pp.694-706
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• 2019

In this study, we applied the long short-term memory (LSTM) model to classify the cryptocurrency price time series. We collected historic cryptocurrency price time series data and preprocessed them in order to make them clean for use as train and target data. After such preprocessing, the price time series data were systematically encoded into the three-dimensional price tensor representing the past price changes of cryptocurrencies. We also presented our LSTM model structure as well as how to use such price tensor as input data of the LSTM model. In particular, a grid search-based k-fold cross-validation technique was applied to find the most suitable LSTM model parameters. Lastly, through the comparison of the f1-score values, our study showed that the LSTM model outperforms the gradient boosting model, a general machine learning model known to have relatively good prediction performance, for the time series classification of the cryptocurrency price trend. With the LSTM model, we got a performance improvement of about 7% compared to using the GB model.

• 한국의류학회지
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• 제43권4호
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• pp.459-473
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• 2019

This study analyzes a new aesthetic value of fashion design utilizing media art technology based on Marshall McLuhan's media theory, vitalize a creative fashion design by applying media art technology into traditional fashion design and discover the possibility of various formative expressions. The result of the analysis under the three criterion extracted through the examination of other art genre such as dance, music, architecture and painting are as follows. First, new concept clothing was designed in the way of combining science and technology with existing costume designs. Second, applying technology based media art images on clothes has been noticeably effected by changes to clothing surfaces. Third, fashion design using technology based media art stimulates the five senses and creates new communication structures. In conclusion, this study reveals that fashion design utilizing technology based media art, an innovative medium for future fashion development in digital society, has expanded the boundaries of fashion design beyond limits and contributed to diversity in creative fashion design.

• ETRI Journal
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• 제43권5호
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• pp.891-899
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• 2021

We propose a stray inductance extraction method on power modules of the few-kilovolts/several-hundred-amperes class using only low voltages and low currents. The method incorporates a double-pulse generator, a level shifter, a switching device, and a load inductor. The conventional approach generally requires a high voltage of more than half the power module's rated voltage and a high current of around half the rated current. In contrast, the proposed method requires a low voltage and low current environment regardless of the power module's rated voltage because the module is measured in a turn-off state. Both theoretical and experimental results are provided. A physical circuit board was fabricated, and the method was applied to three commercial power modules with EconoDUAL3 cases. The obtained stray inductance values differed from the manufacturer-provided values by less than 1.65 nH, thus demonstrating the method's accuracy. The greatest advantage of the proposed approach is that high voltages or high currents are not required.

• Journal of Microbiology and Biotechnology
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• 제31권10호
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• pp.1393-1400
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• 2021

Acetone-butanol-ethanol (ABE) fermentation by the anaerobic bacterium Clostridium acetobutylicum has been considered a promising process of industrial biofuel production. Phosphotransbutyrylase (phosphate butyryltransferase, PTB) plays a crucial role in butyrate metabolism by catalyzing the reversible conversion of butyryl-CoA into butyryl phosphate. Here, we report the crystal structure of PTB from the Clostridial host for ABE fermentation, C. acetobutylicum, (CaPTB) at a 2.9 Å resolution. The overall structure of the CaPTB monomer is quite similar to those of other acyltransferases, with some regional structural differences. The monomeric structure of CaPTB consists of two distinct domains, the N- and C-terminal domains. The active site cleft was formed at the interface between the two domains. Interestingly, the crystal structure of CaPTB contained eight molecules per asymmetric unit, forming an octamer, and the size-exclusion chromatography experiment also suggested that the enzyme exists as an octamer in solution. The structural analysis of CaPTB identifies the substrate binding mode of the enzyme and comparisons with other acyltransferase structures lead us to speculate that the enzyme undergoes a conformational change upon binding of its substrate.

• 복식문화연구
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• 제29권1호
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• pp.65-86
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• 2021

This study aims to develop a hanbok design method in response to recent changes in consumption trends that emphasize new aesthetic and cultural values, which contrast with the existing cultural order and repetitive normative styles in fashion designing. With this in mind, our study explores the main features of deconstruction fashion design as a theoretical guide for developing a methodology for deconstruction hanbok design, on the basis of which new, experimental and creative hanbok design works can be produced. To do this, we first investigate current trends in hanbok design and changing concepts of Korean fashion design through literature review of previous studies. Secondly, we explore deconstructionism and analyze its features to lay down the foundation for a post-modern approach in hanbok design. As the result of analysis, the main features of deconstruction fashion design are summarized as the following: 1) non-finishing, 2) decomposing and recomposing, 3) recycling, 4) transparent, 5) grunge, 6) flattening, and 7) exaggeration. Based on the identified core features of deconstruction fashion design, we develop a creative method of hanbok design in the context of modern Korean fashion design. Finally, we show five design outputs via a 3D digital fashion design process using the CLO3D software program.

• 창의정보문화연구
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• 제7권2호
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• pp.69-77
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• 2021

과거 프로그래밍은 컴퓨팅 관련 전공자들을 대상으로 일부의 학생들이 배우는 과목이었으나, 오늘날 소프트웨어 중심 산업이 도래함에 따라 컴퓨팅사고 교육과 함께 컴퓨팅 문제 해결의 도구로서 모든 전공 분야의 학생들에게 교육이 이루어지고 있다. 그러나 컴퓨팅 입문 과목을 필수로 이수해야 하는 학습자들은 익숙하지 않은 컴퓨팅 문제 해결 방식과 프로그래밍 언어라는 새로운 내용에 학습에 큰 어려움을 겪으며 학습 효과, 자신감, 흥미 저하와 같은 부정적인 현상으로 이어질 수 있다. 본 논문에서는 비전공자들이 프로그래밍 언어 과목을 학습하면서 겪는 어려움의 원인을 설문 조사, 일지 및 성취도를 질적 및 양적 연구로 분석하여 파악하고, 이를 최소화할 수 있도록 방안을 제시하여 향후 어려움을 최소화하는 교육 방안의 설계에 도움이 되고자 한다.

• 방송공학회논문지
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• 제27권5호
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• pp.676-684
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• 2022

본 논문에서는 메타버스 융복합 공간의 재창조를 통해 다양하게 확장될 수 있는 메타버스 공간의 잠재적 가능성에 대해 고찰하였다. 특히, 메타버스 공간의 새로운 개념 정립, 기술과 인문 융합의 학제 간 연구 모델 및 전략 수립을 제시하고자 하였다. 이를 위해 메타버스 공간의 특징 분석을 통해 현재 간과하고 있는 문제점을 드러내고 전문가 심층 인터뷰를 통해 이를 극복 할 수 있는 방안을 제시하였다. 이와 같은 학제 간 연구는 중장기적으로 메타버스 융복합 콘텐츠 산업의 활성화에 기여할 수 있을 것이다. 따라서, 이번 연구를 계기로 이푸 투안의 개념을 통해 재해석한 메타버스 공간이 의미 있는 삶의 장소이자 창조공간으로서의 실질적인 구현에 이를 수 있기를 기대한다.

• 창의정보문화연구
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• 제5권1호
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• pp.15-24
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• 2019

가상현실 기반 교육 콘텐츠를 초·중학생이 수행하기 위해서는 가상현실과 학생이 상호작용하는 도구와 방법이 필수적이다. 하지만, 기존에 개발된 컨트롤러는 성인 대상의 범용적인 형태로 개발되고 있어 교육의 목적과 초·중학생의 수준을 고려한 상호작용 도구에 관한 연구가 필요하다. 따라서, 본 연구는 초·중학생을 위한 가상현실 상호작용 도구를 개발하기 위해 현재 범용적으로 활용되고 있는 도구에 대한 학교급과 성별에 따른 학생의 인식을 용이성, 유용성, 이용태도, 사용의도를 분석하였다. 분석결과, 인식이 사전에 비해 사후에 높아진 것으로 나타나 범용적인 도구의 교육적인 활용이 충분히 가능한 것으로 분석되었다. 학생 인터뷰를 통해 가상현실에서 초·중학생의 상호작용성을 고려한 도구 개발 방향에 대한 시사점을 도출하였다.

• ETRI Journal
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• 제44권1호
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• pp.85-93
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• 2022

We propose an efficient method for synthesizing mesh-based realistic computer-generated hologram (CGH). In a previous nonanalytic mesh-based CGH synthesis, the angular spectrum of the two-dimensional (2D) plane is calculated using the fast Fourier transform (FFT) with the same size as the resolution of the final hologram. Because FFT increases the computation time as the size of the input matrix increases, the previous method has a problem: The higher the resolution of the hologram, the greater the computational load, thereby delaying synthesis time. In this study, when calculating the angular spectrum of the 2D plane in mesh-based CGH synthesis, we propose a method to calculate the angular spectrum by defining the 2D plane with an arbitrary size smaller than the resolution of the final hologram. The resolution adjustment method reduces the computation time and can be applied to occlusion culling and texturing for the realistic effect of mesh-based CGH. We describe the principle, error analysis, application of realistic effect, and experimental results of the proposed method.