• 한국실내디자인학회논문집
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• 제20권6호
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• pp.145-152
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• 2011

Salvador Dali put a title of his work as 'A Propos of the Treatise on Cubic Form by Juan de Herrera' at 1960. Through this work which is consisted in cube frame surrounding black and white letter squares and nails in the sky, he directly referred about the cube which were showed in his pictures. To understand the meaning of this work, Dali's paintings and Juan de Herrera's design and architectural ideas are analysed by building. His concerning about absolute existence like god and nuclear takes the cubic form by Juan de Herrera instead of pictorial tendencies of Cubism, however pictorial elements such as sky and nails were still used in the work. He use alphabet letter as pattern consisting wall and symbol representing 'Juan de Herrera', moreover number '2' is taken to show up line attribute. Dali had several design develop process, and finally he reached an new stage called 'Hypercube'. Hypercube can distinguish from Cubism and Herrera's architectural idea, and it will be free from objective world based in Euclid geometry. Although cubic is the simplest shape. It can contain the variety of developments in these fields - philosophy, architecture, painting and etc.- from Platon to nuclear physics and coexists in a picture of Salvador Dali.

• 한국광학회지
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• 제23권4호
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• pp.147-153
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• 2012

고정 화소수의 표시소자를 기반으로 하는 무안경 방식 다시점 3D 디스플레이는 시점수 증가에 따른 입체영상 저해상도 문제를 안고 있다. 이를 해결하기 위하여, 본 논문은 프로젝션 기반의 무안경식 다시점 3D 디스플레이 시스템에서 구면 형태의 상용 렌티큐라 렌즈시트를 사용하여 단위화소의 폭을 집속하고 광원수 증가에 따른 유효 해상도를 증가시켜 저해상도의 문제를 해결하는 광학적 접근 방법을 제시하였다. 제시된 방법은 주어진 시스템환경에서 도출 가능한 주요 파라메터의 정의 및 이론적, 실험적 결과를 통하여 축소 가능한 단위화소폭 및 확장 가능한 유효 해상도를 도출하는 수순으로 수행되었다. 결과적으로 1.016 mm의 단위화소폭을 기준으로 25 LPI의 렌티큐라 렌즈 시트를 투과하였을 경우, 축소된 폭(Beam waist)은 0.19 mm, 확장 가능한 유효 해상도는 최대 5배를 나타내었다. 이와 더불어, 초점심도(Depth of focus)는 1.496 mm로서 상용 렌티큐라 렌즈 시트의 두께 허용치 및 광학계 정렬 허용범위를 충분히 확보하였다.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2005년도 춘계종합학술대회
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• pp.816-819
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• 2005

본 논문에서는 카타디옵트릭 카메라를 사용할 때 발생하는 공간 왜곡 문제를 해결하기 위해 3차원 포물면 좌표 변환 함수와 신경회로망을 이용한 좌표 변환 및 보정 기법을 제안한다. 본 연구에서 사용하는 포물면 거울을 이용한 카타디옵트릭 카메라는 360$^{\circ}$의 전 방향 영상을 얻을 수 있으나, 렌즈의 외형에 의해 영상이 왜곡되어 나타나는 특징을 가지고 있다. 따라서 3차원 공간상에서 왜곡 영상에서의 좌표를 실제 거리 좌표로 변환하기 위해 포물면 거울 초점과 이미지 상의 좌표를 포물면 거울 위로 투영시킨 좌표를 이용한 좌표 변환 함수를 사용한다. 이 과정에서 발생하는 오차를 BP(Back propagation) 신경망 알고리즘으로 수정한다.

• Smart Structures and Systems
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• 제31권2호
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• pp.101-111
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• 2023

Structural health monitoring (SHM) covers a range of damage detection strategies for buildings. In real-time, SHM provides a basis for rapid decision making to optimise the speed and economic efficiency of post-event response. Previous work introduced an SHM method based on identifying structural nonlinear hysteretic parameters and their evolution from structural force-deformation hysteresis loops in real-time. This research extends and generalises this method to investigate the impact of a wide range of flag-shaped or pinching shape nonlinear hysteretic response and its impact on the SHM accuracy. A particular focus is plastic stiffness (K_p), where accurate identification of this parameter enables accurate identification of net and total plastic deformation and plastic energy dissipated, all of which are directly related to damage and infrequently assessed in SHM. A sensitivity study using a realistic seismic case study with known ground truth values investigates the impact of hysteresis loop shape, as well as added noise, on SHM accuracy using a suite of 20 ground motions from the PEER database. Monte Carlo analysis over 22,000 simulations with different hysteresis loops and added noise resulted in absolute percentage identification error (median, (IQR)) in K_p of 1.88% (0.79, 4.94)%. Errors were larger where five events (Earthquakes #1, 6, 9, 14) have very large errors over 100% for resulted K_p as an almost entirely linear response yielded only negligible plastic response, increasing identification error. The sensitivity analysis shows accuracy is reduces to within 3% when plastic drift is induced. This method shows clear potential to provide accurate, real-time metrics of non-linear stiffness and deformation to assist rapid damage assessment and decision making, utilising algorithms significantly simpler than previous non-linear structural model-based parameter identification SHM methods.

• 한국의류학회지
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• 제44권4호
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• pp.657-675
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• 2020

This study suggests a direction for design development through an analysis of the experiential rental Hanbok design in Jeonju Hanok Village. As a research method, 268 outfit photographs of tourists wearing experiential rental Hanbok for women were collected as design analysis data from Jeonju Hanok Village. Frequency analysis was then performed by dividing into form, color, material·pattern, and detail. The controversy over the design of experiential rental Hanbok revolves around how and how much tradition is reflected. This is a very important part of the design analysis and development direction. If necessary, traditionality was discussed using the Hanbok style of the Joseon Dynasty as a standard. Development directions derived from the analysis are summarized as follows. First, avoid the distorted shape of skirts. Second, develop underwear for traditional silhouettes. Third, expand traditional colorations and avoid the excessive use of accent colors. Fourth, it is necessary to develop rental Hanbok materials with decorative features. Fifth, there is a need to design flat pattern construction for rental Hanbok that reflects a standardized production method and a changed aesthetics.

• 지식경영연구
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• 제18권2호
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• pp.85-102
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• 2017

With rapid development of information and communication technologies, open collaboration can be eased through the Internet. Open source software, as a representative area of open collaboration, is developed and adopted to various fields. In this research, based on organizational learning theory, we examine the impacts of exploration and exploitation on innovation performance in open source software development projects. We define knowledge exploration as a number of developers from outside organization and knowledge exploitation as the ratio of member of an organization who participated in an open source software project managed by the organization. For analysis, we collect data of 4794 projects from github which is a representative open source software development platform using Web crawler developed by Python. As a result, we find that excessive exploration has curvilinear (invers U-shape) relationship on project performance. On the other hand, exploitation with enough external developers will positively impact on project performance.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2007년도 춘계학술대회논문집
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• pp.696-700
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• 2007

In case of dome-typed gymnastics training floor, since its form takes shape of the focus of sound, in the occasion when the finishing-material was used with the sandwich panel that prominent in reflexibility, and because the reverberation of sound in indoor is too loud, a smooth practice and teaching is very difficult. As this indoor gymnastics training floor, standing at its character, is required simultaneously the idea communication between the player and the coach, and the acoustic capability regarding to the clearness of music, besides the sport activity, the method to minimize the acoustic defect should be urgently contrived from the stages of design and beginning of construction. On this viewpoint, after investigation on the confidence of the surveyed value and the estimated value using acoustic simulation, and use of the changed finish-material, this thesis intends to design the dome-typed gymnastics training floor that secured the optimized acoustic condition. It is also considered that such result of the study could be utilized as the useful data that enables to improve the retrenchment effect of the construction cost as well as the acoustic performance, by means of the prediction control on the acoustic problem from the stage of design, for the occasion when the similar indoor sport gymnasium is planning to build for the near future.

• 한국디지털건축인테리어학회논문집
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• 제13권4호
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• pp.77-86
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• 2013

Uigwe is official reports of the Joseon dynasty. They published from early Joseon but remain from 17C. We can search many hidden informations in them. Ga-Jungjagak (temporary T-shaped house) is one of them. It is unique architecture of the Joseon dynasty but it doesn't exist now at all. We can see many drawings describing Ga-Jungjagak (temporary T-shaped house) located next to Jungjagak in Uigwe. Jungjagak (T-shaped house) was built in royal tombs for sacrifice. Ga-Jungjagak was built in royal tombs for sacrifice as Jungjagak but existed temporarily. In this study, I want to find the process of norms Ga-Jungjagak in old records, official reports and annals of the Joseon Dynasty. Results are as follows: Ga-Jungjagak is the sacrifice space for queens in royal tombs. It is need to avoid sacrifice of delight and sorrow at the same time. They sacrifice to represent sorrow after the death of kings and queens for three years. After three year, they sacrifice to represent delight for kings and queens became ancestral gods. Ga-Jungjagak was destroyed three years later to combined sacrifices. The shape of Ga-Jungjagak is similar to Jungjagak in the same tomb. But dimensions of Ga-Jungjagak are equal or smaller than Jungjagak and decorations are abstemious.

• Journal of Welding and Joining
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• 제11권1호
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• pp.52-61
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• 1993

Laser welding of ASTM no. 1060 Al plate with a pulsed Nd: YAG laser of 200W average power was performed for end capping of KMRR nuclear fuel elements In this research, we performed basic welding experiments. Firstly, laser output parameters which affect laser welding parameters were studied by changing laser input parameters for effective welding of 1060 Al plates. We found that laser power density and pulse energy are important parameters for smooth bead shape. Secondly, welding parameters which affect weld width-to-depth ratio were studied by changing power density and pulse energy, shielding gas, and defocusing. We found that power density must be higher than 0.3 Mw/cm$^{2}$ pulse energy must be higer than 3 J. travel speed must not exceed 200mm/sec, laser focus must be existed beneath 2-3mm from plate surface and helium is proper shielding gas. Thirdly, we studied the weld defects of Al-1060 such as crack and porosity in lap-joint welding. We designed new welding geometry for crack free welding of Al-1060 plates, and obtained crack free weldment but with lack of fusion. However, with Ti, Zr grain refiner elements, we can weld Al plates without solidification hot crack. Finally, we studied the origin of porosity by changing shielding gas. And we found that porosity was resulted from entrapment of shielding gas by the collapsing keyhole.

• 패션비즈니스
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• 제19권4호
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• pp.109-119
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• 2015

A wide variety of fashion materials focus on good drape property and softness. Among the recently emerging materials, Neoprene that consists of laminated knit on both sides of foamed neoprene sheet seeks a unique appearance that is considerably deviated from the current flow. Diverse processing methods for the newly released material heighten the value in function and beauty among trends of fashion materials by enhancing the appearance, touch and material property. Laser-cutting technique is one of the processing methods that is consistently used in the textile area. This study aimed to find the basic materials for applicability of laser-cutting technique to clothing goods after consideration of the changes in material property and drape shape, and to furthermore enforce different pattern conditions to Neoprene material, one of the newly attractive materials in the fashion area. In this study, we applied laser-cutting technique to Neoprene material sample under different conditions of pattern appearance, size and distance, based on current evaluation and theoretical background of Neoprene material, fashion trend and laser-cutting technique. Drape property can improve and the drape direction could also be controlled by a wide variety of laser-cutting techniques applied to Neoprene materials that have uniquely different appearances from most other textiles. This technique could be applied to the design for diversification of Neoprene clothing goods in the future.