• 한국실내디자인학회논문집
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• 제19권6호
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• pp.112-120
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• 2010

Human can recognize the environment by detecting spatial perception, and most of environmental perception depends on visual perception. In view that the acquisition of spatial information is accomplished through visual recognition, analysis of visual structure contained in the space is thought to be very important sector in studying the characteristic of the space. The history of studies on visual structure of space, however, wasn't too long, and furthermore most of the theories up to now focused on static and planar principles. Under this circumstance, this study is intended to suggest new theory by combining Isovist theory and VGA theory that have been actively discussed as the theory on visual perception-based spatial structure and supplementing them between each other to expand into 3-dimensional model. The suggested theory is a complex principle in dimensional and dynamic form in consideration of visual direction, which forms 3-dimentional virtual model that enables visualization of the property of spatial structure as the routine discriminating whether visual connection is made between viewing point and target point, and the target point is included in the visual field quadrangular pyramid or not. Such model was built up by an analysis application where four probe paths were applied to simulate the visual structure that occurs in virtual space, and then the characteristics were analyzed through quantification. In result, in spite of the path with equal space and equal length, significant difference in the acquired quantity of spatial information could be found depending on the probe sequence. On the contrary, it was found that probe direction may not affect the acquired quantity of information and visual property of the space.

• 한국정보통신학회논문지
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• 제13권2호
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• pp.419-424
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• 2009

3D-GIS 구현을 위하여 복잡한 지형을 신속하게 결정하는 항공LiDAR 자료를 기반으로 가상현실 공간자료를 구축하여 활용가능성에 대한 연구이다. 연구를 위해 대상지역의 항공LiDAR자료, 수치지도, 항공사진 그리고 기본설계도를 수집하였다. 연구결과 3차원 GIS구축을 위해 LiDAR자료를 이용함으로써 활용도를 높일 수 있다. 향후 유비쿼터스 환경에서 지형정보를 손쉽게 파악 할 수 있는 공간정보의 제공으로 건설이나 GIS 관련분야에서 많은 도움이 될 것이다.

• 디지털산업정보학회논문지
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• 제11권1호
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• pp.1-8
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• 2015

Recently, a high strength concrete(HSC) in excess of 80 MPa is popular to use in the domestic construction field. But there is no design standard of high strength concrete. It is reason why a study about structural behaviors of thin walls is required. In this paper, the accurate Finite Element Method as a virtual test is suggested considering material properties, which are concrete and steel, and the experimental fractural model suggested by Kupfer. It is conducted the comparison evaluation of the ultimate failure loads, lateral-displacements and crack propagation patterns between the results of experimental approach, which were carried on Saheb's test for normal strength concrete and Lee's test for high strength concrete. Therefore it is suggested to use the accurate virtual simulation test method and Ubiquitous Sensor Network(USN) by Finite Element Method for Internet of Things(IoT).

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2022년도 추계학술대회
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• pp.386-388
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• 2022

최근 VR(virtual reality)과 AR(augmented reality)을 이용한 실감형 콘텐츠가 학습 보조 교구로써 주목을 받고 있다. 3D 기반의 콘텐츠는 평면에서 보여지는 2D 기반 콘텐츠보다 다양한 각도에서 대상을 관찰하고 체험이 가능하다는 장점이 있다. 본 논문에서는 가상환경에서의 아두이노 학습을 위한 3D 모델 기반의 콘텐츠 설계를 제안한다. 블렌더를 이용하여 아두이노 보드와 센서를 구현하고 유니티 엔진을 이용하여 3D 기반의 시뮬레이터 환경을 구성하였다. 제안하는 콘텐츠는 3D로 구현된 아두이노 보드와 센서를 이용하여 학습자들이 쉽게 아두이노의 동작원리와 코딩 과정을 체험해 볼 수 있다.

• 한국결정성장학회지
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• 제30권5호
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• pp.208-213
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• 2020

본 연구에서는 유한요소 해석과 PQRSM 알고리즘 기반의 최적설계 기법을 활용하여 IGZO 산화물 타겟과 구리백플레이트가 서로 접합되어 있는 타겟 모듈에서 IGZO 산화물의 열변형을 최소화할 수 있는 방법에 대해 고찰했다. 3차원 유한요소 해석 결과 고온에서 IGZO와 구리 백플레이트의 접합 이후 냉각될 때 IGZO 산화물의 열변형은 최대 0.161 mm로 예측되었다. 유한요소 해석을 연동한 최적설계기법을 적용하기 위해 타겟 모듈을 냉각할 때 사용하는 하부받침대와 상부고정대의 위치를 설계변수화하여 목적함수인 IGZO의 열변형이 최소화되도록 최적설계를 수행했고, 그 결과 IGZO 산화물의 열변형을 최대 42 % 감소시킬 수 있었다. 이는 타겟을 구성하는 주재료와 구조 변경 없이 공정 중에 사용되는 부재료의 위치 변경만으로도 산화물의 열변형을 감소시킬 수 있어 산업계에 유용할 것으로 사료된다.

• 한국정보전자통신기술학회논문지
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• 제4권1호
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• pp.68-75
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• 2011

최근 주변 장치의 성능은 사용자들이 요구하는 멀티미디어 데이터를 충족하기 위해 급속히 증가하고 있으며 고성능 장치에 실시간으로 데이터를 제공하기 위해 주변 장치의 인터페이스는 넓은 대역폭과 높은 전송속도가 필요하게 되었다. PCI Express는 고속의 직렬 전송 인터페이스로 이전의 PCI와 PCI-X와 상호 호환이 되는 인터페이스이다. 본 논문에서는 직렬 링크 방식의 주변 장치 통합 인터페이스 설계하였다. TC/VC 매핑 기법과 VC 중재 기법을 사용해 우선순위에 의한 패킷 전송이 가능하도록 하였고, 4개의 레인을 사용하여 패킷을 전송하도록 하였다. Verilog HDL을 사용하여 인터페이스를 설계하였고 이를 Modelsim으로 검증하였다. FPGA 검증은 Xilinx ISE와 SPARTAN XC3S400을 사용하였으며 합성은 Synopsys Design Compiler를 사용하여 검증하였다.

• 대한기계학회논문집A
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• 제31권6호
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• pp.635-643
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• 2007

As many engineers and technicians are involved in the design process of large scale and/or complex products, there are a lot of miss matches and interferences due to designers' faults and several kinds of CAD systems. Recently, CAD systems are applied to verify and check the assembly process. Digital Mock-Up(DMU) system, a tool to build a virtual mock-up in the design stage, has been used to prevent the interferences and miss matches during precision design processes. Using the virtual assembly tool, engineers are able to design precision and interference free parts without physical mock-ups. Instead of a single CAD source, several CAD systems are used to design a complex product. Several organizations are involved in the distributed design environment for heterogeneous multi-CAD assembly. XML and the lightweight CAD file are proposed for the multi-CAD assembly. XML data contains hierarchy of the heterogenenous multi-CAD assembly. STEP PDM schema and STEP ISO 10303-28 formations are applied to construct the XML data. The lightweight CAD file produced from various CAD files through ACIS kernel and InterOp not only contains mesn, B-Rep and topological data, but also is used to visualize CAD data and to verify dimensions. Developed system is executed on the desktop computers. It does not require commercial CAD systems to visualize 3D assembly data. Real-time interference and fitness checks, dimensional verification, and design and assembly verification are performed on the developed system. Assembly of heterogeneous models for a car is conducted to verify the effectiveness of the developed DMU system on the Internet.

• 한국수자원학회논문집
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• 제46권5호
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• pp.439-447
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• 2013

본 연구는 우리나라 전역에 대하여 제작된 Modified Bartlett-Lewis Rectangular Pulse (MBLRP) 강우생성 모형의 모수 지도의 적용성을 홍수 재현의 관점에서 평가하였다. MBLRP 모형을 통해 생성된 가상 강우시계열을 사용하여 산정된 확률강우량은 관측치를 사용하여 산정된 확률강우량 보다 약5%에서 40%정도 작았고, 확률강우량의 재현기간이 클수록 과소산정의 정도가 크게 나타났다. 가상의 도시 유역에 MBLRP 모형을 적용하여 산정한 확률홍수량은 관측치를 사용하여 산정한 확률홍수량 보다 약20%에서 45%정도 작게 나타났고, 확률홍수량의 재현기간이 클수록, 그리고 유역의 불투수성이 작을수록 과소산정의 정도가 크게 나타났다.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2004년도 학술발표회
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• pp.1285-1289
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• 2004

Elman Discrete Recurrent Neural Networks Model(EDRNNM) was used to be a suitable short-term hydrological forecasting tool yielding a very high degree of flood stage forecasting accuracy at Musung station of Wi-stream one of IHP representative basins in South Korea. A relative new approach method has recurrent feedback nodes and virtual small memory in the structure. EDRNNM was trained by using two algorithms, namely, LMBP and RBP The model parameters, optimal connection weights and biases, were estimated during training procedure. They were applied to evaluate model validation. Sensitivity analysis test was also performed to account for the uncertainty of input nodes information. The sensitivity analysis approach could suggest a reduction of one from five initially chosen input nodes. Because the uncertainty of input nodes information always result in uncertainty in model results, it can help to reduce the uncertainty of EDRNNM application and management in small catchment.

• 대한인간공학회지
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• 제33권3호
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• pp.175-189
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• 2014

Objective: The goal of this research is to develop new user behavior model using user motion analysis with microscopic perspective for attracting user's participation in interactive space. Background: The interactive space is 'human's place', which is made up of complex elements of digital virtual space and traditional analog and physical environment based on human-computer interaction system. Human behavior has changed in it at the same time. If the user couldn't make participation in interaction, the purpose of the system is not met, which reduces its effect. Therefore, we need to focus on interactive space that is potential future direction from a new point of view. Method: For this research, we would discuss and study fields of interactive space; (1) finding definition of interactive space and studying background of theory about it. (2) providing base of user behavior model with study of user's context that is to be user information and motion. (3) examining user motion, classify basic motion type and making user participation behavior model in phases. Results: Through this process, user's basic twenty motions which are systematized are taken as a standard for analysis of interaction process and participation in interactive space. Then, 'NK-$I^5$ (I Five)' model is developed for user participation types in interactive space. There are five phases of user participation behavior: Imperception, Interest, Involvement, Immersion, and Influence. In this analysis, three indicators which are time, motion types, and user relationship are found to be related to participation. Conclusion: The capabilities and limitation of this research is discussed to attract user participation. This paper focuses especially on contribution of design to lead user's participation in interactive system and expectation to help adapt to user centered design of various interactive space with new aspect of user behavior research. Application: The results of the 'NK-$I^5$ (I Five)' model might help to realize successful interactive space based on user centered design.