• 한국조경학회지
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• 제28권2호
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• pp.28-38
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• 2000

The aim of this study is evaluate artificial soils which are used alone or in a blend with field soil for the greening of artificial ground. To achieve these, determination of physicochemical properties was made in four artificial media[Perlite small grain(PSG), perlite large grain(PLG), crushed porous glass+bark(AS), crushed porous glass(CPG)] used alone and/or in a blend with field soil, then evaluation of their effect on th plant growth of Ligustrum obtusifolium and Syringa vulgaris were conducted. In bulk density of root media at field capacity and the saturated hydraulic conductivity, LG and AS showed good performance. But, PLG was though to be unsuitable as artificial soil when used alone because of poor plant growth. PLG, AS, and CPG were thought to be good when it is used in a blend with field soil. But, PSG was thought to be unsuitable. In the result, PSG is recommended as artificial soil which is used alone for greening of artificial ground. PLG is recommended as artificial soil which is used in a blend with field soil. AS is recommended as artificial soil which is used alone and in a blend with field soil. Thought CPG+field soil(v/v, 1:1) might be undesirable in consideration of the chemical properties in six months after planting, it was thought to be superior to th other treatments in the plant growth. CPG can be used as artificial soil which is used in a blend with field soil. Follow-up studies are being conducted to investigate their effects on the plant growth of the other plants and the practical use of them in artificial grounds.

• 한국정보과학회논문지:시스템및이론
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• 제33권4호
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• pp.216-222
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• 2006

벡터 필드는 공간상에 눈으로 보이지 않거나 표현하기 어려운 데이타의 진행을 이해 하기 쉽게 표현하는데 많이 사용되고 있다. 예를 들면, 바람이나 물의 진행 방향 및 세기, 온도의 전도, 전자기파 등의 과학적인 데이타의 시각화에 사용되고 있다. 본 연구에서는 3차원 모델상에 존재하는 벡터 필드에 대해 시각적인 정보와 더불어 촉각을 통한 직관적인 인식을 제공하기 위한 햅틱 렌더링 기술을 개발하였다. 이를 구현하기 위해 벡터 필드를 햅틱 인터페이스에 적합하게 모델링 하는 기법과 시뮬레이션 기술을 개발하였다. 이를 바탕으로 일상생활에 사용되는 지도에서 사용자가 원하는 목적지로 햅틱 인터페이스를 통해 안내해 주는 햅틱 맵과 해류의 흐름을 보여주는 시각적인 벡터 필드를 사용자가 촉각을 통해 직관적으로 느낄 수 있도록 해주는 시스템에 적용하였다. 앞으로 교육, 훈련, 그리고 오락 등 다양한 분야에서 이러한 햅틱 벡터 필드 기술이 사용될 수 있을 것으로 기대된다.

• 한국CDE학회논문집
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• 제19권4호
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• pp.347-355
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• 2014

IFC converters and viewers, applicable in the construction field, are being actively developed while, in the civil engineering field, IFC schemata are being developed. To prove the IFC schema grammatically, the existing ISO 10303 30s' pre-processors and post-processors may be used. However, to visually prove the IFC model, the existing commercial 3D modeling software should be converted into the IFC schema of civil engineering field, and a viewer is needed to view it. Thus, this study developed a IFC converter and viewer prototype system to apply BIM in the road field. To express the road line, LandXML was analyzed, and IFC suitable for expressing shapes in the road field was designed. Also, an IFC suitable for bridges with focus on representative bridge structures such as abuts, piers and decks was designed. Further, a converter was developed using AutoCAD's Civil3D and Revit's 3rdp party tools, and software was also developed designed to combine each converted IFC model into one IFC. In addition, a viewer designed to view IFC in the road field was developed to prove the converted IFC. Eight major verification and examination items were selected and used in testing the converted model, and it was confirmed that the viewer normally viewed the IFC schema in the road field. The proposed IFC converter is expected to be used as a visual IFC verification tool in the road field.

• 천문학회보
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• 제39권1호
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• pp.72.1-72.1
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• 2014

In this study, we extrapolate a nonlinear force-free field (NLFFF) from an observed photospheric magnetic field to understand the three-dimensional (3D) coronal magnetic field producing a huge solar flare. The purpose of this study is to develop a NLFFF extrapolation code based on the so-called MHD relaxation method and check how accurately our model reconstructs a coronal field. Furthermore, we apply it to the photospheric magnetic field obtained by Helioseismic and Magnetic Imager (HMI) on board Solar Dynamics Observatory (SDO) to reconstruct a 3D magnetic structure. We first investigate factors in controlling the accuracy of our NLFFF code by using a semi-analytical solution obtained by Low & Lou (1990). To extend a work done by Inoue et al. (2014), we apply various boundary conditions at the side and top boundaries in order to make our solution close to a realistic solution. As a consequence, our solution has a good accuracy when three components of a reference field are all fixed at the boundaries. Furthermore, it is also found that our solution is well matched to the Low & Lou solution in the central area of a simulation domain when the three components of a potential field are fixed at side and top boundaries (this approach is close to a realistic solution). Finally, we present the 3D coronal magnetic field producing an X 1.5-class flare in the active region 11166 through the extrapolation from SDO/HMI.

• 방송공학회논문지
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• 제24권5호
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• pp.755-764
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• 2019

현재 사용 가능한 상용 라이트필드 카메라는 정지 영상만을 취득하거나 가격이 매우 높은 단점으로 인하여 5차원 라이트필드 비디오 취득에 어려움이 있다. 이러한 문제점을 해결하기 위해 본 논문에서는 단안 비디오로부터 라이트필드 비디오를 합성하기 위한 딥러닝 기반 기법을 제안한다. 라이트필드 비디오 학습 데이터를 취득하기 어려운 문제를 해결하기 위하여 UnrealCV를 활용하여 3차원 그래픽 장면의 사실적 렌더링에 의한 합성 라이트필드 데이터를 취득하고 이를 학습에 사용한다. 제안하는 딥러닝 프레임워크는 입력 단안 비디오에서 $9{\times}9$의 각 SAI(sub-aperture image)를 갖는 라이트필드 비디오를 합성한다. 제안하는 네트워크는 밝기 영상으로 변환된 입력 영상으로부터 appearance flow를 추정하는 네트워크, appearance flow로부터 얻어진 인접한 라이트필드 비디오 프레임간의 optical flow를 추정하는 네트워크로 구성되어 있다.

• 품질경영학회지
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• 제49권3호
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• pp.405-420
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• 2021

Purpose: This study started with the question of how to use Virtual Reality (VR) contents as a part of the non-face-to-face education tool that has recently attracted attention. Methods: In this paper, the use of VR contents as an educational tool is explained as a process of 'new media access dimension'. The question was explored on why Virtual Reality (or Augmented Reality) contents are not used as educational tools in the educational field. Results: As a result, the lack of 'material access' such as devices and infrastructure affects 'motivational access' approach stage, which is the previous stage. Again, it has a negative effect on literacy, which is 'skill access' approach stage. As it was found that it was not circulating to the level of "motive-material-skill-usage", it was discussed that it was taking a different step from the past adoption process of ICT and smart media. Conclusion: Based on this, it is believed that immersive content will contribute to arousing interest that can be applied and spread in the educational field, and it is also thought that it will be possible to derive academic interest in the educational effect according to the characteristics of immersive content such as VR.

• 한국측량학회:학술대회논문집
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• 한국측량학회 2007년도 춘계학술발표회 논문집
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• pp.73-76
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• 2007

The Global Positioning System(GPS)is an advanced navigation satellite system for determination to position. It can provide three-dimensional positioning, in dependent of weater, 24 hours per day. This paper described the Field DGPS program Using PDA can help a field work and compute the TM rectangular coordinates, compared the output of the Field DGPS program with the results of surveying using EDM(electronic distance measurement).

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2006년도 6th International Meeting on Information Display
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• pp.834-837
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• 2006

We observed the destruction of the liquid crystal alignment with the repeating scan of strong DC electric field. The strong electric field seems to force the alignment to be scarred permanently and it accumulated with the repetition. In this report we connected alignment destruction behavior and electric field strength to obtain information on the alignment strength. And we compared the behavior between different alignment techniques.

• 천문학회지
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• 제17권2호
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• pp.115-125
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• 1984

Effect of magnetic field on the thermal instability is studied in the radiatively cooling region behind an interstellar shock of moderate propagation velocity (${\sim}10\;km/sec$). It is shown that the presence of interstellar magnetic field of a few micro gauss is very effective in preventing the thermal instability from building-up density concentration. In the absence of magnetic field, the shock-induced thermal instability amplifies preshock density inhomogeneity by more than an order of magnitude. However, in the presence of magnetic field, the amplified density contrast is shown to be only a factor 2.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2008년도 춘계학술대회 논문집
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• pp.148-150
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• 2008

In this paper, we report the improved driving methode using planar-gate for field emission light source. Due to the cold cathode in field emission device, it has advantage for driving system in terms of high speed pulse driving with narrow duty ratio. This paper shows that our driving method offers the stable and reliable driving system without rapid electric field variation for field emission light source.