• 한국HCI학회:학술대회논문집
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• 2006.02a
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• pp.1283-1288
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• 2006

실감모델링(Immersive modeling)이란 모델링하는 사람이 물체의 특성을 고려하여 오감을 활용하여 모델링하는 것을 의미한다. 실감모델링을 위한 오감 중에서 시각은 모델링하는 사람에게 가장 영향을 많이 주기 때문에 실제와 같은 색상과 형상을 생성하는 것이 중요하다. 그러나 가상현실을 위한 데이터를 실시간으로 다루기 위해 많은 데이터를 사용할 수 없고 처리 과정이 단순해야 하기 때문에 시각데이터를 획득하는 과정에도 이를 고려해야 한다. 그 중에서 반짝이는 특성을 가진 물체의 색을 정확히 표현하기 위한 방법으로 색상선(color line)을 사용한다. 색상선은 반짝이는 특성의 표면의 색을 이색성반사 모델(dichromatic reflection model)로 간주하면 색 특성을 표현하는 선이 생성되게 된다. 본 연구는 반짝이는 물체로부터 색상선을 추출하기 위한 방법으로 노출 시간이 다른 여러 장의 이미지로부터 색상을 추출하는 방법을 제안한다. 노출 시간이 다른 이미지를 사용함으로써 한 장에 의해 분류하기 어려운 색상도 분류 가능하고 하이라이트가 발생하여 색상이 왜곡된 경우도 본래 색이 어떤 색상인지 추정되기 때문에 정확한 색상 추출이 된다. 본 연구에서는 3차원 측정 장비를 이용하여 3차원 형상과 색상이 동시 추출된 모델을 이용하여 렌더링된 결과와 제안된 방법으로 추출된 색상을 적용하여 렌더링된 결과를 비교할 것이다.

• Proceedings of the IEEK Conference
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• 2006.06a
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• pp.685-686
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• 2006

Recently, various AR-based product design methodologies have been introduced. In this paper, we propose technologies for enhancing robust augmentation and immersive realization of virtual objects. A robust augmentation technology is developed for various lighting conditions and a partial solution is proposed for the hand occlusion problem that occurs when the virtual objects overlay the user' hands. It provides more immersive or natural images to the users. Finally, vibratory haptic cues by page motors as well as button clicking force feedback by modulating pneumatic pressures are proposed while interacting with virtual widgets. Also our system reduces gabs between modeling spaces and user spaces. An immersive game-phone model is selected to demonstrate that the users can control the direction of the car in the racing game by tilting a tangible object with the proposed augmented haptic and robust non-occluded visual feedback. The proposed methodologies will be contributed to the immersive realization of the conventional AR system.

• 한국HCI학회:학술대회논문집
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• 2007.02a
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• pp.44-49
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• 2007

반짝이는 특성의 물체에 대해 이미지를 기반으로 색을 추출하는 경우 반짝이는 특성을 포함하면서 내재되어 있는 색 특성을 표현하기 위해 색 곡선(color line)을 이용한다. 이 경우 추출하려는 색이 왜곡되지 않은 가장 적합한 이미지를 선정하는 방법이 필요하다. 이를 위해서 실감모델링을 위해 색 곡선을 기반으로 색을 추출하는 방법을 제시하고 제시된 방법을 위해 색을 추출하기 가장 적합한 이미지를 선정하는 기준을 색포화율(color saturation ratio)을 통해 제안한다. 색포화율이란 색을 구성하는 요소 중에서 최소한 하나 이상의 색이 포화된 픽셀들을 최대 색거리를 가진 픽셀들로 간주하여 계산된 색거리의 총합에 대해 최소한 하나 이상의 색이 포화된 픽셀들의 색거리 총합의 비율를 의미한다. 이상적으로 이 비율이 최소가 되면 하이라이트를 제외한 어떤 픽셀도 포화되지 않기 때문에 반짝이는 특성을 가진 물체의 색을 추출하기 위해 촬영된 이미지는 하이라이트를 제외한 모든 색이 왜곡되지 않은 가장 적합한 이미지가 생성된다. 또한, 이렇게 선정된 이미지에서 추출된 색의 효율성을 보이기 위해 색 공간과 이미지 상에서 다양한 형태의 응용 결과를 제시하였다.

• International Journal of Internet, Broadcasting and Communication
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• v.16 no.3
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• pp.242-252
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• 2024

This study introduces a prototype for a virtual zoo initiative, aimed at optimizing resource utilization and minimizing animal displacement from their natural habitats. The prototype features a thoughtfully developed three-dimensional representation of an emperor penguin, with animations designed to emulate real-life behaviors. An investigation into file format distinctions for scientific research, encompassing Wavefront(OBJ), Collada(DAE), and Filmbox(FBX) formats, was conducted. The research utilized the Hololens 2 device for visualization, Unity for environment development, Blender for modeling, and C# for programming, with deployment facilitated through Visual Studio 2019 and the Mixed Reality Toolkit. Empirical examination revealed the OBJ format's suitability for simple geometric shapes, while DAE and FBX formats were preferred for intricate models and animations. DAE files offer detailed preservation of object structure and animations albeit with larger file sizes, whereas FBX files provide compactness but may face scalability constraints due to extensive data integration. This investigation underscores the potential of virtual zoos for conservation and education, advocating for further exploration and context-specific implementation.

• International journal of advanced smart convergence
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• v.10 no.3
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• pp.72-80
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• 2021

Metaverse is an immersive 3D virtual environment, a true virtual artificial community in which avatars act as the user's alter ego and interact with each other. If we do not manage the hype for the metaverse, which has recently been receiving a surge in interest, the metaverse will fail to cross the chasm. In this study, to provide stakeholders with insights for the successful introduction and growth of the 3D immersive next-generation virtual world, metaverse, we analyzed user-side interest, media-side interest, and research-side interest. For this purpose, in this study, search traffic, news frequency and topic, and research article frequency and topic were analyzed. The methodology and results of this study are expected to provide insight for the stable success of metaverse transformation and the coexistence of the real world and the virtual world through hyper-connection and hyper-convergence.

• Journal of Information Processing Systems
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• v.18 no.1
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• pp.130-145
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• 2022

Games are widely used in many fields, but not all games are successful. Then what makes games successful? The question gave us the motivation of this paper, which is to identify critical factors for successful games with topic modeling technique. It is supposed that game reviews written by experts sit on abundant insights and topics of how games succeed. To excavate these insights and topics, latent Dirichlet allocation, a topic modeling analysis technique, was used. This statistical approach provided words that implicate topics behind them. Fifty topics were inferred based on these words, and these topics were categorized by stimulation-response-desiregoal (SRDG) model, which makes a streamlined flow of how players engage in video games. This approach can provide game designers with critical factors for successful games. Furthermore, from this research result, we are going to develop a model for immersive game experiences to explain why some games are more addictive than others and how successful gamification works.

• 제어로봇시스템학회:학술대회논문집
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• 2003.10a
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• pp.882-885
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• 2003

In this paper, we describe a haptic jacket and wheel as a haptic interface to enhance VR game realism. Building upon the VR game system using this devices, our haptic interface technique allows the user to intuitive interact on game contents, and then to sense the game event properties such as walking, attacking, driving and fire in a natural way. In addition, we extended the initial haptic model to support haptic decoration and dynamic interactions due to the added game event in a real time display. An application example presented here is a VR Dino-Attack game. This game supports interactions among dynamic and our intuitive haptic interface. Modeling physic interactions involves precise collision detection, real-time force computation, and high control-loop bandwidth.

• Korean Journal of Computational Design and Engineering
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• v.22 no.2
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• pp.202-214
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• 2017

The augmented visualization of analysis results can play an import role as a post-processing tool for the modeling & simulation (M&S) technology. In particular, it is essential to develop such an M&S tool which can run on various multi-devices. This paper presents an augmented reality (AR) approach to visualizing and interacting with M&S post-processing results through mobile devices. The proposed approach imports M&S data, extracts analysis information, and converts the extracted information into the one used for AR-based visualization. Finally, the result can be displayed on the mobile device through an AR marker tracking and a shader-based realistic rendering. In particular, the proposed method can superimpose AR-based realistic scenes onto physical objects such as 3D printing-based physical prototypes in a seamless manner, which can provide more immersive visualization and natural interaction of M&S results than conventional VR or AR-based approaches. A user study has been performed to analyze the qualitative usability. Implementation results will also be given to show the advantage and effectiveness of the proposed approach.

• International conference on construction engineering and project management
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• 2022.06a
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• pp.1075-1084
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• 2022

The use of Hi-Tech in cultural heritage preservation and the promotion of cultural heritage values in general, particularly artifacts, opens new opportunities for attracting tourists while also posing a challenge due to the need to reward high-quality excursions to visitors historical and cultural values. Building Information Modeling (BIM) and Hi-Tech in new building management have been widely adopted in the construction industry; however, Historic Building Information Modeling (HBIM) is an exciting challenge in 3D modeling and building management. For those reasons, the Scan-to-HBIM approach involves generating an HBIM model for existing buildings from the point cloud data collected by Terrestrial 3D Laser Scanner integrated with Virtual Reality (VR), Augmented Reality (AR), contributes to spatial historic sites simulation for virtual experiences. Therefore, this study aims to (1) generate the application of Virtual Reality, Augmented Reality to Historic Building Information Modeling - based workflows in a case study which is a monument in the city; (2) evaluate the application of these technologies to improve awareness of visitors related to the promotion of historical values by surveying the experience before and after using this application. The findings shed light on the barriers that prevent users from utilizing technologies and problem-solving solutions. According to the survey results, after experiencing virtual tours through applications and video explanations, participant's perception of the case study improved. When combined with emerging Hi-Tech and immersive interactive games, the Historic Building Information Modeling helps increase information transmission to improve visitor awareness and promote heritage values.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.10 no.5
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• pp.223-227
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• 2010

Since the most of existing virtual model house used non-immersive type virtual reality technology, it was made to control using direct input type device such as keyboard and mouse. But in this paper realized not only direct data entry method but also indirect data entry method using eyetracking technology through universal webcam for virtual model house based upon modeling. In this paper showed the position of pointer controlled according to the relative movement of pupils or the part of function related to the equipment entry called by comparing the value of gray after extracting the area of pupil in the user' video data received from webcam. Such a method provided the convenience of navigation and interface to the user.