Publication List

International Journal

  • Information fusion of heterogeneous sensors for enriched personal healthcare activity logging
    Daeil Seo, Byounghyun Yoo*, and Heedong Ko, International Journal of Ad Hoc and Ubiquitous Computing, In press
    (*Corresponding author) 

    AbstractDespite the proliferation of wearable devices and mobile apps for healthcare activity monitoring, no model that complementarily integrates these monitoring logs making up personal big data has been put forth. In addition, such datasets are too large to yield meaningful information. To deal with data from heterogeneous sources, a common format and information fusion model for the complementary aggregation and abstraction of logs are necessary. We introduce a sensor and activity model that classifies heterogeneous sensors and propose an information fusion method that reorganizes personal healthcare activity logs and visualizes them hierarchically in a harmonized way while providing a meaningful summary. 

    Keywords: healthcare, information fusion, activity model, sensor model

    DOI:

    CoverageScience Citation Index Expanded

    ISSN: 1743-8225

    RightsLink
    Posted Jan 19, 2016, 5:48 AM by Byounghyun Yoo
  • Prosumption perspectives on additive manufacturing: making consumer products reconfigurable with 3D printing
    Byounghyun Yoo, Heedong Ko, and Sungkuk Chun, Rapid Prototyping Journal, 22(4):691-705 

    Abstract
    Purpose – This paper examines the changing backdrop of the consumer market in relation to 3D printing, especially in the context of Web infrastructure that connects consumers and producers with unprecedented diversity and scale, and Web 2.0 user created content in the material domain.
    Design/methodology/approach – The paper presents a conceptual architecture and software platform that facilitate do-it-yourself reconfiguration of existing products incorporating 3D printing, mobile 3D sensor, augmented reality (AR), and Web technologies.
    Findings – This work shows that prosumer reconfiguration of consumer products is the major paradigm in the era of democratized production. The results suggest that this approach may be used in the consumer market to meet consumer preferences for adopting innovations without redundant consumption.
    Research limitations/implications – Verification of the proposed conceptual approach is limited to the use of household consumer products. A critical mass of participants and product information are both necessary to achieve a sustainable ecosystem from the proposed platform. Intellectual property issues rely on the fair use of end-user production.
    Social implications – The proposed approach allows users to swap out consumer product parts or upgrade individual modules as innovations emerge, extending the lifecycles of consumer products and potentially reducing consumer waste.
    Originality/value – There is a lack of work on facilitating the proliferation of practical 3D printing through prosumption in relation to existing consumer products. This paper’s scientific contribution involves how 3D printing affords social manufacturing and consumer-oriented presumption in conjunction with mobile 3D sensor, AR, and Web technologies. 

    Keywords3D printing, Democratizing production, Social manufacturing, Prosumption, Reconfiguration, Green consumption, Do-it-yourself


    CoverageScience Citation Index Expanded, Scopus

    ISSN: 1355-2546

    See Full Text: ResearchGate

    RightsLink
    Posted Jun 28, 2016, 9:40 PM by Byounghyun Yoo
  • Responsive geo-referenced content visualization based on a user interest model and levels of detail
    Daeil Seo, Byounghyun Yoo*, and Heedong Ko, International Journal of Geographical Information Science, 29(8), pp.1441-1469, August 2015.
    (*Corresponding author) 

    Abstract: With steady growth in the deployment of sensor networks and widespread usage of mobile devices, the production of geo-referenced data is increasing exponentially, while analysis of the data typically uses a variety of application services on the Internet for activities such as logging and driving. This geo-referenced content needs to be classified and organized according to user interest for location-based decision-making. In this study, we define a user interest model and propose a method for organizing and presenting content based on the model. Our approach reconstructs geo-referenced content from a variety of sources based on points of interest organized by the user interest model. We present typical cases of using the proposed method, including a theme park resort, personal weather stations, and travel planning to show how the proposed method facilitates user decision-making based on the geo-referenced content. 

    Keywords: geo-referenced content, interest model, level-of-detail, point of interest, visualization


    CoverageScience Citation Index

    ISSN: 1365-8816

    RightsLink
    Posted Aug 5, 2015, 8:06 PM by Byounghyun Yoo
  • Automatic spline smoothing of non-stationary kinematic signals using bilayered partitioning and blending with correlation analysis
    Suchul Shin, Byounghyun Yoo*, and Soonhung Han, Digital Signal Processing, 39, pp.22-34, April 2015. 
    (*Corresponding author) 

    Abstract: Measurement errors of kinematic signals introduced by motion capture systems are unacceptably amplified when differentiating the signal to derive acceleration. Existing fully automatic methods for solving this problem have a weakness on non-stationary signals involving impacts, while semi-automatic methods each require that users carefully determine the values of configurable parameters. We propose an automatic method that estimates acceleration from non-stationary kinematic signals using bilayered partitioning and blending (BPB) with correlation analysis. The method has a configurable parameter, the partition length, and the recommended value of the partition length that is empirically derived can be used without prior knowledge of kinematic signals. Having applied this algorithm to synthetic sinusoidal data, benchmarking data in the biomechanics community, and our own measurement data, we compared the results with those of existing automatic methods. The evaluation confirms that the proposed method estimates acceleration more accurately from non-stationary signals than existing fully automatic methods and is more robust than existing semi-automatic methods.

    Keywords: acceleration estimation, kinematic signal, non-stationary data, correlation analysis, bilayered partitioning and blending (BPB)


    CoverageScience Citation Index


    ISSN: 1051-2004
    Posted Apr 29, 2015, 4:22 AM by Byounghyun Yoo
  • Visualization and level-of-detail of metadata for interactive exploration of sensor web
    Byounghyun Yoo and V. Judson Harward, International Journal of Digital Earth, 7(11), pp.847-869, September 15, 2014

    Abstract: There are several issues with Web-based search interfaces on a Sensor Web data infrastructure. It can be difficult to 1) find the proper keywords for the formulation of queries and 2) explore the information if the user does not have previous knowledge about the particular sensor systems providing the information. We investigate how the visualization of sensor resources on a 3D Web-based Digital Earth globe organized by level-of-detail (LOD) can enhance search and exploration of information by easing the formulation of geospatial queries against the metadata of sensor systems. Our case study provides an approach inspired by geographical mashups in which freely-available functionality and data are flexibly combined. We use PostgreSQL, PostGIS, PHP and X3D-Earth technologies to allow the Web3D standard and its geospatial component to be used for visual exploration and LOD control of a dynamic scene. Our goal is to facilitate the dynamic exploration of the Sensor Web and allow the user to seamlessly focus in on a particular sensor system from a set of registered sensor networks deployed across the globe. We present a prototype metadata exploration system featuring levels-of-detail for a multi-scaled Sensor Web as a Digital Earth application.

    Keywords: sensor web data visualization, sensor web data discovery and search, level-of-detail, metadata visualization, Web3D standard, extensible 3D graphics, X3D geospatial component


    CoverageScience Citation Index Expanded

    ISSN: 1753-8947


    Posted Feb 8, 2015, 12:06 AM by Byounghyun Yoo
  • A framework for automatic creation of motion effects from theatrical motion pictures
    Suchul Shin, Byounghyun Yoo*, and Soonhung Han, Multimedia Systems, 20(3), pp.327-346, June 2014
    (*Corresponding author) 

    Abstract: Motion effects are the most important physical effects of commercial feature films in the latest cinemas equipped with multi-sensory-effect systems known as 4DX theaters. This paper presents a framework for automatically generating motion effects from a video. We propose a seven-step motion-effect production pipeline based on the concept of structure from motion. In particular, we present the total-variation-based adaptive noise reduction method to remove acceleration noise and introduce methods to estimate the gravity direction from an image. The proposed framework is validated by prototype application to a syn- thetic video, a commercial feature film, a ride film, and three point-of-view (POV) footages.

    Keywords: motion effect, physical effect, multimedia, theater experience


    CoverageScience Citation Index

    ISSN: 0942-4962
    Posted Feb 8, 2015, 12:06 AM by Byounghyun Yoo
  • Webizing mobile augmented reality content
    Sangchul Ahn, Heedong Ko, and Byounghyun Yoo*, New Review of Hypermedia and Multimedia, 20(1), pp.79-100, March 21, 2014
    (*Corresponding author) 

    Abstract: This paper presents a content structure for building mobile augmented reality (AR) applications in HTML5 to achieve a clean separation of the mobile AR content and the application logic for scaling as on the Web. We propose that the content structure contains the physical world as well as virtual assets for mobile AR applications as document object model (DOM) elements and that their behaviour and user interactions are controlled through DOM events by representing objects and places with a uniform resource identifier (URI). Our content structure enables mobile AR applications to be seamlessly developed as normal HTML documents under the current Web eco-system.

    Keywords: augmented reality, cyber physical system, hypermedia, mobile computing, Web of things


    CoverageScience Citation Index Expanded

    ISSN: 1361-4568

    Posted Feb 8, 2015, 12:06 AM by Byounghyun Yoo
  • Rapid three-dimensional urban model production using bilayered displacement mapping
    Byounghyun Yoo, International Journal of Geographical Information Science, 27(1), pp.24-46, January 2013. 

    Abstract: The depiction and navigation of large-scale urban landscapes are limited by the great cost of traditional computer-aided design (CAD) models for large urban environment in terms of both the labor of data entry and the runtime computational expense. This article presents a hybrid modeling approach that enables rapid urban model production from legacy spatial data. Our scheme fills the gap between the low geometry models, such as photo-textured digital terrains, and high geometry models, such as true three-dimensional CAD models. To achieve optimal performance in modeling and rendering, we employ bilayered displacement mapping consisting of global displacement mapping (GDM) for terrains and local displacement mapping (LDM) for buildings. The LDM is performed only within image processing so that the complexity of the models depends only on the area of an urban model. We present a use case of rapid urban model production to compare our approach with the traditional polygonal urban models of a widely used geo-browser.

    Keywords: urban modeling, image-based modeling, hybrid urban model, displacement mapping


    CoverageScience Citation Index

    ISSN: 1365-8816
    Posted Feb 8, 2015, 12:06 AM by Byounghyun Yoo
  • Web-based information exploration of Sensor Web using the HTML5/X3D integration model
    Byounghyun Yoo, IADIS International Journal on WWW/Internet, 10(2), pp.107-120, December 2012. 

    Abstract: We investigate how the visualization of sensor resources on a 3D Web-based globe organized by level- of-detail can enhance search and exploration of information by easing the formulation of geospatial queries against the metadata of sensor systems. Our case study provides an approach inspired by geographical mashups in which freely-available functionality and data are flexibly combined. We use PostgreSQL, PostGIS, PHP, X3D-Earth and X3DOM to allow the Web3D standard and its geospatial component to be used for visual exploration and level-of-detail control of a dynamic scene. The proposed approach facilitates the dynamic exploration of the Sensor Web and allows the user to seamlessly focus in on a particular sensor system from a set of registered sensor networks deployed across the globe. We present a prototype metadata exploration system featuring levels-of-detail for a multi-scaled Sensor Web and use it to visually explore sensor data of weather stations.

    KeywordsWeb3D, Extensible 3D (X3D) Graphics, Sensor Web, X3DOM, HTML5

    DOI:

    Coverage:

    ISSN: 1645-7641
    Posted Nov 24, 2013, 5:48 AM by Byounghyun Yoo
  • Protruded displacement mapping for image-based urban representation
    Byounghyun Yoo, IEICE Electronics Express, 8(13), pp.1022-1027, July 2011.

    Abstract: This paper introduces a displacement mapping algorithm that represents protruded shapes on the surface of an object. Two verticalsurfaces that are perpendicular to the underlying surface are added along the boundary of the polygon surface in order to represent pixels overflowing acrossthe boundary of the polygon surface. The proposed approach can accurately represent the silhouettes of protruded shapes. Using per-pixel instructions on graphics hardware, the approach is accelerated and executed in real-time. The proposed method provides an effective solution for the representation of protruding shapes such as high-rise buildings in an urban environment which can be used in location based applications of mobile electronic devices.

    Keywords: graphics library, image-based rendering, displacement mapping


    CoverageScience Citation Index Expanded

    ISSN: 1349-2543
    Posted Feb 8, 2015, 12:07 AM by Byounghyun Yoo
  • An underwater vehicle simulator with immersive interface using X3D and HLA
    Pilwon Hur, Jungsam Yang, Soonhung Han, and Byounghyun Yoo, Simulation: Transactions of The Society for Modeling and Simulation International, 85(1), pp.33-44, January 2009.

    Abstract: Training war fighters how to maneuver a submarine is very important, but the use of real submarines in such training is expensive and hindered by regional and temporal limitations. Modeling and simulation (M&S) can be a good alternative to costly training. However, the use of existing M&S for submarines has limitations. For instance, the commercial software and hardware need to be kept in a secure place. Depending on the location of the protected software, war fighters may travel far and take a considerable time to get to these places. Long-distance travel also means they have a limited amount of time to train on the M&S machines. Furthermore, many types of M&S have only a one-channel display system, which reduces immersiveness. Another problem is that few heterogeneous simulators can be used as an integrated system. One solution to these problems involves the use of X3D, a platform-independent and open standard graphic file format, which can be used with general-purpose PCs. The immersiveness is increased by means of a multichannel display system and a motion chair. Finally, the individual components of a simulator can be integrated with the high level architecture and run time infrastructure (HLA/RTI). We demonstrate the proposed method through experiments with an underwater vehicle simulator.

    Keywords: high level architecture (HLA), modeling and simulation, motion chair, multichannel, Extensible 3D (X3D) Graphics

    DOI: 10.1177/0037549708101180

    CoverageScience Citation Index Expanded

    ISSN
    : 0037-5497
    Posted Aug 29, 2015, 9:20 AM by Byounghyun Yoo
  • Image-based modeling of urban buildings using aerial photographs and digital maps
    Byounghyun Yoo and Soonhung Han, Transactions in GIS, 10(3), pp.377-394, May 2006.

    Abstract: A VR (virtual reality) simulator which is used for helicopter simulations requires a virtual environment of real world urban areas. However, real urban environments are continuously changing. It is necessary to develop a modeling method that makes direct use of GIS (geographical information system) data which is updated periodically. A flight simulation needs to visualize not only buildings in the near distance but also a large number of buildings in the far distance. We propose a method for modeling urban environments from aerial images and digital maps with relatively little manual work. An image-based method is applied to the urban modeling that considers the characteristics of Korean cities. Buildings in the distance can be presented without creating a large number of polygons. The proposed method consists of a pre-processing stage that prepares the model from the GIS data and a modeling stage that creates the virtual urban environment. The virtual urban environment utilizes the height map of buildings.

    DOI: 10.1111/j.1467-9671.2006.01003.x

    CoverageSocial Sciences Citation Index

    ISSN
    : 1361-1682
    Posted Feb 8, 2015, 12:07 AM by Byounghyun Yoo
  • Representation of urban buildings using modified relief mapping
    Byounghyun Yoo and Soonhung Han, Journal of Computer Science and Technology, 21(2), pp.204-208, March 2006.

    Abstract: This paper describes the real-time mapping displacement of buildings onto the polygon model of base terrain of geo-spatial information. The buildings are represented as height maps, leading to low memory requirements and not involving changes of the original geometry (i.e., no vertices are created or displaced). The displacement of buildings is mapped toward the protruding direction. The base of texture which represents the ground in topography is correctly mapped onto base polygon without any distortion. This approach can exhibit the correct occlusions between buildings and ground due to parallax and correct self-occlusion.

    Keywords: aerial photograph, digital map, displacement mapping, geo-visualization, image-based rendering

    DOI: 10.1007/s11390-006-0204-8

    CoverageScience Citation Index Expanded

    ISSN
    : 1000-9000
    Posted Feb 8, 2015, 12:07 AM by Byounghyun Yoo
Showing posts 1 - 13 of 13. View more »

International Conference

  • Webized 3D experience by HTML5 annotation in 3D Web
    Daeil Seo, Byounghyun Yoo*, and Heedong Ko, ACM International Conference on 3D Web Technology (Web3D), Heraklion, Crete, Greece, pp.73-80,  June 18-21, 2015. 
    (*Corresponding author) 

    Abstract: With the development of 3D Web technologies, 3D objects are now handled as embedded objects without plug-ins on web pages. Although declarative 3D objects are physically integrated into web pages, 3D objects and HTML elements are still separated from the perspective of the 3D layout context, and an annotation method is lacking. Thus it is scarcely possible to add meaningful annotations related to target 3D objects using existing web resources. In addition, people often lose the relationship between the target and related annotation objects in a 3D context due to the separation of the content layouts in different 3D contexts. In this paper, we propose a webizing method for annotating user experiences with 3D objects in a 3D Web environment. The relationship between the 3D target object and the annotation object is declared by means of web annotations and these related objects are rendered with a common 3D layout context and a camera perspective. We present typical cases of 3D scenes with web annotations on the 3D Web using a prototype implementation system to verify the usefulness of our approach.

    Keywords: 3D Web, annotation, display algorithms, HTML5, user experience, virtual reality, webizing 

    DOI10.1145/2775292.2775301

    Conference websitehttp://web3d2015.web3d.org
    Posted Jul 7, 2015, 6:19 PM by Byounghyun Yoo
  • Tour Cloud Mobile: Helping tourists acquire the information effectively using three types of views
    Jungbin Kim, Byounghyun Yoo*, and Heedong Ko, IEEE International Conference on Consumer Electronics (ICCE), Las Vegas, NV, USA, pp.673-674, January 9-12, 2015. 
    (*Corresponding author) 

    Abstract: This paper presents a mobile application that helps tourists acquire information using three types of views—AR, map, and list view—each of which has different drawbacks and benefits. To deal with the disadvantages of each view, we propose a view-management component to change the layout depending on the context. 

    Keywords: content, tour, mobile AR, view management, list, map

    Conference websitehttp://www.icce.org
    Posted Aug 29, 2015, 9:50 AM by Byounghyun Yoo
  • Collective heterogeneous sensor mashup for enriched personal healthcare activity logging
    Daeil Seo, Byounghyun Yoo*, and Heedong Ko, IEEE International Conference on Consumer Electronics (ICCE), Las Vegas, NV, USA, pp.34-35, January 9-12, 2015. 
    (*Corresponding author) 

    Abstract: There has been a proliferation of wearable devices and mobile apps for activities monitoring. However, no model has been put forth to complementarily integrate the monitored data. We propose an enriched activity model to reorganize personal activity logs from heterogeneous sensors and to visualize logs in a harmonized way with a meaningful summary. 

    Keywords: healthcare system, healthcare informatics

    Conference websitehttp://www.icce.org
    Posted Aug 29, 2015, 9:50 AM by Byounghyun Yoo
  • Visual interaction for spatiotemporal content using zoom and pan with level-of-detail
    Daeil Seo, Byounghyun Yoo*, and Heedong Ko, IEEE Visualization Conference (VIS), Paris, France, November 9-14, 2014. 
    (*Corresponding author) 

    Abstract: It is easy to get lost while browsing and navigating spatiotemporal content, and the problem is exacerbated by the exponential growth of geospatial data with mobile phones and tablets. In this paper, we propose a continuous method of transition visualization with zooming and panning interaction of the maps and timelines on touch-based devices that maintains the spatial and temporal context of spatiotemporal content.

    Keywords: spatiotemporal content, level-of-detail, zoom and pan, immersive visual interaction

    Posted Aug 29, 2015, 9:50 AM by Byounghyun Yoo
  • [DEMO] Insight: Webized mobile AR and real life use cases
    Joohyun Lee, Jungbin Kim, Jinwoo Kim, Sungkuk Chun, Iltae Kim, Junsik Shim, Sangchul Ahn, Byounghyun Yoo*, and Heedong Ko, IEEE International Symposium on Mixed and Augmented Reality (ISMAR), Munich, Germany, September 10-12, 2014. 
    (*Corresponding author) 

    Abstract: This demonstration shows a novel approach for webizing mobile augmented reality, which uses HTML as its content structure, and its real life use cases. Insight is a mobile AR Web browser that executes HTML5-based AR applications. By extending physical objects and places with Uniform Resource Identifier (URI), we could build objects of interest for mobile AR application as DOM (Document Object Model) elements and control their behavior and user interactions through DOM events in standard HTML documents. A new CSS media type is defined to augment virtual objects to the physical objects. In this model, we introduce the concept of PLACE, which is the model of physical space in which the user can be located. With this approach, mobile AR applications can be developed as common HTML documents seamlessly under current Web eco-system. The advantage of the webized mobile AR, which is able to utilize all kind of Web resources without rework, and its high productivity arisen from the seamless development of AR contents in HTML documents are shown with real life use cases in various domains such as shopping, entertainment, education, and manufacturing. 

    Keywords: authoring environment, content structure, mobile AR, real life, Web architecture, World Wide Web
    Posted Jan 18, 2016, 10:34 PM by Byounghyun Yoo
  • View management for webized mobile AR contents
    Jungbin Kim, Joohyun Lee, Byounghyun Yoo*, Sangchul Ahn, and Heedong Ko, IEEE International Symposium on Mixed and Augmented Reality (ISMAR), Munich, Germany, September 10-12, 2014. 
    (*Corresponding author) 

    Abstract: Information presentation technique is important in augmented reality applications as it is in the traditional desktop user interface (WIMP) and Web user interface. This paper introduces view management for a web-based augmented reality mobile platform. We use a webized mobile AR browser called Insight that provides separation of the application logic including tracking engine and AR content, so that the view management logic and contents are easy to reuse. In addition, the view management is able to accommodate in-situ context of an AR application.

    Keywords: content, layout management, mobile AR, view management, Web architecture
    Posted Apr 5, 2015, 6:10 PM by Byounghyun Yoo
  • Integration of X3D Geospatial in a data driven Web application
    Michael McCann, Byounghyun Yoo, and Don Brutzman, ACM International Conference on 3D Web Technology (Web3D), Vancouver, Canada, pp.145-145, August 8-10, 2014.  

    Abstract: The Monterey Bay Aquarium Research Institute designed the Spatial Temporal Oceanographic Query System (STOQS) to create new capabilities for scientists to gain insight from their data. STOQS employs open standards and is a 100% free and open source project. It includes a Web-based graphical user interface where X3D Geospatial has been integrated to enable 3D geospatial data visualization. 

    Keywords: geospatial methodology and techniques, oceanography, sensor data, X3D, X3DOM

    Conference websitehttp://web3d2014.web3d.org
    Posted Jun 16, 2015, 8:31 PM by Byounghyun Yoo
  • A comparative study of 3D Web integration models for the Sensor Web
    Sangchul Ahn, Byounghyun Yoo*, and Heedong Ko, ACM International Conference on 3D Web Technology (Web3D), San Sebastian, Spain, pp.199-203, June 20-22, 2013. 
    (*Corresponding author) 

    Abstract: To facilitate the dynamic exploration of the Sensor Web and to allow users seamlessly to focus on a particular sensor system from a set of registered sensor networks deployed across the globe, interactive 3D graphics on the Web, which enables sensor data exploration featuring a good level of detail for a multi-scaled Sensor Web, is necessary. A comparative study of decent approaches to integrate Sensor Web information with the latest 3D Web technology and the geospatial Web has been conducted. We implemented prototype systems in three different 3D Web integration models, i.e., a common X3D model, the X3DOM integration model, and a webized AR content model. This paper presents examples of our prototype implementations using various approaches and discusses the lessons learned.

    Keywords: 3D Web, augmented reality, geospatial Web, hypermedia, HTML 5, Sensor Web 

    DOI10.1145/2466533.2466562

    Conference websitehttp://web3d2013.web3d.org
    Posted Jun 16, 2015, 8:28 PM by Byounghyun Yoo
  • Web-based information exploration of Sensor Web using the HTML5/X3D integration model
    Byounghyun Yoo*IADIS International Conference WWW/Internet, Madrid, Spain, October 18-21, 2012. 
    (*Best paper award winner

    Abstract: We investigate how the visualization of sensor resources on a 3D Web-based globe organized by level-of-detail can enhance search and exploration of information by easing the formulation of geospatial queries against the metadata of sensor systems. Our case study provides an approach inspired by geographical mashups in which freely-available functionality and data are flexibly combined. We use PostgreSQL, PostGIS, PHP, X3D-Earth and X3DOM to allow the Web3D standard and its geospatial component to be used for visual exploration and level-of-detail control of a dynamic scene. The proposed approach facilitates the dynamic exploration of the Sensor Web and allows the user to seamlessly focus in on a particular sensor system from a set of registered sensor networks deployed across the globe. We present a prototype metadata exploration system featuring levels-of-detail for a multi-scaled Sensor Web and use it to visually explore sensor data of weather stations.

    Keywords: Web3D, Extensible 3D (X3D) Graphics, Sensor Web, X3DOM, HTML5

    Conference website: http://www.internet-conf.org
    Posted Apr 5, 2015, 6:09 PM by Byounghyun Yoo
  • Visualization and level-of-detail of metadata for interactive exploration of Sensor Web
    Byounghyun Yoo, Workshop on Sensor Web Enablement 2011 (SWE 2011), part of The 2011 Cybera Summit on Data For All, Banff, AB, Canada, October 6-7, 2011.

    Abstract: There are several issues with Web-based search interfaces on a Sensor Web data infrastructure. It can be difficult to 1) find the proper keywords for the formulation of queries and 2) explore the information if the user does not have previous knowledge about the particular sensor systems providing the information. We investigate how the visualization of metadata on a 3D Web-based globe organized by level-of-detail can enhance search and exploration of information by easing the formulation of geospatial queries against the metadata of sensor systems. Our case study provides an approach inspired by geographical mashups in which freely-available functionality and data are flexibly combined. We use PostgreSQL, PostGIS, PHP and X3DEarth technologies to allow the Web3D standard and its geospatial component to be used for visual exploration and level-of-detail control of a dynamic scene. Our goal is to facilitate the dynamic exploration of the Sensor Web and allow the user to seamlessly focus in on a particular sensor system from a set of registered sensor networks deployed across the globe. We present a prototype metadata exploration system featuring levels-of-detail for a multi-scaled Sensor Web and use it to visually explore personal and project-based local weather stations.

    Keywords: Sensor Web data visualization, Sensor Web data discovery and search, level-of-detail, metadata visualization, Web3D standard, Extensible 3D Graphics, X3D Geospatial Component


    Presentation video: YouTube
    Posted Jun 28, 2014, 12:09 AM by Byounghyun Yoo
  • Web-service and subsystems for sharing meteorological data through cyber-infrastructure for environmental sensing and modeling
    Byounghyun Yoo and Judson Harward, GSDI (Global Spatial Data Infrastructure Association) 12 World Conference, Singapore, October 19-22, 2010.

    Abstract: We introduce a web-service and its subsystems for scientific data exchange that is geographically referenced. This system has been designed for interdisciplinary research groups who conduct various scientific observations and generate their own scientific data in different environmental engineering area. These data include raw data from physical sensing and processed data from simulation, assimilation, and data processing. A cyber-infrastructure provides functionality for researchers to extend the longevity of their data, to facilitate data discovery, and to provide data access for authorized users. The cyber-infrastructure is intended to utilize a federated data repository model in which individual research projects will provide their own data storage either on standard file servers or in relational database management systems. This paper introduces central cyber-infrastructure and focuses on functionality and mechanism of federated data repository model. We implemented a data repository utilizing initial sensor data from an urban meteorology project of residential area in Singapore for validation of our system architecture. In order to provide mechanisms for data discovery by other researchers as well as data access for authorized users, produced data is managed with spatial-relational database management system. The data is geographically referenced for efficient discovery in geospatial context. Domain knowledge and metadata is captured from data producer and used for design of backend database system. The data Repository has two major components. For the data provider, there is a web service interface for data submission and publication, and for data discovery and sharing through the central cyber-infrastructure, there is a separate web service interface that communicates with the distributed data broker of the central cyber-infrastructure. The data provider uses a server-side application that provides a web-based user interface to enable uploading, parsing and storing of data in the data repository. Metadata of each data generated from the data provider takes important roles in this system for providing data alignment and communication with the central cyber-infrastructure. A web-based query interface supports data exports in a variety of common file formats such as Excel, Word, XML, CSV, and PDF. Other available tools enable interactive web-based visualizations and geospatial representations of datasets. This allows query output to be immediately displayed in geo-web environment. This data repository model will grow into a general data exchange facility with the central cyber-infrastructure for environmental sensing and modeling research.

    Keywords: cyber-infrastructure, environmental data, data exchange, metadata, sensor data, Web service

    Posted Jun 28, 2014, 12:08 AM by Byounghyun Yoo
  • X3D Earth: Open standard-based virtual globes for digital earth infrastructure
    Byounghyun Yoo, Don Brutzman, and Soonhung Han, International Symposium on Remote Sensing 2009, Busan, Korea, pp.293-296, October 28-30, 2009.

    Abstract: Digital Earth is being re-evaluated and there are weakness and limitations in geobrowsers despite of its successful widespread adoption. Especially the interoperability of virtual globes, neutrality of digital earth model, and openness are tasks to be solved for putting forward the vision of the Digital Earth. This paper presents an open standard-based approach for digital representations of the Earth that enable a person to explore and interact with the vast amounts of natural and cultural information gathered about the Earth. The proposed approach is utilizing the Extensible 3D Graphics (X3D) Geospatial Component in order to guarantee interoperability of information interchange and prevent audience being bounded by single digital earth system that is statedly mass-market oriented such as Google Earth. The intent here is to provide a mechanism for producers to present and publish geospatial information and for users to navigate and search for it. This work facilitates users to build their own specially designed Digital Earth depending on their distinct set of needs for information visualization about our planet.

    Keywords: digital earth, virtual globe, Extensible 3D Graphics (X3D) Geospatial Component, X3D Earth, GIS, spatial data infrastructures, interactive simulation interoperability

    Conference websitehttp://www.isrs.or.kr
    Posted Dec 9, 2014, 4:47 AM by Byounghyun Yoo
  • X3D Earth terrain-tile production chain for georeferenced simulation
    Byounghyun Yoo and Don Brutzman, ACM International Conference on 3D Web Technology (Web3D), Darmstadt, Germany, pp.159-166, June 16-17, 2009.

    Abstract: Broad needs for digital models of real environments such as 3D terrain or cyber cities are increasing. Many applications related to modeling and simulation require virtual environments constructed from real-world geospatial information in order to guarantee relevance and accuracy in the simulation. The most fundamental data for building virtual environments, terrain elevation and orthogonal imagery, is typically acquired using optical sensors mounted on satellites or airplanes. Providing interoperable and reusable digital models in 3D is important for promoting practical applications of high-resolution airborne imagery. 
    This paper presents research results regarding virtual-environment representations of geospatial information, especially for 3D shape and appearance of virtual terrain. It describes a framework for constructing real-time 3D models of large terrain based on highresolution satellite imagery. This approach is also suitable for underwater bathymetry. The Extensible 3D Graphics (X3D) Geospatial Component standard is applied to produce X3D Earth models with global scope. Efficient rendering, network retrieval and data caching/removal must all be optimized simultaneously, across servers, networks and clients, in order to accomplish these goals properly. Details of this standard-based approach for providing an infrastructure for real-time 3D simulation merging high-resolution geometry and imagery are also presented. This work facilitates open interchange and interoperability across diverse simulation systems and is independently usable by governments, industry, scientists and the general public.

    Keywords: Extensible 3D Graphics (X3D) Geospatial Component, X3D Earth, satellite imagery, interactive simulation interoperability

    DOI: 10.1145/1559764.1559789
    Posted Apr 5, 2015, 9:47 AM by Byounghyun Yoo
  • Real-time 3D simulation infrastructure for practical application of high-resolution satellite imagery
    Byounghyun Yoo, Don Brutzman, and Soonhung Han, International Symposium on Remote Sensing, Daejeon, Korea, pp.155-158, October 29-31, 2008.

    Abstract: The needs for digital models of real environment such as 3D terrain or cyber city model are increasing. Most of applications related with modeling and simulation require virtual environment constructed from geospatial information of real world in order to guarantee reliability and accuracy of the simulation. The most fundamental data for building virtual environment, terrain elevation and orthogonal imagery is acquired from optical sensor of satellite or airplane. Providing interoperable and reusable digital model is important to promote practical application of high-resolution satellite imagery. This paper presents the new research regarding representation of geospatial information, especially for 3D shape and appearance of virtual terrain, and describe framework for constructing real-time 3D model of large terrain based on high-resolution satellite imagery. It provides infrastructure of 3D simulation with geographical context. Details of standard-based approach for providing infrastructure of real-time 3D simulation using high-resolution satellite imagery are also presented. This work would facilitate interchange and interoperability across diverse systems and be usable by governments, industry scientists and general public.

    Keywords: satellite image, interactive simulation, interoperability, X3D Earth, application infrastructure, standard

    Conference website: http://www.isrs.or.kr


    Posted Jul 5, 2014, 1:06 AM by Byounghyun Yoo
  • Silhouette management for protruded displacement mapping
    Byounghyun Yoo and Soonhung Han, ACM International Conference on Computer Graphics and Interactive Techniques, SIGGRAPH 2006 Sketches, Boston, MA, USA, July 30 - August 3, 2006.

    Abstracts: We present a technique to manage the silhouette of objects protruding from the surface without polygonal modeling of the object shape. The technique can represent the correct silhouette and the parallax of protruding shapes by solving the overflow problem that frequently occurs in image-based displacement mapping approaches.

    DOI: 10.1145/1179849.1180078
    Posted Jul 27, 2015, 9:50 AM by Byounghyun Yoo
  • A framework for a multi-sensory VR effect system with motional display
    Byounghyun Yoo, Moohyun Cha, and Soonhung Han, IEEE International Conference on Cyberworlds, Singapore, pp.237-244, November 23-25, 2005.

    Abstract: Virtual reality simulators have been developed as tools for the transfer of knowledge and education. Concurrently, the demand for exhibition systems of science education and cultural experiences has also increased. Existing VR (virtual reality) simulators, which are based on the calculation of dynamics equations, cannot easily be adapted to changes in simulation content. In order to transfer knowledge and maintain interest through educational applications, an experiential system that has multi-sensory effects as well as motion effects is needed. The authors proposed a method for motion generation that is tailored to riding systems and multi-sensory VR effects. In this study, both sense of motion, which is generated from movement of the viewpoint of the visual image, and motion effects, which are prepared in advance, are blended to realize motion simulation by the proposed method. Motion effects can easily be added by interaction between the user and the riding system. Various sensory cues are also implemented to the riding system.

    DOI: 10.1109/CW.2005.5
    Posted Jul 27, 2015, 9:49 AM by Byounghyun Yoo
  • Image-based representation of urban buildings using displacement mapping
    Byounghyun Yoo and Soonhung Han, Korea-China Joint Conference on Geometric and Visual Computing, Busan, Korea, pp.161-170, August 24-26, 2005.

    Abstract: This paper describes a representation for the real-time mapping displacement of buildings onto the polygon model of base terrain ingeo-spatial information. Geo-spatial information used for modelingthe virtual environment of flight simulation is similar to thedisplacement map. The buildings are represented as height maps,leading to a technique with very low memory requirements and notinvolving any changes of the model's original geometry (i.e., novertices are created or displaced). In this approach, thedisplacement of buildings is mapped toward the protruding direction.As a result, the base of texture which represents the ground intopography is correctly mapped onto base polygon without anydistortion. Since the displacement of buildings is applied as theheight field, instead of depth field as in previous approaches, theprotruding shape of buildings can be correctly represented. Thisapproach can exhibit the correct occlusions between buildings andground due to parallax and correct self-occlusion. The approach canbe used to consistently add representations of buildings to originalgeometric models of underlying terrain.

    Keywords: aerial photograph, digital map, displacement mapping, geo-visualization, image-based rendering

    Posted Jun 28, 2014, 12:12 AM by Byounghyun Yoo
  • KAIST interactive bicycle simulator
    Dong-Soo Kwon, Gi-Hun Yang, Chong-Won Lee, Jae-Cheol Shin, Youngjin Park, Byungbo Jung, Doo Yong Lee, Kyungno Lee, Soon-Hung Han, Byoung-Hyun Yoo, Kwang-Yun Wohn, and Jung-Hyun Ahn, IEEE International Conference on Robotics & Automation, Seoul, Korea, Vol. 3, pp.2313-2318, May 21-26, 2001.

    Abstract: This paper presents key technologies and system integration issues of the KAIST interactive bicycle simulator. The rider on the bicycle feels the motion and has the visual experience as if he/she is riding in the campus of the Korea Advanced Institute of Science and Technology. The simulator consists of a bicycle, a Stewart platform, a Magneto-Rheological handle and a pedal resistance system to generate motion feelings; the real-time visual simulator and the projection system; the sub-controllers and the integrating control network.

    Keywords: interactive systems , manipulator dynamics , real-time systems , simulation , virtual reality

    Posted Jul 5, 2014, 1:06 AM by Byounghyun Yoo
Showing posts 1 - 18 of 18. View more »

Books

  • Artificial intelligence technologies and the evolution of Web 3.0
    Tomayess Issa and Pedro Isaias (eds.), Artificial intelligence technologies and the evolution of Web 3.0, In press.

    Chapter title: Web-based information exploration of sensor web using the HTML5/X3D integration model

    ISBN9781466681477


    CoverageSCOPUS
    Posted May 17, 2016, 8:09 AM by Byounghyun Yoo
  • Proceedings of the 18th International Conference on 3D Web Technology
    Denis Graèanin, Byounghyun Yoo, and David Oyarzun (eds.), Publication of Conference: Web3D '13 The 18th International Conference on Web3D Technology, San Sebastian, Spain - June 20-22, 2013, ACM New York, NY, USA ©2013.

    Pages: 220
    Sponsor: SIGGRAPH ACM Special Interest Group on Computer Graphics and Interactive Techniques, Eurographics, Web 3D Consortium
    Publisher:  ACM New York, NY, USA

    ISBN: 978-1-4503-2133-4

    Posted Dec 9, 2013, 6:30 PM by Byounghyun Yoo
  • Proceedings of the 15th International Conference on 3D Web Technology
    Philipp Slusallek, Byounghyun Yoo, and Nicholas Polys (eds.), Publication of Conference: Web3D '13 The 15th International Conference on Web3D Technology, Los Angeles, CA, USA - July 24-25, 2010ACM New York, NY, USA ©2010.

    Pages: 197
    Sponsor: SIGGRAPH ACM Special Interest Group on Computer Graphics and Interactive Techniques, Eurographics, Web 3D Consortium
    Publisher:  ACM New York, NY, USA

    ISBN978-1-4503-0209-8

    Posted Dec 9, 2013, 6:25 PM by Byounghyun Yoo
Showing posts 1 - 3 of 3. View more »

Korean Journal

  • X3D based Web visualization by data fusion of 3D spatial information and video sequence
    Hong Gyoo Sohn, Seong Sam Kim, Byoung Hyun Yoo, and Sang Min Kim, Journal of the Korean Society for Geospatial Information System, 17(4), pp.95-103, 2009 December.

    Abstract: Global interests for construction of 3 dimensional spatial information has risen due to development of measurement sensors and data processing technologies. In spite of criticism for the violation of personal privacy, CCTV cameras equipped in outdoor public space of urban area are used as a fundamental sensor for traffic management, crime prevention or hazard monitoring. For safety guarantee in urban environment and disaster prevention, a surveillance system integrating pre-constructed 3 dimensional spatial information with CCTV data or video sequence is needed for monitoring and observing emergent situation interactively in real time.
    In this study, we proposed applicability of the prototype system for web visualization based on X3D, an international standard of real time web visualization, by integrating 3 dimensional spatial information with video sequence.

    Keywords: 3D spatial information, video sequence, data fusion, Web visualization, camera projective modeling

    Korean title: 3D 공간정보와 비디오 융합에 의한 X3D기반 웹 가시화 (한국지형공간정보학회지)

    UCI: G300-jX1404153.v17n4p95


    Posted Jul 5, 2014, 1:08 AM by Byounghyun Yoo
  • An open standard-based terrain tile production chain for geo-referenced simulation
    Byounghyun Yoo, Korean Journal of Remote Sensing, 24(5), pp.497-506, 2008 October.

    Abstract: The needs for digital models of real environment such as 3D terrain or cyber city model are increasing. Most of applications related with modeling and simulation require virtual environment constructed from geospatial information of real world in order to guarantee reliability and accuracy of the simulation. The most fundamental data for building virtual environment, terrain elevation and orthogonal imagery is acquired from optical sensor of satellite or airplane. Providing interoperable and reusable digital model is important to promote practical application of high-resolution satellite imagery. This paper presents the new research regarding representation of geospatial information, especially for 3D shape and appearance of virtual terrain, and describe framework for constructing real-time 3D model of large terrain based on high-resolution satellite imagery. It provides infrastructure of 3D simulation with geographical context. Web architecture, XML language and open protocols to build a standard based 3D terrain are presented. Details of standard-based approach for providing infrastructure of real-time 3D simulation using high-resolution satellite imagery are also presented. This work would facilitate interchange and interoperability across diverse systems and be usable by governments, industry scientists and general public.

    Keywords: interactive simulation, interoperability, X3D Earth, application infrastructure, standard

    Korean title: An open standard-based terrain tile production chain for geo-referenced simulation (대한원격탐사학회지)


    Posted Jun 28, 2014, 12:14 AM by Byounghyun Yoo
  • Displacement mapping for the precise representation of protrusion
    Byounghyun Yoo and Soonhung Han, Journal of KIISE (Korean Institue of Information Scientists and Engineers): Computer Systems and Theory, 33(10), pp.777-788, 2006 October.

    Abstract: This paper describes a displacement mapping technique which represents protruded shapes on the surface of an object. Previous approaches for image-based displacement mapping can represent only shapes depressed from the polygon surface. The proposed technique can represent shapes protruded from the underlying surface in real-time. Two auxiliary surfaces which are perpendicular to the underlying surface are added along the boundary of the polygon surface, in order to represent the pixels which overflow over the boundary of the polygon surface. The proposed approach can represent accurate silhouette of protruded shape. It can represent not only smooth displacement of protruded shape, but also abrupt displacement such as perpendicular protrusion by means of adding the supplementary texture information to the steep surface of protruded shape. By per-pixel instructions on the programmable GPU this approach can be executed in real-time. It provides an effective solution for the representation of protruded shape such as high-rise buildings on the ground.

    Keywords: image-based rendering, motion parallax, protruded shape representation, real-time rendering, silhouette rendering, steep displacement mapping, surface details

    Korean title: 정확한 돌출 형상의 표현을 위한 변위매핑 (정보과학회논문지 : 시스템 및 이론)



    Posted Jun 28, 2014, 12:14 AM by Byounghyun Yoo
  • A framework for VR effects with multi-sensory motional display
    Byounghyun Yoo and Soonhung Han, Journal of the Korea Society for Simulation, 14(3), pp.55-66, 2005 September.

    Abstract: Virtual reality (VR) simulators have been extended to transfer knowledge and education, and demands for exhibition systems for science education and cultural experiences has also increased. Existing VR simulators, which are based on the dynamics equations of motion, cannot easily be adapted to changes in simulation contents. In order to effectively transfer knowledge and maintain interests through educational applications, an experiential system that has multi-sensory effects as well as motion effects is required. In this study, we designed and implemented a motion generation that is tailored to experiential exhibition systems and multi-sensory VR effects. Both the sense of motion which is generated from the movement of the viewpoint of the visual image, and motion effects which are constructed in advance, are applied to motion simulation. Motion effects which occur during interaction between the user and the exhibition system can be easily added. Various sensory cues that are appropriate to the exhibition system are also considered.

    Keywords: motion generation, multi-sensory VR effect system, virtual reality simulator

    Korean title: 운동감 및 다감각 가상현실 효과 시스템의 구조와 응용 (한국시뮬레이션학회논문지)



    Posted Jun 28, 2014, 12:14 AM by Byounghyun Yoo
  • Image-based modeling of urban buildings using aerial photographs and digital maps
    Byounghyun Yoo and Soonhung Han, Journal of the Korean Association of Geographic Information Studies, 8(1), pp.49-62, 2005 March.

    Abstract: The VR (virtual reality) simulator such as helicopter simulation needs virtual environment of existing urban area. But the real urban environment keeps changing. We need a modeling method to make use of the GIS data that are updated periodically. The flight simulation needs to visualize not only buildings in near distance but also a large number of buildings in the far distance. We propose a method for modeling urban environment from aerial image and digital map with a comparatively small manual work. Image based modeling is applied to urban model which considers the characteristic of Korean cities. Buildings in the distance can be presented without creating a lot of polygons. Proposed method consists of the pre-processing stage which prepares the model from the GIS data and the modeling stage which makes the virtual urban environment. The virtual urban environment can be modeled with the simple process which utilizes the height map of buildings.

    Keywords: aerial image, digital map, displacement map, flight simulation, image-based modeling, urban modeling, virtual environment

    Korean title: 항공사진과 수치지도를 이용한 도시 건물의 이미지 기반 모델링 (한국지리정보학회지)

    KOI: KISTI1.1003/JNL.JAKO200510102436282

    Posted Jun 28, 2014, 12:14 AM by Byounghyun Yoo
  • Constructing virtual environment for flight simulators based on digital map
    Byounghyun Yoo and Soonhung Han, Transactions of the Society of CAD/CAM Engineers, 9(2), pp.148-157, 2004 June.

    Abstract: Interactive simulators that simulate mechanical systems are being developed for the purpose of performance evaluation of product design, replacement of physical training, and entertainment game. Use of flight simulator is increasing to reduce risk and cost of physical training, and we need virtual environment which covers large area terrain. We need a method that can reduce development cost and construction time of virtual environment that simulate the real environment. There have been attempts to link GIS or remote sensing field with virtual reality. This paper examines a method that helps to construct virtual environment, and attempts to link geographic information with virtual reality. A construction method of virtual environment based on digital map and satellite image has been studied.

    Keywords: flight simulation, GIS, level of detail, satellite image, virtual environment, virtual reality

    Korean title: 지리정보를 이용한 비행 시뮬레이터의 가상환경 구축 (한국CAD/CAM학회논문집)


    Posted Jun 28, 2014, 12:14 AM by Byounghyun Yoo
  • Boolean operation of non-manifold model with the data structure of selective storage
    Byounghyun Yoo* and Soonhung Han, Transactions of the Society of CAD/CAM Engineers, 5(4), pp.293-300, 2000 December. 
    (*Best paper award nominee) 

    Abstract: The non-manifold geometric modeling technique is to improve design process and to integrate design, analysis, and manufacturing by handling mixture of wireframe model, surface model, and solid model in a single data structure. For the non-manifold geometric modeling, Euler operators and other high level modeling methods are necessary. Boolean operation is one of the representative modeling method for the non-manifold geometric modeling. This thesis studies Boolean operations of non-manifold model with the data structure of selective storage. The data structure of selective storage is improved non-manifold data structure in that existing non-manifold data structures using ordered topological representation method always store non-manifold information even if edges and vertices are in the manifold situation. To implement Boolean operations for non-manifold model, intersection algorithm for topological cells of three different dimensions, merging and selection algorithm for three dimensional model, and Open Inventor™, a 3D toolkit of SGI, are used.

    Keywords: non-manifold modeling, solid modeling, Euler operations, Boolean operations, intersection, boundary representation

    Korean title: 선택저장 자료구조를 이용한 복합다양체 모델의 불리언 작업 (한국CAD/CAM학회논문집)

    Posted Jun 28, 2014, 12:14 AM by Byounghyun Yoo
Showing posts 1 - 7 of 7. View more »

Korean Conference

  • Combined AR authoring framework using desktop panorama and in-situ sensors
    Hyungjoo Lee, Joohyun Lee, Sangchul Ahn, Byounghyun Yoo, Heedong Ko, and Gerard J. Kim, Korea Computer Congress, Busan, Korea, June 25-27, 2014. 

    Abstract: 스마트폰의 급속한 보급으로 인하여 사용자는 많은 증강현실 어플리케이션을 접할 수 있게 되었다. 이에 따라 더 많은 증강현실 콘텐츠가 필요하게 되었지만, 소수의 전문 콘텐츠 저작자에 의해 공급되는 콘텐츠의 양은 수요를 충족시키기에 부족하다. 따라서 사용자가 직접 증강현실 콘텐츠를 저작할 필요가 있으나, 현장에서 직접 콘텐츠를 저작하고 다루는 것은 어렵다. 또한 원격 저작에서는 콘텐츠의 보정을 통한 정확도 향상에 한계를 갖는다. 본 논문에서는 이러한 문제점을 보완하기 위해 원격에서 파노라마 이미지를 이용한 저작과 저작된 콘텐츠를 현장에서 수정할 수 있는 프레임워크를 제안한다. 

    Korean title: 데스크탑 및 현장 환경이 결합된 AR 저작 프레임워크

    UCI


    Posted Apr 29, 2015, 4:42 AM by Byounghyun Yoo
  • Level-of-detail based adaptive mobile storytelling tour guide
    Daeil Seo, Byounghyun Yoo, Honam Bang, and Heedong Ko, Korea Computer Congress, Busan, Korea, June 25-27, 2014. 

    Abstract: 최근 개별 여행자가 증가함에 따라 다양한 모바일 스토리텔링 투어 가이드들이 등장하고 있지만, 여행자 의 관심 정도에 맞는 정보를 제공하지 못하고 있다. 본 논문에서는 여행자의 관심 정도에 따른 세밀도 (Level-of-Detail)를 정의하고, 여행 중 여행자의 실시간 상황 정보에 따른 관심 지점(Point of Interest) 추천 및 적응형 스토리텔링을 제공할 수 있는 콘텐츠 구조를 제안하고 그에 따른 적응형 모바일 스토리텔 링 투어 가이드를 구현하였다. 

    Korean title: 세밀도 기반 적응형 모바일 스토리텔링 투어 가이드

    UCI


    Posted Apr 29, 2015, 4:40 AM by Byounghyun Yoo
  • Design and integration of VR effect system with multi-sensory motional display
    Byounghyun Yoo* and Soonhung Han, Korea Society for Simulation Annual Conference, Busan, Korea, pp.93-99. May 28, 2005. 
    (*Best paper award winner) 

    Abstract: 가상현실 시뮬레이터는 교육과 지식의 전달을 위한 도구로 발전하고 있으며, 과학교육 및 문화체험을 위한 첨단과학전시시스템의 수요가 증가하고 있다. 동역학적 계산을 기반으로 하는 기존의 가상현실 시뮬레이터는 컨텐츠의 변경이 어려운 단점이 있으며, 효과적인 지식전달 및 흥미 유발을 위해서는 운동감뿐만 아니라 다감각을 동원한 체감 시스템이 필요하다. 본 연구에서는 체감형 전시 시스템에 적합한 운동감 생성 방법과, 다감각 동원 가상현실 효과 시스템을 설계하고 통합하였다. 제안된 방법은 영상의 시점변화를 기반으로 한 운동감 생성과, 미리 저장된 모션 라이브러리를 이용한 운동감 효과를 동시에 적용할 수 있으며, 관객의 상호작용에 의한 운동감 효과를 쉽게 추가할 수 있다. 관객의 다양한 감각을 이용한 가상현실 효과를 위하여 체감형 전시 시스템에 적합한 다양한 다감각 효과의 적용방안을 모색하고, 효율적인 다감각 효과를 선정하여 실제 시스템에 적용하였다. 이를 통하여 체감형 전시를 위한 가상현실 효과 시스템의 기본 구조를 정립하였다.

    Keyword: motion generation, multi-sensory VR effect system, virtual reality simulator

    Korean title: 다감각의 운동감을 갖는 가상현실 효과 시스템의 설계 및 통합 (한국시뮬레이션학회 학술대회 논문집)


    Conference websitehttp://www.simulation.or.kr
    Posted Jun 28, 2014, 12:15 AM by Byounghyun Yoo
  • Motion blending for VR simulator
    Moohyun Cha, Byounghyun Yoo, and Soonhung Han, Human-Computer Interaction (HCI) Conference, Daegu, Korea, pp.76-82, January 31 - February 3, 2005.

    Abstract: 운동 시뮬레이션 기술에 있어 운동감의 생성은, 일반적으로 대상 오브젝트의 운동에 대한 동역학적 계산에 의해 이루어진다. 사실적 운동감 효과 생성을 위해 보다 정밀한 수치 계산이 필요하지만, 많은 비용이 요구되며 실시간 시뮬레이션 기술의 적용에 어려움이 있다. 하지만 보다 현실적인 운동감 생성을 위한 요구는 계속되고 있으며, 이를 극복할 수 있는 여러 방안이 연구되고 있다. 이중 미리 생성된 다양한 모션 데이터(샘플)들을 서로 혼합하여, 실시간 운동감 효과를 재현하는 방법을 모션 합성(motion blending)이라 한다. 미리 계산되거나 샘플링 된 모션 데이터를 기존 모션에 중첩(superposition)하면, 복잡한 운동을 단순한 몇 가지 운동의 조합으로 표현할 수 있으며, 모션 데이터의 파라메트릭화를 통해 모션의 강도 및 주기를 자유롭게 제어할 수 있는 방법을 제공해 준다. 본 연구에서는 운동감 효과 재현을 실시간으로 구현하기 위해 샘플링에 의한 모션 데이터베이스 구축과 이를 중첩하는 motion blending 방법을 단계적으로 적용하여 가상현실 시뮬레이터에 응용하였다.

    Keyword: virtual reality, simulation, motion generation, VR effects

    Korean title: 가상 현실 운동감 효과를 위한 모션 중첩 (HCI 학술대회 논문집)

    Conference website: http://www.hcikorea.org
    Posted Jul 5, 2014, 1:09 AM by Byounghyun Yoo
  • Displacement mapping for real-time rendering of urban terrain model
    Byounghyun Yoo and Soonhung Han, Human-Computer Interaction (HCI) Conference, Pyeongchang, Korea, February 9-12, 2004.

    Abstract: 변위 매핑 (displacement mapping) 은 3차원 모델 표면의 상세한 표현을 통하여 실감을 높이기 위한 방법으로 사용된다. 비행 시뮬레이션과 같은 실외 환경의 가시화에 필요한 지형모델의 실시간 가시화를 위하여, 변위 매핑을 사용하여 지형 모델의 사실감을 높이고자 한다. 게임 등에 사용되는 가상의 자연환경 지형이 아닌, 도시와 같은 실존하는 지형의 대부분을 차지하는 건물의 표현을 위하여, 기존의 표현 방법을 분석하여 문제점을 제시하고 이를 해결하기 위한 방안을 제안한다. 보다 사실감 있는 실제 도시 지형모델을 제공하기 위하여, 건축물의 외형을 포함하는 지형가시화 방법을 제안하고, 실험을 통하여 기존의 방법의 문제점을 분석하여 개선 방법을 모색한다.

    Keyword: displacement mapping, terrain modeling and rendering, urban simulation

    Korean title도시 지형모델의 실시간 가시화를 위한 변위 매핑 (HCI 학술대회 논문집)

    Conference websitehttp://www.hcikorea.org
    Posted Jun 28, 2014, 12:15 AM by Byounghyun Yoo
  • Building virtual environment and mixed reality for a VR flight simulator
    Jonghwan Lee, Byounghyun Yoo, and Soonhung Han, Human-Computer Interaction (HCI) Conference, Pyeongchang, Korea, February 10-13, 2003.

    Abstract: 가상현실 비행 시뮬레이터에 사용하기 위한 실제 지형의 가상환경을 제작하고, 이를 스포츠 헬리콥터 시뮬레이터에 적용하였다. 실제 지형모델을 사용하기 위하여 국가지리정보시스템의 수치지도로부터 지형 모델을 만들고, 위성사진을 적용하여 높은 고도에서도 사용자에게 실제와 같은 가상환경을 보여주도록 하였다. 비행 시뮬레이터의 특성상 이착륙시와 같은 낮은 고도에서도 실제감을 높이기 위하여 한국과학기술원의 3 차원 모델을 지형모델과 함께 사용하였다. 또한 크로마키 기법을 이용한 혼합 가상 현실 시스템을 구축하였다. 사용자는 블루 스크린에 투영된 가상환경만이 아니라 자신의 손과 발을 포함한 조향장치를 HMD 에 부착된 CCD 카메라를 통하여 볼 수 있다. 본 연구를 통하여 비행 시뮬레이션을 위한 대규모 가상환경 제작과 혼합 가상환경 개발에 필요한 요소 기술과 경험을 축적하였다.

    Keywords: virtual environment, VR simulator, mixed reality, virtual reality

    Korean title: 비행 VR 시뮬레이터를 위한 가상환경 구축과 MR (HCI 학술대회 논문집)

    Conference website: http://www.hcikorea.org
    Posted Jul 5, 2014, 1:09 AM by Byounghyun Yoo
  • A VR simulator of sports helicopter
    Byounghyun Yoo, Soonhung Han, Jinung Ahn, Dong-Soo Kwon, Jun-Keol Song, Chong-Won Lee, Sunmin Kim, Youngjin Park, Kyungno Lee, and Doo Yong Lee, Human-Computer Interaction (HCI) Conference, Pyeongchang, Korea, February 10-13, 2003.

    Abstract: 1 인용 경량 스포츠 헬리콥터의 시뮬레이터를 개발하였다. 사용자는 운동판 위에 설치된 헬리콥터 목업에 탑승하여 HMD 상에 보여지는 그래픽 환경 내에서 실제 헬리콥터를 운전하듯 페달과 조향 장치를 조작하면서 현실적 운동감을 느끼고, 시각, 운동감, 음향 효과의 생생한 재현을 경험하게 된다. 또한, 현실과 혼합된 가상환경을 이용하여 사용자는 헬리콥터의 실제 모습과 가상환경을 동시에 보면서 운전할 수 있다. 개발된 헬리콥터 시뮬레이터는 다자유도의 운동감 재현시스템, 조향 스틱과 페달 반력 장치, 시각 시뮬레이터, 3 차원 음향 시스템, 그리고 각 세부 시스템의 제어 모듈과 혼합가상환경 시스템으로 구성되어 있다. 본 연구를 통해서 혼합가상환경을 이용한 비행 시뮬레이터 개발에 필요한 요소 기술과 경험을 축적하였다.

    Keywords: helicopter simulator, virtual reality, mixed reality

    Korean title: 스포츠 헬리콥터 VR 시뮬레이터 (HCI 학술대회 논문집)

    Conference website: http://www.hcikorea.org
    Posted Jul 5, 2014, 1:09 AM by Byounghyun Yoo
  • Constructing real-time terrain model for flight simulation
    Byounghyun Yoo and Soonhung Han, Society of CAD/CAM Engineers Annual Conference, Seoul, Korea, pp.267-274, January 30, 2002.

    Abstract: A flight simulator has different points to be considered compared to a driving simulator, because the operator can be located at any position of the virtual world. Especially, a helicopter moves more freely than a plane. We need more considerations and it is more difficult to visualize the terrain and scene of the virtual world for a helicopter VR simulator. This paper introduces a method for constructing real-time terrain models for the VR simulator of a light helicopter, and introduces the problems and research issues that are found in this process.

    Keywords: virtual reality, VR simulator, terrain modeling, real-time rendering

    Korean title: 비행 시뮬레이션을 위한 실시간 지형 데이터의 구축 (한국CAD/CAM학회 학술발표회 논문집)


    Conference website: http://www.cadcam.or.kr
    Posted Jun 28, 2014, 12:16 AM by Byounghyun Yoo
  • A simple generation of stereographic image using Z-buffer
    Byounghyun Yoo and Soonhung Han, Society of CAD/CAM Engineers Annual Conference, Seoul, Korea, pp.289-296, February 9, 2001.

    Abstract: In 3D computer graphics, especially entertainments, game, CAD, 3D graphic design, virtual reality and simulation, the stereography is used to augment the sense of presence or to increase three-dimensional effects. The stereography is one of methods to represent artificial image in three-dimension. But all conventional three-dimensional stereographic image generation methods require the amount of computation, which is twice the amount for generating non-stereo image. This results in considerable restrictions in use of stereographic images in three-dimensional real-time rendering. This paper has been made from the observation of the above problem. The objective of this paper is to provide a method for generating a stereographic image using the Z-buffer, where two planar images required for generation of the stereographic image are created through generation of one image and simple additional tasks which are based on the created two-dimensional image, color information, and depth information stored in the Z-buffer. Compared to the conventional three-dimensional stereographic image generation method, which requires twice the amount of computer calculation time of the non-stereo image generation method, the present method can readily and rapidly generate the stereographic image through the simple algorithm without doubling the calculation load of the computer.

    Keywords:  scientific visualization, computer graphics, 3D, stereography, Z-buffer

    Korean title: Z-버퍼를 이용한 스테레오영상 생성방법 (한국CAD/CAM학회 학술발표회 논문집)


    Conference websitehttp://www.cadcam.or.kr
    Posted Jun 28, 2014, 12:16 AM by Byounghyun Yoo
  • Bicycle virtual reality simulator
    Kyungno Lee, Doo Yong Lee, Dong-Soo Kwon, Gi-Hun Yang, Youngjin Park, Chanjoo Lee, Chong-Won Lee, Jae-Cheol Shin, Soon-Hung Han, Byoung-Hyun Yoo, Jae-Heon Yang, Jae-Hun Jung, Kwangyun Wohn, and Sehoon Kim, Human-Computer Interaction (HCI) Conference, Pyeongchang, Korea, February 5-7, 2001.

    Abstract: 본 연구에서 개발된 자전거 시뮬레이터에서는 사용자가 스튜워트 플렛폼 매니퓰레이터 위에 설치된 자전거를 타고 전방에 투시되는 그래픽 환경 내에서 실제 자전거를 주행하듯 페달과 조향 장치를 조작하면서 현실적 운동감과 시각, 음향 효과가 재현되는 경험을 하며 한국과학기술원 경내를 주행할 수 있게 한다. 자전거 시뮬레이터는 자전거를 포함하여, 운동감을 재현하는 스튜워트 플랫폼 매니퓰레이터 (SPM), 반력을 구현하는 조향장치와 페달 장치, 시각 시뮬레이터와 투사장치, 음향시스템, 그리고 각 세부 시스템의 제어 모듈과 그 연결 네트웍으로 구성되어 있다. 본 연구를 통해서 실용적인 양방향 시뮬레이터를 구축하기 위해 필요한 기술과 개발 경험을 축적하였으며, 2인 이상이 참여할 수 있는 네트웍 기반의 경주용 자전거 시뮬레이터를 개발하고 있다.

    Keywords: 자전거 시뮬레이터, 가상현실

    Korean title: 자전거 가상현실 시뮬레이터 (HCI 학술대회 논문집)

    Conference website: http://www.hcikorea.org
    Posted Jul 5, 2014, 1:09 AM by Byounghyun Yoo
  • Boolean operation of non-manifold model with the data structure of selective storage
    Byounghyun Yoo and Soonhung Han, Society of CAD/CAM Engineers Annual Conference, Seoul, Korea, pp.369-375, February 9, 1999.

    Abstract:

    The non-manifold geometric modeling technique is to improve design process and to integrate design, analysis, and manufacturing by handling mixture of wireframe model, surface model, and solid model in a single data structure. For the non-manifold geometric modeling, Euler operators and other high level modeling methods are necessary. Boolean operation is one of the representative modeling method for the non-manifold geometric modeling. This thesis studies Boolean operations of non-manifold model with the data structure of selective storage. The data structure of selective storage is improved non-manifold data structure in that existing non-manifold data structures using ordered topological representation method always store non-manifold information even if edges and vertices are in the manifold situation. To implement Boolean operations for non-manifold model, intersection algorithm for topological cells of three different dimensions, merging and selection algorithm for three dimensional model, and Open Inventor™, a 3D toolkit of SGI, are used.

    Keywords: non-manifold modeling, solid modeling, Euler operations, Boolean operations, intersection, boundary representation

    Korean title: 선택저장 자료구조를 이용한 복합다양체 모델의 불리언 작업 (한국CAD/CAM학회 학술발표회 논문집)


    Conference websitehttp://www.cadcam.or.kr
    Posted Dec 4, 2011, 4:51 PM by Byounghyun Yoo
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