Publication List‎ > ‎

International Journal


Information fusion of heterogeneous sensors for enriched personal healthcare activity logging

posted Jan 19, 2016, 5:44 AM by Byounghyun Yoo   [ updated Jan 19, 2016, 5:48 AM ]

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

Prosumption perspectives on additive manufacturing: making consumer products reconfigurable with 3D printing

posted Aug 5, 2015, 8:05 PM by Byounghyun Yoo   [ updated Jun 28, 2016, 9:40 PM ]

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

Responsive geo-referenced content visualization based on a user interest model and levels of detail

posted Mar 23, 2015, 7:02 PM by Byounghyun Yoo   [ updated Aug 5, 2015, 8:06 PM ]

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

Automatic spline smoothing of non-stationary kinematic signals using bilayered partitioning and blending with correlation analysis

posted Dec 22, 2014, 3:18 AM by Byounghyun Yoo   [ updated Apr 29, 2015, 4:22 AM ]

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

Visualization and level-of-detail of metadata for interactive exploration of sensor web

posted Aug 22, 2014, 11:16 PM by Byounghyun Yoo   [ updated Feb 8, 2015, 12:06 AM ]

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


A framework for automatic creation of motion effects from theatrical motion pictures

posted Jun 28, 2014, 12:05 AM by Byounghyun Yoo   [ updated Feb 8, 2015, 12:06 AM ]

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

Webizing mobile augmented reality content

posted Oct 18, 2013, 1:13 AM by Byounghyun Yoo   [ updated Feb 8, 2015, 12:06 AM ]

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

Rapid three-dimensional urban model production using bilayered displacement mapping

posted Jan 30, 2012, 4:31 AM by Byounghyun Yoo   [ updated Feb 8, 2015, 12:06 AM ]

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

Web-based information exploration of Sensor Web using the HTML5/X3D integration model

posted Dec 3, 2008, 10:37 PM by Byounghyun Yoo   [ updated Nov 24, 2013, 5:48 AM ]

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

Protruded displacement mapping for image-based urban representation

posted Dec 3, 2008, 10:34 PM by Byounghyun Yoo   [ updated Feb 8, 2015, 12:07 AM ]

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

1-10 of 13