• Journal of Advanced Marine Engineering and Technology
• /
• 제10권3호
• /
• pp.107-118
• /
• 1986

The presenet research attempts to examine the combustion characteristics and the structure of the flame in turbulent premixed flames and thus enhance the combustion performance that leads to the design of the effective combustion system (untilizing LNG). Following experimental investigations for several stabilized premixed flames were attempted to identify the interactive mechanism between flame structures and flow fields; Visualization by Schlieren method, measurement of flow velocity by LDV, detection of ion current by ion probe, measurement of fluctuating temperature by thermocouple having compensation circuit, average values with respect to time of fluctuating amount for flow velocity, temperature, ion current, etc., variable RMS values, PDFs, autocorrelation, crosscorrelation, spatial macroscale, power spectra, and velocity scale. Continuing the authors published studies whose flame dominated by coherent structures and the characteristics of combustion reaction for irregular three dimensional flame and stabilized flame by step were investigated with obtained experimental quantities. Results of this research are following : The most turbulent flames support the structure of a Wrinkled laminar flame or laminar flamelets. It also observed that combustion reaction is related to small tubulence microscales of the turbulent flow fields closly.

• 센서학회지
• /
• 제16권2호
• /
• pp.110-114
• /
• 2007

In this paper we present 3-D Navigation View, a three-dimensional visualization of indoor environment which serves as an intuitive and unified user interface for our developed indoor location tracking system via Virtual Reality Modeling Language (VRML) in web environment. The extracted user's spatial information from indoor location tracking system was further processed to facilitate the location indication in virtual 3-D indoor environment based on his location in physical world. External Authoring Interface (EAI) provided by VRML enables the integration of interactive 3-D graphics into web and direct communication with the encapsulated Java applet to update position and viewpoint of user periodically in 3-D indoor environment. As any web browser with VRML viewer plug-in is able to run the platform independent 3-D Navigation View, specialized and expensive hardware or software can be disregarded.

• 한국정보과학회:학술대회논문집
• /
• 한국정보과학회 2002년도 봄 학술발표논문집 Vol.29 No.1 (B)
• /
• pp.511-513
• /
• 2002

최근 가상현실과 Web 3D에 대한 관심이 고조되면서 관련 연구와 기술개발이 활발히 진행되고 있다. 본 논문에서는 Web 기반에서 3차원 그래픽을 표현하는 표준언어인 VRML을 이용하여, 원자력발전소에서 주기적으로 안정성 평가를 위해 수행하는 ISI(In-Service Inspection : 가동중검사) 업무에 적용하여 가상원전 3D ISI 시스템을 개발하고 그 구현방법을 제시한다. 검사대상 기기, 배관 및 각종 지지구조물에 대한 도면확보의 작업을 시작으로 하여, 3D 모델 구축, VR Data 작성, 그래픽 관리 시스템 개발 사례와 가상면실에 의해 구현된 Scene과 각종 DB글 연결하는 Interactive 3D Visualization Tool을 개발하여 기존의 2차원적 DB 운영을 3차원 가상공간에서 운영함으로써 보다 효과적이고 효율적인 DB 운용 방법에 대해서 기술한다.

• 대한기계학회논문집B
• /
• 제26권10호
• /
• pp.1364-1369
• /
• 2002

This paper introduces the development of the analysis and design program of valve train system. In order to verify the stability of design and improve the performance of system efficiently, it is required that integrated and interactive simulation program. The presented program is developed in the base of the object-oriented, capsulation, modulization, OLE (objected linking and embedding) and various design theory. It contains the expandability and flexibility of the structure. In addition to that, it is programmed to make the convenient user interface by using the visualization programming. This program can support the modification of the valve element as well as the development of the valve train system in the beginning of design. It is expected to save the cost and time for the design of valve train system.

• Journal of Astronomy and Space Sciences
• /
• 제32권2호
• /
• pp.151-159
• /
• 2015

The fundamental conception in physics of the propagation of the electromagnetic wave polarization in matter is newly understood as the cardinal keyword in free-space quantum communication technology and cosmology in astrophysics. Interactive visualization of the propagation mechanism of polarized electromagnetism in a medium with its helicity has accordingly received attention from scientists exploiting the protocol of quantum key distribution (QKD) to guarantee unconditional security in cryptography communication. We have provided a dynamic polarization platform for presenting the polarization modes of a transverse electromagnetic wave, converting the state of polarization through the arrangement of optical elements, using Jones vectors calculations in Methematica. The platform graphically simulates the mechanism of production and propagation of the polarized waves in a medium while satisfying Maxwell's equations.

• STI Policy Review
• /
• 제6권2호
• /
• pp.24-53
• /
• 2015

Foresight, a major methodological tool in the STI policy toolbox, has recently featured new directions in methodological development, becoming influenced by progress in information and communication technologies and online tools. However, no overview of these directions has been available so far. Based on a literature review, an interactive workshop, and an international expert survey as well as expert interviews, the research presented here attempts to shed light onto some of the relevant issues by providing a structured overview of recent changes in order to further the debate on the future directions of methodological development in foresight. The paper outlines four clusters of emerging approaches in foresight:Integrated qualitative and quantitative approaches, IT-based and automated foresight, experiential foresight including new forms of communication and interaction such as visualization and gaming, and open and crowd-sourced approaches. The benefits and challenges of the approaches known so far are categorized and summarized, and areas of potential use for each of the clusters in STI contexts are identified.

• 한국HCI학회:학술대회논문집
• /
• 한국HCI학회 2007년도 학술대회 2부
• /
• pp.592-597
• /
• 2007

인터랙티브 차임은 바람에 반응하여 소리를 내는 기존의 윈드 차임과 달리, 환경정보에 따라서 좀 더 의미 있는 소리를 낼 수 있도록 디자인한 것이다. 인터랙티브 차임은 실내에 설치되어 인간의 시각과 청각으로는 쉽게 인지할 수 없는 다양한 정보들을 알려주기 위한 목적으로 제안된 것으로서, 온도나 기압, 습도와 같은 외부 환경변수에 반응한다. 환경 변수에 따라서 음높이가 변화하며 사람이 쾌적하다고 느끼는 정도의 변수 값일 때, 울림효과와 같은 특수 효과를 통해 적당한 정도를 알려준다. 차임 소리는 서보모터에 의해 움직이는 유리관의 부딪힘을 통해 이루어지며, 음높이는 이 유리관에 채워진 물 높이를 변화시킴으로써 이루어진다. 유리관의 개수나, 처음 채워진 물높이에 따라 다양한 소리조합을 구현할 수 있으며 환경정보에 따른 음높이의 변화와 특수효과는 기존의 윈드 차임에서 느껴지는 정적인 울림의 한계를 넘어설 수 있게 한다.

• Spatial Information Research
• /
• 제4권2호
• /
• pp.189-195
• /
• 1996

3차원 형상표현 언어인 VRML을 이용하여 손쉽게 얻을 수 있는 DEM 데이타를 직접 인터넷상에서 가시화 하게 되면, VRML이용의 가장 큰 난점일 VRML형식 파일 작성작업이 필요없게 되어 즉자적으로 능동적인 3차원 지도를 이용할 수 있다. 본 논문에서는 DEM을 VRML파일로 만들어 인터넷 웹상에서 가시화 시키는 과정을 살펴보고 이를 이용한 인터넷 GIS의 한 가능성을 살펴본다.

• 디지털산업정보학회논문지
• /
• 제8권1호
• /
• pp.55-64
• /
• 2012

The advantage of direct volume rendering is to visualize structures of interest in the volumetric data. However it is still difficult to simultaneously show interior and exterior structures. Recently, cone beam computed tomography(CBCT) has been used for dental diagnosis. Despite of its usefulness, there is a limitation in the detection of interior structures such as pulp and inferior alveolar nerve canal. In this paper, we propose an efficient volume rendering model for visualizing important interior as well as exterior structures of dental CBCT. It is based on the concept of illustrative volume rendering and enhances boundary and silhouette of structures. Moreover, we present a new method that assigns a different color to structures in the rear so as to distinguish the front ones from the rear ones. This proposed rendering model has been implemented on graphics hardware, so that we can achieve interactive performance. In addition, we can render teeth, pulp and canal without cumbersome segmentation step.

• 한국조경학회지
• /
• 제24권3호
• /
• pp.29-41
• /
• 1996

The purposes of this study were to develope some techniques which can be used in the landscape simulation process using PC based computer grahics. As a result, a couple of utilities were programmed in AutoLISP language. The one(DSLINE.LSP) is to digitize 2-dimensional structuer forms in the interactive mode considering error handling, and the other one (IMPOST.LSP) is for superimposing and visualizing the digitized plan data to 3-dimension solids & surfaces referring to topographic elevations of meshes in digital terrain model. By applying utilities to present site, the followings may be described. 1) The utility DSLINE.LSP for digitizing simplified building structure form were proved to be easy to input data of polygons including orthogonal edges by handling user coordinates system and checking invalid intersection and default colsing. 2) IMPOST.LSP utility for superimposing and visualizing tool were proved to be more complicated and speedy in calculating process compared with a practical application of modeling tool before rendering process in landscape simulation of built environment on topographic relief, on specially mesospace level of assessment.