• Title/Summary/Keyword: 3D(three-dimensional)

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An Effect of Layered Earth on Magnetotelluric Responses of Three-Dimensional Bodies (3차원체의 MT응답에 미치는 층상대지의 효과)

  • Kim, Hee Joon;Hong, Chol Hoon
    • Economic and Environmental Geology
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    • v.27 no.5
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    • pp.491-498
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    • 1994
  • The integral equation method is used for magnetotelluric (MT) modeling of a finite inhomogeneity in a two-layered earth. An integral equation relates the incident plane-wave field and the scattering currents in the three-dimensional (3-D) inhomogeneity through the electric tensor Green's function appropriate to a layered earth. This paper describes an effect of overburden and basement on MT responses of 3-D body. The effect of overburden is to reduce the detectability of target, and the reduction of detectability is more apparent for conductive overburden than for resistive one. The effect of basement, on the other hand, may enhance the anomaly due to 3-D body in the upper layer. In case of the resistive basement current perturbations about the body tend to be confined to the more conductive upper layer.

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On the Efficient Three-Dimensional Inversion of Static Shifted MT Data (정적효과를 포함한 자기지전류 자료의 효율적인 3차원 역산에 관하여)

  • Jang, Hannuree;Jang, Hangilro;Kim, Hee Joon
    • Geophysics and Geophysical Exploration
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    • v.17 no.2
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    • pp.95-103
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    • 2014
  • This paper presents a practical inversion method for recovering a three-dimensional (3D) resistivity model and static shifts simultaneously. Although this method is based on a Gauss-Newton approach that requires a sensitivity matrix, the computer time can be greatly reduced by implementing a simple and effective procedure for updating the sensitivity matrix using the Broyden's algorithm. In this research, we examine the approximate inversion procedure and the weighting factor ${\beta}$ for static shifts through inversion experiments using synthetic MT data. In methods using the full sensitivity matrix constructed only once in the iteration process, a procedure using the full sensitivity in the earlier stage is useful to produce the smallest rms data misfit. The choice of ${\beta}$ is not critical below some threshold value. Synthetic examples demonstrate that the method proposed in this paper is effective in reconstructing a 3D resistivity structure from static-shifted MT data.

Three-dimensional Resistivity Inversion Including Topographic Effect (지형효과를 포함한 3차원 전기비저항 역산)

  • 박종오;김희준;송무영
    • The Journal of Engineering Geology
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    • v.14 no.1
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    • pp.21-28
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    • 2004
  • Three-dimensional (3-D) resistivity inversion including a topographic effect can be considered theoretically to be the technique of acquiring the most accurate image in the interpretation of resistivity data, because it includes characteristic image that the actual subsurface structure is 3-D. In this study, a finite-element method was used as the numerical method in modeling, and the efficiency of Jacobian calculation has been maximized with sensitivity analysis for the destination block in inversion process. Also, during the iterative inversion, the resolution of inversion can be improved with the method of selecting the optimal value of Lagrange multiplier yielding minimum RMS(root mean square) error in the parabolic equation. In this paper, we present synthetic examples to compare the difference between the case which has the toprographic effect and the other case which has not the effect in the inversion process.

Assessment of MJO Simulation with Global Coupled Model 2 and 3.1 (Global Coupled 모델 2와 3.1의 MJO 모의성능 평가)

  • Moon, Ja-Yeon;Kim, Ki-Young;Cho, Jeong-A;Yang, Young-Min;Hyun, Yu-Kyung;Kim, Baek-Jo
    • Atmosphere
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    • v.32 no.3
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    • pp.235-246
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    • 2022
  • A large number of MJO skill metrics and process-oriented MJO simulation metrics have been developed by previous studies including the MJO Working Group and Task Force. To assess models' successes and shortcomings in the MJO simulation, a standardized set of diagnostics with the additional set of dynamics-oriented diagnostics are applied. The Global Coupled (GC) model developed for the operation of the climate prediction system is used with the comparison between the GC2 and GC3.1. Two GC models successfully capture three-dimensional dynamic and thermodynamic structure as well as coherent eastward propagation from the reference regions of the Indian Ocean and the western Pacific. The low-level moisture convergence (LLMC) ahead of the MJO deep convection, the low-level westerly and easterly associated with the coupled Rossby-Kelvin wave and the upper-level divergence are simulated successfully. The GC3.1 model simulates a better three-dimensional structure of MJO and thus reproduces more realistic eastward propagation. In GC2, the MJO convection following the LLMC near and east of the Maritime Continent is much weaker than observation and has an asymmetric distribution of both low and upper-level circulation anomalies. The common shortcomings of GC2 and GC3.1 are revealed in the shorter MJO periods and relatively weak LLMC as well as convective activity over the western Indian Ocean.

Attribute Data Management for Developing the Database of a 3D Earthwork BIM System (3D 토공 BIM 시스템 데이터베이스 구축을 위한 속성 데이터 관리)

  • Moon, Sungwoo;Seo, Jongwon
    • Journal of KIBIM
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    • v.6 no.4
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    • pp.27-34
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    • 2016
  • A Building Information Model (BIM) is an attempt to simulate the process of building structures in a three-dimensional (3D) digital space. While the technology is usually applied to structured buildings, bridges, and underground facilities, it is rarely applied to an unstructured environment of earthwork operations. If a BIM is used for earthworks, the 3D simulation can be used for construction equipment guidance and earthwork management. This paper presents a real-time, 3D earthwork BIM that provides a 3D graphical simulation of excavators in conjunction with geographic modeling. Developing a real-time, 3D earthwork BIM requires handling a variety of factors, such as geographical information and vehicular movement. This paper mainly focuses on the management of these attributes and provides a database design for storing and retrieving data. In an example application, a prototype of the 3D earthwork BIM is presented to understand what it would provide when used during earthwork operations at a construction site.

A Study on the Development for 3D Audio Generation Machine

  • Kim Sung-Eun;Kim Myong-Hee;Park Man-Gon
    • Journal of Korea Multimedia Society
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    • v.8 no.6
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    • pp.807-813
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    • 2005
  • The production and authoring of digital multimedia contents are most important fields in multimedia technology. Nowadays web-based technology and related multimedia software technology are growing in the IT industry and these technologies are evolving most rapidly in our life. The technology of digital audio and video processing is utilizing rapidly to improve quality of our life, Also we are more interested in high sense and artistic feeling in the music and entertainment areas by use of three dimensional (3D) digital sound technology continuously as well as 3D digital video technology. The service field of digital audio contents is increasing rapidly through the Internet. And the society of Internet users wants the audio contents service with better quality. Recently Internet users are not satisfying the sound quality with 2 channels stereo but seeking the high quality of sound with 5,] channels such as 3D audio of the movie films. But it might be needed proper hardware equipments for the service of 3D sound to satisfy this demand. In this paper, we expand the simple 3D audio generator developed and propose a web-based music bank by the software development of 3D audio generation player in 3D sound environment with two speakers minimizing hardware equipments, Also we believe that this study would contribute greatly to digital 3D sound service of high quality for music and entertainment mania.

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A Study on Storytelling Plan of Stereo-scopic 3D Animation the Motif for the Tourist Attractions in Local Government : Focused on cases of the Creation of Cheongdo-gun, Gyeongbuk and Nam-gu, Ulsan (지자체 관광자원을 모티브로 한 3D입체애니메이션의 스토리텔링 기획에 관한 연구: 울산 남구와 경북 청도의 제작사례를 중심으로)

  • Kong, Jiheun;Kim, Cheeyong
    • Journal of Korea Multimedia Society
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    • v.18 no.2
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    • pp.260-267
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    • 2015
  • The Ministry of Culture, Sports and Tourism has been implementing the 'Local Government 3D Contents Production Support Project' since 2010 to foster the 3D contents industry and secure high-quality 3D contents of local governments. This is part of national support for securing 3D media contents of local governments. In particular, stereo-scopic 3D animation is in the spotlight as media contents appropriate for simultaneous implementation of pleasure of narrative and high-level of presence to promote tourism resources of local governments. But existing stereo-scopic 3D animation-related studies are mostly concentrated in three dimensional effect expression for particular scenes or theater. Therefore, this study extracted elements required for storytelling planning by analyzing production cases of stereo-scopic 3D animation using tourism resources of local governments which have been recognized for a high quality of work.

Enhancing Electrical Properties of N-type Bismuth Telluride Alloys through Graphene Oxide Incorporation in Extrusion 3D Printing

  • Jinhee Bae;Seungki Jo ;Kyung Tae Kim
    • Journal of Powder Materials
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    • v.30 no.4
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    • pp.318-323
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    • 2023
  • The thermoelectric effect, which converts waste heat into electricity, holds promise as a renewable energy technology. Recently, bismuth telluride (Bi2Te3)-based alloys are being recognized as important materials for practical applications in the temperature range from room temperature to 500 K. However, conventional sintering processes impose limitations on shape-changeable and tailorable Bi2Te3 materials. To overcome these issues, three-dimensional (3D) printing (additive manufacturing) is being adopted. Although some research results have been reported, relatively few studies on 3D printed thermoelectric materials are being carried out. In this study, we utilize extrusion 3D printing to manufacture n-type Bi1.7Sb0.3Te3 (N-BST). The ink is produced without using organic binders, which could negatively influence its thermoelectric properties. Furthermore, we introduce graphene oxide (GO) at the crystal interface to enhance the electrical properties. The formed N-BST composites exhibit significantly improved electrical conductivity and a higher Seebeck coefficient as the GO content increases. Therefore, we propose that the combination of the extrusion 3D printing process (Direct Ink Writing, DIW) and the incorporation of GO into N-BST offers a convenient and effective approach for achieving higher thermoelectric efficiency.

One Idea on a Three Dimensional Measuring System Using Light Intensity Modulation

  • Fujimoto Ikumatsu;Cho In-Ho;Pak Jeong-Hyeon;Pyoun Young-Sik
    • International Journal of Control, Automation, and Systems
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    • v.3 no.1
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    • pp.130-136
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    • 2005
  • A new optical digitizing system for determining the position of a cursor in three dimensions(3D) and an experimental device for its measurement are presented. A semi-passive system using light intensity modulation, a technology that is well known in radar ranging, is employed in order to overcome precision limitations imposed by background light. This system consists of a charge-coupled device camera placed before a rotating mirror and a light-emitting diode whose intensity is modulated. Using a Fresnel pattern for light modulation, it is verified that a substantial improvement of the signal to noise ratio is realized for the background noise and that a resolution of less than a single pixel can be achieved. This opens the doorway to the realization of high precision 3D digitized measurement. We further propose that a 3D position measurement with a monocular optical system can be realized by a numerical experiment if a linear-period modulated waveform is adopted as the light-modulating one.

Development of Operational Technology and Integrated Measurement Information Management System for the Radioactivity Measurement Device (방사능 측정장치 운영 기술 및 측정정보 통합관리 시스템 개발)

  • Dong-Sik Jin;Kyeong-Ryeong Kim;Jae-Geun Lee
    • Journal of radiological science and technology
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    • v.47 no.3
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    • pp.183-195
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    • 2024
  • Additional functional upgrades to the large-area compton camera (LACC) measurement device that can provide characteristics evaluation information (nuclear species and radioactivity) and two-dimensional or three-dimensional distribution imaging information of radioactive materials existing in surface or internal of concrete structures are required in terms of work stability and efficiency in order to apply to actual decommissioning sites such as nuclear power plants or medical cyclotron facilities by using this measurement device. To this purpose, the technology that allows radiation workers to intuitively and visually check the distribution of radioactive materials in advance by matching the two-dimensional distribution imaging information of radioactive materials obtained through the LACC measurement device and visual imaging of the measurement zone (10 m × 5 m) was developed. In addition, the separate system that can automatically adjust the position (height) in units of the measurement area size (0.7 m × 0.3 m × 0.8 m) of the LACC measurement device was developed and the integrated management system for characteristics evaluation information and two-dimensional or three-dimensional distribution imaging information obtained per unit of measurement for radioactive materials was developed. These functional upgrades related to LACC measurement device can improve work efficiency and safety when measuring radioactivity of concrete structures and enable the establishment of appropriate decommissioning strategies using radioactivity measurement information for decommissioning nuclear power plants or medical cyclotron facilities.