• Title/Summary/Keyword: 3차원 정

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Power Coefficient and Pressure Distributions on Blade Surfaces of a Wind Turbine with Tiltable Blades by 3D Simulations (날개 틸팅형 풍력발전기의 출력과 날개 표면의 압력분포에 대한 3차원 유동 해석)

  • Jeong, Chang-Do;Bae, Hyunwoo;Sung, Jaeyong
    • Journal of the Korean Society for Geothermal and Hydrothermal Energy
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    • v.16 no.1
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    • pp.1-8
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    • 2020
  • In this study, a new shape of wind turbine with horizontal axis has been proposed. The proposed wind turbine has two pairs of 3 tiltable blades which minimizes air resistance during the reverse rotational direction. Under a given wind speed, 3D numerical simulations on tiltable blades were performed for various TSRs(tip-speed-ratios). Four cases of rotational position was considered to analyze the torque and wind power generated on the blade surfaces. The results show that the maximum wind power occurs at the TSR of 0.2. Due to the blade tilting, the wind passes through the blade without air resistance at the reverse rotational direction. The torque is mainly caused by pressure differences between the front and rear surface of the blade, and it becomes maximum when the blade is located at the azimuth angle of 330°.

Contact Print Lithography for Precise Transplantation of Three-dimensional Microstructures into a Microsystem (표면접촉 인쇄방식을 이용한 극미세 3차원 형상의 이식공정에 관한 연구)

  • Park, Sang-Hu;Jeong, Jun-Ho;Choi, Dae-Geun;Kim, Ki-Don;Altun, Ali Ozhan;Lee, Eung-Sug;Yang, Dong-Yol;Kong, Hong-Jin;Lee, Kwang-Sup
    • Journal of the Korean Society for Precision Engineering
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    • v.24 no.12
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    • pp.136-142
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    • 2007
  • Precise fabrication of three-dimensional (3D) self-standing microstructures on thin glass plates via two-photon induced polymerization (TPP) has been an important issue for innovative 3D nanodevices and microdevices. However, there are still issues remaining to be solved, such as building 3D microstructures on opaque materials via TPP and being able to implant them as functional parts onto practical systems. To settle these issues simply and effectively, we propose a contact print lithography (CPL) method using an ultraviolet (UV)-curable polymer layer. We report some of the possibilities and potential of CPL by presenting our results for transplanting 3D microstructures onto large-area substrates and also our examination of some of the effects of the process parameters on successful transplantation.

Comparison of Electrical Coupling of Monolithic 3D Inverter with MOSFET and JLFET (MOSFET와 JLFET의 3차원 인버터 전기적 상호작용의 비교)

  • Ahn, Tae-Jun;Choi, Bum Ho;Yu, Yun Seop
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2018.05a
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    • pp.173-174
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    • 2018
  • This paper compared the electrical coupling of the monolithic 3D inverter consisting of MOSFET and JLFET. In the case of both the MOSFET and the JLFET, MOSFET and JLFET have a small threshold voltage variation when the thickness of inter-layer dielectric (ILD) = 100 nm. However, when the thickness of ILD = 10 nm, the threshold voltage variation is larger and the JLFET is twice as much as the MOSFET.

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Production of 3D Mongyudowondo with Reinterpretation of Traditional Paintings (전통회화의 재해석을 통한 3차원 몽유도원도 제작)

  • Kim, Jong-il;Kim, Jong-chan;Cho, Seung-il;Kim, Eung-Kon;Joo, Hae-jeong;Kim, Cheeyong
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2009.05a
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    • pp.116-119
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    • 2009
  • Culture is an element of showing the quality of life as the factor that a human can become a human being. Furthermore, culture plays a role to make something new and a source for a higher value-added business. In 21C, the term of cultural contents to combine art with digital technology was derived. In this paper, we reconstruct a 3D Mongudowondo which is improved a plain appreciation into a 3D experience of traditional picture to make better user's convenience and approach. It is a device of restoration for cultural contents and a graft on virtual reality after reinterpreting 15C pictures and analyzing text and image.

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Korean Long-Term Care Insurance System and Caring Justice (노인장기요양보험제도와 돌봄 정의)

  • Choi, Hee Kyung
    • 한국사회정책
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    • v.25 no.3
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    • pp.103-130
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    • 2018
  • The study aims to analyse Korean Long-Term Care Insurance system in terms of caring justice on the premise that elder care should be included in discussions and policies of care. Caring justice means an ideal of equal sharing duties and rights of care by all citizens. Four dimensions of caring justice(decommodification, defamilialization, degenderization and elderly participation and power) were established for the analysis. The results of the analysis were presented that Korean Long-Term Care Insurance system was maintained by commodificated and gendered care services attempting defamilialization with the exclusion of elderly beneficiaries, which represented typical caring injustice. Policy suggestions were made to realize caring justice: improving the status of caring labour by achieving proper service price and public employment, reorganization of life cycle based caring system integrating children, disabled adults and elders, and developing user-centered long-term care system to guarantee participation and choice of people in caring relationships.

2D Pattern Development of Tight-fitting Bodysuit from 3D Body Scan Data for Comfortable Pressure Sensation (인체의 3차원 스캔 데이터를 이용한 밀착 바디 슈트 개발)

  • Jeong, Yeon-Hee
    • Korean Journal of Human Ecology
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    • v.15 no.3
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    • pp.481-490
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    • 2006
  • Adjusting pressure level in the construction of athletes' tight-fitting garments by reducing the elastic knit pattern is a challenging subject, which influences the performance of the wearer directly. Therefore, in this study, relationship between the reduction rates of the basic pattern obtained from 3D human scan data and resultant clothing pressure was explored to improve the fit and pressure exerted by clothing. 3D scan data were obtained using Cyberware and they were transformed into a flat pattern using software based on Runge-Kutta method. Reduction rate was examined by subjective wear test as well as objective pressure measurement. As a result, difference in the length between the original 3D body scan data and the 2D tight-fitting pattern was 0.02$\sim$0.50cm (0.05$\sim$1.06%), which was within the range of tolerable limits in making clothes. Among the five garments, the 3T-pattern was superior in terms of subjective sensation and fit. The pressure of the 3T pattern was 2$\sim$4 gf/cm2 at five locations on the body, which is almost the same or a bit higher than that of Z-pattern. In the case of tight-fitting overall garment, the reduction rate of the pattern in the wale direction is more critical to the subjective sensation than the course direction. It is recommended that the reduction grading rules of course direction should be larger than that of Ziegert for a better fit of tight-fitting garments. In the case of wale direction, however, reduction grading rule should be kept the same as suggested earlier by Ziegert (1988).

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Development of a 4D Information based Integrated Management System for Geothermal Power Plant Drilling Project (지열발전 시추프로젝트의 4D 정보화기반 통합관리 시스템 개발)

  • Lee, Seung Soo;Kim, Kwang Yeom;Shin, Hyu-Soung
    • Tunnel and Underground Space
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    • v.24 no.3
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    • pp.234-242
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    • 2014
  • Deep drilling project should be managed systematically and efficiently because it is significantly influenced by various related factors having uncertainty and high risk in terms of economy and effective management. In particular, drilling project involves participants from various sectors including necessary service company and it also needs their collaboration by sharing related information occurring at drilling process in order to secure efficient performance management. We developed 4D (3D + time) information based visualization system for progress management by combining 3D design model and predicted optimized control parameters for each section in geothermal well design. We also applied PDM (precedence diagramming method) to the system in order to setup the effective process model and hooked it up to 3D information based on precedence relation and required time for informatized process network.

A Study on the 2-D distribution of Dynamic Poisson's Ratio using 3-C Geophones (3성분 지오폰을 이용한 동포아송비의 2차원 분포 연구)

  • Hong, Myung-Ho;Hwang, Yoon-Gu;Cho, Cheol-Hee;Lee, Yoon-Jung;Kim, Ki-Young
    • 한국지구물리탐사학회:학술대회논문집
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    • 2005.05a
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    • pp.223-226
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    • 2005
  • In order to acquire 3 components data which has the good signal to noise ratio with only one shot, 3-C geophones were used, As a result, the vertical component showed the distinct first arrival of P-wave, and the horizontal component was improved the signal to noise ratio of S-wave, while was attenuated P-wave. The 2-D Poisson's ratio section was computed from P- and S-wave cell velocities included velocity tomograms of the P- and S-waves. The Poisson's ratio values were computed in the range of $0.2{\~}0.3$. With one shot, we can obtain 2-D distribution of dynamic Poisson's ratio as well as velocity tomograms of P- and S-waves.

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Development of Standard of Highway Curve Geometric Considering 3-D Acceleration (3차원 가속도를 고려한 도로곡선부 유형별 설계기준 제시)

  • Park, Jung-Ha;Park, Je-Jin;Park, Tae-Hoon;Ha, Tae-Jun
    • International Journal of Highway Engineering
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    • v.10 no.4
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    • pp.247-255
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    • 2008
  • According to "A guide Book to Highway Design", most road elements are chosen based on a certain design speed in order to ensure obtaining safe and smooth traffic operating. However, road safety in practical way is corelative to not only all element of roads but also road shape, for example, between straight line and curves line and between curved lines. Also, it is relates to alignments such as horizontal alignment, vertical alignment, and cross section. That is, the practical road design should be examined in both sides of 3 dimension and consecutiveness as the practical road is a 3-dimensional successive object. The paper presents a concept for acceleration to evaluate consistency of road considering actual road shape on 3-dimension. Acceleration of vehicle is influential to road consistency based on running state of vehicle and state of drivers. Especially, the magnitude of acceleration is a quite influential element to drivers. Based on above, the acceleration on each point 3-D road can be calculated and then displacement can be done. Computation of acceleration means total calculation on each axis.

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Sharing Ship Design Model Based on STEP methodology (STEP 방법론을 이용한 선박설계 모델의 공유)

  • Yong-Jae Shin;Soon-Hung Han
    • Journal of the Society of Naval Architects of Korea
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    • v.35 no.4
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    • pp.98-108
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    • 1998
  • Hull design data is currently prepared by a 2D CAD system and re-input to 3D CAD systems specialized for detail design or to a structural analysis system. In this paper, sharing design data among different CAD systems has been studied. Based on STEP methodology, a neutral model is generated from 2D AutoCAD drawings. To handle a geometric data of this model, the non-manifold model of ACIS is used because it can support various CAD data representation such as 2D graphic entities, 3D wireframe, 3D surface model, and solid B-Rep/CSG model. It is observed that a mon-manifold model can easily be transformed to a 3-D wireframe model for the hull detail design system AutoDef or a FE model for the structural analysis system Nastran.

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