• Title/Summary/Keyword: 재구성 기준

Search Result 285, Processing Time 0.032 seconds

Validity of midsagittal reference planes constructed in 3D CT images (전산화단층사진을 이용한 3차원 영상에서 정중시상기준평면 설정에 관한 연구)

  • Jeon, Ye-Na;Lee, Ki-Heon;Hwang, Hyeon-Shik
    • The korean journal of orthodontics
    • /
    • v.37 no.3 s.122
    • /
    • pp.182-191
    • /
    • 2007

  • Objective: The purpose of this study was to evaluate the validity of midsagittal reference (MSR) planes constructed in maxillofacial 3D images. Methods: Maxillofacial computed tomography (CT) images were obtained in 36 normal occlusion individuals who did not have apparent facial asymmetry, and 3D images were reconstructed using a computer software. Six MSR planes (Cg-ANS-Ba, Cg-ANS-Op, Cg-PNS-Ba, Cg-PNS-OP, FH${\perp}$(Cg, Ba), FH${\perp}$(Cg, Op)) were constructed using the landmarks located in the midsagittal area of the maxillofacial structure, such as Cg, ANS, PNS, Ba and Op, and FH plane constructed with Po and Or. The six pairs of landmarks (Z, Fr, Fs, Zy, Mx, Ms), which represent right and left symmetry in the maxillofacial structure, were selected. Statistically significant differences of the right and the left measurements were examined through t-test, and the difference of the right and the left measurement was compared among the six MSR planes. Results: The distances from the right and the left landmarks in each pair to each MSR plane did not show a statistically significant difference. The reproducibility of the landmark identification was excellent. Conclusion: All the six planes constructed in this study can be used as a MSR plane in maxillofacial 3D analysis, particularly, the planes including Cg and ANS.

  • PDF KSCI

Analysis of National Control Points in Jeju Area (제주지역의 국가 기준점 정확도 분석)

  • Jung young-dong;Yang young-bo
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
    • /
    • v.23 no.3
    • /
    • pp.273-282
    • /
    • 2005

  • A rapidly developed satellite technology is used in comprehensive fields such as spatial data aquisition and applications. Especially a GPS positioning is expected to reinvigorate at the national reference system changes to ITRF (International Terrain Reference Frame). Currently the National Geographic Information Institute (NGII) issues a triangulation point coordinate by separating old and new coordinates and in the year of 2007 it will be scheduled to be changed ITRF. The triangulation point coordinate in Cheju area causes some problems due to the difference original observation and re-observation. Thus in this study a GPS observation is conducted after re-organizing geodetic network based on 1st and 2nd order triangulation in order to check the current triangulation points in Cheju area. After the GPS observation data analysis, stable points were extracted, proposed a geodetic network and its application.

  • PDF KSCI

Accuracy Analysis on Geodetic Network in Jeju area using GPS (GPS에 의한 제주지역의 측지기준망 정확도 분석)

  • Kang, Sang-Gu;Jung, Young-Dong;Yang, Young-Bo
    • Journal of Korean Society for Geospatial Information Science
    • /
    • v.14 no.1 s.35
    • /
    • pp.65-74
    • /
    • 2006

  • A rapidly developed satellite technology is used in comprehensive fields such as spatial data aquisition and applications. Especially a GPS positioning is expected to reinvigorate at the national reference system changes to ITRF(International Terrain Reference Frame). Currently the National Geographic Information Institute(NGII) issues a triangulation point coordinate by separating old and new coordinates and in the year of 2007 it will be scheduled to be changed ITRF. The triangulation point coordinate in Cheju area causes some problems due to the difference original observation and re-observation. Thus in this study a GPS observation is conducted after re-organizing geodetic network based on 1st and 2nd order triangulation in order to check the current triangulation points in Cheju area. After the GPS observation data analysis, stable points were extracted, proposed a geodetic network and its application.

  • PDF

Comparison of the Science Curriculum of Korea and Singapore: Focus on the Chemistry (한국과 싱가포르의 과학 교육과정 비교 분석: 화학 영역을 중심으로)

  • Hong, Jeehye;Kim, Hyunjung;Hong, Hun-Gi
    • Journal of the Korean Chemical Society
    • /
    • v.65 no.5
    • /
    • pp.370-381
    • /
    • 2021

  • This study compared and analyzed the chemistry curriculum of South Korea and Singapore. The analysis revealed that Korea's achievement standards in the chemistry subject comprised knowledge and skills, whereas Singapore's achievement standards comprised knowledge, skills, values, and attitudes. The scope of knowledge and skills of the Singaporean achievement standards-wherein each element was explicitly presented-were more extensive than that of Korea. The elementary school curriculum in both countries was structured to help students qualitatively understand materials in real life, whereas the middle school content was structured such that students could understand the topic of particles. Additionally, several differences were found in specific content elements; for example, the periodic tables were included only in the Singaporean content, whereas changes in the volume of gas according to temperature and pressure were included only in the Korean content. The Singaporean academic achievement standards, integrating knowledge, skills, values, and attitudes in science curriculum, can be used as a reference for adjusting and restructuring the Korean curriculum.

  • https://doi.org/10.5012/jkcs.2021.65.5.370 인용 PDF KSCI

Real-time Face Extraction for Content-based Image Retrieval (내용기반 영상 검색을 위한 실시간 얼굴 영역 추출)

  • 이미숙;이성환
    • Proceedings of the Korean Society of Broadcast Engineers Conference
    • /
    • 1996.06a
    • /
    • pp.169-174
    • /
    • 1996

  • 객체 인식은 대용량의 영상 데이터를 분석, 탐색하고 재구성하기 위한 내용기반 영상 검색의 매우 중요한 분야이며, 특히 인간의 얼굴은 검색 영상 내에서 대부분 주요한 장면에 위치하고 있기 때문에 그 비중이 매우 크다. 본 논문에서는 내용기반 영상 검색을 위한 실시간 얼굴 영역 추출 방법을 제안한다. 제안된 방법에서는 다층 피라미드 구조와 간단한 형태의 머리 형판을 사용하여 얼굴의 후보 영역을 추출한 후, 보다 정확한 얼굴 영역을 추출하기 위하여 후보 영역 내에서 눈의 위치를 탐색하고, 두 눈의 위치를 기준으로 최종적인 얼굴 영역을 추출하였다. 얼굴 후보 영역 추출 단계에서는 얼굴의 형태 정보를 포함하고 있는 모자이크 형판을 사용하여 머리와 턱을 포함한 얼굴 영역을 추출하였으며, 눈 위치 추출 단계에서는 눈의 위치 정보를 사용하여 눈의 탐색 영역을 결정하고, 탐색 영역 내에서 이진 영상 형판을 사용하여 눈의 위치를 추출한 후, 눈 영역의 무게 중심을 눈의 중심 위치로 설정하였다. 마지막 얼굴 영역 추출단계에서는 두 눈의 위치를 기준으로 사각형의 영역을 얼굴 영역으로 추출하였다. 제안된 방법의 성능을 검증하기 위하여 1700장의 다양한 영상에 대하여 실험하였으며, 실험 결과 한 장의 영상에서 얼굴 영역을 추출하는데 있어서, Pentium 166Mz의 PC상에서 평균 3.2초의 처리 속도와 91.7%의 추출률을 보임으로써, 실시간 얼굴 영역 추출에 매우 효과적임을 알 수 있었다.

  • PDF

Building Corporate Information Governance to Prepare in Case of Litigation - Practical Implications of Sedona Conference Principles of Information Governance - (기업 소송에 대비한 정보거버넌스의 구축 방안 - 세도나 정보거버넌스 원칙을 중심으로 -)

  • Seol, Moon-Won
    • Journal of Korean Library and Information Science Society
    • /
    • v.46 no.4
    • /
    • pp.325-354
    • /
    • 2015

  • Corporate information has great value, but also poses great risk. Information governance is an organization's coordinated, inter-disciplinary approach to satisfying information compliance requirements and managing information risks while optimizing information value. This study aims to suggest the directions of implementing information governance in business firms based on analyses of Sedona Conference Principles of Information Governance. After analysing and reformulating the principles into control standards, and they are investigated and interpreted in terms of practicing information governance.

  • https://doi.org/10.16981/kliss.46.201512.325 인용 PDF KSCI

Analysis and Implementation of a Web Document Converter for Wireless Internet Use XHTML On Mobile Communication Environment (이동통신환경에서 XHTML을 이용한 무선인터넷 문서변환기 분석 및 구현)

  • 백진영;이종옥;조성언;조경룡
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
    • /
    • 2001.10a
    • /
    • pp.105-108
    • /
    • 2001

  • This paper is purposed in design and implement of a device which can convert XHTML documents in web-Server into WML documents when users access the web by using portable devices. Users access XHTML(so-called HTML) web page and ask for informations, this document convertor recognizes of XHTML documents structures, reconstructs into simple WML documents by using