• Title/Summary/Keyword: Digital Data

검색결과 12,048건 처리시간 0.276초

완벽한 상태정합을 이용한 지능형 디지털 재설계 (Intelligent Digital Redesign Via Complete State-Matching)

  • 김도완;주영훈;박진배
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2006년도 심포지엄 논문집 정보 및 제어부문
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    • pp.276-278
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    • 2006
  • In this paper, a complete solution to fuzzy-model-based digital redesign problem (IDR) for sampled-data nonlinear systems is presented, The term of intelligent digital redesign (IDR) is to design a digital fuzzy controller such that the sampled-data closed-loop fuzzy system is equivalent to the continuous-time closed-loop fuzzy system using the state matching, Its solution is simply obtained by linear transformation, Under the proposed sampled-data controller, the states of the sampled-data and continuous-time fuzzy system are completely matched at every sampling points.

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Dual Optical Encryption for Binary Data and Secret Key Using Phase-shifting Digital Holography

  • Jeon, Seok Hee;Gil, Sang Keun
    • Journal of the Optical Society of Korea
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    • 제16권3호
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    • pp.263-269
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    • 2012
  • In this paper, we propose a new dual optical encryption method for binary data and secret key based on 2-step phase-shifting digital holography for a cryptographic system. Schematically, the proposed optical setup contains two Mach-Zehnder type interferometers. The inner interferometer is used for encrypting the secret key with the common key, while the outer interferometer is used for encrypting the binary data with the same secret key. 2-step phase-shifting digital holograms, which result in the encrypted data, are acquired by moving the PZT mirror with phase step of 0 or ${\pi}/2$ in the reference beam path of the Mach-Zehnder type interferometer. The digital hologram with the encrypted information is a Fourier transform hologram and is recorded on CCD with 256 gray level quantized intensities. Computer experiments show the results to be encryption and decryption carried out with the proposed method. The decryption of binary secret key image and data image is performed successfully.

영상 압축을 위한 DWT Encoder 설계 (An implementation of DWT Encoder design for image compression)

  • 이강현
    • 대한전자공학회:학술대회논문집
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    • 대한전자공학회 1999년도 추계종합학술대회 논문집
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    • pp.491-494
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    • 1999
  • Introduction of digital communication network such as Integrated Services Digital Networks(ISDN) and digital storage media have rapidly developed. Due to a large amount of image data, compression is the key techniques in still image and video using digital signal processing for transmitting and storing. Digital image compression provides solutions for various image applications that represent digital image requiring a large amount of data. In this paper, the proposed DWT(Discrete Wavelet Transform) filter bank is consisted of simple architecture, but it is efficiently designed that a user obtain a wanted compression rate as only input parameter. If it is implemented by FPGA chip, the designed encoder operates in 12MHz.

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A Study on the Strategy of Resolving Impediments to Use of Digital Resources : The Case of Korean Public Libraries

  • Noh, Younghee;Wang, Dongho
    • International Journal of Knowledge Content Development & Technology
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    • 제11권3호
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    • pp.81-112
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    • 2021
  • In this study, users' perceptions and concerns about digital information resources were investigated, focusing on impediments to the use of digital resources, to devise measures for improvement by identifying factors that hinder the use of digital information resources. To achieve the purpose of the study, the research identifies the inconvenien ce factors and establishes the user inconvenience list based on prior research and the current status survey. Based on the derived list, a survey was conducted on users of public libraries. Through this study, it was found that the use of digital information resources can be enhanced by improving the internal library system. Specifically, it refers to improving search performance and accessibility of digital data, providing one-stop services for digital information resources through the operation of an integrated data management system, conducting customized user education, and establishing a digital information resource preservation system, e.g. web archiving. Also, improving the external environment and system, such as contracting with more libraries for digitized data use agreements, strengthening support, unifying the names and classifications of digital information resources, and simplifying the procedure for using digital information resources, is of great importance.

EXTRACTING OUTLINE AND ESTIMATING HEIGHT OF LAND FEATURES USING LIDAR DATA

  • Lee, Woo-Kyun;Song, Chul-Chul
    • 대한원격탐사학회:학술대회논문집
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    • 대한원격탐사학회 2006년도 Proceedings of ISRS 2006 PORSEC Volume I
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    • pp.181-183
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    • 2006
  • Digital topographic map in Korea contains layers of spatial and attribute data for 8 land features such as railroads, watercourses, roads, buildings and etc. Some of the layers such as building and forest don't include any information about height, which can be just prepared by interpretation of remote sensed data or field survey. LiDAR(Light Detection And Ranging) data using active pulse and digital camera provides data about height and form of land features. LiDAR data can be used not only to extract the outline of land features but also to estimate the height. This study presents technical availability for extraction and estimation of land feature's outline and height using LiDAR data which composes of natural and artificial land features, and digital aerial photograph which was taken simultaneously with the LiDAR. The estimated location, outline and height of land features were compared with the field survey data, and we could find that LiDAR data and digital aerial photograph can be a useful source for estimating the height of land features as well as extracting the outline.

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소셜 데이터 분석을 통한 음원 흥행 예측 지표 연구 (A Study on the Prediction Index for Chart Success of Digital Music Contents based on Analysis of Social Data)

  • 김가연;김명준
    • 디지털콘텐츠학회 논문지
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    • 제19권6호
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    • pp.1105-1114
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    • 2018
  • 최근 국내 음원 시장의 성장 속도가 두드러짐에 따라 음원 흥행 예측의 필요성이 커졌다. 본 논문에서는 인터넷 기사, SNS 등 소셜 데이터와 멜론 주간차트 진입 순위의 상관관계를 분석하여 음원 흥행의 예측 지표를 제안한다. 남자 가수와 여자 가수 각각에 대하여 총 10가지 항목의 소셜 데이터를 수집하였고, 군집 분석을 실시하였다. 이를 통해 남자 가수와 여자 가수 각각의 유의미한 음원 흥행 예측 지표를 발견하였다.

빅데이터 분석을 이용한 디지털 패션 테크에 대한 인식 연구 (Perceptions and Trends of Digital Fashion Technology - A Big Data Analysis -)

  • 송은영;임호선
    • 한국의류산업학회지
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    • 제23권3호
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    • pp.380-389
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    • 2021
  • This study aimed to reveal the perceptions and trends of digital fashion technology through an informational approach. A big data analysis was conducted after collecting the text shown in a web environment from April 2019 to April 2021. Key words were derived through text mining analysis and network analysis, and the structure of perception of digital fashion technology was identified. Using textoms, we collected 8144 texts after data refinement, conducted a frequency of emergence and central component analysis, and visualized the results with word cloud and N-gram. The frequency of appearance also generated matrices with the top 70 words, and a structural equivalent analysis was performed. The results were presented with network visualizations and dendrograms. Fashion, digital, and technology were the most frequently mentioned topics, and the frequencies of platform, digital transformation, and start-ups were also high. Through clustering, four clusters of marketing were formed using fashion, digital technology, startups, and augmented reality/virtual reality technology. Future research on startups and smart factories with technologies based on stable platforms is needed. The results of this study contribute to increasing the fashion industry's knowledge on digital fashion technology and can be used as a foundational study for the development of research on related topics.

디지털 TV 시청 행태에 부합하는 데이터 서비스 기획 가이드라인 (A Digital TV Data Service Design Guideline considering Viewer's Modality)

  • 고광일
    • 디지털콘텐츠학회 논문지
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    • 제13권1호
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    • pp.61-66
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    • 2012
  • 거실 엔터테인먼트의 핵심 플랫폼인 TV는 사용자층의 다양성과 브랜드 이미지 제고의 장점을 갖고 있기 때문에 기존 인터넷 서비스 업체들이 자사의 서비스를 디지털 TV의 데이터 서비스로 구현하여 서비스 고객의 층의 확대와 서비스 브랜드의 제고를 꾀하고 있다. 그러나 대부분의 데이터 서비스들이 시청자의 한정적인 시간을 대상으로 방송 영상 콘텐츠와 경쟁하는 구도를 취하고 있어서 성공적인 효과를 거두지 못하고 있다. 본 논문은 방송 영상 콘텐츠 시청이 TV의 주된 활용 목적인 시청자의 TV 시청 행태를 고려한 데이터 서비스의 기획 가이드라인을 제시하고 PC 기반의 인터넷 미팅 서비스를 디지털 TV로 확장하고자 하는 모 기업의 데이터 서비스를 가이드라인의 사례로 소개한다.

건설현장 3차원 점군 데이터 정합 정확성 향상을 위한 중첩비율 분석 (Analysis of overlap ratio for registration accuracy improvement of 3D point cloud data at construction sites)

  • 박수열;김석
    • 한국BIM학회 논문집
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    • 제11권4호
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    • pp.1-9
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    • 2021
  • Comparing to general scanning data, the 3D digital map for large construction sites and complex buildings consists of millions of points. The large construction site needs to be scanned multiple times by drone photogrammetry or terrestrial laser scanner (TLS) survey. The scanned point cloud data are required to be registrated with high resolution and high point density. Unlike the registration of 2D data, the matrix of translation and rotation are used for registration of 3D point cloud data. Archiving high accuracy with 3D point cloud data is not easy due to 3D Cartesian coordinate system. Therefore, in this study, iterative closest point (ICP) registration method for improve accuracy of 3D digital map was employed by different overlap ratio on 3D digital maps. This study conducted the accuracy test using different overlap ratios of two digital maps from 10% to 100%. The results of the accuracy test presented the optimal overlap ratios for an ICP registration method on digital maps.

BIM 기반 설계 자동화 도구와 디지털 트윈의 상호운용성 - 차세대 방음터널의 사례를 중심으로 - (BIM-based Design Automation Tool and Digital Twin Interoperability - Case of the Next Generation Noise Barrier Tunnel -)

  • 양승원;김성준;김성아
    • 한국BIM학회 논문집
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    • 제11권4호
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    • pp.31-41
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    • 2021
  • Digital twins between "BIM Digital Model-Physical Prototype Model" will be built for Noise Barrier tunnel(NBT) that meet the definition of N.G smart city facilities derived from previous studies to build a data flow that connects data at each stage of design, construction, and operation. In this process, BIM design automation tools are created and utilized, and consistent transmission of member and attribute data is performed by converting them into IFC format. Through this, the purpose is to improve the labor-intensive environment required from the design stage of the NBT and to consistently maintain the information required for subsequent production and construction. This includes achieving changes in the construction industry based on digital transformation by unifying various data formats used differently for each industry from design to operation. In addition, it demonstrates that information exchange in the maintenance and management stages is possible based on the data exchange of the established digital twin and aims to improve the existing labor-intensive environment and expand operability between digital and physical information. As suggested in previous studies, the implementation of digital twins in these N.G smart city facilities includes the possibility of building an environment that adds to the possibility of high value-added product platforms as well as the function of big data platforms targeting existing smart cities.