• Title, Summary, Keyword: 스캐닝영역

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A Tag Proximity Information Acquisition Scheme for RFID Yoking Proof (RFID 요킹증명을 위한 인접태그 정보 획득 기법)

  • Ham, Hyoungmin
    • The Journal of the Korea Contents Association
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    • v.19 no.9
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    • pp.476-484
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    • 2019
  • RFID yoking proof proves that a pair of tags is scanned at the same time. Since the tags scanned simultaneously by a single reader are adjacent to each other, the yoking proof is used in applications that need to check the physical proximity of tagged objects. Most of the yoking proof schemes require pre-knowledge on adjacent tags. If an error occurs in the process of collecting information about adjacent tags, all subsequent proofs will fail verification. However, there is no research that suggests specific methods for obtaining information about adjacent tags. In this study, I propose a tag proximity information acquisition scheme for a yoking proof. The proposed method consists of two steps: scanning area determination and scanning area verification. In the first step, the size and position of the area to scan tags is determined in consideration of position and transmission range of the tags. In the next step, whether tag scanning is performed within the scanning area or not is verified through reference tags of the fixed position. In analysis, I show that the determined scanning area assures acquisition of adjacent tag information and the scanning area verification detects deformation and deviation of the scanning area.

Low Power Beacon Scanning Based on Indoor Zones Transition (실내영역변화에 따른 저전력 비콘 탐지 기법)

  • Hwang, Seula;Kwon, Jinse;Lee, Jemin;Kim, Hyungshin
    • Proceedings of the Korean Society of Computer Information Conference
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    • pp.326-327
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    • 2017
  • 저전력 블루투스가 공개 된 이후 저전력 블루투스 비콘을 이용한 서비스들이 출시되고 있다. 비콘 기반 서비스는 사용자의 스마트폰이 블루투스 기능을 활성화해두었을 때, 일정한 주기의 블루투스 스캐닝을 통해 이용할 수 있다. 블루투스 비콘이 밀집된 실내 공간의 경우, 동일한 비콘이 중복 탐지되거나 사용자가 사용하지 않을 먼 거리의 비콘까지 탐지하게 되므로 스마트폰에서 불필요한 에너지 소모가 발생한다. 이러한 문제를 해결하고자 본 연구에서는 실내 구획화를 통해 동일 영역 내에서 비콘이 중복으로 탐지되는 것을 방지하는 방법과, 사용자 이동성에 따른 동적 스캐닝 주기 최적화를 통해 밀집된 실내 공간에서도 누락되는 비콘 신호를 최소로 하는 기법을 제안한다. 이러한 사용자 이동성에 기반한 스캐닝 주기 최적화 방법은 스마트폰의 전력소모량을 감소시킨다.

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Visualization of Permittivity Distribution in GFRP using Full-Field Scanning Free Space Measurement System (전영역 스캐닝 자유공간 측정 시스템을 이용한 GFRP의 유전율 분포 가시화)

  • Hyun, Jong-Min;Ahmed, Hasan;Lee, Jung-Ryul
    • Composites Research
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    • v.31 no.3
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    • pp.99-103
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    • 2018
  • This paper visualizes the full-field permittivity distribution at the standard specimens having known electromagnetic characteristics using a scanning free space measurement (SFSM) system. First, in the two Teflon specimens with different thicknesses, the real and loss tangent of permittivity could be measured and the results agreed to the theoretical and other measurement values. Then the system has been applied to Glass/epoxy and visualized different permittivity distribution depending on the material kind. Therefore, this approach will overcome the point measurement limitation of FSM and can be used for even sub-structural full-field electromagnetic evaluation of stealth and radome structures.

A Study on Correction of Airborne Laser Scanning Intensity Data (항공레이저스캐닝(ALS) 반사강도의 보정에 관한 연구)

  • Shin, Dong-June;Chang, Hoon;Choi, Nak-Hoon
    • 한국공간정보시스템학회:학술대회논문집
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    • pp.267-272
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    • 2005
  • 최근 항공레이저스캐닝(ALS)은 높은 정확도와 경제성을 이유로 지형정보를 획득하는 탁월한 수단으로 주목받고 있다. ALS에 의해 수집되는 고도자료는 DSM, DEM 제작에 유용하게 이용된다. ALS는 고도자료 이외에 지표면의 물질적 특성을 나타내는 반사강도를 획득한다. 그러나 반사강도는 노이즈로 인해 널리 이용되지 못하고 있으며, 노이즈의 주원인은 반사각으로 알려져 있다. 따라서 본 연구는 센서 위치정보와 ALS 고도자료를 이용하여 반사각을 이용하여 반사강도를 보정하는 방법을 제안하였다 여기에는 ${\theta}$의 각도로 입사한 레이저의 강도는 수직으로 입사한 레이저의 강도보다 $sin{\theta}$만큼 감소한다는 물리학적 원리가 이용되었다 반사각은 지표면과 레이저가 이루는 각으로, 센서와 측정점 사이의 각과 지표면의 경사각의 두 단계로 나누었다. 방법의 적합 여부를 확인하기 위해 적외선 영역에서 분리도가 잘 이루어지는 아스팔트, 휴경지(토양), 콘크리트, 수목의 네 가지 검증영역을 선정하여 보정된 반사강도와 보정 전의 반사강도를 비교하였다. 모든 영역에서 반사강도가 증가하였으며 특히 콘크리트와 수목에서의 증가가 두드러졌다. 보정을 통해 네 영역에서 반사강도의 분리도가 향상됨을 물론 그 크기가 '아스팔트<토양<콘크리트<수목'으로 나타나는 이론적인 경향과 유사함을 확인할 수 있다.

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An Efficient Algorithm for Mining Ranged Association Rules (영역 연관규칙 탐사를 위한 효율적 알고리즘)

  • 조일래
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.1 no.2
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    • pp.169-181
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    • 1997
  • Some association rules can have very high confidence in a sub-interval or a subrange of the domain, though not quite high confidence in the whole domain. In this paper, we define a ranged association rule, an association with high confidence worthy of special attention in a sub-domain, and further propose an efficient algorithm which finds out ranged association rules. The proposed algorithm is data-driven method in a sense that hypothetical subranges are built based on data distribution itself. In addition, to avoid redundant database scanning, we devise an effective in-memory data structure, that is collected through single database scanning. The simulation shows that the suggested algorithm has reliable performance at the acceptable time cost in actual application areas.

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Auto-focus of Optical Scanning Holographic Microscopy Using Partial Region Analysis (광 스캐닝 홀로그램 현미경에서 부분 영역 해석을 통한 자동 초점)

  • Kim, You-Seok;Kim, Tae-Geun
    • Korean Journal of Optics and Photonics
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    • v.22 no.1
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    • pp.10-15
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    • 2011
  • In this paper, we propose an auto-focusing algorithm which extracts a depth parameter by analyzing a selected part of a hologram, and we use experimental results to show that the algorithm is practical. First, we record a complex hologram using Optical Scanning Holography. Next we select some part of hologram and extract depth information through Gaussian low pass filtering, synthesizing a real-only hologram, power fringe-adjusted filtering and inverting to a new frequency axis. Finally, we reconstruct the hologram automatically using the extracted depth location.

The Ultrasonic Image Processing by Peak Value, Time Average and Depth Profile Technique in High Frequency Bandwidth (고주파대역에서 피크값, Time Average 및 Depth Profile 초음파 영상처리)

  • 이종호
    • Journal of the Korean Institute of Telematics and Electronics T
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    • v.35T no.3
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    • pp.120-127
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    • 1998
  • In this paper, ultrasonic images of 25MHz bandwidth were acquired by applying peak value variation, time average and depth profile algorithm to acoustic microscopy and its performance was compared and analysed with each other. In the time average algorithm, total reflecting pulse wave from a spot on the coin was converted to digital data in time domain and average value of the converted 512 data was calculated in computer. Time average image was displayed by gray levels colour of acquired N x N matrix average data in the scanning area on the sample. This technique having smoothing effects in time domain make developed an ultrasonic image on a highly scattering area. In depth profile technique, time difference between the reference and the reflected signal was detected with minimum resolution performance of 2ns, thus we can acquired real 3 dimensional shape of the scanning area in accordance with relative magnitude. Through these experiments, peak value, time average and depth profile images were analysed and advantages of each algorithm were proposed.

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A Study on Improvement of Halftoning using Random Space Filling Curve (무작위 공간 채움 곡선을 이용한 하프토닝의 개선 방안)

  • Jho, Cheung-Wonn
    • Journal of Digital Convergence
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    • v.12 no.1
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    • pp.415-421
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    • 2014
  • In this paper, we proposed problem and improvement of halftoning using random space filling curve. Random space filling curve is developed as a solution for shortcoming which space filling curve has self-similarity. It is used to reduce regular pattern can be occurred in constant brightness area in order that randomness apply to scanning path. But there is a problem that some area along scanning path can show too bright result in halftoning using random space filling curve. In this paper, we analyzed cause of problem and proposed single pixel error diffusion as a solution method. This method can avoid over-accumulated error and show better result in halftoning.

Creation of Three-dimensional Convergence Model for Artifact Based on Optical Surface Scanning and X-ray CT: Sam-Chongtong Hand Canon in Jinju National Museum (광학식 표면스캐닝 및 X-선 CT를 활용한 유물의 3차원 융합모델 제작: 국립진주박물관 소장 삼총통)

  • Jo, Younghoon;Kim, Dasol;Kim, Haesol;Huh, Ilkwon;Song, Mingyu
    • Conservation Science in Museum
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    • v.22
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    • pp.15-26
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    • 2019
  • This study was focused on the three-dimensional convergence modeling that can multilaterally analyze internal and external shapes of the Sam-Chongtong Hand Canon by optical precision scanning optimized for acquiring the surface shape and X-ray CT scanning used for obtaining the internal shape. First, the scanning results were converted by compatible extension, after which three-dimensional deviation analysis was conducted to verify mutual conformities. Accordingly, most (56.98%) deviations between the two scanning models was found be ±0.1mm. This result did not influence registration and merging based on the ICP algorithm. The merged data exhibited the external surface color, detailed shapes, internal width, and structure of the hand canon. The three-dimensional model based on optical surface scanning and X-ray CT scanning can be used for traditional technique interpretation as well as digital documentation of cultural heritage. In the future, it will contribute to deliver accessible scientific information of exhibits for visitors.

Application of Scanning Total Station for Efficiency Enhancement of Tunnel Surveys (터널측량의 효율성 향상을 위한 스캐닝 토털스테이션의 활용)

  • Park, Joon-Kyu;Kim, Min-Gyu
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.18 no.4
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    • pp.242-247
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    • 2017
  • Over- and under-excavation are factors that increase construction cost of tunnels, which makes management essential. Total stations have been used for tunnel surveying because GNSS is difficult to use in tunnels. However, it takes much time to acquire data using total stations. In this study, a total station was integrated with a 3D laser scanner and used for tunnel surveying in Namyangju-si, Gyeonggi-do. The scanning total station reduced the work time compared to the conventional method. Furthermore, reports were effectively generated for overbreak and underbreak for each section and compared with the design. In addition, we could analyze both the cross section and scanned area effectively by using the scanning data. This method can improve the efficiency of tunnel surveying work by combining the advantages of a conventional total station and a 3D laser scanner.