• Title, Summary, Keyword: Scanning Area

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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.

Scanning large area with a micro-electron column (마이크로 전자칼럼을 이용한 대면적 스캔)

  • Jang, Won-Kweon;Park, Seong-Soon;Kim, Ho-Seob
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.182-183
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    • 2007
  • In large area scanning with a micro-electron column, the optimal operation condition for the best visibility was studied. A micro-electron column can realize nearly unlimited scanning size with distribution of micro-electron columns, therefore applicable to large sized SEM or VSEM. The maximum scanning size with a micro-electron column was about $200cm^2$ when only one deflector was employed. However, a double deflector equipped micro-electron column provided 1.7 times larger scanning area with the same visibility as that of one deflector.

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The Optimal Condition for Scanning Large Area with a Micro-electron-column (초소형 전자칼럼의 대면적 주사 적정조건)

  • Park, Sung-Soon;Kim, Ho-Seob;Jang, Won-Kweon
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.20 no.6
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    • pp.481-486
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    • 2007
  • In large area scanning with a micro-electron-column, the operating condition for the best resolution was investigated in factors of working distance and field of view. The resolution of a test sample was dependent on electron beam energy and scanning field size. The best resolution with single deflector was obtained at 300 V and 30 mm in the electron emitting tip voltage and a working distance, respectively. The scanning area at that condition was $13.9{\times}13.9mm^2$, linearly increased with the working distance. Double deflector was employed for larger scanning size without increasing working distance, but showed only 1.7 times larger than that of single deflector, and the resolution was inverse proportional to the scanning size.

Evaluation of Scanning Methods for Target Detection (표적 검출을 위한 주사방법들의 성능평가)

  • Lee, Moon-Kyu
    • Journal of Institute of Control, Robotics and Systems
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    • v.19 no.1
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    • pp.72-79
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    • 2013
  • Different scanning methods can be used to detect targets of interest in an image. In this paper, four scanning methods, generalized raster scanning, radial scanning, corner scanning, and random scanning, are considered for the evaluation of their scanning performances. The scanning performance is defined here as the ratio of the average scanning area required to detect a single target to the whole image area. Analytic expressions for the performance of each scanning method are derived. Computational results are given to illustrate the usage and validity of the expressions for the performance comparison.

Development of Large-area Two-photon Stereolithography Process for the Fabrication of Large Three-dimensional Microstructures (대면적 3 차원 마이크로 형상제작을 위한 스테이지 스캐닝 시스템을 이용한 이광자 흡수 광조형 공정 개발)

  • Lim, Tae-Woo;Son, Yong;Yi, Shin-Wook;Kong, Hong-Jin;Park, Sang-Hu;Yang, Dong-Yol
    • Journal of the Korean Society for Precision Engineering
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    • v.25 no.1
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    • pp.122-129
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    • 2008
  • Two-photon stereolithography is recognized as a promising process for the fabrication of three-dimensional (3D) microstructures with 100 nm resolution. Generally, beam-scanning system has been used in the conventional process of two-photon stereolithography, which is limited to the fabrication of micro-prototypes in small area of several tens micrometers. For the applications to 3D high-functional micro-devices, the fabrication area of the process is required to be enlarged. In this paper, large-area two-photon stereolithography (L-TPS) employing stage scanning system has been developed. Continuous scanning method is suggested to improve the fabrication speed and parameter study is conducted. An objective lens of high numerical aperture (N.A.) and high strength material were employed in this system. Through this work, 3D microstructures of $600*600*100\;{\mu}m$ were fabricated.

Comparison between Alginate Method and 3D Whole Body Scanning in Measuring Body Surface Area (알지네이트를 이용한 체표면적 측정방법과 삼차원 스캐닝에 의한 체표면적 측정방법의 비교)

  • Lee Joo-Young;Choi Jeong-Wha
    • Journal of the Korean Society of Clothing and Textiles
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    • v.29 no.11
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    • pp.1507-1519
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    • 2005
  • The purpose of this study was to compare two methods of measuring body surface area (BSA). The BSA of Korean adults was measured using both three-dimensional (3D) scanning and an alginate method. Two males (one overweight and one lean) and one overweight female participated as subjects. The results were as follows: First, the 3D scanned BSA of all three subjects was smaller than the BSA measured using the alginate method by as much as $6-14\%$. The difference in methods was greater in the overweight participants than in the lean subject. Second, the results comparing the BSA obtained using these two methods and the BSA estimated by 10 previously developed formulas, showed that the 3D scanned BSA was the smallest among the 12 BSAs. Third, in comparing the regional differences between these two methods, the regional BSA of the lean subject (male 2) did not show any significant difference, but the overweight subjects (male 1, female 1) showed a significant difference. Forth, the biggest difference in regional BSA obtained through these two methods was in the hand, for all three subjects. The 3D scanned hand surface area was smaller than the hand surface area measured by the alginate method by as much as $24-34\%$. Fifth, in the percentage of regional BSA, there was no significant difference in these two methods. The reasons for the underestimation in the 3D scanning might be because: 1) the 3D scanner can not recognize the folding and shading of body parts, such as the finger, toe, ear, armpit, crotch and breast, 2) 3D patching and smoothing processes depend on researchers. However, the 3D scanning method is applicable to the estimation of the entire BSA, if the surface area of the hands is known, and the participant is not overweight.

The Evaluation of Architectural Density on Urban District using Airborne Laser Scanning Data (항공레이저측량 자료를 이용한 시가지 건축밀도 평가에 관한 연구)

  • Lee, Geun-Sang;Koh, Deuk-Koo;Cho, Gi-Sung
    • Journal of the Korean Association of Geographic Information Studies
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    • v.6 no.3
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    • pp.95-106
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    • 2003
  • This study evaluated the architectural density of urban district using airborne laser scanning(ALS) that is a method used in urban planning, water resources and disaster prevention with high interest recently. First, digital elevation model(DEM) and digital surface model(DSM) was constructed from Light detection and ranging(LiDAR). For getting the height of building, ZONALMEAN filter was used in DEM and ZONALMAJORITY filter was used in DSM. This study compared the floor from filtering with the floor from survey and got standard error, which is ${\pm}0.199$ floor. Also, through the overlay and statistical analysis of total-area layer and zone layer, we could present floor area ratio by zone. As a result of comparison with floor area ratio between airborne laser scanning data and survey data, the standard error of floor area ratio shows ${\pm}2.68%$. Therefore, we expect that airborne laser scanning data can be a very efficient source to decision makers who set up landuse plan in near future.

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A Study on the Estimation of Fish School Abundance Using Sonar Image (소너 화상을 이용한 어군량 추정에 관한 연구)

  • 이유원
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.39 no.2
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    • pp.92-98
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    • 2003
  • The quantification of fish school abundance was carried out by using luminance of pixel on scanning sonar image, and compared with the indices of fish school abundance e.g. school number, school area and weighted school area. The survey was carried out in Funka Bay off southern Hokkaido, Japan using research vessel Ushio-Maru during December 1999. A 180-degree scanning sonar with a frequency of 164kHz was used. The school number was counted both left and right 40-degree radial lines from the center of own vessel mark on a scanning image. The school area was measured approximately as an ellipse from the school length and width. The weighted school area was calculated by multiplying school area and average value of inner pixel luminance. A quantification of pixel luminance was also measured to integrate squared pixel luminance value on these lines. Fish school and school bottom were discriminated by the produced sonar echogram using pixel luminance value on these lines. The relationships between the quantified luminance value and other abundance indices such as school area and weighted school area revealed a good correlation. Therefore, the quantified luminance is a useful method in estimating fish school abundance in the acoustic survey using sonar.

Effect of Contact Area on Friction and Wear Behavior in Atomic Force Microscope (원자 현미경을 이용한 접촉 면적에 따른 마찰 및 마멸 특성 분석)

  • Choi Dukhyun;Hwang Woonbong
    • Journal of the Korean Society for Precision Engineering
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    • v.21 no.12
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    • pp.167-173
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    • 2004
  • Recently, it has been reported that frictional behavior at nanometer scale can be different from that at macro scale. In this article, friction and wear tests were conducted using an AFM to investigate the effect of real contact area on the coefficient of friction and wear property. SiO$_2$, Hica, and SiGe were used in friction test and the AFM tip was Si$_3$N$_4$. The real contact area between an AFM tip and flat surface was calculated by the Johnson-Kendall-Roberts (JKR) theory. Wear specimen was Mica, and the diamond tip was used. We found that the coefficient of friction is constant below a critical area, but it is degraded over the area. Moreover, it is found that wear depth increased rapidly from a certain load and was degraded as a function of the number of the scanning cycles. Also, the range of scanning velocity used in this study had little effect on the wear depth.