• 한국콘텐츠학회:학술대회논문집
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• 한국콘텐츠학회 2007년도 추계 종합학술대회 논문집
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• pp.30-34
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• 2007

레이저는 단시간에 높은 정밀도로 다량의 측정을 행할 수 있는 장점을 지니며, 이의 구체적인 실현이 지상 LiDAR라고도 불리는 지상레이저 스캐너이다. 본 논문에서는 Z-F 레이저시스템을 사용하여 대상물의 3차원 레이저 측정, Point 데이터의 생성, Registration & Merging, Polygon 데이터의 생성, Surface 데이터 생성의 과정을 거쳐 수행된 고건축물의 3차원 모델링 결과에 대하여 기술한다. 문화재의 보존 및 복원을 위한 자료 기록 및 측정에 있어서 지상 레이저스캐너를 사용한 고건축물의 데이터베이스 구축기술은 문화유산의 복원 및 관련분야에 커다란 영향력으로 자리매김할 수 있을 것으로 사료된다.

• 한국정밀공학회지
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• 제23권4호
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• pp.183-190
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• 2006

Digital 3D Real Object Duplication System (RODS) consists of 3D Scanner and Solid Freeform Fabrication System (SFFS). It is a device to make three-dimensional objects directly from the drawing or the scanning data. In this research, we developed an office type SFFS based on Three Dimensional Printing Process and an industrial SFFS using Dual Laser. An office type SFFS applied sliding mode control with sliding perturbation observer (SMCSPO) algorithm for control of this system. And we measured process variables about droplet diameter measurement and powder bed formation etc. through experiments. In case of industrial type SFFS, in order to develop more elaborate and speedy system for large objects than existing SLS process, this study applies a new Selective Dual-Laser Sintering (SDLS) process and 3-axis Dynamic Focusing Scanner for scanning large area instead of the existing f lens. In this process, the temperature has a great influence on sintering of the polymer. Also the laser parameters are considered like that laser beam power, scan speed, and scan spacing. Now, this study is in progress to evaluate the effect of experimental parameters on the sintering process.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2001년도 춘계학술대회논문집C
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• pp.134-139
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• 2001

Laser scanners are widely used for reverse engineering and inspection of freeform parts in industry such as motors, electronic products, dies and molds. Due to the lack of measuring software and positioning device, the laser scanning processes have been erroneous and inconsistent. In order to automate measuring processes, an automated scan plan generation software and a proprietary hardware are developed. In this paper, an automated laser scanning system using a 3-axis motorized stage is proposed. In the scan planning step, scan directions, paths, and the number of scans are generated considering optical and mechanical parameters. In the scanning step, the generated scan plan is downloaded into the laser scanner and the motorized stage and the points on the surface are captured automatically. Finally, the point data set is analyzed to evaluate the performance of the system.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2012년도 춘계학술대회 논문집
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• pp.935-939
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• 2012

3D vibration measurement is achieved using one laser scanning vibrometer(LSV) and Laser scanner(LS) by moving the LSV to three arbitrarily locations from the principle that vibration analysis based on the frequency domain is independent of the vibration signal based on time domain. The proposed system has the same effect as using three sets of LSVs. It has an advantage of reducing equipment costs. Analytical approach of obtaining in-plane and out-of-plane vibration of surface is introduced using geometrical relations between three LSV coordinates and vibration measured at three different locations.

• 한국정밀공학회지
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• 제27권2호
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• pp.25-28
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• 2010

The micro fabrication on the mold material using picosecond laser ablation processing has been studied. We used the two kind of system with picosecond laser. First one is two mirror type scanner and telecentric f-theta lens. Second one is X-Y stage and objective lens. By using these system, the $100{\mu}m$ size chess patterning and $2{\mu}m$ size patterning was fabricated. Especially $2{\mu}m$ size patterning on the mold material can be used as the decorative rainbow color logo for industrial field. In this paper, it is proved the picosecond laser is effective tool for the laser ablation processing.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 D
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• pp.3178-3180
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• 2000

In this thesis, a controller which is appropriate for uses of scanner with small error and high speed response is proposed. Recently the application field of scanner is on increase. In case of applying to laser marking, the error of scanner has bad effect to quality. Also it can make difficulties in applying laser show that makes images, unless the high speed response is not realized. For these reasons, a controller that can adjust error and response is need. Because scanner must respond to step input that is put between a few millisecond and hundreds of microsecond with small revolution angle ranges, it is advantageous to have small inertia and large torque. First, the property of scanner is treated, and then using Op-amp and passive components and applying feedback compensation PID controller to design, the effects by controller coefficients are introduced.

• 대한치과교정학회지
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• 제50권1호
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• pp.13-25
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• 2020

Objective: The aim of this study was to compare the accuracy and reliability of measurements performed using two different software programs on digital models generated using two types of plaster model scanners (a laser scanner and a computed tomography [CT] scanner). Methods: Thirty plaster models were scanned with a 3Shape laser scanner and with a Flash CT scanner. Two examiners performed measurements on plaster models by using digital calipers and on digital models by using Ortho Analyzer (3Shape) and Digimodel^® (OrthoProof) software programs. Forty-two measurements, including tooth diameter, crown height, overjet, overbite, intercanine and intermolar distances, and sagittal relationship, were obtained. Results: Statistically significant differences were not found between the plaster and digital model measurements (ANOVA); however, some discrepancies were clinically relevant. Plaster and digital model measurements made using the two scanning methods showed high intraclass coefficient correlation values and acceptable 95% limits of agreement in the Bland-Altman analysis. The software used did not influence the accuracy of measurements. Conclusions: Digital models generated from plaster casts by using laser and CT scanning and measured using two different software programs are accurate, and the measurements are reliable. Therefore, both fabrication methods and software could be used interchangeably.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2012년도 추계학술대회 논문집
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• pp.251-252
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• 2012

• 한국산학기술학회논문지
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• 제19권11호
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• pp.744-749
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• 2018

현실 공간에 대한 정보화와 시각화 기술은 공간정보 구축을 위한 주요한 기술이며, 3차원 공간 모델링은 다양한 방법으로 측정된 데이터로부터 공간정보를 구축하는 방법으로 최근 많은 관심을 받고 있는 분야이다. 수치고도자료를 취득하는 방법은 주로 3차원 레이저 스캐너가 이용되어 왔다. 한편, 최근 4차 산업혁명의 유망기술로 주목받고 있는 무인항공기는 빠른 공간정보 취득을 위한 획기적인 기술로 평가되고 있으며, 다양한 연구가 수행되고 있다. 하지만 3차원 공간 모델링을 위한 자료구축 기술의 정량적인 작업 효율성과 데이터의 정확도에 대한 평가는 부족한 실정이다. 본 연구에서는 3차원 레이저 스캐너와 무인항공기로 취득되는 점군데이터의 특징, 작업공정, 정확도에 대한 다각적인 분석을 수행하였다. 3D 레이저 스캐너 및 무인항공기로 연구대상지의 수치고도자료를 생성하고, 분석을 통해 특징을 파악하였다. 정확도 평가를 통해 3D 레이저 스캐너 및 UAV에 의한 수치고도자료가 최대 10cm 이내의 정확도를 나타냄을 확인하였으며, 공간정보 구축에 활용이 가능함을 제시하였다. 향후, 3D 레이저 스캐너와 무인항공기에 의한 수치고도자료는 효율적인 공간정보 구축 방안으로 활용이 기대된다.

• 전기학회논문지
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• 제67권7호
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• pp.903-909
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• 2018

We propose laser scanner sensor system based walking pattern and tracking method of multiple human. This system uses laser scanners sensors and is applicable to wide and crowded area such as hospital and medical care center. The primary objective of this research is to promote the development of robust, repeatable and transferable software for security system that can automatically detect, track and follow people in public area. We developed the method of human identification for this system. Our method is following: 1. Best-walking pattern data are obtained by the help of human position and direction data obtained by laser scanners. 2. Human identification is conducted by calculating the correlation between the step length of walking human. It becomes possible to conduct human identification even in crowded scenes by estimating the movements of waling human' feet are periodic. In the experiment in the station, some effectiveness of this method became clear.