• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2001년도 추계학술대회(한국공작기계학회)
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• pp.349-354
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• 2001

In this study, we investigated the effect of the impacting ang1e of particles, the scanning times and the stand-off distance on the surface roughness and the weight-loss rate of samples with no mask, and the wall profile and overetching of samples with different mask pattern in powder blasting of soda-lime glass. The varying parameters were the different impact angles between 50$^{\circ}$ and 90$^{\circ}$, scanning times of nozz1e up to 40 and the stand-off distances 70mm and 100mm. The widths of mask pattern were 0.2mm, 0.5mm and 1mm. The powder was alumina sharp particles, WA#600. The mass flow rate of powder during the erosion test was fixed constant at 175g/min and the blasting pressure of powder at 0.2MPa

• 대한소아치과학회지
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• 제11권1호
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• pp.57-74
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• 1984

The purpose of this descriptive in vitro study were to evaluate the enamel-resin interface of the preventive resin restoration with regard to etching patterns and resin-tag morphology by means of scanning electron microscope. The results were as follows; 1. Three basic etching patterns were appeared simultaneously in a same microscopic section, in concentration between 20-50% phosphoric acid. 2. In 35% orthorhosphoric acid group etched for 60 second, the etching pattern was most prominent and demonstrate closely interdigitated with enamel-resin interface without the evidence of microspace, and the resin tags were longest ranged from 10-15 um in length. 3. This pattern of interface could reduce the incidence of marginal leakage and 2ndary caries formation. 4, The preventive resin restoration could serve as sealing a questionable occlusal surface.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 1999년도 추계종합학술대회
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• pp.189-192
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• 1999

본 연구에서는 회전 주사 패턴에 의한 효율적인 영상 특징 기술 방법을 제안한다. 제안 방식은 영사의 주된 정보들이 중앙에 집중된다는 사실에 기반한다. 제안 방식은 영상의 색상정보와 공간 정보를 동시에 효율적으로 기술할 수 있다. 따라서 제안된 방식은 영상 검색에 있어 기존 방식에 비하여 계산량, 메모리 사용량 등을 줄일 수 있었다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1997년도 한국자동제어학술회의논문집; 한국전력공사 서울연수원; 17-18 Oct. 1997
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• pp.1306-1309
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• 1997

Fabric hand feeling is an important property used in apparel industry. This paper shows a sensing method to output a fiber whisker's stick slip vibration by scanning it on the fabric. Then the vibration waveforms are transformed to the Symmetrized Dot Pattern images. Experimental results show that SDP images of fiber whisker's stik slip is potentially useful to the detection of fabric hand feeling values.

• 생물환경조절학회지
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• 제20권2호
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• pp.63-71
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• 2011

영상처리는 정확한 오이의 형상 및 위치를 인식하기 위하여 형상인식 알고리즘에 대한 연구를 수행하였다. 다양한 오이형상을 인식하기 위한 방법으로는 신경회로망의 연상 메모리 알고리즘을 이용하여 오이의 특정형상을 인식하였다. 형상인식은 실제영상에서 오이의 형상과 위치를 판정할 수 있도록 알고리즘을 개발한 결과, 다음과 같은 결론을 얻었다. 본 알고리즘에서는 일정한 학습패턴의 수를 2개, 3개, 4개를 각각 기억시켜 샘플패턴 20개를 실험하여 연상시킨 결과, 학습패턴으로 복원된 출력패턴의 비율은 각각 65.0%, 45.0%, 12.5%로 나타났다. 이는 학습패턴의 수가 많을수록 수렴할 때, 다른 출력패턴으로 많이 검출되었다. 오이의 특정형상 검출은 $30{\times}30$간격으로 자동검출 되도록 처리하였다. 실제영상에서 자동 검출로 처리한 결과, 오이인식의 처리시간은 약 0.5~1초/1개(패턴) 빠르게 검출되었다. 또한, 다섯 개의 실제 영상에서 실험한 결과, 학습패턴에 대한 다른 출력패턴은 96~99%의 제거율을 나타내었다. 오이로 인식된 출력패턴 중에서, 오검출된 출력패턴의 비율은 0.1~4.2%를 나타내었다. 본 연구에서는 신경회로망을 이용하여 오이의 형상 및 위치를 인식할 수 있도록 알고리즘을 개발하였다. 오이의 위치측정은 실제영상에서 학습패턴과 유사한 출력패턴의 좌표를 가지고, 오이의 위치좌표를 추정할 수 있었다.

• 한국공작기계학회논문집
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• 제13권2호
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• pp.33-39
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• 2004

Sandblasting has recently been developed into a powder blasting technique for brittle materials. In this study, the machinability of $Si_3N_4$-hBN based machinable ceramics are evaluated for micro - pattern making processes using powder blasting. Material properties of the developed machinable ceramics according to the variation of h-BN contents give a good machinability to the ceramics. The effect of scanning times, the size of patterns and variation of BN contents on the erosion depth of samples without mask and samples with different mask patterns in powder blasting of $Si_3N_4$-hBN ceramics are investigated. The Parameters are the impact angle of $90^{\circ}$, the scanning times of nozzle up to 40, and the stand-off distances of 100mm The widths of masked pattern are 0.1mm 0.5mm and 1mm. The powder used is Alumina particles, WA#600. and the blasting pressure of powder is 0.2MPa. Through required experiments, the results are investigated and analyzed. As the results, the machinability of the developed ceramics increases as the BN contents in the ceramics.

• International Journal of Industrial Entomology and Biomaterials
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• 제8권1호
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• pp.33-41
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• 2004

The type of trichomes, their density and pattern of distribution on leaves of 16 genotypes of mulberry, belonging to both diploid and polyploid categories, were studied by scanning electron microscope. The present investigation was undertaken to find out the relationship of physical attributes, especially the density and trichome types with higher acceptability and better rearing performance by the silkworm Bombyx-mori L. Two types of trichomes glandular and non-glandular types were observed on both the leaf surfaces of all the mulberry genotypes studied. In general, greater densities of trichomes were observed on the abaxial surface than the adaxial surface of leaves in most of the genotypes. Distribution of glandular trichomes were more in abaxial surface and non-glandular trichomes were more in adaxial surface. Overall, distribution of glandular and non-glandular trichomes per unit area of leaf did not follow any regular pattern. When leaves of those genotypes were fed to silkworms, trichome density was found to be significantly negatively correlated with the survival of larvae i.e., effective rate of rearing, but trichome density did not influence the economic characters of rearing. As the distribution of glandular trichomes (GT) and non-glandular trichomes (NGT) did not follow any definite pattern, no relation could be established between the GT and NGT densities with silkworm rearing performance. However, the ratio of GT and NGT in a particular genotype influenced the rearing parameters, higher the ratios better the rearing performance. High GT and NGT ratio (＞1.00) was found positively significant when correlated with economic parameters viz., larval weight, single cocoon weight and single shell weight. The study is useful in screening different mulberry genotypes for their better acceptability to silk-worm and higher rearing performance at the early stage of selection without actually conducting the rearing.

• 한국음향학회지
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• 제16권1호
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• pp.47-53
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• 1997

이 논문은 원거리회의 환경에서 음성신호와 같은 광대역 신호를 다룰 수 있는 마이크로폰 어레이의 빔패턴(beam pattern)을 형성하는 효과적인 방법에 대하여 서술한다. 어레이의 변수를 반복적으로 변화시킴으로써, 측면롭의 높이를 조정하여 일정한 수준의 측면롭을 형성하며, 갱신된 측면롭을 대수적으로 찾지 않고 수치적으로 찾는 접근방법을 제안하였다. 어레이 계수나 마이크로폰 간격을 어레이변수로 사용하였으며, 마이크로폰 어레이 가시범위에 공간적으로 균일하게 입력되는 방향성잡음 또는 배경잡음을 효과적으로 줄일 수 있는 Dolph-Chebyshev형태의 최적화패턴을 형성하였다. 어레이 계수보다 마이크로폰 간격을 변화시키는 것이 광대역신호를 더 효과적으로 다룰 수 있는 최적화 패턴을 제공하는 것이 판명되었다. 또한 방향조정(scanning)상황 하에서 측면롭에 강한(robust)패턴을 형성할 수 있는 방법을 제안하였으며, 컴퓨터 실험결과를 제시하였다.

• 대한토목학회논문집
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• 제26권5D호
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• pp.869-876
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• 2006

파편형태로 출토되는 토기 문화재의 경우 신속하고 정확한 복원이 중요한 과제이다. 기존의 방법은 시행착오법으로 조합하므로 정확하지 않을 뿐만 아니라 많은 시간이 소요되어 왔다. 이를 3차원스캐닝방법으로 쉽게 모델링 할 수 있다면 조각끼리의 조합작업도 매우 효율적으로 할 수 있다. 본 연구에서는 원형(原形)의 토기를 3차원 패턴스캐닝 방법과 사진측량방법으로 모델링하였으며 파손으로 인한 각각의 토기조각을 스캐닝하고 모델링하였다. 사진측량의 영상획득을 위해 Canon EOS 1DS real size 디지털사진기를 검정하여 사용하였다. 형성된 모델의 단면간의 상관성을 분석하여 효율적으로 조합하였으며 잔차와 칼라오차맵을 통해 오차를 분석하였다. 또한 가상박물관을 위한 사용자 중심의 웹기반 3차원 시뮬레이션환경을 구축하였다.

• 한국실내디자인학회논문집
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• 제23권6호
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• pp.115-124
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• 2014

This study has carried out scanning tests in order to figure out the features of scanning search by sex of space users, with the result of which the validity of data has been estimated. In this research, the scanning patterns were set up for verifying the typology of scanning paths and then the reason for determining scanning paths and the validity of estimation method were reviewed. Since the observation features depends on sex, the analysis of visual activities for acquiring any information in a space will reveal the intention and purpose of space users. The findings by analyzing the features of scanning pattern by sex which were found at the determination of scanning patterns can be defined as the followings. First, for estimating the process of space-information search, the movement distance at each point of continuative-observation data from the angle of eye-movement has been extracted, on the ground of which the fixation and movement of eye have been defined for the establishment of scanning-cut characteristics. Second, the scanning times were estimated for the extraction of effective observation data that would be used for comparative analysis, which showed that men had more data (3,398.2/64.4%) than women (2,998.2/55.6%). This enables the acknowledgment that the scanning cut of men was relatively less, which indicates that men will acquire more information on space than women in the process of observing any space. Third, men's scanning times (58.0 times/2.02 seconds) were less than those of women (71.9 times/1.39 seconds) while the scanning time of the former was longer than that of the latter, which shows the feature that it takes longer for men than women in scanning while the scanning times of the former is less than those of the latter. Fourth, the observation features can be determined that the combination of this result with the predominance character by sex for a general viewpoint to be employed indicates that while men employ mixed-scanning for observation activities to acquire space-information spending for longer time, women, by concentrated-scanning, focus on a single point for shorter time or stay at one location for a considerably long time for space-information acquirement.