• 대한토목학회논문집
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• 제5권2호
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• pp.67-73
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• 1985

수치지형모형(數値地形模型)(Digital Terrain Model)을 제작(製作)하는데 있어서 보다 더 정확(正確)한 지형정보(地形情報)의 획득방법(獲得方法)이 매우 큰 비중을 차지하고 있다. 본(本) 논문(論文)은 지형정보(地形情報)를 획득(獲得)하는 방법(方法)의 하나인 밀도증가식(密度增加式) 표본추출방법(標本抽出方法)의 정확성(正確性) 분석(分析)에 그 목적(目的)을 두었다. 특히, 정확성(正確性) 분석(分析)에 있어서는 아래와 같은 사항(事項)에 대(對)해 비교분석(比較分析)하였다. - 도화기(圖化機)에 의해 작도된 종래(從來)의 등고선(等高線)(Conventional Contourlines)과 밀도증가식(密度增加式) 표본추출방법(標本抽出方法)을 이용(利用)하여 작도(作圖)한 수치등고선(數値等高線)(Digital Contourlines)과의 위치오차(位置誤差)에 대(對)한 비교분석(比較分析) - 밀도증가식(密度增加式) 표본추출방법(標本抽出方法)의 적용(適用)에 따른 보간점(補間點)에 대(對)한 표고오차(標高誤差)의 분석(分析) 위의 수치시험(數値試驗)을 위하여 등고선(等高線)의 자동작도(自動作圖)에 관한 전산(電算)프로그램을 작성(作成)했다. 시험결과(試驗結果)와 시산치(試算値)와 추출조건(抽出條件)은 정확도(正確度)와 밀접(密接)한 관계를 가지며, 특히 시산치(試算値) 1.0 m이고, 표준형(標準形)인 추출조건(抽出條件)에서는 종래(從來)의 등고선(等高線)과 거의 일치(一致)함을 알 수 있었다.

• 한국측량학회지
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• 제10권2호
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• pp.49-55
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• 1992

수피표고모형에 있어서 표고자료의 추출은 매우 중요하다. 표고의 추출은 스캐닝방법과 디지타이징 방법이 있으나 본 연구에서는 디지타이징에 대한 것이다. 연속적 추출법은 하나의 등고선을 동일한 개체로 묶는 것이며, 정규적자법은 각 격자를 대표할 수 있는 표고데이타를 직접 읽는 방법이다. 그리고 지성선을 구성하는 등고선내의 추출점을 동일의 개체로 묶는 방법이 불규칙 삼각망법이다. 연구결과에서 연속적 추출법은 입력시간이 적게 걸렸으며, 불규칙 삼각망법은 추출점의 수가 가장 적게 나타났다.

• 전자공학회논문지B
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• 제31B권9호
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• pp.142-149
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• 1994

Hangul is expressed by the basic elements, twenty-four characters. Because these characters are composed of a circle and lines, Hough transform(HT), which has a powerful performance on the noise in extracting lines, is introduced. Many difficulties often occur when the original HT is used to extract strokes and it's direction, position and length from handwritten Hangul characters. Original HT has eight direction selected as samples in the transformed image should be calculated for these eight directions. In this paper, the generalized sampling rule is suggested. According to the rule, those directions which are possible to a line are the only thing to be calculated. The experoment result turned out to be higher than the method that Chen suggested in sampling rate. Anogher experiment result is done on the 1800 handwritten Hangul characters that 10 persons wrote. By feature extracting the oritinal HT and sampling HT. And as a result of six type classification, the suggested method came out higher than original HT.

• 한국CDE학회논문집
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• 제3권1호
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• pp.15-21
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• 1998

Several adaptive and direct slicing methods have been developed to make the slice data for RP parts with better accuracy and speed. This research deals with a new adaptive slicing algorithm that shows drastic improvement in computing time for calculating the slices of a part. First, it uses less number of sampling points fur each slice in determining the thickness of the next slice. Secondly, the idea of contour map is utilized to determine the optimal sampling point on each slice. Thirdly, the calculation efficiency is further improved by introducing vertical character lines of the given part. The results in terms of accuracy and speed are compared with the existing methods.

• 대한의용생체공학회:의공학회지
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• 제9권1호
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• pp.87-92
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• 1988

In this paper, a new focusing method, to be called the pipelined sampled delay focusing (PSDF), is implemented. This method improves the lateral resolution in ultrasound imaging system. In PSDF, the analog belay lines are no longer necessary because sampling sum process can replace the conventional delay sum process. Also, the method offers continuous dynamic focusing on the resolution pixel basis, and eliminates the constraint that the maximum delay time is less than the sampling interval. Second order sampling is adopted in order to extend the sampling interval.

• 한국항행학회논문지
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• 제15권1호
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• pp.130-139
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• 2011

본 논문에서는 HIS 칼라모델에서 색상변환을 이용한 자동차 추적 알고리즘을 제안 하였다. 제안된 알고리즘은 도로위에 두 개의 수평가상 데이터 샘플라인을 설치해 놓는다. 차영상은 프레임과 프레임 사이에서 검출하였다. 검출된 자동차의 차영상에서 색상 분포를 이용해서 자동차 동일성 판별과 차선 변경을 검출하였다. 제안된 알고리즘의 효능성을 검토하기 위하여 도로에 주행하는 자동차를 대상으로 두 가상 샘플라인을 통과하는 자동차의 동일성 판별과 차선 변경을 검출하고, 자동차의 속도 측정기와 제안된 방법을 비교한 결과 0.4% 이내임을 보였다.

• 한국산업경영시스템학회:학술대회논문집
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• 한국산업경영시스템학회 2002년도 춘계학술대회
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• pp.359-364
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• 2002

In case of pn control chart often used in mass production system of plant industry and so on, we could evaluate it's performance by the approximation to normal distribution. It has many differences according to sample sizes and defective fraction, and have disadvantage that needs much samples to use the normal distribution approximation. Existent control charts can not detect the cause of process something wrong because it is taking the sampling intervals of fixed length about all times from the process. Therefore, to overcome this shortcoming we use VSI(variable sampling intervals) techniques in this paper. This technique takes a long sampling interval to have the next sampling point if the sample point is in stable state, and if the sample point is near control lines, it takes short sampling interval because the probability to escape control limit is high. To analyze performance of pn control charts that have existent fixed sampling intervals(FSI) and that use VSI technique, we compare ATS of two charts, and analyze the performance of each control chart by the sample sizes, process fraction defective and control limits that Ryan and Schwertman had proposed.

• 대한산업공학회지
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• 제8권2호
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• pp.23-31
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• 1982

A method of selecting parameters of Dodge-type continuous camping plans is proposed ; a sampling plan is designed so that its AFI curve passes through two designated points. AOQL contour lines are also drawn which can be used as a reference in choosing these points.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2002년도 춘계학술대회 논문집
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• pp.169-172
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• 2002

A vision sensor measure range data using laser light source. This sensor generally use patterned laser which shaped single line. But this vision sensor cannot satisfy new trend which feeds foster and more precise processing. The sensor's sampling rate increases as reduced image processing time. However, the sampling rate can not over 30fps, because a camera has mechanical sampling limit. If we use multi line laser pattern, we will measure multi range data in one image. In the case of using same sampling rate camera, number of 2D range data profile in one second is directly proportional to laser line's number. For example, the vision sensor using 5 laser lines can sample 150 profiles per second in best condition.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1987년도 전기.전자공학 학술대회 논문집(II)
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• pp.1235-1238
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• 1987

In this paper, a new focusing method, to be called the sampled delay focusing (SDF), is proposed. This method improves the lateral resolution in ultrasound imaging system. In SDF, the analog delay lines are no longer necessary because sampling sum process can replace the conventional delay sum process. Also, this method offers continuous dynamic focusing on the resolution pixel basis if the maximum delay time is less than the sampling interval. Second order sampling is adopted in order to extend the sampling interval.