• 한국통신학회논문지
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• 제10권1호
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• pp.31-37
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• 1985

An interesting area of application which makes use of the unique features of the walsh series is that on non-linear stochastic problems. In particular, some success has been obtained in improving the efficiency of signal detection for those transducers which are essentially non-linear in operation. The set of harmonically-related nonorthogonal triangle waves is shown to form a basis apanning the same function space representable by fourier(trigonometric) series. A method for generating nonorthogonal bases for signal representation is presented tailor-made basis function can be used for specific purposes. Fundamental proofs of the basis properties of the representation are examined along with examples illustrating the techniques and computer simulation.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2007년도 하계종합학술대회 논문집
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• pp.169-170
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• 2007

In this paper, we analyze the effect of access point (AP) deployment on the accuracy of indoor localization. Two representative geometrical arrangements of AP deployment are selected. One is that a Tag is centered at the regular triangle composed of 3 AP's, and the other is that a Tag is set apart from the straight line composed of 3 AP's. As a result of simulation, the first case has a probability of 93% with distance errors within 1m, while the second case has a 32% of probability.

• 한국게임학회 논문지
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• 제4권3호
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• pp.65-70
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• 2004

모바일 기기에 대한 다양한 멀티미디어 기능의 요구로 입체감을 제공하는 3차원 그래픽 가속기의 구현이 절실한 상황이다. 하지만 다양한 멀티미디어 기능을 가져야 하는 최근의 휴대폰의 경향과 상대적으로 발전이 더딘 배터리의 문제를 생각할 때 3차원 그래픽 가속기의 저전력화는 필수적이라고 할 수 있다. 이에 본 논문에서는 내장형 3차원 그래픽 가속기 각 내부모듈별 전력소비를 측정하고 이를 내부 그래픽 처리과정과 함께 분석하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1993년도 하계학술대회 논문집 A
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• pp.489-491
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• 1993

Many optimization problem or multiple attribute, multiple alternative decision making problem may have fuzzy evaluation factors. In this case, fuzzy number operation technique is needed to evaluate and compare object functions which become fuzzy sets. Generally, fuzzy number operations can be defined by extension principle of fuzzy set theory, but it is tedious to do fuzzy number operations by using extension principle when the membership functions are defined by complex functions. Many fast methods which approximate the membership functions such as triangle, trapezoidal, or L-R type functions are proposed. In this paper, a fast fuzzy number operation method is proposed which do not simplify the membership functions of fuzzy numbers.

• 대한수학회논문집
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• 제38권2호
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• pp.431-450
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• 2023

The basic goal of quantization for probability distribution is to reduce the number of values, which is typically uncountable, describing a probability distribution to some finite set and thus to make an approximation of a continuous probability distribution by a discrete distribution. It has broad application in signal processing and data compression. In this paper, first we define the uniform distributions on different curves such as a line segment, a circle, and the boundary of an equilateral triangle. Then, we give the exact formulas to determine the optimal sets of n-means and the nth quantization errors for different values of n with respect to the uniform distributions defined on the curves. In each case, we further calculate the quantization dimension and show that it is equal to the dimension of the object; and the quantization coefficient exists as a finite positive number. This supports the well-known result of Bucklew and Wise [2], which says that for a Borel probability measure P with non-vanishing absolutely continuous part the quantization coefficient exists as a finite positive number.

• 패션비즈니스
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• 제15권3호
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• pp.22-31
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• 2011

In this study, to develop a bodice pattern for women aged 18~24 years, statistical analysis was conducted using the body measurements from 2004 Size Korea and wearing test was conducted. As a result, ease of the bust level to set a horizontal line was decided to be 4cm, that of front interscye line 0cm, and that of back interscye line 0.7~1cm. And the line which divides the horizontal baseline into halves set as the side line. The conversion formula for decision of the scye depth line in the pattern is B/6 + 3.3(cm) + ease (2.5cm), and if bust circumference is 91 or more, it should be 21cm, and if bust circumference is 76 or less, it should be 18.5cm. The back neck line width is 7cm, front neck line width 6.5cm(back neck line width -0.5cm), and front neck depth 8cm(back neck line width +1cm). The shoulder slope was set as a slope of the hypotenuse of a right-angled triangle, which went out 15cm out of the shoulder point and went down 6cm, with tan$21.7^{\circ}$. To develop a final research pattern, wearing test was performed on the primary research pattern for 21 women aged 18~24 years. As a result, the research pattern was evaluated to be significantly higher.

• 대한원격탐사학회지
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• 제22권1호
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• pp.49-61
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• 2006

The lifting scheme has been found to be a flexible method for constructing scalar wavelets with desirable properties. In this paper, it is extended to the UDAR data compression. A newly developed data compression approach to approximate the UDAR surface with a series of non-overlapping triangles has been presented. Generally a Triangulated Irregular Networks (TIN) are the most common form of digital surface model that consists of elevation values with x, y coordinates that make up triangles. But over the years the TIN data representation has become an important research topic for many researchers due its large data size. Compression of TIN is needed for efficient management of large data and good surface visualization. This approach covers following steps: First, by using a Delaunay triangulation, an efficient algorithm is developed to generate TIN, which forms the terrain from an arbitrary set of data. A new interpolation wavelet filter for TIN has been applied in two steps, namely splitting and elevation. In the splitting step, a triangle has been divided into several sub-triangles and the elevation step has been used to 'modify' the point values (point coordinates for geometry) after the splitting. Then, this data set is compressed at the desired locations by using second generation wavelets. The quality of geographical surface representation after using proposed technique is compared with the original UDAR data. The results show that this method can be used for significant reduction of data set.

• 수산해양기술연구
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• 제22권1호
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• pp.41-48
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• 1986

Ifis recommended that the injection rate should be accurate and reliable in the input data of the performance simulation in diesel engine. Matsuoka Sin improved W. Bosch's injection ratio measurement system. Matsuoka Sin reduced length of the test pipe and set the orifice. However, it was not measured accurately to measure the injection ratio due to reflection wave. In the present thesis, the improved measurement system with combination of the conventional W. Bosch type injection ratio measurement system and Matsuoka Sin type corrected W. Bosch type was practically made. The location of orifice and throttle valve was modified and set one more back pressure valve in order to reduce the effect of reflection wave. The results according to injection condition of multi-hole nozzle are following: 1. Measurement error of injection ratio measurement system in this thesis was $\pm$ 1 %, therefore, its reliability was good. 2. The form of injetion ratio is changed from trapezoidal shape to triangle shape with increase of revolution per minute when injection amount is constant. 3. In the case of constant rpm, the initial injection ratio is almost constant regardless of the amount, meanwhile the injection period becomes longer with increase of the amount. 4. The injection pressure of nozzle isn't largely influenced with injection ratio in the case of constant injection amount and rpm, otherwise the initial injection amount is increased by 3-4% when the injection pressure is low. 5. The injection ratio isn't nearly influenced with back pressure.

• 정보처리학회논문지:소프트웨어 및 데이터공학
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• 제9권1호
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• pp.11-16
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• 2020

3D 프린팅은 주목받는 신기술의 하나로 많은 관심을 받고 있다. 3D 프린팅을 하기 위해서는 먼저 3D 모델을 생성한 후, 이를 프린터가 인식할 수 있는 G-code로 변환하여야 한다. 대개 3D 모델은 페이셋이라고 하는 조그만 삼각형으로 면을 표현하는데, 모델의 크기나 정밀도에 따라 페이셋의 개수가 매우 많아져서 변환에 많은 시간이 걸리게 된다. 아파치 하둡은 대용량 데이터의 분산처리를 지원하는 프레임워크로서 그 활용 범위가 넓어지고 있다. 본 논문에서는 3D 모델을 G-code로 변환하는 작업을 효율적으로 수행하기 위해 하둡을 활용하고자 한다. 이를 위해 2단계의 분산 알고리즘을 개발하였다. 이 알고리즘은 여러 페이셋들을 먼저 Z축 값으로 정렬한 후, N등분하여 여러 노드에서 독립적으로 분산처리하도록 되어 있다. 실제 분산처리는 전처리 - 하둡의 Map - Shuffling - Reduce의 4 단계를 거쳐 구현되었다. 최종적으로 성능 평가를 위해 테스트용 3D 모델의 크기와 정밀도에 따른 처리 시간의 효율성을 보였다.

• 한국정보과학회논문지:시스템및이론
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• 제29권2호
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• pp.94-104
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• 2002

과학적 시각화인 한 분야인 등치선도 자동생성 알고리즘은 주로 규칙적인 삭가형 격자 위에서 정의된 자료에 대해서 연구를 진행되어 왔다. 하지만 기상자료 관측과 같은 실제 자료 추출 상황에서 모든 격자에서 자료를 얻는 것이 불가능하다. 자료 추출장비, 방법의 특성상 모든 격자에서 자료 값을 얻을수없다. 자료가 추출되지 않는 모든 격자에서 필요한 자료 값을 구하기 위하여 추출된 자료에 적당한 보간 법을 적용하여 근사값을 할당한다. 본 논문에서는격자형 자료를 사용하지 않고 비격자형 자료를 사용해서 등치선도를 자동으로 생성하는 알고리즘을 제안하였다. 거리가 중보간법을 이용하여 전처리된 사각형 격자형 자룔를 사용하는대신 비격자형 자료를 직접사용하여 삼각형 자료 연결으로 정의하였다. 제안된 알고리즘은 격자형 자료 연결에 근거한 등치선도를 작성한다. 이 알고리즘은 숙련된 기상도 제작자가 기상도를 작성하는 원칙에 근거를 두고 있다. 새롭게 제안된 알고리즘은 전통적이 알고리즘에 비해서 다음과 같은 장점을 갖고 있다.제안된 알고리즘은 전처리 과정에서 추출된 자료를 보간 할 필요 없이 추출된 자료만으로 등치선도를 작성한다. 그리고 격자에 보간법이 적용되었을때 발생하는 자료의 왜곡이 없다.