• Journal of Ocean Engineering and Technology
• /
• v.3 no.2
• /
• pp.26-34
• /
• 1989

심해에서 사용되는 계류선의 큰 자중(self-weight)에 관련된 문제를 해결하기 위하여 케이블-부표 시스템을 이용하는 것은 매우 큰 도움이 된다. 계류선에 적절한 중간잠수부표(intermediate submerged buoys)를 붙임으로써 계류선에 발생하는 최대 장력을 줄일 수 있고, 따라서 케이블의 직경을 감소시킬 수 있다. 본 논문에서는 중간잠수부표가 부착된 케이블의 비선형 정적 방정식과 선형화된 운동방정식이 유도되고, 주파수 영역해석을 이용하여 케이블의 고유진동수와 케이블 상단에서의 장력을 구하고 그것들에 대한 중간잠수부표의 영향을 조사한다.

• Journal of Korean Society for Geospatial Information Science
• /
• v.7 no.1 s.13
• /
• pp.41-52
• /
• 1999

In order to correct mismatches between neighboring digital maps, the middle line method has been widely used. However, it may result in not only a corruption of the topological consistency between the objects near to boundaries but also degeneration of accuracy. In this paper, we propose two edge-matching methods to overcome the problem of the middle line method. The first method is based on the rubber sheeting, which performs an elastic transformation for the objects located around the boundaries. The second method transforms the geometry of objects by the function of the distance from the boundary. These methods have important advantages that they preserve the topology of the original maps and improve tile accuracy, compared with the previous methods.

• Journal of KIISE:Computer Systems and Theory
• /
• v.36 no.4
• /
• pp.311-325
• /
• 2009

This paper presents a method for analyzing Hangul glyphs with their outline fonts and obtaining intermediate fonts with two different fonts. The glyphs are represented and analyzed hierarchically such as characters, components(letters) and strokes. With the analysis results, we obtain several intermediate glyphs by morphing two different glyphs of same character. For a natural glyph contour morphing, we employ the curve morphing algorithm by weighted mean of strings. In addition, we provide four operations for transformation of glyphs with different topology. As a result, it is illustrated that the proposed Hangul glyphs morphing scheme is useful for new font generation from any exist fonts or handwritings.

• Journal of Korea Society of Industrial Information Systems
• /
• v.14 no.4
• /
• pp.57-64
• /
• 2009

In this paper, We propose an highly efficient preprocessing technique for improving the performance of the crease extraction method, which can improve the accuracy of feature extraction within the fingerprint image. The proposed method applies the 1-dimensional directional slit for each pixel in fingerprint image. Once the direction of every pixel in crease candidate area is estimated, it is decomposed into different images depending on their direction. From the directional images, the crease clusters are estimated by utilizing the property of crease area. The proposed method finally extracts the crease from the crease clusters estimated from directional images.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
• /
• v.19 no.4
• /
• pp.365-372
• /
• 2001

The general rule of boundary delimitation is a the principle of equidistant. The principle of equidistant is a method that determine boundary delimitation from fixed distant of baseline or basepoint. In this paper, study Two-Point Algorithm and Three-Point Algorithm that are widely used. and developed the Boundary Delimitation Program to verify the result and error. This program is specially useful for maritime boundary delimitation problem because there is no artificial and natural object in sea to determine boundary. As a result The mid-points computed on Ellipsoid have small error rather than mid-points on plane or sphere without any distortion by map projection. Through developing boundary delimitation program, can eliminate the various manipulation error using paper map, and quickly cope with maritime boundary delimitation negotiation. Also, verify that the error of basepoint in baseline is propagate the mid-point in mid-line, and determine suitable reference plane.

• Journal of Ocean Engineering and Technology
• /
• v.3 no.2
• /
• pp.526-526
• /
• 1989

• Journal of Aerospace System Engineering
• /
• v.10 no.4
• /
• pp.35-40
• /
• 2016

Mid-course correction maneuvers (MCCMs) are necessary to correct the launch-vehicle dispersion to go to the Moon. There were 3 or 4 MCCMs needed for a direct transfer trajectory. But the strategy for MCCMs of the phasing-loop trajectory is different, because it has a longer trans-lunar trajectory than direct transfer does. An orbiter using a phasing-loop trajectory has several rotations of the Earth, so the orbiter has several good places, such as perigee and apogee, to correct the launch-vehicle dispersion. Although launch dispersion is relatively high, the launch vehicle is not as accurate as we expected. A good MCCM strategy can overcome the high dispersion by using small-magnitude correction maneuvers. This paper describes the phasing-loops sequence and strategy to correct high launch-vehicle dispersions.

• Proceedings of the Korea Multimedia Society Conference
• /
• 2003.11b
• /
• pp.533-536
• /
• 2003

자바는 썬 마이크로시스템즈사가 개발한 언어로서 현재 가장 널리 사용되는 프로그래밍 언어 중 하나이며, 컴파일러에 의해 플랫폼에 독립적인 바이트코드를 바이너리 형태로 가지고 있는 클래스 파일을 생성하면 JVM에 의해 어떠한 하드웨어나 운영체제에 상관없이 수행이 가능한 플랫폼 독립적인 언어이다. 마이크로소프트사는 .NET 플랫폼을 개발하면서 자바 언어에 대응하기 위해 C# 프로그래밍 언어를 만들었다. C#은 C/C+.의 강력함과 자바나 비주얼 베이직의 높은 생산성을 매우 효과적으로 결합한 프로그래밍 언어이다. C#은 컴파일 과정을 거치면 자바의 바이트코드와 같은 중간 언어인 MSIL코드를 갖는 파일을 출력하게 되는데, C# 이외에도 모든 .NET 언어들은 컴파일과정을 거치면서 MSIL 코드를 얻기 때문에 여러 .NET 언어들을 이용해서 하나의 응용 프로그램을 만들 수 있다. 본 논문에서는 임베디드 시스템에서의 적용을 위해 C#을 컴파일 하여 나오는 중간 언어 형태인 MSIL 코드를 자바의 중간 언어의 한 종류인 Oolong 코드로 변환해 줌으로서 C#으로 구현된 프로그램이 자바 플렛폼에서 JVM에 의해 실행되도록 하는 중간 언어 번역기를 구현하였다.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.19 no.7
• /
• pp.1203-1212
• /
• 1994

This paper proposes a variable block size vector quantization based on a biorthogonal wavelet transform for image compression. An image is first decomposed with the biorthogonal wavelet transform into multiresolution image and the wavelet coefficients of the middle frequency bands are segmented using the quadtree sturcture to extract the perceptually important regions in the middle frequency bands. A sedges of middle frequency bands exist the corresponding position of high frequency bands, the complicated quadtree structure of middle frequency bands is equally applied to the high frequency bands. Therefore the overhaed information of the quadtree codes needed to segment the high frequency bands can be reduced. The segmented subblocks are encoded with the codebook designed at the each scales and directions. The simulation results showed that the proposed methods could reproduce higher quality image with bit rate reduced about 20(%) than of the preceding VQ method and sufficiently reduce the bolck effect and the edge degradation.

• Journal of the Korea Society of Computer and Information
• /
• v.19 no.8
• /
• pp.107-117
• /
• 2014

This paper proposed the method of removing baseline drift by eliminating local maxima such as P, R, T-wave signal region and local minima Q, S-wave signal region. We applied morphology-pair operations improved from morphology operation to the ECG signal. To eliminate overshoot in the result of morphology-pair operation, we apply median value operation to the result of morphology-pair operation. We use MIT/BIH database to estimate the proposed algorithm. Experiment result show that proposed algorithm removing baseline drift effectively without orignal ECG signal distortion.