• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.17 no.4
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• pp.321-330
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• 1999

Automation of observation and positioning of fiducial marks is made possible with the application of image matching technique, developed through the cooperative research effort of computer vision and digital photogrammetry. The major problem in such automation effort is to minimize the computing time and to increase the positional accuracy. Except for scanning and ground control surveying, the interior orientation process was automated in this study, through the development of an algorithm which applies the image matching and image processing techniques. The developed system was applied to close-range photogrammetry and the analysis of the results showed 54% improvement in processing time. For fiducial mark observation during interior orientation, the Laplacian of Gaussian transformation and the Hough transformation were applied to determine the accurate position of the center point, and the correlation matching and the least squares matching method were then applied to improve the accuracy of automated observation of fiducial marks. Image pyramid concept was applied to reduce the computing time of automated positioning of fiducial mark.

• The Journal of the Acoustical Society of Korea
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• v.31 no.7
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• pp.480-486
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• 2012

In the design of electro acoustic transducer, power factor improvement circuit is more required rather than impedance matching if the driving power amplifier has little inner resistance. Many research results have been focused on the power matching circuit designing for transferring maximum power in the wideband. There are few results in the designing study on the power factor improvement for the wide band electro acoustic transducer. In this paper, we propose a new design method on the power factor improvement for the wide band electro acoustic transducer. The proposed method consists of two steps, the chebyschev matching method and the constrained optimization, respectively.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2011.07a
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• pp.441-445
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• 2011

본 논문에서는 적외선 스테레오 카메라를 이용하여 고속으로 날아가는 표적의 좌표들을 측정하고 회귀분석을 통한 오차특성을 이용하여 추정하는 시스템을 제안한다. 표적과 배경의 온도차이로 표적 영역을 검출하고 적외선 스테레오 카메라 정합과 카메라 파라미터를 이용하여 표적의 좌표를 추정한다. 본 논문에서 제안하는 적외선 스테레오 카메라 시스템을 검증하기 위해 3차원 궤적(x,y,z) 측정기로 표적의 속도와 거리를 측정하여 표적 궤도를 예측하고, 여러 차례 실험한 비디오 데이터로부터 스테레오 정합을 이용하여 z, x축의 거리(좌표)들을 구하고 회귀 분석(regression analysis)을 사용하여 최소 자승법(Least squares method)으로 표적의 궤적들을 비교하였다. 적외선 스테레오 정합 시스템에 오차특성을 적용하여 표적의 좌표를 보정할 수 있었다. 향후 다양한 표적들의 오차를 모델화하여 고속표적들의 좌표 측정을 향상 시킬 수 있을 것으로 기대된다.

• Journal of the Korea Society of Computer and Information
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• v.12 no.6
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• pp.147-152
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• 2007

Face detection is a crucial part of the face recognition system. It determines the performance of the whole recognition system. Hausdorff distance metric has been used in face detection and recognition with good results. It defines the distance metric based only on the geometric similarity between two sets or points. However, not only the geometry but also the local patterns around the points are available in most cases. In this paper a new Hausdorff distance measure is proposed that makes hybrid use of the similarity of the geometry and the local patterns around the points. Several experiments shows that the new method outperforms the conventional method.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.38B no.12
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• pp.967-975
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• 2013

In the design of underwater electro acoustic transducer, power factor improvement circuit is more required rather than impedance matching if the driving power amplifier has little inner resistance. Many research results have been focused on the power matching circuit designing for transferring maximum power in the wideband. There are few results in the designing study on the power factor improvement for the wide band underwater electro acoustic transducer. In this paper, we set up a new design method on the power factor improvement for the wide band electro acoustic transducer, and confirm its feasibility by the experiments.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.12 no.6
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• pp.147-153
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• 2012

As IT circumstance is complicated and the scale of infra increase, a recognition of security information system and data availability are raised. At this point, a value of information assets regards important, a study of high performance backup system for disaster recovery countermeasure is a field to impact on business directly. Therefore, this study executes duplication of high performance backup system and data consistency verification. And, a performance of comparison to DB table recovery process, a transaction process speed of duplication according to network bandwidth, and performance evaluation were executed.

• Journal of the Institute of Electronics and Information Engineers
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• v.50 no.5
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• pp.253-261
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• 2013

In this paper, we study the problem of controlling composite asynchronous sequential machines. The considered asynchronous machine consists of two input/state machines in cascade connection, where the output of the front machine is delivered to the input channel of the rear machine. The objective is to design a corrective controller realizing model matching such that the stable state behavior of the closed-loop system matches that of a reference model. Since the controller receives the state feedback of the rear machine only, there exists uncertainty about the present state of the front machine. We specify the existence condition for a corrective controller given the uncertainty. The design procedure for the proposed controller is described in a case study.

• Journal of KIISE
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• v.42 no.8
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• pp.990-997
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• 2015

Panoramic image creation has been extensively studied. Existing methods use customized hardware, or apply post-processing methods to seamlessly stitch images. These result in an increase in either cost or complexity. In addition, images can only be stitched under certain conditions such as existence of characteristic points of the images. This paper proposes a low cost and easy-to-use system that produces realtime panoramic video. We use an off-the-shelf embedded platform to capture multiple images, and these are then transmitted to a server in a compressed format to be merged into a single panoramic video. Finally, we analyze the performance of the implemented system by measuring time to successfully create the panoramic image.

• Journal of the Korean Institute of Intelligent Systems
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• v.27 no.1
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• pp.59-64
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• 2017

In this paper, a controller for discrete Takagi-Sugeno(T-S) fuzzy model under imperfect premise matching is proposed. Most of previous papers have obtained the stabilization condition using common quadratic Lyapunov function. However, the stabilization condition may be conservative due to the typical disadvantage of the common quadratic Lyapunov function. Hence, in order to solve this problem, we propose the stabilization condition of discrete T-S fuzzy model using fuzzy Lyapunov function. Finally, the proposed approach is verified by the simulation experiments.

• Proceedings of the Korea Information Processing Society Conference
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• 2007.05a
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• pp.3-5
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• 2007

본 논문에서는 새로운 내용기반 이미지 검색 기법으로 식물 잎의 윤곽선에 대하여 동적 시간 정합 기법을 이용하여 유사한 이미지를 효과적으로 검색하는 방법을 제안한다. 이를 위하여 우선 식물 잎의 기준점에 대하여 잎의 가장자리를 따라 가면서 구해지는 거리의 곡선을 통하여 잎의 외형 특성을 표현하였다. 추출된 곡선 정보의 효율적인 저장과 처리를 위하여 곡선의 특성을 표현할 수 있는 퓨리에 계수(Fourier Coefficients)를 계산하고 이를 바탕으로 유사한 이미지를 계산하였다. 이런 과정에서 생기는 문제점으로는 복잡한 형태의 곡선에 대해서는 퓨리에 계수를 통하여 저장하고 복원하는 과정에서 원본 곡선의 세부적인 형태 정보를 상실하게 된다. 이러한 문제를 해결하기 위해서는 복잡한 곡선 유형에 대해서는 복원시 상실되는 정보가 최소화될 수 있는 작은 단위의 구간으로 나누고 이에 대한 퓨리에 계수를 계산하는 방법으로 다수의 퓨리에 계수 세트를 추출하는 이진 구간 분할 (Binary Range Reduction) 알고리즘을 사용하였고 질의 이미지와 저장된 이미지들을 비교하는 과정에서 검색의 정확도를 향상시키기 위하여 동적 시간 정합(Dynamic Time Warping) 알고리즘을 사용하였다. 그리고 검색의 효율을 더욱 높이기 위하여 추출된 외형 정보를 기반으로 잎의 유형을 다양한 카테고리로 분류하는 외형 기형 기반의 잎 분류 기법을 제안하였다. 다양한 실험을 통하여 제안한 기법이 식물 잎 검색에 우수한 성능을 나타냄을 보인다.