• 충청수학회지
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• 제34권3호
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• pp.271-283
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• 2021

The asymptotics behavior orthogonal polynomials have been in the spotlight since the result of G. Szegő in 1921. In this paper we study the pointwise asymptotics inside the unit disk for orthogonal polynomials with respect to a polynomial Szegő measure with an infinite masses points.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2003년도 ICCAS
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• pp.673-676
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• 2003

This paper deals with the problem of moving object detection and location in computer vision. We describe a new object-dependent motion analysis method for tracking target in an image sequence taken from a moving platform. We tackle these tasks with three steps. First, we make an active contour model of a target in order to build some of low-energy points, which are called kernels. Then we detect interest points in two windows called tracking windows around a kernel respectively. At the third step, we decide the correspondence of those detected interest points between tracking windows by the probabilistic relaxation method In this algorithm, the detecting process is iterative and begins with the detection of all potential correspondence pair in consecutive image. Each pair of corresponding points is then iteratively recomputed to get a globally optimum set of pairwise correspondences.

• 한국통신학회논문지
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• 제21권11호
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• pp.2776-2788
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• 1996

A new feature-based motion parameter estimation for arbitrary-shaped regions is proposed. Existing motion parameter estimation algorithms such as gradient-based algorithm require iterations that are very sensitive to initial values and which often converge to a local minimum. In this paper, the motion parameters of an object are obtained by solving a set of linear equations derived by the motion of salient feature points of the object. In order to estimate the displacement of the feature points, a new process called the "bi-directional correspondence scheme" is proposed to ensure the robjstness of correspondence. The proposed correspondence scheme iteratively selects the feature points and their corresponding points until unique one-to-one correspondence is established. Furthermore, initially obtained motion paramerters are refined using an iterative method to give a better performance. The proposed algorithm can be used for motion estimationin object-based image coder, and the experimental resuls show that the proposed method outperforms existing schemes schemes in estimating motion parameters of objects in image sequences.sequences.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2008년도 하계종합학술대회
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• pp.1013-1014
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• 2008

In this paper, we propose a new method of generating 3D face by using single frontal face image and 3D generic face model. By using active appearance model (AAM), the control points among facial feature points were localized in the 2D input face image. Then, the transform parameters of 3D generic face model were found to minimize the error between the 2D control points and the corresponding 2D points projected from 3D facial model. Finally, by using the obtained model parameters, 3D face was generated. We applied this 3D face to 3D game framework and found that the proposed method could make a realistic 3D face of game user.

• Journal of Mechanical Science and Technology
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• 제17권12호
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• pp.1961-1968
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• 2003

In this paper, an efficient numerical algorithm for the kinematic analysis of the standard MacPherson suspension system is presented. The kinematic analysis of the suspension mechanism is carried out in terms of the rectangular Cartesian coordinates of some defined points in the links and at the kinematic joints. Geometric constraints that fix the distances between the points belonging to the same rigid link are introduced. The nonlinear constraint equations are solved by iterative numerical methods. The corresponding linear equations of the velocity and acceleration are solved to yield the velocities and accelerations of the unknown points. The velocities and accelerations of other points of interest as well as the angular velocity and acceleration of any link in the mechanism can be calculated.

• Journal of Welding and Joining
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• 제23권6호
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• pp.55-60
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• 2005

In part 1. optimal process parameters such as thickness of stopper and welding time are achieved to produce high strength ISB(Inner Structured and Bonded) panels. Developed process is different from the usual resistance welding process in the number of points welded at a time. In part 2, Numerical modeling for this new process is proposed and the variation of contact area with respect to the gap of electrodes is studied through FE analyses, Besides, it is tried to figure out the welding nugget formation and proper distance between welding points. FE analytic results show that inner structures are melted more than skin plate, and current distribution between points to be welded can be controlled by distance welding points. Comparison of some FE analytic results with corresponding experimental results could confirm the validity of the proposed numerical modeling.

• 방송공학회논문지
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• 제17권2호
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• pp.305-315
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• 2012

두 카메라 혹은 다수의 카메라에서의 컬러 보정은 이후 알고리즘의 성능 향상 및 양안식 3D 카메라에서 매우 중요한 기술이다. 최근 컬러 보정 방법들이 다수 제안되었지만 이 방법들의 결과에 대한 정확한 측정 방법이 많지 않으며 기존의 측정 방법은 두 영상이 카메라의 위치에 따른 서로 다른 장면을 가지고 있을 경우 적합하지 않을 수 있다. 본 논문에서는 컬러 보정을 위한 컬러 간의 차이 측정 기법을 제안한다. 이 기법은 대상이 되는 두 영상의 장면이 일치하지 않는 경우를 고려하여 대응점 검색을 통해 두 장면간의 같은 컬러를 가져야 하는 대응점을 찾고 이 대응점 주위의 영역으로부터 통계치를 계산하여 컬러의 차이를 계산한다. 이 경우 두 영상의 위치 변화를 하나의 기하학적 변환으로 설명하는 기존 방법에서 생길 수 있는 대응점간의 불일치를 고려할 수 있다. 또한 대응점들이 영상의 모든 영역을 포함하지 않을 수 있기 때문에 전체 영상의 통계치를 계산하여 컬러의 차이를 측정한다. 최종적인 컬러의 차이는 대응점 기반과 전체 영상 기반의 컬러 차이의 가중치의 합으로 결정되며 이 가중치는 대응점 기반의 컬러 비교가 영상 내의 얼마만큼의 영역을 포함하는지에 따라서 결정된다.

• 한국콘텐츠학회논문지
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• 제17권3호
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• pp.42-52
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• 2017

파노라마 영상은 여러 시점에서 촬영한 영상들을 대응점들의 정합을 통해 합성하여 얻은 단일 영상을 말한다. 기존의 파노라마 영상 생성 방법들은 대응점들을 구할 때 각 영상에서 지역적 불변 특징점을 추출하여 서술자를 생성하고 매칭 알고리즘을 사용한다. 동영상의 경우, 프레임 수가 많아 기존의 방법으로 파노라마 영상을 생성하는 것이 상당한 시간을 소비하고 불필요한 계산을 한다. 본 논문에서는 동영상을 입력 받아 구면 파노라마 영상을 효과적으로 생성하는 기법을 제안한다. 동영상의 프레임 간의 변화가 지역적으로 크지 않으며 연속적이라는 전제 조건으로 반복성 및 계산속도가 높은 FAST 알고리즘을 사용하여 특징점들을 추출하고, Lucas-Kanade 알고리즘을 통해 각 특징점들을 추적하여 그 주변에서 대응점을 찾는다. 모든 영상에 대해서 호모그래피를 계산하면 가운데 영상을 중심으로 호모그래피를 변경하고 영상을 와핑하여 평면 파노라마 영상을 얻는다. 마지막으로 구면 좌표계 역변환식을 통해 구면 파노라마 영상을 변환하여 얻는다. 실험을 통하여 제안하는 방법이 기존의 방법들보다 파노라마 영상을 빠르고 효과적으로 생성하는 것을 확인하였다.

• East Asian mathematical journal
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• 제31권4호
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• pp.505-525
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• 2015

The purpose of this study is to analyze teaching method of addition and subtraction of whole number in Korea and New Zealand lower grade textbook and to get some suggestive points to develop mathematics curriculum and for a qualitative improvement of textbook. To do this, we will analyze focusing on teaching material, type and method of teaching, cases of real teaching and in the case of New Zealand, we will analyze portfolios together to see what kind of things do they deal with related to addition and subtraction. From these analyzing, the results are as follows: First, the guideline of accomplishment of group of year are stated in 2009 revised curriculum in Korea but it is rough. On the other hand, the level of accomplishment from kindergarten to high school are stated divided by eight kinds of thing in New Zealand curriculum. Second, there were common and different points in the aspect of teaching material. The common points are that both of our Korea and New Zealand are using materials related to real life intimately and the diifferent points are to use technology such as calculator and computer. They are more widely used in New Zealand than our Korea. Third, Korea had used routine method mainly but New Zealand had used method to develop creativity of learner such as to write problem corresponding to expression, posing problem corresponding to information, to complete table and find pattern and to write word problem to explain pattern and so on. Fourth, we could see special calculation strategies in the case of teaching addition and subtraction such as concept of double, compensation, various strategy based on counting of number, addition of the same number, magic square, near-double which are not finding in our mathematics textbook. Fifth, in the New Zealand textbook they had used teaching methods inducing curiosity of learner such as finding message and puzzle problem than solving given problem simply.

• Journal of Acupuncture Research
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• 제19권1호
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• pp.236-243
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• 2002

Objective : It is called 'Acupuncture following the four seasons', to differ the acupuncturing depth in the skin or the curing region following different seasons on the ground of heaven-person corresponding thought. The method of using five Su points is generally introduced in Yongchu or Nanjing. They only suggest the curing principles and don't mention the concrete location of the points. But definite points is shown in Maijing. Let me introduce Acupuncture following the four seasons in Maijing to you in this study. Methods : In order to study Acupuncture following the four seasons in Maijing, the first we summarise Acupuncture following the four seasons using five Su points in Yongchu and Nanjing. The second, we search for Acupuncture following the four seasons in Maijing, and analyze its contents. Results & Conclusion : According to the examination of Maijing, it succeeded to the theory of Nanjing, suggested Acupuncture following the four seasons with the method of using five Su points and acupuncture applying the principle of reinforcement and reduction. Furthermore, we know that the principle of apply not only acupuncture but also moxibustion to Acupuncture following the four seasons in Maijing.