• 한국윤활학회:학술대회논문집
• /
• 한국윤활학회 2002년도 proceedings of the second asia international conference on tribology
• /
• pp.83-84
• /
• 2002

For estimation of chain-matching phenomena between normal paraffin as a solvent and straight-chain fatty acid as an additive, the density measurement of n-dodecane, n-tetradecane and n-hexadecane were carried out at oil temperature 313K and pressure up to 1.3 GPa. Their solidification pressure were easily determined by the appearance of molecular crystal, abrupt volumetric contraction and generation of heat of solidification and showed minima under the matching condition. The bulk modulus K of molecular crystal was evaluated using phase diagram. The bulk modulus showed maxima under the each matching condition. The chain matching effect on the bulk modulus beyond the scope of the interfacial phenomena are confirmed.

• 지능정보연구
• /
• 제13권4호
• /
• pp.35-44
• /
• 2007

본 논문에서는 인쇄체 숫자를 인식하기 위해 가중 원형 정합(weighted template matching) 방법을 제안한다. 원형 정합은 입력 영상 전체를 하나의 전역적인 특징으로 처리하는데 반해, 제안된 가중 원형 정합은 패턴의 특징이 나타나는 국부적인 영역에 해밍 거리(Hamming distance)의 가중치를 두어 패턴 특징을 강조하여 숫자 패턴의 인식률을 높인다. 또한 원형 정합은 영상을 이진화(binarization)할 때 발생되는 패턴의 윤곽선을 울퉁불퉁하게 만드는 랜덤 노이즈에 취약하다. 이러한 랜덤 노이즈를 제거하기 위해 본 논문에서는 체인 코드 트리밍(chain code trimming)방법을 제안한다. 체인 코드 트리밍은 패턴의 외부 윤곽선과 내부 윤곽선의 체인 코드 분석을 통해 특정 유형의 체인 코드를 제거, 교정함으로써 이루어진다. 실험에서는 기존의 원형 정합을 사용했을 때와 체인 코드 트리밍을 한 후 가중 원형 정합을 사용했을 때의 혼돈 행렬(confusion matrix)을 서로 비교한다. 실험 결과는 본 논문에서 제안한 방법에 의해 인쇄체 숫자의 인식률이 크게 향상된 것을 보인다.

• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 2000년도 제15차 학술회의논문집
• /
• pp.311-311
• /
• 2000

We propose a DP-based formulation for matching line patterns by defining a robust and stable geometric representation that is based on the conceptual organizations. Usually, the endpoint proximity and collinearity of image lines, as two main conceptual organization groups, are useful cues to match the model shape in the scene. As the endpoint proximity, we detect junctions from image lines. We then search for junction groups by using geometric constraint between the junctions. A junction chain similar to the model chain is searched in the scene, based on a local comparison. A Dynamic Programming-based search algorithm reduces the time complexity for the search of the model chain in the scene. Our system can find a reasonable matching, although there exist severely distorted objects in the scene. We demonstrate the feasibility of the DP-based matching method using both synthetic and real images.

• 지능정보연구
• /
• 제13권4호
• /
• pp.65-78
• /
• 2007

추천시스템은 개인화 서비스를 구현하는 방법 중의 하나이다. 추천시스템은 다양한 기법을 통해 구축될 수 있는데, 최근 전자상거래 분야에서 사용되는 기법들 중에서 대표적인 것이 협업필터링이다. 협업필터링은 영화나 음악 같이 명시적인 속성만으로 그 특성을 기술하는데 한계가 있는 아이템의 추천문제에 효과적으로 적용되어 왔다. 하지만, 이 기법은 희박성, 확장성 및 투명성 등의 문제점을 가지고 있는데, 본 연구에서는 희박성과 확장성 문제를 극복하는 방안으로 장르별 협업필터링 방법을 제안한다. 장르별 협업필터링 방법은 아이템을 최종적으로 추천하기 전에 아이템의 상위 카테고리, 즉 장르에 대한 정보를 활용하는 방법이다. 본 연구에서 제안하는 방법의 실용성을 보이기 위하여, 영화 추천시스템인 GenreWise_CF를 개발하여, 공개 데이터인 MovieLens Data에 적용하여 평가하였다. 실험 결과, 본 연구에서 제안한 GenreWise_CF가 전통적인 협업 필터링을 적용하여 개발한 추천시스템인 Basic_CF보다 향상된 성능을 보였다.

• Coupled systems mechanics
• /
• 제7권3호
• /
• pp.255-268
• /
• 2018

Stability of MBC1, a specific matching boundary condition, is proved for atomic simulations of a diatomic chain. The boundary condition and the Newton equations that govern the atomic dynamics form a coupled system. Energy functions that decay along with time are constructed for both the boundary with the same type atoms and the one with different type atoms. For a nonlinear chain, MBC1 is also shown stable. Numerical verifications are presented. Moreover, MBC1 is proved to be stable for a two dimensional square lattice.

• 산업기술연구
• /
• 제29권A호
• /
• pp.47-54
• /
• 2009

In this paper, we proposed hand detection and hand gesture recognition from USB camera video. Firstly, we extract hand region extraction using skin color information from a difference images. Background image is initially stored and extracted from the input images in order to reduce problems from complex backgrounds. After that, 16-directional chain code sequence is computed from the tracking of hand motion. These chain code sequences are compared with pre-trained models using DP matching. Our hand gesture recognition system can be used to control PowerPoint slides or applied to multimedia education systems. We got 92% hand region extraction accuracy and 82.5% gesture recognition accuracy, respectively.

• 한국지하수토양환경학회지:지하수토양환경
• /
• 제20권3호
• /
• pp.51-64
• /
• 2015

In the present study, we develop two history matching techniques based on Markov chain Monte Carlo method where radial basis function and Gaussian distribution generated by unconditional geostatistical simulation are employed as the random walk transition kernels. The Bayesian inverse methods for aquifer characterization as the developed models can be effectively applied to the condition even when the targeted information such as hydraulic conductivity is absent and there are transient hydraulic head records due to imposed stress at observation wells. The model which uses unconditional simulation as random walk transition kernel has advantage in that spatial statistics can be directly associated with the predictions. The model using radial basis function network shares the same advantages as the model with unconditional simulation, yet the radial basis function network based the model does not require external geostatistical techniques. Also, by employing radial basis function as transition kernel, multi-scale nested structures can be rigorously addressed. In the validations of the developed models, the overall predictabilities of both models are sound by showing high correlation coefficient between the reference and the predicted. In terms of the model performance, the model with radial basis function network has higher error reduction rate and computational efficiency than with unconditional geostatistical simulation.

• 대한의용생체공학회:학술대회논문집
• /
• 대한의용생체공학회 1996년도 춘계학술대회
• /
• pp.31-35
• /
• 1996

This paper presents a real time algorithm for monitoring of the arrythmia of ECG signal. A real time monitoring, following by detecting a QRS complex, is the most important. Using 2-dimensional time-delay coordinates which are reconstructed by the phase portrait plotting special trajectory, we detect QRS complexes. In this study, arrythmias are detected by matching the past standard template with tile present pattern when changing abruptly In order to matching with each other, we propose modified chain coding algorithm which applies vetor table consisting of eight orthonormal code(=binary code) to the phase portraits. This algorithm using logical function increases the weight if exceeding to the threshold determinded by correlation value and the distance from a straight line(y=x). Evaluating the performance of the proposed algorithm, we use standard MIT/BIH database. The results are fellowing, 1) Improve the speed of matching template than that of cross-correlation ever has been used. 2) Because the proposed algorithm is robust to varing fiducial point, it is possible to monitor the ECG signal with irregular RR interval. 3) In spite of baseline wandering owing to the low frequency noise, monitoring performance is not reduced.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 1988년도 전기.전자공학 학술대회 논문집
• /
• pp.659-661
• /
• 1988

SPM is MDC Processor for string pattern expressed in directional chain code. In this paper we consider the string pattern matching algorithm (Leve-nstein Algorithm) whitch is portion of Dynamic Programing, and propose architecture of SPM and simulate it on the R-T level to evaluate its architecture. We used the C language as the hardware description language, and developed it on the IBM PC/AT Zenix system V OS environment.

• 대한원격탐사학회:학술대회논문집
• /
• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
• /
• pp.375-377
• /
• 2003

In this study, we employ the control patches, which have been created in previous photogrammetric projects, serving for the candidates of the control points that are likely to be found in the newly taken photos by utilizing image matching technique. Among others, the successful implementation of the above idea lies in the underlying factors: (1). Predicting the control patches and projecting them onto new photos; (2). Alignment of control patches with respect to the new photos; (3). Generating the equivalent ground elements of control patches versus the new photos for the purpose of correlation; (4). Developing effective matching methods and matching strategy; (5). Refining the exterior orientation parameters. What may show significance in this work comparing to traditional aerial-triangulation chain is that whenever at least three matched control patches succeed in a single photo, it follows that single photo orientation is applicable. The experiments suggest the potential efficiency of automatic control point measurement from control patch database and photo orientation by the proposed workflow.