• 한국HCI학회:학술대회논문집
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• 2006.02a
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• pp.772-779
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• 2006

The new model proposed in this paper is the hidden Markov mesh model or the 2D HMM with the causality of top-down and left-right direction. With the addition of the causality constraint, two algorithms for the evaluation of a model and the maximum likelihood estimation of model parameters have been developed theoretically which are based on the forward-backward algorithm. It is a more natural extension of the 1D HMM than other 2D models. The proposed method will provide a useful way of modeling highly variable image patterns such as offline cursive characters.

• Journal of the Korean Data and Information Science Society
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• v.13 no.2
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• pp.157-165
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• 2002

Since 1997, when a new educational system that encourages faculties instead of departments in universities is first introduced, students have much more chance to choose and leave their majors than before. As a result, colleges of basic arts and sciences confront with a serious problem since lots of students have left their majors at the colleges. In this paper, we analyze and provide a predictive model for those students in a university using decision trees.

• Bulletin of the Korean Mathematical Society
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• v.51 no.1
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• pp.173-187
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• 2014

In this article, we introduce and study the Gorenstein cotorsion dimension of modules and rings. It is shown that this dimension has nice properties when the ring in question is left GF-closed. The relations between the Gorenstein cotorsion dimension and other homological dimensions are discussed. Finally, we give some new characterizations of weak Gorenstein global dimension of coherent rings in terms of Gorenstein cotorsion modules.

• Proceedings of the Korean Information Science Society Conference
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• 2001.10b
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• pp.508-510
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• 2001

건강과 장수에 관심이 많은 현대인에게 심장 질환은 꾸준히 증가하고 있다. 심장 질환을 측정하기 위하여 정확한 진단은 꼭 필요한 부분인데, 정확한 측정을 위해서 원하는 부분의 정확한 이미지 획득은 중요한 부분이다. 기존의 M-mode 이미지와 2자원 이미지는 각자의 장점과 단점을 가지고 있는데, 이 이미지들을 이용하여 정확한 결과를 얻기는 어려운 일이다. 본 논문에서는 기존의 두 이미지의 장점을 혼합하여 새로운 이미지를 생성하였다. 즉, Synthetic M-mode 이미지라고 불리는 새로운 좌심실 이미지는 사용자가 측정하고 싶은 부분의 이미지를 정확히 재 생성하여 보다 좋은 결과를 얻게 하고 있다.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 1996.11a
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• pp.151-159
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• 1996

본 논문에서는 right-to-left 형태의 멱승 연산에 적합한 고속 모듈라 감소 알고리듬을 제안하고 이를 여러 멱승 방식에 적용했을 경우의 계산 속도 및 메모리 사용효율을 기존의 방식들과 비교하였다. 분석 결과, 기존의 방식보다 고속으로 멱승을 수행할 수 있고 m-ary 방식이나 window 방식에서는 사용 메모리를 줄일 수 있다.

• Journal of the Korean Mathematical Society
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• v.36 no.1
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• pp.97-107
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• 1999

Given a C-dynamical system (A, G, $\alpha$) with a locally compact group G, two kinds of C-algebras are made from it, called the full C-crossed product and the reduced C-crossed product. In this paper, we extend the theory of the classical C-crossed product to the C-dynamical system (A, G, $\alpha$) with a left-cancellative semigroup M with unit. We construct a new C-algebra A $\alpha$rM, the reduced crossed product of A by the semigroup M under the action $\alpha$ and investigate some properties of A $\alpha$rM.

• International Journal of Control, Automation, and Systems
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• v.5 no.1
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• pp.93-98
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• 2007

A class of new observers in descriptor linear systems, proportional-derivative(PD) observers, are proposed. A parametric design approach for such observers is proposed based on a complete parametric solution to the generalized Sylvester matrix equation. The approach provides complete parameterizations for all the observer gains, gives the parametric expression for the corresponding left eigenvector matrix of the observer system matrix, realizes elimination of impulsive behaviors, and guarantees the regularity of the observer system.

• 한국정보디스플레이학회:학술대회논문집
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• 2008.10a
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• pp.898-899
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• 2008

In this paper we propose a new method for obtaining two way switchable LCD. For this two domain vertical alignment LCD is used. A two way LCD is able to show different images on the same screen based on left and right perspectives. Viewing angle dependence of different grey levels of transmittance for the polar angles 0, +45 and -45 degree are also found out.

• Journal of the Korean Institute of Telematics and Electronics
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• v.15 no.4
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• pp.20-25
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• 1978

Two augmented integrators are sufficient as memory elements to realize an arbitrary second-order voltage transfer funtion which has complex poles in left-half S-plane, where S is a complex variable. The augmented integrator is characterized by transfer funtion B/(S+A), where A and B are real constant.

• 제어로봇시스템학회:학술대회논문집
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• 1986.10a
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• pp.643-647
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• 1986

A new type of motor-driven Total Artificial Heart (TAH) system with rolling-ball mechanism has been developed. To test its performance as a Left Ventricular Assist Device (LVAD), LVAD is controlled to bypass blood for impaired heart triggered by the R-wave in ECG. Results of the test with a Mock Circulation System (MCS) and an animal experiment with a dog are also included. More powerful system using a brushless DC motor has been developed and its control scheme is represented.