• Journal of KIISE:Computer Systems and Theory
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• v.28 no.1_2
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• pp.73-79
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• 2001

단순 다각형 P에 대한 새로운 화량문제인 경비가능충분집합(Guard Sufficiency Set:GSS)에 대하여 소개하고 정의하였다. 집합 S P가 P의 경비가능집합이라는 의미는 P의 각 점들이 최소한 S에 있는 한 점으로부터 보인다는 것을 의미한다. 집합 G P가 P의 경비가능충분집합이라는 의미는 G를 경비 가능한 임의의 집합 S P가 P 역시 경비 가능하다는 것을 의미한다. 본 논문에서는 꼭지점에 대한 GSS가 다각형 전체에 대한 GSS가 되는 다각형 부류를 제시하고, 또한 에지에 대한 GSS가 다각형 전체에 대한 GSS가 되는 다각형 부류를 제시한다. 그리고, P의 꼭지점에 대한 GSS의 크기에 대한 하한과 상한을 제시하고, 기하학적 요소에 특정 제약조건을 주어 대체 GSS을 정의할 수 있음을 보인다. 이 외에도 다양한 GSS 문제들을 소개하고, 기하학적 요소에 제약을 가한 대체 GSS를 정의하고 그와 관련된 가설을 하나 제시한다.

• Proceedings of the Korean Information Science Society Conference
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• 2006.06a
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• pp.79-81
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• 2006

커널(Kernel)을 이용한 분류 방법은 넓은 마진(large margin) 분류기로서 SVM(Support Vector Machine)을 주로 사용하게 된다 하지만, 이 방법은 라그랑제 파라미터(Lagrange Parameter)의 최적화 과정을 포함함으로써 학습 과정을 쉽지 않게 만든다. 이 최적화 과정은 특히 DNA computing과 같은 단순한 과정의 설계를 통해 결과를 얻어야 하는 새로운 계산 모델에 커널을 적용하고자 했을 경우 큰 장벽이 된다. 본 논문에서는 넓은 마진을 목표로 하는 최적화 과정이 아닌 다른 라벨(label)의 데이터간의 경계 파악을 위한 간단한 커널 갱신 방법의 도입을 통해 분류기를 설계한다. 이 방법을 가우시안 커널에 적용시켜 본 결과, 반복을 통해 데이터의 구조를 찾아갈 수 있는 특성을 보여주며, 결국 넓은 마진의 최적화된 파라미터를 찾게 됨을 보여준다. 본 논문에서는 이 최적화 방법을 DNA 분자를 이용한 커널 생성 모델인 DNA 커널에 적용시켰을 때 잘 알려진 AML/ALL 데이터를 잘 분류해 냄을 보여준다.

• Tuberculosis and Respiratory Diseases
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• v.56 no.4
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• pp.343-347
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• 2004

Congenital bronchial atresia is a rare anomaly, which results from a congenital focal obliteration of a proximal segmental or subsegmental bronchus, with normal development of the distal structures. The short atretic segment leads to the accumulation of mucus within the distal bronchi, forming a bronchocele and air trapping of the alveoli supplied by these bronchi. The diagnostic CT features include the presence of a branching opacity and the bronchocele, which radiate from the hilum and are surrounded by an area of hyperlucency.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2005.11a
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• pp.600-603
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• 2005

In this paper we studied about the effect of the double cracks on the dynamic behavior of a simply supported beam. The equation of motion is derived by using Lagrange's equation and analyzed by numerical method. The simply supported beam is modeled by the Euler-Bernoulli beam theory. The crack section is represented by a local flexibility matrix connecting three undamaged beam segments. The influences of the crack depth and position of each crack on the vibration mode and the natural frequencies of a simply supported beam are analytically clarified. The theoretical results are also validated by a comparison with experimental measurements.

• The Korean Publising Journal, Monthly
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• s.93
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• pp.8-8
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• 1991

대개의 지방출판사들이 시나 수필 등 지역문인들의 문학적 성과물을 담아내는 데 주력한다면 광주의 출판사들은 대부분이 단순한 문예물 출판이 아닌 사회의 제반모순을 들춰내는 '운동으로서의 출판'을 지향하며 다양한 방법론으로 접근하고 있는 점이 특징적이다.

• The Monthly Diabetes
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• s.197
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• pp.8-11
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• 2006

우린 간혹 처방된 식사량은 맞추려고 하지만 같은 군 안에 있는 간식으로 먹는 떡이나 고구마, 감자,빵 등의 기호 식품에는 후한 양으로 섭취하고 있지는 않은지 생각해 볼일이다. 결코 혀끝에 단맛이 느껴지는 음료나 단순당 식품에만 유독 섭취량에 철저함을 보이고 있는 것은 아닌지 생각해보자.

• Proceedings of the Korean Nuclear Society Conference
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• 2002.10a
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• pp.198.2-198
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• 2002

• Journal of Korean Society of Steel Construction
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• v.22 no.5
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• pp.477-485
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• 2010

Various monitoring sensors are used to predict and detect structural damage. Smart sensors, such as glass-fiber sensors, PZT, and MEMS, among others, have replaced traditional sensors. They are now being used in many areas. This study aims to predict the damage by measuring the PZT voltage attached on the specimen by the applied impact load. In the experiment to detect damages in beam connection, simple $H-400{\times}200{\times}8{\times}13$ beams were spliced with bolts. The results of FFT between PZT sensor and accelrometer were compared to measure the sensitivity of the PZT sensor. The damage to the beam was presumed by loosening the bolt, and then the damage measurement was accompanied. Secondly, a steel $PL600{\times}65{\times}5.8$ plate beam was fabricated for the purpose of experimenting on damage measurement. Impact loading test on three different locations was carried out. Damage width varied between 6~42mm on both sides by cutting, using a steel saw. The ratio of frequencies before and after the damage was computed to quantify the damage level by using FFT, and the change in mode pattern with the increased damage was investigated to measure the damage.

• Journal of Korean Society of Steel Construction
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• v.16 no.1 s.68
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• pp.155-167
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• 2004

In this paper, the inelastic buckling behavior of the beam under uniform bending was investigated using the energy-based method, which can tackle problems in fourth order eigenvalue. The pattern of residual stress was not available to satisfy the I-sections manufactured in Korea. however; therefore, the well-known polynomial and simplified pattern of residual stress was adopted in this study. The inelastic lateral-distortional buckling behavior of the beam with I-sections manufactured in Korea was investigated. The study was then extended to the inelastic lateral-torsional buckling of the beam by minimizing the out-of-plane web distortion. The inelastic lateral-torsional buckling results obtained in this paper were compared with the prediction of allowable bending stress given in the Korean steel designers' manual (1995). Results showed that the importance of inelastic lateral-distortional buckling did not arise for beams under uniform bending. Likewise, the design method in KSDM (1995) was proven to bo too conservative for intermediate and short spans of beams without intermediate bracing.

• Journal of Korean Society of Steel Construction
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• v.10 no.1 s.34
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• pp.25-35
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• 1998

A moment connection of H beam-to-rectangular tube column with external stiffeners was proposed. A formula to predict the ultimate strength of the connection was derived based on the yield line mechanism. Experimental investigation was performed to determine the applicability of the connection type and the strength formula. The ultimate strengths computed by the formula agreed well with the experimental values.