• Annual Conference on Human and Language Technology
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• 2005.10a
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• pp.112-119
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• 2005

명사구는 기본명사구와 최장명사구로 분류된다. 최장명사구에 대한 정확한 식별은 문장의 전체적인 구문구조를 파악하고 문장의 정확한 지배용언을 찾아내는데 중요한 역할을 수행한다. 본 논문에서는 확장된 청크(chunk) 개념과 다섯 개의 클래스로 세분화된 문장부호 정보를 사용한 최장명사구 식별 기법을 제안한다. 제안된 기법은 기본모델(baseline)보다 4.05% 향상된 평균 88.63%의 우수한 F-measure 성능을 보인다.

• Annual Conference on Human and Language Technology
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• 2014.10a
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• pp.161-163
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• 2014

자연어 처리를 이용한 다양한 응용 시스템에서 지식베이스는 중요한 요소이다. 지식베이스의 대표적인 예로 YAGO와 디비피디아 등이 있다. YAGO는 고성능의 지식베이스지만 한국어를 지원하지 않는다는 문제점이 있다. 그리고 디비피디아는 한국어를 지원하지만 트리플의 속성이 세분화되어 있어서 사용이 어렵다. 본 논문에서는 YAGO와 디비피디아의 트리플을 매칭하여 디비피디아 트리플의 속성을 YAGO에서 사용하는 관계명으로 변환하고 MEM을 이용해 매칭되지 않은 트리플의 속성을 자동으로 분류하는 시스템을 제안한다. 제안한 방식으로 실험한 결과 F1-Measure 79.04%의 성능을 보였다.

• Annual Conference on Human and Language Technology
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• 2014.10a
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• pp.149-152
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• 2014

자연어처리 분야에서 관계 추출은 중요한 연구 분야이다. 많은 관계 추출 연구는 지도 학습 방법을 사용하지만 정답을 구축하는 비용이 큰 문제가 있다. 본 논문에서는 distant supervision을 이용하여 데이터를 구축하고, suffix tree를 이용한 규칙기반 관계 추출 모델을 제안한다. Suffix tree를 이용한 관계추출의 Macro F1-measure는 84.05%로 관계 추출에서 사용이 가능함을 보였다.

• Journal of Sensor Science and Technology
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• v.17 no.1
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• pp.23-28
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• 2008

In order to measure bio-signals, it is desirable to build a fully implantable system which connects directly to neural pathways or body tissue. A design scheme for fully implementable measurement system is proposed in this paper. Consisting of an implanted module and an external system, the proposed scheme delivers power and data between the two modules. The external module sends power via inductive link using a simple H-bridge type oscillator. Also, the implanted module sends measured data to the external system utilizing R/F communication technique at a frequency of ISM band. A stable communication and operation is achieved as the two types of channels are separated. Implemented in a compact size enough to be implanted in human body, the system exhibits good performance in experimental studies.

• 한국신재생에너지학회:학술대회논문집
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• 2007.11a
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• pp.594-596
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• 2007

Using an oedometer cell instrumented to measure the evolution of electromagnetic properties, small strain stiffness, and temperature, we conducted consolidation tests on four types of sediments. The tested specimens include sediments with different gas hydrate saturation at four stages of loading. The test results show that the electromagnetic and mechanical properties of hydrate-bearing marine sediments are governed by the vertical effective stress, stress history, porosity, hydrate saturation, fabric, ionic concentration of the pore fluid, and temperature. The results also show that permittivity and electrical conductivity data can be combined to estimate hydrate volume fraction in laboratory sediments, methodology that might eventually be extended for estimation of hydrate concentrations in field settings.

• Environmental Sciences Bulletin of The Korean Environmental Sciences Society
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• v.10 no.S_4
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• pp.181-187
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• 2001

This study was carried out to measure the variations of potential and current density with polymers. The results were particularly examined to identify the influences on potential and rate of various factors including temperature and pH. The Tafel slope for anodic dissolution was determined by the polarization effect depending on these conditions. The optimum conditions were established for each case. The second anodic current density peak and maximum current density were designated as the relative polarization sensitivity$(I_r/I_f)$. The mass transfer coefficient value$(\alpha)$ was determined with the Tafel slope for anodic dissolution based on the polarization effect with optimum conditions.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.56 no.12
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• pp.2122-2126
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• 2007

A special PM-Tube(Photo Multiplier Tube) that is using the photoelectric effect has been designed and manufactured to measure the radiation energy of arc in a gas circuit breaker(GCB). The PM-Tube, LLG(liquid light guides), ND(neutral density) filter, and a model gas circuit breaker have been combined for the reception and the transmission of the light and a simplified synthetic test facility with the arc energy measuring system has been established. In the case of $SF_6$ gas pressure $5kg.f/cm^2$ and arc length 20mm, the radiation energy increases with the arc current but it tend to be saturated in the above 20kA. Under the arc current 20kA, the total radiation energy has the biggest value around 8kA and was not exceeded 40% of the total arc energy.

• Journal of the Korean Society of Safety
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• v.15 no.1
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• pp.43-52
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• 2000

Generally, photoelastic experimental data were measured in the closed vicinity of crack tip to determine stress intensity factors of a crack with photoelastic experiment method. In this case, only the first order term has been considered in the equation of stress field. But because it is very difficult to measure the correct photoelastic data in the closed vicinity of crack, the accuracy of experimental results was very poor. By including the high order terms in the stress field equation we could obtain the accurate S.I.F values by using clear photoelastic data in the distant region from crack tip instead of unclear photoelastic data in the vicinity of crack tip.

• Asian-Australasian Journal of Animal Sciences
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• v.13 no.7
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• pp.883-887
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• 2000

One way of evaluating the effectiveness of a dairy breeding program is to measure response to selection. This may be direct or indirect. The objectives of this study were to estimate expected progress for direct selection on milk, fat and protein yields; to estimate the expected correlated responses on indirect selection for milk, fat and protein yields in Zimbabwean Holstein cattle and to establish the effect of selection intensity on responses. The Animal Model contained fixed effects of herd, year of calving, calving month, dry period, milking frequency and additive effects pertaining to cows, sires and dams. AIREML software package was used to analyse the data. The genetic and phenotypic parameters obtained in this study were used to compute direct and correlated responses to selection. Because of the higher heritabilities in first parity, genetic progress was found to be greater when selection was practised on first parity cows as compared to later lactations. It is therefore recommended that older cows in the herd be replaced with improved heifers so as to enhance genetic progress.

• Journal of Korea Multimedia Society
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• v.18 no.3
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• pp.287-297
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• 2015

A railway security detection system is very important. There are many safety factors that directly affect the safe operation of trains. Security detection technology can be divided into passive and active approaches. In this paper, we will first survey the railway security systems and compare them. We will also propose a subway security detection system with computer vision technology, which can detect three kinds of problems: the spark problem, the obstacle problem, and the lost screw problem. The spark and obstacle detection methods are unique in our system. In our experiment using about 900 input test images, we obtained about a 99.8% performance in F- measure for the spark detection problem, and about 94.7% for the obstacle detection problem.