• KSII Transactions on Internet and Information Systems (TIIS)
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• v.5 no.12
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• pp.2315-2325
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• 2011

We propose a novel reduced-state maximum-likelihood sequence detection (MLSD) structure using the Viterbi algorithm based on the second-order Volterra kernel modeling nonlinear distortion due to square law detection of multipath channels commonly occurring in chromatic dispersion (CD) or polarization mode dispersion (PMD) in optical communication systems. While all existing MLSD methods for square-law detection receivers are based on direct computation of branch metrics, the proposed algorithm provides an efficient and structured way to implement reduced-state MLSD with almost the same complexity of a MLSD for linear channels. As a result, the proposed algorithm reduces the number of parameters to be estimated and the complexity of computation.

• Proceedings of the Korean Society for Language and Information Conference
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• 2007.11a
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• pp.548-556
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• 2007

We present an automatic semantic annotation system for Korean on the EXCOM (EXploration COntextual for Multilingual) platform. The purpose of natural language processing is enabling computers to understand human language, so that they can perform more sophisticated tasks. Accordingly, current research concentrates more and more on extracting semantic information. The realization of semantic processing requires the widespread annotation of documents. However, compared to that of inflectional languages, the technology in agglutinative language processing such as Korean still has shortcomings. EXCOM identifies semantic information in Korean text using our new method, the Contextual Exploration Method. Our initial system properly annotates approximately 88% of standard Korean sentences, and this annotation rate holds across text domains.

• Proceedings of the Korean Information Science Society Conference
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• 2012.06b
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• pp.120-122
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• 2012

기존 소프트웨어 테스팅 기법은 개발자가 수동으로 테스트 케이스를 작성해야 하는 비효율성으로 인해 임베디드 소프트웨어의 안정성 확보에 어려움이 있다. Concolic 테스팅 기법은 자동으로 소프트웨어 테스트 케이스를 생성함으로써 기존 소프트웨어 테스팅 기법의 문제를 해결했지만, 임베디드 소프트웨어 테스트에 필수적인 bitwise 연산을 지원하지 않는 등의 문제가 있었다. 본 논문에서는 임베디드 소프트웨어를 위해 bitwise 연산을 지원하는 Concolic 테스팅 개선 방법에 대한 연구를 수행하고 오픈 소스 임베디드 소프트웨어 Busybox에 적용하여 기존 연구와 결과를 비교하였다. Busybox의 10개 유틸리티에 적용한 결과 기존 연구 결과 대비 평균 33%의 분기 커버리지 향상이 있었다.

• Journal of Sericultural and Entomological Science
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• v.40 no.2
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• pp.97-104
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• 1998

Mainly due to limited genetic resources available and also urgent need for hybrids suitable to local conditions, conventional theories and regular methods for bivoltine silkworm breeding are not easily applicable in such a tropical country as Sri Lanka which is recently planning to scale-up the silk industry. A simplified but practical methodology was introduced to overcome such constraints. Through application of such modified informal breeding methods, two hybrids named DP0308 and DP0314 were selected for cocoon production. Details of the altered method of germplasm improvement in the silkworm are presented, along with combining ability and heritability estimates for six parental pure lines in a half-diallel cross.

• Korean Journal of Veterinary Research
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• v.33 no.3
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• pp.555-565
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• 1993

The studies on the liver fluke of Korea have been reviewed. The fluke is Fasciola hepatica. Its intermediate host is Lymnaea biridis, whose principal habitats are rice paddies. The first fascioliasis of Korean native(beef) cattle was reported in 1915. Bovine fascioliasis is present throughout the conuntry, including north Korea, with the average prevalence of 30%. The prevalence of the disease is about the same in dairy cattle, which have been imported from other countries since 1960s. The disease was also found in Korea in other species of animals such as sheep, goats, deer of zoo and farms, and guinea pigs of a laboratory. Human fascioliasis was reported ; 35 cases by fecal examination and 11 by both parasitology and pathology. Of the latter 11 cases, 5 were ectopic parasitism. Economic loss due to the reduced carcass weight and milk production, and liver condemnation was great. Almost all flukicides developed in other countries are commercially available in Korea.

• International Journal of Aeronautical and Space Sciences
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• v.4 no.1
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• pp.19-25
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• 2003

A low speed wind tunnel test for the canard airplane model was conducted in KARI LSWT. To measure the required level of accuracy, the image system was applied for all elevator deflection and different canard incidence conditions. By doing so, the difference in aerodynamic characteristics between the forward swept and straight canards can be precisely evaluated, and the pros and cons of both canards arrangements can be discussed. Compared with both canard configurations at the same incidence angle setting, the straight canard has benefits in lift and drag, and the slope of pitching moment increases more moderately than the forward swept canard. The listed data and discussion would be useful to whom wants to design a canard airplane.

• Journal of the Korea Institute of Building Construction
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• v.13 no.1
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• pp.1-9
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• 2013

There has recently been a great deal of research into the appropriate building materials for eco-friendly construction. In the field of earth architecture, there have been walls made of pure earth or with rammed earth including a small amount of cement. The purpose of the study is to investigate the possibility increasing compressive strength through a more eco-friendly composition by using Hwangtoh binder rather than cement to increase the strength performance of rammed earth. It was found that the more the ratio of binder was increased, the more the strength was increased, but enhancement did not increase noticeably in the lower part that did not compact completely, and proper height to pour earth is 200 mm. When stone dust was added, compressive strength was lower than when adding fine aggregate and coarse aggregate, but a finer surface texture was provided.

• Proceedings of the KIEE Conference
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• 2002.07d
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• pp.2568-2571
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• 2002

A LCD backlight inverter control IC based on the piezoelectric transformer (PZT) for Cold Cathode Fluorescent Lamp (CCFL) lighting is proposed. It is indeed a variable frequency, variable duty (VFVD) controller having dual feedback control loops for achieving both the regulation of lamp current and the maximum efficiency. The PWM controller regulates the lamp current, while the PLL controller tunes the operating frequency to the frequency that the efficiency of the combined LC-PZT resonator becomes maximum. The mixed PLL/PWM control technique lets the backlight inverter operate at the maximum efficiency in spite of the variation of component and environment. The controller features include a protection for an open or broken lamps, and an open lamp regulation.

• Proceedings of the KIEE Conference
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• 1999.07e
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• pp.2256-2258
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• 1999

This paper describes preliminary discussions on spatial distribution of NO density, which is mostly contained in simulated NOx exhaust, between a wire-cylinder geometry discharge gaps by using Laser Induced Fluorescence(LIF) Spectroscopy, Spatial distribution of NO density will be measured with varying NO concentrations from 166 to 644 [ppm] and diameters of central electrode from 6 to 10mm. Pulsed Nd:YAG laser. Optical Parametric Oscillator(OPO), and Frequency Doubler are used to excite NO molecules to their excited state.

• Annual Conference on Human and Language Technology
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• 1999.10e
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• pp.150-155
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• 1999

다국어를 이용한 통계적 자연어 처리의 연구가 진행됨에 따라 병렬 말뭉치의 중요성이 대두되고 있다. 그러나 여러 가지 제약점으로 인하여 현재 이용 가능한 한국어 병렬 말뭉치가 드문 상황이다. 월드 와이드 웹 상에는 다양한 언어로 번역된 문서들이 있으며 이를 병렬 말뭉치로 구축, 활용한다면 말뭉치의 희소성으로 인한 문제를 해결할 수 있다. 본 논문에서는 웹 상에서 번역문서 후보를 추출한 다음 HTML 문서 구조를 비교하여 번역문서인지를 판별하고 문장 단위 정렬을 이용하여 병렬 말뭉치로 구축하는 방법을 제시한다.