• 대한전자공학회논문지TC
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• 제40권10호
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• pp.79-88
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• 2003

링 구조형 광통신망에 적합한 완전 광 패킷 스위칭 시스템을 실험적으로 검증한다. 실험적 검증을 위해, 비디오 신호는 헤더와 페이로드로 구성된 광 패킷에 실리고, 완전 광 패킷 스위칭 노드에 전달된다. 전달된 광 패킷은 여러가지 완전 광 프로세서에 의해 처리되는데, 그들은 완전 팡 헤더 처리기, 패킷-레벨 클럭 추출기, 비트-레벨 클럭 추출기, 데이타 형태 변환기 등으로 구성되어 있다.

• 한국멀티미디어학회논문지
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• 제17권7호
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• pp.806-817
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• 2014

The extraction of lip region is essential to Lip Reading, which is a field of image processing to get some meaningful information by the analysis of lip movement from human face image. Many conventional methods to extract lip region are proposed. One is getting the position of lip by using geometric face structure. The other discriminates lip and skin regions by using color information only. The former is more complex than the latter, however it can analyze black and white image also. The latter is very simple compared to the former, however it is very difficult to discriminate lip and skin regions because of close similarity between these two regions. And also, the accuracy is relatively low compared to the former. Conventional analysis of color coordinate systems are mostly based on specific extraction scheme for lip regions rather than coordinate system itself. In this paper, the method for selection of effective color coordinate system and chromaticity transformation to discriminate these two lip and skin region are proposed.

• Journal of Power Electronics
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• 제16권2호
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• pp.778-785
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• 2016

An excess carrier lifetime extraction method is derived for physics-based insulated gate bipolar transistor (IGBT) models with consideration of the latest development in IGBT modeling. On the basis of the 2D mixed-mode Sentaurus simulation, the clamp turn-off test is simulated to obtain the tail current. The proposed excess carrier lifetime extraction method is then performed using the simulated data. The comparison between the extracted results and actual lifetime directly obtained from the numerical device model precisely demonstrates the accuracy of the proposed method.

• 설비공학논문집
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• 제22권10호
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• pp.719-726
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• 2010

In this paper, the appropriate thermal storage time of an air-conditioning system with slab thermal storage was considered by use of summer measurement values. Two standards of heat extraction rate and criterion function were established as the standard that evaluates appropriateness. When heat extraction rate was a standard, zero hour and seven hours were obtained as appropriate thermal storage time, in the case of evaluation by energy consumption and running cost individually. Also, when criterion function was a standard, the difference between energy consumption and running cost was small, it was because the weight function to room air temperature deviation was much bigger than heat extraction rate.

• Bulletin of the Korean Chemical Society
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• 제35권1호
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• pp.45-50
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• 2014

A fully packed capillary electrochromatographic (CEC) microchip with an on-column micro-solid phase extraction (SPE) bed for the preconcentration and separation of organic analytes was prepared. A linear microchannel with monodisperse colloidal silica packing was formed on a cyclic olefinic copolymer microchip with two reservoirs on both ends. Silver-cemented silica packing frit structure was formed at the entrance of the microchannel by electroless plating treatment as a base layer. A gold coating was formed on it by reducing $Au^{3+}$ to gold with hydroxylamine. Finally micro-SPE bed was formed by self-assembly adsorption of 1-dodecanethiol on it. Micro-SPE beds were about 100-150 ${\mu}m$ long. Approximately $10^3$ fold sensitivity enhancements for Sulforhodamine B, and Fluorescein in nM concentration levels were possible with 80 s preconcentration. Basic extraction characteristics were studied.

• 한국산업정보학회:학술대회논문집
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• 한국산업정보학회 2003년도 추계공동학술대회
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• pp.721-727
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• 2003

This study designed and implemented a system to extract of vowel from a word. The system is comprised of a voice feature extraction module and a neutral network module. The voice feature extraction module use a LPC(Linear Prediction Coefficient) model to extract a voice feature from a word. The neutral network module is comprised of a learning module and voice recognition module. The learning module sets up a learning pattern and builds up a neutral network to learn. Using the information of a learned neutral network, a voice recognition module extracts a vowel from a word. A neutral network was made to learn selected vowels(a, eo, o, e, i) to test the performance of a implemented vowel extraction recognition machine. Through this experiment, could confirm that speech recognition module extract of vowel from 4 words.

• 지능정보연구
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• 제1권2호
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• pp.57-71
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• 1995

This paper presents a rule extraction algorithm RE to acquire explicit rules from trained neural networks. The validity of extracted rules has been confirmed using 6 different data sets. Based on experimental results, we conclude that extracted rules from RE predict more accurately and robustly than neural networks themselves and rules obtained from an inductive learning algorithm do. Rule extraction algorithm for neural networks are important for incorporating knowledge obtained from trained networks into knowledge based systems. In lieu of this, the proposed RE algorithm contributes to the trend toward developing hybrid and versatile knowledge-based system including expert systems and knowledge-based decision su, pp.rt systems.

• Journal of Ginseng Research
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• 제23권3호
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• pp.164-171
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• 1999

가압형 마이크로웨이브 추출장치를 이용하여 추출조건(에탄올농도, 추출온도 및 추출시간)에 따른 인삼 ginsenosid서 추출특성을 반응표면분석에 의해 모니터링하고, 마이크로파 추출법의 추출효율을 확인하였다. 조건별 추출물의 ginsenoside함량에 대한 회귀식의 $R^2$는 대부분 0.830이상으로 $10\%$이내의 수준에서 유의성이 인정되었다. $Ginsenoside-Rb_2$ -Rc, -Re 및 $-Rg_1$은 추출온도가 높을수록 증가하여 $140^{\circ}C$에서 가장 높게 나타났으며, 에탄을 농도가 $50\~75\%$에서 가장 높은 추출율을 보였다. Ginsenoside의 HPLC 패턴은 MAP 추출온도 $120^{\circ}C$에서 unknown peak가 확인되었으며, $150^{\circ}C$추출에서는 unhown peak가 증가되었다. $Ginsenoside-Rb_2$와 -Re 함량에 미지화합물(unknown peak)을 포함하였을 때 는 최대의 추출온도가 $129^{\circ}C$에서 $147^{\circ}C$로 증가하였고, 동시에 추출시간과 $R^2$가 증가하였다. MAP 추출에서 unknown화합물의 함량이 최소가 되는 조건은 에탄올 농도 $67.33\%$, 추출온도 $99.34^{\circ}C$, 추출시간 3.65분이었다. 추출효율의 확인시험에서 8분간의 MAP추출법은 현행 추출법(40시간) 매우 유사한 수준의 ginsenoside 추출효율을 나타내었다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2011년도 춘계학술대회 논문집
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• pp.303-304
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• 2011

• Fibers and Polymers
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• 제5권1호
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• pp.68-74
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• 2004

This work presents a series of experimental tests on new practical approaches in membrane design to improve extraction capacity and rate. We chose an extraction system involving Aliquat 336 as the extractant and Cd(II) as the metal ion to be extracted to demonstrate these new approaches. The core element in the new membrane assembly was the extractant loaded sintered glass filter. This membrane assembly provided a large interface area between the extractant and the aqueous solution containing metal ions. By recycling the aqueous solution through the membrane assembly, the extraction rate was significantly improved. The membrane assembly also offered good extraction capacity.