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간섭 및 반향신호 제거를 위한 다단계 구조의 다채널 암묵 디콘볼루션
임정우,정규혁,주기호,김영주,이인성,Lim, Joung-Woo,Jeong, Gyu-Hyeok,Joo, Gi-Ho,Kim, Young-Ju,Lee, In-Sung 대한전자공학회 2007 電子工學會論文誌-SP (Signal processing) Vol.44 No.1
다채널 암묵 디콘볼루션을 자기상관 값이 큰 신호에 적용할 경우 분리필터행렬의 주대각 성분에 의해서 분리신호의 시간백색화가 발생한다. 이러한 왜곡을 줄이기 위해 분리필터 행렬의 주대각 성분을 강제하거나 선형예측 잔여신호를 이용하여 분리필터 행렬을 구하는 방법들이 제안되었지만 신호자신의 반향성분이나 간섭신호 분리에 있어서 문제점이 발생된다. 본 논문에서는 이러한 문제들을 해결하기 위해서 간섭신호의 분리를 위한 단계와 신호자신의 반향을 감소시키기 위한 단계를 분리하여 처리하는 구조의 다채널 암묵 디콘볼루션 방법을 제안한다. 모의실험 결과 혼합신호에서 간섭신호를 분리해낼 수 있을 뿐만아니라 신호 자신의 반향 또한 감소됨을 확인하였다. In case that multichannel blind deconvolution (MBD) applies to signals of which autocorrelation has a high level, separated signals are temporally whitened by diagonal elements of a separation filter matrix. In order to reduce this distortion, the algorithms, which are based on either constraining diagonal elements of a separation filter matrix or estimating a separation filter matrix by using linear prediction residual signals, are presented. Still, some problems are generated in these methods, when we separate reverberation of signals themselves or interference signals from mixed signals. To solve these problems, this paper proposes the multichannel blind deconvolution method which divides processing procedure into the stage to separate interference signals and the stage to eliminate a reverberation of signals themselves. In simulation results, we confirm that the proposed algorithm can solve the problems.
임유성 ( Yu-seong Lim ),최윤영 ( Yun-young Choi ),김종익 ( Jong-ik Kim ),최정우 ( Jeong-woo Choi ) 한국수처리학회 2016 한국수처리학회지 Vol.24 No.3
This study is about the sediment distribution change characteristics using a two-dimensional model and selected the representative grain diameter by using the results of riverbed changes simulation using suspended sediment concentrations before and after river maintenance and river bed materials and compared and reviewed the results of simulating the resulting river bed changes. A analysis target river is Daecheon located in Gyeongju, Gyeongbuk and suspended sediment survey results showed that the suspended sediment grain diameter before and after river maintenance was found not to show a big difference, the average grain diameter before and after river maintenance 0.0606mm and 0.0591mm, respectively but it was analyzed that a significant difference occurs, the highest suspended sediment concentration before ana after river maintenance 58.6mg/l and 140.7mg/l, respectively. Also, when applying the suspended sediment concentration measured in the river bed state before river maintenance and applying suspended sediment concentration measured in the river bed state after river maintenance, various suspended sediment concentration was analyzed to generate the differences of erosion and sedimentation and based on the differences by the left bank, middle, right bank, maximum erosion 0.0028m and maximum sedimentation 0.0043m, maximum erosion 0.0013mm and maximum sedimentation 0.0027m, maximum erosion 0.0084m and maximum sedimentation 0.0062m of the difference in erosion and sedimentation were shown at the left bank, middle, right bank, respectively. Riverbed changes appear differently depending on river maintenance and the proper maintenance of the river is determined to be made when adopting an appropriate analysis method according to the riverbed shape during river maintenance and management before and after river maintenance.
프로필렌 옥사이드를 부가한 소듐 라우레스 설페이트 음이온 계면활성제의 계면 특성에 관한 연구
이정민 ( Jeong Min Lee ),박기호 ( Ki Ho Park ),신희동 ( Hee Dong Shin ),정우진 ( Woo Jin Jeong ),임종주 ( Jong Choo Lim ) 한국공업화학회 2023 공업화학 Vol.34 No.3
본 연구에서는 라우릴 알코올에 에틸렌 옥사이드 3 몰과 프로필렌 옥사이드 1 몰을 부가한 후 설페이션을 공정을 거쳐서 ASCO<sup>Ⓡ</sup> SLES-430을 제조하였으며, 합성한 계면활성제의 구조를 FT-IR, <sup>1</sup>H-NMR 및 <sup>13</sup>C-NMR 분석을 통하여 확인하였다. 합성한 ASCO<sup>Ⓡ</sup> SLES-430의 임게 마이셀 농도, 정적 표면장력, 유화력, 접촉각 등의 계면 물성과 경구 독성 및 피부 자극성 등의 안정성 지표 등을 측정하였으며, SLES 계면활성제 내에 에틸렌 옥사이드가 각각 2 몰 및 3 몰 부가된 ASCO<sup>Ⓡ</sup> SLES-226 및 ASCO<sup>Ⓡ</sup> SLES-328 계면활성제들과 비교하였다. 특히, ASCO<sup>Ⓡ</sup> SLES-430의 기포 생성력과 기포 안정성을 평가하여 기존 세제 제품에서 널리 사용되고 있는 ASCO<sup>Ⓡ</sup> SLES-226과 ASCO<sup>Ⓡ</sup> SLES-328과 비교함으로써 ASCO<sup>Ⓡ</sup> SLES-430의 소형 빌트인 세탁기용 세제 적용 가능성을 검토하였다. In this study, ASCO<sup>Ⓡ</sup> SLES-430 surfactant was synthesized by adducting 3 moles of ethylene oxide and 1 mole of propylene oxide to lauryl alcohol followed by a sulfation process, and the structure of the synthesized ASCO<sup>Ⓡ</sup> SLES-430 was elucidated by performing FT-IR, <sup>1</sup>H-NMR and <sup>13</sup>C-NMR analyses. Interfacial properties such as critical micelle concentration, static surface tension, emulsification index, and contact angle were measured, and environmental compatibility indices such as oral toxicity and skin irritation were also estimated for ASCO<sup>Ⓡ</sup> SLES-430. Both results were compared with ASCO<sup>Ⓡ</sup> SLES-226 and ASCO<sup>Ⓡ</sup> SLES-328 SLES surfactants possessing 2 moles and 3 moles of ethylene oxide, respectively. In particular, both foaming ability and foam stability were evaluated for ASCO<sup>Ⓡ</sup> SLES-430 and compared with ASCO<sup>Ⓡ</sup> SLES-226 and ASCO<sup>Ⓡ</sup> SLES-328, which have been widely used in detergent products, in order to test the potential applicability of ASCO<sup>Ⓡ</sup> SLES-430 in detergent product formulation for a small capacity built-in washing machine.
Damping 요소를 첨가한 매칭 퍼슈잇 정현파 모델링
정규혁,김종학,임정우,주기호,이인성,Jeong, Gyu-Hyeok,Kim, Jong-Hark,Lim, Joung-Woo,Joo, Gi-Ho,Lee, In-Sung 대한전자공학회 2007 電子工學會論文誌-SP (Signal processing) Vol.44 No.1
본 논문은 정현파 모델 기반의 코덱을 위한 매칭 퍼슈잇(Matching Pursuit)의 성능을 개선시킨 새로운 정현파 모델링을 제안한다. 제안하는 damping 요소를 첨가한 매칭 퍼슈잇 정현파 모델링은 과거와 현재 프레임에서 파라미터들간의 상관성을 이용하여 damping 요소를 정의하고 현재 프레임에서 보다 정확한 정현파 파라미터를 damping 요소에 따라 매칭 퍼슈잇 방법으로 추출한 후 합성한다. 따라서 인접 프레임과의 보간 없이 현재 프레임에서의 정현파 파라미터만으로 효율적인 모델링이 가능하다. 제안한 모델링 방법은 보간법을 사용한 일반적인 정현파 모델과 달리 추가지연을 가지지 않으면서 유성음 구간 신호뿐만 아니라 모든 구간에서 개선된 음질을 보인다. 제안한 모델링 방법의 성능을 SNR, MOS값, LR(Itakura-Saito likelihood ratio), CD(cepstral distance)를 통해 보간법을 사용한 매칭 퍼슈잇과 비교 평가한다. In this paper, we propose the matching pursuit with damping factors, a new sinusoidal model improving the matching pursuit, for the codecs based on sinusoidal model. The proposed model defines damping factors by using a correlativity of parameters between the current and adjacent frame, and estimates sinusoidal parameters more accurately in analysis frame by using the matching pursuit according to damping factor, and synthesizes the final signal. Then it is possible to model efficiently without interpolation schemes. The proposed sinusoidal model shows a better speech quality without an additional delay than the conventional sinusoidal model with interpolation methods. Through the SNR(signal to noise ratio), the MOS(Mean Opinion Score), LR(Itakura-Saito likelihood ratio), and CD(cepstral distance), we compare the performance of our model with that of matching pursuit using interpolation methods.
양지혜(Jihae Yang),임정우(Jeong-Woo Lim),장달식(Dal-Sik Jang) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
In this paper, the procedure to analyze cooling performance of the engine room for an excavator is presented by the help of a recently developed CFD technique. Engineers spend most of time and effort defining and generating model of the engine room to attain to accurate numerical result by a conventional CFD code, which makes it hard to get the optimal layout and part shape of cooling system. Therefore Cartesian(non-body-fitted) grid is introduced to reduce simulation time and to obtain more accurate result in this cooling system analysis. In addition, the well defined boundary condition for the CFD model and the experimental data of cooling components are also important factors in getting reasonable result. To verify the proposed procedure, the experimental results of the cooling system were compared with the simulation results. It is shown that the proposed simulation method and modeling technique are effective in the optimal cooling system design of an excavator engine room.