• 제목/요약/키워드: extracting methods

검색결과 948건 처리시간 0.031초

Separation and Purification of Cholesterol from By-product of Low Cholesterol Egg Yolk (저콜레스테롤 난황 제조시 생성되는 부산물로부터 콜레스테롤의 분리 정제)

  • 유익종;조혜연;박우문;전기홍;최성유
    • Food Science of Animal Resources
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    • 제20권1호
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    • pp.36-43
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    • 2000
  • $\beta$-cyclodextrin adsorption and saponification methods were applied to isolate and purify cholesterol from the by-product of the low-cholesterol egg yolk product. They by-product was prepared from processing low-cholesterol egg yolk followed by extracting with chloroform to remove $\beta$-cyclodextrin and concentrated to 3,069 mg% cholesterol. When $\beta$-cyclodextrin method between two purification methods was applied, 50% ethanol as a solvent showed higher cholesterol concentration of 5.82% rather than the other solvents. Repeated purification of 3 times could not improve the cholesterol concentration significantly(p<0.05). In case of purification using saponification method, hexane as a solvent for extraction of unsaponificated materials was more efficient to increase cholesterol concentration than chloroform and ether. 60 times(v/w) saponification solution (95% ethanol:33% KOH = 94:6) of sample weight was most effective to increase the cholesterol concentration of 35.7%. Repeated purification process by saponification method could increase cholesterol concentration to 95.7% by 4 times repetition.

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A Study on Analysis of the Implementation Status and the Advancement of Computerized Maintenance Management System (CMMS) in Korean Companies (한국기업의 설비관리정보시스템(CMMS) 구현실태 분석과 고도화에 관한 연구)

  • Ku, Sung Tae;Kim, Chang Eun
    • Journal of Korean Society for Quality Management
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    • 제41권4호
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    • pp.693-708
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    • 2013
  • Purpose: This study is to develop an evaluation model for analysis of CMMS Implementation status and provide CMMS advancement methods to maximize implementation effect through the evaluation model. Methods: After extracting common modules from CMMS packages and establishing evaluation standard for each module, then the evaluation standard is applied to 33 Korean companies for evaluating their own current implementation status. Results: Preventive maintenance and analysis information modules were considered the most vulnerable in Korean companies which have introduced CMMS packages. And the reason why preventive maintenance is vulnerable is that there is poor build-up of their own preventive maintenance standards. Conclusion: Korean companies which will introduce CMMS need to make preventive maintenance standards, and data of the materials and the equipment to improve the effectiveness in advance.

Interprocedural Transformations for Parallel Computing

  • Park, Doo-Soon;Choi, Min-Hyung
    • Journal of Korea Multimedia Society
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    • 제9권12호
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    • pp.1700-1708
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    • 2006
  • Since the most program execution time is consumed in a loop structure, extracting parallelism from loop programs is critical for the taster program execution. In this paper, we proposed data dependency removal method for a single loop. The data dependency removal method can be applied to uniform and non-uniform data dependency distance in the single loop. Procedure calls parallelisms with only a single loop structure or procedure call most of other methods are concerned with the uniform code within the uniform data dependency distance. We also propose an algorithm, which can be applied to uniform, non-uniform, and complex data dependency distance among the multiple procedures. We compared our method with conventional methods using CRAY-T3E for the performance evaluation. The results show that the proposed algorithm is effective.

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Agglomerative Hierarchical Clustering Analysis with Deep Convolutional Autoencoders (합성곱 오토인코더 기반의 응집형 계층적 군집 분석)

  • Park, Nojin;Ko, Hanseok
    • Journal of Korea Multimedia Society
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    • 제23권1호
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    • pp.1-7
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    • 2020
  • Clustering methods essentially take a two-step approach; extracting feature vectors for dimensionality reduction and then employing clustering algorithm on the extracted feature vectors. However, for clustering images, the traditional clustering methods such as stacked auto-encoder based k-means are not effective since they tend to ignore the local information. In this paper, we propose a method first to effectively reduce data dimensionality using convolutional auto-encoder to capture and reflect the local information and then to accurately cluster similar data samples by using a hierarchical clustering approach. The experimental results confirm that the clustering results are improved by using the proposed model in terms of clustering accuracy and normalized mutual information.

ON IMPROVING THE PERFORMANCE OF CODED SPECTRAL PARAMETERS FOR SPEECH RECOGNITION

  • Choi, Seung-Ho;Kim, Hong-Kook;Lee, Hwang-Soo
    • Proceedings of the Acoustical Society of Korea Conference
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    • 한국음향학회 1998년도 제15회 음성통신 및 신호처리 워크샵(KSCSP 98 15권1호)
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    • pp.250-253
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    • 1998
  • In digital communicatioin networks, speech recognition systems conventionally reconstruct speech followed by extracting feature [parameters. In this paper, we consider a useful approach by incorporating speech coding parameters into the speech recognizer. Most speech coders employed in the networks represent line spectral pairs as spectral parameters. In order to improve the recognition performance of the LSP-based speech recognizer, we introduce two different ways: one is to devise weighed distance measures of LSPs and the other is to transform LSPs into a new feature set, named a pseudo-cepstrum. Experiments on speaker-independent connected-digit recognition showed that the weighted distance measures significantly improved the recognition accuracy than the unweighted one of LSPs. Especially we could obtain more improved performance by using PCEP. Compared to the conventional methods employing mel-frequency cepstral coefficients, the proposed methods achieved higher performance in recognition accuracies.

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Application of Nonlinear System Identification Theory to the Physiological System Analysis - A Survey (생체시스템해석시의 비선형시스템이론의 적용에 대한 고찰)

  • Tack, G.R.
    • Proceedings of the KOSOMBE Conference
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    • 대한의용생체공학회 1997년도 추계학술대회
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    • pp.95-98
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    • 1997
  • In this paper, several nonlinear system identification theories and the application of these methods to the physiological system are reviewed by extracting significant results from the literature. Methods based on unctional series expansion, parameter estimation, block-oriented models are included. However, there is still considerable debate about the advantages and disadvantages of each approach. This is true primarily because each method has limitations on the types of assumption and interpretation, types of nonlinear elements, etc. This means that user must select an appropriate method and the selection will depend on the problem under investigation.

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A Automatic Document Summarization Method based on Principal Component Analysis

  • Kim, Min-Soo;Lee, Chang-Beom;Baek, Jang-Sun;Lee, Guee-Sang;Park, Hyuk-Ro
    • Communications for Statistical Applications and Methods
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    • 제9권2호
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    • pp.491-503
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    • 2002
  • In this paper, we propose a automatic document summarization method based on Principal Component Analysis(PCA) which is one of the multivariate statistical methods. After extracting thematic words using PCA, we select the statements containing the respective extracted thematic words, and make the document summary with them. Experimental results using newspaper articles show that the proposed method is superior to the method using either word frequency or information retrieval thesaurus.

Natural Dyeing of Silk Fabric using Purple-Fleshed Sweet Potato (자색 고구마를 이용한 견직물의 염색)

  • Kim, Sang-Yool;Rhim, Jong-Whan
    • Fashion & Textile Research Journal
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    • 제5권4호
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    • pp.399-407
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    • 2003
  • The natural dyeing of silk fabric with Purple-Fleshed Sweet Potato (PSP) was investigated. The colorant was extracted with distilled water, and the color difference (${\Delta}E^*$) was increased with increasing the amount of PSP in extraction. The proper temperature and time for the extracting of colorant with PSP were $60^{\circ}C$ and 60 minutes. The optimum temperature, time and pH for the dyeing of silk with extracted PSP were $60^{\circ}C$, 60 minutes and pH 4 respectively. In various mordanted methods, the color difference values of post-mordanted silk fabric were higher than those of pre- and simultaneous-mordanted method. And the wide range of colors( GY, Y, YR, R, RP) were obtained according to various mordants, mordanting methods and mordant concentrations. Light colorfastness of the mordanted silk fabric was improved. Laundering colorfastness, dry cleaning colorfastness and perspiration colorfastness were shown to be good.

Simulation for PLC using Matlab (Matlab을 이용한 전력선 통신 시뮬레이션)

  • Hong, Duc-Pyo;Lee, Jin-Mok;Choi, Jae-Ho
    • Proceedings of the KIEE Conference
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    • 대한전기학회 2006년도 제37회 하계학술대회 논문집 B
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    • pp.1002-1003
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    • 2006
  • Power line communication: PLC which easy to install at anywhere near outlet for electric machine. PLC uses transmission line for voltage of which is 60 Hz. One of the important thing is the processes of adding signal to power line and extracting the signal from power line, another is to choose the strong modulation method which sends signals to long distance without loosing in PLC channel. but PLC channel have very high and variable noise and attenuation and then it is very hard to transmit optimally between the transmitter and the receiver. AWGN, impulse noise and attenuation are created. To overcome the noise and attenuation. Multi-carrier Modulation methods like as OFDM and DMT which divide the channel into many sub-channel are powerful communication methods for PLC. In this paper, PLC channels are simulated for getting BER by Matlab simulink

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Comparison of Extraction Methods for Aglycone isoflavones from Korean Soybean (토종콩에 포함된 비배당체 이소플라본의 추출 방법 비교)

  • Lee Kwang Jin;Row Kyung Ho
    • KSBB Journal
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    • 제19권6호
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    • pp.421-426
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    • 2004
  • The extraction and separation of isoflavones from Korean soybean were peformed by various mechanical and chemical extraction methods. They included solvent extraction, stirring, supersonification and sub/supercritical water extraction. From the experimental results of the variation of solvent extraction by change in composition, the increase in extraction of a specific compound by stirring or supersonic energy, and the application of supercritical fluid with superior solvating power over solvents, the sonification was the most desirable extraction method in extracting aglycone isoflavones, daidzein and genistein from Korean soybean.