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A Novel Statistical Feature Selection Approach for Text Categorization
Fattah, Mohamed Abdel Korea Information Processing Society 2017 Journal of information processing systems Vol.13 No.5
For text categorization task, distinctive text features selection is important due to feature space high dimensionality. It is important to decrease the feature space dimension to decrease processing time and increase accuracy. In the current study, for text categorization task, we introduce a novel statistical feature selection approach. This approach measures the term distribution in all collection documents, the term distribution in a certain category and the term distribution in a certain class relative to other classes. The proposed method results show its superiority over the traditional feature selection methods.
The Use of MSVM and HMM for Sentence Alignment
Fattah, Mohamed Abdel Korea Information Processing Society 2012 Journal of information processing systems Vol.8 No.2
In this paper, two new approaches to align English-Arabic sentences in bilingual parallel corpora based on the Multi-Class Support Vector Machine (MSVM) and the Hidden Markov Model (HMM) classifiers are presented. A feature vector is extracted from the text pair that is under consideration. This vector contains text features such as length, punctuation score, and cognate score values. A set of manually prepared training data was assigned to train the Multi-Class Support Vector Machine and Hidden Markov Model. Another set of data was used for testing. The results of the MSVM and HMM outperform the results of the length based approach. Moreover these new approaches are valid for any language pairs and are quite flexible since the feature vector may contain less, more, or different features, such as a lexical matching feature and Hanzi characters in Japanese-Chinese texts, than the ones used in the current research.
( Mohamed Abdel Fattah Mohamed Farid ),( Zinat Kamel ),( Elsayed Ahmed Elsayed ),( Azza Mohamed Noor El Deen ) 한국응용생명화학회 2015 Journal of Applied Biological Chemistry (J. Appl. Vol.58 No.3
Fructooligosaccharides have been mainly produced by microbial fructosyltransferases (FTase) enzymes. The present work focuses on the optimization of medium composition and cultivation parameters affecting FTase produced by Penicillium aurantiogriseum AUMC 5605 in shake flask cultivation. FTase production was optimized in two steps using DeMeo’s fractional factorial design. A 1.46-fold increase in FTase production (105.4 U/mL) was achieved using the optimized culture medium consisting of (g/L): sucrose, 600; yeast extract, 10; K2HPO4, 5; MgSO4·7H2O, 0.5; (NH4) 2SO4, 1.0 and KCl, 0.5. The obtained results showed that the maximum FTase enzyme activity was produced at initial cultivation pH values ranging from 6.0-6.5, at agitation speed of 200 rpm and using vegetative fungal cells as inoculum. Moreover, results showed that optimization of medium composition and some cultivation parameters resulted in an increase of about 93.7% in the enzyme activity than the nonoptimized cultivation conditions after 96 h of cultivation. Additionally, maximum production and specific production rates recorded 2340 U/L/h and 102 U/L/h/g cells, respectively.
A Novel Statistical Feature Selection Approach for Text Categorization
Mohamed Abdel Fattah 한국정보처리학회 2017 Journal of information processing systems Vol.13 No.5
For text categorization task, distinctive text features selection is important due to feature space highdimensionality. It is important to decrease the feature space dimension to decrease processing time andincrease accuracy. In the current study, for text categorization task, we introduce a novel statistical featureselection approach. This approach measures the term distribution in all collection documents, the termdistribution in a certain category and the term distribution in a certain class relative to other classes. Theproposed method results show its superiority over the traditional feature selection methods.
Role of protease inhibitors and acylation stimulating protein in the adipogenesis in 3T3-L1 cells
Mohamed Mohamed Soliman,Yakut Abdel-Fattah El-Senosi,Maysara Mahmoud Salem,Omniya Mahmoud Abdel Hamid,Kimura Kazuhiro 대한수의학회 2009 JOURNAL OF VETERINARY SCIENCE Vol.10 No.3
Treatment of AIDS (HIV) and hepatitis C virus needs protease inhibitors (PI) to prevent viral replication. Uses of PI in therapy are usually associated with a decrease in body weight and dyslipidemia. Acylation stimulating protein (ASP) is a protein synthesized in adipocytes to increase triglycerides biosynthesis, for that the relation of PI and ASP to adipogenesis is tested in this work. ASP expression was increased during 3T3-L1 differentiation and reached a peak at day 8 with cell maturation. Addition of PI during adipocytes differentiation dose dependently and significantly (p < 0.5) inhibited the degree of triglycerides (TG) accumulation. Moreover, presence of ASP (450 ng/mL) in media significantly (p < 0.5) stimulated the degree of TG accumulation and there was additive stimulation for ASP when added with insulin (10 μg/mL). Finally, when ASP in different doses (Low, 16.7; Medium, 45 and High, 450 ng/mL) incubated with a dose of ×150 PI, ASP partially inhibited the PI-inhibited adipogenesis and TG accumulation. The results in this study show that PI inhibit lipids accumulation and confirm role of ASP in TG biosynthesis and adipogenesis.
( Hoda Mohamed ),( Abdel Halim Shata ),( Mohamed Abdel ),( Fattah Farid ) 한국응용생명화학회(구 한국농화학회) 2012 Journal of Applied Biological Chemistry (J. Appl. Vol.55 No.3
The effects of solvent type and concentration, solid/liquid ratio, extraction time and repeated extraction on recovery ofkeratinase from solid-state fermentation (SSF) of chicken featherby a local Streptomyces sp. NRC 13S were investigated in orderto establish the experimental conditions for keratinase yield.Among solvents tested, 0.5% (v/v) glycerol was the best. Box-Behnken design was used to investigate the effect of relevantvariables on keratinase recovery. The factors investigated weresolid/liquid ratio (1:1.66-1:6.66g/mL), glycerol concentration (0.5-5% v/v) and repeated extraction (1-5 cycle). The resultsshowed that the maximum recovery of keratinase (6933.3 U/gfs)was obtained using 0.5 (v/v) glycerol as extracting solvent, in asolid /liquid ratio of 1:5 and three extraction cycles.
( Hoda Mohamed Abdel Halim Shata ),( Mohamed Abdel Fattah Farid ) 한국응용생명화학회(구 한국농화학회) 2014 Journal of Applied Biological Chemistry (J. Appl. Vol.57 No.3
Various parameters such as solvent selection, concentration, solid/liquid ratio, soaking time, temperature, stationary, shaking conditions, and repeated extractions were investigated in order to determine the optimum extraction conditions of β-glucosidase from bagasse fermented by mixed culture of Aspergillus niger NRC 7A and Aspergillus oryzae NRRL 447. Among various solvents tested, non ionic detergents gave the best results than the inorganic or organic salt solutions and distilled water. The optimum conditions for extraction of β-glucosidase were 30 min soaking time at 40oC under shaking condition at 150 rpm, with solid/liquid ratio 1:15 (w/v), which yielded 2882.74±95.52 U/g fermented culture (g fc) of enzyme activity. With repeated washes under the above optimum conditions, the results showed that enzyme extracted in the 1st and 2nd washes represents about 90% of the total activity.
( Hoda Mohamed Abdel Halim Shata ),( Azza Mohmed Noor El-deen ),( Galal Abdel Moen Nawwar ),( Mohmed Abdel Fattah Farid ) 한국응용생명화학회(구 한국농화학회) 2014 Journal of Applied Biological Chemistry (J. Appl. Vol.57 No.4
Black liquor (BL) is a by-product of rice straw pulping process. It is a low costs raw material for production value-adding proteins and enzymes, which has been paid more and more attention to reduce its environmental pollution. Mixed cultures of micelial fungi, Trichoderma reesei Northern Regional Research Laboratory (NRRL)11236, Trichoderma reesei NRRL 6165 and Aspergillus niger strains NRC 5A, NRC 7A, and NRC 9A were evaluated for their ability to produce xylanase using crude hemicellulose (CHC) prepared from BL and peat moss as an inert support under solid state fermentation (SSF). The most potent strains, A. niger NRC 9A (818.26 U/g CHC) and T. reesei NRRL 6165 (100.9±57.14 U/g CHC), were used in a mixed culture to enhance xylanase production by co-culturing under SSF. In the mixed culture, xylanase production (1070.52±12.57 U/g CHC) was nearly1.3 and 10.6-fold increases over the activities attained in their monocultures, A. niger NRC 9A and T. reesei NRRL 6165, respectively. Optimization of the culture parameters of the mixed culture SSF process, concentration of ammonium sulfateand corn steep liquor, CHC/peat moss ratio, inoculum size and ratios of the two strains, initial pH value, initial moisture content and incubation time, exhibited a significant increase (2414.98± 84.02 U/g CHC) in xylanase production than before optimization.
( Hoda Mohamed Abdel Halim Shata ),( Mohamed Abdel Fattah Farid ) 한국응용생명화학회(구 한국농화학회) 2013 Journal of Applied Biological Chemistry (J. Appl. Vol.56 No.2
Thirteen different Streptomyces isolates were evaluated for their ability to produce keratinase using chicken feather as a sole carbon and nitrogen sources under solid state fermentation (SSF). Streptomyces sp. NRC 13S produced the highest keratinase activity [1,792 U/g fermented substrate (fs)]. The phenotypic characterization and analysis of 16S rDNA sequencing of the isolate were studied. Optimization of SSF medium for keratinase production by the local isolate, Streptomyces sp. NRC13S, was carried out using the one-variable-at-a-time and the statistical approaches. In the first optimization step, the effect of incubation period, initial moisture content, initial pH value of the fermentation medium, and supplementation of some agro-industrial by-products on keratinase production were evaluated. The strain produced about 2,310 U/gfs when it grew on chicken feather with moisture content of 75% (w/w), feather: fodder yeast ratio of 70:30 (w/w), and initial pH 7 using phosphate buffer after 8 days. Based on the results, the Box-Behnken design and response surface methodology were applied to find out the optimal conditions for the enzyme production. The corresponding maximal production of keratinase was about 2,569.38 U/gfs.