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Sentiment Analysis using Various Machine Learning Techniques: A Review
Pinky Yadav,Madhumita Kathuria 대한전자공학회 2022 IEIE Transactions on Smart Processing & Computing Vol.11 No.2
Sentiment analysis is the study of deriving opinions and insights from a tremendous amount of text data present on various social media platforms like Facebook, Twitter, and many others. Nowadays, it is vital for companies and organizations to behold the reviews or public opinion about their product to survive in a competitive market. In sentiment analysis, we categorize this data into nominal labels or polarity, which maps the review to an overall sentiment. This research paper provides a review of various machine learning techniques for sentiment analysis in detail on social media data. Along with the text reviews, the emoticons between the text will also be analyzed to achieve the exact sentiment of the reviewer.
Pinki Mishra,Rizwana Parveen,Ram Bajpai,Nidhi Agarwal 대한예방의학회 2022 예방의학회지 Vol.55 No.4
Objectives: Extensive evidence links low vitamin D status and comorbidities with coronavirus disease 2019 (COVID-19) outcomes, but the results of published studies are contradictory. Therefore, we investigated the association of lower levels of vitamin D and comorbidities with the risk of COVID-19 infection. Methods: We searched MEDLINE (via PubMed), Cochrane Central Register of Controlled Trials, and ClinicalTrials.gov for articles published until August 20, 2021. Sixteen eligible studies were identified (386 631 patients, of whom 181 114 were male). We included observational cohort and case-control studies that evaluated serum levels of vitamin D in COVID-19-positive and COVID-19-negative patients. Mean differences (MDs) with 95% confidence intervals (CIs) were calculated. Results: Significantly lower vitamin D levels were found in COVID-19-positive patients (MD, -1.70; 95% CI, -2.74 to -0.66; p=0.001), but with variation by study design (case-control: -4.04; 95% CI, -5.98 to -2.10; p<0.001; cohort: -0.39; 95% CI, -1.62 to 0.84; p=0.538). This relationship was more prominent in female patients (MD, -2.18; 95% CI, -4.08 to -0.28; p=0.024) than in male patients (MD, -1.74; 95% CI, -3.79 to 0.31; p=0.096). Male patients showed higher odds of having low vitamin D levels (odds ratio [OR], 2.09; 95% CI, 1.38 to 3.17; p<0.001) than female patients (OR, 1.17; 95% CI, 0.74 to 1.86; p=0.477). Comorbidities showed inconsistent, but generally non-significant, associations with COVID-19 infection. Conclusions: Low serum vitamin-D levels were significantly associated with the risk of COVID-19 infection. This relationship was stronger in female than in male COVID-19 patients. Limited evidence was found for the relationships between comorbidities and COVID-19 infection, warranting large population-based studies to clarify these associations.
Pinky Moni Bhuyan,Sosanka Protim Sandilya,Pranab Kumar Nath,Sakshi Gandotra,Sabtharishi Subramanian,Devid Kardong,Dip Kumar Gogoi 한국응용곤충학회 2018 Journal of Asia-Pacific Entomology Vol.21 No.4
Mature larvae of Antheraea assamensis were collected from different locations of Assam to isolate the cellulolytic gut microflora. Altogether sixty cellulase degrading bacteria were isolated on agar plates containing microcrystalline cellulose as the sole carbon source. Among them, ten isolates showed hydrolyzing zone on agar plates containing carboxy methyl cellulose (CMC) after staining with Congo-red. Isolate MGB05 exhibited the highest CMCase activity (0.262 U/mL) at 72 h of incubation under submerged condition. FPase and β-glucosidase activity were 0.012 U/mL and 3.71 U/mL respectively. It showed maximum FPase (0.022 U/mL) activity on the 3rd day of incubation in the media containing wheat bran as a carbon source. β-glucosidase production was also found to be highest with wheat bran (20.03 U/mL) at 48 h of incubation. The optimum pH and temperature of FPase activity of MGB05 were found at 6.0 and 50 °C respectively while for β-glucosidase activity, it was maximum at pH 6.0 under 50 °C. In addition, metal ion Mg ++ and Ca ++ enhanced FPase activity up to 110.92% (0.026 U/mL) and 105.31% (0.025 U/mL) respectively. In-vitro antimicrobial bioassay of the most potent cellulolytic bacteria (MGB05) also showed high antimicrobial activity against Escherichia coli (2.9 cm) and Pseudomonas aeruginosa (3.0 cm). The isolate MGB05 has been identified based on 16S rDNA homology as Bacillus pumilus MGB05 with accession KP298708.2. Results encompass the prospective beneficial role of gutmicroflora on digestion and disease resistance, which might be a potential probiotic component to enhance silk productivity.
Pinki Kashyap,Manju Rani,Dinesh Pratap Tiwari,박소진 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.11
Dynamic viscosities (η) of the binary liquid mixtures of 2-propanol (1)+n-alkanes (C6, C7, C9) (2) at T=288.15 K to 303.15 K and ethanol (1)+n-alkanes (C6, C7 , C8) (2) at T=308.15 K to 318.15 K were experimentally measured over the whole composition range. Experimental values of η were used to compute the deviation in dynamic viscosity (Δη) and these Δη values were correlated with the Redlich-Kister equation. The η values of binary mixtures were also calculated using several empirical correlations and mixing rules like Grunberg-Nissan, Tamura-Kurata, Kati- Chaudhari and McLaughlin-Ubbelohde and found that the Grunberg-Nissan correlation gave the best estimation. The Δη values were also predicted by an approach given by Singh et al. [Indian J Chem 29, 263 (1990)].
Kashyap, Pinki,Rani, Manju,Tiwari, Dinesh Pratap,Park, So-Jin The Korean Institute of Chemical Engineers 2020 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.58 No.2
Densities (ρ) for binary mixtures of ethanol (1) + diisopropyl ether (DIPE) or cyclohexane or alkane (C<sub>6</sub>-C<sub>9</sub>) (2) were measured at 298.15 K, 308.15 K and 318.15 K. The excess molar volume (V<sup>E</sup><sub>m</sub>) of binary mixtures was calculated using ρ data and correlated with Redlich-Kister polynomial equation. The V<sup>E</sup><sub>m</sub> values for binary mixtures of ethanol (1) + cyclohexane or n-alkane (C<sub>6</sub>-C<sub>9</sub>) (2) were positive, whereas for ethanol (1) + DIPE (2) these were negative. The magnitude of V<sup>E</sup><sub>m</sub> values follows the order: cyclohexane > n-nonane > n-octane > n-heptane > n-hexane > DIPE. The V<sup>E</sup><sub>m</sub> values have been interpreted qualitatively and also quantitatively in terms of Flory-Treszczanowicz-Benson (FTB) model and Prigogine-Flory-Patterson (PFP) theory. The values V<sup>E</sup><sub>m</sub> predicted using FTB model agree well with experimental V<sup>E</sup><sub>m</sub> values at all mole fractions. But the PFP theory describes well V<sup>E</sup><sub>m</sub> data in ethanol-rich region (x<sub>1</sub> > 0.5) for all binary mixtures and is able to predict the sign of V<sup>E</sup><sub>m</sub> vs x<sub>1</sub> curve for ethanol-lean region (x<sub>1</sub> < 0.5) except for ethanol (1) + nonane (2) mixtures.
Sangeeta Kalal,Pinki Bala Punjabi,Narendra Pal Singh Chauhan,Noopur Ameta,Rakshit Ameta,Sudhish Kumar 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.12
The heterogeneous photo-Fenton like process is a green chemical pathway. It has an edge over conven-tional Fenton and photo-Fenton processes as it does not require the removal of ferrous/ferric ions in the form of sludge. We prepeared copper pyrovanadate or Volborthite (Cu3V2(OH)2O7·2H2O) composite photocatalyst by wet chemicalmethod. The photocatalyst was characterized by SEM, XRD, IR, TGA/DSC, EDX and BET. Experiments demon-strated that catalyst could effectively catalyze degradation of neutral red and azure-B in presence of H2O2 in visiblelight. Moreover, the photo-Fenton-like catalytic activity of Cu3V2(OH)2O7·2H2O was much higher than CuO and V2O5,when used alone as photocatalyst. The effect of variation of different parameters, i.e., pH, amount of photocatalyst,concentration of dye, amount of H2O2 and light intensity was also investigated. The degradation was well fitted underpseudo-first-order reaction with a rate constant of 2.081×10−4sec−1and 3.876×10−4sec−1for neutral red and azure-B,respectively. Quality parameters of dye solutions before and after photo-Fenton degradation were also determined. Atentative mechanism involving•OH radical as an oxidant has been proposed. The high catalytic activity may be dueto the Cu3V2(OH)2O7·2H2O shell, which not only increased the surface hydroxyl groups, but also enhanced the interfacialelectron transfer. The catalyst has been found to possess good recyclability.
Vijayata Sangwan,Sunita Siwach,Pinki Lakra,Mukesh Sangwan,Sanjeet Singh,Rajiv Mahendru 대한산부인과학회 2019 Obstetrics & Gynecology Science Vol.62 No.6
ObjectiveAfter globally acceptance of planned vaginal birth after cesarean section (VBAC), the mode of induction is still amatter of debate and requires further discussion. We aimed to study obstetric outcomes in post-cesarean patientsundergoing induction of labor with prostaglandin gel compared with patients who developed spontaneous laborpains. MethodsAll patients at 34 weeks or more of gestation with previous one cesarean section eligible for trial of labor aftercesarean section admitted in a labor room within one year were divided in 2 groups. Group one consisted of patientswho experienced the spontaneous onset of labor pains and group 2 consisted of patients who underwent inductionof labor with prostaglandin gel. They were analyzed for maternofetal outcomes. Descriptive statistics, independentsample t-test, and chi-square test were applied using SPSS 20 software for statistical analysis. ResultsBoth groups were comparable in maternal age, parity, and fetal weight, but different in bishop score, mode ofdelivery, and neonatal outcome. Admisson bishop score was 6.61±2.51 in group 1 and 3.15±1.27 in group 2 (P<0.005). In the patients who experienced spontaneous labor, 86.82% had successful VBAC. In the patients with induced labor,64.34% had successful VBAC with an average dose of gel of 1.65±0.75. Both groups had one case each of uterinerupture. The neonatal intensive care unit admission rate was 4.1% in group one and 10.4% in group 2. ConclusionThis study reflects that supervised labor induction with prostaglandin gel in previous one cesarean section patients isa safe and effective option.
Thakur, Atul,Punia, Pinki,Dhar, Rakesh,Aggarwal, R.K.,Thakur, Preeti Techno-Press 2022 Advances in nano research Vol.12 No.5
The potentials of Ni<sub>x</sub>Zn<sub>1-x</sub>Fe<sub>2</sub>O<sub>4</sub> (x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0) nanoadsorbents were investigated for removal of Cd and Cr from contaminated water from an electroplating industry in Himachal Pradesh, India. Optimal values were recorded under batch adsorption experiments performed to remove dissolved heavy metal ions from industrial wastewater. The specific surface area (SSA) of nanoadsorbents perceived to vary in a range 35.75-45.29 cm<sup>2</sup>/g and was calculated from the XRD data. The influence of two operating parameters, contact time and dopant (Ni) concentration was also investigated at pH ~7 with optimum dosage. Kinetic studies were conducted within a time range of 2-10 min with rapid adsorption of cadmium and chromium ions onto Ni<sub>0.2</sub>Zn<sub>0.8</sub>Fe<sub>2</sub>O<sub>4</sub> nanoadsorbents. Pseudo-second-order kinetic model was observed to be well fitted with the adsorption data that confirmed the only existence of chemisorption throughout the adsorption process. The maximum adsorption efficiency values observed for Cd and Cr were 51.4 mg/g and 40.12 mg/g, respectively for different compositions of prepared series of nanoadsorbents. The removal percentage of Cd and Cr was found to vary in a range of 47.7%-95.25% and 21%-50% respectively. The prepared series of nanoferrite found to be suitable enough for adsorption of both heavy metal ions.