检索结果-南通市图书馆

Predicting Bitcoin Trends Through Machine Learning Using Sentiment Analysis with Technical Indicators

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computer Systems Science & Engineering 2023年第8期46卷 2231-2246页

作者： Hae sun Jung Seon Hong Lee Haein Lee jang Hyun Kim Department of Applied Artificial Intelligence/Department of Human-Artificial Intelligence Interaction Sungkyunkwan UniversitySeoul03063Korea Department of Interaction Science/Department of Human-Artificial Intelligence Interaction Sungkyunkwan UniversitySeoul03063Korea

Predicting Bitcoin price trends is necessary because they represent the overall trend of the cryptocurrency *** the history of the Bitcoin market is short and price volatility is high,studies have been conducted on the factors affecting changes in Bitcoin *** have been conducted to predict Bitcoin prices using Twitter ***,the amount of data was limited,and prices were predicted for only a short period(less than two years).In this study,data from Reddit and LexisNexis,covering a period of more than four years,were *** data were utilized to estimate and compare the performance of the six machine learning techniques by adding technical and sentiment indicators to the price data along with the volume of *** accuracy of 90.57%and an area under the receiver operating characteristic curve value(AUC)of 97.48%were obtained using the extreme gradient boosting(XGBoost).It was shown that the use of both sentiment index using valence aware dictionary and sentiment reasoner(VADER)and 11 technical indicators utilizing moving average,relative strength index(RSI),stochastic oscillators in predicting Bitcoin price trends can produce significant ***,the input features used in the paper can be applied on Bitcoin price ***,this approach allows investors to make better decisions regarding Bitcoin-related investments.

关键词： Bitcoin cryptocurrency sentiment analysis price trends prediction natural language processing machine learning

Safety assessment of condensed phosphate intake from fishery and processed marine food products in Korea with respect to gender,age,and region

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Food Quality and Safety 2021年第2期5卷 161-169页

作者： Hyung Soo Kim Dae Yong jang Ye Ji Koo eun Chul Pack Seung Ha Lee Dal Woong Choi Health Science Research Center Korea UniversitySeoulRepublic of Korea department of Public Health Sciences Graduate SchoolKorea UniversitySeoulRepublic of Korea School of Health and Environmental Sciences Korea UniversitySeoulRepublic of Korea and department of Health and Safety Convergence Science Graduate SchoolKorea UniversitySeoulRepublic of Korea.

Condensed phosphates are used as food additives,especially in marine products and meat,to improve food *** import and consumption of fishery and processed marine food products in Republic of Korea have reportedly increased by~5 per cent ***,processed marine food products are often intentionally adulterated with excessive amounts of condensed phosphates to increase their *** intake of condensed phosphates via consuming processed marine food products can lead to various adverse effects on human health due to anionic ***,we conducted a safety assessment of condensed phosphates in 14 types of fishery and processed marine food products in Korea for the first *** analysis of various factors including gender,age,and region was also performed,and the risk level of exposure for each group was *** assessments by age and gender indicated that infants were at the highest *** the regional safety assessment,Chungnam,the most inland region,showed the lowest *** both the general and the high-intake groups(95th percentile)in all classifications,the risk was lower(<20 per cent)than the international standard,and the phosphorus content of the 14 types of processed marine products in Korea was confirmed to be safe for human consumption.

关键词： Condensed phosphates safety assessment ion chromatography fishery and processed marine food products

Systematic review on the surgical treatment for T1 gallbladder cancer

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2011年第2期17卷 174-180页

作者： Seung eun Lee Jin-Young jang Chang-Sup Lim Mee Joo Kang sun-Whe Kim Department of Surgery Chung-Ang University College of Medicine Department of Surgery Seoul National University College of Medicine

AIM:To evaluate the efficacy of simple and extended cholecystectomy for mucosa(T1a) or muscularis(T1b) gallbladder(GB) cancer. METHODS:Original studies on simple and extended cholecystectomy for T1a or T1b GB cancer were searched from MEDLINE(PubMed) ,Cochrane Library,EMBase,and CancerLit using the search terms of GB,cancer/carcinoma/tumor/neoplasm. RESULTS:Twenty-nine out of the 2312 potentially relevant publications met the eligibility *** the 1266 patients with GB cancer included in the publications,706(55.8%) and 560(44.2%) had T1a and T1b GB cancer,*** cholecystectomy for T1a and T1b GB cancer was performed in 590(83.6%) and 375(67.0%) patients,respectively(P<0.01) .In most series,the treatment of choice was simple cholecystectomy for T1a GB cancer patients with a 5-year survival rate of 100%.Lymph node metastasis was detected in 10.9% of the T1b GB cancer patients and in 1.8%of the T1a GB cancer patients,respectively(P<0.01) .Eight patients(1.1%) with T1a GB cancer and 52 patients(9.3%) with T1b GB cancer died of recurrent GB cancer(P<0.01) . CONCLUSION:Simple cholecystectomy represents the adequate treatment of T1a GB *** is no definite evidence that extended cholecystectomy is advantageous over simple cholecystectomy for T1b GB cancer.

关键词： Gallbladder Cancer Cholecystectomy Simple Extended

Application of powdered activated carbon coating to fabrics in a hybrid filter to enhance mercury removal

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2019年第6期31卷 58-65页

作者： Jin-Ho sung Seung-Ki Back eun-Song Lee Ha-Na jang Yong-Chil Seo Youn-Suk Kang Myong-Hwa Lee Department of Environmental Engineering Yonsei University J-E Tech Co. Ltd Department of Environmental Engineering Kangwon National University

Elemental mercury(Hg0) is predominant constituent of flue gas emitted from coal-fired power plants. Adsorption has been considered the best available technology for removal of Hg0 from flue gas. However, adsorbent injection increases the amount of ash generated. In the present study, powdered activated carbon(PAC) was coated on polytetrafluoroethylene/glass fiber filters to increase Hg0 removal while concurrently reducing the amount of ash generated. The optimal PAC coating rate was determined in laboratory experiments to ensure better Hg0 removal with low pressure drop. When PAC of particle size less than 45 μm was used, and the areal density was 50 g/m2, the pressure drop remained under 30 Pa while the Hg0 removal efficiency increased to 15.8% from4.3%. The Hg0 removal efficiency also increased with decrease in filtration velocity. The optimal PAC coating rate was applied on a hybrid filter(HF), which was combined with a bag filter and an electrostatic precipitator in a single chamber. Originally designed to remove fine particulates matter, it was retrofitted to the flue gas control device for simultaneous Hg0 removal. By employing the PAC coating, the Hg removal efficiency of the HF increased to 79.79% from 66.35%. Also, a temporary reduction in Hg removal was seen but this was resolved following a cleaning cycle in which the dust layer was removed.

关键词： Mercury Hybrid filter Activated carbon Coating filter Coal-fired power plant

Gradient Si-and Ti-doped Fe_(2)O_(3) hierarchical homojunction photoanode for efficient solar water splitting:Effect of facile microwave-assisted growth of Si-FeOOH on Ti-FeOOH nanocorals

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2023年第2期77卷 27-37,I0002页

作者： Tae Sik Koh Periyasamy Anushkkaran Weon-Sik Chae Hyun Hwi Lee sun Hee Choi Jum Suk jang Division of Biotechnology College of Environmental and Bioresource SciencesJeonbuk National UniversityIksan 54596Republic of Korea Daegu Center Korea Basic Science InstituteDaegu 41566Republic of Korea Pohang Accelerator Laboratory Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea

The construction of a homojunction is an effective approach for addressing issues such as slow charge separation and charge-transfer kinetics in *** the present work,we designed a gradient Si-and Ti-doped Fe_(2)O_(3) homojunction photoanode to improve the photoelectrochemical(PEC)performance of a Ti-doped Fe_(2)O_(3) ***-FeOOH nanocorals were synthesized using a hydrothermal process,and Si-FeOOH was grown on Ti-FeOOH nanocorals using a rapid and facile microwaveassisted(MW)*** varying the MW irradiation time,the thickness of the Si/Ti:Fe_(2)O_(3) photoanode was adjusted and an optimized 3-Si/Ti:Fe_(2)O_(3) photoelectrode was achieved with a significantly enhanced photocurrent density(1.37 mA cm^(-2) at 1.23 V ***)and a cathodic shift of the onset potential(150 mV)compared with that of bare Ti-Fe_(2)O_(3).This enhanced PEC performance can be ascribed to homojunction formation and Si gradient *** Si dopant increased the donor concentration and the formation of a homojunction improved the intrinsic built-in electric field,thereby promoting charge separation and charge ***,the as-formed homojunction passivated the surfacetrapping states,consequently improving the charge transfer efficiency(60%at 1.23 VRHE)at the photoanode/electrolyte *** findings could pave the way for the microwave-assisted fabrication of diverse efficient homojunction photoanodes for PEC water splitting applications.

关键词： Homojunction Microwave-assisted Hematite Gradient doping PEC water splitting

Association between the early high level of serum tacrolimus and recurrence of hepatocellular carcinoma in ABO-incompatible liver transplantation

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Surgery 2023年第12期15卷 2727-2738页

作者： Ji Won Han Jong Young Choi eun sun Jung Ji Hoon Kim Hee sun Cho Jae-sung Yoo Pil Soo sung Jeong Won jang Seung Kew Yoon Ho Joong Choi Young Kyoung You Department of Internal Medicine The Catholic University of KoreaSeoul 06591South Korea The Catholic University Liver Research Center College of MedicineThe Catholic University of KoreaSeoul 06591South Korea Department of Hospital Pathology The Catholic University of KoreaSeoul 06591South Korea Department of Surgery The Catholic University of KoreaSeoul 06591South Korea

BACKGROUND Clinical factors predicting graft survival(GS)after ABO-incompatible(ABOi)liver transplantation(LT),and differences between recipients with and without hepatocellular carcinoma(HCC)are *** To analyze the impact of serial serum tacrolimus trough concentration in recipients with or without(HCC)in ABOi living-donor liver transplantation(LDLT).METHODS We analyzed a historical cohort of 89 recipients who underwent ABOi LDLT,including 47 patients with *** The 1-,3-,5-,and 10-year GS rates were 85.9%,73.3%,71.4%,and 71.4%,respectively,and there were no significant differences between HCC and non-HCC *** multivariate Coxregression analyses,tacrolimus trough concentrations below 5.4 ng/mL at 24 wk post-LT,in addition to the antibody-mediated rejection(AMR)were associated with poor-graft *** HCC patients,AMR[hazard ratio(HR)=63.20,P7.3 ng/mL were significant predictive factors for HCC *** propensity score matching,patients with high tacrolimus concentrations at 4 wk had significantly poor recurrence-free *** Elevated tacrolimus levels at 4 wk after ABOi LDLT have been found to correlate with HCC ***,careful monitoring and control of tacrolimus levels are imperative in ABOi LT recipients with HCC.

关键词： ABO-incompatible Liver transplantation Tacrolimus Hepatocellular carcinoma

Comparison Between Full-Scale and Model Experiments of Oil Fences

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Ocean Engineering 2009年第4期23卷 657-668页

作者： Tae Ho KIM Duck Jong jang Kyong Uk YANG sun Chol NA Dae An KIM School of Marine Technology Chonnam National UniversityYeosu Department of Maritime Police Science Chonnam National UniversityYeosu Korea Marine Environment Management Corporation

This study examines the performance of an air expansion oil fence system as deployed in two different configurations. Geometric and tension characteristics of the oil fence are investigated for （1） the system attached to two vessels and （2） the system attached to one vessel with spreading devices. Since full-scale testing can be time consuming and expensive, another component of the study was to examine how well models would perform. A scaling technique was developed and a set of experiments were conducted with a 1/20-th scale model of the oil fence in a towing tank facility. Performance resalts from the model tests were compared with those conducted at sea. The tension （N） in the full-scale results were represented by R = avb, where v is the current velocity in m/s and the values for a and b used for comparison purposes. Both sets of full-scale and model tests were conducted with an oil fence opening of 120 m and 160m. In the full-scale experiment with spreading devices attaahed to the forward ends of the oil fence, the horizontal distance of the spreading devices has a tendency to linearly increase as the current velocity increases when the warp length is as short as 50 m, but to linearly decrease as the current velocity increases when the warp length is extended to 100 m and 150 m. The spreading distance at uniform current velocitys in the model test increases as the warp length is extended. While there is no significant difference of spreading distance between the cases of 100 m and 150 m, the spreading distance becomes shorter when the warp length is 50 m.

关键词： oil fence spreading devices tension horizontal distance

Anti-Proliferative Effects of Ginsenosides Extracted from Mountain Ginseng on Lung Cancer

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Integrative Medicine 2016年第5期22卷 344-352页

作者： Dong Gyu Lee sung-ll jang Young-Rang Kim Kyeong eun Yang So Jung Yoon Zee-Won Lee Hyun Joo An Ik-Soon jang Jong-Soon Choi Hwa-Seung Yoo Division of Life Science Korea Basic Science InstituteDaejeon 305-333Korea East-West Cancer Center Dunsan Oriental Hospital of Daejeon UniversityDaejeon 302-122Korea Graduate School of Analytical Science and Technology Chungnam National UniversityDaejeon 305-764Korea

Objective： To investigate the effect of three major ginsenosides from mountain ginseng as anti- cancer substance and explore the underlying mechanism involved in lung cancer. Methods： The inhibitory proliferation of lung cancer by major five ginsenosides （Rbl, Rb2, Rgl, Rc, and Re） was examined using 3-（4,5-dimethylthiazol-2-yl）-2,5-diphenyl tetrazolium bromide assay. Calculated 50% inhibition （IC50） values of five ginsenosides were determined and compared each other. Apoptosis by the treatment of single ginsenoside was performed by fluorescence-assisted cytometric spectroscopy. The alterations of apoptosis-related proteins were evaluated by Western blot analysis. Results： The abundance of ginsenosides in butanol extract of mountain ginseng （BX-MG） was revealed in the order of Rbl, Rgl, Re, Rc and Rb2. Among them, Rbl was the most effective to lung cancer cell, followed by Rb2 and Rgl on the basis of relative IC50 values of IMR90 versus A549 cell. The alterations of apoptotic proteins were confirmed in lung cancer A549 cells according to the administration of Rbl, Rb2 and Rgl. The expression levels of caspase-3 and caspase-8 were increased upon the treatment of three ginsenosides, however, the levels of caspase-9 and anti-apoptotic protein Bax were not changed. Conclusion： Major ginsenosides such as Rbl, Rb2 and Rgl comprising BX-MG induced apoptosis in lung cancer cells via extrinsic apoptotic pathway rather than intrinsic mitochondrial pathway.

关键词： Butanol extract of mountain ginseng ginsenoside lung cancer apoptosis

Oral administration of red ginseng powder fermented with probiotic alleviates the severity of dextran-sulfate sodium-induced colitis in a mouse model

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Natural Medicines 2017年第3期15卷 192-201页

作者： jang sun-Hee PARK Jisang KIM Sae-Hae CHOI Kyung-Min KO eun-Sil CHA Jeong-Dan LEE Young-Ran jang Hyonseok jang Yong-Suk Department of Molecular Biology and Institute for Molecular Biology and Genetics Chonbuk National UniversityJeonju 54896Korea Department of Bioactive Material Sciences and Research Center of Bioactive Materials Chonbuk National UniversityJeonju 54896Korea Department of Efficacy Research Institute of Jinan Red GinsengJinan 55442Korea Department of Mathematics Sogang UniversitySeoul 04107Korea Department of Oral Maxillofacial Surgery Korea University Ansan HospitalAnsan 15355Korea

Red ginseng is a well-known alternative medicine with anti-inflammatory *** exerts pharmacological effects through the transformation of saponin into metabolites by intestinal *** that intestinal microflora vary among individuals,the pharmacological effects of red ginseng likely vary among *** order to produce homogeneously effective red ginseng,we prepared probiotic-fermented red ginseng and evaluated its activity using a dextran sulfate sodium(DSS)-induced colitis model in *** analysis of intestinal damage indicated that the administration of probiotic-fermented red ginseng significantly decreased the severity of colitis,compared with the control and the activity was higher than that induced by oral administration of ginseng powder or probiotics *** analysis of the levels of serum IL-6 and TNF-α,inflammatory biomarkers that are increased at the initiation stage of colitis,were significantly decreased in probiotic-fermented red ginseng-treated groups in comparison to the control *** levels of inflammatory cytokines and mR NAs for inflammatory factors in colorectal tissues were also significantly decreased in probiotic-fermented red ginseng-treated ***,oral administration of probiotic-fermented red ginseng reduced the severity of colitis in a mouse model,suggesting that it can be used as a uniformly effective red ginseng product.

关键词： Colitis Fermentation Inflammation Probiotics Red ginseng