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RISS 인기검색어
- 검색키워드
- 저자 : Zhang Shutian (검색결과 2 건)
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RSVRs based on Feature Extraction: A Novel Method for Prediction of Construction Projects’ Costs
Ying Zhang,Shutian Fang 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.4
The construction industry is an important basis for the development of China's economy. The accurate prediction of the cost of the project determines the profitability of the project and the decision-making of the construction. Therefore, this paper combines Random Forest with Support Vector Regression, and puts forward a method of construction cost prediction based on this method which we call it Random Support Vector Regressions (RSVRs). In this paper, 22 kinds of features which are related to cost are extracted, then we use Kernel Principal Component Analysis to fuse features which are less relevant to the cost. Then 11-dimensional features are put into RSVRs for modeling. From the theoretical point of view, RSVRs gives a novel work flow that is fusing features with low correlation firstly and then performing regression. In order to avoid the defects of the regression method, the two methods are fused, so that each method can maximize its advantages and make up for the disadvantages of the other method. From a practical point of view, RSVRs can be used to predict the project cost, which not only improves the accuracy, but also immediately obtains thepredicted result. As long as the appropriate training data is selected, the method can predict the cost of any area and any building.
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Bai Liyi,Jiang Wei,Cheng Rui,Dang Yan,Min Li,Zhang Shutian 거트앤리버 소화기연관학회협의회 2023 Gut and Liver Vol.17 No.4
Background/Aims: In patients with acute nonvariceal upper gastrointestinal bleeding (ANVUGIB), the optimal timing of endoscopy is still a matter of dispute. We conducted a systematic review and meta-analysis to determine the clinical benefit of early endoscopy. Methods: A literature search of the MEDLINE, Embase, and Cochrane databases was conducted to identify publications from inception to March 1, 2022. Eligible studies included observational cohort studies and randomized controlled trials that reported clinical outcomes of endoscopy in patients with ANVUGIB. ANVUGIB patients who underwent endoscopy within 24 hours of admission were considered to have had an early endoscopy. The primary outcome was the mortality rate in ANVUGIB patients who had early or nonearly endoscopy. Results: The final analysis included five randomized controlled studies (RCTs) and 20 observational studies from the 1,206 identified articles. The mortality rate was not significantly reduced among patients who received endoscopy performed within 24 hours, whether in cohort studies nor in RCTs. For subgroup analysis, a higher mortality rate was found only among patients who received very early endoscopy within 12 hours (odds ratio, 1.66; p<0.001, I2=0) in cohort studies. No significant difference in mortality rates was found among patients at high risk of bleeding who received early versus nonearly endoscopy. Conclusions: Early endoscopy within 24 hours does not appear to significantly reduce the mortality rates of patients with ANVUGIB. Further well-designed studies are warranted to address if very early endoscopy within 12 hours can provide a clinical benefit for patients at high risk of bleeding.
KCI
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