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| 1 | Quantifying the effects of long-term news on stock markets on the basis of the multikernel Hawkes process显示文摘Recent studies have revealed that long-term financial news can affect stock markets. However,previous research mainly focuses on modeling the short-term effects of financial news and suffers from the weak ability of quantifying the time-decaying influence of financial news. To fill this gap, this study introduces the Hawkes process to estimate the time-decaying influence of long-term financial news. However, the performance of the conventional Hawkes process is sensitive to the choice of kernel functions. Hence, we propose a novel multikernel-powered Hawkes process framework, which uses multiple kernels to model different time-decaying rates, thus alleviating the instability of our proposed Hawkes process based prediction model.Experimental results show that the proposed framework yields state-of-the-art stock market prediction accuracies on 515 listed companies and gains more profits in market trading simulation compared with baseline methods. News-based stock prediction can complement studies on price-volume-based stock prediction. | Xiao DING Jihao SHI Junwen DUAN Bing QIN Ting LIU | 2021 | Science China(Information Sciences)2021，64，9： | 4 |
| 2 | Endoscopic management of iatrogenic gastrointestinal perforations显示文摘Iatrogenic perforation(IP)is a rare but severe complication of endoscopy,and occurrences grow with the expansion of interventional endoscopy.Apart from symptoms and physical signs,CT scans provide an immediate and comprehensive diagnosis of IP and its severity.The general treatment is broad-spectrum antibiotics,intravenous nutrition,and close monitoring.Endoscopic treatments are considered as the first-line therapy.Endoclips are usually utilized for small perforations,while endoclips with endoloops and over the scope clip system are preferred for large ones.Covered self-expandable metal stents are effective for esophageal perforations.Fibrin glue and band ligation can be attempted,when the location of perforation is difficult for the clip placement.Close observation is required after the procedure.If endoscopic closure fails or deterioration occurs,surgical treatments should be requested. | Kan Wang Jihao Shi Linna Ye | 2019 | Laparoscopic, Endoscopic and Robotic Surgery2019，2，2： | 0 |
| 3 | A New Capacitance Probe for Measuring the Local Moisture Content in Wet Porous Media显示文摘A new capacitance probe is developed for measuring local moisture content in wet porous media. The measurement principle, sensor structure of the probe, dynamic response characteristics and calibration procedure are discussed in detail. The experimental results show that the probe can be used to measure the local moisture content in wet porous media. | Han Jitian Wang Jihao Gong Weiping (Depart. of Power Engineering, Shandong University of Technology, Jinan 250014)Shi Mingheng Gui Keting (Depart. of Power Engineering, Southeast University, Nanjing 210096) | 1997 | Journal of Thermal Science1997，6，3： | 0 |
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