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| 1 | Detection of serum IgM and IgG for COVID-19 diagnosis显示文摘Dear Editor,Infection with the novel coronavirus(SARS-CoV-2,which is the virus responsible for the coronavirus disease 2019(COVID-19))was first reported in Wuhan,China on December 31,2019.The outbreak of COVID-19 remains ongoing and was linked to more than 80,000 infected patients and more than 3,000 deaths in China as of March 7,2020(Holshue et al.,2020). | Ling Zhong Junlan Chuan Bo Gong Ping Shuai Yu Zhou Yi Zhang Zhilin Jiang Dingding Zhang Xiaoqi Liu Shi Ma Yi Huang He Lin Qingwei Wang Lulin Huang Dan Jiang Fang Hao Juan Tang Chunqi Zheng Hua Yu Zhibin Wang Qi Jiang Tao Zeng Mei Luo Fanwei Zeng Fanxin Zeng Jianghai Liu Junxi Tian Yu Xu Tengxiang Long Kaiju Xu Xingxiang Yang Yuping Liu Yi Shi Li Jiang Zhenglin Yang | 2020 | Science China(Life Sciences)2020，63，5： | 8 |
| 2 | Analyzing Interpretability Semantically via CNN Visualization显示文摘Deep convolutional neural networks are widely used in image recognition,but the black box property is always perplexing.In this paper,a method is proposed using visual annotation to interpret the internal structure of CNN from the semantic perspective.First,filters are screened in the high layers of the CNN.For a certain category,the important filters are selected by their activation values,frequencies and classification contribution.Then,deconvolution is used to visualize the filters,and semantic interpretations of the filters are labelled by referring to the visualized activation region in the original image.Thus,the CNN model is interpreted and analyzed through these filters.Finally,the visualization results of some important filters are shown,and the semantic accuracy of filters are verified with reference to the expert feature image sets.In addition,the results verify the semantic consistency of the same important filters under similar categories,which indicates the stability of semantic annotation of these filters. | Chunqi Qi Yuechen Zhao Yue Wang Yapu Zhao Qian Hong Xiuli Wang Weiyu Guo | 2021 | 国际计算机前沿大会会议论文集2021，，2： | 0 |
| 3 | Short-Term Predictions and LIME-Based Rule Extraction for Standard and Poor’s Index显示文摘In this paper,neural networks is proposed to predict the trend of the S.P.500 index,comparing the effects of different data inputs and model types on the prediction results.Then the model was selected with good interpretation results to use the LIME interpretability algorithm to interpret the prediction results,and extract the prediction rules of the neural network model.It firstly compared three neural networks prediction models,including multi-layer perceptron(MLP),one-dimensional convolutional neural network(1D CNN)and long short-term memory(LSTM),with the price data,continuous technical indicators and discrete technical indicators of different time durations as inputs,and found the model and parameter configuration with good predicting effect for each type of inputs.In another aspect,the data of the first experiment was used,the rules were extracted in the model that predict the rise of the index by the LIME interpretability algorithm,and the rules with high investment utility were finally selected.The experimental result show high precision in predicting the trend of the stock index and high frequency of occurrence,with certain reference value for predicting the short-term index trend. | Chunqi Qi Yue Wang Wenjun Wu Xiuli Wang | 2020 | 国际计算机前沿大会会议论文集2020，，2： | 0 |
| 4 | Chemical Characteristics and Anticoagulant Activities of Two Sulfated Polysaccharides from Enteromorpha linza (Chlorophyta)显示文摘Two sulfated polysaccharides, designated MP and SP, were extracted from the marine green alga Enteromorpha linza using hot water and then purified using ion-exchange and size-exclusion chromatography. The anticoagulant activities of MP and SP were examined by determination of their activated partial thromboplastin time (APTT), thrombin time (TT) and prothrombin time (PT) using human plasma. Results showed that MP and SP were composed of abundant rhamnose with small amounts of xylose and glucuronic acid, whereas SP also contained a small amount of galactose. Approximate molecular weights of MP and SP were 535 and 502 kDa, respectively. As compared with SP, MP had higher contents of sulfate ester (19.0%) and uronic acid (14.9%). The MP mainly consisted of (1→4)-linked rhamnose residues with partially sulfated groups at the C-3 position, and small amounts of (1→3, 4)-linked rhamnose, (1→2, 4)-linked rhamnose, (1→4)-linked glucuronic acid and (1→4)-linked xylose residues. The SP contained abundant (1→4)-linked rhamnose with minor amounts of (1→3)-linked rhamnose, (1→3, 4)-linked rhamnose, (1→2, 4)-linked rhamnose, (1→4)-linked glucuronic acid, (1→4)-linked xylose, and (1→3)-linked galactose residues. The sulfate groups were mainly located at C-3 of (1→4)-linked rhamnose residues. Both MP and SP, in particular the former, effectively prolonged APTT and TT. This work demonstrates that MP and SP have unique structural characteristics distinct from those of other sulfated polysaccharides from Enteromorpha. The MP is a potential source of anticoagulant, and the difference in anticoagulant activities of the two sulfated polysaccharides is directly linked to the discrepancy of their chemical features. | QI Xiaohui MAO Wenjun CHEN Yin CHEN Yanli ZHAO Chunqi LI Na WANG Chunyan | 2013 | Journal of Ocean University of China2013，12，1： | 0 |
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