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Comprehensive DNA barcode reference library and optimization of genetic divergence threshold facilitate the exploration of species diversity of green lacewings (Neuroptera: Chrysopidae)

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Insect Science 2024年第2期31卷 613-632页

作者： Yan Lai Kaiyu Li Xingyue Liu Deparment of Entomology Cllege of Plant ProtectionChina Agricultural UniversityBejingChina College of Bioogical Sciencs China Agricultural UniversityBeijingChina

Chrysopidae are a family of Neuroptera of significant importance in biocontrol against agricultural pests because of their predatory ***,the taxonomy of Chrysopidae lacks a comprehensive revision,which impedes the exploration of species diversity as well as the selection and the conservation of green lacewings as biocontrol *** have established a DNA barcode reference library of the Chinese green lacewings based on an approximately complete sampling(95.63%)in 25 of the 34 provincial regions in China,comprising 1119 barcodes of 25 genera and 197 species(representing 85%genera and 43.62%species from China).Combining other 1049 high quality green lacewing DNA barcodes,we first inferred the optimal threshold of interspecific genetic divergence(1.87%)for successful species identification in multiple simulated scenarios based on present *** further inferred the threshold of genetic divergence(7.77%)among genera with biocontrol *** inference and performance of the threshold appears to be mainly associated with the completeness of sampling,the proportion of closely related species,and the analytical *** new combinations,Apertochrysa platypa(Yang&Yang,1991)***.,Apertochrysa shennongana(Yang&Wang,1990)***.,Apertochrysa pictifacialis(Yang,1988)***.,Apertochrysa helana(Yang,1993)***.,Plesiochrysa rosulata(Yang&Yang,2002)***.,and Signochrysa hainana(Yang&Yang,1991),are proposed according to integrative species *** library and optimal threshold will effectively facilitate the exploration of species diversity of green *** study also provides a methodological reference in molecular delimitation of other insects.

关键词： Chrysopidae DNA barcode genetic distance optimal threshold species delimitation

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Perspectives on Compound Flooding in Chinese Estuary Regions

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International Journal of Disaster Risk Science 2023年第2期14卷 269-279页

作者： Hanqing Xu Elisa Ragno Jinkai Tan Alessandro Antonini Jeremy D.Bricker Sebastiaan N.Jonkman Qing Liu Jun Wang Institute of Eco-Chongming(IEC) Key Laboratory of Geographic Information Science of Ministry of Education and School of Geographic SciencesEast China Normal UniversityShanghai200241China Faculty of Civil Engineering and Geosciences Delft University of Technology2628 CNDelftThe Netherlands School of Atmospheric Sciences and Key Laboratory of Tropical Atmosphere-Ocean System of Ministry of Education Sun Yat-sen UniversityZhuhai519082China Department of Civil and Environmental Engineering University of MichiganAnn ArborMI48109USA

Extreme surges and rainfall represent major driving factors for compound flooding in estuary regions along the Chinese *** combined effect of extreme surges and rainfall(that is,compound floods)might lead to greater impacts than if the drivers occurred in ***,understanding the frequency and severity of compound flooding is important for improving flood hazard assessment and compound flood resilience in coastal *** this study,we examined the dependence between extreme surges and corresponding rainfall events in 26 catchments along the Chinese coastline during typhoon and non-typhoon seasons using copula functions,to identify where the two drivers more often occur together and the implication for flood management in these *** found that the interaction between flood drivers is statistically significant in 10catchments located around Hainan Island(south)and Shanghai,where surge peaks occur mainly during the typhoon season and around the Bohai Sea(north),where surge peaks occur mainly during the non-typhoon *** further applied the copula-based framework to model the dependence between surge peaks and associated rainfall and estimate their joint and conditional probability in two specific locations—Hainan Island and the Bohai Sea,where the correlation between flood drivers is statistically *** observed that in Hainan Island where most of the surge peaks occur during the typhoon season,extreme rainfall events during the typhoon season are generally more intense compared to annual maxima *** contrast,around the Bohai Sea where surge peaks occur mainly outside the typhoon season,rainfall is less intense than annual maxima *** results show that the interaction between extreme surges and rainfall can provide valuable insight when designing coastal and urban infrastructure,especially in highly populated urban areas prone to both coastal and pluvial flooding,such as many Chinese coastal cities.

关键词： China Coastal catchments Compound flooding Copula function Extreme surge optimal threshold

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Automatic Airway Deletion in Pulmonary Segmentation

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Journal of Shanghai Jiaotong university(Science) 2005年第2期10卷 190-192页

作者：王平庄天戈 Dept. of Bio-medical Eng. Shanghai Jiaotong Univ. Shanghai 200030 China

A method of removing the airway from pulmonary segmentation image was proposed. This method firstly segments the image into several separate regions based on the optimum threshold and morphological operator, and then each region is labeled and noted with its mean grayscale. Therefore, most of the non-lung regions can be removed according to the tissue’s Hounsfield units (HU) and the imaging modality. Finally, the airway region is recognized and deleted automatically through using the priori information of its HU and size. This proposed method is tested using several clinical images, yielding satisfying results.

关键词： computerized tomography image segmentation optimal threshold

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An Improved Image Enhancement Algorithm

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Wuhan University Journal of Natural Sciences 2017年第1期22卷 85-92页

作者： MA Jing ZOU Chengming JIN Xiaolong Hubei Key Laboratory of Transportation Intemet of Things Wuhan 430070 Hubei China Department of Computer Science and Technology Wuhan University of Technology Wuhan 430070 Hubei China Jiangxi Lanxiang Heavy Industries Company Pingxiang 337000 Jiangxi China Wuhan Road and Bridge Toll Management Center Wuhan 430050 Hubei China

To solve the problems of noise,detail loss and poor contrast in the successive mean quantization transform（SMQT）,a new SMQT algorithm based on Otsu algorithm is *** this algorithm,we integrate the optimal threshold selected by the Otsu algorithm into the SMQT algorithm,then obtain the successive mean quantization of the binary *** this algorithm,an enhanced image is output with a higher *** both subjective visual effect and objective quality evaluation,the experimental results show that the improved algorithm reduces noise,improves contrast and makes the image details more clear.

关键词： successive mean quantization transform (SMQT) Otsu algorithm optimal threshold image enhancement

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Optimization of threshold for local spectrum sensing with energy detector

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Journal of Shanghai University(English Edition) 2011年第2期15卷 132-136页

作者：翟旭平贺海根郑国莘 Key Laboratory of Specialty Fiber Optics and Optical Access Networks School of Communication and Information Engineering Shanghai University

Spectrum sensing is the first step of cognitive radio （CR）. In this area, previous researches mostly consider distributed local nodes which are under identical channel conditions, hence uniform and fixed detection threshold is set with energy detector. However, the distributions of nodes in real environments are not quite the same. In this paper, the optimal threshold to minimize the total detection error over add＇itive white Gaussion noise （AWGN） channel is derived firstly. Then the dynamic threshold scheme is proposed to reduce the average total detection error. Simulations have shown that, with this scheme, sensing performance is improved.

关键词： spectrum sensing energy detector optimal threshold dynamic threshold scheme

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