125 results on '"Qiao, Wan"'
Search Results
2. Discovering urban mobility structure: a spatio-temporal representational learning approach
- Author
-
Xiaoqi Duan, Tong Zhang, Zhibang Xu, Qiao Wan, Jinbiao Yan, Wangshu Wang, and Youliang Tian
- Subjects
urban mobility structure ,representational learning ,individual travel ,spatio-temporal heterogeneity ,Mathematical geography. Cartography ,GA1-1776 - Abstract
The urban mobility structure is a summary of individual movement patterns and the interaction between persons and the urban environment, which is extremely important for urban management and public transportation route planning. The majority of current research on urban mobility structure discovery utilizes the urban environment as a static network to detect the relationship between people groups and urban areas, ignoring the vital problem of how individuals affect urban mobility structure dynamically. In this paper, we propose a spatio-temporal representational learning method based on reinforcement learning for discovering urban mobility structures, in which the model can effectively consider the interaction knowledge graph of individuals with stations while accounting for the spatio-temporal heterogeneity of individual travel. The experimental results demonstrate the advantages of individual travel-based urban mobility structure discovery research in describing the interaction between individuals and urban areas, which can account for the intrinsic influence more thoroughly.
- Published
- 2023
- Full Text
- View/download PDF
3. Fault diagnosis of planetary gearboxes under variable operating conditions based on AWM-TCN
- Author
-
Huang, Jinpeng, Wu, Guoxin, Liu, Xiuli, Bu, Minzhong, and Qiao, Wan
- Published
- 2024
- Full Text
- View/download PDF
4. Alkynyl-anchored silver nanoclusters in lanthanide metal-organic framework for luminescent thermometer and CO2 cycloaddition
- Author
-
Hu, Jing-Wen, Qiao, Wan-Zhen, Sun, Jun-Jun, Xu, Jun, Dong, Xi-Yan, Zhang, Chong, and Zang, Shuang-Quan
- Published
- 2023
- Full Text
- View/download PDF
5. Aspect Ratio-Based Bidirectional Label Encoding for Square-Like Rotation Detection.
- Author
-
Zhifeng Xiao, Bin Xu, Yeting Zhang, Kai Wang, Qiao Wan, and Xiaowei Tan
- Published
- 2023
- Full Text
- View/download PDF
6. Learnable Loss Balancing in Anchor-Free Oriented Detectors for Aerial Object.
- Author
-
Kai Wang, Zhifeng Xiao, Qiao Wan, Xiaowei Tan, and Deren Li
- Published
- 2023
- Full Text
- View/download PDF
7. New progress in diagnosis and treatment of pulmonary arterial hypertension
- Author
-
Zai-qiang Zhang, Sheng-kui Zhu, Man Wang, Xin-an Wang, Xiao-hong Tong, Jian-qiao Wan, and Jia-wang Ding
- Subjects
Pulmonary arterial hypertension (PAH) ,Pathophysiology ,Biomarker ,Genetic ,Surgery ,RD1-811 ,Anesthesiology ,RD78.3-87.3 - Abstract
Abstract Pulmonary arterial hypertension (PAH) is a progressive disease. Although great progress has been made in its diagnosis and treatment in recent years, its mortality rate is still very significant. The pathophysiology and pathogenesis of PAH are complex and involve endothelial dysfunction, chronic inflammation, smooth muscle cell proliferation, pulmonary arteriole occlusion, antiapoptosis and pulmonary vascular remodeling. These factors will accelerate the progression of the disease, leading to poor prognosis. Therefore, accurate etiological diagnosis, treatment and prognosis judgment are particularly important. Here, we systematically review the pathophysiology, diagnosis, genetics, prognosis and treatment of PAH.
- Published
- 2022
- Full Text
- View/download PDF
8. Integrating Homogeneous and Heterogeneous Catalysis in a Copper Nanocluster with Lewis Acid–Base Sites for Chemical Conversion of CO 2 and Propargylamine
- Author
-
Qiao, Wan-Zhen, primary, Wang, Yu-Jue, additional, Li, Si, additional, Wang, Rui, additional, Wu, Jie, additional, and Zang, Shuang-Quan, additional
- Published
- 2024
- Full Text
- View/download PDF
9. Transformer-Driven Semantic Relation Inference for Multilabel Classification of High-Resolution Remote Sensing Images.
- Author
-
Xiaowei Tan, Zhifeng Xiao, Jianjun Zhu, Qiao Wan, Kai Wang, and Deren Li
- Published
- 2022
- Full Text
- View/download PDF
10. Effectiveness and Safety of Tourniquet Application Strategies in Total Knee Arthroplasty: a Meta-analysis
- Author
-
He, Yi-Xiang, Qiao, Wan-Jia, Zhao, Yu-Hao, Gao, Zhao, and Wang, Wen-Ji
- Published
- 2021
- Full Text
- View/download PDF
11. Scale Sensitive Neural Network for Road Segmentation in High-Resolution Remote Sensing Images.
- Author
-
Xiaowei Tan, Zhifeng Xiao, Qiao Wan, and Weiping Shao
- Published
- 2021
- Full Text
- View/download PDF
12. Cooperation between microporous frameworks and micron-sized channel in crystals for excellent chromate removal
- Author
-
Qiao, Wan-Zhen, Yang, Guo-Li, Zhu, Zi-Hao, Xu, Hang, and Zhao, Bin
- Published
- 2021
- Full Text
- View/download PDF
13. Simulating Human Host Interventions to Control Intra-urban Dengue Outbreaks with a Spatially Individual-based Model.
- Author
-
Qiao Wan, Ling Yin, Liang Mao, Li Wang, Shujiang Mei, Qinglan Li, and Kang Liu 0010
- Published
- 2019
- Full Text
- View/download PDF
14. Self-Calibrated Multi-Floor Localization Based on Wi-Fi Ranging/Crowdsourced Fingerprinting and Low-Cost Sensors
- Author
-
Qiao Wan, Xiaoqi Duan, Yue Yu, Ruizhi Chen, and Liang Chen
- Subjects
indoor localization ,Wi-Fi ranging ,crowdsourced fingerprinting ,low-cost sensors ,deep-learning ,Science - Abstract
Crowdsourced localization using geo-spatial big data has become an effective approach for constructing smart-city-based location services with the fast growing number of Internet of Things terminals. This paper presents a self-calibrated multi-floor indoor positioning framework using a combination of Wi-Fi ranging, crowdsourced fingerprinting and low-cost sensors (SM-WRFS). The localization parameters, such as heading and altitude biases, step-length scale factor, and Wi-Fi ranging bias are autonomously calibrated to provide a more accurate forward 3D localization performance. In addition, the backward smoothing algorithm and a novel deep-learning model are applied in order to construct an autonomous and efficient crowdsourced Wi-Fi fingerprinting database using the detected quick response (QR) code-based landmarks. Finally, the adaptive extended Kalman filter is adopted to combine the corresponding location sources using different integration models to provide a precise multi-source fusion based multi-floor indoor localization performance. The real-world experiments demonstrate that the presented SM-WRFS is proven to realize precise 3D indoor positioning under different environments, and the meter-level positioning accuracy can be acquired in Wi-Fi ranging supported indoor areas.
- Published
- 2022
- Full Text
- View/download PDF
15. Map-Assisted 3D Indoor Localization Using Crowd-Sensing-Based Trajectory Data and Error Ellipse-Enhanced Fusion
- Author
-
Qiao Wan, Yue Yu, Ruizhi Chen, and Liang Chen
- Subjects
crowd-sensing ,walking speed estimator ,fingerprinting database ,floor identification ,error ellipse ,Science - Abstract
Crowd-sensing-based localization is regarded as an effective method for providing indoor location-based services in large-scale urban areas. The performance of the crowd-sensing approach is subject to the poor accuracy of collected daily-life trajectories and the efficient combination of different location sources and indoor maps. This paper proposes a robust map-assisted 3D Indoor localization framework using crowd-sensing-based trajectory data and error ellipse-enhanced fusion (ML-CTEF). In the off-line phase, novel inertial odometry which contains the combination of 1D-convolutional neural networks (1D-CNN) and Bi-directional Long Short-Term Memory (Bi-LSTM)-based walking speed estimator is proposed for accurate crowd-sensing trajectories data pre-processing under different handheld modes. The Bi-LSTM network is further applied for floor identification, and the indoor network matching algorithm is adopted for the generation of fingerprinting database without pain. In the online phase, an error ellipse-assisted particle filter is proposed for the intelligent integration of inertial odometry, crowdsourced Wi-Fi fingerprinting, and indoor map information. The experimental results prove that the proposed ML-CTEF realizes autonomous and precise 3D indoor localization performance under complex and large-scale indoor environments; the estimated average positioning error is within 1.01 m in a multi-floor contained indoor building.
- Published
- 2022
- Full Text
- View/download PDF
16. Object Localization in Weakly Labeled Remote Sensing Images Based on Deep Convolutional Features
- Author
-
Yang Long, Xiaofang Zhai, Qiao Wan, and Xiaowei Tan
- Subjects
object localization ,weakly supervised learning (WSL) ,deep convolutional features ,remote sensing images ,Science - Abstract
Object recognition, as one of the most fundamental and challenging problems in high-resolution remote sensing image interpretation, has received increasing attention in recent years. However, most conventional object recognition pipelines aim to recognize instances with bounding boxes in a supervised learning strategy, which require intensive and manual labor for instance annotation creation. In this paper, we propose a weakly supervised learning method to alleviate this problem. The core idea of our method is to recognize multiple objects in an image using only image-level semantic labels and indicate the recognized objects with location points instead of box extent. Specifically, a deep convolutional neural network is first trained to perform semantic scene classification, of which the result is employed for the categorical determination of objects in an image. Then, by back-propagating the categorical feature from the fully connected layer to the deep convolutional layer, the categorical and spatial information of an image are combined to obtain an object discriminative localization map, which can effectively indicate the salient regions of objects. Next, a dynamic updating method of local response extremum is proposed to further determine the locations of objects in an image. Finally, extensive experiments are conducted to localize aircraft and oiltanks in remote sensing images based on different convolutional neural networks. Experimental results show that the proposed method outperforms the-state-of-the-art methods, achieving the precision, recall, and F1-score at 94.50%, 88.79%, and 91.56% for aircraft localization and 89.12%, 83.04%, and 85.97% for oiltank localization, respectively. We hope that our work could serve as a basic reference for remote sensing object localization via a weakly supervised strategy and provide new opportunities for further research.
- Published
- 2022
- Full Text
- View/download PDF
17. Analysis of cardiovascular disease factors on SARS-CoV-2 infection severity
- Author
-
Jian-qiao Wan, Sheng-kui Zhu, Jia-wang Ding, Xiao-Hong Tong, Xin-an Wang, Man Wang, and Zai-Qiang Zhang
- Subjects
Interleukin-6 ,SARS-CoV-2 ,business.industry ,Severe clinical complications ,Cardiovascular disease (CVD) ,COVID-19 ,General Medicine ,Virology ,Article ,Coronavirus disease 2019 (COVID-19) ,Diabetes Mellitus, Type 2 ,Cardiovascular Diseases ,Myocardial injury ,Humans ,Medicine ,business ,Retrospective Studies - Abstract
At present, COVID-19 is a global pandemic and is seriously harmful to humans. In this retrospective study, the aim was to investigate the interaction between CVD and COVID-19.A total of 180 patients diagnosed with COVID-19 in Yichang Central People's Hospital from 29 January to 17 March 2020 were initially included. The medical history, clinical manifestations at the time of admission, laboratory test results, hospitalization time and complications were recorded. According to the medical history, the patients were assigned to the nonsevere group with non-CVD (In the severe group, compared with non-CVD patients, CVD patients had a significantly higher incidence of fever (CVD affects the severity of COVID-19. COVID-19 also increases the risk of severe CVD.La infección por SARS-CoV-2 está provocando graves consecuencias en la humanidad. El objetivo de este estudio retrospectivo fue investigar el impacto de las enfermedades cardiovasculares (ECV) en la gravedad de dicha infección.Entre el 29 de enero y el 17 de marzo de 2020, se diagnosticaron 180 pacientes con neumonía por SARS-CoV-2 en el Hospital Popular Central de Yichang. Se registraron los antecedentes, manifestaciones clínicas, resultados de laboratorio, tiempo de hospitalización y complicaciones. Los pacientes se dividieron en cuatro grupos: 1) infección no grave sin ECV (n = 90), 2) infección no grave con ECV (n = 22), 3) infección grave sin ECV (n = 40) y 4) infección grave con ECV (n = 28).La prevalencia de fiebre en los pacientes con ECV fue significativamente mayor que en aquellos sin ECV (P 0,05). Sin embargo, en comparación con los pacientes no graves, la proporción de pacientes con hipertensión, diabetes mellitus tipo 2, cardiopatía coronaria e insuficiencia cardíaca en los pacientes graves fue significativamente mayor (p 0,05). Los niveles de recuento de leucocitos, IL-6, PCR, dímero D, NT-proBNP y glucemia en ayunas (GA) en pacientes con ECV fueron significativamente mayores que en los de pacientes sin ECV, aunque los niveles de Hb fueron significativamente menores que los de los pacientes sin ECV (p 0,05). Sin embargo, los valores de NT-proBNP en pacientes con ECV fueron significativamente mayores que en los pacientes sin ECV (P 0,05). Además, el recuento de leucocitos y los niveles de IL-6, PCR, dímero D, CK-MB, ALT, AST, creatinina, NT-proBNPy GA en el grupo de pacientes graves fueron significativamente mayores que en el grupo no grave, mientras que los valores de Hb fueron significativamente menores que en el grupo no grave (p 0,05). La prevalencia de lesión miocárdica aguda, lesión renal aguda, arritmia y muerte súbita en el grupo con ECV fue significativamente mayor que en el grupo sin ECV (p 0,05). Los mismos resultados se encontraron al comparar los pacientes no graves con aquellos con infección grave. Entre los pacientes no graves, la duración media de la estancia hospitalaria fue de 25,25 (DE: 7,61) días en los pacientes sin ECV, mientras que la duración media de la estancia hospitalaria fue de 28,77 (DE: 6,11) días en los pacientes con ECV (p 0,05). Los mismos resultados se observaron al comparar los dos grupos con infección grave.La infección por SARS-CoV-2 es de evolución más grave en los pacientes con ECV.
- Published
- 2022
18. A fuel-efficient reliable path finding algorithm in stochastic networks under spatial correlation
- Author
-
Wenxin Teng, Yi Zhang, Xuan-Yan Chen, Xiaoqi Duan, Qiao Wan, and Yue Yu
- Subjects
Fuel Technology ,General Chemical Engineering ,Organic Chemistry ,Energy Engineering and Power Technology - Published
- 2023
19. A2S-Det: Efficiency Anchor Matching in Aerial Image Oriented Object Detection.
- Author
-
Zhifeng Xiao, Kai Wang, Qiao Wan, Xiaowei Tan, Chuan Xu, and Fanfan Xia
- Published
- 2021
- Full Text
- View/download PDF
20. Alkynyl-anchored silver nanoclusters in lanthanide metal-organic framework for luminescent thermometer and CO2 cycloaddition
- Author
-
Hu, Jing-Wen, primary, Qiao, Wan-Zhen, additional, Sun, Jun-Jun, additional, Xu, Jun, additional, Dong, Xi-Yan, additional, Zhang, Chong, additional, and Zang, Shuang-Quan, additional
- Published
- 2022
- Full Text
- View/download PDF
21. A2S-Det: Efficiency Anchor Matching in Aerial Image Oriented Object Detection
- Author
-
Zhifeng Xiao, Kai Wang, Qiao Wan, Xiaowei Tan, Chuan Xu, and Fanfan Xia
- Subjects
aerial image ,rotation object detection ,anchor-based ,anchor selection ,Science - Abstract
Object detection is a challenging task in aerial images, where many objects have large aspect ratios and are densely arranged. Most anchor-based rotating detectors assign anchors for ground-truth objects by a fixed restriction of the rotation Intersection-over-Unit (IoU) between anchors and objects, which directly follow horizontal detectors. Due to many directional objects with a large aspect ratio, the object-anchor IoU is heavily influenced by the angle, which may cause few anchors assigned for some ground-truth objects. In this study, we propose an anchor selection method based on sample balance assigning anchors adaptively, which we name the Self-Adaptive Anchor Selection (A2S-Det) method. For each ground-truth object, A2S-Det selects a set of candidate anchors by horizontal IoU. Then, an adaptive threshold module is adopted on the set of candidate anchors, which calculates a boundary of these candidate anchors aiming to keep a balance between positive and negative anchors. In addition, we propose a coordinate regression of relative reference (CR3) module to precisely regress the rotating bounding box. We test our method on a public aerial image dataset, and prove better performance than many other one-stage detectors and two-stage detectors, achieving the mAP of 70.64. An efficiency anchor matching method helps the detector achieve better performance for objects with large aspect ratios.
- Published
- 2020
- Full Text
- View/download PDF
22. Building Topological Flow-path Networks based on scale-adaptive DEM.
- Author
-
Yumin Chen, Xiaomei Bi, Yajuan Li, and Qiao Wan
- Published
- 2013
- Full Text
- View/download PDF
23. Scale Sensitive Neural Network for Road Segmentation in High-Resolution Remote Sensing Images
- Author
-
Weiping Shao, Zhifeng Xiao, Xiaowei Tan, and Qiao Wan
- Subjects
Artificial neural network ,Scale (ratio) ,Computer science ,business.industry ,Deep learning ,ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION ,0211 other engineering and technologies ,02 engineering and technology ,Image segmentation ,Geotechnical Engineering and Engineering Geology ,Convolutional neural network ,Feature (computer vision) ,Segmentation ,Artificial intelligence ,Electrical and Electronic Engineering ,business ,Encoder ,Image resolution ,021101 geological & geomatics engineering ,Remote sensing - Abstract
Road segmentation in remote sensing images has been widely used in many fields. Semantic segmentation, based on deep learning, has become a hot topic for road segmentation. With the deepening of convolutional neural network (CNN) structures, features in the convolution layer that has more semantic information become more important for road segmentation. However, the spatial resolution of the convolutional layer reduced as the CNN network deepens, which causes the extracted roads to lose some important location information. To solve this problem, this letter proposes a novel end-to-end road segmentation method to effectively utilize the different levels of convolutional layers to enhance the model’s ability to precisely perceive road edges and shapes. The model includes an encoder and a decoder. The encoder encodes the image to obtain the features of different levels and scales. The decoder consists of two modules: scale fusion module and scale sensitive module. In the scale fusion module, features in pooling layers of different scales are fused to obtain a fusion feature. In a scale sensitive module, a weight tensor at the end of the network is learned to evaluate the importance of fusion features. This road segmentation network has been experimentally verified using public data sets, which greatly improves the road segmentation accuracy and achieves good performance.
- Published
- 2021
24. Alkynyl-anchored silver nanoclusters in lanthanide metal-organic framework for luminescent thermometer and CO2 cycloaddition.
- Author
-
Hu, Jing-Wen, Qiao, Wan-Zhen, Sun, Jun-Jun, Xu, Jun, Dong, Xi-Yan, Zhang, Chong, and Zang, Shuang-Quan
- Subjects
METAL-organic frameworks ,RARE earth metals ,DUAL fluorescence ,RING formation (Chemistry) ,THERMOMETERS ,SILVER - Abstract
In this study, an alkynyl-modified aromatic dicarboxylic acid bifunctional ligand was selected to construct lanthanide compound {[Eu
4 (ebdc)6 (4,4-bpy)0.5 (H2 O)4.5 ]·(C2 H5 OH)1.25 (H2 O)}n (Eu-MOF, H2 ebdc = 5-ethynyl-isophthalic acid, 4,4-bpy = 4,4-bipyridine, and MOF = metal-organic framework), of which the uncoordinated alkynyl group would be used to anchor silver nanoclusters (Ag NCs). The Eu-MOF exhibits double emission peaks, located at 492 and 611 nm, respectively, in which the high-energy blue emission is associated with alkynyl-modified ligand while the low-energy red emission belongs to characteristic emission of Eu3+ , indicating that ligands can effectively sensitize Eu3+ luminescence. The intensity ratio of the dual emission fluorescence peaks of Eu-MOF displays a good linear relationship with temperature, which realizes the detection function in the low temperature region of 75–275 K, and the thermal sensitivity reaches 1.5398%·K−1 . After anchoring the Ag NCs, the high-energy blue emission is significantly quenched, indicating that the Ag NCs are indeed confined into the framework and interact with the alkynyl group, and thus change the overall electronic distribution. This is the first case of anchoring Ag NCs by a luminescent Eu-MOF and studying nanocluster loading by using spectroscopic properties. In addition, the Ag NCs@Eu-MOF also shows a good catalytic activity for cycloaddition reaction from CO2 and epoxides. This study not only provides ideas for exploring the changes in optical properties of luminescent MOFs and Ag NCs caused by confinement effect, but also expands their potential applications in various fields. [ABSTRACT FROM AUTHOR]- Published
- 2023
- Full Text
- View/download PDF
25. Cobalt(II) phthalocyanine-sensitized hollow Fe3O4@SiO2@TiO2 hierarchical nanostructures: Fabrication and enhanced photocatalytic properties
- Author
-
Wu, Song-Hai, Wu, Jing-Long, Jia, Shao-Yi, Chang, Qiao-Wan, Ren, Hai-Tao, and Liu, Yong
- Published
- 2013
- Full Text
- View/download PDF
26. Stability evaluation of reference genes for gene expression analysis by RT-qPCR in soybean under different conditions.
- Author
-
Qiao Wan, Shuilian Chen, Zhihui Shan, Zhonglu Yang, Limiao Chen, Chanjuan Zhang, Songli Yuan, Qinnan Hao, Xiaojuan Zhang, Dezhen Qiu, Haifeng Chen, and Xinan Zhou
- Subjects
Medicine ,Science - Abstract
Real-time quantitative reverse transcription PCR is a sensitive and widely used technique to quantify gene expression. To achieve a reliable result, appropriate reference genes are highly required for normalization of transcripts in different samples. In this study, 9 previously published reference genes (60S, Fbox, ELF1A, ELF1B, ACT11, TUA5, UBC4, G6PD, CYP2) of soybean [Glycine max (L.) Merr.] were selected. The expression stability of the 9 genes was evaluated under conditions of biotic stress caused by infection with soybean mosaic virus, nitrogen stress, across different cultivars and developmental stages. ΔCt and geNorm algorithms were used to evaluate and rank the expression stability of the 9 reference genes. Results obtained from two algorithms showed high consistency. Moreover, results of pairwise variation showed that two reference genes were sufficient to normalize the expression levels of target genes under each experimental setting. For virus infection, ELF1A and ELF1B were the most stable reference genes for accurate normalization. For different developmental stages, Fbox and G6PD had the highest expression stability between two soybean cultivars (Tanlong No. 1 and Tanlong No. 2). ELF1B and ACT11 were identified as the most stably expressed reference genes both under nitrogen stress and among different cultivars. The results showed that none of the candidate reference genes were uniformly expressed at different conditions, and selecting appropriate reference genes was pivotal for gene expression studies with particular condition and tissue. The most stable combination of genes identified in this study will help to achieve more accurate and reliable results in a wide variety of samples in soybean.
- Published
- 2017
- Full Text
- View/download PDF
27. Changes in digestive enzyme activities during larval development of Chinese loach Paramisgurnus dabryanus (Dabry de Thiersant, 1872)
- Author
-
Zhang, Yun-Long, Wu, Qiao-Wan, Hu, Wei-Hua, Wang, Fan, Zhao, Zhong-Bo, He, Hui, Shao, Wei-Han, and Fan, Qi-Xue
- Published
- 2015
- Full Text
- View/download PDF
28. Improving emergency evacuation planning with mobile phone location data
- Author
-
Hao Zhang, Jie Chen, Jinxing Hu, Ling Yin, Li Ning, Qiao Wan, Yu Qi, and Zhile Yang
- Subjects
Agent-based model ,Location data ,Emergency management ,Computer science ,business.industry ,05 social sciences ,Geography, Planning and Development ,0211 other engineering and technologies ,0507 social and economic geography ,021107 urban & regional planning ,02 engineering and technology ,Management, Monitoring, Policy and Law ,medicine.disease ,Urban Studies ,Knowledge base ,Mobile phone ,Architecture ,Emergency evacuation ,medicine ,Medical emergency ,business ,050703 geography ,Nature and Landscape Conservation - Abstract
Timely responses to emergencies are critical for urban disaster and emergency management, particularly in densely populated mega-cities. Researchers and personnel involved in urban emergency management nowadays rely on computers to carry out complex evacuation planning. Agent-based modeling, which supports the representation of interactions among individuals and between individuals and their environments, has become a major approach to simulating evacuations wherein spatial–temporal dynamics and individual conditions need attention, such as congestion in urban areas. However, the development of optimal evacuation plans based upon agent-based evacuation simulations can be very time-consuming. In this study, to shorten the computation time to provide a timely response in an efficient way, we develop a knowledge database to store evacuation plans for typical population distributions generated by mobile phone location data. Subsequently, we use the prepared knowledge database (offline) to accelerate real-time (online) processes in searching for near-optimal evacuation plans. Our experimental result demonstrates that the evacuation plans generated with a knowledge database always outperform those that are generated without a knowledge database. Specifically, the knowledge database can reduce the computation time by an average of 96.76%, with an average fitness value improvement of 21.86%. This result confirms the effectiveness of our proposed approach in improving agent-based evacuation planning. With the rapid development of human sensor data collection and analysis, the estimation of a more accurate population distribution will become easier in future. Thus, we believe that the proposed approach of developing a knowledge database based on population distribution patterns will provide a more feasible alternative solution for evacuation planning in the practice of urban emergency management.
- Published
- 2019
29. A scalable ASIP for BP Polar decoding with multiple code lengths
- Author
-
Qiao Wan and Liu Dake
- Subjects
Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
In this paper, we propose a flexible scalable BP Polar decoding application-specific instruction set processor (PASIP) that supports multiple code lengths (64 to 4096) and any code rates. High throughputs and sufficient programmability are achieved by the single-instruction-multiple-data (SIMD) based architecture and specially designed Polar decoding acceleration instructions. The synthesis result using 65 nm CMOS technology shows that the total area of PASIP is 2.71 mm2. PASIP provides the maximum throughput of 1563 Mbps (for N = 1024) at the work frequency of 400MHz. The comparison with state-of-art Polar decoders reveals PASIP’s high area efficiency.
- Published
- 2018
- Full Text
- View/download PDF
30. Incidence and Characteristics of Co-infection and Secondary Infection in Patients with COVID-19
- Author
-
Yingyi Guo, Jiuxin Qu, Lingling Cheng, Xiaohe Li, Ningjing Liu, Tungngai Li, Ying Jiang, Qiao Wan, Chuyue Zhuo, Shunian Xiao, Baomo Liu, Yan Chen, lin Fu, Zhixu Chen, Mingcong Ma, Chao zhuo, and Nanshan Zhong
- Subjects
medicine.medical_specialty ,business.industry ,medicine.drug_class ,Secondary infection ,Incidence (epidemiology) ,Urinary system ,Antibiotics ,medicine.disease_cause ,Internal medicine ,Epidemiology ,Streptococcus pneumoniae ,Etiology ,Medicine ,business ,Cohort study - Abstract
ObjectiveThe etiology and epidemiology of co-infection and secondary infection in COVID-19 patients remain unknown. The study aims to investigate the occurrence and characteristics of co-infection and secondary infection in COVID-19 patients, mainly focusing on Streptococcus pneumoniae co-infections.MethodsThis study was a prospective, observational cohort study of the inpatients diagnosed with COVID-19 in two designated hospitals in south China enrolled between Jan 11 and Feb 22, 2020. The urine specimen was collected on admission and applied for pneumococcal urinary antigen tests (PUATs). Demographic, clinical and microbiological data of patients were recorded simultaneously.ResultA total of 146 patients with a confirm diagnosis of COVID-19 at the median age of 50.0 years (IQR 36.0-61.0) were enrolled, in which, 16 (11.0%) were classified as severe cases and 130 (89.0%) as non-severe cases. Of the enrolled patients, only 3 (2.1%) were considered to present the co-infection, in which 1 was co-infected with S.pneumoniae, 1 with B. Ovatus infection and the other one with Influenza A virus infection. Secondary infection occurred in 16 patients, with S. maltophilia as the most commonly isolated pathogen (43.8%), followed by P. aeruginosa (25.0%), E. aerogenes (25.0%), C. parapsilosis (25.0%) and A. fumigates (18.8%).ConclusionPatients with confirmed COVID-19 were rarely co-infected with Streptococcus pneumoniae or other pathogens, indicating that the application of antibiotics against CAP on admission may not be necessary in the treatment of COVID-19 cases.
- Published
- 2021
31. QFEC ASIP: A Flexible Quad-Mode FEC ASIP for Polar, LDPC, Turbo, and Convolutional Code Decoding
- Author
-
Dake Liu, Liu Shaohan, and Qiao Wan
- Subjects
Multimode application-specific instruction-set processor (ASIP) ,General Computer Science ,Computer science ,Turbo ,Clock rate ,02 engineering and technology ,Parallel computing ,Data_CODINGANDINFORMATIONTHEORY ,forward error correction (FEC) ,0202 electrical engineering, electronic engineering, information engineering ,single-instruction-multiple-data (SIMD) ,General Materials Science ,Forward error correction ,Low-density parity-check code ,low-density parity-check (LDPC) code ,Throughput (business) ,biology ,020208 electrical & electronic engineering ,polar code ,General Engineering ,biology.organism_classification ,020202 computer hardware & architecture ,Memory bank ,Convolutional code ,turbo code ,lcsh:Electrical engineering. Electronics. Nuclear engineering ,lcsh:TK1-9971 ,Decoding methods - Abstract
In this paper, we extend polar decoding function to our previous design, and propose a flexible quad-mode forward error correction application specific instruction-set processor (QFEC ASIP) that supports polar, low-density parity-check (LDPC), turbo, and convolutional code (CC) decoding with multiple code lengths and code rates. A unified polar/LDPC/turbo/CC quad-mode algorithm framework is presented. The top level architecture of QFEC ASIP and the polar data path are designed on the basis of the algorithm framework. A quad-mode confliction-free global memory system is proposed. 65.2% of global memory banks, 48.9% of global memory bits, and 29.7% of global memory area are saved via hardware sharing. Specially accelerated FEC decoding instructions make the decoding procedure fully programmable and ensure the high throughput. Synthesis using 65-nm technology shows that the total area of QFEC ASIP is 4.26 mm2. QFEC ASIP provides the maximum throughput of 1345 Mb/s for polar, 917 Mb/s for LDPC (WiMAX), 320 Mb/s for turbo, and 387 Mb/s for CC (64 states) at the clock frequency of 344 MHz. QFEC ASIP occupies much smaller silicon area than the sum of the silicon area of 4 single-mode FEC decoders that together provide a similar function range as QFEC ASIP.
- Published
- 2018
32. Highly Selective Enamination of β‐ketoesters Catalyzed by Interlocked [Cu 8 ] and [Cu 18 ] Nanocages
- Author
-
Qiao, Wan‐Zhen, primary, Song, Tian‐Qun, additional, Cheng, Peng, additional, and Zhao, Bin, additional
- Published
- 2019
- Full Text
- View/download PDF
33. Campanian–Maastrichtian palynomorph from the Sifangtai and Mingshui formations, Songliao Basin, Northeast China: Biostratigraphy and paleoflora
- Author
-
Atsushi Matsuoka, Kohei Yoshino, Xiao-Qiao Wan, Wei Li, and Dang-Peng Xi
- Subjects
Delta ,Palynology ,010506 paleontology ,geography ,geography.geographical_feature_category ,Floodplain ,biology ,Stratigraphy ,Paleontology ,Ecological succession ,Biostratigraphy ,Structural basin ,010502 geochemistry & geophysics ,biology.organism_classification ,medicine.disease_cause ,01 natural sciences ,Pteridophyte ,Pollen ,medicine ,Ecology, Evolution, Behavior and Systematics ,Geology ,0105 earth and related environmental sciences - Abstract
We recovered a Campanian–Maastrichtian palynological record in transitional succession from the Sifangtai to Mingshui formations of the Songke Core-1 (North) (SK1 (N)) in the Songliao Basin, Northeast China. These formations are composed mainly of various colored mudstones and sandstones. The lithofacies variation suggests that the paleoenvironment changed from flood plain to lake. Most of the palynomorph assemblages are dominated by gymnosperm pollen, followed by spore of pteridophyte, and angiosperm pollen. On the basis of the first occurrences of marker genera within the succession, we identified four palynomorph interval zones (in ascending order): the Jianghanpollis, Chenopodipollis, Toroisporis, and Betulaceoipollenites interval zones. The first two interval zones are found from flood plain and levee deposits. The third one is recognized from lake basin plain–lake basin slope deposits. The last one is found in delta deposits within lakeshore. We consider that environmental changes are the major factors that formed component of Campanian–Maastrichtian assemblage in the Songliao Basin. In addition, the Jianghanpollis and Chenopodipollis interval zones are assigned to the Campanian, whereas the Toroisporis and Betulaceoipollenites interval zones date as the Maastrichtian. Thus, the Chenopodipollis/Toroisporis zonal boundary approximates the C/M boundary. Triprojectate pollen such as Aquilapollenites is regarded as marker taxa in the study section and other areas within the Aquilapollenites Province during the Campanian–Maastrichtian. However, Wodehouseia spp. have yet been confirmed within the study section, although this genus has appeared in Campanian–Maastrichtian deposits in other areas. This is one of the important clues to understand regional difference of local flora in these ages.
- Published
- 2017
34. Simulating Human Host Interventions to Control Intra-urban Dengue Outbreaks with a Spatially Individual-based Model
- Author
-
Li Wang, Liang Mao, Kang Liu, Qiao Wan, Ling Yin, Qinglan Li, and Shujiang Mei
- Subjects
education.field_of_study ,Isolation (health care) ,Computer science ,030231 tropical medicine ,Population ,Psychological intervention ,Outbreak ,Disease ,medicine.disease ,Dengue fever ,Vaccination ,03 medical and health sciences ,0302 clinical medicine ,Intervention (counseling) ,Environmental health ,medicine ,030212 general & internal medicine ,education - Abstract
The incidence of dengue fever, a mosquito-borne disease, has significantly increased throughout the world in recent decades, which urgently requires more effective dengue intervention strategies. Although both mosquitos and humans play critical roles in dengue transmission, commonly used dengue intervention strategies mainly depend on the control of the mosquito vector. Since intervention simulations by computers offer important scientific support for disease intervention policy-making, this study aims to simulate and evaluate the intervention strategies from the perspective of the human host. This study first develops a spatially-explicit, individual-based model that can simulate an intra-urban dengue outbreak by integrating the daily activities and travels of urban populations. Then, we examined two human host intervention strategies: a dengue vaccination program and early isolation of symptomatic infected people. Taking the dengue outbreak of Shenzhen in 2014 as a case study, our simulation results show that the reduction of symptomatic infected people increases from 60.21% to 94.39% as the proportion of the immunized population increases from 25% to 50%, while early isolation of symptomatic infected people can reduce total symptomatic infected people by 46.78%. Overall, this study provides an effective, spatially-explicit, individual-based model that allows dengue transmission simulations and human host intervention simulations, which can help guide policy-making to control dengue outbreaks at an urban scale.
- Published
- 2019
35. A2S-Det: Efficiency Anchor Matching in Aerial Image Oriented Object Detection
- Author
-
Xiaowei Tan, Chuan Xu, Kai Wang, Zhifeng Xiao, Fanfan Xia, and Qiao Wan
- Subjects
Matching (graph theory) ,anchor-based ,Computer science ,Science ,0211 other engineering and technologies ,Boundary (topology) ,02 engineering and technology ,anchor selection ,Set (abstract data type) ,Minimum bounding box ,0202 electrical engineering, electronic engineering, information engineering ,aerial image ,rotation object detection ,Computer vision ,Aerial image ,021101 geological & geomatics engineering ,business.industry ,Object (computer science) ,Object detection ,TheoryofComputation_MATHEMATICALLOGICANDFORMALLANGUAGES ,General Earth and Planetary Sciences ,020201 artificial intelligence & image processing ,Artificial intelligence ,business ,Rotation (mathematics) - Abstract
Object detection is a challenging task in aerial images, where many objects have large aspect ratios and are densely arranged. Most anchor-based rotating detectors assign anchors for ground-truth objects by a fixed restriction of the rotation Intersection-over-Unit (IoU) between anchors and objects, which directly follow horizontal detectors. Due to many directional objects with a large aspect ratio, the object-anchor IoU is heavily influenced by the angle, which may cause few anchors assigned for some ground-truth objects. In this study, we propose an anchor selection method based on sample balance assigning anchors adaptively, which we name the Self-Adaptive Anchor Selection (A2S-Det) method. For each ground-truth object, A2S-Det selects a set of candidate anchors by horizontal IoU. Then, an adaptive threshold module is adopted on the set of candidate anchors, which calculates a boundary of these candidate anchors aiming to keep a balance between positive and negative anchors. In addition, we propose a coordinate regression of relative reference(CR3) module to precisely regress the rotating bounding box. We test our method on a public aerial image dataset, and prove better performance than many other one-stage detectors and two-stage detectors, achieving the mAP of 70.64. An efficiency anchor matching method helps the detector achieve better performance for objects with large aspect ratios.
- Published
- 2020
36. Two new glycosidal metabolites of endophytic fungus Penicillium sp. (NO.4) from Tapiscia sinensis
- Author
-
Qiao Wan, Kun Zou, Meng-Meng Lv, Ziwei Feng, Zhang-Shuang Deng, Zhiyong Guo, and Xueshuang Li
- Subjects
Tapiscia sinensis ,biology ,010405 organic chemistry ,Chemistry ,Botany ,Penicillium ,General Chemistry ,Endophytic fungus ,010402 general chemistry ,biology.organism_classification ,01 natural sciences ,0104 chemical sciences - Abstract
Two new glycosides, 8-O-β- d-glucopyranosyl-6-methyl-1-carboxylate methyl ester xanthone (1) and 4′-O-β- d-galactopyranosyl djalonensone (2), together with four known compounds, 8-hydroxy-6-methyl-9-oxo-9H-xanthene-1-carboxylate methyl ester (3), cassionllin (4), djalonensone (5) and alternariol (6), were isolated from the endophytic fungus Penicillium sp. (NO.4) of Tapiscia sinensis Oliv. The structures of compounds 1–6 were elucidated by the analysis of 1D and 2D NMR and HRMS. The cytotoxic activities of these compounds were evaluated against four cancer cell lines, as well as antimicrobial activities against two plant-pathogenic microbes. Compounds 1–6 showed moderate cytotoxicity against the A549 cancer cell line with IC50 values ranging from 6.8 to 35.8 μg mL−1 and were found to be inactive against three other cancer cell lines MCF-7, Caski and Hep G-2.
- Published
- 2016
37. [Establishment and Identification of MDS Mouse Model with Irom Overload]
- Author
-
Xin, Jin, Song-Nang, Sui, Ping, Xu, Yi, Xin, Xiao-Li, Cao, Lu-Qiao, Wan, Juan-Xia, Men, Wen-Yi, Lu, Rui, Cui, and Ming-Feng, Zhao
- Subjects
Mice, Inbred C57BL ,Disease Models, Animal ,Mice ,Iron Overload ,Bone Marrow ,Animals ,Spleen - Abstract
To establish a MDS mouse model with iron overload and to study the effect of iron overload on MDS.The exogenous mutant gene RUNX1-S291fs was inserted into the mice bone marrow mononuclear cell's genome in mice by retrovirus and transplanted into C57BL/6 mice irradiated byCompared with the empty plasmid control mice, levels of leukocyte and hemoglobin as well as platelet were decreased in RUNX1-S291fs mutant mice; the peripheral blood cells and bone marrow cells showed pathological hematopoiesis; the liver and spleen enlarged significantly; the tissue structure of femur, liver and spleen was abnormal; the expression of bone marrow cell surface antigens was abnormal. Bone marrow cells and spleen tissue expressed the RUNX1-S291fs protein. Compared with the controlled mice injected with normal saline, iron deposition occurred in the bone marrow, liver and spleen stained with Prussian blue in the mice injected with iron agent.Mice engineered to carry exogenous mutant gene RUNX1-S291fs and injected with iron showed pathologic features of MDS and iron overload, resulting in establishing MDS iron overloaded mouse model successfully, which lays a foundation for studying the effect of iron overload on MDS.
- Published
- 2018
38. Water Stable [Tb4] Cluster-Based Metal–Organic Framework as Sensitive and Recyclable Luminescence Sensor of Quercetin
- Author
-
Song, Tian-Qun, primary, Yuan, Kuo, additional, Qiao, Wan-Zhen, additional, Shi, Ying, additional, Dong, Jie, additional, Gao, Hong-Ling, additional, Yang, Xiu-Pei, additional, Cui, Jian-Zhong, additional, and Zhao, Bin, additional
- Published
- 2019
- Full Text
- View/download PDF
39. Late Cretaceous palynology and paleoclimate change: Evidence from the SK1 (South) core, Songliao Basin, NE China
- Author
-
JinYan Zhang, Qinghua Huang, Dang-Peng Xi, Jing Zhao, Xia Jing, Xiao-Qiao Wan, and Wei Li
- Subjects
Palynology ,biology ,Dinoflagellate ,Biozone ,biology.organism_classification ,medicine.disease_cause ,Cretaceous ,Paleontology ,Pollen ,Paleoclimatology ,Paleoecology ,medicine ,General Earth and Planetary Sciences ,Cenomanian ,Geology - Abstract
Cretaceous climate was warmer than today. The Songliao Basin contains one of the most important Late Cretaceous non-marine deposits in China for the research of the paleoenvironment and paleoclimate. This research is based on core samples from the SK1(S) borehole. The strata sampled are the upper part of the Quantou Formation to member 2 of the Nenjiang Formation, where spores, pollen, dinoflagellates, and other microfossils are abundantly preserved. Based on analysis of the spores and pollen fossils from the core samples, the following six fossil assemblage zones have been recognized in ascending order: The Cicatricosisporites-Cyathidites-Pinuspollenites, Schizaeoisporites-Cyathidites-Classopollis, Cyathidites-Schizaeoisporites, Schizaeoisporites-Cyathidites-Proteacidites, Proteacidites-Cyathidites-Dictyotriletes, and the Lythraites-Callistipollenites-Schizaeoisporites zones. The six fossil zones range from the late Cenomanian to early Campanian. The Late Cretaceous dinoflagellate cysts in the Songliao Basin are of high abundance and low diversity. Specific phytoplankton types reflect salinity changes of the Songliao Lake. Paleoecology of the dinoflagellates suggests that sediments of members 2 and 3 of the Yaojia Formation (K2 y 2+3) were deposited in a freshwater environment, whereas members 2 and 3 of the Qingshankou Formation (K2 q 2+3) and members 1 and 2 of the Nenjiang Formation (K2 n 1+2) were deposited in freshwater to brackish water environments. Combined with the paleoecology of dinoflagellates and the palynomorph biozones, valuable information of the paleoclimate was provided. The quantitative analyses of spores and pollen fossils, such as vegetation type, climate type, and humidity type, diversity and dominance, indicate a relatively sub-humid, mid-subtropical paleoclimate, with slight climatic fluctuation and/or temporal change.
- Published
- 2014
40. Evidence Impact Analysis of Organization Bureaucracy Wrongdoing and Auditor’s Likelihood on Whistle-blowing
- Author
-
Xiao Chen and Qiao-Wan Wang
- Subjects
business.industry ,media_common.quotation_subject ,05 social sciences ,Inherent risk (accounting) ,Accounting ,050201 accounting ,Audit ,Public relations ,Empirical research ,Wrongdoing ,0502 economics and business ,Organizational structure ,Bureaucracy ,Training program ,business ,050203 business & management ,media_common ,Whistle blowing - Abstract
Whistle-blowing has long been a controversial topic encountered by auditing industry. The complex relationship between stakeholders affects the tendency and effectiveness of whistle-blowing. This paper conducted a systemic empirical research on the impact of evidence of wrongdoing and organization structure on auditors’ likelihood of whistle-blowing. A survey of 133 professional auditors who attended a national training program was undertaken. The results showed that auditors were more likely to report wrongdoing when the strength of evidence of wrongdoing was strong, and to report externally when the bureaucracy of organization structure was high.
- Published
- 2017
41. Effects of Disperse Dyes on Dyeing of Ethylated Chinese Fir Powder
- Author
-
Ze Hua Yu, Jing Fang Tang, Wei Liu, Xiu Chen, Ying Zhao, and Xiao Qiao Wan
- Subjects
Polyester ,chemistry.chemical_compound ,Adsorption ,Materials science ,chemistry ,High pressure ,Polymer chemistry ,General Engineering ,Microporous material ,Dyeing ,Nuclear chemistry ,Disperse dye ,Smooth surface - Abstract
The dyeing properties of ethylated Chinese fir powder with disperse dyes under high temperature and high pressure were investigated in this paper, the dyeing results indicated that the color shade of dyed ethylated fir is similar to that of dyed polyester fabric while PH value of dyeing solution is between 4~5, and the dyed sample is of a good wash fastness. At the same time, the characteristics of the samples were analyzed by FT-IR and SEM, it indicated that dyes molecules were adsorbed on the surface and went into the microporous of ethylated fir powder, so that brighter color were observed due to the fact that the ethylated fir powder leads to a smooth surface which being favorable for the reflection of light.
- Published
- 2013
42. Highly Selective Enamination of β‐ketoesters Catalyzed by Interlocked [Cu8] and [Cu18] Nanocages.
- Author
-
Qiao, Wan‐Zhen, Song, Tian‐Qun, Cheng, Peng, and Zhao, Bin
- Subjects
- *
HETEROGENEOUS catalysts , *ETHYL acetoacetate , *CATALYTIC activity , *METAL-organic frameworks , *HETEROGENEOUS catalysis - Abstract
Interlocking cages are of great interest due to their fascinating structures and potential applications. However, the interlocking of different cages has not been previously reported. Herein, quadruply interlocked [Cu8] and [Cu18] nanocages have been constructed and structurally characterized in cationic metal–organic framework {[CuICu4II(XN)4(PTA)4(H2O)4]0.5 SO4⋅5 H2O⋅EtOH}n (1). 1 can trap the anionic pollutant CrO42− and the radioactive‐contaminant simulant ReO4− with an uptake capacity of 83.2 and 218 mg g−1, respectively. Catalytic investigations reveal 1 is an efficient heterogeneous catalyst for the enamination of ethyl acetoacetate with aniline and the turnover frequency (TOF) can reach a record value of 4000 h−1. More importantly, 1 represents the first of a catalyst of enamination to exhibit excellent size selectivity on different substrates. The robust catalyst can be reused at least ten times without obvious loss in catalytic activity. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
43. QFEC ASIP: A Flexible Quad-Mode FEC ASIP for Polar, LDPC, Turbo, and Convolutional Code Decoding
- Author
-
Qiao, Wan, primary, Liu, Dake, additional, and Liu, Shaohan, additional
- Published
- 2018
- Full Text
- View/download PDF
44. A scalable ASIP for BP Polar decoding with multiple code lengths.
- Author
-
Wang, Yansong, Qiao, Wan, and Liu, Dake
- Published
- 2018
45. Preparation and Dyeing of Ethylated Wood Plastic Composites
- Author
-
Yu Dai, Jing Fang Tang, Xiao Qiao Wan, Xiao Yan Tan, and Ying Zhao
- Subjects
Polyester ,chemistry.chemical_compound ,Materials science ,chemistry ,Composite number ,General Engineering ,Compatibility (geochemistry) ,Polystyrene ,Dyeing ,Composite material ,Disperse dye - Abstract
In this study, ethylated wood powder/polystyrene plastic composite (WPC) was obtained by combining ethylated Chinese Fir powder with polystyrene foam in DMF or CHCl3, and was dyed with disperse dyes. The results show that the compatibility of ethylated fir powder with polystyrene was good when the ratio of wood to plastic ratio is beyond 3:1. The color shade of dyed wood-plastic powder is close to that of dyed polyester fabric and high temperature is favorable for the dyeing of wood-plastic powder. Moreover, dyed wood plastic powder has good washing fastness, which depends on the molecular structure of disperse dyes, dye concentration and dyeing temperature.
- Published
- 2013
46. Multi-Scale DEM Generalization Processing in Different Landform Areas
- Author
-
Ya Juan Li, Qiao Wan, Xiao Mei Bi, Xiang Gao, and Yumin Chen
- Subjects
geography ,geography.geographical_feature_category ,Generalization ,Landform ,business.industry ,Computer science ,General Engineering ,Pattern recognition ,Grid ,Topographic map ,Image (mathematics) ,Feature (computer vision) ,Artificial intelligence ,Scale (map) ,business ,Digital elevation model - Abstract
As a special kind of image, the grid-based digital elevation model (DEM) is directly related with the landform and topography feature. In the real word, there are various landforms, and the results of different methods for DEM processing vary greatly. However, the discussion of using different methods in different landform areas in DEM generalization is needed. Numerous methods have been proposed previously for DEM generalization without taking topographic factors into consideration, and the setting of threshold value of most algorithms is very subjective. Therefore, we investigate the DEM generalization, using two methods (z-tolerance method and compound method) in different landform areas and propose a new way for threshold values setting in generalization. The results show that the method we proposed is feasible and the compound method offers a better performance over z-tolerance method in most conditions, especially when comparing their performances of keeping streamline shape.
- Published
- 2013
47. GPU-Accelerated Discrete Wavelet Transform for Images
- Author
-
Zhi Jun Su, Yumin Chen, Fei Zeng, Jing Yang Wu, and Qiao Wan
- Subjects
Discrete wavelet transform ,CUDA ,Speedup ,Wavelet ,Parallel processing (DSP implementation) ,Computer science ,ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION ,General Engineering ,Image processing ,Parallel computing ,Computational science ,Image (mathematics) - Abstract
Discrete Wavelet Transform (DWT) has been brought into wide use in image processing, but it cant fit the demand of the hugeimage data because the time of computing is vast. The GPU is an attractive platform for a broad fieldof applications,which remains asignificanthigharithmetic processingcapability. Therefore itcan beusedasa powerful accelerator without extra cost.CUDA(computeunifieddevicearchitecture) providesahardwareandsoftwareenvironment touse the GPU to accelerate the DWT for images. In this paper, we use the NVIDIA GeForce GT 650M that complies with the CUDA to improvethe execution time of theDiscrete Wavelet Transformfor images. TheresultofexperimentsindicatesthattheCUDAtechnology hastheadvantagesof parallel processingandtheefficiencyofimagetransform isimprovedgreatly. Whats more, it performs better on the larger size image (the max speedup is 15.9).
- Published
- 2013
48. Synthesis and Dyeing Performance of N,N-Bis(2-cyanoethyl)-m-methylaniline Disperse Dyes
- Author
-
Wei Liu, Ying Zhao, Ze Hua Yu, Xiao Qiao Wan, and Wen Lan Li
- Subjects
Polyester ,chemistry.chemical_compound ,Materials science ,chemistry ,Polymer chemistry ,General Engineering ,Acetone ,Diazo ,Fiber ,Dyeing ,Absorption (chemistry) ,Methylaniline ,Disperse dye - Abstract
Four di-cyanoethyl azo disperse dyes based on N,N-bis(2-cyanoethyl)-m-methylaniline were synthesized using four different heterocyclic aromatic amines as the diazo components. They were characterized by UV-Vis, IR, 1HNMR, MS and EA. The dyeing performance of these dyes were assessed on polyester, fir powder, and acetylated fir powder. On polyester, the results showed that the maxinum absorption of four heterocyclic azo disperse dyes were from 414 nm to 599 nm(acetone), they were also found to show a wide range of colour shades followed as yellow, bright crimson, bulish violet and blue shades, the dyed fibers also presented good light fastness and excellent fastness to wash. Simultaneously, the dyeing performance of the dyes were also assessed on acetylated fir powder and they were found to give the similar color shades comparing with the dyeing on polyester fiber.
- Published
- 2012
49. Dyeing Properties of Cyanoethylated Wood with Disperse Dyes
- Author
-
Ze Hua Yu, Fang Zhao, Ying Zhao, and Xiao Qiao Wan
- Subjects
Polyester ,chemistry.chemical_compound ,Materials science ,Temperature and pressure ,chemistry ,Color difference ,Scanning electron microscope ,General Engineering ,Dyeing ,Composite material ,Disperse dye - Abstract
The color cyanoethylated wood were preparated by means of dyeing under high temperature and pressure. The results indicates that the percentage of dye exhaustion (%E) on cyanoethylated fir powder is 95.3~98.8%. The color shade of dyed modified wood is similar to that of dyed polyester fabric. Compared with the dyed polyester fabric, the color difference (∆E) of dyed modified wood is smaller than that of dyed unmodified wood under the same dyeing condition. Unmodified fir powder, cyanoethylated fir powder and dyed cyanoethylated fir powder were characterized by Fouriertrans- form infrared (FT-IR), scanning electron microscopy (SEM).
- Published
- 2012
50. Dyeing Properties of Acetylated Wood with Red Disperse Dyes
- Author
-
Ze Hua Yu, Xiao Qiao Wan, Xiao Yan Tan, Wei Liu, and Ying Zhao
- Subjects
Polyester ,Materials science ,Color difference ,Polymer chemistry ,General Engineering ,Dyeing ,Nuclear chemistry - Abstract
The dyeing properties of acetylated fir powder and acetylated poplar spill with 8 red disperse dyes were studied in this paper. The dyeing results indicate that the percentage of dye exhaustion (% E)on acetylated fir powder is 96~99%. As for acetylated poplar spill, the percentage of dye exhaustion reaches 58~78%. The color shade of dyed modified wood is similar to that of dyed polyester fabric. Compared with the dyed polyester fabric, the color difference(∆E) of dyed modified wood is smaller than that of dyed unmodified wood under the same dyeing conditions. Furthermore, modified fir powder has excellent color fastness to washing, the dye removal of dyed acetylated fir powder is 0.4 ~ 1.8 % at 80°C for 2 h in the water. Both the Infrared (IR) spectra and microscopic images of fir powder, acetylated fir powder and dyed acetylated fir powder were investigated.
- Published
- 2011
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.