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All-f iber nanosecond pulsed f iber amplif ier

Feng Yu Feng Yu, Tingwu Ge Tingwu Ge, Jingjing Dai Jingjing Dai, Wenqi Zhang Wenqi Zhang, Zhiyong Wang Zhiyong Wang
2012 Chinese Optics Letters (COL)  
An all fiber structure nanosecond pulse is realized through two stage amplifiers, which has 8.78 W in average power, 1 064 nm in wavelength, 11 kHz in repetition frequency, 125 ns in impulse duration, 0.8 mJ in single pulse power, 5.3 kW in peak power. The optic-optic conversion efficiency is 55.6%. Meanwhile, we setup another system, a nanosecond pulse is realized through just one stage amplifier, which has 10.10 W in average power, 1 064 nm in wavelength, 11 kHz in repetition frequency, 150
more » ... in impulse duration, 0.92 mJ in single pulse power, 6 kW in peak power. The optic-optic conversion efficiency is 67%. The only one stage of amplifier simplifies the system structure and reduces the cost.
doi:10.3788/col201210.s10604 fatcat:wrr77msngnhldgs2dbuq56gioe

VirtualHome: Simulating Household Activities via Programs [article]

Xavier Puig, Kevin Ra, Marko Boben, Jiaman Li, Tingwu Wang, Sanja Fidler, Antonio Torralba
2018 arXiv   pre-print
In this paper, we are interested in modeling complex activities that occur in a typical household. We propose to use programs, i.e., sequences of atomic actions and interactions, as a high level representation of complex tasks. Programs are interesting because they provide a non-ambiguous representation of a task, and allow agents to execute them. However, nowadays, there is no database providing this type of information. Towards this goal, we first crowd-source programs for a variety of
more » ... ies that happen in people's homes, via a game-like interface used for teaching kids how to code. Using the collected dataset, we show how we can learn to extract programs directly from natural language descriptions or from videos. We then implement the most common atomic (inter)actions in the Unity3D game engine, and use our programs to "drive" an artificial agent to execute tasks in a simulated household environment. Our VirtualHome simulator allows us to create a large activity video dataset with rich ground-truth, enabling training and testing of video understanding models. We further showcase examples of our agent performing tasks in our VirtualHome based on language descriptions.
arXiv:1806.07011v1 fatcat:hvl5buwjwvh4hh6vhokbqdf4wm

Learning to Generate Diverse Dance Motions with Transformer [article]

Jiaman Li, Yihang Yin, Hang Chu, Yi Zhou, Tingwu Wang, Sanja Fidler, Hao Li
2020 arXiv   pre-print
With the ongoing pandemic, virtual concerts and live events using digitized performances of musicians are getting traction on massive multiplayer online worlds. However, well choreographed dance movements are extremely complex to animate and would involve an expensive and tedious production process. In addition to the use of complex motion capture systems, it typically requires a collaborative effort between animators, dancers, and choreographers. We introduce a complete system for dance motion
more » ... synthesis, which can generate complex and highly diverse dance sequences given an input music sequence. As motion capture data is limited for the range of dance motions and styles, we introduce a massive dance motion data set that is created from YouTube videos. We also present a novel two-stream motion transformer generative model, which can generate motion sequences with high flexibility. We also introduce new evaluation metrics for the quality of synthesized dance motions, and demonstrate that our system can outperform state-of-the-art methods. Our system provides high-quality animations suitable for large crowds for virtual concerts and can also be used as reference for professional animation pipelines. Most importantly, we show that vast online videos can be effective in training dance motion models.
arXiv:2008.08171v1 fatcat:kp57scjce5cnlejdqpukvhurem

Capacitance sensors for measuring suspended sediment concentration

Xiaoyu Li, Tingwu Lei, Wei Wang, Qichuan Xu, Jun Zhao
2005 CATENA  
Measurements of suspended sediment concentration are of importance in soil erosion research and soil and water conservation practices and monitoring. A method of measuring sediment concentration with capacitance sensors was advanced in this study. The relationships between the sediment concentration in flowing water and the output of capacitance sensor, as affected by temperature, flow velocity, soil types and salt contents were experimentally investigated with two types of capacitance sensors.
more » ... The temperature used in the experiments ranged from 0 to 40 degrees centigrade. Salt concentrations (NaCl) in the flowing water ranged from 0 to 5 g/L and the flow velocity varied between 0.5 to 2.0 m/s. Two types of soil (a loam and a sandy soil) with sediment concentration up to 70% were studied. The results showed that suspended sediment concentrations, over a wide range, were linearly correlated with the outputs of capacitance sensors. The outputs of the capacitance sensor increased with temperature, with little influence from flow velocity, soil types and salt concentration. The results suggest that capacitance sensors may be used for sediment concentration measurement of flowing water. D
doi:10.1016/j.catena.2005.01.001 fatcat:hfepixr4g5bfxkbzu4q75zonpi

Diagnosis, disease stage, and distress of Chinese cancer patients

Boyan Huang, Huiping Chen, Yaotiao Deng, Tingwu Yi, Yuqing Wang, Yu Jiang
2016 Annals of Translational Medicine  
The objective is to assess how cancer patients know about their diagnosis what they know about their real stage, and the relationship between cancer stage and psychological distress. A questionnaire including the Distress Thermometer was delivered to 422 cancer inpatients. Multivariate logistic regression analysis was used to estimate odds ratios (OR) and 95% confidence intervals (CI). Most of patients (68.7%) knew the bad news immediately after diagnosis. Half of patients knew their diagnosis
more » ... irectly from medical reports. Nearly one third of patients were informed by doctors. Cancer stages, which patients believed, differed significantly from their real disease stages (P<0.001). Over half of patients did not know their real disease stages. Patients with stage I-III cancer were more likely to know their real disease stage than patients with stage IV cancer (P<0.001). Distress scores of cancer patients were determined by the real cancer stage (P=0.012), not the stage which patients believed. Although most of participants knew the bad news immediately after diagnosis, less than half of them knew their real disease stage. Patient with stage I-III cancer was more likely to know the real disease stage and had a DT score <4 than patient with stage IV disease.
doi:10.3978/j.issn.2305-5839.2016.02.08 pmid:27004220 pmcid:PMC4779786 fatcat:m2rpei7yrbffjm2ujof7jwrf74

VirtualHome: Simulating Household Activities Via Programs

Xavier Puig, Kevin Ra, Marko Boben, Jiaman Li, Tingwu Wang, Sanja Fidler, Antonio Torralba
2018 2018 IEEE/CVF Conference on Computer Vision and Pattern Recognition  
In this paper, we are interested in modeling complex activities that occur in a typical household. We propose to use programs, i.e., sequences of atomic actions and interactions, as a high level representation of complex tasks. Programs are interesting because they provide a non-ambiguous representation of a task, and allow agents to execute them. However, nowadays, there is no database providing this type of information. Towards this goal, we first crowd-source programs for a variety of
more » ... ies that happen in people's homes, via a game-like interface used for teaching kids how to code. Using the collected dataset, we show how we can learn to extract programs directly from natural language descriptions or from videos. We then implement the most common atomic (inter)actions in the Unity3D game engine, and use our programs to "drive" an artificial agent to execute tasks in a simulated household environment. Our VirtualHome simulator allows us to create a large activity video dataset with rich ground-truth, enabling training and testing of video understanding models. We further showcase examples of our agent performing tasks in our VirtualHome based on language descriptions.
doi:10.1109/cvpr.2018.00886 dblp:conf/cvpr/PuigRBLWF018 fatcat:ex4gg4ggd5c4llu5f3khzr4poa

Access points selection in super WiFi network powered by solar energy harvesting

Tingwu Wang, Chunxiao Jiang, Yong Ren
2016 2016 IEEE Wireless Communications and Networking Conference  
Super WiFi is expected to enable the Internet access everywhere in a country. Considering the infrastructure deployment issues, energy harvesting technology is a promising solution for power supply. Most of existing works focused on the energy scheduling from the network operator's point of view. In this paper, we study the access point selection strategy from users' perspectives and consider Super WiFi networks powered by solar energy harvesting. Although the network selection problem has been
more » ... studied, the energy harvesting scenario has not been well investigated and the influence of battery condition has not been taken into account. In our work, we consider the utility of the access users is affected not only by the total number of accessed users, but also the battery condition. In order to formulate the battery states and user states, we incorporate the physical characteristics of solar cell, as well as the dynamic access behaviors of users through Markov Decision Process (MDP)model. By using the value iteration method, the set of optimal network selection strategies is obtained. Simulation results validate that our method has a remarkable performance improvement of utility over the myopic and random access strategies.
doi:10.1109/wcnc.2016.7564863 dblp:conf/wcnc/WangJR16 fatcat:j6qm7cfpxrgybcbysaef4qyrta

Low Loss Hollow-Core Connecting-Circle Negative-Curvature Fibres

Boyi Yang, Xuesheng Liu, Wenzeng Jia, Shu Liu, Kai Mei, Tingwu Ge, Dengcai Yang, Youqiang Liu, Tian Lan, Zhiyong Wang
2021 IEEE Photonics Journal  
In 2018, Wang Y Y of the Institute of Laser Engineering of Beijing University of Technology devised a new structure of hollow-core negative-curvature fibres, when the transmission wavelength is 1512 nm  ... 
doi:10.1109/jphot.2021.3052947 fatcat:t74jc7u345gi3m37s4vda37tte

A Combined Proteomic and Transcriptomic Analysis on Sulfur Metabolism Pathways of Arabidopsis thaliana under Simulated Acid Rain

Tingwu Liu, Juan A. Chen, Wenhua Wang, Martin Simon, Feihua Wu, Wenjun Hu, Juan B. Chen, Hailei Zheng, Keqiang Wu
2014 PLoS ONE  
With rapid economic development, most regions in southern China have suffered acid rain (AR) pollution. In our study, we analyzed the changes in sulfur metabolism in Arabidopsis under simulated AR stress which provide one of the first case studies, in which the systematic responses in sulfur metabolism were characterized by high-throughput methods at different levels including proteomic, genomic and physiological approaches. Generally, we found that all of the processes related to sulfur
more » ... ism responded to AR stress, including sulfur uptake, activation and also synthesis of sulfurcontaining amino acid and other secondary metabolites. Finally, we provided a catalogue of the detected sulfur metabolic changes and reconstructed the coordinating network of their mutual influences. This study can help us to understand the mechanisms of plants to adapt to AR stress.
doi:10.1371/journal.pone.0090120 pmid:24595051 pmcid:PMC3940841 fatcat:y7zyienh6bgy7fnemunegs6s7i

Evolution Characteristics for Water Eco-Environment of Baiyangdian Lake with 3S Technologies in the Past 60 Years [chapter]

Yunkai Li, Lingyan Wang, Hua Zheng, Hai Jin, Tingwu Xu, Peiling Yang, Xiaokai Tijiang, Zengcai Yan, Zhiheng Ji, Jianli Lu, Zhanfeng Wang, Zhiyun Ouyang
2012 IFIP Advances in Information and Communication Technology  
Keeping water eco-environment health and virtuous circle of lake-wetland, and letting lakes recuperate and reproduce has become a common view all over the world. Although a great deal of research results were obtained, such as lake-wetland ecosystem management and eco-hydrological mechanism of eco-environment evolution, there are few researches about comprehensive analysis on evolution trend and driven mechanism of lake-wetland water eco-environment. Baiyangdian, the biggest grass-type
more » ... and in North China, was chosen as the research object in this paper. Based on the long-term and field observations of water environmental quality and analysis for remote sensing images of water ecological landscape pattern, the evolution trend and driving mechanism for water eco-environment of Baiyangdian in the past 60 years have been studied systematically. The results showed that the average annual water level fluctuated greatly with a decreasing tendency as a whole. During 1974 and 2007, there was a general pattern of land use types, which the emergent plants, water body and cultivated land were the main, and the residential area, forest land, grass land and unused land were distributed as flower arrangement state. During the periods, the water body and emergent plants areas were decreased respectively by 28.7% and 20.8%, while the cultivated land areas were increased by 69.7%. The main pollutants (NH4+-N, CODMn, BOD5, TP, and TN) concentrations in Baiyangdian Lake were changed greatly with spatiotemporal variation and the pollutant concentrations were increased obviously. In the three polluted regions (north zone, south zone, and
doi:10.1007/978-3-642-27278-3_46 fatcat:lywubtvv2febxcutsn55lf27oa

Two new triterpenoid saponins derived from the leaves of Panax ginseng and their antiinflammatory activity

Fu Li, Yufeng Cao, Yanyan Luo, Tingwu Liu, Guilong Yan, Liang Chen, Lilian Ji, Lun Wang, Bin Chen, Aftab Yaseen, Ashfaq A. Khan, Guolin Zhang (+5 others)
2018 Journal of Ginseng Research  
The leaves and roots of Panax ginseng are rich in ginsenosides. However, the chemical compositions of the leaves and roots of P. ginseng differ, resulting in different medicinal functions. In recent years, the aerial parts of members of the Panax genus have received great attention from natural product chemists as producers of bioactive ginsenosides. The aim of this study was the isolation and structural elucidation of novel, minor ginsenosides in the leaves of P. ginseng and evaluation of
more » ... antiinflammatory activity in vitro. Various chromatographic techniques were applied to obtain pure individual compounds, and their structures were determined by nuclear magnetic resonance and high-resolution mass spectrometry, as well as chemical methods. The antiinflammatory effect of the new compounds was evaluated on lipopolysaccharide-stimulated RAW 264.7 cells. Two novel, minor triterpenoid saponins, ginsenoside LS1 (1) and 5,6-didehydroginsenoside Rg3 (2), were isolated from the leaves of P. ginseng. The isolated compounds 1 and 2 were assayed for their inhibitory effect on nitric oxide production in LPS-stimulated RAW 264.7 cells, and Compound 2 showed a significant inhibitory effect with IC50 of 37.38 μM compared with that of NG-monomethyl-L-arginine (IC50 = 90.76 μM). Moreover, Compound 2 significantly decreased secretion of cytokines such as prostaglandin E2 and tumor necrosis factor-α. In addition, Compound 2 significantly suppressed protein expression of inducible nitric oxide synthase and cyclooxygenase-2. These results suggested that Compound 2 could be used as a valuable candidate for medicinal use or functional food, and the mechanism is warranted for further exploration.
doi:10.1016/j.jgr.2018.09.004 pmid:31695566 pmcid:PMC6823746 fatcat:4bb6mej4u5cuxiyp5q5stw2pbu

Analysis of soil erosion characteristics in small watersheds with particle swarm optimization, support vector machine, and artificial neuronal networks

Li Yunkai, Tian Yingjie, Ouyang Zhiyun, Wang Lingyan, Xu Tingwu, Yang Peiling, Zhao Huanxun
2009 Environmental Earth Sciences  
Tang and Cai (2002) , Cai and Liu (2003) , Wang et al. (2004) and Ni et al. (2005) conducted systematic induction and summarization on sand production models of soil erosion in China.  ...  total vegetation coverage) reflected the effects of the vegetation and terrain on the soil erosion, which was consistent with previous studies (Jin et al. 1991; Tang and Cai 2002; Cai and Liu 2003; Wang  ... 
doi:10.1007/s12665-009-0292-1 fatcat:jmdht4337nf5jelbkcufnndlie

Access Strategy in Super WiFi Network Powered by Solar Energy Harvesting: A POMDP Method

Tingwu Wang, Jian Wang, Chunxiao Jiang, Jingjing Wang, Yong Ren
2016 2016 IEEE 83rd Vehicular Technology Conference (VTC Spring)  
The recently announced Super Wi-Fi Network proposal in United States is aiming to enable Internet access in a nation-wide area. As traditional cable-connected power supply system becomes impractical or costly for a wide range wireless network, new infrastructure deployment for Super Wi-Fi is required. The fast developing Energy Harvesting (EH) techniques receive global attentions for their potential of solving the above power supply problem. It is a critical issue, from the user's perspective,
more » ... ow to make efficient network selection and access strategies. Unlike traditional wireless networks, the battery charge state and tendency in EH based networks have to be taken into account when making network selection and access, which has not been well investigated. In this paper, we propose a practical and efficient framework for multiple base stations access strategy in an EH powered Super Wi-Fi network. We consider the access strategy from the user's perspective, who exploits downlink transmission opportunities from one base station. To formulate the problem, we used Partially Observable Markov Decision Process (POMDP) to model users' observations on the base stations' battery situation and decisions on the base station selection and access. Simulation results show that our methods are efficacious and significantly outperform the traditional widely used CSMA method.
doi:10.1109/vtcspring.2016.7504116 dblp:conf/vtc/WangWJWR16 fatcat:vsc4v3j4mjdntc7uevhhcataeu

Front Matter

2021 Computer graphics forum (Print)  
Vaxman, Amir Viertel, Ryan Walter, Bruce Wang, Beibei Wang, Tingwu Wang, Xinlei Wang, Yangang Wang, Yiqun Wei, Li-Yi Weinmann, Michael Weiss, Tomer Won, Jungdam Wong, Tien-Tsin Wu, Hongzhi  ...  Defragmentation for Photo-Reconstructed 3D Models Andrea Maggiordomo, Paolo Cignoni, and Marco Tarini Rendering Temporally Reliable Motion Vectors for Real-time Ray Tracing Zheng Zeng, Shiqiu Liu, Jinglei Yang, Lu Wang  ... 
doi:10.1111/cgf.142657 fatcat:7phqw7lprrgkbngm7exhjyvdxu

Water-Yield Relations of Drip Irrigated Watermelon in Temperate Climatic Conditions

Borivoj Pejić, Ksenija Mačkić, Srdjan Pavković, Branka Ljevnaić-Mašić, Miroljub Aksić, Jelica Gvozdanović-Varga
2016 Contemporary Agriculture  
Wang et al. (1996) pointed out that crop yield depends on the rate of water use, and that all factors increasing yield and decreasing water used for ET favorably affect the ET wue .  ...  Many studies have been done on the determination of watermelon ET wue and I wue for different irrigation methods and environmental conditions (Tingwu et al., 2003; Erdem et al., 2005; Kuscu et al., 2015  ... 
doi:10.1515/contagri-2016-0009 fatcat:4rwtu6nnubfqvcp2ltgmcts7he
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