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Understanding taxi drivers＇ routing choices from spatial and social traces

Frontiers of Computer Science 2015年第2期9卷 200-209页

作者： siyuan liu Shuhui WANG Ce liu Ramayya KRISHNAN Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen 518055 China University of Chinese Academy of Sciences Beijing 100049 China Heinz CoUege Carnegie Mellon University Pittsburgh PA 15213 USA Key Lab of Intellectual Information Processing Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China School of Information Sciences University of Pittsburgh Pittsburgh PA 15260 USA

Most of our learning comes from other people or from our own experience. For instance, when a taxi driver is seeking passengers on an unknown road in a large city, what should the driver do？ Alternatives include cruising around the road or waiting for a time period at the roadside in the hopes of finding a passenger or just leaving for another road enroute to a destination he knows （e.g., hotel taxi rank）？ This is an interesting problem that arises everyday in cities all over the world. There could be different answers to the question poised above, but one fundamental problem is how the driver learns about the likelihood of finding passengers on a road that is new to him （as he has not picked up or dropped off passengers there before）. Our observation from large scale taxi driver trace data is that a driver not only learns from his own experience but through interactions with other drivers. In this paper, we first formally define this problem as socialized information learning （SIL）, second we propose a framework including a series of models to study how a taxi driver gathers and learns information in an uncertain environment through the use of his social network. Finally, the large scale real life data and empirical experiments confirm that our models are much more effective, efficient and scalable that prior work on this problem.

关键词： routing choices socialized information learn-ing social network

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Role of genetics and the environment in the etiology of congenital diaphragmatic hernia

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World Journal of Pediatric Surgery 2024年第3期7卷 209-220页

作者： siyuan liu Lan Yu Department of Cardiac&Thoracic Surgery Children's HospitalZhejiang University School of MedicineNational Clinical Research Center for Child HealthHangzhouZhejiangChina National Clinical Research Center for Child Health Children's HospitalZhejiang University School of MedicineHangzhouZhejiangChina

Congenital diaphragmatic hernia(CDH)is a congenital malformation characterized by failure of diaphragm closure during embryonic development,leading to pulmonary hypoplasia and pulmonary hypertension,which contribute significantly to morbidity and *** occurrence of CDH and pulmonary hypoplasia is theorized to result from both abnormalities in signaling pathways of smooth muscle cells in pleuroperitoneal folds and mechanical compression by abdominal organs within the chest cavity on the developing ***,the precise etiology of diaphragm maldevelopment in CDH is not fully understood,it is believed that interplay between genes and the environment contributes to its *** 30%of patients with CDH possess chromosomal or single gene defects and these patients tend to have inferior outcomes compared with those without genetic *** present,approximately 150 gene variants have been linked to the occurrence of *** variable expression of the CDH phenotype in the presence of a recognized genetic predisposition can be explained by an environmental effect on gene penetrance and *** retinoic acid pathway is thought to play an essential role in the interactions of genes and environment in ***,apart from the gradually maturing retinol hypothesis,there is limited evidence implicating other environmental factors in CDH *** review aims to describe the pathogenesis of CDH by summarizing the genetic defects and potential environmental influences on CDH development.

关键词： congenital hernia etiology

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Functional interface based on silicon artificial chamfer nanocylinder arrays （CNCAs） with underwater superoleophobicity and anisotropic properties

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Nano Research 2016年第10期9卷 3141-3151页

作者： Wendong liu Xueyao liu siyuan Xiang Yixin Chen Liping Fang Bai Yang State Key Laboratory of Supramolecular Structure and Materials College of Chemistry Jilin University Changchun 130012 China

A functional interface based on silicon chamfer nanocylinder arrays （CNCAs） was successfully fabricated by carrying out secondary etching of silicon nanopillar arrays via a facile inclined etching method. The structure of the novel CNCAs was finely modulated by varying the nanopillar array structure and the etching conditions. The underwater oil wetting behavior of this CNCAs-based interface can be easily modulated from superoleophilic （oil contact angle （OCA） of -8.13°） state to superoleophobic （OCA of ~163.79°） state by modifying the surface using different substances. Moreover, a reversible transformation of underwater oil wetting behavior from superoleophobic （OCA of -155.67°） state to oleophilic （OCA of ~31.27°） state was achieved by grafting a temperature-responsive polymer onto this specific asymmetric structure. The functional interface exhibited isotropic wetting behavior under certain oleophilic conditions. Chemically heterogeneous structures, obtained via asymmetry modification of CNCAs, exhibited amphiphobic properties while maintaining their anisotropic wetting ability.

关键词： chamfer nanocylinder arrays inclined etching superoleophobic anisotropic chemical-heterogeneous

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Designed histidine-rich peptide self-assembly for accelerating oxidase-catalyzed reactions

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Nano Research 2022年第5期15卷 4032-4038页

作者： Peidong Du siyuan liu Hao Sun Haifeng Wu Zhen-Gang Wang State Key Laboratory of Organic-Inorganic Composites Key Lab of Biomedical Materials of Natural Macromolecules(Beijing University of Chemical TechnologyMinistry of Education)Beijing Laboratory of Biomedical MaterialsBeijing University of Chemical TechnologyBeijing 100029China

It is an important goal for supramolecular chemistry to develop synthetic enzyme mimics rivaling native enzymes,while de novo fabrication of such mimics remains a ***,the catalytic groups from the supramolecular complex can be integrated with the active sites of natural ***,we present a supramolecular catalytic hybrid that is self-assembled from oligohistidine-based peptides and a heme-dependent *** results indicate that the peptides altered the enzyme conformation,promoted the transitions between the resting and the intermediate states of the heme,and increased the turnover rate of the enzyme by up to *** propose that the histidine residues from the peptides may collaborate with the groups in the natural heme pocket to accelerate the catalytic cycles of the *** observations underline the advantages of the supramolecular approach and suggest that molecular self-assembly may combine with enzymes to provide a simple strategy to engineer the enzymatic active sites.

关键词： self-assembly oligohistidine enzymes biocatalysis active site

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Enhancing prime editing efficiency and flexibility with tethered and split pegRNAs

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Protein & Cell 2023年第4期14卷 304-308页

作者： Ying Feng siyuan liu Qiqin Mo Pengpeng liu Xiao Xiao Hanhui Ma School of Biotechnology East China University of Science and TechnologyShanghai 200237China Gene Editing Center School of Life Science and TechnologyShanghaiTech UniversityShanghai 200135China Department of Molecular Cell and Cancer BiologyUniversity of Massachusetts Medical SchoolWorcesterMA O01655USA

Dear Editor,Most human genetic diseases arise from mutations such as insertion,deletion,or point mutations(Landrum et al.,2016).CRISPRCas system has been repurposed to correct pathogenic mutations in a variety of genetic diseases(Choi et al.,2022).There are many concerns about using CRISPR-mediated double-stranded DNA breaks(DSBs)for therapeutic purposes,primarily due to off-targeted mutations(Kosicki et al.,2018).Nevertheless,base editing cannot correct deletions,insertions,or some point mutations such as transversion *** editing has its advantages of precisely correct point mutations,small insertions,or deletions in animal cells(Anzalone et al.,2019)and plants(Lin et al.,2020).However,prime editing efficiency varies among genomic sites or cell types(Chen et al.,2021;Nelson et al.,2022).

关键词： insertion editing alone

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Mechanical State Prediction Based on LSTM Neural Netwok 36

Mechanical State Prediction Based on LSTM Neural Netwok

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第36届中国控制会议

作者： Zaifa Chen Yancheng liu siyuan liu Marine Engineering College Dalian Maritime University Zhejiang International Martime College

ISBN: (纸本)9781538629185

Effective mechanical state prediction systems are critical to modern manufacturing systems and *** a method of deep learning algorithm,Recurrent neural network,（RNN） has been playing an increasingly important role in the field of time series *** order to solve the problem of hard training and gradient extinction of RNN model,a long short-term memory network（LSTM） algorithm is proposed and applied to the prediction of mechanical state（PMS）.On the basis of the motor bearing data,the simulation is carried *** at the non-stationary of bearing data,the empirical mode decomposition（EMD） is used to decompose the bearing data into stationary singles,and the intrinsic mode function（IMF） energy entropy is calculated as the feature of mechanical *** comparison with support vector regression machine（SVRM）,LSTM achieves a better result in the single-step prediction of mechanical *** shows that LSTM is superior in machine state prediction and monitoring.

关键词： LSTM mechanical state prediction EMD energy entropy

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MViewer： mobile phone spatiotemporal data viewer

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Frontiers of Computer Science 2014年第2期8卷 298-315页

作者： Jiansu PU siyuan liu Panpan XU Huamin QU Lionel M. NI Department of Computer Science Hong Kong University of Science and Technology Hong Kong 999077 China iLab Heinz College Carnegie Mellon University Pittsburgh PA 15601 USA

Nowadays movement patterns and people＇s be- havioral models are needed for traffic engineers and city plan- ners. These observations could be used to reason about mobil- ity and its sustainability and to support decision makers with reliable information. The very same knowledge about human diaspora and behavior extracted from these data is also valu- able to the urban planner, so as to localize new services, orga- nize logistics systems and to detect changes as they occur in the movement behavior. Moreover, it is interesting to inves- tigate movement in places like a shopping area or a working district either for commercial purposes or for improving the service quality. These kinds of tracking data are made avail- able by wireless and mobile communication technologies. It is now possible to record and collect a large amount of mobile phone calls in a city. Technologies for object tracking have recently become affordable and reliable and hence we were able to collect mobile phone data from a city in China from January 1, 2008 to December 31, 2008. The large amount of phone call records from mobile operators can be considered as life mates and sensors of persons to inform how many peo- ple are present in any given area and how many are entering or leaving. Each phone call record usually contains the caller and callee IDs, date and time, and the base station where the phone calls are made. As mobile phones are widely used in our daily life, many human behaviors can be revealed by an- alyzing mobile phone data. Through mobile phones, we can learn the information about locations, communications be- tween mobile phone users during their daily *** this work, we propose a comprehensive visual analysissystem named as MViewer, Mobile phone spatiotemporal data Viewer, which is the first system to visualize and analyze the population＇s mobility patterns from millions of phone call records. Our system consists of three major components： 1） visual analysis of user groups in

关键词： visual analysis mobility pattern mobile phone

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Complementary-Label Adversarial Domain Adaptation Fault Diagnosis Network under Time-Varying Rotational Speed and Weakly-Supervised Conditions

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Computers, Materials & Continua 2024年第4期79卷 761-777页

作者： siyuan liu Jinying Huang Jiancheng Ma Licheng Jing Yuxuan Wang School of Data Science and Technology North University of ChinaTaiyuan030051China School of Mechanical Engineering North University of ChinaTaiyuan030051China

Recent research in cross-domain intelligence fault diagnosis of machinery still has some problems,such as relatively ideal speed conditions and sample *** engineering practice,the rotational speed of the machine is often transient and time-varying,which makes the sample annotation increasingly ***,the number of samples collected from different health states is often *** deal with the above challenges,a complementary-label(CL)adversarial domain adaptation fault diagnosis network(CLADAN)is proposed under time-varying rotational speed and weakly-supervised *** the weakly supervised learning condition,machine prior information is used for sample annotation via cost-friendly complementary label learning.A diagnosticmodel learning strategywith discretized category probabilities is designed to avoidmulti-peak distribution of prediction *** adversarial training process,we developed virtual adversarial regularization(VAR)strategy,which further enhances the robustness of the model by adding adversarial perturbations in the target *** experiments on two case studies validated the superior performance of the proposed method.

关键词： Time-varying rotational speed weakly-supervised fault diagnosis domain adaptation

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Application and Regeneration of a Non-Aqueous System of Cu/HCl and DMF for the Oxidation of Hydrogen Sulfide in Natural Gas

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China Petroleum Processing & Petrochemical Technology 2023年第3期25卷 71-82页

作者： Wang Yingjie liu siyuan Wang Xuening liu Zhihao Chen Hongyuan Qiu Kui School of Chemistry and Chemical Engineering Chongqing University of Science and TechnologyChongqing 401331

A copper-based non-aqueous-phase desulfurization agent is prepared by adding CuCl_(2) to the solvent N,Ndimethylformamide(DMF).Static desulfurization experiments show that the agent has high ***,the desulfurization reaction leads to the formation of a copper sulfide *** is found that the addition of chloride ions in the form of hydrochloric acid or potassium chloride prevents the formation of copper sulfide,and elemental sulfur is precipitated *** efficient absorption of H2S by the Cu/HCl–DMF agent relies on the rapid coordination of Cu^(2+)with DMF,Cl^(−),and H2S molecules to form a[Cu(DMF)_(n−p)(HS−)_(p)(Cl−)_(m)]_((2−p−m))+*** desulfurization agent has a sulfur capacity of up to 9.81 g/L when used in static bubble desulfurization at atmospheric *** system has low viscosity and good chemical and thermal *** can be rapidly regenerated through continuous *** five repetitions of the regeneration procedure,the sulfur capacity reaches more than 91%of the initial capacity,indicating the potential of the system for commercial applications.

关键词： hydrogen sulfide removal wet oxidation DMF CuCl_(2)

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Sensitizing effect of Nd^(3+) on Tb^(3+) activated ZrP_(2)O_(7) long persistent phosphor materials

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Journal of Rare Earths 2021年第7期39卷 757-764,I0001页

作者： Meihua Wu Wen Chen siyuan liu Yichao Sun Lingfeng Huang Guoliang Chen Zishan Zheng School of Chemistry Chemical Engineering&EnvironmentMinnan Normal UniversityZhangzhou 363000China

The long persistent phosphors of Zr_(0.97)P_(2)O_(7):0.018 Tb^(3+),0.012 Nd^(3+)with Nd^(3+)as sensitized ions and Tb^(3+)as emission centers were synthesized using high temperature solid state *** crystal structure and defects,excitation and emission spectra,decay curves and thermoluminescence(TL) curves of the phosphors were *** synthesized Zr_(0.97)P_(2)O_(7):0.018 Tb^(3+),0.012 Nd^(3+)is essentially in line with the standard card PDF#*** emission band with main peak at 548 nm exhibits the characteristic transitions of ^(5)D_(3)-^(7)F_(j)(j=5,4) and ^(5)D_(3)-^(7)F_(j)(j=6,5,4,3) of Tb^(3+).The analysis of excitation and emission spectra shows that there exists the overlap between the emission peaks of Nd^(3+)at 466 and 485 nm and the excitation of Tb^(3+)at 443 and 485 nm,and the energy transfer from Nd^(3+)to Tb^(3+)plays an important role in the improvement of luminescence *** decay curves shows that Zr_(0.97)P_(2)O_(7):0.018 Tb^(3+),0.012 Nd^(3+)has longer afterglow time than ZrP_(2)O_(7) and Zr_(0.982)P_(2)O_(7):0.018 Tb^(3+).Additionally,the TL curves indicate that the trap depth at 0.72 eV in Zr_(0.97)P_(2)O_(7):0.018 Tb^(3+),0.012 Nd^(3+)is to the benefit of the afterglow *** possible luminescence mechanism of ZrP_(2)O_(7):Tb^(3+),Nd^(3+)is proposed on the basis of the XPS spectra,EPR spectra,excitation and emission spectra,decay curves,TL curves and the analysis of defect equations.

关键词： ZrP_(2)O_(7) Tb^(3+) Nd^(3+) Sensitizer Energy transfer Rare earths

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