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Measuring Social Vulnerability to Natural Hazards in Beijing-Tianjin-Hebei Region,China

Chinese Geographical Science 2015年第4期25卷 472-485页

作者： HUANG Jianyi su fei ZHANG Pingyu College of Art and Science Beijing Union University School of Tourism and City Administration Zhejiang Gongshang University Northeast Institute of Geography and Agroecology Chinese Academy of Sciences

Social vulnerability in this study represents the differences between the capacity to cope with natural hazards and disaster losses suffered within and between *** assessment of social vulnerability has been recognized as a critical step in understanding natural hazard risks and enhancing effective response *** article presents an initial study of the social vulnerability of the Beijing-Tianjin-Hebei(B-T-H) Region in *** goal is to replicate and test the applicability of the United States Social Vulnerability Index(So VI) method in a Chinese cultural ***-nine variables adapted from the So VI were collected in relation to two aspects:socioeconomic vulnerability and built environment *** factor analysis,seven factors were extracted from the variable set:the structure of social development,the level of economic and government financial strength,social justice and poverty,family structure,the intensity of space development,the status of residential housing and transportation,and building *** scores were summed to get the final So VI scores and the most and least vulnerable units were identified and *** highest social vulnerability is concentrated in the northwest of the study *** least socially vulnerable areas are mainly distributed in the Beijing,Tianjin and Shijiazhuang core urban peripheral and central city areas of the prefecture-level *** results show that this method is a useful tool for revealing places that have a high level of vulnerability,in other words,areas which are more likely to face significant challenges in coping with a large-scale *** findings could provide a scientific basis for policy making and the implementation of disaster prevention and mitigation in China.

关键词： natural hazards social vulnerability factor analysis Beijing-Tianjin-Hebei Region

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Modeling and analysis of Internet worm propagation

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The Journal of China Universities of Posts and Telecommunications 2010年第4期17卷 63-68页

作者： su fei LIN Zhao-wen MA Yan Institute of Networking Technology Beijing University of Posts and Telecommunications Beijing 100876 China Beijing Key Laboratory of Intelligent Telecommtmications Software and Multimedia Beijing University of Posts and Telecommunications Beijing 100876 China

Although the frequency of Internet worm＇s outbreak is decreased during the past ten years, the impact of worm on people＇s privacy security and enterprise＇s efficiency is still a severe problem, especially the emergence of botnet. It is urgent to do more research about worm＇s propagation model and security defense. The well-known worm models, such as simple epidemic model （SEM） and two-factor model （TFM）, take all the computers on the internet as the same, which is not accurate because of the existence of network address translation （NAT）. In this paper, we first analyze the worm＇s functional structure, and then we propose a three layer worm model named three layres worm model （TLWM）, which is an extension of SEM and TFM under NAT environment. We model the TLWM by using deterministic method as it is used in the TFM. The simulation results show that the number of NAT used on the Internet has effects on worm propagation, and the more the NAT used, the slower the worm spreads. So, the extensive use of NAT on the Internet can restrain the worm spread to some extent.

关键词： worm propagation model TLWM NAT

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Iterative selection algorithm for service composition in distributed environments

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Science in China(Series F) 2008年第11期51卷 1841-1856页

作者： su Sen LI fei YANG FangChun State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China

In service oriented architecture （SOA）, service composition is a promising way to create new services. However, some technical challenges are hindering the application of service composition. One of the greatest challenges for composite service provider is to select a set of services to instantiate composite service with end- to-end quality of service （QoS） assurance across different autonomous networks and business regions. This paper presents an iterative service selection algorithm for quality driven service composition. The algorithm runs on a peer-to-peer （P2P） service execution environment--distributed intelligent service execution （DISE）, which provides scalable QoS registry, dynamic service selection and service execution services. The most significant feature of our iterative service selection algorithm is that it can work on a centralized QoS registry as well as cross decentralized ones. Network status is an optional factor in our QoS model and selection algorithm. The algorithm iteratively selects services following service execution order, so it can be applied either before service execution or at service run-time without any modification. We test our algorithm with a series of experiments on DISE. Experimental results illustrated its excellent selection and outstanding performance.

关键词： web service quality of service (QoS) service selection algorithm distributed QoS registry

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Progressive framework for deep neural networks: from linear to non-linear

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The Journal of China Universities of Posts and Telecommunications 2016年第6期23卷 1-7页

作者： Shao Jie Zhao Zhicheng su fei Cai Anni School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing Key Laboratory of Network System and Network Culture Beijing University of Posts and Telecommunications

We propose a novel progressive framework to optimize deep neural networks. The idea is to try to combine the stability of linear methods and the ability of learning complex and abstract internal representations of deep leaming methods. We insert a linear loss layer between the input layer and the first hidden non-linear layer of a traditional deep model. The loss objective for optimization is a weighted sum of linear loss of the added new layer and non-linear loss of the last output layer. We modify the model structure of deep canonical correlation analysis （DCCA）, i.e., adding a third semantic view to regularize text and image pairs and embedding the structure into our framework, for cross-modal retrieval tasks such as text-to-image search and image-to-text search. The experimental results show the performance of the modified model is better than similar state-of-art approaches on a dataset of National University of Singapore （NUS-WIDE）. To validate the generalization ability of our framework, we apply our framework to RankNet, a ranking model optimized by stochastic gradient descent. Our method outperforms RankNet and converges more quickly, which indicates our progressive framework could provide a better and faster solution for deep neural networks.

关键词： framework neural network DCCA semantic RankNet

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Fingerprint singular points extraction based on the properties of orientation model

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The Journal of China Universities of Posts and Telecommunications 2011年第1期18卷 98-104页

作者： su fei suN Peng WANG Bo-tao CAI An-ni School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing 100876 China Department of Automation Tsinghua University Beijing 100084 China College of Electronic Information and Control Engineering Beijing University of Technology Beijing 100124 China

A novel method for fingerprint singular points extraction including location and orientation is proposed based on some properties of the orientation field models. Singular points are located by clustering the results of corner detection. Then, through examining the sub-block orientation fields at a number of selected positions on concentric circles centered about the located singular point, an iterative method based on the orientation differences is proposed to compute the orientation of the core point. Experimental results on NIST4 and FVC2002 four databases demonstrate the proposed method can consistently locate singular points with the high accuracy. The location and orientation of the detected singular points can be used for alignment （translation and rotation） parameters in fingerprint matching.

关键词： fingerprint orientation model singular points core delta

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Anisotropy of two-dimensional ReS_(2)and advances in its device application

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Rare Metals 2021年第12期40卷 3357-3374页

作者： Ya-Di Cao Ying-Hui sun su-fei Shi Rong-Ming Wang Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface ScienceSchool of Mathematics and PhysicsUniversity of Science and Technology BeijingBeijing100083China Department of Chemical and Biological Engineering Rensselaer Polytechnic InstituteTroyNY 12180USA Department of Electrical Computer and Systems EngineeringRensselaer Polytechnic InstituteTroyNY 12180USA

Two-dimensional(2D)transition metal dichalcogenides(TMDCs)have attracted growing interest regarding their potential applications in next-generation electronic and optoelectronic *** to their atomic thickness and tunable bandgap,they exhibit unique mechanical,electrical,and optical *** a specific member of the TMDC family,rhenium disulfide(ReS_(2))has stimulated intensive interest due to its anisotropic crystal structure,weak inter-layer coupling,and anisotropic electrical and optical *** this review,we summarize the distinct crystal structure and intrinsic anisotropic properties of ReS_(2),followed by an introduction to its synthesis *** current applications of ReS_(2)and its heterojunctions are presented based on its anisotropic *** review not only provides a timely summary of the current applications of ReS_(2)and its heterojunctions,but also inspires new approaches to develop other innovative devices based on 2D materials with a low lattice symmetry.

关键词： Transition metal dichalcogenides(TMDCs) Rhenium disulfide Anisotropic property Heterojunction Functional device

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Fluorescent silicon nanoparticle-based gene carriers featuring strong photostability and feeble cytotoxicity

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Nano Research 2016年第10期9卷 3027-3037页

作者： Jingyang Pang Yuanyuan su Yiling Zhong fei Peng Bin Song Yao He Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices Institute of Functional Nano and Soft Materials (FUNSOM)Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University Suzhou 215123 China

Safe fluorescent gene-transfection vectors are in great demand for basic biological applications and for gene-therapy research. Here, we introduce a new type of luminescent silicon nanoparticle （SiNP）-based gene carrier suitable for determining the intracellular fate of the gene vehicle in a long-term and real-time manner. The presented SiNP-based nanocarriers simultaneously feature strong and stable fluorescence, high DNA-loading capacity and gene-transfection efficienc35 as well as favorable biocompafibility. Taking advantage of these unique benefits, we were able to readily observe the behavior of the gene carriers in live cells （e.g. cellular uptake, intracellular trafficking, and endosomal escape） in a long-term and real- time manner. The results demonstrate the potential usability of these fluorescent SiNP-based gene vectors as powerful tools in the field of gene therapy, and provide invaluable information for understanding the intracellular behavior of gene carriers.

关键词： fluorescent silicon nanoparficles gene delivery biocompatibility long-term and real-time tracking

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The revised distance of supernova remnant G15.4+0.1

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Research in Astronomy and Astrophysics 2017年第10期17卷 109-112页

作者： Hong-Quan su Meng-fei Zhang Hui Zhu Dan Wu Key Laboratory of Optical Astronomy National Astronomical Observatories Chinese Academy of Sciences University of Chinese Academy of Sciences International Centre for Radio Astronomy Research Curtin University College of Information Science & Technology Beijing Normal University

We measure the distance to the supernova remnant G15.4±0.1 which is likely associated with TeV source HESS J1818-154. We build the neutral hydrogen （HI） absorption and 13CO spectra for supernova remnant G 15.4±0.1 by employing data from the Southern Galactic Plane survey （SGPS） and the HI/OH/Recombination line survey （THOR）. The maximum absorption velocity of about 140 km s-1 constrains the lower limit of its distance to about 8.0 kpc. Further, the fact that the HI emission feature at about 95 km s-1 seems to have no corresponding absorption suggests that G 15.4±0.1 likely has an upper limit for distance of about 10.5 kpc. The 13CO spectrum for the remnant supports our measurement. The new distance provides revised parameters on its associated pulsar wind nebula and TeV source.

关键词： ISM: supernova remnants -- methods: data analysis -- stars: distances

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FINGERPRINT-BASED KEY BINDING/RECOVERING SCHEME BASED ON FUZZY VAULT

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Journal of Electronics(China) 2008年第3期25卷 415-421页

作者： Feng Quan su fei Cai Anni School of Telecommunication Engineering Beijing University of Posts and Telecommunications Beijing 100876 China School of Engineering Gansu Agricultural University Lanzhou 730070 China

This letter proposes fingerprint-based key binding/recovering with fuzzy vault. Fingerprint minutiae data and the cryptographic key are merged together by a multivariable linear function. First, the minutiae data are bound by a set of random data through the linear function. The number of the function’s variables is determined by the required number of matched minutiae. Then, a new key de- rived from the random data is used to encrypt the cryptographic key. Lastly, the binding data are protected using fuzzy vault scheme. The proposed scheme provides the system with the flexibility to use changeable number of minutiae to bind/recover the protected key and a unified method regardless of the length of the key.

关键词： binding Key recovering Fingerprint minutiae Fuzzy vault Multivariable linear function

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Cystic fibrosis transmembrane conductance regulator prevents ischemia/reperfusion induced intestinal apoptosis via inhibiting PI3K/AKT/NF-κB pathway

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World Journal of Gastroenterology 2022年第9期28卷 918-932页

作者： Zhi-Wei Dong Hui Liu fei-fei su Xiao-Zhou Fan Yong Zhang Peng Liu Department of General surgery Air Force Medical CenterBeijing 100000China Department of Gastroenterology Second Affiliated Hospital of Dalian Medical UniversityDalian 116023Liaoning ProvinceChina Department of Cardiology Air Force Medical CenterBeijing 100000China Department of Ultrasound Air Force Medical CenterBeijing 100000China School of Chemistry and Biological Engineering University of Science and TechnologyBeijing 100000China Research Laboratory of Aero-Medical support Air Force Medical CenterBeijing 100000China

BACKGROUND Intestinal ischemia/reperfusion(I/R)injury is a fatal syndrome that occurs under many clinical *** apoptosis of intestinal cells caused by ischemia can cause cell damage and provoke systemic dysfunction during ***,the mechanism of I/R-induced apoptosis remains *** fibrosis transmembrane conductance regulator(CFTR)is a cAMP-activated chloride *** researchers have paid attention to its role in intestinal I/R injury,or the relationship between CFTR and intestinal apoptosis induced by hypoxia/reoxygenation(H/R).AIM To investigate the effects of CFTR on I/R-induced intestinal apoptosis and its underlying molecular *** An intestinal I/R injury model was established in mice with superior mesenteric artery occlusion, and Caco2 cells were subjected to H/R for the simulation of I/R in *** results suggested that CFTR overexpression significantly increased the Caco2 cell viability anddecreased cell apoptosis induced by the H/R. Interestingly, we found that the translocation of p65,an NF-κB member, from the cytoplasm to the nucleus after H/R treatment can be reversed by theoverexpression of CFTR, the NF-κB P65 would return from the nucleus to the cytoplasm asdetermined by immunostaining. We also discovered that CFTR inhibited cell apoptosis in theH/R-treated cells, and this effect was significantly curbed by the NF-κB activator BA, AKTinhibitor GSK690693 and the PI3K inhibitor LY294002. Moreover, we demonstrated that CFTRoverexpression could reverse the decreased PI3K/AKT expression induced by the I/R treatment invivo or H/R treatment in *** results of the present study indicate that the overexpression of CFTR protects Caco2 cells fromH/R-induced apoptosis;furthermore, it also inhibits H/R-induced apoptosis through thePI3K/AKT/NF-κB signaling pathway in H/R-treated Caco2 cells and intestinal tissues.

关键词： Apoptosis Cystic fibrosis transmembrane conductance regulator Intestinal ischemia-reperfusion injury PI3K/AKT/NF-κB Hypoxia/reoxygenation Caco2 cells

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