This paper describes a novel method of online composite shape recognition interms of the relevance feedback technology to capture a user's intentions incrementally, and adynamic user modeling method to adapt to va...This paper describes a novel method of online composite shape recognition interms of the relevance feedback technology to capture a user's intentions incrementally, and adynamic user modeling method to adapt to various users' styles. First, the relevance feedback isadapted to refine the recognition results and reduce the ambiguity incrementally based on theestablishment of a feature-based vector model of a user's sketches. Secondly, a dynamic usermodeling is introduced to model the user's sketching habits based on recording and analyzinghistorical information incrementally. A model-based matching strategy is also employed in the methodto recognize sketches dynamically. Experiments prove that the proposed method is both effective andefficient.展开更多
This paper aims at investigating the efficacy of different state-of-art damage detection methods when applied to real worm structures subjected to ground motion excitations, for which the literature contributions are,...This paper aims at investigating the efficacy of different state-of-art damage detection methods when applied to real worm structures subjected to ground motion excitations, for which the literature contributions are, at present, still not fully comprehensive. To this purpose the paper analyses two test structures: (1) a four-story scaled steel frame tested on a shake table in a controlled laboratory conditions, and (2) a seven-story reinforced concrete building monitored during the seismic excitations of the 1999 Chi-Chi (Taiwan) Earthquake main shock and numerous fore and afiershocks. Some model based damage approaches and statistics based damage indexes are reviewed. The different methodologies and indexes are, then, applied to the two test structures with the final aim of analysing their performance and validity within the case of a laboratory scaled model and a real world structure subjected to input ground motion.展开更多
To better improve the emergency communication and location-based services of disaster information reporting network for serious natural response and relieL disaster emergency the national natural disaster reduction ap...To better improve the emergency communication and location-based services of disaster information reporting network for serious natural response and relieL disaster emergency the national natural disaster reduction application platform based on BeiDou navigation satellite system is constructed. The administrative distributed platform is integrated with BeiDou positioning and multiple communication ways so as to achieve main disaster reduction application services, including disaster information acquisition and monitoring, emergency relief for trapped people, on-site emergency relief command service, relief supplies' transportation monitoring, and disaster information publishing service. By the platform, serious disaster information reporting time may be reduced to one hour and the emergency decision-making information service for serious natural disasters can be effectively improved, and it will be helpful to provide technical references for the industrial application and promotion of BeiDou inte- grated disaster reduction.展开更多
Quality degradation occurs during transmission of video streaming over the error-prone network. By jointly using redundant slice, reference frame selection, and intra/inters mode decision, a content and end-to-end rat...Quality degradation occurs during transmission of video streaming over the error-prone network. By jointly using redundant slice, reference frame selection, and intra/inters mode decision, a content and end-to-end rate-distortion based error resilience method is proposed. Firstly, the intra/inter mode decision is implemented using macro-block(MB) refresh, and then redundant picture and reference frame selection are utilized together to realize the redundant coding. The estimated error propagation distortion and bit consumption of refresh MB are used for the mode and reference frame decision of refresh MB. Secondly, by analyzing the statistical property in the successive frames, the error propagation distortion and bit consumption are formulated as a function of temporal distance. Encoding parameters of the current frame is determined by the estimated error propagation distortion and bit consumption. Thirdly, by comparing the rate-distortion cost of different combinations, proper selection of error resilience method is performed before the encoding process of the current frame. Finally, the MB mode and bit distribution of the primary picture are analyzed for the derivation of the texture information. The motion information is subsequently incorporated for the calculation of video content complexity to implement the content based redundant coding. Experimental results demonstrate that the proposed algorithm achieves significant performance gains over the LA-RDO and HRP method when video is transmitted over error-prone channel.展开更多
Location aware management and location based automation are fast upcoming technologies which are facilitated by availability of reliable, accurate, and cheap global positioning systems and location based services. Thi...Location aware management and location based automation are fast upcoming technologies which are facilitated by availability of reliable, accurate, and cheap global positioning systems and location based services. This paper discusses the development of C++ classes, which may be used for development of software for location aware management and control, specifically in merchant shipping, so as to provide improved safety, increased automation, prevention of pollution and reducing the work burden of the crew. The GPS is used in conjunction with the regionally accessible nested global shorelines (RANGS) dataset for this purpose. The design of two main C++ classes named CShorelines and CGPSInput have been discussed. A control system mandatory on all oil-tankers above 150 GRT (and few other vessels) called ODMCS has been made location aware using the novel software developed and the results obtained have been critically examined and presented.展开更多
The frequent occurrence of extreme flood events in the late 1990s and the past decade has brought about an ongoing debate on the relationships between wetland resources, wetland ecosystem services, and human developme...The frequent occurrence of extreme flood events in the late 1990s and the past decade has brought about an ongoing debate on the relationships between wetland resources, wetland ecosystem services, and human development and livelihoods of communities in the Dongting Lake area. This paper is prepared for analysing the best practices in wise-use and sustainable management of wetland and their socioeconomic benefits in Polder Xipanshanzhou in Dongting Lake. The quantitative (monetary values) and qualitative socioeconomic data of 1683 samples from questionnaire surveys during 2000 to 2008 were used for this study, of which 1173 were obtained in Polder Xipanshanzhou. Five conclusions are drawn from the study: (i) the community-based alternative activities and wise-use in Polder Xipanshanzhou after "Returning Farmland to Lake" (RFL) resulted in more income, increased well-being, reduced vulnerability to food shortage, poverty and flooding, and more sustainable use of the natural resource base; (ii) women, elder farmers, and low-income groups benefited much more from these activities; (iii) livelihood continued to improve as compared with that when the project started in 2000, and project participating households earned more income and owned more properties than non-project households. Even after the external funding stopped in 2001, its positive accumulated effects have still been significantly contributing to the improvement of livelihoods of this community; (iv) social structures within Polder Xipanshanzhou have been evolving in a positive way, community-based grass-roots organizations have emerged and developed well, and the capacities of community-based participatory co-management, self-governing and self- development, as well as local awareness of environmental issues have been improving, which attract more local people to be interested in such wise-use activities; and (v) the success can be attributed to the mobilization of local communities, favorable national policies, Public-Private Partnership (PPP), institutional arrangements in local communities, and adaptive management and innovative approaches.展开更多
This paper attempts to reveal and solve problems in language teaching after discussing the issues of language change. It first discusses different models of English in the context of globalization. With detailed analy...This paper attempts to reveal and solve problems in language teaching after discussing the issues of language change. It first discusses different models of English in the context of globalization. With detailed analysis of their theoretical backgrounds, development and foundations, this paper classifies these models into three groups: dualism (i.e., dualic model), trinalism (trinalic model) and monism (monic model). Through comparison, Yoneoka’s English Umbrella Theory is found to be more comprehensive and is improved into a practical Revised English Umbrella (REU) with the notion of English as an International Language (EIL). Second, the changing models in English education are briefly reviewed. Attention is paid to the Computer and Classroom-Based (CCB) Model of College English education because of new requirements for College English education. Students’ competence in cross-cultural communication is becoming more and more important in the EIL context. Finally, a modified CCB model is promoted with the REU, combining EIL and English Umbrella elements.展开更多
The regional verification of soil moisture is a vital step in evaluating and improving numerical model performance and utilizing forecast results. Currently, even with improved spatial and temporal resolutions of nume...The regional verification of soil moisture is a vital step in evaluating and improving numerical model performance and utilizing forecast results. Currently, even with improved spatial and temporal resolutions of numerical model, verification methods for soil moisture data still rely on the traditional intensity verification parameters, such as mean error(ME) and root-mean-squared error(RMSE). Those methods provide only incomplete and sometimes inaccurate messages and thus hinder a proper evaluation of a forecast model. The SAL method is an object-based regional verification method with respect to precipitation forecasts. Based on the SAL method, a novel object-based method(SAL-DN) is proposed here, which can be used to test regional soil moisture. Both the ideal experiment and real experiment show that the SAL-DN method can reveal the differences between the observed and forecast soil moisture in three aspects: structure, amplitude, and location, and the results can reflect the actual situation. Furthermore, compared with the SAL method, the SAL-DN method is also capable of verifying physical quantities with high-value and low-value centers like temperature. Therefore, the SAL-DN method enhances verification accuracy and can be applied widely.展开更多
Neighbor discovery is important for docking applications,where mobile nodes communicate with static nodes situated at various rendezvous points.Among the existing neighbor discovery protocols,the probabilistic methods...Neighbor discovery is important for docking applications,where mobile nodes communicate with static nodes situated at various rendezvous points.Among the existing neighbor discovery protocols,the probabilistic methods perform well in average cases but they have aperiodic,unpredictable,and unbounded discovery latency.Yet,deterministic protocols can provide bounded worst-case discovery latency by sacrificing the average-case performance.In this study,we propose a mobility-assisted slot index synchronization(MASS),which is a new synchronization technique that can improve the average-case performance of deterministic neighbor discovery protocols via slot index synchronization without incurring additional energy consumption.Furthermore,we propose an optimized beacon strategy in MASS to mitigate beaconing collisions,which can lead to discovery failures in situations where multiple neighbors are in the vicinity.We evaluate MASS with theoretical analysis and simulations using real traces from a tourist tracking system deployed at the Mogao Grottoes,which is a famous cultural heritage site in China.We show that MASS can reduce the average discovery latency of state-of-the-art deterministic neighbor discovery protocols by up to two orders of magnitude.展开更多
Spatially explicit modeling techniques recently emerged as an alternative to monitor land use changes. This study adopted the well-known CLUE-S(Conversion of Land Use and its Effects at Small regional extent) model to...Spatially explicit modeling techniques recently emerged as an alternative to monitor land use changes. This study adopted the well-known CLUE-S(Conversion of Land Use and its Effects at Small regional extent) model to analyze the spatio-temporal land use changes in a hot-spot in Northeast China(NEC). In total,13 driving factors were selected to statistically analyze the spatial relationships between biophysical and socioeconomic factors and individual land use types. These relationships were then used to simulate land use dynamic changes during 1980–2010 at a 1 km spatial resolution,and to capture the overall land use change patterns. The obtained results indicate that increases in cropland area in NEC were mainly distributed in the Sanjiang Plain and the Songnen Plain during 1980–2000,with a small reduction between 2000 and 2010. An opposite pattern was identified for changes in forest areas. Forest decreases were mainly distributed in the Khingan Mountains and the Changbai Mountains between 1980 and 2000,with a slight increase during 2000–2010. The urban areas have expanded to occupy surrounding croplands and grasslands,particularly after the year 2000. More attention is needed on the newly gained croplands,which have largely replaced wetlands in the Sanjiang Plain over the last decade. Land use change patterns identified here should be considered in future policy making so as to strengthen local eco-environmental security.展开更多
Pushover analysis is common because of its conceptual simplicity and computational attractiveness in computing seismic demand.Considering that traditional pushover analysis is restricted in underground structures due ...Pushover analysis is common because of its conceptual simplicity and computational attractiveness in computing seismic demand.Considering that traditional pushover analysis is restricted in underground structures due to the stark differences in the seismic response characteristics of surface structures,this paper proposes a pushover analysis method for underground structures and its application in seismic damage assessment.First,three types of force distribution are presented based on ground response analysis.Next,the target displacements and analysis models are established according to force-based and performance-based design.Then,the pushover analysis procedure for underground structures is described.Next,the applicability of pushover analysis to underground structures is verified by comparing the responses of a Chongwenmen subway station determined by the proposed procedure and by nonlinear response history analysis.In addition,two other points are made:that the inverted triangular distribution of effective earthquake acceleration is more practical than the other two distributions,and that performance-based design is more effective than force-based design.Finally,a cyclic reversal loading pattern based on one cycle of reversal loads as an earthquake event is presented and applied to the seismic damage assessment of underground structures.The results show that the proposed pushover analysis can be effectively applied to the seismic design and damage assessment of underground structures.展开更多
文摘This paper describes a novel method of online composite shape recognition interms of the relevance feedback technology to capture a user's intentions incrementally, and adynamic user modeling method to adapt to various users' styles. First, the relevance feedback isadapted to refine the recognition results and reduce the ambiguity incrementally based on theestablishment of a feature-based vector model of a user's sketches. Secondly, a dynamic usermodeling is introduced to model the user's sketching habits based on recording and analyzinghistorical information incrementally. A model-based matching strategy is also employed in the methodto recognize sketches dynamically. Experiments prove that the proposed method is both effective andefficient.
文摘This paper aims at investigating the efficacy of different state-of-art damage detection methods when applied to real worm structures subjected to ground motion excitations, for which the literature contributions are, at present, still not fully comprehensive. To this purpose the paper analyses two test structures: (1) a four-story scaled steel frame tested on a shake table in a controlled laboratory conditions, and (2) a seven-story reinforced concrete building monitored during the seismic excitations of the 1999 Chi-Chi (Taiwan) Earthquake main shock and numerous fore and afiershocks. Some model based damage approaches and statistics based damage indexes are reviewed. The different methodologies and indexes are, then, applied to the two test structures with the final aim of analysing their performance and validity within the case of a laboratory scaled model and a real world structure subjected to input ground motion.
基金supported by National Bei Dou Special Project and National Science & Technology planning project of China (Grant No. 2014BAK12B04)
文摘To better improve the emergency communication and location-based services of disaster information reporting network for serious natural response and relieL disaster emergency the national natural disaster reduction application platform based on BeiDou navigation satellite system is constructed. The administrative distributed platform is integrated with BeiDou positioning and multiple communication ways so as to achieve main disaster reduction application services, including disaster information acquisition and monitoring, emergency relief for trapped people, on-site emergency relief command service, relief supplies' transportation monitoring, and disaster information publishing service. By the platform, serious disaster information reporting time may be reduced to one hour and the emergency decision-making information service for serious natural disasters can be effectively improved, and it will be helpful to provide technical references for the industrial application and promotion of BeiDou inte- grated disaster reduction.
基金Project(40927001)supported by the National Natural Science Foundation of ChinaProject(2011R09021-06)supported by the Program of Key Scientific and Technological Innovation Team of Zhejiang Province,ChinaProject supported by the Fundamental Research Funds for the Central Universities of China
文摘Quality degradation occurs during transmission of video streaming over the error-prone network. By jointly using redundant slice, reference frame selection, and intra/inters mode decision, a content and end-to-end rate-distortion based error resilience method is proposed. Firstly, the intra/inter mode decision is implemented using macro-block(MB) refresh, and then redundant picture and reference frame selection are utilized together to realize the redundant coding. The estimated error propagation distortion and bit consumption of refresh MB are used for the mode and reference frame decision of refresh MB. Secondly, by analyzing the statistical property in the successive frames, the error propagation distortion and bit consumption are formulated as a function of temporal distance. Encoding parameters of the current frame is determined by the estimated error propagation distortion and bit consumption. Thirdly, by comparing the rate-distortion cost of different combinations, proper selection of error resilience method is performed before the encoding process of the current frame. Finally, the MB mode and bit distribution of the primary picture are analyzed for the derivation of the texture information. The motion information is subsequently incorporated for the calculation of video content complexity to implement the content based redundant coding. Experimental results demonstrate that the proposed algorithm achieves significant performance gains over the LA-RDO and HRP method when video is transmitted over error-prone channel.
文摘Location aware management and location based automation are fast upcoming technologies which are facilitated by availability of reliable, accurate, and cheap global positioning systems and location based services. This paper discusses the development of C++ classes, which may be used for development of software for location aware management and control, specifically in merchant shipping, so as to provide improved safety, increased automation, prevention of pollution and reducing the work burden of the crew. The GPS is used in conjunction with the regionally accessible nested global shorelines (RANGS) dataset for this purpose. The design of two main C++ classes named CShorelines and CGPSInput have been discussed. A control system mandatory on all oil-tankers above 150 GRT (and few other vessels) called ODMCS has been made location aware using the novel software developed and the results obtained have been critically examined and presented.
基金National Natural Science Foundation of China (grant number: 30670374)National Basic Research Program of China (973 Program): Ecosystem Services and Ecological Safety of the Major Terrestrial Ecosystems of China (grant number: 2009CB421106)WWF (World Wide Fund for Nature) International Collaboration Program: Wetland Ecosystem Assessment and Management in Dongting Lake (grant number: CN0088.03-YB01/02/03/04)
文摘The frequent occurrence of extreme flood events in the late 1990s and the past decade has brought about an ongoing debate on the relationships between wetland resources, wetland ecosystem services, and human development and livelihoods of communities in the Dongting Lake area. This paper is prepared for analysing the best practices in wise-use and sustainable management of wetland and their socioeconomic benefits in Polder Xipanshanzhou in Dongting Lake. The quantitative (monetary values) and qualitative socioeconomic data of 1683 samples from questionnaire surveys during 2000 to 2008 were used for this study, of which 1173 were obtained in Polder Xipanshanzhou. Five conclusions are drawn from the study: (i) the community-based alternative activities and wise-use in Polder Xipanshanzhou after "Returning Farmland to Lake" (RFL) resulted in more income, increased well-being, reduced vulnerability to food shortage, poverty and flooding, and more sustainable use of the natural resource base; (ii) women, elder farmers, and low-income groups benefited much more from these activities; (iii) livelihood continued to improve as compared with that when the project started in 2000, and project participating households earned more income and owned more properties than non-project households. Even after the external funding stopped in 2001, its positive accumulated effects have still been significantly contributing to the improvement of livelihoods of this community; (iv) social structures within Polder Xipanshanzhou have been evolving in a positive way, community-based grass-roots organizations have emerged and developed well, and the capacities of community-based participatory co-management, self-governing and self- development, as well as local awareness of environmental issues have been improving, which attract more local people to be interested in such wise-use activities; and (v) the success can be attributed to the mobilization of local communities, favorable national policies, Public-Private Partnership (PPP), institutional arrangements in local communities, and adaptive management and innovative approaches.
文摘This paper attempts to reveal and solve problems in language teaching after discussing the issues of language change. It first discusses different models of English in the context of globalization. With detailed analysis of their theoretical backgrounds, development and foundations, this paper classifies these models into three groups: dualism (i.e., dualic model), trinalism (trinalic model) and monism (monic model). Through comparison, Yoneoka’s English Umbrella Theory is found to be more comprehensive and is improved into a practical Revised English Umbrella (REU) with the notion of English as an International Language (EIL). Second, the changing models in English education are briefly reviewed. Attention is paid to the Computer and Classroom-Based (CCB) Model of College English education because of new requirements for College English education. Students’ competence in cross-cultural communication is becoming more and more important in the EIL context. Finally, a modified CCB model is promoted with the REU, combining EIL and English Umbrella elements.
基金supported by National Natural Science Foundation of China(Grant Nos.41205009 and 41175046)Opening Fund of Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions,Chinese Academy of Sciences(Grant No.LPCC201102)
文摘The regional verification of soil moisture is a vital step in evaluating and improving numerical model performance and utilizing forecast results. Currently, even with improved spatial and temporal resolutions of numerical model, verification methods for soil moisture data still rely on the traditional intensity verification parameters, such as mean error(ME) and root-mean-squared error(RMSE). Those methods provide only incomplete and sometimes inaccurate messages and thus hinder a proper evaluation of a forecast model. The SAL method is an object-based regional verification method with respect to precipitation forecasts. Based on the SAL method, a novel object-based method(SAL-DN) is proposed here, which can be used to test regional soil moisture. Both the ideal experiment and real experiment show that the SAL-DN method can reveal the differences between the observed and forecast soil moisture in three aspects: structure, amplitude, and location, and the results can reflect the actual situation. Furthermore, compared with the SAL method, the SAL-DN method is also capable of verifying physical quantities with high-value and low-value centers like temperature. Therefore, the SAL-DN method enhances verification accuracy and can be applied widely.
基金Project supported by the National High-Tech R&D Program of China(No.2012AA101701)the National Key Technology Support Program of China(Nos.2013BAK01B00 and2014BAK16B00)Grotto Temples Digital Protection of Cultural Relics and Equipment Upgrading of National Cultural Heritage Administration Scientific Research Institutes
文摘Neighbor discovery is important for docking applications,where mobile nodes communicate with static nodes situated at various rendezvous points.Among the existing neighbor discovery protocols,the probabilistic methods perform well in average cases but they have aperiodic,unpredictable,and unbounded discovery latency.Yet,deterministic protocols can provide bounded worst-case discovery latency by sacrificing the average-case performance.In this study,we propose a mobility-assisted slot index synchronization(MASS),which is a new synchronization technique that can improve the average-case performance of deterministic neighbor discovery protocols via slot index synchronization without incurring additional energy consumption.Furthermore,we propose an optimized beacon strategy in MASS to mitigate beaconing collisions,which can lead to discovery failures in situations where multiple neighbors are in the vicinity.We evaluate MASS with theoretical analysis and simulations using real traces from a tourist tracking system deployed at the Mogao Grottoes,which is a famous cultural heritage site in China.We show that MASS can reduce the average discovery latency of state-of-the-art deterministic neighbor discovery protocols by up to two orders of magnitude.
基金National Natural Science Foundation of China No.41201089No.41271112+3 种基金The Fundamental Research Funds for the Central UniversitiesNo.CCNU15A05058National Nonprofit Institute Research Grant of CAASNo.IARRP-2015-28
文摘Spatially explicit modeling techniques recently emerged as an alternative to monitor land use changes. This study adopted the well-known CLUE-S(Conversion of Land Use and its Effects at Small regional extent) model to analyze the spatio-temporal land use changes in a hot-spot in Northeast China(NEC). In total,13 driving factors were selected to statistically analyze the spatial relationships between biophysical and socioeconomic factors and individual land use types. These relationships were then used to simulate land use dynamic changes during 1980–2010 at a 1 km spatial resolution,and to capture the overall land use change patterns. The obtained results indicate that increases in cropland area in NEC were mainly distributed in the Sanjiang Plain and the Songnen Plain during 1980–2000,with a small reduction between 2000 and 2010. An opposite pattern was identified for changes in forest areas. Forest decreases were mainly distributed in the Khingan Mountains and the Changbai Mountains between 1980 and 2000,with a slight increase during 2000–2010. The urban areas have expanded to occupy surrounding croplands and grasslands,particularly after the year 2000. More attention is needed on the newly gained croplands,which have largely replaced wetlands in the Sanjiang Plain over the last decade. Land use change patterns identified here should be considered in future policy making so as to strengthen local eco-environmental security.
基金supported by the Tsinghua Initiative Scientific Research Program(Grant No.2012THZ02-2)Beijing Natural Science Foundation(Grant No.8111001)+1 种基金National Basic Research Program of China(Grant No.2011CB013602)Major Research Plan of the National Natural Science Foundation of China(Grant No.91215301)
文摘Pushover analysis is common because of its conceptual simplicity and computational attractiveness in computing seismic demand.Considering that traditional pushover analysis is restricted in underground structures due to the stark differences in the seismic response characteristics of surface structures,this paper proposes a pushover analysis method for underground structures and its application in seismic damage assessment.First,three types of force distribution are presented based on ground response analysis.Next,the target displacements and analysis models are established according to force-based and performance-based design.Then,the pushover analysis procedure for underground structures is described.Next,the applicability of pushover analysis to underground structures is verified by comparing the responses of a Chongwenmen subway station determined by the proposed procedure and by nonlinear response history analysis.In addition,two other points are made:that the inverted triangular distribution of effective earthquake acceleration is more practical than the other two distributions,and that performance-based design is more effective than force-based design.Finally,a cyclic reversal loading pattern based on one cycle of reversal loads as an earthquake event is presented and applied to the seismic damage assessment of underground structures.The results show that the proposed pushover analysis can be effectively applied to the seismic design and damage assessment of underground structures.