针对知识图谱稀疏实体间关系缺失和学习效率低的问题,提出了一种改进的知识图谱补全方法I_IterE(improved-iteratively learning embeddings and rules).首先,在IterE模型的表示学习层与规则学习层之间增加了特征层,采用add方法将表示...针对知识图谱稀疏实体间关系缺失和学习效率低的问题,提出了一种改进的知识图谱补全方法I_IterE(improved-iteratively learning embeddings and rules).首先,在IterE模型的表示学习层与规则学习层之间增加了特征层,采用add方法将表示学习层学到的关系特征进行增强,并生成新关系特征;然后,在规则学习层将新的关系特征与改进的评分机制相结合进行公理的分数计算,该分数用于判断公理的可信度;最后,利用高分公理进行演绎推理从而获得与稀疏实体相关的新三元组.采用公共数据集WN18-sparse,WN18RR-sparse,FB15k-sparse和FB15k-237-sparse进行链接预测和规则评估.实验结果表明,该方法在MRR、Hits@n和规则评估指标上均取得较好的提升,将该方法应用到航空安全事件数据集上,在显著提升链接预测效果的同时,为航空安全事件知识图谱的补全提供了方法支撑.展开更多
On the basis of the measurement of 210Pbex and 137Cs activities in the sediment cores taken from the intertidal zone on the west coast of the Bohai Gulf, the average sedimentation rates of modern sediments are calcula...On the basis of the measurement of 210Pbex and 137Cs activities in the sediment cores taken from the intertidal zone on the west coast of the Bohai Gulf, the average sedimentation rates of modern sediments are calculated. The results indicate that in the sandy area of the intertidal zone (from Daogouzi to the Duliujian River), the sedimentation rate from 1955 to 1963 is 3.43-4.06 cm/a, and is within the range of 0.65￣1.59 cm/a since 1963. The average sedimentation rate in the muddy area (around Qikou) is approximately 1.81 cm/a. The results above suggest that the sandy area of the intertidal zone has experienced rapid sedimentation from the 1950s to the 1960s, and the sedimentation slows down after the 1960s, and the sedimentation rates increase from north to south spatially. The rapid sedi- mentation from the 1950s to the 1960s in the sandy area is due to the fact that North China has plentiful precipitation during this period and the intertidal zone is supplied with abundant matter sources for sedimentation. After the 1960s, the weakened sedimentation may be a result of the reduction of sand transported to the intertidal zone, which is a consequence of diminished rainfall in North China and intensive human activities in the Haihe basin.展开更多
The deficiencies of the first threshold Guilbu-Quisquater signature schemepresented by Li-San Liu, Cheng-Kang Chu and Wen-Guey Tzeng arc analysiscd at first, and then a newthreshold Guillou-Quisquater signature scheme...The deficiencies of the first threshold Guilbu-Quisquater signature schemepresented by Li-San Liu, Cheng-Kang Chu and Wen-Guey Tzeng arc analysiscd at first, and then a newthreshold Guillou-Quisquater signature scheme is presented. The new scheme isunforgeable and robustagainst any adaptive adversary if the base Guillou-Quisquater signature scheme is unforgeable underthe chosen message attack and computing the discrete logarithm modulo a prime is hard This schemecan also achieve optimal resilience. However, the new scheme does not need the assumption that N isthe product of two safe primes. The basie signature scheme underlying the new scheme is exactlyGuillou-Quisqualtr signature scheme, and the additional strong computation assumption introduced bythe first threshold Guillou-Quisquater scheme is weaken.展开更多
Based on the historical evolution of the Hangzhou Bay, by making use of the conclusions made by the previous research workers and the integration of concrete data, five distinct impact indicators of the sediment from ...Based on the historical evolution of the Hangzhou Bay, by making use of the conclusions made by the previous research workers and the integration of concrete data, five distinct impact indicators of the sediment from the Changjiang Estuary and the East China Sea to the Hangzhou Bay are summarized. Numerical calculation and analysis indicate that the scouring and deposition of seabed in the Hangzhou Bay are subject to the direct impact of the evolution of the Changjiang Estuary, and the growth and decline and the direction of the sandy bar at Nanhuizui give traces to the sediment transport between the Changjiang Estuary and the Hangzhou Bay. The transport of sediment from the Changjiang Estuary to the Hangzhou Bay occurs mainly in winter and spring seasons and the increase of the Changjiang River runoff and the decrease of sediment charge have caused scouring in the northern coast of the Hangzhou Bay and the seabed erosion along the frontal margin of the Changjiang River Delta.展开更多
Experiments including two in laboratory and one in greenhouse were carried out to study non- exchangeable magnesium release from fluvo-aquic soils sampled from Daxing and changping counties located in the suburbs of B...Experiments including two in laboratory and one in greenhouse were carried out to study non- exchangeable magnesium release from fluvo-aquic soils sampled from Daxing and changping counties located in the suburbs of Beijing and Mg relative availability of the two soils to plants. In a batch experiment in laboratory the soils were incubated under wet conditions and alternation of dry and wet conditions and determined for amount of Mg released at the 4th, 8th and 12th week, respectively, after extraction of exchangeable Mg with 1 mol L-1 NH4Ac. The amount of Mg released from the soil of Daxing was higher than from the soil of Changping, which was in accordance with the fact that the soil of Daxing had higher contents of all forms of Mg than that of Changping. There was little difference in Mg release from soils between wet conditions and alternation of dry and wet conditions. About 1%~2% of the total non-exchangeable Mg might be released within 12 weeks of incubation, restoring about 30%~35% of the original soil exchangeable Mg. Results of the experiment on kinetics of Mg release from the soils through continuous extractions with 0.5 mol L-1 NH4Ac (pH 7.0) on a continuous flow apparatus in laboratory showed that Mg released rapidly in the beginning, decreased sharply with time and kept stable at 60 and 240 min for the soils of Changping and Daxing, respectively. Among the five mathematical models used to describe the kinetics of Mg release, the parabolic diffusion equation best fitted the cumulative Mg release, indicating that diffusion of Mg out of the soils might be the controlling process. The experiment of exhaustive cropping with 1 crop of tomato (Lycopersicon esculentum Mill.) followed by six crops of corn (Zea mays L.) in greenhouse showed that soil exchangeable Mg decreased remarkably with cropping. After three crops, the percentage of the total plant Mg uptake that came from soil non-exchangeable Mg was 29.5% for the soil from Changping and 35% for the soil from Daxing. About 50% of the total Mg uptake by plants in the six crops was believed to come from the soil non-exchangeable Mg form.展开更多
This paper aims at multi_scale representation of urban GIS,presenting a model to dynamically generalize the building on the basis of Delaunay triangulation model.Considering the constraints of position accuracy,statis...This paper aims at multi_scale representation of urban GIS,presenting a model to dynamically generalize the building on the basis of Delaunay triangulation model.Considering the constraints of position accuracy,statistical area balance and orthogonal characteristics in building cluster generalization,this paper gives a progressive algorithm of building cluster aggregation,including conflict detection (where),object (who) displacement,and geometrical combination operation (how).The algorithm has been realized in an interactive generalization system and some experiment illustrations are provided.展开更多
Two kinds of saturated controllers are designed for a class of feedforward systems andthe closed-loop resulted is locally input-to-state stable and input-to-state stable, respectively. By theword “locally”, it is me...Two kinds of saturated controllers are designed for a class of feedforward systems andthe closed-loop resulted is locally input-to-state stable and input-to-state stable, respectively. By theword “locally”, it is meant that there are restrictions on the amplitude of inputs. At first, underthe guidance of suitable energy functions, two kinds of saturated controllers are designed as locallyinput-to-state stabilizers for a class of perturbed linear systems, from which explicit gain estimationscan be obtained for the subsequent design. Then under the conditions that two subsystems of thefeedforward system are respectively of locally input-to-state stability and input-to-state stability, thesmall gain theory is used to determine saturated degrees for corresponding robust stabilizers. Thestability proofs are given by using a new characterization of input-to-state stability that is based onthe concept of ultimate boundedness. As an application, saturated controllers are designed for thepartial dynamics of a certain inverted pendulum.展开更多
A nonlinear model predictive control problem based on pseudo-linear neural network (PNN) is discussed, in which the second order on-line optimization method is adopted. The recursive computation of Jacobian matrix is ...A nonlinear model predictive control problem based on pseudo-linear neural network (PNN) is discussed, in which the second order on-line optimization method is adopted. The recursive computation of Jacobian matrix is investigated. The stability of the closed loop model predictive control system is analyzed based on Lyapunov theory to obtain the sufficient condition for the asymptotical stability of the neural predictive control system. A simulation was carried out for an exothermic first-order reaction in a continuous stirred tank reactor.It is demonstrated that the proposed control strategy is applicable to some of nonlinear systems.展开更多
This paper introduces overall policy and economic environment for power industry in China. Thepolicy environment tends to be favorable, while the economic environment seems worrisome. The latter ismainly due to energy...This paper introduces overall policy and economic environment for power industry in China. Thepolicy environment tends to be favorable, while the economic environment seems worrisome. The latter ismainly due to energy transportation blocking and price escalating. The paper also introduces the performanceand development of listed power companies, and points out that the power stock market is still promising andpower industry is still valuable for investment.展开更多
An optical model accounting for the East Asian dust is proposed as a result of theory calculation and compo-sition analysis of the aerosol samples collected in China de-sert during the international project, Studies o...An optical model accounting for the East Asian dust is proposed as a result of theory calculation and compo-sition analysis of the aerosol samples collected in China de-sert during the international project, Studies on the Origin and Transport of Aeolian Dust and its Effects on Climate (ADEC). Study indicates that dust aerosols emitting from China deserts have smaller imaginary parts of refractive indices, therefore absorb less and scatter more solar radia-tion than the most dust optical models published so far. Fur-thermore, the forward fraction of scattering is less and the backscattering is stronger than those of the other models. The seasonal averaged radiative forcing in spring, 2001 over east Asia-north Pacific region is simulated employing the new dust optical model. The net forcing at the top of atmos-phere (TOA) is estimated as -0.943 W·m-2 for regional and seasonal mean, with shortwave and longwave contributions of -1.700 and 0.759 W·m-2, respectively. The surface net forcing is calculated to be -5.445 W·m-2, and made up of shortwave component of -6.250 W·m-2 and longwave component of +0.759 W·m-2. The distributions of TOA and surface net forcing over this region are also analyzed in this study.展开更多
This is an annotated bibliography of language policies and language education in East Asia. The book contains abstracts of some 500 papers by researchers from 16 different countries and regions in East Asia. Among the...This is an annotated bibliography of language policies and language education in East Asia. The book contains abstracts of some 500 papers by researchers from 16 different countries and regions in East Asia. Among them. “Papers on ELT” are recorded and abstracted in most of 16 “country sections”. The book is well organised and is a versatile research tool. It has filled a blank in the field of applied linguistics in a regional purview. For researchers and students in the field of applied linguistics, this annotated bibliography provides an excellent starting point to conceive or design a research project.展开更多
文摘针对知识图谱稀疏实体间关系缺失和学习效率低的问题,提出了一种改进的知识图谱补全方法I_IterE(improved-iteratively learning embeddings and rules).首先,在IterE模型的表示学习层与规则学习层之间增加了特征层,采用add方法将表示学习层学到的关系特征进行增强,并生成新关系特征;然后,在规则学习层将新的关系特征与改进的评分机制相结合进行公理的分数计算,该分数用于判断公理的可信度;最后,利用高分公理进行演绎推理从而获得与稀疏实体相关的新三元组.采用公共数据集WN18-sparse,WN18RR-sparse,FB15k-sparse和FB15k-237-sparse进行链接预测和规则评估.实验结果表明,该方法在MRR、Hits@n和规则评估指标上均取得较好的提升,将该方法应用到航空安全事件数据集上,在显著提升链接预测效果的同时,为航空安全事件知识图谱的补全提供了方法支撑.
基金financed by the Hi-tech Research and Development Program of China(“863”Program)under contract No.2002AA648010
文摘On the basis of the measurement of 210Pbex and 137Cs activities in the sediment cores taken from the intertidal zone on the west coast of the Bohai Gulf, the average sedimentation rates of modern sediments are calculated. The results indicate that in the sandy area of the intertidal zone (from Daogouzi to the Duliujian River), the sedimentation rate from 1955 to 1963 is 3.43-4.06 cm/a, and is within the range of 0.65￣1.59 cm/a since 1963. The average sedimentation rate in the muddy area (around Qikou) is approximately 1.81 cm/a. The results above suggest that the sandy area of the intertidal zone has experienced rapid sedimentation from the 1950s to the 1960s, and the sedimentation slows down after the 1960s, and the sedimentation rates increase from north to south spatially. The rapid sedi- mentation from the 1950s to the 1960s in the sandy area is due to the fact that North China has plentiful precipitation during this period and the intertidal zone is supplied with abundant matter sources for sedimentation. After the 1960s, the weakened sedimentation may be a result of the reduction of sand transported to the intertidal zone, which is a consequence of diminished rainfall in North China and intensive human activities in the Haihe basin.
文摘The deficiencies of the first threshold Guilbu-Quisquater signature schemepresented by Li-San Liu, Cheng-Kang Chu and Wen-Guey Tzeng arc analysiscd at first, and then a newthreshold Guillou-Quisquater signature scheme is presented. The new scheme isunforgeable and robustagainst any adaptive adversary if the base Guillou-Quisquater signature scheme is unforgeable underthe chosen message attack and computing the discrete logarithm modulo a prime is hard This schemecan also achieve optimal resilience. However, the new scheme does not need the assumption that N isthe product of two safe primes. The basie signature scheme underlying the new scheme is exactlyGuillou-Quisqualtr signature scheme, and the additional strong computation assumption introduced bythe first threshold Guillou-Quisquater scheme is weaken.
文摘Based on the historical evolution of the Hangzhou Bay, by making use of the conclusions made by the previous research workers and the integration of concrete data, five distinct impact indicators of the sediment from the Changjiang Estuary and the East China Sea to the Hangzhou Bay are summarized. Numerical calculation and analysis indicate that the scouring and deposition of seabed in the Hangzhou Bay are subject to the direct impact of the evolution of the Changjiang Estuary, and the growth and decline and the direction of the sandy bar at Nanhuizui give traces to the sediment transport between the Changjiang Estuary and the Hangzhou Bay. The transport of sediment from the Changjiang Estuary to the Hangzhou Bay occurs mainly in winter and spring seasons and the increase of the Changjiang River runoff and the decrease of sediment charge have caused scouring in the northern coast of the Hangzhou Bay and the seabed erosion along the frontal margin of the Changjiang River Delta.
文摘Experiments including two in laboratory and one in greenhouse were carried out to study non- exchangeable magnesium release from fluvo-aquic soils sampled from Daxing and changping counties located in the suburbs of Beijing and Mg relative availability of the two soils to plants. In a batch experiment in laboratory the soils were incubated under wet conditions and alternation of dry and wet conditions and determined for amount of Mg released at the 4th, 8th and 12th week, respectively, after extraction of exchangeable Mg with 1 mol L-1 NH4Ac. The amount of Mg released from the soil of Daxing was higher than from the soil of Changping, which was in accordance with the fact that the soil of Daxing had higher contents of all forms of Mg than that of Changping. There was little difference in Mg release from soils between wet conditions and alternation of dry and wet conditions. About 1%~2% of the total non-exchangeable Mg might be released within 12 weeks of incubation, restoring about 30%~35% of the original soil exchangeable Mg. Results of the experiment on kinetics of Mg release from the soils through continuous extractions with 0.5 mol L-1 NH4Ac (pH 7.0) on a continuous flow apparatus in laboratory showed that Mg released rapidly in the beginning, decreased sharply with time and kept stable at 60 and 240 min for the soils of Changping and Daxing, respectively. Among the five mathematical models used to describe the kinetics of Mg release, the parabolic diffusion equation best fitted the cumulative Mg release, indicating that diffusion of Mg out of the soils might be the controlling process. The experiment of exhaustive cropping with 1 crop of tomato (Lycopersicon esculentum Mill.) followed by six crops of corn (Zea mays L.) in greenhouse showed that soil exchangeable Mg decreased remarkably with cropping. After three crops, the percentage of the total plant Mg uptake that came from soil non-exchangeable Mg was 29.5% for the soil from Changping and 35% for the soil from Daxing. About 50% of the total Mg uptake by plants in the six crops was believed to come from the soil non-exchangeable Mg form.
文摘This paper aims at multi_scale representation of urban GIS,presenting a model to dynamically generalize the building on the basis of Delaunay triangulation model.Considering the constraints of position accuracy,statistical area balance and orthogonal characteristics in building cluster generalization,this paper gives a progressive algorithm of building cluster aggregation,including conflict detection (where),object (who) displacement,and geometrical combination operation (how).The algorithm has been realized in an interactive generalization system and some experiment illustrations are provided.
文摘Two kinds of saturated controllers are designed for a class of feedforward systems andthe closed-loop resulted is locally input-to-state stable and input-to-state stable, respectively. By theword “locally”, it is meant that there are restrictions on the amplitude of inputs. At first, underthe guidance of suitable energy functions, two kinds of saturated controllers are designed as locallyinput-to-state stabilizers for a class of perturbed linear systems, from which explicit gain estimationscan be obtained for the subsequent design. Then under the conditions that two subsystems of thefeedforward system are respectively of locally input-to-state stability and input-to-state stability, thesmall gain theory is used to determine saturated degrees for corresponding robust stabilizers. Thestability proofs are given by using a new characterization of input-to-state stability that is based onthe concept of ultimate boundedness. As an application, saturated controllers are designed for thepartial dynamics of a certain inverted pendulum.
文摘A nonlinear model predictive control problem based on pseudo-linear neural network (PNN) is discussed, in which the second order on-line optimization method is adopted. The recursive computation of Jacobian matrix is investigated. The stability of the closed loop model predictive control system is analyzed based on Lyapunov theory to obtain the sufficient condition for the asymptotical stability of the neural predictive control system. A simulation was carried out for an exothermic first-order reaction in a continuous stirred tank reactor.It is demonstrated that the proposed control strategy is applicable to some of nonlinear systems.
文摘This paper introduces overall policy and economic environment for power industry in China. Thepolicy environment tends to be favorable, while the economic environment seems worrisome. The latter ismainly due to energy transportation blocking and price escalating. The paper also introduces the performanceand development of listed power companies, and points out that the power stock market is still promising andpower industry is still valuable for investment.
文摘An optical model accounting for the East Asian dust is proposed as a result of theory calculation and compo-sition analysis of the aerosol samples collected in China de-sert during the international project, Studies on the Origin and Transport of Aeolian Dust and its Effects on Climate (ADEC). Study indicates that dust aerosols emitting from China deserts have smaller imaginary parts of refractive indices, therefore absorb less and scatter more solar radia-tion than the most dust optical models published so far. Fur-thermore, the forward fraction of scattering is less and the backscattering is stronger than those of the other models. The seasonal averaged radiative forcing in spring, 2001 over east Asia-north Pacific region is simulated employing the new dust optical model. The net forcing at the top of atmos-phere (TOA) is estimated as -0.943 W·m-2 for regional and seasonal mean, with shortwave and longwave contributions of -1.700 and 0.759 W·m-2, respectively. The surface net forcing is calculated to be -5.445 W·m-2, and made up of shortwave component of -6.250 W·m-2 and longwave component of +0.759 W·m-2. The distributions of TOA and surface net forcing over this region are also analyzed in this study.
文摘This is an annotated bibliography of language policies and language education in East Asia. The book contains abstracts of some 500 papers by researchers from 16 different countries and regions in East Asia. Among them. “Papers on ELT” are recorded and abstracted in most of 16 “country sections”. The book is well organised and is a versatile research tool. It has filled a blank in the field of applied linguistics in a regional purview. For researchers and students in the field of applied linguistics, this annotated bibliography provides an excellent starting point to conceive or design a research project.
