The paper had discussed connotation of landscape art,analyzed its study direction and content,and pointed out that landscape art should be involved in landscape design.Characteristics of landscape design manifested in...The paper had discussed connotation of landscape art,analyzed its study direction and content,and pointed out that landscape art should be involved in landscape design.Characteristics of landscape design manifested in three aspects:perfect combination between art and technology;being of public participation by manifesting public spirit and social responsibility as lying in public space;interdisciplinary subject.On this basis,design of landscape art had been conducted from the perspectives of design content,principle and technique.It pointed out that the content of landscape art design was pervasive,including all factors in place environment;and landscape art design should follow five principles as landscape and architectural design,which were integrity,publicity,timeliness,humanity and ecology.As for design techniques,it should pay attention to integration of aesthetic concept,reference from formal beauty,and expression of practice language.Explanation of aesthetics,evaluation on value and significance of landscape artistic works could guide landscape art.展开更多
Based on a level set model, a topology optimization method has been suggestedrecently. It uses a level set to express the moving structural boundary, which can flexibly handlecomplex topological changes. By combining ...Based on a level set model, a topology optimization method has been suggestedrecently. It uses a level set to express the moving structural boundary, which can flexibly handlecomplex topological changes. By combining vector level set models with gradient projectiontechnology, the level set method for topological optimization is extended to a topologicaloptimization problem with multi-constraints, multi-materials and multi-load cases. Meanwhile, anappropriate nonlinear speed, mapping is established in the tangential space of the activeconstraints for a fast convergence. Then the method is applied to structure designs, mechanism andmaterial designs by a number of benchmark examples. Finally, in order to further improvecomputational efficiency and overcome the difficulty that the level set method cannot generate newmaterial interfaces during the optimization process, the topological derivative analysis isincorporated into the level set method for topological optimization, and a topological derivativeand level set algorithm for topological optimization is proposed.展开更多
For the simultaneous wireless information and power transfer(SWIPT), the full-duplex MIMO system can achieve simultaneous transmission of information and energy more efficiently than the half-duplex. Based on the mean...For the simultaneous wireless information and power transfer(SWIPT), the full-duplex MIMO system can achieve simultaneous transmission of information and energy more efficiently than the half-duplex. Based on the mean-square-error(MSE) criterion, the optimization problem of joint transceiver design with transmitting power constraint and energy harvesting constraint is formulated. Next, by semidefinite relaxation(SDR) and randomization method, the SDRbased scheme is proposed. In order to reduce the complexity, the closed-form scheme is presented with some simplified measures. Robust beamforming is then studied considering the practical condition. The simulation results such as MSE versus signal-noise-ratio(SNR), MSE versus the iteration number, well prove the performance of the proposed schemes for the system model.展开更多
Polynomial-time randomized algorithms were constructed to approximately solve optimal robust performance controller design problems in probabilistic sense and the rigorous mathematical justification of the approach wa...Polynomial-time randomized algorithms were constructed to approximately solve optimal robust performance controller design problems in probabilistic sense and the rigorous mathematical justification of the approach was given. The randomized algorithms here were based on a property from statistical learning theory known as (uniform) convergence of empirical means (UCEM). It is argued that in order to assess the performance of a controller as the plant varies over a pre-specified family, it is better to use the average performance of the controller as the objective function to be optimized, rather than its worst-case performance. The approach is illustrated to be efficient through an example.展开更多
为提高迷彩伪装图案的设计效率和环境适应性,利用背景拼接与纹理模板融合进行迷彩伪装图案的全自动化设计。通过将输入的若干背景图像自动组合为单张拼接图像,采用均值聚类法提取出背景拼接图像的主色;提出4种迷彩纹理模板自动设计方法...为提高迷彩伪装图案的设计效率和环境适应性,利用背景拼接与纹理模板融合进行迷彩伪装图案的全自动化设计。通过将输入的若干背景图像自动组合为单张拼接图像,采用均值聚类法提取出背景拼接图像的主色;提出4种迷彩纹理模板自动设计方法(多圆形随机分布法、WGN傅里叶频谱法、肌理图像生成法及分层云彩法),再对所得迷彩纹理模板进行色彩聚类与色彩替换,得到最终的迷彩伪装图案。为验证设计的有效性,针对丛林虚拟场景自动生成了4种伪装图案,并进行了伪装效果的主观和客观评价。结果表明,上述方法仅需17.0~71.0 s即可完成针对目标背景的迷彩图案设计,且最优方案为基于多圆形随机分布法纹理模板的迷彩图案;本文方法相对于普通迷彩伪装,其主观评价搜索时间增加了8.1%,基于Positioning and Focus Network(PF-Net)模型的客观评价发现概率降低了45%。展开更多
Although the Cramer-Rao Bound(CRB) can be used as the benchmark of estimation algorithm performance,it's too complicated for joint training sequence(TS) design for multiple input multiple output(MIMO) orthogonal f...Although the Cramer-Rao Bound(CRB) can be used as the benchmark of estimation algorithm performance,it's too complicated for joint training sequence(TS) design for multiple input multiple output(MIMO) orthogonal frequency division multiplexing(OFDM) coordination on multiple point(CoMP) systems.So a minimum mean square error(MSE) based sub-optimal sequence design criterion was proposed,including ideal sequence correlation property and sequence length constraint.The simulation results verify the theory analysis.展开更多
基金Supported by the Fundamental Research Funds for the Central Universities(SWJTU11BR154)~~
文摘The paper had discussed connotation of landscape art,analyzed its study direction and content,and pointed out that landscape art should be involved in landscape design.Characteristics of landscape design manifested in three aspects:perfect combination between art and technology;being of public participation by manifesting public spirit and social responsibility as lying in public space;interdisciplinary subject.On this basis,design of landscape art had been conducted from the perspectives of design content,principle and technique.It pointed out that the content of landscape art design was pervasive,including all factors in place environment;and landscape art design should follow five principles as landscape and architectural design,which were integrity,publicity,timeliness,humanity and ecology.As for design techniques,it should pay attention to integration of aesthetic concept,reference from formal beauty,and expression of practice language.Explanation of aesthetics,evaluation on value and significance of landscape artistic works could guide landscape art.
基金This project is supported by National Natural Science Foundation of China(No.598005001, No.10332010) and Key Science and Technology Research Project of Ministry of Education (No.104060).
文摘Based on a level set model, a topology optimization method has been suggestedrecently. It uses a level set to express the moving structural boundary, which can flexibly handlecomplex topological changes. By combining vector level set models with gradient projectiontechnology, the level set method for topological optimization is extended to a topologicaloptimization problem with multi-constraints, multi-materials and multi-load cases. Meanwhile, anappropriate nonlinear speed, mapping is established in the tangential space of the activeconstraints for a fast convergence. Then the method is applied to structure designs, mechanism andmaterial designs by a number of benchmark examples. Finally, in order to further improvecomputational efficiency and overcome the difficulty that the level set method cannot generate newmaterial interfaces during the optimization process, the topological derivative analysis isincorporated into the level set method for topological optimization, and a topological derivativeand level set algorithm for topological optimization is proposed.
基金supported by the National Great Science Specif ic Project (Grants No. 2014ZX03002002-004)National Natural Science Foundation of China (Grants No. NSFC-61471067)
文摘For the simultaneous wireless information and power transfer(SWIPT), the full-duplex MIMO system can achieve simultaneous transmission of information and energy more efficiently than the half-duplex. Based on the mean-square-error(MSE) criterion, the optimization problem of joint transceiver design with transmitting power constraint and energy harvesting constraint is formulated. Next, by semidefinite relaxation(SDR) and randomization method, the SDRbased scheme is proposed. In order to reduce the complexity, the closed-form scheme is presented with some simplified measures. Robust beamforming is then studied considering the practical condition. The simulation results such as MSE versus signal-noise-ratio(SNR), MSE versus the iteration number, well prove the performance of the proposed schemes for the system model.
文摘Polynomial-time randomized algorithms were constructed to approximately solve optimal robust performance controller design problems in probabilistic sense and the rigorous mathematical justification of the approach was given. The randomized algorithms here were based on a property from statistical learning theory known as (uniform) convergence of empirical means (UCEM). It is argued that in order to assess the performance of a controller as the plant varies over a pre-specified family, it is better to use the average performance of the controller as the objective function to be optimized, rather than its worst-case performance. The approach is illustrated to be efficient through an example.
文摘为提高迷彩伪装图案的设计效率和环境适应性,利用背景拼接与纹理模板融合进行迷彩伪装图案的全自动化设计。通过将输入的若干背景图像自动组合为单张拼接图像,采用均值聚类法提取出背景拼接图像的主色;提出4种迷彩纹理模板自动设计方法(多圆形随机分布法、WGN傅里叶频谱法、肌理图像生成法及分层云彩法),再对所得迷彩纹理模板进行色彩聚类与色彩替换,得到最终的迷彩伪装图案。为验证设计的有效性,针对丛林虚拟场景自动生成了4种伪装图案,并进行了伪装效果的主观和客观评价。结果表明,上述方法仅需17.0~71.0 s即可完成针对目标背景的迷彩图案设计,且最优方案为基于多圆形随机分布法纹理模板的迷彩图案;本文方法相对于普通迷彩伪装,其主观评价搜索时间增加了8.1%,基于Positioning and Focus Network(PF-Net)模型的客观评价发现概率降低了45%。
基金International Science&Technology Cooperation Projects of Qinghai,China(Nos.2013-H-811,2014-HZ-821)Chunhui Plan Projects,China(Nos.Z2014013,Z2014014)
文摘Although the Cramer-Rao Bound(CRB) can be used as the benchmark of estimation algorithm performance,it's too complicated for joint training sequence(TS) design for multiple input multiple output(MIMO) orthogonal frequency division multiplexing(OFDM) coordination on multiple point(CoMP) systems.So a minimum mean square error(MSE) based sub-optimal sequence design criterion was proposed,including ideal sequence correlation property and sequence length constraint.The simulation results verify the theory analysis.
