In order to decrease model complexity of rice panicle for its complicated morphological structure,an interactive L-system based on substructure algorithm was proposed to model rice panicle in this study.Through the an...In order to decrease model complexity of rice panicle for its complicated morphological structure,an interactive L-system based on substructure algorithm was proposed to model rice panicle in this study.Through the analysis of panicle morphology,the geometrical structure models of panicle spikelet,axis and branch were constructed firstly.Based on that,an interactive panicle L-system model was developed by using substructure algorithm to optimize panicle geometrical models with the similar structure.Simulation results showed that the interactive L-system panicle model based on substructure algorithm could fast construct panicle morphological structure in reality.In addition,this method had the well reference value for other plants model research.展开更多
This paper constructs a tree model by using the 3D stochastic and L system with brackets. Adjusting the range of the parameters, the present method ensures a favorable randomness and reflects the reality and the real ...This paper constructs a tree model by using the 3D stochastic and L system with brackets. Adjusting the range of the parameters, the present method ensures a favorable randomness and reflects the reality and the real time. Based on a simple mechanical model, the simulation of the phenomenon of wind swaying trees satisfies visual effects well.展开更多
Vessel segmentation plays a crucial role in the diagnosis of many diseases,as well as assisting surgery.With the development of deep learning,many segmentation methods have been proposed,and the results have become mo...Vessel segmentation plays a crucial role in the diagnosis of many diseases,as well as assisting surgery.With the development of deep learning,many segmentation methods have been proposed,and the results have become more and more accurate.However,most of these methods are based on supervised learning,which require a large amount of labeled data as training data.To overcome this shortcoming,unsupervised and self-supervised methods have also received increasing attention.In this paper,we generate a synthetic training datasets through L-system,and utilize adversarial learning to narrow the distribution difference between the generated data and the real data to obtain the ultimate network.Our method achieves state-of-the-art(SOTA)results on X-ray angiography artery disease(XCAD)by a large margin of nearly 10.4%.展开更多
In this paper, we revisit foundations of the applications of physical measurement and Lindenmayer system to the modeling of plants. The measurement is proposed to a formal procedure and measuring the mass of leaves on...In this paper, we revisit foundations of the applications of physical measurement and Lindenmayer system to the modeling of plants. The measurement is proposed to a formal procedure and measuring the mass of leaves on a tree, tailored to branching plant structures with Simpson＇ s rule and Monte Carlo Methods. L-system is possible to visualize mathematical models of biological structures and processes. The formalism is illustrated using theoretical branching systems, and applied to analyze total leaves number as well as total weight of them.展开更多
L波段数字航空通信系统(L-band digital aeronautical communication system,LDACS)作为未来航空数据链的重要技术手段之一,非常容易受到相邻波道的测距机系统信号的干扰。为此,提出一种基于稀疏贝叶斯推断的LDACS波束形成方法。首先,将...L波段数字航空通信系统(L-band digital aeronautical communication system,LDACS)作为未来航空数据链的重要技术手段之一,非常容易受到相邻波道的测距机系统信号的干扰。为此,提出一种基于稀疏贝叶斯推断的LDACS波束形成方法。首先,将LDACS地面站的粗略来向信息作为先验,并根据空域信号来向的稀疏性构建稀疏信号。随后,通过贝叶斯推断估算干扰和噪声的功率,估计各个信源的来向。最后,重构干扰噪声协方差矩阵,获得波束形成权矢量。该方法无需知晓干扰数量、干扰来向等信息。仿真结果表明,该方法在低信噪比和少快拍条件下也能稳定输出波束方向图,表现出较好性能。展开更多
基金Supported by National Natural Science Foundation of China(60802040)Youth Fund in Southwest University of Science and Technology(10zx3106)~~
文摘In order to decrease model complexity of rice panicle for its complicated morphological structure,an interactive L-system based on substructure algorithm was proposed to model rice panicle in this study.Through the analysis of panicle morphology,the geometrical structure models of panicle spikelet,axis and branch were constructed firstly.Based on that,an interactive panicle L-system model was developed by using substructure algorithm to optimize panicle geometrical models with the similar structure.Simulation results showed that the interactive L-system panicle model based on substructure algorithm could fast construct panicle morphological structure in reality.In addition,this method had the well reference value for other plants model research.
文摘This paper constructs a tree model by using the 3D stochastic and L system with brackets. Adjusting the range of the parameters, the present method ensures a favorable randomness and reflects the reality and the real time. Based on a simple mechanical model, the simulation of the phenomenon of wind swaying trees satisfies visual effects well.
基金supported in part by the National Key Research and Development Program of China(No.2022YFA1004703)the National Natural Science Foundation of China(No.61873262).
文摘Vessel segmentation plays a crucial role in the diagnosis of many diseases,as well as assisting surgery.With the development of deep learning,many segmentation methods have been proposed,and the results have become more and more accurate.However,most of these methods are based on supervised learning,which require a large amount of labeled data as training data.To overcome this shortcoming,unsupervised and self-supervised methods have also received increasing attention.In this paper,we generate a synthetic training datasets through L-system,and utilize adversarial learning to narrow the distribution difference between the generated data and the real data to obtain the ultimate network.Our method achieves state-of-the-art(SOTA)results on X-ray angiography artery disease(XCAD)by a large margin of nearly 10.4%.
文摘In this paper, we revisit foundations of the applications of physical measurement and Lindenmayer system to the modeling of plants. The measurement is proposed to a formal procedure and measuring the mass of leaves on a tree, tailored to branching plant structures with Simpson＇ s rule and Monte Carlo Methods. L-system is possible to visualize mathematical models of biological structures and processes. The formalism is illustrated using theoretical branching systems, and applied to analyze total leaves number as well as total weight of them.
文摘L波段数字航空通信系统(L-band digital aeronautical communication system,LDACS)作为未来航空数据链的重要技术手段之一,非常容易受到相邻波道的测距机系统信号的干扰。为此,提出一种基于稀疏贝叶斯推断的LDACS波束形成方法。首先,将LDACS地面站的粗略来向信息作为先验,并根据空域信号来向的稀疏性构建稀疏信号。随后,通过贝叶斯推断估算干扰和噪声的功率,估计各个信源的来向。最后,重构干扰噪声协方差矩阵,获得波束形成权矢量。该方法无需知晓干扰数量、干扰来向等信息。仿真结果表明,该方法在低信噪比和少快拍条件下也能稳定输出波束方向图,表现出较好性能。
