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A descent method for the Dubins traveling salesman problem with neighborhoods Research Articles

Zheng Chen, Chen-hao Sun, Xue-ming Shao, Wen-jie Zhao,z_chen@zju.edu.cn,mecsxm@zju.edu.cn

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 5,   Pages 615-766 doi: 10.1631/FITEE.2000041

Abstract: In this study, we focus mainly on the problem of finding the minimum-length path through a set of circular regions by a fixed-wing unmanned aerial vehicle. Such a problem is referred to as the with neighborhoods (DTSPN). Algorithms developed in the literature for solving DTSPN either are computationally demanding or generate low-quality solutions. To achieve a better trade-off between solution quality and computational cost, an efficient gradient-free is designed. The core idea of the is to decompose DTSPN into a series of subproblems, each of which consists of finding the minimum-length path of a from a configuration to another configuration via an intermediate circular region. By analyzing the geometric properties of the subproblems, we use a bisection method to solve the subproblems. As a result, the can efficiently address DTSPN by successively solving a series of subproblems. Finally, several numerical experiments are carried out to demonstrate the in comparison with several existing algorithms.

Keywords： Dubins飞行器；坐标下降法；Dubins旅行商问题    

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Block coordinate descent with time perturbation for nonconvex nonsmooth problems in real-world studies Research Article

Rui Liu, Wei-chu Sun, Tao Hou, Chun-hong Hu, Lin-bo Qiao,liuruirui@csu.edu.cn,smsysun@foxmail.com,houtao@csu.edu.cn,huchunhong@csu.edu.cn,qiao.linbo@nudt.edu.cn

Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 10,   Pages 1390-1403 doi: 10.1631/FITEE.1900341

Abstract: The era of big data in healthcare is here, and this era will significantly improve medicine and especially oncology. However, traditional machine learning algorithms need to be promoted to solve such large-scale real-world problems due to a large amount of data that needs to be analyzed and the difficulty in solving problems with nonconvex nonlinear settings. We aim to minimize the composite of a smooth nonlinear function and a block-separable nonconvex function on a large number of block variables with inequality constraints. We propose a novel parallel first-order optimization method, called asynchronous block coordinate descent with (ATP), which adopts a technique that escapes from saddle points and sub-optimal local points. The details of the proposed method are presented with analyses of convergence and iteration complexity properties. Experiments conducted on real-world machine learning problems validate the efficacy of our proposed method. The experimental results demonstrate that enables ATP to escape from saddle points and sub-optimal points, providing a promising way to handle nonconvex optimization problems with inequality constraints employing asynchronous block coordinate descent. The asynchronous parallel implementation on shared memory multi-core platforms indicates that the proposed algorithm, ATP, has strong scalability.

Keywords： 收敛分析；异步块坐标下降法；时间扰动；非凸非平滑优化；真实世界研究    

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Fractional-order global optimal backpropagation machine trained by an improved fractional-order steepest descent method Research Articles

Yi-fei Pu, Jian Wang,puyifei@scu.edu.cn,wangjiannl@upc.edu.cn

Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 6,   Pages 809-962 doi: 10.1631/FITEE.1900593

Abstract: We introduce the fractional-order global optimal backpropagation machine, which is trained by an improved (FSDM). This is a fractional-order backpropagation neural network (FBPNN), a state-of-the-art fractional-order branch of the family of backpropagation neural networks (BPNNs), different from the majority of the previous classic first-order BPNNs which are trained by the traditional first-order steepest descent method. The reverse incremental search of the proposed FBPNN is in the negative directions of the approximate fractional-order partial derivatives of the square error. First, the theoretical concept of an FBPNN trained by an improved FSDM is described mathematically. Then, the mathematical proof of fractional-order global optimal convergence, an assumption of the structure, and of the FBPNN are analyzed in detail. Finally, we perform three (types of) experiments to compare the performances of an FBPNN and a classic first-order BPNN, i.e., example function approximation, , and comparison of global search and error fitting abilities with real data. The higher optimal search ability of an FBPNN to determine the global optimal solution is the major advantage that makes the FBPNN superior to a classic first-order BPNN.

Keywords： 分数阶微积分；分数阶反向传播算法；分数阶最速下降法；均方误差；分数阶多尺度全局优化    

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Numerical Computation of Flow and Pollutant Diffusion - Transportation With Non-orthogonal Curvilinear Coordinates

Wu Xiugang,Shen Yongming,Zheng Yonghong,Yang Zhifeng

Strategic Study of CAE 2003, Volume 5, Issue 2,   Pages 57-61

Abstract:

Based on depth-averaged mathematic model of flow and pollutant transportation in non-orthogonal curvilinear coordinates, the k-ε double equations´ turbulence model and the coupling arithmetic of velocity-water depth are adopted, which are applied to the numerical simulation of the flow and the contamination diffusion-transportation. The flow field and concentration of discharge both along bank and in the centerline of the meandering channel in laboratory are calculated, and the calculating results accord well with the measured data.

Keywords： curvilinear coordinates     meandering channel     diffusion-transportation     IMPLEC algorithm     concentration field    

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Algebraic-stress Turbulent Model of Planar 2-D Pollutant Convection-Diffusion in Curvilinear Coordinates

Wu Xiuguang,Shen Yongming,Wang Min,Yang Zhifeng

Strategic Study of CAE 2005, Volume 7, Issue 7,   Pages 60-64

Abstract:

The shallow-water equations and pollutant convective-diffusive equation are transformed into curvilinear coordinate system. The anisotropic algebraic-stress turbulent model is introduced to simulate the turbulence items, and algebraic-stress turbulent model of planar 2-D pollutant convection-diffusion in curvilinear coordinates is built. The meandering channel with measured data of concentration in lab is adopted to validate the model. The comparison between the distribution figure of pollutant concentration field calculated through this model and that of the k-ε model shows the model in the paper is superior to k-ε turbulent model in dealing with anisotropy.

Keywords： pollutant     convection-diffusion     anisotropic     algebraic-stress turbulent model     k-ε model    

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HAM: a deep collaborative ranking method incorporating textual information Research Articles

Cheng-wei Wang, Teng-fei Zhou, Chen Chen, Tian-lei Hu, Gang Chen,rr@zju.edu.cn,zhoutengfei@zju.edu.cn,cc33@zju.edu.cn,htl@zju.edu.cn,cg@zju.edu.cn

Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 8,   Pages 1119-1266 doi: 10.1631/FITEE.1900382

Abstract: The recommendation task with a textual corpus aims to model customer preferences from both user feedback and item textual descriptions. It is highly desirable to explore a very deep neural network to capture the complicated nonlinear preferences. However, training a deeper recommender is not as effortless as simply adding layers. A deeper recommender suffers from the gradient vanishing/exploding issue and cannot be easily trained by gradient-based methods. Moreover, textual descriptions probably contain noisy word sequences. Directly extracting feature vectors from them can harm the recommender’s performance. To overcome these difficulties, we propose a new recommendation method named the HighwAy recoMmender (HAM). HAM explores a highway mechanism to make gradient-based training methods stable. A multi-head attention mechanism is devised to automatically denoise textual information. Moreover, a method is devised to train a deep neural recommender. Empirical studies show that the proposed method outperforms state-of-the-art methods significantly in terms of accuracy.

Keywords： 深度学习；推荐系统；高速公路网络；块坐标梯度下降    

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Study on Down Knock-in Renewal Option Pricing

Wu Yun,He Jianmin

Strategic Study of CAE 2004, Volume 6, Issue 12,   Pages 47-50

Abstract:

In this paper, firstly, the basic connotation of modern leasing and the basic principle of real option are dissertated. Then, the down knock-in renewal option pricing model and its solution are put forward. At last, example is provided.

Keywords： leasing     renewal     leasing option     real option     down knock-in option    

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Deep Underground Energy Storage: Aiming for Carbon Neutrality and Its Challenges

Chunhe Yang, Tongtao Wang

Engineering 2023, Volume 29, Issue 10,   Pages 11-14 doi: 10.1016/j.eng.2023.02.010

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Crossing “Environmental Mountain”——On the Increase and Decrease of Environment Impact in the Process of Economic Growth

Lu Zhongwu,Mao Jiansu

Strategic Study of CAE 2003, Volume 5, Issue 12,   Pages 36-42

Abstract:

The curve of environmental impact in the process of economic growth in developed countries was likened to “environmental mountain”. For developing countries, particularly China, the right way of economic development is going through the “environmental mountain” on the halfway up the mountain - a new way for industrialization. The formulas of the relationship between environmental impact and GDP were derived, in which there are 2 key variables： g—growth rate of GDP; t—decreasing rate of environmental impact per unit GDP. Taking several countries and provinces in China as examples, the relationships between economic growth and energy consumption were studied. The environmental impacts of China in the years 2005, 2010 and 2020 were anticipated under different assumptions, and further discussion was given in terms of energy consumption.

Keywords： “environmental mountain”     environmental impact     growth rate of GDP     environmental impact per unit GDP     decreasing rate of environmental impact per unit GDP    

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Global CO2 Emissions Level Off in 2019, with a Drop Predicted in 2020

Sean O’Neill

Engineering 2020, Volume 6, Issue 9,   Pages 958-959 doi: 10.1016/j.eng.2020.07.005

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A Deeper Understanding of the CO2 Emission Pathway under China’s Carbon Emission Peak and Carbon Neutrality Goals

Bofeng Cai,Li Zhang,Yu Lei,Jinnan Wang

Engineering 2023, Volume 30, Issue 11,   Pages 27-29 doi: 10.1016/j.eng.2022.06.014

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Dynamics Modeling of Spacecraft with Composite Flexible Structures

Qu Guangji,Cheng Daosheng

Strategic Study of CAE 1999, Volume 1, Issue 2,   Pages 52-56

Abstract:

It is a conventional method to build dynamic models of flexible spacecraft with hybrid coordinates. This kind of modeling has gotten a great success both in theory and practice to spacecraft with rigid main body and large flexible appendages. However, modern spacecraft are becoming much bigger and more and more complicated. Their developing trend in structure is： 1. Rigid main body is attached by flexible module, to which kinds of large flexible appendages are fixed. This kind of spacecraft is a complicated structure system composed of rigid main body and composite flexible structures; 2. The flexible multi-modules main body, taking on a lower stiffness, and several kinds of large flexible appendages attached to it make the whole spacecraft as an all-flexible structure system.

It is impossible to build the dynamic equations of a spacecraft by its flexible modes, when some of its flexible appendages are not fixed to the rigid main body directly. In order to take full advantage of the achievement of spacecraft dynamics of rigid main body with flexible appendages, this paper makes dynamic models of composite flexible structure spacecraft by hybrid coordinates with taking into consideration the composite transition of linking point between flexible bodies. The corresponding computing software DASFA 2.0 has been used in space engineering design and analysis.

Keywords： spacecraft     composite flexible structure     dynamics of flexible structures     hybrid coordinate method    

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Contemplation on China’s Energy-Development Strategies and Initiatives in the Context of Its Carbon Neutrality Goal

Yinao Su, Houliang Dai, Lichun Kuang, Jizhen Liu, Dazhao Gu, Caineng Zou, Haixia Huang

Engineering 2021, Volume 7, Issue 12,   Pages 1684-1687 doi: 10.1016/j.eng.2021.10.010

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Deformation monitoring on Three Gorges Project ship lift tower during construction period

Qiu Zhangyun,Luo Chen

Strategic Study of CAE 2013, Volume 15, Issue 9,   Pages 102-107

Abstract:

This paper begins with internal and external factors as well as field operating conditions during the monitoring process. According to the accuracy analysis which is done to several typical monitoring methods and the study which is done to the 360° reflecting prism test, the final choice is that total station polar coordinate would be used as the deformation monitoring method of Three Gorges Project ship lift tower during construction period, and deformation analysis is received using the long-term monitoring data obtained by the use of the method. The results show that tower deformation is greatly affected by temperature; the greater the temperature difference, the greater the deformation. It would be small deformation or even no deformation when temperature difference is small or under constant temperature.

Keywords： Three Gorges Project ship lift     tower column     deformation monitoring     total station polar coordinate    

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Geolocation method of HY-2 satellite microwave radiometer

Wu Kuiqiao,Lin Mingsen,Guo Zhenyu

Strategic Study of CAE 2014, Volume 16, Issue 6,   Pages 21-26

Abstract:

Using cone scanning method, microwave radiometer of HY-2 satellite measures the SST and the atmosphere of the earth. This article represents one geolocation method applied to the microwave radiometer of HY-2 satellite according to the geometry model. The image of microwave radiometer was geolocationed with this method, and the result was evaluated at last.

Keywords： HY-2 satellite     geolocation     coordinate system    

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Title Author Date Type Operation

A descent method for the Dubins traveling salesman problem with neighborhoods

Zheng Chen, Chen-hao Sun, Xue-ming Shao, Wen-jie Zhao,z_chen@zju.edu.cn,mecsxm@zju.edu.cn

Journal Article

Block coordinate descent with time perturbation for nonconvex nonsmooth problems in real-world studies

Rui Liu, Wei-chu Sun, Tao Hou, Chun-hong Hu, Lin-bo Qiao,liuruirui@csu.edu.cn,smsysun@foxmail.com,houtao@csu.edu.cn,huchunhong@csu.edu.cn,qiao.linbo@nudt.edu.cn

Journal Article

Fractional-order global optimal backpropagation machine trained by an improved fractional-order steepest descent method

Yi-fei Pu, Jian Wang,puyifei@scu.edu.cn,wangjiannl@upc.edu.cn

Journal Article

Numerical Computation of Flow and Pollutant Diffusion - Transportation With Non-orthogonal Curvilinear Coordinates

Wu Xiugang,Shen Yongming,Zheng Yonghong,Yang Zhifeng

Journal Article

Algebraic-stress Turbulent Model of Planar 2-D Pollutant Convection-Diffusion in Curvilinear Coordinates

Wu Xiuguang,Shen Yongming,Wang Min,Yang Zhifeng

Journal Article

HAM: a deep collaborative ranking method incorporating textual information

Cheng-wei Wang, Teng-fei Zhou, Chen Chen, Tian-lei Hu, Gang Chen,rr@zju.edu.cn,zhoutengfei@zju.edu.cn,cc33@zju.edu.cn,htl@zju.edu.cn,cg@zju.edu.cn

Journal Article

Study on Down Knock-in Renewal Option Pricing

Wu Yun,He Jianmin

Journal Article

Deep Underground Energy Storage: Aiming for Carbon Neutrality and Its Challenges

Chunhe Yang, Tongtao Wang

Journal Article

Crossing “Environmental Mountain”——On the Increase and Decrease of Environment Impact in the Process of Economic Growth

Lu Zhongwu,Mao Jiansu

Journal Article

Global CO2 Emissions Level Off in 2019, with a Drop Predicted in 2020

Sean O’Neill

Journal Article

A Deeper Understanding of the CO2 Emission Pathway under China’s Carbon Emission Peak and Carbon Neutrality Goals

Bofeng Cai,Li Zhang,Yu Lei,Jinnan Wang

Journal Article

Dynamics Modeling of Spacecraft with Composite Flexible Structures

Qu Guangji,Cheng Daosheng

Journal Article

Contemplation on China’s Energy-Development Strategies and Initiatives in the Context of Its Carbon Neutrality Goal

Yinao Su, Houliang Dai, Lichun Kuang, Jizhen Liu, Dazhao Gu, Caineng Zou, Haixia Huang

Journal Article

Deformation monitoring on Three Gorges Project ship lift tower during construction period

Qiu Zhangyun,Luo Chen

Journal Article

Geolocation method of HY-2 satellite microwave radiometer

Wu Kuiqiao,Lin Mingsen,Guo Zhenyu

Journal Article