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Computational intelligence interception guidance law using online off-policy integral reinforcement learning

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Journal of Systems Engineering and Electronics 2024年第4期35卷 1042-1052页

作者： wang qi LIAO Zhizhong China Airborne Missile Academy Luoyang 471009China

Missile interception problem can be regarded as a two-person zero-sum differential games problem,which depends on the solution of Hamilton-Jacobi-Isaacs(HJI)*** has been proved impossible to obtain a closed-form solu-tion due to the nonlinearity of HJI equation,and many iterative algorithms are proposed to solve the HJI ***-ous policy updating algorithm(SPUA)is an effective algorithm for solving HJI equation,but it is an on-policy integral reinforce-ment learning(IRL).For online implementation of SPUA,the dis-turbance signals need to be adjustable,which is *** this paper,an off-policy IRL algorithm based on SPUA is pro-posed without making use of any knowledge of the systems ***,a neural-network based online adaptive critic implementation scheme of the off-policy IRL algorithm is *** on the online off-policy IRL method,a computa-tional intelligence interception guidance(CIIG)law is developed for intercepting high-maneuvering *** a model-free method,intercepting targets can be achieved through measur-ing system data *** effectiveness of the CIIG is verified through two missile and target engagement scenarios.

关键词： two-person zero-sum differential games Hamilton–Jacobi–Isaacs(HJI)equation off-policy integral reinforcement learning(IRL) online learning computational intelligence inter-ception guidance(CIIG)law

Effect of Cu content on the glass forming ability of Cu-Zr-Ti system studied by ion beam mixing

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Science China(Technological Sciences) 2015年第4期58卷 750-752页

作者： wang Yuan Yu wang qi LIU Bai Xin Key Laboratory of Advanced Materials (MOE) School of Materials Science and Engineering Tsinghua University

Based on the Cu-Zr-Ti ternary phase diagram,four sets of Cu-Zr-Ti multilayered films with various compositions of Cu20Zr36Ti44,Cu36Zr31Ti33,Cu49Zr24Ti27,and Cu67Zr16Ti17 were prepared and then the ion beam mixing was carried *** turned out that the increase of Cu content doesn't always have a positive effect on the glass forming *** glass forming ability of Cu49Zr24Ti27 was degraded due to the appearance of a Cs Cl-type B2 structure Cu Zr phase in the eutectic *** experimental observations justify the existence of the Cu Zr phase under the non-equilibrium *** formation mechanisms for the crystalline phase were also discussed in terms of the atomic collision theory.

关键词： glass forming ability ion beam mixing films

Lysine Acetylation and Deacetylation in Brain Development and Neuropathies

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Genomics, Proteomics & Bioinformatics 2017年第1期15卷 19-36页

作者： Alicia Tapias Zhao-qi wang Leihniz Institute on Aging Fritz Lipmann Institute(FLI) 07745 JenaGermany Faculty of Biology and Pharmacy Friedrich Schiller University of Jena07743 JenaGermany

Embryonic development is critical for the final functionality and maintenance of the adult brain. Brain development is tightly regulated by intracellular and extracellular signaling. Lysine acetylation and deacetylation are posttranslational modifications that are able to link extracellular signals to intracelhdar responses. A wealth of evidence indicates that lysine acetylation and deacetylation are critical for brain development and functionality. Indeed, mutations of the enzymes and cofactors responsible for these processes are often associated with neurodevelopmental and psychiatric disorders. Lysine acetylation and deacetylation are involved in all levels of brain development, starting from neuroprogenitor survival and proliferation, cell fate decisions, neuronal maturation, migration, and synaptogenesis, as well as differentiation and maturation of astrocytes and oligodendrocytes, to the establishment of neuronal circuits. Hence, fluctuations in the balance between lysine acetylation and deacetylation contribute to the final shape and perrformance of the brain. In this review, we summarize the current basic knowledge on the specific roles of lysine acetyltransferase （KAT） and lysine deacetylase （KDAC） complexes in brain development and the different neurodevelopmental disorders that are associated with dysfunctional lysine （de）acetylation machineries.

关键词： KAT KDAC:Neural stem cells/neuroprogenitors Neurogenesis Neurodevelopmentaldisorders

Oscillation of Numerical Solution in the Runge-Kutta Methods for Equation x'(t)=ax(t)+a_0x([t])

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Acta Mathematicae Applicatae Sinica 2014年第4期30卷 943-950页

作者： qi wang Shen-shan qiU School of Apllied Mathematics Guangdong University of Technology CSIB Software Technology Center The Administrative Commission of Guangzhou Tianhe Software Park

The paper de ls with oscillation of Runge-Kutta methods for equation x＇（t） = ax（t）＋ aox（[t]）. The conditions of oscillation for the numerical methods are presented by considering the characteristic equation of the corresponding discrete scheme. It is proved that any nodes have the same oscillatory property as the integer nodes. Furthermore, the conditions under which the oscillation of the analytic solution is inherited by the numerical solution are obtained. The relationships between stability and oscillation are considered. Finally, some numerical experiments are given.

关键词： piecewise continuous arguments Runge-Kutta methods stablity oscillation

Individualized medicine,health medicine,and constitutional theory in Chinese medicine

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Frontiers of Medicine 2012年第1期6卷 1-7页

作者： qi wang Center for Studies in Constitution Research of Traditional Chinese Medicine School of Basic MedicineBeijing University of Chinese MedicineBeijing 100029China

The patterns of modern science and changes in the medical model can result in the transformation of the current state of individualized and health medicines into being the primary trend in medical *** and Western medical systems are dissimilar in terms of value orientations,thinking style,and research directions because of their different historical and cultural *** treatment in modern medicine is mainly established based on individual genome information and the differences in mononucleotide ***,such treatment method is expensive,creates an uncertain genetic marker,and leads to different result interpretations,among other *** Chinese constitutional theory developed in the 1970s expresses the principle behind Chinese health medicine and individual treatment and provides the corresponding *** Chinese constitutional theory divides the constitution of the Chinese population into nine categories based on established classification *** promotes the study of the relationship of each constitution to diseases and Chinese medicine preparation toward adjusting the constitution and preventing *** theory also provides methods and tools for individualized *** identification shows the direction and provides the core technology for the evaluation of the health *** combining the developments in modern biotechnology,new diagnostic techniques and treatment models of constitution-differentiation,disease-differentiation,and syndrome-differentiation can be established for the development of individualized Chinese medicine treatment and health medicine for the international medical community.

关键词： individualized medicine health medicine constitutional theory in Chinese medicine

A High-Resolution Modeling Study of the 19 June 2002 Convective Initiation Case during IHOP 2002:Localized Forcing by Horizontal Convective Rolls

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Advances in Atmospheric Sciences 2018年第10期35卷 1243-1253页

作者： qi-Wei wang Ming XUE Key Laboratory of Mesoscale Severe Weather and School of Atmospheric Sciences Nanjing University Nanjing 210023China Center for Analysis and Prediction of Storms and School of Meteorology University of Oklahoma Norman Oklahoma 73072USA

The initiation processes of one of the initial convective cells near and on the east side of a dryline on 19 June 2002 during the IHOP 2002 field experiment in the central United States is analyzed in detail based on a high-resolution numerical simulation. Prominent horizontal convective rolls and associated near-surface moisture convergence bands [called roll convergence bands(RCBs) here] develop within the convective boundary layer(CBL) due to surface heating, in the hours leading to convective initiation(CI). The RCBs east of the dryline are advected toward the primary dryline convergence boundary(PDCB) by the southerly moist flow as the CBL deepens with time. Backward trajectories of air parcels forming the initial precipitating updraft of the convective cell are found to primarily originate at about 1–1.5 km above ground, within the upper portion of the shallower CBL earlier on. The representative air parcel is found to follow and stay on top of a surface RCB as the RCB moves toward the PDCB, but the RCB forcing alone is not enough to initiate convection. As this RCB gets close to the PDCB, it moves into a zone of mesoscale convergence and a deeper CBL that exhibits an upward moisture bulge associated with the PDCB. The combined upward forcing of the RCB and the mesoscale PDCB convergence quickly lifts the representative air parcel above its level of free convection to initiate convection. A conceptual model summarizing the CI processes is proposed.

关键词： convective initiation dryline localized forcing horizontal convective rolls

Passive Control of Flow-Induced Vibration(FIV)by Helical Strakes for Two Staggered Flexible Cylinders

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China Ocean Engineering 2021年第4期35卷 475-489页

作者： XU Wan-hai wang qi-cheng qiN Wen-qi DU Zun-feng State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China School of Civil Engineering Tianjin UniversityTianjin 300072China CIMC Offshore Co.Ltd Shenzhen 518000China

Helical strake is a widely-used device for passive flow-induced vibration(FIV)control of cylindrical *** is omnidirectional and can effectively reduce FIV response *** on the passive FIV control for cylindrical structures are mainly concerned with a single isolated cylinder,while the influence of wake interference between multiple cylinders on FIV suppression devices is less considered up to *** engineering applications,multiple flexible cylinders with large aspect ratios can be subjected to complex flow forces,and the effects of wake interference are *** FIV suppression effect of helical strake of a common configuration(17.5D pitch and 0.25D height,where D is the cylinder diameter)in two staggered cylinders system is still *** paper systematically studied the FIV response of multiple cylinders system fitted with the helical strakes by model *** relative spatial position of the two cylinders is fixed at S=3.0D and T=8.0D,which ensures the cylindrical structures in the flow interference *** experimental results show that the helical strakes effectively reduce the FIV response on staggered upstream cylinder,and the suppression efficiency is barely affected by the smooth or straked downstream *** corresponding FIV suppression efficiency on the downstream cylinder is remarkably reduced by the influence of the upstream wake *** wake-induced vibration(WIV)phenomenon is not observed on the staggered downstream cylinder,which normally occurs on the downstream straked cylinder in a tandem arrangement.

关键词： flow-induced vibration(FIV) passive control helical strakes flexible cylinders staggered arrangement

Thermodynamically consistent model for diblock copolymer melts coupled with an electric field

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Chinese Physics B 2022年第4期31卷 710-714页

作者： Xiaowen Shen qi wang School of Physical and Mathematical Sciences Nanjing Tech UniversityNanjing 211816China Beijing Computational Science Research Center Beijing 100193China Department of Mathematics University of South CarolinaColumbiaSC 29208USA

We present a thermodynamically consistent model for diblock copolymer melts coupled with an electric field derived using the Onsager linear response *** compare the model with the thermodynamically inconsistent one pr... 详细信息

关键词： thermodynamical consistency diblock copolymer melts electric field phase field model

Dynamic mechanical behavior of a Zr-based bulk metallic glass during glass transition and crystallization

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Rare Metals 2009年第1期28卷 72-76页

作者： CHAO qi wang qing DONG Yuanda Institute of Materials Science Shanghai University Shanghai 200072 China

The dynamic mechanical behaviors of the Zr41Ti14Cu12.5Ni8Be22.5Fe2 bulk metallic glass （BMG） during continuous heating at a constant rate were investigated. The glass transition and crystallization of the Zr-based BMG were thus characterized by the measurements of storage modulus E′ and internal friction Q^-1. It was found that the variations of these dynamic mechanical quantities with temperature were interre-lated and were well in agreement with the DSC trace obtained at the same heating rate. The origin of the first peak in the internal friction curve was closely related to the dynamic glass transition and subsequent primary crystallization. Moreover, it can be well described by a physical model, which can characterize atomic mobility and mechanical response of disordered condense materials. In comparison with the DSC trace, the relative position of the first internal friction peak of the BMG was found to be dependent on its thermal stability against crys-tallization.

关键词： metallic glass dynamic mechanical behavior internal friction glass transition crystallization