A novel disturbance decoupled filter (DDF) design scheme is presented. Firstly, the system with unknown input is translated into an equivalent system without unknown imputs by a simple algebraic transformation. Then, ...A novel disturbance decoupled filter (DDF) design scheme is presented. Firstly, the system with unknown input is translated into an equivalent system without unknown imputs by a simple algebraic transformation. Then, a new DDF design scheme, which is very simple, is proposed via innovations theorem. At last, the application of DDF to Maneuvering Targets Tracking is simulated and the simulation results show that DDF is suitable for high maneuvering cases.展开更多
为了针对目前具有较强隐蔽性的多向量应用层DDo S(Distributed denial of service)攻击方式,对应用层攻击的模型深入分析,提出了应用层发生的Do S(Denial of Service)攻击防御模型。通过构建并弹性获得吸收攻击所需的带宽容量和过滤攻...为了针对目前具有较强隐蔽性的多向量应用层DDo S(Distributed denial of service)攻击方式,对应用层攻击的模型深入分析,提出了应用层发生的Do S(Denial of Service)攻击防御模型。通过构建并弹性获得吸收攻击所需的带宽容量和过滤攻击流量的网络架构以及基于云计算的虚拟防火墙安全策略,减少数据中心受到DDo S攻击的可能性。使用该攻击防御模型能够更好提高数据中心对应用层DDo S攻击的防御能力,改善网络环境。经过验证该模型能够显著提升网络系统的安全性能。展开更多
This paper introduces a technique for searching for bright massive stars in galaxies beyond the Local Group.To search for massive stars,we processed the results of stellar photometry from the Hubble Space Telescope(HS...This paper introduces a technique for searching for bright massive stars in galaxies beyond the Local Group.To search for massive stars,we processed the results of stellar photometry from the Hubble Space Telescope(HST)images using the DAOPHOT and DOLPHOT packages.The results of such searches are demonstrated with examples of the galaxies DDO 68,M94 and NGC 1672.In the galaxy DDO 68,the LBV star changes its brightness,and massive stars in M94 can be identified by excess in the Ha band.For the galaxy NGC 1672,we measure the distance for the first time by the TRGB method,which enabled determining the luminosities of the brightest stars,likely hypergiants,in the young star formation region.So far,we have performed stellar photometry on HST images of 320 northern sky galaxies located at a distance less than 12 Mpc.This allowed us to identify 53 galaxies with probable hypergiants.Further photometric and spectral observations of these galaxies are planned to search for massive stars.展开更多
文摘A novel disturbance decoupled filter (DDF) design scheme is presented. Firstly, the system with unknown input is translated into an equivalent system without unknown imputs by a simple algebraic transformation. Then, a new DDF design scheme, which is very simple, is proposed via innovations theorem. At last, the application of DDF to Maneuvering Targets Tracking is simulated and the simulation results show that DDF is suitable for high maneuvering cases.
文摘为了针对目前具有较强隐蔽性的多向量应用层DDo S(Distributed denial of service)攻击方式,对应用层攻击的模型深入分析,提出了应用层发生的Do S(Denial of Service)攻击防御模型。通过构建并弹性获得吸收攻击所需的带宽容量和过滤攻击流量的网络架构以及基于云计算的虚拟防火墙安全策略,减少数据中心受到DDo S攻击的可能性。使用该攻击防御模型能够更好提高数据中心对应用层DDo S攻击的防御能力,改善网络环境。经过验证该模型能够显著提升网络系统的安全性能。
基金financially supported by the Russian Foundation for Basic Researchthe National Science Foundation of Bulgaria as a part of the scientific project N 19–52–18007,Grant KP–06–Russia–9/2019。
文摘This paper introduces a technique for searching for bright massive stars in galaxies beyond the Local Group.To search for massive stars,we processed the results of stellar photometry from the Hubble Space Telescope(HST)images using the DAOPHOT and DOLPHOT packages.The results of such searches are demonstrated with examples of the galaxies DDO 68,M94 and NGC 1672.In the galaxy DDO 68,the LBV star changes its brightness,and massive stars in M94 can be identified by excess in the Ha band.For the galaxy NGC 1672,we measure the distance for the first time by the TRGB method,which enabled determining the luminosities of the brightest stars,likely hypergiants,in the young star formation region.So far,we have performed stellar photometry on HST images of 320 northern sky galaxies located at a distance less than 12 Mpc.This allowed us to identify 53 galaxies with probable hypergiants.Further photometric and spectral observations of these galaxies are planned to search for massive stars.
