Recently, some new characteristics of complex networks attract the attentions of scientist, in different fields, and lead to many kinds of emerging research directions. So far, most of the researcl work has been limit...Recently, some new characteristics of complex networks attract the attentions of scientist, in different fields, and lead to many kinds of emerging research directions. So far, most of the researcl work has been limited in discovery of complex network characteristics by structure analysis in large-scale software systems. This paper presents the theoretical basis, design method, algorithms and experiment results of the research. It firstly emphasizes the significance of design method of evolution growth for network topology of Object Oriented （OO） software systems, and argues that the selection and modulation of network models with various topology characteristics will bring un-ignorable effect on the process, of design and implementation of OO software systems. Then we analyze the similar discipline of ＂negation of negation and compromise＂ between the evolution of network models with different topology characteristics and the development of software modelling methods. According to the analysis of the growth features of software patterns, we propose an object-oriented software network evolution growth method and its algorithms in succession. In addition, we also propose the parameter systems for OO software system metrics based on complex network theory. Based on these parameter systems, it can analyze the features of various nodes, links and local-world, modulate the network topology and guide the software metrics. All these can be helpful to the detailed design, implementation and performance analysis. Finally, we focus on the application of the evolution algorithms and demonstrate it by a case study. Comparing the results from our early experiments with methodologies in empirical software engineering, we believe that the proposed software engineering design method is a computational software engineering approach based on complex network theory. We argue that this method should be greatly beneficial for the design, implementation, modulation and metrics of functionality, structure and performance in larg展开更多
Under"green architecture"principles,electrochromic smart windows are employed to adjust optical transmittance and indoor temperature,yet their high costs limit the wide application.Here,an electrochromic win...Under"green architecture"principles,electrochromic smart windows are employed to adjust optical transmittance and indoor temperature,yet their high costs limit the wide application.Here,an electrochromic window is driven by a redox flow battery(RFB),where TOC and deposition layers are no longer needed.The transmittance of the electrochromic window is modulated by the state of oxidation(SOC)of aqueous posolyte Fe(phen)_(3)Cl_(2),which is coupled with BTMAP-Vi negolyte in RFB.Under optimized conditions,average CE,VE,and EE reach 93.25%,92.61%,and 86.35%for RFB with a capacity fading rate of 1.57%per cycle.88.66%optical modulation and 9.36 cm^(2)/C coloration efficiency are achieved in the electrochromic process,and 72.34%optical modulation is maintained after 12000 s.Essentially,the indoor temperature declines 3℃for posolyte with 100%SOC when compared with the control experiment using circulating water for a model house.This means minimum electricity of 0.0185 kWh is saved when using an air conditioner to cool a 100 m^(3)house,which corresponds to declined CO_(2)emission(COE)of 0.0185 kg.This work provides a novel and cost-efficient strategy for modulating indoor comfort via electrochromic windows driven by RFB.展开更多
In this article,a single-board integrated millimeter-wave(mm-Wave)asymmetric full-digital beamforming(AFDBF)array is developed for beyond-fifth-generation(B5G)and sixth-generation(6G)communications.The proposed integr...In this article,a single-board integrated millimeter-wave(mm-Wave)asymmetric full-digital beamforming(AFDBF)array is developed for beyond-fifth-generation(B5G)and sixth-generation(6G)communications.The proposed integrated array effectively addresses the challenge of arranging a large number of ports in a full-digital array by designing vertical connections in a three-dimensional space and successfully integrating full-digital transmitting(Tx)and receiving(Rx)arrays independently in a single board.Unlike the traditional symmetric array,the proposed asymmetric array is composed of an 8×8 Tx array arranged in a square shape and an 8+8 Rx array arranged in an L shape.The center-to-center distance between two adjacent elements is 0.54k0 for both the Tx and Rx arrays,where k0 is the free-space wavelength at 27 GHz.The proposed AFDBF array possesses a more compact structure and lower system hardware cost and power consumption compared with conventional brick-type full-digital arrays.In addition,the energy efficiency of the proposed AFDBF array outperforms that of a hybrid beamforming array.The measurement results indicate that the operating frequency band of the proposed array is 24.25–29.50 GHz.An eight-element linear array within the Tx array can achieve a scanning angle ranging from-47°to+47°in both the azimuth and the elevation planes,and the measured scanning range of each eight-element Rx array is–45°to+45°.The measured maximum effective isotropic radiated power(EIRP)of the eight-element Tx array is 43.2 dBm at 28.0 GHz(considering the saturation point).Furthermore,the measured error vector magnitude(EVM)is less than 3%when 64-quadrature amplitude modulation(QAM)waveforms are used.展开更多
转子断条故障难以检测的原因在于工频分量与边频分量在频率上相隔较近且边频信号微弱,这一影响在低转差率时尤为严重。这种情况下,具有高频率分辨率的旋转不变信号参数估计技术(estimation of signal parameters via rotational invaria...转子断条故障难以检测的原因在于工频分量与边频分量在频率上相隔较近且边频信号微弱,这一影响在低转差率时尤为严重。这种情况下,具有高频率分辨率的旋转不变信号参数估计技术(estimation of signal parameters via rotational invariance technique,ESPRIT)的估计效果也失去意义。因此,引入复调制技术,将工频分量搬移至0 Hz并予以滤除。同时,引入hilbert变换构成解析信号,利用其单边频谱性解决负频率分量问题。进而,提出了基于复调制滤波与ESPRIT的异步电动机转子断条故障检测新方法。仿真与实验验证了此方法的有效性。展开更多
基金Supported by the National Natural Science Foundation of China under Grant No.60373086IS0/IEC SC32 Standardization Project No.1.32.22.01.03.00+3 种基金"Tenth Five-Year Plan"National Key Project of Science and Technology under Grant No.2002BA906A21Hubei Province Key Project under Grant No.2004AA103A02Wuhan City Key Project under Grant No.200210020430pen Foundation of SKLSE under Grant No.SKLSE05-19.
文摘Recently, some new characteristics of complex networks attract the attentions of scientist, in different fields, and lead to many kinds of emerging research directions. So far, most of the researcl work has been limited in discovery of complex network characteristics by structure analysis in large-scale software systems. This paper presents the theoretical basis, design method, algorithms and experiment results of the research. It firstly emphasizes the significance of design method of evolution growth for network topology of Object Oriented （OO） software systems, and argues that the selection and modulation of network models with various topology characteristics will bring un-ignorable effect on the process, of design and implementation of OO software systems. Then we analyze the similar discipline of ＂negation of negation and compromise＂ between the evolution of network models with different topology characteristics and the development of software modelling methods. According to the analysis of the growth features of software patterns, we propose an object-oriented software network evolution growth method and its algorithms in succession. In addition, we also propose the parameter systems for OO software system metrics based on complex network theory. Based on these parameter systems, it can analyze the features of various nodes, links and local-world, modulate the network topology and guide the software metrics. All these can be helpful to the detailed design, implementation and performance analysis. Finally, we focus on the application of the evolution algorithms and demonstrate it by a case study. Comparing the results from our early experiments with methodologies in empirical software engineering, we believe that the proposed software engineering design method is a computational software engineering approach based on complex network theory. We argue that this method should be greatly beneficial for the design, implementation, modulation and metrics of functionality, structure and performance in larg
基金supports from the National Natural Science Foundation of China(No.22122108)the Luohe Xinwang Chemical Co.,Ltd.,China.The“Top-rated Discipline”construction scheme of Shaanxi higher education in China supported part of this work。
文摘Under"green architecture"principles,electrochromic smart windows are employed to adjust optical transmittance and indoor temperature,yet their high costs limit the wide application.Here,an electrochromic window is driven by a redox flow battery(RFB),where TOC and deposition layers are no longer needed.The transmittance of the electrochromic window is modulated by the state of oxidation(SOC)of aqueous posolyte Fe(phen)_(3)Cl_(2),which is coupled with BTMAP-Vi negolyte in RFB.Under optimized conditions,average CE,VE,and EE reach 93.25%,92.61%,and 86.35%for RFB with a capacity fading rate of 1.57%per cycle.88.66%optical modulation and 9.36 cm^(2)/C coloration efficiency are achieved in the electrochromic process,and 72.34%optical modulation is maintained after 12000 s.Essentially,the indoor temperature declines 3℃for posolyte with 100%SOC when compared with the control experiment using circulating water for a model house.This means minimum electricity of 0.0185 kWh is saved when using an air conditioner to cool a 100 m^(3)house,which corresponds to declined CO_(2)emission(COE)of 0.0185 kg.This work provides a novel and cost-efficient strategy for modulating indoor comfort via electrochromic windows driven by RFB.
基金supported by the National Key Research and Development Program of China(2020YFB1804900 and 2022YFE0210900)the Fundamental Research Funds for the Central Universities(2242022k60008 and 2242022k30003)+2 种基金the National Natural Science Foundation of China(62301152 and 61627801)the Youth Talent Promotion Foundation of Jiangsu Science and Technology Association(TJ-2023-074)the Startup Research Fund of Southeast University(RF1028623286).
文摘In this article,a single-board integrated millimeter-wave(mm-Wave)asymmetric full-digital beamforming(AFDBF)array is developed for beyond-fifth-generation(B5G)and sixth-generation(6G)communications.The proposed integrated array effectively addresses the challenge of arranging a large number of ports in a full-digital array by designing vertical connections in a three-dimensional space and successfully integrating full-digital transmitting(Tx)and receiving(Rx)arrays independently in a single board.Unlike the traditional symmetric array,the proposed asymmetric array is composed of an 8×8 Tx array arranged in a square shape and an 8+8 Rx array arranged in an L shape.The center-to-center distance between two adjacent elements is 0.54k0 for both the Tx and Rx arrays,where k0 is the free-space wavelength at 27 GHz.The proposed AFDBF array possesses a more compact structure and lower system hardware cost and power consumption compared with conventional brick-type full-digital arrays.In addition,the energy efficiency of the proposed AFDBF array outperforms that of a hybrid beamforming array.The measurement results indicate that the operating frequency band of the proposed array is 24.25–29.50 GHz.An eight-element linear array within the Tx array can achieve a scanning angle ranging from-47°to+47°in both the azimuth and the elevation planes,and the measured scanning range of each eight-element Rx array is–45°to+45°.The measured maximum effective isotropic radiated power(EIRP)of the eight-element Tx array is 43.2 dBm at 28.0 GHz(considering the saturation point).Furthermore,the measured error vector magnitude(EVM)is less than 3%when 64-quadrature amplitude modulation(QAM)waveforms are used.
文摘转子断条故障难以检测的原因在于工频分量与边频分量在频率上相隔较近且边频信号微弱,这一影响在低转差率时尤为严重。这种情况下,具有高频率分辨率的旋转不变信号参数估计技术(estimation of signal parameters via rotational invariance technique,ESPRIT)的估计效果也失去意义。因此,引入复调制技术,将工频分量搬移至0 Hz并予以滤除。同时,引入hilbert变换构成解析信号,利用其单边频谱性解决负频率分量问题。进而,提出了基于复调制滤波与ESPRIT的异步电动机转子断条故障检测新方法。仿真与实验验证了此方法的有效性。
