With the evolution of 5th generation(5G)and 6th generation(6G)wireless communication technologies,various Internet of Things(IoT)devices and artificial intelligence applications are proliferating,putting enormous pres...With the evolution of 5th generation(5G)and 6th generation(6G)wireless communication technologies,various Internet of Things(IoT)devices and artificial intelligence applications are proliferating,putting enormous pressure on existing computing power networks.Unmanned aerial vehicle(UAV)-enabled mobile edge computing(U-MEC)shows potential to alleviate this pressure and has been recognized as a new paradigm for responding to data explosion.Nevertheless,the conflict between computing demands and resource-constrained UAVs poses a great challenge.Recently,researchers have proposed resource management solutions in U-MEC for computing tasks with dependency.However,the repeatability among the tasks was ignored.In this paper,considering repeatability and dependency,we propose a U-MEC paradigm based on a computing power pool for processing computationally intensive tasks,in which UAVs can share information and computing resources.To ensure the effectiveness of computing power pool construction,the problem of balancing the energy consumption of UAVs is formulated through joint optimization of an offloading strategy,task scheduling,and resource allocation.To address this NP-hard problem,we adopt a two-stage alternate optimization algorithm based on successive convex approximation(SCA)and an improved genetic algorithm(GA).The simulation results show that the proposed scheme reduces time consumption by 18.41%and energy consumption by 21.68%on average,which can improve the working efficiency of UAVs.展开更多
In this paper a new market based analytical model is proposed for optimal placement of Wind Turbines (WTs) in power systems. In addition to wind turbines, thermal units (THUs) and Pumped Storage Hydro Power Plants (PS...In this paper a new market based analytical model is proposed for optimal placement of Wind Turbines (WTs) in power systems. In addition to wind turbines, thermal units (THUs) and Pumped Storage Hydro Power Plants (PSHPPs) owners participate in power market. Objective function is defined as participants’ social welfare achieved from power pool and ancillary markets in yearly horizon. Wind turbines have been modeled by probability-generation tree scenarios based on statistical information. We concentrate on investment profits of WTs numbers and its generation capacity beside to PSHPPs and THUs power plants in power systems due to increase in high flexible tools for Independent system operator into the planning and operation planning time interval. For effectiveness evaluation of proposed model, simulation studies are applied on 14-Bus IEEE test power system.展开更多
This paper analyses the performance request of arc welding power source used in intelligent control of weld pool shape in pulsed GTAW, and develops a sample power source. The main circuit of the power source takes the...This paper analyses the performance request of arc welding power source used in intelligent control of weld pool shape in pulsed GTAW, and develops a sample power source. The main circuit of the power source takes the structure of single ended inverter with two switches, and takes IGBTs as power switches. The working frequency of the inverter is set at 20 kHz. The control circuit takes PWM circuit as center, and uses single chip computer to complete the manage functions such as the control of working sequence, setting and changing of the welding parameters, sensing of the welding states and communication with outside computer etc. The dynamic reacting time of the whole power is 1 ms, the range of the output current is 5～250 A, the precision of the output current reaches to 1 A. The power strikes arc by contacting workpiece under 5 A, and have convenient interface with system computer. All above shows this power source is one with high performance.展开更多
The effect of frequencies of AC power supply on the quality of the electroslag-melted ingot is studied. The results show that with a decrease in the frequency, electromagnetic force becomes more violent, and the tempe...The effect of frequencies of AC power supply on the quality of the electroslag-melted ingot is studied. The results show that with a decrease in the frequency, electromagnetic force becomes more violent, and the temperature in the slag bath becomes more homogeneous, and therefore, the depth of molten metal pool is decreased; electrochemical reactions occur with the decrease in the frequency, and the atomic oxygen electrolyzed dissolves in the molten metal pool; the nonmetallic inclusions, which are distributed dispersively in the ingot, have an increased content, and their size is approximately in the range of 2--3 μm.展开更多
The passive visual sensing method was successfully applied to monitor the weld pool in TIG welding of aluminium alloy. In order to reduce the disturbance from the arc and acquire clear image, two techniques were used:...The passive visual sensing method was successfully applied to monitor the weld pool in TIG welding of aluminium alloy. In order to reduce the disturbance from the arc and acquire clear image, two techniques were used: one was the own-developed computer-controlled variable polarity power(VPP), the other was the composite filter technology. The VPP source did not have high-frequency electromagnetic interference from arc stabilizer in traditional AC welding power, and its output current wave was controlled by computer, so the imaging current and the imaging time could be adjusted easily. Filter spectral window was identified at 650 nm by analyzing the measured arc light spectral distribution. At the end, the high quality and clear images of welding pool of aluminium alloy were successfully acquired at low imaging current.展开更多
针对当前算力网络安全服务发展中存在的资源池编排调度效率低下、云网安技术融合不足等关键问题,以运营商在安全服务市场面临的云网安协同创新与运营压力为研究背景,提出基于IPv6转发平面的段路由(segment routing over IPv6,SRv6)+应...针对当前算力网络安全服务发展中存在的资源池编排调度效率低下、云网安技术融合不足等关键问题,以运营商在安全服务市场面临的云网安协同创新与运营压力为研究背景,提出基于IPv6转发平面的段路由(segment routing over IPv6,SRv6)+应用响应网络(application responsive network,ARN)的算力网络安全排调度技术策略。该策略通过深度融合SRv6协议实现网络与业务端到端贯通,运用ARN提升数据面标识的简洁性和动态调度能力,构建具备高效编排调度能力的网络数据平面,支持安全业务的灵活组合和快速部署。研究成果主要包含SRv6+ARN编排调度技术架构、关键技术和可靠性保障,为运营商构建云网安协同的算力网络安全资源池提供技术支撑。展开更多
面向5G基站室内基带处理单元(Building Base band Unit,BBU)池化架构下的高密度负载供电需求,提出融合集中式整流、电源远供、人工智能能耗管理与热控优化的电源系统设计方案。构建多维冗余容错结构,集成长短期记忆与注意力机制(Long Sh...面向5G基站室内基带处理单元(Building Base band Unit,BBU)池化架构下的高密度负载供电需求,提出融合集中式整流、电源远供、人工智能能耗管理与热控优化的电源系统设计方案。构建多维冗余容错结构,集成长短期记忆与注意力机制(Long Short-Term Memory with Attention Mechanism,LSTM-Attention)模型预测控制策略与热力仿真协同模型。实验验证表明,系统在电压稳定性、冗余响应、热场均衡等方面具有显著性能优势,满足大规模部署条件。展开更多
基金supported by the Natural Science Foundation of Jiangsu Province,China(No.BK20211227)the National Natural Science Foundation of China(No.62273356)。
文摘With the evolution of 5th generation(5G)and 6th generation(6G)wireless communication technologies,various Internet of Things(IoT)devices and artificial intelligence applications are proliferating,putting enormous pressure on existing computing power networks.Unmanned aerial vehicle(UAV)-enabled mobile edge computing(U-MEC)shows potential to alleviate this pressure and has been recognized as a new paradigm for responding to data explosion.Nevertheless,the conflict between computing demands and resource-constrained UAVs poses a great challenge.Recently,researchers have proposed resource management solutions in U-MEC for computing tasks with dependency.However,the repeatability among the tasks was ignored.In this paper,considering repeatability and dependency,we propose a U-MEC paradigm based on a computing power pool for processing computationally intensive tasks,in which UAVs can share information and computing resources.To ensure the effectiveness of computing power pool construction,the problem of balancing the energy consumption of UAVs is formulated through joint optimization of an offloading strategy,task scheduling,and resource allocation.To address this NP-hard problem,we adopt a two-stage alternate optimization algorithm based on successive convex approximation(SCA)and an improved genetic algorithm(GA).The simulation results show that the proposed scheme reduces time consumption by 18.41%and energy consumption by 21.68%on average,which can improve the working efficiency of UAVs.
文摘In this paper a new market based analytical model is proposed for optimal placement of Wind Turbines (WTs) in power systems. In addition to wind turbines, thermal units (THUs) and Pumped Storage Hydro Power Plants (PSHPPs) owners participate in power market. Objective function is defined as participants’ social welfare achieved from power pool and ancillary markets in yearly horizon. Wind turbines have been modeled by probability-generation tree scenarios based on statistical information. We concentrate on investment profits of WTs numbers and its generation capacity beside to PSHPPs and THUs power plants in power systems due to increase in high flexible tools for Independent system operator into the planning and operation planning time interval. For effectiveness evaluation of proposed model, simulation studies are applied on 14-Bus IEEE test power system.
文摘This paper analyses the performance request of arc welding power source used in intelligent control of weld pool shape in pulsed GTAW, and develops a sample power source. The main circuit of the power source takes the structure of single ended inverter with two switches, and takes IGBTs as power switches. The working frequency of the inverter is set at 20 kHz. The control circuit takes PWM circuit as center, and uses single chip computer to complete the manage functions such as the control of working sequence, setting and changing of the welding parameters, sensing of the welding states and communication with outside computer etc. The dynamic reacting time of the whole power is 1 ms, the range of the output current is 5～250 A, the precision of the output current reaches to 1 A. The power strikes arc by contacting workpiece under 5 A, and have convenient interface with system computer. All above shows this power source is one with high performance.
文摘The effect of frequencies of AC power supply on the quality of the electroslag-melted ingot is studied. The results show that with a decrease in the frequency, electromagnetic force becomes more violent, and the temperature in the slag bath becomes more homogeneous, and therefore, the depth of molten metal pool is decreased; electrochemical reactions occur with the decrease in the frequency, and the atomic oxygen electrolyzed dissolves in the molten metal pool; the nonmetallic inclusions, which are distributed dispersively in the ingot, have an increased content, and their size is approximately in the range of 2--3 μm.
文摘The passive visual sensing method was successfully applied to monitor the weld pool in TIG welding of aluminium alloy. In order to reduce the disturbance from the arc and acquire clear image, two techniques were used: one was the own-developed computer-controlled variable polarity power(VPP), the other was the composite filter technology. The VPP source did not have high-frequency electromagnetic interference from arc stabilizer in traditional AC welding power, and its output current wave was controlled by computer, so the imaging current and the imaging time could be adjusted easily. Filter spectral window was identified at 650 nm by analyzing the measured arc light spectral distribution. At the end, the high quality and clear images of welding pool of aluminium alloy were successfully acquired at low imaging current.
文摘面向5G基站室内基带处理单元(Building Base band Unit,BBU)池化架构下的高密度负载供电需求,提出融合集中式整流、电源远供、人工智能能耗管理与热控优化的电源系统设计方案。构建多维冗余容错结构,集成长短期记忆与注意力机制(Long Short-Term Memory with Attention Mechanism,LSTM-Attention)模型预测控制策略与热力仿真协同模型。实验验证表明,系统在电压稳定性、冗余响应、热场均衡等方面具有显著性能优势,满足大规模部署条件。
