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Physical impairments awareness based virtual network mapping strategy of elastic optical networks

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Optoelectronics Letters 2021年第1期17卷 36-39页

作者： HUO Chao LIU Lin BAI Hui-feng Beijing SmartChip Microelectronics Technology company limited Beijing 102200China State grid Dalian Electric Power Supply company Dalian 116011China

As virtual networks services emerge increasingly with higher requirement of flexibility and robust, great complex challenges caused by physical-layer impairments are presented to the elastic optical networks(EON). Aimed to solve this problem, this paper proposes a physical impairment awareness based virtual network mapping stragegy of EON. The physical impairments awareness model is established, including both of linear factors and nonlinear ones. On this basis, this paper proposes a virtual network mapping strategy with detailed procedures, combined with node importance factors during the virtual network mapping procedure. Test results show that the proposed approach is able to reduce blocking rate and enhance services supporting ability of EON.

关键词： network optical networks

Simplified Echo-State-Network Based Services Awareness for High-Speed Passive Optical Network

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china Communications 2017年第6期14卷 13-21页

作者： Huifeng Bai Dongshan Wang Yanbin Song Beijing SmartChip Microelectronics company limited Beijing 102200 China

With the challenge from services diversity grows greatly,the service-oriented supporting ability is required to current high-speed passive optical network(PON) .Aimed to enhance the quality of service(Qo S) brought by diversified-services,this paper proposes an Simplified Echo State Network(SESN) Based Services Awareness scheme in High-Speed PON(Passive Optical Network) .In this proposed scheme,the ring topology is adopted in the reservoir of SESN to reduce the complexity of original Echo State Network,and system dynamics equation is introduced to keep the accuracy of *** to the network architecture of 10G-EPON,a SESN Master is running in the OLT and a number of SESN Agents work in *** SESN Master plays the main function of service-awareness from the total view of various kinds services in 10G-EPON system,by fully SESN ***,the reservoir information of well-trained SESN in OLT will be broadcasted to all ONUs and those SESN Agents working in ONUs are allowed to conducts independent service-awareness ***,resources allocation and transport policy are both determined just only in *** results show that the proposed mechanism is able to better supporting ability for multiple services.

关键词： passive optical network servicesawareness simplified echo state network reservoir computation

Numerical Study of Heat Transfer Enhancement in the Electric Vehicle Battery via Vortex‑Induced Agitator

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Automotive Innovation 2023年第2期6卷 244-255页

作者： Yubo Lian Yinsheng Liao Jianjian Liu Zhiming Hu Haolun Xu BYD Auto Industry company limited 518118 ShenzhenChina

Convective heat transfer plays an important role in the development of a high-performance battery *** vehicles carry a large amount of the battery cells to reach a longer range of endurance *** diffusion around the battery cells can be considered as obstacles to improve the convective heat transfer *** this paper,a novel agitator taking advantage of strong vortices is designed to disrupt the thermal boundary layer around the battery cells,thereby improving the fluid mixing for enhanced convective heat transfer.A fluid–structure interaction algorithm is developed to simulate the convective heat transfer rate at various flapping *** the comparison with clean channel,the vortex-induced vibra-tion by the agitated beam can increase the average Nusselt number by 119.59%.This research can be applied to optimize the thermal-structure design inside the electric vehicle battery.

关键词： Electric vehicle battery Thermal management Fluid–structure interaction Air cooling

Load Shedding and Restoration for Intentional Island with Renewable Distributed Generation

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Journal of Modern Power Systems and Clean Energy 2021年第3期9卷 612-624页

作者： Jian Xu Boyu Xie Siyang Liao Zhiyong Yuan Deping Ke Yuanzhang Sun Xiong Li Xiaotao Peng the School of Electrical Engineering and Automations Wuhan UniversityWuhan 430072China the china Southern Power grid Research Institute China Southern Power Grid CompanyGuangzhou 510663China

Due to the high penetration of renewable distributed generation(RDG),many issues have become conspicuous during the intentional island operation such as the power mismatch of load shedding during the transition process and the power imbalance during the restoration *** this paper,a phase measurement unit(PMU)based online load shedding strategy and a conservation voltage reduction(CVR)based multi-period restoration strategy are proposed for the intentional island with *** proposed load shedding strategy,which is driven by the blackout event,consists of the load shedding optimization and correction *** the occurrence of the large-scale blackout,the load shedding optimization is solved periodically to obtain the optimal load shedding plan,which meets the dynamic and steady *** the blackout occurs,the correction table updated in real time based on the PMU data is used to modify the load shedding plan to eliminate the power mismatch caused by the fluctuation of *** the system transits to the intentional island seamlessly,multi-period restoration plans are generated to optimize the restoration performance while maintaining power balance until the main grid is ***,CVR technology is implemented to restore more loads by regulating load *** proposed load shedding optimization and restoration optimization are linearized to mixed-integer quadratic constraint programming(MIQCP)*** effectiveness of the proposed strategies is verified with the modified IEEE 33-node system on the real-time digital simulation(RTDS)platform.

关键词： Intentional island renewable distributed generation(RDG) load shedding restoration phase measurement unit(PMU) conservation voltage reduction(CVR)

Application of axiomatic approach to coal mine design field

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Journal of Coal Science & Engineering(china) 2004年第2期10卷 95-100页

作者：国汉军 china Shenhua Energy company limited Beijing 100011 China

Two design axioms and axiomatic approach were discussed. As an example of application, design process of a new style single prop was illustrated in term of axi- oms.

关键词： coal mine design field axiomatic single prop

Intelligent power distribution live‐line operation robot systems based on stereo camera

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High Voltage 2023年第6期8卷 1306-1318页

作者： Yutao Chen Yahao Wang Xuming Tang Kai Wu Shaolei Wu Rui Guo Yu Feng Erbao Dong Department of Precision Machinery and Precision Instrumentation University of Science and Technology of ChinaHefeiChina State grid Anhui Electric Power company HefeiChina State grid Anhui Electric Power company Electric Power Research Institute HefeiChina State grid Intelligent Technology Co. LtdJinanChina

Maintenance tasks in distribution networks are often accompanied by hazards associated with high altitudes and high *** utilising robots instead of human operators to perform these tasks,potential risks can be avoided,while productivity can be *** research proposes an intelligent power distribution live‐line operation robot(PDLOR)system based on a stereo camera to replace human to complete *** PDLOR system consists of several key components,including dual manipulators,wireless tools,a visual perception system,an insulated bucket truck,and a ground control *** the task is confirmed,the real‐time vision system identification and posi-tioning enable the adjustment of the insulated bucket to position the robot correctly for its intended *** stereo camera plays a crucial role in accurately recognising and estimating the object's ***,a simplified reconstruction is performed within a virtual simulation environment,which aids in collision detection during path *** obtaining the optimal path,it is then communicated to the real manip-ulator for *** validate the feasibility of the PDLOR system,field experiments were conducted in actual distribution network *** results demonstrate that the PDLOR effectively completes single‐phase power‐line connection tasks within a remarkable 10‐min timeframe.

关键词： robot distribution stereo

Logformer: Cascaded Transformer for System Log Anomaly Detection

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Computer Modeling in Engineering & Sciences 2023年第7期136卷 517-529页

作者： Feilu Hang Wei Guo Hexiong Chen Linjiang Xie Chenghao Zhou Yao Liu Information Center Yunnan Power Grid Company LimitedKunming650034China Network andData Security Key Laboratory of Sichuan Province University of Electronic Science and Technology of ChinaChengdu610054China

Modern large-scale enterprise systems produce large volumes of logs that record detailed system runtime status and key events at key *** logs are valuable for analyzing performance issues and understanding the status of the *** detection plays an important role in service management and system maintenance,and guarantees the reliability and security of online *** are universal semi-structured data,which causes difficulties for traditional manual detection and pattern-matching *** some deep learning algorithms utilize neural networks to detect anomalies,these approaches have an over-reliance on manually designed features,resulting in the effectiveness of anomaly detection depending on the quality of the *** the same time,the aforementioned methods ignore the underlying contextual information present in adjacent log *** propose a novel model called Logformer with two cascaded transformer-based heads to capture latent contextual information from adjacent log entries,and leverage pre-trained embeddings based on logs to improve the representation of the embedding *** proposed model achieves comparable results on HDFS and BGL datasets in terms of metric accuracy,recall and ***,the consistent rise in F1-score proves that the representation of the embedding spacewith pre-trained embeddings is closer to the semantic information of the log.

关键词： Anomaly detection system logs semi-structured data pre-trained embedding cascaded transformer

Thickness-Dependent Microstructure and its Effect on Anisotropic Mechanical Properties of Duplex Stainless Steel 2205 Multi-pass Welded Joints

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Acta Metallurgica Sinica(English Letters) 2023年第11期36卷 1883-1892页

作者： Zhilong Dong Xue-Fang Xie Jingwen Li Yu Wan State Key Laboratory of Heavy Oil Processing College of New EnergyChina University of Petroleum(East China)Qingdao266580China china National Offshore Oil Corporation Petrochemical Engineering company limited Jinan250000China

In this study,the thickness-dependent microstructural characteristics of duplex stainless steel 2205 multi-pass welded joints were first investigated by the combination of optical microscope and electron back-scattered diffraction ***,a series of tensile tests of miniature samples cut from different passes and directions were performed to analyze the thickness-dependent and anisotropic mechanical *** results demonstrate that the microstructure changed with the welded passes,i.e.,a large number of grain boundary austenite,Widmanstätten austenite and a small number of tiny intragranular austenite existed at the surface passes,while a mass of intragranular austenite were found at the middle ***,the Kurdjumov–Sachs orientation relationship was widespread at the welded *** addition,the yield and tensile strengths of the middle passes were greater than that of the surface passes due to the grain-boundary strengthening by tiny intragranular ***,due to the existence of Kurdjumov–Sachs orientation relationship,the longitudinal yield and tensile strength were greater than transverse values,particularly for the middle passes.

关键词： Duplex stainless steel Multi-pass welded joints Thickness-dependent microstructure Anisotropic mechanical properties

Mountain Effect and Differences in Storm Floods between Northern and Southern Sources of the Songhua River Basin

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Journal of Mountain Science 2012年第3期9卷 431-440页

作者： LI Hongyan WU Ya'nan LI Xiubin Key Laboratory of Groundwater Resources and Environment Ministry of Education Jilin University Changchun 130021 China Baishan Power Plant of State grid Xin Yuan company limited Huadian 132400 China

In this study, the differences in annual rainstorm changes in the Second Songhua River Basin and the Nenjiang River basin and their causes were compared from the perspective of mountain effects. The following results were drawn: (1) Altitude effect is the primary factor leading to increased rainstorms in the southern source; (2) Slope effect primarily leads to differences of the weather systems in the two sources, and thus cause the difference of the rainstorms; (3) Slope effect is responsible for the greater fluctuation in the observed floods in the southern source. These landform differences eventually lead to the differences in the characteristics of floods in the southern and northern sources. Commensurability method was used to identify the period of rainstorms in the southern and northern sources. The results showed that although rainstorms do not appear at the same time in the two sources they are characteristic of a 10 years' period in both areas. These results can serve as hydrological references for flood control and long-term flood disaster predictions.

关键词： Mountain effect Songhua River Basin Nenjiang River Basin the Second Songhua RiverBasin Storm flood