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Customer Joining Behavior and Regulation Strategy in Visible Multi-Server Queues with Synchronous Vacations of Partial Servers

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Journal of Systems Science & Complexity 2024年第3期37卷 1209-1232页

作者： SUN Wei wang hao XIE Xumeng LI Shiyong School of Economics and Management Yanshan UniversityQinhuangdao 066004China

This paper studies customer joining behavior and system regulation strategy in nonexhaustive visible M/M/m queues with synchronous vacations of a part of the *** this part of the servers are idle,they take multiple vacations simultaneously(vacation period).Until there are customers waiting in the queue,they are reactivated and all servers are busy or idle(busy period).The authors call this part of the servers as“partial servers”.In view of the fully visible queue and the almost visible queue,the authors obtain customers’equilibrium joining threshold strategies and their socially optimal joining threshold strategies,respectively,and observe that customer joining behavior in equilibrium generally makes the system overcrowded,which makes the equilibrium social welfare lower than the optimal social *** regulation,interestingly,for optimizing social welfare,the system manager hopes not only customers arriving in vacation period pay attention to the number of partial servers,but also customers arriving in busy period should care about it rather than ***,arranging more servers for vacation does not necessarily lead to the decrease of social welfare on condition that the number of partial servers is close to *** for the information advantage of the fully visible case,it is not obvious for increasing social welfare and even unfavorable to servers’profit unless the number of partial servers is big ***,given the different composition of social welfare,there exists the optimal number of partial servers and the optimal arrival rate of customers for maximizing social welfare.

关键词： Customer behavior non-exhaustive service partial servers regulation strategy synchronous vacations visible queue

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Towards modeling pedestrian’s invisible trail for simulating crowd movement

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International Journal of Modeling, Simulation, and Scientific Computing 2018年第2期9卷 115-137页

作者： hao wang Muzhou Xiong Office of Laboratory and Equipment Management China University of Geosciences Wuhan 430074 P.R.China School of Computer Science China University of Geosciences Wuhan 430074 P.R.China

Facility layout problem(FLP)contemplates the optimization of space utilization,costs,and material *** simulation softwares are commonly used to validate layouts by simulating the real world material flow and production *** validate a layout scenario of a solar module assembly workshop,a 3D simulation model is presented which was designed on VisualComponents *** begin with,we introduce the layout characteristics and use the systematic layout planning(SLP)method to design the block layout of ***,we built components library which contains all the facilities needed in the production line,specifically conveyors,processing equipments,robots,***,we have established a simulation layout model using the components in the customized library according to the block layout,and configured the components which were allocated in the layout by setting the parameters and building the connection between components via *** improve the performance of the workshop,we have found the best work-in-process(WIP)value for the workshop and the optimal number of ***,the layout model was used to test collision and *** demonstrated the production process in a realistic simulation environment which helped in the sales process as *** reusable component models we have built make it easy to build a layout within a short time and validate the effectiveness of the layout scenarios for any other projects.

关键词： Facility layout problem production line simulation realistic simulation VisualComponents material flow work-in-process.

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Numerical and experimental investigation into the evolution of the shock wave when a muzzle jet impacts a constrained moving body

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Defence Technology（防务技术） 2024年第3期33卷 317-326页

作者： Zijie Li hao wang Changshun Chen Kun Jiang School of Energy and Power Engineering Nanjing University of Science and TechnologyNanjing 210016China

The gun-track launch system is a new special launch device that connects the track outside the *** it is constrained by the track,the characteristics of development of the muzzle jet differ from those of the traditional muzzle ***,it changes from freely developing to doing so in a constrained manner,where this results in an asymmetric direction of flow as well as spatio-temporal coupling-induced interference between various shock waves and the formation of *** this background,the authors of this article formulate and consider the development and characteristics of evolution of the muzzle jet as it impacts a constrained moving *** designed simulations to test the gun-track launch system,and established a numerical model based on the dynamic grid method to explore the development and characteristics of propagation of disturbances when the muzzle jet impacted a constrained moving *** also considered models without a constrained track for the sake of *** results showed that the muzzle jet assumed a circumferential asymmetric shape,and tended to develop in the area above the *** the test platform was close to the ground,the muzzle jet was subjected to reflections from it that enhanced the development and evolution of various forms of shock waves and vortices in the muzzle jet to exacerbate its rate of distortion and asymmetric *** in turn led to significant differences in the changes in pressure at symmetric points that would otherwise have been *** results of a comparative analysis showed that the constrained track could hinder the influence of reflections from the ground on the muzzle jet to some extent,and could reduce the velocity of the shock waves inducing the motion of the muzzle as well as the Mach number of the moving *** work here provides a theoretical basis and the requisite technical support for applications of the gun-track launch *** also sheds light on the

关键词： Shock wave/vortex interference Muzzle jet Constrained boundary Dynamic grid

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An effective array beamforming scheme based on branch-and-bound algorithm

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Journal of Systems Engineering and Electronics 2023年第6期34卷 1483-1489页

作者： YE Xiaodong LI Li wang hao TAO Shifei School of Electronic and Optical Engineering Nanjing University of Science and TechnologyNanjing 210094China

In this paper, we propose an effective full array and sparse array adaptive beamforming scheme that can be applied for multiple desired signals based on the branch-and-bound algorithm. Adaptive beamforming for the multiple desired signals is realized by the improved Capon method. At the same time,the sidelobe constraint is added to reduce the sidelobe level. To reduce the pointing errors of multiple desired signals, the array response phase of the desired signal is firstly optimized by using auxilary variables while keeping the response amplitude unchanged. The whole design is formulated as a convex optimization problem solved by the branch-and-bound algorithm. In addition,the beamformer weight vector is penalized with the modified reweighted l_(1)-norm to achieve sparsity. Theoretical analysis and simulation results show that the proposed algorithm has lower sidelobe level, higher SINR, and less pointing error than the stateof-the-art methods in the case of a single expected signal and multiple desired signals.

关键词： multiple desired signal auxiliary variable branchand-bound algorithm reweighted-norm.

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Facile Preparation of NiO@graphene Nanocomposite with Superior Performances as Anode for Li-ion Batteries

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Acta Metallurgica Sinica(English Letters) 2022年第2期35卷 212-222页

作者： Junke Ou Shugen Wu Lin Yang hao wang Institute for Advanced Study Chengdu UniversityChengdu 610106China Material Corrosion and Protection Key Laboratory of Sichuan Province Sichuan University of Science and EngineeringZigong 643000China Zhanglan Honors College Chengdu UniversityChengdu 610106China School of Medicine Chengdu UniversityChengdu 610106China School of Mechanical Engineering Chengdu UniversityChengdu 610106China

Transition metal oxides gain considerable research attentions as potential anode materials for lithium ion batteries,but their applications are hindered due to their poor electronic conductivity,weak cycle stability and drastic volume ***,a NiO@graphene composite with a unique 3D conductive network structure is prepared through a simple *** applied as anode material for Li-ion batteries,at 50 mA g^(−1),the NiO@graphene displays a high reversible capacity of 1366 mAh g^(−1) and a stable cyclability of 205 mAh g^(−1) after 500 *** at a high rate of 10 A g^(−1),it displays a favorable reversible capacity of 711 mAh g^(−1).Remarkably,when it recovers back to 0.05 A g^(−1),a reversible capacity of 1741 mAh g^(−1) is ***,the NiO@graphene composite with 3D structure shows good application prospects as an alternative anode for advanced lithium ion batteries.

关键词： Lithium ion batteries 3D conductive network structure NiO@graphene composite Alternative

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Combat situation suppression of multiple UAVs based on spatiotemporal cooperative path planning

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Journal of Systems Engineering and Electronics 2023年第5期34卷 1191-1210页

作者： HU Lei YI Guoxing NAN Yi wang hao School of Astronautics Harbin Institute of TechnologyHarbin 150001China

Aiming at the suppression of enemy air defense(SEAD)task under the complex and complicated combat sce-nario,the spatiotemporal cooperative path planning methods are studied in this *** major research contents include opti-mal path points generation,path smoothing and cooperative *** the path points generation part,the path points availability testing algorithm and the path segments availability testing algorithm are designed,on this foundation,the swarm intelligence-based path point generation algorithm is utilized to generate the optimal *** the path smoothing part,taking ter-minal attack angle constraint and maneuverability constraint into consideration,the Dubins curve is introduced to smooth the path *** cooperative rendezvous part,we take esti-mated time of arrival requirement constraint and flight speed range constraint into consideration,the speed control strategy and flight path control strategy are introduced,further,the decoupling scheme of the circling maneuver and detouring maneuver is designed,in this case,the maneuver ways,maneu-ver point,maneuver times,maneuver path and flight speed are ***,the simulation experiments are conducted and the acquired results reveal that the time-space cooperation of multiple unmanned aeriel vehicles(UAVs)is effectively real-ized,in this way,the combat situation suppression against the enemy can be realized in SEAD scenarios.

关键词： heterogeneous unmanned aeriel vehicles(UAVs) situation suppression coope rative rendezvous maneuver strategy multiple constraints

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A Comparative Study of Methods for Delineating Sphere of Urban Influence: A Case Study on Central China

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Chinese Geographical Science 2014年第6期24卷 751-762页

作者： wang hao DENG Yu TIAN Enze wang Kaiyong Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences University of Chinese Academy of Sciences Harvard University Graduate School of Design Cambridge 02138 USA

A number of urban and regional plans have been developed with the advancement of urbanization and regional integration, among which the delineation of sphere of urban influence and improvement of integration between the city and its hinterland have be- come vital important for guiding practices. In terms of delineating sphere of urban influence, existing studies have been focused on static study by using single year data or single method, resulting in a lack of time-series longitudinal analysis or comprehensive analysis based on multiple methods This study emphasizes on comparing two methods from both the theoretical and empirical perspective. Both gravity model and improwd field model are applied to the selected study area for measurements and comparison, to explore their strengths and weaknesses. A research framework for comprehensive analysis on delineating sphere of urban influence is proposed. In the end, the differences of deli：aeating methods are illustrated and the feasibility of comprehensive analysis is discussed. Recommendations are provided for selecting appropriate methods for delineating sphere of urban influence or developing regional hierarchy system plans and urban spatial structure schemes.

关键词： gravity model improved field model sphere of urban influence regional planning central China

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Bioaccumulation and human health risk assessment of trace metals in the freshwater mussel Cristaria plicata in Dongting Lake, China

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Journal of Environmental Sciences 2021年第6期33卷 335-350页

作者： Dianbao Li Baozhu Pan Liang Chen Yuzhu wang Taoyi wang Jun wang hao wang State Key Laboratory of Eco-hydraulic in Northwest Arid Region of China Xi’an University of TechnologyXi’an 710048ShaanxiChina

Trace metal contamination in water and bioaccumulation in aquatic organisms are human health risks of increasing concern. However, the bioaccumulation of trace metals in the organs of the mussel Cristaria plicata in Dongting Lake, China and the human health risks of mussel consumption are largely unknown. We investigated the concentrations of 15 trace metals and metalloids in surface water, sediments, and C. plicata organs(foot, gill, mantle, and visceral mass) and quantified the bioaccumulation and human health risk of these trace metals in specimens collected from Dongting Lake. The concentrations of most metals in surface water exceeded previously published background values. In contrast, the concentrations of most metals in sediments showed a decreasing trend. Overall, the metal concentrations in the gill and visceral masses of C. plicata were higher than those in the foot and mantle, and higher bioaccumulation capacities were observed for essential metals than for nonessential metals. The mean concentrations of the trace elements Zn, Pb, Cd, As, Cu, and Cr in C. plicata foot samples were lower than the threshold values established by international and Chinese organizations. The estimated daily intake(EDI) values of the essential metal Mn in C. plicata foot was higher than the recommended tolerable daily intake(TDI) values for juveniles. Only Mn for juveniles and As for both juveniles and adults may pose noncarcinogenic health risks through foot consumption. The hazard index(HI) values for adults and juveniles were higher than 1, suggesting significant risks of noncarcinogenic effects to humans by exposure to multiple metals.

关键词： Trace metals Bioaccumulation Health risks Cristaria plicata Dongting lake

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Silver vanadate(Ag_(0.33)V_(2)O_(5))nanorods from Ag intercalated vanadium pentoxide for superior cathode of aqueous zinc-ion batteries

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Rare Metals 2022年第8期41卷 2844-2852页

作者： Zhi-hao Su Run-hao wang Jiong-hao Huang Rui Sun Zhao-Xia Qin Yu-Fei Zhang hao-Sen Fan School of Chemistry and Chemical Engineering Guangzhou UniversityGuangzhou510006China School of Chemical Engineering and Light Industry Guangdong University of TechnologyGuangzhou510006China

Silver vanadate(Ag_(0.33)V_(2)O_(5))nanorods were successfully synthesized by the pre-intercalation of Ag+into the interlayer of V_(2)O_(5)through a sol-gel method,which presented a favorable electrochemical performance of high capacity,rate capacity,and cycle *** ally,Ag_(0.33)V_(2)O_(5)electrode presented a high capacity of about 311 mAh·g^(-1)at the current density of0.1 A·g^(-1).It also delivered long-term cycling stability(144 mAh·g^(-1)after 500 cycles at 2 A·g^(-1)).The reasons for the superior electrochemical performance were the preintercalation Ag^+extended interlayer distance,and the introduction of elemental silver improved conductivity during charge/***,the Zn^(2+)storage mechanism was revealed by various characteristic *** prepared Ag_(0.33)V_(2)O_(5)nanorods from the sol-gel method were demonstrated as a promising cathode material for aqueous Zn^(2+)batteries.

关键词： Ag_(0.33)V_(2)O_(5)nanorods Aqueous zinc-ion battery Pre-intercalation Electron and ion transport

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Fabrication and characterization of in situ AlN–TiN/Al composite ribbons

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Rare Metals 2015年第9期34卷 645-649页

作者： Kui wang Chun-Xiang Cui Qian wang Qing-Zhou wang hao wang School of Materials Science and Engineering Hebei University of Technology Key Laboratory for New Type of Functional Materials Hebei University of Technology

The conventional wisdom is that the distribution and sizes of reinforcements, as well as the bonding strength of the matrix–reinforcement interface tend to be the crucial factors in determining the resulting properties of composites: the optimum mechanical properties are likely to be achieved when fine and thermally stable reinforcing particles are homogeneously distributed in a metal *** this study, in situ AlN–TiN/Al composite ribbons were successfully synthesized through plasma jet and subsequent melt-spinning method. The distribution and sizes of the particles in the ribbon were systematically *** average grain sizes of AlN and TiN in the AlN–TiN/Al composite ribbon are determined to be 27.7 and 29.6 nm,respectively. Moreover, analysis by scanning electron microscopy(SEM) results reveal that, compared with the AlN–TiN/Al bulk composite, particles like AlN and TiN could be far more homogeneously distributed in the matrix of the ribbon counterpart. In addition, the reinforcing effect of in situ nanoparticles, including AlN and TiN, was discussed as well.

关键词： Melt-spinning Reinforcing effect Nanoparticles

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