Yanmei Lv

Shaanxi University of Chinese Medicine

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Co-Authors

Wang Gefang

Ordnance Engineering College

Ning Han

Zhejiang A & F University

Jiangsheng Sun

Beijing Machine Tool Research Institute

Sujian Li

Peking University

Xu AiHua

Wuhan College

Hongtao Zhen

Tongji Hospital

Mingfei Xia

Guizhou Normal University

Dong Zhang

Beijing University of Chemical Technology

Guihe Tang

South China Agricultural University

Yang Yu

Harbin Institute of Technology

Cooperative Institutions

Beijing Machine Tool Research Institute

Ordnance Engineering College

Chinese Academy of Sciences

Harbin Institute of Technology

Shijiazhuang University

Tongji University

University of Science and Technology of China

Hunan Normal University

University of Science and Technology Beijing

Zhengzhou University

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Research on Equipment Spare Parts Quasi-Three-Stage Inventory Model of Three-Echelon Assembly Relationship

Jiangsheng Sun Wanling Li Yanmei Lv Lianwu Zhang

The quasi-three-stage inventory model based on Three-echelon Assembly relationship was established relying on background of repairing and accommodating for PLA's weapon equipment valuable spare parts in the paper, borrowing ideas from research production of foreign repairable spare parts inventory theory and researching on classical VARI-METRIC model and its theory. By discussing parameters of spare parts that includes cost, average pipelines, inventory level and backorder, the model could gained optimization inventory strategy for spare parts under different assembly relationship and repair unit to insure the best military economy benefit for weapon equipment. At last, program for the model was designed, and the model was validated and analyzed by an example in this paper.

Spare part

10.1109/kam.2009.219

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Citations (5)

Experimental Study on Shrinkage Characteristic of Merchandise Concrete

Journal of Zhengzhou University (2004)

Yanmei Lv

Through the measurement of the shrinkage strain of 99 lumps of merchandise concrete in 24 groups in succeeding 180 days, this paper analyses and works out the computing formula about shrinkage strain of merchandise concrete under standard condition. Multi-coefficient computing formula about shrinkage strain of merchandise concrete under nonstandard conditions e(t)=e(t)_0β_1β_2β_3β_4β_5 is given with the multi-coefficient superposition method, and at the same time, how to determine each influence coefficient is given.At last, this paper makes an analysis and comparison of the formula proposed in this paper、ACI formula and Wang Tiemeng formula,which shows that this new formla works better for the merchandise concrete.

Shrinkage

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TWO-DIMENSIONAL IMAGING ALGORITHM BASED ON LINEAR PROGNOSIS FOR SPACE TARGET IN BISTATIC ISAR SYSTEM

Ning Han Yanmei Lv Wang Gefang Mingfei Xia

In bistatic inverse synthetic aperture radar (Bi-ISAR) system, its image resolution is lower than monostatic ISAR system. In order to solve this problem, the linear prognosis algorithm is adopted in the imaging process and the imaging algorithm based on linear prognosis is put forward. Space target Bi-ISAR imaging is taken as the example in research. The one-dimensional range profile is created through pulse compression. Before the azimuth compression, burg entropy maximum algorithm in Levinson recursive method is adopted in estimating the prognosis coefficients and the azimuth echo data. Then Fourier transformation is used to compress the azimuth data in order to get the high resolution azimuth image. This imaging method can obtain the two-dimensional image with the resolution equal to the monostatic ISAR or even higher than it. Simulation experiments verify the effectiveness and availability of the algorithm.

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Penggen and Dougen——About the Relationship between Words and the Figures in Advertisement

Journal of Hengshui University (2008)

Yanmei Lv

In the essay,the plane design of advertisement is compared to penggen and dougeng.It emphasizes that words and figures in advertisement express the information of advertisement through supporting,cooperating and complementing to each other.It also reflects the necessary connection between words and figures in the design of advertisement and analyzes the mutual cooperation of words and figures in advertisement.

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L₁ adaptive block backstepping control of MIMO nonlinear system with uncertainty

2022 34th Chinese Control and Decision Conference (CCDC) (2017)

Hongtao Zhen Niu Gang Yanmei Lv Dong Zhang Jia Yu

Based on L ₁ adaptive control theory, a novel block backstepping control for a class of uncertain multiple-input-multiple-output nonlinear system is proposed. The matched system parametric uncertainty and unmatched general uncertainty including modeling error and external disturbance are considered in the design. The L ₁ adaptive control is integrated with block backstepping to improve the transient performance in addition to stable tracking. The low-pass filter is adopted to guarantee fast adaptive rate without generating high-frequency oscillations in control signal and ensure its smoothness. A reference system is introduced to prove the stability of the closed-loop system via L ₁ adaptive theory and Lyapunov theorem. Finally, numeral simulation results show the transient performance and feasibility of the proposed adaptive control.

Lyapunov stability

10.1109/ccdc.2017.7979443

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Citations (1)

Simulation and research on the repairable valuable spare parts inventory model in weapon equipment

Yanmei Lv Jiangsheng Sun Sujian Li Weimin Liu

Depended on the practical background of spare parts repair and supply for weapon equipment in PLA, used for reference from the result of studying on repairable inventory model theory at home and abroad, this paper establishes the valuable spare parts inventory model under the system of threee-chelon repair and supply by studying on the typical METRIC model and theory. The optimal inventory strategy for different echelon could be obtained from the model by thoroughly discussing the parameters such as cost for order, stock level and back order etc, and then, the optimal military and economic efficiency of weapon equipment support could be obtained. The simulation of the three-echelon inventory mode established in this paper will be faced with more difficult problem. The flow of the multi-echelon inventory model of weapon repairable valuable spare parts is set up in this paper. At last, an example is simulated and analysed also.

Spare part

Weapon system

Stockout

10.1109/ical.2008.4636673

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Citations (1)

Clinical Observation on the Prevention and Treatment of Juvenile Mild Myopia with Traditional Chinese Medicine Comprehensive Therapy

Journal of Clinical and Nursing Research (2022)

Shujuan Han Jianchao Li Yanmei Lv Ruiwen Wang

Objective: To observe the clinical effect of traditional Chinese medicine on the prevention and treatment of juvenile mild myopia. Methods: One hundred and twenty cases of juvenile mild myopia were randomly divided into six groups, with 20 cases in each group: western medicine group, ultrasonic group, acupuncture group, auricular point group, traditional Chinese oral decoction group, and traditional Chinese medicine comprehensive therapy group. The therapeutic effects of the treatment administered to the six groups were compared. Result: In the post-treatment and follow-up stages, the visual acuity of the traditional Chinese medicine comprehensive therapy group significantly improved along with reduced diopter compared to the other groups (p < 0.05). However, the axial length of the six groups had no significant change compared with that before treatment (p > 0.05). There were no adverse reactions in any of the patients. Conclusion: In the treatment of juvenile mild myopia, traditional Chinese medicine comprehensive therapy has good therapeutic effect without any adverse reactions; thus, it is worthy of clinical promotion.

Therapeutic effect

Decoction

10.26689/jcnr.v6i3.3979

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Research of the testing equipment for navigation electron system of the UAV

International Conference on Electrical and Control Engineering (2011)

Yanmei Lv Dong Zhang Xu AiHua

The procedure of testing the navigation electron system of the UAV in the traditional way is very complicated and costs lots of resources, which influences the formation of combating effectiveness of the UAV. In order to solve the problem mentioned above, this paper designed and implemented a portable testing equipment for navigation electron system on the UAV. By using the equipment, fast testing and fault diagnosis of the navigation electron can be done. And the implementation of the equipment greatly improves the maintainability, supportability and the reliability of the UAV system, which makes great military senses.

Maintainability

Navigation System

System testing

Maintenance engineering

10.1109/iceceng.2011.6057590

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Rotating Align Method of Points-Cloud Under Different Viewpoints

Ordnance Industry Automation (2007)

Yanmei Lv

Aiming at the align problem of points-cloud measured by laser under different viewpoints,a circumrotated align method based on rotating platform is adopted.At first,the customized demarcate chart is installed on rotating platform,and the measure is carried through laser digitizer,the center axes parameter of rotated platform is obtained by computer.Then,the points-cloud under different viewpoints is aligned in the rough with the center axes parameter and rotating angle parameter of rotated platform.Finally,the accurate align is accomplished by Iterative Closest Points(ICP).

Viewpoints

Center (category theory)

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Research on the Multi-echelon Inventory Model of Weapon Equipment Repairable Valuable Spare Parts

Jiangsheng Sun Sujian Li Zhao Fang-geng Yanmei Lv

Depended on the practical background of spare parts repair and supply for weapon equipment in PLA, used for reference from the result of studying on repairable inventory model theory at home and abroad, this paper establishes the valuable spare parts inventory model under the system of three-echelon repair and supply by studying on the typical METRIC(Multi-Echelon Technique for Recoverable Item Control) model and theory. The optimal inventory strategy for different echelon could be obtained from the model by thoroughly discussing the parameters such as cost for order, stock level and back order etc, and then, the optimal military and economic efficiency of weapon equipment support could be obtained. At last, the multi-echelon inventory model of weapon equipment repairable valuable spare parts is simulated and analyzed also.

Spare part

Weapon system

Inventory cost

Stockout

ABC analysis

10.1109/ical.2007.4338646

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Citations (4)