http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Xu Donghui (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
-
Cooperative Task Scheduling and Planning Considering Resource Conflicts and Precedence Constraints
Donghui Li,Hu Su,Xinyi Xu,Qingbin Wang,Jie Qin,Wei Zou 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.24 No.9
The robot-task-sequencing planning problem is investigated in this paper, where multi-robot tasks with resource conflicts and precedence constraints are involved making the problem challenging and complex. An effective approach is proposed to minimize the production cycle time while handling the high complexity effectively. The approach decouples the entire problem into simpler ones and then solves them separately to obtain the final solution. Firstly, given the multi-robot tasks, how to coordinate the operation of each single robot is determined. This is achieved by searching the shortest path in the graph where the tasks are organized in the optimal order without the consideration of resource constraints. Then, the resource allocation is modeled as a constrained assignment problem with the objective of minimal cycle time, which is solved with graph optimization. Consequently, the best-fit robot configurations for task execution are selected according to a heuristic optimality metric, based on which the task execution sequence obtained in previous steps is re-optimized. Finally, the robots involved in the task are regarded as a whole to deduce feasible trajectories. Experimental results demonstrate that the proposed approach can generate solutions where the robot can complete the given tasks effectively with feasible scheduling. Moreover, the proposed approach is successfully implemented in a pragmatic system which tests signals at both ends of components in a circuit board.
-
Behavior and Efficiency of Corrosion Damaged Half-bottle Shaped Struts
Aimin Yuan,Donghui Xu,Shoulong Qian 대한토목학회 2018 KSCE Journal of Civil Engineering Vol.22 No.11
This study investigated the behaviors, strut efficiency factor, and the effective width of corrosion-damaged half-bottle shaped struts. Six half-bottle shaped struts were subjected to varying aimed corrosion levels (0%, 3%, 6%) with different reinforcement mat rotation angles (0o, 45o), and their behaviors and typical failure modes ascertained. Strut efficiency factors and effective width were calculated and evaluated. Average strength of 6% corroded struts was 30% less than those of uncorroded struts. The AASHTO LRFD 2013 process predicted strut efficiency factor of corrosion damaged struts better than ACI 318-14 and EN 1992. Strut effective width also reduced with increasing reinforcement corrosion. The theoretical effective width near the load bearing plate was underestimated compared to the measured effective width, while the effective width far from the load bearing plate was overestimated.
-
Lv Pin,Zhai Yuelin,Su Xunwen,Xu Donghui,Liu Lulu,Liu Ziyang 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.6
With the increasing share of renewable energy such as wind energy in power system, flexible DC transmission technology has become an important way to effectively absorb wind energy. But the problem of synchronous sub-synchronous oscillation becomes more and more serious. To reduce the influence of sub-synchronous oscillation on interconnected systems, a Controller for energy conversion system is proposed. It is used to control the synchronous operation of the doubly-fed fan and the rectifier station to connect the doubly-fed wind farm. First, based on the impedance method, a doubly-fed wind farm and multi-module impedance model considering AC/DC dynamic coupling are established. The control energy conversion of wind power generation system, rectifier station and inverter station is designed. Second, according to Nyquist curve and impedance stability criterion, the change of system stability in the process of adjusting controller parameters is observed. Third, the system structure is simulated by MATLAB software. The effectiveness of the controller in the converter station at both ends of MMC is verified. The results show that the new controller can effectively suppress the current offset caused by SSO, and thus improve the power system stability.
-
Yongtao Lin,Mingyue Zhao,Lin Bai,Hailun Li,Yong Xu,Xiang Li,Juan Xie,Yiyuan Zhang,Donghui Zheng 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.97 No.-
Renal ischemia-reperfusion injury (RI/R) is one of the main causes of acute renal injury and a commonclinical disease with high morbidity and mortality. It is of great significance to deliver microRNAs(miRNAs) to cells and in vivo to realize gene regulation and treatment of related diseases. In this study, wereported that the nanocomplex FMN-17 could realize both therapeutic and functional monitoringsimultaneously in vivo and in vitro. The nanocomplex comprised a cationic cell-penetrating peptidenona-arginine, a targeting ligand folic acid, a caspase-3 responsive moiety, and a Cy imaging moiety. Thenanocomplex FMN-17 has been shown to deliver miR-17-5p efficiently and selectively into HK-2 cells andtissues. Treatment of HK-2 cells with the nanocomplex significantly increased the miR-17-5p level andinhibited apoptosis, as evident by reducing the expression of active caspase-3 and reactive oxygenspecies. Uptake of FMN-17 in vivo alleviated renal tissue injury by histological assessment. In summary,we designed and synthesized a new miRNA delivery system with high transfection efficiency, goodtherapeutic effect, and near-infrared imaging in renal ischemia/reperfusion injury.
-
Bassiouny Saleh,Jinghua Jiang,Aibin Ma,Dan Song,Donghui Yang,Qiong Xu 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.7
The main objective of the present paper is to draw the attention of researchers towards the wear analysis of functionallygraded aluminum matrix composites (FGAMCs) reinforced with different types of particles. The quality of the productsand characteristics achieved by the functionally graded materials (FGMs) has been given increasing attention during recentdecades. FGMs provide a way to obtain gradients between two phases with variations of properties. The centrifuge castingprocess was used to produce continuous variation of graded materials. These continuous graded materials offer high strengthand enhanced wear resistances compared with traditional composite materials. This paper summarizes the effect of the variousreinforcement materials and wear test parameters on microstructure as well as wear properties in the FGAMCs obtainedthrough the centrifugal casting technique. The results found in the reviewed literature are classified according to types ofreinforcement particles (such as silicon carbide, alumina and boron carbide) and the influence of wear test parameters (suchas applied load, sliding distance, duration and sliding speed) on FGM composites. The main conclusions in this paper arederived from previous studies on experimental investigations on the wear characteristics of FGAMCs. The research gapsand future directions have been discussed which will be prolific to the researchers in the design and manufacture of FGMsproduction by centrifugal casting.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
