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A 3-prismatic-revolute-spherical compliant parallel platform for optoelectronic packaging
Hongwei Xu,Haibo Zhou,Shuaixia Tan,Zhiping Kong,Ji-An Duan 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.6
To align the optical channels of optoelectronic appliances, a 3-prismaticrevolute-spherical (3-PRS) compliant parallel platform (CPP) is proposed in this work. The platform has special large stroke compliant joints. Attention is paid to the establishment of the inverse kinematics model and the analysis of the parasitic motion (PM) of the platform. A prototype of the platform is also presented, and its accuracy is experimentally evaluated. Besides, the platform is employed as a 3 degree-of-freedom (DOF) platform for optoelectronic packaging. Furthermore, the closed-loop control strategy requires merely one optical power meter to avoid the use of complex multiple DOF detection devices. In this respect, the influence of the precision of inverse kinematics solution on the optoelectronic packaging is reduced. Moreover, a compensation rule is employed to minimize the effect of PM on the motion accuracy of the platform. The results show that the proposed 3-PRS CPP is highly efficient for optoelectronic packaging.
Hongwei Fang,Yixiang Xu,Guowen Xu 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.5
The seismic slip line field theory (SLFT) is derived based on the method of characteristic, and the critical slope contour calculated by the SLFT is a convex shape when a high surcharge is imposed on the slope top surface. A simple and robustness failure mechanism is proposed to calculate the static and seismic ultimate bearing capacity of strip footing adjacent to the cohesion-frictional slopes where the critical slope contour shifts from the inside of the slope to the outside of the slope with the increase of the boundary load, and the slope is at the limit state when the critical slope contour is tangent to the slope surface. The influence of slope and footing geometric features, soil parameters, and the seismic load on the bearing capacity is analyzed. The ultimate bearing capacity decreases as the strength parameters decreases, and the slope angle and the seismic coefficient increases. The static and seismic bearing capacity calculated by the proposed method does not require the failure models to be initially assumed, and the results are consistent with those of the other methods.
Hongwei Lu,Jianxin Du,Cuiping Yu,Xingping Wang,Yanlin Gao,Weizhong Xu,Aiping Liu,Xiaoxiao Lu,Yingxin Chen 한국고분자학회 2020 Macromolecular Research Vol.28 No.6
The development of high dielectric materials with high energy densities is a crucial research domain in the modern microelectronics and power systems. The objective of this work was to develop the highly ordered crystal orientations and large ferroelectric crystalline β/γ-phases in the biaxially oriented poly(vinylidene fluoride) (BOPVDF). Importantly, a high discharged energy density and high dielectric constant was achieved by using a high-electric-induced technique. A suitable poling electric field was applied to the BOPVDF films in order to enhance the breakdown strength. Remarkably, the BOPVDF film poled at the electric field of 113 MV m-1 achieved an unprecedented discharged energy density of 25.4 J cm-3 at an ultra-high electric field of 550 MV m-1, which is by far the highest value ever achieved in flexible polymer-based capacitor films. Comparatively, the unpoled BOPVDF and commercial biaxially oriented polypropylene (BOPP) exhibited only a discharged energy density of 7.9 J cm-3 and 1.2 J cm-3, respectively. This systematic study provides a new design paradigm to exploit PVDF-based dielectric polymers for capacitor applications.
A Multi-factor SLA Negotiation Model Based on Evolutionary Game in Cloud Environment
Hongwei Chen,Xiaojuan Liu,Hui Xu 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.7
Service providers and service consumers in the cloud environment are two important subjects to regulate the cloud computing market and the interests of the game between these two have a certain dynamic. Therefore, in this paper, a framework of SLA negotiation based on evolutionary game theory is proposed in the cloud environment, and the purposes are not only that the parties can negotiate successfully, but also that it clearly demonstrates dynamic evolutionary game process of the participant groups and the internal of the groups. The experimental results show that there are two long-term stable strategies of service providers and service consumers: Firstly, if the service providers take high-quality strategy, then service consumers adopt the high-price strategy; secondly, if service providers take low-quality strategy, then service consumers adopt the low-price strategy. And the analysis by the evolutionary game model and the evolutionary game path shows that the cooperation of the service providers and the service consumers in the consultation are mainly affected by the direct incomes, the distribution percentage, the preferential subsidies, the violation penalties, the violation revenues, the payment costs and other factors .
Xu Deling,Li Xiaoyu,Zhou Hong,Song Hongwei 인하대학교 정석물류통상연구원 2009 인하대학교 정석물류통상연구원 학술대회 Vol.2009 No.10
According to research on new energy and highly efficient energy-saving technology industry in Tianjin, the paper has been applying for domestic and international measurements drawing in the international competitiveness to conduct several achievements on the following fields, such as designing a index system to analyze international competitiveness of large and medium-sized high-tech state-owned enterprises in Tianjin, utilizing AHP and Illegibility Model to evaluate international competitiveness in biomedical industry of large and medium-sized state-owned high-tech enterprises in Tianjin so as to promote some proper countermeasures.
Preparation and Self-Healing Behaviors of Poly(acrylic acid)/Cerium Ions Double Network Hydrogels
Hongwei Zhou,Guohe Xu,Jie Li,Shihao Zeng,Xiaolong Zhang,Zhaohui Zheng,Xiaobin Ding,Weixing Chen,Qiguan Wang,Wenzhi Zhang 한국고분자학회 2015 Macromolecular Research Vol.23 No.12
This work aims at developing an approach to poly(acrylic acid)/cerium ions (PAA/cerium ions) double network hydrogels and exploring the self-healing properties of the hydrogels, with expectation to provide some clues for constructing new healable gel actuators and enrich the family of self-healable hydrogels. The hydrogel is covalently crosslinked by a traditional crosslinking agent N,N'-methylene bis-acrylamide to form the first network and further physically crosslinked by the ionic interaction between cerium ions and the carboxyl groups in the hydrogel network. The preparation method and self-healing behaviors of the hydrogels are investigated.
Hongwei Chen,Xiaojuan Liu,Hui Xu,Chunzhi Wang 보안공학연구지원센터 2016 International Journal of Grid and Distributed Comp Vol.9 No.9
In recent years, with the development of cloud computing, more and more service providers appear, making the cloud computing market more open and competitive. However, it is difficult for service consumers to choose the most suitable service provider for their own, especially for the service providers to provide the best service in the negotiated price, while the service providers and the service consumers themselves can't automatically negotiate, thus in this paper, we propose a cloud service broker framework based on dynamic game theory for bilateral SLA negotiation in cloud environment, aiming for successful negotiation among participators. This paper also proposes a Nash equilibrium point and a satisfaction degree difference algorithm, aiming to find the optimal value of SLA attributes (price and bandwidth) at the minimum satisfaction degree difference among the participators. Experimental results show that the service consumers and the service providers are able to achieve the same satisfaction degree on price and bandwidth.
An Experimental Study of an SMA-Based Self-Centering Damper
Hongwei Ma,Jiaxin Xu,Shaofeng Li 한국강구조학회 2022 International Journal of Steel Structures Vol.22 No.2
The self-centering energy dissipation devices can reduce or avoid the residual inter-storey drifts of structures. This study aims a shape memory alloy (SMA) -based self-centering damper that employs the pre-tensioned SMA wires and pre-compressed springs as energy dissipating group and re-centering group, respectively. Compared with the conventional self-centering dampers which mainly use SMA wires to off er restoring forces, this damper possesses much reliable re-centering capability. The confi gurations, detailed assembly process and working principle of the damper are introduced. In order to evaluate the hysteretic behaviour of the damper, a damper specimen was manufactured and a series of quasi-static mechanical tests were conducted on the specimen with considering the infl uence of load amplitude and loading frequency. The results indicate that the dissipated energy per cycle greatly increases while the equivalent viscous damping ratio shows a slight change with the increase of load amplitude. Loading frequency has a great infl uence on the equivalent viscous damping ratio of the damper. To improve the energy dissipating capacity of the damper with maintaining its full re-centering capability, it is suggested that the pre-compression force applied to springs should be equal to the force diff erence between the two groups SMA wires at the equilibrium position.