Study on Net Assessment of Trustworthy Evidence in Teleoperation System for Interplanetary Transportation

Jinjie Wen,Zhengxu Zhao,Qian Zhong 한국정보처리학회 2019 Journal of information processing systems Vol.15 No.6

Critical elements in the China’s Lunar Exploration reside in that the lunar rover travels over the surroundingundetermined environment and it conducts scientific exploration under the ground control via teleoperationsystem. Such an interplanetary transportation mission teleoperation system belongs to the ground applicationsystem in deep space mission, which performs terrain reconstruction, visual positioning, path planning, androver motion control by receiving telemetry data. It plays a vital role in the whole lunar exploration operationand its so-called trustworthy evidence must be assessed before and during its implementation. Taking ISOstandards and China’s national military standards as trustworthy evidence source, the net assessment modeland net assessment method of teleoperation system are established in this paper. The multi-dimensional netassessment model covering the life cycle of software is defined by extracting the trustworthy evidences fromtrustworthy evidence source. The qualitative decisions are converted to quantitative weights through the netassessment method (NAM) combined with fuzzy analytic hierarchy process (FAHP) and entropy weightmethod (EWM) to determine the weight of the evidence elements in the net assessment model. The paperemploys the teleoperation system for interplanetary transportation as a case study. The experimental resultdrawn shows the validity and rationality of net assessment model and method. In the final part of this paper,the untrustworthy elements of the teleoperation system are discovered and an improvement scheme isestablished upon the “net result”. The work completed in this paper has been applied in the development of theteleoperation system of China’s Chang’e-3 (CE-3) “Jade Rabbit-1” and Chang’e-4 (CE-4) “Jade Rabbit-2” roversuccessfully. Besides, it will be implemented in China’s Chang’e-5 (CE-5) mission in 2019. What’s more, it willbe promoted in the Mars exploration mission in 2020. Therefore it is valuable to the development processimprovement of aerospace information system.

Asynchronous Switching Control of Discrete-time Linear System Based on Mode-dependent Average Dwell Time

Jinjie Huang,Xianzhi Hao,Xiaozhen Pan 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.7

In this paper, we investigate the problem of asynchronous switching control for discrete-time linear systems with mode-dependent average dwell time (MDADT) switching and take the time elay constraints of mode-dependent controllers into consideration. In practical, owing to signal transmission, system detection, and the like, switching of controllers is often lagged behind their corresponding subsystems. Therefore, we divide the time interval of a subsystem operating into two parts: the controller-matched and the controller-mismatched. First, the controller of each subsystem is designed according to its mode-dependent parameters. Then, considering the lag time of controllers, the appropriate MDADT is derived based on Lyapunov stability conditions, and the global exponential stability of the asynchronous switched systems is guaranteed. Finally, a numerical example is provided to demonstrate the potential effectiveness of the proposed method.

Event-triggered Networked H∞ Output Tracking Control Based on Dynamic Compensation Controller

Jinjie Huang,Xiaozhen Pan,Xianzhi Hao 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.10

In this paper, the event-triggered H∞ output tracking problem is investigated for networked control systems. In order to reduce the output tracking error as well as to improve network resource utilization, we propose anidea of dynamic compensation controller with the discrete-time event-triggered mechanism, that is, the integral termof tracking error and the state of the reference system are introduced to form states of the augmented system. We firstexamine the dynamic compensation idea by the H∞ output tracking control problem for linear time-invariant (LTI)systems. Then, we model the closed-loop event-triggered networked control system as a time-delay augmented linear system. By constructing a Lyapunov-Krasovskii functional with the delay fractioning technique, the stabilityconditions with lower conservatism are derived in the form of the linear matrix inequalities (LMIs). Furthermore,a method is proposed to design the H∞ dynamic compensation controllers and the discrete-time event-triggeredmechanisms. Finally, the satellite tracking control problem is used as an example to show that the dynamical compensation idea is effective in reducing the tracking error and that the proposed method in this paper can achievebetter performance than that in the existing literature

Experimental research on seismic behavior of novel composite RCS joints

Jinjie Men,Zhifeng Guo,Qingxuan Shi 국제구조공학회 2015 Steel and Composite Structures, An International J Vol.19 No.1

Results from an experimental study on the seismic response of six composite reinforced concrete column-to-steel beam interior joints are presented. The primary variable investigated is the details in the joint. For the basic specimen, the main subassemblies of the beam and column are both continuous, and the steel beam flanges extended to the joint are partly cut off. Transverse beam, steel band plates, cove plates, X shape reinforcement bars and end plates are used in the other five specimens, respectively. After the joint steel panel yielded, two failure modes were observed during the test: local failure in Specimens 1, 2 and 4, shear failure in Specimens 3, 5 and 6. Specimens 6, 3, 5 and 4 have a better strength and deformation capacity than the other two specimens for the effectiveness of their subassemblies. For Specimens 2 and 4, though the performance of strength degradation and stiffness degradation are not as good as the other four specimens, they all have excellent energy dissipation capacity comparing to the RC joint, or the Steel Reinforced Concrete (SRC) joint. Based on the test result, some suggestions are presented for the design of composite RCS joint.

Dynamic Output Feedback H∞ Control for Linear Parameter-varying Systems with Time-delay

Jinjie Huang,Xiaozhen Pan,Xianzhi Hao,Wanda Putra 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.12

In this paper, we address a synthesis problem of the parameter-dependent output feedback H∞ control for linear parameter-varying systems with time-delay. The scheme adopts the parameter-dependent past state information to construct the dynamic output feedback controller. In this case, on basis of the quadratic Lyapunov functional with parameter-dependence, we analyze the parameter-dependent H∞ stability conditions for the closedloop time-delayed linear parameter-varying system in terms of linear matrix inequalities. However, this stability condition is of an infinite-dimension. To derive computationally tractable criteria for the dynamic output feedback controller, several slack variables and a convex relaxation technique are employed to have the infinite-dimensional condition of linear matrix inequalities cast into a finite dimensional convex optimization problem. By solving theconvex optimization problem, we harvest the dynamic output feedback controller with memory for the time-delayed linear parameter-varying system. Finally, two examples are included to illustrate the effectiveness of the proposed approach.

Experimental research on seismic behavior of a composite RCS frame

Jinjie Men,Yarong Zhang,Zhifeng Guo,Qingxuan Shi 국제구조공학회 2015 Steel and Composite Structures, An International J Vol.18 No.4

To promote greater acceptance and use of composite RCS systems, a two-bay two-story frame specimen with improved composite RCS joint details was tested in the laboratory under reversed cyclic loading. The test revealed superior seismic performance with stable load versus story drift response and excellent deformation capacity for an inter-story drift ratio up to 1/25. It was found that the failure process of the frame meets the strong-column weak-beam criterion. Furthermore, cracking inter-story drift ratio and ultimate inter-story drift ratio both satisfy the limitation prescribed by the design code. Additionally, inter-story drift ratios at yielding and peak load stage provide reference data for Performance-Based Seismic Design (PBSD) approaches for composite RCS frames. An advantage over conventional reinforced concrete and steel moment frame systems is that the displacement ductility coefficient of the RCS frame system is much larger. To conclude, the test results prove that composite RCS frame systems perform satisfactorily under simulated earthquake action, which further validates the reliability of this innovative system. Based on the test result, some suggestions are presented for the design of composite RCS frame systems.

Simulation and Analysis of Magnetic Circuit of Water-cooling Magnetorheological Fluid Transmission Device

Jinjie Ji,Zuzhi Tian,Xiangfan Wu,Jin Dou 한국자기학회 2018 Journal of Magnetics Vol.23 No.1

Aiming to solve the problem of magnetorheological transmission heat dissipation, this study designs the magnetic circuit of a water-cooling magnetorheological transmission device based on fundamental electromagnetics theory. Finite element method is used to simulate the magnetic field of the measurement device. Results show that the working magnetic induction can reach 0.56 T when the current is 2.0 A, which can satisfy design requirements. The intensity of magnetic induction in the work space increases with the increase of excitation current and permeability of magnetically conductive material, whereas intensity decreases with the increase of work space size. The thickness and cross-sectional dimension of the guidepost group at the heat-dissipating unit have no significant effect on the intensity distribution of magnetic induction of the entire device.

Optimal Design of Tall Residential Building with RC Shear Wall and with Rectangular Layout

Jinjie, Men,Qingxuan, Shi,Zhijian, He Council on Tall Building and Urban Habitat Korea 2014 International journal of high-rise buildings Vol.3 No.4

The objective of optimization is to present a design process that minimizes the total material consumption while satisfying current codes and specifications. In the research an optimization formulation for RC shear wall structures is proposed. And based on conceptual design methodology, an optimization process is investigated. Then optimal design techniques and specific explanations are introduced for residential buildings with shear wall structure, especially for that with a rectangular layout. An example of 30-story building is presented to illustrate the effectiveness of the proposed optimal design process. Furthermore, the influence of aspect ratio on the concrete consumption and the steel consumption of the superstructure are analyzed for this typical RC shear wall structure; and their relations are obtained by regressive analysis. Finally, the optimal material consumption is suggested for the residential building with RC shear wall structure and with rectangular layout. The relation and the data suggested can be used for guiding the design of similar RC shear wall structures.

Linking empowering leadership to innovative behavior in professional learning communities: the role of psychological empowerment and team psychological safety

Jinjie Zhu,Jihai Yao,Lili Zhang 서울대학교 교육연구소 2019 Asia Pacific Education Review Vol.20 No.4

This study investigates the mediating role of teachers’ psychological empowerment and the moderating role of team psychological safety in the relationship between empowering leadership and teachers’ innovative behavior in teaching and research groups (TR groups) as professional learning communities. In total, 507 teachers from 114 TR groups in China participated in this study. The multilevel model results show that empowering leadership improves teachers’ innovative behavior by increasing teachers’ psychological empowerment, which is not influenced by team psychological safety. A supplementary analysis shows that the relationship between team psychological safety and teachers’ innovative behavior is also mediated by psychological empowerment.

International Knowledge Flows and Productivity: Intra- vs. Inter-Industry Spillovers

Naoto Jinji,Xingyuan Zhang 한국국제경제학회 2015 International Economic Journal Vol.29 No.3

The effects of international knowledge spillovers on total factor productivity (TFP) at the industry level are examined by using a panel of 13 manufacturing industries across 15 OECD countries over 23 years. We distinguish between intra- and inter-industry spillovers from the information on patent applications and citations. Patent data are taken from the Japan Patent Office and the United States Patent and Trademark Office. Using four alternative spatial panel estimation techniques, we find that international knowledge spillovers within the same industry significantly contribute to sectoral TFP. In contrast, there is little evidence of a positive effect of international knowledge spillovers on TFP across industries.