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Distributed Security Control for Complex Cyber-physical Systems Against Denial-of-service Attacks
Xiaojie Huang,Da-Wei Ding,Zhiqiang Li,Cuijuan An 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.2
This paper investigates the problem of distributed security control for complex cyber-physical systems against denial-of-service (DoS) attacks. A distributed security controller with interconnected control nodes is proposed on the basis of piecewise Lyapunov functions. The bounds of attack frequency and attack duration are explicitly calculated to achieve security synchronization. Meanwhile, an event-based data update strategy is proposed to resist the negative influence of DoS attacks on data transmission. Finally, a simulation example is given to verify the effectiveness of the proposed method.
Stereo-Vision based Obstacle Avoidance by Finding Safe Region
Xiaojie Zhao,Gang Wang,Maozhi Cai,Hongkun Zhou 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.3
This paper presents an online obstacle localization and avoidance scheme for aerial vehicles over theorder of seconds for general aviation. The scheme contains three stages. In the first stage, stereo visual odometry isadopted to locate the local positions of the obstacles, and the local positions are fused with global positioning system(GPS) or differential GPS to obtain global map information. In the second stage, we search the safety areas on thebasis of depth image obtained by semi-global Matching (SGM) algorithm and computing safety points of everyframe. In the third stage, the smooth trajectory is planned in real-time based on the map and those safety pointsthrough receding horizon control based mixed integer linear programming (MILP). Simulations and experimentsverified the feasibility of the proposed scheme.
Cooperative Localization Based on Robust GPS and Radar Fusion for Multiple Aerial Vehicles
Xiaojie Zhao,Gang Wang,Shuzhi Sam Ge 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.2
This paper presents a localization framework for multiple aerial vehicles (AVs) based on sensor fusion ofglobal positioning system (GPS) and the identification friend-or-foe (IFF) Radar system. The IFF-Radar play tworoles: firstly, it detects the angle and the range between two AVs, and thus the path between the two vehicles can bemodeled as a curve. Secondly, it detects which AV helps form the above curve, and receives the corresponding GPSinformation from the friend vehicle. Through the cooperation of the multiple AVs, not only GPS can work wellwith fewer satellites due to the block of canyon environments, but also differential GPS (DGPS) performance canbe achieved when the place is beyond the coverage of the DGPS. Theoretical analysis shows that two GPS satellitesare sufficient to obtain the location information with the help of two or more friend vehicles, and the performanceis as accurate as DGPS with the help of two or more friend vehicles. Simulations show that the proposed approachcan achieve better localization by the cooperation among multiple aerial vehicles than single aerial vehicle.
Newsvendor Game with Supply Uncertainty
Xiaojie Yan,Jun Shi 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.6
In this paper, we study the newsvendor game with supply uncertainty, where multiple retailers form a coalition to cooperate to place orders to minimize the cost and share risk facing uncertain supplies and demands. After the orders are delivered and the demands are realized, the actual arrival quantities are allocated among the retailers to minimize the total cost. We compute the cost functions by using two-stage stochastic programming model and show that the cooperative game has a nonempty core. Also we propose a method to calculate an allocation in the core.
Preparation and BSA Adsorption Behavior of Chitosan-arginine Based Nanofiber Membranes
Xiaojie Li,Guiqun Chao,Liangan Wang,Xianlin Xu,Zhanjun Cai,Lei Shi,Xupin Zhuang,Bo-wen Cheng 한국섬유공학회 2018 Fibers and polymers Vol.19 No.5
In this work, an affinity nanofiber membrane was successfully prepared by solution blowing of arginine-modified chitosan (CS-Arg) for bovine serum albumin (BSA) adsorption. CS-Arg was firstly synthesized by coupling L-arginine onto chitosan backbone. Then, CS-Arg nanofiber membranes (CANFs) were fabricated using solution blowing process with Polylactide (PLA) as assistant polymer. The results showed that CANFs effectively adsorbed BSA, and the adsorption capacities were influenced by the degrees of substitution (DS) of arginine in CS, pH value, contact time, and initial protein concentration. The highest adsorption capacity of 445.19 mg/g was achieved uvnder the following conditions: DS of 43.7 %, pH of 7.14, and initial concentration of 3.0 mg/ml. BSA adsorbed on the CANFs membrane conformed to Langmuir model, and the adsorption rate was consistent with the second-order kinetics model. This work implies that an arginine-modified chitosan nanofiber-based novel biomaterial has a potential application in adsorption of BSA.
ON C-STIELTJES INTEGRAL OF BANACH-VALUED FUNCTIONS
Xiaojie Zhang,Dafang Zhao,Guokju Ye 한국수학교육학회 2007 純粹 및 應用數學 Vol.14 No.2
In this paper, we define the C-Stieltjes integral of the functions mapping an interval [a,b] into a Banach space X with respect to g on [a,b], and the C-Stieltjes representable operators for the vector-valued functions which are the generalizations of the Henstock-Stieltjes representable operators. Some properties of the C-Stieltjes operators and the convergence theorems of the C-Stieltjes integral are given.
A New Variable Refrigerant Flow System Simulation Approach in EnergyPlus
Xiaojie Lin,Hoseong Lee,Yunho Hwang,REINHARD RADERMACHER,Byung-Soon Kim 대한설비공학회 2016 International Journal of Air-Conditioning and Refr Vol.24 No.1
A variable refrigerant °ow (VRF) system is widely applied to build air conditioning systems. Literature review of previous VRF modeling studies was conducted, and it was found that the current calculation approach in EnergyPlus can result in more than 20% deviation in both heat transfer capacity and power consumption. Therefore, a new VRF model is proposed in this study, which includes an improved thermal zone distribution concept, new indoor unit types, and a new thermodynamic model. The developed model is validated with experimental data within 10% in heat transfer capacity and 5% in power consumption. Based on the proposed model, the operation control strategy is also discussed. The results show that the proposed model could also simulate the current control strategy in the VRF system.