Optimal Stealthy Attack With Side Information Under the Energy Constraint on Remote State Estimation

Sheng-Sheng Dong,Yi-Gang Li,Li Chen,Xiaoling Zhang 제어·로봇·시스템학회 2024 International Journal of Control, Automation, and Vol.22 No.9

This work considers the innovation-based attacks with side information under the energy constraint in cyber-physical systems where Kullback-Leibler (K-L) divergence is used as the stealthiness metric. Moreover, the attacker requires to decide when to launch attacks over a finite time horizon since the energy limitation. To cause the largest degradation to the estimation performance, the attack strategy and schedule require to be designed synergistically under the constraints. The terminal error (TE) and average error (AE) are respectively taken as attack performance indices. Then, the optimal attack policies for the TE and AE are obtained by solving a constrained optimization problem and a 0-1 programming problem. Finally, simulation examples are employed to demonstrate the results.

Role of Red Light, Temperature, Stratification and Nitrogen in Breaking Seed Dormancy of Chenopodium album L.

Dong-Sheng Tang,Muhammad Hamayun,Young-Moon Ko,Yi-Ping Zhang,강상모,이인정 한국작물학회 2008 Journal of crop science and biotechnology Vol.11 No.3

Seed dormancy behavior of weed seeds is a critical determinant of their survival rates in a given cropping system as it helps the weeds toevade herbicides and other weeding practices. We investigated the effects of red light, alternating temperature, stratification duration anddifferent doses of nitrogen containing compounds alone or in combination with red light on breaking seed dormancy of Chenopodiumalbum L. The application of red light (80 μmols-1m-2) significantly increased seed germination of C. album in all treatments. Germinationrates of 12 h incubated seeds were highest under 20 min of red light irradiation than 1 min, 5 min and 10 min treated seeds. Germinationrate was significantly higher at alternating temperatures of 25°C and 5°C for 12 h each with an irradiation of red light (80 μmols-1 m-2) for10 min than other treatments. Stratification period of 15 days significantly stimulated germination percentage of seeds incubated in dark,although 5 days of stratification along with red light application for 10 minutes exhibit similar effects on seeds. Seed germination was alsoenhanced by nitrogen containing compounds like NaNO2, KNO3, NH4Cl and NH4NO3. We observed that seed germination increased significantlywith 25 mM KNO3 and 10 mM NH4NO3 in dark condition, while NaNO2 and NH4Cl enhanced seed germination under red lightirradiation. It was concluded that red light alone or synergized with alternating temperatures, stratification and nitrogen compounds, especiallynitrite and ammonium enhanced seed germination of C. album. Thus, the red light can play a vital role in present and future weedmanagement strategies.

Tracking Control of Podded Propulsion Unmanned Surface Vehicle with Unknown Dynamics and Disturbance Under Input Saturation

Dong-Dong Mu,Guo-Feng Wang,Yun-Sheng Fan 제어·로봇·시스템학회 2018 International Journal of Control, Automation, and Vol.16 No.4

This paper addresses two interrelated problems concerning the tracking control of podded propulsion unmanned surface vehicle (USV), namely, the modeling of podded propulsion USV, and trajectory tracking controller design. Based on the force analysis, the separation model of podded propulsion USV is established. Furthermore, a practical adaptive neural tracking controller is proposed by backstepping technique, neural network minimum parameter learning method, neural shunting model and auxiliary dynamic system without the exact information of hydrodynamic damping structure and the sea disturbances. Using Lyapunov stability analysis theory, it is proven that all error signals in the system are uniformly ultimately bounded. The advantages of the paper are that first, the underactuated characteristic of podded propulsion USV is demonstrated; then, neural shunting model and neural network minimum parameter learning method are introduced to cope with the problem of "explosion of complexity" and uncertainty factors, respectively; third, auxiliary dynamic system is introduced into controller design to reduce the risk of actuator saturation. Taking into account the above practical problems is helpful to engineering implementation in the marine practice. Finally, numerical simulation has been given to demonstrate the effectiveness of the proposed scheme.

Effect of annealing atmosphere on volatility of Bi in SrBi2Ta2O9 thin films

Dong-Sheng Wang 한양대학교 세라믹연구소 2014 Journal of Ceramic Processing Research Vol.15 No.2

The changes of structure and chemical composition of SrBi2Ta2O9 (SBT) thin films, which were annealed at 500 o C in N2 and forming gas (5%H2 + 95%N2), were investigated. Cross sectional morphology of SBT film was observed by scanning electron microscopy. The chemical composition and state were determined by using X-ray photoelectron microscopy and Auger electron spectrometer, respectively. N2 played a different role in annealing processes from forming gas. In the case of forming gas annealing, Bi element was reduced and appeared on the surface of SBT film or inside Si substrate. In the case of N2 annealing, only slight inter-diffusion occurs at SBT/Pt interface and small amounts of Bi are seen at Pt electrode layer. It could be attributed to the high annealing temperature. Compared with films annealed in forming gas, SBT films annealed in N2 exhibit better microstructure quality.

Experimental and numerical validation of guided wave based on time-reversal for evaluating grouting defects of multi-interface sleeve

Dong-Sheng Li,Jiahe Liu,Li Tang,Wei Shen 국제구조공학회 2024 Smart Structures and Systems, An International Jou Vol.33 No.1

Grouting sleeves are an essential connecting component of prefabricated components, and the quality of grouting has a significant influence on structural integrity and seismic performance. The embedded grouting sleeve (EGS)'s grouting defects are highly undetectable and random, and no effective monitoring method exists. This paper proposes an ultrasonic guided wave method and provides a set of guidelines for selecting the optimal frequency and suitable period for the EGS. The optimal frequency was determined by considering the group velocity, wave structure, and wave attenuation of the selected mode. Guided waves are prone to multi-modality, modal conversion, energy leakage, and dispersion in the EGS, which is a multi-layer structure. Therefore, a time-reversal (TR)-based multi-mode focusing and dispersion automatic compensation technology is introduced to eliminate the multi-mode phase difference in the EGS. First, the influence of defects on guided waves is analyzed according to the TR coefficient. Second, two major types of damage indicators, namely, the time domain and the wavelet packet energy, are constructed according to the influence method. The constructed wavelet packet energy indicator is more sensitive to the changes of defecting than the conventional time-domain similarity indicator. Both numerical and experimental results show that the proposed method is feasible and beneficial for the detection and quantitative estimation of the grouting defects of the EGS.

Fibulin-5 is a Prognostic Marker that Contributes to Proliferation and Invasion of Human Glioma Cells

Sheng, Xu-Dong,Chen, Hu,Wang, Hui,Ding, Zhi-Bin,Xu, Gang-Zhu,Zhang, Jun-Feng,Lu, Wen-Chao,Wu, Tao,Zhao, Ling Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.2

Fibulin-5 has recently been considered as a potential tumor suppressor in human cancers. Several studies have shown that it is down-regulated in a variety of tumor types and inhibits tumor growth and metastasis. This study was aimed to investigate the clinical significance of fibulin-5 in glioma and its role in cell proliferation and invasion. We found that the expression of fibulin-5 in glioma tissues was significantly lower than those in normal brain (NB) tissues. Negative expression was significantly correlated with advanced clinical stage (grade III+IV). Furthermore, Fibulin-5 negative expression was correlated with a shorter overall survival of glioma patients. Multivariate Cox repression analysis indicated that fibulin-5 was an independent factor for predicting overall survival of glioma patients. Overexpression obviously inhibited cell proliferation in U251 and U87 cells. Furthermore, it significantly reduced the number of migrating and invading glioma cells. In conclusion, impaired expression of fibulin-5 is correlated with the advanced tumor stage in glioma. Otherwise, Fibulin-5 is an independent prognostic marker for predicting overall survival of glioma patients. Mechanistically, it may function as a tumor suppressor via inhibiting cell proliferation and invasion in gliomas.

Sperm-mediated Gene Transfer in the Chinese Honeybee, Apis cerana cerana (Hymenoptera: Apidae)

Dong-Sheng Guo,Liang-Xian Sun,Zhi-Jiang Zeng,Xian-Bing Xie 한국응용곤충학회 2007 Journal of Asia-Pacific Entomology Vol.10 No.4

Transgenic Apis cerana cerana were produced by sperm-mediated gene transfer (SMGT). In the experiment, the foreign DNA was linearized and introduced with sperm during the instrumental insemination of virgin queen. The descendants of the experimental colonies were analyzed. In the green fluorescent-positive offspring, green fluorescence was observed for 1- to 2-day-old larvae, the predicted fragment was isolated by means of PCR amplification of genomic DNA and the expression of transferred genes was confirmed at transcriptional level by reverse transcription-polymerase chain reaction. These results showed that the exogenous gene could be integrated in a fraction of the germ line cells of the queen Apis cerana cerana and transmitted to offspring by SMGT.

Formation Control Strategy for Underactuated Unmanned Surface Vehicles Subject to Unknown Dynamics and External Disturbances with Input Saturation

Dong-Dong Mu,Guo-Feng Wang,Yun-Sheng Fan 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.11

This paper addresses the formation tracking control problem of multiple underactuated unmanned surface vehicles. Considering many actual situations, a practical formation control scheme, which is performed by using a leader-follower approach, minimum learning parameter technique, adaptive technology and so on. Firstly, a virtual unmanned surface vehicle is designed according to the location information of the leader unmanned surface vehicle to estimate the leader’s speed information while reducing the communication bandwidth. Secondly, a formationcontrol law is designed to make the follower underactuated unmanned surface vehicles track the leader. Unknown dynamics and external disturbances are regarded as a whole and compensated by the minimum learning parameter technique instead of multi-layer neural network and the neural shunt model can handle multiple derivation problems of virtual control laws. Meanwhile, the robustness of the controlled system is improved through adaptive technology. Besides, an auxiliary design system is employed to constrain the output range of the control law. Finally, numerical simulations are implemented to prove the feasibility of the formation tracking control strategy.

Design of Adaptive Neural Tracking Controller for Pod Propulsion Unmanned Vessel Subject to Unknown Dynamics

Dong-Dong Mu,Guo-Feng Wang,Yun-Sheng Fan 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.6

This paper addresses two interrelated problems concerning the tracking control of pod propulsion unmanned surface vessel (USV), namely, the modeling of pod propulsion USV, and tracking controller design. First, based on MMG modeling theory, the model of pod propulsion USV is derived. Furthermore, a practical adaptive neural tracking controller is proposed by backstepping technique, neural network approximation and adaptive method. Meanwhile, unlike some existing tracking methods for surface vessel whose control algorithms suffer from “explosion of complexity”, a novel neural shunting model is introduced to solve the problem. Using a Lyapunov functional, it is proven that all error signals in the system are uniformly ultimately bounded. The advantages of the paper are that first, the underactuated characteristic of pod propulsion USV is proved; second, the neural shunting model is used to solve the problem of “explosion of complexity”, and this is a combination of knowledge in the field of biology and engineering; third, the developed controller is able to capture the uncertainties without the exact information of hydrodynamic damping structure and the sea disturbances. Numerical examples have been given to illustrate the performance and effectiveness of the proposed scheme.

Fertility Restoring of Interspecific Hybrids between Lilium nobilissimum and L. regale by Chromosome Doubling

Dong-Sheng Han,Yoshiji Niimi 한국원예학회 2006 한국원예학회 기타간행물 Vol.- No.-