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Pseudo-Hermitian topology in multiband non-Hermitian systems

Physical Review A 2025年第4期111卷 042205-042205页

作者： Jung-Wan Ryu Jae-Ho Han Chang-Hwan Yi Hee Chul Park Moon Jip Park Center for Theoretical Physics of Complex Systems Institute for Basic Science (IBS) Daejeon 34126 Republic of Korea Basic Science Program Korea University of Science and Technology (UST) Daejeon 34113 Republic of Korea Department of Physics Korea Advanced Institute of Science and Technology (KAIST) Daejeon 34141 Republic of Korea Department of Physics Pukyong National University Busan 48513 Republic of Korea Department of Physics Hanyang University Seoul 04763 Republic of Korea Research Institute for Natural Science and High Pressure Hanyang University Seoul 04763 South Korea

The complex eigenenergies and nonorthogonal eigenstates of non-Hermitian systems exhibit unique topological phenomena that cannot appear in Hermitian systems. Representative examples are the non-Hermitian skin effect and exceptional points. In a two-dimensional parameter space, topological classifications of nonseparable bands in multiband non-Hermitian systems can be established by invoking a permutation group, where the product of the permutation represents state exchange due to exceptional points in the space. We unveil in this work the role of pseudo-Hermitian lines in non-Hermitian topology for multiple bands. In particular, the nonseparability of non-Hermitian multibands can be topologically nontrivial without exceptional points in two-dimensional space. As a physical illustration of the role of pseudo-Hermitian lines, we examine a multiband structure of a photonic crystal system with lossy materials. Our work builds on the fundamental and comprehensive understanding of non-Hermitian multiband systems and also offers versatile applications and realizations of non-Hermitian systems without the need to consider exceptional points.

关键词： Photonic crystals

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Ramp metering based on adaptive critic designs

Ramp metering based on adaptive critic designs

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ITSC 2006: 2006 IEEE Intelligent Transportation systems Conference

作者： Xu, Jing Yu, Wen-Sheng Wang, Fei-Yue Institute of Automation Chinese Academy of Sciences Beijing 100080 China University of Arizonas Systems and Industrial Engineering Department Program in Advanced Research of Complex Systems Key Laboratory of Complex Systems and Intelligence Science Chinese Academy of Sciences

ISBN: (纸本)1424400945

This paper presents the technique of adaptive critic designs (ACDs) for resolving some traffic control problems, such as urban traffic signal control, ramp metering, highway speed control and so on. ACDs are adaptive optimal methods, whose main idea is to approximate dynamic programming solutions by using a function approximation structure such as neural networks to approximate the cost function or its derivatives. They combine the positive features of both the traditional dynamic programming (e.g., optimality and feedback) and the neural networks (e.g., numerical and real-time properties). Due to these exciting merits, they are promising in handling the traffic control problems which have strong nonlinear, stochastic and real-time characteristics. In this paper, a close look at two typical adaptive critic designs is conducted. Specifically, we demonstrate the use of a specific adaptive critic design for the local on-ramp metering control problem. Simulation results indicate that the proposed controller has good performance. © 2006 IEEE.

关键词： Traffic control

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Digital and construction of a digital vehicle proving ground

Digital and construction of a digital vehicle proving ground

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2003 IEEE Intelligent Vehicles Symposium, IV 2003

作者： Wang, Fei-Yue Wang, Xiaojing Li, Li Mirchandani, Pit Wang, Zhixue Program for Advanced Research in Complex Systems University of Arizona TucsonAZ United States Key Laboratory for Complex Systems and Intelligence Science Institute of Automation Chinese Academy of Sciences Beijing China National Center for Intelligent Transportation Systems and Engineering Beijing China

ISBN: (纸本)0780378482

关键词： Automobile proving grounds

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An agent-based controller for vehicular automation

An agent-based controller for vehicular automation

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ITSC 2006: 2006 IEEE Intelligent Transportation systems Conference

作者： He, Feng Wang, Fei-Yue Tang, Shuming IEEE Key Laboratory for Complex Systems and Intelligence Science Chinese Academy of Sciences Beijing China Program for Advanced Research in Complex Systems Department of Systems and Industrial Engineering University of Arizona Tucson AZ 85719 United States Institute of Automation Shandong Academy of Sciences Jinan 250014 China

ISBN: (纸本)1424400945

In this paper, we present a design of controller for vehicular automation based on mobile agent technology. In this approach, the control goal is conducted by coordinating active or default agents based on sensory feedback and vehicle conditions. A hosting mechanism determines which agent has the right to control the vehicle and make the decision. Those agents are divided into two groups: default agents which are developed by fuzzy rules, and active agents which are produced by neural networks. Fuzzy agents locate in the vehicle and neural network agents locate in remote server. Two types of agents have similar function but different performance, so those agents produced by neural network can transfer back to the vehicle after learning to replace default fuzzy agents according to mobile agent technology. The performance of the proposed technique is illustrated by simulation studies of a vehicle longitudinal control system. © 2006 IEEE.

关键词： Land vehicle propulsion

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A watch in developments of intelligent tire inspection and monitoring

A watch in developments of intelligent tire inspection and m...

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2005 IEEE International Conference on Vehicular Electronics and Safety

作者： Li, Li Wang, Fei-Yue Zhou, Qunzhi IEEE Department of Systems and Industrial Engineering University of Arizona Tucson AZ 85719 United States Key Laboratory for Complex Systems and Intelligence Science Chinese Academy of Sciences Beijing China Program for Advanced Research in Complex Systems Department of Systems and Industrial Engineering University of Arizona Tucson AZ 85719 United States

ISBN: (纸本)0780394356

The comfort and safety of driving tightly depends on good working condition of the vehicle tires. However, it is not easy for people to estimate tire pressure, temperature and tire/road friction force etc. correctly, especially when driving on road. As a result, numerous novel tire sensors and inspection devices were developed in the last two decades to make driving more safe and comfortable. In addition, these approaches also related to scrap tire pollution and highway noise reduction. This paper presents a brief survey of the recent advances in this field with a special focus on SAW tire sensors. © 2005 IEEE.

关键词： Intelligent vehicle highway systems

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A robust observer designed for vehicle lateral motion estimation

A robust observer designed for vehicle lateral motion estima...

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2005 IEEE Intelligent Vehicles Symposium

ISBN: (纸本)0780389611

Lateral control of vehicles on automated highways often requires accurate estimation of sideslip angle, yaw rate and lateral velocity, which are difficult to measure directly. Thus, several observers (virtual sensors) were developed in the last decade. In order to solve the unhandled estimation inaccuracy problem caused by system parameter variation and/or model uncertainty, a robust observer has been proposed in this paper. It maintains the good disturbance rejection property that derived form previous research, and simultaneously provides acceptable tolerance to model variance and uncertainty. Specially, effects of displacements of sensory, dynamics variance caused by mass/vclocity/friction-coefficients change or nonlinear characteristics are studied. Simulations demonstrate the usefulness of the proposed observer. © 2005 IEEE.

关键词： Intelligent vehicle highway systems

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Modeling interactions in artificial transportation systems using petri net

Modeling interactions in artificial transportation systems u...

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ITSC 2006: 2006 IEEE Intelligent Transportation systems Conference

作者： Zhu, Fenghua Wang, Zhixue Wang, Fei-Yue Tang, Shuming IEEE Key Laboratory of Complex Systems and Intelligence Science Institute of Automation Chinese Academy of Sciences CO 100080 Beijing China Key Laboratory for Complex Systems and Intelligence Science Chinese Academy of Sciences Beijing China Program for Advanced Research in Complex Systems Department of Systems and Industrial Engineering University of Arizona Tucson AZ 85719 United States Institute of Automation Shandong Academy of Sciences Jinan 250014 China

ISBN: (纸本)1424400945

Agents and interactions between them are two key roles in modeling artificial transportation systems. This paper presents a formal theory to describe interactions between agents, which, together with the well developed models to describe components as agents, completes the first step towards establishing the formal structure for artificial transportation systems. By describing individual agents and the interactions between them as independent simple sequence processes and directive communication channels respectively, we models the whole system as one sequential communications system, which is one special type of Petri net. The theory is flexible enough to model diversified interactions between agents, and the resultant model possesses favorable properties. A case study of modeling road network has been conducted for the purpose of illustration. © 2006 IEEE.

关键词： Transportation

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Modeling and analysis of artificial transportation system based on multi-agent technology

Modeling and analysis of artificial transportation system ba...

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ITSC 2006: 2006 IEEE Intelligent Transportation systems Conference

作者： He, Feng Miao, Qinghai Li, Yuantao Wang, Fei-Yue Tang, Shuming IEEE Key Laboratory for Complex Systems and Intelligence Science Chinese Academy of Sciences Beijing China Key Laboratory of Complex Systems and Intelligence Science Institute of Automation Chinese Academy of Sciences CO 100080 Beijing China Program for Advanced Research in Complex Systems Department of Systems and Industrial Engineering University of Arizona Tucson AZ 85719 United States Institute of Automation Shandong Academy of Sciences Jinan 250014 China

ISBN: (纸本)1424400945

This paper presents the multi-agent architecture for artificial transportation system. In this architecture, Petri net is used as basic model to represent agents. At an intersection, the agents are divided into two groups: one for the traffic-signal and the other for the vehicle flow, which are integrated to represent the behavior of this intersection. In addition, those agents can be used as the modularity to represent urban network of more scale. To coordinate different intersection agents, game theory is used to design coordination strategy between agents. The iterated elimination of strictly dominated strategies algorithm is presented to find Nash equilibrium. © 2006 IEEE.

关键词： Transportation

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An LMI approach to robust vehicle steering controller design

An LMI approach to robust vehicle steering controller design

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8th International IEEE Conference on Intelligent Transportation systems

作者： Li, Li Wang, Fei-Yue Zhou, Qunzhi IEEE United States Dept. of Systems and Industrial Engineering Univ. of Arizona Tucson AZ 85719 United States Key Laboratory for Complex Systems and Intelligence Science Chinese Academy of Sciences Beijing China Program for Advanced Research in Complex Systems Dept. of Systems and Industrial Engineering Univ. of Arizona Tucson AZ United States

ISBN: (纸本)0780392159

Being parallel to frequency domain robust steering controller designs, time domain approaches attract considerable interest in the last decade. Based on previous research results, a synthesized time design framework is proposed in this paper. The design task is constructed as a multi-objective optimization problem which simultaneously considers system stabilization, disturbance rejection, actuator saturation and time delay. A mixed L1/H ∞ robust controller is finally obtained by solving a set of linear matrix equalities (LMI) that guarantee driving performance requirements. Simulations show the effectiveness of the proposed design method. © 2005 IEEE.

关键词： Automobile steering equipment

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A CAN and OSEK NM based siren for automobiles

A CAN and OSEK NM based siren for automobiles

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2007 IEEE International Conference on Networking, Sensing and Control, ICNSC'07

作者： Qiao, Xin Wang, Zhixue Sun, Yuan He, Feng Wang, Fei-Yue IEEE Key Laboratory of Complex Systems and Intelligence Science Institute of Automation Chinese Academy of Sciences CO 100080 Beijing China Institute of Computing Chinese Academy of Sciences CO 100080 Beijing China Key Laboratory for Complex Systems and Intelligence Science Chinese Academy of Sciences Beijing China Program for Advanced Research in Complex Systems Department of Systems and Industrial Engineering University of Arizona Tucson AZ 85719 United States

ISBN: (纸本)1424410762

Today, more and more Electronic Control Units have been installed in vehicle, and Controller Area Network is one of the most widely used networks to connect these ECUs, also the architecture of OSEK is increasingly employed into the design of individual ECU and the network. In this paper, we propose a new framework to design the ECU with limited-storage-space. In the framework, an infinite cycle acts as a mainframe, and the code conforming to OSEK NM is inserted into the cycle. A siren of vehicle is developed with this method, and a Hardware-In-Loop test is accomplished. The results show that the framework is available, and the real-time performance of the siren is satisfied. © 2007 IEEE.

关键词： Intelligent vehicle highway systems

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