This paper presents a novel behavioral model for power amplifiers (PAs) that aims to address the inclusion of both high and low-frequency memory effects as well as load impedance mismatch effects. Through the applicat...
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ISBN:
(纸本)9798350362749;9798350362732
This paper presents a novel behavioral model for power amplifiers (PAs) that aims to address the inclusion of both high and low-frequency memory effects as well as load impedance mismatch effects. Through the application of a combined methodology, integrating three-tone characterization with load-pull measurement techniques, the paper attempts to offer a comprehensive modeling of the intricate behaviors of PAs under a large range of operational conditions, including load pull conditions. The proposed model seeks to improve predictive accuracy and support the development of more efficient telecommunications systems by anticipating complex RF system performances. This work aims to provide a robust system simulation framework in the context of the complexity of modern communication signals, which are included in 5G standards.
This paper discusses the behavioralmodeling of Gallium Nitride (GaN) power transistors for the analysis of voltage/current waveforms and losses in hard-switching Switch-Mode Power Supplies (SMPSs), with main emphasis...
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Oceanic turbulence induced irradiance fluctuations is the main impairment of underwater wireless optical communication (UWOC). Accurate modeling of irradiance random variations is crucial for UWOC system design and pe...
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ISBN:
(纸本)9798350378412
Oceanic turbulence induced irradiance fluctuations is the main impairment of underwater wireless optical communication (UWOC). Accurate modeling of irradiance random variations is crucial for UWOC system design and performance evaluation. The Fourier Optics theory-based wave optical simulation (WOS) method is an attractive tool for researching optical wave propagation through turbulent media. In this paper, we develop the WOS criteria and details for oceanic turbulence simulation. Specifically, we generate phase screens (PSs) by use of the recently proposed general oceanic turbulence optical power spectrum (OTOPS) and spectrum inversion approach with sub-harmonic compensation. The analytical phase structure function demonstrates the precision of the generated PSs. Then we create the sampling requirements for WOS process in turbulent ocean. We verify the WOS's effectiveness using the coherent factor at the receiving plane. Lastly, we use the WOS results to perform the irradiance statistics and obtain the probability density functions (PDFs) of the irradiance fluctuations of plane and spherical waves.
One of the intelligent forms in the future war is the intelligent non-crowd combat, which is the key to the requirement of combat simulationmodeling, and the modeling of 'Intelligence' attribute is both the c...
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The majority of theories and models of social influence tend to focus on the social-behavioral level and implicitly discount the potential role of cognitive explanations to ground out social phenomena in cognitive ope...
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ISBN:
(纸本)9783031722400;9783031722417
The majority of theories and models of social influence tend to focus on the social-behavioral level and implicitly discount the potential role of cognitive explanations to ground out social phenomena in cognitive operations. The present study describes a preliminary simulation of social influence and conformity using two possible cognitive mechanisms: the first a homophily-based model that weighs belief updating based on generating a latent trust magnitude, and the second is a novel similarity-learning mechanism that weighs memory retrieval via similarity. While the homophily model was able to capture both influence and conformity effects based on degree of initial strength in the belief and crystallization of the belief, the similarity-based model always conformed. Both models exhibited initial learning and larger belief updating while settling to a relatively-stable state over time. Future implications for modeling influence via cognitive factors are discussed.
This paper provides a novel graphical Bond Graph teaching method to benefit the education quality in mechatronics engineering. Mechatronics engineering is considered an interdisciplinary subject since it involves mech...
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ISBN:
(纸本)9798350385236;9798350385243
This paper provides a novel graphical Bond Graph teaching method to benefit the education quality in mechatronics engineering. Mechatronics engineering is considered an interdisciplinary subject since it involves mechanical, electronics, and control theory. Traditional control engineering focuses on dynamic mathematics modeling, such as state-space and ordinary differential equations, which makes it difficult to understand the subjects' concepts during education. This paper proposes the Bond Graph as a native language for mechatronics engineering students, which can reach the same result as the traditional transfer function and state space methods with slight differences in modeling concepts. The Bond Graph also has a synergy property by representing multiple domains using the same toolset language. The Bond Graph as a Dataflow program helps students digest the complexity of the concept because of its modular characteristics. The Bond Graph provides convenience in mechatronics engineering education from a pure graphical modeling method.
Optical interconnects require compact, high-speed, low-power optical transceivers with hybrid integration of silicon photonic devices and electronic circuits. Electro-optic co-simulation is necessary for the design of...
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ISBN:
(纸本)9798350347401
Optical interconnects require compact, high-speed, low-power optical transceivers with hybrid integration of silicon photonic devices and electronic circuits. Electro-optic co-simulation is necessary for the design of such transceivers. The accuracy of photonic device models is still insufficient for high-frequency circuit design. This paper proposes an accurate model for Si rib waveguide and photonic crystal waveguide (PCW) Mach-Zehnder optical modulators, which includes high-frequency losses in the electrodes and the slow light effect of the PCW phase shifter. The operation of the optical device was described in Verilog-A which is compatible with the circuit design platform. The accuracy of the developed model was verified by S-parameter analysis and transient analysis with Keysight's Advanced Design System circuit simulator. The simulation results agreed well with the measurements up to 64 Gbaud.
The damaging socio-economic impact of cascading failures leading to blackout justifies the paramount importance of their risk assessment. Static cascading outage risk assessment methods remain the predominant approach...
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ISBN:
(纸本)9798350386509;9798350386493
The damaging socio-economic impact of cascading failures leading to blackout justifies the paramount importance of their risk assessment. Static cascading outage risk assessment methods remain the predominant approach for simulating cascading outages. However, they still require major refinement, particularly in the modeling of one of the main aspects of cascade outage simulation, i.e. under-voltage load shedding (UVLS), as well as its significant related limitation, i.e. the lack of a realistic solution when encountering divergence of AC power flow (AC PF). In this paper, a new static method is proposed for risk assessment of cascading outages. In addition to common features like modeling of system reaction to frequency deviation, the paper mainly focuses on the modeling of UVLS. To achieve this, the proposed method leverages an extended AC power flow-based (EPF) approach, combined with short-term load characteristics to replicate the system trajectory accurately, identifying the precise moment when UVLS becomes necessary. Moreover, the method ensures that UVLS is executed seamlessly, without encountering divergence in the AC power flow calculations. Tests conducted on the ieee 39-bus system demonstrate that the proposed method can offer a more precise assessment of the risk associated with cascading outages.
For the problem of co-frequency interference between Geostationary Orbit (GSO) and Non-Geostationary Orbit (NGSO) systems, the simulation standard of interference between NGSO and GSO satellite systems has been invest...
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ISBN:
(纸本)9798350378412
For the problem of co-frequency interference between Geostationary Orbit (GSO) and Non-Geostationary Orbit (NGSO) systems, the simulation standard of interference between NGSO and GSO satellite systems has been investigated alongside the simulation flow of traditional orbit extrapolation methods. To analyze spectral changes in interference values between these systems across varying step sizes, mathematical models for NGSO and GSO system interference under the same frequency have been established using the Nyquist sampling theorem. Subsequently, a feature extraction method has been devised to accurately extract time parameters in simulation scenarios of same-frequency system interference based on orbit extrapolation methods. To validate this method, simulation scenarios of co-frequency interference between GSO and NGSO systems were constructed and executed through computer computation. The simulation results demonstrate the effectiveness of the proposed feature extraction method in precisely extracting time parameters. Therefore, beyond enhancing simulation accuracy, its application holds significance for parameter selection in the analysis, modeling, and simulation of NGSO and GSO co-frequency interference.
Crowd simulation algorithms based on the social force model are widely used to simulate the movement behavior of real crowds due to their realism and flexibility. However, when modeling the behavior of high-density cr...
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ISBN:
(纸本)9798350386783;9798350386776
Crowd simulation algorithms based on the social force model are widely used to simulate the movement behavior of real crowds due to their realism and flexibility. However, when modeling the behavior of high-density crowds, the interacting forces between individuals become extraordinarily complex, which leads to individual pedestrians being prone to jerks and local abnormal behavior. To address this problem, this paper proposes a crowd simulation algorithm that combines a social force model and a consistency algorithm to constrain the pedestrians as a whole through the consistency algorithm and eliminate possible local abnormal behaviors. Ultimately, the efficacy of our algorithm was corroborated through a series of self-organizing simulation experiments.
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