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Journal of Zhejiang University SCIENCE B

ISSN 1673-1581(Print), 1862-1783(Online), Monthly

Perforation of the esophagus: an overlooked cause of chest pain as a complication of esophageal foreign bodies

Abstract: Chest pain is one of the most common complaints in the emergency department. Diseases of the heart, aorta, lungs, esophagus, stomach, mediastinum, pleura, and abdominal viscera can all cause chest discomfort (Gulati et al., 2021; Jiao et al., 2021; Lu et al., 2022). Clinicians in the emergency department are expected to immediately recognize life-threatening chest pain (Jiao et al., 2021). Delayed diagnosis further increases the risk of complications and mortality (Liu et al., 2021). In this case, we present an elderly Chinese female who had a history of myocardial infarction two years previously, with chest pain eventually found to be caused by ingestion of a duck bone.

Key words: Chest pain; Esophageal foreign body; Esophageal perforation

Chinese Summary  <34> 通过延时反馈法对实角汽车跟驰模型进行分叉控制

作者:季群1,吕浩1,杨航1,魏麒2,程荣军1
机构:1宁波大学,海运学院,中国宁波,315211;2宁波财经学院,中国宁波,315175
目的:随着城市化进程的不断发展,交通事故和交通拥堵越来越成为城市发展的障碍。本文旨在设计一种响应延迟反馈控制来抑制不稳定因素引起的分岔,从而抑制交通流量振荡并提高模型对车辆轨迹的拟合程度。
创新点:1.采用定积分方法来确定反应延迟和反馈增益的稳定区间;2.设计一种抑制交通拥堵和稳定交通流量的控制策略。
方法:1.通过对线性分析和分岔分析的比较,确定稳定区的临界范围;2.运用定积分的方法模拟各参数联合控制下的精确和稳定范围;3.通过校准得到的最优反馈增益和时滞参数位于控制系统的稳定区域,从而验证该控制系统的合理性和可行性。
结论:1.本文设计的响应延迟反馈控制系统可以用来抑制或削弱交通系统的分岔,从而抑制交通拥堵;2.校准得到的最优反馈增益和时滞参数位于控制系统的稳定区域;3.合理的反馈增益和延迟设置可以有效地提高交通流量的稳定性。

关键词组:视角模型;时延;Hopf分岔;反馈控制;参数校准


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DOI:

10.1631/jzus.B2300026

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On-line Access:

2023-05-15

Received:

2023-01-09

Revision Accepted:

2023-03-19

Crosschecked:

2023-05-16

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