The present paper deals with the average case complexity of the shift—invariant problem. The main aim is to give a new proof of the upper bound of average error of finite element method. Our method is based on the te...The present paper deals with the average case complexity of the shift—invariant problem. The main aim is to give a new proof of the upper bound of average error of finite element method. Our method is based on the techniques proposed by Heinrich (1990). We also point out an essential error regarding the proof of the upper bound in A. G. Werschulz (1991).展开更多
BACKGROUND Cases of esophageal,airway,and pericardial perforations caused by chicken bone ingestion are rare worldwide,but their incidence has shown an upward trend in recent years.Injuries caused by chicken bones are...BACKGROUND Cases of esophageal,airway,and pericardial perforations caused by chicken bone ingestion are rare worldwide,but their incidence has shown an upward trend in recent years.Injuries caused by chicken bones are often more severe,leading to infections and,in extreme cases,perforation of the common carotid artery,pericardium,trachea,or even the heart,posing life-threatening risks.CASE SUMMARY We present a case of a patient who sustained combined esophageal and pericardial injuries with subsequent pericardial effusion due to chicken bone ingestion.The clinical manifestations included chest pain and widespread ST-segment elevation on electrocardiography.CONCLUSION The patient’s symptoms and signs were not entirely consistent with myocardial infarction.Chest computed tomography played a crucial role in clarifying the etiology and provided critical evidence for devising an effective treatment strategy.展开更多
文摘The present paper deals with the average case complexity of the shift—invariant problem. The main aim is to give a new proof of the upper bound of average error of finite element method. Our method is based on the techniques proposed by Heinrich (1990). We also point out an essential error regarding the proof of the upper bound in A. G. Werschulz (1991).
文摘BACKGROUND Cases of esophageal,airway,and pericardial perforations caused by chicken bone ingestion are rare worldwide,but their incidence has shown an upward trend in recent years.Injuries caused by chicken bones are often more severe,leading to infections and,in extreme cases,perforation of the common carotid artery,pericardium,trachea,or even the heart,posing life-threatening risks.CASE SUMMARY We present a case of a patient who sustained combined esophageal and pericardial injuries with subsequent pericardial effusion due to chicken bone ingestion.The clinical manifestations included chest pain and widespread ST-segment elevation on electrocardiography.CONCLUSION The patient’s symptoms and signs were not entirely consistent with myocardial infarction.Chest computed tomography played a crucial role in clarifying the etiology and provided critical evidence for devising an effective treatment strategy.
