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Cellular automata model for simulation of effect of guiders and visibility range
Weifeng Yuan,Kang Hai Tan 한국물리학회 2009 Current Applied Physics Vol.9 No.5
An extensive cellular automata (CA) model is proposed to simulate evacuations from a large smoke-filled compartment. To be more realistic, the proposed CA model takes account of human behavior by probabilistic analysis. In the numerical tests, the phenomenon of ‘‘flow with the stream” is simulated. The results show that visibility and number of guiders can affect an evacuation significantly. By using the proposed model, these two effects can be simulated through case study.
Modeling of progressive collapse of a multi-storey structure using a spring-mass-damper system
Yuan, Weifeng,Tan, Kang Hai Techno-Press 2011 Structural Engineering and Mechanics, An Int'l Jou Vol.37 No.1
A simple mechanical model is proposed to demonstrate qualitatively the pancake progressive collapse of multi-storey structures. The impact between two collapsed storeys is simulated using a simple algorithm that builds on virtual mass-spring-damper system. To analyze various collapse modes, columns and beams are considered separately. Parametric studies show that the process of progressive collapse involves a large number of complex mechanisms. However, the proposed model provides a simple numerical tool to assess the overall behavior of collapse arising from a few initiating causes. Unique features, such as beam-to-beam connection failure criterion, and beam-to-column connection failure criterion are incorporated into the program. Besides, the criterion of local failure of structural members can also be easily incorporated into the proposed model.
A superelement formulation for efficient structural analysis in progressive collapse
Long, Xu,Yuan, Weifeng,Tan, Kang Hai,Lee, Chi King Techno-Press 2013 Structural Engineering and Mechanics, An Int'l Jou Vol.48 No.3
An integrated superelement concept is proposed to improve the computational efficiency when analyzing structural responses during progressive collapses of large-scale structures, such as multi-storey reinforced concrete buildings. While the proposed methodology is straightforward and can be implemented into an existing finite element program with little effort, it is able to significantly reduce the computational cost without the loss of any critical information of the structural responses. Compared with the models without superelement, significant saving in computational cost and satisfactory prediction accuracy can be obtained with the proposed approach.
A superelement formulation for efficient structural analysis in progressive collapse
Xu Long,Weifeng Yuan,Kang Hai Tan,Chi King Lee 국제구조공학회 2013 Structural Engineering and Mechanics, An Int'l Jou Vol.48 No.3
An integrated superelement concept is proposed to improve the computational efficiency when analyzing structural responses during progressive collapses of large-scale structures, such as multi-storey reinforced concrete buildings. While the proposed methodology is straightforward and can be implemented into an existing finite element program with little effort, it is able to significantly reduce the computational cost without the loss of any critical information of the structural responses. Compared with the models without superelement, significant saving in computational cost and satisfactory prediction accuracy can be obtained with the proposed approach.
Jing Ye,Yuan Yang,Weifeng Wan,Xuntai Ma,Lei Liu,Yong Liu,Zhongchun He,Zhengzhou Yuan 대한신경외과학회 2023 Journal of Korean neurosurgical society Vol.66 No.6
Nephrotic syndrome (NS) is associated with cerebral venous sinus thrombosis (CVST), which is a rare cerebrovascular disorder in children. Systemic anticoagulation with heparin is the standard therapy for CVST, and mechanical thrombectomy (MT) has been described as a salvage treatment for adult anticoagulant refractory CVST, However, it has never been reported in children. We describe a case of MT for refractory CVST in a child with NS. A 13-year-old boy with newly diagnosed NS presented to an emergency department with acute headache. A head computed tomography showed acute thrombus in the superior sagittal sinus, straight sinus and transverse sinus. The child was started on heparin therapy, but clinically deteriorated and became unresponsive. In view of the rapid deterioration of the condition after anticoagulation treatment, the patient received intravascular treatment. Several endovascular technologies, such as stent retriever and large bore suction catheter have been adopted. After endovascular treatment, the patient’s neurological condition was improved within 24 hours, and magnetic resonance venography of the head demonstrated that the CVST was reduced. The child recovered with normal neurological function at discharge. This case highlights the importance of considering MT for refractory CVST, and we suggest that MT may be considered for refractory CVST with NS in children.