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Comparison of Structural Probabilistic and Non-Probabilistic Reliability Computational Methods under Big Data Condition

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Structural Durability & Health Monitoring 2022年第2期16卷 129-143页

作者： Yongfeng Fang kong fah tee School of Physics and Electronic Information Engineering Ningxia Normal UniversityGuyuan756000China School of Engineering University of GreenwichKentME44TBUK School of Mechanical Engineering Guizhou University of Engineering ScienceBijie551700China

In this article,structural probabilistic and non-probabilistic reliability have been evaluated and compared under big data ***,the big data is collected via structural monitoring and *** data is classified into different types according to the regularities of the distribution of *** different stresses which have been subjected by the structure are used in this ***,the structural interval reliability and probabilistic pre-diction models are established by using the stress-strength interference theory under big data of random loads after the stresses and structural strength are comprehensively *** reliability is computed by using various stress types,and the minimum reliability is determined as structural ***,the advan-tage and disadvantage of the interval reliability method and probability reliability method are shown by using three *** has been shown that the proposed methods are feasible and effective.

关键词： Big data structure interval reliability probabilistic reliability reliability index

Finite Element Model Updating for Structural Health Monitoring

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Structural Durability & Health Monitoring 2020年第1期14卷 1-17页

作者： Amirabbas Haidarpour kong fah tee School of Engineering University of GreenwichChatham MaritimeKentME44TBUK

This paper provides a model updating approach to detect,locate,and char-acterize damage in structural and mechanical systems by examining changes in mea-sured vibration *** in vibration-based damage identification has been rapidly expanding over the last few *** basic idea behind this technology is that modal parameters(notably frequencies,mode shapes,and modal damping)are functions of the physical properties of the structure(mass,damping,and sifies).Therefore,changes in the physical properties will cause changes in the modal proper-ties which could be obtained by structural health monitoring(SHM).Updating is a process fraught with numerical *** arise from inaccuracy in the model and imprecision and lack of information in the measurements,mainly taken place in joints and critical *** motivation for the development of this technology ***,methods are categorized according to various criteria such as the level of damage detection provided from vibration testing,natural frequency and mode shape readings are then obtained by using modal analysis techniques,which are used for updating structural parameters of the associated finite element model The experi-mental studies for the laboratory tested bridge model show that the proposed *** using ME scope technique can provide reasonable model updating results.

关键词： Structural health monitoring model updating natural frequency mode shape stiffness vibration testing

Extraction of real modes and physical matrices from modal testing

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Earthquake Engineering and Engineering Vibration 2011年第2期10卷 219-227页

作者： Wang Tong Zhang Lingmi tee kong fah MOE Key Lab of Structural Mechanics and Control for Aircraft Nanjing University of Aeronautics and Astronautics Nanjing 210016 China Department of Civil Engineering University of Greenwich United Kingdom

A technique to extract real modes from the identified complex modes is presented in this paper, which enables the normalized real mode shapes, modal masses, and full or reduced mass and stiffness matrices to be obtained. The theoretical derivation of the method is provided in detail. An 11-DOF vibration system is used to validate the algorithm, and to analyze the effects of the number of modes utilized and measurement DOFs on the extraction results. Finally, the method is used to extract real modes from both experimental modal analysis and operational modal analysis.

关键词： modal analysis complex mode real mode normalized mode shape modal mass

Esophageal rupture due to Sengstaken-Blakemore tube misplacement

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World Journal of Gastroenterology 2005年第41期11卷 6563-6565页

作者： Chee-fah Chong Emergency Department Shin-kong Wu Ho-Su Memorial Hospital TaipeiTaiwanChina

The author presents three cases of esophageal rupture during the treatment of massive esophageal variceal bleeding with Sengstaken-Blakemore (SB) tube. In each case, simple auscultation was used to guide SB tube insertion, with chest radiograph obtained only after complete inflation of the gastric balloon. Two patients died of hemorrhagic shock and one died of *** author suggests that confirmation of SB tube placement by auscultation alone may not be *** chest radiographs should be obtained before and after full inflation of the gastric balloon to confirm tube position and to detect tube dislocation.

关键词： Chest radiograph Esophageal rupture Sengstaken-Blakemore tube

Continuing to Build a Life-Long Friendship: Canada and China

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Voice of Friendship 2006年第1期 49-50,52页

作者： kong fah Lee Former President of the Montreal Canada-China Society

The People’s Republic of Chi- na’s President Hu Jintao’s recent visit to Canada, coincided with the 35th anniversary of the Testablishment of diplomatic rela- tion between Canada and China. We are optimistic that h... 详细信息

关键词： Canada diplomatic visitors Pavilion friend coopera

基于对比增强经颅多普勒的多模式超声评估卵圆孔未闭相关右向左分流的临床意义

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中华医学超声杂志（电子版） 2024年第4期21卷 345-351页

作者：孔莹惠品晶丁亚芳周炳元苏州大学附属第一医院神经外科-颈脑血管超声科 215006 苏州大学附属第一医院心内科心超室 215006

目的研究对比增强经颅多普勒(c-TCD)与经食管超声心动图声学造影(c-tee)评估卵圆孔未闭(PFO)相关右向左分流(RLS)的临床意义。方法回顾性连续纳入2020年1月至2022年6月在苏州大学附属第一医院因头晕、晕厥、偏头痛、缺血性卒中或短暂性... 详细信息

目的研究对比增强经颅多普勒(c-TCD)与经食管超声心动图声学造影(c-tee)评估卵圆孔未闭(PFO)相关右向左分流(RLS)的临床意义。方法回顾性连续纳入2020年1月至2022年6月在苏州大学附属第一医院因头晕、晕厥、偏头痛、缺血性卒中或短暂性脑缺血发作(TIA)等临床表现就诊,临床可疑RLS的患者243例,所有患者均完成c-TCD、tee和c-tee检查。分析c-TCD、c-tee对PFO-RLS的检出结果。采用McNemar-Bowker检验比较c-TCD和c-tee对PFO-RLS的半定量分级;并分析c-TCD评估下PFO-RLS分流类型、分流等级及与PFO直径和隧道长度的关系。结果纳入的243例患者中,偏头痛及头晕、晕厥等占71.2%(173/243),缺血性卒中或TIA占28.8%(70/243)。以tee结合c-tee结果为参考标准,确诊232例PFO-RLS。c-TCD、c-tee对PFO-RLS的检出率均为99.1%(230/232)。c-TCD检查:静息状态、传统Valsalva动作、定量Valsalva动作时,大量分流的检出率分别为20.7%(48/232)、41.4%(96/232)、67.7%(157/232),两两比较差异均有统计学意义(P均tee检查:静息状态、腹部加压下,小量分流的检出率分别为18.1%(42/232)、32.8%(76/232),中量分流的检出率分别为0.9%(2/232)、25.0%(58/232),大量分流的检出率分别为3.0%(7/232)、41.4%(96/232)。c-TCD与c-tee评估的PFO-RLS分流等级差异有统计学意义(Boweker检验值为51.524,Ptee检出率高于c-TCD(χ^(2)=5.222,P=0.022);中量分流,c-tee检出率高于c-TCD(χ^(2)=20.885,Ptee(χ^(2)=53.923,Ptee;55.6%(129/232)的患者c-TCD和c-tee评估的分流等级相同;9.5%(22/232)的患者分流等级c-TCD低于c-tee。c-TCD评估下固有型RLS的PFO直径大于潜在型RLS的PFO直径(P0.05)。PFO-RLS分流等级与PFO直径呈正相关(r=0.307,P0.05)。结论c-TCD是评估RLS的有效血流动力学依据,充分的Valsalva动作下c-TDC可为PFO-RLS提供可靠的半定量诊断结果,c-tee可明确RLS的来源,两者共同联合可为个体化诊断提供科学依据。

关键词：卵圆孔未闭右向左分流对比增强经颅多普勒经食管超声心动图

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裂解炉稀释蒸汽管道三通开裂原因分析

压力容器 2024年第7期41卷 56-62,86页

作者：陈静孔范洋许铁群陈怀宁中国科学院金属研究所沈阳110016 北方华锦化学工业股份有限公司辽宁盘锦124099

针对某乙烯裂解装置稀释蒸汽管道304H耐热不锈钢三通使用1年后发生开裂的情况,从材料成分、力学性能、金相组织、残余应力和断口特性等方面进行了分析。结果表明,裂纹分别启裂于三通的内壁和外壁,多数裂纹开裂处伴有晶间腐蚀特征,裂纹... 详细信息

针对某乙烯裂解装置稀释蒸汽管道304H耐热不锈钢三通使用1年后发生开裂的情况,从材料成分、力学性能、金相组织、残余应力和断口特性等方面进行了分析。结果表明,裂纹分别启裂于三通的内壁和外壁,多数裂纹开裂处伴有晶间腐蚀特征,裂纹扩展特性以沿晶型为主;断口附近腐蚀产物存在O,S,Cl等酸性腐蚀介质。三通主管表面最大轴向应力达到147 MPa,三通相贯线附近距裂纹20 mm处的最大环向应力达到114 MPa,说明运行中的三通表面应力达到了材料屈服强度的1/2。分析认为,裂纹的产生是由于材料发生敏化后,在应力和腐蚀介质共同作用下形成的以沿晶为主的应力腐蚀开裂,更换三通材料或通过适当的固溶处理降低三通中的残余应力是避免三通开裂的重要途径。

关键词：稀释蒸汽管道三通应力腐蚀开裂 304H不锈钢敏化

Passive harmonic mode locking of gain-guided solitons in erbium-doped fiber lasers

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Chinese Science Bulletin 2008年第5期53卷 676-680页

作者： ZHAO LuMing TANG DingYuan CHENG tee Hiang TAM Hwa-Yaw LU Chao School of Electrical and Electronic Engineering Nanyang Technological University 639798 Singapore Department of Electrical Engineering Hong Kong Polytechnic University Hong Kong China Department of Electronic and Information Engineering Hong Kong Polytechnic University Hong Kong China

We report the experimental observation of passive harmonic mode locking of gain-guided solitons in erbium-doped fiber lasers either made of purely normal dispersion fibers or operating in the net normal cavity dispersion regime. Harmonic-2 and harmonic-3 mode locking states of the gain-guided solitons with supermode suppression larger than 35 dB have been obtained.

关键词：铒掺杂光纤激光器孤波被动谐波振荡型同步正常色散

Development of annulus fibrosus tissue construct with hydrogel coils containing pre-conditioned mesenchymal stem cell

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Journal of Materials Science & Technology 2021年第4期63卷 27-34页

作者： Yon Jin Chuah Yingnan Wu Mei Ling Shirlynn Cheong Yan Qing Chia Ching Ann tee Hwan Tak Hee Chenjie Xu Yuejun Kang Dong-An Wang School of Chemical and Biomedical Engineering Nanyang Technological University62 Nanyang Drive637459Singapore Lee kong Chian School of Medicine Nanyang Technological University59 Nanyang Drive636921Singapore Pinnacle Spine&Scoliosis Centre 3 Mount ElizabethMount Elizabeth Medical Centre228510Singapore Faculty of Materials and Energy Institute for Clean Energy and Advanced MaterialsSouthwest UniversityChongqing 400715China Department of Biomedical Engineering City University of Hong Kong83 Tat Chee AvenueKowloonHong KongChina National Dental Centre of Singapore 5 Second Hospital Ave168938Singapore

Low back pain associated with degenerative disc diseases has been a major health concern that brings suffering to the patients physically and *** existing therapeutic strategies provide shortterm relief of symptoms rather than treatment of the underlying *** of an engineered tissue for disc regeneration is still in its infancy due to the limited autologous healthy disc cell source from the *** is also challenging to mimic the complexity of micro-architecture in the native disc tissue that determine their unique structural *** date,simple tissue models that mimic the annulus fibrosus(AF)micro-environment for understanding the potential of mesenchymal stem cells(MSCs)in AF tissue engineering are still *** this study,the assembly of a coiled hydrogel microfiber has shown its capability to encapsulate MSCs and create an engineered tissue model that mimics the multiple lamellae of native *** this model,we investigated the potential of MSCs that were previously induced by ascorbic acid(AA).Compared to non-induced MSCs,AA-induced MSCs exhibited significant increase in AF-associated biomarkers during later development in the engineered AF tissue model and also encouraged collagen accumulation through the down-regulated catabolic gene MMP1 and upregulated anti-catabolic gene ***,AA-induced MSCs exhibited a Col2/Col1 ratio closer to that of a native AF *** results suggested that AA-induced MSCs could be a potential cell source for AF tissue engineering and this established tissue model may provide a simple tool for successful AF tissue engineering strategies in the future.

关键词： closer stem strategies