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Overview of finite elements simulation of temperature profile to estimate properties of materials 3D-printed by laser powder-bed fusion

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Chinese Physics B 2020年第4期29卷 98-109页

作者： Habimana Jean Willy Xinwei Li Yong Hao Tan Zhe Chen Mehmet Cagirici Ramadan Borayek Tun Seng Herng chun yee aaron ong Chaojiang Li Jun Ding Department of Materials Science and Engineering Faculty of EngineeringNational University of Singapore9 Engineering Drive 1Singapore 117576Singapore

Laser powder bed fusion(LPBF),like many other additive manufacturing techniques,offers flexibility in design expected to become a disruption to the manufacturing *** current cost of LPBF process does not favor a try-anderror way of research,which makes modelling and simulation a field of superior importance in that area of *** this work,various methods used to overcome challenges in modeling at different levels of approximation of LPBF process are *** efforts made towards a reliable and computationally effective model to simulate LPBF process using finite element(FE)codes are presented.A combination of ray-tracing technique,the solution of the radiation transfer equation and absorption measurements has been used to establish an analytical equation,which gives a more accurate approximation of laser energy deposition in powder-substrate *** this new analytical energy deposition model is used in in FE simulation,with other physics carefully set,it enables us to get reliable cooling curves and melt track morphology that agree well with experimental *** use of more computationally effective approximation,without explicit topological changes,allows to simulate wider geometries and longer scanning time leading to many applications in real engineering *** applications are herein presented including:prediction of printing quality through the simulated overlapping of consecutive melt tracks,simulation of LPBF of a mixture of materials and estimation of martensite inclusion in printed steel.

关键词： selective laser melting powder bed fusion finite element modeling laser absorption

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Lateral displacement of soft ground under vacuum pressure and surcharge load

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Frontiers of Structural and Civil Engineering 2011年第2期5卷 239-248页

作者： Chin-yee ong Jin-chun CHAI Department of Civil Engineering and Architecture Saga UniversitySaga 840-8502Japan

Surcharge load(*** fill)will induce settlement and outward lateral displacement,while vacuum pressure will induce settlement and inward lateral displacement of a ***,combination of surcharge load and vacuum pressure can reduce or minimize the lateral *** large scale model(length:1.50 m,width:~0.62 m,height:0.85 m)tests and finite element analyses(FEA)were conducted to investigate the main influencing factors on lateral displacement of a soft clayey ground under the combination of vacuum pressure and surcharge *** the conditions investigated,the results indicate that the outward lateral displacement increases with the increase of the ratio of surcharge load to vacuum pressure(RL)and the loading rate of the surcharge load(LR).Also,it is shown that for a given RL and LR condition,lateral displacement reduces with the increase of the initial undrained shear strength(Su)of the *** predict the lateral displacement of a ground under the combination of surcharge load and vacuum pressure,the loading conditions in terms of RL and LR,and Su value of the ground have to be considered.

关键词： vacuum consolidation lateral displacement PVD finite element analysis surcharge load

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Quality indicators in pediatric colonoscopy in a low-volume center:Implications for training

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World Journal of Gastroenterology 2018年第9期24卷 1013-1021页

作者： Way-Seah Lee chun-Wei Tee Zhong-Lin Koay Tat-Seng Wong Fatimah Zahraq Hee-Wei Foo Sik-Yong ong Shin-yee Wong Ruey-Terng Ng Department of Paediatrics University Malaya Medical CentreKuala Lumpur 59100Malaysia Paediatric and Child Health Research Group University MalayaKuala Lumpur 50603Malaysia

AIM To study implications of measuring quality indicators on training and trainees' performance in pediatric colonoscopy in a low-volume training *** We reviewed retrospectively the performance of pediatric colonoscopies in a training center in Malaysia over 5 years(January 2010-December 2015), benchmarked against five quality indicators: appropriateness of indications, bowel preparations, cecum and ileal examination rates, and complications. The European Society of Gastrointestinal Endoscopy guideline for pediatric endoscopy and North American Society for Pediatric Gastroenterology, Hepatology and Nutrition training guidelines were used as *** Median(± SD) age of 121 children [males = 74(61.2%)] who had 177 colonoscopies was 7.0(± 4.6) years. On average, 30 colonoscopies were performed each year(range: 19-58). Except for investigations of abdominal pain(21/177, 17%), indications for colonoscopies were appropriate in the remaining 83%. Bowel preparation was good in 87%. One patient(0.6%) with severe Crohn's disease had bowel perforation. Cecum examination and ileal intubation rate was 95% and 68.1%. Ileal intubation rate was significantly higher in diagnosing or assessing inflammatory bowel disease(IBD) than non-IBD(72.9% vs 50.0%; P = 0.016). Performance of four trainees was consistent throughout the study period. Average cecum and ileal examination rate among trainees were 97% and 77%.CONCLUSION Benchmarking against established guidelines helps units with a low-volume of colonoscopies to identify area for further improvement.

关键词： Pediatric colonoscopies Quality indicators Performance

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Performance in the Fundamentals of Laparoscopic Surgery: Does it reflect global rating scales in the Objective Structured Assessment of Technical Skills in porcine laparoscopic surgery?

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Asian Journal of Urology 2024年第3期11卷 443-449页

作者： Ho yee Tiong Wei Zheng So Jeremy Yuen-chun Teoh Shuji Isotani Gang Zhu Teng Aik ong Eddie Shu-Yin Chan Peggy Sau-Kwan Chu Kittinut Kijvikai Ming Liu Bannakji Lojanapiwat Michael Wong Anthony Chi-Fai Ng Yong Loo Lin School of Medicine Department of SurgeryNational University of SingaporeSingapore S.H.Ho Urology Centre Department of SurgeryThe Chinese University of Hong KongHong KongChina Department of Urology Juntendo University Graduate School of MedicineTokyoJapan Department of Urology National University HospitalSingapore Department of Urology Beijing United Family HospitalBeijingChina Department of Surgery University of Malaya Specialist CentreKuala LumpurMalaysia Division of Urology Department of SurgeryTuen Mun HospitalHong Kong Department of Urology Ramathibodi HospitalMahidol UniversitySalayaThailand Department of Urology Beijing HospitalBeijingChina Department of Urology Chiangmai Ram HospitalChiang MaiThailand International Urology Fertility&Gynaecology CentreSingapore

Objective:To correlate the utility of the Fundamentals of Laparoscopic Surgery(FLS)manual skills program with the Objective Structured Assessment of Technical Skills(OSATS)global rating scale in evaluating operative ***:The Asian Urological Surgery Training and Educational Group(AUSTEG)Laparoscopic Upper Tract Surgery Course implemented and validated the FLS program for its usage in laparoscopic surgical ***’basic laparoscopic skills were assessed using three different training models(peg transfer,precision cutting,and intra-corporeal suturing).They also performed live porcine laparoscopic surgery at the same *** surgery skills were assessed by blinded faculty using the OSATS rating ***:From March 2016 to March 2019,a total of 81 certified urologists participated in the course,with a median of 5 years of post-residency *** differences in task time did not reach statistical significance,those with more surgical experience were visibly faster at completing the peg transfer and intra-corporeal suturing FLS ***,they took longer to complete the precision cutting task than participants with less *** OSATS scores correlated weakly with all three FLS tasks(peg transfer time:r=0.331,r^(2)=0.110;precision cutting time:r=0.240,r^(2)=0.058;suturing with intracorporeal knot time:r=0.451,r^(2)=0.203).Conclusion:FLS task parameters did not correlate strongly with OSATS globing rating scale *** FLS task models demonstrated strong validity,it is important to assimilate the inconsistencies when benchmarking technical proficiency against real-life operative competence,as evaluated by FLS and OSATS,respectively.

关键词： The Fundamentals of Laparoscopic Surgery Assessment of Technical Skills Laparoscopic training Surgical education Surgical training Urological laparoscopic surgery

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A novel mortality risk score for emphysematous pyelonephritis:A multicenter study of the Global Research in the Emphysematous Pyelonephritis group

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Current Urology 2024年第1期18卷 55-60页

作者： Hegel Trujillo-Santamaría José Iván Robles-Torres Jeremy Yuen-chun Teoh Yiloren Tanidir José Gadú Campos-Salcedo Edgar Iván Bravo-Castro Marcelo Langer Wroclawski W.S.Yeoh Santosh Kumar Juan Eduardo Sanchez-Nuñez José Enrique Espinoza-Aznar Deepak Ragoori Saeed Bin Hamri ong Teng Aik Cecil Paul Tarot-Chocooj Anil Shrestha Mohamed Amine Lakmichi Mateus Cosentino-Bellote Luis Gabriel Vázquez-Lavista Boukary Kabre Ho yee Tiong José Gustavo Arrambide-Herrera Lauro Salvador Gómez-Guerra Umut Kutukoglu Joao Arthur Brunhara Alves-Barbosa Jorge Jaspersen Christian Acevedo Francisco Virgen-Gutiérrez Sumit Agrawal Hugo Octaviano Duarte-Santos Chai Chu Ann Daniele Castellani Vineet Gahuar Department of Urology Hospital CovadongaCórdobaMéxico Department of Urology Hospital Universitario"Dr.José Eleuterio Gonzalez"MonterreyMéxico Department of Surgery S.H.Ho Urology CentrePrince of Wales HospitalThe Chinese University of Hong KongHong KongChina Department of Urology Marmara University School of MedicineIstanbulTurkey Department of Urology Hospital Central MilitarMéxico CityMéxico Department of Urology Hospital Israelita Albert EinsteinBP-a Beneficência Portuguesa de Sao PauloSao PauloBrazil Faculdade de Medicina do ABC Santo AndréBrazil Department of Urology University Surgical ClusterNational University HospitalSingaporeSingapore Department Urology Christian Medical CollegeVelloreTamilnadIndia Department Urology Hospital General de México"Dr.Eduardo Liceaga"México CityMéxico Department of Urology Hospital Regional de Alta Especialidad de la Peninsula de YucatánMéridaMéxico Department Urology Asian Institute of Nephrology and UrologyHyderabadIndia Department Urology King Abdulaziz National Guard HospitalRiyadhSaudi Arabia Division of Urology Department of SurgeryUniversity of MalayaKuala LumpurMalaysia Department of Urology Central Military HospitalMexico CityMexico National Academy of Medical Sciences Bir Hospital and B&B HospitalGwarko LalitpurNepal Department of Urology University Hospital Mohammed theⅥ^(th)of MarrakeshMarrakeshMorocco Department of Urology Federal University of ParanáSchool of MedicineHospital das ClínicasCuritibaBrazil Department of Urology Hospital Médica SurMexico CityMexico Department of Urology Hospital Yalgado Ouedraogo OuagadougaKadiogoBurkina Faso Department of Urology Hospital Das Clínicas da Universidade de Sao PauloSao PauloBrazil Department of Urology AIIMSBhubaneshwarIndia Department of Urology Hospital Municipal Dr.Moysés Deutsch(M'Boi Mirim)Sao PauloBrazil Department of Urology Azienda Ospedaliero-Universitaria Ospedali Riuniti di AnconaPolytechnic University of Le Marche RegionAnconaItaly Department of Minim

Background:Emphysematous pyelonephritis(EPN)is a necrotizing infection of the kidney and the surrounding tissues associated with considerable *** aimed to formulate a score that classifies the risk of mortality in patients with EPN at hospital *** and methods:Patients diagnosed with EPN between 2013 and 2020 were retrospectively *** from 15 centers(70%)were used to develop the scoring system,and data from 7 centers(30%)were used to validate *** and mułtivariable logistic regression analyses were performed to identify independent factors related to *** operating characteristic curve analysis was performed to construct the sconng system and calculate the risk of mortality.A standardized regression coefficient was used to quantify the discriminating power of each factor to convert the individual coefficients into *** area under the curve was used to quantify the scoring system *** 8-point scoring system for the mortality risk was created(range,0-7).Results:In total,570 patients were included(400 in the test group and 170 in the validation group).Independent predictors of mortality in the multivariable logistic regression were included in the scoring system:quick Sepsis-related Organ Failure Assessment score≥2(2 points),anemia,paranephric gas extension,leukocyte count>22,000/pL,thrombocytopenia,and hyperglycemia(1 point each).The mortality rate was<5%for scores≤3,83.3%for scores 6,and 100%for scores *** area under the Curve was 0.90(95%confidence interval,0.84-0.95)for test and 0.91(95%confidence interval,0.84-0.97)for the validation ***:Our score predicts the risk of mortality in patients with EPN at presentation and may help clinicians identify patients at a higher risk of death.

关键词： Emphysematous pyelonephritis Mortality Prognosis

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