Hierarchical remeshing strategies with mesh mapping for topology optimisation

This work investigates the use of hierarchical mesh decomposition strategies for topology optimisation using bi-directional evolutionary structural optimisation algorithm. The proposed method uses a dual mesh system that decouples the design variables from the finite element analysis mesh. The investigation focuses on previously unexplored areas of these techniques to investigate the effect of five meshing parameters on the analysis solving time (i.e. computational effort) and the analysis quality (i.e. solution optimality). The foreground mesh parameters, including adjacency ratio and minimum and maximum element size, were varied independently across solid and void domain regions. Within the topology optimisation, strategies for controlling the mesh parameters were investigated. The differing effects of these parameters on the efficiency and efficacy of the analysis and optimisation stages are discussed, and recommendations are made for parameter combinations. Some of the key findings were that increasing the adjacency ratio increased the efficiency only modestly – the largest effect was for the minimum and maximum element size parameters – and that the most dramatic reduction in solve time can be achieved by not setting the minimum element size too low, assuming mapping onto a background mesh with a minimum element size of 1

Evaluation of timed barium esophagram after per-oral endoscopic myotomy to predict clinical response

Background and study aims: The aim of this study was to evaluate whether timed barium esophagram within 24 hours post-per-oral endoscopic myotomy (POEM) (TBE-PP) could predict clinical outcomes. Patients and methods: This was a single-center retrospective study of prospectively collected data on consecutive patients with ≥ 6-month follow-up who underwent POEM followed by TBE-PP. Esophageal contrast retention 2 minutes after TBE-PP was assessed as Grade 1 ( 90 %). Eckardt score, esophagogastroduodenoscopy (EGD), high-resolution manometry (HRM) and function lumen imaging probe (FLIP) of the esophagogastric junction (EGJ) were obtained at baseline. These tests along with pH testing of antisecretory therapy were repeated 6 and 24 months after POEM. Clinical response by Eckardt score ≤ 3, EGJ-distensibility index (EGJ-DI) > 2.8 mm 2 /mm Hg, and integrated relaxation pressure (IRP) < 15 mm Hg and incidence of gastroesophageal reflux disease (GERD) were compared by transit time. Results: Of 181 patients (58 % male, mean 53 ± 17 yr), TBE-PP was classified as Grade 1 in 122 (67.4 %), Grade 2 in 41 (22.7 %), Grade 3 in 14 (7.7 %) and Grade 4 in 4 (2.2 %). At 6 months, overall clinical response by ES (91.7 %), IRP (86.6 %), EGJ-DI (95.7 %) and the diagnosis of GERD (68.6 %) was similar between Grade 1 and Grade 2-4 TBE-PP. At 24 months, Grade 1 had a higher frequency of a normal IRP compared to Grades 2-4 (95.7 % vs. 60 %, P = 0.021) but overall response by ES (91.2 %), EGJ-DI (92.3 %) and the diagnosis of GERD (74.3 %) were similar. Conclusions: Contrast emptying rate by esophagram after POEM has limited utility to predict clinical response or risk of post-procedure GERD

Optimization of directional elastic energy propagation

The aim of this paper is to demonstrate how topology optimization can be used to design a periodically perforated plate, in order to obtain a tailored anisotropic group velocity profile. The main method is demonstrated on both low and high frequency bending wave propagation in an aluminum plate, but is general in the sense that it could be used to design periodic structures with frequency dependent group velocity profiles for any kind of elastic wave propagation. With the proposed method the resulting design is manufacturable. Measurements on an optimized design compare excellently with the numerical results. (C) 2016 Elsevier Ltd. All rights reserved

MJERENJE PERFORMANSI VIŠEPROCESORKOG SUSTAVA U STVARNOJ OKOLINI

Kada govorimo o računalima i operacijskim sustavima često se postavlja pitanje performansi odnosno koji operacijski sustav radi brže i bolje. Svrha ovog rada je pokušati objasniti, izračunati i vizualno prikazati korištenje resursa u dva najpoznatija Microsoft-ova proizvoda: Windows XP koji je napravio revoluciju u Windows svijetu i Windows 7 koji glasi kao dostojni nasljednik te titule. Mjerenja će se obavljati na aplikaciji koja koristi sistemske tablice Windows sustava kako bi se mogla izračunati opterećenja samih procesorskih jedinica. U nastavku rada ću biti prikazano koji je sustav brži, a koji radi bolje prilikom korištenja procesora na temelju samog sustava i opterećenja aplikacijama.When we talk about computers and operating systems ti often raises the question of performance or which operating system runs faster and better. The purpose of this paper is to try to explain, calculate and visually display the use of resources in two of the most famous Microsoft's products: Windows XP, which has made a revolution in the world of Windows and Windows 7, which reads like a worthy successor to the title. Measurements will be made on an application that uses Windows system tables in order to calculate the usage of processor units. Which system is faster, which works better with regard to the use of processors based on the system and applications will be covered in the paper

MJERENJE PERFORMANSI VIŠEPROCESORKOG SUSTAVA U STVARNOJ OKOLINI

Kada govorimo o računalima i operacijskim sustavima često se postavlja pitanje performansi odnosno koji operacijski sustav radi brže i bolje. Svrha ovog rada je pokušati objasniti, izračunati i vizualno prikazati korištenje resursa u dva najpoznatija Microsoft-ova proizvoda: Windows XP koji je napravio revoluciju u Windows svijetu i Windows 7 koji glasi kao dostojni nasljednik te titule. Mjerenja će se obavljati na aplikaciji koja koristi sistemske tablice Windows sustava kako bi se mogla izračunati opterećenja samih procesorskih jedinica. U nastavku rada ću biti prikazano koji je sustav brži, a koji radi bolje prilikom korištenja procesora na temelju samog sustava i opterećenja aplikacijama.When we talk about computers and operating systems ti often raises the question of performance or which operating system runs faster and better. The purpose of this paper is to try to explain, calculate and visually display the use of resources in two of the most famous Microsoft's products: Windows XP, which has made a revolution in the world of Windows and Windows 7, which reads like a worthy successor to the title. Measurements will be made on an application that uses Windows system tables in order to calculate the usage of processor units. Which system is faster, which works better with regard to the use of processors based on the system and applications will be covered in the paper