Intelligent dual curve-driven tool path optimization and virtual CMM inspection for sculptured surface CNC machining

This paper investigates the profitability of a dual‐curve driven surface finish tool path under the concept of optimizing crucial machining parameters such as toroidal end‐mill diameter, lead angle and tilt angle. Surface machining error as well as tool path time are treated as optimization objectives under a multi‐criteria sense, whilst a central composite design is conducted to obtain experimental outputs for examination and, finally, fit a full quadratic model considered as the fitness function for process optimization by means of a genetic algorithm. A benchmark sculptured surface given as a second‐order parametric equation was tested and simulated using a cutting‐edge manufacturing modeling software and best parameters recommended by the genetic algorithm were implemented for validation. Further assessment involves the virtual inspection to selected profile sections on the part. It was shown that the approach can produce dual‐curve driven tool trajectories capable of eliminating sharp scallop heights, maximizing machining strip widths as well as maintaining smoothness quality and machining efficiency

Recovery of dialysis patients with COVID-19 : health outcomes 3 months after diagnosis in ERACODA

Background. Coronavirus disease 2019 (COVID-19)-related short-term mortality is high in dialysis patients, but longer-term outcomes are largely unknown. We therefore assessed patient recovery in a large cohort of dialysis patients 3 months after their COVID-19 diagnosis. Methods. We analyzed data on dialysis patients diagnosed with COVID-19 from 1 February 2020 to 31 March 2021 from the European Renal Association COVID-19 Database (ERACODA). The outcomes studied were patient survival, residence and functional and mental health status (estimated by their treating physician) 3 months after COVID-19 diagnosis. Complete follow-up data were available for 854 surviving patients. Patient characteristics associated with recovery were analyzed using logistic regression. Results. In 2449 hemodialysis patients (mean ± SD age 67.5 ± 14.4 years, 62% male), survival probabilities at 3 months after COVID-19 diagnosis were 90% for nonhospitalized patients (n = 1087), 73% for patients admitted to the hospital but not to an intensive care unit (ICU) (n = 1165) and 40% for those admitted to an ICU (n = 197). Patient survival hardly decreased between 28 days and 3 months after COVID-19 diagnosis. At 3 months, 87% functioned at their pre-existent functional and 94% at their pre-existent mental level. Only few of the surviving patients were still admitted to the hospital (0.8-6.3%) or a nursing home (∼5%). A higher age and frailty score at presentation and ICU admission were associated with worse functional outcome. Conclusions. Mortality between 28 days and 3 months after COVID-19 diagnosis was low and the majority of patients who survived COVID-19 recovered to their pre-existent functional and mental health level at 3 months after diagnosis

Een dak van sterren

Mijn masterthesis is een onderzoek naar de plek van het Amsterdams Bostheater. Het bevat tevens daaruit voortvloeiende scenario's voor een interventie in die bepaalde plek. De plek wordt omschreven aan de hand van zijn kwaliteiten. Deze worden gedestilleerd uit bestaande architectuurtheorie, akoestiekonderzoek en precedentenonderzoek.Architectur

Relationship between needle phobia and dental anxiety

Purpose: This cross-sectional study aimed to explain the nature of needle phobia and its relationship in dental phobic children with evidence on age-related differences. Methods: The study used 2,865 patients (52% boys, 48% girls), 4 to 11 years old (mean=7.18 years). The patient sample included randomly selected patients (N=2,153) and an anxious group of children (N=712). Children were divided into 3 age groups (4-6, 7-9, and 10-11 years). The Children Fear Survey Schedule - Dental Subscale (CFSS-DS) was used to assess age-related needle phobia (CFSS-DS question 3) and dental anxiety. Children were arranged into 3 anxiety groups (cutoffs=scores of 25 and 37). Children who scored >37 were considered needle-phobic. Statistical analysis was performed using Statistics for Windows 10. Results: Needle phobia progressively decreases with increasing age (19% of 4- to 6-year-old vs 11% of 10- to 11-year-old needle phobics; P≤05). Stepwise regression analysis revealed needle phobia does not primarily seem to be related to dental anxiety. Other aspects, like having had someone examine the mouth and the dentist drilling, contribute the most to dental anxiety in both low- and high-anxiety children. Fear of doctors is more specific for high-anxiety children (P≤05). A significant age-related difference regarding needle phobia is found between children ages 4 to 6 and 7 to 9 and between children ages 4 to 6 and 10 to 11 (P≤001). Conclusions: Needle phobia is age related, but should be considered a separate phenomenon. It is not specific for dental anxiety and is related to other painful treatment

Relationship between needle phobia and dental anxiety

Purpose: This cross-sectional study aimed to explain the nature of needle phobia and its relationship in dental phobic children with evidence on age-related differences. Methods: The study used 2,865 patients (52% boys, 48% girls), 4 to 11 years old (mean=7.18 years). The patient sample included randomly selected patients (N=2,153) and an anxious group of children (N=712). Children were divided into 3 age groups (4-6, 7-9, and 10-11 years). The Children Fear Survey Schedule - Dental Subscale (CFSS-DS) was used to assess age-related needle phobia (CFSS-DS question 3) and dental anxiety. Children were arranged into 3 anxiety groups (cutoffs=scores of 25 and 37). Children who scored >37 were considered needle-phobic. Statistical analysis was performed using Statistics for Windows 10. Results: Needle phobia progressively decreases with increasing age (19% of 4- to 6-year-old vs 11% of 10- to 11-year-old needle phobics; P≤05). Stepwise regression analysis revealed needle phobia does not primarily seem to be related to dental anxiety. Other aspects, like having had someone examine the mouth and the dentist drilling, contribute the most to dental anxiety in both low- and high-anxiety children. Fear of doctors is more specific for high-anxiety children (P≤05). A significant age-related difference regarding needle phobia is found between children ages 4 to 6 and 7 to 9 and between children ages 4 to 6 and 10 to 11 (P≤001). Conclusions: Needle phobia is age related, but should be considered a separate phenomenon. It is not specific for dental anxiety and is related to other painful treatment