This investigation proposes a grey-based Taguchi method to solve the multi-response problems. The grey-based Taguchi method is based on the Taguchi’s design of experimental method, and adopts grey relational analysis (GRA) to transfer multiresponse problems into single-response problems. In this investigation, an attempt has been made to optimize the drilling process parameters considering weig...

During the micro-drilling process of stainless steel, the wear, fracture, and breakage of the micro-drill easily occur. Micro-drill geometry parameters have significant influence on the drilling performance of the micro-drill. Nowadays, the helical point micro-drill is proposed and its improved drilling performance is validated by some researchers. In this study, to analyze the effect of geomet...

Twenty four cases of subdural empyema are reviewed. The overall mortality was 17%, 18 patients were managed by burr hole and five by craniotomy or craniectomy. Antibiotic therapy was commenced once pus had been evacuated. Infection of the paranasal and mastoid sinuses was the commonest aetiological factor. Aspiration of pus through burr holes is the recommended surgical procedure with low morta...

Objective To evaluate the effectiveness and efficacy of delayed burr hole surgery in relation to the reduction of postoperative subdural hematoma (SDH) volume in patients with acute SDH. Methods We retrospectively analyzed patients with acute SDH who received delayed burr hole surgery at our institute. Age, sex, Glasgow coma scale, maximal SDH thickness, volume of SDH, midline shifts, hounsfi...

This work studies the open hole surface integrity of Al 2024-T3/Ti-6Al-4V stacks, which have been subjected to different making methods, namely, conventional drilling and helical milling. The resulting hole-exit burr, roughness machined surface/sub-surface microstructures characterized impact on fatigue performance coupons has revealed. Results show that milling can effectively reduce burr form...

The perplexing mystery of why so many trephined skulls from the Neolithic period have been uncovered all over the world representing attempts at primitive cranial surgery is discussed. More than 1500 trephined skulls have been uncovered throughout the world, from Europe and Scandinavia to North America, from Russia and China to South America (particularly in Peru). Most reported series show tha...

on the 10th April 1879, in a state of insensibility, with an injury to the head. The following day, while passing through Kashipore in medical charge of a detachment of British Troops, I was asked by the Assistant-Surgeon of the hospital to see the case ; he told me he suspected fracture of the skull. The history of the patient is as follows :?two hours prior to her reception into hospital, the...