62 research outputs found
Heuristics for the traveling repairman problem with profits
In the traveling repairman problem with profits, a repairman (also known as the server) visits a subset of nodes in order to collect time-dependent profits. The objective consists of maximizing the total collected revenue. We restrict our study to the case of a single server with nodes located in the Euclidean plane. We investigate properties of this problem, and we derive a mathematical model assuming that the number of visited nodes is known in advance. We describe a tabu search algorithm with multiple neighborhoods, and we test its performance by running it on instances based on TSPLIB. We conclude that the tabu search algorithm finds good-quality solutions fast, even for large instances
Incidental radiological finding of a renal tumour leading to the diagnosis of Birt-Hogg-Dubé syndrome
Birt-Hogg-Dubé (BHD) syndrome is a rare autosomal dominant condition characterised by benign tumours of the hair follicle, renal cancer, pulmonary cysts and spontaneous pneumothorax. We report the diagnosis of a BHD syndrome achieved after incidental radiological finding of a renal tumour in a 24-year old man. The patient also displayed recurrent pneumothoraces and showed to have cysts in the basis of both lungs. The association of recurrent pneumothoraces and renal neoplastic disease should alert for the possible presence of this syndrome
CBCT of osteogenesis imperfecta of the inner ear
A 42-year-old female known with osteogenesis imperfecta (OI) was referred to our department with complaints of deteriorating hearing loss. The medical history, besides some limb fractures, secondary to the OI, was negative. During clinical examination, a sensorineural hearing loss was confirmed bilaterally
Mobiliseren, dynamiseren en enthousiasmeren van onze (toekomstige) zilvervloot op de arbeidsmarkt
Friday: Fish Day
A 78-year-old man presented with diffuse abdominal pain, localized peritonitis and raised inflammatory markers. CT revealed an mesentery abcess with a linear high density structure in continuity with the adjacent small bowel lumen. Laparoscopy showed a perforation by a fish bone. Gastrointestinal tract perforation by foreign body ingestion is rare complication (1%). There are some risk factors and prefered locations of perforation. Time interval between ingestion and complication can vary extremely
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