1,737 research outputs found
A Near-optimal Sensor Placement Algorithm to Achieve Complete Coverage/Discrimination in Sensor Networks
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Energy-Efficient Sensor Network Design Subject to Complete Coverage and Discrimination Constraints
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A Near-Optimal Sensor Placement Algorithm to Achieve Complete Coverage/Discrimination in Sensor Networks
No full textIn this letter, we develop a robust and scalable
algorithm to cope with the sensor placement problem for target
location under constraints of the cost limitation and the complete
coverage. The problem is NP-complete for arbitrary sensor fields.
The grid-based placement scenario is adopted and the sensor
placement problem formulated as a combinatorial optimization
problem for minimizing the maximum distance error in a sensor
field under the constraints. The proposed algorithm is based
on the simulated annealing approach. The experimental results
reveal that, for small sensor fields, the algorithm can find the
optimal sensor placement under the minimum cost limitation.
Moreover, it can also find a placement with minimum distance
error for large sensor fields under the cost limitation
Morbidity after elective resection of prenatally diagnosed asymptomatic congenital pulmonary airway malformations
No full textBackground/AimThe optimal management of prenatally diagnosed asymptomatic congenital pulmonary airway malformations (CPAM) is controversial. Since there is a paucity of data relating to surgical risks in this specific population, we reviewed our experience to further inform this controversy.MethodsEthically approved 10 year (2004–2013) retrospective review. Patients were included only if the CPAM was diagnosed prenatally and remained asymptomatic. Indication for surgery was physician recommendation and/or parental choice.Main resultsSixty patients were identified. Median age at surgery was 6.5 months (range 65 days to 9.6 years). Resections were performed thoracoscopically (n = 51, one conversion) or by thoracotomy (n = 9). Surgical time was 2.5 hr (43 min to 4.75 hr). A chest drain was used in 58/60 and remained in situ 53 hr (23–108). There were no intra‐operative complications or blood transfusions. All patients were extubated at the end of the procedure with no re‐intubations. Post‐operative hospitalization was 73.4 hr (23.8 hr to 4.2 days). Overall, complications occurred in 14/60 (23%). Eleven were minor but three were major: tension pneumothorax associated with new presentation of a small previously undiagnosed diaphragmatic hernia 5 days following resection; aggressive fibromatosis of the chest wall in the region close to resection 2 years later; and near‐fatal hypovolemic cardiac arrest due to massive haemorrhage from a feeding vessel on postoperative day 7. There were no deaths and no cases of pleuropulmonary blastoma.ConclusionResection of prenatally diagnosed asymptomatic CPAM is associated with a significant risk of complications, which may be life threatening. These data contribute to a balanced discussion of risks and benefits for these children
Silver sheaves; gathered through clouds and sunshine. In two parts. Part 1st: Civil and military life of the author. Part 2d: Miscellaneous collection of prose and poetry.
No full text2d ed.2 p.l., [9]-360 p
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