Network lifetime is one of the most critical performance measures for wireless sensor networks. Various schemes have been proposed to maximize the network lifetime. In this paper we consider the lifetime maximization problem via a new approach: adaptive power control. We focus on the sensor networks that consists of a sink and a set of homogeneous wireless sensor nodes, which are randomly deplo...

conclusions small dose of clopidogrel (75 mg) may lead to rare, life-threatening dah, so physicians should be aware of the possibility of dah after neurointervention in patients who have respiratory distress, worsening alveolar infiltrates accompanied by hemoptysis. introduction diffuse alveolar hemorrhage (dah) is a very rare complication but acute and life-threatening event. clopidogrel has g...

interventional techniques aim to find safer and better ways to treat vascular diseases even in many instances, the interventional radiology solutions has been considered the only treatment option for the patients. interventional radiologists are specialists who perform minimally invasive procedures instead of surgery or other treatments. these procedures apply various imaging and catheterizatio...

background: fenestration in the modified fontan operation allows right-to-left shunting, which reduces the fontan pathway pressure and improves cardiac output. however, on account of the fact that persistent right-to-left shunting results in cyanosis and paradoxical emboli, fenestration closure is recommended after recovery from the fontan operation. methods: this study recruited 3 patients who...

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aim : the aim of this study was to comprehensively analyze histopathologic parameters of whipple pancreaticoduodenectomy specimens at taleghani general hospital pathology department. background : the whipple procedure is performed for variety of tumors involving the head of the pancreas, ampulla of vater, common bile duct, or duodenum. patients and methods : records of all cases of whipple panc...

conclusions most cases of splenectomy in our center caused by trauma, and among the different types of trauma, blunt trauma is the dominant cause. road traffic accidents, in particular motor vehicle accidents, especially motorbike injures, are the most frequent cause of splenectomy. due to the instability of trauma patients, a mortality rate of 8% seems to be reasonable for splenectomy. rnwe re...