In this paper, we identify an error in the proof of Theorem 1 in the paper Xia, L., Zhao, Q., and Jia, Q.S., “A Structure Property of Optimal Policies for Maintenance Problems with Safety-Critical Components”, IEEE Transactions on Automation Science and Engineering, 2008, 5(3): 519-531. Theorem 1 is the most important contribution of the above paper, which shows the optimality of the so-called ...

Power distribution systems are subject to faults that may cause damage the grid and electric service interruptions. The outage impact can be attenuated by a restoration procedure reconfigures until faulted component repaired. Proposals for this usually either fully centralized or decentralized. In paper, hybrid approach (partially decentralized) problem based on multi-agent system (MAS) is prop...

This paper presents the results of a literature search for publications containing failure rates and repair times, based on operational experience, for distribution system components that are critical to the reliability of a distribution system. Furthermore, component failure rates found are compared with the conclusions drawn from a previously conducted literature search.

Introduction: The restoration of endodontically treated teeth is a topic that has been studied extensively but it is still a challenge for dental practitioners. The aim of this study was to evaluate fracture resistance, fracture patterns and fracture location of endodontically treated human maxillary premolars restored with direct and indirect composite resin and ceramic restoration. Methods: E...

Background Necrosis after myocardial infarction may cause aneurysm in the left ventricle. Disorders of contractility in the left ventricle due to aneurysm can result with congestive heart failure, ventricular arrhythmia and thromboemboli. This is a retrospective analysis of our clinical experience in the restoration of left ventricular aneurysm via modified linear closure during off pump corona...

Congenital spinal extradural cysts are rare and may be the cause of acute paraplegia. In their clinical features they closely resemble acute transverse myelitis. Immediate decompression of the spinal cord and removal of the cyst may lead to restoration of normal function. Myelography differentiates these two conditions by showing a cyst in communication with the spinal canal. This investigation...

We describe a 54-year-old woman with isolated pulmonary arterial hypertension accompanied by hyperthyroidism due to Graves' disease. Her pulmonary artery hypertension resolved spontaneously after restoration of euthyroidism. This case suggests that hyperthyroidism should be considered a reversible cause of pulmonary arterial hypertension.

Introduction: Retention of provisionallycemented implant-supported restorations plays an important role in success of the treatment. Uncemented restorations may cause several problems such as restoration swallowing, increased bone loss and prosthesis failure. Therefore, suitable cement compromising between retention and retrievability as well as extra-means of abutment retention might be prefer...

Stroke is a common cause of death and disability in industrialized nations. Technical advances and the increased availability of noninvasive brain imaging techniques have permitted precise and early diagnosis of acute cerebral ischemia. This has made emergent thrombolytic therapy for rapid restoration of cerebral perfusion increasingly possible. Herein, the authors present a review of the clini...

As the essential cause of shock in acute haemorrhage is the resulting low blood volume, the restoration of blood volume by transfusion is the most important step in treatment. Intravenous saline or glucose-saline infusions are inadequate as their effect is only transitory, although they are a valuable supplementary when dehydration complicates the picture. Definite indications for transfusion a...