In this paper we investigate the performance of an Optical Code Division Multiplexing/Wavelength Division Multiplexing (WDM/OCDM) Optical Packet Switch when impairment due to both Multiple Access Interference and Beat noise are taken into account. Analytical models are introduced to dimension the switch resources, in particular the number of optical codes carried on each wavelength. The Packet ...

Acute leukemia which is the most common cancer in children is a heterogeneous group of clonal malignancies. The conversion of the leukemic cell lineage during the course of the disease or later is termed lineage switch. It has been rarely reported in the literature. In leukemia lineage switch, conversions from lymphoblastic leukemia to myeloid leukemia or vice versa are reported. Herein, we rep...

Schneider and Logan (2006) recently showed that cue-switch and task-switch costs are sensitive to the relative probability of cue switches versus task switches. From this they concluded that task-switch costs reflect priming of cue-cue transitions rather than actual task-switching operations. However, because this design confounded probability of specific cue transitions with probability of tas...

Two patients with an intraluminal carcinoid tumour obstructing the right main bronchus in one, and the left main bronchus in the other, resulting in unilateral increased transradiancy from hypoperfusion of the lung, are described. Resection of the tumours and reconstruction of bronchial continuity was followed by return of perfusion to normal between three and 18 months after the operation. The...

Foreign bodies [FB] in the bronchus are important causes of morbidity and mortality in paediatric age group and pose diagnostic and therapeutic challenges. Inert and smooth foreign bodies are prone for migration from one side to other due to minimal inflammatory process and easy mobility. Herein we are reporting a case of electric bulb aspiration which migrated from right main bronchus to left ...

Here, we report the successful treatment of a 40-year-old man with mucoepidermoid carcinoma that originated in the proximal end of the left main bronchus close to the carina. He underwent wide and deep airway wedge resection, including the distal trachea and part of the carina via left postero-lateral thoracotomy. He has demonstrated neither anatomic complications nor disease recurrence 2 years...

Benign bronchial stenosis is managed by surgical or bronchoscopic methods. Although surgical approach is definitive, it is technically demanding and is costlier than bronchoscopic treatment. Here, we report the case of a 27-year-old female patient with symptomatic benign bronchial stenosis of the left main bronchus. The stenosis was dilated successfully through a fibreoptic bronchoscope by elec...

abstract the aim of this paper is to illustrate the role of metaphor in education. the main thesis is that the metaphors shape our attitude towards education implicitly.  with this aim in mind, first, the concept of metaphor is briefly introduced, and then three of the most famous metaphors that have been used in education (factories, gardening and travel), and their differences are discussed. ...

The general attributes governing the design of Local Power Supplies (LPS) circuits that are piggybacked on a lossless turn off snubbers are highlighted and analyzed. Based on the proposed general principles, new LPS circuits are presented. They are incorporated as part of a lossless turnon/turn-off snubber. The proposed snubber/LPS topologies serve two important functions: they help to achieve ...

A 38-year-old tuberculous male Pakistani presented with halitosis and a cough especially marked when lying on his left side. Barium swallow demonstrated a fistula between oesophagus and left main bronchus. Anti-tuberculous therapy and repeated cauterization failed to close the fistula. Thoracotomy confirmed a congenital oesophago-bronchial fistula. Division and suture resulted in cure.