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Maria A. Seimeni,Panagiotis K. Gkonis,Dimitra I. Kaklamani,Iakovos S. Venieris,Christos A. Papavasiliou 한국통신학회 2015 ICT Express Vol.1 No.3
The primary goal of this study is to develop a simulation platform that ensures a synergy between WiMAX and WiFi at the PHY and MAC layers, manages the available resources efficiently, mitigates electromagnetic interference (EMI), and enhances the overall performance of heterogeneous networks. To achieve this synergy, the OFDMA physical layer protocol is implemented and combined with radio resource exploitation strategies and judicious power allocation to users. The COOPERATIVE subcarrier allocation strategy outperforms the RANDOM strategy in terms of mean capacity and EMI mitigation, because it efficiently manages radio resources and inherently combats CCI (hence, EMI is mitigated). Results also show that in real scenarios (low SINR WiFi ), the synergy between WiMAX and WiFi leads to a high mean capacity (and in some cases, a 15-fold increase). In terms of power levels, the dissipation by a user corresponds to less than 23% of the total available power (1 W).
Konstantinos Vasiliadis,Elena Moschou,Sofia Papaioannou,Panagiotis Tzitzis,Albion Totsi,Stamatia Dimou,Eleni Lazaridou,Dimitrios Kapetanos,Christos Papavasiliou 한국간담췌외과학회 2020 Annals of hepato-biliary-pancreatic surgery Vol.24 No.2
A typical bile duct branching patterns represent one of the major causes of bile duct injury (BDI) during laparoscopic cholecystectomy (LC). The most common classified variations of bile duct branching, involve the right posterior sectoral duct (RPSD) and its joining with the right anterior or left hepatic duct. Variant bile duct anatomy can rarely be extremely complex and unclassified. This report describes an extremely rare case of an isolated injury to an aberrant right hepatic duct formed by the joining of ducts from segments V, VII, and VIII draining into the cystic duct (cysticohepatic duct) during LC, associated with an inferior RPSD opening to left hepatic duct. Detailed evaluation of both endoscopic and magnetic cholangiograms established the diagnosis. Bile duct injury was subsequently managed surgically by a demanding Roux-en-Y hepaticojejunostomy. This extremely rare case aims to serve as a useful reminder of the consistent inconsistency of biliary anatomy, alerting surgeons to beware of variant bile duct branching patterns during open or LC that constitute a dreadful pitfall for severe and life-threatening bile duct injuries.