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RISS 인기검색어
- 검색키워드
- 저자 : Mahmoud Elfeky (검색결과 2 건)
- 무료
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Modeling and Simulation of Quadrotor UAV with Tilting Rotors
Mahmoud Elfeky,Moustafa Elshafei,Abdul-Wahid A. Saif,Mohamed F. Al-Malki 제어·로봇·시스템학회 2016 International Journal of Control, Automation, and Vol.14 No.4
Quadrotors have recently been drawing greater research and commercial attention to the point that theyhave become one of the most popular types of unmanned aerial vehicles. Their applications vary from entertainmentto transportation, commercial and even military applications. In this paper, a novel quadrotor design is proposed. The design decouples all motions by allowing each rotor to tilt in two directions about the quadrotor fixed frame. This modification improves the stability and safety of the quadrotor and gives it more manoeuvrability and robustness. The mathematical model of the proposed system is carried out using Newton-Euler technique. Several flightscenarios are also simulated under a simple PID controller to illustrate the superiority over conventional quadrotordesigns.
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Mahmoud Wahba,Ghada Habib,Ahmed El Mazny,May Fawzi,Mohamed A. Elfeki,Seham Sabry,Mahommad ELbaz,Sayed M Seif El Nasr 대한소화기내시경학회 2019 Clinical Endoscopy Vol.52 No.5
Background/Aims: Food bolus impaction is the most common form of esophageal foreign body impaction observed in adults. Clinicalguidelines recommend using the push technique or retrieval methods in such cases. The push technique can cause injuries in certainclinical situations. Notably, conventional retrieval methods are time and effort consuming. Cap-assisted endoscopic extraction of animpacted food bolus is an easy and effective technique; however, more data are needed for its validation. This study compared the capassistedextraction technique with conventional methods. Methods: This prospective observational multicenter study compared the success and en bloc removal rates, total procedure time, andadverse events in both techniques.. Results: The study included 303 patients who underwent food bolus extraction. The push technique was used in 87 patients (28.7%) anda retrieval procedure in 216 patients (71.3%). Cap-assisted extraction was performed in 106 patients and retrieval using conventionalmethods in 110 patients. The cap-assisted technique was associated with a higher rate of en bloc removal (80.2% vs. 15%, p<0.01), shorterprocedure time (6.9±3.5 min vs. 15.7±4.1 min, p<0.001), and fewer adverse events (0/106 vs. 9/110, p<0.001). Conclusions: Cap-assisted extraction showed no adverse events, higher efficacy, and a shorter procedure time compared withconventional retrieval procedures.
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