http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Moustafa Elshafei (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
-
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.
-
Decentralized Backstepping Control of a Quadrotor with Tilted-rotor under Wind Gusts
Abdul-Wahid A. Saif,Abdulrahman Aliyu,Mujahed Al Dhaifallah,Moustafa Elshafei 제어·로봇·시스템학회 2018 International Journal of Control, Automation, and Vol.16 No.5
Conventional unmanned aerial vehicles, quadrotor have a plethora of applications for civilian and military purposes. Quadrotors as the name implies usually have four input variables (fixed rotors) which are used to drive six outputs (i.e., 3 translational and 3 rotational motions), and this leads to coupling between motions. Tilt- rotor quadrotors are more versatile because they have more input variables to independently control its orientation and position without coupling. In this paper, a decentralized backstepping control approach is used to generate a new set of inputs capable of independently and simultaneously achieve decoupling of motions while rejecting wind disturbances. The tiltrotor quadrotor dynamic is first decentralized to achieve six subsystems, then controller inputs for each subsystem are generated via Lyapunov based backstepping method whereby the controller parameters are optimized by Differential Evolution (DE) technique. This system exhibits robustness capability because it is able to reject external disturbances.
-
Tamer N Abdelbaki,Noureldin Ahmed,Mahmoud Ahmed Alhussini,Moustafa Elshafei 대한내시경로봇외과학회 2024 Journal of Minimally Invasive Surgery Vol.27 No.1
Purpose: This study aims to explore the feasibility and implications of Ramadan fasting for patients who have undergone laparoscopic sleeve gastrectomy (LSG), assessing impacts on hydration, nutrient intake, weight management, and gastrointestinal symptoms. Methods: A prospective online survey was conducted among 218 LSG patients and 83 control individuals with obesity who had not undergone surgery. Participants were surveyed before and after Ramadan, providing data on fasting practices, hunger and satiety levels, fluid and nutrient intake, and the occurrence of gastrointestinal symptoms. Statistical analysis was used to compare outcomes between fasting and non-fasting periods and between LSG patients and control participants. Results: A total of 70.2% of LSG patients completed the entire month of Ramadan fasting, with a significant correlation found between the duration post-surgery and the ability to fast. Fasting LSG patients reported decreased hunger, increased satiety, and significant reductions in fluid and nutrient intake during Ramadan. Weight loss was reported in 90.8% of fasting patients, with an average total weight loss of 7.2%. Gastrointestinal symptoms were mild and manageable. Conclusion: The majority of LSG patients can successfully fast during Ramadan with appropriate precautions, including adequate fluid and protein intake. The study highlights the need for patient education and tailored nutritional guidance to ensure safe and effective fasting post-LSG. In order to fast for the entire month, patients may be advised to consider postponing surgery for a few months after Ramadan, avoid overeating during non-fasting hours, and ensure sufficient fluid consumption and protein intake during fasting.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
