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Wyszukujesz frazę "Abdulla, A. A." wg kryterium: Autor

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    Wyświetlanie 1-6 z 6
    Tytuł:
    Integration of navigation, vision, and arm manipulation towards elevator operation for laboratory transportation system using mobile robots
    Autorzy:
    Abdulla, A. A.
    Ali, M. M.
    Stoll, N.
    Thurow, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/384579.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    mobile robot
    multi-floor
    elevator handler
    floor estimation
    labware transportation system
    kinematic analysis
    robotic arm control
    object detection
    localization
    Intel Real sense F200 sensor
    Opis:
    In the automated environments, mobile robots play an important role to perform different tasks such as objects transportation and material handling. In this paper, a new method for a glassy elevator handling system based on H20 mobile robots is presented to connect distributed life science laboratories in multiple floors. Various labware and tube racks have to be transported to different workstations. Locating of elevator door, entry button detection, internal buttons recognition, robot arm manipulation, current floor estimation, and elevator door status checking are the main operations to realize a successful elevator handling system. The H20 mobile robot has dual arms where each arm consists of 6 revolute joints and a gripper. The gripper has two degrees of freedom. Different sensors have been employed with the robot to handle these operations such as Intel RealSense F200 vision sensor for entry and internal buttons detection with position estimation. A pressure sensor is used for current floor estimation inside the elevator. Also, an ultrasonic proximity distance sensor is utilized for checking the elevator door status. Different strategies including HSL color representation, adaptive binary threshold, optical character recognition, and FIR smoothing filter have been employed for the elevator operations. For pressing operation, a hand camera base and a new elevator finger model are designed. The elevator finger is resolved in a way to fit the arm gripper which is used also to manipulate the labware containers. The Kinematic solution is utilized for controlling the arms’ joints. A server/client socket architecture with TCP/IP command protocol is used for data exchange between Multi-Floor System and the H20 robot arms. Many experiments were conducted in life science laboratories to validate the developed systems. Experimental results prove an efficient performance with high success rate under different lightening condition.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2017, 11, 4; 34-50
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mobile robot transportation for multiple labware with hybrid pose correction in life science laboratories
    Autorzy:
    Ali, M. M.
    Abdulla, A. A.
    Stoll, N.
    Thurow, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/384665.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    robot position correction
    multiple labware transportation
    mobile robot localization
    motor encoder
    localization error handler
    Kinect V2
    grasping operation
    placing operation
    multi-floor
    Opis:
    In automated working environments, mobile robots can be used for different purposes such as material handling, domestic services, and objects transportation. This work presents a transportation process for multiple labware with hybrid pose correction in life science laboratories using H20 mobile robots. Multiple labware and tube racks, which contain chemical and biological components, have to be transported safely between laboratories on different floors of life science environment. Therefore, an accurate approach for labware transportation is required. The H20 robot has dual arms each consisting of 6 revolute joints with 6-DOF. The problem statement of robot positioning error in front of the workstation is presented. The navigation strategy with its related systems is presented for multi-floor mobile robot transportation environment. A Stargazer module is used as a stable and low-cost mapping and localization sensor with artificial landmarks. An error management system to overcome incorrect stargazer reading problems is presented. Different strategies of pose correction for mobile robots are described. The H20 robot is equipped with sonar sensors and Kinect V2 to be used for labware manipulation and position correction. The Kinect sensor V2 with SURF algorithm (Speeded-Up Robust Features) is used to recognize and localize the target. The communication procedure between the transportation platforms is done using client-server models.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2017, 11, 4; 51-64
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Natural filler based composite materials
    Autorzy:
    Nayeeif, A.A.
    Hamdan, Z.K.
    Metteb, Z.W.
    Abdulla, F.A.
    Jebur, N.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/24200565.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    polyester resin
    composite natural materials
    tensile
    bending
    żywica poliestrowa
    kompozytowe materiały naturalne
    rozciąganie
    gięcie
    Opis:
    Purpose: The first goal is to get rid of waste and reduce environmental pollution, and the other goal is to investigate the effect of these fibres on properties (resistance of composite materials for bending and tensile testing) of polyester and use them in applications. Also, The moisture environment effect on the properties of composite materials was studied. Design/methodology/approach: It uses natural fibres, which are considered waste, namely eggshell and sawdust with polyester. Several samples were prepared with different weight percentages (30% and 40%), and their mechanical properties were studied and immersed in water for 15 days. And studying the effect of water on these properties. It was found that it is possible to use these fibres (waste) with polyester and benefit from them. It was found that when adding fibres to polyester, the tensile strength decreases, but the bending increases the strength. Finally, it was found that when the samples are immersed in water, the material weakens, and its mechanical properties decrease. Findings: It can be noticed that adding natural fibres by 40% and 30% improved the mechanical properties of polyester in the bending test, where the bending test increased with increased volume fraction of fibre. It can be noticed that adding natural fibres by 40% and 30% decreased the mechanical properties (tensile strength) of polyester in a tensile test. When the natural composite materials were treated with water for 15 days, water decreased the mechanical properties in bending and tensile test. Research limitations/implications: One of the limitations of this research that was found through the work is that when increasing the weight ratios of the fibres added to polyester leads to the failure of polyester, so we recommend using lower weight ratios of fibre. Practical implications: One of the limitations of this research that was found through the work is that when increasing the weight ratios of the fibres added to polyester leads to the failure of polyester, so we recommend using lower weight ratios of fibre. Originality/value: The original value of this research is the use of fibres that are considered waste, their reuse, and utilization in some applications that do not require composite materials with high mechanical properties.
    Źródło:
    Archives of Materials Science and Engineering; 2022, 116, 1; 5--13
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Using Singular Value Decomposition (SVD) as a solution for search result clustering
    Autorzy:
    Abdulla, H. D.
    Abdelrahman, A. S.
    Snasel, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/377259.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    singular value decomposition
    clustering
    self-organizing map
    Opis:
    There are many search engines in the web, but they return a long list of search results, ranked by their relevancies to the given query. Web users have to go through the list and examine the titles and (short) snippets sequentially to identify their required results. In this paper we present how usage of Singular Value Decomposition (SVD) as a very good solution for search results clustering. Results are presented by visualizing neural network. Neural network is responsive for reducing result dimension to two dimensional space and we are able to present result as a picture that we are able to analyze.
    Źródło:
    Poznan University of Technology Academic Journals. Electrical Engineering; 2014, 80; 71-78
    1897-0737
    Pojawia się w:
    Poznan University of Technology Academic Journals. Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Trend Detection in Climate Change Indicators Using Non-Parametric Statistics: A Case Study of Abu Dhabi, United Arab Emirates
    Autorzy:
    Basarir, A.
    Arman, H.
    Hussein, S.
    Murad, A.
    Aldahan, A.
    Abdulla Al-Abri, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031779.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    92.70.Kb
    92.05.Df
    Opis:
    This study focuses on detecting trends for climate change indicators, such as average monthly temperature, rainfall, humidity, and wind speed for fourteen stations located between Al Ain and Abu Dhabi cities of the United Arab Emirates. Mann-Kendall non-parametric test was run on monthly time series data for the period 2003-2015 with consideration of seasonality. Significant increasing/decreasing trends in rainfall (for four stations), humidity (for six stations), and wind speed (for nine stations) were detected while no significant trend was observed in temperature for all stations.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 3; 655-657
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Low back pain among female nurses in Yemen
    Autorzy:
    Ghilan, Khaled
    Al-Taiar, Abdulla
    Yousfi, Nuha A.
    Zubaidi, Rania A.
    Awadh, Iman
    Al-Obeyed, Zaher
    Powiązania:
    https://bibliotekanauki.pl/articles/2179133.pdf
    Data publikacji:
    2013-08-01
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    low back pain
    nurses
    prevalence
    risk factors
    Yemen
    Opis:
    Objectives: This study aimed to investigate the prevalence of Low Back Pain (LBP) among female nursing staff and explore the potential risk factors associated with LBP. Methods: An analytical cross-sectional study was conducted on randomly selected female nurses using payroll as a sampling frame in all public hospitals in Sana'a City, Yemen. Data was collected through face-to-face interview using a structured, pre-coded questionnaire that was available in Arabic and English. Weight and height of the nurses were measured using weight and height scales and body mass index was calculated. Multiple logistic regression was used to identify the factors associated with LBP. Results: Out of 696 female nurses selected, 687 (98.7%) responded. The life-time, the 12-month and one-week prevalence rates of LBP among female nurses were 512 (74.5%; 95% CI: 71.1-77.7%), 411 (59.8%; 95% CI: 56.0-63.5%) and 249 (36.2%; 95% CI: 32.6-39.9%), respectively. The prevalence was significantly lower in Indian nurses compared to other nurses. Three out of every 10 nurses with LBP had sick leave because of LBP in the last 12 months. Factors that showed significant association with LBP among nursing staff in the multivariate analysis were age, nationality, menstrual disorders and stress level at work. Conclusion: LBP is common among female nurses in Yemen. The role of menstrual disorders in developing LBP among female nurses seems to be important. Although sharing the same working conditions, Indian nurses were less likely to report LBP, which highlight the importance of cultural differences in willingness to report LBP.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2013, 26, 4; 605-614
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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