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Maxantalet träffar du kan exportera från sökgränssnittet är 250. Vid större uttag använd dig av utsökningar.
  • 1.
    Hamid Muhammed, Hamed
    KTH, Skolan för teknik och hälsa (STH), Informatik, logistik och management (Stängd 20130701).
    Activation by Collective Learning, Performing Coursework Activities by Team Work and Obtaining Individual Grades2012Konferensbidrag (Övrigt vetenskapligt)
  • 2.
    Hamid Muhammed, Hamed
    KTH, Skolan för teknik och hälsa (STH), Informatik, logistik och management (Stängd 20130701).
    Affordable simultaneous hyperspectral imaging2013Ingår i: Sensor Review, ISSN 0260-2288, E-ISSN 1758-6828, Vol. 33, nr 3, s. 257-266Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Purpose - The aim of the research project which resulted in this work is to achieve a cost-effective approach for instantaneous hyperspectral imaging. Design/methodology/approach - This paper presents a simulation study and an experimental evaluation of a novel imaging spectroscopy technique, where multi-channel image data are acquired instantaneously and transformed into spectra by using a statistical modelling approach. A digital colour camera equipped with an additional colour filter array was used to acquire an instantaneous single image that was demosaicked to generate a multi-channel image. A statistical transformation approach was employed to convert this image into a hyperspectral one. Findings - The feasibility of this method was investigated through extensive simulation and experimental tasks where promising results were obtained. Practical implications The small size of the initially acquired single instantaneous image makes this approach useful for applications where video-rate hyperspectral imaging is required. Originality/value - For the first time, a simplified prototype of this novel imaging spectroscopy technique was built and evaluated experimentally. And the results were compared with those of a more ideal simulation study. Recommendations for how to improve the prototype were also suggested as a result of the comparison between the simulation and the prototype evaluation results.

  • 3.
    Hamid Muhammed, Hamed
    KTH, Skolan för teknik och hälsa (STH), Informatik, logistik och management (Stängd 20130701).
    Computerized Examination (e-exam) with Multiple Choice and Essay Questions2012Konferensbidrag (Övrigt vetenskapligt)
  • 4.
    Hamid Muhammed, Hamed
    et al.
    KTH, Skolan för teknik och hälsa (STH), Informatik, logistik och management (Stängd 20130701).
    Kothapalli, Veeravenkata S
    KTH, Skolan för teknik och hälsa (STH), Medicinsk teknik.
    Using Ultrasonic Spectrometry to Estimate the Stability of a Dental Implant Phantom2012Konferensbidrag (Refereegranskat)
  • 5.
    Hamid Muhammed, Hamed
    et al.
    KTH, Skolan för teknik och hälsa (STH), Informatik, logistik och management (Stängd 20130701).
    Zengin, Ziya
    Karadeniz Technical University, Trabzon, Turkey.
    Monte Carlo Simulation and a Review of the Physics of the Positron Annihilation Process in PET2013Ingår i: Engineering, ISSN 1947-394X, Vol. 5, nr 10BArtikel i tidskrift (Refereegranskat)
    Abstract [en]

     In this paper, we investigate the physics of the positron annihilation process, which occurs in a PET imaging system. In particular, the diffusion of beta particles (positrons) within water was addressed. Beta particles are emitted isotropically from the same source point with random directions and randomly chosen energy levels. After traversing a certain distance within water, beta particles lose a certain amount of its energy. The inelastic collisions with atomic electrons are mainly responsible for the energy dissipation of charged particles, such as electrons and positrons (that have low mass). The energy loss rate due to inelastic process is estimated by using the Beta-Bloch formula. These results help in understanding how to develop and implement a computationally efficient Monte Carlo Simulation of the positron annihilation process.

  • 6.
    Karbalaie, Abdolamir
    et al.
    KTH, Skolan för teknik och hälsa (STH), Informatik, logistik och management (Stängd 20130701).
    Montazeri, M. M.
    Hamid Muhammed, Hamed
    KTH, Skolan för teknik och hälsa (STH), Informatik, logistik och management (Stängd 20130701).
    New approach to find the exact solution of fractional partial differential equation2012Ingår i: WSEAS Transactions on Mathematics, ISSN 1109-2769, E-ISSN 2224-2880, Vol. 11, nr 10, s. 908-917Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this study, we present the exact solution of certain fractional partial differential equations (FPDE) by using a modified homotopy perturbation method (MHPM).The exact solutions are constructed by choosing an appropriate initial approximation and only one term of the series obtained by MHPM. The exact solutions for initial value problems of FPDE are analytically derived. The methods introduced an efficient tool for solving a wide class of time-fractional partial differential equations.

  • 7.
    Karbalaie, Abdolamir
    et al.
    KTH, Skolan för teknik och hälsa (STH), Informatik, logistik och management (Stängd 20130701).
    MONTAZERI, MOHAMMAD MEHDI
    Khomeinishahr Branch Islamic Azad University Khomeinishahr, Isfahan.
    SHABANI, MARYAM
    Naghsh Jahan Intelligent and Communication Engineering Sahin Shahr, Isfahan IRAN.
    Erlandsson, Björn-Erik
    KTH, Skolan för teknik och hälsa (STH), Informatik, logistik och management (Stängd 20130701). Royal Institute of Technology KTH.
    Application of Homo-separation of variables method on nonlinearsystem of PDEs2014Ingår i: WSEAS Transactions on Mathematics, ISSN 1109-2769, E-ISSN 2224-2880, Vol. 13, s. 992-1000Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this study, the Homo-Separation of Variables method is introduced to find the exact solution of somecoupled nonlinear partial differential equations. This analytical method is a new combination of two powerfuland popular methods; namely the homotopy perturbation method (HPM) and the separation of variables method.The exact solution is constructed by choosing an appropriate initial approximation in addition to retaining onlythe first term of the series obtained by HPM. The proposed method is capable of reducing the computational loadconsiderably when compared to other classical method.

  • 8.
    Moustafa, Ahmed
    et al.
    KTH, Skolan för teknik och hälsa (STH).
    Hamid Muhammed, Hamed
    KTH, Skolan för teknik och hälsa (STH), Informatik, logistik och management (Stängd 20130701).
    Hassan, Moustapha
    Karolinska Institutet.
    Skin Cancer Detection by Temperature Variation Analysis2012Konferensbidrag (Övrigt vetenskapligt)
  • 9. Nagarajan, A.
    et al.
    Varadharajan, V.
    Hitchens, M.
    Arora, Saurabh
    KTH, Skolan för teknik och hälsa (STH), Informatik, logistik och management (Stängd 20130701).
    On the applicability of trusted computing in distributed authorization using Web services2008Konferensbidrag (Refereegranskat)
    Abstract [en]

    Distributed authorization provides the ability to control access to resources spread over the Internet. Typical authorization systems consider a range of security information like user identities, role identities or even temporal, spatial and contextual information associated with the access requestor. However, the ability to include computing platform related information has been quite limited due to constraints in identification and validation of platforms when distributed. Trusted computing is an exciting technology that can provide new ways to bridge this gap. In this paper, we provide the first steps necessary to achieving distributed authorization using trusted computing platforms. We introduce the notion of a Property Manifest that can be used in the specification of authorization policies. We provide an overview of our authorization architecture, its components and functions. We then illustrate the applicability of our system by implementing it in a Web service oriented architecture.

1 - 9 av 9
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