126 research outputs found
*Corresponding author
No full textAbstract: Accurate reconstruction of phylogenetic trees often involves solving hard optimisation problems, particularly the Maximum Parsimony (MP) and Maximum Likelihood (ML) problems. Various heuristics yield good results for these problems within reasonable time only on small datasets. This is a major impediment for large-scale phylogeny reconstruction. Roshan et al. introduced Rec-I-DCM3, an efficient and accurate meta-method for solving the MP problem on large datasets of up to 14,000 taxa. We improve the performance of Rec-I-DCM3 via parallelisation. The experiments demonstrate that our parallel method, PRec-I-DCM3, achieves significant improvements, both in speed and accuracy, over its sequential counterpart
Rapid coordinate system creation and mapping using Crickets
Get PDFThesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2004.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.Includes bibliographical references (leaves 55-56).In this thesis, I describe a system that lays the foundation for context-aware applications. This system allows a user to set up a reference coordinate system in a room, using three Cricket listeners attached to a wooden frame. The system then assigns coordinates to Cricket beacons, which are placed on the ceiling. Finally, by using the frame in conjunction with a laser range finder, the user can generate a map of the room in the reference coordinate system, complete with features including doors, walls, and windows. This thesis also describes necessary changes we implemented that made the Cricket positioning system much more accurate.by Roshan Bantwal Baliga.M.Eng
Challenges in Virtual Testing of Autonomous Vehicles
No full textThe worldwide development of Autonomous Vehicles (AVs) has also encouraged the use of software simulators for virtual testing of AVs. However, the effectiveness of the AV simulators is constrained by numerous challenges, such as their computational cost and lack of fidelity in specific areas. In this paper, we describe the modality of virtual testing and its benefits for AV development and validation. Moreover, we summarize and provide an overview of the state-of-the-art AV simulators, their limitations, and the current directions toward improvement.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Signal Processing System
Combinatory actions of CP29 phosphorylation by STN7 and stability regulate leaf age-dependent disassembly of photosynthetic complexes
Get PDF© 2020, The Author(s). A predominant physiological change that occurs during leaf senescence is a decrease in photosynthetic
efciency. An optimal organization of photosynthesis complexes in plant leaves is critical for efcient
photosynthesis. However, molecular mechanisms for regulating photosynthesis complexes during leaf
senescence remain largely unknown. Here we tracked photosynthesis complexes alterations during
leaf senescence in Arabidopsis thaliana. Grana stack is signifcantly thickened and photosynthesis
complexes were disassembled in senescing leaves. Defects in STN7 and CP29 led to an altered
chloroplast ultrastructure and a malformation of photosynthesis complex organization in stroma
lamella. Both CP29 phosphorylation by STN7 and CP29 fragmentation are highly associated with the
photosynthesis complex disassembly. In turn, CP29 functions as a molecular glue to facilitate protein
complex formation leading phosphorylation cascade and to maintain photosynthetic efciency during
leaf senescence. These data suggest a novel molecular mechanism to modulate leaf senescence via
CP29 phosphorylation and fragmentation, serving as an efcient strategy to control photosynthesis
complexes.11Nsciescopu
CoPEM: Cooperative Perception Error Models for Autonomous Driving
No full textIn this paper, we introduce the notion of Cooperative Perception Error Models (coPEMs) towards achieving an effective and efficient integration of V2X solutions within a virtual test environment. We focus our analysis on the occlusion problem in the (onboard) perception of Autonomous Vehicles (AV), which can manifest as misdetection errors on the occluded objects. Cooperative perception (CP) solutions based on Vehicle-to-Everything (V2X) communications aim to avoid such issues by cooperatively leveraging additional points of view for the world around the AV. This approach usually requires many sensors, mainly cameras and LiDARs, to be deployed simultaneously in the environment either as part of the road infrastructure or on other traffic vehicles. However, implementing a large number of sensor models in a virtual simulation pipeline is often prohibitively computationally expensive. Therefore, in this paper, we rely on extending Perception Error Models (PEMs) to efficiently implement such cooperative perception solutions along with the errors and uncertainties associated with them. We demonstrate the approach by comparing the safety achievable by an AV challenged with a traffic scenario where occlusion is the primary cause of a potential collision.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Signal Processing System
A research about the real author of Marzbanname Tabari
No full textMarzbanname is the name of a book which includes narrations and allegories and marzban wrote it in old tabari language. Mohammad Ibn Ghazi maltivi in 598 A.H. and sadoddin varavini in the first half of seventh century translated it to farsi. Onsorolma' ali keykavos, the writer of Ghaboosname and Ibn Esfandyar, the writer of tarikhe – Tabarestam believe that marzban ibne Rostam ibne shervin (the 13th king of Bavandiya kiyosiye chain) in the real writer of marzbanname. But sa'daddin varavini believes that marzban ibne shervin (shervin = 5th king of Bavandiye kiyosiye) is the writer of it. Reza Gholi khane – hedayat knows marzban- Ibn – e – rostam as the outher of marzban-e-Deylami in some other books. Among the contemporaries, shefer knows marzban-ibn –e-rostam-ibn –e- sorkhab – ibn – e- Gharan as the author of marzban name, but Allame Ghazvini rejects this hierarchical order. Allame Dehkhoda, Esmaeil mahjouri, Ardeshir Barzegar and Hossein Eslami believe that marzban- ibn- e- Rostam wrote maezban name. mohammad Roshan reject all and say that there is no book named marzban name tabari.This article believes that varavini's speech about the writer of marzbanname is correct but not of onsorolma' ali keykavoos and ibne Esfandyar's speech
Probing the Mechanics of Crumpled Graphene Membranes under Tensile Loading: An Experimental Study
No full textGraphene is considered a promising material due to its unique electrical characteristics and excellent mechanical properties. These extraordinary properties make graphene a suitable material for applications like mechanical reinforcements, protective coatings, supercapacitors, sensors, etc. However, when trying to extract these properties experimentally, the challenge of producing pristine graphene prohibits researchers from attaining the required results. The challenge is primarily due to the formation of structural or surface imperfections during the fabrication, transfer or manipulation of the membrane. In addition, graphene possesses a low bending rigidity which inevitably leads to the out-of-plane crumpling of the film. So, determining the effect of these imperfections on the mechanics of graphene is critical to ensure development in the research field and application pertaining to graphene. The main focal point of this work is to experimentally determine the effects of surface corrugations, in the form of out-of-plane crumples, on the mechanical constants of the graphene membrane. In this study, two types of graphene membranes are considered, one is a flat membrane, and the other is a heavily crumpled membrane. The atomic force microscope is used to probe the membranes, and the mechanical constants are extracted from the resulting force deflection characteristics. The mechanical constants of the flat membrane, 2D Young’s modulus (E2D) and pretension (σ0) were found to be 140.42 ± 44.52 N/m and 0.119 ± 0.049 N/m respectively. The values obtained suggest a softening behaviour of the membranes, which is due to the intrinsic crumpling of the membrane in the out-of-plane direction. Surprisingly, in the case of heavily crumpled membranes, E2D and σ0 were found to be 393.34 ± 145.12 N/m and 0.203 ± 0.069 N/m respectively. The values obtained suggests that the heavily crumpled membranes provide greater resistance to deflection than the flat samples. However, it is essential to understand that the values do not depict the effective Young’s modulus or intrinsic strength of the membrane. The presence of folds in the heavily crumpled membranes is the reason for their higher resistance to deflection. The evolution of these folds, when subjected to nanoindentation, is also discussed in this work. This research helps provide insights into how the graphene membrane responds mechanically in the presence of crumples and also provides progress in realising the applications of crumpled graphene membranes.Mechanical Engineering | Dynamics of Micro and Nano System
Numerical solution of a nonlinear fractional model for hepatitis C by using Haar wavelets
No full textOptimization of wheel-rail interface friction using top-of-rail friction modifiers: State of the art
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