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Passive GNSS-based SAR imaging and opportunities using Galileo E5 signals

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Science China(Information Sciences) 2015年第6期58卷 84-94页

作者： MA Hui antoniou michail CHERNIAKOV Mikhail School of Electronic and Information Engineering Beihang University Electronic Electrical and Systems Engineering Department University of Birmingham

This paper investigates the feasibility of Galileo navigation satellites as transmitters of opportunity in passive bistatic synthetic aperture radar(SAR) systems from the perspectives of signal processing and experiment program. Experimental images obtained using a single Galileo channel, E5 a or E5 b, are presented and analyzed. The paper also puts forward the channel combination scheme to jointly process E5 a and E5 b channels, which brings up high-resolution possibilities for passive SAR technique. By employing the entire E5 band for imaging, the range resolution may be potentially increased by up to 5 times. Preliminary experimental results for this concept are demonstrated.

关键词： bistatic synthetic aperture radar(BSAR) GNSS-based SAR Galileo E5 channel combination

Space-surface bistatic synthetic aperture radar with navigation satellite transmissions: a review

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Science China(Information Sciences) 2015年第6期58卷 5-24页

作者： antoniou michail CHERNIAKOV Mikhail MA Hui Electronic Electrical and Systems Engineering Department University of Birmingham School of Electronic and Information Engineering Beihang University

This paper reviews the theory and practice of Space-Surface Bistatic Synthetic Aperture Radar(SS-BSAR) using navigation satellites as transmitters. In recent years, this innovative technology has reached a maturity stage which allows it to be considered for a wide range of applications. The paper covers the fundamental aspects of this technology as a radar system, such as the resolution, power budget and Point Spread Function(PSF) analysis, as well as its signal processing aspects and the state of the art in terms of advanced SAR techniques that it enables. Finally, the theoretical aspects of the paper may be directly transferred to the more generic SS-BSAR concept.

关键词： bistatic synthetic aperture radar GNSS-based SAR space-surface bistatic SAR coherent change detection multi-perspective imaging

GNSS-based BiSAR imaging using modified range migration algorithm

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Science China(Information Sciences) 2015年第8期58卷 144-156页

作者： ZENG Tao LIU FeiFeng antoniou michail CHERNIAKOV Mikhail Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology School of Electronic Electrical and Systems Engineering University of Birmingham

This paper proposed a new focusing approach for the bistatic SAR systems with a GNSS(Global Navigation Satellite System) satellite as the transmitter. Because of the long integration time the inherited curvature of the transmitter’s trajectory was adopted and the spatial variance of the equivalent velocity was derived under the principal of equivalent slant range model in the system signal model. The proposed focusing approach consists of two-step processing. Firstly, the general Doppler phase from constant velocity of the echo data is focused by modified Stolt mapping. Secondly, the residual nonlinear Doppler phase due to velocity variation is compensated by means of block-processing-based adaptive phase compensation to achieve large scene focusing. The simulation and experimental results validate the proposed algorithm in GNSS-based Bi SAR systems.

关键词： GNSS-based Bi SAR equivalent slant range model curvature of trajectory two-step processing modified Stolt mapping

DEM generation using bistatic interferometry:high-coherence pixel selection and residual reference phase compensation

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Science China(Information Sciences) 2015年第6期58卷 25-38页

作者： ZENG Tao ZHU Mao HU Cheng TIAN WeiMing antoniou michail Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology School of Electronic Electrical and Systems Engineering University of Birmingham

The bistatic spaceborne/stationary In SAR configuration could be applied to generate digital elevation model(DEM). However, two factors limit the DEM precision improvement. On one hand, due to the effects of the illuminator’s sidelobe and the high objects’ shadow, the pixels in the corresponding area might be polluted by the noise. On the other hand, owing to the presence of deviation(between the real value and the nominal value of the master/slave antenna positions), after utilizing the nominal value to compensate for the reference phase, the residual reference phase would remain. In order to solve the problems, we proposed a new bistatic DEM generation algorithm. Firstly, we applied the coherence-phase joint analysis method to select high-coherence points. Secondly, we deduced the transforming relationship from the deviation to the residual reference phase, and then compensated for the residual reference phase. In the experiment, the Yao Gan-3(an L-band spaceborne SAR) was selected as the transmitter and the two stationary receivers were mounted on the top of a tall building. The algorithm recommended in this paper was applied to process the measured bistatic data. The analysis of the results demonstrated that the elevation error of the generated DEM for some targets had been limited to the level of 1–2 m.

关键词： bistatic In SAR high coherence pixel DEM SAR bistatic SAR

Assessing the impacts of traffic calming at network level:A multimodal agent-based simulation

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Journal of Traffic and Transportation Engineering(English Edition) 2024年第1期11卷 41-54页

作者： Eftychia Zargiannaki Panagiotis G.Tzouras Eleni antoniou Christos Karolemeas Konstantinos Kepaptsoglou School of Rural Surveying and Geoinformatics EngineeringNational Technical University of AthensZografou 15780Greece

The reduction of speed limits in urban roads through traffic calming schemes intends to ensure safer traffic conditions among road users by reducing the probability related to the occurrence of severe *** it from a different perspective,traffic calming measures can potentially resolve congestion problems at the same time by lowering the overall accessibility and attractiveness of private cars in urban *** study proposes a new methodological approach to explore and assess the direct impacts of traffic calming in the transport system efficiency of a metropolitan *** multi-agent transport simulation(MATSim)and Open-Berlin scenario are utilized to perform this simulation *** developing a new external tool,the free flow speed and road capacity of each network link is updated based on new speed limits and different compliance rates,which are defined per road hierarchy *** test scenarios that are formulated present radical conditions,where the speed limit in most urban roads of Berlin drops to 30 km/h or even 15 km/*** findings of this study show a considerably high increase in trips,passenger hours,and passenger kilometers using public transport modes,when traffic calming links are introduced,the reserve change is observed in private cars *** the speed limits are decreased in inner urban roads in most of the scenarios,the decrease of average travel speed of private cars is not so high as it was ***,private cars are used for longer distances in all test *** drivers seem to use already existed motorways and private road to *** simulations,driver compliance to the new speed limits seems to be a determinant factor that is strongly influenced by the design interventions applied in a traffic calming area.

关键词： Agent-based simulation Traffic calming Impact assessment Urban road network

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Comprehensive and personalized approach is a critical area for developing remote cardiac rehabilitation programs

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World Journal of Clinical Cases 2024年第12期12卷 2009-2015页

作者： Garyfallia Pepera Varsamo antoniou Jing Jing Su Rose Lin Ladislav Batalik Clinical Exercise Physiology and Rehabilitation Research Laboratory Department of PhysiotherapyFaculty of Health SciencesUniversity of ThessalyLamia GR35100Greece School of Nursing The Hong Kong Polytechnic UniversityHong Kong 999077China University of Rochester School of Nursing New YorkNY 14602United States Department of Rehabilitation University Hospital BrnoBrno 62500Czech Republic Department of Public Health Faculty of MedicineMasaryk UniversityBrno 62500Czech Republic

In the evolving landscape of cardiac rehabilitation(CR),adopting digital technologies,including synchronous/real-time digital interventions and smart applications,has emerged as a transformative *** technologies offer realtime health data access,continuous vital sign monitoring,and personalized educational enhanced patient self-management and *** their potential benefits,challenges and limitations exist,necessitating careful ***/real-time digital CR involves remote,two-way audiovisual communication,addressing issues of accessibility and promoting home-based *** applications extend beyond traditional healthcare,providing real-time health data and fostering patient *** devices and mobile apps enable continuous monitoring,tracking of rehabilitation outcomes,and facilitate lifestyle modifications crucial for cardiac health *** digital CR progresses,ensuring patient access,equitable implementation,and addressing the digital divide becomes *** intelligence holds promise in the early detection of cardiac events and tailoring patient-specific CR ***,challenges such as digital literacy,data privacy,and security must be addressed to ensure inclusive ***,the shift toward digital CR raises concerns about cost,safety,and potential depersonalization of therapeutic relationships.A transformative shift towards technologically enabled CR necessitates further research,focusing not only on technological advancements but also on customization to meet diverse patient *** challenges related to cost,safety,data security,and potential depersonalization is crucial for the widespread adoption of digital *** studies should explore integrating moral values into digital therapeutic relationships and ensure that digital CR is accessible,equitable,and seamlessly integrated into routine cardiac *** frameworks that accommodate

关键词： Cardiac rehabilitation Digital approaches Remote care Equity in technology access Synchronous/real-time interventions Digital innovation in healthcare

Enhancement of endogenous midbrain neurogenesis by microneurotrophin BNN-20 after neural progenitor grafting in a mouse model of nigral degeneration

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Neural Regeneration Research 2024年第6期19卷 1318-1324页

作者： Theodora Mourtzi Nasia antoniou Christina Dimitriou Panagiotis Gkaravelas Georgia Athanasopoulou Panagiota Nti Kostantzo Olga Stathi Efthymia Theodorou Maria Anesti Rebecca Matsas Fevronia Angelatou Georgia Kouroupi Ilias Kazanis Laboratory of Developmental Biology Department of Biology University of Patras Laboratory of Cellular and Molecular Neurobiology-Stem Cells Hellenic Pasteur Institute 3. Department of Physiology School of Medicine University of Patras

We have previously shown the neuroprotective and pro-neurogenic activity of microneurotrophin BNN-20 in the substantia nigra of the “weaver” mouse, a model of progressive nigrostriatal degeneration. Here, we extended our investigation in two clinically-relevant ways. First, we assessed the effects of BNN-20 on human induced pluripotent stem cell-derived neural progenitor cells and neurons derived from healthy and parkinsonian donors. Second, we assessed if BNN-20 can boost the outcome of mouse neural progenitor cell intranigral transplantations in weaver mice, at late stages of degeneration. We found that BNN-20 has limited direct effects on cultured human induced pluripotent stem cell-derived neural progenitor cells, marginally enhancing their differentiation towards neurons and partially reversing the pathological phenotype of dopaminergic neurons generated from parkinsonian donors. In agreement, we found no effects of BNN-20 on the mouse neural progenitor cells grafted in the substantia nigra of weaver mice. However, the graft strongly induced an endogenous neurogenic response throughout the midbrain, which was significantly enhanced by the administration of microneurotrophin BNN-20. Our results provide straightforward evidence of the existence of an endogenous midbrain neurogenic system that can be specifically strengthened by BNN-20. Interestingly, the lack of major similar activity on cultured human induced pluripotent stem cell-derived neural progenitors and their progeny reveals the in vivo specificity of the aforementioned pro-neurogenic effect.

关键词： adult neurogenesis BNN-20 brain-derived neurotrophic factor cell replacement induced pluripotent stem cells (iPSCs) neurotrophic factors Parkinson's disease substantia

Manipulation of photosensory and circadian signaling restricts phenotypic plasticity in response to changing environmental conditions in Arabidopsis

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MOLECULAR PLANT 2024年第9期17卷 1458-1471页

作者： Battle, Martin William Ewing, Scott Fraser Dickson, Cathryn Obaje, Joseph Edgeworth, Kristen N. Bindbeutel, Rebecca antoniou-Kourounioti, Rea L. Nusinow, Dmitri A. Jones, Matthew Alan Univ Glasgow Sch Mol Biosci Plant Sci Grp Glasgow G12 8QQ Scotland Liverpool John Moores Univ Sch Biol & Environm Sci Liverpool L2 2QP England Danforth Plant Sci Ctr St Louis MO 63132 USA Washington Univ St Louis Div Biol & Biomed Sci St Louis MO 63130 USA

Plants exploit phenotypic plasticity to adapt their growth and development to prevailing environmental conditions. Interpretation of light and temperature signals is aided by the circadian system, which provides a temporal context. Phenotypic plasticity provides a selective and competitive advantage in nature but is obstructive during large-scale, intensive agricultural practices since economically important traits (including vegetative growth and flowering time) can vary widely depending on local environmental conditions. This prevents accurate prediction of harvesting times and produces a variable crop. In this study, we sought to restrict phenotypic plasticity and circadian regulation by manipulating signaling systems that govern plants' responses to environmental signals. Mathematical modeling of plant growth and development predicted reduced plant responses to changing environments when circadian and light signaling pathways were manipulated. We tested this prediction by utilizing a constitutively active allele of the plant photoreceptor phytochrome B, along with disruption of the circadian system via mutation of EARLY FLOWERING3. We found that these manipulations produced plants that are less responsive to light and temperature cues and thus fail to anticipate dawn. These engineered plants have uniform vegetative growth and flowering time, demonstrating how phenotypic plasticity can be limited while maintaining plant productivity. This has significant implications for future agriculture in both open fields and controlled environments.

关键词： circadian developmental plasticity phenotypic plasticity external coincidence light temperature PHYTOCHROME ELF3 CLOCK LIGHT PROTEIN PHOTOMORPHOGENESIS ALLELE CRYPTOCHROMES ENTRAINMENT PATHWAYS

Translation and cross-cultural adaptation of the Kidney Transplant Questionnaire 25 to Greek

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World Journal of Transplantation 2024年第2期14卷 148-154页

作者： Vasileios Koutlas Eirini Tzalavra Vasileios Tatsis Charalampos Pappas Stavroula Vovlianou Stefanos Bellos Anila Duni Eleni Stamellou Konstantinos I Tsamis michail Mitsis Evangelia Dounousi Department of Surgery and Kidney Transplant Unit University Hospital of IoanninaIoannina 45500EpirusGreece Department of Surgery Faculty of MedicineSchool of Health SciencesUniversity of IoanninaIoannina 45110EpirusGreece Department of Nephrology University Hospital of IoanninaIoannina 45500EpirusGreece Department of Nephrology General Hospital of KavalaKavala 65500Greece Department of Physiology Faculty of MedicineSchool of Health SciencesUniversity of IoanninaIoannina 45110EpirusGreece Department of Nephrology Faculty of MedicineSchool of Health SciencesUniversity of IoanninaIoannina 45110EpirusGreece

BACKGROUND Kidney transplantation leads to continuous improvement in the survival rates of kidney transplant recipients(KTRs)and has been established as the treatment of choice for patients with end-stage kidney ***-related quality of life(HRQoL)has become an important outcome *** is highly important to develop reliable methods to evaluate HRQoL with disease-specific *** To translate the disease-specific instrument Kidney Transplant Questionnaire 25(KTQ-25)to the Greek language and perform a cross-cultural *** The translation and adaptation of the original English version of the KTQ-25 to the Greek language were performed based on the International Quality of Life RESULTS Eighty-four KTRs(59 males;mean age 53.5±10.7 years;mean estimated glomerular filtration rate 47.7±15.1 mL/min/1.73 m2;mean transplant vintage 100.5±83.2 months)completed the Greek version of the KTQ-25 and the 36-item Short-Form Health Survey,and the results were used to evaluate the reliability of the Greek *** Cronbach alpha coefficients for all the KTQ-25 dimensions were satisfactory(physical symptoms=0.639,fatigue=0.856,uncertainty/fear=0.661,appearance=0.593,emotions=0.718,total score=0.708).The statistically significant correlation coefficients among the KTQ-25 dimensions ranged from 0.226 to *** correlation coeffi-cients of the KTQ-25 dimensions with the SF-36 physical component summary(PCS)ranged from 0.196 to 0.550;the correlation coefficients of the KTQ-25 with the SF-36 mental component summary(MCS)ranged from 0.260 to 0.655;and the correlation coefficients of the KTQ-25 with the total scores with the SF-36 PCS and MCS were 0.455 and 0.613,*** According to the findings,the Greek version of the KTQ-25 is valid and reliable for administration among kidney transplant patients in Greece.

关键词： Kidney Transplant Questionnaire 25 Kidney transplantation Kidney transplant recipients Health-related quality of life Quality of life