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Acquisition of Weak Signals in Multi-Constellation Frequency Domain Receivers

Positioning 2013年第2期4卷 144-152页

作者： kaveh mollaiyan Rock Santerre René Jr. Landry Department of Electrical Engineering école de Technologie Supérieure Montreal Canada Department of Geomatics Sciences Université Laval Quebec Canada Department of Electrical Engineering école de Technologie Supérieure Montreal Canada

New positioning applications’ availability requirements demand receivers with higher sensitivities and ability to process multiple GNSS signals. Possible applications include acquiring one signal per GNSS constellation in the same frequency band and combining them for increased sensitivity or predicting acquisition of other signals. Frequency domain processing can be used for this purpose, since it benefits from parallel processing capabilities of Fast Fourier Transform (FFT), which can be efficiently implemented in software receivers. On the other hand, long coherent integration times are mainly limited due to large FFT size in receivers using frequency domain techniques. A new method is proposed to address the problems in frequency domain receivers without compromising the resources and execution time. A pre-correlation accumulation (PCA) is proposed to partition the received samples into one-code-period blocks, and to sum them together. As a result, the noise is averaged out and the correlation results will gain more power, provided that the relative phase between the data segments is compensated for. In addition to simplicity, the proposed PCA method enables the use of one-size FFT for all integration times. A post-correlation peak combination is also proposed to remove the need for double buffering. The proposed methods are implemented in a configurable Simulink model, developed for acquiring recorded GNSS signals. For weak signal scenarios, a Spirent GPS simulator is used as a source. Acquisition results for GPS L1 C/A and GLONASS L1OF are shown and the performance of the proposed technique is discussed. The proposed techniques target GNSS receivers using frequency domain processing aiming at accommodating all the GNSS signals, while minimizing resource usage. They also apply to weak signal acquisition in frequency domain to answer the availability demand of today’s GNSS positioning applications.

关键词： FFT Acquisition Frequency Domain Receiver Weak Signal Multi-Constellation

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A functional tacrolimus-releasing nerve wrap for enhancing nerve regeneration following surgical nerve repair

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Neural Regeneration Research 2025年第1期20卷 291-304页

作者： Simeon C.Daeschler Katelyn J.W.So Konstantin Feinberg Marina Manoraj Jenny Cheung Jennifer Zhang kaveh Mirmoeini JPaul Santerre Tessa Gordon Gregory HBorschel SickKids Research Institute Neuroscience and Mental Health ProgramTorontoONCanada Institute of Biomaterials and Biomedical Engineering University of TorontoTorontoONCanada Indiana University School of Medicine IndianapolisINUSA Division of Plastic and Reconstructive Surgery the Hospital for Sick ChildrenTorontoONCanada Translational Biology and Engineering Program Ted Rogers Centre for Heart ResearchInstitute of Biomedical EngineeringFaculty of DentistryUniversity of TorontoTorontoONCanada

Axonal regeneration following surgical nerve repair is slow and often incomplete,resulting in poor functional recovery which sometimes contributes to lifelong ***,there are no FDA-approved therapies available to promote nerve *** accelerates axonal regeneration,but systemic side effects presently outweigh its potential benefits for peripheral nerve *** authors describe herein a biodegradable polyurethane-based drug delivery system for the sustained local release of tacrolimus at the nerve repair site,with suitable properties for scalable production and clinical application,aiming to promote nerve regeneration and functional recovery with minimal systemic drug *** is encapsulated into co-axially electrospun polycarbonate-urethane nanofibers to generate an implantable nerve wrap that releases therapeutic doses of bioactive tacrolimus over 31 *** and drug loading are adjustable for applications in small and large caliber nerves,and the wrap degrades within 120 days into biocompatible *** released from the nerve wrap promotes axon elongation in vitro and accelerates nerve regeneration and functional recovery in preclinical nerve repair models while off-target systemic drug exposure is reduced by 80%compared with systemic *** its surgical suitability and preclinical efficacy and safety,this system may provide a readily translatable approach to support axonal regeneration and recovery in patients undergoing nerve surgery.

关键词： biodegradable local drug delivery nerve injury nerve regeneration nerve wrap tacrolimus

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Superfunctional high-entropy alloys and ceramics by severe plastic deformation

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Rare Metals 2023年第10期42卷 3246-3268页

作者： Parisa Edalati Masayoshi Fuji kaveh Edalati Department of Life Science and Applied Chemistry Nagoya Institute of TechnologyTajimi507-0071Japan Advanced Ceramics Research Center Nagoya Institute of TechnologyTajimi507-0071Japan WPI International Institute for Carbon-Neutral Energy Research(WPI-I2CNER) Kyushu UniversityFukuoka819-0395Japan Mitsui Chemicals Inc.—Carbon Neutral Research Center(MCI-CNRC)Kyushu UniversityFukuoka819-0395Japan

High-entropy alloys and ceramics containing at least five principal elements have recently received high attention for various mechanical and functional *** application of severe plastic deformation(SPD),particularly the high-pressure torsion method,combined with the CALPHAD(calculation of phase diagram) and first-principles calculations resulted in the development of numerous superfunctional high-entropy materials with superior properties compared to the normal functions of engineering *** article reviews the recent advances in the application of SPD to developing superfunctional high-entropy *** superfunctional properties include(ⅰ) ultrahigh hardness levels comparable to the hardness of ceramics in high-entropy alloys,(ⅱ) high yield strength and good hydrogen embrittlement resistance in high-entropy alloys;(ⅲ) high strength,low elastic modulus,and high biocompatibility in high-entropy alloys,(ⅳ) fast and reversible hydrogen storage in high-entropy hydrides,(ⅴ) photovoltaic performance and photocurrent generation on high-entropy semiconductors,(ⅵ) photocatalytic oxygen and hydrogen production from water splitting on high-entropy oxides and oxynitrides,and(ⅶ)CO_(2) photoreduction on high-entropy *** findings introduce SPD as not only a processing tool to improve the properties of existing high-entropy materials but also as a synthesis tool to produce novel high-entropy materials with superior properties compared with conventional engineering materials.

关键词： Multi-principal element alloys(MPEAs) High-entropy alloys(HEAs) High-entropy ceramics(HECs) High-entropy oxides(HEOs) Ultrafine-grained(UFG)microstructure High-pressure torsion(HPT)

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Flood risk on arid alluvial fans:a case study in the Joghatay Mountains,Northeast Iran

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Journal of Mountain Science 2023年第5期20卷 1183-1200页

作者： kaveh GHAHRAMAN Balázs NAGY Department of Physical Geography Eotvos Loránd UniversityPázmány Péter stny.1/CH-1117 BudapestHungary

Among the common hazards related to alluvial fans,flooding is one of the most ***,in populated alluvial fans,not only the natural processes are effective in floods,but the artificial structures and modifications can change the behavior of flooding and its potential *** study aims to indicate the flood-prone landforms in a set of populated alluvial fans in an arid region and investigate the role of anthropogenic activities in controlling/exacerbating flooding in alluvial *** achieve this goal,15 Ground Range Detected in High resolution(GRDH)SAR Sentinel-1 images,covering a total of 24 alluvial fans,were ***-processing and post-processing steps were applied to all images to identify flood-prone sections of the studied alluvial *** results showed that feeder channels,spreading sites,and wide interfluves are the most flood-prone landforms of alluvial *** terms of anthropogenic modifications to mitigate flooding,a rampart system is distributed in the study *** are levee like structures formed from the fan *** aim to mitigate flood hazard on residential areas,infrastructures,and agricultural lands of the study *** show that the rampart system can reduce the danger of floods,but it cannot be considered a long-term ***,a comprehensive flood protection system distributed throughout the whole alluvial fan system is *** also reveal that in regions where flood monitoring is challenging,SAR images can be used as a freely available data set to monitor and identify flooding hotspots.

关键词： Alluvial fan Flood Anthropogenic activities Rampart Sentineli SAR

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Study on failure mechanism of room and pillar with different shapes and configurations under uniaxial test and numerical simulation compression using experimental test and numerical simulation

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Underground Space 2023年第2期9卷 105-121页

作者： Vahab Sarfarazi Nima Babanouri Shahin Fattahi kaveh Asgari Department of Mining Engineering Hamedan University of TechnologyHamedanIran Department of Mining Engineering Shahid Bahonar University of KermanKermanIran

Experimental and discrete element methods were used to investigate the failure behavior of room and pillar with different configura-tions under uniaxial *** samples with dimension of 15 cm×15 cm×5 cm were *** the specimens,rooms and pillars with different configurations were *** room dimension was 1 cm×1 cm,and the pillar dimension was according to the room *** different configurations were chosen for rooms and *** axial load was applied to the model by rate of 0.05 mm/*** results show that the failure process was mostly governed by both the non-persistent joint angle and joint *** compressive strength of the specimens was related to the fracture pattern and failure mechanism of the *** was shown that the shear behaviour of pillars was related to the number of the induced tensile cracks,which increased by increasing the room *** compressive strength of samples increased with the increase of the room *** failure pattern and failure strength are similar in both methods,i.e.,the experimental testing and the numerical simulation.

关键词： PFC2D Physical test Rock pillar

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NAFLD or MAFLD:the data behind the debate

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Hepatobiliary Surgery and Nutrition 2022年第3期11卷 439-442页

作者： Frederick Yick kaveh Hajifathalian Department of Gastroenterology and Hepatology Rutgers New Jersey Medical SchoolNewarkNJUSA

Since its introduction in the 1980s(1),there has been substantial growth in the knowledge of non-alcoholic fatty liver disease/non-alcoholic steatohepatitis(NAFLD/NASH).This is of utmost importance as the disease burden of NAFLD has grown globally as evidenced by its increase in disability-adjusted life-years when compared to other causes for liver disease regardless of region(2).However,despite great advances,there has been discontent with the nomenclature as it may not perfectly capture this heterogeneous disease *** response,an international panel proposed replacing NAFLD/NASH with metabolic(dysfunction)associated fatty liver disease(MAFLD)(3).In MAFLD,diagnosis would focus more on presence of risk factors contributing to metabolic dysfunction in the presence of fatty liver,as opposed to just the exclusion of high alcohol *** is noted that although most patients with hepatic steatosis who currently carry the diagnosis of NAFLD likely would also meet the criteria for MAFLD.

关键词： NAFLD diagnosis likely

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MCRO-PUF:A Novel Modified Crossover RO-PUF with an Ultra-Expanded CRP Space

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Computers, Materials & Continua 2023年第3期74卷 4831-4845页

作者： Hassan Rabiei Masoud kaveh Mohammad Reza Mosavi Diego Martín Department of Electrical Engineering Iran University of Science and TechnologyTehran13114-16846Iran Department of Communication and Networking Aalto UniversityEspoo00076Finland ETSI de Telecomunicación Universidad Politécnica de MadridAv.Complutense 30Madrid28040Spain

With the expanding use of the Internet of Things(IoT)devices and the connection of humans and devices to the Internet,the need to provide security in this field is constantly *** conventional cryptographic solutions need the IoT device to store secret keys in its non-volatile memory(NVM)leading the system to be vulnerable to physical *** addition,they are not appropriate for IoT applications due to their complex ***,physically unclonable functions(PUFs)have been introduced to simultaneously address these *** are lightweight and easy-toaccess hardware security primitives which employ the unique characteristics of integrated circuits(ICs)to generate secret *** all proposed PUFs,ring oscillator PUF(RO-PUF)has had amore suitable structure for hardware implementation because of its high reliability and easier providing of circuital ***,RO-PUF has not been so attractive for authentication purposes due to its limited supported challenge-response pairs(CRPs).A few efforts have been made in recent years that could successfully improve the RO-PUF CRP space,such as configurable RO-PUF(CRO-PUF).In this paper,by considerably improving the CRO-PUF structure and adding spare paths,we propose a novel strong RO-PUF structure that exponentially grows the CRP space and dramatically reduces the hardware *** implement our design on a simple and low-cost FPGA chip named XC6SLX9-2tqg144,stating that the proposed design can be used in IoT *** addition,to improve the CRP space,our design creates a suitable improvement in different security/performance terms of the generated responses,and dramatically outperforms the *** average reliability,uniqueness,and uniformity of the responses generated are 99.55%,48.49%,and 50.99%,respectively.

关键词： RO-PUF CRP space configurable design

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Impact of occupant autonomy on satisfaction and building energy efficiency

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Energy and Built Environment 2023年第4期4卷 377-385页

作者： Wipa Loengbudnark kaveh Khalilpour Gnana Bharathy Alexey Voinov Leena Thomas Center on Persuasive Systems for Wise Adaptive Living Faculty of Engineering&ITUniversity of Technology SydneyNSW 2007Australia School of Architecture Faculty of DesignArchitecture and BuildingUniversity of Technology SydneyNSW 2007Australia Faculty of Engineering Technology University of Twentethe Netherlands

The philosophy of building energy management is going through a paradigm change from traditional,often inefficient,user-controlled systems to one that is centrally automated with the aid of IoT-enabled *** this context,occupants’perceived control and building automation may seem to be in *** inquiry of this study is rooted in a proposition that while building automation and centralized control systems are assumed to provide indoor comfort and conserve energy use,limiting occupants’control over their work environment may result in dissatisfaction,and in turn decrease *** assessing this hypothesis,data from the post-occupancy evaluation survey of a smart building in a university in Australia was used to analyze the relationships between perceived control,satisfaction,and perceived *** structural equation modeling,we have found a positive direct effect of occupants’perceived control on overall satisfaction with their working ***,perceived control exerts an influence on perceived productivity through ***,a field experiment conducted in the same building revealed the potential impact that occupant controllability can have on energy *** changed the default light settings from automatic on-and-offto manual-on and automatic-off,letting occupants choose themselves whether to switch the light on or ***,about half of the participants usually kept the lights off,preferring daylight in their *** also resulted in a reduction in lighting electricity use by 17.8%without any upfront investment and major technical *** findings emphasize the important role of perceived control on occupant satisfaction and productivity,as well as on the energy-saving potential of the user-in-the-loop automation of buildings.

关键词： Autonomy Occupant behavior Comfort preference Building energy management Human-in-the-loop automation

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Role of Cannabinoid CB1 Receptor in Object Recognition Memory Impairment in Chronically Rapid Eye Movement Sleep-deprived Rats

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Chinese Medical Sciences Journal 2023年第1期38卷 29-37页

作者： kaveh Shahveisi Seyedeh Marziyeh Hadi Hamed Ghazvini Mehdi Khodamoradi Sleep Disorders Research Center Kermanshah University of Medical SciencesKermanshah ***Iran Faculty of Medicine Kermanshah University of Medical SciencesKermanshah ***Iran Psychiatry and Behavioral Sciences Research Center Addiction InstituteMazandaran University of Medical SciencesSari 48175866Iran Department of Neuroscience School of Advanced Technologies in MedicineMazandaran University of Medical SciencesSari 48175866Iran Substance Abuse Prevention Research Center Health InstituteKermanshah University of Medical SciencesKermanshah ***Iran

Objective We aimed to investigate whether antagonism of the cannabinoid CB1 receptor(CB1R)could affect novel object recognition(NOR)memory in chronically rapid eye movement sleep-deprived(RSD)*** The animals were examined for recognition memory following a 7-day chronic partial RSD paradigm using the multiple platform *** CB1R antagonist rimonabant(1 or 3 mg/kg,i.p.)was administered either at one hour prior to the sample phase for acquisition,or immediately after the sample phase for consolidation,or at one hour before the test phase for retrieval of NOR *** the reconsolidation task,rimonabant was administered immediately after the second sample *** The RSD episode impaired acquisition,consolidation,and retrieval,but it did not affect the reconsolidation of NOR *** administration did not affect acquisition,consolidation,and reconsolidation;however,it attenuated impairment of the retrieval of NOR memory induced by chronic *** These findings,along with our previous report,would seem to suggest that RSD may affect different phases of recognition memory based on its ***,it seems that the CB1R may,at least in part,be involved in the adverse effects of chronic RSD on the retrieval,but not in the acquisition,consolidation,and reconsolidation,of NOR memory.

关键词： REM sleep deprivation novel object recognition memory cannabinoid CB1 receptor rimonabant

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Physicochemical properties of silver carp(Hypophthalmichthys molitrix)mince sausages as influenced by washing and frozen storage

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Aquaculture and Fisheries 2023年第4期8卷 403-409页

作者： kaveh Rahmanifarah Joe M.Regenstein Mehdi Nikoo Department of Pathobiology and Quality Control Artemia and Aquaculture Research InstituteUrmia UniversityUrmiaWest Azerbaijan57179-44514Iran Department of Food Science Cornell UniversityIthacaNY14853-7201USA

Frozen storage of emulsion-type sausages may be one approach to avoid or reduce the use of sodium nitrite,which is associated with health *** carp(Hypophthalmichthys molitrix)mince(M_(0))was washed for 1(M_(1))or 3(M_(3))times and the impact of washing on the properties frozen storage(−18℃)during 4 months were determined and results were compared to those of conventional silver carp sausages(Mt).Lipid oxidation,as evidenced by changes in thiobarbituric acid reactive substances and FFAs,took place during storage in the order of M_(0)>M_(1)=M_(3)=Mt with M_(0)being highly oxidized(P≤0.05).Total volatile base nitrogen formed during storage and the ranking for the quality loss was as follows M_(0)>M_(1)>M_(3)=***(M_(1)=M_(3))led to less hardness(P≤0.05).Mt had better redness,while M_(1)and M_(3)led to higher expressible moisture,water release and lightness(P≤0.05).Results indicated the lower sensory and consumer-liking properties of frozen M_(1)and M_(3)***,washing and frozen storage influenced silver carp mince sausages.

关键词： Frozen storage Emulsion-type sausages Hypophthalmichthys molitrix Minced fish

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