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[IEEE IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Valencia (2018.7.22-2018.7.27)] IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - End-to-End Simulator of Geosynchronous SAR Data for System Performance Assessment
摘要： The paper describes an end-to-end simulator for Geosynchronous SAR data. The tool is composed of two modules: a raw data time domain simulator and a processor for the generation of the L1 products. The simulated raw data include the effects of atmospheric and clutter decorrelation. The end-to-end simulator is a powerful and flexible tool to be used during the system design phase for the verification of the expected performance.
关键词： APS,clutter,decorrelation,Geosynchronous SAR,end-to-end simulator
更新于2025-09-23 15:23:52
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Development of Monitoring Method of Respiratory Waveform in Thoracicoabdominal Part Using Web Camera; ウェブカメラを用いた胸腹部呼吸波形のモニタリング法の開発;
摘要： Countermeasures against respiratory movement are important for tumors of thorax and abdomen in stereotactic body radiation therapy. In the present paper, a web-camera-based-respiratory monitoring method without contact with patient's body was proposed for respiratory study. Thoracic and abdominal motion images were taken by a web camera, and were analyzed using simple image-processing techniques for obtaining respiratory waveforms. Four motion images with different respiration rate were obtained from resuscianne simulator. Respiration waveforms were estimated from the moving images by the proposed method, and were compared with respiration waveforms obtained by the conventional respiratory monitoring device. That was found to have a strong correlation. In addition, the two waveforms were similar in Bland–Altman method comparison. The proposed method can provide non-contact, non-invasive, simple, and realistic respiratory monitoring system for radiotherapy.
关键词： motion image analysis,resuscianne simulator,respiratory movement,radiation therapy,breath waveform
更新于2025-09-23 15:23:52
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A study of the effects of ullage during the burning of horizontal PMMA and MMA surfaces
摘要： Experimental and numerical investigations of burning of horizontal surfaces of poly methyl methacrylate and methyl methacrylate are presented. A burner used in this study allows for the fuel surface to be oriented horizontally at a given distance from the burner rim. One of the aims of this study is to understand the effects of ullage (distance between burner rim and fuel surface) on the burning rate of the fuel and the flame structure. In the case of poly methyl methacrylate, the surface at an initial ullage regresses during its burning, and in the case of methyl methacrylate, the pool level is maintained at the given ullage by supplying the fuel at the rate of its burning. Careful repeatable measurements of temperature and species fields are carried out. These reveal the structure of a small‐scale pool flame established over a polymeric fluid such as methyl methacrylate, and such data are scarce in literature. In order to complement the experimental results, fire dynamics simulator is employed to simulate the experimental cases. Flame structure and flow field in the gas phase have been presented and discussed. As the ullage increases, the burning rate decreases. This trend is explained using surface convective heat flux results.
关键词： fire dynamics simulator (FDS),convective heat flux,burning rate,poly methyl methacrylate (PMMA),flame structure,ullage
更新于2025-09-23 15:23:52
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[IEEE 2017 19th European Conference on Power Electronics and Applications (EPE'17 ECCE Europe) - Warsaw (2017.9.11-2017.9.14)] 2017 19th European Conference on Power Electronics and Applications (EPE'17 ECCE Europe) - Improvements of switching energy of SiC transistor with respect of chip integrity and EMC standards
摘要： This paper deals with the reduction of the switching energy losses of a SiC transistor by boosting its gate current. Notoriously, wide band-gap semiconductor transistors exhibit very fast switching performances, which provoke undesirables oscillations at high frequencies. An auxiliary circuit, located at the semiconductor device terminals, is developed to limit the electrical stresses, deleterious for the transistor integrity, and to reduce the EMC conducted interferences without modifying the current and voltage slopes during the switching transition. Firstly, the SiC MosFET is characterized on SABER environment from MosFET template available on the library. The behavior of the obtained model is compared with Model Architect tool, available in the same environment. Experimental tests are carried out and confirm the behaviors predicted by simulation. The obtained results underlines the good accuracy and the merits of the simulation model developed in this work, despite the use of the power transistor in a complex configuration.
关键词： SABER Simulator,EMC,Simulation Model of SiC transistor,Laminar Bus Bar
更新于2025-09-23 15:22:29
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Sun Simulators: Development of an Innovative Low Cost Film Filter
摘要： Sun simulators are employed to test the performance of photovoltaic (PV) devices, according to the standard International Electrotechnical Commission (IEC) 61215. Economical and technical analysis show that PV manufacturers need to integrate Sun simulators in the production process and, in particular, at the end of the production chain in order to measure the I-V curve and to evaluate the peak power of PV devices. Sun simulators need specific lamps to simulate the solar spectrum and a specific filter to simulate atmosphere absorbance. Such a filter can cost over €6 per square centimeter. The aim of this work is to develop an alternative filter. In particular, both chemical analysis and spectrophotometric measurements are carried out to evaluate if the Air Mass (AM) 1.5 G filter can be replaced by a cheaper material. Preliminary simulations show how specific compounds coated on a glass surface can absorb the Sun spectrum, such as the AM 1.5 filter, but with lower costs.
关键词： filter,PV components,film,sun simulator
更新于2025-09-23 15:22:29
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Simulateur de chirurgie de cataracte EyeSi?: validité de construction des modules capsulorhexis, phacoémulsification et aspiration des masses cristalliniennes
摘要： Introduction. — Le but de notre étude est de tester la capacité du simulateur EyeSi à discriminer les chirurgiens novices des chirurgiens expérimentés lors de la réalisation des exercices de 3 modules de formation à la chirurgie de cataracte, afin de confirmer sa validité de construction pour ceux-ci. Matériels et méthode. — Nous avons inclus 18 chirurgiens répartis en 3 groupes : les ? novices ? (6 internes n’ayant jamais opéré de cataracte), les ? intermédiaires ? (6 internes ayant opéré entre 1 et 10 cataractes) et les ? experts ? (6 chirurgiens ayant opéré plus de 500 cataractes). Nous avons sélectionné 3 modules d’entra?nement du simulateur, le capsulorhexis, la phacoémulsification-cracking et l’aspiration des masses cristalliniennes résiduelles. Douze exercices de difficulté croissante ont été réalisés 2 fois de suite par chaque participant. Nous avons comparé les résultats du 2ème essai en stratifiant sur l’expérience du chirurgien. Résultats. — Pour le module capsulorhexis, dans l’exercice 1, les experts obtiennent des scores plus élevés que les 2 autres groupes (p = 0,0102). Pour le module phacoémulsification-cracking, les experts ont des scores significativement supérieurs dans l’exercice 8 (p = 0,0495) et il existe une tendance à la significativité dans les exercices 3 (p = 0,0934) et 5 (p = 0,0938). Le temps de réalisation de l’exercice décro?t également en fonction du niveau d’expérience dans les exercices 1 (p = 0,0444), 4 (p = 0,06) et 5 (p = 0,0189). Conclusion. — Nos résultats mettent en évidence de meilleurs résultats du groupe experts pour 4 exercices des modules capsulorhexis et phacoémulsification-cracking. Ceci confirme la validité de construction du simulateur EyeSi pour la chirurgie de cataracte déjà mise en évidence par d’autres travaux. Notre étude permettra de contribuer à la réalisation de programmes de formation pertinents sur simulateur pour les internes en ophtalmologie.
关键词： Irrigation and aspiration,Capsulorhexis,Cataract surgery,EyeSi cataract surgery simulator,Construct validity,Phacoemulsification,Systematic training program
更新于2025-09-23 15:22:29
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[IEEE 2018 International Conference on Current Trends towards Converging Technologies (ICCTCT) - Coimbatore (2018.3.1-2018.3.3)] 2018 International Conference on Current Trends towards Converging Technologies (ICCTCT) - Generation and Analyzation of Spectral Density for IRNSS SPS PRN Code
摘要： The Indian Regional Navigational Satellite System (IRNSS) satellites provide two services namely standard Positioning Service (SPS) and Restricted Service (RS). L5 and S are the frequency bands from which both the services are utilized. To transmit the navigational information in SPS downlink gold codes are used. Most of the GNSS will work on the principle of CDMA where PRN sequences are the heart of the system. In this paper Pseudo Random Noise (PRN) codes are generated for an SPS signal which is called as SPS PRN code. A CDMA signal is generated using these sequences by using BPSK modulation. The analysis is done based on a time domain signal basis and is used to derive the Power Spectral Density of a CDMA signal. The spectrum analyser optimal operating conditions are observed by using the analytical results. To generate these codes, the polynomials G1 & G2 are selected, which are similar to ones used by GPS C/A signal and are as per the pre-conditions provided in IRNSS_SPS_ICD_June 2014. This paper also covers the process of selection of codes to be computed and the properties of PN-sequence are also analysed. The Xilinx ISE test system and Mat lab apparatus were used for the simulation of SPS PRN codes and additionally the implementation of PRN code is done on FPGA hardware wherein positive results have been obtained. These obtained simulated test results are within the theoretical limits.
关键词： ISE SIMULATOR,FPGA,CDMA,CORRELATION,PRN CODE
更新于2025-09-23 15:22:29
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[IEEE 2018 IEEE Energy Conversion Congress and Exposition (ECCE) - Portland, OR, USA (2018.9.23-2018.9.27)] 2018 IEEE Energy Conversion Congress and Exposition (ECCE) - Universal Control Strategy using Operating Point Projection Technique for Solar Array Hardware Emulation
摘要： Solar array simulator (SAS) is a special DC power supply that regulates the output voltage or current to emulate characteristics of photovoltaic (PV) panels. Especially, the control of SAS is a challenging task due to the nonlinearity in the output curve, which is dependent on irradiance as well as temperature and is determined by panel materials. Conventionally, both current-mode control and voltage-mode control should be alternated by partitioning the operating curve into multiple sections, which is not only for the measurement noise problem with the feedback sensing but also for the control stability issue near the maximum power point. However, the occurrence of transition among different controllers may deteriorate the overall performance. To eliminate the mode transitions, a novel single controller scheme has been introduced in this paper, where the operating point projection technique enables simple, smooth and numerically stable control. Theoretical consideration on the loop stability issue is discussed and the performance is verified experimentally for the emulation of a PV panel data in view of stability and response speed.
关键词： Photovoltaic systems,Solar array simulator,Feedback control,Solar power
更新于2025-09-23 15:22:29
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[IEEE 2018 41st International Conference on Telecommunications and Signal Processing (TSP) - Athens, Greece (2018.7.4-2018.7.6)] 2018 41st International Conference on Telecommunications and Signal Processing (TSP) - Modeling Electromagnetic Wireless Nanonetworks in Terahertz Band within NS-3 Platform
摘要： The wireless nanosensor network paradigm has seen a dramatic increase over the last decade. The envisioned concept uses the integrated machines (devices) at the nano-scale level. Those devices interact on a cooperative basis by means of principles known in wireless communication networks. Today, the design of the protocol stack for wireless nanosensor networks represents the crucial issue to be addressed. Currently available tools only support molecular-based approaches without the ability to account for the relevant impact that electromagnetic communications may have in this field. To cover this white spot, in this paper, the theoretical comparison of available simulation tools is given. Further, we focus on the Nano-Sim tool and create the scenario for wireless sensor networks (WNSN) based on electromagnetic communication in terahertz band.
关键词： Nanonetworks,Network Simulator 3,Simulation tools,Performance evaluation,Molecular communication
更新于2025-09-23 15:22:29
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A universal solar simulator for focused and collimated beams
摘要： This paper presents a 70 kWe indoor solar simulator for concentrating and non-concentrating (quasi-collimated light) solar applications. Three major subsystems compose this solar simulator: a lamp array, an optical integrator, and a collimating mirror. The lamp array consists of seven radiation modules, each comprising a 10 kWe xenon short-arc lamp coupled to a custom-designed re?ector in the shape of a truncated ellipsoid. The optical integrator and collimating mirror are applied to homogenize the intensity distribution of light and ?x the light angle. The solar simulator can continuously produce concentrated high-?ux, medium-?ux and non-concentrating quasi-collimated sunlight. For a focal plane with a 60 mm diameter circular target, the measured peak and mean radiative ?ux are 9200 kW/m2 and 5100 kW/m2, respectively, and the corresponding radiation power is 14.45 kW. For a 4 × 3 m rectangular quasi-collimated light area, the measured radiative ?ux, half divergence angle, and uniformity of the light are 0.94 kW/m2, 1.3°, and 92%, respectively. At 30% of the rated power output, the temperature of the parabolic trough receiver increases to 350 °C; while at 80% of the rated power output, the focused radiation can easily melt the metal of tantalum (in a quartz reactor), which corresponds to a melting temperature of more than 3290 K. The solar simulator can continuously produce concentrated high-?ux, medium-?ux and non-concentrating sunlight, which can serve as a universal experimental platform for solar energy research.
关键词： Universal,Solar energy,Focused,Solar simulator,Collimated
更新于2025-09-23 15:21:21