The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In this paper, a breast cancer detection system is proposed. The system consists of 24 wideband printed inverted-F antennas. The reflection and transmission coefficients of the wideband printed inverted-F antennas are compared to the conventional one. The proposed system has uniform reception level from 0.6GHz to 4.0GHz.
A time-domain inverse scattering approach using time-reversed fields for reconstructing electrical parameters of cylindrical objects based on gradient method is proposed. The approach does not require the explicit knowledge of incident fields illuminating the object and the time-reversed fields are calculated by time-reversing the equivalent current sources determined by the total fields recorded...
An inverse scattering problem of determining the electrical property of an unknown dielectric object is considered. The electromagnetic wave generated by an impressed electric current with a short duration time illuminates the dielectric object. The measured data of the total field, the sum of the incident and scattered fields, over an observation surface S is used to reconstruct the electrical property...
Time reversal imaging methods have received considerable attention since they yield accurate location estimate of point scatterers. Up to now, most time reversal methods have focused on detection and localization of point-like or small targets [1, 2] and not dealt with estimation of electrical parameter profile of scatterers. We have proposed a gradient based time-reversal imaging technique which...
Forward-Backward Time-Stepping Method (FBTS method) is a technique to solve time domain inverse scattering problem. An incident pulse is radiated to unknown object. The scattering wave is measured at M points. A similar measurement is carried out at N different incident points. Total number of measured data is M × N. In FBTS method, the estimated field is calculated by FDTD method. The number of calculation...
Power analysis for IoT devices is strongly required to reduce power consumption and realize secure communications. In this paper, we propose a scalable and small-sized power analyzer with signal-averaging noise reduction for low-power IoT devices. The proposed power analyzer reduces a wide frequency range of noises by using a signal averaging method and is implemented on just a 2cmx3cm board, which...
Power analysis for IoT devices is strongly required to reduce power consumption and realize secure communications, where we need a small-sized power analyzer that can reduce a wide frequency range of noises is needed. In this paper, we propose a small-sized and noise-reduced power analyzer for IoT devices. We utilize a signal averaging method to reduce a wide frequency range of noises. At that time,...
A new forward-backward time-stepping (FBTS) method using gradient-based optimization method has been proposed for inverse scattering problems. This method is based on the field equivalence principle and does not require the explicit knowledge of the incident field. Due to the nonlinearity of the inverse scattering problem, the solution based on gradient methods often gets trapped into a local minimum...
This paper introduces an example of real-time “big data” processing systems accelerated by field-programmable gate arrays (FPGAs), which will open up a novel design field for digital circuit engineers. Contrary to the perception that software on commodity servers dominates such large-scale processing requirements, there are various chances for utilizing hardware for the acceleration. One of the most...
As the volume of data that web services handle is becoming larger, many web service providers are utilizing memcached, an in-memory key-value store to improve their web server's performance. While memcached usually runs on a server with a high performance processor, various hardware platforms has been evaluated for running memcached in order to achieve higher performance. Recently, several works that...
Memcached is a technology that improves response speed of web servers by caching data on DRAMs in distributed servers. In order to achieve higher performance, memcached has been evaluated on various platforms. Among them, FPGA seems to be the most efficient platform to run memcached, and several research groups are trying to achieve higher throughput with it. However, it is difficult to utilize a...
A novel gradient-based inverse scattering method for imaging inhomogeneous objects from time-domain data of only total electric field is presented. Unlike most inverse scattering methods, the proposed method does not require the explicit information of the incident field illuminating a region of interest. Numerical simulations demonstrate the effectiveness of the method.
A critical source of information in automated trading is provided by market data feeds from financial exchanges. Two identical feeds, known as the A and B feeds, are used in reducing message loss. This paper presents a reconfigurable acceleration approach to A/B arbitration, operating at the network level, and supporting any messaging protocol. The key challenges are: providing efficient, low latency...
A time-domain inverse scattering approach using time-reversed fields for reconstructing electrical parameters of cylindrical objects has been proposed in a previous work. The approach does not require the explicit knowledge of incident fields illuminating the object. The cost functional represented in terms of the time-reversed fields was minimized by a genetic algorithm (GA). In this paper, we propose...
This presentation discusses on the comparison between "Reconfigurable Chip with High Level Synthesis" and "CPU, GPCPU with compiler such as CUDA" from the compiler perspective. Initially, we introduce several demands for acceleration with FPGA to achieve low latency calculation and control. As an application example, we show a High Frequency Trading. We accelerate it by FPGA NIC...
Messages are transmitted from financial exchanges to update their members about changes in the market. As UDP packets are used for message transmission, members subscribe to two identical message feeds from the exchange to lower the risk of message loss or delay. As financial trades can be time sensitive, low latency arbitration between these market data feeds is of particular importance. Members...
A time-domain inverse scattering approach based on the field equivalence principle is developed for reconstructing the electrical parameters of an unknown object using the tangential components of the electric field measured in presence and absence of the object. Numerical simulations demonstrate the effectiveness of the approach.
A time-reversal approach to reconstructing the electrical parameters of an inhomogeneous object from measured total field data is considered. It is shown that the approach does not require the information of the incident field in the region of interest enclosing the object when the primary source is placed outside of the region. Numerical simulations are performed to validate the effectiveness of...
This brief presents an efficient complex event-processing framework, designed to process a large number of sequential events on field-programmable gate arrays (FPGAs). Unlike conventional structured query language based approaches, our approach features logic automation constructed with a new C-based event language that supports regular expressions on the basis of C functions, so that a wide variety...
In this paper, time-domain inverse-scattering technique referred to as Forward-Backward Time-Stepping (FBTS) method is applied to microwave imaging breast cancer detection. The FBTS algorithm is implemented in C++ language executed in a single computer by developing the time domain form of the FDTD. The ability to detect as small as 4mm of the embedded tumour and reconstructing the image in two-dimensional...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.