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.
This paper explores new applications for antenna impedance matching networks. It is seen that a tunable matching network can improve the cell phone system noise figure and total integrated sensitivity (TIS) by at ∼ 1 dB at 700 MHz – 3 GHz. The reason is that a mismatched low-noise amplifier has a higher noise figure and a lower gain than a noise-matched LNA, and therefore, a tunable matching network...
Programming a network for innovative services or for function improvements has never been easier using Software-Defined Networking (SDN). However, the programming tasks can also be significantly complicated by the asynchrony of data plane states and complexities of service control states. In order to reduce the complexity for programming a network service in Distributed Control Plane of SDN, we propose...
X-ray computed tomography is an important technique for clinical diagnose and non destructive testing. In many applications a number of image processing steps are needed before the image information can be used. Obtaining a segmentation of the image is one such image processing step and also is important for applications. The conventional approach is to first reconstruct the image and conduct image...
Chinese high-speed railway is undergoing a very vast development in recent years. How to efficiently maintain the high-speed railway system becomes an urgent task faced by the railway operator. In this paper, we study the random failure model of high-speed railway equipments in China, based on the statistical analysis of the real data of failure records. Several classical distribution functions for...
In order to improve service execution in Clouds, the management of Cloud Infrastructure has to take measures to adhere to Service Level Agreements and Business Level Objectives, from the application layer through to how services are supported at the lowest hardware levels. In this paper a risk model methodology and holistic management approach is developed specific to the operation of the Cloud Infrastructure...
Traffic grooming technique is one of the important candidates to save energy for networks. In order to minimize the energy consumption using Integer Linear Program (ILP) or Mixed Integer Linear Program (MILP), the assumption has to be made that all the connection requests are accepted in the IP over WDM network. However, a connection request may be blocked in a real network. In this paper, a bi-objective...
With the rapid development of Internet technology, information resources on the Internet become more abundant, but also bring some problems like diversity, heterogeneity, disorder, and redundancy. Given a brief expression like search keywords only, users' needs are ambiguous. Therefore, current technologies of search applications relying on direct keyword matching cannot meet the requirements of users...
In this paper, we propose an improved decoding algorithm for tail-biting convolutional codes (TBCC), which combines the maximum a posteriori (MAP) algorithm and the ordered statistics decoding (OSD). The cyclic redundancy check (CRC) code used as a outer code in long term evolution (LTE) systems can be involved into the proposed decoding algorithm to get a better performance. Since CRC loses its ability...
In this paper, we proposed an efficient shuffled-turbo receiver for the downlink transmission in the long term evolution (LTE) systems. Different with the conventional ones, all modules in the shuffled-turbo receiver work simultaneously. Improved hardware utilization and processing efficiency are achieved owing to this workflow. Besides, our receiver can adaptively support various scenarios with flexible...
This paper proposes to learn a discriminative dictionary for saliency detection. In addition to the conventional sparse coding mechanism that learns a representational dictionary of natural images for saliency prediction, this work uses supervised information from eye tracking experiments in training to enhance the discriminative power of the learned dictionary. Furthermore, we explicitly model saliency...
Load tests ensure that software systems are able to perform under the expected workloads. The current state of load test analysis requires significant manual review of performance counters and execution logs, and a high degree of system-specific expertise. In particular, memory-related issues (e.g., memory leaks or spikes), which may degrade performance and cause crashes, are difficult to diagnose...
To realize efficient solution of complicated multi-scale conducting objects, non-conformal, non-overlapped integral equation based domain decomposition method (IE-DDM) is developed. Based on Robin transmission condition, the normal continuity of surface currents on non-conformal touching faces is maintained. Different fast solvers like multilevel fast multipole algorithm, adaptive cross approximation...
This paper introduces a novel software and hardware co-design flow using a co-simulator and a co-verifier platform. In the new design platform, different hardware failures can be injected automatically to test the software protection on potential unsafe behavior of the hardware. The structure of the system is introduced in part II of this paper. In part III&IV, we take a simple circuit as an example...
A systematic numerical algorithm is proposed for the planning and optimization of wireless communication network in urban rail transportation. The algorithm is based on a few statistical wireless channel parameters which are relatively easy to obtain. In this method, the performance of the wireless communication network can be dynamically evaluated via simulation while adjusting base stations' positions...
This paper presents a novel waveguide antenna which can radiate ieee802.11g channel 1 signal and channel 6 signals with high channel isolation. The radiation is achieved by cutting two slots on the top and side of the waveguide. Two different polarized radiations are achieved by the two slots and the high isolation is achieved by the two different polarizations. Experimental results show that isolation...
A UWB microwave-photonic chaotic radar system for remote ranging is proposed and demonstrated. The chaotic detection signal is transmitted by an ultra-wideband transmitting antenna after a 24 km single-mode fiber transmission to a remote antenna unit. The received signal is converted into the corresponding optical signal through directly modulating and carried by another approximately 24 km single...
Hyperspectral unmixing is an important issue to analyze hyperspectral data. Based on the present mixing models, this paper proposes a new nonlinear unmixing framework for hyperspectral imagery. The proposed framework transforms the hyperspectral unmixing problem to a constrained nonlinear least squares problem by introducing the abundance nonnegative constraint, abundance sum-to-one constraint and...
This paper presents the comparison of the in-orbit calibrations between the microwave sounders on the National Oceanic and Atmospheric Administration (NOAA) 15, 16, 17, 18 and 19 and FengYun 3A (FY-3A) and FY-3B satellites using the ray-matching method over the South Pole and North Pole study area in 2011. The results show that the in-orbit calibrations of NOAA Advanced Microwave Sounding Unit A (AMSU-A/NOAA)...
A tunable microstrip antenna with circular polarization across a frequency span of 1.4∶1 is presented. A dual mode microstrip antenna element with independent frequency control for each polarization is designed. Circular polarization is then achieved with both modes tuned to resonate slightly offset from the intended operating frequency. Measured return loss and patterns are presented.
Big data analytics is the process of examining large amounts of data (big data) in an effort to uncover hidden patterns or unknown correlations. Big Data Analytics Applications (BDA Apps) are a new type of software applications, which analyze big data using massive parallel processing frameworks (e.g., Hadoop). Developers of such applications typically develop them using a small sample of data in...
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.