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 focuses on the optimal wireless powered communication network (WPCN) design. A network composed of two communication groups is considered, where the first group has sufficient power supply but no available bandwidth, and the second group has licensed bandwidth but very limited power. By introducing power and bandwidth cooperation between the two groups, both groups can accomplish their...
Abstract-In this article, the authors focus on a correlated channel model for secure relay beamforming in the relayeavesdropper network. In this network, a single-antenna sourcedestination pair transmits secure information with the help of a amplify-and-forward (AF) relay equipped with multiple antennas. The relay cannot obtain the instantaneous channel state information (CSI) of the eavesdropper...
Indoor positioning systems are drawing ascending attention from the academia as well as industry, motivated by a wide variety of indoor location-based services. Among the existing indoor positioning systems, WiFi-based schemes are more favorable because of the ubiquitous WiFi infrastructures. However, both strong non-line-of-sight scenario and severe ambiguity among location-specific fingerprints...
With current efforts to design Future Internet Architectures (FIAs), the evaluation and comparison of different proposals is an interesting research challenge. Previously, metrics such as bandwidth or latency have commonly been used to compare FIAs to IP networks. We suggest the use of power consumption as a metric to compare FIAs. While low power consumption is an important goal in its own right...
Face super-resolution has attracted much attention in recent years. Many algorithms have been proposed. Among them, sparse representation based face super-resolution approaches are able to achieve competitive performance. However, these sparse representation based approaches only perform well under the condition that the input is noiseless or has small noise. When the input is corrupted by large noise,...
This paper presents the design and implementation of a series-SSHI-phi interface circuit for piezoelectric energy harvesting with improved operating frequency range. Adopting a nonlinear switching architecture, complex impedance matching can be achieved at off-resonance by introducing delay into switching timing. A buck-boost converter following the rectifier is used for resistive-load emulation and...
In this paper, we design an interpolation-directed transform domain downward conversion (ITDDC) to build up a new block-based image compression scheme. This ITDDC is derived from our proposed 2-D padding and performed on each 16×16 macro-block of pixels to convert it into an 8×8 coefficient block, leading to a downward image conversion in the transform domain. More interestingly, the further compression...
High efficiency video coding (HEVC) defines 35 prediction modes in its intra prediction stage to signal the direction information of residual blocks. Traditionally, separable two-dimension (2-D) transforms (integer DCT and DST) are utilized in a similar manner as in the previous H.264/AVC standards. However, such 2-D transforms cannot yield the best energy compaction for a 2-D directional source where...
This paper proposes a DC coefficient estimation algorithm for intra-predicted residual blocks in the High Efficiency Video Coding (HEVC) standard. Discarding the DC coefficient in the current coding block leads to a substantial bit-saving but produces at the same time strong discontinuities between this block and its neighboring reconstructed blocks. To overcome this problem, we propose an estimation...
scanning probe microscopy (SPM) Scanning probe microscopy (SPM) provides nanometer-scale mapping of numerous sample properties in essentially any environment. This unique combination of high resolution and broad applicability has led to the application of SPM to many areas of science and technology, especially those interested in the structure and properties of materials at the nanometer scale. SPM...
We have developed a vertical information processing model, motivated from physiological evidence, which integrates intra- and interneuronal information processing. Information processing at the intraneuronal levels is to create a repertoire of pattern processing neurons. Information processing at the interneuronal levels is to group appropriate pattern processing neurons to constitute an effective...
In order to efficiently recognize actions from depth sequences, we propose a novel feature, called Global Ternary Image (GTI), which implicitly encodes both motion regions and motion directions between consecutive depth frames via recording the changes of depth pixels. In this study, each pixel in GTI indicates one of the three possible states, namely positive, negative and neutral, which represents...
In this paper, we discussed the simultaneous intervention problem that arises from human-robot teams. The problem concerns with the case that one human operator has to intervene with several robots at almost the same time and it cannot be handled properly by existing methods. A model predictive control(MPC) based mixed initiative controller was proposed to solve this problem by embedding an intention...
Hybrid digital/analog precoding has been widely utilized in millimeter-wave (mmWave) multiple-input multiple-output (MIMO) systems. Compared to the digital precoder, it is more challenging to design the analog precoder because of the constant amplitude (CA) constraints on the entries. Although high-resolution analog phase shifters (APSs) can provide more choices in phase adjustment, it also adds the...
The transmission distance of continuous variable QKD (CV QKD) protocol based on Gaussian modulation has been quite limited by the low efficient reconciliation protocol. On the other hand, noiseless linear amplifier (NLA) have greatly enhanced the ability of CV QKD. In this paper, we propose a Gaussian post-selection method simulating NAL in CV QKD, followed by a reconciliation process based on systematic...
Millimeter wave (mmWave) communication is favored for its abundant bandwidth. However, the sampling rate scales up with the large bandwidth, thus making it difficult to implement high-resolution analog-to-digital converters (ADCs). In addition, a large-scale array is employed to overcome the high path loss of the mmWave channels. Due to the large number of antennas and the directional feature of the...
This work investigates the static noise margin (SNM) of 6T SRAM composed of 2D semiconductor MOSFETs. A analytical current-voltage model for 2D semiconductor MOSFETs is applied to analyze all transistors in a 6T SRAM. Simulation model and method are built for basic 6T SRAM structure and that with S/D contact resistance. Effects on SNM of contact resistance and inefficient channel doping are studied,...
In near-threshold multi-voltage designs, large clock skew occurs between different voltage domains. Several works of power-mode-aware buffer (PMAB) were dedicated to diminish this clock skew. However, they were commonly based on circumstances that each power domain had at most two supply voltages. In this brief, we propose a multi-stage PMAB approach to diminish clock skew for multi-voltage multi-power-mode...
In this paper, a predictive maintenance method for maintenance sequence planning problem of series-parallel systems is proposed, which minimizes the system maintenance cost based on the opportunity maintenance. Firstly, the influence relationship diagram is established by considering the topological structure relationship and the function influence relationship. Secondly, with the condition monitoring...
Sleep staging is a fundamental step in diagnosis and treatment of sleep disorders. In current sleep staging systems, normally a set of thresholds should be set up to determine the boundaries in differentiating different linguistic or symbolic features. However, as far as we know, there are no fully satisfying automatic method to do this task. Thresholds are mostly set up manually. In this paper, an...
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.