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Packing and placement are two crucial stages for FPGA realization. In the design flow, the basic logic units, such as look-up-tables (LUTs) and flip-flops (FFs), have to be merged into configurable logic blocks (CLBs) before placement. How the basic logic blocks are clustered in the packing stage has a great impact on the placement quality. This work presents an analytical placement framework for...
Given a positive integer k, a social network G and a certain propagation model M, influence maximization aims to find a set of k nodes that has the largest influence spread. The state-of-the-art method IMM is based on the reverse influence sampling (RIS) framework. By using the martingale technique, it greatly outperforms the previous methods in efficiency. However, IMM still has limitations in scalability...
The massive online open course (MOOC) revolution offers opportunities for learning analytics regarding the diversity in learning activities of MOOCs. In MOOCs, video lectures represent the principal learning resource, and learners spend most of their time engaged in self-paced, independent learning. Therefore, MOOCs present an innovative form of video-based learning. How to improve this learning environment...
With the popularity of MOOCs (Massive Open Online Courses), massive structured, semi-structured and unstructured data about learning is recorded for further analysis and applications. Forum is the direct way for learners to ask questions and clarify their misconceptions. Therefore, we utilize the plain text of posts and responses in MOOCs forum to extract keywords of misconceptions for instructors...
Metric learning is an important issue in person re-identification, and Mahalanobis-distance based metric learning methods prevail in this field. All of these approaches can be considered as equivalently projecting all samples to a new metric space and calculating the Euclidean distance there. However, the performance of distinguishing similar samples from dissimilar ones via absolute distance is limited...
Time-reversal (TR) transmission scheme has attracted more and more attention from both academia and industry due to its ability to focus the energy of a transmitted signal at an intended focal spot, both in the time and spatial domains. Based on the extensive data collected in the real world, we observe that the energy distribution around the focal spot is highly stationary and location-independent,...
The design of capacitor structures have great impact on capacitance density, parasitic capacitance, routability, and matching quality of capacitor network in a SAR ADC, which may affect power, performance, and area of the whole data converter. Most of the recent studies focused on common-centroid placement and routing optimization of the capacitor network. Only few of them investigated the structures...
This paper proposes a reconfigurable scheme of wireless power transmission in fully-enclosed box. The proposed scheme includes one transmitting element and multiple parasitic elements. Field distribution inside the box is reconfigured by switching the parasitic elements' termination between open and short, with the aim of delivering wireless power efficiently to a receiver whose location is not fixed...
The downscaling in VLSI systems and the use of new materials influences the reliability of components in terms of radiation more and more. The unavoidable presence of particle radiation on ground and in space leads to unwanted failures in the electronic devices. Concerning packaging materials, design and technology a lot of steps were done to avoid radiation sensitivity. Nowadays microelectronic for...
Antenna subset modulation has been proposed as a physical layer security technique for millimeter-wave (mmWave) wireless communications. In antenna subset modulation, the transmitter selects a subset of antennas at the symbol rate to differ the sidelobes of the nonuniform arrays in undesired directions and orients the mainlobe in the target direction by steer beamforming. In this paper, we propose...
Subcarrier assignment plays a key role in energy efficient resource allocation for uplink Orthogonal Frequency Division Multiple Access (OFDMA) networks since the optimal power allocation with a given subcarrier assignment can be easily obtained. Existing subcarrier assignment algorithms with acceptable performance need high computational complexity. In this paper, we aim to reduce the complexity...
We demonstrate the advantages of femtosecond laser annealing on non-vacuum CIGS thin films. The PL spectra implied some defect-levels or band-fluctuations were eliminated, and the conversion efficiency and ideal factor were enhanced after laser annealing.
A handheld, battery-powered intracavity singly resonant optical parametric oscillator (IC-SRO) emitting 3.5 μm, 39 mW CW radiation is demonstrated. The lasing threshold of the IC-SRO (end-pumped by a 808 nm diode) is 120 mW.
We experimentally demonstrate an indoor OFDM-VLC system employing an adaptive digital pre-frequency domain equalization (pre-FDE) technique. By adaptively optimizing the modulation bandwidth of the OFDM signal, the proposed pre-FDE technique can maximize the system capacity.
It is extremely important to optimize the C2 structure to suit to the information warfare. The proposed networked C2 structure, which is composed of a C2 capacity array and a task array, based on the long chain system in industry, aims to fill the gap. This article lucubrates two typical systems, the long chain system (LCS) and 3-chain system (3CS), to explore how they perform when tasks array with...
It is extremely important to optimize the C2 structure to suit to the information warfare. However, there has been no study launched, via increasing information sharing and collaboration ability of the C2 structure, to improve the flexibility of it. In this paper we present a networked C2 structure model, which has more flexibility and a flat netlike form normally, based on the long chain from the...
In this paper, we present TR-BREATH, a time-reversal (TR) based, contact-free, accurate breathing monitoring system capable of multi-person breathing rate estimation within a short period of time (e.g., around one minute) using off-the-shelf WiFi devices. TR-BREATH exploits the fine-grained channel state information (CSI) on WiFi devices to capture the minor variations caused by breathing. To amplify...
In this paper, we propose an indoor positioning system (IPS) that achieves centimeter accuracy in a complex indoor environment using time-reversal (TR) technique with a single pair of off-the-shelf multi-antenna WiFi devices. The proposed IPS can work under both line-of-sight (LOS) and non-line-of-sight (NLOS) environment. Leveraging the spatial diversity on the multi-antenna WiFi device, the proposed...
In this paper, we present a novel face spoofing detection method based on 3D lighting environment analysis of an image pair collected before and after the lighting environment change. Our idea is inspired from the unimpressive fact that the illumination distributions of the internal spoof face stays stable under the protection of the photo and screen plane, while that of a exposed genuine face changes...
Cloud computing in recent years has become very popular and, indeed, many current applications are served from the cloud. Because the cloud architecture is based on virtual machines, VMs and VM management are quite important. Monitoring a large number of virtual machines is an important research topic. Since the establishment of the Personal Information Protection Act, there has been more attention...
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