The log-sum function as a penalty has always been drawing widespread attention in the field of sparse problems. However, it brings non-convex, non-smooth and non-Lipschitz optimization problem that is difficult to tackle. To overcome problem, an iterative threshold algorithm for problems with proposed this paper. For brevity, are named regularization. Firstly, by introducing intermediate construct another new function, property theorem about solution regularization established. Secondly,...

We present closed-form expressions of the average link throughput for sensor networks with a slotted ALOHA MAC protocol in Rayleigh fading channels. compare three regular topologies terms throughput, transmit efficiency, and transport capacity. In particular, square lattice networks, we sensitivity analysis maximum optimum probability respect to signal-to-interference ratio threshold. For random nodes distributed according two-dimensional Poisson point process, is analytically characterized...

Inverse synthetic aperture radar (ISAR) can only provide two-dimensional (2-D) images to represent the target's scattering projection on corresponding imaging planes. However, as echo of target from different observation angles be achieved simultaneously, network 3-D information about target. In this article, a novel image reconstruction method is proposed based and compressed sensing (CS). First, general signal model conditions are given. Then, distribution built in CS framework, which...

In this paper, contrapose the impendency for multi-target high-resolution imaging with limited resources, a radar network time scheduling is proposed based on game theory and reinforcement learning inverse synthetic aperture (ISAR) task regarding targets in different beams. According to demand using least amount of achieve expected resolution, observation problem formulated. The behaviour optimization analyzed, constructed acquire strategy. For purpose finding out optimal strategy profile,...

Impedance spectroscopy is a powerful tool for characterizing materials that exhibit frequency dependent behaviour to an applied electric field. This paper introduces fully integrated multi-channel impedance extraction circuit can both generate AC stimulus signals over broad range and also measure digitize the real imaginary components of response. The was fabricated in 0.5 μm complementary metal-oxide semiconductor. Tailored cellular membrane interface characterization, signal generator...

The growing demand for personal healthcare monitoring requires a challenging combination of performance, size, power, and cost that is difficult to achieve with existing gas sensor technologies. This paper presents new CMOS monolithic microsystem meets these requirements through unique electrochemical readout circuits, post-CMOS planar electrodes, room temperature ionic liquid (RTIL) sensing materials. architecture design the CMOS-RTIL-based are described. device occupies less than 0.5mm2...

Abstract The measurement-device-independent (MDI) quantum key distribution (QKD) is considered to be an alternative overcome the currently trusted satellite paradigm. However, feasibility of space-based MDI-QKD remains unclear in terms factors: high-loss uplink between a ground station and satellite, limited duration when two stations are simultaneously visible, as well rigorous requirements for two-photon interference performing Bell-state measurement. In this paper, we present assessment...

Uniformly random or Poisson distributions are widely accepted models for the location of nodes in wireless sensor networks if deployed large quantities and there is little control over where they dropped. On other hand, by placing regular topologies, we expect benefits both coverage efficiency communication. We describe analyze a basic localized algorithm three modifications topology that provide tradeoff between performance deployment cost. The objective to regularize improved energy...

For radar imaging of multiple targets in different beams, it is necessary for the network to coordinate task among various radars achieve best multi-target performance under limited system resources. This paper proposes a allocation optimization method inverse synthetic aperture (ISAR) targets. The resolution an important indicator quality. Therefore, relationship between and time analyzed at first. Thereafter, problem converted into resource network. Combining with sparse ISAR algorithm,...

Reasonable and effective resource allocation strategy can fully utilize the system potential of radar sensor network especially under limited resources. In this paper, a joint time aperture optimization problem multi-target inverse synthetic (ISAR) imaging in phased-array with game theory is investigated. The purpose to complete whole tasks high resolution within Obviously, competition for resources exists among targets constraints. After analyzing relationship between image resources, which...

A high-resolution three-dimensional (3D) image reconstruction method for a spinning target is proposed in this paper and the anisotropy overcome by fusing different observation information acquired from radar network. The will reconstruct 3D scattering distribution, mapping of reconstructed onto imaging plane identical to two-dimensional (2D) result. At first, range compression inverse radon transform employed produce 2D target. In addition, process analyzed formulas which are map point...

We expand the literature on state taxes and entrepreneurship in several ways. First, we estimate dynamic panel regressions rather than fixed effects models order to account for inertia small business outcomes. Second, while prior research has focused extensive-margin indicators of activity such as self-employment rates, consider more policy-relevant intensive-margin measures drawn from nonfarm proprietors' income employment data. Third, examine a longer (1978-2009) conclude that major tax...

In this paper, we present closed-form ex- pressions of the average per-node throughput for sensor networks with a slotted ALOHA MAC protocol in Rayleigh fading channels. We compare three regular topologies terms throughput, transmit efficiency, and transport capacity. particular, square lattice networks, an analysis dependence maximum optimum proba- bility on signal-to-interference-ratio threshold required successful reception. For random nodes distributed according to two-dimensional...

With the advent of digitalization, retail industry has undergone significant transformations, ushering in era omni-channel. However, most retailers struggle with stagnant omni-channel transformation due to limited decision analysis tools and quantitative research. This study utilizes case data Agent-Based Modeling (ABM) compare three models: brick & mortar, pure-play e-tailer, Through a comprehensive evaluation enterprise, social, consumer utilities, model emerges as optimal choice. The also...

In this paper, a task allocation strategy for multi-target inverse synthetic aperture radar (ISAR) imaging in network is proposed by using the potential game theory. The ISAR problem paper refers to that targets are different beams and purpose accomplish all tasks with high resolution within limited time. First of all, formulated. According problem, optimization search satisfied profile targets, proven be an exact which has at least one Nash equilibrium (NE). optimal suboptimal solution can...

Recently, there are few reports on three-dimensional (3D) imaging method based radar network. Aiming at the 3D problem in network, a reconstruction for inverse synthetic aperture (ISAR) image network is proposed this paper. The 2D ISAR considered as geometric projection of target an plane; thus, aerial points might be scatterers targets if their plane similar to target. makes use similarity between Range-Doppler (RD) and target's construct model. reconstructed obtained by estimating...

In recent years, security incidents of integrated electronic systems occur frequently. The analysis has attracted wide attention. majority existing works are aimed at detecting specific risks. However, there is a lack underlying framework for the and protection methods systems. This article designs an attack defense to evaluate based on MIL-STD-1553B data bus. We set up simplified system simulation environment apply designed simulate attacks proposed

Zombie firms have strong negative effects on society. This paper empirically investigates the of zombie financial information transparency normal and finds that significantly reduce these firms, thus also reducing their performance. Further analysis reveals more obvious without political connections, in poor legal environments, highly competitive industries.

For wireless ad hoc networks with stationary and deterministically placed nodes, finding the optimal placement of nodes is an interesting challenging problem, especially under energy QoS constraints. We study compare performance several regular topologies utilizing a Rayleigh fading link model. nearest neighbor shortest path routing, analytical expressions efficiency, delay, consumption for given end-to-end reception probability are derived. interference analysis, maximum throughput optimum...