We propose an analysis-by-synthesis method for fast multi-view 3D reconstruction of opaque objects with arbitrary materials and illumination. State-of-the-art methods use both neural surface representations rendering. While flexible, are a significant bottleneck in optimization runtime. Instead, we represent surfaces as triangle meshes build differentiable rendering pipeline around rasterization shading. The renderer is used gradient descent where mesh shader jointly optimized to reproduce...

Big data is promoting the development of supply chain design and management. The problem trustworthy scheduling by using big challenging, it significantly influences performance agricultural products (APSC) Currently, there are various approaches to optimize APSC, but most them can only tackle with primary objectives (time cost) or limited small-scale chains. efficient have not been provided for APSC in environment. This paper aims at proposing a novel optimization approach data. First, new...

It is well known that visible light communication (VLC) systems with the direct current-biased optical orthogonal frequency division multiplexing (DCO-OFDM) scheme suffers from high peak-to-average power ratio (PAPR), which leads to serve distortion and degradation of output emitting diodes. Selected mapping (SLM) technique an attractive PAPR reduction for radio OFDM systems. However, conventional SLM (CSLM) techniques cannot be adopted directly in DCO-OFDM VLC because signals are restricted...

This paper proposes a novel peak-to-average power ratio (PAPR) reduction scheme, which has several advantages, such as low-complexity candidate construction and no side information (SI) transmission in direct current-biased optical orthogonal frequency division multiplexing (DCO-OFDM) visible light communication (VLC) systems. In the proposed candidates can be generated by linearly combining time-domain even odd sequences with cyclic shift phase rotation. Even are obtained adopting an...

Clipping noise caused by light emitting diode (LED) non-linearity is a significant issue for orthogonal frequency division multiplexing (OFDM)-based visible communication (VLC) systems. In this Letter, we propose what believe to be novel transmission scheme mitigate clipping in OFDM-based VLC The proposed utilizes three time slots transmit the signs of noise, clipped signals, and absolute values respectively. At receiver, from first slot are decoded used reconstruct noise. Subsequently,...

With the increasing popularity of light emitting diodes (LEDs), visible communication (VLC) systems provide an attractive alternative method for wireless communication. To reduce complexity and achieve lower cost, on-off keying (OOK) modulation has been widely adopted in implementation VLC systems. Although conventional minimum-voltage detection circuit can remove interference from sunlight or ambient light, low frequency noise problem is still unsolved. overcome this drawback, we propose a...

Getting robots to navigate multiple objects autonomously is essential yet difficult in robot applications. One of the key challenges how explore environments efficiently with camera sensors only. Existing navigation methods mainly focus on fixed cameras and few attempts have been made active cameras. As a result, agent may take very long time perceive environment due limited scope. In contrast, humans typically gain larger field view by looking around for better perception environment. How...

This paper proposes the use of a metric-based peak-to-average power ratio (PAPR) reduction method and joint spreading code allocation subcarrier scrambling (JSCASS) scheme in downlink multicarrier code-division multiple-access (MC-CDMA) systems. Subcarrier is employed MC-CDMA systems to introduce additional disturbances correlated patterns among subcarriers. In particular, variance time-domain signal derived from an approximate closed-form expression. Given that PAPR values are monotonically...

A novel peak-to-average power ratio (PAPR) reduction scheme designated as extended selected mapping (eSLM) is proposed for space-frequency block coding (SFBC) multi-input multi-output orthogonal frequency division multiplexing systems. In the eSLM method, extension matrices comprising amplitude extensions and phase rotations are constructed to indicate signal index without need side information minimize PAPR, respectively. To reduce computational complexity incurred by inverse discrete...

This paper proposes an intelligent scalp inspection and diagnosis system based on the deep learning techniques for caring hair health. The proposed can automatically recognize status of user's scalp. Moreover, we continuously increase in number samples to enhance accuracy rate by adopting techniques. consists a detector, app running tablet, cloud management platform. detector will be connected with tablet via Wi-Fi wireless network. Thus, photo captured detector. recognized result also sent...

A Gaussian integer is a complex number whose real and imaginary parts are both integers. In addition, sequence defined to be perfect if only the out-of-phase value of periodic autocorrelation function (PACF) equals zero. This paper commences by presenting novel class sequences. The investigated sequences generated two groups base with four in each group. nonzero elements these belong set {±1,±j}. can obtained linearly combining or their cyclic shift equivalents arbitrary coefficients equal...

Orthogonal Walsh-Hadamard sequences have been adopted for peak-to-average power ratio (PAPR) reduction without sending side information in pilot-aided orthogonal frequency division multiplexing systems. The PAPR performance is determined by the number of sequences, which equal to sequence length. However, increasing length pilot significantly degrades bandwidth efficiency. current study presents a novel set obtained sub-sampling Zadoff-Chu sequences. sub-sampled are then equally partitioned...

This paper presents a novel frequency offset estimator for inter-carrier-interference (ICI) self-cancellation coded orthogonal division multiplexing (OFDM) systems, which map data symbols onto adjacent or symmetric subcarriers with weighting coefficients of +1 and -1. There are two major drawbacks traditional ICI schemes. First, the common phase error (CPE) caused by carrier (CFO) can not be removed. Second, performance is substantially degraded when CFO large. To remedy these drawbacks,...

This work presents a novel peak-to-average power ratio (PAPR) reduction scheme, namely extended selected mapping (eSLM), in space-frequency block coding (SFBC) MIMO-OFDM systems. By introducing phase rotations and amplitude extensions into so-called extension matrices, the candidate signals with lowest PAPR can be receiver is able to identify index of without transmission side information. Thus, proposed eSLM has higher spectrum efficiency compared conventional SLM-based methods which demand...

In recent years, energy issues have become more prominent. To solve problems, distributed power generation has received great attention. Therefore, also extensive attention and rapid development. This puts higher requirements on the quality of output inverter. How to control LCL type grid-connected inverter achieve goal better is a hot difficult point that needs be overcome in years.In this paper, simulation model established MATLAB/Simulink environment, advantages PI are analyzed, based...

In this paper, a relay selection method based on the minimum opportunity cost (MOC) is proposed to prolong lifetime of amplify-and-forward (AF) cooperative networks with multiple radio frequency energy-harvesting (RFEH) relays, where defined as longest period in which outage probability network lower than predefined threshold. Compared existing strategies take channel state information(CSI), residual energy information(REI) into account, scheme outperforms others when requirement stringent....

In this paper, a bandwidth efficient synchronization scheme for joint timing and frequency estimation is investigated orthogonal division multiplexing (OFDM) systems. The architecture super-imposes transparent generalized chirp-like (GCL) sequence [1] onto the domain data symbols. contrast to existing schemes, super-imposed does not require dedicate transmitting pilot sequences robust multi-path channels. both offset carrier (CFO) estimators are derived by using maximum likelihood (ML)...

Distributed power sources have attracted much attention because of their small scale and cleanliness. The development smart grids based on distributed is also the trend world today. Therefore, this article great significance to construction distribution network model research stability model. This paper builds a basis SVPWM (Space Vector Pulse Width Modulation) algorithm, simulates process power, after delay setting changes demand inverter 3, it verifies that master-slave control in...