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With the increasing penetration of renewable energies, the seamless integration and related energy management problems present challenges to the traditional power grid. Voltage source converter based multi-terminal HVDC (VSC-MTDC) has been regarded as a prospective emerging technology for the above mentioned issues. With its flexible control characteristics, it is expected that VSC-MTDC systems will...
Datacenters often are a power utility's largest consumers, and are expected to participate in several power management scenarios with diverse characteristics in which Energy Storage Devices (ESDs) are expected to play important roles. Different ESD technologies exist, including little explored technologies such as flow batteries, that offer different performance characteristics in cost, size, and...
In a complex security SoC, multiple crypto IP cores are used in real-time, which brings a lot of interruptions to CPU by regular solutions. In this regard, a specific data transfer controller(SDTC) is proposed in this work, which can process encryption and decryption tasks with pipelined operations. Using SDTC to process these tasks can economize CPU source to improve entire performance of SoC. Besides,...
Further improvement in the control accuracy of the hydraulic servo system is hampered by its position control structure and non-structural uncertainty. For structural uncertainties, nonlinear adaptive control can be applied to achieve asymptotic tracking performance. While unstructured uncertainties, such as nonlinear frictions, always exist in hydraulic systems and reduce the tracking accuracy. In...
Multi-model adaptive preview control for state-delay system with unknown parameters is considered in this paper. State-delay system with unknown parameters is changed into a general system without state delay in form by using discrete lifting techniques. Then, according to preview control theory, augmented error system without state delay is obtained. Based on multi-model adaptive preview control...
A datacenter's power consumption is a major contributor to its operational expenditures (op-ex) and one-time capital expenditures (cap-ex). The recurring electricity cost is often in large determined by datacenter peak-demand under peak-based pricing which is employed by major electric utility providers. There is a growing interest in reducing a datacenter's electricity costs by using throttling techniques...
The main chemical compositions of tobacco is one of the significant factors to decide the quality of tobacco, and it is time consuming, expensive, unrepeatable and destructive to obtain the chemical compositions in laboratories. This paper investigates the relationship between tobacco near infrared (NIR) spectra and chemical composition, thus the chemical composition can be easily obtained through...
The rapidly increasing elderly population in many developed and developing countries poses great challenges to elderly care systems. To alleviate the problem of a shrinking workforce to deliver elderly care, using mobile intelligent assistants to lessen the caregivers' workload becomes a promising solution. However, the friendliness of such mobile assistants, which is seldom measured in a quantitative...
Group connectivity is one of the major research challenges in large-scale industrial wireless sensor networks (IWSNs). Critical nodes (CNs) are mainly responsible to maintain group-connectivity. This article focuses on prioritize these CNs to sleep more than other nodes in order to save their energy resulting prolong global connectivity in group-based IWSNs.
Cloud datacenters must ensure high availability for the hosted applications and failures can be the bane of datacenter operators. Understanding the what, when and why of failures can help tremendously to mitigate their occurrence and impact. Failures can, however, depend on numerous spatial and temporal factors spanning hardware, workloads, support facilities, and even the environment. One has to...
Road shape estimation is important for the safe driving of intelligent vehicles. The common road shape models such as line/parabola, spline and clothoid are lacking of flexibility in various urban traffic scenes. In this paper, a robust road shape model which consists of multiple overlapped submaps is proposed. Each individual submap is represented by a smooth curve generated through Gaussian process(GP)...
This paper addresses the signal-strength-of-arrival (SSOA) based localization problem with unknown transmit power, which is of vital importance for the rescue system in ruins scenarios. First, a semidefinite programming method is proposed to transform the nonconvex and nonlinear problem into a convex optimization problem, which presents an excellent performance even in the high interference situations...
With the recent advancement in sensing devices, large-scale industries generates a massive amount of data which are generally processed in a centralized manner. In this poster, Fog Computing paradigm is employed for the industrial applications with an aim to reduce traffic overhead leveraging storage and computing services toward edge devices.
In this poster, we consider software-defined wireless sensor networks (SDWSNs) and present a lightweight flow management to reconfigure flow entries in flow-table when link fault occurs in the data plane of SDWSNs.
In large-scale industrial wireless sensor networks (IWSNs), some nodes are likely to be critical to maintain group-connectivity. Prior studies on topology control with critical nodes (CNs) mainly focus on network connectivity inside a group. It is non-trivial to maintain group-connectivity without considering any CNs in group-based IWSNs. Sleep scheduling is one of the approaches to save residual...
We designed and fabricated a broadband, polarization-independent photodetector by integrating graphene with a fractal Cayley tree metasurface. Our measurements show an almost uniform, tenfold enhancement in photocurrent generation due to the fractal metasurface structure.
Solar energy harvesting is limited in industrial wireless sensor networks (IWSNs) due to dynamic nature of ambient source and network deployment strategies. In this article, we propose a sleep scheduling scheme with solar harvesting and non-harvesting nodes to combine the advantages of energy harvesting and sleep scheduling to prolong the network lifetime.
Sub-room-level location-based services are poised to impact people's daily lives in the near future. Sub-room-level semantic location history (SLH) construction is an essential component of such services. However, little in-depth research on constructing SLH in sub-room-level scenarios has been conducted. In this paper, we propose iMiner, an automatic sub-room-level SLH construction system. iMiner...
Despite the fact that original Iterative Closest Point(ICP) algorithm has been widely used for registration, itcannot tackle the problem when two point clouds are par-tially overlapping. Accordingly, this paper proposes a ro-bust approach for the registration of partially overlappingpoint clouds. Given two initially posed clouds, it firstlybuilds up bilateral correspondence and computes bidirec-tional...
With the increasing demand of electricity, the development of urban power grid has drawn a lot of attention in China. In order to focus on the analysis of urban power grid, the remaining part of the large-scale power grid used to be reduced. The accuracy of the equivalence is key to urban power grid research. In this paper, a multi-step dynamic equivalent method based on district-dividing is proposed...
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