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The phase correction algorithm of dual channel mono-pulse radar is studied in this paper. The angle error voltage of the tracking receiver is represented by a complex number. The expression of the relation between the corrected phase and the corrected slope and the error voltage is derived, and a fast phase detection method is proposed. phase detection rate of this method is significantly faster than...
This paper proposes a consensus-based filtering algorithm to solve a nonlinear information fusion problem in multi-agent system that the state vector of the target is constrained. This method is based on the Kalman-Consensus filtering algorithm, Extended Kalman filter and null space method. Simulations on target tracking prove the feasibility of the algorithm in dealing with state estimation of nonlinear...
Light field capture and multi-layer light field displays are increasingly concerned topics for academia and industry. However, an integrated discussion connecting capture and display has been long neglected. Therefore, this paper proposes a duality analysis of capture and display to comprehensively analyze and define two basic attributes; depth range and angular resolution. The main contribution of...
The horizontal-parallax-only (HPO) compressed light field 3D display based on stacked LCDs is presented in this paper. The backlight of this 3D display is steered to diffuse only in horizontal direction to make the rays transmit in horizontal plane between multiple LCDs. It will significantly reduce the computation complexity of the optimization in the generation of the display images. The simulation...
Headbox is the key component in a paper machine which has a significant effect on product quality. In this paper, a hybrid model which combines mixing tank and air-cushioned headbox is proposed. In the hybrid model, the mixing tank is taken into consideration, which makes the consistency of pulp controllable. An internal model controller with both good control effect and strong robustness is designed...
It has been well recognized that network transmission constitutes a large portion of smartphone energy consumption, mainly because of the tail energy caused by cellular network interface. Traffic offloading has been proposed to reduce energy by letting a smartphone offload network traffic to its neighbors in vicinity via low-power direct connections (e.g., WiFi Direct or Bluetooth). Our experiments...
Crowdsourcing allows requesters to allocate tasks to a group of workers on the Internet to make use of their collective intelligence. Quality control is a key design objective in incentive mechanisms for crowdsourcing as requesters aim at obtaining answers of high quality under a given budget. However, when measuring workers' long-term quality, existing mechanisms either fail to utilize workers' historical...
Multicasting is a fundamental functionality of networks for many applications including online conferencing, event monitoring, video streaming, and system monitoring in data centers. To ensure multicasting reliable, secure and scalable, a service chain consisting of network functions (e.g., firewalls, Intrusion Detection Systems (IDSs), and transcoders) usually is associated with each multicast request...
Big data analysis is usually casted into parallel jobs running on geo-distributed data centers. Different from a single data center, geo-distributed environment imposes big challenges for big data analytics due to the limited network bandwidth between data centers located in different regions. Although research efforts have been devoted to geo-distributed big data, the results are still far from being...
Cloudlet based network provides a platform to offloading the traffic workload generated by mobile devices. It can significantly reduce the access delay for mobile application users. However, the high dynamic mobility of users brings significant challenges to the service provisioning for mobile applications, especially for the delay-sensitive big data applications. To increase the overall admitted...
This paper focuses on the security issue in Cyber-Physical Systems. The sensor transmits the state estimation information to the remote controller via wireless networks. Due to the broadcast characteristics of wireless communication, the systems are vulnerable to the eavesdropping attacks and jamming attacks. In this paper, we study how to maximize the secure transmission rate between sensors and...
With the ubiquitous deployment of the mobile devices with increasingly better communication and computation capabilities, an emerging model called spatial crowdsourcing is proposed to solve the problem of unstructured big data by publishing location-based tasks to participating workers. However, massive spatial data generated by spatial crowdsourcing entails a critical challenge that the system has...
In data relay satellite (DRS) systems, the performance of tasks scheduling is influenced by the variation of task and resources, which degrades the processing capacity of relay satellites. Considering this problem, we investigate the dynamic scheduling in the application of DRS. To achieve the efficient resource utilization and reliable data transfer, the strategies of task preemptive switching and...
Earth satellite networks are playing an increasingly important role in observation, surveillance and reconnaissance of specific targets or areas with dramatic growing of the demand for such services. The harsh and vulnerable space environment makes satellite nodes susceptible to a variety of attacks and prompts us to protect satellite networks by securing them with efficient defending strategy. In...
In this paper, a resilient information management (RIM) system for a network isolated environment after disasters is proposed. Using this system, people can manage and share various types of information including medical information, damaged area and map information, and supply/demand information. A RIM system is realized on a locally and quickly established WiFi network environment. Thus, the RIM...
The traditional random sample consensus (RANSAC) algorithm is capable of estimating a model with fewer data points and almost unaffected by noise. There are several drawbacks of such algorithm including detection errors, unstable threshold and massive calculation. By analyzing the spatial relations of graphics pixels, a hypothetical circle is firstly formed with three hypothetical points which are...
Demand side management (DSM) is a key mechanism to make smart grids cost efficient using electricity price forecasting issue. Price forecasting method takes the big price data into account, and gives estimates of the future electricity price. However, most of existing price forecasting methods cannot avoid redundancy at feature selection and lack of an integrated framework that coordinates the steps...
After big disasters, a damaged area can be out of contact because of severe damage of existing network infrastructures. Meanwhile, high demands for network connections to the disaster area will arise to collect damage information and disseminate rescue instructions. In this paper, we propose to construct a network for disaster management using mobile stations equipped with sensors and network interfaces...
Today's computer networks rely on a wide spectrum of specialized middleboxes to improve their security and performance. Traditional middleboxes that are implemented by dedicated hardware are expensive and hard to manage. A promising technique of consolidated middleboxes – implementing traditional middleboxes in Virtual Machines (VMs) – offers economical yet simplified management of middleboxes in...
In this paper, we investigate the energy-efficient power control for device-to-device (D2D) communications underlaying cellular networks with max-min fairness, where uplink resource blocks allocated to one cellular user equipment are reused by multiple D2D pairs to improve the frequency reuse factor, and the minimum individual energy efficiency (EE) is maximized. This is a generalized fractional programming...
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