Time synchronization and localization are basic services in a sensor network system. Although they often depend on each other, usually tackled independently. In this work, we investigate the time problems underwater networks, where more challenges introduced because of unique characteristics water environment. These include long propagation delay transmission delay, low bandwidth, energy constraint, mobility, etc. We propose joint solution for synchronization, which stratification effect...

This paper is concerned with the problem of filter design for target tracking over sensor networks. Different from most existing works on networks, we consider heterogeneous networks two types sensors different processing abilities (denoted as type-I and type-II sensors, respectively). However, questions how to deal heterogeneity a such kind remain largely unexplored.We propose in this novel distributed consensus solve problem. Two criteria, namely, unbiasedness optimality, are imposed...

Cyber-physical systems (CPS) are characterized by integrating cybernetic and physical processes. The theories applications of CPS face the enormous challenges. aim this paper is to provide a latest understanding emerging multi-disciplinary methodology. First, features described, research progresses summarized from different components in CPS, such as system modeling, information acquisition, communication, control security. Each part also followed future directions. Then some typical given...

Optimal power management of shipboard system for failure mode (OPMSF) is a significant and challenging problem considering the safety person. Many existing works focused on transient-time recovery without consideration operating cost voyage plan. In this paper, OPMSF formulated mid-time scheduling faults at bus generator. Two-side adjustment methods including load shedding reconfiguration are coordinated reducing fault effects. To address non-convex problem, travel equality constraint...

The wide application of Internet Things (IoT) in industrial automation encourages the emergence a new paradigm IoT systems, wireless control system (WCS), where and/or information is delivered over channels. In practical WCSs would consist multiple control-loops general, resource competition among which seriously increase mutual interferences and transmission collisions, making it difficult to provide required reliability for strategy. To address this issue, we design strategy together with...

Abstract The study of fast sorting algorithms has long been an enduring research focus. Traditional often suffer from high time complexity, typically staying at ( n 2 ) or O × log ). Given the parallel processing advantages field programmable gate array (FPGA), it become a popular platform for algorithm acceleration. However, existing hardware acceleration methods remain rooted in classical software models, merely leveraging execution, without fully exploring unique architecture and...

This paper focuses on exploiting the sensor fusion capability for situation monitoring applications over a kind of relay assisted networks consisting multiple kinds nodes (SNs) and (RNs). SNs implement assimilation new measurement cooperation with other nodes. Moreover, have different sensing modalities, which can only measure part target parameter vector monitoring. While RNs, main role is to aggregate their neighboring data. We propose distributed consensus based unbiased estimation...

Machine-type communication emerges recently as a solution to cater for ubiquitous connections between diversity of devices and the public wireless data networks. Long Term Evolution Advanced system introduces machine (M2M) an important part realising blueprint smart cities. To bring M2M into reality, access procedure is key problem. Massive requests on air interface in make scenarios significantly different from traditional communications, which challenges cellular mechanism greatly. In this...

Recently, the intelligent reflecting surface (IRS) is an emerging and promising technology for achieving higher spectrum energy efficiency in wireless communication systems. In this paper, we consider a powered mobile edge computing (MEC) network that equipped with IRS. The IRS able to provide channel enhance offloading capability users. Based on system model, investigate optimisation problem maximize sum of users' utilities, which jointly efficiency, time latency, price computations. With...

Roll damping test is used to calculate roll coefficient, which an important coefficient in predicting ship seakeeping capability. And because of the complexity naval ship's shape (with bulbous bow and transom stern), it's rare find numerical simulation its motion. In this paper, DTMB5512 model's motions at different initial angles are simulated based on CFD, vessel's coefficients calculated through results, results show good agreements with tank data.

This study mainly focuses on investigating the influence of meridional contour a steam centrifugal compressor aerodynamic performance. An optimal design method is put forwards, in which hub-line plane modified and optimized. Based data from numerical simulation, characteristics are compared detail among prototype three impellers. It shown that stall margin optimized impeller can be enlarged by approximately 50%, though at point efficiency pressure ratio decreased little bit. Under working...

This paper investigates the energy efficient resource allocation for orthogonal frequency division multiple access (OFDMA) relay systems, where system is supplied by conventional utility grid and a renewable generator equipped with storage device. The optimal usage of radio depends on characteristics generation mobile traffic, which exhibit both temporal spatial diversities. Lyapunov optimization method used to decompose problem into joint flow control, management without knowing priori...

The fuel cell hybrid electric ship (FCHES) uses cells and batteries as power sources to meet the load demand has a good development prospect due its zero greenhouse gas emission. Under constraints of system safety voyage plan, optimal energy management FCHES is an important challenging issue. In this paper, we focus on problem considering aging cost. First, uniform optimization model formulated schedule output multiple batteries, propulsion power. objective minimize sum consumption cost...

Space-air-ground integrated network (SAGIN) is emerging as a prominent framework supporting the ever-growing Internet of Things (IoT) applications in areas without infrastructures. In this paper, we investigate problem IoT task offloading under SAGIN scenario where multiple devices cooperatively use computing resources. We formulate minimizing processing delay all tasks, taking into account dynamics tasks generated by each device, mobility unmanned aerial vehicle (UAV), and difference power...

This paper considers multiaccess control for the uplink in orthogonal frequency division multiple access wireless networks. To avoid extensive information exchange associated with centralized approaches, we formulate decentralized problem contention power constraint as a Bayesian game, mapping time-varying channel state into strategies. By exploiting structure, strategy where users channels probability one if observed gain is above predetermined threshold shown to be optimal. It also that...