Wireless sensor networks (WSNs) are composed of a large number inexpensive power-constrained wireless nodes, which detect and monitor physical parameters around them through self-organization. Utilizing clustering algorithms to form hierarchical network topology is common method implementing management data aggregation in WSNs. Assuming that the residual energy nodes follows random distribution, we propose load-balanced algorithm for WSNs on basis their distance density making it essentially...

In this paper, a reaching law-based adaptive fixed-time terminal sliding mode control law, which is used for coupled spacecraft tracking maneuver in the presence of large inertia parametric uncertainties and external disturbances, proposed. The 6-DOF kinematics dynamics motion are modeled on Lie group SE(3). relative configuration expressed by local coordinate (exponential coordinate) order to estimate parameters we also propose novel update can make law be applied without priori. Fixed-time...

This article proposed an extended state observer (ESO)–based output feedback control scheme for rigid spacecraft pose tracking without velocity feedback, which accounts inertial uncertainties, external disturbances, and input constraints. In this research, the 6-DOF error dynamics is described by exponential coordinates on SE(3). A novel continuous finite-time ESO to estimate information compound disturbance, estimations are utilized in law design. The ensures a uniform ultimately bounded...

To solve the problems that a large number of random and uncontrolled electric vehicles (EVs) connecting to distribution network, resulting in decrease performance stability grid high user costs, this study, multi-objective comprehensive charging/discharging scheduling strategy for EVs based on improved particle swarm optimization (IPSO) is proposed. In minimum root-mean-square error peak valley difference system load are first designed as objective functions; side, lowest charge discharge...

Based on the concept of "Evolutionary Traps", targeting survival essential genes obtained during tumor drug resistance can effectively eliminate resistant cells. While, it still faces limitations. In this study, lapatinib-resistant cells were used to test Traps" and no suitable target stand out because identified without accessible drug. However, a membrane protein PDPN, which is low or non-expressed in normal tissues, as highly expressed PDPN CAR-T developed showed high cytotoxicity against...

This paper aims to solve the control problem of coupled spacecraft tracking maneuver in case actuator faults, inertia parametric uncertainties, and external disturbances. Firstly, attitude position coupling kinematics dynamics model are established on Lie group SE(3), relative motion error is derived by exponential coordinates. Then, considering an adaptive fuzzy scheme proposed estimate lumped disturbances real time, a novel modified fixed-time terminal sliding mode fault-tolerant law...

Kinematics of a free-floating space-robot system is fundamental and complex subject. Problems at the position level, however, are not considered sufficiently because nonholonomic property system. Current methods cannot handle these problems simply efficiently. A novel systematical modeling approach provided; forward inverse kinematics level deduced based on product exponentials (POE) formula conservation linear momentum. The whole deduction process concise clear. More importantly, inertial...

The traditional satellite orbit determination system, which depends on ground stations and estimates every satellitepsilas states separately, can not meet the requirement of autonomous navigation system. To solve this problem, method semi-autonomous for whole constellation by using intersatellite crosslink a few activated stochastically was proposed. After establishing dynamic state equation, observations equation filtering model, flow simulation designed. And result verified that reduce...

Space–ground integrated network, a strategic, driving, and irreplaceable infrastructure, guarantees the development of economic national security. However, its natures limited resources, frequent handovers, intermittently connected links significantly reduce quality service. To address this issue, quality-of-service-aware dynamic evolution model is proposed based on complex network theory. On one hand, strategy adopted in model. During phases growth are established or deleted according to...

Access authentication is a key technology to identify the legitimacy of mobile users when accessing space-ground integrated networks (SGIN). A hierarchical identity-based signature over lattice (L-HIBS) based access mechanism proposed settle insufficiencies existing methods in SGIN such as high computational complexity, large delay and no-resistance quantum attack. Firstly, idea cryptography introduced according distribution nodes SGIN, architecture built. Secondly, new L-HIBS scheme...

Based on the honeycomb sandwich structure supported plates of a satellite antenna, bending effect is analyzed with analytical method and finite element (FEM) to design verify models established in paper. Then, without/with considering flexural rigidity face sheets solved. And equivalent model constructed for valuating analysis. Then three different are method. The results show that, can affect when thickness cant be ignored. Compared reality model, more conservative. Its significant...

Utilizing the clustering algorithm to form hierarchical network topology is common method of implementing management and data aggregation in wireless sensor networks. Many algorithms heuristically determine node energy, optimal communication radius, even though these parameters affect energy consumption entire network. In order minimize network, we present configuration by quantitative analysis when nodes follow random distribution. With conclusion single cluster expanded general case,...

The standard Kalman Filter (KF) algorithm can't estimate the control parameters accurately when there are errors in model of missile system. Thus, state-space equations and observation testing parameter were established, based on Constant Acceleration (CA) model. Then principle KF impact test to filter results analyzed, method dynamically adjusting weight prediction information result was introduced, then Robust-adaptive (RAKF) recursion formula presented. Finally system verified using...

This paper aims to address an integrated relative attitude and position fault-tolerant control strategy between a follower spacecraft leader for coupled tracking maneuver in the case of inertia parametric uncertainties, external disturbances, actuator failures, saturation. The rotational translational kinematics dynamics rigid are derived on Lie group SE(3), where failures saturation taken into account. Then, 6-DOF extended state observer is proposed by using terminal sliding mode technique...

In December 2021, the National Conference on Education Informatization Work was held, proposing digital transformation of traditional schools. With advancement global digitalization, value impact intelligent education society is inestimable. How to make normal university students improve awareness applying data in future teaching trend big data, cultivate their initiative learning teachers' literacy courses, ability obtain information, and enable them correctly process relevant further...