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The investigation of dynamics of the real-life natural vibrations in structures, compared with the simulated by finite-element model frequency values and their variations, could be used for monitoring of the structural health of the composite materials. Experimental modal analysis of an example maritime composite panel is presented in the current work. The previously developed setup of the measurement...
The present paper deals with the path planning of a mobile object and optimisation of the locally generated safe path. It proposes a trajectory generation algorithm using fuzzy logic controllers in both directions propagation and obstacles avoidance. Associated with a workspace modelling, the algorithm tries to obtain a quasi-optimal global safe path for an autonomous mobile object which has to move...
In this paper, we propose a new framework for compressive video sensing (CVS) that exploits the inherent spatial and temporal redundancies of a video sequence, effectively. The proposed method splits the video sequence into the key and non-key frames followed by dividing each frame into the small non-overlapping blocks of equal sizes. At the decoder side, the key frames are reconstructed using adaptively...
For the world's first Offshore Floating Dock(OFD), the dimension control system and method to aim at managing the dimension of offshore blocks in the process of erection are developed. This paper introduces the dimension control system and deals with the method of creating a simplified OFD model and of optimizing ballast-water plan to satisfy the demanded dimension of erected offshore plant blocks...
During the last decade, energy efficiency became one of the most challenging research fields in the IT domain. After optimising large-scaled hardware infrastructures, e.g. computing centres or server clusters, nowadays the focus has changed rapidly. Current R&D projects deal with two major areas. On the one hand embedded, energy self-sufficient system architectures and on the other hand wireless...
Cooperative systems supporting remote teams are based on distributed software architectures. Underneath most of these architectures is the Internet Protocol version 4 (IPv4), which acts as technological backbone. Despite its strengths, the IPv4 also entails challenges for developers of such systems for getting system messages through firewalls without increasing latency and bringing delays for users...
Internet of things (IoT) has been researched in recently years. The Savant as a midware provides the data collecting and pre-processing for the IoT applications. Data grid can aggregate the resources in the IoT. Using data grid to build the Savant enables the Savant manage large scale data and optimizes the efficiency of the resources in IoT. In this paper, the data in the IoT is classified, and a...
Advances in technology have led to development of wearable sensing, computing and communication devices that can be woven into the physical environment of our daily lives, enabling a large variety of new applications in several domains including wellness and health care. Despite their tremendous potential to impact our lives, wearable health monitoring systems face a number of hurdles to become a...
A micro flexible gripper using piezoelectric actuator was produced. Design, fabrication and tests of the microgripper were performed. The geometric size of the microgripper was optimized. After modeling the micro-gripper, finite element method (FEM) was performed to investigate the flexible mechanism, and Based on the optimal results, a prototype of the microgripper was tested by experiment.
The current popular wireless sensor network operating system to be large and complex, Leading to the size of program after compiling is too large and difficult to put into the memory of low-cost processors. In this paper, for the improvement of the program size too large problem, we propose a Lightweight wireless sensor network operating systems (LOS) that is based TinyOS. Our LOS adapts C programming...
The leakage and diffusion accident of inflammable and explosive toxic gas has become a serious problem in the field of environment and security. Based on the optimized three-dimensional finite element model (FEM3) and the actual condition in complex and sealed space, a three-dimensional simulation system is developed to simulate the dynamic process of leakage and diffusion of gas in complex and sealed...
Admission control plays an important role in providing Quality of Service (QoS) guarantees for wireless mesh networks (WMNs). Multipath routing can improve network performance in reliability and load balancing. However, when the multipath routing are adopted in 802.11-based WMNs, the transmission with bandwidth assurance is facing rigorous challenges. In this paper, a novel joint design of multipath...
This paper presents a model-driven approach to developing pervasive computing applications that exploits design time information to support the engineering of planning and optimisation algorithms that reflect the presence of uncertainty, dynamism and complexity in the application domain. In particular the task of generating code to implement planning and optimisation algorithms in pervasive computing...
This paper addresses the energy-based localization problem in wireless sensor networks. The maximum likelihood (ML) location estimation problem is a difficult optimization problem due to the non-convexity of the objective function, and finding an exact solution is difficult. In this work, an approximate solution to the ML localization is presented, by relaxing the minimization problem into semidefinite...
In this paper we consider a single cognitive radio seeking a transmission opportunity by sequentially sensing a number of statistically independent primary channels. We study the joint optimization of the time spent to sense a channel, the decision threshold to determine whether the channel is free or busy, together with the order with which the channels are sensed. The sensing time and decision threshold...
We investigate the channel assignment problem in a cluster-based multi-channel cognitive radio sensor network in this paper. Due to the inherent power and resource constraints of sensor networks, energy efficiency is the primary concern for network design. An R-coefficient is developed to estimate the predicted residual energy using sensor information (current residual energy and expected energy consumption)...
In switching power converters, the turn on/off process of switches is crucial for the reliability and efficiency of the converter. In general, optimum switching is challenging, and it is particularly difficult for hard switching. The MOSFET synchronous buck converter having wide applications due to high switching speed and low loss, however, operates in hard switching and needs a good timing control...
Minimizing the sensing activity during the pre-attack phase while meeting the performance requirements is critical for reducing the operational costs of chemical sensor networks. In this paper, we present a formal problem formulation for this optimization problem, and propose a decentralized, dynamic sensor activation protocol for meeting this goal. We analyze the behavior of the activation protocol...
In this paper, we address the maximal lifetime scheduling problem in sensor surveillance systems with directional sensors. The sensors are directional in sensing objects (or watching targets) and their sensing orientations can be adjusted dynamically. Given a set of sensors and a set of targets in a plane, each target needs to be watched all the time and a sensor can watch all the targets within its...
With the employment of cognitive radio technology, dynamic spectrum management has the potential to solve the underused spectrum problem. In this paper, we introduce and compare two periodic sensing and transmission schemes for secondary users (SUs) in cognitive radio networks. In an attempt to maximize the exploitation of spectrum opportunities in these two schemes, we analyze three metrics of SUs,...
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