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Aircraft loss-of-control (LOC) is the major contributing factor to fatal accidents and is characterised by the manoeuvring of aircraft beyond the allowable flight envelopes. This paper proposes an online learning and inference based method for aircraft flight envelope estimation in order to prevent aircraft LOC. The lift and drag coefficients of the aircraft are identified online using an extended...
Aircraft centre of gravity (C.G.) is important for aircraft safety and performance. This paper proposes the use of Gaussian process regression (GPR) models for the estimation of the C.G. location of fixed-wing aircraft. The major benefit of using a GPR model is that it is a data-based approach explicitly tackling uncertainties caused by the quality and quantity of the data as well as sensor measurement...
A cloud platform prototype for Computer Aided Engineering (CAE) simulation is developed for the large-scale parallel CAE simulation application. We propose the architecture of the platform. In the architecture, we propose a technology called CAE Application Packaging Template (CAE-APT) for integrating heterogeneous CAE softwares based on "Tianhe No.1". We discuss the design ideas and the...
The noteworthy feature of aircraft with distribute propulsion configuration is the integration of the fuselage and semi-embedded distributed propulsion system, which brings strong coupling effects between flight and propulsion systems. The aim of this article is to systematically investigate the coupling effects due to boundary layer ingestion under different flight states. As the basis, the definition...
There are some limitations when analyzing and studying Internetware by using traditional software reliability theory and method which is not adaptive to the open, dynamic and changeable network environment. Based on the basic principle, the characteristics and the analysis of Internetware, the theory and the technology of Internetware reliability are innovated and developed. The research status, the...
We present a computational model for predicting the net solar energy conversion efficiency of a single-junction solar cell backed by a solid-state photon upconversion nanostructure. We model the upconversion process using a series of kinetic rate equations to calculate equilibrium populations. We determine the upconversion quantum efficiency (UQE) of the proposed device as a function of intentionally...
Virtual reality is a research direction with rapid development, has important significance for national defense and engineering practice. The wave modeling is an important topic in the research of virtual reality. And it is applied to the naval ships manufacture, the naval gun firing experiment, and Marine virtual training, etc. It laid the virtual exercise, warships and submarines test basis. From...
Multiple recent neuroimaging studies have demonstrated that the human brain's function undergoes remarkable temporal dynamics. However, quantitative characterization and modeling of such functional dynamics have been rarely explored. To fill this gap, we presents a novel Bayesian connectivity change point model (BCCPM), to analyze the joint probabilities among the nodes of brain networks between different...
With the development of the economy and rapid population growth, the range of contaminated groundwater is getting bigger and bigger. Groundwater pollution has a slow process, and it is not easy to find and difficult to control. Once polluted, it takes more than ten years, sometimes even decades to recover. Groundwater pollution has a close relationship with people's health. This paper mainly discusses...
With electronic production tending to be large scale integration, digital, lightweight, small-lot and diversification, the traditional bumping fabrication technologies aren't compatible with the electronic production such as the personalized, medical implants, military and new product development and so on for cost problem. And then the single chip bumping technology is introduced, among which the...
Many existing implementations of TCP congestion control algorithms are mainly designed for public internet, which are needed to consider RTTs fairness and bandwidth and time-delay of unknown network. But these principles have shortcomings in data transmission in long-distance and high bandwidth-delay private network, which seriously affects the transmission performance and bandwidth utilization. Based...
While the difficulty and complexity of simulation system increasing, the development efficiency and execution performance of the large-scale distributed simulation system (LSDSS) must be improved effectively. Furthermore, while the multi-core has become popular hardware, yet the traditional federate mechanism couldn't utilize and schedule the CPU resource, which would limit the simulation performance...
A latency-hiding algorithm for the parallelization of large scale agent-based model simulations (ABMS) on parallel/distributed computing platform is proposed. The key idea of this algorithm is using redundant computations to hide communication latencies. An analytical model for this algorithm is presented to tell how to select R value to reach the best speedup. Compared to B+2R algorithm [1], theoretical...
Data-parallel programming model (DPPM for short) specialized for data-intensive computing becomes considerable popular because it simplifies the development of distributed parallel programs. DPPMs are classified into two categories: 1) MapReduce, Dryad; and 2) Piccolo, Function Flow, etc. based on their maturity. We analyze and compare these typical models by deployment, application, data partition,...
Software as a Service is becoming a popular research field in software development for its feature of low costing entry, easy implementation and zero infrastructure. SaaS is a multi tenant model which is different from traditional software in user data security, software development and deployment. This paper firstly analyses SaaS architecture, secondly introduces key technology of SaaS system from...
Recently bag-of-words (BoW) model having been widely used in textual information processing has been extended into many tasks in visual domain such as image classification, scene analysis, image annotation and image retrieval, namely bag-of-visual-words (BoVW) model. Therefore, it is essential to create an effective visual vocabulary. Most of existing approaches create visual vocabularies from image...
In view of the present virtual hysteroscopy laparoscopic system problems, combined with various processing algorithms, discussed deeply the key techniques about collision detection, deformation computation, and path planning of virtual hysteroscopy laparoscopy surgery simulator system. Subsequently, these three key techniques involved in the virtual hysteroscopy laparoscopy surgery simulator system...
In order to accurately construct the modeling of a telerobot in a virtual environment and reduce the work of developing the graphic design, this paper took the XK-II telerobot as a prototype, using SolidWorks modeling and interactive graphics programming with Open Inventor. First of all, we constructed each entities' geometric model in SolidWorks, and then, derived these models into VRML files and...
This study explores students' continuance intention in e-learning education system by synthesizing Bhattacherjee's IS continuance theory as basis with the unified theory of acceptance and use of technology (UTAUT), and innovation diffusion theory. The integrated model was empirically tested with 180 bachelor students who had the experience of using the e-learning education system. The results indicate...
Abdominal aortic aneurysm (AAA) rupture is believed to occur when the mechanical stress acting on the wall exceeds the strength of the wall tissue. In endovascular aneurysm repair, a stent-graft in a catheter is released at the aneurysm site to form a new blood vessel and protect the weakened AAA wall from the pulsatile pressure and, hence, possible rupture. In this paper, we propose a framework to...
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