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The design and development of small scale aerial robots has been currently hindered by the lack of applicability of conventional aerodynamics equations/principles to the small size vehicles flying at extremely low Reynolds number. Also conventional optimization techniques and algorithms have shown very limited success in these applications. Trial and error has been the most effective design tool in...
Displacement amplification ratio and input stiffness are significant design characteristics for an ultra-precision positioning flexure-based compliant mechanism. Early and accurate performance prediction models can significantly improve the reliability and availability of product in the field of ultra-precision positioning, but Existing theoretic models cannot predict its characteristics accurately...
This paper presents the structure design and analysis of a novel compliant gripper based on the Scott-Russell (SR) mechanism. An SR mechanism in combination with a parallelogram mechanism enables the achievement of a pure translation of the gripper tips, which is attractive for practical micromanipulation and microassembly applications. As compared with traditional pure-translation grippers, the reported...
Scientific analysis of the scanned model can enhance interpretation of heritage. Visualization methods that use various rendering algorithm can reveal geometric features of the model clearly, which may not be recognized in pictures or even on the site. Thus it helps to overcome the subjectivity or restriction in first-hand interpretation. In this paper, visualization of scanned model for interpretation...
In this paper it is presented a simulation analysis of electric fields generated by lightning channels with tortuosity. The tortuosity of the channel is reproduced by means of a numerical algorithm that takes into account statistical characterizations made by different authors observing real lightning channels, so the macroscale tortuosity of the simulated channel is similar to the one recorded in...
Static program analysis for bug detection in industrial C/C++ code has many challenges. One of them is to analyze pointer and pointer structures efficiently. While there has been much research into various aspects of pointer analysis either for compiler optimization or for verification tasks, both classical categories are not optimized for bug detection, where speed and precision are important, but...
Previous studies have reported that nasal consonants in Mandarin are an important source of individual information. This study conducts morphological analysis and acoustic modeling of the nasal and paranasal cavities to investigate the effects of the nasal cavity on speaker characteristics. Morphological analysis was carried out on the perpendicular planes to the nasal tract and the cross-sectional...
Active Appearance Modeling (AAM) offers acceptable face synthesis performance when applied to person-specific modeling applications. The aim of the work presented in this paper is to enable AAM to model and synthesize more accurately previously unseen face images. Thus a clustering process based on shape similarities is incorporated in the system and applied prior to conventional AAM modeling, to...
Modified Cambridge model has widely applications in analysis of soft soil, and the parameters are always obtained with some extra soil mechanics experimental. Here we summarizes some methods to estimate the parameters of modified Cambridge model without extra experiment. With these methods we could estimate every parameter of modified Cambridge model just through the general geotechnical investigation...
The grate bar is one of the important parts of the inertia resonance probability screen system, which is the main component of coal unloading system in the power plant. Therefore, the dynamic characteristic of the grate bar is studied in this paper. Based on the 3D model, the theory modal analysis of the inertia resonance probability screen grate bar was conducted with ANSYS software and the experimental...
In a previous 2D parametric study, it was found that the die size appear to have no significant effect on the likelihood of delamination at the pad-encapsulant interface in a plastic-encapsulated IC package. This trend appears to be counter intuitive since in practice, it is known that larger dies are more likely to delaminate in comparison with smaller ones. The authors had speculated that this could...
In this work, we depart from the cell-based percolation model of gate dielectric breakdown (BD) to propose analytical models for the SET and RESET statistics in resistive switching memory (RRAM). The SET or RESET statistics model consists of two basic elements: (i) a cell-based geometrical model to describe the dependence of the resistive switching (RS) distribution on the defect generation in the...
Automated bone segmentation is one of the most challenging problems in medical imaging. The increasingly demanded MR imaging suffers from low contrast and signal-to-noise ratio when it comes to bones. To increase the segmentation robustness, a prior model of the structure could guide the segmentation when explicit information is missing or weakly presented. Statistical Shape Models (SSMs) are efficient...
The most common approach adopted in the literatures to study the aggregated ICT (Inter-Contact Time) is focused on a certain mobile wireless network, and then characterizing the ICT in this type of network. Up to now, it still lacks a general approach to model the aggregated ICT effectively in different type of networks. This paper proposes a new approach to characterize the aggregated ICT based on...
This paper explores the characterization of mem-ristive systems utilizing the characteristive curve of state and analyze the special role of initial condition in such history-dependent systems. The specifically studied system focuses on the titanium dioxide memristor based on the nonlinear ionic drift model of Joglekar. We derive first the characteristic curve of state (CCOS) as the analytical solution...
Significant improvements have been recently achieved in both quality and realism of computer generated characters, which are nowadays often very difficult to be distinguished from real ones. However, generating highly realistic facial expressions is still a challenging issue, since synthetic expressions usually follow a repetitive pattern, while in natural faces the same expression is usually produced...
One of the major power quality concerns is harmonic distortion that is caused by the non-linearity of customer loads. Hence, harmonic studies have become an important part in power system modeling, simulation and analysis. This paper presents an application of an Open-source Distribution System Simulator (OpenDSS) for harmonic analysis in time series. Two test case studies, with and without harmonic...
This paper takes the dichloropropane tank area in a chemical company in service for an example, and adopts the fire simulation software FDS to make numerical simulation for the whole-area pool fire accident in the dichloropropane tank. The variation of flame and the flue gas in the combustion process of pool fire is obtained from the simulation. For the flame, in the early pool fire, the flame is...
Although present X-ray scattering techniques can provide tremendous information on the nano-structural properties of materials that are valuable in the design and fabrication of energy-relevant nano-devices, a primary challenge remains in the analyses of such data. In this paper we describe a high-performance, flexible, and scalable Grazing Incidence Small Angle X-ray Scattering simulation algorithm...
We explore the problem of characterizing fragments using Par-aView in situ with an explosion simulation. By running in situ we can see a much higher temporal view of the data as well as potentially compress the output to only those statistics about fragments we care about. However, the fragment finding must be able to scale as well as the simulation. In order to achieve the necessary scales, we borrow...
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