1,721,432 research outputs found
Gesture spotting from continuous hand motion
No full textThis paper proposes a new method of gesture spotting based on the Hidden Markov Model (HMM) that extracts meaningful gestures from continuous hand motion. To remove non-gesture patterns from input patterns, we introduce the threshold model that calculates the threshold likelihood of the input pattern and helps to qualify an input pattern as a gesture. The proposed method extracts gestures with 93.38% reliability. (C) 1998 Elsevier Science B.V. All rights reserved
An HMM-based threshold model approach for gesture recognition
No full textThe task of automatic gesture recognition is highly challenging due to the presence of unpredictable and ambiguous nongesture hand motions. In this paper, a new method is developed using the Hidden Markov Model based technique. To handle nongesture patterns, we introduce the concept of a threshold model that calculates the likelihood threshold of an input pattern and provides a confirmation mechanism for the provisionally matched gesture patterns. The threshold model is a weak model for all trained gestures in the sense that its likelihood is smaller than that of the dedicated gesture model for a given gesture. Consequently, the likelihood can be used as an adaptive threshold for selecting proper gesture model. It has, however, a large number of states and needs to be reduced because the threshold model is constructed by collecting the states of all gesture models in the system. To overcome this problem, the states with similar probability distributions are merged, utilizing the relative entropy measure. Experimental results show that the proposed method can successfully extract trained gestures from continuous hand motion with 93.14 percent reliability
Passive all-optical clock signal extractor for non-return-to-zero signals
No full textThe authors propose and demonstrate a new all-optical clock signal extraction from non-return-to-zero signals for optical clock recovery. The signal extractor is a simple passive optical interferometer based on polarisation maintaining fibre
Effect of second phase after-heat treatment on the thermal conductivity of AlN ceramics
No full textThe high thermal conductivity of Aluminum nitride, coupled with its high electrical resistivity and nontoxic nature, makes it a very promising material for electronic substrate. In this study, microstructural characterization on the thermal conductivity of AlN ceramics was investigated. An AlN ceramic was prepared with a dopant Y2O3 under a reducing nitrogen atmosphere with carbon. In order to obtain high thermal conductivity, cooling rate control and after-heat treatment was carried out. Morphology of the second phase was characterized using scanning electron microscopy (SEM). SEM studies showed that the microstructural change caused by after-heat treatment have a major influence on the thermal conductivity
An Analytical Calculation Method of Acoustics Radiation from a Clamped Layered Circular Plate Contacting with Inviscid Fluid
No full textSoluble Epoxide Hydrolase Inhibitors: New Molecules with Potential for Use in Veterinary Medicine
No full textTreatments for inflammation and pain are important consideration in human and veterinary medicine. The
classical drugs for treatments of inflammation and pain act by inhibition of cyclooxygenase and lypoxygenase
pathways. However, there is still a need to develop new veterinary drugs and trials to apply human drugs
to the veterinary field in order to increase the veterinary drug armamentarium. However, it is pivotal to
experimentally test human drugs and therapies in veterinary species before veterinary clinical applications.
The soluble epoxide hydrolase inhibitors (sEHIs), are novel active ingredients shown to have a number of
beneficial effects. This has been especially demonstrated in many animal models in relation to inflammation
and pain. The present review reports the state of the art of soluble epoxide hydrolase inhibitors and suggests
their potential use in veterinary medicine
A simple and color-free WDM-passive optical network using spectrum-sliced Fabry-Perot laser diodes
No full textWe propose and demonstrate a simple and color-free wavelength-division-multiplexing passive optical network (WDM-PON) using spectrum-sliced Fabry-Perot laser diodes (F-P LDs). Due to its low front facet reflectivity (similar to 0.1%), the F-P LD shows a broadband lasing spectrum and reduced mode partition noise. By utilizing multiple peaks that are separated by the free-spectral range of the cyclic arrayed waveguide gratings, the 16-channel WDM-PON is successfully demonstrated at 155 Mb/s
Thermodynamic parameters of poly(lactic acid) solutions in dialkyl phthalate
No full textSome of thermodynamic parameters for poly(lactic acid) (PLA)/dialkyl phthalate systems have been investigated. Both poly(DL-lactic acid) (PDLLA) and poly(L-lactic acid) (PLLA), which are stereoisomers of PLA, were used and a series of 1,2-dialkyl phthalates with different alkyl chain, from methyl to hexyl, was adopted as a solvent. Theta temperatures of PLA/dialkyl phthalate system were determined and subsequently the second virial coefficient and the interaction parameter were evaluated. Theta temperature was determined by the extrapolation of the highest liquid-liquid phase separation temperatures and Zimm plots were constructed by static light scattering to obtain second virial coefficient and z-average radius of gyration. Second virial coefficient and z-average radius of gyration was examined quantitatively as a function of temperature and solvent. Thermodynamic parameters that could not be obtained experimentally were calculated based on the Flory-Huggins theory. (C) 2004 Elsevier Ltd. All rights reserved
Mathematical model of diesel fuel injection equipment incorporating non-linear fuel injection
No full textStringent legislation on vehicle noise and pollutant emissions has created increasingly severe demands on the fuel injection equipment fitted to automotive diesel engines. In particular, the use of high pressure across smaller nozzle holes to reduce particulate emissions has increased the effects of non-linear compression of the fuel in the passages and volumes in the systems. The mathematical model to simulate high pressure injection system needs to incorporate this high-pressure non-linear behaviour. Condensation, which is continuous across the fuel phase boundary, has been introduced to replace the pressure. This non-linearity in compression has been incorporated into the wave equations by using a non-linear equation of state where the bulk modulus is assumed to change linearly with pressure. The calculation methods for wave disturbances and losses have been investigated and improved methods are presented. The model has been validated with a rotary pump-pipe-nozzle system, but it can be equally applied to other designs such as unit injector and common rail systems. Even though the linear model prediction is in accord with experimental results, the non-linear model predictions of injection timing and peak line pressure are significantly better.Financial support provided for this project by Korean Goverment, thorugh the scheme of National Research Laborator
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