64,444 research outputs found
Phase protection system for ac power lines
The system described provides protection for phase sensitive loads from being or remaining connected to ac power lines whenever a phase reversal occurs. It comprises a solid state phase detection circuit, a dc power relay circuit, an ac-to-dc converter for energizing the relay circuit, and a bistable four terminal transducer coupled between the phase detection circuit and the power relay circuit, for controlling both circuits
Vector potentials in gauge theories in flat spacetime
A recent suggestion that vector potentials in electrodynamics (ED) are
nontensorial objects under 4D frame rotations is found to be both unnecessary
and confusing. As traditionally used in ED, a vector potential always
transforms homogeneously under 4D rotations in spacetime, but if the gauge is
changed by the rotation, one can restore the gauge back to the original gauge
by adding an inhomogeneous term. It is then "not a 4-vector", but two: one for
rotation and one for translation. For such a gauge, it is much more important
to preserve {\it explicit} homogeneous Lorentz covariance by simply skipping
the troublesome gauge-restoration step. A gauge-independent separation of
into a dynamical term and a non-dynamical term in Abelian gauge theories is
re-defined more generally as the terms caused by the presence and absence
respectively of the 4-current term in the inhomogeneous Maxwell equations for
. Such a separation {\it cannot} in general be extended to non-Abelian
theories where satisfies nonlinear differential equations. However, in the
linearized iterative solution that is perturbation theory, the usual Abelian
quantizations in the usual gauges can be used. Some nonlinear complications are
briefly reviewed.Comment: 7 page
Mobile content personalisation using intelligent user profile approach
As there are several limitations using mobile internet, mobile content personalisation seems to be an alternative to enhance the experience of using mobile internet. In this paper, we propose the mobile content personalisation framework to facilitate collaboration between the client and the server. This paper investigates clustering and classification techniques using K-means and Artificial Neural Networks (ANN) to predict user's desired content and WAP pages based on device's listed-oriented menu approach. We make use of the user profile and user's information ranking matrix to make prediction of the desired information for the user. Experimental results show that it can generate promising prediction. The results show that it works best when used for predicting 1 matched menu item on the screen
Client-side mobile user profile for content management using data mining techniques
Mobile device can be used as a medium to send and receive the mobile internet content. However, there are several limitations using mobile internet. Content personalisation has been viewed as an important area when using mobile internet. In order for personalisation to be successful, understanding the user is important. In this paper, we explore the implementation of the user profile at client-side, which may be used whenever user connect to the mobile content provider. The client-side user profile can help to free the provider in performing analysis by using data mining technique at the mobile device. This research investigates the conceptual idea of using clustering and classification of user profile at the client-site mobile. In this paper, we applied K-means and compared several other classification algorithms like TwoStep, Kohenen and Anomaly to determine the boundaries of the important factors using information ranking separation
Treatment of control data in lunar phototriangulation
In lunar phototriangulation, there is a complete lack of accurate ground control points. The accuracy analysis of the results of lunar phototriangulation must, therefore, be completely dependent on statistical procedure. It was the objective of this investigation to examine the validity of the commonly used statistical procedures, and to develop both mathematical techniques and computer softwares for evaluating (1) the accuracy of lunar phototriangulation; (2) the contribution of the different types of photo support data on the accuracy of lunar phototriangulation; (3) accuracy of absolute orientation as a function of the accuracy and distribution of both the ground and model points; and (4) the relative slope accuracy between any triangulated pass points
Construction and Applications of CRT Sequences
Protocol sequences are used for channel access in the collision channel
without feedback. Each user accesses the channel according to a deterministic
zero-one pattern, called the protocol sequence. In order to minimize
fluctuation of throughput due to delay offsets, we want to construct protocol
sequences whose pairwise Hamming cross-correlation is as close to a constant as
possible. In this paper, we present a construction of protocol sequences which
is based on the bijective mapping between one-dimensional sequence and
two-dimensional array by the Chinese Remainder Theorem (CRT). In the
application to the collision channel without feedback, a worst-case lower bound
on system throughput is derived.Comment: 16 pages, 5 figures. Some typos in Section V are correcte
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