1,883 research outputs found
A Note on the Shannon Entropy of Short Sequences
For source sequences of length L symbols we proposed to use a more realistic
value to the usual benchmark of number of code letters by source letters. Our
idea is based on a quantifier of information fluctuation of a source, F(U),
which corresponds to the second central moment of the random variable that
measures the information content of a source symbol. An alternative
interpretation of typical sequences is additionally provided through this
approach.Comment: 3 figure
Reply to "Comment on 'Precision measurement of the Casimir-Lifshitz force in a fluid'"
We have reviewed the Comment of Geyer et al. [arXiv:0708.1548] concerning our
recent work [Phys. Rev. A 75, 060102 (R) (2007)], and while we disagree with
their criticisms, we acknowledge them for giving us the opportunity to add
interesting addition material and a more detailed description of our
experiment. We describe further our calculation and explain why a more
sophisticated model is not warranted. We also present detailed experiments on
the effects of electrostatic forces in our measurements and show that the
contribution due to work function differences is small and that the residual
electrostatic force is dominated by trapped charges and external fields.
Finally, we estimate the effect of double layer interactions. These additional
calculations and measurements support our original conclusion that the
experimental results are consistent with the Lifshitz theory
Mobile Quantification and Therapy Course Tracking for Gait Rehabilitation
This paper presents a novel autonomous quality metric to quantify the
rehabilitations progress of subjects with knee/hip operations. The presented
method supports digital analysis of human gait patterns using smartphones. The
algorithm related to the autonomous metric utilizes calibrated acceleration,
gyroscope and magnetometer signals from seven Inertial Measurement Unit
attached on the lower body in order to classify and generate the grading system
values. The developed Android application connects the seven Inertial
Measurement Units via Bluetooth and performs the data acquisition and
processing in real-time. In total nine features per acceleration direction and
lower body joint angle are calculated and extracted in real-time to achieve a
fast feedback to the user. We compare the classification accuracy and
quantification capabilities of Linear Discriminant Analysis, Principal
Component Analysis and Naive Bayes algorithms. The presented system is able to
classify patients and control subjects with an accuracy of up to 100\%. The
outcomes can be saved on the device or transmitted to treating physicians for
later control of the subject's improvements and the efficiency of physiotherapy
treatments in motor rehabilitation. The proposed autonomous quality metric
solution bears great potential to be used and deployed to support digital
healthcare and therapy.Comment: 5 Page
Assessment of wind energy potential of two sites in North-East, Nigeria
The study is used to assess the wind energy potential of Maiduguri and Potiskum, two sites in North-East,
Nigeria. 21 years (1987e2007) monthly mean wind data at 10 m height were assessed from the Nigeria
Meteorological department and subjected to 2-parameter Weibull and other statistical analyzes. The
result showed that average monthly mean wind speed variation for Potiskum ranged from 3.90 to
5.85 m/s, while for Maiduguri, it ranged from 4.35 to 6.33 m/s. Seasonally, data variation between the dry
and wet seasons revealed that, the mean wind speed variation for Potiskum ranged from 4.46 (for dry) to
5.16 m/s (for wet), while for Maiduguri it ranged from 5.10 (dry) to 5.59 m/s (wet). The wind power
density variation based on the Weibull analysis ranged from 102.54 to 300.15 W/m2 for Potiskum and it
ranged from 114.77 to 360.04 W/m2 for Maiduguri respectively. Moreover, Maiduguri was found to be the
better of the sites in terms of monthly and seasonal variation of mean wind speed, but they both can be
suitable for stand alone and medium scale wind power generation
DURABILITY OF ROAD PAVEMENT AGAINST TIDAL INUNDATION
Semarang, as one of cities located on the North Coast of Java Island, experienced tidal inundation for
years. The presence of inundation has adverse effect on road infrastructure, especially on coastal
arterial roads, which most of them made of mixture with conventional asphalt. To overcome this
problem, it was proposed to use polymer modified asphalt (PMA) for the mixture. This study was
carried out to evaluate the durability of the mixture with PMA that continuously immersed in the tidal
water, to simulate the occurrence of some road infrastructure in Semarang which was inundated after
tidal events. For this purpose, five immersion periods and three kinds of tidal inundation were
selected. To evaluate the durability of the mixtures after immersion, two durability indices were used.
The results showed that the water pressure (during immersion) could be one of the main causes of
strength loss of the mixtures; however, if the water consists of certain chemical compound at sufficient
amount, it could also contribute in reducing greatly the durability of the mixture
Effects of Na2Cr2O7 Inhibitor on the Corrosion Potential Response of Steel Reinforced Concrete in Saline Medium
Electrochemical monitoring method of the open circuit potential was used to investigate the effect of
the concentrations of Na2Cr2O7 on the corrosion potential response of steel reinforced concrete in
sodium chloride medium. In the study, five different concentrations of Na2Cr2O7 admixtures were
employed in a system of replicated samples of steel-reinforced concrete specimens partially
immersed in 3.5% NaCl to simulate marine and saline environments. Forty days measured responses
from these were subjected to the statistical analyses of the Normal and the Weibull distribution
functions and tested using the Kolmogorov-Smirnov goodness of fit criteria. Results obtained from the
analyses identified 4 g Na2Cr2O7 with optimal averaged potential response inhibition performance by
the Normal model which showed better agreements in its models of Na2Cr2O7 potential test data than
that obtained from the Weibull model of the same data. These bear pertinent implications on the need
for suitability studies of appropriate statistical distribution for studying performance of corrosion
inhibitors even as suggestions were proffered for addressing results conflicts among replicates of
steel reinforced concrete samples employed
Qualitative ordinal scales: the concept of ordinal range
Many practical problems of quality control involve the use of ordinal scales. Questionnaires planned to collect judgments on qualitative or linguistic scales, whose levels are terms such as "good," "bad," "medium," etc., are extensively used both in evaluating service quality and in visual controls for manufacturing industry. In an ordinal environment, the concept of distance between two generic levels of the same scale is not defined. Therefore, a population (universe) of judgments cannot be described using "traditional" statistical distributions since they are based on the notion of distance. The concept of "distribution shape" cannot be defined as well. In this article, we introduce a new statistical entity, the so-called ordinal distribution, to describe a population of judgments expressed on an ordinal scale. We also discuss which of the traditional location and dispersion measures can be used in this context and we briefly analyze some of their properties. A new dispersion measure, the ordinal range, as an extension of the cardinal range to ordinal scales, is then proposed. A practical application in the field of quality is developed throughout the articl
Microelectronics Process Engineering at San Jose State University: A Manufacturing-Oriented Interdisciplinary Degree Program
San Jose State University\u27s new interdisciplinary curriculum in Microelectronics Process Engineering is described. This baccalaureate program emphasizes hands-on thin-film fabrication experience, manufacturing methods such as statistical process control, and fundamentals of materials science and semiconductor device physics. Each course of the core laboratory sequence integrates fabrication knowledge with process engineering and manufacturing methods. The curriculum development process relies on clearly defined and detailed program and course learning objectives. We also briefly discuss our strategy of making process engineering experiences accessible for all engineering students through both Lab Module and Statistics Module series
- …