11,633 research outputs found
Vehicle Accident Alert and Locator (VAAL)
An emergency is a deviation from planned or expected behaviour or a course of event that endangers or adversely affects people, property, or the environment. This paper reports a complete research work in accident (automobile) emergency alert situation. The authors were able to programme a GPS / GSM module incorporating a crash detector to report automatically via the GSM communication platform (using SMS messaging) to the nearest agencies such as police posts, hospitals, fire services etc, giving the exact position of the point where the crash had occurred. This will allow early response and rescue of accident victims; saving lives and properties. The paper reports its experimental results, gives appropriate conclusions and recommendations
Analysis of Capacity Limitation in Nigerian GSM Networks and the Effects on Service Providers and Subscribers
The performance of GSM network is measured in terms of KPIs (Key Performance
Indicators) based on statistics generated from the network. The most important of these
performance indicators from the operators’ perspective are BER (bit error rate), the FER
(frame error rate) and the DCR (dropped call rate).
The Dropped Call Rate (DCR) is a measure of the calls dropped in a network as it gives a
quick overview of network quality and revenues lost. This makes it one of the most
important parameters in network optimization. At the frame level in the NMS (Network
Management System), the DCR is measured against the Slow Associated Control Channel
(SACCH) frame. If the SACCH frame is not received, then it is considered to be dropped
calls.
For this work data was acquired form the Network Management System of various GSM
operators in Nigeria (e.g. MTN, Celtel, Globacom etc.). The acquired data was analyzed
to statistically illustrate the extent of revenue that is lost as a result of dropped calls and
the consequent impact on the customers/subscribers
On the Power Spectral Density of the GSM Signaling Scheme
In this paper, the Power Spectral Density of encoded Gaussian Minimum Shift Keying
(GMSK) which is the Signaling Scheme of the Global System for Mobile Communication
(GSM) is derived by a combined approach of the autocorrelation method and Markov
Process. In the analysis, the Amplitude Modulated Pulse decomposition proposed by P.
Laurent is employed to ease computation. Encoding of the message data utilizes
Convolutional Code of rate1/2. Results are for both the uncoded and coded waveform
comparing variation in power spread over a range of frequency
Outbursts of Young Stellar Objects
We argue that the outbursts of the FU Orionis stars occur on timescales which
are much longer than expected from the standard disc instability model with
\alpha_{c} \gtrsim 10^{-3}. The outburst, recurrence, and rise times are
consistent with the idea that the accretion disc in these objects is truncated
at a radius R_{i} \sim 40 \rsun. In agreement with a number of previous authors
we suggest that the inner regions of the accretion discs in FU Ori objects are
evacuated by the action of a magnetic propeller anchored on the central star.
We develop an analytic solution for the steady state structure of an accretion
disc in the presence of a central magnetic torque, and present numerical
calculations to follow its time evolution. These calculations confirm that a
recurrence time that is consistent with observations can be obtained by
selecting appropriate values for viscosity and magnetic field strength.Comment: 13 pages, 7 figures, accepted by MNRA
Development of e-SIWES Portal: A Web based Platform for Student Industrial Work Experience Scheme (SIWES) Management
We developed the e-SIWES portal in order to enhance the manual task of carrying out SIWES activities such as registration, dissemination of information, filling of log book for students’ day-to-day activities and supervision/assessment by lecturers and industry based supervisors. The portal is web-based and allows all tasks to be carried out using the personal computer and the Internet. We digitized the SIWES logbook and assessment forms for filling by students and grading by the supervisors electronically. This will allow supervisors to be assigned immediately the students commence their industrial training and facilitate their monitoring in real-time. With the e-SIWES portal, important messages can be broadcast to all students at once and on a prompt and regular basis
National Hospital Management Portal (NHMP): a framework for e-health implementation
Health information represents the main basis for health decisionmaking
process and there have been some efforts to increase access to health information in developing countries. However, most of these efforts are based on the internet which has minimal penetration especially in the rural and sub-urban part of developing countries. In this work, a platform for medical record acquisition via the ubiquitous 2.5G/3G wireless communications technologies is presented. The National Hospital Management Portal (NHMP)platform has a central database at each specific country’s national hospita
Estimating An Optimal Backpropagation Algorithm for Training An ANN with the EGFR Exon 19 Nucleotide Sequence: An Electronic Diagnostic Basis for Non–Small Cell Lung Cancer(NSCLC)
One of the most common forms of medical malpractices globally is an error in diagnosis. An improper
diagnosis occurs when a doctor fails to identify a disease or report a disease when the patient is actually
healthy. A disease that is commonly misdiagnosed is lung cancer. This cancer type is a major health problem
internationally because it is responsible for 15% of all cancer diagnosis and 29% of all cancer deaths. The two
major sub-types of lung cancer are; small cell lung cancer (about 13%) and non-small cell lung cancer
(%SCLC- about 87%). The chance of surviving lung cancer depends on its correct diagnosis and/or the stage at
the time it is diagnosed. However, recent studies have identified somatic mutations in the epidermal growth
factor receptor (EGFR) gene in a subset of non-small cell lung cancer (%SCLC) tumors. These mutations occur
in the tyrosine kinase domain of the gene. The most predominant of the mutations in all %SCLC patients
examined is deletion mutation in exon 19 and it accounts for approximately 90% of the EGFR-activating
mutations. This makes EGFR genomic sequence a good candidate for implementing an electronic diagnostic
system for %SCLC. In this study aimed at estimating an optimum backpropagation training algorithm for a
genomic based A%% system for %SCLC diagnosis, the nucleotide sequences of EGFR’s exon 19 of a noncancerous
cell were used to train an artificial neural network (A%%). Several A%% back propagation training
algorithms were tested in MATLAB R2008a to obtain an optimal algorithm for training the network. Of the nine
different algorithms tested, we achieved the best performance (i.e. the least mean square error) with the
minimum epoch (training iterations) and training time using the Levenberg-Marquardt algorithm
The steady-state structure of accretion discs in central magnetic fields
We develop a new analytic solution for the steady-state structure of a thin
accretion disc under the influence of a magnetic field that is anchored to the
central star. The solution takes a form similar to that of Shakura and Sunyaev
and tends to their solution as the magnetic moment of the star tends to zero.
As well as the Kramer's law case, we obtain a solution for a general opacity.
The effects of varying the mass transfer rate, spin period and magnetic field
of the star as well as the opacity model applied to the disc are explored for a
range of objects. The solution depends on the position of the magnetic
truncation radius. We propose a new approach for the identification of the
truncation radius and present an analytic expression for its position.Comment: 11 pages, 7 figures, accepted by MNRA
Vibrational overtone initiated unimolecular dissociation of HOCH_2OOH and HOCD_2OOH: Evidence for mode selective behavior
The vibrational overtone induced unimolecular dissociation of HMHP (HOCH2OOH) and HMHP-d2 (HOCD2OOH) into OH and HOCH2O (HOCD2O) fragments is investigated in the region of the 4nuOH and 5nuOH bands. The unimolecular dissociation rates in the threshold region, corresponding to the 4nuOH band, exhibit measurable differences associated with excitation of the OH stretch of the alcohol versus the peroxide functional group, with the higher energy alcohol OH stretching state exhibiting a slower dissociation rate compared to the lower energy peroxide OH stretch in both HMHP and HMHP-d2. Predictions using the Rice–Ramsperger–Kassel–Marcus theory give rates that are in reasonably good agreement with the measured dissociation rate for the alcohol OH stretch but considerably differ from the measured rates for the peroxide OH stretch in both isotopomers. The present results are interpreted as suggesting that the extent of intramolecular vibrational energy redistribution (IVR) is different for the two OH stretching states associated with the two functional groups in HMHP, with IVR being substantially less complete for the peroxide OH stretch. Analysis of the OH fragment product state distributions in conjunction with phase-space theory simulation gives a D0 value of 38±0.7 kcal/mole for breaking the peroxide bond in HMHP
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