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J. Comput. Sci. Eng. Vol.
16 (2015)
546-568 |
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Speech Endpiont
Detection Using DSP Builder |
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Lihua
Zhao |
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J. Comput. Sci. Eng.
16 (2015) 546-550
—Published
January 23, 2015 |
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Abstract:
In this paper, we use DSP Builder to realize the speech
signal endpoint detection based on short-time energy
variation. In the design, we use the LUT (look-up table)
window design and FSM (finite state machine) to simplify
the hardware circuit and improve the operating speed.
Using DSP Builder to preprocess the speech signal
(pre-emphasis, framing and windowing),to calculate the
signal short-time energy of per frame, to convert the
energy to state value according to the result of speech
energy of each frame compare with the energy threshold,
then determined the endpoint of speech signal by energy
threshold and energy logic state numeric sequence. The
results of simulation show that the method can detect
the beginning point and ending point of speech signal
effectively. |
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Keywords:
Endpiont
detection; DSP Builder; Finite state machine; Energy
changing.
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Application of
Magnetic Separation in Water Pollution Control
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Qingshan Yuan, Hanqing Zhao and Lihui Zheng |
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J. Comput. Sci. Eng. 16 (2015) 551-553 — Published
January 23, 2015
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Abstract:
In recent years, magnetic separation technology in the
industrial wastewater and sewage purification, seawater
desalination, and other fields have a wide range of
development and research, and made a lot of research
results. Magnetic separation technology plays a more and
more prominent role in application due to its advantages
in waste water control and treatment. Several aspects of
this technology in water pollution control are discussed
in this paper. |
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Keywords:Magnetic
separation technology; Waste water control; Application;
Membrane separation technology.
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QSAR Model
for the LC50 of Nitrobenzenes |
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Fucheng Song, Huazhen Yang and Hongzong Si
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J. Comput. Sci. Eng. 16 (2015) 554-558 — Published
January 24, 2015
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Abstract:
In the study of toxicology, animal experiments have
given the toxicity of nitrobenzene compounds.
Similarly, in the environment of nitrobenzene has
potential harm to human body. In order to further
study the characteristics of nitrobenzene, according
to its physical and chemical properties, through the
different method to establish QSAR model to predict
the toxicity. In our study, a nonlinear quantitative
structure–activity relationship model for the
prediction of the LC50 of nitrobenzene was developed
by the gene expression programming (GEP). This GEP
model is established basis on four descriptors which
were selected from the descriptor list by heuristic
method (HM). A nonlinear, four-descriptor model
based on GEP with mean-square error 0.065 and a
correlation coefficient (R2) 0.906 for the training
set, mean-square error 0.043 and a correlation
coefficient (R2) 0.889 for the test set. The results
indicate that this QSAR model has stable predictive
capability of nitrobenzene toxicity and it provides
a new method for toxicology research. The QSAR used
in toxicology, will greatly reduce the harm of
experimental animals.
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Keywords:Gene
expression programming; LC50; Toxicology; Quantitative
structure activity relationship; Nitrobenzene.
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Time-domain
Analysis And Research on Ground Clutter Based On IIR
Elliptic Filter
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Lihua
Zhao
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J. Comput. Sci. Eng. 16 (2015) 559-565 — Published
January 24, 2015
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Abstract:
Ground clutter is part of clutter radar echo signal
which is useless, and impact accurate estimates of large
data base. According to the time-domain characteristics
of ground clutter, this paper research on IIR elliptic
filter design methods and the impact of change filter
parameters on ground clutter time-domain filter effect.
In this paper, we use MATLAB software to design the IIR
elliptic filter, and analysis the filter effect of the
weather radar signals in the time-domain. From the
simulation results we found that the 5th order elliptic
IIR with width is 2m/s and the attenuation is 50dB had
better balanced effects in the elimination of ground
clutter. |
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Keywords:Ground
clutter; Doppler weather radar; Time-domain filter; IIR
elliptic filter.
:
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Urban
Planning Thoughts and Exploration in the Smog Era
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Qingshan Yuan, Hanqing Zhao, Lihui Zheng
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J. Comput. Sci. Eng. 16 (2015) 566-568 — Published
January 25, 2015
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Abstract:
Most parts of China have witnessed severe smog weather
in recent years which affects people’s life and travel
to a great extent and has brought about great changes in
people’s life and many problems in China’s urbanization
progress. The relationship between urbanization
development and air pollution gradually triggers deep
thoughts. This paper gathered statistics and studied the
smog situation at present in China, analyzed causes and
harm of smog, and conducted relevant studies on the
relations between smog and urbanization planning. |
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Keywords:Smog;
Urban planning; Urbanization.
:
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—— from ACSS |
