Hybrid Method for Digits Recognition using Fixed-Frame Scores and Derived Pitch

This paper presents a procedure of frame normalization based on the traditional dynamic time warping (DTW) using the LPC coefficients. The redefined method is called as the DTW frame-fixing method (DTW-FF), it works by normalizing the word frames of the input against the reference frames. The enthusiasm to this study is due to neural network limitation that entails a fix number of input nodes for when processing multiple inputs in parallel. Due to this problem, this research is initiated to reduce the amount of computation and complexity in a neural network by reducing the number of inputs into the network. In this study, dynamic warping process is used, in which local distance scores of the warping path are fixed and collected so that their scores are of equal number of frames. Also studied in this paper is the consideration of pitch as a contributing feature to the speech recognition. Results showed a good performance and improvement when using pitch along with DTW-FF feature. The convergence rate between using the steepest gradient descent is also compared to another method namely conjugate gradient method. Convergence rate is also improved when conjugate gradient method is introduced in the back-propagation algorithm

Global distribution and interannual variations of mesospheric and lower thermospheric neutral wind diurnal tide: 2. Nonmigrating tide

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/94716/1/jgra18976.pd

Long‐term variability in the solar diurnal tide observed by HRDI and simulated by the GSWM

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/94861/1/grl8658.pd

Optimizing crop production through control of water and salinity levels in the soil

Sizable investments have been made and continue to be made throughout the world to develop irrigation potentials. Recent food shortages have heightened the concern for obtaining greater returns to irrigation through improved water management and use. A knowledge of how plant growth cycles relate to moisture and salinity levels in the root zone is prerequisite to developing practical ways of maintaining optimum conditions for maximum production per unit of water concerned. This research further defines the role of irrigation timing and salinity management on crop production, and proposes practical techniques for predicting the crop response to management measures. Some of the advantages and special features of the research program outlined by the report are listed as follows: 1. The experimental design is unique in that a sprinkler line is used as a single source of water. This approach provides large volumes of yield data as influenced by water supplies available to the crop. These data will provide information on the following: a. Accurate evaluation of the basic water requirements of crops. b. The optimal sequencing of deficits during crop growth stages. c. The establishment of yield versus evapotranspiration relationships over the entire range of wter supply from rainfall (dryland) to over-irrigation. d. An evaluation of soil water holding capacities in terms of its contributions to the water needs of the crop. This information provides guidance on how to best utilize the root system of a given crop type as a water gathering tool in terms of time during the growing season. For example, planting date, plant spacing, and fertilizer practices will be influenced by this information. 2. The experimental layout is versatile in that it lends itself to a study of the effects on plant growth of input parameters other than water, such as fertility levels and plant spacing. 3. The design can be readily adapted to accommodate several varieties and/or species in the same experiment. 4. The research results are practical and generally applicable to a wide range of crop, climate, soil, and water supply (non site specific and site specific) conditions. 5. The research provides a clear demonstration (both visual and quantitative) of the beneficial effects of proper management practices on crop production. 6. The research deals with both domestic and international water problems involving crop production, namely, the influence of available soil measure and soil salinity on plant yields. 7. The research techniques are readily adaptable to application in developing countries. a. A sprinkler system for irrigation is not necessary though desireable. b. The research procedures are simple, inexpensive, easy to perform, and yet provide much information. 8. The research involves the join efforts of several institutions and utilizes highly experienced research principal investigators who have a proven record of effectively working together as an integrated team. 9. The validity of the research approach and the viability of the results have been demonstrated by current research. The main tasks remaining are to broaden the crop base and to test and demonstrate the applicability of the results to other areas throughout the world

Artificial Neural Network-based error compensation procedure for low-cost encoders

An Artificial Neural Network-based error compensation method is proposed for improving the accuracy of resolver-based 16-bit encoders by compensating for their respective systematic error profiles. The error compensation procedure, for a particular encoder, involves obtaining its error profile by calibrating it on a precision rotary table, training the neural network by using a part of this data and then determining the corrected encoder angle by subtracting the ANN-predicted error from the measured value of the encoder angle. Since it is not guaranteed that all the resolvers will have exactly similar error profiles because of the inherent differences in their construction on a micro scale, the ANN has been trained on one error profile at a time and the corresponding weight file is then used only for compensating the systematic error of this particular encoder. The systematic nature of the error profile for each of the encoders has also been validated by repeated calibration of the encoders over a period of time and it was found that the error profiles of a particular encoder recorded at different epochs show near reproducible behavior. The ANN-based error compensation procedure has been implemented for 4 encoders by training the ANN with their respective error profiles and the results indicate that the accuracy of encoders can be improved by nearly an order of magnitude from quoted values of ~6 arc-min to ~0.65 arc-min when their corresponding ANN-generated weight files are used for determining the corrected encoder angle.Comment: 16 pages, 4 figures. Accepted for Publication in Measurement Science and Technology (MST

Global distribution and interannual variations of mesospheric and lower thermospheric neutral wind diurnal tide: 1. Migrating tide

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/95689/1/jgra18975.pd

Energy and spectral enhancement of femtosecond supercontinuum in a noble gas using a weak seed

We experimentally demonstrate that the use of a weak seed pulse of energy less than 0.4% of the pump results in a spectral energy enhancement that spans over 2 octaves and a total energy enhancement of more than 3 times for supercontinua generated by millijoule level femtosecond pulses in Krypton gas. Strong four-wave mixing of the pump-seed pulse interacting in the gas is observed. The spectral irradiance generated from the seeding process is sufficiently high to use white-light continuum as an alternative to conventional tunable sources of radiation for applications such as nonlinear optical spectroscopy