Nima Nejatti, PhD, MBA

San Francisco, California, United States Contact Info
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Growth-minded AI leader with hands-on experience in Natural Language Processing, Large…

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  • NVIDIA

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Publications

  • Service considerations for an AeroMACS network reference model: Delivering next generation communications to the airport surface

    IEEE

    Demonstrate that AeroMACS delivers the full context of aviation services for the anticipated applications for the expected lifetime of the airports' infrastructure.

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  • Blind box-counting based detection of low observable targets within sea clutter

    IEICE Transactions on Communications

    Accurate modeling of sea clutter and detection of low observable targets within sea clutter are the major goals of radar signal processing applications. Recently, fractal geometry has been applied to the analysis of high range resolution radar sea clutters. The box-counting method is widely used to estimate fractal dimension but it has some drawbacks. We explain the drawbacks and propose a new fractal dimension based detector to increase detection performance in comparison with traditional…

    Accurate modeling of sea clutter and detection of low observable targets within sea clutter are the major goals of radar signal processing applications. Recently, fractal geometry has been applied to the analysis of high range resolution radar sea clutters. The box-counting method is widely used to estimate fractal dimension but it has some drawbacks. We explain the drawbacks and propose a new fractal dimension based detector to increase detection performance in comparison with traditional detectors. Both statistically generated and real data samples are used to compare detector performance.

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  • Fractal-multiresolution based detection of targets within sea clutter

    IET Electronics Letters

    A wavelet transform focuses on localised signal structures with a zooming procedure that progressively reduces the scale parameter. On the other hand, fractal geometry has recently been applied to the analysis of high range resolution radar sea clutters. Using both concepts in designing a new detector, reveals considerable improvement in performance of target detection within sea clutter. In support of this argument, simulation results using real radar data samples are presented.

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  • Power Consumption Evaluation of Sleep Mode in the IEEE 802.16 e MAC with Multi Service Connections

    IEEE

    In the sleep mode, a mobile subscribe station (MSS) sleeps for a sleep interval and wakes up at the end of this interval in order to check buffered packet(s) at base station (BS) destined to it. If there is no packet, the MSS increases the sleep window up to the maximum value or keeps it unchanged and sleeps again. In this paper, we study the effect of presence of multi service connections with different power saving classes (PSCs) on power consumption for IEEE 802.16e nodes while operating in…

    In the sleep mode, a mobile subscribe station (MSS) sleeps for a sleep interval and wakes up at the end of this interval in order to check buffered packet(s) at base station (BS) destined to it. If there is no packet, the MSS increases the sleep window up to the maximum value or keeps it unchanged and sleeps again. In this paper, we study the effect of presence of multi service connections with different power saving classes (PSCs) on power consumption for IEEE 802.16e nodes while operating in the sleep mode. Using multi service connections may result in overlapping of availability and unavailability intervals and reducing the effectiveness of power saving mode of the subscriber.

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  • Evaluating the effect of non-Poisson traffic patterns on power consumption of sleep mode in the IEEE 802.16 e MAC

    IEEE

    In this paper, we study the effect of non-Poisson traffic patterns on energy consumption for IEEE 802.16e nodes while operating in the sleep mode. In the sleep mode, a mobile subscribe station (MSS) sleeps for a sleep interval and wakes up at the end of this interval in order to check buffered packet(s) at base station (BS) destined to it. If there is no packet, the MSS increases the sleep window up to the maximum value and sleeps again. For a more general traffic pattern (rather than Poisson),…

    In this paper, we study the effect of non-Poisson traffic patterns on energy consumption for IEEE 802.16e nodes while operating in the sleep mode. In the sleep mode, a mobile subscribe station (MSS) sleeps for a sleep interval and wakes up at the end of this interval in order to check buffered packet(s) at base station (BS) destined to it. If there is no packet, the MSS increases the sleep window up to the maximum value and sleeps again. For a more general traffic pattern (rather than Poisson), we evaluate the average power consumption. Based on our analysis, we conclude that traffic pattern plays an important role in power consumption.

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  • Effect of different traffic patterns on power consumption of sleep mode in the IEEE 802.16 e MAC

    IEEE

    Abstract:
    In this paper, we study the effect of some traffic patterns on energy consumption for IEEE 802.16e nodes while operating in the sleep mode. In the sleep mode, a mobile subscribe station (MSS) sleeps for a sleep interval and wakes up at the end of this interval in order to check buffered packet(s) at base station (BS) destined to it. If there is no packet, the MSS increases the sleep window up to the maximum value and sleeps again. For a more general traffic pattern, we evaluate the…

    Abstract:
    In this paper, we study the effect of some traffic patterns on energy consumption for IEEE 802.16e nodes while operating in the sleep mode. In the sleep mode, a mobile subscribe station (MSS) sleeps for a sleep interval and wakes up at the end of this interval in order to check buffered packet(s) at base station (BS) destined to it. If there is no packet, the MSS increases the sleep window up to the maximum value and sleeps again. For a more general traffic pattern, we evaluate the average power consumption. Based on our analysis, we conclude that traffic pattern plays an important role in power consumption.

    See publication

Projects

  • WikiQA Question Answering

    -

    Using WikiQA dataset, built and trained various supervised learning models in Python to select right answers (from a set of answer sentences captured from Wikipedia) to the questions. Dealt with imbalanced issue and ultimately trained the model on a V100 GPU. Achieved MAP of 83%. USE and TensorFlow (Keras API) were among the modules and frameworks that were used.

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  • TREC Question Classification

    -

    Using TREC question classification dataset, built and trained various supervised and unsupervised learning models in Python to predict topics of the questions. Achieved 93% accuracy with a DNN model. spaCy, Universal Sentence Embedding (USE), and TensorFlow were among the modules and frameworks that were used.

    See project
  • Probabilistic Modeling for Adoption Projection of An Online Game: The Binding of Isaac

    -

    Using probability modeling and a count dataset of weekly incremental adopters of the game, built a time-varying parsimonious Weibull model with covariates baked into the Hazard function and a total of 6 parameters. Having minimized the log-liklihood of the aggregate model, achieved 0.9% of out-of-sample MAPE.

  • Debt Default Prediction

    -

    Worked on a dataset with 40 features and built a non-linear multivariate regression model with 10 covariates some interaction terms in JMP to predict the expected future debt payments of the borrowers and the likelihood of default. It turned out that FICO was not the best predictor while the loan type ("Original" vs. "Renewal") was.

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