Kevin Nowka

Kevin Nowka


Research Focus & Metrics

Academic Career Length

4Years (2023-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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25 May 2024 in Remote Sensing
Verified
Journal Article
Open access
PDF file
SDSambandh Bhusan Dhal
Sambandh Bhusan Dhal
Stavros KalafatisStavros Kalafatis
Stavros Kalafatis
UBUlisses M. Braga-Neto
Ulisses M. Braga-Neto
KGKrishna Chaitanya Gadepally
Krishna Chaitanya Gadepally
Jose Luis Landivar ScottJose Luis Landivar Scott
Jose Luis Landivar Scott
MBMahendra Bhandari
Mahendra Bhandari
Cotton (Gossypium spp.), a crucial cash crop in the United States, requires the constant monitoring of growth parameters for informed decision-making. Recently, forecasting models have gained prominence for predicting canopy indicators, aiding in-season planning and management decisions to optimize cotton production. This study employed unmanned aerial system (UAS) technology to collect canopy cover (CC) data from a 40-hectare cotton field in Driscoll, Texas, in 2020 and 2021. Long short-term memory (LSTM) models, trained using 2020 data, were subsequently applied to forecast the CC values for 2021. These models were compared with real-time auto-regressive integrated moving average (ARIMA) models to assess their effectiveness in predicting the CC values up to 14 days in advance, starting from the 28th day after crop emergence. The results showed that multiple-input multi-step output LSTM models achieved higher accuracy in predicting the in-season CC values during the early growth stages (up to the 56th day), with an average testing RMSE of 3.86, significantly lower than other single-input LSTM models. Conversely, when sufficient testing data are available, single-input stacked-LSTM models demonstrated precision in CC predictions for later stages, achieving an average RMSE of 3.06. These findings highlight the potential of LSTM models for in-season CC forecasting, facilitating effective management strategies in cotton production.

25 April 2023 in Preprints.org
Verified
Preprint
Open access
PDF file
KGKrishna Chaitanya Gadepally
Krishna Chaitanya Gadepally
SDSambandh Bhusan Dhal
Sambandh Bhusan Dhal
Stavros KalafatisStavros Kalafatis
Stavros Kalafatis
KNKevin Nowka
Kevin Nowka
In today’s digital economy data-based decisions have become very important to meet the ev-er-growing needs of customer engagement, retention, and satisfaction. Clickstream data is one such data that is being used to better understand, predict and engage with customers. Unfortu-nately, clickstream data for understanding customers has raised privacy and security concerns with many internet providers selling data for monetary benefits. This paper showcases a meth-odology that is developed based on experiential learning and using the latest cryptographic methods including differential privacy and graph analytics for predicting customer lifetime value (CLV) using clickstream data. Results obtained show that a user’s engagement can be pre-dicted within a relatively acceptable range after preserving privacy.

7 June 2023 in Preprints.org
Verified
Preprint
Open access
PDF file
KGKrishna Chaitanya Gadepally
Krishna Chaitanya Gadepally
SDSambandh Bhusan Dhal
Sambandh Bhusan Dhal
Stavros KalafatisStavros Kalafatis
Stavros Kalafatis
KNKevin Nowka
Kevin Nowka
Neural networks were treated as black boxes for a long time. Previous works have unearthed what aspects of an image were important for convolutional layers at different positions in the network. This was done using deconvolutional networks. In this paper, we examine how well a convolutional neural network performs when those convolutional layers which are relatively unimportant for a particular image (i.e., the image does not produce one of the strongest activations) are skipped in the training, validating, and testing process.