PVC membrane-based portable ion analyzer for hydroponic and water monitoring. - Hak-Jin Kim; Dong-Wook Kim; Won Kyung Kim; Woo-Jae Cho; Chang Ik Kang (Comput. Electron. Agric., 2017)

On-site ion monitoring system for precision hydroponic nutrient management. - Woo-Jae Cho; Hak-Jin Kim; Dae-Hyun Jung; Dong-Wook Kim; Tae In Ahn; Jung-Eek Son (Comput. Electron. Agric., 2018)

Validation testing of an ion-specific sensing and control system for precision hydroponic macronutrient management. - Dae-Hyun Jung; Hak-Jin Kim; Woo-Jae Cho; Soo Hyun Park; Seung-Hwan Yang (Comput. Electron. Agric., 2019)

Hybrid Signal-Processing Method Based on Neural Network for Prediction of NO3, K, Ca, and Mg Ions in Hydroponic Solutions Using an Array of Ion-Selective Electrodes. - Woo-Jae Cho; Hak-Jin Kim; Dae-Hyun Jung; Hee-Jo Han; Young-Yeol Cho (Sensors, 2019)

Water Nitrate Remote Monitoring System with Self-Diagnostic Function for Ion-Selective Electrodes. - Dae-Hyun Jung; Hak-Jin Kim; Joon Yong Kim; Soo Hyun Park; Woo-Jae Cho (Sensors, 2021)

Development of nutrient management system based on ion-equivalent concentration ratio and ion monitoring to maintain ionic balance in closed hydroponic solution. - Min-Seok Gang; Hak-Jin Kim; Tae In Ahn; Woo-Jae Cho; Sang-Hyun Lee; Ju Young Lee; Ji-Eun Hwang (Comput. Electron. Agric., 2025)