7 results on '"Kabseok Ko"'
Search Results
2. Wireless, multimodal sensors for continuous measurement of pressure, temperature, and hydration of patients in wheelchair
- Author
-
Seokjoo Cho, Hyeonseok Han, Hyunwoo Park, Sung-Uk Lee, Jae-Hwan Kim, Sung Woo Jeon, Mengqiu Wang, Raudel Avila, Zhaoqian Xi, Kabseok Ko, Minsu Park, Jungyup Lee, Myungwoo Choi, Je-Sang Lee, Weon Gi Min, Byeong-Ju Lee, Soyeong Lee, Jungrak Choi, Jimin Gu, Jaeho Park, Min Seong Kim, Junseong Ahn, Osman Gul, Chankyu Han, Gihun Lee, Seunghwan Kim, Kyuyoung Kim, Jeonghyun Kim, Chang-Mo Kang, Jahyun Koo, Sung Soo Kwak, Sungbong Kim, Dong Yun Choi, Seokwoo Jeon, Hyung Jin Sung, Yong Bae Park, Minkyu Je, Young Tae Cho, Yong Suk Oh, and Inkyu Park
- Subjects
General Materials Science ,Electrical and Electronic Engineering - Abstract
Individuals who are unable to walk independently spend most of the day in a wheelchair. This population is at high risk for developing pressure injuries caused by sitting. However, early diagnosis and prevention of these injuries still remain challenging. Herein, we introduce battery-free, wireless, multimodal sensors and a movable system for continuous measurement of pressure, temperature, and hydration at skin interfaces. The device design includes a crack-activated pressure sensor with nanoscale encapsulations for enhanced sensitivity, a temperature sensor for measuring skin temperature, and a galvanic skin response sensor for measuring skin hydration levels. The movable system enables power harvesting, and data communication to multiple wireless devices mounted at skin-cushion interfaces of wheelchair users over full body coverage. Experimental evaluations and numerical simulations of the devices, together with clinical trials for wheelchair patients, demonstrate the feasibility and stability of the sensor system for preventing pressure injuries caused by sitting.
- Published
- 2023
3. Machine-Learning-Based Near-Surface Ozone Forecasting Model with Planetary Boundary Layer Information
- Author
-
Kabseok Ko, Seokheon Cho, and Ramesh R. Rao
- Subjects
ozone forecasts ,machine learning ,numerical weather prediction ,planetary boundary layer ,LSTM ,MLP ,Machine Learning ,Air Pollutants ,Ozone ,Air Pollution ,Humans ,Electrical and Electronic Engineering ,Biochemistry ,Instrumentation ,Atomic and Molecular Physics, and Optics ,Analytical Chemistry ,Environmental Monitoring ,Forecasting - Abstract
Surface ozone is one of six air pollutants designated as harmful by National Ambient Air Quality Standards because it can adversely impact human health and the environment. Thus, ozone forecasting is a critical task that can help people avoid dangerously high ozone concentrations. Conventional numerical approaches, as well as data-driven forecasting approaches, have been studied for ozone forecasting. Data-driven forecasting models, in particular, have gained momentum with the introduction of machine learning advancements. We consider planetary boundary layer (PBL) height as a new input feature for data-driven ozone forecasting models. PBL has been shown to impact ozone concentrations, making it an important factor in ozone forecasts. In this paper, we investigate the effectiveness of utilization of PBL height on the performance of surface ozone forecasts. We present both surface ozone forecasting models, based on multilayer perceptron (MLP) and bidirectional long short-term memory (LSTM) models. These two models forecast hourly ozone concentrations for an upcoming 24-h period using two types of input data, such as measurement data and PBL height. We consider the predicted values of PBL height obtained from the weather research and forecasting (WRF) model, since it is difficult to gather actual PBL measurements. We evaluate two ozone forecasting models in terms of index of agreement (IOA), mean absolute error (MAE), and root mean square error (RMSE). Results showed that the MLP-based and bidirectional LSTM-based models yielded lower MAE and RMSE when considering forecasted PBL height, but there was no significant changes in IOA when compared with models in which no forecasted PBL data were used. This result suggests that utilizing forecasted PBL height can improve the forecasting performance of data-driven prediction models for surface ozone concentrations.
- Published
- 2022
4. Author Correction: Battery-free, wireless soft sensors for continuous multi-site measurements of pressure and temperature from patients at risk for pressure injuries
- Author
-
Myungwoo Choi, Sung Bong Kim, Jahyun Koo, Hyoyoung Jeong, Seokwoo Jeon, Myeong Namkoong, Geumbee Lee, Yong Suk Oh, John A. Rogers, Hangbo Zhao, Zhaoqian Xie, Sung Soo Kwak, Abraham Vázquez-Guardado, Min Seong Kim, Mengdi Han, So Young Kim, Sung-Uk Lee, Kyeongha Kwon, Minsu Park, Hokyung Jang, Seung-Hwan Kim, Jong Uk Kim, Yeon Sik Choi, Jae Hwan Kim, Jeonghyun Kim, Jungrak Choi, Hyung Jin Sung, Wei Lu, Xu Guo, Ha Uk Chung, Dong Yun Choi, Sang Min Won, Anthony Banks, Yujin Lee, Jongwon Kim, Quansan Yang, Zhen Song, Sung Woo Jeon, Je-Sang Lee, Kyuyoung Kim, Hanjun Ryu, Jungyup Lee, Hyeonseok Han, Weon Gi Min, Jaeman Lim, Inkyu Park, Seokjoo Cho, Janice Mihyun Baek, Chang-Mo Kang, Jungil Choi, Wubin Bai, Kabseok Ko, Raudel Avila, Bong Hoon Kim, Byeong-Ju Lee, Charles R. Davies, Yongjoon Yu, and Yonggang Huang
- Subjects
Lifestyle modification ,Adult ,Male ,Battery (electricity) ,Computer science ,Science ,General Physics and Astronomy ,Biosensing Techniques ,General Biochemistry, Genetics and Molecular Biology ,Automotive engineering ,Electric Power Supplies ,Electronic devices ,Pressure ,Humans ,Wireless ,Author Correction ,Aged ,Monitoring, Physiologic ,Skin ,Aged, 80 and over ,Multidisciplinary ,business.industry ,Temperature ,Multi site ,Equipment Design ,General Chemistry ,Middle Aged ,Electrical and electronic engineering ,Mechanical engineering ,Thermography ,Female ,business ,Biomedical engineering ,Wireless Technology - Abstract
Capabilities for continuous monitoring of pressures and temperatures at critical skin interfaces can help to guide care strategies that minimize the potential for pressure injuries in hospitalized patients or in individuals confined to the bed. This paper introduces a soft, skin-mountable class of sensor system for this purpose. The design includes a pressure-responsive element based on membrane deflection and a battery-free, wireless mode of operation capable of multi-site measurements at strategic locations across the body. Such devices yield continuous, simultaneous readings of pressure and temperature in a sequential readout scheme from a pair of primary antennas mounted under the bedding and connected to a wireless reader and a multiplexer located at the bedside. Experimental evaluation of the sensor and the complete system includes benchtop measurements and numerical simulations of the key features. Clinical trials involving two hemiplegic patients and a tetraplegic patient demonstrate the feasibility, functionality and long-term stability of this technology in operating hospital settings.
- Published
- 2021
5. Battery‐Free, Wireless, Ionic Liquid Sensor Arrays to Monitor Pressure and Temperature of Patients in Bed and Wheelchair
- Author
-
Hyeonseok Han, Yong Suk Oh, Seokjoo Cho, Hyunwoo Park, Sung‐Uk Lee, Kabseok Ko, Jae‐Man Park, Jungrak Choi, Ji‐Hwan Ha, Chankyu Han, Zichen Zhao, Zhuangjian Liu, Zhaoqian Xie, Je‐Sang Lee, Weon Gi Min, Byeong‐Ju Lee, Jahyun Koo, Dong Yun Choi, Minkyu Je, Jeong‐Yun Sun, and Inkyu Park
- Subjects
Biomaterials ,General Materials Science ,General Chemistry ,Biotechnology - Abstract
Repositioning is a common guideline for the prevention of pressure injuries of bedridden or wheelchair patients. However, frequent repositioning could deteriorate the quality of patient's life and induce secondary injuries. This paper introduces a method for continuous multi-site monitoring of pressure and temperature distribution from strategically deployed sensor arrays at skin interfaces via battery-free, wireless ionic liquid pressure sensors. The wirelessly delivered power enables stable operation of the ionic liquid pressure sensor, which shows enhanced sensitivity, negligible hysteresis, high linearity and cyclic stability over relevant pressure range. The experimental investigations of the wireless devices, verified by numerical simulation of the key responses, support capabilities for real-time, continuous, long-term monitoring of the pressure and temperature distribution from multiple sensor arrays. Clinical trials on two hemiplegic patients confined on bed or wheelchair integrated with the system demonstrate the feasibility of sensor arrays for a decrease in pressure and temperature distribution under minimal repositioning.
- Published
- 2022
6. Battery-free, wireless soft sensors for continuous multi-site measurements of pressure and temperature from patients at risk for pressure injuries
- Author
-
Sung-Uk Lee, Inkyu Park, Sung Soo Kwak, Zhen Song, Kyeongha Kwon, Ha Uk Chung, Jae Hwan Kim, Mengdi Han, Yeon Sik Choi, Myeong Namkoong, Yonggang Huang, Byeong-Ju Lee, Sung Bong Kim, Yongjoon Yu, Je-Sang Lee, Jungil Choi, Xu Guo, Hangbo Zhao, Hokyung Jang, Myungwoo Choi, Hanjun Ryu, Wei Lu, Jahyun Koo, Hyoyoung Jeong, Jungyup Lee, Jungrak Choi, Bong Hoon Kim, Kyuyoung Kim, Seung-Hwan Kim, Hyung Jin Sung, Sang Min Won, John A. Rogers, Zhaoqian Xie, Jeonghyun Kim, Wubin Bai, Min Seong Kim, Raudel Avila, Charles R. Davies, So Young Kim, Seokwoo Jeon, Hyeonseok Han, Dong Yun Choi, Weon Gi Min, Jaeman Lim, Quansan Yang, Kabseok Ko, Anthony Banks, Yujin Lee, Seokjoo Cho, Chang-Mo Kang, Sung Woo Jeon, Yong Suk Oh, Minsu Park, Abraham Vázquez-Guardado, Jong Uk Kim, Jongwon Kim, Geumbee Lee, and Janice Mihyun Baek
- Subjects
Lifestyle modification ,Battery (electricity) ,Hospitalized patients ,Computer science ,Science ,General Physics and Astronomy ,Multiplexer ,Article ,General Biochemistry, Genetics and Molecular Biology ,Electronic devices ,Wireless ,Simulation ,Membrane deflection ,Sensor system ,Multidisciplinary ,business.industry ,fungi ,Continuous monitoring ,Multi site ,food and beverages ,General Chemistry ,Electrical and electronic engineering ,Mechanical engineering ,business ,Biomedical engineering - Abstract
Capabilities for continuous monitoring of pressures and temperatures at critical skin interfaces can help to guide care strategies that minimize the potential for pressure injuries in hospitalized patients or in individuals confined to the bed. This paper introduces a soft, skin-mountable class of sensor system for this purpose. The design includes a pressure-responsive element based on membrane deflection and a battery-free, wireless mode of operation capable of multi-site measurements at strategic locations across the body. Such devices yield continuous, simultaneous readings of pressure and temperature in a sequential readout scheme from a pair of primary antennas mounted under the bedding and connected to a wireless reader and a multiplexer located at the bedside. Experimental evaluation of the sensor and the complete system includes benchtop measurements and numerical simulations of the key features. Clinical trials involving two hemiplegic patients and a tetraplegic patient demonstrate the feasibility, functionality and long-term stability of this technology in operating hospital settings., Uninterrupted monitoring of pressure and temperature at skin interfaces can help to minimize the potential for pressure injuries in hospitalized or bedridden patients. Here, the authors introduce a soft, skin-mountable sensor that can continuously provide readings via antennas mounted under bedding, and demonstrate the functionality and robustness of the devices on patients.
- Published
- 2021
7. Electric Vehicle Charging in Residential Day-Ahead Real-Time Pricing
- Author
-
Kabseok Ko, Seokheon Cho, Jimyung Kang, and Ramesh R. Rao
- Subjects
Mathematical optimization ,business.product_category ,Real time pricing ,Job shop scheduling ,Computer science ,020209 energy ,Approximation algorithm ,02 engineering and technology ,Scheduling (computing) ,Nonlinear programming ,Demand response ,Electric vehicle ,0202 electrical engineering, electronic engineering, information engineering ,business - Abstract
In this paper, we consider an electric vehicle (EV) charging schedule together with appliance scheduling in a residence under a day-ahead real-time pricing scheme (DA-RTP). Among demand response (DR) programs, EVs are an important resource for reducing energy cost due to high flexibility in energy scheduling. On the other hand, the required amount of energy to charge an EV has a counter effect on cost reduction. In a scheduling problem, a constraint on state-of-charge (SoC) of an EV when departing could be a factor in increased cost. Thus, instead of the constraint, we introduce a dissatisfaction at SoC when departing in the objective of the scheduling problem. We formulate our scheduling problem for minimizing a consumer's total dissatisfaction as a mixed-integer nonlinear programming (MINLP) problem since we consider shiftable but uninterruptible loads, which need an On/Off decision. We adopt an outer approximation algorithm to efficiently obtain an optimal solution.
- Published
- 2018
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.