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138 results on '"Choi, Woongchul"'

3. Rapid Estimation of Static Capacity Based on Machine Learning: A Time-Efficient Approach.

Author

Son, Younggill and Choi, Woongchul

Subjects
ELECTRIC automobiles, GREENHOUSE gas mitigation, MACHINE learning, STANDARD deviations, PARTIAL discharges, ELECTRIC vehicle batteries, LITHIUM-ion batteries
Abstract

With the global surge in electric vehicle (EV) deployment, driven by enhanced environmental regulations and efforts to reduce transportation-related greenhouse gas emissions, managing the life cycle of Li-ion batteries becomes more critical than ever. A crucial step for battery reuse or recycling is the precise estimation of static capacity at retirement. Traditional methods are time-consuming, often taking several hours. To address this issue, a machine learning-based approach is introduced to estimate the static capacity of retired batteries rapidly and accurately. Partial discharge data at a 1 C rate over durations of 6, 3, and 1 min were analyzed using a machine learning algorithm that effectively handles temporally evolving data. The estimation performance of the methodology was evaluated using the mean absolute error (MAE), mean squared error (MSE), and root mean squared error (RMSE). The results showed reliable and fairly accurate estimation performance, even with data from shorter partial discharge durations. For the one-minute discharge data, the maximum RMSE was 2.525%, the minimum was 1.239%, and the average error was 1.661%. These findings indicate the successful implementation of rapidly assessing the static capacity of EV batteries with minimal error, potentially revitalizing the retired battery recycling industry. [ABSTRACT FROM AUTHOR]

Published
2024
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11. Placement of Charging Infrastructures for EVs using K-Mean Algorithm and its Validation using Real Usage Data

Author

Choi, Woongchul

Abstract

Global climate change is affecting human life more seriously than ever before. Countries around the world have identified cars as a significant source of pollution, leading to an increased interest in eco-friendly automobiles. Electric vehicles (EVs), which are characteristically eco-friendly, have become a choice for future transportation system. In this paper, we proposed a strategy for determining the appropriate placement of large-scale charging stations using K-mean algorithm. Also, the initial results were validated utilizing actual electricity usage data from the existing chargers. Currently in Korea, a typical public charging station has two to three chargers to support EV users. As EVs become more popular, new problems arise, such as charger hopping and/or long waiting lines. In order to address these new issues, a large-scale charging station concept which houses more than ten chargers, is suggested. In doing so, a strategic approach for selecting close-to-ideal locations for the charging stations is introduced to maximize the charging station’s effectiveness. In this study, Jeju Island, Korea, which has many EVs, was used as a testbed. With the wealth of EV chargers and their usage data, initial validation of the proposed methodology was made possible. During the evaluation of the best possible locations for the largescale charging stations, we considered the locations of tourist attractions and convenient support facilities, as well as the population. After the evaluations, the proposed locations were validated using actual long-term charger usage data on Jeju Island. The demonstrated strategy for identifying appropriate locations for large-scale charging stations can be used by other tourist heavy islands or even small countries.

Published
2024
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16. Multi-channel Enhancements for IEEE 802.11-Based Multi-hop Ad-Hoc Wireless Networks

Author

Lee, YongSuk, Choi, WoongChul, Kang, SukJoong, Cho, SeongJe, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Denko, Mieso K., editor, Shih, Chi-sheng, editor, Li, Kuan-Ching, editor, Tsao, Shiao-Li, editor, Zeng, Qing-An, editor, Park, Soo Hyun, editor, Ko, Young-Bae, editor, Hung, Shih-Hao, editor, and Park, Jong Hyuk, editor

Published
2007
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17. Energy Efficient PNC Selection Procedure for the IEEE 802.15.3-Based HR-WPAN

Author

Choi, EunChang, Huh, JaeDoo, Kim, Soo-Joong, Choi, WoongChul, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Zhou, Xiaobo, editor, Sokolsky, Oleg, editor, Yan, Lu, editor, Jung, Eun-Sun, editor, Shao, Zili, editor, Mu, Yi, editor, Lee, Dong Chun, editor, Kim, Dae Young, editor, Jeong, Young-Sik, editor, and Xu, Cheng-Zhong, editor

Published
2006
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18. BEST: Buffer-Driven Efficient Streaming Protocol

Author

Lee, Sunhun, Lee, Jungmin, Chung, Kwangsue, Choi, WoongChul, Rhee, Seung Hyong, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Gervasi, Osvaldo, editor, Gavrilova, Marina L., editor, Kumar, Vipin, editor, Laganá, Antonio, editor, Lee, Heow Pueh, editor, Mun, Youngsong, editor, Taniar, David, editor, and Tan, Chih Jeng Kenneth, editor

Published
2005
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19. Design of Anonymity-Preserving User Authentication and Key Agreement Protocol for Ubiquitous Computing Environments

Author

Kang, Myung-hee, Ryou, Hwang-bin, Choi, WoongChul, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Deng, Xiaotie, editor, and Ye, Yinyu, editor

Published
2005
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20. Full-Duplex Transmission on the Unidirectional Links of High-Rate Wireless PANs

Author

Rhee, Seung Hyong, Lee, Wangjong, Choi, WoongChul, Chung, Kwangsue, Lee, Jang-Yeon, Cho, Jin-Woong, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Jia, Xiaohua, editor, Wu, Jie, editor, and He, Yanxiang, editor

Published
2005
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21. An EJB-Based Platform for Policy-Based QoS Management of DiffServ Enabled Next Generation Networks

Author

Cha, Si-Ho, Choi, WoongChul, Cho, Kuk-Hyun, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Lorenz, Pascal, editor, and Dini, Petre, editor

Published
2005
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22. WFCTA(Weighted Fair Channel Time Allocation) and Its Analysis for HR-WPAN

Author

Choi, WoongChul, Chung, KwangSue, Rhee, Seung Hyong, Cho, Jin-Woong, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Ramos, Félix F., editor, Larios Rosillo, Victor, editor, and Unger, Herwig, editor

Published
2005
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23. On Performance Improvement for 802.11-based Multi-hop Ad Hoc Wireless Networks

Author

Choi, WoongChul, Lee, YongSuk, Park, Byung Joon, Cho, Kuk-Hyun, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Ramos, Félix F., editor, Larios Rosillo, Victor, editor, and Unger, Herwig, editor

Published
2005
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24. BCTMA (Bi-directional Cut-Through Medium Access) Protocol for 802.11-Based Multi-hop Wireless Networks

Author

Choi, WoongChul, Han, JinWoo, Park, Byung Joon, Hong, JiMan, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Ramos, Félix F., editor, Larios Rosillo, Victor, editor, and Unger, Herwig, editor

Published
2005
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25. SoIDPS: Sensor Objects-Based Intrusion Detection and Prevention System and Its Implementation

Author

Cho, SeongJe, Chang, Hye-Young, Kim, HongGeun, Choi, WoongChul, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Carbonell, Jaime G., editor, Siekmann, Jörg, editor, Hao, Yue, editor, Liu, Jiming, editor, Wang, Yu-Ping, editor, Cheung, Yiu-ming, editor, Yin, Hujun, editor, Jiao, Licheng, editor, Ma, Jianfeng, editor, and Jiao, Yong-Chang, editor

Published
2005
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26. Policy-Based Differentiated QoS Provisioning for DiffServ Enabled IP Networks

Author

Cha, Si-Ho, Lee, Jong-Eon, Choi, WoongChul, Lee, Jae-Oh, Cho, Kuk-Hyun, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Kahng, Hyun-Kook, editor, and Goto, Shigeki, editor

Published
2004
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