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β€Ž_includes/memberLink.htmlβ€Ž

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{% assign memberUrl = "jjKim" %}
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{% elsif memberName contains "Changeun Park" %}
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{% assign memberUrl = "cePark" %}
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{% elsif memberName contains "Ahmad Mouri Zadeh Khaki" %}
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{% assign memberUrl = "aMouri" %}
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<!-- ADD MORE HERE -->
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---
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type: "Conference Paper" # Conference Paper, Journal Paper, Ph.D. Thesis, Master's Thesis
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layout: publication # Do not change this
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group: publications # Do not change this
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title: "LLM-PPO Driver: Improving Autonomous Driving via LLM-Guided Reward Shaping and Imitation Learning" # Title of the paper
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# krtitle: # only for domestic papers
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authors:
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- name: "Ahmad Mouri Zadeh Khaki"
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- name: "Kyunghwan Choi"
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corresponding: true # true if this author is the corresponding author
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domestic_or_international: "International" # "International" or "Domestic"
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# preprint: # Preprint information - REMOVE THIS FIELD IF NOT APPLICABLE!
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# - name: Techrxiv
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# doi: "10.36227/techrxiv.173014412.26480551/v1"
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# year: 2024
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# pdf: "/static/pub/2025-all-wheel.pdf"
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# state: "published" # published, accepted, submitted
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pub: # Publication information - REMOVE THIS FIELD IF NOT APPLICABLE!
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- name: "Asian Control Conference (ASCC)"
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pdf: "/static/pub/2026-LLM-PPO.pdf"
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doi: # Leave it blank if not applicable
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vol: # Leave it blank if not applicable
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num: # Leave it blank if not applicable
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pp: # "380-385" # Leave it blank if not applicable
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year: "2026" # Leave it blank if not applicable
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state: "submitted" # published, accepted, submitted
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bib: # "/static/pub/2025-imposing.bib" # Leave it blank if not applicable
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pub_date: "2026-02-16" # Date of publication. Change Techrxiv (or other preprint) date to Journal date once published.
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image: "/static/pub/2026-LLM-PPO.png" # Representative image of the paper
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abstract: "
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Proximal Policy Optimization (PPO) has shown promise for autonomous driving; however, it suffers from sparse rewards, slow convergence, and unsafe behaviors due to exploration without prior knowledge. These limitations are particularly critical in safety-sensitive driving scenarios, where failure events are rare but severe. To address this issue, we propose LLM-PPO Driver, a framework that enhances PPO-based motion planning by incorporating high-level semantic driving knowledge from a Large Language Model (LLM). The LLM does not participate in real-time decision-making; instead, it provides structured prior knowledge that is integrated through reward shaping and imitation learning. This lightweight and modular design eliminates deployment-time inference overhead while guiding policy learning toward safer and more efficient behaviors. Experiments in the Gym highway-v0 environment demonstrate consistent improvements in task success and safety over a baseline PPO agent, with imitation learning yielding the largest performance gain. These results highlight the effectiveness of leveraging LLM-based prior knowledge to mitigate unsafe exploration and improve learning efficiency in autonomous driving.
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"
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# additional: # additional information such as awards, etc.
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# - "πŸ“„ Awarded **Best Paper Award** at the _2025 European Control Conference (ECC)_."
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# links: # additional links;
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# - name:
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# url:
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---
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---
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type: "Conference Paper" # Conference Paper, Journal Paper, Ph.D. Thesis, Master's Thesis
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layout: publication # Do not change this
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group: publications # Do not change this
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title: "Traffic Network-Aware Energy Management for FCEVs: Integrating Trip-Specific Control and Long-Run Optimality" # Title of the paper
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# krtitle: # only for domestic papers
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authors:
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- name: "Kyunghwan Choi"
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corresponding: true # true if this author is the corresponding author
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domestic_or_international: "International" # "International" or "Domestic"
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# preprint: # Preprint information - REMOVE THIS FIELD IF NOT APPLICABLE!
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# - name: Techrxiv
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# doi: "10.36227/techrxiv.173014412.26480551/v1"
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# year: 2024
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# pdf: "/static/pub/2025-all-wheel.pdf"
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# state: "published" # published, accepted, submitted
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pub: # Publication information - REMOVE THIS FIELD IF NOT APPLICABLE!
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- name: "Asian Control Conference (ASCC)"
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pdf: "/static/pub/2026-traffic-network.pdf"
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doi: # Leave it blank if not applicable
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vol: # Leave it blank if not applicable
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num: # Leave it blank if not applicable
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pp: # "380-385" # Leave it blank if not applicable
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year: "2026" # Leave it blank if not applicable
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state: "submitted" # published, accepted, submitted
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bib: # "/static/pub/2025-imposing.bib" # Leave it blank if not applicable
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pub_date: "2026-02-16" # Date of publication. Change Techrxiv (or other preprint) date to Journal date once published.
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image: "/static/pub/2026-traffic-network.png" # Representative image of the paper
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abstract: "
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Energy management for fuel cell electric vehicles (FCEVs) is a challenging trajectory optimization problem. Conventional studies primarily focus on trip-specific optimal control, where the power distribution is optimized based on a predicted finite-horizon driving profile. However, these methods often suffer from a limited look-ahead horizon and fail to guarantee long-run optimality within the stochastic traffic network where the vehicle operates. This study proposes a novel framework that integrates finite-horizon optimal control with traffic network-aware long-run average costs. We formulate the problem by embedding the long-run optimality, derived from network-level transition probabilities, into the terminal cost of the trip-specific optimization. This approach enables an adaptive target State of Charge (SOC) that aligns with global network efficiency while satisfying immediate driving constraints. Simulation results in a virtual traffic network demonstrate that the proposed integrated strategy consistently outperforms traditional trip-specific methods, achieving a maximum performance improvement of 11%. These findings highlight the necessity of network-level statistical awareness for maximizing the long-term energy efficiency of electrified mobility.
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"
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# additional: # additional information such as awards, etc.
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# - "πŸ“„ Awarded **Best Paper Award** at the _2025 European Control Conference (ECC)_."
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# links: # additional links;
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# - name:
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# url:
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---

β€Žstatic/pub/2026-LLM-PPO.pdfβ€Ž

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β€Žstatic/pub/2026-LLM-PPO.pngβ€Ž

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