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Paper Abstract and Keywords
Presentation 2026-07-24 10:35
A Runtime DCS-Based Mechanism for Progressive ODD Degradation -- An Implementation on Lingua Franca with an ADAS Case Study --
Yusei Ishimizu, Toshihide Ubukata (Science Tokyo), Jialong Li (Waseda Univ.), Kenji Tei (Science Tokyo) SS2026-28 KBSE2026-28
Abstract (in Japanese) (See Japanese page) 
(in English) Advanced Driver Assistance Systems (ADAS) cannot always maintain full functionality under degraded environmental and computational conditions. In such situations, stop-only behavior or fixed mode switching is often overly conservative, and a runtime mechanism is needed to determine how much functionality can still be preserved safely. This paper presents a runtime degradation mechanism on Lingua Franca (LF) that connects monitoring, decision making, and control application, generates local FSP models from the current abstract state, invokes Directed Controller Synthesis, and selects the highest feasible degraded ODD level. The mechanism observes latency level, lane visibility, lead gap, and driver available, evaluates ODD levels from L0 to L3, and reflects the result into control constraints such as speed capping, lane-change permission, handover request, hazard lights, and stopping. Through an ADAS prototype, we show an executable skeleton of progressive runtime degradation based on local DCS rather than hand-written fixed mode switches.
Keyword (in Japanese) (See Japanese page) 
(in English) Lingua Franca / Directed Controller Synthesis / ADAS / Runtime Degradation / ODD / Runtime Assurance / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 126, KBSE2026-28, pp. 163-168, July 2026.
Paper # KBSE2026-28 
Date of Issue 2026-07-15 (SS, KBSE) 
ISSN Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF SS2026-28 KBSE2026-28

Conference Information
Committee SS KBSE IPSJ-SE  
Conference Date 2026-07-22 - 2026-07-24 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To KBSE 
Conference Code 2026-07-SS-KBSE-SE 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Runtime DCS-Based Mechanism for Progressive ODD Degradation 
Sub Title (in English) An Implementation on Lingua Franca with an ADAS Case Study 
Keyword(1) Lingua Franca  
Keyword(2) Directed Controller Synthesis  
Keyword(3) ADAS  
Keyword(4) Runtime Degradation  
Keyword(5) ODD  
Keyword(6) Runtime Assurance  
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1st Author's Name Yusei Ishimizu  
1st Author's Affiliation Institute of Science Tokyo (Science Tokyo)
2nd Author's Name Toshihide Ubukata  
2nd Author's Affiliation Institute of Science Tokyo (Science Tokyo)
3rd Author's Name Jialong Li  
3rd Author's Affiliation Waseda University (Waseda Univ.)
4th Author's Name Kenji Tei  
4th Author's Affiliation Institute of Science Tokyo (Science Tokyo)
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Speaker Author-1 
Date Time 2026-07-24 10:35:00 
Presentation Time 20 minutes 
Registration for KBSE 
Paper # SS2026-28, KBSE2026-28 
Volume (vol) vol.126 
Number (no) no.125(SS), no.126(KBSE) 
Page pp.163-168 
#Pages 6 
Date of Issue 2026-07-15 (SS, KBSE) 

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