{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:Q44E5CE2WKHQHCOTVOWDYNJBIL","short_pith_number":"pith:Q44E5CE2","canonical_record":{"source":{"id":"1509.08709","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"cs.DM","submitted_at":"2015-09-29T12:12:24Z","cross_cats_sorted":[],"title_canon_sha256":"85df7f8576ebd751c79a0c40ec23eb9814f39684bbc49f67cbd1564c7cd1c9b9","abstract_canon_sha256":"68df2ef01568d404d5ec81112e359167d205cfa0603989fc67fab4f575020d0e"},"schema_version":"1.0"},"canonical_sha256":"87384e889ab28f0389d3abac3c352142c433277cb813d363fc9c3af2bda9ce19","source":{"kind":"arxiv","id":"1509.08709","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1509.08709","created_at":"2026-05-18T01:31:47Z"},{"alias_kind":"arxiv_version","alias_value":"1509.08709v1","created_at":"2026-05-18T01:31:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1509.08709","created_at":"2026-05-18T01:31:47Z"},{"alias_kind":"pith_short_12","alias_value":"Q44E5CE2WKHQ","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_16","alias_value":"Q44E5CE2WKHQHCOT","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_8","alias_value":"Q44E5CE2","created_at":"2026-05-18T12:29:37Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:Q44E5CE2WKHQHCOTVOWDYNJBIL","target":"record","payload":{"canonical_record":{"source":{"id":"1509.08709","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"cs.DM","submitted_at":"2015-09-29T12:12:24Z","cross_cats_sorted":[],"title_canon_sha256":"85df7f8576ebd751c79a0c40ec23eb9814f39684bbc49f67cbd1564c7cd1c9b9","abstract_canon_sha256":"68df2ef01568d404d5ec81112e359167d205cfa0603989fc67fab4f575020d0e"},"schema_version":"1.0"},"canonical_sha256":"87384e889ab28f0389d3abac3c352142c433277cb813d363fc9c3af2bda9ce19","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:31:47.291965Z","signature_b64":"UYahf/Bqx7vu0qvRoBwtfaJLrE7HwTrDr4oBc2JXdO5Rd5QlK8IQT6WMzdb5vL8ZSLWFw0OCywDOQqB8NlDIAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"87384e889ab28f0389d3abac3c352142c433277cb813d363fc9c3af2bda9ce19","last_reissued_at":"2026-05-18T01:31:47.291557Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:31:47.291557Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1509.08709","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:31:47Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OATT4+uLPmUegIRx+nFKOrpWVmDSAmmwZZZg8MFP/pV4Q8VMkFoRs1I+ae3g5WwAmpJ5JWYZ6HQZnPos5dk6Cg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-22T01:21:31.463345Z"},"content_sha256":"9d96f55a3db7e3a7181e1e8d19c9ad53e80cfa22c13b67707df232f5336d3cfb","schema_version":"1.0","event_id":"sha256:9d96f55a3db7e3a7181e1e8d19c9ad53e80cfa22c13b67707df232f5336d3cfb"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:Q44E5CE2WKHQHCOTVOWDYNJBIL","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Traffic signal optimization: combining static and dynamic models","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","headline":"","cross_cats":[],"primary_cat":"cs.DM","authors_text":"Ekkehard K\\\"ohler, Martin Strehler","submitted_at":"2015-09-29T12:12:24Z","abstract_excerpt":"In this paper, we present a cyclically time-expanded network model for simultaneous optimization of traffic assignment and traffic signal parameters, in particular offsets, split times, and phase orders. Since travel times are of great importance for developing realistic solutions for traffic assignment and traffic signal coordination in urban road networks, we perform an extensive analysis of the model. We show that a linear time-expanded model can reproduce realistic travel times especially for use with traffic signals and we verify this by simulation. Furthermore, we show how exact mathemat"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1509.08709","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:31:47Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QKZW5vDx5XuBpKuBEVl83vyZFYinu960mSDiKTVE4vszBWyRh3EUYni/D9uwEALgZq/orBc1Y8i6wWg+vRpEDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-22T01:21:31.463728Z"},"content_sha256":"adbe1ce755f843fbb17bbaa219bed25d618de2dad7ea40a7f5bdcd4fbf9e0ed7","schema_version":"1.0","event_id":"sha256:adbe1ce755f843fbb17bbaa219bed25d618de2dad7ea40a7f5bdcd4fbf9e0ed7"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/Q44E5CE2WKHQHCOTVOWDYNJBIL/bundle.json","state_url":"https://pith.science/pith/Q44E5CE2WKHQHCOTVOWDYNJBIL/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/Q44E5CE2WKHQHCOTVOWDYNJBIL/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-22T01:21:31Z","links":{"resolver":"https://pith.science/pith/Q44E5CE2WKHQHCOTVOWDYNJBIL","bundle":"https://pith.science/pith/Q44E5CE2WKHQHCOTVOWDYNJBIL/bundle.json","state":"https://pith.science/pith/Q44E5CE2WKHQHCOTVOWDYNJBIL/state.json","well_known_bundle":"https://pith.science/.well-known/pith/Q44E5CE2WKHQHCOTVOWDYNJBIL/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:Q44E5CE2WKHQHCOTVOWDYNJBIL","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"68df2ef01568d404d5ec81112e359167d205cfa0603989fc67fab4f575020d0e","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"cs.DM","submitted_at":"2015-09-29T12:12:24Z","title_canon_sha256":"85df7f8576ebd751c79a0c40ec23eb9814f39684bbc49f67cbd1564c7cd1c9b9"},"schema_version":"1.0","source":{"id":"1509.08709","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1509.08709","created_at":"2026-05-18T01:31:47Z"},{"alias_kind":"arxiv_version","alias_value":"1509.08709v1","created_at":"2026-05-18T01:31:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1509.08709","created_at":"2026-05-18T01:31:47Z"},{"alias_kind":"pith_short_12","alias_value":"Q44E5CE2WKHQ","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_16","alias_value":"Q44E5CE2WKHQHCOT","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_8","alias_value":"Q44E5CE2","created_at":"2026-05-18T12:29:37Z"}],"graph_snapshots":[{"event_id":"sha256:adbe1ce755f843fbb17bbaa219bed25d618de2dad7ea40a7f5bdcd4fbf9e0ed7","target":"graph","created_at":"2026-05-18T01:31:47Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"In this paper, we present a cyclically time-expanded network model for simultaneous optimization of traffic assignment and traffic signal parameters, in particular offsets, split times, and phase orders. Since travel times are of great importance for developing realistic solutions for traffic assignment and traffic signal coordination in urban road networks, we perform an extensive analysis of the model. We show that a linear time-expanded model can reproduce realistic travel times especially for use with traffic signals and we verify this by simulation. Furthermore, we show how exact mathemat","authors_text":"Ekkehard K\\\"ohler, Martin Strehler","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"cs.DM","submitted_at":"2015-09-29T12:12:24Z","title":"Traffic signal optimization: combining static and dynamic models"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1509.08709","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:9d96f55a3db7e3a7181e1e8d19c9ad53e80cfa22c13b67707df232f5336d3cfb","target":"record","created_at":"2026-05-18T01:31:47Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"68df2ef01568d404d5ec81112e359167d205cfa0603989fc67fab4f575020d0e","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"cs.DM","submitted_at":"2015-09-29T12:12:24Z","title_canon_sha256":"85df7f8576ebd751c79a0c40ec23eb9814f39684bbc49f67cbd1564c7cd1c9b9"},"schema_version":"1.0","source":{"id":"1509.08709","kind":"arxiv","version":1}},"canonical_sha256":"87384e889ab28f0389d3abac3c352142c433277cb813d363fc9c3af2bda9ce19","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"87384e889ab28f0389d3abac3c352142c433277cb813d363fc9c3af2bda9ce19","first_computed_at":"2026-05-18T01:31:47.291557Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:31:47.291557Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"UYahf/Bqx7vu0qvRoBwtfaJLrE7HwTrDr4oBc2JXdO5Rd5QlK8IQT6WMzdb5vL8ZSLWFw0OCywDOQqB8NlDIAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:31:47.291965Z","signed_message":"canonical_sha256_bytes"},"source_id":"1509.08709","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9d96f55a3db7e3a7181e1e8d19c9ad53e80cfa22c13b67707df232f5336d3cfb","sha256:adbe1ce755f843fbb17bbaa219bed25d618de2dad7ea40a7f5bdcd4fbf9e0ed7"],"state_sha256":"9f127ae35f65ad42690ef695cf8c6a21b49a1c6c6ad299021453055d47c7faa5"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Wsss2jt1CymQFzpo5eT5RkWlYknp1kDMSQF1oWA2gpp7F6J2cGn4WOahrwHUd4joE2YsOYzMdIn3OMvkzpb9AA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-22T01:21:31.465686Z","bundle_sha256":"f63fffcbe32006cf340fa7e206e499ea95f5b47d8252cedaef017f4d37b30288"}}