{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:3XJJYBFXIFE6KM63QS3YL7ICEN","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":"ec6ed4a441e07f645165fae71cb26323fc4fe89dce5d81ac8c7f3fe860e0630e","cross_cats_sorted":["cs.DS","cs.NA","math.NA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.DC","submitted_at":"2018-03-08T20:11:28Z","title_canon_sha256":"ea58f09f10aefa12f9bf7aa0e99978f50207e199e0b93816a90f57640e23bb77"},"schema_version":"1.0","source":{"id":"1803.03290","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1803.03290","created_at":"2026-05-18T00:21:40Z"},{"alias_kind":"arxiv_version","alias_value":"1803.03290v1","created_at":"2026-05-18T00:21:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1803.03290","created_at":"2026-05-18T00:21:40Z"},{"alias_kind":"pith_short_12","alias_value":"3XJJYBFXIFE6","created_at":"2026-05-18T12:32:05Z"},{"alias_kind":"pith_short_16","alias_value":"3XJJYBFXIFE6KM63","created_at":"2026-05-18T12:32:05Z"},{"alias_kind":"pith_short_8","alias_value":"3XJJYBFX","created_at":"2026-05-18T12:32:05Z"}],"graph_snapshots":[{"event_id":"sha256:0ee349b19488619569682b1c5a665077ee690bb6c5688f2eb1a1255cf9ddc072","target":"graph","created_at":"2026-05-18T00:21:40Z","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":"Contingency analysis (CA) plays a critical role to guarantee operation security in the modern power systems. With the high penetration of renewable energy, a real-time and comprehensive N-1 CA is needed as a power system analysis tool to ensure system security. In this paper, a graph-based preconditioning conjugate gradient (GPCG) approach is proposed for the nodal parallel computing in N-1 CA. To pursue a higher performance in the practical application, the coefficient matrix of the base case is used as the incomplete LU (ILU) preconditioner for each N-1 scenario. Additionally, the re-dispatc","authors_text":"Chen Yuan, Guangyi Liu, Ilya Grinberg, Yiting Zhao","cross_cats":["cs.DS","cs.NA","math.NA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.DC","submitted_at":"2018-03-08T20:11:28Z","title":"Graph-based Preconditioning Conjugate Gradient Algorithm for N-1 Contingency Analysis"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1803.03290","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":"sha256:59a08237568c33fb6366a4daeaf13837b28b9d340447732412bd47a471aa8e15","target":"record","created_at":"2026-05-18T00:21:40Z","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":"ec6ed4a441e07f645165fae71cb26323fc4fe89dce5d81ac8c7f3fe860e0630e","cross_cats_sorted":["cs.DS","cs.NA","math.NA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.DC","submitted_at":"2018-03-08T20:11:28Z","title_canon_sha256":"ea58f09f10aefa12f9bf7aa0e99978f50207e199e0b93816a90f57640e23bb77"},"schema_version":"1.0","source":{"id":"1803.03290","kind":"arxiv","version":1}},"canonical_sha256":"ddd29c04b74149e533db84b785fd022351ef122ec491db709e6570021abf200d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ddd29c04b74149e533db84b785fd022351ef122ec491db709e6570021abf200d","first_computed_at":"2026-05-18T00:21:40.104235Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:21:40.104235Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"5ADVyB2QXfsWJuJy3dnTLZWkvu3tJe4CZ964IZIruPnDpDLndExmsj1Ubt3ZmEfxVmDPS5o1beiPB0wNlXYMBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:21:40.105004Z","signed_message":"canonical_sha256_bytes"},"source_id":"1803.03290","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:59a08237568c33fb6366a4daeaf13837b28b9d340447732412bd47a471aa8e15","sha256:0ee349b19488619569682b1c5a665077ee690bb6c5688f2eb1a1255cf9ddc072"],"state_sha256":"9303990488e552b1ce738795d085029dd576da48f00e6c7181013e27f9e38283"}