{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:G2M44ZEMZZQ3DOXS2MNHB54KQY","short_pith_number":"pith:G2M44ZEM","canonical_record":{"source":{"id":"1908.02547","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.PF","submitted_at":"2019-08-04T19:19:42Z","cross_cats_sorted":["cs.SY","eess.SY"],"title_canon_sha256":"821d27ca9a9e7f931ae6edfdd30d8d9b7e00e9b94bc2951de634698f11d883d8","abstract_canon_sha256":"ed210d4ba65b816bcdc50381f1ae835646be5be1da78e371e50b46416ebbce49"},"schema_version":"1.0"},"canonical_sha256":"3699ce648cce61b1baf2d31a70f78a8624befbc87a4c89e37332f35749ad923b","source":{"kind":"arxiv","id":"1908.02547","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.02547","created_at":"2026-07-04T23:52:10Z"},{"alias_kind":"arxiv_version","alias_value":"1908.02547v1","created_at":"2026-07-04T23:52:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.02547","created_at":"2026-07-04T23:52:10Z"},{"alias_kind":"pith_short_12","alias_value":"G2M44ZEMZZQ3","created_at":"2026-07-04T23:52:10Z"},{"alias_kind":"pith_short_16","alias_value":"G2M44ZEMZZQ3DOXS","created_at":"2026-07-04T23:52:10Z"},{"alias_kind":"pith_short_8","alias_value":"G2M44ZEM","created_at":"2026-07-04T23:52:10Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:G2M44ZEMZZQ3DOXS2MNHB54KQY","target":"record","payload":{"canonical_record":{"source":{"id":"1908.02547","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.PF","submitted_at":"2019-08-04T19:19:42Z","cross_cats_sorted":["cs.SY","eess.SY"],"title_canon_sha256":"821d27ca9a9e7f931ae6edfdd30d8d9b7e00e9b94bc2951de634698f11d883d8","abstract_canon_sha256":"ed210d4ba65b816bcdc50381f1ae835646be5be1da78e371e50b46416ebbce49"},"schema_version":"1.0"},"canonical_sha256":"3699ce648cce61b1baf2d31a70f78a8624befbc87a4c89e37332f35749ad923b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T23:52:10.100941Z","signature_b64":"lVAQEURf4hnZYPBdugRBJVAGzdAARYJbFubcrLm7Ksqnzyfu16KafhvCX120AP27tFhHRIRpcU6M334LpppdAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3699ce648cce61b1baf2d31a70f78a8624befbc87a4c89e37332f35749ad923b","last_reissued_at":"2026-07-04T23:52:10.100585Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T23:52:10.100585Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1908.02547","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":"2026-07-04T23:52:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2poPEx279X82MQMqvmLqMPXbvRveeffjTV5gGpCcOhhXqYxf3XdqwCzuwnznUU9UfDdpWJr3ZMXs2/+gUverBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T14:45:37.893502Z"},"content_sha256":"255077df6546fbe95a60734e60e9cd1c07d6244f06ea8c8e7af86a4af53541da","schema_version":"1.0","event_id":"sha256:255077df6546fbe95a60734e60e9cd1c07d6244f06ea8c8e7af86a4af53541da"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:G2M44ZEMZZQ3DOXS2MNHB54KQY","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A Repairable System Supported by Two Spare Units and Serviced by Two Types of Repairers","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.SY","eess.SY"],"primary_cat":"cs.PF","authors_text":"Jyotirmoy Sarkar, Vahid Andalib","submitted_at":"2019-08-04T19:19:42Z","abstract_excerpt":"We study a one-unit repairable system, supported by two identical spare units on cold standby, and serviced by two types of repairers. The model applies, for instance, to ANSI (American National Standard Institute) centrifugal pumps in a chemical plant. The failed unit undergoes repair either by an in-house repairer within a random or deterministic patience time, or else by a visiting expert repairer. The expert repairs one or all failed units before leaving, and does so faster but at a higher cost rate than the regular repairer. Four models arise depending on the number of repairs done by the"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.02547","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1908.02547/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-04T23:52:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"94/8PXZAdE+wpE4FmJ5S1cy3RDDoVTaiO3n7fjqmY5XZJHBgobJPNJ4D+iSMmyAu6z+kry39qijrhmcc9c2bDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T14:45:37.894016Z"},"content_sha256":"a76696a8a711454c07f17456f4fb727905a9363e7f81596b79ae878862e2ff2c","schema_version":"1.0","event_id":"sha256:a76696a8a711454c07f17456f4fb727905a9363e7f81596b79ae878862e2ff2c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/G2M44ZEMZZQ3DOXS2MNHB54KQY/bundle.json","state_url":"https://pith.science/pith/G2M44ZEMZZQ3DOXS2MNHB54KQY/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/G2M44ZEMZZQ3DOXS2MNHB54KQY/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":"2026-08-16T14:45:37Z","links":{"resolver":"https://pith.science/pith/G2M44ZEMZZQ3DOXS2MNHB54KQY","bundle":"https://pith.science/pith/G2M44ZEMZZQ3DOXS2MNHB54KQY/bundle.json","state":"https://pith.science/pith/G2M44ZEMZZQ3DOXS2MNHB54KQY/state.json","well_known_bundle":"https://pith.science/.well-known/pith/G2M44ZEMZZQ3DOXS2MNHB54KQY/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:G2M44ZEMZZQ3DOXS2MNHB54KQY","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":"ed210d4ba65b816bcdc50381f1ae835646be5be1da78e371e50b46416ebbce49","cross_cats_sorted":["cs.SY","eess.SY"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.PF","submitted_at":"2019-08-04T19:19:42Z","title_canon_sha256":"821d27ca9a9e7f931ae6edfdd30d8d9b7e00e9b94bc2951de634698f11d883d8"},"schema_version":"1.0","source":{"id":"1908.02547","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.02547","created_at":"2026-07-04T23:52:10Z"},{"alias_kind":"arxiv_version","alias_value":"1908.02547v1","created_at":"2026-07-04T23:52:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.02547","created_at":"2026-07-04T23:52:10Z"},{"alias_kind":"pith_short_12","alias_value":"G2M44ZEMZZQ3","created_at":"2026-07-04T23:52:10Z"},{"alias_kind":"pith_short_16","alias_value":"G2M44ZEMZZQ3DOXS","created_at":"2026-07-04T23:52:10Z"},{"alias_kind":"pith_short_8","alias_value":"G2M44ZEM","created_at":"2026-07-04T23:52:10Z"}],"graph_snapshots":[{"event_id":"sha256:a76696a8a711454c07f17456f4fb727905a9363e7f81596b79ae878862e2ff2c","target":"graph","created_at":"2026-07-04T23:52:10Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/1908.02547/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We study a one-unit repairable system, supported by two identical spare units on cold standby, and serviced by two types of repairers. The model applies, for instance, to ANSI (American National Standard Institute) centrifugal pumps in a chemical plant. The failed unit undergoes repair either by an in-house repairer within a random or deterministic patience time, or else by a visiting expert repairer. The expert repairs one or all failed units before leaving, and does so faster but at a higher cost rate than the regular repairer. Four models arise depending on the number of repairs done by the","authors_text":"Jyotirmoy Sarkar, Vahid Andalib","cross_cats":["cs.SY","eess.SY"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.PF","submitted_at":"2019-08-04T19:19:42Z","title":"A Repairable System Supported by Two Spare Units and Serviced by Two Types of Repairers"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.02547","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":"sha256:255077df6546fbe95a60734e60e9cd1c07d6244f06ea8c8e7af86a4af53541da","target":"record","created_at":"2026-07-04T23:52:10Z","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":"ed210d4ba65b816bcdc50381f1ae835646be5be1da78e371e50b46416ebbce49","cross_cats_sorted":["cs.SY","eess.SY"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.PF","submitted_at":"2019-08-04T19:19:42Z","title_canon_sha256":"821d27ca9a9e7f931ae6edfdd30d8d9b7e00e9b94bc2951de634698f11d883d8"},"schema_version":"1.0","source":{"id":"1908.02547","kind":"arxiv","version":1}},"canonical_sha256":"3699ce648cce61b1baf2d31a70f78a8624befbc87a4c89e37332f35749ad923b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3699ce648cce61b1baf2d31a70f78a8624befbc87a4c89e37332f35749ad923b","first_computed_at":"2026-07-04T23:52:10.100585Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T23:52:10.100585Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"lVAQEURf4hnZYPBdugRBJVAGzdAARYJbFubcrLm7Ksqnzyfu16KafhvCX120AP27tFhHRIRpcU6M334LpppdAQ==","signature_status":"signed_v1","signed_at":"2026-07-04T23:52:10.100941Z","signed_message":"canonical_sha256_bytes"},"source_id":"1908.02547","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:255077df6546fbe95a60734e60e9cd1c07d6244f06ea8c8e7af86a4af53541da","sha256:a76696a8a711454c07f17456f4fb727905a9363e7f81596b79ae878862e2ff2c"],"state_sha256":"6a14ee6c669a2f87891585cff57a16d8c3036d5db688c062145460c65fbd16cd"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"X08cxTQKPkX8XT8J4NRRrG89WVtPJP8Jo+DGa7yEulqeiJcodRz0Juq76ixDCIkqJWMxfZEd1Bmq2oXdCVOMCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-16T14:45:37.898168Z","bundle_sha256":"7ac959def420707a3f58925170e265e658f93216c5f30125abda752ac7cefca9"}}