{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:OKHZMLIUN6J55OXY673F7CQFCO","short_pith_number":"pith:OKHZMLIU","canonical_record":{"source":{"id":"1310.4880","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.OH","submitted_at":"2013-10-18T01:21:25Z","cross_cats_sorted":[],"title_canon_sha256":"fb6da154b718c11869a3facfccae625d375e26eec24aff87132a860f95d3d3e7","abstract_canon_sha256":"96b67764f8cc4b4c2f73d745a66f40f79259c5d3aac13b43763fd9cb35500fe8"},"schema_version":"1.0"},"canonical_sha256":"728f962d146f93debaf8f7f65f8a0513829bdae50ec03e259729a2903d64eb0a","source":{"kind":"arxiv","id":"1310.4880","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1310.4880","created_at":"2026-05-18T01:25:39Z"},{"alias_kind":"arxiv_version","alias_value":"1310.4880v2","created_at":"2026-05-18T01:25:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1310.4880","created_at":"2026-05-18T01:25:39Z"},{"alias_kind":"pith_short_12","alias_value":"OKHZMLIUN6J5","created_at":"2026-05-18T12:27:54Z"},{"alias_kind":"pith_short_16","alias_value":"OKHZMLIUN6J55OXY","created_at":"2026-05-18T12:27:54Z"},{"alias_kind":"pith_short_8","alias_value":"OKHZMLIU","created_at":"2026-05-18T12:27:54Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:OKHZMLIUN6J55OXY673F7CQFCO","target":"record","payload":{"canonical_record":{"source":{"id":"1310.4880","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.OH","submitted_at":"2013-10-18T01:21:25Z","cross_cats_sorted":[],"title_canon_sha256":"fb6da154b718c11869a3facfccae625d375e26eec24aff87132a860f95d3d3e7","abstract_canon_sha256":"96b67764f8cc4b4c2f73d745a66f40f79259c5d3aac13b43763fd9cb35500fe8"},"schema_version":"1.0"},"canonical_sha256":"728f962d146f93debaf8f7f65f8a0513829bdae50ec03e259729a2903d64eb0a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:25:39.926776Z","signature_b64":"7ocwRVETxrymJo/1zb0qUqy40Qp+qJiHpU0FXGg50mY+Z+hH7Rj6QGNKYM6SFdoS4jhl8GqRZJnnm3gtBd7jDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"728f962d146f93debaf8f7f65f8a0513829bdae50ec03e259729a2903d64eb0a","last_reissued_at":"2026-05-18T01:25:39.925977Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:25:39.925977Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1310.4880","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:25:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Ua+2FiSvMcpNLSfgUb6mFNYBrjy2Wx1UsskXb5bz2+kpRE8fKKwqYrvvd6V/1CfYuksRf3p7x5rvvMIz2zKwDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T22:11:04.215921Z"},"content_sha256":"8b611200a16c29a29fd421767e59e7e98445b8bcbed14fe01407944945057761","schema_version":"1.0","event_id":"sha256:8b611200a16c29a29fd421767e59e7e98445b8bcbed14fe01407944945057761"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:OKHZMLIUN6J55OXY673F7CQFCO","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Gait Velocity Estimation using time interleaved between Consecutive Passive IR Sensor Activations","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.OH","authors_text":"Daniel Austin, Jeffrey Kaye, Mohanraj Karunanithi, Peter G. Jacobs, Rajib Rana","submitted_at":"2013-10-18T01:21:25Z","abstract_excerpt":"Gait velocity has been consistently shown to be an important indicator and predictor of health status, especially in older adults. It is often assessed clinically, but the assessments occur infrequently and do not allow optimal detection of key health changes when they occur. In this paper, we show that the time gap between activations of a pair of Passive Infrared (PIR) motion sensors installed in the consecutively visited room pair carry rich latent information about a person's gait velocity. We name this time gap transition time and show that despite a six second refractory period of the PI"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1310.4880","kind":"arxiv","version":2},"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":"2026-05-18T01:25:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"E5O3psYfTR5LW+bWFjG/0TaxgzNQ+h5mKQDanGusuqLprwH+HUCTtB7XeG/SgWoaJY4wmebk8baAPNHqt+euDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T22:11:04.216576Z"},"content_sha256":"8d42205e1b4ebd6993cd2e5d0b25d718f2fedb82dcb032ba985a1979b3c9cdf0","schema_version":"1.0","event_id":"sha256:8d42205e1b4ebd6993cd2e5d0b25d718f2fedb82dcb032ba985a1979b3c9cdf0"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/OKHZMLIUN6J55OXY673F7CQFCO/bundle.json","state_url":"https://pith.science/pith/OKHZMLIUN6J55OXY673F7CQFCO/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/OKHZMLIUN6J55OXY673F7CQFCO/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":"2026-05-26T22:11:04Z","links":{"resolver":"https://pith.science/pith/OKHZMLIUN6J55OXY673F7CQFCO","bundle":"https://pith.science/pith/OKHZMLIUN6J55OXY673F7CQFCO/bundle.json","state":"https://pith.science/pith/OKHZMLIUN6J55OXY673F7CQFCO/state.json","well_known_bundle":"https://pith.science/.well-known/pith/OKHZMLIUN6J55OXY673F7CQFCO/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:OKHZMLIUN6J55OXY673F7CQFCO","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":"96b67764f8cc4b4c2f73d745a66f40f79259c5d3aac13b43763fd9cb35500fe8","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.OH","submitted_at":"2013-10-18T01:21:25Z","title_canon_sha256":"fb6da154b718c11869a3facfccae625d375e26eec24aff87132a860f95d3d3e7"},"schema_version":"1.0","source":{"id":"1310.4880","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1310.4880","created_at":"2026-05-18T01:25:39Z"},{"alias_kind":"arxiv_version","alias_value":"1310.4880v2","created_at":"2026-05-18T01:25:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1310.4880","created_at":"2026-05-18T01:25:39Z"},{"alias_kind":"pith_short_12","alias_value":"OKHZMLIUN6J5","created_at":"2026-05-18T12:27:54Z"},{"alias_kind":"pith_short_16","alias_value":"OKHZMLIUN6J55OXY","created_at":"2026-05-18T12:27:54Z"},{"alias_kind":"pith_short_8","alias_value":"OKHZMLIU","created_at":"2026-05-18T12:27:54Z"}],"graph_snapshots":[{"event_id":"sha256:8d42205e1b4ebd6993cd2e5d0b25d718f2fedb82dcb032ba985a1979b3c9cdf0","target":"graph","created_at":"2026-05-18T01:25:39Z","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":"Gait velocity has been consistently shown to be an important indicator and predictor of health status, especially in older adults. It is often assessed clinically, but the assessments occur infrequently and do not allow optimal detection of key health changes when they occur. In this paper, we show that the time gap between activations of a pair of Passive Infrared (PIR) motion sensors installed in the consecutively visited room pair carry rich latent information about a person's gait velocity. We name this time gap transition time and show that despite a six second refractory period of the PI","authors_text":"Daniel Austin, Jeffrey Kaye, Mohanraj Karunanithi, Peter G. Jacobs, Rajib Rana","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.OH","submitted_at":"2013-10-18T01:21:25Z","title":"Gait Velocity Estimation using time interleaved between Consecutive Passive IR Sensor Activations"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1310.4880","kind":"arxiv","version":2},"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":"sha256:8b611200a16c29a29fd421767e59e7e98445b8bcbed14fe01407944945057761","target":"record","created_at":"2026-05-18T01:25:39Z","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":"96b67764f8cc4b4c2f73d745a66f40f79259c5d3aac13b43763fd9cb35500fe8","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.OH","submitted_at":"2013-10-18T01:21:25Z","title_canon_sha256":"fb6da154b718c11869a3facfccae625d375e26eec24aff87132a860f95d3d3e7"},"schema_version":"1.0","source":{"id":"1310.4880","kind":"arxiv","version":2}},"canonical_sha256":"728f962d146f93debaf8f7f65f8a0513829bdae50ec03e259729a2903d64eb0a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"728f962d146f93debaf8f7f65f8a0513829bdae50ec03e259729a2903d64eb0a","first_computed_at":"2026-05-18T01:25:39.925977Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:25:39.925977Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"7ocwRVETxrymJo/1zb0qUqy40Qp+qJiHpU0FXGg50mY+Z+hH7Rj6QGNKYM6SFdoS4jhl8GqRZJnnm3gtBd7jDw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:25:39.926776Z","signed_message":"canonical_sha256_bytes"},"source_id":"1310.4880","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8b611200a16c29a29fd421767e59e7e98445b8bcbed14fe01407944945057761","sha256:8d42205e1b4ebd6993cd2e5d0b25d718f2fedb82dcb032ba985a1979b3c9cdf0"],"state_sha256":"6e0810eaa4b06707a9ed2eb9d51a2529a19d586254c05bdd750bb9f0dae2529d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Xsmd1ISVsmJL01SN81AkRlVcQOpg3RGvyoZgmeNwQSZSTP+4Rr7SjqnPS9oDCbbYIYPN6Wj+Wl0SEXr0WqoeBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T22:11:04.219948Z","bundle_sha256":"9497fa2d8af9a4847fea0e33b5f0e3ec11c8cb3672bc208aafaf73ae49509b48"}}