{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:QM6OXX7M4434EEUMVHHEXX4D7L","short_pith_number":"pith:QM6OXX7M","canonical_record":{"source":{"id":"1201.2902","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.LG","submitted_at":"2012-01-13T17:46:17Z","cross_cats_sorted":[],"title_canon_sha256":"370af89707b8724b5d4988fa7cedf484df9de957a37eb56abd9e65d3d43c0a9e","abstract_canon_sha256":"101386139ee8cfedd8df33fe77a28a531c616524c89fd27baf4c7fe2295731fe"},"schema_version":"1.0"},"canonical_sha256":"833cebdfece737c2128ca9ce4bdf83fae5aef5a531906024e7898d9c20e2d1cf","source":{"kind":"arxiv","id":"1201.2902","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1201.2902","created_at":"2026-05-18T04:04:42Z"},{"alias_kind":"arxiv_version","alias_value":"1201.2902v1","created_at":"2026-05-18T04:04:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1201.2902","created_at":"2026-05-18T04:04:42Z"},{"alias_kind":"pith_short_12","alias_value":"QM6OXX7M4434","created_at":"2026-05-18T12:27:18Z"},{"alias_kind":"pith_short_16","alias_value":"QM6OXX7M4434EEUM","created_at":"2026-05-18T12:27:18Z"},{"alias_kind":"pith_short_8","alias_value":"QM6OXX7M","created_at":"2026-05-18T12:27:18Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:QM6OXX7M4434EEUMVHHEXX4D7L","target":"record","payload":{"canonical_record":{"source":{"id":"1201.2902","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.LG","submitted_at":"2012-01-13T17:46:17Z","cross_cats_sorted":[],"title_canon_sha256":"370af89707b8724b5d4988fa7cedf484df9de957a37eb56abd9e65d3d43c0a9e","abstract_canon_sha256":"101386139ee8cfedd8df33fe77a28a531c616524c89fd27baf4c7fe2295731fe"},"schema_version":"1.0"},"canonical_sha256":"833cebdfece737c2128ca9ce4bdf83fae5aef5a531906024e7898d9c20e2d1cf","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:04:42.948292Z","signature_b64":"uKe63fH7T0NaIcQWFGspD2JpEKIjIr76VkmA9lXmKTKwXQT0+bRdqCre7sLV4aVM2l0mSwyJxm15Gbq4ZPt2AQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"833cebdfece737c2128ca9ce4bdf83fae5aef5a531906024e7898d9c20e2d1cf","last_reissued_at":"2026-05-18T04:04:42.947840Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:04:42.947840Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1201.2902","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":"2026-05-18T04:04:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MIUyRjaut5Y9iwqpheu4OiB4/bRQ9yvwLmJejSKDusIb6YXktqC5lB5DULkKTvUzcoOBST2doTPu+Ra5cxCQAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-30T19:20:31.687460Z"},"content_sha256":"eceac4efab6f434401f887a4a043a6eba70f0dcf41d1134ff8015062057767f5","schema_version":"1.0","event_id":"sha256:eceac4efab6f434401f887a4a043a6eba70f0dcf41d1134ff8015062057767f5"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:QM6OXX7M4434EEUMVHHEXX4D7L","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Acoustical Quality Assessment of the Classroom Environment","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.LG","authors_text":"Marian George, Moustafa Youssef","submitted_at":"2012-01-13T17:46:17Z","abstract_excerpt":"Teaching is one of the most important factors affecting any education system. Many research efforts have been conducted to facilitate the presentation modes used by instructors in classrooms as well as provide means for students to review lectures through web browsers. Other studies have been made to provide acoustical design recommendations for classrooms like room size and reverberation times. However, using acoustical features of classrooms as a way to provide education systems with feedback about the learning process was not thoroughly investigated in any of these studies. We propose a sys"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1201.2902","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":"2026-05-18T04:04:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RM/9W4GexgBcnxnQYVGJOap3uAlWV9WbplVKECnFFmY8+zPc8zBhVl6qTNOWp/vOWXLgH6k1Aq1L4rVokW5WDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-30T19:20:31.687817Z"},"content_sha256":"e8fefa240b774e848cb86f580ce176170d27da633f16b7234ff2e42cda491904","schema_version":"1.0","event_id":"sha256:e8fefa240b774e848cb86f580ce176170d27da633f16b7234ff2e42cda491904"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/QM6OXX7M4434EEUMVHHEXX4D7L/bundle.json","state_url":"https://pith.science/pith/QM6OXX7M4434EEUMVHHEXX4D7L/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/QM6OXX7M4434EEUMVHHEXX4D7L/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":"2026-06-30T19:20:31Z","links":{"resolver":"https://pith.science/pith/QM6OXX7M4434EEUMVHHEXX4D7L","bundle":"https://pith.science/pith/QM6OXX7M4434EEUMVHHEXX4D7L/bundle.json","state":"https://pith.science/pith/QM6OXX7M4434EEUMVHHEXX4D7L/state.json","well_known_bundle":"https://pith.science/.well-known/pith/QM6OXX7M4434EEUMVHHEXX4D7L/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:QM6OXX7M4434EEUMVHHEXX4D7L","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":"101386139ee8cfedd8df33fe77a28a531c616524c89fd27baf4c7fe2295731fe","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.LG","submitted_at":"2012-01-13T17:46:17Z","title_canon_sha256":"370af89707b8724b5d4988fa7cedf484df9de957a37eb56abd9e65d3d43c0a9e"},"schema_version":"1.0","source":{"id":"1201.2902","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1201.2902","created_at":"2026-05-18T04:04:42Z"},{"alias_kind":"arxiv_version","alias_value":"1201.2902v1","created_at":"2026-05-18T04:04:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1201.2902","created_at":"2026-05-18T04:04:42Z"},{"alias_kind":"pith_short_12","alias_value":"QM6OXX7M4434","created_at":"2026-05-18T12:27:18Z"},{"alias_kind":"pith_short_16","alias_value":"QM6OXX7M4434EEUM","created_at":"2026-05-18T12:27:18Z"},{"alias_kind":"pith_short_8","alias_value":"QM6OXX7M","created_at":"2026-05-18T12:27:18Z"}],"graph_snapshots":[{"event_id":"sha256:e8fefa240b774e848cb86f580ce176170d27da633f16b7234ff2e42cda491904","target":"graph","created_at":"2026-05-18T04:04:42Z","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":"Teaching is one of the most important factors affecting any education system. Many research efforts have been conducted to facilitate the presentation modes used by instructors in classrooms as well as provide means for students to review lectures through web browsers. Other studies have been made to provide acoustical design recommendations for classrooms like room size and reverberation times. However, using acoustical features of classrooms as a way to provide education systems with feedback about the learning process was not thoroughly investigated in any of these studies. We propose a sys","authors_text":"Marian George, Moustafa Youssef","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.LG","submitted_at":"2012-01-13T17:46:17Z","title":"Acoustical Quality Assessment of the Classroom Environment"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1201.2902","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:eceac4efab6f434401f887a4a043a6eba70f0dcf41d1134ff8015062057767f5","target":"record","created_at":"2026-05-18T04:04:42Z","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":"101386139ee8cfedd8df33fe77a28a531c616524c89fd27baf4c7fe2295731fe","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.LG","submitted_at":"2012-01-13T17:46:17Z","title_canon_sha256":"370af89707b8724b5d4988fa7cedf484df9de957a37eb56abd9e65d3d43c0a9e"},"schema_version":"1.0","source":{"id":"1201.2902","kind":"arxiv","version":1}},"canonical_sha256":"833cebdfece737c2128ca9ce4bdf83fae5aef5a531906024e7898d9c20e2d1cf","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"833cebdfece737c2128ca9ce4bdf83fae5aef5a531906024e7898d9c20e2d1cf","first_computed_at":"2026-05-18T04:04:42.947840Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:04:42.947840Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"uKe63fH7T0NaIcQWFGspD2JpEKIjIr76VkmA9lXmKTKwXQT0+bRdqCre7sLV4aVM2l0mSwyJxm15Gbq4ZPt2AQ==","signature_status":"signed_v1","signed_at":"2026-05-18T04:04:42.948292Z","signed_message":"canonical_sha256_bytes"},"source_id":"1201.2902","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:eceac4efab6f434401f887a4a043a6eba70f0dcf41d1134ff8015062057767f5","sha256:e8fefa240b774e848cb86f580ce176170d27da633f16b7234ff2e42cda491904"],"state_sha256":"1035c077c11197f58ba155d3b301069a880a6ee71b032cdac1b360c3d5ff2b67"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"67QUS2BqEG33WIuzG0ZaALL5TLlOf8mNpdDr46mWvTCnDDzrrbq4HAnaBEd6CV3lrkZQcADfp2iNGEeJA51qCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-30T19:20:31.690056Z","bundle_sha256":"da1a645626908166dfc661dfdfd908d5d66b5d0c076814a1b9045e1f13e75f47"}}