건설안전 산업기사 필기 족집게 기출 족보 강의 1화

Main ideas / lessons conveyed

• The lecture is a “guaranteed to appear” review for the Construction Safety Technician (산업기사) written exam, focusing on 80 past-question topics (notably many safety/organization/system concepts).
• Each numbered point is presented as an exam-relevant fact—intended to help learners memorize correct options rather than reason through problems on the spot.
• The speaker emphasizes that the content is high-density, delivered so learners can recognize correct answers quickly during the exam.

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Methodology / structure presented (as described in the subtitles)

Lecture format and study approach

• Use 80 past-exam questions as the core study set.
• Treat each statement as direct exam material (“guaranteed to appear”).
• Memorize thoroughly, because every detail is said to be tested.
• The lecture is described as:
  • Voice-actor delivered (to compress a lot of information into a short time)
  • A “pinpoint” (족집게) style class meant for rapid recall

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Detailed list of the 80 exam-point concepts (as stated)

1. ALC products: high water absorption; strong alkalinity → risk of deformation/cracking.
2. Wood strength vs moisture: strength decreases as moisture content increases.
3. Sand drain method for house measurement: used mainly in clayey houses.
4. Sound intensity (dB) reference: reference sound pressure frequency 1000 Hz.
5. System life cycle: preliminary risk analysis stage = conceptual stage.
6. Authority given by an organization to a leader: compensatory, coercive, legal authority.
7. Autoclave expansion test: a stability test for cement.
8. Clear lacquer: transparency level best indicating wood texture.
9. Wood specific gravity claim: 0.692 corresponds to supply rate 55.2% (as written).
10. Natural adhesives: starch, cross-linking, casein.
11. Thermoplastic resins: acrylic, vinyl chloride, polyethylene.
12. Ladder-type passageways: maintain ≥ 15 cm gap between platform and wall.
13. Compatibility: human expectations align with stimuli/responses.
14. Stratum corneum: first eye part to contact light (as stated).
15. Fibrous formwork surface strength increases due to dehydration effect.
16. Island cut method: central structure resists most earth pressure.
17. Concrete mix design: water-cement ratio most influential on strength.
18. Dragline: equipment for underwater soil extraction/scooping.
19. Steel weldability decreases as carbon content increases.
20. Recruitment methods claim (as stated): Q&A method corresponds to attitude assessment method.
21. Safety education stages: introduction, presentation, application, verification.
22. Level-of-learning elements: cognition, perception, understanding, application.
23. Consistency limit: boundary between semi-solid and plastic states = plastic limit.
24. Sheet pile construction categorized as earthwork.
25. Education elements: instructor, educational materials, student.
26. Sample temperature determined by temperature, convection, humidity.
27. Steel frame work stop criterion for rain: exceeds 1 mm/hour.
28. Steel frame work stop criterion for snowfall: exceeds 1 cm/hour.
29. Gray wavelength: cones show lowest sensitivity (as stated).
30. Diesel hammer (pile driving): produces loud impact sound.
31. Cement claim: alumina cement high fire resistance; ordinary Portland cement lateral strength develops within 24 hours after water (as stated).
32. Concrete side increases as ambient temperature decreases (as stated).
33. Max slope for temporary construction roads: 10%.
34. Column horizontal bending under end hinges: buckling.
35. “Mechanisms of smallness”: repression, aggression, rationalization.
36. Judgment background claim: anxious state, optimistic observation, and past success experiences.
37. Harvard “HaHa’s Five Steps of Teaching”: preparation, city, union, overall, application (wording unclear in subtitles).
38. System safety assessment sequence: organize data → qualitative evaluation → quantitative evaluation → countermeasures → re-evaluation.
39. “No-task” movement ideologies: principle of non-existence, principle of participation, principle of preemptive solution.
40. Steel construction welding defects: overlap, undercut, blowhole.
41. Compaction/vibration purpose: fill concrete to every corner of formwork.
42. Safety psychology elements: motivation, temperament, emotion, habit, custom.
43. Underground continuous wall method (black shoring): low vibration and noise.
44. If black shoring not installed during trench excavation: excavation depth must be ≤ 1.5 m.
45. Concrete carbonation test: use phenolphthalein solution.
46. Plastic products: low wear resistance.
47. Steel used to maintain formwork spacing: separator.
48. Moisture change deformation: minimal expansion/contraction.
49. Accident prevention principle: “every accident must have a cause” = principle of causation.
50. Rebar splicing methods: lap splices, mechanical splices, fusion splices.
51. Steel erection equipment: crawler crane = mobile erection equipment.
52. Lifespan shortening with higher overlap described as serial splice characteristic.
53. Hoisting wire rope safety factor for pile extractors: 5 or higher. (Numbering in subtitles jumps.)
54. Lift safety devices: anti-cracking, emergency stop, overload protection.
55. Tensile test: change point from elastic to plastic = yield point.
56. Large scaffold size criteria: support spacing and working load.
57. Component placement general location criteria: materiality principle and frequency of use principle.
58. Steel pipe scaffolding: max allowable load between scaffold columns ≤ 400 kg.
59. Cement fineness: the finer it is, the easier it is to weather (as stated).
60. Fully submerging wood prevents decay.
61. Slopes most dangerous when water level drops rapidly.
62. Ear structure: middle ear amplifies minute pressure changes to eardrum.
63. Lean construction: efficient production system minimizing waste.
64. Auditory signal reception functions: detection, location identification, absolute identification, relative identification.
65. “Unregulated” movement drivers: top executives’ management attitude; autonomous activities by small workplace groups; supervisors promoting safety/health.
66. Among metal pipes: best acid resistance = linkage (as stated).
67. Cement manufacturing process: first process = grinding main raw materials.
68. Safety education stages by characteristics: knowledge education, skills education, attitude education.
69. Maslow hierarchy: physiological, safety, social, esteem, self-actualization (subtitles omit/garble some text).
70. Stress directly causes reduced job engagement and productivity.
71. Clay materials: porcelain used for hygiene, toxic gases, and other purposes (as stated).
72. Four accident prevention principles: selecting countermeasures; loss contingency; preventability; causal linkage.
73. Home slope failure finite-type includes: internal failure, tip failure, base failure (as stated).
74. Cause-and-effect diagram: links causes and effects of accidents.
75. Soda-lime glass: general construction window glass.
76. Risk adjustment methods: risk retention, risk concealment, risk avoidance, risk transfer (as stated).
77. Thermosetting resins: euphosphate (unclear spelling), silicone, alkyd.
78. Shovel excavation equipment: clam shack most suitable for narrow/deep excavation.
79. Wood moisture content: at ≥ 30%, strength changes almost not at all with further increases/decreases (as stated).

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Speakers / sources featured (identified in subtitles)

• Yunse / Teacher Yoon (Teacher Yoon’s lecture) — the main presenter/lecturer
• Voice actor — mentioned as the delivery method (“conducted using a voice actor”)
• Harvard — referenced via “Harvard’s … Five Steps of Teaching” (exact named framework partially garbled in subtitles)