• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.46 no.1
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• pp.18-31
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• 2018

Rotorcrafts have more severe crashworthiness conditions than fixed wing aircraft owing to VTOL and hovering. Recently, with the increasing demand for highly efficient transportation system, application of composite materials to aircraft structures is increasing. However, due to the characteristics of composite materials that are susceptible to impact and crash, demand to prove the crashworthiness of composite structures is also increasing. The purpose of present study is to derive the structural concept of composite subfloor for rotorcrafts and verify it. In order to design a crashworthy composite subfloor, the conceptual design of the testbed helicopter for the demonstration and the derivation of energy absorbing requirement were carried out, and the composite energy absorber was designed and verified. Finally, the testbed for the demonstration of a crashworthy composite structure was fabricated, and performed free drop test. It was confirmed that the test results meet the criteria for ensuring occupant survivability.

• Korean Journal of Construction Engineering and Management
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• v.12 no.5
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• pp.71-80
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• 2011

Flying net should be installed on every 3 or 4 construction floor from 8m above ground according to the rule. In the apartment housing construction, flying net installation work has been recognized the most dangerous work among the whole works because a small mistake of labors might make their death accident. Sub-contractors specialized in flying net have been developing various flying net types. However, most works of installing flying net as working with the developed system are performed outside the apartment housing, so that the risk of fall in works of installing supports and unfolding net is still high. Furthermore, as using the previously developed flying net labors might bump into the frame or the wire rope for supporting so that it makes secondary accidents. The objective of this research is to produce the proto-type of anti-collision flying net system based on the result of problem analysis on the installation and detachment process and suggest the improved anti-collision flying net system, which is able to improve safety and field applicability by conducting field experiment and analyzing performance.

• Journal of Advanced Navigation Technology
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• v.26 no.5
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• pp.281-288
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• 2022

This study quantitatively analyzed the human casualties that can occur when a multicopter-type Urban Air Mobility (UAM) with a weight of about 1 ton and a speed of about 100 km/h falls in an urban area. Based on the population density and building database in Seoul, the population exposed to collisions in the event of a UAM crash was derived. Through the ballistic descent model, the accident impact radius of the UAM fall was calculated. In addition, the change in human casualties on the ground was analyzed when the accident impact radius increased. Finally, the ground risk map was created for Seoul, and it was confirmed that about 1 to 10 people could be injured when a UAM crash.

• 월간 기계설비
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• s.121
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• pp.84-91
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• 2000

산업재해예방은 사고로 인해 발생되는 인적손실과 물적손실을 방지할 뿐만 아니라 기계$\cdot$설비의 운전중지에 따른 감소를 방지하게 한다. 산업재해로 인한 경제손실액은 1998년도 한해만 7조2천5백억원으로 100억짜리 공장을 725개를 세울 수 있는 엄청난 금액이고 국민 총생산액의 1.9$\%$에 해당한다. 특히 건설업의 재해율은 1995년도에는 전국 평균 재해율을 상회하였으나, 매년 꾸준히 감소 추세를 보여 1999년도에는 0.6$\%$로 전체 0.71$\%$보다 낮게 나타났다. 1999년 건설업의 총 재해지수는 1만955명으로 발생형태별로 분류한 결과 주요 재해발생요인은 추락 3천145명(28.7$\%$), 전도 1천832명(16.7$\%$), 협착 1천461명(13.3$\%$), 낙하$\cdot$비례 1천305명(11.9$\%$), 충돌 866명(7.90$\%$), 감전 281명(2.56$\%$, 화재$\cdot$폭발 152명(1.39$\%$), 기타 1천913명(17.5$\%$)으로 나타났다. 본고는 설비공사와 관련 그동안 발생된 중대재해사례를 게재한 것이다.

• 월간 기계설비
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• s.123
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• pp.82-87
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• 2000

산업재해예방은 사고로 인해 발생되는 인적손실과 물적손실을 방지할 뿐만 아니라 기계$\cdot$설비의 운전중지에 따른 감소를 방지하게 한다. 산업재해로 인한 경제손실액은 1998년도 한해만 7조2천5백억원으로 100억짜리 공장을 725개를 세울 수 있는 엄청난 금액이고 국민 총생산액의 1.9$\%$에 해당한다. 특히 건설업의 재해율은 1995년도에는 전국 평균 재해율을 상회하였으나, 매년 꾸준히 감소 추세를 보여 1999년도에는 0.6$\%$로 전체 0.71$\%$보다 낮게 나타났다. 1999년 건설업의 총 재해지수는 1만955명으로 발생형태별로 분류한 결과 주요 재해발생요인은 추락 3천145명(28.7$\%$), 전도 1천832명(16.7$\%$), 협착 1천461명(13.3$\%$), 낙하$\cdot$비례 1천305명(11.9$\%$), 충돌 866명(7.90$\%$), 감전 281명(2.56$\%$, 화재$\cdot$폭발 152명(1.39$\%$), 기타 1천913명(17.5$\%$)으로 나타났다. 본고는 지난 8월호부터 연재되었으며, 설비공사와 관련 그동안 발생된 중대재해사례를 게재한 것이다.

• 월간 기계설비
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• s.125
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• pp.82-88
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• 2000

산업재해예방은 사고로 인해 발생되는 인적손실과 물적손실을 방지할 뿐만 아니라 기계$\cdot$설비의 운전중지에 따른 감소를 방지하게 한다. 산업재해로 인한 경제손실액은 1998년도 한해만 7조2천5백억원으로 100억짜리 공장을 725개를 세울 수 있는 엄청난 금액이고 국민 총생산액의 1.9$\%$에 해당한다. 특히 건설업의 재해율은 1995년도에는 전국 평균 재해율을 상회하였으나, 매년 꾸준히 감소 추세를 보여 1999년도에는 0.6$\%$로 전체 0.71$\%$보다 낮게 나타났다. 1999년 건설업의 총 재해지수는 1만955명으로 발생형태별로 분류한 결과 주요 재해발생요인은 추락 3천145명(28.7$\%$), 전도 1천832명(16.7$\%$), 협착 1천461명(13.3$\%$), 낙하$\cdot$비례 1천305명(11.9$\%$), 충돌 866명(7.90$\%$), 감전 281명(2.56$\%$, 화재$\cdot$폭발 152명(1.39$\%$), 기타 1천913명(17.5$\%$)으로 나타났다. 본고는 지난 8월호(11월호 휴재)부터 연재되었으며, 설비공사와 관련 그동안 발생된 중대재해사례를 게재한 것이다.

• 월간 기계설비
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• s.122
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• pp.86-91
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• 2000

산업재해예방은 사고로 인해 발생되는 인적손실과 물적손실을 방지할 뿐만 아니라 기계$\cdot$설비의 운전중지에 따른 감소를 방지하게 한다. 산업재해로 인한 경제손실액은 1998년도 한해만 7조2천5백억원으로 100억짜리 공장을 725개를 세울 수 있는 엄청난 금액이고 국민 총생산액의 1.9$\%$에 해당한다. 특히 건설업의 재해율은 1995년도에는 전국 평균 재해율을 상회하였으나, 매년 꾸준히 감소 추세를 보여 1999년도에는 0.6$\%$로 전체 0.71$\%$보다 낮게 나타났다. 1999년 건설업의 총 재해지수는 1만955명으로 발생형태별로 분류한 결과 주요 재해발생요인은 추락 3천145명(28.7$\%$), 전도 1천832명(16.7$\%$), 협착 1천461명(13.3$\%$), 낙하$\cdot$비례 1천305명(11.9$\%$), 충돌 866명(7.90$\%$), 감전 281명(2.56$\%$, 화재$\cdot$폭발 152명(1.39$\%$), 기타 1천913명(17.5$\%$)으로 나타났다. 본고는 설비공사와 관련 그동안 발생된 중대재해사례를 게재한 것이다.

• Journal of Preventive Medicine and Public Health
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• v.14 no.1
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• pp.81-88
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• 1981

The present study was conducted to investigate the status of industrial injuries through a prospective study for a year from August 1980 to July 1981. The subjects were 15 textile industries which were selected by random sampling in Daegu. The results obtained are as follows: Anual over-all incidence rate of industrial injuries was 3.3 percent and the rate showed 6.7 percent in male and 2 percent in female. The rate showed decreasing tendency with larger scale of industries. By the age group, $15{\sim}19$ age group was the highest as 49.3 percent. Age specific incidence rate of industrial injuries revealed highest as 4.7 precent among the group the group of 30 years old and over. By the years of service, 57.1 percent of the total cases belonged to the the group less than 1 year and the rate revealed increasing tendency with shorter period of service. The highest frequency of industrial injuries was observed at the point of 3 hours after the beginning of the work in a day as 18.1 percent. Frequency of industrial injuries showed highest as 20.3 percent on Monday. Frequency of industrial injuries was highest as 27.7 percent in winter time and showed 14 percent and 11.8 percent in January and August, respectively. By the cause of injuries, machinery accidents showed the highest as 39.2 percent and followed by the accidents due to striking against object as 17.8 percent, fall of ground as 16.3 percent and hand tool as 7.2 percent. Frequency of injured parts of body was highest as 43.9 percent in fingers. The frequency was much higher in upper extremities (66.9%) than in lower extremities (17.6%). By the kind of injuries, laceration wound was highestas 35.7 percent and the next was superficial injury and contusion as 35.1 percent. By the duration of treatment, most of the cases was belonged to the group less than 1 month as 79.1 percent and the duration showed prolonging tendency with larger scale of industries.