• 한국안전학회지
• /
• 제31권6호
• /
• pp.12-18
• /
• 2016

This paper describes an optimal design of electric snow melting mat on vulnerable walk zone. In order to design an optimal electric power of snow melting mat and protect pedestrians with a nonslip mat, with considering protection of environmental pollution from abusing of the de-icing salts added calcium chloride. We analyzed nine snow melting mats through verification experiment in the condition of $-5^{\circ}C$, depending on three different kinds of heating material, electric heating cable, carbon heating film and carbon textile film. As a consequence, the $150W/m^2$ carbon textile film mat for snow melting was identified as an optimal power input and functional performance for pedestrians' safety on vulnerable walk zone. It is expected that the $150W/m^2$ carbon textile film mat would be useful to reduce slip down accidents by human error.

• 대한안전경영과학회지
• /
• 제7권1호
• /
• pp.77-86
• /
• 2005

An investigation was conducted to evaluate both the time required and the time allowed for persons to cross streets. Currently, the local municipality uses a standardized formula to determine the time allotted for 'WALK' signals to function allowing pedestrian traffic to cross thoroughfares. The formula to determine the 'Theoretical Time(in seconds)' is the width of the street(in meter) divided by 1.2m/s. The basis of the denominator is 'normal' walking speed. Initially, 3 locations were chosen to evaluate the time between the appearance of the 'WALK' signal and the appearance of the 'DON'T WALK'. The interval between the two signals was assumed to allow a person to begin crossing the street at the appearance of the 'WALK' signal and terminate their crossing at the appearance of the 'DON'T WALK' signal. Of the 3 locations, 2 locations(elementary?middle schools and general hospital areas), the duration of the 'WALK' signal were not properly set and therefore need more time for those who use these cross walks. Specific details regarding the crossing locations and validity of the standardized formula were also presented and discussed.

• 디지털융복합연구
• /
• 제13권6호
• /
• pp.185-195
• /
• 2015

본 연구는 일 대학병원의 환자안전문화 정착을 위해 리더십 워크라운드(Leadership WalkrRounds, LWR) 프로그램을 개발 적용한 후 의료직의 환자안전문화 인식정도를 비교한 것이다. 리더십 워크라운드는 미국 의료질향상 연구소(IHI)의 도구와 미시건 대학의 환자안전 라운드(Patient Safety Rounds, PSRs)를 기반으로 준비-일정계획-운영-보고-문제해결 5단계로 구성하였다. 대상자의 평균 연령은 30.9세, 방사선사가 55.2%, 간호사가 26.0%, 약무직이 18.8%였다. 중재 후 환자안전문화 인식 총점은 2.63점에서 3.36점으로 유의하게 증가하였다(p<.001). 약무직, 여자, 30대 및 근무경력 1년 이하 그룹에서 인식정도가 가장 많이 상승하였다. 환자안전문화의 모든 영역에서 인식정도가 유의하게 상승했는데(p<.001), 특히 안전사고보고영역(p<.001), 의사소통영역(p<.001)이 가장 많이 상승하였다. 새로운 형태의 리더십과 환자안전관리 개념의 융합으로 의료 질관리에 새로운 관리방안을 시도한 리더십 워크라운드는 의료인의 환자안전문화 인식 향상에 유용한 프로그램으로 활용할 수 있을 것이다.

• 한국산업융합학회 논문집
• /
• 제22권3호
• /
• pp.353-364
• /
• 2019

The walk-way means a passage installed on the deck of a ship so that a person can safely move under any circumstances. So, the walk-way has to maintain a temperature of $5^{\circ}C$ or more for anti/de-icing even at an ambient temperature of $-62^{\circ}C$, a temperature in polar region. At present, the walk-way with heating cable is used, but the anti/de-icing effect is insufficient due to low heat transfer efficiency. Also, it has a construction problem due to heavy weight. In this study, an walk-way with a CNT surface heating element is proposed for the high anti/de-icing effect and the heating value per unit volume. The international standard survey, conceptual design, and simulation for the structural safety and the heat transfer are performed for the development of the proposed walk-way. To enhance the performance, the case studies based on the simulation analysis are conducted. Finally, the final prototype, applying the optimum material and thickness (3.2t of SS400) based on the case study results, is fabricated and experimented.

• 한국ITS학회 논문지
• /
• 제19권3호
• /
• pp.14-27
• /
• 2020

우리나라 교통사고 사망자 중 보행자 사망이 높은 비율을 차지하고 있어, 정책적으로 보행안전에 대한 관심이 높아지고 있다. 하지만 보행신호시간 계획의 경우 보행 편의 및 신호주기를 고려하지 않고 횡단보도 길이를 기준으로 보행신호시간을 적용하다 보니, 신호기가 설치된 폭이 좁은 부도로 횡단보도의 경우, 횡단거리에 비해 상대적으로 보행대기시간이 길어 보행자의 무단횡단을 유발하고 있다. 본 연구에서는 신호기가 설치된 부도로 횡단보도 중 불합리한 신호시간 계획으로 인해 보행자의 무단횡단이 많은 교차로를 대상으로 보행신호를 1주기 2회 부여하고 신호체계에 따른 운영적·안전적 효과를 정량적, 정성적으로 비교 분석하였다. 그 결과, 무단횡단과 보행대기시간이 감소하는 것으로 나타났으며, 보행신호시간 적용간격이 짧을수록 무단횡단은 감소하는 것으로 분석되었다. 다만, 보행자 노출에 따른 차량 상충위험이 있어 보행신호 1주기 2회 부여 운영에 대한 안전성 확대 방안을 제시하였다.

• 한국화재소방학회논문지
• /
• 제33권6호
• /
• pp.43-52
• /
• 2019

본 연구에서는 결정론적 화재방호 요건을 기반으로 하는 원자력발전소 화재모델링 현장실사(Walk-down) 수행절차를 개발하였다. 원전 화재모델링 현장실사 수행절차는 도면에 정확히 표시되지 않은 안전정지 기기 및 케이블에 대한 위치를 파악하고, 가연물 및 점화원의 존재여부와 위치를 파악하는 과정을 포함한다. 본 연구에서 개발한 현장 실사 절차의 성능을 검증하기 위해서 가상의 다중오동작 시나리오에 대해 샘플 안전정지 중요기기 및 케이블을 선정하였다. 또한 선정된 안전정지 기기 및 케이블을 대상으로 가상의 화재모델링 시나리오를 도출하여 이에 대한 실제 현장실사를 수행하였다. 현장실사를 통해서 수집한 발전소 정보는 화재모델링을 위한 입력 값을 도출하는데 사용될 수 있도록 도면에서 얻은 정보와 비교·검토 되었다.

• 한국산업보건학회지
• /
• 제17권2호
• /
• pp.120-130
• /
• 2007

A oxygen generating closed-circuit SCBA for escape from fire will be newly developed and then a program for estimating service time for it should be required. A SCBA made on an experimental basis consisted of five components such as half facepiece (mask), $KO_2$ box, oxygen reservoir, $CO_2$ remover and hood. The half mask had a good fitting performance since fit factors for 10 subjects were all above 100. It was found that height of subjects should be the best variable to estimate service time. Measured service time was inversely correlated with height of subjects. Service life time could be estimated by interpolation and extrapolation using inverse relationship between height and measured service time, for example, 28 minutes for male and female of 170 cm during resting, 10 minutes at the walk of 4 km/h and 5 minutes at the walk of 6 km/h considering safety margin of 20%. The study implies that program for estimating service time for the SCBA should require subject's height, speed of walk (4 km/h and 6 km/h) and fit testing. Considering safety margin, selecting younger subjects would be better. The study on the number of subjects and selecting facial dimensions should be more needed for the final program.

• 로봇학회논문지
• /
• 제12권2호
• /
• pp.116-123
• /
• 2017

Wearable robots are receiving great attention from the public, as well as researchers, because its motivation is to improve the quality of lives of people. Above all, complete paraplegic patients due to spinal cord injury (SCI) might be the most adequate target users of the wearable robots, because they definitely need physical assistance due to the complete loss of muscular strength and sensory functions. Furthermore, the medical care of complete paraplegics by using the wearable robots have significantly reduced the mortality rate and improved the life expectancy. The requirements of the wearable robot for complete paraplegics are actuation torque, locomotion speed, wearing sensation, robust gait stability, safety, and practicality (i.e., size, volume, weight, and energy efficiency). A WalkON Suit is the wearable robot that has satisfied the requirements of the wearable robot for complete paraplegics and participated in the powered exoskeleton race of Cybathlon 2016. In this paper, configuration of the WalkON Suit, human-machine interface, gait pattern, control algorithm, and evaluation results are introduced.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2009년도 춘계학술대회 논문집
• /
• pp.1673-1679
• /
• 2009

Korean railroad company is continuously improving the service for the disabled. They also install and reform many facilities for them. However, They didn't consider the egress of the disabled when fire occurred until today. At present, fire hazard analysis and risk assessment are introduced into Korea regulation for improving fire safety performance of train car and railroad facilities. Fire safety evaluation for the railroad conducted in Korea didn't generally consider the disabled. In the present situation, the study for the egress of the disabled in train car was needed. The egress experiment was conducted to measure the movement speed of the disabled who didn't walk or walk very slow.

• Safety and Health at Work
• /
• 제11권2호
• /
• pp.143-151
• /
• 2020

Objective: Bidi is an inexpensive, low-processed, hand-rolled tobacco product. In Bangladesh, especially in Rangpur, tobacco farming and bidi processing are common. In this study, we aimed to evaluate the impact of bidi making on children working in bidi factories. Methods: This qualitative(walk-through survey) and quantitative(questionnaire-based survey and a urine cotinine level quantitation) study was conducted in Rangpur, Bangladesh in 2017. Study population included child-workers aged ≤14 years who were regularly employed as bidi makers. Findings: The results of the walk-through survey revealed hazardous working environments at bidi factories. For the quantitative survey, 171 child-workers were categorized into "less-working"(<5 hours/day) and "more-working"(≥5 hours/day) groups; additionally, "forced-working"(forced into work by parents) and "voluntary-working"(working voluntarily) groups were delineated within the same population. In the logistic regression analysis, odds ratios(ORs) of respiratory symptoms and unusual absence(absent ≥5 days/month) were higher in the "more-working" group than in the "less-working" group(unusual absence: OR, 2.91; 95% confidence interval[CI], 1.43-5.94), and this association became higher in the "forced-working" group with longer working hours(OR, 5.68, 95%CI 2.30-14.00). Conclusions: Cheap, hand-rolled tobacco(bidi) is harmful to the health of bidi-making child-workers. Children in poverty bow to the demands of cheap labor and poverty and jeopardize their health and future prospects by working in bidi factories. Tobacco control policies should consider the social effects of tobacco beyond its biological effects.