• Title/Summary/Keyword: safety helmet

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A study on Detecting the Safety helmet wearing using YOLOv5-S model and transfer learning

  • Kwak, NaeJoung;Kim, DongJu
    • International Journal of Advanced Culture Technology
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    • v.10 no.1
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    • pp.302-309
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    • 2022
  • Occupational safety accidents are caused by various factors, and it is difficult to predict when and why they occur, and it is directly related to the lives of workers, so the interest in safety accidents is increasing every year. Therefore, in order to reduce safety accidents at industrial fields, workers are required to wear personal protective equipment. In this paper, we proposes a method to automatically check whether workers are wearing safety helmets among the protective equipment in the industrial field. It detects whether or not the helmet is worn using YOLOv5, a computer vision-based deep learning object detection algorithm. We transfer learning the s model among Yolov5 models with different learning rates and epochs, evaluate the performance, and select the optimal model. The selected model showed a performance of 0.959 mAP.

A Study on Improving Shock Absorption Test of Safety Helmet (안전모의 충격 흡수성 시험 개선에 관한 연구)

  • Sang Woo Shim;Yong Su Sim;Jong Bin Lee;Seong Rok Chang
    • Journal of the Korean Society of Safety
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    • v.38 no.5
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    • pp.36-42
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    • 2023
  • In this study, 50 ABE-type hard hats were procured from five certified commercial manufacturers, and shock absorption tests were conducted in accordance with Protective Equipment Safety Certification Notice No. 2020-35. The tests were performed under both high- and low-temperature conditions, adhering to safety helmet testing standards. The highest shock transmission ranges were recorded in the tests, with an average energy range of 2,600-4,108 N at high temperatures and 2,316-3,991 N at low temperatures. All five hard hat models demonstrated a maximum transmitted impact force below 4,450 N, without any loss of cap and attachment functionality, confirming their compliance with performance standards. Furthermore, we evaluated the side impact performance of the safety helmets of each company, with an average range of 4,722-5,267 N. Company A exhibited the lowest measurement at 4,722 N. Comparing these results with international safety standards and the national shock absorption test criteria, it was observed that the maximum transmitted shock value using government-specified impact weight falls within the range of 4,450-5,000 N. However, it was noted that developed countries have established specific standards for the side impact forces on safety helmets, which are legally mandated. Consequently, it is imperative for South Korea to enhance its safety helmet side impact performance test methodology to align with domestic standards in the future.

Development of Skin Type Airbag Helmet through Consumer Oriented Concept Design and the Cushion Part's Impact Analysis (소비자 맞춤형 개념설계 및 쿠션부 충격해석을 통한 외피형 에어백 헬멧 개발)

  • Jung, In-Duck;Lee, Yong-Moon;Oh, Mi-Ok;Kim, Seung-Chul;Lee, Tae-Gu;Kang, MyungChang
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.15 no.6
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    • pp.101-108
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    • 2016
  • This study was initiated to minimize head injuries, which is the largest cause of increased external activity, traffic accident injuries, and death. We developed a low cost airbag that can be covered by a safety helmet based on consumer needs. The results of the survey showed that safety is the most important aspect of consumers' safety helmets. It also predicted that increasing the weight would present the biggest problem. Curved airbag cushion parts that can be attached to a helmet and the sensor part of a block type were designed. Impact analysis was performed by specifying the pressure inside the airbag and the volume of the airbag as variables.

Development of New Helmet using 2nd Look VE (2nd Look VE를 이용한 오토바이 헬멧 개발에 관한 연구)

  • Kim Kwang-So
    • Journal of the Korea Safety Management & Science
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    • v.8 no.1
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    • pp.145-164
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    • 2006
  • Value Engineering(VE) has been recognized by many companies as a powerful and innovative technical approach for cost down and improvement in function of product and service. VE is a discipline which use an organized, creative approach to achieve the required function at the lowest cost. For the Purpose of developing new product, at this paper used the method of 2nd look VE developing bike helmet, in the order of selecting target, function analysis and writing alternative. The development of Helmet by the process of VE job plan, achieve the cost reduction of 27 million won for developing new product with customer's need.

A Study on the Optimized Design of the Helmets for Fire and Gas Safety (소방.가스안전용 헬멧의 최적설계에 관한 연구)

  • Cho, Seung-Hyun;Kim, Do-Hyun;Kim, Chung-Kyun
    • Journal of the Korean Institute of Gas
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    • v.12 no.3
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    • pp.24-30
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    • 2008
  • In this paper, the stress and strain characteristics of a helmet shell structure have been analyzed by using the finite element method and Taguchi's design method as functions of the material properties, the thickness of a helmet, the thickness and the number of a bead frame. The optimized design of the helmets for a firefighter and a gas worker is very important for increasing the strength safety and an impact energy absorption capacity of a helmet shell due to an impulsive external force. Thus, the optimized design data of the helmet indicated that the uniform thickness of a helmet shell may be reduced for reducing the total weight of a helmet and increasing the strain energy absorption rate, but the thickness and the number of a bead frame would be increased for increasing the impact strength of the helmet.

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Finite element analysis for the impact stability investigation of the motorcycle helmet (오토바이 헬멧의 충돌 안정성 검토를 위한 유한요소해석)

  • Yu, B.M.;Song, J.S.;Kim, D.;Lee, S.K.;Kim, Y.H.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2007.05a
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    • pp.409-412
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    • 2007
  • A motorcycle helmet is the best means to protect the head of bike's driver and it is directly connected to a driver's life. Prior to producing of the helmet, it has to be passed the process of impact test to evaluate of its safety. This test evaluates peak acceleration and H.I.C (Head Injury Criteria). This paper analyzes impact test with finite element method to find the behavior of helmet during the test. Also, the effect of impact sites on the helmet was evaluated to improve the thickness distribution of the helmet.

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Investigation for Impact Stability of the Motorcycle Helmet by Using Finite Element Method (유한요소법을 이용한 오토바이 헬멧의 충돌 안정성 검토)

  • Yu, B.M.;Song, J.S.;Kim, D.;Lee, S.K.;Kim, Y.H.
    • Transactions of Materials Processing
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    • v.16 no.5 s.95
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    • pp.370-374
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    • 2007
  • A motorcycle helmet is very essential to protect the head of driver and it is directly connected to driver's life. Prior to producing the helmet, it has to be passed the process of impact test to evaluate its safety. This test evaluates peak acceleration and head injury criteria (H.I.C.). This paper simulates the impact test with finite element method to find the behavior of helmet during the test. Also, the effect of impact sites on the helmet was evaluated to improve the thickness distribution of the helmet.

Personal Mobility Safety Helmet Device using Multi-Sensor and Arduino (다중센서 및 아두이노를 활용한 Personal Mobility 스마트헬멧)

  • Dae-Hyun Kim;Won-Young Yang;Dong-Wook Han;Ju-Min Ham;Boong-Joo Lee
    • The Journal of the Korea institute of electronic communication sciences
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    • v.18 no.4
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    • pp.723-730
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    • 2023
  • Due to the recent development of battery technology, various types of means of transportation such as electric kickboards, Segways, and electric bicycles have emerged, which can be defined as Personal Mobility. In this paper, as the incidence of safety accidents increases due to the increase in the number of users of Personal Mobility, safety helmet devices that strengthen safety capabilities and peripheral recognition functions were studied. In order for the helmet to send a safety signal, Arduino was used as a base to set the value of the sensor according to changes in distance and angle using the ultrasonic sensor to minimize errors and ensure smooth recognition. In addition, a gyro sensor was used to turn on the direction indicator according to each slope. Using a CDS sensor, the LED is designed to turn on when it goes below 150 lux at night. Finally, it is possible to check whether a helmet is worn within 5cm, and when driving at an average speed, the direction indicator light is turned on at 10 degrees, and the LED is turned on at less than 150 lux.

Structure and Technology of Personal Protection Helmets (인체보호용 헬멧의 구조 및 기술)

  • Hwang, Jae Hyung;Jeong, Won Young
    • Journal of the Korean Society of Clothing and Textiles
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    • v.41 no.4
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    • pp.771-781
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    • 2017
  • The helmet is an imperative personal protective equipment. This protective device must be able to guard the human head against potential risks. Helmets are classified according into the purpose of use; therefore, the required performance and specifications depend on the type of products. Military helmets are intended to protect the wearer's head from bullets and shrapnel. Generally, lightweight super fibers and fiber reinforced composite materials are used as helmet shell materials, and NIJ STD of U.S. Department of Justice is most widely used as international standard related to bulletproof helmets. Safety helmets are widely used for industrial application and sports leisure. In general, the performance of shock absorption must be ensured, and various lining systems are applied in material, design, and combination methods. Evaluation standards have also been classified and strictly controlled for each purpose; therefore, it is difficult to certify with the existing standards such as the recently developed convergence helmets. However, it is possible to launch the product through a separate national integrated certification procedure.

Statistical Analysis of Major Accident Reports and Development of a Real-time Detection Model for Portable Ladder and Safety Helmet (이동식사다리 중대재해 통계 분석 및 이동식사다리와 안전모 실시간 탐지 기계학습 모델 개발)

  • Choi, Seung-Ju;Jung, Kihyo
    • Journal of the Korea Safety Management & Science
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    • v.23 no.1
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    • pp.9-15
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    • 2021
  • The leading source of occupational fatalities is a portable ladder in Korea because it is widely used in industry as work platform. In order to reduce victims, it is necessary to establish preventive measures for the accidents caused by portable ladder. Therefore, this study statistically analyzed injury death by portable ladder for recent 10 years to investigate the accident characteristics. Next, to monitor wearing of safety helmet in real-time while working on a portable ladder, this study developed an object detection model based on the You Only Look Once(YOLO) architecture, which can accurately detect objects within a reasonable time. The model was trained on 6,023 images with/without ladders and safety helmets. The performance of the proposed detection model was 0.795 for F1 score and 0.843 for mean average precision. In addition, the proposed model processed at least 25 frames per second which make the model suitable for real-time application.