• Title, Summary, Keyword: Helmet

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An Analysis of the Types of Panoplies in the TV Dramas Yeongaesomun and Taewangsasin-gi - Focusing on the Panoplies of the Goguryeo Dynasty - (TV 사극 연개소문과 태왕사신기에 표현된 갑주유형 분석 - 고구려시대 갑주를 중심으로 -)

  • Cho, Mi-Suk;Kim, Eun-Jung
    • Journal of the Korean Society of Costume
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    • v.60 no.5
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    • pp.35-50
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    • 2010
  • The purpose of this study was to know how helmet and armor was reinterpreted in historical play by considering general concept and type of old helmet and armor from the aspect of costume history and comparing the helmet and armor types of TV historical plays, Yeongaesomun and Taewangsasingi, whose historical backgrounds were based on the age of Goguryeo. The helmet and armor type shown in Yeongaesomun was reinterpreted as the one, which is close to historical investigation, by reappearing lamellar armor and jongjangpanju(helmet made of slim, long plate) shown in Goguryeo wall painting. The helmet and armor type shown in Taewangsasingi expresses fantastic helmet and armor by adding fantastic factor regardless of historical investigation. The study result reveals that there are several common characteristic factors between the helmet and armors of two historical plays. First, there was a classification in the display of character and story. The helmet and armor type shown in Yeongaesomun classified color and detail design depending on lamellar armor or character. In Taewangsasingi, the helmet and armor was manufactured depending on character's nature and the chain armors, which are lighter than existing helmet and armors, were usual. Second, they escaped from the historical investigation about traditional helmet and armor. In Yeongaesomun, myeonggwangae(a type of armor), which might be popular, was not expressed and Taewangsasingi is free from an imperative idea of historical investigation by manufacturing helmet and armor referring to that of ancient Rome age. The modern sense was reflected to increase dramatic effect. The helmet and armor of Yeongaesomun provides modern feeling by using stainless steel material and modern color arrangement and that of Taewangsasingi is designed in modern, splendid way as it aimed at game development from the planning step.

A study on the needs for the cool motorcycle helmet and the factors affecting the purchasing intention (오토바이용 쿨 헬멧의 필요성과 구매요인에 관한 조사연구)

  • Seong, Deokhyun;Kim, Jongsoo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.16 no.12
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    • pp.8386-8393
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    • 2015
  • This study is to investigate the needs for the cool motorcycle helmet and the factors affecting the purchasing intention of cool helmet. The convenient sampling from motorcycle clubs were conducted during 5/20/2014~5/28/2014 on Google DAX. As a result, 197 participants were surveyed. The main reasons of sensing unpleasant feeling wearing helmet were identified as 'hot and uncomfortable feeling' and 'it ruins hair style'. The mean score expressed in terms of five point scale showed that the needs for cool helmet was 3.9 and the purchasing intention of cool helmet was 3.6, respectively. The significant factors influencing the purchasing intention of cool helmet were identified as 'the needs for cool helmet' (odds ratio=6.52) and 'extra paying intention for cool helmet' (odds ratio=1.77). The main reasons of sensing unpleasant feeling wearing helmet were similar to the previous research. However, we can expect that the initial target market for cool helmet would be the low end (less than \40,000 of extra paying intention) or the high end (more than \100,000 of extra paying intention). The main contribution of this study is dealing with the topics related to the purchasing intention of the cool helmet.

A Study on the Characteristic of the Helmet and Armor in the Early Days of the Joseon Dynasty Appearing in TV Historical Drama - Focusing on the Tear of Dragon and King Sejong - (TV 사극 드라마에 나타난 조선전기 갑주의 특성에 관한 연구 - 용의 눈물과 대왕세종을 중심으로 -)

  • Kim, Eun-Jung;Cho, Mi-Suk
    • Journal of the Korean Society of Costume
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    • v.61 no.2
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    • pp.32-46
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    • 2011
  • The study researched the characteristic of helmet and armor reflecting Joseon Dynasty by focusing on the helmet and armor appearing in dramas, the Tear of Dragon and King Sejong, whose common point is the historical background, the early Joseon Dynasty, among the historical dramas, which are manufactured on the basis of historical person or age. First, the helmet and armor appearing in historical drama was reproduced on the basis of historical record depending on age. In the early Joseon Dynasty, helmet was classified into cheomju and wonju and armor was classified into chalgap, swaejagap, gyeongbeongap, dujeonggap and dudumigap. In drama, the Tear of Dragon and King Sejong, for helmet, cheomju and wonju were used and for armor, chalgap, dujeonggap and dudumigap, whose type and manufacture method were similar to that of historical record, were reproduced. Second, the helmet and armor appearing in historical drama searched for function. In drama, the Tear of Dragon, rather than heavy iron, plastic and textile were used and the metal scale inside armor was removed. In drama, King Sejong, the weight of armor was decreased by removing the metal scale inside armor and easy wearing was secured by using velcro. Third, the helmet and armor appearing in historical drama expressed various dramatic interpretations. In drama, the Tear of Dragon, the same color as that of armor was adopted for helmet to provide stable and unified feeling. Visually splendid display was added to armor by matching powerful prime color and glossy metal. In drama, King Sejong, modem sense was added to helmet and armor by actively using pastel color reflecting modem fashion.

Design and Evaluation of Intelligent Helmet Display System (지능형 헬멧시현시스템 설계 및 시험평가)

  • Hwang, Sang-Hyun
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.45 no.5
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    • pp.417-428
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    • 2017
  • In this paper, we describe the architectural design, unit component hardware design and core software design(Helmet Pose Tracking Software and Terrain Elevation Data Correction Software) of IHDS(Intelligent Helmet Display System), and describe the results of unit test and integration test. According to the trend of the latest helmet display system, the specifications which includes 3D map display, FLIR(Forward Looking Infra-Red) display, hybrid helmet pose tracking, visor reflection type of binocular optical system, NVC(Night Vision Camera) display, lightweight composite helmet shell were applied to the design. Especially, we proposed unique design concepts such as the automatic correction of altitude error of 3D map data, high precision image registration, multi-color lighting optical system, transmissive image emitting surface using diffraction optical element, tracking camera minimizing latency time of helmet pose estimation and air pockets for helmet fixation on head. After completing the prototype of all system components, unit tests and system integration tests were performed to verify the functions and performance.

A Study on the Shock Absorption Performance of the Safety Helmet using Coefficient of Restitution (반발계수를 이용한 안전모의 충격 흡수 성능에 관한 연구)

  • Shin, Woon-Chul
    • Journal of the Korean Society of Safety
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    • v.27 no.5
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    • pp.30-34
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    • 2012
  • A safety helmet is a personal protective equipment to protect the head from falling and flying objects. A safety helmet has the maximum delivered impact force as shock absorption performance, the lower delivered impact force the better performance, which was not a controlled variety during manufacturing safety helmet. Accordingly there were some difficulties in establishing the standard for improved performance as there was not a clear controllable impact force for improved performance. In this study the shock absorption performance was intended to be found as coefficient of restitution related to impulse. As a research method, a coefficient of restitution during the absorption of shock was calculated using the impulse transferred to pharynx utilizing the safety helmet shock absorption performance testing device based on the theory of momentum and impulse. The estimated impulsive force curve was derived assuming that shock was not absorbed using the measured data. The sample was selected as tested goods of ABS material for safety certification available mainly in the market. As a result of study, the maximum delivered impact force of safety helmet made by a domestic safety certified a company was 735 N, and its coefficient of restitution proved to be 0.64. The smaller coefficient of restitution is, the lower maximum delivered impact force and the higher shock absorption performance. The coefficient of restitution can be used as a performance index of safety helmet.

Outcome Analysis of Cranial Molding Therapy in Nonsynostotic Plagiocephaly

  • Yoo, Han-Su;Rah, Dong Kyun;Kim, Yong Oock
    • Archives of Plastic Surgery
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    • v.39 no.4
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    • pp.338-344
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    • 2012
  • Background It is known that nonsynostotic plagiocephaly does not spontaneously improve, and the craniofacial deformities that result from it. This study was conducted to analyze the effectiveness of helmet therapy for the nonsynostotic plagiocephaly patient, and to suggest a new treatment strategy based on this analysis. Methods A total of 108 pediatric patients who had undergone helmet therapy after being diagnosed with nonsynostotic plagiocephaly were included in this study. The patients were classified according to the initiation age of the helmet therapy, severity, and helmet wearing time. The treatment effect was compared using cranial vault asymmetry (CVA) and the cranial vault asymmetry index (CVAI), which were obtained from diagonal measurements before and after therapy. Results The discrepancy of CVA and CVAI of all the patients significantly decreased after helmet therapy. According to the initiation time of helmet therapy, the treatment effect was best at 5 months old or less. The helmet wearing time per day was proportional to the treatment effect up to 20 hours. In addition, the rate of the successful treatment (final CVA ${\leq}$ 5 mm) significantly decreased when the initiation age was 9.1 months or older and the treatment period was less than 7.83 months. Conclusions This study showed the effectiveness of the helmet therapy for nonsynostotic plagiocephaly patients. Based on analysis of this study, helmet therapy should be started at the age of 9 months or younger for 7.83 months or more, and the helmet wearing time should be more than 20 hours a day.

The Research on the Development of Passenger Helmet to Prevent Head Trauma (두부 손상 보호를 위한 승객용 헬멧 개발 연구)

  • Lim, Jeong-Ku;Kweon, Ghi-Sun;Dodge, Robin E.
    • Journal of the Korean Society for Aviation and Aeronautics
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    • v.18 no.1
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    • pp.58-63
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    • 2010
  • Introduction : Head trauma is the main cause of death in aircraft crash. In a Michigan study of structurally survivable, fatal accidents, 80% of the fatally injured had received head trauma. We tried to develop a new helmet for passengers, and perform its efficiency test. Methods : An aircraft helmet requires an excellent protection against head trauma, lightness, and small volumes. In addition, it must be wearable, fire resistant, and non toxic when it is burning. We developed two new helmets made from silicone foam which met all theses requirements. One was thin (2.5cm), and the other was thick (6.3cm). These looked like a motorcycle helmet and had only a soft silicone as liner material without an outer hard shell. Therefore we can carry them easily inside aircrafts. The standard test for helmet is Snell's drop test. It measures the impact acceleration of head shaped metal wearing helmet during we drop it at certain heights. Impact sites were total 5 sites (front, back, right, left and top) for each helmet. All these sites were impacted twice. Results : The thickness of impact sites varied from 2.5cm to 6.3cm. The impact acceleration of 2.5cm thickness site when it was dropped from 1.0 meter was 379g. But, that of 6.3cm thickness site when it was dropped from 1.5 meter was only 163g. Unfortunately, both helmets didn't meet the Snell Standard for motorcycle helmets. Discussion : If we add suitable outer hard shell, and change its thickness and design, the efficiency will be increased. A study indicated that helmet could reduce the risk of head trauma up to 85%. We made helmet for passengers in aircraft crash for the first time. If we improve its weak points, it will decrease the frequency of head trauma in aircraft craft.

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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    • 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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Motion and Structure Estimation Using Fusion of Inertial and Vision Data for Helmet Tracker

  • Heo, Se-Jong;Shin, Ok-Shik;Park, Chan-Gook
    • International Journal of Aeronautical and Space Sciences
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    • v.11 no.1
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    • pp.31-40
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    • 2010
  • For weapon cueing and Head-Mounted Display (HMD), it is essential to continuously estimate the motion of the helmet. The problem of estimating and predicting the position and orientation of the helmet is approached by fusing measurements from inertial sensors and stereo vision system. The sensor fusion approach in this paper is based on nonlinear filtering, especially expended Kalman filter(EKF). To reduce the computation time and improve the performance in vision processing, we separate the structure estimation and motion estimation. The structure estimation tracks the features which are the part of helmet model structure in the scene and the motion estimation filter estimates the position and orientation of the helmet. This algorithm is tested with using synthetic and real data. And the results show that the result of sensor fusion is successful.

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
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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.