• Transactions of the Korean Society of Automotive Engineers
• /
• v.20 no.2
• /
• pp.64-69
• /
• 2012

Head injury is one of the most common cause of deaths in car-to-pedestrian collisions. To reduce the severity of such injuries, many international safety committees have performed headform impact test for pedestrian protection. In this paper, an adult headform impactor model is developed based on the finite element (FE) method and validated through the numerical simulation. The skin material of headform impactor is known as polyvinyl chloride skin (PVC) and its material was assumed as viscoelastic. The viscoelastic parameters of headform skin are identified by a series of trial and error methods. The new developed FE adult headform impactor is verified by the drop test and FE JARI adult headform impactor provided by Madymo program.

• Annual Conference on Human and Language Technology
• /
• 1999.10e
• /
• pp.265-271
• /
• 1999

이 논문은 한국어 관계관형절(relative adnominal clause)의 전산처리에 적합한 통사 의미 표상 모형을 제시하고, 그 결과를 전산적 구현을 통해서 검증하는 것이 목적이다. 이를 위해 이 논문에서는 다음의 두 가지 문제를 중심으로 관계관형절의 통사 의미 표상과 전산적 구현 문제를 다룬다. 첫째, 관계관형절의 수식을 받는 머리 명사(head noun)는 관계관형절과 모문(matrix sentence)에서 각각 다른 의미역할을 하는 논항이다. 즉, 하나의 논항이 두 개의 의미역을 표상한다. 이 논문의 첫째 과제는 이러한 관계관형절 구문에서 머리 명사의 이중의미역을 표상하는 방법을 모색하는 것이다. 둘째, 관계관형절이 일항술어로 구성될 때, 서술어 단독으로 머리 명사를 수식할 수 있을 뿐만 아니라, 주격중출 구문을 관계화하여 미리 명사를 수식할 수도 있다. 그러나 모든 일항술어가 주격중출 구문을 구성할 수 있는 것은 아니기 때문에 주격중출 구문의 관계화가 가능한 경우와 그렇지 않은 경우를 구별할 필요가 있다. 이 논문의 둘째 과제는 이러한 주격중출 구문의 관계화와 그 표상의 문제를 다루는 것이다. 이 논문에서는 이러한 문제들을 단순히 기술하는 데 그치지 않고 전산 구현을 통해 문제해결을 제시한다. 이를 위해 구현 도구로 C-언어를 보강하여 개발한 문법개발 도구언어인 말라가(Malaga)를 사용하며, 분석결과를 자질구조(feature structure)로 명시하여 그 타당성을 검토한다.

• Journal of the Korean Society of Manufacturing Process Engineers
• /
• v.5 no.4
• /
• pp.53-58
• /
• 2006

IHRA Pedestrian Working Group has investigated and analyzed the current status of pedestrian-vehicle accidents in IHRA member countries. According to the results, European countries and Japan are working on new regulations to improve passive pedestrian protection on passenger cars significantly. Although IHRA proposed pedestrian test procedures, which may provide a basis of technical regulations in the future, further research and development are necessary to refine the procedures. In order to prepare and satisfy the pedestrian protection requirements, domestic passenger vehicles also should be tested. Among various safety-related studies based on accident data analysis, dealing with pedestrian head injury would be considered one of the keen interests. In this study, the pedestrian headform impact test system is developed. The developed system will be useful to carry out validation study of the test procedures through actual tests using sample vehicles, and to explore the car feasibility level prior to the use of the test methods in legislation.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.15 no.1
• /
• pp.106-115
• /
• 2007

In this study, first, child headform model was built up, satisfying requirement in the headform validation test. Also, for decreasing both acceleration peak and deformation, a new hood with dome shaped forming in inner panel was investigated. Next, headform impact, complying with draft of EEVC W/G 17, on the central portion of the newly proposed hood were simulated for a steel hood and three aluminum hoods with different thickness for examining the material and thickness effect on HIC value and inner panel deformation. The analysis results explained that aluminum hoods with dome shaped forming in inner panel were highly promising not only for meeting headform safety regulations but also for leading to weight savings. Finally, hood edge design technology in order to reduce pedestrian injury due to the high stiffness of beam type edge and the rigid support, was discussed. Various types of the foam filled edge were designed and their headform safety performance were evaluated. The edge structure with foam filled in upper one third of section exhibited excellent results.

• Journal of the Korean Geotechnical Society
• /
• v.21 no.2
• /
• pp.105-111
• /
• 2005

Shaking table tests are performed to investigate the seismic behavior of the batter pile and to bring up the countermeasures to improve the seismic performance of the batter pile. First of all, this study demonstrates how batter piles and vertical piles behave under static lateral loadings. Secondly, the vulnerability of batter plies under dynamic lateral loadings is demonstrated showing the axial forces and bending moments mobilized at the pile heads during shaking table tests. Thirdly, countermeasures to overcome the vulnerability of behavior piles during earthquakes are pursued. The countermeasures investigated in this study include introduction of a rubber element at the pile head and the deck plate connection, and introduction of hinge connection. Finally, the slope of batter piles which induces the minimum pile forces during the dynamic loadings are investigated and found to be 8:3 (Vertical to Horizontal).

• Transactions of the Korean Society of Automotive Engineers
• /
• v.18 no.5
• /
• pp.20-24
• /
• 2010

The position of the automobile's head restraint is very important for the neck injury in rear end collision. This study is about influence of the head restraint height and distance on neck injury during rear end collision. The effects of the position have been evaluated experimentally. The neck injuries are calculated by the relative acceleration between the upper and lower neck. As a result, It is found that the head restraint should be close enough to the back of the head and high enough to the top of the head.

• Proceedings of the Korean Fiber Society Conference
• /
• 2003.10b
• /
• pp.243-244
• /
• 2003

계면활성제는 모터오일, 제약, 비누, 세제 등의 용도가 다양한 화학 제품 중 하나이다. 계면활성제는 비극성의 긴 탄화수소 체인으로 이루어진 꼬리(tail)부분과 보통은 이온으로 이루어진 극성을 띄는 머리(head)부분으로 구성되어있다. 보통 계면활성제를 나타낼 때는 fig. 1의 성냥개비와 같은 모형으로 표시하는 경우가 많다. 머리부분이 친수기를 나타내고, 꼬리부분이 친유기를 나타낸다. (1-2) 물과 같은 극성용매에서, 친수성과 친유성의 두 가지의 특징을 동시에 가지고 있는 계면활성제는 미셀(micelle)이라고 알려진 정리된 분자 화합이 일어난다.[3] (중략)

• Journal of the Korean GEO-environmental Society
• /
• v.8 no.2
• /
• pp.19-27
• /
• 2007

In this study, the centrifugal tests were performed with varying the angle of slope such as 1:3, 1:2.5, and 1:2 in order to analyze the deformation and failure type of dredged clay slope for a short term. The displacement mode, displacement vector and the variation of pore pressure with the different slope angle were measured. As a results, even though the displacement in the slope after 4 months were developed in the case of 1:3 for the dredged slope, there are little problems to obtain the stability of dredged slope because the original construction section maintains. Also, in the case of 1:2.5 after 4 months the local slope failure occurred and in the case of 1:2 after 2 months the circle failure starting from the point of the tensile crack occurred. After reviewing the results, the maximum vertical displacement occurred at the crest of slope and maximum horizontal displacement was about double of maximum vertical displacement.

• Journal of Industrial Convergence
• /
• v.19 no.4
• /
• pp.1-8
• /
• 2021

This study was conducted with the aim of developing a mobile app so that parents and children can provide questions and conversation-based Home Humanity Education. App development was developed in four stages: analysis, design, development, and evaluation by modifying the ADDIE model. In the analysis stage, education goals were set and seven core competencies were extracted for the app. In the design stage, 15 menus, including character to implement seven core competencies, were selected for learning contents. In the development stage, questions were asked based on 1,000 photos, and parents and children naturally talked to strengthen their core competencies. In the evaluation stage, the user's evaluation interview was followed by a reflux process that produced and reflected improvements. Based on research results, it is going to suggest follow-up research on developing apps for home humanity education. First, it is necessary to verify the learning experiences and changes that occur when parents and children use apps for a long time through longitudinal research. Second, a follow-up study is needed on how to use the home humanity education app by age and how to improve it accordingly. Third, as the number of cases in which grandparents raise their grandchildren increases, it is necessary to study the process and learning effects of grandparents and grandchildren using the app.

• Proceedings of the Korean Operations and Management Science Society Conference
• /
• 1997.10a
• /
• pp.37-40
• /
• 1997

RP(Rapid Prototyping) 기술은 점점 그 활용범위를 넓혀가는 추세이며, 의료분야에서도 임플란트의 제작등에 RP 기술의 도입이 시도되고 있다. 뼈나 치아 등의 인체부속물들은 속성상 직접 그 형태를 파악하기가 힘들고, 따라서 그 대체물인 임플란트의 제작을 위해 MRI나 CT등의 장비가 사용되고 있다. 의료분야에까지 이르는 RP의 활발한 활용에도 불구하고, 아직 국내에서는 RP에 대한 인식이 부족하고 그 활용에 대한 연구가 거의 없는 상황이다. 본 논문은 MRI, CT등의 2차원 평면데이터로부터 직접 RP 기계의 표준입력화일인 STL 파일을 생성시키기 위한 방법을 제시한다. 그리고 MRI로 스캐닝된 사람의 머리뼈 형상을 삼각메쉬 형태의 STL 파일로 변화하여 RP 기계를 통한 실물 모형 제작이 가능하도록 한 예를 설명하였다.