호주 신차안전도평가의 하부다리 상해치 개선을 위한 경차의 Footrest 형상 최적화

김요셉,이만수,남정인,한재녕,Kim, Joseph,Lee, Mansu,Nam, Joungin,Han, Jaenyung 한국자동차안전학회 2015 자동차안전학회지 Vol.7 No.1

In order to protect occupant during car crash accident, Regulation and NCAP(New Car assessment Program) have been developed among various countries like U.S.A., Europe, Korea and Australia. Especially NCAP scores affect to sales of vehicles. So vehicle makers are trying to get good score in NCAP. Low leg injuries play an important role in Australia and Euro NCAP and these injuries are related with footrest design. Optimization of footrest design in early stage of vehicle development is necessary to obtain better and robust results of low legs during crash tests. In this paper, DFSS method and finite element model were used to optimize the low leg performance in small RHD vehicles. Compared with the lower leg injury of base model, the lower leg injury of proposed model was slightly improved and robustness was enhanced also.

People Interview: 유진녕 LG화학기술연구원 원장 - 'NIH 신드롬'을 깨다${\cdots}$ "우린 2000명 연구원이 협업"

김요셉,Kim, Joseph 한국과학기술단체총연합회 2013 과학과 기술 Vol.527 No.-

정면 모의충돌시험에서 운전자 흉부가속도 유형에 따른 조향핸들과의 흉부접촉에 대한 연구

김요셉(Joseph Kim),임경호(Kyung-ho Lim),범현균(Hyen-kyun Beom),권성은(Sung-eun Kwon) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

The increasing number of vehicles has given rise to frequent traffic accidents. The safety become one of the most important factor for customers to purchase a car. To meet customers' needs, NCAP(New Car Assessment Program) test is performed in many country such as US, Korea, and Europe. EuroNCAP performance becomes important to Korean car makers as the number of exporting vehicle to Europe market increases. The assessment of EuroNCAP frontal crash test includes the criteria of dummy injuries, vehicle measurements of deformation and the subjective modifier. Among the subjective modifier. the Chest Contact Modifier is one of the most ambiguous modifier because of difficulties in getting sufficient clues. In this paper, sled test was carried out using KNCAP full frontal crash pulse to analyze shape patterns of chest acceleration pulse which is one of the information of chest contact modifier. The test result was showed that four patterns of obscure pulse shape in vehicle crash test were categorized and these pulse patterns were clearly revealed to be occurring chest contact or not.

FWDB 정면충돌시험에 대한 연구

김요셉(Joseph Kim),범현균(Hyenkyun Beom) 한국자동차공학회 2010 한국 자동차공학회논문집 Vol.18 No.6

In proportion to increasing interest in vehicle safety, many country have regulated vehicle safety and performed NCAP(New Car Assessment Program). However vehicles which had good results in these compliance and NCAP frontal crash test have caused problems such as the fork effect and over-riding in real car-to-car accidents. To complement these issues, new frontal crash test modes using new barrier like FWDB and PDB have been developed by EEVC WG15. In this paper, FWDB frontal crash test was performed and the result was compared with the full frontal crash test using the rigid wall in order to comprehend the characteristic of FWDB. The results of FWDB test were compared with one of USNCAP and KNCAP. Using USNCAP data, vehicle performance like deformation and wall force were studied. A comparative study of dummy injuries was made by using KNCAP result. The results showed that vehicle performance of FWDB test like displacement and effective acceleration was similar in spite of absorbing energy of FWDB due to the greater vehicle deformation of rigid wall test. In FWDB test, driver dummy head bottomed out but most of injuries were superior to the injury of rigid wall test.

EuroNCAP 정면충돌 시험의 신뢰성 분석

김요셉(Joseph Kim),범현균(Hyenkyun Beom),권성은(Sungeun Kwon),남창훈(Changhoon Nam) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4

Numerical simulation has played an important role in the vehicle development. Especially vehicle crash numerical simulations have been indispensable more and more in order to save the developing time and cost. However numerical simulation are usually deterministic. Crash tests results have scatter due to many variables such as manufactory condition of vehicle, test condition, margin for test procedures, slight deference of restraint system performance and so on. In order to consider these varieties under test situation, CAE based stochastic analysis has performed. In this paper, stochastic numerical simulations are carried out using MADYMO and ADVISER to investigate the variance of frontal EuroNCAP test results. In addition, influence of parameters on the result of frontal EuroNCAP tests are analyzed using stochastic post-processing tools. The results showed that EuroNCAP point varied from 9.7 to 11.1 according to calculation conditions and these value of bandwidth was 12 % of maximum point. In two cases, head bottoming out occurred.

DFSS를 통한 측면충돌센서 위치 최적화

김요셉(Joseph Kim),고유석(Yuseok Ko),선주형(Juhyoung Sun),윤나영(Nayoung Yoon),조기순(Kisoon Cho) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5

As the number of vehicles is increasing, the number of accidents is also increasing. Recently, customers are requiring safer vehicles, so vehicle makers are equipping not only the frontal airbags but also side airbags. Many countries regulate the vehicles safety and develop the NCAP with more severe criteria. To meet these customer requirements and NCAP criteria, it is important to deploy the airbags properly. Side crash sensors are needed to deploy the side airbags. In this study, the method for selecting the robust position of crash sensors at C-pillar was proposed using DFSS methods. First, 4 points were selected with consideration of other parts like holes and harness. Then CAEs with various MDB were performed and get acceleration data from selected points. Each pulses were scaled with ±10% and velocities of each pulse were calculated. From theses velocity, The time when the velocity crossed threshold was used for TTF(Time to Fire). Because faster times of airbag deployment were usually required, DFSS was performed as ‘smaller the better’ criteria. The selected point was verified with 2nd row pole test. In conclusion, response of C-pillar acceleration sensors were better than acceleration from B-pillar sensor and robust position could be selected with this DFSS method.

망막전막제거술의 수술 어려움 예측

김요셉(Joseph Kim),이준섭(Jun Seob Lee),진희승(Hee Seung Chin) 대한안과학회 2021 대한안과학회지 Vol.62 No.6

목적: 망막전막의 수술 전 특성을 분석하여 망막전막제거술의 수술 어려움을 예측하고자 하였다. 대상과 방법: 2016년부터 2020년까지 특발성 망막전막으로 진단받고 망막전막제거술을 시행받은 75명의 환자를 대상으로 비디오 분석을 통해 수술 시간을 측정한 후 수술 전 칼라안저사진 소견(망막전막의 혼탁, 망막주름, 혈관구불거림), 빛간섭단층촬영 소견(망막전막 단계[stage], 망막전막과 내경계막 사이의 섬유성 변화)과의 연관성을 평가하였다. 결과: 수술 시간과 관련된 요인은 혈관구불거림, 망막전막 단계, 섬유성 변화였다(p=0.024, p=0.020, p=0.018). 더미회귀분석을 통해 망막전막 4단계, 혈관구불거림 2단계(보통) 이상 존재할 때 수술 시간이 증가하는 것으로 확인되었다(p=0.036, p=0.049). 결론: 수술 전 검사에서 망막전막 4단계, 혈관구불거림이 2단계(보통) 이상일 때는 수술이 어려울 가능성이 있으므로 망막수술 초심자의 경우에는 수술 환자 선택 시 고려해야 할 것으로 판단한다. Purpose: We sought to predict how difficult surgical removal of an epiretinal membrane (ERM) might be by analyzing the preoperative characteristics of the ERM. Methods: From 2016 to 2020, 75 patients diagnosed with idiopathic ERMs who underwent ERM removal were evaluated in terms of surgical time (via video analysis); associations between that time and preoperative color fundus photographs and optical coherence tomography findings were sought. Results: The surgical time was associated with the vascular tortuosity grade, the ERM stage, and fibrillary changes (p = 0.024, p = 0.020, and p = 0.018). Dummy regression analysis showed that EMR stage 4, and vascular tortuosity grades of 2 or 3, increased the surgical time (p = 0.036, p = 0.049). Conclusions: Surgery may be difficult if the ERM is of stage 4 or the vascular tortuosity grade 2 or more. A retinal surgery novice should consider these factors when contemplating surgery.

계층분석법(AHP)을 이용한 어린이보호구역 지정기준에 관한 연구

김요셉(Kim, Joseph),박태훈(Park, Tae-Hun),박제진(Park, Je-Jin),하태준(Ha, Tae-Jun) 대한교통학회 2008 대한교통학회 학술대회지 Vol.59 No.-

승객감지센서 성능 비교 연구

김요셉(Joseph Kim),윤나영(Nayoung Yoon),이재우(Jaewoo Lee),조기순(Kisoon Cho) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5

Airbags have improved the performance of adults occupant safety. However children who sit in front passenger seats have got fatal injuries. Due to this risk of airbags to children, National Highway Transportation and Safety Administration has made vehicles equipped with Automatic Suppression Systems. These systems detect the passenger status such as adults, children and CRS. Using this information of passenger status, Sensing & Diagnosis Module makes decision whether passenger front airbag is suppressed or deployed. In this paper, Performance and qualities of two types of passenger sensing systems were compared. One uses pattern recognition system and the other uses weight recognition system. Pattern recognition system uses pressure distribution pattern of occupant and weight recognition system uses weight of occupant to classify the occupants. In this research, Sensors of pattern recognition system were located on top of cushion but sensors of weight recognition system were behind cushion foam. In order to measure the performance, correct decision ratio of 5th%ile was used and quality index was used for defining the qualities. The results showed that average correct decision ratio of pattern recognition system and weight base system were 98.84% and 98.52% respectively. Both systems had good performance but positions of 5th%ile which have incorrect decision were different. In order to compare the quality, quality index was used. Quality index was measured by the incidents ratio from fields. When this index of pattern recognition system is 100%, the index of weight recognition system was 40%. Both systems had good enough qualities but weight recognition system was better because it seemed that sensor location of weight recognition system is under cushion of seats.

선천코눈물관막힘 환아에서 실리콘관 조기 이탈의 임상 결과

김요셉(Joseph Kim),강성모(Sung Mo Kang) 대한안과학회 2018 대한안과학회지 Vol.59 No.5

목적: 실리콘관삽입술을 시행한 선천코눈물관막힘 환아에서 실리콘관 조기 이탈이 수술 성공률에 미치는 영향을 알아보고자 하였다. 대상과 방법: 선천코눈물관막힘으로 실리콘관삽입술을 시행한 환아 27명(40안)을 대상으로 하였다. 실리콘관은 3개월 유지 후 제거하는 것을 목표로 하였으며, 유지 기간의 2/3 기간 이내에 이탈된 경우를 조기 이탈로 정의하였다. 수술 성공 여부는 최소 1년간의 추적 관찰기간 동안 지속적인 눈물흘림이 없는 경우로 정의하였다. Fischer s exact test 통계 기법을 이용하여 실리콘관 조기 이탈이 있는 환자군과 조기 이탈이 없는 환자군의 수술 성공률을 평가하였다. 수술 방법에 있어서는 코내시경을 통한 단계적 탐침술과 실리콘관삽 입술을 동시에 시행하여 이전 연구들과는 차이를 두었다. 결과: 실리콘관삽입술의 전체적인 성공률은 95% (38안/40안)였으며, 실리콘관 조기 이탈은 수술 성공률에 영향을 미치지 않았다 (p=0.154). 조기 이탈은 40% (16안)에서 발생하였으며, 술 후 7일 이내가 12% (2안), 8-14일 이내가 44% (7안), 15-30일 이내가 19% (3안), 31일 이상이 25% (4안)였다. 결론: 선천코눈물관막힘에서 실리콘관 조기 이탈은 수술 성공률에 영향을 미치지 않았으며, 조기 이탈이 흔한 영유아에서 내시경적 단계적 탐침술과 실리콘관삽입술을 병행하는 것은 기능적으로 보다 높은 치료 성공률을 얻을 수 있을 것으로 판단된다. <대한안과학회지 2018;59(5):393-396> Purpose: To investigate the surgical results of early silicone tube displacement in congenital nasolacrimal duct obstruction. Methods: A total of 40 eyes from 27 children who received silicone tube intubation with sequential probing under intranasal endoscopic guidance were enrolled in this retrospective study. The silicone tube was intended to be removed after 3 months, and was defined as early displacement if the tube was removed within 2/3 of the planned tube retention time. Success was defined as the absence of persistent epiphora for at least a 1-year follow-up period. Using Fisher s exact test, the success rate of patients with and without early tube displacement was compared for a statistical difference. Results: Overall, 95% (38/40) of eyes were treated successfully; they were not affected by early tube displacement (p = 0.154). Early displacement occurred in 40% (16/40) of eyes: 12% (2) within 7 days, 44% (7) within 8–14 days, 19% (3) within 15–30 days, and 25% (4) after 31 days. Conclusions: In congenital nasolacrimal duct obstruction, early silicone tube displacement did not affect the clinical outcome of silicone tube intubation. Therefore, endoscopic-guided silicone tube intubation with sequential probing may provide a high functional success rate although early tube displacement occurs in young children. J Korean Ophthalmol Soc 2018;59(5):393-396