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목상해 분석을 위한 머신러닝 모델 개발 및 검증에 관한 연구
백세룡(Serong Baek),김천호(Cheonho Kim),김연우(Yeonwoo Kim),윤준규(Junkyu Yoon),임종한(Jonghan Lim) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6
최근 차량 능동안전장치가 빠르게 보급되고 있으며 그중 자동긴급제동장치(AEBS)는 충돌을 회피하거나 차량의 속도를 감속시켜 사고의 피해를 줄이는데 많은 도움이 되고 있다. 하지만 모든 운행 조건에서 사고를 피할 수 없기 때문에 피해를 경감하는데 주로 목적을 두고 있다. 따라서 최근 발생하는 추돌 사고는 다소 낮은 속도에서 충돌하는 경향이 나타난다. 저속으로 충돌하는 상황에서도 피 충돌 차량의 탑승자는 상해를 입을 수 있다. 일반적으로 저속 충돌의 경우 다른 신체 부위보다 목 상해 발생 확률이 높다. 목상해의 판단은 정지해 있던 피 추돌 차량의 충돌 수 속도변화로 추정할 수 있다. 일반적으로 차량의 속도 변화는 두 차량의 속도와 중량으로 계산할 수 있으나 두 차량 간에 충돌 자세와 차량의 형태 등에 따라 달라질 수 있다. 본 연구에서는 저속 후방 추돌 시험 데이터를 수집한 후 차량의 중량, 속도, 오프셋, 차량형태 등으로 분류한 후 머신러닝을 통해 모델을 만들었다. 모델은 K-fold 교차검증을 통해 학습하고 검증하였다. 학습에 사용된 데이터는 AGU(Die Arbeitsgruppe für Unfallmechanik) Zurich에서 수행된 254건의 저속충돌시험 데이터를 활용하였다. 모델의 정확도 판단을 위해 총 254 케이스 중 약 80%에 해당하는 204개의 케이스는 학습에 사용하고 나머지 50개의 케이스는 검증에 사용했다. 개발된 모델에 블랙박스, EDR, CCTV 등을 통해 얻은 차량의 충돌 전 속도를 적용하면 피 충돌 차량의 충돌 후 속도 변화를 예측할 수 있으며 그 결과로 목 상해 유무를 추정할 수 있다. 추후 사고분석을 통해 누적된 데이터를 활용한다면 기존의 안전장치를 보완하거나 새로운 안전장치를 개발하는데 활용하여 교통사고에서의 탑승자 부상을 줄이는데 기여할 수 있을 것으로 기대된다.
Kim, Soo-Chan,Yoon, Cheonho,Kim, Song-Chon 명지대학교자연과학연구소 1991 자연과학논문집 Vol.9 No.-
For the purpose of examining whether prostaglandins exist in plant materials. an attempt was made to develop an analytical method to extract and identify prostaglandins thexefrom. Prostaglandin extracts were obtained by a multistage solvent extraction, and they were separated and identified by TLC,HPLC and GC-MS. Main components of prostaglandins were efficiently extracted from the garlics and onions using a variety of complex solvents, In the TLC experiments, it was conformed that extracts of the garlics and onions contained the similar components to PGE₁ and PGA₁. HPLC chromatogram showed that PGE₁ in the garlics and onions existed in very larger quantities than PGA₁. Structure of PGE₁ was identified in the garlics by GC-MS in the MICI mode following the derivatization procedure of prostaglandins.
[기술논문]차량 전복사고에서 탑승자 거동에 대한 동적 해석모델 연구
백세룡(Seryong Baek),김천호(Cheonho Kim),조정권(Jeongkwon Cho),임종한(Jonghan Lim),윤준규(Junkyu Yoon) 한국자동차공학회 2017 한국 자동차공학회논문집 Vol.25 No.6
A vehicle rollover refers to a type of vehicle crash in which a vehicle rotates at least 90 degrees on the basis of its driving direction. Rollovers in South Korea are found to have a fatality rate 3.5 times higher than front collisions. This study analyzed the movements of a vehicle using PC-Crash and a passengers movements using MADYMO in order to analyze a passengers movements in the event of a vehicle rollover. Results of a test conducted under the dolly test conditions of FMVSS 208 after placing dummies on the drivers seat and the front passenger seat were compared with simulation. Regarding movements of the vehicle, data acquired by a sensor installed on the outside of the vehicle were compared with the results of simulation. As for the passengers movements, a video footage of the vehicle interior were compared with the results of simulation. PC-Crash and MADYMO use different coordinate systems. Owing to this issue, only two-dimensional passenger movements in a car crash can be analyzed. This study investigated methods for simulating the three-dimensional movements of a vehicle by linking the two programs. Results showed that when one free joint element was applied to D<SUB>x</SUB>, D<SUB>y</SUB> and D<SUB>z</SUB> for translation motion and R<SUB>y</SUB>, R<SUB>x</SUB> and R<SUB>z</SUB> were applied in sequence to three revolute joint elements for rotational motion, as methods for linking the dynamic behavior of PC-Crash to MADYMO, the movements of the two vehicles corresponded exactly with each other and the passengers movements also showed very similar forms.
김상길,윤천호 ( Sang Kil Kim,Cheonho Yoon ) 한국공업화학회 1998 공업화학 Vol.9 No.2
초음파분무 열분해에 의하여 유리 기판 위에 투명전도성 산화주석막을 증착하였다. 증착변수가 산화주석막의 전기저항, 광투과도, 결정구조 및 두께에 미치는 영향을 조사하였다. 증착시간과 염화주석(IV)의 농도가 증가함에 따라, 증착된 산화주석막의 전기저항과 가시선 및 근적외선 영역에서의 광투과도가 감소함을 보여주었다. 공기중에서 열처리온도가 증가하면, 증착된 산화주석막은 전기저항과 광투과도가 증가함을 나타냈다. 본 연구결과는 초음파분무열분해가 단일과정으로서 양질의 투명전도막을 효율적으로 제조할 수 있는 유망한 증착기술임을 암시한다. The transparent conducting tin oxide films were deposited on glass substrates by the ultrasonic spray pyrolysis. Examined were effects of deposition parameters on the electrical resistance, optical transmittance, crystal structure, and thickness of tin oxide films. As both the deposition time and concentration of tin(IV) chloride increase, the deposited tin oxide films exhibited the decrease of electrical resistance and optical transmittance in the visible and near infrared region. With increasing heat-treatment emperature in air, the deposited tin oxide films showed the enhanced electrical resistanceand optical transmittance. This study suggests that the ultrasonic spray pyrolysis may be a promising deposition technique effectively to prepare transparent conducting films of good quality in a single step.
김동완,백승화,윤천호 명지대학교 자연과학연구소 2006 자연과학논문집 Vol.25 No.-
Today many people stay a lot of time sitting on chair in their life. When a sitting posture is not correct, there is some trouble with the waist. And if it goes on long time, sometimes it may cause the hurts of waist or the deformded spinal column. A crouched posture is an obstacle to breath and it can give rise to drowsiness due to the lack of oxygen. Sitting posture is a habit so people can't feel it oneself and look over some kinds of risks. We analyzed conditions of muscles by measuring EMG of both sides of spinal bones. One can have a right sitting posture by analyzing the increasing muscle tension in one or the other side of muscles when the posture inclines on one side or ahead.
Suppression of edge localized mode crashes by multi-spectral non-axisymmetric fields in KSTAR
Kim, Jayhyun,Park, Gunyoung,Bae, Cheonho,Yoon, Siwoo,Han, Hyunsun,Yoo, Min-Gu,Park, Young-Seok,Ko, Won-Ha,Juhn, June-Woo,Na, Yong Su International Atomic Energy Agency 2017 Nuclear fusion Vol.57 No.2
<P>Among various edge localized mode (ELM) crash control methods, only non-axisymmetric magnetic perturbations (NAMPs) yield complete suppression of ELM crashes beyond their mitigation, and thus attract more attention than others. No other devices except KSTAR, DIII-D, and recently EAST have successfully achieved complete suppression with NAMPs. The underlying physics mechanisms of these successful ELM crash suppressions in a non-axisymmetric field environment, however, still remain uncertain. In this work, we investigate the ELM crash suppression characteristics of the KSTAR ELMy H-mode discharges in a controlled multi-spectral field environment, created by both <img ALIGN='MIDDLE' ALT='$n=2$ ' SRC='http://ej.iop.org/images/0029-5515/57/2/022001/nfaa3e05ieqn001.gif'/> middle reference and <img ALIGN='MIDDLE' ALT='$n=1$ ' SRC='http://ej.iop.org/images/0029-5515/57/2/022001/nfaa3e05ieqn002.gif'/> top/bottom proxy in-vessel control coils. Interestingly, the attempts have produced a set of contradictory findings, one expected (ELM crash suppression enhancement with the addition of <I>n</I> = 1 to the <I>n</I> = 2 field at relatively low heating discharges) and another unexpected (ELM crash suppression degradation at relatively high heating discharges) from the earlier findings in DIII-D. This contradiction indicates the dependence of the ELM crash suppression characteristics on the heating level and the associated kink-like plasma responses. Preliminary linear resistive MHD plasma response simulation shows the unexpected suppression performance degradation to be likely caused by the dominance of kink-like plasma responses over the island gap-filling effects.</P>