보행자와 승용차의 충돌 위치에 따른 전도거리 패턴 분석

권선민,장현봉 한국ITS학회 2017 한국ITS학회논문지 Vol.16 No.1

보행자와 승용차의 충돌위치에 따른 전도 거리 변화를 madymo-시뮬레이션을 통하여 분석하였다. 충돌위치를 차량중심으로부터 바깥쪽으로 2.5cm간격마다 충돌하는 경우에 대하여시뮬레이션하였다. 그 결과 보행자의 전도거리형태가 급격히 변화하는 임계점이 두 곳에서나타났다. 첫 번째 임계점은 보행자의 어깨가 차량과 접촉되지 않는 위치였다. 두 번째 임계점의 위치는 보행자의 무게중심이 차체의 외곽선상을 벗어나기 직전의 위치였다. 첫째 임계점과 두 번째 임계점의 사이 구간에서는 충돌위치가 차량의 바깥쪽에 가까울수록 전도거리는 급격히 감소하였다. 두 임계점 사이를 벗어난 구간에서는 전도거리 변화가 크지 않은 것으로 나타났다. 충돌위치에 따른 전도거리 변화가 밝혀져서 보다 정확한 교통안전 분석과 보행자 사고해석이 가능해질 것으로 판단된다. This paper investigates pedestrian-thrown distance pattern by pedestrian-vehicle collision position by madymo-simulation. The simulation were performed for every 2.5 cm interval between center and edge of bumper for various vehicle speeds and vehicle shapes. As a result, two critical points where thrown distance change rapidly were found. First critical point locate where pedestrian’s shoulder do not contact the vehicle. Second point locate where the center of gravity of pedestrian are close to edge of bumper. Between 1st and 2nd critical points, thrown distance decrease rapidly where collision points move to the edge of vehicle. In other cases, the thrown distance does not change rapidly. This result gives more accurate guideline for pedestrian collision in traffic safety.

승용차와 보행자간의 사고에서 충돌위치에 따른 전도형태 분석

권선민,성경진 대한교통학회 2015 대한교통학회 학술대회지 Vol.73 No.-

승용차량의 앞부분 중앙에 보행자가 충돌이 되었을 경우 승용차의 속도에 따른 전도거리변화에 대해서는 많은 연구결과가 있으나, 중앙이 아닌 부분에 충돌이 되었을 경우의 변화에 대하여서는 알려진 실험결과가 없어 Madymo-시뮬레이션을 통하여 전도되는 거리와 방향의 변화를 알아 보았다. 차체중심에서 60cm 떨어진 전조등부분 보다 안쪽에 보행자가 충돌되었을 경우 종방향 전도거리는 거의 변화가 없었으며 횡방향으로의 전도거리는 약간씩 증가하는 경향을 보였으며, 60cm보다 바깥에 충돌되었을 경우에는 종방향 전도거리 와 횡방향 전도거리 모두 감소되는 경향을 보였다. 종방향 및 횡방향의 전도거리 변화는 충돌되는 부분의 위치에 관계없이 일차함수에 가까운 형태로 나타났다.

리프트 장비를 활용한 교통사고 현장촬영 장비 구축

권선민,성경진 대한교통학회 2015 대한교통학회 학술대회지 Vol.73 No.-

곡선형상 스키드마크의 발생원인에 대한 연구

권선민 대한교통학회 2012 대한교통학회 학술대회지 Vol.67 No.-

5단계 가압 맥파측정에 의한 연령별 혈관 경화도 분석

권선민 ( Sun Min Kwon ),강희정 ( Hee Jung Kang ),김윤경 ( Yun Kyoung Yim ),이용홈 ( Yong Heum Lee ) 대한경락경혈학회 2010 Korean Journal of Acupuncture Vol.27 No.2

Objectives: The aim of this study is to measure pulse waveforms by applying 5-level graded pressure, and selecting optimum pulse waveforms. Also to proposing the possibility of using AW(Area of the 1/3 upper height of h1) rate in respect to AT(Total Area) for risk assessment of hypertension or arteriosclerosis is another aim of the study. Methods: Pulse waveforms of normotensive were measured by 5-level graded pressure. The pulse waveforms well reflecting properties of blood vessel(having the largest h1) were selected for optimum pulse waveforms. Various parameters(h-parameter, t-parameter, and others) of optimum pulse waveforms were analyzed. AIx(Augmentation index) was calculated by height-parameters to assess arterial stiffness. The area rate of the 1/3 upper height for h1 in respect to total area was analyzed according to aging. Results: According to aging 1. in height-parameter, h2 and h3 were increased but h5 was decreased. 2. In time-parameter, t2, t3, and t5 were getting short. 3. Area of systolic period was increased, and that of diastolic period decreased. 4. AIx rose by aging. 5. AW was significantly increased despite no changes in AT. Conclusions: By analyzing optimum pulse waveforms of 5-level graded pressure method, we could complement weakness of single graded pressure method. Also, possibility of applying the AW rate to risk assessment of hypertension or arteriosclerosis was confirmed in normotensive population which might not be assessed by AIx.

측정 자세의 변화에 따른 맥의 변화 특성: 선 자세, 앉은 자세, 누운 자세

권선민 ( Sun Min Kown ),강희정 ( Hee Jung Kang ),이상훈 ( Sang Hun Lee ),임윤경 ( Yun Kyoung Yim ),이용흠 ( Yong Heum Lee ) 대한경락경혈학회 2009 Korean Journal of Acupuncture Vol.26 No.4

Objectives: Informations on pulse diagnosis in literature are based on diagnosing pulse waveforms on supine posture. However, today`s pulse waveforms are measured on various postures for the convenience of patients or doctors. For objective measurement, the effect of posture on the pulse waveforms should be considered. The objective of this study was to find posture-related changes in the radial pulse waveforms. Methods: We used an instrument, DMP-3000(DAEYOMEDI Co., Ansan, Korea), measuring radial pulse waveforms noninvasively by tonometric method. 25 male subjects participated in the trial. Before measuring radial pulse waveforms subjects had rest for 5 min. The pulse waveforms were measured on the left wrist. Each subject underwent this course on the supine, sitting, and standing posture. We analyzed pulse waveforms with Height-parameters, Time-parameters, Energy, and Elastic rate. Results: Height-parameters(h1~h5) on the supine posture were bigger than those on the sitting and standing posture. In case of Time-parameters, the parameters making up systolic time decrease in order of on standing, sitting, and supine position. However, systolic time and diastolic time didn`t have any changes. Energy of pulse was the biggest on supine posture and Elastic rate on standing posture. Conclusions: In this study we found that posture changes affect radial pulse waveforms. For quantification of the changes, more trials should be done. After analyzing much data we might apply parameters of pulse waveforms changed by posture. Also, we might diagnose special disease with properties of pulse waveforms by posture.

5단계 가압에 대한 맥파 변화 분석에 의한 맥 패턴 분류와 부침맥(浮沈脈) 연구

권선민 ( Sun Min Kown ),강희정 ( Hee Jung Kang ),임윤정 ( Yun Kyoung Yim ),이용홈 ( Yong Heum Lee ) 대한경락경혈학회 2010 Korean Journal of Acupuncture Vol.27 No.1

Objectives: The information on the depth where pulse wave appears is as important as pulse waveform. The aim of this study was to classify pulse pattern using pressure-height(P-H) volume-curve by 5 applied pressure levels to find out the information on the depth of pulse and interpret the floating & sinking pulse in oriental medical pulse diagnosis. Methods: We used 3 dimensional pulse imaging analyser (DMP-3000, DAEYOMEDI Co., Korea), which measures radial pulse waveforms noninvasively by way of tonometric method at 5 applied pressure levels, and shows P-H volume-curves by applied pressure. 448 subjects were enrolled, pulse waveforms were measured and the P-H volume-curves were gained on the three locations of Chon, Kwan, and Cheok. Results: Gained P-H volume curves were classified into 3 types; increase type, decrease type, and increase-decrease type. Increase-decrease type appeared more often on Chon and Kwan, while increase type appeared more often on Cheok. In a few cases, decrease-type appeared on Chon and Kawn, however it never appeared on Cheok. Conclusions: Through the classification of pulse by P-H volume-curve, we gained the information on the depth of pulse. We speculate the decrease type as floating pulse, the increase-decrease type as middle pulse, and the increase type as sinking pulse in oriental medical pulse diagnosis. After more researches on P-H volume-curve by applied pressure, the P-H volume-curve may be used as an important factor for pulse diagnosis.

유리섬유 코팅사와 탄소섬유를 이용한 일방향 탄소섬유시트 제조 공정이 콘크리트 보강에 미치는 영향

권지은,권선민,채시현,정예담,김종원 한국염색가공학회 2022 韓國染色加工學會誌 Vol.34 No.3

In this study, carbon fiber and coated glass fiber are applied to warp and weft fiber in order to reduce the amount of carbon fiber used in carbon fiber fabrics, which are often used for reinforcement of building structures. A low-cost thermoplastic resin was coated on glass fibers to prepare a shape-stabilizing glass fiber. A unidirectional carbon fiber sheet was manufactured using the prepared coated glass fiber and carbon fiber. In order to identify whether it can be used for reinforcing architectural and civil structures, it was attached to a concrete specimen and its mechanical properties were analyzed. The optimum manufacturing conditions for the coated glass fiber were 0.3 mm in diameter of the coating nozzle, the coating temperature was 190 ℃, and the coating speed was 0.3 m/s. 14 mm was optimal for the weft spacing of the coated glass fiber. The flexural strength of the concrete reinforced with the manufactured unidirectional carbon fiber sheet was slightly lower than that of the concrete reinforced with carbon fiber fabric, but it was confirmed that the reinforcement effect was better when the amount of carbon fiber was considered.

단열성 재료 함량에 따른 PET 원사의 기계적 물성 및 직물의 단열성에 관한 연구

김태윤,권선민,채시현,정예담,조현제,최익성,김종원 한국염색가공학회 2023 韓國染色加工學會誌 Vol.35 No.2

Recently, the automobile industry is developing as the demand for automobiles increases due to industrial development and population growth. In addition, many studies are being conducted to reduce heat loss inside the automobiles in order to save energy inside the automobiles due to environmental regulations. In this study, alumina, nanosilicon, and aerogel, which are adiabatic materials, were filled in PET to manufacture yarn, identify physical and mechanical properties, and weave into fabric to confirm adiabatic performance. As the content of the adiabatic material increased, the tensile strength of the fibers filled with alumina and nanosilicon decreased greatly, and the adiabatic property slightly increased. The tensile strength of fibers filled with the aerogel decreased slightly, but the adiabatic properties were greatly increased. Therefore, it is considered to be due to the large volume fraction in the PET yarn due to the low density of the aerogel.

대전방지 열가소성폴리우레탄 M/B를 이용한 코팅사 제조 조건이 대전방지성에 미치는 영향

정예담,권지은,권선민,채시현,조현제,김우석,김미경,김종원 한국염색가공학회 2023 韓國染色加工學會誌 Vol.35 No.1

In this study, TPU resin for coating was prepared by varying the mixing ratio of antistatic TPU and recycled TPU to manufacture permanent antistatic materials. The coated yarn was prepared by coating on the nylon yarn, and then the thermal, rheological, mechanical properties and antistatic properties were analyzed. In addition, antistatic properties and durability were confirmed after manufacturing UD fabrics using coated yarns. The mixing ratio of antistatic TPU and recycled TPU was most appropriate at 4:6, and the antistatic property had a surface resistance of 2.20 × 109 Ω and a static charge of 398 V. In the coating process, the coating speed was most appropriate at 0.21 m/s, and the surface resistance of the UD fabric manufactured with the coated yarn manufactured under this condition was 6.80 × 109 Ω and the static charge was 484 V. The UD fabric had a surface resistance of 7.21 × 109 Ω and a static charge of 517 V after washing 10 times, and it was confirmed that the permanent antistatic property was excellent.