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이대경(Dae-Kyung Lee),정지수(JI-Su Jeong),이경창(Kyung-Chang Lee),손정현(Jeong-Hyun Sohn) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
When the autonomous vehicle run on off road such as sandy road, soil and etc, a special attention is required for safety and performance. In this study, a tire test bed is proposed for investigating the dynamic behavior of the tire running on the sandy and soil road. The torque and translational pulling force is established for generating the slip ratio. In addition, the load cell is attached at the guide for measuring the vertical and longitudinal tire force. The dynamic responses of a tire according to several road conditions and driving conditions can be analyzed.
이대창 ( Dae Chang Lee ) 한국노동경제학회 2016 勞動經濟論集 Vol.39 No.1
고용노동부 『고용보험DB』의 상실자 종합통계와 실업급여 지급통계를 이용하여 구직급여 수급자격자의 수급과 재취업에 따른 수급자격 상실을 경합적 위험(competing risks)모형으로 분석하였다. 아울러 구직급여 수급률과 경기지수 간의 교차상관관계 분석을 하였다. 분석결과 구직급여 수급률이 실업률과 정(+)의 상관관계를 보이고, 6개월가량 실업률과 경기동행지수를 선행한다. 아울러 수급률이 연령, 학력, 급여지급기간, 소득대체율과 정(+)의 상관관계를 보이고 있다. This paper investigates the cyclical behavior of UI benefit take-up rate, the share of unemployed persons who are eligible for job seekers’ allowances(JSA) and actually receive them. Using Korea’s Employment Insurance DB, it also identifies the factors linked to the decision to take up job seekers’ allowances. The results show that the take-up rate is countercyclical and leads both unemployment rate and Coincident Composite Index cyclical component by 6 months and is positively correlated with replacement rate and benefit duration, suggesting that extending benefit duration and raising benefit level can boost benefit claims to increase take-up rates in Korea.
이대창 ( Dae Chang Lee ) 한국노동경제학회 2015 勞動經濟論集 Vol.38 No.1
한국의 구인·구직 매칭함수를 추정하였다. 사업체노동력조사 와 워크넷의 빈 일자리 수 과소 측정 문제를 극복하기 위해 채용동학모형을 통해 빈 일자리 잠재변수를 도출하고 이를 위한 도구변수를 매칭함수 추정에 활용하였다. 매칭 효율에 영향을 주는 구직자 속성과 공공고용서비스의 효과도 검증하였다. 구인·구직 매칭함수의 규모에 대한 수익불변(constant returns to scale)을 확인하였고, 매칭 효율은 구직자 중 전문대졸 학력자 비중과 정(+)의 상관관계를, 실업급여 수혜 비율과는 부(-)의 관계를 보였다. The aggregate matching function is estimated to explain dynamics among job seekers,vacancies and new hires in Korea. Due to measurement errors inherent in vacancies data, I introduce a latent variable for job openings and use the instrumental variables to correct its endogeneity. Matching efficiency is also estimated using some explanatory variables like job seekers’ characteristics and public employment services. The result shows that Korea’s matching function also exhibits a constant returns to scale.
[안전] 트럭의 승객거동해석을 위한 유한요소 모델의 개발
홍창섭(Chang-Sup Hong),오재윤(Chae-Youn Oh),김학덕(Hak-Duck Kim),이대창(Dae-Chang Lee),송주현(Ju-Hyun Song) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_2
This paper develops a finite element model for studying occupant behavior of a truck equipped with a driver side airbag. The developed model simulates an occupant behavior using PAM-SAFE in IBM super computer RS/6000. The model is developed based on a sled test. A 50% hybrid dummy I II is used for measuring head and chest accelerations and femur loads. and major injury coefficients such as HIC, CA and femur load. Interior parts of the truck compartment are modeled using rigid bodies and contact type II of PAM-CRASH. In the definition of contact type II, force-deflection relationships of each body is utilized. Airbag cushion is modeled using shell elements. Airbag cover groove is modeled using rivet elements. Airbag tether is modeled as nonlinear bar elements. Airbag model has two vent holes to ventilating the exploded gas. Airbag is folded close to the real airbag folding procedure, and folded cautiously in order not to have initial penetration. A vehicle pulse acquired from 31 mph frontal barrier test is used as input signal for the simulation. The simulation conditions are tuned to the sled test ones. The measured dummy accelerations and major injury coefficients and filmed dummy behavior and airbag inflation process using high speed camera are compared to the simulation results to verity the developed finite element model.
[안전] 트럭의 충돌 특성해석을 위한 유한요소 모델의 개발
홍창섭(Chang-Sup Hong),오재윤(Chae-Youn Oh),김학덕(Hak-Duck Kim),이대창(Dae-Chang Lee),송주현(Ju-Hyun Song) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_2
This paper develops a finite element model for the crashworthiness analysis of a truck. A simulation for a truck frontal crash to a rigid barrier using the model is performed with PAM-CRASH installed in IBM super computer RS/6000. Full vehicle model is composed of 86467 shell elements, 165 beam elements and 98 bar elements, and 86769 nodes. The model uses four material model such as elastic, elastic-plastic(steel), rigid and elastic-plastic(rubber) material model which are in PAM-CRASH. Frame and suspension system are modeled with 28774 shell elements and 31412 nodes. Cab is modeled with 34680 shell elements and 57 beam elements, and 36254 nodes. Bumper is modeled with 2262 shell elements, and 2508 nodes. Axle, steering shaft, etc are modeled using beam or bar elements. Mounting parts are modeled using rigid bodies. Bodies are interconnected using nodal constrains or joint options. To verify the developed model, frontal crash test with 30mph velocity to a rigid barrier is carried out. In the crash test, vehicle pulse at lower part of b-pillar is measured, and deformed shapes of frame and driver seat area are photographed. Those measured vehicle pulse and photographed pictures are compared those from the simulation to verify the developed finite element model.
송주현(Ju-Hyun Song),이대창(Dae-Chang Lee),김학덕(Hag-Duck Kim),오재윤(Chae-Youn Oh) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper develops a finite element model for crashworthiness analysis of a small-size bus. A frontal crash simulation to a rigid barrier using the developed model is performed with PAM-CRASH installed in super computer SP2. Full vehicle model is composed of 31,982 shell elements, 599 beam elements and 42 bar elements, and 34,204 nodes. The model uses four material model such as elastic, elastic-plastic(steel), rigid and elastic-plastic(rubber) material model of PAM-CRASH. Frame and suspension system is modeled with 5275 shell elements and 5679 nodes. Body is modeled with 21633 shell elements. To show the reliability of the developed model, frontal crash test with 30mph velocity to a rigid barrier is carried out. Vehicle pulses at lower part of left and right b-pillar are measured, and deformed shapes of frame and driver seat area are photographed. Those crash test results are compared with the simulation results using the developed finite element model.