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조진래,신성우,정현성,김남전,김기운,Cho, Jin-Rae,Shin, Sung-Woo,Jeong, Hyun-Sung,Kim, Nam-Jeon,Kim, Kee-Woon 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.10
Contacting with ground in the post-card area size only, tire supports entire automobile weight. As well, it characterizes most of automobile running performance. Among the design parameters, the carcass contour becomes a key design factor. This paper deals with the time-effective optimal design of tire crown contour in order to improve the tire wear performance by employing a back-propagation neural network model.
요통 여성 노인의 장애물과 이중 과제 보행 시 속도 및 입각기 시간 분석
조용호 ( Yong Ho Cho ),정현성 ( Hyeon Seong Jeong ),박래준 ( Rae Joon Park ),배성수 ( Sung Soo Bae ),김경 ( Kyung Kim ),권용현 ( Yong Hyun Kwon ),조혁태 ( Hyuk Tae Cho ),황윤태 ( Yoon Tae Hawng ) 대한물리의학회 2010 대한물리의학회지 Vol.5 No.4
Purpose:This study was to evaluate gait velocity and stance time on 5 conditions in elderly women and elderly women with LBP. The subjects were 70`s generation. Methods:The subjects are 20 divided into 2 groups. They measured gait velocity, stance-time. The 5 conditions were normal gait, 10cm obstacle gait, 25cm obstacle gait, dual 10cm obstacle gait, dual 25cm obstacle gait. The experimental period was between 2008/12 and 2009/2, Statistical analysis was used Repeated measurement for difference between conditions, independent t-test for difference in two groups. Subjects were countdown from 50 during dual task gait. Results:The results were as follow: there were significantly diffrerence 10cm obstacle velocity, dual 10cm obstacle velocity in two group. The others were not significantly differences. Velocity and stance-time were significantly difference in control group. In dual 25cm obstacle gait, velocity was difference of normal gait. Stance time was difference in 25cm obstacle gait, and dual 25cm obstacle gait. In Experimental group, velocity and stance-time were not significantly difference. But measured value of velocity was gradually decreased and stance time was increased. Conclusion:These results indicate that elderly people with LBP women are reduced gait ability in dual task, and obstacle condition, So they need to prevent falling in dual task, and obstacle gait and to train obstacle/dual tak gait.
한윤호(Yoon-Ho Han),안현근(Hyun-geun An),정현성(Hyean-Sung Jung),최진환(Jin-Hwan Choi),박정수(Jeong-soo Park) 한국철도학회 2016 한국철도학회 학술발표대회논문집 Vol.2016 No.10
노면전차(트램)는 19세기 도로교통의 발전으로 미국에서 처음 실용화되었고 한국은 1898년 경성 전차를 시작으로 서울 서대문-청량리 구간을 운행하고 점차 용산, 원효로, 영천, 노량진 등 외곽지역으로 확장되어 널리 사용되다, 광복 이후 1968년 버스로 대체되면서 역사에서 사라졌지만 현재에 와서 대도시를 중심으로 교통체증 및 환경문제로 인해 대중교통 개선을 요구하고 있다. 최근에 대중교통을 확장할 때 필요한 건설비가 막대하기 때문에 비교적 경제성이 우수한 한국형 신 노면전차 시스템의 적용성을 적극적으로 검토하고 있다. 이에 본 논문은 신 노면전차 국내외 사례를 조사하고 한국형 신 노면전차의 도입과 안전성을 검토하고자 한다. Street car (Tram) has commercialized since 19<SUP>th</SUP> in the U.S.A, and in South Korea, Street car has commercialized in 1898 named Gyung-sung street car. It offered a Seodaemun to Cheongnyangni section, but it expanded to outside area such as Yong-san, Young-chun and Noryangjin. In 1986, after independence, the street car was replaced to the bus, so it disappeared into history. However, recently, street car system is shed new light as a solution of traffic jam and natural pollution of downtown. Furthermore, expanding and installing money of public transportation is enormous, so Korea examines the Tram system because of economic benefits. So, this essay is going to search examples of the Tram, moreover, look for introducing and stability of new Korean model of Tram.
김진국(Jin Kook Kim),정경문(Kyoung Moon Jeong),김기운(Kee-Woon Kim),정현성(Hyun-Sung Jeong),이정환(Jung Hwan Lee) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Steel is one of the highest tensile strength materials among the tire reinforcing materials. However, due to its high specific gravity, the breaking strength per unit weight is lower than most textile reinforcing materials. This weight disadvantage can be offset by the higher strength/volume ratio of steel cord. Therefore, steel cord is a good candidate for the carcass of radial truck tire. Fatigue resistance and fretting fatigue resistance are very important properties for the steel cord in the application of tire carcass, where tensile stress and bending stress are possible loading conditions. This is why the severe under-inflated and/or overloaded services can cause cord fatigue fracture in the truck tire carcass. In this paper, we suggest an approach to estimating the fatigue life of the steel cords used in tires using the finite element method.