• Transactions of the Korean Society of Mechanical Engineers A
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• v.41 no.7
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• pp.629-634
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• 2017

In the case of the UHP (Ultra high performance) tire that the demand has increased rapidly, compared with the commonly used tire, severe deformation has been observed because of the low aspect ratio. When repeated deformations are applied to the sidewall rubber, accumulated fatigue damage may cause fatigue failure. Thus, the evaluation of the durability of the tire sidewall rubber has become a very important issue to prevent accidents that occur while the vehicle is running. However, the research and design criteria for the durability performance of the tire sidewall rubber hardly exist. In this study, we suggest a lifetime prediction formula using strain energy density obtained by performing tensile tests and fatigue tests on two different kinds of the tire sidewall compounds. Additionally, the applicability of our findings for low fuel consumption tires was reviewed by converting the fatigue life of the sidewall rubber into the expected mileage of the tire.

• The tire
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• s.147
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• pp.29-30
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• 1990

• Transactions of the Korean Society of Mechanical Engineers A
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• v.27 no.10
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• pp.1667-1675
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• 2003

This paper has considered the calculation of lateral stiffness of radial tire's sidewall, which consists of cord stiffness and rubber sheet stiffness, by using the material constants of rubber compounds of tire. We have suggested and illustrated how to calculate the rubber sheet lateral stiffness by considering the following aspects. First, the rubber sheet consists of various kinds of rubber compounds with different thickness along the sidewall in the radial direction. Secondly, equivalent Young's modulus of the rubber sheet can be calculated by using available experimental data of rubber compounds. The present method enables us to divide the calculation domain as many as we want, which can reduce numerical error in the calculation of geometrical and mechanical properties. We have illustrated the calculation by using the data of the radial tire for passenger car of P205/60R15.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.40 no.4
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• pp.245-253
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• 2016

The friction and deformation of a tire causes heat generation, which causes a temperature rise of the tire. This temperature rise can be a source of tire damage. The object of this study is to investigate the cooling effect of the application of a fin to the tire side to suppress the temperature rise. Eight different fin shapes were considered, and the sidewall surface temperature reduction owing to the cooling fin shape was numerically analyzed. In addition, the flow characteristics and heat transfer characteristics of the vortex of the pin rear were compared.

• 프린팅코리아
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• v.12 no.4
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• pp.90-91
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• 2013

한국어도비시스템즈(대표 지준영, www.Adobe.com/kr)는 지난 3월 11일 기자간담회를 열고, 어도비 크리에이티브 클라우드의 한국 출시를 발표했다. 어도비 크리에이티브 클라우드는 클라우드 서비스 형태로 어도비가 제공하는 모든 솔루션과 애플리케이션을 제공하는 것으로, 개인 멤버십을 기반으로 데스크톱 툴과 함께 출판 및 파일 공유를 위한 온라인 서비스, 즉각적인 기능 업데이트 및 업그레이드 서비스 등을 제공한다.

• 프린팅코리아
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• v.12 no.4
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• pp.88-89
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• 2013

한국 HP가 지난 3월 13일 타임스퀘어 아모리스홀에서 신제품 출시회를 갖고 빠른 인쇄 속도와 경제성을 동시에 잡은 HP 오피스젯 프로 X 시리즈를 공개했다. 한국HP는 오피스젯 프로 X 시리즈를 통해 대기업 부서 및 중소기업에 효율적인 문서 출력 환경을 제공하며, 기업용 잉크젯 프린터 시장 판도에 혁신적인 변화를 주도하겠다고 밝혔다.

• 프린팅코리아
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• v.12 no.7
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• pp.102-103
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• 2013

썬에스지엠(주)(대표이사 곽인효)가 지난 6월 11일 신사옥 준공식 및 창립 27주년 기념식을 부천시 신사옥에서 개최했다. 이날 행사는 업계 관계자 350여 명이 참석하는 등 높은 관심 속에 성황을 이뤘다.

• 프린팅코리아
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• v.12 no.7
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• pp.104-105
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• 2013

다이니폰스크린코리아(주)(대표이사 전익성)은 코리아팩 2013 기간 중인 지난 5월 30일 킨텍스 제1전시장 세미나실 208호에서 '미래 패키징 신기술 세미나'를 개최했다. 가장 주목받는 인쇄분야로 떠오르고 있는 패키징 분야에 대한 다이니폰스크린의 관심과 전략을 드러내는 세미나였다.

• Journal of Ginseng Research
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• v.33 no.1
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• pp.8-12
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• 2009

A simple gradient HPLC method for rapid determination of major ginsenosides ($Rg_1$ and $Rb_1$) and unique ginsenoside (Rf) of Korean ginseng (Panax ginseng C.A. Meyer) was developed. Within 50min, three ginsenosides have been separated and identified on $\mu$-Bondapak $C_{18}$ column ($3.9{\times}300\;mm$, $10{\mu}m$) with gradient elution using water and acetonitrile as a mobile phase. The method was validated in terms of linearity, accuracy, and precision. The correlation coefficients ($r^2$) for calibration curves of ginsenosides were over 0.9997. The developed HPLC method was successfully applied to the analysis of ginseng samples and the recoveries of ginsenosides were in the range of $101.1{\sim}115%$ with RSD<3.2%. The developed method could be used for rapid evaluation of the ginsenosides $Rg_1$, $Rb_1$, and Rf.

• Proceedings of the KSME Conference
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• 2004.11a
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• pp.805-810
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• 2004

The model is verified thorough simulations and experiments. And then the developed model is applied to a half car model and automobile vibrations are analyzed. The effects of tire design parameters on the automobile vibration energy are investigated. The results from laboratory and field tests confirm the validity of the analytical model. The 17-DOF half-car model is built to analyze the automobile vibration. The characteristics of the nonlinear model for a shock absorber are applied to this model. The results from the present 17-DOF half car model incorporating the analytical tire model with tire design parameters, are compared with a 5-DOF half car model where the tire is modeled with linear springs. The results of the 17-DOF model are closed to experimental results. Using the 17-DOF model, the influences of tire design parameter are considered. According to the results of analyses, the vibrations at seat/body/wheel are predicted by simulation and experiment.