• 타이어
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• 통권15호
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• pp.29-37
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• 1968

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2007년도 춘계학술대회 논문집
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• pp.135-136
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• 2007

• 타이어
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• 통권86호
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• pp.37-47
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• 1980

국제연합무역개발회의(UNCTAD)가 1976년 제4회 나이로비 총회이후, 추진해온 일차산품 종합계획 중 천연고무에 관한 교섭은 79년 10월초에 정리되어 정식으로 천연고무 상품협정이 발족하게 되었다. 동협정은 80년 1~6월간에 제네바에서 각국이 서명하고, 7~9월에 각국에서 비준하여 10월에 발족될 전망이다. 완충재고를 중심으로 한 동협정은 UNCTAD의 18개품목의 협정 중, 경제조항과 의무분담을 골자로 한 협정으로서는 처음 있는 일로서 주목되고 있다. 동협정은 천연고무가격의 안정과 공급안정을 목적으로 한 것이나, 동협정이 발효되더라도 현재에는 최고가격인 270싱가포르센트 이상으로 되어 있으므로 당분간은 아무런 효과도 거두지 못할 것으로 보인다. 고무업계에서는, 「천연고무가격이 안정되는 것은 환영하고 있으나 고가안정으로 (주석협정과 같이) 될 두려움마저 있다」고 평하고 있으며, 원재료앙등에 고심하고 있다. 전문 68조로 된 천연고무 국제협정의 내용은 다음과 같다.

• 한국정밀공학회지
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• 제24권7호
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• pp.106-111
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• 2007

In this paper, the transient brake time was studied on the van type vehicle with accelerometer. Experiments were carried out on the asphalt(new and polished), unpacked road(earth and gravel) and on wet or dry road conditions. The transient brake time is not effected bzy the vehicle speed. The transient brake time is about 0.41$\sim$0.43second on the asphalt road surface and the error range is within 0.1$\sim$0.16second. For the asphalt road condition, the transient brake time is not effected by both new asphalt road surface and the polished asphalt road surface. With compared by dry and wet road surface condition, the transient brake time of wet condition is longer than dry road condition and compared with unpacked road condition and packed road condition, unpacked road condition is shorter than packed road condition. It is considered that the transient brake time is effected by the road surface fraction coefficient. In other words, the transients brake time increases as friction coefficient decreases.

• 한국자동차공학회논문집
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• 제15권5호
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• pp.174-179
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• 2007

The transient brake time or distance is one of very important factors to guess the vehicle speed to inspect an automobile accident. But, it is usual that the vehicle speed is estimated by using only skid mark without considering the transient brake distance. Deceleration and the friction coefficients of tire and road surface play an important role in calculating the brake distance. In this paper, a scheme is presented to estimate more accurate automobile speed. The scheme contains the effect of the transient brake distance on the speed. Experiment was carried out on the asphalt, unpacked road to get relationships between the speeds and the skid mark distances, and to get the transient brake time. The experimental results were utilized to construct the equation to approximate more realistic vehicle speeds.