• Journal of the Korea Concrete Institute
• /
• v.14 no.6
• /
• pp.942-948
• /
• 2002

When fresh concrete is exposed to low temperature, the concrete may suffer frost damage due to freezing at early ages and the strength development may be delayed. One of the solution methods to resolve these problems is to reduce freezing temperature of concrete by the use of chemical admixture called Accelerator for freeze protection. In this study we Investigate the effect on the strength development of cement mortar using accelerator for freeze protection with the variable curing condition. As the result of this study, the mortar using accelerator for freeze protection show continuously the strength development in curing condition of -5$^{\circ}C$. And the compressive strength under variable temperature condition was higher than constant temperature condition in same maturity.

• Journal of the Society of Disaster Information
• /
• v.11 no.4
• /
• pp.570-580
• /
• 2015

In the study, planning indicator that should be considered in applying traffic calming technique was derived, and it was intended to analyze the importance of indicator that should most considered in planning traffic calming technique through AHP analysis on the basis of it. The result of planning indicator may be summarized by dividing into road section and crossing section. In road section, hump (0.35) for equipment stimulating reduction of speed, hump image/fort (0.31) for visual control equipment, and slalom type road (0.52) for chicane, and bollard (0.47) for blocking passing route are shown to be the most important and come before anything. In crossing section, signal indicator (0.33) for visual control equipment, rumble strip (0.44) for equipment stimulating reduction of speed, zigzag type road (0.65) for chicane, and blocking going straight at crossing (0.45) for blocking passing route are shown to be the most important and come before anything. The result of the study is judged to be used for basic material in applying traffic calming technique and establishing policy hereafter.

• 기계와재료
• /
• v.8 no.1 s.27
• /
• pp.69-78
• /
• 1996

• NEWSLETTER 전기공업
• /
• no.94-15 s.112
• /
• pp.43-46
• /
• 1994

• The monthly packaging world
• /
• s.86
• /
• pp.177-181
• /
• 2000

• Proceedings of the Korea Water Resources Association Conference
• /
• 1989.07a
• /
• pp.195-202
• /
• 1989

• Proceedings of the Korean Society for History of Mathematics Conference
• /
• 2005.11a
• /
• pp.1-1
• /
• 2005

• The Bulletin of The Korean Astronomical Society
• /
• v.19
• /
• pp.7.1-7.1
• /
• 1994

• Fire Protection Technology
• /
• s.54
• /
• pp.10-13
• /
• 2013

• Journal of Ocean Engineering and Technology
• /
• v.17 no.1
• /
• pp.16-20
• /
• 2003

본 연구에서는 입사파에 의한 항내 정온도 계산 시 사용되는 수치해석 기법에 대한 검증 및 실제 항만에 대한 적용을 하였다. 해석기법은 유한요소기법 (finite element technique) 을 사용하였고 기본방정식은 경계조건과 마찰을 고려한 완경사방정식 (mild-slope equation) 을 사용하였다. 해석의 검증을 위하여 임의형상 항만에 대해 본 해석법을 적용하여 수치해석을 실시한 결과와 다른 수치해석결과 및 실험결과를 비교했을 때 좋은 일치를 나타내었다. 제주항에 대해서 2가지의 각기 다른 입사파 조건을 적용하여 계산한 결과 제주항이 방파제 설계파인 NNW방향 (Case 2)인 경우가 NE 방향 (Case 1)인 경우보다 약간 양호한 정온을 확보하는 것을 알 수 있었다.