• International Journal of Highway Engineering
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• v.12 no.3
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• pp.131-137
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• 2010

In this paper, overseas criteria and research results were reviewed to develop a rational criterion proper to domestic airport runways on measurement of friction coefficient and removal of rubber deposit. The friction coefficients of the runways of the Incheon International Airport were measured by the ASFT(Airport Surface Friction Tester) from August 2007 to July 2009 and the data at intensively landed points were analyzed. Variation of the friction coefficient due to accumulation and removal of tire rubber was analyzed and seasonal influence on the variation were investigated by pavement types. The friction coefficient steadily decreased over a long term despite periodical removal of the rubber deposits. The variation of the friction coefficient in summer was larger than other seasons and asphalt pavement was more sensitive to the seasonal influence than concrete pavement. The friction coefficient of the asphalt pavement with macro texture was even larger than that of early age concrete pavement with micro texture. The variation of the friction coefficient of the asphalt pavement due to the deposit and removal of the tire rubber was also larger than that of the concrete pavement.

• International Journal of Highway Engineering
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• v.13 no.1
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• pp.185-195
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• 2011

Aircraft-related accidents cause mass casualties and major material damages. At present, runway-related accidents in our country account for 28% of all air accidents. Furthermore, internationally 33% of all air accidents is connected with runway. To prevent these accidents, FAA mandates the installation of aircraft rapid arresting system(ARAS) at the runway end safety areas which do not meet the FAA requirements. Even if the areas satisfy the conditions, FAA recommends the installation of ARAS to ensure the safety. In accordance of the international affairs, the domestic studies for ARAS are in progress and the legal formalities for domestic adoption of ARAS is under way. In this study, we analyzed the stopping distance, drag force, vertical force and tire penetration of runway overrun to assess the performance of ARAS reasonably by using two different kinds of analysis programs. The first is ARRESTOR program adopted by FAA, and the second is LS-DYNA which is available for 3-dimensional nonlineal dynamic analysis. As a result, analytically the stopping distances between two programs are similar. The drag force is rather different, but the tendencies are similar. Later on, the 3-dimensional simulation analysis considering various air-craft condition and properties of packaging materials is necessary. In addition, ongoing development of simulation analysis program is required for more accurate analistic results.

• Journal of the Korean Society for Aviation and Aeronautics
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• v.18 no.3
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• pp.70-76
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• 2010

In this study, we surveyed the operating status of the Light Sport Aircraft(LSA) in Korea, and reviewed the minimum requirements of the airpark for LSA. We are discuss about increased aerodrome traffic density and safety improvement, through the installation of the exit taxiway. The shape of the exit taxiway of an airpark used in LSA is a rectangle for usable two way direction of runway. The array types of exit taxiway influence paved and unpaved runway occupancy time of LSA.

• Proceedings of the Korea Water Resources Association Conference
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• 2016.05a
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• pp.166-166
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• 2016

국내에서는 기후변화로 인해 집중호우 및 태풍 발생이 증가하고 있으며, 이는 자연재해의 발생뿐만 아니라 차량 및 항공 운항의 어려움을 야기한다. 차량 및 항공 운항의 안정성 확보를 위해서는 노면의 마찰저항을 유지하는 것이 중요한데, 강수로 인해 형성되는 수막두께는 노면의 마찰저항을 감소시키므로 포장설계시 고려해야 할 주요소이다. 특히, 물적/인적 이동이 많은 공항은 기상조건에 더욱 취약하며, 기후변화로 인한 강수특성 변화로 활주로의 수막두께 증가 및 운항의 차질이 우려되고 있다. 따라서 본 연구에서는 과거 및 미래 강우조건에 따라 활주로 노면의 수막두께를 산정하고, 기후변화에 따른 수막두께의 변화를 평가하고자 한다. 과거 관측 및 기후변화 시나리오를 이용하여 강우자료를 생산하였고, 이를 강우-유출 모형의 강우 입력 자료로 활용하였다. 과거 강우자료는 인천지점의 기상청 관측자료를 수집하였으며, AR5 RCP 시나리오(RCP4.5, RCP8.5) 기반의 적정 GCMs 결과를 활용하여 미래 강우시나리오를 산정하였다. 강우의 재현기간 및 지속시간에 따른 수막두께의 변화를 분석하기 위해 인천지역의 과거 및 미래 확률강우량을 산정하였다. 수막두께를 산정하기 위해 활주로 폭, 경사 등 활주로 제원을 수집하고, 유출 모형의 입력자료를 구축하였다. 과거 및 미래 확률강우량을 SWMM 모형에 적용하여 유출량을 산정하였으며, 유속과 흐름폭으로 나누어 활주로의 수막두께를 산정하였다. 산정결과, 강우량이 증가함에 따라 수막두께는 증가하고, 강우의 지속시간이 증가함에 따라서는 감소하는 것으로 분석되었다. 미래의 경우, 기후변화의 영향에 따라 강수량이 증가하여 수막두께가 과거에 비해 증가하였다.

• Journal of the Korean Society of Hazard Mitigation
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• v.9 no.1
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• pp.21-25
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• 2009

The results of a recent case study for material characterizations and structural evaluation to design asphalt overlay thickness of William P Hobby airport in Houston, Texas are presented herein. The existing runway 12R-30L of Hobby airport consisted of thick asphalt overlay over Portland Cement Concrete (PCC) and the localized surface shoving as evident in the closure of surface groove has been observed recently. Using the field cored asphalt concrete mixtures, measurements of percent air voids, asphalt content and aggregate gradation were conducted to find out the causations of surface shoving and groove closure. The FAA layered elastic program, LEDFAA was utilized to evaluate pavement structural conditions for new asphalt overlay. Two different composition assumptions for existing pavement were made to evaluate the pavement as followings: 1) APC, Asphalt Concrete Overlay over PCC pavement and 2) AC, Asphalt Concrete pavement. Based on laboratory testing results, a ratio of percent passing #200 to asphalt content ranged 1.1 to 2.2, which is considered a high ratio and a tendency of tender mix design was observed. Thus, the localized surface shoving and groove closure of the runway 12R-30L could be attributed to the use of excessive fine contents and tender mix design. Based on the structural evaluation results, it was ascertained that the analysis assuming the pavement structure as AC pavement gives more realistic structural life when the asphalt overlay is thicker enough compared to PCC layer because the existing PCC pavement under asphalt overlay acts more like a high quality base material.