http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 권기철 (검색결과 335 건)
- 무료
- 기관 내 무료
- 유료
-
부산은 "과소비"를 무엇으로 해소하는가? : 부산의 지역수지 적자 보전 방식
권기철,권기철 신라대학교 부산학연구센터 2006 부산연구 Vol.- No.4
부산 경제의 어려움은 어제 오늘의 일이 아니며, 그 양상도 다양하게 나타나고 있다. 지역수지 적자도 그 중 하나의 양상이라고 할 수 있다. 부산은 지역내총생산의 구성에 관한 통계자료가 발표되기 시작한 1995년 이래 지금까지 재화 및 서비스의 이출입에서 매년 GRDP의 20퍼센트에 가까운 적자를 기록하고 있다. 이것은 다른 측면에서 보면 부산이 지역내총생산에 비해 민간소비자층이 과도하다는 현상으로 나타난다. 이 때문에 단순한 지역소득통계만을 보고 사람들이 "부산은 과소비 도시"라는 자조의 말을 하기도 한다.
-
권기철,이창주 東義大學校産業技術開發硏究所 2011 産業技術硏究誌 Vol.25 No.-
최근 엔지니어들은 노상토의 탄성계수 및 감쇠비 결정을 위해 다양한 시험기법을 사용하고 있다. 충격공진시험(IR: impact resonance test)은 비파괴시험으로서 간편한 시험장치와 단순한 시험방법이며 반복성이 뛰어나다. 또한 충격공진시험은 탄성계수 뿐만아니라 감쇠비 결정이 가능하다. 이 연구에서는 노상토 시편에 대한 충격공진시험의 다양한 영향요소(시편거치 방법, 충격하중원의 특성, 신호 획득 속도 등)를 평가하고 최적의 시험조건을 제시하였다. 이 연구에서 감쇠비 결정방법에 대해 알아보고 동결·융해에 따른 변화를 보았다. 시료는 국내 4곳의 노상토를 확보 하여 시험하였고, 각각 노상토 마다 감쇠비의 변화를 분석하였다. Recently Engineers are using veriety test method to find The Result of Elastic Modulus and Damping Ratio about Subgarade. Impact Resonance Test is very simple and the repeatability is great. Also, It is possible to dicide not only Elastic Modulus but also Damping Ratio. In this study, It evaluated a lot of factors for example, the way how to put off the samples, the characteristic of Impect and, the velocity of taking signals. Therefore, It suggested the best conditions. In this thesis, We found, How to choose the Damping Ratio and Change of Freezing-Melting test. It used the domestic Subgrade and analyzed Change of Damping Ratio depending on each Subgade.
-
권기철,이재환 한국도로학회 2013 한국도로학회논문집 Vol.15 No.1
PURPOSES : This study is to evaluate a ground water level effect on frost heaving in road pavements METHODS : The effects of water table on frost heaving in pavement systems were evaluated from the mechanical analysis using FROST program. The input parameters and boundary conditions were determined by considering climates, pavement sections, and material properties specially subgrade soil types in Korea. RESULTS : When the water table located above the freezing depth, amount of frost heaving caused by freezing the water in pavement itself was big enough to damage in pavement system, although pavement system consists of fully non-frost-susceptible materials with sufficient thickness of anti-freezing layer. The amount of frost heaving was decreased rapidly with increasing the distance between the water table and freezing depth. CONCLUSIONS : It was concluded that there is no engineering problems related with frost heaving in practical sense when the distance between freezing depth and water table is over 1.5m for having subgrade soils less than 50% of #200 sieve passing to meet specification on quality control in Korea.
-
실내모형시험을 통한 도로함몰 매커니즘에 대한 기초적 연구
권기철,김상록,홍석우 한국도로학회 2016 한국도로학회논문집 Vol.18 No.5
PURPOSES: This study identifies the causes and the mechanism of the occurrence of underground cavities. METHODS: A case study on cave-in and a series of model tests with a small soil chamber were conducted. RESULTS: A hypothesis about the mechanism of the cave-in in road was established, and the basic influencing factors on underground cavity expansion were identified. CONCLUSIONS: It was found that the characteristics of shear strength of soil and direction of water flow had a larger influence on cavity formation and expansion than the characteristics of internal erosion. In addition, large cavities suddenly expanded when cavities were caused owing to breakage of buried sewer pipe.
-
권기철 한국도로학회 2018 한국도로학회논문집 Vol.20 No.1
PURPOSES: The purpose of this study is to identify the road-subsidence mechanism in unsaturated sandy soils. METHODS: A series of soil chamber tests were conducted under various conditions. RESULTS: The cavity-expansion characteristics in unsaturated sandy soils due to seepage were affected by the outlet size, seepage intensity, relative density, and fine content. CONCLUSIONS: In unsaturated sandy soils, the cavity-expansion speed was affected by the outlet size, relative density, seepage intensity, and clay content; however, the cavity-expansion shape was very similar. As the outlet size and seepage intensity increased, the cavityexpansion speed increased. As the relative density increased, the cavity-expansion speed increased because of a sudden decrease in shear strength, resulting from the increased saturation (reduction of matric suction). The cavity expanded faster with the increasing clay content, up to a certain threshold. It expanded at a slower rate once it passed the threshold. Finally, it reached a stable state where the cavity did not expand due to seepage.
-
-
-
-
아스팔트 콘크리트 탄성계수 결정을 위한 충격공진시험 영향요소 평가
권기철,이재환 한국도로학회 2007 한국도로학회논문집 Vol.9 No.2
The stiffness of the asphalt concrete is represented by the complex modulus, E*, which is very important properties in the mechanistic design of flexible pavement system. The moduli of asphalt concrete were generally determined by dynamic modulus test. However, the dynamic modulus testing method is too complex, expensive, and time consuming to be applicable on a production basis. The IR(Impact Resonance) method has been shown to be a truly simple nondestructive testing method which produces very repetitive, consistent results. The major object of this study was to estimate of the effects on IR tests for determining modulus of asphalt concrete including impact position, specimen support condition, impact steel ball size and sampling rate. The variations of IR test results with various testing conditions are within ±2.7%.
-
코리아스칼라연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
