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 : Tiexin (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
-
Outlier detection of tender evaluation for construction Project
Tiexin Cheng,Yiwang Wang,Tao Guo 인하대학교 정석물류통상연구원 2009 인하대학교 정석물류통상연구원 학술대회 Vol.2009 No.10
The Marking Scheme method is widely used in China for tender evaluation of construction projects, and this method incorporates construction experts’ personal knowledge and experience in selecting the suitable bidder. However, if the low scores of an contractor’s attributes given by experts are entirely removed when the overall score is calculated it may lead to that a contractor with some latent risks to the project will win the bid the project may not be executed and completed in accordance with the contract agreement in this paper, an outlier detection model, which is one of the methods of Knowledge discovery in data (KDD). based in similar coefficient sum was developed to address the aforementioned issue of the Marking Scheme method. early risk warning system of tender evaluation for construction projects based on this model was implemented. with this system the outliers could be found on the basis of the historical data of tender evaluation for the construction projects, according to which risk early warning could be carried out. Subsequently, an empirical survey was conducted in tianjin China, and the survey results confirmed that the proposed system could effectively detect latent risks. Finally, the paper provides suggestions to the employers could be presented to prevent some latent risks and help them increase th success fate of bidding projects
-
Tiexin Liu,Annan Jiang,Zhenghu Zhang,Huaizhong Liu,Jun Zheng 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.6
The lengths of intact rock core pieces (LIRCP) and the corresponding rock quality designation(RQD) are two essential indexes for grasping rock structure. However, joints are usuallysimplified to be perfect planes. Thus, the influence of joint roughness on the LIRCP and RQDis not fully considered. The joint roughness was described by the Hurst exponent (H) and theroot-mean-square of the point heights on a joint (Rq) in the study. Theoretical formulas werederived and a new practical method of building non-planar joint disc models was proposed toreveal the influence of joint roughness and to estimate the LIRCP and RQD in the field. A 3Dpoint cloud with the texture of a rock slope was acquired by photogrammetry to verify thepracticability of the new method. Results showed that: a) the LIRCP obeyed a normaldistribution, and the distribution form was mainly controlled by Rq rather than H when therewas one equal spacing parallel joint set; b) Rq and H significantly affected the mean length andthe number of intact rock core pieces and the value of RQD when joints were non-parallel; c)following the rise of Rq, the number of intact rock core pieces and the value of RQD trendedto increase but the mean length of intact rock core pieces displayed a downtrend; however,the effect degree of Rq on the trend decreased as the rise of H; d) the new method of buildingnon-planar joint disc models was applicable to estimate the LIRCP and RQD in engineeringpractices.
-
Jichao Guo,Jun Zheng,Qing Lü,Zhipeng Xiao,Tiexin Liu 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.10
Discrete fracture network (DFN) simulation is the basis of studying the properties of a rock mass. An important premise of constructing three-dimensional (3-D) DFNs is to ensure that the fracture intensity (P32) of the simulated rock mass equals to that of the real one. In fact, the natural fracture shapes are various, and we can only obtain one-dimensional (1-D) and two-dimensional (2-D) measurements of a rock mass and usually infer 3-D DFNs based on 1-D and 2-D measurements. The following question would be induced: whether the DFNs with the same P32 and different shapes have similar 2-D trace information. Hence, a series of hypothetical 3-D elliptical DFNs with different values of long-short axis length ratio ke are constructed, and disc models are used to represent them. The algorithms of obtaining traces on sampling windows concerning circular and elliptical fractures are developed. The results show that as the values of ke increase, the error rate of the trace numbers and lengths between the elliptical fractures and simulated disc models on the same sampling windows increases. Moreover, because of the significant impact of fracture shape, the Accuracy representation Index is proposed to better evaluate which model is more appropriate for constructing DFNs.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
