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Push-Out Tests on Interlocked Angles Connectors in Steel-Concrete-Steel Composite Structure
Junyi Chen,Yonghui Wang,Ximei Zhai,Xudong Zhi,Menghan Sun 한국강구조학회 2023 International Journal of Steel Structures Vol.23 No.2
This paper reported a new interlocked angle connector (IAC) for steel-concrete-steel sandwich structures. Shear performances of IACs embedded in normal concrete were studied via a push-out testing program, and the failure mode, shear resistance, and load–slip responses of IACs in normal concrete were obtained. The influences of height, width, thickness, orientation of steel angles, and interlocking bolts on shear behaviours of IACs were experimentally studied. The experimental results indicated that the ultimate shear resistances and slip capacities of IACs were improved via increasing the height, width and thickness of steel angles, while the orientation of steel angles exhibited limited influence on the ultimate shear resistances and failure modes of IACs. In addition, the analytical models were proposed for predicting ultimate shear resistances and load–slip behaviours of IACs. The experimental results were employed to validate the analytical models, and the proposed analytical models were found to provide more accurate predictions on ultimate shear resistances and load–slip behaviours of IACs as compared to the existing design codes.
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( Junyi Shen ),( Linye He ),( Chuan Li ),( Tianfu Wen ),( Weixia Chen ),( Changli Lu ),( Lvnan Yan ),( Bo Li ),( Jiayin Yang ) 대한간학회 2017 Gut and Liver Vol.11 No.5
Background/Aims: Solitary hepatocellular carcinoma (HCC) is a subgroup of HCCs. We aimed to establish nomograms for predicting the survival of solitary HCC patients after hepatectomy. Methods: A total of 538 solitary HCC patients were randomly classified into training and validation sets. A Cox model was used to identify predictors of overall survival (OS) in the training set. A nomogram was generated based on these predictors and was validated using the validation set. Results: Tumor size, microvascular invasion, and major vascular invasion were significantly associated with OS in the training set. Nomograms were developed based on these predictors in the multivariate analysis. The C-index was 0.75 for the OS nomogram and 0.72 for the recurrence-free sur-vival nomogram. Compared to the index of conventional stag-ing systems for predicting survival (0.71 for Barcelona Clinic Liver Cancer, 0.66 for the seventh American Joint Committee on Cancer, 0.68 for Cancer of the Liver Italian Program, and 0.70 for Hong Kong Liver Cancer), the index of the OS nomo-gram was significantly higher. Moreover, the calibration curve fitted well between the predicted and observed survival rate. Similarly, in the validation set, the nomogram discrimination was superior to those of the four staging systems (p<0.001). Conclusions: The nomograms demonstrated good discrimi-nation performance in predicting 3- and 5-year survival rates for solitary HCCs after hepatectomy. (Gut Liver 2017;11:684- 692)
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Zixu Su,Wei Chen,Changzhen Li,Junyi Yu,Guojiao Gong,Zixin Wang 한국전자통신연구원 2023 ETRI Journal Vol.45 No.5
The application of unmanned aerial vehicles (UAVs) has recently attracted considerable interest in various areas. A three-dimensional multiple-input multiple-output concentric two-hemisphere model is proposed to characterize the scattering environment around a vehicle in an urban UAV-to-vehicle communication scenario. Multipath components of the model consisted of lineof-sight and single-bounced components. This study focused on the key parameters that determine the scatterer distribution. A time-variant process was used to analyze the nonstationarity of the proposed model. Vital statistical properties, such as the space–time–frequency correlation function, Doppler power spectral density, level-crossing rate, average fade duration, and channel capacity, were derived and analyzed. The results indicated that with an increase in the maximum scatter radius, the time correlation and levelcrossing rate decreased, the frequency correlation function had a faster downward trend, and average fade duration increased. In addition, with the increase of concentration parameter, the time correlation, space correlation, and levelcrossing rate increased, average fade duration decreased, and Doppler power spectral density became flatter. The proposed model was compared with current geometry-based stochastic models (GBSMs) and showed good consistency. In addition, we verified the nonstationarity in the temporal and spatial domains of the proposed model. These conclusions can be used as references in the design of more reasonable communication systems.
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