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Cheng-Bin Jin(김성빈),Trung Dung Do,Mingjie Liu,Hakil Kim(김학일) 제어로봇시스템학회 2018 제어·로봇·시스템학회 논문지 Vol.24 No.3
When we say a person is texting, can you tell the person is walking or sitting? Emphatically, no. In order to solve this incomplete representation problem, this paper presents a sub-action descriptor for detailed action detection. The sub-action descriptor consists of three levels: posture, locomotion, and gestures. The three levels provide three sub-action categories for a single action in order to address the representation problem. The proposed action detection model simultaneously localizes and recognizes the actions of multiple individuals in video surveillance using appearance-based temporal features with multi-convolutional neural networks. The proposed approach achieved a mean average precision of 76.6% for frame-based measurement and 83.5% for video-based measurement of the ICVL video surveillance dataset. Extensive experiments on the benchmark KTH dataset demonstrate that the proposed approach achieved better performance, which in turn improves action recognition performance in comparison to the stateof-the-art methods. The action detection model can run at around 25 fps with the ICVL dataset and at more than 80 fps with the KTH dataset, which is suitable for real-time surveillance applications.
Cheng Bin Cui,범현규 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.1
The intergranular fracture toughness of Cu bicrystals with symmetric tilt grain boundaries was investigated usingatomistic simulations. Mode I fracture of Cu bicrystals with an intergranular crack was considered. The boundaryconditions were specified by the near-tip displacement fields obtained based on linear elastic fracture mechanics(LEFM). Based on the energy interpretation of the energy release rate, a two-specimen method was adopted todetermine the fracture toughness. The simulation results of the fracture toughness matched well with those determinedusing LEFM. In contrast to the toughness obtained using the Griffith energy criterion, the atomistic simulationresults for the same bicrystal were not constants, but dependent on the crack-tip circumstances. Thisbehavior was mainly associated with the different local stress conditions and fracture patterns observed for the differentmodels.
Bin Cheng,Dingjie Guan,Bingxue Jing 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.23 No.2
Small and medium-sized manufacturing enterprises involve a lot of customized products. The degree of adaptability should be noted while improving product design and manufacturing digital and intelligent levels. This paper presents a process sequencing method of manufacturing features based on the node importance of a complex network. The method is based on the adjacency matrix and connected graph to analyze the process constraint semantics of the product model. The adjacency matrix expresses the positioning dimensions between features. The connected graph is applied to define the constraint relationships between features and aggregate the multi-dimensional process dimension chain in all directions. Based on the processing sequence of node importance in a complex network, most of process planning can be realized. The method also can make adaptive decisions for different structural parts and monitor the machining of key features. Examples verify the validity and feasibility of the proposed method.
CT-based MR Image Approximation using Cycle-Consistent Adversarial Networks
Cheng-Bin Jin(김성빈),Hakil Kim(김학일),Seongsu Joo(주성수),Eunsik Park(박은식),Young Saem Ahn(안영샘),In Ho Han(한인호),Jae Il Lee(이재일),Xuenan Cui(최학남) 대한전기학회 2019 대한전기학회 학술대회 논문집 Vol.2019 No.2
Computed tomography (CT) is widely used in various clinical applications. Magnetic resonance imaging (MRI) provides more anatomical details than CT for diagnostic purposes. However, the price of an MRI puts a heavy burden on low-income patients. This leads patients to undergo low-cost CT scans instead of MRIs, and this causes them to miss the opportunity for early diagnosis. To generate additional information and to increase the diagnostic value of CT, this paper proposes a method to approximate an MR image using a CT scan with the adversarial cycle-consistent networks. A novel objective function is introduced, consisting of adversarial loss, cycle-consistent loss, voxel-wise loss, gradient difference loss, and perceptual loss. Experimental results show that the proposed method significantly outperforms all baseline methods in all measurements, achieving the lowest mean absolute error and root mean square error and the highest peak-signal-to-noise-ratio, structural similarity, and Pearson correlation coefficient. This study can help the low-income patients, who cannot undergo MRI in clinical diagnosis, and patients in the developing countries where CT is the only diagnostic device.
Buckling behavior of strengthened perforated plates under shear loading
Bin Cheng,Chun Li 국제구조공학회 2012 Steel and Composite Structures, An International J Vol.13 No.4
This paper is dedicated to the buckling behaviors of strengthened perforated plates under edge shear loading, which is a typical load pattern of steel plates in civil engineering, especially in plate and box girders. The square plates considered each has a centric circular hole and is simply supported on four edges in the out-of-plane direction. Three types of strengthening stiffeners named ringed stiffener (RS), flat stiffener (FSA and FSB) and strip stiffener (SSA, SSB and SSC) are mainly discussed. The finite element method (FEM) has been employed to analyse the elastic and elasto-plastic buckling behavior of unstrengthened and strengthened perforated plates. Results show that most of the strengthened perforated plates behave higher buckling strengths than the unstrengthened ones, while the enhancements in elastic buckling stress and elastoplastic ultimate strength are closely related to stiffener types as well as plate geometric parameters including plate slenderness ratio and hole diameter to plate width ratio. The critical slenderness ratios of shear loaded strengthened perforated plates, which determine the practical buckling pattern (i.e., elastic or elasto-plastic buckling) of the plates, are also studied. Based on the contrastive analyses of strengthening efficiency considering the influence of stiffener consumption, the most efficient cutout-strengthening methods for shear loaded perforated square plates with different slenderness ratios and circular hole diameter to plate width ratios are preliminarily identified.