Research on Face Restoring in Surveillance Videos

He Peng,Dong Wen 보안공학연구지원센터 2016 International Journal of Multimedia and Ubiquitous Vol.11 No.10

Since cases being analyzed and detected by the police using surveillance videos, insufficient resolution and degradation always lead to the suspect’s face being unrecognized. For such cases, from the perspective of learning-based face super-resolution method, this paper proposed a novel face restored solution based on face super-resolution and image mosaic. Firstly, by applying global similarity selection over the entire database, the scope of the used samples can be narrowed and boost the speed. Then the local representation between neighbors can make the method more robust against noise under severe conditions. Finally the reconstructed face could be inserted into original background by the improved Poisson Editing algorithm. This scheme achieve the effect of face restoring on a single frame in surveillance videos. Experiments under common database and real surveillance video scenarios demonstrate our method has better performance, especially for noise input images.

MR 유체 입자 속도 계측을 위한 디지털 홀로그래피 현미경 시스템의 개발

( He-peng Chen ),강보선 ( B. S. Kang ) 한국액체미립화학회 2016 한국액체미립화학회지 Vol.21 No.2

In this study digital holographic microscopy system for measurements of 3-D velocities of particles in MR fluid is developed. Holograms are recorded using either a CCD camera with a double pulse laser or a high-speed camera with a continuous laser. To process recorded holograms, the correlation coefficient method is used for focal plane determination of particles. To remove noise and improve the quality of holograms and reconstructed images, a Wiener filter is adopted. The two-threshold and image segmentation methods are used for binary image transformation. For particle pairing, the match probability method is adopted. The developed system will be applied to measurements of the characteristics of unsteady 3- D particle velocities in MR fluids through the next stage of this study.

Shallow Sliding Failure Prediction Model of Expansive Soil Slope Based on Gaussian Process Theory and Its Engineering Application

Peng He,Shucai Li,Jie Xiao,Qian-qing Zhang,Fei Xu,Jian Zhang 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.5

Numerous studies on the instability and shear strength of expansive soil slopes have suggested that the fundamental reason forshallow sliding failures is insufficient shear strength caused by repeated dry-wet cycles under low stress. Therefore, this paper studiedthe effects of low stress and dry-wet cycles on the shear strength of expansive soil slopes. A nonlinear curve that can be well fittedusing generalized power functions was observed for the shear strength of expansive soil, and a numerical model with nonlinearlydistributed shear strength taken into consideration was built using FISH. In this way, the dynamic distribution of shear strength as afunction of vertical stress was obtained. Compared to conventional models, the proposed model was more accurate in terms oftheoretical aspects, and the obtained results exhibited improved consistency with the actual mode. In order to improve theapplicability of this model, a mapping model of atmospheric action and engineering design of safety factors of slopes was establishedusing a Gaussian Process Regression (GPR) model, which is suitable for cases characterized by high dimension, small samplepopulation, and nonlinearity. Herein, the numerical calculations were replaced with output responses. In this way, fast prediction ofthe stability of expansive soil slopes in terms of a shallow sliding failure prediction model was achieved. To verify the feasibility ofthe proposed approach, dynamic predictions of shallow sliding failures of expansive soil slopes were carried out for NanyouHighway under different rainfall conditions. Meanwhile, safety factor responses corresponding to different slope design schemeswere also obtained using the proposed model, providing reference for slope stability analysis in expansive soil zones.

Coring Damage Extent of Rock Cores Retrieved from High In-situ Stress Condition: A Case Study

Peng Yan,Qi He,Wenbo Lu,Yanli He,Wei Zhou,Ming Chen 대한토목학회 2017 KSCE JOURNAL OF CIVIL ENGINEERING Vol.21 No.7

The distribution of damage in deep rock cores is critical for assessing its influence on rock mechanical characteristics. This paper presents a case study on estimating the coring damage extent induced by the stress redistribution through a combined method of numerical simulation and X-ray Computed Tomography (CT) scanning. Rock cores are taken at 1900 m depth from the test tunnel at Jin-ping Second Stage Hydropower Station (JPII) in China. Firstly, the stress path experienced by the rock core during coring has been examined by the numerical simulation, and the distribution of tensile zone in the cross-section of rock core is also discussed. Then two kinds of samples, collected from the same position under different stress levels, are scanned to obtain CT images, and a special CT value analysis strategy was adopted to evaluate coring damage intensities of these samples. The result indicates that the stress state can be regarded as the principal factor for the distribution of coring damage. During coring in the Test Tunnel of JPII under the quasi-hydrostatic stress condition, high tensile stresses (over 5 MPa) are observed at the exterior edge of rock cores, which may lead to the nucleation of microcracks around the core boundary, and the coring damage then propagates to the core centre. The CT scanning also illustrates that the coring damage zone may cover approximately 70~80% of the entire cross-section from the outside inside (stress level of 50 MPa), and that the central part of the core is less damaged or eventually undisturbed. Thus, intact rock samples can be expected to be obtained by overcoring the original rock cores. However, the applicability of the overcoring method seems to be largely dependent on the state of in-situ stress at the coring site. The whole core may be damaged if the lateral stress coefficient reaches a critical value (e.g. greater than 3.0), in which case a special coring equipment should be adopted to improve the stress state during coring.

Long-term dam behavior prediction with deep learning on graphs

He Peng,Pan Jianbo,Li Yueyang 한국CDE학회 2022 Journal of computational design and engineering Vol.9 No.4

Dam displacement prediction is one of the most crucial considerations for ensuring the dam’s long-term safe operation. Most existing models focus on predicting individual displacement and ignore the spatial and temporal correlation of data. To address these issues, a novel prediction model based on attention mechanism and graph convolutional network is proposed. To extract the spatial and temporal correlation of the original data, the position embedding and aggregation modules are employed in the prediction model. Through the aggregation module, a spatial-temporal graph is constructed. The spatial-temporal chart connects spatial diagrams of different time steps together. To capture the spatial-temporal features in the constructed graph, a recurrent graph convolutional module is employed. Through the recurrent graph convolutional module, the spatial-temporal features are used to predict the dam displacement. For verification, an arch dam is taken as an example. Comparing eight baseline models, the proposed model is more effective than other prediction models. Therefore, the proposed model can be adapted for engineering applications.

Analytical modeling of axial stiffness of tensile bolted joints under concentric external load

Peng He,Jiaxin Liu,Chengyuan Zhang,Zhansheng Liu 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.11

Stiffness of bolted joints is a critical parameter for determining deformations and natural frequencies of assemblies. In this study, the effect of external load on axial stiffness of bolted joints is clarified theoretically for the first time. The stiffness of stress zones between and beyond load planes is derived on the basis of the strain energy method and used to formulate the stiffness of bolted joints. The influence of the distance between the load planes of the external load, axial positions of the external load, and difference in the material of the clamped parts on the stiffness of the bolted joints are investigated by applying the proposed formulations and finite element method. Comparisons with finite element results indicate that the proposed formulation can accurately predict the stiffness of the bolted joints.

Finite-time Dynamic Surface Fault-tolerant Control for Hypersonic Vehicle with Mismatched Disturbances

Peng Li,Peng Huang,Chen-Yu He,Xiao-Qing Liu 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.7

This paper studies the tracking control problem of hypersonic vehicle in the process of external disturbance, parameters uncertainties and actuator faults. Firstly, a non-triangular velocity and altitude nonlinear subsystem with mismatched disturbances and actuator faults are established based on the feedback linearization model. Secondly, adaptive dynamic surface fault-tolerant controllers are designed for velocity and altitude subsystems by combining nonlinear filter, adaptive control and back-stepping method. Finally, the Lyapunov stability theory and numercial simulation are carried out to verify the availability of the proposed control strategy.

Review of the Molecular Pathogenesis of Osteosarcoma

He, Jin-Peng,Hao, Yun,Wang, Xiao-Lin,Yang, Xiao-Jin,Shao, Jing-Fan,Guo, Feng-Jin,Feng, Jie-Xiong Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.15

Treating the osteosarcoma (OSA) remains a challenge. Current strategies focus on the primary tumor and have limited efficacy for metastatic OSA. A better understanding of the OSA pathogenesis may provide a rational basis for innovative treatment strategies especially for metastases. The aim of this review is to give an overview of the molecular mechanisms of OSA tumorigenesis, OSA cell proliferation, apoptosis, migration, and chemotherapy resistance, and how improved understanding might contribute to designing a better treatment target for OSA.

Incorporating Energy-Aware Mechanism into Workflow Scheduling Policy in Heterogeneous Distributed Systems

Hong He,Peng Xiao 보안공학연구지원센터 2014 International Journal of Grid and Distributed Comp Vol.7 No.6

In the past decades, plenty scheduling policies have been proposed for improving the execution performance of workflow applications. However, few of them have addressed the issue of energy conservation. In this paper, a novel scheduling metric, namely Minimal Energy Consumption Path, is introduced to reducing the energy consumption when scheduling large-scale workflows. The proposed scheduling metric can be incorporated into current schedulers so as to enhance their capability of energy conservation as well as maintain their scheduling performance. A lot of experiments are performed by using different scheduler and experimental settings to evaluate the proposed scheduling metric and the results indicate it is effective for reducing the storage-related energy consumption, especially when the target workflows are data-intensive.

애시드(Acid) 스타일을 활용한 포스터 디자인에 나타난 시각적 표현 연구 -중국 일렉트로닉 뮤직 포스터 사례를 중심으로-

펑첸허(Peng, Qian He),김은정(Kim, Un Chong) 한국일러스아트학회 2023 조형미디어학 Vol.26 No.3