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| 1 | Spatial distribution and pollution assessment of heavy metals in urban soils from southwest China显示文摘To identify the concentrations and sources of heavy metals, and to assess soil environmental quality, 63 soil samples were collected in Yibin City, Sichuan Province, China. Mean concentrations of As, Pb, Zn, and Cu were 10.55, 61.23, 138.88 and 56.35 mg/kg, respectively. As concentrations were comparable to background values, while Pb, Zn, and Cu concentrations were higher than their corresponding background values. Industrial areas exhibited the highest concentrations of As, Pb, Zn, and Cu, while the lowest concentrations occurred in parks. Statistical analysis was performed and two cluster groups of metals were identified with Pb, Zn, and Cu in one group and As in the other. Spatial distribution maps indicated that Pb, Zn, and Cu were mainly controlled by anthropogenic activities, whereas As could be mainly accounted for by soil parent materials. Pollution index values of As, Pb, Zn, and Cu varied in the range of 0.24-1.93, 0.66-7.24, 0.42-4.19, and 0.62-5.25, with mean values of 0.86, 1.98, 1.61, and 1.78, respectively. The integrated pollution index (IPI) values of these metals varied from 0.82 to 3.54, with a mean of 1.6 and more than 90% of soil samples were moderately or highly contaminated with heavy metals. The spatial distribution of IPI showed that newer urban areas displayed relatively lower heavy metal contamination in comparison with older urban areas. | Guanghui Guo Fengchang Wu Fazhi Xie Ruiqing Zhang | 2012 | Journal of Environmental Sciences2012，24，3： | 86 |
| 2 | Real-time object tracking via compressive feature selection显示文摘 | Kang LI Fazhi HE Xiao CHEN | 2016 | Frontiers of Computer Science2016，10，4： | 14 |
| 3 | Efficient random saliency map detection显示文摘Most image retargeting algorithms rely heavily on valid saliency map detection to proceed. However, the inefficiency of high quality saliency map detection severely restricts the application of these image retargeting methods. In this paper, we propose a random algorithm for efficient context-aware saliency map detection. Our method is a multiple level saliency map detection algorithm that integrates multiple level coarse saliency maps into the resulting saliency map and selectively updates unreliable regions of the saliency map to refine detection results. Because of the randomized search, our method requires very little additional memory beyond that for the input image and result map, and does not need to build auxiliary data structures to accelerate the saliency map detection. We have implemented our algorithm on a GPU and demonstrated the performance for a variety of images and video sequences, compared with state-of-the-art image processing. | HUANG ZhiYong HE FaZhi CAI XianTao ZOU ZhengQin LIU Jing LIANG MingMing & CHEN Xiao | 2011 | Science China(Information Sciences)2011，54，6： | 11 |
| 4 | A Trusted Attestation Mechanism for the Sensing Nodes of Internet of Things Based on Dynamic Trusted Measurement显示文摘Internet of things has been widely applied to industrial control, smart city and environmental protection, in these application scenarios, sensing node needs to make real-time response to the feedback control of the application layer. Therefore, it is necessary to monitor whether or not awareness nodes are trusted in real time, but the existing mechanisms for trusted certification lack the real-time measurement and tracking of the sensing node. To solve the above problems,this paper proposes a dynamic metric based authentication mechanism for sensing nodes of Internet of things. Firstly, the dynamic trustworthiness measure of the sensing nodes is carried out by introducing the computational function such as the trust function, the trustworthiness risk assessment function, the feedback control function and the active function of the sensing node. The dynamic trustworthiness measure of sensing nodes from multiple dimensions can effectively describe the change of trusted value of sensing nodes. Then, on the basis of this, a trusted attestation based on node trusted measure is realized by using the revocable group signature mechanism of local verifier. The mechanism has anonymity, unforgeability and traceability, which is proved the security in the standard model. Simulationexperiments show that the proposed trusted attestation mechanism is flexible, practical and efficient and has better attack resistance. It can effectively guarantee the reliable data transmission of nodes and realize the dynamic tracking of node reliability, which has a lower impact on system performance. | Bei Gong Yubo Wang Xiangang Liu Fazhi Qi Zhihui Sun | 2018 | China Communications2018，15，2： | 10 |
| 5 | Consistency Maintenance in Collaborative CAD Systems显示文摘 | LIU Huajun HE Fazhi ZHU Fuxi ZHU Qing | 2013 | Chinese Journal of Electronics2013，22，1： | 4 |
| 6 | Exchange-Biased NiFe_(2)O_(4)/NiO Nanocomposites Derived from NiFe-Layered Double Hydroxides as a Single Precursor显示文摘NiFe_(2)O_(4) nanoparticles(<10 nm)embedded in a NiO matrix have been fabricated by calcining the corresponding Ni^(Ⅱ)Fe^(Ⅲ)-layered double hydroxide(LDH)precursors at high temperature(500℃).Compared with the NiFe_(2)O_(4)/NiO nanocomposite obtained by calcination of a precursor prepared by a traditional chemical coprecipitation method,those derived from NiFe-LDH precursors show much higher blocking temperatures(TB)(~380 K).The enhanced magnetic stability can be ascribed to the much stronger interfacial interaction between NiFe_(2)O_(4) and NiO phases due to the topotactic nature of the transformation of the LDH precursor to the NiFe_(2)O_(4)/NiO composite material.Through tuning the Ni^(Ⅱ)/Fe^(Ⅲ) molar ratio of the NiFe-LDH precursor,the NiFe_(2)O_(4) concentration can be precisely controlled,and the TB value as well as the magnetic properties of the final material can also be regulated.This work represents a successful example of the fabrication of ferro(ferri)magnetic(FM)/antiferrimagnetic(AFM)systems with high magnetic stability from LDH precursors.This method is general and may be readily extended to other FM/AFM systems due to the wide range of available LDH precursors. | Xiaofei Zhao Sailong Xu Lianying Wang Xue Duan Fazhi Zhang | 2010 | Nano Research2010，3，3： | 4 |
| 7 | A semi-transparent selective undo algorithm for multi-user collaborative editors显示文摘Multi-user collaborative editors are useful computer-aided tools to support human-to-human collaboration.For multi-user collaborative editors,selective undo is an essential utility enabling users to undo any editing operations at any time.Collaborative editors usually adopt operational transformation(OT)to address concurrency and consistency issues.However,it is still a great challenge to design an efficient and correct OT algorithm capable of handling both normal do operations and user-initiated undo operations because these two kinds of operations can interfere with each other in various forms.In this paper,we propose a semi-transparent selective undo algorithm that handles both do and undo in a unified framework,which separates the processing part of do operations from the processing part of undo operations.Formal proofs are provided to prove the proposed algorithm under the well-established criteria.Theoretical analysis and experimental evaluation are conducted to show that the proposed algorithm outperforms the prior OT-based selective undo algorithms. | Weiwei CAI Fazhi HE Xiao LV Yuan CHENG | 2021 | Frontiers of Computer Science2021，15，5： | 3 |
| 8 | A parallel and robust object tracking approach synthesizing adaptive Bayesian learning and improved incremental subspace learning显示文摘This paper presents a novel tracking algorithm which integrates two complementary trackers. Firstly, an improved Bayesian tracker(B-tracker) with adaptive learning rate is presented. The classification score of B-tracker reflects tracking reliability, and a low score usually results from large appearance change. Therefore, if the score is low, we decrease the learning rate to update the classifier fast so that B-tracker can adapt to the variation and vice versa. In this way, B-tracker is more suitable than its traditional version to solve appearance change problem. Secondly, we present an improved incremental subspace learning method tracker(Stracker). We propose to calculate projected coordinates using maximum posterior probability, which results in a more accurate reconstruction error than traditional subspace learning tracker. Instead of updating at every time, we present a stopstrategy to deal with occlusion problem. Finally, we present an integrated framework(BAST), in which the pair of trackers run in parallel and return two candidate target states separately. For each candidate state, we define a tracking reliability metrics to measure whether the candidate state is reliable or not, and the reliable candidate state will be chosen as the target state at the end of each frame. Experimental results on challenging sequences show that the proposed approach is very robust and effective in comparison to the state-of-the-art trackers. | Kang LI Fazhi HE Haiping YU Xiao CHEN | 2019 | Frontiers of Computer Science2019，13，5： | 3 |
| 9 | Dynamic strategy based parallel ant colony optimization on GPUs for TSPs显示文摘Metaheuristics are a type of approximate optimization algorithms for solving hard and complex problems in science and engineering[1].They can be defined as algorithm templates that can be easily adapted to solve specific optimization problems.Motivated by search behavior,most researchers divide metaheuristics into two classes:trajectory-based and population-based[1]. | Yi ZHOU Fazhi HE Yimin QIU | 2017 | Science China(Information Sciences)2017，60，6： | 3 |
| 10 | A correlative denoising autoencoder to model social influence for top-N recommender system显示文摘In recent years,there are numerous works been proposed to leverage the techniques of deep learning to improve social-aware recommendation performance.In most cases,it requires a larger number of data to train a robust deep learning model,which contains a lot of parameters to fit training data.However,both data of user ratings and social networks are facing critical sparse problem,which makes it not easy to train a robust deep neural network model.Towards this problem,we propose a novel correlative denoising autoencoder(CoDAE)method by taking correlations between users with multiple roles into account to learn robust representations from sparse inputs of ratings and social networks for recommendation.We develop the CoDAE model by utilizing three separated autoencoders to learn user features with roles of rater,truster and trustee,respectively.Especially,on account of that each input unit of user vectors with roles of truster and trustee is corresponding to a particular user,we propose to utilize shared parameters to learn common information of the units that corresponding to same users.Moreover,we propose a related regularization term to learn correlations between user features that learnt by the three subnetworks of CoDAE model.We further conduct a series of experiments to evaluate the proposed method on two public datasets for Top-N recommendation task.The experimental results demonstrate that the proposed model outperforms state-of-the-art algorithms on rank-sensitive metrics of MAP and NDCG. | Yiteng PAN Fazhi HE Haiping YU | 2020 | Frontiers of Computer Science2020，14，3： | 3 |
| 11 | A Novel Attribute-Based Encryption Approach with Integrity Verification for CAD Assembly Models显示文摘Cloud manufacturing is one of the three key technologies that enable intelligent manufacturing.This paper presents a novel attribute-based encryption(ABE)approach for computer-aided design(CAD)assembly models to effectively support hierarchical access control,integrity verification,and deformation protection for co-design scenarios in cloud manufacturing.An assembly hierarchy access tree(AHAT)is designed as the hierarchical access structure.Attribute-related ciphertext elements,which are contained in an assembly ciphertext(ACT)file,are adapted for content keys decryption instead of CAD component files.We modify the original Merkle tree(MT)and reconstruct an assembly MT.The proposed ABE framework has the ability to combine the deformation protection method with a content privacy of CAD models.The proposed encryption scheme is demonstrated to be secure under the standard assumption.Experimental simulation on typical CAD assembly models demonstrates that the proposed approach is feasible in applications. | Yueting Yang Fazhi He Soonhung Han Yaqian Liang Yuan Cheng | 2021 | Engineering2021，7，6： | 3 |
| 12 | Effect of high-voltage thermal breakdown on pore characteristics of coal显示文摘High-voltage thermal breakdown has great potential application in permeability enhancement of coal seam. The characteristics of the breakdown channel, coal element, porosity and microscopic coal petrography of coal under high-voltage electric load were experimentally studied. The coal interior left apparent tracks due to electric current burning with high temperature. The percentage of C, O, Al, Fe, and Si had slightly decreased, while the content of element N increased obviously. Low-pressure nitrogen gas adsorption(LP-N_2GA) and mercury intrusion analysis showed that coal porosity increased. The increases of micropores and mesopores are beneficial to promotion of the ability of gas storage, and the increase of macropores could enhance the gas seepage and migration. The results of scanning electron microscope(SEM) show that there are many exogenous fractures in coal, which is also beneficial to gas seepage and migration. The results lay a theoretical foundation for application of high-voltage thermal breakdown in coal mines. | Zhu Chuanjie Lu Ximiao Gao Zishan Yan Fazhi Guo Chang Zhang Xiangliang | 2017 | International Journal of Mining Science and Technology2017，27，6： | 2 |
| 13 | The Principle of Introducing Halogen Ions Into β-FeOOH: Controlling Electronic Structure and Electrochemical Performance显示文摘Coordination tuning electronic structure of host materials is a quite effective strategy for activating and improving the intrinsic properties.Herein,halogen anion(X-)-incorporated β-FeOOH(β-FeOOH(X),X=F-,Cl-,and Br-) was investigated with a spontaneous adsorption process,which realized a great improvement of supercapacitor performances by adjusting the coordination geometry.Experiments coupled with theoretical calculations demonstrated that the change of Fe-O bond length and structural distortion of β-FeOOH,which is rooted in halogen ions embedment,led to the relatively narrow band gap.Because of the strong electronegativity of X-,the Fe element in β-FeOOH(X)s presented the unexpected high valence state(3+δ),which is facilitating to adsorb S032-species.Consequently,the designed β-FeOOH(X)s exhibited the good electric conductivity and enhanced the contact between electrode and electrolyte.When used as a negative electrode,the β-FeOOH(F) showed the excellent specific capacity of 391.9 F g-1 at 1 A g-1 current density,almost tenfold improvement compared with initial β-FeOOH,with the superior rate capacity and cyclic stability.This combinational design principle of electronic structure and electrochemical performances provides a promising way to develop advanced electrode materials for supercapacitor. | Dongbin Zhang Xuzhao Han Xianggui Kong Fazhi Zhang Xiaodong Lei | 2020 | Nano-Micro Letters2020，12，9： | 2 |
| 14 | Tracking topological entity changes in 3D collaborative modeling systems显示文摘One of the key problems in collaborative geometric modeling systems is topological entity correspondence when topological structure of geometry models on collaborative sites changes.In this article,we propose a solution for tracking topological entity alterations in 3D collaborative modeling environment.We firstly make a thorough analysis and detailed categorization on the alteration properties and causations for each type of topological entity,namely topological face and topological edge.Based on collaborative topological entity naming mechanism,a data structure called TEST (Topological Entity Structure Tree) is introduced to track the changing history and current state of each topological entity,to embody the relationship among topological entities.Rules and algorithms are presented for identification of topological entities referenced by operations for correct execution and model consistency.The algorithm has been verified within the prototype we have implemented with ACIS. | Cheng Yuan He Fazhi Huang Zhiyong Cai Xiantao Zhang Dejun | 2012 | Computer Aided Drafting,Design and Manufacturing2012，22，1： | 2 |
| 15 | Real-time control of human actions using inertial sensors显示文摘Our study proposes a new local model to accurately control an avatar using six inertial sensors in real-time.Creating such a system to assist interactive control of a full-body avatar is challenging because control signals from our performance interfaces are usually inadequate to completely determine the whole body movement of human actors.We use a pre-captured motion database to construct a group of local regression models,which are used along with the control signals to synthesize whole body human movement.By synthesizing a variety of human movements based on actors’control in real-time,this study verifies the effectiveness of the proposed system.Compared with the previous models,our proposed model can synthesize more accurate results.Our system is suitable for common use because it is much cheaper than commercial motion capture systems. | LIU HuaJun HE FaZhi ZHU FuXi ZHU Qing | 2014 | Science China(Information Sciences)2014，57，7： | 2 |
| 16 | An efficient GPU-based parallel tabu search algorithm for hardware/software co-design显示文摘Hardware/software partitioning is an essential step in hardware/software co-design.For large size problems,it is difficult to consider both solution quality and time.This paper presents an efficient GPU-based parallel tabu search algorithm(GPTS)for HW/SW partitioning.A single GPU kernel of compacting neighborhood is proposed to reduce the amount of GPU global memory accesses theoretically.A kernel fusion strategy is further proposed to reduce the amount of GPU global memory accesses of GPTS.To further minimize the transfer overhead of GPTS between CPU and GPU,an optimized transfer strategy for GPU-based tabu evaluation is proposed,which considers that all the candidates do not satisfy the given constraint.Experiments show that GPTS outperforms state-of-the-art work of tabu search and is competitive with other methods for HW/SW partitioning.The proposed parallelization is significant when considering the ordinary GPU platform. | Neng Hou Fazhi He Yi Zhou Yilin Chen | 2020 | Frontiers of Computer Science2020，14，5： | 2 |
| 17 | In situ growth of layered double hydroxide films on anodic aluminum oxide/aluminum and its catalytic feature in aldol condensation of acetone显示文摘 | Lü Zhi Zhang Fazhi Lei Xiaodong | 2008 | Chem Eng Sci2008，63，16： | 1 |
| 18 | Highly crystalline activated layered double hydroxides as solid acid-base catalysts显示文摘 | Lei Xiaodong Zhang Fazhi Yang Lan | 2007 | AIChE J2007，53，4： | 1 |
| 19 | Controllable magnetic properties of cobalt ferrite particles derived from layered double hydroxide precursors显示文摘Cobalt ferrite Co x Ni 1-x Fe 2 O 4 (x = 0, 0.5, 1) particles with controllable magnetic properties have been pre- pared by calcination of co-substituted NiFe 2+ Fe 3+ -layered double hydroxide (NiFe 2+ Fe 3+ -LDH) precursors prepared via a scalable method involving separate nucleation and aging steps (SNAS). Their structural and magnetic characteristics were investigated by powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and vibrating sample magnetometry (VSM). Measurements of magnetic properties show that the saturation magnetization (M s ) and coercivity (H c ) of the calcined products increased with increasing cobalt content. The LDH precursor-based product obtained by calcination of a mixture of CoFe 2+ Fe 3+ -LDH and NiFe 2+ Fe 3+ -LDH powders with a Co/Ni molar ratio of 1:1, exhibits a moderate value of M s and an increased value of H c compared to the corresponding values for an Ni 0.5 Co 0.5 Fe 2 O 4 material prepared by calcination of a Co 0.5 Ni 0.5 Fe 2+ Fe 3+ -LDH precursor, and a physical mixture of CoFe 2 O 4 and NiFe 2 O 4 with a Co/Ni molar ratio of 1:1. These results may provide a way to regulate magnetic anisotropy of ferrite spinels by varying the composition of the LDH precursors. | Yonglian Qi Yingsheng Yang Xiaofei Zhao Xilan Liu Peng Wu Fazhi Zhang Sailong Xu | 2010 | Particuology2010，8，3： | 1 |
| 20 | Computer-aided Tool for Collaborative Integrated Design Environments显示文摘 | He Fazhi Wang Shaomei Sun Guozheng | 2002 | Journal of Mechanical Engineering2002，38，6： | 1 |
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