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An auto-encoder-based summarization algorithm for unstructured videos

MULTIMEDIA TOOLS AND APPLICATIONS 2017年第23期76卷 25039-25056页

作者： Han, Meng-Xiong Hu, Hai-Miao Liu, Yang Zhang, Chi Tian, Rong-Peng Zheng, Jin Beihang Univ Sch Comp Sci & Engn Beijing Key Lab Digital Media Beijing 100083 Peoples R China Beijing Inst Graph Beijing 100029 Peoples R China Beihang Univ Digital Media Lab Beijing Peoples R China

Video summarization is an effective way to quick view videos and relieve the pressure of videos storage. However the traditional algorithms are hardly adapted to unstructured videos, due to the unobvious for scenes changing and ignoring the structure of the videos. Therefore, an Auto-encoder-based summarization algorithm is proposed in this paper for unstructured videos. Each video structure is detected by an Auto-encoder and both of the interestingness and representativeness of each video segment are predicted by the reconstruction errors of the segment. Meanwhile, most interesting and representative summarization is generated with the limited summary length. The experimental results show that the proposed algorithm obtained a better performance by comparing with the state-of-the-art.

关键词： Video summarization Auto-encoder Video analysis

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Cloning and characterization of pyruvate carboxylase gene responsible for calcium malate overproduction in Penicillium viticola 152 and its expression analysis

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GENE 2017年 605卷 81-91页

作者： Khan, Ibrar Qayyum, Sadia Ahmed, Shehzad Maqbool, Farhana Tauseef, Isfahan Haleem, Kashif Syed Chi, Zhen-Ming Hazara Univ Dept Microbiol Mansehra 21300 Pakistan Ocean Univ China UNESCO Chinese Ctr Marine Biotechnol Qingdao 266003 Peoples R China

In this study, a pyruvate carboxylase gene (PYC) from a marine fungus Penicillium viticola 152 isolated from marine algae was cloned and characterized by using Genome Walking method. An open reading frame (ORF) of The PYC gene (accession number: KM593097) had 3582 bp encoding 1193 amino acid protein (isoelectric point: 5.01) with a calculated molecular weight of 131.2757 kDa. A putative promoter (intronless) of the gene was located at 666 bp and contained a TATA box, several CAAT boxes, the 5'-5YGGRG-3' and a 5'-HGATAR-3' sequences. A consensus polyadenylation site (AATAAA) was also observed at + 10 bp downstream of the ORF. The protein deduced from the PYC gene had no signal peptide, was a homotetramer (4), and had the four functional domains. Furthermore, PYC protein also had three potential N-linked glycosylation sites, among them, -N5-T-1- at 36 amino acid, -N-G-T-V- at 237 amino acid, and -N-G-S-S- at 517 amino acid were the most possible N-glycosylation sites. After expression of the PYC gene of P. viticola 152 in medium supplemented with CSL and biotin, it was found that the specific pyruvate carboxylase activity in MA production medium supplemented with CSL was much higher (0.5 U/mg) than in MA medium supplemented with biotin (0.3 U/mg), suggesting that optimal concentration of CSL is required for increased expression of the PYC gene, which is responsible for high level production of malic acid in P. viticola 152 strain. (C) 2016 Elsevier B.V. All rights reserved.

关键词： Pyruvate carboxylase Genome walking Calcium malate Biotin Corn steep liquor Penicillium viticola 152

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Experimental investigation of the phase fraction of wet gas based on convective heat transfer

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APPLIED THERMAL ENGINEERING 2017年 110卷 102-110页

作者： Yuan, Chao Xu, Ying Zhang, Tao Wang, Jiaojiao Wang, Huaxiang Ding, Zhixin Tianjin Univ Sch Elect Engn & Automat Tianjin 300072 Peoples R China Tianjin Key Lab Proc Measurement & Control Tianjin 300072 Peoples R China PetroChina Tarim Oilfield Co Korla 841000 Peoples R China

In the present stage, wet gas measurement is playing an increasingly significant role in the oil and gas industry. Phase fraction is an important parameter for the determination of pressure drop and heat transfer coefficient in wet gas flow. In this paper, experimental investigations of the wet gas phase fraction based on convective heat transfer (CHT) is conducted. In order to describe the "over reading" of CHT coefficient due to the existence of the liquid phase, it is innovative to define omega as the ratio of the CHT coefficients of wet gas and gas alone. An easy-to-use correlation is proposed by using the gas flow rate and the temperature measured before and after the electrical heating belt. The experiment was carried out in the wet gas flow loop in Tianjin University. System pressure ranges from 0.6 MPa to 1.2 MPa, and gas mass fraction (GMF) is from 23.8% to 100%. Final results show that the relative deviation of all data points are less than +/- 15%. There is no doubt that this correlation provides new data on the phase fraction in wet gas annular flow and benefits other researchers in wet gas measurement. (C) 2016 Elsevier Ltd. All rights reserved.

关键词： Annular flow Convective heat transfer Dimensional analysis Phase fraction Wet gas

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A novel topology optimization method of welded box-beam structures motivated by low-carbon manufacturing concerns

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JOURNAL OF CLEANER PRODUCTION 2017年 142卷 2792-2803页

作者： Li, Baotong Hong, Jun Liu, Zhifeng Xi An Jiao Tong Univ Sch Mech Engn State Key Lab Mfg Syst Engn Xian 710049 Peoples R China Hefei Univ Technol Sch Mech & Automot Engn Hefei 230009 Peoples R China

This paper proposes a simple and effective topology optimizer to get the best-possible layout scheme of welded box-beam structures that emit less greenhouse gases (GHGs) in manufacturing stage than has been common practice. Firstly, a cradle-to-gate approach is adopted to identify the relationship between the GHGs emission of welded box beams in manufacturing stage and the variables of topology optimization (thickness and coordinates of the stiffener plates). Then, a low-carbon design framework is built to realize the simultaneous handling of GHGs emission reduction and structure layout reconfiguration. Unlike the conventional optimization methods, the proposed method releases more flexibility in representing geometry and topology change during the optimization procedure. As a result, stiffener plates are allowed to move freely within the box beams so as to form a global optimized layout solution. The proposed method is finally applied to the re-design of a welded sliding beam of the hydraulic press machine, on which the numerical analyses conducted exemplify the GHGs emission reduction and structural performance enhancement, and therefore is a good choice for the low-carbon design of large-scale welded engineering structures. (C) 2016 Elsevier Ltd. All rights reserved.

关键词： Low-carbon design Greenhouse gases (GHGs) Welded box beam Topology optimization

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Sorption of cadmium onto Mg-Fe Layered Double Hydroxide (LDH)-Kiwi branch biochar

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ENVIRONMENTAL POLLUTANTS AND BIOAVAILABILITY 2019年第1期31卷 189-197页

作者： Tan, Yuehui Yin, Xianqiang Wang, Caiyun Sun, Huimin Ma, Aisheng Zhang, Guilong Wang, Nong Northwest A&F Univ Coll Nat Resources & Environm Yangling Shaanxi Peoples R China Minist Agr Key Lab Plant Nutr & Agrienvironm Northwest China Yangling Shaanxi Peoples R China Minist Agr Agroenvironm Protect Inst Tianjin Peoples R China

The Cd(II) adsorption of kiwi biochar functionalized with Mg-Fe (3:1) layered double hydroxides (LDH) was studied. And the biochar was got via liquid-phase deposition, by incorporating Mg-Fe layered double hydroxide (Mg-Fe LDH) particles into kiwi biochar (KB/LDH). The batch of sorption experiments were studied, including adsorption kinetics and isotherm and the effects of pH, ion strength (IS) and co-existing ions. The KB/LDH composite showed a strong sorption ability to Cd(II) in aqueous solutions with the adsorption capacity of 25.6 mg g(-1), compared with pristine biochar of 1.78 mg g(-1). The adsorption of Cd(II) on KB/LDH composite increased with the decreasing of IS, decreased first and then grew larger with the increase of pH and was observed irrespective of the co-existence of K+, Cl- and NO3-. To sum up, the KB/LDH can be potentially used as an alternative adsorbent to amend the water and soil contaminated by Cd(II).

关键词： Kiwi characterization modified biochar layered double hydroxides Cd(II)

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Fragmentation Energy-Saving Theory of Full Face Rock Tunnel Boring Machine Disc Cutters

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Chinese Journal of Mechanical Engineering 2017年第4期30卷 913-919页

作者： Zhao-Huang Zhang Guo-Fang Gong Qing-Feng Gao Fei Sun School of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBeijing 102206China State Key Laboratory of Fluid Power Transmission and Control Zhejiang UniversityHangzhou 310027China School of Foreign Languages North China Electric Power UniversityBeijing 102206China

Attempts to minimize energy consumption of a tunnel boring machine disc cutter during the process of fragmentation have largely focused on optimizing disc- cutter spacing, as determined by the minimum specific energy required for fragmentation; however, indentation tests showed that rock deforms plastically beneath the cutters. Equations for thrust were developed for both the traditional, popularly employed disc cutter and anew design based on three-dimensional theory. The respective energy consumption for penetration, rolling, and side-slip fragmentations were obtained. A change in disc-cutter fragmentation angles resulted in a change in the nature of the interaction between the cutter and rock, which lowered the specific energy of fragmentation. During actual field excavations to the same penetration length, the combined energy consumption for fragmentation using the newly designed cutters was 15% lower than that when using the traditional design. This paper presents a theory for energy saving in tunnel boring machines. Investigation results showed that the disc cutters designed using this theory were more durable than traditional designs, and effectively lowered the energy consumption.

关键词： Newly design Disc cutter Fragmentation Specific energy Energy consumption

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On-Road Vehicle Trajectory Collection and Scene-Based Lane Change Analysis: Part I

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IEEE TRANSACTIONS ON INTELLIGENT TRANSPORTATION SYSTEMS 2017年第1期18卷 192-205页

作者： Zhao, Huijing Wang, Chao Lin, Yuping Guillemard, Franck Geronimi, Stephane Aioun, Francois Peking Univ Minist Educ Key Lab Machine Percept Beijing 100871 Peoples R China PSA Peugeot Citroen Grp PSA Peugeot Soc Anonyme F-78943 Velizy Villacoublay France

This two-part paper aims to study lane change behaviors at the tactical level from an on-road perspective, with a special focus on analyzing the interactions between an ego and surrounding vehicles during the procedure. Part I addresses vehicle trajectory collection, whereas Part II addresses lane change extraction and scene-based behavioral analysis. Different from the general technique of moving object detection and tracking, trajectory collection for tactical driving behavior study is required to have the properties of consistency, completeness, continuity, and accuracy. This paper proposes a system of on-road vehicle trajectory collection, where an instrumented vehicle is developed with multiple horizontal 2-D lidars that have 360. coverage. The software is developed by fitting the laser points of all lidars on a vehicle model using a coupled estimation of features and reliability along frames to achieve accurate state estimations of occluded data and robust data association in multiviewpoint sensing. The performance is investigated extensively, and a large trajectory set is developed through on-road driving at the Fourth Ring Road in Beijing for a total distance of 64 km, with more than 5700 environmental trajectories with a total length of over 19 h. The performance is demonstrated to be of high quality in terms of the required properties. To the authors' knowledge, this is the first system that is able to automatically collect all-around vehicle trajectories during on-road driving and to demonstrate good performance in providing a high-quality database for driving behavior studies from an on-road perspective that addresses vehicle interactions in real-world traffic at the trajectory level.

关键词： Lidar processing on-road tactical driving behavior trajectory collection vehicle

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Enhanced removal performance of estriol by a three-dimensional electrode reactor

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CHEMICAL ENGINEERING JOURNAL 2017年 327卷 597-607页

作者： Shen, Bo Wen, Xiang-hua Huang, Xia Tsinghua Univ Sch Environm Environm Simulat & Pollut Control State Key Joint Beijing 100084 Peoples R China

This study dealt with the treatment of estriol (E3), a typical endocrine disrupting chemical (EDC), using a three-dimensional (3D) electrode reactor (TDER). The reaction rate per unit area of TDER in batch mode was 3.23-5.75 times that of a conventional two-dimensional (2D) electrode reactor, while its energy consumption was only 1/7-1/5 of that of the latter. The kinetics analysis results indicated that the degradation of E3 in both systems followed pseudo first-order kinetics. The effects of initial E3 concentration, current density, electrode distance, and recirculation flow rate on the performance of TDER were investigated in batch mode. A current density of 1.0 mA/cm(2), electrode distance of 2 cm, and recirculation flow rate of 200 mL/min were identified as optimal operating parameters that could guarantee excellent E3 removal efficiency and energy consumption. Progesterone and 3a-hydroxy-5a-androstane-17-one were identified by UPLC/MS/MS and GC/MS for the first time as E3 degradation intermediates. A possible E3 degradation pathway was proposed based on the intermediates and the results of previous studies. The mechanism analysis results identified indirect oxidation as the main contributor to E3 degradation in batch TDER, with the repolarization of particle electrodes contributing to the degradation. Subsequently, TDER was operated in continuous-flow mode to treat a secondary effluent spiked with E3. With a hydraulic retention time of 50 min and a current density of 20 mA/cm2, TDER achieved an E3 removal efficiency of 80%, thereby demonstrating the ability of continuous-flow TDER to produce a stable, high quality effluent. The aforementioned results highlighted 3D electrolysis as a promising alternative method for removing trace EDCs from secondary effluent in pretreatment or advanced treatment applications. (C) 2017 Elsevier B.V. All rights reserved.

关键词： Particle electrodes Three-dimensional electrode reactor (TDER) Endocrine disrupting chemicals (EDCs) Degradation intermediates Secondary effluent

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Generative design method for lattice structure with hollow struts of variable wall thickness

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ADVANCES IN MECHANICAL ENGINEERING 2018年第3期10卷

作者： Wang, Yedong Jing, Shikai Liu, Yonghui Song, Guohua Qie, Longfei Xing, Hao Beijing Inst Technol Sch Mech Engn 5 South Zhongguancun St Beijing 100081 Peoples R China Haier Grp Tech R&D Ctr Qingdao Shandong Peoples R China

Additive manufacturing technology can make products of arbitrary shapes, greatly expanding the design space of lattice structures. Compared with traditional solid lattice structures, the lattice structures with hollow struts have higher flexural strength, which arouses interests of designers recently. However, owing to the more complex shapes of structures, the model generation and design are facing more challenges. In this article, a novel generative design method for the creation of lattice structures with hollow struts is proposed. This method consists of three stages: initialization, analysis, and optimization. First of all, a ground structure is generated automatically based on initial conditions. Then, the finite element analysis is used to get the stress and coordinate information of finite element nodes as well as deformation information of the ground structure. At last, a rapid optimization method is presented based on the idea of mapping the strut equivalent stress to the strut wall thickness to optimize materials distribution. The proposed method is validated through a case study, demonstrating that this method can enhance performance of products while reducing the complexity of the optimization problem.

关键词： Generative design hollow struts lattice structure optimization additive manufacturing

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On the Performance of Distributed Space-Time Coding with Selection Relaying and Beamforming for Two-Path Successive Relay Network

On the Performance of Distributed Space-Time Coding with Sel...

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5th IEEE International Black Sea Conference on Communications and Networking (IEEE BlackSeaCom)

作者： Gilan, Mahsa Shirzadian Olfat, Ali Univ Tehran Sch Elect & Comp Engn Signal Proc & Commun Syst Lab Tehran Iran

ISBN: (纸本)9781509050499

Two-path successive relaying is used as a method of transmission for recovering the bandwidth loss of conventional relay networks. In this paper, a new beamforming method is employed alongside the proposed distributed space-time coding (DSTC) transmission scheme in a two-path successive relay network which enjoys SNR-based selection relaying protocol. A closed-form expression for the end-to-end bit error rate (BER) of the system is derived. Regardless of the fading in inter-relay channel, the proposed scheme ensures that full rate and full diversity can be attained in the presence of decoding errors at the relay nodes. Simulation results, show a significant power saving about 2.5 dB at BER (10(-4)) in comparison to other conventional methods.

关键词： Adaptive threshold cooperative beamforming diversity space-time coding successive relaying.

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