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A rectangle bin packing optimization approach to the signal scheduling problem in the FlexRay static

Rui ZHAO,Gui-he QIN,Jia-qiao LIU

Frontiers of Information Technology & Electronic Engineering 2016, Volume 17, Issue 4, Pages 375-388 doi: 10.1631/FITEE.1500232

Abstract: In this study, we propose a rectangle bin packing optimization approach to schedule communication signals

Keywords： FlexRay Real-time applications Rectangle bin packing Schedule optimization Slot multiplexing

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HAPE3D—a new constructive algorithm for the 3D irregular packing problem

Xiao LIU,Jia-min LIU,An-xi CAO,Zhuang-le YAO

Frontiers of Information Technology & Electronic Engineering 2015, Volume 16, Issue 5, Pages 380-390 doi: 10.1631/FITEE.1400421

Abstract: a heuristic algorithm based on the principle of minimum total potential energy for the 3D irregular packingproblem, involving packing a set of irregularly shaped polyhedrons into a box-shaped container withthat HAPE3D does not need to calculate no-fit polyhedron (NFP), which is a huge obstacle for the 3D packingand prove that it can be hybridized quite well with a meta-heuristic algorithm to further improve the packing

Keywords： 3D packing problem Layout design Simulation Optimization Constructive algorithm Meta-heuristics

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Design of packing cup interference fit value of hypercompressors for low density polyethylene production

Da LEI,Xuehong LI,Yun LI,Xiwen REN

Frontiers in Energy 2019, Volume 13, Issue 1, Pages 107-113 doi: 10.1007/s11708-017-0450-1

Abstract: A packing cup is the basic unit of cylinder packing, assembled by the interference fit between an innerBecause the shrink-fitting prestresses the packing cup, serious design is needed to gain a favorableThe traditional method of designing the interference fit value for packing cups depends on the shrink-fit, the finite element method (FEM) has been implemented to determine a more accurate stress level of packingThe maximum Von Mises equivalent stress in a packing cup increases after a decline with the rise of the

Keywords： interference fit value packing cup hypercompressor finite element method (FEM)

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A Novel Approach to Solve Complex Packing Problems

Wang Tao,Wei Feng

Strategic Study of CAE 2004, Volume 6, Issue 12, Pages 65-68

Abstract:

A novel approach which can solve complex packing problems is proposed.It solves the complex packing problems in two steps： Firstly, the volume-maximizing loading is carriedthe position of the center of gravity is adjusted optimally by genetic algorithm, so as to make the packingThe practical result shows that it is better than other packing approaches in terms of the usage rate

Keywords： packing problems heuristic center of gravity genetic algorithm

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Fundamental frequency and testing mode of complicated elastic clamped-plate vibration

QI Hongyuan, GUAN Yiduo

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 4, Pages 360-364 doi: 10.1007/s11465-008-0084-4

Abstract: Taking an elastic rectangle-plate with arc radius as an example, the testing mode frequency band of plates

Keywords： multi-point excitation rectangle-plate single-point processing technology trigonometric interpolation

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Understanding the behavior of recycled aggregate concrete by using thermogravimetric analysis

Subhasis PRADHAN, Shailendra KUMAR, Sudhirkumar V. BARAI

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 6, Pages 1561-1572 doi: 10.1007/s11709-020-0640-5

Abstract: aggregate and recycled coarse aggregate (RCA)) and mix design methods (conventional method and Particle Packing

Keywords： recycled aggregate concrete Particle Packing Method thermogravimetric analysis chemically bound water

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Optimization of cold end system of steam turbine

ZHAO Bin, LIU Ling, ZHANG Wenbing

Frontiers in Energy 2008, Volume 2, Issue 3, Pages 348-353 doi: 10.1007/s11708-008-0036-z

Abstract: An optimization of the movement characteristic of the cold end system of the steam turbine was conducted from an overall consideration of the condenser and the circulation water pump. An analysis method based on thermodynamics theory

Keywords： circulation characteristic analysis optimization condenser

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The Immense Impact of Reverse Edges on Large Hierarchical Networks

Haosen Cao,Bin-Bin Hu,Xiaoyu Mo,Duxin Chen,Jianxi Gao,Ye Yuan,Guanrong Chen,Tamás Vicsek,Xiaohong Guan

Engineering doi: 10.1016/j.eng.2023.06.011

Abstract: Hierarchical networks are frequently encountered in animal groups, gene networks, and artificial engineering systems such as multiple robots, unmanned vehicle systems, smart grids, wind farm networks, and so forth. The structure of a large directed hierarchical network is often strongly influenced by reverse edges from lower- to higher- level nodes, such as lagging birds’ howl in a flock or the opinions of lower-level individuals feeding back to higher-level ones in a social group. This study reveals that, for most large-scale real hierarchical networks, the majority of the reverse edges do not affect the synchronization process of the entire network; the synchronization process is influenced only by a small part of these reverse edges along specific paths. More surprisingly, a single effective reverse edge can slow down the synchronization of a huge hierarchical network by over 60%. The effect of such edges depends not on the network size but only on the average in-degree of the involved subnetwork. The overwhelming majority of active reverse edges turn out to have some kind of “bunching” effect on the information flows of hierarchical networks, which slows down synchronization processes. This finding refines the current understanding of the role of reverse edges in many natural, social, and engineering hierarchical networks, which might be beneficial for precisely tuning the synchronization rhythms of these networks. Our study also proposes an effective way to attack a hierarchical network by adding a malicious reverse edge to it and provides some guidance for protecting a network by screening out the specific small proportion of vulnerable nodes.

Keywords： Synchronizability Large hierarchical networks Reverse edges Information flows Complex networks

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2019 novel coronavirus outbreak: a quiz or final exam?

Jiuyang Xu, Yijun Chen, Hao Chen, Bin Cao

Frontiers of Medicine 2020, Volume 14, Issue 2, Pages 225-228 doi: 10.1007/s11684-020-0753-1

Abstract: The 2019 novel coronavirus (2019-nCoV) is an emerging pathogen and is threatening the global health. Strikingly, more than 28 000 cases and 550 deaths have been reported within two months from disease emergence. Armed with experience from previous epidemics in the last two decades, clinicians, scientists, officials, and citizens in China are all contributing to the prevention of further 2019-nCoV transmission. Efficient preliminary work has enabled us to understand the basic characteristics of 2019-nCoV, but there are still many unanswered questions. It is too early now to judge our performance in this outbreak. Continuous and strengthened efforts should be made not only during the epidemic, but also afterwards in order to prepare for any incoming challenges.

Keywords： 2019-nCoV novel coronavirus epidemic public response

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Unified description of sand behavior

Feng ZHANG, Bin YE, Guanlin YE

Frontiers of Structural and Civil Engineering 2011, Volume 5, Issue 2, Pages 121-150 doi: 10.1007/s11709-011-0104-z

Abstract: In this paper, the mechanical behavior of sand, was systematically described and modeled with a elastoplastic model proposed by Zhang et al. [ ]. Without losing the generality of the sand, a specific sand called as Toyoura sand, a typical clean sand found in Japan, has been discussed in detail. In the model, the results of conventional triaxial tests of the sand under different loading and drainage conditions were simulated with a fixed set of material parameters. The model only employs eight parameters among which five parameters are the same as those used in Cam-clay model. Once the parameters are determined with the conventional drained triaxial compression tests and undrained triaxial cyclic loading tests, then they are fixed to uniquely describe the overall mechanical behaviors of the Toyoura sand, without changing the values of the eight parameters irrespective of what kind of the loadings or the drainage conditions may be. The capability of the model is discussed in a theoretical way.

Keywords： constitutive model sand stress-induced anisotropy density structure

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Solutions for a completely saturated porous elastic solid with impeded boundaries

CHEN Yunmin, LING Daosheng, ZHU Bin, CHENG Zehai

Frontiers of Structural and Civil Engineering 2007, Volume 1, Issue 3, Pages 322-328 doi: 10.1007/s11709-007-0042-y

Abstract: Analytical solutions are presented for the consolidation of a semi-infinite stratum and a finite soil layer with an impeding layer located on the surface subjected to a vertical point loading. The Laplace transform and the Hankel transform are used with respect to time and the radial coordinate, respectively. Solutions of other distributed loadings, including the circular loading, can be easily obtained by integrating those of the point loading. The consolidation degree, excess pore water pressure, vertical total stress, and the shear stress of the consolidating layer are analyzed in this study. The consolidation rate decreases with the increase in the thickness of the impeding layer. Stresses of the consolidating layer vary during the consolidation due to the coupling of the excess pore water dissipation and the soil skeleton deformation. Further, the Mandel-Cryer effect is also analyzed in this study.

Keywords： coupling vertical pressure excess distributed

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MEMS-based thermoelectric infrared sensors: A review

Dehui XU, Yuelin WANG, Bin XIONG, Tie LI

Frontiers of Mechanical Engineering 2017, Volume 12, Issue 4, Pages 557-566 doi: 10.1007/s11465-017-0441-2

Abstract:

In the past decade, micro-electromechanical systems (MEMS)-based thermoelectric infrared (IR) sensors have received considerable attention because of the advances in micromachining technology. This paper presents a review of MEMS-based thermoelectric IR sensors. The first part describes the physics of the device and discusses the figures of merit. The second part discusses the sensing materials, thermal isolation microstructures, absorber designs, and packaging methods for these sensors and provides examples. Moreover, the status of sensor implementation technology is examined from a historical perspective by presenting findings from the early years to the most recent findings.

Keywords： thermoelectric infrared sensor CMOS-MEMS thermopile micromachining wafer-level package

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Vector quantization: a review Regular Papers

Ze-bin WU, Jun-qing YU

Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 4, Pages 507-524 doi: 10.1631/FITEE.1700833

Abstract:

Vector quantization (VQ) is a very effective way to save bandwidth and storage for speech coding and image coding. Traditional vector quantization methods can be divided into mainly seven types, tree-structured VQ, direct sum VQ, Cartesian product VQ, lattice VQ, classified VQ, feedback VQ, and fuzzy VQ, according to their codebook generation procedures. Over the past decade, quantization-based approximate nearest neighbor (ANN) search has been developing very fast and many methods have emerged for searching images with binary codes in the memory for large-scale datasets. Their most impressive characteristics are the use of multiple codebooks. This leads to the appearance of two kinds of codebook: the linear combination codebook and the joint codebook. This may be a trend for the future. However, these methods are just finding a balance among speed, accuracy, and memory consumption for ANN search, and sometimes one of these three suffers. So, finding a vector quantization method that can strike a balance between speed and accuracy and consume moderately sized memory, is still a problem requiring study.

Keywords： Approximate nearest neighbor search Image coding Vector quantization

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Time reversal method for guided wave inspection in pipes

DENG Fei, WU Bin, HE Cunfu

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 3, Pages 251-260 doi: 10.1007/s11465-008-0050-1

Abstract: The application of the time reversal method in pipe-like structures based on finite element method (FEM) is investigated. A steel pipe model measuring 70 mm × 3.5 mm is used to analyze the reflection coefficient of the (0,2) mode with the time reversal process. Simulation results show that the time reversal array method is beneficial to the improvement of the signal-to-noise ratio of a guided wave inspection system. As the intercepting window is widened, more energy is included in re-emitted signals, which leads to a large reflection coefficient of the (0,2) mode. In parallel, a circumferential locating method based on the time reversal method is described. The time reversal process used for guided wave inspection leads to the temporal and spatial focusing. When the time reversal signals are re-emitted, the angular profile obtained at the axial location of the defect can be used to determine the circumferential location of the defect. Except for a pipe with one defect, the circumferential locating method has been verified on another pipe model with two defects. Meanwhile, the elements number of the time reversal array has been discussed for enhancing the discrimination of the defect circumferential location.

Keywords： reversal process beneficial circumferential location energy number

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Low-cost green building practice in China: Library of Shandong Transportation College

Yingxin ZHU, Borong LIN, Bin YUAN,

Frontiers in Energy 2010, Volume 4, Issue 1, Pages 100-105 doi: 10.1007/s11708-009-0072-3

Abstract: This paper introduces the design idea and technique utilized in the Library of Shandong Transportation College, which ranked 1st in the 2nd National Green Buildings Innovation Award in China in March 2007 due to its low cost and climate-oriented green strategy during its design and construction phase, including land saving, energy efficiency, water conservation, and so on. Originally, the place was a landfill site with an odor pool. After reconstruction, it was changed into the construction site of the library with an area of 7000m and a scenery pond. With the integrated use of passive shading, daylighting, ventilation with atriums, high-insulation materials, underground duct ventilation, and the substitution of cooling tower with the pond water, the HVAC load design indexes are 59 W/m and 21.8 W/m for space cooling and heating, respectively, much lower than the newly issued Chinese energy efficient design code for public buildings. Moreover, a set of measures is utilized for water conversation, material saving, and improvement of indoor environmental quality. After three years of operation, the real effect has been validated by electricity meter and field measurement. The total initial cost for the building with the above mentioned integrated technologies was only RMB 2150 per square meter, which was worth spending in China due to the climatic adaptability and the relative low cost.

Keywords： green building low cost technique energy efficiency integrated strategy