Search | Engineering

订阅投稿

首页工程期刊工程焦点工程成就工程前沿关于我们 English

资源类型

期刊论文 16

年份

2022 2

2021 1

2019 1

2018 2

2017 3

2011 1

2009 1

2008 2

2007 1

2006 1

2005 1

展开︾

关键词

DSM（设计结构矩阵） 1

上下行解耦；用户接入；资源划分；异构蜂窝网络；联合博弈 1

主动回收 1

产流 1

冠层截留 1

分析 1

可达集 1

土壤水 1

地下水 1

多目标优化 1

大数据；大数据存储；NoSQL数据库；分布式数据库；CAP定理；可扩展性；一致性-分区弹性；可用性-分区弹性 1

字符串相似性连接；编辑距离；过滤再细化；数据划分；组合频率向量 1

循环 1

抗衰粒度 1

指标体系 1

改进的免疫算法 1

模块化划分 1

步态识别；分块算法；步态模板；步态分析；步态能量图；深度卷积神经网络；生物特征识别；模式识别 1

水文尺度 1

展开︾

检索范围：

排序：展示方式：

Minimization of total energy consumption in an m-machine flow shop with an exponential time-dependent learning effect

Lingxuan LIU, Zhongshun SHI, Leyuan SHI

《工程管理前沿（英文）》 2018年第5卷第4期页码 487-498 doi: 10.15302/J-FEM-2018042

摘要：

This study investigates an energy-aware flow shop scheduling problem with a time-dependent learning effect. The relationship between the traditional and the proposed scheduling problem is shown and objective is to determine a job sequence in which the total energy consumption is minimized. To provide an efficient solution framework, composite lower bounds are proposed to be used in a solution approach with the name of Bounds-based Nested Partition (BBNP). A worst-case analysis on shortest process time heuristic is conducted for theoretical measurement. Computational experiments are performed on randomly generated test instances to evaluate the proposed algorithms. Results show that BBNP has better performance than conventional heuristics and provides considerable computational advantage.

关键词： flow shop energy-aware scheduling learning effect nested partition worst-case error bound

HTML PDF 收藏

Controlling nested wrinkle morphology through the boundary effect on narrow-band thin films

Hanyang XU, Tielin SHI, Guanglan LIAO, Qi XIA

《机械工程前沿（英文）》 2019年第14卷第2期页码 235-240 doi: 10.1007/s11465-017-0458-6

摘要： We describe the formation of nested wrinkles created by the thermal mismatch between a narrow-band thin film and a compliant substrate. When a film is described as “narrow-band”, it literally means that the film band width is much shorter than its length; more precisely, it means that the width is comparable with the wavelength of the wrinkles. A silicon mask was used during film sputtering to create narrow-band films on poly (dimethylsiloxane) substrate, thus creating regular boundaries to steer local stresses and control wrinkle morphology. Disordered nano-scale wrinkles were found nested within highly ordered micro-scale sinusoidal wrinkles. The formation of nested wrinkles was explained through the amplitude and wavelength saturation of nano-scale wrinkles. The disordered morphology of nano-scale wrinkles and the highly ordered morphology of micro-scale wrinkles were explained by using the boundary effect.

关键词： nested and hierarchical wrinkles morphology amplitude saturation boundary effect

HTML PDF 收藏

Dynamic visco-plastic memorial nested yield surface model of soil

ZHUANG Haiyang, CHEN Guoxing, ZHU Dinghua

《结构与土木工程前沿（英文）》 2008年第2卷第1期页码 49-55 doi: 10.1007/s11709-008-0003-0

摘要： Under cyclic loadings, the plastic strain of soft soil will take place under very small shear strain. So the visco-plastic model is appropriate to be used to model the dynamic characteristics of soft soil. Based on the principles of geotechnical plastic mechanics, the incremental visco-plastic memorial nested yield surface model is developed by using the field theory of nonlinear isotropic materials and the theory of kinematical hardening modulus. At the end of anyone time increment, the inverted loading surface, the damaged surface and the initial loading surface which is tangent with the inside of inverted loading surface are memorized respectively. The kinematical behavior of yield surface is defined by using these three surfaces. The developed model in this paper is successfully implemented in ABAQUS using FORTRAN subroutine. The predicted stress-strain relationships of soft soil are compared with the test results given by dynamic triaxial tests. It is proved that the cyclic undrained stress-strain relation of soils can be fairly simulated by the model. At last, the nonlinear earthquake response of a representative soft site in Nanjing city is calculated with the dynamic behavior of soils modeled by the new developed model. The results are accordant to the earthquake response of soft site given by other scholars.

关键词： developed dynamic surface inverted appropriate

HTML PDF 收藏

Pyrene partition behavior to the NOM: Effect of NOM characteristics and its modification by ozone preoxidation

Jin GUO, Jun MA

《环境科学与工程前沿（英文）》 2009年第3卷第1期页码 56-61 doi: 10.1007/s11783-009-0003-x

摘要： Hydrophobic organic contaminants (HOCs)—pyrene, and natural organic matters (NOM) from different sources were taken as the test compounds to investigate the impact of physicochemical characteristics of NOM on HOCs’ partition to the NOM in this study. The effects of solution property, NOM characteristics, and modification by ozone preoxidation on pyrene partition to NOM were systematically evaluated. According to the fluorescence quenching method, the partition coefficient of pyrene to NOM was calculated, which was found to have a great relationship with the aromatic structures and hydrophobic functional groups of the NOM. The NOM characteristic modification corresponding to solution property could influence the interactions between the NOM and pyrene. Preozonation could destroy the aromatic or hydrophobic structures of the NOM and decrease of pyrene.

关键词： natural organic matters (NOM) pyrene partition coefficient ozone

HTML PDF 收藏

Joint user association and resource partition for downlink-uplink decoupling in multi-tier HetNets Article

Zhi-yong FENG, Ze-bing FENG, T. Aaron GULLIVER

《信息与电子工程前沿（英文）》 2017年第18卷第6期页码 817-829 doi: 10.1631/FITEE.1700031

摘要：传统蜂窝网络要求移动用户上行和下行连接在相同基站上。然而，由于用户与基站发射功率存在差异，在不同无线环境下，将会导致用户从某基站接收到最强下行信号，但该基站并不能提供最强接收信号的上行链路。而且，由于大量机器设备接入蜂窝网络中，网络上行流量需求增大，从而导致基站下行和上行流量存在严重不对称。在多层异构蜂窝网络环境下，提出了基于上下行解耦的联合用户接入与资源划分模型。区别于现有用户接入异构蜂窝网络的准则，如基于最大用户接收功率和小区范围扩展，提出了基于联合博弈的机制以实现上下行解耦条件下的用户最优接入。对该机制的稳定性和收敛性作了证明，且证明其收敛到纳什均衡点的速率呈几何级数增长。此外，基于上述用户上下行接入的结果，得到了考虑用户公平性条件下的基站下行和上行最优带宽划分。仿真结果显示：相比现有其他用户接入策略，提出的机制有效地提升了网络速率。

关键词：上下行解耦；用户接入；资源划分；异构蜂窝网络；联合博弈

HTML PDF 收藏

Adsorption and partition of benzo(a)pyrene on sediments with different particle sizes from the Yellow

XIA Xinghui, HU Lijuan, MENG Lihong

《环境科学与工程前沿（英文）》 2007年第1卷第2期页码 172-178 doi: 10.1007/s11783-007-0030-4

摘要： Experiments have been carried out to study the sorption of Benzo(a)pyrene(Bap) on sediment particles from the Yellow River using a batch equilibration technique. Effects of particle size on the adsorption and partition of Bap were investigated with the particle content of 3 g/L. Several significant results were obtained from the study. (1) Isotherms of Bap could be fitted with the dual adsorption-partition model under different particle sizes, and the measured value of the adsorption and partition was in agreement with the theoretical value of the dual adsorption-partition model. (2) When the particle diameter was "e 0.025 mm, the adsorption was predominant in the sorption of Bap, which accounted for 68.7% 82.4% of the sorption. For the particles with the size of 0.007 mm "e < 0.025 mm, the adsorption was predominant when the equilibrium concentration of Bap was 0 8.87 μg/L in the water phase; and the partition was predominant when the equilibrium concentration of Bap was higher than 8.87 μg/L in the water phase. When the particle diameter was <0.007 mm, the partition was predominant. (3) On the point of particle size, the contribution of adsorption to sorption followed the order: "e0.025 mm > 0.007 mm "d<0.025 mm > <0.007 mm . (4) The partition coefficients of Bap in solids with different particle sizes were linearly correlated with the organic content, and the K of Bap was about 1.26 x 10 (L/kg).

HTML PDF 收藏

频率连接：基于数据划分的一种高效字符串相似性连接算法 Article

Ji-zhou LUO, Sheng-fei SHI, Hong-zhi WANG, Jian-zhong LI

《信息与电子工程前沿（英文）》 2017年第18卷第10期页码 1499-1510 doi: 10.1631/FITEE.1601347

摘要：字符串相似性连接（string similarity join, SSJ）在很多应用中，特别是在需要找出重复对象的应用中发挥着关键作用。本文关注基于编辑距离的字符串相似性连接。现有算法大多采用先过滤再细化的框架，使得它们很难发现和利用字符串子集间的不相似性，也很难利用如字符频率这样的统计信息。本研究提出了一种基于数据划分的字符串相似性连接算法，它充分利用了这种统计信息。采用频率向量将字符串集划分成一系列较小的子集，使得子集之间的不相似性很容易被发现。本文提出的新算法利用划分后的数据高效地对字符串进行相似性。此外，本文还给出了一个新的过滤器，它能利用字符频率来过滤很多能够通过现有过滤器的不相似字符串。真实数据集上的试验表明，本文提出的算法性能较现有算法有较大幅度的提升。

关键词：字符串相似性连接；编辑距离；过滤再细化；数据划分；组合频率向量

HTML PDF 收藏

大数据存储技术综述 Review

Aisha SIDDIQA, Ahmad KARIM, Abdullah GANI

《信息与电子工程前沿（英文）》 2017年第18卷第8期页码 1040-1070 doi: 10.1631/FITEE.1500441

摘要：对于容量快速增长、日趋多元化的大数据，业界亟需开发可行性更好的存储工具。为满足大数据存储需求，存储机制已经形成从传统数据管理系统到NoSQL技术的结构化转移。然而，目前可用的大数据存储技术无法为持续增长的异构数据提供一致、可扩展和可用的解决方案。在科学实验、医疗保健、社交网络和电子商务等实际应用中，存储是大数据分析的第一步。截至目前，亚马逊、谷歌和阿帕奇等公司形成了大数据存储方案的行业标准，但尚未有关于大数据存储技术性能和容量提升的深入调查和文献报告。本文旨在对目前可用于大数据的最先进的存储技术进行全面调查，提供了一个明确的大数据存储技术分类方法，以帮助数据分析师和研究人员了解和选择更适合其需求的存储机制。我们使用布鲁尔的CAP定理比较和分析了现有存储方法，评估了不同存储架构的性能，讨论了存储技术的意义、应用及其对其他类别数据的支持。为了加快部署可靠和可扩展的存储系统，文中还突出了未来研究面临的几个挑战。

关键词：大数据；大数据存储；NoSQL数据库；分布式数据库；CAP定理；可扩展性；一致性-分区弹性；可用性-分区弹性

HTML PDF 收藏

Organophosphate esters in sediment from Taihu Lake, China: Bridging the gap between riverine sources and lake sinks

《环境科学与工程前沿（英文）》 2022年第16卷第3期 doi: 10.1007/s11783-021-1464-9

摘要：

• Eleven OPEs were detected in river sediment and lake sediment in Taihu Lake.

关键词： Organophosphate esters Partition Vertical distribution Composition profile Positive matrix factorization

HTML PDF 收藏

Source apportionment of ambient PM

Bo HAN, Xiaohui BI, Yonghua XUE, Jianhui WU, Tan ZHU, Baogui ZHANG, Jianqing DING, Yuanxin DU

《环境科学与工程前沿（英文）》 2011年第5卷第4期页码 552-563 doi: 10.1007/s11783-010-0263-5

摘要： A total of 168 PM samples were collected during the year of 2005 at eight sites in the city of Wuxi in China. Fifteen chemical elements, three water-soluble ions, total carbon and organic carbon were analyzed. Six source categories were identified and their contributions to ambient PM in Wuxi were estimated using a nested chemical mass balance method that reduces the effects of colinearity on the chemical mass balance model. In addition, the concentrations of secondary aerosols, such as secondary organic carbon, sulfate and nitrate, were quantified. The spatially averaged PM was high in the spring and winter (123 μg·m and low in the summer–fall (90 μg·m ). According to the result of source apportionment, resuspended dust was the largest contributor to ambient PM , accounting for more than 50% of the PM mass. Coal combustion (14.6%) and vehicle exhaust (9.4%) were also significant source categories of ambient PM . Construction and cement dust, sulfates, secondary organic carbon, and nitrates made contributions ranging between 4.1% and 4.9%. Other source categories such as steel manufacturing dust and soil dust made low contributions to ambient PM .

关键词： source apportionment inhalable particulate matter nested chemical mass balance method

HTML PDF 收藏

设计结构矩阵在复杂产品协同设计过程的应用

徐路宁,张和明,张永康

《中国工程科学》 2005年第7卷第6期页码 41-44

摘要：

将矩阵方法应用到复杂产品的开发过程中，用DSM（设计结构矩阵）量化表达复杂产品的设计流程，并通过DSM的分析与重构进行复杂产品的协同设计规划，以缩短产品设计周期，降低开发成本。

关键词： DSM（设计结构矩阵）分析重构规划

HTML PDF 收藏

高层建筑火灾风险评估的指标体系设计

刘爱华,施式亮,吴超

《中国工程科学》 2006年第8卷第9期页码 90-94

摘要：

针对高层建筑火灾危险的特点，通过对火灾场景的设定，从消防对策的角度对火灾进行了阶段划分，并针对每个阶段运用了事故树和事件树的方法进行了事故分析，找出了影响火灾发展和蔓延的相关因素，建立了多层次的高层建筑火灾危险评价的指标体系。该指标体系能为建筑物安全管理提供科学依据，也能为高层建筑火灾风险评估奠定基础。

关键词：高层建筑火灾指标体系火灾场景火灾阶段划分

HTML PDF 收藏

面向主动回收的产品模块化设计方法

张宠元,魏巍,詹洋,李汝鹏

《中国工程科学》 2018年第20卷第2期页码 42-49 doi: 10.15302/J-SSCAE-2018.02.007

摘要：

随着人们环保意识的增强，对产品可回收性能的要求也逐渐提高。本文在传统模块化设计方法的基础上，在产品设计初期融入了可主动回收产品的模块化设计思想，提出了基于主动回收产品的模块化准则，并且把主动回收度、内部聚合度以及外部耦合度作为优化目标进行模块划分。在算法部分，提出一种改进的免疫克隆多目标优化算法，该算法以变异操作为主，并通过去除较拥挤的抗体进行优化。最后，把该方法应用于内燃机模块划分中，与未优化的免疫算法进行对比，证明了改进免疫算法的优越性。

关键词：主动回收多目标优化模块化划分改进的免疫算法绿色设计

HTML PDF 收藏

面向对象系统自适应多级嵌套抗衰技术及模型

王湛,赵颜利,刘凤玉,张宏

《中国工程科学》 2008年第10卷第7期页码 158-164

摘要：

对面向对象计算系统执行自适应的细粒度软件抗衰策略，可以进一步增强软件抗衰技术的适用性及灵活性，同时能更大程度地降低抗衰成本，提高软件的可靠性。针对面向对象软件系统中各级组件的性质和特点，制定了将抗衰粒度细化到活动级的重启策略；同时根据各级组件间控制、调用及数据访问的关系，分析了组件间的耦合度，给出了计算组件重启相关性和相关度的方法，判定了组件可达集，确定了各级组件重启群，最终制定出自适应的多级嵌套的软件抗衰策略，并在此基础上构建了策略实施模型，为实现智能化面向对象软件系统的细粒度软件抗衰提供了支持。

关键词：软件抗衰重启相关性可达集抗衰粒度随机高级Petri 网

HTML PDF 收藏

新安江多尺度嵌套水文循环实验流域——科学目标和总体设计 Article

张珂, 李运平, 余钟波, 杨涛, 徐俊增, 晁丽君, 倪晋, 王流通, 高云, 胡余忠, 林祚顶

《工程（英文）》 2022年第18卷第11期页码 207-217 doi: 10.1016/j.eng.2021.08.026

摘要：

本文介绍了于2017 年在中国东部建立的新安江多尺度嵌套水文循环实验流域（XAJ-NEW）的研究背景、科学目标、实验设计和初步成果。该实验流域地处亚热带湿润季风气候区域，流域总面积为2674 km²。XAJ-NEW旨在在典型湿润山丘区构建一个多尺度嵌套水文气象综合观测实验系统，强化对水循环的精
细监测，探索水文过程时空尺度效应，揭示径流产生和分配机制。经过两年的观测运行，初步结果表明，包括降水、径流、地下水、土壤水在内的关键水文气象过程和要素的时空变率与尺度密切相关，并对冠层截留和地表地下径流组分的分配过程进行定量观测。对XAJ-NEW的持续监测可以进一步揭示产流和径流分配机制，揭示水文过程的时空尺度效应，理解气候变化对水文过程的影响。以上成果可以为理解多尺度水文过程及该过程对气候要素的响应、完善模型参数化方案、增强气候预测提供新的见解。

关键词：循环产流水文过程水文尺度土壤水地下水冠层截留