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 2406

会议视频 51

年份

2024 3

2023 186

2022 227

2021 203

2020 196

2019 163

2018 133

2017 137

2016 108

2015 127

2014 92

2013 78

2012 71

2011 72

2010 87

2009 85

2008 85

2007 96

2006 68

2005 53

展开︾

关键词

数学模型 13

遗传算法 12

数值模拟 10

神经网络 10

优化 9

模型试验 9

可持续发展 8

模型 7

能源 7

COVID-19 6

信息技术 5

医学 5

多目标优化 5

机器学习 5

人工智能 4

工程管理 4

智能制造 4

物联网 4

环境 4

展开︾

检索范围：

排序：展示方式：

Generating native user interfaces formultiple devices by means ofmodel transformation

Ignacio MARIN,Francisco ORTIN,German PEDROSA,Javier RODRIGUEZ

《信息与电子工程前沿（英文）》 2015年第16卷第12期页码 995-1017 doi: 10.1631/FITEE.1500083

摘要： In the last years, the types of devices used to access information systems have notably increased using different operating systems, screen sizes, interaction mechanisms, and software features. This device fragmentation is an important issue to tackle when developing native mobile service front-end applications. To address this issue, we propose the generation of native user interfaces (UIs) by means of model transformations, following the modelbased user interface (MBUI) paradigm. The resulting MBUI framework, called LIZARD, generates applications for multiple target platforms. LIZARD allows the definition of applications at a high level of abstraction, and applies model transformations to generate the target native UI considering the specific features of target platforms. The generated applications follow the UI design guidelines and the architectural and design patterns specified by the corresponding operating system manufacturer. The objective is not to generate generic applications following the lowest-common-denominator approach, but to follow the particular guidelines specified for each target device. We present an example application modeled in LIZARD, generating different UIs for Windows Phone and two types of Android devices (smartphones and tablets).

关键词： Model-to-model transformation Native user interfaces Model-based user interfaces Model-driven engineering

HTML PDF 收藏

Cohesive zone model-based analyses of localized leakage of segmentally lined tunnels

《结构与土木工程前沿（英文）》 2023年第17卷第4期页码 503-521 doi: 10.1007/s11709-023-0927-4

摘要： This paper presents a novel approach for simulating the localized leakage behavior of segmentally lined tunnels based on a cohesive zone model. The proposed approach not only simulates localized leakage at the lining segment, but also captures the hydromechanically coupled seepage behavior at the segmental joints. It is first verified via a tunnel drainage experiment, which reveals its merits over the existing local hydraulic conductivity method. Subsequently, a parametric study is conducted to investigate the effects of the aperture size, stratum permeability, and spatial distribution of drainage holes on the leakage behavior, stratum seepage field, and leakage-induced mechanical response of the tunnel lining. The proposed approach yields more accurate results than the classical local hydraulic conductivity method. Moreover, it is both computationally efficient and stable. Localized leakage leads to reduced local ground pressure, which further induces outward deformation near the leakage point and slight inward deformation at its diametrically opposite side. A localized stress arch spanning across the leakage point is observed, which manifests as the rotation of the principal stresses in the adjacent area. The seepage field depends on both the number and location of the leakage zones. Pseudostatic seepage zones, in which the seepage rate is significantly lower than that of the adjacent area, appear when multiple seepage zones are considered. Finally, the importance of employing the hydromechanical coupled mechanism at the segment joints is highlighted by cases of shallowly buried tunnels subjected to surface loading and pressure tunnels while considering internal water pressure.

关键词： segmentally lined tunnel localized leakage cohesive element hydraulic behavior numerical modeling

HTML PDF 收藏

Current status and prospects of reliability systems engineering in China

《工程管理前沿（英文）》 2021年第8卷第4期页码 492-502 doi: 10.1007/s42524-021-0172-2

摘要： This study provides a systematic overview of the advent and evolution of reliability systems engineering (RSE) in China, and the latest RSE development, that is, model-based RSE (MBRSE), is emphatically introduced. The establishment of the system architecture and conceptual models of MBRSE is first described. The fundamental theory and methodology of MBRSE are then elaborated, with a V-model as the core of this approach. The development of various MBRSE platforms and the effectiveness of their implementation over the past 30 years are presented. The prospective trends in the development of RSE in China are outlined.

关键词： reliability effectiveness model-based systems engineering reliability systems engineering

HTML PDF 收藏

Image-based fall detection and classification of a user with a walking support system

Sajjad TAGHVAEI, Kazuhiro KOSUGE

《机械工程前沿（英文）》 2018年第13卷第3期页码 427-441 doi: 10.1007/s11465-017-0465-7

摘要：

The classification of visual human action is important in the development of systems that interact with humans. This study investigates an image-based classification of the human state while using a walking support system to improve the safety and dependability of these systems. We categorize the possible human behavior while utilizing a walker robot into eight states (i.e., sitting, standing, walking, and five falling types), and propose two different methods, namely, normal distribution and hidden Markov models (HMMs), to detect and recognize these states. The visual feature for the state classification is the centroid position of the upper body, which is extracted from the user’s depth images. The first method shows that the centroid position follows a normal distribution while walking, which can be adopted to detect any non-walking state. The second method implements HMMs to detect and recognize these states. We then measure and compare the performance of both methods. The classification results are employed to control the motion of a passive-type walker (called “RT Walker”) by activating its brakes in non-walking states. Thus, the system can be used for sit/stand support and fall prevention. The experiments are performed with four subjects, including an experienced physiotherapist. Results show that the algorithm can be adapted to the new user’s motion pattern within 40 s, with a fall detection rate of 96.25% and state classification rate of 81.0%. The proposed method can be implemented to other abnormality detection/classification applications that employ depth image-sensing devices.

关键词： fall detection walking support hidden Markov model multivariate analysis

HTML PDF 收藏

Model-based nonlinear control of hydraulic servo systems: Challenges, developments and perspectives

Jianyong YAO

《机械工程前沿（英文）》 2018年第13卷第2期页码 179-210 doi: 10.1007/s11465-018-0464-3

摘要：

Hydraulic servo system plays a significant role in industries, and usually acts as a core point in control and power transmission. Although linear theory-based control methods have been well established, advanced controller design methods for hydraulic servo system to achieve high performance is still an unending pursuit along with the development of modern industry. Essential nonlinearity is a unique feature and makes model-based nonlinear control more attractive, due to benefit from prior knowledge of the servo valve controlled hydraulic system. In this paper, a discussion for challenges in model-based nonlinear control, latest developments and brief perspectives of hydraulic servo systems are presented: Modelling uncertainty in hydraulic system is a major challenge, which includes parametric uncertainty and time-varying disturbance; some specific requirements also arise ad hoc difficulties such as nonlinear friction during low velocity tracking, severe disturbance, periodic disturbance, etc.; to handle various challenges, nonlinear solutions including parameter adaptation, nonlinear robust control, state and disturbance observation, backstepping design and so on, are proposed and integrated, theoretical analysis and lots of applications reveal their powerful capability to solve pertinent problems; and at the end, some perspectives and associated research topics (measurement noise, constraints, inner valve dynamics, input nonlinearity, etc.) in nonlinear hydraulic servo control are briefly explored and discussed.

关键词： hydraulic servo system adaptive control robust control nonlinear friction disturbance compensation repetitive control noise alleviation constraint control

HTML PDF 收藏

流程工业智能制造展望：过程系统工程师面临的挑战

Lockhart Bogle Ian David

《工程（英文）》 2017年第3卷第2期页码 161-165 doi: 10.1016/J.ENG.2017.02.003

摘要：

本文讨论了流程工业智能制造对过程系统工程(PSE) 研究人员提出的挑战。现有的研究在实现全厂和全站点优化方面已经取得了很大进展，进行基准化测试能够增加说服力。本文进一步讨论了过程系统工程师在开发可用工具和技术时遇到的技术性挑战，包括灵活性和不确定性，响应性和敏捷性，鲁棒性和安全性，混合物性质和功能的预测，以及新的建模和数学范式。利用大数据进行智能化开发来驱动系统灵活性需要面对新的挑战，例如，如何在漫长又复杂的供应链中确保数据的一致性和机密性。建模方面也存在很多挑战，涉及如何对所有的关键技术进行恰当的建模，特别是健康、安全和环境方面，需要在特定地点对微小却关键的量进行准确预测。对环境方面的关注要求我们紧密跟踪所有的分子种类，以便于它们能被最佳地用于创造可持续的解决方案。而源自于新型个性化产品的破坏性商业模式对环境的影响则难以预测。

关键词：智能制造过程系统工程不确定性灵活性优化基于模型的控制

HTML PDF 收藏

云存储中基于属性加密的通用型用户撤销系统 None

Genlang CHEN, Zhiqian XU, Hai JIANG, Kuan-ching LI

《信息与电子工程前沿（英文）》 2018年第19卷第11期页码 1362-1384 doi: 10.1631/FITEE.1800405

摘要：基于属性加密（attribute-based encryption，ABE）不仅保护数据的机密性，而且其中的密文或解密密钥与相关细粒度访问策略有关，这些策略在解密过程中被自动执行，使每个数据级别的数据访问处于控制之下提出两种具有隐私保护功能的基于属性加密的通用型用户撤销系统：通过密文重加密（user revocation via ciphertext re-encryption，UR-CRE）实现的用户撤销系统和通过云存储提供商（user revocation via cloud storage providers，UR-CSP）实现的用户撤销系统。

关键词：基于属性的加密；通用型用户撤销；用户隐私；云存储；访问控制

HTML PDF 收藏

聚焦两相界面

沈平

《工程（英文）》 2021年第7卷第5期页码 552-553 doi: 10.1016/j.eng.2021.02.003

HTML PDF 收藏

Zhen-hua YUAN, Chen CHEN, Xiang CHENG, Guo-cheng LV, Liu-qing YANG, Ye JIN

《信息与电子工程前沿（英文）》 2017年第18卷第6期页码 796-807 doi: 10.1631/FITEE.1700023

摘要：主要研究在相关信道模型条件下两跳无线通信网络的中继物理层安全波束成形方案设计问题。系统模型由1个发送节点、1个合法接收节点、1个窃听节点和1个采用放大转发策略的中继节点构成，其中中继节点装备多天线，而其他节点都装备单天线，窃听节点靠近合法接收节点进行窃听，从而使得二者与中继节点之间的信道具有相关性。中继节点无法获得窃听信道的瞬时信道状态信息，只可获得合法信道的瞬时状态信息，以及合法信道与窃听信道之间的相关性信息，据此中继节点可推导出窃听信道状态的条件概率分布。以系统近似遍历安全容量为优化目标，研究了2种中继波束成形方案：1最大化合法信道容量的“广义匹配转发方案”；2“普通阶波束成形方案”。另外，还讨论了基于遍历安全容量下界的“下界最优化波束成形方案”。与上述两方案比对，“广义匹配转发方案”是最优的秩-1方案，“普通阶波束成形方案”则是基于近似遍历安全容量的迭代最优的中继转发方案。通过仿真对各波束成形方案的性能进行比较，验证了本文的分析。从仿真结果还可以看出：当中继节点发送功率较低，或者第二跳信道增益较低时，“广义匹配转发方案”的性能优于“普通阶波束成形方案”。

关键词：物理层安全；中继波束成形；相关信道；遍历安全速率；凸优化

HTML PDF 收藏

不确定条件下采用精确参数规划的非线性模型过程操作

Vassilis M. Charitopoulos,Lazaros G. Papageorgiou,Vivek Dua

《工程（英文）》 2017年第3卷第2期页码 202-213 doi: 10.1016/J.ENG.2017.02.008

摘要：

本文提出了新的两(多) 参数规划(mp-P) 启发算法以求解混合整数非线性规划(MINLP) 问题，并着重说明了算法在过程综合问题中的应用。对于因对数项导致的非线性，开发了针对确定性问题的参数算法(p-MINLP)。关键之处是通过将二进制变量和(或) 不确定参数作为符号参数重新生成和求解一阶Karush Kuhn Tucker(KKT) 系统的解析表达式。为此，采用了符号处理和求解技术。为了证明所提出的算法的适用性和有效性，对两个过程综合案例研究进行了验证，相应的结果经最新的数值MINLP 求解器验证是有效的。对于p-MINLP，给出了不确定参数的显函数表示的最优解。

关键词：参数规划不确定性过程综合混合整数非线性规划符号操作

HTML PDF 收藏

Conceptual study on incorporating user information into forecasting systems

Jiarui HAN, Qian YE, Zhongwei YAN, Meiyan JIAO, Jiangjiang XIA

《环境科学与工程前沿（英文）》 2011年第5卷第4期页码 533-542 doi: 10.1007/s11783-010-0246-6

摘要： The purpose of improving weather forecast is to enhance the accuracy in weather prediction. An ideal forecasting system would incorporate user-end information. In recent years, the meteorological community has begun to realize that while general improvements to the physical characteristics of weather forecasting systems are becoming asymptotically limited, the improvement from the user end still has potential. The weather forecasting system should include user interaction because user needs may change with different weather. A study was conducted on the conceptual forecasting system that included a dynamic, user-oriented interactive component. This research took advantage of the recently implemented TIGGE (THORPEX interactive grand global ensemble) project in China, a case study that was conducted to test the new forecasting system with reservoir managers in Linyi City, Shandong Province, a region rich in rivers and reservoirs in eastern China. A self-improving forecast system was developed involving user feedback throughout a flood season, changing thresholds for flood-inducing rainfall that were responsive to previous weather and hydrological conditions, and dynamic user-oriented assessments of the skill and uncertainty inherent in weather prediction. This paper discusses ideas for developing interactive, user-oriented forecast systems.

关键词： user-end information user-oriented interactive forecasting system TIGGE (THORPEX interactive grand global ensemble)

HTML PDF 收藏

A lightweight authentication scheme with user untraceability

Kuo-Hui YEH

《信息与电子工程前沿（英文）》 2015年第16卷第4期页码 259-271 doi: 10.1631/FITEE.1400232

摘要： With the rapid growth of electronic commerce and associated demands on variants of Internet based applications, application systems providing network resources and business services are in high demand around the world. To guarantee robust security and computational efficiency for service retrieval, a variety of authentication schemes have been proposed. However, most of these schemes have been found to be lacking when subject to a formal security analysis. Recently, Chang (2014) introduced a formally provable secure authentication protocol with the property of user-untraceability. Unfortunately, based on our analysis, the proposed scheme fails to provide the property of user-untraceability as claimed, and is insecure against user impersonation attack, server counterfeit attack, and man-in-the-middle attack. In this paper, we demonstrate the details of these malicious attacks. A security enhanced authentication scheme is proposed to eliminate all identified weaknesses.

关键词： Authentication Privacy Security Smart card Untraceability

HTML PDF 收藏

基于简化LSCMA算法的STBC MC－CDMA系统盲多用户检测

熊亦兰,酆广增

《中国工程科学》 2007年第9卷第5期页码 42-45

摘要：

在空时分组编码（STBC）的MC－CDMA系统中，根据STBC正交编码的特点，提出了一种简单可行的基于常模（CM）准则的盲多用户检测算法。该算法基于最小二乘常模算法（LSCMA）的盲多用户检测算法，算法大为简化，抽头系数减少了一半，性能略有下降。

关键词：盲多用户检测简化LSCMA算法空时编码MC-CDMA

HTML PDF 收藏

考虑用户偏好的服务组合防策略拍卖机制

夏瑶,黄志球

《信息与电子工程前沿（英文）》 2021年第22卷第2期页码 141-286 doi: 10.1631/FITEE.1900726

摘要：服务组合是一种基于服务成本和服务质量（QoS）将现有原子服务组合为增值服务的有效方法。为满足用户的多样化需求，提供基于QoS的定价服务，提出一种基于用户偏好的服务组合拍卖机制，该机制具有防策略性，有利于根据用户偏好选择服务，动态确定服务价格。本文证明，所提出的拍卖机制达到了期望的性质，包括真实性和个体合理性。此外，提出一种拍卖算法来实现拍卖机制，并在真实数据基础上进行大量实验。结果表明，所提出的拍卖机制不仅达到预期效果，而且帮助用户找到满意的服务组合方案。

关键词：组合逆向拍卖；服务组合；用户偏好；防策略性；动态定价

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

标题作者时间类型操作

Generating native user interfaces formultiple devices by means ofmodel transformation

Ignacio MARIN,Francisco ORTIN,German PEDROSA,Javier RODRIGUEZ

期刊论文

Cohesive zone model-based analyses of localized leakage of segmentally lined tunnels

期刊论文

Current status and prospects of reliability systems engineering in China

期刊论文

Image-based fall detection and classification of a user with a walking support system

Sajjad TAGHVAEI, Kazuhiro KOSUGE