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System dynamics analytical modeling approach for construction project management research: A critical review and future directions

Xiaoxiao XU, Patrick X. W. ZOU

《工程管理前沿（英文）》 2021年第8卷第1期页码 17-31 doi: 10.1007/s42524-019-0091-7

摘要： Building and infrastructure construction projects can be viewed as a complex system consisting of many subsystems. Over the last two decades, considerable researches that use system dynamics (SD) as an analytical and modeling approach exist to address construction project management issues. However, only few critical reviews have been conducted to provide an in-depth understanding of SD application in construction project management. Moreover, many studies have failed to apply SD accurately. Therefore, the present study aims to gain an understanding of the current state of play and future directions in applying SD method in construction project management research, by undertaking a comprehensive review of 105 relevant articles published from 1994 to 2018. These articles are analyzed in terms of annual publication rate, key papers and their contribution, critical issues in SD application, and research topics. A significant increase in the number of publications in the last five years has been observed. When applying SD method to model construction system, the following aspects must be carefully considered: Model boundary, model development, model test, and model simulation. In addition, SD has been applied in a wide range of research topics, including (1) sustainable construction; (2) design error, rework, and change management; (3) risk management; (4) resource management; (5) decision making; (6) hybrid modeling; (7) safety management; (8) PPP project; and (9) organization performance. Based on the review findings, this study discusses three future research directions, namely, integration of SD with other methods, uncertainty analysis, and human factor analysis. This study can help researchers gain an in-depth understanding of the critical issues in the application of SD in construction management and the state-of-the-art of SD research.

关键词： system dynamics construction management problem and recommendation research directions literature review human factor

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非独立同分布推荐系统：推荐范式转换的综述和框架 Artical

Longbing Cao

《工程（英文）》 2016年第2卷第2期页码 212-224 doi: 10.1016/J.ENG.2016.02.013

摘要：

虽然推荐系统在我们的生活、学习、工作和娱乐中扮演着越来越重要的角色，但是很多时候我们收到的推荐都是不相关的、重复的，或者包含不感兴趣的产品和服务。这些差的推荐系统产生的原因来源于一个本征假设：传统的理论和推荐系统认为用户和物品是独立同分布的(IID)。另一个明显的现象是，虽然投入了很多的精力模拟用户或者物品的特殊属性，但用户和物品的总体属性及它们之间的非独立同分布性(non-IID) 被忽略了。本文先讨论了推荐系统的非独立同分布性，紧接着介绍了非独立同分布性原理，目的是从耦合和异构性的角度来深入阐述传统的推荐系统的固有本质。这种非独立同分布推荐系统引起了传统推荐系统范式的转化—— 从独立同分布向非独立同分布进行转化，希望能够形成高效的、相关性高的、个人订制和可操作的推荐系统。这种系统创造了令人兴奋的能够解决包含冷启动、以稀疏数据为基础、跨域、基于群组信息和欺诈攻击等各种复杂情况的新的研究方向和解决方案。

关键词：独立同分布非独立同分布异构性关系耦合耦合学习关系学习独立同分布学习非独立同分布学习推荐系统推荐非独立同分布推荐

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实现隐私保护个性化推荐服务 Review

王聪, 郑宜峰, 蒋精华, 任奎

《工程（英文）》 2018年第4卷第1期页码 21-28 doi: 10.1016/j.eng.2018.02.005

摘要：

推荐系统对于向用户提供个性化服务至关重要。通过个性化的推荐服务，用户可以享受各种有针对性的推荐，如电影、书籍、广告、餐馆等。此外，个性化推荐服务极大地推动了在线业务收入的增长。尽管存在诸多好处，但采用个性化推荐服务通常需要收集用户的个人数据以进行处理和分析，会让用户怀疑个人隐私遭到严重侵犯。因此，在尊重用户隐私的前提下开发实用的隐私保护技术来维护个性化推荐服务提供的数据尤为重要。在本文中，我们提供了与隐私保护的个性化推荐服务相关文献的综合调查。我们介绍了个性化推荐系统的总体架构、其中的隐私问题以及集中于隐私保护个性化推荐服务的现有研究。根据个性化推荐和隐私保护的核心支撑技术，我们对现有研究进行了分类，并对其优缺点进行了深入的讨论和对比，特别是针对隐私和推荐的准确性。与此同时，我们也确定了一些未来的研究方向。

关键词：隐私保护个性化推荐服务针对性推送协同过滤机器学习

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Discussion on Problem-Based Engineering Management System

Qiao Xiang

《工程管理前沿（英文）》 2015年第2卷第3期页码 249-260 doi: 10.15302/J-FEM-2015054

摘要： The paper puts forward the idea of problem-based engineering management, expounds its connotation and guiding ideology and moreover, substantially demonstrates its practical significance in the engineering management system for the maintenance of Chinese military aircraft engines.

关键词： problem engineering management system

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Airline planning and scheduling: Models and solution methodologies

Lei ZHOU, Zhe LIANG, Chun-An CHOU, Wanpracha Art CHAOVALITWONGSE

《工程管理前沿（英文）》 2020年第7卷第1期页码 1-26 doi: 10.1007/s42524-020-0093-5

摘要： The airline industry is a representative industry with high cost and low profitability. Therefore, airlines should carefully plan their schedules to ensure that overall profit is maximized. We review the literature on airline planning and scheduling and focus on mathematical formulations and solution methodologies. Our research framework is anchored on three major problems in the airline scheduling, namely, fleet assignment, aircraft routing, and crew scheduling. General formulation, widely used solution approaches, and important extensions are presented for each problem and integrated problems. We conclude the review by identifying promising areas for further research.

关键词： airline planning fleet assignment problem aircraft routing problem crew pairing problem crew rostering problem crew scheduling problem integrated planning

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Rare tumors: a blue ocean of investigation

《医学前沿（英文）》 2023年第17卷第2期页码 220-230 doi: 10.1007/s11684-023-0984-z

摘要： Advances in novel drugs, therapies, and genetic techniques have revolutionized the diagnosis and treatment of cancers, substantially improving cancer patients’ prognosis. Although rare tumors account for a non-negligible number, the practice of precision medicine and development of novel therapies are largely hampered by many obstacles. Their low incidence and drastic regional disparities result in the difficulty of informative evidence-based diagnosis and subtyping. Sample exhaustion due to difficulty in diagnosis also leads to a lack of recommended therapeutic strategies in clinical guidelines, insufficient biomarkers for prognosis/efficacy, and inability to identify potential novel therapies in clinical trials. Herein, by reviewing the epidemiological data of Chinese solid tumors and publications defining rare tumors in other areas, we proposed a definition of rare tumor in China, including 515 tumor types with incidences of less than 2.5/100 000 per year. We also summarized the current diagnosis process, treatment recommendations, and global developmental progress of targeted drugs and immunotherapy agents on the status quo. Lastly, we pinpointed the current recommendation chance for patients with rare tumors to be involved in a clinical trial by NCCN. With this informative report, we aimed to raise awareness on the importance of rare tumor investigations and guarantee a bright future for rare tumor patients.

关键词： rare tumors diagnosis flowchart treatment strategy clinical trials recommendation

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A microblog recommendation algorithm based on social tagging and a temporal interest evolution model

Zhen-ming YUAN,Chi HUANG,Xiao-yan SUN,Xing-xing LI,Dong-rong XU

《信息与电子工程前沿（英文）》 2015年第16卷第7期页码 532-540 doi: 10.1631/FITEE.1400368

摘要： Personalized microblog recommendations face challenges of user cold-start problems and the interest evolution of topics. In this paper, we propose a collaborative filtering recommendation algorithm based on a temporal interest evolution model and social tag prediction. Three matrices are first prepared to model the relationship between users, tags, and microblogs. Then the scores of the tags for each microblog are optimized according to the interest evolution model of tags. In addition, to address the user cold-start problem, a social tag prediction algorithm based on community discovery and maximum tag voting is designed to extract candidate tags for users. Finally, the joint probability of a tag for each user is calculated by integrating the Bayes probability on the set of candidate tags, and the top microblogs with the highest joint probabilities are recommended to the user. Experiments using datasets from the microblog of Sina Weibo showed that our algorithm achieved good recall and precision in terms of both overall and temporal performances. A questionnaire survey proved user satisfaction with recommendation results when the cold-start problem occurred.

关键词： Recommender system Collaborative filtering Social tagging Interest evolution model

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EncyCatalogRec：针对百科文章补全的目录推荐 Article

Wei-ming LU, Jia-hui LIU, Wei XU, Peng WANG, Bao-gang WEI

《信息与电子工程前沿（英文）》 2020年第21卷第3期页码 436-447 doi: 10.1631/FITEE.1800363

摘要：目前，在线百科（如维基百科等）已提供海量且主题多样的文章。然而，部分文章内容仍不够完善。本文提出EncyCatalogRec，一种能为百科文章推荐相关目录，从而帮助用户更好完善百科内容的系统。首先，将百科文章和目录项表达为内嵌向量，基于局部敏感哈希方法检索得到相关文章，并以这些文章的目录项为候选项；然后，基于检索得到的文章及其目录项构建关系图，进一步转为乘积图；在乘积图上，将目录推荐问题转为直推式学习问题；最后，基于学习排序算法对推荐得到的目录项排序。热启动和冷启动场景实验均证实，本文所提方法性能优于已有方法。最后通过示例验证了所提方法性能。

关键词：目录推荐；百科文章补全；乘积图；直推式学习

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一种基于非线性时空效应的个性化下一个兴趣点推荐方法

孙曦,吕志民

《信息与电子工程前沿（英文）》 2023年第24卷第9期页码 1273-1286 doi: 10.1631/FITEE.2200304

摘要：下一个兴趣点（POI）推荐是基于位置的社交网络（LBSN）的一项重要任务，其目标是使用历史签到数据在特定情境下为用户推荐下一个兴趣点。现有研究将用户时空信息线性离散化，然后使用基于循环神经网络（RNN）的方法进行建模。但是这些研究忽略了时空信息对用户偏好的非线性影响以及用户轨迹和候选兴趣点之间的时空相关性。为解决这些问题，本文提出一种时空轨迹（STT）模型。该模型使用具有注意力机制的长短期记忆网络（LSTM）作为基本框架，并将时空信息以编码形式引入模型。在编码信息过程中，使用指数型衰减因子刻画用户兴趣随时间和距离的非线性漂移特性。此外，本文在目标召回过程中设计一个时空匹配模块，该模块通过测量用户历史轨迹与候选集之间的相关性来为用户筛选最有可能的下一个兴趣点。本文使用4个真实数据集评估STT模型性能。实验结果表明，本文所提方法的推荐效果比主流的推荐模型有显著提升。

关键词：兴趣点推荐时空效应长短期记忆网络注意力机制

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王旭娜,谭清美

《信息与电子工程前沿（英文）》 2020年第21卷第7期页码 963-980 doi: 10.1631/FITEE.1900236

摘要：传统推荐系统采用的协同过滤技术存在数据稀疏问题，同时传统的矩阵分解算法简单地将用户和项目分解为潜在因素的线性模型，这些局限性导致传统推荐算法推荐效果有限。在此情况下，出现了基于深度学习的推荐系统。当前深度学习推荐大多利用深度神经网络针对一些辅助信息建模，且在建模过程中根据输入数据类别，分别采用多条映射通路，将原始输入数据映射到潜在向量空间。然而，这些深度神经网络推荐算法忽略了不同类别数据间的联合作用可能对推荐效果产生的潜在影响。针对这一问题，本文提出一种基于多类别信息联合作用的前馈深度神经网络推荐方法——深度联合网络，以解决隐性反馈的推荐问题。具体来说，一方面，本文研究在模型的底层输入中不仅包含用户和项目信息，而且包含更多辅助信息。另一方面，充分考虑不同类别信息的联合作用对推荐效果的影响。在公开数据集上的实验表明，我们提出的方法对现有方法有显著改进。经验证据表明，使用深度联合推荐可以提供更好推荐性能。

关键词：神经网络；深度学习；DAN；推荐

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A solution to stochastic unit commitment problem for a wind-thermal system coordination

B. SARAVANAN,Shreya MISHRA,Debrupa NAG

《能源前沿（英文）》 2014年第8卷第2期页码 192-200 doi: 10.1007/s11708-014-0306-x

摘要： Unit commitment (UC) problem is one of the most important decision making problems in power system. In this paper the UC problem is solved by considering it as a real time problem by adding stochasticity in the generation side because of wind-thermal co-ordination system as well as stochasticity in the load side by incorporating the randomness of the load. The most important issue that needs to be addressed is the achievement of an economic unit commitment solution after solving UC as a real time problem. This paper proposes a hybrid approach to solve the stochastic unit commitment problem considering the volatile nature of wind and formulating the UC problem as a chance constrained problem in which the load is met with high probability over the entire time period.

关键词： unit commitment (UC) randomness wind generation univariate chance constrained

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Solving unit commitment problem using a novel version of harmony search algorithm

Roozbeh MORSALI,Tohid JAFARI,Amirhossein GHODS,Mohammad KARIMI

《能源前沿（英文）》 2014年第8卷第3期页码 297-304 doi: 10.1007/s11708-014-0309-7

摘要： In this context, a novel structure was proposed for improving harmony search (HS) algorithm to solve the unit comment (UC) problem. The HS algorithm obtained optimal solution for defined objective function by improvising, updating and checking operators. In the proposed improved self-adaptive HS (SGHS) algorithm, two important control parameters were adjusted to reach better solution from the simple HS algorithm. The objective function of this study consisted of operation, start-up and shut-down costs. To confirm the effectiveness, the SGHS algorithm was tested on systems with 10, 20, 40 and 60 generating units, and the obtained results were compared with those of the simple HS algorithm and other related works.

关键词： generation scheduling harmony search (HS) algorithm intelligent technique unit commitment

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Transient analysis of thermoelastic contact problem of disk brakes

Ali BELHOCINE, Mostefa BOUCHETARA

《机械工程前沿（英文）》 2013年第8卷第2期页码 150-159 doi: 10.1007/s11465-013-0266-6

摘要：

The main purpose of this study is to analyze the thermomechanical behavior of the dry contact between the brake disk and pads during the braking phase. The simulation strategy is based on computer code ANSYS11. The modeling of transient temperature in the disk is actually used to identify the factor of geometric design of the disk to install the ventilation system in vehicles. The thermal-structural analysis is then used with coupling to determine the deformation established and the Von Mises stresses in the disk, the contact pressure distribution in pads. The results are satisfactory compared to those found in the literature.

关键词： brake disks heat flux heat-transfer coefficient Von Mises stress contact pressure

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A solution to the unit commitment problem—a review

B. SARAVANAN, Siddharth DAS, Surbhi SIKRI, D. P. KOTHARI

《能源前沿（英文）》 2013年第7卷第2期页码 223-236 doi: 10.1007/s11708-013-0240-3

摘要： Unit commitment (UC) is an optimization problem used to determine the operation schedule of the generating units at every hour interval with varying loads under different constraints and environments. Many algorithms have been invented in the past five decades for optimization of the UC problem, but still researchers are working in this field to find new hybrid algorithms to make the problem more realistic. The importance of UC is increasing with the constantly varying demands. Therefore, there is an urgent need in the power sector to keep track of the latest methodologies to further optimize the working criterions of the generating units. This paper focuses on providing a clear review of the latest techniques employed in optimizing UC problems for both stochastic and deterministic loads, which has been acquired from many peer reviewed published papers. It has been divided into many sections which include various constraints based on profit, security, emission and time. It emphasizes not only on deregulated and regulated environments but also on renewable energy and distributed generating systems. In terms of contributions, the detailed analysis of all the UC algorithms has been discussed for the benefit of new researchers interested in working in this field.

关键词： unit commitment (UC) optimization deterministic load stochastic load evolutionary programming (EP) hybrid

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Hydrocele of the canal of Nuck — an old problem revisited

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《医学前沿（英文）》 2013年第7卷第4期页码 517-519 doi: 10.1007/s11684-013-0300-4

摘要：

Herein the authors describe the case of a young woman presenting with a tender lump in her groin. Clinically the differential was of either a reactive lymph node or a femoral hernia. Ultrasound scan was urgently arranged and showed a cystic lesion. Surgical exploration was carried out and revealed this to be a hydrocele of the canal of Nuck. This was excised and the patient’s symptoms resolved and she was discharged home the following day. We explore the embryology, pathophysiology and management of this rare entity.

关键词： canal of Nuck hernia embryology