资源类型

期刊论文 111

会议信息 1

会议视频 1

年份

2023 9

2022 16

2021 6

2020 5

2019 12

2018 8

2017 2

2016 4

2015 6

2014 1

2013 4

2012 5

2011 4

2010 1

2009 3

2008 5

2007 3

2006 1

2005 1

2004 7

展开 ︾

关键词

模式识别 8

宏基因组 2

模糊 2

神经网络 2

秦巴山脉区域 2

3S 1

AR模型 1

EPC(engineering procurement construction) 1

IPMT 1

PIN二极管 1

PPP模式 1

Powell法 1

RBF神经网络 1

TBM 刀盘设计 1

TBM 效率 1

square-twist折纸 1

三元结构 1

三峡工程 1

上海港 1

展开 ︾

检索范围：

排序： 展示方式：

Towards a self-adaptive service-oriented methodology based on extended SOMA

Alireza PARVIZI-MOSAED,Shahrouz MOAVEN,Jafar HABIBI,Ghazaleh BEIGI,Mahdieh NASER-SHARIAT

《信息与电子工程前沿（英文）》 2015年 第16卷 第1期   页码 43-69 doi: 10.1631/FITEE.1400040

摘要： We propose a self-adaptive process (SAP) that maintains the software architecture quality using the MAPE-K standard model. The proposed process can be plugged into various software development processes and service-oriented methodologies due to its explicitly defined inputs and outputs. To this aim, the proposed SAP is integrated with the service-oriented modeling and application (SOMA) methodology in a two-layered structure to create a novel methodology, named self-adaptive service-oriented architecture methodology (SASOAM), which provides a semi-automatic self-aware method by the composition of architectural tactics. Moreover, the maintenance activity of SOMA is improved using architectural and adaptive patterns, which results in controlling the software architecture quality. The improvement in the maintainability of SOMA is demonstrated by an analytic hierarchy process (AHP) based evaluation method. Furthermore, the proposed method is applied to a case study to represent the feasibility and practicality of SASOAM.

关键词： Quality attribute     Adaptation pattern     Architectural tactic     Service-oriented architecture     Self-adaptive process     Architectural pattern    

HTML PDF 收藏

Nonlinear design-point performance adaptation approaches and their comparisons for gas turbine applications

Y. G. LI, P. PILIDIS,

《能源前沿（英文）》 2009年 第3卷 第4期   页码 446-455 doi: 10.1007/s11708-009-0042-9

摘要： Accurate performance simulation and understanding of gas turbine engines is very useful for gas turbine manufacturers and users alike and such a simulation normally starts from its design point. When some of the engine component parameters for an existing engine are not available, they must be estimated in order that the performance analysis can be started. Therefore, the simulated design point performance of an engine may be slightly different from its actual performance. In this paper, two nonlinear gas turbine design-point performance adaptation approaches have been presented to best estimate the unknown component parameters and match available design point engine performance, one using a nonlinear matrix inverse adaptation method and the other using a Genetic Algorithm-based adaptation approach. The advantages and disadvantages of the two adaptation methods have been compared with each other. In the approaches, the component parameters may be compressor pressure ratios and efficiencies, turbine entry temperature, turbine efficiencies, engine mass flow rate, cooling flows, and by-pass ratio, etc. The engine performance parameters may be thrust and SFC for aero engines, shaft power, and thermal efficiency for industrial engines, gas path pressures, temperatures, etc. To select the most appropriate to-be-adapted component parameters, a sensitivity bar chart is used to analyze the sensitivity of all potential component parameters against the engine performance parameters. The two adaptation approaches have been applied to a model gas turbine engine. The application shows that the sensitivity bar chart is very useful in the selection of the to-be-adapted component parameters, and both adaptation approaches are able to produce good quality engine models at design point. The comparison of the two adaptation methods shows that the nonlinear matrix inverse method is faster and more accurate, while the genetic algorithm-based adaptation method is more robust but slower. Theoretically, both adaptation methods can be extended to other gas turbine engine performance modelling applications.

关键词： gas turbine     engine     performance adaptation     performance matching     design-point performance simulation     influence coefficient matrix     genetic algorithm    

HTML PDF 收藏

双向协同的去中心化多源域自适应 Research Article

魏义康1,2,韩亚洪1,2

《信息与电子工程前沿（英文）》 2022年 第23卷 第12期   页码 1780-1794 doi: 10.1631/FITEE.2200284

摘要： 去中心化多源域自适应是指在数据去中心化场景下执行无监督多源域自适应。数据去中心化的挑战是源域与目标域在训练中缺乏跨域协同。对于无标签的目标域，目标域模型需要在源域模型的协助下迁移监督知识，而域差距会导致源域模型的适应性能有限。对于有标签的源域，源域模型在数据去中心化场景下倾向于过拟合本地数据，从而导致负迁移问题。对于以上挑战，提出双向协同的去中心化多源域自适应方法，通过其它域模型的协助进行局部源域模型与局部目标域模型的协同训练与聚合。对于目标域，我们在源域模型的协助下蒸馏监督知识，同时完全利用无标签目标域的数据来缓解域偏移问题。对于源域，我们在目标域模型的协助下正则化源域模型来避免负迁移问题。以上过程在去中心化的源域和目标域之间形成一种双向协同，以便在数据去中心化场景下提升域自适应性能。在标准多源域自适应数据集上的实验表明，我们的方法以较大优势优于现有的多源域自适应方法。

关键词： 多源域自适应；数据去中心化；域偏移；负迁移    

HTML PDF 收藏

Comments on “Adaptation of Chinese and German maize-based food-feed-energy systems to limited phosphate

null

《农业科学与工程前沿（英文）》 2019年 第6卷 第4期   页码 443-444 doi: 10.15302/J-FASE-2019288

HTML PDF 收藏

无监督域自适应的动态参数化学习 Research Article

蒋润华1,2,韩亚洪1,2

《信息与电子工程前沿（英文）》 2023年 第24卷 第11期   页码 1616-1632 doi: 10.1631/FITEE.2200631

摘要： 无监督领域自适应通过学习域不变表示实现神经网络从有标签数据组成的源域到无标签数据组成的目标域迁移。近期研究通过直接匹配这两个域的边缘分布实现这一目标。然而，已有研究大多数忽略域对齐和语义判别学习之间的动态平衡，因此容易受负迁移和异常样本影响。为解决这些问题，引入动态参数化学习框架。首先，通过探索领域级语义知识，提出动态对齐参数自适应地调整域对齐和语义判别学习的优化过程。此外，为获得判别能力强和域不变的表示，提出在源域和目标域上对齐优化过程。本文通过综合实验证明了所提出方法的有效性，并在3个视觉任务的7个数据集上进行广泛比较，证明可行性。

关键词： 无监督领域自适应；优化步骤；跨域判别表示；语义判别    

HTML PDF 收藏

Subsurface damage pattern and formation mechanism of monocrystalline -GaO in grinding process

《机械工程前沿（英文）》 2022年 第17卷 第2期 doi: 10.1007/s11465-022-0677-3

摘要： Monocrystalline beta-phase gallium oxide (β-Ga2O3) is a promising ultrawide bandgap semiconductor material. However, the deformation mechanism in ultraprecision machining has not yet been revealed. The aim of this study is to investigate the damage pattern and formation mechanism of monocrystalline β-Ga2O3 in different grinding processes. Transmission electron microscopy was used to observe the subsurface damage in rough, fine, and ultrafine grinding processes. Nanocrystals and stacking faults existed in all three processes, dislocations and twins were observed in the rough and fine grinding processes, cracks were also observed in the rough grinding process, and amorphous phase were only present in the ultrafine grinding process. The subsurface damage thickness of the samples decreased with the reduction in the grit radius and the grit depth of cut. Subsurface damage models for grinding process were established on the basis of the grinding principle, revealing the mechanism of the mechanical effect of grits on the damage pattern. The formation of nanocrystals and amorphous phase was related to the grinding conditions and material characteristics. It is important to investigate the ultraprecision grinding process of monocrystalline β-Ga2O3. The results in this work are supposed to provide guidance for the damage control of monocrystalline β-Ga2O3 grinding process.

关键词： monocrystalline beta-phase gallium oxide     grinding process     subsurface damage     nanocrystals     amorphous phase    

HTML PDF 收藏

SHIFTING TO A RECOMMENDED DIETARY PATTERN COULD PROMOTE SUSTAINABLE DEVELOPMENT OF THE ENVIRONMENT AND

《农业科学与工程前沿（英文）》 2023年 第10卷 第1期   页码 73-82 doi: 10.15302/J-FASE-2023489

摘要：

● Shifting from the existing dietary patterns to the alternative recommended dietary pattern could enhance the sustainable development of environment and human health.

关键词： CHNS data     cluster analysis     dietary patterns     sustainable development    

HTML PDF 收藏

The influence of hand hole on the ultimate strength and crack pattern of shield tunnel segment joints

Shaochun WANG, Xi JIANG, Yun BAI

《结构与土木工程前沿（英文）》 2019年 第13卷 第5期   页码 1200-1213 doi: 10.1007/s11709-019-0546-2

摘要： With the shield tunnel going deeper and deeper, the circumferential axial force becomes the governing factor rather than the bending moment. The hand hole acts as a weak point and initial damage in the segment joint especially when the circumferential axial force is extremely high. Despite the wide application of steel fiber or synthetic fiber in the tunneling, limited researches focus on the structural responses of segment joint with macro structural synthetic fiber (MSSF). In this paper, a 1:2 reduced-scale experiment was conducted to study the structural performance of the segment joint with different types of hand holes under ultra-high axial force. Special attention is paid to failure mode and structural performance (bearing capacity, deformation, cracking, and toughness). Moreover, segment joints with MSSF are also tested to evaluate the effects of MSSF on the failure mode and structural performance of the segment joints. The experiment results show that the hand hole becomes the weakest point of the segment joint under ultra-high axial force. A \ /-type crack pattern is always observed before the final failure of the segment joints. Different types and sizes of the hand hole have different degree of influences on the structural behavior of segment joints. The segment joint with MSSF shows higher ultimate bearing capacity and toughness compared to segment joint with common concrete. Besides, the MSSF improves the initial cracking load and anti-spallling resistance of the segment joint.

关键词： shield tunneling     structural synthetic fiber concrete     hand hole     segment joint     ultimate bearing capacity     crack pattern    

HTML PDF 收藏

模糊中心聚类的模式识别学习方法

曾黄麟,袁慧,刘小芳

《中国工程科学》 2004年 第6卷 第11期   页码 33-37

摘要：

基于一个约束条件下的非线性规划问题的优化计算思想，把模糊中心聚类中计算输入矢量与中心的距离来实现聚类作为一种优化计算问题，证明了模糊中心聚类方法，取一个适当的属函数，其聚类中心vi为模糊聚类中心价值函数的极小值，推导出了基于模糊中心聚类的模式识别的无导师递推学习方法，提出了模糊中心聚类模式分类神经网络结构，该网络可以实现并行数据处理和模式分类的软划分和硬划分。

关键词： 模糊     中心聚类     模式识别     神经网络    

HTML PDF 收藏

Distinct gene expression pattern of mutations coordinated by target repression and promoter hypermethylation

《医学前沿（英文）》 2022年 第16卷 第4期   页码 627-636 doi: 10.1007/s11684-020-0815-4

摘要： Runt-related transcription factor 1 (RUNX1) is an essential regulator of normal hematopoiesis. Its dysfunction, caused by either fusions or mutations, is frequently reported in acute myeloid leukemia (AML). However, RUNX1 mutations have been largely under-explored compared with RUNX1 fusions mainly due to their elusive genetic characteristics. Here, based on 1741 patients with AML, we report a unique expression pattern associated with RUNX1 mutations in AML. This expression pattern was coordinated by target repression and promoter hypermethylation. We first reanalyzed a joint AML cohort that consisted of three public cohorts and found that RUNX1 mutations were mainly distributed in the Runt domain and almost mutually exclusive with NPM1 mutations. Then, based on RNA-seq data from The Cancer Genome Atlas AML cohort, we developed a 300-gene signature that significantly distinguished the patients with RUNX1 mutations from those with other AML subtypes. Furthermore, we explored the mechanisms underlying this signature from the transcriptional and epigenetic levels. Using chromatin immunoprecipitation sequencing data, we found that RUNX1 target genes tended to be repressed in patients with RUNX1 mutations. Through the integration of DNA methylation array data, we illustrated that hypermethylation on the promoter regions of RUNX1-regulated genes also contributed to dysregulation in RUNX1-mutated AML. This study revealed the distinct gene expression pattern of RUNX1 mutations and the underlying mechanisms in AML development.

关键词： RUNX1     gene mutation     acute myeloid leukemia     transcriptional repression     DNA methylation    

HTML PDF 收藏

面向语义的精简化多关系频繁模式发现方法

杨炳儒,张伟,钱榕

《中国工程科学》 2008年 第10卷 第9期   页码 47-53

摘要：

多关系频繁模式发现能够直接从复杂结构化数据中发现涉及多个关系的复杂频繁模式，避免了传统方法的局限。有别于主流基于归纳逻辑程序设计技术的方法，提出了基于合取查询包含关系的面向语义的精简化多关系频繁模式发现方法，具有理论与技术基础的新颖性，解决了两种语义冗余问题。实验表明，该方法在可理解性、功能、效率以及可扩展性方面具有优势。

关键词： 多关系数据挖掘     频繁模式发现     合取查询     精简化模式    

HTML PDF 收藏

F-FDG-PET glucose hypometabolism pattern in patients with epileptogenic hypothalamic hamartoma

《医学前沿（英文）》 2021年 第15卷 第6期   页码 913-921 doi: 10.1007/s11684-021-0874-1

摘要： Epileptogenic hypothalamic hamartoma is characterized by intractable gelastic seizures. A systematic analysis of the overall brain metabolic pattern in patients with hypothalamic hamartoma (HH) could facilitate the understanding of the epileptic brain network and the associated brain damage effects of HH. In this study, we retrospectively evaluated 27 patients with epileptogenic HH (8 female patients; age, 2–33 years) by using 18F-fluorodeoxyglucose-positron emission tomography. The correlations among tomography result, seizure type, sex, and structural magnetic resonance imaging were assessed. Whole metabolic patterns and voxel-based morphometry findings were assessed by group analysis with healthy controls. Assessment of the whole metabolic pattern in patients with HH revealed several regional metabolic reductions in the cerebrum and an overall metabolic reduction in the cerebellum. In addition, areas showing hypometabolism in the neocortex were more widely distributed ipsilaterally than contralaterally to the HH. Reductions in glucose metabolism and gray matter volume in the neocortex were predominant ipsilateral to the HH. In conclusion, the glucose hypometabolism pattern in patients with epileptogenic HH involved the neocortex, subcortical regions, and cerebellum. The characteristics of glucose hypometabolism differed across seizure type and sex. Reductions in glucose metabolism and structural changes may be based on different mechanisms, but both are likely to occur ipsilateral to the HH in the neocortex. We hypothesized that the dentato-rubro-thalamic tract and cerebro-ponto-cerebellar tract, which are responsible for intercommunication between the cerebral cortex, subcortical regions, and cerebellar regions, may be involved in a pathway related to seizure propagation, particularly gelastic seizures, in patients with HH.

关键词： hypothalamic hamartoma     gelastic seizure     fluorodeoxyglucose-positron emission tomography     voxel-based morphometry    

HTML PDF 收藏

Invasive mucinous adenocarcinoma with lepidic-predominant pattern coexisted with tuberculosis: a case

null

《医学前沿（英文）》 2018年 第12卷 第3期   页码 330-333 doi: 10.1007/s11684-017-0545-4

摘要：

We observed a rare case of invasive mucinous adenocarcinoma (IMA) with a lepidic-predominant pattern accompanied by pulmonary tuberculosis. An 85-year-old man with repeated cough and sputum was admitted to Xinhua Hospital. T-SPOT test result was 212 pg/ml (reference value of negative is<14 pg/ml), culture was positive, and tuberculin skin test (PPD) was negative (skin induration<5 mm). The patient was treated with several courses of antibiotics and anti-tuberculosis treatments. Repeated chest CT scans showed disease progression. Bronchoscopy yielded negative results. PET-CT scans showed negative results. A percutaneous lung biopsy revealed mucin-secreting cells lining the alveolar walls. IMA with a lepidic-predominant pattern was diagnosed after invasiveness was found after experimental treatments. Simultaneous occurrence of pulmonary tuberculosis and lung cancer are common; however, the present case of IMA having a lepidic-predominant pattern and coexisting with active tuberculosis has not been reported yet.

关键词： invasive mucinous adenocarcinoma     lepidic-predominant     tuberculosis    

HTML PDF 收藏

基于条件模式的一种无分组并行频繁模式挖掘算法 Regular Papers-Research Articles

Zhe-jun KUANG, Hang ZHOU, Dong-dai ZHOU, Jin-peng ZHOU, Kun YANG

《信息与电子工程前沿（英文）》 2019年 第20卷 第9期   页码 1234-1245 doi: 10.1631/FITEE.1800467

摘要： 频繁项集挖掘是关联规则挖掘的主要方法。由于计算空间和性能限制，特别是当数据集剧增时，挖掘频繁项的关联需要大量时间和资源。在大数据环境下的关联数据挖掘过程中，通常采用MapReduce模型进行任务划分及并行处理，从而提高算法执行效率。为确保关联规则在任务划分和并行处理期间不被破坏，需要将内部关系数据存储在计算机空间中。与原始数据集相比，存储冗余的内部关系数据将显著增加空间的使用。研究发现，频繁模式挖掘算法的形成主要依赖于条件模式基。基于并行频繁模式（PFP）算法理论，本文提出一种无分组的PFP（NG-PFP）挖掘算法。该算法取消了分组模式，减少了子任务之间的数据冗余。实验结果表明，无分组模型在计算效率和空间利用率方面都有显著提高。

关键词： 频繁模式挖掘；并行算法；条件模式基；MapReduce；大数据    

HTML PDF 收藏

蓄流分离式灌溉模式研究与实践

张江辉,周和平,徐小波,姚新华

《中国工程科学》 2008年 第10卷 第9期   页码 25-30

摘要：

蓄流分离式灌溉是基于稀植性果树园艺类经济作物需水特性和要求，近年创新提出并实施技术试验与实践的节水灌溉新模式。综述了蓄流分离式灌溉模式基本理念；阐述了蓄流灌溉系统关键技术——蓄流分离式灌水器；分析了蓄流灌溉模式的节水增产、节能降耗、提升灌溉水温以及解决低水头条件下的灌溉均匀性等综合技术效应，指出今后蓄流灌溉模式应着力研究的主要问题。

关键词： 节水农业     蓄流分离式灌溉模式     创新研究     实践    

HTML PDF 收藏

标题 作者 时间 类型 操作

Towards a self-adaptive service-oriented methodology based on extended SOMA

Alireza PARVIZI-MOSAED,Shahrouz MOAVEN,Jafar HABIBI,Ghazaleh BEIGI,Mahdieh NASER-SHARIAT

期刊论文

Nonlinear design-point performance adaptation approaches and their comparisons for gas turbine applications

Y. G. LI, P. PILIDIS,

期刊论文

双向协同的去中心化多源域自适应

魏义康1,2,韩亚洪1,2

期刊论文

Comments on “Adaptation of Chinese and German maize-based food-feed-energy systems to limited phosphate

null

期刊论文

无监督域自适应的动态参数化学习

蒋润华1,2,韩亚洪1,2

期刊论文

Subsurface damage pattern and formation mechanism of monocrystalline -GaO in grinding process

期刊论文

SHIFTING TO A RECOMMENDED DIETARY PATTERN COULD PROMOTE SUSTAINABLE DEVELOPMENT OF THE ENVIRONMENT AND

期刊论文

The influence of hand hole on the ultimate strength and crack pattern of shield tunnel segment joints

Shaochun WANG, Xi JIANG, Yun BAI

期刊论文

模糊中心聚类的模式识别学习方法

曾黄麟,袁慧,刘小芳

期刊论文

Distinct gene expression pattern of mutations coordinated by target repression and promoter hypermethylation

期刊论文

面向语义的精简化多关系频繁模式发现方法

杨炳儒,张伟,钱榕

期刊论文

F-FDG-PET glucose hypometabolism pattern in patients with epileptogenic hypothalamic hamartoma

期刊论文

Invasive mucinous adenocarcinoma with lepidic-predominant pattern coexisted with tuberculosis: a case

null

期刊论文

基于条件模式的一种无分组并行频繁模式挖掘算法

Zhe-jun KUANG, Hang ZHOU, Dong-dai ZHOU, Jin-peng ZHOU, Kun YANG

期刊论文

蓄流分离式灌溉模式研究与实践

张江辉,周和平,徐小波,姚新华

期刊论文