检索结果-南通市图书馆

从零样本学习理论模型到工业应用——动机、演变与挑战

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

控制与决策 2024年第9期39卷 2833-2857页

作者：赵健程冯良骏岳嘉祺张堡霖赵春晖付永鹏王福利浙江大学控制科学与工程学院杭州310027 浙江大学工业控制技术全国重点实验室杭州310027 东北大学信息科学与工程学院沈阳110819

随着工业大数据技术的发展,应用于工业对象的有监督方法得到广泛研究.真实数据往往遵循长尾类分布,导致传统有监督模型在实际应用过程中存在模型退化以及模型失效等问题.零样本学习(zero-shot learning,ZSL)技术的提出为这一问题提供了... 详细信息

随着工业大数据技术的发展,应用于工业对象的有监督方法得到广泛研究.真实数据往往遵循长尾类分布,导致传统有监督模型在实际应用过程中存在模型退化以及模型失效等问题.零样本学习(zero-shot learning,ZSL)技术的提出为这一问题提供了一种新的解决思路.零样本学习的目标是使用收集到的已见类别数据训练模型,使得训练好的模型对于收集不到数据的未见类别同样适用.零样本学习通过将故障的文本描述等辅助知识引入到模型中,一定程度上缓解了模型在实际工业场景中对训练数据收集的依赖,提高了模型的泛化性能.然而,目前领域内尚缺乏对零样本学习在工业领域应用的系统梳理与讨论,而工业零样本学习在辅助知识的收集和处理、研究方法、应用场景等方面与其他领域的零样本学习相比也具有独特性.鉴于零样本学习在工业领域潜在的巨大应用价值和未来的发展潜力,系统性梳理和展示了从零样本学习理论模型到工业应用的动机、演变与挑战.首先,回顾零样本学习设定与相关方法的发展脉络,分析零样本学习与其他任务设定之间的关联,并指出本文与前人综述的区别.接下来,回顾工业领域零样本学习的研究现状,介绍典型的工业零样本学习任务和辅助知识,分析工业零样本学习的特征和典型问题,梳理工业领域零样本任务中应用的现有方法.此外,梳理工业零样本任务的基准数据集和开源工作.最后,在现有研究的基础上总结工业零样本任务面临的问题与挑战,并对该领域的研究做出展望.

关键词：零样本学习迁移学习工业人工智能机器学习故障诊断缺陷检测

Numerical simulation study on the mold strength of magnetic mold casting based on a coupled electromagnetic-structural method

在线全文

学校读者我要写书评

暂无评论

China Foundry 2024年第5期21卷 577-587页

作者： Wei-li Peng jian-hua zhao cheng Gu Ya-jun Wang College of Materials Science and Engineering Chongqing UniversityChongqing 400045China National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China National Key Laboratory of Advanced Casting Technologies Chongqing UniversityChongqing 400044China

The properties of the magnetic mold in magnetic mold casting directly determine the quality of the final cast *** this study,the magnetic mold properties in magnetic mold casting,were studied utilizing a coupled electromagnetic-structural method through numerical *** study investigated key factors including equivalent stress,the distribution of tensile and compressive stresses,and the area ratio of tensile *** compared molds made entirely of magnetic materials with those made partially of magnetic *** results indicate that as current increases from 4 A to 8 A,both the initial magnetic mold and the material-replaced magnetic mold initially show an increasing trend in equivalent stress,tensile-compressive stress,and the area ratio of tensile stress,peaking at 6 A before *** material replacement,the area ratio of tensile stress at 6 A decreases to 19.84%,representing a reduction of 29.72%.Magnetic molds comprising a combination of magnetic and non-magnetic materials exhibit sufficient strength and a reduced area ratio of tensile stress compared to those made entirely from magnetic *** study provides valuable insights for optimizing magnetic mold casting processes and offers practical guidance for advancing the application of magnetic molds.

关键词： magnetic mold casting coupled electromagnetic-structural method numerical simulation stress analysis

Manipulating the Phase Transition Behavior of Dual Temperature-Responsive Block Copolymers by Adjusting Composition and Sequence

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2024年第2期42卷 176-187,I0006页

作者： Zhi Zou Xiang Xu Hai-Tao zhao jian-Nan cheng Wei-Wei He Li-Fen Zhang Zhen-Ping cheng Suzhou key Laboratory of Macromolecular Design and Precision Synthesis Jiangsu Key Laboratory of Advanced Functional Polymer Design and ApplicationState and Local Joint Engineering Laboratory for Novel Functional Polymeric MaterialsCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou215123China State Key Laboratory of Radiation Medicine and Protection School for Radiological and Interdisciplinary Sciences(RAD-X)and Collaborative Innovation Center of Radiation Medicine of JiangsuSoochow UniversitySuzhou215123China

Temperature-responsive polymers have garnered significant attention due to their ability to respond to external *** this work,dual temperature-responsive block copolymers are synthesized via reversible addition-fragmentation chain transfer polymerization(RAFT)polymerization utilizing zwitterionic monomer methacryloyl ethyl sulfobetaine(SBMA) and N-isopropyl acrylamide(NIPAAm) as *** thermal responsive behaviors can be easily modulated by incorporating additional hydrophobic monomer benzyl acrylate(BN) or hydrophilic monomer acrylic acid(AA),adjusting concentration or pH,or varying the degree of polymerization of the block chain *** cloud points of the copolymers are determined by UV-Vis spectrophotometry,and these copolymers exhibit both controlled upper and lower critical solu bility temperatures(LCST and UCST) in aqueous *** study analyzes and summarizes the influencing factors of dual temperature responsive block copolymers by exploring the effects of various conditions on the phase transition temperature of temperature-sensitive polymers to explore the relationship between their properties and environment and structure to make them more selective in terms of temperature application range and regulation *** is very interesting that the introduction of poly-acrylic acid(PAA) segments in the middle of di-block copolymer PSBMA_(55)-b-PNIPAAm_(80) to form PSBMA_(55)-b-PAA_(x)-b-PNIPAAm_(80) results in a reversal of temperature-responsive behaviors from 'U'(LCST UCST) type,while the copolymer PSBMA_(55)-b-P(NIPAAm_(80)-co-AA_(x)) *** work provides a clue for tuning the phase transition behavior of polymers for manufacture of extreme smart materials.

关键词： Temperature responsive polymers High critical solubility temperature(UCST) Low critical solubility temperature(LCST) Block copolymers

Quantitative characterizations of anisotropic dynamic properties in organic-rich shale with different kerogen content

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2024年第2期21卷 855-865页

作者： jian-Yong Xie Yan-Ping Fang Xing-Hua Wu jian'er zhao Jun-cheng Dai Jun-Xing Cao Ji-Xin Deng State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of TechnologyChengdu610059SichuanChina Key Lab of Earth Exploration&Information Techniques of Ministry of Education Geophysical InstituteChengdu University of TechnologyChengdu610059SichuanChina PetroChina Southwest Oil&Gasfield Company Chengdu610017SichuanChina

Understanding the quantitative responses of anisotropic dynamic properties in organic-rich shale with different kerogen content(KC)is of great significance in hydrocarbon exploration and *** controlled experiments with a single variable is challenging for natural shales due to their high variations in components,diagenesis conditions,or pore *** employed the hot-pressing technique to construct 11 well-controlled artificial shale with varying *** artificial shale samples were successive machined into prismatic shape for ultrasonic measurements along different *** revealed bedding perpendicular P-wave velocities are more sensitive to the increasing KC than bedding paralleling velocities due to the preferential alignments of *** elastic stiffnesses except C_(13)are generally decreasing with the increasing KC,the variation of C_(1) and C_(33)on kerogen content are more sensitive than those of C_(44)and C_(66).Apparent dynamic mechanical parameters(v and E)were found to have linear correlation with the true ones from complete anisotropic equations independent of KC,which hold value towards the interpretation of well logs consistently across formations,Anisotropic mechanical parameters(ΔE and brittlenessΔB)tend to decrease with the reducing KC,withΔB showing great sensitivity to KC *** the range of low KC(10%)shale,compilation of data from natural organic rich-shales globally verified the similar systematic relationships that can be empirically used to predict the fraction of KC in shales.

关键词： Elastic properties Organic shale Anisotropy Kerogen content Physical modeling

Prognostic Factors of Gastrointestinal Stromal Tumors： A Single Institutional Retrospective Experience with Surgical Management over 20 Years

在线全文

学校读者我要写书评

暂无评论

Clinical oncology and cancer researeh 2010年第3期7卷 175-180页

作者： Yong-kai WU Dong-bing zhao cheng-feng WANG jian-qiang CAI Yong-fu SHAO Ping zhao Department of Abdominal Surgical Oncology Cancer Hospital Chinese Academy of Medical Sciences and Peking Union Medical College Beijing 100021 China.

OBJECTIVE To analyze the pathological features and prognosis factors of gastrointestinal stromal tumor （GIST） after primary resection. METHODS Medical records of the diagnosis, surgery, and follow-up of 327 patients with GISTs who underwent surgery between 1988 and 2007 were retrospectively reviewed. The predic-tive factors for the survival of these patients were identi. ed using multivariate analysis. RESULTS In the 327 tumors, 152 （46.5%） were located in the stomach, 89 （27.2%） in the small intestine, 33 （10.1%） in the colon and rectum, and 43 （13.1%） in other sites including the omentum and mesentery. The 3-year and 5-year overall survival rates of the 327 GIST patients were 74.4% and 62.7%, respectively, and univariate survival analysis demonstrated that factors, such as tumor size, mitotic index, NIH categories, Ki-67 index, tumor location, surgical margins, tumor bleeding, and tumor necrosis have significant effect on survival of the patients （P 〈 0.05）. Multivariate analysis demonstrated that the NIH categories, surgical margins, and Ki-67 index were independent prognostic factors for the survival rate. In the group of patients with postoperative recurrence or metastasis, the median survival time of patients who did not receive imatinib treatment was 30 months and that of patients who received imatinib treatment was 59 months. Their 5-year survival rates were 16.4% and 39.4%, respectively, and the difference was statistically significant （P = 0.017）. CONCLUSION Complete resection is the .rst choice of treat-ment for GISTs. It is reasonable to evaluate the prognosis of resect-able GISTs and guide the adjunctive therapy with NIH categories and Ki-67 index. Imatinib treatment can *** increase the survival rate of patients with recurrent and metastatic GISTs.

关键词： gastrointestinal stromal tumors prognostic factors surgical management survival adjuvant therapy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第8期35卷 25-35页

作者： Yatian Deng Dao Wang Jinglan cheng Yunkun zhao Zongbao Li Chunyan Zang jian Li Lichao Jia School of Materials Science and Engineering State Key Lab of Material Processing and Die&Mould TechnologyHuazhong University of Science and TechnologyWuhan 430074China College of Science Qiongtai Normal UniversityHaikou 571127China Kunming Sino-Platinum Metals Catalyst Co. Ltd.Kunming 650106China State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and TechnologyWuhan 430074China

Catalyst with high performance has drawn increasing attention recently due to its significant advantages in chemical reactions such as speeding up the reaction,lowering the reaction temperature or pressure,and proceeding without itself being *** the superior catalytic performance of precious metal catalysts,transition metal oxides offer a promising route for substitution of precious metals in catalysis arising from their low cost,intrinsic activity and sufficient ***-type oxide SmMn_(2)O_(5) exhibits a unique crystal structure containing double crystalline fields,and nowadays is used widely as the catalyst in different chemical reactions,including the reactions of vehicle emissions reduction and oxygen evolution reaction,gas sensors,and metal-air batteries,promoting attention in catalytic perfor-mance *** our knowledge,there is no review article covering the comprehensive informa-tion of SmMn2 O 5 and its *** we review the recent progress in understanding of the crys-tal structure of SmMn_(2)O_(5) and its basic physical *** then summarize the catalytic sources of SmMn_(2)O_(5) and reaction mechanisms,while the strategies to improve catalytic performance of SmMn_(2)O_(5) are further ***,we provide a perspective on how to make further progress in catalytic applications.

关键词： Catalyst SmMn_(2)O_(5) Mullite-type oxide Catalytic oxidation Oxygen reduction reaction Oxygen evolution reaction Reaction mechanisms

Highly Aromatic Norditerpenoid Heterodimers and Monomers from Trigonostemon fragilis

在线全文

学校读者我要写书评

暂无评论

Engineering 2024年第7期38卷 144-154页

作者： Jun-Su Zhou Long cheng Yuan Gao Zhan-Peng Ge Bin Zhou Jing-Ya Li Jin-Xin zhao jian-Min Yue State Key Laboratory of Drug Research Shanghai Institute of Materia MedicaChinese Academy of SciencesShanghai 201203China Shandong Laboratory of Yantai Drug Discovery Bohai Rim Advanced Research Institute for Drug DiscoveryYantai 264117China

Four new norditerpenoid heterodimers with different dimerization patterns-namely,trigofragiloids A-C(denoted as compounds 1-3)and(+)-and(-)-trigofragiloid D(compound 4)-and three new phenanthrenone norditerpenoids-namely,trigofragiloids E-G(compounds 5-7)-were isolated from Trigonostemon *** 1 and 2 feature a novel heterodimeric carbon skeleton formed by the conjugation of a tetra-norditerpenoid and an ennea-norditerpenoid;they have been identified as class 2 atropisomers by means of quantum chemical *** 3 is an unprecedented phenylpropanoid-norditerpenoid adduct with a new dimerization ***(+)-and(-)-4 are the first example of S-shaped 1,4-dioxane-fused norditerpenoid *** by the structure elucidation of compound 4,two co-occurring analogues,actephilol A and epiactephilol A,were structurally revised as a pair of geometrical isomers and were identified as two pairs of enantiomers,(+)-and(-)-8 and(+)-and(-)-9,*** structures were characterized using a combined ***,compound 7 exhibits remarkable adenosine triphosphate-citrate lyase(ACLY)inhibition with a halfmaximal inhibition concentration(IC50)value of(0.46±0.11)lmol·L^(-1),as active as the positive control BMS-303141,and a molecular docking study offers deep insight into the interaction between compound 7 and ACLY.

关键词： Norditerpenoid heterodimer Trigonostemon fragilis Euphorbiaceae Trigofragiloid Structural revision Adenosine triphosphate-citrate lyase(ACLY) inhibitory activity

Diagnostic value of two dimensional shear wave elastography combined with texture analysis in early liver fibrosis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2019年第10期7卷 1122-1132页

作者： zhao-cheng jian Jin-Feng Long Yu-jiang Liu Xiang-Dong Hu Ji-Bin Liu Xian-Quan Shi Wei-Sheng Li Lin-Xue Qian Department of Ultrasound Beijing Friendship HospitalCapital Medical UniversityBeijing 100050China Medical Imaging Center Affiliated Hospital of Weifang Medical UniversityWeifang 261031Shandong ProvinceChina Institute of Ultrasound Thomas Jefferson University HospitalPhiladelphiaPA 19107United States

BACKGROUND Staging diagnosis of liver fibrosis is a prerequisite for timely diagnosis and therapy in patients with chronic hepatitis *** recent years,ultrasound elastography has become an important method for clinical noninvasive assessment of liver fibrosis stage,but its diagnostic value for early liver fibrosis still needs to be further *** this study,the texture analysis was carried out on the basis of two dimensional shear wave elastography(2D-SWE),and the feasibility of 2D-SWE plus texture analysis in the diagnosis of early liver fibrosis was *** To assess the diagnostic value of 2D-SWE combined with textural analysis in liver fibrosis *** This study recruited 46 patients with chronic hepatitis *** underwent 2DSWE and texture analysis;Young's modulus values and textural patterns were obtained,*** pattern was analyzed with regard to contrast,correlation,angular second moment(ASM),and *** results of biopsy specimens were the gold standard;comparison and assessment of the diagnosis efficiency were conducted for 2D-SWE,texture analysis and their *** 2D-SWE displayed diagnosis efficiency in early fibrosis,significant fibrosis,severe fibrosis,and early cirrhosis(AUC>0.7,P0.7,P0.05).Combined diagnosis(PRE)displayed diagnostic efficiency(AUC>0.7,P<0.01)for all fibrosis stages with respective AUC of 0.952(0.841-0.994),

关键词： Elastography Two-dimensional shear wave Texture analysis Liver fibrosis,Staging

The RNA-binding domain of DCL3 is required for long-distance RNAi signaling

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

aBIOTECH 2024年第1期5卷 17-28页

作者： Jie Li Bo-Sen Zhang Hua-Wei Wu cheng-Lan Liu Hui-Shan Guo jian-Hua zhao State Key Laboratory of Plant Genomics Institute of MicrobiologyChinese Academy of SciencesBeijing 100101China CAS Center for Excellence in Biotic Interactions University of the Chinese Academy of SciencesBeijing 100049China Qilu Zhongke Academy of Modern Microbiology Technology Jinan 250022China

Small RNA(sRNA)-mediated RNA silencing(also known as RNA interference,or RNAi)is a conserved mechanism in eukaryotes that includes RNA degradation,DNA methylation,heterochromatin formation and protein translation *** plants,sRNAs can move either cell-to-cell or systemically,thereby acting as mobile silencing signals to trigger noncell autonomous ***,whether and what proteins are also involved in noncell autonomous silencing have not been *** this study,we utilized a previously reported inducible RNAi plant,PDSi,which can induce systemic silencing of the endogenous PDS gene,and we demonstrated that DCL3 is involved in systemic PDS silencing through its RNA binding *** confirmed that the C-terminus of DCL3,including the predicted RNA-binding domain,is capable of binding short *** affecting RNA binding,but not processing activity,reduced systemic PDS silencing,indicating that DCL3 binding to RNAs is required for the induction of systemic *** mosaic virus infection assays showed that the RNA-binding activity of DCL3 is required for antiviral RNAi in systemically noninoculated *** findings demonstrate that DCL3 acts as a signaling agent involved in noncell autonomous silencing and an antiviral effect in addition to its previously known function in the generation of 24-nucleotide sRNAs.

关键词： RNAi signaling DCL3 RBD RNAs Cucumber mosaic virus