Bulging Performance and Quality Control of Aluminum Alloy Tailor-welded Overlapping Sheets Based on Interface Friction

In order to solve the problem of poor formability caused by different materials and properties in the process of tailor-welded sheets forming,a forming method was proposed to change the stress state of tailor-welded sheets by covering the tailor-welded sheets with better plastic properties overlapping sheets.At the same time,the interface friction effect between the overlapping and tailor-welded sheets was utilized to control the stress magnitude and further improve the formability and quality of the tailor-welded sheets.In this work,the bulging process of the tailor-welded overlapping sheets was taken as the research object.Aluminum alloy tailor-welded overlapping sheets bulging specimens were studied by a combination of finite element analysis and experimental verification.The results show that the appropriate use of interface friction between tailor-welded and overlapping sheets can improve the formability of tailor-welded sheets and control the flow of weld seam to improve the forming quality.When increasing the interface friction coefficient on the side of tailor-welded sheets with higher strength and decreasing that on the side of tailor-welded sheets with lower strength,the deformation of the tailor-welded sheets are more uniform,the offset of the weld seam is minimal,the limit bulging height is maximal,and the forming quality is optimal.

Overlap吻合与π吻合在全腹腔镜全胃切除术中的应用

目的:比较Overlap吻合与π吻合在全腹腔镜全胃切除术(TLTG)中的应用效果。方法:选择2019年2月至2022年2月在成都市第五人民医院行TLTG的胃癌患者98例,根据食管空肠吻合方式分为Overlap吻合组(n=56)和π吻合组(n=42)。比较两组围手术期指标(手术时间、吻合时间、术中出血量、淋巴结清扫数目、术后肛门排气时间、术后拔除引流管时间、术后住院时间、肿瘤上缘至食管切缘距离),吻合口相关并发症(吻合口出血、吻合口狭窄、吻合口漏)与随访并发症(吻合口溃疡、倾倒综合征、反流性食管炎、营养不良)发生情况,以及术前与术后3个月整体营养状况主观评估量表(PG-SGA)评分与营养状况客观指标(血红蛋白、白蛋白、总蛋白)水平的变化。结果:Overlap吻合组手术时间[(230.36±25.12)min vs(205.58±20.43)min]、吻合时间[(43.22±6.15)min vs(27.45±5.36)min]均长于π吻合组(P<0.05);两组吻合口相关并发症、随访并发症发生率及术前、术后3个月PG-SGA量表评分与营养状况客观指标水平的变化差异均无统计学意义(P>0.05)。结论:Overlap吻合和π吻合在TLTG术中各有优势,π吻合可缩短手术时间和吻合时间。

Numerical Analysis of Local Joint Flexibility of K-joints with External Plates Under Axial Loads in Offshore Tubular Structures

The Local Joint Flexibility(_(LJF))of steel K-joints reinforced with external plates under axial loads is investigated in this paper.For this aim,firstly,a finite element(FE)model was produced and verified with the results of several experimental tests.In the next step,a set of 150 FE models was generated to assess the effect of the brace angle(θ),the stiffener plate size(ηandλ),and the joint geometry(γ,τ,ξ,andβ)on the_(LJF)factor(f_(LJF)).The results showed that using the external plates can decrease 81%of the f_(LJF).Moreover,the reinforcing effect of the reinforcing plate on the f_(LJF)is more remarkable in the joints with smallerβ.Also,the effect of theγon the f_(LJF)ratio can be ignored.Despite the important effect of the f_(LJF)on the behavior of tubular joints,there is not available any study or equation on the f_(LJF)in any reinforced K-joints under axial load.Consequently,using the present FE results,a design parametric equation is proposed.The equation can reasonably predict the f_(LJF)in the reinforced K-joints under axial load.

右半结肠癌根治术中全腹腔镜下Overlap吻合的短期疗效及并发症分析

目的:通过对比全腹腔镜下顺蠕动侧侧吻合(Overlap吻合)与腹腔外吻合相关临床资料及短期疗效,探究腹腔内吻合在右半结肠癌根治术中的临床疗效及价值。方法:回顾性选择2021年01月至2023年12月我院胃肠与疝外科收治的腹腔镜右半结肠癌根治术患者临床资料,共计92例纳入临床研究。其中采用腹腔内Overlap吻合的患者为ICA组;采用腹腔外端侧吻合为ECA组。收集并分析两组患者临床资料,讨论全腹腔镜下Overlap吻合安全性及短期临床疗效差异。结果:纳入患者一般资料差异无统计学意义(P值>0.05)。手术资料方面,ICA组手术时间[(185.83±27.55)min;P=0.026]与吻合时间[(33.86±4.05)min;P<0.001]均显著长于ECA组,切口长度方面[(4.86±0.84)cm;P<0.001]ICA组显著短于ECA组。而术中出血、清扫淋巴结总数两组差异无统计学意义。术后康复方面,ICA组首次排气时间[(2.55±0.55)天;P=0.001]、首次进流质时间[(3.38±0.62)天;P<0.001]、下床时间[(2.71±0.55)天;P=0.006]、术后住院时间[(7.67±1.26)天;P=0.019]均优于ECA组,且ICA组术后引流量[(277.74±147.68)mL;P=0.017]显著少于ECA组。在术后第3天,ICA组疼痛VAS评分(3.19±0.77;P=0.04)低于ECA组。术后炎症指标方面,两组术后C反应蛋白、中性粒细胞-淋巴细胞比值(NLR)均无统计学差异(P值>0.05)。在手术后并发症方面,总并发症发生率、吻合口瘘、腹腔感染、腹腔出血、吻合口出血、切口感染、肺部感染、术后肠梗阻、术后胃瘫两组并无统计学差异(P值>0.05)。结论:全腹腔镜下Overlap吻合安全可行,具有术后肠道功能恢复更快、创伤更小等优势,手术疗效与传统腔镜辅助手术效果相当,且不会增加短期并发症发生率。

空肠后离断Overlap吻合法在腹腔镜根治性全胃切除术中的应用

目的探讨空肠后离断Overlap吻合法相比传统Overlap吻合法在腹腔镜根治性全胃切除术中的优势及安全性。方法回顾分析2018年3月至2023年6月在昆山市第一人民医院行腹腔镜根治性全胃切除术的胃癌病人资料共43例,根据食管空肠吻合方式的不同进行分组。研究组25例,采用空肠后离断Overlap吻合法进行食管空肠重建;对照组18例,采用传统Overlap吻合法。比较两组病人在围手术期及术后近期指标等方面有无差异。结果两组病人的一般资料比较,差异均无统计学意义(均P>0.05)。两组病人均顺利完成手术,无中转开腹病例。在饮食随访中,研究组病人术后1个月均已恢复半流质饮食或普食,术后3个月均能进食普食。两组病人的术中出血量、术后住院时间以及吻合口漏、吻合口狭窄、吻合口出血等吻合口并发症的发生率相比较,差异均无统计学意义(均P>0.05)。同对照组相比较,研究组的食管空肠吻合时间[(25.4±4.3)min比(39.8±4.5)min,t=–10.549,P<0.001]和手术时间[237 min(230~250 min)比258.6 min(250~285 min),Z=–5.517,P<0.001]均缩短,差异具有统计学意义(均P<0.001)。结论在腹腔镜根治性全胃切除的病人中,改良后的空肠后离断Overlap吻合较传统Overlap吻合更加简便,是一种较好的、安全可行的吻合方式。

Overlapping approach Proton Pump Inhibitors/Nux vomica-Heel as new intervention for gastro-esophageal reflux management:Delphi consensus study

BACKGROUND Gastro-esophageal reflux disease(GERD)may affect the upper digestive tract;up to 20%of population in Western nations are affected by GERD.Antacids,histamine H2-receptor antagonists,and Proton Pump Inhibitors(PPIs)are considered the referring medications for GERD.Nevertheless,PPIs must be managed carefully because their use,especially chronic,could be linked with some adverse effects.An effective and safe alternative pharmacological tool for GERD is needed.After the identification of potentially new medications to flank PPIs,it is mandatory to revise and improve good clinical practices even through a consensus process.AIM To optimize diagnosis and treatment guidelines for GERD through a consensus based on Delphi method.METHODS The availability of clinical studies describing the action of the multicomponent/multitarget medication Nux vomica-Heel,subject of the consensus,is the basic prerequisite for the consensus itself.A modified Delphi process was used to reach a consensus among a panel of Italian GERD specialists on the overlapping approach PPIs/Nux vomica-Heel as a new intervention model for the management of GERD.The Voting Consensus group was composed of 49 Italian Medical Doctors with different specializations:Gastroenterology,otolaryngology,geriatrics,and general medicine.A scientific committee analyzed the literature,determined areas that required investigation(in agreement with the multiple-choice questionnaire results),and identified two topics of interest:(1)GERD disease;and(2)GERD treatment.Statements for each of these topics were then formulated and validated.The Delphi process involved two rounds of questioning submitted to the panel experts using an online platform.RESULTS According to their routinary GERD practice and current clinical evidence,the panel members provided feedback to each questionnaire statement.The experts evaluated 15 statements and reached consensus on all 15.The statements regarding the GERD disease showed high levels of agreement,with consensus ranging from 70%to 92%.The statements regarding the GERD treatment also showed very high levels of agreement,with consensus ranging from 90%to 100%.This Delphi process was able to reach consensus among physicians in relevant aspects of GERD management,such as the adoption of a new approach to treat patients with GERD based on the overlapping between PPIs and Nux vomica-Heel.The consensus was unanimous among the physicians with different specializations,underlying the uniqueness of the agreement reached to identify in the overlapping approach between PPIs and Nux vomica-Heel a new intervention model for GERD management.The results support that an effective approach to deprescribe PPIs through a progressive decalage timetable(reducing PPIs administration to as-needed use),should be considered.CONCLUSION Nux vomica-Heel appears to be a valid opportunity for GERD treatment to favor the deprescription of PPIs and to maintain low disease activity together with the symptomatology remission.

Large-Scale Multi-Objective Optimization Algorithm Based on Weighted Overlapping Grouping of Decision Variables

The large-scale multi-objective optimization algorithm(LSMOA),based on the grouping of decision variables,is an advanced method for handling high-dimensional decision variables.However,in practical problems,the interaction among decision variables is intricate,leading to large group sizes and suboptimal optimization effects;hence a large-scale multi-objective optimization algorithm based on weighted overlapping grouping of decision variables(MOEAWOD)is proposed in this paper.Initially,the decision variables are perturbed and categorized into convergence and diversity variables;subsequently,the convergence variables are subdivided into groups based on the interactions among different decision variables.If the size of a group surpasses the set threshold,that group undergoes a process of weighting and overlapping grouping.Specifically,the interaction strength is evaluated based on the interaction frequency and number of objectives among various decision variables.The decision variable with the highest interaction in the group is identified and disregarded,and the remaining variables are then reclassified into subgroups.Finally,the decision variable with the strongest interaction is added to each subgroup.MOEAWOD minimizes the interactivity between different groups and maximizes the interactivity of decision variables within groups,which contributed to the optimized direction of convergence and diversity exploration with different groups.MOEAWOD was subjected to testing on 18 benchmark large-scale optimization problems,and the experimental results demonstrate the effectiveness of our methods.Compared with the other algorithms,our method is still at an advantage.

Overlapping infections of Mycobacterium canariasense and Nocardia farcinica in an immunocompetent patient:A case report

BACKGROUND Infections by non-tuberculous mycobacteria(NTM)have become more common in recent years.Mycobacterium canariasense(M.canariasense)was first reported as an opportunistic pathogen in 2004,but there have been very few case reports since then.Nocardia is a genus of aerobic and Gram-positive bacilli,and these species are also opportunistic pathogens and in the Mycobacteriales order.Conventional methods for diagnosis of NTM are inefficient.Metagenomic next-generation sequencing(mNGS)can rapidly detect many pathogenic microorganisms,even rare species.Most NTM and Nocardia infections occur in immunocompromised patients with atypical clinical symptoms.There are no previous reports of infection by M.canariasense and Nocardia farcinica(N.farcinica),especially in immunocompetent patients.This case report describes an immunocompetent 52-year-old woman who had overlapping infections of M.canariasense,N.farcinica,and Candida parapsilosis(C.parapsilosis)based on mNGS.CASE SUMMARY A 52-year-old woman presented with a productive cough and chest pain for 2 wk,and recurrent episodes of moderate-grade fever for 1 wk.She received antibiotics for 1 wk at a local hospital,and experienced defervescence,but the productive cough and chest pain persisted.We collected samples of a lung lesion and alveolar lavage fluid for mNGS.The lung tissue was positive for M.canariasense,N.farcinica,and C.parapsilosis,and the alveolar lavage fluid was positive for M.canariasense.The diagnosis was pneumonia,and application of appropriate antibiotic therapy cured the patient.CONCLUSION Etiological diagnosis is critical for patients with infectious diseases.mNGS can identify rare and novel pathogens,and does not require a priori knowledge.

Autoimmune hepatitis-primary biliary cholangitis overlap syndrome complicated by various autoimmune diseases:A case report

BACKGROUND Autoimmune hepatitis(AIH)and primary biliary cholangitis(PBC)are two common clinical autoimmune liver diseases,and some patients have both diseases;this feature is called AIH-PBC overlap syndrome.Autoimmune thyroid disease(AITD)is the most frequently overlapping extrahepatic autoimmune disease.Immunoglobulin(IgG)4-related disease is an autoimmune disease recognized in recent years,characterized by elevated serum IgG4 levels and infiltration of IgG4-positive plasma cells in tissues.CASE SUMMARY A 68-year-old female patient was admitted with a history of right upper quadrant pain,anorexia,and jaundice on physical examination.Laboratory examination revealed elevated liver enzymes,multiple positive autoantibodies associated with liver and thyroid disease,and imaging and biopsy suggestive of pancreatitis,hepatitis,and PBC.A diagnosis was made of a rare and complex overlap syndrome of AIH,PBC,AITD,and IgG4-related disease.Laboratory features improved on treatment with ursodeoxycholic acid,methylprednisolone,and azathioprine.CONCLUSION This case highlights the importance of screening patients with autoimmune diseases for related conditions.

Case study of performance assessment of overlapping shield tunnels with a small curve radius

Due to the network planning of subways and their surrounding structures,increasingly more overlapping shields with a small curve radius have been constructed. A newly constructed upper tunnel partly overlaps a lower one, leading to the extremely complex uplift of the lower tunnel caused by the construction of a new tunnel. Based on the shield-driven project that runs from the Qinghe Xiaoyingqiao Station to the Qinghe Station in Beijing, which adopts the reinforcement measures of interlayer soil grouting and steel supports on site, in this study, the uplift pattern of the lower tunnel and the stress characteristics of steel supports were investigated through numerical simulations and on-site monitoring.The study results show that among all tunnel segments, the first segment of the shield witnesses a maximum uplift displacement that increases with the horizontal space between tunnels. On using either interlayer soil grouting or steel-ring bracing reinforcement, the uplift of the tunnel lining exceeds the control value;by contrast,when these two measures are jointly applied, the uplift of the tunnel lining does not exceed a maximum value of 4.87 mm, which can satisfy the requirements of deformation control. Under these two joint measures, the soil strength between two stacked shield tunnels can be enhanced and the uplift deformation can be restricted with the interlayer soil grouting. Also, the segmental deformation and overall stability of the existing tunnel can be controlled with the temporary steel supports.The deformation of circumferential supports and segments is closely related to each other, and the segmental uplift is controlled by H-shaped steel supports. With the increase in the horizontal space between twin shields, the effect of the construction would gradually weaken, accompanied by a gradual reduction of the stresses of steel supports. These findings provide a valuable reference for the engineering design and safe construction of overlapping shield tunnels with a small curve radius.

Novel method for extraction of ship target with overlaps in SAR image via EM algorithm

The quality of synthetic aperture radar(SAR)image degrades in the case of multiple imaging projection planes(IPPs)and multiple overlapping ship targets,and then the performance of target classification and recognition can be influenced.For addressing this issue,a method for extracting ship targets with overlaps via the expectation maximization(EM)algorithm is pro-posed.First,the scatterers of ship targets are obtained via the target detection technique.Then,the EM algorithm is applied to extract the scatterers of a single ship target with a single IPP.Afterwards,a novel image amplitude estimation approach is pro-posed,with which the radar image of a single target with a sin-gle IPP can be generated.The proposed method can accom-plish IPP selection and targets separation in the image domain,which can improve the image quality and reserve the target information most possibly.Results of simulated and real mea-sured data demonstrate the effectiveness of the proposed method.

Predictors of survival in autoimmune liver disease overlap syndromes

BACKGROUND Survival in patients with autoimmune liver disease overlap syndromes(AILDOS)compared to those with single autoimmune liver disease is unclear.AIM To investigate the survival of patients with AILDOS and assess the accuracy of non-invasive serum models for predicting liver-related death.METHODS Patients with AILDOS were defined as either autoimmune hepatitis and primary biliary cholangitis overlap(AIH-PBC)or autoimmune hepatitis and primary sclerosing cholangitis overlap(AIH-PSC)and were identified from three tertiary centres for this cohort study.Liver-related death or transplantation(liver-related mortality)was determined using a population-based data linkage system.Prognostic scores for liver-related death were compared for accuracy[including liver outcome score(LOS),Hepascore,Mayo Score,model for end-stage liver disease(MELD)score and MELD incorporated with serum sodium(MELD-Na)score].RESULTS Twenty-two AILDOS patients were followed for a median of 3.1 years(range,0.35-7.7).Fourteen were female,the median age was 46.7 years(range,17.8 to 82.1)and median Hepascore was 1(range,0.07-1).At five years post enrolment,57%of patients remained free from liver-related mortality(74%AIH-PBC,27%AIH-PSC).There was no significant difference in survival between AIH-PBC and AIH-PSC.LOS was a significant predictor of liver-related mortality(P<0.05)in patients with AIH-PBC(n=14)but not AIH-PSC(n=8).A LOS cut-point of 6 discriminated liver-related mortality in AIH-PBC patients(P=0.012,log-rank test,100%sensitivity,77.8%specificity)(Harrell's C-statistic 0.867).The MELD score,MELD-Na score and Mayo Score were not predictive of liver-related mortality in any group.CONCLUSION Survival in the rare,AILDOS is unclear.The current study supports the LOS as a predictor of liver-related mortality in AIH-PBC patients.Further trials investigating predictors of survival in AILDOS are required.

The Practical Path of Labor Curriculum in Compulsory Education in China from the Perspective of Overlapping Influence Domain Theory

Since the new curriculum reform,labor education has gradually shed its marginalized position in the“five educations,”and the labor curriculum has become an independent course officially separated from comprehensive practical activity courses.Exploring the practical path of labor curriculum in compulsory education in China has become the primary task of labor education in China.Based on the practical situation of labor curriculum in compulsory education in China,drawing on the theory of overlapping influence domains,and from the perspective of collaborative education among family,school,and community,this paper proposes a curriculum practical path of“school-led”family-school-community collaboration and a curriculum practical path guided by“student-centered”sentiment,in order to provide references for the practice of labor curriculum in compulsory education in China.

High Order Total Variational Denoising Algorithm Based on l_(0) Overlapping Combination Sparse

For addressing impulse noise in images, this paper proposes a denoising algorithm for non-convex impulse noise images based on the l_(0) norm fidelity term. Since the total variation of the l_(0) norm has a better denoising effect on the pulse noise, it is chosen as the model fidelity term, and the overlapping group sparse term combined with non-convex higher term is used as the regularization term of the model to protect the image edge texture and suppress the staircase effect. At the same time, the alternating direction method of multipliers, the majorization–minimization method and the mathematical program with equilibrium constraints were used to solve the model. Experimental results show that the proposed model can effectively suppress the staircase effect in smooth regions, protect the image edge details, and perform better in terms of the peak signal-to-noise ratio and the structural similarity index measure.

Overlap吻合术式在腹腔镜结直肠手术重建中的临床研究

目的研究腹腔镜结直肠手术重建中运用侧侧吻合(Overlap)术式的临床价值。方法选择2022年1月至2023年2月期间龙游县人民医院收治的102例结直肠癌患者为研究对象,均行腹腔镜结直肠癌根治术,以吻合术式不同将其分为两组,其中行功能性端端吻合为对照组(n=51),采用Overlap吻合术式则为观察组(n=51),比较两组患者的围术期指标、炎症指标以及术后并发症发生情况,术后随访12个月,评价两组患者生活质量。结果观察组患者的术后住院、进食、手术以及排气时间均短于对照组,差异均有统计学意义(t分别=5.26、3.49、3.43、3.55,P均<0.05);观察组术后3 d的C反应蛋白(CRP)、白细胞介素-6(IL-6)以及肿瘤坏死因子-α(TNF-α)水平均低于对照组,差异均有统计学意义(t分别=13.14、15.79、12.49,P均<0.05);观察组患者的并发症发生率明显低于对照组,差异有统计学意义(χ^(2)=15.86,P<0.05);两组3、6、9、12个月的生活质量评分比较,差异均无统计学意义(t分别=0.19、0.50、0.60、0.62,P均>0.05)。结论在腹腔镜结直肠癌根治术中,通过采用Overlap吻合术式,不仅可以缩短手术时间,恢复胃肠道功能,还可以减少术后并发症,并且对患者生活质量无明显影响,可以作为有效且安全的一种吻合方式。

中国人工智能伦理治理实践与挑战——基于三期交叠视角

当前,中国人工智能伦理治理处于技术快速发展期、经济社会高质量发展期、国际秩序深度调整期“三期交叠”的特殊时期。技术不确定性、经济社会发展多目标属性以及大国博弈相互交织,给人工智能伦理治理带来新的挑战。在梳理中国人工智能伦理治理实践的基础上,本文提出,“三期交叠”给中国人工智能伦理治理带来的挑战突出表现为影响识别难题、人工智能伦理治理“无人区”难题和伦理治理体系有效性难题三个方面。就此,本文从法律法规体系建设、伦理审查机制建设、伦理教育、治理工具创新和国际合作等方面提出政策建议。

Pseudo-Semi-Overlap Functions-Based Fuzzy Rough Sets Applied to Image Edge Extraction

As an extension of overlap functions, pseudo-semi-overlap functions are a crucial class of aggregation functions. Therefore, (I, PSO)-fuzzy rough sets are introduced, utilizing pseudo-semi-overlap functions, and further extended for applications in image edge extraction. Firstly, a new clustering function, the pseudo-semi-overlap function, is introduced by eliminating the symmetry and right continuity present in the overlap function. The relaxed nature of this function enhances its applicability in image edge extraction. Secondly, the definitions of (I, PSO)-fuzzy rough sets are provided, using (I, PSO)-fuzzy rough sets, a pair of new fuzzy mathematical morphological operators (IPSOFMM operators) is proposed. Finally, by combining the fuzzy C-means algorithm and IPSOFMM operators, a novel image edge extraction algorithm (FCM-IPSO algorithm) is proposed and implemented. Compared to existing algorithms, the FCM-IPSO algorithm exhibits more image edges and a 73.81% decrease in the noise introduction rate. The outstanding performance of (I, PSO)-fuzzy rough sets in image edge extraction demonstrates their practical application value.

面向类不平衡和重叠的工控数据异常检测的半监督欠采样方法

工业控制系统异常检测面临着数据缺乏标签信息、类不平衡和类重叠的耦合问题,导致现有的分类器难以精准检测异常数据。现有的数据级采样方法在打伪标签、数据平衡或检测重叠区域时存在着打伪标签结果不准确、采样效果稳定性差以及重叠识别率低等问题。为此,提出一种基于半监督学习的欠采样方法(SSLU-LP)。该方法通过异构集成将标签传播机制和单类分类器结合,补充数据伪标签;利用最小生成树策略构建重叠区域检测模型;采用欠采样策略,通过最近邻搜索有选择性地去除部分多数类样本。最后该方法与四种经典分类器结合,在九个工控数据集上与九种混合算法进行比较。实验结果表明,所提方法可以精准地为无标签数据打伪标签,高效且有效检测出不平衡数据集中的重叠数据,改善了分类器的训练效果,提高了分类器的异常检测性能。

基于重叠网格技术柔性旗帜与流体耦合运动数值模拟

为研究分析自然界与风能采集领域中柔性旗帜与空气流固耦合运动特性,基于空气动力学原理和二维柔性板轴向不可拉伸假设推导旗帜颤振非线性理论模型,研究了旗帜与空气之间的耦合运动,分析长度、质量比和风速对其运动特性影响。利用双向流固耦合方法及重叠网格技术对旗帜随风摆动过程进行数值模拟,得出流场中旗帜运动行为及周围流场特性。结果表明:临界颤振风速随旗长增加而减小,摆动位移随风速增加先增大后减小;质量比越大,颤振频率越小,斯特劳哈尔数受其影响较小;旗帜尺寸一定时,风速较小,摆动位移、频率较小,风速超过临界颤振风速发生大幅度颤振现象;旗帜周围漩涡会经历产生、脱落和消失过程,周围压力及速度会随漩涡运动过程发生变化。可见采用基于重叠网格技术的数值模拟方法可有效解决柔性旗帜大变形问题,实现理论与数值仿真验证分析。

面向法律领域的实体和关系抽取

中文司法领域的实体和关系抽取技术在提高办案效率方面具有重要作用,但现有的关系抽取模型缺乏领域知识且难以处理重叠实体,造成难以准确区分和提取实体与关系等问题.通过引入领域知识,提出一种法律信息增强模块,增强了用所提法律潜在关系与全局对应(legal potential relationship and global correspondence,LPRGC)模型理解法律文本中术语、规则和上下文信息的能力,从而提高了实体和关系的识别准确性,进而提升了实体和关系抽取算法的性能.为解决重叠实体问题,设计了一种基于潜在关系和实体对齐的关系抽取方法.通过精确标注实体位置,筛选潜在关系,并利用全局矩阵对齐实体,解决重叠实体的关系抽取问题,能够更准确地捕捉到重叠实体之间的关系,并有效地将其映射到正确的实体对上,从而提高抽取结果的准确性.在中国法律智能技术评测数据集上进行实体和关系抽取实验,结果表明,LPRGC模型的准确率、召回率和F_(1)值分别为85.21%、81.19%和83.15%,均优于对比模型,特别是在处理实体重叠问题时,LPRGC模型在单实体重叠类型的抽取中,F_(1)值达到了81.45%;在多实体重叠类型的抽取中,F_(1)值达80.67%.LPRGC模型在实体和关系抽取的准确性上较现有方法有明显改进,在处理复杂法律文本中的实体重叠问题上取得了显著效果.