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DCaT:面向高分辨率场景的轻量级语义分割模型

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计算机工程与应用 2025年第1期61卷 252-262页

作者：黄科迪黄鹤鸣李伟樊永红青海师范大学计算机学院西宁810008 藏语智能信息处理及应用国家重点实验西宁810008

语义分割是计算机视觉中分析和理解场景的关键任务,但现有的分割模型需要较高的计算成本和内存需求,不适合高分辨率场景的轻量级语义分割。针对该问题,提出了一种新的面向高分辨率场景的轻量级语义分割模型DCaT。采用深度可分离卷积提... 详细信息

语义分割是计算机视觉中分析和理解场景的关键任务,但现有的分割模型需要较高的计算成本和内存需求,不适合高分辨率场景的轻量级语义分割。针对该问题,提出了一种新的面向高分辨率场景的轻量级语义分割模型DCaT。采用深度可分离卷积提取图像的局部语义;使用基于坐标感知和动态稀疏混合注意力的轻量级Transformer获取图像的全局语义;通过模块融合,在低级语义上注入高级语义;通过分割头输出像素预测标签。实验结果表明:与基线模型相比,DCaT在高分辨率数据集Cityscapes上的平均交并比提高了1.5个百分点,模型复杂度降低了26%,推理速度提升了12%。实现了高分辨率场景下模型复杂度与性能之间的更好平衡,证明了DCaT的有效性和实用性。

关键词：语义分割轻量化高分辨率 Transformer 稀疏注意力

单原子Pt负载在锐钛矿(001)表面的电光学特性研究

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原子与分子物理学报 2025年第6期42卷 43-50页

作者：靳帆赵志超运城学院应用化学系运城044000 运城学院科研产业部运城044000

基于第一性原理的多体格林函数理论方法,系统探究了锐钛矿TiO_(2)(001)表面负载Pt单原子催化剂的电子结构和光学性质,考虑Pt在完美表面和缺陷表面(O空位)两种基底上的负载.结果发现,Pt会在TiO_(2)禁带中间、价带和导带边缘引入新能级,... 详细信息

基于第一性原理的多体格林函数理论方法,系统探究了锐钛矿TiO_(2)(001)表面负载Pt单原子催化剂的电子结构和光学性质,考虑Pt在完美表面和缺陷表面(O空位)两种基底上的负载.结果发现,Pt会在TiO_(2)禁带中间、价带和导带边缘引入新能级,但不同基底负载的Pt单原子催化剂存在不同的带隙特性.Pt的负载会引起体系光学吸收红移,增大光学吸收范围,延伸光吸收至可见光甚至是红外区域,提升可见光活化的可能性,同时改善体系的激子束缚能,有利于空穴与电子有效分离,这可能是Pt负载后光催化性能提升的原因之一.然而,若在可见光或低能量紫外光激发后,分离的电子与空穴没有及时参与反应,体系衰变回最低激发态,此时极大的激子束缚能可能会加速电子与空穴重组,不利于表面催化反应的进行.负载在O空位的催化剂最低激发态的激子束缚能比完美表面小,重组速率慢.计算结果能够为理解单原子催化剂结构-性能关系提供一些见解.

关键词：二氧化钛 Pt单原子催化剂多体格林函数理论电子结构光吸收

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Laboratory Assessment of Lubricants for Wheel/Rail Lubrication

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Journal of Materials Science & Technology 1997年第1期13卷 57-60页

作者： Zhao, XZ Liu, JJ Zhu, BL Wang, cy ZHENGZHOU RES INST MECH ENGN ZHENGZHOU 450052PEOPLES R CHINA

The antiwear properties of two wheel/rail lubricating oils were tested and compared on an Amsler machine. Under same testing conditions, oil A (developed by authors) showed much better wear resistance and higher load-carrying capacity than oil B (imported from abroad). The X-ray diffraction (XRD) analyses of the worn surfaces showed that different extreme pressure (EP) lubricating films were formed on the surfaces when the rollers were lubricated with different oils under boundary lubrication condition. The EP film of oil A was a composite film containing three compounds, FeO, FeSx and FeP, while oil B formed only a simple EP film of FePO4. The composite EP film showed lower shear strength and better antiwear property than the simple EP film, which brought about different wear resistance df the two wheel/rail lubricating oils.

关键词： Lubricating oils

控制方向未知的受限多智能体系统的预设时间模糊控制

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工程科学学报 2025年第1期47卷 121-129页

作者：李菲周超范利蓉王芳燕山大学理学院秦皇岛066004 河北农业大学海洋学院秦皇岛066003

综合考虑受控制方向未知、输入受限和状态时延影响的有领导者多智能体系统的编队控制问题,设计基于模糊逻辑系统的预设时间一致性控制策略.为了保证编队输出误差在预设时间内满足预定的约束范围要求,引入预设时间性能函数,构造Lyapunov-... 详细信息

综合考虑受控制方向未知、输入受限和状态时延影响的有领导者多智能体系统的编队控制问题,设计基于模糊逻辑系统的预设时间一致性控制策略.为了保证编队输出误差在预设时间内满足预定的约束范围要求,引入预设时间性能函数,构造Lyapunov-Krasovskii(L-K)泛函解决状态时延问题,将外界干扰和L-K泛函的导数中的部分项定义为未知非线性函数,并利用模糊逻辑系统对其进行估计,利用Nussbaum函数和均值定理分别处理控制方向未知和输入受限问题,基于以上设计,提出预设时间模糊控制策略,并通过Lyapunov稳定性理论,分析闭环系统的有界稳定性,数值对比仿真和两级化学反应器应用仿真说明控制方法的有效性.

关键词：多智能体系统状态时延输出误差约束输入受限控制方向未知

Outcomes of side-to-side conversion hepaticojejunostomy for biliary anastomotic stricture after right-liver living donor liver transplantation

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Hepatobiliary & Pancreatic Diseases International 2013年第1期12卷 42-46页

作者： Kenneth SH Chok See Ching Chan Tan To Cheung Albert cy Chan William W Sharr Sheung Tat fan Chung Mau Lo Department of Surgery The University of Hong Kong102 Pokfulam RoadHong KongChina State Key Laboratory for Liver Research The University of Hong Kong102 Pokfulam RoadHong KongChina

BACKGROUND:Conversion hepaticojejunostomy is considered the salvage intervention for biliary anastomotic stricture,a common complication of right-liver living donor liver transplantation with duct-to-duct anastomosis,after failed endoscopic *** aim of this study is to compare the outcomes of side-to-side hepaticojejunostomy with those of endto-side ***:Prospectively collected data of 402 adult patients who had undergone right-liver living donor liver transplantation with duct-to-duct anastomosis were *** of biliary anastomotic stricture was made based on clinical,biochemical,histological and radiological *** treatment was the first-line treatment of biliary anastomotic ***:Interventional radiological or endoscopic treatment failed to correct the biliary anastomotic stricture in 13 patients,so they underwent conversion *** of them received end-to-side hepaticojejunostomy and three received side-to-side *** the end-to-side group,two patients sustained hepatic artery injury requiring repeated microvascular anastomosis,two developed restenosis requiring further percutaneous transhepatic biliary drainage and balloon dilatation,and two required revision *** the side-to-side group,one patient developed re-stenosis requiring further endoscopic retrograde cholangiography and balloon *** re-operation was needed in this ***,outcomes in the two groups were similar in terms of liver function and graft ***:Despite the similar outcomes,side-to-side hepaticojejunostomy may be a better option for bile duct reconstruction after failed interventional radiological or endoscopic treatment because it can decrease the chance of hepatic artery injury and allows future endoscopic treatment if re-stricture ***,more large-scale studies are warranted to validate the results.

关键词： right-liver endoscopic treatment living donor liver transplantation biliary anastomotic stricture duct-to-duct anastomosis hepaticojejunostomy

Deep Synchronization Control of Grid-Forming Converters:A Reinforcement Learning Approach

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IEEE/CAA Journal of Automatica Sinica 2025年第1期 273-275页

作者： Zhuorui Wu Meng Zhang Bo fan Yang Shi Xiaohong Guan the School of cyber Science and Engineering Xi'an Jiaotong University the Department of Mechanical Engineering University of Victoria

Dear Editor,This letter proposes a deep synchronization control(DSC) method to synchronize grid-forming converters with power grids. The method involves constructing a novel controller for grid-forming converters based on the stable deep dynamics model. To enhance the performance of the controller, the dynamics model is optimized within the deep reinforcement learning(DRL) framework. Simulation results verify that the proposed method can reduce frequency deviation and improve active power responses.

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Regioselective etherification of 1,2-O-isopropylidene-4,6-di-O-benzyl myo-inositol

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Chinese Journal of Chemistry 1996年第3期14卷 271-278页

作者： Yuan, cy Zhai, HX Li, SS ACAD SINICA SHANGHAI INST ORGAN CHEMSHANGHAI 200032PEOPLES R CHINA

During the etherification of 1,2-O-isopropylidene-4,6-di-O-benzyl myo-inositol, the specific regioselectivity on 3- or 8-hydroxyl group was showed to be determined by the nature of the O-alkylating agents used. As demonstrated by MM and MNDO calculation, the regioselectivity of the reaction mentioned can be rationalized by steric and/or electronic effect.

关键词： regioselective etherification myo-inositol MM and MNDO calculation

使用合规农药能确保农产品“地头”质量安全吗?——基于豇豆农户的扎根理论分析

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海南大学学报（人文社会科学版） 2025年第1期43卷 119-128页

作者：樊孝凤张娇朱月季海南大学国际商学院海南海口570228

新的农产品质量安全法首次将小农户施药行为纳入监管范围,进一步厘清农户施药行为的影响机理与因素,有助于政府精准施策。通过对海南3个村32户农民豇豆种植过程的全程蹲点跟踪,对豇豆施药环节的参与式观察与深度访谈,运用扎根理论分析... 详细信息

新的农产品质量安全法首次将小农户施药行为纳入监管范围,进一步厘清农户施药行为的影响机理与因素,有助于政府精准施策。通过对海南3个村32户农民豇豆种植过程的全程蹲点跟踪,对豇豆施药环节的参与式观察与深度访谈,运用扎根理论分析了访谈资料。研究发现:农户施药环节是一个复杂的行为选择过程,即使施用合规农药也不能确保农产品在产地的质量安全。在合规农药视角下影响农户施药行为选择的最重要因素是信息渠道,其次是农产品质量安全管理的政策强度、农产品市场价格和农村劳动用工成本。同时,邻里效应在农户施药行为选择中的作用越来越弱。在此基础上提出,要增加农户用药信息的有效供给渠道,加强农产品质量安全的全面检测,坚持为农户提供形式多样的有针对性的有效培训,增加重要食用农产品质量安全关键技术供给与推广,加强农产品“优质优价”市场建设的政策建议,并进一步指出海南自贸港建设和RECP协议实施背景下提升海南农产品质量安全水平的紧迫性。

关键词：合规农药施药行为农产品质量安全扎根理论

Genetic polymorphism in pathogenesis of irritable bowel syndrome

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World Journal of Gastroenterology 2014年第47期20卷 17693-17698页

作者： cynthia KY Cheung Justin cy Wu Institute of Digestive Disease The Chinese University of Hong Kong

Irritable bowel syndrome (IBS) is a complex symptom-based disorder without established biomarkers or putative pathophysiology. IBS is a common functional gastrointestinal disorder which is defined as recurrent abdominal pain or discomfort that has at least two of the following symptoms for 3 d per month in the past 3 mo according to ROME III: relief by defecation, onset associated with a change in stool frequency or onset with change in appearance or form of stool. Recent discoveries revealed genetic polymorphisms in specific cytokines and neuropeptides may possibly influence the frequencies and severity of symptoms, as well as the therapeutic responses in treating IBS patients. This review gives new insights on how genetic determinations influence in clinical manifestations, treatment responses and potential biomarkers of IBS.

关键词： Irritable bowel syndrome Genetic polymorphism cytokines Serotonin Psychiatric distress Endocannabinoids