检索结果-南通市图书馆

A subgraph matching algorithm based on subgraph index for knowledge graph

在线全文

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2022年第3期16卷 123-140页

作者： Yunhao sun guanyu LI Jingjing DU Bo NING Heng CHEN Faculty of Information Science and Technology Dalian Maritime UniversityLiaoning 116026China Faculty of Software Dalian University of Foreign LanguagesLiaoning 116044China

The problem of subgraph matching is one fundamental issue in graph search,which is NP-Complete ***,subgraph matching has become a popular research topic in the field of knowledge graph analysis,which has a wide range of applications including question answering and semantic *** this paper,we study the problem of subgraph matching on knowledge ***,given a query graph q and a data graph G,the problem of subgraph matching is to conduct all possible subgraph isomorphic mappings of q on *** graph is formed as a directed labeled multi-graph having multiple edges between a pair of vertices and it has more dense semantic and structural features than general *** accelerate subgraph matching on knowledge graph,we propose a novel subgraph matching algorithm based on subgraph index for knowledge graph,called as *** subgraph matching algorithm consists of two key *** design is a subgraph index of matching-driven flow graph(FGqT),which reduces redundant calculations in *** design is a multi-label weight matrix,which evaluates a near-optimal matching tree for minimizing the intermediate *** the aid of these two key designs,all subgraph isomorphic mappings are quickly conducted only by traversing *** empirical studies on real and synthetic graphs demonstrate that our techniques outperform the state-of-the-art algorithms.

关键词： knowledge graph subgraph matching subgraph index matching tree

胃癌调强放疗后胰腺亚临床功能损伤评估与保护

在线全文

学校读者我要写书评

暂无评论

中华放射肿瘤学杂志 2022年第2期31卷 153-159页

作者：孙冠宇马一夫马佳艳郭秋辰周成良陈黎杨咏强钱建军张力元田野苏州大学附属第二医院放疗科苏州大学放射肿瘤治疗学研究所苏州市肿瘤放射治疗学重点实验室苏州215004

目的通过相关生化指标和胰腺体积改变来评估胃癌调强放疗(IMRT)后胰腺亚临床功能损伤,并探讨通过剂量学预测以及剂量限制来降低胰腺剂量。方法回顾性选择接受45 Gy术后辅助放化疗且无胰腺基础疾病的胃癌患者30例,勾画胰腺并评估剂量及... 详细信息

目的通过相关生化指标和胰腺体积改变来评估胃癌调强放疗(IMRT)后胰腺亚临床功能损伤,并探讨通过剂量学预测以及剂量限制来降低胰腺剂量。方法回顾性选择接受45 Gy术后辅助放化疗且无胰腺基础疾病的胃癌患者30例,勾画胰腺并评估剂量及与计划靶体积(PTV)解剖位置关系。分析放疗前后患者空腹血糖、血清脂肪酶和血清淀粉酶以及胰腺体积值变化。应用Pearson分析上述生化指标和体积值变化与胰腺剂量相关性,应用受试者工作特征(ROC)曲线分析相关剂量学预测阈值。探讨IMRT中剂量限制可行性。结果30例患者胰腺体积为37.6 cm^(3),其中89%包在PTV内。胰腺D_(mean)为45.92 Gy,其中胰头、胰体、胰尾D_(mean)分别为46.45、46.46、45.80 Gy。患者空腹血糖值变化不明显。放疗后6、12个月血清脂肪酶分别较放疗前下降66%、77%(P<0.001),血清淀粉酶分别下降24%、38%(P<0.001)。22例胰腺体积在放疗后18个月内下降了47%。ROC曲线分析得出胰腺V_(45Gy)对放疗后6个月脂肪酶、淀粉酶以及12个月淀粉酶下降1/3具有最佳预测价值,切点值为V_(45Gy)<85%;胰腺D_(mean)对放疗后12个月血清脂肪酶下降2/3具有最佳预测价值,切点值为D_(mean)<45.01 Gy。按"整个胰腺"和"PTV外胰腺"限量后胰腺V_(45Gy)分别下降11%和7%、胰腺D_(mean)分别下降2%和2%、胰尾D_(mean)各下降3%。结论血清脂肪酶和血清淀粉酶在胃癌术后辅助放疗后6、12个月出现明显下降,胰腺体积在放疗后18个月内出现了明显缩小。胰腺V_(45Gy)<85%和D_(mean)<45.01 Gy是血清脂肪酶和淀粉酶下降的剂量预测值,相应剂量学限制可以一定程度降低其剂量。

关键词：胰腺剂量体积亚临床功能损伤胃肿瘤/调强放射疗法

在线全文

学校读者我要写书评

暂无评论

储热用相变材料特性研究概述

科技创新与应用 2024年第3期14卷 21-24页

作者：夏军宝李毅孙冠宇郝承明喻巧赖建永中国核动力研究设计院核反应堆系统设计技术重点实验室成都610213

使用合适的储热材料可以提高热功转换的效率,实现热量的高效利用。由于相变材料可以利用潜热储热,储热密度相对较大,因此利用相变材料储热成为研究热点。该文对近年来储热用相变材料的特性研究进行概述,主要是有机和无机相变材料的改性... 详细信息

使用合适的储热材料可以提高热功转换的效率,实现热量的高效利用。由于相变材料可以利用潜热储热,储热密度相对较大,因此利用相变材料储热成为研究热点。该文对近年来储热用相变材料的特性研究进行概述,主要是有机和无机相变材料的改性进行对比研究,确定改性方法,并进一步梳理目前国内外针对储热材料的研究方向及储热项目,总结得出现有大型储热项目主要还是采用显热蓄热材料,相变储热材料的推广应用尚待进一步开发。

关键词：储热改性有机相变材料无机相变材料特性研究

Control Flow Obfuscation Based Protection Method for Android Applications

在线全文

学校读者我要写书评

暂无评论

China Communications 2017年第11期14卷 247-259页

作者： Yong Peng guanyu Su Bin Tian Maohua sun Qi Li Beijing University of Posts and Telecommunications No 10 Xitucheng Road Haidian District Beijing 100876 China Beijing KeyLaboratory of Space-ground Interconnection and Convergence No 10 Xitucheng Road Haidian District Beijing 100876 China China Information Technology Security Evaluation Center No 1 Building No 8 Shangdixi Road Haidian District Beijing 100085 China Information School Capital University of Economics and Business No 121 Zhangjia Road Fengtai District Beijing 100070 China

With the popularization and rapid development of mobile intelligent terminals(MITs), the number of mobile applications, or apps, has increased exponentially. It is increasingly common for malicious code to be inserted into counterfeit apps, which can cause significant economic damage and threaten the security of users. Code obfuscation techniques are a highly efficient group of methods for code security protection. In this paper, we propose a novel control flow obfuscation based method for Android code protection. First, algorithms to insert irrelevant code and flatten the control flow are employed that minimize the cost of obfuscation while ensuring its strength. Second, we improve the traditional methods of control flow flattening to further reduce the costs of obfuscation. Lastly, the use of opaque predicates is strengthened by establishing an access control strategy, which converts the identification of opaque predicates in the entire program into a graph traversal problem, and thereby increases the strength of the code protection. We did some experiments to evaluate our method, and the results show that the proposed method can work well.

关键词： control flow obfuscation control flow obfuscation software security

Atomically precise alkynyl-protected Ag_(20)Cu_(12)nanocluster:Structure analysis and electrocatalytic performance toward nitrate reduction for NH_(3)synthesis

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第8期16卷 10867-10872页

作者： guanyu Ma Fang sun Liang Qiao Quanli Shen Lei Wang Qing Tang Zhenghua Tang New Energy Research Institute School of Environment and EnergySouth China University of TechnologyGuangzhou Higher Education Mega CentreGuangzhou 510006China School of Chemistry and Chemical Engineering Chongqing Key Laboratory of Theoretical and Computational ChemistryChongqing UniversityChongqing 401331China China Petrochemical Research Institute PetroChina Company LimitedBeijing 102206China

Electrochemical nitrate reduction reaction(NtrRR)has been emerging as an appealing route for both water treatment and NH_(3)***,we report the structure analysis and electrocatalytic performance of a novel homoleptic alkynyl-protected Ag_(20)Cu_(12)nanocluster(Ag_(20)Cu_(12)in short)with atomic precision,which has eight free electrons and displays characteristic absorbance *** crystal X-ray diffraction(SC-XRD)discloses that,it adopts a Ag_(14)kernel capped by three Ag_(2)Cu_(4)(C≡CArF)_(8)metal–ligand binding motifs in the outer ***_(20)Cu_(12)exhibited excellent catalytic performance toward NtrRR,as manifested by the superior NH_(3)Faradaic efficiency(FE,84.6%)and yield rate(0.138 mmol·h^(−1)·mg−1)than the homoleptic alkynyl-protected Ag_(32)***,it demonstrates good catalytic recycling *** functional theory(DFT)calculations revealed that,the de-ligated Ag_(20)Cu_(12)cluster can expose the available AgCu bimetallic sites as the efficient active sites for NH_(3)*** particular,the participation of Cu sites greatly facilitates the initial capture of NO_(3)−and simultaneously promotes the selectivity of the final *** study discovers a novel homoleptic alkynyl-protected AgCu superatom,and offers a great example to elucidate the structure–performance relationship of bimetallic catalyst for NtrRR and other multiple protons/electrons coupled electrocatalytic reactions.

关键词： Ag_(20)Cu_(12)nanocluster alkynyl ligand nitrate reduction reaction(NtrRR) ammonia synthesis density functional theory(DFT)calculations

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

足部皮肤缺损的修复(附64例分析)

上海第一医学院学报 1982年第5期 373-376页

作者：林增禄孙以鲁黎冠瑜许赛英上海第一医学院中山医院整形外科

足部创伤后常由于局部疤痕、溃疡或深部组织纤维愈着而影响到足的功能恢复。本文总结我院近十年来对64例(74个足)皮肤缺损的修复方法和随访结果,83.0％达到了预期的功能和形态效果。我们的治疗原则是根据缺损部位、大小、功能状态、损... 详细信息

足部创伤后常由于局部疤痕、溃疡或深部组织纤维愈着而影响到足的功能恢复。本文总结我院近十年来对64例(74个足)皮肤缺损的修复方法和随访结果,83.0％达到了预期的功能和形态效果。我们的治疗原则是根据缺损部位、大小、功能状态、损伤深度及重要组织的修复需要来选择不同的修复方法。分析各种方法在足部皮肤缺损修复中的优缺点和适应症。强调了局部皮瓣和足部血管神经蒂皮瓣在足底较小面积着力部位的缺损的修复和游离背阔肌肌皮瓣移植在一期修复足底急性创伤巨大创面中有着重要意义。53例随访结果(5月～10年),主要并发症为局部浅表溃疡、胼胝形成和疤痕粘连。其主要原因并非手术方法问题而是处理欠妥当所致。

关键词：足部皮肤足底血管神经皮肤缺损修复方法血管蒂蒂皮瓣局部皮瓣足背皮瓣功能恢复皮瓣修复

Embolization of blood-supply artery followed by surgery for treatment of mesorectal Castleman’s disease:case report and literature review

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Gastroenterology Report 2019年第2期7卷 141-145,I0002页

作者： guanyu Yu Fuao Cao Haifeng Gong Peng Liu Ge sun Wei Zhang Department of Colorectal Surgery Changhai HospitalShanghaiChina

A 23-year-old male patient was diagnosed as having a hypervascular pelvic mass by ultrasonography and magnetic resonance examination.A pathology puncture showed vitreous vascular Castleman’s *** of concerns about tumor blood supply,embolization under digital subtraction angiography(DSA)was performed on the artery of the pelvic tumor before resection of the mass and surrounding ***’s disease of pelvic lymph node(mixed type,mainly hyaline vascular type)was confirmed pathologically from postoperative *** of the blood-supply artery of a hypervascular mass should be considered before surgery is performed.

关键词： Castleman’s disease mesorectal tumor embolization

Group relational privacy protection on time-constrained point of interests

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2023年第3期17卷 239-241页

作者： Bo NING Xiaonan LI Fan YANG Yunhao sun guanyu LI George Y.YUAN Faculty of Information Science and Technology Dalian Maritime UniversityDalian 116026China Faculty of Software Dalian University of Foreign LanguagesDalian 116044China Thinvent Digital Technology Co. Ltd.Nanchang 330029China

1 Introduction With the rapid development of mobile networks,locationbased services has become popular in the daily lives of *** service providers can recommend the profitable services to persons through mining the frequent interests or places of ***,one aspect is that the historical data on Internet can easily cause the leakage of user-relationship privacy,another aspect is that the historical interests of person are always bound to ***,this paper devotes to study a privacy protection method on time-constrained point of interests(PoIs)based on the group relationships of users.

关键词： services relational constrained

油田区域地热+多能互补能源系统技术应用分析

在线全文

学校读者我要写书评

暂无评论

综合智慧能源 2023年第12期45卷 63-70页

作者：孙冠宇王永真颜艺灿王宇飞张平张兰兰中国石油冀东油田分公司河北唐山063004 北京理工大学机械与车辆学院北京100081

地热能作为一种可再生清洁能源,在实现绿色可持续供热方面具有广泛的应用前景。基于冀东油田采油区热电需求,构建地热+多能互补能源系统供能模式,并采用TRNSYS软件搭建了动态模型,对典型日和全年运行工况进行模拟分析。结果表明,非采暖... 详细信息

地热能作为一种可再生清洁能源,在实现绿色可持续供热方面具有广泛的应用前景。基于冀东油田采油区热电需求,构建地热+多能互补能源系统供能模式,并采用TRNSYS软件搭建了动态模型,对典型日和全年运行工况进行模拟分析。结果表明,非采暖季和采暖季典型日内光伏组件累计发电量分别为1726.0和1301.0 kW·h,电网累计下网电量分别为4636.6和5355.9kW·h,全年光伏组件累计发电量和电网下电量分别为475.8和1856.7MW·h。系统增加水源热泵后,全年余热水热量利用率提高47.7%。地热水温度提高和源测流量增加可在一定程度上提升热泵性能系数,而单独增加荷侧流量后,性能系数不变,热泵出口水温降低。另外,通过采用光伏发电系统,全年可以减少二氧化碳排放达271.3 t,且从热电供应角度来看,系统清洁能源占比达92.3%,表明该系统具有优良的环保效益。

关键词：油田区域地热水利用光伏发电 TRNSYS模型环保效益多能互补热泵可再生能源