检索结果-南通市图书馆

Simulation of Crowd Motion Based on Boids Flocking Behavior and Social Force Model

在线全文

学校读者我要写书评

暂无评论

Instrumentation 2021年第1期8卷 29-42页

作者： zhang xuguang ZHU Yanna School of Communication Engineering Hangzhou Dianzi UniversityHangzhouChina

In the process of crowd movement,pedestrians are often affected by their *** order to describe the consistency of adjacent individuals and collectivity of a group,this paper learns from the rules of the flocking behavior,such as segregation,alignment and cohesion,and proposes a method for crowd motion simulation based on the Boids model and social force ***,the perception area of individuals is divided into zone of segregation,alignment and ***,the interactive force among individuals is calculated based upon the zone information,velocity vector and the group *** interactive force among individuals is the synthesis of three forces:the repulsion force to avoid collisions,the alignment force to keep consistent with the velocity direction,and the attractive force to get close to the members of *** segregation and alignment areas,the repulsion force and alignment force among pedestrians are limited by visual field ***,the interactive force among individuals,the driving force of destination and the repulsion force of obstacles work together to drive the behavior of crowd *** simulation results show that the proposed method can not only effectively simulate the interactive behavior between adjacent individuals but also the collective behavior of group.

关键词： Collective Behavior Crowd Motion Simulation Social Force Model Boids Model

A Correlation Analysis of Postoperative Hypercoagulability and Peripheral Circulating Tumor Cells in Patients with Lung Cancer

在线全文

学校读者我要写书评

暂无评论

Proceedings of Anticancer Research 2022年第4期6卷 41-46页

作者： xuguang zhang Duo zhang Hefei Li Thoracic Surgery Department Affiliated Hospital of Hebei UniversityBaoding 071000Hebei ProvinceChina

Objective:To explore the correlation between peripheral circulating tumor cells and hypercoagulability in patients with lung cancer after ***:From January 2017 to December 2021,89 patients with lung cancer who were treated in the Affiliated Hospital of Hebei University were selected as the research subjects,and a retrospective analysis was conducted to analyze and observe the D-dimer(DD),fibrinogen(FIB),and platelet(PLT)levels in peripheral blood,as well as detect peripheral ***:There were statistical differences in TMN staging,tumor metastasis,and lymph node metastasis in the clinical data,but there were no statistical differences in gender,smoking history,and pathological *** retrospective analysis and comparison of the patients,the DD(mg/ml),FIB(g/L),and PLT(×10^(9)/L)levels of the CTC positive group were 3.41±0.58,3.98±0.87,and 367.26±34.98,respectively;the CTC negative group’s DD(mg/ml),FIB(g/L),and PLT(×10^(9)/L)levels were 0.89±0.49,1.06±0.45,and 234.69±35.69,respectively,and the differences were statistically *** factors affecting the prognosis of patients included TMN staging and CTC;the number of CTC positives in the death group was significantly higher than that in the survival group,and there was a statistical difference between the ***,age,smoking history,pathological type,and surgical resection had no effect on the prognosis of *** the enrolled patients,the survival rate was 71.91%.Conclusion:CTC-positive patients have a higher probability of hypercoagulability after surgery and are prone to tumor metastasis;thus,CTC can be used as a judgment index for the prognosis of patients.

关键词： Lung cancer Hypercoagulable state Peripheral circulating tumor cells

The Level of Circulating Tumor Cells in Patients with Non-Small Cell Lung Cancer and Its Relationship with Tumor Markers

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Proceedings of Anticancer Research 2022年第4期6卷 47-52页

作者： Rongfang Liu Ben Li xuguang zhang Anesthesiology Department Affiliated Hospital of Hebei UniversityBaoding 071000Hebei ProvinceChina Thoracic Surgery Department Affiliated Hospital of Hebei UniversityBaoding 071000Hebei ProvinceChina

Objective:To explore the level of circulating tumor cells in patients with non-small cell lung cancer and its relationship with tumor ***:Fifty patients with NSCLC admitted to a hospital from March 2019 to February 2022 were retrospectively selected as the research subjects;their clinical data were sorted out and *** patients were examined for *** to their levels,the patients were divided into a positive group(30 cases,≥4%)and a negative group(20 cases,<4%).The positive rate of peripheral CTCs in patients with different gender,age,and pathological types of NSCLC,the positive rate of peripheral CTCs in patients with different staging of NSCLC,and the relationship between serum CEA,CA125,CYFRA21-1,and peripheral CTCs were analyzed and ***:There was no significant difference in gender,age,and pathological type between the positive group and the negative *** was also no significant difference in the T staging,N staging,and M staging between the positive group and the negative ***,there was significant difference in the clinical staging of the positive group and the negative *** CEA,CA125,and CYFRA21-1 of the positive group were 7.45±1.26,38.56±4.12,and 5.01±1.36,respectively,whereas those of the negative group were 5.12±1.22,32.69±4.01,and 3.87±1.25,*** comparison between the two groups was statistically ***:CTCs provide the possibility of detecting cancer before the use of imaging methods,guide treatment in combination with other tumor markers,monitor postoperative treatment,and predict patients’outcome.

关键词： Circulating tumor cells Tumor markers Lung cancer

An Exploration of the Treatment of Spontaneous Progressive Hemopneumothorax in Young People

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Proceedings of Anticancer Research 2022年第5期6卷 20-25页

作者： Duo zhang Qiang Guo xuguang zhang Haibo Wang Thoracic Surgery Department Affiliated Hospital of Hebei UniversityBaoding 071000Hebei ProvinceChina

Objective:To explore an effective treatment for spontaneous progressive hemopneumothorax in young ***:Thirty-four young patients with spontaneous progressive hemopneumothorax from January 2018 to December 2019 were selected to be included in the control group for retrospective analysis;from January 2020 to December 2021,69 young patients with spontaneous progressive hemopneumothorax were selected to be included in the study *** control group was treated with double-port thoracoscopic bullectomy,whereas the study group was treated with single-port thoracoscopic *** intraoperative blood loss,operation time,tube retention time,VAS score,postoperative air leakage,and 1-year recurrence of the patients in the two groups were observed and ***:The perioperative conditions of the patients in the study group,including intraoperative bleeding loss,operation time,tube retention time,and VAS scores,were 15.12±1.36,54.69±18.78,2.14±0.98,and 3.25±0.14,*** perioperative conditions of the patients in the control group,including intraoperative bleeding loss,operation time,tube retention time,and VAS scores,were 22.69±2.01,55.36±19.01,4.21±1.01,and 5.36±0.45,respectively;other than the operation time,the differences in intraoperative blood loss,tube retention time,and VAS scores between the two groups were statistically significant(p***:Treatment of spontaneous progressive hemopneumothorax in young people is better with single-port thoracoscopic bullectomy than with two-port thoracoscopic bullectomy,which effective

关键词： Spontaneous progressive hemopneumothorax Single-port thoracoscopic pulmonary bulla resection Double-port thoracoscopic pulmonary bulla resection

Clinical Application of Circulating Tumor Cells in Evaluating the Effect of Chemotherapy in Advanced Non-Small Cell Lung Cancer

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Proceedings of Anticancer Research 2022年第5期6卷 1-6页

作者： xuguang zhang Shaoyong Dong Zhenqing Sun Thoracic Surgery Department Affiliated Hospital of Hebei UniversityBaoding 071000Hebei ProvinceChina

Objective:To explore the value of circulating tumor cells in evaluating the effect of chemotherapy for advanced non-small cell lung ***:Sixty-two patients with advanced non-small cell lung cancer who received chemotherapy in the Affiliated Hospital of Hebei University from January 2018 to December 2021 were selected as the research *** positive rate of CTCs after two weeks of chemotherapy and four weeks of chemotherapy as well as the evaluation of imaging efficacy were observed and ***:Based on the clinical data of the patients,the positive rate of CTCs in male patients was 77.78%,that in female patients was 80.77%,that in patients≥60 years old was 78.13%,that in patients<60 years old was 76.67%,that in squamous cell carcinoma was 79.31%,that in adenocarcinoma was 78.79%,and that in highly differentiated,moderately differentiated,and poorly differentiated+undifferentiated CTCs was 66.67%,84.21%,and 90.91%,respectively;there was no statistical difference in the general *** positive rate of CTCs was 88.71%before chemotherapy and 66.13%after two weeks of chemotherapy,in which the difference was statistically significant;the positive rate of CTCs four weeks after chemotherapy was 59.68%,which was statistically significant compared with that before chemotherapy;however,there was no significant difference between two weeks after chemotherapy and four weeks after *** chemotherapy,35 patients had CR+PR,19 patients had SD,and 8 patients had *** proportions of CR+PR,SD,and PD in the imaging evaluation results were 56.45%,30.65%,and 12.90%,*** kappa consistency test,it was found that the consistency was ***:CTCs can be used as one of the indicators to evaluate the effect of chemotherapy for advanced non-small cell lung *** results are consistent with those of imaging *** detection of CTCs can be widely used as one of the clinical indicators.

关键词： Circulating tumor cells Non-small cell lung cancer Chemotherapy

Spatial-temporal Variation Characteristics of Sunshine Duration in China and Its Influence Factors

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Meteorological and Environmental Research 2020年第6期11卷 1-8页

作者： Fengjin XIAO xuguang zhang Yaoming LIAO Qiufeng LIU National Climate Center Beijing 100081China

Sunshine duration has an important impact on *** order to study the temporal and spatial variation of sunshine duration in China under the background of climate change,based on the observation data of 2089 national meteorological stations during 1961-2017,trend analysis,mutation analysis,partial correlation analysis,and Mann-Kendall mutation analysis were used to analyze the temporal and spatial variation characteristics of sunshine duration in different regions of China,and the influence of main climatic factors and human *** results showed that:the sunshine duration in China showed a significant decreasing trend with a rate of-45.8 h/10 a,and the sunshine duration in 7 regions of Northwestern China,Northern China,Northeastern China,Center China,Eastern China,Southern China,and Southwestern China also showed a significant *** spatial distribution of sunshine duration in China was characterized by"less in the south and more in the north",and the sunshine duration in the northern region was significantly higher than those in the southern *** sunshine duration in Tibet,Qinghai,Gansu and west Inner Mongolia was higher,while it was obviously lower in Sichuan *** M-K mutation test analysis,it was found that sunshine duration in the whole country decreased significantly,but there was no mutation station,while mutation occurred at 1989 in Southwestern China,1983 in Northwestern China,1985 in Northeastern ***,there was the highest sunshine duration in summer,followed by spring,autumn,and winter;the decline rate was also the highest in summer,followed by autumn,winter,and *** duration had a highly negative correlation with total cloud amount,visibility,haze,and precipitation,while had a strongly positive correlation with wind speed,and had no significant correlation with fog.

关键词： Sunshine duration Spatial-temporal distribution Trend Mutation Influence

An ultra-compact polarization-insensitive slot-strip mode converter

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 Optoelectronics 2022年第1期15卷 53-59页

作者： Zihan Tao Bo Wang Bowen Bai Ruixuan Chen Haowen Shu xuguang zhang Xingjun Wang State Key Laboratory of Advanced Optical Communication Systems and Networks School of ElectronicsPeking UniversityBeijing 100871China Frontier Science Center for Nano-Optoelectronics Peking UniversityBeijing 100871China Peking University Yangtze Delta Institute of Optoelectronics Nantong 226010China Peng Cheng Laboratory Shenzhen 518055China

Integrated waveguides with slot structures have attracted increasing attention due to their advantages of tight mode confinement and strong light-matter *** extensively studied,the issue of mode mismatch with other strip waveguide-based optical devices is a huge challenge that prevents integrated waveguides from being widely utilized in large-scale photonic-based *** this paper,we demonstrate an ultra-compact low-loss slot-strip converter with polarization insensitivity based on the multimode interference(MMI)*** sinusoidal profiles are adopted to allow for smooth connection between the slot and strip waveguide,resulting reflection *** manipulating the MMI effect with structure optimization,the self-imaging positions of the TE0 and TM0 modes are aligned with minimized footprint,leading to low-loss transmission for both *** measurement results show that high coupling efficiencies of−0.40 and−0.64 dB are achieved for TE_(0) and TM_(0) polarizations,*** device has dimensions as small as 1.1μm×1.2μm and composed of factory-available *** above characteristics of our proposed compact slot-strip converter makes it a promising device for future deployment in multi-functional integrated photonics systems.

关键词： Silicon photonics Slot-strip convertor Multimode interference(MMI) Polarization-insensitive

在线全文

学校读者我要写书评

暂无评论

算力网络支撑下的泛在化视频传输调度

计算机研究与发展 2023年第4期60卷 786-796页

作者：张旭光陈鸣锴魏昕南京邮电大学通信与信息工程学院南京210003 宽带无线通信与传感网技术教育部重点实验室(南京邮电大学) 南京210003

视频数据量的爆炸式增长、视频形式愈加多样、视频业务的泛在化是当前视频通信技术发展的三大特点,这无疑会导致核心网过载和视频传输调度难的问题.为了缓解这些问题,提出一种算力网络支撑下的泛在化视频传输调度方案.具体地,首先提出... 详细信息

视频数据量的爆炸式增长、视频形式愈加多样、视频业务的泛在化是当前视频通信技术发展的三大特点,这无疑会导致核心网过载和视频传输调度难的问题.为了缓解这些问题,提出一种算力网络支撑下的泛在化视频传输调度方案.具体地,首先提出一种视频层次化编解码模型提升视频内容部署和传输的灵活性;其次,考虑视频业务的差异化指标约束,提出面向业务的有效吞吐量模型;最后,借助算力网络的支撑,一方面通过任务分解来有效利用“碎片化”的网络资源,另一方面通过对网络状态的全局检测和实时感知,实现视频内容的精准部署和网络资源的高效调配.仿真实验验证了所提方案在核心网流量卸载、有效吞吐量提升、网络资源利用率提升方面的有效性.

关键词：算力网络泛在化视频视频调度有效吞吐量内容分发

在线全文

学校读者我要写书评

暂无评论

掺混菜籽油渣减少土壤入渗改善持水特性

农业工程学报 2017年第2期33卷 102-108页

作者：邢旭光张盼马孝义西北农林科技大学水利与建筑工程学院杨凌712100 西北农林科技大学旱区农业水土工程教育部重点实验室杨凌712100

针对目前植物油渣较少应用于农业生产的现状,为探明植物油渣对土壤水分运动和土壤持水特性的影响,采用室内一维土柱入渗试验,以耕作层土壤为研究对象,定量掺混植物油渣,对比研究3种不同掺混深度(14、24和34 cm)条件下的土壤水分入渗特性... 详细信息

针对目前植物油渣较少应用于农业生产的现状,为探明植物油渣对土壤水分运动和土壤持水特性的影响,采用室内一维土柱入渗试验,以耕作层土壤为研究对象,定量掺混植物油渣,对比研究3种不同掺混深度(14、24和34 cm)条件下的土壤水分入渗特性,并对掺混油渣土壤的持水能力进行分析。结果表明:1)Philip和Kostiakov入渗模型均可用于描述掺混油渣条件的土壤水分入渗特性及参数拟合(R^2>0.99);2)与纯土相比,掺混植物油渣可有效减小累积入渗量和入渗速率,根层掺混油渣(34 cm土层)最大可分别减少累积入渗量和入渗速率约11.0%和41.7%;3)入渗结束时基于土壤剖面水分分布特征,土壤掺混植物油渣有利于提高土壤饱和含水率和根层土壤含水率,与纯土相比分别提高约14.3%和11.3%,有效增强了土壤持水能力;4)土壤掺混植物油渣可增加黏粒和粉粒、降低砂粒含量。该研究可为农田生产中植物油渣推广奠定理论基础,同时为植物油渣的田间土壤改良及应用提供参考。

关键词：土壤水分入渗持水能力菜籽油渣