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A review of road 3D modeling based on light detection and ranging point clouds

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Journal of Road Engineering 2024年第4期4卷 386-398页

作者： Bin yu yuchen Wang Qihang Chen Xiaoyang Chen yuqin Zhang Kaiyue luan Xiaole Ren School of Transportation Southeast UniversityNanjing 211189Chind

Increasing development of accurate and efficient road three-dimensional(3D)modeling presents great opportunities to improve the data exchange and integration of building information modeling(BIM)models.3D modeling of road scenes is crucial for reference in asset management,construction,and *** detection and ranging(Li DAR)technology is increasingly employed to generate high-quality point clouds for road *** this paper,we specifically investigate the use of Li DAR data for road 3D *** purpose of this review is to provide references about the existing work on the road 3D modeling based on Li DAR point clouds,critically discuss them,and provide challenges for further ***,we introduce modeling standards for roads and discuss the components,types,and distinctions of various Li DAR measurement ***,we review state-of-the-art methods and provide a detailed examination of road segmentation and feature ***,we systematically introduce point cloud-based 3D modeling methods,namely,parametric modeling and surface *** and rules are used to define model components based on geometric and non-geometric information,whereas surface modeling is conducted through individual faces within its ***,we discuss and summarize future research directions in this *** review can assist researchers in enhancing existing approaches and developing new techniques for road modeling based on Li DAR point clouds.

关键词： Road engineering LiDAR data 3D modeling Point cloud Segmentation Key feature extraction

Periodic Solutions of Nonautonomous Second Order Hamiltonian Systems

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Acta Mathematica Sinica,English Series 2005年第4期21卷 685-690页

作者： Shi Xia luan An Min MAO Department of Mathematics Qufu Normal University Qufu 273165. P. R. China Institute of Mathematics Academy of Mathematics and Systems Science Chinese Academy of Sciences. Beijing 100080. P. R. China

In this paper, we develop the local linking theorem given by Li and Willein by replacing the Palais-Smale condition with a Cerami one, and apply it to the study of the existence of periodic solutions of the nonautonomous second order Hamiltonian systems （H） ü＋A（t）u＋∨V（t, u）=0, u∈R^N, t∈R. We handle the case of superquadratic nonlinearities which differ from those used previously. Our results extend the theorems given by Li and Willem.

关键词： Non-autonomous Hamiltonian systems Periodic solutions Local linking Critical point theory Variational method

Current and future research directions in cellular metabolism of colorectal cancer:A bibliometric analysis

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World Journal of Gastrointestinal Oncology 2024年第8期16卷 3732-3737页

作者： Bo-Wen Jiang Xiu-Hua Zhang Rui Ma Wen-yu luan Yan-Dong Miao Department of Emergency Yantai Affiliated Hospital of Binzhou Medical UniversityThe Second Medical College of Binzhou Medical UniversityYantai 264100Shandong ProvinceChina Department of Oncology Laiyang Central HospitalYantai 265200Shandong ProvinceChina Department of Cancer Center Yantai Affiliated Hospital of Binzhou Medical UniversityThe Second Medical College of Binzhou Medical UniversityYantai 264100Shandong ProvinceChina

The primary aim of this study was to analyze the evolving trends and key focal points in research on cellular metabolism of colorectal cancer(CRC).Relevant publications on cellular metabolism in CRC were sourced from the Science Citation Index Expanded within the Web of Science Core Collection *** analysis and visualization were conducted using VOSviewer(version 1.6.18)software and CiteSpace 6.1.R6(64-bit)Basic.A comprehensive compilation of 4722 English-language publications,covering the period from January 1,1991 to December 31,2022,was carefully identified and included in the *** the authors,“Ogino,Shuji”contributed the most publications in this field,while“Giovannucci,E”garnered the highest number of *** journal“Cancer Research”ranked first in both publication volume and ***,“Shanghai Jiao Tong University”emerged as the top contributor in terms of published articles,while“Harvard University”led in citation *** country-based analysis,the United States held the top position in both publication output and citations,closely followed by *** increasing recognition of the significance of cellular metabolism in CRC underscores its potential for novel therapeutic approaches aimed at improving CRC management and prognosis.

关键词： Cellular metabolism Colorectal cancer Bibliometric analysis Metabolic reprogramming Cellular metabolism

Cartoon capture by key-frame based contour tracking

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Journal of Zhejiang University-Science C(Computers and Electronics) 2011年第1期12卷 36-43页

作者： Chun-luan ZHOU Jun XIAO Institute of Artificial Intelligence School of Computer Science and Technology Zhejiang Univetrsity Hangzhou 310027 China

Traditional cartoons have been widely used in entertainment,education,and ***,a large amount of cartoon data is *** this paper,we propose a new technique for capturing the motion of a character in an existing cartoon *** technique tracks the contours of the cartoon character in the sequence,and key frames are used to guide the *** model contour tracking as a space-time optimization problem in which an energy function including both temporal and spatial constraints is ***,the user labels the contours of the character on the key ***,the contours on the intermediate frames are tracked by minimizing the energy *** user may need to interactively adjust the tracking result and restart the optimization process to refine the ***,an edge snapping algorithm is applied to make the tracking result more *** show that our technique works effectively.

关键词： Cartoon reuse Cartoon capture Key frame Contour tracking

Simulation of a Shock Tube with a Small Exit Nozzle

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Journal of Thermal Science 2018年第1期27卷 34-38页

作者： Yigang luan Matthias Olzmann Franco Magagnato Harbin Engineering University HarbinChina Karlsruhe Institute of Technology(KIT) Institute of Physical ChemistryKaiserstrasse 1276131 KarlsruheGermany Karlsruhe Institute of Technology(KIT) Institute of Fluid MechanicsKaiserstrasse 1276131 KarlsruheGermany

Shock tubes are frequently used to rapidly heat up reaction mixtures to study chemical reaction mechanisms and kinetics in the field of combustion chemistry [1]. In the present work, the flow field inside a shock tube with a small nozzle in the end plate has been investigated to support the analysis of reacting chemical mixtures with an attached mass spectrometer and to clarify whether the usual assumptions for the flow field and the related ther- modynamics are fulfilled. In the present work, the details of the flow physics inside the tube and the flow out of the nozzle in the end plate have been investigated. Due to the large differences in the typical length scales and the large pressure ratios of this special device, a very strong numerical stiffness prevails during the simulation process. Second-order ROE numerical schemes have been employed to simulate the flow field inside the shock tube. The simulations were performed with the commercial code ANSYS Fluent [2]. Axial-symmetric boundary conditions are employed to reduce the consumption of CPU time. A density-based transient scheme has been used and vali- dated in terms of accuracy and efficiency. The simulation results for pressure and density are compared with ana- lytical solutions. Numerical results show that a density-based numerical scheme performs better when dealing with shock-tube problems [5]. The flow field near the nozzle is studied in detail, and the effects of the nozzle to pressure and temperature variations inside the tube are invcstigatcd. The results show that this special shock-tube setup can be used to study high-temperature gas-phase chemical reactions with reasonable accuracy.

关键词： CFD shock tube low pressure numerical scheme

Chitosan Obtained from Cell Wall of Aspergillus Niger Mycelium

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Chemical Research in Chinese Universities 2004年第2期20卷 156-158页

作者： HUANGHui-li LINWen-luan LINJian-ming CollegeofMaterialsScienceandEngineering HuaqiaoUniversityQuanzhouP.R.China

Chitin from cell walls of Aspergillus Niger mycelium was prepared. A new method for the preparation of high deacetylation degree chitosan was studied in a dilute sodium hydroxide solution at a high pressure. The experimental results indicate that the deacetylation degree of the chitosan can reach 80% under the condition of a 5.00 mol/L sodium hydroxide solution at 0.1 MPa of pressure for 1 h. This method shows the advantages of the applications in the industry production and environment protection.

关键词： Aspergillus Niger Chitosan Deacetylation degree

Challenges in Treatment of Primary Sjogren’s Syndrome and Opportunities for Chinese Medicine

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Chinese Journal of Integrative Medicine 2020年第7期26卷 483-485页

作者： HOU Jia-qi XUE luan Department of Rheumatology and Immunology Yueyang Hospital of Integrated Traditional Chinese and Western MedicineShanghai University of Traditional Chinese MedicineShanghai(200437)China

Primary Sjogren’s syndrome is a chronic autoimmune disease that can lead to systemic *** present,immunomodulatory agents have not shown good efocacy,many patients in China seek Chinese medicine *** medicine can comprehensively improve the symptoms of patients through Chinese pattern diagnosis and individualized *** researches are providing scientioc bases for the therapeutic effect of Chinese *** Chinese medicine treatment can be integrated into the conventional management of primary Sjogren’s syndrome.

关键词： primary Sjogren's syndrome immunomodulatory agents Chinese medicine

Theoretical design for zeolite synthesis

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Science China Chemistry 2022年第9期65卷 1683-1690页

作者： Qinming Wu Huimin luan Feng-Shou Xiao Key Lab of Biomass Chemical Engineering of Ministry of Education College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027China Key Lab of Applied Chemistry of Zhejiang Province Department of ChemistryZhejiang UniversityHangzhou 31007China

Zeolites,an important class of microporous crystals,have been widely utilized in the fields of catalysis,ion-exchange,separation,and sorption for a long *** general,zeolites are synthesized in the presence of costly organic templates under hydrothermal conditions by trial-and-error method,which is not only environmentally unfriendly but also *** recent years,novel concepts of design for zeolite synthesis,which are sustainable,cheap,simple,and efficient,have been *** this review,the recent advances in design for zeolite synthesis will be briefly summarized,mainly including the design of organic templates for directing the formation of zeolites,design of organotemplate-free route for zeolite synthesis,design of solvent-free strategy for zeolite synthesis,design for novel interzeolite transformation,and targeted control of zeolite *** review might be helpful for developing sustainable routes for targeted synthesis of zeolites in the future.

关键词： zeolite organic template organotemplate-free solvent-free interzeolite transformation morphology control

Two new species of Family Prasiolaceae (Prasiolales,Chlorophyta) from China Sea

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Acta Oceanologica Sinica 2009年第6期28卷 118-122页

作者： luan Rixiao HUANG Bingxin DING Lanping luan Shujun Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China Dalian Museum of Natural Histroy of Liaoning Province Dalian 116023 China

Amomg the BO known species of the algal family Prasiolaceae （Prasiolales, Chlorophyta}, nine marine species have been found in marine environments but none in China seas. We reported here two new species Prasiola fangchengensis luan et Ding sp. nov. and Prasiola volcanica luan et Ding sp. nov. from subtropical coastal water of southern China.

关键词： prasiolaeeae new species Prasiola fangchengensis luan et Ding sp. nov. Prasiola volcanica luan et Ding sp. nov. China Sea