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A numerical study on the effect of column layout on air distribution and performance of column attachment ventilation

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Building Simulation 2021年第4期14卷 1095-1108页

作者： Haiguo Yin linna li Rui Wu Yuanyuan Wang Angui li School of Building Services Science and Engineering Xi’an University of Architecture and TechnologyShaanxiXi’an710055China

Based on the structural characteristics of existing buildings and the disadvantages of current mixed ventilation mode in the application to large space buildings,an original column attachment ventilation(CAV)has been *** this study,the experiment utilized a room space with four columns uniformly distributed in the space to visualize the movement of attached airflow along the cylinder surface and the floor,the numerical technique was employed to study the effects of the column layout(i.e.,uniform,centralized,dispersed,and crossed distribution)on the air distribution of CAV mode in a standard four-column full scale model of a shopping *** indices,including airflow pattern,air diffusion performance index(ADPI),air temperature distribution,heat removal effectiveness,draught rate(DR),predicted mean vote(PMV),and carbon dioxide(CO2)concentration,were used to assess the ventilation *** the CAV mode with a uniform column layout scheme,the experimental results indicated that the air supply flows downward along the wall surface,forming a secondary attachment with the ground and spreading along the floor in a fan radiation flow ***,an“air lake”-like speed and temperature distribution similar to displacement ventilation(DV)was formed in the occupied *** all simulation cases,it was found that the average air velocity was less than 0.25 m/s in occupied zone,the effectiveness for heat removal was more significant than 1.0,DR value was less than 20%,the PMV level can also satisfy most *** average CO2 concentration was around 470 ppm in the occupied breathing *** results indicated that the CAV mode could be an efficient air distribution *** demonstrated the technical feasibility of applying the CAV in the space under different column layout schemes.

关键词： column attachment ventilation air distribution column layout performance evaluation large space buildings

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Optimization of Wind-Marine Hybrid Power System Configuration Based on Genetic Algorithm

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Journal of Ocean University of China 2017年第4期16卷 709-715页

作者： SHI Hongda li linna ZHAO Chenyu College of Engineering Ocean University of China Qingdao 266100 P. R. China

Multi-energy power systems can use energy generated from various sources to improve power generation *** paper presents a cost-power generation model of a wind-tide-wave energy hybrid power system for use on a remote island,where the configuration is optimized using a genetic algorithm.A mixed integer programming model is used and a novel object function,including cost and power generation,is proposed to solve the boundary problem caused by existence of two *** this model,the final optimized result is found to have a good fit with local resources.

关键词： genetic algorithm cost-power generation function multi-energy system marine energy

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A New Algorithm for literature Recommendation Based on a Bibliographic Heterogeneous Information Network

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Chinese Journal of Electronics 2018年第4期27卷 761-767页

作者： li linna WANG lijun JIANG Xueqin HAN Hongqi ZHAI Yun Institute of Scientific and Technical Information of China E-Government Research Center Chinese Academy of Governance

A literature recommendation algorithm based on a heterogeneous information network is proposed. The proposed algorithm can process different types of semantic information and implicit feedback. The experimental results show that the proposed algorithm can provide more effective recommendations than those algorithms without employing these semantic information and implicit feedback.

关键词： literature recommendation algorithm Heterogeneous information network Meta-path Classification Bayesian ranking

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Private Car Travel Characteristics and Influencing Factors in Chinese Cities——A Case Study of Guangzhou in Guangdong,China

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Chinese Geographical Science 2009年第4期19卷 325-332页

作者： CAO Xiaoshu CHEN Hemei li linna ZHEN Feng School of Geography and Planning Sun Yat-Sen University Guangzhou 510275 China School of Geographic and Oceanographic Sciences Nanjing University Nanjing 210093 China

Taking Guangzhou as a case,this paper adopted a questionnaire survey to gather first-hand data and analyzed the characteristics and influencing factors of private car travel in Chinese *** the research indicated,trip purposes of private car travel are mainly commute and business affairs with a more flexible trip in the urban core *** trip intensities are concentrated in a certain extent,with trip frequency being lower in the urban core area than the peripheral *** addition,the trip time has two significant peaks occurring in the morning and afternoon,and one trough in the *** trip spatial distribution is mainly within commute with both residence and employment in urban area and inward commute with residence in suburban area while employment in urban *** kinds of commutes direct to the urban *** study also shows that the characteristics of private car travel are principally influenced by two aspects:travelers' attributes and urban *** main travelers' social and economic attributes influenced it include the gender,education attainment,age,driving experience and per capita monthly household *** urban characteristics influenced it mainly cover the land use pattern,public traffic facilities and spatial attributes of residential environment.

关键词： car travel travel characteristics private car Chinese cities Guangzhou

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Exploring the urban-rural development differences and influencing factors in the Huang-Huai-Hai Plain of China

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Journal of Geographical Sciences 2020年第10期30卷 1603-1616页

作者： CHENG Mingyang li linna ZHOU Yang Faculty of Geographical Science Beijing Normal UniversityBeijing 100875China Institute of Geographic Sciences and Natural Resources Research CASBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China

Uneven urban and rural development is one of the main reasons for the decline of the *** imbalance could be measured by the urban-rural difference index(URDI).Existing studies on urban-rural differences have focused on single dimension between urban and rural areas,and lack a systematic multi-dimensional *** on the construction of an index system and model for measuring urban-rural differences,this study took the Huang-Huai-Hai Plain(HHHP)as the study area,explores the spatial pattern of urban-rural differences in the area,and used geographical weighted regression models to identify the factors affecting urban-rural development *** show that the mean value of URDI in the HHHP was 0.295,and the URDI in its western region was higher than that in the *** average URDI was relatively high in the western counties along the Beijing–Guangzhou *** low level of urban-rural'population-land-industry'development in the HHHP is an important reason for the small differences between urban and rural *** in road transportation infrastructure have led to an increase in the urban-rural development ***,the driving force of the road network on urban development is greater than that on rural *** role of county economic agglomeration is gaining *** the process of rapid economic development,more attention should be paid to the development of the rural economy and the overall revitalization of the *** equivalent allocation of social service facilities is an effective way to solve the problem of urban-rural *** analysis demonstrated that terrain factors have relatively little influence on the *** study provides a new perspective and measurement method for understanding the integration of urban and rural development,and provides a useful reference for guiding the urban-rural integration development and the rural revitalization.

关键词： urban-rural difference index(URDI) population-land-industry urban-rural relationship rural revitalization Huang-Huai-Hai Plain(HHHP) China

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Nonlinear relationship between urban form and transport CO_(2)emissions:Evidence from Chinese cities based on machine learning

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Journal of Geographical Sciences 2024年第8期34卷 1558-1588页

作者： li linna DENG Zilin HUANG Xiaoyan Faculty of Geographical Science Beijing Normal UniversityBeijing 100875China Northwest Land and Resources Research Center Global Regional and Urban Research InstituteShaanxi Normal UniversityXi'an 710119China

Reducing carbon emissions from the transport sector is essential for realizing the carbon neutrality goal in *** substantial studies on the influence of urban form on transport cO_(2)emissions,most of them have treated the effects as a linear process,and few have studied their nonlinear *** research focused on 274 Chinese cities in 2019 and applied the gradient-boosting decision tree(GBDT)model to investigate the nonlinear effects of four aspects of urban form,including compactness,complexity,scale,and fragmentation,on urban transport CO_(2)*** was found that urban form contributed 20.48%to per capita transport CO_(2)emissions(PTCEs),which is less than the contribution of socioeconomic development but more than that of transport *** contribution of urban form to total transport CO_(2)emissions(TCEs)was the lowest,at 14.3%.In particular,the effect of compactness on TCEs was negative within a threshold,while its effect on PTCEs showed an inverted U-shaped *** effect of complexity on PTCEs was positive,and its effect on TCEs was *** effect of scale on TCEs and PTCEs was positive within a threshold and negative beyond that *** effect of fragmentation on TCEs was also nonlinear,while its effect on PTCEs was positively *** results show the complex effects of the urban form on transport CO_(2)***,strategies for optimizing urban form and reducing urban transport carbon emissions are recommended for the future.

关键词： urban form transport CO,emissions nonlinear effect sustainable transport gradient-boosting decision treemodel

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Identifying multidisciplinary problems from scientific publications based on a text generation method

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Journal of Data and Information Science 2024年第3期9卷 213-237页

作者： Ziyan Xu Hongqi Han linna li Junsheng Zhang Zexu Zhou Institute of Scientific and Technical Information of China Beijing 100038China

Purpose:A text generation based multidisciplinary problem identification method is proposed,which does not rely on a large amount of data ***/methodology/approach:The proposed method first identifies the research objective types and disciplinary labels of papers using a text classification technique;second,it generates abstractive titles for each paper based on abstract and research objective types using a generative pre-trained language model;third,it extracts problem phrases from generated titles according to regular expression rules;fourth,it creates problem relation networks and identifies the same problems by exploiting a weighted community detection algorithm;finally,it identifies multidisciplinary problems based on the disciplinary labels of ***:Experiments in the“Carbon Peaking and Carbon Neutrality”field show that the proposed method can effectively identify multidisciplinary research *** disciplinary distribution of the identified problems is consistent with our understanding of multidisciplinary collaboration in the *** limitations:It is necessary to use the proposed method in other multidisciplinary fields to validate its *** implications:Multidisciplinary problem identification helps to gather multidisciplinary forces to solve complex real-world problems for the governments,fund valuable multidisciplinary problems for research management authorities,and borrow ideas from other disciplines for ***/value:This approach proposes a novel multidisciplinary problem identification method based on text generation,which identifies multidisciplinary problems based on generative abstractive titles of papers without data annotation required by standard sequence labeling techniques.

关键词： Problem identification Multidisciplinary Text generation Text classification

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Study on PID Control System Based on Genetic Algorithms

Study on PID Control System Based on Genetic Algorithms

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2012年计算机应用与系统建模国际会议

作者： linna li Wanbao Bo Bin Jiang School of Electrical Engineering and Information Technology Changchun Institute of Technology Air Force Aviation University

As for the characteristics of hysteretic, nonlinear and time-varying after aeration process, the control of the dissolved oxygen concentration DO is as the mathematical model object, with the use of fuzzy PDI control strategy through the comparison among the MATLAB simulation, PDI control and the applicable results for the conventional fuzzy control strategy. Because the fuzzy control parameters of the fixed PDI can’t be guaranteed various conditions on the control effect of DO, thus, genetic algorithms can’t be automatically optimized several key parameters to design the fuzzy PDI control: the membership function, rule table of fuzzy control and the scale factor, then MATLAB simulation is carried out, with the comparison among the PDI control based on genetic algorithms, conventional fuzzy control strategy and the simulation results.

关键词： Fuzzy Control Genetic Algorithm PID Control Sewage Treatment

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Experimental investigation on dynamic response of chamber to simulate deepwater explosive

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Engineering Sciences 2014年第6期12卷 85-89页

作者： Zhong Dongwang Tu Shengwu li linna College of Science Wuhan University of Science and Technology

Experimental investigation was conducted for the dynamic response of a real spherical explosive chamber that can simulate 200 m deepwater explosive loaded 10 g TNT *** vibration characteristics and dynamic strength of the chamber were analyzed by measuring the strain profiles of six characteristic points on the *** research results revealed the rule of the dynamic response of the chamber on different explosive loads and static *** provides references for the design and development of the chamber to simulate deepwater explosion.

关键词： deepwater explosive explosive chamber dynamic response strain

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Research on Question Answering System for COVID-19 Based on Knowledge Graph

Research on Question Answering System for COVID-19 Based on ...

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第40届中国控制会议

作者： Kai Ding Hongqi Han linna li Menglin Yi Research Center for Information Science Theory and Methodology Institute of Scientific and Technical Information of China Key Laboratory of Rich-media Knowledge Organization and Service of Digital Publishing Content SAPPRFT

In the context of the COVID-19 epidemic,it is necessary to establish a question answering（QA） system to help people to get information about the *** paper creats a framework about the question answering system based on knowledge bases（KBQA） for ***,we design the schema of the COVID-19 knowledge graph（KG） and extract knowledge from ***,a rule-based classifier is created to find the user’s intention when they input a ***,the matched template is used to transfer the question into Cypher query,and return answer which is retrieved from KG to *** collected data from Baidu Encyclopedia and extracted triplet knowledge for constructing COVID-19 KG to prove the feasibility of our *** experiment on 86 questions shows that the KBQA for COVID-19 can achieve 81.6% accuracy and get a good experience through the feedback of testers.

关键词： COVID-19 Knowledge Graph Question Answering System Neo4j

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