检索结果-南通市图书馆

Multiusers Parallel Competitive Channel Protocol Based on Unsaturated Service

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Communications 2023年第9期20卷 96-114页

作者： Yong Li Miao Gao Xin Xu Guang Zheng hongbo qiao Xinming Ma Ping Dong College of Information and Management Science Henan Agricultural UniversityZhengzhou 450046China Henan Engineering Laboratory of Farmland Monitoring and Control Zhengzhou 450046China

In order to enhance the area throughput of next generation wireless local area network(WLAN)in high density scenarios,orthogonal frequency division multiple access(OFDMA)has been adopted as one of the key technologies in the next generation WLAN communication ***,the performance of the existing media access control(MAC)degrades significantly under unsaturated ***,this paper proposes a multi-user parallel contention channel MAC(MU-MAC)based on unsaturated services,which can effectively reduce the channel access conflict and improve the OFDMA access efficiency of cluster member *** this basis,MU-MAC is enhanced for the spatial clustering group(SCG)formation protocol and support for the unsaturated service ***,the optimal access radius when the service is in a non-saturated state is analyzed to make the relevant theoretical analysis more generally,and the expressions for the throughput and area throughput of the proposed protocol are modeled and *** simulation results verify the correctness of the theoretical analysis and the efficiency of the protocol *** results show that MU-MAC outperforms IEEE 802.11ax and OMAX protocol in area throughput by 40.72%and 104.15%,respectively.

关键词： wireless local area network high density deployment scenarios unsaturated services spatial clustering group

Effects of Light on Tree Growth

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Agricultural Biotechnology 2018年第4期7卷 181-186页

作者： Fengsheng SUN Kehua WANG hongbo qiao Dequan ZHANG Dejin DONG Forestry Science and Technology Training Center of Shandong Province Jinan 250014China Forestry Survey and Planning Institute of Shandong Province JinanChina250014

Empirical equations were used to fit tree growth through the analysis of parse wood data, functions with tree growth amount as the dependent variable and annual sunshine duration as the independent variable. According to arithmetical operations like derivation of the functions, the relative contribution rate of light to tree growth was 64.8%, which was almost equal to the relative contribution rate of precipitation to tree growth. Therefore, the light and precipitation were of equal importance to tree growth.

关键词： Empirical equation Parse wood Annual sunshine duration

Study on Mature Age of An Individual Robinia pseudoacacia

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Agricultural Biotechnology 2018年第5期7卷 184-185,190页

作者： hongbo qiao Kehua WANG Xingyun GAO Xueqiang ZHANG Dequan ZHANG Forestry Survey and Planning Institute of Shandong Province Jinan 250014China

Through the study of parse wood materials, the fitting empirical equation of tree growth was obtained, a function with tree growth as a variable and time as an independent variable. The mature age of tree growth was obtained through mathematical operations such as function derivation. The obtained expected maturity ages for the actual forests of Robinia pseudoacacia were 36, 46 and 56 a, respectively, which could be the mature ages for commercial forest, protection forest and special-purpose forest. And the application, research directions and precautions of the mature ages were proposed.

关键词： Mature age Empirical equation Parse wood

Study on Expected Mature Age of Individual Ailanthus altissima

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Agricultural Biotechnology 2019年第5期8卷 90-91,98页

作者： Bin CHANG Haifeng DONG hongbo qiao Dequan ZHANG Kehua WANG Shijiang LI Yaoxiang Forest Farm Department of Natural Resources of Shandong ProvinceTai'an 250014China Daiyue District Ecological Forestry Development Center Tai'an CityShandong ProvinceTai'an 271000China Shandong Province Forestry Monitoring and Planning Institute Ji'nan 250014China

This study was conducted on the analytic tree and got the fitting empirical equation of tree growth,in which the tree growth rate was used as the variable and time as the independent *** arithmetical operation to the function got the mature age of tree growth,and the expected mature age of Ailanthus altissima was 21 *** addition,the application as well as the research direction and matters needing attention were proposed.

关键词： Ailanthus altissima Expected mature age Empirical equation Analytic tree

Discussion on Individual Expected Maturity of Populus canadensis Moench

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Agricultural Biotechnology 2018年第5期7卷 168-170页

作者： Xingyun GAO Mingliang WEI Kehua WANG hongbo qiao Dequan ZHANG Dejin DONG Forestry Survey and Planning Institute of Shandong Province Jinan 250014China

Through the study of parse wood materials in Shandong Province, the fitting empirical equation of tree growth was obtained, a function with tree growth was a variable and time as an independent variable. Through mathematical operations such as function derivation, the mature age of tree growth was obtained. The obtained expected maturity age for Populus canadensis Moench forest was 11 a for pulp material, 26 a for pillar materials and 41 a for peeler. And the application, research directions and precautions of the mature ages were proposed.

关键词： Expected maturity age Empirical equation Parse wood

Study on Expected Mature Age of Individual Saliz matsudana

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Agricultural Biotechnology 2019年第3期8卷 150-152页

作者： Lingling LI Keqin LI Jing ZHANG Dequan ZHANG Zhijun YANG hongbo qiao Laizhou Forest Resources Monitoring and Protection Service Center Shandong ProvinceLaizhou 261400China Wenfeng Road Street Agricultural Comprehensive Service Station Laizhou261400China Shandong Forestry Monitoring and Planning Institute Jinan 250014China

Based on the study of parse wood materials,the fitting empirical equation of tree growth was obtained,a function with tree growth as a variable and time as an independent *** mathematical operations such as function derivation,the mature age of tree growth was obtained,and the obtained expected mature age of Saliz matsudana was *** the application,research directions and precautions of the mature ages were proposed.

关键词： Mature age Empirical equation Parse wood

Study on Mature Age of An Individual Pinus thunbergii Parl

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Agricultural Biotechnology 2018年第5期7卷 156-158页

作者： Kehua WANG hongbo qiao Xingyun GAO Wei ZHANG Mingliang WEI Fengzhen WANG Xueqiang ZHANG Forestry Survey and Planning Institute of Shandong Province Jinan 250014China

Through the study of parse wood materials, the fitting empirical equation of tree growth was obtained, a function with tree growth as a variable and time as an independent variable. Through mathematical operations such as function derivation, the mature age of tree growth was obtained. The obtained maturity age for the actual forest of Pinus thunbergii Parl was 51 a, and the ideal mature age was 66 a. And the application, research directions and precautions of the mature ages were proposed.

关键词： Mature age Empirical equation Parse wood

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

基于融合对抗训练的农作物品种信息抽取方法

农业机械学报 2023年第12期54卷 272-279,337页

作者：许鑫马文政张浩马新明乔红波河南农业大学信息与管理科学学院郑州450002

针对我国作物品种种类多,资源信息规范性差,模型训练精度低等问题,本文以小麦、水稻、玉米、大豆、棉花、花生、油菜7种作物为对象,以品种、形态、产量和品质等参数为指标,构建了83个品种实体,采用人工标注方法,通过融合对抗训练技术,... 详细信息

针对我国作物品种种类多,资源信息规范性差,模型训练精度低等问题,本文以小麦、水稻、玉米、大豆、棉花、花生、油菜7种作物为对象,以品种、形态、产量和品质等参数为指标,构建了83个品种实体,采用人工标注方法,通过融合对抗训练技术,提出了农作物品种信息抽取4层网络模型(BERT-PGD-BiLSTM-CRF)。模型基于深层双向Transformer构建的BERT(Bidirectional encoder representation from transformers)模型作为预训练模型获取字词语义表示,使用PGD(Projected gradient descent)对抗训练方法为样本增加扰动,提高模型鲁棒性和泛化性,利用双向长短期记忆网络(Bidirectional long short-term memory, BiLSTM)学习长距离文本信息,结合条件随机场(Conditional random field, CRF)学习标签约束信息。对比18个不同信息抽取模型的训练效果,结果表明,本研究提出的BERT-PGD-BiLSTM-CRF模型精确率为95.4%、召回率为97.0%、F1值为96.2%,说明利用对抗训练技术的BERT-PGD-BiLSTM-CRF模型能够有效对作物品种信息进行抽取,同时也为农业信息抽取提供了技术参考。

关键词：农作物品种信息抽取 BERT 对抗训练

对比特币技术特点优势分析及国家相关政策介绍

维普期刊数据库

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

中国商论 2022年第8期 92-94页

作者：乔弘博齐鲁工业大学(山东省科学院) 山东济南250300

2008年美国发生席卷全球的次贷危机,中本聪横空出世推出比特币,2009年1月3日,比特币第一个区块诞生,在接下来的十二年间,比特币成为人们最热议的话题之一,越来越多的人也参与到区块链领域。本文主要介绍了以区块链为底层技术的比特币,... 详细信息

2008年美国发生席卷全球的次贷危机,中本聪横空出世推出比特币,2009年1月3日,比特币第一个区块诞生,在接下来的十二年间,比特币成为人们最热议的话题之一,越来越多的人也参与到区块链领域。本文主要介绍了以区块链为底层技术的比特币,分析了国家各项政策对比特币的态度,展望了比特币未来的发展。

关键词：比特币数字货币区块链非对称性加密分布式