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航班延误特征可视分析方法

计算机工程与设计 2024年第10期45卷 3161-3169页

作者：贺怀清韩丽旸周钢宋淼刘浩翰惠康华中国民航大学计算机科学与技术学院天津300300 中国民航信息网络股份有限公司科技管理部北京101300

为分析航班延误发生规律,提出一种数学模型联合多视图协同的可视分析方法。对SEIR传染病传播模型进行调整,建立航班延误传播模型分析延误的传播特征,在此基础上,运用频繁子图挖掘算法提取延误频繁模式;设计基于中点分割的地图网络图、... 详细信息

为分析航班延误发生规律,提出一种数学模型联合多视图协同的可视分析方法。对SEIR传染病传播模型进行调整,建立航班延误传播模型分析延误的传播特征,在此基础上,运用频繁子图挖掘算法提取延误频繁模式;设计基于中点分割的地图网络图、矩阵热力图和时序图,分析延误的时空分布特征;设计VA-FDC系统用于方法验证。实验结果表明,VA-FDC能够有效分析航班延误时空分布特征,依据航班延误传播模型准确描述延误传播特征,为相关部门有效措施的制定提供借鉴。

关键词：航班延误时空分布特征延误传播模型频繁子图挖掘延误传播路径延误频繁模式多视图协同

基于正交试验法优化高温还原铁系结晶艺术釉配方

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中国陶瓷 2024年第7期60卷 74-81页

作者：刘华兰张海佳彭丁虞澎澎冯果缪松兰长沙海关技术中心长沙410004 景德镇陶瓷大学景德镇333403 国家日用及建筑陶瓷工程技术研究中心景德镇333001

通过正交试验对结晶釉化学组成中主要影响因素:K_(2)O+Na_(2)O、K_(2)O/Na_(2)O、SiO_(2)/Al_(2)O_(3)、SiO_(2)、CaO/MgO、BaO、ZnO、Fe_(2)O_(3)进行定量并确定主次关系,制备出适合景德镇梭式窑烧成制度的铁系结晶艺术釉,解决流釉粘... 详细信息

通过正交试验对结晶釉化学组成中主要影响因素:K_(2)O+Na_(2)O、K_(2)O/Na_(2)O、SiO_(2)/Al_(2)O_(3)、SiO_(2)、CaO/MgO、BaO、ZnO、Fe_(2)O_(3)进行定量并确定主次关系,制备出适合景德镇梭式窑烧成制度的铁系结晶艺术釉,解决流釉粘足、析晶保温时间过长的问题。得出釉料中组成(wt%)为:Si O_(2)68.9%,Al_(2)O_(3)5.3%,Fe_(2)O_(3)2.6%,CaO 5.3%,MgO11.9%,K_(2)O 1.3%,Na_(2)O 2.6%,BaO 0.7%,ZnO 1.3%,TiO_(2)0.1%时,可得到底色黄绿,圆点状墨绿色晶体均匀分布的结晶釉。

关键词：结晶釉正交试验法还原气氛

临床药物治疗学混合教学模式及实施路径改革创新——以包头医学院学生为例

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科教文汇 2024年第5期 87-90页

作者：段超慧张红丽邱敏宋淼包头医学院内蒙古包头014040

“临床药物治疗学”是包头医学院药学专业的核心课程,对培养具有指导临床合理用药能力的药学工作者发挥重要作用。鉴于目前该门课程存在教学体系尚不完善、学生学习积极性及主动性不强等问题,本教研室在教学过程中从课时安排、教学模式... 详细信息

“临床药物治疗学”是包头医学院药学专业的核心课程,对培养具有指导临床合理用药能力的药学工作者发挥重要作用。鉴于目前该门课程存在教学体系尚不完善、学生学习积极性及主动性不强等问题,本教研室在教学过程中从课时安排、教学模式、考核方法等方面,对“临床药物治疗学”的课程体系进行了创新尝试,建立了一套符合我校教学特色的课程教学体系。该文主要介绍本门课程的教学实践经验和实施路径,以期为高层次医学创新人才培养模式提供借鉴和参考。

关键词：临床药物治疗学教学模式实施路径新医科

Driving decision-making analysis of car-following for autonomous vehicle under complex urban environment

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Journal of Central South University 2017年第6期24卷 1476-1482页

作者： CHEN Xue-mei JIN Min miao Yi-song ZHANG Qiang School of Mechanical Engineering Beijing Institute of TechnologyBeijing 100081China

The decision-making under complex urban environment become one of the key issues that restricts the rapid development of the autonomous vehicles. The difficulty in making timely and accurate decisions like human beings under highly dynamic traffic environment is a major challenge for autonomous driving. Car-following has been regarded as the simplest but essential driving behavior among driving tasks and has received extensive attention from researchers around the world. This work addresses this problem and proposes a novel method RSAN(rough-set artificial neural network) to learn the decisions from excellent human drivers. A virtual urban traffic environment was built by Pre Scan and driving simulation was conducted to obtain a broad set of relevant data such as experienced drivers' behavior data and surrounding vehicles' motion data. Then, rough set was used to preprocess these data to extract the key influential factors on decision and reduce the impact of uncertain data and noise data. And the car-following decision was learned by neural network in which key factor was the input and acceleration was the output. The result shows the better convergence speed and the better decision accuracy of RSAN than ANN. Findings of this work contributes to the empirical understanding of driver's decision-making process and it provides a theoretical basis for the study of car-following decision-making under complex and dynamic environment.

关键词： autonomous vehicle car-following decision-making rough set (RS) artificial neural network (ANN) PreScan

Atomic scale structure dominated FCC and B2 responses to He ion irradiation in eutectic high-entropy alloy AlCoCrFeNi_(2.1)

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Journal of Materials Science & Technology 2022年第34期129卷 87-95页

作者： Jingyu Pang Ting Xiong Wenfan Yang Hualong Ge Xiaodong Zheng miao song Hongwei Zhang Shijian Zheng Institute of Metal Research Chinese Academy of Sciences7Shenyang 110016China School of Material Science and Engineering University of Science and Technology of ChinaShenyang 110016China Ji Hua Laboratory Foshan 528251China School of Nuclear Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of TechnologyTianjin 300130China

Radiation-tolerant materials are widely desired in nuclear reactors. High-entropy alloys(HEAs) exhibiting superior mechanical performance and swelling tolerance are being considered as next-generation nuclear structural materials. However, an understanding of HEAs irradiation tolerance at an atomic scale is still lacking. In this study, the atomic scale irradiation response of AlCoCrFeNi_(2.1), composed of face-centered cubic(FCC) phase and B2 phase, has been systematically investigated at 298 and 723 K. The bubble volume ratio of the B2 phase is much larger than that of the FCC phase under the same irradiation conditions, and hence, the FCC phase has superior swelling tolerance than the B2 phase. Also, order-disorder transformation occurred in both L12and B2 phases. The different irradiation responses between the FCC and B2 phases, depend firstly on composition and secondly on crystal structure. The higher compositional complexity and complicated atomic-level lattice environment of the FCC phase contribute to better radiation performance than B2 phase. The results pave a way for exploring radiation-tolerant structural high-entropy alloys.

关键词： High-entropy alloy AlCoCrFeNi_(2.1) He ion irradiation Radiation tolerance Electron microscopy

Synthesis of TiCl_(2) powders through reactive gas phase infiltration in a fluidized bed reactor

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Particuology 2021年第4期19卷 95-103页

作者： miao song Yafeng Yang Hongdan Zhao Maoqiao Xiang Qingshan Zhu Jibin Jia Chaoquan Hu Fen Yue State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China Innovation Academy for Green Manufacture Chinese Academy of SciencesBeijing 100190China Nanjing IPE Institute of Green Manufacturing Industry Nanjing 211135China

TiCl_(2) is a promising precursor for producing metallic titanium alloys and titanium-based ***,the effective synthesis of high-quality TiCl_(2) powder remains ***,a fluidized bed reactor(FBR)providing a high gas-solid contact area was employed to synthesize TiCl_(2) powder using a reliable TiCl_(4)-Ti reaction *** reaction conditions(600℃and 120 min)were determined for the proposed Ti-TiCl_(4) system by kinetic investigation.A dense Ti layer was regenerated upon the original surface of the Ti powder as a result of TiCl_(2) disproportionation at high temperature(above 700℃),which impeded infiltration by gaseous TiCl_(4).The particle size of the Ti reducing agent played a vital role in the production of TiCl_(2) powder.A mean particle size of 24.5μm was confirmed to be the most feasible option based on the optimal chlorinated depth(17μm).

关键词： Titanium dichloride Fluidization Kinetics Analysis

A new traffic allocation algorithm in Ad hoc networks

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The Journal of China Universities of Posts and Telecommunications 2006年第3期13卷 57-60页

作者： LI Xin miao Jian-song SUN Dan-dan ZHOU Li-gang DING Wei Broad-band Communication Network Laboratory Beijing University of Postsand Telecommunications Beijing 100876 China

A dynamic traffic distribution algorithm based on the minimization product of packet delay and packet energy consumption is proposed. The algorithm is based on packet delay and energy consumption in allocating traffic, which can optimize the network performance. Simulation demonstrated that the algorithm could dynamically adjust to the traffic distribution between paths, which can minimize the product of packet delay and energy consumption in mobile Ad hoc networks.

关键词： mobile Ad hoc networks traffic distribution delay,energy consumption

Identification and primary genetic analysis of Arabidopsis stomatal mutants in response to multiple stresses

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Chinese Science Bulletin 2006年第21期51卷 2586-2594页

作者： song Yuwei KANG Yanli LIU Hao ZHAO Xiaoliang WANG Pengtao AN Guoyong ZHOU Yun miao Chen song Chunpeng Laboratory of Plant Stress Biology Department of Biology Henan University Kaifeng 475001 China

In response to variable environmental conditions, guard cells located in the leaf epidermis can integrate and cope with a multitude of complicated stimuli, thereby making stomata in an appro- priate state. However, many signaling components in guard cell signaling remain elusive. In our laboratory, a tool for non-invasive remote infrared thermal images was used to screen an ethyl methane sulfonate-mutagenized population for Arabidopsis stomatal response mutants under multiple stresses (ABA, H2O2, CO2, etc.). More than forty "hot" or "cold" mutants were isolated (above or below 0.5℃ in con- trast to normal plantlets). Identification and primary genetic analysis of these mutants show that they are monogenic recessive mutations and there exist distinct difference in stomata apertures compared to wild type. These mutants in response to various environmental stresses and hormones were comprehen- sively investigated, which enables us to further un- derstand the cross-talk in different signal transduction pathways.

关键词：红外摄象机保卫细胞遗传分析信号转导变异

Prove the Minimal Delay of Complex Orthogonal Space-Time Block Code by Hadamard Matrix

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The Journal of China Universities of Posts and Telecommunications 2006年第1期13卷 25-28页

作者： ZHOU Li-gang SUN Dan-dan LI Xin miao Jian-song DING Wei Continuing Education School Beijing University of Posts and Telecommunications Beijing 100876 P.R. China School of Electronic Engineering Beijing University of Posts and Telecommunications Beijing 100876 P.R. China

The complex orthogonal designs with maximal rates and minimal delays is an open problem for space-time block code. Maximal rate can effectively transmit symbols to the lonest distance in the space dimension ; and minimal delay is the least decoding delay in the time dimension. Many authors have observed that regarding the complex orthogonal designs for space-time block codes with the antennas n = 4k （ k ∈ N ）, its minimal delay is the same as that for n - 4k -1. However none was able to prove it. In this paper, we use the characteristics of Hadamard matrix to prove this property to fulfill this vacancy.

关键词： complex orthogonal space-time block code hadamard matrix minimal delay maximal rate