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Multi-Source Adaptive Selection and Fusion for Pedestrian Dead Reckoning

IEEE/CAA Journal of Automatica Sinica 2022年第12期9卷 2174-2185页

作者： Yuanxun Zheng Qinghua Li Changhong Wang Xiaoguang Wang lifeng hu NORINCO GROUP Air Ammunition Research Institute Harbin 150030China the Research Center of Space Control and Inertial Technology Harbin Institute of TechnologyHarbin 150001China Research Center of Space Control and Inertial Technology Harbin Institute of TechnologyHarbin 150001China

Accurate multi-source fusion is based on the reliability, quantity, and fusion mode of the sources. The problem of selecting the optimal set for participating in the fusion process is nondeterministic-polynomial-time-hard and is neither sub-modular nor super-modular. Furthermore, in the case of the Kalman filter(KF) fusion algorithm, accurate statistical characteristics of noise are difficult to obtain, and this leads to an unsatisfactory fusion result. To settle the referred cases, a distributed and adaptive weighted fusion algorithm based on KF has been proposed in this paper. In this method, on the basis of the pseudo prior probability of the estimated state of each source, the reliability of the sources is evaluated and the optimal set is selected on a certain threshold. Experiments were performed on multi-source pedestrian dead reckoning for verifying the proposed algorithm. The results obtained from these experiments indicate that the optimal set can be selected accurately with minimal computation, and the fusion error is reduced by 16.6% as compared to the corresponding value resulting from the algorithm without *** proposed adaptive source reliability and fusion weight evaluation is effective against the varied-noise multi-source fusion system, and the fusion error caused by inaccurate statistical characteristics of the noise is reduced by the adaptive weight *** proposed algorithm exhibits good robustness, adaptability,and value on applications.

关键词： Adaptive reliability evaluation adaptive weight evaluation Kalman filter(KF) multi-source fusion optimal set selection

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Modeling of Isobutane/Butene Alkylation Using Solid Acid Catalysts in a Fixed Bed Reactor

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China Petroleum Processing & Petrochemical Technology 2016年第2期18卷 63-69页

作者： Liu Zheng Tang Xiaojin hu lifeng Hou Shuandi Research Institute of Petroleum Processing SINOPEC

A dynamic mass transfer model of isobutane/butene alkylation over solid acid catalysts in a fixed bed reactor was established. In the model, a modified equation for the relationship between point activity and effective diffusion coefficient was proposed. It is found that the simulation results fit the experimental data well and the breakthrough time of the bed layer is predicted accurately. By modeling the alkylation process, the time-space distribution of butene and point activity profiles of catalysts can be obtained. Furthermore, the reasons for the deactivation of solid acid catalysts were investigated. It indicates that the main reason for the deactivation of catalysts is the site coverage near the inlet of the reactor, while it is ascribed to the steric effect in the region far away from the inlet.

关键词： mass transfer model isobutane/butene alkylation fixed bed reactor deactivation internal diffusion

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Adaptive data-driven parallelization of multi-view video coding on multi-core processor

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Science in China(Series F) 2009年第2期52卷 195-205页

作者： PANG Yi hu WeiDong SUN lifeng YANG ShiQiang Department of Computer Science and Technology Tsinghua University Beijing 100084 China

Multi-view video coding （MVC） comprises rich 3D information and is widely used in new visual media, such as 3DTV and free viewpoint TV （FTV）. However, even with mainstream computer manufacturers migrating to multi-core processors, the huge computational requirement of MVC currently prohibits its wide use in consumer markets. In this paper, we demonstrate the design and implementation of the first parallel MVC system on Cell Broadband Engine^TM processor which is a state-of-the-art multi-core processor. We propose a task-dispatching algorithm which is adaptive data-driven on the frame level for MVC, and implement a parallel multi-view video decoder with modified H.264/AVC codec on real machine. This approach provides scalable speedup （up to 16 times on sixteen cores） through proper local store management, utilization of code locality and SIMD improvement. Decoding speed, speedup and utilization rate of cores are expressed in experimental results.

关键词： adaptive data-driven multi-view video coding Cell Broadband Engine^TM Processor parallelization

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Effects of nitrogen sources on MICP-related metabolic mechanism of Sporosarcina pasteurii and soil reinforcement

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JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING 2024年第12期16卷 5147-5161页

作者： Liu, Shiyu Ding, Xiaozhu Song, Peijian hu, lifeng hu, Zhou Yu, Jin Chang, Fangqiang huaqiao Univ Fujian Res Ctr Tunneling & Urban Underground Space Xiamen 361021 Peoples R China Nanchang Railway Tongda Ind & Trade Co Ltd Nanchang 330026 Peoples R China

Sporosarcina pasteurii (S. pasteurii) is widely used in microbial-induced carbonate precipitation (MICP) due to its high urease activity. In this paper, the effects of nutrients on the metabolic mechanism and mineralization ability of S. pasteurii were studied by comparing the bacteria's growth, gene expression, and mineralized sand column under different nitrogen sources. The results showed that urea and soy peptone replacing the inorganic and organic nitrogen sources in ammonium sulfate-yeast extract (NH4YE) medium can increase the urease activity of S. pasteurii by 11.43% and 17.10%, respectively. In the composite nitrogen source medium composed of urea and soy peptone, the urease activity of S. pasteurii increased by 25.30%. The transcriptome sequencing results showed that the modified medium of urea and soy peptone could promote the basic life activity and metabolism of S. pasteurii and is beneficial to urease expression. Among them, the gene difference between the modified urea medium and the primary medium was more obvious, and the urea medium could promote the ATP synthase related to urease expression and urea hydrolysis. The unconfined compressive strength (UCS) of sand columns reinforced with S. pasteurii cultured in Urea-YE, NH4-Soy peptone and Urea-Soy peptone increased by 27.6%, 36% and 58.1% respectively. The permeability decreased by 14.8%, 20.1% and 81.3% respectively compared with that of sand columns reinforced with S. pasteurii cultured in NH4-YE. The higher the urease activity of cultured bacteria, the more calcium carbonate produced after mineralization reaction. In addition, the urease activity of bacteria has an influence on the morphology of calcite crystals. This study can facilitate our understanding of optimizing the culture medium of S. pasteurii and the artificial regulation of urease activity in the process of MICP. (c) 2024 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Published by Elsevier B.V. This is an open acc

关键词： Soil reinforcement Microbial-induced carbonate precipitation Sporosarcina pasteurii Nitrogen sources Urease activity Transcriptome analysis

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Hydrodynamic Characteristics in an External Loop Airlift Slurry Reactor

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China Petroleum Processing & Petrochemical Technology 2016年第3期18卷 83-90页

作者： Bian Qing Tang Xiaojin hu lifeng Wang Shaobing Zhang Zhanzhu SINOPEC Research Institute of Petroleum Processing Beijing 100083 SINOPEC Qilu Branch Company Zibo 255400

Three different types of gas distributors were used in an external loop airlift slurry reactor to investigate the hydrodynamic characteristics. To predict the important hydrodynamic parameters, such as the total gas holdup, the slurry circulating velocity, the bubble size distribution, and the slip velocity between the gas phase and the slurry phase, the correlations are developed. The calculated results fit the experimental data very well. According to the influence of the solid holdup on the bubble size, the fluid flow in the reactor can be divided into two regimes, while a 10% value is regarded as the critical solid holdup value. When εs is≤10%, the bubble size is determined by both the gas phase and the slurry phase. When εs is ≥10%, the bubble size is determined mainly by the slurry phase. By analyzing the relationship between the slip velocity and the gas holdup, the bubble coalescence plays a key role in the slurry reactor.

关键词： hydrodynamics slurry bed bubble size distribution slip velocity

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Comparison of soil carbon dioxide emission between controlled and random traffic under conservation tillage

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International Journal of Agricultural and Biological Engineering 2009年第2期2卷 8-13页

作者： hu lifeng Li Hongwen Zhang Xuemin He Jin Department of Agricultural Engineering College of EngineeringChina Agricultural UniversityP.O.Box 46Beijing 100083China China Central Radio&TV University Beijing 100031China

Conservation tillage is proven to be a useful agricultural practice for reducing the concentration of CO_(2) released to the atmosphere,but there is currently only limited information regarding the influences of controlled traffic on soil CO_(2) ***,this study investigated the effects of controlled traffic on soil CO_(2) flux and on fuel consumption in winter wheat(Triticum aestivum L.)and maize(Zea mays L.)croplands of northern ***_(2) samples were collected from various compacted areas in the fields,including the crop zone,the inter-row zone and the traffic ***_(2) flux from the soil surface was measured with a GXH-3010E1 CO_(2) infrared analyzer during the crop grain filling ***_(2) fluxes were considerably larger for controlled traffic field(95.04±6.79)g/(m2·d)than that for random traffic field(50.91±7.57)g/(m2·d)in the crop zone,but there were no significant differences between random and controlled traffic fields in the inter-row *** contrast,in the traffic zone,all fluxes were lower than those in the other *** CO_(2) fluxes were not significantly different between controlled traffic and random traffic *** traffic can reduce fuel consumption by 9.7 L/hm2 compared to random traffic,which implies that it can also reduce the total annual amount of CO_(2) released from agricultural activities.

关键词： conservation tillage controlled traffic random traffic CO_(2)flux fuel consumption

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美国劳动法对雇主不当解雇行为的规制：源流、发展与反思

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环球法律评论 2009年第1期31卷 130-141页

作者：胡立峰厦门大学法学院民商法专业博士研究生

美国历史上秉持传统的雇佣自由原则,法律不干涉劳资双方因解雇发生的争议。自20世纪30年代起,美国开始通过制定法和司法判例引入对不当解雇的规制。但这种规制是不彻底的,既缺乏系统和完备的立法,司法过程中的态度也不统一。对不当解雇... 详细信息

美国历史上秉持传统的雇佣自由原则,法律不干涉劳资双方因解雇发生的争议。自20世纪30年代起,美国开始通过制定法和司法判例引入对不当解雇的规制。但这种规制是不彻底的,既缺乏系统和完备的立法,司法过程中的态度也不统一。对不当解雇的法律规制引发了美国社会的广泛争论,争论的焦点在于公平和效率在社会经济发展中何者优先保护。从美国劳资关系发展的现状来看,强调社会公平,对不当解雇进行法律规制是必要的。

关键词：劳资关系雇佣自由原则劳动法不当解雇

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赋权共原点灰色聚类的区域自然资源评价研究

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武汉大学学报（信息科学版） 2008年第2期33卷 164-167页

作者：林爱文牛继强胡立峰武汉大学资源与环境科学学院武汉市430079 武汉大学地理信息系统教育部重点实验室武汉市430079 信阳师范学院城市与环境科学系信阳市464000

提出了基于赋权共原点灰色聚类方法,该方法使用分段、共原点来计算聚类函数,对其进行合理的赋权后,以此来区别各聚类元素在其聚类指标下的所属类别,从而对区域自然资源进行评价,并选取湖北省进行了实例分析。

关键词：灰色聚类自然资源评价

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河北省典型缺水区适水型种植制度改革的讨论

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干旱地区农业研究 2019年第6期37卷 132-137页

作者：胡立峰张继宗张立峰国家开放大学农林医药教学部北京100039 河北农业大学农学院河北保定071001

基于河北省匮乏的水资源禀赋和严重超载的农田生产问题,讨论了轮作与休耕在缺水区应用的本质与意义,提出以农田雨养旱作、多作轮种与休耕为表征的缺水区简约化种植制度的改革原则。结合区域资源特征与国家需求,进一步实例分析了河北省... 详细信息

基于河北省匮乏的水资源禀赋和严重超载的农田生产问题,讨论了轮作与休耕在缺水区应用的本质与意义,提出以农田雨养旱作、多作轮种与休耕为表征的缺水区简约化种植制度的改革原则。结合区域资源特征与国家需求,进一步实例分析了河北省缺水区适水种植制度与技术策略,包括降低熟制,由冬小麦-夏玉米一年两熟降为春作物→冬小麦—夏作物两年三熟,实行冬春季的季节性休耕,缩减小麦比重,实现结构性节水;采用田间秸秆、塑膜覆盖以及土下覆膜技术,雨水集蓄、节水补灌技术,发展雨养农作;选择无限开花习性的棉花、花生、大豆、菜籽等一年生适水型作物,配合补水成苗等技术,促进作物稳产;以机械化与智能化替代人力生产等,提高农作效益;向优质型农产品转型、发展社会需求的休闲游憩型环境产品生产,实现对高耗水生产的等效或优效替代。

关键词：休耕轮作种植制度雨养农作田间覆盖集水节水技术作物类型河北省缺水区

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中国保护性耕作试验研究的产量效应

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东北农业科学 2020年第4期45卷 40-44页

作者：胡立峰国家开放大学农林医药教学部北京100039

为探究中国保护性耕作研究的产量效应及区域分布情况,收集自2006年至2019年3月公开发表的涉及保护性耕作的研究论文,对田间试验条件下具有明显产量效应的期刊论文进行整理分析。研究发现,在全部产量研究的结果中,增产、平产、减产的研... 详细信息

为探究中国保护性耕作研究的产量效应及区域分布情况,收集自2006年至2019年3月公开发表的涉及保护性耕作的研究论文,对田间试验条件下具有明显产量效应的期刊论文进行整理分析。研究发现,在全部产量研究的结果中,增产、平产、减产的研究结果所占比例分别约为60.96%、24.32%和14.72%。保护性耕作产量效应的区域特色表现在东北地区实施保护性耕作产量研究结果多为增产,增产结果约占77%;而平产和减产的研究结果在黄淮海、华北平原较多,分别约为32%和22%。在保护性耕作产量研究的试验中,秸秆处理措施研究占全部研究的60%以上,少免耕研究相对较少,且免耕是减产研究结果中占比最多的保护性耕作措施。小麦、玉米、水稻仍然是保护性耕作主要的研究对象,78%以上的研究集中在这三种作物上。随着生态环境日益受到重视,越来越多的作物将成为保护性耕作的研究对象。

关键词：保护性耕作产量效应秸秆处理少免耕

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