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An intelligent active probing and trace-back scheme for IoT anomaly detection

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Digital Communications and Networks 2024年第1期10卷 168-181页

作者： Luying Wang Lingyi Chen Neal N.Xiong Anfeng Liu Tian Wang Mianxiong Dong School of Computer Science and Engineering Central South UniversityChangsha 410083China Department of Computer Science and Mathematics Sul Ross State UniversityAlpineTX 79830USA Artificial Intelligence and Future Networks Beijing Normal University&UICZhuhai 519087China Department of Information and Electronic Engineering Muroran Institute of TechnologyMuroran 050-8585Japan

Due to their simple hardware,sensor nodes in IoT are vulnerable to attack,leading to data routing blockages or malicious tampering,which significantly disrupts secure data *** Intelligent Active Probing and Trace-back Scheme for IoT Anomaly Detection(APTAD)is proposed to collect integrated IoT data by recruiting Mobile Edge Users(MEUs).(a)An intelligent unsupervised learning approach is used to identify anomalous data from the collected data by MEUs and help to identify anomalous nodes.(b)Recruit MEUs to trace back and propose a series of trust calculation methods to determine the trust of nodes.(c)The last,the number of active detection packets and detection paths are designed,so as to accurately identify the trust of nodes in IoT at the minimum cost of the network.A large number of experimental results show that the recruiting cost and average anomaly detection time are reduced by 6.5 times and 34.33%respectively,while the accuracy of trust identification is improved by 20%.

关键词： Anomaly detection Internet of things Integrating data collection Mobile edge users Intelligent

Swimmer with submerged SiO_(2)/Al/LiNbO_(3) surface acoustic wave propulsion system

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Biomimetic Intelligence & Robotics 2024年第2期4卷 71-77页

作者： Deqing Kong Ryo Tanimura Fang Wang Kailiang Zhang Minoru Kuribayashi Kurosawa Manabu Aoyagi Department of Engineering Muroran Institute of TechnologyMuroran 050-8585Japan Tianjin Key Laboratory of Film Electronic and Communication Devices School of Integrated Circuit Science and EngineeringTianjin University of TechnologyTianjin 300384China School of Engineering Tokyo Institute of TechnologyYokohama 226-8501Japan

Acoustic propulsion system presents a novel underwater propulsion approach in small scale *** study introduces a submerged surface acoustic wave(SAW)propulsion system based on the SiO_(2)/Al/LiNbO_(3) *** 19.25 MHz,the SAW propulsion system is proposed and investigated by the propulsion force calculation,PIV measurements and propulsion measurements.3.3 mN propulsion force is measured at 27.6 V_(pp).To evaluate the miniature swimmer,the SAW propulsion systems with multiple frequencies are *** 2.2 W,the submerged SAW propulsion system at 38.45 MHz demonstrates 0.83 mN/mm^(2) propulsion *** 96.13 MHz and 24 V_(pp),the movements of miniature swimmer with a fully submerged SAW propulsion system are recorded and analyzed to a maximum of 177 mm/*** of miniaturization,high power density,and simple structure,the SAW propulsion system can be expected for some microrobot applications,such as underwater drone,pipelinerobotand intravascularrobot.

关键词： Acoustofluidics Surface acoustic wave Swimmer Underwater propulsion system

Effect of Ultrasonic Output Power on Refining the Crystal Structures of Ingots and Its Experimental Simulation

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Journal of Materials Science & Technology 2005年第1期21卷 47-52页

作者： dunwenLI TadashiMOMONO DepartmentofMaterialsScienceandEngineering LiaoningInstituteofTechnologyJinzhou121001China//GraduateSchoolMuroranInstituteofTechnologyMuroran050-8585Japan FacultyofEngineering MuroranInstituteofTechnologyMuroran050-8585Japan

In this study, a series of tests were conducted by using aluminum-based alloy to determine the formation of grain refining structure based on the ultrasonic vibration (UV). Furthermore, the simulation test and effect of ultrasonic output power were studied using ammonium chloride. Finally, the mechanism of grain refinement was investigated. The results show that: (1) By applying the UV to aluminum-base alloy, the grain refining rate of ingots tended to increase with the increase of the output value of UV. (2) It was confirmed that time from after the pour to the beginning of crystallization as well as cloudiness tended to decrease with increasing the ultrasonic power value of UV. Moreover, it can be seen from each cooling curve that a uniform temperature gradient existed in the melt as the power of UV increased, that made the melt strongly stirred. (3) It was also considered that the grain refining effect of ingots, which was observed from the simulation tests, resulted from nucleation action and stirring division action by applying the UV.

关键词： Aluminum alloy Grain refining Ultrasonic vibration Simulation

祁白芷UPLC指纹图谱的建立及其抗氧化谱效关系研究

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中国药学杂志 2024年第10期59卷 896-903页

作者：段天华徐荣荣李蕊张泽昭姜晓娅刘思琪刘宸男王鑫国冯薇河北中医药大学药学院河北省中药配方颗粒技术创新中心中药材品质评价与标准化河北省工程研究中心石家庄050

目的建立祁白芷超高效液相色谱(UPLC)指纹图谱,采用超高效液相色谱-四极杆-飞行时间质谱(UPLC-Q-TOF-MS)对共有峰进行成分鉴定,测定各批次祁白芷抗氧化活性,并探讨祁白芷的化学成分与抗氧化活性的谱效关系。方法采用《中药色谱指纹图谱... 详细信息

目的建立祁白芷超高效液相色谱(UPLC)指纹图谱,采用超高效液相色谱-四极杆-飞行时间质谱(UPLC-Q-TOF-MS)对共有峰进行成分鉴定,测定各批次祁白芷抗氧化活性,并探讨祁白芷的化学成分与抗氧化活性的谱效关系。方法采用《中药色谱指纹图谱相似度评价系统(2012版)》建立28批祁白芷的指纹图谱,确认共有峰并进行相似度评价,并对共有峰进行UPLC-Q-TOF-MS分析。以1,1-二苯基-2-三硝基苯肼(DPPH)自由基清除率为抗氧化指标,测定其抗氧化活性。采用灰色关联度和偏最小二乘回归分析祁白芷共有峰与抗氧化活性的谱效关系。结果建立了28批祁白芷药材的指纹图谱,其相似度为0.910~0.997。聚类分析可将不同加工方式的祁白芷分为熏硫和无硫两大类,当平方欧氏距离为10时,可将无硫祁白芷进一步分为两类,与商品规格等级分类相符。其共标定13个共有峰,利用对照品对比和UPLC-Q-TOF-MS解析指认出共有峰分别为奎宁酸、二氢山芹醇、水合氧化前胡素、白当归素、花椒毒素、佛手柑内酯、异茴芹内酯、氧化前胡素、欧前胡素、珊瑚菜素、8-氧甲基异欧前胡内酯、异欧前胡素、镰叶芹酮。通过清除DPPH自由基实验发现,28批祁白芷均有抗氧化能力,谱效分析结果显示,奎宁酸、佛手柑内酯、氧化前胡素、珊瑚菜素、异欧前胡素、镰叶芹酮等与抗氧化能力呈正相关。结论本研究建立了基于化学成分和抗氧化活性的祁白芷质量评价模式,为阐明祁白芷药材中抗氧化活性成分及质量控制提供参考。

关键词：祁白芷超高效液相色谱-四极杆-飞行时间质谱指纹图谱抗氧化谱效关系

Is magnesium deficiency the major cause of needle chlorosis of Pinus taeda in Brazil?

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Journal of Forestry Research 2024年第2期35卷 209-221页

作者： Antônio Carlos Vargas Motta Shizuo Maeda Valdécio dos Santos dos Santos Rodrigues Tamires Maiara Ercole Stephen Arthur Prior Ana Elisa Lyra Brumat Amanda Pacheco Cardoso Moura Julierme Zimmer Barbosa João Bosco Vasconcellos Gomes Department of Soil Sciences and Agriculture Engineering Federal University of ParanáR.dos Funcionários1540.CuritibaParanáCEP 80035‑050Brazil Brazilian Agricultural Research Company Embrapa FlorestasEstr.da Ribeira–Br‑476Km 111–Parque Monte Castelo.ColomboParanáCEP 83411‑000Brazil United States Department of Agriculture‑Agricultural Research Service USDA-ARS National Soil Dynamics Laboratory411 South Donahue DriveAuburnAL 36832USA Reforestation Remasa Rodovia PR 170–Km 522.BiturunaParanáCEP 84640‑000Brazil Federal Institute of Southeast of Minas Gerais R.Luz Interior360.Juiz de ForaMinas Gerais CEP 36030‑713Brazil

Needle chlorosis(NC)in Pinus taeda *** in Brazil becomes more frequent after second and third harvest rotation *** a study to identify factors contributing to yellowing needle chorosis(YNC),trees were grown in soils originating from contrasting parent materials,and soils and needles(whole,green and chlorotic portions)from 1-and 2-year-old branches and the first and second needle flush release at four sites with YNC on *** were analyzed for various elements and *** soils had very low base levels(Ca^(2+),Mg^(2+)and K^(+))and P,suggesting a possible lack of multiple *** symptoms started at needle tips,then extended toward the needle base with *** flush needles had longer portions with YNC than second flush needles *** from the lower crown also had more symptoms along their length than those higher in the *** were similar to those reported for *** chlorotic portions,Mg and Ca concentrations were well below critical values;in particular,Mg levels were only one third of the critical value of 0.3 g kg^(-1).Collectively,results suggest that Mg deficiency is the primary reason for NC of *** in various parent soils in Brazil.

关键词： Nutritional deficiency Forest management Soil depletion Pine foliar analysis Needle chlorosis

Applying a Context-based Method to Build a Knowledge Graph for the Blue Amazon

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Data Intelligence 2024年第1期6卷 64-103页

作者： Pedro de Moraes Ligabue Anarosa Alves Franco Brandão Sarajane Marques Peres Fabio Gagliardi Cozman Paulo Pirozelli Escola Politécnica Universidade de São PauloRua Visconde da Luz60São PauloSão Paulo 05508-010Brazi Escola Politécnica Universidade de São PauloAv.Prof.Luciano Gualbertotv 3158São Paulo 05508-010Brazil Escola de Artes Ciências e Humanidades Universidade de São PauloRua Arlindo Béttio1000São Paulo 03828-000Brazil Instituto de Estudos Avançados Universidade de São PauloRua da Praça do Relógio109São Paulo 05508-050Brazil

Knowledge graphs are employed in several tasks,such as question answering and recommendation systems,due to their ability to represent relationships between *** constructing such a graphs,however,remains an unresolved challenge within knowledge *** tackle this challenge,we propose CtxKG,a method specifically aimed at extracting knowledge graphs in a context of limited resources in which the only input is a set of unstructured text *** is based on OpenIE(a relationship triple extraction method)and BERT(a language model)and contains four stages:the extraction of relationship triples directly from text;the identification of synonyms across triples;the merging of similar entities;and the building of bridges between knowledge graphs of different *** method distinguishes itself from those in the current literature(i)through its use of the parse tree to avoid the overlapping entities produced by base implementations of OpenIE;and(ii)through its bridges,which create a connected network of graphs,overcoming a limitation similar methods have of one isolated graph per *** compare our method to two others by generating graphs for movie articles from Wikipedia and contrasting them with benchmark graphs built from the OMDb movie *** results suggest that our method is able to improve multiple aspects of knowledge graph *** also highlight the critical role that triple identification and named-entity recognition have in improving the quality of automatically generated graphs,suggesting future paths for ***,we apply CtxKG to build BlabKG,a knowledge graph for the Blue Amazon,and discuss possible improvements.

关键词： knowledge graph word embeddings relationship triple extraction Blue Amazon Atlantic Ocean Brazilian coast

Effect of Graphite Nodule Diameter on Water Embrittlement of Austempered Ductile Iron

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Journal of Iron and Steel Research International 2005年第3期12卷 40-45页

作者： CAIQi-zhou WEIBo-kang TANAKAYuichi HuazhongUniversityofScienceandTechnology Wuhan430074China MuroranInstituteofTechnology Muroran050-8585Japan

Effects of graphite nodule diameter on the water embrittlement of austempered ductile iron (ADI) is studied. The water embrittlement mechanism is discussed. Due to water adhesion, local embrittlement occurs on the surface of ADI specimen, resulting in early fracture and significant reduction in tensile strength and elongation. The water embrittlement is the cracking of stress induced martensite formed during tensile deformation caused by hydrogen diffusion decomposed from water and as a result tensile strength and elongation of ADI are remarkably reduced. The segregation of alloying elements in ductile iron is weakened with decreasing nodule diameter, reducing the residual austenite in grain boundaries, then decreasing the amount of stress induced martensite during tensile plastic deformation and finally restraining ADI water embrittlement.

关键词： austempered ductile iron water embritttlement graphite nodule diameter tensile property

Overspeeding characteristics of turbomachinery for gas generator cycle air turbo ramjet engine

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Propulsion and Power Research 2022年第4期11卷 444-456页

作者： Ryojiro Minato Daisuke Nakata Masaharu Uchiumi Ryoji Imai Kazuyuki Higashino Department of Engineering Muroran Institute of Technology MuroranHokkaido050-8585Japan Aerospace Plane Research Center Muroran Institute of Technology MuroranHokkaido050-8585Japan

The main interest in the current study focuses on the possibility of overspeeding for the gas-generator cycle air turbo ramjet(GG-ATR)*** authors developed the air turbo ramjet engine and investigated its compressor *** on those data,the authors developed the analytical code for the air turbo ramjet engine,which calculates the performances of turbomachinery,gas-generator,and ram *** previous study described that the rotor overspeeding would not occur in the air turbo rocket ***,the current results show that degraded ram combustion can decrease the compressor pressure ratio and the compressor *** reduced compressor power can cause overspeeding for the air turbo ramjet *** experimental results of compressor power and turbine inlet pressure support those analytical results.

关键词： Air turbo ramjet engine Compressor map Overspeeding Combustion efficiency

Low toxic nitromethane based monopropellant for gas generator cycle air turbo ramjet engine

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Propulsion and Power Research 2022年第3期11卷 311-324页

作者： Ryojiro Minato Department of Engineering Muroran Institute of TechnologyMuroranHokkaido050-8585Japan

The present study proposes ethanol-nitromethane mixture as a safe, storable, andlow toxic monopropellant for a gas generator cycle air turbo ramjet engine and evaluates itspropulsion performance. The present study proposes that nitromethane is mixed with ethanolto adjust gas generator combustion temperature. The author developed the computational codefor the present analysis and verified its accuracy. The specific thrust of ethanol-nitromethane isnearly identical to that of ethanol-liquified oxygen and is higher than methanol-hydroxylammonium nitrate aqueous solution and hydrazine. Hydrazine has the highest Ispamong the propellants in the present analysis. However, Isp of ethanol-nitromethane is nearlyequal to that of ethanol-liquified oxygen and higher than those of methanol-hydroxylammonium nitrate aqueous solution, and hydroxyl terminated polybutadiene-ammonium perchlorate. With the propellant-to-air ratio range in the present study, ethanol-nitromethane has the stoichiometric condition at the ram combustor around the propellant-to-air ratio range from 0.2 to 0.25 and can obtain high ram combustion temperature. This resultis favorable for ethanol-nitromethane because it improves the specific thrust and the specificimpulse. Therefore, ethanol-nitromethane can be a promising low-toxic liquid monopropellantfor the air turbo ramjet engine.

关键词： Air turbo ramjet Monopropellant Nitromethane Low toxicity Ethanol