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Layered virtual machine migration algorithm for network resource balancing in cloud computing

Frontiers of Computer Science 2018年第1期12卷 75-85页

作者： Xiong FU Juzhou CHEN Song DENG Junchang WANG Lin ZHANG School of Computer and Technology Nanjing University of Posts and Telecommunications Nanjing 210023 China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Nanjing 210023 China Institute of Advanced Technology Nanjing University of Posts and Telecommunications Nanjing 210023 China

Due to the increasing sizes of cloud data centers, the number of virtual machines （VMs） and applications rises quickly. The rapid growth of large scale Internet services re- suits in unbalanced load of network resource. The bandwidth utilization rate of some physical hosts is too high, and this causes network congestion. This paper presents a layered VM migration algorithm （LVMM）. At first, the algorithm will divide the cloud data center into several regions according to the bandwidth utilization rate of the hosts. Then we bal- ance the load of network resource of each region by VM migrations, and ultimately achieve the load balance of net- work resource in the cloud data center. Through simulation experiments in different environments, it is proved that the LVMM algorithm can effectively balance the load of network resource in cloud computing.

关键词： virtual machine migration cloud computing,layered theory load balancing

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Controlling Ion Conductance and Channels to Achieve Synapticlike Frequency Selectivity

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Nano-Micro Letters 2015年第2期7卷 121-126页

作者： Siheng Lu Fei Zeng Wenshuai Dong Ao Liu Xiaojun Li Jingting Luo Laboratory of Advanced Materials (MOE) School of Materials Science and Engineering Tsinghua University Institute of Thin Film Physics and Applications Shenzhen Key Laboratory of Sensor Technology Shenzhen University

Enhancing ion conductance and controlling transport pathway in organic electrolyte could be used to modulate ionic kinetics to handle signals. In a Pt/Poly(3-hexylthiophene-2,5-diyl)/Polyethylene?Li CF3SO3/Pt hetero-junction, the electrolyte layer handled at high temperature showed nano-fiber microstructures accompanied with greatly improved salt solubility. Ions with high mobility were confined in the nano-fibrous channels leading to the semiconducting polymer layer,which is favorable for modulating dynamic doping at the semiconducting polymer/electrolyte interface by pulse *** a device realized synaptic-like frequency selectivity, i.e., depression at low frequency stimulation but potentiation at high-frequency stimulation.

关键词： Ions migration Nano-channels Frequency selectivity Semiconducting polymer Organic electrolyte Dynamic doping

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Image correlation tool for ASTER geometric validation

Image correlation tool for ASTER geometric validation

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Conference on sensors, Systems and Next-Generation Satellites VI

作者： Iwasaki, A Fujisada, H National Institute of Advanced Industrial Science and Technology (Japan) Sensor Information Lab. Corp. (Japan)

ISBN: (纸本)0819446637

An image correlation tool, which can calculate co-variance of sub-images with an arbitrary window size, was developed. The tool has been applied to the evaluation of image quality of ASTER data products. It is found that line-of-sight vectors are registered correctly and the band-to-band registration is adjusted within 0.2 pixels. Thus the Leve-1 data products and the geometric data products of the higher order, i.e. Level-3 and Level-4, are validated. Further investigation of the image revealed the origin of the registration error. The SWIR sensor, which has six linear-array detectors arranged in parallel, is used for this analysis because the each line scan at the same ground target is carried out with time difference and is influenced by the variation of the platform attitude. It is found that the pointing fluctuation of the sensor system took place, which can not be corrected by the Level-1 processing because both the sampling time and the quatization of the satellite attitude information are not enough to eliminate the pointing fluctuation. By utilizing this configuration, the accurate image navigation may be possible in the future spacecraft. Other application to the DEM creation is also presented. where the accuracy of the DEM data obtained at the different time is investigated. We consider that the image correlation tool is promising for the remote sensing data analysis as well as the data correction.

关键词： ASTER geometric validation image matching and image navigation

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Polyvinyl chloride-reduced graphene oxide based chemiresistive sensor for sensitive detection of ammonia

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Journal of Materials Science: Materials in Electronics 2024年第3期35卷 1-18页

作者： Gaikwad, Sumita S. More, Mayuri S. Khune, Abhaysinh S. Mohammed, Hamed Y. Tsai, Meng-Lin Hianik, Tibor Shirsat, Mahendra D. RUSA Centre for Advanced Sensor Technology Department of Physics Dr Babasaheb Ambedkar Marathwada University MS Aurangabad431 004 India Department of Materials Science and Engineering National Taiwan University of Science and Technology Taipei10607 Taiwan Department of Nuclear Physics and Biophysics Faculty of Mathematics Physics and Informatics Comenius University Bratislava842 48 Slovakia

In this study, we present the innovative development of sensitive chemiresistive sensor utilizing a composite material composed of polyvinyl chloride (PVC) and reduced graphene oxide (rGO) for the highly responsive detection of ammonia (NH3) at ambient conditions. Graphene oxide (GO) was meticulously synthesized employing an enhanced version of Hummer’s method, and subsequently, rGO was prepared via thermal reduction from GO. The PVC/rGO composite was synthesized using a precise chemical pathway. The synthesized material was comprehensively characterized using advanced techniques including X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), UV–visible spectroscopy, Raman spectroscopy, atomic force microscopy (AFM), and I–V measurements, unveiling its structural, spectroscopic, morphological, and electrical attributes. The chemiresistive sensor was fabricated through the meticulous drop-casting of PVC/rGO composite onto an economical Cu interdigitated electrode (IDE) pattern. Remarkably, this PVC/rGO-based chemiresistive sensor exhibited superior performance in detecting corrosive NH3. The sensor demonstrated an exceptional response time of 46 s and a recovery time of 88 s, coupled with an impressively low detection limit of 1 ppm, surpassing the Occupational Safety and Health Administration (OSHA) permissible exposure limit (PEL). Notably, this sensor displayed a remarkable selectivity towards NH3 at ambient conditions, outperforming its response to other gases. Furthermore, the sensor exhibited outstanding reproducibility, repeatability, linearity, sensitivity, and stability in its response to NH3. This research showcases a groundbreaking advancement in the field of gas sensing technology, offering a highly sensitive and selective chemiresistive sensor for NH3 detection at room temperature (RT). The synergistic combination of PVC and rGO in the composite material, along with the precise fabrication techniques employed, has resulted in a sensor with u

关键词： Ammonia

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Polyvinylidene Difluoride/Sb2S3 Composite Film as a Potential Candidate for Piezoelectric Energy Generation

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Journal of The Institution of Engineers (India): Series D 2024年第1期105卷 147-153页

作者： Baral, Apurba Mukherjee, Nillohit School of Advanced Materials Green Energy and Sensor Systems Indian Institute of Engineering Science and Technology Shibpur Botanic Garden West Bengal Howrah711103 India

In this work, antimony sulphide (Sb2S3) in powder form was prepared using a simple chemical bath deposition technique by taking potassium antimonyl tartrate hemihydrate (K(SbO)C4H4O6), 0.5H2O) and sodium thiosulphate pentahydrate (Na2S2O3, 5H2O) as the source of Sb and S, respectively. The polymer, polyvinylidene difluoride (PVDF) was then impregnated by this chemically prepared Sb2S3 with varying wt% and PVDF/Sb2S3 composites were prepared in the form of films using solution casting method. Detailed structural/compositional characterization was carried out through x-ray diffraction, differential scanning calorimetry, Fourier transform infrared spectroscopy, field emission scanning electron microscopy, transmission electron microscopy and atomic force microscopy techniques with the synthesized materials. The PVDF/Sb2S3 composite films were also subjected to thorough electrical characterization that revealed excellent piezoelectric attributes. The voltage, current density and power output obtained from this composite film were highly impressive (~ 90 V, ~ 19 µA/cm2 and ~ 19,400 W/m3 across 1 MΩ load, respectively) making it worthy to use as a clean energy generator. The device was also utilized to charge a 2.2 µF-63 V capacitor up to ~ 40 V with simple finger patting. The results open up the avenue for utilizing this PVDF/Sb2S3 composite film in real life application as a clean energy generator. © The Institution of Engineers (India) 2023.

关键词： Sulfur compounds

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Efficient hydrolysis of coagulated porcine blood by a purified lumbrokinase from Eisenia fetida

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Food Bioscience 2025年 68卷

作者： Xin, Xuan Huang, Yuhua Zhang, Mengmeng Zou, Yucong Zeng, Liyan Fei, Yongtao Bai, Weidong Yang, Shanghua College of Light Industry and Food Technology Zhongkai University of Agriculture and Engineering Dongsha Street 24 Guangdong Guangzhou 510225 China College of Chemistry and Chemical Engineering Zhongkai University of Agriculture and Engineering Dongsha Street 24 Guangdong Guangzhou 510225 China School of Chemistry and Chemical Engineering Guangdong Provincial Key Laboratory of Optoelectronic Materials and Sensor Components Guangzhou Key Laboratory of Sensing Materials & Devices Centre for Advanced Analytical Science Guangzhou University Guangzhou 510006 China

Lumbrokinase, a serine protease with fibrinolytic activity in earthworms, is rarely used in food processing. To investigate the potential of lumbrokinase for hydrolyzing congealed porcine blood proteins, an electrophoretically pure lumbrokinase, L-C1, was isolated from E. fetida, which had a fibrinolytic activity of 85,312 U/mg, a molecular weight of 26 kDa, an optimal temperature range of 10–50 °C, and an optimal pH range of 5–11. The degree of hydrolysis, soluble peptide yield, and free amino acid content of the hydrolysates prepared by L-C1 were 43.30 %, 47.10 %, and 35.39 g/100 g, respectively. Moreover, the hydrolysates (1 mg/mL) had the highest ABTS, DPPH radical scavenging, and ACE inhibition rates of 77.85 %, 56.52 %, and 86.21 %, respectively. Results demonstrated that lumbrokinase hydrolyzed porcine blood proteins more efficiently than papain, alcalase, and bromelain, highlighting the potential application of its hydrolysates in functional foods. This study provides directions for the application of lumbrokinase in food processing and new enzymes for the hydrolysis of food proteins. © 2025 Elsevier Ltd

关键词： Active peptide Earthworm Enzymatic hydrolysis Enzyme Lumbrokinase Porcine blood

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Comparing the performance of the optical glucose assay based on glucose binding protein with high-performance anion-exchange chromatography with pulsed electrochemical detection: Efforts to design a low-cost point-of-care glucose sensor

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Journal of Diabetes Science and technology 2007年第6期1卷 864-872页

作者： Ge, Xudong Lam, Hung Modi, Swati J. Lacourse, William R. Rao, Govind Tolosa, Leah Center for Advanced Sensor Technology Department of Chemical and Biochemical Engineering University of Maryland Baltimore County Baltimore County MD 21250 1000 Hilltop Circle United States Department of Chemistry and Biochemistry University of Maryland Baltimore County Baltimore MD United States

Background: The glucose binding protein (GBP) is one of many soluble binding proteins found in the periplasmic space of gram-negative bacteria. These proteins are responsible for chemotactic responses and active transport of chemical species across the membrane. Upon ligand binding, binding proteins undergo a large conformational change, which is the basis for converting these proteins into optical biosensors. Methods: The GBP biosensor was prepared by attaching a polarity-sensitive fluorescent probe to a single cysteine mutation at a site on the protein that is allosterically responsive to glucose binding. The fluorescence response of the resulting sensor was validated against high-performance anion-exchange chromatography (HPAEC) with pulsed electrochemical detection. Finally, a simple fluorescence reader was built using a lifetime-assisted ratiometric technique. Results: The GBP assay has a linear range of quantification of 0.100-2.00 μM and a sensitivity of 0.164 μM^-1 under the specified experimental conditions. The comparison between GBP and HPAEC readings for nine blind samples indicates that there is no statistical difference between the analytical results of the two methods at the 95% confidence level. Although the methods of fluorescence detection are based on different principles, the response of the homemade device to glucose concentrations was comparable to the response of the larger and more expensive tabletop fluorescence spectrophotometer. Conclusions: A glucose binding protein labeled with a polarity-sensitive probe can be used for measuring micromolar amounts of glucose. Using a lifetime-assisted ratiometric technique, a low-cost GBP-based micromolar glucose monitor could be built. © Diabetes technology Society.

关键词： Binding protein Biosensor Diabetes Glucose monitor

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Software development of corneal endothelial cell analyzer 2

Software development of corneal endothelial cell analyzer

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2nd International Conference on Materials, Transportation and Environmental Engineering, CMTEE 2014

作者： Yu, Cheng Bo Dan, Xiao Ke, Yan Hong Yang, Yi Ju Lei, Liu Yuan, Yang Yu Chongqing University of Technology Chongqing China Time Grating Sensor and Advanced Detection Technology Key Laboratory Chongqing China

ISBN: (纸本)9783038352488

Based on the current development of corneal endothelial cells in the domestic, this paper developed corneal endothelial cell analyzer software system which taken Microsoft Visual Studio as development platform in Windows7 system and combined with MATLAB image processing technology and the Access database information management technology. The software relies on a database established patient archiving and query system, by VC + + statically call the dynamic link library that MATLAB Compiler generated to complete image processing, by partial equilibrium approach for image enhancement, by dynamic difference method for determination threshold when binaries. The software provides good interactive interface and graphics display surface, but also sets aside network port as follow-platform extension. © (2014) Trans Tech Publications, Switzerland.

关键词： Image enhancement

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Design and experiment of test system for simulating aero-engine burn fragments fault 2

Design and experiment of test system for simulating aero-eng...

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2nd International Conference on Frontiers of sensors Technologies, ICFST 2017

作者： Manguo, Huang Wei, Liu Defeng, Liu Yanshan, Wang Xin, Li Advanced Sensor Technology Center AVIC Beijing Changcheng Aeronautic Measurement and Control Technology Research Institute Beijing China Aviation Key Laboratory of Science and Technology On Special Condition Monitoring Sensor Technology Beijing China

ISBN: (纸本)9781509048601

The aero-engine gas path fault is the important aero-engine fault and has high frequency. This fault must be found timely and solved as early as possible to make sure the normal work of aero-engine and the safe flight of the airplane. The burn fragments fault is a common fault aero-engine gas path fault. The special aero-engine gas path fault simulation test system is necessary if we want to study the burn fragments fault efficiently and deeply. Based on the electrostatic monitoring technology, a kind of test system of aero-engine gas path fault was designed in this paper, and the burn fragments fault was simulated by the test system. Finally, the experiments for aero-engine gas path faults simulations were performed, and the effectiveness of simulation test system of aero-engine gas path fault was verified. © 2017 IEEE.

关键词： Electrostatics

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Development of Interdigitated Electrode Molecular Imprinted Polymer sensor for Monitoring Alpha Pinene Emissions from Mango Fruit

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Procedia Engineering 2013年 53卷 197-202页

作者： Huzein Fahmi Hawari Nurul Maisyarah Samsudin Ali Yeon Md Shakaff Supri.A. Ghani Mohd Noor Ahmad Yufridin Wahab Uda Hashim Centre of Excellence for Advanced Sensor Technology (CEASTech) University Malaysia Perlis Malaysia Institute Nanotechnology Electronic Engineering University Malaysia Perlis Malaysia

Alpha Pinene is a type of terpene hydrocarbons commonly emitted in substantial amounts by plants such as mango. Using Interdigitated Electrode (IDE) structure, a sensor for detecting Alpha Pinene volatile by using molecular imprinted polymer (MIP) was fabricated. The MIP membrane contained methacrylic acid, which formed specific cavities originated by target molecule. The use of Polyethylene Terephthalate (PET) as a substrate would allow a “low cost and flexible”sensor implementations. The IDE MIP sensor is capable to detect Alpha Pinene contained gas. The sensor characteristics were strongly influenced by the composition ratio of cross-linker, functional monomer and template molecule. The remained molecule on MIP can be removed by immersing thus the sensor can be used repeatedly. By determining Alpha Pinene volatile released during pre-matured until matured period, one could use this as a data point as potential non destructive solution to discriminate the mango ripeness stage hence improving the quality of harvest.

关键词： Electronic Nose Gas sensor Molecular Imprinted Polymer Interdigitated Electrode Alpha Pinene

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