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An Efficient and Privacy-Preserving Data Aggregation Scheme Supporting Arbitrary Statistical Functions in IoT

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China Communications 2022年第6期19卷 91-104页

作者： Haihui Liu Jianwei Chen liwei lin Ayong Ye Chuan Huang College of Computer and Cyber Security Fujian Normal UniversityFuzhou 350117China Fujian Provincial Key Laboratory of Network Security and Cryptology Fujian Normal UniversityFuzhou 350117China School of Computer Science and Mathematics Fujian University of TechnologyFuzhou 350118China Digital Fujian Institute of Big Data Security Technology Fujian Normal UniversityFuzhou 350117China

The Internet of Things(IoT)has profoundly impacted our lives and has greatly revolutionized our *** terminal devices in an IoT data aggregation application sense real-time data for the remote cloud server to achieve intelligent ***,the high frequency of collecting user data will raise people concerns about personal *** recent years,many privacy-preserving data aggregation schemes have been ***,most existing schemes cannot support either arbitrary aggregation functions,or dynamic user group management,or fault *** this paper,we propose an efficient and privacy-preserving data aggregation *** the scheme,we design a lightweight encryption method to protect the user privacy by using a ring topology and a random location *** this basis,the proposed scheme supports not only arbitrary aggregation functions,but also flexible dynamic user ***,the scheme achieves faulttolerant capabilities by utilizing a future data buffering *** analysis reveals that the scheme can achieve the desired security properties,and experimental evaluation results show the scheme's efficiency in terms of computational and communication overhead.

关键词： Internet of Things data aggregation privacy protection arbitrary aggregation functions

Online traffic-aware linked VM placement in cloud data centers

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Science China(Information Sciences) 2020年第7期63卷 182-204页

作者： liwei lin David S.L.WEI Ruhui MA Jian LI Haibing GUAN Shanghai Key Laboratory of Scalable Computing and Systems Shanghai Jiao Tong University Department of Computer & Information Sciences Fordham University

In cloud computing, virtual machine(VM) placement plays a crucial role in data center(DC)management, as different ways of VM placement may require different system resources. As Cisco research reveals that virtualization of DC increases traffic within the DC and causes network bandwidth to become scarce resource, recent researches have been focusing on traffic-aware VM placement. However, previous traffic-aware VM placement schemes treat the VM placement as a static process in that they do not take into account the impact of the current placement decision on the subsequent placement. In this paper,we thus propose a novel online traffic-aware VM placement scheme. Our scheme views VM placement as a context-sensitive dynamic process in that the decision of every step of the placement is made aiming at helping the subsequent steps of placement to reduce the required network bandwidth in the long run. In our scheme, we consider not only inter-VM traffic but also the bandwidth constraint of a physical machine(PM) when making a VM placement decision. To realize our objective, we put those VMs with close end time in the same or close proximity PMs so that when the VMs are terminated, one can make enough room for the future arrivals so as to not only minimize the number of active PMs but also reduce networking costs. We conduct extensive simulations to verify the superiority of our scheme in terms of networking costs and energy consumption. Simulation results show that our scheme outperforms improved-best-fit-decreasing(IBFD) scheme, a revised best-fit version that takes inter-VM traffic into account, by 30%–40% on network cost under various scenarios. Our scheme also promises 10%–25% power savings compared with IBFD.

关键词： linked VMs traffic-aware online VM placement cloud data center energy efficient

Transformation of 1-D Chiral-chained Titanium Phosphate to 2-D Layer Structure Through a 1-D Zigzag Chain

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Chemical Research in Chinese Universities 2005年第4期21卷 411-414页

作者： CHENChao YANGYu-lin liwei-sheng LIUYun-ling YIZhuo GUOYang-hong PANGWen-qin StateKeyLaboratoryofInorganicSynthesisandPreparativeChemistry CollegeofChemistryJilinUniversityChangchun130012P.R.China

The transformation of titanium phosphate from 1-D chiral- chain(JTP-A) to 2-D layer(TP-J1) has been carefully investigated. Through a hydrolysis-condensation self-assembly pathway, the crystals of TP-J1 can be obtained from the JTP-A phase under hydrothermal conditions. An intermediate material with zigzag chain during the transformation was observed by XRD characterization. A hypothesis of the transformation mechanism is also described in this article. It is noteworthy that ethylenediamine plays an important role in the transformation.

关键词： Transformation Titanium phosphate Mechanism Rational design

3D-printed microelectronics for integrated circuitry and passive wireless sensors

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Microsystems & Nanoengineering 2015年第1期1卷 119-127页

作者： Sung-Yueh Wu Chen Yang Wensyang Hsu liwei lin Department of Mechanical Engineering University of CaliforniaBerkeleyCA 94720USA Department of Mechanical Engineering National Chiao Tung UniversityHsinchu 30010 Berkeley Sensor and Actuator Center(BSAC) University of CaliforniaBerkeleyCA 94720USA

Three-dimensional(3D)additive manufacturing techniques have been utilized to make 3D electrical components,such as resistors,capacitors,and inductors,as well as circuits and passive wireless *** the fused deposition modeling technology and a multiple-nozzle system with a printing resolution of 30μm,3D structures with both supporting and sacrificial structures are *** removing the sacrificial materials,suspensions with silver particles are injected subsequently solidified to form metallic elements/*** prototype results show good characteristics of fabricated 3D microelectronics components,including an inductor–capacitor-resonant tank circuitry with a resonance frequency at 0.53 GHz.A 3D“smart cap”with an embedded inductor–capacitor tank as the wireless passive sensor was demonstrated to monitor the quality of liquid food(e.g.,milk and juice)*** result shows a 4.3%resonance frequency shift from milk stored in the room temperature environment for 36 *** work establishes an innovative approach to construct arbitrary 3D systems with embedded electrical structures as integrated circuitry for various applications,including the demonstrated passive wireless sensors.

关键词： additive manufacturing radio-frequency passive sensors 3D inductors and capacitors three-dimensional printing wireless sensing

Deep learning for non-parameterized MEMS structural design

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Microsystems & Nanoengineering 2022年第4期8卷 251-260页

作者： Ruiqi Guo Fanping Sui Wei Yue Zekai Wang Sedat Pala Kunying Li Renxiao Xu liwei lin Department of Mechanical Engineering University of CaliforniaBerkeleyCA 94720USA School of Computer Science Wuhan UniversityWuhan 430072China Department of Engineering Mechanics Tsinghua UniversityBeijing 100084China

The geometric designs of MEMS devices can profoundly impact their physical properties and eventual ***,it is challenging for researchers to rationally consider a large number of possible designs,as it would be very time-and resource-consuming to study all these cases using numerical *** this paper,we report the use of deep learning techniques to accelerate the MEMS design cycle by quickly and accurately predicting the physical properties of numerous design candidates with vastly different geometric *** candidates are represented in a nonparameterized,topologically unconstrained form using pixelated black-and-white *** sufficient training,a deep neural network can quickly calculate the physical properties of interest with good accuracy without using conventional numerical tools such as finite element *** an example,we apply our deep learning approach in the prediction of the modal frequency and quality factor of disk-shaped microscale *** reasonable training,our deep learning neural network becomes a high-speed,high-accuracy calculator:it can identify the flexural mode frequency and the quality factor 4.6×10^(3)times and 2.6×10^(4)times faster,respectively,than conventional numerical simulation packages,with good accuracies of 98.8±1.6%and 96.8±3.1%,*** simultaneously predicting the frequency and the quality factor,up to~96.0%of the total computation time can be saved during the design *** proposed technique can rapidly screen over thousands of design candidates and promotes experience-free and data-driven MEMS structural designs.

关键词： structural Deep faster

Wafer-scale graphene on 2 inch SiC with uniform structural and electrical characteristics

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Chinese Science Bulletin 2012年第23期57卷 3022-3025页

作者： JIA YuPing GUO liwei lin JingJing CHEN LianLian CHEN XiaoLong Research & Development Center for Functional Crystals Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences Beijing 100190 China

Wafer-scale graphene on SiC with uniform structural and electrical features is needed to realize graphene-based radio frequency devices and integrated ***,a continuous bi/trilayer of graphene with uniform structural and electrical features was grown on 2 inch 6H-SiC (0001) by etching before and after graphene *** and atomic force microscopy images indicate the surface morphology of graphene is uniform over the 2 inch *** and transmittance spectra confirmed that its layer number was also *** resistance measurements indicated the average graphene sheet resistance was 720 /with a non-uniformity of 7.2%.Large area contactless mobility measurements gave a carrier mobility of about 450 cm2 /(V s) with an electron concentration of about 1.5×10 13 *** our knowledge,such homogeneous morphology and resistance on wafer scale are among the best results reported for wafer-scale graphene on SiC.

关键词： graphene wafer scale resistivity mobility morphology

Electron delocalization enhances the thermoelectric performance of misfit layer compound(Sn_(1-x)Bi_(x)S)_(1.2)(TiS_(2))_(2)

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Chinese Physics B 2022年第11期31卷 82-88页

作者： Xin Zhao Xuanwei Zhao liwei lin Ding Ren Bo Liu Ran Ang Key Laboratory of Radiation Physics and Technology Ministry of EducationInstitute of Nuclear Science and TechnologySichuan UniversityChengdu 610064China Institute of New Energy and Low-Carbon Technology Sichuan UniversityChengdu 610065China

The misfit layer compound(SnS)_(1.2)(TiS_(2))_(2)is a promising low-cost thermoelectric material because of its low thermal conductivity derived from the superlattice-like ***,the strong covalent bonds within each constituent layer highly localize the electrons thereby it is highly challenging to optimize the power factor by doping or ***,we show that Bi doping at the Sn site markedly breaks the covalent bonds networks and highly delocalizes the *** results in a high charge carrier concentration and enhanced power factor throughout the whole temperature *** is highly remarkable that Bi doping also significantly reduces the thermal conductivity by suppressing the heat conduction carried by phonons,indicating that it independently modulates phonon and charge transport *** effects collectively give rise to a maximum ZT of 0.3 at 720 *** addition,we apply the single Kane band model and the Debye–Callaway model to clarify the electron and phonon transport mechanisms in the misfit layer compound(SnS)_(1.2)(TiS_(2))_(2).

关键词： misfit layer sulfide electron delocalization carrier mobility chemical bond

Study of a water-soluble supramolecular complex of curcumin andβ-cyclodextrin polymer with electrochemical property and potential anti-cancer activity

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Chinese Chemical Letters 2022年第8期33卷 4043-4047页

作者： Wang Zhang Ping Xiao liwei lin Fang Guo Qingyue Wang Yuanzhe Piao Guowang Diao School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002China Department of Applied Bioengineering Graduate School of Convergence Science and TechnologySeoul National UniversitySuwon 443-270Republic of Korea Shanghai Suni Biotechnology Development Co. Ltd.Shanghai 201300China Advanced Institutes of Convergence Technology Suwon 443-270Republic of Korea

As a member of the curcuminoid compound family,curcumin(Cur)has many interesting therapeutic ***,its low aqueous solubility and stability have resulted in poor bioavailability and restricted clinical *** on size matching,β-cyclodextrin polymer(β-CDP),with its hydrophilic polymer chains and hydrophobic cavities,can form an inclusion complex with *** improve the water solubility and stability of Cur,a simple and eco-friendly grinding method was designed to formβ-CDP inclusion *** to the Boltzmann-Hamel's method and Job's method,the molar ratio of theβ-CD unit inβ-CDP to Cur was determined to be 1:*** diffusion coefficient and diffusion activation energy of Cur-β-CDP were calculated in an electrochemical *** supramolecular complex worked well in vitro to inhibit the proliferation of hepatoma carcinoma cells ***,this method visibly reduced the undesirable side effects on normal cells,without weakening the anti-cancer activity of the *** expect that the obtained host-guest complex will provide a new approach for delivering natural drug molecules,having low water solubility.

关键词： Cyclodextrin polymer Curcumin Solubility Anti-cancer activity Supramolecular complex

Electrohydrodynamic 3D printing of orderly carbon/nickel composite network as supercapacitor electrodes

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Journal of Materials Science & Technology 2021年第23期82卷 135-143页

作者： Bing Zhang Jiankang He Gaofeng Zheng Yuanyuan Huang Chaohung Wang Peisheng He Fanping Sui lingchao Meng liwei lin Department of Mechanical Engineering Berkeley Sensors and Actuator CenterUniversity of California BerkeleyBerkeleyCA 94720United States State Key Laboratory for Manufacturing Systems Engineering Xi’an Jiaotong UniversityXi’an710049China

Electrohydrodynamic(EHD)3D printing of ca rbon-based materials in the form of orderly networks can have various *** this work,microscale carbon/nickel(C-Ni)composite electrodes with controlled porosity have been utilized in electrochemical energy storage of ***(PAN)was chosen as the basic material for its excellent carbonization performance and EHD printing *** nitrate(Ni(NO_(3))_(2))was incorporated to form Ni nanoparticles which can improve the conductivity and the capacitance performance of the ***-aligned PAN-Ni(NO_(3))_(2) composite structures have been fabricated and carbonized as C-Ni electrodes with the typical diameter of 9.2±2.1μ*** porosity of the as-prepared C-Ni electrode can be controlled during the EHD *** results show the C-Ni network electrode has achieved a 2.3 times higher areal specific capacitance and 1.7 times higher mass specific capacitance than those of a spin-coated *** such,this process offers a facile and scalable strategy for the fabrication of orderly carbon-based conductive structures for various applications such as energy storage devices and printable electronics.

关键词： Electrohydrodynamic 3D printing Carbon-nickel structure Controlled porosity Supercapacitors