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Feature Selection to Mine Joint Features from High-dimension Space for Android Malware Detection
( Yanping Xu ),( Chunhua Wu ),( Kangfeng Zheng ),( Xinxin Niu ),( Tianling Lu ) 한국인터넷정보학회 2017 KSII Transactions on Internet and Information Syst Vol.11 No.9
Android is now the most popular smartphone platform and remains rapid growth. There are huge number of sensitive privacy information stored in Android devices. Kinds of methods have been proposed to detect Android malicious applications and protect the privacy information. In this work, we focus on extracting the fine-grained features to maximize the information of Android malware detection, and selecting the least joint features to minimize the number of features. Firstly, permissions and APIs, not only from Android permissions and SDK APIs but also from the developer-defined permissions and third-party library APIs, are extracted as features from the decompiled source codes. Secondly, feature selection methods, including information gain (IG), regularization and particle swarm optimization (PSO) algorithms, are used to analyze and utilize the correlation between the features to eliminate the redundant data, reduce the feature dimension and mine the useful joint features. Furthermore, regularization and PSO are integrated to create a new joint feature mining method. Experiment results show that the joint feature mining method can utilize the advantages of regularization and PSO, and ensure good performance and efficiency for Android malware detection.
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Yongfeng Gao,Yuanhui Feng,Lu Zhou,Lucia Petti,Zhe Wang,Jun Zhou,Shusen Xie,Jian Chen,Yanping Qing 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.1
Ultrasensitive detection of alpha-fetoprotein (AFP) is critical for the early diagnosis of liver cancer. In this work, a novel surface-enhanced Raman scattering (SERS)-based immunoassay complex has been successfully developed for the detection of AFP by using the Au-Ag alloy nanoparticals and the Ag/AgBr hybrid nanostructure. As the typical bimetal or metal/semiconductor plasmonic materials, besides the strong SERS enhancement characteristics, the Au-Ag alloy nanoparticals exhibit excellent monodispersity and the Ag/AgBr hybrid nanostructure demonstrates good stability. The experimental results show that the SERS-based immunoassay of AFP presents a low limit of detection of 1.86 fg/mL and a broad dynamic range from 2 fg/mL to 0.8 g/mL. Furthermore, the clinical applicability of the proposed SERS-based immunoassay has been assessed by the detection of AFP in the human serum samples of cancer patient and healthy person. The test data are consistent well with that of chemiluminescence immunoassay (CLIA) in the relative errors of –8.82–8.06% and show better detection sensitivity. It reveals that the proposed immunoassay protocol is significant for giving insight into the design of ultrasensitive biosensor and the point-of-care testing of cancers.
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Dielectric properties and thermal conductivity of Si3N4–SiC composite ceramics
Zang Xiangrong,Li Haiqing,Lu Yanping,Tan Huihui,Ji Huanli,Yan Ming,Liu Zheng 한국세라믹학회 2022 한국세라믹학회지 Vol.59 No.6
In this work, Si 3N4–SiC composite ceramics were prepared by hot pressing sintering with Y 2O3–MgO–Al2O3 as sintering additives in a fl owing nitrogen atmosphere. The crystal structure and microstructure of Si 3N4–SiC specimens with diff erent SiC content were studied. The XRD results show that the peaks of β-Si 3N4 and SiC were displayed and matched well on XRD patterns. Si 3N4 particles were basically long rod-shaped. Besides, the eff ects of SiC content on thermal conductivity and dielectric properties in W band (75–110 GHz) of sintered Si 3N4–SiC ceramics were researched. The dielectric constant fi rst decreased then increased with the increase of SiC content, while the trend of dielectric loss (tg δ) was opposite. The dielectric constant of Si 3N4–SiC composites for 35 wt% SiC reached a minimum range of 13–20 and tg δ values reached a maximum range of 0.72–0.96 in the frequency of 75–110 GHz. Meanwhile, the thermal conductivity of Si 3N4–SiC composites for 35 wt% SiC was 63.008 W/(m K) at room temperature. The variation of thermal conductivity as test temperature was also studied. The thermal conductivity decreased with increasing test temperature. When the test temperature was 300 °C, the thermal conductivity of the Si 3N4–SiC ceramics for 35 wt% SiC content was 36.022 W/(m K). The Si 3N4–SiC composite ceramics were expected to be applied as microwave absorbing materials.
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Jie Wen,Dongdong Zhao,Yingying Lu,Jing Huang,Yanping Li,Hui Zhang,Airong Li 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.7
A series of resorcinol/formaldehyde (RF) resin-derived carbon spheres modified by polyethylene glycol (PEG) were prepared. The effects of PEG addition time during hydrothermal treatment and molecular weight on the pore structure, surface acidic groups, particle size, and adsorption performances of the obtained spherical activated carbons were investigated. Two types of model fuel containing indole, quinoline, and dibenzothiophene (DBT) as target adsorbates were prepared to evaluate the adsorption performances of the spheres, which increased in the order of DBT<quinoline<indole. Hydrogen bonding may be critical in the removal of indole. Both the surface area and oxygen- containing functional groups influenced the adsorption capacity, with the latter significantly influenced by PEG addition time. PEG addition during the RF resin cross-linking stage sharply reduced the total concentration of acidic groups on the carbon sphere surfaces. The adsorption thermodynamics and kinetics of nitrogen and sulfur compounds were also investigated. The adsorption isotherms of all S/N species were of the Freundlich type at 25 oC. The pseudo-second-order rate equation well described the adsorption kinetics. Both external diffusion and intra-particle diffusion controlled the rate of adsorption.
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