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A Weakly Supervised Object Detection Model for Cyborgs in Smart Cities
ju jianguo,Xing Shiyi,Xing Jinsheng,HOU Qingshan,Liu Bosheng,She Jiao 한국컴퓨터산업협회 2023 Human-centric Computing and Information Sciences Vol.13 No.-
With the development of society, the construction of smart cities has become a current research hot spot. The emergence of cyborg has a great impact on the construction of smart cities especially in smart traffic and video surveillance as it can effectively reduce the staffing burden and secure higher reliability. As cyborgs' key technology for maintaining efficient work, object detection can provide localization and classification information, so it is a fundamental task for image understanding and interpretation. Fully supervised object detection has achieved excellent performance, relying mainly on a large number of accurate manual annotated datasets but is time-consuming and costly. Weakly supervised object detection models require only image-level annotation during training, which greatly reduces the annotation cost; thus gradually becoming the mainstream research direction. However, most weakly supervised object detection models tend to fall into the local optimal solution problem when using multi-instance learning, resulting in low detection accuracy. Therefore, we proposed a coordinate attention mechanism to strengthen the feature representation of the relevant regions to alleviate the tendency of models to focus on local objects. A pseudo-label generation branch and a Fast R-CNN branch were designed to optimize our proposed framework jointly. Experimental results on two public datasets showed that the proposed model could effectively alleviate the local optimal solution problem, where the mean accuracy precision and correct localization on the PASCAL VOC 2007 dataset could yield 52.1% and 68.9%, respectively.
Preparation of Petaloid TPEE@AlOOH Nanofibers with Cr (VI)-Removal Capacity
Jiao-Na Wang,Bin-Bin Jia,Cong-Ju Li 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.2
Hexavalent chromium (Cr (VI)) is a highly toxic pollutant which is harmful to marine organisms as well as humanity. Removing Cr (VI) from water is a hot-spot in environmental remediation. In this work, a novel kind of composite nanofibers membrane (thermal plastic elastomer ester (TPEE)@AlOOH) was first proposed by a simple method, based on a hybrid strategy composed of electrospinning and hydrothermal method. The obtained nanofibrous membrane was turned out to be a petaloid structure, which can enlarge the specific surface area of electrospun fibers. Furthermore, the Cr (VI) removal experiments suggested that the obtained nanofibrous membrane showed a high and fast efficiency, a stable recyclable property for the Cr (VI) removal. Therefore, such a novel nanofibrous membrane can be potentially widely used in Cr (VI) removal.
Stochastic stability analysis of switched genetic regulatory networks without stable subsystems
Jiao, Ticao,Park, Ju H.,Zong, Guangdeng,Liu, Jian,Chen, Yu Elsevier 2019 Applied mathematics and computation Vol.359 No.-
<P><B>Abstract</B></P> <P>This paper is focused on the stability problem of a class of stochastic switched genetic regulatory networks, where the stable property of every subsystem is not imposed. By employing the stabilization effects of switching behaviors and stochastic differential equation theory, a sufficient condition for globally asymptotic stability in mean is derived. Furthermore, inspired by the idea of switching interval segmentation, an easily verifiable criterion is established by means of multiple discretized Lyapunov functions. Then, we extend the attained results to the case with time delays via the multiple discretized Lyapunov-Krasovskii functionals approach. Finally, the results obtained in the paper are illustrated by a numerical example.</P>
Dynamic behavior of an ellipsoidal bubble contaminated by surfactant near a vertical wall
Enbo Ju,Runze Cai,Haopeng Sun,Ying Fan,Wenyi Chen,Jiao Sun 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.5
Adding a small amount of surfactant to gas-liquid two-phase flow can markedly change bubble behavior,which has crucial application value in nuclear energy, petrochemical, chemical, and environmental engineering. In thispaper, the dynamic behavior of a single ellipsoidal bubble (Re~800) contaminated by surfactant rising near a verticalwall in stagnant liquid is studied using the shadow method. The effects of different concentrations of sodium dodecylsulfate solution (100 ppm, 400 ppm, 800 ppm) and initial dimensionless distances on bubble dynamics were compared. The dynamic parameters, shape oscillation, force, and energy of the bubble were analyzed. The results show that thecritical initial dimensionless distance at which the collision occurs is decreased due to a dimensionless distance changefrom 3.3 to 0.23, accelerating the transition from zigzag to spiral movement. Transverse movement of the contaminatedbubble is restrained. Because of the Marangoni effect caused by the surfactant, the boundary condition changesfrom zero shear to non-zero shear, resulting in a decrease in velocity and an increase in the drag coefficient. As the surfactantconcentration increases, the lift coefficient does not significantly change with concentration variations. Theinfluences of the wall effect on velocity and drag gradually weaken. Comparing free-rising and collision conditions, theaspect ratio of the contaminated bubble is distinct from the regularity of a clean bubble. The surfactant also changes thewall-normal velocity frequency and symmetrical shape frequency and inhibits energy conversion during collision.
Dong-Ju Chen,Li-Hua Yan,Qian Li,Cai-jiao Zhang,Chuan-Ling Si,Zhong-Yuan Li,Ya-Jian Song,Hao Zhou,Tong-Cun Zhang,Xuegang Luo 한국식품과학회 2017 Food Science and Biotechnology Vol.26 No.6
Conjugated linoleic acid (CLA) isomers, c9, t11- CLA and t10, c12-CLA, have been proved to exhibit excellent biomedical properties for potential use in anticancer applications and in reducing obesity. Acer truncatum Bunge (ATB), which is rich in unsaturated fatty acids, including oleic acid, linoleic acid, and nervonic acid, is a new resource for edible oil. In the present study, we developed a new method for producing two CLA isomers from ATB-seed oil by fermentation using Lactobacillus plantarum CGMCC8198 (LP8198), a novel probiotics strain. Polymerase chain reaction results showed that there was a conserved linoleate isomerase (LIase) gene in LP8198, and its transcription could be induced by ATBseed oil. Analyses by gas chromatography–mass spectrometry showed that the concentration of c9, t11-CLA and t10, c12-CLA in ATB-seed oil could be increased by about 9- and 2.25-fold, respectively, after being fermented by LP8198.
Density Functional Study of Deoxycytidine Radicals In Irradiated DNA
Yan-ju Ji,Feng-xiang Wang,Yang Jiao 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.-
Density functional theory is used to study the energetics and geometries of deoxycytidine radicals which are formed by removal of hydrogen from ve carbon atoms through irradiation. The C0 1 and C0 4 centered radicals (C0 1 and C0 4) are more energetically favored than the others. To investigate the cytosine release, a potential energy surface scan is performed to break the N1-glycosidic bond (N1-C0 1 bond). The result indicates that the activation energy needed for the N1-glycosidic bond breaking in every one of the deoxycytidine radicals is much lower than that in the parent deoxycytidine. The discussion shows that in irradiated molecular DNA, the C0 4 site is the most favored site for H abstraction; hence, there is C0 4-centered radical formation, subsequently leading to base release. This conclusion is in agreement with the experimental results. Density functional theory is used to study the energetics and geometries of deoxycytidine radicals which are formed by removal of hydrogen from ve carbon atoms through irradiation. The C0 1 and C0 4 centered radicals (C0 1 and C0 4) are more energetically favored than the others. To investigate the cytosine release, a potential energy surface scan is performed to break the N1-glycosidic bond (N1-C0 1 bond). The result indicates that the activation energy needed for the N1-glycosidic bond breaking in every one of the deoxycytidine radicals is much lower than that in the parent deoxycytidine. The discussion shows that in irradiated molecular DNA, the C0 4 site is the most favored site for H abstraction; hence, there is C0 4-centered radical formation, subsequently leading to base release. This conclusion is in agreement with the experimental results.