Multi-level Cross-attention Siamese Network For Visual Object Tracking

Jianwei Zhang,Jingchao Wang,Huanlong Zhang,Mengen Miao,Zengyu Cai,Fuguo Chen 한국인터넷정보학회 2022 KSII Transactions on Internet and Information Syst Vol.16 No.12

Currently, cross-attention is widely used in Siamese trackers to replace traditional correlation operations for feature fusion between template and search region. The former can establish a similar relationship between the target and the search region better than the latter for robust visual object tracking. But existing trackers using cross-attention only focus on rich semantic information of high-level features, while ignoring the appearance information contained in low-level features, which makes trackers vulnerable to interference from similar objects. In this paper, we propose a Multi-level Cross-attention Siamese network(MCSiam) to aggregate the semantic information and appearance information at the same time. Specifically, a multi-level cross-attention module is designed to fuse the multi-layer features extracted from the backbone, which integrate different levels of the template and search region features, so that the rich appearance information and semantic information can be used to carry out the tracking task simultaneously. In addition, before cross-attention, a target-aware module is introduced to enhance the target feature and alleviate interference, which makes the multi-level cross-attention module more efficient to fuse the information of the target and the search region. We test the MCSiam on four tracking benchmarks and the result show that the proposed tracker achieves comparable performance to the state-of-the-art trackers.

Study on the transition wavelengths and oscillator strengths of the 1s2n′g–1s2nh state of the Li-like system

Liu Xin,Zhang Jingchao 한국물리학회 2023 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.82 No.2

In this paper, the spectral properties of 1s2 n′g–1s2 nh states of Li-like ions with larger atomic numbers (Z=21–32) are studied. The transition wavelengths of 1s2 5g–1s2 nh states from Sc XIX to Ge XXX are calculated. The dipole transition oscillator strengths of 1s2 n′g–1s2 nh confguration for Li-like ions under the three specifcations of length, velocity, and acceleration have been obtained. It is found that the three simulation results obtained are very consistent. For the transition of 1s2 5g–1s2 nh state, the dipole transition length oscillator strengths basically remain unchanged with increasing atomic number. The value of the transition oscillator strengths under the same Rydberg sequence decreases with increasing main quantum number n of the fnal state, and gradually tends to zero. Thus, the theoretical calculation of the oscillator strengths of the Li-like sequence with a higher atomic number in the entire energy threshold range is realized.

Study of non-relativistic energy and fine structure splitting using a Rayleigh–Ritz method for a high-angular-momentum state

Liu Xin,Zhang Jingchao 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.80 No.3

Based on the Rayleigh–Ritz variation method, the non-relativistic energies of highly excited 1s2nl (l = g, h) states of a lithiumlike isoelectronic sequence have been studied. We also investigated the fine structure splitting of the 1s2nl (l = g, h) states, which includes spin–orbital effects, spin–other orbital effects, quantum electrodynamics (QED) corrections and higher order relativistic corrections. The fine structure splitting values of the 1s25g state are compared with those in the existing literature. At present, no relevant data on 1s2nl (l = g, h) (n ≥ 6) have been found. Consequently, the calculation results in this paper should provide a valuable reference. We also obtained the regularities of the fine structure splitting with the nuclear charge number Z and the main quantum number n and found a physical law that the fine structures of the 1s2nl (l = g, h) states is proportional to the fourth power of the effective nuclear charge Zeff.

Quantum defects of 1s2nh configurations in Li-like system from Sc XIX to Zn XXVIII ion

Liu Xin,Zhang Jingchao 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.80 No.12

In this paper, the calculated ionization potential by the R-matrix method is compared with that by the full-core-plus-correlation (FCPC) method, which can verify the accuracy of the wave function. The quantum defects of the Rydberg series of the 1s2 nh states from Sc XIX to Zn XXVIII ions are calculated by the R-Matrix method. The quantum defect function of the 1s2 nh channel is obtained by theoretical calculation with the R-Matrix method. The quantum defects and highly excitated energies of high Rydberg states of the 1s2 nh states for lithium-like ions are calculated. Thus the reliable theoretical prediction of energies and quantum defects for the high Rydberg state of lithium-like ions is realized.

Expression of Translationally Controlled Tumor Protein (TCTP) Gene of Dirofilaria immitis Guided by Transcriptomic Screening

Yan Fu,Jingchao Lan,Xuhang Wu,Deying Yang,Zhihe Zhang,Huaming Nie,Rong Hou,Runhui Zhang,Wanpeng Zheng,Yue Xie,Ning Yan,Zhi Yang,Chengdong Wang,Li Luo,Li Liu,Xiaobin Gu,Shuxian Wang,Xuerong Peng,Guangy 대한기생충학열대의학회 2014 The Korean Journal of Parasitology Vol.52 No.1

Bioenzyme-based nanomedicines for enhanced cancer therapy

Ding Mengbin,Zhang Yijing,Li Jingchao,Pu Kanyi 나노기술연구협의회 2022 Nano Convergence Vol.9 No.7

Bioenzymes that catalyze reactions within living systems show a great promise for cancer therapy, particularly when they are integrated with nanoparticles to improve their accumulation into tumor sites. Nanomedicines can deliver toxic bioenzymes into cancer cells to directly cause their death for cancer treatment. By modulating the tumor microenvironment, such as pH, glucose concentration, hypoxia, redox levels and heat shock protein expression, bioenzyme-based nanomedicines play crucial roles in improving the therapeutic efficacy of treatments. Moreover, bioenzyme-mediated degradation of the major components in tumor extracellular matrix greatly increases the penetration and retention of nanoparticles in deep tumors and infiltration of immune cells into tumor tissues, thus enhancing the efficacies of chemotherapy, phototherapy and immunotherapy. In this review, we summarize the recent progresses of bioenzyme-based nanomedicines for enhanced cancer therapy. The design and working mechanisms of the bioenzyme-based nanomedicines to achieve enhanced chemotherapy, photothermal therapy, photodynamic therapy, chemodynamic therapy, radiotherapy and immunotherapy are introduced in detail. At the end of this review, a conclusion and current challenges and perspectives in this field are given.

Antibody-conjugated gold nanoparticles as nanotransducers for second near-infrared photo-stimulation of neurons in rats

Liu Jiansheng,Li Jiajia,Zhang Shu,Ding Mengbin,Yu Ningyue,Li Jingchao,Wang Xiuhui,Li Zhaohui 나노기술연구협의회 2022 Nano Convergence Vol.9 No.13

Infrared neural stimulation with the assistance of photothermal transducers holds great promise as a mini-invasive neural modulation modality. Optical nanoparticles with the absorption in the near-infrared (NIR) window have emerged as excellent photothermal transducers due to their good biocompatibility, surface modifiability, and tunable optical absorption. However, poor activation efficiency and limited stimulation depth are main predicaments encountered in the neural stimulation mediated by these nanoparticles. In this study, we prepared a targeted polydopamine (PDA)-coated gold (Au) nanoparticles with specific binding to thermo-sensitive ion channel as nanotransducers for second near-infrared (NIR-II) photo-stimulation of neurons in rats. The targeted Au nanoparticles were constructed via conjugation of anti-TRPV1 antibody with PEGylated PDA-coated Au nanoparticles and thus exhibited potent photothermal performance property in the second NIR (NIR-II) window and converted NIR-II light to heat to rapidly activate Ca 2+ influx of neurons in vitro. Furthermore, wireless photothermal stimulation of neurons in living rat successfully evoke excitation in neurons in the targeted brain region as deep as 5 mm beneath cortex. This study thus demonstrates a remote-controlled strategy for neuromodulation using photothermal nanotransducers.

Chemically encoded self-organized quantum chain supracrystals with exceptional charge and ion transport properties

Hou, Bo,Sohn, Myungbeom,Lee, Young-Woo,Zhang, Jingchao,Sohn, Jung Inn,Kim, Hansu,Cha, SeungNam,Kim, Jong Min unknown 2019 Nano energy Vol.62 No.-

<P><B>Abstract</B></P> <P>Artificially grown superstructures from small building blocks is an intriguing subject in ‘bottom-up’ molecular science and nanotechnology. Although discrete nanoparticles with different morphologies and physicochemical properties are readily produced, assembly them into higher-order structure amenable to practical applications is still a considerable challenge. This report introduces a stepwise heterogeneous approach for coupling colloidal quantum dots (QDs) synthesis with self-organization to directly generate quantum chains (QCs). By using vulcanized sulfur precursors, QDs are interdigitated into microscale chainlike supracrystals associated with oleylamine and oleic acid as structure directing agents. The cooperative nature of the QD growth and assembly have been extended to fabricate binary (PbS) and ternary metal chalcogenides (CuInS<SUB>2</SUB>) QC superstructures over a range of length scales. In addition, enhanced ion and charge transfer performance have been demonstrated which are determined to originate from the minimum interparticle distance and nearly bare nanocrystal surface. The process reported here is general and can be readily extended to the production of many other metal chalcogenide QD superstructures for energy storage applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A new methodology for chemical synthesis self-organized quantum chain supracrystals. </LI> <LI> Binary and ternary metal chalcogenides quantum chain superstructures have been demonstrated over a range of length scales. </LI> <LI> Enhanced electrochemical capacity and durability via preserved nanograin boundaries and long-range ordered configuration. </LI> <LI> Demonstrate exceptional charge and ion transport properties in DFT simulations and lithium-ion batteries. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Establishment of the Corner Correlation Method and Its Application in Rock Dynamic Test

Xingui Zhou,Wei Li,Yang Liu,Hong Miao,Ruyue Zhang,Jingchao Xu,Shu Wang,Xinshuai Peng 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.9

After combining the corner extraction method with the digital image correlation method, a new algorithm called the corner correlation method (CCM) was proposed, realizing a high-precision measurement for the displacement field and strain field on the surface of the specimen. It is applicable to the model with complex damage on the calculated surface. The errors of cross-crack speckle pattern and corner pattern are compared, and it was concluded that the errors of corner pattern of transverse and longitudinal cracks are less than that of the speckle pattern. The calculation accuracy of the corner correlation method is evaluated and verified by numerical simulation, static tensile test and dynamic uniaxial compression test respectively. It was found that the calculation accuracy was the highest with the Newton iteration method. The displacement calculation accuracy is about 0.01 pixels and the resolution of the measurement system for the strain test was on the order of 10-4under dynamic load.