Synthesis of LaMnO3–Diamond Composites and Their Photocatalytic Activity in the Degradation of Weak Acid Red C-3GN

Hao Huang,Benqian Lu,Yuanyuan Liu,Xeuqian Wang,Jie Hu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.10

In this study, a series of LaMnO3–diamond composites with varied LaMnO3 mass contents supported on micro-diamond have been synthesized using a sol–gel method. The as-prepared composites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy and the Fourier transform infrared spectra (FTIR). Meanwhile, the photocatalytic performances were also tested by photoluminescence (PL) spectroscopy, ultraviolet–visible diffuse reflection spectra (UV-Vis DRS) and the degradation of weak acid red C-3GN (RC-3GN). Results show that the peak position of LaMnO3 is shifted to low angle after the introduction of diamond, and perovskite particles uniformly distributed on the surface of diamond, forming a network structure, which can increase the active sites and the absorption of dye molecules. When the mass ratio of LaMnO3 and diamond is 1:2 (LMO–Dia-2), the composite shows the most excellent photocatalytic activity. This result offers a sample route to enlarge the range of the application of micro-diamond and provide a new carrier for perovskite photocatalysts.

An Image Spatial Domain Steganography Algorithm with High Payload, Commendable Perceptual Quality and High Statistical Un-detectability

Hao Huang,Zhiping Zhou 보안공학연구지원센터 2016 International Journal of Security and Its Applicat Vol.10 No.9

The Octonary PVD algorithm is the method that simultaneously achieves three contradicting objectives, high payload, commendable perceptual quality and high statistical un-detectability. However, the Octonary PVD algorithm has a major defect that it does not embed the secret data in the optimum locations because it does not consider the use of different pixel groups will have different effects on the statistical undetectability and payload of the stego image in the process of embedding. In view of the above problem, an improved steganography is proposed. An improved objective function which is used by the PSO module is defined at first in this proposed method. Then, an improved data hiding scheme is proposed. The proposed algorithm is an improved method based on the Octonary PVD algorithm, and the improved objective function which be used by the PSO module is set in such a way that both perceptual quality and statistical un-detectability are considered. This proposed algorithm has high statistical un-detectability and high payload with commendable visual quality. An extensive experimental evaluation has demonstrated the excellent performance of the proposed algorithm compared with other existing image spatial domain steganography algorithms.

The Robotic Arm Velocity Planning Based on Reinforcement Learning

Hao-Hsuan Huang,Chih‑Kai Cheng,Yi‑Hung Chen,Hung‑Yin Tsai 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.24 No.9

In order to improve the performance of the robotic arm effectively, this study established a robotic arm velocity planning model developed by artificial intelligence in the simulation system. The model not only considered the dynamic factors of the robotic arm but was also able to set different customized conditions such as machining accuracy and rotation angle. The study could be divided into three parts. First, the simulation environment was constructed with the ABB IRB140 six axes multipurpose industrial robot. To be consistent with real-world situations, a Vortex physics engine was applied to the simulation supplying varying locomotion parameters. In this research, friction, kinematics, and inertia were considered. Second, artificial intelligence was imported into the robotic arm through the establishment of connecting V-rep and Python. The proposed model was developed in the Python environment by deep deterministic policy gradients. Eventually, a design of the appropriate reward function governing the ultimate results was presented. Compared with traditional velocity planning, the proposed method can decline moving error by 0.05 degrees under the considerations involving dynamic factors in a robotic arm. Besides, the proposed velocity planning strategy could be obtained after taking the training time of one hour which can meet the demand for the time cost of the industry.

Low-crosstalk high-density polymeric integrated optics incorporating self-assembled scattering monolayer.

Huang, Guang-Hao,Kim, Jun-Whee,Chu, Woo-Sung,Oh, Min-Cheol,Seo, Jun-Kyu,Noh, Young-Ouk,Lee, Hyung-Jong Optical Society of America 2014 Optics express Vol.22 No.12

<P>Highly integrated optical components are strongly demanded because they enable wavelength-division multiplexing optical communication systems to achieve smaller footprints, lower power consumption, and enhanced reliability. Variable optical attenuator (VOA) arrays are often used with optical switches in cascaded form for reconfigurable optical add-drop multiplexer systems. Although VOAs and optical switches based on polymer waveguide technology are commercially available, it is still not viable to integrate these two array devices on a single chip because of significant interchannel crosstalk. In this work, we resolved the issue of crosstalk and integrated the arrays of optical switch and VOA on a single chip by incorporating a self-assembled scattering monolayer (SASM). The SASM was effective for scattering the planar guided mode; consequently, the crosstalk into an adjacent channel was significantly reduced, to less than -35 dB.</P>

An Image Steganography Algorithm based on the Quantitative Features of Higher Order Local Model

Hao Huang,Zhiping Zhou 보안공학연구지원센터 2016 International Journal of Security and Its Applicat Vol.10 No.7

HUGO is the content-based adaptive steganography method for spatial images which can approximately preserve the joint statistic of differences between up to four neighboring pixels in four different directions. But the steganalysis method based on the higher order local model can fail HUGO. In view of the above problem, an improved steganography is proposed. Firstly, by analyzing the higher order local model, the distortion function is defined based on the quantitative MINMAX features. Then, combined with the theoretical framework of the Gibbs construction in steganography, the improved image steganography algorithm is proposed. The experimental results show that the proposed algorithm can not only resist the detection of the steganalysis method based on the quantitative MINMAX features , but also resist the detection of the steganalysis method based on the hybrid quantitative MINMAX features.

A study on fiber-reinforced elastomer with a biphasic loading behavior

Huang, Hao,Joe, Chee-Ryong,Kim, Dong-Uk,Lee, Jehyun,Choi, Heekyu Walter de Gruyter GmbH 2012 Science and engineering of composite materials Vol.19 No.4

Exercise Reduces Airway Smooth Muscle Contraction in Asthmatic Rats via Inhibition of IL-4 Secretion and Store-Operated Ca2+ Entry Pathway

Huang Jun-Hao,Gao Hui-Wen,Gao Dong-Dong,Yang Wei-Yue,Zhao Meng-Ke,Shen Bing,Hu Min 대한천식알레르기학회 2023 Allergy, Asthma & Immunology Research Vol.15 No.3

Purpose: Increased evidence has shown that aerobic exercise reduces airway hyperresponsiveness in asthmatic individuals. However, the underlying mechanisms of action remain elusive. This study aimed to investigate the effect of exercise on airway smooth muscle (ASM) contractile function in asthmatic rats, and uncover the possible involvement of interleukin 4 (IL-4) and the store-operated Ca2+ entry (SOCE) pathway. Methods: In this study, chicken ovalbumin was used to induce asthma in male Sprague-Dawley rats. The exercise group received moderate-intensity aerobic exercise training for 4 weeks. IL-4 concentrations in bronchoalveolar lavage fluid (BALF) samples were evaluated by enzyme linked immunosorbent assay. The contractile function of the ASM was investigated using tracheal ring tension experiments and intracellular Ca2+ imaging techniques. Western blot analysis was used to evaluate expression levels of calcium-release activated calcium (CRAC) channel protein (Orai) and stromal interaction molecule 1 (STIM1) in ASM. Results: Our data showed that the carbachol-stimulated, SOCE-mediated contraction of rat ASM was significantly increased in asthmatic rats, which could be abolished by exercise. Pharmacological studies revealed that GSK5498A and BTP-2, selective blockers of CRAC channels significantly inhibited SOCE-induced ASM contraction. In addition, exercise inhibited the up-regulation of IL-4 in BALF as well as STIM1 and Orai expression in the ASM of asthmatic rats. In line with these observations, we demonstrated that pretreatment of the ASM with IL-4 up-regulated the expression level of STIM1, Orai1 and Orai2, thereby promoting SOCE-mediated ASM contraction. Conclusions: The data in this study reveal that aerobic exercise may improve the ASM contractile function in asthmatic rats by inhibiting IL-4 secretion and by down-regulating the expression of STIM1, Orai1 and Orai2, thus decreasing excessive SOCE-mediated ASM contraction in asthmatic rats.

Expression Profiling of Lipopolysaccharide Target Genes in RAW264.7 Cells by Oligonucleotide Microarray Analyses

Hao Huang,Cheol Kyu Park,Ji Yoon Ryu,Eun-Ju Chang,Youngkyun Lee,강삼식,김홍희 대한약학회 2006 Archives of Pharmacal Research Vol.29 No.10

In inflammatory responses, induction of cytokines and other immune regulator genes in macrophages by pathogen-associated signal such as lipopolysaccharide (LPS) plays a crucial role. In this study, the gene expression profile changes by LPS treatment in the macrophage/monocyte lineage cell line RAW264.7 was investigated. A 60-mer oligonucleotide microarray of which probes target 32381 mouse genes was used. A reverse transcription-in vitro translation labeling protocol and a chemileuminescence detection system were employed. The mRNA expression levels in RAW264.7 cells treated for 6 h with LPS and the control vehicle were compared. 747 genes were up-regulated and 523 genes were down-regulated by more than 2 folds. 320 genes showing more than 4-fold change by LPS treatment were further classified for the biological process, molecular function, and signaling pathway. The biological process categories that showed high number of increased genes include the immunity and defense, the nucleic acid metabolism, the protein metabolism and modification, and the signal transduction process. The chemokine-cytokine signaling, interleukin signaling, Toll receptor signaling, and apoptosis signaling pathways involved high number of genes differentially expressed in response to LPS. These expression profile data provide more comprehensive information on LPS-target genes in RAW264.7 cells, which will be useful in comparing gene expression changes induced by extracts and compounds from anti-inflammatory medicinal herbs.

A Parallel Personalized Recommendation Algorithm using Bipartite Graphs

Hao Huang,Sotirios G. Ziavras,Yaojie Lu 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.7

BDM-NBI algorithm is proposed in this paper. It focuses on the analysis of a personalized recommendation algorithm that utilizes a weighted bipartite graph suitable for processing big data. To improve the performance of this recommendation algorithm through parallel processing techniques, a sparse matrix partitioning algorithm is then developed that uses the bipartite graph as input. Our algorithm adopts bipartite graph partitioning using a vertex separator method that partitions a high-dimensional sparse matrix into a pseudo-block based diagonal matrix. Then, the recommendation algorithm analyzes all weighted sub-matrices in parallel. We produce the global recommendation weighted matrix by merging all of the sub-matrices in parallel. Experiments with Hadoop show that our algorithm has good approximation for small matrices and excellent scalability.

Catalytic upgrading of chitin: Advances, mechanistic insights, and prospect

Hao Huang,Guangping Zhou,Shaojuan Luo,Shaoqu Xie 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.128 No.-

The most plentiful renewable nitrogenous material on earth is chitin, which may be obtained from theshell waste of crustaceans. This waste is not fully utilized, resulting in resource waste and disposal problems. Due to the enormous potential of chitin pricing, a novel idea for shell biorefining has recently beenput forth. Several valuable chemicals have been produced from chitin biomass, including small-moleculecompounds, prodrugs, and monomers of polymers. This paper reviews the recent progress in the catalyticconversion of chitin, chitosan, and their derivatives to various chemicals and biomaterials. The selectionand properties of catalysts and catalytic systems were introduced. The mechanism of transformation ormodification is emphasized. The challenges and prospects of chitin transformation and modification arepresented.