Image Retrieval Method for Deep Neural Network

Sun Ting,Geng Guohua 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.7

Because of the large data in the image database, the key problem of the retrieval algorithm is to retrieve the required image in the short time. Aiming at this problem, this article given a self-learning deep belief neural network method, and through building layers, input, output, and self-learning algorithm in network architecture to get global algorithm for image retrieval. The accuracy and the convergence of the proposed retrieval method are verified by experiments.

Electrochemical Deposition of γ-MnO2 on Ag/rGO Hybrid Films as Flexible Electrode Materials for Asymmetric Supercapacitor

Shiqing Sun,Yongkun Liu,Guohua Jiang,Bo Yu,Uwamahoro Evariste,Pianpian Ma 대한금속·재료학회 2019 ELECTRONIC MATERIALS LETTERS Vol.15 No.3

The fl exible electrodes are the essential components for fabricating modern fl exible supercapacitors. In this study, a compositehybrid fi lm integrated with silver nanoparticles (Ag NPs), reduced graphene oxide (rGO) and γ-MnO 2 nanorods asa fl exible electrode has been developed by the electrochemical deposition method. The substrate (rGO) of the electrode notonly provides mechanical stability but also ensures fast electron transfer during charge–discharge. The Ag NPs distributedin electrode provide the electronic channel to enhance the electric conductivity. The γ-MnO 2 electroplated on the surface ofhybrid fi lms further improved the electrochemical performance of them. The resultant γ-MnO 2 /Ag/rGO hybrid fi lms exhibita high specifi c capacitance of 1090.3 F g −1 at current density of 0.3 A g −1 . The asymmetric supercapacitor (ASC) deviceswere further fabricated by γ-MnO 2 /Ag/rGO fi lms as anode and AC/rGO fi lms as cathode electrodes within a wide operatingvoltage of 0–1.7 V. The energy density of obtained ASC devices was 71.8 Wh kg −1 at a power density of 279.4 W kg −1 .

Functionalized moso bamboo powder adsorbent for Cd(II) complexes with citric acid/tartrate acid: characterization, adsorptive performance, and mechanism

Qinju Sun,Shaohua Lin,Guohua Liu,Yue Xuan,Liping Gao,Pingping Li 대한환경공학회 2022 Environmental Engineering Research Vol.27 No.5

A new amine group functionalized moso bamboo powder adsorbent (AMBP) was prepared using a facile procedure to remove Cd(II) complexes with citric acid (CA) and tartrate acid (TA). The properties of the AMBP were characterized using SEM, FTIR, XPS, BET, and an elemental analysis. The adsorptive performances of the AMBP toward Cd(II)-CA/TA were investigated. The results indicated that amine group was successfully introduced, and the AMBP with a BET specific surface area of 0.463 ㎡/g was effective in adsorbing Cd(II)-CA/TA under pH 4.0–10.0. The removal of Cd(II) increased significantly when the Cd(II)/ligand molar ratio changed from 1:0.5 to 1:2. The adsorption processes of Cd(II)-CA/TA were endothermic and fit well with the pseudo-second-order kinetic model (R² > 0.999). The Langmuir model (qmax of 14.41 and 7.58 mg/g for Cd(II)-CA and Cd(II)-TA, respectively) fit the isotherms better than the Freundlich model. The AMBP could be regenerated by HCl and reused at least 4 times. The uptake mechanisms of Cd(II)-CA/TA were proposed to be physisorption and the chemisorption of the coordination between –NH₂/–NH and the Cd(II). This work shows that the AMBP is an adsorbent with high practical value to remove Cd(II) in water or wastewater containing CA/TA.

Electrospun Porcine Acellular Dermal Matrix and Polycaprolactone Composite Nanofibrous Scaffolds for Accelerating Wound Healing

Xiaofei Gao,Guohua Jiang,Liming Ruan,Yanfang Sun,Khaydar E. Yunusov,Yanting Jing,Uladzislau E. Aharodnikau,Sergey O. Solomevich 한국섬유공학회 2023 Fibers and polymers Vol.24 No.2

Electrospun nanofibers represent a novel class of scaffold materials that show great potential in wound healing owing torelatively large surface area, better mimicry of native extracellular matrix, adjustable waterproofness and breathability, andprogrammable drug delivery process. In this work, electrospun polycaprolactone (PCL) and porcine acellular dermal matrix(PADM) composite nanofibrous membranes have been developed by electrospinning technology and inflated into threedimensional(3D) structural scaffold (PCL-PADM) by gas foaming method. The obtained PCL-PADM has higher thermalstability, hydrophilicity and better cell adhesion compared with PCL. In addition, ε-polylysine (ε-PL) is further attachedonto the surface of PADM/PCL to offer its good antibacterial properties. Moreover, the PADM/PCL fibrous scaffolds showexcellent cytocompatibility for promoting cell proliferation. In vivo models showed that the resultant PADM/PCL fibrousscaffolds exhibit an accelerating wound healing effect through promoting expression of vascular factor (CD31) and decreasingthe expression of tumor necrosis factor-α (TNF-α). These results indicate that the 3D fibrous scaffolds may be a potentialwound dressing for wound closure.

Detection of Colorectal Cancer Genes Using a Dye-free Method Combining Barcode-base Multiplex Ligation-dependent Probe Amplification and Pyrosequencing

Shuo Li,Lizhou Sun,Guohua Zhou,Huan Huang 한국생물공학회 2015 Biotechnology and Bioprocess Engineering Vol.20 No.6

Early detection of abnormal expression levels of cancer-related genes is crucial for reducing cancer mortality. Here, we describe a dye-free multiplex bioassay for simultaneous and quantitative analysis of the expression levels of multiple genes from one sample in a single assay, based on Sequence-tagged Multiplex ligationdependent probe Amplification (MLPA) coupled with pyrosequencing (termed as “SMAP”). Each pair of MLPA probes, containing a designed barcode, represents a gene of interest; thus, the use of various dyes to label different genes was avoided. The unique three-base barcode design on the probes, which can be decoded by pyrosequencing, enables individual quantification of the expression levels of six genes. Moreover, a new carryover contamination prevention system based on the use of restriction endonucleases was developed for PCR-based diagnostic screening assays. SMAP analysis revealed significant differences between the expression levels of CRC-related genes in the tumor tissues and normal tissues from a CRC patient. For PCR-based diagnostic screening assays, 0.5 U of the FokI restriction endonuclease was sufficient for the removal 0.01 pmol of PCR contamination. The ability to analyze the expression levels of a greater number of cancer-related genes would improve diagnostic sensitivity and efficacy. SMAP is amenable to the detection of an increased number of genes by lengthening the artificially designed barcodes; thus our method provides a promising means for cancer diagnostics and improving the treatment options available to cancer patients.

Effect of Gas Bubbling on Tensile Elongation of Gravity Mold Castings of Magnesium Alloy

Yim, Chang Dong,Wu, Guohua,You, Bong Sun The Japan Institute of Metals 2007 MATERIALS TRANSACTIONS Vol.48 No.10

<P>The effect of Ar gas bubbling on the tensile elongation of gravity mold castings of AZ91D magnesium alloy was evaluated qualitatively. The beneficial effect of gas bubbling on the tensile elongation of castings was resulted from the removal of inclusions in melt. The removal efficiency of inclusion by bubble floatation is dependent on processing variables including flow rate of gas, gas blowing time and melt temperature. Considering only the interaction between bubble and inclusion, the removal efficiency of inclusion will increase with increase in flow rate of gas, gas blowing time and melt temperature. But dissolution of gas into melt and entrance of new non-metallic particles formed on the melt surface deteriorated the tensile elongation of castings.</P>

Thiomer를 활용한 ASR 소각재의 중금속 고형화 특성 연구

백진웅,( Aafaq Ur Rehman ),( Pham Viet Nguyen ),( Sun Guohua ),( Manyandi Venkatesan ),( Shrestha Keshab ),( Srinivasa Reddy Mallampati ),박흥석 한국폐기물자원순환학회(구 한국폐기물학회) 2016 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2016 No.-

우리나라는 연간 많은 양의 원유를 해외에서 수입하며, 원유는 정제과정을 거쳐 다양한 석유제품으로 생산된다. 원유의 정제과정 중 탈황공정에서는 산업부산물인 부생유황이 생산되는데, 저유황유의 수요증가에 따라 부생유황의 생산량도 증가하는 추세에 있다. 부생유황에 유기물을 첨가하여 유황을 개질하면 유황폴리머바인더(Thiomer)가 되는데 시멘트와 아스팔트를 대체하는 친환경 건설자재로 활용되고 있다. 한편, 폐 자동차의 재활용률 기준의 향상에 따른 자동차파쇄잔재물(ASR)의 에너지화로 중금속 함량이 높은 ASR 소각재 발생량도 증가하고 있어, 이를 환경적으로 안전하게 처리하며, 재활용하는 방안이 필요한 실정이다. 본 연구는 유황폴리머바인더(Thiomer)를 활용한 ASR 소각재의 고형화를 위한 기초연구로 고형화에 따른 구조적 특성과 환경적 특성을 평가하였다. 이를 위해 ASR 소각재의 중금속함량을 측정하고, 유황폴리머바인더, 소각재 및 모래의 배합설계비에 따라 공시체(직경 50mm, 높이 100mm)를 제작하였다. 제작된 공시체는 24시간이 지난 후 탈형하고, 7일간 공기 중에서 양생하여 압축강도를 측정하였으며, 공시체를 5mm이하의 크기로 파쇄하여 중금속 용출농도를 측정하였다. 실험결과 고형화 후 압축강도는 유황폴리머바인더 40 wt%, 소각재 40 wt%, 모래 20 wt%의 배합설계비에서 최대 77.03MPa로 높은 강도가 나타났다. 중금속 용출은 지정폐기물판정 기준(Pb : 3.0 mg/l, Cu : 3.0 mg/l, Cd : 0.3 mg/l, Cr : 1.5 mg/l)보다 낮은 0.1 mg/l 이하로 고형화 효율이 90% 이상으로 나타났다. 이상의 결과는 ASR 소각재를 Thiomer로 고형화하여 건설자재로 활용함으로써 자동차 재활용률을 제고시킬 수 있는 가능성을 확인할 수 있었다.

Researching the loading characteristics of a continuous miner on the basis of the fluidity effects of coal and rock particles

You Chen,Hong Zhang,Zhihong Zhang,Honghong Yan,Guohua Li,Xiaojuan Sun 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.6

Understanding the interaction between the star wheel arm and coal particles is important to efforts for improving the loading efficiency and reducing the energy consumption of the feeder star wheel. The interaction mechanism between the star wheel arm and coal particles is the theoretical basis of the research. First, the design method of the star wheel arm shape was provided, then a model of the star wheel was constructed with EDEM and a simulation structure. Finally, the influence of the parameters on loading efficiency and energy consumption was determined. Results have been shown that the coal particles in the active zone of the material pile exerts a fluidity effect on loading efficiency and torque. The loading efficiency and energy consumption have been increased with increase in the number of arm and height of the arm. The feeder inclination angle 14° is the best coal loading angle.

Identification of Novel Subregions of LOH in Gastric Cancer and Analysis of the HIC1 and TOB1 Tumor Suppressor Genes in These Subregions

Jingcui Yu,Songbin Fu,Peng Liu,Xiaobo Cui,Yu Sui,Guohua Ji,Rongwei Guan,Donglin Sun,Wei Ji,Fangli Liu,An Liu,Yuzhen Zhao,Yang Yu,Yan Jin,Jing Bai,Jingshu Geng,Yingwei Xue,Jiping Qi,Ki-Young Lee 한국분자세포생물학회 2011 Molecules and cells Vol.32 No.1

Previously, we identified 3 overlapping regions showing loss of heterozygosity (LOH, R_1-R_3 from 11 to 30 cM) on chromosome 17 in 45 primary gastric cancers (GCs). The data indicated the presence of tumor suppressor genes (TSGs) on chromosome 17 involved in GC. Among the putative TSGs in these regions, HIC1 (in SR_1) and TOB1 (in SR_3) remain to be examined in GC. By immunohistochemistry (IHC), methylation-specific PCR (MSP) and western blot, we evaluated the expression and regulation status for HIC1 and TOB1 protein in GC. We narrowed down the deletion intervals on chromosome 17 and defined five smaller LOH subregions, SR_1-SR_5 (0.54 to 3.42 cM), in GC. We found that HIC1 had downregulated expression in 86% (91/106) and was methylated in 87% (26/30) of primary GCs. Of the primary GCs showing downregulation of HIC1 protein, 75% (18/24) had methylated HIC1 gene. TOB1 was either absent or expressed at reduced levels in 75% (73/97) of the GC samples. In addition, a general reduction was found in total and the ratio of unphosphorylated to phosphorylated TOB1 protein levels in the differentiated GC cell lines. Further analysis revealed significant simultaneous downregulation of both HIC1 and TOB1 protein in GC tissue microarray samples (67%, 52/78) and in primary GCs (65%, 11/17). These results indicate that silencing of HIC1 and TOB1 expression is a common occurrence in GC and may contribute to the development and progression of the disease.