Prediction Models for Solitary Pulmonary Nodules Based on Curvelet Textural Features and Clinical Parameters

Wang, Jing-Jing,Wu, Hai-Feng,Sun, Tao,Li, Xia,Wang, Wei,Tao, Li-Xin,Huo, Da,Lv, Ping-Xin,He, Wen,Guo, Xiu-Hua Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.10

Lung cancer, one of the leading causes of cancer-related deaths, usually appears as solitary pulmonary nodules (SPNs) which are hard to diagnose using the naked eye. In this paper, curvelet-based textural features and clinical parameters are used with three prediction models [a multilevel model, a least absolute shrinkage and selection operator (LASSO) regression method, and a support vector machine (SVM)] to improve the diagnosis of benign and malignant SPNs. Dimensionality reduction of the original curvelet-based textural features was achieved using principal component analysis. In addition, non-conditional logistical regression was used to find clinical predictors among demographic parameters and morphological features. The results showed that, combined with 11 clinical predictors, the accuracy rates using 12 principal components were higher than those using the original curvelet-based textural features. To evaluate the models, 10-fold cross validation and back substitution were applied. The results obtained, respectively, were 0.8549 and 0.9221 for the LASSO method, 0.9443 and 0.9831 for SVM, and 0.8722 and 0.9722 for the multilevel model. All in all, it was found that using curvelet-based textural features after dimensionality reduction and using clinical predictors, the highest accuracy rate was achieved with SVM. The method may be used as an auxiliary tool to differentiate between benign and malignant SPNs in CT images.

Numerical Analysis on the Dynamics Pneumatic Vibrators

Jing Yang Qi,Guo Zhong Zhang,Bang Feng Wang,Rui Fang Zhang 대한기계학회 1997 Asia-Pacific Vibration Conference Vol.2 No.1

Crystallographic Characterizations of Eutectic and Secondary Carbides in a Fe-12Cr-2.5Mo-1.5W-3V-1.25C Alloy

Jing Guo,Ligang Liu,Yunli Feng,Sha Liu,Xuejun Ren,Qingxiang Yang 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.2

In this work, the morphology and structures of the eutectic and secondary carbides in a new high chromiumFe-12Cr-2.5Mo-1.5W-3V-1.25C designed for cold-rolling work roll were systematically studied. The precipitatedcarbides inside the grains and along the grain boundaries were investigated with optical microscope,scanning electron microscopy with energy dispersive spectroscopy, transmission electron microscopy andX-Ray diffraction. Selected area diffraction patterns have been successfully used to identify the crystal formationand lattice constants of the carbides with different alloying elements. The results show that the eutectic carbidesprecipitated contain MC and M2C distributed along the grain boundaries with dendrite feature. The compositionand crystal structure analysis shows that the eutectic MC carbides contain VC and WC with a cubic and hexagonalcrystal lattice structures respectively, while the eutectic M2C carbides predominantly contain V2C and Mo2Cwith orthorhombic and hexagonal crystal lattices respectively. The secondary carbides contain MC, M2C,M7C3 formed along the grain boundaries and their sizes are much larger than the eutectic carbides ones. The secondary M23C6 is much small (0.3-0.5μm) and is distributed dispersively inside the grain. Similar tothe eutectic carbides, the secondary carbides also contain VC, WC, V2C, and Mo2C. M7C3 is hexagonal(Fe,Cr)7C3, while M23C6 is indexed to be in a cubic crystal form.

Experimental and theoretical studies of drug-polymer interactions to control the drug distributions in dissolving microneedles

Jing Ling Liu,Yun Hao Feng,Xiao Peng Zhang,Dan Dan Zhu,Li Qin Zhang,Xin Dong Guo 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.84 No.-

Dissolving microneedles (DMNs) have attracted extensive attention for transdermal drug delivery inrecent years. Generally, the skin elasticity impedes DMNs to fully insert into skin thus optimizedfabrication methods are needed to improve delivery efficiency. Here, we investigated the formulations ofDMNs as the main influencing factors during the microneedle preparation process. Through the selectionof the matrix materials and the optimization of the ratio and formulae, the DMNs can meet therequirements of convenient and effective drug delivery. For DMNs prepared with polyvinyl alcohol (PVA)as matrix material, the 25 wt% concentration of PVA was beneficial to prepare MNs, which MNs was ableto focus drug on the part of MN tips. However, for DMNs fabricated with hyaluronic acid (HA), theincreasing material concentration had a weaker ability to concentrate drug in MNs and increasedthe difficulty of preparing MNs. The computer simulation analysis was consistent with the results of theexperiment, indicating the feasibility of modelling to investigate the preparation technology of DMNsthat offer appropriate, convenient and highly efficient drug delivery.

Stability analysis of semi-rigid composite frames

Guo-Qiang Li,Jing-Feng Wang 국제구조공학회 2007 Steel and Composite Structures, An International J Vol.7 No.2

Based on stability theory of current rigid steel frames and using the three-column subassemblage model, the governing equations for determining the effective length factor (μ-factor) of the columns in semirigid composite frames are derived. The effects of the nonlinear moment-rotation characteristics of beam-tocolumn connections and composite action of slab are considered. Furthermore, using a two-bay three-storey composite frame with semi-rigid connections as an example, the effects of the non-linear moment-rotation characteristics of connections and load value on the μ-factor are numerically studied and the μ-factors obtained by the proposed method and Baraket-Chen’s method are compared with those obtained by the exact finite element method. It was found that the proposed method has good accuracy and can be used in stability analysis of semi-rigid composite frames.

Generic Constructions for Strong Designated Verifier Signature

Feng, Deng-Guo,Xu, Jing,Chen, Wei-Dong Korea Information Processing Society 2011 Journal of information processing systems Vol.7 No.1

A designated verifier signature is a special type of digital signature, which convinces a designated verifier that she has signed a message in such a way that the designated verifier cannot transfer the signature to a third party. A strong designated verifier signature scheme enhances the privacy of the signer such that no one but the designated verifier can verify the signer's signatures. In this paper we present two generic frame works for constructing strong designated verifier signature schemes from any secure ring signature scheme and any deniable one-pass authenticated key exchange protocol, respectively. Compared with similar protocols, the instantiations of our construction achieve improved efficiency.

Bone Formation in Ectopic and Osteogenic Tissue Induced by a Novel BMP-2-related Peptide Combined with Rat Tail Collagen

Jing-Feng Li,Zhen-Yu Lin,Qi-Xin Zheng,Xiao-Dong Guo,Shu-Hua Yang,Hong-Wei Lu,Sheng-Hui Lan 한국생물공학회 2010 Biotechnology and Bioprocess Engineering Vol.15 No.5

Bone morphogenetic proteins (BMPs) play an important role in regulating osteoblast differentiation and subsequent bone formation, mainly evidenced by the induced osteogenic ability of BMP-2 from BMPs. However, BMP-2 alone does not induce the expected efficacy due to its short retention in vivo. In this study, a novel BMP-2-related peptide (designated P24) derived from the “knuckle epitope”of BMP-2 was coupled covalently to type I collagen derived from rat tail and observed under scanning electron microscopy (SEM) in low vacuum mode. The BMP-2-related peptide/collagen composite was implanted in vivo into the pocket of the quadriceps musculature of Sprague-Dawley (SD) rats and then harvested 3 or 6 weeks after surgery. It was found that lyophilized collagen retained a porous network structure with an average inner-diameter of 90 ~ 160 μm. Based on radiographic evaluation and histological examination, BMP-2-related peptide/collagen induced significant ectopic bone formation compared to that of rat tail collagen alone as a control. Our results indicate collagen served as a good carrier for newly synthesized BMP-2-related peptide and that the BMP-2-related peptide/collagen composite was an effective substitute in bone tissue engineering.

An Automatic Spring-back Compensation Method in Die Design Based on a Genetic Algorithm

Jing Hu,정관수,Xiao-Xing Li,박태준,Guo-Feng Zhou,Rao Yao 대한금속·재료학회 2011 METALS AND MATERIALS International Vol.17 No.3

In the present work, a die shape design method to compensate spring-back in the sheet metal forming process is developed based on a finite element analysis and a genetic algorithm. The proposed method is robust and automated enough for industrial applications. Using a simple stretch bending process as an example,it was demonstrated that the new method optimizes the die profile effectively. The good performance of the die profile optimized utilizing the new method was also verified experimentally, confirming that the new method is likely to be more cost-effective than common design practices in practical applications.

Lactate potentiates angiogenesis and neurogenesis in experimental intracerebral hemorrhage

Jing Zhou,Tao Liu,Hao Guo,Hanjin Cui,Pengfei Li,Dandan Feng,En Hu,Qing Huang,Ali Yang,Jun Zhou,Jiekun Luo,Tao Tang,Yang Wang 생화학분자생물학회 2018 Experimental and molecular medicine Vol.50 No.-

Lactate accumulation has been observed in the brain with intracerebral hemorrhage (ICH). However, the outcome of lactate accumulation has not been well characterized. Here, we report that lactate accumulation contributes to angiogenesis and neurogenesis in ICH. In the first set of the experiment, a rat model of ICH was induced by injecting collagenase into the brain. The effects of lactate accumulation on the neurological function, apoptosis, and numbers of newborn endothelial cells and neurons, as well as the proliferation-associated signaling pathway, were evaluated in the rat brain. In the second set, exogenous L-lactate was infused into intact rat brains so that its effects could be further assessed. Following ICH, lactate accumulated around the hematoma; the numbers of PCNA+/vWF+ nuclei and PCNA+/DCX+ cells were significantly increased compared with the numbers in the Sham group. Moreover, ICH induced translocation of nuclear factor-kappa B (NF-κB) p65 into the nucleus, resulting in a notable upregulation of VEGF and bFGF mRNAs and proteins compared with the levels in the Sham controls. Administration of a lactate dehydrogenase inhibitor dramatically inhibited these effects, decreased the vascular density, and aggravated neurological severity scores and apoptosis after ICH. After exogenous L-lactate infusion, the numbers of PCNA+/vWF+ nuclei and PCNA+/DCX+ cells were strikingly increased compared with the numbers in the Sham controls. In addition, lactate facilitated NF-κB translocation to induce increased transcription of VEGF and bFGF. Co-infusion with an NF-κB inhibitor significantly inhibited these effects. These data suggest that lactate potentiates angiogenesis and neurogenesis by activating the NF-κB signaling pathway following ICH.

Self-microemulsifying Drug Delivery System for Improved Oral Bioavailability of Dipyridamole: Preparation and Evaluation

Feng Guo,Haijun Zhong,Jing He, Baogang Xie,Fen Liu, Helin Xu,Minmin Liu,Chunlian Xu 대한약학회 2011 Archives of Pharmacal Research Vol.34 No.7

Dipyridamole shows poor and variable bioavailability after oral administration due to pHdependent solubility, low biomembrane permeability as well as being a substrate of P-glycoprotein. In order to improve the oral absorption of dipyridamole, a self-microemulsifying drug delivery system (SMEDDS) for dipyridamole was prepared and evaluated in vitro and in vivo. The optimum formulation was 18% oleic acid, 12% Labrafac lipophile WL 1349, 42% Solutol HS 15 and 28% isopropyl alcohol. It was found that the performance of self-microemulsification with the combination of oleic acid and Labrafac lipophile WL 1349 increased compared with just one oil. The results obtained from an in vitro dissolution assay indicated that dipyridamole in SMEDDS dissolved rapidly and completely in pH 6.8 aqueous media, while the commercial drug tablet was less soluble. An oral bioavailability study in rats showed that dipyridamole in the SMEDDS formulation had a 2.06-fold increased absorption compared with the simple drug suspension. It was evident that SMEDDS may be an effective approach to improve the oral absorption for drugs having pH-dependent solubility.