Surface Reconstruction from Gradient Fields Using Box-Spline Kernel

Guodong Wang,Jingbao Yang,Yue Cheng 보안공학연구지원센터 2014 International Journal of Multimedia and Ubiquitous Vol.9 No.5

Erector Spinae Atrophy Correlates with Global Sagittal Imbalance and Postoperative Proximal Junctional Kyphosis Incidence in Lumbar Degenerative Kyphosis

Wang Guodong,Li Yang,Zhang Chenggui,Liu Ping,Sun Jianmin 대한척추외과학회 2024 Asian Spine Journal Vol.18 No.1

Study Design: Retrospective cohort study. Purpose: This study aimed to investigate the relationship between lumbar erector muscle atrophy and global sagittal imbalance in lumbar degenerative kyphosis (LDK) and with postoperative proximal junctional kyphosis. Overview of Literature: Lumbar erector muscle atrophy has been studied in LDK. However, its role in the compensatory mechanism is still under intense discussion, and the role of erector spinae (ES) muscle is always overlooked. Methods: This study enrolled 51 patients with LDK out of 382 patients with adult degenerative spinal deformity. Baseline information was reviewed including demographic data and complications. Sagittal spinopelvic alignments and global imbalance parameters were assessed on full-length X-ray images of the spine. Muscularity and the fatty infiltration area of the ES and multifidus (MF) were measured at the L4/5 level on preoperative magnetic resonance image to evaluate the lumbar erector muscle atrophy. Stratification by sagittal vertical axis (SVA) was performed: group 1 with SVA <100 mm and group 2 with SVA >100 mm, and these groups were compared. Spearman correlation and multivariable logistic regression analyses were performed to analyze and define risk factors of postoperative proximal junctional kyphosis (PJK). Results: Group 2 had lower ES and MF muscularity than group 1. ES muscularity correlated with SVA (r=−0.510, p=0.003), lumbar lordosis (r=−0.415, p=0.018), and postoperative PJK (r=−0.508, p=0.022). MF muscularity did not correlate with the above parameters. Multivariable logistic regression analysis verified ES muscularity (odds ratio [OR], 0.001; p=0.039) and SVA (OR, 1.034; p=0.048) as the risk factors for postoperative PJK. Conclusions: ES atrophy, besides the MF, is an important predictor in distinguishing decompensated LDK from well-compensated ones. It plays an important role in compensatory mechanism, not only correlates with global sagittal imbalance but also ties to PJK after deformity corrective surgery.

Uniaxial Eccentric Load Behavior of L-CFSST Composite Column

Zhen Wang,Zhe Liu,Xingbo Wang,Xuejun Zhou,Zhoutai Wang,Guodong Xian 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.5

This study presents the mechanical behavior of L-shaped concrete-filled square steel tube (L-CFSST) composite columns under uniaxial eccentric compression. Nine specimens were tested and the effects of eccentricity, steel tube thickness, steel yield strength, and slenderness ratio were investigated regarding failure modes, ultimate load, load-lateral displacement curves, and load-strain curves. Test results showed that, under uniaxial eccentric load, these columns showed favorable mechanical properties and steel tubes showed strong cooperative working performance. There were two types of failure modes for these columns: local buckling of the steel tube or overall bending of the specimen. ABAQUS was used to simulate the loading process and the accuracy of the numerical simulation results was verified by comparing failure characteristics, load-displacement curves, and ultimate bearing capacity with the test results. The N/Nu-M/Mu curves of the columns under uniaxial eccentric load with different parameters were simulated by the finite element method. A simplified formula for predicting the N/Nu-M/Mu relationship was established based on the finite element analysis results, which might be a workable approach for designing L-CFSST composite columns in engineering practice.

Recognizing Comparative Sentences from Chinese Review Texts

Wei Wang,TieJun Zhao,GuoDong Xin,YongDong Xu 보안공학연구지원센터 2014 International Journal of Database Theory and Appli Vol.7 No.5

Comparisons play an important role in making decisions by referring to the comparative opinions of opinion holders in earlier customer reviews. Recognizing comparative sentences from review texts contributes to opinion mining and information recommendation. Our objective is to automatically recognize comparative sentences from Chinese text documents. In this paper, an effective approach is proposed based on comparative patterns to recognize comparative sentences in Chinese. Our experiments on customer-generated product reviews show that the proposed approach is effective.

Query Optimization on Large Scale Nested Data with Service Tree and Frequent Trajectory

( Li Wang ),( Guodong Wang ) 한국정보처리학회 2021 Journal of information processing systems Vol.17 No.1

Query applications based on nested data, the most commonly used form of data representation on the web, especially precise query, is becoming more extensively used. MapReduce, a distributed architecture with parallel computing power, provides a good solution for big data processing. However, in practical application, query requests are usually concurrent, which causes bottlenecks in server processing. To solve this problem, this paper first combines a column storage structure and an inverted index to build index for nested data on MapReduce. On this basis, this paper puts forward an optimization strategy which combines query execution service tree and frequent sub-query trajectory to reduce the response time of frequent queries and further improve the efficiency of multi-user concurrent queries on large scale nested data. Experiments show that this method greatly improves the efficiency of nested data query.

A comparative study on antioxidant, anti-inflammatory, antimicrobial activities and chemical composition of Pyrus ussuriensis cultivars from northeastern China

Xiaoqian Wang,Chunyan Liu,Qiang Wang,Chang Liu,Huili Sun,Maojun Zhang,Deguo Lyu,Guodong Du 한국원예학회 2021 Horticulture, Environment, and Biotechnology Vol.62 No.3

Pyrus ussuriensis is the most important cultivated pear in the northeastern, cold areas of China. However, studies on thebiological activity of Pyrus ussuriensis fruit are rare in the public domain. The present study compared antioxidant, antiinflammatory, and antimicrobial activities and chemical composition in tissues from the peel and fl esh of nine Pyrus ussuriensiscultivars. The chemical composition diff ered among cultivars and tissue sources. Phenolics were predominant in peelsamples, whereas sugars were predominant in fl esh samples. Twenty-one phenolic compounds were identifi ed and quantifi ed,including hydroxycinnamic acids, hydroquinones, fl avanols, fl avonols, fl avones, and anthocyanins (only in peel samples). The total phenolic content ranged between 363.0 and 1734.0 mg kg − 1 FW in the peel and from 28.5 to 182.3 mg kg − 1 FWin the fl esh. In addition, cultivars with high total phenolic and fl avonoid contents had signifi cantly higher antioxidant activities. The in vitro anti-infl ammatory study, performed using an egg albumin denaturation assay, demonstrated that both peeland fl esh samples had strong activity, which was comparable with that of the standard anti-infl ammatory drug diclofenacsodium. The antimicrobial results showed that ‘Jianba’ and ‘Balixiang’ cultivars exhibited strong activity against bacteriastrains in the peel and fl esh, respectively. The present study provided information for selecting promising Pyrus ussuriensiscultivars with improved health benefi ts.

Colorimetric and Fluorometric Assays Based on Conjugated Polydiacetylene Supramolecules for Screening Acetylcholinesterase and Its Inhibitors

Zhou, Guodong,Wang, Fang,Wang, Huilin,Kambam, Srinivasulu,Chen, Xiaoqiang,Yoon, Juyoung American Chemical Society 2013 ACS APPLIED MATERIALS & INTERFACES Vol.5 No.8

<P>Polydiacetylene supramolecules (PDAs) are unique sensing materials. Upon environmental stimulation, blue PDAs can undergo a colorimetric transition from blue to red accompanied by fluorescence enhancement. In this paper, we report a new PDA system polymerized from a mixed liposome comprising 2-(2-(2-hydroxyethoxy)ethoxy)ethyl pentacosa-10,12-diynoate and pentacosa-10,12-diynoic acid at a 3:7 ratio. The PDA system provided new colorimetric and fluorometric assay methods for screening acetylcholinesterase and its inhibitors through three processes. First, myristoylcholine reacted with PDAs, which then underwent colorimetric and fluorometric transition. Second, acetylcholinesterase catalyzed the hydrolysis of myristoylcholine into tetradecanoic acid, which reduced the myristoylcholine concentration and led to faded color and fluorescence. Third and last, acetylcholinesterase inhibitors retarded the activity of acetylcholinesterase, thereby inducing the recovery of color and fluorescence.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2013/aamick.2013.5.issue-8/am400260y/production/images/medium/am-2013-00260y_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am400260y'>ACS Electronic Supporting Info</A></P>

A Parameter Selection Method for Multi-Element Resonant Converters with a Resonant Zero Point

Wang, Yifeng,Yang, Liang,Li, Guodong,Tu, Shijie The Korean Institute of Power Electronics 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.2

This paper proposes a parameter design method for multi-element resonant converters (MERCs) with a unique resonant zero point (RZP). This method is mainly composed of four steps. These steps include program filtration, loss comparison, 3D figure fine-tuning and priority compromise. It features easy implementation, effectiveness and universal applicability for almost all of the existing RZP-MERCs. Meanwhile, other design methods are always exclusive for a specific topology. In addition, a novel dual-CTL converter is also proposed here. It belongs to the RZP-MERC family and is designed in detail to explain the process of parameter selection. The performance of the proposed method is verified experimentally on a 500W prototype. The obtained results indicate that with the selected parameters, an extensive dc voltage gain is obtained. It also possesses over-current protection and minimal switching loss. The designed converter achieves high efficiencies among wide load ranges, and the peak efficiency reaches 96.9%.

Effects of high-temperature stress and heat shock on two root maggots, Bradysia odoriphaga and Bradysia difformis (Diptera: Sciaridae)

Guodong Zhu,Yin Luo,Ming Xue,Haipeng Zhao,NanNan Xia,Xinhui Wang 한국응용곤충학회 2018 Journal of Asia-Pacific Entomology Vol.21 No.1

Bradysia odoriphaga and B. difformis (Diptera: Sciaridae) are devastating pests of vegetables, ornamentals andedible mushrooms. In Chinese chive fields, the two Bradysia species occur with similar regularities: outbreaks inspring and autumn, and population decreases in summer. Temperature may be an important factor restrictingtheir population abundance in summer. Here, we performed a life-table study under constant high temperaturesand assessed the tolerance of two Bradysia species to heat shock. Life parameters of the Bradysia species indicatedslow developmental rates, and low survival rates and fecundity, when the temperature was higher than 30 °C. At34 °C, individuals were unable to reach the adult stages from eggs. Moreover, temperatures above 36 °C showedlethal effects, decreasing their survival rates. The median lethal time (LT50) values of 4th instar B. odoriphagaand B. difformis larvae were 46.82 and 32.97 h, respectively, while the values at 38 °C were 2.12 and 1.51 h,respectively. The 4th instar larvae and pupae possessed higher thermotolerance levels than adults and eggs,indicating sensitivities to heat stress. Moreover, B. odoriphaga was more thermotolerant than B. difformis. Thus,weak thermotolerance levels may restrict their occurrences during the period of summer heat, and the differencein thermotolerance levels between the two species may be related to their regional distributions.

Synthesis and Characterization of Cobalt-Doped WS ₂ Nanorods for Lithium Battery Applications

Wang, Shiquan,Li, Guohua,Du, Guodong,Li, Li,Jiang, Xueya,Feng, Chuanqi,Guo, Zaiping,Kim, Seungjoo Springer 2010 NANOSCALE RESEARCH LETTERS Vol.5 No.8

<P>Cobalt-doped tungsten disulfide nanorods were synthesized by an approach involving exfoliation, intercalation, and the hydrothermal process, using commercial WS<SUB>2</SUB> powder as the precursor and <I>n</I>-butyllithium as the exfoliating reagent. XRD results indicate that the crystal phase of the sample is 2H-WS<SUB>2</SUB>. TEM images show that the sample consists of bamboo-like nanorods with a diameter of around 20 nm and a length of about 200 nm. The Co-doped WS<SUB>2</SUB> nanorods exhibit the reversible capacity of 568 mAh g<SUP>−1</SUP> in a voltage range of 0.01–3.0 V versus Li/Li<SUP>+</SUP>. As an electrode material for the lithium battery, the Co-doped WS<SUB>2</SUB> nanorods show enhanced charge capacity and cycling stability compared with the raw WS<SUB>2</SUB> powder.</P>