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MODIFIED BOTTLENECK-BASED PROCEDURE FOR LARGE-SCALE FLOW-SHOP SCHEDULING PROBLEMS WITH BOTTLENECK

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Chinese Journal of Mechanical Engineering 2006年第3期19卷 356-361页

作者： ZUO yan GU Hanyu xi Yugeng Institute of Automation Shanghai Jiaotong University Shanghai 200240 China

A new bottleneck-based heuristic for large-scale flow-shop scheduling problems with a bottleneck is proposed, which is simpler but more tailored than the shifting bottleneck （SB） procedure. In this algorithm, a schedule for the bottleneck machine is first constructed optimally and then the non-bottleneck machines are scheduled around the bottleneck schedule by some effective dispatching rules. Computational results show that the modified bottleneck-based procedure can achieve a tradeoff between solution quality and computational time comparing with SB procedure for medium-size problems. Furthermore it can obtain a good solution in quite short time for large-scale scheduling problems.

关键词： Flow-shop scheduling problem Heuristic Bottleneck machine

Comparison of 5-hydroxytryptophan signaling pathway characteristics in diarrhea-predominant irritable bowel syndrome and ulcerative colitis

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World Journal of Gastroenterology 2016年第12期22卷 3451-3459页

作者： Feng-yan Yu Shao-Gang Huang Hai-yan Zhang Hua Ye Hong-Gang Chi Ying Zou ru-xi Lv Xue-Bao Zheng Traditional Chinese Medicine Institute Guangdong Medical University Dongguan 524023 Guangdong Province China University City Branch Hospital of Guangdong Provincial Hospital of Traditional Chinese Medicine Guangzhou 510006 Guangdong Province China Guangdong Key Laboratory of Natural Medicine Research and Development Guangdong Medical College Zhanjiang 524023 Guangdong Province China

AIM: To study differences in the visceral sensitivity of the colonic mucosa between patients with diarrheapredominant irritable bowel syndrome(IBS-D) and those with ulcerative colitis(UC) in remission and to relate these differences with changes in the 5-hydroxytryptophan(5-HT) signaling pathway. METHODS: Gastrointestinal symptoms were used to determine the clinical symptom scores and rectal visceral sensitivity of patients with IBS-D and patients with UC in remission. Blood levels of 5-HT and5-hydroxyindoleacetic acid(5-HIAA) were measured using an HPLC-electrochemical detection system. The levels of 5-HT 3 receptor(3R), 4R, and 7R m RNAs in colonic biopsy samples were detected using reverse transcription-polymerase chain reaction. The protein expression of TPH1 was analyzed by Western blot and ***: Abdominal pain or discomfort, stool frequency, and the scores of these symptoms in combination with gastrointestinal symptoms were higher in the IBS-D and UC groups than in the control groups. However, no significant differences were observed between the IBS-D and UC remission groups. With respect to rectal visceral sensitivity, the UC remission and IBS-D groups showed a decrease in the initial perception threshold, defecating threshold and pain threshold. However, these groups exhibited significantly increased anorectal relaxation pressure. Tests examining the main indicators of the 5-HT signaling pathway showed that the plasma 5-HT levels, 5-HIAA concentrations, TPH1 expression in the colonic mucosa, and 5-HT3 R and 5-HT5 R expression were increased in both the IBS-D and the UC remission groups; no increases were observed with respect to 5-HT7 R ***: The IBS-D and UC groups showed similar clinical symptom scores, visceral sensitivity, and levels of serotonin signaling pathway indicators in the plasma and colonic mucosa. However, the pain threshold and 5-HT7 R expression in the colonic mucosa were significantly different betwe

关键词： Stomach type diarrhea Diarrhea-predominant irritable bowel syndrome Ulcerative colitis in remission 5-Hydroxytryptophan

Numerical simulation of pedestrian flow past a circular obstruction

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Acta Mechanica Sinica 2011年第2期27卷 215-221页

作者： yan-Qun Jiang ru-Xun Liu Ya-Li Duan Department of Mathematics Southwest University of Science and Technology 621010 Mianyang China Department of Mathematics University of Science and Technology of China 230026 Hefei China

In this paper, a revisiting Hughes’ dynamic continuum model is used to investigate and predict the essential macroscopic characteristics of pedestrian flow, such as flow, density and average speed, in a two dimensional continuous walking facility scattered with a circular obstruction. It is assumed that pedestrians prefer to walk a path with the lowest instantaneous travel cost from origin to destination, under the consideration of the current traffic conditions and the tendency to avoid a high-density region and an obstruction. An algorithm for the pedestrian flow model is based on a cellcentered finite volume method for a scalar conservation law equation, a fast sweeping method for an Eikonal-type equation and a second-order TVD runge-Kutta method for the time integration on unstructured meshes. Numerical results demonstrate the effectiveness of the algorithm. It is verified that density distribution of pedestrian flow is influenced by the position of the obstruction and the path-choice behavior of pedestrians.

关键词： Pedestrian flow · Continuum model ·Finite volume method · Unstructured meshes · Obstruction

New design of large fully-steerable radio telescope reflector based on homogenized mesh structure

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Research in Astronomy and Astrophysics 2021年第10期21卷 27-36页

作者： Li-De yan Fei Zheng xi rui School of Mechano-Electronic Engineering Xidian UniversityXi'an 710071China

The self-weight of a large fully-steerable radio telescope is one of the important factors affecting its *** the existing reflector system scheme,the problem of surface accuracy caused by its large and heavy structure has seriously restricted the application and implementation of large radio ***,a new mesh structure scheme for a large fully-steerable radio telescope reflector is proposed in this *** scheme is based on a homogenized mesh back-up structure in the form of a quasi-geodesic grid and regular quasi-tri-prism or tetrahedron,which can significantly reduce the structural complexity and self-weight of the reflector under the condition that the reflector can meet the desired performance ***,the feasibility and rationality of the scheme are evaluated by numerical simulation analysis,which has significant advantages and provides a new design for the reflector of a large fullysteerable radio telescope.

关键词： telescopes techniques:radar astronomy methods:data analysis

Stabilization and trajectory tracking of autonomous airship's planar motion

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Journal of Systems Engineering and Electronics 2008年第5期19卷 974-981页

作者： Zhang yan Qu Weidong xi Yugeng Cai Zili Dept. of Automation Shanghai Jiaotong Univ. Shanghai 200240 P. R. China GE (China) Research and Development Center Co. Ltd Shanghai 201203 P. R. China

The stabilization and trajectory tracking problems of autonomous airship＇s planar motion are studied. By defining novel configuration error and velocity error, the dynamics of error systems are derived. By applying Lyapunov stability method, the state feedback control laws are designed and the close-loop error systems are proved to be uniformly asymptotically stable by Matrosov theorem. In particular, the controller does not need knowledge on system parameters in the case of set-point stabilization, which makes the controller robust with respect to parameter uncertainty. Numerical simulations illustrate the effectiveness of the controller designed.

关键词： airship planar motion stabilization trajectory tracking robustness Lyapunov stability Matrosov theorem.

THE SOLVABILITY CONDITIONS FOR THE INVERSE PROBLEM OF BISYMMETRIC NONNEGATIVE DEFINITE MATRICES

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Journal of Computational Mathematics 2000年第6期18卷 597-608页

作者： Dong-xiu xie Lei Zhang xi-yan Hu Department of Applied Mathematics Dalian University of TechnologyDalian 116023China Department of Applied Mathematics Hunan UniversityChangsha 410082China Hunan Computing Center Changsha 410012China

A = (a[sub ij]) ∈ R[sup n×n] is termed bisymmetric matrix if a[sub ij] = a[sub ji] = a[sup n ? j + 1, n ? i + 1], i, j = 1, 2 ··· n. We denote the set of all n x n bisymmetric matrices by BSR[sup n x n]. This paper is mainly concerned with solving the following two problems: Problem I. Given X, B ∈ R[sup n×m], find A ∈ P[sub n] such that AX = B, where P[sub n] = {A ∈ BSR[sup n×n]| x[sup T] Ax ≥ 0, ?x ∈ R[sup n]}. Problem II. Given A[sup *] ∈ R[sup n×n], find ? ∈ S[sub E] such that ||A[sup *] - ?||[sub F] = ... ||A[sup *] - A||[sub F] where || · ||[sub F] is Frobenius norm, and S[sub E] denotes the solution set of problem I. The necessary and sufficient conditions for the solvability of problem I have been studied. The general form of S[sub E] has been given. For problem II the expression of the solution has been provided. [ABSTRACT FROM AUTHOR]

关键词： Frobenius norm bisymmetric matrix the optimal solution

Analyses for specific defects in Android applications:a survey

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Frontiers of Computer Science 2019年第6期13卷 1210-1227页

作者： Tianyong WU xi DENG Jun yan Jian ZHANG State Key Laboratory of Computer Science Institute of SoftwareChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Technology Center of Software Engineering Institute of SoftwareChinese Academy of SciencesBeijing 100190China

Android applications(APPS)are in widespread use and have enriched our *** ensure the quality and security of the apps,many approaches have been proposed in recent years for detecting bugs and defects in the apps,of which program analysis is a major *** paper mainly makes an investigation of existing works on the analysis of Android *** summarize the purposes and proposed techniques of existing approaches,and make a taxonomy of these works,based on which we point out the trends and challenges of research in this *** our survey,we sum up four main findings:(1)program analysis in Android security field has gained particular attention in the past years,the fields of functionality and performance should also gain proper attention;the infrastructure that supports detection of various defects should be enriched to meet the industry’s need;(2)many kinds of defects result from developers’misunderstanding or misuse of the characteristics and mechanisms in Android system,thus the works that can systematically collect and formalize Android recommendations are in demand;(3)various program analysis approaches with techniques in other fields are applied in analyzing Android apps;however,they can be improved with more precise techniques to be more applicable;(4)The fragmentation and evolution of Android system blocks the usability of existing tools,which should be taken into consideration when developing new approaches.

关键词： Android apps program analysis security functionality performance

A novel epoxy methacrylate resin containing phthalazinone moiety for UV coatings

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Chinese Chemical Letters 2007年第5期18卷 598-600页

作者： yan Kou Jin yan Wang xi Gao Jian Department of Polymer Science and Materials Dalian University of TechnologyLiaoning High Performance Resin Engineering Research Center Dalian 116012 China

A novel ohthalazinone modified epoxy acrylate resin for the high temperature resistant ultravioet （UV） curable *** *** methacrylated epoxy resins obtained were utilized to UV radiation curing by taking 2.5% （wt%） of photoinitiator in combination with 20% （wt%） of diluent, and generated the interpenetraring polymer networks. The cured film had good thermal and chemical stability.

关键词： UV curable Epoxy acrylate Phthalazione Crosslinking

Imperative for long-term management and surveillance in Kawasaki disease

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World Journal of Clinical Cases 2025年第4期13卷 61-63页

作者： yan Pan Fu-Yong Jiao Department of Pediatrics The First Affiliated Hospital of Yangtze UniversityJingzhou 434000Hubei ProvinceChina Shaanxi Kawasaki Disease Diagnosis and Treatment Center Children’s HospitalShaanxi Provincial People’s Hospital of Xi’an Jiaotong UniversityXi’an 710000Shaanxi ProvinceChina

Kawasaki disease(KD)is a significant pediatric vasculitis known for its potential to cause severe coronary artery *** the effectiveness of initial treatments,such as intravenous immunoglobulin,KD patients can experience long-term cardiovascular issues,as evidenced by a recent case report of an adult who suffered a ST-segment elevation myocardial infarction due to previous KD in the World Journal of Clinical *** editorial emphasizes the critical need for long-term management and regular surveillance to prevent such *** drawing on recent research and case studies,we advocate for a structured approach to follow-up care that includes routine cardiac evaluations and preventive measures.

关键词： Kawasaki disease Long-term management Coronary artery aneurysm Surveillance Preventive care