Reliable Robust Control for Semi-Markovian Jump Sampled-data Systems Based on a Dissipativity Unified Framework

Yutong Zhang,Yuechao Ma,Lei Fu,Wenying Zhao 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.8

This paper is concerned with the reliable robust control for semi-Markovian jump sampled-data systems. A mode-dependent Lyapunov-Krasovskii function (LKF) which fully capture the available characteristics of real sampling period is constructed. Based on the LKF approach, Newton-Leibniz condition and convex combination method, less conservative sufficient conditions are presented, which ensure that the closed-loop systems are robust asymptotically stable and extended-dissipativity. Then, actuator failures are taken into consideration, the desired sampled-data controller can be obtained by solving the linear matrix inequalities (LMIs). Finally, two numerical examples are given to illustrate the effectiveness of the proposed method.

Reference Intervals for Thyroid-Associated Hormones and the Prevalence of Thyroid Diseases in the Chinese Population

Zou Yutong,Wang Danchen,Cheng Xinqi,Ma Chaochao,Lin Songbai,Hu Yingying,Yu Songlin,Xia Liangyu,Li Honglei,Yin Yicong,Liu Huaicheng,Zhang Dianxi,Zhang Kui,Lian Xiaolan,Xu Tengda,Qiu Ling 대한진단검사의학회 2021 Annals of Laboratory Medicine Vol.41 No.1

Background: Thyroid diseases are highly prevalent worldwide, but their diagnosis remains a challenge. We established reference intervals (RIs) for thyroid-associated hormones and evaluated the prevalence of thyroid diseases in China. Methods: After excluding outliers based on the results of ultrasound screening, thyroid antibody tests, and the Tukey method, the medical records of 20,303 euthyroid adults, who visited the Department of Health Care at Peking Union Medical College Hospital from January 2014 to December 2018, were analyzed. Thyroid-associated hormones were measured by the Siemens Advia Centaur XP analyzer. The RIs for thyroid-associated hormones were calculated according to the CLSI C28-A3 guidelines, and were compared with the RIs provided by Siemens. The prevalence of thyroid diseases over the five years was evaluated and compared using the chi-square test. Results: The RIs for thyroid stimulating hormone (TSH), free thyroxine (FT4), free triiodothyronine (FT3), total thyroxine (TT4), and total triiodothyronine (TT3) were 0.71–4.92 mIU/L, 12.2–20.1 pmol/L, 3.9–6.0 pmol/L, 65.6–135.1 nmol/L, and 1.2–2.2 nmol/L, respectively. The RIs of all hormones except TT4 differed significantly between males and females. The RIs of TSH increased with increasing age. The prevalence of overt hypothyroidism, overt hyperthyroidism, subclinical hypothyroidism, and subclinical hyperthyroidism was 0.5% and 0.8%, 0.2% and 0.6%, 3.8% and 6.1%, and 3.3% and 4.7% in males and females, respectively, which differed from those provided by Siemens. Conclusions: Sex-specific RIs were established for thyroid-associated hormones, and the prevalence of thyroid diseases was determined in the Chinese population.

Design of an Optical System for a Space Target Detection Camera

Liu Zhang,Jiakun Zhang,Jingwen Lei,Yutong Xu,Xue-Ying Lv 한국광학회 2022 Current Optics and Photonics Vol.6 No.4

In this paper, the details and design process of an optical system for space target detection cameras are introduced. The whole system is divided into three structures. The first structure is a short-focus vis-ible light system for rough detection in a large field of view. The field of view is 2°, the effective focallength is 1,125 mm, and the F-number is 3.83. The second structure is a telephoto visible light systemfor precise detection in a small field of view. The field of view is 1°, the effective focal length is 2,300mm, and the F-number is 7.67. The third structure is an infrared light detection system. The field ofview is 2°, the effective focal length is 390 mm, and the F-number is 1.3. The visible long-focus narrowfield of view and visible short-focus wide field of view are switched through a turning mirror. Design results show that the modulation transfer functions of the three structures of the system are close to the diffraction limit. It can further be seen that the short-focus wide-field-of-view distortion is controlledwithin 0.1%, the long-focus narrow-field-of-view distortion within 0.5%, and the infrared subsystem distortion within 0.2%. The imaging effect is good and the purpose of the design is achieved.

Antimicrobial and Cytotoxic Activity of Endophytic Fungi from Lagopsis supina

Zhang Dekui,Sun Weijian,Xu Wenjie,Ji Changbo,Zhou Yang,Sun Jingyi,Tian Yutong,Li Yanling,Zhao Fengchun,Tian Yuan 한국미생물·생명공학회 2023 Journal of microbiology and biotechnology Vol.33 No.4

In this study, five endophytic fungi belonging to the Aspergillus and Alternaria genera were isolated from Lagopsis supina. The antimicrobial activity of all fungal fermented extracts against Staphylococcus and Fusarium graminearum was tested using the cup-plate method. Among them, Aspergillus ochraceus XZC-1 showed the best activity and was subsequently selected for large-scale fermentation and bioactivity-directed separation of the secondary metabolites. Four compounds, including 2- methoxy-6-methyl-1,4-benzoquinone (1), 3,5-dihydroxytoluene (2), oleic acid (3), and penicillic acid (4) were discovered. Here, compounds 1 and 4 displayed anti-fungal activity against F. graminearum, F. oxysporum, F. moniliforme, F. stratum, Botrytis cinerea, Magnaporthe oryzae, and Verticillium dahliae with diverse MIC values (128–512 μg/ml), which were close to that of the positive control antifungal, actidione (64–128 μg/ml). Additionally, compounds 1 and 4 also exhibited moderate antibacterial activity against S. aureus, Listeria monocytogenes, Escherichia coli, and Salmonella enterica, with low MIC values (8–64 μg/ml). Moreover, compounds 1 and 4 displayed selective cytotoxicity against cancer cell lines as compared with the normal fibroblast cells. Therefore, this study proposes that the endophytic fungi from L. supina can potentially produce bioactive molecules to be used as lead compounds in drugs or agricultural antibiotics.

Investigation on the Use of GPGPU for Fast Sparse Matrix Factorization

Tian, Ye,Zhou, Bin,Zhang, YuTong,Chan, Ka Wing The Korean Institute of Electrical Engineers 2011 The Journal of International Council on Electrical Vol.1 No.1

Solution for network equations is frequently encountered by power system researchers. With the increasingly larger system size, time consumed network solution is becoming a dominant factor in the overall time cost. One distinct and important feature of the network admittance matrix is that it is highly sparse, which need to be addressed by specialized computation techniques. One technique to accelerate matrix factorization is parallel computation, with which data processing can be divided into different tasks and implemented simultaneously. However, up to now, efficiency of parallel computation algorithm implemented on multi-processor systems is adversely affected by the data communication latency between processors. In this paper, by taking advantage of the parallel computing power of the contemporary Graphic Processing Units (GPU) and designs of sparse technique for matrix factorization implemented on GPU, proposed algorithms are implemented and evaluated on the Computer Unified Device Architecture (CUDA) interface of the NVIDIA GPU. Preliminary results show significant improvement of speed of LU factorization.

Complete genome sequence of the Pogostemon cablin bacterial wilt pathogen Ralstonia solanacearum strain SY1

Sun Yunhao,Su Yutong,Hussain Ansar,Xiong Lina,Li Chunji,Zhang Jie,Meng Zhen,Dong Zhangyong,Yu Guohui 한국유전학회 2023 Genes & Genomics Vol.45 No.1

Background Ralstonia solanacearum causes bacterial wilt of Pogostemon cablin which is an important aromatic herb and also the main materials of COVID-19 therapeutic traditional drugs. However, we are lacking the information on the genomic sequences of R. solanacearum isolated from P. cablin. Objective The acquisition and analysis of this whole-genome sequence of the P. cablin bacterial wilt pathogen. Methods An R. solanacearum strain, named SY1, was isolated from infected P. cablin plants, and the complete genome sequence was sequenced and analyzed. Results The SY1 strain contains a 3.70-Mb chromosome and a 2.18-Mb megaplasmid, with GC contents of 67.57% and 67.41%, respectively. A total of 3308 predicted genes were located on the chromosome and 1657 genes were located in the megaplasmid. SY1 strain has 273 unique genes compared with five representative R. solanacearum strains, and these genes were enriched in the plant–pathogen interaction pathway. SY1 possessed a higher syntenic relationship with phylotype I strains, and the arsenal of type III effectors predicted in SY1 were also more closely related to those of phylotype I strains. SY1 contained 14 and 5 genomic islands in its chromosome and megaplasmid, respectively, and two prophage sequences in its chromosome. In addition, 215 and 130 genes were annotated as carbohydrate-active enzymes and antibiotic resistance genes, respectively. Conclusion This is the first genome-scale assembly and annotation for R. solanacearum which isolated from infected P. cablin plants. The arsenal of virulence and antibiotic resistance may as the determinants in SY1 for infection of P. cablin plants.