LFT Modeling and Robust Stability Analysis of Missiles with Uncertain Parameters

HOU Zhen-qian,LIANG Xiao-geng,WANG Wen-zheng,LI Rui 한국항공우주학회 2014 International Journal of Aeronautical and Space Sc Vol.15 No.2

The structured singular value (μ) analysis based method has many advantages for the robust stability analysis of missiles with uncertain parameters. Nevertheless, the present linear fractional transformation (LFT) modeling process, which is the basis of μ analysis, is complex, and not suitable for automatic implementation; on the other hand, μ analysis requires a large amount of computation, which is a burden for large-scale application. A constructive procedure, which is computationally more efficient, and which may lead to a lower order realization than existing algorithms, is proposed for LFT modeling. To reduce the calculation burden, an analysis method is developed, based on skew μ. On this basis, calculation of the supremum of μ over a fixed frequency range converts into a single skew μ value calculation. Two algorithms are given, to calculate the upper and lower bounds of skew μ, respectively. The validity of the proposed method is verified through robust stability analysis of a missile with real uncertain parameters.

Microbial transformation of ginsenoside Rg3 to ginsenoside Rh2 by Esteya vermicola CNU 120806.

Hou, Jingang,Xue, Jianjie,Wang, Chunyan,Liu, Lei,Zhang, Dongliang,Wang, Zhen,Li, Wei,Zheng, Yinan,Sung, Changkeun Springer 2012 World journal of microbiology biotechnology Vol.28 No.4

<P>In the present investigation, we successfully employed a cell-free extract of Esteya vermicola CNU 120806 to convert ginsenoside Rg3 to Rh2. Three important factors including pH, temperature and substrate concentration were optimized for the preparation of Rh(2). The optimal condition was obtained as follows: 50C, pH 5.0 and substrate concentration of 3 mg ml(-1). The yield of conversion was up to 90.7%. In order to identify the specificity of the β-glucosidase activity of Esteya vermicola CNU 120806, ginsenoside Re (protopanaxatriol saponins) was treated under the same reaction system. Interestingly, no new metabolite was generated, which elucidated that the enzymatic process only occurred by hydrolysis of the terminal glucopyranosyl moieties at the C-3 carbon of ginsenoside Rg(3). The crude enzyme extract can be used for commercial ginsenoside Rh(2) preparation.</P>

Transcriptome-wide identification of WRKY transcription factor and their expression profiles under salt stress in sweetpotato (Ipomoea batatas L.)

Qin Zhen,Hou Fuyun,Li Aixian,Dong Shuxu,Wang Qingmei,Zhang Liming 한국식물생명공학회 2020 Plant biotechnology reports Vol.14 No.5

WRKY transcription factors play a key role in regulating plant growth, development, and stress responses. Although many WRKY transcription factors have been discovered in plants, the WRKY transcription factors in sweetpotato have not been systematically studied. Here, we identifed 79 IbWRKY transcription factors based on the transcriptome data of sweetpotato. The amino acid length of the protein ranged from 162 to 711 amino acids. Frequency analysis of amino acids in IbWRKY transcription factors found highest levels of serine. Subcellular localization analysis found 77 IbWRKY proteins localized in the nucleus. The IbWRKY proteins were clustered into three groups based on their structural and phylogenetic characteristics. Seven WRKY proteins contained the WRKY domain variations WRKYG(K/T)K as revealed by multiple sequence alignment. Structural analysis showed that IbWRKY proteins of the same subfamily had similar motifs. Transcriptome data analysis found that a total of 35 IbWRKY genes showed signifcant changes of the expression level after the 150 mM NaCl treatment. We selected 16 IbWRKY genes for real-time quantitative PCR verifcation and found that the data were consistent with the transcriptome data. In summary, this study provides a systematical analysis of the IbWRKY transcription factors, which will lay a solid foundation for further characterization of the regulatory mechanism of the IbWRKY genes under salt stress in sweetpotato.

Distinct bacterial community of a solid-state fermented Chinese traditional food huase sufu revealed by high-throughput sequencing

Zhang Zhen-dong,Wang Yu-rong,Xiang Fan-shu,Hou Qiang-chuan,Guo Zhuang 한국식품과학회 2021 Food Science and Biotechnology Vol.30 No.9

Sufu is a common solid-state traditional fermentedfood made from soybean. Huase sufu is a typicaltype found in several provinces of China, especially inHubei. However, little is known about the bacterial community. High-throughput sequencing technology revealedthat the dominant taxa at phylum level were: Firmicutes,Proteobacteria and Bacteroides, and at the genus levelwere: Pseudomonas, Lactococcus, Acinetobacter, etc. Additionally, LEfSe revealed that compared with the bacterialcommunity of red sufu and white sufu, the biomarkergenera for both huase sufu were Enterococcus, and Myroides. Moreover, there were twenty-eight hubs for thehuase sufu samples, and four of them were dominantgenera: Citrobacter, Myroides, Vagococcus, and Enterococcus. These results provide a new insight into ourunderstanding of the bacterial diversity of huase sufu, andwill facilitate the isolation, screening, and developmentpotential bacterial strains for production of huase sufu.

Joint Analysis of Port and Protocol via Endpoint Measurement: An Empirical Study

Chengshang Hou,Gaopeng Gou,Gang Xiong,Zhen Li 한국통신학회 2020 한국통신학회 APNOMS Vol.2020 No.09

As network services continuously evolving, accurately classifying traffic is important for network operators to optimize QoS and customize policy. Network service uses non-standard ports and protocol obfuscation causing damage to the accurate port-based and payload-based traffic classification. However, Deep Packet Inspection (DPI) technique, which combines the payload-based method and port-based method, is still adopted by practitioners from the academic and industrial community. In this paper, we investigate the DPI classification result on a large network to estimate the impact of two factors. We qualify the popularity of non-standard port among different protocols. By endpoint filtering, we discover a large proportion of non-standard ports are opened temporally. We show there still is strong association between P2P protocols and camouflaged protocol. In particular, using both host and label association between endpoints, we find camouflaged protocols exhibit an abnormal port span that is different with the original protocol and are similar to the port span of P2P protocols.

An Integrated Multi-Form Mail System

Guo Zhen Sheng,Gregory Sun Kuan Jeong,Joao Baptista Siu,Kenneth Ho Leong Hou 대한전자공학회 1996 ITC-CSCC :International Technical Conference on Ci Vol.- No.-

Room temperature ferromagnetism in Ni-doped ZnO films

Deng-Lu Hou,Rui-Bin Zhao,Yan-Yan Wei,Cong-Mian Zhen,Cheng-Fu Pan,Gui-De Tang 한국물리학회 2010 Current Applied Physics Vol.10 No.1

Zn1-xNixO (x = 0.02, 0.03, 0.04, 0.05, 0.07) films were prepared using magnetron sputtering. X-ray diffraction indicates that all samples have a wurtzite structure with c-axis orientation. X-ray photoelectron spectroscopy results reveal that the Ni ion is in a +2 charge state in these films. Magnetization measurements indicate that all samples have room temperature ferromagnetism. In order to elucidate the origin of the ferromagnetism, Zn0.97Ni0.03O films were grown under different atmospheric ratios of argon to oxygen. The results show that as the fraction of oxygen in the atmosphere decreases, both the saturation magnetization and the number of oxygen vacancies increase, confirming that the ferromagnetism is correlated with the oxygen vacancy level.

Associations of ABCB1 and XPC Genetic Polymorphisms with Susceptibility to Colorectal Cancer and Therapeutic Prognosis in a Chinese Population

Yue, Ai-Min,Xie, Zhen-Bin,Zhao, Hong-Feng,Guo, Shu-Ping,Shen, Yu-Hou,Wang, Hai-Pu Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.5

Associations between ABCB1 and XPC genetic polymorphisms and risk of developing colorectal cancer (CRC) as well as clinical outcomes in CRCs with chemotherapy were investigated. A case-control study was performed on the ABCB1 C3435T, G2677T/A and XPC Lys939Gln polymorphisms in 428 CRC cases and 450 hospitalbased, age and sex frequency-matched controls using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) assays. We observed that the ABCB1 3435CT or CC+CT variants were significantly linked with increasing risk of developing CRC (adjusted OR (95% CI): 1.814 (1.237-2.660), P=0.0022; adjusted OR (95% CI): 1.605 (1.117-2.306), P=0.0102, respectively). Moreover, the distribution frequency of XPC AC genotype or AC+CC genotypes also showed a tendency towards increasing the suscepbility for CRC (P=0.0759 and P=0.0903, respectively). Kaplan-Meier curves showed that the ABCB1 C3435T variant was associated with a tendency toward longer progression-free survival (PFS) (n=343, Log-rank test: P=0.063), and the G2677T/A variant genotypes (GT+TT+GA+AA) with a tendency for longer OS in postoperative oxaliplatin-based patients (n=343, Log-rank test: P=0.082). However, no correlation of the XPC Lys939Gln polymorphism was found with PFS and OS in patients with postoperative oxaliplatin-based chemotherapy (n=343). Our study indicated that ABCB1 polymorphisms might be candidate pharmacogenomic factors for the prediction of CRC susceptibility, but not for prognosis with oxaliplatin chemosensitivity in CRC patients.

Experimental study on the injection and spray characteristics of biodiesel and diesel fuel within a common rail system

( Hao Yue Zhu ),( Zhen Huang ),( Jin Xiao ),( Jun Xing Hou ) 한국액체미립화학회 2010 한국액체미립화학회 학술강연회 논문집 Vol.2010 No.-

In this paper, the injection characteristics and macroscopic spray behavior of biodiesel and diesel fuel within a common rail system are investigated. The injection rate is measured with Bosch method, spray visualization system is employed to study the macroscopic spray characteristics of both fuels. The results show that the injection delays of biodiesel and diesel are almost the same. Comparing to diesel, injection duration of biodiesel is a little longer and injection fuel quantity is a little larger. The macroscopic spray result shows, with increased injection pressure, the tip penetration of biodiesel becomes longer and the spray cone angle becomes larger. When ambient pressure increases, the injection tip penetration becomes shorter and the spray cone angle becomes larger. Comparing to diesel, injection tip penetration of biodiesel is longer and spray cone angle is smaller, because the kinematic viscosity and surface tension of biodiesel are larger than those of diesel. The difference of spray characteristics of both fuels is no longer obvious under higher injection pressure. With increased ambient pressure, the difference of spray tip penetration of both fuels becomes larger, and the difference of spray cone angle become smaller.

ELECTRONIC STRUCTURES AND TRANSPORT PROPERTIES OF SINGLE CRYSTALLINE GaN NANOTUBES

ENLING LI,LIPING HOU,ZHEN CUI,DANNA ZHAO,MANCANG LIU,XUEWEN WANG 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2012 NANO Vol.7 No.3

The electronic structures and transport properties of single crystalline GaN nanotubes with 0.92nm inner diameter and di®erent wall thicknesses of 0.08 nm, 0.26 nm and 0.54 nm are studied based on the generalized gradient approximation (GGA) of density functional theory (DFT) and the nonequilibrium green's function (NEGF). The research shows that (1) the three single crystalline GaN nanotubes have direct band gaps, decreasing with the increase of wall thickness;(2) the electronic density of state and electronic transmission spectra of two-probe system have their own pulse-type sharp peaks with almost the same location of electron energy; (3) under di®erent bias-voltages, two-probe systems of the single crystalline GaN nanotubes have the I?V properties which reveal that the single-wall GaN nanotube and the single-layer GaN nanotube are semiconducting and the double-layer GaN nanotube appears nearly metallic.