Optimal Timing Control of Discrete-Time Linear Switched Stochastic Systems

Xiaomei Liu,Kanjian Zhang,Shumin Fei,Haikun Wei,Shengtao Li 제어·로봇·시스템학회 2014 International Journal of Control, Automation, and Vol.12 No.4

Optimal switch-time control is the study that investigates how best to switch between different modes. In this paper, we investigate the optimal switch-time control problem for discrete-time linear switched stochastic systems. In particular, under the assumption that the sequence of active subsystems is pre-specified, we focus on the problem where the objective is to minimize a cost functional defined on the states and the switching times are the only control variables. For systems with one switching time, using calculus of variations, we firstly derive the difference formulae of the cost functional with respect to the switching time, which can be directly used to find the optimal switching instant. Then, a method is presented to deal with the problem with multiple switching times case. Finally, the viability of the proposed method is illustrated through two numerical examples.

Overexpression of A RING finger ubiquitin ligase gene AtATRF1 enhances aluminium tolerance in Arabidopsis thaliana

Xiaomei Qin,Sheng Huang,Yanqing Liu,Mingdi Bian,Wuliang Shi,Zecheng Zuo,Zhenming Yang 한국식물학회 2017 Journal of Plant Biology Vol.60 No.1

Aluminium (Al) toxicity is a primary limitation of crop production in acid soils, which take over 40% of arable soil worldwide. In previous studies, a series of genes have been identified to regulate the plant Al resistance or tolerance. However, none of E3 ubiquitin ligase, the key factor of ubiquitination that plays an important role in plant growth and development, has been characterized for Al response in Arabidopsis. In this study, an E3 ubiquition ligase gene AtATRF1 (Al Tolerance RING Finger 1), a homolog of RAD18 interacting RAD6 to repair the damaged DNA in human and yeast, is isolated from Arabidopsis. It encodes a predicted protein of 296 amino acids with a C3HC4 type RING finger domain. The expression of AtATRF1 is induced by Al, and the transgenic plant overexpressing AtATRF1 enhances the Al tolerance. Similar as RAD18, the AtATRF1 locates in nucleus and regulates the expression of AtATR, which involves in DNA repair and Al response in Arabidopsis. Our results indicate that nuclearlocated AtATRF1 may interact and ubiquitinate the transcriptional regulator of AtATR to mediate the Al tolerance of Arabidopsis.

Research on Stability of Strategic Alliance in Heilongjiang Soybean Processing Industry : an Empirical Study based on AHP and FCE Method

Xiaomei Zhang,Na Liu,Yang Wang 보안공학연구지원센터 2016 International Journal of Security and Its Applicat Vol.10 No.3

In recent years, as the economic continuous development, market competition has been dramatically increasing. In order to maintain competition advantage, enterprises have to seek for more cooperation. As a new model of cooperation, industry strategic alliance is a significant method for cooperation to get competitive advantage, also increasing the rate of innovation. However, due to a variety of factors, part of the alliance is not stable, failure rate is very high. Heilongjiang province soybean processing industry strategic alliance as one of the best agricultural strategic alliance in China, it is also disturbed by it. In order to ensure the healthy and stable development of the alliance, in this paper, we will draw on relevant literature and expert advice, also field visits to the alliance, finding out the factors affecting the stability of the alliance. Then, AHP and fuzzy comprehensive evaluation method are combined to identify high impact factors, and puts forward specific comments based on the factors identified, thereby enhancing the long-term stable development of the alliance. At the same time, it also laid the foundation for the healthy development of other alliances.

A Novel Perceptual Hashing for Color Images Using a Full Quaternion Representation

( Xiaomei Xing ),( Yuesheng Zhu ),( Zhiwei Mo ),( Ziqiang Sun ),( Zhen Liu ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.12

Quaternions have been commonly employed in color image processing, but when the existing pure quaternion representation for color images is used in perceptual hashing, it would degrade the robustness performance since it is sensitive to image manipulations. To improve the robustness in color image perceptual hashing, in this paper a full quaternion representation for color images is proposed by introducing the local image luminance variances. Based on this new representation, a novel Full Quaternion Discrete Cosine Transform (FQDCT)-based hashing is proposed, in which the Quaternion Discrete Cosine Transform (QDCT) is applied to the pseudo-randomly selected regions of the novel full quaternion image to construct two feature matrices. A new hash value in binary is generated from these two matrices. Our experimental results have validated the robustness improvement brought by the proposed full quaternion representation and demonstrated that better performance can be achieved in the proposed FQDCT-based hashing than that in other notable quaternion-based hashing schemes in terms of robustness and discriminability.

Quad-Band Bandpass Filter Using Quad-Mode Stub-loaded Resonators

Haiwen Liu,Xiaomei Wang,YAN WANG,Shen Li,Yulong Zhao,Xuehui Guan 한국전자통신연구원 2014 ETRI Journal Vol.36 No.4

Compact multi-band bandpass filters using quad-mode stubloadedresonators are proposed in this letter. Firstly, a novelapproach about the mode-splitting characteristics of thequadruple-mode resonator is investigated, which can providedual-band behavior. Secondly, a quad-band filter is proposedand designed by cascading two quadruple-mode resonators;the upper one operates at 1.8/2.4 GHz (GSM- and WiMaxband)and the lower one at 1.57/2.1 GHz (GPS- and WCDMAband). Finally, the proposed filters have been fabricated. Respectable agreement between simulation and measurementverifies the validity of this design methodology.

Promoter effects of adeno-associated viral vector for transgeneexpression in the cochlea in vivo

Yuhe Liu,Takashi Okada,Tatsuya Nomoto,Xiaomei Ke,Akihiro Kume,Keiya Ozawa,Shuifang Xiao 생화학분자생물학회 2007 Experimental and molecular medicine Vol.39 No.2

The aims of this study were to evaluate the expression of enhanced green fluor escent protein (EGFP) driven by 6 different promoters, including cytomegalovirus IE enhancer and chicken βactin promoter (CAG), cytomegalovirus promoter (CMV), neuron-specific enolase promoter (NSE), myosin 7A promoter (Myo), elongation factor 1α promoter (EF-1α), and Rous sarcoma virus promoter (RSV), and assess the dose in the cochlea. Serotype 1 adeno-associated virus (AAV1) vectors with various constructs were transduced into the cochl eae, and the level of EGFP expression was examined. We found the highest EGFP expression in the inner hair cells and other cochlear cells when CAG promoter was used. The CMV and NSE promoter drove the higher EGFP expression, but only a marginal activity was ob-served in EF-1α promoter driven constructs. RSV promoter failed to drive the EGFP expression. Myo promoter driven EGFP was exclusively expressed in the inner hair cells of the cochlea. When driven by CAG promoter, reporter gene expression was detected in inner hair cells at a dose as low as 3 107 genome copies, and continued to increase in a dose- dependent manner. Our data showed that individual expression in the cochlear cells. Our results might provide important information with regard to the role of promoters in regulating transgene expression and for the proper design of vectors for gene expression and gene therapy.

Mining Implicit Correlations between Users with the Same Role for Trust-Aware Recommendation

( Haifeng Liu ),( Zhuo Yang ),( Jun Zhang ),( Xiaomei Bai ),( Wei Wang ),( Feng Xia ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.12

Trust as one of important social relations has attracted much attention from researchers in the field of social network-based recommender systems. In trust network-based recommender systems, there exist normally two roles for users, truster and trustee. Most of trust-based methods generally utilize explicit links between truster and trustee to find similar neighbors for recommendation. However, there possibly exist implicit correlations between users, especially for users with the same role (truster or trustee). In this paper, we propose a novel Collaborative Filtering method called CF-TC, which exploits Trust Context to discover implicit correlation between users with the same role for recommendation. In this method, each user is first represented by the same-role users who are co-occurring with the user. Then, similarities between users with the same role are measured based on obtained user representation. Finally, two variants of our method are proposed to fuse these computed similarities into traditional collaborative filtering for rating prediction. Using two publicly available real-world Epinions and Ciao datasets, we conduct comprehensive experiments to compare the performance of our proposed method with some existing benchmark methods. The results show that CF-TC outperforms other baseline methods in terms of RMSE, MAE, and recall.

NGO and Precise Poverty Alleviation in China

Wenli Han,Xiaomei Liu 연세대학교 빈곤문제국제개발연구원 2013 Journal of Poverty Alleviation and International D Vol.4 No.1

This paper analyzes the market logic and operating model of precise poverty alleviation programs carried out by a native Chinese NGO in China’s rural areas based on the case study of the BADICAO activity. Research shows, compared to the government, the NGO demonstrates special advantages at the micro operating level in poverty alleviation programs because of its advanced concepts in sustainable development and its precise targeting to assist poverty-stricken people, as well as its mobilization ability of resources in many ways. While for the special national conditions and the administrative management system of China, the development of NGO is still at an immature stage; independence, legality and the acceptance of citizens are the main factors to restrict the further development of the NGO in acting as the main body in poverty alleviation. Policy support and promotion from the government from a macroscopic aspect are very necessary.

Research on Strategies Thoughts and Paths of New Urbanization in CHINA

Jl Xiaolan,LIU Xiaomei 한국도시행정학회 2013 한국도시행정학회 학술발표대회 논문집 Vol.2013 No.9

This Paper, based on the general understanding of the urbanization from the perspective of Chinese domestic situation, presents reflections in regard to the theory and method of China"s urbanization from four aspects, including reflections on principles of the urbanization, law of the urbanization, theory of the urbanization, and research methods of the urbanization. The strategic thoughts and path of urbanization in China are discussed. The new urbanization in China needs to be propelled from two levels, including the metropolitan urbanization oriented by the city belts in advanced areas, and the rural urbanization oriented by the counties and towns. The principles of urbanization are practical measures in the light of local conditions, independent choosing, getting rich on long-term basis, and people oriented. Government, enterprise, social organization and citizens are suggested to share the obligations and duties to promote the new urbanization.

The preparation of alginate–AgNPs composite fiber with green approach and its antibacterial activity

Xihui Zhao,Qun Li,Xiaomei Ma,Wanying Liu,Jianping Wang,Yanzhi Xia 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.24 No.-

Antibacterial alginate fibers containing silver nanoparticles (AgNPs) have been prepared in this work. Firstly, AgNPs colloid solution was obtained employing alginate as stabilizing agent and glucose as reducing agent. Then, sodium alginate powder was directly added to the above solution and the resultant sodium alginate–AgNPs spinning dope was spun to prepare alginate–AgNPs composite fibers. The fibers were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction and thermal gravimetric analysis (TG). Mechanical properties of the fibers were also measured. The antimicrobial properties were investigated by Staphylococcus aureus and Escherichia coli, and the results indicated that the composite fibers showed strong antibacterial activity.