IDEMPOTENCE PRESERVING MAPS ON SPACES OF TRIANGULAR MATRICES

Sheng, Yu-Qiu,Zheng, Bao-Dong,Zhang, Xian 한국전산응용수학회 2007 Journal of applied mathematics & informatics Vol.25 No.1

Suppose F is an arbitrary field. Let ${\mid}F{\mid}$ be the number of the elements of F. Let $T_{n}(F)$ be the space of all $n{\times}n$ upper-triangular matrices over F. A map ${\Psi}\;:\;T_{n}(F)\;{\rightarrow}\;T_{n}(F)$ is said to preserve idempotence if $A-{\lambda}B$ is idempotent if and only if ${\Psi}(A)-{\lambda}{\Psi}(B)$ is idempotent for any $A,\;B\;{\in}\;T_{n}(F)$ and ${\lambda}\;{\in}\;F$. It is shown that: when the characteristic of F is not 2, ${\mid}F{\mid}\;>\;3$ and $n\;{\geq}\;3,\;{\Psi}\;:\;T_{n}(F)\;{\rightarrow}\;T_{n}(F)$ is a map preserving idempotence if and only if there exists an invertible matrix $P\;{\in}\;T_{n}(F)$ such that either ${\Phi}(A)\;=\;PAP^{-1}$ for every $A\;{\in}\;T_{n}(F)\;or\;{\Psi}(A)=PJA^{t}JP^{-1}$ for every $P\;{\in}\;T_{n}(F)$, where $J\;=\;{\sum}^{n}_{i-1}\;E_{i,n+1-i}\;and\;E_{ij}$ is the matrix with 1 in the (i,j)th entry and 0 elsewhere.

Efficient Decentralized Multirobot Task Allocation for Maximizing Total Assignments

Shengli Wang,Youjiang Liu,Yongtao Qiu,Jie Zhou 제어로봇시스템학회 2022 제어로봇시스템학회 국제학술대회 논문집 Vol.2022 No.11

This paper addresses the decentralized task allocation problem of multirobot systems, in which the objective is to maximize the total task assignments, i.e., the number of tasks that can be successfully executed by all robotic vehicles under the time constraints of tasks and battery limits of vehicles. Based on the state-of-the-art performance impact (PI) algorithm, a novel extension named PI for minimizing traveling time (PI-minTravel) is proposed in this paper. With the proposed PI-minTravel, tasks that are close enough to the last task of each vehicle are assigned to the vehicle first, so that the total traveling time of all vehicles can be minimized. Due to the limited fuel of each vehicle, less traveling time will leave more time to execute tasks, then more tasks can be executed, especially when the ratio of tasks to vehicles is high. Extensive simulation results show that the proposed PI-minTravel can assign more tasks and converge within fewer iterations compared with PI algorithm, while it can assign fewer tasks but converge within much fewer iterations compared with PI for maximizing assignments (PI-maxAss) algorithm.

Scattering and Absorption Coefficients of Aerosols in a Semi-Arid Area in China: Diurnal Cycle, Seasonal Variability and Dust Events

Sheng-jie Niu,Qiu-ying Zhang 한국기상학회 2010 Asia-Pacific Journal of Atmospheric Sciences Vol.46 No.1

The authors investigated variations of aerosol scattering and absorptive properties in a semi-arid climate Observatory in the Inner Mongolia of China and factors affecting the variation. They use integrated nephelometer and aethalometer observations collected in 2005 and 2006 at the Silinhot Observatory. The results are as follows. 1) in autumn and winter, the diurnal cycle of scattering coefficient exhibited a clear bi-modal variation, and the scattering coefficient was indicative of the type of sandy weather. 2) The concentration of black carbon (BC) aerosols was much higher in winter than in the other seasons with an evident bimodal diurnal variation. 3) When the wind speed was lower than 3.5 m s-1, the dilution effect of air evidently influenced the scattering coefficient and BC mass concentration; for the wind speed above 3.5 m s-1, there appeared to be little correlation between wind speed and scattering coefficient or BC mass concentration. 4) Atmospheric visibility calculated from the aerosol scattering and absorptive coefficients was in good agreement with the direct observation of visibility. 5) Absorption by aerosols accounted for 25% of the total extinction in December.

Nonlinear dynamics analysis of multi-cutting wire electrode in WEDM-HS subjected to working fluid considering the effect of debris

Sheng-Yao Fan,Qiu-Ju Zhang,Hai-Wei Chen,Wen-xuan Zeng 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.12

A reasonable dielectric fluid velocity and better exclusion of debris are very important to obtain a stable machining performance in multi-cutting of WEDM-HS. We investigated the dynamic characteristics of multi-cutting wire electrode in WEDM-HS subjected to working fluid considering the effect of debris. First, a fluid-solid coupling nonlinear vibration model is derived by analyzing the forces acting on the multi-cutting wire which locate in the dielectric fluid. The additional axial force arising from the transverse vibration of the multi-cutting wire is considered as a nonlinear term in the model. Considering that the debris accumulation in discharge gap severely influences the stability of multi-cutting wire electrode, the relationship between the debris volume concentration and debris-working fluid two-phase flow drag coefficient is obtained using the Einstein two-phase flow viscosity theory. Finally, the influences of several parameters on the multi-cutting wire displacement are discussed in detail.

Cell type??specific channelrhodopsin-2 transgenic mice for optogenetic dissection of neural circuitry function

Zhao, Shengli,Ting, Jonathan T,Atallah, Hisham E,Qiu, Li,Tan, Jie,Gloss, Bernd,Augustine, George J,Deisseroth, Karl,Luo, Minmin,Graybiel, Ann M,Feng, Guoping Nature Publishing Group, a division of Macmillan P 2011 Nature methods Vol.8 No.9

Optogenetic methods have emerged as powerful tools for dissecting neural circuit connectivity, function and dysfunction. We used a bacterial artificial chromosome (BAC) transgenic strategy to express the H134R variant of channelrhodopsin-2, ChR2(H134R), under the control of cell type??specific promoter elements. We performed an extensive functional characterization of the newly established VGAT-ChR2(H134R)-EYFP, ChAT-ChR2(H134R)-EYFP, Tph2-ChR2(H134R)-EYFP and Pvalb(H134R)-ChR2-EYFP BAC transgenic mouse lines and demonstrate the utility of these lines for precisely controlling action-potential firing of GABAergic, cholinergic, serotonergic and parvalbumin-expressing neuron subsets using blue light. This resource of cell type??specific ChR2(H134R) mouse lines will facilitate the precise mapping of neuronal connectivity and the dissection of the neural basis of behavior.

Honokiol ameliorates endothelial dysfunction through suppression of PTX3 expression, a key mediator of IKK/IκB/NF-κB, in atherosclerotic cell model

Ling Qiu,Rong Xu,Siyang Wang,Shuijun Li,Hongguang Sheng,Jiaxi Wu,Yi Qu 생화학분자생물학회 2015 Experimental and molecular medicine Vol.47 No.-

Pentraxin 3 (PTX3) was identified as a marker of the inflammatory response and overexpressed in various tissues and cells related to cardiovascular disease. Honokiol, an active component isolated from the Chinese medicinal herb Magnolia officinalis, was shown to have a variety of pharmacological activities. In the present study, we aimed to investigate the effects of honokiol on palmitic acid (PA)-induced dysfunction of human umbilical vein endothelial cells (HUVECs) and to elucidate potential regulatory mechanisms in this atherosclerotic cell model. Our results showed that PA significantly accelerated the expression of PTX3 in HUVECs through the IκB kinase (IKK)/IκB/nuclear factor-κB (NF-κB) pathway, reduced cell viability, induced cell apoptosis and triggered the inflammatory response. Knockdown of PTX3 supported cell growth and prevented apoptosis by blocking PA-inducted nitric oxide (NO) overproduction. Honokiol significantly suppressed the overexpression of PTX3 in PA-inducted HUVECs by inhibiting IκB phosphorylation and the expression of two NF-κB subunits (p50 and p65) in the IKK/IκB/NF-κB signaling pathway. Furthermore, honokiol reduced endothelial cell injury and apoptosis by regulating the expression of inducible NO synthase and endothelial NO synthase, as well as the generation of NO. Honokiol showed an antiinflammatory effect in PA-inducted HUVECs by significantly inhibiting the generation of interleukin-6 (IL-6), IL-8 and monocyte chemoattractant protein-1. In summary, honokiol repaired endothelial dysfunction by suppressing PTX3 overexpression in an atherosclerotic cell model. PTX3 may be a potential therapeutic target for atherosclerosis.

Clinical Neuropathological Analysis of 10 Cases of Cerebral Amyloid Angiopathy-Related Cerebral Lobar Hemorrhage

Xiao-Qiu Li,Dong-Feng Su,Hui-Sheng Chen,Qu Fang 대한신경외과학회 2015 Journal of Korean neurosurgical society Vol.58 No.1

Objective : The clinical and pathological characteristics of 10 cases of cerebral amyloid angiopathy (CAA)-related cerebral lobar hemorrhage (CLH) that was diagnosed at autopsy were investigated to facilitate the diagnosis of this condition. Methods : The clinical characteristics of 10 cases of CAA-related CLH were retrospectively reviewed, and a neuropathological examination was performed on autopsy samples. Results : The 10 cases included two with a single lobar hemorrhage and eight with multifocal lobar hemorrhages. In all of the cases, the hemorrhage bled into the subarachnoid space. Pathological examinations of the 10 cases revealed microaneurysms in two, double barrel-like changes in four, multifocal arteriolar clusters in five, obliterative onion skin-like intimal changes in four, fibrinoid necrosis of the vessels in seven, neurofibrillary tangles in eight, and senile plaques in five cases. Conclusion : CAA-related CLHs were located primarily in the parietal, temporal, and occipital lobes. These hemorrhages normally consisted of multiple repeated CLHs that frequently bled into the subarachnoid space. CAA-associated microvascular lesions may be the pathological factor underlying CLH.

Path Following of Underactuated Unmanned Surface Vehicle Based on Trajectory Linearization Control with Input Saturation and External Disturbances

Bingbing Qiu,Guo-Feng Wang,Yun-Sheng Fan,Dong-Dong Mu,Xiaojie Sun 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.8

This paper investigates the path following control problem for underactuated unmanned surface vehicle(USV) in the presence of unmodeled dynamics, external disturbances and input saturation. A novel adaptive robustpath following control scheme is proposed by employing trajectory linearization control (TLC) technology andfinite-time disturbance observer, which is composed of a concise yaw rate controller and a surge speed controller. The salient features of the proposed scheme include: a path following guidance law is designed to ensure USVeffectively converging to and following the desired path; TLC is introduced into the field of USV motion controlas new effective technique, and it is the first time used to design path following controller for underactuated USV;a finite-time nonlinear tracking differentiator is constructed not only to avoid the signal jump caused by derivation,but also to filter noise and high frequency interference. A finite-time disturbance observer (FDO) is devised toexactly observe the uncertain dynamics and unknown external disturbances, which improves the tracking accuracyand precise disturbance rejection of the proposed controller; then, an auxiliary dynamic system that is governed bysmooth switching function is developed to compensate for the saturation constraint on actuator. Stability analysisverifies that all signals in the closed-loop system are uniformly ultimately bounded. Finally, simulation results andcomparisons illustrate the superiority of the proposed control scheme.

Lobaplatin-TACE Combined with Radioactive ¹²⁵I Seed Implantation for Treatment of Primary Hepatocellular Carcinoma

Peng, Sheng,Yang, Qiu-Xia,Zhang, Tao,Lu, Ming-Jian,Yang, Guang,Liu, Zhen-Yin,Zhang, Rong,Zhang, Fu-Jun Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.13

Aim: To investigate the efficacy and safety of lobaplatin-transcatheter arterial chemoembolization (TACE) combined with radioactive $^{125}I$ seed implantation in treatment of primary hepatocellular carcinoma (HCC). Methods: 75 patients with primary HCC were enrolled in the study, among them 43 receiving lobaplatin-TACE (TACE group) and 32 lobaplatin-TACE combined with $^{125}I$ seed implantation (TACE+$^{125}I$ group). After treatment, the local remission rates and postoperative complications of two groups were compared using the Pearson Chi-square test. Overall survival in the two groups was calculated using Kaplan-Meier survival curves and the differences were tested using Log-rank test. Results: There were 7 cases of complete response (CR), 13 of partial response (PR), 6 of stable disease (SD) and 17 of progressive disease (PD) in the TACE group, with 13 cases of CR, 9 of PR, 5 of SD and 5 of PD in the TACE+$^{125}I$ group. The disease control rates of TACE and TACE+$^{125}I$ group were 60.5% (26/43) and 84.4% (27/32), respectively, with a significant difference between them (P < 0.05). The survival rates at 6, 12 and 18 months in the TACE group were 100.0%, 81.8% and 50.0%, respectively, and those in TACE+$^{125}I$ group were 100.0%, 93.8% and 65.6%. The mean survival times in the TACE and TACE+$^{125}I$ groups were 19.5 and 22.9 months, respectively. There was a significant difference in the overall survival rate between two groups (P < 0.05). No serious complications were encountered in either group. Conclusion: Lobaplatin-TACE combined with $^{125}I$ seed implantation is favorable and safe for treatment of primary HCC.

Transformer Fault diagnosing method based on Extenics and Rough Set theory

Gefei Qiu,Zhaoxiang Xie,Sheng Huang,Yunjie Zuo,Zejiang Hu 보안공학연구지원센터 2014 International Journal of Security and Its Applicat Vol.8 No.5