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LMI Stability Criterion with Less Variables for Time-delay Systems
Xun-Lin Zhu,Tao Li,Chong Lin,Lei Guo,Guang-Hong Yang 제어·로봇·시스템학회 2009 International Journal of Control, Automation, and Vol.7 No.4
Slack variables approach is an important technique for tackling the delay-dependent stability problem for systems with time-varying delay. In this paper, a new delay-dependent stability criterion is presented without introducing any slack variable. The technique is based on a simply integral inequal-ity. The result is shown to be equivalent to some existing ones but includes the least number of vari-ables. Thus, redundant selection and computation can be avoided so that the computational burden can be largely reduced. Numerical examples are given to illustrate the effectiveness of the proposed stabil-ity conditions.
Peniciside, a New Triterpenoid Glycoside, from the Fungus Penicillium sp. 169
Xiao-Hong Yuan,Guo-You Li,Guo-Bo Xu,Wei-Lin Wu,Tao Yang 대한약학회 2012 Archives of Pharmacal Research Vol.35 No.2
Peniciside, a new fernene triterpenoid glycoside, was isolated from the EtOAc extract of the solid-state fermented rice culture of the fungus Penicillium sp. 169. Its structure was elucidated on the basis of spectroscopic analysis, and the absolute configuration was determined by X-ray crystallographic analysis and chemical methods. Peniciside is the first example of a fernene triterpenoid glycoside with two hydroxyls at C-19 and C-20.
The Gender-Sensitive Social Risk Factors for Internet Addiction in College Undergraduate Students
Xia Lin,Jing-yan Gu,Wan-jun Guo,Ya-jing Meng,Hui-yao Wang,Xiao-jing Li,Wei Deng,Lian-sheng Zhao,Xiao-hong Ma,Ming-li Li,Ting Chen,S,K,Cheng,Tao Li 대한신경정신의학회 2021 PSYCHIATRY INVESTIGATION Vol.18 No.7
Objective The current study aims to explore precipitating and social risk factors for internet addiction (IA) in university undergraduate students, and to provide evidence for interventions and the early prevention of IA in different genders. Methods Four thousand eight hundred and fifty-eight college sophomores completed an online survey on their internet use-related behaviours and social risk factors. Results We found that more male (8.3%) than female students (5.4%) had moderate and severe IA. The main online activity in the moderate and severe IA groups was online gaming in males and online streaming in females. Roommates engaging in similar internetbased entertainment was a risk factor of IA only for males, while not being in a romantic relationship was a risk factor of IA for females only. Infatuation with the internet before college and adjustment problems for college life were shared risk factors for both genders in the mild and moderate IA groups. Conclusion IA was a common phenomenon in college students with shared and unique precipitating and social risk factors in males and females. The gender-sensitive risk factors for IA warranted earlier and individualized intervention and prevention strategies for IA in this population.
Li, Hong-Sheng,Chen, Jin-Hu,Zhang, Wei,Shang, Dong-Ping,Li, Bao-Sheng,Sun, Tao,Lin, Xiu-Tong,Yin, Yong Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.3
Objective: To evaluate the effect of intravenous contrast on dose calculation in radiation treatment planning for oesophageal cancer. Methods: A total of 22 intravein-contrasted patients with oesophageal cancer were included. The Hounsfield unit (HU) value of the enhanced blood stream in thoracic great vessels and heart was overridden with 45 HU to simulate the non-contrast CT image, and 145 HU, 245 HU, 345 HU, and 445 HU to model the different contrast-enhanced scenarios. 1000 HU and -1000 HU were used to evaluate two non-physiologic extreme scenarios. Variation in dose distribution of the different scenarios was calculated to quantify the effect of contrast enhancement. Results: In the contrast-enhanced scenarios, the mean variation in dose for planning target volume (PTV) was less than 1.0%, and those for the total lung and spinal cord were less than 0.5%. When the HU value of the blood stream exceeded 245 the average variation exceeded 1.0% for the heart V40. In the non-physiologic extreme scenarios, the dose variation of PTV was less than 1.0%, while the dose calculations of the organs at risk were greater than 2.0%. Conclusions: The use of contrast agent does not significantly influence dose calculation of PTV, lung and spinal cord. However, it does have influence on dose accuracy for heart.
Bolin Dai,Hong Tao,Yu-Jung Lin,Chang-Tang Chang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.9
Different kinds of graphene (GN)/titania nanocomposites using graphene and P25 or Titanium (IV) n-butoxide (TBOT) as precursors were prepared with hydrothermal method. To investigate the differences of the photocatalytic properties of composites with various shapes of titanium dioxide (TiO2), three types of TiO2, including titanium nanotubes (TNT), titanium nanosheets (TNS) and titanium nanoparticles (TNP) were successfully prepared and combined with GN to form the composites. The prepared composites were confirmed by Ultraviolet-visible spectroscopy (UV-Vis), X-ray diffraction (XRD), Fourier transform infrared (FTIR), X-ray Photoelectron Spectroscopy (XPS), and transmission electron microscopy (TEM), etc. Photocatalytic activities of composites were carried out by the degradation of Reactive Black 5 (RBk5) and Norfloxacin (NFXC) under the radiation of UV lamp. Results indicate that the differences in the TiO2 morphology of the composites greatly influence the catalytic properties. In addition, the heterojunction between graphene and TiO2 also play an important role in the photocatalytic abilities of composites. In this study, it can be seen that the prepared composites exhibit higher photocatalytic activity including excellent adsorption capacity and photo-degradation ability than P25. The photocatalytic activity of GN–TNS is higher than that of GN–TiO2 and GN–TNT.
Wei, Wei-Hong,Cai, Xiu-Yu,Xu, Tao,Zhang, Guo-Yi,Wu, Yong-Feng,Feng, Wei-Neng,Lin, Li,Deng, Yan-Ming,Lu, Qiu-Xia,Huang, Zhe-Li Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.3
Background and Purpose: Cisplatin is the most common chemotherapeutic agent for loco-regionally advanced nasopharyngeal carcinoma (NPC); however, toxicity is a limiting factor for some patients. We retrospectively compared the efficacy and toxicity of weekly docetaxel-based and cisplatin-based concurrent chemoradiotherapy in loco-regionally advanced NPC. Methods and Materials: Eighty-four patients with Stage III and IVA-B NPCs, treated between 2007 and 2008, were retrospectively analyzed. Thirty received weekly docetaxel-based concurrent chemotherapy, and 43 were given weekly cisplatin-based concurrent chemotherapy. Radiotherapy was administered using a conventional technique (seven weeks, 2.0 Gy per fraction, total dose 70-74 Gy) with 6-8 Gy boosts for some patients with locally advanced disease. Results: Median follow-up time was 42.3 months (range, 8.6-50.8 months). There were no significant differences in the 3-year loco-regional failure-free survival (85.6% vs. 92.3%; p=0.264), distant failure-free survival (87.0% vs. 92.5%; p=0.171), progression-free survival (85.7% vs. 88.4%; p=0.411) or overall survival (86.5% vs. 92.5%, p=0.298) of patients treated concurrently with docetaxel or cisplatin. Severe toxicity was not common in either group. Conclusions: Weekly docetaxel-based concurrent chemoradiotherapy is potentially effective and has a tolerable toxicity; however, further investigations are required to determine if docetaxel is superior to cisplatin for advanced stage NPC.
Zhang Zi-Lin,Yuan Hong-Tao,Sun Shi-Li,Ren Hui-Long 대한조선학회 2021 International Journal of Naval Architecture and Oc Vol.13 No.1
Based on the potential flow theory, a fully nonlinear numerical procedure is developed with boundary element method to analyze the interaction between a fixed semi-submersible platform and incident waves in open water. The incident wave is separated from the scattered wave under fully nonlinear boundary conditions. The mixed Euler-Lagrangian method is used to capture the position of the disturbed wave surface in local coordinate systems. The wave forces exerted on an inverted conical frustum are used to ensure the accuracy of the present method and good agreements with published results are obtained. The hydrodynamic characteristics of the semi-submersible platform interacting with regular waves are analyzed. Pressure distribution with time and space, tension and compression of the platform under wave action are investigated. 3D behaviors of wave run-ups are predicted. Strong nonlinear phenomena such as wave upwelling and wave interference are observed and analyzed.
Liang Wang,Tao Chen,Xin-yue Liu,Xu-dong Lin,Xiao-xia Yang,Hong-zhuang Li 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.68 No.3
In this research, investigations on the closed-loop control stability of adaptive optics systems are conducted by using the Lyapunov approach. As an direct metric of the control stability, the error propagator includes the effects of both the integral gain and the influence matrix and is effective for control-stability evaluation. An experimental 97-element AO system is developed for the control-stability investigation, and the Southwell sensor-actuator configuration rather than the Fried geometry is adopted so as to suppress the potential waffle mode. Because filtering out small singular values of the influence matrix can be used to improve the control stability, the effect of the influence matrix and the effect of the integral gain are considered as a whole by using the error propagator. Then, the control stability of the AO system is evaluated for varying the integral gains and the number of filtered-out singular values. Afterwards, an analysis of the evaluations of the error propagator is made, and a conclusion can be drawn that the control stability can be improved by filtering out more singular values of the influence matrix when the integral gain is high. In other words, the error propagator is useful for trading off the bandwidth error and the fitting error of AO systems in a control-stability approach. Finally, a performance measurement of the experimental AO system is conducted when 13 smaller singular values of the influence matrix are filtered out, and the results show that filtering out a small fraction of the singular values has a minor influence on the performance of this AO system.