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Search Results: 1 - 10 of 25750 matches for " Ping Hwang "
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Methods of exploring energy diffusion in lattices with finite temperature
Ping Hwang,Hong Zhao
Physics , 2011,
Abstract: We discuss two methods for exploring energy diffusion in lattices with finite temperature in this paper. The first one is the energy-kick (EK) method. To apply this method, one adds an external energy kick to a particle in the lattice, and tracks its evolution by evolving the kicked system. The second one is the fluctuation-correlation (FC) method. The formula for calculating the probability density function (PDF) using the canonical ensemble is slightly revised and extended to the microcanonical ensemble. We show that the FC method has advantages over the EK method theoretically and technically. Theoretically, the PDF obtained by the FC method reveals the diffusion processes of the inner energy while the PDF obtained by the EK method represents that of the kick energy. The diffusion processes of the inner energy and the external energy added to the system, i.e., the kick energy, may be different quantitatively and even qualitatively depending on models. To show these facts, we study not only the equilibrium systems but also the stationary nonequilibrium systems. Examples showing that the inner energy and the kick energy may have different diffusion behavior are reported in both cases. The technical advantage enables us to study the long-time diffusion processes and thus avoids the finite-time effect.
Complete residue systems in the ring of matrices of rational integers
Jau-Shyong Shiue,Chie-Ping Hwang
International Journal of Mathematics and Mathematical Sciences , 1978, DOI: 10.1155/s0161171278000253
Abstract: This paper deals with the characterizations of the complete residue system mod. ¢ € ‰ ¢ € ‰ ¢ € ‰G, where G is any n —n matrix, in the ring of n —n matrices.
Quasi-Static and Dynanmic Deformation Behaviors of Medium-Carbon Steels in a Wide Temperature Range  [PDF]
Byoungchul Hwang
Materials Sciences and Applications (MSA) , 2011, DOI: 10.4236/msa.2011.26076
Abstract: This paper presents a study of the quasistatic and dynamic deformation behaviors of conventional and microalloyed medium-carbon steels in a wide temperature range. As strain rate increased, the flow stress increased at room temperature, but occasionally did not at elevated temperatures. The flow stress of the microalloyed steel containing precipitates was less sensitive to strain rate at room temperature than that of the conventional steel due to a relatively larger activation length. Microstructural observation of the steels deformed after compression test indicated that inhomogeneous deformation became more serious with increasing strain rate and temperature without fracturing in the highly localized region.
Mechanism of Salutary Effects of Astringinin on Rodent Hepatic Injury following Trauma-Hemorrhage: Akt-Dependent Hemeoxygenase-1 Signaling Pathways
Fu-Chao Liu, Tsong-Long Hwang, Ying-Tung Lau, Huang-Ping Yu
PLOS ONE , 2011, DOI: 10.1371/journal.pone.0025907
Abstract: Astringinin can attenuate organ injury following trauma-hemorrhage, the mechanism remains unknown. Protein kinase B/hemeoxygenase-1 (Akt/HO-1) pathway exerts potent anti-inflammatory effects in various tissues. The aim of this study is to elucidate whether Akt/HO-1 plays any role in astringinin-mediated attenuation of hepatic injury following trauma-hemorrhage. For study this, male Sprague-Dawley rats underwent trauma-hemorrhage (mean blood pressure 35–40 mmHg for 90 min) followed by fluid resuscitation. A single dose of astringinin (0.3 mg/kg body weight) with or without a PI3K inhibitor (wortmannin) or a HO antagonist (chromium-mesoporphyrin) was administered during resuscitation. Various parameters were measured at 24 h post-resuscitation. Results showed that trauma-hemorrhage increased plasma aspartate and alanine aminotransferases (AST and ALT) concentrations and hepatic myeloperoxidase activity, cytokine induced neutrophil chemoattractant (CINC)-1, CINC-3, intercellular adhesion molecule-1, and interleukin-6 levels. These parameters were significantly improved in the astringinin-treated rats subjected to trauma-hemorrhage. Astringinin treatment also increased hepatic Akt activation and HO-1 expression as compared with vehicle-treated trauma-hemorrhaged rats. Co-administration of wortmannin or chromium-mesoporphyrin abolished the astringinin-induced beneficial effects on post-resuscitation pro-inflammatory responses and hepatic injury. These findings collectively suggest that the salutary effects of astringinin administration on attenuation of hepatic injury after trauma-hemorrhage are likely mediated via Akt dependent HO-1 up-regulation.
THE "SECOND METHOD" OF LIAPUNOV AND THE ANALYTICAL DESIGN OF THE OPTIMUM CONTROLLER
李雅普諾夫第二方法与最优控制器分析設計计问題

HWANG LING,ZHENG YIN-PING,CHANG DI,
黄琳
,鄭应平,張迪

自动化学报 , 1964,
Abstract: 本文应用李雅普诺夫第二方法与贝尔曼的动态规则法,讨论了最优控制器的分析设计问题,并提出了一种对理论分析与实际计算都比较方便的序列逼近法.在第一节中,给出了最优控制器分析设计问题的一般提法与作为必要条件的贝尔曼方程.在第二节中,给出了对进一步研究所需的有关李雅普诺夫第二方法的基本结果,以便使以后的论证更为简捷.在第三节中,给出了在一般提法下分析设计问题的一般性结果,其中包括唯一性定理、贝尔曼方程的充分性、序列逼近法及其基本性质.在第四节中,研究了常系数线性系统,解决了最优控制的存在唯一性问题,文中列举了数例,以说明序列逼近法具有较快的收斂速度,并论证了这种方法的收斂速度系按指数进行的.在第五节中,研究了拟常系数线性系统,并分别对缓变系数线性系统与定常拟线性系统进行了讨论,给出了例题以说明理论结果.最后在第六节中,讨论了某些进一步推广的问题.本文所引入的方法,均直接针对综合问题而给出,因而在理论研究与实际运用上,是方便可行的.
Twin-VCM Controller Design for the Nutator System with Evolutionary Algorithms
Hsieh Sheng-Ping,Hwang Thong-Shing,Ni Chih-Wen
IETE Technical Review , 2009,
Abstract: We present an evolutionary algorithm to optimize controller parameters for a nonlinear nutator system which is implemented in twin voice coil motors (VCMs). In this paper, genetics-based algorithm is applied to tune the proportional-integral-derivative (PID) controller for the multi-input multi-output (MIMO) coupling system. The result has been validated that this algorithm can find out all six PID control parameters in optimal and robust senses. The controller architecture of the nutator system is constructed to meet the specifications of the coupled mirror and rocker parallel loops, both adopting PID control. Two main linear VCMs operating in a push-pull organization drive the nutator subreflector. The mandatory operation mode for the nutator system is two-position switching. The required technical specifications for the nutator control system are extremely precise requirements, system tracking control with a disturbance force more challenging than that in ordinary systems. Simulation results have demonstrated the superiority of the evolutionary algorithm, satisfying the Atacama large -millimeter/submillimeter array (ALMA) severe conditions and requirements.
Osthole Attenuates Hepatic Injury in a Rodent Model of Trauma-Hemorrhage
Huang-Ping Yu, Fu-Chao Liu, Yung-Fong Tsai, Tsong-Long Hwang
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0065916
Abstract: Recent evidences show that osthole possesses anti-inflammatory properties and protective effects following shock-like states, but the mechanism of these effects remains unknown. The p38 mitogen-activated protein kinase (p38 MAPK) pathway exerts anti-inflammatory effects in injury. The aim of this study was to investigate whether p38 MAPK plays any role in the osthole-mediated attenuation of hepatic injury after trauma-hemorrhage. Male Sprague-Dawley rats underwent trauma-hemorrhage (mean blood pressure maintained at approximately 35–40 mmHg for 90 minutes), followed by fluid resuscitation. During resuscitation, a single dose of osthole (3 mg/kg, intravenously) with and without a p38 MAPK inhibitor SB-203580 (2 mg/kg, intravenously), SB-203580 or vehicle was administered. Plasma alanine aminotransferase (ALT) with aspartate aminotransferase (AST) concentrations and various hepatic parameters were measured (n = 8 rats/group) at 24 hours after resuscitation. The results showed that trauma-hemorrhage increased hepatic myeloperoxidase activity, intercellular adhesion molecule-1 and interleukin-6 levels, and plasma ALT and AST concentrations. These parameters were significantly improved in the osthole-treated rats subjected to trauma-hemorrhage. Osthole treatment also increased hepatic phospho-p38 MAPK expression compared with vehicle-treated trauma-hemorrhaged rats. Co-administration of SB-203580 with osthole abolished the osthole-induced beneficial effects on the above parameters and hepatic injury. These results suggest that the protective effect of osthole administration on alleviation of hepatic injury after trauma-hemorrhage, which is, at least in part, through p38 MAPK-dependent pathway.
Protective Effect of Tropisetron on Rodent Hepatic Injury after Trauma-Hemorrhagic Shock through P38 MAPK-Dependent Hemeoxygenase-1 Expression
Fu-Chao Liu, Huang-Ping Yu, Tsong-Long Hwang, Yung-Fong Tsai
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0053203
Abstract: Tropisetron can decrease inflammatory cell responses and alleviate organ damage caused by trauma-hemorrhage, but the mechanism of these effects remains unknown. The p38 mitogen-activated protein kinase/hemeoxygenase-1 (p38 MAPK/HO-1) pathway exerts anti-inflammatory effects on different tissues. The aim of this study was to investigate whether p38 MAPK/HO-1 plays any role in the tropisetron-mediated attenuation of hepatic injury after trauma-hemorrhage. Male Sprague-Dawley rats underwent trauma-hemorrhage (mean blood pressure maintained at approximately 35–40 mmHg for 90 min), followed by fluid resuscitation. During resuscitation, several treatment regimens were administered: four doses of tropisetron alone (0.1, 0.3, 1, 3 mg/kg body weight), or a single dose of tropisetron (1 mg/kg body weight) with and without a p38 MAPK inhibitor (SB-203580, 2 mg/kg body weight) or HO antagonist (chromium-mesoporphyrin, 2.5 mg/kg body weight). Various parameters were measured, and the animals were sacrificed at 24 h post-resuscitation. The results showed that trauma-hemorrhage increased the following parameters: plasma concentrations of aspartate (AST) and alanine aminotransferases (ALT), hepatic myeloperoxidase (MPO) activity, and levels of cytokine-induced neutrophil chemoattractant-1 and -3 (CINC-1 and CINC-3), intercellular adhesion molecule-1 (ICAM-1), interleukin-6 (IL-6), tumor necrosis factor-α (TNF-α), and macrophage inflammatory protein-1α (MIP-1α). These parameters were significantly improved in the tropisetron-treated rats subjected to trauma-hemorrhage. Tropisetron treatment also increased hepatic p38 MAPK and HO-1 expression compared with vehicle-treated trauma-hemorrhaged rats. Co-administration of SB-203580 or chromium-mesoporphyrin with tropisetron abolished the tropisetron-induced beneficial effects on the above parameters and hepatic injury. These results suggest that the protective effect of tropisetron administration on alleviation of hepatic injury after trauma-hemorrhage is likely mediated through p38 MAPK-dependent HO-1 expression.
Thermal Comfort for Urban Parks in Subtropics: Understanding Visitor’s Perceptions, Behavior and Attendance
Chuang-Hung Lin,Tzu-Ping Lin,Ruey-Lung Hwang
Advances in Meteorology , 2013, DOI: 10.1155/2013/640473
Abstract: The paper is an effort toward thermal comfort assessment for urban parks under the climatic conditions of Taiwan to help architects achieve better climatic design. Field interviews, observations, and micrometeorological measurements were conducted in this study. The WBGT was used as the thermophysiological index to investigate the effects of thermal conditions on visitor’s thermal perception and adaptive behavior in outdoor urban spaces. In this study, behavioral adaptations used by visitors as a means of achieving comfort were evaluated. Observational results showed that the overall attendance was influenced by sun and thermal conditions. There was a robust relationship between thermal sensation votes, as well as thermal acceptability, and thermal environment, in terms of WBGT. The upper and lower limits of 80% acceptability are 26°C WBGT and 20°C WBGT, respectively. 1. Introduction Ensuring acceptable thermal comfort conditions in outdoor spaces is always one of the considerations of landscape design, since thermal environmental conditions greatly affect individual moods and activities in the outdoors as well as the usage of the outdoor spaces. In densely populated cities, with the continuously growing emphasis on the importance of quality of life, the public attaches greater value to the quality of thermal comfort in outdoor urban spaces. At the same time, with the expansion of cities, the urban heat island effect is increasingly significant, and the trend of urban microclimate change is not optimistic. Hence, the architects or landscape designers must seriously consider the actions required for outdoor space design to support comfortable conditions. In recent years, the thermal comfort of outdoor spaces has become an important issue, attracting a considerable number of articles to analyze and discuss outdoor thermal comfort through field surveys, for example, Spagnolo and de Dear in Australia [1], Ahmed in Bangladesh [2], Nakano and Tanabe in Japan [3], Nikolopoulou and Lykoudis in European countries [4], Oliveira and Andrade [5] and Andrade et al. [6] in Portugal, Cheng et al. in Hong Kong [7], Kariminia et al. in Iran [8], and Lin [9], Hwang et al. [10], and Lin et al. [11] in Taiwan. Many of the research studies have generally used a thermophysiological index in outdoor thermal condition analysis. Some of the indices, for example, physiological equivalent temperature (PET), standard new effective temperature (SET*), universal thermal climate index (UTCI), and so forth, are based on comprehensive energy-balance models for the human body to
Diagnostic Signatures of Radio and HXR Emission on Particle Acceleration Processes in the Coma Cluster
Ping-Hung Kuo,Chorng-Yuan Hwang,Wing-Huen Ip
Physics , 2003, DOI: 10.1086/376966
Abstract: We investigate theoretical models for the radio halo and hard X-ray (HXR) excess in the Coma galaxy cluster. Time-independent and time-dependent re-acceleration models for relativistic electrons have been carried out to study the formation of the radio halo and HXR excess. In these models, the relativistic electrons are injected by merger shocks and re-accelerated by ensuing violent turbulence. The effects of different Mach numbers of the merger shocks on the radio and HXR excess emission are also investigated. We adopt 6 $\mu$G as the central magnetic field and reproduce the observed radio spectra via the synchrotron emission. We also obtain a central "plateau" in the radio spectral-index distribution, which have been observed in radio emission distribution. Our models can also produce the observed HXR excess emission via the inverse Compton scattering of the cosmic microwave background photons. We find that only the merger shocks with the Mach numbers around 1.6--2 can produce results in agreement with both the radio and HXR emission in the Coma cluster.
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