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Survive the climate variability?
I-Ching Chen,Sheng-Feng Shen,Shih-Fan Chan 한국응용곤충학회 2013 한국응용곤충학회 학술대회논문집 Vol.2013 No.10
Climate and its variability characterize abiotic environment for species on the earth. Increased seasonality in higher latitude and/or pronounced diurnal temperate range in higher ground as well as decreasing mean temperature are major climate gradients to which organisms must adapt through physiological and behavioral plasticity. IPCC AR5 pointed out that climate variability and its regional behavior remain top concerns, which may well pose great challenges to climate change biology. We use Nicrophorus nepalensis (Coleoptera: Silphidae) a wide-distributed burying beetle in low latitude Asia as model species to investigate possible impacts of climate variability on species performance. N. nepalensis is a scavenging species exploring carcasses for feeding and reproduction. To consider their breeding performance, we baited N. nepalensis by small mouse carcasses and measured the rate at which they successfully buried the carcasses into soil. We look at climate variability along elevational gradients of intact forest and open habitats exposure to agricultural activities. The probability of successful breeding is higher in intact forest than that in open habitat with unimodal fashion of peak at 1800m. We found that local climate variability, more specifically, the diurnal temperature range (DTR), impedes successful breeding of N. nepalensis. Despite variable environmental conditions associated with habitat opening, such as increased soil density, reduced leaf litter amount and relative humidity, enlarged DTR seems to be the principal cause of failure. The negative effects of greater DTR on breeding success were confirmed by laboratory experiments. DTR remains stable in primary forests, in contrast to its increase in more disrupted habitats along the same transect. Reducing vegetation cover exposes mountains to radiant heating, a trend with significant elevational effect, resulting in large DTR in high lands. Although N. nepalensis is widely distributed in the mountain areas, non-forest patches support only part of their life cycle, different function groups to support decomposition process at open habitats are expected. Climate change and habitat degradation are among the major drivers of biodiversity loss. Our study highlights land-use and land-cover change (LULCC) in altering local temperature variability and reinforces the concern of its interplay with climate change.
Shih-sen Chang,H.W. Joseph Lee,Chi Kin Chan 한국전산응용수학회 2009 Journal of applied mathematics & informatics Vol.27 No.1
In this paper we present an iterative scheme for finding a com- mon element of the set of zero points of accretive mappings and the set of fixed points of nonexpansive mappings in Banach spaces. By using viscos- ity approximationmethods and under suitable conditions, some strong con- vergence theorems for approximating to this common elements are proved. The results presented in the paper improve and extend the corresponding results of Kim and Xu [Nonlinear Anal. TMA 61 (2005), 51-60], Xu [J. Math. Anal. Appl., 314 (2006), 631-643] and some others. In this paper we present an iterative scheme for finding a com- mon element of the set of zero points of accretive mappings and the set of fixed points of nonexpansive mappings in Banach spaces. By using viscos- ity approximationmethods and under suitable conditions, some strong con- vergence theorems for approximating to this common elements are proved. The results presented in the paper improve and extend the corresponding results of Kim and Xu [Nonlinear Anal. TMA 61 (2005), 51-60], Xu [J. Math. Anal. Appl., 314 (2006), 631-643] and some others.
Damage detection in truss bridges using vibration based multi-criteria approach
Shih, H.W.,Thambiratnam, D.P.,Chan, T.H.T. Techno-Press 2011 Structural Engineering and Mechanics, An Int'l Jou Vol.39 No.2
This paper uses dynamic computer simulation techniques to develop and apply a multi-criteria procedure using non-destructive vibration-based parameters for damage assessment in truss bridges. In addition to changes in natural frequencies, this procedure incorporates two parameters, namely the modal flexibility and the modal strain energy. Using the numerically simulated modal data obtained through finite element analysis of the healthy and damaged bridge models, algorithms based on modal flexibility and modal strain energy changes before and after damage are obtained and used as the indices for the assessment of structural health state. The application of the two proposed parameters to truss-type structures is limited in the literature. The proposed multi-criteria based damage assessment procedure is therefore developed and applied to truss bridges. The application of the approach is demonstrated through numerical simulation studies of a single-span simply supported truss bridge with eight damage scenarios corresponding to different types of deck and truss damage. Results show that the proposed multi-criteria method is effective in damage assessment in this type of bridge superstructure.
Grey Neural Network-Based Forecasting System for Vision-Guided Robot Trajectory Tracking
Shih-Hung Yang,Chung-Hsien Chou,Chen-Fang Chung,Wen-Pang Pai,Tse-Han Liu,Yung-Sheng Chang,Jung-Che Li,Huan-Chan Ting,Yon-Ping Chen 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10
This paper presents a grey neural network-based forecasting system (GNNFS) in solving the prediction problem. GNNFS adopts a grey model to predict the signal and a neural network (NN) to forecast the prediction error of the grey model. A sequential batch learning (SBL) is developed to adjust the weights of the NN. The proposed GNNFS is applied to a binocular robot, called an Eye-Robot, for human-robot interaction which involved predicting the trajectory of a participant’s hand and tracking the hand. By applying the SBL, the GNNFS can gradually learn to predict the trajectory of the hand and track it well. The experimental results show that the GNNFS can carry out the SBL in real-time for vision-guided robot trajectory tracking.
Chang, Shih-Sen,Lee, H.W. Joseph,Chan, Chi Kin The Korean Society for Computational and Applied M 2009 Journal of applied mathematics & informatics Vol.27 No.1
In this paper we present an iterative scheme for finding a common element of the set of zero points of accretive mappings and the set of fixed points of nonexpansive mappings in Banach spaces. By using viscosity approximation methods and under suitable conditions, some strong convergence theorems for approximating to this common elements are proved. The results presented in the paper improve and extend the corresponding results of Kim and Xu [Nonlinear Anal. TMA 61 (2005), 51-60], Xu [J. Math. Anal. Appl., 314 (2006), 631-643] and some others.
The effect of bending loads on the dynamic behaviors of a rolling guide
James Shih-Shyn Wu,Jyh-Cheng Chan,Gent-An Tsai,Ching-Yuan Lin,Feng-Ming Ou 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.3
Dynamic behaviors of ball-type contact surfaces under unbalanced bending loads are studied using point-to-point analysis, threedimensional finite element simulation based on the Hertz Contact Theory, and a modal test. Results derived from these models are very similar but the Finite Element Model provides the best results since it allows for more elements of study, such as the steel ball, carriage,rail etc. In the study, results also show that frequencies vary slightly, but there is an obvious change in shapes. Therefore, the contact stiffness in simulations must be properly selected with the conclusion that different external loadings may affect the dynamic characteristics of such structures significantly.
Chang, Shih-sen,Kim, Jong Kyu,Lee, H. W. Joseph,Chan, Chi Kin Hindawi Publishing Corporation 2011 Fixed point theory and applications Vol.2011 No.1
<P>The purpose of this paper is to study the weak and strong convergence theorems of the implicit iteration process for a countable family of Lipschitzian pseudocontraction mappings in Banach spaces. The results presented in this paper extend and improve some recent results announced by some authors.</P>