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Search Results: 1 - 10 of 85578 matches for " Hung-Wen Yang "
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Design of Feedforward Compensator for the Travelling Wave Ultrasonic Motor Based on Non-uniform Rational B-splines Curve Neural Network
Hung-Wen Wu,Ming-Yang Cheng
Information Technology Journal , 2010,
Abstract: In this study, a novel feedforward compensator which is based on the non-uniform rational B-splines (NURBS) curve neural network (NURBSCNN), is developed for the travelling wave ultrasonic motor (TWUSM). The proposed NURBSCNN consists of three hidden layers, in which the blending functions are adopted as the activation functions for the neurons in the first hidden layer rather than the commonly used sigmoid functions. Simulations are performed to demonstrate the feasibility of the proposed schemes. Simulation results reveal that the proposed design approach exhibits satisfactory performance.
Comparative Studies of Finite Element Model of Frontal Impact Dummy
Tso-Liang Teng,Hung-Wen Lan,Ming Yang
Information Technology Journal , 2007,
Abstract: In order to make valid tests of protective systems, the human body is needed to test the system concepts and evaluate the protective efforts in crash testing. Practical and ethical concerns also restrict the use of actual occupants for risk assessment. The anthropomorphic test dummies have been demonstrated to be highly repeatable, reproducible, durable and serviceable test devices. These test dummies thus have been widely used in numerous applications related to human dynamic simulations. In order to understand the dummy model components and offer validated finite element models for these crash simulations, this study investigates four types of finite element models of the frontal impact dummy. All dummies are calibrated based on FMVSS 49 part 572 regulations test procedures. For comparing the difference between these dummy models, sled test simulations are performed using the LS-DYNA finite element code. The dynamic responses of dummy models are measured and compared. The finite element dummy models obtained here have potential for evaluating vehicle crash safety and guiding the future development of safety technologies.
CONVERTIBLE DRM SYSTEM BASED ON IDENTITY-BASED ENCRYPTION
Chou-Chen Yang,Ju-Chun Hsiao,Hung-Wen Yang,Jyun-Yi Jiang
International Journal of Computer Networks & Communications , 2009,
Abstract: With the rapid growth of the Internet, acquiring digital contents over the Internet has becomecommonplace. Most traditional items can be translated into digital form. That is to say the digitalcontents can be distributed easily and rapidly to users over the Internet. Unfortunately, situations ofpiracy are common and become more serious, since the digital contents can be copied and distributedeasily through Internet. Thus, Digital Rights Management (DRM) is a popular tool used to protect digitalcontents with cryptographic technology. But there are many different DRM encryption formats that areadopted by different content providers, causing consumers can’t play their contents on devices withdifferent DRM format even though they bought it legally. In this paper, we employ identity-basedencryption to allow a conversion between different DRM systems. Through the conversion process, thedigital content can be used at different DRM systems and hold the legitimate use of the right.
Cryptanalysis of Security Enhancement for Anonymous Secure E-voting over a Network
Chou-Chen Yang,Hung-Wen Yang,Ren-Chiun Wang
Journal of Applied Sciences , 2005,
Abstract: In 1998, Mu and Varadharajan proposed an anonymous secure e-voting scheme over a network. Unfortunately, many researches have pointed out that Mu and Varadharajan`s scheme was not secure. Attackers can easily forge a valid ballot and can vote more than once. Later, Lin et al. proposed a scheme that improved upon Mu`s scheme. Lin et al. claimed that their scheme can not only prevent double voting but can also defend against attacks from conspiring parties. In this study, we shall show that Lin et al. scheme still can not prevent double voting and can not detect forged ballots. A voter can vote more than once without being detected. Moreover, an attacker can forge valid tickets and pass the verification of authentication server.
Improvement of Fixing Problems in Lin et al.`s OSPA Protocol
Jau-Ji Shen,Ching-Ying Lin,Hung-Wen Yang
Journal of Applied Sciences , 2006,
Abstract: Recently, Yoon et al. proposed an improved scheme to solve the problems of replay attack and denial of service attack in the Lin et al.`s OSPA scheme. Their scheme can simply update user password, provides mutual authentication between the user and remote server and has more efficient performance by reducing the number of hash operations. In this study, an improved scheme is shown to be vulnerable to the insider attack and smart card loss problem and propose an enhancement of the protocol to solve these problems.
Cryptanalysis of a New Efficient MAKEP for Wireless Communications
Jau-Ji Shen,Ching-Ying Lin,Hung-Wen Yang
International Journal of Network Security , 2005,
Abstract: In 2001, Wong and Chan proposed two mutual authentication and key exchange protocols (MAKEP) for low power wireless communications, which were suitable for establishing secure communications between a low-power wireless device and a powerful base station. Unfortunately, Shim pointed out Wong and Chan's schemes were incurred the unknown key-shared attack, then he proposed an improved scheme to overcome this weakness. Later, Jan and Chen found that the improved scheme was vulnerable to the man-in-the-middle attack. Then, they also proposed a new efficient MAKEP in spirit of Girault's method to withstand the above weakness. However, in this paper, we shall show that Jan and Chen's scheme suffered from the forgery attack and the man-in-the-middle attack.
Equilibrating effect of Maxwell-type boundary condition in highly rarefied gas
Hung-Wen Kuo
Mathematics , 2015, DOI: 10.1007/s10955-015-1355-1
Abstract: We study the equilibrating effects of the boundary and intermolecular collision in the kinetic theory for rarefied gases. We consider the Maxwell-type boundary condition, which has weaker equilibrating effect than the commonly studied diffuse reflection boundary condition. The gas region is the spherical domain in $\mathbb{R}^d$, $d=1,2$. First, without the equilibrating effect of collision, we obtain the algebraic convergence rates to the steady state of free molecular flow with variable boundary temperature. The convergence behavior has intricate dependence on the accommodation coefficient of the Maxwell-type boundary condition. Then we couple the boundary effect with the intermolecular collision and study their interaction. We are able to construct the steady state solutions of the full Boltzmann equation for large Knudsen numbers and small boundary temperature variation. We also establish the nonlinear stability with exponential rate of the stationary Boltzmann solutions. Our analysis is based on the explicit formulations of the boundary condition for symmetric domains.
Hematoma Shape, Hematoma Size, Glasgow Coma Scale Score and ICH Score: Which Predicts the 30-Day Mortality Better for Intracerebral Hematoma?
Chih-Wei Wang, Yi-Jui Liu, Yi-Hsiung Lee, Dueng-Yuan Hueng, Hueng-Chuen Fan, Fu-Chi Yang, Chun-Jen Hsueh, Hung-Wen Kao, Chun-Jung Juan, Hsian-He Hsu
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0102326
Abstract: Purpose To investigate the performance of hematoma shape, hematoma size, Glasgow coma scale (GCS) score, and intracerebral hematoma (ICH) score in predicting the 30-day mortality for ICH patients. To examine the influence of the estimation error of hematoma size on the prediction of 30-day mortality. Materials and Methods This retrospective study, approved by a local institutional review board with written informed consent waived, recruited 106 patients diagnosed as ICH by non-enhanced computed tomography study. The hemorrhagic shape, hematoma size measured by computer-assisted volumetric analysis (CAVA) and estimated by ABC/2 formula, ICH score and GCS score was examined. The predicting performance of 30-day mortality of the aforementioned variables was evaluated. Statistical analysis was performed using Kolmogorov-Smirnov tests, paired t test, nonparametric test, linear regression analysis, and binary logistic regression. The receiver operating characteristics curves were plotted and areas under curve (AUC) were calculated for 30-day mortality. A P value less than 0.05 was considered as statistically significant. Results The overall 30-day mortality rate was 15.1% of ICH patients. The hematoma shape, hematoma size, ICH score, and GCS score all significantly predict the 30-day mortality for ICH patients, with an AUC of 0.692 (P = 0.0018), 0.715 (P = 0.0008) (by ABC/2) to 0.738 (P = 0.0002) (by CAVA), 0.877 (P<0.0001) (by ABC/2) to 0.882 (P<0.0001) (by CAVA), and 0.912 (P<0.0001), respectively. Conclusion Our study shows that hematoma shape, hematoma size, ICH scores and GCS score all significantly predict the 30-day mortality in an increasing order of AUC. The effect of overestimation of hematoma size by ABC/2 formula in predicting the 30-day mortality could be remedied by using ICH score.
Simultaneous evaluation of abstinence and relapse using a Markov chain model in smokers enrolled in a two-year randomized trial
Hung-Wen Yeh, Edward F Ellerbeck, Jonathan D Mahnken
BMC Medical Research Methodology , 2012, DOI: 10.1186/1471-2288-12-95
Abstract: We apply a first-order Markov chain model to analyze the transition of smoking status measured every 6?months in a 2-year randomized smoking cessation trial, and to identify what factors are associated with the transition from smoking to abstinent and from abstinent to smoking. Missing values due to non-response are assumed non-ignorable and handled by the selection modeling approach.Smokers receiving high-intensity disease management (HDM), of male gender, lower daily cigarette consumption, higher motivation and confidence to quit, and having serious attempts to quit were more likely to become abstinent (OR?=?1.48, 1.66, 1.03, 1.15, 1.09 and 1.34, respectively) in the next 6?months. Among those who were abstinent, lower income and stronger nicotine dependence (OR?=?1.72 for???vs. > 40?K and OR?=?1.75 for first cigarette???vs. > 5?min) were more likely to have relapse in the next 6?months.Markov chain models allow investigation of dynamic smoking-abstinence behavior and suggest that relapse is influenced by different factors than cessation. The knowledge of treatments and covariates in transitions in both directions may provide guidance for designing more effective interventions on smoking cessation and relapse prevention. Trial Registration clinicaltrials.gov identifier: NCT00440115
Analysis of Perpendicular Crossing Dielectric Waveguides with Various Typical Index Contrasts and Intersection Profiles
Hung-Wen Chang;Yan-Huei Wu
PIER , 2010, DOI: 10.2528/PIER10081008
Abstract: We present a rigorous 2D numerical study of the transmission, reflection and crosstalk coefficients of the perpendicular, identical dielectric crossing waveguide with various core-cladding index contrasts for both TE and TM polarizations. Our method is based on a hybrid frequency-domain finite-difference (FD-FD) technique computed with the cross-symmetry model. By varying the intersection profile, such as the circular, filleted, tapered and elliptical shapes, we achieve, even for a large 3.5 to 1.5 index ratio, a low 0.25dB insertion loss, a nontrivial reduction over the straight direct crossing case.
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