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Search Results: 1 - 10 of 55549 matches for " Tian-Yau Wu "
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Multi-Scale Analysis Based Ball Bearing Defect Diagnostics Using Mahalanobis Distance and Support Vector Machine
Shuen-De Wu,Chiu-Wen Wu,Tian-Yau Wu,Chun-Chieh Wang
Entropy , 2013, DOI: 10.3390/e15020416
Abstract: The objective of this research is to investigate the feasibility of utilizing the multi-scale analysis and support vector machine (SVM) classification scheme to diagnose the bearing faults in rotating machinery. For complicated signals, the characteristics of dynamic systems may not be apparently observed in a scale, particularly for the fault-related features of rotating machinery. In this research, the multi-scale analysis is employed to extract the possible fault-related features in different scales, such as the multi-scale entropy (MSE), multi-scale permutation entropy (MPE), multi-scale root-mean-square (MSRMS) and multi-band spectrum entropy (MBSE). Some of the features are then selected as the inputs of the support vector machine (SVM) classifier through the Fisher score (FS) as well as the Mahalanobis distance (MD) evaluations. The vibration signals of bearing test data at Case Western Reserve University (CWRU) are utilized as the illustrated examples. The analysis results demonstrate that an accurate bearing defect diagnosis can be achieved by using the extracted machine features in different scales. It can be also noted that the diagnostic results of bearing faults can be further enhanced through the feature selection procedures of FS and MD evaluations.
Computer-Aided Diagnosis of Skin Lesions Using Conventional Digital Photography: A Reliability and Feasibility Study
Wen-Yu Chang, Adam Huang, Chung-Yi Yang, Chien-Hung Lee, Yin-Chun Chen, Tian-Yau Wu, Gwo-Shing Chen
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0076212
Abstract: Background Computer-aided diagnosis (CADx) software that provides a second opinion has been widely used to assist physicians with various tasks. In dermatology, however, CADx has been mostly limited to melanoma or melanocytic skin cancer diagnosis. The frequency of non-melanocytic skin cancers and the accessibility of regular digital macrographs have raised interest in developing CADx for broader applications. Objectives To investigate the feasibility of using CADx to diagnose both melanocytic and non-melanocytic skin lesions based on conventional digital photographic images. Methods This study was approved by an institutional review board, and the requirement to obtain informed consent was waived. In total, 769 conventional photographs of melanocytic and non-melanocytic skin lesions were retrospectively reviewed and used to develop a CADx system. Conventional and new color-related image features were developed to classify the lesions as benign or malignant using support vector machines (SVMs). The performance of CADx was compared with that of dermatologists. Results The clinicians' overall sensitivity, specificity, and accuracy were 83.33%, 85.88%, and 85.31%, respectively. New color correlation and principal component analysis (PCA) features improved the classification ability of the baseline CADx (p = 0.001). The estimated area under the receiver operating characteristic (ROC) curve (Az) of the proposed CADx system was 0.949, with a sensitivity and specificity of 85.63% and 87.65%, respectively, and a maximum accuracy of 90.64%. Conclusions We have developed an effective CADx system to classify both melanocytic and non-melanocytic skin lesions using conventional digital macrographs. The system's performance was similar to that of dermatologists at our institute. Through improved feature extraction and SVM analysis, we found that conventional digital macrographs were feasible for providing useful information for CADx applications. The new color-related features significantly improved CADx applications for skin cancer.
The Reconstruction Strategies of Vrisa, Greece after the 2017 Earthquake  [PDF]
Fangning Wu, Yinsheng Tian
World Journal of Engineering and Technology (WJET) , 2018, DOI: 10.4236/wjet.2018.62B003
This paper focuses on a small Greek village named Vrisa and a specific condition of Lesbos as the arrival island for hundreds of thousands of refugees, aiming to reconsider places in state of emergency and think of flexible future reconstruction strategies which are able to adapt to the new unpredictable conditions of post-disaster. After the 2017 earthquake, the buildings in Vrisa were marked with red, yellow and green which shows different levels of damage. Also, there are some regulations to restrict the fa?ade, square meter, decoration and funding of rebuilding. By analyzing the characteristics of Vrisa village before earthquake and situation after earthquake, we came up with three reconstruction strategies from different aspects to find solutions. Meanwhile, this paper hopes to provide a reference and suggestions for similar cases of post-earthquake reconstruction.
A Construction of stable bundles and reflexive sheaves on Calabi-Yau threefolds
Baosen Wu,Shing Tung Yau
Mathematics , 2014,
Abstract: We use Serre construction and deformation to construct stable bundles and reflexive sheaves on Calabi-Yau threefolds.
Periventricular Nodular Heterotopia and Cardiovascular Defects
Chih-Hong Lee,Yau-Yau Wai,Tony Wu
Chang Gung Medical Journal , 2011,
Abstract: Background: Periventricular nodular heterotopia (PNH) is a rare congenital anomaly of thebrain presenting as nodular heterotopia along the paraventricular region. Tencases of PNH complicated by aortic aneurysm have been reported in the literature, and 9 of them also had symptoms of Ehlers-Danlos syndrome(EDS). This study investigated the association of PNH and cardiovascularanomalies in Asians.Methods: Patients with a diagnosis of brain heterotopia on magnetic resonance imagingat Chang Gung Memorial Hospital between 1994 and 2010 were screenedfor both typical PNH and cardiovascular anomalies. The family members ofthe index cases were also evaluated.Results: One family (5 patients) and a sporadic case were found to have both typicalPNH and cardiovascular anomalies. Two of them had aortic root aneurysm,one had aortic regurgitation, and one had minor valvular disease. Twopatients had a history of seizures, but none of them had EDS.Conclusions:Clinical heterogeneity exists in the patients with PNH. Overlap in the symptoms of PNH, cardiovascular anomalies, aortic aneurysm, and EDS werereviewed. EDS is unusual in Asians with PNH. Aortic aneurysm and othervalvular heart diseases are common cardiovascular anomalies in PNHpatients.
Negative Holomorphic curvature and positive canonical bundle
Damin Wu,Shing-Tung Yau
Mathematics , 2015,
Abstract: In this note we show that if a projective manifold admits a K\"ahler metric with negative holomorphic sectional curvature then the canonical bundle of the manifold is ample. This confirms a conjecture of the second author.
Research on Policy Regulation and Realization Path of Ningxia’s Construction of All-for-One Tourism Demonstration Zone  [PDF]
Di Tian, Meifan Wu, Mu Zhang
Modern Economy (ME) , 2018, DOI: 10.4236/me.2018.99097
Abstract: Located at the key spot of the construction of the Silk Road Economic Belt, Ningxia Hui Autonomous Region has abundant natural and cultural resources with relatively small area and small population, and tourism here plays an important role in local economic development. As China vigorously promoted the construction of tourism throughout the nation, the local government actively responded to the call of the state and successfully became the second state-level all-for-one tourism demonstration zone on a province basis, and finally achieved some decent results. In order to summarize the experience on tourism policy of Ningxia, by introducing Nvivo implementation analysis tool, this paper analyzes and summarizes a series of policy documents for the construction of demonstration zone in Ningxia. According to the specific requirements in the Guideline on the Development of All-for-One Tourism released by the State Council, the article encodes the specific policy measures for Ningxia’s development and establishes a node system, pointing out that Ningxia’s policy measures are consistent with the ones formulated at the national level. On this basis, taking the Xixia District of Yinchuan in Ningxia Hui Autonomous Region as an example, the paper analyzes its specific measures and effects of developing regional tourism, and discusses the policy regulation and implementation path that means taking planning and guidance seriously, emphasizing concrete implementation, promoting industrial integration, and paying close attention to tourism supervision.
Phase-Averaged Method Applied to Periodic Flow Between Shrouded Corotating Disks
Shen-Chun Wu,Yau-Ming Chen
International Journal of Rotating Machinery , 2003, DOI: 10.1155/s1023621x03000277
Abstract: This study investigates the coherent flow fields between corotating disks in a cylindrical enclosure. By using two laser velocimeters and a phase-averaged technique, the vortical structures of the flow could be reconstructed and their dynamic behavior was observed. The experimental results reveal clearly that the flow field between the disks is composed of three distinct regions: an inner region near the hub, an outer region, and a shroud boundary layer region. The outer region is distinguished by the presence of large vortical structures. The number of vortical structures corresponds to the normalized frequency of the flow.
Comparison of Extremum-Seeking Control Techniques for Maximum Power Point Tracking in Photovoltaic Systems
Her-Terng Yau,Chen-Han Wu
Energies , 2011, DOI: 10.3390/en4122180
Abstract: Due to Japan’s recent nuclear crisis and petroleum price hikes, the search for renewable energy sources has become an issue of immediate concern. A promising candidate attracting much global attention is solar energy, as it is green and also inexhaustible. A maximum power point tracking (MPPT) controller is employed in such a way that the output power provided by a photovoltaic (PV) system is boosted to its maximum level. However, in the context of abrupt changes in irradiance, conventional MPPT controller approaches suffer from insufficient robustness against ambient variation, inferior transient response and a loss of output power as a consequence of the long duration required of tracking procedures. Accordingly, in this work the maximum power point tracking is carried out successfully using a sliding mode extremum-seeking control (SMESC) method, and the tracking performances of three controllers are compared by simulations, that is, an extremum-seeking controller, a sinusoidal extremum-seeking controller and a sliding mode extremum-seeking controller. Being able to track the maximum power point promptly in the case of an abrupt change in irradiance, the SMESC approach is proven by simulations to be superior in terms of system dynamic and steady state responses, and an excellent robustness along with system stability is demonstrated as?well.
The science assessment in the National Assessment of Educational Progress (NAEP) of USA
Helan WU,Yau-yuen YEUNG,May-hung CHENG
Asia-Pacific Forum on Science Learning and Teaching , 2008,
Abstract: This article provides a brief review on the science assessment in the National Assessment of Educational Progress (NAEP) of USA in the last decade (1996, 2000 and 2005). It focuses on some key elements of the assessment framework and assessment criteria of NAEP and critically examines certain assessment items as selected from those three rounds of assessment exercise. Besides, there is a concise analysis on the educational implications of NAEP.
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