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Search Results: 1 - 10 of 22920 matches for " Po-Chih Chang "
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Early Endoscopic Primary Realignment Decreases Stricture Formation and Reduces Medical Costs in Traumatic Complete Posterior Urethral Disruption in A 2-Year Follow-up
Po-Chih Chang,Yu-Chao Hsu,Jia-Jen Shee,Shih-Tsung Huang
Chang Gung Medical Journal , 2011,
Abstract: Background: There are presently several options for the management of posterior urethraldisruption. However, these options remain controversial for several reasons.Thus, this medical issue has been continuously investigated.Methods: From 1991 to 2001, 22 patients with complete posterior urethral disruptionout of 720 urethral injury cases were retrospectively reviewed using strictcriteria. The 22 cases were grouped into two different management groups,the endoscopic early realignment (ER) group and the delayed urethrotomy(DU) group. The frequency of optic internal urethrotomy for urethral stricturesand individual medical costs were evaluated over a two-year period.Results: The ER group had a mean frequency of 1.3
Multiple bowel intussusceptions from metastatic localized malignant pleural mesothelioma: A case report
Hsien Liu, Yu-Jen Cheng, Hsin-Pao Chen, Jau-Chung Hwang, Po-Chih Chang
World Journal of Gastroenterology , 2010,
Abstract: Localized malignant pleural mesothelioma (LMPM) is a rare occurrence, and gastrointestinal intra-luminal metastases have not previously been reported. Herein, we report a patient with LMPM who presented with a local recurrence 10 mo after initial en bloc surgical resection. Abdominal computed tomography was performed for intractable, vague abdominal pain with episodic vomiting, which showed a “target sign” over the left lower quadrant. Laparotomy revealed several intra-luminal metastatic tumors in the small intestine and colon and a segmental resection of metastatic lesions was performed. Unfortunately, the patient died of sepsis despite successful surgical intervention. Though local recurrence is more frequent in LMPM, the possibility of distant metastasis should not be ignored in patients with non-specific abdominal pain.
In-plane strain measurement by digital image correlation
Hung, Po-Chih;Voloshin, A. S.;
Journal of the Brazilian Society of Mechanical Sciences and Engineering , 2003, DOI: 10.1590/S1678-58782003000300001
Abstract: this paper presents a "fast and simple" (fas) detection algorithm based on the digital image correlation for measurement of the surface deformation of planar objects. the proposed algorithm uses only fine search at the pixel level resolution and surface fitting for sub-pixel level. two different specimens are investigated to explore the feasibility of this proposed algorithm. the displacements calculated by the fas algorithm are compared with the ones obtained from newton-raphson method (n-r) and enhanced sequential similarity detection algorithm (essda). the results show that the experimental data are in good agreement with the theoretical solution. the proposed algorithm is found to be much faster than newton-raphson method with inferior, yet reasonable, accuracy for displacement and strain evaluation in the cases of uniaxial tension and disk under diametrical compression tests.
In-plane strain measurement by digital image correlation
Hung Po-Chih,Voloshin A. S.
Journal of the Brazilian Society of Mechanical Sciences and Engineering , 2003,
Abstract: This paper presents a "fast and simple" (FAS) detection algorithm based on the digital image correlation for measurement of the surface deformation of planar objects. The proposed algorithm uses only fine search at the pixel level resolution and surface fitting for sub-pixel level. Two different specimens are investigated to explore the feasibility of this proposed algorithm. The displacements calculated by the FAS algorithm are compared with the ones obtained from Newton-Raphson method (N-R) and Enhanced Sequential Similarity Detection Algorithm (ESSDA). The results show that the experimental data are in good agreement with the theoretical solution. The proposed algorithm is found to be much faster than Newton-Raphson method with inferior, yet reasonable, accuracy for displacement and strain evaluation in the cases of uniaxial tension and disk under diametrical compression tests.
Spatiotemporal Dynamics and Epistatic Interaction Sites in Dengue Virus Type 1: A Comprehensive Sequence-Based Analysis
Pei-Yu Chu, Guan-Ming Ke, Po-Chih Chen, Li-Teh Liu, Yen-Chun Tsai, Jih-Jin Tsai
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0074165
Abstract: The continuing threat of dengue fever necessitates a comprehensive characterisation of its epidemiological trends. Phylogenetic and recombination events were reconstructed based on 100 worldwide dengue virus (DENV) type 1 genome sequences with an outgroup (prototypes of DENV2-4). The phylodynamic characteristics and site-specific variation were then analysed using data without the outgroup. Five genotypes (GI-GV) and a ladder-like structure with short terminal branch topology were observed in this study. Apparently, the transmission of DENV1 was geographically random before gradual localising with human activity as GI-GIII in South Asia, GIV in the South Pacific, and GV in the Americas. Genotypes IV and V have recently shown higher population densities compared to older genotypes. All codon regions and all tree branches were skewed toward a negative selection, which indicated that their variation was restricted by protein function. Notably, multi-epistatic interaction sites were found in both PrM 221 and NS3 1730. Recombination events accumulated in regions E, NS3-NS4A, and particularly in region NS5. The estimated coevolution pattern also highlights the need for further study of the biological role of protein PrM 221 and NS3 1730. The recent transmission of emergent GV sublineages into Central America and Europe mandates closely monitoring of genotype interaction and succession.
A Charge Pump Circuit by using Voltage-Doubler as Clock Scheme
Wen Chang Huang,Jin Chang Cheng,Po Chih Liou
International Journal of Design, Analysis and Tools for Integrated Circuits and Systems , 2011,
Abstract: A new charge pump circuit with a clock that shows an increased clock voltage as its stage is increased is proposed in the paper. The charge pump circuit utilizes the cross-connected NMOS, voltage doubler, as a pumping stage. Each stage of the voltage-doubler provides a pair of complementary clock voltages.The clock voltage also increases as the stage of voltage doubler is increased. It shows that a voltage up to 37.85V was obtained after eight-stage's pumping of the circuit, through the simulation of HSpice under 0.35 um process with 2V of supply voltage and clock voltage.
An IoT Multi-Interface Gateway for Building a Smart Space  [PDF]
Chao-Tsun Chang, Chih-Yung Chang, Kuei-Ping Shih, Ramon Dario Borja Martinez, Po-Ting Chen, Yen-Da Chen
Open Journal of Social Sciences (JSS) , 2015, DOI: 10.4236/jss.2015.37010
Abstract:

Connecting smart objects in a wireless manner can establish an Internet of Things (IoT) smart space. However, a variety of wireless technologies have been embedded into smart objects that they cannot exchange information since they apply different standards. To provide information exchange in heterogeneous networks, this paper designs an IoT multi-interface gateway, which can be used in some smart spaces to automatically control traditional TV, air condition, smart meter, sphygmomanometer, smart phone, etc.

Extraction of single-trial cortical beta oscillatory activities in EEG signals using empirical mode decomposition
Chia-Lung Yeh, Hsiang-Chih Chang, Chi-Hsun Wu, Po-Lei Lee
BioMedical Engineering OnLine , 2010, DOI: 10.1186/1475-925x-9-25
Abstract: This paper presents an empirical mode decomposition (EMD)-based spatiotemporal approach to extract neural oscillatory activities from multi-channel electroencephalograph (EEG) data. The efficacy of this approach manifests in extracting single-trial post-movement beta activities when performing a right index-finger lifting task. In each single trial, an EEG epoch recorded at the channel of interest (CI) was first separated into a number of intrinsic mode functions (IMFs). Sensorimotor-related oscillatory activities were reconstructed from sensorimotor-related IMFs chosen by a spatial map matching process. Post-movement beta activities were acquired by band-pass filtering the sensorimotor-related oscillatory activities within a trial-specific beta band. Signal envelopes of post-movement beta activities were detected using amplitude modulation (AM) method to obtain post-movement beta event-related synchronization (PM-bERS). The maximum amplitude in the PM-bERS within the post-movement period was subtracted by the mean amplitude of the reference period to find the single-trial beta rebound (BR).The results showed single-trial BRs computed by the current method were significantly higher than those obtained from conventional average method (P < 0.01; matched-pair Wilcoxon test). The proposed method provides high signal-to-noise ratio (SNR) through an EMD-based decomposition and reconstruction process, which enables event-related oscillatory activities to be examined on a single-trial basis.The EMD-based method is effective for artefact removal and extracting reliable neural features of non-phase-locked oscillatory activities in multi-channel EEG data. The high extraction rate of the proposed method enables the trial-by-trial variability of oscillatory activities can be examined, which provide a possibility for future profound study of subtle brain dynamics.Neural network in the human brain is a dynamic system, responding to external or internal trigger events in a fractio
Protein structural similarity search by Ramachandran codes
Wei-Cheng Lo, Po-Jung Huang, Chih-Hung Chang, Ping-Chiang Lyu
BMC Bioinformatics , 2007, DOI: 10.1186/1471-2105-8-307
Abstract: We propose a new linear encoding method, SARST (Structural similarity search Aided by Ramachandran Sequential Transformation). SARST transforms protein structures into text strings through a Ramachandran map organized by nearest-neighbor clustering and uses a regenerative approach to produce substitution matrices. Then, classical sequence similarity search methods can be applied to the structural similarity search. Its accuracy is similar to Combinatorial Extension (CE) and works over 243,000 times faster, searching 34,000 proteins in 0.34 sec with a 3.2-GHz CPU. SARST provides statistically meaningful expectation values to assess the retrieved information. It has been implemented into a web service and a stand-alone Java program that is able to run on many different platforms.As a database search method, SARST can rapidly distinguish high from low similarities and efficiently retrieve homologous structures. It demonstrates that the easily accessible linear encoding methodology has the potential to serve as a foundation for efficient protein structural similarity search tools. These search tools are supposed applicable to automated and high-throughput functional annotations or predictions for the ever increasing number of published protein structures in this post-genomic era.The number of proteins found in structural databases has increased at such an unprecedented rate in recent years that achieving speed and accuracy simultaneously in protein structure similarity searches has become a formidable task. During evolution, three-dimensional (3D) structures are more conserved than amino acid sequences [1], and protein homologs that share highly conserved 3D structures may have unrecognizable sequence homology [2]. Amino acid sequence search tools are fast; however, they have proven to be insufficient for detection of remote homology in structural databases [3]. Structure alignment using delicate geometric algorithms is much more accurate than amino acid sequence compar
A Macroporous TiO2 Oxygen Sensor Fabricated Using Anodic Aluminium Oxide as an Etching Mask
Chih-Cheng Lu,Yong-Sheng Huang,Jun-Wei Huang,Chien-Kuo Chang,Sheng-Po Wu
Sensors , 2010, DOI: 10.3390/s100100670
Abstract: An innovative fabrication method to produce a macroporous Si surface by employing an anodic aluminium oxide (AAO) nanopore array layer as an etching template is presented. Combining AAO with a reactive ion etching (RIE) processes, a homogeneous and macroporous silicon surface can be effectively configured by modulating AAO process parameters and alumina film thickness, thus hopefully replacing conventional photolithography and electrochemical etch methods. The hybrid process integration is considered fully CMOS compatible thanks to the low-temperature AAO and CMOS processes. The gas-sensing characteristics of 50 nm TiO2 nanofilms deposited on the macroporous surface are compared with those of conventional plain (or non-porous) nanofilms to verify reduced response noise and improved sensitivity as a result of their macroporosity. Our experimental results reveal that macroporous geometry of the TiO2 chemoresistive gas sensor demonstrates 2-fold higher (~33%) improved sensitivity than a non-porous sensor at different levels of oxygen exposure. In addition, the macroporous device exhibits excellent discrimination capability and significantly lessened response noise at 500 °C. Experimental results indicate that the hybrid process of such miniature and macroporous devices are compatible as well as applicable to integrated next generation bio-chemical sensors.
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