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( Yuan-yu Tsai ),( Jian-ting Chen ),( Yin-chi Kuo ),( Chi-shiang Chan ) 한국인터넷정보학회 2014 KSII Transactions on Internet and Information Syst Vol.8 No.9
Jung and Yoo proposed the first image interpolation-based reversible data hiding algorithm. Although their algorithm achieved superior interpolation results, the embedding capacity was insufficient. Lee and Huang proposed an improved algorithm to enhance the embedding capacity and the interpolation results. However, these algorithms present limitations to magnify the original image to any resolution and pixels in the boundary region of the magnified image are poorly manipulated. Furthermore, the capacity and the image quality can be improved further. This study modifies the pixel mapping scheme and adopts a bilinear interpolation to solve boundary artifacts. The modified reference pixel determination and an optimal pixel adjustment process can effectively enhance the embedding capacity and the image quality. The experimental results show our proposed algorithm achieves a higher embedding capacity under acceptable visual distortions, and can be applied to a magnified image at any resolution. Our proposed technique is feasible in reversible data hiding.
Yu-Jen Chen,Guo-Yuan Huang,Y. C. Shiah,Yi-Lun Tsai 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.7 No.1
In this paper, a theoretical study on the performance of a small horizontal axis wind turbine (HAWT) is presented. This research aims to establish a reliable assessment platform for the small HAWT, upon which the design and dynamic analysis for turbine blades and axial-flux permanent magnet generator can be expediently carried out. The predicted results were verified by experiments undertaken in a wind tunnel as well as in outdoor environment. By adopting the model without involving any time-consuming computer simulations, various performance curves were obtained for different designs. Graphical user interface software implementing the proposed model has been developed to facilitate the performance assessment of the complete HAWT system. As a powerful and expedient tool, the developed software helps engineers effectively design a turbine system to be compatible with operation environment.
Fabrication and Study of Novel Piezoresistive Polymer Composites Sensor for 3D Printing Applications
( Yu-yen Chen ),( Cheng-chun Huang ),( Ching-yuan Su ),( Yao-chuan Tsai ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
With the technology development, the technique of 3D printing has gradually matured. The characteristic of 3D printing is that it can print the product directly without another complex process. If the 3D printing could be applied to manufacturing sensor elements, it could be quicker and cheaper for the sensor element fabrication and the sensor forms will be applicable. Piezoresistive effect is a common sensor sensing principle which is through the deformation of the material to cause the resistance changes. In this study, a piezoresistive polymer composites material was developed, which can be manufactured by the photo-curable 3D printing. The different amount of the conductive carbon black (CB) nanoparticles was employed and added into photo-curable resin for obtaining the conductive percolation threshold of the polymer composites and measuring the piezoresistivity of the polymer composites. The conductive percolation threshold is around 1.0~1.5wt%, and the gauge factor of 1.5wt% is 9~17. The gauge factor was found which would decrease with the increasing strains. This study can be applied on fabricating the piezoresistive pressure and tactile sensors which can be used to the agricultural, industrial and various industries.
( Tzi Yuan Wang ),( Yi Hsuan Tsai ),( I Zen Yu ),( Te Sheng Chang ) 한국미생물 · 생명공학회 2016 Journal of microbiology and biotechnology Vol.26 No.3
3`-Hydroxygenistein can be obtained from the biotransformation of genistein by the engineered Pichia pastoris X-33 strain, which harbors a fusion gene composed of CYP57B3 from Aspergillus oryzae and a cytochrome P450 oxidoreductase gene (sCPR) from Saccharomyces cerevisiae. P. pastoris X-33 mutants with higher 3`-hydroxygenistein production were selected using a periodic hydrogen peroxide-shocking strategy. One mutant (P2-D14-5) produced 23.0 mg/l of 3`-hydroxygenistein, representing 1.87-fold more than that produced by the recombinant X-33. When using a 5 L fermenter, the P2-D14-5 mutant produced 20.3 mg/l of 3`-hydroxygenistein, indicating a high potential for industrial-scale 3`-hydroxygenistein production.
An Integration of Kano's Model and Exit-Voice Theory : A Case Study
Lee, Yu-Cheng,Hu, Hsiu-Yuan,Yen, Tieh-Min,Tsai, Chih-Hung The Korean Society for Quality Management 2009 The Asian Journal on Quality Vol.10 No.2
The purpose of this study was to examine overall customer satisfaction associated with medical service quality in Taiwan by integrated Kano's model and customer satisfaction index model. Another purpose was to confirmed nonlinear and asymmetric relationship of Customer Satisfaction and Quality Performance by the research outcome. By analyzing 1,100 patients or their family members, this study used the structural equation model (SEM) with AMOS software for data analysis. The results show that must-be attributes, one-dimensional attributes and attractive attributes had a direct effect on overall customer satisfaction, Surprisingly, overall customer satisfaction had positively influenced customer loyalty customer satisfaction had negatively influenced customer complaints. The study also found that customer complaints have direct effect on customer loyalty. Importantly, the study found out the must-be attributes, the attractive attributes and one-dimensional attributes increased, the level of overall customer satisfaction also increased. The customer satisfaction positively influences customer loyalty in medical service quality in Taiwan. The findings might reveal new insights for researchers dealing with quality of medical service and for hospital managers who devote resources exclusively to achieving highest possible levels of patient satisfaction.
Nai-Yu Wang,Chung-Yu Tsai,Yuan-Yuarn Liu,I-Shu Chen,Kai-Hung Ho 대한위암학회 2019 Journal of gastric cancer Vol.19 No.1
The occurrence of hiatal hernia after total gastrectomy with Roux-en-Y reconstruction is rare. We report the case of a 76-year-old man who presented with dyspnea, vomiting, and fever around 8 days after total gastrectomy with Roux-en-Y reconstruction. Abdominal computed tomography revealed a hiatal hernia containing part of the small intestine in the left thoracic cavity. Emergent reduction and repair of the hiatal hernia were performed later. Operative findings revealed that the Roux limb was incarcerated in the left pleural cavity. Esophagojejunostomy leakage, perforation of the small intestine with transient ischemic change, and pyothorax were also found. Thus, feeding jejunostomy, thoracoscopic decortication, and diversion T-tube esophagostomy were performed. Considering that the main cause of hiatal hernia is blunt dissection with division of the phrenoesophageal membrane, approximating the crus with 1 or 2 figure-8 sutures, according to the size of the defect, to prevent the incidence of hiatal hernia after total gastrectomy may be performed.
Molecular structure and developmental expression of zebrafish atp2a genes
Yen-Yu Lai,Chiung-Wen Pai,I-Ting Tsai,Chi-Yuan Chou,Chia-Ti Tsai,Yau-Hung Chen 한국유전학회 2011 Genes & Genomics Vol.33 No.5
We isolated two atp2a genes, atp2a1 and atp2a2a, from embryonic zebrafish. Amino acid sequences deduced from zebrafish atp2a genes are aligned with orthologue proteins from other species, the results showed that they share high percentage of identities (82%-94%) and acidic pIs (5.03-5.33). Whole mount in situ hybridization experiments showed that atp2a1and atp2a2a are maternal inherited genes which can be detected at 1-cell stage embryos and express in the entire animal pole from 6 hours post-fertilization (hpf) to 12 hpf. At the later stages (48-96 hpf), expression of atp2a1 was restricted in head and trunk muscles as well as in some neurons. In contrast to the strongly expression of atp2a1 in head muscle,expression of atp2a2a was detected in head muscle in a fainter manner. In addition, transcripts of atp2a2a were observed in the developing heart during early cardiogenesis. The present studies not only help us to comparatively analyze atp2a genes across species, but also provide useful information about expressions during early embryogenesis that will help in further investigations of functional studies of Atp2a in the future.