Bio Jourdeness International Group Co. and National University of Tainan | Date: 2016-05-11
A composite comprising 3-hydroxygenistein and a use for inhibition of melanogenesis are revealed herein. An effective dose of 3-hydroxygenistein is applied to skin for inhibition of tyrosinase activity and further inhibition of melanogensis, so that 3-hydroxygenistein can be used in cosmetic composition.
Shieh B.-S.,National University of Tainan
Information Sciences | Year: 2011
The work examines the feasibility of minimizing a linear objective function subject to a max-t fuzzy relation equation constraint, where t is a continuous/Archimedean t-norm. Conventional methods for solving this problem are significantly improved by, first separating the problem into two sub-problems according to the availability of positive coefficients. This decomposition is thus more easily handled than in previous literature. Next, based on use of the maximum solution of the constraint equation, the sub-problem with non-positive coefficients is solved and the size of the sub-problem with positive coefficients reduced as well. This step is unique among conventional methods, owing to its ability to determine as many optimal variables as possible. Additionally, several rules are developed for simplifying the remaining problem. Finally, those undecided optimal variables are obtained using the covering problem rather than the branch-and-bound methods. Three illustrative examples demonstrate that the proposed approach outperforms conventional schemes. Its potential applications are discussed as well. © 2010 Elsevier Inc. All rights reserved.
Yeh C.-T.,National University of Tainan
Fuzzy Sets and Systems | Year: 2011
Recently, many scholars investigated interval, triangular, and trapezoidal approximations of fuzzy numbers. These publications can be grouped into two classes: Euclidean distance class and non-Euclidean distance class. Most approximations in Euclidean distance class can be calculated by formulas, but calculating approximations in the other class is more complicated. In the present paper, we study a special class of non-linear approximations with respect to a weighted Euclidean distance. We call it "weighted semi-trapezoidal approximations". The proposed approximations generalize all recent approximations in Euclidean distance class. First, we embed fuzzy numbers into a Hilbert space. Then compute weighted semi-trapezoidal approximations by means of best approximations in a closed convex subset of the Hilbert space. Finally, we propose formulas of matrix type, which is more clear than the previous contributions. © 2010 Elsevier B.V. All rights reserved.
Hwang J.-J.,National University of Tainan
Journal of Power Sources | Year: 2013
The objective of the present paper is to conduct an experimental work to measure transient thermal/electrical efficiencies in a combined heat and power (CHP) fuel cell generator. An original-designed fuel cell CHP generator comprising a proton exchange membrane (PEM) fuel cell system, a power conditioning system, and a thermal recovery system is constructed. The thermal recovery system recaptures the thermal energy dissipated by the fuel cell stack, while the power conditioning system distributes the electrical power of the fuel cell system. Performance matrices including stack electrical efficiency, system electrical efficiency, thermal efficiency, and CHP efficiency are presented. Particular attention is placed on the variation of transient system efficiencies as the load is changed drastically. The time-averaged system efficiency is then concluded from the statistics of the transient system efficiency. Results show that the time-averaged efficiencies in electrical, thermal and CHP are about 37%, 24%, and 61%, respectively, under 55% electrical power capacity of the generator. The instantaneous CHP efficiency could reach as high as 85% in the loading period. © 2012 Elsevier B.V. All rights reserved.
Hsu C.-L.,National University of Tainan |
Chang S.-J.,National Cheng Kung University
Small | Year: 2014
In the past decades, the doping of ZnO one-dimensional nanostructures has attracted a great deal of attention due to the variety of possible morphologies, large surface-to-volume ratios, simple and low cost processing, and excellent physical properties for fabricating highperformance electronic, magnetic, and optoelectronic devices. This article mainly concentrates on recent advances regarding the doping of ZnO one-dimensional nanostructures, including a brief overview of the vapor phase transport method and hydrothermal method, as well as the fabrication process for photodetectors. The dopant elements include B, Al, Ga, In, N, P, As, Sb, Ag, Cu, Ti, Na, K, Li, La, C, F, Cl, H, Mg, Mn, S, and Sn. The various dopants which act as acceptors or donors to realize either p-type or n-type are discussed. Doping to alter optical properties is also considered. Lastly, the perspectives and future research outlook of doped ZnO nanostructures are summarized. © 2014 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.
Hwang J.J.,National University of Tainan
Renewable and Sustainable Energy Reviews | Year: 2012
The current development of fuel cell scooters has been reviewed in this paper. Fuel cell scooters, by nature, have zero emissions, and they have the potential to replace current petroleum-propelled engine scooters. First, the fundamentals of fuel cells, including the critical technologies pertaining to fuel cell engines and hydrogen storage, were introduced. Then, the technical feasibility of fuel cell scooters was discussed in parallel with the hydrogen infrastructure model. The accomplishments of fuel cell scooters in Taiwan were presented. Moreover, the contribution of replacing petrol scooters by hydrogen fuel cell scooters to reduction in greenhouse gas (GHG) emission and energy conservation was evaluated. Furthermore, industrial competition with regard to the development of fuel cell scooters was discussed on the basis of a strengths, weaknesses, opportunities, and threats (SWOT) analysis. In conclusion, with mature fuel cell technology together with solid foundation of the scooter industry, Taiwan offers conditions that were conducive for the development of fuel cell scooters. Its social and technical capability will be proved on account of the leading demonstrations of fuel cell scooters in the world. If it can develop a successful business model, Taiwan could enjoy the advantages of tapping the huge global market for zero-emission scooters. © 2012 Elsevier Ltd. All right reserved.
Hwang J.J.,National University of Tainan
Renewable and Sustainable Energy Reviews | Year: 2010
On June 12, 2009, Taiwan government approved a bill of "Statute for Renewable Energy Development", which aimed at promoting the use of renewable energy, boosting energy diversification, and helping reduce greenhouse gases. The new act caps the subsidies for renewable energy up to 10 GW within 20 years. It authorizes the government to enhance incentives for the development of renewable energy via a variety of methods, including the acquisition mechanisms, incentives for demonstration projects, and the loosening of regulatory restrictions. According to the subsidies of the Statute, the share of power capacity of renewable energies will be triple of the nationwide power installation capacity by 2029. The purpose of this paper is to present an updated overview of promotional policy of renewable energy in Taiwan, in addition to evaluate the growth space of individual renewable energies in the post-Statute era by considering the technology development, domestic conditions, and indigenous industries related to renewable energy. © 2009 Elsevier Ltd. All rights reserved.
Tseng D.-Y.,National University of Tainan
Mitochondrial DNA | Year: 2013
In this study, the complete mitogenome sequence of Onychostoma barbata has been determined using long polymerase chain reaction method. The mitogenome, consisting of 16,592 base pairs (bp), had the typical vertebrate mitochondrial gene arrangement, including 13 protein-coding, 22 transfer RNAs, 2 ribosomal RNAs genes, and a noncoding control region (CR). CR of 937 bp lengths long is located between tRNAPro and tRNAPhe. The overall base composition of O. barbata is 24.49% for T, 28.04% for C, 31.54% for A, and 15.94% for G, with a slight AT bias of 56.03%. © 2012 Informa UK, Ltd.
Hwang G.-J.,National Taiwan University of Science and Technology |
Chang H.-F.,National University of Tainan
Computers and Education | Year: 2011
The advancement of mobile and wireless communication technologies has encouraged an increasing number of studies concerning mobile learning, in which students are able to learn via mobile devices without being limited by space and time; in particular, the students can be situated in a real-world scenario associated with the learning content. Although such an approach seems interesting to the students, researchers have emphasized the need for well-designed learning support in order to improve the students' learning achievements. Therefore, it has become an important issue to develop methodologies or tools to assist the students to learn in a mobile learning environment. Based on this perspective, this study proposes a formative assessment-based approach for improving the learning achievements of students in a mobile learning environment. A mobile learning environment has been developed based on this approach, and an experiment on a local culture course has been conducted in southern Taiwan to evaluate its effectiveness. The experimental results show that the proposed approach not only promotes the students' learning interest and attitude, but also improves their learning achievement. © 2010 Elsevier Ltd. All rights reserved.
National University of Tainan | Date: 2014-10-01
A passive anode gas recovery system for fuel cells is revealed. The system includes a fuel cell, a fuel supply device, an electronically controlled regulator, a first ejection module, a second ejection module, a hydrogen recovery module, and a controller. The system is a passive fuel recovery system disposed on an outlet end of an anode of the fuel cell. By the controller, the hydrogen recovery module recovers unconsumed hydrogen gas in the fuel cell provided by the fuel supply device into two ejection modules with different orifice diameters for recycling and reuse. The system has advantages of low cost, no extra energy consumed, and no external controller required. The system can be applied to developing fuel cell systems with high efficiency and low cost.