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RISS 인기검색어
- 검색키워드
- 저자 : Tung-Han Chuang (검색결과 4 건)
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( Yung-kun Chuang ),( Tsung-hsin Wu ),( I-chun Tung ),( Han-chun Hsu ),( Suming Chen ),( Chao-yin Tsai ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
Tea is a widely consumed drink among elderly people in Chinese population. The consumption is growing in different ages because of the founding of many handy-tea-drink stores in Taiwan. However, determination of tea quality is still mainly based on sensory evaluation, which lacks of objectivity in science. Near infrared (NIR) spectroscopy, a rapid nondestructive inspection method, has been widely applied for evaluation of internal quality of agricultural products. Because an NIR spectrum of a mixture on first approximation is the linear addition of individual spectra of the constituents in the mixture, such a spectrum thus can be regarded as an assembly of ‘blind sources’ as the proportion of constituents in the samples remains unknown. Independent component analysis (ICA), a multiuse statistical approach originally used to implement ‘blind source separation’ in signal processing, is capable of disassembling the mixture’s signals with only a small loss of information and does not require any additional information from the source. To date, ICA has not been applied to analysis of the internal quality of tea. Therefore, the objective of the current study was to examine internal quality of tea in terms of quantitative approaches using NIR spectroscopy combined with ICA technique. The internal quality-related indices of tea, including tea polyphenols (TP), free amino acids (FAA), water, and pH value were evaluated simultaneously. The results show that ICA with NIR has the potential to be adopted as an effective method for evaluating internal quality of tea.
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Research on Near Infrared Spectroscopy Application for Aflatoxin Testing on Rice
( I-chun Tung ),( Tsung-hsin Wu ),( Han-chun Hsu ),( Suming Chen ),( Chao-yin Tsai ),( Yung-kun Chuang ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
Rice is one of the most important staple food in the world. In many countries, environments with high temperature/humidity may provide favorable conditions for fungal propagation and production of aflatoxins during rice storage. Aflatoxin B<sub>1</sub> (AFB<sub>1</sub>), one of the secondary metabolites produced by Aspergillus flavus and Aspergillus parasiticus, is particularly carcinogenic to humans. People might very likely cause severe illness once rice is contaminated by aflatoxins. Therefore, the objective of this study is to develop a nondestructive method for rapid and accurate detection of the AFB<sub>1</sub> content in rice. In the present study, evaluation of AFB<sub>1</sub> contaminated rice were conducted by using near infrared spectroscopy (NIRS) technique with chemometrics. NIR Spectra and the AFB<sub>1</sub> contents of the artificially contaminated rice samples were measured by FOSS NIRS 6500 spectrometer and LC-MS/MS, respectively. Modified partial least square regression (MPLSR), a commonly used multivariate analysis method was then used to build calibration models. In summary, NIRS associated with chemometrics could provide a useful tool for rapid and accurate detection of AFB<sub>1</sub> content in rice.
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Nickel-Tin Solid-Liquid Inter-Diffusion Bonding
Chen-Chiang Yu,배성재,Pei-Chen Su,Tung-Han Chuang 한국정밀공학회 2014 International Journal of Precision Engineering and Vol.15 No.1
This paper presents a solid liquid inter-diffusion (SLID) bonding process using nickel-tin. By using two metals with different melting points, Ni3Sn4, an intermetallic compound (IMC) at 523K was formed. Unlike pure metal, the IMC can be used in high temperature applications of up to 800K without failure. The formation energy of Ni3Sn4 IMC was calculated to be 23.15 kJ/mol from the experimental result. Compared to the traditional soldering technique, a higher temperature resistance bonding joint can be achieved using the nickel-tin SLID bonding technique.
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Determination of Geographical Origin of Tea using Near Infrared Spectroscopy
( Tsung-hsin Wu ),( I-chun Tung ),( Han-chun Hsu ),( Suming Chen ),( Chao-yin Tsai ),( Yung-kun Chuang ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
Tea is one of the most consumed beverages in the world. Every tea has its own aroma and flavor characteristics due to geographic differences in environment and climate. Oolong tea, a very popular kind of partial fermentation tea in Taiwan, is generally more expensive and enjoyable. While tea leaves produced from the other countries are generally cheaper and not easily discernible, many stores mainly use cheaper tea leaves which are imported from Vietnam, India, and China, where adulteration and counterfeit may happen in tea market. To date, determination of geographical origin of tea is mainly depends on sensory evaluation, which lacks of objectivity in science. Therefore, determination of geographical origin of tea is necessary. Near infrared spectroscopy (NIRS) is a rapid and nondestructive analytical method which has become a powerful tool by associating with chemometrics for food industry. In the present study, the quality-related constituents of tea, including total polyphenols, total free amino acids, pH value, and water were evaluated by NIRS with modified partial least square regression (MPLSR). The calibration models built by MPLSR showed satisfied results. For total polyphenols, the results of the calibration model were Rc = 0.983 and SEC = 4.268 mg/g. The results of free amino acids were R<sub>c</sub> = 0.913 and SEC = 3.368 mg/g. The results of pH value were R<sub>c</sub> = 0.972 and SEC = 0.105. The results of moisture were R<sub>c</sub> = 0.969 and SEC = 0.470 %. To identify the geographical origin of tea, the qualitative method of support vector machine (SVM) will also be applied in this study. The SVM result of identify the partially fermented tea origins was achieved and the accuracies for calibration and prediction sets were both 100%. In summary, NIRS associated with chemometrics provides a useful tool for internal quality inspection and origin identification of tea.
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