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_c = 0.913 and SEC = 3.368 mg/g. The results of pH value were R_c = 0.972 and SEC = 0.105. The results of moisture were R_c = 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.

Where Are Landscape Designers' Spatial Abilities in the Brain? An fMRI Study

Shih-Han Hung,Chia-Yi Huang,Tsung-Ren Huang,Shih-An Tang,Yu-Ping Tsai,Chun-YenChang 인간식물환경학회 2023 인간식물환경학회지 Vol.26 No.5

Background and objective: To effectively understand and communicate their work, landscape designers should possessexcellent spatial abilities. Neurological methods have confirmed that activation of the occipital lobe, parietal cortex, andprefrontal cortex affect the judgment of space; however, few studies have measured spatial abilities in landscape design. This study aimed to identify the potential role of various brain regions during spatial interpretation processes by landscapedesigners, particularly the effect of stimulating the frontal lobe on enhancing design capabilities. Methods: This study tested the spatial abilities of landscape designers when transforming a planar drawing into a sectionaldrawing and the brain regions activated in this process. The subjects were asked to identify the correct option whenmatching given section lines in a planar drawing. The correct answer rate and response time were used to score brainactivation during spatial task processes. A total of 16 valid subjects were divided into high- and low-accuracy groupsaccording to the correct answer rate. Results: The results for the high-accuracy group showed that the left inferior frontal gyrus was activated during spatialdesign tasks. In contrast, the findings for the low-accuracy group revealed that the left middle occipital gyrus was activatedfor processing visual information. Conclusion: The findings suggest that the frontal lobe plays a role in allowing landscape designers to make planar tocross-sectional inferences via mental rotations and categorical spatial relations. The findings offer implications forlandscape designers in stimulating the frontal lobe and enhancing their design capabilities.

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 B₁ (AFB₁), 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 AFB₁ content in rice. In the present study, evaluation of AFB₁ contaminated rice were conducted by using near infrared spectroscopy (NIRS) technique with chemometrics. NIR Spectra and the AFB₁ 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 AFB₁ content in rice.

Integration of Independent Component Analysis with Near Infrared Spectroscopy for Evaluation of Tea Quality

( 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.

The Association between Default-mode Network Functional Connectivity and Childhood Trauma on the Symptom Load in Male Adults with Methamphetamine Use Disorder

Shyh-Yuh Wei,Tsung-Han Tsai,Tsung-Yu Tsai,Po See Chen,Huai-Hsuan Tseng,Yen Kuang Yang,Tianye Zhai,Yihong Yang,Tzu-Yun Wang 대한정신약물학회 2024 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.22 No.1

Objective: The relationship between adverse childhood experiences and methamphetamine use disorder (MUD) has been shown in previous studies; nevertheless, the underlying neural mechanisms remain elusive. Childhood trauma is associated with aberrant functional connectivity (FC) within the default-mode network (DMN). Furthermore, within the DMN, FC may contribute to impaired self-awareness in addiction, while cross-network FC is critical for relapse. We aimed to investigate whether childhood trauma was associated with DMN-related resting-state FC among healthy controls and patients with MUD and to examine whether DMN-related FC affected the effect of childhood trauma on the symptom load of MUD diagnosis. Methods: Twenty-seven male patients with MUD and 27 male healthy controls were enrolled and completed the Childhood Trauma Questionnaire. DMN-related resting-state FC was examined using functional magnetic resonance imaging. Results: There were 47.1% healthy controls and 66.7% MUD patients in this study with adverse childhood experiences. Negative correlations between adverse childhood experiences and within-DMN FC were observed in both healthy controls and MUD patients, while within-DMN FC was significantly altered in MUD patients. The detrimental effects of adverse childhood experiences on MUD patients may be attenuated through DMN-executive control networks (ECN) FC. Conclusion: Adverse childhood experiences were negatively associated with within-DMN FC in MUD patients and healthy controls. However, DMN-ECN FC may attenuate the effects of childhood trauma on symptoms load of MUD.

Establishment of the Model Widely Valid for the Melting and Vaporization Zones in Selective Laser Melting Printings Via Experimental Verifications

Chang-Shuo Chang,Kuan-Ta Wu,Chang-Fu Han,Tsung-Wen Tsai,Sung-Ho Liu,Jen-Fin Lin 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.9 No.1

The thermally affected material properties operating in the three phases and porosity variations in the SS316L steel powder have been introduced to the numerical analyses for the transient volumetric heat source (Q) models developed for the solid powder, melting, and vaporization regions in the selective laser melting (SLM). The bulk Q is thus a function of these heat sources and their ratio defined for the liquid and vapor phases. The heat conduction developed for the solid powders with porosity strings the heat convection with Q as the moving heat source to solve two-dimensional temperature distributions efficiently without the confinement of operating conditions and phase presumption. The specimens with single- and multiple-track printings are prepared to investigate the effects of incident energy density (E) and power intensity (I o) on the geometries of single-track printings and the areal surface roughness (Sa) values of the multiple-track printings with 0 and 50% overlap ratios. Laser power and scanning velocity are the controlling factors for the melting pool depth D and width W . D and W become the governing factors for the keyhole with evaporations, which affects the height H of single track after solidification. The W and D results predicted by the theoretical models developed in this study have an error range, 5–20%, compared to the experimental ones, which is much lower than those reported in the literatures (Gusarov et al. in J Heat Transf 131(7):072101, 2009. https ://doi.org/10.1115/1.31092 45 ; Hussein et al. in Mater Des 52:638–647, 2013. https ://doi.org/10.1016/j.matde s.2013.05.070 ; Yin et al. Int J Adv Manuf Technol 83(9–12): 1847–1859, 2016. https ://doi.org/10.1007/s0017 0-015-7609-x ; Andreotta et al. in Finite Elem Anal Des 135: 36–43, 2017. https ://doi.org/10.1016/j.finel .2017.07.002 ). The contact angle ( ϕ * ) is defined as a function of single-track width ( W ) and solidification height ( H ). ϕ * and Sa are significantly reduced as an E is applied beyond its critical value (47.62–57.14 J/mm 3 ). Significant change in Sa is ascribed to the big difference in the morphology and its surface pattern when E or I o reaches its critical value.

Dynamics and Transport in Polymer Membrane

Bradley R. Frieberg,Jacob D. Tarver,Cheol Jeong,Madhusudan Tyagi,Edwin P. Chan,Christopher M. Stafford,Tsung-Han Tsai,WenXu Zhang,Bryan Coughlin,Christopher L. Soles 한국고분자학회 2016 한국고분자학회 학술대회 연구논문 초록집 Vol.41 No.2