http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Hong, Seongin,Yoo, Geonwook,Kim, Dong Hak,Song, Won Geun,Le, Ong Kim,Hong, Young Ki,Takahashi, Kaito,Omkaram, Inturu,Son, Do Ngoc,Kim, Sunkook WILEY‐VCH Verlag Berlin GmbH 2017 Physica status solidi. PSS. C, Current topics in s Vol.14 No.3
<P>Seongin Hong et al. (article no. <url href='http://doi.wiley.com/10.1002/pssc.201600262'>1600262</url>) have investigated the polyethylenimine (PEI) doping mechanism and its effect on the electrical and optical properties of multilayer MoS<SUB>2</SUB> field effect transistors (FETs). Density functional theory (DFT) calculation and X‐ray photoelectron spectroscopy (XPS) measurement confirm that the PEI molecules were successfully doped and formed Mo–N bonds on the MoS<SUB>2</SUB> channel, generating new energy states near the valence band. The strong n‐doping changed the threshold voltage as well as the Schottky barrier width attributed to the induced interfacial dipoles. Therefore, the ON‐current of the doped MoS<SUB>2</SUB> FETs was improved in comparison with the pristine FETs. Furthermore, the PEI doping also enhanced the photoresponsivity of the MoS<SUB>2</SUB> FETs from 0.14 A/W to 4.41 A/W. This study suggests that PEI molecular doping could be widely applicable to two‐dimensional materials in order to improve the electrical and optical properties of respective devices.</P>
Immunomodulatory functional foods and their molecular mechanisms
Kim Jae Hwan,Kim Da Hyun,Jo Seongin,Cho Min Je,Cho Ye Ryeong,Lee Yong Joon,Byun Sanguine 생화학분자생물학회 2022 Experimental and molecular medicine Vol.54 No.-
The immune system comprises a complex group of processes that provide defense against diverse pathogens. These defenses can be divided into innate and adaptive immunity, in which specific immune components converge to limit infections. In addition to genetic factors, aging, lifestyle, and environmental factors can influence immune function, potentially affecting the susceptibility of the host to disease-causing agents. Chemical compounds in certain foods have been shown to regulate signal transduction and cell phenotypes, ultimately impacting pathophysiology. Research has shown that the consumption of specific functional foods can stimulate the activity of immune cells, providing protection against cancer, viruses, and bacteria. Here, we review a number of functional foods reported to strengthen immunity, including ginseng, mushrooms, chlorella, and probiotics (Lactobacillus plantarum). We also discuss the molecular mechanisms involved in regulating the activity of various types of immune cells. Identifying immune-enhancing functional foods and understanding their mechanisms of action will support new approaches to maintain proper health and combat immunological diseases.
Assessment of flow-accelerated corrosion-induced wall thinning in SA106 pipes with elbow sections
Seongin Moon,Jong Yeon Lee,Kyung-Mo Kim,Soon-Woo Han,Gyeong-Geun Lee,Wan-Young Maeng,Sebeom Oh,Dong-Jin Kim Korean Nuclear Society 2024 Nuclear Engineering and Technology Vol.56 No.4
A combination of flow-accelerated corrosion (FAC) tests and corresponding computational fluid dynamics (CFD) tests were performed to determine the hydrodynamic parameters that could help predict the highly susceptible location to FAC in the elbow section. The accelerated FAC tests were performed on a specimen containing elbow sections fabricated using commercial 2-inch carbon steel pipe. The tests were conducted at flow rates of 9 m/s under the following conditions: water temperature of 150 ℃, dissolved oxygen <5 ppb, and pH 7. Thickness reduction of the specimen pipe due to FAC was measured using ultrasonic testing. CFD was conducted on the FAC test specimen, and the turbulence intensity, and shear stress were analyzed. Notably, the location of the maximum hydrodynamic parameters, that is, the wall shear stress and turbulent intensity, is also the same location with maximum FAC rate. Therefore, the shear stress and turbulence intensity can be used as hydrodynamic parameters that help predict the FAC-induced wall-thinning rate. The results provide a method to identify locations susceptible to FAC and can be useful for determining inspection priority in piping systems.
Kim, Munsung,Moon, Seongin,Kang, To,Kim, Kyongmo,Song, Sung-Jin,Suh, Myungwon,Suhr, Jonghwan Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.6
Ultrasonic nondestructive testing is important for monitoring the structural integrity of dissimilar metal welds (DMWs) in pressure vessels and piping in nuclear power plants. However, there is a low probability of crack detection via inspection of DMWs using ultrasonic waves because the grain structures (grain orientations) of the weld area cause distortion and splitting of ultrasonic beams propagating in anisotropic media. To overcome this issue, the grain orientation should be known, and a precise ultrasonic wave simulation technique in anisotropic media is required to model the distortion and splitting of the waves accurately. In this study, a method for nondestructive prediction of the DMW grain orientations is presented for accurate simulation of ultrasonic wave propagation behavior in the weld area. The ultrasonic wave propagation behavior in anisotropic media is simulated via finite-element analysis when ultrasonic waves propagate in a transversely isotropic material. In addition, a methodology to predict the DMW grain orientation is proposed that employs a simulation technique for ultrasonic wave propagation behavior calculation and an optimization technique. The simulated ultrasonic wave behaviors with the grain orientations predicted via the proposed method demonstrate its usefulness. Moreover, the method can be used to determine the focal law in DMWs.
Multilayer Perceptron Model to Estimate Solar Radiation with a Solar Module
Kim, Joonyong,Rhee, Joongyong,Yang, Seunghwan,Lee, Chungu,Cho, Seongin,Kim, Youngjoo Korean Society for Agricultural Machinery 2018 바이오시스템공학 Vol.43 No.4
Purpose: The objective of this study was to develop a multilayer perceptron (MLP) model to estimate solar radiation using a solar module. Methods: Data for the short-circuit current of a solar module and other environmental parameters were collected for a year. For MLP learning, 14,400 combinations of input variables, learning rates, activation functions, numbers of layers, and numbers of neurons were trained. The best MLP model employed the batch backpropagation algorithm with all input variables and two hidden layers. Results: The root-mean-squared error (RMSE) of each learning cycle and its average over three repetitions were calculated. The average RMSE of the best artificial neural network model was $48.13W{\cdot}m^{-2}$. This result was better than that obtained for the regression model, for which the RMSE was $66.67W{\cdot}m^{-2}$. Conclusions: It is possible to utilize a solar module as a power source and a sensor to measure solar radiation for an agricultural sensor node.
Multilayer Perceptron Model to Estimate Solar Radiation with a Solar Module
( Joonyong Kim ),( Joongyong Rhee ),( Seunghwan Yang ),( Chungu Lee ),( Seongin Cho ),( Youngjoo Kim ) 한국농업기계학회 2018 바이오시스템공학 Vol.43 No.4
Purpose: The objective of this study was to develop a multilayer perceptron (MLP) model to estimate solar radiation using a solar module. Methods: Data for the short-circuit current of a solar module and other environmental parameters were collected for a year. For MLP learning, 14,400 combinations of input variables, learning rates, activation functions, numbers of layers, and numbers of neurons were trained. The best MLP model employed the batch backpropagation algorithm with all input variables and two hidden layers. Results: The root-mean-squared error (RMSE) of each learning cycle and its average over three repetitions were calculated. The average RMSE of the best artificial neural network model was 48.13 W·m-2. This result was better than that obtained for the regression model, for which the RMSE was 66.67 W·m-2. Conclusions: It is possible to utilize a solar module as a power source and a sensor to measure solar radiation for an agricultural sensor node.