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Indolyl Alkaloid Derivatives, Nb-Acetyltryptamine and Oxaline from a Marine-Derived Fungus
YongLi,XiFengLi,DongSooKim,HongDaeChoi,ByengWhaSon 대한약학회 2003 Archives of Pharmacal Research Vol.26 No.1
Indolyl alkaloids, Nb-acetyltryptamine (1) and the known oxaline (2) have been isolated from the organic extract of the broth of an unidentified fungus collected from the surface of the marine red alga Gracilaria verrucosa. The structure of Nb-acetyltryptamine (1) was assigned on the basis of comprehensive spectroscopic analyses.
Effects of Hf Incorporation on Indium Zinc Oxide Thin-Film Transistors using Solution Process
Xifeng Li,Enlong Xin,Jianhua Zhang 대한금속·재료학회 2015 ELECTRONIC MATERIALS LETTERS Vol.11 No.1
Thin-film transistors (TFTs) were fabricated by employing amorphoushafnium indium zinc oxide (HIZO) thin films as the active channellayer by the solution process. Thermogravimetry-differential thermalanalysis, transmittance measurements, atomic force microscopy,scanning electron microscopy, x-ray diffraction, and Fourier transforminfrared analysis were used to study the formation, structure, andoptical properties of the HIZO films. The results showed that theaddition of Hf to the IZO system resulted in suppression of carriergeneration. The HIZO TFTs exhibited lower off-currents and higher onoffcurrent ratios than IZO TFTs without Hf doping. HIZO TFTs with aHf doping content of 5 at. % obtained a threshold voltage of 3.7 V, amobility of 0.27 cm2 V−1 s−1, a subthreshold swing of 1.2 V/dec, and anon-off current ratio of 106.
Recognition Algorithm and Optimization Experiments on Tomato Picking Robots
Xifeng Liang,Zhengshuai Jiang,Binrui Wang 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.9
In order to improve the recognition accuracy of vision system on tomato picking robots, the paper proposed a method of feature extraction and recognition for ripe tomato based on illumination irrelevant images and support vector machine (SVM). In this method, we adopted vector median filter (VMF) to process the tomato images to eliminate noise and make the images more smooth firstly. To avoid the effects of natural environment illumination to the vision system, we processed tomato images and obtained the tomato illumination irrelevant images according to color constancy algorithm of the single pixel. Secondly, we segmented illumination irrelevant images using OSTU method, separated multiple objects by a watershed algorithm based on distance transform and got the target area with mathematical morphology. Also we extracted color, shape and textural features of the ripe tomatoes. Finally, we did experiments on recognizing tomatoes using support vector machine (SVM) with different kernel functions. At the same time, in order to obtain optimal model of SVM, we adopted cross validation and grid search method to optimize the model parameters. The experiment results show that illumination irrelevant processing not only can eliminate the influence of light intensity, but save a gray transferring step for further image segmentation. SVM with radial basis function is better than other kernel functions SVM and the tomato recognition accuracy is 95.7%. Through optimizing the parameter C and r of radial basis function, the tomato recognition accuracy reaches up to 96.9% with the increase of 1.2% when C and r is 4 and 16 respectively. This proves that it's feasible and effective to optimize SVM's parameters by cross validation and grid search method, which provide foundation for further research on vision system of tomato picking robots.
방송 매체에 나타난 한국어의 맞장구 표현과 중국어의 부화어 사용 양상 연구
QUAN XIFENG,김주흠 국제한국어교육학회 2023 한국어 교육 Vol.34 No.4
The purpose of this study is to establish foundational data for enhancing the communication skills of Chinese learners of Korean by examining the patterns of ‘Korean Backchannel’ and ‘Chinese Backchannel’ in daily conversations. This study analyzed conversations in variety shows and examined the expressions of listeners’ responses in the dialogue. In addition, we compared them in terms of function, shape, frequency, and position, identifying both similarities and differences. Furthermore, we discussed the educational implications for improving the communication skills of Chinese learners of Korean. The results of the analysis revealed that within a similar timeframe, the frequency of using ‘Korean Backchannel’ is higher than ‘Chinese Backchannel’. Moreover, many similarities and differences were also found in the parts of word class, honorification and language form. Finally, the comparison of appearance positions showed that although the ‘Korean Backchannel’ often appeared in the middle of the dialogue, but most of the ‘Chinese Backchannel’ appeared at the end. The results of this study are expected to contribute to the development of effective teaching methods for ‘Korean Backchannel’ education for Chinese learners of Korean.