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Xiaoyue Sang,Zhaohui Yuan,Xiaojun Yu,Muhammad Tariq Sadiq,Na Liang,Noman Naseer,GaoXi Xiao 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.7
The surface temperature of workpieces in a multi-temperature zone sintering furnace is an important parameter to characterize the performances of a multi-temperature zone system. Due to the practical structural properties of the sintering furnace, however, the conventional way of temperature measurement cannot detect the exact surface temperature of the workpieces directly, making it difficult to control the multi-temperature zone system performances precisely. To address such an issue, this paper proposes, for the first time to the best of our knowledge, a temperature compensation algorithm based soft-measurement technique to compensate for the temperature of the measuring points. Specifically, we analyze the heat-transfer mechanism within the electric heating surface and the workpiece surface and establish a mathematical model for it first, and then calculate the radiative heat transfer coefficient between the diffuse gray surface within sintering furnace using the discrete radiation heat transfer method. Finally, the heat transfer mechanism based soft measurement technique is proposed and applied tocompensate for the temperature. Both simulations and experiments with a practical sintering furnace are conducted to verify the correctness and effectiveness of the proposed temperature compensation algorithm in different cases. Results show that the proposed algorithm could help maintain the temperature difference within a range limit of ±5◦, which is much better as compared with the conventional temperature measurement methods.
Xiaoyu SHI,Hyeon Min PARK,Myeong-Eun LEE,Sung Ok HAN 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10
Isopropanol is converted industrially to propylene, which is important not only as a fuel but also as a backbone chemical for bioplastics. One of high stress tolerant yeasts, Yarrowia lipolytica is an oleaginous strain possessing relatively high native acetyl-CoA levels. Here, we genetically engineered a Y. lipolytica strain, which is expected to increase the yield of isopropanol. Malonyl-CoA is a major substrate exhibiting a high synthesis rate and high concentration in a lipid metabolic pathway. When the acetoacetyl-CoA synthase gene (nphT7) synthesizing acetoacetyl-CoA from malonyl-CoA and acetyl-CoA is used, isopropanol productivity can be expected to increase the yield of isopropanol. This experiment showed that 300 ㎎/L of isopropanol was produced under the shaking flasks cultivation condition, representing two-fold increase in isopropanol titer compared to previous studies. Taken together, this is the first report of the isopropanol production by using lipid metabolic pathway in Y. lipolytica.
( Xiaoyu Lin ),( Duy Tho Tran ),( Myung-hee Song ),( Yeoung-sang Yun ) 한국폐기물자원순환학회 2022 ISSE 초록집 Vol.2022 No.-
It is important to separate and recover valuable metals from waste electrical and electronic equipments (WEEEs). Here, a new strategy for leaching-adsorption sequential leaching-recovery of copper, silver, and gold from WEEEs was presented. Firstly, a leaching efficiency of 99.9% copper was achieved using a mixture of sulfuric acid (0.45%) and hydrogen peroxide (5%). Subsequently, chitosan fibers (CFs) were prepared and used for the recovery of Cu(II), showing that its adsorption efficiency was 97.85 ± 0.02% within 30 min. The Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) analyses revealed that the adsorption mechanism is likely a coordination bond between Cu(II) and amino groups of CFs. During the copper recovery process, sulfate (SO<sub>4</sub><sup>2-</sup>) in the leachate was also removed by CFs with an efficiency of 98.79 ± 1.67%, which was via an electrostatic attraction. Next, silver was leached with a nitric acid solution, and then silver chloride was recovered using sodium chloride. The leaching and recovery of Ag were approximately 100%. Finally, gold was leached with cyanide as low as 50 ppm at pH around 10.5, resulting in its leaching efficiency of 90.75 ± 3.45%. The leached gold was recovered with 96.21 ± 2.96% efficiency by quaternary amino-functionalized chitosan fibers (QCFs) within 5 mins. Gold species in the leachate was confirmed to be gold cyanide anions (Au(CN)<sub>2</sub><sup>-</sup>). The XPS analysis indicated that the electrostatic attraction between quaternary amine groups in QCFs and Au(CN)<sub>2</sub><sup>-</sup> play a major role in gold adsorption . Metallic gold with a purity of 97.4% was obtained by incineration of gold-loaded QCFs.
Hand Command Synthesis Based on Hand Gesture Recognition
He XiaoYu,Li-Wei,Sang-Yun Park,Jeong Goo Kim,Sung-Jin Kim,Eung-Joo Lee 한국멀티미디어학회 2007 한국멀티미디어학회 국제학술대회 Vol.2007 No.-
In this paper, we utilize hand gesture information to recognize hand gesture. Firstly, we can utilize human skin color information in YCbCr color model to detect human skin region, and then use edge detection algorithm to detect skin region edge, and confirm the rotundity rate constant for every region by comparing region length to area value. Because that for human hand, it contain very complex edge, so hand's rotundity rate is usually very large. Through this method we can easily confirm hand region and remove those small parts which we call it noise parts. Then we segment the hand region into 5 by 5 pieces and calculate pixel rate of every region to extract eigenvector of hand. We employed a recognition machine based on neural net to recognize the detected hand posture. For recognized hand posture, we then code it to make a corresponding command for synthesizing a sound. And for hand gesture, we can divide the input video into several frames, and in every frame, we can applied the hand posture recognition to recognize the information.
Hand Gesture Recognition Using Neural Network
He XiaoYu,Sang-Yoon Park(박상윤),Jung-Hoon Kim(김정훈),Young-Il Kim(김영일),Chang-Min Seo(서창민),Eung-Joo Lee(이응주) 한국멀티미디어학회 2007 한국멀티미디어학회 학술발표논문집 Vol.2007 No.1
In this paper, we present an algorithm which detects human hand by skin color information in YCbCr and HIS color model. And for confirming special human hand we use circle rate of region to detect hand region because human hand have complex edge than other region, thus circle rate of hand region is usually more greater. For the recognition of detected hand, we segmented it into 5 by 5 paces and calculate the pixel rate of every piece to extract eigenvector of hand region. And we employed a recognition method based on neural network algorithm to recognize the hand gestures. The experimental results show that an algorithm plays an efficient effort for hand gesture recognition.
Hand Posture Recognition Based on PCA
He XiaoYu,Sang-Yoon Park,Jung-Hoon Kim,Young-Il Kim,Chang-Min Seo,Eung-Joo Lee 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
In this paper, we present an algorithm which detects human hand by skin color information in YCbCr and HIS color model. And for confirming special human hand we use circle rate of region to detect hand region because human hand have complex edge than other region, thus circle rate of hand region is usually more greater. For the recognition of detected hand, we use the Hausdorff to tracking the hand region. And we employed a recognition method based on PCA algorithm to recognize the hand gestures. The experimental results show that an algorithm plays an efficient effort for hand gesture recognition.
Production of Biodiesel in Yarrowia lipolytica by Truncation of Wax Ester Synthase
Hyeon-Min PARK,Xiaoyu SHI,Myeong-Eun LEE,Sung Ok HAN 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10
Research about the production of biofuels has been carried out world widely because of many environmental issues and economic competitiveness. Among biofuels, biodiesel established one of successful examples, which produce fatty acid methyl/ethyl esters (FAMEs/FAEEs) by wax ester synthase from Marinobacter hydrocarbonoclasticus (MhWS). In this study, we enhanced production of FAEEs in Yarrowia lipolytica by abolishing the DUF 1298 motif of MhWS. This resulted in 152.3 ㎎/L of extracellular FAEEs. To secure enough cell growth, ethanol was inducted in the late exponential phase and the amount of extracellular FAEEs increased to 757.64 ㎎/L. Also, further integration of biotin carboxylase gene improved the production of FAEEs, which produced 849.81 ㎎/L. Furthermore, the addition of LiOAC caused the increase of secretion, which resulted in 940.40 ㎎/L of extracellular FAEEs. Finally, we optimized culture system to get more cell growth and glucose uptake. As a result, total production of FAEEs reached to 2.37 g/L at 120h. This study can show progression to the production of biodiesels, which can offer another strategy to construct culture system.