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Choi, Wonsuk,Hamidoghli, Ali,Bae, Jinho,Won, Seonghun,Choi, Youn Hee,Kim, Kang-Woong,Lee, Bong-Joo,Hur, Sang-Woo,Han, Hyonsob,Bai, Sungchul C. The Korean Society of Fisheries and Aquatic Scienc 2020 Fisheries and Aquatic Sciences Vol.23 No.8
Background: High demand and low supply of fishmeal due to overexploitation of fisheries resources have resulted in a dramatic increase in the price of this ingredient. Olive flounder (Paralichthys olivaceus) commercial feed contains approximately 60% fishmeal and limited success has been achieved in identifying sustainable alternative protein sources for this species. Methods: An on-farm feeding trial was conducted to compare a basal diet containing 65% as the control (CONT) with two experimental diets replacing 10% of fishmeal by animal protein (AP<sub>10</sub>) or 20% of fishmeal by animal and plant protein (APP<sub>20</sub>). Sub-adult olive flounder averaging 327 ± 9.3 g (mean±SD) were fed one of the three diets in triplicate groups for 16 weeks. Results: Weight gain, specific growth rate, feed efficiency, protein efficiency ratio, and survival were not significantly different among fish fed all the experimental diets (P > 0.05). Also, non-specific immune responses (superoxide dismutase and lysozyme activity), serum biochemical parameters, and intestinal villi length were not significantly different among fish fed all the experimental diets (P > 0.05). Conclusions: Therefore, based on growth performance, non-specific immune responses, serum biochemical parameters, and intestinal histology, dietary animal and plant protein mixtures could replace up to 20% of fishmeal in the diet of sub-adult olive flounder.
Sungchul Choi,백성훈,박승규,박낙규,김덕현 한국광학회 2012 Current Optics and Photonics Vol.16 No.4
Differential absorption LIDAR (DIAL) is frequently used for atmospheric gas monitoring to detect impurities such as nitrogen dioxide, sulfur dioxide, iodine, and ozone. However, large differences in the on- and off-line laser wavelengths can cause serious errors owing to differential aerosol scattering. To resolve this problem, we have developed a new DIAL system for iodine vapor measurements in particular. The suggested DIAL system uses only one laser under seeded and unseeded conditions. To check the detection-sensitivity and error effects, we compared the results from a system using two seeded lasers with those from a system using a seeded and an unseeded laser. We demonstrate that the iodine concentration sensitivity of our system is improved in comparison to the conventional two seeded or two unseeded laser combinations.
The Measurement of the LIDAR Ratio by Using the Rotational Raman LIDAR
Sungchul Choi,백성훈,Seungkyu Park,Hyungki Cha,Imkang Song,김덕현 한국광학회 2010 Current Optics and Photonics Vol.14 No.3
The rotational Raman LIDAR technique has been used to accurately measure aerosol optical properties such as backscatter coefficient, extinction coefficient, and LIDAR ratio. In the case of the vibrational Raman technique, the Ångström exponent, which has wavelength dependence on the particle properties, is assumed to obtain the extinction coefficient. However, this assumed Ångström exponent can cause systematic errors in retrieving aerosol optical properties. In the case of the rotational Raman technique, the aerosol optical properties can be measured without any assumptions about the Ångström exponent. In this paper, the LIDAR ratio was measured by using the rotational Raman LIDAR and vibrational Raman LIDAR in the troposphere. And, the LIDAR ratios measured by these two methods were compared.
Study of digital process for custom design
Sungchul Choi 한국디자인지식학회 2007 한국디자인지식학회 Conference Vol.2007 No.8
Design has been changed continuously in order of Mass Production, Customization, Personalization and Individualization. There starts a change in custom design field with idea of digital to satisfy individual diverse taste and desire as following this tendency of change. Custom design does not start its process till collect a personal taste, desire and physical data and analyze all these. For this reason, custom design process starts inversely with ordinary design. Also it is concerned a lot for providing a sole product to customer and enterprise wants to use this as an aggressive marketing method. With an overall development of software, hardware and producing system, custom design is needed to possess a process to manage it with effect. This study suggests an efficient process that applicable to custom design with analysis of reverse engineering precess, design process and digital process.
Study of digital process for custom design
Sungchul Choi (사)한국디지털디자인협의회 2007 (사)한국디지털디자인협의회 conference Vol.2007 No.1
Design has been changed continuously in order of Mass Production, Customization, Personalization and Individualization. There starts a change in custom design field with idea of digital to satisfy individual diverse taste and desire as following this tendency of change. Custom design does not start its process till collect a personal taste, desire and physical data and analyze all these. For this reason, custom design process starts inversely with ordinary design. Also it is concerned a lot for providing a sole product to customer and enterprise wants to use this as an aggressive marketing method. With an overall development of software, hardware and producing system, custom design is needed to possess a process to manage it with effect. This study suggests an efficient process that applicable to custom design with analysis of reverse engineering precess, design process and digital process.
Sungchul Choi,Beom Kyung Kim,Dong Keon Yon,Seung Won Lee,Han Gyeol Lee,Ho Hyeok Chang,Seoyeon Park,Ai Koyanagi,Louis Jacob,Elena Dragioti,Joaquim Radua,Jae Il Shin,Seung Up Kim,Lee Smith 대한간학회 2023 Clinical and Molecular Hepatology(대한간학회지) Vol.29 No.2
Background/Aims: Global distribution of dominant liver cancer aetiologies has significantly changed over the past decades. This study analyzed the updated temporal trends of liver cancer aetiologies and sociodemographic status in 204 countries and territories from 1990 to 2019. Methods: The Global Burden of Disease 2019 report was used for statistical analysis. In addition, we performed stratification analysis to five quintiles using sociodemographic index and 21 geographic regions. Results: The crude numbers of liver cancer disease-adjusted life years (DALYs) and deaths significantly increased during the study period (DALYs; 11,278,630 in 1990 and 12,528,422 in 2019, deaths; 365,215 in 1990 and 484,577 in 2019). However, the Age-standardized DALY and mortality rates decreased. Hepatitis B virus (HBV) remains the leading cause of liver cancer DALYs and mortality, followed by hepatitis C virus (HCV), alcohol consumption, and non-alcoholic steatohepatitis/non-alcoholic fatty liver disease (NASH/NAFLD). Although Age-standardized DALY and mortality rates of liver cancer due to HBV and HCV have decreased, the rates due to alcohol consumption and NASH/NAFLD have increased. In 2019, the population of the East Asia region had the highest Age-standardized DALY and mortality rates, followed by high-income Asia-Pacific and Central Asia populations. Although East Asia and high-income Asia-Pacific regions showed a decrease during the study period, Age-standardized DALY rates increased in Central Asia. High-income North American and Australasian populations also showed a significant increase in Age-standardized DALY. Conclusions: Liver cancer remains an ongoing global threat. The burden of liver cancer associated with alcohol consumption and NASH/NAFLD is markedly increasing and projected to continuously increase.