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( Gwang Yeob Seo ),( Jong Soo Kim ),( Du Bok Choi ) 조선대학교 공학기술연구원 2010 공학기술논문지 Vol.3 No.3
Crude vegetable oil was isolated from waste activated bleaching earth (WABE).This oil was used for an efficient antibiotic production from Sreptomyces fradiae SF-12. Batch cueture in WABE oil medium (30 g/L) were performed for 5 days at various inoculation times. The maximum tylosin concentration, 2.1 g/l, was obtained at 36 hrs of inoculation culture. This indicates that the tylosin production of Streptomyces fradiae SF-12 was significantly increased by the inoculation time. An initial concentration of 40 g/l gave the highest tylosin concentration and lipase activity, at 2.6 g/l and 156.4 U/ml, respectively. Fed batch cultures carried out in 21 flask containing 500 ml of production medium containing WABE oil for 10 days. Tylosin production was increased with culture time. The maximum tylosin concentration was 4.2 g/l after 10 days of culture. The product yield from oil was 0.67 g/g consumed oil. In the case of viscosity, it ranged of 130.6-150.4 cP after 2days of culture. This indicates that WABE oil is the most suitable carbon source for an efficient tylosin production from Streptomyces fradiae SF-12.
서광엽(Gwang-yeob Seo),신대윤(Dae-yewn Shin) 대한환경위생공학회 2009 대한환경위생공학회지 Vol.24 No.4
We conclude the following with air pollution data measured from city measurement net administered and managed in Gwangju for the last 7 years from January in 2001 to December in 2007. In addition, some major statistics governed by Gwangju city and data administered by Gwangju as national official statistics obtained by estimating the amount of national air pollutant emission from National Institute of Environmental Research were used. The results are as follows ; 1. The distribution by main managements of air emission factory is the following ; Gwangju City Hall(67.8%) > Gwangsan District Office(13.6%) > Buk District Office(9.8%) > Seo District Office(5.5%) > Nam District Office(3.0%) > Dong District Office(0.3%) and the distribution by districts of air emission factory ; Buk District(32.8%) > Gwangsan District(22.4%) > Seo District(21.8%) > Nam District(14.9%) > Dong District(8.1%). That by types(Year 2004~2007 average) is also following ; Type 5(45.2%) > Type 4(40.7%) > Type 3(8.6%) > Type 2(3.2%) > Type 1(2.2%) and the most of them are small size of factory, Type 4 and 5. 2. The distribution by districts of the number of car registrations is the following ; Buk District(32.8%) > Gwangsan District(22.4%) > Seo District(21.8%) > Nam District(14.9%) > Dong District(8.1%) and the distribution by use of car fuel in 2001 ; Gasoline(56.3%) > Diesel(30.3%) > LPG(13.4%) > etc.(0.2%). In 2007, there was no ranking change ; Gasoline(47.8%) > Diesel(35.6%) > LPG(16.2%) > etc.(0.4%). The number of gasoline cars increased slightly, but that of diesel and LPG cars increased remarkably. 3. The distribution by items of the amount of air pollutant emission in Gwangju is the following; CO(36.7%) > NOx(32.7%) > VOC(26.7%) > SOx(2.3%) > PM-10(1.5%). The amount of CO and NOx, which are generally generated from cars, is very large percentage among them. 4. The distribution by mean of air pollutant emission(SOx, NOx, CO, VOC, PM-10) of each county for 5 years(2001~2005 ) is the following ; Buk District(31.0%) > Gwangsan District(28.2%) > Seo District(20.4%) > Nam District(12.5%) > Dong District(7.9%). The amount of air pollutant emission in Buk District, which has the most population, car registrations, and air pollutant emission businesses, was the highest. On the other hand, that of air pollutant emission in Dong District, which has the least population, car registrations, and air pollutant emission businesses, was the least. 5. The average rates of SOx for 5 years(2001~2005) in Gwangju is the following ; Non industrial combustion(59.5%) > Combustion in manufacturing industry(20.4%) > Road transportation(11.4%) > Non-road transportation(3.8%) > Waste disposal(3.7%) > Production process(1.1%). And the distribution of average amount of SOx emission of each county is shown as Gwangsan District(33.3%) > Buk District(28.0%) > Seo District(19.3%) > Nam District(10.2%) > Dong District(9.1%). 6. The distribution of the amount of NOx emission in Gwangju is shown as Road transportation(59.1%) > Non-road transportation(18.9%) > Non industrial combustion(13.3%) > Combustion in manufacturing industry(6.9%) > Waste disposal(1.6%) > Production process(0.1%). And the distribution of the amount of NOx emission from each county is the following ; Buk District(30.7%) > Gwangsan District(28.8%) > Seo District(20.5%) > Nam District(12.2%) > Dong District(7.8%). 7. The distribution of the amount of carbon monoxide emission in Gwangju is shown as Road transportation(82.0%) > Non industrial combustion(10.6%) > Non-road transportation(5.4%) > Combustion in manufacturing industry(1.7%) > Waste disposal(0.3%). And the distribution of the amount of carbon monoxide emission from each county is the following ; Buk District(33.0%) > Seo District(22.3%) > Gwangsan District(21.3%) > Nam District(14.3%) > Dong District(9.1%). 8. The distribution of the amount of Volatile Organic Compound emission in Gwangju is shown as Solvent utiliza
( Kyung Yeob Kim ),( Gwang Ha Kim ),( Tae In Ha ),( Hyoung Yoel Park ),( Sun Mi Lee ),( Tae Oh Kim ),( Dae Hwan Kang ),( Geun Am Song ) 대한소화기학회 2007 SIDDS Vol.9 No.-
Background Aims: The endoscopic grading of the gastro-esophageal flap valve (GEFV) has been suggested to be a good predictor of the reflux status. Atrophic gastritis is inversely associated with reflux esophagitis. The aim of this study was to investigate the association between GEFV, atrophic gastritis, and gastroesophageal reflux. Methods: A total of 608 patients (252 men and 356 women; mean age 51.1 years) who underwent endoscopy, esophageal manometry, and ambulatory 24-hour pH monitoring were included. GEFV was graded I through IV using Hill`s classification; the GEFV was largely classified into 2 groups: the normal GEFV group (grade I and II) and the abnormal GEFV group (grade III and IV). Atrophic gastritis was classified into 2 groups by endoscopic atrophic border; closed-type (C-type) and open-type (O-type). Findings of endoscopy, esophageal manometry, and ambulatory pH monitoring were compared among the groups. Results: The incidence of reflux esophagitis and gastro-esophageal reflux disease was associated with an abnormal GEFV grade and was inversely associated with open-type of atrophic gastritis. The patients with a coexisting abnormal GEFV and closed-type atrophic gastritis showed a significantly higher incidence of reflux esophagitis and gastroesophageal reflux disease than the patients with a coexisting normal GEFV and open-type atrophic gastritis (OR, 20.6 [95% CI, 6.2-68.4], 11.4 [95% CI, 6.3-20.7], respectively). Conclusions: Endoscopic grading of the GEFV and the atrophic gastritis is simple and provides useful information on the status of gastroesophageal reflux.
Pyridazine derived bipolar host materials for phosphorescent organic light-emitting diodes
Yu, Ji Gwang,Han, Si Hyun,Jeon, Hak Rim,Chung, Ho Kyoon,Lee, Jun Yeob Elsevier 2018 Journal of luminescence Vol.194 No.-
<P><B>Abstract</B></P> <P>Two organic materials incited by electron deficiency of a pyridazine moiety were designed for application as bipolar host materials of phosphorescent organic light-emitting diodes. Modification of the pyridazine moiety with carbazole and pyrrolocarbazole hole transport units provided 3,6-bis(2-(9<I>H</I>-carbazol-9-yl)phenyl)pyridazine (CzPd) and 3,6-bis(2-(3-phenylpyrrolo[3,2-<I>a</I>]carbazol-10(3H)-yl)phenyl)pyridazine (PCzPd) as bipolar host materials. The 3,6-bis(2-(9<I>H</I>-carbazol-9-yl)phenyl)pyridazine and 3,6-bis(2-(3-phenylpyrrolo[3,2-<I>a</I>]carbazol-10(3<I>H</I>)-yl)phenyl)pyridazine were high triplet energy hosts by ortho- substitution of the hole transport units. Based on the triplet energy of the host materials, green phosphorescent organic light-emitting diodes were devised and the green devices presented high quantum efficiency of 15.5%</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Yu, Ji Gwang,Han, Si Hyun,Lee, Ha Lim,Hong, Wan Pyo,Lee, Jun Yeob The Royal Society of Chemistry 2019 Journal of Materials Chemistry C Vol.7 No.10
<P>A novel molecular design employing a backbone structure freezing linker was developed to improve the external quantum efficiency, lifetime and emission profile of thermally activated delayed fluorescence (TADF) emitters. The backbone structure freezing linker was introduced in the TADF emitters having diphenyltriazine as an acceptor and bicarbazole, triscarbazole, and indolocarbazole as donors. A dibenzofuran moiety was the backbone structure freezing unit between the donor and acceptor units, which are positioned at the 3 and 4 positions of dibenzofuran. The dibenzofuran linker worked as a rigid freezing unit compared with the common phenyl linker, which yielded an improved efficiency, sharpened emission spectrum and extended lifetime. The dibenzofuran mediated TADF emitter exhibited a high external quantum efficiency of 23.5% and lifetimes surpassing those of the state of the art green TADF emitters. This is the first work simultaneously reporting both a high efficiency over 20% and lifetime longer than other state of the art TADF emitters.</P>
Maintenance Model of Agricultural Facilities Using CBR
Kim, Jae-Yeob,Lee, Yong-Kyu,Kim, Gwang-Hee The Korean Institute of Building Construction 2012 한국건축시공학회지 Vol.12 No.2
As we move from the industrial age to the information age, domestic industries are changing rapidly, and rural society is also laying the foundation to make use of information technologies. Through this kind of modernization, the size of agricultural facilities has been increasing on a significant scale. But, in reality, there are many difficulties in the maintenance of agricultural facilities in proportion to their growing number. Accordingly, this research aims to solve the fundamental problems that occur with agricultural facilities in the maintenance stage. In addition, it aims to provide information on how to maintain and manage facilities for farmers. The presentation of the maintenance information was conducted using a case-based reasoning method that solves current problems based on past cases. The tool of case-based reasoning was applied to define the establishment of the base for cases, characteristic variables and maintenance measures. The effectiveness of a CBR model was examined through the case study. The use of the case-based reasoning method is judged to be effective as a tool to support the decisions of farmers regarding maintenance. When the maintenance measures derived through the CBR model are offered to farmers, the fundamental problems of maintaining agricultural facilities will be solved, and the damage to such facilities minimized.