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Kim, Seog Ju,Cho, Seong-Jin,Jang, Ha Min,Shin, Jonghan,Park, Pil-Whan,Lee, Yu Jin,Cho, In Hee,Choi, Jung-Eun,Lee, Heon-Jeong S. Karger AG 2009 Neuropsychobiology Vol.61 No.1
<P>There have been controversial results regarding the association between brain-derived neurotrophic factor (BDNF) Val66Met polymorphism and anxiety-related traits such as harm avoidance (HA). We aimed to investigate the interaction between <I>BDNF</I> Val66Met polymorphism and negative life stressors in HA. <I>BDNF</I> Val66Met polymorphism was genotyped in 391 community-dwelling Koreans (152 males, 239 females; 43.2 ± 14.1 years old). The Temperament and Character Inventory (TCI) and the Center for Epidemiological Studies for Depression Scale (CES-D) were self applied. The Structured Clinical Interview for DSM-IV axis I disorders and face-to-face interviews investigating negative life stressors within the last 6 months were also performed. There was no significant difference in TCI score, major depressive disorder prevalence and CES-D score among the 3 genotypes (94 Met/Met, 188 Val/Met and 109 Val/Val subjects). There was no significant difference in TCI scores between subjects with stressors and those without stressors, while more common major depressive episodes (p = 0.03) and higher CES-D scores (p < 0.001) were found in subjects with stressors. However, there was a significant interaction between the <I>BDNF</I> genotype and negative life stressors in HA (p = 0.02). Only subjects with the Val/Val genotype showed higher HA with recent negative stressors. Our finding suggests that <I>BDNF</I> Val66Met polymorphism might influence HA by interacting with recent negative stress experience.</P><P>Copyright © 2009 S. Karger AG, Basel</P>
Simulation of CO<sub>2</sub> enrichment and climate change impacts on soybean production**
Fu, Tongcheng,Ha, Bokeun,Ko, Jonghan De Gruyter Open 2016 International agrophysics Vol.30 No.1
<P><B>Abstract</B></P><P>The potential doubling of atmospheric CO<SUB>2</SUB>concentration and associated changes in temperature and precipitation are crucial issues for agricultural productivity. The CROPGRO-Soybean model in decision support system for agro-technology transfer v4.5 to simulate soybean (<I>Glycine</I>max cv. Pioneer 93B15) grown in an elevated CO<SUB>2</SUB>environment was calibrated and validated. Crop growth and yield data were obtained from a series of experiments conducted in central Illinois at the soybean free air CO<SUB>2</SUB>enrichment facility from 2002 to 2006. The model was applied to simulate the possible impacts of climate change on soybean yield in the region for the future years of 2080-2100, centred on 2090. The model reproduced the measured soybean growth and yield well under ambient and elevated CO<SUB>2</SUB>conditions. For the period from 2081 to 2100, soybean yield was projected to decrease due to elevated temperature but to increase due to elevated precipitation and CO<SUB>2</SUB>concentration, achieving counterbalance. The adverse impacts of the warming conditions on soybean yield can be mitigated by late planting within an optimum planting range (day of year 145 to 152) as a management option, as well as by controlling genetic responses to thermal days in the reproductive stage.</P>
Biochemical Responses of Soybean (Glycine max L. Merr.) to Proton Beam Irradiation
( Juhyun Im ),( Jonghan Ko ),( Han-yong Kim ),( Bo-keun Ha ) 한국육종학회 2017 Plant Breeding and Biotechnology Vol.5 No.2
The present study evaluated the biochemical effects of proton beam irradiation in soybean. Seeds of two Korean elite cultivars (Kwangan and Pungsannamul) were irradiated by a 57-MeV proton beam in the range of 50-400 Gy. We measured the contents of malondialdehyde (MDA), antioxidant enzymes, and chlorophyll. MDA contents in proton beam-irradiated plants were higher than those in control plants. The activity of antioxidant enzymes differed between the two cultivars. In Kwangan, ascorbate peroxidase (APX) activity increased by 29% relative to the control at 55 Gy and decreased by 58% at 308 Gy. Superoxide dismutase (SOD) and peroxidase (POD) activities decreased by 47 and 25% relative to the control at 55 Gy and recovered to 87 and 56% of that at 55 Gy with 172 Gy and 117 Gy, respectively. In Pungsannamul, APX and SOD decreased by 32 and 35% relative to the control at 62 Gy, with the highest value observed at 243 Gy. In terms of the chlorophyll content, the two varieties responded similarly to proton beam irradiation, whereas in Kwangan, no significant reduction was observed above 100 Gy when compared with the control. Proton beam irradiation affected chlorophyll b more than chlorophyll a. These results show that the activity of antioxidant enzymes decreased in response to irradiation with approximately 50 Gy proton beams, then increased gradually with increasing doses, followed by a moderate decrease at higher doses. According to correlation with MDA contents and antioxidant enzyme activities, defense system of Pungsannamul was less activated by proton-beam irradiation than that of Kwangan.
박영남,박종한,정철호,하재창,고효진 大韓神經精神醫學會 1991 신경정신의학 Vol.30 No.6
Prevalence of dementia was studied in a group aged 65 or more in a Myun area of Yungil, County Kyungpook Province. The DSM-III-R criterion was employed in diagnosis of dementia. Important findings are summarized as follows : 1) Prevalence rates were 11.3% in all the elderly of both sexes, 7.2% in males, and 15.4% in females. Significant sex difference of prevalence was observed after mid-seventy. 2) Prevalence rate of dementia increased with increasing age in both sexes. 3) Critical age seems to exist in the development of dementia, and the age may be earlier in females than in males. 4) The number of the elderly with mild dementia was largest, and that of the elderly with severe dementia smallest.
Effects of oxidized biodiesel on formation of particulate matter and NOx from diesel engine
Byung-Ki Na,Hyungkyu Kang,Hoyoung Song,Jonghan Ha 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.7
A test was conducted to investigate the effect of pure biodiesel without additives on formation of particulate matter (PM) and nitrogen oxide (NOx) in the exhaust gas of a diesel engine. Pure biodiesel from waste cooking oil without adding any additive was used. The biodiesel was oxidized at 110 oC for 10 days and blended with commercial automobile diesel oil distributed in the market as a testing fuel. Blended fuels were produced by adding 10% of oxidized biodiesel and un-oxidized biodiesel to automobile diesel oil, respectively. Material properties such as density, kinematic viscosity, oxidation stability, and cetane number were tested. Emission tests were conducted using a large diesel engine of direct injection type, inline six-cylinder, 4 stroke, turbocharger and intercooler. The oxidized and unoxidized biodiesel blends did not show any difference in density and kinematic viscosity. The oxidation stability of the oxidized biodiesel blends was lower than that of the unoxidized biodiesel blends. In the emission test, the two blends showed almost no difference in the total number of concentration of the micro-particles, and also showed almost no difference in particle size distribution such as nucleation mode and accumulation mode. On the other hand, the oxidized biodiesel blends showed less PM and NOx emission than the unoxidized biodiesel blends.
배터리 충전상태가 경유자동차 에너지소비효율에 미치는 영향 연구
김성우(Sungwoo Kim),김기호(Kiho Kim),하종한(Jonghan Ha),권석주(Seokjoo Kwon),서영호(Youngho Seo) 한국자동차공학회 2016 한국 자동차공학회논문집 Vol.24 No.4
Manufacturers have been applying several technologies that can improve the fuel economy of their cars. The regulated voltage control(RVC) system, is one of those technologies being used in passenger cars. In RVC, the voltage of an alternator is controlled depending on the electrical load demand or battery SOC, although each manufacturer differs from another in terms of detail. RVC can reduce the load of an alternator by consuming the stored energy of a battery and simultaneously generate energy. In this paper, a diesel passenger car equipped with an RVC system was tested under FTP-75 and HWFET modes to evaluate fuel economy as their initial battery SOC(100, 90, 80 and 60 %). The test results showed that the initial SOC affects fuel economy only under the FTP-75 mode. FTP-75 fuel economy of the 60% SOC was 13.2 % lower than the 100 % SOC. Also, the simultaneous consumption of the two energy sources did not appear in 60 % SOC.