Assessment on Damage Risk of Corn for High Temperature at Reproductive Stage in Summer Season Based on Climate Scenario RCP 8.5 and 4.5

Seo, Myung-Chul,Cho, Hyeon-Suk,Kim, Jun-Hwan,Sang, Wan-Gyu,Shin, Pyeong,Lee, Geon Hwi 한국토양비료학회 2017 한국토양비료학회지 Vol.50 No.1

In order to assess risk of high temperature damages about corn during reproduction stages in the future, we carried out analysis of climate change scenarios RCP (Representative Concentration Pathway) 4.5 and RCP8.5 distributed by KMA (Korea Meteorological Administration) in 2012. We established two indexes such as average of annual risk days of high temperature damage which express frequency and strengthen index of high temperature damage. As results of producing maps for 157 cities and counties about average of annual risk days of high temperature damage during total periods of scenarios, the risk of high temperature in RCP8.5 was evaluated to increase at all over nation except inland area of Gangwon province, while RCP4.5 showed similar to present, or little higher. The maps of annual risk days of high temperature damage with 10 years interval in RCP8.5 prospected that the risk for damaging corn growth would increase rapidly from 2030's. The largest risk of high temperature damage in the future of RCP8.5 was analyzed at Changnyeong county located east-south inland area in Kyeongnam province, while the smallest of risk counties were Pyeongchang, Taebaek, Inje, and Jeongseon. The prospect at 12 counties which is large to produce corn at present and contains large plains have been showed that there will be only a little increase of risk of high temperature at Goesan, Yangpyeong, Hongcheon, Seosan, and Mooju until 2060's. But considering strengthen index of high temperature damage, most regions analyzed would be prospected to increase rapidly after 2030's. To cope with high temperature damage of corn in the future, we should develop various practical technologies including breeding adapted varieties and controlling cultivation periods.

A Study on Grain Yield Response and Limitations of CERES-Barley Model According to Soil Types

Sang, Wan-Gyu,Kim, Jun-Hwan,Shin, Pyeong,Cho, Hyeoun-Suk,Seo, Myung-Chul,Lee, Geon-Hwi 한국토양비료학회 2017 한국토양비료학회지 Vol.50 No.6

Crop simulation models are valuable tools for estimating crop yield, environmental factors and management practices. The objective of this study was to evaluate the effect of soil types on barley productivity using CERES (Crop Environment REsource Synthesis)-barley, cropping system model. So the behavior of the model under various soil types and climatic conditions was evaluated. The results of the sensitivity analysis in temperature, $CO_2$, and precipitation showed that soil types had a direct impact on the simulated yield of CERES-barley model. We found that barley yield in clay soils would be more sensitive to precipitation and $CO_2$ in comparison with temperature. And the model showed limited accuracy in simulating water and nitrogen stress index for soil types. In general, the barley grown on clay soils were less sensitive to water stress than those grown on sandy soils. Especially it was found that the CERES model underestimated the effect of water stress in high precipitation which led to overprediction of crop yield in clay soils. In order to solve these problems and successfully forecast grain yield, further studies on the modification of the water stress response of crops should be considered prior to use of the CERES-barley model for yield forecasting.

Control of Cathode Arc Root Behavior in a Reverse Polarity Hollow Electrode Plasma Torch Using an Exit Nozzle

Sang-Min Jeong,Darian Figuera-Michal,Dong-Hyun Lee,Min-Gyu Choi,Jun-Ho Seo 한국진공학회(ASCT) 2021 Applied Science and Convergence Technology Vol.30 No.6

In this study, a hollow electrode plasma torch with a cylindrical exit nozzle was proposed and tested to control the behavior of cathode arc roots in the reverse polarity electrical connection for the non-transferred mode operation. The test results revealed that in the absence of an exit nozzle, cathode arc roots cause arcing on the electrically floated torch housing, producing an unstable plasma jet. However, in the presence of an exit nozzle, when injecting the secondary gas with a swirl through a gap between the exit nozzle and front electrode, it was confirmed that cathode arc roots can be controlled to form only on the surface of the front electrode, producing a stable plasma jet without arcing on the torch housing. Additionally, the presence of an exit nozzle was observed to have little influence on the voltage–current characteristics of a reverse polarity hollow electrode plasma torch. Instead, heat loss to the coolant was reduced compared to that in the absence of an exit nozzle, thereby improving thermal efficiency.

Anti-obesity effects of $Lysimachia$ $foenum-graecum$ characterized by decreased adipogenesis and regulated lipid metabolism

Seo, Jong-Bae,Choe, Sung-Sik,Jeong, Hyun-Woo,Park, Sang-Wook,Shin, Hyun-Jung,Choi, Sun-Mi,Park, Jae-Young,Choi, Eun-Wook,Kim, Jae-Bum,Seen, Dong-Seung,Jeong, Jae-Yeon,Lee, Tae-Gyu Korean Society for Biochemistry and Molecular Bion 2011 Experimental and molecular medicine Vol.43 No.4

$Lysimachia$ $foenum-graecum$ has been used as an oriental medicine with anti-inflammatory effect. The anti-obesity effect of $L.$ $foenum-graecum$ extract (LFE) was first discovered in our screening of natural product extract library against adipogenesis. To characterize its anti-obesity effects and to evaluate its potential as an anti-obesity drug, we performed various obesity- related experiments $in$ $vitro$ and $in$ $vivo$. In adipogenesis assay, LFE blocked the differentiation of 3T3-L1 preadipocyte in a dose-dependent manner with an IC50 of $2.5{\mu}g/ml$. In addition, LFE suppressed the expression of lipogenic genes, while increasing the expression of lipolytic genes $in$ $vitro$ at $10{\mu}g/ml$ and $in$ $vivo$ at 100 mg/kg/day. The anti-adipogenic and anti- lipogenic effect of LFE seems to be mediated by the inhibition of PPAR${\gamma}$ and C/EBP${\alpha}$ expression as shown in $in$ $vitro$ and $in$ $vivo$, and the suppression of PPAR${\gamma}$ activity $in$ $vitro$. Moreover, LFE stimulated fatty acid oxidation in an AMPK-dependent manner. In high-fat diet (HFD)-induced obese mice (n = 8/group), oral administration of LFE at 30, 100, and 300 mg/kg/day decreased total body weight gain significantly in all doses tested. No difference in food intake was observed between vehicle- and LFE-treated HFD mice. The weight of white adipose tissues including abdominal subcutaneous, epididymal, and perirenal adipose tissue was reduced markedly in LFE-treated HFD mice in a dose-dependent manner. Treatment of LFE also greatly improved serum levels of obesity-related biomarkers such as glucose, triglycerides, and adipocytokines leptin, adiponectin, and resistin. All together, these results showed anti-obesity effects of LFE on adipogenesis and lipid metabolism $in$ $vitro$ and $in$ $vivo$ and raised a possibility of developing LFE as anti-obesity therapeutics.

Effect of vacuum blending on antioxidant activities of apple juice and blueberry juice

Sung-Gyu Lee,Min-Seo Lee,Soo-Min Seo,Seong-Yun Park 한국식물생명공학회 2021 JOURNAL OF PLANT BIOTECHNOLOGY Vol.48 No.4

The present study aimed to assess and compare the quality characteristics and antioxidant activities of apple juice and blueberry juice at hourly intervals over a period of time based on the presence or absence of vacuum blending (0 and 800 hPa) using a household blender. Measurement of the dissolved oxygen content revealed that the removal rates of dissolved oxygen were approximately 83% and 86% in the apple and blueberry juice samples, respectively, after vacuum blending. Moreover, compared with general blending, there was little change in the antioxidant property and degree of browning over time with vacuum blending. Furthermore, hourly assessments revealed that the decrease in the poly- phenol and flavonoid contents in the apple and blueberry juice samples was significantly lesser with vacuum blending for 3, 6, and 12 h than with general blending. Assessment of the change in ferric reducing antioxidant power (FRAP) activity over time revealed that the rate of decrease in FRAP activity over time was lower with vacuum blending than with general blending for both juice samples. ABTS and DPPH radical scavenging assays performed to determine the change in free radical scavenging activity revealed inhibitory activity at 0, 3, 6, and 12 h and confirmed that vacuum blending resulted in long-lasting antioxidant activities in both apple and blueberry juice samples. Taken together, the present results confirmed that vacuum blending is associated with superior quality maintenance and antioxidant properties in comparison with general blending.

Clinical utility of the 2-line high-intensity focused ultrasound for skin tightening in Republic of Korea: retrospective clinical study

Sang Hun Kim,Seo Koo Lee,Han Gyu Cha,Eun Soo Park 대한의학레이저학회 2023 MEDICAL LASERS Vol.12 No.1

Background: High-intensity focused ultrasound (HIFU) is a widely used procedure for skin rejuvenation because it targets only the superficial musculoaponeurotic system layer with coagulated thermal energy. However, its long procedure time is inconvenient for both the patient and the operator. The purpose of this study was to investigate the clinical effects of 2-line HIFU.Methods: Between August 2021 and September 2022, patients with sagging and loose facial skin were treated with a 2-line HIFU (10thera®) following the manufacturer’s recommended protocol. We evaluated patients using an automatic skin diagnosis system at the pretreatment stage and about three months after treatment.Results: All patients were treated using the 2-line HIFU. Five patients were lost to follow-up. The median procedure time was 14 minutes. The mean skin grade was 17 at pretreatment and 14 at posttreatment, showing a significant (p < 0.01) difference between the two.Conclusion: This study suggests that the 2-line HIFU can improve wrinkling and sagging of an aging face. It is believed that the shortened treatment time would improve the satisfaction levels of both the operator and the patient.

Effect of Glycerol and DMA on Alanyl Glutamine Diluent for Semen in Ogye(Korea Native Black Chicken)

Seo-yeong Yang,Jin Seok Choi,Hyun Kim,Yeoung-Gyu Ko,Jae-Hwan Kim,Seong Bok Choi,Yoon-Jung Do,Soo Bong Park,Hun Dong Kim,Sung Woo Kim 한국동물번식학회 2012 Reproductive & Developmental Biology(Supplement) Vol.36 No.2s

Cryopreservation of avian semen is a useful tool to preserve genetic resource for aim of preventing extinction induced by infectious disease like avian influenza. Unlike those of mammals, data from chicken cryopreserved semen has not been showed feasible results. So, various cryoprotectants and diluents have been examined in many methods. In this report, as a major ingredient of avian seminal plasm, glutamine was substituted by alanyl glutamine to enhance physiological stability of chicken semen during freezing. We studied effect of glycerol and Dimethylacetamide(DMA) on motility and progressive motility of spermatozoa using glutamine diluent(EK-G) or alanyl glutamine diluent(EK-A) condition. The semen of Ogye was collected twice a week by the dorso-abdominimal massage method and diluted with same volume of EK-G or EK-A at 25℃ and stored for 10 min at 4℃ in cold chamber. Glycerol or DMA was added to diluted semen to reached 7% of final concentration at 4℃. After 3min of equilibration, the diluted semen was packed into 0.25ml straws and subjected to cryopreservation used freezing equipment. The packed straw were placed on height 5 cm above surface of liquid nitrogen(LN2) and held for 10min. After preserved for 2 weeks, the straw was thawed onto the 4℃ cooling bath. The images of motility and progressive motility spermatozoa were recorded by digital image recorder and analyzed by manual. The results showed 68.5% motility and 34.1% progressive motility in DMA/EKA diluent, 31.45% and 17.6% in glycerol/EKA, 45.4% and 8.6% in DMA/EKG, and 9.7% and 6.4% in glycerol/EKG. With these results, the alanyl glutamine and DMA could be used as a main composition of diluent and cryoprotectant for cryopreservation of chicken semen.

Multiple Cavitary Pulmonary Nodules Caused by Mycobacterium intracellulare

Sang Hoon Yoo,Seo Ree Kim,Joon Young Choi,Jae Woo Choi,Yu Mi Ko,Sun Hee Jang,Jun Kyu Park,Ye Gyu Sung,Yun Jung Park,Su Yun Oh,Se Young Bahk,Ju Hyun Lee,Myung Sook Kim 대한가정의학회 2016 Korean Journal of Family Medicine Vol.37 No.4

Nontuberculous mycobacteria (NTM) have been increasingly recognized as an important cause of chronic pulmonary infections. The Mycobacterium avium complex (MAC), which is composed of two species, Mycobacterium avium and Mycobacterium intracelluare, is the most commonly encountered pathogen associated with NTM lung disease. MAC pulmonary infection typically presents in a fibrocavitary form or a nodular bronchiectatic form. However, there have been atypical presentations of MAC pulmonary infections, including solitary pulmonary nodules (SPN). There have been several previous reports of SPN due to MAC infection in the United States, Japan, and Korea. In 2009, Sekine and colleagues reported a case of MAC pulmonary infection presenting with multiple nodules. To date, however, there have been no cases of NTM lung infection with multiple cavitary pulmonary nodules, and neither a fibrotic change nor nodular bronchiectasis. The present case showed a multiple cavitating nodular lung infection due to MAC, which is very rare and different from the typical presentation of MAC pulmonary infections. We also showed that percutaneous transthoracic needle aspiration can be a useful diagnostic tool to evaluate a case of multiple cavitary nodules.

Prevalence of Obesity and Incidence of Obesity-Related Comorbidities in Koreans Based on National Health Insurance Service Health Checkup Data 2006–2015

Seo, Mi Hae,Kim, Yang-Hyun,Han, Kyungdo,Jung, Jin-Hyung,Park, Yong-Gyu,Lee, Seong-Su,Kwon, Hyuk-Sang,Lee, Won-Young,Yoo, Soon Jib Korean Society for the Study of Obesity 2018 Journal of obesity & metabolic syndrome Vol.27 No.1

<P><B>Background</B></P><P>The prevalence of obesity and related comorbidities is increasing worldwide, including in Korea. The Korean Society for the Study of Obesity released the Obesity Fact Sheet 2017 to address this problem in the Korean population.</P><P><B>Methods</B></P><P>Data from the National Health Insurance Service Health Checkup database from 2006 to 2015 were standardized by age and sex using the 2010 Census. The definition of obesity was a body mass index (BMI) ≥25 kg/m<SUP>2</SUP>, and that of abdominal obesity was a waist circumference ≥90 cm in men and ≥85 cm in women. Multivariate adjusted Cox regression analysis was conducted, and hazard ratios (HRs) with 95% confidence intervals were calculated for comorbidities.</P><P><B>Results</B></P><P>From 2009 to 2015, the prevalence of obesity increased from 29.7% to 32.4%, and that of abdominal obesity increased from 18.4% to 20.8%. Obesity with abdominal obesity also increased from 15.1% to 17.7%. Between 2014 and 2015, the prevalence of obesity increased until 30–40 years of age, but decreased from 40–50 years of age in men. In women, it increased until the mid-70s, and decreased thereafter. Abdominal obesity increased from 20–30 years of age to 70–80 years of age, but decreased thereafter. The HRs for type 2 diabetes mellitus, hypertension, dyslipidemia, myocardial infarction, and ischemic stroke were elevated in subjects with abdominal obesity, and their incidence increased as the BMI increased, but slowed down at BMI ≥35 kg/m<SUP>2</SUP>.</P><P><B>Conclusion</B></P><P>Based on the Obesity Fact Sheet 2017, strategies for reducing the prevalence of obesity and abdominal obesity are essential.</P>

UWB Direct Sequences Chaotic Communications System

Sang-Yub Lee,Wan-Cheol Yang,Man-Seok Seo,Kwang-Du Lee,Sang-Gyu Park,Chang-Soo Yang 한국통신학회 2006 한국통신학회 학술대회논문집 Vol.2006 No.7