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윤여일,윤석기,김선규,김용현,남일송,차건영,황의원,김영선 순천향의학연구소 2001 Journal of Soonchunhyang Medical Science Vol.7 No.2
Background: The diabetic patients are at significantly increased risk of developing vascular disease. It's etiology may involve oxidative damage by free radiacals and protection againse such damage can be offered by antioxidants. We investigated that oxidative stress as assessed by measurement of total antioxidant status may play a role in development of diabetes mellitus. Method: We measured total antioxiant status using merchandised kit, glycated hemeglobin(HbA1c) in 46 type 2 diabetes mellitus patients and 50 healthy matched control subjects. Result: The total antioxidant status(TAS) was 2.10(±0.04) mmol/L in uncontrolled type 2 DM patients, 2.60(±0.03) in controlled type 2 DM patients and 2.70(±0.16) in healthy control subjects. TAS was significantly lower(P<0.05) in uncontrolled type 2 DM patients, but no significant association between in controlled type 2 DM patients and healthy control subjects. The TAS was 2.00(±0.17) mmol/L in complicated type 2 DM patients and 2.10(±0.29) uncomplicated type 2 DM patients. There was no significant associations between complicated type 2 DM patients and uncomplicated type 2 DM patients. Conclusion: Poor glycemic control is associated with reduced TAS in type 2 DM patients. TAS was thought indirect index that predict glycemic control of type 2 DM patients.
Design of Agricultural Drying System using Conical Solar Concentrators
( Seong Geon Hwang ),( Mun Soo Na ),( Joo Hee Lee ),( Gwi Hyun Lee ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
The main purpose of this study is to utilize solar power effectively in agricultural drying system. Since solar energy is low-density energy, it should have more collecting efficiency. In this study, we intend to design an agricultural drying system using the conical solar concentrator. Drying room was manufactured with insulated polyurethane panel of 100mm and a control box was installed to control the appropriate drying temperature. Inside the drying room, heat exchanger was installed to use the heating medium accumulated by conical solar concentrators with a fan to circulate heated air, and a temperature sensor was fixed to measure the drying temperature. Also, solenoid valves and temperature control limits were installed to control the circulation of heating medium. When heating medium in the storage tank heated by the conical solar concentrators is reached at the set drying temperature, a control device detects the temperature of the heating medium and operates the circulation pump and the solenoid valve of ON/OFF. When the temperature of the heating medium in the heat storage tank was reached at 70˚C, it was begun with an initial temperature of around 28˚C inside the drying room. Temperature and humidity changes in the drying room were measured, when the set drying temperatures were reached to 40˚C, 50˚C, and 60˚C, respectively. As the set drying temperature was higher, the degree of temperature and humidity change was lower.
황성근 ( Seong Geon Hwang ),이주희 ( Joo Hee Lee ),이귀현 ( Gwi Hyun Lee ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.2
태양에너지를 효율적으로 이용하기 위해 집광기 형태 개발 및 설치방식 등 많은 연구가 진행되고 있다. 본 연구에서는 태양열 집광시스템의 집열효율 향상을 위해 태양 복사열 회수의 극대화를 위한 열매체로 열전도율을 향상시킨 나노입자를 제조하였다. 또한 나노유체를 이용하여 프레넬 집광시스템의 집열효율을 분석하였다. 나노유체 제조를 위한 나노입자의 종류는 CuO, Al2O3를 사용하였으며, 입자크기는 각각 50~100nm, 50nm이다. 나노유체는 1차 증류수에 나노입자와 분산안정성을 높여주는 계면활성제 CTAB (Cetyltrimethylammonium bromide) 또는 AG (Arabic Gum)를 첨가하여 초음파 분산기를 이용하여 제조하였다. 나노입자의 농도는 증류수의 0.05%를 기준으로 하였으며, 계면활성제 AG의 농도는 나노입자의 양을 기준으로 1/4배, 1/2배, 1배를 첨가하였고, CTAB는 CMC (Critical Micelle Concetration) 기준으로 1/10배, 1배, 10배를 각각 첨가하였다. 프레넬 집광시스템의 열매체로 이용하기 위해 제조된 나노유체의 열전도율은 열특성 분석기(KD2)로 측정하였다. 열전도율 측정 결과 Al<sub>2</sub>O<sub>3</sub>와 CTAM (1/10배)를 첨가하여 만든 나노유체와 CuO와 AG (1/2배)를 첨가하여 만든 나노유체가 가장 높게 나타났다. 따라서 프레넬 집광시스템의 열매체로 물, CuO-AG (1/2배) 나노유체, Al<sub>2</sub>O<sub>3</sub>-CTAB (1/10배) 나노유체, 3종류를 이용하여 동일한 유량 하에서 청명한 날 집열효율 분석실험을 수행하였다. 집열효율을 분석한 결과 열매체로 Al<sub>2</sub>O<sub>3</sub>-CTAB (1/10배) 나노유체, CuO-AG (1/2배) 나노유체, 물의 순으로 집열효율이 높게 나타났다.
Cold Damages Occurred in 2021 on Olive Trees Planted at Coastal Regions in Geongsangnam-do
Seong-Tae Choi,Mi-Geon Cheon,Seo-Hyeon Lee,Kyoung-Mi Park,Yeon-Hyeon Hwang,Young-Ho Chang 한국원예학회 2021 한국원예학회 학술발표요지 Vol.2021 No.10
With global warming, growing olive trees has been tested in some coastal areas of Gyeongsangnam-do Province. However, there is a high risk of cold damage due to a sudden drop of temperature during winter. To provide safety cultivation guidelines, we investigated various cold damages depending on different mean temperatures, cultivars, and tree ages in three coastal regions in Geongsangnam-do where the temperature dropped to below –9°C in early January, 2021. When the temperature fell to –9.9°C at a district in Geoje City, most trees (‘Maurino’ and ‘Coratina’) under 3 years of age died of cold damage, while trees (‘Hojiblanka’, ‘Arbosana’, ‘Koroneiki’, ‘Manzanillo’, ‘Arbequina’, and ‘Lucca’) over 5 years old were not affected by the low temperature. On the other hand, 2 years old seedlings showed a wide range of cold damage degree, probably due to their genetic differences. At a field of the minimum temperature –11.5°C in Namhae County, leaves of adult trees (unknown cultivar) over 10 years old were defoliated by about 10% of the total without other damages. However, all the leaves of citron trees 5 m away from the olive rows dried up, and more than 50% of one year old shoot died. In Goseong County, most of 1 to 2 years old branches in 5 to 6 years old olive trees (unknown cultivar) died at a field of the minimum temperature –13.5°C. Therefore, growing olives would be possible in the areas above mean temperature –10°C where citron trees can be cultivated safely, but for the trees under 4 years old, measures to prevent cold damage should be followed.
Hwang, Kyu-Man,Park, Jun-Young,Bae, Hagyoul,Lee, Seung-Wook,Kim, Choong-Ki,Seo, Myungsoo,Im, Hwon,Kim, Do-Hyun,Kim, Seong-Yeon,Lee, Geon-Beom,Choi, Yang-Kyu American Chemical Society 2017 ACS NANO Vol.11 No.12
<P>A physical unclonable function (PUF) device using a nano-electromechanical (NEM) switch was demonstrated. The most important feature of the NEM-switch-based PUF is its use of stiction. Stiction is one of the chronic problems associated with micro- and nano-electromechanical system (MEMS/NEMS) devices; however, here, it was utilized to intentionally implement a PUF for hardware-based security. The stiction is caused by capillary and van der Waals forces, producing strong adhesion, which can be utilized to design a highly robust and stable PUF. The probability that stiction will occur on either of two gates in the NEM switch is the same, and consequently, the occurrence of the stiction is random and unique, which is critical to its PUF performance. This uniqueness was evaluated by measuring the interchip Hamming distance (interchip HD), which characterizes how different responses are made when the same challenge is applied. Uniformity was also evaluated by the proportion of “1” or “0” in the response bit-string. The reliability of the proposed PUF device was assessed by stress tests under harsh environments such as high temperature, high dose radiation, and microwaves.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2017/ancac3.2017.11.issue-12/acsnano.7b06658/production/images/medium/nn-2017-066583_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn7b06658'>ACS Electronic Supporting Info</A></P>
A Reconfigurable Rectified Flexible Energy Harvester via Solid-State Single Crystal Grown PMN-PZT
Hwang, Geon-Tae,Yang, Joonseok,Yang, Seong Ho,Lee, Ho-Yong,Lee, Minbok,Park, Dae Yong,Han, Jae Hyun,Lee, Seung Jun,Jeong, Chang Kyu,Kim, Jaeha,Park, Kwi-Il,Lee, Keon Jae Wiley Blackwell (John Wiley Sons) 2015 ADVANCED ENERGY MATERIALS Vol.5 No.10
Mi Geon Cheon,Seo Hyoun Lee,Kyung Mi Park,Seong-Tae Choi,Yeon Hyeon Hwang,Young Ho Chang 한국토양비료학회 2021 한국토양비료학회지 Vol.54 No.3
This experiment was conducted to evaluate the usefullness of cocopeat as a soil medium in blueberry cultivation. Two-year-old northern highbush blueberry ‘Duke’ and southern highbush blueberry ‘Spring High’ were planted in soil medium mixed with peatmoss (soil:peatmoss (v/v), 1:1) or cocopeat (soil:cocopeat (v/v), 1:1) in open fields in 2019. Soil pH measured in 2020 and 2021 ranged from 4.2 to 5.0 in peatmoss and 5.2 to 5.8 in cocopeat medium, indicating peatmoss has more suitable pH for blueberry growth. Two years soil analyses indicated that peatmoss medium tended to contain a higher available P2O5 content and lower exchangeable cations compared with those of cocopeat. In 2021, peatmoss medium significantly increased the number of shoots per bush, by 16% for ‘Duke’ and 92% for ‘Spring High’ compared with the cocopeat. Bushes from peatmoss medium produced yield 1.9- to 2.7-fold higher for two years in ‘Duke’ and 1.4- to 1.8-fold higher in ‘Spring High’ compared with respective yields from cocopeat. Fruit characteristics for two years were not consistently affected by different soil media, except that the acidity was slightly higher in peatmoss. The results suggested that since the better bush growth from peatmoss medium resulted mainly from lower soil pH, the use of cocopeat as a soil medium should be followed by pH adjustment.