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정대일,김성엽,이도훈,이용균,박유미,최순규,김동현 동아대학교 환경문제연구소 2000 硏究報告 Vol.23 No.1
Photocatalyzed degradation of acetylene gas was carried out over precoated titanium dioxide(anatase) illuminated UV light in a flow reactor. photocatalytic oxidation of acetylene gas indicated high conversion rates (78.0%) to CO₂gas. And photocatalytic oxidation of gas according to a fold, twofold, and threefold of titanium dioxide(anatase) respectively gave high conversion rates. The longer reaction time was, the higher conversion rate to CO₂ gas showed.
임동균(Dong-gyun IM),신택현(Taek-hyun Shin),박찬석(Chan-seok Park),김도윤(Do-yun Kim) 한국자동차공학회 2022 한국자동차공학회 부문종합 학술대회 Vol.2022 No.6
In this study, the purpose that perform parking durability test in the lab, before actual vehicle parking durability test. We confirm the vehicle loads which transfer to parking system in transmission by measuring the drive shaft torque, when parking position and release parking position on slope. We confirm the parking impact torque when parking position on the slope, the parking pull out torque when release parking position, similarity of the calculated hill climbing resistance and actual hill climbing resistance on the vehicle. Furthermore, confirm the linear proportionality between the hill climbing resistance and the vehicle loads. At the result of this study, the behavior of the vehicle loads that transfer to parking system on slope was confirmed, it will improve the accuracy and reliability of the parking system durability test in the lab.
Park Do-Gyun,Jeong Hyeon-Cheol,Jang Eun-Bin,Lee Jong-Mun,Lee Hyoung-Seok,Park Hye-Ran,Lee Sun-Il,Park Do-Gyun,Jang Eun-Bin,Oh Taek-Keun 한국응용생명화학회 2024 Applied Biological Chemistry (Appl Biol Chem) Vol.67 No.-
Biochar, with its potential to enhance soil fertility, sequester carbon, boost crop yields and reduce greenhouse gas emissions, offers a solution. Addressing the challenges posed by climate change is crucial for food security and agriculture. However, its widespread adoption in agriculture remains in its infancy. This study assessed the effects of rice hull biochar on cabbage production and greenhouse gas emissions, especially nitrous oxide (N 2 O). A trial, employing a randomized block design in triplicate was conducted from September 13 to November 23, 2022, where "Cheongomabi" cabbage was cultivated with N-P 2 O 5 -K 2 O fertilization at 32 $$-$$ - 7.8 $$-$$ - 19.8 kg 10a −1 . Additional fertilizer was applied twice post-sowing. The Biochar application rates were control = 0 ton ha −1 , B1 = 1 ton ha −1 , B3 = 3 ton ha −1 , and B5 = 5 ton ha −1 . The aboveground biomass of autumn cabbage harvested 82 days after sowing was 2.40–2.70 kg plant −1 in the control and biochar treatments (B1, B3, and B5), with no significant differences ( p > 0.05). Cumulative CO 2 emissions during cultivation varied across treatment groups, with initial and cumulative emissions of 10.40–17.94 g m −2 day −1 and 3.63–4.43 ton ha −1 , respectively. N 2 O emissions decreased with higher biochar application: reductions of 2.9%, 25.4%, and 41.1% in the B1, B3, and B5 treatments, respectively, compared to the control. The biochar application had no significant impact on yield but curbed soil emissions, Net ecosystem carbon balance during cabbage cultivation ranged from 0.42 to 3.41 ton ha −1 for the B1, B3, and B5 treatments, respectively, compared to control. Overall, the study underscores biochar’s role in mitigating emissions and boosting soil carbon during cabbage cultivation in fall. Biochar, with its potential to enhance soil fertility, sequester carbon, boost crop yields and reduce greenhouse gas emissions, offers a solution. Addressing the challenges posed by climate change is crucial for food security and agriculture. However, its widespread adoption in agriculture remains in its infancy. This study assessed the effects of rice hull biochar on cabbage production and greenhouse gas emissions, especially nitrous oxide ( N2O). A trial, employing a randomized block design in triplicate was conducted from September 13 to November 23, 2022, where "Cheongomabi" cabbage was cultivated with N-P2O5-K2O fertilization at 32−7.8−19.8 kg 10a− 1. Additional fertilizer was applied twice post-sowing. The Biochar application rates were control = 0 ton ha− 1, B1 = 1 ton ha− 1, B3 = 3 ton ha− 1, and B5 = 5 ton ha− 1. The aboveground biomass of autumn cabbage harvested 82 days after sowing was 2.40– 2.70 kg plant− 1 in the control and biochar treatments (B1, B3, and B5), with no significant differences (p > 0.05). Cumulative CO2 emissions during cultivation varied across treatment groups, with initial and cumulative emissions of 10.40–17.94 g m− 2 day− 1 and 3.63–4.43 ton ha− 1, respectively. N2O emissions decreased with higher biochar application: reductions of 2.9%, 25.4%, and 41.1% in the B1, B3, and B5 treatments, respectively, compared to the control. The biochar application had no significant impact on yield but curbed soil emissions, Net ecosystem carbon balance during cabbage cultivation ranged from 0.42 to 3.41 ton ha− 1 for the B1, B3, and B5 treatments, respectively, compared to control. Overall, the study underscores biochar’s role in mitigating emissions and boosting soil carbon during cabbage cultivation in fall.
How We Have Treated Severe to Critically Ill Patients With Coronavirus Disease 2019 in Korea
Park Do Hyeon,Kang Chang Kyung,Choe Pyoeng Gyun,Kim Nam Joong,Park Wan Beom,Oh Myoung-don 대한의학회 2022 Journal of Korean medical science Vol.37 No.49
Since 2019, the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has spread worldwide, and the coronavirus disease 2019 (COVID-19) pandemic currently continues. In response to this unprecedented pandemic, several researchers and medical staff have struggled to find appropriate treatments for COVID-19. Patients with mild symptoms can recuperate with symptomatic care, however establishing treatment for severe to critically ill patients who can have a high mortality has been essential. Accordingly, the guidelines for COVID-19 treatment have evolved through numerous trials and errors and have been relatively well established to date. In the Republic of Korea, several evidence-based guidelines for COVID-19 treatment were released and revised, reflecting various research and regional medical conditions. To date, approximately 3 years after the beginning of the COVID-19 pandemic, we are reflecting on the changes in the guidelines thus far and have summarized the treatment experience of severe to critically ill patients with COVID-19. The Korean guidelines for COVID-19 treatment have been updated continuously as the National Institutes of Health (NIH) guidelines have changed. Dexamethasone is currently used as the backbone for the treatment of severe to critically ill patients with COVID-19, and remdesivir, baricitinib, and tocilizumab can be added depending on a patient’s situation. In addition, venous thromboembolism prophylaxis is one of the important adjunctive therapies for patients with severe COVID-19. In the clinical field, treatment of severely ill patients with COVID-19 based on guidelines is widely practiced by medical staff and established currently.
Park Do Hyeon,Lee Chan Mi,Chang Euijin,Kang Chang Kyung,Park Wan Beom,Kim Nam Joong,Choe Pyoeng Gyun,Oh Myoung-don 대한의학회 2022 Journal of Korean medical science Vol.37 No.29
Despite the low prevalence of secondary bacterial infection in coronavirus disease 2019 (COVID-19) patients, most of them were administered antibiotic therapy empirically. However, the prognostic impact of empirical antibiotic therapy has not been evaluated. We conducted retrospective propensity score-matched case-control study of 233 COVID-19 patients with moderate to severe illnesses who required oxygen therapy and evaluated whether empirical antibiotic therapy could improve clinical outcomes. Empirical antibiotic therapy did not improve clinical outcomes including length of stay, days with oxygen requirement, the proportion of patients with increased oxygen demand, the proportion of patients who required mechanical ventilation, and overall mortality. This finding implies that routine administration of antibiotics for the treatment of COVID-19 is not essential and should be restricted.
Park Do Hyeon,Lee Eunyoung,Jung Jongtak,Kang Chang Kyung,Song Kyoung-Ho,Choe Pyoeng Gyun,Park Wan Beom,Bang Ji Hwan,Kim Eu Suk,Kim Hong Bin,Park Sang-Won,Kim Nam Joong,Oh Myoung-don 대한의학회 2022 Journal of Korean medical science Vol.37 No.16
Background: The relationship between changes in anxiety levels and personal protective equipment (PPE) use is yet to be evaluated. The present study assessed this relationship among healthcare workers (HCWs) involved in the care of patients with coronavirus disease 2019 (COVID-19). Methods: An online survey was conducted in a municipal hospital with 195 nationally designated negative pressure isolation units in Korea. Anxiety level was measured using the self-rating anxiety scale (SAS), and changes in anxiety levels were assessed based on the time when COVID-19 vaccine was introduced in March 2021 in Korea. Monthly PPE usage between June 2020 and May 2021 was investigated. Results: The mean SAS score (33.25 ± 5.97) was within normal range and was lower than those reported in previous studies conducted before COVID-19 vaccination became available. Among the 93 HCWs who participated, 64 (68.8%) answered that their fear of contracting COVID-19 decreased after vaccination. The number of coveralls used per patient decreased from 33.6 to 0. However, a demand for more PPE than necessary was observed in situations where HCWs were exposed to body fluids and secretions (n = 38, 40.9%). Excessive demand for PPE was not related to age, working experience, or SAS score. Conclusion: Anxiety in HCWs exposed to COVID-19 was lower than it was during the early period of the pandemic, and the period before vaccination was introduced. The number of coveralls used per patient also decreased although an excessive demand for PPE was observed.
박도균 ( Do-gyun Park ),이종문 ( Jong-mun Lee ),강성수 ( Seong-soo Kang ),최은정 ( Eun-jung Choi ),권효숙 ( Hyo-suk Gwon ),이형석 ( Hyoung-seok Lee ),박혜란 ( Hye-ran Park ),이선일 ( Sun-il Lee ) 한국환경농학회 2022 한국환경농학회 학술대회집 Vol.2022 No.-
바이오차(Biochar)는 산소가 없는 조건에서 다양한 유기성 바이오매스를 열분해하여 만든 탄소 함량이 높은 고형물이다. 바이오차를 토양에 투입하면 토양내 미생물 분해 안정성이 높아 100년 이상 반영구적 토양 중 탄소를 격리 및 저장할 수 있다. 또한 토양의 산화력 및 흡착능이 향상되어, 논에서 메탄, 밭에서 아산화질소 배출량을 줄여 농경지에서 배출되는 온실가스를 줄일 수 있다. 수분 보유력 증진 및 이온교환 능력 향상으로 토양개량 효과 있는 것으로도 평가되고 있다. 따라서 기후변화에 관한 정부간 협의체 (IPCC: Intergovernmental Panel on Climate Change)에서 토양개량형 탄소격리 소재로 인정하였으며, 2019 IPCC 개정판에서는 바이오차의 원료 및 생산과정별 탄소 고정값을 제시하였다. 우리나라는 이러한 탄소 고정값을 활용하여, 온실가스 감축 사업에 적용할 수 있는 농업·농촌 자발적 온실가스 감축 사업 방법론을 2021년 5월 등록하였다. 국내 온실 가스 배출 저감을 위한 바이오차 적용 연구 결과를 보면 벼 재배지 논에 바이오차 투입에 따라 메탄 배출은 33.4∼48.1% 저감, 옥수수 재배 밭의 경우 아산화질소 배출은 5.2∼53.3% 줄었던 연구 사례가 있다, 국외 바이오차 적용에 따른 아산화질소 배출연구를 종합적으로 평가한 메타분석 결과에 따르면, 바이오차 투입에 따른 아산화질소 배출은 32∼54% 저감 되고, 작물 생산성은 평균 11% 증가하는 것으로 평가되었다. 농업에서 토양개량제 위주로 활용되고 있으며, 최근 바이오차의 보비력, 보수력이 작물생육에 유리한 효과가 주목받으며 육묘장의 상토, 고설재배와 양액재배의 배지의 용토 등으로 활용 범위를 넓히고 있다. 2021년 바이오차의 전 세계 시장규모를 예측한 보고서에 따르면, 2026년 32억 달러, 2031년 64억 달러가 될 것으로 예측된다. 이러한 바이오차가 활용되는 시장 규모는 점점 증가할 것으로 전망된다.