http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
그린수소 기반 섹터 커플링 통한 재생에너지 출력제한 경감효과 연구
전우영 ( Wooyoung Jeon ),김진이 ( Jin-yi Kim ),이성우 ( Seongwoo Lee ) 한국신·재생에너지학회 2022 신재생에너지 Vol.18 No.2
The Korean government announced the “1st Basic Plan for the Transition to Hydrogen Economy” in 2021 and declared the establishment of a hydrogen industry ecosystem by 2040. To build a low-carbon power system, resources that can efficiently accommodate renewable energy are required, and green hydrogen is considered a potential solution. This study analyzed the economic feasibility of green hydrogen-based sector coupling to reduce curtailment of renewable generation in the Jeju power system by 2025 under the scenario of with or without HVDC#3. The result showed that HVDC#3 significantly reduced the frequency of curtailment from 16.1% to 3.0%. In addition, green hydrogen-based sector coupling was an economically feasible option as result showed an IRR of 4.86% when HVDC#3 was connected and 11.45% when it was not under the condition of achieving 50% curtailment reduction. This study shows that the higher the level of renewable energy deployment, the more delayed the HVDC connection between Jeju and the main land, and the lower the SMP, the more economically feasible the green hydrogen-based sector coupling is. Furthermore, this study suggests that the policy goal of completely reducing curtailment is not economically efficient.
( Heeyoung Hwang ),( Seongwoo Jeon ),( Hyunseok Lee ),( Jaekwang Lee ),( Junyoung Choi ),( Haemin Yang ),( Sungkuk Kim ) 대한내과학회 2014 대한내과학회 추계학술발표논문집 Vol.2014 No.1
Background: For differentiated type early gastric cancer (EGC) without lymph node metastasis, endoscopic submucosal dissection (ESD) is thought to be an alternative curative treatment. This study aims to verify the therapeutic usefulness of ESD for differentiated type EGC treatment compared to gastrectomy. Methods: This study was a retrospective cohort study and included 387 differentiated type EGC cases treated at a single tertiary medical center from march 2006 to may 2010. Propensity score matching of the cohort yield 280 matched patients. We classi- fi ed the enrolled cases into ESD group(176 cases) and gastrectomy group(104 cases). We reviewed medical records and compared baseline demographics, pathologic characteristics, in hospital course, complication and survival of the two groups. Results: There was no difference in baseline demographics, comorbidity and follow-up months between two groups. The median follow-up duration was 55 months in the ESD group and 53 months in the gastrectomy group (p = 0.633) . There was higher complication rate in the gastrectomy group than ESD group (14.4% vs. 5.1%; p = 0.007). The gastrectomy group had longer hospital stay compared with ESD group (8.0 days vs. 2.0 days; p<0.001). The 5-year survival rates of the ESD group and gastrectomy group were not different (Log Rank p=0.576). Conclusions: In this study, long-term survival rate of ESD was equivalent to gastrectomy. ESD was associated with shorter hospital stay and lower complication rate.
전종길 ( Jonggil Jeon ),이상봉 ( Sangbong Lee ),김민영 ( Minyoung Kim ),이성우 ( Seongwoo Lee ) 한국농공학회 2009 한국농공학회 학술대회초록집 Vol.2009 No.-
논에 인삼을 재배할 경우 우기 시에는 배수불량으로 인한 인삼 생육불량 및 습해가 발생되고, 가뭄 시에는 지나친 건조에 의한 인삼 생육불량 문제가 발생됨에 따라 이러한 문제점을 해결하고자 지중 관배수시스템을 설계ㆍ제작하고, 현장 성능시험을 실시한 결과 다음과 같은 결과를 얻었다. 첫째, 지중 관배수시스템은 토양수분센서의 신호값과 사용자의 설정 기준값을 비교하여 토양이 건조할 때는 구동펌프를 작동시키고, 토양이 과습할 때는 지중 암거 밸브인 솔레노이드밸브를 작동시켜 암거배수되는 장치로 컨트롤러, 토양수분센서(TDR), 펌프(1/3Hp, 30L/min), 솔레노이드 밸브, 물탱크 등으로 구성된다. 둘째, 사질식양토의 논에 지중 관수효과시험을 실시한 결과 흡수거 폭 크기별 시험에서는 10, 20, 30㎝ 중폭 10㎝가 가장 효과가 좋았으며, 상대적으로 폭 20, 30㎝에서는 효과가 미미 하였다. 셋째, 지중 배수효과시험에서는 36㎜ 강우 후 4일간 초기 물빠짐 정도, 즉 토양수분변화는 흡수거 3, 5, 7m 간격별로 평균 토양수분 장력값이 82.6, 66.0, 47.5kPa로 나타나 무처리구의 27.9kPa에 비해 평균적으로 약 234% 높게 나타났으며, 간격 중에는 인삼 생육 및 경제성을 고려할 때 7m 간격이 좋은 것으로 판단된다. 넷째, 지중 관배수장치 설치 후 평균 지하수위는 -41.6㎝로 무처리구의 -5.1㎝에 비해 36.5㎝ 지하수위가 낮았으며, 깊이는 논 바닥 평균면에서 지중 50㎝(인삼 두둑 윗면에서 65㎝) 깊이가 양호한 것으로 나타났다. 다섯째, 인삼 수확량에서는 무처리구가 6,055kg/ha, 암거처리구 평균이 6,951kg/ha로 처리구에서 약 15% 증수되는 것으로 나타났으며, 인삼생육조사에서 처리구의 간격, 깊이에 따라 차이가 있지만, 지하부 생존율, 동체장, 근중은 암거처리구 평균이 각각 61.1%, 6.7㎝, 108.5g/3.3㎡인 반면, 무처리구에서는 44.4%, 5.8㎝, 94.5g/3.3㎡로 나타났다. 마지막으로 경제성 분석결과 지중 관배수장치 설치로 인하여 추가적으로 증가되는 비용은 암거 흡수거간격을 3, 5, 7m로 하였을 때, 각각 연간 2,161,059원/ha, 1,592,256원/ha, 1,325,532원/ha이며, 생산량 증가에 따른 연간 소득증대 효과는 2,626,561원/ha, 4,002,579원/ha, 3,278,377원/ha으로 나타났다.
Lee, Sunghoon,Jeon, Byungjoo,Kang, Taewook,Lee, Wunho,Malik, Afandi Mohammad,Park, Seongwoo,Lim, Jimin,Park, Boowon,Jeong, Yongseok,kim, Jongsu Elsevier 2018 Journal of luminescence Vol.196 No.-
<P><B>Abstract</B></P> <P>Green-emission Zn<SUB>2</SUB>SiO<SUB>4</SUB>:Mn<SUP>2+</SUP> powder phosphor was applied for powder electroluminescence device through a screen printing method. The EL device consisted of silver nanowires as top electrode, 6μm-thick Zn<SUB>2</SUB>SiO<SUB>4</SUB>:Mn<SUP>2+</SUP> phosphor layer, 45µm -thick BaTiO<SUB>3</SUB> dielectric layer, and metal bottom electrode. The EL device showed the strong 525nm green emission spectrum. Its luminance-voltage dependence showed the exponential increase, and its luminance-frequency dependence showed the linear increase and then saturation behavior. It is notable that its temperature dependence showed the constant behavior at lower temperature, and then the drastic rising pattern up to Curie temperature of the dielectric layer (~ 120°C), and then the thermal quenching trend. The maximum luminance was 0.96cd/m<SUP>2</SUP> where the power consumption was 250W/m<SUP>2</SUP> at 420Vp and 400Hz, and thus the luminous efficiency was 0.012lm/W.</P>
Choi Jah Yeon,Kim Mi-Na,Han Seongwoo,Lee Sunki,Park Myung Soo,Kong Min Gyu,Kim Sung-Hea,Kim Yong-Hyun,Jo Sang-Ho,Kim Sungeun,Choi Seonghoon,Jeon Jinsung,Lee Jieun,Battumur Byambakhand,Park Seong-Mi,Ki 대한심부전학회 2024 International Journal of Heart Failure Vol.6 No.3
Background and Objectives Heart failure (HF) is a leading cause of hospitalization and death worldwide. The Steady Movement with Innovating Leadership for Heart Failure (SMILE HF) aims to evaluate the clinical characteristics, management, hospital course, and long-term outcomes of patients hospitalized for acute HF in South Korea. Methods This prospective, observational multicenter cohort study was conducted on consecutive patients hospitalized for acute HF in nine university hospitals since September 2019. Enrolment of 2000 patients should be completed in 2024, and follow-up is planned through 2025. Results Interim analysis of 1,052 consecutive patients was performed to understand the baseline characteristics. The mean age was 69±15 years; 57.6% were male. The mean left ventricular ejection fraction was 39±15%. The prevalences of HF with reduced ejection fraction, HF with mildly reduced ejection fraction, and HF with preserved ejection fraction were 50.9%, 15.3%, and 29.2%. Ischemic cardiomyopathy (CMP) was the most common etiology (32%), followed by tachycardia-induced CMP (12.8%) and idiopathic dilated CMP (9.5%). The prescription rate of angiotensin-converting enzyme inhibitor/angiotensin receptor blockers/angiotensin receptor/neprilysin inhibitor, beta-blockers, spironolactone, and sodium-glucose cotransporter-2 inhibitors at discharge were 76.8%, 66.5%, 50.0%, and 17.5%, respectively. The post-discharge 90-day mortality and readmission rates due to HF aggravation were 2.0% and 6.4%, respectively. Our analysis reveals the current state of acute HF in South Korea. Conclusions Our interim analysis provides valuable insights into the clinical characteristics, management, and early outcomes of acute HF patients in South Korea, highlighting the current state and treatment patterns in this population. Background and Objectives Heart failure (HF) is a leading cause of hospitalization and death worldwide. The Steady Movement with Innovating Leadership for Heart Failure (SMILE HF) aims to evaluate the clinical characteristics, management, hospital course, and long-term outcomes of patients hospitalized for acute HF in South Korea. Methods This prospective, observational multicenter cohort study was conducted on consecutive patients hospitalized for acute HF in nine university hospitals since September 2019. Enrolment of 2000 patients should be completed in 2024, and follow-up is planned through 2025. Results Interim analysis of 1,052 consecutive patients was performed to understand the baseline characteristics. The mean age was 69±15 years; 57.6% were male. The mean left ventricular ejection fraction was 39±15%. The prevalences of HF with reduced ejection fraction, HF with mildly reduced ejection fraction, and HF with preserved ejection fraction were 50.9%, 15.3%, and 29.2%. Ischemic cardiomyopathy (CMP) was the most common etiology (32%), followed by tachycardia-induced CMP (12.8%) and idiopathic dilated CMP (9.5%). The prescription rate of angiotensin-converting enzyme inhibitor/angiotensin receptor blockers/angiotensin receptor/neprilysin inhibitor, beta-blockers, spironolactone, and sodium-glucose cotransporter-2 inhibitors at discharge were 76.8%, 66.5%, 50.0%, and 17.5%, respectively. The post-discharge 90-day mortality and readmission rates due to HF aggravation were 2.0% and 6.4%, respectively. Our analysis reveals the current state of acute HF in South Korea. Conclusions Our interim analysis provides valuable insights into the clinical characteristics, management, and early outcomes of acute HF patients in South Korea, highlighting the current state and treatment patterns in this population.