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Park, Soohyung,Lee, Wontae Elsevier 2018 Science of the Total Environment Vol.640 No.-
<P><B>Abstract</B></P> <P>This study investigated the removal of selected pharmaceuticals and personal care products (PPCPs) in a simulated managed aquifer recharge (MAR) system. The PPCPs included antibiotic, antiepileptic, antihypertensive, anti-inflammatory, and antilipidemic drugs, contrast media, herbicides, and stimulants. We first monitored the occurrence and fate of 22 PPCPs at a water reclamation facility (WRF) in Korea, and found carbamazepine and primidone were not readily removed (below 25% removal in average) by the WRF. This reclaimed water passed through a laboratory-scale soil column set-up at 0.5 m/d over one year, simulating MAR system. Atenolol, propranolol, and trimethoprim exhibited higher removal rates (>80%) than other PPCPs through the simulated MAR, while atrazine, carbamazepine, lincomycin, primidone, and sulfamethazine were not readily removed, exhibiting removal rates below 20%. It can be efficient to monitor and manage these recalcitrant compounds at MAR systems to improve water quality.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Per monitoring of 22 PPCPs at a WRF in Korea, 15 substances were detected. </LI> <LI> Atenolol, propranolol and trimethoprim were removed >80% through MAR. </LI> <LI> Atrazine, carbamazepine, lincomycin and primidone were not readily removed. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Korean vs. Western Exercise Capacity Nomograms for Korean Patients With Cardiovascular Disease
Park Soohyung,Battumur Byambakhand,Yoon Seo Yeon,Lee Yohan,Park Se hyun,Lee Kyuho,Back Seungmin,Lee Jieun,Kang Dong Oh,Choi Jah Yeon,Roh Seung-Young,Na Jin Oh,Choi Cheol Ung,Kim Jin Won,Rha Seung-Woon 대한의학회 2023 Journal of Korean medical science Vol.38 No.23
Background: Exercise capacity is known to be an independent predictor of cardiovascular events and mortality. However, most previous studies were based on Western populations. Further study is warranted for Asian patients according to ethnic or national standards. We aimed to compare prognostic values of Korean and Western nomograms for exercise capacity in Korean patients with cardiovascular disease (CVD). Methods: In this retrospective cohort study, we enrolled 1,178 patients (62 ± 11 years; 78% male) between June 2015 and May 2020, who were referred for cardiopulmonary exercise testing in our cardiac rehabilitation program. The median follow-up period was 1.6 years. Exercise capacity was measured in metabolic equivalents by direct gas exchange method during the treadmill test. The nomogram for exercise capacity from healthy Korean individuals and a previous landmark Western study was used to determine the percentage of predicted exercise capacity. The primary endpoint was the composite of major adverse cardiovascular events (MACE; all-cause death, myocardial infarction, repeat revascularization, stroke and hospitalization for heart failure). Results: A multivariate analysis showed that the risk of primary endpoint was more than double (hazard ratio [HR], 2.20; 95% confidence interval [CI], 1.10–4.40) in the patients with lower exercise capacity (< 85% of predicted) by Korean nomogram. The lower exercise capacity was one of the strong independent predictors along with left ventricular ejection fraction, age, and level of hemoglobin. However, the lower exercise capacity by Western nomogram could not predict the primary endpoint (HR, 1.33; 95% CI, 0.85–2.10). Conclusion: Korean patients with CVD with lower exercise capacity have higher risk of MACE. Considering inter-ethnic differences in cardiorespiratory fitness, the Korean nomogram provides more suitable reference values than the Western nomogram to determine lower exercise capacity and predict cardiovascular events in Korean patients with CVD.
Adsorption of acetaldehyde from air by activated carbon and carbon fibers
Soohyung Park,Muhammad Yaqub,Seunghan Lee,Wontae Lee 대한환경공학회 2022 Environmental Engineering Research Vol.27 No.2
The adsorption of acetaldehyde from air using various activated carbon and carbon fibers was investigated in this study. These adsorbents included activated carbon (AC), carbon fibers (CFs), activated carbon fibers (ACFs), and metal-coated carbon fibers (MCCFs) supplied by different manufacturers. AC was categorized as AC₁, AC₂, AC₃, and AC₄, CFs were denoted as ACF₁, while ACFs and MCCFs were expressed as ACF₂ and ACF₃, respectively. Five composite materials were prepared using the AC and ACFs in different ratios, and experiments were conducted to assess their acetaldehyde adsorption efficiency under dry and wet conditions. The results showed that the acetaldehyde adsorption efficiency of an impregnated AC₄ was higher (95.9%) than that of both non-impregnated AC₁ and AC₃ and an impregnated AC₂ after 1 min of operation. ACF₂ showed a higher acetaldehyde adsorption efficiency (50.9%) as compared to ACF₁ and ACF₃ because of its larger surface area and selective absorption capability after 1 min of operation. A composite material comprising 6.3 g of AC₄ and 1 g of ACF₂ showed the highest adsorption efficiency of 97.9% under dry conditions. However, this adsorption efficiency significantly decreased under wet conditions.
박수형(PARK Soohyung) 한국정치학회 2014 한국정치학회보 Vol.48 No.4
이 논문은 한국 정당이 대선후보 지명에서 ?국민경선제?란 이름의 개방형 후보선출제도를 도입한 원인과 과정을 정당체제의 제도 효과와 정치개혁 아이디어의 역할을 통해 분석한다. 후보선출은 정당의 핵심 기능이자 권한이다. 그런데 한국 정당은 대선후보 선거인단의 절반을 당과 무관한 일반 시민에게 할애하는 국민경선제를 도입했다. 왜 그리고 어떻게 이와 같은 제도변화가 이뤄졌는가? 이 논문이 제시하는 답은 다음과 같다. 한국의 지역1당체제는 계급·계층 균열에 기반한 정당 간 동원경쟁을 억압함으로써 정당조직 발전을 가로막고, 주요 정당 내 갈등 및 기존 정당과 신진 정치엘리트 간 갈등을 활성화함으로써 당내 소수파의 권력 이익에 부응하는 정당민주화 아이디어가 발전하는 조건을 낳았다. 그렇게 나타난 정당민주화 담론은 경제위기와 정권교체 상황에서 주요 정치사회집단들이 전개한 정치개혁 경쟁 속에 정치의 문제와 대안을 규정하는 지배담론으로 자리 잡았고, 이후 부패·비리 문제를 둘러 싼 정당 간 경쟁에서 파생된 당내 갈등이 국민경선제 도입으로 귀결되게 만들었다. This paper analyzes the change of presidential candidate selection method, focusing on the effects of party system and the roles of political reform ideas. Candidate selection is one of the most important functions and jurisdictions of political parties. Nevertheless, two major parties in Korea adopted the open type of candidate selection methods that permits non-party members to participate in choosing the presidential candidate in 2002. Why and how did this institutional change happen? The answers which the paper gives are as follows. The region-based one-party system hampered the development of party organization by suppressing class-based inter-party competition, and spread intra-party democracy ideas by activating the conflict between established parties and newcome political elites as well as the intra-party conflict. This ideas of intra-party democracy became the dominant discourses of political reform in the course of reform competition among leading groups in the economic and political crises in 1997~8. After all, this dominant ideas induced recurring intra-party conflicts to be resolved in the open type of presidential candidate methods.